JPH0620166Y2 - Vacuum regulator - Google Patents

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to a vacuum regulator that adjusts vacuum pressure.

[Prior art]

Conventional vacuum regulators generally perform pressure control by external pilot pressure. For example, in Japanese Utility Model Laid-Open No. 55-155311, a poppet valve body that cooperates with its valve seat is mounted in a valve body having an inlet and an outlet, and a main diaphragm having a large pressure receiving area is provided. Two diaphragms, a pressure air diaphragm with a small pressure receiving area, are stretched, and the main diaphragm divides the negative pressure chamber and the atmosphere opening chamber into upper and lower sections, and the pressure air diaphragm separates the pressure chamber and the atmosphere opening chamber. It is divided into upper and lower parts, a short rod is interposed between the central parts of these diaphragms, and a rod whose upper end abuts on the central part of the main diaphragm is projected on the poppet valve body. By introducing air pressure and changing the air pressure, the vacuum pressure from the outlet can be adjusted.

[Problems to be solved by the device]

However, in such a structure, since pilot pressure (air pressure) must be supplied from the outside to perform vacuum pressure control, an air pressure supply source and piping therefor are required, which increases running costs and also causes a vacuum regulator. Since it itself has two diaphragms stretched, it has drawbacks such as a complicated structure and a large size. The present invention aims to provide a vacuum regulator that does not have such drawbacks.

[Means for Solving the Problems]

The structure of the vacuum regulator of the present invention is as follows. In the valve body 1 having the suction port 3 connected to the vacuum pump and the suction port 4 connected to the actuator,
A poppet valve body 10 that cooperates with a valve seat 6 provided between the suction port 3 and the suction port 4 is provided with a return spring.
At 12, the valve seat 6 is urged and installed. A diaphragm 13 having a communication hole 20 in the central portion is stretched between the valve body 10 and the bonnet 2 on the valve body 10 to form an internal pilot chamber 14 on the upper side thereof and an atmosphere open chamber on the lower side. 15 sections are formed. The stem 23 is vertically planted in the poppet valve body 10 and vertically slidably penetrates through a guide hole 24 provided in the center of the valve body 1, and the upper end is located in the atmosphere open chamber 15. When the upper end of the diaphragm 13 is brought into contact with the diaphragm 13, the space below the suction port 4 and the internal pilot chamber 14, the internal pilot chamber 14 and the poppet valve body 10 is continuous with the communication hole 20 of the diaphragm 13. A vertical hole capable of communicating with the suction port 4 and the atmosphere opening chamber 15 when the upper end is separated from the diaphragm 13.
A communication passage consisting of 25 and lateral holes 26 is provided. An adjusting body 32 is provided outside the bonnet 2 to act a pressure adjusting spring 28 on the diaphragm 13 from above in the internal pilot chamber 14 and to adjust the spring force of the pressure adjusting spring 28.

[Action]

This vacuum regulator is used by connecting the suction port to a vacuum pump and the suction port to an actuator (object to be controlled). When the pressure adjustment spring is compressed by operating the adjustment body on the outside of the bonnet, the poppet valve body is pushed down against the return spring via the diaphragm and stem, and is separated from the valve seat, opening the suction port and the suction port. Then, the pressure on the actuator side drops. This pressure is guided to the internal pilot chamber on the upper side of the diaphragm through the communication passage of the stem and the communication hole of the diaphragm, so that the diaphragm bends upward and the poppet valve body rises following this, so that the poppet valve body is adjusted. When it equilibrates with the pressure spring, it closes and the vacuum pressure adjustment ends. When the pressure on the actuator side drops too much, the stem separates from the diaphragm, so that the atmosphere is introduced from the atmosphere open chamber below the diaphragm via the communication path of the stem, and the set vacuum pressure is achieved.

【Example】

An embodiment of the present invention will be described below in detail with reference to the drawings. In the figure, this vacuum regulator has a bonnet 2 mounted on a valve body 1. The valve body 1 is provided with a suction port 3 connected to a vacuum pump and a suction port 4 connected to an actuator on both side surfaces, and has a valve port 5 for communicating the ports 3 and 4 therein. A seat 6 and a valve chamber 7 therebelow are provided, and a recess 8 is formed on the upper surface.
The valve chamber 7 is airtightly closed from below by the lid 9. A poppet valve body 10 is fitted in the valve chamber 7 so as to slide vertically along a cylindrical guide protrusion 9a of the lid 9, and a space 11 is formed between the poppet valve body 10 and the lid 9. To be done. The poppet valve body 10 is biased upward by a return spring 12 to close the valve opening 5. On the other hand, a diaphragm 13 is stretched between the valve body 1 and the bonnet 2 so as to sandwich the peripheral edge between them, and the diaphragm 13 has an internal pilot chamber 14 above the bonnet 2 and a recess 8 below. It is open to the atmosphere in room 15. Although the internal pilot chamber 14 is airtight, the atmosphere opening valve 15 is open to the atmosphere through an atmosphere opening hole 16 provided in the valve body 1. A receiving plate 17 is fixed to the center of the diaphragm 13. The receiving plate 17 has an annular projection 18 on the upper surface, a recess 19 on the lower surface, a communication hole 20 in the center, and a communication hole 21 in the recess 19.
The stem packing 22 having the above is fitted. In the poppet valve body 10, a stem 23 is provided so as to protrude upward by inserting a lower end portion thereof into a central hole of the poppet valve body 10. The stem 23 vertically and slidably penetrates through a guide hole 24 at the center of the upper side of the valve body 1, and its spherical upper end abuts the stem packing 22 from below. Stem 23
The vertical hole 25 penetrating the upper and lower ends along the axis thereof and the horizontal hole 26 traversing midway are provided in the vertical hole 25 and the vertical hole 25.
Means the suction port 4 and the internal pilot chamber 14 through the communication hole 2
A vertical passage is formed while forming a communication passage that communicates via 1 and 20.
25 also communicates with the space 11 below and the internal pilot chamber 14 through the hole 27 of the poppet valve body 10. The diaphragm 13 is biased downward by a pressure adjusting spring 28 inside the internal pilot chamber 14. An adjusting screw 29 is rotatably attached to the upper portion of the bonnet 2, and the pressure adjusting spring 28 is fitted and fixed to the pressing plate 30 screwed to the adjusting screw 29 and the annular projection 18 of the receiving plate 17. It is arranged between the seat plate 31 and the seat plate 31. A cap-shaped adjusting body 32 that covers the bonnet 2 is attached to the outer end (upper end) of the adjusting screw 29, and the spring force of the adjusting pressure spring 28 is adjusted from the outside of the bonnet 2 by rotating the adjusting body 32. it can. Therefore, when the adjusting body 32 is rotated to lower the pressing plate 30 and the pressure adjusting spring 28 is compressed, the poppet valve body 10 is moved to the diaphragm.
It is pressed against the return spring 12 via the stem 13 and the stem 23 and separated from the valve seat 6, the valve port 5 opens and the suction port 3
And the suction port 4 are opened, and the pressure on the actuator side connected to the suction port 4 decreases. This pressure is guided to the internal pilot chamber 14 above the diaphragm 13 through the horizontal hole 26 and the vertical hole 25, which are the communication passages of the stem 23, and the communication holes 21 and 20 at the center of the diaphragm 13, so that the diaphragm 13 bends upward. Following this, the poppet valve body 10 rises. At this time, the lower side of the poppet valve body 10 also has an internal pilot chamber 14
Becomes the same pressure as. Therefore, the poppet valve body 10 closes the valve port 5 at the time when the poppet valve body 10 is in equilibrium with the pressure adjusting spring 28, and the adjustment of the vacuum pressure is completed. When the pressure on the actuator side is too low, the stem 23 separates from the stem packing 22 in the center of the diaphragm 13, so that the atmosphere is introduced from the atmosphere open chamber 15 below the diaphragm 13 via the communication path of the stem 23, It becomes the set vacuum pressure.

[Effect of device]

According to the present invention, a vertically slidable stem that connects the poppet valve body and the diaphragm is provided with a communication passage that connects the internal pilot chamber on the upper side of the diaphragm and the suction port, and a pressure regulating spring acts on the diaphragm. Then, since the vacuum pressure is adjusted by the spring force and the internal pilot pressure, the following effects are obtained. Piping for supplying the external pilot pressure as in the conventional case is not required. Since no external pilot pressure is required, running costs can be reduced. Since the vacuum pressure can be adjusted by the single diaphragm, the pressure adjusting spring that urges the diaphragm, and the adjusting body that adjusts the spring force, downsizing and cost reduction can be achieved.

[Brief description of drawings]

The drawings are cross-sectional views of one embodiment of the present invention. 1 ... Valve body, 2 ... bonnet, 3 ... suction port,
4 ... Suction port, 6 ... Valve seat, 10 ... Poppet valve body,
12 ... Return spring, 13 ... Diaphragm, 14 ...
… Internal pilot room, 15 …… Atmosphere opening room, 20,21 …… Communication hole, 23 …… Stem, 25,26 …… Vertical and lateral holes of stem, 28 …… Pressure adjusting spring, 32 …… Adjuster .

Claims (1)

[Scope of utility model registration request] 1. A poppet valve cooperating with a valve seat provided between a suction port and a suction port in a valve body having a suction port connected to a vacuum pump and a suction port connected to an actuator. The body should be biased to the valve seat side with a return spring and installed between the valve body and the bonnet above the diaphragm with a communication hole in the center. The pilot chamber has an open air chamber defined below.The stem is vertically installed in the poppet valve body and vertically slidably penetrates through the guide hole provided in the center of the valve body. The stem is located in the atmosphere open chamber, and when the upper end of the stem is brought into contact with the diaphragm, the intake port and the internal pilot chamber, the internal pilot chamber and the poppet valve body are continuously connected to the communication hole of the diaphragm. A communication passage including vertical holes, horizontal holes, etc., which can communicate with the lower space and can communicate with the suction port and the atmosphere opening chamber when the upper end is separated from the diaphragm is provided. A vacuum regulator characterized in that a pressure adjusting spring is applied to the diaphragm from above in the internal pilot chamber, and an adjusting body for adjusting the spring force of the pressure adjusting spring is provided outside the bonnet.