JPH033102B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a ceramic rotary valve, in which a collar portion is integrally formed on a ceramic rotary shaft for valve operation that is disposed through a ceramic valve box, and the rotation thereof is A rotary ceramic rotating body in which the shaft collar portion and the valve box are formed with sealing surfaces that face each other in contact with each other in the direction of the rotational axis, and the contact sealing action of these sealing surfaces seals the rotational shaft penetrating portion of the valve box. Regarding valves.

[Conventional technology]

Conventionally, in the above ceramic rotary valve,
As shown in FIG. 5, there is a collar portion 3A integrally formed on the ceramic rotating shaft 3, and a sealing surface a facing each other with respect to the ceramic valve box 1.
b was directly formed by cutting, polishing, etc.

2 in the figure is a ceramic valve body. (Unable to show references).

[Problem that the invention seeks to solve]

However, because the end face that forms the sealing surface on the rotating shaft side is located at the corner of the rotating shaft body and the flange, and the part that forms the sealing surface on the valve box side is also located at the back of the rotating shaft through hole. Furthermore, it is extremely difficult to finish the sealing surfaces, resulting in a problem in that the finishing accuracy of the sealing surfaces is low, resulting in a reduction in sealing performance.

An object of the present invention is to facilitate the forming process of a sealing surface by rationally improving the sealing surface forming structure.

[Means for solving problems]

A characteristic configuration of the ceramic rotary valve according to the present invention is that sealing surfaces that face and contact each other in the direction of the rotational axis are formed in the valve box and the rotating shaft collar, and a portion of the valve box that forms the sealing surface; , the portions of the rotating shaft collar that form the sealing surfaces are each made of separate ceramic annular members, and these ceramic annular members are provided on the main body side of the valve box and on the main body side of the rotating shaft. On the other hand, it is integrally joined with an adhesive, and its functions and effects are as follows.

[Effect]

(a) Prior to integrally joining ceramic annular members separate from the rotating shaft and valve body to the rotating shaft and valve body, a sealing surface is formed on each of the annular members, and finishing processing is performed on each of the annular members. This allows the seal surface to be formed much more easily than in the past, where the seal surface was finished at the corner of the rotating shaft and the flange, or at the back of the rotating shaft through-hole. It can be made much easier.

(b) Since the finishing process is extremely easy, the finishing accuracy of the sealing surface can be dramatically improved.

(c) a seal between the rotating shaft body and the separate annular member;
Further, the seal between the valve body body and the separate annular member is reliably achieved by the adhesive layer for integrally joining these separate annular members to the rotating shaft body and the valve body body.

(d) Due to the flexibility of the adhesive layer before solidification, the rotating shaft side annular member and the valve box side annular member are
Since they can be integrally joined to the rotating shaft body side and the valve body body side with their relative positions appropriate,
The contact sealing condition between the sealing surfaces can be made extremely good.

〔Effect of the invention〕

As a result of the above, the productivity of the ceramic rotary valve as a whole can be improved, and the manufacturing cost can be reduced due to the improved productivity.

Furthermore, the sealing performance at the rotary shaft penetrating portion has been greatly improved compared to the previous model, and a ceramic rotary valve with high reliability against fluid leaks has been created.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in Fig. 1, a ceramic valve box 1
A ceramic ball valve body 2 is installed inside the valve body, and a ceramic rotating shaft 3 for rotating the ball valve body 2 is supported through the valve body, thereby forming an all-ceramics ball valve.

In the figure, 4 is a ceramic annular valve seat that acts as a seal through contact with the ball valve body 2, and is assembled to the valve body 1 in a fitting manner and is fixed to the valve body 1 by adhesive X bonding. .

The valve box 1 is formed into two parts in the direction of the flow path axis,
The divided portions 1A and 1B are integrally joined together with adhesive applied to their joining surfaces.

In other words, in order to provide a seal between the two divided parts 1A and 1B, an O-ring may be inserted between the two divided parts 1A and 1B, but in that case, the joint surface is processed to insert the O-ring. The process becomes complicated, and the fact that cutting of ceramic materials is inherently difficult results in disadvantages in terms of manufacturing and manufacturing costs.

Therefore, as described above, both the divided parts 1A and 1B are joined with adhesive, and both divided parts 1A and 1B are bonded with adhesive layer X.
It is designed to seal between A and 1B.

In addition to integrally forming the collar portion 3A on the rotating shaft 3,
Annular seal surfaces a and b are formed on the annular end surface of the collar portion 3A and on the inner surface of the valve box 1 opposing thereto, and are in contact with each other in the direction of the rotation axis axis P, and the contact sealing effects of these seal surfaces a and b are formed. The structure is such that the rotary shaft penetrating portion in the valve box 1 is sealed.

The rotating shaft 3 is connected to the ball valve body 2 by fitting and connecting with different diameters so as to be allowed to move in the axis direction P of the rotating shaft, and a fitting hole 5 is provided for the fitting connection.
is formed so that it communicates with the flow passage hole f of the valve body 2, and the contact pressure between both annular seal surfaces a and b is increased by the rotating shaft pressing action by fluid pressure, thereby improving sealing performance. It is structured as follows.

To form both annular seal surfaces a and b, FIG.
As shown in FIG. 3, a portion of the rotating shaft flange 3A that forms the annular sealing surface a, and a portion of the valve box 1 that forms the annular sealing surface b are each made of separate annular ceramics. Formed by members A and B,
The annular members A and B are attached to the annular end surface c of the main body portion of the collar portion 3A and the bottom surface d of the annular recess formed in the main body portion of the valve box 1.
Similar to the bonding of A and 1B, they are fixed by adhesive X bonding.

That is, by configuring the parts forming the annular seal surfaces a and b as separate parts, the annular seal surfaces a and b can be easily formed prior to joining the annular members A and B.

[Another example]

Next, another embodiment of the present invention will be described.

As shown in FIG. 4, a ceramic annular member A has a collar portion 3A formed on a portion of the rotating shaft 3 located outside the valve box 1, and sealing surfaces a and b.
B may be separately bonded to the valve box side end surface of the collar portion 3A and the outer surface of the valve box 1 facing thereto using an adhesive.

Various adhesives can be used.

The present invention can be applied to various types of ceramic valves as long as they are of the rotary operation type.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention,
FIG. 1 is a longitudinal sectional view, FIG. 2 is an enlarged sectional view of the seal portion, and FIG. 3 is an exploded perspective view of the seal portion. Fourth
The figure is an enlarged sectional view showing another embodiment of the present invention.
FIG. 5 is an enlarged sectional view showing a conventional structure. 1... Valve box, 2... Valve body, 3... Rotating shaft, 3A
...Brim portion, A, B...Annular member, a, B...Sealing surface, X...Adhesive.

Claims (1)

[Claims] 1 Valve body 2 disposed through the ceramic valve box 1
A collar portion 3A is integrally formed on the operating ceramic rotating shaft 3, and the rotating shaft collar portion 3A and the valve box 1 are connected to each other.
The rotary valve is a ceramic rotary valve having seal surfaces a and b that face each other and are in contact with each other in the direction of the rotation axis P, and a portion of the valve body 1 that forms the seal surface b and a portion of the rotation shaft flange. A portion of the portion 3A that forms the sealing surface a is formed by separate ceramic annular members B and A, and these ceramic annular members B and A are connected to the main body side of the valve box 1 and the rotating shaft. A ceramic rotary valve that is integrally joined to the main body side of 3 with adhesive X.