JP2009079837A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator capable of stably operating a refrigerating cycle, by minimizing heat leakage into a storage while preventing condensation. <P>SOLUTION: This refrigerator 1 has a thermal insulation box body 101 having an opening part, a thermal insulation partition part 110 for partitioning the inside of the thermal insulation box body 101 into a plurality of storage chambers, a thermal insulation door 120, a refrigerant pipe, a compressor 141, a condenser 144, and a first flow passage for making a refrigerant flow up to the condenser 144 from the compressor 141. The thermal insulation partition part 110 has a thermal insulation partition part front face 110a opposed to the thermal insulation door 120 when the thermal insulation door 120 blocks up the opening part, and also has a partition part condensation preventive pipe 143 for making the refrigerant flow to the periphery of the thermal insulation partition part front face 110a, and has a solenoid four-way valve 151 for switching whether or not the refrigerant is made to flow to the first flow passage or whether or not the refrigerant is made to flow up to the condenser 144 via the partition part condensation preventive pipe 143 from the compressor 141. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a refrigerator.

  Generally, a refrigerator is a refrigerator that includes a heat insulating box having an opening, a heat insulating door for opening and closing the opening of the heat insulating box, a refrigerator, a refrigerator, a condenser, a decompressor, an evaporator, etc. Composed of cycles. The heat insulating box body is filled with a heat insulating material such as polyurethane foam in the gap between the outer box and the inner box and the inside of the partition that partitions the inner box into a plurality of storage chambers.

  Among the devices constituting the refrigeration cycle, a part of the condenser is arranged as dew condensation preventing piping around the front surface of the opening of the heat insulating box and the front surface of the partition. In this way, the refrigerant is condensed in the dew condensation prevention pipe, and at the same time, the contact portion between the heat insulation box and the heat insulation door is heated by the high-temperature refrigerant, and the contact portion between the heat insulation box and the heat insulation door due to the temperature difference between inside and outside the chamber. To prevent condensation.

  However, in a refrigerator configured in this way, for example, when the environment where the refrigerator is installed is a low-humidity atmosphere, even when there is no condensation due to a temperature difference between the inside and the outside of the refrigerator, the heat insulation box and the heat insulation box are always insulated during the refrigeration cycle operation. The contact part of the door will be heated. The contact portion between the heat insulation box and the heat insulation door is a portion having a particularly large amount of heat leakage, and the heat of the refrigerant easily enters the refrigerator, so it cannot be said that the structure is efficient.

  In order to solve such a problem, for example, Japanese Patent Laid-Open No. 2000-65461 (Patent Document 1) detects a situation in which condensation occurs at a contact portion between a heat insulation box and a heat insulation door, and a situation in which condensation occurs. In the refrigerator, control is performed so that the high-temperature refrigerant from the condenser is guided to the dew condensation prevention pipe, and control is performed so that the high temperature refrigerant from the condenser is guided to a detour path that bypasses at least a part of the dew condensation prevention pipe in a situation where condensation does not occur. Is disclosed.

The refrigerator described in Japanese Patent Application Laid-Open No. 2000-65461 (Patent Document 1) has condensation provided in the vicinity of a contact portion with a heat insulating door of a heat insulating box by a part of piping between a condenser and a decompressor. A high-temperature refrigerant from the condenser is formed by forming a prevention pipe and guiding the high-temperature refrigerant from the condenser into the condensation prevention pipe and at the same time bypassing at least a part of the condensation prevention pipe to a part of the condensation prevention pipe. In this configuration, a detour path for guiding the refrigerant is provided, and means for switching the path through which the refrigerant flows according to the dew condensation state is provided.
JP 2000-65461 A

  However, as described above, in the refrigerator in which the dew condensation prevention pipe is branched from the main refrigeration cycle, and the flow path through which the refrigerant flows through the dew condensation prevention pipe and the flow path through the dew condensation prevention pipe can be switched according to the situation, When the refrigerant flow path is switched from the dew condensation prevention pipe to the bypass path, the refrigerant in the dew condensation prevention pipe is confined.

Here, for example, when the temperature at the outlet of the condensing unit is 40 ° C. (corresponding to an ambient temperature of about 30 ° C.), when isobutane refrigerant is used as the refrigerant, the pressure inside the condensing unit corresponds to 0.531 MPa. To do. The density of the saturated liquid at 0.531 MPa is 531.2 kg / m ³ , and the density of the saturated vapor is 13.7 kg / m ³ .

When the inner diameter of the anti-condensation pipe is 3.1 mm and the length is 3 m, the internal volume of the anti-condensation pipe is π × (0.0031 m / 2) ² × 3 m = 2.3 × 10 ⁻⁵ m ^3. . When the inside of the dew condensation prevention pipe is 100% gas, the maximum amount of refrigerant contained in the inside is 13.7 kg / m ³ × 2.3 × 10 ⁻⁵ m ³ = 0.0003 kg = 0.3 g.

On the other hand, when the refrigerant is all liquid, the maximum amount of refrigerant staying in the dew condensation prevention pipe is 531.2 kg / m ³ × 2.3 × 10 ⁻⁵ m ³ = 0.012 kg = 12 g. Become.

  Therefore, when the condensation prevention pipe is arranged on the downstream side of the condensing unit, when the refrigerant flow path is switched so that the refrigerant flows through the condensation prevention pipe, for example, when the dryness of the refrigerant is 50%, the condensation prevention pipe It is considered that approximately 6 g of refrigerant stays inside.

  The amount of refrigerant sealed in the refrigeration cycle in the home refrigerator is about 40 to 60 g. In the above case, the amount of the refrigerant in the refrigeration cycle fluctuates by 10% or more due to the switching of the refrigerant flow path, and the possibility of falling into the insufficient refrigerant phenomenon is sufficiently considered.

  That is, in the conventional refrigerator, since the dew condensation prevention pipe is arranged between the condenser and the decompressor, the refrigerant flowing through the dew condensation prevention pipe is condensed by the condenser and is in the state of wet steam or saturated liquid, that is, It is thought that it contains a little liquid refrigerant. If the refrigerant flow path is switched from the dew condensation prevention pipe to the detour path according to the dew condensation state, the liquid refrigerant may stay in the dew condensation prevention pipe and the refrigeration cycle may run out of refrigerant, resulting in a slow cooling state.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a refrigerator capable of operating a refrigeration cycle stably while minimizing heat intrusion into the warehouse while preventing condensation.

  A refrigerator according to the present invention includes a heat insulating box having an opening, a heat insulating partition for dividing the inside of the heat insulating box into a plurality of storage rooms, and a heat insulating door for opening and closing the opening of the heat insulating box. , A refrigerant pipe for circulating the refrigerant, a compressor for compressing the refrigerant flowing through the refrigerant pipe, a condensing part for condensing the refrigerant compressed by the compressor, and compressing the refrigerant compressed by the compressor A first flow path for circulating from the machine to the condensing unit, and the heat insulating partition has a front surface of the heat insulating partition facing the heat insulating door when the heat insulating door closes the opening, and A second flow path for circulating the refrigerant around the front surface of the heat insulating partition is provided, and the refrigerant is circulated through the first flow path, or the refrigerant is passed from the compressor to the condenser through the second flow path. A refrigerant flow path switching unit for switching whether to circulate is provided.

  In the refrigerator according to the present invention, the second flow path is provided between the compressor and the condensing unit, not on the downstream side of the condensing unit. Can be allowed to flow for a minimum amount of time according to the dew condensation around the contact area between the heat insulation box and the heat insulation door, so that heat intrusion into the storage room can be minimized while preventing dew condensation. it can.

  By disposing a second flow path that guides the refrigerant around the front surface of the heat insulating partition between the compressor and the condenser, not downstream of the condenser, before the refrigerant becomes a gas-liquid phase, that is, It flows in the second flow path in the state of superheated steam, dry saturated steam, or wet steam very close to dry saturated steam. Therefore, even when the refrigerant flow path is switched from a path through which the refrigerant flows through the second flow path to a path that bypasses the second flow path, the amount of refrigerant remaining in the second flow path is minimized. Since it can be stopped, a shortage of refrigerant in the refrigeration cycle can be prevented.

  In the second flow path, the compressed refrigerant immediately after being discharged from the compressor flows, resulting in a high temperature. However, by appropriately switching the refrigerant flow path to the first flow path, The surroundings are not heated too much, and the heat intrusion into the refrigerator does not increase as compared with the prior art.

  By doing in this way, the refrigerator which can suppress the heat | fever penetration | invasion in a store | warehouse | chamber while preventing condensation and can operate a refrigeration cycle stably can be provided.

  In the refrigerator according to the present invention, the refrigerant flow switching unit causes the refrigerant to flow through the first flow path, or causes the refrigerant to flow through the first flow path and from the compressor to the second flow path. It is preferable that it is a refrigerant flow path switching part for switching whether a refrigerant | coolant is distribute | circulated to the said condensation part through this flow path.

  In this way, the first flow path is always open even when a problem occurs in the refrigerant flow path switching unit and the refrigerant does not flow through the second flow path. The refrigerant circulation inside is maintained and does not affect the cooling performance of the refrigerator itself. Further, for example, even when a valve having a low opening degree is used as the refrigerant flow path switching unit, the refrigerant flow path switching unit can be arranged in the second flow path, so that the refrigerant flows only in the first flow path. Since the refrigerant does not pass through the refrigerant flow path switching unit, there is no pressure loss, and a decrease in cooling efficiency can be suppressed.

  The refrigerator according to the present invention includes an auxiliary heat radiating unit that is disposed between the compressor and the condensing unit to dissipate the refrigerant, and the auxiliary heat radiating unit is disposed between the compressor and the refrigerant flow switching unit. It is preferable that

  By doing in this way, since the vibration which arises by the driving | operation of a compressor, a stop, etc. is absorbed in an auxiliary | assistant heat radiation part, without transmitting directly to a refrigerant | coolant flow path switching part, the noise at the time of a refrigerator driving | operation can be reduced.

  In addition, since the refrigerant hardly condenses in the auxiliary heat radiating section, the refrigerant flowing in the second flow path is in the state of superheated steam, dry saturated steam, or wet steam very close to dry saturated steam. Even when the path is switched to the first flow path, the amount of refrigerant staying in the second flow path can be kept to a minimum, and refrigerant shortage in the refrigeration cycle can be prevented.

  In addition, the refrigerant flow path is appropriately switched to the second flow path or the first flow path, so that the periphery of the front surface of the heat insulating partition is heated too much, or heat intrusion into the refrigerator is increased compared to the conventional case. There is nothing.

  In the refrigerator according to the present invention, the heat insulating box has an opening front surface facing the heat insulating door when the heat insulating door closes the opening, and the condensing portion is arranged around the front of the opening. It is preferable to include a third flow path for circulating the refrigerant on the wall surface of the heat insulation box.

  Of the front surface of the box opening and the front surface of the heat insulating partition, which are the contact portions between the heat insulating box and the heat insulating door, the second channel is provided on the front surface of the heat insulating partition which is susceptible to condensation due to a temperature difference between the inside and outside of the refrigerator. There is no temperature difference between the inside and outside of the chamber and the condensation opening is less likely to condense on the front of the heat insulation partition. By providing the third flow path as a part, the front surface of the heat insulating box opening is not excessively heated, and heat intrusion into the refrigerator can be reduced.

  In the refrigerator according to the present invention, it is preferable that at least one of the first channel and the second channel has a refrigerant backflow prevention valve for preventing the backflow of the refrigerant.

  By doing so, the refrigerant does not run back and stay in the flow path of the second flow path and the first flow path that does not require the flow of the refrigerant, and the refrigerant does not become insufficient. A stable refrigeration cycle can be operated.

  The refrigerator according to the present invention includes the operating state of the refrigerator, the temperature inside the heat insulating box, the temperature around the front of the opening, the temperature around the front of the heat insulating partition, the temperature around the refrigerator, and the refrigerator Based on the detection state for detecting at least one of the ambient humidity and the detection result of the detection unit, based on the state of condensation around the contact portion between the heat insulation box and the heat insulation door, the refrigerant flow path It is preferable to include a control unit configured to control the switching unit.

  By doing in this way, since the refrigerant can flow to the front surface of the heat insulation partition only in the situation where the periphery of the contact portion between the heat insulation box and the heat insulation door is condensed, the area around the contact portion between the heat insulation box and the heat insulation door is more than necessary. Without heating, the heat intrusion into the chamber can be minimized.

  As described above, according to the present invention, it is possible to provide a refrigerator capable of minimizing heat intrusion into the cabinet while preventing condensation and stably operating the refrigeration cycle.

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

(First embodiment)
FIG. 1 is a side sectional view showing a schematic configuration of a refrigerator as a first embodiment of the present invention. In FIG. 1, the left side of the figure is the front of the refrigerator, and the right side of the figure is the back of the refrigerator.

  As shown in FIG. 1, the refrigerator 1 includes a heat insulating box 101 having an opening, a refrigerator compartment 102, a first freezer compartment 103, a second freezer compartment 104, vegetables, with the inside of the heat insulating box 101 serving as a plurality of storage rooms. A heat insulating partition 110 for partitioning into the chamber 105, a heat insulating door 120 for opening and closing the opening of the heat insulating box 101, and a machine room 106 formed in the lower back of the refrigerator 1 inside the heat insulating box 101, , Equipped with a refrigeration cycle. Inside the machine room 106, a compressor 141, a control device 130 as a control unit, an electromagnetic four-way valve 151 as a refrigerant flow path switching unit, and the like are arranged. Inside the heat insulating box 101, an outside air temperature / humidity sensor 161 is disposed as a detection unit for detecting the temperature and humidity around the refrigerator 1 at the upper back of the refrigerator 1. In addition to the inside of the heat insulation box 101, a compressor operation state detection unit as a detection unit for detecting the starting state of the compressor 141 as the operation state of the refrigerator 1 and a cold air passage for opening and closing A damper device operation state detection unit or the like as a detection unit for detecting an operation state of a damper device (not shown) is disposed.

  A door packing 125 is disposed around the heat insulating door 120. When the opening of the heat insulating box 101 is closed by the heat insulating door 120, the heat insulating door 120 comes into contact with the opening front surface 101a and the heat insulating partition front surface 110a via the door packing 125. The refrigerant is circulated around the heat insulating partitioning part front surface 110a by the partitioning part dew condensation prevention piping 143. The refrigerant is circulated around the opening front surface 101a by the opening dew condensation prevention pipe 145.

  FIG. 2 is a perspective view showing the configuration of the piping of the refrigerator. In FIG. 2, for the sake of explanation, some piping / devices are projected from the refrigerator main body. FIG. 3 is a configuration diagram showing the configuration of the refrigeration cycle of the refrigerator. The one-dot chain line arrow in the figure indicates the direction in which the refrigerant flows.

  As shown in FIG. 2, the refrigerator 1 includes a refrigeration cycle 140 and an electromagnetic four-way valve 151 inside a heat insulating box 101.

  As shown in FIG. 2 and FIG. 3, the refrigeration cycle 140 of the refrigerator 1 includes a compressor 141, an auxiliary radiator 142 as an auxiliary radiator, a partition dew condensation prevention pipe 143 as a second channel, and a condenser A condenser 144, a decompressor 146, and an evaporator 147 are connected in a ring shape. A part of the condenser 144 forms an opening dew condensation prevention pipe 145 as a third flow path. The opening dew condensation prevention pipe 145 is arranged at a certain distance from the opening front surface 101a. A dryer 148 is disposed between the condenser 144 and the decompressor 146.

  An electromagnetic four-way valve 151 is provided between the auxiliary radiator 142 and the condenser 144. The electromagnetic four-way valve 151 causes the refrigerant to flow from the compressor 141 to the condenser 144 without passing through the partitioning portion condensation prevention piping 143 as a first flow path, or from the compressor 141 via the partitioning portion condensation prevention piping 143. Switch whether the refrigerant flows to the condensing part. The refrigerant compressed by the compressor 141 and having passed through the auxiliary radiator 142 flows into the partition dew condensation prevention pipe 143 by the electromagnetic four-way valve 151 or does not flow into the partition dew condensation prevention pipe 143, but the auxiliary radiator 142. To flow into the condenser 144.

  As shown in FIG. 3A, when the electromagnetic four-way valve 151 is switched so that the refrigerant flows from the compressor 141 to the condenser 144 without passing through the partition dew condensation prevention pipe 143, the refrigerant Flows in the order of the compressor 141, the auxiliary radiator 142, the condenser 144, the decompressor 146, and the evaporator 147. In this case, the refrigerant does not flow through the partition dew condensation prevention pipe 143.

  As shown in FIG. 3B, when the electromagnetic four-way valve 151 is switched so that the refrigerant flows from the compressor 141 to the condenser 144 through the partitioning portion dew condensation prevention pipe 143, the refrigerant is compressed. Machine 141, auxiliary radiator 142, partition dew condensation prevention pipe 143, condenser 144, decompressor 146, and evaporator 147. Since the partition dew condensation prevention pipe 143 is disposed around the heat insulating partition front surface 110a (FIG. 1), when the high-temperature refrigerant flows through the partition dew condensation prevention pipe 143, the temperature of the partition dew condensation prevention pipe 143 is increased. The temperature of the door packing 125 (FIG. 1) in contact with the heat insulating partition front surface 110a (FIG. 1) rises, and the temperature of the heat insulating partition front surface 110a increases to prevent dew condensation.

  FIG. 4 is a block diagram showing a control-related configuration according to the first embodiment of the present invention.

  As shown in FIG. 4, the outside air temperature / humidity sensor 161, the compressor operation state detection unit 162, and the damper device operation state detection unit 163 transmit a control signal to the control device 130. Based on the control signals received from the outside air temperature / humidity sensor 161, the compressor operation state detection unit 162, and the damper device operation state detection unit 163, the control device 130 controls the opening front surface 101a and the heat insulating partition unit front surface 110a. The state of condensation is judged and a control signal is transmitted to the electromagnetic four-way valve 151. Thus, the electromagnetic four-way valve 151 is controlled by the control device 130 based on the dew condensation state between the opening front surface 101a and the heat insulating partition front surface 110a.

  The controller 130 determines the state of dew condensation between the opening front surface 101a and the heat insulating partition front surface 110a, and controls the electromagnetic four-way valve 151 so that the refrigerant flows through the partition dew condensation prevention pipe 143. A refrigerant having a temperature higher than room temperature flows from the auxiliary radiator 142 into the interior, and condensation on the opening front surface 101a and the heat insulating partition front surface 110a can be prevented.

  On the other hand, by controlling the electromagnetic four-way valve 151 so that the refrigerant does not flow into the partition dew condensation prevention pipe 143, the refrigerant bypasses the partition dew condensation prevention pipe 143 and flows into the condenser 144 from the auxiliary radiator 142. . By doing in this way, since a refrigerant having a temperature higher than room temperature does not flow in the partition dew condensation prevention pipe 143, heat entry from the heat insulating partition front surface 110 a into the refrigerator 1 when the prevention of dew condensation is unnecessary. Can be reduced.

  If a valve such as the electromagnetic four-way valve 151 is disposed immediately after the compressor 141, the valve directly receives the vibration of the compressor 141. Accordingly, the refrigerant pipe is branched into the partition dew condensation prevention pipe 143 on the downstream side of the auxiliary radiator 142 provided on the back surface of the heat insulating box body 101 of the refrigerator 1, and the electromagnetic four-way valve 151 is disposed at the branch point. The vibration of 141 is not directly transmitted to the valve, and a high-quality refrigerator 1 can be obtained.

  However, the partition dew condensation prevention pipe 143 is arranged not immediately after the compressor 141 but on the downstream side of the auxiliary radiator 142, so that the refrigerant that has radiated heat in the auxiliary radiator 142 flows into the partition dew condensation prevention pipe 143. . Moreover, the opening part front surface 101a and the heat insulation partition part front surface 110a of the heat insulation box 101 are cooled by the cool air in the refrigerator 1, and the partition part dew condensation prevention piping located inside the opening part front surface 101a and the heat insulation partition part front surface 110a. At 143, the refrigerant is deprived of heat. Therefore, when the partitioning part dew condensation prevention pipe 143 is arranged on the downstream side of the auxiliary radiator 142, the auxiliary radiator 142 is not provided, and the electromagnetic four-way valve 151 is arranged immediately after the compressor 141 to provide the partitioning part condensation prevention pipe. The temperature of the refrigerant flowing through the partition dew condensation prevention pipe 143 is lower than when the refrigerant is guided to 143. Therefore, in the first embodiment, even when the electromagnetic four-way valve 151 is controlled to introduce the refrigerant into the partition dew condensation prevention pipe 143 (when turned on), the refrigerant in the partition dew condensation prevention pipe 143 is in the gas-liquid two-phase. The heat radiation amount of the auxiliary radiator 142, the partition dew condensation prevention piping 143, and the condenser 144 is set so as to be a gas phase rather than a region. When the electromagnetic four-way valve 151 is switched so that the refrigerant is not introduced into the partition dew condensation prevention pipe 143 (when off), the refrigerant is confined inside the partition dew condensation prevention pipe 143, but the gas phase is made to be a gas phase. Therefore, the mass of the trapped refrigerant is small, and there is no possibility that the refrigeration cycle 140 becomes an insufficient refrigerant.

  As described above, the refrigerator 1 includes a heat insulating box 101 having an opening, and a heat insulating partition for dividing the inside of the heat insulating box 101 into a refrigerator compartment 102, a first freezer compartment 103, a second freezer compartment 104, and a vegetable compartment 105. Part 110, heat insulating door 120 for opening and closing the opening of heat insulating box 101, refrigerant piping for circulating the refrigerant, compressor 141 for compressing the refrigerant flowing through the refrigerant piping, and compressor 141 The heat insulating partition 110 includes a condenser 144 for condensing the compressed refrigerant and a first flow path for circulating the refrigerant compressed by the compressor 141 from the compressor 141 to the condenser 144. When the heat insulating door 120 closes the opening, the heat insulating partition front surface 110a facing the heat insulating door 120 is provided, and the partition portion dew condensation prevention piping 143 for circulating the refrigerant around the heat insulating partition front surface 110a is provided. Provided, comprising or circulating the refrigerant in the first flow channel, or, the solenoid four-way valve 151 for switching whether to distribute refrigerant from the compressor 141 to the condenser 144 via a partition portion condensation prevention pipe 143.

  In the refrigerator 1 of the present invention, the partition portion dew condensation prevention piping 143 is provided between the compressor 141 and the condenser 144, not on the downstream side of the condenser 144. Since the high-temperature refrigerant in a substantially vapor state can be allowed to flow for a necessary minimum time according to the dew condensation state around the contact portion between the heat insulation box 101 and the heat insulation door 120, heat to the storage chamber can be prevented while preventing dew condensation. Intrusion can be minimized.

  By arranging the partition dew condensation prevention pipe 143 that guides the refrigerant around the heat insulating partition front surface 110a, not between the compressor 141 and the condenser 144, but on the downstream side of the condenser 144, the refrigerant becomes a gas-liquid phase. Before, that is, in the state of superheated steam, dry saturated steam, or wet steam very close to dry saturated steam, it flows in the partition dew condensation prevention pipe 143. Therefore, even when the refrigerant flow path is switched from a path through which the refrigerant flows through the partitioning section dew condensation prevention pipe 143 to a path that bypasses the partitioning section dew condensation prevention pipe 143, the amount of the refrigerant staying in the partitioning section dew condensation prevention pipe 143 is reduced. Since it can be kept to a minimum, a shortage of refrigerant in the refrigeration cycle 140 can be prevented.

  The partition dew condensation prevention pipe 143 has a high temperature because the compressed refrigerant immediately after being discharged from the compressor 141 flows, but by appropriately switching the refrigerant channel to the first channel, the heat insulating partition unit The area around the front surface of 110 is not heated too much, and the heat intrusion into the refrigerator 1 does not increase as compared with the prior art.

  By doing in this way, the refrigerator 1 which can suppress the heat | fever penetration | invasion to the inside of a store | warehouse | chamber while preventing condensation and can operate the refrigerating cycle 140 stably can be provided.

  In addition, as described above, the refrigerator 1 according to the first embodiment includes the auxiliary radiator 142 that is disposed between the compressor 141 and the condenser 144 to dissipate the refrigerant, and the auxiliary radiator 142 includes the compressor 141. And the electromagnetic four-way valve 151.

  By doing in this way, since the vibration generated by the operation, stop, etc. of the compressor 141 is absorbed by the auxiliary radiator 142 without being directly transmitted to the electromagnetic four-way valve 151, noise during operation of the refrigerator 1 can be reduced. it can.

  In addition, since the refrigerant hardly condenses in the auxiliary radiator 142, the refrigerant flowing in the partition dew condensation prevention pipe 143 is in the state of superheated steam, dry saturated steam, or wet steam very close to dry saturated steam, Even when the refrigerant flow path is switched to the first flow path, the amount of refrigerant staying in the partition dew condensation prevention pipe 143 can be kept to a minimum, and the refrigerant shortage in the refrigeration cycle 140 can be prevented.

  In addition, the refrigerant flow path is appropriately switched to the partition dew condensation prevention pipe 143 or the first flow path, so that the heat insulating partition front surface 110a periphery is heated too much, or the heat intrusion into the refrigerator 1 is increased compared to the prior art. There is nothing to do.

  In this way, in the refrigerator 1 of the first embodiment, the heat insulating box 101 has the opening front surface 101a that faces the heat insulating door 120 when the heat insulating door 120 closes the opening, and the condensing part is It includes an opening dew condensation prevention pipe 145 for circulating the refrigerant on the wall surface of the heat insulating box 101 disposed around the opening front surface 101a.

  Among the box opening front surface 101a and the heat insulating partition front surface 110a, which are the contact portions between the heat insulating box 101 and the heat insulating door 120, the heat insulating partition front surface 110a that is particularly susceptible to condensation due to a temperature difference inside and outside the refrigerator 1 There is a partition dew condensation prevention piping 143, and the heat insulation partition front surface 110a does not cause a temperature difference between the inside and outside of the box, and the box opening front surface 101a is not easily dewed. By providing the opening dew condensation prevention pipe 145 as a part of the condenser 144 on the wall surface of the box around the 101a, the heat insulation box 101 opening front surface 101a is not excessively heated, and the heat into the refrigerator 1 is prevented. Intrusion can be reduced.

  Also, as described above, the refrigerator 1 of the first embodiment includes the operating state of the refrigerator 1, the temperature inside the heat insulating box 101, the temperature around the opening front surface 101a, the temperature around the heat insulating partition front surface 110a, Of the ambient temperature of the refrigerator 1 and the ambient humidity of the refrigerator 1, the ambient temperature and humidity sensor 161 for detecting the ambient temperature of the refrigerator 1 and the ambient humidity of the refrigerator 1, A compressor operation state detection unit 162 for detecting the operation state of the compressor as the operation state of the refrigerator 1, a damper device operation state detection unit 163 for detecting the state of the damper device as the operation state of the refrigerator 1, Based on the detection results of the outside air temperature / humidity sensor 161, the compressor operation state detection unit 162, and the damper device operation state detection unit 163, the periphery of the contact portion between the heat insulation box 101 and the heat insulation door 120 Based on the state of condensation, and a control unit 130 that is configured to control the electromagnetic four-way valve 151.

  By doing in this way, since a refrigerant can be flowed to the heat insulation partitioning part front surface 110a only in the situation where the periphery of the contact portion between the heat insulation box 101 and the heat insulation door 120 is condensed, the heat insulation box 101 and the heat insulation door 120 are more than necessary. No heat intrusion into the cabinet can be suppressed to a minimum without heating the periphery of the contact portion.

(Second Embodiment)
FIG. 5 is a perspective view showing the structure of the piping of the refrigerator as the second embodiment of the present invention. In FIG. 5, for the sake of explanation, some piping / devices are projected from the refrigerator main body. FIG. 6 is a configuration diagram showing the configuration of the refrigeration cycle of the refrigerator. The one-dot chain line arrow in the figure indicates the direction in which the refrigerant flows.

  As shown in FIG. 5, the refrigerator 2 of the second embodiment includes a refrigeration cycle 240, an electromagnetic valve 251, and a refrigerant backflow prevention valve 252 inside the heat insulating box body 101. The refrigerator 2 of 2nd Embodiment is provided with a heat insulation door, door packing, a machine room, etc. similarly to the refrigerator 1 of 1st Embodiment shown in FIG.

  As shown in FIG. 5 and FIG. 6, the refrigeration cycle 240 of the refrigerator 2 includes a compressor 241, a partition unit condensation including an auxiliary radiator 242 as an auxiliary heat dissipation unit, and a partition unit condensation prevention pipe 243 as a second channel. The prevention path 240b, the bypass path 240a that does not include the partition dew condensation prevention pipe 243, the condenser 244, the decompressor 246, and the evaporator 247 as a condensing part are connected in a ring shape. A part of the condenser 244 forms an opening dew condensation prevention pipe 245 as a third flow path. The opening dew condensation prevention pipe 245 is arranged at a certain distance from the opening front surface 101a. A dryer 248 is disposed between the condenser 244 and the decompressor 246. A refrigerant backflow prevention valve 252 is disposed on the downstream side of the partition dew condensation prevention pipe 243 in the partition dew condensation prevention path 240b. The refrigerant backflow prevention valve 252 prevents the refrigerant flowing through the partition dew condensation prevention path 240b from flowing back.

  An electromagnetic valve 251 is provided in the partition dew condensation prevention path 240b. The electromagnetic valve 251 switches whether the refrigerant is circulated through the partitioning part dew condensation preventing pipe 243 that circulates the refrigerant from the compressor 241 through the partitioning part dew condensation preventing pipe 243 to the condenser 244. The refrigerant compressed by the compressor 241 and passed through the auxiliary radiator 242 flows from the auxiliary radiator 242 into the partition dew condensation prevention path 240b or does not flow into the partition dew condensation prevention path 240b by the electromagnetic valve 251, It is possible to switch whether to flow through the first flow path that flows from the auxiliary radiator 242 to the condenser 244 through the detour path 240a.

  When the solenoid valve 251 is switched so that the refrigerant flows from the compressor 241 to the condenser 244 without passing through the partitioning dew condensation prevention path 240b, the refrigerant is the compressor 241, the auxiliary radiator 242, and the bypass. It flows through the path 240a, the condenser 244, the decompressor 246, and the evaporator 247 in this order. In this case, the refrigerant does not flow through the partition dew condensation prevention pipe 243.

  On the other hand, when the electromagnetic valve 251 is opened so that the refrigerant flows from the compressor 241 to the condenser 244 through the partitioning part dew condensation prevention path 240b, a part of the refrigerant passes through the bypass path 240a and is partitioned. It flows from the auxiliary radiator 242 to the condenser 244 without passing through the partial condensation prevention pipe 243. The remaining refrigerant flows in the order of the compressor 241, the auxiliary radiator 242, the partition dew condensation prevention pipe 243 of the partition dew condensation prevention path 240b, the condenser 244, the decompressor 246, and the evaporator 247. Since the partition dew condensation prevention pipe 243 is arranged around the front surface of the heat insulation partition, the refrigerant flows into the partition dew condensation prevention pipe 243, whereby the temperature of the partition dew condensation prevention pipe 243 rises and the front of the heat insulation partition part. The temperature of the door packing in contact with 110a rises, and the temperature of the heat insulating partition front surface 110a rises, thereby preventing the occurrence of condensation.

  FIG. 7 is a block diagram showing a control-related configuration according to the second embodiment of the present invention.

  As shown in FIG. 7, the outside air temperature / humidity sensor 261, the compressor operation state detection unit 262, and the damper device operation state detection unit 263 transmit a control signal to the control device 230. Based on the control signals received from the outside air temperature / humidity sensor 261, the compressor operation state detection unit 262, and the damper device operation state detection unit 263, the control device 230 and the opening front surface 101 a (FIG. 5) The state of condensation on the front surface 110a (FIG. 5) is determined, and a control signal is transmitted to the electromagnetic valve 251. Thus, the solenoid valve 251 is controlled by the control device 230 based on the dew condensation state between the opening front surface 101a and the heat insulating partition front surface 110a.

  The controller 230 determines the state of dew condensation between the opening front surface 101a and the heat insulating partition front surface 110a, and controls the solenoid valve 251 to open so that the refrigerant flows through the partition dew condensation prevention pipe 243. A refrigerant having a temperature higher than room temperature flows from the auxiliary radiator 242 into the prevention pipe 243, and condensation on the front surface 101a of the opening and the front surface 110a of the heat insulating partition can be prevented.

  On the other hand, by controlling the solenoid valve 251 to be closed so that the refrigerant does not flow through the partition dew condensation prevention path 240b, the refrigerant bypasses the partition dew condensation prevention pipe 243 and is bypassed from the auxiliary radiator 242. Through the condenser 244. By doing in this way, a refrigerant having a temperature higher than room temperature does not flow in the partition dew condensation prevention pipe 243. Therefore, when it is not necessary to prevent condensation, heat enters the refrigerator 2 from the heat insulating partition front surface 110a. Can be reduced.

  If a valve such as the electromagnetic valve 251 is disposed immediately after the compressor 241, the valve directly receives the vibration of the compressor 241. Therefore, the refrigerant pipe is branched on the downstream side of the auxiliary radiator 242 provided on the back surface of the heat insulating box 101 of the refrigerator 2, so that the vibration of the compressor 241 is not directly transmitted to the valve, and the high-quality refrigerator 2 is obtained. be able to.

  However, the partition dew condensation prevention path 240b is arranged not immediately after the compressor 241 but on the downstream side of the auxiliary radiator 242 so that the refrigerant radiated heat in the auxiliary radiator 242 flows into the partition dew condensation prevention path 240b. . Moreover, the opening part front surface 101a and the heat insulation partition part front surface 110a of the heat insulation box 101 are cooled by the cold in the refrigerator 2, and the partition part dew condensation prevention path located inside the opening part front surface 101a and the heat insulation partition part front surface 110a At 240b, the refrigerant is deprived of heat. Therefore, when the partitioning part dew condensation prevention path 240b is arranged on the downstream side of the auxiliary radiator 242, the auxiliary heatsink 242 is not provided and the electromagnetic valve 251 is arranged immediately after the compressor 241 and the partitioning part condensation prevention path 240b is provided. The temperature of the refrigerant flowing through the partition dew condensation prevention path 240b is lower than when the refrigerant is guided to the bottom. Therefore, in the second embodiment, even when the solenoid valve 251 is controlled to introduce the refrigerant into the partition dew condensation prevention path 240b (when on), the refrigerant in the partition dew condensation prevention path 240b is in the gas-liquid two-phase region. Instead, the heat radiation amounts of the auxiliary radiator 242, the partition dew condensation prevention path 240b, and the condenser 244 are set so as to be in the gas phase. When the solenoid valve 251 is switched so that the refrigerant is not introduced into the partition dew condensation prevention path 240b (when off), the refrigerant is confined inside the partition dew condensation prevention path 240b. Therefore, the mass of the trapped refrigerant is small and the refrigeration cycle 240 does not become a shortage refrigerant.

  Thus, according to the refrigerator 2 of 2nd Embodiment, piping which comprises the refrigerating cycle 240 is a refrigerant | coolant to both the flow path which flows a refrigerant | coolant only to the detour path 240a, and the partition part dew condensation prevention path 240b and the detour path 240a. Can be switched.

  As described above, in the refrigerator 2 of the second embodiment, the solenoid valve 251 causes the refrigerant to flow through the bypass path 240a, or allows the refrigerant to flow through the bypass path 240a and from the compressor 241 to the partition portion dew condensation prevention path 240b. It is the solenoid valve 251 for switching whether a refrigerant | coolant is distribute | circulated to the condenser 244 through this.

  By doing so, a malfunction occurs in the electromagnetic valve 251, and the bypass path 240 a is always open even in a situation where the refrigerant does not flow into the partition dew condensation prevention path 240 b. Refrigerant circulation is maintained and does not affect the cooling performance of the refrigerator 2 itself. Furthermore, since the electromagnetic valve 251 can be disposed in the partitioning portion dew condensation prevention path 240b, even when a valve having a low opening degree is used as the electromagnetic valve 251, when the refrigerant flows only in the detour path 240a, the refrigerant flows into the electromagnetic valve 251. Since there is no pressure loss, it is possible to suppress a decrease in cooling efficiency.

  As described above, in the refrigerator 2 of the second embodiment, the partition dew condensation prevention path 240b includes the refrigerant backflow prevention valve 252 for preventing the refrigerant backflow.

  By doing so, the refrigerant does not run back or stay in the flow path of the partitioning part dew condensation prevention path 240b and the bypass path 240a that does not need to flow the refrigerant, and there is no shortage of refrigerant. A stable refrigeration cycle 240 can be operated.

  The embodiment disclosed above should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above embodiment but by the scope of claims, and includes all modifications and variations within the meaning and scope equivalent to the scope of claims.

1 is a side cross-sectional view showing a schematic configuration of a refrigerator as a first embodiment of the present invention. It is a perspective view which shows the structure of piping of a refrigerator. It is a block diagram which shows the structure of the refrigerating cycle of a refrigerator. It is a block diagram which shows the structure relevant to the control which concerns on 1st Embodiment of this invention. It is a perspective view which shows the structure of the piping of a refrigerator as 2nd Embodiment of this invention. It is a block diagram which shows the structure of the refrigerating cycle of a refrigerator. It is a block diagram which shows the control relevant structure which concerns on 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 2: Refrigerator, 101: Heat insulation box, 101a: Front part of opening, 102: Refrigeration room, 103: 1st freezer room, 104: 2nd freezer room, 105: Vegetable room, 110: Heat insulation partition part, 110a: Front surface of heat insulating partition, 120: heat insulating door, 130, 230: control device, 240a: detour route, 240b: partition dew condensation prevention route, 141, 241: compressor, 142, 242: auxiliary radiator, 143, 243: partition Condensation prevention piping, 144, 244: Condenser, 145, 245: Opening condensation prevention piping, 146, 246: Pressure reducer, 147, 247: Evaporator, 151: Electromagnetic four-way valve, 251: Electromagnetic valve, 252: Refrigerant Backflow prevention valve, 161, 261: outside air temperature / humidity sensor, 162, 262: compressor operation state detection unit, 163, 253: damper device operation state detection unit.

Claims (6)

A heat insulating box having an opening;
A heat insulating partition for dividing the inside of the heat insulating box into a plurality of storage rooms;
A heat insulating door for opening and closing the opening of the heat insulating box;
Refrigerant piping for circulating refrigerant;
A compressor for compressing the refrigerant flowing through the refrigerant pipe;
A condensing unit for condensing the refrigerant compressed by the compressor;
A first flow path for circulating the refrigerant compressed by the compressor from the compressor to the condensing unit,
The heat insulating partition has a front surface of the heat insulating partition facing the heat insulating door when the heat insulating door closes the opening.
Furthermore, a second flow path for circulating a refrigerant around the front surface of the heat insulating partition is provided,
A refrigerator comprising a refrigerant channel switching unit for switching whether to circulate a refrigerant through the first channel or to circulate the refrigerant from the compressor through the second channel to the condensing unit.   The refrigerant flow switching unit causes the refrigerant to flow through the first flow channel, or causes the refrigerant to flow through the first flow channel and passes from the compressor through the second flow channel to the condensing unit. The refrigerator according to claim 1, wherein the refrigerator is a refrigerant flow path switching unit for switching whether the refrigerant is circulated.   An auxiliary heat dissipating unit is disposed between the compressor and the condensing unit to dissipate the refrigerant, and the auxiliary heat dissipating unit is disposed between the compressor and the refrigerant flow switching unit. The refrigerator according to claim 1 or claim 2. The heat insulating box has an opening front surface facing the heat insulating door when the heat insulating door closes the opening,
The said condensation part contains the 3rd flow path for distribute | circulating a refrigerant | coolant to the wall surface of the said heat insulation box arrange | positioned in the periphery of the said opening front part, The any one of Claim 1 to 3 Refrigerator.   5. The refrigerant backflow prevention valve according to claim 1, wherein at least one of the first flow path and the second flow path has a refrigerant backflow prevention valve for preventing a backflow of the refrigerant. refrigerator. The operating status of the refrigerator, the temperature inside the heat insulation box, the temperature around the front of the opening, the temperature around the front of the heat insulating partition, the temperature around the refrigerator, and the humidity around the refrigerator A detection unit for detecting at least one of them,
A control unit configured to control the refrigerant flow switching unit based on a dew condensation state around a contact portion between the heat insulation box and the heat insulation door based on a detection result of the detection unit; The refrigerator according to any one of claims 1 to 5, further comprising:

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