JP2012193866A - Refrigeration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigeration device that has improved workability and ease of maintenance, and carries out a dual refrigeration cycle.SOLUTION: The refrigeration device 100 includes: a high-temperature side service valve (liquid pipe side service valve 5, suction side service valve 6) and a low-temperature side service valve (liquid pipe side service valve 11, suction side service valve 12) which are disposed separately on opposite side walls of an outdoor unit 14.

Description

  The present invention relates to a refrigeration apparatus that cascades two refrigeration cycles and performs a two-way refrigeration cycle.

  Conventionally, a refrigeration apparatus that performs a dual refrigeration cycle by cascading a high temperature side refrigerant circulation circuit (high temperature side refrigeration cycle) and a low temperature side refrigerant circulation circuit (low temperature side refrigeration cycle) via a cascade capacitor is known. . Such a refrigeration apparatus uses carbon dioxide (CO2) as a refrigerant circulating in the low temperature side refrigerant circulation circuit, uses R22 as a refrigerant circulating in the high temperature side refrigerant circulation circuit, and a part of the low temperature side refrigerant circulation circuit and In general, almost all of the high-temperature side refrigerant circulation circuit is housed in one housing (outdoor unit). The reason why carbon dioxide is used as the refrigerant circulating in the low-temperature side refrigerant circulation circuit is to realize a low GWP (global warming potential).

  As such, “a refrigeration system comprising an evaporator of a primary refrigerant circuit and a condenser of a secondary refrigerant circuit connected in a heat exchange manner and using carbon dioxide as a refrigerant in the secondary refrigerant circuit Then, after starting a compressor constituting the primary refrigerant circuit, a refrigeration apparatus that activates the compressor of the secondary refrigerant circuit after a predetermined time has been proposed (for example, Patent Document 1). reference).

JP 2004-190917 (page 14, FIG. 1)

  By the way, structural design of the outdoor unit is required considering the workers who install the outdoor unit (for example, new installation or model exchange) and the workers who perform maintenance (periodic maintenance, failure diagnosis, etc.) of the outdoor unit. ing. However, in the refrigeration apparatus described in Patent Document 1, since the low-temperature side refrigerant circulation circuit and the high-temperature side refrigerant circulation circuit are housed in the same housing, the wrong refrigerant is enclosed (for example, in the R22 machine) It was highly possible that carbon dioxide was included).

  In the refrigeration apparatus described in Patent Document 1, the design pressure differs between the low temperature side refrigerant circulation circuit and the high temperature side refrigerant circulation circuit (for example, carbon dioxide is 5.5 Mpa on the low temperature side, and R22 is on the high temperature side, for example. 2.5 Mpa). For this reason, a high air-pressure test circuit with high carbon dioxide is applied to the high-temperature refrigerant circulation circuit by mistake during service or trial operation, which may cause unnecessary problems with refrigeration cycle components such as expansion valves and refrigerant piping. Sometimes it took. Moreover, if the wrong refrigerant is sealed, there is a possibility that the refrigeration apparatus will not operate normally.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a refrigeration apparatus that performs a dual refrigeration cycle with improved workability and maintainability.

  The refrigeration apparatus according to the present invention includes a high temperature side compressor, a high temperature side condenser, a high temperature side expansion valve, and a high temperature side refrigerant circulation circuit in which a high temperature side evaporator is connected to a pipe, A high-temperature side refrigerant circulation circuit using a cascade condenser including the high-temperature side evaporator and the low-temperature side condenser. A refrigeration apparatus in which a circuit and the low-temperature side refrigerant circulation circuit are cascade-connected, between the high-temperature side condenser and the high-temperature side expansion valve, and between the high-temperature side evaporator and the high-temperature side compressor A high temperature side service valve, a low temperature side service valve between the low temperature side condenser and the low temperature side expansion valve, and a low temperature side service valve between the low temperature side evaporator and the low temperature side compressor. Compressor, high temperature side condenser, high temperature The expansion valve, the cascade condenser, the low temperature side compressor, the intercooler, the high temperature side service valve and the low temperature side service valve are installed in an outdoor unit, and the high temperature side service valve and the low temperature side service valve are It arrange | positions to each of the side wall vicinity which opposes among the side walls of an outdoor unit, It is characterized by the above-mentioned.

  According to the refrigeration apparatus of the present invention, the high temperature side service valve and the low temperature side service valve are arranged in the vicinity of the opposing side walls of the side walls of the outdoor unit, so that workability and maintainability can be improved. .

It is a refrigerant circuit figure which shows roughly the refrigerant circuit structure of the refrigeration apparatus which concerns on Embodiment 1 of this invention. It is an internal perspective figure which shows schematically an example of the internal structure of the outdoor unit which comprises the refrigeration apparatus which concerns on Embodiment 1 of this invention. It is an internal perspective figure which shows schematically an example of the internal structure of the outdoor unit which comprises the refrigeration apparatus which concerns on Embodiment 2 of this invention. It is CC sectional view taken on the line of the outdoor unit shown in FIG. It is an internal perspective figure which shows schematically an example of the internal structure of the low temperature side housing | casing renewally connected to the outdoor unit of the freezing apparatus which concerns on Embodiment 3 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a refrigerant circuit diagram schematically showing a refrigerant circuit configuration of a refrigeration apparatus 100 according to Embodiment 1 of the present invention. FIG. 2 is an internal perspective view schematically showing an example of the internal configuration of the outdoor unit 14 constituting the refrigeration apparatus 100. Based on FIG.1 and FIG.2, while explaining the structure and operation | movement of the freezing apparatus 100, the feature point of the outdoor unit 14 is demonstrated. The refrigeration apparatus 100 includes a low-temperature side refrigerant circulation circuit and a high-temperature side refrigerant circulation circuit, and performs a dual refrigeration cycle. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

[Constitution]
As shown in FIG. 1, the refrigeration apparatus 100 includes a high temperature side refrigerant circulation circuit A and a low temperature side refrigerant circulation circuit (load side circuit) B, and performs a dual refrigeration cycle by circulating the refrigerant in each. It has become. That is, the refrigeration apparatus 100 is configured by cascade-connecting the high temperature side refrigerant circulation circuit A and the low temperature side refrigerant circulation circuit B via the cascade capacitor 13. In the following description, the high temperature side refrigerant circulation circuit A is referred to as “high temperature side circuit A”, and the low temperature side refrigerant circulation circuit B is referred to as “low temperature side circuit B”.

(High temperature side circuit A)
The high temperature side circuit A is formed by connecting a high temperature side compressor 1, a high temperature side condenser 2, a high temperature side expansion valve 3, and a high temperature side evaporator 4 in series with a high temperature side refrigerant pipe 51. Yes. Further, in the high temperature side circuit A, the liquid pipe side (high temperature) service valve 5 is provided in the liquid piping portion on the outlet side of the high temperature side condenser 2, and the suction side (high temperature) service valve 6 is provided on the suction side of the high temperature side compressor 1. Are provided respectively. For example, HFC (hydrofluorocarbon) refrigerant, HFO (hydrofluoroolefin) refrigerant, HC (hydrocarbon) refrigerant, or the like is used as the refrigerant circulating in the high-temperature side refrigerant circulation circuit A. As HFC refrigerants, there are R404A, R32, R407C and the like in addition to R410A.

  The high temperature side compressor 1 sucks the refrigerant flowing through the high temperature side circuit A, and compresses the refrigerant to bring it into a high temperature / high pressure state. The high temperature side condenser 2 performs heat exchange between the refrigerant discharged from the high temperature side compressor 1 and a fluid (for example, air, water, refrigerant, brine, etc.) and gives heat to the fluid. The high temperature side expansion valve 3 decompresses and expands the refrigerant flowing out of the high temperature side condenser 2. The high temperature side evaporator 4 performs heat exchange between the refrigerant decompressed by the high temperature side expansion valve 3 and the refrigerant (the refrigerant circulating in the low temperature side circuit B), and absorbs heat from the refrigerant.

  The liquid pipe side service valve 5 is installed on the outlet side of the high temperature side condenser 2 and on the upstream side of the high temperature side expansion valve 3. The liquid pipe side service valve 5 is used to perform operations such as evacuation of the high temperature side circuit A and filling of refrigerant into the high temperature side circuit A. The suction side service valve 6 is installed on the suction side of the high temperature side compressor 1 and on the downstream side of the high temperature side evaporator 4. This suction side service valve 6 is also used to perform operations such as evacuation of the high temperature side circuit A and filling of refrigerant into the high temperature side circuit A, like the liquid pipe side service valve 5.

(Low temperature side circuit B)
The low temperature side circuit B includes a low temperature side compressor 7, an intercooler 8, a low temperature side condenser 9, a liquid receiver 10, a low temperature side expansion valve 16, and a low temperature side evaporator 17 in series. The side refrigerant pipe 52 is formed by pipe connection. Further, in the low temperature side circuit B, a liquid pipe side (low temperature) service valve 11 is provided in the liquid piping portion on the outlet side of the liquid receiver 10, and a suction side (low temperature) service valve 12 is provided on the suction side of the low temperature side compressor 7. , Each provided. For example, carbon dioxide (CO2) refrigerant or the like is used as the refrigerant circulating in the low temperature side circuit B. In addition, as a refrigerant | coolant used for the low temperature side circuit B, although a carbon dioxide is preferable, it is not limited to this.

  The low temperature side compressor 7 sucks the refrigerant flowing through the low temperature side circuit B, and compresses the refrigerant to bring it into a high temperature / high pressure state. The intercooler 8 exchanges heat between the refrigerant discharged from the low temperature side compressor 7 and a fluid (for example, air, water, refrigerant, brine, etc.), and gives heat to the fluid. The low temperature side condenser 9 performs heat exchange between the refrigerant flowing out from the intercooler 8 and the fluid (refrigerant circulating in the high temperature side circuit A), and gives heat to the fluid. The liquid receiver 10 is for storing surplus refrigerant among the refrigerant that has flowed out of the low-temperature side condenser 9. The low temperature side expansion valve 16 decompresses and expands the refrigerant flowing out of the liquid receiver 10. The low temperature side evaporator 17 exchanges heat between the refrigerant decompressed by the low temperature side expansion valve 16 and the refrigerant (for example, air, water, refrigerant, brine, etc.), and absorbs heat from the refrigerant.

  The liquid pipe side service valve 11 is installed on the outlet side of the liquid receiver 10 and on the upstream side of the low temperature side expansion valve 16. The liquid pipe side service valve 11 is used to perform operations such as evacuation of the low temperature side circuit B and filling of the refrigerant into the low temperature side circuit B. The suction side service valve 12 is installed on the suction side of the low temperature side compressor 7 and on the downstream side of the low temperature side evaporator 17. The suction side service valve 12 is also used to perform operations such as evacuation of the low temperature side circuit B and filling of the refrigerant into the low temperature side circuit B, similarly to the liquid pipe side service valve 11.

(Outdoor unit 14)
The outdoor unit 14 accommodates all of the component devices constituting the high temperature side circuit A and a part of the low temperature side circuit B. All of the component devices constituting the high temperature side circuit A are accommodated in the high temperature side casing 19 constituting the outdoor unit 14, and a part of the low temperature side circuit B is accommodated in the low temperature side casing 20. The high temperature side casing 19 and the low temperature side casing 20 are configured by casings having the same outer shape. Moreover, the high temperature side housing | casing 19 and the low temperature side housing | casing 20 share the bottom plate with the common mount 21, while comprising the external shape with the same housing | casing. The high temperature side housing 19 and the low temperature side housing 20 are installed adjacent to each other on the common frame 21.

  As described above, the high temperature side circuit A and the low temperature side circuit B are cascade-connected by the cascade capacitor 13. That is, the cascade condenser in which the low temperature side condenser 9 of the low temperature side circuit B becomes the high temperature side evaporator 4 of the high temperature side circuit A and the high temperature side evaporator 4 of the high temperature side circuit A becomes the low temperature side condenser 9 of the low temperature side circuit B. 13 is provided as a common element of both circuits. This cascade capacitor 13 is desirably housed in the low temperature side housing 20 so that it can be renewably connected to the existing high temperature side housing 19.

(High temperature side housing 19)
The high temperature side casing 19 includes a high temperature side blower 22, a high temperature side control, in addition to a high temperature side compressor 1, a high temperature side condenser 2, a high temperature side expansion valve 3, a liquid pipe side service valve 5 and a suction side service valve 6. A controller 24 is installed. The high temperature side blower 22 is installed in the upper part of the high temperature side housing 19 and supplies air to the high temperature side condenser 2. The high temperature side controller 24 executes various controls of the high temperature side equipment. Further, a high temperature side controller operation switch 25 for receiving an instruction to the high temperature side controller 24 is provided around or inside the high temperature side controller 24.

  A display board (not shown) on which the type name of the refrigerant used in the high temperature side circuit A, for example, R410A, is installed on the appearance part (outer wall) of the high temperature side housing 19. In addition, a display board (not shown) on which the type of refrigerant used in the high temperature side circuit A is also installed in the vicinity of the liquid pipe side service valve 5 and the suction side service valve 6. By doing in this way, it is suppressing that an operator mistakes the kind of refrigerant | coolant currently used.

  Further, as shown in FIG. 2, the liquid pipe side service valve 5 and the suction side service valve 6 are located in the vicinity of the right side wall of the high temperature side housing 19 (near the side wall on the side away from the low temperature side housing 20). It is better to place it. If the liquid pipe side service valve 5 and the suction side service valve 6 are installed at such positions, this contributes to improvement in workability and maintenance. That is, an operator who installs the outdoor unit 14 (for example, new installation or model exchange) or an operator who performs maintenance (periodic maintenance, failure diagnosis, etc.) of the outdoor unit 14 encloses the wrong refrigerant. Can be reduced. In addition, it is good to arrange | position the sight glass (not shown) and dryer (not shown) for local piping connection in the high temperature side housing | casing 19. FIG.

(Low temperature side housing 20)
In addition to the low temperature side compressor 7, the intermediate cooler 8, the liquid receiver 10, the liquid pipe side service valve 11 and the suction side service valve 12, the low temperature side casing 20 includes a low temperature side blower 23, a low temperature side controller 26. Is installed. The low temperature side blower 23 is installed on the upper part of the low temperature side housing 20 and supplies air to the intercooler 8. The low temperature side controller 26 executes various controls of the low temperature side equipment. A low temperature side controller operation switch 27 for receiving an instruction to the low temperature side controller 26 is provided around or inside the low temperature controller 26. In addition, a display board (not shown) on which the type name of the refrigerant being used is described is installed on the external portion (outer wall) of the low-temperature side casing 20.

  A cascade capacitor 13 that cascade-connects the high temperature side circuit A and the low temperature side circuit B is also installed in the low temperature side housing 20. As described above, the cascade capacitor 13 is preferably installed in the low temperature side casing 20, but may be installed in the high temperature side casing 19. Even if it installs in any housing | casing, the cascade capacitor | condenser 13 is installed in the approximate center part on the common mount frame 21. FIG. As shown in FIG. 2, the inlet / outlet pipe 51 a of the high temperature side evaporator 4 is provided near the high temperature side refrigerant pipe 51, and the inlet / outlet pipe 52 a of the low temperature side condenser 9 is provided near the low temperature side refrigerant pipe 52. .

  A display board (not shown) on which the type name of the refrigerant used in the low-temperature side circuit B, for example, carbon dioxide, is installed is installed on the external portion (outer wall) of the low-temperature side housing 20. Further, a display board (not shown) on which the type of refrigerant used in the low temperature side circuit B is also installed in the vicinity of the liquid pipe side service valve 11 and the suction side service valve 12. By doing in this way, it is suppressing that an operator mistakes the kind of refrigerant | coolant currently used.

  Further, as shown in FIG. 2, the liquid pipe side service valve 11 and the suction side service valve 12 are located in the vicinity of the left side wall of the low temperature side casing 20 (near the side wall on the side away from the high temperature side casing 19). It is better to place it. If the liquid pipe side service valve 11 and the suction side service valve 12 are installed in such a position, it contributes to improvement of workability and maintainability. That is, a worker who installs the outdoor unit 14 (for example, new installation or model exchange), a worker who performs maintenance (periodic maintenance, failure diagnosis, etc.) of the outdoor unit 14, and renewal connection of the low-temperature side housing 20 It is possible to reduce the possibility that the worker who performs the operation will enclose the wrong refrigerant. In addition, it is good to arrange | position the sight glass (not shown) and dryer (not shown) for local piping connection in the low temperature side housing | casing 20. FIG.

(Load side unit 18)
A part of the low temperature side circuit B is accommodated in the load side unit 18. Specifically, the low temperature side expansion valve 16 and the low temperature side evaporator 17 are accommodated in the load side unit 18. A liquid pipe solenoid valve 15 is provided between the liquid pipe side service valve 11 and the low temperature side expansion valve 16. The load side unit 18 is used as a showcase or a unit cooler, for example. The liquid pipe solenoid valve 15 is used to perform operations such as evacuation of the low temperature side circuit B and filling of the refrigerant into the low temperature side circuit B, as with other low temperature side service valves.

[Operation]
(Operation of high-temperature circuit A)
The refrigerant that has been compressed by the high temperature side compressor 1 to become high temperature and high pressure flows into the high temperature side condenser 2. In the high temperature side condenser 2, the refrigerant exchanges heat with a fluid (here, air) to condense, and becomes a low temperature / high pressure refrigerant. The refrigerant flowing out from the high temperature side condenser 2 is decompressed by the high temperature side expansion valve 3 and becomes a low temperature / low pressure refrigerant and flows into the high temperature side evaporator 4 configured as the cascade capacitor 13. In the high temperature side evaporator 4, the refrigerant exchanges heat with a fluid (here, the refrigerant circulating in the low temperature side circuit B) and evaporates to become a high temperature / low pressure refrigerant. At this time, the refrigerant circulating in the low temperature side circuit B is cooled. Then, the refrigerant flowing out from the high temperature side evaporator 4 is sucked into the high temperature side compressor 1 again.

(Operation of low-temperature circuit B)
The refrigerant that has been compressed by the low temperature side compressor 7 to a high temperature and high pressure flows into the intercooler 8. In the intermediate cooler 8, the refrigerant is cooled by releasing heat, and the temperature is slightly lowered. The refrigerant cooled by the intercooler 8 flows into the low temperature side condenser 9 configured as a cascade condenser 13. In the low-temperature side condenser 9, the refrigerant is condensed by exchanging heat with a fluid (here, the refrigerant circulating in the high-temperature side circuit A) to become a low-temperature and high-pressure refrigerant. At this time, the refrigerant circulating in the high temperature side circuit A is heated.

  The refrigerant that has flowed out of the low temperature side condenser 9 flows into the liquid receiver 10. A part of the refrigerant flowing into the liquid receiver 10 is stored as surplus refrigerant, and the rest is decompressed by the low temperature side expansion valve 16 and flows into the low temperature side evaporator 17 as low temperature / low pressure refrigerant. In the low temperature side evaporator 17, the refrigerant evaporates by exchanging heat with the fluid (here, air), and becomes a high temperature / low pressure refrigerant. At this time, the space to be cooled is cooled in the load side unit 18. Then, the refrigerant flowing out from the low temperature side evaporator 17 is sucked into the low temperature side compressor 7 again.

[effect]
The outdoor unit 14 arranges the liquid pipe side service valve 5 and the suction side service valve 6 for service of the high temperature side circuit A on the right side of the high temperature side casing 19, that is, at a position away from the low temperature side casing 20. Since the display plate in which the kind of the refrigerant is described is installed in the vicinity of the external part of the casing 19, the liquid pipe side service valve 5 and the suction side service valve 6, Inadvertently performing an airtight test at the time of service is suppressed, and workability and maintainability are improved.

  Similarly, the outdoor unit 14 arranges the liquid pipe side service valve 11 for service of the low temperature side circuit B and the suction side service valve 12 on the left side of the low temperature side housing 20, that is, at a position away from the high temperature side housing 19. Since the display plate with the refrigerant type is installed in the vicinity of the external portion of the low temperature side housing 20, the liquid pipe side service valve 11 and the suction side service valve 12, the refrigerant to be sealed in the low temperature side circuit B is mistaken. Or erroneously performing the airtight test at the time of service, and workability and maintainability are improved.

  As described above, according to the refrigeration apparatus 100, since the outdoor unit 14 is provided, it is possible to first visually appeal to the worker the type of refrigerant that must be sealed in each of the high temperature side circuit A and the low temperature side circuit B. This makes it possible to reduce mistakes in refrigerant charging. And since each service valve is installed in the both sides | surfaces of the outdoor unit 14, it becomes possible not only to reduce the mistake of enclosure of a refrigerant | coolant but to reduce the mistake at the time of the airtight test at the time of service. Therefore, according to the refrigeration apparatus 100, the workability and maintainability for local workers are greatly improved.

  It should be noted that if the high temperature side service valve and the low temperature side service valve are made distinguishable (for example, a mark or a color is changed), mistakes in service work can be further suppressed. Further, the cascade capacitor 13 extending over both the high temperature side and the low temperature side may be arranged in either the high temperature side casing 19 or the low temperature side casing 20 in consideration of the arrangement condition or the like. Furthermore, since the high temperature side housing 19 and the low temperature side housing 20 have the same outer shape, the sheet metal structure is the same, leading to cost reduction.

  Since the high temperature side controller 24 is arranged in the high temperature side casing 19 and the low temperature side controller 26 is arranged in the low temperature side casing 20, and the operation switch of each controller is provided in each controller, the high temperature side circuit A Even if a problem occurs, only the low temperature side circuit B is operated to enable emergency operation. In addition, when the high temperature side circuit A is in service, the high temperature side circuit A can be serviced while the low temperature side circuit B is continuously operated. Furthermore, the existing high temperature side housing | casing 19 can be utilized, and the low temperature side housing | casing 20 can be renewally connected and a dual refrigeration cycle can also be constructed | assembled.

  As a manufacturing method of the outdoor unit 14, first, the low temperature side circuit B in the low temperature side casing 20 is completed, and after the airtight test of the low temperature side circuit B and the refrigerant filling, the high temperature side circuit A in the high temperature side casing 19 is completed. The high-temperature side circuit A and the low-temperature side circuit B are connected, and the air-tightness test of the high-temperature side circuit A and the refrigerant sealing are good. According to such a production method, since the line process of the production line of the high temperature side housing 19 and the production line of the low temperature side housing 20 are different, the airtight test and the refrigerant filling can be executed without mistake. However, the high temperature side circuit A may be completed first, and then the low temperature side circuit B may be completed.

  In the first embodiment, the case where the liquid receiver 10 is connected as one of the components of the low temperature side circuit B has been described as an example. However, the present invention is not limited to this, and the liquid receiver 10 is not necessarily limited. It is not necessary to connect. Further, a liquid receiver such as an accumulator may be connected to the suction side of the low temperature side compressor 7 instead of the liquid receiver 10. In other words, the liquid receiver may determine the presence or absence of connection and the selection of the type depending on the application of the refrigeration apparatus 100, the refrigerant used, and the like.

Embodiment 2. FIG.
FIG. 3 is an internal perspective view schematically showing an example of the internal configuration of the outdoor unit 14A configuring the refrigeration apparatus according to Embodiment 2 of the present invention. 4 is a cross-sectional view of the outdoor unit 14A shown in FIG. Based on FIG.3 and FIG.4, the feature point of outdoor unit 14A is demonstrated. In the second embodiment, the difference from the first embodiment will be mainly described, and the same parts as those in the first embodiment are denoted by the same reference numerals.

  The circuit configuration of the refrigeration apparatus according to Embodiment 2 is the same as that of refrigeration apparatus 100 according to Embodiment 1. However, the refrigeration apparatus according to the second embodiment is different from the refrigeration apparatus 100 according to the first embodiment in how the high temperature side condenser 2 and the intercooler 8 are installed. That is, in the refrigeration apparatus 100 according to Embodiment 1, all of the high-temperature side condenser 2 is installed in the high-temperature side casing 19 and all of the intermediate cooler 8 is installed in the low-temperature side casing 20, but Embodiment 2 In the refrigeration apparatus according to the above, a part of the high temperature side condenser 2 is installed in a low temperature side casing (hereinafter referred to as a low temperature side casing 20A).

  Usually, the ratio of the processing capacity of the high temperature side condenser 2 of the high temperature side circuit A and the processing capacity of the intermediate cooler 8 of the low temperature side circuit B is about 7: 3. Therefore, in the second embodiment, a part of the high temperature side condenser 2 is also installed in the low temperature side housing 20A according to the ratio between the processing capacity of the high temperature side condenser 2 and the processing capacity of the intermediate cooler 8. I have to. That is, the number of stages or the number of columns of the heat exchanger constituting the intermediate cooler 8 is adjusted, and a part of the heat exchanger functions as the high temperature side condenser 2. As a method of dividing the high temperature side condenser 2 of the high temperature side circuit A and the intermediate cooler 8 of the low temperature side circuit B, for example, there are methods shown in FIGS.

  When the intermediate cooler 8 and the high temperature side condenser 2 are divided by the number of stages, as shown in FIG. 3, the heat exchanger is divided into upper and lower parts, the upper part being the intermediate cooler 8 and the lower part being one of the high temperature side condenser 2. What is necessary is just to function as a part. Further, when the number of rows of the intermediate cooler 8 and the high temperature side condenser 2 is divided, as shown in FIG. 4, the intermediate cooler 8 and the high temperature side condenser 2 are configured by a heat exchanger having a substantially U-shaped planar shape. Then, the intermediate cooler 8 may be installed on the inner side, and the high temperature side condenser 2 may be installed on the outer side. The intermediate cooler 8 and the high temperature side condenser 2 may be configured by a heat exchanger whose planar shape is substantially L-shaped or substantially single-shaped. And it is desirable to adjust the number of upper and lower stages or the number of rows so that the same type of fan can be used for the high temperature side fan 22 and the low temperature side fan 23.

  As described above, according to the refrigeration apparatus according to the second embodiment, not only the workability and maintainability for local workers are dramatically improved, but also the processing capacity of the high-temperature side condenser 2 and the intercooler 8 is improved. As a result, the overall efficiency is further improved. Further, according to the refrigeration apparatus according to Embodiment 2, since the same type of blower can be used for the high temperature side blower 22 and the low temperature side blower 23, it is not necessary to install a blower having different power in each casing. This leads to further cost reduction.

Embodiment 3 FIG.
FIG. 5 is an internal perspective view schematically showing an example of an internal configuration of a low-temperature side casing (hereinafter referred to as a low-temperature side casing 20B) renewally connected to the outdoor unit of the refrigeration apparatus according to Embodiment 3 of the present invention. It is. Based on FIG. 5, the characteristic point of the low temperature side housing | casing 20B, ie, the renewal connection of the low temperature side housing | casing 20B, is demonstrated. In the third embodiment, the difference from the first embodiment and the second embodiment described above will be mainly described, and the same parts as those in the first embodiment and the second embodiment are denoted by the same reference numerals. is doing.

  The refrigeration apparatus according to Embodiment 1 and Embodiment 2 includes the high-temperature side circuit A and the low-temperature side circuit B, and the binary refrigeration cycle has already been constructed. However, the refrigeration according to Embodiment 3 The apparatus is configured to newly construct a dual refrigeration cycle by renewally connecting the low temperature side casing 20B to the existing high temperature side casing. That is, the low-temperature side casing 20B and the common mount 21 can be retrofitted to an existing refrigeration apparatus, so that the two-stage refrigeration cycle can be changed. The configuration of the low-temperature side casing 20B is the same as that of the low-temperature side casing 20 described in the first embodiment.

  Specifically, the outdoor unit constituting the refrigeration apparatus already installed on site is connected to the high temperature side expansion valve 3 and the cascade condenser via the liquid pipe side service valve 5 and the suction side service valve 6 at that site. The high temperature side evaporator 4 in 13 is connected. By doing so, it is possible to construct a two-way refrigeration cycle using a refrigeration apparatus already installed on site. If a carbon dioxide refrigerant is used for the low temperature side circuit B, low GWP can also be realized.

  As described above, according to the refrigeration apparatus according to Embodiment 3, workability for local workers when the low temperature side housing 20B is renewally connected to an existing outdoor unit is dramatically improved. Moreover, according to the refrigeration apparatus to which the low-temperature side casing 20B is connected, not only the workability for the local worker but also the maintainability is dramatically improved. Furthermore, if the configuration of the low temperature side casing 20B is the same as the configuration of the low temperature side casing 20A according to Embodiment 2, the processing capabilities of the high temperature side condenser 2 and the intermediate cooler 8 can be further exhibited. The efficiency as a whole will be further improved, leading to further cost reduction.

  In addition, although the freezing apparatus of this invention was divided and demonstrated to Embodiment 1-Embodiment 3, you may make it combine the characteristic matter of each embodiment suitably.

  1 High temperature side compressor, 2 High temperature side condenser, 3 High temperature side expansion valve, 4 High temperature side evaporator, 5 Liquid pipe side service valve, 6 Suction side service valve, 7 Low temperature side compressor, 8 Intermediate cooler, 9 Low temperature Side condenser, 10 liquid receiver, 11 liquid pipe side service valve, 12 suction side service valve, 13 cascade condenser, 14 outdoor unit, 14A outdoor unit, 15 liquid pipe solenoid valve, 16 low temperature side expansion valve, 17 low temperature side evaporation , 18 Load side unit, 19 High temperature side case, 20 Low temperature side case, 20A Low temperature side case, 20B Low temperature side case, 21 Common mount, 22 High temperature side blower, 23 Low temperature side blower, 24 High temperature side controller , 25 High temperature side controller operation switch, 26 Low temperature side controller, 27 Low temperature side controller operation switch, 51 High temperature side cooling Piping, 51a doorway pipe, 52 low temperature-side refrigerant pipe, 52a doorway pipe, 100 refrigeration system, A high-temperature side refrigerant circulation circuit, B the low temperature-side refrigerant circulation circuit.

Claims (8)

A high temperature side refrigerant circulation circuit in which a high temperature side compressor, a high temperature side condenser, a high temperature side expansion valve, and a high temperature side evaporator are connected by piping;
A low-temperature side compressor, an intercooler, a low-temperature side condenser, a low-temperature side expansion valve, and a low-temperature side refrigerant circulation circuit piped to the low-temperature side evaporator,
A refrigeration apparatus in which the high temperature side refrigerant circulation circuit and the low temperature side refrigerant circulation circuit are cascade-connected with a cascade condenser including the high temperature side evaporator and the low temperature side condenser,
A high temperature side service valve is provided between the high temperature side condenser and the high temperature side expansion valve, and between the high temperature side evaporator and the high temperature side compressor,
A low temperature side service valve is provided between the low temperature side condenser and the low temperature side expansion valve, and between the low temperature side evaporator and the low temperature side compressor,
The high temperature side compressor, the high temperature side condenser, the high temperature side expansion valve, the cascade condenser, the low temperature side compressor, the intermediate cooler, the high temperature side service valve, and the low temperature side service valve are installed in an outdoor unit. ,
The refrigeration apparatus, wherein the high temperature side service valve and the low temperature side service valve are arranged in the vicinity of opposing side walls of the outdoor unit. The outdoor unit is
It has a common base and is composed of an adjacent high-temperature side case and low-temperature side case,
The high temperature side service valve is
Of the side walls of the high temperature side casing, disposed in the vicinity of the side wall facing the side wall adjacent to the low temperature side casing,
The low temperature service valve is
2. The refrigeration apparatus according to claim 1, wherein the refrigeration apparatus is disposed in the vicinity of the side wall of the low-temperature side casing that faces the side wall adjacent to the high-temperature side casing. In the high temperature side housing,
The high temperature side compressor, the high temperature side condenser, the high temperature side expansion valve and the high temperature side service valve are accommodated,
In the low temperature side housing,
The low temperature side compressor, the intercooler, the cascade condenser and the low temperature side service valve are accommodated,
The refrigeration apparatus according to claim 2, wherein the low-temperature side casing is separable from the gantry. A part of the heat exchanger constituting the intermediate cooler is made to function as a part of the high temperature side condenser according to the ratio of the processing capacity between the high temperature side condenser and the intermediate cooler. The refrigeration apparatus according to any one of claims 1 to 3. 5. The processing capacity of the intermediate cooler and the high-temperature side condenser is adjusted by dividing the number of stages or the number of rows of heat exchangers constituting the intermediate cooler. Refrigeration equipment. The high temperature side case and the low temperature side case are:
The refrigeration apparatus according to any one of claims 1 to 5, wherein the refrigeration apparatus is configured by a casing having the same outer shape. The operation switch is provided, and a controller for controlling each refrigerant circulation circuit is installed in each of the high temperature side casing and the low temperature side casing. The refrigeration apparatus described. The display board with which the refrigerant | coolant kind currently used for each refrigerant | coolant circulation circuit was described was installed in the vicinity of the outer wall of the said housing | casing, and the said service valve. The refrigeration apparatus according to item.

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