JP5078856B2 - Compressor - Google Patents

Description

  The present invention relates to a compressor that sucks fluid from a suction pipe through a check valve, compresses the fluid by a compression mechanism, and discharges the fluid from a discharge pipe, and more particularly relates to improvement of the check valve.

  A compressor that sucks fluid from a suction pipe through a check valve, compresses it by a compression mechanism, and discharges it from a discharge pipe, for example, a scroll compressor, has a check valve and a valve body that is always closed in the closing direction. It consists of an urging spring. When the check valve is installed, the spring is attached in a compressed state so that the valve body can always be urged in the closing direction by the return force of the spring, and the spring and the valve body are always in contact with each other. This prevents the spring from falling off the valve body.

  However, in a compressor using a check valve that maintains the assembled state with the valve body only by the restoring force of the spring, the spring falls off from the valve body during startup and stop during the operation of the compressor, In some cases, the spring jumps out of the installation part and bites into the movable part.

  Therefore, the spring and the valve body are integrated by direct resistance welding (for example, Patent Document 1), or one end of the spring is directly press-fitted into the cap-shaped valve body (for example, Patent Document 2) and one in which one end of a spring is simply engaged with a circumferential groove provided in a valve body (for example, Patent Document 3) have been proposed.

Japanese Patent Laying-Open No. 2004-137922 (FIG. 1) Japanese Utility Model Publication No. 62-169279 (FIG. 2) Japanese Utility Model Publication No. 5-40671 (FIG. 1)

  However, in the case where the spring and the valve body are integrated directly by resistance welding, if the valve body is dirty or surface-treated, the surface of the valve body is cracked during welding. There was a new problem of chipping and chipping and unwelded parts.

  In addition, the spring may be displaced from the position of the fitting portion or the locking portion with the valve body or may be dropped in the worst case, which is not sufficient in terms of ensuring reliability.

  The technical problem of the present invention is that when the spring and the valve body are integrated, the surface of the valve body is not cracked or chipped, and after assembly, the spring is not displaced or dropped from the valve body. It is to be able to improve quality.

A compressor according to the present invention is a compressor that sucks fluid from a suction pipe through a check valve, compresses the fluid by a compression mechanism, and discharges the fluid from a discharge pipe. The check valve is a cap-shaped valve. An inner cap formed by press-molding a sheet metal or an inner cap composed of a forged product is attached and welded to the body and one end, and the inner cap is press-fitted into a cap-shaped valve body and integrated. ized, Ru der those constituted by a spring which constantly urges the valve body in the closed direction.

According to the compressor of the present invention, since the spring and the valve body are not welded, the surface of the valve body is not cracked or chipped. Further, the spring and the valve body, a more fixed pressure inlet of the cap each other, because they are integrated, or offset spring from the valve member after assembling, without falling off, thus improving the quality.

Embodiment 1. FIG.
FIG. 1 is a longitudinal sectional view showing an overall configuration of a compressor according to Embodiment 1 in which the present invention is applied to a high-pressure shell-type frame compliant scroll compressor, and FIG. 2 is an enlarged view of a check valve mounting portion as a main part thereof. FIG. 3 is a front view including a partial sectional view showing the check valve.

  As for the compressor of this embodiment, ie, the scroll compressor, the outer peripheral part of the fixed scroll 1 is fastened to the guide frame 15 with the volt | bolt (not shown) like FIG. A plate-like spiral tooth 1b is formed on one surface (lower side in FIG. 1) of the base plate portion 1a, and at the same time, two Oldham guide grooves 1c are formed on a substantially straight line. A claw 9c of the Oldham ring 9 is engaged with the Oldham guide groove 1c so as to be slidable back and forth. Furthermore, a valve passage 1g is provided in the plate-like spiral tooth 1b of the fixed scroll 1 so as to communicate with the suction chamber from a right angle direction, and a valve body 17a of the suction check valve 17 is slidably provided therein, A suction pipe 10 a is press-fitted through the sealed container 10. That is, the suction check valve 17 is welded with a cap-shaped valve body 17a and an inner cap 17g formed by press-molding a sheet metal on one end 18b side as shown in FIG. A cap-shaped valve body 17a is integrally formed by being press-fitted into the cap-shaped valve body 17a, and is configured by a spring 18a that constantly urges the valve body 17a in the suction pipe closing direction. The suction pipe 10a is sealed to prevent the reverse flow of the refrigerant.

  Below the fixed scroll 1, an orbiting scroll 2 is disposed so as to face the upper surface of the base plate portion 2a of the orbiting scroll 2, and is formed by an involute curve provided on the base plate portion 1a of the fixed scroll 1. A plate-like spiral tooth 2b having substantially the same shape as the plate-like spiral tooth 1b is provided, and these plate-like spiral teeth 1b, 2b are geometrically formed with a compression chamber 1d therebetween. It is engaged. A hollow cylindrical boss 2f is formed at the center of the surface of the base plate 2a opposite to the plate-like spiral teeth 2b, and is rotatably engaged with the swing shaft 4b at the upper end of the main shaft 4. Yes. In addition, a thrust surface 2d is formed on the same surface so as to be slidable against the thrust bearing 3a of the compliance frame 3. Two Oldham guide grooves 2e having a phase difference of 90 degrees from the Oldham guide groove 1c of the fixed scroll 1 are formed on the outer peripheral portion of the base plate portion 2a of the orbiting scroll 2 in a substantially straight line. A claw 9a of the Oldham ring 9 is engaged with the guide groove 2e so as to be slidable back and forth. Further, the base plate 2a is provided with an extraction hole 2j that penetrates the compression chamber 1d and the thrust surface 2d, and has a structure for extracting refrigerant gas during compression and guiding it to the thrust surface 2d.

  The compliant frame 3 has two upper and lower cylindrical surfaces 3d and 3e provided on the outer peripheral portion thereof supported in a radial direction by cylindrical surfaces 15a and 15b provided on the inner peripheral portion of the guide frame 15, and has a central portion. Are formed with a main bearing 3c and a sub main bearing 3h for supporting the main shaft 4 driven to rotate by the electric motor stator 7 in the radial direction. Further, a communication passage 3s penetrating in the axial direction from the surface of the thrust bearing 3a is provided, and the thrust bearing side opening 3k is arranged to face the swing scroll extraction hole 2j.

  Although the outer peripheral surface 15g of the guide frame 15 is fixed to the sealed container 10 by shrink fitting or welding, the high pressure discharged from the discharge port 1f of the fixed scroll 1 by the notch 15c provided on the outer peripheral portion. A flow path for guiding the refrigerant gas to the discharge pipe 10b provided between the compression mechanism (1, 2, 3, 15) and the electric motor element (7, 8) is secured. The notch 15c is provided at a position opposite to the discharge pipe 10b. Further, on the inner peripheral surface of the guide frame 15, there are provided two cylindrical grooves 15 a and 15 b that engage with the upper and lower cylindrical surfaces 3 d and 3 e formed on the outer peripheral surface of the compliant frame 3 and two seal grooves that store the sealing material. The sealing materials 16a and 16b are respectively installed. The frame space 15f formed by the inner peripheral surface of the guide frame 15 and the outer peripheral surface of the compliant frame 3 sealed by using these two sealing materials 16a and 16b communicates only with the communication passage 3s of the compliant frame 3. The refrigerant gas that is being compressed is supplied from the swing scroll bleed hole 2j.

  The main shaft 4 is formed with an oscillating shaft 4b rotatably engaged with an oscillating bearing 2c of the oscillating scroll 2 at an upper end portion thereof, and a main shaft balancer 4e is fitted on the lower side thereof. . Furthermore, a main shaft portion 4c that is rotatably engaged with the main bearing 3c and the sub main bearing 3h of the compliant frame 3 is formed therebelow. A sub shaft portion 4d that is rotatably engaged with the sub bearing 6a of the sub frame 6 is formed below the main shaft 4, and the motor rotor 8 is interposed between the sub shaft portion 4d and the main shaft portion 4c. Is shrink-fitted. An upper balancer 8a is fixed to the upper end surface of the motor rotor 8, and a lower balancer 8b is fixed to the lower end surface, and a total of three balancers together with the spindle balancer 4e described above provide a static balance and a dynamic balance. It has been. Further, an oil pipe 4f is press-fitted into the lower end of the main shaft 4, and the periphery thereof is surrounded by a cylindrical vortex ripple prevention wall 20, and the refrigerating machine oil collected in the oil sump 10g at the bottom of the sealed container 10 by the oil pipe 4f. 10e is sucked up, and the vortex preventing wall 20 prevents the vortex generated by the rotation of the oil pipe 4f from spreading around and affecting the suction of the refrigerating machine oil 10e.

  The motor stator 7 has a notch 7a formed in the outer peripheral portion thereof so as to penetrate in the vertical direction. The notch 7a allows the space between the compression mechanism and the motor element, and between the motor element and the subframe 6. The space 10d is communicated with each other. Furthermore, a hole 6b is also formed in the subframe 6, and the space 10d communicates with the upper space in the sump 10g through the hole 6b. Therefore, the upper space in the oil sump 10g communicates with the space between the compression mechanism portion and the motor element via the hole 6b of the subframe 6 and the notch portion 7a of the motor stator 7, and the high pressure refrigerant. The pressure is the same as the space filled with gas. A glass terminal 10f is installed on the side surface of the hermetic container 10 and a lead wire from the motor stator 7 is coupled thereto.

  Next, the basic operation of the compressor of this embodiment, that is, the scroll compressor, will be described with reference to FIGS. In operation, the suction refrigerant is sucked from the suction pipe 10a, and the suction check valve 17 is overcome by the suction pressure to be pushed down to the valve stop surface 1e (FIG. 2). It enters the compression chamber 1d formed by the plate-like spiral teeth 1b and 2b. The orbiting scroll 2 driven by the electric motor stator 7 reduces the volume of the compression chamber 1d along with the eccentric turning motion. Due to this compression stroke, the suction refrigerant becomes high pressure and is discharged into the sealed container 10 from the discharge port 1 f of the fixed scroll 1. That is, three operations of refrigerant suction → compression → discharge are periodically and continuously performed in one eccentric turning motion (360 ° eccentric turning motion). In this compression stroke, the intermediate-pressure refrigerant gas in the middle of compression is guided to the frame space 15f through the communication passage 3s of the compliant frame 3 from the extraction hole 2j of the orbiting scroll 2, and is intermediate in the frame space 15f. Maintain pressure atmosphere. The high-pressure discharge gas fills the sealed container 10 with a high-pressure atmosphere and is discharged from the discharge pipe 10b to the outside of the compressor.

  The refrigerating machine oil 10e accumulated in the oil sump 10g at the bottom of the hermetic container 10 is guided to the rocking bearing space 2g through the hollow space 4g penetrating the main shaft 4 in the axial direction by the differential pressure. The refrigerating machine oil 10e that has become an intermediate pressure by the squeezing action of the bearing portion fills a space (boss portion space) 2h surrounded by the orbiting scroll 2 and the compliant frame 3, and pressure that connects this space and the low-pressure atmosphere space. It is led to a low pressure space via a regulating valve (not shown) and sucked into the compression chamber 1d together with a low pressure refrigerant gas. The refrigerating machine oil 10e is discharged into the sealed container 10 from the discharge port 1f together with the high-pressure refrigerant gas by the compression stroke.

  During operation and start-up with the refrigerant flow rate increased, the refrigerant pushes down the valve body 17a of the suction check valve 17 against the biasing force of the spring 18a, and the suction passage from the valve passage 1g as shown in FIG. It flows through the opening 1i of the hole and into the scroll (compression chamber 1d). If the flow of the refrigerant causes the spring 18a to drop from the spring accommodating portion 17b (FIGS. 2 and 3) of the suction check valve 17, it passes through the opening 1i of the suction passage hole and moves toward the swing scroll 2. It jumps out and is sandwiched between the orbiting scroll 2 and the fixed scroll 1. However, in the present embodiment, as shown in FIG. 3, an inner cap 17g formed by press-molding a sheet metal is attached and welded to one end 18b of the spring 18a, and the inner cap 17g is welded inside the cap-shaped valve body 17a. Since these are integrated by press-fitting into the valve body, when the spring 18a and the valve body 17a are integrated, the surface of the valve body is not cracked or chipped, and the spring 18a is attached to the valve body 17a after assembly. It is possible to improve quality and reliability without shifting or falling off.

Embodiment 2. FIG.
FIG. 4 is a front view including a partial cross-sectional view showing a check valve that is a main part of a compressor according to Embodiment 2 in which the present invention is applied to a scroll compressor. The parts are given the same reference numerals. In the description, reference is made to FIG.

  The compressor of this embodiment, that is, the scroll compressor, has a suction check valve 17A, a cap-shaped valve body 17a as shown in FIG. 4, and an inner cap 17h made of a forged product on one end 18b side. The inner cap 17h is press-fitted into the cap-shaped valve body 17a and integrated, and the spring 18a is always urged in the suction pipe closing direction while being welded. 1 differs only in the material of the inner cap and has all the functions of the first embodiment.

  In the present embodiment, since the inner cap 17h is formed of a forged product, in addition to the same functions and effects as those of the first embodiment, the strength is high and the durability is improved, and the suction check valve 17A There is an advantage that the service life can be extended.

Example Figure 5 is a front view including a partial cross-sectional view showing a check valve is a main part of a compressor according to a reference example, in the figure, the same reference numerals are given to the first embodiment the same parts of the foregoing It is. In the description, reference is made to FIG.

In the compressor of this reference example , that is, the scroll compressor, the suction check valve 17B is fixed to the valve body 17a by a rivet 17i and a cap-like valve body 17a as shown in FIG. This is configured by a spring 18a that is constantly urged in the closing direction, and the other configuration is the same as that of the first embodiment.

Also in this reference example , since the spring 18a and the valve body 17a are integrated by caulking with the rivet 17i, the crack or chipping of the valve body surface when the spring and valve body are integrated directly by resistance welding is used. In addition, the spring 18a is not displaced from the valve body 17a after assembly, and the quality is improved.

In the first and second embodiments described above, the present invention is used as an example for a scroll compressor. However, if the suction check valve similar to the present invention is provided on the suction side, the rest is used. It goes without saying that the present invention can be applied to other compressors such as a rotary compressor and a reciprocating compressor.

It is a longitudinal cross-sectional view which shows the whole structure of the compressor which concerns on Embodiment 1 of this invention. It is a top view which expands and shows the non-return valve attachment part which is the principal part of the compressor which concerns on Embodiment 1 of this invention. It is a front view including the partial cross section showing the check valve of the compressor concerning Embodiment 1 of the present invention. It is a front view including the partial cross section showing the check valve of the compressor concerning Embodiment 2 of the present invention. It is a front view including the partial cross section display which shows the check valve of the compressor which concerns on a reference example .

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Fixed scroll (compression mechanism part), 2 Swing scroll (compression mechanism part), 3 Compliance frame (compression mechanism part), 10a Intake pipe, 10b Discharge pipe, 15 Guide frame (compression mechanism part), 17, 17A, 17B One end of suction check valve (check valve), 17a cap-shaped valve body, 17g inner cap (made of sheet metal), 17h inner cap (forged product), 17i rivet, 18a spring, 18b spring.

Claims (2)

A compressor that sucks fluid from a suction pipe through a check valve, compresses it by a compression mechanism, and discharges it from a discharge pipe.
The check valve,
A cap-shaped valve body;
An inner cap formed by press-molding a sheet metal on one end is attached and welded, and the inner cap is press-fitted into the cap-shaped valve body and integrated, and the valve body is always urged in the closing direction. A compressor characterized by comprising a spring that performs. A compressor that sucks fluid from a suction pipe through a check valve, compresses it by a compression mechanism, and discharges it from a discharge pipe.
The check valve,
A cap-shaped valve body;
An inner cap made of a forged product is attached and welded to one end side, and the inner cap is press-fitted into the cap-shaped valve body and integrated to constantly bias the valve body in the closing direction. A compressor characterized by comprising a spring.

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