JP2002139163A - Pressure regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rationalize part constitution and reduce a cost without lowering performance of a pressure regulator. SOLUTION: An inversion spring 36 is provided to airtightly partition a primary pressure working chamber 19 to introduce a part of injected gas and a secondary pressure working chamber 18 to introduce pressure-regulated gas from a gas flow passage 27. When a relation between a primary pressure and a secondary pressure is normal, a state inverted to the primary pressure working chamber side is kept. A shut-of part 40 to shout off a gas flow inverted to the secondary working chamber side owing to an abnormal increase in a gas pressure is provided between the inversion spring 36 and the secondary working chamber side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection portion incorporating a check valve for closing a connection port when a small gas container is not connected and pushing a nozzle valve to eject a gas when the small gas container is connected; The present invention relates to a pressure regulator having a pressure regulator for regulating pressure and a gas flow path for supplying a pressure-regulated gas downstream.

[0002]

2. Description of the Related Art In a gas appliance using a small gas container,
A pressure regulator is used which regulates the pressure of the gas ejected from the small gas container and supplies it to an operating section such as a burner. Such a pressure regulator is also called a governor or a decompressor. In many cases, an instrument plug for supplying a pressure-adjusted gas flow or adjusting a flow rate is incorporated.
It has a configuration as shown in the figure. The conventional device stopper maintains airtightness by sliding the tapered surfaces, and does not cause gas leakage from the sliding surfaces. But,
Therefore, high processing accuracy is required for the tapered surface shape, surface roughness, and the like, and this has been a cause of high cost.

[0003] Also, in the case where a pressure sensing safety device is installed in order to prevent an accident such as a rupture of a small gas container due to an abnormal rise in pressure, the device is often incorporated into a pressure regulator. This is the case with 29390. The method of resetting after the safety device is activated is not limited to the same item, but the resetting is automatically performed by manually operating a member provided exclusively for resetting or by closing the instrument tap knob. Two approaches have been taken. In the case of the above-mentioned invention, although it has a reset-dedicated member separate from the instrument stopper, a method of automatically resetting also requires a complicated structure, which increases the price of the pressure regulator. .

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to reduce the cost by rationalizing the components of the pressure regulator without lowering the performance. is there. Another object of the present invention is to provide a pressure regulator that exhibits desired performance without requiring high processing accuracy such as rubbing of tapered surfaces. It is another object of the present invention to provide a pressure regulator with a built-in safety device that can be reset with a simple configuration that allows the instrument plug to act directly on the safety device.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a primary pressure chamber for introducing a part of the ejected gas and a secondary pressure chamber for introducing a pressure-adjusted gas from a gas passage. A reversing spring is provided to partition the chamber from the primary pressure chamber when the primary pressure and the secondary pressure are normal. A means is provided in which a reversing spring is provided with a blocking portion for reversing to the side and blocking the gas flow. Further, the gas flow rate can be adjusted by an instrument plug provided so as to be able to move forward and backward in the direction crossing the gas flow path, and the reversing spring inverted to the secondary pressure action chamber can be forcibly returned to the primary pressure action chamber. You can take steps to do that. Note that forced return may be considered to be the same as reset.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A pressure regulator according to the present invention is mounted on a gas appliance using a small gas container.
This pressure regulator has a configuration in which a connection port is closed to stop backflow of gas inside when a small gas container is not connected, and a check valve that pushes a nozzle valve to eject gas when connected is installed. The connection portion includes a space incorporating the check valve and a connection port for connecting the small gas container.

[0007] The pressure regulator also has a pressure regulator for adjusting the pressure (hereinafter referred to as primary pressure) of the gas ejected by connecting the small gas container. Therefore, the pressure adjusting section includes an element which varies according to the pressure of the gas and keeps the pressure constant, which is composed of a vibrating membrane such as a diaphragm or a movable member such as a piston. The pressure regulator further has a gas flow path for supplying a gas having a regulated pressure (hereinafter referred to as a secondary pressure) downstream. The gas flow path can take various forms such as holes, spaces, and tubes.

[0008] A part of the gas ejected by the connection of the small gas container is introduced into the primary pressure action chamber from the connection space, and the remaining gas flows into the pressure adjusting section, where the pressure is adjusted, and then the gas flows through the gas passage. Through the secondary pressure action chamber. The primary pressure action chamber and the secondary pressure action chamber are airtightly separated by a reversing spring. Therefore, both the primary pressure and the secondary pressure act on the reversing spring.

The reversing spring can be reversed by receiving either the primary pressure or the secondary pressure, whichever is greater. However, when the relationship between the primary pressure and the secondary pressure is normal, the reversing spring is reversed toward the primary pressure working chamber. The state is maintained, and the state can be reversed to the secondary pressure action chamber due to the abnormal rise of the primary pressure. Also, due to abnormal rise of the primary pressure, 2
When the reversing spring is reversed to the side of the next pressure action chamber, a blocking portion for blocking a gas flow is provided. Therefore, the blocking part can be regarded as a means for urgently opening and closing the gas flow path separately from the instrument plug. Therefore, the pressure sensing part and the blocking part by the reversing spring constitute a pressure sensing safety means.

Further, the gas flow rate can be adjusted by an instrument plug provided in the gas flow passage portion so as to be able to move forward and backward.
Further, the reversing spring inverted to the secondary pressure action chamber side can be forcibly returned to the primary pressure action chamber side. That is, it is desirable that the instrument stopper be capable of adjusting the gas flow rate by moving in the direction crossing the flow path, and also capable of performing the operation of forcibly returning the reversing spring. This is because when the gas flow rate is adjusted by the linear movement of the instrument plug, the reversing spring can be forcibly returned by moving the instrument plug forward.

The instrument plug may have a tapered shape, that is, a frusto-conical shape, and therefore the gas passage may have the same shape. However, both portions maintain airtightness by sliding the tapered surfaces together. It is desirable to provide sealing means at important points in order to make the structure unnecessary. As the sealing means, for example, in the sliding portion such as an O-ring,
It is desirable that airtightness can be maintained irrespective of receding, and when used for a surface having a tapered shape, airtightness can be exhibited before and after contact with the tapered surface.

The reversing spring has both a spring elasticity for reliably performing the reversing and returning operations and a sealing function for hermetically separating the primary pressure acting chamber and the secondary pressure acting chamber. And Further, when forcibly returning the reversing spring that has been reversed to the side of the secondary pressure action chamber, it is desirable that the related components be formed of metal in order to realize reliable reversal with a shorter stroke.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the illustrated embodiments. FIG. 1 shows an appearance of a pressure regulator 10 according to the present invention, and FIG. 2 shows a longitudinal section thereof. The connection section 12 is connected to the main body 11
And a check valve 15 and a check valve spring 16 incorporated in the space 14 therein so as to be able to move back and forth in the connection direction. The check valve 15 has a sealing member 17 that closes the connection port 13 when the small gas container is not connected, and the check valve spring 16 has a spring strength to push the nozzle valve N of the small gas container to open it. ing.

The connecting portion 12 communicates with the primary pressure action chamber 19 through the inner hole 18 and at the same time, the pressure adjusting portion 2
Leads to zero. For this reason, the connection part 12 may be said to be a part that separates the gas ejected from the small gas container by the connection into the pressure sensing part and the pressure adjustment part 20.

The pressure adjusting section 20 includes a pressure adjusting chamber 22 and 1
A movable member 23 shown by a diaphragm and an adjusting member 24 shown by a spring, which fluctuates according to the pressure of the gas flowing into the same chamber from the next pressure flow path 21 and acts to keep the pressure constant; It has a switch 25 that is moved by the gas pressure and the movement of the movable member 23, and the switch 25 opens and closes an opening 26 of the primary pressure channel 21. The illustrated opening / closing element 25 is a known lever type, but is not limited thereto.

A secondary pressure flow path 27 through which the gas whose pressure has been adjusted flows is extended downstream of the pressure adjusting section 20. The secondary pressure flow path 27 has a location for introducing gas into the secondary pressure action chamber 28, which has a tapered wall surface and is also used as a valve chamber 29 for disposing the instrument plug 30. The instrument tap 30
The valve body 29 includes a plug body 31 which is inserted into the valve chamber 29 so as to be able to move forward and backward, and an operation shaft 32 having an end which is externally operated to protrude and retract the plug body 31 and arranged. Both parts 3
1, 32 may be made of separate members or may be made of a single member. Between the valve chamber 29 in which the plug 31 is incorporated and the shaft hole 33 in which the operating shaft 32 is installed, the instrument stopper 30 is maintained in an airtight state by sealing means 34 and 35, respectively.

The distal end of the instrument plug 30 can project into the secondary pressure action chamber 28 described above. The instrument tap 30 is connected to the primary pressure action chamber 19.
The secondary pressure action chamber 28 is air-tightly partitioned by a reversing spring 36, and abuts against a part of the reversing spring 36 that is reversed to the secondary pressure action chamber side, and is brought into contact with the primary pressure action chamber. Used to force return in the direction. The reversing spring 36 has spring elasticity commonly called a disc spring or the like. Metal spring plate 37
And, for example, rubber having soft elasticity integrated therewith. A projection 39 is provided on the side of the secondary pressure action chamber 28 of the elastic member 38, and when the reversing spring 36 is inverted, the projection 39 is provided.
Can contact the receiving seat 41 provided in the secondary pressure action chamber 28. The projecting portion 39 and the receiving seat portion 41 constitute a blocking portion 40.

Further, on the side of the secondary pressure action chamber of the reversing spring 36, there is provided a pressing portion 42 for applying an operating force for forcible return by the instrument plug 30. The pressing portion 42 in the example of FIG. 2 is illustrated as a metal plate, and the pressing portion 42 in the example of FIG. 3 is illustrated as a metal ball. 36.

In order to correctly advance and retreat the instrument plug 30, the movement of the operating shaft 32 is controlled by a screwing mechanism. The screwing mechanism is composed of a male screw part 43 provided on a part of the operation shaft part 32 and a screw part 44 provided on the main body 11 side. The instrument plug 30 is constantly urged in the forward direction by the spring means 45. In the drawing, reference numeral 46 denotes a flow path of gas flowing out from the secondary pressure action chamber 28,
Is the gas pipe downstream of it, both of which are in the secondary pressure passage 2
It can be considered a part of 7.

As shown in FIG. 3, when the nozzle valve N of the small gas container is connected to the connection port 13, it is pushed in by the check valve 15 to open the valve, the gas is ejected into the space, and a part of the gas is discharged to the primary pressure. The remainder in the working chamber 19 flows into the primary pressure channel 21 and the pressure adjusting section 2
After the pressure is adjusted at 0,
It flows into the next pressure action chamber 28. Normal time primary pressure action chambers 19 and 2
The pressure is balanced with the secondary pressure chamber 28, so that the reversing spring 36 is reversed to the primary pressure chamber side and remains in a normal state. The lower half of FIG. 3 shows this normal use state.

In the normal use state, even in the closed position where the instrument plug 30 is advanced most, it does not come into contact with the reversing spring 36. And the fire of the operating portion, for example, the burner portion is increased. On the other hand, if the operation is performed in reverse, the fire becomes low, and in the state where the fire cannot be advanced any more or shortly, the gas passage is hermetically sealed by the sealing means 34 and the fire is extinguished. The gas flow during this period is as shown by the arrows in FIG.

When the internal pressure rises abnormally due to heating of the small gas container, the abnormal high pressure becomes 1
It flows into the next pressure action chamber 19, and as a result, the reversing spring 36 is inverted to the secondary pressure action chamber side. It is a state of the upper half of FIG. When the reversing spring 36 is reversed to the secondary pressure action chamber side, the projection 39 comes into contact with the receiving seat 41 and the gas flow is shut off. Operation stops. Here, if the small gas container is removed, the primary side has a lower pressure than the secondary side where the abnormally high pressure remains, so that the reversing spring 36 can be forcibly returned by advancing the instrument plug 30. The gas appliance can be used normally by exchanging the gas container which is not abnormally heated.

However, if a small gas container having an internal pressure that is abnormally elevated is kept connected, the pressure in the primary pressure action chamber 19 is higher than the pressure in the secondary pressure action chamber 28. Even if the reversing spring 36 is pushed by pushing the reversing spring 30, the reversing spring 36 is pushed back to the side of the secondary pressure action chamber and cannot be forcibly returned. Therefore, the danger is prevented by the pressure sensing safety device, so that the small gas container does not rupture.

As described above, the pressure regulator of the present invention having such a configuration exhibits a function as a safety device equivalent to a pressure regulator having a complicated configuration. Further, structurally, the primary pressure action chamber 19 and the connection space 14
The main body 11 can be formed by the block A having the pressure adjusting section 20, the block B having the secondary pressure action chamber 28, the instrument plug attaching section, and the connection port member C. The incorporation of the spring 36 has significantly simplified the construction of the pressure sensing device. In addition, instrument stopper 3
Regarding 0, the adjustment of the gas flow rate and the prevention of gas leakage are attained, which are equivalent to those obtained by rubbing although the rubbing of the tapered surface is not necessary.

[0025]

Since the present invention is constructed and operates as described above, it is possible to achieve the rationalization of the pressure regulator without lowering the performance and to reduce the price, and also to achieve the airtightness by sliding. There is an effect that the intended purpose can be achieved without requiring high processing accuracy such as holding.

[Brief description of the drawings]

FIG. 1A is a front view of a pressure regulator according to an embodiment of the present invention. (B) The same side view.

FIG. 2 is a longitudinal sectional view of the above.

FIG. 3 is a sectional view of a main part of another embodiment in which an upper half is in an abnormal state and a lower half is in a normal state.

FIG. 4 is a front view and a partially cutaway side view of the instrument stopper.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Kenji Suzuki 2-6-8, Moiwadai, Taishiro-ku, Sendai-shi, Miyagi F-term in San Frontier Technological Co., Ltd. F-term (reference) 3H056 AA07 BB32 BB33 CA07 CA08 CA09 CB02 CB07 CD03 CD06 DD04 EE06 GG03 3H059 AA03 AA09 AA14 BB22 BB30 CA13 CD06 DD14 FF05

Claims (3)

[Claims] When the small gas container is not connected, the connection port is closed, and when the small gas container is connected, a connection portion incorporating a check valve for pushing a nozzle valve to eject gas, and a pressure for adjusting the pressure of the ejected gas are provided. A pressure regulator having an adjustment section and a gas flow path for supplying a pressure-adjusted gas downstream, comprising: a primary pressure action chamber for introducing a part of the ejected gas; A reversing spring is provided for airtightly separating the secondary pressure working chamber introduced from the flow passage from the primary pressure working chamber when the relationship between the primary pressure and the secondary pressure is normal. A pressure regulator provided between the reversing spring and the side of the secondary pressure working chamber, the blocking part being turned to the side of the secondary pressure working chamber due to abnormal rise of the gas and blocking the gas flow. 2. A connection portion which incorporates a check valve for closing the connection port when the small gas container is not connected and pushing the nozzle valve to eject the gas when connected, and a pressure for adjusting the pressure of the ejected gas. A pressure regulator having an adjustment section and a gas flow path for supplying a pressure-adjusted gas downstream, comprising: a primary pressure action chamber for introducing a part of the ejected gas; A reversing spring is provided for airtightly separating the secondary pressure working chamber introduced from the flow passage from the primary pressure working chamber when the relationship between the primary pressure and the secondary pressure is normal. A shut-off portion is provided between the reversing spring and the secondary pressure action chamber side to shut off the gas flow by reversing to the secondary pressure action chamber side due to abnormal rise of the gas. Reversal with adjustable flow rate and reversal to the secondary pressure chamber A pressure regulator characterized in that a spring can be forcibly returned to the primary pressure action chamber side and a reversing spring is forcibly returned by operating an instrument plug used for adjusting a gas flow rate. 3. The device plug has sealing means for maintaining airtightness with a wall surrounding the device plug, and some of them have airtightness when they come into contact with the tapered surface. 3. The pressure regulator according to claim 2, wherein