JPH07217766A - Solenoid valve device - Google Patents

Abstract

PURPOSE:To enhance the adjustability of a solenoid valve device with a simple structure by providing an electromagnetic force generating means for applying an electromagnetic force to a movable iron core integrally incorporated with a valve element, and a resilient member having a spring constant which increases with a displacement overcoming the operating force of the electromagnetic force generating means. CONSTITUTION:An electromagnetic device 7 is composed of a valve part 8 and an electromagnetic force generating means 9, the valve part 8 including a valve body 10 having a fluid inlet port 10a, an outlet port 10b and a valve port 10c. A valve element 11 is located facing the valve port 10c so that the flow rate can be adjusted by displacing the valve element 11. In the electromagnetic force generating means 9 which is composed of a coil 15, a stationary iron core 16 and a yoke 17, magnetic flux generated from the coil 15 passes through the yoke 17 and the stationary iron core 16 so as to generate an attractive force between the stationary core and a movable core 14. When current running through the coil 15 is increased, the attractive force is generated between the stationary iron core 16 and the movable iron core 14 which is therefore moved to a position where it is balanced with the spring 9. Accordingly, the opening degree of the valve element 11 can be steplessly adjusted by changing the degree of current running through the coil 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve device for adjusting the amount of water such as a water heater.

[0002]

2. Description of the Related Art In a conventional electromagnetic valve device of this type, as shown in FIG. 8, a movable iron core 3 is attached to a valve body 2 provided in a valve body 1, and the movable iron core 3 is generated by a solenoid coil 4. A spring 5 is provided to attract the electromagnetic force of the movable iron core 3 against the force of the movable iron core 3, and a spring 6 is provided to bias the valve body 2 in the closing direction. The opening of 2 was controlled.

[0003]

However, in the above-mentioned conventional solenoid valve device, since the two springs always act on the valve body 2 and the movable iron core 3, the spring constant is the sum of the two spring constants. Therefore, it is almost constant regardless of displacement. Therefore, in order to improve the adjustability (rate of change of flow rate with respect to current of solenoid coil 4), the characteristic of the electromagnetic force with respect to the displacement of the movable iron core 3 needs to be linear according to the spring constant. Since the characteristic of the flow rate with respect to the displacement of 1 must be made almost linear, the shape of the valve body 2 must be made complicated.

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and an object thereof is to provide a solenoid valve device having a simple shape and good adjustability.

[0005]

In order to achieve the above object, the solenoid valve device of the present invention has the following configuration.

[0006] The valve body, a movable iron core integrally attached to the valve body, an electromagnetic force generating means for applying an electromagnetic force to the movable iron core, and an operating force of the electromagnetic force generating means, which accompanies displacement. And an elastic body having a large spring constant.

Further, a first elastic body which constantly acts on the valve body,
And a second elastic body that operates at a position where the valve body is displaced by a predetermined amount.

Further, the second elastic body urges only in the vicinity of the closing of the valve body. Further, a heat exchanger, a bypass path bypassing the heat exchanger, a valve element provided in the bypass path, and a tap water temperature detector provided in the mixing section of the bypass path and the heat exchanger, It is provided with an electromagnetic force generating means for driving the valve body, and an elastic body which opposes the electromagnetic force generating means and whose spring constant increases with displacement.

[0009]

According to the present invention, the position of the valve body is adjusted by operating the movable iron core by the electromagnetic force generating means against the force of the elastic body.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, an electromagnetic valve device 7 mainly comprises a valve portion 8 and an electromagnetic force generating means 9, and a valve body 10 is provided in the valve portion 8 and has a fluid inlet 10a, an outlet 10b and a valve opening 10c. . Further, the valve body 11 is opposed to the valve opening 10c.
The flow rate is adjusted by the movement of the valve body 11. A diaphragm 12 having an effective pressure receiving area substantially the same as that of the valve opening 10c is attached to the valve body 11 by a movable iron core 14 with the pressure receiving body 13 interposed therebetween. Communication holes 11a and 14a are opened in the central portions of the valve body 11 and the movable iron core 14, respectively, and the pressures of the fluids acting on the valve body 11 and the diaphragm 12 are balanced. The electromagnetic force generating means 9 has a coil 15
There is a fixed iron core 16 and a yoke 17, and the magnetic flux generated in the coil 15 passes through the yoke 17 and the fixed iron core 16 to generate an attractive force between the fixed iron core 16 and the movable iron core 14. A plug A18 is provided under the fixed iron core 16 to seal the fluid. A spring 19 acts on the movable iron core 14 in a direction in which the valve body 11 opens. 20 is a spring receiver, 21 is a plug B
Is.

Next, the operation will be described. When no current flows through the coil 15, the spring 19 moves the movable iron core 14 to the position shown in FIG.
Since the valve body 11 is biased downward, the valve body 11 is fully opened. When the current of the coil 15 is increased, an attractive force acts between the fixed iron core 16 and the movable iron core 14, and the movable iron core 14 moves to a position where it is balanced with the spring 19. Ie coil 1
The opening degree of the valve element 11 can be adjusted steplessly depending on the magnitude of the current of 5. At this time, the adjustability is better when the increase in the flow rate with respect to the current of the coil 15 is at a constant rate as shown by the line A in FIG. However, normally, when the valve body 11 starts to open, the rate of change of the flow rate with respect to the displacement is large, and the characteristic is as shown by the line B in FIG. FIG. 3 shows a spring 1 according to the first embodiment of the present invention.
9 is an enlarged view of FIG. 9, in which the winding pitch of the coil of the spring 19 is not constant but constitutes a coarse and dense portion. Therefore, the spring 1
Regarding the characteristics of displacement and load of No. 9, when the winding pitch is constant, it is almost straight as shown by line A in FIG. 4, whereas when the winding pitch is changed, the displacement is small as shown by line B. Sometimes, the spring constant becomes small and the displacement becomes large, the spring constant becomes large. By incorporating the spring constant of the spring 19, it is possible to obtain the characteristic or the characteristic close to the characteristic of the line A in FIG. The non-linear characteristic of the spring 19 can also be achieved by gradually changing the diameter of the coil of the spring or by gradually changing the wire diameter of the material. If the shape of not only the spring 19 but also the valve body 11 is made non-linear, desired characteristics can be obtained more easily.

FIG. 5 shows a second embodiment of the present invention, in which a second spring (second elastic body) 22 different from the first spring (first elastic body) 19 for urging the valve body 11 is provided. The second spring 22
Does not work when the valve body 11 is fully opened. Therefore, when the valve body 11 starts to be closed from the fully open state, only the first spring 19 is operating, so the spring constant is relatively small, and the valve body 11
Is displaced and the second spring 22 also acts in the vicinity where the valve body 11 is closed, and since two springs act, the spring constant increases. The displacement and load characteristics of the spring at this time are as shown in FIG.

FIG. 7 shows a third embodiment of the present invention, in which a heat exchanger 24 heated by a heater 23 such as a burner and a bypass 25 for bypassing the heat exchanger 24 are mixed downstream of a mixing section 26. A hot water outlet temperature detector 27 such as a thermistor is provided. A valve body 11 driven by the electromagnetic force generating means 9 is provided in a part of the bypass passage 25, and the bypass flow rate is controlled by a signal from the hot water outlet temperature detector 27. 28 is a heat exchanger 24
A water amount detector for detecting the amount of water, 29 and 30 are an inlet water temperature detector and a heat exchange hot water temperature detector, and 31 is a water amount control valve.

Next, the operation will be described. Before the water supply is started, the incoming water temperature detector 29 and the heat exchange hot water temperature detector 30
Signal, the current of the electromagnetic force generating means 9 is adjusted so that the mixing ratio becomes equal to the set temperature, and the valve body 11 is opened to a predetermined opening degree. When the water flow is started, the water flow detector 28 detects the water flow, and the heater 23 starts heating the heat exchanger 24. When the hot water temperature of the heat exchanger 24 rises, the hot water temperature in the mixing section 26 also rises, and the hot water temperature detector 27 detects the hot water temperature,
The temperature of the mixed hot water is compared with the set temperature, and if the temperature of the mixed hot water is low, the current of the electromagnetic force generating means 9 is increased to displace the valve body 11 in the upward direction to decrease the flow rate of the bypass and to raise the mixed hot water temperature. Increase. If the temperature of the mixed hot water is high, the electromagnetic force generating means 9 is controlled in reverse.

As described above, according to the embodiment of the present invention, the following effects can be obtained. (1) A movable iron core mounted integrally with the valve body, an electromagnetic force generating means for applying an electromagnetic force to the movable iron core, and a spring constant that increases with displacement in opposition to the operating force of the electromagnetic force generating means. Since the elastic body is provided, the change of the flow rate with respect to the current of the electromagnetic force generating means can be made linear, the sensitivity is constant, the controllability of the flow rate is good, and the stability and reproducibility of the flow rate with respect to the current value are high.

(2) A first elastic body that constantly acts on the valve body,
Since the valve body is provided with the second elastic body that operates at a position displaced by a predetermined amount, the change in the flow rate with respect to the current value can be made linear by a simple configuration, and the spring constant can be changed by combining the two elastic bodies. It is highly versatile and can be changed arbitrarily and easily.

(3) Since the first elastic body that constantly urges the valve body in the opening direction and the second elastic body that urges only near the valve body are closed, the controllability particularly near the valve body is provided. Can be increased.

(4) A bypass path bypassing the heat exchanger,
The valve element provided in the bypass passage, the hot water outlet temperature detecting means provided in the mixing portion of the bypass passage and the heat exchanger, the electromagnetic force generating means for driving the valve element, and the displacement against the electromagnetic force generating means. With an elastic body whose spring constant increases with it,
It is possible to reduce transitional changes in hot water temperature such as when hot water is started up or when hot water is again discharged, and it is comfortable when using a shower.

[0020]

As described above, according to the hot water supply control device of the present invention, the following effects can be obtained.

(1) A movable iron core integrally attached to the valve body, electromagnetic force generating means for applying an electromagnetic force to the movable iron core,
Since an elastic body whose spring constant increases with displacement in opposition to the operating force of the electromagnetic force generating means is provided, the change in the flow rate with respect to the current of the electromagnetic force generating means can be made linear and the sensitivity becomes constant. Good controllability of flow rate, and high stability and reproducibility of flow rate against current value.

(2) a first elastic body that constantly acts on the valve body,
Since the valve body is provided with the second elastic body that operates at a position displaced by a predetermined amount, the change in the flow rate with respect to the current value can be made linear by a simple configuration, and the spring constant can be changed by combining the two elastic bodies. It is highly versatile and can be changed arbitrarily and easily.

(3) Since the first elastic body that constantly urges the valve body in the opening direction and the second elastic body that urges only near the valve body are closed, the controllability particularly near the valve body is provided. Can be increased.

(4) A bypass path bypassing the heat exchanger,
The valve element provided in the bypass passage, the hot water outlet temperature detecting means provided in the mixing portion of the bypass passage and the heat exchanger, the electromagnetic force generating means for driving the valve element, and the displacement against the electromagnetic force generating means. With an elastic body whose spring constant increases with it,
It is possible to reduce transitional changes in hot water temperature such as when hot water is started up or when hot water is again discharged, and it is comfortable when using a shower.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a solenoid valve device according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram of the flow rate with respect to the current of the device.

FIG. 3 is an enlarged configuration diagram of main parts of the device.

FIG. 4 is a characteristic diagram of an elastic body of the device.

FIG. 5 is an enlarged configuration diagram of a main part of a solenoid valve device according to a second embodiment of the present invention.

FIG. 6 is an enlarged configuration diagram of main parts of the device.

FIG. 7 is a configuration diagram of a solenoid valve device of a hot water supply control device according to a third embodiment of the present invention.

FIG. 8 is a sectional view of a conventional solenoid valve device.

[Explanation of symbols]

 9 Electromagnetic Force Generating Means 11 Valve Body 14 Movable Iron Core 19 Elastic Body (First Elastic Body) 22 Second Elastic Body 24 Heat Exchanger 25 Bypass Path

Claims (4)

[Claims] 1. A valve body, a movable iron core integrally attached to the valve body, electromagnetic force generating means for applying an electromagnetic force to the movable iron core, and displacement against the operating force of the electromagnetic force generating means. An electromagnetic valve device having an elastic body whose spring constant increases in accordance with the above. 2. The electromagnetic valve device according to claim 1, further comprising a first elastic body that constantly acts on the valve body, and a second elastic body that acts at a position where the valve body is displaced by a predetermined amount. 3. The electromagnetic valve device according to claim 2, wherein the second elastic body urges only in the vicinity of the closing of the valve body. 4. A heat exchanger, a bypass passage bypassing the heat exchanger, a valve element provided in the bypass passage, and a hot water outlet temperature detection provided in a mixing portion of the bypass passage and the heat exchanger. An electromagnetic valve device of a hot water supply control device, comprising: a container, an electromagnetic force generating unit that drives the valve body, and an elastic body that opposes the electromagnetic force generating unit and whose spring constant increases with displacement.