JP2006177226A - Rotary compressor and air conditioner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve assembling work efficiency of a device such as piping while reducing an occupied area of a rotary two-stage compressor. <P>SOLUTION: The rotary two-stage compressor is provided with a rotary compression element having a low pressure compression element and a high pressure compression element, and an intermediate passage connected to a compression chamber of the low pressure compression element and a compression chamber of the high pressure compression element and separated from the internal space of a sealed container. The outer peripheral side lower part of the sealed container is provided with three legs almost uniformly in the circumferential direction. An accumulator connected to a suction port of the low pressure compression element, the intermediate passage, and injection piping connected to the intermediate passage are provided between the adjacent legs provided at the sealed container, and installed such that the outer periphery of the accumulator is closer to the leg than that of the injection piping. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air conditioner equipped with a refrigeration cycle and a rotary compressor used therefor.

  Conventionally, as a rotary two-stage compressor used in a refrigeration cycle, for example, a structure disclosed in Japanese Patent Application Laid-Open No. 60-128990 (hereinafter referred to as Patent Document 1) is known. The compressor in this prior art is provided with an electric motor composed of a stator and a rotor at the upper part inside a sealed container. The rotating shaft connected to the electric motor has two eccentric portions. As a compression mechanism corresponding to these eccentric portions, a high-pressure compression element and a low-pressure compression element are provided inside the sealed container in order from the electric motor side.

  Each compression element revolves the roller by the eccentric rotation of the eccentric portion of the rotation shaft. The eccentric portions have a phase difference of 180 °, and the phase difference of the compression process of each compression element is 180 °. That is, the compression process of the two compression elements is in antiphase.

  The gas refrigerant that is the working fluid passes through an accumulator that prevents the refrigerant from returning at low pressure Ps, is sucked into the compression element for low pressure, is compressed, and rises to an intermediate pressure Pm. The gas refrigerant discharged at the intermediate pressure Pm is discharged into the intermediate flow path. Next, the gas refrigerant having the intermediate pressure Pm is sucked into the high pressure compression element through the intermediate flow path and compressed to the high pressure Pd.

  The high-pressure Pd gas refrigerant discharged from the compressor is condensed by the condenser and then decompressed to the low pressure Ps by the expansion mechanism. After that, it evaporates in an evaporator to become a gas refrigerant and is sucked into the low pressure compression element.

  As a structure of such a rotary two-stage compressor, for example, a structure disclosed in Patent Document 1 is known. In this conventional rotary two-stage compressor, the shape of the intermediate flow path is not mentioned, and the upstream and downstream sides of the intermediate flow path are installed in opposite directions with respect to the rotation center of the rotation shaft. Is shown.

  Further, as a rotary two-stage compressor used in a gas injection cycle, for example, a structure shown in JP-A-5-106575 (hereinafter referred to as Patent Document 2) is known. An injection pipe communicating the gas / liquid separator of the gas injection cycle and the intermediate flow path is connected to the intermediate flow path.

JP-A-60-128990 (page 5, FIG. 1)

JP-A-5-106575 (page 6, FIG. 8)

  The rotary two-stage compressor used in the injection cycle described in the prior art is a complicated pipe including an accumulator, a suction pipe located downstream thereof, an intermediate flow path, and an injection pipe. Therefore, the external dimension of the rotary two-stage compressor is increased, and there is a problem that an occupied area is increased when the compressor is transported and stored alone or when it is installed in an air conditioner.

  Further, when assembling the rotary two-stage compressor, there is a problem that it is difficult to weld the intermediate flow path and the injection pipe due to complicated piping.

  Furthermore, when assembling the rotary two-stage compressor to the air conditioner, in addition to connecting the low-pressure Ps-side or high-pressure Pd-side cycle pipe and the rotary two-stage compressor, the gas-liquid separator and the injection pipe are connected. In addition, there is a problem that welding workability is difficult because of complicated piping.

  In order to achieve the above object, a rotary compressor according to the present invention comprises a motor in a sealed container, a rotary shaft driven by the motor and having two eccentric parts, and a compression for low pressure compressed by eccentric rotation of the eccentric part. A rotary compression element provided with an element and a compression element for high pressure, an intermediate flow path separated from an internal space of the sealed container connected to a compression chamber of the compression element for low pressure and a compression chamber of the compression element for high pressure An accumulator connected to the compression element for low pressure, an intermediate flow path disposed outside the sealed container, and An injection pipe that is provided in the middle of the intermediate flow path arranged on the outside and is connected to the injection pipe is provided between the adjacent legs, and the distance between the injection pipe and one leg of the adjacent legs Ri, towards the distance between the other leg of the accumulator and the adjacent leg is shortened.

  Further, the injection pipe may have a substantially L shape having a long pipe portion and a short pipe portion, and an end portion of the short pipe portion may be connected to the intermediate flow path. Moreover, you may equip the short pipe part with the temperature sensor or temperature sensor fixing member for injection cycle control.

  As an outdoor unit of an air conditioner, the rotary two-stage compressor according to the present invention, a heat exchanger provided at one end thereof with a connection part for piping for constituting a cycle, and a gas-liquid separator are provided. As seen from above the air conditioner, the accumulator was arranged closer to the connection part of the heat exchanger than the injection pipe and the gas-liquid separator. By providing such a configuration, the workability of assembling to the air conditioner is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the assembly workability | operativity of an apparatus is improved, reducing the occupation area of a compressor.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of the rotary two-stage compressor 1 of the present embodiment, FIG. 2 is a top view of the arrow A, and FIG. 3 is a side view of the arrow B.

  The compressor 1 includes a sealed container 13 including a bottom portion 21, a lid portion 12, and a body portion 22. An electric motor 14 having a stator 7 and a rotor 8 is provided above the inside of the sealed container 13. The rotating shaft 2 connected to the electric motor 14 includes two eccentric portions 5 and is pivotally supported by the main bearing 9 and the auxiliary bearing 19a.

  A main bearing 9 provided with an end plate portion 9a, a cylindrical cylinder 10b, an intermediate partition plate 15, a cylindrical cylinder 10a, an end plate portion 19b, and a sub-bearing 19a in order from the motor 14 side with respect to the rotating shaft 2. The provided intermediate container 19 is laminated and integrated with a fastening element 36 such as a bolt.

  The end plate portion 9 a is fixed to the inner wall of the body portion 22 by welding and supports the main bearing 9. The end plate portion 19b is supported by the auxiliary bearing 19a. In the present embodiment, the end plate portion 19b is fixed by the fastening element 36, but may be fixed to the body portion 22 by welding.

  Each compression element 20a and 20b is configured as shown in FIG. That is, in the low pressure compression element 20a, the compression chamber 23a is configured by the end plate portion 19b, the cylindrical cylinder 10a, the cylindrical roller 11a fitted to the outer periphery of the eccentric portion 5a, and the intermediate partition plate 15. .

  In the high-pressure compression element 20b, a compression chamber 23b is constituted by the main bearing 9, the cylindrical cylinder 10b, the cylindrical roller 11b fitted to the outer periphery of the eccentric portion 5b, and the intermediate partition plate 15.

  These compression chambers 23a and 23b contact the outer periphery of the rollers 11a and 11b in which a flat vane 18 connected to an urging force applying means such as a coil spring rotates in accordance with the eccentric motion of the eccentric portions 5a and 5b. While moving forward and backward, the compression chambers 23a and 23b are divided into a compression space and a suction space.

  The compression element 20 drives the roller 11 when the eccentric part 5 rotates eccentrically. As shown in FIG. 1, the eccentric portion 5a and the eccentric portion 5b have a phase difference of 180 °, and the phase difference in the compression process of the compression elements 20a and 20b is 180 °. That is, the compression process of the two compression elements is in opposite phase.

  The flow of the gas refrigerant which is a working fluid is represented by an arrow in FIG. The low-pressure Ps gas refrigerant supplied through the pipe 31 flows down the accumulator 61 for preventing liquid return, and is sucked into the low-pressure compression element 20a from the suction port 25a connected to the suction pipe 67 downstream of the accumulator 61. Is done.

  The sucked refrigerant is compressed to an intermediate pressure Pm when the roller 11a rotates eccentrically. When the refrigerant gas pressure in the compression chamber 23a reaches a preset pressure (intermediate pressure Pm), the discharge valve 28a that opens is opened, and the gas refrigerant having the intermediate pressure Pm communicates with the discharge port 26a. Discharged.

  The discharge space 33 is a space separated from the sealed space 29 in the sealed container 13 by the intermediate container 19 and the flat cover 35, and the internal pressure thereof is basically the intermediate pressure Pm. The intermediate flow path 30 is a flow path that connects the discharge port 26c from the discharge space 33 and the suction port 25b.

  The gas refrigerant having the pressure Pm discharged from the discharge port 26a opened by the discharge valve 28a is discharged into the discharge space 33, and then passes through the intermediate flow path 30 and communicates with the pressure chamber 23b of the high-pressure element 20b. To.

  Next, the gas refrigerant having the intermediate pressure Pm passing through the intermediate flow path 30 and sucked into the high pressure compression element 20b from the suction port 25b is compressed to the high pressure Pd by the revolution of the roller 11b. When the discharge valve 28b that opens when the pressure in the compression chamber 23b reaches a preset pressure opens at high pressure Pd, the gas refrigerant is discharged from the discharge port 26b to the sealed space 29 that is the internal space of the sealed container 13. The high-pressure Pd gas refrigerant discharged into the sealed space 29 passes through the gap of the electric motor 14 and is discharged from the discharge pipe 27.

  The piping structure around the intermediate flow path 30 will be described with reference to FIGS. 1 to 3. The suction pipe 67 and the intermediate flow path 30 are welded and joined to a circular insertion pipe 64 that has been welded to the body portion 22 in advance. As shown in FIG. 1, the intermediate flow path 30 has a substantially U shape in which a part of a copper tube is bent by 180 °.

  The suction pipe 67 is formed by bending two portions of the copper pipe into an L shape so as not to interfere with the intermediate flow path 30. That is, the inlet portion and the outlet portion of the suction pipe 67 have a twisted positional relationship. By these processes, the inlet and outlet of the intermediate flow path 30 and the outlet of the suction pipe 67 were installed in a line along the longitudinal direction of the trunk portion 22. That is, two closed vessel penetration portions on the low pressure compression element 20a side and the high pressure compression element 20b side of the intermediate flow path 30 arranged outside the closed vessel, and a closed vessel penetration portion of the pipe connected to the accumulator 61, Are in a row.

  The accumulator 61 is an iron container whose upper and lower cylinders are hemispherical, and is long in the longitudinal direction of the body portion 22. The accumulator 61 was disposed on the right side of the intermediate flow path 30 as shown by an arrow B (FIG. 3) in FIG.

  As shown in FIGS. 1 and 3, a hole was provided in the lower wall surface of the intermediate flow path 30, the injection pipe 17 was inserted, and the circumferential direction was welded. The injection pipe 17 includes a long pipe portion 65 and a short pipe portion 66, and is formed by bending a copper pipe.

  The opening side of the long pipe portion 65 was expanded for pipe connection. A cylindrical heat-sensitive tube 62 made of copper was provided on the outer wall of the short tube portion 66 along the longitudinal direction of the short tube portion 66. The thermosensitive tube 62 may be a temperature sensor fixing member in which a temperature sensor (not shown) on a cylinder for injection cycle control is inserted. The heat sensitive tube 62 reduces the temperature detection error due to the mounting error by increasing the contact area with the temperature sensor.

  The short pipe portion 66 that is a connection port of the injection pipe 17 is connected to the bent portion of the intermediate flow path 30 below the intermediate flow path 30 and above the center line of the discharge port 26c. At this time, the long pipe portion 65 was parallel to the longitudinal direction of the trunk portion 22, and the short pipe portion 66 was horizontal. The intermediate flow path 30, the injection pipe 17, and the heat sensitive pipe 62 are integrated by welding. The welding position of the short pipe portion 66 and the intermediate flow path 30 is set so that the welding material around the short pipe section 66 already joined by heat conduction is not softened when the intermediate flow path 30 and the insertion pipe 64 are welded. It is to do.

  As shown in FIG. 2, the rotary two-stage compressor 1 includes three legs 63 for installation in an air conditioner or the like. The legs 63 are formed by pressing an iron member and are fixed to the lower portion of the body 22 by welding. The legs 63 are arranged at an equal 120 ° pitch in the circumferential direction with respect to the center of the trunk portion 22.

  The accumulator 61, the suction pipe 67, the intermediate flow path 30, and the injection pipe 17 are arranged only in one section (section c in FIG. 2) between a predetermined leg and the leg, and there is no pipe connection in the other two sections. Further, as shown in FIG. 2, the outer periphery of the accumulator 61 is installed in the vicinity of the leg 63 in the section c, and the interval between the outer periphery of the injection pipe 17 and the leg 63 is increased. That is, the angle θ2 is set larger than the angle θ1.

  As shown in FIG. 2, the accumulator 61 and the pipe portion are concentrated in one section c of the adjacent legs 63 and the legs 63, and the other two sections are free spaces. Therefore, as shown in FIG. 4, a large number of rotary two-stage compressors 1 can be densely arranged as in storage or transportation. That is, the other two accumulators 61 and the like (section c) can be arranged close to a free space other than the section c of a certain rotary two-stage compressor 1, and the entire occupied area can be reduced.

  At this time, since the long pipe portion 55 of the injection pipe 17 is set in the vertical direction and the short pipe portion 56 is set in the horizontal direction, the arrangement pitch circle between the compressors can be reduced, and the occupied area can be reduced. That is, there is no interference between the accumulator 63 and the injection pipe 17, and the compressors can be arranged densely.

  Further, since the accumulator 61 is close to the one leg 63 in the section c, the workability of welding of the rotary two-stage compressor 1 is improved. That is, when welding the connecting pipe 64, the intermediate flow path 30, and the suction pipe 67, the other leg 63 in the section c is less obstructed and the welding operation can be performed from the direction shown by the broken line in FIG. The fact that the short pipe portion 66 side of the injection pipe 17 is connected to the intermediate flow path 30 also contributes to the expansion of the work space.

  Further, when the rotary two-stage compressor 1 is operated, vibration is easily amplified due to the gravity of the accumulator 61 having a large mass. However, since the accumulator 61 is disposed in the vicinity of the leg 63, there is an advantage that vibration amplification is suppressed.

  Next, the air conditioner using the compressor 1 of this embodiment is demonstrated using figures. The block diagram of the air conditioner of this embodiment is shown in FIG.

  The high-pressure Pd refrigerant gas discharged from the compressor 1 is condensed by the condenser 3 and then expanded by the first expansion mechanism 4 to reduce the pressure to the intermediate pressure Pm. The decompressed refrigerant gas is separated into a gas refrigerant and a liquid refrigerant by the gas-liquid separator 6. The separated liquid refrigerant is further depressurized to a low pressure Ps by the second expansion mechanism 4 downstream of the gas-liquid separator 6 and then evaporated by the evaporator 16 to become a gas refrigerant.

  The low-pressure Ps gas refrigerant is sucked into the low-pressure compression element 20a from the suction port 25a via the pipe 31, the accumulator 61, and the suction pipe 67, and the roller 11a fitted to the eccentric part 5a revolves to the intermediate pressure Pm. Compressed and discharged to the intermediate flow path 30.

  The gas refrigerant in the intermediate flow path 30 is mixed with the gas refrigerant having an intermediate pressure Pm supplied from the gas-liquid separator 6 and guided from the injection pipe 17 communicating with the intermediate flow path 30. Thereafter, the gas refrigerant having the intermediate pressure Pm sucked into the high pressure compression element 20b from the suction port 25b is compressed to the high pressure Pd by the revolution of the roller 11b fitted to the eccentric portion 5b, and discharged from the discharge pipe 27. Is done.

  In such an injection cycle, the gas refrigerant having low heat transfer performance is bypassed to the intermediate flow path 30 in the evaporator 16, so that the excessive circulation flow to the low pressure compression element 20 a is reduced to reduce the compression work, and the refrigeration Improve cycle performance coefficient COP. Further, a two-way valve 34 for opening and closing the flow path 17 is provided upstream of the injection pipe 17, and when the two-way valve 34 is opened, an injection cycle is established, and when the two-way valve 34 is closed, the ordinary refrigeration cycle shown in FIG. It is good also as a structure which can be switched. Instead of the two-way valve 34, an electromagnetic expansion valve capable of adjusting the flow rate may be used.

  The injection pipe 17 is provided with a temperature sensor 68 in order to control the flow rate of the gas refrigerant flowing down the injection pipe with the valve opening degree of the expansion mechanism 4. The temperature sensor 68 has a cylindrical shape and is inserted inside the thermal tube 62. However, the temperature sensor 62 may be directly attached to the short pipe portion 66.

  In FIG. 6, the structure of the outdoor unit of this embodiment is shown. FIG. 6 also shows the position of the worker during assembly work and the direction of movement when the outdoor unit is moved on a mass production line such as a belt conveyor.

  The outdoor unit is formed on a substrate 69 formed by pressing an iron plate, a heat exchanger 70 serving as a condenser 3 during cooling operation and an evaporator 16 during heating operation, a blower 72 driven by a blower motor 71, The compressor cover 73 that shields the compressor 1 and the air path, the rotary two-stage compressor 1 of the present embodiment, the substantially cylindrical gas-liquid separator 6, and the temperature sensor 68 are sequentially installed and configured. The heat exchanger 70 is substantially L-shaped as shown in FIG. However, the heat exchanger 70 may have a substantially U shape in which the long side of the L shape is further bent.

  The heat exchanger 70 includes a heat transfer tube 74 obtained by processing the inner surface of a copper tube, and a flat plate fin formed by pressing an aluminum material, and includes a connection portion 76 connected to a cycle pipe communicating with the compressor 1 and the like. . Here, the heat transfer tubes 74 are arranged in one row in the vertical direction, but may be two or more rows.

  Since the compressor cover 73 is formed by bending an iron plate, the compressor cover 73 has a substantially square shape or a substantially arc shape in order to reduce the air path loss of the blower system.

  The compressor 1 is installed in such a direction that the accumulator 61 is closer to the connecting portion 76 than the intermediate flow path 30, the injection pipe 17, and the gas-liquid separator 17. As shown in FIG. 6, the compressor 1 has the section c including the accumulator 61 and the like as the open side of the compressor cover 73, and the other two sections face each surface of the compressor cover 73. Therefore, the area occupied by the compressor 1 can be reduced and the area occupied by the outdoor unit can be reduced as in the case shown in FIG.

  The gas-liquid separator 6 was installed farther from the connecting portion 76 than the accumulator 61 and the intermediate flow path 30. As shown in FIG. 7, the gas-liquid separator 6 is disposed in a space above the short pipe portion 66 of the injection pipe 17 with the longitudinal direction thereof being the vertical direction (see FIG. 3).

  Since the short pipe portion 66 of the injection pipe 17 is installed below the intermediate flow path 30, a space can be secured on the side surface side of the intermediate flow path 30, and the above-described gas-liquid separator 6 can be disposed. Therefore, the space occupied by the outdoor unit is effectively utilized to reduce the area occupied by the gas-liquid separator 6 and the compressor 1.

  In the compressor 1, the position of the accumulator 61 is arranged on the connection part 76 side of the heat exchanger 70, so that the injection pipe 17 and the gas-liquid separator 6 are arranged close to the operator. Therefore, the compressor cover 73 and the heat exchanger 70 do not become obstacles, and the assembly workability of the temperature sensor 68 and the gas-liquid separator 6 is improved. The assembling direction of the temperature sensor 68 and the gas-liquid separator 6 is indicated by arrows in FIG.

  Similarly, at the time of welding between the pipe communicating with the gas-liquid separator 6 and the injection pipe 17, since the joint portion is in the vicinity of the operator, the compressor cover 73, the heat exchanger 70, the accumulator 61, and the intermediate flow path 30 are obstructed. However, welding workability is improved. This weld location is indicated by a broken line in FIGS.

  Further, since the heat sensitive tube 62 is provided in the short pipe portion 66 of the injection pipe 17, heat is hardly transmitted to the heat sensitive pipe 62 when the injection pipe 17 and the gas-liquid separator 6 are welded. Therefore, the existing welding location of the short tube part 66 and the heat sensitive tube 62 and the temperature sensor 68 can be protected from heat.

  With this configuration, in this embodiment, assembly and welding workability are improved while reducing the area occupied by the compressor and gas-liquid separator in the outdoor unit.

The longitudinal cross-sectional view of the rotary 2 stage compressor which shows one Embodiment of this invention. The arrow view of the A direction of FIG. The arrow view of the B direction of FIG. The layout of a rotary 2 stage compressor which shows one embodiment of the present invention. The block diagram of the refrigerating cycle which shows one Embodiment of this invention. The block diagram of the outdoor unit which shows one Embodiment of this invention. The perspective view of the outdoor unit which shows one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Compressor, 4 ... Expansion mechanism, 6 ... Gas-liquid separator, 17 ... Injection piping, 20 ... Compression element, 22 ... Body part, 30 ... Intermediate flow path, 61 ... Accumulator, 62 ... Thermal tube, 68 ... Temperature Sensor, 70 ... heat exchanger.

Claims (5)

  A rotary compression element provided with an electric motor in a hermetic container, a rotary shaft driven by the electric motor and having two eccentric parts, a low pressure compression element and a high pressure compression element that are compressed by eccentric rotation of the eccentric part; An intermediate flow path connected to the compression chamber of the compression element for low pressure and the compression chamber of the compression element for high pressure and separated from the internal space of the sealed container, and a part of which is disposed outside the sealed container; An accumulator connected to the compression element for low pressure, an intermediate flow path arranged outside the sealed container, and an outer side of the sealed container. An injection pipe that is provided in the middle of the arranged intermediate flow path and connected to the injection pipe is provided between the adjacent legs, and the distance between the injection pipe and one leg of the adjacent legs, Serial accumulator and a short rotary 2-stage compressor towards the distance between the other leg of the adjacent leg.   2. The rotary two-stage compressor according to claim 1, wherein the injection pipe is substantially L-shaped including a long pipe portion and a short pipe portion, and an end portion of the short pipe portion is connected to the intermediate flow path. Compressor.   The rotary two-stage compressor according to claim 2, wherein a temperature sensor or a temperature sensor fixing member is provided in a short pipe portion of the injection pipe.   2. The rotary two-stage compressor according to claim 1, wherein two closed container penetrating portions on the low pressure compression element side and the high pressure compression element side of the intermediate flow path disposed outside the closed container and the accumulator are provided. A rotary two-stage compressor in which the sealed container penetration part of the pipe to be connected is arranged in a line. In an air conditioner provided with an outdoor unit, a rotary two-stage compressor, a heat exchanger provided with a connection part with a cycle pipe, and a gas-liquid separator communicating with the injection pipe,
The rotary two-stage compressor includes an electric motor in a hermetically sealed container, a rotating shaft driven by the electric motor and having two eccentric portions, a low pressure compression element and a high pressure compression element that are compressed by eccentric rotation of the eccentric portion. A rotary compression element provided; an intermediate flow path separated from the internal space of the sealed container connected to the compression chamber of the low pressure compression element and the compression chamber of the high pressure compression element; An accumulator connected to the compression element for low pressure, the intermediate flow path, and an injection pipe connected to the intermediate flow path between adjacent legs. The distance between the accumulator and the other leg that defines the section is shorter than the distance between the injection pipe and one leg that defines the section, and is viewed from above the air conditioner. The Njekushon air conditioner, characterized in that the accumulator than piping and the gas-liquid separator is disposed to be adjacent to the connecting portion of the heat exchanger.

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