JPS5914808Y2 - pressure regulator - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pressure regulator for compressed air (air) used to drive pneumatic equipment such as air cylinders, and the present invention relates to a pressure regulator that can easily release the pressure on the secondary side. The purpose is to realize a vessel.

Generally, primary air from a pressure air source is adjusted to a predetermined pressure by a pressure regulator and then supplied to pneumatic equipment such as cylinders. However, when inspecting or repairing these pneumatic equipment, , it is necessary to release the air in the secondary piping after the regulator to the atmosphere.

Conventionally, for this purpose, a three-way switching valve is installed downstream of the pressure regulator so that the secondary air can be released to the atmosphere.

However, since the 3-way switching valve described above must be connected to the relatively large-diameter main piping for the secondary air, a large switching valve must be used, and a non-switching valve must be used. There are problems such as the need for space for connection.

Therefore, the present invention was devised in view of the above problems, and its purpose is to provide a diaphragm type pressure regulator itself with a secondary pressure release function.

A conventionally used diaphragm pressure regulator is generally shown in FIG.

In the figure, when the handle 1 is turned clockwise to tighten, the pressure regulating spring 2 pushes the diaphragm 3 and pushes the valve stem 4 down.

In other words, when the force of the pressure regulating spring 2 acting on the diaphragm 3 becomes greater than the lower air pressure, the diaphragm 3 descends, pushing down the valve stem 4 and pushing the main valve 5 open, causing compressed air to flow to the primary side A. begins to flow to the secondary side B.

When the compressed air in the secondary side B is consumed, the diaphragm 3
The lower air pressure decreases, the pressure applied to the diaphragm of the pressure regulating spring 2 relatively increases, and the main valve 5 is further opened to supply more compressed air to the secondary side B.

When supplied, the pressure in the secondary side B increases and pushes up the diaphragm 3, but along with this, the valve stem 4 and main valve 5 are pushed up in the valve closing direction by the closing spring 6, and the set pressure is maintained. dripping

In self-relief, when the pressure at the secondary side B continues to increase, the diaphragm is pushed up, and the self-relief tooth seal moves away from the upper end of the valve stem 4 to open the valve.
Excess pressure coming from the secondary side B is released to the atmosphere through the hole 8 in the bonnet.

In such a conventional pressure regulator with a relief valve, in order to release the air on the secondary side B to the atmosphere (to normal pressure), loosen the handle 1 by turning it all the way and lower the regulator setting pressure to relieve the air. However, it is not easy to rotate the handle 1 many times.

Also, when resetting after maintenance, it is necessary to carefully turn the handle and set the pressure to the set pressure.

In order to avoid this inconvenience, a three-way switching valve is usually provided on the secondary side as described above, but in this case a particularly large switching valve must be provided.

Therefore, in order to solve this problem, the present invention is a diaphragm pressure regulator in which the valve seat that brings the main valve into and out of contact can move in the axial direction of the valve stem, and as the valve seat moves. The valve stem is configured to move in the direction of opening the relief valve.

Next, an embodiment of the pressure regulator according to the present invention will be described based on FIGS. 2 to 4.

In this figure, parts corresponding to those in FIG. 1 are given the same reference numerals.

A main valve 5 is installed between the primary side (inlet port) A and the secondary side (outlet port) B, and is pressed against a valve seat 9 by a closing spring 6.

A valve stem 4 fixed to the main valve 5 is interposed between the main valve 5 and the main disk 3' of the pressure regulating diaphragm 3, and a disk seal 7 is provided at a position where the upper end of the valve stem 4 of the disk 3 comes into contact. ing.

That is, a communication hole 11 is provided in the center of the disk 3', which communicates the diaphragm chamber 10 with the atmosphere communication hole 8.
An annular sealing material 7 is installed at its lower end.

When the upper end of the valve stem 4 comes into contact with the disc seal 7 as shown in the figure, the communication hole 11 is closed, and when the upper end of the valve stem 4 and the disc seal 7 are separated, the communication hole 11 opens.
The diaphragm chamber 10 communicates with the atmosphere communication hole 8.

The diaphragm chamber 10 and the secondary port B communicate with each other through a small hole 21.

A pressure regulating spring 2 is pressurized and supported by the diaphragm 3 from the side opposite to the diaphragm chamber 10, and the pressure of the pressure regulating spring 2 is adjusted and set by operating the handle 1.

In the case of the present invention, the valve seat 9 is formed at the end of a cylindrical body 12, and the valve seat tube 12 is disposed concentrically with the valve stem 4 in a cylindrical guide portion 13 formed in the main body. The valve stem 4 is inserted into the valve stem 4 so as to be slidable along the cylindrical guide portion 13 in the axial direction of the valve stem 4.

A gasket 1 is provided between the outer periphery of the valve seat cylinder 12 and the cylindrical guide portion 13.
4. Sealed at 14'.

A circumferential groove 15 is formed in the inner wall of the cylindrical guide part 13 between the packings 14 and 14', and the groove 15 communicates with a communication hole 16 to the atmosphere.

On the other hand, a valve hole 17 is bored in the side wall of the valve seat portion 12 to communicate between the inside and outside of the wall portion. Although it is at a different level from the circumferential groove 15, it is provided at a position that coincides with the circumferential groove 15 when the valve seat cylinder 12 is lowered as shown in FIG.

Two or more valve holes 17 may be provided. Various means can be considered to slide the valve seat cylinder 12 up and down, but for example, an eccentric shaft as shown in FIG. 4 is also effective.

That is, the rotating shaft 19.19' rotated by the knob 18.
is pivotally supported by the main body, and an operating shaft 20 eccentric from the center of the rotating shaft is provided between both rotating shafts 19 and 19'.
The operating shaft 20 is arranged to move up and down during one rotation of 9.19'.

Then, by positioning the operating shaft 20 above the valve seat cylinder 12 and turning the knob 18 so that the operating shaft 20 comes to the upper side as shown in FIG. When the valve seat tube 12 is pushed up by the closing spring 6 through the opening and the knob is turned half a turn so that the operating shaft 20 comes to the bottom as shown in FIG.
It is pushed down by the operating shaft 20 against the closing spring 6.

Next, the operation will be explained.

Normally, as shown in FIG. 2, the operating shaft 20 is positioned upward and the valve seat cylinder 12 is raised.

That is, the valve seat cylinder 12 is moved in a direction in which the upper end of the valve stem 4 approaches or contacts the disk seal 7.

In this state, it is functionally the same as that in Figure 1,
When the air pressure in the diaphragm chamber 10 is lower than the pressure in the pressure regulating spring 2, the main valve 5 is pushed down and opened via the valve stem 4, causing the supply from the primary port (A) to the secondary port (A). It bothers me,
A pressure regulating effect is performed.

When the secondary side pressure becomes excessive, the diaphragm 3
As the disc seal 7 opens away from the upper end of the valve stem 4, the secondary pressure changes from the small hole 21 to the diaphragm chamber 10 to the disc seal free communication hole 11 to the atmosphere communication hole 8 to the atmosphere. It leaks out and self-relieve.

When releasing the secondary side pressure to the atmosphere for inspection of equipment connected to the secondary side, etc., the operating shaft 20 is moved downward and the valve seat cylinder 12 is pushed down as shown in FIG.

Then, the valve seat 9 comes into contact with the main valve 5, and the gap between the primary and secondary ports A and B is closed, and the main valve 5 is pushed down by the valve seat cylinder 12, and the valve stem 4 is also lowered. do.

Therefore, the upper end of the valve stem 4 is forcibly separated from the disc seal 7, and the communication hole 11 is opened.

As a result, the secondary air flows from the small hole 21 → the diaphragm chamber 10 → the tissue sealer → the communication hole 11 → the atmosphere communication hole 8.
, and are exhausted in this order until the secondary side pressure reaches atmospheric pressure.

At this time, if the orifice 21 for introducing secondary side pressure is made large, it will adversely affect the response characteristics of the pressure regulator, etc.
It is preferable that the orifice 21 has a small diameter.

However, if the secondary side pressure is discharged only from such a small diameter orifice 21, it takes time to discharge the secondary side pressure due to the flow resistance in the orifice.

However, in the case of the present invention, when the disc seal is opened by lowering the valve stem, the valve hole 17 in the side wall of the valve seat cylinder 12 communicates with the atmosphere communication hole 16 via the annular groove 15, so the secondary air flows through the valve hole. 17 are also released into the atmosphere.

Therefore, compared to the case of discharging only from the communication hole 11 of the disk, the secondary side pressure is released quickly, and the waiting time until the secondary side pressure decreases is shortened, which is efficient.

As described above, according to the present invention, the valve seat is movable parallel to the valve stem, and when the secondary side pressure is released, the valve seat pushes down the main valve and the valve stem, and the valve stem is forcibly separated from the disc seal. In order to open the relief passage in the diaphragm disk, the secondary pressure can be released to atmospheric pressure.

Moreover, at this time, since the side wall of the cylindrical body on which the valve seat is formed has a valve hole in a position communicating with the atmosphere communication hole, the secondary side pressure is also released from this valve hole, and the secondary side pressure is released. done in a short time.

[Brief explanation of drawings]

FIG. 1 is a central vertical cross-sectional view of a conventional diaphragm pressure regulator, and FIGS. 2 and 3 are central vertical cross-sectional views showing the pressure regulator of the present invention in its normal state and when the secondary side pressure is released, respectively. FIG. 4 is a longitudinal sectional view showing the valve seat front operating mechanism. In the figure, 3 is a diaphragm, 4 is a valve stem, 5 is a main valve, 7 is a disc seal, 9 is a valve seat, 11 is a relief communication hole, 12 is a valve seat cylinder, 13 is a valve seat cylinder guide, and 15 is an annular shape. 16 is an atmospheric communication hole, 17 is a valve hole, and 20 is an operating shaft.

Claims (2)

[Scope of utility model registration request] (1) A pressure regulating spring is pressurized on one side of the diaphragm,
The other side faces a diaphragm chamber communicating with the secondary port, and a valve stem is interposed between the main valve and the diaphragm, which closes when the valve stem comes into contact with the diaphragm side and opens when it separates. In a pressure regulator that has a relief valve mechanism that communicates the chamber with the atmosphere, the valve seat that connects and separates the main valve is
A pressure regulator characterized in that it is configured to be able to move in the axial direction of the valve stem, and to allow the valve stem to move in the direction of opening a relief valve as the valve seat moves. (2) The valve seat is formed at an end of a cylindrical body that can move in the axial direction of the valve stem, and is formed on the side of the cylindrical body when the valve stem moves in the direction of opening the relief valve. A pressure regulator according to claim (1) of the utility model registration, characterized in that the pressure regulator is provided with a valve hole for rapid exhaust that communicates with the atmosphere.