JP2751996B2 - Self-diagnosis type pressure regulator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulator connected to a gas cylinder or the like and capable of detecting abnormal pressure and automatically stopping supply of a pressure fluid.

[Conventional technology]

In order to supply propane gas to household gas appliances, it is necessary to connect a pressure reducing valve between the propane gas cylinder and the household piping.However, conventionally, a propane gas supplier checks the security characteristics of the pressure reducing valve over time. It was implemented once every two years.

That is, the security inspection tool 36 is located in the middle of the gas pipe 35 shown in FIG.
And check the three characteristics of supply pressure, valve closing pressure, and safety valve blowing pressure.

In the figure, 34 is a gas cylinder, A 'is a pressure reducing valve, B' is a gas meter, 37 is a cock, and 38 is a gas appliance.

Here, the supply pressure refers to the high-pressure gas (MA
X15.6 kg / cm ² ) means the pressure at which the pressure is reduced by the pressure reducing valve A ′ and sent to the gas appliance 38, based on 230 to 330 mmH ₂ O.

The closing pressure refers to a pressure set when the valve body 2 of the pressure reducing valve shown in FIG. 4 is closed by the action of the diaphragm 5, and is 350 mmH ₂ O.
Based on the following:

The safety valve balloon pressure, abnormally high (560~840mmH ₂
This is the pressure at which the safety valve 39 opens when pressure (based on O) flows into the pressure reducing valve A '.

Here, the structure of the pressure reducing valve A 'will be described. A valve body 2 for opening and closing a gas inlet (valve seat) 1 is provided, and the distal end of the operating rod 7 is connected to the valve body 2 via a link mechanism 3 by a pressure reducing valve. It is formed by connecting to a boss 6 of a diaphragm 5 provided on the upper part of the main body.

That is, the boss portion 6 includes an operating rod pressing portion 39 ′ for opening the valve body and an operating rod holding portion 40 for closing the valve, which are integrated with the safety valve.
During normal operation, the operating rod 7 and the operating rod holding portion 40 are in contact with each other.

When an abnormally high pressure is applied to the diaphragm 5, the diaphragm 5 rises against the force of the adjusting spring 41 and the check spring 42, and opens the safety valve 39.

The diaphragm 5 receives the urging force of the pressure adjusting spring 41 via the reinforcing plate 43, and the strength of the adjusting spring 41 is adjusted so that the urging force and the gas pressure in the valve chamber 4 are balanced to obtain the closing pressure. Is set.

Problems such as abnormalities in the security characteristics include breakage or settling of the pressure adjusting spring 41, supply pressure abnormalities due to the connection between the pressure reducing valve A 'and the domestic piping or leakage from the piping,
An obstruction pressure abnormality occurs when dust or the like is bitten between the valve and the valve seat 1 or the operating rod 7 is locked halfway.

These abnormalities lead to major accidents such as gas leaks and gas explosions. To prevent such abnormalities, the conventional inspection frequency is not sufficient, and it has been desired to increase the inspection frequency.

[Problems to be Solved by the Invention] In view of the above points, the present invention can constantly monitor the presence or absence of a pressure abnormality, and in the event of an abnormality, perform measures such as warnings and valve shutoff to prevent accidents such as gas leakage. It is an object of the present invention to provide a self-diagnosis type pressure regulator which can be prevented from occurring.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a valve body that opens and closes a gas inlet, an operating rod that drives the valve body via a link mechanism, and a valve chamber that is connected to the operating rod to define a valve chamber. A pressure regulating diaphragm, a flexible pressure detecting member located in the chamber following the valve chamber, a switch that is activated by displacement of the pressure detecting portion, and a gas flow that is driven by the operation of the switch, In a pressure regulator comprising an electromagnetic valve for closing an inlet or a gas outlet, the switch is provided with an electric contact provided on the pressure detecting member and a stepwise displacement with respect to the electric contact. A contact for detecting a supply pressure, a contact for detecting a valve closing pressure, and a contact for detecting a safety valve blowout pressure, which are arranged as a contact, and the contact for detecting a safety valve blowout pressure is connected to the electromagnetic valve via a logic circuit; Supply pressure detection contact and valve closing pressure detection contact : It is connected to a flow transmitter gas meter via a logical circuit, the contact for each detection is characterized in that it is connected to each pressure abnormality warning lamp (Claim 1).

It is also effective that the switch includes a contact for detecting a safety pressure for use of a gas appliance, and the contact for detection of a safety pressure for use of a gas appliance is connected to the solenoid valve via the logic circuit (claim (2)). It is also effective that the solenoid valve can press the operating rod in a valve closing direction (claim (3)).

Further, each detection contact and the solenoid valve in claim (1) are connected to a controller instead of the logic circuit and the flow rate transmission type gas meter, and the controller is provided with a solenoid valve manual operation unit, It is also effective that the valve can close the gas outlet (claim (4)).

(Operation)

In the configuration of claim (1), when the pressure in the valve chamber rises abnormally and reaches the safety valve blowing pressure (840 mmH ₂ O),
The safety valve outlet pressure detection contact turns on, the solenoid valve operates, and the gas inlet or gas outlet is shut off. Each pressure abnormality warning lamp flashes at the same time as the shutoff. In addition, when the flow rate of the flow meter is not zero, the ON / OFF state of the supply pressure detection contact is monitored by the logic circuit. When the gas supply pressure (230 mmH ₂ O) decreases, the supply pressure detection contact Turns on and the abnormality warning lamp lights. When the flow rate of the gas meter of the flow transmission type is zero, the on / off state of the contact for detecting valve closing pressure is monitored by a logic circuit, and when the pressure in the valve chamber exceeds the valve closing pressure (350 mmH ₂ O),
The contact for valve closing pressure detection turns on, and the abnormality warning lamp lights up.

In the configuration of claim (2), when the pressure in the valve chamber becomes equal to or lower than the gas appliance use safety pressure (140 mmH ₂ O), the safety pressure detection contact is turned on, the solenoid valve is operated, and the gas inflow port or the gas inflow port is operated. The outlet is shut off.

In the configuration of claim (3), the operation rod is pressed by the operation of the electromagnetic valve, and the valve body at the gas inlet is closed.

In the configuration of claim (4), the gas outlet is shut off by manual operation of the solenoid valve, and in this state, the on / off state for detecting the valve closing pressure is monitored.

〔Example〕

Figure 1 (a) is a sectional view showing a pressure reducing valve A ₁ for propane gas, which is an embodiment of a self-type pressure regulator of the present invention, the inlet of the propane gas (valve seat) 1-off The pressure reducing valve is provided with a valve body 2 which is connected to the valve body 2 and a middle part of an operating rod 7 is connected to a boss 6 of a pressure adjusting diaphragm 5 via a link mechanism 3. A pressure detecting diaphragm (pressure detecting member) 13 is provided in 45, and an electric contact 10 is protruded from the center of the diaphragm 13 on the side opposite to the pressure chamber 4.

A plurality of (four in the figure) electrical contacts 11 are radially arranged at intervals in the axial direction to face the contact 10 to form a switch portion S.

Said contact 11 is fixed to the tip of the pressure reducing valve projecting wall portion 14 the metal plate springs 12 provided on the body A _1, the leaf spring 12 adjusting screw 15 that screwed to the projecting wall portion 14 'of the lower The middle part is supported.

That is, the pressure in the valve chamber 4 is equal to the gas appliance use safety pressure (140 to 1).
90mmH ₂ O), the gas supply pressure (MIN230mmH ₂ O), the valve closure pressure (35
0 mmH ₂ O) and a gap corresponding to the axial displacement of the pressure detecting diaphragm 13 when the safety valve blowing pressure (MAX840 mmH ₂ O) is reached are set by the adjusting screw 15.

In FIG. 1 (c), reference numeral 16 denotes a safety pressure detecting contact, 17 denotes a supply pressure detecting contact, 18 denotes a valve closing pressure contact, and 19 denotes a safety valve blowing pressure contact. In this order, the distance from the contact 10 is It is set large.

Then, the contact 10 and the contacts 16 to 19 in the wire 29, is connected to the logic circuit 8 incorporated in the pressure reducing valve A _1.

Further, with respect to the pressure reducing valve A _1, the solenoid valve 30 is provided, the plunger 20 'of the solenoid valve 30, there is provided a driving stem 20 for closing the valve body 2 by pushing the operating rod 7 The safety pressure detecting contact 16 and the safety valve blowing pressure contact 19 are electrically connected to the solenoid valve 30 via the logic circuit 8.

Further, as shown in Fig. 1 (b), the side surface of the pressure reducing valve body Yes and disposed a pressure abnormality warning lamp L ₁ ~L ₄ to the detection pressure of the respective, similarly the warning lamp Connected to each contact.

Furthermore, the pressure reduction valve A ₁ and the flow outgoing gas meter B and logical circuit 8 disposed between the domestic gas appliance (not shown) are electrically connected.

In the figure, reference numeral 21 denotes a lamp reset button used for replacing a cylinder and the like, and 9 in FIG. 1A denotes a battery.

Now describing the action event in the gas appliance used, pressure reducing valves A ₁ and when the pressure in the pipe way from causing leakage gas valve chamber 4 is lowered, always contact the security pressure detecting-like contacts 16 As the pressure detecting diaphragm 13 rises, it is separated from the contact 10 and turned on, and the solenoid valve 30 is operated to close the gas inlet 1 with the valve body 2.

Further, when the used gas flow rate sent from the flow rate transmitting gas meter B is not zero, the supply pressure monitoring sequence of the logic circuit 8 operates to monitor the input signal from the supply pressure detecting contact 17 and to use the supplied gas flow rate. Is zero, the input signal of the valve closing pressure contact 18 is monitored.

Here, the supply pressure detection contact point 17 always contact type is the supply圧異normal lamp L ₂ becomes into the ON state by the pressure drop lights.

Similarly, when the valve closing contact 18 comes into contact with the contact 10 due to a rise in pressure and is turned on, the valve closing pressure abnormality lamp
L ₃ lights up.

When the pressure in the valve chamber 4 further increases and the safety valve blow-out pressure contact 19 is turned on, the safety valve operating pressure monitoring lamp L ₄
Blinks and the solenoid valve 30 is operated to push the operating rod 7 to bring the valve body 2 into close contact with the inflow port (valve seat) 1, so that the gas supply is stopped.

At this time, each lamp remains lit unless the reset button 21 is pressed.

It is also possible to operate the electromagnetic valve 30 by turning on the supply pressure detecting contact 17 or the valve closing contact 18 by setting the logic circuit 8.

Figure 2 is illustrates another embodiment of the present invention, is provided with a pressure detection Berofuramu (pressure detection member) 22 in the pressure reducing valve A ₂ empty chamber 46 following the valve chamber 4, the Bellow Flam
A stem 24 having a protruding contact 25 at the tip at the center of 22
And a bellows ram 22 via a return spring 23.
Are supported so as to be axially displaceable.

Further, the contact 2 for supply pressure detection is opposed to the contact 25.
6. The contact 27 for valve closing pressure and the contact 28 for safety valve blowing pressure are provided at appropriate intervals in the displacement direction of the contact 25, respectively.

It said contact 26-28 connected to the controller C by the wire 29 ', the said controller C supplies圧異normal lamp L _2,
The valve closure abnormality lamp L ₃ and the safety valve operation pressure monitor lamp L _4,
Are arranged respectively.

Further, an electromagnetic valve 30 ′ is provided at a gas outlet 44 in the valve chamber 4, and the outlet valve closing valve body is connected to the solenoid valve 30 ′ via a stem 31.
32 are provided.

The solenoid valve 30 'is electrically connected to the controller C.
Remote control is possible, and when confirming the valve closing pressure, the outlet closing valve body 32 is closed.

Incidentally, the controller C and warning unit (abnormality lamp L ₂ ~
L ₄ ) is electrically connected, and at the same time as the pressure is abnormal, a signal is sent from the controller C to the solenoid valve 30 ′ so that the outlet closing valve body 32 is closed.
Can of course be closed.

〔The invention's effect〕

As described above, according to the invention described in claim (1), the pressure in the valve chamber is abnormally increased, and the safety valve blowing pressure (840 mmH
_{When the} pressure reaches ₂ O), the safety valve outlet pressure detection contact turns on and the solenoid valve operates to shut off the gas inlet or gas outlet. When it is not zero, the on / off state of the supply pressure detection contact is monitored by the logic circuit, and the gas supply pressure (230mmH
₂ O) When the pressure drops, the supply pressure detection contact turns on, the abnormality warning lamp lights, and when the flow rate of the flow transmission type gas meter is zero, the logic circuit detects the valve closing pressure detection contact. The ON / OFF state is monitored, and when the pressure in the valve chamber exceeds the valve closing pressure (350 mmH ₂ O), the valve closing pressure detection contact turns on and the abnormality warning lamp lights up. And the safety valve blowing pressure are constantly monitored, and the heating power drops due to a drop in the supply pressure, the supply pressure increases due to an abnormal valve closing pressure (too high), that is, the heating power is too strong, or the safety valve when the safety valve blowing pressure is reached. Gas leaks from the air are prevented beforehand.

According to the invention described in claim (2), when the pressure in the valve chamber falls below the gas appliance use safety pressure (140 mmH ₂ O), the safety pressure detection contact turns on and the solenoid valve operates. As a result, the gas inlet or the gas outlet is shut off, and unburned gas due to a decrease in security pressure is prevented. According to the invention of claim (3), since the operation rod is pressed by the operation of the electromagnetic valve and the valve element at the gas inlet is closed, it is not necessary to newly provide a valve element in the electromagnetic valve. And the structure is simplified. According to the invention of claim (4), since the gas outlet is shut off by manual operation of the solenoid valve and the on / off state for detecting the valve closing pressure can be monitored, the distance between the pressure regulator and the gas appliance can be monitored. The valve closing pressure can be accurately detected without being affected by the piping (pressure drop, leak, etc.).

[Brief description of the drawings]

1 (a) is a longitudinal sectional view showing a self-diagnosis type pressure regulator of the present invention, FIG. 1 (b) is an external perspective view of the self-diagnosis type pressure regulator of the present invention, and FIG. 1 (c) is 2A is a longitudinal sectional view showing another embodiment of the present invention, FIG. 3 is an explanatory view of a conventional pressure checking method, and FIG. 4 is a view showing a conventional pressure regulator. FIG. 1 ... inlet, 2 ... valve body, 4 ... valve chamber, 5 ... diaphragm for pressure adjustment, 7 ... operating rod, 10, 25 ... contact, 1
1,26-28 ... Contact, S, S '... Switch, 13 ... Pressure detecting diaphragm, 20 ... Drive stem, 22 ... Pressure detecting bellows diaphragm, 30,30' ... Solenoid valve, 32 …… Valve for closing the outlet.

Claims (4)

(57) [Claims] A valve body for opening and closing a gas inlet, an operating rod for driving the valve body via a link mechanism, a pressure-adjusting diaphragm connected to the operating rod and defining a valve chamber; A flexible pressure sensing member located in the chamber following the valve chamber, a switch that is activated by displacement of the pressure sensing portion, and the switch is driven to close the gas inlet or the gas outlet. A pressure regulator provided with an electromagnetic valve for performing the operation, wherein the switch comprises: an electric contact provided on the pressure detecting member; and a supply pressure arranged so as to be displaced stepwise with respect to the electric contact. A contact for detecting a valve closing pressure, a contact for detecting a valve closing pressure, and a contact for detecting a safety valve blowing pressure, wherein the safety valve blowing pressure detecting contact is connected to the solenoid valve via a logic circuit, Through the logic circuit A self-diagnosis type pressure regulator, wherein the self-diagnosis type pressure regulator is connected to a flow rate transmitting gas meter, and each of the detection contacts is connected to each pressure abnormality warning lamp. 2. The safety device according to claim 1, wherein the switch includes a contact for detecting a safety pressure for use of a gas appliance, and the contact for detection of a safety pressure for use of a gas appliance is connected to the solenoid valve via the logic circuit. 1) The self-diagnostic pressure regulator according to the above. 3. The self-diagnosis type pressure regulator according to claim 1, wherein the solenoid valve is capable of pressing the operating rod in a valve closing direction. 4. The solenoid valve according to claim 1, wherein each of said detection contacts and said solenoid valve is connected to a controller instead of said logic circuit and said flow rate transmitting gas meter. 2. The self-diagnosis type pressure regulator according to claim 1, wherein the valve is capable of closing the gas outlet.