JPS6145417Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a rotary valve.

A rotary valve having a structure such as that shown in Japanese Patent Application Laid-Open No. 56-101944 is well known. This rotary valve has a pair of disk-shaped flow control bodies 1 and 2, as shown in exploded view in Fig. 1, arranged in a cylindrical casing so that they can be fixed at an appropriate rotational position, and a rotary valve 3, which is rotated by a shaft 4, is interposed between them in close contact with each other.
The flow control bodies 1 and 2 have flow holes 1a and 2a.
An arc-shaped hole 3a that communicates the two holes 1a, 2a is provided in the rotary valve 3, and by rotating the rotary valve 3 with a gear 5, the two holes 1a, 2a are communicated for a predetermined period at a predetermined timing during one rotation of the rotary valve.

However, since the rotary valve described above has a structure in which the rotary valve 3 is rotated between a pair of flow control bodies 1 and 2 with both surfaces thereof being used as sealing surfaces, the seal itself is not only technically extremely difficult. However, when the rotary valve 3 rotates, the sliding resistance increases, and the sliding surfaces thereof rapidly wear out, making it impossible to maintain a sufficient sealing condition. Furthermore, since the rotary valve 3 interposed between the pair of flow rate controllers 1 and 2 is driven, the pressurized fluid comes into direct contact with the drive shaft 4, so it is necessary to support the drive shaft 4 in a tightly sealed state. Therefore, there are technical difficulties in this respect as well.

In view of the above, it is an object of the present invention to provide a rotary valve that has a structure that is extremely easy to seal and that can maintain a sufficient sealing state over a long period of time.

In order to achieve the above object, the rotary valve of the present invention has a piston part at one end of the rotary valve tightly sealed to a cylinder part formed at one end of the rotary drive shaft so that it can slide in the axial direction and transmit rotational force. and rotate the sealing surface at the other end of the rotary valve to the seat surface at the end surface of the valve seat assembly in which the cylindrical first valve seat body is rotatably inserted into the cylindrical second valve seat body. as close as possible,
A fluid inflow hole formed in the first valve seat body is opened at a position offset from the center of the seat surface, and an outflow hole formed in the second valve seat body is opened in the seat surface, A fan-shaped or semicircular communication groove that temporarily communicates the inflow hole with the outflow hole during one rotation of the valve is recessed in the sealing surface of the valve, and is located at the center of the first valve seat body and the rotary valve. , is constructed by drilling a communication hole that communicates the inflow hole with the inside of the cylinder portion.

According to the rotary valve of the present invention, the rotary valve is rotated at a constant speed by the rotary drive shaft, and thereby the fluid flows between the inflow hole and the outflow hole of the valve seat assembly. The valve can be opened for a predetermined period at a predetermined timing during one rotation, and the timing and period for opening the valve can be determined by appropriately rotating the first valve seat body and the second valve seat body constituting the valve seat assembly. It can be controlled arbitrarily by
In addition, in the above-mentioned rotary valve, the fluid pressure supplied to the inlet hole of the valve seat assembly acts on the piston part and presses against the valve seat assembly, so there is always a sealing force between the two that is proportional to the supplied fluid pressure. It will be sealed.

According to the rotary valve of the present invention, the contact sealing surfaces are only between the sealing surface of the rotary valve and the seat surface of the valve seat assembly, and between the piston portion of the rotary valve and the cylinder portion of the rotary drive shaft. Both of these parts are easy to seal due to their structure, and the seal between the rotary valve and the valve seat assembly is designed to generate a sealing force by introducing supply fluid pressure behind the rotary valve. Therefore, a sufficient sealing condition can be maintained for a long period of time regardless of wear of the contact sealing surface.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In FIGS. 2 and 3, 11 is a cylindrical casing, 12 is a rotary drive shaft, 13 is a rotary valve, and 14 is a valve seat assembly. The rotary valve 13 is rotated by the rotary drive shaft 12, and the fluid inflow hole 14a and the fluid outflow hole 14b in the valve seat assembly 14 are communicated with each other for a certain period at a predetermined timing in one rotation of the rotary valve 13. I have to.

The rotary drive shaft 12 includes a shaft support 12a that is rotatably supported by bearings 17, 17 installed inside the casing 11, and has a driving gear 19 fixed to the outer end protruding from the casing 11. A cylinder portion 12b is fitted with a dust seal 20 that comes into contact with the outer end surface of the cylinder portion 12b, and is formed at the inner end of the shaft support 12a in the casing 11.
, the piston portion 13a at one end of the rotary valve 13
are fitted tightly so that they can slide in the axial direction, and the gap between them is sealed with a packing 21 that has low sliding friction resistance,
Furthermore, the transmission shaft 22 is fitted into a hole bored at an eccentric position on the opposing end surfaces of both, and the rotary drive shaft 12 and the rotary valve 1 are connected to each other.
3 are integrated to transmit rotational force.

As shown in FIGS. 2 and 4, the rotary valve 13 includes a valve portion 1 integrally connected to a piston portion 13a.
3b, and a fan-shaped or semicircular communication groove 13d with a central angle β of 180° or less is recessed in the sealing surface 13c at the end face, so that the valve seat assembly 14 Inflow hole 14
a and the outflow hole 14b. In addition, communication holes 13e and 14d are bored at the center of the rotary valve 13 and the valve seat assembly 14, and these communication holes constantly connect the inflow hole 14a of the valve seat assembly 14 to the inside of the cylinder portion 12b. The fluid pressure introduced into the cylinder portion 12b presses the rotary valve 13 against the seat surface 14c of the valve seat assembly 14, thereby sealing the space between them.

As shown in FIGS. 2 and 5, the valve seat assembly 14 includes a cylindrical first valve seat body 25 having an inlet hole 14a opened at a position offset from the center of the seat surface 14c, and an outflow hole 14a. It is composed of a substantially cylindrical second valve seat body 27 in which a hole 14b is bored, and the first valve seat body 2
5 are rotatably inserted into the second valve seat body 27 via the O-ring 26, and they are inserted into the casing 1.
1 by being rotatably inserted into the holder. Further, the second valve seat body 27 connects the outflow port 14e communicating with the fluid outflow hole 14b from the side surface of the second valve seat body 27 to the outflow guide hole 11 of the casing 11.
It is connected to a. Therefore, the inflow hole 14a
and the relative rotational position of the opening in the seat surface 14c of the outflow hole 14b and their casing 1
In order to arbitrarily adjust the rotational position relative to the first
The valve seat body 25 is removably fixed to a second valve seat body 27, and the second valve seat body 27 is removably fixed to the casing 11.

In the rotary valve configured as described above, when the gear 19 is rotated by an external rotational force, the rotational force is transmitted to the rotary valve 13 via the rotary drive shaft 12 and the transmission drive 22, and the rotary valve 13 is rotated at a constant speed. Rotate with. As a result, the inflow hole 14a and the outflow hole 14b of the first valve seat body 25 communicate with each other at a predetermined timing during one rotation of the rotary valve 13, and after a certain period of time, the two holes 14a and 14b are cut off. That is, if the rotary valve 13 having the communication groove 13d as shown by the chain line in FIG. ₅ is rotated in the direction of the arrow R, as shown in FIG. The communication between the outflow hole 14b continues to increase from the blocked state to the maximum communication state, and after maintaining the maximum communication state in the rotation angle θ ₂ range, the communication between both holes reaches its maximum in the rotation angle θ ₃ range. The communication state decreases from the communication state to the cutoff state, and the cutoff state is maintained within the range of rotation angle θ ₄ , and this is repeated every rotation of the rotary valve 13.

Furthermore, when the rotary valve having the communication groove 13d is rotated in the R direction with the inlet hole 14a and the outlet hole 14b arranged as shown in FIG. 7, both holes communicate with each other as shown in FIG. Become.

In one rotation of the rotary valve 13, both holes 14
The timing and period of communication between a and 14b can be determined by loosening the screws 31 and 32 and connecting the first valve seat body 25.
It can be adjusted by rotating the second valve seat body 27 integrally or individually. That is, by loosening only the screw 32, both valve seat bodies 25 and 27 are removed.
If rotated as one, both holes 14a, 14b
The communication period can be kept constant and the communication time can be changed, and the first valve seat body 2 can be opened by loosening only the screw 31.
By rotating only 5, the communication period can be changed.

In either the communicating or blocking state of both the holes 14a and 14b, the rotary valve 13 and both valve seat bodies 2
5 and 27 is reliably sealed with a pressing force proportional to the fluid pressure supplied to the inflow hole 14a. That is, the inflow hole 14a is the communication hole 1.
4d and the cylinder portion 12b via the communication hole 13e.
Since the fluid pressure supplied to the inflow hole 14a flows into the cylinder portion 12b, it acts as a force that presses the rotary valve 13 against both valve seat bodies 25 and 27. Therefore, even if the sealing surface 13c of the rotary valve 13 and the seat surface 14c of the valve seat assembly 14 are worn out as the rotary valve 13 rotates, the two will come closer to each other by the worn thickness, and a good seal will be maintained between them. maintained.

Note that the first valve seat body 25 and the second valve seat body 27
can also be configured to be rotated by remote control of an external electric motor (not shown),
In that case, since the rotation of both valve seat bodies 25, 27 can be prevented by the brake of the electric motor, the screws 31, 32 can be omitted.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the separated state of the main components of the conventional example, Fig. 2 is a sectional view of the embodiment of the present invention, Fig. 3 is its left side view, and Figs. 4 and 5 are the rotary valve and A front view of the valve seat assembly, FIG. 6 is a diagram explaining the operation of the above embodiment, FIG. 7 is a front view of the valve seat assembly showing a state where the positions of the inflow hole and the outflow hole have been changed, and FIG. 8
The figure is a diagram showing the operation. 12...Rotation drive shaft, 12b...Cylinder part,
13...Rotary valve, 13a...Piston part, 13c
... Seal surface, 13d ... Communication groove, 13e ... Communication hole, 14 ... Valve seat assembly, 14a ... Inflow hole,
14b...Outflow hole, 14c...Seat surface, 25...
...first valve seat body, 27...second valve seat body.

Claims (1)

[Scope of utility model registration request] A piston part at one end of the rotary valve is tightly fitted into a cylinder part formed at one end of the rotary drive shaft so as to be able to slide in the axial direction and transmit rotational force, and a sealing surface at the other end of the rotary valve is The cylindrical first valve seat body is connected to the cylindrical second valve seat body.
rotatably in close contact with the seat surface of the end face of the valve seat assembly rotatably inserted into the valve seat body;
A fluid inflow hole formed in the valve seat body is opened at a position offset from the center of the seat surface, and an outflow hole formed in the second valve seat body is opened in the seat surface, thereby sealing the rotary valve. A fan-shaped or semicircular communication groove is recessed in the surface to temporarily communicate the inflow hole with the outflow hole during one rotation of the surface, and the inflow hole is provided at the center position of the first valve seat body and the rotary valve. A rotary valve characterized in that a communication hole is bored through which the hole communicates with the inside of the cylinder portion.