JP2001329975A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor with an advantageous cost capable of enhancing a followability and a compression efficiency by integrally forming a discharge valve and a bypass valve for preventing an excess compression by a material having a good followability and capable of effectively carrying out an oil separation by providing a flange as a discharge valve-press to impart an oil separation function. SOLUTION: A stationary scroll 4 on which a lap is standingly provided and a rotation scroll form a compression chamber by engaging the laps with each other. A discharge valve 17 is disposed at an outlet side of a discharge aperture 14. A first bypass hole 20 communicating the compression chamber with a discharge chamber and a second bypass hole 21 are provided. A first bypass valve 20a and a second bypass valve 21a for opening/closing the first bypass hole 20 and the second bypass hole 21 are disposed. The scroll compressor is provided with a bypass valve-press 18 covering the first bypass valve 20a, the second bypass valve 21a and the discharge valve 17 and restricting a valve open degree. The discharge valve 17 and the first bypass valve 20a are integrally formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a mounting structure of a discharge valve disposed in a discharge hole of a fixed scroll and a bypass valve for preventing over-compression and liquid compression.

[0002]

2. Description of the Related Art Conventional scroll compressors include, for example, those shown in FIGS. In the figure, an electric motor 2 and a compression unit 3 are built in an airtight container 1, and the compression unit 3 is mainly composed of a fixed scroll 4, an orbiting scroll 6, an Oldham ring 7, a crankshaft 8, an eccentric bearing 12, a main frame 11 and a shaft 10. Is configured. In this configuration, a spiral fixed scroll wrap 4b is integrally formed on the fixed end plate 4a, and the fixed scroll 4 fixed to the main frame 11, the spiral orbiting scroll wrap 6b on the orbiting end plate 6a, and an orbital drive to the back. The orbiting scroll 6 integrally formed with the shaft 6c is engaged with the orbiting scroll wrap 6b inside to form a plurality of compression chambers 5.

When the electric motor 2 rotates, the main frame 11
The orbiting scroll 6 is caused to orbit by the orbiting drive shaft 6c via the eccentric bearing 12 fitted to the crankshaft 8 formed at the tip of the shaft 10 attached to the shaft 10 while preventing rotation by the Oldham ring 7. The low-pressure refrigerant sucked into the compression section 3 from the suction pipe 13 by the orbiting movement of the orbiting scroll 6 is compressed while moving sequentially from the outer periphery to the center of the compression chamber 5 to become a high-pressure refrigerant gas. The discharge valve 17 ′ is opened by the pressure and discharged into the discharge chamber 15, and is discharged from the discharge pipe 16 to the outside of the closed casing 1 via the motor chamber 2 a.

In the above, immediately after the compressor stops, the high-pressure refrigerant gas discharged from the discharge chamber 15 flows back into the compression chamber 5 lower than the high pressure, causing the orbiting scroll 6 to reverse, generating a loud impact sound. I will. To prevent this, a discharge valve 1 made of an elastic material that opens and closes the discharge hole 14 on the discharge chamber 15 side
7 'is provided. Further, a valve retainer 18 'which covers the discharge valve 17' and regulates the valve opening is provided, and the discharge valve 17 'is repeatedly opened and closed by pulsation according to the flow of gas.

[0005] In the scroll compressor, the suction pressure and the discharge pressure of the refrigerant change due to the variable speed operation and the fluctuation of the air conditioning load. The difference between the actual compression ratio and the set compression ratio causes under-compression or over-compression operation. In addition, when a so-called liquid compression phenomenon occurs in which a liquid refrigerant or a large amount of lubricating oil is compressed, an excessive compression state occurs, which may cause an abnormal rise in compression input, excessive vibration and noise, compressor damage, and the like. .

In order to prevent such over-compression and liquid compression, a plurality of bypass holes 20 and 21 for communicating the compression chamber 5 and the discharge chamber 15 are provided, and a discharge chamber is provided at the outlet side of the bypass holes 20 and 21. Means are known in which bypass valves 20a and 21a for allowing only the refrigerant to flow out to 15 are provided, the bypass valves 20a and 21a are covered, and a valve retainer 22 'for regulating the valve opening is known.

In the above construction, the discharge valve 17 'and the bypass valve 20 are provided in the discharge hole 14 and the bypass holes 20 and 21, respectively.
a, 21a, and the valve retainer 22 '
The configuration using 9 'increases the number of parts. Therefore, as shown in FIG.
a, a method of integrally forming the discharge valve retainer 18 'and the bypass valve retainer 22' is known.

However, the discharge hole 14 and the bypass valve 20a for preventing over-compression need to have a highly compliant member. As shown in FIG. 4, the discharge hole 14 and all bypass valves for preventing over-compression and liquid compression are required. If the 20a and 21a are integrally formed, made large, and made of a high-quality member having high followability, there is a problem that the cost increases. In addition, in order to improve the oil separation efficiency in the discharge chamber 15, as shown in FIG.
It is known to provide a discharge cover 23 on the surface of the end plate 4a on the discharge chamber 15 side. However, the valve retainer 18 'and the discharge cover 23
If both are provided in the discharge chamber 15, there is a problem that the structure becomes complicated and the heat capacity of the discharge chamber 15 becomes large.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has an object to improve the followability and improve the compression efficiency by integrally forming a discharge valve and a bypass valve for preventing excessive compression. It is another object of the present invention to provide a scroll compressor that can effectively perform oil separation by providing a flange on a discharge valve retainer and having an oil separation function, and that is advantageous in cost.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. An electric motor and a compression section are arranged in a closed container, and the compression section is swirled on a head plate having a discharge hole in the center. A plurality of compression chambers are formed by engaging the wrap with a fixed scroll with a wound wrap standing up and a revolving scroll with a spiral wrap standing on the head plate, and moving toward the center of the scroll. By compressing the gas in the compression chamber by discharging the compressed gas from the discharge hole to the discharge chamber,
A discharge valve that opens and closes the discharge hole is disposed on the discharge chamber side, and a first bypass hole and a second bypass hole that communicate the plurality of compression chambers and the discharge chamber are provided. A first bypass valve and a second bypass valve that open and close the first bypass hole and the second bypass hole, respectively, on the side of the first bypass valve and the second bypass valve; , And the discharge compressor and the first bypass valve are integrally formed, and the second bypass valve is formed separately. Have been.

The discharge valve, the first bypass valve, and the second bypass valve each include a one-curved portion for opening and closing the discharge hole and the bypass hole, and a flat portion extending from the one-curved portion, The distal end of the flat portion is fixed to the fixed scroll.

The first bypass valve and the second bypass valve are made of elastic materials made of different materials.

Further, the discharge valve and the valve press for holding the first bypass valve are integrally formed.

Further, a flange is provided on an outer peripheral portion of the integral valve retainer.

[0015] Further, the integrated valve retainer has a separating function for separating oil contained in the discharge gas.

Further, a check valve is used for the discharge valve, the first bypass valve, and the second bypass valve.

Further, the first bypass hole is provided for preventing over-compression, and the second bypass hole is provided for preventing liquid compression.

Further, the first bypass hole and the second bypass hole are each formed of at least two or more pairs of holes.

Further, the first bypass hole communicates with a compression chamber near the discharge hole, and the second bypass hole communicates with a compression chamber near the refrigerant suction side of the compression section. I have.

[0020]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a sectional view of a scroll compressor showing an embodiment of the present invention, FIG. 2 is an enlarged view of a main part, (A) is a top view, (B) is a sectional view, and FIG. 3 is a fixed scroll showing a bypass hole. FIG. In the figure,
An electric motor 2 and a compression unit 3 are arranged on the left and right sides in a closed container 1, and the compression unit 3 is swirled to form a plurality of compression chambers 5 by meshing with the fixed scroll 4 and the fixed scroll 4. A scroll 6, an Oldham ring 7 for preventing rotation of the orbiting scroll 6, and a orbiting drive shaft 6c of the orbiting scroll 6 formed with a crankshaft 8 at a lower end for orbital driving, and a lubricating oil supply penetrating from the upper end to the lower end. A scroll compressor is composed of a shaft 10 having a passage 9 formed therein, a main frame 11 for supporting the crankshaft 8, and an eccentric bearing 12.

In this configuration, a fixed scroll plate 4a is formed integrally with the fixed end plate 4a and is fixed to the main frame 11, and a spiral scroll wrap 6b is formed on the rotary end plate 6a. Swivel drive shaft on back
The orbiting scroll 6 integrally formed with the orbiting scroll 6c is engaged with the orbiting scroll wrap 6b inside to form a plurality of compression chambers 5.

The low-pressure refrigerant sucked into the compression section 3 from the suction pipe 13 by the orbiting motion of the orbiting scroll 6 is compressed while moving sequentially from the outer periphery to the center of the compression chamber 5 to become a high-pressure refrigerant gas, and the refrigerant gas is discharged. The gas is discharged from the hole 14 into the discharge chamber 15 and discharged from the discharge pipe 16 to the outside of the closed container 1.

At the outlet side (discharge chamber 15 side) of the discharge hole 14,
A discharge valve 17 for opening and closing the discharge hole 14 is provided, and the discharge valve 17 is provided to cover the discharge valve 17 and regulate the opening degree of the discharge valve 17, and the discharge valve press 18 and the discharge valve 17 are provided. Are stacked and screwed to the discharge chamber 5 side of the fixed end plate 4a with screws 19.

A first bypass hole 20 for preventing over-compression, which communicates the fixed scroll 4 with predetermined positions of the plurality of compression chambers 5 and the discharge chamber 15, and a second bypass hole 20 for preventing liquid compression.
A first bypass valve 20a for opening and closing the first bypass hole 20 is formed integrally with the discharge valve 17 and disposed on the discharge chamber 15 side. A second bypass valve 21a for opening and closing the bypass hole 21 is separately provided.

The valve holder that covers the first bypass valve 20a and regulates the opening degree of the valve is formed integrally with the discharge valve holder 18, while covering the second bypass valve 21a. A structure in which a bypass valve retainer 22 for regulating the valve opening is provided, and the bypass valve retainer 22 and the second bypass valve 21a are screwed and fixed to the discharge chamber 5 side of the fixed end plate 4a by screws 19a in a state where the bypass valve retainer 22 and the second bypass valve 21a are overlapped. It has become.

The discharge valve 17 and the first bypass valve 20
a and a second bypass valve 21a are constituted by one curved surface portion for opening and closing the discharge hole 14 and the first and second bypass holes 20 and 21, and a flat surface portion extending from the one curved surface portion. The distal end of the portion is fixed to the fixed scroll 4.

Further, the first bypass valve integrally formed.
20a and the discharge valve 17 are made of an elastic material having a
By using a member made of a different material for the bypass valve 21a, the followability of the discharge valve 17 and the first bypass valve 20a for preventing over-compression is improved, the compression efficiency is improved, and the cost is reduced. This is advantageous.

The discharge valve 17 and the first bypass valve 20
By using a check valve for the second bypass valve 21a and the second bypass valve 21a, it is possible to allow only the refrigerant in the compression chamber 5 to flow out to the discharge chamber 15 and prevent the refrigerant from flowing back to the compression chamber 5. it can.

Also, the first bypass hole 20 and the second
Are formed from at least two or more pairs of holes, respectively, and the first bypass hole 20 is formed.
Is connected to the compression chamber 5 near the discharge port 14 and the second bypass hole 21 is connected to the compression chamber 5 near the refrigerant suction side of the compression section 3 to provide over-compression and liquid compression. When compression occurs, the refrigerant in the compression chamber 5 can be bypassed to the discharge chamber 15 smoothly and with good responsiveness, so that over-compression and liquid compression can be quickly prevented, and the compression efficiency can be improved.

Further, by providing a flange 18a on the outer periphery of the integral discharge valve retainer 18 and using the discharge valve retainer 18 also as an oil separation case, the oil separation efficiency can be improved and the number of parts can be improved. Can be reduced.

As described above, by integrally forming the discharge valve 17 and the first bypass valve 20a for preventing over-compression, it is possible to improve the followability and improve the compression efficiency. By providing the presser 18 with the flange 18a and having an oil separating function, oil separation can be performed effectively, and a scroll compressor which is advantageous in cost can be obtained.

[0032]

As described above, according to the present invention, by integrally forming the discharge valve and the first bypass valve for preventing excessive compression, the followability is improved and the compression efficiency can be improved. By providing a flange on the discharge valve retainer and having an oil separation function, oil separation can be performed effectively, and a scroll compressor that is advantageous in cost can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a scroll compressor according to the present invention and a conventional example.

FIG. 2 is an enlarged view of a main part showing an embodiment of the present invention, wherein (A) is a top view and (B) is a cross-sectional view.

FIG. 3 is an enlarged top view of a main part of a fixed scroll showing an embodiment of the present invention.

FIG. 4 is an enlarged top view of a main part according to a conventional example.

FIG. 5 is an enlarged sectional view of a main part according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Electric motor 3 Compressor 4 Fixed scroll 4a Fixed end plate 4b Fixed scroll wrap 5 Compression chamber 6 Orbiting scroll 6a Orbiting end plate 6b Orbiting scroll wrap 6c Orbital drive shaft 7 Oldham ring 8 Crankshaft 9 Lubricating oil passage 10 Shaft 11 Main Frame 13 suction pipe 14 discharge hole 15 discharge chamber 16 discharge pipe 17 discharge valve 18 discharge valve retainer 18a flange 19 screw 20 first bypass hole 20a first bypass valve 21 second bypass hole 21a second bypass valve 22 bypass Valve retainer

Claims (10)

[Claims] 1. An electric motor and a compression unit are arranged in a closed container,
The compression portion is formed by engaging a fixed scroll in which a spiral wrap is erected on a head plate having a discharge hole in the center and a orbiting scroll in which a spiral wrap is also erected on the head plate. By forming a plurality of compression chambers and reducing the volume as it moves in the center direction of the scroll, the gas in the compression chamber is compressed, and the compressed gas is discharged from the discharge hole to the discharge chamber, and the discharge is performed. A discharge valve that opens and closes the discharge hole is disposed on the outlet side of the hole, and a first bypass hole and a second bypass hole that communicate the plurality of compression chambers and the discharge chamber are provided. A first bypass valve and a second bypass valve for opening and closing the first bypass hole and the second bypass hole, respectively, on the side, and the first bypass valve, the second bypass valve, and the discharge valve; It In a scroll compressor comprising a valve presser for covering and regulating the valve opening, the discharge valve and the first bypass valve are integrally formed, and the second bypass valve is formed separately. A scroll compressor comprising: 2. The discharge valve, the first bypass valve and the second bypass valve each include a one-curved portion for opening and closing the discharge hole and the bypass hole, and a flat portion extending from the one-curved portion, 2. The scroll compressor according to claim 1, wherein a front end of the flat portion is fixed to the fixed scroll. 3. The scroll compressor according to claim 1, wherein the first bypass valve and the second bypass valve are made of different elastic materials. 4. The scroll compressor according to claim 1, wherein said discharge valve and a valve presser for holding said first bypass valve are integrally formed. 5. The scroll compressor according to claim 1, wherein a flange is provided on an outer peripheral portion of the integral valve retainer. 6. The scroll compressor according to claim 1, wherein said integral valve retainer has a separating function of separating oil contained in said discharge gas. 7. The scroll compressor according to claim 1, wherein a check valve is used for the discharge valve, the first bypass valve, and the second bypass valve. 8. The scroll compressor according to claim 1, wherein said first bypass hole is provided for preventing overcompression, and said second bypass hole is provided for preventing liquid compression. 9. The scroll compressor according to claim 1, wherein each of the first bypass hole and the second bypass hole is formed by at least two or more pairs of holes. 10. The method according to claim 1, wherein the first bypass hole communicates with a compression chamber close to the discharge hole, and the second bypass hole communicates with a compression chamber near a refrigerant suction side of the compression section. The scroll compressor according to claim 1 or 9, wherein