JP2015218674A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive scroll compressor in which a release valve can be freely arranged, and in which retainer specification does not increase.SOLUTION: A scroll compressor includes: a sealed container for accommodating a fixed scroll and a revolving scroll; a working fluid passage for connecting an inlet of the fixed scroll and an outlet of the fixed scroll; a compression chamber formed in the working fluid passage by the fixed scroll and the revolving scroll being engaged; and a plurality of release valve devices arranged in the fixed scroll, the plurality of release valve devices opening the passage for communicating the working fluid passage and a discharge pressure chamber when a pressure of the working fluid passage is increased higher than a setting pressure. The release valve device includes: a release flow passage for communicating the compression chamber and the discharge pressure chamber; a release valve for opening/closing the release flow passage; and a valve pressing body arranged above the release valve and imparting an elastic pressing force to the release valve. A retainer for restricting a movement range of the valve pressing body has a plurality of gas passages, and the number is larger than the number of the release valve devices.

Description

  The present invention relates to a scroll compressor.

  In recent years, scroll compressors for room air conditioners have been required to save energy and increase APF, and have been designed to have a low design volume ratio in order to improve the performance of intermediate conditions of cooling and heating. Similarly, the scroll compressor for water heaters is designed to have a low design volume ratio for high APF for general areas, but for cold districts, maximum capacity is ensured for high APF and cryogenic conditions. Therefore, it is necessary to design a high design volume ratio. Thus, scroll compressors have various design volume ratios according to product specifications.

  In addition, the scroll compressor needs an over-compression preventing device for the purpose of improving efficiency and ensuring reliability. For example, Patent Document 1 discloses a scroll compressor including a release valve device as an overcompression preventing device. The release valve device includes a release valve disposed in the release flow path, a valve pressing body, and a retainer disposed on the upper surface of the fixed scroll. The retainer has a plate shape and is formed by pressing or milling a steel plate. In the scroll compressor with a release valve device, when the pressure in the compression chamber becomes equal to or higher than the discharge pressure in the middle of the refrigerant compression process, the pressurized gas or liquid refrigerant is released by opening the release valve of the release valve device. It is the structure discharged | emitted from a discharge pressure chamber.

  In addition, when a scroll compressor is used under conditions where the dryness on the compressor suction side such as R32 refrigerant is low, liquid refrigerant flows into the compressor in a short time, so a release valve is added to the suction port of the fixed scrur and is reliable. The sex is secured.

JP 2013-241847 A

  However, in Patent Document 1, by adding a release valve, a retainer for a steel plate member, which is a constituent member of the release valve, will be newly produced. There is no cost increase associated with the occurrence of mold costs, and there is no compatibility with conventional retainers. There was a problem that required a retainer that matched the design volume ratios for room air conditioners and water heaters.

  Therefore, an object of the present invention is to provide an inexpensive scroll compressor in which a release valve can be arranged freely and the retainer specification does not increase.

  In order to achieve the above object, a scroll compressor according to the present invention includes a sealed container that houses a fixed scroll and a turning scroll, a working fluid inlet formed in the fixed scroll, and a working fluid formed in the fixed scroll. A spiral working fluid passage formed in the fixed scroll to connect the discharge port, a compression chamber formed in the working fluid passage by meshing the fixed scroll and the orbiting scroll, and the discharge port A discharge pressure chamber provided in the hermetic container so as to communicate with the compression chamber via the fixed scroll and the fixed scroll, and when the pressure of the working fluid passage rises higher than a set pressure, the working fluid passage And a plurality of release valve devices that open the passage so as to communicate with the discharge pressure chamber, the release valve device comprising the compression chamber and the discharge pressure chamber. A release passage that passes therethrough, a release valve that opens and closes the release passage, a valve pressing body that is disposed above the release valve and applies elastic pressing force to the release valve, and a movement range of the valve pressing body is limited. And a retainer screw for fastening the retainer to the fixed scroll, and the retainer has a plurality of gas passages more than the number of the release valve devices.

  According to the present invention, it is an object to provide an inexpensive scroll compressor in which a release valve can be arranged freely and the retainer specification does not increase.

1 is a longitudinal sectional view of a scroll compressor according to Embodiment 1. FIG. The top view of the fixed scroll of the scroll compressor of FIG. Sectional drawing of the release valve apparatus corresponding to the VV cross section of FIG. The top view of the fixed scroll of the scroll compressor of Example 2. FIG. FIG. 9 is a plan view of a fixed scroll of the scroll compressor according to the third embodiment. The top view of the fixed scroll of the scroll compressor of Example 4. FIG.

  Embodiments of the present invention will be described with reference to the drawings.

  1 is a longitudinal sectional view of a scroll compressor according to a first embodiment of the present invention, and FIG. 2 is a plan view of a fixed scroll of the scroll compressor of FIG.

  As shown in FIGS. 1 and 2, the scroll compressor 100 of this embodiment includes a compression mechanism 101 and an electric motor 102 in the chamber 1. The compression mechanism 101 includes a fixed scroll 2, a turning scroll 3, a frame 4, a crankshaft 5, and an Oldham ring 6 as main components. A suction pipe 7 connected to an external cycle is press-fitted into the suction port 23 of the fixed scroll 2. The electric motor unit 102 includes a stator 8 and a rotor 9. The stator 8 is fixed to the chamber 1 by shrink fitting or the like, and the rotor 9 is fitted to the crankshaft 5 by press fitting or the like. An outer peripheral portion of the frame 4 is fixed to the chamber 1 and includes a main bearing 4 a that receives rotation of the crankshaft 5. The main bearing 4a is a slide bearing. An orbiting scroll 3 is rotatably attached to an eccentric part of the crankshaft 5, and an Oldham ring 6 is provided in an Oldham ring groove 3 a provided in the orbiting scroll 3 and an Oldham ring groove 4 b provided in the frame 4. It is slidably mounted and prevents rotation while allowing the orbiting scroll 3 to revolve. The fixed scroll 2 that meshes with the orbiting scroll 3 to form a compression chamber is fastened to the frame 4 by bolts 10. A shaft end portion of the crankshaft 5 opposite to the eccentric portion is held by the auxiliary bearing 11a. The auxiliary bearing 11a is fixed to the auxiliary case 11 by press fitting or the like, and the auxiliary case is attached to the partition plate 12 fixed to the chamber 1 by welding or the like.

  The general operation of such a compressor will be described. The rotor 9 receives the rotational force from the stator 8 and rotates, and the crankshaft 5 fitted to the rotor 9 also rotates. The orbiting scroll 3 rotates eccentrically (revolves) without rotating due to the rotation of the crankshaft 5 and the action of the Oldham ring 6. Due to the revolution of the orbiting scroll 3, the low-pressure refrigerant gas sucked from the suction port of the fixed scroll 2 through the suction pipe 7 is gradually compressed in the compression chamber and becomes high pressure, and is discharged into the chamber 1 from the discharge hole 2a. The discharged high-pressure refrigerant gas passes through a gas flow groove (not shown) provided on the outer periphery of the fixed scroll 2 and a gas flow groove (not shown) provided on the outer periphery of the frame 4, and passes through the gas flow groove (not shown) of the motor unit 102. The stator 8 is reached. The refrigerant that has reached the stator 8 cools the stator 8 through a stator outer peripheral groove (not shown). At this time, most of the lubricating oil contained in the refrigerant is separated and is located below the motor unit 102 and in the chamber 1. Drop near the bottom. Reference numeral 16 in FIG. 1 indicates lubricating oil accumulated on the bottom surface of the chamber. Since it is a horizontal compressor, the inner surface of the chamber 1 facing the side surface of the crankshaft 5 is the bottom (lower side in FIG. 1), and the lubricating oil that lubricates each sliding portion is stored here. The refrigerant gas that has passed through the stator 8 is throttled by a gas flow path 12 a provided on the upper side of the partition plate 12, passes through a lubricating oil storage space (oil storage chamber) 17 on the right side of the partition plate 12, and is discharged from the discharge pipe 14. It is discharged from the refrigerant outlet. This refrigerant discharge port is formed in the lubricating oil storage space.

  Next, the supply of lubricating oil to the shaft and bearing will be described. A hole 5a is penetrated in the axial direction of the crankshaft 5, and a radial hole 5b communicating with the hole 5a is provided in a portion where the crankshaft 5 is supported by the main bearing 4a. Similarly, 5c is provided in the portion received by the sub bearing 11a.

  An oil supply pipe opening 15a which is an oil supply port of the oil supply pipe 15 is disposed in the oil storage chamber 17, and an opening is provided so as to face the bottom of the chamber 1 (the lower side in FIG. 1). It is provided in the position near. The lubricating oil 16 stored in the oil storage chamber 17 passes through the oil storage portion inlet 18a to the oil storage portion 18 constituted by the oil supply pipe 15 and the oil supply cover 13 attached to the sub case 11 by welding or the like. Refueled. The lubricating oil 16 supplied to the oil reservoir 18 passes through the hole 5a of the crankshaft 5, and is supplied from the hole 5c to the auxiliary bearing 11a and from the hole 5b to the main bearing 4a. Furthermore, the lubricating oil reaches the end surface of the crankshaft 5 through the hole 5a, and is supplied to the slewing bearing 3b therefrom. Therefore, the oil reservoir 18 during operation is filled with the lubricating oil 16. The driving force of this lubricating oil flow is the differential pressure between the high pressure in the oil storage chamber 16 and the intermediate pressure in the back pressure chamber 19. The back pressure chamber 19 is a space sandwiched between the orbiting scroll 3 and the frame 4. The pressure in the back pressure chamber 19 (referred to as back pressure) is controlled to a pressure intermediate between the discharge pressure and the suction pressure by a back pressure control valve (not shown), and the orbiting scroll 3 is pressed against the fixed scroll 2 by the back pressure. It has been.

  The fixed scroll 2 is provided with a plurality of release valve devices 22. The reason for providing the release valve device 22 is to discharge the working fluid from the compression chamber to the space in the chamber 1 when the pressure in the compression chamber becomes larger than the set pressure.

  Next, the positional relationship between the retainer 20 and the release valve device 22 of this embodiment will be described with reference to FIG. FIG. 3 is a cross-sectional view of the release valve device corresponding to the VV cross section of FIG.

  As shown in FIG. 3, the release valve device 22 includes a release valve 22a, a coil spring-like biasing member 22b, and a punch hole 22c so as to cover the release hole 2b provided in the fixed scroll 2. The movement of the guide member 22d is restricted by the retainer 20. The retainer 20 is provided with a gas passage 20 a through which the working fluid discharged from the release flow path 2 b passes, and is fixed to the fixed scroll 2 by a retainer screw 21.

  In this embodiment, as shown in FIG. 2, since the retainer 20 is manufactured from a crimped wire mesh or a welded wire mesh using iron or stainless steel, a polygon (in FIG. 2, a quadrangular shape) is formed over the entire surface. Gas passage 20a is provided.

  Since such a retainer 20 is used, a corresponding gas passage 20 a can be prepared regardless of the position of the release valve device 22 on the fixed scroll 2. Further, since the gas passage 20a is made larger than the shaft diameter of the retainer screw 21, the retainer screw 21 penetrating the arbitrary gas passage 20a is used by the retainer screw 21 regardless of the position of the fixed scroll 2 where the fixing hole of the retainer screw 21 is located. Can be fixed.

  As described above, in this embodiment, the common retainer 20 can be used for a plurality of types of scroll compressors in which the gas passage 20a is provided over the entire surface of the retainer 20 and the positions of the release valve devices 22 are different.

  In addition, since the retainer 20 has a simple configuration using a crimp wire mesh or a weld wire mesh, it is not necessary to use a mold for producing the retainer 20, and the manufacturing cost can be reduced.

  Further, when the area of the release flow path is A and the gas passage area of the retainer is B, the relationship of A <B is reduced, thereby reducing the flow resistance of the working fluid discharged from the compression chamber to the space in the chamber 1. Compressor efficiency and reliability are improved.

  According to the present embodiment, the release valve device 22 can be arranged freely, and an inexpensive scroll compressor that does not increase the retainer specification can be provided.

  In the present embodiment, the configuration in which the gas passages 20a are provided over the entire surface of the retainer 20 has been described. However, by providing more gas passages 20a than the number of release valve devices 22, a plurality of scroll compressions are provided. The retainer 20 can be shared by the machine.

  Next, the scroll compressor of Example 2 is demonstrated using FIG. The description of the configuration common to the first embodiment is omitted.

  In Example 1, the retainer 20 was produced using a crimped wire mesh or a welded wire mesh, but the retainer 20 of this example was produced by press forming a steel plate. Also in this embodiment, the common retainer 20 can be used for a plurality of types of scroll compressors in which the gas passage 20a is provided over the entire surface of the retainer 20 and the positions of the release valve devices 22 are different.

  Next, the scroll compressor of Example 3 is demonstrated using FIG. Note that the description of the configuration common to the second embodiment is omitted.

  In the second embodiment, the gas passage 20a has a polygonal shape, but in this embodiment, the gas passage 20a has a substantially circular shape. Also in this embodiment, the common retainer 20 can be used for a plurality of types of scroll compressors in which the gas passage 20a is provided over the entire surface of the retainer 20 and the positions of the release valve devices 22 are different.

  By making the gas passage 20a circular like the retainer 20 of the present embodiment, the processing becomes easier than the polygonal gas passage 20a shown in Embodiment 2, and the plate composite strength of the retainer 20 is improved. be able to.

  Next, the scroll compressor of Example 4 is demonstrated using FIG. The description of the configuration common to the other embodiments is omitted.

  As shown in FIG. 6, the release valve device 22 can be additionally provided by providing a plurality of bolt fastening surfaces 20 b protruding from the outer peripheral surface of the retainer 20.

DESCRIPTION OF SYMBOLS 1 Chamber 2 Fixed scroll 2a Discharge hole 3 Orbiting scroll 3a Oldham ring groove 3b Orbiting bearing 4 Frame 4a Main bearing 4b Oldham ring groove 5 Crankshaft 5a Axial through hole 5b Main shaft radial through hole 5c Sub axial radial through hole 6 Oldham ring 7 Suction pipe 8 Stator 9 Rotor 10 Bolt 11 Sub case 11a Sub bearing 12 Partition plate 12a Gas passage 13 Oil supply cover 14 Discharge pipe 15 Oil supply pipe 15a Oil supply pipe opening 16 Lubricating oil 17 Oil storage chamber 18 Oil storage Portion 18a Oil reservoir inlet 19 Back pressure chamber 20 Retainer 20a Gas passage 20b Bolt fastening surface 21 Retainer screw 22 Release valve device 22a Release valve 22b Energizing member 22c Drain hole 22d Guide member

Claims (5)

A sealed container for storing the fixed scroll and the orbiting scroll;
A spiral working fluid passage formed in the fixed scroll so as to connect a working fluid suction port formed in the fixed scroll and a working fluid discharge port formed in the fixed scroll;
A compression chamber formed in the working fluid passage by meshing the fixed scroll and the orbiting scroll;
A discharge pressure chamber provided in the sealed container so as to communicate with the compression chamber through the discharge port;
A plurality of release valve devices that are arranged on the fixed scroll and open to communicate the working fluid passage and the discharge pressure chamber when the pressure of the working fluid passage rises above a set pressure;
The release valve device includes a release passage that communicates the compression chamber and the discharge pressure chamber, a release valve that opens and closes the release passage, and an elastic pressing force on the release valve that is disposed above the release valve. A valve pressing body to be applied,
The scroll compressor characterized by the retainer which restrict | limits the movement range of the said valve press body having a some gas passage more than the number of the said release valve apparatus. The scroll compressor according to claim 1, wherein
The scroll compressor characterized in that the shape of the gas passage of the retainer is a polygon. The scroll compressor according to claim 1, wherein
A scroll compressor characterized in that the shape of the gas passage of the retainer is substantially circular. In the scroll compressor as described in any one of Claim 1 to 3,
A scroll compressor having a plurality of bolt fastening surfaces protruding from an outer peripheral surface of the retainer. In the scroll compressor as described in any one of Claim 1 to 4,
A scroll compressor having a relationship of A <B, where A is an area of the release channel and B is a gas passage area of the retainer.