JPH11141706A - Rotary disc valve - Google Patents

Abstract

(57) [Summary] [Problem] At the time of valve rotation when switching a flow path,
Provided is a rotary disk valve that can rotate a valve with a small load and can operate stably for a long period without damaging a valve seat. SOLUTION: A disk valve 5 provided with a valve pressing cam 6 and a valve ascending cam 11 is rotatably provided in a valve box 3 provided with a plurality of valve holes so that a lower end thereof abuts. A slide cam 7 driven by a motor 21 having an upper cam 12 and a lower cam 8 is provided between the valve lift cam 11 and a spring 30 provided above the slide cam 7. This constitutes a rotary disc valve provided with position detecting means 34 for detecting rotation to a predetermined position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary disc valve such as an electric five-way valve or a four-way valve used for switching a cooling water circuit or a circulating water circuit.

[0002]

2. Description of the Related Art In a water circuit of a heating / cooling device using hot or cold water, a water circuit of a bath or a hot water supply device, a motor-operated multi-way valve used to switch the direction of circulation of water is connected to a plurality of flow passages. A flow path for selectively communicating an arbitrary opening is formed inside the valve seat having the number of openings,
A bowl-shaped valve body having a plurality of openings is made rotatable in a contact state, and the valve body is rotated by an electromagnetic device or a motor, so that the opening of the internal flow path of the valve body becomes the opening of the valve seat. The communication is arbitrarily performed, and the inversion switching of the water circuit is performed.
Also, various valves such as a four-way valve can be formed by arbitrarily setting the flow path in the valve body, and other flow paths can be communicated with the valve body in addition to the opening facing the valve seat. It may be a square valve.

[0003]

In the above-described electric multi-way valve, the electric multi-way valve faces a valve seat having a plurality of openings.
A valve body having a plurality of openings must be held in close contact with each other so as not to cause water leakage. On the other hand, the valve element thus held in a close contact state must slide on the valve seat and rotate when switching the flow path, and the above-mentioned close contact force for preventing water leakage is large. The larger, the greater the friction and cohesion between the contact surfaces of the valve seat and the valve element when rotating.

[0004] When the valve element rotates due to the frictional force and the adhesive force, both of them cause large wear, and since the valve seat and the valve element have a plurality of openings, when the valve element rotates, the valve element rotates. In addition, the edge portions of both openings are caught, and particularly in this portion, large wear and damage occur. Such wear or damage causes water leakage between the valve seat and the valve body, resulting in malfunction of the valve. In particular, the valve body that forms the flow path inside is made of ceramic or the like, and the valve seat side that comes into contact with this valve body is often made of an elastic body such as rubber with good sealing properties. When the valve is pressed against the valve seat with a large force to prevent water leakage, the valve bites into the rubber of the valve seat, and when the valve is rotated in this biting state, the rubber valve seat becomes ceramic. The valve body wears out in a short period of time, and the valve seat and the like must be frequently replaced.

[0005] In addition, between the valve seat and the valve body, rust and dust on the piping,
Alternatively, when sand or the like is caught, these bite into the valve seat or the like due to the rotation of the valve body, and the above-mentioned wear is more likely to occur. Further, when the valve body is strongly pressed against the valve seat to improve the sealing property, a strong frictional force and rubber adhesive force are generated when the valve body rotates, so that a large load is applied to the electric device, and the electric If a powerful electric device is used as a countermeasure against the malfunction of the valve, the valve must be expensive.

Accordingly, the present invention provides a rotary disk valve which can rotate with a small load when the valve rotates at the time of switching the flow path, and can operate stably for a long period without damaging the valve seat. The purpose is to provide.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a lower end of a disk valve having a valve pressing cam and a valve raising cam is abutted in a valve box having a plurality of valve holes. So that a slide cam driven by a motor forming an upper cam and a lower cam is provided between the valve pressing cam and the valve raising cam, and a spring is provided above the slide cam. The rotary cam valve is provided with a position detecting means for detecting the rotation of the slide cam to a predetermined position.

[0008] Since the present invention is constructed as described above, the lower cam of the slide cam is in contact with the high portion provided on the valve pressing cam during normal operation of the valve, and the disc valve is moved by the spring via the slide cam. To the valve seat side to securely seal the valve hole. When the motor is energized when the flow path is switched, the slide cam rotates and the lower cam comes off the high part of the valve pressing cam, and the pressing force of the disc valve by the spring is eliminated. Thereafter, the upper cam comes into contact with the valve ascending cam to generate a valve ascending force due to the contact on the mutually inclined surfaces,
Since the valve is lifted, the frictional force between the disk valve and the valve seat is almost eliminated, and the disk valve is rotated together with the slide cam by engagement of the two. When the disk valve rotates to a predetermined position, the rotation of the disk valve is stopped, and then only the slide cam rotates, so that the lower cam rides on the high portion of the valve pressing cam and generates a pressing force of the spring below the disk valve. .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. A communication flow path 4 is formed inside a fixed valve box 3 including a lower valve box 1 and an upper valve box 2 which is liquid-tightly sealed via an O-ring on an upper portion of the lower valve box 1. A bowl-shaped disc valve 5 is provided so as to be reciprocally rotatable, and various connections can be switched by switching the position of the communication flow path 4 with respect to four valve holes provided on the lower surface of the lower valve box 2.

A valve pressing cam 6 is provided at the center of the upper surface of the disk valve 5, and a lower cam 8 on the lower surface of the slide cam 7 is disposed above the valve pressing cam 6. On the upper surface of the disk valve 5, a support arm 10 is erected at a position 180 degrees apart from each other, and a valve ascending cam 11 is formed downward at the tip thereof. On the upper surface of the slide cam 7, upper cams 12 which come into contact with the respective valve lift cams 11 when the slide cam rotates are formed at positions 180 degrees apart from each other. As shown in the figure, the valve pressing cam 6 has a concave portion 13 at the center and a first high portion 14 and a second high portion 15 on both sides thereof, and a connection portion of these portions is an inclined surface. Slide cam 7
The lower cam 8 has a protruding shape having inclined surfaces on both sides and a flat surface at the center, and the upper cam 12 of the slide cam 7 has a protruding shape having a triangular cross section. The valve raising cam 11 projects downward in an inverted triangle symmetrically with the upper cam 12.

A protrusion 16 is provided on the side of the disc valve 5, and when the disc valve 5 rotates, as will be described later, the protrusion is fixed to a side of the lower valve box 1 for supporting a motor support column 17. And the rotation of the disk valve 5 is stopped. Therefore, the column 17 functions as a stopper for stopping the rotation of the disk valve 5. The side of the slide cam 7 is provided with two projections 18 and 19 at a predetermined interval from each other, and the projections 18 and 19 are in contact with the side of the support arm 10 standing upright on the upper surface of the disk valve 5. The rotation of the slide cam 7 is stopped. Therefore, the support arm 10 functions as a stopper for the slide cam 7.

A bearing portion 20 is formed at the center of the upper valve box 2, and a spindle 23 connected to a drive shaft 22 of a motor 21 at the upper end is rotatably fixed to the bearing portion 20. A slide cam 7 is provided at the center of the spindle 23.
The lower end of the spindle 23 is rotatably fitted into a hole 51 provided in the center of the upper surface of the lower valve box 1 at the lower end of the spindle 23. A portion 27 is provided. A spring receiver 28 is provided around the bearing portion 20 of the upper valve box 2, and a spring 30 is housed in the spring receiver 28. One end of the spring 30 abuts on the upper surface of the slide cam 7, Thereby, the slide cam 7 is pressed downward in the figure, and when the lower cam 8 of the slide cam 7 is positioned on the valve pressing cam 6 as described later, the spring 30 causes the disc valve 5 to move through the slide cam 7. The valve is pressed downward in the figure to keep the valve in a sealed state. A weak spring 40 for preventing the disk valve 5 from floating is provided between the upper surface of the disk valve 5 and the lower surface of the slide cam 7. An elastic sheet 29 made of rubber or the like is fixed to a portion of the bottom surface of the lower valve box 1 that contacts the lower end of the disc valve 5. When the lower valve box is pressed downward by the spring 30, the lower valve box is closed. 1
The lower surface of the elastic sheet 29 is in close contact with the elastic sheet 29 to perform a strong sealing action, and a communication hole with a flow path formed in the elastic sheet 29 serves as a valve seat.

A support column 1 erected on the side of the lower valve box 1
The motor 21 supported by the motor 7 uses a bidirectional rotary synchronous motor capable of reciprocating motion, and reciprocating motion is controlled by an external switching signal. At the lower end of the drive shaft 22 of the motor 21, an arm 32 with a built-in magnet 31 is fixed below the distal end.
A detection unit 34 having a Hall IC 33 is provided around the upper end of the upper valve box 2 so as to face the position of the arm 32 at the predetermined rotational position. As a result, when the drive shaft 22 rotates and the arm 32 rotates to a position facing the detection unit 34, the Hall IC of the detection unit 34 detects the magnetic force of the magnet 31 at the tip of the arm 32 and the drive shaft 21 moves to a predetermined position. The rotation of the motor 21 is detected, and the rotation of the motor 21 is stopped. When the motor 21 rotates in the reverse direction and the arm 32 rotates to a position facing the second detector 35, the second detector 3
The Hall IC 33 of No. 5 detects the magnetic force of the magnet 31 at the tip of the arm, detects that the drive shaft 22 has rotated to the second predetermined position, and stops the rotation of the motor 21.

In the rotary disk valve having the above structure, the operation of the disk valve 5, the valve pressing cam 6 and the valve lifting cam 11 provided on the disk valve 5, and the upper cam 12 and the lower cam provided on the slide cam 7 are described. The relationship with the cam 8 will be described with reference to FIG. Initially, the state shown in FIG. 1 is in the state shown in FIG. 5A, in which the motor is not energized, and the slide cam is placed on the first high portion 14 of the valve pressing cam 6 provided on the upper surface of the disc valve 5. 7, the lower cam 8 is mounted. In this state, since the slide cam 7 is lifted by the valve pressing cam 6, the slide cam 7 compresses the spring 30, and as a result, the spring 30 slides. The disc valve 5 is pressed via the cam 7, and the lower end of the disc valve 5 strongly contacts the elastic sheet 29 fixed to the lower valve box, and forms and holds the first flow path in a strongly sealed state.

When a current is applied to the motor 21 so as to give a counterclockwise rotation, for example, from the state shown in FIG. 5A, the spindle 23 is rotated via the drive shaft 22, and the slide cam 7 is integrally formed with the spindle 23. At this time, the disc valve 5 does not rotate due to strong frictional contact with the elastic sheet 29, so that the lower cam 8 of the slide cam 7 is at the first height of the valve pressing cam 6 as shown in FIG. From the part 14 into the concave part 13, the position of the slide cam 7 is lowered,
The contact with the bearing 50 of the lower valve box 1 eliminates the pressing force on the disk valve 5. At this time, the spring 40 prevents the disk valve 5 from floating. Therefore, there is no contact pressure between the lower end of the disk valve 5 and the elastic sheet. From this state, slide cam 7
Is rotated a little more, the upper cam 12 of the slide cam 7
Abuts against the valve lift cam 11 and strongly presses this portion in the rotation direction. As a result, the disc valve 5 is
9, a force for lifting the valve lift cam 11, that is, a force for lifting the disc valve 5, is generated as a component of the pressing force between the inclined surface of the upper cam 12 and the inclined surface of the valve ascending cam 11, The disk valve 5 is reliably lifted, and the frictional force between the disk valve 5 and the elastic sheet 29 is almost eliminated.
Thereby, the rotation of the slide cam 7 is transmitted to the disk valve 5 in the state shown in FIG.
The rotation of the first drive shaft 22 rotates the disk valve 5 counterclockwise.

When the disk valve 5 rotates to a predetermined flow path switching position, the stopper of the column 17 is provided at that position, so that the disk valve 5 does not rotate any more, and only the slide cam 7 rotates. . Therefore, the upper cam 12 of the slide cam 7 rotates beyond the projection of the valve lift cam 11. Upon further rotation, the lower cam 8 of the slide cam 7 rides on the second high portion 15 of the valve pressing cam 6 of the disc valve 5 as shown in FIG. At this time, as shown in FIG. 4, the second projection 19 provided on the side of the slide cam 7 abuts on the side of the support arm 10 supporting the valve lift cam 11, and the rotation thereof is stopped. In this state, as shown by the chain line in (d) in FIG.
Are shown in contact with. At this time, since the arm 32 provided on the drive shaft 22 of the motor 21 rotates to the position of the Hall IC 33, the Hall IC 33 detects the magnetic force of the magnet 31 at the tip of the arm 32, and stops driving the motor 21 based on the signal. Therefore, the disc valve 5 stops at this position, which is the switching position of the new flow path. At this time, since the disk valve 5 is strongly pressed downward by the spring 30 via the slide cam 7, the lower end of the disk valve 5 and the elastic sheet 29 are in strong contact with each other, and the sealing is reliably performed.

When returning from this switching position to the original switching position, the motor 21 is energized so as to rotate in the opposite direction, for example, clockwise. Thereby, the slide cam 7 moves to the left as shown in FIG. 5 (e), and the lower cam 8 of the slide cam 7 falls into the recess 13 from the second high portion 15 of the valve pressing cam 6 of the disc valve 5. The downward pressing force of the disc valve 5 by the spring 30 is released. Thereafter, when the slide cam 7 is further rotated, FIG.
As shown in (e), the upper cam 12 of the slide cam 7 and the inclined surface of the valve lift cam 11 abut. As a result, similarly to the previous operation, the rotational force of the slide cam 7 generates a force that rises with respect to the valve lift cam 11 due to the component force due to the mutual slope contact, and the lower end of the disc valve 5 and the elastic sheet 29 The frictional force is released, and the rotational force of the slide cam 7 is transmitted to the disk valve 5 via the valve lift cam 11, and the disk valve 5 rotates with the rotation of the motor 21. When the disk valve 5 rotates to a predetermined flow path switching position, the disk valve 5 comes into contact with the stopper 17 and is prevented from rotating, so that only the slide cam 7 rotates, and the lower cam 8 of the slide cam 7 is moved to the disk valve. 5 rides on the first high portion 14 of the valve pressing cam 6. Thereafter, the stopper 17 of the slide cam 7 comes into contact with the support arm 10 to prevent rotation, and at this time, the motor 21
The magnet 3 at the tip of the arm 32 provided on the drive shaft 22
Since 1 is close to another Hall IC, this is detected by the Hall IC in the same manner as described above, and the power supply to the motor 21 is stopped. At this time, since the disk valve 5 is strongly pressed downward by the spring 30 via the slide cam 7, the lower end of the disk valve 5 and the elastic sheet 29 are in strong contact, and the sealing is reliably performed.

[0018]

The present invention is configured as described above.
During rotation of the valve at the time of switching the flow path, the valve can be rotated with a small load, and stable operation can be performed for a long time without damaging the valve seat.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotary disk valve according to an embodiment of the present invention.

FIG. 2 is an upper plan view of the rotary disc valve.

FIG. 3 is a bottom plan view of the rotary disk valve.

FIG. 4 is an exploded perspective view of a main part of the rotary disk valve.

FIG. 5 is an operation explanatory view of the rotary disc valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower valve box 2 Upper valve box 3 Valve box 4 Communication flow path 5 Disc valve 6 Valve pressing cam 7 Slide cam 8 Lower cam 10 Support arm 11 Valve rising cam 12 Upper cam 13 Recess 14 First high part 15 Second high Part 16 Projection part 17 Support column 18, 19 Projection 20 Bearing part 21 Motor 22 Drive shaft 23 Spindle 24 Fitting hole 25 Engaging part 26 Hole 27 End part 28 Spring receiver 30 Spring 31 Magnet 32 Arm 33 Hall IC 34 Detecting part

Claims (3)

[Claims] 1. A disk valve having a valve pressing cam and a valve raising cam is rotatably provided in a valve box having a plurality of valve holes so that a lower end thereof is in contact with the disk valve. A slide cam driven by a motor forming an upper cam and a lower cam, a spring is disposed above the slide cam, and position detecting means for detecting rotation of the slide cam to a predetermined position is provided. A rotary disc valve characterized by being provided. 2. An upper cam is provided at a position facing the valve lifting cam, a lower cam is provided at a position facing the valve pressing cam, and a spring is used when the lower cam contacts a high portion provided on the valve pressing cam. The disc valve is pressed to the valve seat side via the slide cam, and when the slide cam rotates and the lower cam comes off the high part of the valve press cam, the pressing force of the disc valve by the spring is eliminated, and then the upper cam rises. The valve comes into contact with the cams to generate a valve lifting force by contacting with each other on the inclined surface, and the engagement between them causes the disk valve to rotate together with the slide valve to a predetermined position. 2. The rotary disk valve according to claim 1, wherein the spring is adapted to generate a pressing force downward of the disk valve by a spring. 3. The rotary disk valve according to claim 1, wherein the position detecting means comprises a magnet provided on the drive shaft and a Hall IC provided on the valve box facing the magnet.