JPH0735960U - Charge valve - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] The present invention provides a 0 ring for maintaining airtightness between the valve stem of the valve core 1 and the packing that keeps airtightness of the valve mouth of the conventional valve core at the lower end of the valve core sub-assembly 15. The purpose is to substitute one packing 14 formed by rubber vulcanization. The charge valve of the present invention comprises a valve stem 1 having an internal thread 2, a straight portion 3, a tapered surface 4, and a straight opening 5 formed from above, an external thread 11, a stopper 12, and a stopper 12. The packing fitting portion 13 is provided,
Further, a packing 14 is integrally fixed by rubber vulcanization to a lower portion of a valve core main body 6 having an insertion hole 8, a through hole 9 of a shaft 7 and a window 10 for injecting air in a central portion to form a valve core sub-assembly 15. The shaft 7 having the tapered portion 16 is inserted into the insertion hole 8 of the valve core sub-assembly 15, and the shaft 7
The valve core 19 is formed by inserting the compression coil spring 18 into the upper part of the above and caulking the upper end of the shaft.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a charge valve suitable for enclosing a refrigerant in an air conditioner of an automobile.

[0002]

[Prior art]

 FIG. 2 is a vertical sectional view of a conventional charge valve (which is a tire valve in the publication) disclosed in Japanese Utility Model Laid-Open No. 59-144269. It is configured in combination with the valve core 19. The valve stem 1 is provided with a screw on the upper portion of the outer surface thereof, and on the inner surface thereof, a straight elongated opening 3 and a female screw 21 are provided, and a step portion 28 is formed on the lower portion of the female screw by recess processing. ing. The valve core 19 is composed of a valve core body 6 having a reverse bottomed cylindrical shape, a shaft 7, and a compression coil spring 18.

The valve core body 6 having a reverse bottomed cylindrical shape is provided with an insertion hole 8 for the shaft 7 and an air injection window 10 formed by slitting at the center of the upper end, and an outer surface of the valve core body 6. An O-ring 22 and an external thread 23 are provided, and a C-shaped tapered surface 24 is provided at the center of the lower end 29. Further, the shaft 7 has a dowel 25 at an intermediate portion, and a cylindrical packing 26 is fixed to a lower surface of the dowel by a valve packing receiver 27 having a substantially T-shaped cross section, and the upper part of the shaft 7 is fixed to the valve core main body. The insertion hole 18 is inserted into the shaft to position the compression coil spring 18 on the upper surface of the valve core body 6, and the upper end of the shaft is caulked to form the spring stop portion 17. Therefore, when the male thread 23 of the valve core 1 is screwed into the female thread 21 of the valve stem 1, the lower end 29 of the valve core is brought into contact with the step portion 28 of the valve stem to fix the valve core 19.

[0004]

In the conventional charge valve, when the valve core 19 is strongly screwed into the valve stem 1, the step portion 28 of the valve stem is strongly pressed by the lower end portion 29 of the valve core. There is a problem that the step portion 28 is deformed or the end portion thereof is damaged. Further, the airtightness between the valve core 19 and the valve stem 1 is due to the 0 ring 22, but there is a problem that a large resistance when the 0 ring is inserted sometimes damages the 0 ring and impairs the airtightness. Further, the valve core 20 has a large number of parts and requires many processing steps, which causes a problem of high cost.

[0005]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention uses a valve core in a conventional valve core 19 and an O-ring 22 and a packing 26, which have been used to keep the valve core 19 and the valve stem 1 airtight. One packing 14 formed by rubber vulcanization at the lower end of the sub-assembly 15 can be used as a substitute to significantly reduce the number of parts, and a stopper provided on the outer side of the valve core body 9 allows the mating coupler ( (EN) A charge valve in which a shaft end distance L 1 which has a great influence on valve opening by (not shown) can be accurately secured.

That is, in the charge valve of the present invention, the internal thread 2 of the valve stem 1, the straight portion 3, the taper surface 4, and the straight opening portion 5 are formed from above, and one of them is formed on the outer surface. A male screw 11 and the lower part thereof are made smaller in diameter to form a stopper 12 at the lower end, a packing fitting part 13 is provided below the stopper 12, and a central part communicates with the insertion hole 8 of the shaft 7 from above. A valve core body 6 having a hole 9 and an air injection window 10 formed by slitting or the like on the upper side, and a lower end portion of the valve core body 6 fixed by rubber vulcanization. A valve core sub-assembly 15 is constituted by the packing 14, and a shaft 7 having a taper portion 16 for making a line contact with the inner surface of the packing 14 at its lower end is inserted into an insertion hole 8 of the valve core body. The valve core 19 is constructed by inserting the compression coil spring 18 and caulking the upper end of the shaft 7 to form the spring stop portion 17. When the valve core 19 is assembled to the valve stem 1, the tapered surface of the valve stem 1 is formed. 4, the stopper 12 of the valve core body 6 and the packing 14 are brought into contact with each other.

[0007]

[Action]

 In the charge valve of the present invention, when the valve core 19 is inserted into the valve stem 1, and the male thread 11 of the valve core 19 is screwed into the female thread 2 of the valve stem 1, the valve core is attached to the tapered surface 4 provided on the inner surface of the valve stem 1. The stopper 12 of 19 abuts in line contact, and the outer diameter portion of the packing 14 having a smaller outer diameter than the screw 11 of the valve core 19 also abuts on the tapered surface 4, so that airtightness between the two can be maintained.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of the invented charge valve. The inner surface of the valve stem 1 includes a female thread 2, a straight portion 3 below the female thread 2, a tapered surface 4 at the lower end, and a straight opening for air circulation. It consists of part 5 and. The valve core 19 includes a valve core subassembly 15 including a valve core body 6 and a packing 14, a shaft 7 and a spring 18. In the valve core body 6, a screw 11 is formed on the outer surface and a lower portion of the screw 11 has a smaller diameter to form a stopper 12 at a lower end portion thereof, and a packing fitting portion 13 is provided below the stopper 12, and a central portion thereof is provided. An insertion hole 8 for the shaft 7 is provided from above, and a flow hole 9 is provided below the insertion hole 8, and an air injection window 10 formed by slitting or the like is provided on the upper side.

The packing 14 is integrally fixed to the packing fitting portion 13 provided at the lower end of the valve core body 6 by rubber vulcanization, and the outer peripheral part of the packing 14 is the valve stem 1. It is in contact with the tapered surface 4 and has a hole on the inner peripheral surface for forming the valve opening of the valve core. The packing 14 and the valve core main body 6 constitute a valve core sub-assembly 15. The ring-shaped groove 13a provided in the packing fitting portion 13 is for improving the adhesion of rubber during vulcanization.

The shaft 7 is provided at its lower end with a taper portion 16 that makes a line contact with the inner surface of the packing 14, and after the upper end of the shaft 7 is inserted into the insertion hole 8 of the valve core body, A compression coil spring 18 is inserted therein, and the upper end of the shaft 7 is caulked to form a spring stop portion 17 to fix the compression coil spring 18.

Therefore, in the charge valve of the present invention, when the valve core 19 is assembled to the valve stem 1, the stopper 12 of the valve core body 6 abuts on the tapered surface 4 of the valve stem 1 so that the value of the axial end distance L is reduced. It is stable, and the one packing 14 can maintain the airtightness of the valve core and the outer peripheral portion at two locations.

[0012]

[Effect of device]

 In the charge valve of the present invention, when the male thread 11 of the valve core 19 is screwed into the female thread 2 of the valve stem 1, the outer diameter of the packing 14 is smaller than the root diameter of the female 2 of the valve stem 1, so that the packing is Does not damage the seal part. Further, since the stopper 12 of the valve core body 6 contacts the taper surface 4 of the valve stem 1, it is possible to accurately maintain the shaft end distance L that greatly affects the valve opening by the mating coupler (not shown) during gas charging. it can. Further, the outer diameter portion of the packing 14 comes into contact with the tapered surface 4 of the valve stem 1, and it is easy to secure an appropriate deformation amount for the seal of the packing 14. At the same time, the inner diameter of the packing 14 comes into contact with the taper portion 16 of the shaft 7 to maintain airtightness. Therefore, the O-ring 22 and the packing 26, which have been conventionally required, can be completed with one packing 14, resulting in a large number of parts. A charge valve that can be reduced in number and can be provided at low cost can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a charge valve of the present invention.

FIG. 2 is a vertical sectional view showing a conventional charge valve.

[Explanation of symbols]

1 Valve stem 2 Female thread 4 Tapered surface 6 Valve core body 12 Stopper 13 Packing fitting part 14 Packing 15 Valve core sub-assembly 16 Tapered part 19 Valve core L Shaft end distance

Claims (1)

[Scope of utility model registration request] 1. A female thread 2, a straight portion 3, a tapered surface 4, and a straight opening 5 are formed on the inner surface of a valve stem 1 from above, while the outer thread 11 and its lower portion have a small diameter. And a stopper 12 is formed at the lower end thereof, a packing fitting portion 13 is provided below the stopper 12, and an insertion hole 8 and a flow hole 9 for the shaft 7 are provided from above in the central portion and a slit is provided at the upper side portion. A valve core body 6 provided with a window 10 for air injection formed by splitting,
A valve core sub-assembly 15 is constituted by the packing 14 fixed to the lower end of the valve core body 6 by rubber vulcanization, and the taper portion 1 is in line contact with the inner surface of the packing 14.
A shaft 7 having a lower end portion 6 is inserted into an insertion hole 8 of the valve core body, a compression coil spring 18 is inserted in the upper portion of the shaft 7, and the upper end portion of the shaft 7 is caulked to form a spring stop portion 17. A valve core 19 is configured by the above, and when the valve core 19 is assembled to the valve stem 1, the stopper 12 and the packing 14 of the valve core body 6 are brought into contact with the tapered surface 4 of the valve stem 1, valve.