JP2589809Y2 - Charge valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a charge valve suitable for charging a refrigerant in a vehicle air conditioner.

[0002]

2. Description of the Related Art FIG. 2 is a longitudinal sectional view of a conventional charge valve (a tire valve in the publication) disclosed in Japanese Utility Model Laid-Open Publication No. Sho 59-144269. It is constituted by a combination of the valve stem 1 and the valve core 19. The valve stem 1 is provided with a screw on the upper surface of the outer surface thereof, and is provided with an opening 3 and a female screw 21 which are successively elongated in the inner surface thereof.
8 are made. The valve core 19 includes an inverted bottomed cylindrical valve core body 6, a shaft 7, and a compression coil spring 18.

The inverted bottomed tubular valve core body 6 is provided with an insertion hole 8 of a shaft 7 and a window 10 for air injection formed by slitting at the center of the upper end.
An O-ring 22 and a male screw 23 are provided on the outer side surface, and a C-shaped tapered surface 24 is provided at the center of the lower end portion 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. The compression coil spring 18 is positioned on the upper surface of the valve core body 6 by inserting the insertion hole 18 into the shaft, and the upper end of the shaft is swaged to form the spring stopper 17.
Is formed. Therefore, the female screw 2 of the valve stem 1
When the male screw 23 of the valve core is screwed into the valve core 1, the lower end 29 of the valve core is brought into contact with the step 28 of the valve stem to fix the valve core 19.

[0004]

In the conventional charge valve, when the valve core 19 is to be screwed into the valve stem 1 strongly, the step 28 of the valve stem is strongly pressed by the lower end 29 of the valve core. There is a problem that the portion 28 is deformed or its end is broken. Also, the valve core 19 and the valve stem 1
Is caused by the O-ring 22, but the large resistance at the time of insertion of the O-ring sometimes damages the O-ring,
There was a problem that impaired airtightness. Also, since the valve core 20 has a large number of parts and requires many processing steps,
There was a problem that the cost was high.

[0005]

In order to solve the above-mentioned problems, the present invention has been used to maintain the airtightness between the valve port of the conventional valve core 19 and the valve core 19 and the valve stem 1. O-ring 22 and packing 26
Can be replaced with a single packing 14 formed by rubber vulcanization at the lower end of the valve core sub-assembly 15 to greatly reduce the number of parts, and at the time of gas charging by a stopper provided on the outer side of the valve core body 9. An object of the present invention is to provide a charge valve capable of accurately securing a shaft end distance L that greatly affects valve opening by a mating coupler (not shown).

That is, in the charge valve of the present invention, a female screw 2, a straight portion 3, a tapered surface 4, and a straight opening 5 are formed on the inner surface of the valve stem 1 from the upper side. A screw 12 and a lower portion thereof are formed to have a small diameter to form a stopper 12 at a lower end portion.
A packing fitting portion 13 is provided below, and an insertion hole 8 and a flow hole 9 of the shaft 7 are provided from above in the center portion, and a window 10 for air injection formed by slitting or the like is provided on the upper side portion. A valve core sub-assembly 15 is constituted by the valve core body 6 provided and a packing 14 fixed to the lower end of the valve core body 6 by rubber vulcanization, and a tapered portion 16 which makes line contact with the inner surface of the packing 14 is formed at the lower end. The valve core 19 is inserted into the insertion hole 8 of the valve core body, the compression coil spring 18 is inserted into the upper part of the shaft 7, and the upper end of the shaft 7 is caulked to form the spring stopper 17. The valve core 19 and the valve stem 1
When assembled, the stopper 12 and the packing 14 of the valve core body 6 come into contact with the tapered surface 4 of the valve stem 1.

[0007]

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 and mounted, the tapered surface provided on the inner surface of the valve stem 1. 4 to valve core 1
The stoppers 9 of the packing 9 come into contact with each other by line contact, and the outer diameter of the packing 14 having a smaller outer diameter than the screw 11 of the valve core 19 also comes into contact with the tapered surface 4 so that the airtightness between the two can be maintained.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of the invented charge valve,
The inner surface of the valve stem 1 includes a female screw 2, a straight portion 3 thereunder, a tapered surface 4 at a lower end, and a straight opening 5 for air flow. Valve core 19
Is composed of a valve core sub-assembly 15 including a valve core body 6 and a packing 14, a shaft 7 and a spring 18. The valve core body 6 has a screw 11 on the outer surface and a stopper 12 at the lower end with a small diameter below the screw 11 and a packing fitting portion 13 below the stopper 12. An insertion hole 8 of the shaft 7 and a flow hole 9 below the insertion hole 8 are provided from above, and an air injection window 10 formed by slitting or the like is provided on the upper side.

A packing 14 is integrally fixed to a packing fitting portion 13 provided at a lower end portion of the valve core body 6 by rubber vulcanization, and an outer peripheral portion of the packing 14 is formed of the valve stem 1. The inner peripheral surface is provided with a hole for forming a valve port of the valve core. The packing 14 and the valve core 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 tapered portion 16 which makes line contact with the inner surface of the packing 14.
After the upper end of is inserted into the insertion hole 8 of the valve core body,
A compression coil spring 18 is inserted in the upper part, and the upper end of the shaft 7 is caulked to form a spring stopper 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 comes into contact with the tapered surface 4 of the valve stem 1, so that the value of the shaft end distance L is reduced. Stable,
In addition, one packing 14 can maintain airtightness at two locations, that is, a valve port and an outer peripheral portion of the valve core.

[0012]

According to the charge valve of the present invention, when the male screw 11 of the valve core 19 is screwed into the female screw 2 of the valve stem 1 for mounting, the outer diameter of the packing 14 is
Since it is smaller than the root diameter of the female screw 2, the seal portion of the packing is not damaged. Further, since the stopper 12 of the valve core body 6 abuts on the tapered surface 4 of the valve stem 1, the shaft end distance L, which greatly affects valve opening by a mating coupler (not shown), can be accurately maintained during gas charging. . Further, the outer diameter of the packing 14 abuts on the tapered surface 4 of the valve stem 1, so that an appropriate amount of deformation for sealing the packing 14 can be easily secured. At the same time, the inner diameter of the packing 14 is
In order to maintain the airtightness by contacting the tapered portion 16 of the above, since the O-ring 22 and the packing 26, which have been required conventionally, are completed by one packing 14, the number of parts can be greatly reduced and an inexpensive charge valve is provided. be able to.

[Brief description of the drawings]

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

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

[Explanation of symbols]

DESCRIPTION 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 Taper part 19 Valve core L Shaft end distance

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F25B 45/00

Claims (1)

(57) [Scope of request for utility model registration] 1. An internal 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 the upper side, while a screw 11 and a small diameter are formed on an outer surface thereof. A stopper 12 is formed at the lower end, a packing fitting portion 13 is provided below the stopper 12, an insertion hole 8 and a flow hole 9 for the shaft 7 are provided at the center from above, and a slot is provided at the upper side. A valve core body 6 having an air injection window 10 formed by splitting or the like;
A valve core sub-assembly 15 is constituted by a packing 14 fixed to the lower end of the valve core body 6 by rubber vulcanization, and the tapered portion 1 which makes line contact with the inner surface of the packing 14.
A shaft 7 having a lower end 6 is inserted into an insertion hole 8 of the valve core body, a compression coil spring 18 is inserted into an upper portion of the shaft 7, and an upper end of the shaft 7 is caulked to form a spring stopper 17. The valve core 19 is constituted by the following. 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 come into contact with the tapered surface 4 of the valve stem 1. valve.