WO2019111350A1

WO2019111350A1 - Compressor and refrigeration cycle device

Info

Publication number: WO2019111350A1
Application number: PCT/JP2017/043826
Authority: WO
Inventors: 公平櫻田
Original assignee: 三菱電機株式会社
Priority date: 2017-12-06
Filing date: 2017-12-06
Publication date: 2019-06-13
Also published as: JPWO2019111350A1; CN210197788U

Abstract

In order to provide a refrigeration cycle device and a compressor having an accumulator with which pressure loss in an inner pipe can be reduced, a compressor (100) comprises: a compression mechanism unit (3) having at least one cylinder (31); an accumulator (140) for separating a refrigerant into a gas and a liquid; an inner pipe (44) which is in the interior of a container (141) forming the accumulator, one end (45a) of the inner pipe opening inside the container and the other end (45b) connected to an opening provided in the container; and an intake pipe (5) connecting the accumulator and the compression mechanism unit, one end (51a) of the intake pipe connected to the inner pipe positioned in the opening, and the other end (51b) connected to an intake opening (42) of the cylinder. The intake pipe comprises: an accumulator connection section (5a) constituting a pipe connected to the inner pipe; a cylinder connection section (5c) constituting a pipe connected to the intake opening of the cylinder and having a smaller diameter than the accumulator connection section; and a tapered section (5b), which is a pipe one end of which is a larger-diameter end formed so as to be continuous with the accumulator connection section and the other end of which is a smaller-diameter end formed so as to be continuous with the cylinder connection section, wherein the diameter decreases continuously from the one end to the other end.

Description

Compressor and refrigeration cycle device

The present invention relates to a compressor having an accumulator and a refrigeration cycle apparatus provided with the compressor.

In the conventional compressor, an accumulator having the same number of suction pipes as the number of cylinders constituting the compressor is fixed adjacently, and the refrigerant is supplied from the accumulator to the compressor groove via the suction pipe ( For example, Patent Document 1).

JP 2012-57503

In the compressor, it is desirable that the diameter of the inner pipe in the accumulator be large in order to reduce pressure loss. However, the conventional rotary compressor having a cylinder connects with the suction pipe by limiting the size of the diameter of the suction pipe connecting the accumulator and the cylinder to the size of the diameter of the suction port of the cylinder The size of the outer diameter of the inner pipe is limited. Therefore, there is a limitation in reducing the pressure loss of the inner pipe.

The present invention is for solving the problems as described above, and provides a compressor having an accumulator capable of reducing the pressure loss of the inner pipe, and a refrigeration cycle apparatus.

In the compressor according to the present invention, one end is opened in the container and the other end is opened in the container that constitutes the accumulator, and the accumulator that separates the refrigerant into the gas and the liquid. A suction pipe connected to the inner pipe connected to the opening provided in the container and the inner pipe having one end located at the opening, the other end connected to the suction port of the cylinder, and connecting the accumulator and the compression mechanism And the suction pipe comprises an accumulator connection portion forming a pipe connected to the inner pipe, and a pipe connection connected to the suction port of the cylinder, and a cylinder connection portion having a diameter smaller than that of the accumulator connection portion; A tube having one end of a large diameter formed continuously with an accumulator connection and a small diameter formed continuously with a cylinder connection. Te, and has a, a tapered portion which is reduced in diameter continuously from one end to the other end.

In the compressor according to the present invention, the suction pipe comprises an accumulator connection portion forming a pipe connected to the inner pipe and a pipe connected to the suction port of the cylinder, and the cylinder connection having a diameter smaller than that of the accumulator connection portion Part. In addition, the suction pipe is a pipe having one end of a large diameter continuously formed with the accumulator connection portion and constituting the other end of a small diameter continuously formed with the cylinder connection portion, from one end to the other It has a tapered portion which is continuously reduced in diameter by being put on the end. Therefore, the compressor can be provided with an inner pipe having a pipe diameter larger than the diameter of the suction port of the cylinder in the accumulator, and the pressure loss of the inner pipe can be reduced.

1 is a schematic view showing a refrigeration cycle apparatus provided with a compressor according to Embodiment 1 of the present invention. It is a longitudinal cross-sectional view of the compressor concerning Embodiment 1 of the present invention. 1 is a perspective view of a suction pipe of a compressor according to Embodiment 1 of the present invention. It is a longitudinal cross-sectional view of the conventional compressor. It is a longitudinal cross-sectional view of the compressor concerning Embodiment 2 of this invention. It is a perspective view of the suction pipe of the compressor concerning Embodiment 2 of the present invention. It is a longitudinal cross-sectional view of the conventional compressor. It is a cross-sectional schematic diagram of the accumulator of the conventional compressor of FIG. It is a cross-sectional schematic diagram of the accumulator of the compressor of FIG.

Hereinafter, a compressor 100 according to an embodiment of the present invention and a refrigeration cycle apparatus 10 will be described with reference to the drawings and the like. In the following drawings including FIG. 1, the relative dimensional relationships, shapes, and the like of the respective constituent members may differ from the actual ones. Moreover, in the following drawings, what attached | subjected the same code | symbol is the same or it corresponds to this, and this shall be common in the whole text of a specification. In addition, terms that indicate direction (for example, "upper", "lower", "right", "left", "front", "rear", etc.) are appropriately used to facilitate understanding, but their notations are as follows: For the convenience of the description, it is only described as such, and does not limit the arrangement and orientation of the device or parts.

Embodiment 1
[Refrigeration cycle apparatus 10]
FIG. 1 is a schematic view showing a refrigeration cycle apparatus 10 provided with a compressor 100 according to Embodiment 1 of the present invention. The refrigeration cycle apparatus 10 includes a compressor 100, a condenser 110, an expansion device 120, and an evaporator 130. In the refrigeration cycle apparatus 10, as shown in FIG. 1, a compressor 100, a condenser 110, an expansion device 120, and an evaporator 130 are connected in series by a refrigerant pipe to constitute a refrigerant circulation circuit.

The compressor 100 is a rotary compressor, and compresses a low-pressure gas phase refrigerant introduced therein to change it into a high-temperature high-pressure gas phase refrigerant. The compressor 100 has an accumulator 140. The condenser 110 dissipates heat from the high temperature and high pressure gas phase refrigerant sent from the compressor 100, and changes the gas phase refrigerant into a high pressure liquid phase refrigerant. The expansion device 120 reduces the pressure of the high-pressure liquid-phase refrigerant fed from the condenser 110 and changes it to a low-temperature low-pressure liquid-phase refrigerant. The evaporator 130 vaporizes the liquid-phase refrigerant fed from the expansion device 120 and changes it to a low-pressure gas-phase refrigerant. At this time, the heat of vaporization is taken away by the phase-changing refrigerant, and the periphery of the evaporator 130 is cooled. The gas phase refrigerant deprived of the heat of vaporization is again introduced into the compressor 100 via the accumulator 140. As described above, in the refrigeration cycle apparatus 10, the refrigerant, which is the working fluid, circulates while undergoing phase change between the gas phase refrigerant and the liquid phase refrigerant. Heat is dissipated from the refrigerant in the process of phase change from gas phase refrigerant to liquid phase refrigerant, and is absorbed by the refrigerant in the process of phase change from liquid phase refrigerant to gas phase refrigerant. Heating or cooling is performed using these heat radiation or heat absorption.

[Compressor 100]
FIG. 2 is a longitudinal cross-sectional view of the compressor 100 according to Embodiment 1 of the present invention. In the compressor 100, the electric mechanism unit 2 and the compression mechanism unit 3 are accommodated inside the hermetic container 1. The compressor 100 also has an accumulator 140 outside the hermetic container 1 and a suction pipe 5 connecting the hermetic container 1 and the accumulator 140.

(Closed container 1)
The closed container 1 comprises a central container 11 having a cylindrical shape, a hemispherical upper container 12 for closing the upper opening of the central container 11, and a bottomed cylindrical lower container 13 for closing the lower opening of the central container 11. It is done. In the closed container 1, the upper container 12 is fitted in the upper opening of the central container 11, and the lower container 13 is fitted in the lower opening of the central container 11 to maintain a sealed state. A suction pipe 5 to which an accumulator 140 is attached is connected to the central container 11, and a discharge pipe 7 is connected to the upper container 12. The suction pipe 5 is a connection pipe for feeding the gas refrigerant (low temperature and low pressure) to be sucked through the accumulator 140 into the compression mechanism 3. The detailed configuration of the suction pipe 5 will be described later. The discharge pipe 7 is a connection pipe for discharging the gas refrigerant (high temperature and high pressure) in the closed container 1 compressed by the compression mechanism section 3 to the refrigerant pipe constituting the refrigeration cycle apparatus 10. On the inner wall side of the lower container 13, refrigeration oil supplied to the compression mechanism unit 3 via the inside of the main shaft 23 is stored. In the hermetic container 1 of the compressor 100, a space A is formed between the lower portion of the electric mechanism 2 and the upper portion of the compression mechanism 3.

(Electric mechanism 2)
The electric mechanism unit 2 is disposed at an upper portion in the closed container 1. The electric mechanism 2 includes a stator 21 fixed to the central container 11 and a rotor 22 rotatably fitted on the inner peripheral side of the stator 21. The stator 21 is fixed to the central container 11 of the closed container 1 by, for example, various fixing methods such as shrink fitting, welding and the like. At the central portion of the rotor 22, a main shaft 23 extending downward is fixed. The main shaft 23 is rotatably supported by the upper bearing 38 and the lower bearing 39 and rotates with the rotor 22.

(Compression mechanism 3)
The compression mechanism portion 3 is accommodated in the closed container 1 and compresses the refrigerant flowing into the closed container 1. The compression mechanism portion 3 is a rotary type compression mechanism having at least one cylindrical cylinder. The compression mechanism 3 is disposed below the motorized mechanism 2 and is fixed to the central container 11. The compression mechanism portion 3 includes a cylinder 31 having a substantially cylindrical shape, a piston 33, a vane 35, an upper bearing 38, a lower bearing 39, and an upper silencer 40.

The substantially cylindrical cylinder 31 is disposed such that the central axis is eccentric to the axis of the main shaft 23. The cylinder 31 is formed with a suction port 42 to which the suction pipe 5 described above is connected. In the upper part of the cylinder 31, a substantially cylindrical upper bearing 38 is disposed in contact with the upper end surface of the cylinder 31, and closes the upper end surface of the cylinder 31. At the lower part of the cylinder 31, a substantially cylindrical lower bearing 39 is disposed in contact with the lower end face of the cylinder 31, and closes the lower end face of the cylinder 31. The upper bearing 38 has a discharge port (not shown) through which the refrigerant compressed in the cylinder 31 passes.

The piston 33 is at a position eccentric to the central axis of the main shaft 23 and is fitted to the main shaft 23 so as to rotate with the main shaft 23. The piston 33 is fitted to the eccentric shaft of the main shaft 23 and eccentrically rotates in the cylinder 31. Further, a vane 35 is slidably in contact with the piston 33. An upper silencer 40 is provided on the upper bearing 38.

(Accumulator 140)
The accumulator 140 separates the refrigerant into a gas and a liquid so that the liquid refrigerant that can not be evaporated by the evaporator 130 is not compressed by the compressor 100, and allows the compressor 100 to absorb only the gas refrigerant. The accumulator 140 has a cylindrical container 141, a connection suction pipe 8 provided at the upper part of the container 141, and an inner pipe 44 disposed in the container 141. The connection suction pipe 8 is connected to the evaporator 130 constituting the refrigeration cycle apparatus 10 and guides the refrigerant into the accumulator 140. The inner pipe 44 is a cylindrical through pipe, and is disposed in the container 141 so as to extend in the vertical direction. In the inner pipe 44, one end 45a is disposed to face the connection suction pipe 8 in the container 141 constituting the accumulator 140, the inner pipe 44 is opened in the container 141, and the other end 45b is provided in the lower portion of the container 141. The suction pipe 5 is connected with the opening 141 a. The pipe diameter of the inner pipe 44 is smaller than the inner diameter of the container 141 and larger than the diameter of the suction port 42 of the cylinder 31.

[Intake pipe 5]
FIG. 3 is a perspective view of the suction pipe 5 of the compressor 100 according to Embodiment 1 of the present invention. The suction pipe 5 will be described with reference to FIGS. 2 and 3. The suction pipe 5 is a connection pipe for feeding the gas refrigerant flowing from the evaporator 130 of the refrigeration cycle apparatus 10 into the compression mechanism 3 via the accumulator 140. The suction pipe 5 is connected to the inner pipe 44 whose one end 51 a is located at the opening 141 a, and the other end 51 b is connected to the suction port 42 of the cylinder 31 to connect the accumulator 140 and the compression mechanism 3. The suction pipe 5 constitutes a cylindrical accumulator connection portion 5a constituting a pipe connected to the inner pipe 44 and a pipe connected to the suction port 42 of the cylinder 31, and is a cylinder smaller in diameter than the accumulator connection portion 5a. And a connection portion 5c. The suction pipe 5 also has a tapered portion 5b. The tapered portion 5b is a tube having one end 5b1 of large diameter continuously formed with the accumulator connection portion 5a and the other end 5b2 of small diameter continuously formed with the cylinder connection portion 5c. The diameter is continuously reduced from 5b1 to the other end 5b2. The size of the inner diameter of the accumulator connection 5 a is equal to the size of the inner diameter of the inner pipe 44. In addition, the case where the magnitude | sizes of an internal diameter are equal includes the case where it is completely equal, and the case where it is substantially equal. The tapered portion 5b is located between the accumulator connection portion 5a and the cylinder connection portion 5c, and the peripheral wall is continuously reduced in diameter from the accumulator connection portion 5a side to the cylinder connection portion 5c side. The cylinder connection portion 5 c is bent between the tapered portion 5 b and the suction port 42 of the cylinder 31. The cylinder connection portion 5c is a circular pipe, but is not limited to a circular pipe, and may be, for example, a flat pipe. The suction pipe 5 is separate from the inner pipe 44. Therefore, even if the number of cylinders 31 constituting the compression mechanism portion 3 increases or decreases, the compressor 100 and the accumulator 140 can be connected only by changing the suction pipe 5 in which the number of cylinder connection portions 5c formed is changed. As a result, regardless of the number of cylinders of the compression mechanism portion 3, the structure of the accumulator 140 in which the inner pipe 44 used for the compressor 100 is disposed can be unified.

[Operation of Compressor 100]
Next, the operation of the compressor 100 will be described using FIG. In the compressor 100, when the main shaft 23 is rotated by the drive of the electric mechanism 2, the piston 33 in the cylinder 31 is also rotated together with the main shaft 23. The piston 33 is eccentrically rotated, and the vane 35 slidably in contact with the piston 33 performs a piston movement by the rotation of the piston 33. At this time, the gas refrigerant enters the compression chamber surrounded by the inner wall of the cylinder 31, the piston 33 and the vanes 35 from the suction port 42 of the compression mechanism 3 via the suction pipe 5. The gas refrigerant in the compression chamber is compressed as the volume of the compression chamber decreases as the piston 33 rotates.

The gas refrigerant compressed in the compression chamber is discharged from the discharge port (not shown) provided in the upper bearing 38 into the internal space B of the upper silencer 40. The gas refrigerant discharged into the internal space B is discharged into the space A from a discharge port (not shown) provided in the upper silencer 40. The gas refrigerant circulating in the space A passes through the gas holes 22 a provided in the rotor 22 and the air gap 2 a between the stator 21 and the rotor 22 to reach the upper portion in the closed container 1, The discharge pipe 7 discharges the refrigerant into the refrigerant circuit of the refrigeration cycle apparatus 10.

The compressor 100 is configured as described above, and the refrigerant gas having passed through the condenser 110, the expansion device 120, and the evaporator 130 shown in FIG. 1 is returned from the connection suction pipe 8 to the accumulator 140. The refrigerant gas stored in the space C inside the accumulator 140 is discharged from the inner pipe 44 and is again supplied into the compressor 100 from the suction port 42 of the cylinder 31 through the suction pipe 5.

As described above, the compressor 100 includes the suction pipe 5 connected to the accumulator connection portion 5a constituting the pipe connected to the inner pipe 44 and the suction port 42 of the cylinder 31, and the accumulator connection portion 5a And a cylinder connection portion 5c of smaller diameter. In the compressor 100, the suction pipe 5 has a tapered portion 5b which is continuously reduced in diameter from one end 5b1 to the other end 5b2. Therefore, the compressor 100 can include the inner pipe 44 having a pipe diameter larger than the diameter of the suction port 42 of the cylinder 31 in the accumulator 140, and the pressure loss of the inner pipe 44 can be reduced. In the compressor 100, the tapered portion 5b of the suction pipe 5 is continuously reduced in diameter from one end 5b1 to the other end 5b2. Therefore, it is possible to suppress the disturbance of the refrigerant in the flow path which may occur due to the difference between the pipe diameter of the inner pipe 44 and the diameter of the suction port 42 of the cylinder 31.

In the compressor 100, the inner pipe 44 has a pipe diameter larger than the diameter of the suction port 42 of the cylinder 31. Therefore, the compressor 100 can reduce the pressure loss of the inner pipe 44.

Moreover, the refrigeration cycle apparatus 10 can obtain the refrigeration cycle apparatus 10 having the effects of the compressor 100 according to the first embodiment by including the compressor 100 according to the first embodiment.

FIG. 4 is a longitudinal sectional view of the conventional compressor 100A. The parts having the same configuration as that of the compressor 100 of FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof will be omitted. The conventional compressor 100A has a suction pipe 5A connecting the accumulator 140A and the cylinder 31. The diameter of the suction pipe 5A is limited with respect to the diameter of the suction port 42 of the cylinder 31. The inner diameter of the inner pipe 44A connected to the suction pipe 5A is substantially equal to the diameter of the suction port 42. Therefore, there is a limit to the reduction of the pressure loss of the inner pipe 44A. On the other hand, compressor 100 has accumulator connecting part 5a, taper part 5b, and cylinder connecting part 5c. Therefore, the inner pipe 44 having a pipe diameter larger than the diameter of the suction port 42 of the cylinder 31 can be provided in the accumulator 140, and the pressure loss of the inner pipe 44 can be reduced. In the compressor 100, the tapered portion 5b of the suction pipe 5 is continuously reduced in diameter from one end 5b1 to the other end 5b2. Therefore, it is possible to suppress the disturbance of the refrigerant in the flow path which may occur due to the difference between the pipe diameter of the inner pipe 44 and the diameter of the suction port 42 of the cylinder 31.

Second Embodiment
FIG. 5 is a longitudinal sectional view of a compressor 200 according to Embodiment 2 of the present invention. The parts having the same configuration as that of the compressor 100 of FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof will be omitted. The compressor 200 has a twin rotary type compression mechanism 3A and a suction pipe 50 connecting the compression mechanism 3A and the accumulator 140. While the compressor 100 according to the first embodiment is a single rotary compressor with one cylinder 31, the compressor 200 according to the second embodiment has two cylinders, an upper cylinder 31 A and a lower cylinder 32. It is a twin rotary compressor having Further, the compressor 200 according to the second embodiment differs from the structure of the suction pipe 5 of the compressor 100 according to the first embodiment in the structure of the suction pipe 50. In addition, the compressor 200 is corresponded to the compressor 100 which comprises the refrigerating-cycle apparatus 10 of FIG.

(Compression mechanism 3A)
The compression mechanism portion 3A is accommodated in the closed container 1 and compresses the refrigerant flowing into the closed container 1. The compression mechanism portion 3A is a rotary compression mechanism having two substantially cylindrical cylinders, an upper cylinder 31A and a lower cylinder 32. The compression mechanism portion 3A is disposed below the motorized mechanism portion 2 and is fixed to the central container 11. The compression mechanism 3A further includes an upper piston 33A, a lower piston 34, an upper vane 35A, a lower vane 36, an upper bearing 38, a lower bearing 39, a partition plate 37, an upper silencer 40, and a lower A silencer 41 is provided.

The central axis of the substantially cylindrical upper cylinder 31A and the substantially cylindrical lower cylinder 32 are arranged eccentrically with respect to the axial center of the main shaft 23. An upper suction port 42A to which the upper cylinder connection portion 50d of the suction pipe 50 is connected is formed in the upper cylinder 31A. Further, the lower cylinder 32 is formed with a lower suction port 43 to which the lower cylinder connection portion 50 c of the suction pipe 50 is connected. At the upper part of the upper cylinder 31A, a substantially cylindrical upper bearing 38 is disposed in contact with the upper end face of the upper cylinder 31A, and closes the upper end face of the upper cylinder 31A. At the lower part of the lower cylinder 32, a substantially cylindrical lower bearing 39 is disposed in contact with the lower end face of the lower cylinder 32 and closes the lower end face of the lower cylinder 32. A discharge port (not shown) is formed in each of the upper bearing 38 and the lower bearing 39. Further, in the upper cylinder 31A and the lower cylinder 32, gas holes (not shown) communicating the inside of the upper cylinder 31A and the lower cylinder 32 are formed.

The upper piston 33A and the lower piston 34 are eccentrically located with respect to the central axis of the main shaft 23, and are fitted to the main shaft 23 so as to rotate together with the main shaft 23. The upper piston 33A is fitted to the eccentric shaft of the main shaft 23, and eccentrically rotates in the upper cylinder 31A. The lower piston 34 is fitted to the eccentric shaft of the main shaft 23 and eccentrically rotates in the lower cylinder 32. An upper vane 35A and a lower vane 36 are in sliding contact with the upper piston 33A and the lower piston 34, respectively. The partition plate 37 closes the lower end surface of the upper cylinder 31A and the upper end surface of the lower cylinder 32. An upper silencer 40 is provided to the upper bearing 38, and a lower silencer 41 is provided to the lower bearing 39.

[Accumulator 140]
The accumulator 140 separates the refrigerant into a gas and a liquid so that the liquid refrigerant that can not be evaporated by the evaporator 130 is not compressed by the compressor 200, and allows the compressor 200 to absorb only the gas refrigerant. The accumulator 140 has a cylindrical container 141, a connection suction pipe 8 provided at the upper part of the container 141, and an inner pipe 44 disposed in the container 141. The connection suction pipe 8 is connected to the evaporator 130 constituting the refrigeration cycle apparatus 10 and guides the refrigerant into the accumulator 140. The inner pipe 44 is a cylindrical through pipe, and is disposed in the container 141 so as to extend in the vertical direction. In the inner pipe 44, one end 45a is disposed to face the connection suction pipe 8 in the container 141 constituting the accumulator 140, the inner pipe 44 is opened in the container 141, and the other end 45b is provided in the lower portion of the container 141. The suction pipe 50 is connected with the opening 141 a. The pipe diameter of the inner pipe 44 is smaller than the inner diameter of the container 141 and larger than the diameters of the upper suction port 42A and the lower suction port 43 of the upper cylinder 31A.

[Intake pipe 50]
FIG. 6 is a perspective view of a suction pipe 50 of a compressor 200 according to Embodiment 2 of the present invention. The suction pipe 50 will be described with reference to FIGS. 5 and 6. The suction pipe 50 is a connection pipe for feeding the gas refrigerant flowing from the evaporator 130 of the refrigeration cycle apparatus 10 into the compression mechanism 3 via the accumulator 140. The suction pipe 50 is connected to the inner pipe 44 whose one end 51a is located at the opening 141a, one other end 51b is connected to the upper suction port 42A of the upper cylinder 31A, and the other other end 51b is a lower cylinder It is connected to the lower suction port 43 of 32. Then, the suction pipe 50 connects the accumulator 140 and the compression mechanism unit 3. The suction pipe 50 constitutes a cylindrical accumulator connection portion 50a constituting a pipe connected to the inner pipe 44 and a pipe connected to the lower suction port 43 of the lower cylinder 32, and has a diameter smaller than that of the accumulator connection portion 50a. Lower cylinder connection portion 50c. The suction pipe 50 also has a tapered portion 50b. The tapered portion 50b is a tube having one end 50b1 of a large diameter continuously formed with the accumulator connection portion 50a and the other end 50b2 of a small diameter continuously formed with the lower cylinder connection portion 50c. The tapered portion 50b is continuously reduced in diameter from one end 50b1 to the other end 50b2. Further, the suction pipe 50 has an upper cylinder connection portion 50d which constitutes a circular pipe which protrudes from the peripheral wall constituting the accumulator connection portion 50a and is connected to the upper suction port 42A of the upper cylinder 31A. The lower cylinder connection portion 50c corresponds to the "cylinder connection portion" in the present invention, and the upper cylinder connection portion 50d corresponds to the "upper cylinder connection portion" in the present invention.

The size of the inner diameter of the accumulator connection 50 a is equal to the size of the inner diameter of the inner pipe 44. In addition, the case where the magnitude | sizes of an internal diameter are equal includes the case where it is completely equal, and the case where it is substantially equal. The tapered portion 50b is located between the accumulator connection portion 50a and the lower cylinder connection portion 50c, and the peripheral wall is continuously reduced in diameter from the accumulator connection portion 50a side to the lower cylinder connection portion 50c side. The lower cylinder connection portion 50 c is bent between the tapered portion 50 b and the lower suction port 43 of the lower cylinder 32. Although the lower cylinder connection part 50c and the upper cylinder connection part 50d are circular pipes, they are not limited to circular pipes, and may be flat pipes. The lower cylinder connection portion 50c and the upper cylinder connection portion 50d are disposed in parallel. In addition, the suction pipe 50 is not limited to what the lower cylinder connection part 50c and the upper cylinder connection part 50d are arrange | positioned in parallel, for example, the extension direction of each pipe | tube is formed in a different direction It is also good.

The pipe diameter of the lower cylinder connection portion 50c is smaller than the pipe diameter of the upper cylinder connection portion 50d. This is to equalize the pressure of the refrigerant flowing into the upper cylinder 31A and the lower cylinder 32 via the lower cylinder connection portion 50c and the upper cylinder connection portion 50d. More specifically, the lower cylinder connection portion 50c is positioned in the flow direction of the refrigerant flowing through the inner pipe 44, whereas the upper cylinder connection portion 50d is positioned to branch laterally from the flow direction of the refrigerant. . If the lower cylinder connection portion 50c and the upper cylinder connection portion 50d have the same diameter, the lower cylinder is positioned in the flow direction of the refrigerant flowing through the inner pipe 44 rather than the upper cylinder connection portion 50d branched to the side. A large pressure is applied to the connection 50c. Therefore, by equalizing the pressure of the refrigerant flowing through the lower cylinder connection portion 50c and the upper cylinder connection portion 50d, the pipe diameter is reduced by the tapered portion 50b and the flow rate of the refrigerant flowing through the lower cylinder connection portion 50c is adjusted. I am trying.

The suction pipe 50 is separate from the inner pipe 44. Therefore, even if the number of cylinders constituting the compression mechanism portion 3A increases or decreases, the compressor 200 and the accumulator 140 can be connected only by changing the suction pipe 50 in which the number of cylinder connection portions formed is changed. As a result, regardless of the number of cylinders of the compression mechanism 3A, the structure of the accumulator 140 in which the inner pipe 44 used for the compressor 200 is disposed can be unified.

FIG. 7 is a longitudinal sectional view of a conventional compressor 200A. Parts having the same configurations as those of the compressor 100 and the compressor 200 in FIGS. 1 to 5 are denoted by the same reference numerals, and the description thereof will be omitted. In the conventional compressor 200A having two cylinders, two inner pipes 44B equal in number to the number of cylinders are disposed in the accumulator 140B adjacently fixed. The conventional compressor 200A includes two suction pipes, and includes an upper suction pipe 60B connecting the accumulator 140B and the upper cylinder 31A, and a lower suction pipe 60A connecting the accumulator 140B and the lower cylinder 32. . In the conventional compressor 200A, the size of the diameter of the upper suction pipe 60B is limited with respect to the size of the diameter of the upper suction port 42A of the upper cylinder 31A. In the compressor 200A, the size of the diameter of the lower suction pipe 60A is restricted with respect to the size of the diameter of the lower suction port 43 of the lower cylinder 32. The inner diameter of the inner pipe 44B connected to the upper suction pipe 60B is substantially equal to the diameter of the upper suction port 42A. Further, the size of the inner diameter of the inner pipe 44B connected to the lower suction pipe 60A is substantially equal to the size of the diameter of the lower suction port 43. Therefore, there is a limit to the reduction of the pressure loss of each inner pipe 44B. On the other hand, the compressor 200 has an accumulator connection portion 50a, a taper portion 50b, a lower cylinder connection portion 50c, and an upper cylinder connection portion 50d. Therefore, the inner pipe 44 having a pipe diameter larger than the diameters of the upper suction port 42A of the upper cylinder 31A and the lower suction port 43 of the lower cylinder 32 can be provided in the accumulator 140, and the pressure loss of the inner pipe 44 is reduced. be able to. In the compressor 200, the tapered portion 50b of the suction pipe 50 is continuously reduced in diameter from one end 50b1 to the other end 50b2. Therefore, it is possible to suppress the disturbance of the refrigerant in the flow path which may occur due to the difference between the pipe diameter of the inner pipe 44 and the diameter of the suction port 42 of the cylinder 31.

FIG. 8 is a schematic cross-sectional view of an accumulator 140B of the conventional compressor 200A of FIG. The conventional compressor 200A has the following relationship between the inner pipe 44B and the container 141B of the accumulator 140B. The outer diameter of the inner pipe 44B is defined as Y '. The inner diameter of the container 141B of the accumulator 140B is Z, the distance between the outer peripheral wall of the inner pipe 44B in the arrangement direction of the inner pipe 44B and the inner peripheral wall of the container 141B of the accumulator 140B is X, the outer peripheral walls of the inner pipe 44B Let W be the distance between them. At this time, the outer diameter Y 'of the inner pipe 44B can be expressed as Y' = {Z- (W + 2X)} / 2. Since the dimensions of W and X are limited in manufacture, the outer diameter Y 'of the inner pipe 44B is limited with respect to the inner diameter Z of the accumulator 140B.

FIG. 9 is a schematic cross-sectional view of the accumulator 140 of the compressor 200 of FIG. In the compressor 200 according to the second embodiment, one inner pipe 44 is disposed in the accumulator 140 fixed adjacently. The compressor 200 has the following relationship between the inner pipe 44 and the container 141 of the accumulator 140. The outer diameter of the inner pipe 44 is Y, the inner diameter of the container 141 of the accumulator 140 is Z, and the distance between the outer peripheral wall of the inner pipe 44 and the inner peripheral wall of the container 141 of the accumulator 140 is X. At this time, the outer diameter Y of the inner pipe 44 can be expressed as Y = Z-2X. Here, when the conventional compressor 200A and the compressor 200 according to the second embodiment are compared, the outer diameter Y ′ of the inner pipe 44B = {Z− (W + 2X)} / 2 compared to the outer diameter Y ′ = {Z− (W + 2X)} / 2. Outer diameter Y = Z-2X. That is, the relationship between the outer diameter Y 'of the inner pipe 44B and the outer diameter Y of the inner pipe 44 is 2Y' <Y. Therefore, in the compressor 200, the outer diameter Y of the inner pipe 44 connected to the accumulator 140 can be provided as large as possible with respect to the inner diameter Z of the accumulator 140, as compared with the conventional compressor 200A. As a result, the compressor 200 can reduce the pressure loss of the inner pipe 44 more than the inner pipe 44B of the conventional compressor 200A.

[Operation of Compressor 200]
Next, the operation of the compressor 200 will be described. In the compressor 200, when the main shaft 23 is rotated by the drive of the electric mechanism 2, the upper piston 33A in the upper cylinder 31A and the lower piston 34 in the lower cylinder 32 are also rotated together with the main shaft 23. The upper piston 33A rotates eccentrically, and the upper vane 35A slidably in contact with the upper piston 33A performs a piston movement by the rotation of the upper piston 33A. Similarly, the lower piston 34 rotates eccentrically, and the lower vane 36 slidably in contact with the lower piston 34 performs a piston motion by the rotation of the lower piston 34. At this time, the gas refrigerant enters the compression chamber surrounded by the inner wall of the upper cylinder 31A, the upper piston 33A and the upper vane 35A from the upper suction port 42A of the compression mechanism 3A through the upper cylinder connection portion 50d of the suction pipe 50 . Further, the gas refrigerant enters the compression chamber surrounded by the inner wall of the lower cylinder 32, the lower piston 34 and the lower vane 36 from the lower suction port 43 of the compression mechanism 3A via the lower cylinder connection portion 50c of the suction pipe 50. The gas refrigerant in the compression chamber is compressed as the volume in the compression chamber decreases as the upper piston 33A and the lower piston 34 rotate.

The gas refrigerant compressed in the compression chamber is discharged from the discharge ports (not shown) respectively provided in the upper bearing 38 and the lower bearing 39 via grooves communicating the inside of the upper cylinder 31A and the inside of the lower cylinder 32. It is discharged to the internal space of the upper silencer 40 and the lower silencer 41. The gas refrigerant discharged into the internal space of the lower muffler 41 has gas holes (not shown) passing through the lower bearing 39, the lower cylinder 32, the partition plate 37, the upper cylinder 31A, and the upper bearing 38. It is led to the internal space B of the upper silencer 40 through it. The gas refrigerant discharged into the internal space B is discharged into the space A from a discharge port (not shown) provided in the upper silencer 40. The gas refrigerant circulating in the space A passes through the gas holes 22a provided in the rotor 22, the air gap 2a between the stator 21 and the rotor 22, and reaches the upper part in the closed container 1, and the discharge pipe 7 are discharged into the refrigerant circuit of the refrigeration cycle apparatus 10.

The compressor 200 is configured as described above, and the refrigerant gas having passed through the condenser 110, the expansion device 120, and the evaporator 130 shown in FIG. 1 is returned from the connection suction pipe 8 to the accumulator 140. The refrigerant gas stored in the space C inside the accumulator 140 is discharged from the inner pipe 44 and is again supplied into the compressor 200 from the upper suction port 42A and the lower suction port 43 through the suction pipe 50.

As described above, in the compressor 200, the suction pipe 50 has the accumulator connection portion 50a, the tapered portion 50b, the lower cylinder connection portion 50c, and the upper cylinder connection portion 50d. Therefore, the compressor 200 can include the inner pipe 44 having a pipe diameter larger than the diameter of the upper suction port 42A of the upper cylinder 31A and the lower suction port 43 of the lower cylinder 32 in the accumulator 140. As a result, the compressor 200 can reduce the pressure loss of the inner pipe 44. In the compressor 200, the tapered portion 50b of the suction pipe 50 is continuously reduced in diameter from one end 50b1 to the other end 50b2. Therefore, it is possible to suppress the disturbance of the refrigerant in the flow path which may occur due to the difference between the pipe diameter of the inner pipe 44 and the diameters of the upper suction port 42A of the upper cylinder 31A and the lower suction port 43 of the lower cylinder 32.

Moreover, as for the compressor 200, the pipe diameter of the lower cylinder connection part 50c is smaller than the pipe diameter of the upper cylinder connection part 50d. Therefore, the compressor 200 can balance the pressure of the refrigerant flowing through the lower cylinder connection portion 50c and the upper cylinder connection portion 50d.

In the compressor 200, the inner pipe 44 has a pipe diameter larger than the bores of the upper suction port 42A of the upper cylinder 31A and the lower suction port 43 of the lower cylinder 32. Therefore, the compressor 200 can reduce the pressure loss of the inner pipe 44.

Moreover, as for the compressor 200, the lower cylinder connection part 50c and the upper cylinder connection part 50d are arrange | positioned in parallel. Therefore, the compressor 200 can balance the pressure of the refrigerant flowing through the lower cylinder connection portion 50c and the upper cylinder connection portion 50d. In addition, the space required to accommodate the suction pipe 50 can be reduced, and hence the space required for storing and transporting the suction pipe 50 can be reduced.

Moreover, the refrigeration cycle apparatus 10 can obtain the refrigeration cycle apparatus 10 having the effects of the compressor 200 according to the second embodiment by including the compressor 200 according to the second embodiment.

The embodiment of the present invention is not limited to the above-described

Embodiments

1 and 2, and various modifications can be made. For example, although the compressor 100 and the compressor 200 are rotary compressors, as long as they use the accumulator 140, they may be scroll compressors or other compressors.

DESCRIPTION OF SYMBOLS 1 sealed container, 2 electric mechanism part, 2a air gap, 3 compression mechanism part, 3A compression mechanism part, 5 suction pipe, 5A suction pipe, 5a accumulator connection part, 5b taper part, 5b1 one end, 5b2 other end, 5c cylinder connection Part, 7 discharge pipe, 8 connection suction pipe, 10 refrigeration cycle device, 11 central container, 12 upper container, 13 lower container, 21 stator, 22 rotor, 22a gas hole, 23 main shaft, 31 cylinder, 31A upper cylinder, 32 lower cylinder, 33 piston, 33A upper piston, 34 lower piston, 35 vane, 35A upper vane, 36 lower vane, 37 partition plate, 38 upper bearing, 39 lower bearing, 40 upper silencer, 41 lower silencer, 42 suction Mouth, 42A upper suction port, 43 lower suction , 44 inner pipe, 44A inner pipe, 44B inner pipe, 45a one end, 45b other end, 50 suction pipe, 50a accumulator connection, 50b taper part, 50b1 one end, 50b2 other end, 50c lower cylinder connection, 50d upper cylinder connection Part, 51a one end, 51b the other end, 60A lower suction pipe, 60B upper suction pipe, 100 compressor, 100A compressor, 110 condenser, 120 expansion device, 130 evaporator, 140 accumulator, 140A accumulator, 140B accumulator, 141 container , 141B container, 141a opening, 200 compressor, 200A compressor.

Claims

A compression mechanism having at least one cylinder;
An accumulator that separates the refrigerant into a gas and a liquid;
In a container constituting the accumulator, an inner pipe having one end opened in the container and the other end connected to an opening provided in the container;
A suction pipe connected at one end to the inner pipe located at the opening and connected at the other end to a suction port of the cylinder to connect the accumulator and the compression mechanism portion;
Equipped with
The suction pipe is
An accumulator connection that constitutes a pipe connected to the inner pipe;
Forming a pipe connected to the suction port of the cylinder, and a cylinder connection smaller in diameter than the accumulator connection;
A pipe having one end of a large diameter continuously formed with the accumulator connection portion and constituting the other end of a small diameter continuously formed with the cylinder connection portion, from the one end to the other end A tapered portion which is continuously reduced in diameter,
With a compressor.
The compressor according to claim 1, wherein the inner pipe has a pipe diameter larger than a diameter of the suction port of the cylinder.
The compression mechanism has an upper cylinder and a lower cylinder,
The suction pipe is
It further comprises an upper cylinder connection projecting from the peripheral wall constituting the accumulator connection and connected to the suction port of the upper cylinder,
The compressor according to claim 1, wherein the cylinder connection portion is connected to a suction port of the lower cylinder.
The compressor according to claim 3, wherein a pipe diameter of the cylinder connection portion is smaller than a pipe diameter of the upper cylinder connection portion.
The compressor according to claim 3 or 4, wherein the cylinder connection portion and the upper cylinder connection portion are disposed in parallel.
A compressor according to any one of claims 1 to 5, a condenser connected to the compressor, an expansion device connected to the condenser, and a space between the expansion device and the compressor. And a connected evaporator.