JPH07217756A - Valve device for compressor and manufacture thereof - Google Patents

Abstract

PURPOSE:To ensure sealing by forming a valve on the outer surface of the front end part of a bulged part formed on and projected from the outer surface of a valve seat plate, so as to increase the close contact force pressure per area between the valve seat and a valve element. CONSTITUTION:A bulged part 8 is formed at a predetermined position on a valve seat plate 7, being projected upward from the outer surface thereof, and a discharge hole 9 as a communication port, is formed and opened therein so that the outer surface of the upper end part of the bulged part 8 is used as a discharge vale seat 10 surrounding the discharge hole 9. Further, a pedestal 11 is formed, being projected from the valve seat plate 7 at a position spaced from the discharge valve seat 10, and a discharge valve element 12 made of a flexible planar plate and having one end seated on the discharge valve seat 10, is secured at the other end thereof to the pedestal 11 by means of a bolt 13. With this arrangement, the contact area between the discharge valve element 12 and the discharge valve seat 10 is made to be small in comparison an intake valve seat 24, thereby it is possible to ensure satisfactory sealing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device for a compressor and a method for manufacturing the valve device.

[0002]

2. Description of the Related Art As a conventional compressor valve device, a plate-shaped valve seat plate is provided with a discharge hole and a suction hole, respectively, and a plate-shaped discharge valve having flexibility on the surface side of the valve seat plate. It is known that a body is provided with a flexible plate-shaped suction valve body on the back surface side. One end of the discharge valve body is fixed to the surface of the valve seat plate, and the other end of the discharge valve body can be brought into contact with and separated from the discharge valve seat formed around the discharge hole. It is fixed to the back surface of the seat plate, and the other end of the seat plate can be brought into and out of contact with a suction valve seat formed around the suction hole. In the intake cycle of the compressor, the discharge valve body is pressed against the discharge valve seat by the pressure in the air tank that stores compressed air to close the discharge hole,
External air is sucked into the cylinder by pushing the suction valve body open through the suction hole. On the other hand, in the discharge cycle of the compressor, the suction valve body comes into pressure contact with the suction valve seat by the pressure in the cylinder to close the suction hole, and when the pressure in the cylinder becomes larger than the pressure in the air tank, the compressed air is The discharge valve body is pushed open and discharged from the discharge hole into the air tank. Incidentally, in particular, the discharge valve body is required to have a function of preventing compressed air having a high pressure in the air tank from escaping to the cylinder side when the compressor is stopped. Therefore, conventionally, an annular groove is formed around the discharge hole, and the annular portion between the annular groove and the discharge hole is used as the discharge valve seat, so that the discharge is performed as compared with the case where the annular groove is not formed. The contact pressure per unit area of the valve body to the discharge valve seat is increased to ensure a reliable seal. Further, when the valve seat plate side surface of the plate-shaped discharge valve body is configured to contact the surface of the valve seat plate, the discharge valve body is seated on the discharge valve seat when dust or the like is caught between the two. Is incomplete. For this reason, a recess is formed in the valve seat plate by removing the portion between the discharge valve seat and the mounting portion of the discharge valve body to the valve seat plate, and the recess forms a space between the discharge valve body and the valve seat plate. It reduces the risk of dust getting caught.

[0003]

However, an annular groove is formed around the discharge hole, or a recess is formed by removing the gap between the discharge valve seat and the mounting portion of the discharge valve body to the valve seat plate. Is a complicated work, and productivity is poor, which has led to an increase in cost. In view of such circumstances, the present invention provides a compressor valve device having excellent productivity and a manufacturing method thereof.

[0004]

That is, in the valve device of the present invention, a part of a plate-shaped valve seat plate is press-molded from the rear surface side to the front surface side to form the surface on the front surface side of the valve seat plate. A bulging portion formed so as to project more than that of the bulging portion, a communication hole formed by opening the bulging portion, a valve seat formed by surrounding the communication hole on the tip surface of the bulging portion, and the valve. A pedestal provided on the surface side of the seat plate so as to project from the surface, and a flexible plate-like member having one end fixed to the pedestal and the other end brought into contact with and separated from the valve seat to open and close the communication hole. And a valve body of. Further, the manufacturing method of the present invention is such that a part of the plate-shaped valve seat plate is pressed from the back surface side toward the front surface side, and the bulging portion and the pedestal protruding toward the front surface side of the valve seat plate from the surface And a step of smoothing the surface of the bulging portion, a step of forming a communication hole in the bulging portion and forming a valve seat around the communicating hole, and flexibility. And a step of attaching the other end of the plate-shaped valve body to the pedestal so that one end of the plate-shaped valve body can come into contact with and separate from the valve seat. In the manufacturing method of the present invention, the bulging portion and the valve seat may be provided in different steps.

[0005]

According to the valve device having the above structure, since the valve seat is formed on the surface of the tip end of the bulging portion formed so as to project from the surface of the valve seat plate, the plate-shaped valve body is provided with the valve seat. The contact pressure per unit area between the valve seat and the valve body can be increased as compared with the case where the entire surface of the plate is in close contact, and thus reliable sealing can be achieved. Further, since the pedestal to which one end of the valve body is fixed and the bulging portion on which the other end of the valve body is seated are both formed so as to protrude from the surface of the valve seat plate, the pedestal is automatically formed between them. It is possible to secure a recessed portion in the inner wall of the valve body, and thus it is possible to reduce the possibility that dust or the like will be caught between the valve body and the valve seat plate. By the way, it is possible to weld a washer to the surface of the valve seat plate and use this as the above-mentioned bulging part, and to make the inside of the washer a communication hole, but in this case, between the valve seat plate and the washer. There is a risk of leaking airtight. Also, while forming a through hole in the valve seat plate,
The pipe may be welded to the through hole so that the end portion of the pipe projects from the valve seat plate, and the projecting portion serves as the bulging portion. In this case, from between the through hole and the pipe. There is a risk of leaks. However, in the valve device and the manufacturing method thereof of the present invention, since the bulging portion is formed by pressing a part of the plate-shaped valve seat plate from the back surface side to the front surface side, There is no room for such airtight leakage, and an annular groove is formed around the conventional discharge hole, or a recess is formed by removing the space between the discharge valve seat and the mounting part of the discharge valve body to the valve seat plate. The productivity can be improved in comparison with the above.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, a compressor comprises an air tank 1 for storing compressed air and a compression mechanism 2 for feeding compressed air to the air tank 1. Reference numeral 2 includes a cylinder 3 provided above the outside of the air tank 1 and a piston 4 in the cylinder 3. The piston 4 is interlocked with a motor 5 via a connecting rod and a crankshaft as is well known in the art. A plate-shaped valve seat plate 7 that constitutes the valve device 6 is attached to the upper portion of the cylinder 3, and a bulging portion 8 that projects above the surface is provided at a required position of the valve seat plate 7. . A discharge hole 9 serving as a communication hole is bored and opened in the bulging portion 8, and the upper end surface of the bulging portion 8 serves as a discharge valve seat 10 surrounding the discharge hole 9. Further, the valve seat plate 7 is provided with a pedestal 11 projecting from the surface at a position separated from the discharge valve seat 10, and one end of a discharge valve body 12 made of a flexible plate is connected to the discharge valve. The other end of the discharge valve body 12 is fixed to the pedestal 11 with a bolt 13 while being seated on the seat 10. A stopper 14 is provided on the discharge valve body 12 so as to overlap the discharge valve body 12. One end of the stopper 14 is fixed to the pedestal 11 by a bolt 13 that fixes one end of the discharge valve body 12, and the other end of the stopper 14 with respect to the upper surface of the valve seat plate 7 is located approximately at the center in the longitudinal direction of the stopper 14. Are separated upward by a predetermined angle. Therefore, the discharge valve body 12 constitutes a check valve which allows the compressed air in the cylinder 3 to flow upward through the discharge hole 9, and at this time, the discharge valve body 12 is largely expanded by the compressed air. When lifted up, the discharge valve body 12 comes into contact with the lower surface of the stopper 14 and stops at that position. Further, slits 12a and 14a are formed at the pedestal side end portions of the discharge valve body 12 and the stopper 14 respectively (FIG. 7a).
By engaging each of the slits 12a and 14a with the positioning pin 15 fixed to the pedestal 11, the discharge valve body 12 and the stopper 14 do not rotate together when the bolt 13 is tightened. Next, a suction hole 21 is formed in the valve seat plate 7 at a position different from the discharge hole 9, and a suction valve body 22 is attached to the lower surface of the valve seat plate 7. The suction valve body 22 is made of a flexible plate, and one end of the suction valve body 22 is attached to the lower surface of the valve seat plate 7 by a fixing pin 23 press-fitted and fixed in a bottomed hole formed in the valve seat plate 7. And the other end is the suction hole 21.
Is seated on a suction valve seat 24 around the. Further, a cylinder head 31 is placed on the upper surface of the valve seat plate 7, and the cylinder head 31 is fixed to the cylinder 3 together with the valve seat plate 7 by a bolt (not shown). The inside of the cylinder head 31 is divided into a discharge chamber 32 and a suction chamber 33 by a partition 31a having a predetermined shape. The discharge chamber 32 is connected to the discharge hole 9 and the suction chamber 33 is connected to the suction hole 21. Has become. The discharge chamber 32 communicates with the inside of the air tank 1 via a pipe 34,
The suction chamber 33 communicates with the atmosphere via an air filter 35. In FIG. 1, reference numeral 36 is a relief valve. In the above configuration, when the motor 5 is started and the piston 7 is lowered, air is sucked into the cylinder 3 via the air filter 35 and the suction valve body 22. At this time, the discharge valve body 12 is pressed against the discharge valve seat 7 by the pressure in the air tank 1 to prevent compressed air from flowing out of the air tank 1 to the cylinder 3. On the other hand, motor 5
When the piston 7 is lifted by this, the air in the cylinder 3 is compressed and pushes open the discharge valve body 12, and is discharged into the air tank 1 through the pipe 34 and is stored therein. At this time, the suction valve body 22 is pressed against the suction valve seat 7 by the pressure in the cylinder 3 to prevent compressed air from flowing out of the cylinder 3 to the outside. Further, according to the present embodiment, the surface of the upper end portion of the bulging portion 8 protruding above the surface of the valve seat plate 7 is used as the discharge valve seat 10.
The contact area between the discharge valve body 12 and the discharge valve seat 10 can be made relatively smaller than that of the suction valve seat 24, whereby good sealing performance can be secured. The pedestal 11 to which one end of the discharge valve body 12 is fixed and the bulging portion 8 on which the other end of the discharge valve body 12 is seated are both formed so as to protrude from the surface of the valve seat plate 7. Therefore, it is possible to automatically secure the concave portion between the both, and thus it is possible to reduce the possibility that dust or the like is caught between the discharge valve body 12 and the valve seat plate 7 by the concave portion. Next, a method for manufacturing the valve device 6 will be described. 2a, FIG.
In b, first, a substantially rectangular valve seat plate 7 is punched out from a plate-shaped material having a predetermined thickness by a press, and at the same time, holes 41 for attachment at four corners of the valve seat plate 7, a suction hole 21, and a cylinder head. The mounting holes 42 are also punched. Next, after both sides of the valve seat plate 7 have been ground and smoothed (FIGS. 3a and 3b), in the illustrated embodiment, four positions of the valve seat plate 7 are pressed from the rear surface side to the front surface side. Two bulged portions 8 and two pedestals 11 each of which is pressed by a machine and protrudes from the surface of the valve seat plate 7 are formed (FIG. 4a, FIG. 4a).
Figure 4b). Then, when the surfaces of the bulging portions 8 and the pedestal 11 are each ground smoothly (FIGS. 5a and 5b), the bulging portions 8 are provided with the discharge holes 9 as communication holes by punching. The surface of the bulging portion 8 that is opened and around each discharge hole 9 is formed as a discharge valve seat 10 (FIG. 6). Further, in each pedestal 11, a bolt hole 43 for screwing the bolt 13 and a bottomed pin hole 44 for press-fitting the positioning pin 15 are formed, and the valve seat plate 7 is also formed.
A bottomed pin hole 45 for press-fitting the fixing pin 23 is formed on the back surface side of the. Then, the mounting hole 42 and the bolt hole 43 are tapped and a female screw is screwed therein. Thereafter, with respect to the front surface side of the valve seat plate 7, the positioning pin 15 is inserted into the pin hole 44 of the pedestal 11.
Is press-fitted and fixed, and the slit 1 of the discharge valve body 12
2a and the slit 14a of the stopper 14 are engaged with the positioning pin 15 and the bolt 1 is inserted into the bolt hole 43.
3, the discharge valve body 12 and the stopper 14 are attached to the valve seat plate 7 (FIG. 7a). On the back surface side of the valve seat plate 7, the fixing pin 23 is press-fitted and fixed in the pin hole 45, and the suction valve body 12 is attached to the valve seat plate 7 (Fig. 7b). In this way, the bulging portion 8 and the pedestal 11 are formed by pressing a part of the plate-shaped valve seat plate 7 from the rear surface side to the front surface side, and the bulging portion 8 has a discharge hole 9 formed therein. Since the discharge valve seat 10 is formed around the discharge valve seat by piercing the hole, the discharge valve seat is cut off around the discharge valve seat as in the prior art, and the discharge valve seat and the mounting portion of the discharge valve body to the valve seat plate are formed. There is no need to cut the gap between the valve device 6
Productivity can be improved. Since the bulging portion 8 is integrated with the valve seat plate 7, when a washer is welded to the surface of the valve seat plate or a pipe is welded to a through hole formed in the valve seat plate to form the bulging portion. like,
There is no room for leaks. Although the discharge hole 9 is formed as a communication hole in the bulging portion 8 in the above embodiment, a suction hole may be formed as a communication hole. Further, although the pedestal 11 is formed at the same time as the bulging portion 8, both may be manufactured in separate steps, in which case either one may be manufactured first. Further, the pedestal 11 can be manufactured by a washer which is separate from the valve seat plate 7, for example.

[0007]

As described above, according to the present invention, it is possible to improve the productivity of the valve device while ensuring a good sealing property, thereby reducing the cost.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a cross section of a main part, showing an embodiment of the present invention.

FIG. 2a is a plan view showing the manufacturing process of the present invention.

2b is a side view of FIG. 2a.

FIG. 3a is a plan view showing another manufacturing process of the present invention.

3b is a side view of FIG. 3a.

FIG. 4a is a plan view showing still another manufacturing process of the present invention.

4b is a side view of FIG. 4a.

FIG. 5a is a plan view showing still another manufacturing process of the present invention.

5b is a side view of FIG. 5a.

FIG. 6 is a plan view showing still another manufacturing process of the present invention.

FIG. 7a is a plan view of the completed valve device.

7b is a rear view of FIG. 7a.

[Explanation of sign]

1 ... Air tank 2 ... Compression mechanism 6 ... Valve device
7 ... Valve seat plate 8 ... Swelling portion 9 ... Discharge hole (communication hole) 10 ... Discharge valve seat 11 ... Pedestal 12 ... Discharge valve body 21 ... Suction hole 22 ... Suction valve body 24 ... Suction valve seat

Claims (3)

[Claims] 1. A bulging portion formed by press-molding a part of a plate-shaped valve seat plate from the back surface side to the front surface side so as to project from the front surface side of the valve seat plate beyond the surface. A communication hole bored in the bulging portion, a valve seat formed by surrounding the communication hole on the tip end surface of the bulging portion, and a valve seat plate projecting from the surface toward the front surface side. And a flexible plate-shaped valve body having one end fixed to the pedestal and the other end contacting and separating from the valve seat to open and close the communication hole. Valve device. 2. A bulging portion and a pedestal projecting from the front surface side of the valve seat plate by pressing a part of the plate-shaped valve seat plate from the back surface side toward the front surface side, respectively. A step of forming, a step of smoothly grinding the surface of the bulged portion, a step of forming a communication hole in the bulged portion and forming a valve seat around the hole, and a flexible plate shape A step of attaching the other end of the valve body to the pedestal so that one end of the valve body can be brought into contact with and separated from the valve seat. 3. A step of pressing a part of the plate-shaped valve seat plate from the rear surface side to the front surface side to form a bulge portion protruding from the front surface side of the valve seat plate. A step of smoothly grinding the surface of the bulging portion, a step of forming a communication hole in the bulging portion and forming a valve seat around the communicating hole, and a step of forming a valve seat around the valve seat plate from the surface. And a step of mounting the pedestal by projecting the same, and a step of attaching the other end of the flexible plate-shaped valve body to the pedestal so that one end of the valve body can come into contact with and separate from the valve seat. A method of manufacturing a valve device for a compressor, comprising: