JPH07281762A - Master/slave type pressure controller - Google Patents

Abstract

PURPOSE:To provide the master/slave type pressure controller which can reduce dispersion in the flow rate position to start/stop operating a large flow rate reducing valve. CONSTITUTION:Concerning the master/slave pressure controller for supplying gas to be supplied from an outlet part 3 to any other instrument while reducing its pressure over multiple stages, this device is provided with a large flow rate reducing valve 1 for reducing the pressure of gas to be supplied down to specified pressure and supplying it to the outlet part 3, small flow rate reducing valve 2 for supplying that reduced gas to the side of a flow-out port 1b of the large flow rate reducing valve 1 while more highly setting the pressure of pressure reduction than this large flow rate reducing valve 1, small flow meter 6 provided between a flow-out port 2b of this small flow rate reducing valve 2 and the flow-out port 1b side of the large flow rate reducing valve 1, and flow rate control valve 8 provided between a flow-out port 6b of this small flow meter 6 and the flow-out port 1b side of the large flow rate reducing valve 1 so as to regulate the flow of gas from the side of the small flow rate reducing valve 2 to the side of the large flow rate reducing valve 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parent-child pressure regulator capable of reducing the pressure of a supplied gas in multiple stages.

[0002]

2. Description of the Related Art An example of this type of parent-child pressure regulator is shown in FIG. This parent-child pressure regulator
The gas decompressed in the primary decompression chamber A is decompressed by the large flow reduction valve 1 and the small flow reduction valve 2 and supplied from the outlet 3 to other gas equipment and the like.

Gas is supplied to the primary decompression chamber A from, for example, one of two gas cylinders (not shown). However, the gas in the gas cylinder is
What is decompressed via a decompression mechanism (not shown) is supplied to the primary decompression chamber A. Which gas cylinder is selected can be freely selected depending on the rotation direction of the knob 4.

The large flow rate pressure reducing valve 1 further reduces the pressure of the primary pressure reducing chamber A to a prescribed pressure and supplies it to the outlet portion 3. However, in this example, a large flow meter 5 is provided between the large flow pressure reducing valve 1 and the outlet portion 3. Therefore, the gas flowing out from the outflow port 1 b of the large flow rate pressure reducing valve 1 flows through the large flow meter 5 to the outlet 3. In addition, the large flow rate reducing valve 1 has its inflow port 1
The nozzle 11 is provided at a, the valve body 12 that contacts and separates from the nozzle 11, and the pilot mechanism 13 that controls the contact and separation of the valve body 12 with the nozzle 11. The nozzle 11 is
It communicates with the primary decompression chamber A through the inflow port 1a,
The tip portion of the nozzle 11 and the valve body 12 are located in the outflow port 1b.

The pilot mechanism 13 is provided with a pilot chamber B communicating with the outlet portion 3, a diaphragm 131 provided in the pilot chamber B and reciprocating due to a pressure fluctuation of the outlet portion 3, and a displacement of the diaphragm 131 with respect to a valve body. 1
2 and the valve element drive mechanism 132 for driving the valve element 12 so as to separate from and contact the nozzle 11, and the nozzle 1 of the valve element 12.
It is provided with a partition diaphragm 133 that partitions the portion on the first side into the outflow port 1b, and a pilot channel 13a that communicates the portion of the partition diaphragm 133 on the side opposite to the outflow port 1b to the pilot chamber B.

On the other hand, the small flow rate reducing valve 2 is the large flow rate reducing valve 1.
The set pressure for depressurization is set higher, and the depressurized gas is supplied to the outflow port 1b side of the large flow rate depressurization valve 1. However, a small flow meter 6 is provided at the outflow port 2b of the small flow rate reducing valve 2, and the gas flowing out from this small flow rate meter 6 passes through the pilot chamber C and the flow path 7 and the large flow rate reducing valve 1 To the outflow port 1b.

Further, the small flow rate pressure reducing valve 2 has a nozzle 21 provided at its inflow port 2a, a valve body 22 which contacts and separates from the nozzle 21, and a pilot mechanism which controls the contact and separation of the valve body 22 with respect to the nozzle 21. And 23. Nozzle 21
Communicates with the primary decompression chamber A via the inflow port 2a, and the tip end portion of the nozzle 21 and the valve body 22 are connected to the outflow port 2a.
It is located within b.

The pilot mechanism 23 is provided in the pilot chamber C communicating with the outflow port 1b of the large flow rate reducing valve 1 through the flow path 7, and is provided in the pilot chamber C, and is connected to the outflow port 1b of the large flow rate reducing valve 1. A diaphragm 231 that reciprocates due to pressure fluctuations, a valve body drive mechanism 232 that transmits the displacement of the diaphragm 231 to the valve body 22 and drives the valve body 22 to contact and separate from the nozzle 21, and the nozzle 21 of the valve body 22. A partition diaphragm 233 is provided for partitioning the side into the outflow port 2b, and a pilot flow path 23a for communicating a portion of the partition diaphragm 233 opposite to the outflow port 2b with the pilot chamber C.

The small flow meter 6 has an inflow port 6a.
Communicates with the outflow port 2b of the small flow rate reducing valve 2, and the outflow port 6b communicates with the pilot flow path 23a, so that the flow rate of the gas flowing from the outflow port 2b of the small flow rate reducing valve 2 can be measured. Has become. Also, small flow rate reducing valve 2
The outflow port 2b, the inflow port 6a of the small flow meter 6, the outflow port 6b, the pilot flow path 23a, the pilot chamber C, and the flow path 7 have a sufficiently large diameter or width so as not to generate resistance due to the gas flow. Has become. FIG. 6 shows the above configuration as a gas circuit diagram.

In the parent-child pressure regulator configured as described above, for example, if a gas device is used, the gas supplied to the primary decompression chamber A has a large flow reducing valve 1, a large flow meter 5, and an outlet. While being supplied to other gas equipment through the portion 3, the gas that has passed through the small flow rate reducing valve 2 is also supplied to the gas equipment through the large flow rate meter 5 and the outlet portion 3. At this time, on the side of the large flow pressure reducing valve 1, the pressure of the outlet portion 3 is increased by the diaphragm 13.
The valve body 12 is moved via 1 etc., and the nozzle 11 is opened and closed so that the pressure of the outlet part 3 may become regulation pressure. Therefore, the pressure of the outlet portion 3 is reduced to a prescribed safe pressure.

On the other hand, the small flow rate reducing valve 2 has a set pressure higher than that of the large flow rate reducing valve 1, but it is intended to flow a small flow rate of gas, so that the large flow rate of gas should be supplemented. I can't. Therefore, the pressure in the pilot chamber C cannot be increased to the set pressure of the small flow rate reducing valve 2,
The pressure in the pilot chamber C becomes the same as the pressure in the outflow port 1b of the large flow rate pressure reducing valve 1. Therefore, the pressure in the pilot chamber C does not reach the set pressure of the small flow rate reducing valve 1. That is, the pressure at the outlet 3 becomes a regulated and safe pressure that can be set by the set pressure of the large flow rate reducing valve 1.

When the use of the gas equipment is stopped, the outflow of gas from the outlet 3 is stopped and the pressure in the pilot chamber B rises. Then, when the pressure in the pilot chamber B becomes equal to or higher than the set pressure of the large flow rate pressure reducing valve 1, the valve body 12 comes into contact with the nozzle 11 via the diaphragm 131 and the like, and the outflow of gas from the nozzle 11 is stopped. Furthermore, the gas pressure rises, and the pressure in the pilot chamber C is reduced to the small flow rate reducing valve 2
When the set pressure is reached, the valve body 22 comes into contact with the nozzle 21 via the diaphragm 231 and the like, and the gas also stops flowing out from the nozzle 21.

However, when gas leaks from a pipe or the like connected to the downstream side of the outlet portion 3, the pressure at the outlet portion 3 gradually decreases. At this time, the nozzle 21 of the small flow rate reducing valve 2 set to a high pressure opens earlier than that of the large flow rate reducing valve 1, and the gas corresponding to the leakage amount flows.

Therefore, a slight gas leak can be always confirmed by the small flow meter 6, and an accident due to a gas leak can be prevented. In addition, since the set pressure of the small flow rate reducing valve 2 is only slightly higher than the set pressure of the large flow rate reducing valve 1, leakage from the piping or the like does not increase. The pressure in the primary pressure reducing chamber A is also slightly higher than the set pressure of the small flow rate reducing valve 1.

[0015]

By the way, in the above-mentioned parent-child type pressure regulator, if gas is supplied from the small flow rate reducing valve 2 to the outlet portion 3 and the pressure in the pilot chamber C of the small flow meter 6 becomes low. Since the gas is supplied to the side of the pilot chamber C so as to make up for it, the pressure characteristic of the small flow rate reducing valve 2 is as shown by the curve 2 in FIG. 7. That is, when the amount of gas used is gradually increased, the pressure of the outlet portion 3 due to the gas supplied from the small flow rate reducing valve 2 is
It will decrease gradually. Therefore, it becomes very vague whether or not the pressure at the outlet portion 3 reaches the set pressure of the large flow rate reducing valve 1, and the variation X in the flow rate position where the large flow rate reducing valve 1 shown by the curve 1 starts to operate. Has the drawback of being large. (In FIG. 7, the unit of pressure is the height of the water column in mm, and the unit of gas flow rate is in liters per unit time.) The present invention has been made to solve the above-mentioned problems. Then, the objective is to provide the parent-child type pressure regulator which can reduce the dispersion | variation in the flow position of the start / stop of operation of the large flow pressure reducing valve (1).

[0016]

In order to achieve the above object, the invention of claim 1 is to provide a parent-child type pressure regulator for reducing the pressure of the supplied gas in multiple stages and supplying it from the outlet to other equipment. The pressure of the gas to be supplied is reduced to a specified pressure and supplied to the outlet portion, and the set flow rate of the pressure is set higher than that of the large flow rate reducing valve. A small flow rate reducing valve supplied to the outflow port side of the large flow rate reducing valve, a small flowmeter provided between the outflow port of the small flow rate reducing valve and the outflow port side of the large flow rate reducing valve, and this small flowmeter Between the small flow meter side and the large flow rate reducing valve side, and a flow rate control valve that regulates the flow of gas from the small flow rate meter side to the large flow rate reducing valve side. .

The invention of claim 2 is characterized in that the flow control valve is constituted by a fixed throttle. The invention according to claim 3 is characterized in that the flow control valve is constituted by a variable throttle. Further, the invention of claim 4 is characterized in that the flow control valve is detachably provided.

[0018]

According to the invention of claim 1, which is configured as described above, when the flow rate of the gas supplied from the outlet to another device is increased, the outlet, the outlet port of the large flow reducing valve and the small flow reducing pressure are increased. The pressure at the outlet port of the valve drops at about the same pressure. Then, when this pressure reaches the set pressure of the small flow rate reducing valve, gas begins to flow from the outflow port of the small flow rate reducing valve, and this gas flows into the outflow port and outlet of the small flow meter, the flow control valve, the large flow rate reducing valve. And then supplied to other equipment.
When the supply of gas to other devices is further increased, the pressure at the outlet portion decreases, and the flow rate of gas flowing out from the small flow rate reducing valve increases so as to compensate for this pressure. However, as the gas flow rate increases, the resistance in the flow rate control valve increases, and the pressure on the outflow port side of the small flow rate reducing valve reaches the set pressure of the small flow rate reducing valve. Then, since the flow rate of the gas supplied from the small flow rate reducing valve does not increase, the pressure at the outlet and the outflow port of the large flow rate reducing valve sharply decreases. For this reason, this pressure immediately reaches the set pressure of the large flow rate reducing valve, and gas is also supplied from this large flow rate reducing valve.

Therefore, since the large flow rate reducing valve operates reliably at the flow rate position where the pressure of the outlet port of the small flow rate reducing valve reaches the set pressure, the operation of the large flow rate reducing valve is started.
It is possible to reduce variations in the stop flow rate position.

According to the second aspect of the invention, since the flow rate control valve is composed of a fixed throttle, the cost can be kept low. Further, according to the invention of claim 3, since the flow control valve is constituted by the variable throttle, the resistance of the flow control valve can be easily changed. Therefore, the flow rate position where the large flow rate pressure reducing valve operates can be easily set. Furthermore, in the invention of claim 4, for example, in the case of a fixed throttle, the resistance of the flow control valve can be changed by replacing the flow control valve, and the flow rate position at which the large flow pressure reducing valve starts operating. Can be changed freely. Further, even in the case of the variable diaphragm, there is an advantage that it can be changed to one having different characteristics.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. However, elements common to the constituent elements of the conventional example shown in FIGS. 5 to 7 are given the same reference numerals to simplify the description. The parent-child pressure regulator shown in FIGS. 1 and 2 differs from that shown in FIGS. 5 and 6 in that a flow control valve 8 is provided in the flow path 7.

The flow control valve 8 is composed of a fixed throttle, and has a screw formed on the outer peripheral portion thereof.
It is detachably attached to the portion of the flow path 7 on the pilot chamber C side. The principle of the flow control valve 8 is as shown in FIG. That is, the relationship between the flow rate Q of the gas passing through the opening having the throttle diameter D and the pressure loss ΔP is given by the following equation.

D = √ (Q / (0.009 × √ (ΔP))) (1) ΔP = P1-P2 (2) From this equation, the pressure loss ΔP is proportional to the square of the gas flow rate Q. And then increase. In this embodiment, the throttle diameter D is set so that the pressure in the pilot chamber C becomes the set pressure of the small flow rate reducing valve 2 when the gas flow rate Q reaches 100 l / h, as shown in FIG. .

In the parent-child pressure regulator constructed as described above, when the gas flow rate supplied from the outlet section 3 to the gas equipment is gradually increased, the outlet section 3 and the large flow rate pressure reducing valve 1 flow out. Outflow port 2 of port 1b and small flow rate reducing valve 2
The pressure of b, etc. gradually decreases at almost the same pressure. And
When this pressure reaches the set pressure of the small flow rate reducing valve 2, the valve body 22 separates from the nozzle 21 and gas is supplied from this nozzle 21. Then, this gas is supplied to the outflow port 2b of the small flow reducing valve 2, the small flow meter 6, the pilot chamber C, the flow control valve 8, the outflow port 1b of the large flow reducing valve 1,
The gas is supplied to the gas equipment through the large flow meter 5 and the outlet 3. Further, as the supply of gas to the gas equipment is increased, the pressure at the outlet portion 3 further decreases, and the flow rate of the gas flowing out from the small flow rate reducing valve 2 increases so as to compensate for this pressure. However, as the gas flow rate increases, the flow rate Q flowing through the flow rate control valve 8 increases, and the pressure loss ΔP increases in proportion to the square of the flow rate Q, so that the small flow rate reducing valve 2 on the outflow port 2b side. The pressure of will suddenly reach the set pressure. Then, after reaching this set pressure, the flow rate of the gas supplied from the small flow rate reducing valve 2 does not increase,
As shown by the curve 2 in FIG. 4, the pressure at the outlet portion 3 or the outflow port 1b of the large flow rate pressure reducing valve 1 is rapidly reduced. Then, this pressure immediately reaches the set pressure of the large flow rate reducing valve 1, and the gas starts to be supplied from the large flow rate reducing valve 1.

Therefore, the flow rate position where the pressure of the outflow port 2b of the small flow rate reducing valve 2 becomes the set pressure, that is, 100
Since the large flow rate reducing valve 1 is reliably operated at 1 / h, it is possible to reliably reduce the variation X1 in the flow rate position at the start / stop of the operation of the large flow rate reducing valve 1. Moreover, since the flow control valve 8 ensures that the pressure difference between the small flow reducing valve 2 side and the large flow reducing valve 1 side appears, these small flow reducing valve 2 and large flow reducing valve 1 resonate. There
It is also possible to prevent unstable pressure.

Further, since the flow rate control valve 8 is detachably provided in the flow path 7, the operation of the large flow rate reducing valve 1 is started by changing the flow rate control valve 8 having a different throttle diameter D.
There is an advantage that the stop flow rate position can be changed.

Although the flow rate control valve 8 is detachably attached to the flow passage 7 in the above embodiment, it may be fixedly provided by forming a part of the flow passage 7 to be thin. In this case, the cost can be reduced. Also,
The flow control valve 8 may be configured by a variable throttle whose throttle diameter D can be freely adjusted. In this case, it is possible to easily change the flow rate position for starting and stopping the operation of the large flow rate pressure reducing valve 1. Further, although the example in which the large flow meter 5 is provided is shown, the large flow meter 5 may be connected to the outlet section 3 as a device completely different from the parent-child pressure regulator.

[0028]

According to the invention of claim 1 configured as described above, the small flow rate reducing valve reaches the set pressure as the flow rate of the gas flowing in the flow rate control valve increases, and the pressure at the outlet portion rapidly increases. Therefore, the large flow rate reducing valve can be reliably operated at the flow rate position where the small flow rate reducing valve reaches the set pressure. Therefore, it is possible to reduce the variation in the flow rate position at the start / stop of the operation of the large flow rate reducing valve.

According to the second aspect of the invention, since the flow rate control valve is composed of a fixed throttle, the cost can be kept low. Further, according to the invention of claim 3, since the flow control valve is constituted by the variable throttle, the resistance of the flow control valve can be easily changed. Therefore, the flow rate position where the large flow rate pressure reducing valve operates can be easily set. Furthermore, in the invention of claim 4, for example, in the case of a fixed throttle, the resistance of the flow control valve can be changed by replacing the flow control valve, and the flow rate position at which the large flow pressure reducing valve starts operating. Can be changed freely. Further, even in the case of the variable diaphragm, there is an advantage that it can be changed to one having different characteristics.

[Brief description of drawings]

FIG. 1 is a sectional view of a parent-child pressure regulator shown as an embodiment of the present invention.

FIG. 2 is a gas circuit diagram of the same parent-child pressure regulator.

FIG. 3 is a conceptual diagram showing the principle of a flow control valve of the same parent-child pressure regulator.

FIG. 4 is a diagram showing pressure characteristics of the same parent-child pressure regulator.

FIG. 5 is a sectional view of a parent-child pressure regulator shown as a conventional example.

FIG. 6 is a gas circuit diagram of the same parent-child pressure regulator.

FIG. 7 is a diagram showing pressure characteristics of the same parent-child pressure regulator.

[Explanation of symbols]

 1 large flow pressure reducing valve 1b outflow port 2 small flow rate reducing valve 2b outflow port 3 outlet 6 small flow meter 6b outflow port 8 flow control valve

Claims (4)

[Claims] 1. A parent-child pressure regulator for reducing the pressure of a supplied gas in multiple stages and supplying it to another device from an outlet, wherein the pressure of the supplied gas is reduced to a prescribed pressure. A large flow pressure reducing valve to be supplied to the outlet, a small pressure reducing pressure set to a pressure higher than that of the large flow pressure reducing valve, and a small flow pressure reducing valve to supply the pressure-reduced gas to the outlet port side of the large flow pressure reducing valve,
A small flow meter provided between the outflow port of the small flow rate reducing valve and the outflow port side of the large flow rate reducing valve, and between the outflow port of the small flow rate meter and the outflow port side of the large flow rate reducing valve. A parent-child pressure regulator, which is provided with a flow control valve that regulates the flow of gas from the small flow meter side to the large flow pressure reducing valve side. 2. The parent-child pressure regulator according to claim 1, wherein the flow control valve is constituted by a fixed throttle. 3. The parent-child pressure regulator according to claim 1, wherein the flow control valve is constituted by a variable throttle. 4. The parent-child pressure regulator according to claim 1, 2 or 3, wherein the flow control valve is detachably provided.