JP2533990B2 - Compressor discharge valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an air conditioner,
It is related to the discharge valve of the compressor, which changes the heat medium to a high-temperature and high-pressure gas state in a heating and air-conditioning machine or a freezer and a refrigerator, and sends it to the next stage. The present invention relates to a discharge valve having a shielded surface.

[0002]

2. Description of the Related Art A compressor serves to transform a heat medium into a high-temperature and high-pressure gas state heat medium during the four processes of compression, condensation, expansion and evaporation in an air conditioning cycle, and to send it to the next stage. Although such compressors come in various forms,
An example is a reciprocating compressor.

Such a reciprocating compressor is shown in FIGS.
As shown in FIG. 2, a piston 11 that is reciprocated by being connected to a device including a stator 11, a drive motor 10 formed of a rotor 12 having a crankshaft 12A, a crankshaft 12A, and a connecting load 22, is provided. Cylinder 2
1 is composed of a compression unit 20.

The compression section 20 is composed of a cylinder 21 and a piston 23 which is fitted and coupled so as to be freely movable in the cylinder 21, and is connected to the crankshaft 12A and the load 22. Valve plate 3 provided with a suction hole 31 and a discharge hole 32 in front of
0 and a cylinder head 40.

A suction valve portion 33 and a discharge valve portion 34 are installed inside and outside the valve plate 30, and the inside of the head 40 is a separation wall (not shown), and the discharge chamber 41 is separated from each other on the left and right sides. And a suction chamber (at this time, the suction chamber is installed on the opposite side of the discharge chamber 41 in FIG. 2, not shown), and the discharge hole 32 of the valve plate 30 is provided in the outer discharge chamber 41 and the suction chamber.
And the suction hole 31 are located respectively.

However, when such a reciprocating compressor is driven, a large amount of noise is generated. That is, after the suction operation of the compressor, contact noise of the discharge valve portion 34 is generated in the discharge process. There is. Furthermore, residual heat medium remains in the discharge holes 32, which reduces the efficiency of the compressor.

This will be described more specifically. As shown in FIG. 2 and the like, the piston 23 of the compression section 20 is
Is a suction operation, that is, when the vehicle moves backward, the discharge valve portion 34 comes to block the discharge hole 32 due to the instantaneous pressure difference in the cylinder 21 and the elastic restoring force, and the suction valve portion 33 opens the suction hole 31. However, when the piston 23 reaches the bottom dead center and the compression stroke starts after the heat medium is sucked into the cylinder, a relatively high pressure difference is generated, and the suction valve portion 33 closes the suction hole 31 by its elastic force. Then, the inhalation operation is stopped.

Further, the piston 23 is not closed immediately after the compression stroke is started beyond the bottom dead center, and then the pressure inside the cylinder is increased to assist the closing operation.
When a part of the compression stroke is completed and a certain pressure is reached at the end of the compression stroke, the discharge valve portion 34 that has blocked the discharge hole 32 is pushed out by a predetermined elastic pressure to discharge the heat medium in the cylinder 21. It is extruded into the discharge chamber 41 through 32.

At this time, while the discharge valve section 34 is being pushed out by the discharge pressure of the heat medium, the lead plate of the discharge valve section 34, which is composed of multiple ends, causes sliding friction to generate noise. In particular, as shown in FIG. 2, the discharge valve portion 34 is composed of elastic plate members, and has a pair of shield valve members 34A, 34A, which have elastic forces in opposite directions by bending both ends in opposite directions.
B and a parallel push support plate member 34 for pressing the shielding valve member
2 and a push support member 343, which are joined and fixed as a binding member 344 made of an elastic plate.

The shielding valve member, the pressing member, the binding member, and the like are fitted to a pair of bound 345A and 345B which are fitted and joined on both sides of the valve plate 30, and are stacked in parallel.

Therefore, when the piston 23 performs the suction operation, the shield valve member 341A of the pair of shield valve members 341A and 341B on the cylinder 21 side is in a horizontal state as shown in FIG. 2 due to a relatively low pressure difference between the cylinders. In, the middle portion of the shielding valve member 341A is sucked into the cylinder shaft and bends, and the suction operation is performed while the bent portion blocks the discharge hole 32.

At this time, the shielding valve member 341A cannot completely shield the discharge hole 32. More specifically, the shielding valve member 341A has a problem that the gas around the discharge hole 32 flows backward, and there is a defect that the inhalability is deteriorated. In addition, the shielding valve member 341A that has blocked the discharge hole 32 at the time of discharge vibrates due to the compressive force in the cylinder and returns to its original state while being separated from the discharge hole 32.
It hits the shielding valve member 341B at the rear side and emits contact noise.

Therefore, not only is there a problem that a large amount of operating noise is generated and the productability is deteriorated, but the discharge valve portion 34 is composed of a large number of members and the like, which makes the structure complicated. As a matter of course, there was a problem that the assemblability was poor, and further, in order to support the shielding valve member, the pressing support member, the binding member, etc., the binding pin 345A,
Leakage occurs at 345B, that is, the binding pins 345A and 345B are attached to the valve plate 30, and the cylinder 21 and the head 4 are connected.
The valve plate 30 in which the bundling pin is inserted is not precise at this time, so the airtightness of the valve plate 30 after use for a long time is poor and the compression performance is degraded. There was a problem that became.

Further, after the piston 23 performs the discharge operation, the suction operation is performed. At this time, the discharge valve portion 34 closes the discharge hole 32, and the compressed heat medium remaining in the discharge hole 32 enters the cylinder 21 through the suction hole 31, while remaining heat medium in the discharge hole 32. And the residual heat medium is expanded again. Therefore, there is a problem that the efficiency of the compressor is reduced due to the bulk of the residual heat medium.

Here, the noise reducing means is disclosed in US Pat.
537,566 (1985.8.27). The noise reduction means has a valve tube having a long gas passage and a portion placed on the gas passage so as to overlap the gas passage, and generates a moment in the valve member that selectively controls a gas flow passing through the gas passage. On the valve member, an elastic biasing means made of an operating spiral coil spring, the biasing means and the valve member are assembled in a valve tube, and an attaching means is extended from the valve tube.

At this time, the mounting means is inserted into a hole formed through the valve tube so as to support the valve tube. However, the noise reduction means has a remarkable noise reduction effect although the work efficiency is finely reduced.
Further, there is a problem that the above-mentioned structure also has an attachment means, that is, a binding pin, and the decrease in the increase in compression due to the airtightness described above cannot be excluded. Further, the feed-type valve member cannot reduce the amount of gas remaining in the gas passage in the valve pipe, resulting in a problem of reducing the efficiency of the compressor.

[0017]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a compressor in which a discharge valve is formed of a single plate material to prevent the noise of opening and closing the discharge hole. A discharge valve is provided.

Another object of the present invention is to provide a compressor discharge valve in which the discharge valve is easily fixed in the head and the airtightness is improved on the cylinder side to improve the compression performance. Another object of the present invention is to provide a compressor with a discharge valve that enters the inside of the cylinder and forms a shield to reduce the residual amount of the heat carrier gas in the cylinder, and to securely prevent the gas from flowing backward. To provide.

[0019]

In order to solve the above-mentioned problems, the discharge valve according to the present invention is formed by bending a plate material having a narrow band shape to form a closed loop into a polygonal shape. A connecting portion that is fixed to the inner wall surface of the head such that both ends of the plate material are overlapped with each other, and is located in parallel with the connecting portion;
The discharge port is contacted with the valve plate to seal the discharge hole.
A shielding surface that projects in a semi-circular shape toward the exit hole and the shielding surface.
Extends from the shielding surface to both sides and shields the periphery of the discharge hole
A contact surface, which extends from the contact surface and is connected to the buffer portion
The discharge hole is covered with
A shield part that double-shields by the action of the contact surface and the contact surface, and a support part that connects the both ends of the coupling part and the shield part substantially vertically to support the shield part so as to be sealed by the valve plate. , Located between the shielding portion and the coupling portion, extending from both ends of the shielding portion and bent into a semi-circular shape,
The gist of the present invention is to provide a buffer portion that imparts elasticity to the shielding portion.

In the discharge valve, the discharge pressure of the cylinder is
When the discharge pressure gradually increases, the shape of the buffer portion of the discharge valve contracts and deforms as the discharge pressure increases, and the shield portion having the shield surface is separated from the discharge hole of the valve plate, and the compressed heat medium is discharged to the discharge chamber. Send out. Further, after the discharging work is completed, the shape of the buffer portion is restored to its original state, and the shielding portion separated from the discharging hole contacts the discharging hole to shield the discharging hole, and the shielding surface remains in the discharging hole. Thus reducing the residual bulk of the compressed heat carrier and reducing the rate of re-expansion to new compressed heat carrier.

Due to this, it is possible to reduce the noise generated between the valves, prevent the leakage caused by the fastening means for the cylinder of the valve, reduce the residual amount of the compressed heat medium, and increase the compression efficiency. Can be done.

[0022]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 3 is an enlarged sectional view of an essential part showing a compression part, which is composed of a compression cylinder and a head part which are connected to the discharge valve of the present invention. As usual, the compression unit 20 is composed of a cylinder 21 and a head 40 that covers the valve plate 30 by blocking the tip of the cylinder 21 with the valve plate 30.

The head 40 has a partition wall inside, and is divided into a discharge chamber 41 and a suction chamber (not shown) separately on both sides. The valve plate 30 has a discharge chamber 4 of the head 40.
1 and a suction hole 31 located in each suction chamber, and a suction hole 31 is provided, and a suction valve portion 33 for opening and closing the suction hole 31 is provided between the valve plate 30 and the cylinder 21 and is a flat plate made of a material similar to a spring. It is generally constructed in the form of a lead using a spring.

The suction valve portion 33 has a relatively low pressure difference due to the suction force and the compression force in the cylinder 21, and the valve plate 3
Although the suction hole 31 of 0 is opened and closed, in one example,
When the piston in the cylinder performs the suction stroke, the suction hole is blocked at a relatively low pressure during the suction,
That is, it is in contact with the valve plate 30.

Due to the low pressure difference in the cylinder, the central portion 33A of the suction valve is separated from the valve plate 30 to open the suction hole 31 so that the heat medium can be sucked in.
Is reached to the bottom dead center and the compression stroke is started, the pressure increase inside the cylinder is sealed while assisting the closing action of the central portion 33A of the opened intake valve portion 33, and the intake hole 31 of the valve plate 30 is closed. It will be closed.

The purpose of doing so is to compress the heat medium sucked into the cylinder 21 and at the same time to forcibly push it out. The mechanism as illustrated in FIG. 3 is only one example of a compressor section of a compressor in which a discharge valve can be installed. The discharge valve unit 340 of the present invention is installed vertically on the inner surface of the head 40 and the outer side of the valve plate 30.

3, 4, and 5, the discharge valve portion 340 formed of a single elastic plate is shown in detail. Such a strip-shaped plate body is bent in a maximum of four steps to form an integral rectangular frame shape, and one side, that is, the overlapping portion 340G in which both ends of the plate body overlap each other,
Protrusion 4 integrally provided at the center of the inner wall surface of head 40
It is connected to OA by fitting.

More specifically, a fitting ball 340A is provided at the center of the overlapping portion 340G in which both ends of the plate are overlapped with each other, and the fitting ball 340A is fitted and coupled to the projection 40A provided on the inner wall of the head 40. The projection valve 340 is pressed and fixed to the inner wall surface of the head by forcibly pressing the end of the projection 40A. At this time, it is also possible to connect them by a screw tightening method such as a screw without using the compression method.

The discharge valve portion 340 is required to have a very small mass, a rigid flexible member and a relatively small moving range. On the other side of the discharge valve portion 340, that is, on the opposite side where the both ends overlap, the upper and lower corner portions are formed into a semi-circular shape along the upper and lower valves of the discharge valve portion 340, and are bent outward to contract. A buffer portion 340B that can be quickly expanded is provided, and a step-shaped shield portion 340E is integrally formed between the both buffer portions 340B at the outer end of the buffer portion in a direction perpendicular to the upper and lower surfaces of the discharge valve portion 340. It is set up in a row.

The shielding portion 340E is provided with a contact surface 340D having a shielding surface 340C with improved sealing of the discharge hole 32 provided in the center between extension portions thereof. At this time, the contact surface 340
It is preferable that D has a relatively small area, and the shield surface 340C is installed so as to project in a semi-circular shape so as to be inserted inside the discharge hole 32. At this time, the semi-circular surface is the same as the inner diameter of the head discharge hole 32 or has a relatively wider width. Furthermore, one side of the valve plate 30, that is,
On the outer side of the valve plate 30, a recessed portion 35 having a predetermined width is provided around the discharge hole 32.

The operation of the discharge valve portion 340 will be described in detail with reference to FIGS. 5 and 6. Discharge valve part 3
When the shielding surface 340C of the valve 40 is inserted into the discharge hole 32 of the valve plate 30 and is closed (FIG. 5), the cylinder 21 performs a suction process. At this time, the shielding surface 340C, which is a semi-circular spherical surface, causes the elastic force of itself and the cylinder 2
With the combined force of the relatively low pressure difference in 1, the line contact type is tightly brought into close contact with the periphery of the discharge hole 32 to give a complete sealing effect to the discharge hole 32, and at the same time, the recessed portion 35 around the discharge hole 32.
Is closely contacted with the contact surface 340D of the discharge valve portion 340, the shield is doubled, and the heat medium on the side of the discharge chamber 41 in the head during the suction process of the heat medium flows back into the cylinder 21 again. Will be prevented completely.

Further, in the state as described above, the cylinder 2
If the compression empty stroke begins to occur in 1 and the pressure rises above a predetermined pressure, due to the relatively high pressure difference, the shielding surface 3
40C is extruded in the discharge hole 32, and at the same time, the expulsion is made in the upper and lower buffer portions 340B of the discharge valve portion 340 without contact noise, that is, the shielding surface 34.
0C extruded through the connecting band 340F through the buffer 340.
When it is transmitted to B, the arc surface of the buffer portion 340B is shrunk, and the pushing force is naturally accommodated, and the discharge hole 3
If 2 is opened and the compressed high-temperature, high-pressure gaseous heat medium is discharged to the discharge chamber 41 side, and further, the compression stroke is completed, and at the same time the piston 23 starts the suction operation. The shield surface 340C that has been pushed out is the buffer portion 3
The discharge hole 32 is closed by the quick return operation of 40B.

Further, the shielding surface 340 of the discharge valve portion 340.
C is formed in the shape of a semi-circle and enters the discharge hole 32 of the protrusion 30 of the valve plate to form a shield so that the volume of the compressed heat medium remaining in the cylinder 21 during the expansion stroke immediately after the compression stroke is reduced. The height of the protrusion is reduced, and it is mixed with new heat medium sucked into the cylinder 21 through the suction hole 31 to improve the mixing ratio.

[0034]

As described above, the discharge valve formed according to the present invention allows the discharge hole of the valve plate to be opened and closed without noise due to contraction and extension of the cushioning portion. The opening / closing operation has the advantages that the backflow of the heat medium can be completely prevented during the suction and compression processes, the compression performance can be improved, and the productability can be enhanced.

Further, there is an advantage that the protruding shape of the shielding surface reduces the volume of the residual compression heat medium in the cylinder, increases the mixing ratio with the new suction heat medium, and improves the performance of the compressor. As a result, the structure of the discharge valve is simplified and there is an advantage that the assemblability and manufacturability can be improved. Although the embodiments of the present invention have been described so far, the present invention is not limited thereto, and it is considered that modifications can be made within the scope of the invention as described in the claims.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a general compressor.

FIG. 2 is a sectional view showing a conventional discharge valve.

FIG. 3 is a sectional view showing a discharge valve according to an embodiment of the present invention.

FIG. 4 is a perspective view of a discharge valve applied to an embodiment of the present invention.

FIG. 5 is an operation diagram of a discharge valve that is an embodiment of the present invention during a suction process of a compressor.

FIG. 6 is an operation diagram of a discharge valve according to an embodiment of the present invention during the expansion process of the compressor.

[Explanation of symbols]

 30 valve plate 32 discharge hole 340 discharge valve 340B buffer part 340C shielding surface 340D contact surface 340E shielding part 340F connected body

Claims (1)

(57) [Claims] 1. A discharge valve which opens and closes a discharge hole located in a space formed between a head of a compressor for sucking in and discharging a heat medium and a valve plate, and has a narrow band shape so as to form a closed loop. It is formed by bending a plate material constituting the polygon, and the coupling portion at both ends of the plate is fixed to an inner wall surface of the head overlap each other, positioned parallel to the coupling portion, in contact with the valve plate Before
A semi-circular shape toward the discharge hole to seal the discharge hole.
Shielding surface to be projected and extending from the shielding surface to both sides
From the contact surface that shields the periphery of the discharge hole and from the contact surface
Constituting with a connecting band that is extended and connected to the buffer section
The discharge hole by the action of the shielding surface and the contact surface.
And a shield for double shielding, a support for connecting both ends of the joint and the shield in a substantially vertical manner to support the shield to be sealed by the valve plate, and the shield and the joint. A discharge valve for a compressor, comprising: a buffer portion that is located between the shield portions and extends from both ends of the shield portion and is bent into a semi-circular shape to impart elasticity to the shield portion.