JPS622654Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-powered pressure reducing valve that is interposed in the middle of a fluid supply pipe, such as city gas, and is used to maintain secondary pressure at a predetermined pressure.

Referring to FIG. 1, a conventional self-powered pressure reducing valve has a valve body 2 and a valve seat 3 interposed in the middle of a supply pipe 1 for a fluid such as city gas, and the valve body 2 is connected to a diaphragm 4. be done. Diaphragm 4 is drive chamber 5
The pressure setting spring 6 elastically urges the diaphragm 4 in the direction in which the opening degree of the valve body 2 becomes larger.
The drive chamber 5 is communicated with the secondary side of the supply pipe 1,
The pressure within the drive chamber 5 and the spring force of the pressure setting spring 6 are balanced, thereby controlling the opening degree of the valve body 2. In order to adjust the spring force of the pressure setting spring 6 in such a self-powered pressure reducing valve, a person must go to the location where the self-powered pressure reducing valve is installed and change the spring force, and the set pressure must be changed every day. If it is necessary to do so, it requires a great deal of effort.

The present invention solves the above-mentioned technical problems, and allows the spring force of the pressure setting spring to be changed automatically by remote control or by using a timer, etc., and also allows the initial setting spring force of the pressure setting spring to be changed automatically. The purpose of the present invention is to provide a self-powered pressure reducing valve that can be changed freely.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a system diagram of an embodiment of the present invention.
A pressure reducing valve 12 is interposed in the middle of the city gas supply pipe 11, and this pressure reducing valve 12 is controlled by the action of a control means 13. The pressure reducing valve 12 is a valve body 14
and a valve seat 15, and the valve body 14 is driven by the drive section 12a of the pressure reducing valve 12.

FIG. 3 is an enlarged sectional view of the vicinity of the drive portion 12a of the pressure reducing valve 12. The drive unit 12a defines a diaphragm chamber 16 that communicates with the secondary side of the supply pipe 11, and includes a diaphragm 17 to which the valve body 14 is connected via a valve stem 14a, and one end of which is connected to the diaphragm 17 to open the diaphragm 17. The pressure setting spring 18 biases in the valve operation direction (downward in FIG. 3), supports the other end of the pressure setting spring 18, and moves only in the expansion/contraction direction of the pressure setting spring 18 (up and down in FIG. 3). a free receiving member 19 and a body 20 of the pressure reducing valve 12 on the opposite side of the pressure setting spring 18 with respect to the receiving member 19;
an auxiliary diaphragm 22 as a pressure receiving body fixed to and defining a pressure receiving chamber 21;
a first blocking body 24 that is fixed to the center of the pressure receiving chamber 21 and comes into contact with a first contact surface 23 on the opposite side of the auxiliary diaphragm 22 of the pressure receiving chamber 21 as shown in FIG. 3 when the pressure of the pressure receiving chamber 21 is at the lower limit; One end is screwed into the receiving member 19 and passes through the first blocking body 24 rotatably and at a constant relative position along the axial direction, and the other end rotatably passes through the main body 20 and extends outward. an extending adjustment rod 25; and a second adjustment rod 25 fixed to the other end of the adjustment rod 25 so as to be adjustable in its axial position, and which comes into contact with the second contact surface 26 of the main body 20 when the pressure in the pressure receiving chamber 21 is at the upper limit value. and a blocking body 27.

The receiving member 19 is fitted into a vertically extending guide groove 28 formed on the inner surface of the main body 20, so that the receiving member 19 is guided by the guide groove 28 and can move forward and backward only in the vertical direction. Receiving member 19
An internal thread 29 is formed on the adjustment rod 25 so that the axes thereof are the same, and an external thread 30 is formed on the adjustment rod 25 to be screwed into the internal thread 29. An outer flange 31 is formed between the receiving member 19 and the auxiliary diaphragm 22 in the middle of the adjustment rod 25, and the first blocking body 2
4 is attached to the outer flange 3 via a sliding member 32 such as Teflon.
1 is supported. The first blocking body 24 has an adjustment rod 25
is inserted rotatably. A member 34 fixes the auxiliary diaphragm 22 to the stepped surface of the outer periphery of the cylindrical member 33.
By pinching the auxiliary diaphragm 2
Fixed to 2. On the side opposite to the outer flange 31 of the first blocking body 24, a retaining ring 3 is attached to the adjustment rod 23.
5 are fitted, whereby the first blocking body 2
The position of the adjustment rod 25 of No. 4 along the axis is fixed.
An external thread 36 is formed at the other end of the adjustment rod 25 outwardly from the main body 20, and a second blocking body 27 consisting of a nut 37 and a retaining nut 39 is screwed into this external thread 36.

The pressure receiving chamber 21 is connected to one of the supply pipes 11 via a pipe line 40.
Connected to the next side. The control means 13 includes a control valve, such as a solenoid valve 41, provided in the middle of the pipe line 40,
It includes a timer 42 that controls opening and closing of the solenoid valve 41 according to a predetermined time period pattern. The pressure receiving chamber 21 is connected to the secondary side of the supply pipe 11 via a pipe line 44 having a throttle 43 in the middle.

Referring to FIG. 4, the timer 42 is set to open the solenoid valve 41 only during the time period, for example, from 16:00 to 20:00, when the gas usage amount Q shown by the broken line is the largest in a day. The solenoid valve 41 is closed during a time period when the usage amount Q of city gas is relatively small, for example from 0:00 to 16:00. In this case, the pressure on the secondary side of the supply pipe 11 acts within the pressure receiving chamber 21 via the pipe line 44. Moreover, since the pressure on the secondary side is acting within the diaphragm chamber 16, the auxiliary diaphragm 22 is displaced upward by the spring force of the pressure setting spring 18 via the adjustment rod 25 and the first blocking body 24. , the first blocking body 24 is brought into contact with the first contact surface 23 . The pressure setting spring 18 is thereby stretched, so that the spring force is kept relatively low. Therefore, the secondary pressure is maintained at a relatively low value P _2a as shown by the solid line in FIG.

Time periods when city gas consumption Q is relatively large,
For example, from 16:00 to 20:00 as shown in FIG. 4, the solenoid valve 41 is opened by the action of the timer 42. Therefore, the pressure on the primary side acts on the pressure receiving chamber 21 through the conduit 40, and the auxiliary diaphragm 22 is pushed downward in FIG. The downward displacement of this auxiliary diaphragm 22 is until the second blocking body 27 comes into contact with the second contact surface 26 as shown in FIG. is moved downwards, thus compressing the pressure setting spring 18. The spring force of the pressure setting spring 18 is increased accordingly, so that the secondary pressure is maintained at a relatively high value P _2b as shown in FIG.

Note that when the solenoid valve 41 is opened, the supply pipe 11
The primary side of the pipe 44 is connected to the secondary side via a pipe 40, but since a throttle 43 is provided in the middle of the pipe 44, the city air flows to the secondary side bypassing the pressure reducing valve 12. Since the amount of gas is suppressed to a very small amount and the flow rate during this period is large, there is no adverse effect due to this.

The solenoid valve 41 is closed when the time period from 16:00 to 20:00 has elapsed when the amount of city gas used Q is relatively large. At this time, the pressure on the primary side acting in the pressure receiving chamber 21 escapes to the secondary side via the conduit 44 provided with the throttle 43, and the pressure on the secondary side comes to act on the pressure receiving chamber 21. Thereby, the secondary pressure is maintained at a relatively low value P _2a in the same manner as described above.

Next, the operation for changing the initial setting pressure of the pressure setting spring 18 will be described. Pressure setting spring 1
When changing the initial setting pressure of 8, use adjustment rod 2.
A wrench or the like is engaged with the protrusion 45 protruding from the other end of the adjustment rod 25 to rotate the adjustment rod 25. By this rotational movement of the adjustment rod 25, the receiving member 19 is screwed forward or backward, and the receiving member 19 and the diaphragm 17
The distance between the pressure setting spring 18 and the pressure setting spring 18 is changed in size, and the pressure setting spring 18 is expanded or contracted accordingly, and the spring force of the pressure setting spring 18 is adjusted.

After adjusting the initial setting spring force of the pressure setting spring 18 in this way, the secondary pressure can be adjusted over a wide range by applying fluid pressure to the pressure receiving chamber 21 as described above.

The control pattern of the timer 42 described above is not limited to the one shown in FIG. 4, and may be such that the solenoid valve 41 is opened at a predetermined time period set during a certain period of time, such as one week or 10 days, depending on the state of use of city gas. You can set it to .

As another embodiment of the present invention, the spring force of the pressure setting spring 18 may be adjusted by supplying compressed air or pressure oil to the pressure receiving chamber 21.

As described above, according to the present invention, the spring force of the pressure setting spring is adjusted by supplying fluid to the pressure receiving chamber and applying large and small pressures to displace the pressure receiving body. The spring force can be changed automatically by remote control or by using a timer or the like. Furthermore, by rotating and operating the adjustment rod, the initial spring force of the pressure setting spring can be easily adjusted from outside the main body of the pressure reducing valve.

[Brief explanation of the drawing]

FIG. 1 is a simplified sectional view of a conventional self-powered pressure reducing valve, FIG. 2 is a system diagram of an embodiment of the present invention, FIG. 3 is an enlarged sectional view of the drive section 12a, and FIG. 4 is a control means 13. FIG. 5 is an enlarged sectional view of the drive section 12a corresponding to FIG. 3. 11... Supply pipe, 13... Control means, 14...
Valve body, 17... diaphragm, 18... pressure setting spring, 19... receiving member, 22... auxiliary diaphragm, 24... first blocking body, 25... adjusting rod, 2
7...Second blocking body.

Claims (1)

[Claims for Utility Model Registration] A valve body interposed in the middle of a pipe for transporting fluid, a diaphragm connected to the valve body and driven in the opening/closing direction of the valve body, one end connected to the diaphragm to drive the diaphragm in the opening/closing direction. A pressure setting spring that is biased in the operating direction, a receiving member that supports the other end of the pressure setting spring and is movable only in the direction of expansion and contraction of the pressure setting spring, and a receiving member that is fixed to the opposite side of the pressure setting spring and that defines a pressure receiving chamber. a pressure receiving body which is fixed to the central part of the pressure receiving body and is capable of contacting a first contact surface of the pressure receiving chamber on the opposite side of the pressure receiving body when the pressure in the pressure receiving chamber is at a lower limit value; a first blocking body that is in contact with the first blocking body, one end of which is screwed to the receiving member;
An adjustment rod that passes through the blocking body rotatably and at a constant relative position along the axial direction, and whose other end rotatably passes through the pressure reducing valve body and extends outward; a second blocking body that is fixed with its position adjustable, and that comes into contact with the second contact surface on the upper part of the main body when the pressure in the pressure receiving chamber is at the upper limit; and a second blocking body that supplies fluid to the pressure receiving chamber to apply large and small pressures. A self-operated pressure reducing valve characterized in that it includes a control means.