JP3383945B2 - Auto drain valve for filter regulator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter regulator, which is a pressure regulating valve having a filter function,
The present invention relates to an auto drain valve that automatically discharges drain.

[0002]

2. Description of the Related Art FIGS. 4 to 6 show a conventional differential pressure type auto drain valve in a filter regulator. In this differential pressure type auto drain valve, the inside of the drain case 101 having the cylindrical filter element 100 built therein is divided into upper and lower chambers 103 and 104 by a piston type valve body 102. When there is no air consumption on the secondary side, the upper chamber 103
The pressure in the lower chamber 104 is the same as that in the lower chamber 104, and the packing 1 fixed to the lower convex portion 102a of the piston type valve body 102
As shown in FIG. 4, 05 seals the valve seat 108 leading to the drain discharge port 107 of the manual discharge element 106, and the lower chamber 1
04 and the drain outlet 107 are closed.

At the moment when air is consumed on the secondary side, the pressure in the upper chamber 103 drops faster than that in the lower chamber 104.
A pressure difference is generated between the upper and lower chambers 103 and 104, and as shown in FIG.
05 separates from the valve seat 108, and the lower chamber 104 and the drain discharge port 107 are opened. Therefore, the drain outlet 1
The air is discharged from 07 and the drain case 10
If there is a drain inside 1, the drain is also discharged to the outside.

When the air is discharged (and the drain is also discharged), the pressure in the lower chamber 104 becomes lower than that in the upper chamber 103, so that the piston type valve body 102 descends and the packing 10 is discharged.
5 seals the valve seat 108 and the space between the lower chamber 104 and the drain outlet 107 is closed again. If the air continues to be consumed as it is, the pressures in the upper chamber 103 and the lower chamber 104 become equal again, and the packing 105 continues to seal the valve seat 108.

The valve seat 108 is separated from the manual ejector 106 and is slidable up and down.
Has a screw and can be moved up and down by turning. When the manual discharger 106 is rotated and lowered as shown in FIG. 6, the valve seat 108 is lowered by the pressure in the lower chamber 104 and separated from the packing 105, and air and drain are discharged. When the manual discharging element 106 is raised in the opposite direction, the valve seat 108 is lifted and the packing 105 seals again.

[0006]

However, such a differential pressure type auto drain valve has the following problems.
The differential pressure between the upper and lower sides of the piston type valve element is used, but the differential pressure is not always large, so the operation is unstable.
Does not work at low flow rates. In order to ensure the reliability of the operation of the piston type valve element, the operating conditions must be such that the solenoid valve is installed nearby.

The object of the present invention is to eliminate such problems and to ensure that the opening and closing of the filter regulator, which is the main valve, and the opening and closing of the drain valve are always carried out integrally to enhance the certainty of the operation of the drain valve. Also, it is to simplify the structure as compared with the conventional one.

[0008]

SUMMARY OF THE INVENTION The present invention is provided between an import port and an out port provided on a regulator body.
In a filter regulator that arranges a filter element and a pressure regulating valve seat and adjusts the secondary pressure by opening and closing the valve opening of this pressure regulating valve seat with the pressure regulating valve body, at the lower end of the valve shaft that moves integrally with the pressure regulating valve body. , A drain valve body is provided to open and close the drain port provided at the bottom of the drain case, so that when the pressure regulating valve body opens the valve port of the pressure regulating valve seat, the drain valve body also opens the drain port, and it has a cylindrical shape. The valve shaft is slidably inserted into a hollow valve guide that extends through the filter element of (1) to the bottom of the drain case, the valve shaft is guided by the valve guide, and the valve guide and filter element Between,
A space communicating with the valve opening of the pressure regulating valve seat is formed, and a space communicating with the import is formed between the filter element and the drain case.

A part of the pressure regulating valve body may be slidably inserted into the valve guide, and the pressure regulating valve body may also be guided by the valve guide.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. 1 is a cross section when the valve is closed, FIG. 2 is a cross section when the valve is open, and FIG.

In this filter regulator, a bonnet 2 of a pressure adjusting mechanism is attached to an upper side of a regulator body 1, and a drain case 3 for a filter element and a drain valve is attached to a lower side thereof. Since the structure of the regulator main body 1 itself and the inside of the bonnet 2 are well known, the regulator main body 1 has the import 4 and the out port 5 formed on the opposite surfaces, and the pressure regulating valve seat 6 is provided inside. There is.

Inside the bonnet 2, the regulator body 1
Diaphragm 7 that separates the side and this diaphragm 7
Is provided with a pressure adjusting spring 8 for pressing downwardly, a spring receiver 9 for receiving the upper end thereof, and a pressure adjusting screw 10 for moving the spring receiver 9 up and down. Pressure adjusting spring 8 acting on the diaphragm 7
The spring force of can be adjusted.

A pressure regulating valve body 12 is arranged in the regulator body 1. The pressure regulating valve body 12 has a poppet valve structure for opening and closing the valve opening 6a of the pressure regulating valve seat 6 from below. An upper end portion of the stem 13 provided on the upper surface of the pressure regulating valve body 12 constitutes an exhaust valve 15 together with an exhaust valve seat 14 attached to the center of the diaphragm 7.

Next, the structure of the auto drain valve according to the present invention provided in the drain case 3 will be described.

A long hollow valve guide 16 and a cylindrical filter element 17 are installed in the drain case 3 so as to be concentrically arranged with the drain case 3 around the valve guide 16. Between the filter element 17 and the filter element 17, a space communicating with the valve opening 6a of the pressure regulating valve seat 6 is formed, and a space communicating with the import 4 is formed between the filter element 17 and the drain case 3.

The valve guide 16 includes a filter element 17
Through the bottom to the center of the bottom of the drain case 3,
The lower end is screwed and held by a small packing housing 18 fitted to the convex portion 3a at the center of the bottom.

The upper end portion 16a of the valve guide 16 has a larger diameter than the other portions, and inside the upper end portion 16a,
The pressure regulating valve body 12 is slidably fitted, and a valve spring 19 for pressing the pressure regulating valve body 12 against the pressure regulating valve seat 6 is provided.
Are arranged.

A valve shaft 20 having an upper end fixed to the pressure regulating valve body 12 is slidably inserted into the valve guide 16. The valve shaft 20 slides up and down while being guided by the valve guide 16 integrally with the pressure regulating valve body 12. A small drain valve body 21 is integrally provided at the lower end of the valve shaft 20. This drain valve body 21 includes a circular valve portion 21b at the lower end of a short shaft portion 21a.
The shaft portion 21a penetrates the packing 22 held in the packing housing 18, and the valve portion 2a
1b has a poppet valve structure that abuts and seals the packing 22 from below. Therefore, the packing 22 also serves as the valve seat of the drain valve body 21.

The packing housing 18 includes a packing 2
A drain port 23, which is a vertical hole, is provided below the holding position of No. 2, and a plurality of horizontal holes 24 that open into the drain case 3 are provided above the holding position of the packing 22. . An orifice 23a is formed in the middle of the drain port 23 to reduce the pressure drop.

To explain the operation, as shown in FIG. 1, when the pressure regulating valve body 12 is pressed against the pressure regulating valve seat 6 to close the valve opening 6a from the lower side, the valve portion 21b of the drain valve body 21 is also closed. The packing 22 is brought into contact with the packing 22 from below, and the drain port 23 is sealed in the packing housing 18.

When the secondary pressure on the side of the out port 5 decreases, the pressure regulating valve body 12 descends while compressing the valve spring 19 as shown in FIG. 2, and when it separates from the pressure regulating valve seat 6, this pressure regulating valve body is released. 1
The drain valve body 21 is also lowered integrally with the valve 2, the valve portion 21b thereof is separated from the packing 22, and the drain port 23 is opened. As a result, the drain inside the drain case 3 is discharged from the drain port 23 together with the air through the lateral hole 24.

When the pressure regulating valve body 12 rises and returns to the state of FIG. 1, the drain valve body 21 also rises and returns to close the drain port 23 again.

In the illustrated example, both the pressure regulating valve body 12 and the drain valve body 21 have a poppet valve structure, but the invention is not limited to this. Further, although the gas such as the air from the import 4 flows through the cylindrical filter element 17 from the outside to the inside to be filtered, the filter regulator is shown. On the contrary, the gas from the import 4 is a cylinder. The shape may be such that it flows from the inside of the filter element 17 to the outside and is filtered. The drain port 23 and the packing 22 may be provided in the drain case 3 itself.

[0024]

As described above, according to the present invention, the drain valve body for opening and closing the drain port provided at the bottom of the drain case is provided at the lower end of the valve shaft that moves integrally with the pressure regulating valve body. Since the drain valve body also opens the drain opening when the valve opening of the pressure regulating valve seat is opened, the drain valve can always be opened and closed integrally with the regulator, which is the main valve, and the operation of the drain valve is reliable. Moreover, the structure becomes simpler than before.

Further, since the valve shaft connecting the pressure regulating valve body and the drain valve body is slidably inserted and guided in the hollow valve guide extending to the bottom of the drain case, the drain valve body is regulated. It can be operated stably by following.

Further, the valve guide is penetrated through the cylindrical filter element to form a space between the valve guide and the filter element, the space communicating with the valve port of the pressure regulating valve seat, and the filter element and the drain case. Since a space communicating with the import is formed, the size can be reduced as a whole.

According to the second aspect of the present invention, since a part of the pressure regulating valve body is slidably inserted into the valve guide and the pressure regulating valve body is also guided by the valve guide, the pressure regulating valve body and the drain valve are provided. The body can operate more stably together.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an example of the present invention when a valve is closed.

FIG. 2 is a sectional view when the valve is open.

FIG. 3 is an external front view.

FIG. 4 is a sectional view of a conventional example of a differential pressure type when a valve is closed.

FIG. 5 is a sectional view of a conventional example when a valve is opened.

FIG. 6 is a sectional view of a conventional example when a valve is manually opened.

[Explanation of symbols]

1 Regulator body 3 drain case 4 Import 5 Outport 6 Pressure regulating valve seat 6a valve mouth 12 Regulator valve body 16 valve guide 20 valve shaft 21 Drain valve body 22 Packing 23 Drain port

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) F16T 1/00-1/48 B01D 46/00 G05D 16/00

Claims (2)

(57) [Claims] 1. A secondary pressure is provided by arranging a filter element and a valve seat for pressure regulation between an import port and an out port provided in a regulator body, and opening and closing a valve port of the valve seat for pressure regulation by a pressure regulating valve body. In the filter regulator for adjusting the pressure regulating valve body, a drain valve body that opens and closes a drain port provided at the bottom of the drain case is provided at the lower end of the valve shaft that moves integrally with the pressure regulating valve body. The drain valve body also opens the drain port when the valve port is opened, and the valve shaft is slidably inserted into a hollow valve guide that extends through the cylindrical filter element to the bottom of the drain case. The valve shaft is guided by the valve guide, and a space communicating with the valve port of the pressure regulating valve seat is formed between the valve guide and the filter element, and the space between the filter element and the drain case is formed. , The automatic drain valve filter regulator, characterized in that the formation of the space communicating with the import. 2. An automatic drain valve for a filter regulator according to claim 1, wherein a part of the pressure regulating valve body is slidably inserted in the valve guide, and the pressure regulating valve body is also guided by the valve guide. .