JP2016142480A - Hot water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage type water heater capable of preventing freezing due to cold weather and performance deterioration, while securing heat insulation performance of a can body.SOLUTION: By providing a heat pump returning pipe 11 and the like on an outer peripheral part of a can body covering region 63b of a foamed heat insulation material 56 as objects to be heated, heating is actively performed by utilizing heat of a can body 2 leaking via the foamed heat insulation material 56 whose heat insulation performance is relatively low, and on the other hand, as for the can body 2, a region 62 other than one part of an exposed region 61 is covered by a vacuum heat insulation material 52. Thereby, freezing due to cold weather and the like can be prevented, while securing heat insulation performance of the can body 2.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a hot water storage type hot water supply apparatus that keeps an outer peripheral portion of a can body storing hot water for hot water supply with a heat insulating material.

  Conventionally, in this type of hot water storage type hot water supply apparatus, as described in Patent Document 1, there is one in which a vacuum heat insulating material is provided on the entire side surface of the can body.

JP 2008-292050 A

  Usually, the hot water storage type hot water supply apparatus is often provided outside a building such as a house or a building, and is often exposed to a severe cold climate especially in winter. In such a case, for example, it is preferable to take some freezing prevention measures for piping connected to the can body, and it is also preferable to take measures to prevent performance degradation and deterioration due to low temperatures for functional parts such as valves.

  Therefore, it is conceivable to arrange the piping and functional parts in the tank unit in the vicinity of the can body, and to prevent the freezing and the performance deterioration by utilizing the heat radiation of the can body. However, when a vacuum heat insulating material is provided on the entire side surface of the can body like the one described in Patent Document 1, the heat retaining performance of the can body can be improved, but heat dissipation from the can body is suppressed, so the tank unit The ambient temperature inside decreases. On the other hand, when the installation area of the vacuum heat insulating material is reduced in order to promote heat dissipation from the can body, the heat retaining performance of the can body is lowered. As described above, there is a problem that it is impossible to prevent the freezing of the piping and the performance deterioration of the functional parts due to the cold climate while ensuring the heat retaining performance of the can body.

  In order to solve the above-described problem, in claim 1 of the present invention, a hot water storage type hot water supply apparatus having a can body for storing hot water heated by a heating means and supplying the hot water discharged from the can body. A vacuum heat insulating material provided on the outer peripheral portion of the can body so as to cover the other region while leaving a part of the exposed region of the side surface of the can body, and the exposed region of the side surface of the can body A foam insulating material provided on an outer peripheral portion of the vacuum heat insulating material, covering the outer peripheral portion, and covering the outer peripheral portion of the exposed region of the can body among the foamed heat insulating material The object to be heated is provided on the outer periphery of the.

  Further, in claim 2, the can body covering region of the foam heat insulating material projects radially inward from other regions at a portion where the vacuum heat insulating material on the outer peripheral side of the side surface of the can body is not provided, It has a close contact convex portion that is in close contact with the side surface of the can body.

  Moreover, in Claim 3, the said heating target object is provided in the radial direction outer side of the said contact | adherence convex part in the said can body covering area | region.

  Moreover, in Claim 4, the said heating target object is arrange | positioned in the recessed part provided in the said outer peripheral part of the said can body covering area | region.

  According to a fifth aspect of the present invention, the heating object is a pipe or a functional component through the hot water supplied to the can body or water supply supplied to the can body.

  Further, in the present invention, the can body has a hot water discharge pipe for discharging the hot water connected to an upper end portion and a water supply pipe to which the water supply is introduced connected to a lower end portion, and the heating object is It is the said water supply pipe as said piping.

  According to the first aspect of the present invention, the heat insulating vacuum heat insulating material is provided on the radially outer peripheral portion of the substantially cylindrical can used for storing hot water therein, and further foamed on the radially outer peripheral portion thereof. Insulation is provided. At this time, the entire side surface of the can body is not covered with the vacuum heat insulating material, and a part is left as an exposed region, and the exposed region of the side surface of the can body is also foamed with the outer peripheral portion of the vacuum heat insulating material. It is covered with heat insulating material. That is, the outer peripheral part of the said exposed area | region of a can is covered only by the can body covering area | region of a foaming heat insulating material. And said piping, a valve, etc. are provided in the outer peripheral part of the said can body covering area | region as a heating target object. Here, the can body covering region is a region where there is no vacuum heat insulating material and only a foam heat insulating material having relatively low heat insulation performance (in other words, low heat insulating performance) is provided, so that the heat of the hot water in the can body is slightly It is a leak. Therefore, by providing the heating object on the outer periphery of the can body covering region, the leaking heat can be used to positively heat the object. On the other hand, about a can body, since area | regions other than an exposed area | region are covered with a vacuum heat insulating material, heat retention performance is securable. As a result, it is possible to reliably prevent freezing and performance degradation due to the cold climate while ensuring the heat retaining performance of the can body.

  According to the second aspect of the present invention, the heat of the hot water in the can body can be reliably received by the contact protrusion by bringing the contact protrusion of the can body covering region into close contact with the side surface of the can body.

  Moreover, according to Claim 3, the heat of the hot water in the can received by the contact | adherence convex part can be reliably transmitted to the heating target located in the outer peripheral part of a can body coating | coated area | region.

  According to the fourth aspect, the heat of the hot water in the can guided through the can covering region can be reliably transferred to the heating object located in the concave portion of the outer peripheral portion of the can covering region. At this time, by disposing the heating object in the recess, the heat transfer distance from the side surface of the can body to the heating object is shortened, and the heating effect can be enhanced. In addition, there is also an effect that the heating object is stably positioned in the can-covering region and reliable heating can be performed.

  Further, according to the fifth aspect, it is possible to reliably prevent freezing by making the piping an object to be heated, and it is also possible to reliably prevent performance degradation and deterioration due to low temperature for functional parts such as valves. .

  According to the sixth aspect of the present invention, the hot water discharge pipe for discharging hot water in the can body is connected to the upper end of the can body, and hot water from the hot water discharge pipe is supplied to a hot water supply destination such as a bathtub or a hot water tap. . On the other hand, a water supply pipe for supplying water to the can body is connected to the lower end portion of the can body, and water supply to the can body is performed via the water supply pipe in response to the hot water supply. As a result, since relatively low-temperature water flows inside the water supply pipe, freezing is particularly likely to occur under conditions of the cold climate. According to the sixth aspect, by using such a water supply pipe as the heating object, the freezing can be particularly effectively prevented.

1 is an overall schematic configuration diagram of a hot water storage type hot water supply apparatus according to an embodiment of the present invention. An exploded perspective view showing details of the heat insulating material provided on the outer periphery of the can body Perspective view showing details of piping and functional parts provided on outer periphery of foam insulation Schematic side view showing the recess structure formed in the foam insulation Schematic cross-sectional view taken along line VV in FIG. 4 is a schematic cross-sectional view taken along the line VI-VI in FIG. Schematic longitudinal cross-sectional view by VII-VII cross section in FIG. Schematic longitudinal sectional view by VIII-VIII section in FIG. An exploded perspective view showing details of the heat insulating material provided on the outer peripheral portion of the can body in the modified example in which the functional component is the heating object. Schematic cross-sectional view of a modified example in which no close contact convex part is provided The exploded perspective view showing the detail of the heat insulating material provided in the outer peripheral part of the can in the modification which has a protrusion in a can body side surface

  Next, an embodiment of the present invention will be described with reference to FIGS.

  An overall schematic configuration of the hot water storage type hot water supply apparatus of the present embodiment is shown in FIG. In FIG. 1, this hot water storage type hot water supply apparatus 100 is a device for boiling hot water and storing hot water in the midnight hours when the unit price of contracted electric power by time zone is low, and using the hot water stored in the hot water for hot water supply. A hot water storage tank unit 1 provided with a body 2 (hot water storage tank), a heat pump unit 3 as a heating means for heating hot water in the can body 2, a hot water tap 4 provided in a kitchen, a washroom, etc., for example, hot water supply It has a hot water remote controller 5 provided in the vicinity of the stopper 4, a bathtub 6, and a bathroom remote controller 7 provided in, for example, a bathroom.

  The hot water storage tank unit 1 includes a can body 2 installed inside an exterior case (not shown) serving as a casing. The can body 2 has a hot water discharge pipe 8 connected to the upper end, a water supply pipe 9 connected to the lower end, a heatpone forward pipe 10 constituting a heatpone circulation circuit connected to the lower part, and a heatpone return constituting the heatpone circulation circuit upper part. A tube 11 is connected. The hot water in the can body 2 taken out through the heat pump forward pipe 10 is boiled up by the heat pump unit 3 and then returned from the heat pump return pipe 11 into the can body 2 and stored therein. Further, hot water in the can body 2 is pushed up by the water supply from the water supply pipe 9 so that the high-temperature water in the upper part of the can body 2 is pushed out from the hot water discharge pipe 8 and hot water is supplied. At this time, the water supply pipe 9 is provided with a pressure reducing valve 46 for reducing the pressure of the water supply, and a water supply temperature sensor 49 for detecting the temperature of the water supply, and the hot water pipe 8 is provided with the overpressure of the can body 2. An overpressure relief valve 45 is provided. Note that a heat insulating material for heat insulation is provided on the outer peripheral portion of the can body 2 (not shown in FIG. 1 for the purpose of preventing complication), which will be described in detail later.

  The can body 2 is provided with a plurality of hot water storage temperature sensors 39 along the vertical direction. In the present embodiment, five hot water storage temperature sensors 39a, 39b, 39c, 39d, and 39e are arranged from the top to the bottom, and the inside of the can 2 is determined by the temperature information detected by these hot water storage temperature sensors 39a to 39d. The amount of heat remaining in the can body 2 is detected, and the temperature distribution in the vertical direction in the can body 2 is further detected.

  The heat pump unit 3 includes a heat pump circuit 16, a heat pump circulation pump 17, and a heat pump control unit 18 that controls driving thereof. The heat pump circuit 16 includes a compressor 12, a refrigerant-water heat exchanger 13 as a condenser, an electronic expansion valve 14, and a forced air-cooled evaporator 15. The heat pump circulation pump 17 circulates hot water in the can 2 into the refrigerant-water heat exchanger 13 through the heat pump forward pipe 10 and the heat pump return pipe 11.

  Carbon dioxide is used as a refrigerant in the heat pump circuit 16 to constitute a supercritical heat pump cycle. In general, in the supercritical heat pump cycle, the refrigerant is condensed in a supercritical state during heat exchange, but in the refrigerant-water heat exchanger 13, the refrigerant and hot water in the can body 2 that is heated water flow opposite to each other. The counter flow system is employed, whereby heated water can be efficiently heated to a high temperature. For example, low-temperature water can be boiled to a high temperature of about 90 ° C. without an electric heater.

  The heat pump control unit 18 is configured to control the electronic expansion valve so that a temperature difference between the inlet temperature of the refrigerant-water heat exchanger 13 and the outlet temperature of the refrigerant-water heat exchanger 13 is constant. 14 or the compressor 12 is controlled. Thereby, especially when the inlet temperature of the refrigerant-water heat exchanger 13 of the water to be heated is a low temperature of about 5 to 20 ° C., for example, the water to be heated is heated with a very good COP (energy consumption efficiency). can do.

  On the other hand, in the can body 2, a heat exchanger 19 made of, for example, a stainless steel tube is provided for heating the hot water in the bathtub 6. The heat exchanger 19 is connected to a bath return pipe 20 and a bath return pipe 22 equipped with a bath circulation pump 21 so that hot water in the bathtub 6 can be circulated. That is, the hot water in the bathtub 6 guided through the bath return pipe 22 is heated by the high-temperature water in the can 2 in the heat exchanger 19 and then returned to the bath 6 through the bath pipe 20. Insulation or chasing is performed. The bath return pipe 22 is provided with a bath temperature sensor 23 for detecting the temperature of hot water in the circulating bathtub 6.

  Further, an intermediate tap pipe 24 is connected to an intermediate position of the can body 2 (not limited to a substantially central position in the vertical direction). The intermediate hot water discharge pipe 24 is medium-temperature water whose temperature has been lowered by exchanging heat with hot water from the bathtub 6 in the heat exchanger 19, intermediate-temperature water whose temperature has been lowered (or increased in temperature) in the vicinity of the boundary layer of hot water and water, etc. The hot water stored in the intermediate position of the can body 2 (not limited to the substantially central position in the vertical direction) is discharged from the can body 2.

  Furthermore, the intermediate hot water led from the vicinity of the intermediate position of the can body 2 through the intermediate hot water pipe 24 and the upper end of the can body 2 are connected to the downstream side joining position of the intermediate hot water pipe 24 and the hot water pipe 8. An intermediate mixing valve 25 composed of an electric mixing valve that mixes high temperature water guided through the hot water discharge pipe 8 is provided. An intermediate hot water supply pipe 27 is connected to the downstream side of the intermediate mixing valve 25, and an intermediate temperature sensor 26 is provided. The mixing ratio of the medium temperature water and the high temperature water in the intermediate mixing valve 25 is such that the hot water temperature detected by the intermediate temperature sensor 26 is higher by a predetermined temperature than the set hot water temperature set by the user using the hot water remote controller 5 or the bath remote controller 7. The target temperature is controlled.

  Further, at the downstream side joining position of the intermediate hot water supply pipe 27 and the water supply bypass pipe 29 branched from the water supply pipe 9, the hot water led from the intermediate mixing valve 25 through the intermediate hot water supply pipe 27 and the water supply bypass pipe 29 are connected. A hot water supply mixing valve 28 composed of an electric mixing valve that mixes the low-temperature water introduced is provided. A hot water supply pipe 30 is connected to the downstream side of the hot water supply mixing valve 28, and a hot water supply temperature sensor 31 is provided. The mixing ratio of the hot water and the low temperature water in the hot water mixing valve 28 is controlled so that the hot water temperature detected by the hot water temperature sensor 31 becomes the hot water set temperature set by the user with the hot water remote controller 5 or the bath remote controller 7. The hot water supply pipe 30 is further provided with a hot water supply flow rate counter 47 for counting the amount of hot water to be supplied.

  In addition, hot water guided through the branch intermediate hot water pipe 33 is located at the downstream junction of the branch intermediate hot water pipe 33 branched from the intermediate hot water pipe 27 and the branch water supply bypass pipe 34 branched from the water supply pipe 9. A bath mixing valve 32 composed of an electric mixing valve for mixing low temperature water led from the branch water supply bypass pipe 34 is provided. A hot water filling pipe 35 communicating with the bath return pipe 22 is connected to the downstream side of the bath mixing valve 32, and a hot water temperature sensor 36 is provided. The mixing ratio of the hot water and the low temperature water in the bath mixing valve 32 is controlled so that the hot water temperature detected by the hot water temperature sensor 36 becomes the bath set temperature set by the user with the hot water remote controller 5 or the bath remote controller 7. . In addition, a hot water filling valve 37 for starting / stopping hot water filling to the bathtub 6, a bath flow counter 38 for counting the amount of hot water filling to the bathtub 6, and hot water in the bathtub 6 flow backward in the hot water filling pipe 35. A double check valve 48 is provided to prevent this.

  The hot water remote controller 5 and the bath remote controller 7 include a hot water temperature setting switch 40 for setting a hot water set temperature, a bath temperature setting switch 41 for setting a bath set temperature, and hot water of the bath remote control 7 for filling the bath set temperature. There is provided a bath automatic switch 42 that fills the bathtub 6 by the amount of hot water set by an amount setting switch (not shown) and keeps the temperature for a predetermined time.

  A hot water supply control unit 44 is connected to the hot water remote controller 5 and the bath remote controller 7 by wireless communication or wired communication. The hot water supply control unit 44 receives inputs from the sensors (the hot water storage temperature sensors 39a to 39e, the bath temperature sensor 23, the intermediate temperature sensor 26, the hot water supply temperature sensor 31, the hot water temperature sensor 36, etc.) in the hot water storage tank unit 1. It has a microcomputer for controlling the drive of each actuator (the intermediate mixing valve 25, which is an electric mixing valve, the hot water supply mixing valve 28, the actuator of the bath mixing valve 32, the actuator of the hot water filling valve 37, etc.). The hot water supply set temperature and the bath set temperature arbitrarily set by the user on the remote controller 7 are realized by driving the actuators. Specifically, the hot water supply control unit 44 detects the intermediate mixing valve 25 so that the temperature detected by the intermediate temperature sensor 26 becomes a mixing target temperature that is a predetermined temperature higher than the higher one of the hot water supply set temperature and the bath set temperature. The valve opening of the hot water supply mixing valve 28 is feedback controlled so that the temperature detected by the hot water supply temperature sensor 31 becomes the set temperature of the hot water supply, and further, detected by the hot water temperature sensor 36. The valve opening of the bath mixing valve 32 is feedback-controlled so that the temperature becomes the bath setting temperature.

  Next, the detail of the said heat insulating material provided in the outer peripheral part of the can 2 is demonstrated using FIG. In addition, in order to avoid the complication of illustration, illustration of various piping connected to the can 2 and the said exterior case is abbreviate | omitted. In FIG. 2, the can body 2 is a metal hollow can which is formed in a substantially cylindrical shape as a whole, and two vacuum heat insulating materials 52 covering a part of the side surface of the can body 2 over almost the entire periphery thereof. And four foam heat insulating materials 53, 54, 55, and 56 covering the entire can body 2 including the vacuum heat insulating material 52, and a base on which the can body 2 covered with the foam heat insulating materials 53 to 56 is placed. Part 57 is provided.

  The vacuum heat insulating material 52 is, for example, a structure in which a glass wool is filled as a core material in a bag body of an aluminum film and is almost in a vacuum state. For example, a flat heat insulating material base material is rolled. As a result, the whole is formed in a substantially semi-cylindrical shape (substantially arcuate cross section). In the illustrated example, two vacuum heat insulating materials 52 are provided on the cylindrical side surface 60 so as to sandwich the can body 2 therebetween.

  The two vacuum heat insulating materials 52 are provided on the outer peripheral portion of the can body 2 so as to cover the other region 62 while leaving a part of the exposed region 61 (exposed regions 61a and 61b) of the side surface 60 of the can body 2. Provided. Specifically, each of the two vacuum heat insulating materials 52 is formed so that the vertical dimension is smaller than the vertical dimension of the side surface 60 of the can body 2 by a predetermined amount, and closer to the upper end side of the side surface 60. Is arranged. Thereby, while covering the upper part of the can body 2 where hot water of relatively high temperature is stored with the vacuum heat insulating material 52, the relatively expensive vacuum heat insulating material 52 is saved, and the necessary heat retaining function is saved while saving economical waste. Can be secured. As a result, the lower end region of the side surface 60 of the can body 2 is the exposed region 61 a that is not covered by the vacuum heat insulating material 52.

  Further, the two vacuum heat insulating materials 52 are formed such that the sum of the dimensions in the circumferential direction is smaller than the circumferential dimension of the can body 2 by a predetermined amount. As a result, when two vacuum heat insulating materials 52 are provided on the outer peripheral portion of the can 2, a gap is formed between the circumferential end portions of the vacuum heat insulating material 52. In the present embodiment, as shown in FIG. 5 described later, the circumferential ends of the two vacuum heat insulating materials 52 on one side in the circumferential direction (upper side in FIG. 5 described later) of the side surface 60 of the can body 2. The vacuum heat insulating materials 52 are arranged so that the portions are in contact with each other and a gap is formed between the circumferential end portions of the two vacuum heat insulating materials 52 on the other circumferential side (the lower side in FIG. 5 described later). The As a result, the region corresponding to the gap in the side surface 60 of the can body 2 is the exposed region 61b that is not covered by the vacuum heat insulating material 52.

  Of the four foamed heat insulating materials 53, 54, 55, 56, two foamed heat insulating materials 55, 56 cover two outer peripheral portions of the exposed regions 61a, 61b of the side surface 60 of the can body 2 Provided on the outer periphery of the vacuum heat insulating material 52. Below, among these foam heat insulating materials 55 and 56, the area | region which covers the outer peripheral part of the said exposed area | regions 61a and 61b of the can body 2 is called the can body covering area | region 63, and the area | region which covers the outer peripheral part of the vacuum heat insulating material 52 is heat-insulated. The material covering region 64 is assumed. Of the can body covering region 63, a region covering the outer periphery of the exposed region 61a is a can body covering region 63a, and a region covering the outer periphery of the exposed region 61b is a can body covering region 63b (see FIG. 4 described later). Let's say.

  As shown in FIG. 2, the can body covering region 63 a of the foam heat insulating material 55 is formed thicker than the heat insulating material covering region 64. The difference in thickness between the can body covering region 63 a and the heat insulating material covering region 64 is substantially equal to the thickness of the vacuum heat insulating material 52. As a result, the inner peripheral surface of the can body covering region 63a of the foam heat insulating material 55 is radially inward of the outer peripheral side of the side surface 60 of the can body 2 in the region where the vacuum heat insulating material 52 is not provided. A close contact convex portion 65 is formed that protrudes in contact with the exposed region 61 a of the side surface 60 of the can body 2. Note that the close contact convex portion 65 does not need to be completely in close contact with the exposed region 61a of the side surface 60, and only part of the close contact convex portion 65 may be in close contact (contact).

  The foam heat insulating material 56 has the same configuration as the foam heat insulating material 55, and the exposed region 61 a of the side surface 60 of the can body 2 is formed on the inner peripheral surface of the can body covering region 63 a (see FIG. 4 described later). A close contact convex portion 65 (see FIG. 4 to be described later) is formed. Further, on the inner peripheral surface of the can body covering region 63b of the foam heat insulating material 56, the close contact convex portion 66 (located on the upper portion of the close contact convex portion 65 and in close contact with the exposed region 61b of the side surface 60 of the can body 2). (See FIGS. 4 and 5 to be described later). The close contact convex portion 66 is formed in a substantially straight shape along the vertical direction, and protrudes into a gap between the circumferential end portions of the two vacuum heat insulating materials 52 (substantially rectangular in cross section). have. In addition, the said contact convex part 66 does not need to be completely_contact | adhered to the said exposed area | region 61b of the side surface 60 similarly to the said contact convex part 65, The part should just be contact | adhered (contact).

  A plurality of recesses 67, 68, 69, 70, etc. are formed on the outer periphery of the can body covering regions 63 a, 63 b of the foam heat insulating material 56. The concave portion 67 is formed in a substantially linear groove shape along the vertical direction in the outer peripheral portion of the can body covering region 63a. Further, the concave portion 68 is formed in a substantially linear groove shape along the vertical direction in the outer peripheral portion of the can body covering region 63b. The concave portion 69 is formed in a substantially linear groove shape along the vertical direction at a position close to the concave portion 68 in the circumferential direction on the outer peripheral portion of the can body covering region 63a. The concave portion 68 and the concave portion 69 are formed so that their circumferential positions are slightly different and substantially parallel to each other, and the lower end portion of the concave portion 68 and the upper end portion of the concave portion 69 are groove-shaped along the circumferential direction. Are communicated by a recess 70 formed in

  Next, the details of the piping and functional parts provided on the outer periphery of the foam heat insulating materials 53 to 56 will be described with reference to FIG. In addition, in order to avoid the complexity of illustration, illustration of the said exterior case etc. is abbreviate | omitted. As shown in FIG. 3, various components such as various pipes and valves connected to the can body 2 are collectively arranged on the outer peripheral side of the can body 2 on the foam heat insulating material 56 side. Thereby, while being able to reduce the installation space of the hot water storage tank unit 1, the maintainability can be improved. An arrangement table 71 is installed below the outer peripheral side of the can body 2 on the foamed heat insulating material 56 side. The arrangement table 71 is fixed to, for example, an exterior case (not shown), and a plurality of instruments such as various pipe connectors are arranged on the arrangement table 71.

  One end of the heat pump forward tube 10 is connected to a connector 72 arranged on the arrangement table 71, and the other end is inserted into the foam heat insulating material 54 and connected to the lower end of the can body 2. In the example shown in FIG. 3, a pipe heat insulating material 10 a is attached to a part of the heat-pump forward pipe 10. One end of the heat-pump return pipe 11 is inserted into the foam heat insulating material 53 and connected to the upper end of the can body 2, and the other end is connected to the connection tool 83 via a valve device 73 disposed on the placement table 71. It is connected. In the example shown in FIG. 3, a pipe heat insulating material 11 a is attached to a part of the heat-pump return pipe 11.

  One end of the hot water pipe 8 is inserted into the foam heat insulating material 53 and connected to the upper end of the can body 2, and the other end is connected to the intermediate mixing valve 25 arranged above the arrangement table 71. In the example shown in FIG. 3, a pipe heat insulating material 8 a is attached to a part of the hot water discharge pipe 8. The hot water discharge pipe 8 is provided with the overpressure relief valve 45, and one end of a drain hose 74 having the other end connected to the base portion 57 is connected to the overpressure relief valve 45. One end of the intermediate tap pipe 24 is inserted into an opening 75 formed in the foam heat insulating material 56 and connected to an intermediate position of the can body 2, and the other end is connected to the intermediate mixing valve 25. In the example shown in FIG. 3, a pipe heat insulating material 24 a is attached to almost all of the intermediate tap pipe 24.

  The hot water mixing valve 28 is provided below the intermediate mixing valve 25, and the intermediate mixing valve 25 and the hot water mixing valve 28 are connected by the intermediate hot water pipe 27. The branched intermediate hot water supply pipe 33 branched from the intermediate hot water supply pipe 27 is connected to a bath mixing valve 32 disposed on the radially inner side (foaming heat insulating material 56 side) of the hot water supply mixing valve 28. The water supply pipe 9 is erected below the hot water supply mixing valve 28, one end of the water supply pipe 9 is connected to the hot water supply mixing valve 28 via the water supply bypass pipe 29, and the other end is connected via the pressure reducing valve 46. And connected to a connector 76 arranged on the arrangement table 71. The hot water supply pipe 30 is erected next to the water supply pipe 9, one end of the hot water supply pipe 30 is connected to the hot water supply mixing valve 28, and the other end is connected to a connector 77 arranged on the arrangement table 71. Has been. In the example shown in FIG. 3, a pipe heat insulating material 30 a is attached to a part of the hot water supply pipe 30.

  The water supply pipe 9 branched from the water supply pipe 9 via the branch pipe 78 is drawn out radially inward (foam insulation material 56 side) and extended downward, and the tip is inserted into the foam insulation material 54. And connected to the lower end of the can body 2. In the example shown in FIG. 3, a pipe heat insulating material 9 a is attached to a part of the branched water supply pipe 9.

  One end of the bath return pipe 22 is inserted into the foam insulation 53 and connected to the heat exchanger 19 inside the can body 2, and the other end is placed on the three-way valve 79 and the arrangement table 71. It is connected to a connector 80 arranged on the arrangement table 71 via the pump 21. Further, one end of the flow-out pipe 20 is inserted into an opening 81 formed in the foam heat insulating material 53 and connected to the heat exchanger 19 inside the can body 2, and the other end is arranged on the arrangement table 71. Connected to the connected connector 82.

  In the hot water storage type hot water supply apparatus 100 having the above basic configuration, the vacuum heat insulating material 52 for heat insulation is provided on the radially outer peripheral portion of the substantially cylindrical can body 2 used for storing hot water therein, Furthermore, the said foam heat insulating materials 53-56 are provided in the radial direction outer peripheral part. Here, the vacuum heat insulating material has a very high heat retaining performance but is expensive, while the foam heat insulating material has a low heat retaining performance but is inexpensive. In general, the vacuum heat insulating material is difficult to process and deform, and it is difficult to cope with the unevenness or protrusions on the can body. Further, as described above, since relatively hot water is stored in the upper portion of the can body 2, covering the upper portion of the can body 2 can ensure a necessary heat retaining function while saving economical waste. From these viewpoints, in the present embodiment, the entire side surface 60 of the can body 2 is not covered with the vacuum heat insulating material 52 but a part is left as the exposed region 61, and the exposed region 61 of the can body side surface 60 is The outer peripheral portion of the vacuum heat insulating material 52 is covered with the foam heat insulating materials 55 and 56. That is, the outer peripheral portion of the exposed region 61 of the can body 2 is covered only by the can body covering region 63 of the foam heat insulating materials 55 and 56.

  On the other hand, the hot water storage type hot water supply apparatus 100 is usually provided outside a building such as a house or a building, and is often exposed to a severe cold climate especially in winter. In such a case, if the pipe connected to the can body 2 freezes, there is a concern about damage to the pipe due to freezing and expansion of internal water. Therefore, it is preferable to take some freezing prevention measures for the pipe. .

  Therefore, in the present embodiment, a part of the various pipes is provided on the outer peripheral portions of the can body covering regions 63a and 63b that cover the outer peripheral portions of the exposed regions 61a and 61b of the can body 2 in the foam heat insulating material 56. It is provided as a heating object to be heated using heat radiation from the can body 2. In the present embodiment, among the various pipes, the water supply pipe 9 that is a pipe through which the water supplied to the can body 2 is passed, the heat pump forward pipe 10, and the heat pump return pipe through which the hot water supplied to the can body 2 is passed. 11 is the heating object.

  Next, with reference to FIGS. 4 to 8, the installation structure of the water supply pipe 9, the heaton forward pipe 10, and the heaton return pipe 11 will be described. In FIG. 4, in order to avoid the complexity of the illustration, the concave portions 67 related to the installation of the foam heat insulating materials 53, 54, various pipes, the water supply pipe 9, the heaton forward pipe 10, and the heaton return pipe 11. About the uneven | corrugated structure of the foam heat insulating material 56 other than -70, illustration is abbreviate | omitted.

  As shown in FIGS. 4, 5, and 7, the can body covering region 63 b of the foam heat insulating material 56 includes the contact protrusion 66 on the inner peripheral surface thereof. The heat pump return pipe 11 is provided on the radially outer side of the close contact convex portion 66 in the can body covering region 63b. More specifically, the heat-pong return pipe 11 is disposed in a recess 68 provided on the outer periphery of the can body covering region 63b. As shown in FIG. 5, the recess 68 is formed, for example, so that the cross-sectional shape is a substantially arc shape, and is formed to a depth that accommodates, for example, about half of the pipe heat insulating material 11 a of the heat-pump return pipe 11. . The heat-pump return pipe 11 is arranged so that the pipe heat insulating material 11 a contacts the inner peripheral surface of the recess 68.

  The portion where the pipe heat insulating material 11a of the heat-pump return pipe 11 is not attached, that is, the heat-pump return pipe 11 may be arranged bare in the concave portion 68, but the heat-pone return pipe 11 of the heat-pone return pipe 11 is disposed as in this embodiment. By arranging the mounting portion of the pipe heat insulating material 11a in the recess 68, the heat insulating effect of the pipe can be further enhanced.

  As shown in FIGS. 4, 6, and 8, the can body covering region 63 a of the foam heat insulating material 56 includes the contact protrusion 65 on the inner peripheral surface thereof. And the said water supply pipe | tube 9 is provided in the radial direction outer side of the contact | adherence convex part 65 in the can body covering area | region 63a. More specifically, the water supply pipe 9 is disposed in a recess 67 provided in the outer peripheral portion of the can body covering region 63a. As shown in FIG. 6, the recessed part 67 is formed, for example so that a cross-sectional shape may become a substantially circular arc shape, and is formed in the depth in which the said piping heat insulating material 9a of the water supply pipe 9 is accommodated, for example, about half. The water supply pipe 9 is arranged so that the pipe heat insulating material 9 a contacts the inner peripheral surface of the recess 67.

  Similarly, as shown in FIG. 4 and FIG. 6, the heat-feeding forward tube 10 is provided in the recess 69 provided on the outer side in the radial direction of the close contact convex portion 65 in the can body covering region 63a, that is, on the outer peripheral portion of the can body covering region 63a. Is arranged. As shown in FIG. 6, the recess 69 is formed, for example, so that the cross-sectional shape is a substantially arc shape, and is formed to a depth that accommodates, for example, about half of the pipe heat insulating material 10 a of the heat pump forward tube 10. . The heat-pump forward tube 10 is disposed so that the pipe heat insulating material 10 a contacts the inner peripheral surface of the recess 69.

  The recesses 67 and 69 may be provided with portions of the water supply pipe 9 and the heat-pump forward pipe 10 where the pipe heat insulating materials 9a and 10a are not mounted, but inside the water supply pipe 9 and the heat-pump forward pipe 10 Since relatively low-temperature water flows and freezing is particularly likely to occur, as shown in this embodiment, by arranging the mounting portions of the pipe heat insulating materials 9a and 10a in the recesses 67 and 69, the heat insulating effect of the pipe can be obtained. It can be further increased.

  As described above, according to the hot water storage type hot water supply apparatus 100 of the present embodiment, the can body of the foam heat insulating material 56 with the water supply pipe 9, the heat pump forward pipe 10, and the heat pump return pipe 11 as heating objects. It is provided on the outer periphery of the covering regions 63a and 63b. As described above, the can body covering regions 63a and 63b are regions in which the vacuum heat insulating material 52 is not provided and only the foam heat insulating material 56 having a relatively low heat retaining performance (in other words, low heat insulating performance) is provided. Heat from the hot water in the body 2 leaks slightly. Therefore, by providing the water supply pipe 9, the heat-pump forward pipe 10, and the heat-pone return pipe 11 on the outer periphery of the can body covering regions 63a and 63b, the heat that leaks out is actively heated. Can do. On the other hand, about the can 2, since the area | region 62 other than some exposed areas 61 is covered with the vacuum heat insulating material 52, heat retention performance is securable. As a result, it is possible to reliably prevent freezing or the like due to the cold climate while ensuring the heat retaining performance of the can body 2.

  In the present embodiment, in particular, the can body covering regions 63a and 63b of the foam heat insulating material 56 are located on the outer peripheral side of the side surface 60 of the can body 2 in a region where the vacuum heat insulating material 52 is not provided. Also projecting inward in the radial direction and provided with the contact convex portions 65 and 66 that are in close contact with the side surface 60 of the can body 2. In this way, the close contact convex portion 65 of the can body covering region 63a and the close contact convex portion 66 of the can body covering region 63b are brought into close contact with the side surface 60 of the can body 2 to ensure close contact with the heat of the hot water in the can body 2. The projections 65 and 66 can receive heat.

  In the present embodiment, in particular, the water supply pipe 9, the heat pump forward pipe 10, and the heat pump return pipe 11 as heating objects are provided on the radially outer side of the close contact convex portions 65 and 66 in the can body covering regions 63 a and 63 b. It has been. Thereby, the heat of the hot water in the can body 2 received by the close contact convex portions 65 and 66 is supplied to the water supply pipe 9, the heat pump forward pipe 10, and the heat pump return pipe 11 located in the outer peripheral portion of the can body covering regions 63 a and 63 b. Heat can be reliably transferred.

  In the present embodiment, in particular, the water supply pipe 9, the heat pump forward pipe 10, and the heat pump return pipe 11 as heating objects are provided in the concave portions 67, 69, 68 provided on the outer peripheral portions of the can body covering regions 63 a, 63 b. Deploy. Thereby, the heat of the hot water in the can body 2 guided through the can body covering regions 63a and 63b is supplied to the water supply pipes 9 and the heat pumps located in the recesses 67, 69 and 68 on the outer peripheral portions of the can body covering regions 63a and 63b. Heat can be reliably transferred to the tube 10 and the heat-pump return tube 11. At this time, by disposing the water supply pipe 9 and the like in the recesses 67 to 69, the heat transfer distance from the can side surface 60 to the water supply pipe 9 and the like is shortened, and the heating effect can be enhanced. In addition, there is an effect that the water supply pipe 9 and the like can be positioned stably in the can body covering regions 63a and 63b and reliable heating can be performed.

  In the present embodiment, in particular, the object to be heated is a hot water supplied to the can body 2 or a pipe through which water is supplied to the can body 2. Thus, freezing prevention can be reliably achieved by making piping into a heating target object.

  In the present embodiment, in particular, the hot water discharge pipe 8 for discharging hot water in the can body 2 is connected to the upper end of the can body 2, and the hot water supply destination such as the bathtub 6 and the hot water tap 4 is connected to the hot water supply destination from the hot water discharge pipe 8. Hot water is supplied. On the other hand, a water supply pipe 9 for supplying water to the can body 2 is connected to the lower end portion of the can body 2, and water supply into the can body 2 through the water supply pipe 9 corresponds to the hot water supply. Is done. As a result, since relatively low-temperature water flows inside the water supply pipe 9, freezing is particularly likely to occur under the cold climate conditions. Therefore, by using such a water supply pipe 9 as an object to be heated, the freezing can be particularly effectively prevented.

  In the present embodiment, in particular, the lower end region of the side surface 60 of the can body 2 is the exposed region 61 a that is not covered with the vacuum heat insulating material 52. Here, the hot water storage type hot water supply apparatus 100 of the present embodiment boils hot water at midnight and stores hot water sequentially from the upper part of the can body 2, so the morning (dawn) time when freezing is most likely to occur. The hot water reaches the exposed area 61a in the belt, and the water supply pipe 9 and the heat-pump forward pipe 10 which are heating objects can be heated. Therefore, the freezing can be prevented particularly effectively.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not change the summary of invention. For example, in the above embodiment, the case where the heating target is a pipe has been described as an example, but the present invention is not limited to this. The heating object may be a functional component such as an electric mixing valve. Since such a valve is generally molded from a resin, there is a concern about damage due to freezing and expansion of internal water, as in the case of the pipe described above. Moreover, even if it does not occur until the breakage occurs, there is a concern that the operation of the valve may malfunction due to freezing of the internal water, leading to a decrease in performance or deterioration. Therefore, it is preferable to take some freezing prevention measures for the functional parts.

  In this case, for example, as shown in FIG. 9 corresponding to FIG. 2, one of the two vacuum heat insulating materials 52 is constituted by a plurality of vacuum heat insulating materials 52a, 52b, 52c, and each of the vacuum heat insulating materials 52a, 52b, 52c The shape and size of the exposed region 61 of the can body 2 may be adjusted by adjusting the shape and size. In the example shown in FIG. 9, the exposed region 61c is formed by reducing the vertical dimension of the vacuum heat insulating material 52b, and the can body covering region 63c of the foam heat insulating material 56 covering the outer periphery of the exposed region 61c ( A functional component is provided on the outer peripheral portion (not shown).

  Specifically, recesses 84 and 85 are formed in the outer peripheral portion of the can body covering region 63c of the foam heat insulating material 56, and at least a part of the bath mixing valve 32 as a functional component is formed in the recess 84. Arranged inside, at least a part of the three-way valve 79 as a functional component is arranged in the recess 85. In addition, the can body covering region 63c of the foam heat insulating material 56 includes a close contact convex portion 86 (not shown) that is in close contact with the exposed region 61c of the side surface 60 of the can body 2 on its inner peripheral surface.

  In this case, in addition to the effects of the above-described embodiment, functional parts such as valves can also be prevented from being damaged due to freezing, deterioration in performance, deterioration, and the like.

  Moreover, in the said embodiment, although the case where the can body covering area | region 63b of the foam heat insulating material 56 was equipped with the contact | adherence convex part 66 was demonstrated as an example, it is not restricted to this. For example, as shown in FIG. 10 corresponding to FIG. 5, the can body covering region 63 b of the foam heat insulating material 56 does not have the close contact convex portion 66, and the air is formed in the gap between the circumferential end portions of the two vacuum heat insulating materials 52. A layer 87 may be formed. Although not shown, the can body covering region 63 a of the foam heat insulating materials 55 and 56 does not include the close contact convex portion 65, and the space between the can body covering region 63 a of the foam heat insulating materials 55 and 56 and the can body side surface 60. An air layer may be formed. In this case, since the heat transfer property of the heat of the can body 2 to the heating object can be improved as compared with the case where the close contact convex portion 66 and the like are provided, the freeze prevention effect can be further enhanced.

  Moreover, in the said embodiment, although the case where there was no unevenness | corrugation and protrusion in the side surface 60 of the can 2 was demonstrated as an example, it is not restricted to this. For example, as shown in FIG. 11 corresponding to FIG. 2, when there is a projection (in this example, the connection port 88 of the intermediate tap pipe 24) on the side surface 60 of the can body 2, the vacuum heat insulating material is used as described above. Since it is difficult to process and deform, the two vacuum heat insulating materials 52 may be arranged so that the position of the connection port 88 is the exposed region 61b. In this case, it is possible to obtain the same effects as those of the above-described embodiment and the like by disposing a heating object such as the pipe and the functional component at a circumferential position corresponding to the connection port 88.

  Moreover, although the said embodiment demonstrated as an example the case where the heat exchanger 19 was the internal heat exchange system installed in the can 2 inside, it is not restricted to this. That is, an external heat exchange heat exchanger in which hot water in the tank and bathtub water exchange heat outside the can 2 may be used.

  Moreover, although the said embodiment demonstrated as an example the case where a heating means was comprised with the heat pump unit 3, it is not restricted to this. That is, a hot water heater using solar heat, gas or liquid fuel, an electric water heater using an electric heater, a waste heat recovery device of a cogeneration system, or the like may be used as the heating means.

2 Can body 3 Heat pump unit (heating means)
8 Hot water pipe 9 Water supply pipe (heating object, piping)
10 Heaton Outward Pipe (Heating object, piping)
11 Heaton return pipe (heating object, piping)
32 bath mixing valve (heating object, functional parts)
52 Vacuum heat insulating material 55, 56 Foam heat insulating material 60 Side surface 61a to 61c Exposed region 62 region 63a to 63c Can body covering region 65 Adhering convex part 66 Adhering convex part 67 to 69 Concave part 79 Three-way valve (object to be heated, functional component)
86 Adhesion convex part 100 Hot water storage type hot water supply device

Claims (6)

In a hot water storage type hot water supply apparatus having a can body for storing hot water heated by a heating means and supplying the hot water discharged from the can body,
A vacuum heat insulating material provided on the outer periphery of the can body so as to cover the other area while leaving a part of the exposed area of the side surface of the can body,
While covering the outer peripheral portion of the exposed region of the side surface of the can body, a foam heat insulating material provided on the outer peripheral portion of the vacuum heat insulating material,
Have
A hot water storage type hot water supply apparatus, wherein a heating object is provided on an outer peripheral portion of a can body covering region that covers an outer peripheral portion of the exposed region of the can body among the foamed heat insulating material. The can body covering region of the foam insulation is,
It is provided with the adhesion convex part which protrudes in the diameter direction inside rather than other fields in the part where the vacuum heat insulating material of the peripheral side of the side of the can body is not provided, and adheres to the side of the can body. Item 2. A hot water storage type hot water supply apparatus according to item 1. The heating object is
The hot water storage type hot water supply apparatus according to claim 2, wherein the hot water storage type hot water supply apparatus is provided on an outer side in a radial direction of the close contact convex portion in the can body covering region. The heating object is
The hot water storage type hot water supply apparatus according to any one of claims 1 to 3, wherein the hot water storage type hot water supply apparatus is disposed in a concave portion provided in the outer peripheral portion of the can body covering region. The heating object is
The hot water storage system according to any one of claims 1 to 4, wherein the hot water supplied to the can body or a pipe through which water is supplied to the can body, or a functional component. Hot water supply device. The can body is
A hot water discharge pipe for discharging the hot water is connected to the upper end and a water supply pipe into which the water is introduced is connected to the lower end,
The heating object is
The hot water storage type hot water supply apparatus according to claim 5, wherein the water supply pipe is used as the pipe.

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