JP2020071004A - Cooling storage cabinet - Google Patents

Abstract

To restrain dry air from moving toward a storage chamber.SOLUTION: A cooling storage cabinet comprises: a storage cabinet body 12 comprising a storage chamber 11; a compressor 25; a condenser 26; an expansion valve 30; a cooler 28; a refrigerant pipe 24 connecting the compressor 25, the condenser 26, the expansion valve 30, and the cooler 28 in this order in a circulating manner; a cooling fan 29; and a heat exchanger 45. The heat exchanger 45 comprises a first heat exchanger component part 43 and a second heat exchanger component part 44. The expansion valve 30 is arranged between an inlet side of the first heat exchange component part 43 and an outlet side of the condenser 26, and is constituted so as to be capable of evaporating a refrigerant in the first heat exchanger component part 43.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cold store.

  BACKGROUND ART Conventionally, as a cooling storage, one provided with a compressor, a condenser, and a cooler (evaporator) is known (Patent Document 1 below). In Patent Document 1, the refrigerant compressed by the compressor is liquefied by the condenser and then decompressed in the capillary tube, so that the refrigerant is evaporated in the cooler. Accordingly, the storage chamber can be cooled by supplying the air that has passed through the cooler by the cooling fan to the storage chamber.

JP-A-2002-195726

  In the process of the air passing through the cooler, dew condensation occurs on the surface of the cooler to dehumidify the air. In the configuration in which the cooling device evaporates the refrigerant as in the above configuration, the temperature of the cooling device decreases due to the heat of evaporation, and the amount of dehumidification of air when passing through the cooling device increases. As a result, there is a problem in that food and the like in the storage chamber are easily dried by supplying dry air to the storage chamber.

  The present invention has been completed based on the above situation, and an object thereof is to suppress a situation in which dry air goes to a storage chamber.

  In order to solve the above problems, a cooling storage of the present invention is a storage main body having a storage chamber, a compressor, a condenser, an expansion means, a cooler, the compressor, the condenser, the expansion means. A refrigerant pipe that circulates and connects the cooler in this order, a cooling fan that supplies air that has passed through the cooler to the storage chamber, and a heat exchanger. A portion connecting the outlet side and the inlet side of the cooler is referred to as a first pipe portion, and a portion of the refrigerant pipe connecting the outlet side of the cooler and the inlet side of the compressor is referred to as a second pipe portion. In such a case, the heat exchanger has a first heat exchanger component that is a pipe provided in the first pipe portion and a second heat exchanger component that is a pipe provided in the second pipe portion. And a cooling medium flowing through the first heat exchanger component and a cooling medium flowing through the second heat exchanger component. The expansion means is arranged between the inlet side of the first heat exchanger component and the outlet side of the condenser, and It is characterized in that the refrigerant can be evaporated in the one heat exchanger component.

  According to the above configuration, the refrigerant evaporates in the first heat exchanger component, so that the gaseous refrigerant is sent to the cooler. Therefore, it is possible to prevent the refrigerant from evaporating in the cooler, and it is possible to prevent the temperature of the cooler from decreasing due to heat of evaporation. As a result, it is possible to suppress a situation in which dew condensation occurs in the process of air passing through the cooler, and a situation in which dry air goes to the storage chamber.

  Further, the expansion means may be a thermal automatic expansion valve whose opening degree changes based on the temperature of the refrigerant at the outlet of the first heat exchanger component. Since the opening degree of the temperature type automatic expansion valve (the flow rate of the refrigerant to the first heat exchanger component) changes based on the temperature of the refrigerant at the outlet of the first heat exchanger component, the first heat exchanger configuration Since the evaporation amount of the refrigerant in the cooling unit can be controlled with higher accuracy, and the liquid refrigerant can be more reliably evaporated in the first heat exchanger component, the situation in which the liquid refrigerant is directed to the cooler Can be suppressed more reliably.

  Further, at least a part of the first heat exchanger component may be housed inside the second heat exchanger component. In the above configuration, since the refrigerant is evaporated in the first heat exchanger constituent part, the temperature of the first heat exchanger constituent part is lowered, but at least a part of the first heat exchanger constituent part is used as the second heat exchanger. By accommodating the heat exchanger inside the exchanger component, the portion of the first heat exchanger component that comes into contact with the outside air can be further reduced, and the occurrence of dew condensation on the surface of the first heat exchanger component can be suppressed. ..

  ADVANTAGE OF THE INVENTION According to this invention, the situation where dry air goes to a storage chamber can be suppressed.

Sectional drawing which shows the refrigerator which concerns on Embodiment 1 of this invention. Diagram showing the cooling cycle of the refrigerator Diagram showing heat exchanger The figure which shows the heat exchanger which concerns on Embodiment 2.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4. In this embodiment, a prefabricated refrigerator 10 is exemplified as the cooling storage. As shown in FIG. 1, the refrigerator 10 includes a storage main body 12 having a storage chamber 11 and a cooling device 13. The storage main body 12 (heat insulating box) is configured by assembling a plurality of heat insulating panels in a box shape. An opening 16 serving as a doorway is formed in the storage main body 12, and the opening 16 can be opened and closed by a heat insulating door 17.

  The cooling device 13 includes an outdoor unit 21, an indoor unit 22, a control box 23, and a refrigerant pipe 24 (see FIG. 2) that circulates and connects the outdoor unit 21 and the indoor unit 22. As shown in FIG. 2, the outdoor unit 21 includes a compressor 25, a condenser 26, and a condenser fan 27 for cooling the condenser 26. The indoor unit 22 includes a cooler 28, a cooling fan 29, an expansion valve 30 (expansion means), a heat exchanger 45, and a temperature sensing cylinder 33. The compressor 25, the condenser 26, the expansion valve 30, and the cooler 28 are circulated and connected in this order by a refrigerant pipe 24 in which a refrigerant is sealed. The control box 23 accommodates a control unit (not shown) that controls the operation of each device (the compressor 25, the condenser fan 27, the cooling fan 29, etc.) that configures the cooling device 13.

  The refrigerant pipe 24 is a portion that connects the outlet side of the condenser 26 and the inlet side of the cooler 28 (a portion between the outlet of the condenser 26 and the inlet of the cooler 28), and a first pipe portion 41, The second pipe portion 42 that is a portion (a portion between the outlet of the cooler 28 and the inlet of the compressor 25) that connects the outlet side of the cooler 28 and the inlet side of the compressor 25. The heat exchanger 45 includes a first heat exchanger component 43 which is a pipe provided in the first pipe part 41, a second heat exchanger component 44 which is a pipe provided in the second pipe part 42, Equipped with. In the present embodiment, the refrigerant circulates in the order of the compressor 25, the condenser 26, the expansion valve 30, the first heat exchanger component 43, the cooler 28, and the second heat exchanger component 44.

  As shown in FIG. 3, the first heat exchanger constituent part 43 and the second heat exchanger constituent part 44 are arranged adjacent to each other, and are provided so that their outer peripheral surfaces are in contact with each other. As a result, heat is exchanged between the refrigerant flowing through the first heat exchanger forming part 43 (and thus the first pipe part 41) and the refrigerant flowing through the second heat exchanger forming part 44 (and the second pipe part 42). It is possible to configure. By providing such a heat exchanger 45, it is possible to suppress the situation where the low-pressure refrigerant is liquefied and to suppress the situation where the liquid refrigerant is sucked into the compressor 25. The first heat exchanger component 43 and the second heat exchanger component 44 have, for example, larger inner diameters of the pipes than the first pipe portion 41 and the second pipe portion 42.

  The expansion valve 30 is provided in the refrigerant pipe 24 at a location near the inlet of the first heat exchanger component 43. That is, the expansion valve 30 is arranged between the inlet side of the first heat exchanger component 43 and the outlet side of the condenser 26. The expansion valve 30 has a configuration capable of evaporating a liquid refrigerant in the first heat exchanger component 43 by lowering the pressure of the refrigerant passing through. The expansion valve 30 is a temperature-type automatic expansion valve, and is connected to a temperature sensitive tube 33 provided in the refrigerant pipe 24 near the outlet of the first heat exchanger component 43.

  Although the configuration of the temperature-controlled automatic expansion valve is well known, the configuration of the expansion valve 30 is not shown, but the expansion valve 30 includes a diaphragm and a valve body that is displaced according to the displacement of the diaphragm. Is configured to change the opening degree of the expansion valve 30. The pressure of the refrigerant enclosed in the temperature sensing cylinder 33 (the temperature of the temperature sensing cylinder 33) acts on the diaphragm of the expansion valve 30, and the diaphragm is displaced according to the pressure. For this reason, the opening degree of the expansion valve 30 changes based on the temperature of the refrigerant at the outlet of the first heat exchanger component 43, so that the degree of superheat of the refrigerant flowing out of the first heat exchanger component 43 is predetermined. It is possible to control the target value of. When the temperature detected by the temperature sensitive tube 33 becomes low (the degree of superheat of the refrigerant in the first heat exchanger component 43 becomes low), the pressure acting on the diaphragm decreases and the opening degree of the expansion valve 30 decreases. .. When the opening degree of the expansion valve 30 decreases, the amount of the refrigerant flowing into the first heat exchanger component 43 decreases, and as the amount of the refrigerant decreases, the liquid refrigerant in the first heat exchanger component 43 becomes gaseous. Since it easily becomes a refrigerant, the degree of superheat becomes high.

  Further, the expansion valve 30 includes a spring that presses the diaphragm from the side opposite to the side of the temperature-sensitive cylinder 33 where the pressure acts, and a spindle (for superheat adjustment) that can adjust the pressing force of the spring that presses the diaphragm. Spindle), and. By adjusting the spindle of the expansion valve 30, it is possible to set the superheat degree (more specifically, the target value of the superheat degree) of the refrigerant flowing out from the first heat exchanger component 43. In the present embodiment, the pressing force of the spring of the expansion valve 30 (the target value of the degree of superheat of the refrigerant) is set in the first heat exchanger component 43 so that the liquid refrigerant evaporates. As a result, the high temperature and liquid refrigerant that has flowed into the expansion valve 30 is decompressed in the expansion valve 30 and is heat-exchanged with the refrigerant flowing in the second heat exchanger forming portion 44 in the first heat exchanger forming portion 43. , Becomes a low-temperature and gaseous refrigerant by evaporation, and goes to the cooler 28. In the cooler 28, the refrigerant exchanges heat with the air in the storage chamber 11. Therefore, the refrigerant in the second heat exchanger forming part 44 has a higher temperature than the refrigerant in the first heat exchanger forming part 43. As a result, the refrigerant in the first heat exchanger component 43 can be evaporated by heat exchange with the refrigerant in the second heat exchanger component 44, and the liquid refrigerant is directed to the cooler 28 and the compressor 25. It is possible to suppress the situation of being inhaled.

  The cooling fan 29 is adjacent to the cooler 28. By driving the cooling fan 29, the air in the storage chamber 11 is sucked into the indoor unit 22, and the air is cooled by exchanging heat with the low-temperature refrigerant in the cooler 28 while passing through the cooler 28. After that, the air that has passed through the cooler 28 is supplied to the storage chamber 11 (the flow of such air is shown by the arrow A1 in FIG. 1). By continuously circulating such air, the entire storage chamber 11 is cooled.

  Next, the effect of this embodiment will be described. In the present embodiment, since the refrigerant evaporates in the first heat exchanger component 43, the gaseous refrigerant is sent to the cooler 28. For this reason, it is possible to prevent the refrigerant from evaporating in the cooler 28, and it is possible to prevent the temperature of the cooler 28 from decreasing due to the heat of evaporation. As a result, it is possible to suppress the situation where dew condensation occurs in the process of the air passing through the cooler 28, and it is possible to suppress the situation where the dry air goes to the storage chamber 11. The refrigerator 10 of the present embodiment can cool the storage chamber 11 relatively slowly and can suppress the situation in which dry air goes to the storage chamber 11, and is therefore suitable for use as a constant temperature and high humidity chamber. ..

  According to an example of an experiment conducted by the inventor of the present application, when the set temperature in the storage chamber 11 is set to 0 ° C., the conventional configuration (the expansion valve 30 includes the first heat exchanger component 43 and the cooler) is used. It has been confirmed that the temperature of the cooler 28 becomes about minus 15 ° C. in the configuration in which the refrigerant is evaporated in the cooler 28 by installing it between the coolers 28. It has been confirmed that the temperature will be about -1 ° C. That is, in the configuration of the present embodiment, it was confirmed that the difference between the temperature inside the storage chamber 11 and the temperature of the cooler 28 was smaller.

  Further, in the present embodiment, a thermal automatic expansion valve whose opening degree changes based on the temperature of the refrigerant at the outlet of the first heat exchanger component 43 is used as the expansion means. Since the opening degree of the temperature type automatic expansion valve (the flow rate of the refrigerant to the first heat exchanger forming section 43) changes based on the temperature of the refrigerant at the outlet of the first heat exchanger forming section 43, the first heat exchange Since it is possible to control the evaporation amount of the refrigerant in the container component 43 with higher accuracy, and to more reliably evaporate the liquid refrigerant in the first heat exchanger component 43, the liquid in the cooler 28 can be controlled. It is possible to more reliably suppress the situation where the refrigerant goes to.

  Moreover, conventionally, brine that has been cooled outside the refrigerator is circulated and supplied to the cooler to keep the cooler temperature at the same level as the temperature inside the refrigerator, thereby suppressing condensation in the cooler and allowing dry air to go to the storage room. A cooling device capable of suppressing the above is known. In such a cooling device, in addition to a device for cooling the brine, a tank for storing the brine, a pump for pumping the brine to the cooler, and the like are required, which makes the device large-scale. .. On the other hand, in the present embodiment, the number of parts is almost the same as that of the conventional cooling device (the cooling device that evaporates the refrigerant in the cooler), and it suffices to change the position of the expansion valve 30. It is possible to suppress the situation in which the dried air is directed to the storage chamber 11 with a simpler configuration than that of the conventional cooling device.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the above-described embodiment are designated by the same reference numerals, and duplicate description will be omitted. In this embodiment, the structure of the heat exchanger is different from that of the above-described embodiments. As shown in FIG. 4, the heat exchanger 145 of the present embodiment has a double pipe structure in which the first heat exchanger component 143 is housed inside the second heat exchanger component 144. In the present embodiment, the expansion valve 30 is arranged on the front side of the first heat exchanger component 143, and the refrigerant is evaporated in the first heat exchanger component 143. Although the temperature will decrease, by accommodating the first heat exchanger component 143 inside the second heat exchanger component 144, the portion of the first heat exchanger component 143 that comes into contact with the outside air is reduced. Therefore, it is possible to suppress the occurrence of dew condensation on the surface of the first heat exchanger component 143. In addition, a part (for example, an end portion) of the first heat exchanger component 143 may be arranged outside the second heat exchanger component.

<Other Embodiments>
The present invention is not limited to the embodiments described by the above description and drawings, and the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the expansion valve 30 was used as the expansion means, but the expansion means is not limited to this. For example, a capillary tube may be used as the expansion means. The longer the capillary tube is, the easier the refrigerant is to evaporate in the first heat exchanger component. Further, the smaller the diameter of the capillary tube, the easier the refrigerant is to evaporate in the first heat exchanger component. Therefore, by appropriately setting the length and diameter of the capillary tube, it is possible to evaporate the refrigerant and prevent the liquid refrigerant from going to the cooler 28 in the first heat exchanger component.
(2) Further, as the expansion valve, a constant pressure automatic expansion valve or an electronic expansion valve may be used in addition to the temperature type automatic expansion valve. When using the electronic expansion valve, a temperature detecting means such as a thermistor is provided at the outlet of the first heat exchanger component, and the degree of superheat is controlled by controlling the opening degree of the electronic expansion valve based on the detected temperature. It is possible to control and evaporate the refrigerant in the first heat exchanger component.

10 ... Refrigerator (cooling storage), 11 ... Storage room, 12 ... Storage body, 24 ... Refrigerant pipe, 25 ... Compressor, 26 ... Condenser, 28 ... Cooler, 29 ... Cooling fan, 30 ... Expansion valve (expansion means) ), 41 ... First pipe part, 42 ... Second pipe part, 43, 143 ... First heat exchanger constituent part, 44, 144 ... Second heat exchanger constituent part, 45, 145 ... Heat exchanger

Claims (3)

A storage main body having a storage chamber,
A compressor,
A condenser,
Expansion means,
A cooler,
A refrigerant pipe that circulates and connects the compressor, the condenser, the expansion means, and the cooler in this order,
A cooling fan that supplies the air passing through the cooler to the storage chamber;
A heat exchanger,
A portion of the refrigerant pipe that connects the outlet side of the condenser and the inlet side of the cooler is defined as a first pipe portion, and the outlet side of the cooler and the inlet side of the compressor of the refrigerant pipe are connected to each other. When the connecting part is the second pipe part,
The heat exchanger includes a first heat exchanger component that is a pipe provided in the first pipe portion, and a second heat exchanger component that is a pipe provided in the second pipe portion. A configuration capable of exchanging heat between the refrigerant flowing through the first heat exchanger component and the refrigerant flowing through the second heat exchanger component,
The expansion means is arranged between the inlet side of the first heat exchanger component and the outlet side of the condenser and is capable of evaporating a refrigerant in the first heat exchanger component. Has become a cold storage.   The cooling storage according to claim 1, wherein the expansion unit is a temperature-type automatic expansion valve whose opening changes according to the temperature of the refrigerant at the outlet of the first heat exchanger component.   The cooling storage according to claim 1 or 2, wherein at least a part of the first heat exchanger component is housed inside the second heat exchanger component.

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