JP2000320960A - Cooling storage box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the cooling time required for initial cooling or after defrosting by controlling a fan to start operation when the temperature detected by a temperature-sensitive member for detecting the temperature at the refrigerant inlet of a cooler drops below a specified level thereby avoiding delayed starting of the fan. SOLUTION: A temperature-sensitive member 24 of rectangular cross-section comprising a mechanical bimetal thermostat, a semiconductor thermister, or the like, is fixed by means of a fixing member 26 to a bend part 23A located at the refrigerant inlet 13A of a cooler 13 disposed oppositely to a storage chamber. The temperature-sensitive member 24 is held stably through cooperation of the horizontal side of the fixing member 26 and a holding part. A compressor is started to condensate delivered high temperature refrigerant and the pressure thereof is reduced by an expansion valve. Subsequently, the refrigerant flows from the refrigerant inlet 13A of the cooler 13 into refrigeration piping 22 where it is evaporated to generate chill. When the temperature at the bend part 23A detected by the temperature-sensitive member 24 drops down to a specified level, a fan is actuated through a controller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling storage provided with a cooler.

[0002]

2. Description of the Related Art Conventionally, in a refrigerator of this type, such as a commercial refrigerator installed in a kitchen of a restaurant, for example, Japanese Utility Model Laid-Open No. 3-127188 (F25D2).
As shown in FIG. 9/00), a cooler having a plurality of heat exchange fins penetrating a meandering refrigerant pipe is provided, and the cool air that has exchanged heat with the cooler is circulated into the refrigerator by a blower. The inside of the refrigerator is cooled to a predetermined temperature.

[0003] Further, a temperature-sensitive member is attached to the cooler for various purposes such as delayed start-up of the blower or the like.
In this case, in the above-mentioned publication, a mounting device having a fixing portion elastically fixed across the opposed refrigerant pipes located between the heat exchange fins is prepared, and the mounting device holds the temperature-sensitive member. .

[0004]

However, in order to fix the mounting device to the refrigerant pipe between the heat exchange fins as in the above-described conventional structure, the fixing device must be engaged while pushing and expanding it by utilizing the elasticity of the fixing portion. Installation work becomes relatively difficult. In particular, if the elastic restoring force of the fixing portion is increased in order to secure the fixing device, the mounting operation of the fixing device becomes even more difficult.

[0005] When the blower is to be started with delay as described above, the temperature sensing member is attached to the refrigerant pipe of that portion so as to detect the temperature at the refrigerant inlet of the cooler. And at the time of starting the initial cooling operation after the installation of the cooling storage, or
When the cooling operation is restarted after the defrosting of the cooler, the blower is stopped until the temperature at the refrigerant inlet of the cooler having a high temperature drops to a predetermined value, thereby increasing the temperature and pressure in the refrigerator. To prevent inconveniences such as the door being opened, but with the structure as in the above-mentioned publication,
The area in contact with the temperature-sensitive member is larger in the surrounding air than in the refrigerant pipe, and almost all the temperature of the surrounding air is detected.

In addition, since the blower is stopped, the flow of air around the temperature-sensitive member is only natural convection, and almost no air flow is present. Therefore, the temperature-sensitive member can more easily detect the temperature of the surrounding air. Therefore, its temperature sensitivity deteriorates remarkably. Therefore, the decrease in temperature detected by the temperature-sensitive member is delayed,
There is a problem that the activation of the blower is delayed more than necessary.

FIG. 6 shows the temperature transition at the refrigerant inlet of the cooler after the start of the cooling operation when this type of cooling storage is installed (pull-down from + 30 ° C.). In FIG. 6, L1 indicates a case where an expansion valve is used as a pressure reducing device of the refrigerant circuit, and L2 indicates a case where a capillary tube is used. Comparing the temperature gradient at the beginning of the cooling operation, the gradient is more gentle when the expansion valve is used, as is clear from FIG. This is because the expansion valve tries to keep the degree of superheating with the refrigerant outlet temperature of the cooler constant, and thereby, especially when the expansion valve is used, the start-up of the blower is delayed, and the cooling of the inside of the refrigerator is not performed. There has been a problem that the time required is significantly long.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problems, and an object of the present invention is to provide a cooling storage in which the temperature sensitivity of a temperature-sensitive member attached to a cooler is improved and control performance is improved. And

[0009]

According to a first aspect of the present invention, there is provided a cooling storage for cooling cold air, which has exchanged heat with a cooler, by circulating the cooled air into a cooler by a blower. A temperature-sensitive member that detects the temperature-sensitive member, a control device that starts the operation of the blower when the temperature detected by the temperature-sensitive member decreases to a predetermined value, and a heat insulating material that surrounds the temperature-sensitive member, The temperature sensitivity of the refrigerant piping by the temperature-sensitive member is improved,
Therefore, it is possible to avoid unnecessary delay start of the blower due to the temperature detected by the temperature sensing member being delayed at the ambient temperature,
The cooling time during initial cooling or after defrosting can be reduced.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an upper longitudinal sectional view of a cooling storage 1 according to an embodiment of the present invention. The cooling storage 1 of the embodiment is a commercial refrigerator installed in a restaurant kitchen or the like, and forms a storage room 3 inside a heat insulating box 2 that opens forward, and a front opening of the storage room 3 has a heat insulating door 4. Is openably closed. An opening 6 is formed in the top wall 2 </ b> A of the heat insulating box 2, and a heat insulating plate 7 is attached so as to close the opening 6.

A compressor 8, a condenser 9, a condenser blower 11 and the like of a cooling device R are installed on the upper surface of the heat insulating plate 7, and the front thereof is closed by a grill 12.
Further, a control device C is provided behind the grille 12 in a housing such as an electric box (not shown). On the other hand, on the lower surface of the heat insulating plate 7, a cooler 13 constituting a well-known refrigeration cycle of the cooling device R together with the compressor 8, the condenser 9 and a pressure reducing device (expansion valve) not shown, etc., and a blower 14 in front thereof. It is mounted and located in the storage room 3. This cooler 13
A dew receiving plate 16 is opposed to the lower surface of the device, a suction port 17 is formed at a position facing the blower 14 in front of the dew receiving plate 16, and a discharge port 18 is formed behind the dew receiving plate 16. ing.

The cooler 13 has a plurality of heat exchange fins 21... Made of a plurality of aluminum thin plates arranged at intervals from each other as shown in FIG. 2 to FIG. And a refrigerant pipe 22 which is arranged in a meandering manner. That is, the refrigerant pipe 22 is bent in a U-shape outside the heat exchange fins 21, 21 located at the outermost (left and right ends), and the bend portion 23 is formed there. A temperature-sensitive member 24 having a rectangular cross section made of a mechanical bimetal thermostat or a semiconductor thermistor is attached to a bend portion 23A located at the refrigerant inlet portion 13A of the cooler 13 by an attachment member 26. .

The mounting member 26 is made of a thermally conductive material such as an aluminum plate, and extends upward from the horizontal side 31 and the front and rear ends of the horizontal side 31, and has fixed portions 32, 32 having curved shapes opposed to each other. And descend from both sides of the horizontal side 31,
Opposite side walls 34, 36 that define the storage section of the temperature-sensitive member 24 in cooperation with the horizontal side 31, and are bent downward from one side wall 34 to the horizontal side 31, so that the temperature-sensitive member 24 is
1 and a flexible holding portion 37 to be held between them. A notch 38 is provided between the side wall 34 and the horizontal side 31 so that the side wall 34 can be easily bent.

Then, with the holding portion 37 of the mounting member 26 bent downward, the temperature sensing member 2 is placed below the horizontal side 31.
4 is inserted as shown by the dashed arrow in FIG. 3, and then the holding portion 37 is returned to the lower side of the temperature-sensitive member 24 so that the temperature-sensitive member 2
4 is held by the mounting member 26. At this time, the temperature sensing member 2
4 is stably held by the cooperation of the horizontal side 31 and the holding portion 37, and the side walls 34, 36 serve as a shift preventing member for pressing the opposing side surfaces of the temperature sensing member 24 to prevent a lateral shift. Works.

After the temperature-sensitive member 24 is held by the mounting member 26, the fixing portions 32, 32 are slid from the front end side to the bend portion 23A of the cooler 13 as indicated by solid arrows in FIG. As a result, as shown in FIG.
At the base of A, the refrigerant pipes 22 and 22 are fitted across the refrigerant pipes 22 and 22 facing each other. Therefore, the attachment member 26 can be attached to the cooler 13 extremely easily and reliably as compared with the case where the heat exchange fins 22 are provided between the heat exchange fins 22. Further, this allows the temperature-sensitive member 24 to be attached to the heat-conductive mounting member 2.
6 and is attached to the bend portion 23A of the refrigerant pipe 22 on the refrigerant inlet 13A side of the cooler 13 by heat exchange.

After the temperature-sensitive members 24 are attached to the cooler 13 by the attachment members 26, they are wrapped in a heat insulating material 41 as shown in FIG. The heat insulating material 41 is a heat insulating thin plate having flexibility, and includes an upper portion 41A, a lower portion 41B, and a front portion 41 centered on a slit-shaped through hole 42 as shown in FIG.
C and a rear overhang portion 41D. Then, as shown by the dashed arrow in FIG. 4, a heat insulating material 41 is applied from the tip side of the bend portion 23A of the cooler 13, and the bend portion 2
In the state where 3A protrudes outward, as shown in FIG.
1A, the lower portion 41B, the front portion 41C, and the rear overhang portion 41D are folded to surround the refrigerant pipe 22, the mounting member 26, and the temperature sensing member 24 at the base of the bend portion 23A.

Then, the rear overhang portion 41D is sandwiched between a wind direction plate 51 for preventing a short circuit of the cooler 13, and the heat insulating material 41 is tightened with bands 52, 53 from outside. Each of the bands 52 and 53 is a band called a binder which is prevented from falling off by inserting the other end into one end, and the band 53 fastens the front part 41C of the heat insulating material 41 on the front side of the temperature sensing member 24. . Also, the band 52
Tightens the heat insulating material 41 from the outside inside the bend portion 23A. As a result, the heat insulating material 41 is
And, it is securely mounted around the mounting member 26.

In particular, since the band 52 fastens the heat insulating material 41 inside the bend 23A, the mounting member 2
Even if 6 is removed from the refrigerant pipe 22, the band 52 cannot pass through the bend portion 23A, so that the attachment member 26 and the temperature-sensitive member 24 are securely prevented from dropping from the cooler 13.

Next, the operation of the above configuration will be described. When the cooling storage 1 is installed and turned on, the storage room 3
The temperature inside is high. The control device C is based on the temperature in the storage room 3, and when the temperature is equal to or higher than a predetermined upper limit temperature, the compressor 8
And the condenser blower 11 is started. At this time, the control device C does not start the blower 14 yet.

Although the temperature of the cooler 13 is initially as high as the temperature in the storage room 3, the high-temperature refrigerant discharged by the activation of the compressor 8 is condensed and decompressed by the expansion valve. From the refrigerant inlet 13A to the refrigerant pipe 22
, And the temperature of the cooler 13 decreases rapidly. Then, when the temperature of the bend portion 23A (the refrigerant inlet portion 13A) detected by the temperature-sensitive member 24 decreases to a predetermined value (for example, 0 ° C.), the control device C sets the temperature-sensitive member 24
The blower 14 is started based on. Note that such control is also performed when the cooler 13 is restarted after defrosting.

When the blower 14 is started, the air in the storage chamber 3 is sucked from the suction port 17 and sent to the cooler 13. There, heat is exchanged with the cooler 13 to be cooled, and the discharge port 1
8 discharges into the storage chamber 3. In this case, the blower 14
As described above, since the activation of the cooler 13 is delayed until the temperature of the cooler 13 decreases, the temperature and pressure in the storage chamber 3 rise due to the circulation of warm air (particularly after defrosting) in the storage chamber 3. Is prevented, and inconveniences such as opening of the heat insulating door 4 are also eliminated.

On the other hand, since the heat insulating member 41 is provided around the temperature sensing member 24 so as to surround the same, the temperature sensing member 24 detects the temperature of the bend portion 23A exclusively without being affected by the ambient temperature. become. As a result, the temperature sensitivity of the refrigerant pipe 22 by the temperature sensing member 24 is improved, and unnecessary delay activation of the blower 14 due to a delay in the temperature detected by the temperature sensing member 24 at the ambient temperature is avoided. Thus, it is possible to shorten the initial cooling time after installation and the cooling time after defrosting.

In the embodiment, the present invention is applied to a commercial refrigerator. However, the present invention is not limited to this, and the present invention is effective for various cooling storages such as a home refrigerator and a showcase. Further, although the temperature sensing member 24 is used for delay start control of the blower 14, the invention according to claims 1 and 2 is also effective for a temperature sensing member for any other use. Absent.

[0024]

According to the first aspect of the present invention, as described in detail above, a temperature sensing member for detecting a temperature of a refrigerant inlet of a cooler;
A control device is provided to start the operation of the blower when the temperature detected by the temperature-sensitive member drops to a predetermined value, and a heat insulating material is provided around the temperature-sensitive member so as to surround it. The temperature sensitivity of the refrigerant pipe by the heating member is improved. Therefore, unnecessary start-up of the blower due to delay of the temperature detected by the temperature-sensitive member at the ambient temperature can be avoided, and the cooling time at the time of initial cooling or after defrosting can be reduced. It is.

[Brief description of the drawings]

FIG. 1 is an upper longitudinal sectional view of a cooling storage according to an embodiment of the present invention.

FIG. 2 is a side view of a cooler of the cooling storage according to the present invention.

FIG. 3 is a diagram illustrating a procedure for mounting a temperature-sensitive member and a mounting member.

FIG. 4 is a diagram illustrating a procedure for attaching a heat insulating material.

FIG. 5 is an enlarged perspective view of a cooler in a mounting member portion.

FIG. 6 is a diagram showing a temperature transition of a refrigerant inlet of a cooler after a cooling operation is started when a cooling storage is installed.

[Explanation of symbols]

 C Control device 1 Cooling storage 13 Cooler 13A Refrigerant inlet 14 Blower 21 Heat exchange fins 22 Refrigerant pipe 23, 23A Bend 24 Heat sensing member 26 Mounting member 41 Insulation material 52 Band

Claims (1)

[Claims] In a cooling storage for cooling by circulating cool air having exchanged heat with a cooler into a refrigerator by a blower, a temperature-sensitive member for detecting a temperature of a refrigerant inlet portion of the cooler, and the temperature-sensitive member detects the temperature. A cooling storage, comprising: a control device that starts the operation of the blower when the temperature to be lowered to a predetermined value; and a heat insulator surrounding the temperature-sensitive member.