JPH11166488A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor which can prevent breakage of a check valve by improving the check valve and the exhaust hole in a top plate. SOLUTION: A scroll compressor includes a container, motor, and compression unit. The motor has an eccentric shaft, while the compression unit has revolving scroll revolved by the eccentric shaft of the motor, stationary scroll positioned confronting the revolving scroll to form a compression space, and a top plate 140 to secure the stationary scroll to the container. The stationary scroll has a discharge hole for compressed refrigerant and a stable installation part where a check valve 130 capable of moving in the vertical direction for opening and closing the discharge hole is installed stably. The top plate 140 is furnished with a cruciform exhaust hole 141 positioned on the stable installation part. The stable installation part and exhaust hole 141 have a part from which the refrigerant discharged through the discharge hole is exhausted through the stable installation part and the exhaust hole 141. Because of circular shape of check valve 130, it is possible to prevent deflection, cracking, or breakage resulting therefrom.

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 refrigerator or an air conditioner.

[0002]

2. Description of the Related Art Recently, scroll compressors having more excellent compression efficiency have been frequently used in a cooling cycle of a cooling device such as a refrigerator or an air conditioner. Such a scroll compressor, as shown in FIG.
(Fixed croll) and orbiting scroll 20, a compression unit 1, a motor 2 for providing a driving force necessary for operation of the compression unit 1, a container 3 for accommodating the compression unit 1 and the motor 2, and the like. I have. this house,
The fixed scroll 10 of the compression unit 1 has a discharge hole (discha).
end plate 1 with rge hole 13
1 and a spiral wrap 12 extending downward from the end plate 11, and is fixed to the container 3 by the top plate 40.

[0003] And an orbit scroll
Reference numeral 20 denotes an end plate 21 and the end plate 21
Extending upward from the wrap 12 of the fixed scroll 10
The center axis of the spiral wrap 22 is connected to the eccentric shaft 2a of the motor 2 so as to revolve around the center axis of the fixed scroll 10. In the compression unit 1 configured as described above, the refrigerant gas revolves around the central axis of the fixed scroll 10 so that the refrigerant gas is supplied to the spiral wrap 12 and the spiral wrap 22.
Is sucked into the compression space. As shown in FIGS. 2 to 5, the refrigerant drawn into the compression space is compressed and then discharged through the discharge holes 13 formed in the end plate 11 of the fixed scroll 10.

Further, the compression unit 1 is provided with a check valve 30 for opening and closing the discharge hole 13, which is for preventing the compressed refrigerant discharged through the discharge hole 13 from flowing backward. More specifically, as shown in FIG. 6 to FIG.
Has a large number of legs (le
g) End plate 1 having a shape with 32 attached
1 is seated on a valve seating portion 14 formed so as to be communicated with the discharge hole 13. In the top plate 40, a release hole 41 having a diameter larger than the diameter of the circular plate 31 of the check valve 30 and smaller than the diameter of the check valve 30 including the legs 32 is formed.

Along with this, the check valve 30 in the closed state as shown in FIG.
When the compressed refrigerant is discharged through the discharge hole 13 in the compression space between the two, the refrigerant is lifted upward and opened by the discharge pressure as shown in FIG. Check valve 30
As a result, the compressed refrigerant is discharged to the discharge chamber 1a through the discharge hole 41. The rising width of the check valve 30 is limited by the leg 32 of the check valve 30 covering a part of the top plate 40 defining the discharge hole 41. And
When the compressed refrigerant is completely discharged, the check valve 30 is closed again, thereby preventing the discharged compressed refrigerant from flowing backward.

In FIG. 1, reference numerals 4 and 5 denote a suction pipe and a discharge pipe, respectively, and 6 denotes a bottom (BOTTOM) plate for supporting one end of an eccentric shaft 2a of the motor 2. However, in the related art, when the check valve 30 repeatedly opens and closes while moving up and down, the leg 32 is bent due to a pressure difference between the compression space and the discharge chamber 1a, and when severe, the check valve 30 is cracked and damaged. There was a point.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a scroll compressor in which the discharge holes of a check valve and a top plate are improved to prevent the check valve from being damaged.

[0008]

A scroll compressor according to the present invention for achieving the above object comprises a container,
Includes motor and compression unit. The motor has an eccentric shaft, and the compression unit has an orbiting scroll turned by the eccentric shaft of the motor, a fixed scroll facing the orbiting scroll to form a compression space, and a top plate for fixing the fixed scroll to the container. . The fixed scroll has a discharge hole for discharging the compressed gas refrigerant, a vertically movable check valve for opening and closing the discharge hole, and a seating portion communicating with the discharge hole. The top plate has a cross-shaped discharge hole located above the seating portion. A portion of the top plate is located above the check valve to restrain the check valve within the seat. The check valve has a circular plate shape. The seating portion and the discharge hole have a portion located outside the check valve at right angles to the check valve through which the refrigerant discharged through the discharge port is discharged through the seating portion and the discharge hole.

Here, it is desirable that the discharge hole has a cross shape. Preferably, the seating portion includes a cylindrical portion and a slot extending outward from the cylindrical portion and communicating with the discharge hole, and the check valve is seated on the cylindrical portion. Thus,
The gas refrigerant compressed in the compression space between the fixed scroll and the orbiting scroll moves the check valve upward and is discharged through the discharge hole. The gas refrigerant discharged from the discharge hole is discharged through the seat and the discharge hole which are not closed by the check valve. According to the present invention, since the check valve has a circular plate shape,
The rigidity is greatly increased compared to the conventional case having legs.

[0010]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The scroll compressor according to the present invention has the same structure as the general scroll compressor shown in FIGS. 1 to 5 except for the second end plate 111, the top plate 140, and the check valve 130.

The scroll compressor according to the present invention, as shown in detail in FIGS.
In the second end plate 111, a discharge hole 113 and a seating portion 114 are formed. The seating portion 114 has a cylindrical central portion 114a and a plurality of side slots 114b each having an inclined surface 114c. The gas refrigerant compressed in the compression space between the second wrap 112 and the first wrap 122 is discharged through the discharge hole 113. In order to open and close the discharge hole 113, the check valve 130, which is vertically movable at the seating portion 114, has a circular plate shape and is located at the cylindrical central portion 114 a of the seating portion 114.

A cross, more specifically, a leg is overlapped on each slot 114b on the top plate 140 at a position corresponding to the upper side of the seating portion 114, and a cross-shaped discharge hole 141 having a circular inside is formed. It is formed. Since the discharge hole 141 has a circular shape and each leg of the cross has a length greater than the diameter of the check valve 130, the compressed refrigerant is discharged through the open portion of the discharge hole 141 after the check valve 130 is raised.

Even if the shape of the discharge hole 141 is shown in a cross shape in the drawings, the shape of the discharge hole 141 is not necessarily limited to this, and may be a perfect cross shape or an elliptical shape, a triangular shape, or a star shape. It can be made in a variety of shapes. However, this discharge hole 141 should have at least one portion whose radius is larger than the radius of the check valve. In the seating portion 114, a portion corresponding to the cross portion of the discharge hole 141 is also formed in a cross shape.

The operation of the check valve 130 of the scroll compressor according to the present invention will now be described. FIG. 11 is a sectional view showing a state where the check valve is closed. As shown, check valve 13
0 closes the discharge hole 113. When the suction gas refrigerant is compressed by the revolution of the orbiting scroll (not shown), the refrigerant compressed in the compression space between the first wrap 122 and the second wrap 112 applies pressure to the check valve 130. Become. The check valve 130 moves upward due to the pressure of the compressed refrigerant, and the discharge hole 113 is opened (see FIG. 12).

The corner 140 a of the top plate 140 allows the check valve 130 to remain in the seat 114. The compressed refrigerant discharged through the opened discharge hole 113 is discharged to the discharge chamber of a container (not shown) through the inclined surface of the seating portion 114, the side slot 114b outside the check valve 130, and the discharge hole 141, and is again discharged to the discharge pipe. (Not shown) to the outside. At this time, the discharge holes 14
The rising width of the check valve 130 is limited by the inner part of the check valve 130. When the discharge of the compressed refrigerant is completed, the check valve 130 moves downward again to close the discharge hole 113.

[0016]

As described above, according to the present invention, since the check valve has a circular plate shape, the rigidity is further increased as compared with the conventional case. Therefore, there is an advantage that the conventional check valve can be prevented from being bent or cracked or damaged due to this.

While the above has been illustrated and described with respect to a particular preferred embodiment of the invention, the invention is not limited to the one embodiment and does not depart from the gist of the invention as set forth in the appended claims. Anyone having ordinary knowledge in the field to which the present invention belongs can be subjected to various modifications.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a general scroll compressor.

FIG. 2 is a plan view taken along the line II-II in FIG. 1 and showing a compression principle of the scroll compressor.

FIG. 3 is a plan view taken along the line II-II of FIG. 1 and showing a compression principle of the scroll compressor.

FIG. 4 is a plan view taken along the line II-II of FIG. 1 and showing the principle of compression of the scroll compressor.

FIG. 5 is a plan view taken along the line II-II of FIG. 1 and showing the compression principle of the scroll compressor.

FIG. 6 is a plan view showing a conventional check valve and a discharge hole adopted in the general scroll compressor shown in FIG.

FIG. 7 is a cross-sectional view showing a state where the conventional check valve of FIG. 3 is closed.

FIG. 8 is a sectional view showing a state where the conventional check valve of FIG. 3 is opened.

FIG. 9 is a plan view showing a top plate according to an embodiment of the present invention.

FIG. 10 is a partial plan view of an end plate of the fixed scroll according to the present invention.

FIG. 11 is a sectional view showing a state in which the check valve of FIGS. 9 and 10 is closed.

FIG. 12 is a cross-sectional view showing a state where the check valve of FIGS. 9 and 10 is open.

[Explanation of symbols]

 113 discharge hole 130 check valve 140 top plate 140a corner 141 discharge hole

Claims (3)

[Claims] 1. A container having a suction pipe and a discharge pipe, a motor provided inside the container and having an eccentric shaft, a orbiting scroll orbited by the eccentric shaft of the motor, and a compression opposed to the orbiting scroll. Form a space,
A discharge hole for discharging the gas refrigerant compressed in the compression space, a seating part communicated with the discharge hole, and a check valve seated vertically movable on the seating part for opening and closing the discharge hole. By fixing the fixed scroll with respect to the container, a discharge hole formed above the seating portion is formed, and a part placed above the check valve is provided with the check valve. A compression unit having a top plate constrained in the seating portion, wherein the check valve is circular, and the seating portion and the discharge hole are configured so that the refrigerant discharged through the discharge port is discharged. A scroll compressor having a portion located on the outside in the radial direction of the scroll compressor. 2. The scroll compressor according to claim 1, wherein the discharge hole has a cross shape. 3. The seating portion includes a cylindrical portion, a slot extending outward from the cylindrical portion and communicating with the discharge hole, and the check valve is seated on the cylindrical portion. The scroll compressor according to claim 2.