JP3015016B2 - Check valve device for scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve for a scroll compressor, and more particularly, to a check valve of a piston type which is inserted into a housing of a cylinder type to provide stable vertical swing. The present invention relates to a check valve device for a scroll compressor that can improve efficiency by preventing abnormal noise during operation, and by closing a refrigerant discharge passage quickly when operation is stopped to prevent return of discharged gas. Things.

[0002]

2. Description of the Related Art Conventionally, in a general scroll compressor for an air conditioner and a refrigerator, a compressor unit 2 and an electric mechanism unit 3 are housed inside an airtight container 1 as shown in FIG. In addition, a suction pipe 4 is provided at an outer side wall portion of the closed container 1 and communicates with an external device such as an evaporator through the suction pipe 4.

In the compressor section 2, a fixed scroll 5, an orbiting scroll 6 engaged with the fixed scroll 5, a crankshaft 7 for driving the orbiting scroll 6, and a support for the crankshaft 7 are provided. And the upper frame 8 in which the orbiting scroll 6 is accommodated.

Further, spiral wraps 5a and 6a are formed on the fixed scroll 5 and the orbiting scroll 6, respectively, and the wraps 5a and 6a are engaged with each other.
It was formed in a general involute or in a curve approximating the involute. An Oldham ring 9 is provided between the orbiting scroll 6 and the upper frame 8 to prevent the orbiting scroll 6 from rotating, and a lower end of the orbiting scroll 6 is provided with a crankshaft 7 through a bearing 10.
The eccentric shaft portion 7a is engaged, and the orbiting scroll 6 performs an orbiting motion without rotating by the rotation of the crankshaft.

Further, the gas in the compression chamber is compressed by the orbiting scroll 6 and the fixed scroll 5, and the compressed gas passes through the discharge port 11 and the discharge chamber 12, and then the upper outer shell 13 on the side wall of the discharge chamber 12. Is discharged to the outside of the closed container 1 through a discharge pipe 14 penetrating through the container. The motor unit 3 includes a stator 15 fixed to an inner side wall of the closed casing 1 and a rotor 16 supported by the crankshaft 7.

A lower frame 19 for supporting a lower end of the crankshaft 7 is installed below the closed casing 1, and an oil pump 20 is mounted on the lower end of the crankshaft 7.
A lubricating oil storage chamber 18 is formed on the bottom surface of the closed container 1.
Is supplied to each mechanism by the rotation of the crankshaft 7.

An upper diaphragm 22 having a discharge port 22a is screwed onto the upper surface of the fixed scroll 5, and a check valve housing 23 corresponding to the discharge port 22a is engaged with a central upper surface of the upper diaphragm 22. The check valve 24 is engaged with the inside of the check valve housing 23. Hereinafter, an operation process of the conventional scroll compressor configured as described above will be described with reference to the drawings.

FIG. 12 is a view showing a refrigerant compression process according to a turning angle of the orbiting scroll 6, as shown in FIG.
When the wrap 6a of the orbiting scroll 6 moves at a point of 0 ° and separates from the outer wrap 5a of the fixed scroll 5 to form a suction passage, each scroll 5a is rotated by the turning angle of the refrigerant flowing through the suction passage. , 6 are compressed while collecting the two half-moon-shaped compression chambers 21 at the center of each scroll 5a, 6a.

Next, the compression chamber 21 gathered at the center reaches the discharge port 11 on the back surface of the fixed scroll 5 and is opened, and the compressed refrigerant gas passes through the discharge port 11 and the check valve housing on the upper diaphragm 22. 23, the check valve 24 is pushed upward, so that the upper diaphragm 2
After being discharged into the discharge chamber 12 between the outer shell 2 and the upper shell 13, it is discharged to an external device such as a condenser through a discharge pipe 14.

At this time, the high-pressure refrigerant gas passing through the discharge port 11 is discharged while floating the floating check valve 24 in the check valve housing 23 and opening the discharge port 22a of the upper diaphragm. During the discharge of the refrigerant in this manner, the check valve 24 is floated on the back surface of the check valve housing 23 by the refrigerant gas, so that the gas is discharged smoothly.

Thereafter, when the operation of the compressor is stopped and the discharge of the high-pressure refrigerant gas is interrupted, the check valve 24 floating on the back of the check valve housing 23 is stopped.
Quickly closes the discharge port 22a of the upper diaphragm and discharges the discharge chamber 1
The high-pressure gas in 2 is prevented from returning to the compression chamber of the scroll compressor, and the scroll and the motor unit are prevented from rotating in the reverse direction.

In this case, as shown in FIG. 10, the check valve 24 is mainly formed of a thin metal plate, and moves to the back of the check valve housing 23 during operation of the compressor. That is, the discharge gas at the moment of passing through the discharge pipe 14 is discharged from the discharge chamber 12 between the upper diaphragm 22 and the upper shell 13.
Although it is a gas of the internal discharge pressure Pd, the discharge gas actually at the moment of passing through the discharge port 11 of the fixed scroll 5 is discharged to the discharge pressure Pp higher than the discharge pressure Pd of the discharge chamber 12, The pressure on the lower surface becomes higher than the upper surface of the check valve 24, and the check valve 24 is floated and attached to the back surface of the check valve housing 23 as shown in FIG.

However, during operation of the compressor, the suction pressure Ps
When the pressure ratio (discharge pressure Pd / suction pressure Ps) increases, the pressure Pp at the start of discharge becomes lower than the discharge pressure Pd, and the check valve 24
As shown in FIG. 11 (B), at the point where it is separated from the back surface of the check valve housing 23 and overshot, it resurfaces in the U-shaped direction, and the rear surface and the inner side surface of the check valve housing 23 are moved. Attack.

[0014]

However, such a check valve of the conventional scroll compressor is formed in a thin plate shape and has a large cross-sectional area in the axial direction, so that a minute non-uniform pressure distribution is obtained. The check valve is eccentrically oscillated and collides with the inner side surface of the check valve housing to generate noise because the discharge gas passing through the discharge port is not evenly distributed over the entire surface of the check valve. There were disadvantages.

In addition, when the operation of the compressor is stopped, the check valve cannot quickly close the discharge port, and there is an inconvenience that noise is generated due to the reverse rotation of the compressor due to the reverse flow of gas. . Furthermore, for mass production of compressors,
When models are provided for different capacities, the operation method of the plate-like check valve differs for each model, so that all check valves must be manufactured for each model, resulting in a disadvantage that productivity is reduced. there were.

Accordingly, the present invention has been made in view of such a conventional problem, and a phenomenon in which a check valve is biased and oscillated due to a non-uniform pressure distribution during an operation to strike the check valve housing. It is an object of the present invention to provide a check valve device for a scroll compressor, which can prevent a reverse rotation phenomenon caused by a return of a discharge gas by rapidly closing a discharge passage when operation is stopped.

[0017]

In order to achieve the above object, a check valve device for a scroll compressor according to the present invention has an open bottom surface and is formed in a hollow cylindrical shape. Cylindrical housings 100, 200, 300, 400, 5 screwed into
00 and the housings 100, 200, 300, 40
0,500 piston-type check valves 110, 21 that are inserted into the inner or outer surface and swing up and down.
0, 310, 410, 510 and the housing 10
0, 200, 300, 400, and 500, and a ring-shaped receiving member 120 that is engaged between the upper surfaces of the fixed scrolls 5 to secure a refrigerant gas discharge passage.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. In the check valve device of the scroll compressor according to the first embodiment of the present invention, as shown in FIGS. 1 to 3, a cylindrical housing 100 is formed in a hollow cylindrical shape having an open lower surface,
Both sides of the outer peripheral surface of the housing 100 are extended in the horizontal direction, and a coupling hole 102 is formed in the extended portion,
A hole is formed in the center of the upper surface of the housing 100, and stoppers 101 are formed on both sides of the hole.

A cylindrical check valve 11 inserted into the housing 100 and swinging vertically.
0 is formed, a ring-shaped receiving member 120 is formed, the housing 100 is screwed into the center of the upper surface of the fixed scroll 5 via the receiving member 120 by a screw 130, and the check valve 110 is inserted into the housing 100. When the check valve 110 is swung up and down by the flow of the refrigerant, the swing of the check valve 110 is restricted by the stopper 101. Further, the receiving member 120 is formed in a ring shape lower than the height of the check valve 110.

In this case, in order to improve the productivity, a receiving member 120 may be integrally formed below the housing 100 and screwed to the upper surface of the fixed scroll 5. Also, the housing 100 is shown in FIGS.
As shown in (B), a lower housing part 100a having a vertically penetrated hole, and the lower housing part 100a
The upper housing portion 100b, which is formed to be smaller than the hole of the lower housing portion 100a so as to limit the upward movement of the check valve 110 by being engaged with the upper surface of the upper housing portion 100b.
And can be configured separately.

Hereinafter, the first embodiment of the present invention configured as described above will be described.
The operation of the scroll compressor check valve device according to the embodiment will be described. First, the compressed refrigerant gas in the compression chamber formed by the wrap (not shown) of the fixed scroll 5 and the orbiting scroll 6 (not shown) passes through the discharge port 11 of the fixed scroll 5 and the piston type check valve 110. Is discharged while floating.

At this time, the check valve 110 is
The housing 100 rises along the inner wall of the cylinder housing 100 and operates during the operation of the compressor.
Because it is abutted against the stopper part 101 of
The discharge gas is discharged along a passage only at the height of the receiving member 120.

Next, when the compressor stops operating, the pressure of the discharge gas filled in the discharge chamber 12 passes through the central through hole of the cylindrical housing 100 and the check valve 1
10 to apply pressure to the upper surface of the check valve 1
Reference numeral 10 quickly closes the discharge port 11 to prevent backflow of the discharge gas.

In a check valve device for a scroll compressor according to a second embodiment of the present invention, FIG.
As shown in (A) and (B), contrary to the first embodiment, the check valve 210 is covered from the outside of the cylindrical housing 200.

That is, the housing 200 is formed in a cylindrical shape with both upper and lower surfaces opened, and a plurality of discharge holes 201 are formed in the side wall of the housing 200 so as to discharge the discharge gas. A ring-shaped stopper 202 for restricting the elevation of the check valve 210 is formed on the outer peripheral edge of the upper surface of the housing 200, and both outer peripheral edges of the housing 200 are formed to extend in the horizontal direction, and the housing 200 is fixed to the extended portion. 5 are respectively formed with perforations.

The check valve 210 is formed in a hollow cylindrical shape having an open lower surface, and has a ring-shaped member on the inner wall of the lower surface of the check valve 210 for limiting the upward movement of the check valve 210. A stop ridge 211 is formed, and is locked by the stopper portion 202 of the housing 200 when swinging upward.

Hereinafter, the second embodiment of the present invention configured as described above will be described.
The operation of the scroll check valve device according to the embodiment will be described. The refrigerant gas compressed in the compression chamber is discharged through the discharge port 11 of the fixed scroll 5 and causes the check valve 210 to float.
The stopper ridge 211 of the check valve is locked by the stopper portion 202 of the housing 200 and is restricted. At this time, the refrigerant gas is discharged through the discharge hole 201 of the housing 200.

When the operation of the compressor is stopped, the pressure of the discharge gas filled in the discharge chamber becomes equal to the pressure of the check valve 2.
10 and thus the check valve 21
0 closes the discharge hole 201 of the housing 200 to prevent backflow of the discharge gas.

Further, in the check valve device of the scroll compressor according to the third embodiment of the present invention, FIG.
As shown in (A) and (B), a ring-shaped housing 300 whose upper and lower surfaces are open is formed, and a cylindrical check valve 310 which is inserted into the housing 300 and swings vertically is formed. A locking ridge 311 having a diameter larger than the inner diameter of the housing 300 is formed at the lower end of the check valve 310, and the locking ridge 311 restricts upward swing of the check valve 310. It is configured as follows.

At this time, the housing 300 is screwed to the upper surface of the fixed scroll 5 via the receiving member 120 with a screw, and the refrigerant is discharged through a discharge passage formed at a height of the receiving member 120. Unexplained reference numeral 30 in the figure
Reference numeral 1 denotes a coupling hole for fixing to the fixed scroll 5 as in the first embodiment. The operation of the check valve device of the scroll compressor according to the third embodiment of the present invention, which is configured as described above, is the same as that of the first embodiment, and will not be described.

In the check valve device of the scroll compressor according to the fourth embodiment of the present invention, as shown in FIGS. 7A and 7B, the upper surface of a hollow cylindrical housing 400 is formed. A plurality of refrigerant discharge holes 401 are respectively formed in the side wall surface of the housing 400 so as to be sealed, and a cylindrical check valve 410 is inserted into the housing 400 so as to swing vertically. ing.

Hereinafter, the fourth embodiment of the present invention will be described.
The operation of the check valve device of the scroll compressor according to the embodiment will be described. First, the refrigerant gas compressed in the compression chamber is discharged through the discharge port 11 of the fixed scroll 5, causing the check valve 410 to float.
The check valve 410 is floated up to the upper rear surface of the housing 400, and the discharge gas is discharged through each discharge hole 401 in the side wall of the housing 400.

Next, when the compressor stops operating, the discharge of the discharge gas is interrupted, and the check valve 410 floated by the discharge gas descends by its own weight,
The discharge port 11 of the fixed scroll 5 is closed and the discharge hole 4 is closed.
01 is closed to prevent backflow of the discharge gas.

In a check valve device for a scroll compressor according to a fifth embodiment of the present invention, FIG.
As shown in (A) and (B), a hollow cylindrical housing 500 having a hole formed in the upper surface and an open lower surface.
Is formed, and a hollow conical check valve 510 having an inclined portion 511 is formed.
A plurality of discharge holes 511a are formed in the inclined portion 511.

A stopper 501 is formed on the upper surface of the housing 500 to limit the upward movement of the check valve 510 by the hole.
Both sides of the outer peripheral surface are formed to extend in the horizontal direction, and a coupling hole 502 for engaging the housing 500 with the fixed scroll 5 is formed in the extended portion. Hereinafter, the operation of the thus-configured check valve device of the scroll compressor according to the fifth embodiment of the present invention will be described.

That is, the discharge port 11 of the fixed scroll 5
Check valve 510 by the discharge gas discharged through
However, the upward movement of the check valve 510 is restricted by being stopped by the stopper portion 501 at the upper end of the cylinder type housing 500. At this time, the discharge gas is supplied to the inclined portion of the check valve 510. The liquid is discharged through each of the discharge holes 511a. Next, when the operation of the compressor is stopped, the discharge gas charged on the discharge side passes through the central through hole of the housing 500 and applies pressure to the upper surface of the check valve 510.
10 quickly closes the discharge port 11 to prevent backflow of the discharged gas.

[0037]

As described above, in the check valve device of the scroll compressor according to the present invention, since the piston type check valve is mounted, the check valve can be properly moved in the vertical direction without bias in the housing. This has the effect of preventing abnormal noise by swinging, and closing the discharge port quickly when operation is stopped to prevent backflow of the discharge gas.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an assembled state of a check valve device of a scroll compressor according to the present invention.

FIG. 2 is a cross-sectional view showing a state where the check valve device according to the present invention is screwed into a fixed scroll.

3A and 3B are drawings showing a check valve device according to a first embodiment of the present invention, wherein FIG. 3A is a plan view and a sectional view of a housing, FIG. 3B is a plan view and a front view of a check valve, and FIG. (C) is a plan view and a sectional view of the receiving member.

4A and 4B are a plan view and a cross-sectional view showing another example of the housing of FIG. 3, wherein FIG. 4A shows a lower housing, and FIG. 4B shows an upper housing.

FIG. 5 is an exploded plan view and a sectional view of a check valve device of a scroll compressor according to a second embodiment of the present invention, where (A) shows a housing and (B) shows a check valve. I have.

FIG. 6 is an exploded plan view and a sectional view of a check valve device of a scroll compressor according to a third embodiment of the present invention, wherein (A) shows a housing and (B) shows a check valve. I have.

FIG. 7 is an exploded plan view and a sectional view of a check valve device of a scroll compressor according to a fourth embodiment of the present invention, wherein (A) shows a housing and (B) shows a check valve. I have.

8A and 8B are a plan view and a sectional view showing a check valve device of a scroll compressor according to a fifth embodiment of the present invention, wherein FIG. 8A shows a housing, and FIGS. 8B and 8C show check valves. I have.

FIG. 9 is a cross-sectional view showing the structure of a conventional scroll compressor.

FIG. 10 is a partial cross-sectional view illustrating a configuration of a gas discharge unit of a conventional scroll compressor.

FIG. 11 is a longitudinal sectional view showing the operation of a conventional check valve device of a scroll compressor, where (A) shows a floating state of the check valve and (B) shows an abnormal operation state of the check valve. .

FIG. 12 is an explanatory diagram showing a compression principle of a scroll compressor.

[Explanation of symbols]

5: fixed scroll 11: discharge port 100, 200, 300, 400, 500 ... housing 110, 210, 310, 410, 510 ... check valve 101, 202, 501 ... stopper 102, 203, 301, 402, 502 ... connecting hole 120: receiving member 201, 401, 511a: discharge hole 211, 311: locking ridge 511: inclined portion

Continuation of the front page (56) References JP-A 1-313693 (JP, A) JP-A 1-61484 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18 / 02 311

Claims (10)

(57) [Claims] 1. A cylinder-shaped housing formed in a hollow cylindrical shape having an open lower surface and screwed to an upper side of a fixed scroll, and inserted into an inner or outer surface of the housing to swing vertically. A piston-type check valve that moves, a lower surface of the housing, and a ring-shaped receiving member that is engaged between the upper surface of the fixed scroll and that secures a refrigerant gas discharge passage. Check valve device for scroll compressor. 2. The check valve device for a scroll compressor according to claim 1, wherein the receiving member is integrally formed on both sides of a lower surface of the housing. 3. The check valve device for a scroll compressor according to claim 1, wherein the receiving member is formed lower than a height of the check valve. 4. The housing has a hole formed at the center of the upper surface of the housing, and a stopper for limiting upward swing of the check valve is formed at an edge of the housing. Each is formed to extend in the horizontal direction, and a connection hole is formed in each of the extended portions,
The check valve device for a scroll compressor according to claim 1, wherein the housing is screwed to the fixed scroll via the connection holes. 5. The check valve according to claim 1, wherein the check valve is formed in a substantially hollow inverted conical shape having an inclined portion, and a plurality of refrigerant discharge holes are formed in the inclined portion. A check valve device for the scroll compressor according to the above. 6. The housing according to claim 1, wherein the housing includes a lower housing into which the check valve is inserted, and an upper housing that restricts upward swing of the check valve.
A check valve device for the scroll compressor according to the above. 7. The check valve according to claim 1, wherein a locking ridge is formed on a lower surface of the check valve so as to limit swinging up and down along an inner surface of the housing.
A check valve device for the scroll compressor according to the above. 8. The housing is formed in a cylindrical shape having upper and lower surfaces open, and a ring-shaped stopper is formed outwardly of an outer peripheral edge of an upper end.
2. The check valve device for a scroll compressor according to claim 1, wherein the upward swing of the check valve inserted into the outer surface of the housing is restricted. 9. The check valve is formed in a hollow cylindrical shape with an open lower surface, and an inner edge of the open lower surface is bent and extended in a horizontal direction to form a ring-shaped locking ridge. When the check valve is inserted into the outer surface of the housing and swings up and down, the locking ridge is locked by the stopper to limit upward swinging. The check valve device for a scroll compressor according to claim 1 or 8, wherein: 10. The housing is formed in a hollow cylindrical shape whose upper surface is closed and whose lower surface is open. A plurality of refrigerant discharge holes are formed in a side wall of the housing, respectively. Formed to extend in the horizontal direction,
The check valve device for a scroll compressor according to claim 1, wherein coupling holes for screwing and fixing to the fixed scroll are formed in the extension portions, respectively.