JP3006267B2 - Flow control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control device for mainly controlling the flow rate of water or hot water.

[0002]

2. Description of the Related Art Conventionally, this type of flow control apparatus is based on a DC solenoid valve that performs only opening and closing, and adjusts a valve opening by changing an applied current value. In FIG. 2, a coil assembly 3 having a bobbin 1 and a coil 2 is fixed to a valve housing 5 by a yoke 4. The valve housing 5 has an inflow passage 6 and an outflow passage 7, and a valve seat 8 is provided at an intermediate portion thereof, and a valve body 9 is disposed in the valve seat 8. One end of the plunger 10 slidably inserted in the axial direction of the bobbin 1 is connected to the valve body 9, and a fixed iron core 11 for adsorbing the plunger 10 is provided on the opposite side of the bobbin 1 from the valve body 9. I have. As shown in FIG. 2, when the coil 9 is energized from the position where the valve element 9 closes the valve seat 8 and the plunger 10 is attracted to the fixed iron core 11, the valve element 9 separates from the valve seat 8 and opens. In addition,
A spring 12 presses the valve body 9 toward the valve seat 8.

[0003]

With the above configuration, when the operation is performed for the first time, vibration is easily generated when the flow rate is reduced due to the influence of air interposed between the plunger 10 and the fixed iron core 11 in the air 9. When the plunger 10 and the fixed iron core 11 are in close contact with each other when fully opened, even if the current is decreased, once the contact is made, the attraction force is large and the plunger 10 cannot be separated from the fixed iron core 11. The controllability of stopping down was poor.

An object of the present invention is to solve such a problem and to provide a flow control device having a high controllability and a stable flow rate.

[0005]

In order to achieve the above object, a flow control device according to the present invention comprises a coil assembly having a bobbin and a coil, a pipe provided at an axis of the bobbin, A plunger that is inserted as possible, a fixed core disposed in one end of the bobbin in the axial direction to adsorb the plunger, a non-magnetic spacer provided between the plunger and the fixed core, an inflow passage and an outflow passage. A valve housing having a passage, a control valve provided in the valve housing, and adjusting a flow rate in conjunction with the plunger; an urging means for urging the control valve in a closing direction; changing the energization amount, the predetermined time when power is turned on or used at the start to control the flow rate by adjusting the valve opening degree of the control valve top
Apply a large current to the coil to fix the plunger, spacer,
It consists of a controller that makes the fixed iron core adhere .

[0006]

With the above arrangement, when the controller applies a constant amount of current to the coil, the valve opening is set at a position where the attraction force of the plunger, the urging force of the urging means, and the load received by the control valve from the fluid are balanced. Is determined, and the controller controls the valve opening degree of the control valve by changing the amount of current supplied to the coil to control the flow rate.
When the amount of current to the coil is sufficiently increased, the plunger and the spacer and the fixed iron core come into close contact with each other. However, since the spacer is a non-magnetic material, if the amount of current is reduced slightly from the close contact, the plunger will operate and control. Adjust the valve opening.

When the power is turned on or at the start of use, the controller supplies a maximum current to the coil for a predetermined time to control the plunger, the spacer, and the fixed iron core to be in close contact with each other. Is to be eliminated.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a flow control device according to one embodiment of the present invention. As shown in FIG. 1, the inflow channel 13 and the outflow channel 1
4, a conical control valve body 16 for adjusting the flow rate, and a corresponding valve seat 17 are provided in the valve housing 15. In order to balance the primary pressure of the fluid with the control valve body 16, a grooved diaphragm 18 as a flexible pressure receiving body is connected between the control valve body 16 and the valve housing 15,
The groove 18a is further deepened so that the effective pressure receiving area is always equal to the diameter of the valve seat 17 regardless of the lift amount of the control valve body 16. 1 with diaphragm 18
A back pressure chamber 19 completely separated from the next side and the control valve body 16
Is communicated with the secondary side through a communication hole 20.

The control valve element 16 is urged by a spring 22 as urging means 21 in a direction in which it comes into contact with the valve seat 17. Also, a coil assembly 25 having a bobbin 23 and a coil 24, and a pipe 26 provided at the axis of the bobbin 23, and a plunger 27 is slidably inserted into the pipe 26. A fixed iron core 28 is disposed at one end of the bobbin 23 in the axial direction, and a non-magnetic spacer 29 is provided between the plunger 27 and the fixed iron core 28. Plunger 27, fixed iron core 28 and spacer 2
9 have tapered concavities and convexities, but their angles and diameters are uniform, and there is no gap for air to accumulate when they come into close contact. The plunger 27 is connected to the control valve body 16. The controller 30 operates the control valve body 16 via the plunger 27 by changing the amount of current supplied to the coil 24, and controls the valve opening of the control valve to control the flow rate. At the start, a maximum current is applied to the coil 24 for a few seconds to control the plunger 27 to come into close contact with the spacer 29 and the fixed core 28, thereby completely eliminating air between the plunger 27 and the fixed core 28.

In the above configuration, the controller 30 adjusts the flow rate by controlling the amount of current supplied to the coil 24.
To set the flow rate to 0 (stop), the controller 30
By turning off the power to the control valve body 16 urged by the spring 22, the control valve body 16 comes into contact with the valve seat 17 and the fluid stops flowing. When the coil 24 is energized, the plunger 27 is attracted, and the control valve body 16 is opposed to the urging force of the spring 22.
And the fluid begins to flow. That is, the controller 30
Is to adjust the control valve body 16 to an arbitrary lift amount and control the flow rate by changing the amount of current supplied to the coil 24.

According to this embodiment, when the energization amount to the coil 24 is sufficiently increased when the valve opening is maximized, the plunger 27 and the spacer 29 and the fixed iron core 28 come into close contact with each other. Is a non-magnetic material, the attraction force between the plunger 27 and the fixed iron core 28 does not suddenly increase as in the case of direct contact, and if the amount of electricity supplied at the time of close contact is slightly reduced, the plunger 27 becomes As a result, the valve opening of the control valve body 16 can be adjusted, and the controllability is high.

The controller 30 supplies a maximum current to the coil 24 for a few seconds when the power is turned on or when starting to use or after draining water to prevent freezing.
9 and the fixed iron core 28 are tightly controlled.
When water flows for the first time after construction, when the maximum current is applied to the coil 24, there is no fluid such as water around the control valve body 16 and there is no load received from the fluid. That is, the suction force of the plunger 27 is sufficiently superior, the suction is instantaneously performed, and the control valve body 16 is opened. When the water comes, the control valve body 16 starts receiving a load in the direction of squeezing from the fluid. After a few seconds and lowering the current value,
The plunger 27 is separated from the spacer 29 and the fixed iron core 28 by the balance of each load, but water is interposed in the space and there is no air. That is, the air between the plunger 27 and the fixed iron core 28 is completely eliminated. That is, if air is interposed in the space between the plunger 27 and the fixed iron core 28, this air becomes a new urging means, and the relationship between the control current value and the flow rate is not determined, or when the flow rate is reduced under high water pressure. This has the effect of eliminating problems such as easy vibration. Further, if the spacer 29 is made of a non-magnetic rubber, the impact sound generated when the plunger 27 is attracted can be absorbed.

[0013]

As is clear from the above description of the embodiment, according to the flow control device of the present invention, the following effects can be obtained. Non-magnetic spacer between plunger and fixed core
Power-on or start-up for a specified period of time.
The plunger is fixed iron because the current flows through the coil.
Plunger and fixed iron without adsorbing directly to the heart
The gas between the heart can be completely eliminated, and the gas is interposed.
Vibration and deterioration of control performance can be prevented beforehand.
You.

[Brief description of the drawings]

FIG. 1 is a sectional view of a flow control device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional flow control device.

[Explanation of symbols]

 Reference Signs List 13 inflow path 14 outflow path 15 valve housing 16 control valve element 21 biasing means 23 bobbin 24 coil 25 coil assembly 26 pipe 27 plunger 28 fixed iron core 29 spacer 30 controller

──────────────────────────────────────────────────続 き Continuing the front page (72) Inventor Bunichi Shiba 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References Japanese Utility Model Sho 64-29811 (JP, U) Japanese Utility Model Hei 4 −86910 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 31/06 340 F16K 31/06 305

Claims (1)

(57) [Claims] 1. A coil assembly having a bobbin and a coil, a pipe provided at an axial center of the bobbin, a plunger slidably inserted into the pipe, and one end of the bobbin in the axial direction thereof. A fixed iron core for adsorbing the plunger, a non-magnetic spacer provided between the plunger and the fixed iron core, a valve housing having an inflow passage and an outflow passage, and provided in the valve housing and interlocked with the plunger. A control valve for adjusting the flow rate, a biasing means for biasing the control valve in a closing direction, and changing the amount of current supplied to the coil to adjust the valve opening of the control valve to control the flow rate. Power supply
The maximum current is supplied to the coil for a predetermined time at the time of turning on or starting use.
Energize to bring the plunger into close contact with the spacer and fixed iron core.
That controls the flow control device comprising a.