JPH1018987A - Discharge valve structure for rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise the closing speed of the discharge valve of a rotary compressor to improve the compression efficiency. SOLUTION: A rotary compressor has a discharge port 12 in the inner periphery of a cylinder in parallel with a shaft, to discharge therethrough a refrigerant in the direction perpendicular to the shaft. A valve plate 14 for opening or closing the discharge port 12 is curved, and a valve-fitting surface 15a on which the valve plate 14 is fitted is arranged nearer to the inner periphery of the cylinder than a valve seat surface 16a to have a step Δt2 therebetween. The valve plate 14 is arranged to be in parallel with the valve seat surface 16a in its closed position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hermetic rotary compressor applied to a refrigeration cycle device such as a refrigerator and an air conditioner, and more particularly to an improvement in a discharge valve structure.

[0002]

2. Description of the Related Art A rotary compressor generally has a structure in which an electric element and a compression element are housed in a closed casing, and both elements are connected by a shaft. The compression element is composed of a roller piston provided on a shaft and a compression chamber for accommodating the roller piston. The compression chamber is a thick plate-shaped cylinder having a circular hole, and a cylinder arranged so as to close the circular hole of the cylinder. And a pair of bearings for supporting the shaft joined to both surfaces in the thickness direction.

[0003] In most conventional rotary compressors, a discharge port for discharging the compressed refrigerant from the compression chamber into the closed casing is provided at the bearing, and the compressed refrigerant is supplied to the shaft through the discharge port. Are ejected along the axial direction of. A discharge valve provided at the discharge port has a valve plate for opening and closing the discharge port,
The valve plate is constituted by a valve mounting portion for supporting one end of the valve plate and a valve seat for receiving the other end of the valve plate when the valve is closed. The valve seat may be formed inside the bearing by cutting or the like. Many. In most cases, the surface of the valve seat and the surface of the valve mounting portion, that is, the valve mounting surface, are arranged on the same plane in the same direction, and the valve plate is formed in a flat plate shape.

[0004]

The operation of the discharge valve, in particular, the closing operation speed of the valve plate and the state of contact with the valve seat surface, etc.
It greatly affects the compression efficiency of the rotary compressor. For this reason, in the inventors, the valve plate of the discharge valve, the valve mounting surface,
Although research has been conducted to improve the closing operation speed by improving the shape or arrangement of the valve seat surface, etc., in the above-described conventional discharge valve structure, the valve seat surface and the valve mounting surface are arranged in a flat portion very close to the cylinder. Because the axial dimension of the bearing in the cylinder and the valve mounting part is relatively small, the thickness of the bearing in the valve mounting part must be smaller than the thickness of the valve seat part because it is necessary to maintain the valve mounting strength. However, effective improvement of the shape and arrangement of the valve plate, the valve mounting surface, the valve seat surface, and the like cannot always be achieved.

On the other hand, the inventors have developed a rotary compressor having a discharge port on the inner peripheral surface of a cylinder parallel to a shaft, and discharging refrigerant in a direction (radial direction) orthogonal to the shaft through the discharge port. We are promoting. In the case of a discharge valve provided in such a rotary compressor, a sufficient thickness dimension is secured along the radial direction of the cylinder, so that a valve plate attached to the discharge port, a valve mounting surface, a valve seat surface, etc. There is a wide range of choices regarding shapes and arrangements. For example,
It is relatively easy to form a step on the valve seat surface or valve mounting surface, or to arrange both surfaces to intersect at a fixed angle, and it is possible to set the shape and arrangement to increase the closing operation speed of the discharge valve. It becomes.

The present invention has been made in view of the above circumstances, and uses a hermetic rotary compressor that discharges refrigerant in a direction orthogonal to a shaft, and sets a step or an angle in a valve seat portion and a valve mounting portion. Then, by combining this with a curved discharge valve, the speed at the time of closing the valve is improved,
It is another object of the present invention to provide a rotary compressor discharge valve structure that can increase the compression efficiency.

[0007]

According to a first aspect of the present invention, there is provided a rotary compressor discharge valve structure having a discharge port on an inner peripheral surface of a cylinder parallel to a shaft. In a rotary compressor that discharges refrigerant in a direction orthogonal to the shaft through an outlet, a valve plate that opens and closes the discharge port has a curved shape, and a valve mounting surface on which the valve plate is mounted is located in the cylinder more than a valve seat surface. It is characterized in that it is arranged on the circumferential side to form a step between both surfaces, and that the valve plate is combined so as to be substantially parallel to the valve seat surface at the valve closing position.

[0008] A discharge valve structure for a rotary compressor according to a second aspect of the present invention has a discharge port on an inner peripheral surface of a cylinder parallel to a shaft, and discharges refrigerant in a direction orthogonal to the shaft via the discharge port. In a rotary compressor, a valve plate that opens and closes the discharge port has a curved shape,
The valve mounting surface for mounting the valve plate and the valve seat surface are arranged at a certain angle so as to intersect with each other, and the valve plate is combined so as to be substantially parallel to the valve seat surface in the valve closed position. And

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a discharge valve structure for a rotary compressor according to the present invention will be described below with reference to the drawings.

[First Embodiment] (FIGS. 1 to 4) FIG. 4 is a view showing the overall configuration of a hermetic rotary compressor. This rotary compressor is of a vertical type, and is configured such that an electric element 2 is housed in an upper part in a closed casing 1 and a compression element 3 is housed in a lower part.
The electric element 2 has a rotor 4 and a stator 5, and a shaft 6 is provided integrally with the rotor 4. Compression element 3
Is a roller piston 7 connected to the shaft 6 and rotating.
And a compression chamber 8 for accommodating the roller piston 7. The compression chamber 8 has a thick plate-shaped cylinder 10 having a circular hole 9 formed therein, and a thickness of the cylinder 10 which is arranged so as to close the circular hole 9 of the cylinder 10. And a pair of bearings 11a and 11b for supporting the shaft joined to both sides (upper and lower surfaces) in the vertical direction.

In such a configuration, in the discharge valve structure for a rotary compressor according to the present embodiment, a discharge port 12 is provided on an inner peripheral surface 10 a of the cylinder parallel to the shaft 6, and the refrigerant flows through the shaft 6 through the discharge port 12. Is discharged in a direction (cylinder radial direction) orthogonal to the above, and a discharge valve 13 is provided at the discharge port 12.

FIG. 1 is an enlarged plan view partially showing the structure of the discharge valve 13 described above, FIG. 2 is an exploded view showing the enlarged view of FIG. 1, and FIG. 3 is an explanatory view showing the operation. is there.

As shown in these figures, the discharge valve 13 includes a valve plate 14 for opening and closing the discharge port 12, a valve mounting portion 15 for supporting one end side (right end side in the figure) of the valve plate 14, and The valve seat 16 is configured to receive the other end (the left end in the figure) of the valve plate 14 when the valve is closed, and to have a valve presser 17 that presses the valve plate 14 at a predetermined opening position (the upper side in the figure) when the valve is opened. I have. In this embodiment, the valve mounting portion 15 and the valve seat portion 16
Are formed on one bent plate-shaped member 18, and this plate-shaped member 18 is integrated with the discharge port 12 by an insert when the cylinder 10 is formed by casting. The valve presser 17 is fixed to the valve mounting portion 15 of the plate-like member 18 together with the valve plate 14 by a fixture 19 such as a bolt.

In the present embodiment, the valve plate 14 basically has an arcuate shape under the above configuration. That is, as shown in FIGS. 2 and 3, the valve plate 14 is curved at a substantially middle portion so as to be concave toward the inner surface of the cylinder with a constant radius R1 larger than the radius R of the cylinder 10. Thus, the other end (left end) has a shape having a constant displacement Δt1 with respect to the surface on one end (right end).

On the other hand, a valve mounting portion 15 for mounting the valve plate 14
, The valve mounting surface 15a is disposed closer to the inner circumferential side (center side) of the cylinder than the surface of the valve seat portion 16, that is, the valve seat surface 16a.
Are parallel, but a step Δt2 is formed therebetween.
Low mounting valve mounting surface 1 having such a step Δt2
5a, one end of the valve plate 14 is placed on the valve plate 1.
The other end of the valve member 4 is brought into contact with the valve seat surface 16a in a high position at a valve closed position so as to be substantially parallel to the valve seat surface 16a.

That is, as shown in FIG. 3, one end of the valve plate 14 has a valve mounting surface 1 which is lower than the valve seat surface 16a by a step Δt2.
5a, and the other end of the valve plate 14 is basically Δt1 due to the bending radius R1 as shown by the broken line in FIG.
Only in the state of being displaced downward. By adopting a mounting structure in which the other end of the valve plate 14 is brought into contact with the valve seat surface 16a in a state where the valve plate 14 is lifted, the valve plate 14 has a
The intermediate portion elastically abuts on the valve seat surface 16a having a high position while maintaining the state in which the intermediate portion is bent upward, and the abutting surfaces are combined in a state of being parallel so that the valve is closed.

According to the discharge valve structure having such a structure, when the pressure of the refrigerant acts upward from the discharge port 12 with respect to the closed valve plate 14 shown by the solid line in FIG. When the pressure in the pressure chamber 8 becomes low due to refrigerant discharge, the valve returns to the closed state shown by the solid line in FIG. 3 again. In this case, if the valve plate 14 is basically in a flat state, the entire range of movement from the open state to the closed state is large because the valve plate 14 is flexed as a whole from the mounting portion side, and the moving time is required accordingly. In this case, the valve plate 14 is basically curved at the intermediate portion, and only the other end side is bent from the intermediate portion, so that the valve plate 14 is closed. Therefore, the opening and closing movement range is set to be small. The time required for operation is reduced.

[0018] Therefore, since the time for returning to the valve closed state is shortened, the valve is surely closed when the process proceeds to the next compression step, and the compression efficiency is increased as compared with the conventional one. Become. Therefore, according to the present embodiment, a hermetic rotary compressor that discharges refrigerant in a direction perpendicular to the shaft 6 is applied to set a step in the valve seat portion 16 and the valve mounting portion 15 and to adjust a curved valve to this. By combining the plates 14, the speed at the time of the closing operation of the discharge valve 13 can be improved, and the compression efficiency can be increased, and the efficiency of the rotary compressor can be improved.

[Second Embodiment] (FIGS. 5 and 6) FIG. 5 is an exploded view showing a second embodiment of the present invention, and FIG. 3 is an explanatory view showing an operation. The discharge valve structure for a rotary compressor of the present embodiment also has a discharge port 1 on the inner peripheral surface of a cylinder 10 parallel to the shaft 6, as in the first embodiment.
2 and is applied to a rotary compressor that discharges refrigerant in a direction orthogonal to the shaft 6 through the discharge port 12, and the overall configuration is substantially the same as that shown in FIGS. 4 and 1. Therefore, the description is omitted.

This embodiment is the same as the first embodiment in that the valve plate 14 for opening and closing the discharge port 12 has a curved shape. However, unlike the first embodiment, the valve for mounting the valve plate 14 is different from the first embodiment. A fixed angle θ1 between the mounting surface 15a and the valve seat surface 16a
This is different in that the valve plates 14 are combined in such a manner as to be substantially parallel to the valve seat surface 16a at the valve closed position under this configuration.

That is, in the present embodiment, the valve plate 1
4 is a constant radius R1 larger than the radius R of the cylinder 10 substantially at the middle portion as shown in FIGS.
, And is curved so as to be depressed toward the cylinder inner surface side, so that the other end side (left end side) has a constant displacement Δt1 with respect to the surface on one end side (right end side).

On the other hand, a valve mounting portion 15 for mounting the valve plate 14
, The valve mounting surface 15a is arranged so as to be inclined toward the inner circumferential side (center side) of the cylinder with respect to the surface of the valve seat portion 16, that is, the valve seat surface 16a. It is in a state of intersecting by the inclination angle θ1. In a state where one end of the valve plate 14 is placed on the valve mounting surface 15a having such an intersection angle θ1, the other end of the valve plate 14 is closed at a valve closing position with respect to the valve seat surface 16a which intersects at a high position. , So as to be in contact with the valve seat surface 16a in a substantially parallel state.

That is, as shown in FIG. 6, one end of the valve plate 14 is supported by a valve mounting surface 15a which intersects the valve seat surface 16a at an angle θ1. , The other end is displaced downward by the bending radius R1. With the mounting structure in which the other end of the valve plate 14 is brought into contact with the valve seat surface 16a with the other end raised, the valve plate 14 is in a state in which the intermediate portion is bent upward as shown by a solid line in FIG. The valve seat surface 1 of the cross arrangement while maintaining the
6a are resiliently abutted, and the abutting surfaces are combined in a parallel state so that the valve is closed. The angle at the valve closing position matches the intersection angle θ1 between the valve seat surface 16a and the valve mounting surface 15a.

According to the discharge valve structure having such a structure, when the pressure of the refrigerant acts on the valve plate 14 in the closed state shown by a solid line in FIG. When the pressure inside the pressure chamber becomes low due to the discharge of the refrigerant, the valve returns to the closed state shown by the solid line in FIG. In this case, in this embodiment, the valve plate 14
Is basically bent at the middle portion, and only the other end side is bent from the middle portion to be in the closed state. Therefore, the opening and closing movement range is set to be small, and the time required for the closing operation is correspondingly reduced. Has been shortened.

Therefore, also in this embodiment, the return time to the valve-closed state is shortened, so that the valve is reliably closed when the process proceeds to the next compression step, as in the first embodiment. As a result, the compression efficiency is higher than before. Therefore, also in the present embodiment, the crossing angle θ1 between the valve seat portion 13 and the valve mounting portion 15 is set by applying a hermetic rotary compressor that discharges the refrigerant in a direction orthogonal to the shaft 6, and By combining the valve plate 14 with a curved shape, the speed at the time of the closing operation of the discharge valve can be improved, and thus the compression efficiency can be increased,
The efficiency of the rotary compressor can be improved.

[0026]

As described in detail above, according to the present invention, a hermetic rotary compressor that discharges refrigerant in a direction perpendicular to a shaft is applied, and a step or an angle is formed between a valve seat portion and a valve mounting portion. By setting and combining this with a curved discharge valve, there is an excellent effect that the speed at the time of closing the valve can be improved, and consequently the compression efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a first embodiment of a rotary compressor discharge valve structure according to the present invention.

FIG. 2 is an exploded view showing the discharge valve structure of the first embodiment in an enlarged manner.

FIG. 3 is an explanatory diagram showing the operation of the first embodiment.

FIG. 4 is an overall configuration diagram showing a rotary compressor to which the first embodiment is applied.

FIG. 5 is an exploded view showing a second embodiment of a rotary compressor discharge valve structure according to the present invention in an enlarged manner.

FIG. 6 is an explanatory view showing the operation of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed casing 2 Electric element 3 Compression element 4 Rotor 5 Stator 6 Shaft 7 Roller piston 8 Compression chamber 9 Circular hole 10 Cylinder 10a Cylinder inner peripheral surface 11a, 11b A pair of bearings 12 Discharge port 13 Discharge valve 14 Valve plate 15 Valve mounting part 15a Valve mounting surface 16 Valve seat 16a Valve seat 17 Valve retainer 18 Plate member 19 Fixture R Cylinder inner diameter R1 Bending radius of valve intake duct Δt1, Δt2 Step θ1 Crossing angle

Claims (2)

[Claims] 1. A rotary compressor having a discharge port on an inner peripheral surface of a cylinder parallel to a shaft and discharging refrigerant in a direction orthogonal to the shaft through the discharge port,
While the valve plate that opens and closes the discharge port has a curved shape, a valve mounting surface for mounting the valve plate is disposed closer to the inner circumferential side of the cylinder than the valve seat surface to form a step between both surfaces, and the valve plate is A discharge valve structure for a rotary compressor, wherein the discharge valve structure is combined so as to be substantially parallel to the valve seat surface at a valve closed position. 2. A rotary compressor having a discharge port on an inner peripheral surface of a cylinder parallel to a shaft, and discharging refrigerant in a direction orthogonal to the shaft through the discharge port.
The valve plate for opening and closing the discharge port has a curved shape, while a valve mounting surface for mounting the valve plate and a valve seat surface are arranged in a direction crossing each other at a certain angle, and the valve plate is closed at a valve closed position. A discharge valve structure for a rotary compressor, wherein the discharge valve structure is combined so as to be substantially parallel to a valve seat surface.