JPS634858Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a diaphragm valve.

In the conventional diaphragm valve, as shown in FIG. 1, the diaphragm 7' is screwed and fixed to the pressing body 5' with mounting screws 8', so the valve stem 42' is moved downward to remove the body 1'. presser foot 1
When closing valve 2', diaphragm 7'
2', the vicinity of the mounting screw 8' has no function to follow the pressure of the diaphragm between the pressing body 5' and the flange of the mounting screw 8', and the contact between the flange and the holding part 12' Since only the diaphragm 7' between them is pressed, the diaphragm 7' is not sufficiently pressed against the holding part 12' by the pressing body 5', and the elasticity of the diaphragm 7' cannot be fully utilized. For this reason, when the valve is closed, the contact surface between the holding part of the body and the diaphragm changes greatly depending on the degree of threading of the mounting screw, and the handle torque fluctuates greatly. The drawback was that the water could not be shut off even if the valve was turned on.

The present invention attempts to eliminate the above-mentioned drawbacks by making a connecting member, one end of which is embedded in the diaphragm, slidable relative to the pressing body in an engaged state.

Hereinafter, the present invention will be explained with reference to an embodiment of the drawings.

FIG. 2 is a partially sectional front view of an embodiment of the present invention, and FIG. 3 is an enlarged sectional view of the main part of FIG. 2.

1 is the body, 2 is the bonnet, 3 is the handle,
4 is a spindle, 5 is a pressing body, 6 is an indicator, each made of a chemical-resistant material such as synthetic resin such as polyvinyl chloride, 7 is a diaphragm,
Made of elastic material such as rubber or Teflon (registered trademark) resin.

The body 1 has a through hole 11 between both ends, a holding part 12 at the center of the interior, a diaphragm attachment 13 above the center, and flanges 14 on the outside of both ends.

The bonnet 2 is tapered toward the top, and a flange 21 is provided on the outside of the large diameter end.
A spindle insertion hole 22 is provided at the small diameter end.

The spindle 4 is constructed by screwing together a valve stem 42 having a male thread on the outer circumference inside an outer cylinder 41 having a flange 411 on the outside of the center and a female thread on the inner circumference.

One end of the spindle 4 is inserted into the bonnet 2, the flange 411 of the outer cylinder 41 is brought into contact with the inner surface of the peripheral edge of the through hole 22 of the bonnet 2 via the bearing 43, and the other end is inserted into the through hole 22 and inserted into the bonnet. 2
is derived outside of. A pressing body 5 is attached to the end of a valve stem 42 in the bonnet 2 of the spindle 4 with a dowel pin 9.

A pressing body metal fitting 51 is fitted into the center of the pressing body 5 from the spindle 4 side. The pressing body metal fitting 51 is a cylindrical body having a square rotation stopper 511, and has a through hole 512 formed therein, as shown in FIG. are combined.

Reference numeral 8 denotes a connecting member that connects the diaphragm 7 to the pressing body metal fitting 51, as shown in FIGS.
A collar 81 is provided at one end, and this collar 81 is embedded and fixed in the center of the diaphragm 7. The other end of the connecting member 8 projects from the diaphragm 7 in a cylindrical shape, and this projecting portion 82 has an annular groove 88 extending in the circumferential direction.
21 is formed, and a flat surface 822 that substantially coincides with the bottom surface of the annular groove 821 is formed on a part of the peripheral surface of the end thereof.

In order to engage the protrusion 82 of the connecting member 8 with the through hole 512 of the presser metal fitting 51 of the presser 5, the flat surface 822 of the tip of the protrusion 82 is inserted into the presser metal fitting 51.
The pin 52 may be inserted into the through hole 512 in accordance with the position of the pin 52 in the through hole 512, and then the pin 52 may be inserted into the base, and then rotated in the circumferential direction so that the pin 52 is located within the annular groove 821 of the protrusion 82. .

In the present invention, when the buried portion of the diaphragm 7 of the connecting member 8 is compressed and deformed, the protruding portion 82 slides inwardly within the through hole 512 of the pressing body fitting 51 by that amount. For this purpose, it is preferable to make the annular groove 821 wide and appropriately determine the fitting position of the pin 52.

In this way, the protruding portion 82 of the connecting member 8 is engaged with the pin 52 protruding into the through hole 512 of the pressing member fitting 51 in its annular groove 821, so that the pressing member 5 is engaged with the movement of the balm stem 42. When the pin 52 is moved in accordance with this, the connecting member 8 moves by engaging the pin 52 with the edge of the annular groove 821, and the diaphragm in which one end of the connecting member 8 is embedded can be moved to open and close.

In addition, in the present invention, the pin 52 is located at the protrusion 8 of the connecting member 8.
2 may be fitted into the through hole 521 of the pressing member metal fitting 51 and then fitted into the pin hole for assembly. In this case, the flat surface 822 at the tip of the protrusion 82 may not be provided.

Further, the pin 52 may be fitted such that its tip is positioned within the annular groove 821 of the protrusion 82.

A handle 3 and an indicator 6 are attached to the ends of the outer cylinder 41 of the spindle 4 and the valve stem 42, respectively. The peripheral edge of the diaphragm 7 is sandwiched between the diaphragm mounting edge 13 of the body 1 and the flange 21 of the bonnet 2 and tightened with bolts at appropriate intervals to form a diaphragm valve.

In the diaphragm valve configured as described above, when the handle 3 is turned, the outer cylinder 41 of the spindle 4 rotates, the valve stem 42 screwed into the outer cylinder 41 moves up and down, and the valve stem 42 is attached to the valve stem 42. A pressing body 5 and a diaphragm 7 connected to the pressing body 5 by a connecting member 8 open and close the space between the pressing body 12 and the holding part 12 of the body 1.

In the above embodiment, the pressing body 5 and the pressing body fitting 51 are assembled as separate parts, but they may be integrally molded as long as they are made of the same material. However, in this case, pin 5
A long through hole is required to fit the two.

In addition, by incorporating an insert made of anti-corrosion material such as stainless steel, brass, or other metal into the periphery of the diaphragm 7 sandwiched between the diaphragm mounting edge 13 of the body 1 and the flange 21 of the bonnet 2, the bolt This results in more uniform tightening, no local creep, and no liquid leakage.

The diaphragm valve of the present invention has the above-described structure, and the protruding part of the connecting member is fitted into the through hole of the pressing body, so that the annular groove provided in the protruding part and the pin fitted to the pressing body are engaged. Since the connecting member is able to slide in the axial direction within the through hole of the pressing body, when the diaphragm is pressed by the pressing body against the holding part of the body to close the valve, when the diaphragm is pressed, the connecting member is pushed deep into the through hole of the pressing body, and the entire thickness of the diaphragm can be used as a compression allowance.Therefore, the diaphragm can always be pressed with a uniform handle torque, resulting in excellent water-stopping properties.

In addition, in the embodiment shown in the figure, in which a flat surface is formed at the tip of the protrusion of the connecting member, the diaphragm can be attached to the pressing body by simply inserting the connecting member into the pressing body and rotating the connecting member in the circumferential direction. It is easy and reliable.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a conventional diaphragm valve, Fig. 2 is a partially sectional front view showing an embodiment of the present invention, and Fig. 3 is an enlarged view of the main parts of Fig. 2. FIG. 4 shows an example of a pressing body metal fitting, A is a plan view, B is a partially sectional front view,
FIG. 5 shows an example of a connecting member, in which A is a plan view and B is a front view. 1... Body, 12... Presser section, 2... Bonnet, 3... Handle, 4... Spindle, 41
... Outer cylinder, 42 ... Balm stem, 5 ... Pressing body, 51 ... Pressing body metal fitting, 512 ... Through hole, 52
... Pin, 6 ... Indicator, 7 ... Diaphragm, 8 ... Connection member, 82 ... Projection, 82
1... Annular groove, 822... Flat surface.

Claims (1)

[Scope of utility model registration request] A diaphragm is pressed by a pressing body attached to the valve stem to close the valve, and the diaphragm is attached to the holding part of the body by engaging the pressing body at one end with a connecting member embedded in the diaphragm. In the diaphragm valve made of
The pressing body is formed with a through hole into which the protruding portion can be inserted, and the protruding portion of the connecting member is inserted into the through hole of the pressing body, and a pin that communicates with the annular groove of the protruding portion from the circumferential surface of the pressing body is formed. A diaphragm valve, wherein the connecting member is slidably engaged within the through hole of the pressing body in the axial direction of the through hole.