JPH11141475A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the prevention of liquid compression and the prevention of gas compression by providing a hole passing through from a compressing chamber into a sealed vessel on the end plate of a fixed scroll, and providing a liquid compression preventing and gas excessive compression preventing multi- release mechanism having a release valve on the other side surface of the end plate corresponding to the hole. SOLUTION: In a fixed scroll 15 of a compressor, one through-hole 37 of a multi-release mechanism is provided between positions (b), (d) of a fixed lap 16, and the other through-hole 37 is provided in a position opposed to the through-hole 37 around the base circle 38 of the involute curve of the fixed lap 16. The multi-release mechanism is formed of the through-holes 37, 37 passing through from a compression chamber 17 into a sealed vessel on the end plate 22 of the fixed scroll 15 and release valves provided on the other side surface of the end plate 22 corresponding to the through-holes 37, 37. In order to increase the liquid compression preventing effect and gas excessive compression preventing effect, one through-hole 37 is provided adjacently to the discharge port 19 side of the fixed lap 16, and the other through-hole 37 is provided adjacently to the outside of the discharge port 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor mounted on, for example, an air conditioner or a refrigerator, and more particularly, to a plurality of scroll compressors formed by meshing a fixed scroll and an orbiting scroll. The present invention relates to a scroll compressor in which a compressed gas compressed in a compression chamber is discharged into a closed container and then discharged outside the closed container.

[0002]

2. Description of the Related Art Conventionally, a scroll type compressor 1 used in a refrigeration cycle of an air conditioner or the like has a structure shown in FIG. 3, for example. An electric element 2 and a scroll compression element 3 are incorporated inside a cylindrical closed container 1 having both ends closed. The electric element 2 includes a stator 4 fixed to the inner wall surface side of the closed container 1 and a rotor 5 rotatably supported inside the stator 4, and a rotary shaft 6 penetrates the rotor 5. Is joined to. One end of the rotating shaft 6 is connected to the scroll compression element 3.
Are rotatably supported by a support frame 7 which constitutes a part of. The other end of the rotating shaft 6 protrudes from the rotor 5, and an oil supply unit 8 is connected to the tip. An oil introduction pipe 9 is connected to an end of the oil supply section 8. The end on the suction side of the oil introduction pipe 9 is extended downward so as to be immersed in the lubricating oil b contained in the closed container 1. An oil passage 10 is formed in the rotating shaft 6 in the axial direction by sucking and supplying the lubricating oil b from the oil supply unit 8, and the lubricating oil passes through the oil passage 10 and slides on the support frame 7 and the like. After being supplied to the section, it is recirculated.

[0003] One end of the rotary shaft 6 supported so as to penetrate the support frame 7 has a pin portion (crank portion) whose center is provided eccentrically with the axis of the rotary shaft 6.
The orbiting scroll 12 is connected to the pin portion 11. This oscillating scroll 1
A boss hole 1 is formed in a disk shape, and the pin portion 11 is connected to the center of one side surface of the disk-shaped end plate 21.
3 are formed. End plate 2 of this orbiting scroll 12
On the other side 1 is an involute curved swing wrap 14
Are integrally formed. A fixed scroll 15 formed in a disk shape is connected to the support frame 7. A fixed wrap 16 having an involute curve is formed on a portion of the end plate 22 of the fixed scroll 15 facing the orbiting scroll 12, and a plurality of compression chambers 17 are formed between the end plate 22 and the orbiting wrap 14. I have. As shown in FIG. 4 (a), the refrigerant gas introduced from the outside of the closed vessel 1 to the outer peripheral portion of the scroll compression element 3 via the suction pipe 18 and the first suction port 30 of the fixed scroll 15 It is sucked from two places of the second suction port 32 connected to the position corresponding to the first suction port 30 by the communication groove 31 communicating with the first suction port 30, compressed in the compression chamber 17, and gradually moves to the center. Fixed scroll 1
Discharge port 19 provided at the center of the other side surface of end plate 22 of No. 5
Is discharged into the closed container 1, and the entrained lubricating oil is separated in this space, and pulsation is reduced.

[0004] The compressed gas discharged from the discharge port 19 into the closed container 1 is supplied to the fixed scroll 1 as shown by a white arrow.
5 and a passage (not shown) provided in the support frame 7,
The lubricating oil in the refrigerant gas is further separated by the centrifugal force or the like generated by the rotation of the rotor 5 by going to the electric element 2 side, and the refrigerant gas from which the lubricating oil has been separated is discharged from the discharge pipe 20 to the outside of the closed casing 1. The separated lubricating oil flows as shown by the black arrows, accumulates at the bottom of the closed container 1, and is circulated for use.

As shown in FIG. 4 (b), in order to ensure the safety and maintain the function of the scroll compression element 3, a gas overcompression prevention mechanism 33 (or a liquid compression prevention mechanism. ) Is provided on the fixed scroll 15. The gas over-compression preventing mechanism 33 is provided with holes 34, 34 penetrating from the compression chamber 17 into the closed container 1 in the end plate 22 of the fixed scroll 15, and a release provided on the other side of the end plate 22 corresponding to the holes 34. It is composed of valves 35, 35. One hole 34 is provided close to the discharge port 19 side of the fixed wrap 16, and the other hole 34 is provided close to the outside of the discharge port 19 of the fixed wrap 16.

The function of the gas over-compression prevention mechanism 33 is as shown in FIGS. 5A to 5C, in which the sucked refrigerant gas is compressed in the plurality of compression chambers 17 and gradually moves to the center. When the refrigerant gas in the compression chamber 17 shown in (b) is in an over-compressed state (or when the inside of the compression chamber 17 is filled with the refrigerant liquid) as shown in FIG. The valves 35, 35 are opened to release the refrigerant in the compression chamber 17 into the closed container 1 through the through holes 34, 34, and as shown in (c), the compression chamber 17 and the discharge port 19
Is communicated, the refrigerant gas in the compression chamber is discharged from the discharge port 19 into the closed container 1.

FIG. 6 shows the progress of compression of refrigerant gas in a scroll compression element of another conventional scroll compressor. In this example, a liquid compression prevention mechanism and a gas over-compression prevention mechanism are provided on the fixed scroll 15 to ensure the safety and maintain the function of the scroll compression element. The liquid compression prevention mechanism is configured in the same manner as the gas overcompression prevention mechanism 33, that is, the head 36 of the fixed scroll 15 has holes 36, 36 penetrating from the compression chamber 17 into the closed container 1 and the holes 36, 36. Correspondingly, a release valve (not shown) is provided on the other side surface of the head plate. The gas over-compression prevention mechanism is configured in the same manner as the gas over-compression prevention mechanism 33, that is, the compression chamber 1 is attached to the end plate of the fixed scroll 15.
7, holes 34, 34 penetrating into the closed container 1, and release valves (not shown) provided on the other side surface of the end plate corresponding to the holes 34. One of the two through holes 34 and 36 is close to the discharge port 19 side of the fixed wrap 16, and the other hole of the through holes 34 and 36 is outside the discharge port 19 of the fixed wrap 16. Is provided in the vicinity.

As shown in FIGS. 6A to 6C, the sucked refrigerant gas is compressed in the plurality of compression chambers 17 and gradually moves to the center to reduce the volume. ,
When the refrigerant gas in the compression chamber 17 shown in (b) is over-compressed or the compression chamber 17 is filled with the refrigerant liquid, the corresponding release valve is opened and the compression chamber 17 is opened. The refrigerant gas is released through the through holes 34, 34 and the refrigerant liquid is released into the closed container 1 through 36, 36. When the compression chamber 17 and the discharge port 19 communicate with each other as shown in FIG. The refrigerant gas is discharged from the discharge port 19 into the closed container 1. As described above, if the liquid compression preventing mechanism and the gas overcompressing preventing mechanism are provided in the fixed scroll 15, high security is ensured, but there is a disadvantage that the mechanisms are complicated and the cost is increased.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a highly reliable scroll compressor having a fixed scroll 15 provided with a simple mechanism capable of preventing liquid compression and gas compression. is there.

[0010]

The inventors of the present invention have conducted intensive studies on such problems, and as a result, for example, the through-holes 34 of the conventional gas over-compression prevention mechanism 33 and the through-holes 36 of the liquid compression prevention mechanism have been described.
It has been found that the problem can be solved by providing a multi-release mechanism for preventing liquid compression and gas over-compression at a specific position between them, and the present invention has been accomplished.

That is, the invention according to claim 1 of the present invention includes an electric element and a scroll compression element driven by the electric element in a closed container, and the scroll compression element is provided on one side surface of a disk-shaped end plate. A fixed wrap having an involute curve, a fixed scroll having a discharge port at a central portion, and an orbiting scroll having an involute curved wrap revolving around the fixed scroll by driving the electric element are meshed with each other. A plurality of compression chambers are formed together, and the refrigerant gas sucked from outside the closed container is sequentially compressed in the compression chamber and discharged into the closed container through the discharge port, and then discharged outside the closed container. A scroll-type compressor, wherein a hole is formed in the head plate from the compression chamber into the closed container, and a hole is formed in the other side of the head plate corresponding to the hole. A scroll-type compressor characterized by comprising a multi-release mechanism for preventing liquid compression prevention and gas over-compression with a valve.

According to a second aspect of the present invention, in the scroll compressor according to the first aspect, the refrigerant gas in the compression chamber located closest to the discharge port among the plurality of compression chambers is supplied to the discharge port. A hole of the multi-release mechanism is provided between the position of the rearmost end of the compression chamber immediately before communicating with the compression chamber and the position of the rearmost end of the compression chamber in which the refrigerant gas in the compression chamber has the maximum volume, Another hole of the multi-release mechanism is provided at a position opposed to a base circle of an involute curve of the fixed wrap as a center.

According to a third aspect of the present invention, in the scroll compressor according to the second aspect, one hole of the multi-release mechanism is close to the discharge port side of the fixed wrap, and the other hole is It is characterized in that it is provided close to the outside of the discharge port of the fixed wrap.

According to a fourth aspect of the present invention, there is provided the scroll type compressor according to the second or third aspect, wherein one of the holes of the multi-release mechanism does not lose the compression balance to the suction side where the liquid refrigerant is easily sucked. It is characterized by being relocated within the range.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings shown in FIGS. FIG.
(A) is a scroll type compressor provided with a multi-release mechanism for preventing liquid compression and gas over-compression, of the plurality of compression chambers of the scroll compressor of the present invention in the compression chamber 17 located closest to the discharge port 19. FIG. 7 is an explanatory view showing a position b at the rearmost end of the compression chamber 17 immediately before the refrigerant gas communicates with the discharge port 19, and (b) shows compression when the refrigerant gas in the compression chamber 17 has a maximum volume. It is explanatory drawing which shows the position d of the rear end part of the chamber 17A. FIG. 2 is an explanatory view showing positions of through holes of another scroll type compressor of the present invention provided with a multi-release mechanism for preventing liquid compression and gas over-compression. FIG.
2 to FIG. 2, the parts denoted by the same reference numerals as those in FIGS. 3, 4, 5, and 6 are the same as those in FIGS. 3, 4, 5, and 6.
This is a part having the same function as the part with the same reference numeral described in.

In FIGS. 1A and 1B, a is a straight line connecting a base circle (tangent) 38 of the involute curve of the fixed wrap 16 and the position b, and c is a base circle of the involute curve of the fixed wrap 16 (see FIG. 1). (Tangent line) 38 and a straight line connecting the position d. Θ1 indicates the angle between the straight line a and the straight line c. One through hole 37 of a multi-release mechanism for preventing liquid compression and gas over-compression is provided between the position b and the position d. The through-hole 37 is provided around a base circle 38 of an involute curve of the fixed wrap 16. Another through-hole 37 is provided at a position facing the through-hole 37. The multi-release mechanism for preventing liquid compression and gas over-compression is configured similarly to the gas over-compression prevention mechanism 33. That is, the end plate 22 of the fixed scroll 15 includes holes 37, 37 penetrating from the compression chamber 17 into the closed container 1, and a release valve (not shown) provided on the other side surface of the end plate 22 corresponding to the through hole 37. Have been. The scroll compressor of the present invention has the same configuration as the conventional scroll compressor 1 shown in FIG.

The position where the through hole 37 is provided is the position b
There is no particular limitation as long as it is between and position d. However, as shown in FIG. 1, in order to increase the liquid compression preventing effect and the gas overcompression preventing effect, one through hole 37 is provided close to the discharge port 19 side of the fixed wrap 16 and the other through hole 37 is provided. The hole 37 is preferably provided in the fixing wrap 16 close to the outside of the discharge port 19. And Θ1 is usually 0
Over 120 degrees.

The position of the through hole 37 of the multi-release mechanism for preventing liquid compression and gas over-compression is closer to the refrigerant inlet than the position of the through-hole 34 of the conventional gas over-compression prevention mechanism shown in FIG. Further, it is closer to the discharge port 19 than the position of the through hole 36 of the conventional liquid compression preventing mechanism. Since it is not actually the case that all the refrigerant sucked from the first suction port 30 and the second suction port 32 is liquid, the multi-release mechanism for preventing liquid compression and gas over-compression has a sufficient liquid compression preventing function. It can be used effectively. The multi-release mechanism for preventing liquid compression and gas over-compression simultaneously has a gas over-compression preventing action, and the refrigerant gas sucked is compressed in the plurality of compression chambers 17 and gradually moves to the center. When the volume of the refrigerant gas is reduced and the refrigerant gas in the compression chamber 17 is overcompressed, a release valve (not shown) is opened to open the compression chamber 1.
The refrigerant in 7 is released into the closed container 1 through the through holes 37, 37, and when the compression chamber 17 communicates with the discharge port 19, the refrigerant gas in the compression chamber is discharged from the discharge port 19 into the closed container 1. It has become.

As shown in FIG. 2, one of the through holes 37 of another scroll type compressor of the present invention having a multi-release mechanism for preventing liquid compression and gas overcompression.
A is moved to a suction side where the liquid refrigerant is easily sucked from a portion e opposed to the through hole 37 around the base circle 38 of the involute curve of the fixed wrap 16 as far as the compression balance is not broken. An angle Θ2 between a straight line f connecting the center of the base circle 38 and the point e and a straight line g connecting the center of the base circle 38 and the center of the through hole 37A is usually about 60 degrees at the maximum. By moving the through hole 37A to the suction side where the liquid refrigerant is easily sucked in a range that does not break the compression balance, the liquid compression prevention effect can be further enhanced.

In the above description of the present invention, the scroll compressor of the horizontal type has been described. However, the scroll compressor of the present invention is not limited to the horizontal type, and the scroll compressor of the vertical type is not limited to the horizontal type. Or other types of scroll compressors.

[0021]

The scroll type compressor according to the present invention has a simple structure of a multi-release mechanism for preventing liquid compression and gas over-compression, so that the cost is low and liquid compression and gas over-compression are prevented. It can be carried out easily and effectively, with high reliability and stable operation.

[Brief description of the drawings]

FIG. 1A is a rearmost end of the compression chamber immediately before the refrigerant gas in the compression chamber closest to the discharge port of the plurality of compression chambers of the scroll compressor according to the present invention communicates with the discharge port. FIG. 4B is an explanatory view showing a position b of the section, and FIG. 4B is an explanatory view showing a position d of the rearmost end of the compression chamber when the refrigerant gas in the compression chamber has a maximum volume.

FIG. 2 is an explanatory view showing positions of through holes of another scroll type compressor of the present invention.

FIG. 3 is a cross-sectional view showing an entire configuration of a conventional scroll compressor.

FIG. 4A is an explanatory view showing the position of a through hole of the conventional scroll compressor shown in FIG. 3, and FIG.
FIG. 4 is an explanatory view showing a release valve and the like.

5 (a) to (c) are explanatory views showing the progress of the compression of the refrigerant gas in the scroll compression element of the conventional scroll compressor shown in FIG.

FIGS. 6A to 6C are explanatory views showing the progress of compression of refrigerant gas in a scroll compression element of another conventional scroll compressor.

[Explanation of symbols]

 b Lubricating oil 1 Scroll compressor 1 Airtight container 2 Electric element 3 Scroll compression element 4 Stator 5 Rotor 6 Rotating shaft 7 Support frame 8 Oil supply section 9 Oil introduction pipe 10 Oil passage 11 Pin section 12 Oscillating scroll 13 Boss hole section 14 Swinging wrap 15 Fixed scroll 16 Fixed wrap 17, 17A Compression chamber 18 Suction pipe 19 Discharge port 20 Discharge pipe 21, 22 End plate 30 First suction port 31 Communication groove 32 Second suction port 33 Liquid compression prevention mechanism 34, 36, 37 , 37A Through hole 35 Release valve 38 Base circle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiko Mitsunaga 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kazugi Sugimoto 2-5-5 Sanyo Electric Co., Ltd. (72) Inventor Kazuya Sato 2-5-5 Sanyo Electric Co., Ltd., Sanyo Electric Co., Ltd. (72) Inventor Kazuaki Fujiwara Moriguchi, Osaka 2-5-5 Keihanhondori Sanyo Electric Co., Ltd.

Claims (4)

[Claims] An electric element and a scroll compression element driven by the electric element are provided in a closed container, and the scroll compression element has an involute curved fixed wrap on one side surface of a disk-shaped end plate, and a central portion. Forming a plurality of compression chambers by meshing a fixed scroll provided with a discharge port and a swing scroll having an involute curved swing wrap revolving by driving the electric element with respect to the fixed scroll, A scroll compressor that sequentially compresses the refrigerant gas sucked from outside the sealed container in the compression chamber, discharges the refrigerant gas into the sealed container through the discharge port, and then discharges the refrigerant gas to the outside of the sealed container; A hole penetrating from the compression chamber into the closed container and a release valve corresponding to the hole on the other side of the end plate to prevent liquid compression and gas overcompression. A scroll compressor having a multi-release mechanism for stopping. 2. The rearmost position of the compression chamber immediately before the refrigerant gas in the compression chamber located closest to the discharge port among the plurality of compression chambers communicates with the discharge port, and A hole of the multi-release mechanism is provided between the refrigerant gas and the rear end portion of the compression chamber having the maximum volume, and the multi-release mechanism is provided at a position opposed to a center circle of an involute curve of the fixed wrap. 2. The scroll compressor according to claim 1, wherein another hole of the mechanism is provided. 3. The multi-release mechanism according to claim 1, wherein one hole is provided near the discharge port side of the fixed wrap, and another hole is provided outside the discharge port of the fixed wrap. The scroll compressor according to claim 2. 4. The scroll-type compressor according to claim 2, wherein one hole of the multi-release mechanism is moved to a suction side where the liquid refrigerant is easily sucked in a range that does not break the compression balance.