JPH0618754B2 - Check valve valve manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention is a check valve in which a valve body for a check valve having a base portion and a body portion is manufactured by injection molding. The present invention relates to an apparatus for manufacturing a valve body.

(Prior Art) In recent years, in a refrigerator, an air conditioner, or the like, a rotary compressor is used as a compressor of the refrigeration cycle. Therefore, a check valve is installed in the conduit leading to it.

FIG. 4 shows a structure of a check valve provided in a pipe communicating with a rotary compressor such as a refrigerator or an air conditioner. A valve seat 2 is provided inside a pipe 1 through which a refrigerant passes.
Is fixedly provided by the first drawing part 1a of the pipe 1, and the valve body 3 is moved so as to face the valve seat 2 by the second drawing part 1b of the pipe 1 so as to restrict its movement range. It is possible. As shown in FIG. 5, the valve body 3 has a prismatic base portion 3a, a truncated cone-shaped main body portion 3b located at one end of the base portion 3a, and a base portion 3a.
A convex portion 3c located at the other end of a is integrally formed, and the main body portion 3b has a forward flow of the refrigerant in the pipe 1 (arrow A in FIG. 4). Is separated from the valve seat 2 to allow the flow, and the flow in the opposite direction (the arrow B) contacts the valve seat 2 to stop the flow.

FIG. 6 shows a conventional apparatus for manufacturing the above-mentioned valve body 3, which is a cavity 4 for molding the base portion 3a and the main body portion 3b.
A mold 5 having a mold 5 and a mold 7 having a cavity 6 for molding the protrusion 3c constitute a whole mold 8, and a melt of a molding material is formed in the cavities 4 and 6 from a gate 9 commonly formed in the molds 5 and 7. Is injected and cooled, and the valve body 3 is manufactured by injection molding in which molding is performed.

(Problems to be Solved by the Invention) In the above-described conventional apparatus for manufacturing the valve body 3, since the base portion 3a and the main body portion 3b are formed by one mold 5,
The portion of the main body 3b that is to be molded is located deep inside the mold 5, and as a result, it is difficult to process that portion, and the roundness and surface accuracy of the main body 3b, which are of the utmost importance for valve function, are reduced. It had a problem that it could not be obtained well. In addition, if a portion of the main body 3b that is to be molded is damaged, it must be repaired or replaced, but it must be repaired deep inside the mold 5, which is extremely difficult. Not only the portion for molding the main body portion 3b but also the base portion 3a
Since it is necessary to replace the entire mold 5 including the part to be molded, the cost is high.

The present invention has been made in view of the above circumstances, and therefore an object thereof is to make the roundness and surface accuracy of the main body of the valve body good, and at the same time, to prevent damage to the molded portion of the main body. An object of the present invention is to provide an excellent manufacturing device for a check valve body, which can be easily repaired or replaced when it occurs.

[Structure of the Invention] (Means for Solving the Problems) The manufacturing apparatus for a check valve valve body according to the present invention includes a base portion and one of the fluids in the conduit at the end portion of the base portion. Is manufactured by injection molding, the valve body for a check valve integrally having a main body part which is separated from the valve seat by the flow of the above and allows the flow and contacts the valve seat by the opposite flow to stop the flow. The mold for molding the base portion and the main body portion of the valve body is divided into a mold for molding the base portion and a mold for molding the main body portion,
It is characterized by being configured by combining them.

(Operation) According to the above means, since the portion for forming the main body of the valve body is different from the portion for forming the base portion, it is located at a shallow place of the mold and can be easily processed and repaired. .
When it becomes necessary to replace that part, only that part can be replaced, and the other parts can be left as they are.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 11 is an overall mold which replaces the conventional overall mold 8 and is roughly divided into a mold 12 and a mold 13. The mold 12 is a convex portion 14c of a valve body 14 shown in FIG. It has a cavity 15 for molding. On the other hand, type 13
Is for molding the base portion 14a and the main body portion 14b of the valve body 14, and is further divided into a mold 16 and a mold 17, and a cavity 18 having a prismatic hole shape for molding the base portion 14a is formed in the mold 16. , A frustoconical hole-shaped cavity 19 for molding the main body portion 14b is formed in the mold 17, and the two cavities 18 and 19 are combined so as to match each other. Thus, 20 is a gate formed in common to the mold 12 and the mold 16,
This leads to the cavity 18.

Therefore, in the case of the above-mentioned structure, if the molten metal of the molding material is injected from the gate 20, it will enter the cavity 18,
Further, it enters into the cavities 19 and 15 from there, and is cooled and mold-molded. By this injection molding, the valve body 14 integrally having the base portion 14a, the main body portion 14b and the protruding portion 14c is manufactured.

In the apparatus for manufacturing the valve body 14 as described above, the main body 1
The mold 17 which is a part for molding 4b is separate from the mold 16 which is a part for molding the base portion 3a.
Since the molding cavity 19 is formed in the mold 17 which is a separate body from the mold 16, it is located at a shallow place of the mold 17 and therefore can be easily machined to improve both roundness and surface accuracy. . For this reason, the roundness and surface accuracy of the main body portion 14b can be improved, and when the cavity 19 of the mold 17 is damaged, even if it is repaired, a shallow place of the mold 17 is required. It can be easily done for the cavity 19 located at, and if it needs to be replaced further, it only needs to replace the mold 17, and it is necessary to replace the entire mold 13 including the mold 16 for molding the base portion 3a. Since there is no such thing, the cost can be reduced. In addition, degassing during injection molding can be expected from the mating surface between the mold 16 and the mold 17, which allows the speed at the time of molding,
It is also possible to easily adjust the pressure and the like.

The valve body 14 manufactured by the manufacturing apparatus of the above embodiment has stepped portions 14d at four corners around the boundary between the base portion 14a and the main body portion 14b. As shown in FIG. The valve body 21 may have a shape without the portion 14d.
Regarding this valve body 21, 21a is a base portion, 21b is a main body portion, 21c is a protruding portion, and 21d is a base portion 21.
This is a so-called parting line by dividing the boundary between a and the main body portion 21b.

In addition, the triangular portion 21f below the parting line 21d does not smoothly connect to the frustoconical body portion 21b, but may have a planar shape, for example. (14b) may have a spherical shape instead of the truncated cone shape.
The a (14a) may also have a shape other than the prismatic shape.

Besides, the present invention is not limited to the embodiments described above and shown in the drawings, and various modifications may be made without departing from the scope of the invention.

[Effects of the Invention] As is clear from the above description, the check valve valve body manufacturing apparatus according to the present invention is provided with a base portion and one of the fluids in the conduit at the end portion of the base portion. A valve body for a check valve, which is integrally formed with a main body part which is separated from a valve seat by a flow and allows the flow and contacts the valve seat by the opposite flow to stop the flow, is provided. A mold for molding the base body and the main body of the valve body is divided into a mold for molding the base body and a mold for molding the main body, and these are combined together. Therefore, the circularity and surface accuracy of the main body of the valve body are made good,
At the same time, it has an excellent effect that it is possible to easily repair and replace the scratched part of the main body, and to adjust the molding speed, pressure, etc. is there.

[Brief description of drawings]

FIG. 1 is a sectional view of the entire manufacturing apparatus showing an embodiment of the present invention, FIG. 2 is a perspective view of a valve body manufactured by the apparatus of the same embodiment, and FIG. 3 is a perspective view showing a different example of the valve body. 4 and 5 are sectional views showing examples of use of the valve body, FIG. 5 is a perspective view of a valve body manufactured by a conventional apparatus, and FIG. 6 is a sectional view of the entire conventional manufacturing apparatus. In the drawings, 11 is a whole mold, 13 is a mold, 14 is a valve body, and 14a.
Is a base portion, 14b is a main body portion, 16 and 17 are molds, 18 and 1
9 is a cavity, 21 is a valve body, 21a is a base portion, 21b
Indicates the main body.

Claims (1)

[Claims] 1. A base portion and an end portion of the base portion, which is separated from a valve seat by one flow of a fluid in a pipeline and allows the flow to contact the valve seat by an opposite flow. A method for manufacturing a valve body for a check valve, which integrally has a main body portion for stopping a flow, by injection molding, wherein a mold for molding a base body portion and a main body portion of the valve body is a mold for molding the base body portion. And a mold for molding the main body part, and the structure is formed by combining them, and a manufacturing device for a valve body for a check valve.