JP3033320B2 - Two-fluid control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention has two inflow ports,
The present invention relates to a fluid control valve for hot water having one outlet port.

[0002]

2. Description of the Related Art Conventionally, there has been a fluid control valve of this type as shown in FIG. There are a first inflow port 2, a second inflow port 3, and one outflow port 1. By rotating the motor 4 forward and backward, the ball valve 6 is rotated via the connection shaft 5, and the opening of the ball valve 6 is opened. The two kinds of fluids are controlled by adjusting the position of 6a to the two inflow ports 2 and 3, and a Teflon valve seat 7 is sandwiched from both sides of the two inflow ports 2 and 3 as a valve seat for the ball valve 6. It is configured to maintain airtightness by being tightened and connected to the shaft.

[0003]

However, the valve seat 7 has
Is a synthetic resin such as Teflon, so it expands with warm water,
Swelling is remarkable, the rotational resistance of the ball valve 6 increases, and there is a possibility that the motor 4 cannot be driven. Also, durably,
The airtightness was reduced due to abrasion, hardening, etc. of the valve seat 7, and water stoppage was likely to be poor.

An object of the present invention is to solve such a problem and to provide a fluid control valve which is durable even in hot water.

[0005]

In order to solve the above-mentioned problems, a two-fluid control valve according to the present invention comprises a first inflow path, a second inflow path, one outflow path, and the two inflow paths. A first valve seat and a first valve body, and a second valve seat and a second valve body, which are respectively provided opposite to the openings facing the outflow passage; and a valve seat corresponding to the two valve bodies. A first spring and a second spring that urge in a direction in which the two valve bodies are individually lifted by being driven in a thrust direction; and an electric drive that drives the valve shaft. It comprises a device and position detecting means for detecting the position of the valve shaft.

[0006]

With the above arrangement, the first valve element and the second valve element are independently lifted by the thrust drive of the valve shaft by the electric drive device, and the fluid flowing from the first inflow path is removed. When controlling, the first valve body changes the valve opening in conjunction with the valve shaft, and the second valve body remains in contact with the second valve seat regardless of the thrust drive of the valve shaft. is there. On the other hand, when controlling the fluid flowing from the second inflow path,
The second valve body changes the valve opening in conjunction with the valve shaft, and the first valve body remains in contact with the first valve seat regardless of the thrust drive of the valve shaft. As described above, the two types of fluids are independently controlled only by one of them. By detecting the position of the valve shaft by the position detecting means, the lift state of the two valve bodies and both valve bodies are closed. Position is detected.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a two-fluid control valve according to one embodiment of the present invention. As shown in FIG. 1, reference numeral 11 denotes a valve housing 11,
A first inflow channel 8, a second inflow channel 9, and one outflow channel 10
Having. The valve housing 11 has the first valve seat 1 inside the opening 11a facing the first inflow channel 8 to the outflow channel 10.
2 and the first valve element 13 from the second inflow path 9 to the outflow path 10
The second valve seat 14 and the second valve body 15
Are provided facing each other. Further, the valve housing 11 has the two valve bodies 13 and 15 therein corresponding to the respective valve seats 1.
A first spring 16 and a second spring 17 are provided on the first and second springs 14 to urge them from the inflow side to the outflow side and in a contacting direction. The valve shaft 18 lifts the two valve bodies 13 and 15 independently by being driven in the thrust direction, and penetrates the center of the second valve body 15 slidably. A stopper 19 for lifting the valve body 15 is provided on the valve shaft 18, and the second valve body 15 is moved by thrust driving in accordance with the movement of the stopper 19.
When the valve shaft 18 and the stopper 19 are moved in a direction to reduce the opening of the second valve body 15 and are further driven from a position where they come into contact with the second valve seat 14, the stopper 19 is adjusted. Moves away from the second valve body 15 and then the valve shaft 18
Is configured to push up and lift the first valve body 13. In order to drive the valve shaft 18 in the thrust direction, a plug 22 fixed to the valve shaft 18 and the valve housing 11 side by using a geared motor 21 as an electric driving device 20.
The geared motor 21 has a
A structure in which the thrust drive is performed while rotating the valve shaft 18 via two gears (the gear 23 on the geared motor 21 side and the gear 24 on the valve shaft 18). Has the same number of teeth, and a volume 26 as a position detecting means is directly connected to the gear 23 on the geared motor 21 side.
The rotation angle of the valve shaft 24, that is, the amount of thrust movement of the valve shaft 18 is detected, and the position detection means detects the lift state of the two valve bodies 13 and 15.

Next, the operation of the above configuration will be described. The volume 25 detects the rotation angle of the geared motor 21 side gear 23. In this embodiment, the total rotation angle of the geared motor 21 side gear 23 is 300 degrees, and the intermediate position (0 degree) is the reference point. Position and clockwise 150
In the middle position (0 degree), 5 mm is the total thrust drive width because 150 mm in the counterclockwise direction, that is, 3 mm thread having a pitch of 2 mm is used for the thread portion of the valve shaft 18. As shown in a), the first valve body 13 and the second valve body 1
5 are in contact with the corresponding first valve seat 12 and second valve seat 14, respectively, and the flow of fluid from the first inflow channel 8 and the second inflow channel 9 is stopped.

At this time, the stopper 19 of the valve shaft 18 and the second valve body 15, and the tip of the valve shaft 18 and the first valve body 13 have a slight allowance with respect to the intermediate position (0 degree). In this case, a sufficient contact force with the corresponding first and second valve seats 12 and 14 and a durable valve wear are addressed. Geared motor 21 several times clockwise from intermediate position (0 degree)
Is driven, the stopper 19 of the valve shaft 18 separates from the second valve body 15, and thereafter, the tip of the valve shaft 18 is moved to the first valve body 1.
3 is lifted and lifted, and the first fluid starts flowing from the first inflow passage 8. As shown in FIG. 2B, the position where the first valve body 13 is rotated by 150 degrees is the maximum opening degree. At that time, the second valve body 15 remains in contact with the second valve seat 14.

Further, as shown in FIG. 2C, the geared motor 21 is rotated counterclockwise several times from an intermediate position (0 degree).
Is driven, the stopper 19 of the valve shaft 18 lifts the second valve body 15 and the flow of the second fluid from the second inflow passage 9 starts. The second valve body 1 is where it has been rotated 150 degrees.
The maximum opening degree is 5. At that time, the first valve body 13 remains in contact with the first valve seat 12.

As described above, in the present embodiment, only two types of fluids are controlled independently of each other. Even if two or more microswitches are used as the position detecting means 26, the two valve bodies may be used. Although it is possible to detect the lift states of the valves 13 and 15 and the positions where both valve bodies are closed, the volume 26 is used in this embodiment, so that any valve position of the volume 26 can be adjusted by adjusting the flow rate. By storing the detected value, the re-discharge amount after stopping the flow rate can be easily controlled by keeping the valve position constant.

When the flow of both or any of the fluids is stopped, the pressure of the fluid is reduced to the first valve element 1 respectively.
First valve seat 12 corresponding to third and second valve bodies 15
Further, the sealing force is increased due to the configuration acting in the direction in which the second valve seat 14 comes into contact with the second valve seat 14.

Further, since a geared motor 21 is used as the electric drive device 20 and the rotational force of the geared motor 21 is driven in a thrust manner through a screw mechanism, the load on the geared motor 21 is reduced by the ball valve. This can be reduced compared to the case, and operation can be performed with a small motor 21.

[0014]

According to the two-fluid control valve of the present invention, the following effects can be obtained as is clear from the above description of the embodiment. (1) Only one of the two types of fluids is independently controlled, and the configuration is hardly affected by the temperature of the working fluid, so that it can be used for hot water. (2) Since the pressure of the fluid serves as the closing force of the valve as it is, the closing performance is excellent and the durability is stable. (3) Since two fluids are selectively controlled by thrust driving of the valve shaft, the driving torque can be reduced as compared with the case of a ball valve, and control can be performed with a small driving device.

[Brief description of the drawings]

FIG. 1 is a sectional view of a two-fluid control valve according to an embodiment of the present invention.

FIG. 2 (a) is a cross-sectional view of a main part when both valve bodies of the valve are closed. FIG. 2 (b) is a cross-sectional view of a main part when one valve body of the valve is opened. ) Is a sectional view of the main part when the other valve element of the valve is open.

FIG. 3 is a sectional view of a conventional fluid control valve.

[Explanation of symbols]

 Reference Signs List 8 first inflow path 9 second inflow path 10 outflow path 12 first valve seat 13 first valve body 14 second valve seat 15 second valve body 16 first spring 17 second spring 18 Valve shaft 20 Electric drive device 26 Position detecting means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 11/18

Claims (1)

(57) [Claims] 1. A first valve seat and a first valve seat provided opposite to an opening portion facing a first inflow channel, a second inflow channel, one outflow channel, and an outflow channel from the two inflow channels. A first valve body, a second valve seat, a second valve body, and a first spring that urges the two valve bodies from the inflow side to the outflow side to the corresponding valve seats in a direction in which they abut. And a second spring, a valve shaft that individually lifts the two valve bodies by driving in the thrust direction, an electric drive device that drives the valve shaft, and a position that detects the position of the valve shaft. A two-fluid control valve comprising detection means.