KR20050011653A - Switching Valve - Google Patents

Abstract

PURPOSE: A switch valve is provided to improve sealing efficiency by closing firmly a pair of outlet ports by each valve body and to control finely the opening and closing of the outlet ports by regulating a rotary motion of a rotor by pulse current. CONSTITUTION: A switch valve(1) is composed of a valve basic body(2) comprising a valve chamber(6) with a plane bottom unit(11), an inlet port(15) communicating with the valve chamber, and a plurality of outlet ports(16) opened at the bottom unit of the valve chamber; a driving unit having a rotor(36) installed rotatively in the valve chamber and rotating the rotor; and a plurality of valve bodies(53) attached on the rotor and arranged separately from each other with corresponding to the outlet port. Each valve body surface-contacts with the bottom unit of the valve chamber with applying power toward the bottom unit and slides on the bottom unit by the rotary motion of the rotor to change an opening and closing of each outlet port.

Description

Switching Valve

The present invention relates to a switching valve having a valve body having a valve chamber.

Conventionally, as this type of switching valve, an inlet opening and a pair of outlet openings are formed in a valve body having a valve chamber, and a ball valve body is attached to a lower end of a rotor of a motor located in the valve chamber. Moreover, the structure by which the ball valve body changes the opening / closing state of a pair of outlet port by the rotational movement of a rotor is known (for example, refer patent document 1).

In addition, the valve body provided with the valve chamber is formed with an inlet port connected to the valve chamber and a pair of outlet ports opened at the bottom surface of the valve chamber, and is substantially concave in plan view at the lower end of the rotor of the motor located in the valve chamber. One valve main body is provided, and the structure which changes the opening-and-closing state of a pair of outlet opening respectively by the rotational movement of a rotor is also known (for example, refer patent document 2).

[Patent Document 1]

Japanese Patent Laid-Open No. 2001-116152 (pages 4-12, Fig. 1)

[Patent Document 2]

Japanese Patent Application Laid-Open No. 2002-122366 (pages 6-9, FIGS. 2-6)

However, in the switching valve described in Patent Document 1, the lower end portion of the ball valve body is positioned slightly below the bottom of the valve chamber in order to close the outlet port securely. Therefore, when the rotor is rotated in the valve chamber, the ball The valve body may have a problem that the bottom of the valve chamber may be damaged or stick to the outlet, and the durability and liquid tightness may not be easily improved due to wear of the bottom of the valve chamber.

In addition, in the switching valve described in Patent Document 2, the pair of outlets are closed by one valve body, so that liquid leaks from both outlets at once, such as when the valve body shakes with the valve chamber. There exists a possibility that it may arise, and there exists a problem that it is not easy to improve liquid tightness.

This invention is made | formed in view of this point, Comprising: It aims at providing the switching valve which improved durability and liquid tightness.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal side view which shows one Embodiment of the switching valve of this invention.

Figure 2 is a cross-sectional view A-A of Figure 1 showing the valve body of the same switching valve as described above.

3 is a cross-sectional view taken along line B-B of FIG. 1 showing the valve body of the same switching valve as described above.

4 is a cross-sectional view taken along line B-B of FIG. 1 showing the rotational movement state of the rotor of the same switching valve as described above.

5 is a cross-sectional view taken along line B-B of FIG. 1 showing another rotational motion of the rotor of the same switching valve as described above.

6 is a cross-sectional view taken along line B-B of FIG. 1 showing still another rotational motion of the rotor of the same switching valve as described above.

7 is a cross-sectional view taken along line B-B of FIG. 1 showing still another rotational motion of the rotor of the same switching valve as described above.

<Description of the symbols for the main parts of the drawings>

1: Electric valve as switching valve 2: Valve body

3: Stepping motor as drive part 6: Valve chamber

11: valve chamber bottom part as bottom part 15: inlet port

16: first outlet as outlet 17: second outlet as outlet

36: rotor as rotor

53: first valve body as a valve body

54: second valve body as the valve body

The switching valve according to claim 1 comprises a valve body having a valve chamber having a flat bottom surface portion, an inlet port connected to the valve chamber, and a plurality of outlet ports opened in the bottom surface portion of the valve chamber, and rotating in the valve chamber. A rotor rotatably provided, and a driving unit for rotating the rotor, and a plurality of valve bodies respectively attached to the rotor and separately installed corresponding to the outlets, wherein each valve body And contacting the bottom surface with the force applied toward the bottom surface of the valve chamber, and sliding the upper surface of the valve chamber by the rotational movement of the rotor to control the opening and closing of each outlet. To change.

Then, in the state where a force is applied toward the bottom of the valve chamber, a plurality of valve bodies which are in surface contact with the bottom portion are attached to the rotor of the driving unit, respectively, and these valve bodies are placed on the bottom surface by the rotational movement of the rotor. Since the sliding operation changes the opening and closing state of each of the plurality of outlets opened in the bottom portion of the valve chamber, the valve body is prevented from damaging the bottom portion of the valve chamber and the durability is improved. A plurality of outlets can be reliably closed by the valve body, respectively, and the liquid-tightness improves.

The switching valve of Claim 2 is a switching valve of Claim 1, Comprising: The drive part is a stepping motor.

By using the driving unit as a stepping motor, the rotational movement of the rotor can be finely adjusted, and thus the plurality of outlet opening and closing states can be finely adjusted.

According to the switching valve according to claim 1, in the state where a force is applied toward the bottom face of the valve chamber, a plurality of valve bodies contacting the bottom face is attached to the rotor of the drive unit, and these valve bodies rotate the rotor. By sliding the bottom part by the movement to change the opening / closing state of each of the plurality of outlets opened in the bottom part of the valve chamber, the valve body can be prevented from damaging the bottom part of the valve chamber to improve durability. At the same time, it is possible to reliably close the plurality of outlets by the valve bodies provided separately from each other, thereby improving liquid tightness.

According to the switching valve according to claim 2, since the rotational movement of the rotor can be finely adjusted by using the driving unit as a stepping motor, the opening and closing states of the plurality of outlets can be finely adjusted.

[Inventive Embodiment]

EMBODIMENT OF THE INVENTION Hereinafter, the structure of one Embodiment of the switching valve which concerns on this invention is demonstrated with reference to drawings.

As shown in Figs. 1 to 7, reference numeral 1 denotes an electric switching valve as a switching valve, that is, an electric valve. This electric valve 1 is provided with the valve main body 2 and the stepping motor 3 as a drive part attached to this valve main body 2. As shown in FIG.

As shown in FIG. 1, the valve body 2 is provided in a lower case 4 and a cap shape, and an upper case 5 fixedly attached to an upper portion of the lower case 4 in a liquid tight state. Have Therefore, the valve chamber 6 which is a liquid-tight space is formed between the lower case 4 and the upper case 5 of the valve body 2.

The lower case 4 is formed in a substantially cylindrical shape, and the upper end portion is a planar valve chamber bottom portion 11 as a bottom portion of the valve chamber 6. The flange part 12 is press-fitted in the periphery of this valve chamber bottom face part 11, and is integrated. This flange portion 12 protrudes from the lower case 4 in the upward direction and the radial direction, and is fixed in close contact with the upper flange portion 13 formed integrally with the lower end portion of the upper case 5.

In addition, the valve chamber bottom surface 11 of the lower case 4 penetrates through the lower case 4 in the vertical direction, so that an inlet 15, a first outlet 16 as an outlet, and a second outlet 17 as an outlet are provided. ) Is formed. Therefore, these inlet ports 15 and the pair of outlet ports 16 and 17 communicate with the outside of the valve chamber 6 and the valve body 2.

As shown in FIGS. 2 to 7, the inlet 15 is provided at a position spaced in the radial direction from the center in the planar view of the lower case 4, and has a larger diameter than the outlets 16 and 17. have. In addition, an inlet pipe 21 through which a fluid not shown is introduced is connected to the lower portion of the inlet port 15 through one another.

The first outlet 16 is formed at a position opposite to the inlet 15 along the radial direction of the lower case 4 with respect to the center in a plan view of the lower case 4. Accordingly, the center of the first outlet 16 and the center of the inlet 15 are located on the center line passing through the center in the plan view of the lower case 4. Further, the first outlet 16 is formed at a position where the distance from the center of the lower case 4 is shorter than the distance from the center of the inlet 15 in the plane of the lower case 4. In other words, the first outlet 16 is formed at a position closer to the center of the lower case 4 than in the inlet 15.

The second outlet 17 is formed in substantially the same shape as the first outlet 16. In other words, the second outlet 17 has the same diameter dimension as the first outlet 16. Moreover, as shown in FIG. 2, the 2nd outlet 17 is located concentrically with the 1st outlet 16 with respect to the center in plan view of the lower case 4. As shown in FIG. In addition, as shown in FIGS. 2 to 7, the second outlet 17 has the first outlet 16 viewed from the bottom of the lower case 4 at about 90 ° with respect to the center, and shown below in FIG. 2. , Spaced apart along the circumferential direction. Therefore, the center line passing through the center of the lower case 4 and the center of the first outlet 16, and the center line passing through the center of the lower case 4 and the center of the second outlet 17 are, They are approximately orthogonal to each other.

The outlet pipes 22 through which the fluid flows out are connected to the lower parts of the outlet ports 16 and 17, respectively.

In the valve chamber bottom face 11 of the lower case 4, a substantially cylindrical stopper 24 which restricts the rotational movement position of the stepping motor 3 protrudes along the vertical upward direction. The stopper 24 is opposite to the second inlet port 17, ie, the upper part shown in FIG. 2 with respect to the center line in a plan view of the lower case 4 passing through the center of the inlet port 15 and the first outlet port 16. Is installed in position. The stopper 24 is provided at a position closer to the outer circumference of the lower case 4 than the inlet 15. And the stopper 24 is provided so that a center line may pass through the position of the middle of the outlet openings 16 and 17 by planar view of the lower case 4 which passes through a center axis.

On the other hand, as shown in FIG. 1, the upper case 5 is provided in circular cap shape, and is fixedly attached to this lower case 4 in the state which made the lower case 4 and the central axis coincide. Moreover, the upper flange part 13 which protruded in the radial direction is integrally formed in the lower end part of the upper case 5. As shown in FIG. In addition, a circular upper fitting recess 31 is recessed upwardly in the central region in the plan view of the upper end of the upper case 5. The upper end of the rotating shaft 32 of the stepping motor 3 is inserted into the upper fitting recess 31. The rotary shaft 32 is provided along the central axis of the upper case 5, that is, the central axis of the valve body 2, and is provided in the center of the valve chamber bottom 11 of the lower case 4 in a plan view. The lower end is inserted into the recessed fitting recess 33. As a result, the rotating shaft 32 is axially supported in the valve chamber 6 so as to be rotatable along the circumferential direction.

The stepping motor 3 is a cylindrical stator 35 provided along the outer circumference of the upper case 5 of the valve body 2 and a rotor as a rotor provided rotatably on the inner circumference of the stator 35. (36) is provided.

The stator 35 has the coil part 43 which wound the lead wire 42 in the iron core 41 formed in the coil bobbin shape coaxial with the valve body 2. These coil parts 43 are electrically connected to a control circuit not shown. Then, the stepping motor 3 finely controls the rotational movement angle of the rotor 36 by transmitting a pulse current to these coil units 43 in a control circuit not shown.

In addition, the rotor 36 is formed of a magnet and is housed in the upper case 5 so as to be rotatable as shown in FIGS. 1 and 3 and the like. That is, the rotor 36 is installed in the valve chamber 6 so as to be rotatable. This rotor 36 has a substantially cylindrical main body portion 45 having a central axis coinciding with the central axis of the upper case 5, and a protrusion 46 formed integrally with the main body portion 45.

In the main body portion 45, the rotation shaft 32 is fitted through the central axis. In addition, the main body portion 45 has an outside diameter dimension passing through the center of the inlet port 15 in plan view. Therefore, the main body 45 has an outer circumferential portion outside the outlets 16 and 17 in plan view.

The protrusion part 46 protrudes radially from the main body part 45 in plan view, and is formed from the outer peripheral part of the main body part 45 about 180 degrees along the outer peripheral edge of the main body part 45. . The protruding portion 46 has an outer circumferential edge formed in an arc shape with the center axis of the rotor 36 as the center, and extends around the inner circumferential wall of the valve chamber 6. At both ends of the protruding portion 46, the first contact portion 47 and the second contact portion 48 are formed to contact the side portions of the stopper 24 by the rotational movement of the rotor 36.

Further, the first fitting hole 51 and the second fitting hole 52 in a circular shape are drilled in the lower end of the main body 45. These fitting hole portions 51 and 52 are formed continuously in the vicinity of the central region in the vertical direction of the main body portion 45 at the lower end of the main body portion 45.

The fitting hole portions 51 and 52 are located on the circumference passing through the center of the outlet openings 16 and 17 as the center when viewed in the plane of the main body portion 45, that is, the center when viewed in the plane of the lower case 4. In other words, the fitting hole portions 51 and 52 are formed at the positions corresponding to the outlet openings 16 and 17 in plan view.

The first fitting hole 51 is formed at a position close to the first contact portion 47, and the second fitting hole portion 52 is formed at a position close to the second contact portion 48. In addition, these fitting hole parts 51 and 52 are formed in the position spaced about 90 degrees with respect to the center with respect to the center in plan view of the lower case 4. As shown in FIG.

The first valve body 53 and the second valve body 54 serving as valve bodies are inserted into the lower ends of the fitting hole portions 51 and 52, respectively.

The valve bodies 53 and 54 are formed integrally with a cylindrical shaft portion 55 having an outer diameter approximately equal to the diameter dimension of the fitting hole portions 51 and 52, and a closed portion formed integrally with the lower ends of these shaft portions 55. Each part 56 is provided.

The shaft portion 55 is formed to have a smaller shaft size than the fitting hole portions 51 and 52, and the coil spring 57 as a means for applying force is in contact with the upper end of the shaft portion 55. The coil spring 57 is located between the upper end portion of the fitting hole portions 51 and 52 and the upper end portion of the shaft portion 55 so that the valve bodies 53 and 54 have a valve chamber bottom surface portion of the valve chamber 6 ( 11) The force is being exerted on.

The closing portion 56 is formed with a diameter larger than the shaft portion 55 and the outlet openings 16 and 17 by changing the opening and closing state of the outlet openings 16 and 17 by the rotational movement of the rotor 36. In other words, the closing portion 56 has a shape that cannot be inserted into the fitting hole portions 51 and 52. In addition, the outside diameter dimension of the closing part 56 of each valve body 53 and 54 is sized so that at least one part of outflow opening 16 and 17 cannot be closed simultaneously. In other words, each of the valve bodies 53 and 54 does not contact any of the outlets 16 and 17 in a state in which the closing portion 56 closes at least part of any one of the outlets 16 and 17. Moreover, the lower end surface is formed in planar shape, and this closure part 56 is in surface contact with the valve chamber bottom face 11. As shown in FIG. For this reason, the closing part 56 of the valve main bodies 53 and 54 makes sliding contact with the valve chamber bottom part 11 by the rotational motion of the rotor 36. As shown in FIG.

Next, the operation of the above embodiment will be described.

Hereinafter, the state shown in FIG. 3, ie, the state which the 1st contact part 47 is in contact with the stopper 24, is demonstrated as an initial state. As shown in FIG. 3, in the initial state, that is, in the state where the number of pulses is zero, the second valve body 54 completely closes the first outlet port 16, that is, it is completely closed, and the second outlet port ( 17) is fully open.

In this state, when a pulse current is transmitted to the coil part 43 of the stepping motor 3, as shown in FIG. 4, when the rotor 36 is planar view centering on the rotating shaft 32, it will rotate clockwise. In rotational motion, the second valve body 54 is shifted in the clockwise direction from the first outlet port 16, and the opening state of the first outlet port 16 changes. The state shown in FIG. 4 is a state where the number of pulses is 10, for example, and the rotor 36 rotates about 45 degrees from an initial state, and all the outlet ports 16 and 17 are all open.

Subsequently, when the pulse current is further transmitted to the stepping motor 3, as shown in FIG. 5, the rotor 36 rotates in the clockwise direction in a plan view with respect to the rotation shaft 32, and the first valve body. 53 changes the open / close state of the second outlet 17, and the second valve body 54 changes the open / close state of the first outlet 16, respectively. The state shown in FIG. 5 is a state of 20 pulses, for example, and the rotor 36 rotates about 90 degrees from an initial state, and the outlet openings 16 and 17 are all closed.

In addition, when a pulse current is transmitted to the stepping motor 3, as shown in FIG. 6, the rotor 36 rotates clockwise in a planar view about the rotation shaft 32, and the first valve body ( 53 is shifted from the second outlet 17, and the second valve body 54 is shifted from the first outlet 16, respectively, to change the opening and closing states of the outlets 16 and 17, respectively. The state shown in FIG. 6 is a state where the number of pulses is 30, for example, and the rotor 36 rotates about 135 degrees from the initial state, and the outflow openings 16 and 17 are all opened.

When the pulse current is transmitted to the stepping motor 3, as shown in FIG. 7, the rotor 36 rotates in the clockwise direction in a plan view with the rotation axis 32 as the center, so that the first valve body ( 53 changes the opening state of the second outlet 17. In the state shown in FIG. 7, for example, the number of pulses is 40, the rotor 36 rotates about 180 ° from the initial state, the second contact portion 48 contacts the stopper 24, and the first outlet ( 16 is fully open, and the second outlet 17 is fully closed.

Moreover, in the state between each of the states shown in FIGS. 3-7, the opening / closing state of the outlet openings 16 and 17 with respect to the rotation angle of the rotor 36 is substantially linear between the states shown in each figure. It is changing.

When the pulse current is transmitted to the stepping motor 3 in the reverse order, the rotor 36 rotates counterclockwise until the first contact portion 47 comes into contact with the stopper 24.

As described above, in the above-described embodiment, the pair of valve bodies 53 which are in surface contact with the valve chamber bottom face 11 in a state where a force is applied toward the valve chamber bottom face 11 of the valve chamber 6. And 54 are attached to the rotor 36 of the stepping motor 3, respectively, so that the valve bodies 53 and 54 slide on the valve chamber bottom 11 by the rotational movement of the rotor 36. The opening and closing states of the pair of outlets 16 and 17 were changed.

For this reason, compared with the case where the valve body is made into the ball valve etc., the valve body 53, 54 suppresses damage to the valve chamber bottom part 11 of the valve chamber 6, etc., and can improve durability. At the same time, as compared with the case where the valve body is integrally installed, it is easy to reliably close the pair of outlet ports 16 and 17 as the valve bodies 53 and 54 provided separately from each other. , The liquid-tightness can be improved.

In addition, by using the valve bodies 53 and 54 as the coil springs 57 to apply a downward force, the manufacturability of manufacturing cost can be reduced.

Further, by using the driving unit as the stepping motor 3, the rotational movement of the rotor 36 can be finely adjusted as a pulse current, so that the opening and closing states of the pair of outlets 16 and 17 can be finely adjusted.

Then, by providing a stopper 24 for regulating the rotational movement angle of the rotor 36, for example, when the stepping motor 3 or the like is damaged, the rotor 36 rotates more than necessary and the electric valve 1 The damage to the inside can also be reliably prevented.

Moreover, in the said one Embodiment, if the drive part can rotate the rotor 36 at a desired angle, the structure other than the stepping motor 3 is also possible.

In addition, three or more outlet ports may be provided in the valve chamber bottom face 11 through the valve chamber 6. In this case, the valve body is attached to the rotor 36 in a number corresponding to the outlet.

In addition, the rotation angle per unit pulse of the stepping motor 3 can also be other than the said structure.

Claims (2)

A valve body having a valve chamber having a flat bottom surface portion, an inlet port connected to the valve chamber, and a plurality of outlet openings opened in the bottom surface portion of the valve chamber; A drive unit provided with a rotor rotatably installed in the valve chamber, the drive unit rotating the rotor; A plurality of valve bodies respectively attached to the rotors and installed separately from each other in correspondence with the outlets; Each valve body is in surface contact with the bottom face in a state in which a force is applied toward the bottom face of the valve chamber, and the bottom body of the valve chamber is slid by the rotational movement of the rotor. Switch valve, characterized in that for changing the open and closed state. The switching valve according to claim 1, wherein the driving unit is a stepping motor.