JP2002181406A - Refrigerating equipment and heat source unit for refrigerating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the general-purpose application of refrigerating equipment. SOLUTION: A heat source unit (11) is provided with a first system part (47) having a terminal, which is constituted so as to be connectable to a first system (1), and a second system part (48) having a terminal, which is constituted so as to be connectable to a second system (2) conducting only an absorption operation. The liquid side of the part (47) is connected to an outdoor heat exchanger (32), and the gas side thereof is connected by switchover to the discharge side and the suction side of compressors (41, 42). The liquid side of the part (48) is connected to the heat exchanger (32), and the gas side is connected to the suction side of the compressors (41, 42).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system and a heat source unit for the refrigeration system, and more particularly to a refrigerant circuit configuration for simultaneously absorbing and releasing heat.

[0002]

2. Description of the Related Art Conventionally, refrigeration systems have been
As disclosed in -39230, a plurality of use units are connected to one heat source unit, and some of the use units perform an endothermic operation and a heat dissipation operation,
There is known a so-called multi-type in which another use unit performs only the heat absorbing operation. This type of refrigerating apparatus performs a heat dissipation operation by connecting a use unit that performs an endothermic operation and a heat dissipation operation and a use unit that performs only an endothermic operation with a liquid pipe, a high-temperature gas pipe, and a low-temperature gas pipe. The cold heat obtained in the use unit is directly supplied to other use units that perform the endothermic operation. This type of refrigerating apparatus is installed in, for example, a convenience store and is used as a refrigerating apparatus that simultaneously performs air conditioning in a store and cooling in a freezer.

[0003]

However, this type of refrigeration system is designed as a whole, and connects the heat source unit and each utilization unit via a liquid pipe, a high-temperature gas pipe, and a low-temperature gas pipe. In addition, the existing utilization unit cannot be used because the utilization unit that performs the heat absorption operation and the heat radiation operation and the utilization unit that performs only the heat absorption operation are integrally configured. There was a problem that lacked.

[0004] The present invention has been made in view of the above points, and has as its object to improve versatility.

[0005]

According to the present invention, there are provided a system (1) for performing heat absorption and heat dissipation, and a system (2) for performing only heat absorption operation.
And the two systems are separately connected to the heat source unit (11).

Specifically, a first solution is a first system section (47) having an end configured to be connectable to a first system (1) that switches between an endothermic operation and a heat dissipation operation; A second system (48) having an end configured to be connectable to a second system (2) that performs only operation.

A second solution is the first solution, wherein the compressor (41, 42) and the heat source side heat exchanger (3
2), and one end of the heat source side heat exchanger (32) is connected to switch between the discharge side and the suction side of the compressor (41, 42), while the first system section (47) The liquid side is connected to the heat source side heat exchanger (32), and the gas side of the first system part (47) is connected so that the discharge side and the suction side of the compressor (41, 42) are switched. The liquid side of the second system part (48) is connected to the heat source side heat exchanger (32), and the gas side of the second system part (48) is connected to the suction side of the compressors (41, 42). Have been.

[0008] The third solution is the second solution, wherein the liquid side and the gas side ends of the first system section (47) and the liquid side and the gas end of the second system section (48). Open / close valves (35, 36, 37, 38) are provided at the ends on the sides.

Further, the fourth solution means is connected to any one of the first to third refrigeration system heat source units (11) and the refrigeration system heat source unit (11) to perform heat absorption operation and heat radiation. A first system (1) that switches to an operation and a second system (2) that is connected to the heat source unit for a refrigeration apparatus (11) and performs only an endothermic operation.

According to a fifth aspect, in the fourth aspect, the first system (1) extends from the refrigeration unit heat source unit (11) to the outside of the refrigeration unit heat source unit (11). A liquid pipe (21) and a gas pipe (22) are provided so as to be switched between an endothermic operation and a heat radiation operation. The second system (2) is provided from the refrigeration unit heat source unit (11) to the refrigeration unit. Liquid piping (23) extending outside the heat source unit (11)
And a gas pipe (24) so as to perform only an endothermic operation.

The refrigeration system (10) is premised on a refrigeration system having a refrigerant circuit (20) having a heat source unit (11) capable of reversible operation, and the refrigerant circuit (20) has a heat source unit (11). May be provided with a first system (1) that switches between an endothermic operation and a heat dissipation operation, and a second system (2) that performs only the endothermic operation.

The refrigeration system (10) is premised on a refrigeration system having a refrigerant circuit (20) having a heat source unit (11) capable of reversible operation, and the refrigerant circuit (20) has a heat source unit (11). 1st system (1) and 2nd system (2) connected to
The first system (1) includes a heat source unit (11)
Liquid pipe (21) extending from the heat source unit (11) to the outside of the heat source unit (11)
And a gas pipe (22). The second system (2) includes a liquid extending from the heat source unit (11) to the outside of the heat source unit (11). It may be configured to include the pipe (23) and the gas pipe (24) and perform only the heat absorbing operation.

In the refrigeration apparatus (10), the heat source unit (11) includes a compressor (41, 42) and a heat source side heat exchanger (32), and one end of the heat source side heat exchanger (32). Is a compressor (41,4
One end of the liquid pipe (21) of the first system (1) is connected to the heat source side heat exchanger (32) while being connected so as to be switched between the discharge side and the suction side of 2). One end of 22) is connected to switch between the discharge side and the suction side of the compressor (41, 42), and one end of the liquid pipe (23) of the second system (2) is connected to the heat source side heat exchanger ( 32), and one end of the gas pipe (24) may be connected to the suction side of the compressor (41, 42).

Further, the refrigeration system (10) includes a first system (1)
And liquid piping (21,23) and gas piping (2
On / off valves (35, 36, 37, 38) may be provided at the ends of the heat source unit (11) in (2, 24).

That is, in the first solution, the heat source unit (11) supplies cold or warm heat to the first system (1) via the first system (47). Heat source unit (11)
Cooling heat is supplied to the second system (2) via the second system section (48).

Further, in the second solution, the first solution
The refrigerant discharged from the compressor (41, 42) flows into the heat source side heat exchanger (32) and condenses,
It flows on the liquid side of (1) and the second system (2), and the first system (1) and the second system (2) perform an endothermic operation and evaporate.
The evaporated refrigerant is supplied to the first system (1) and the second system (2)
And is sucked into the compressors (41, 42). When the operation of the heat source unit (11) switches, the compressor (41, 4
The refrigerant discharged from 2) flows on the gas side of the first system (1), performs a heat dissipation operation in the first system (1), and condenses. The condensed refrigerant flows on the liquid side of the first system (1),
It flows on the liquid side of the second system (2), performs an endothermic operation in the second system (2), and evaporates. The evaporated refrigerant flows on the gas side of the second system (2) and is sucked into the compressors (41, 42).

[0017] In a fourth solution, the heat source unit for a refrigerating apparatus (11) supplies cold or warm heat to the first system (1), and performs a heat absorption operation or a heat radiation operation in the first system (1). . The heat source unit for refrigeration equipment (11) is the second system (2)
And the second system (2) performs an endothermic operation.

[0018]

Therefore, according to the above solution, the first system (47) and the second system (48) are provided, so that the first system (1) and the second system (2) are provided. As a result, it is possible to connect an existing use unit, and the versatility can be improved.

Further, according to the second solving means, the first
Cold heat obtained in the system (1) can be supplied to the second system (2), and waste heat can be used effectively.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. The refrigeration apparatus (10) according to the present embodiment is provided in a convenience store, a supermarket, or the like, and performs cooling of a refrigerator or a freezer and cooling and heating of a room.

As shown in FIGS. 1 and 2, the refrigeration system (10) according to the present embodiment is provided with an outdoor unit (11), which is a heat source unit for the refrigeration system, which is extended from the outdoor unit (11) to endothermic operation. A first system (1) for performing heat dissipation operation, and a second system for extending only from the outdoor unit (11) and performing only heat absorption operation.
It is configured by connecting to the system (2). 1st system (1)
Are the first indoor unit (12) and the first liquid-side connecting pipe (2) connecting the outdoor unit (11) to the first indoor unit (12).
1) and a first gas side communication pipe (22). Second
The system (2) includes a second indoor unit (13), a refrigeration unit (14), and a cascade unit (15).
The second system (2) includes a second liquid-side communication pipe (23) and a second gas-side communication pipe (24) for connecting these units (13, 14, 15) to the outdoor unit (11). ing. The refrigeration unit (16) is connected to the second system (2) via a third liquid-side communication pipe (26) and a third gas-side communication pipe (27).

The refrigeration system (10) includes a high-temperature side refrigerant circuit (20) in which a high-temperature side refrigerant circulates and a low-temperature side refrigerant circuit (25) in which a low-temperature side refrigerant circulates. Is configured to do so.

The first indoor unit (12) is configured to switch between cooling and heating. The first indoor unit (12) is installed at, for example, a sales floor. The second indoor unit (13) is configured to perform only cooling. The second indoor unit (13) is installed in a room having a heat load such as a kitchen, for example, and performs cooling throughout the year. The refrigeration unit (14) is installed in a refrigerator and cools air in the refrigerator. The freezing unit (16) is installed in a freezer and cools air in the freezer. The refrigeration unit (14) may be provided in a refrigeration showcase, and the refrigeration unit (16) may be provided in a refrigeration showcase.

<< Structure of Outdoor Unit >> The outdoor unit (11) includes an outdoor circuit (30). Outdoor circuit (3
0) is a compressor unit (40) and a four-way switching valve (31)
An outdoor heat exchanger (32), an outdoor expansion valve (34), a receiver (33), a first liquid-side closing valve (35) that is an on-off valve,
A second liquid-side closing valve (37) as an on-off valve, a first gas-side closing valve (36) as an on-off valve, and a second gas-side closing valve (38) as an on-off valve are provided. 1st liquid side shut-off valve (35), 1st
Gas side shut-off valve (36), second liquid side shut-off valve (37) and second
The gas side stop valve (38) is configured to be connectable to a refrigerant pipe. The outdoor circuit (30) is provided with a gas vent pipe (64), a pressure equalizing pipe (66), and a liquid supply pipe (68).

The compressor unit (40) comprises a first compressor (41) and a second compressor (42) connected in parallel. Each of the first and second compressors (41, 42) is a closed type, high pressure dome type scroll compressor. That is, these compressors (41, 42) are configured by housing a compression mechanism and an electric motor that drives the compression mechanism in a cylindrical housing. The illustration of the compression mechanism and the electric motor is omitted. The first compressor (41) has a variable capacity in which the number of revolutions of the electric motor is changed stepwise or continuously. The second compressor (4
2) is of a constant capacity in which the motor is always driven at a constant rotation speed. And the said compressor unit (40)
By changing the capacity of the first compressor (41) or starting and stopping the second compressor (42), the capacity of the entire unit is variable.

The compressor unit (40) is provided with a suction pipe (4
3) and a discharge pipe (44). The suction pipe (43)
The inlet end is connected to the first port of the four-way switching valve (31), and the outlet end is branched into two, and each of the compressors (41, 42)
Is connected to the suction side. The discharge pipe (44) has an inlet end branched into two and connected to the discharge side of each compressor (41, 42), and an outlet end connected to the second port of the four-way switching valve (31). Have been. Further, a discharge-side check valve (45) is provided in a branch pipe of the discharge pipe (44) connected to the second compressor (42). The discharge-side check valve (45) allows only the flow of the refrigerant in the direction flowing out of the second compressor (42).

The compressor unit (40) includes an oil separator (51), an oil return pipe (52), and an oil equalizing pipe (54). The oil separator (51) is provided in the middle of the discharge pipe (44). This oil separator (51) is a compressor (41,42)
To separate the refrigerating machine oil from the discharged refrigerant.
The oil return pipe (52) has one end connected to the oil separator (51) and the other end connected to the suction pipe (43). The oil return pipe (52) is for returning the refrigerating machine oil separated by the oil separator (51) to the suction side of the compressors (41, 42), and includes an oil return solenoid valve (53). ing. Equalizing oil pipe (54)
Has one end connected to the second compressor (42) and the other end connected to the suction pipe (43) near the suction side of the first compressor (41). This oil equalizing pipe (54) is connected to each compressor (4
This is for averaging the amount of refrigerating machine oil stored in the housing of (1), (42), and includes an oil equalizing solenoid valve (55).

The four-way switching valve (31) has a third port connected to the first gas-side shutoff valve (36) by a pipe, and a fourth port.
Port is connected to the upper end of the outdoor heat exchanger (32) by piping. The four-way switching valve (31) has a state in which the first port and the third port are in communication and the second port and the fourth port are in communication (a state indicated by a solid line in FIG. 1); And the fourth port communicates with each other, and the second and third ports communicate with each other (the state shown by the broken line in FIG. 1). That is, one end of the outdoor heat exchanger (32) is connected to the compressor (4
1, 42) are connected so as to be switched to the discharge side or the suction side. First gas side shut-off valve (36) and compressor (41,42)
The first system part (47) is configured so as to be switchable between the discharge side and the suction side. A gas-side end of the first system (47) is provided with a first gas-side shut-off valve (36) so that the first system (1) can be connected thereto.

The outdoor heat exchanger (32) is composed of a cross-fin type fin-and-tube heat exchanger. In the outdoor heat exchanger (32), the high-temperature side refrigerant circulating in the high-temperature side refrigerant circuit (20) exchanges heat with the outdoor air.

The receiver (33) is a cylindrical container for storing a refrigerant. The receiver (33) is connected to the outdoor heat exchanger (32) via the inflow pipe (60), and the first liquid side closing valve (35) via the outflow pipe (62).
Is connected to The first liquid side closing valve (35) and the outdoor heat exchanger (32) are connected to form a first system part (47). The liquid-side end of the first system (47) is provided with a first liquid-side closing valve (35) so that the first system (1) can be connected thereto.

The inlet end of the inflow pipe (60) is branched into two branch pipes (60a, 60b), and the outlet end is connected to the upper end of the receiver (33). The first branch pipe (60a) of the inflow pipe (60) is connected to the lower end of the outdoor heat exchanger (32). The first branch pipe (60a) is provided with a first inflow check valve (61a). First inflow check valve (61
a) allows only the flow of refrigerant from the outdoor heat exchanger (32) to the receiver (33). The second branch pipe (60b) of the inflow pipe (60) is connected to the first liquid side closing valve (35). This second branch pipe (60b) has a second inflow check valve (61
b) is provided. The second inflow check valve (61b)
Only the flow of the refrigerant from the liquid side closing valve (35) to the receiver (33) is allowed.

The outlet pipe (62) has an inlet end connected to the lower end of the receiver (33), and an outlet end side branched into two branch pipes (62a, 62b). The first branch pipe (62a) of the outflow pipe (62) is connected to the lower end of the outdoor heat exchanger (32). The first branch pipe (62a) is provided with the outdoor expansion valve (34). The second branch pipe (62b) of the outflow pipe (62) is connected to the first liquid side closing valve (35). The second branch pipe (62b) is provided with an outflow check valve (63). Outflow check valve (63), receiver (33)
Only the flow of the refrigerant from to the first liquid side closing valve (35) is allowed.

The second liquid-side stop valve (37) is connected to the outflow pipe (6).
The pipe is connected between the outflow check valve (63) and the receiver (33) in the second branch pipe (62b) of 2). The second liquid side closing valve (37) and the outdoor heat exchanger (32) are connected to form a second system part (48). The liquid-side end of the second system (48) is provided with a second liquid-side shut-off valve (37) so that the second system (2) can be connected. On the other hand, the second gas side stop valve (38) is connected to a suction pipe (43) of the compressor unit (40) by piping. The second gas side shut-off valve (38) and the suction side of the compressors (41, 42) are connected to form a second system part (48). A gas-side end of the second system (48) is provided with a second gas-side shut-off valve (38) so that the second system (2) can be connected thereto.

The degassing pipe (64) has one end connected to the upper end of the receiver (33) and the other end connected to the suction pipe (4).
3) Connected to. The gas vent pipe (64) is provided with a gas vent solenoid valve (65). When the gas release solenoid valve (65) is opened and closed, the flow of the refrigerant in the gas release pipe (64) is interrupted.

One end of the pressure equalizing pipe (66) is connected to the degassing solenoid valve (65) of the degassing pipe (64) and the receiver (3).
The other end is connected to the discharge pipe (44). Further, the equalizing pipe (66) has a check valve (67) for equalizing that allows only the flow of the refrigerant from one end to the other end.
Is provided.

<< Configuration of First System >> The first indoor unit (12) of the first system (1) includes a first indoor circuit (80). The first indoor circuit (80) includes a first indoor heat exchanger (81) and a first indoor expansion valve (82) connected in series by piping. The first indoor expansion valve (82) is connected to a lower end of the first indoor heat exchanger (81). The first indoor circuit (8
The end on the first indoor expansion valve (82) side of (0) is connected to the first liquid side closing valve (35) of the outdoor circuit (30) via the first liquid side communication pipe (21). . That is, the first liquid side communication pipe (2
One end of 1) is connected to one end of the outdoor heat exchanger (32) via the first liquid side closing valve (35), the inflow pipe (60), and the outflow pipe (62). The end of the first indoor circuit (80) on the side of the first indoor heat exchanger (81) is connected to the first gas side shut-off valve (36) of the outdoor circuit (30) through the first gas side communication pipe (22). ) And connected. That is, one end of the first gas side communication pipe (22) is
The compressor (41,4) is connected via a first gas side shut-off valve (36), a four-way switching valve (31), and a discharge pipe (44) or a suction pipe (43).
It is connected to switch to the discharge side or the suction side of 2).

<< Configuration of Second System >> In the second system (2), the second indoor unit (13) and the refrigeration unit (1
4) and the cascade unit (15) are connected in parallel to the outdoor unit (11) via the second liquid-side communication pipe (23) and the second gas-side communication pipe (24).

The second indoor unit (13) includes a second indoor circuit (90). This second indoor circuit (90)
The second indoor heat exchanger (91) and the second indoor expansion valve (92) are connected in series by piping. Second indoor expansion valve (92)
Is connected to the lower end of the second indoor heat exchanger (91).

The refrigeration unit (14) includes a refrigeration circuit (10
0). This refrigeration circuit (100) is configured by connecting a refrigeration heat exchanger (101) and a refrigeration expansion valve (102) in series by piping. The refrigerating expansion valve (102) is connected to the upper end of the refrigerating heat exchanger (101).

The cascade unit (15) includes a high-temperature side cascade circuit (110). This high-temperature side cascade circuit (110) has a cascade heat exchanger (111) and a cascade expansion valve (112) connected in series by piping. The cascade expansion valve (112) is connected to an upper end on the primary side of the cascade heat exchanger (111).

One end of the second liquid side communication pipe (23) is connected to the second liquid side closing valve (37). That is, the second
One end of the liquid side communication pipe (23) is connected to one end of the outdoor heat exchanger (32) via the second liquid side closing valve (37), the inflow pipe (60), and the outflow pipe (62). I have. The second liquid-side communication pipe (23) is branched into three at the other end, and is connected to the end of the second indoor circuit (90) on the side of the second indoor expansion valve (92) and the refrigeration circuit (100). ), The end on the refrigeration expansion valve (102) side;
It is connected to the end on the cascade expansion valve (112) side of the high temperature side cascade circuit (110).

One end of the second gas side communication pipe (24) is connected to the second gas side closing valve (38). That is,
One end of the second gas side communication pipe (24) is compressed via a second gas side shutoff valve (38), a four-way switching valve (31), and a discharge pipe (44) or a suction pipe (43). It is connected to switch to the discharge side or the suction side of the machines (41, 42). The second gas-side communication pipe (24) is branched into three at the other end, and
The end of the indoor circuit (90) on the side of the second indoor heat exchanger (91) and the refrigeration heat exchanger (101) in the refrigeration circuit (100)
And an end on the cascade heat exchanger (111) side of the high temperature side cascade circuit (110).

The outdoor circuit (30) and the first indoor circuit (8
0), a second indoor circuit (90), a refrigeration circuit (100), a high-temperature cascade circuit (110), and a first liquid-side communication pipe (21).
And the first gas side communication pipe (22) and the second liquid side communication pipe (23)
And the second gas side communication pipe (24) are connected to the high temperature side refrigerant circuit (2
0).

The first indoor heat exchanger (81), the second indoor heat exchanger (91) and the refrigeration heat exchanger (101) are constituted by a cross-fin type fin-and-tube heat exchanger. ing. In the first indoor heat exchanger (81) and the second indoor heat exchanger (91), the high-temperature side refrigerant circulating in the high-temperature side refrigerant circuit (20) exchanges heat with room air. Refrigeration heat exchanger (10
In 1), the high-temperature side refrigerant circulating in the high-temperature side refrigerant circuit (20) exchanges heat with the air in the refrigerator.

<< Configuration of Low-Temperature Refrigerant Circuit >> The cascade unit (15) includes a low-temperature cascade circuit (120). The low temperature side cascade circuit (120) includes a secondary side of the cascade heat exchanger (111), a low temperature side compressor (121),
A receiver (123), a third liquid-side stop valve (124), and a third gas-side stop valve (125) are provided. 1 and 2, "A" in FIG. 2 corresponds to "A" in FIG. 1, and "B" in FIG. 2 corresponds to "B" in FIG.

The discharge side of the low-temperature side compressor (121) is connected to a cascade heat exchanger (11) through a discharge side check valve (122).
The pipe is connected to the upper end of the secondary side in 1). The discharge side check valve (122) allows only the flow of the refrigerant from the low temperature side compressor (121) to the cascade heat exchanger (111). On the other hand, the suction side of the low temperature side compressor (121) is connected to the third gas side closing valve (125) by piping. The lower end of the secondary side of the cascade heat exchanger (111) is connected to the upper part of the receiver (123) by piping. The bottom of the receiver (123) is connected to the third liquid-side stop valve (124) by piping.

The refrigeration unit (16) includes a refrigeration circuit (13)
0). The refrigeration circuit (130) is configured by connecting a refrigeration heat exchanger (131) and a refrigeration expansion valve (132) in series with a pipe. The refrigeration expansion valve (132) is connected to the upper end of the refrigeration heat exchanger (131). Refrigeration circuit (13
0), the end on the side of the refrigeration expansion valve (132) is connected to the third low-temperature cascade circuit (120) through the third liquid-side communication pipe (26).
It is connected to the liquid side closing valve (124). On the other hand, the end of the refrigeration circuit (130) on the refrigeration heat exchanger (131) side is connected to the low-temperature cascade circuit (12) through a third gas-side communication pipe (27).
0) is connected to the third gas side shut-off valve (125).

The low temperature side refrigerant circuit (25) includes a low temperature side cascade circuit (120), a refrigeration circuit (130), a third liquid side communication pipe (26), and a third gas side communication pipe (27). It consists of.

The cascade heat exchanger (111) is constituted by a plate heat exchanger. The cascade heat exchanger (111) has a primary flow path and a secondary flow path defined therein. As described above, the cascade heat exchanger (111) has a primary side connected to the high-temperature side refrigerant circuit (20) and a secondary side connected to the low-temperature side refrigerant circuit (25). The cascade heat exchanger (111) is for exchanging heat between the high-temperature side refrigerant flowing through its primary side and the low-temperature side refrigerant flowing through its secondary side. That is, the cascade heat exchanger (111) functions as a cascade condenser in the binary refrigeration cycle.

<< Other Configuration >> The outdoor unit (11)
Is provided with an outdoor fan (70) and an outside air temperature sensor (71). The outdoor fan (70) is an outdoor heat exchanger (32)
It is for sending outdoor air to Outside temperature sensor (7
1) is for detecting the temperature of the outdoor air sent to the outdoor heat exchanger (32).

The outdoor circuit (30) housed in the outdoor unit (11) is provided with various sensors. Specifically, the outdoor heat exchanger (32) is provided with an outdoor heat exchanger temperature sensor (72) for detecting the heat transfer tube temperature. The suction pipe (43) has a suction pipe temperature sensor (73) for detecting the suction refrigerant temperature of the compressor (41, 42) and a low pressure for detecting the suction refrigerant pressure of the compressor (41, 42). A pressure sensor (74) is provided. In the discharge pipe (44),
A discharge pipe temperature sensor (75) for detecting the discharge refrigerant temperature of the compressor (41, 42), a high pressure sensor (76) for detecting the discharge refrigerant pressure of the compressor (41, 42), and a high pressure A pressure switch (77) is provided. Degassing pipe (64)
Is provided with a vent tube temperature sensor (78) for detecting the temperature of the refrigerant after passing through the vent gas solenoid valve (65).

The first indoor unit (12) is provided with a first indoor fan (83) and a first internal temperature sensor (84). The first indoor fan (83) is for sending indoor air to the first indoor heat exchanger (81). The first inside air temperature sensor (84) is for detecting the temperature of room air sent to the first indoor heat exchanger (81).

The first indoor circuit (80) housed in the first indoor unit (12) is provided with a temperature sensor. Specifically, the first indoor heat exchanger (81) is provided with a first indoor heat exchanger temperature sensor (85) for detecting the heat transfer tube temperature. Near the upper end of the first indoor heat exchanger (81) in the first indoor circuit (80), a first gas side temperature sensor (86) for detecting the temperature of the gas refrigerant flowing through the first indoor circuit (80) is provided. Is provided.

The second indoor unit (13) is provided with a second indoor fan (93) and a second internal temperature sensor (94). The second indoor fan (93) is for sending indoor air to the second indoor heat exchanger (91). The second inside air temperature sensor (94) is for detecting the temperature of room air sent to the second indoor heat exchanger (91).

The second indoor circuit (90) housed in the second indoor unit (13) is provided with a temperature sensor. Specifically, the second indoor heat exchanger (91) is provided with a second indoor heat exchanger temperature sensor (95) for detecting the heat transfer tube temperature. Near the upper end of the second indoor heat exchanger (91) in the second indoor circuit (90), a second gas side temperature sensor (96) for detecting the temperature of the gas refrigerant flowing through the second indoor circuit (90). Is provided.

The refrigerating unit (14) is provided with a refrigerating fan (103) and a refrigerating temperature sensor (104). The refrigeration fan (103) is for sending air in the refrigerator to the refrigeration heat exchanger (101). The refrigeration temperature sensor (104) is for detecting the temperature of the inside air sent to the refrigeration heat exchanger (101).

The refrigeration circuit (100) housed in the refrigeration unit (14) is provided with a temperature sensor. Specifically, the refrigerating heat exchanger (101) is provided with a refrigerating heat exchanger temperature sensor (105) for detecting the heat transfer tube temperature. A refrigeration gas side temperature sensor (106) for detecting the temperature of the gas refrigerant flowing through the refrigeration circuit (100) is provided near the lower end of the refrigeration heat exchanger (101) in the refrigeration circuit (100).

The cascade circuit (110) housed in the cascade unit (15) is provided with a cascade outlet temperature sensor (113). The cascade outlet temperature sensor (113) is connected to the cascade heat exchanger (1).
This is for detecting the temperature of the high-temperature side refrigerant flowing out from the primary side in 11).

The refrigeration unit (16) is provided with a refrigeration fan (133) and a refrigeration temperature sensor (134). The freezing fan (133) is for sending air in the freezer to the freezing heat exchanger (131). The refrigeration temperature sensor (134) is for detecting the temperature of the air in the refrigerator sent to the refrigeration heat exchanger (131).

The refrigeration circuit (130) housed in the refrigeration unit (16) is provided with a temperature sensor. Specifically, the refrigeration heat exchanger (131) is provided with a refrigeration heat exchanger temperature sensor (135) for detecting the heat transfer tube temperature. A refrigeration gas side temperature sensor (136) for detecting the temperature of the gas refrigerant flowing through the refrigeration circuit (130) is provided near the lower end of the refrigeration heat exchanger (131) in the refrigeration circuit (130).

The outdoor unit (11) includes a controller (200). The controller (200) controls the operation of the refrigeration system (10) in response to a signal from the sensors or a command signal from a remote controller or the like. Specifically, the controller (200) controls the opening degree of the outdoor expansion valve (34), switches the four-way switching valve (31), and controls the degassing solenoid valve (6
5) Open / close the oil return solenoid valve (53) and oil equalization solenoid valve (55). Further, the controller (200) controls the capacity of the compressor unit (40).

-Operating operation- The refrigeration apparatus (10) performs a cooling operation for cooling the indoor air of the first indoor unit (12) in the first system (1) and a cooling operation for cooling the indoor air of the first indoor unit (12). The operation is performed by switching between heating operation and heating operation. In the second system (2),
Only the heat absorbing operation for cooling the room air and the room air is performed.
During the operation of the refrigeration system (10), the refrigerant circulates in each of the high-temperature side refrigerant circuit (20) and the low-temperature side refrigerant circuit (25) while changing phases, and a vapor compression refrigeration cycle is performed.

<< Cooling Operation >> In the cooling operation, in the high-temperature side refrigerant circuit (20), the outdoor heat exchanger (32) is used as a condenser, and the first indoor heat exchanger (81) and the second indoor heat exchanger ( 9
1), a refrigeration cycle is performed using the refrigerating heat exchanger (101) and the cascade heat exchanger (111) as evaporators. On the other hand, in the low-temperature side refrigerant circuit (25), a refrigeration cycle is performed using the cascade heat exchanger (111) as a condenser and the refrigeration heat exchanger (131) as an evaporator.

During the cooling operation, the four-way switching valve (31) is switched to the state shown by the solid line in FIG. Further, the first indoor expansion valve (82), the second indoor expansion valve (92), the refrigeration expansion valve (102), the cascade expansion valve (112), and the refrigeration expansion valve (132) have a predetermined opening degree. The outdoor expansion valve (34) is fully closed. Oil return solenoid valve (53), oil equalizing solenoid valve (55),
The degassing solenoid valve (65) and the liquid supply solenoid valve (69) are normally kept closed, but are opened and closed as needed.

First, the operation of the high-temperature side refrigerant circuit (20) will be described. Compressor (41,42) of compressor unit (40)
Is operated, the high-temperature side refrigerant compressed by the compressors (41, 42) is discharged to the discharge pipe (44). The high-temperature side refrigerant flows into the outdoor heat exchanger (32) through the four-way switching valve (31). In the outdoor heat exchanger (32), the high-temperature side refrigerant releases heat to outdoor air and condenses. The high-temperature side refrigerant condensed in the outdoor heat exchanger (32) flows into the first branch pipe (60a) of the inflow pipe (60), passes through the first inflow check valve (61a), and passes through the receiver (3).
3). The high-temperature side refrigerant of the receiver (33) flows into the outflow pipe (62). Thereafter, the high-temperature side refrigerant is divided into two flows, one of which flows through the outflow check valve (63) to the first liquid side closing valve (35), and the other flows to the second liquid side closing valve (37).

The high-temperature side refrigerant that has passed through the first liquid side closing valve (35) flows through the first system (1). That is, the high temperature side refrigerant passes through the first liquid side communication pipe (21) and passes through the first indoor circuit (8).
0). In the first indoor circuit (80), after the inflowing high-temperature side refrigerant is decompressed by the first indoor expansion valve (82),
It flows into the indoor heat exchanger (81). The first indoor heat exchanger (8
In 1), the high temperature side refrigerant absorbs heat from room air and evaporates. That is, in the first indoor heat exchanger (81), the indoor air is cooled. The high-temperature side refrigerant evaporated in the first indoor heat exchanger (81) flows through the first gas side communication pipe (22), returns to the outdoor unit (11), and passes through the first gas side shutoff valve (36). Flow into the outdoor circuit (30). Thereafter, the high-temperature side refrigerant passes through the four-way switching valve (31) and flows into the suction pipe (43).

On the other hand, the high temperature side refrigerant that has passed through the second liquid side closing valve (37) flows through the second system (2). That is, the high-temperature side refrigerant flows into the second liquid-side communication pipe (23), and is then divided into three, and the second indoor circuit (90) and the refrigeration circuit (10).
0) or flows to the high temperature side cascade circuit (110).

The high-temperature side refrigerant flowing into the second indoor circuit (90) flows into the second indoor heat exchanger (91) after being decompressed by the second indoor expansion valve (92). In the second indoor heat exchanger (91), the high-temperature side refrigerant absorbs heat from room air and evaporates. That is, in the second indoor heat exchanger (91), the indoor air is cooled.

The high-temperature side refrigerant that has flowed into the refrigeration circuit (100) flows into the refrigeration heat exchanger (101) after being depressurized by the refrigeration expansion valve (102). In the refrigeration heat exchanger (101),
The high temperature side refrigerant absorbs heat from the air inside the refrigerator and evaporates.
That is, in the refrigerating heat exchanger (101), the air in the refrigerator is cooled.

The high-temperature side refrigerant flowing into the high-temperature side cascade circuit (110) is depressurized by the cascade expansion valve (112) and then flows into the cascade heat exchanger (111). In the cascade heat exchanger (111), the high-temperature side refrigerant flowing on the primary side absorbs heat from the low-temperature side refrigerant flowing on the secondary side and evaporates.

The second indoor heat exchanger (91), the refrigeration circuit (10
0) or the high-temperature-side refrigerant evaporated in the cascade heat exchanger (111) flows into the second gas-side connecting pipe (24), merges, and returns to the outdoor unit (11). And the second
The gas flows into the suction pipe (43) through the gas-side stop valve (38). In the suction pipe (43), the high-temperature side refrigerant flowing through the first system (1) and the high-temperature side refrigerant flowing through the second system (2) merge. The high-temperature side refrigerant flowing through the suction pipe (43) is sucked into the compressors (41, 42) of the compressor unit (40). These compressors (41, 42) compress the sucked high-temperature side refrigerant and discharge it again. In the high-temperature side refrigerant circuit (20), such circulation of the high-temperature side refrigerant is repeated.

Next, the operation of the low-temperature side refrigerant circuit (25) will be described. When the low temperature side compressor (121) is operated, the compressed low temperature side refrigerant is discharged from the low temperature side compressor (121). The low-temperature-side refrigerant passes through the discharge-side check valve (122) and flows into the secondary side of the cascade heat exchanger (111). In the cascade heat exchanger (111), the low-temperature side refrigerant on the secondary side radiates heat to the high-temperature side refrigerant on the primary side and condenses. The low-temperature side refrigerant condensed in the cascade heat exchanger (111) flows into the receiver (123). Thereafter, the low-temperature side refrigerant flows out of the receiver (123), passes through the third liquid side communication pipe (26), and flows through the refrigeration circuit (13).
0).

In the refrigeration circuit (130), the inflowing low-temperature side refrigerant is reduced in pressure by the refrigeration expansion valve (132), and then flows into the refrigeration heat exchanger (131). In the refrigeration heat exchanger (131),
The low-temperature refrigerant absorbs heat from the air in the freezer and evaporates.
That is, in the freezing heat exchanger (131), the air in the freezer is cooled. The low-temperature side refrigerant evaporated in the refrigeration heat exchanger (131) flows into the low-temperature side cascade circuit (120) through the third gas-side communication pipe (27). Thereafter, the low-temperature side refrigerant is sucked into the low-temperature side compressor (121). The low temperature side compressor (121) compresses the sucked low temperature side refrigerant and discharges it again. In the low-temperature side refrigerant circuit (25), such circulation of the low-temperature side refrigerant is repeated.

<< Heating Operation >> In the heating operation, in the high-temperature side refrigerant circuit (20), the first indoor heat exchanger (81) is used as a condenser, and the outdoor heat exchanger (32) and the second indoor heat exchanger ( 91),
Refrigerator heat exchanger (101) and cascade heat exchanger (11
A refrigeration cycle is performed using 1) as an evaporator. On the other hand, in the low-temperature side refrigerant circuit (25), the cascade heat exchanger (111)
Is used as a condenser, and the refrigeration cycle is performed using the refrigeration heat exchanger (131) as an evaporator. The operation of the low-temperature side refrigerant circuit (25) is the same as in the cooling operation.

During the heating operation, the four-way switching valve (31) is switched to the state shown by the broken line in FIG. The first indoor expansion valve (82), the second indoor expansion valve (92), the refrigeration expansion valve (102), the cascade expansion valve (112), and the refrigeration expansion valve (13)
2) and the outdoor expansion valve (34) is set to a predetermined opening. The oil return solenoid valve (53), oil equalizing solenoid valve (55), degassing solenoid valve (65), and liquid supply solenoid valve (69) are normally kept closed. It is opened and closed appropriately.

The compressor (41, 42) of the compressor unit (40)
When the compressor is operated, the compressed high-temperature refrigerant flows into the compressor (41, 4
From 2), it is discharged to the discharge pipe (44). The discharged high-temperature side refrigerant passes through the four-way switching valve (31) and flows through the first system (1). That is, the discharged high-temperature side refrigerant flows into the first indoor circuit (80) through the first gas side communication pipe (22).
The high-temperature side refrigerant that has flowed into the first indoor circuit (80) releases heat to indoor air in the first indoor heat exchanger (81) and condenses. In the first indoor heat exchanger (81), the indoor air is heated by heat radiation of the high-temperature side refrigerant.

The high-temperature side refrigerant condensed in the first indoor heat exchanger (81) passes through the first indoor expansion valve (82), flows through the first liquid side communication pipe (21), and flows to the outdoor unit (11). Return. The high-temperature-side refrigerant returned to the outdoor unit (11) is supplied to the first liquid-side stop valve (3
5), and flows into the second branch pipe (60b) of the inflow pipe (60). The high-temperature side refrigerant passes through the second inflow check valve (61b) and flows into the receiver (33). The high-temperature side refrigerant of the receiver (33) flows from the receiver (33) into the outflow pipe (62). Thereafter, the high-temperature side refrigerant is divided into two parts, one of which flows into the first branch pipe (62a) of the outflow pipe (62), and the other flows into the second branch pipe (62b) of the outflow pipe (62).

The high-temperature side refrigerant flowing into the first branch pipe (62a) of the outflow pipe (62) flows into the outdoor heat exchanger (32) after being depressurized by the outdoor expansion valve (34). In the outdoor heat exchanger (32), the high-temperature side refrigerant absorbs heat from outdoor air and evaporates. The evaporated high-temperature side refrigerant flows into the suction pipe (43) through the four-way switching valve (31).

On the other hand, the second branch pipe (62b) of the outflow pipe (62)
The high-temperature side refrigerant that has flown into the second system flows through the second system in the same manner as in the cooling operation. In other words, the high-temperature side refrigerant flows out of the receiver (33), flows through the second liquid-side communication pipe (23), is diverted and divided into the second indoor circuit (90), the refrigeration circuit (100), or the high-temperature cascade circuit ( Sent to 110). The high-temperature side refrigerant that has flowed into the second indoor circuit (90) absorbs heat from indoor air in the second indoor heat exchanger (91) and evaporates. The high-temperature side refrigerant flowing into the refrigeration circuit (100) absorbs heat from the air in the refrigerator in the refrigeration heat exchanger (101) and evaporates. The high-temperature side refrigerant that has flowed into the high-temperature side cascade circuit (110) absorbs heat from the internal air in the cascade heat exchanger (111) and evaporates. The second indoor heat exchanger (9
1), the high-temperature side refrigerant evaporated in the refrigeration heat exchanger (101) or the cascade heat exchanger (111) is supplied to the second gas side communication pipe (2).
Merges in 4) and returns to the outdoor unit (11).
The gas flows into the suction pipe (43) through the gas-side stop valve (38).

In the suction pipe (43), the high-temperature side refrigerant evaporated in the outdoor heat exchanger (32) and the second indoor heat exchanger (91), the refrigeration heat exchanger (101), or the cascade heat exchanger ( The high-temperature side refrigerant evaporated in 111) merges. The joined high-temperature side refrigerant is sucked into the compressors (41, 42) of the compressor unit (40). These compressors (41, 42) compress the sucked high-temperature side refrigerant and discharge it again. In the high temperature side refrigerant circuit (20),
Such circulation of the high-temperature side refrigerant is repeated.

As described above, during the heating operation, not only the heat absorbed by the high-temperature side refrigerant from the outdoor air in the outdoor heat exchanger (32) but also the second indoor heat exchanger (91) and the refrigeration heat exchanger (10).
1) Alternatively, the indoor air is heated by the first indoor heat exchanger (81) by utilizing the heat absorbed by the high-temperature side refrigerant from the indoor air or the indoor air in the cascade heat exchanger (111).

In the heating operation, the outdoor heat exchanger (32), the second indoor heat exchanger (91), and the refrigeration heat exchanger (10) are used.
1) and the amount of heat absorbed by the high-temperature refrigerant in the cascade heat exchanger (111) may exceed the amount of heat released by the high-temperature refrigerant in the first indoor heat exchanger (81). In such a case, the outdoor expansion valve (34) is fully closed, and the flow of the high-temperature side refrigerant toward the outdoor heat exchanger (32) is shut off. That is, the second indoor heat exchanger (91), the refrigerating heat exchanger (101), and the cascade heat exchanger (111) are used as evaporators to reduce the amount of heat absorbed by the high-temperature side refrigerant.

According to the present embodiment, the first system (1) and the second system (2) are separately connected to the outdoor unit (11). The 1) and the second system (2) can use an existing utilization unit, and can improve the versatility as the refrigeration system (10).

Further, since the cold heat obtained in the first system (1) is supplied to the second system (2), waste heat can be effectively used.

<Other Embodiments of the Invention>
In the above embodiment, the configuration may be such that the cascade unit (15) and the refrigeration unit (16) are omitted and only the high-temperature side refrigerant circuit (20) is provided.

Further, the second indoor unit (13) may be omitted.

Further, a plurality of first indoor units (12), second indoor units (13), refrigeration units (14), and refrigeration units (16) may be provided.

[Brief description of the drawings]

FIG. 1 is a refrigerant system diagram showing a high-temperature side refrigerant circuit of a refrigeration apparatus according to an embodiment.

FIG. 2 is a refrigerant system diagram illustrating a low-temperature side refrigerant circuit of the refrigeration apparatus according to the embodiment.

[Explanation of symbols]

 (11) Outdoor unit (20) High-temperature side refrigerant circuit (21) First liquid side communication pipe (22) First gas side communication pipe (23) Second liquid side communication pipe (24) Second gas side communication pipe (32 ) Outdoor heat exchanger (35) First liquid side shutoff valve (36) First gas side shutoff valve (37) Second liquid side shutoff valve (38) Second gas side shutoff valve (41) First compressor (42) ) Second compressor (47) First system (48) Second system

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhide Nomura 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries, Ltd. Sakai Seisakusho Kanaoka factory F-term (reference) 3L092 AA14 BA06

Claims (5)

[Claims] 1. A first method for switching between an endothermic operation and a heat radiation operation.
A first system part (47) having an end configured to be connectable to the system (1), and a second system part having an end configured to be connectable to a second system (2) performing only the heat absorption operation (48) A heat source unit for a refrigeration system, comprising: 2. The compressor according to claim 1, further comprising a compressor (41, 42) and a heat source side heat exchanger (32), wherein one end of the heat source side heat exchanger (32) is connected to the compressor (41, 42). The liquid side of the first system part (47) is connected to the discharge side and the suction side so as to be switched, and the heat source side heat exchanger (32)
The gas side of the first system (47) is connected so that the discharge side and the suction side of the compressor (41, 42) are switched, and the liquid side of the second system (48) is A heat source unit for a refrigeration system, wherein the gas side of the second system part (48) is connected to the suction side of the compressors (41, 42). . 3. The liquid-side and gas-side ends of the first system part (47) and the liquid-side and gas-side ends of the second system part (48), respectively. A heat source unit for a refrigeration system, comprising a valve (35, 36, 37, 38). 4. A refrigeration unit heat source unit (11) according to any one of claims 1 to 3, and a first system connected to the refrigeration unit heat source unit (11) and switching between an endothermic operation and a heat dissipation operation. A refrigeration system comprising: (1) a second system (2) connected to the refrigeration system heat source unit (11) and performing only an endothermic operation. 5. The liquid system (1) according to claim 4, wherein the first system (1) includes a liquid pipe (21) and a gas pipe (22) extending from the refrigeration unit heat source unit (11) to the outside of the refrigeration unit heat source unit (11). The second system (2) includes a liquid extending from the refrigeration unit heat source unit (11) to the outside of the refrigeration unit heat source unit (11). A refrigeration apparatus comprising a pipe (23) and a gas pipe (24) and configured to perform only an endothermic operation.