JPH0667970U - Check valve body - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a check valve body which can be manufactured by cold forging and can be manufactured at very low cost. [Structure] A seal surface portion (7) engaged with a valve seat (1a) of a valve body, and a shaft portion (8) connected to the seal surface portion and slidably inserted in a guide hole (5) of the valve body. The check valve body (3) is provided with a plurality of communication grooves (8a) extending in the axial direction of the shaft portion on the peripheral surface of the shaft portion (8), arranged equidistantly in the circumferential direction of the shaft portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a check valve body of a check valve. More particularly, the present invention relates to a check valve body in a check valve that allows fluid to flow in one direction and blocks flow in the opposite direction.

[0002]

[Prior art]

 In the in-line type check valve, the valve body is pressed to the primary side by springs in the linearly arranged primary side and secondary side passages. Fluid flows freely from the primary passage to the secondary passage by pushing the valve body against the force of the spring, but the valve element does not hit the seat and does not open, so the reverse flow from the secondary passage to the primary passage Is prevented.

Further, in the angle type check valve, as shown in FIGS. 3 and 4, the primary side passage 11 and the secondary side passage 12 are arranged in an L-shape and provided at an intersection of the L-shape. The valve body 13 is biased toward the primary side by the spring 14 so that the valve body slides in the insertion hole 15 on the secondary side located on the extension line of the primary side. The fluid flows freely from the primary passage 11 to the secondary passage 12 by pushing the valve body 13 against the force of the spring 14, but the fluid flow from the secondary passage 12 to the primary passage 11 is Since the body 13 does not hit the seat 16a and does not open, the structure is cut off.

In the above-described check valve, a check including a seal surface portion 17 that engages with the valve seat 16a of the main body and a shaft portion 18 that is connected to the seal surface portion and slidably inserted into a guide hole of the valve main body A valve body is used.

[0005]

[Problems to be solved by the device]

 Since the shaft portion 18 slides in the guide hole 15, it is necessary to allow the fluid in the guide hole to escape to the outside. In the conventional check valve body, for example, as shown in FIG. 3, a hole 13a in the radial direction and a hole 13b in the longitudinal direction are both formed in the valve body 13, and since these holes have a small diameter, they are drilled. It is necessary. Therefore, the manufacturing cost of the valve body is very high, and therefore the manufacturing cost of the check valve itself is also very high.

Instead of forming a hole, an attempt has been made to form a communication groove 18a on the peripheral surface of the shaft portion 18 by cutting as shown in FIG. However, when the communication groove is cut as described above, it is still expensive.

The inventor has paid attention to the fact that the manufacturing cost is high if the conventional check valve body is manufactured by cutting as described above. At this time, in the check valve, the sealing surface engages with the valve sheet to shut off the flow, and the shaft part may slide in the guide groove. Focused on not requiring such a high degree of precision. Then, it was studied to form the communication groove 18a in the conventional apparatus shown in FIG. 4 by cold forging to reduce the cost.

However, when one communicating groove 18a is formed by cold forging as shown in FIG. 4, the forming force acts only in one direction of the shaft, so that the deformation of the shaft portion 18 is remarkable, and therefore, In addition, the necessary function as a check valve is not fully fulfilled.

In order to solve such a problem, it is considered to devise a tool used in cold forging so that the shape of the shaft portion of the check valve body is less distorted from a circular cross section, for example. To be However, the tool becomes very complicated when trying to machine such a shape with less distortion. Therefore, it was very difficult to perform cold forging by the conventional method.

[0010]

[The purpose of the device]

 An object of the present invention is to provide a check valve body that can be manufactured by cold forging and can be manufactured at very low cost.

[0011]

[Means for Solving the Problems]

 The present invention relates to a check valve body comprising a seal surface portion which engages with a valve seat of a valve body and a shaft portion which is connected to the seal surface portion and slidably inserted into a guide hole of the valve body. The above object is achieved by a check valve body characterized in that a plurality of communication grooves extending in the axial direction of the shaft portion are arranged on the surface in the circumferential direction of the shaft portion.

[0012]

[Action]

 In the present invention, a communication groove is formed on the peripheral surface of the shaft portion. Therefore, the communication groove can be formed from the outside by cold forging. Further, in the present invention, a plurality of communication grooves are arranged on the peripheral surface of the shaft portion and equally arranged on the peripheral surface of the shaft. Therefore, by simultaneously forming these multiple communication grooves by cold forging, the forming force acting on the check valve body from the cold forging tool acts in a balanced manner in the central axis direction of the shaft portion. It is possible to reduce the deformation of the shaft during the forging. Therefore, according to the present invention, a check valve body that can achieve a sufficient function when used as a check valve is easily manufactured. Further, according to the present invention, since a plurality of communication grooves are formed on the peripheral surface of the shaft part, the passage area of the fluid is dispersed by the plurality of grooves to allow a desired flow rate even if the depth of each communication groove is shallow. . Moreover, for this reason, the processing amount of each communication groove can be small, and therefore the deformation of the shaft portion during cold forging can be reduced.

[0013]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a first embodiment of the present invention in which a primary passage 1 and a secondary passage 2 in a valve body are bent in an L shape, and a guide hole 5 is formed on an extension of the primary passage. Has been done. The valve body 3 slides in the guide hole 5. The valve body 3 is composed of a sealing surface portion 7 having a frustoconical sealing surface 7a and a shaft portion 8 connected to the sealing surface portion. A spring 4 is inserted in the guide hole 5 so as to press and urge the sealing surface 7a against the valve seat 1a of the valve body.

As shown in FIG. 1B, four communication grooves 8a are formed on the peripheral surface of the shaft portion by cold forging. The communication groove 8a extends in the axial direction of the shaft portion 8, and as shown in FIG. 1 (b), four communication grooves are arranged around the shaft portion 8 at intervals of 90 degrees. .

In the check valve having the valve body shown in FIG. 1 having this structure, when the primary side pressure increases, the spring 4 is pressed by the primary side fluid, and the check valve body 3 is pushed open from the valve seat 1a. The fluid flows from the portion to the secondary passage 2. At this time, the fluid in the guide hole 5 flows from the communication hole 8a on the peripheral surface of the shaft portion 8 to the secondary passage 2, so that the check valve operates smoothly.

In the above embodiment, the number of communication grooves is four, but the number of communication grooves may be two or more, and may be four or the like shown in the embodiment. In this case, it is important that the communication grooves are arranged symmetrically with respect to the central axis A in the sectional view shown in FIG.

Another embodiment is shown in FIG. In FIG. 2, the seal surface portion 7 is a flat seal surface instead of a conical shape, and the shaft portion 8 connected to this seal surface portion projects to the center of the seal surface portion. As shown in FIG. 2B, three communication grooves 8a extending in the axial direction are formed around the shaft portion.

In the check valve body 3 shown in FIG. 2, the seal surface portion 7 is pressed and biased by the spring 4 provided in the secondary passage 2 against the valve seat 1a of the main body. The shaft portion 8 is slidably inserted in the guide hole 5 of the valve body connected to the secondary flow passage 2, and when the check valve body 3 slides, the fluid in the guide hole 5 is in the communication groove 8a. Through the communication groove 8a and into the guide hole 5.

FIG. 2C shows a cross section of a case where the number of communication grooves is two, and the present invention only needs to have a plurality of communication grooves, and thus two communication grooves may be used.

Further, in the embodiment of FIG. 2, a communication groove 7b in the radial direction is also formed on the back side of the seal surface portion 7, and the communication groove 7b communicates with the communication groove 8a in the longitudinal direction. This communication groove 7b may also be formed by cold forging, and even when the shaft valve body is pressed to the right side in FIG. 2 (a), the communication groove 7b maintains the flow path connected to the guide hole 5. It is supposed to be done.

Although the angle type check valve is described in the above embodiment, the present invention can be applied to the check valve body of the inline type check valve. Further, the present invention is not limited to a check valve as a single unit, but can be applied to a check valve body incorporated in a spool of a counterbalance valve and a check valve body incorporated in other valves.

In addition, in the check valve body 3 of the present embodiment, although the outer surfaces of the seat surface portion 7, the shaft portion 8, the communication grooves 8a, 7b, etc. are formed by cold forging, the valve seat 1a of the valve body and Only the sealing surface 7a of the sealing surface portion 7 is machined in a later process to improve the sealing property.

[0023]

[Effect of device]

 In the present invention, a communication groove is formed on the peripheral surface of the shaft portion. Therefore, the communication groove can be formed by forging from the outside.

Further, in the present invention, a plurality of communication grooves are arranged on the peripheral surface of the shaft portion and equally arranged on the peripheral surface of the shaft. Therefore, by simultaneously forming these multiple communication grooves by cold forging, the forming force acting on the check valve body from the cold forging tool acts in a balanced manner in the central axis direction of the shaft portion. Moreover, it is possible to reduce the deformation of the shaft during cold forging. Therefore, according to the present invention, a check valve body that can achieve a sufficient function when used as a check valve can be easily manufactured.

Further, according to the present invention, since a plurality of communication grooves are formed on the peripheral surface of the shaft portion, a desired flow rate can be flown even if the depth of each communication groove is shallow, and the processing amount of each communication groove is small. Therefore, the deformation of the shaft during cold forging can be reduced.

[Brief description of drawings]

1 shows a first embodiment of the present invention, FIG. 1 (a) is a cross-sectional view, and FIG. 1 (b) is a right side view of FIG. 1 (a).

FIG. 2 shows a second embodiment and a third embodiment of the present invention,
2 (a) is a cross-sectional view of the second embodiment, and FIG. 2 (b) is shown in FIG.
FIG. 2A is a right side view, and FIG. 2C is a view of another embodiment.
It is a right view corresponding to (b).

3 shows a conventional device, FIG. 3 (a) is a cross-sectional view, FIG.
FIG. 3B is a right side view of FIG.

FIG. 4 shows another conventional device, FIG. 4 (a) is a cross-sectional view, and FIG. 4 (b) is a right side view of FIG. 4 (a).

[Explanation of symbols]

 1 Primary side passage 2 Secondary side passage 3 Check valve body 4 Spring 5 Guide hole 7 Seat surface portion 8 Shaft portion 8a Communication groove

Claims (2)

[Scope of utility model registration request] 1. A check valve body comprising a seal surface portion that engages with a valve seat of a valve body, and a shaft portion that is connected to the seal surface portion and slidably inserted into a guide hole of the valve body. A check valve body, wherein a plurality of communication grooves extending in the axial direction of the shaft portion are arranged on the peripheral surface in the circumferential direction of the shaft portion. 2. The check valve body according to claim 1, which is manufactured by cold forging.