JP2015197726A - Pressure governing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure governing device which is useful for general purposes and can obtain performance characteristics suitable for a flow rate region that is actually used.SOLUTION: The pressure governing device comprises: a valve stem 11 having a primary side path 2 and a secondary side path 3 communicating with each other via a valve aperture 4, including a diaphragm mechanism 5 for forming a diaphragm chamber communicating with a secondary side path 3, and provided continuous to the diaphragm mechanism 5, the valve stem 11 provided with a valve disc 12 provided continuously thereto, the valve disc 12 controlling the opening of the valve aperture 4; and a primary side balance chamber 14 communicating with the primary side path 2 and a secondary side balance chamber 15 communicating with the secondary side path 3, with a balance diaphragm 13 adjacent to the primary side balance chamber 14 provided continuously to the valve stem 11. In a communication path 16 by which the secondary side path 3 and the secondary side balance chamber 15 communicate, is provided a valve 17 for adjusting a flow rate amount, and the secondary balance chamber 15 and the diaphragm chamber 6 are made to communicate by a reducing hole 18.

Description

  The present invention includes a device main body having a primary side passage and a secondary side passage communicating with each other via a valve opening, and having a diaphragm mechanism that forms a diaphragm chamber communicating with the secondary side passage, A valve shaft that is connected to the diaphragm mechanism and is slidably held by the apparatus body; and a valve body that is connected to the valve shaft and controls the opening of the valve opening. The opening of the valve opening is controlled in accordance with the pressure fluctuation of the diaphragm chamber, and acts on the valve body from the primary side pressure and the secondary side passage. In order to cancel the differential pressure from the secondary side pressure, a primary side balance chamber communicating with the primary side passage and a secondary side balance chamber communicating with the secondary side passage are provided, and at least adjacent to the primary side balance chamber The balance diaphragm that It relates Sei圧 device being continuously to serial valve shaft.

Such a pressure regulator generally includes a primary side passage and a secondary side passage communicating with each other via a valve opening, a diaphragm mechanism forming a diaphragm chamber, a valve shaft connected to the diaphragm mechanism, and a valve shaft The valve body operates via the diaphragm mechanism and the valve shaft to control the opening of the valve opening as the pressure in the diaphragm chamber communicates with the secondary passage. By doing so, the pressure in the secondary side passage (secondary side pressure) can be regulated to a predetermined set pressure.
The characteristics of such a pressure regulating device are expressed by a characteristic line having a horizontal axis as a flow rate (Q) and a vertical axis as a secondary pressure (P2) as shown in the chart of FIG. The ideal pressure regulating characteristic of the pressure regulating device is that the secondary pressure (P2) in the secondary passage is regulated to a constant pressure regardless of the change in the flow rate (Q).

However, even in a pressure regulator equipped with a diaphragm mechanism, depending on the use conditions in which the pressure regulator is used, for example, the flow rate range and the pressure regulation range, as shown by the broken line “A” in the diagram of FIG. On the large flow rate side, the secondary side pressure (P2) may decrease excessively, and there is a problem that the pressure regulator cannot always be used in a state suitable for the on-site situation.
That is, as shown by the broken line “A” in the chart of FIG. 2, in the small flow rate region, the secondary pressure (P2) starts to rise after being slightly lowered, but in the large flow rate region, the secondary side pressure The pressure (P2) is extremely reduced, and one of the reasons for this state is that a so-called high pressure region close to the primary pressure is formed at the lower part of the valve body, resulting in insufficient opening of the valve opening. This is probably because of this.

  Therefore, in order to cancel the differential pressure between the primary side pressure and the secondary side pressure acting on the valve body, the primary side balance chamber (for example, refer to “14” in FIG. 1 of the present application) and the secondary communicating with the primary side passage. A balance diaphragm (see "13") is formed to form a secondary balance chamber (see "15") communicating with the side passage, and the balance diaphragm is adjacent to the primary balance chamber and the secondary balance chamber In this state, a pressure regulating device is proposed which is disposed between the primary passage and the diaphragm chamber and has a configuration in which the balance diaphragm is connected to the valve shaft (see, for example, Patent Document 1).

  According to this pressure regulator, even if a large amount of fluid from the primary passage flows into the lower portion of the valve body in the secondary passage and the pressure in the lower portion of the valve body increases, the high pressure fluid is balanced on the secondary side. Since the valve body is actuated in the opening direction by increasing the pressure in the chamber, the valve opening passes through the valve opening as the amount of fluid (Q) increases as indicated by the dashed line “B” in the chart of FIG. The amount of fluid flowing can be secured, and an extreme decrease in the secondary pressure (P2) can be prevented.

JP 2002-132352 A

  However, in the pressure regulating device described in the above-mentioned patent document, for example, the performance characteristics are fixed as indicated by the alternate long and short dash line of “B” in the chart of FIG. It would be difficult to obtain a pressure regulator with optimal performance characteristics.

  The present invention pays attention to such a conventional problem, and an object of the present invention is to provide a pressure regulator that has versatility and can obtain performance characteristics suitable for a flow rate range that is actually used. There is.

To achieve the above object, a pressure regulator according to the present invention has a primary side passage and a secondary side passage communicating with each other through a valve opening, and forms a diaphragm chamber communicating with the secondary side passage. A device body having a diaphragm mechanism therein, a valve shaft connected to the diaphragm mechanism and slidably held by the device body, and an opening degree of the valve opening portion connected to the valve shaft. A valve body that is configured to control the opening of the valve opening in accordance with pressure fluctuations in the diaphragm chamber, and that acts on the valve body from the primary passage. A primary balance chamber communicating with the primary passage and a secondary balance chamber communicating with the secondary passage in order to cancel the differential pressure between the side pressure and the secondary pressure acting from the secondary passage; Comprising at least the primary side balun Balance diaphragm adjacent chambers, a Sei圧 device which is continuously provided on the valve shaft,
The characteristic configuration is that a valve for adjusting a flow rate of a fluid flowing through the communication path is provided in a communication path communicating the secondary side path and the secondary side balance chamber, and the secondary side balance chamber and The diaphragm chamber is in communication with the diaphragm hole.

According to the above characteristic configuration, the valve for adjusting the flow rate is provided in the communication path that connects the secondary side passage and the secondary side balance chamber, and the secondary side balance chamber and the diaphragm chamber are communicated by the throttle hole. Therefore, the performance characteristics of the pressure regulator can be freely adjusted by adjusting the flow rate of the fluid that flows through the communication path using the valves and throttle holes provided in the communication path (specifically, it functions as a kind of throttle). It becomes possible to set to.
That is, referring to the chart of FIG. 2, for example, when the valve is fully closed or close to the fully closed state, it has a performance characteristic indicated by a broken line “A”. If the pressure regulating device has the performance characteristic indicated by the chain line, the performance characteristic is freely set between “A” and “B” by adjusting the valve, for example, as indicated by the solid line “C”. be able to.
Therefore, it has versatility that can cope with pressure regulation of various fluids with different flow rate ranges, and in actual implementation, set performance characteristics suitable for the flow rate range to be used to obtain the desired pressure regulation effect. Can do.

  The pressure regulating device according to the present invention is further characterized in that the valve body controls the opening of the valve opening from the secondary passage side, and the balance diaphragm includes the primary balance chamber and the secondary side. In a state adjacent to the side balance chamber, it is disposed between the primary side passage and the diaphragm chamber, and a communicating end portion of the communication passage to the secondary side passage opens below the valve body. There is in point.

According to the above characteristic configuration, the valve body controls the opening degree of the valve opening from the secondary side passage side, and the balance diaphragm is adjacent to the primary side balance chamber and the secondary side balance chamber. Therefore, the pressure regulating device itself can be simplified by rationally arranging the balance diaphragm, the primary balance chamber, the secondary balance chamber, and the like.
And since the communicating end part of the communicating path to the secondary side passage opens below the valve body, for example, the valve opens widely and the fluid from the primary side passage flows into the lower part of the valve body, When the pressure in the lower part of the body becomes high, the pressure in the secondary balance chamber is quickly increased to operate the valve body in the opening direction, and appropriate and quick opening control of the valve opening according to the situation Is possible.

  A further characteristic configuration of the pressure regulating device according to the present invention is that the communication path is formed by a tube member disposed outside the device body, and the valve is provided in the tube member.

  According to the above characteristic configuration, the valve for adjusting the flow rate of the fluid flowing through the communication path is located outside the apparatus main body, and the performance of the pressure regulator is easily and quickly from the outside of the apparatus main body. Characteristics can be set freely.

Longitudinal front view showing schematic configuration of pressure regulator Chart showing performance characteristics of pressure regulator Longitudinal front view showing a schematic configuration of a pressure regulating device according to another embodiment Chart showing performance characteristics of pressure regulating device according to another embodiment

An embodiment of a pressure regulator according to the present invention will be described with reference to the drawings.
The pressure regulator of the present invention is, for example, attached to a city gas conduit, and is used to depressurize high-pressure gas on the upstream side and supply it to the downstream side. As shown in FIG. A primary passage 2 connected to an upstream conduit (not shown) and a secondary passage 3 connected to a downstream conduit (not shown), the primary passage 2 and the secondary side The passages 3 communicate with each other via a circular valve port 4 as a valve opening.
The apparatus main body 1 is provided with a diaphragm mechanism 5 in a state of being positioned above the primary passage 2, and defining a lower chamber 6 as a diaphragm chamber positioned below and an upper chamber 7 positioned above. Yes.

A lower chamber 6 serving as a diaphragm chamber is communicated with the secondary passage 3 via a pipe line 8, and the upper chamber 7 is maintained at atmospheric pressure by an atmospheric opening 9. The upper chamber 7 includes a diaphragm mechanism 5. A compression spring 10 for pushing down the lower part is housed.
A valve shaft 11 is connected to the diaphragm mechanism 5, and the valve shaft 11 is slidable in the vertical direction along the axis of the diaphragm mechanism 5 so as to pass through the bottom wall 6 a of the lower chamber 6. The lower end of the valve shaft 11 is provided with a circular valve body 12 that controls the opening degree of the valve port 4 from below, in other words, from the secondary passage 3 side. As the pressure in the chamber 6 fluctuates, the opening degree of the valve port 4 is controlled by sliding up and down through the diaphragm mechanism 5 and the valve shaft 11.

Below the bottom wall 6a of the lower chamber 6, a bellows 13 as a balance diaphragm is disposed, and a primary balance chamber 14 positioned below and a secondary balance chamber 15 positioned above are defined. . That is, the belofram 13 is provided in a state adjacent to the primary balance chamber 14 and the secondary balance chamber 15, the primary balance chamber 14 communicates with the primary passage 2, and the secondary balance chamber 15 communicates with the secondary balance chamber 15. The secondary side passage 3 communicates with a bypass pipe 16 as a passage.
A bellows 13 as a balance diaphragm is connected to the valve shaft 11 and has a differential pressure between a primary side pressure acting on the valve body 12 from the primary side passage 2 and a secondary side pressure acting on the secondary side passage 3. Configured to cancel.

The bypass pipe 16 as a communication path that communicates the secondary side passage 3 and the secondary side balance chamber 15 is various pipe members disposed outside the apparatus body 1, for example, a metal pipe member, or The bypass pipe 16 is formed of a flexible synthetic resin pipe member or the like, and is arranged so that the communicating end of the bypass pipe 16 to the secondary passage 3 opens below the center of the valve body 12.
In the pipe member that forms the bypass pipe 16, a valve 17 that adjusts the flow rate of the gas flowing through the bypass pipe 16 is provided at a portion disposed outside the apparatus main body 1, and the secondary-side balance chamber 15. A bleed hole 18 as a throttle hole for communicating the secondary balance chamber 15 and the lower chamber 6 is provided in the bottom wall 6a that partitions the lower chamber 6 as a diaphragm chamber.

Next, the operation and performance characteristics of the pressure regulator will be described.
For example, when the secondary pressure in the secondary passage 3 decreases in the closed state where the valve body 12 closes the valve port 4, the pressure in the lower chamber 6 also decreases, and the valve shaft 11 slides downward, The valve body 12 is also moved downward and opened, and the gas in the primary side passage 2 flows into the secondary side passage 3 through the valve port 4.
When the valve body 12 moves further downward and the valve opens greatly, a large amount of gas flows into the lower part of the valve body 12 in the secondary passage 3 and when the pressure in the lower part of the valve body 12 increases, The pressure in the secondary balance chamber 15 is increased via the bypass pipe 16 to act to move the valve body 12 downward (in the opening direction).
As a result, as indicated by “B” in the chart of FIG. 2, even if the amount of gas (Q) increases, the secondary pressure (P2) does not decrease extremely, but conversely increases. Performance characteristics.

In the pressure regulator of the present invention, the valve 17 is provided in the bypass pipe 16, and the flow rate of the gas flowing through the bypass pipe 16 can be adjusted by the valve 17. The characteristics can be freely set and changed.
That is, when the valve 17 is fully closed, the result is the same as that of the configuration in which the bypass pipe 16 is not provided, and the performance characteristic indicated by the broken line “A” in the chart of FIG. 2 is obtained. When the valve 17 is fully opened, the performance characteristic indicated by the alternate long and short dash line of “B” is obtained. When the valve 17 is set between the fully closed and full opening, the performance characteristic between “A” and “B”, for example, “C” The performance characteristic indicated by the solid line “” can be set to the optimum performance characteristic for the actual flow rate range.

[Another embodiment]
(1) Although another embodiment will be described with reference to FIG. 3, the components described in the previous embodiment or the components having the same action are denoted by the same reference numerals, and the description thereof will be omitted. A configuration different from the form will be described.
In the previous embodiment, an example in which the secondary balance chamber 15 is provided adjacent to the upper side of the bellows 13 as a balance diaphragm has been shown. However, as shown in FIG. When the chamber 15 is provided and the downstream side of the secondary passage 3, that is, when the valve is greatly opened and the flow velocity in the outlet pipe is increased, the pressure is reduced by the venturi effect (the part indicated by “4 a” in FIG. 3). ) And the secondary side balance chamber 15 can be communicated with each other by a bypass pipe 16 as a communication path made of various pipe members, and a valve 17 can be provided in the bypass pipe 16.
In that case, a cylindrical body 12a is provided below the valve body 12, and the cylindrical body 12a is configured to slide relative to the secondary balance chamber 15. The upper side of the bellowram 13 is a lower chamber 6 serving as a diaphragm chamber. As part of Then, the secondary balance chamber 15 and the lower chamber 6 are communicated with each other through a pipe 19, and a bleed hole 18 as a throttle hole is provided in the pipe 19.

According to the pressure regulating device of this other embodiment, when the valve 17 is closed to near full close, the performance characteristic indicated by the broken line “A” in the chart of FIG. 4 is obtained, and when the valve 17 is fully opened, “B”. It becomes a performance characteristic shown with a dashed-dotted line.
Then, by setting the valve 17 between fully closed and fully open, the performance characteristic between “A” and “B”, for example, the performance characteristic indicated by the solid line of “C”, is the same as in the previous embodiment. Similarly, it is possible to set performance characteristics that are optimal for the actual flow rate range.

(2) In the above embodiments, the example in which the bypass pipe 16 as the communication path is formed by the pipe member disposed outside the apparatus main body 1 is shown. It can also be implemented.
For example, in the embodiment shown in FIG. 1, a communication passage 16 extending along the valve shaft 11 is formed at the center of the valve shaft 11, and an upper opening end of the communication passage 16 communicates with the secondary side balance chamber 15. The lower opening end may be configured to communicate with the secondary side passage 3 through an opening provided in the valve body 12, and in that case, the valve 17 is also provided in the apparatus main body 1.

(3) In the embodiments described so far, the pressure regulator attached to the city gas conduit has been exemplified. However, the pressure regulator of the present invention is not particularly limited to city gas, and other than city gas. It can be applied to various gases, and also to various liquids including clean water.

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Primary side channel | path 3 Secondary side channel | path 4 Valve opening part 5 Diaphragm mechanism 6 Diaphragm chamber 11 Valve shaft 12 Valve body 13 Balance diaphragm 14 Primary side balance chamber 15 Secondary side balance chamber 16 Communication path 17 Valve 18 Restriction hole

Claims (3)

A device main body having a primary side passage and a secondary side passage communicating with each other through the valve opening, and having a diaphragm mechanism forming a diaphragm chamber communicating with the secondary side passage, and communicating with the diaphragm mechanism A valve shaft that is slidably held by the device main body, and a valve body that is connected to the valve shaft and controls the opening of the valve opening, the valve body including the diaphragm chamber. The primary side pressure acting on the valve body from the primary side passage and the secondary side pressure acting from the secondary side passage are configured to control the opening of the valve opening in accordance with pressure fluctuations In order to cancel the differential pressure between the primary side passage and the primary side balance chamber, the secondary side balance chamber communicated with the secondary side passage, and at least a balance diaphragm adjacent to the primary side balance chamber The valve stem A Sei圧 device is set,
A valve that adjusts the flow rate of the fluid flowing through the communication passage is provided in the communication passage that connects the secondary passage and the secondary balance chamber, and the secondary balance chamber and the diaphragm chamber are connected to each other. A pressure regulator connected by a throttle hole.   In the state where the valve body controls the opening degree of the valve opening from the secondary passage side, and the balance diaphragm is adjacent to the primary balance chamber and the secondary balance chamber, the primary passage The pressure regulating device according to claim 1, wherein the pressure regulating device is disposed between the first and second diaphragm chambers, and a communicating end portion of the communicating passage to the secondary passage opens below the valve body.   The pressure regulating apparatus according to claim 1 or 2, wherein the communication path is formed by a pipe member disposed outside the apparatus main body, and the valve is provided in the pipe member.

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