JPS63111384A - Composite gas valve - Google Patents

Abstract

PURPOSE:To prevent oil leakage which is liable to occur with valve-drive by an electromagnetic pump, by transmitting the rotation of a drive motor to a gear mechanism through a clutch mechanism, and by converting the output of the gear mechanism into a rectilinear movement so as to open and close a composite valve. CONSTITUTION:In a composite gas valve in which two shut-off valves 4, 5 urged in the closing directions by springs are arranged in front and rear of a gas pressure regulator 6, the rotation of a single drive motor 16 is transmitted to a two drive mechanisms 17, 18 through the clutch mechanisms 19, 20 so as to be decreased in its speed, and then the rotation is converted into rectilinear motions by means of eccentric cams 24a, 24b and actuating levers 25, 25 to open and close shut-off valves 4, 5. The opening and closing of the valves are carried out by engaging the clutch mechanisms 19, 20. When the engagement of the clutch mechanisms are released, lock mechanisms 29, 31 are engaged with the gears to hold the opening condition of the shut-off valves 4, 5. With this arrangement, it is possible to open and close the valves with the use of mechanisms, thereby it is possible to prevent oil leakage or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite gas valve that integrates a plurality of valves for controlling gas supply.

[Conventional technology]

As is well known, the gas supply system connects first and second shutoff valves in front and behind each other via a conduit with a gas pressure regulator in between, and connects a burner after the second shutoff valve.
This configuration has a pilot connected between the first shutoff valve and the gas pressure regulator. Recently, a composite gas valve has been considered in which such a gas supply system has an integrated structure and the first and second shutoff valves are driven by an electromagnetic pump.

[Problem that the invention seeks to solve]

However, the configuration in which an electromagnetic pump is used as a means for driving the shutoff valve of the composite gas valve has problems in that oil leaks or the valve opens due to oil expansion as the ambient temperature rises.

This invention was made in order to solve the above-mentioned problems, and is a driving source for the valve that does not cause oil leakage or cause the oil to expand and open the valve as the ambient temperature rises. Our goal is to provide a composite gas valve that allows you to get the desired results.

[Means for Solving the Problems] The composite gas valve according to the first invention includes first and second shutoff valves each having a valve body biased to close a gas passage by a closing spring, and a servo valve. A gas body unit that is integrally formed with a diaphragm and a gas pressure regulator that adjusts gas pressure using a setting part that sets the pressure, a clutch mechanism that transmits the rotation of a drive motor to a gear mechanism, and a clutch mechanism that is provided at the output end of the gear mechanism. The conversion mechanism that converts the rotational motion of the gear mechanism into a linear motion to open the valve body against the closing spring is constituted by a state holding means that holds the valve body in the open state as necessary. Further, the composite gas valve according to the second invention comprises a shutoff valve having a first valve element biased to close the gas passage by a first closing spring; a gas body unit integrally formed with a proportional valve having a second valve body biased to close the gas passage by a second closing spring; a clutch mechanism for transmitting the rotation of the drive motor to the gear mechanism; and the above-described gas body unit. A conversion mechanism is provided at the output end of the gear mechanism and converts rotational motion of the gear mechanism into linear motion to open the valve body against the spring force of the closing spring, and the first valve body is required. an actuator unit consisting of a state holding means for holding the proportional valve in the open state according to the conditions; and a gas pressure control unit provided on the outlet side of the proportional valve to detect the pressure at the outlet and rotate the drive motor in forward and reverse directions. It is something.

[Effect]

The composite gas valve in this first invention rotates a drive motor based on a valve opening request signal, then transmits the rotation of this drive motor to gear m mechanism, and converts the rotation of gears it and i into linear motion. The valve bodies of the first and second shutoff valves are opened against the spring force of the closing spring. Further, in the composite gas valve body according to the second aspect of the invention, the same operation sequence can be used to open the shutoff valve. On the other hand, the proportional valve detects the gas pressure at its outlet with a gas pressure detector, feeds this back to the drive motor, rotates the drive motor in forward and reverse directions, and controls the valve opening of the proportional valve to obtain the desired gas pressure from the outlet. That's what you're trying to get.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings. The drawing is a configuration diagram showing an embodiment of the present invention. In the figure, 1 is a composite gas valve, which is composed of a gas body unit 2 and an actuator unit 3. 4 is a first shutoff valve, 5 is a second shutoff valve, a gas pressure regulator 6 is provided between these first and second shutoff valves 4.5, and a gas pressure regulator 6 is provided between the first and second shutoff valves 4. .5 and the gas pressure regulator 6 constitute a gas body unit 2.

Thus, the first and second shutoff valves 4.5 are provided with closing springs 7.7 so as to close the valve ports 4a and 5a, respectively.
Valve bodies 4b and 5b are provided which are constantly biased by a spring force, and stems 4c and 5e are attached to these valve bodies 4b and 5b.

Further, the first chamber 6a of the gas pressure regulator 6 is communicated via a first communication path 8 with a first pilot chamber 10a of a regulator biloft section 9 that adjusts the gas pressure to a constant level. A second chamber 6 is formed by the main diaphragm 1) that closes the opening 6c of the gas pressure regulator 6.
b is connected to the second pilot chamber 10b by the second communication path 12.
and communicates with the outlet passage of the first shutoff valve 4. 1
3 is a pilot valve of the regulator biloft section 9;
14 is a servo diaphragm, and 15 is a spring that sets the pressure of the regulator pilot section 9.

16 is a drive motor, 17 and 18 are gear mechanisms,
These gear mechanisms 17 and 18 are driven by a drive motor 16 that is a single drive source.
The rotation of the drive motor 16 is transmitted to the drive motors 18 through corresponding clutch mechanisms 19 and 20, respectively. 21 and 22 are conversion mechanisms that convert the rotational motion of the gear mechanisms 17 and 18 into linear motion;
The actuator unit 3 is constituted by the gear a mechanism 17.18, the clutch mechanism 19.20, and the conversion mechanism 21.22.

Therefore, the gear mechanisms 17 and 18 are for decelerating the rotation of the drive motor 16, and the output shaft thereof has a switch operation cam 2.
3a, 23b are pivotally supported, and eccentric cams 24a, 24
b is pivoted. And these eccentric cams 24a, 24
b is the above-mentioned stem 4c.

5c is abutted by a rotatable operating lever 25, 25 which reciprocates against the spring force of the closing springs 7, 7. The eccentric cams 24a, 24b and the operating levers 25.25
These constitute converters 21 and 22. 26 is a switch operated by the switch operation cam 23a, 27
is a switch operated by the switch operation cam 23b.

The clutch mechanism 19 is disengaged when the switch 26 confirms that the valve body 4b is fully open and energizes the solenoid 28.When the clutch mechanism 19 disengages, the gear mechanism 17 is kept in a state-holding state so that it does not reverse rotation. A locking mechanism 29 is configured to engage the gear. The clutch mechanism 20 is engaged by the excitation of the solenoid 30, and when the clutch mechanism 20 engages, rotation is transmitted to the gear mechanism 18, and when the switch 27 confirms that the valve body 5b is fully open, the rotation of the drive motor 16 is stopped. Then, to prevent the gear mechanism 18 from rotating in reverse, a reverse rotation preventing pawl 31 serving as a state holding means is configured to engage with the gear.

Next, the operation will be explained.

When there is a heat demand and a request to open the valve, the drive motor 16
starts rotating. In this state, the solenoid is 28.30
Since both are in the de-energized state, the clutch machine t1)1
9 is in an engaged state, and the clutch mechanism 20 is in a non-engaged state. Therefore, the rotation of the drive motor 16 is decelerated by the gear mechanism 17 and transmitted to the eccentric cam 24a. Then, the operation lever 2 is rotated by the rotation of the eccentric cam 24a.
5 to the stem 4C of the first shutoff valve 4 via the closing spring 7
Press down against the spring force to open the valve body 4b.

When the switch 26 confirms that the valve body 4b of the first shutoff valve 4 is fully open, the solenoid 28 is energized, the clutch mechanism 19 is disengaged, and the rotation of the drive motor 16 is transferred to the gear mechanism 17. In addition to preventing transmission,
The locking mechanism 29 is engaged with the gear to maintain the fully open state of the first circuit breaker 4.

Next, when the solenoid 30 is energized after the switch 26 is operated, the clutch mechanism 20 becomes engaged and the drive motor 1
6 is transmitted to the eccentric cam 24b while being decelerated by the gear mechanism 18. Then, the rotation of the eccentric cam 24b causes the stem 5 of the second shutoff valve 5 to be opened via the operating lever 25.
C against the spring force of the closing spring 7 to open the valve body 5b.

When the switch 27 confirms that the valve body 5b of the second cutoff valve 5 is fully open, the drive motor 16 is stopped.

Even if the drive motor 16 is stopped, the clutch mechanism 201'J<
Since the anti-reverse claw 31 is engaged with the gear due to the meshing, the valve body 5b of the second shutoff valve 5 maintains the fully open state.

In this way, the first and second shutoff valves 4, 5 are opened and gas passes through the gas body unit 2 and is supplied to the burner (not shown), but the gas pressure regulator 6 is Gas is supplied while adjusting the pressure in the first chamber 6a to the gas pressure set by the pilot section 9. Now, when the main diaphragm 1) opens and the pressure inside the first chamber 6a increases, the first
Gas is introduced into the pilot chamber 10a and pushes up the servo diaphragm 14. Therefore, the opening degree of the pilot valve 13 becomes small and the amount of gas guided to the second pilot chamber 10b via the second communication passage 12 becomes small, so that the gas is exclusively directed to the outlet passage of the first shutoff valve 4. The main diaphragm 1) is pushed up and the gas pressure regulator 6 is guided through the second communication path 12 to the second chamber 6b.
Narrow the valve opening. Therefore, the pressure inside the first chamber 6a decreases and pressure adjustment is performed.

On the other hand, when closing the first cutoff valve 4 and the second cutoff valve 5, the solenoids 28 and 30 are de-energized and the clutch mechanism 1
9 is engaged, and the clutch mechanism 20 is disengaged. As a result, the locking mechanism 29 of the first shutoff valve 4 is disengaged and the drive motor 16 can be reversed, so that it is closed by the spring force of the closing spring 7, and the second shutoff valve 5 is closed by the reversal prevention pawl 31. Since the lock is released, it is similarly closed by the spring force of the closing spring 7.

In the above embodiment, an example was explained in which the gas body unit 6 was configured by the first and second shutoff valves 4.5 and the gas pressure regulator 6. Remove the reversal prevention claw 31 that maintains the state of
If the drive motor 16 is controlled to rotate in forward and reverse directions based on the gas pressure detected by the gas pressure controller 32, the gas pressure output from the gas body unit 2 can be kept constant. In this case, the second shutoff valve operates as a proportional valve to keep the gas pressure constant, and therefore the gas pressure regulator shown surrounded by a dashed line in the drawing becomes unnecessary. Note that all other configurations are the same as in the above embodiment.

Further, in the embodiment described above, two sets of gear mechanisms are operated by one drive motor, but the same effect as in the embodiment described above can be obtained even if a drive motor is provided for each gear mechanism individually.

〔Effect of the invention〕

According to the present invention, the actuator unit constituting the composite gas valve is composed of a clutch mechanism, a state holding means interlocked with the clutch mechanism, and a switch that detects the full stroke of the output shaft and issues a two-position signal. Since the gas body unit is composed of the first and second shutoff valves and the gas pressure regulator, there is no need to use the valve drive source as a source of inconvenience, such as the risk of oil leakage or the valve opening as the ambient temperature rises. Moreover, by using a proportional valve as the second shutoff valve, there is an effect that a gas pressure regulator is not required and a smaller size can be obtained.

[Brief explanation of the drawing]

The figure is a configuration diagram showing an embodiment of a composite gas valve according to the present invention. 1... Composite gas valve, 4... First shutoff valve, 5...
Second shutoff valve, 4b, 5b... Valve body, 6... Gas pressure regulator, 7... Closing spring, 9... Regulator pilot part, 14... Servo diaphragm, 1
6... Drive rake, 17.18... Gear mechanism, 19
．． 20...Clutch mechanism, 21.22...Conversion mechanism, 32...Gas pressure controller.

Claims (2)

[Claims] (1) first and second shutoff valves each having a valve body biased to close a gas passage by a closing spring;
and a gas pressure regulator that is formed integrally with the second shutoff valve and that adjusts the gas pressure using a servo diaphragm and a regulator pilot section that sets its pressure, and a gas pressure regulator that transmits the rotation of a single drive motor to a two-set gear mechanism. a clutch mechanism, and two sets of converters provided at the output end of the gear mechanism to convert rotational motion of the gear mechanism into linear motion so as to open the valve body against the spring force of the closing spring. A composite gas valve comprising: a mechanism; and a state holding means that engages with the gear mechanism so as to hold the valve body in an open state as required. (2) A shutoff valve having a first valve element biased to close the gas passage by a first closing spring; and a shutoff valve integrally formed with the shutoff valve, and a gas passage a proportional valve having a second valve body biased to close the valve; two sets of clutch mechanisms that transmit the rotation of a single drive motor to two sets of gear mechanisms; provided,
two sets of conversion mechanisms that convert rotational motion of the gear mechanism into linear motion so as to open the valve body against the spring force of the closing spring, and the first valve body is in an open state as necessary. and a gas pressure controller provided on the outlet side of the proportional valve to detect the pressure at the outlet and rotate the drive motor in forward and reverse directions. Combined gas valve.