JP2010059859A - Injectible two-stage compression rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injectible two-stage compression rotary compressor reducing pressure loss in an intermediate connecting pipe connecting a high-stage compressing section and an intermediate suction pipe and improving compression efficiency of the compressor. <P>SOLUTION: The injectible two-stage compression rotary compressor includes a compressor housing; the low-stage compressing section provided in the compressor house; the high-stage compressing section provided near the low-stage compressing section; a motor for driving the low-stage compressing section and the high-stage compressing section; an accumulator held at an outer side portion of the compressor housing; a low-pressure connecting pipe connecting the accumulator and the low-stage compressing section; the intermediate connecting pipe connecting the low-stage compressing section and the high-stage compressing section outside the compressor housing; and the intermediate suction pipe for introducing a medium pressure injection refrigerant into the intermediate connecting pipe. The intermediate suction pipe is connected to the intermediate connecting pipe so that an outlet of the intermediate suction pipe faces in a flowing direction of a medium pressure gas refrigerant in the intermediate connecting pipe. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an injection-compatible two-stage compression rotary compressor used in a heat pump system using an injection refrigeration cycle, and more specifically, in a middle communication pipe of an intermediate pressure gas refrigerant atmosphere, An intermediate pressure injection refrigerant which is a wet refrigerant is introduced.

  A conventional two-stage compression rotary compressor includes a low-stage compression section and a high-stage compression section, and a low-stage compression section and a high-stage compression section installed inside a sealed cylindrical compressor casing. A motor to be driven, and an accumulator installed on a side of the compressor housing.

  The compressor housing is provided with a first communication hole, a second communication hole, and a third communication hole in a row in the direction of the rotation axis, and the second communication hole is connected to the suction side of the low-stage compression unit. Thus, a low-stage suction pipe for sucking low-pressure refrigerant is arranged.

  The first communication hole is connected to the discharge side of the low-stage compression unit, and a low-stage discharge pipe that discharges the low-stage discharge refrigerant to the outside of the compressor housing is disposed. The third communication hole includes A high-stage suction pipe that is connected to the suction side of the high-stage compression section and sucks the low-stage discharge refrigerant is disposed.

  The low stage suction pipe and the lower part of the accumulator are connected by a low pressure communication pipe, and the low stage discharge pipe and the high stage suction pipe are connected by an intermediate connection pipe. Injection refrigerant separated by the gas-liquid separator of the refrigeration cycle is injected into the intermediate communication pipe through the intermediate suction pipe. The outlet of the intermediate suction pipe is directed in a direction perpendicular to the intermediate-pressure gas refrigerant flow in the intermediate communication pipe.

Japanese Patent Laying-Open No. 2006-152931 (5th and 6th pages, FIGS. 6 to 8)

  Normally, in the intermediate connecting pipe of a two-stage compression rotary compressor, the pressure gradually decreases because the refrigerant is sucked in by the high-stage compression section after having become intermediate pressure by the refrigerant discharged from the low-stage compression section. Pressure pulsation occurs at a period corresponding to the number of rotations.

  At the stage where the discharge process of the low-stage compression section is completed, the low-stage compression section and the intermediate connecting pipe are shut off, and the high-stage compression section is 180 degrees out of phase. Since the volume obtained by adding the volume of the high-stage compression portion to the intermediate connecting pipe at this stage is the smallest, the pressure in the intermediate connecting pipe at this stage is the highest. As the phase further advances, the suction step of the high-stage compression unit advances and the volume increases, so that the pressure in the intermediate connecting pipe decreases as the roller rotates. Accordingly, pressure pulsation increases in the intermediate communication pipe.

  When the outlet of the intermediate suction pipe is connected vertically to the intermediate connecting pipe, the intermediate pressure gas refrigerant flow in the intermediate connecting pipe and the injection refrigerant flow blown out from the intermediate suction pipe go straight, The pressure pulsation is further increased, and this pressure pulsation is propagated also in the injection pipe, resulting in a large pressure loss of the injection refrigerant, resulting in a problem that the compression efficiency of the compressor is deteriorated.

  The present invention has been made in view of the above, and is an injection that can reduce the pressure loss in the intermediate connecting pipe that connects the high-stage compression section and the intermediate suction pipe, and can improve the compression efficiency of the compressor. The object is to obtain a corresponding two-stage rotary compressor.

  In order to solve the above-described problems and achieve the object, the present invention is used in a heat pump system using an injection refrigeration cycle, and is first, second, and third communication holes that are axially separated from the outer peripheral wall in order. A sealed cylindrical compressor housing, and one end of the low-stage side suction pipe connected to the low-stage side suction hole through the second communication hole. A low-stage compression section in which one end of a low-stage discharge pipe is connected to the side muffler discharge hole through the first communication hole; and a high-stage side installed in the vicinity of the low-stage compression section in the compressor housing One end of a high-stage side suction pipe is connected to the suction hole through the third communication hole, and a high-stage side muffler discharge hole communicates with the inside of the compressor housing, the low-stage side compression part, A motor that drives the stage side compression unit and an outer side of the compressor housing A sealed cylindrical accumulator, a low-pressure connecting pipe connecting the bottom communication hole of the accumulator and the other end of the low-stage suction pipe, the other end of the low-stage discharge pipe and the high-stage suction In an injection-compatible two-stage compression rotary compressor, comprising: an intermediate connecting pipe that connects the other end of the pipe; and an intermediate suction pipe that guides the intermediate pressure injection refrigerant that is a wet refrigerant on the injection refrigeration cycle side to the intermediate connecting pipe The intermediate suction pipe is connected to the intermediate communication pipe so that the outlet of the intermediate suction pipe faces the intermediate pressure gas refrigerant flow direction of the intermediate communication pipe.

  In the injection-compatible two-stage compression rotary compressor according to the present invention, since the intermediate pressure gas refrigerant flow in the intermediate communication pipe and the injection refrigerant flow blown from the outlet of the intermediate suction pipe are parallel, the pressure pulsation in the intermediate communication pipe is small. Thus, there is an effect that the suction loss in the high stage side compression portion is reduced and the efficiency of the compressor is improved.

  Embodiments of the injection-compatible two-stage compression rotary compressor according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

1-1 is a figure which shows the basic composition of the refrigerating cycle of an air conditioner, FIG. 1-2 is a longitudinal cross-sectional view which shows Example 1 of the injection | emission 2 step | paragraph compression rotary compressor of the air conditioner concerning this invention. 1-3 is a cross-sectional view of the low-stage compression section and the high-stage compression section of the two-stage compression rotary compressor, and FIG. 1-4 is taken along line AA in FIG. 1-5 is a cross-sectional view of the low-stage end plate, FIG. 1-6 is a cross-sectional view taken along line BB of FIG. 1-5, and FIG. 7 is a front view of the compressor housing, FIG. 1-8 is a side view of the injection-compatible two-stage compression rotary compressor of the first embodiment, and FIG. 1-9 is an injection compatible 2 of the first embodiment. It is a longitudinal cross-sectional view which shows the modification of a stage compression rotary compressor, and FIGS. 1-10 is the injection | emission 2 stage | paragraph compression rotary pressure of Example 1. FIG. It is a longitudinal sectional view showing another modification of the machine.
The

  As shown in FIG. 1-1, the refrigeration cycle (heat pump system) of the air conditioner of Example 1 includes an injection-compatible two-stage compression rotary compressor (hereinafter simply referred to as “compressor”) 1 and a condenser (heat radiation). 4), a first expansion mechanism portion 7A, a second expansion mechanism portion 7B, an evaporator (heat absorber) 9, and a basic cycle pipe 2 that connects these in an annular shape.

  The compressor 1 is an injection-compatible two-stage compression rotary compressor that includes a low-stage compression section 12L and a high-stage compression section 12H, and uses an injection refrigerant that is an intermediate pressure between the condenser pressure and the evaporator pressure. An intermediate suction pipe 108 (see FIG. 1-2) for suction is connected to an intermediate communication pipe 23 that connects the low-stage compression section 12L and the high-stage compression section 12H. The compressor 1 is a so-called inverter compressor in which the rotation speed of the motor is variable depending on the supply power frequency.

  The first expansion mechanism unit 7A is a variable throttle mechanism that optimally controls the pressure of the condenser (heat radiator) 4 and the pressure of the evaporator (heat absorber) 9 according to the outside air temperature and the indoor set temperature. The second expansion mechanism portion 7B is a variable throttle mechanism for optimally controlling the injection refrigerant amount. The basic cycle piping 2 connects the above devices in order to circulate the refrigerant.

  The heat pump system for the air conditioner includes a branch pipe 5, an injection pipe 6, and an internal heat exchanger 8. The branch pipe 5 is disposed between the condenser (heat radiator) 4 of the basic cycle pipe 2 and the first expansion mechanism portion 7A, and branches the refrigerant into the basic cycle and the injection cycle.

  The injection pipe 6 connects the branch pipe 5 and the intermediate suction pipe 108 via the second expansion mechanism portion 7B. The internal heat exchanger 8 is between the basic cycle pipe 2a between the branch pipe 5 and the first expansion mechanism part 7A, and the injection pipe 6a between the second expansion mechanism part 7B and the intermediate suction pipe 108. Perform heat exchange.

  In this heat pump system of the air conditioner, a four-way valve 3 for reversing the direction of the refrigerant flow in the basic cycle is connected to the compressor 1 in order to cope with cooling and heating. When the four-way valve 3 is reversed, the functions of the condenser (heat radiator) 4 and the evaporator (heat absorber) 9 are reversed. In FIG. 1-1, since the state of the four-way valve 3 uses the heat exchanger connected between the four-way valve 3 and the branch pipe 5 as a condenser, heating operation is performed if this is arranged in the indoor unit. It is.

  In addition, although the heat pump system of the air conditioner of Example 1 is an example which can be injected only at the time of heating operation as what arrange | positions the heat exchanger connected between the four-way valve 3 and the branch pipe 5 in an indoor unit, The switching pipe for connecting the condenser (heat radiator) 4 and the evaporator (heat absorber) 9 to the first expansion mechanism 7A, the internal heat exchanger 8 and the branch pipe 5 on the basic cycle. Can be added even during cooling. Moreover, in the heat pump system of the air conditioner of Example 1, although the flow of the basic cycle refrigerant | coolant and the injection refrigerant | coolant in the internal heat exchanger 8 is made into parallel flow, you may pipe so that it may become counterflow.

  Next, with reference to FIG. 1-1, the flow of the refrigerant | coolant at the time of the heating operation in the heat pump system of the air conditioner of Example 1 is demonstrated. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 radiates heat by exchanging heat with air in the condenser (heat radiator) 4 and liquefies. Here, a part of the liquefied refrigerant is branched into the branch pipe 5 and becomes an injection refrigerant flowing through the injection pipe 6, and the other refrigerant is a basic cycle refrigerant flowing through the basic cycle pipe 2.

  The injection refrigerant that has flowed into the injection pipe 6 is depressurized to the intermediate pressure Pm by the second expansion mechanism section 7B to become a two-phase state at an intermediate temperature, and when it flows through the injection pipe 6a in the internal heat exchanger 8, internal heat exchange is performed. The heat is absorbed by exchanging heat with the refrigerant flowing through the basic cycle pipe 2a in the vessel 8 to increase the dryness. Thereafter, the injection refrigerant merges with the discharge gas from the low-stage compression section 12L, and is sucked into the high-stage compression section 12H in a gasified state as a whole.

  On the other hand, when the refrigerant flowing through the basic cycle pipe 2 flows through the basic cycle pipe 2a in the internal heat exchanger 8, it exchanges heat with the intermediate temperature injection refrigerant flowing through the injection pipe 6a in the internal heat exchanger 8. Dissipate heat to increase the degree of supercooling. Thereafter, the refrigerant flowing through the basic cycle pipe 2 is depressurized in the first expansion mechanism portion 7A to be in a low-temperature and low-pressure two-phase state, absorbs heat by exchanging heat with air in the evaporator (heat absorber) 9, and becomes superheated.

  Then, the refrigerant that has become overheated is sucked into the low-stage compression unit 12 </ b> L through the four-way valve 3 and the low-pressure communication pipe 31 of the compressor 1. The refrigerant sucked into the low-stage compression unit 12L is compressed by the low-stage compression unit 12L, merged with the injection refrigerant while being discharged from the low-stage compression unit 12L, and sucked into the high-stage compression unit 12H. The

  The refrigerant sucked into the high stage side compression unit 12H is compressed to a high final discharge pressure by the high stage side compression unit 12H and discharged into the compressor housing 10 of the compressor 1. The refrigerant discharged into the compressor housing 10 of the compressor 1 is discharged out of the compressor housing 10 through the discharge pipe 107.

  Next, an injection-compatible two-stage compression rotary compressor 1 according to the first embodiment will be described. As illustrated in FIG. 1B, the compressor 1 according to the first embodiment includes a compression unit 12 and a motor 11 that drives the compression unit 12 inside a sealed cylindrical compressor housing 10. ing.

  The stator 111 of the motor 11 is fixed by being shrink-fitted on the inner peripheral surface of the compressor housing 10. The rotor 112 of the motor 11 is disposed at the center of the stator 111 and is fixed by being shrink-fitted to a shaft 15 that mechanically connects the motor 11 and the compression unit 12.

  The compression unit 12 includes a low-stage compression unit 12L and a high-stage compression unit 12H connected in series to the low-stage compression unit 12L and installed on the upper side of the low-stage compression unit 12L. As illustrated in FIGS. 1-2 and 1-3, the low-stage compression unit 12L includes a low-stage cylinder 121L, and the high-stage compression unit 12H includes a high-stage cylinder 121H.

  The low-stage cylinder 121L and the high-stage cylinder 121H are respectively formed with low-stage and high-stage cylinder bores 123L and 123H concentrically with the motor 11. In each of the cylinder bores 123L and 123H, cylindrical low-stage and high-stage pistons 125L and 125H having an outer diameter smaller than the bore diameter are respectively disposed. The cylinder bores 123L and 123H and the low-stage and high-stage pistons are respectively disposed. A compression space for compressing the refrigerant is formed between the stage side pistons 125L and 125H.

  The cylinders 121L and 121H are formed with grooves extending from the cylinder bores 123L and 123H in the radial direction over the entire cylinder height, and plate-like low-stage and high-stage vanes 127L and 127H are fitted in the grooves. ing. Low-stage and high-stage springs 129L and 129H are attached to the vanes 127L and 127H on the compressor housing 10 side.

  Due to the repulsive force of the springs 129L and 129H, the tips of the vanes 127L and 127H are pressed against the outer peripheral surfaces of the pistons 125L and 125H, and the vanes 127L and 127H make the compression space low and high suction chambers 131L and 131L, respectively. It is partitioned into 131H and low-stage and high-stage compression chambers 133L and 133H.

  The cylinder 121L and the cylinder 121H are provided with low-stage and high-stage suction holes 135L and 135H communicating with the suction chambers 131L and 131H in order to suck the refrigerant into the suction chambers 131L and 131H.

  Further, an intermediate partition plate 140 is installed between the low-stage cylinder 121L and the high-stage cylinder 121H to partition the compression space of the low-stage cylinder 121L and the compression space of the high-stage cylinder 121H. . A low-stage end plate 160L is installed below the low-stage cylinder 121L, and closes the compression space of the low-stage cylinder 121L. A high-stage end plate 160H is installed on the upper side of the high-stage cylinder 121H, and closes the upper part of the compression space of the high-stage cylinder 121H.

  A lower bearing portion 161L is formed on the lower stage end plate 160L, and a lower portion 151 of the shaft 15 is rotatably supported by the lower bearing portion 161L. Further, the upper stage end plate 160H is formed with an upper bearing portion 161H, and the intermediate portion 153 of the shaft 15 is fitted to the upper bearing portion 161H.

  The shaft 15 includes a low-stage crank portion 152L and a high-stage crank portion 152H that are offset by 180 ° from each other. The low-stage crank portion 152L is a low-stage side of the low-stage compression portion 12L. The piston 125L is rotatably held, and the high-stage crank portion 152H rotatably holds the high-stage piston 125H of the high-stage compression section 12H.

  When the shaft 15 rotates, the low-stage side and high-stage side pistons 125L and 125H rotate while rolling on the inner peripheral walls of the low-stage side and high-stage side cylinder bores 123L and 123H. The high stage vanes 127L and 127H reciprocate. Due to the movement of the low-stage and high-stage pistons 125L and 125H and the low-stage and high-stage vanes 127L and 127H, the low-stage and high-stage suction chambers 131L and 131H and the low-stage and high-stage compression chambers are moved. The volumes of 133L and 133H change continuously, and the compression unit 12 continuously sucks the refrigerant, compresses it, and discharges it.

  Below the low stage side end plate 160L, a low stage side muffler cover 170L is installed, and a low stage side muffler chamber 180L is formed between the low stage side end plate 160L. And the discharge part of the low stage side compression part 12L is opened to the low stage side muffler chamber 180L. That is, the low-stage end plate 160L is provided with a low-stage discharge hole 190L that connects the compression space of the low-stage cylinder 121L and the low-stage muffler chamber 180L. A low-stage discharge valve 200L is installed to prevent the reverse flow of the refrigerant.

  As shown in FIGS. 1-4 and 1-5, the low-stage muffler chamber 180L is one chamber communicated in an annular shape, and includes a discharge side of the low-stage compression section 12L and a high-stage compression section 12H. This is a part of an intermediate communication path that communicates with the suction side.

  Also, as shown in FIGS. 1-5 and 1-6, a low-stage discharge valve presser 201L for limiting the amount of flexure opening of the low-stage discharge valve 200L is placed on the low-stage discharge valve 200L. Is fixed by a rivet 203 together with the low-stage discharge valve 200L. In addition, a low-stage muffler discharge hole 210L that discharges the refrigerant in the low-stage muffler chamber 180L is provided on the outer peripheral wall portion of the low-stage end plate 160L. The low stage side muffler discharge hole 210L and the high stage side suction hole 135H are provided in the same circumferential direction.

  A high stage side muffler cover 170H is installed above the high stage side end plate 160H, and a high stage side muffler chamber 180H is formed between the high stage side end plate 160H. The high stage side end plate 160H is provided with a high stage side discharge hole 190H that communicates the compression space of the high stage side cylinder 121H and the high stage side muffler chamber 180H, and the high stage side discharge hole 190H is compressed. A high-stage discharge valve 200H that prevents the backflow of the refrigerant is installed. Further, on the high-stage discharge valve 200H, a high-stage discharge valve presser 201H is fixed with a rivet together with the high-stage discharge valve 200H in order to limit the deflection opening amount of the high-stage discharge valve 200H. ing.

  The low-stage cylinder 121L, the low-stage end plate 160L, the low-stage side muffler cover 170L, the high-stage cylinder 121H, the high-stage side end plate 160H, the high-stage side muffler cover 170H, and the intermediate partition plate 140 are formed by bolts not shown. It is fastened together. Of the compression part 12 integrally fastened by bolts, the outer peripheral part of the high-stage end plate 160H is fixed to the compressor casing 10 by spot welding, and the compression part 12 is fixed to the compressor casing 10. .

  As shown in FIG. 1-7, the first communication hole 101, the second communication hole 102, and the third communication hole 103 are formed in the outer peripheral wall of the cylindrical compressor housing 10 in order from the lower part in the axial direction. Is provided. The first communication hole 101, the second communication hole 102, and the third communication hole 103 are provided at the same circumferential position of the compressor housing 10.

  As shown in FIGS. 1-2 and 1-8, in order to avoid interference with the piping described later, the front surface of the outer portion of the compressor housing 10 (the first communication hole 101, the second communication hole 102, and the third An accumulator 25 made up of an independent cylindrical sealed container is held by an accumulator holder 251 and an accumulator band 253 at a circumferential position shifted in phase to the right from the circumferential position where the communication hole 103 is provided.

  A system connection pipe 255 connected to the refrigeration cycle side is connected to the center of the top of the accumulator 25, and one end of the bottom communication hole 257 provided at the center of the bottom of the accumulator 25 extends to the upper part inside the accumulator 25. The low-pressure connecting pipe 31 is connected to the other end of the low-stage suction pipe 104.

  One end of the low-stage side discharge pipe 105 is connected to the low-stage side muffler discharge hole 210L of the low-stage side muffler chamber 180L through the first communication hole 101, and the high-stage side suction hole 135H of the high-stage side cylinder 121H includes One end of the high-stage suction pipe 106 is connected through the third communication hole 103, and the other end of the low-stage discharge pipe 105 and the other end of the high-stage suction pipe 106 are two-dimensionally bent into a U shape. They are connected by an intermediate connecting pipe 23. In order to avoid interference with the U-shaped intermediate connecting pipe 23, the low-pressure connecting pipe 31 is bent three-dimensionally at right angles at two locations.

  The intermediate communication passage that connects the discharge side of the low-stage compression unit 12L and the suction side of the high-stage compression unit 12H includes a low-stage muffler chamber 180L, a low-stage muffler discharge hole 210L, an intermediate communication pipe 23, and a high-stage It is comprised by the suction hole 135H of the side compression part 12H. Further, an intermediate suction pipe 108 described later is connected to the U-shaped upper part (downstream side) of the intermediate communication pipe 23.

  Further, the temperature of the refrigerant discharged from the low-stage muffler chamber 180L on the upstream side of the portion where the intermediate suction pipe 108 of the intermediate connecting pipe 23 is connected, that is, on the outer surface near the low-stage compression section 12L. A temperature sensor 240 for measuring the temperature is attached.

  The discharge part of the high stage side compression part 12H communicates with the inside of the compressor housing 10 via the high stage side muffler chamber 180H. That is, the high-stage end plate 160H is provided with a high-stage discharge hole 190H that communicates the compression space of the high-stage cylinder 121H with the high-stage muffler chamber 180H. A high-stage discharge valve 200H is installed to prevent the reverse flow of the refrigerant. The discharge part of the high-stage muffler chamber 180H communicates with the compressor housing 10. A discharge pipe 107 that discharges high-pressure refrigerant to the refrigeration cycle side is connected to the top of the compressor housing 10.

  Lubricating oil is sealed in the compressor casing 10 up to the height of the high-stage cylinder 121H, and the lubricating oil circulates through the compression section 12 by a blade pump (not shown) inserted in the lower portion of the shaft 15. In addition, a portion that divides the compression space of the compressed refrigerant is sealed by lubrication of sliding parts and minute gaps.

  As shown in FIGS. 1-2 and 1-8, as a characteristic structure of the compressor 1 of the first embodiment, the distal end portion of the intermediate suction pipe 108 formed in an L shape is thicker than the intermediate suction pipe 108. It is inserted into the upper part of the intermediate connecting pipe 23 and connected (welded). The outlet at the tip of the intermediate suction pipe 108 is directed in the substantially same direction as the flow direction of the intermediate-pressure gas refrigerant in the intermediate communication pipe 23. Thereby, although it depends on conditions, the injection refrigerant having a flow velocity higher than that of the intermediate-pressure gas refrigerant can be ejected, and the ejector effect can be exhibited.

  That is, the injection refrigerant ejected from the intermediate suction pipe 108 sucks the intermediate-pressure gas refrigerant from the low-stage compression section 12L, and makes it easy to suck it into the high-stage compression section 12H. As a result, the pressure loss of the intermediate-pressure gas refrigerant can be reduced, the suction pressure of the high-stage compression unit 12H can be increased, and the efficiency of the compressor 1 can be improved.

  FIG. 1-9 illustrates a modification of the compressor 1 according to the first embodiment. In this modified example, the outlet at the tip of the intermediate suction pipe 108 inserted in the upper part of the intermediate connecting pipe 23 is cut obliquely parallel to the inner wall of the intermediate connecting pipe 23. Since the distal end portion of the intermediate suction pipe 108 inserted into the intermediate communication pipe 23 is cut off, the flow resistance of the intermediate pressure gas refrigerant is reduced, the pressure loss can be further reduced, and the efficiency of the compressor 1 is further improved. Can be made.

  FIG. 1-10 illustrates another modification of the compressor 1 according to the first embodiment. In this modification, the outlet of the tip of the intermediate suction pipe 108 formed in an L shape is inserted upward into the lower part of the intermediate communication pipe 23 to connect the intermediate suction pipe 108 and the intermediate communication pipe 23 (welding). To do. The outlet at the tip of the intermediate suction pipe 108 is directed in substantially the same direction as the flow direction of the intermediate-pressure gas refrigerant in the intermediate communication pipe 23 to exert the ejector effect. Even if it does in this way, the same effect as the above is acquired.

  FIG. 2 is a side view showing a second embodiment of the injection-compatible two-stage compression rotary compressor of the air conditioner according to the present invention. As a characteristic structure of the compressor 1B according to the second embodiment, a low-stage muffler discharge hole 210L (see FIG. 1-5) includes a low-stage suction hole 135L (see FIG. 1-3) of the compression unit 12 and a high stage. The side suction hole 135H is provided in the radial direction at a position where the circumferential phase of the compressor housing 10 is shifted to the left.

  As shown in FIG. 2, a first communication hole 101, a second communication hole 102, and a third communication hole 103 are provided on the outer peripheral wall of the cylindrical compressor housing 10 in order from the lower part in the axial direction. It has been. The second communication hole 102 and the third communication hole 103 are provided at the same circumferential position (front) of the compressor housing 10, and the first communication hole 101 is different from the second communication hole 102 and the third communication hole 103. Are provided at different circumferential positions (positions shifted to the left).

  The low-pressure communication pipe 31 that guides the low-pressure refrigerant of the refrigeration cycle to the low-stage compression unit 12L via the accumulator 25 is connected to the low-stage suction of the low-stage cylinder 121L via the second communication hole 102 and the low-stage intake pipe 104. It is connected to the hole 135L. In the low-pressure communication pipe 31, a portion between the low-stage side suction pipe 104 and the bottom communication hole 257 of the accumulator 25 is two-dimensionally bent into a 1/4 arc shape.

  One end of the low-stage side discharge pipe 105 is connected to the low-stage side muffler discharge hole 210L of the low-stage side muffler chamber 180L through the first communication hole 101, and the high-stage side suction hole 135H of the high-stage side cylinder 121H includes One end of the high-stage suction pipe 106 is connected through the third communication hole 103, and the other end of the low-stage discharge pipe 105 and the other end of the high-stage suction pipe 106 are two-dimensionally bent into a U shape. They are connected by an intermediate connecting pipe 23.

  The first communication hole 101 is provided at a different circumferential position (position shifted to the left side) from the second and third communication holes 102 and 103 so that the low-pressure communication pipe 31 and the intermediate communication pipe 23 do not interfere with each other. . The connection method between the intermediate suction pipe 108 and the intermediate communication pipe 23 is the same as that in the first embodiment (including modifications and other modifications).

  In the compressor 1B of the second embodiment, the low-pressure connecting pipe 31 can be bent two-dimensionally in an arc shape with one bent portion, and the low-pressure connecting pipe 31 can be easily processed to reduce the cost. Can do. Further, the pipe line resistance of the low-pressure communication pipe 31 can be reduced, the suction pressure loss can be reduced, and the compression efficiency of the compressor 1B can be improved.

  FIG. 3 is a side view showing a third embodiment of the injection-compatible two-stage compression rotary compressor according to the present invention. As a characteristic structure of the compressor 1C of the third embodiment, a low-stage side suction hole 135L (see FIG. 1-3) of the compression unit 12 includes a low-stage side muffler discharge hole 210L (see FIG. 1-5) and a high stage. The side suction hole 135H is provided in the radial direction at a position where the circumferential phase of the compressor housing 10 is shifted to the right.

  As shown in FIG. 3, a first communication hole 101, a second communication hole 102, and a third communication hole 103 are provided on the outer peripheral wall of the cylindrical compressor housing 10 in order from the lower part in the axial direction. It has been. The first communication hole 101 and the third communication hole 103 are provided at substantially the same circumferential position (front surface) of the compressor housing 10, and the second communication hole 102 includes a low-pressure communication pipe 31 and an intermediate communication pipe 23 described later. The first communication hole 101 and the third communication hole 103 are provided at different circumferential positions (positions shifted to the right side) so as not to interfere with each other.

  As shown in FIG. 3, the accumulator 25 formed of an independent cylindrical sealed container is located at a position shifted from the front side of the outer side of the compressor housing 10 to the right side (substantially the same circumferential position as the second communication hole 102). Are held by the accumulator holder 251 and the accumulator band 253. A system connection pipe 255 connected to the refrigeration cycle side is connected to the center of the top of the accumulator 25, and one end of the bottom communication hole 257 provided at the center of the bottom of the accumulator 25 extends to the upper part inside the accumulator 25. The low-pressure connecting pipe 31 is connected to the other end of the low-stage suction pipe 104.

  The low-pressure communication pipe 31 that guides the low-pressure refrigerant of the refrigeration cycle to the low-stage compression unit 12L via the accumulator 25 is connected to the low-stage suction of the low-stage cylinder 121L via the second communication hole 102 and the low-stage suction pipe 104. It is connected to the hole 135L. In the low-pressure communication pipe 31, a portion between the low-stage side suction pipe 104 and the bottom communication hole 257 of the accumulator 25 is two-dimensionally bent into a 1/4 arc shape.

  One end of the low-stage side discharge pipe 105 is connected to the low-stage side muffler discharge hole 210L of the low-stage side muffler chamber 180L through the first communication hole 101, and the high-stage side suction hole 135H of the high-stage side cylinder 121H includes One end of the high-stage suction pipe 106 is connected through the third communication hole 103, and the other end of the low-stage discharge pipe 105 and the other end of the high-stage suction pipe 106 are two-dimensionally bent into a U shape. They are connected by an intermediate connecting pipe 23. The second communication hole 102 is provided at a different circumferential position (position shifted to the right side) from the first and third communication holes 101 and 103 so that the low-pressure communication pipe 31 and the intermediate communication pipe 23 do not interfere with each other. .

  As described above, the rotary compressor 1 </ b> C according to the third embodiment has the first communication hole 101 and the third communication hole 103 of the compressor housing 10 at substantially the same circumferential position (front) of the compressor housing 10. The second communication hole 102 is arranged at a circumferential position (position shifted to the right side) different from the first and third communication holes 101 and 103 so that the low-pressure communication pipe 31 and the intermediate communication pipe 23 do not interfere with each other. It is arranged.

  Therefore, similarly to the second embodiment, the low-pressure connecting pipe 31 can be bent and formed into a U-shape two-dimensionally, and the low-pressure connecting pipe 31 can be easily processed to reduce the cost. be able to. Further, the pipe line resistance of the low-pressure communication pipe 31 can be reduced, the suction pressure loss can be reduced, and the compression efficiency of the compressor 1C can be improved.

  During high rotation operation by the motor 11 of variable speed type, that is, when the circulating refrigerant flow rate is large, the pressure loss in the low pressure communication pipe 31 becomes larger, so that the low pressure communication pipe 31 is bent as in the second and third embodiments. If the location is reduced to one location and pressure loss is reduced, the efficiency of the compressors 1B and 1C can be improved.

  As described above, the injection-compatible two-stage compression rotary compressor according to the present invention is useful for the refrigeration cycle of an air conditioner.

It is a figure which shows the basic composition of the refrigerating cycle of an air conditioner. It is a longitudinal cross-sectional view which shows Example 1 of the two-stage compression rotary compressor corresponding to the injection of the air conditioner concerning this invention. It is a cross-sectional view of the low stage side compression part and high stage side compression part of a two-stage compression rotary compressor. It is a cross-sectional view which follows the AA line of FIGS. 1-2. It is a cross-sectional view of a low stage side end plate. It is sectional drawing which follows the BB line of FIGS. 1-5. It is a front view of a compressor housing | casing. 1 is a side view of an injection-compatible two-stage compression rotary compressor of Example 1. FIG. It is a longitudinal cross-sectional view which shows the modification of the injection | emission 2 step | paragraph compression rotary compressor of Example 1. FIG. It is a longitudinal cross-sectional view which shows the other modification of the injection | emission 2 step | paragraph compression rotary compressor of Example 1. FIG. It is a side view which shows Example 2 of the two-stage compression rotary compressor corresponding to the injection of the air conditioner concerning this invention. It is a side view which shows Example 3 of the two-stage compression rotary compressor corresponding to the injection of the air conditioner concerning this invention.

Explanation of symbols

1, 1B, 1C Injection compatible two-stage compression rotary compressor (compressor)
2 Basic cycle piping 3 Four-way valve 4 Condenser (heat radiator)
5 Branch pipe 6 Injection pipe 7A 1st expansion mechanism part 7B 2nd expansion mechanism part 8 Internal heat exchanger 9 Evaporator (heat absorber)
DESCRIPTION OF SYMBOLS 10 Compressor housing | casing 11 Motor 12 Compression part 15 Shaft 23 Intermediate connection pipe 25 Accumulator 31 Low pressure connection pipe 101 1st communication hole 102 2nd communication hole 103 3rd communication hole 104 Low stage side suction pipe 105 Low stage side discharge pipe 106 High-stage suction pipe 107 Discharge pipe 108 Intermediate suction pipe 111 Stator 112 Rotor 12L Low-stage compression section 12H High-stage compression section 121L Low-stage cylinder 121H High-stage cylinder 123L Low-stage cylinder bore 123H High-stage cylinder bore 125L Low Stage piston 125H High stage piston 127L Low stage vane 127H High stage vane 129L Low stage spring 129H High stage spring 131L Low stage suction chamber 131H High stage suction chamber 133L Low stage compression chamber 133H High stage side Compression chamber 135L Low stage suction hole 135H Stage side suction hole 140 Middle partition plate 151 Lower 152L Low stage side crank part 152H High stage side crank part 153 Middle part 160L Low stage side end plate 160H High stage side end plate 161L Lower bearing part 161H Upper bearing part 170L Low stage side muffler Cover 170H High-stage muffler cover 180L Low-stage muffler chamber 180H High-stage muffler chamber 190L Low-stage discharge hole 190H High-stage discharge hole 200L Low-stage discharge valve 200H High-stage discharge valve 201L Low-stage discharge valve holder 201H High stage discharge valve holder 203 Rivet 210L Low stage muffler discharge hole 240 Temperature sensor 251 Accum holder 253 Accum band 255 System connection pipe 257 Bottom communication hole

Claims (4)

Used in heat pump systems using injection refrigeration cycles,
A cylindrical compressor housing that is provided with first, second, and third communication holes in order in an axially spaced manner on the outer peripheral wall, and is sealed;
One end of the low-stage suction pipe is installed in the compressor housing, connected to the low-stage suction hole through the second communication hole, and the low-stage discharge pipe is connected to the low-stage muffler discharge hole through the first communication hole. A lower stage compression section to which one end of the
Installed in the compressor housing near the lower stage compression section, one end of the higher stage suction pipe is connected to the higher stage suction hole through the third communication hole, and the higher stage muffler discharge hole is the compression section. A high-stage compression section communicating with the inside of the machine casing;
A motor for driving the low-stage compression section and the high-stage compression section;
A sealed cylindrical accumulator held on the outer side of the compressor housing;
A low-pressure communication pipe connecting the bottom communication hole of the accumulator and the other end of the low-stage suction pipe;
An intermediate connecting pipe connecting the other end of the lower stage discharge pipe and the other end of the higher stage suction pipe;
An intermediate suction pipe for guiding an intermediate pressure injection refrigerant that is a wet refrigerant on the injection refrigeration cycle side to the intermediate connecting pipe;
An injection-compatible two-stage compression rotary compressor comprising:
The intermediate suction pipe is connected to the intermediate communication pipe such that the outlet of the intermediate suction pipe faces the intermediate pressure gas refrigerant flow direction of the intermediate communication pipe;
Injection-compatible two-stage compression rotary compressor. Providing the second and third communication holes at substantially the same circumferential position of the cylindrical compressor housing;
The first through hole is provided at a circumferential position different from the second and third communication holes,
Holding the accumulator at approximately the same circumferential position as the second and third communication holes;
2. The injection-compatible two-stage compression rotary compressor according to claim 1, wherein the low-pressure connecting pipe and the intermediate connecting pipe, which are two-dimensionally bent, do not interfere with each other. Providing the first and third communication holes at substantially the same circumferential position of the cylindrical compressor housing;
The second communication hole is provided at a circumferential position different from the first and third communication holes, and the accumulator is held at substantially the same circumferential position as the second communication hole,
2. The injection-compatible two-stage compression rotary compressor according to claim 1, wherein the low-pressure connecting pipe and the intermediate connecting pipe, which are two-dimensionally bent, do not interfere with each other.   The injection-compatible two-stage compression rotary compressor according to any one of claims 1 to 3, wherein the rotation speed is variable.

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