JPS647371Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a pressure reducing valve for pneumatic pressure, and more specifically, to a pressure reducing valve having a diaphragm having a structure in which a diaphragm membrane, a valve seat, a spring seat, etc. are integrally combined. .

BACKGROUND OF THE INVENTION Pressure reducing valves are used to provide constant pressure from a pneumatic source to a pneumatic circuit. First, a conventional example of this type of pressure reducing valve will be explained, and its problems will also be mentioned. FIG. 1 is a sectional view showing an example of a conventional pressure reducing valve. When the handle 10 is rotated and the adjustment screw 16 is advanced, the spring 14 is compressed and the valve pin 3 is pushed up via the spring seat 41, diaphragm membrane 40, valve seat 43, and packing 44, and the valve pin 3 is provided on the upper part of the valve pin 3. In order to open the valve 15, the inlet (primary side) 1
Air flowing in from a flows to the outlet (secondary side) 1b. The air pressure at this time is set by the amount of movement of the adjusting screw 16 in the axial direction. On the other hand, the outlet 1b
A part of the air flowing through the tube 9 flows into the diaphragm chamber 4b sealed by the diaphragm membrane 40, so that the pressure on the secondary side becomes equal to the pressure in the diaphragm chamber 4b. Diaphragm membrane 40
is a thin film made of soft synthetic rubber or the like. Now, if the pressure on the secondary side drops,
The pressure acting on the diaphragm membrane 40 also decreases, and the compressive force of the pressure regulating spring 14 becomes greater than the pressure acting on the diaphragm membrane 40 by the amount that the pressure on the secondary side decreases.
is further pushed up to widen the opening of the valve 15 to prevent a drop in pressure. Conversely, when the pressure on the secondary side increases, the pressure acting on the diaphragm membrane 40 increases and the compressive force of the spring 14 is reduced, so the valve pin 3 is pushed down by the spring 13, reducing the opening of the valve 15 and reducing the pressure. lower. If the pressure on the secondary side increases further,
The diaphragm membrane 40 is further lowered and the valve 15
When the pressure on the downstream side exceeds the set pressure, the valve pin 3 closes the valve seat 43.
The air in the diaphragm chamber 4b passes through the relief hole 4a and is released into the atmosphere.

The structure of the diaphragm used in conventional pressure reducing valves was such that the diaphragm membrane 40, the valve seat 43 having the relief hole 4a provided in the center of the diaphragm membrane 40, the packing 44, and the spring seat 41 for receiving the spring 14 were molded separately, and these were attached together by pressing with the spring 14.

Therefore, there were problems in that the number of parts increased, assembly took time, and cost increased. Furthermore, since the space between the main body and the diaphragm is large, the valve main body becomes large and the response becomes poor.

Furthermore, after setting the pressure, in the example shown in Fig. 1, the hexagonal nut 25 was tightened with a tool such as a spanner to prevent loosening due to vibration, but a tool such as a spanner must be prepared each time. Since the operation is troublesome, there was a demand for the development of a simple locking mechanism.

(Purpose of the invention) Therefore, the purpose of the invention is to provide a pressure reducing valve that is easy to assemble, compact, and has good response by integrating the structure of the diaphragm part.

(Structure and operation of the invention) In order to achieve the above object, the pressure reducing valve of the invention sets the compression force of the pressure regulating spring by moving the adjusting screw forward and backward by rotating the handle, and transmits this compression force through the spring seat. By transmitting the information to the diaphragm, the valve pin that contacts the valve seat provided at the center of the diaphragm is displaced, opening the valve provided on the valve pin, connecting the primary side air to the secondary side, and connecting the secondary air to the secondary side. A part of the air on the side is sent to a diaphragm chamber separated by the diaphragm, and when the air pressure on the secondary side becomes lower than the set pressure, the diaphragm is lifted by the compression force of the pressure regulating spring, displacing the valve pin and closing the valve. When the valve is moved in the opening direction and the air pressure on the secondary side becomes higher than the set pressure, the force through the diaphragm becomes greater than the compression force of the pressure regulating spring, so the diaphragm is pushed down and the valve pin is displaced. The valve is moved in the closing direction, and when the air pressure on the secondary side increases, the valve is closed and the valve pin moves away from the valve seat, thereby releasing air from the secondary side through the relief hole provided in the valve seat. In the pressure reducing valve that maintains a constant air pressure on the secondary side by discharging air into the atmosphere, the valve seat has a central part of the diaphragm membrane made harder than the diaphragm membrane, and the relief hole is provided in the center; The diaphragm and the spring seat are joined and integrally molded, and the center portion of the diaphragm forms the valve seat.

According to the above configuration, all the diaphragm parts are integrally molded, so assembly is easy, and
It is small in size and has good pressure responsiveness, so the purpose of the present invention can be completely achieved.

(Example) Hereinafter, the present invention will be explained in more detail with reference to the drawings and the like. FIG. 2 is a side sectional view showing the structure of the pressure reducing valve according to the present invention. Note that parts having the same functions as those of the conventional example shown in FIG. 1 are given the same reference numerals.

The main body 1 has an inlet 1a, an outlet 1b, and a valve seat 1c.
is provided. The valve pin 3 is airtightly inserted into the main body 1 via an O-ring 7, and a valve 15 is integrally provided on the upper part of the valve pin 3. The valve body 15a of the valve 15 is inserted into the valve seat 1 of the main body 1
c can be opened and closed. Main body 1 has plug 12
It is sealed with an O-ring 21 in between. A spring 13 is inserted between the plug 12 and the valve 15 to urge the valve 15 downward, and an O-ring 5 is inserted between the main body 1 and the plug 12 to maintain airtightness. The space 4b of the main body 1 is airtightly divided by a diaphragm 4.
is fixed to the main body 1 with a bonnet 2 via a slip washer 8. A relief hole 4a is provided in the center of the diaphragm 4, and is sealed by the head 3a of the valve pin 3. The outlet 1b of the main body 1 and the diaphragm chamber 4b are communicated through a passage 9a of the aspirator tube 9. An adjustment screw 16 is pivotally supported on the bonnet 2, and a spring seat 17 is screwed into the adjustment screw 16. A pressure regulating spring 14 is inserted between the spring seat 17 and the diaphragm 4, and a necessary compressive force is applied to the diaphragm 4 by rotating the regulating screw 16.
The interior space 2a of the bonnet 2 communicates with the atmosphere via a passage 2b. The adjustment screw 16 can rotate integrally with the handle 10 via the handle guide 11. Since the spring seat 17 is prevented from rotating on the inner surface of the bonnet 2,
By rotating the adjusting screw 16, the spring seat 17 moves back and forth, applying a necessary compression force to the pressure regulating spring 14, and setting the pressure to an arbitrary value. An E-ring 6 is provided at the tip of the adjustment screw 16 to prevent the spring seat 17 from coming off. 18 is a mounting ring for mounting a pressure reducing valve. FIG. 3 is a side sectional view showing an embodiment of a diaphragm used in a pressure reducing valve according to the present invention. The diaphragm 4 is composed of a membrane portion 40, a spring seat 41, a reinforcing cloth 42, and a relief sheet 43. The spring seat 41 is made by pressing a thin steel plate. The rubber joint surfaces of the spring seat 41 and the diaphragm 4 are molded by applying an adhesive during molding. A reinforcing cloth 42 is integrally formed on the membrane portion 40 of the diaphragm 4, and the center portion is punched out into a circle. The material, thread diameter, etc. of the reinforcing cloth 42 are appropriately selected according to the pressure used. A relief seat portion 43 is provided at the center of the diaphragm 4, with which the head portion 3a of the valve pin 3 comes into contact, and a relief hole 4a is bored in the center of the relief seat portion 43. The reason why the center of the cloth 42 is punched out is to prevent cloth lint from coming out when forming the surface 43a of the relief sheet portion 43 and the relief holes 4a. The relief sheet portion 43 has a higher hardness than the membrane portion 40. This is because in order to improve the responsiveness of the pressure reducing valve, it is necessary to reduce the thickness of the diaphragm membrane 40 of the diaphragm 4 to lower the rubber hardness. It is better to have a smaller pressure difference, but since the relief operating pressure changes depending on the tightening margin of the rubber, lowering the hardness of the rubber will increase the tightening margin and increase the relief operating pressure. In this embodiment, the membrane portion 40 of the diaphragm 4 has a semicircular waveform, but this is to reduce the change in the effective pressure-receiving area of the diaphragm 4 in response to a change in the position of the diaphragm 4. It has been confirmed that the flow characteristics are better than that of a flat diaphragm.

Next, the operation of the present invention will be explained. When setting the pressure, rotate the handle 10 and apply the necessary compression force to the pressure regulating spring 14, thereby pushing the spring seat 41 of the diaphragm 4. The valve 15 is opened via the valve pin 3, and the flow of water flows from the inlet port 1a. The air flows to the outlet 1b.
A portion of the air flowing to the outlet 1b flows into the diaphragm 4 via the passage 9a of the aspirator tube 9. Now, if the pressure on the secondary side decreases, the pressure acting on the diaphragm 4 will also decrease, and the compression force of the pressure regulating spring 14 will be reduced by the pressure acting on the diaphragm 4 by the amount that the pressure on the secondary side has decreased. Since the valve pin 3 has become larger, the valve pin 3 is further pushed up to widen the opening of the valve 15 to prevent a drop in pressure. Conversely, when the pressure on the secondary side increases, the pressure acting on the diaphragm 4 increases and the compressive force of the spring 14 is reduced, so the valve pin 3 is pushed down by the spring 13, reducing the opening of the valve 15 and reducing the pressure. . When the pressure on the secondary side rises further and exceeds the set pressure, the diaphragm 4 falls further, closing the valve 15 and the valve pin 3 no longer contacts the valve seat 43, causing the air in the diaphragm chamber 4b to flow through the relief hole 4a. released into the atmosphere.

4 to 6 are diagrams for explaining the lock mechanism used in the present invention.

After setting the pressure, by pushing the handle 10 in the direction of the main body 1, the protrusion 29 on the handle 10 is separated from the detent mechanism 32 using the action of the spring of the handle guide 11, and the internal gear 28 of the handle 10 and the bonnet are separated. It is locked when the two external gears 27 mesh with each other (Fig. 6). Handle guide 1
1 is a slope 30 on the handle 10 due to the action of a spring.
Since pressure is applied to the handle 10 after locking,
This prevents wobbling from occurring. The handle guide 11 has the shape of a circle with two sides cut off, and transmits the rotational torque of the handle 10 to the adjusting screw 16 through a shoulder portion 33 (FIG. 4). The handle 10 can be removed by pulling hard, if necessary. Further, in place of the attachment ring 18, a cover (not shown) covering the handle 10 can be used to prevent the setting value from being moved inadvertently.

(Effects of the invention) As explained in detail above, according to the invention, by molding the spring seat integrally with the diaphragm, the number of parts can be reduced, the time required for assembly can be shortened, and Since the volume of the air inflow chamber to the diaphragm is small and the mass of the diaphragm can be reduced, the responsiveness can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a conventional pressure reducing valve. FIG. 2 is a side sectional view showing the structure of the pressure reducing valve according to the present invention. FIG. 3 is a side sectional view showing an embodiment of a diaphragm used in a pressure reducing valve according to the present invention. 4 to 6 are diagrams for explaining the lock mechanism used in the present invention. 1... Body, 2... Bonnet, 3... Valve pin, 4... Diaphragm, 40... Diaphragm membrane, 41... Spring seat, 42... Reinforcement film, 43... Valve seat, 43a... Seat surface, 4a...Relief hole, 5...O ring, 6...
... E-ring, 7 ... O-ring, 8 ... slip washer, 9 ... aspirator tube, 10 ... handle, 11 ... handle guide, 12 ... plug,
13...Spring, 14...Spring, 15
... Valve, 16 ... Adjustment screw, 17 ... Spring seat, 18 ... Mounting ring, 21 ... O ring, 27 ... External gear, 28 ... Internal gear, 29 ...
... Convex portion, 30 ... Slope, 32 ... Detent mechanism,
33...Shoulder.

Claims (1)

[Scope of utility model registration request] The compression force of the pressure regulating spring is set by moving the adjustment screw forward and backward by turning the handle, and this compression force is transmitted to the diaphragm via the spring seat, thereby creating a valve pin that comes into contact with the valve seat provided in the center of the diaphragm. is displaced to open the valve provided on the valve pin, connecting the air on the primary side to the secondary side, and sending a part of the air on the secondary side to the diaphragm chamber separated by the diaphragm to connect the air on the secondary side. When the air pressure becomes lower than the set pressure, the diaphragm is lifted by the compression force of the pressure regulating spring, displacing the valve pin and moving it in the direction of opening the valve, and when the air pressure on the secondary side becomes higher than the set pressure, Since the force through the diaphragm becomes greater than the compressive force of the pressure regulating spring, the diaphragm is pushed down, displacing the valve pin and moving the valve in the direction of closing.Furthermore, when the air pressure on the secondary side increases, the valve is closed. In the pressure reducing valve, the air pressure on the secondary side is kept constant by closing the valve pin and releasing the air on the secondary side to the atmosphere through a relief hole provided in the valve seat when the valve pin separates from the valve seat. The valve seat is made by making the central part of the diaphragm membrane harder than the diaphragm membrane, providing the relief hole in the center, joining the diaphragm and the spring seat and molding them integrally, and making the central part of the diaphragm harder than the diaphragm membrane. A pressure reducing valve characterized by being configured to form a valve seat.