JPH05288183A - Manufacturing method of reed valve for compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to make it difficult to remove burrs generated during the processing of reed valves by a simple manufacturing method. Therefore, it is not necessary to remove burrs at the manufacturing stage. The number of processing steps can be reduced, the production efficiency can be improved, and the cost can be reduced. [Structure] A notch 18 that connects the opening 15 and the groove 16 is formed in the valve plate 13 in which the opening 15 and the groove 16 are formed. When forming the notch 18, a punch capable of allowing the burr to escape is pressed against the peripheral edge of the opening 15 to plastically deform a part of the peripheral edge of the opening 15. Therefore, the protruding burr 17a has a strong waist,
It does not fall off easily, eliminating the need to remove it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a reed valve for a compressor, which projects a fluid compressed by a compressor section into a closed container.

[0002]

2. Description of the Related Art A general compressor in which a reed valve, which is the premise of the present invention, is used will be described with reference to the drawings used for explaining an embodiment of the present invention. FIG. 1 is a sectional view showing a schematic configuration of a compressor. An electric motor element 4 including a rotor 2 and a stator 3 is provided in an upper portion of the closed container 1, and a compressor element driven by the electric motor element 4 via a crankshaft 5 is provided in a lower portion of the electric motor element 4. 6 are provided respectively. The compressor element 6 includes a roller 7 integrated with the crankshaft 5 and a cylindrical cylinder 8 accommodating the roller 7.
And an upper bearing end plate 9 and a lower bearing end plate 10 that close the upper and lower openings of the cylinder 8. The upper and lower bearing end plates 9 and 10 form a pair, and also serve to support the crankshaft 5. Further, the upper bearing end plate 9 is provided with a discharge port 11 and a discharge device 12 provided above the discharge port 11.

In the above compressor, the crankshaft 5 rotates when the electric motor element 2 is operated, and the roller 7 eccentrically rotates as the crankshaft 5 rotates. Due to the eccentric rotation of the roller 7, a fluid that is a refrigerant is sucked into the cylinder 8 and is further compressed by the eccentric rotation of the roller 7.
The compressed fluid is discharged from the discharge device 12 through the discharge port 11 when the pressure in the cylinder 8 rises above the pressure in the closed container 1. In such a compressor,
A so-called reed valve is used for the discharge device 12.
The reed valve includes a valve seat that opens and closes to prevent backflow of the discharged fluid, and a valve plate that seats the valve seat.

Conventionally, a reed valve including a valve seat and a valve plate as described above has been disclosed in, for example, Japanese Patent Laid-Open No. 57-57.
As disclosed in Japanese Patent Publication No. 195975, there is a valve plate formed of a sintered alloy. Further, as disclosed in Japanese Patent Publication No. 26713/1990, in a reed valve manufactured by processing a metal plate, in order to prevent delay of opening of the valve, a discharge valve seat which is a valve plate, There is one in which a groove extending substantially radially is provided for the discharge port.

[0005]

However, in manufacturing the reed valve as described above, the one using a sintered alloy requires high temperature and high pressure, so that the number of processing steps increases and the production efficiency lowers. There is a problem that the cost becomes high. Further, in the case where a reed valve is obtained by processing a metal plate, burrs are generated when the groove is formed in the discharge valve seat as described above. The burr has a shape with a weak waist and is easily dropped off because the punch for groove processing does not take into consideration the escape of the burr. Therefore, if the burr drops off due to the impact due to the opening / closing operation of the valve and mixes in the compressor, it hinders the operation of the compressor. Therefore, it is necessary to remove the burr at the manufacturing stage, but the number of processing steps increases accordingly.

The present invention solves the above-mentioned problems, and makes it possible to prevent burr generated during processing of a reed valve from coming off easily by a simple manufacturing method. Therefore, it is an object of the present invention to provide a method of manufacturing a reed valve for a compressor, which can reduce the number of processing steps, improve the production efficiency, and further reduce the cost.

[0007]

To achieve the above object, the present invention relates to a method for manufacturing a reed valve for a compressor comprising a valve seat that opens and closes, and a valve plate on which the valve seat is seated. Forming an opening and a groove at the periphery of the opening, and pressing a punch against the periphery of the opening while allowing the inner peripheral side of the periphery of the opening to project by plastic deformation. This is a method in which a part of the peripheral edge is plastically deformed to form a notch in a direction in which the opening and the groove are communicated with each other.

[0008]

According to the above manufacturing method, after the opening and the groove around the opening are formed in the metal plate to be the valve plate, the opening rim is allowed in the inward direction of the opening while the protrusion of the burr is allowed. Since the punch is pressed against and the notch is formed by plastically deforming a part of the peripheral edge of the opening, the generated burr is strong and hard to fall off, and it is not necessary to remove the burr.

[0009]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration of a compressor using a reed valve obtained by the manufacturing method of the present invention. In this compressor, an electric motor element 4 including a rotor 2 and a stator 3 is provided in an upper part of a closed container 1, and a lower part of the electric motor element 4 is driven by an electric motor element 4 via a crankshaft 5. A compressor element 6 is provided. The compressor element 6 includes a roller 7 integrated with the crankshaft 5, a cylindrical cylinder 8 accommodating the roller 7, an upper bearing end plate 9 and a lower bearing for closing upper and lower end openings of the cylinder 8. It is constituted by the end plate 10. The upper and lower bearing end plates 9 and 10 form a pair, and also serve to support the crankshaft 5. Further, the upper bearing end plate 9 is provided with a discharge port 11,
A discharge device 12 is arranged above the discharge port 11.

In the above compressor, the crankshaft 5 rotates when the electric motor element 2 is operated, and the rollers 7 rotate eccentrically as the crankshaft 5 rotates. Due to the eccentric rotation of the roller 7, a fluid that is a refrigerant is sucked into the cylinder 8 and is compressed by the eccentric rotation of the roller 7. When the pressure in the cylinder 8 rises above the pressure in the closed container 1, the compressed fluid is discharged from the discharge device 12 via the discharge port 11.
Is discharged more. In such a compressor, a so-called reed valve is used as the discharge device 12. As shown in FIGS. 2 and 3, which will be described later, the reed valve includes a valve seat 14 that opens and closes to prevent backflow of discharged fluid, and a valve plate 13 that seats the valve seat.

The reed valve will be described with reference to the drawings.
FIG. 2 is a sectional view of the vicinity of the discharge device 12, FIG. 3A shows the valve seat 14, and FIG. 3B shows the valve plate 13. The valve plate 13 has an opening 15 communicating with the discharge port 11 provided in the upper bearing end plate 9. The valve seat 14 is attached to the upper surface of the valve plate 13,
It is an elastic leaf spring member that opens and closes the opening 15.

The opening 1 of the valve plate 13
An annular groove 16 is formed on the periphery of the groove 5, and a ring-shaped portion 17 is formed between the opening 15 and the groove 16.
A notch 18 having a V-shaped cross section is formed in a part of the ring-shaped portion 17 so that the opening 15 and the groove 16 are communicated with each other. When processing and forming this notch 18,
A burr 17a is formed so as to project toward the inside of the opening 15. In addition to the opening 15, the valve plate 13 is provided with a pilot hole 20 which is provided auxiliary for pressure operation. On the other hand, the valve seat 14 is a metal plate having substantially the same size as the valve plate 13, and the outer peripheral region of the portion facing the opening 15 is cut out, leaving the portion serving as the fulcrum of the opening / closing operation. The valve plate 13 and the valve seat 14 are fixed to the upper bearing end plate 9 with screws through the fixing holes 19.

The valve seat 14 is opened by the pressure of the compressed fluid, the compressed fluid is discharged, and when the pressure in the cylinder 8 is reduced, the valve seat 14 is closed by the spring elasticity. In the above opening / closing operation, the fluid discharged from the discharge port 11 leaks from the notch 18 to the groove 16 through the opening 15.
The leaked fluid is transmitted to the groove portion 16 and is transmitted to the valve seat 14
Apply even pressure to the periphery of the. When this pressure increases, the valve seat 14 opens the opening 15 of the valve plate 13.

In this way, the valve plate 1 of the reed valve
By providing the notch 18 in FIG. 3, the opening of the valve seat 14 is not hindered by the surface tension of the lubricating oil (not shown) applied to the reed valve. Also, the groove 16
As a result, pressure is evenly applied to the contact portion between the valve seat 14 and the ring-shaped portion 17, so that a partial opening delay of the valve seat 14 can be prevented. Therefore, the responsiveness of the valve opening / closing operation is improved, and the valve opening / closing operation can be reliably performed.

Next, a method of manufacturing the valve plate 13 of this embodiment will be described with reference to the drawings. 4 (a)-
(D) is a figure which shows the process of processing the valve plate 13. In FIG. 4A, the opening 15, the fixing hole 19, and the pilot hole 2 are formed in the metal plate that becomes the valve plate 13.
0 is punched out by press punching. This press punching is a fine blanking press, and since this press punching is a precision punching with very few burrs, it does not require a step for removing burrs and only one step is required. In FIG. 4B, the groove 16 on the peripheral edge of the opening 15 and the groove of the pilot hole 20 on the opposite surface are plastically worked.
In FIG. 4C, the notch 18 is plastically worked by the punch 21 shown in FIG. 5 described later. Here, the burr 17a is generated on the inner peripheral side of the opening 15. In FIG. 4D, a metal plate is punched to the outer shape of the valve plate 13 by the fine blanking press.

The punch used in the above manufacturing method will be described with reference to the drawings. FIG. 5 is a view showing a punch used for forming the notch of this embodiment,
(A) is a perspective view, (b) is an upside down perspective view.
FIG. 6 is a perspective view showing a punch used for forming a conventional notch. In FIGS. 5A and 5B, the punch 21 has a tapered end portion 22 formed on a cylindrical end surface. A protrusion 23 is formed on the outer periphery of the punch 21. A substantially V-shaped pressing portion 24 is formed at the same height as the taper portion 22 of the protrusion 23.
Further, an escape portion 25 is formed between the pressing portion 24 and the slope of the taper portion 22.

When the notch 18 is formed by the punch 21, the taper portion 22 is positioned for insertion into the opening 15. Further, the punch 21 has the opening 1
5, the ring-shaped portion 17 is pressed by the pressing portion 24.
Is partially plastically deformed to form the notch 18 having a V-shaped cross section. Burrs generated during this plastic deformation are released to the escape portion 25 and protrude inside the opening 15 to form a burr portion 17a.

The punch 31 will be described in comparison with the conventionally used punch 31 shown in FIG. The punch 31 has a cylindrical end surface on which a taper portion 32 is formed. A protrusion 33 is formed on the outer circumference of the punch 31. At a predetermined height of the protruding portion 33, a substantially V-shaped pressing portion 34 is provided.
Are formed. The burr that occurs when the notch 18 is formed by the punch 31 does not have the relief portion 25, and thus has a shape with a weak waist.

On the other hand, the burrs 17a generated when the punch 21 of the present embodiment is used are protruded inwardly of the opening 15 by the relief portion 25 and have a stiff shape. Comparing these two, the burr generated by using the conventional punch 31 has a weak waist, and is easily dropped from the inner peripheral side of the ring-shaped portion 17. On the other hand, since the burr 17a generated by using the punch 21 has a strong rigidity, the burr 17a is unlikely to fall off from the inner peripheral side of the ring-shaped part 17.

As described above, in the reed valve manufacturing method of the present invention, by using the punch 21 having the relief portion 25, when the notch 18 is plastically deformed in the valve plate 13, the inner periphery of the opening portion 15 is formed. A burr 17a is generated on the side, but since the burr 17a has a strong shape, it does not easily come off. Therefore, it is possible to reduce the manufacturing process such as removing burrs.

[0021]

As described above, according to the present invention, there is provided a method of manufacturing a reed valve for a compressor comprising a valve seat and a valve plate, wherein the valve plate is formed with an opening and a peripheral edge of the opening. A notch is formed in the direction in which the groove portion and the opening portion and the groove portion communicate with each other. The notch is plastically worked by pressing a punch against the peripheral edge of the opening. The burr generated in the inward direction of the opening due to the formation of the notch has a stiff shape, and is unlikely to fall off. Therefore, the step of removing burrs can be omitted, the production efficiency can be improved, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of a compressor in which a reed valve obtained by a manufacturing method of the present invention is used.

FIG. 2 is a cross-sectional view showing the vicinity of a discharge device.

FIG. 3 is a view showing a reed valve, (a) is a valve seat,
(B) is a perspective view showing a valve plate.

FIG. 4 is a diagram showing a process of processing a valve plate.

5A and 5B are views showing a punch used for manufacturing a reed valve, FIG. 5A is a perspective view, and FIG. 5B is a perspective view seen from the opposite side.

FIG. 6 is a perspective view showing a conventional punch used for manufacturing a reed valve.

[Explanation of symbols]

 13 Valve Plate 14 Valve Seat 15 Opening 16 Groove 17 Ring-shaped 17a Burr 18 Notch 21 Punch 23 Projection 24 Pressing part 25 Relief

Claims (1)

[Claims] 1. A method of manufacturing a reed valve for a compressor, comprising: a valve seat that opens and closes; and a valve plate on which the valve seat is seated.
An opening and a groove are formed at the periphery of the opening, and a punch is pressed against the periphery of the opening while allowing the inner peripheral side of the periphery of the opening to project by plastic deformation. A method for manufacturing a reed valve for a compressor, wherein a part is plastically deformed to form a notch in a direction in which the opening and the groove are communicated with each other.