JP2001221173A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor capable of preventing excess compression caused by delay of the breakage of an oil film even if a valve seat area is ensured. SOLUTION: In the scroll compressor for forming an oil film while a delivery valve for closing the delivery port 111 tightly fitting to a surface of a valve seat 114 and for opening the delivery port 111 receiving fluid pressure compressed by a scroll compression mechanism, is tightly fitted to a surface of the valve seat 114; a groove 125 is disposed on a surface of the valve seat 114.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used for compressing a refrigerant in a refrigeration cycle and the like.
The present invention relates to a structure of a discharge mechanism in a scroll compressor.

[0002]

2. Description of the Related Art An example of a conventional scroll compressor will be briefly described with reference to FIGS. FIG. 5 is a cross-sectional view of a horizontal scroll compressor that is used in a vehicle air conditioner and compresses a refrigerant, and FIG. 6 is a view taken along the line EE in FIG. 5 and 6, a scroll-type compression mechanism C, which will be described later, is housed and installed in a sealed housing H composed of a front housing 4 and a rear housing 5. An electromagnetic clutch MC for interrupting the driving power of the scroll compressor is installed at the front end outer portion of the front housing 4, and these are directly connected to each other via a rotating shaft 6.

The scroll-type compression mechanism C includes a fixed scroll 1, an orbiting scroll 2, an Oldham link 3 which allows the orbiting orbiting movement of the orbiting scroll 2 but prevents its rotation, a main bearing 7 which supports the rotating shaft 6, and the like. Be composed. The fixed scroll 1 is fastened to the rear housing 5. The fixed scroll 1 has an end plate 8 and a spiral wrap 9 erected on the inner surface thereof, and a discharge port 11 is provided at the center of the end plate 8. The discharge port 11
A discharge port 11 is provided on the outer peripheral surface of the end plate 8 provided with
And a discharge valve 12 having elasticity for opening and closing the discharge port 11 in close contact with the valve seat 14 and a retainer 13 for limiting a movable range of the discharge valve 12. Is installed. Note that the discharge valve 12 and the retainer 13 are fixed to the end plate 8 with bolts 15.

The orbiting scroll 2 has an end plate 16 and a spiral wrap 17 standing upright on its inner surface. End plate 1
An eccentric bush 19 is provided in a boss 18 erected on the outer surface of
Are rotatably fitted via a swivel bearing 20, and an eccentric pin 21 projecting from the end of the rotating shaft 6 is rotatably fitted into a hole formed in the eccentric bush 19. A plurality of closed spaces 22 are formed by eccentrically interlocking the fixed scroll 1 and the orbiting scroll 2 with each other by a predetermined distance and shifting the angle by 180 degrees.

[0005] The front housing 4 is a rear housing 5
The thrust surface 23 formed on the inner end surface of the front housing 4 and the rear surface of the orbiting scroll 2 are in sliding contact with each other to support the orbiting scroll 2. When power is transmitted from the electromagnetic clutch MC to the rotating shaft 6, the orbiting scroll 2 is rotated by the Oldham link 3 via a revolving orbiting mechanism including the rotating shaft 6, the eccentric pin 21, the eccentric bush 19, and the boss 18. While being blocked, it revolves around a circular orbit of the revolving radius. Therefore, the refrigerant gas flows from the suction port 10 to the closed housing H.
Into the closed space 22 through a gas passage (not shown).
Inhaled into. The refrigerant gas reaches the central portion while being compressed as the volume of the closed space 22 decreases due to the revolving orbiting motion of the orbiting scroll 2, and reaches the fixed scroll 1.
The discharge valve 12 is pushed open from the discharge port 11 provided in the end plate 8 to enter the discharge cavity 24, from which it is discharged to the outside.

[0006]

In the above-described conventional scroll compressor, the discharge valve 12 and the end plate 8 are not provided.
Between the discharge port 11 and the discharge cavity 24 by an oil film formed between the discharge port 11 and the valve seat 14, the pressure in the compression chamber of the scroll compressor including the discharge port 11 increases, and The high pressure compressed gas is discharged by breaking the oil film with the lifting. in this case,
If the breaking of the oil film formed between the discharge valve 12 and the valve seat 14 is delayed, the refrigerant gas is excessively compressed in the compression chamber of the compressor including the discharge port 11. When such a phenomenon occurs, there is a problem that the discharge pressure loss of the refrigerant gas increases, the driving force of the scroll compressor increases, and the efficiency decreases. In order to avoid such excessive compression of the refrigerant gas, it is effective to reduce the area of the valve seat 14. However, reducing the area of the valve seat 14 causes a problem of wear. For this reason, the fact is that the area of the valve seat 14 must be ensured in consideration of prevention of wear.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a scroll compressor capable of preventing excessive compression due to a delay in oil film breakage even when a valve seat area is secured.

[0008]

The present invention employs the following means in order to solve the above-mentioned problems. The scroll compressor according to claim 1, wherein the discharge port closes the discharge port in close contact with the valve seat surface, and the discharge valve that opens the discharge port in response to the fluid pressure compressed by the scroll type compression mechanism is in close contact with the valve seat surface. In a scroll compressor in which an oil film is formed during the operation, a groove is provided on the surface of the valve seat.

According to such a scroll compressor, the thickness of the oil film formed between the discharge valve and the valve seat surface is unbalanced due to the presence of the concave groove portion. The oil film breaks easily. The concave groove portion in this case may be a radial groove provided at least one in the radial direction so as to communicate with the discharge port from the outer peripheral portion of the valve seat, or from the outer peripheral portion of the valve seat to the discharge port. One or more radiation grooves may be provided in a part of the communicating radial direction. Further, the concave groove portion may include a circular groove concentric with the valve seat, and one or more radiation grooves communicating the circular groove with an outer peripheral portion of the valve seat.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a scroll compressor according to the present invention will be described below with reference to FIGS. FIG. 2 is an enlarged sectional view of a main part of a fixed scroll showing a discharge valve mounting portion according to the present invention, and FIG.
1A is a cross-sectional view taken along line BB of FIG. 1A. In FIGS. 1 and 2, reference numeral 111 denotes a discharge port provided on the end plate 108 of the fixed scroll;
Reference numeral 12 denotes a discharge valve having elasticity provided to open and close the discharge port 111, and reference numeral 113 denotes a retainer for limiting a movable range of the discharge valve 112.

The discharge valve 112 and the retainer 113 are
Both are fixed to the end plate 108 by bolts 115. Reference numeral 114 denotes a valve seat.
Is a circular shape concentric with the discharge port 111 provided on the outer surface of. On the surface (seal surface) of the circular valve seat 114, a radially narrow radial groove 125 communicating from the outer peripheral portion to the discharge port 111 is provided. In the example shown, 1
Although two radiation grooves 125 are provided, two or more radiation grooves may be provided. That is, the concave groove portion in the present embodiment is configured by the groove 125.

The discharge port 111 to which the discharge valve 112 is in close contact
Of the valve seat 114 and the discharge port 1
Since one or more narrow grooves 125 in the radial direction are formed to communicate with the fluid 11, the oil film formed between the discharge valve 112 and the valve seat 114 becomes unbalanced in oil film thickness. Therefore, when the pressure in the compression chamber of the scroll compressor including the discharge port 111 increases, the oil film easily breaks,
Excessive compression of the main compression chamber gas due to the delay of the oil film breakage is eliminated, the discharge pressure loss at the time of discharging the compressed gas can be reduced, the power of the scroll compressor can be reduced, and the efficiency can be increased. Further, the groove 1 formed in the valve seat 114
Since the width of the valve seat 25 may be sufficiently smaller than the area of the valve seat 114, an area for preventing the valve seat 114 from being worn can be easily secured.

Next, a second embodiment of the present invention will be described with reference to FIGS. In this case, similarly to the above-described first embodiment, a thin groove 1 in the radial direction is formed on the outer surface of the valve seat 114 concentric with the discharge port 111 from the outer periphery thereof.
One or more holes 26 are formed so as not to penetrate the discharge port 111. In the illustrated example, eight grooves 126 are formed radially at a pitch of 45 degrees.
6 is also provided from the outer peripheral part to the middle of the valve seat 114.
Therefore, the groove 1 is provided in the valve seat 114 around the discharge port 111.
26, and a plane is formed. That is, the concave groove portion in the present embodiment is configured by the groove 126.

According to the structure of the second embodiment, the valve seat 1 of the discharge port 111 to which the discharge valve 112 is in close contact.
14, a thin groove 1 in the radial direction from the outer peripheral portion of the valve seat 114.
Since one or more holes 26 are formed so as not to penetrate the discharge port 111, the oil film formed between the discharge valve 112 and the valve seat 114 has an imbalance in oil film thickness. Therefore, when the pressure in the compression chamber of the scroll compressor including the discharge port 111 rises, the oil film easily breaks, so that excessive compression of the gas in the compression chamber due to the delay of the oil film break is eliminated, and the discharge pressure at the time of discharging the compressed gas is reduced. The loss can be reduced, the power of the scroll compressor is reduced, and the efficiency can be increased. Also, a groove 126 formed in the valve seat 114 is formed.
May be sufficiently smaller than the area of the main valve seat 114, so that an area for preventing the valve seat 114 from being worn can be easily secured.

Finally, a third embodiment of the present invention will be described with reference to FIGS. In this case, the valve seat 1 concentric with the discharge port 111 as in the first embodiment described above.
A thin circular groove 127 concentric with the main valve seat 114 is formed in the outer surface of the valve seat 14, and one or a narrow groove 128 communicating the main circular groove 127 with the outer peripheral portion of the valve seat 114 is provided. Drill it above. In the illustrated example, one circular groove 127 is used.
And two grooves 128 located on a straight line. That is, the concave groove portion in the present embodiment is constituted by the circular groove 127 and the groove 128.

With such a configuration of the third embodiment,
The valve seat 114 of the discharge port 111 to which the discharge valve 112 is in close contact
In addition, a thin circular groove 127 concentric with the main valve seat 114 and one or more narrow grooves 128 communicating the main circular groove 127 and the outer peripheral portion of the valve seat 114 are formed.
An unbalance of the oil film thickness occurs in the oil film formed between the fourteen. Therefore, when the pressure in the compression chamber of the scroll compressor including the discharge port 111 rises, the oil film easily breaks, so that excessive compression of the gas in the compression chamber due to the delay of the oil film break is eliminated, and the discharge pressure at the time of discharging the compressed gas is reduced. The loss can be reduced, the power of the scroll compressor is reduced, and the efficiency can be increased. Also, the valve seat 114
Circular groove 127 and main circular groove 127 and valve seat 11
The width of the narrow groove 128 communicating with the outer peripheral portion of the valve seat 1 is
14 may be sufficiently small with respect to the area of the valve seat 114.
Thus, an area for preventing abrasion can be easily secured.

The present invention is not limited to the above-described first to third embodiments, and various modifications are possible. For example, the discharge port 11
Groove 125 (see FIG. 1) penetrating to 1 and groove 1 not penetrating
26 (see FIG. 3), or a combination of a circular groove 127 (see FIG. 4) and a groove 125 (see FIG. 1) penetrating from the outer peripheral portion to the discharge port 111. Further, the grooves 125 and 126 are not necessarily limited to straight lines in the radial direction, but may be spiral.

[0018]

According to the above-described scroll compressor of the present invention, since the groove is formed in the valve seat of the discharge port where the discharge valve is in close contact, the groove is formed between the discharge valve and the valve seat due to the presence of the groove. The resulting oil film has an unbalanced oil film thickness.
For this reason, when the pressure in the compression chamber of the scroll compressor including the discharge port rises, the oil film easily breaks, so that excessive compression of the gas in the compression chamber due to the delay of the oil film break is eliminated, and the discharge during the discharge of the compressed gas is stopped. Pressure loss can be reduced. Therefore, it is possible to reduce the power of the scroll compressor and increase the efficiency. Further, since the recessed groove formed in the valve seat may be sufficiently small with respect to the area of the valve seat, an area for preventing the wear of the valve seat can be easily secured, and the durability is excellent. It works.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a scroll compressor according to the present invention, wherein (a) shows a first embodiment and FIG.
FIG. 2B is a cross-sectional view taken along the line BB of FIG.

FIG. 2 is an enlarged sectional view of a main part of a fixed scroll showing a discharge valve mounting part of the scroll compressor according to the present invention.

FIG. 3 is a view showing one embodiment of a scroll compressor according to the present invention, wherein (a) shows a second embodiment and FIG.
FIG. 2B is a cross-sectional view taken along line C-C of FIG.

FIG. 4 is a view showing an embodiment of a scroll compressor according to the present invention, wherein (a) shows a third embodiment and FIG.
(B) is a cross-sectional view taken along line DD in (a).

FIG. 5 is a sectional view showing a conventional scroll compressor.

6 is a view as viewed in the direction of arrows EE in FIG. 5;

[Explanation of symbols]

 108 End plate 111 Discharge port 112 Discharge valve 113 Retainer 114 Valve seat 125, 126, 128 Groove (concave groove) 127 Circular groove (concave groove)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H039 AA02 AA12 BB04 BB17 CC27 CC29 CC30

Claims (4)

[Claims] An oil film is formed while a discharge valve that opens a discharge port by receiving a fluid pressure compressed by a scroll-type compression mechanism is in close contact with the valve seat surface. A scroll compressor according to claim 1, wherein a groove is provided on a surface of said valve seat. 2. The scroll compressor according to claim 1, wherein the concave groove portion is a radial groove provided in the radial direction so as to communicate with the discharge port from an outer peripheral portion of the valve seat. 3. The scroll compressor according to claim 1, wherein the concave groove portion is a radial groove provided at least in a part in a radial direction from the outer peripheral portion of the valve seat to the discharge port. . 4. The concave groove portion has a circular groove concentric with the valve seat, and the circular groove communicates with the outer peripheral portion of the valve seat.
The scroll compressor according to claim 1, comprising the above-mentioned radiation groove.