JPS6057077A - Electrically driven gas pressure controller - Google Patents

Abstract

PURPOSE:To make it possible to controll the gas pressure with the reduced electric power, by controlling the motor of an electrically driven pressure proportional controlling valve, which regulates the gas flow by changing the spring power, according to a load signal. CONSTITUTION:While water, which streams through a heat exchanger 11, is not heated yet, resistance of a temperature detecting element 12 stays in the maximum value, a motor 26 of an electrically driven pressure proportional controlling valve 34 is revolved through a proportional controlling circuit 37, a slide pin 22 is pushed downward by a cam 25, and the combustion quantity of a burner is increased to the maximum. As a signal of a position detector, which detects the motion placement of a movement transmission mechanism, is input into the proportional controlling circuit 37, the motor 26 can be stopped at that position. When the hot water temperature rises and resistance of the temperature detecting element 12 becomes lower, the motor 26 is revolved in reverse direction as the supplying gas pressure to the burner becomes lower. If the heated water flow is increased/decreased, or the water temperature is changed, the hot water temperature is kept at an almost fixed value, because the proportional controlling circuit 37 controls the motor 26.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a gas pressure control device for household gas appliances, particularly a so-called electric type using a motor.

Conventional structure and imitation points As shown in FIG. 1, this type of conventional gas pressure control device has a valve body 1 facing a valve seat 2, a valve body 3, a diaphragm 4 fixed to the valve body 3, and The force of the spring 5, which adjusts the gas pressure supplied to the burner 7, is transferred to the motor 8171: the screw 9 is rotated, and the nut 10, which is stopped from rotating, is activated by the spring 5. 5′t″
Expand and contract to change.

The gas combusted by the burner 7 completely heats the water supplied to the heat exchanger 11, and the outlet temperature is detected by the total temperature detection element 12 and sent to the control circuit 13 as a load signal. Therefore, the control circuit 13 drives the motor 8 in response to changes in the so-called load such as changes in the amount of hot water dispensed or changes in the water temperature, and increases or decreases the spring 5's working load, thereby controlling the amount of combustion in the burner 7 fully automatically. Acts to adjust the hot water temperature control circuit 1
The temperature is controlled to be maintained at the temperature set in step 3. Further, a gear 15 is fixed to the shaft 14 of the motor 8.
A gear 18 is provided which is fixed to the shaft 17 of the potentiometer 16 in mesh with the gear 18 and is configured to input the signal of the potentiometer 16 to the control circuit 13 . This is to detect the motor rotation position at which the minimum combustion amount and maximum combustion amount of burner 7 occur, and it acts to control the combustion in burner 7 within the range from the minimum combustion amount to the maximum combustion amount. It is. However, with this configuration, if there is a power outage during use, the motor 8 will stop at the position at the time of the power outage and the gas will be left to burn, so in order to automatically extinguish the power source, the solenoid valves 19 and 20 are installed in the equipment. When the burner 7 is required to stop burning during a power outage or during normal use, the gas must be cut off and the fire extinguished by stopping the energization to the solenoid valves 19 and 20. In particular, in order to ensure reliable safety, two solenoid valves 19 and 2 (1-1) are required, which has had problems such as increasing the pressure drop in the gas passage of the equipment and making the equipment expensive. .

OBJECTS OF THE INVENTION The present invention eliminates such conventional problems, and aims to realize an inexpensive device that can control gas pressure with low electric power, can safely shut off the gas valve in the event of a power outage.

Structure of the Invention To achieve this object, the present invention comprises a valve body forming an inlet, an outlet, and a valve seat in a gas supply circuit, a valve body, a diaphragm, a spring, a motor, and a valve body that transmits the rotation of the motor to the spring. a motion transmission mechanism for controlling the movement of the motor; a position detector for detecting the operating position of the motion transmission mechanism; The electric pressure proportional control valve is provided with a proportional control circuit for controlling the motor of the electric pressure proportional control valve according to a load signal, and a power failure closing circuit. With this configuration, the electric pressure proportional control valve has the function of controlling the rotation of the motor to the valve closing position in the event of a power outage.

DESCRIPTION OF EMBODIMENTS A practical example of the present invention will be described below with reference to FIGS. 2 and 3. In FIG. 2, a valve seat 2, a valve element a1, a diaphragm 4, springs 5 and 6, etc. are stored inside a valve body 21 as in FIG. 1. However, when compared to the first, spring 6
Regarding the conventional example shown in Fig. 1, the set spring pressure was small enough to lift the self-weight of the valve body 3, etc.
In one embodiment of the present invention, the set spring pressure is relatively large enough to press the valve body 3 against the valve seat 2 and close it.

Further, in order to close off the gas, at least one of the valve body 3 and the valve seat 2 is made of an elastic material such as rubber.

A slide pin 22 is slidably supported on the upper part of the spring 5 via a spring receiver (not shown), passing through a low-friction bearing portion 24 of the upper cover 23. The upper end of the slide pin 22 is in contact with a cam 25, and the cam 25 has a worm l fixed to the shaft of a motor 26, a gear 28 with which the worm 27 meshes, and a worm 29 formed coaxially with the gear 28, which meshes with the worm l. gear 30. The rotation of the motor 26 is transmitted through the shaft 32 of the potentiometer J at a reduced speed. The motor 26, the gear 2B, the potentiometer 25, etc. are supported by a 7%+7 rung made of sheet metal, and the housing 33 is fixed to the upper cover 23 with screws. Therefore, the rotation of the motor 26 is caused by the worm 27.
, gear 28, worm 29, gear 30. The electric pressure proportional control valve 34 expands and contracts the spring 5 through a motion transmission mechanism 33 consisting of the shaft 32 of the potentiometer 31, the cam 25, and the slide pin 22.
There is a solenoid valve 36 in front of the valve body 5, and a temperature sensing element 12 is located downstream of the outlet (not shown) of the valve body 21. The temperature signal and load signal are electrically connected to the proportional control circuit h1337, and the proportional control circuit 37 and the motor 26 are electrically connected.Similarly, it is a position detector that detects all operating positions of the motion transmission mechanism. potentiometer 31 and proportional control circuit 37, potentiometer 31 and power failure closing circuit 38,
The motor 26 and the power failure closing circuit 38 are also electrically connected to each other.

In the above configuration, if the hot water tap (not shown) is fully opened and hot water supply is fully started, the water flowing through the heat exchanger 11 has not yet been heated, so the resistance of the temperature detection element 12 that detects the hot water temperature which is the load signal is the largest, and the motor 26 of the electric pressure proportional control valve 34 is rotated via the proportional control circuit 37 to push down the slide pin 22 and the spring 5 with the cam 25, and the combustion amount of the burner 7 is reached at a maximum of 1iff'. Moves with t. The reason why the spring 5 is compressed to the gas pressure at which the burner 7 reaches the maximum combustion amount is because the signal from the position detector consisting of the potentiometer 31 that detects all operating positions of the motion transmission mechanism is input to the proportional control circuit 37. The motor 26 can be stopped at that position. When the temperature of the hot water flowing through the heat exchanger 11 rises and reaches the temperature preset by the proportional control circuit, and the resistance of the temperature detection element 12 decreases, the motor 26 reverses to increase the supply gas pressure to the burner 7. Rotate all the way down. In addition, when the so-called hot water supply load fluctuates, such as by adjusting the amount of hot water dispensed or changing the water temperature, the proportional control circuit 37 controls the motor 26 according to the load, and the hot water temperature is kept approximately constant.

In addition, if a power outage occurs for some reason during use, the solenoid valve 36 will close at the same time as the power outage, and the combustion of the burner 7 will disappear.
The motor 2ett of No. 4 is driven to rotate the valve body 3 at the position 1 where the valve seat 2 is fully closed, and the potentiometer 31 detects when the valve body 3 is in the closed position and stops the operation. The type pressure proportional control valve 34 reliably shuts off the gas, and the solenoid valve? This has the effect of ensuring a high degree of safety by doubly closing the gas flow path without having to install two directly in the gas flow path. Using one solenoid valve instead of two means that there is less pressure loss in the gas flow path during combustion, and the maximum combustion amount can be ensured without increasing the flow path diameter of the solenoid valve or thickening the pipe diameter. This has the effect of making the equipment smaller and cheaper. Of course, the cost for each solenoid valve will be lower.

A specific circuit configuration of the present invention will be explained with full reference to FIG. 39 is a DC power supply circuit for driving an electric pressure proportional control valve, which includes an AC power supply 40, a step-down transformer 41, an aftereffect rectifier diode bridge 42, and a smoothing capacitor 43, which is f7/l.
has been completed. 38 is a power failure closing circuit, which includes a diode 45, transistors 46, 47, and resistors 48, 49, and 50.
, 51, a large capacitor 52, a comparator 53, and a potentiometer 31. The proportional control circuit 37 is composed of resistors 55, 56, 57, 58, comparators 59, 60, temperature detecting element 12, and potentiometer 31. The motor 26 is connected to a DC morph drive IC 61. In the proportional control circuit 37, the comparator 59.60
are the resistance of the temperature sensing element 12, the divided potential of the resistance 57.58, and the potentiometer 31.
Depending on the divided potentials, a signal is sent to the DC motor drive IC 61 to cause the motor 26 to rotate forward, reverse, or stop. In addition, in the power failure closing circuit 38,
When there is no power outage, the transistor 46 is in the ON state, so the transistor 47 is also in the ON state, and the comparator 53 does not drive 5IC61 by the divided potential of the resistors 50 and 51.

However, when a power failure occurs, the transistor 46 goes to 0FFL, and therefore the transistor 47 also turns off. In the case of power outage, the IC 61 reverses the motor 26 by the action of the comparator 53 due to the electric potential stored in the large capacitor 52, and the valve body 3 rotates until it reaches the position of the potentiometer 31 that completely closes the silkworm, and then stops. do. In this way, the power failure closing circuit 38 includes a power failure detection section consisting of resistors 48 and 49, transistors 46 and 47, and a diode 45, and a large capacity capacitor +152.
<Tuck-up power supply section, potentiometer 31, resistor 50
51, and a comparison section consisting of a comparator 53.
It has the effect of being able to reliably detect all power outages and close the valve body a without using movable contacts such as relays, and the potentiometer 31 can be used as a position detector for both AK and AK during proportional control and during power outages. Since there is no need to install a closed position switch or the like, the structure is simple, highly reliable, and inexpensive.

In addition, the main part of the motion transmission mechanism 33 is composed of a gear and a position detector 31.The shaft 32 of the detector 31 is configured as a paulownia tree that transmits the rotational force of the motor 26. Not only does it take up extra space and become more compact, but the extra transmission allows for position detection. Therefore, there is an effect that errors and deviations between the deflection setting pressure of the spring 5 and the position detection can be reduced without causing unnecessary crashes.

Effects of the Invention As described above, the electric gas pressure control device of the present invention provides the following effects.

(1) Either the valve seat or the valve body A is made of an elastic body,
This electric pressure type is composed of a diaphragm, a spring, a motor, a motion transmission mechanism that transmits the movement of the motor, and a position detector that detects all operating positions of the motion transmission mechanism, and has a closing function that adjusts and closes the gas pressure by the rotation of the motor. a proportional control valve;
The structure consists of a proportional control circuit that controls the motor according to the load signal, and a power failure closing circuit that controls the motor's full rotation at the valve closing position in the event of a power outage. It will always be effective if we can create a safe and inexpensive device that always closes no matter what happens.

(2) Since the control uses a low-power motor to control the combustion amount and complete closure by pressure control, all the governors and solenoid valves are redundantly used, and there are fewer functional parts that make up the equipment t. Due to its simplicity, it is possible to create small, inexpensive, and highly reliable equipment.

[Brief explanation of the drawing]

Figure 1 is a system diagram of a conventional electric gas pressure control device.
FIG. 2 is a system diagram showing one embodiment of the electric gas pressure control device of the present invention, and FIG. 3 is a circuit diagram showing an example of the electric control circuit of the electric gas pressure proportional control valve. 2... Valve seat, 3... Valve body, 4...
...Diaphragm, 5.6...Spring, 21...
... Valve body, 26 ... Motor, 28.30
... Gear, 31 ... Position detector, 33
...Motion transmission mechanism, 34...Electric pressure proportional control valve, 35...Inlet, 37...Proportional control circuit, 38...Power failure closing circuit. Name of agent: Patent attorney Toshi Nakao, Idiot 1
Figure 13 Figure 2

Claims (1)

[Scope of Claims] (1) A valve body having an inlet, an outlet, and a valve seat all formed in a gas supply circuit, a valve body, a diaphragm, a spring, a motor, and a motion transmission mechanism that transmits the rotation of the motor to the spring. , a position detector that detects the operating position of the motion transmission mechanism, and a force of the spring that adjusts the gas pressure by rotation of the motor? an electric pressure proportional control valve that adjusts and closes the gas flow rate by changing the gas flow rate; a proportional control circuit that controls the motor of the electric pressure proportional control valve according to a load signal; and a proportional control circuit that controls the rotation of the motor to the valve closing position in the event of a power outage. An electric gas pressure control bag @ consisting of a power failure shutoff circuit. ? ) The electric gas pressure control device according to claim 1, wherein the position detector is a potentiometer and is configured to detect the closing position not only during proportional control but also when closing during a power outage. (3) The main part of the motion transmission mechanism is composed of a gear, a position detector, and a sword S, and the shaft of the position detector is constructed as a member that transmits the entire rotational force of the motor. Electric gas pressure control device. (4) The electric gas pressure control device according to claim 1, wherein the power failure closing circuit includes a power failure detection section, a backup power supply section 2, and a comparison section. 5) The electric gas pressure control device according to claim 4, wherein the backup power source is constituted by a large capacity capacitor.