KR20090130043A - Mechanism for controlling and operating compressor capacity and air conditioner havig the same - Google Patents

Abstract

A mechanism for controlling and operating a compressor capacity and an air conditioner having the mechanism. The mechanism achieves, without a rise in cost, capacity control of a compressor in the same way as in the case where two two-way valves are used. A circuit (35) for controlling and operating compressor capacity has a pilot valve (90) for a four-way switch valve, having four connection thin pipes (93a-93d), a suction branch pipe (87), an intermediate pipe (88), and a discharge branch pipe (89). The suction branch pipe (87) is connected to the first thin pipe (93a), which is one of the four connection thin pipes and is branched from a suction pipe (28) of the compressor (22), and has a larger diameter than the first thin pipe (93a). The intermediate pipe (88) is connected to the second thin pipe (93b), which is one of the four thin pipes and is connected to a cylinder intermediate section (79) of the compressor (22), and has a larger diameter than the second thin pipe (93b). The discharge branch pipe (89) is connected to the third thin pipe (93c), which is one of the four thin pipes and is branched from a discharge pipe (30) of the compressor (22), and has a larger diameter than the third thin pipe (93c).

Description

Compressor capacity control operation mechanism, and the air conditioner provided with the same {MECHANISM FOR CONTROLLING AND OPERATING COMPRESSOR CAPACITY AND AIR CONDITIONER HAVIG THE SAME}

The present invention relates to a compressor capacity control operation mechanism, and an air conditioner having the same, in particular, a compressor capacity control operation mechanism connected to the compressor to enable capacity control of the compressor, and an air conditioner including the same.

Conventionally, there exists an air conditioner provided with the vapor compression refrigerant circuit. In the air conditioner provided with such a refrigerant circuit, by adopting a configuration in which a compressor capacity control operation circuit is connected to a compressor, a full rod having a discharge capacity of 100% relative to a suction capacity ( The capacity control for switching the operation state of the compressor can be performed by an unload operation in which the discharge capacity is reduced with respect to the full load operation and the suction capacity. As the compressor capacity control operation circuit, a bypass pipe connecting the cylinder middle part of the compressor and the suction pipe of the compressor, an electromagnetic valve provided in the bypass pipe and functioning as an anisotropic valve, a discharge pipe of the compressor, It has a pilot tube connecting the cylinder middle part of the compressor and a capillary tube installed in the pilot tube, and the compressor is controlled by full load operation by closing the solenoid valve, and the compressor is opened by opening the solenoid valve. It can control by unloading operation (for example, refer patent document 1).

[Patent Document 1] Japanese Patent Laid-Open No. 9-72625

However, in the compressor capacity operation circuit described above, only the capillary tube is provided in the pilot tube, and thus, during the unloading operation, the refrigerant flowing into the suction tube from the intermediate portion of the cylinder through the pilot tube is passed through the pilot tube during the unloading operation. The refrigerant flowing into the bypass pipe from the discharge pipe is also applied, and a part of the refrigerant discharged from the compressor unnecessarily is bypassed to the suction pipe, which increases the power consumption of the compressor during unloading operation. Cause.

On the other hand, not only the bypass pipe but also the pilot pipe is provided with a solenoid valve functioning as an anisotropic valve, and during the unloading operation, the solenoid valve installed in the bypass pipe is opened, and the solenoid valve provided in the pilot pipe is closed. The refrigerant can be prevented from flowing into the bypass pipe from the discharge pipe through the pilot pipe. In this case, however, two solenoid valves functioning as anisotropic valves are required in the compressor capacity control operation circuit, resulting in a cost up.

An object of the present invention is to provide a compressor capacity control operation mechanism and an air conditioner having the same that enable the capacity control of a compressor similar to the case of using two anisotropic valves while preventing cost up.

According to the first invention The compressor capacity control operation mechanism is a compressor capacity control operation mechanism which is connected to the compressor and enables the capacity control of the compressor, and includes a flow path switching valve, a suction branch pipe, an intermediate pipe, a discharge branch pipe, and a fixing member. The flow path switching valve has a valve body, a first tubule, a second tubule and a third tubule. The valve body is connected to a first state in which the first flow path and the second flow path are connected, and the third flow path is not connected to any of the first and second flow paths, and the second flow path and the third flow path are connected. And a flow path configuration capable of switching to a second state in which the first flow path is not connected to any of the second and third flow paths, has the same function as the configuration using two anisotropic valves. The 1st customs pipe comprises the 1st flow path, and is extended from the valve main body. The second customs pipe constitutes a second flow path, and extends from the valve body. The third customs pipe constitutes a third flow path and extends from the valve body. The suction branch pipe branches from the suction pipe of the compressor, and is a larger diameter tube than the first tube pipe connected to the first tube pipe. The intermediate tube is connected to the cylinder middle portion of the compressor and is a larger diameter tube than the second fine tube connected to the second fine tube. The discharge branch pipe is branched from the discharge pipe of the compressor and is a tube having a larger diameter than the third fine pipe connected to the third fine pipe. The fixing member fixes at least one of the suction branch pipe, the intermediate pipe, and the discharge branch pipe, and the flow path switching valve.

Since the compressor capacity control operation mechanism is configured using a flow path switching valve having one of the first, second, and third tubules extending from the valve body, the connection portion with the suction branch pipe of the first tubule, The intensity | strength of the connection part with the intermediate pipe of a 2nd custom pipe, and the connection part with the discharge branch pipe of a 3rd fine pipe is low.

Thus, in this compressor capacity control operation mechanism, at least one of the suction branch pipe, the intermediate pipe, and the discharge branch pipe, and the flow path switching valve are fixed to the fixing member, thereby overloading the first, second, and third fine pipes. The stress does not work. Thereby, the compressor capacity control operation mechanism which enables the capacity | capacitance control of a compressor similar to the case of using two anisotropic valves, can be provided, preventing the cost-up which arises by using two anisotropic valves.

The compressor capacity control operating mechanism according to the second invention is the compressor capacity control operating mechanism according to the first invention, wherein the fixing of the suction branch pipe, the intermediate pipe, and the discharge branch pipe is fixed to the fixing member. The vicinity of the customs is fixed to the fixing member.

In this compressor capacity control operation mechanism, the suction branch pipe, the intermediate pipe, and the discharge branch pipe are fixed to the fixing member because the vicinity of the corresponding tubule is fixed to the fixing member. The position shift etc. in the vicinity of the customs of a branch pipe can be prevented reliably. Thereby, the stress acting on the 1st, 2nd, and 3rd capillary tubes can be made small certainly.

The compressor capacity control operation mechanism according to the third invention is a compressor capacity control operation mechanism which is connected to the compressor and enables the capacity control of the compressor, and includes a pilot valve for four-way switching valves having four connecting tubules, and a suction branch pipe. And an intermediate tube and a discharge branch pipe. The suction branch pipe is connected to the first custom pipe which is one of the four connection fine pipes, and branches from the suction pipe of the compressor. The intermediate pipe is connected to the second customs pipe, which is one of the four connecting fine pipes, and is connected to the cylinder middle part of the compressor. A discharge branch pipe is connected to the 3rd fine pipe which is one of four connection fine pipes, and is branched from the discharge pipe of a compressor.

In this compressor capacity control operation mechanism, since the pilot valve for four-way switching valve is used instead of two anisotropic valves, it is similar to the case where two anisotropic valves are used, preventing the cost-up caused by using two anisotropic valves. The compressor capacity control operation mechanism which enables the capacity control of the compressor of the compressor can be provided.

In the compressor capacity control operation mechanism according to the fourth invention, in the compressor capacity control operation mechanism according to the third invention, the fourth customs pipe, which is one of four connection customs, is closed.

In this compressor capacity control operation mechanism, since the flow path structure similar to the flow path structure comprised by two anisotropic valves can be implement | achieved by the simple process of closing one of the four connection tubules which a pilot valve for four-way switching valves has. The configuration is simplified.

An air conditioner according to a fifth invention includes a main compressor circuit of a vapor compression type including a compressor, a four-way switching valve, a first heat exchanger, an expansion mechanism, and a second heat exchanger, and a third or fourth invention. The compressor capacity control operation mechanism which concerns on this is provided, As a pilot valve for four-way switching valves, the same thing as the pilot valve for four-way switching valves which comprises a four-way switching valve is used.

In this air conditioner, since the pilot valve for four-way switching valve used for a compressor capacity control operation mechanism is the same as the pilot valve for four-way switching valve which comprises the four-way switching valve contained in a main refrigerant circuit, components can be shared. It can contribute to the cost down of the whole air conditioning apparatus by this.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the air conditioner which employ | adopted the compressor capacity control operation mechanism which concerns on one Embodiment of this invention.

2 is a perspective view illustrating a schematic internal structure of an outdoor unit.

FIG. 3 is a schematic longitudinal cross-sectional view showing the structure of part A of FIG. 1 (ie, the structure of the compressor and the compressor capacity control operation circuit).

<Explanation of symbols for the main parts of the drawings>

1: air conditioner

22: compressor

23: four way switching valve

24: outdoor heat exchanger (first heat exchanger)

25 expansion valve (expansion mechanism)

41: indoor heat exchanger (second heat exchanger)

28: suction pipe

30: discharge tube

79: middle of the cylinder

87: suction branch pipe

88: intermediate tube

89: discharge branch pipe

90, 23b: Pilot pilot valve (Euro flow valve, pilot valve for four-way valve)

91: valve body

93a: First Customs

93b: Second Customs

93c: Third Customs

93d: fourth customs

98: fixed member

EMBODIMENT OF THE INVENTION Hereinafter, based on drawing, the Example of the compressor capacity control operation mechanism which concerns on this invention, and the air conditioner provided with it are demonstrated.

(1) Configuration of the air conditioner

<All>

1 is a schematic configuration diagram of an air conditioner 1 employing a compressor capacity control operation mechanism according to an embodiment of the present invention. In the present embodiment, the air conditioner 1 is a device used for cooling and cooling indoors, and mainly includes an outdoor unit 2, an indoor unit 4, an outdoor unit 2, and an indoor unit 4. It is a so-called separate type air conditioner provided with the 1st refrigerant | coolant communication pipe | tube 6 and the 2nd refrigerant | coolant communication pipe | tube 7 which connect | connects. That is, in the present embodiment, the outdoor unit 2 and the indoor unit 4 are configured by being connected to the refrigerant communication pipes 6 and 7 installed locally after being shipped and installed at the installation site. . The refrigerant circuit 10 of the air conditioner 1 of the present embodiment is configured by the outdoor unit 2 and the indoor unit 4 being connected via the refrigerant communication pipes 6 and 7.

<Indoor unit>

Next, the structure of the indoor unit 4 is demonstrated using FIG.

The indoor unit 4 is connected to the outdoor unit 2 via the first refrigerant communication pipe 6 and the second refrigerant communication pipe 7 and constitutes a part of the refrigerant circuit 10. The indoor unit 4 mainly has an indoor refrigerant circuit 10b constituting a part of the refrigerant circuit 10. This indoor refrigerant circuit 10b mainly has an indoor heat exchanger 41 as a second heat exchanger.

In the present embodiment, the indoor heat exchanger 41 is a heat exchanger that functions as a heater of the refrigerant at the time of cooling and functions as a cooler of the refrigerant at the time of heating. One end of the indoor heat exchanger 41 is connected to the second refrigerant communication pipe 7, and the other end thereof is connected to the first refrigerant communication pipe 6.

In the present embodiment, the indoor unit 4 includes an indoor fan 42 for supplying the indoor air after sucking and heat-exchanging indoor air in the unit, thereby providing indoor air and an indoor heat exchanger 41. It is possible to heat exchange the refrigerant flowing through it. The indoor fan 42 is rotationally driven by the indoor fan motor 42a.

Moreover, the indoor unit 4 is equipped with the indoor control part 43 which controls the operation | movement of each part which comprises the indoor unit 4. As shown in FIG. And the indoor control part 43 has the microcomputer, memory, etc. which were installed in order to control the indoor unit 4, The control part etc. are made between the outdoor control part 37 and the outdoor control part 37 (it mentions later). It is possible to exchange.

<Outdoor unit>

Next, the structure of the outdoor unit 2 is demonstrated using FIGS. 2 is a perspective view showing a schematic internal structure of the outdoor unit 2. FIG. 3 is a schematic longitudinal cross-sectional view showing the structure of part A of FIG. 1 (that is, the structures of the compressor 22 and the compressor capacity control operation circuit 35).

The outdoor unit 2 is connected to the indoor unit 4 via the first refrigerant communication pipe 6 and the second refrigerant communication pipe 7 and constitutes an outdoor refrigerant circuit 10a as part of the refrigerant circuit 10. Doing.

The outdoor unit 2 has a structure in which the inside of the substantially rectangular rectangular box-shaped unit casing 51 is divided into a blower chamber S1 and a machine chamber S2 by a partition plate 56 extending vertically. And a trunk-shaped structure), and mainly includes a unit casing 51, an outdoor refrigerant circuit component (described later) constituting the outdoor refrigerant circuit 10a, an outdoor fan 36, and an outdoor unit 2. It has an electrical component assembly (not shown in FIG. 2) which functions as an outdoor control part 37 (refer FIG. 1) which controls the operation | movement of each part which comprises.

The unit casing 51 is mainly composed of a bottom plate 52 and a top plate (a 53-dot, two-dot chain line in Fig. 2) and a front plate (shown by a two-dot chain line in Fig. 2, 54). And a side plate (shown by a dashed-dotted line in FIG. 2) and a partition plate 56. FIG.

The bottom plate 52 is a laterally long substantially rectangular metal plate-like member constituting the bottom portion of the unit casing 51. The peripheral part of the base plate 52 is bent upward and bent. On the outer surface of the bottom plate 52, two fixed legs 57 fixed to the local installation surface are provided. The fixed leg 57 has a substantially U shape from the front of the unit casing 51, and is a metal plate member extending from the front side of the unit casing 51 toward the rear side.

The top plate 53 is a horizontally long, substantially rectangular metal plate member constituting the top surface portion of the outdoor unit 2.

The front plate 54 is mainly a metal plate-like member constituting the front part of the front part and the right side of the unit casing 51, and its lower part is fixed to the bottom plate 52 by screws or the like. The front plate 54 is provided with a blowout port 54a for blowing air taken in the blower chamber S1 to the outside through a suction port (not shown) formed on the back and left surfaces of the unit casing 51.

The side plate 55 is a metal plate member which mainly comprises the rear part and the right back surface part of the right side surface of the unit casing 51, The lower part is being fixed to the base plate 52 with a screw etc ..

The partition plate 56 is a metal plate-like member that extends vertically disposed on the bottom plate 52, and has two spaces left and right inside the unit casing 51 (that is, the blower chamber S1 and the machine chamber S2). It is arranged to divide by)). The partition plate 56 is fixed to the bottom plate 52 by screws or the like.

In this way, the unit casing 51 is divided into the blower chamber S1 and the machine chamber S2 by the partition plate 56. More specifically, the blower chamber S1 is a space surrounded by the bottom plate 52, the top plate 53, the front plate 54, and the partition plate 56, and the machine room S2 includes the bottom plate 52 and the top plate. It is a space surrounded by the 53, the front plate 54, the side plate 55, and the partition plate 56. As described later, the outdoor heat exchanger 24 and the outdoor fan 36 are disposed in the blower chamber S1, and the outdoor unit such as the compressor 22 or the four-way switching valve 23 is disposed in the machine chamber S2. Refrigerant circuit components and electronics assemblies (not shown) are disposed. In addition, in this unit casing 51, the inside of the machine room S2 is made visible by removing the part which faces the machine room S2 of the front plate 54. As shown in FIG.

The outdoor refrigerant circuit components constituting the outdoor refrigerant circuit 10a mainly include an accumulator 21, a compressor 22, a four-way switching valve 23, an outdoor heat exchanger 24 as a first heat exchanger, And an expansion valve 25 (not shown in FIG. 2) as an expansion mechanism, a first closing valve 26, and a second closing valve 27. Here, the outdoor heat exchanger 24 is arrange | positioned in the blower chamber S1, and outdoor refrigerant circuit components other than the outdoor heat exchanger 24 are arrange | positioned in the machine room S2.

The accumulator 21 is a container for temporarily collecting low pressure refrigerant circulating in the refrigerant circuit 10 connected between the inlet port of the compressor 22 and the four-way switching valve 23. In the present embodiment, the accumulator 21 It is arrange | positioned at the corner | angular part of the right rear side of S2 (refer FIG. 2). The outlet of the accumulator 21 is connected to the inlet of the compressor 22 by the first suction pipe 28, and the inlet of the accumulator 21 is connected to the four-way switching valve 23 by the second suction pipe 29. Connected.

The compressor 22 is a compressor having a function of sucking, compressing a low-pressure refrigerant, compressing the refrigerant into a high-pressure refrigerant, and then discharging the refrigerant. It is arrange | positioned in the center substantially from the plane of the machine room S2 in the state which left the space which arrange | positions (not shown in FIG. 2) upward (refer FIG. 2). The discharge port of the compressor 22 is connected to the four-way switching valve 23 by the discharge pipe 30. In addition, the internal structure of the compressor 22 and the compressor capacity control operation circuit 35 (not shown in FIG. 2) as a compressor capacity control operation mechanism connected to the compressor 22 will be described later. In addition, in the following description, when distinguishing parts except the compressor capacity control operation circuit 35 and the compressor capacity control operation circuit 35 from the refrigerant circuit 10, the compressor capacity control operation circuit among the refrigerant circuits 10 will be described. The part except (35) is called a main refrigerant circuit.

The four-way switching valve 23 is a valve for switching the direction of the refrigerant flow at the time of switching between cooling and heating, and connecting the discharge port of the compressor 22 and the outdoor heat exchanger 24 at the time of cooling. The accumulator 21 and the second closing valve 27 are connected, and when heating, the discharge port of the compressor 22 and the second closing valve 27 are connected, and the accumulator 21 and the outdoor heat exchanger 24 are connected. It is possible to connect. The four-way switching valve 23 is connected to the outdoor heat exchanger 24 by the first refrigerant pipe 31 (only a part of which is shown in FIG. 2), and the second closed valve by the fourth refrigerant pipe 34. It is connected to (27). In the present embodiment, the four-way switching valve 23 has a four-way switching valve body 23a and a pilot valve 23b (not shown in FIG. 1) connected to the four-way switching valve body 23a. This pilot valve 23b is called a pilot valve for four-way switching valves for operating the four-way switching valve body 23a when switching the cooling and heating described above, and is fixed to the four-way switching valve body 23a. (See Figure 2).

In the present embodiment, the outdoor heat exchanger 24 is a heat exchanger that functions as a cooler of a refrigerant that uses outdoor air as a heat source when cooled, and functions as a heater of a refrigerant that uses outdoor air as a heat source when heated. One end of the outdoor heat exchanger 24 is connected to the first refrigerant pipe 31 (only part of which is shown in FIG. 2) through a plurality of branch pipes 24a (not shown in FIG. 2). The other end of the outdoor heat exchanger 24 is connected to the second refrigerant pipe 32 via a plurality of branch pipes 24b (not shown in FIG. 2) and a fractionator 24c (not shown in FIG. 2). have. In the present embodiment, the outdoor heat exchanger 24 is a cross fin fin and tube type heat exchanger composed of a heat transfer tube and a plurality of fins, and is a blower chamber. It is arrange | positioned in S1. The outdoor heat exchanger 24 has an L shape in plan view and is disposed along the left side and the back side of the unit casing 51. In addition, a tube plate 24d is provided at the right end of the outdoor heat exchanger 24.

In this embodiment, the expansion valve 25 (not shown in FIG. 2) depressurizes the high-pressure refrigerant cooled in the outdoor heat exchanger 24 to the indoor heat exchanger 41 during cooling. At the time of heating, it is an electric expansion valve which can depressurize the high-pressure refrigerant cooled in the indoor heat exchanger 41 before sending it to the outdoor heat exchanger 24. One end of the expansion valve 25 is connected to the second refrigerant pipe 32. The other end of the expansion valve 25 is connected to the first closing valve 26 by the third refrigerant pipe 33.

The first closing valve 26 is connected to the refrigerant pipe (third refrigerant pipe 33 in the present embodiment) and the first refrigerant communication pipe 6 (in FIG. 2) by the two-dot chain line on the outdoor unit 2 side. The valve is installed in the connection portion with the figure). Further, the second closing valve 27 is connected to the refrigerant pipe (the fourth refrigerant pipe 34 in the present embodiment) and the second refrigerant communication pipe 7 in FIG. 2 on the outdoor unit 2 side. The valve is installed in the connection portion with the figure. The second closing valve 27 is connected to the four-way switching valve 23 by the fourth refrigerant pipe 34.

After the outdoor fan 36 receives air into the blower chamber S1 through suction ports (not shown) formed on the left side and the rear surface of the unit casing 51 and passes the outdoor heat exchanger 24, the unit casing It is a blowing fan which functions to blow out from the blower outlet 54a formed in the front surface of 51. The outdoor fan 36 is a propeller fan in a present Example, and is arrange | positioned downstream of the outdoor heat exchanger 24 in blower chamber S1. The outdoor fan 36 is configured to be rotationally driven by the outdoor fan motor 36a.

The electrical equipment assembly (not shown) is arrange | positioned in the upper space of the machine room S2, and has various electrical equipments, such as a control P board and an inverter board containing a microcomputer etc. for performing operation control.

Next, the internal structure of the compressor 22 and the compressor capacity control operation circuit 35 will be described in detail.

In the present embodiment, the compressor 22 mainly includes the compression element 62, the Oldham ring 73, and the compressor motor 75 in the casing 61, which is a vertical cylindrical container. And a hermetic compressor with a lower main bearing 76.

The casing 61 is mainly welded to the lower end of the trunk plate 61a, the upper cylindrical plate 61b welded and fixed to the upper end of the trunk plate 61a, and the cylindrical plate 61a of a substantially cylindrical shape. It has a lower hard plate 61c.

The compression element 62 is a scroll type compression element and mainly includes a fixed scroll 64 disposed above the housing 63 and the housing 63, and a movable scroll 65 engaged with the fixed scroll 64. Have The housing 63 is press-fitted to the trunk plate 61a over its entire circumferential surface on its outer circumferential surface. As a result, the inside of the casing 61 is mainly divided into a high pressure space S3 below the housing 63 and a low pressure space S4 above the housing 63. Moreover, the housing 63 is provided with the housing recessed part 63a recessed in the center of an upper surface, and the bearing part 63b extended downward from the center of a lower surface. In the bearing portion 63b, a bearing hole 63c penetrating in the vertical direction is formed, and the drive shaft 66 is rotatably inserted into the bearing hole 63c via the bearing 67. Embedded). The fixed scroll 64 mainly includes a wrap plate 64a and an involute wrap 64b formed on the bottom surface of the board 64a, and a second wrapper surrounding the wrap 64b. It has the outer peripheral wall 64c. In the hard plate 64a, the discharge passage 69 in communication with the compression chamber 68 (described later) and the enlarged recess 70 in communication with the discharge passage 69 are formed. The discharge passage 69 is formed to extend in the vertical direction at the central portion of the hard plate 64a. The enlarged recessed part 70 is comprised by the recessed part extended in the horizontal direction recessed in the upper surface of the hard plate 64a. The lid 71 is fixed to the upper surface of the fixed scroll 64 by a bolt 72 so as to prevent the enlarged concave portion 70. The cover 71 is covered by the enlarged recess 70 so as to be partitioned into the low pressure space S4 (that is, in communication with the high pressure space S3), and the operation sound of the compression element 62. The muffler space S5 which consists of an expansion chamber which makes a sound noise is formed. The movable scroll 65 mainly includes a hard plate 65a, a spiral wrap (involute) wrap 65b formed on the top surface of the hard plate 65a, and a bearing portion 65c formed on the bottom surface of the hard plate 65a. And the groove portions 65d formed at both ends of the hard plate 65a. And this movable scroll 65 is supported by the housing 63 by inserting the Oldham ring 73 in the groove part 65d. The upper end of the drive shaft 66 is inserted in the bearing portion 65c. The movable scroll 65 is incorporated into the compression element 62 in this manner so as to revolve within the housing 73 without rotating by rotation of the drive shaft 66. The wrap 65b of the movable scroll 65 is engaged with the wrap 64b of the fixed scroll 64. A compression chamber 68 is formed between the contact portions of both wraps 64b and 65b. And this compression chamber 68 is made so that the volume between the two wraps 64b and 65b may shrink toward the center with the revolution of the movable scroll 65. As shown in FIG. In addition, the compression element 62 is provided with a communication passage 74 over the fixed scroll 64 and the housing 63. This communication passage 74 is formed so that the scroll side passage 74a formed in the fixed scroll 64 and the housing side passage 74b formed in the housing 63 communicate with each other. The upper end of the communication passage 74, that is, the upper end of the scroll side passage 74a, is opened in the enlarged concave portion 70, and the lower end of the communication passage 74, that is, the housing side passage 74b. The lower end of) is opened in the high pressure space S3 from the lower end surface of the housing 63.

As described above, the Oldham ring 73 is a member for preventing the rotating movement of the movable scroll 65 and is fitted into an Oldham groove (not shown) formed in the housing 63.

The compressor motor 75 is a motor in which frequency control can be performed by an inverter control element or the like mounted in an electric component assembly (not shown) in this embodiment, and is disposed below the compression element 62. The compressor motor 75 is rotatable mainly having an annular stator 75a (stator) fixed to the inner wall surface of the casing 61 and a small gap (間隙, air gap passage) on the inner circumferential side of the stator 75a. It has a rotor 75b that is easily received. Copper wire is wound around the stator 75a, and coil ends are formed above and below. The rotor 75b is connected to the movable scroll 65 of the compression element 62 by the drive shaft 66 extending in the vertical direction.

The lower main bearing 76 is disposed in the lower space below the compressor motor 75. The lower main bearing 76 is fixed to the trunk plate 61a, forms a bearing on the lower end side of the drive shaft 66, and supports the drive shaft 66.

In addition, the upper hard plate 61b of the casing 61 penetrates the low pressure space S4 in the vertical direction, and an intake nozzle 77 having an inner end portion penetrated by the fixed scroll 64 is provided. 22) the inlet port. Moreover, the discharge nozzle 78 in which the inner end part opens in the high pressure space S3 is provided in the trunk plate 61a of the casing 61, and comprises the discharge port of the compressor 22. As shown in FIG.

Furthermore, the compressor 22 of the present embodiment is connected to the compressor capacity control operation circuit 35, so that the unloading of the full load operation in which the discharge capacity is 100% of the suction capacity and the discharge capacity of the suction capacity is reduced. Capacitance control for switching the operation state by operation is possible, and in order to realize such capacity control, a cylinder middle portion 79 is provided. The cylinder middle portion 79 mainly includes the unloading passage 80, the valve hole 81, the bypass passage 82, the valve 83, the spring 84, the cover 71, and the intermediate nozzle 85 described above. Has)

The unloading passage 80 is formed in the fixed scroll 64 so as to extend in the vertical direction, and its lower end portion communicates with the compression chamber 68.

The valve hole 81 is formed in the fixed scroll 64 so as to extend upward from the upper end of the unloading passage 80, and the upper end is covered by the lid 71.

The bypass passage 82 communicates with the low pressure space S4, the compression chamber 68, the unload passage 80, and the valve hole 81 so as to communicate with the low pressure space 68 from the compression chamber 68 during the unloading operation. A coolant is led to S4, which is a passage for substantially slowing down the compression start point, and is formed in the fixed scroll 64 so as to communicate the valve hole 81 and the low pressure space S4.

The valve 83 is disposed in the valve hole 81 in a state where the valve 83 is urged upward by the spring 84, and the pressure in the operating pressure chamber 86, which is formed above the valve 83, and the spring ( By the balance with the pressing force of 84, the inside of the valve hole 81 can be moved up and down. For this reason, when the valve 83 moves below (namely, when the pressure in the operation pressure chamber 86 is larger than the pressing force of the spring 84), the valve 83 will bypass the unloading passage 80 and bypass. When the passage 82 is divided and the valve 83 moves upward (that is, when the pressure in the operating pressure chamber 86 is smaller than the pressing force of the spring 84), the unload passage 80 and The bypass passage 82 is brought into communication.

The intermediate nozzle 85 penetrates the upper hard plate 61b, the low pressure space S4, and the lid 71 of the casing 61 in the vertical direction to communicate with the operation pressure chamber 86 of the valve hole 81. have. In this way, the compressor 22 operates the valve 83 according to the pressure associated with the operation pressure chamber 86 through the intermediate nozzle 85, whereby the cylinder capable of opening and closing the unload passage 80. The intermediate portion 79 is formed.

And the compressor capacity control operation circuit 35 is connected to the compressor 22 which has this cylinder intermediate part 79 as mentioned above. The compressor capacity control operation circuit 35 mainly includes a suction branch pipe 87, an intermediate pipe 88, a discharge branch pipe 89, and a pilot valve 90 as a flow path switching valve. In the embodiment, it is arranged in the space between the compressor 22 and the up-down direction of the four-way switching valve 23 (not shown in FIG. 2).

The suction branch pipe 87 is a refrigerant pipe branched from the suction pipe 28 of the compressor 22, and is smaller than the suction pipe 28 in this embodiment.

The intermediate tube 88 is a refrigerant tube connected to the cylinder intermediate portion 79 (more specifically, the intermediate nozzle 85) of the compressor 22. In the present embodiment, the intermediate tube 88 is substantially the same as the intermediate nozzle 85. Same diameter.

The discharge branch pipe 89 is a refrigerant pipe branched from the discharge pipe 30 of the compressor 22, and is smaller than the discharge pipe 30 in this embodiment.

The pilot valve 90 is a pilot valve for four-way switching valves in the present embodiment, and mainly includes a valve body 91, an electromagnetic coil 92, and four connecting tubules 93a, 93b, 93c, and 93d. have. This valve body 91 mainly has a valve case 94, a valve body 95, and a plunger 96. The valve case 94 is a substantially cylindrical member having a hollow space therein, and four ports 94a, 94b, 94c, 94d communicating with the space inside the outer peripheral portion thereof, and a shaft. An opening 94e into which the plunger 96 is retractably inserted is formed in a portion at one end in the direction. In the present embodiment, the second port 94b, the first port 94a, and the fourth port 94d are arranged side by side at substantially equal intervals in the axial direction from the position near the opening 94e, and the third port. The port 94c is disposed to face the first port 94a. And the valve main body 95 is arrange | positioned in the valve case 94, and is connected to the axial front-end | tip of the part inserted in the valve case 94 of the plunger 96. As shown in FIG. In the present embodiment, the valve main body 95 has a main shape, and is moved away from the opening 94e by inserting the plunger 96 deeply into the valve case 94, thereby moving the first port ( The second port 94b and the third port 94c are communicated together with the fourth port 94d and 94a communicated with each other so that the insertion of the plunger 96 into the valve case 94 is made shallow. The first port 94a and the second port 94b can communicate with each other, and the third port 94c and the fourth port 94d can communicate with each other. The electromagnetic coil 92 is disposed so as to surround the outer periphery of the portion projecting outward in the axial direction of the valve case 94 of the plunger 96. In the present embodiment, the plunger is in a non-energized state. 96 is deeply inserted into the valve case 94, whereby the valve body 95 moves away from the passageway 94e, and the first port 94a and the fourth port 94d communicate with each other. In addition, when the second port 94b and the third port 94c are in communication with each other, and the energization state is established, the insertion of the plunger 96 into the valve case 94 becomes shallow, whereby the valve The main body 95 moves to the side closer to the opening 94e, the first port 94a and the second port 94b communicate with each other, and the third port 94c and the fourth port 94d communicate with each other. It becomes One end of the first capillary tube 93a is connected to the first port 94a, and the other end thereof is connected to the suction branch pipe 87 having a larger diameter than the first capillary tube 93a. One end of the second customs tube 93b is connected to the second port 94b, and the other end thereof is connected to the intermediate tube 88 having a larger diameter than the second customs tube 93b. One end of the third capillary tube 93c is connected to the third port 94c, and the other end thereof is connected to the discharge branch pipe 89 having a larger diameter than the third capillary tube 93c. One end of the fourth customs tube 93d is connected to the third port 94d, and the other end thereof is closed. Thus, the valve main body 91 of the pilot valve 90 communicates with the 1st port 94a by closing the 4th fine pipe 93d which is one of four connection fine pipes, The 1st fine pipe 93a communicates with the 1st port 94a. And the second branch pipe 93b and the intermediate pipe 88 communicating with the second port 94b as the first flow path using the suction branch pipe 87 as the second flow path, and communicating with the third port 94c. In the case where the third fine pipe 93b and the discharge branch pipe 89 are used as the third flow path, the first flow path and the second flow path are connected, and the third flow path is connected to either of the first and second flow paths. The first state (which corresponds to the energized state of the electromagnetic coil 92 in the present embodiment), which is not in the state, and the second flow path and the third flow path are connected, and the first flow path is the second and third flow paths. Two flow path configurations which can be switched to the second state (which corresponds to the non-conduction state of the electromagnetic coil 92 in the present embodiment) that are not connected to any of the two It has the same function as configured using an anisotropic valve. Here, the state of the pilot valve 90 in FIG. 3 corresponds to the case where the electromagnetic coil 92 is in a non-energized state. In addition, the solid line attached to the pilot valve 90 in FIG. 1 respond | corresponds to the case where the electromagnetic coil 92 is in a non-energized state, and the broken line attached to the pilot valve 90 in FIG. This corresponds to the case where the coil 92 is in the energized state.

When the full load operation is performed, the electromagnetic coil 92 is set to the non-energized state so that the second port 94b and the third port 94c of the pilot valve 90 communicate with each other and the first port 94a. ) Is not in communication with any of the second and third ports 94b and 94c. As a result, the pressure in the operating pressure chamber 86 of the cylinder middle portion 79 becomes large, and the unload passage 80 and the bypass passage 82 are divided by the valve 83, so that the compression is performed. Compression work is done without delay in starting point. When the unloading operation is performed, the first port 94a and the second port 94b of the pilot valve 90 communicate with each other, and the third port 94c is one of the first and second ports 94a and 94b. We do not communicate with anything. As a result, the pressure in the operating pressure chamber 86 of the cylinder middle portion 79 decreases, the unload passage 80 and the bypass passage 82 communicate with each other, and the refrigerant is compressed from the compression chamber 68 to the low pressure space S4. Since the state is attracted, the compression work is performed in a state where the compression start point is late.

Thus, in the compressor capacity control operation circuit 35 of this embodiment, since the pilot valve 90 for four-way switching valves is used instead of two anisotropic valves, the cost increase which arises by using two anisotropic valves is made. While blocking, the capacity | control of the compressor 22 similar to the case of using two anisotropic valves can be enabled. In addition, in the pilot valve 90 having the same flow path configuration as the flow path configuration formed by the two anisotropic valves, one of the four connecting custom pipes 93a, 93b, 93c, and 93d (in this embodiment, the fourth customs pipe) Since it is realized by a simple process of closing (93d)), the configuration is simplified. In addition, in this embodiment, since the pilot valve 90 uses the same thing as the pilot valve 23b for four-way switching valves which comprise the four-way switching valve 23 contained in a main refrigerant circuit, components are commonized. This can contribute to the cost down of the whole air conditioner 1 by this.

However, in the compressor capacity control operation circuit 35 of the present embodiment, since the pilot valve 90 for four-way switching valve is adopted as the flow path switching valve, the first, second, and The one in which the three customs 93a, 93b, and 93c extend is used. For this reason, the connection part with the suction branch pipe 87 of the 1st fine pipe 93a, the connection part with the intermediate pipe 88 of the 2nd fine pipe 93b, and the discharge branch pipe of the 3rd fine pipe 93c ( The strength of the connection portion with 89 becomes low.

Therefore, in the compressor capacity control operation circuit 35 of this embodiment, at least one of the suction branch pipe 87, the intermediate pipe 88, and the discharge branch pipe 89 (here, the intermediate pipe 88 and the discharge portion). By fixing the engine 89 and the pilot valve 90 to the fixing member 98, it is possible to prevent excessive stress from acting on the first, second, and third capillaries 93a, 93b, 93c. It is possible to use the pilot valve 90 for four-way switching valves. Here, the fixing member 98 is a sheet metal member made of sheet metal, and in this embodiment, the connection portion between the second customs 93b and the intermediate tube 88 and the third customs It is arrange | positioned so that the connection part of 93c and the discharge branch pipe 89 may at least oppose. In the pilot valve 90, the electromagnetic coil 92 is fixed to the fixing member 98 by the band member 97e. In addition, the intermediate tube 88 and the discharge branch tube 89 are respectively fixed to the fixing member 98 by the band members 97b and 97c. In the present embodiment, the suction branch pipe 87, the suction branch pipe 87, the intermediate pipe 88, and the discharge branch pipe 89 are fixed to the fixing member 98 (here, the intermediate The pipes 88 and the discharge branch pipes 89 are the suction branch pipes 87, the intermediate pipes 88, and the vicinity of the corresponding fine pipes 93b and 93c, because they are fixed to the fixing member 98. It is possible to reliably prevent positional shifts and the like in the vicinity of the capillary of the discharge branch pipe 89, thereby making it possible to surely reduce the stress acting on the first, second, and third capillaries 93a, 93b, 93c. It is supposed to be. In addition, in this embodiment, although the connection part of the 1st fine pipe 93a and the suction branch pipe 87 is not fixed to the fixing member 98, the suction branch pipe 87 and the intermediate pipe 88 are not fixed. At least one of, and the discharge branch pipe 89 may be fixed to the fixing member 98. For example, similar to the intermediate tube 88 and the discharge branch pipe 89, the suction branch pipe 87 The band member may be fixed to the fixing member 98, or any one of the suction branch pipe 87, the intermediate tube 88, and the discharge branch pipe 89 may be fixed to the fixing member 98.

In addition, the outdoor control unit 37 has a microcomputer, a memory, or the like provided for controlling the outdoor unit 2, and exchanges control signals or the like with the indoor control unit 43 of the indoor unit 4. It is possible to do it. That is, the control part as an operation control means which performs the operation control of the air conditioner 1 by the indoor control part 43 and the outdoor control part 37 is comprised.

As described above, the outdoor refrigerant circuit 10a, the indoor refrigerant circuit 10b, and the refrigerant communication pipes 6 and 7 are connected to each other so that the compressor 22, the four-way switching valve 23, and the outdoor heat exchanger as the first heat exchanger. Main refrigerant circuit comprising a gas 24, an expansion valve 25 as an expansion mechanism, and an indoor heat exchanger 41 as a second heat exchanger, and a compressor 22 connected to the compressor 22 to control the capacity of the compressor 22. A refrigerant circuit (10) capable of cooling and heating the room is configured to have a compressor capacity control operation circuit (35). And the air conditioner 1 of this embodiment can control each apparatus of the outdoor unit 2 and the indoor unit 4 by the control part which consists of the indoor control part 43 and the outdoor control part 37. FIG. It is supposed to be.

(2) the operation of the air conditioner

<Operation at Full Road Operation>

First, the operation at the time of cooling is demonstrated using FIG. 1 and FIG.

At the time of cooling, the four-way switching valve 23 is shown by the solid line of FIG. 1, that is, the discharge side of the compressor 22 is connected to the outdoor heat exchanger 24, and the suction side of the compressor 22 is provided. 2 is connected to the closing valve 27. The expansion valve 25 is adapted to adjust the opening degree. In addition, the closing valves 26 and 27 are in an open state. Furthermore, the electromagnetic coil 92 of the pilot valve 90 is in a non-energized state.

In the state of the refrigerant circuit 10, when the compressor 22, the outdoor fan 36, and the indoor fan 42 are started, the low pressure refrigerant is sucked into the compressor 22 and compressed to become a high pressure refrigerant. . Here, since the electromagnetic coil 92 of the pilot valve 90 is in a non-energized state, the second port 94b and the third port 94c of the pilot valve 90 communicate with each other and the first port 94a. ) Is not in communication with any of the second and third ports 94b and 94c. As a result, in the compressor 22, the compression work is performed without delay in the compression start point, On the contrary, the full load operation in which the discharge capacity is 100% is performed. Thereafter, the high-pressure refrigerant is sent to the outdoor heat exchanger 24 which functions as a cooler of the refrigerant via the four-way switching valve 23, and performs heat exchange with the outdoor air supplied by the outdoor fan 36 to cool it. do. The high-pressure refrigerant cooled in the outdoor heat exchanger 24 is reduced in pressure by the expansion valve 25 to become a refrigerant in a low-pressure gas-liquid two-phase state, and the first closing valve 26. ) And the first refrigerant communication pipe 6 are sent to the indoor unit 4. The refrigerant in the low-pressure gas-liquid two-phase state sent to the indoor unit 4 is evaporated by being heated by heat-exchanging with the indoor air in the indoor heat exchanger 41 functioning as a heater of the refrigerant, thereby becoming a low pressure refrigerant. . And the low pressure refrigerant | coolant heated in this indoor heat exchanger 41 is sent to the outdoor unit 2 via the 2nd refrigerant | coolant communication pipe 7, and the 2nd closing valve 27 and the four-way switching valve 23 are carried out. ) And the accumulator 21 are sucked into the compressor 22 again. In this way, cooling is performed. In addition, the capacity control of the compressor 22 at the time of this full load operation is mainly performed by the frequency control of the compressor motor 75.

Next, the operation at the time of heating is demonstrated using FIG. 1 and FIG.

At the time of heating, the state in which the four-way switching valve 23 is shown by the broken line in FIG. 1, that is, the discharge side of the compressor 22 is connected to the second closing valve 27, and the suction side of the compressor 22 is It is in the state connected to the outdoor heat exchanger 24. The expansion valve 25 is also adjusted to open. In addition, the closing valves 26 and 27 are in an open state. Furthermore, the electromagnetic coil 92 of the pilot valve 90 is in a non-energized state.

In the state of the refrigerant circuit 10, when the compressor 22, the outdoor fan 36, and the indoor fan 42 are started, the low pressure refrigerant is sucked into the compressor 22 and compressed to become a high pressure refrigerant. . Here, since the electromagnetic coil 92 of the pilot valve 90 is in a non-energized state, the second port 94b and the third port 94c of the pilot valve 90 communicate with each other and the first port 94a. ) Is not in communication with any of the second and third ports 94b and 94c. As a result, in the compressor 22, the compression work is performed without delay in the compression start point, With respect to this, a full load operation with a discharge capacity of 100% is performed. Thereafter, this high pressure refrigerant is sent to the indoor unit 4 via the four-way switching valve 23, the second closing valve 27, and the second refrigerant communication pipe 7. Then, the high-pressure refrigerant sent to the indoor unit 4 is cooled in the indoor heat exchanger 41 which functions as a cooler of the refrigerant, after being heat-exchanged with the indoor air, and then outdoor via the first refrigerant communication pipe 6. It is sent to the unit 2. The high pressure refrigerant sent to the outdoor unit 2 is reduced in pressure by the expansion valve 25 and becomes a refrigerant in a low pressure gas-liquid two-phase state, and flows into the outdoor heat exchanger 24 functioning as a heater of the refrigerant. The low-pressure gas-liquid two-phase refrigerant flowing into the outdoor heat exchanger 24 is evaporated by being heated by heat-exchanging with the outdoor air supplied by the outdoor fan 36 to become a low-pressure refrigerant, and is switched in all directions. Via the valve 23 and the accumulator 21, it is sucked into the compressor 22 again. In this way, heating is performed. In addition, the capacity control of the compressor 22 at the time of this full load operation is mainly performed by the frequency control of the compressor motor 75.

<Operation during Unloading Operation>

In the full load operation as described above, when the ratio of the refrigerant pressure on the high pressure side to the refrigerant pressure on the low pressure side of the refrigeration cycle falls below a predetermined range or when the frequency of the compressor motor 75 is relatively high. Since the operation is performed in a region where the operation efficiency of the refrigeration cycle is relatively good, the capacity control of the compressor 22 is often sufficient to control the frequency of the compressor motor 75.

However, when the ratio of the refrigerant pressure on the high pressure side to the refrigerant pressure on the low pressure side of the refrigeration cycle exceeds a predetermined range or when the frequency of the compressor motor 75 is in a low region, the frequency control of the compressor motor 75 is controlled. A situation arises in which the capacity control of the compressor 22 cannot be sufficiently performed by itself, or operation is performed in a region in which operation efficiency is poor.

Therefore, in such a case, the electromagnetic coil 92 of the pilot valve 90 is switched to the energized state, and the first port 94a and the second port 94b of the pilot valve 90 communicate with each other and the third The port 94c is not in communication with any of the first and second ports 94a and 94b. The unloading passage 80 and the bypass passage 82 communicate with each other and the compression chamber 68 The coolant is drawn to the low pressure space S4, whereby in the compressor 22, the unloading is performed in a state where the compression start point is delayed, and the discharge capacity is reduced with respect to the suction capacity. Operation is performed to avoid operation in a state where the frequency of the compressor motor 75 is low.

As a result, even when the ratio of the refrigerant pressure on the high pressure side to the refrigerant pressure on the low pressure side of the refrigerating cycle exceeds a predetermined range or when the frequency of the compressor motor 75 is in a low region, the maximum force operation is performed. The efficiency can be prevented from decreasing. In addition, similarly to the case of using two anisotropic valves, the pilot valve 90 does not cause a situation in which a part of the refrigerant discharged from the compressor 22 is bypassed from the discharge pipe 30 to the suction pipe 28. Therefore, the increase in the power consumption of the compressor 22 at the time of the unloading operation can also be suppressed. Furthermore, when switching between full load operation and unload operation, unlike the case where two anisotropic valves are used, only the pilot valve 90 may be controlled, thereby reducing the number of electrical wires and simplifying the control contents. have.

(3) another embodiment

As mentioned above, although the Example of this invention was described based on drawing, the specific structure is not limited to these Examples and can be changed in the range which does not deviate from the summary of invention.

<A>

In the above-mentioned embodiment, although the fourth fine pipe 93d is closed among the four connection pipes 93a-93d of the pilot valve 90, it is not limited to this, The four connection pipes 93a-93d are not limited to this. It is safe to close either. In this case, the capillary connected to the suction branch pipe 87, the intermediate pipe 88, and the discharge branch pipe 89 is changed in accordance with the closed capillary, and the pilot valve 90 is set to 2 as in the above-described embodiment. It is good to set it as the flow path structure similar to the flow path structure comprised by two anisotropic valves.

<B>

In the above-mentioned embodiment, although the scroll type compressor is used as the compressor 22, the compressor motor 75 is arrange | positioned in the high pressure space S3 filled with high pressure refrigerant | coolant, However, it is not limited to this, It is a rotary The compressor of another type, such as a compressor of the type | mold, may be sufficient, and the compressor motor 75 may be arrange | positioned in the space filled with the low pressure refrigerant | coolant.

<C>

In the above-described embodiment, as the outdoor unit 2, the air inside the unit casing 51 is divided into the blower chamber S1 and the machine chamber S2 by the partition plate 56. Although it was of the type which blows from the front surface of the unit casing 51, it is not limited to this, It may be an outdoor unit of another type, such as an outdoor unit of the type which blows air sucked in the unit casing from the top surface of a unit casing, etc. . Further, in the above-described embodiment, although one indoor unit 4 is connected to one outdoor unit 2, that is, a pair type and a separate type air conditioner 1, one or more outdoor units are used. Other types of air conditioners may be used, such as a multi-type air conditioner in which a plurality of indoor units are connected to the unit, a remote condenser type air conditioner, or the like.

According to the present invention, it is possible to provide a compressor capacity control operation mechanism and an air conditioner having the same that enable the capacity control of a compressor similar to the case of using two anisotropic valves while preventing cost up.

Claims (5)

A compressor capacity control operating mechanism connected to the compressor 22 and capable of capacity control of the compressor, A first state in which a first flow path and a second flow path are connected, and a third flow path is not connected to any of the first and second flow paths, and the second flow path and the third flow path are connected. And a flow path configuration capable of switching to a second state in which the first flow path is not connected to any of the second and third flow paths, and has a function similar to that configured using two anisotropic valves. A first tubule 93a constituting the valve body 91, the first flow path and extending from the valve body, a second tubule 93b constituting the second flow path and extending from the valve body; A flow path switching valve 90 constituting the third flow path and having the third fine pipe 93c extending from the valve body; A suction branch pipe (87) having a larger diameter than the first tube pipe branched from the suction pipe (28) of the compressor, and connected to the first tube pipe; An intermediate tube 88 having a larger diameter than the second fine tube connected to the cylinder intermediate portion 79 of the compressor, and connected to the second fine tube; A discharge branch pipe 89 having a larger diameter than the third fine pipe connected to the third fine pipe, branched from the discharge pipe 30 of the compressor; At least one of the suction branch pipe, the intermediate pipe, and the discharge branch pipe, and a fixing member 98 in which the flow path switching valve is fixed. Compressor capacity control operation mechanism having a. The method of claim 1, The suction branch tube 87, the intermediate tube 88, and the discharge branch tube 89 are fixed to the fixing member so that the vicinity of the corresponding tubules 93a, 93b, 93c is the fixing member. A compressor capacity control operating mechanism, which is fixed to (98). A compressor capacity control operating mechanism connected to the compressor 22 and capable of capacity control of the compressor, A pilot valve 90 for four-way switching valves having four connecting tubules, A suction branch pipe (87) connected to a first custom pipe which is one of the four connection pipes (93a, 93b, 93c, and 93d) and branched from the suction pipe (28) of the compressor; An intermediate pipe 88 connected to a second customs pipe, which is one of the four connecting custom pipes, and connected to the cylinder intermediate portion 79 of the compressor; The discharge branch pipe 89 connected to the 3rd custom pipe which is one of the said four connection fine pipes, and branched from the discharge pipe 30 of the said compressor. Compressor capacity control operation mechanism having a. The method of claim 3, The compressor capacity control operation mechanism of 4th customs which is one of said 4 connection customs (93a, 93b, 93c, 93d) is closed. A main vapor compression refrigerant circuit including the compressor (22), a four-way switching valve (23), a first heat exchanger (24), an expansion mechanism (25), and a second heat exchanger (41); The compressor capacity control operation mechanism of Claim 3 or 4 is provided, As the pilot valve 90 for four-way switching valve, the same thing as the pilot valve 23b for four-way switching valve which comprises the said four-way switching valve is used, Air conditioner.

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