Cooling storage

Abstract

This device suppresses the temperature rise in the storage chamber after defrosting while also suppressing abnormal noise from the check valve used in the refrigeration circuit. [Solution] The cooling storage unit 10 includes a first cooler 22 for cooling a first storage chamber 12, a second cooler 23 for cooling a second storage chamber 13 to a lower temperature than the first storage chamber 12, a check valve 70 to prevent refrigerant from the first cooler 22 from flowing into the second cooler 23, a valve 27 for switching the refrigerant supply destination to at least one of the first cooler 22 or the second cooler 23, a first defrosting means 32, a second defrosting means 33, and a control unit 60. The check valve 70 has a valve body 73 that displaces according to the pressure difference between the refrigerant on the first cooler 22 side and the refrigerant on the second cooler 23 side, and the displacement of the valve body 73 opens and closes a gap 70S. The control unit 60 immediately restarts the cooling operation after the defrosting operation, and the valve body 73 of the check valve 70 has a mass that is able to be displaced downward by its own weight and close the gap 70S when the valve 27 is operated so that the refrigerant is supplied to the first cooler 22 during the restarted cooling operation.

Description

Technical Field

[0001] This technology relates to a cooling refrigerator.

Background Art

[0002] Conventionally, in a cooling refrigerator equipped with a refrigerator compartment and a freezer compartment, when the volume of each compartment is small, it is known not to provide a refrigeration circuit for each cooler that cools each compartment, but to provide a common refrigeration circuit. An example of this is disclosed in Patent Document 1. The refrigeration cycle device described in Patent Document 1 has a flow path for supplying refrigerant to the refrigerator cooler, a flow path for supplying refrigerant to the freezer cooler, and a common flow path through which the refrigerant returns from the confluence point of the two flow paths to the compressor and the condenser. Further, the refrigeration cycle device includes a three-way valve for switching the supply destination of the refrigerant from the condenser and a check valve for preventing the refrigerant from flowing back from the refrigerator cooler to the freezer cooler side.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, as a check valve used in the above refrigeration circuit, a type having a valve body between the inlet side and the outlet side of the refrigerant is known. This type of check valve has a simple mechanism for preventing the backflow of refrigerant from the outlet side to the inlet side by the displacement of the valve body to close the gap. The check valve has the advantages of being able to reduce costs and simplify design and maintenance management.

[0005] ​However, in check valves with such a simple structure where the valve body is displaced, the valve body may become suspended depending on the pressure difference between the refrigerant on the inlet and outlet sides. A suspended valve body is susceptible to vibration and other factors, which can generate abnormal noises. When abnormal noises occur, users may find them unpleasant or mistakenly believe that a malfunction has occurred.

[0006] Such abnormal noises are particularly likely to occur during cooling operations that resume after a defrosting operation to melt frost accumulated on the evaporators during cooling. Therefore, one possible method to suppress these noises is to reduce the pressure difference of the refrigerant between the inlet side (freezing evaporator side) and the outlet side (refrigeration evaporator side) by providing a waiting period after the defrosting operation is completed during which refrigerant is not supplied to either the refrigeration evaporator or the freezing evaporator. Reducing the pressure difference makes it less likely for the valve body to become suspended. However, providing a waiting period raises concerns that the temperature in the refrigerator and freezer compartments may rise, potentially causing stored items (food, etc.) to deteriorate or thaw.

[0007] This technology was developed based on the above-mentioned circumstances, and aims to suppress the temperature rise in the storage room after defrosting while also suppressing the generation of abnormal noise from the check valve used in the refrigeration circuit. [Means for solving the problem]

[0008] To solve the above problems, the cooling storage facility related to this technology is The first storage room and The second storage room, A first cooler for cooling the aforementioned first storage chamber, A second cooler that cools the second storage chamber to a lower temperature than the first storage chamber, A compressor for compressing the refrigerants from the first cooler and the second cooler, the compressor being located downstream in the direction of refrigerant flow from the point where the refrigerants from the first cooler and the refrigerants from the second cooler merge, A check valve is provided between the confluence point and the second cooler to prevent refrigerant from the first cooler from flowing into the second cooler, A condenser that liquefies the refrigerant gas compressed by the compressor, A valve that switches the supply destination of the refrigerant from the condenser to at least one of the first cooler or the second cooler, A first defrosting means for melting frost adhering to the first cooler, A second defrosting means for melting frost adhering to the second cooler, It comprises a control unit and, The aforementioned check valve is, The device has a valve body that displaces according to the pressure difference between the refrigerant on the first cooler side and the refrigerant on the second cooler side, The valve body is configured to open and close the gap by being displaced. The direction of displacement of the valve body is along the vertical direction, and the gap is closed when the valve body is displaced downward. The control unit, The compressor is activated to perform a cooling operation. The compressor is stopped, and at least one of the first defrosting means or the second defrosting means is activated to perform a defrosting operation. Immediately after the defrosting operation, the compressor is activated to restart the cooling operation. The valve body of the check valve has a mass that, when the valve is operated so that refrigerant is supplied to the first cooler during the restarted cooling operation, is displaced downward by its own weight and closes the gap.

[0009] Also, The aforementioned check valve is, A valve seat that forms the gap between itself and the valve body and contacts the valve body when it is displaced downward, The valve body is equipped with a stopper that comes into contact with the valve body when it is displaced upward, The valve body may close the gap by contacting the valve seat when the valve is operated so that refrigerant is supplied to the first cooler during the restarted cooling operation. [Effects of the Invention]

[0010] According to the present technology, it is possible to suppress the generation of abnormal noise in the check valve used in the refrigeration circuit while suppressing the temperature rise in the storage chamber after the defrosting operation.

Brief Description of the Drawings

[0011] [Figure 1] Partial cutaway front view of the cooling storage refrigerator according to the present embodiment [Figure 2] Cross-sectional view taken along line I-I of FIG. 1 [Figure 3] Diagram showing the refrigeration circuit [Figure 4] Perspective view showing the components of the refrigeration circuit [Figure 5] Block diagram showing the electrical configuration of the cooling storage refrigerator [Figure 6] Schematic diagram of the check valve [Figure 7] Cross-sectional schematic view showing the state where the valve body of the check valve contacts the valve seat [Figure 8] Cross-sectional schematic view showing the state where the valve body of the check valve contacts the stopper [Figure 9] Cross-sectional schematic view of the main part of the check valve cut along line II-II of FIG. 8 [Figure 10] Cross-sectional view showing the mounting posture of the check valve

Embodiments for Carrying Out the Invention

[0012] The cooling storage refrigerator 10 according to the present embodiment will be described with reference to FIGS. 1 to 10. In some of the drawings, the directions are indicated using the symbols F, B, L, R, U, D, which represent the front side (front), rear side (rear), left side, right side, upper side, and lower side, respectively, when viewing the cooling storage refrigerator 10 from the front.

[0013] As shown in FIGS. 1 to 2, the cooling storage refrigerator 10 generally includes a storage body 11, a door 14, a machine room 16, a refrigeration circuit 20, and a control unit 60. The storage body 11 is a heat-insulated box body that opens forward, and a partition wall 11A that vertically partitions the internal space of the storage body 11 is provided at a substantially central portion in the vertical direction thereof. The internal space of the storage body 11 is divided into a refrigerating chamber 12 below the partition wall 11A and a freezing chamber 13 above the partition wall 11A.

[0014] The refrigerator room 12 is an example of a first storage room, where stored items (food, etc.) are refrigerated and stored at a temperature range of approximately 1°C to 3°C. The freezer room 13 is an example of a second storage room, where stored items are frozen and stored at a temperature range of approximately -15°C to -10°C. However, the cooling temperature range of the first and second storage rooms is not limited as long as the second storage room is cooled to a lower temperature than the first storage room, and both rooms may be either refrigerator rooms or freezers.

[0015] Door 14 is a swing-type insulated door that can open and close the front opening 11S of the storage unit body 11. There are two doors 14, one above the other, that can be opened and closed individually for the refrigerator compartment 12 and the freezer compartment 13.

[0016] A first cooling duct 45 is provided at the upper rear of the freezer compartment 13. Above the first cooling duct 45, a second cooler (freezer compartment cooler) 23 and a second circulation fan (freezer compartment internal fan) 53 are arranged to cool the freezer compartment 13. An intake port 45A is formed at the front of the first cooling duct 45 for drawing in air from inside the freezer compartment 13, and an outlet port 45B is provided at the rear for blowing cold air from the second cooler 23 into the freezer compartment 13.

[0017] A second cooling duct 46 is provided at the rear of the refrigerator compartment 12. Behind the second cooling duct 46, a first cooler (refrigerator cooler) 22 for cooling the refrigerator compartment 12 and a first circulation fan (refrigerator internal fan) 52 are installed. An intake port 46A is formed at the bottom of the second cooling duct 46 for drawing in air from inside the refrigerator compartment 12, and an outlet port 46B is provided at the top for blowing cold air from the first cooler 22 into the refrigerator compartment 12.

[0018] The machine room 16 is located above the main storage unit 11. The machine room 16 houses the machinery constituting the refrigeration circuit 20 (compressor 24 and condenser 25, etc.) and the control unit 60. The front of the machine room 16 is also provided with a display unit and operation unit 62, which consists of a screen for displaying various information and buttons for changing the cooling setting temperature, etc., by user operation. The machine room 16 can communicate with the inside of the main storage unit 11 through an opening provided in the upper wall 11B of the main storage unit 11, but this opening is insulated by fitting an insulating partition plate 15 from the machine room 16 side.

[0019] As shown in Figure 3, the refrigerated storage unit 10 includes a refrigeration circuit 20 in which two coolers 22 and 23, a compressor 24, a condenser 25, a dryer 26, a three-way valve 27 (an example of a valve), and a check valve 70 are connected by a refrigerant pipe 21. A cavilary tube (an example of an expansion valve) is provided between the three-way valve 27 and each of the coolers 22 and 23. As shown in Figure 4, the two coolers 22 and 23 are connected to a single refrigeration circuit 20 by a refrigerant pipe 21 that extends vertically.

[0020] Coolers 22 and 23 each cool the air passing through them by vaporizing the incoming refrigerant, thereby utilizing the heat of vaporization. Coolers 22 and 23 are, for example, fin-and-tube type heat exchangers or microchannel heat exchangers. The refrigerant gases from each cooler 22 and 23 mix at a confluence point 20X where the refrigerant pipes 21 are connected on their output side (downstream in the refrigerant flow direction). The mixture is then returned to the compressor 24 located downstream of the confluence point 20X. In this embodiment, an accumulator 28 is provided between the confluence point 20X and the compressor 24 to prevent liquid refrigerant that was not vaporized in the coolers 22 and 23 from returning to the compressor 24.

[0021] The compressor 24 is an inverter compressor equipped with a variable-speed electric motor. The compressor 24 uses the electric motor as a power source to draw in and compress refrigerant gas, and discharges high-temperature, high-pressure refrigerant gas. However, the compressor 24 does not have to be an inverter compressor; it may have a constant-speed motor.

[0022] The condenser 25 cools and liquefies the refrigerant gas compressed by the compressor 24 using airflow from the condenser fan 29. The dryer 26 removes any moisture mixed in with the refrigerant liquid.

[0023] The three-way valve 27 switches the destination of the refrigerant liquid supplied from the condenser 25 after passing through the dryer 26. As shown in Figure 3, the refrigerant liquid supply from the three-way valve 27 is branched into two channels: the first branch channel 20A to the first cooler 22, or the second branch channel 20B to the second cooler 23. The three-way valve 27 is operated by the control unit 60 and is configured to supply refrigerant liquid in three states: supplying refrigerant liquid only to the first cooler 22 (refrigeration ON and freezing OFF, hereinafter referred to as the "first state"), supplying refrigerant liquid only to the second cooler 23 (refrigeration OFF and freezing ON, hereinafter referred to as the "second state"), or supplying refrigerant liquid to both the first cooler 22 and the second cooler 23 (refrigeration ON and freezing ON, hereinafter referred to as the "third state"). If the three-way valve 27 is not operated, refrigerant liquid is not supplied to either the first cooler 22 or the second cooler 23 (refrigeration OFF and freezing OFF).

[0024] In the refrigeration circuit 20, the flow path from the three-way valve 27 through the first cooler 22 to the confluence point 20X is designated as the first branch flow path 20A, and the flow path from the three-way valve 27 through the second cooler 23 and check valve 70 in order to the confluence point 20X is designated as the second branch flow path 20B. In addition, the flow path from the confluence point 20X through the compressor 24, condenser 25 and dryer 26 in order to the three-way valve 27 is designated as the common flow path 20C. The refrigeration circuit 20 is formed by a first circulation flow path (refrigeration cycle) consisting of the first branch flow path 20A and the common flow path 20C, and a second circulation flow path consisting of the second branch flow path 20B and the common flow path 20C.

[0025] As shown in Figure 5, the control unit 60 is electrically connected to various devices and controls them. The control unit 60 is, for example, a control board including a microcontroller, and may also be equipped with a memory unit and a timing unit.

[0026] The cooling storage unit 10 also includes a first defrost heater 32, a second defrost heater 33, a first defrost sensor 42, and a second defrost sensor 43. The defrost heaters 32 and 33 melt the frost that accumulates on the coolers 22 and 23 during cooling operation. The defrost heaters 32 and 33 are positioned near each of the coolers 22 and 23 to efficiently melt the frost. Known heaters can be used as appropriate for the first defrost heaters 32 and 33.

[0027] The defrost sensors 42 and 43 detect the melting of frost on the coolers 22 and 23, respectively. Specifically, the defrost sensors 42 and 43 are temperature sensors (thermistors) that detect temperature changes in the coolers 22 and 23, respectively. The defrost sensors 42 and 43 are positioned near each of the coolers 22 and 23.

[0028] The control unit 60 performs the cooling operation by activating the compressor 24, condenser fan 29, internal fans 52 and 53, and the three-way valve 27. More specifically, when cooling only the refrigerator compartment 12, the compressor 24, condenser fan 29, and first internal fan 52 are activated, and the three-way valve 27 is operated in the first state (refrigeration ON and freezing OFF). When cooling only the freezer compartment 13, the compressor 24, condenser fan 29, and second internal fan 53 are activated, and the three-way valve 27 is operated in the second state (refrigeration OFF and freezing ON). When cooling both the refrigerator compartment 12 and the freezer compartment 13, the compressor 24, condenser fan 29, internal fans 52 and 53 are activated, and the three-way valve 27 is operated in the third state (refrigeration ON and refrigeration ON).

[0029] As frost accumulates on the coolers 22 and 23 during cooling operation, the control unit 60 periodically performs defrosting operations, such as at predetermined cooling operation intervals. The control unit 60 operates the defrost heaters 32 and 33 to perform defrosting operations. When the temperature detected by the defrost sensors 42 and 43 exceeds a predetermined threshold temperature, the control unit 60 determines that the frost on the coolers 22 and 23 has melted and stops the defrost heaters 32 and 33 to end the defrosting operation. Note that the second cooler 23 is colder than the first cooler 22, and the defrosting completion temperature detected by the second defrost sensor 43 is higher, so defrosting takes longer than for the first cooler 22. For this reason, it is preferable to provide a period of time during which only the second defrost heater 33 continues to operate after the first defrost heater 32 stops, or to set a higher output value for the second defrost heater 33. Once the defrosting operation is complete, the control unit 60 immediately resumes the cooling operation.

[0030] As shown in Figure 3, the check valve 70 is installed between the confluence point 20X and the second cooler 23. The check valve 70 prevents refrigerant from the first cooler 22 from flowing from the confluence point 20X to the second cooler 23. As shown in Figure 6, the check valve 70 is shaped like an elongated cylinder, with one opening of the cylinder being the inlet 70A and the other opening being the outlet 70B. The check valve 70 allows refrigerant from the inlet 70A (second cooler 23 side) to flow to the outlet 70B (confluence point 20X, first cooler 22 side), while restricting flow from the outlet 70B to the inlet 70A.

[0031] As shown in Figures 6 to 8, the check valve 70 comprises a housing 71, a valve seat 72, a valve body 73, and a stopper 74. The housing 71 is an elongated cylindrical (pipe-shaped) exterior member. The valve body 73 is a solid cylinder, with a tapered end 73A on the inlet 70A side. The valve body 73 displaces according to the pressure difference between the refrigerant on the inlet 70A side (second cooler 23 side) and the refrigerant on the outlet 70B side (first cooler 22 side). The valve seat 72 is a cylindrical member provided along the inner circumferential wall of the housing 71. The valve seat 72 has a projection 72A on the inlet 70A side that protrudes to reduce its inner diameter. The projection 72A of the valve seat 72 locks (contacts) the inlet 70A side end 73A of the valve body 73 when the valve body 73 is displaced towards the inlet 70A side. The stopper 74 is provided on the outlet 70B side of the valve body 73. When the valve body 73 is displaced toward the outlet 70B side, the stopper 74 locks (contacts) the end 73B of the valve body 73 toward the outlet 70B side.

[0032] As shown in Figure 10, the check valve 70 is positioned such that its longitudinal direction, which extends in an elongated shape from the inlet 70A to the outlet 70B, is in the vertical direction (from bottom to top). The longitudinal direction of the check valve 70 coincides with the displacement direction of the internal valve body 73.

[0033] When the compressor 24 is stopped and refrigerant is not circulating in the refrigeration circuit 20, there is almost no pressure difference between the refrigerant on the inlet 70A side and the refrigerant on the outlet 70B side of the check valve 70. As a result, the valve body 73 of the check valve 70 is displaced downward by its own gravity (self-weight), as shown in Figure 7, and the end 73A of the valve body 73 on the inlet 70A side comes into contact with the projection 72A of the valve seat 72. This closes the gap 70S (see Figure 8) between the valve body 73 and the projection 72A, preventing refrigerant from flowing from the outlet 70B side (first cooler 22 side) to the inlet 70A side (second cooler 23 side). Since the valve body 73 is in contact with the projection 72A of the valve seat 72 and is not floating, in this case, the problem of abnormal noise being generated in the check valve 70 due to vibration, etc., does not occur.

[0034] During normal cooling operation (cooling operation not immediately following defrosting), the freezer compartment 13 is at a lower temperature than the refrigerator compartment 12. Therefore, when the compressor 24 operates and the three-way valve 27 enters the first state (refrigeration ON and freezing OFF), forming the first circulation path, the refrigerant on the inlet 70A side (second cooler 23 side) of the check valve 70 is at a lower temperature and pressure than on the outlet 70B side (first cooler 22 side). The valve body 73 of the check valve 70 is displaced downward by this pressure difference and its own weight, and as shown in Figure 7, the end 73A on the inlet 70A side of the valve body 73 comes into contact with the projection 72A of the valve seat 72. Therefore, even in this case, the gap 70S between the valve body 73 and the projection 72A is closed, preventing refrigerant from flowing from the outlet 70B side to the inlet 70A side. Similarly, the problem of abnormal noise being generated in the check valve 70 due to vibration, etc., does not occur.

[0035] Furthermore, during normal cooling operation (cooling operation not immediately following defrosting), when the compressor 24 operates and the three-way valve 27 enters a second state (refrigeration OFF and freezing ON), and a second circulation path is formed, as shown in Figure 8, refrigerant flows through the inside of the check valve 70 from the inlet 70A to the outlet 70B. A force exceeding its own weight is applied upward to the valve body 73 (from the inlet 70A to the outlet 70B), and the end 73B of the valve body 73 on the outlet 70B side contacts the stopper 74. Since the valve body 73 is in contact with the stopper 74 and is not floating, in this case as well, the problem of abnormal noise being generated in the check valve 70 due to vibration, etc., does not occur.

[0036] On the other hand, during the cooling operation that resumes after the defrosting operation, the temperature and pressure of the second cooler 23 are high. As previously mentioned, this is because the second cooler 23 takes longer to defrost than the first cooler 22 during the defrosting operation. Therefore, when the compressor 24 operates and the three-way valve 27 enters the first state (refrigeration ON and freezing OFF), and the first circulation path is formed, the refrigerant on the inlet 70A side (second cooler 23 side) of the check valve 70 is at a higher temperature and pressure than on the outlet 70B side (first cooler 22 side). The valve body 73 of the check valve 70 is subjected to an upward displacement (lifting) force due to this pressure difference of refrigerant. If this upward displacement force of the valve body 73 exceeds the weight of the valve body 73, the valve body 73 will become levitated. In this case, the check valve 70 may generate abnormal noise due to vibration, etc.

[0037] Therefore, if a waiting period is provided during which the compressor 24 is not operated after the defrosting operation and refrigerant is not supplied to either of the coolers 22 or 23, the pressure difference of the refrigerant between the inlet 70A and outlet 70B of the check valve 70 will decrease, reducing the force that displaces (lifts) the valve body 73 upward. As a result, the force that displaces the valve body 73 upward will not exceed its own weight, and the valve body 73 will not become suspended. However, there is a concern that the temperature of the refrigerator compartment 12 and the freezer compartment 13 will rise during the waiting period, causing stored items (food, etc.) to deteriorate or thaw.

[0038] In contrast, the valve body 73 according to this embodiment is formed such that, when the cooling operation is resumed after the defrosting operation and the three-way valve 27 is operated to the first state (refrigeration ON and freezing OFF), it is displaced downward by its own weight, and the inlet end 73A contacts the projection 72A of the valve seat 72. In other words, the valve body 73 is formed with a large mass so that its own weight is increased. For example, the mass can be increased by increasing the size of the valve body 73 or by changing the material (for example, changing from resin to metal).

[0039] In this way, by using a check valve 70 with a simple configuration in which the valve body 73 is displaced, costs can be reduced, design and maintenance can be simplified, and the valve body 73 can be prevented from floating, thereby preventing the generation of abnormal noise due to vibration, etc. Furthermore, cooling can be performed immediately after defrosting without any waiting time. As a result, while suppressing abnormal noise from the check valve 70, it is possible to prevent the temperature of the refrigerator and cooling compartments from rising, which could lead to deterioration or thawing of stored goods (food, etc.).

[0040] Furthermore, when designing the mass of the valve body 73, it is preferable to consider the pressure difference between the inlet 70A and outlet 70B within the check valve 70, the type of refrigerant, and the threshold temperature for determining the end of the defrosting operation. This allows for suitable adjustments to be made so as not to adversely affect the cooling operation while suppressing abnormal noise.

[0041] <Other Embodiments> This technology is not limited to the embodiments described above and in the drawings, and the following embodiments, for example, are also included in the technical scope of this technology.

[0042] (1) The first defrosting means and the second defrosting means are not limited to the first defrosting heater 32 and the second defrosting heater 33, respectively. For example, when a so-called off-cycle defrosting method is adopted, the first internal fan 52 and the second internal fan 53 may also be used.

[0043] (2) This technology can be applied to equipment other than the refrigerated storage unit 10, as long as it is equipped with the refrigeration circuit 20 described above. [Explanation of Symbols]

[0044] 10: Cooling storage unit, 12: Refrigerated room (first storage room), 13: Freezer room (second storage room), 20X: Confluence point, 22: First cooler, 23: Second cooler, 24: Compressor, 25: Condenser, 27: Three-way valve, 60: Control unit, 70: Check valve, 70S: Clearance, 72: Valve seat, 73: Valve body, 74: Stopper

Claims

1. The first storage room and The second storage room, A first cooler for cooling the first storage chamber, A second cooler that cools the second storage chamber to a lower temperature than the first storage chamber, A compressor for compressing the refrigerants from the first cooler and the second cooler, the compressor being located downstream in the direction of refrigerant flow from the point where the refrigerants from the first cooler and the refrigerants from the second cooler merge, A check valve is provided between the confluence point and the second cooler to prevent refrigerant from the first cooler from flowing into the second cooler, A condenser that liquefies the refrigerant gas compressed by the compressor, A valve that switches the supply destination of the refrigerant from the condenser to at least one of the first cooler or the second cooler, A first defrosting means for melting frost adhering to the first cooler, A second defrosting means for melting frost adhering to the second cooler, It comprises a control unit and, The aforementioned check valve is, The device has a valve body that displaces according to the pressure difference between the refrigerant on the first cooler side and the refrigerant on the second cooler side, The valve body is configured to open and close the gap by being displaced. The direction of displacement of the valve body is along the vertical direction, and the gap is closed when the valve body is displaced downward. The control unit, The compressor is activated to perform a cooling operation. The compressor is stopped, and at least one of the first defrosting means or the second defrosting means is activated to perform a defrosting operation. Immediately after the defrosting operation, the compressor is activated to restart the cooling operation. The valve body of the check valve has a mass that is capable of being displaced downward by its own weight to close the gap when the valve is operated so that the refrigerant is supplied to the first cooler during the restarted cooling operation.

2. The aforementioned check valve is, A valve seat that forms the gap between itself and the valve body and contacts the valve body when it is displaced downward, The valve body is equipped with a stopper that comes into contact with the valve body when it is displaced upward, The cooling storage unit according to claim 1, wherein the valve body closes the gap by contacting the valve seat when the valve is operated so that a refrigerant is supplied to the first cooler in the restarted cooling operation.

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