JP4548224B2 - Heat exchange system - Google Patents

Description

  The present invention relates to a heat exchange system and can be applied to, for example, an air conditioning system.

  2. Description of the Related Art Conventionally, there is a technique for cooling a secondary cooling target using a refrigerant flowing through a heat exchange system such as an air conditioning system.

  For example, in the heat exchange system introduced in Patent Document 1, a refrigerant before being expanded by an expansion valve is expanded by a capillary tube, and a secondary cooling target is cooled by using the expanded refrigerant.

  In addition, techniques related to the present invention are disclosed in Patent Documents 2 and 3.

JP-A-62-69066 Japanese Patent Laid-Open No. 11-23081 JP-A-6-159738

  For example, in the heat exchange system introduced in Patent Document 1, there is a possibility that condensation occurs on a secondary cooling target depending on the operating conditions and air conditions. This is because the pressure difference generated in the capillary tube cannot be adjusted according to these conditions. Therefore, even if it is possible to prevent condensation on a secondary cooling target for a predetermined condition, it is not possible to prevent condensation according to a change in the condition. In addition, cooling, heating, dehumidification, or inverter frequency can be adopted as the operating condition, and indoor and outdoor temperatures and humidity can be adopted as the air condition.

  In the heat exchange system introduced in Patent Document 2, two electronic expansion valves are provided in series between the condenser and the evaporator. In the electronic expansion valve, the pressure difference generated at both ends thereof can be adjusted, so that the temperature of the refrigerant flowing between the two electronic expansion valves can be adjusted. Therefore, by making the temperature of the refrigerant higher than the dew point, it is possible to cool the secondary cooling target without causing condensation.

  However, since the electronic expansion valve is expensive and the control of the electronic expansion valve is complicated, it is not desirable to configure such a heat exchange system.

  This invention is made | formed in view of the situation mentioned above, and it aims at preventing the dew condensation accompanying the cooling of a secondary cooling object without incurring cost.

  The heat exchange system according to claim 1 of the present invention includes an outdoor heat exchanger (12) that is a heat exchanger provided outdoors, and an indoor heat exchanger (13) that is a heat exchanger provided indoors. ), A compressor (11) that is provided between the outdoor heat exchanger and the indoor heat exchanger and compresses the refrigerant, and the indoor heat exchanger on the opposite side of the compressor and the An expansion valve (15) provided between the outdoor heat exchanger, a first end (211) connected between the outdoor heat exchanger and the expansion valve, and a second end (212). A first capillary tube (21), one end (221) connected between the indoor heat exchanger and the expansion valve, and a second capillary tube (22) having the other end (222). The discharge side (111) of the compressor includes the outdoor heat exchanger and the indoor heat exchange. One of the first and second capillary tubes, one end of which is connected between the condenser (12; 13) and the expansion valve ( 21; 22) is bypassed, and the refrigerant flows from between the condenser and the expansion valve to the one other end (212, 222).

  A heat exchange system according to claim 2 of the present invention is the heat exchange system according to claim 1, wherein the discharge side (111) of the compressor (11) is connected to the outdoor heat exchanger (12) and the heat exchanger system (12). A switching valve (14) for selecting which of the indoor heat exchanger (13) is connected, and the first capillary tube (21) between the outdoor heat exchanger and the expansion valve (15). And a first check valve (31) for bypassing the first capillary tube and flowing the refrigerant only in a direction toward the other end (212).

  A heat exchange system according to a third aspect of the present invention is the heat exchange system according to the second aspect, wherein the third capillary tube (23) constituting a series connection with the first check valve (31) is provided. In addition, the series connection bypasses the first capillary tube (21).

  A heat exchange system according to a fourth aspect of the present invention is the heat exchange system according to the third aspect, wherein the third capillary tube (23) has a larger conductance than the first capillary tube (21). .

  A heat exchange system according to a fifth aspect of the present invention is the heat exchange system according to any one of the second to fourth aspects, wherein the indoor heat exchanger (13) and the expansion valve (15). ) To the other end (222) of the second capillary tube (22) only by a second check valve (32) that bypasses the second capillary tube and flows the refrigerant. Prepare.

  A heat exchange system according to a sixth aspect of the present invention is the heat exchange system according to the fifth aspect, wherein the fourth capillary tube (24) constituting a series connection with the second check valve (32) is provided. In addition, the series connection bypasses the second capillary tube (22).

  A heat exchange system according to a seventh aspect of the present invention is the heat exchange system according to the sixth aspect, wherein the fourth capillary tube (24) has a larger conductance than the second capillary tube (22). .

  The heat exchange system according to claim 8 of the present invention includes an outdoor heat exchanger (12) that is a heat exchanger provided outdoors, and an indoor heat exchanger (13) that is a heat exchanger provided indoors. ), A compressor (11) that is provided between the outdoor heat exchanger and the indoor heat exchanger and compresses the refrigerant, and the indoor heat exchanger on the opposite side of the compressor and the An expansion valve (15) provided between the outdoor heat exchanger, a third heat exchanger (4), and the outdoor heat exchanger are connected to the expansion valve via the third heat exchanger. A first pipe (52) to be connected and a second pipe (53) for connecting the indoor heat exchanger to the expansion valve via the third heat exchanger.

  A heat exchange system according to a ninth aspect of the present invention is the heat exchange system according to the eighth aspect, wherein the discharge side (111) of the compressor (1) is connected to the outdoor heat exchanger (12) and the indoor space. It further has a switching valve (14) for selecting which of the heat exchangers (13) for connection.

  A heat exchange system according to a tenth aspect of the present invention is the heat exchange system according to the ninth aspect, wherein the heat exchange system is provided in the second pipe (53), and is arranged from the indoor heat exchanger (13) side. A first check valve (33) that allows the refrigerant to flow only in a direction toward the expansion valve (15) through the third heat exchanger (4), and the first check valve. And a first capillary tube (25) connected in parallel to the two pipes.

  A heat exchange system according to an eleventh aspect of the present invention is the heat exchange system according to the tenth aspect, wherein the heat exchange system is provided in the first pipe (52), and is arranged from the outdoor heat exchanger (12) side. A second check valve (34) for flowing the refrigerant only in a direction toward the expansion valve (15) through the third heat exchanger (4), and the second check valve. And a second capillary tube (26) connected in parallel to the one pipe.

  A heat exchange system according to a twelfth aspect of the present invention includes an outdoor heat exchanger (12) that is a heat exchanger provided outdoors, and an indoor heat exchanger (13) that is a heat exchanger provided indoors. ), A compressor (11) that is provided between the outdoor heat exchanger and the indoor heat exchanger and compresses the refrigerant, and the indoor heat exchanger on the opposite side of the compressor and the An expansion valve (15) provided between the outdoor heat exchanger, a third heat exchanger (4), and the outdoor heat exchanger are connected to the expansion valve via the third heat exchanger. The first pipe (52) to be connected and the discharge side (111) of the compressor via the third heat exchanger are used as a condenser of the outdoor heat exchanger and the indoor heat exchanger. And a second pipe (54; 55; 56) connected to any one of the functions.

  A heat exchange system according to claim 13 of the present invention is the heat exchange system according to claim 12, wherein the discharge side (111) of the compressor (1) is connected to the outdoor heat exchanger (12) and the heat exchanger system (12). A switching valve (14) for selecting which of the indoor heat exchanger (13) is connected is further provided, and the second pipe (56) connects the discharge side to the switching valve.

  According to the heat exchange system of the first aspect of the present invention, when cooling is performed, the outdoor heat exchanger functions as a condenser, and the refrigerant is expanded by the first capillary tube and given to the other end. The secondary cooling object provided between the other end of the first capillary tube and the other end of the second capillary tube is cooled. Moreover, the refrigerant before being expanded by the expansion valve is given to the other end, bypassing the first capillary tube. Therefore, the temperature of the refrigerant given to the other end of the first capillary tube is higher than that when only the first capillary tube is expanded, and condensation can be prevented.

  When heating is performed, the indoor heat exchanger functions as a condenser, and the refrigerant is expanded by the second capillary tube and given to the other end, and the other end of the second capillary tube and the first The secondary cooling object provided between the other end of the capillary tube is cooled. Moreover, the refrigerant before being expanded by the expansion valve is given to the other end, bypassing the second capillary tube. Therefore, the temperature of the refrigerant given to the other end of the second capillary tube is higher than that when only the second capillary tube is expanded, and condensation can be prevented.

  According to the heat exchange system of claim 2 of the present invention, during cooling, the refrigerant before being expanded by the expansion valve is expanded by the first capillary tube and given to the other end, and the first capillary A secondary cooling object provided between the other end of the tube and the other end of the second capillary tube is cooled. Moreover, during cooling, the refrigerant before being expanded by the expansion valve flows not only to the first capillary tube but also to the first check valve, and is given to the other end of the first capillary tube. Therefore, the temperature of the refrigerant given to the other end of the first capillary tube is higher than that when only the first capillary tube is expanded, and condensation can be prevented.

  During heating, the refrigerant before being expanded by the expansion valve is expanded by the second capillary tube and given to the other end to cool the secondary cooling target. However, since the normal outside air temperature during heating is low and the humidity is low, the dew point is low, and even if the refrigerant expanded only by the second capillary tube is given to the secondary cooling object provided outside the room, the dew condensation will not occur. Hard to do.

  During heating, since the refrigerant does not flow through the check valve, the refrigerant is also expanded by the first capillary tube, and the pressure difference between both ends of the expansion valve is not impaired.

  According to the heat exchange system of the third aspect of the present invention, during cooling, the temperature of the refrigerant provided to the other end of the first capillary tube is lowered as compared with the case where the third capillary tube is not provided. Can approach the dew point. Therefore, a secondary cooling target can be efficiently cooled.

  According to the heat exchange system of the fourth aspect of the present invention, the refrigerant can flow more easily to the first check valve than to the first capillary tube, and thus is given to the other end of the first capillary tube. It can be avoided that the temperature of the refrigerant becomes lower than the dew point.

  According to the heat exchange system of the fifth aspect of the present invention, condensation during heating is more effectively prevented.

  According to the heat exchange system according to claim 6 of the present invention, during heating, the temperature of the refrigerant given to the other end of the second capillary tube is lowered as compared with the case where the fourth capillary tube is not provided, Can approach the dew point. Therefore, a secondary cooling target can be efficiently cooled.

  According to the heat exchanging system of the seventh aspect of the present invention, the refrigerant is more likely to flow to the second check valve than to the second capillary tube, and thus is given to the other end of the second capillary tube. It can be avoided that the temperature of the refrigerant becomes lower than the dew point.

  According to the heat exchanging system of the eighth aspect of the present invention, the refrigerant before being expanded by the expansion valve and the refrigerant after being expanded are both in the third case regardless of whether cooling or heating is performed. Given to the heat exchanger. Therefore, it is possible to cool the secondary cooling object provided in the third heat exchanger at a temperature lower than the temperature of the refrigerant before expansion and higher than the dew point, and thus the secondary cooling. No condensation occurs on the subject.

  According to the heat exchange system according to claim 9 or claim 13 of the present invention, switching between heating and cooling is possible.

  According to the heat exchanging system of the tenth aspect of the present invention, during cooling, only the refrigerant before being expanded by the expansion valve is given to the third heat exchanger, so that the third temperature is higher than the dew point. The secondary cooling object provided in the heat exchanger can be cooled. Therefore, no condensation occurs on the cooling target. In addition, during heating, since both the refrigerant before being expanded by the expansion valve and the refrigerant after being expanded are supplied to the third heat exchanger, the temperature is lower than the temperature of the condensed refrigerant. The secondary cooling object can be cooled. During heating, the normal outside air temperature is low and the dew point is lowered, so the temperature is higher than the dew point. Therefore, the secondary cooling object provided outside the room can be efficiently cooled without causing condensation.

  According to the heat exchanging system of the eleventh aspect of the present invention, only the refrigerant before being expanded by the expansion valve is given to the third heat exchanger regardless of whether cooling or heating is performed. Therefore, the secondary cooling object provided in the third heat exchanger can be cooled at a temperature higher than the dew point, thereby preventing dew condensation.

  According to the heat exchange system of the twelfth aspect of the present invention, when cooling is performed, the refrigerant discharged from the compressor and the refrigerant before being expanded by the expansion valve are given to the third heat exchanger. The secondary cooling object provided in the third heat exchanger can be cooled at a temperature lower than the temperature of the discharge gas and higher than the dew point. Therefore, no condensation occurs on the secondary cooling target.

  In addition, when heating is performed, the discharge gas from the compressor and the refrigerant after being expanded by the expansion valve are given to the third heat exchanger, so that the temperature is lower than that when cooling and higher than the dew point. Thus, a secondary cooling target can be cooled. During heating, the normal outside air temperature is low and the dew point is lowered, so the temperature is higher than the dew point. Therefore, the secondary cooling object provided outside the room can be efficiently cooled without causing condensation.

First embodiment.
FIG. 1 shows a heat exchange system that performs cooling according to the present embodiment. The heat exchange system includes an outdoor heat exchanger 12, an indoor heat exchanger 13, a compressor 11, an expansion valve 15, capillary tubes 21 and 22, and a pipe 51. In FIG. 1, the flow path and flow direction of the refrigerant when performing cooling are indicated by solid arrows, and the same applies to the drawings used in the description of the second and subsequent embodiments.

  The outdoor heat exchanger 12 is a heat exchanger provided outside the room, and functions as a condenser here. The indoor heat exchanger 13 is a heat exchanger provided indoors, and functions as an evaporator here.

  The compressor 11 is provided between the outdoor heat exchanger 12 and the indoor heat exchanger 13 and compresses the refrigerant. Specifically, the discharge side 111 of the compressor 11 is connected to the outdoor heat exchanger 12.

  The expansion valve 15 is provided on the opposite side of the compressor 11 between the outdoor heat exchanger 12 and the indoor heat exchanger 13. Here, the refrigerant condensed in the outdoor heat exchanger 12 is expanded. The heat is supplied to the indoor heat exchanger 13.

  The capillary tube 21 has one end 211 connected between the outdoor heat exchanger 12 and the expansion valve 15, and the other end 212. The capillary tube 22 has one end 221 connected between the indoor heat exchanger 13 and the expansion valve 15, and the other end 222. The other end 212 and the other end 222 are connected via the cooling jacket 41, for example.

  The refrigerant condensed in the outdoor heat exchanger 12 is expanded in the capillary tube 21 and given to the other end 212. The refrigerant passes through the cooling jacket 41 and is further expanded in the capillary tube 22 and given to one end 221 thereof.

  The tube 51 has one end 511 and the other end 512, one end 511 is connected between the expansion valve 15 and the outdoor heat exchanger 12, and the other end 512 is connected to the other end 212 of the capillary tube 21. .

  The refrigerant flows through the pipe 51 from one end 511 to the other end 512. This content can be grasped when the refrigerant flows by bypassing the capillary tube 21 from between the outdoor heat exchanger 12 and the expansion valve 15 to the other end 212.

  According to the heat exchange system described above, the cooling jacket 41 is cooled by the refrigerant flowing between the other end 212 of the capillary tube 21 and the other end 222 of the capillary tube 22, and the secondary cooling provided in the cooling jacket 41 is performed. The object 42 is cooled. As the secondary cooling target 42, for example, an inverter circuit provided outside the room can be adopted. Since the refrigerant before being expanded by the expansion valve 15 bypasses the capillary tube 21 and is given to the other end 212, the temperature of the refrigerant given to the other end 212 of the capillary tube 21 is expanded only by the capillary tube 21. It is higher than the case where it does, and dew condensation in the secondary cooling object 42 can be prevented.

  FIG. 2 shows a heat exchange system that performs heating. The heat exchange system includes an outdoor heat exchanger 12, an indoor heat exchanger 13, a compressor 11, an expansion valve 15, capillary tubes 21 and 22, and a tube 57. In FIG. 2, the flow path and flow direction of the refrigerant when heating is performed are indicated by broken-line arrows, and the same applies to the drawings used in the description of the second and subsequent embodiments.

  Here, the outdoor heat exchanger 12 and the indoor heat exchanger 13 function as an evaporator and a condenser, respectively.

  The discharge side 111 of the compressor 11 is connected to the indoor heat exchanger 13.

  Here, the expansion valve 15 expands the refrigerant condensed in the indoor heat exchanger 13 and supplies it to the outdoor heat exchanger 12.

  The refrigerant condensed in the indoor heat exchanger 13 is expanded in the capillary tube 22 and given to the other end 222. The refrigerant is further expanded by the capillary tube 21 via the cooling jacket 41 and given to the one end 211.

  The tube 57 has one end 571 and the other end 572, one end 571 is connected between the expansion valve 15 and the indoor heat exchanger 13, and the other end 572 is connected to the other end 222 of the capillary tube 22. .

  The refrigerant flows through the tube 57 from one end 571 to the other end 572. This content can be grasped when the refrigerant flows by bypassing the capillary tube 22 from the space between the indoor heat exchanger 13 and the expanded stool 15 to the other end 222.

  According to such a heat exchange system, the cooling jacket 41 is cooled by the refrigerant flowing between the other end 212 of the capillary tube 21 and the other end 222 of the capillary tube 22, and the subsidiary jacket provided in the cooling jacket 41. The cooling target 42 is cooled. Since the refrigerant before being expanded by the expansion valve 15 is given to the other end 222 by bypassing the capillary tube 22, the temperature of the refrigerant given to the other end 222 of the capillary tube 22 is expanded only by the capillary tube 22. It is higher than the case where it does, and dew condensation in the secondary cooling object 42 can be prevented.

  In the present invention, the cooling jacket 41 is not essential, and the secondary cooling target 42 may be directly cooled as long as a path through which the refrigerant flows between the capillary tubes 21 and 22 is provided.

  In any of the heat exchange systems described above, the connection relationship between the compressor 11, the outdoor heat exchanger 12, and the indoor heat effector 13 can be grasped as follows. That is, the discharge side 111 of the compressor 11 is connected to one of the outdoor heat exchanger 12 and the indoor heat exchanger 13 that functions as a condenser.

Second embodiment.
FIG. 3 conceptually shows the heat exchange system according to the present embodiment. The heat exchange system further includes a switching valve 14 and a check valve 31 with respect to the heat exchange system shown in FIG.

  The switching valve 14 selects whether the discharge side 111 of the compressor 11 is connected to the outdoor heat exchanger 12 or the indoor heat exchanger 13. That is, switching between cooling and heating is possible.

  The check valve 31 is provided in the pipe 51 and allows the refrigerant to flow only in the direction from the one end 511 to the other end 512 of the same pipe 51. That is, the refrigerant flows by bypassing the capillary tube 21 only in the direction from the space between the outdoor heat exchanger 12 and the expansion valve 15 toward the other end 212.

  Therefore, at the time of cooling, the refrigerant flows through both the capillary tube 21 and the check valve 31 from the one end 511 of the tube 51 to the other end 212 side of the capillary tube 21. On the other hand, during heating, the refrigerant flows through the capillary tube 21 from the other end 212 to the one end 211 and does not flow to the check valve 31.

  According to the heat exchange system, during cooling, the refrigerant passes through the check valve 31 and is supplied to the other end 212 of the capillary tube 21. Therefore, as described in the first embodiment, dew condensation occurs. Is prevented.

  Further, during heating, the refrigerant before being expanded by the expansion valve 15 is expanded by the capillary tube 22 and is supplied to the other end 222 to cool the secondary cooling target 42. However, since the normal outside air temperature during heating is low and the humidity is low, the dew point is low, and even if the refrigerant expanded only by the capillary tube 22 is given to the secondary cooling object 42 provided outside the room, the dew condensation does not occur. Hard to do.

  During heating, since the refrigerant does not flow through the check valve 31, the refrigerant is also expanded by the capillary tube 21, and the pressure difference between both ends of the expansion valve 15 is not impaired.

  FIG. 4 shows an aspect in which the heat exchange system further includes a capillary tube 23. In FIG. 4, the compressor 11, the outdoor heat exchanger 12, the indoor heat exchanger 13, and the switching valve 14 are not illustrated, but are connected in the same manner as the above-described configuration (FIG. 3).

  The capillary tube 23 forms a series connection with the check valve 31, and the series connection bypasses the capillary tube 21. In FIG. 4, the capillary tube 23 is provided on the one end 211 side of the capillary tube 21 with respect to the check valve 31, but may be provided on the other end 212 side, for example. In any case, during cooling, the refrigerant condensed in the outdoor heat exchanger 12 can be expanded in the capillary tube 23 and given to the other end 212 of the capillary tube 21.

  According to such a heat exchange system, during cooling, the temperature of the refrigerant provided to the other end 212 of the capillary tube 21 can be lowered as compared with the case where the capillary tube 23 is not provided, and can be brought close to the dew point. Therefore, the secondary cooling object 42 can be efficiently cooled.

  Further, it is desirable that the conductance of the capillary tube 23 is larger than that of the capillary tube 21. With this configuration, it is possible to prevent the refrigerant from flowing more easily to the check valve 31 than to the capillary tube 21, thereby preventing the temperature of the refrigerant applied to the other end 212 of the capillary tube 21 from becoming lower than the dew point.

Third embodiment.
5 and 6 conceptually show the heat exchange system according to the present embodiment. The heat exchange system further includes a check valve 32 with respect to the heat exchange systems shown in FIGS. 3 and 4, respectively. 5 and 6, the compressor 11, the outdoor heat exchanger 12, and the switching valve 14 are not shown, but are connected in the same manner as the configuration described in the second embodiment (FIG. 3).

  The check valve 32 has one end 321 connected between the indoor heat exchanger 13 and the expansion valve 15, and the other end 322 connected to the other end 222 of the capillary tube 22. Then, the refrigerant is allowed to flow only from one end 321 to the other end 322. That is, the refrigerant flows by bypassing the capillary tube 22 only in the direction from the space between the indoor heat exchanger 13 and the expansion valve 15 toward the other end 222.

  According to the heat exchange system described above, in addition to the effects described in the second embodiment, the refrigerant before being expanded by the expansion valve 15 during heating is not only the capillary tube 22 but also the check valve. 32 also flows to the other end 222 of the capillary tube 22. Therefore, the temperature of the refrigerant applied to the other end 222 of the capillary tube 22 is higher than that when only the capillary tube 22 is expanded, so that condensation can be more efficiently prevented during heating.

  FIG. 7 shows a mode in which the capillary tube 24 is further provided in the heat exchange system shown in FIG.

  The capillary tube 24 forms a series connection with the check valve 32, and the series connection bypasses the capillary tube 22. In FIG. 7, the capillary tube 24 is provided on the one end 221 side of the capillary tube 22 with respect to the check valve 32, but may be provided on the other end 222 side, for example. In any case, during heating, the refrigerant condensed in the indoor heat exchanger 13 can be expanded by the capillary tube 24 and supplied to the other end 222 of the capillary tube 22.

  Therefore, according to such a heat exchange system, during heating, the temperature of the refrigerant provided to the other end 222 of the capillary tube 22 can be lowered as compared with the case where the capillary tube 24 is not provided, and can be close to the dew point. . Therefore, the secondary cooling object 42 can be efficiently cooled.

  Further, it is desirable that the conductance of the capillary tube 24 is larger than that of the capillary tube 22. With this configuration, it is possible to prevent the refrigerant from flowing more easily to the check valve 32 than to the capillary tube 22, thereby preventing the temperature of the refrigerant applied to the other end 222 of the capillary tube 22 from becoming lower than the dew point.

Fourth embodiment.
FIG. 8 conceptually shows a heat exchange system that performs refrigerant according to the present embodiment. The heat exchange system includes an outdoor heat exchanger 12, an indoor heat exchanger 13, a compressor 11, an expansion valve 15, a heat exchanger 4, and pipes 52 and 53.

  Here, the outdoor heat exchanger 12 and the indoor heat exchanger 13 function as a condenser and an evaporator, respectively.

  The compressor 11 is provided between the outdoor heat exchanger 12 and the indoor heat exchanger 13 and compresses the refrigerant. Specifically, the discharge side 111 of the compressor 11 is connected to the outdoor heat exchanger 12.

  The expansion valve 15 is provided between the outdoor heat exchanger 12 and the indoor heat exchanger 13 on the side opposite to the compressor 11, and expands the refrigerant condensed in the outdoor heat exchanger 12 here. The heat is supplied to the indoor heat exchanger 13.

  The pipe 52 connects the outdoor heat exchanger 12 to the expansion valve 15 via the heat exchanger 4.

  The pipe 53 connects the indoor heat exchanger 13 to the expansion valve 15 via the heat exchanger 4.

  According to the heat exchange system described above, both the refrigerant before being expanded by the expansion valve 15 and the refrigerant after being expanded are supplied to the heat exchanger 4. Therefore, the secondary cooling object 42 provided in the heat exchanger 4 can be cooled at a temperature lower than the temperature of the refrigerant before expansion and higher than the dew point, and thus the secondary cooling object. No condensation occurs at 42. For example, a cooling jacket can be used for the heat exchanger 4, and an inverter circuit can be used for the secondary cooling object 42, for example.

  FIG. 9 conceptually shows a heat exchange system that performs heating. The heat exchange system also includes an outdoor heat exchanger 12, an indoor heat exchanger 13, a compressor 11, an expansion valve 15, a heat exchanger 4, and pipes 52 and 53.

  Here, the outdoor heat exchanger 12 and the indoor heat exchanger 13 function as an evaporator and a condenser, respectively.

  The discharge side 111 of the compressor 11 is connected to the indoor heat exchanger 13.

  Here, the expansion valve 15 expands the refrigerant condensed in the indoor heat exchanger 13 and supplies it to the outdoor heat exchanger 12.

  Also in the heat exchange system that performs such heating, the same effect as that of the heat exchange system that performs cooling described above can be obtained.

  In any of the heat exchange systems described above, the connection relationship between the compressor 11, the outdoor heat exchanger 12, and the indoor heat effector 13 can be grasped as follows. That is, the discharge side 111 of the compressor 11 is connected to one of the outdoor heat exchanger 12 and the indoor heat exchanger 13 that functions as a condenser.

  FIG. 10 shows a mode in which a switching valve 14 is further provided for the heat exchange system (FIGS. 8 and 9) described above. The switching valve 14 selects whether the discharge side 111 of the compressor 11 is connected to the outdoor heat exchanger 12 or the indoor heat exchanger 13. That is, switching between cooling and heating is possible.

  According to such a heat exchange system, switching between cooling and heating is possible, and in any case, dew condensation on the secondary cooling object 42 can be prevented in the same manner as described above.

Fifth embodiment.
FIG. 11 conceptually shows the heat exchange system according to the present embodiment. The heat exchange system further includes a capillary tube 25 and a check valve 33 with respect to the heat exchange system shown in FIG. In FIG. 11, the outdoor heat exchanger 12, the compressor 11, and the switching valve 14 are not illustrated, but are connected to the expansion valve 15 in the same manner as the configuration described in the fourth embodiment (FIG. 10). .

  The check valve 33 is provided in the pipe 53 and allows the refrigerant to flow only in the direction from the indoor heat exchanger 13 side to the expansion valve 15 side via the heat exchanger 4. In FIG. 11, the check valve 33 is provided on the indoor heat exchanger 13 side with respect to the heat exchanger 4, but may be provided on the expansion valve 15 side, for example.

  The capillary tube 25 is connected in parallel to a pipe 53 including a check valve 33. Specifically, in FIG. 11, one end 251 of the capillary tube 25 is connected between the expansion valve 15 and the heat exchanger 4, and the other end 252 is connected between the check valve 33 and the indoor heat exchanger 13. ing.

  At the time of cooling, the capillary tube 25 expands the refrigerant flowing from one end 251 and gives it to the other end 252. At this time, the pressure at the other end 252 is lower than the pressure at the one end 251, and a pressure difference is generated between both ends 251 and 252 of the capillary tube 25. However, since the check valve 33 is provided, the refrigerant does not flow through the heat exchanger 4.

  On the other hand, during heating, the capillary tube 25 expands the refrigerant flowing from the other end 252 and gives it to the one end 251. At this time, the pressure at one end 251 is lower than the pressure at the other end 252, and a pressure difference is generated between both ends 251 and 252 of the capillary tube 25. Therefore, the refrigerant flows from the other end 252 of the same capillary tube 25 to the one end 251 via the heat exchanger 4, and the check valve 33 does not disturb the flow.

  According to such a heat exchange system, only the refrigerant before being expanded by the expansion valve 15 is given to the heat exchanger 4 at the time of cooling, so that the secondary cooling object 42 is set at a temperature higher than the dew point. Can be cooled. Therefore, no condensation occurs on the secondary cooling object 42. Further, at the time of heating, since both the refrigerant before being expanded by the expansion valve 15 and the refrigerant after being expanded are supplied to the heat exchanger 4, the secondary refrigerant is used at a temperature lower than that of the condensed refrigerant. The target cooling object 42 can be cooled. However, since the normal outside air temperature is low and the dew point is lowered during heating, the temperature is higher than the dew point. Therefore, the secondary cooling object 42 provided outside the room can be efficiently cooled without causing condensation.

Sixth embodiment.
FIG. 12 conceptually shows the heat exchange system according to the present embodiment. The heat exchange system further includes a capillary tube 26 and a check valve 34 with respect to the heat exchange system shown in FIG. In FIG. 12, the compressor 11 and the switching valve 14 are not shown, but are connected to the expansion valve 15 in the same manner as in the configuration described in the fourth embodiment (FIG. 10).

  The check valve 34 is provided in the pipe 52 and allows the refrigerant to flow only in the direction from the outdoor heat exchanger 12 side to the expansion valve 15 side via the heat exchanger 4. In FIG. 12, the check valve 34 is provided on the outdoor heat exchanger 12 side with respect to the heat exchanger 4, but may be provided, for example, on the expansion valve 15 side.

  The capillary tube 26 is connected in parallel to a pipe 52 including the check valve 34. Specifically, in FIG. 12, one end 261 of the capillary tube 26 is connected between the expansion valve 15 and the heat exchanger 4, and the other end 262 is connected between the check valve 34 and the outdoor heat exchanger 12. ing.

  At the time of cooling, the capillary tube 26 expands the refrigerant flowing from the other end 262 and gives it to the one end 261. At this time, the pressure at one end 261 is lower than the pressure at the other end 262, and a pressure difference is generated between both ends 261 and 262 of the capillary tube 26. Therefore, the refrigerant flows from the other end 262 of the same capillary tube 26 to the one end 261 via the heat exchanger 4, and the check valve 33 does not disturb the flow. Further, as in the fifth embodiment, the refrigerant flows to the indoor heat exchanger 13 without flowing through the pipe 53.

  On the other hand, during heating, the capillary tube 26 expands the refrigerant flowing from one end 261 and gives this to the other end 262. At this time, the pressure at the other end 262 is lower than the pressure at the one end 261, and a pressure difference is generated between both ends 261 and 262 of the capillary tube 26. However, since the check valve 34 is provided, the refrigerant does not flow through the heat exchanger 4.

  According to such a heat exchange system, only the refrigerant before being expanded by the expansion valve 15 is given to the heat exchanger 4 regardless of whether cooling or heating is performed. Therefore, the secondary cooling object 42 provided in the heat exchanger 4 can be cooled at a temperature higher than the dew point, thereby preventing dew condensation.

Seventh embodiment.
FIG. 13 conceptually shows a heat exchange system that performs the refrigerant according to the present embodiment. The heat exchange system includes an outdoor heat exchanger 12, an indoor heat exchanger 13, a compressor 11, an expansion valve 15, a heat exchanger 4, and pipes 52 and 54.

  Here, the outdoor heat exchanger 12 and the indoor heat exchanger 13 function as a condenser and an evaporator, respectively.

  The compressor 11 is provided between the outdoor heat exchanger 12 and the indoor heat exchanger 13 and compresses the refrigerant.

  The pipe 54 connects the discharge side 111 of the compressor 11 to the outdoor heat exchanger 12 via the heat exchanger 4.

  The expansion valve 15 is provided between the outdoor heat exchanger 12 and the indoor heat exchanger 13 on the side opposite to the compressor 11, and expands the refrigerant condensed in the outdoor heat exchanger 12 here. The heat is supplied to the indoor heat exchanger 13.

  The pipe 52 connects the outdoor heat exchanger 12 to the expansion valve 15 via the heat exchanger 4.

  According to such a heat exchange system, the discharge gas from the compressor 11 and the refrigerant before being expanded by the expansion valve 15 are given to the heat exchanger 4, so the temperature is lower than the discharge gas and higher than the dew point. The secondary cooling object 42 provided in the heat exchanger 4 can be cooled by temperature. Therefore, no condensation occurs on the secondary cooling target 42.

  FIG. 14 conceptually shows a heat exchange system that performs heating according to the present embodiment. The heat exchange system includes an outdoor heat exchanger 12, an indoor heat exchanger 13, a compressor 11, an expansion valve 15, a heat exchanger 4, and pipes 52 and 55.

  Here, the outdoor heat exchanger 12 and the indoor heat exchanger 13 function as an evaporator and a condenser, respectively.

  The pipe 55 connects the discharge side 111 of the compressor 11 to the indoor heat exchanger 13 via the heat exchanger 4.

  Here, the expansion valve 15 expands the refrigerant condensed in the indoor heat exchanger 13 and supplies it to the outdoor heat exchanger 12.

  According to such a heat exchange system, since the discharge gas from the compressor 11 and the refrigerant after being expanded by the expansion valve 15 are given to the heat exchanger 4, it is lower than the case of cooling (FIG. 13). The secondary cooling object 42 can be cooled at a temperature higher than the dew point. During heating, the normal outside air temperature is low and the dew point is lowered, so the temperature is higher than the dew point. Therefore, the secondary cooling object 42 provided outside the room can be efficiently cooled without causing condensation.

  In any of the heat exchange systems described above, the connection relationship between the compressor 11, the outdoor heat exchanger 12, and the indoor heat effector 13 can be grasped as follows. That is, the discharge side 111 of the compressor 11 is connected to one of the outdoor heat exchanger 12 and the indoor heat exchanger 13 that functions as a condenser.

  FIG. 15 shows a mode in which a switching valve 14 is further provided to the heat exchange system (FIGS. 13 and 14) described above. The switching valve 14 selects whether the discharge side 111 of the compressor 11 is connected to the outdoor heat exchanger 12 or the indoor heat exchanger 13. That is, switching between cooling and heating is possible.

  In the heat exchange system, a pipe 56 is employed as the pipes 54 and 55 described above. The pipe 56 connects the discharge side 111 of the compressor 11 to the switching valve 14 via the heat exchanger 4.

  According to such a heat exchange system, switching between cooling and heating is possible, and in any case, dew condensation on the secondary cooling object 42 can be prevented in the same manner as described above.

It is a figure which shows notionally the heat exchange system which performs air_conditioning | cooling demonstrated by 1st Embodiment. It is a figure which shows notionally the heat exchange system which performs heating demonstrated by 1st Embodiment. It is a figure which shows notionally the heat exchange system demonstrated by 2nd Embodiment. It is a figure which shows notionally the heat exchange system demonstrated by 2nd Embodiment. It is a figure which shows notionally the heat exchange system demonstrated by 3rd Embodiment. It is a figure which shows notionally the heat exchange system demonstrated by 3rd Embodiment. It is a figure which shows notionally the heat exchange system demonstrated by 3rd Embodiment. It is a figure which shows notionally the heat exchange system which performs air_conditioning | cooling demonstrated by 4th Embodiment. It is a figure which shows notionally the heat exchange system which performs heating demonstrated in 4th Embodiment. It is a figure which shows notionally the heat exchange system demonstrated by 4th Embodiment. It is a figure which shows notionally the heat exchange system demonstrated by 5th Embodiment. It is a figure which shows notionally the heat exchange system demonstrated by 6th Embodiment. It is a figure which shows notionally the heat exchange system which performs air_conditioning | cooling demonstrated by 7th Embodiment. It is a figure which shows notionally the heat exchange system which performs heating demonstrated in 7th Embodiment. It is a figure which shows notionally the heat exchange system demonstrated by 7th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Compressor 12 Outdoor heat exchanger 13 Indoor heat exchanger 15 Expansion valve 21, 22, 23, 24, 25, 26 Capillary tube 211, 221 One end 212, 222 Other end 111 Discharge side 31, 32, 33, 34 Check valve 52, 53, 54, 55, 56 Piping

Claims (13)

An outdoor heat exchanger (12) which is a heat exchanger provided outdoors;
An indoor heat exchanger (13) which is a heat exchanger provided indoors;
A compressor (11) that is provided between the outdoor heat exchanger and the indoor heat exchanger and compresses a refrigerant;
An expansion valve (15) provided between the indoor heat exchanger and the outdoor heat exchanger on the side opposite to the compressor;
A first capillary tube (21) having one end (211) connected between the outdoor heat exchanger and the expansion valve, and the other end (212);
A second capillary tube (22) having one end (221) connected between the indoor heat exchanger and the expansion valve, and the other end (222);
The discharge side (111) of the compressor is connected to one of the outdoor heat exchanger and the indoor heat exchanger that functions as a condenser,
Of the first and second capillary tubes, the one end bypasses one (21; 22) connected between the condenser (12; 13) and the expansion valve to bypass the condenser and the A heat exchange system in which the refrigerant flows from between the expansion valves to the one other end (212, 222). A switching valve (14) for selecting whether the discharge side (111) of the compressor (11) is connected to the outdoor heat exchanger (12) or the indoor heat exchanger (13);
Bypassing the first capillary tube only in the direction from the space between the outdoor heat exchanger and the expansion valve (15) toward the other end (212) of the first capillary tube (21), The heat exchange system according to claim 1, further comprising a first check valve (31) for flowing refrigerant. A third capillary tube (23) configured in series with the first check valve (31);
The heat exchange system according to claim 2, wherein the series connection bypasses the first capillary tube (21).   The heat exchange system according to claim 3, wherein the third capillary tube (23) has a conductance larger than that of the first capillary tube (21).   Bypass the second capillary tube only in the direction from the space between the indoor heat exchanger (13) and the expansion valve (15) toward the other end (222) of the second capillary tube (22). The heat exchange system according to any one of claims 2 to 4, further comprising a second check valve (32) through which the refrigerant flows. A fourth capillary tube (24) that is connected in series with the second check valve (32);
The heat exchange system of claim 5, wherein the series connection bypasses the second capillary tube (22).   The heat exchange system according to claim 6, wherein the fourth capillary tube (24) has a conductance larger than that of the second capillary tube (22). An outdoor heat exchanger (12) which is a heat exchanger provided outdoors;
An indoor heat exchanger (13) which is a heat exchanger provided indoors;
A compressor (11) that is provided between the outdoor heat exchanger and the indoor heat exchanger and compresses a refrigerant;
An expansion valve (15) provided between the indoor heat exchanger and the outdoor heat exchanger on the side opposite to the compressor;
A third heat exchanger (4);
A first pipe (52) for connecting the outdoor heat exchanger to the expansion valve via the third heat exchanger;
A heat exchange system comprising: a second pipe (53) for connecting the indoor heat exchanger to the expansion valve via the third heat exchanger.   A switching valve (14) for selecting whether the discharge side (111) of the compressor (1) is connected to the outdoor heat exchanger (12) or the indoor heat exchanger (13); The heat exchange system according to claim 8. The second pipe (53) is provided only in the direction from the indoor heat exchanger (13) side to the expansion valve (15) side through the third heat exchanger (4). A first check valve (33) for flowing refrigerant;
The heat exchange system according to claim 9, further comprising a first capillary tube (25) connected in parallel to the second pipe including the first check valve. Provided in the first pipe (52) and only in the direction from the outdoor heat exchanger (12) side to the expansion valve (15) side through the third heat exchanger (4). A second check valve (34) for flowing refrigerant;
The heat exchange system according to claim 10, further comprising a second capillary tube (26) connected in parallel to the first pipe including the second check valve. An outdoor heat exchanger (12) which is a heat exchanger provided outdoors;
An indoor heat exchanger (13) which is a heat exchanger provided indoors;
A compressor (11) that is provided between the outdoor heat exchanger and the indoor heat exchanger and compresses a refrigerant;
An expansion valve (15) provided between the indoor heat exchanger and the outdoor heat exchanger on the side opposite to the compressor;
A third heat exchanger (4);
A first pipe (52) for connecting the outdoor heat exchanger to the expansion valve via the third heat exchanger;
A second discharge side (111) of the compressor is connected to one of the outdoor heat exchanger and the indoor heat exchanger functioning as a condenser via the third heat exchanger. A heat exchange system comprising pipes (54; 55; 56). There is further provided a switching valve (14) for selecting whether the discharge side (111) of the compressor (1) is connected to the outdoor heat exchanger (12) or the indoor heat exchanger (13). ,
The heat exchange system according to claim 12, wherein the second pipe (56) connects the discharge side to the switching valve.

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