JP3228157B2 - Refrigeration unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration unit used in a refrigeration circuit for injecting intermediate-pressure refrigerant into a compressor.

[0002]

2. Description of the Related Art A refrigeration cycle for injecting a medium-pressure gas refrigerant into a compressor has been known for the purpose of improving the capacity of a condenser.

[0003] For example, Japanese Patent Application Laid-Open No. 4-177062 discloses a refrigeration circuit as shown in FIG. In this refrigeration circuit, during heating, the refrigerant circulates in the direction indicated by the arrow in the figure. The refrigerant discharged from the compressor (a) is condensed in the indoor heat exchanger (c), which serves as a condenser, and is decompressed from a high pressure to an intermediate pressure by the decompressors (g1) and (g3). The gas refrigerant and the liquid refrigerant are separated in the vessel (d). The liquid refrigerant passes through the check valve (i2), is reduced in pressure from intermediate pressure to low pressure by the pressure reducer (g2), evaporates in the outdoor heat exchanger (e), and returns to the compressor (a). On the other hand, the gas refrigerant in the gas-liquid separator (d) is sucked into the compressor (a) through the outlet pipe (h). As a result, the circulation amount of the gas refrigerant flowing through the indoor heat exchanger (c) increases, and the heating capacity is improved.

[0004] In such an apparatus as described above, the gas-liquid separator (d) is usually incorporated in an outdoor unit together with the compressor (a) as shown in FIG.

In recent years, in consideration of global environmental problems such as depletion of the ozone layer, a transition from a conventional refrigerant such as R22 to an alternative refrigerant has been made. At present, a refrigerant called R410A is particularly attracting attention as an alternative refrigerant. R410A has a characteristic that the amount of change in latent heat due to a temperature change is larger than that of R22. Therefore, when the condensation temperature increases, it becomes difficult to secure a necessary enthalpy difference in the condenser. In that case,
There is a need to increase the amount of refrigerant circulating through the condenser. Therefore, it is considered that this problem can be solved by using an injection refrigeration cycle.

[0006]

However, as shown in FIGS. 10 and 11, in the conventional refrigeration system, the gas-liquid separator (d) is housed in a space (m) on the side in the outdoor casing. And the compressor (a) at a position remote from the accumulator (f). Note that this accumulator (f)
Is a gas-liquid separator that is integrally formed with the compressor (a) and separates the refrigerant sucked into the compressor (a) into gas and liquid. Also, gas-liquid separator
(d) is provided at a position distant from the center line (n) between the accumulator (f) and the compressor (a) to some extent. Also, usually
An electric expansion valve and a solenoid valve of the refrigeration circuit are housed in the outdoor unit, and electric wiring for connecting these devices and electrical components is also provided in the outdoor unit. Conventionally, the arrangement relationship between the compressor (a), the accumulator (f), and the gas-liquid separator (d) is determined mainly from the viewpoint of workability of piping and wiring at the time of manufacturing, etc. Since no consideration was given to the aspect of improvement and performance improvement, there were the following problems.

That is, it is necessary to secure an extra space for accommodating the gas-liquid separator (d) in the space (m) on the side in the outdoor casing, so that the entire outdoor unit is large. Therefore, the conventional arrangement structure has a problem when the outdoor unit is downsized.

On the other hand, an accumulator (f) and a gas-liquid separator
(d) has a certain weight, and when the liquid refrigerant is stored, the weight becomes even larger. However, in the conventional arrangement structure, since the accumulator (f) and the gas-liquid separator (d) are not installed symmetrically with respect to the compressor (a), the balance of the force applied to the compressor (a) is not balanced. It was bad. Therefore, the vibration of the compressor (a) was large.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and has as its object to reduce the size of a refrigeration system for injecting an intermediate-pressure refrigerant into a compressor, improve performance and reliability, and improve workability in handling. .

[0010]

In order to achieve the above object, the present invention relates to a method for installing a gas-liquid separator (6) on a compressor (1).
And the relationship with the accumulator (8).
The compressor (1), accumulator (8), and gas-liquid separator (6)
Are integrally wrapped with a sound insulating material (25) having heat insulating properties. Also, the electric wire (31) of the compressor (1), the electric expansion valve
The electric wires (32, 33) of (4, 5) and the electric wire (34) of the solenoid valve (9) were integrated.

More specifically, the means implemented by the first aspect of the present invention includes a compressor (1) of a refrigeration circuit (22) for injecting an intermediate-pressure gas refrigerant into the compressor (1); Circuit (2
A first gas-liquid separator (8) provided in the compressor (1) for gas-liquid separation of the suction refrigerant of the compressor (1), and an intermediate-pressure refrigerant of the refrigeration circuit (22) provided in the refrigeration circuit (22). And a second gas-liquid separator (6) for gas-liquid separation,
The first gas-liquid separator (8) is disposed adjacent to the compressor (1) on the side of the compressor (1), while the second gas-liquid separator (6) is resulting disposed in the gap portion, the compressor (1) and the first gas between the compressor (1) and the first gas-liquid separator (8)
The liquid separator (8) and the second gas-liquid separator (6) have heat insulation properties.
It is configured to be integrally wrapped by a soundproofing material (25) .

[0012] According to the above-mentioned features of the invention, there is no need to provide an extra space for providing the second gas-liquid separator (6) in the refrigeration unit, so that the refrigeration unit can be made compact.

According to the above-mentioned invention specifying matter, the compressor (1)
Efficiently heat the second gas-liquid separator (6) with generated heat
Can be. Therefore, the intermediate pressure cooling sucked into the compressor (1)
As the enthalpy of the medium rises, the high pressure discharged from the compressor (1)
The enthalpy of the pressurized gas increases. As a result, the condenser
Large enthalpy change of the refrigerant
This makes it possible to increase the condensation capacity.

Means taken by the invention according to claim 2 is that the compressor (1) of the refrigeration circuit (22) for injecting the intermediate-pressure gas refrigerant into the compressor (1) and the refrigeration circuit (22) A first gas-liquid separator provided for separating the suction refrigerant of the compressor (1) into gas and liquid;
(8), the refrigeration circuit (22) provided in the refrigeration circuit (22)
And a second gas-liquid separator (6) for gas-liquid separation of the intermediate-pressure refrigerant, wherein the first gas-liquid separator (8) is disposed beside the compressor (1). While
The second gas-liquid separator (6) is disposed on the side of the compressor (1) on the opposite side of the first gas-liquid separator (8), and the first gas-liquid separator (8) And the compressor (1) and the second gas-liquid separator (6)
Are sequentially arranged on a straight line.

According to the above-mentioned invention specific matter, since unbalanced load is not applied to the compressor (1), vibration of the compressor (1) is reduced.

According to a third aspect of the present invention, in the refrigeration unit according to the second aspect , the compressor (1), the first gas-liquid separator (8), and the second gas-liquid separator (6) are provided. ) Is a structure integrally wrapped by a sound insulating material (25) having heat insulating properties.

According to the above aspect of the invention, the second gas-liquid separator (6) can be efficiently heated by the heat generated in the compressor (1). Therefore, the enthalpy of the intermediate-pressure refrigerant sucked into the compressor (1) increases, and the enthalpy of the high-pressure gas discharged from the compressor (1) increases. As a result, a large enthalpy change amount of the refrigerant can be secured in the condenser, and the condensation capacity can be increased.

According to a fourth aspect of the present invention, there is provided a refrigeration unit according to the first or second aspect, wherein
(22) a first pressure reducing mechanism (4) for reducing the pressure of the high-pressure refrigerant to an intermediate pressure and supplying it to the second gas-liquid separator (6);
(6) The second method of reducing the intermediate pressure refrigerant flowing out from (6) to a low pressure
A pressure reducing mechanism (5) and a second gas-liquid separator (6)
And a solenoid valve (9) for opening and closing an injection passage (11) for supplying to the compressor (1) from at least one of the first pressure reducing mechanism (4) and the second pressure reducing mechanism (5). A compressor electric wire (31) for driving and controlling the compressor (1), and an electric expansion valve electric wire (32, 33) for driving and controlling the electric expansion valve (4, 5). And an electromagnetic valve wire (34) for driving and controlling the electromagnetic valve (9) are integrally formed to form an integrated electric wire (37) formed into one cable (37a).
Is provided.

According to the above-mentioned invention specifying matter, workability at the time of attaching or detaching wiring is improved, and the possibility of erroneous wiring is reduced. Therefore, the reliability of the refrigeration system can be improved.

According to a fifth aspect of the present invention, in the refrigeration unit according to the fourth aspect, the cable (37a)
At one end, the electrical component board (39) and the detachable socket (3
8) is configured.

According to the above-mentioned invention specifying matter, the integrated electric wire (37)
And the electric component board (39) can be easily attached and detached.

[0022]

Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

-Structure of Outdoor Unit (20)-As shown in FIG. 1, the refrigeration unit of the first embodiment is a unit mainly aimed at downsizing. This refrigeration unit is an outdoor unit (20) of a so-called room air conditioner. The outdoor unit (20) includes a plate fin tube heat exchanger (7) provided at the front and formed in a substantially L-shape, and a propeller fan (FIG. 1) disposed behind the plate fin tube heat exchanger (7). Not shown) and the compressor installed on the side
(1), an accumulator (8) as a first gas-liquid separator, a gas-liquid separator (6) as a second gas-liquid separator, an electric expansion valve described later
(4), (5) (not shown in FIG. 1) and a solenoid valve (9) (not shown in FIG. 1) are housed in a casing (15). In addition, for easy understanding, illustration of some devices and pipes that are not characteristic parts of the present invention is omitted.

The outdoor unit (20) is connected to the indoor unit (21) through a pipe to constitute an air conditioner (30) having a refrigerant circuit (22) as shown in FIG. Refrigerant circuit, which is a refrigeration circuit
(22) is a compressor (1), a four-way switching valve (2), an indoor heat exchanger
(3), a first electric expansion valve (4), a gas-liquid separator (6), a second electric expansion valve (5), an outdoor heat exchanger (7) composed of a plate fin tube heat exchanger, an accumulator ( 8) are connected by a refrigerant pipe, and the gas-liquid separator (6) and the compressor (1) are connected by an injection passage (11) having an electromagnetic valve (9).

The compressor (1) is a rotary compressor provided with an injection port for injecting an intermediate-pressure gas refrigerant.

The accumulator (8) is composed of a closed cylindrical container, and is provided on the side of the compressor (1). The accumulator (8) is located closer to the center of the outdoor unit (10) than the compressor (1). Outlet pipe (41) of accumulator (8)
Extends upward from the upper end of the accumulator (8) and
It is connected to a low-pressure refrigerant suction port (not shown) provided in the lower part of (1). The accumulator (8) is connected to this outlet pipe (4
1) is supported by the compressor (1).

The gas-liquid separator (6) is composed of an elongated closed cylindrical container, and is installed in a gap created between the compressor (1) and the accumulator (8) as shown in FIG. Have been. That is, the gas-liquid separator (6) is provided on the side of the compressor (1) so as to be almost in contact with the compressor (1) and the accumulator (8). In other words, the gas-liquid separator (6) is provided in a space in which the compressor (1) and the accumulator (8) are not effectively used in the space.
The outlet pipe (42) of the gas-liquid separator (6) constituting the injection passage (11) extends upward from the upper end of the gas-liquid separator (6),
It is connected to an injection port (not shown) of the compressor (1). The gas-liquid separator (6) is supported by the compressor (1) by the outlet pipe (42).

As shown in FIG. 3, the compressor (1), the accumulator (8), and the gas-liquid separator (6) are integrally wrapped in a sound insulating material (25) having heat insulation. ing. That is, the soundproofing material (25) is provided so that heat generated in the compressor (1) is efficiently transmitted to the gas-liquid separator (6) and the accumulator (8). In FIG. 1, illustration of the soundproof material (25) is omitted to facilitate understanding of the configuration of the outdoor unit (20).

FIG. 4 is a front view of the outdoor unit (20) in which a part of the casing (15) is cut away. For simplicity of description, some piping is omitted.

At the bottom of the gas-liquid separator (6), two pipes (1
6) and (17) are extended. The first electric expansion valve is connected to the pipe (16).
(4) The pipe (17) is provided with a second electric expansion valve (5). The outlet pipe (42) is provided with a solenoid valve (9).

Above the compressor (1), an electrical component board (3) provided with electrical components for performing various controls of the refrigerant circuit (22).
9) is provided. This electrical component is the compressor (1), the first
Electric power and electric signals are supplied to the electric expansion valve (4), the second electric expansion valve (5), and the solenoid valve (9). The supply of the electric power and the electric signal is performed via an integrated electric wire (37) described below.

-Integrated Wire (37)-The integrated wire (37) is one of the features of the present invention, and is used for supplying electric power to the compressor (1) to drive and control the compressor (1). The first electric expansion valve for supplying an electric signal to the compressor electric wire (31), the head thermo (35), and the first electric expansion valve (4) to drive and control the first electric expansion valve (4). A second electric expansion valve electric wire (33) for supplying an electric signal to the second electric expansion valve (5) to drive and control the second electric expansion valve (5); An electromagnetic valve electric wire (34) for supplying an electric signal to 9) and controlling the operation of the electromagnetic valve (9) is formed in a single cable (37a). The compressor electric wire (31) is composed of three electric wires for a three-phase power supply.

Specifically, as shown in FIG. 5, the integral electric wire (37) is composed of a compressor electric wire (31), a head thermo (35),
The electric expansion valve electric wire (32), the second electric expansion valve electric wire (33), and the solenoid valve electric wire (34) are separated from each other by a predetermined distance via an insulating member (27) so as not to contact each other, It is configured to be surrounded by an outer skin (26).

At one end of the integrated electric wire (37), each electric wire (31)-
(35) is connected to the compressor (1), the electric expansion valves (4) and (5), and the solenoid valve (9), respectively. On the other hand, the other end of the integrated electric wire (37) is provided with a socket (38) detachable from the electrical component board (39). The socket (38) is provided with a terminal (not shown) corresponding to each of the electric wires (31) to (35).
Is provided with a socket insertion portion (38a) corresponding to each terminal. Therefore, the integrated electric wire (37) and the electrical component board
For connection with (39), the socket (38) is inserted into the socket insertion part (38a).
This is done by inserting

-Operation of Air Conditioner (30)-Next, the operation of the air conditioner (30) will be described.

The air conditioner (30) can perform four types of operations: a non-injection heating operation, an injection heating operation, a non-injection cooling operation, and an injection cooling operation. The heating operation and the cooling operation differ only in the direction of circulation of the refrigerant and have the same basic operation. Therefore, only the heating operation will be described below, and the description of the cooling operation will be omitted. The refrigerant circulation direction is switched by switching the four-way switching valve (2).

-Non-Injection Heating Operation- In the non-injection heating operation, an electric signal is sent from the electric component of the electric component board (39) through the integrated electric wire (37), and the solenoid valve (9) is set to the closed state. Then, the first electric expansion valve (4) and the second electric expansion valve (5) are set to a predetermined opening degree according to the operation state. The four-way switching valve (2) is switched to the broken line side shown in FIG.

The refrigerant circulates in the direction shown by the dashed arrow. The high-pressure refrigerant discharged from the compressor (1) passes through the four-way switching valve (2) and then flows into the indoor heat exchanger (3). The high-pressure refrigerant is condensed in the indoor heat exchanger (3) and heats indoor air. The condensed liquid refrigerant flows out of the indoor heat exchanger (3), is reduced to an intermediate pressure by the first electric expansion valve (4), and flows into the gas-liquid separator (6).
Then, the pressure is reduced to a low pressure by the second electric expansion valve (5) without passing through the injection passage (11). The low-pressure refrigerant evaporates in the outdoor heat exchanger (7). After passing through the four-way switching valve (2), the low-pressure refrigerant flows into the accumulator (8) and is sucked into the compressor (1). As described above, the refrigerant circulates through the refrigerant circuit (22) to heat the room.

-Injection heating operation- During the injection heating operation, the electrical component board
An electric signal is sent from the electrical component of (39) through the integrated electric wire (37), the solenoid valve (9) is set to the open state, and the first electric expansion valve
(4) and the second electric expansion valve (5) are set to a predetermined opening degree according to the operation state. The four-way switching valve (2) is set on the broken line side shown in FIG.

The refrigerant circulates in the direction indicated by the dashed arrow. As shown in FIGS. 2 and 6, the high-pressure gas refrigerant (E1) discharged from the compressor (1) flows into the indoor heat exchanger (3) after passing through the four-way switching valve (2). The high-pressure gas refrigerant (E1) is condensed in the indoor heat exchanger (3) to become a high-pressure liquid refrigerant (F). High pressure liquid refrigerant
(F) flows out of the indoor heat exchanger (3) and the first electric expansion valve (4)
The pressure is reduced to an intermediate pressure, and the refrigerant becomes an intermediate-pressure two-phase refrigerant (G). The intermediate-pressure two-phase refrigerant (G) flows into the gas-liquid separator (6). Then, the intermediate-pressure refrigerant (G) is separated into an intermediate-pressure gas refrigerant (C) and a liquid refrigerant (H) in the gas-liquid separator (6).

The intermediate-pressure liquid refrigerant (H) is supplied to the second electric expansion valve (5).
The intermediate pressure is reduced to a low pressure by the low pressure two-phase refrigerant
(I). And the low-pressure two-phase refrigerant (I) is an outdoor heat exchanger
Evaporate in (7). The low-pressure refrigerant flowing out of the outdoor heat exchanger (7) passes through the four-way switching valve (2), passes through the accumulator (8), and is sucked into the compressor (1) as the suction gas refrigerant (A) .

On the other hand, the intermediate-pressure gas refrigerant (C) in the gas-liquid separator (6) passes through the injection passage (11) to the compressor.
Inhaled in (1). By the way, the compressor (1) and the gas-liquid separator
(6) means that the entire body is insulated by the soundproofing material (25), so the heat generated by the compressor (1) is not radiated to the outside of the space surrounded by the soundproofing material (25), and the gas-liquid separator Heat (6). Therefore, the amount of the intermediate-pressure gas refrigerant injected into the compressor (1) increases.

Medium-pressure gas refrigerant sucked into the compressor (1)
(C) is mixed and compressed with the gas refrigerant (B), and the high-pressure gas refrigerant (E1)
And discharged from the compressor (1).

As described above, the refrigerant circulates through the refrigerant circuit to heat the room. In the injection heating operation, the intermediate-pressure gas refrigerant is injected into the compressor (1), so that the refrigerant circulation amount in the condenser increases, and the heating capacity is improved.

-Effects of the outdoor unit (20)-In the outdoor unit (20), the gas-liquid separator (6) is provided in the gap between the compressor (1) and the accumulator (8). Tableware (6)
No extra space is required for installation. Therefore, the outdoor unit (20) can be made compact.

Further, since the compressor (1) and the gas-liquid separator (6) are entirely wrapped with a sound insulating material (25) having heat insulation, the gas-liquid separation is performed by the heat generated by the compressor (1). The vessel (6) can be efficiently heated. That is, the heat generated in the compressor (1) can be effectively utilized without wasting. Therefore, the enthalpy of the intermediate-pressure refrigerant in the gas-liquid separator (6) can be increased, and the amount of the intermediate-pressure gas refrigerant sucked into the compressor (1) can be increased. As a result, the enthalpy of the refrigerant when the intermediate-pressure refrigerant is mixed in the compressor (1) increases from Id to Id1, as shown in FIG. Accordingly, the enthalpy of the gas discharged from the compressor (1) also increases. As a result, the amount of change in the enthalpy of the refrigerant in the condenser can be increased from Ia to Ia + Ib. That is, in the air conditioner (30), the enthalpy of the high-pressure gas discharged from the compressor (1) can be increased, and in addition to the effect of increasing the amount of circulating refrigerant in the condenser, the effect of increasing the enthalpy difference is also obtained. And the heating capacity can be further improved.

That is, when the refrigerant circulation amount is G and the enthalpy difference of the refrigerant in the condenser is I, the heating capacity is Q =
Although it can be roughly estimated by G × I, in the case of the present embodiment, both G and I can be increased, and the heating capacity Q is further improved. Therefore, the performance of the air conditioner (30) is improved by using the outdoor unit (20).

Since the outdoor unit (20) uses the sound insulating material (25) having heat insulation, it is not necessary to separately provide a heat insulating material. In addition, since the generally used soundproofing material (25) has a certain degree of heat insulation, it is possible to use the soundproofing material (25) conventionally used as it is.
Therefore, there is no extra cost for heating the gas-liquid separator (6).

The gas-liquid separator (6) is provided by the soundproof material (25).
Since the sound generated in the above is also soundproofed, noise is reduced.

Since the accumulator (8) is also heated for the same reason, the danger of liquid back to the compressor (1) is extremely small. The sound generated in the accumulator (8) is also soundproofed by the soundproofing material (25).

Further, various devices such as the compressor (1), the first electric expansion valve (4), the second electric expansion valve (5), and the solenoid valve (9) are connected to the electric components of the electric component board (39). Since the connection is made via the integrated electric wire (37), the wiring is not bulky and the wiring work is easy. That is, workability at the time of attachment and detachment is improved. In addition, a socket (3
Since (8) is formed, connection with the electrical component board (39) is easy. Further, the possibility of erroneous wiring is extremely low. Therefore, by using the outdoor unit (20),
The reliability of (30) is improved.

[0052]

Second Embodiment As shown in FIGS. 7 and 8, a refrigeration unit according to a second embodiment is an outdoor unit (23) mainly aimed at lowering the vibration of the compressor (1). The outdoor unit of the second embodiment
(23) is a compressor (1) compared with the outdoor unit (20) of the first embodiment.
Only the arrangement of the accumulator (8) and the gas-liquid separator (6) is different, and the other parts are the same as those of the outdoor unit (20).

In the outdoor unit (23), the accumulator (8), the compressor (1) and the gas-liquid separator (6) are arranged so as to be aligned in a straight line in order. That is, the gas-liquid separator (6) is provided symmetrically with the accumulator (8) on the side of the compressor (1) opposite to the accumulator (8).

Also in the outdoor unit (23) of the second embodiment, the compressor (1), the gas-liquid separator (6), and the accumulator (8) are entirely formed of a soundproof material (25) having heat insulating properties. Wrapped together.

-Effects of outdoor unit (23)-In the outdoor unit (23), the accumulator (8) and the compressor (1)
And the gas-liquid separator (6) are arranged in a straight line in order,
The force applied to the compressor (1) is substantially balanced by the load of the accumulator (8) and the load of the gas-liquid separator (6). for that reason,
Since no unbalanced force is applied to the compressor (1), the vibration of the compressor (1) is suppressed. As a result, vibration noise is reduced. In addition, since the performance deterioration of the compressor (1) due to the vibration is suppressed, the performance of the compressor (1) is improved, and the performance of the air conditioner (30) is improved. Also, the possibility of damage to the piping due to vibration is significantly reduced.

Also in the air conditioner (30) using the outdoor unit (23) of the second embodiment, the enthalpy difference in the condenser increases as in the first embodiment, and the performance is improved. Further, since the integrated electric wire (37) is provided, the workability of wiring is improved and the possibility of incorrect wiring is low, and the reliability of the air conditioner (30) is improved.

-Other Embodiments- In the first and second embodiments, the electric expansion valves (4) and (5) are used for both the first pressure reducing mechanism and the second pressure reducing mechanism. An electric expansion valve may be used, and a fixed pressure reducing mechanism (for example, a capillary tube or the like) may be used for the other.

The electrical component board (39) is an aggregate of electrical components, and is not limited to a plate-like board. For example, it may be a housing. Further, it may be provided in a part of the casing (15).

The applicable range of the refrigeration unit according to the present invention is as follows.
It is not limited to the air conditioner. It is also possible to use as a so-called refrigerating device or a refrigerating unit of a refrigerating device.
Further, the present refrigeration unit can be applied to various refrigeration circuits such as a refrigeration circuit dedicated to cooling.

[0060]

As described above, according to the present invention, the following effects are exhibited.

According to the first aspect of the present invention, it is not necessary to provide an extra space for providing a gas-liquid separator for separating the intermediate-pressure refrigerant into gas and liquid by effectively utilizing a wasteful space in the refrigeration unit. Therefore, the refrigeration unit can be made compact.

Efficient gas-liquid separator with heat generated by compressor
Can be heated. Therefore, the cooling in the condenser
Large enthalpy change of the medium can be secured,
It is possible to increase the contraction ability.

According to the second aspect of the present invention, since unbalanced load is not applied to the compressor, vibration of the compressor is reduced. As a result, the performance and reliability of the refrigeration circuit are improved.

According to the third aspect of the present invention, the gas-liquid separator can be efficiently heated by the heat generated in the compressor. Therefore, a large amount of change in enthalpy of the refrigerant in the condenser can be secured, and condensing capacity can be increased.

According to the fourth aspect of the present invention, the workability of wiring of the refrigeration unit is improved, and the possibility of incorrect wiring is reduced. Therefore, the reliability of the refrigeration circuit can be improved.

According to the fifth aspect of the present invention, connection and disconnection between the integrated electric wire and the electrical component are facilitated.

[Brief description of the drawings]

FIG. 1 is a perspective view of an outdoor unit according to a first embodiment.

FIG. 2 is a refrigerant circuit diagram of the air conditioner.

FIG. 3 is a plan view showing an arrangement relationship among a compressor, an accumulator, and a gas-liquid separator.

FIG. 4 is a partially cutaway front view of the outdoor unit.

FIG. 5 is a cross-sectional view of the integrated electric wire.

FIG. 6 is a Mollier diagram.

FIG. 7 is a diagram corresponding to FIG. 1 of the second embodiment.

FIG. 8 is a diagram corresponding to FIG. 3 of the second embodiment.

FIG. 9 is a refrigerant circuit diagram of a conventional injection refrigeration apparatus.

FIG. 10 is a diagram corresponding to FIG. 1 of a conventional outdoor unit.

FIG. 11 is a diagram corresponding to FIG. 3 of a conventional outdoor unit.

[Explanation of symbols]

 (1) Compressor (4) First electric expansion valve (5) Second electric expansion valve (6) Gas-liquid separator (7) Plate fin tube heat exchanger (8) Accumulator (9) Solenoid valve (11) Injection Passageway (20), (23) Outdoor unit (25) Sound insulation material (30) Air conditioner (37) Integrated wire (38) Socket (39) Electrical component board

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-136008 (JP, A) JP-A-8-145483 (JP, A) JP-A-8-145489 (JP, A) JP-A-8-145489 303818 (JP, A) Japanese Utility Model Showa 56-74219 (JP, U) Japanese Utility Model Hei 1-167530 (JP, U) Japanese Utility Model Showa 60-92069 (JP, U) (58) Fields surveyed (Int. ⁷ , DB name) F24F 5/00

Claims (5)

(57) [Claims] A compressor (1) of a refrigeration circuit (22) for injecting an intermediate-pressure gas refrigerant into the compressor (1), and a suction refrigerant of the compressor (1) provided in the refrigeration circuit (22). And a second gas-liquid separator (6) provided in the refrigeration circuit (22) for gas-liquid separation of the intermediate-pressure refrigerant of the refrigeration circuit (22). Wherein the first gas-liquid separator (8) is disposed adjacent to the compressor (1) on the side of the compressor (1), while the second gas-liquid separator (8) is liquid separator (6) is disposed in the gap portion generated between the compressor (1) and the first gas-liquid separator (8), the compressor (1) and the first gas-liquid separator ( 8) and the second gas-liquid
The separator (6) is separated by a sound insulating material (25) having heat insulation.
A refrigeration unit that is physically wrapped . 2. A compressor (1) of a refrigeration circuit (22) for injecting intermediate-pressure gas refrigerant into the compressor (1), and a suction refrigerant of the compressor (1) provided in the refrigeration circuit (22). And a second gas-liquid separator (6) provided in the refrigeration circuit (22) for gas-liquid separation of the intermediate-pressure refrigerant of the refrigeration circuit (22). And the first gas-liquid separator (8) is disposed beside the compressor (1), while the second gas-liquid separator (6) is The first gas-liquid separator (8), the compressor (1), and the second gas-liquid separator are disposed on the side of the compressor (1) opposite to the gas-liquid separator (8). The refrigeration unit, wherein the refrigeration units (6) are sequentially located on a straight line. 3. The refrigeration unit according to claim 2 , wherein the compressor (1), the first gas-liquid separator (8), and the second gas-liquid separator (6) are provided with a sound insulating material having heat insulating properties. A refrigeration unit characterized by being integrally wrapped by 25). 4. The refrigeration unit according to claim 1, wherein the refrigeration circuit (22) reduces the pressure of the high-pressure refrigerant to an intermediate pressure to produce a second refrigerant.
A first pressure reducing mechanism (4) for supplying to the gas-liquid separator (6), a second pressure reducing mechanism (5) for reducing the pressure of the intermediate-pressure refrigerant flowing out of the second gas-liquid separator (6) to a low pressure, Injection passage for supplying pressurized gas refrigerant from the second gas-liquid separator (6) to the compressor (1)
And a solenoid valve (9) for opening and closing the compressor (1), wherein at least one of the first pressure reducing mechanism (4) and the second pressure reducing mechanism (5) is constituted by an electric expansion valve, and the compressor (1) Wire for compressor for drive control (31)
An electric expansion valve electric wire (32, 33) for driving and controlling the electric expansion valve and an electromagnetic valve electric wire (34) for driving and controlling the electromagnetic valve (9) are integrally formed. One cable
A refrigeration unit comprising the integrated electric wire (37) configured in (37a). 5. The refrigeration unit according to claim 4, wherein at one end of the cable (37a), a socket (38) detachable from an electrical component board (39) is formed. .