JPH0615185Y2 - Diaphragm type pressure control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a diaphragm type pressure control valve.

[Prior Art] In recent years, there is a great need for a small valve in order to reduce the installation space. Especially, when a plurality of valves are installed in series on a manifold base for centralized management, the length of the manifold base should be as small as possible. A small valve is required to be short.

However, in a known diaphragm-type pressure control valve having a circular pressure receiving surface, when the valve body is downsized due to the downsizing of the valve, the pressure receiving area of the diaphragm is significantly reduced and the driving force of the valve element is reduced. There is a problem that the accuracy of pressure control is reduced.

On the other hand, the valve body in which the ports are opened on the surfaces facing back has a substantially rectangular parallelepiped cross-sectional shape in which the length in the port opening direction is longer than the length in the direction orthogonal to the ports for opening the ports.

[Problems to be Solved by the Invention] The present invention focuses on the cross-sectional shape of the valve body. The problem to be solved by the invention is to provide a small-sized diaphragm pressure control valve with high pressure control accuracy. To do.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a first port and a third port opened on one surface facing the back, a second port opened on the other surface, and a first port. A valve body having a first valve seat in a flow passage that communicates the port and the second port, and having a substantially rectangular cross section in which the length in the opening direction of the port is longer than the length in the direction orthogonal to this; A cover that covers the valve body, a diaphragm whose peripheral edge is sandwiched between the valve body and the cover, and a first
A valve body that has a flow passage that connects the port and the third port, and a second valve seat that faces the diaphragm at the tip of the flow passage, and is movably inserted into the flow passage to open and close the first valve seat. And a diaphragm that moves the valve body by a diaphragm that is displaced depending on the magnitude of the fluid pressure and the working fluid pressure of the second port that is opposed to the diaphragm and that opens and closes the first valve seat and the second valve seat. In the pressure control valve, the pressure receiving portion of the diaphragm has a non-circular shape in which a port opening direction of the valve body is longer than a direction orthogonal to the port opening direction.

[Effects of Operation and Invention] By effectively utilizing that the length in the opening direction of the port in the valve body is longer than the length in the direction orthogonal thereto, the pressure receiving surface of the diaphragm is set to the opening direction of the port in the valve body. Since the non-circular shape that is longer than the direction orthogonal to the valve body does not reduce the pressure receiving area of the diaphragm, in other words, the driving force, even if the valve body becomes small, it is possible to prevent the decrease in pressure control accuracy due to the size reduction. be able to.

[Embodiment] FIGS. 1 and 2 show a first embodiment of the present invention. A valve body 51 of this diaphragm type pressure control valve 50 has a first port 53 formed on one surface facing the The third port 55, the second output port 54 opened on the other surface, and the supply valve seat 56 in the flow path that connects the ports 53 and 54 are provided, and the opening direction of the port (left-right direction in the figure) is orthogonal to this. Has a substantially rectangular cross section that is longer than the length in the direction (direction orthogonal to the drawing), and the peripheral edge of a diaphragm 11 described later is sandwiched between the valve body 51 and the cover 52.

The valve body 57 that opens and closes the first valve seat 56 includes a flow passage 57a that connects the second port 54 and the third port 55 to each other, and a second passage at the tip of the flow passage 57a.
The valve seat 58 is provided, and the second valve seat 58 is opened and closed by the displacement of the diaphragm. Further, a so-called one-touch fitting 54a (only one is shown) capable of locking a tube by insertion is attached to each of the ports 53, 54, 55, and a working air passage 52a is formed in the cover 52.

FIG. 3 and FIG. 4 show the first mode of the above-mentioned diaphragm. The outer shape of this diaphragm 11 is substantially similar to the cross section of the valve body 51 and is larger than the diameter of the fastening bolts described below at the two opposite corners. The pressure receiving surface 13 having the diameter holes 12 and 12 and the ribs 14 has a length in the opening direction (vertical direction in the figure) of the valve body 51 that is perpendicular to the direction (horizontal direction in the figure). Is formed in a pseudo-rectangular shape that is longer than the length of and the holes 12, 12 are inclined. Further, the shell 15 mounted on the pressure receiving surface 13 has a shape similar to that of the pressure receiving surface 13, and the periphery thereof is covered with a covering portion 16 extending from the rib 14 toward the center, and the covering portion 16 has a pseudo elliptical shape. The protrusion 16a is integrally formed.

However, the diaphragm 11 has ribs 14 and protrusions 16
Of course, a may be omitted, or the shell 15 may not be provided, and in this case, the covering portion 16 may be omitted.

This diaphragm 11 has a larger pressure receiving area than a known circular diaphragm having a short side of the rectangle as a diameter because the pressure receiving surface 13 is a pseudo rectangle, and therefore the width of the diaphragm 11 is small due to the miniaturization of the valve body. In this case, the pressure receiving area can be prevented from decreasing, and the performance such as sensitivity can be sufficiently satisfied like the diaphragm having the circular pressure receiving surface.

5 and 6 show a second aspect of the diaphragm,
This diaphragm 21 has an outer shape that is substantially similar to the cross section of the valve body 51, and has large-diameter holes 22 and 22 at two opposite corners.
However, holes 23, 23 having a smaller diameter than this are opened in the other two corners, and the pressure receiving surface 24 having the rib 25 is formed in an octagonal shape in which the portions of these holes are inclined to form the pressure receiving surface 24. Similar shells 26, 26 are mounted on both sides.

The action of the large-diameter holes provided in these diaphragms will be described later.

FIG. 7 shows a third aspect of the diaphragm. In this diaphragm 31, a pressure receiving surface 32 having a rib 33 is formed in a pseudo elliptical shape.

Since other configurations of the diaphragm 31 are the same as those of the diaphragm 21, the same reference numerals are given to the same portions in the drawings, and detailed description thereof will be omitted.

8 and 9 show a fourth aspect of the diaphragm,
The diaphragm 41 has an outer shape similar to the cross section of the valve body 51, has large-diameter holes 12 and 12 at two opposite corners, and the pressure-receiving surface 43 having a rib 44 is formed in a pseudo-elliptical shape. , A hole 45 is opened in the center.

In the first embodiment described above, in the state shown in the drawing in which the compressed air as the working fluid is not supplied to the flow path 52a, the valve body 57 closes the first valve seat 56 and the diaphragm 11 closes the second valve seat.
Separated from 58, the flow path 57a between the ports 54 and 55 communicates,
When compressed air is supplied from the flow path 52a, the diaphragm 11
Is displaced downward in the figure to press the valve body 57, so that the first valve seat 56 is opened and the second valve seat 58 is closed, and the flow paths between the ports 53 and 54 are in communication with each other.

Further, as shown in FIG. 2, a fluid passage 12a can be formed between the bolt 59 for fastening the valve body 51 and the cover 52 and the large-diameter hole 12 formed in the diaphragm 11. it can.

The first embodiment utilizes the fact that the length of the valve body 51 in the port opening direction is larger than the length in the direction orthogonal thereto, so that the diaphragm 11 is moved laterally (left and right in the drawing).
Even if the width of the valve body 51 in the horizontal direction (consecutive direction) becomes smaller due to the miniaturization of the valve body 51, its pressure receiving area is larger than the length in the vertical direction (vertical direction in the figure). Can be prevented, and since the driving force is not reduced by this, the precision of pressure control can be prevented from being lowered.

Fig. 10 shows the electric fluid pressure regulator 60 with the diaphragm 11
The second embodiment of the present invention used is shown below.
The reference numeral 11 denotes a valve body 51 having a peripheral edge and a control unit 62 constituting a cover.
The control unit 62 is sandwiched between the base 61 and the base 61, and is configured to output air having a pressure corresponding to the input electric signal from the switching valve 63, and the diaphragm 11 is displaced by this air pressure. Reference numerals 61a and 64 in FIG.
The output flow path of the switching valve opened in 1 and the feedback flow path of the second port 54 (not shown).

Since the other structure of the valve body 51 in the regulator 60 and the operation of opening and closing the valve seat by the diaphragm 11 are the same as those in the first embodiment, the same main parts in the drawings are designated by the same reference numerals and the details will be described. Detailed description is omitted.

FIG. 11 shows a third embodiment of the present invention in which the diaphragm 11 is used in the control valve 70 of the manual pressure setting type. The diaphragm 11 of the third embodiment has a peripheral edge between the valve body 51 and the cover 71. A pressure adjusting spring 72, which is sandwiched and whose biasing force is adjustable, acts on the shell 15.

Since the other structure and operation of the third embodiment are the same as those of the first embodiment, the same reference numerals are given to the same main parts in the drawings,
Detailed description is omitted.

FIG. 12 shows a fourth embodiment of the present invention in which the diaphragms 11 and 41 are used in the pressure control valve 80. The diaphragm 11 is a valve body.
The diaphragm 41 is sandwiched between the base 81 and the cover 82 between the base 51 and the base 81.
A spring seat that receives the biasing force of the pressure adjusting spring 83 is attached to 43.

The pressure control valve 80 includes a feedback chamber 85 to which the fluid in the second port 54 is fed back by a passage (not shown), and the acting force of the fluid pressure in the feedback chamber 85 is greater than the urging force of the pressure adjusting spring 83. When it is large, the ball 86 forming the nozzle flapper closes the pressure chamber 87 and its fluid pressure rises, and when it is small, the ball 86 is adsorbed by the magnetic substance 88 and the pressure chamber 87 is opened and its fluid pressure drops. To do.

Since the structure of the valve body 51 of the pressure control valve 80 and the valve seat opening / closing action of the diaphragm 11 are the same as those in the third embodiment, the same reference numerals are given in the drawings and detailed description thereof will be omitted.

Of course, in these embodiments, other diaphragms can be used instead of the diaphragm 11.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a first embodiment of the present invention, FIG. 2 is a sectional view showing an essential part, FIGS. 3 and 4 are plan views of one aspect of a diaphragm and AA section in FIG. Figures, 5 and 6
The drawing is a plan view of the second embodiment of the diaphragm and B of FIG.
-B sectional view, FIG. 7 is a plan view of a third aspect of the diaphragm, FIGS. 8 and 9 are plan views of a fourth aspect of the diaphragm, and CC sectional view of FIG. 8 and FIG. 12 to 12 are vertical front views of the second to fourth embodiments. 1,51 …… Valve body, 11,21,31,41 …… Diaphragm, 13,24,32,43 …… Pressure receiving surface.

Claims (1)

[Scope of utility model registration request] 1. A first port and a third port opened on one surface facing the back, a second port opened on the other surface, and a first port.
A valve body having a first valve seat in a flow passage that communicates the port and the second port, and having a substantially rectangular cross section in which the length in the opening direction of the port is longer than the length in the direction orthogonal to this; A cover which covers the valve body, a diaphragm whose peripheral edge is sandwiched between the valve body and the cover, a flow path which connects the first port and the third port, and a second valve seat which faces the diaphragm at the tip of the flow path. And a valve element that is movably inserted into the flow path to open and close the first valve seat, and is displaced depending on the magnitude of the fluid pressure and the acting fluid pressure of the second port that opposes the diaphragm. A diaphragm-type pressure control valve that opens and closes a first valve seat and a second valve seat by moving a valve body with a diaphragm, in which a port opening direction of the valve body is orthogonal to a pressure receiving portion of the diaphragm. Made longer non-circular A diaphragm type pressure control valve characterized by the following.