JPS6010229B2 - fluid control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid control device that controls the flow rate of fluid by the opening degree of a valve.

Recently, a flow rate proportional control valve has been developed to control the flow rate of fluid such as gas. For example, when applying this proportional control valve to control the amount of gas supplied to a gas burner, it is necessary to control the gas flow rate based on the characteristics of the gas burner. If the flow rate falls below a certain level, incomplete combustion, backfire, etc. will occur, so a valve with a configuration that will not restrict the flow rate below this level was required.

For this reason, there is a method in which a bypass is installed in parallel with the proportional valve to flow the minimum gas flow rate (hereinafter referred to as the minimum flow rate) that does not cause incomplete combustion in the burner, and the flow rate is not reduced below this flow rate, or the signal that drives the proportional valve is set to the minimum flow rate. Attempts have been made to shut off the gas by abruptly closing the valve when the value reaches .
There were various problems such as reliability (explained later).

The present invention provides a valve device with high industrial value that solves these problems.

The present invention will be explained below with reference to the drawings.

In the explanation of the present invention, an electromagnetic proportional control valve that controls the valve function by balancing the electromagnetic force generated in accordance with the current flowing through the electromagnetic coil and the leaf spring force will be used, and as an application example,
Temperature control of a gas instantaneous water heater will be explained using the proportional valve and electronic control circuit described above. First, Figures 1 to 4
The figure shows a conventional example and its configuration and problems will be explained.

In Fig. 1, the proportional valve 1 is provided with a bypass 2 and an inlet 3.
The amount of gas supplied from the burner 4 to the burner 4 is controlled by the proportional valve 1, and even when the proportional valve 1 is closed, the minimum flow rate is always supplied by the bypass 2. Further, gas closure is performed by a solenoid valve 5 connected in series with the proportional valve 1. FIG. 2 shows this characteristic diagram. The horizontal axis is the proportional valve coil current 1,
The vertical axis is the gas flow rate Q. In the figure, part A is the proportional band, which is when the proportional valve 1 is performing a control operation. However, when current 1 decreases and reaches point B, proportional valve 1 closes but solenoid valve 5 remains open, so gas flows from bypass 2 and changes with the flow rate controlled by bypass 2. It disappears. The gas is closed by configuring the control circuit so that when the current 1 further decreases and reaches point C, the solenoid valve 5 closes.
Further, the point at which the electromagnetic valve 5 is opened can be freely set from point C to point D depending on the circuit configuration. Using this method requires another electromagnetic valve in addition to the proportional valve, which is expensive, and there are also problems in that the gas passage resistance increases.

FIG. 3 shows another example in which gas flowing in from a gas inlet 6 passes through a proportional valve 7 and is sent to a gas burner 8.

In this case, as shown in FIG. 4, the circuit is constructed so that when the proportional valve coil current decreases and the gas flow reaches a current value F at which the gas flow becomes the minimum flow E, the current suddenly becomes zero. According to this method, since the current 1 is used to detect when the gas flow rate Q has reached point E, the E point may shift due to variations in valve characteristics or gas type conversion, making highly accurate control impossible. (
(See Figure 4 Q, , Q2).

This sometimes posed the risk of incomplete combustion in the burner. Next, an example considered prior to the present invention is shown in FIG. 5 and subsequent figures.

FIG. 5 is a state diagram of an example considered prior to the present invention.

A rubber valve 11 is loosely attached to one end of a plunger 10 that moves up and down proportionally in response to electromagnetic force generated by an electromagnetic coil 9. The valve 11 is pressed against the valve seat 13 by a plate spring 12 when no current is passed through the coil 9 arranged to face the valve seat 13. Inside the valve seat 13 is a valve body regulating member 15 that is driven up and down by an electromagnetic solenoid 14.
A fluid seal 18, a coil spring 16, and a regulating adjustment ring 17 are provided. Next, this operation will be explained.

FIG. 5 shows a state in which the coil 9 and the electromagnetic solenoid 14 are not energized, and the valve 11 is in close contact with the valve seat 13 to cut off gas.

Next, FIG. 6 shows a state in which the electromagnetic solenoid 14 is energized.

In this state, the valve 11 is raised from the valve seat 13 by the amount necessary to flow the maximum flow rate determined by the characteristics of the gas burner (not shown). This special increase amount is set in advance by the regulation position adjustment ring 17. Next, coil 9
As the current is gradually increased, the plunger 10 is pulled upward by the electromagnetic force, and the valve 11 is raised above the valve body regulating member 15, and the valve 11 is moved upward according to the opening degree of the valve 11 and the valve seat 13. Proportional control of gas flow rate.

(Fig. 7) However, in the example considered prior to the present invention described above, the fluid control device having the configuration shown in Figs. must be obtained appropriately and reliably, and since the diameter of the valve seat 13 is relatively large, it is necessary to precisely adjust the stop position of the valve body regulating member 15. Adjustment using the adjustment ring 17 may take time.
There were problems such as a slight adjustment deviation in the flow rate resulting in large variations in the flow rate value.

The present invention overcomes the problems of the prior art and the problems of the examples considered prior to the present invention, in that between the fluid inlet and the outlet,
The valve body includes a valve seat, a valve body that opens and closes the valve seat while being displaced approximately in proportion to electrical input, and a valve body regulating member that regulates drive of the valve body and moves by electrical means. A sub-valve seat is formed in the part of the regulating member that supports the valve body, and the inside of the sub-valve seat is guided to the fluid outflow port, and the inside of the sub-valve seat is formed between the ascending valve seat and the valve seat, or between the sub-valve seat. A flow rate regulating passage is provided to allow a minimum constant flow rate of fluid to flow.

With this configuration, the flow rate of fluid is continuously controlled while the valve body is not in contact with the valve body regulating member when the valve body regulating member is set at the regulating position, and the valve body When in contact with the regulating member, a limited maximum or constant flow rate is allowed to flow, and when the valve element closes the valve seat with the valve element regulating member set to the release position, the fluid is closed. It acts on FIG. 8 shows an embodiment of the present invention.

In FIG. 8, the valve body regulating member 15 has an auxiliary valve seat 151 formed in a portion supported by the valve 11, a gas guide passage 152 provided inside and on the side thereof, and a flow rate regulation passage 19 provided inside the valve seat 13. It was established.

The same numbers are attached to some villages that are the same as those in Figures 5 to 7. In the above configuration, when the coil 9 and the electromagnetic solenoid 14 are not energized, the valve 11 is in close contact with the valve seat 13 to block fluid, and when the electromagnetic solenoid 14 is energized next, the valve body regulating member having the sub-valve seat 151 15 overcomes the force of the coil spring 16 and the leaf spring 12 and lifts up while in contact with the valve 11, and the fluid is restricted to a minimum constant flow rate passage 19 provided between the valve seat 13 and the Toyama valve seat 151. The adjustment of the regulation position adjustment ring 17 allows the minimum flow rate to be obtained in the small-diameter flow regulation passage 19, so that the minimum constant flow rate can be accurately obtained. It has the effect of being able to

Note that the same effect can be obtained even if the flow rate regulating passage 19 is provided on the side wall of the Liu valve seat 151. Next, when the current in the coil 9 is gradually increased, the plunger 1 is pulled upward by the electromagnetic force, and the valve 11 becomes full. It is raised above the valve seat 151 and proportionally controls the gas flow rate according to the relationship between the valve 11 and the sub-valve seat 151 (FIG. 8). When the current in the coil 9 is gradually decreased, the gas flow rate is controlled in proportion to the current in the coil 9, and the gas flow rate is controlled in proportion to the current in the coil 9. is the valve body regulating member 16 (
When it comes into contact with the sub-valve seat 151), even if the current in the coil 9 is reduced below the current in the coil 9, the valve 11 will not move and the predetermined minimum flow rate will continue to flow.

When the electric current of the electromagnetic solenoid 14 is cut off by a signal from a control circuit (not shown), the valve body regulating section 15 is moved downward by the coil spring 16, and the valve 11 is instantly closed. The current of this coil 9 and the on-0 of the electromagnetic solenoid
The timing of 8 can be freely set by the control circuit depending on the burner and equipment.

For example, when flowing gas from a gas closed state (Figure 5),
A current may be applied to the coil 9 so that the valve is suddenly fully opened, and at the same time, the electromagnetic solenoid 14 may also be energized. Figure 9 shows the current 1 of the coil 9 and the gas flow rate Q in the embodiment of the present invention.
shows the characteristics of In the figure, part G is in the proportional region and is in the state shown in Figure 8. When proportional control is being performed, when the valve 11 is in contact with the sub-valve seat 151 at the minimum flow rate, J is closed. When the valve 11 is in contact with the valve seat 13 in the area, K is the valve 1
1 is when the burner is fully open and burning with the full power of the burner. L
At this point, the control circuit turns off the electromagnetic solenoid 14, and at the same time, the current in the coil 9 is also turned OFF. Figure 10 is a system diagram in which the present invention is applied to a gas instant boiler.
Water flowing in from 01 undergoes heat exchange in a heat exchanger 102 and exits as hot water from a faucet 103, while gas flows through an inlet 104.
It flows through the gas tank 105 and is coupled to the burner 107 from the proportional valve 106.

108 indicates a pilot burner.

Here, a temperature sensor 109 (using a negative temperature-sensitive resistance element in this example, hereinafter referred to as a thermistor) is provided at the hot water supply outlet, which detects the hot water temperature and sends a signal to the control circuit 11.
Send to 0.

The current signal is compared and amplified with the set temperature in the control circuit 110 and sent to the proportional valve 106. If you increase the amount of hot water when hot water is currently being supplied from the faucet, the temperature of the thermistor 109 will drop, so the current of the proportional valve 106 will increase, increasing the amount of gas, preventing the temperature from dropping, and increasing the amount of hot water being supplied. If it decreases, the gas is throttled to prevent temperature rise. This characteristic is shown in FIG.

The axis indicates the flow rate Qw of hot water from the faucet 103, and the vertical axis indicates the temperature T of the hot water supply. Curve N is the characteristic of an uncontrolled moat boiler, and as the amount of hot water supplied increases, its temperature decreases. If the temperature is controlled accordingly, the temperature will be constant at the set temperature To regardless of the flow rate. However, when the hot water supply amount Qw reaches 0 points or more, the capacity of the moat loom is full and the water is on the N line. In addition, in the P section, the load gas requirement is 9th.
This figure shows a state in which the proportional valve operates on and off on the lines L and R when the gas flow rate is below the point M shown in the figure. Further, the set temperature To can be freely changed by setting the control circuit. As described above, the fluid control device of the present invention provides the following effects.

m. A valve body whose displacement is approximately proportional to the electric input, and a valve body regulation member that regulates the drive of the valve body and moves by electrical means are provided, and the valve body regulation member of the valve body is provided with a Since the configuration has a sub-valve seat and a flow regulating passage between the sub-valve seat and the valve seat or on the valve seat, one valve (flow control device) can be used with only an external electrical signal. This has the effect of easily and reliably obtaining proportional control of the fluid, a constant proportional control lower limit flow range, and a closed state.

[2] If applied to control the combustion amount of gas combustors,
Excellent effects can be expected.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an example of a conventional fluid control means, and FIG.
Figure 3 is a diagram of its flow rate control characteristics, Figure 3 is a configuration diagram of another conventional fluid control means, Figure 4 is its flow rate control characteristic diagram, and Figure 5 is a diagram of a fluid control device in an example considered prior to the present invention. 6 and 7 are explanatory diagrams of the same operation, FIG. 8 is a sectional view of a fluid control device in an embodiment of the present invention, FIG. 9 is a flow rate control characteristic diagram thereof, and FIG. 10 is a gas hot water FIG. 11 is a diagram showing the hot water temperature characteristics when applied to the burner output control of a boiler. 11... Valve body, 13... Valve seat, 14...
...Electromagnetic solenoid, 15...Valve body regulation member, 19...Flow rate regulation passage, 151...
Deputy Benza. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Scope of Claims] 1. Between a fluid inlet and an outlet, there is provided a valve seat, a valve element that opens and closes the valve seat while being displaced approximately in proportion to electrical input, and controls the driving of the valve element. , a valve body regulating member that moves by electrical means, a sub-valve seat is formed at a portion of the valve body regulating member that contacts the valve body, and the interior of the sub-valve seat is electrically connected to the fluid outlet. At the same time, a flow rate regulation passage is provided between the sub-valve seat and the sub-valve seat or in the sub-valve seat to allow a fluid to flow at a limited minimum constant flow rate, and when the valve body regulation member is set at the regulation position, the valve The flow rate of the fluid is continuously controlled while the body is not in contact with this valve body regulating member, and when the valve body is in contact with this valve body regulating member, a limited minimum constant flow rate is caused to flow, and the fluid flow is controlled continuously. A fluid control device configured to close fluid when the valve body closes the valve seat with the regulating member set at the release position. 2. The fluid control device according to claim 1, wherein the valve body regulating member is driven by an electromagnetic solenoid. 3. The fluid control device according to claim 1, which is configured to be able to adjust the regulating position of the valve body regulating member.