JPH09112726A - Valve core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure of a shaft by making a guide function in a mouth section of a valve core main body due to dowel formed in the shaft function by a rubber packing. SOLUTION: A valve core is constituted by providing an insertion hole 9 of a shaft 8 and a window 10 for supplying air at the center at an upper end of a valve core main body 7, providing a tapered face 11, an O ring 12, and a male screw 13 on an outer face thereof, providing a tapered face 14 in such shape that its lower section is opened more widely than its upper section in a lower end section on an inner face thereof, inserting the shaft 8 in which a cylindrical packing 18 is fitted into the insertion hole 9 of the valve core main body, and fixing a compression coil spring 17 in a spring locking section 16 in an upper end section of the shaft. In this case, a valve packing receiver 19 is integrally provided in a lower end section of the shaft 8, and the packing 18 consisting of a guide section 18a and a packing section 18c is fitted in a top face of the valve packing receiver. Moreover, a recessed section 18b in the vertical direction which reduces in flow resistance of refrigerant is provided in the guide section 18a of the packing 18.

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 valve core of a charge valve suitable for an air conditioner of an automobile, and more particularly to a guide function of a valve core main body opening portion formed by a dowel formed on a conventional shaft by a rubber packing. Thus, the present invention relates to a valve core in which the shaft structure is simplified and the cost of parts can be reduced.

[0002]

2. Description of the Related Art FIG. 2 is a vertical sectional view of a conventional charge valve disclosed in Japanese Utility Model Publication No. 7-33097.
This charge valve consists of a valve stem 1 and a valve core 2.
It is configured in combination with 0. The valve stem 1 includes an internal thread 2 for screwing a protective cap into the inner surface of the valve stem 1 from above, a tapered surface 4 following the lower end of a straight opening 3 below the sliding surface of an O-ring 12. A straight opening 5 and a female screw 6 for mounting the valve core 20 are sequentially formed and provided.

The valve core 20 is composed of a valve core body 7 having a reverse bottomed cylindrical shape, a shaft 8 and a compression coil spring 17. The valve core main body 7 having a reverse bottomed cylindrical shape is provided with an insertion hole 9 for the shaft 8 and an air injection window 10 formed by slotting at the center of the upper end, and the upper portion of the outer surface is provided with the above-mentioned structure. Tapered surface of valve stem 4
The taper surface 11 having an angle larger than the taper angle is formed, and the two are brought into line contact with each other so as to contact each other to fix the valve core 20 and maintain the airtightness of both. An O-ring 12 is provided below the tapered surface 11.
Is fitted and provided, and a screw 13 is provided below it. In addition, a C-shaped tapered surface 14 is provided at the lower end of the inner surface of the valve core body 7 for contacting a cylindrical valve packing 18 described later.

The shaft 8 has a cylindrical valve packing 18 fitted between the dowel 15 formed in the middle portion and the valve packing receiver 19 formed at the lower end by press fitting from above the shaft. The shaft core 8 is inserted into the insertion hole 9 of the valve core body, and then the compression coil spring 17 is inserted into the shaft to position the compression coil spring 17 on the upper surface of the valve core body 7. By caulking, the spring stop portion 16 is formed, and the upper surface of the tapered surface 14 of the valve core body 7 and the valve packing 18 is kept airtight. The dowel 15 guides the mouth of the lower end of the valve core body.

[0005]

The valve core 20 of the conventional charge valve has the dowel 1 forming the guide portion.
5 is formed integrally with the shaft 8. Therefore, since it is extremely difficult to press work such as cold forging, cutting work must be performed. However, the cutting cost is not only expensive, but also the material yield is extremely low. Moreover, since the clearance between the outer diameter of the dowel 15 and the mouth of the valve core body is small, the flow resistance is large and a long time is required when the refrigerant gas is filled.

[0006]

According to the present invention, when the dowel 15 formed on the shaft 8 of the conventional valve core is abolished, the valve packing 18 fitted on the upper surface of the valve packing receiver 19 at the lower end of the shaft is guided. It is an object of the present invention to provide a valve core in which the structure of the shaft is simplified and the cost of parts can be reduced by configuring the shaft core 18a and the packing portion 18c. Further, the guide portion 1 of the valve packing 18
8a includes a vertical recess 18b for reducing the inflow resistance of the refrigerant.
Is provided.

That is, the first invention of the valve core 20 according to the present invention is for injecting air which is formed by slitting the insertion hole 9 of the shaft 8 in the center of the upper end of the valve core body 7 having a reverse bottomed cylindrical shape. A window 10 is provided, a tapered surface 11 is provided on an upper portion of an outer surface of the valve core body 7, an O-ring 12 is provided at an intermediate position of the outer surface, and a male screw 1 is provided at a lower portion of the outer surface.
3 and a taper surface 14 in a V shape at the lower end of the inner surface.
The shaft 8 formed by fitting a cylindrical valve packing 18 is inserted into the insertion hole 9 of the valve core body, and the upper surface of the valve core body 7 is connected to the spring stop portion 16 at the upper end of the shaft. In a valve core having a compression coil spring 17 provided therebetween, a valve packing receiver 19 is integrally provided at the lower end of the shaft 8 and a guide portion 18a is provided on the upper surface of the valve packing receiver.
It is characterized in that a valve packing 18 including a packing part 18c and a packing part 18c is fitted.

The second invention is that the valve packing 18 is
The guide portion 18a is provided with a vertical recess 18b for reducing the inflow resistance of the refrigerant.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of a valve core of the present invention. The valve core 20 is composed of a valve core main body 7 having a reverse bottomed cylindrical shape, a shaft 8 and a compression coil spring 17, but since the valve core main body 7 and the compression coil spring 17 are completely the same as the conventional product, this portion will be omitted. The detailed description of is omitted.

The shaft 8 of the valve core according to the present invention is
A valve packing receiver 19 is integrally formed at the lower end.
Therefore, since it has a simple structure, press working such as cold forging can be used, and the yield of the material is good as compared with the conventional cutting work, which is extremely easy and
It can be produced at low cost.

The valve packing 18 has a guide portion 18a.
And a packing portion 18c, and the guide portion 18a serves to guide the dowel 15 in the conventional product.

FIG. 2 is a perspective view showing another embodiment of the packing according to the present invention. The guide part 18a of the valve packing 18 has a vertical direction in order to reduce the inflow resistance at the time of charging the refrigerant. There are several recesses 18b.

[0013]

In the valve core of the present invention, since the shaft 8 has a simple structure, it is possible to use press working such as cold forging, which is easier than the conventional cutting work. In addition, since the yield of the material is remarkably improved, it can be produced at low cost.

A guide portion 18a of the valve packing 18 is also provided.
In addition, since several vertical recesses 18b are provided to reduce the inflow resistance when the refrigerant is charged, the refrigerant charging time can be significantly reduced.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing another embodiment of the packing according to the present invention.

FIG. 3 is a vertical sectional side view showing a conventional charge valve.

[Explanation of symbols]

7 Valve core body 8 axes
9 Insertion hole 10 Air injection window 11 Tapered surface
12 O-ring 13 Male thread 14 C-shaped tapered surface 16 Spring stop portion 17 Compression coil spring 18 Cylindrical packing 18a Guide portion 1
8b Vertical recess 18c Packing part 19 Valve packing
20 valve cores.

Claims (2)

[Claims] 1. An inverted-bottomed tubular valve core main body 7 is provided with an insertion hole 9 for a shaft 8 and an air injection window 10 formed by slitting in the center of the upper end of the valve core main body 7. A tapered surface 11 is provided on the upper part, an O-ring 12 is provided at an intermediate position on the outer surface, and a male screw 1 is provided on the lower part of the outer surface.
3 and a taper surface 14 in a V shape at the lower end of the inner surface.
The shaft 8 formed by fitting a cylindrical valve packing 18 is inserted into the insertion hole 9 of the valve core body, and the upper surface of the valve core body 7 is connected to the spring stop portion 16 at the upper end of the shaft. In a valve core having a compression coil spring 17 provided therebetween, a valve packing receiver 19 is integrally provided at a lower end portion of the shaft 8 and a valve packing composed of a guide portion 18a and a packing portion 18c is provided on an upper surface of the valve packing receiver. A valve core in which 18 is fitted. 2. A guide portion 18a of the valve packing 18 includes:
The valve core according to claim 1, further comprising a vertical recess 18b that reduces the resistance to the inflow of the refrigerant.