JP6319624B2 - Bath hot water system - Google Patents

Description

The present invention relates to a bath hot water supply system provided with a pilot type on-off valve used for, for example, on / off switching of a pouring operation from a hot water supply apparatus to a bathtub or other fluid control applications.

As a pilot type on-off valve, there exists a thing of patent document 1 (FIGS. 3-5), for example.
The pilot-type on-off valve described in the same document is provided with a partition wall portion having a tip as a valve seat in a fluid inflow space in a valve casing, and a leading end opening of the partition wall portion is provided as a diaphragm valve body. Is configured to be openable and closable. Out of the space portion, an outer region and an inner region of the partition wall are a primary channel and a secondary channel, respectively. The diaphragm valve body has a pilot hole and a bleed hole. In the valve closing operation, the pilot hole is closed by a plunger, and the primary side flow path from the bleed hole to the back pressure chamber on the back side of the diaphragm valve body. The primary pressure is introduced. Since the closed state of the pilot type on-off valve is maintained using the primary pressure, it is reasonable.

  However, the prior art has room for improvement as described below.

That is, other fluid equipment such as a flow control valve may be provided on the upstream side of the pilot type on-off valve, but in such a case, pressure loss occurs in the other fluid equipment. The primary pressure of the pilot type on-off valve may be low. On the other hand, due to various restrictions, the flow path diameter of the secondary flow path of the pilot type on-off valve may not be sufficiently large. In such a case, the flow resistance of the secondary flow path is growing.
As the difference between the primary pressure and the secondary pressure is larger, the pilot type on-off valve can stabilize the valve closed state by strongly pressing the diaphragm valve body against the valve seat. When the primary pressure is low or the flow resistance of the secondary flow path is large, the smoothness of the valve closing operation is inferior. Also, the valve closed state becomes unstable, and there is a possibility that the diaphragm valve body vibrates due to, for example, a relatively small change in the primary pressure and abnormal noise is generated.
Further, when the pilot type on-off valve is used as a hot water pouring control valve for controlling hot hot water from the hot water supply device to the bathtub, for example, hot water (for example, around 80 ° C.) flows into the hot water. Although the primary pressure is relatively high, cavitation is likely to occur in the primary flow path or in the fluid equipment installed upstream thereof. When such cavitation occurs, the valve closed state also becomes unstable.

Japanese Patent No. 3835281

The present invention has been proposed under the circumstances described above, the smooth and closed valve preferably can be anticipated that pilot-off valve to stabilize the state of the valve closing operation than conventional The challenge is to provide a bath water supply system equipped.

  In order to solve the above problems, the present invention takes the following technical means.

Bath hot-water supply system and more are provided in the onset Ming, includes a hot water supply passage for supplying the hot water to the bathtub from the hot water supply device, the opening and closing valve of the pouring operation control provided in the hot water supplying passage In the bath hot water system, a pilot-type on-off valve is used as the on-off valve, and the pilot-type on-off valve has a space chamber for fluid inflow therein, and in this space chamber, A partition wall having a front end serving as a first valve seat and a front end opening serving as a valve opening is provided, and an outer region and an inner region of the partition include a primary channel and a secondary flow, respectively. A valve casing that is formed as a passage, and is capable of reciprocating so as to face the first valve seat so as to be able to open and close the valve opening, and closes the primary pressure in the primary flow path Of the secondary side flow path by using it as a back pressure for Are possible valve closing against the pressure, and a diaphragm valve body which abuts portion is elastically deformable in the valve seat comprises a, of the inner peripheral surface of the partition wall, A step portion provided at a position lower than the first valve seat and having an inner diameter smaller than that of the first valve seat and a portion near the lower portion thereof, the step portion includes the first valve seat. A plane-view annular surface projecting radially inward of the partition wall from the inner peripheral surface of the lower portion of the seat, and this surface serves as a second valve seat; Is in contact with only the first valve seat and both the first and second valve seats according to the difference between the primary pressure and the secondary pressure. It is characterized by being able to change to the state.

According to such a configuration, the following effects can be obtained.
First, when the valve is closed, when the primary pressure is higher than the secondary pressure and the pressure difference is large, the diaphragm valve body can be brought into contact with both the first and second valve seats. is there. In such a state, it is assumed that the primary pressure is reduced, the difference between the primary pressure and the secondary pressure is slightly reduced, and the diaphragm valve body is separated from the second valve seat. However, by maintaining the state in which the diaphragm valve body is in contact with the first valve seat, the valve is not immediately opened, and the valve closed state can be appropriately maintained. Therefore, for example, even if a phenomenon occurs in which the primary pressure drops due to pressure loss in other fluid equipment installed upstream of the pilot type on-off valve or cavitation occurs in the primary side flow path. The valve closed state can be stabilized. As a result, it is possible to suitably prevent a problem that the diaphragm valve element generates vibration noise.
Since the second valve seat protrudes inward in the radial direction of the partition wall portion from the inner peripheral surface of the partition wall portion, when the diaphragm valve body comes into contact with the second valve seat, the diaphragm valve body is The area of the area facing the secondary flow path (area receiving the secondary pressure) is smaller than when contacting only the first valve seat. Therefore, the diaphragm valve body can be brought into contact with the first and second valve seats with a stronger force accordingly.
When the valve closing operation is performed from the valve open state, when the diaphragm valve body approaches the first and second valve seats, the fluid passes through the gap formed between them. To the secondary channel. On the other hand, a step portion constituting the second valve seat is provided on the inner peripheral surface of the partition wall portion, and since the inner diameter of the partition wall portion is reduced in this portion, the space between this portion and the diaphragm valve body is reduced. In addition, a narrow gap can be formed. Such a gap causes an action of increasing the flow velocity of the fluid flowing through the valve opening from the primary side flow path to the secondary side flow path. Due to this action, the diaphragm valve body can easily advance toward the first and second valve seats during the valve closing operation, and the valve closing operation can be made smooth.

  In the present invention, it is preferable that an inner peripheral surface of the inner peripheral surface of the partition wall portion between the first and second valve seats is an axial length of the partition wall portion from the second valve seat. It is set as the surface which stood up substantially along the direction, or was made into the inclined surface whose inclination angle with respect to the said axial length direction is within 45 degrees.

  According to such a configuration, the diaphragm valve body can be efficiently brought into pressure contact with the first and second valve seats. That is, when the diaphragm valve body is excessively pressed against the inner circumferential surface located between the first and second valve seats and receives the reaction force, the diaphragm valve body is moved to the first and second diaphragms. It becomes difficult to press the valve seat strongly. On the other hand, according to the said structure, such a malfunction can be prevented or suppressed appropriately.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is explanatory drawing which shows an example of schematic structure of the bath hot-water supply system which concerns on this invention. An example of the pilot type on-off valve used in the present invention is shown, in which (a) is a cross-sectional view of a main part in a valve closed state, and (b) is a cross-sectional view of a main part in a valve open state. (A), (b) is a principal part expanded sectional view which shows the mode of the valve closing state of the pilot type on-off valve shown in FIG. 2, (c) is the valve open state of the pilot type on-off valve shown in FIG. It is a principal part expanded sectional view which shows this. It is a principal part enlarged view which shows the other example of this invention. (A) is principal part sectional drawing which shows contrast with this invention, (b) is a principal part expanded sectional view of (a).

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

First, the configuration of the pilot type on-off valve V1 shown in FIG. 2 will be described.
The pilot type on-off valve V1 includes a plunger 30 having a valve casing 1, a diaphragm valve body 2, and an electromagnetic solenoid 3 as drive sources.

  The valve casing 1 is made of, for example, resin, and a space chamber 10 for fluid inflow is formed in the valve casing 1. In this space chamber 10, a substantially cylindrical or annular partition wall portion 4 is provided that rises upward from the bottom surface portion 13 thereof. The upper end opening of the partition wall 4 is a valve opening 40 that is opened and closed by the diaphragm valve body 2, and the front end (upper end) of the partition wall 4 is a first valve seat 41. In the space chamber 10, the outer region of the partition wall 4 corresponds to the primary channel 11, and the inner region of the partition 4 corresponds to the secondary channel 12. A fluid is supplied to the primary channel 11 from the outside via a fluid inlet (not shown) provided separately in the valve casing 1. In the drawing, the width of the upstream portion 11a of the primary channel 11 is shown to be small, but this upstream portion 11a has a relatively large width in the direction intersecting the paper surface, and allows the fluid to flow at a desired flow rate. It is necessary and sufficient flow path area. The secondary flow path 12 is formed as a flow path that reaches, for example, a lateral flow path 12 a connected to the inner region of the partition wall 4 and reaches the fluid outlet 12 b.

  A stepped portion 43 is formed on the inner peripheral surface of the partition wall 4 near the tip, and a second valve seat 42 is provided (see also FIG. 3). More specifically, a step portion 43 having an inner diameter smaller than that of the first valve seat 41 and its lower portion is formed at a position lower than the first valve seat 41 on the inner peripheral surface of the partition wall portion 4. Has been. The upward surface of the stepped portion 43 is the second valve seat 42, and an annular shape in plan view that protrudes inward in the radial direction of the partition wall portion 4 from the inner peripheral surface of the lower portion of the first valve seat 41. It is. In the present embodiment, the inner peripheral surface 44 located between the first and second valve seats 41 and 42 stands up at a substantially right angle from the second valve seat 42, and the axial direction of the partition wall portion 4 (see FIG. 2 and the vertical direction in FIG. 3).

  The diaphragm valve body 2 can be reciprocated facing the first and second valve seats 41 and 42, and a diaphragm plate 21 made of a relatively hard resin is attached to the diaphragm 20 made of an elastic member such as fluorine rubber. It is assembled and configured. The diaphragm plate 21 plays a role of backing up a portion of the diaphragm 20 that faces the first and second valve seats 41 and 42 and a fixed region around the portion so as not to bend unreasonably. A back pressure chamber 19 is formed on the back side of the diaphragm valve body 2 (upper side in FIG. 2). The diaphragm valve body 2 is provided with a pilot hole 22 for communicating the back pressure chamber 19 with the secondary flow path 12 and a bleed hole 23 for communicating the back pressure chamber 19 with the primary flow path 11. ing. Although not shown in the drawing, a configuration may be provided in which means for preventing the fluid in the back pressure chamber 19 from flowing back through the bleed hole 23 and back into the primary channel 11 is also possible.

The plunger 30 can reciprocate on the back side of the diaphragm plate 21. As shown in FIG. 2B, when the plunger 7 is retracted, the pilot hole 22 is opened and the back pressure chamber 19 and the secondary flow path 12 communicate with each other. It is possible to make the valve opening 40 open by reversing by two. On the other hand, as shown in FIG. 2A, when the plunger 30 moves forward, the diaphragm valve body 2 is closed to the first and second valve seats 41 and 42 side while closing the one end side opening of the pilot hole 22. To close the valve. The condition for establishing this valve closed state is as shown in Equation 1 below.
(P1 ′ · A1′−P1 · A1)> P2 · A2 Formula 1
P1 ': Pressure in the back pressure chamber 19 (same or substantially the same as the primary pressure P1)
A1 ′: Effective area where diaphragm valve body 2 receives pressure P1 ′ downward P1: Primary pressure A1: Effective area where diaphragm valve body 2 receives primary pressure P1 upward P2: Secondary pressure A2: Diaphragm valve body 2 Effective area that receives the secondary pressure P2 upward

  In the pilot type on-off valve V1, when the difference between the primary pressure P1 and the secondary pressure P2 is relatively small in the valve closed state, the diaphragm valve body 2 is moved as shown in FIG. Only one valve seat 41 contacts. On the other hand, when the difference between the primary pressure P1 and the secondary pressure P2 is large, the diaphragm valve body 2 has the first and second valve seats 41 and 42 as shown in FIG. Abut on both sides. The height difference between the first and second valve seats 41 and 42 is, for example, about 0.5 mm, and the thickness of the diaphragm 20 facing these portions is, for example, 1.5 to 2.0 mm.

  Next, the operation of the pilot type on-off valve V1 will be described.

  First, at a normal time when the differential pressure between the primary pressure P1 and the secondary pressure P2 can be increased, as shown in FIG. 3B, the diaphragm valve body 2 is moved to the first and second valve seats. 41 and 42 can be brought into contact with each other. In such a state, even if for some reason, the primary pressure P1 decreases and the difference between the primary pressure P1 and the secondary pressure P2 decreases, and the diaphragm valve body 2 slightly increases. As shown in FIG. 3A, it is possible to maintain the state in which the diaphragm valve body 2 is in contact with the first valve seat 41. Therefore, the valve opening state immediately after the primary pressure P1 is reduced is eliminated, and the valve closing state is stabilized.

As understood from FIGS. 3A and 3B, the diaphragm valve body 2 is in contact with the first and second valve seats 41 and 42 rather than the case in which the diaphragm valve body 2 is in contact with only the first valve seat 41. In this case, the area A2 where the diaphragm valve body 2 receives the secondary pressure P2 becomes smaller (A2 ′> A2 ″). Therefore, the diaphragm valve body 2 is brought into contact with the first and second valve seats 41 and 42. In this case, the pressing force of the diaphragm valve body 2 due to the secondary pressure P2 becomes small, which is more preferable for stabilizing the valve closed state.

  Since the second valve seat 42 is an upward surface facing the diaphragm valve body 2, an action of increasing the pressure contact force of the diaphragm valve body 2 with respect to the second valve seat 42 is obtained. This point will be described with reference to the comparison in FIG. 5. In this comparison, a portion corresponding to the second valve seat 42 of the present embodiment is not provided, and the first valve seat 41 is not provided. The inner peripheral surface 44a of the lower region is a simple inclined surface. When the diaphragm valve body 2 is simply brought into pressure contact with the inner peripheral surface 44a in the valve closed state, the pressure contact force between the diaphragm valve body 2 and the inner peripheral surface 44a is small. Specifically, as shown in FIG. 5B, when the pressing force of the diaphragm valve body 2 is F and the inclination angle of the inner peripheral surface 44a is θ, the diaphragm valve body 2 is moved relative to the inner peripheral surface 44a. The force pressing in the vertical direction is reduced to Ft (= Fsinθ). This is not very effective in improving the water sealing performance between the inner peripheral surface 44a and the diaphragm valve body 2. On the other hand, according to the present embodiment, the diaphragm valve body 2 can be vertically pressed against the second valve seat 42 from above, so that the sealing performance of the second valve seat 42 is excellent. It is possible to make it.

  Furthermore, in this embodiment, since the inner peripheral surface 44 between the first and second valve seats 41 and 42 stands up substantially at a right angle from the second valve seat 42, this inner peripheral surface. It is avoided that the diaphragm valve body 2 is in strong pressure contact with 44. Therefore, the advantage that the diaphragm valve body 2 can be strongly pressed against the first and second valve seats 41 and 42 by that amount is also obtained.

  When the diaphragm valve body 2 approaches the first and second valve seats 41 and 42 during the transition from the valve open state shown in FIG. 2B to the valve closed state shown in FIG. The fluid passes from the primary channel 11 toward the secondary channel 12 in the gap formed therebetween. On the other hand, the step part 43 which comprises the 2nd valve seat 42 is provided in the internal peripheral surface of the partition part 4, Compared with the case where such a step part 43 is not provided, a narrow gap | interval is long. Can be formed at a distance. As a result, the action of increasing the flow velocity of the fluid passing through the gap is more effectively obtained, and the diaphragm valve body 2 can easily move forward toward the first and second valve seats 41 and 42. As a result, the valve closing operation can be facilitated.

  Next, the bath hot water supply system S of FIG. 1 configured using the pilot type on-off valve V1 will be described.

  The bath hot-water supply system S of this embodiment is a high-temperature hot-water supply system, and includes a hot-water supply device 5 having a burner 50 and a heat exchanger 51, and a hot-water supply path 7 for supplying hot water from the hot-water supply device 5 to the bathtub 6. A pilot-type on-off valve V1 is used as an on-off valve for pouring operation control provided in the middle of the hot water supply passage 7.

The hot water supply device 5 is configured such that hot water that has entered the water inlet 80 a is sent to the heat exchanger 51 and heated, and the heated hot water is discharged from the hot water outlet 81 a of the hot water outlet piping 81 for general hot water supply. It is possible. The hot water supply passage 7 is branched and connected to a hot water supply piping passage 81, and a flow rate adjusting valve Va and a filter FL are provided on the upstream side of the pilot type on-off valve V1. When the pilot type on-off valve V1 is configured, it is possible to integrate the flow rate adjusting valve Va, the filter FL, and the check valve Vb shown in FIG. is there. For example, two check valves Vc and Vd are provided on the downstream side of the pilot on-off valve V1. The hot water supply path 7 is connected to a piping path 82 that connects the downstream side of the flow rate adjustment valve Ve and the upstream side of the two check valves Vc and Vd in the hot water supply path 81 and includes an on-off valve Vf. ing. When supplying hot water in a manner different from the hot water supply to the bathtub 6, the piping 82 can be used. The two check valves Vc and Vd and the on-off valve Vf can be configured to be incorporated in one valve casing 90. In addition, the pilot type on-off valve V1 can also be used as the on-off valve Vf.

  In the bath hot water supply system S of the present embodiment, the hot water supply to the bathtub 6 can be switched on and off by switching the opening and closing of the pilot type on-off valve V1, but hot water supplied to the pilot type on-off valve V1. The temperature is a high temperature of, for example, about 80 ° C., and the flow rate thereof is smaller than that during normal hot water supply operation, and the primary pressure P1 is considered to be high. Corresponding to the small amount of hot water flow, for example, the inner diameter d1 of the flow path 12a of the secondary flow path 12 shown in FIG. However, with such a specification, since the flow resistance of the secondary flow path 12 increases, the secondary pressure P2 of the secondary flow path 12 increases during the valve closing operation, and the primary pressure P1. Even if the pressure is relatively high, it becomes difficult to take a large differential pressure between them. A large pressure loss occurs in the flow rate adjusting valve Va provided upstream of the pilot type on-off valve V1, and a phenomenon that the primary pressure P1 is lowered may also occur. Furthermore, cavitation may occur due to the operation of the flow regulating valve Va, and the primary side flow path 11 may be affected by the cavitation. Originally, due to the above-described reasons, there is a risk that the smooth transition to the valve closed state may be difficult or the valve closed state may become unstable, but according to the pilot type on-off valve V1, It is possible to appropriately eliminate or suppress the fear as described above.

  FIG. 4 shows another embodiment of the present invention. In the figure, the same or similar elements as those in the above embodiment are given the same reference numerals as in the above embodiment.

In the embodiment shown in FIG. 4, the inner peripheral surface 44 between the first and second valve seats 41, 42 is inclined at an appropriate inclination angle α with respect to the axial length direction of the partition wall portion 4. . Preferably, the inclination angle α is 45 ° or less.
According to this embodiment, when the diaphragm valve body 2 is brought into contact with the first and second valve seats 41, 42, the diaphragm valve body 2 is also pressed against the inner peripheral surface 44. However, since the second valve seat 42 has a non-inclined upward surface, the diaphragm valve body 2 can be firmly pressed against the second valve seat 42 as well. This is significantly different from the proportionality shown in FIG. Further, if the inclination angle α is less than 45 °, the pressure contact force of the diaphragm valve body 2 with respect to the inner peripheral surface 44 is reduced, and the pressure contact force of the diaphragm valve body 2 with respect to the first and second valve seats 41 and 42 is reduced. Can be increased.

The present invention is not limited to the contents of the above-described embodiment. The specific structure of each part of the engagement Ru wind Lu hot water supply system in the present invention may be varied in design in many ways within the intended scope of the present invention.

For example, the second valve seat referred to in the present invention does not necessarily have a flat shape, and may be, for example, a curved surface that is curved upward (toward the diaphragm valve body) or a shape in which a part is raised. I can .

DESCRIPTION OF SYMBOLS S Bath hot-water supply system V1 Pilot type on-off valve 1 Valve casing 2 Diaphragm valve body 4 Partition part 5 Hot-water supply apparatus 6 Bathtub 7 Hot water supply path 10 Space room 11 Primary side flow path 12 Secondary side flow path 19 Back pressure chamber 22 Pilot hole 23 Bleed hole 40 Valve opening 41 First valve seat 42 Second valve seat 43 Step 44 Inner peripheral surface (between the first and second valve seats)

Claims (2)

A hot water supply path for supplying hot water from the hot water supply device to the bathtub;
An on-off valve for controlling the pouring operation provided in the hot water supply path;
A bath hot water system comprising:
As the on-off valve, a pilot type on-off valve is used,
The pilot type on-off valve is
A space chamber for inflow of fluid is formed in the interior, and the space chamber is provided with a partition wall having a front end serving as a first valve seat and a front end opening serving as a valve opening. A valve casing in which an outer region and an inner region of the part are respectively a primary channel and a secondary channel;
By opening and closing the valve opening so as to be able to reciprocate against the first valve seat, and using the primary pressure of the primary flow path as a back pressure for closing the valve A diaphragm valve body that is capable of valve closing operation against the secondary pressure of the secondary side flow path and that is elastically deformable at a portion in contact with the valve seat ;
Of the inner peripheral surface of the partition wall portion, provided at a position lower than the first valve seat, and provided with a stepped portion having an inner diameter smaller than that of the first valve seat and its lower portion,
The step portion has an annular surface in plan view that protrudes inward in the radial direction of the partition wall from the inner peripheral surface of the lower portion of the first valve seat, and this surface is the second valve seat. And
When the valve is closed, depending on the difference between the primary pressure and the secondary pressure, the diaphragm valve body abuts only on the first valve seat, and the first and second valve seats A bath hot-water supply system characterized in that it can be changed to a state where both are in contact with each other. The bath hot water system according to claim 1,
Of the inner peripheral surface of the partition wall, the inner peripheral surface located between the first and second valve seats stands substantially along the axial length direction of the partition wall from the second valve seat. A bath hot water supply system that is a surface or an inclined surface having an inclination angle with respect to the axial length direction of 45 ° or less.

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