JP5761898B2 - Two-chamber refrigeration equipment - Google Patents

Description

  The present invention relates to a two-chamber refrigeration apparatus provided with two independent refrigerant circuit systems capable of controlling the temperature of two chambers simultaneously or individually.

  2. Description of the Related Art Conventionally, a two-chamber refrigeration apparatus that is installed in a refrigerator that is partitioned into two chambers by a partition wall so that the temperature of each chamber can be adjusted simultaneously or individually in a transport refrigeration apparatus mounted on a freezer car or the like. (See, for example, FIG. 2 of Patent Document 1). This two-chamber refrigeration apparatus includes two independent refrigerant circuit systems having a refrigeration capacity commensurate with the heat load of each chamber. In such a transport refrigeration apparatus, in a direct connection type refrigeration apparatus in which the compressor is directly connected to the vehicle travel engine via an electromagnetic clutch or the like, the rotation of the compressor depends on the rotational speed of the travel engine. To do. For this reason, it was not possible to control the refrigerating capacity by arbitrarily changing the rotation speed of the compressor.

  In addition, the cool box partitioned into two chambers by the partition wall may be used with the partition wall being moved according to the amount of cargo and the internal volume of each chamber being changed. In this case, since the heat load of each chamber changes, there is a case where one refrigerant circuit system has a space in the refrigerating capacity and the other refrigerant circuit system lacks the refrigerating capacity. As a result, on the room side where the refrigerating capacity is insufficient, there arises a problem that the internal temperature cannot be cooled to the set temperature. In order to avoid this problem, it is conceivable to select a refrigeration apparatus having a large refrigeration capacity. However, the refrigeration apparatus is not only expensive, but also against energy saving.

  On the other hand, Patent Document 2 is provided with two independent refrigerant circuit systems, and surplus cold heat from one refrigerant circuit system having high refrigeration efficiency is transferred between the refrigerant circuit systems via a heat storage heat exchanger. A combined refrigerant circuit facility is disclosed in which heat is stored in a heat storage material of a heat storage tank and cold heat is transferred to the other refrigerant circuit system having low refrigeration efficiency through the heat storage tank.

Japanese Patent Laid-Open No. 4-331860 (see FIG. 2) Japanese Patent No. 3046169 (see, for example, FIG. 1)

However, as shown in Patent Document 2, in the case of using a heat storage tank, equipment such as a heat storage tank filled with a heat storage material is essential in addition to the heat exchanger for heat storage. For this reason, the configuration of the equipment itself is complicated and expensive, and there are problems such as an increase in weight and installation space, which is extremely unsuitable for application to a transport refrigeration apparatus mounted on a refrigeration vehicle or the like. .
In such a situation, in the two-chamber refrigeration apparatus applied to a cold storage room in which the interior is partitioned into two chambers by a partition wall and the partition wall is movable according to the amount of cargo, one refrigerant circuit There is a need to provide a low-cost, lightweight and compact two-chamber refrigeration apparatus that can deliver refrigeration capacity from one system to the other refrigerant circuit system and that is simple in construction and easy to mount.

  The present invention has been made in view of such circumstances, and has a simple configuration capable of directly transferring refrigeration capacity between two refrigerant circuit systems that are low-cost, lightweight, compact, and easy to mount. It aims at providing the freezing apparatus for two rooms.

In order to solve the above problems, the two-chamber refrigeration apparatus of the present invention employs the following means.
That is, the two-chamber refrigeration apparatus according to the present invention includes the two independent refrigerant circuit systems, and the two-chamber refrigeration apparatus capable of controlling the temperature of the two chambers simultaneously or individually by the refrigerant circuit system. Between the refrigerant circuit systems of the system, there is provided a capacity transfer means for directly transferring the refrigeration capacity from one refrigerant circuit system to the other refrigerant circuit system, or a capacity transfer means for directly transferring the refrigeration capacity to each other. The refrigerant circuit system condenser-side equipment and evaporator-side equipment, the capacity transfer means, and the other refrigerant circuit system condenser-side equipment excluding the compressors of the refrigerant circuit system are combined into one host unit. is mountable one chamber side in the two chambers Te, the other refrigerant circuit system evaporator side devices are mountable on the other chamber side as an evaporator unit, the host unit, before An air circulation path, which is installed on the wall surface on one room side and in which the air in the one room is circulated through the fan and the evaporator of the evaporator side device, is formed by the two refrigerant circuit systems. A heat insulating section is provided for each of the condenser side devices and the capacity transfer means .

According to the present invention, between the two refrigerant circuit systems, the capacity transfer means for directly transferring the refrigeration capacity from at least one refrigerant circuit system to the other refrigerant circuit system, or the capacity transfer for directly transferring the refrigeration capacity to each other. When the temperature control operation of each chamber is performed, when the refrigerating capacity of one refrigerant circuit system of the two refrigerant circuit systems is insufficient, the refrigerating capacity is insufficient from the other refrigerant circuit system. One refrigerant circuit system can be directly supplied with the refrigerating capacity via the capacity transfer means, and the refrigerating capacity of the refrigerant circuit system having the insufficient capacity can be increased and operated. Therefore, it is not necessary to increase the refrigeration capacity of each refrigerant circuit system more than necessary, and the two-chamber refrigeration apparatus can be reduced in size and cost. In addition, the ability transfer means provided between the two refrigerant circuit systems can directly transfer the refrigeration capacity without any extra facilities, so the structure is simple, lightweight and compact, and therefore easy to mount. Can be provided. Further, the condenser side device and the evaporator side device of one refrigerant circuit system excluding the compressors of the two refrigerant circuit systems, the capacity transfer means, and the condenser side device of the other refrigerant circuit system are combined into one host unit. It can be installed in one of the two chambers, and the evaporator side device of the other refrigerant circuit system can be installed as an evaporator unit on the other chamber side. Since the host unit is provided together with the condenser-side equipment and the evaporator-side equipment of the circuit system and the condenser-side equipment of the other refrigerant circuit system, the two chambers are provided with two refrigerant circuit systems and capacity transfer means as a whole. The refrigeration apparatus can be compactly combined into two units, a host unit and an evaporator unit. Therefore, it is possible to facilitate the mounting of the two-chamber refrigeration apparatus including the capability transfer means on the refrigeration vehicle or the like. Further, an air circulation path in which the host unit is installed on the wall surface on the one chamber side and the air in the one room is circulated through the fan and the evaporator of the evaporator side device inside the unit is a two-system refrigerant circuit. Since the heat insulation is divided for each condenser side equipment and capacity transfer means of the system, the air in one room is not affected by the heat of the other two condenser side equipment and capacity transfer means. One chamber can be efficiently cooled while circulating and cooling to the side equipment and transferring the capacity.

  Further, the two-chamber refrigeration apparatus of the present invention is the above-described two-chamber refrigeration apparatus, wherein the capacity transfer means is connected to an evaporator of one refrigerant circuit system of the two refrigerant circuit systems via a switching valve. A heat exchanger is provided that is connected in parallel and heat-exchanges with the high-pressure liquid refrigerant of the other refrigerant circuit system to supercool the liquid refrigerant.

  According to the present invention, the capacity transfer means is connected in parallel to the evaporator of one refrigerant circuit system of the two refrigerant circuit systems via the switching valve, and exchanges heat with the high-pressure liquid refrigerant of the other refrigerant circuit system. Thus, since the heat exchanger for supercooling the liquid refrigerant is provided, the heat exchanger is connected to the refrigerant circuit system as a base via a switching valve, and only one refrigerant circuit system is connected. Capability transfer means that can directly transfer the refrigeration capability to the other refrigerant circuit system can be configured. Therefore, the capability transfer means can be simply configured with a minimum number of devices without interposing extra equipment.

  Furthermore, the two-chamber refrigeration apparatus of the present invention is the above-described two-chamber refrigeration apparatus, wherein the capacity transfer means has a switching valve on the inlet side of the evaporator of one refrigerant circuit system of the two refrigerant circuit systems. And a parallel circuit of a bypass circuit and a heat exchanger that superheats the liquid refrigerant by exchanging heat with the high-pressure liquid refrigerant of the other refrigerant circuit system. It is characterized by.

  According to the present invention, the capacity transfer means includes a bypass circuit and the other refrigerant circuit system connected in parallel to each other via the switching valve on the inlet side of the evaporator of one refrigerant circuit system of the two refrigerant circuit systems. Therefore, a heat exchanger and a heat exchanger for supercooling the liquid refrigerant are provided with a parallel circuit, so that the bypass circuit and the heat are connected to the base refrigerant circuit system via a switching valve. By simply connecting a parallel circuit with the exchanger, it is possible to configure a capacity transfer means that can directly transfer the refrigeration capacity from one refrigerant circuit system to the other refrigerant circuit system. Therefore, the capability transfer means can be simply configured with a minimum number of devices without interposing extra equipment.

  Furthermore, in the two-chamber refrigeration apparatus according to the present invention, in any one of the two-chamber refrigeration apparatuses described above, the capacity transfer means is insufficient in the refrigeration capacity of one of the two refrigerant circuit systems. In this case, the refrigeration capacity can be transferred from the other refrigerant circuit system while continuing the cooling operation in the refrigerant circuit system.

  According to the present invention, when the refrigerating capacity of one of the two refrigerant circuit systems is insufficient, the capacity is transferred from the other refrigerant circuit system while continuing the cooling operation in the refrigerant circuit system. Since the refrigeration capacity can be delivered through the means, the refrigeration capacity is delivered from one refrigerant circuit system to the other refrigerant circuit system, which has insufficient refrigeration capacity while simultaneously cooling the two refrigerant circuit systems. However, the refrigerant circuit system can be operated with an increased refrigeration capacity. Therefore, it is not necessary to increase the refrigeration capacity of each refrigerant circuit system more than necessary, and the two-chamber refrigeration apparatus provided with the capacity transfer means can be reduced in size and cost and cost.

  Furthermore, in the two-chamber refrigeration apparatus according to the present invention, in any one of the two-chamber refrigeration apparatuses described above, the capacity transfer means is insufficient in the refrigeration capacity of one of the two refrigerant circuit systems. In this case, only the capacity transfer means is allowed to function from the other refrigerant circuit system so that the cooling capacity can be delivered.

  According to the present invention, when the refrigerating capacity of one of the two refrigerant circuit systems is insufficient, the refrigerating capacity can be transferred from the other refrigerant circuit system by functioning only the capacity transfer means. Therefore, even when the other refrigerant circuit system reaches the set temperature and the cooling operation on the room side becomes unnecessary, the other refrigerant circuit system is operated so that the capacity transfer means functions. Thus, one refrigerant circuit system having insufficient refrigerating capacity can be supplied with the refrigerating capacity from the other refrigerant circuit system, and the refrigerating capacity of one refrigerant circuit system can be enhanced to operate. Therefore, it is not necessary to increase the refrigeration capacity of each refrigerant circuit system more than necessary, and the two-chamber refrigeration apparatus provided with the capacity transfer means can be reduced in size and cost and cost.

According to the present invention, when the refrigeration capacity of one refrigerant circuit system is insufficient during the temperature control operation of each chamber, the capacity is transferred from the other refrigerant circuit system to one refrigerant circuit system that is insufficient in refrigeration capacity. Since the refrigerant capacity can be directly transferred through the means and the refrigerant circuit system can be operated with the refrigerating capacity enhanced, it is not necessary to increase the refrigerating capacity of each refrigerant circuit system more than necessary. The refrigeration system can be reduced in size and cost, and the capacity transfer means provided between the two refrigerant circuit systems can directly transfer the refrigeration capacity without any extra equipment, so the configuration is simple. In addition, it is possible to provide a two-chamber refrigeration apparatus provided with a capability transfer means that is lightweight and compact and therefore easy to mount. Further, the condenser side device and the evaporator side device of one refrigerant circuit system excluding the compressors of the two refrigerant circuit systems, the capacity transfer means, and the condenser side device of the other refrigerant circuit system are combined into one host unit. It can be installed in one of the two chambers, and the evaporator side device of the other refrigerant circuit system can be installed as an evaporator unit on the other chamber side. Since the host unit is provided together with the condenser-side equipment and the evaporator-side equipment of the circuit system and the condenser-side equipment of the other refrigerant circuit system, the two chambers are provided with two refrigerant circuit systems and capacity transfer means as a whole. The refrigeration system for a refrigerator can be compactly combined into two units, a host unit and an evaporator unit, and therefore it is easy to mount a two-chamber refrigeration system equipped with capability transfer means to a refrigeration vehicle, etc. It can be. Further, an air circulation path in which the host unit is installed on the wall surface on the one chamber side and the air in the one room is circulated through the fan and the evaporator of the evaporator side device inside the unit is a two-system refrigerant circuit. Since the heat insulation is divided for each condenser side equipment and capacity transfer means of the system, the air in one room is not affected by the heat of the other two condenser side equipment and capacity transfer means. One chamber can be efficiently cooled while circulating and cooling to the side equipment and transferring the capacity.

It is a refrigerant circuit figure of the freezer for two rooms concerning a 1st embodiment of the present invention. It is a refrigerant circuit figure of the operation state (pattern 1) of the freezing apparatus for two rooms shown in FIG. It is a refrigerant circuit figure of the operation state (pattern 2) of the freezing apparatus for two rooms shown in FIG. FIG. 2 is a state diagram of the two-chamber refrigeration device shown in FIG. It is a refrigerant circuit figure of the freezer for two rooms concerning a 2nd embodiment of the present invention. It is a refrigerant circuit figure of the refrigerating device for two rooms concerning the reference example of this invention. FIG. 7 is a state diagram of the two-chamber refrigeration apparatus shown in FIG. 6 mounted on a refrigeration vehicle.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
FIG. 1 shows a refrigerant circuit diagram of a two-chamber refrigeration apparatus mounted on a refrigeration vehicle. The two-chamber refrigeration apparatus 1 includes a host unit 11 and a second chamber that are installed on the first chamber 4 side of a cool box 2 (see FIG. 4) that is partitioned into two chambers by a partition wall 3 that is movable in the front-rear direction. And an evaporator unit 12 installed on the 5 side. In the host unit 11 and the evaporator unit 12, the components of the two-chamber refrigeration apparatus 1 including the two independent first refrigerant circuit systems 20 and second refrigerant circuit systems 40 are distributed. Yes.

  The compressors 21 and 41 of the first refrigerant circuit system 20 and the second refrigerant circuit system 40 are each provided with an electromagnetic clutch, and are provided in the engine room of the refrigerated vehicle 6. The compressors 21 and 41 are driven from the traveling engine 7 of the refrigeration vehicle 6 via the crank pulley 8 and the drive belts 9 and 10, respectively. The rotations of the compressors 21 and 41 can be intermittently connected by an electromagnetic clutch.

  The first refrigerant circuit system 20 includes the compressor 21, the condenser 23 including the fan 22 that blows outside air, the receiver 24, the dryer 25, the sight glass 26, the main expansion valve 27, and the air in the first chamber 4. A circuit is configured by connecting an evaporator 29 having a fan 28 circulating through the refrigerant pipe 30 in this order. The first refrigerant circuit system 20 is not different from a known general refrigerant circuit system of a refrigeration apparatus.

  The second refrigerant circuit system 40 includes the compressor 41, a condenser 43 including a fan 42 for blowing outside air, a receiver 44, a dryer 45, a sight glass 46, a main expansion valve 47, and the second chamber 5. A circuit is configured by connecting an evaporator 49 having a fan 48 that circulates the air with a refrigerant pipe 50 in this order. The second refrigerant circuit 40 system is not different from the refrigerant circuit system of a known general refrigeration apparatus.

  All the other components except the compressor 2 in the first refrigerant circuit system 20 described above, and the fan 42, condenser 43, receiver 24, dryer 25, sight glass 26, etc. in the second refrigerant circuit system 40, etc. These condenser-side devices are collectively provided in the host unit 11. The host unit 11 is installed on the front wall on the first chamber 4 side of the cool box 2, and is configured such that the air in the first chamber 4 is circulated by the fan 28 via the evaporator 29. The path through which the air in the first chamber 4 is circulated is insulated from other parts in the host unit 11.

Further, the evaporator side devices such as the main expansion valve 47, the fan 48, and the evaporator 49 of the second refrigerant circuit system 40 are disposed in the evaporator unit 12. The evaporator unit 12 is installed at an upper part in the second chamber 5 of the cool box 2, and is configured such that the air in the second chamber 5 is circulated through the evaporator 49 by the fan 48.
Further, in the host unit 11, the capacity transfer means 31 that directly transfers the refrigeration capacity from the first refrigerant circuit system 20 side to the second refrigerant circuit system 40 side, and conversely, the first refrigerant from the second refrigerant circuit system 40 side. A capacity transfer means 51 that directly transfers the refrigeration capacity to the circuit system 20 is provided.

  The capacity transfer means 31 is branched from between the sight glass 26 of the first refrigerant circuit system 20 on the upstream side of the main expansion valve 27 and the main expansion valve 27, and in parallel with the main expansion valve 27 and the evaporator 29. The bypass circuit 32 connected, the two solenoid valves 33 and 34 constituting the switching valve, the sub-expansion valve 35 provided in the bypass circuit 32, and the bypass circuit provided on the downstream side of the sub-expansion valve 35 The heat exchanger 36 is configured to exchange heat between the refrigerant flowing on the 32 side and the high-pressure liquid refrigerant condensed by the condenser 43 flowing on the second refrigerant circuit system 40 side to supercool the liquid refrigerant.

  Similarly, the capacity transfer means 51 branches from between the sight glass 46 of the second refrigerant circuit system 40 on the upstream side of the main expansion valve 47 and the main expansion valve 47, and is connected to the main expansion valve 47 and the evaporator 49. The bypass circuit 52 connected in parallel, the two solenoid valves 53 and 54 constituting the switching valve, the sub-expansion valve 55 provided in the bypass circuit 52, and the downstream side of the sub-expansion valve 55 are provided. The heat exchanger 56 is configured to exchange heat between the refrigerant flowing on the bypass circuit 52 side and the high-pressure liquid refrigerant condensed by the condenser 23 flowing on the first refrigerant circuit system 20 side to supercool the liquid refrigerant. Yes.

  In the present embodiment, the capacity transfer means 31 and 51 for directly transferring the refrigeration capacity directly cools the liquid refrigerant flowing through the other refrigerant circuit system via the heat exchangers 36 and 56 as described above, and It directly transfers the refrigeration capacity by supercooling the refrigerant, etc., and is different from the one in which other facilities such as a heat storage tank or a heat storage material are exchanged in addition to the heat exchanger. Means.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
On the first refrigerant circuit system 20 side of the two-chamber refrigeration apparatus 1, the refrigerant compressed by the compressor 21 is circulated in the order of the condenser 23, the receiver 24, the dryer 25, the sight glass 26, the main expansion valve 27, and the evaporator 29. The interior of the first chamber 4 is cooled by cooling the air in the first chamber 4 of the cool box 2 circulated by the fan 28 by the evaporator 29. During this cooling operation, the solenoid valve 33 is closed and the solenoid valve 34 is opened.

  On the second refrigerant circuit system 40 side, the refrigerant compressed by the compressor 41 is circulated in the order of the condenser 43, the receiver 44, the dryer 45, the sight glass 46, the main expansion valve 47 and the evaporator 49. The interior of the second chamber 5 is cooled by cooling the air in the second chamber 5 of the refrigerated refrigerator 2 with the evaporator 49. During this cooling operation, the solenoid valve 53 is closed and the solenoid valve 54 is opened.

  The above cooling operation is performed by operating the first refrigerant circuit system 20 and the second refrigerant circuit system 40 simultaneously or individually, and cooling the first chamber 4 and the second chamber 5 simultaneously or individually, respectively. it can. Then, when the two chambers 4 and 5 are being cooled at the same time, for example, it is determined that there is a margin in the refrigerating capacity of the first refrigerant circuit system 20 and the refrigerating capacity of the second refrigerant circuit system 40 is insufficient. In this case, the refrigeration capacity is directly transferred from the first refrigerant circuit system 20 side to the second refrigerant circuit system 40 side where the refrigeration capacity is insufficient via the capacity transfer means 31, and the second refrigerant circuit system 40 Both chambers 4 and 5 can be cooled simultaneously while enhancing the refrigerating capacity.

  As shown in FIG. 2, the transfer of the refrigeration capacity by the capacity transfer means 31 is performed by opening the electromagnetic valve 33 and introducing a part of the high-pressure liquid refrigerant from the first refrigerant circuit system 20 to the bypass circuit 32, and this refrigerant is sub-expanded. The pressure is reduced by the valve 35, and then introduced into the heat exchanger 36. The heat exchanger 36 evaporates by exchanging heat with the high-pressure liquid refrigerant condensed in the condenser 43 flowing on the second refrigerant circuit system 40 side. This is done by supercooling the refrigerant. The refrigerant gasified by the heat exchanger 36 is merged with the refrigerant from the evaporator 29 and sucked into the compressor 21.

  Similarly, when it is determined that the refrigerating capacity of the second refrigerant circuit system 40 is sufficient and the refrigerating capacity of the first refrigerant circuit system 20 is insufficient, the refrigerating capacity is increased from the second refrigerant circuit system 40 side. The cooling operation can be performed at the same time while transferring the refrigerating capacity directly to the lacking first refrigerant circuit system 20 side via the capacity transfer means 51 and enhancing the refrigerating capacity of the first refrigerant circuit system 20. The delivery of the refrigerating capacity by the capacity transfer means 51 is the same as that of the capacity transfer means 31.

  The determination as to whether the refrigerating capacity is insufficient may be made automatically from the temperature drop rate in the cooled cool box 2, or the inside of the cool box 2 as the first chamber 4. The operator may make a determination in consideration of the position of the partition wall 3 partitioned by the second chamber 5 and the amount of cargo. In addition, the transfer of the refrigeration capacity may be canceled when the chamber side cooled by the refrigerant circuit system on the side receiving the transfer of the refrigeration capacity has reached the set temperature.

  On the other hand, when one of the two chambers, for example, the first chamber 4 side reaches the set temperature and the cooling operation of the first chamber 4 becomes unnecessary, normally, the compressor 21 of the first refrigerant circuit system 20 Although the clutch is turned off and the thermo is turned off, in this embodiment, as shown in FIG. 3, the operation of the compressor 21 is continued, the electromagnetic valve 34 is closed while the electromagnetic valve 33 is open, and the evaporator 29 Is set to a resting state, and the refrigerant is allowed to flow to the bypass circuit 32 side. As a result, the refrigerant is introduced into the heat exchanger 36 via the sub-expansion valve 35, and the capacity transfer means 31 functions so that the refrigeration capacity of the first refrigerant circuit system 20 is transferred to the second refrigerant circuit system 40 side. Can do.

  As a result, the refrigerating capacity of the second refrigerant circuit system 40 is enhanced, and the second chamber 5 can be quickly cooled to the set temperature. On the other hand, when the second chamber 5 reaches the set temperature first, the evaporator 49 on the second refrigerant circuit system 40 side is put into a paused state, and the capacity transfer means 51 is made to function so that the first refrigerant circuit system 20 By delivering the refrigeration capacity from the second refrigerant circuit system 40 side, the refrigeration capacity of the first refrigerant circuit system 20 can be enhanced and the first chamber 4 can be quickly cooled to the set temperature.

  Thus, during the cooling operation of the first chamber 4 and the second chamber 5, when it is determined that the refrigeration capacity of one of the first refrigerant circuit system 20 or the second refrigerant circuit system 40 is insufficient, The refrigerating capacity is directly transferred from the one refrigerant circuit system 20 (40) to the other refrigerant circuit system 40 (20), which has insufficient refrigerating capacity, via the capacity transfer means 31 (51), The refrigerant capacity of the refrigerant circuit system 40 (20) can be enhanced. For this reason, the other refrigerant circuit system 40 (20) side in which the refrigerating capacity is insufficient can be quickly cooled to the set temperature.

  Therefore, it is not necessary to increase the refrigerating capacity of the first and second refrigerant circuit systems 20 and 40 more than necessary, and the two-chamber refrigerating apparatus 1 can be reduced in size and cost. Moreover, since the capacity transfer means 31 and 51 provided between the two systems of the first and second refrigerant circuit systems 20 and 40 can directly transfer the refrigeration capacity without using extra facilities, the configuration is simple, lightweight and compact. Therefore, it is possible to provide the two-chamber refrigeration apparatus 1 including the capacity transfer means 31 and 51 that can be easily mounted.

  Further, the capability transfer means 31 and 51 are electromagnetic components that constitute a switching valve in the evaporator 29 (49) of one refrigerant circuit system 20 (40) of the two systems of the first refrigerant circuit system 20 and the second refrigerant circuit system 40. A heat exchanger 36 (56) connected in parallel via the valves 33 and 34 (53, 54) and exchanging heat with the high-pressure liquid refrigerant of the other refrigerant circuit system 40 (20) to supercool the liquid refrigerant. Since the heat exchangers 36 and 56 are simply connected to the refrigerant circuit systems 20 and 40 serving as the bases via the electromagnetic valves 33 and 34 or 53 and 54, the refrigerant circuit system 20 on one side is provided. The capacity transfer means 31 and 51 that can directly transfer the refrigeration capacity from (40) to the other refrigerant circuit system 40 (20) can be configured. Therefore, the capability transfer means 31 and 51 can be simply configured with only a minimum number of devices.

  Further, the condenser-side devices 22 to 26 and the evaporator-side devices 27 to 29 of the first refrigerant circuit system 20 excluding the compressors 21 and 41 of the two systems of the first and second refrigerant circuit systems 20 and 40, the capability transfer means 31 and 51, the condenser side devices 42 to 46 of the second refrigerant circuit system 40 and the like are collected in one host unit 11 and installed on the first chamber 4 side of the two chambers, and the second refrigerant circuit. The evaporator side devices 47 to 49 of the system 40 are configured as the evaporator unit 12 on the other second chamber 5 side. As described above, the capacity transfer means 31 and 51 are connected to the condenser side devices 22 to 26 and the evaporator side devices 27 to 29 of the first refrigerant circuit system 20 and the condenser side device 42 of the other second refrigerant circuit 40 system. By providing it in the host unit together with 46 or the like, the two-room refrigeration apparatus 1 including the capacity transfer means 31 and 51 as a whole can be compactly gathered. For this reason, the mounting | wearing with respect to the freezer 6 of the freezer 1 for two rooms provided with the capability transfer means 31 and 51 can be facilitated.

  In the above embodiment, the example in which the capacity transfer means 31 and 51 are provided in each of the first refrigerant circuit system 20 and the second refrigerant circuit system 40 has been described, but the capacity transfer means is provided only in one refrigerant circuit system. It may be provided. In this case, the refrigeration capacity of the two refrigerant circuit systems is usually increased, for example, 6: 4, and it is desirable that the capacity transfer means is provided on the refrigerant circuit system side having a large capacity.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The present embodiment is different from the above-described first embodiment in the configuration of the capacity transfer means 61 provided in the first refrigerant circuit system 20. Since other points are the same as those in the first embodiment, description thereof will be omitted.
In the present embodiment, as shown in FIG. 5, a switching valve (three-way electromagnetic valve) 62 is provided between the main expansion valve 27 and the evaporator 29 of the first refrigerant circuit system 20, and the switching valve 62 is interposed therebetween. By providing a parallel circuit on the inlet side of the evaporator 29 with the bypass circuit 63 and a heat exchanger 64 that exchanges heat with the high-pressure liquid refrigerant on the second refrigerant circuit system 40 side to supercool the liquid refrigerant, A capability transfer means 61 is configured.

  With the above configuration, during the normal cooling operation, the first chamber 4 can be cooled by flowing the refrigerant that has passed through the main expansion valve 27 to the bypass circuit 63 by the switching valve 62 and evaporating it by the evaporator 29. . On the other hand, when transferring the refrigerating capacity to the second refrigerant circuit system 40 side where the refrigerating capacity is insufficient, the switching valve 62 is switched to flow the refrigerant to the heat exchanger 64 side, and the capacity transfer means 61 is made to function. By supercooling the high-pressure liquid refrigerant on the two refrigerant circuit system 40 side, the refrigerating capacity can be transferred from the first refrigerant circuit system 20 to the second refrigerant circuit system 40.

  In the present embodiment, since a part of the refrigerant can be evaporated by the heat exchanger 64 and the rest can be evaporated by the evaporator 29, the capacity transfer is performed while the cooling operation of the first chamber 4 is performed by the evaporator 29. The refrigeration capacity can be transferred from the first refrigerant circuit system 20 side to the second refrigerant circuit system 40 side via the means 61. In addition, by stopping the fan 28 of the evaporator 29, it is possible to perform only the transfer of the refrigerating capacity while stopping the cooling of the first chamber 4.

  Therefore, also according to this embodiment, substantially the same effect as that of the first embodiment can be obtained. Further, the capacity transfer means 61 that can directly transfer the refrigerating capacity can be configured by simply connecting the parallel circuit of the bypass circuit 63 and the heat exchanger 64 to the base refrigerant circuit system 20 via the switching valve 62. it can. For this reason, the capability transfer means 61 can be configured simply with a minimum of equipment and without any extra equipment.

[Reference example]
Next, a reference example of the present invention will be described with reference to FIGS.
The present reference example is different from the first embodiment described above in that the capability transfer means 31 and 51 are kit-formed as the capability transfer unit 13. Since other points are the same as those in the first embodiment, description thereof will be omitted.
In the present reference example, the bypass circuit 32, the switching valves (electromagnetic valves 33 and 34), the auxiliary expansion valve 35 and the heat exchanger 36, and the pipes before and after the bypass valve 32, which are components of the capacity transfer means 31, and the capacity transfer means 51 are configured. The bypass circuit 52, the switching valve (electromagnetic valves 53 and 54), the auxiliary expansion valve 55, the heat exchanger 56, and the pipes before and after the unit are unitized as a capability transfer kit to configure the capability transfer unit 13.

  As described above, the capacity transfer means 31 and 51 are unitized as a kit so that the capacity transfer unit 13 is connected to the refrigerant pipes 30 and 50 between the two refrigerant circuit systems 20 and 40 of the existing two-chamber refrigeration apparatus. Can be easily modified to the two-chamber refrigeration apparatus 1 provided with the capacity transfer means 31 and 51. Therefore, it can be easily applied to an existing two-chamber refrigeration apparatus, and the performance of the two-chamber refrigeration apparatus can be improved.

  Further, as shown in FIG. 7, in this reference example, the components of the first refrigerant circuit system 20 provided on the first chamber 4 side of the cool box 2 are separated into the capacitor unit 14 and the evaporator unit 15, The component device of the second refrigerant circuit system 40 provided on the two-chamber 5 side can be suitably applied to the two-chamber refrigeration apparatus 1 of the type in which the condenser unit 16 and the evaporator unit 17 are separated. 13 can be installed on the vehicle chassis under the cool box 2 or the front wall of the cool box 2.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the second embodiment described above, the example in which the capability transfer means 61 is provided only on the first refrigerant circuit system 20 side has been described. However, the same capability transfer means may be provided on the second refrigerant circuit system 40 side. Of course. The heat exchangers 36, 56, and 64 that constitute the capacity transfer means 31, 51, and 61 may be any type of heat exchanger, but may be a plate heat exchanger, a double pipe heat exchanger, or the like. It goes without saying that it is desirable to make it as compact as possible.

DESCRIPTION OF SYMBOLS 1 Refrigeration apparatus for 2 rooms 2 Cold storage 4 1st chamber 5 2nd chamber 11 Host unit 12 Evaporator unit 13 Capability transfer unit 20 1st refrigerant circuit systems 21, 41 Compressor 23, 43 Condensers 29, 49 Evaporator 31, 51, 61 Capability transfer means 33, 34, 53, 54 Solenoid valve (switching valve)
36, 56, 64 Heat exchanger 40 Second refrigerant circuit system 62 Switching valve (3-way solenoid valve)
63 Bypass circuit

Claims (5)

In the two-chamber refrigeration apparatus comprising two independent refrigerant circuit systems, the temperature of the two chambers can be adjusted simultaneously or individually by the refrigerant circuit system,
Between the two refrigerant circuit systems, a capacity transfer means for directly passing the refrigeration capacity from one refrigerant circuit system to the other refrigerant circuit system or a capacity transfer means for directly transferring the refrigeration capacity to each other is provided.
One refrigerant circuit system condenser side equipment and evaporator side equipment excluding the compressors of the two refrigerant circuit systems, the capacity transfer means, and the other refrigerant circuit system condenser side equipment are one host unit. And the evaporator side device of the other refrigerant circuit system can be installed on the other chamber side as an evaporator unit, and can be installed on one chamber side of the two chambers .
The host unit is installed on the wall surface on the one room side, and an air circulation path through which air in the one room is circulated through the fan and the evaporator of the evaporator-side device in the unit. A two-chamber refrigeration apparatus characterized in that it is heat-insulated with respect to each condenser-side device and the capacity transfer means of the refrigerant circuit system of the system.   The capability transfer means is connected in parallel to the evaporator of one refrigerant circuit system of the two refrigerant circuit systems via a switching valve, and exchanges heat with the high-pressure liquid refrigerant of the other refrigerant circuit system. 2. The two-chamber refrigeration apparatus according to claim 1, further comprising a heat exchanger for supercooling the liquid refrigerant.   The capability transfer means includes a bypass circuit and a high-pressure liquid of the other refrigerant circuit system connected in parallel to each other via a switching valve on an inlet side of an evaporator of one refrigerant circuit system of the two refrigerant circuit systems. 2. The two-chamber refrigeration apparatus according to claim 1, further comprising a parallel circuit including a heat exchanger that performs heat exchange with the refrigerant and supercools the liquid refrigerant.   The capacity transfer means continues the cooling operation in the refrigerant circuit system from the other refrigerant circuit system when the refrigeration capacity of one of the two refrigerant circuit systems is insufficient. The two-chamber refrigerating apparatus according to any one of claims 1 to 3, wherein the refrigerating capacity is configured to be transferred.   When the refrigerating capacity of one of the two refrigerant circuit systems is insufficient, the capacity transferring means functions only the capacity transferring means from the other refrigerant circuit system to increase the refrigerating capacity. The two-chamber refrigeration apparatus according to any one of claims 1 to 3, wherein the two-chamber refrigeration apparatus is configured to be capable of delivery.

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