JPH0712873U - Charge valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a charge valve that can easily secure a predetermined assembly dimension required for opening a charge between the upper end spring stop portion of the core shaft and the upper end surface of the valve body. .. [Structure] A first female screw 22, a straight first opening 23, a ring-shaped step portion plane 24, a straight second opening 25, a second female screw 26, a straight third screw are formed on the inner surface of the valve body 21. The openings 27 are sequentially formed, the shaft insertion hole 41 and the fluid injection hole 36 are formed in the cylindrical valve core main body 31, the ring-shaped flat surface 35 that abuts the step plane 24, and the O-ring that is in close contact with the second opening 25.
38, a male screw 37 that is screwed into the second female screw 26, and a lower end protruding port
A valve body which is provided with an end face valve seat 40 of 39 and is brought into contact with and separated from the valve seat
A core shaft 33 having 32 at its lower end is incorporated in the valve core body 31, and a compression coil spring 34 is interposed between the spring stop portion 42 and the valve core body 31 to form the valve core 30, and the valve core has a flat surface. It is characterized in that it is mounted in the valve body 21 by tightening it to a position where 35 contacts the step plane 24.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a charge valve attached to a pipe of an air conditioner or a refrigeration system for use.

[0002]

[Prior art]

 As shown in FIG. 3, the conventional charge valve disclosed in Japanese Utility Model Laid-Open No. 4-70973 has a first female screw 2, a straight first opening 3, and a tapered surface 4 on the inner surface of the valve body 1 from above. , A straight second opening 5 having a smaller diameter than the first opening 3 and a second female screw 6 are sequentially formed, and a cylindrical valve core body 7 mounted in the valve body 1 has an upper end center. Shaft insertion hole 8, a fluid injection hole 9 formed in the upper portion of the body by double-sided width machining, a tapered surface 10 that comes into linear contact with the tapered surface 4 of the valve body 1, and the second opening 5 An O-ring 11 that is in close contact with the second female screw 6, a male screw 12 that is screwed into the second female screw 6, and a valve seat 13 that is formed by a taper surface that has a V-shape inside the lower end opening. Separated valve body 16 (packing 14 and valve pad A core shaft 17 having a lower end (composed of a kin receiver 15) at the lower end so as to be movable in the axial direction of the main body 1 while protruding upward into the valve core main body 7 through the shaft insertion hole 8. A compression coil spring 19 for urging the core shaft 17 in the valve closing direction is interposed between the spring stopper 18 at the upper end of the shaft and the upper surface of the valve core body 7.

[0003]

[Problems to be solved by the device]

 By the way, in order to reduce the weight of automobile air-conditioning equipment, aluminum materials are often used, and aluminum materials are also often used for charge valves. Since the taper surface 10 of the valve core 20 comes into line contact with the taper surface 4 of the main body 1, the taper surface 4 of the valve body 1 is deformed by the tightening of the valve core, resulting in positional variation in the assembly of the valve core 20, There is a problem that it becomes impossible to secure a predetermined assembly dimension H required for opening the charge between the upper end spring stopper portion 18 of the center shaft 17 and the upper end surface of the valve body 1.

The present invention has been devised in order to solve the above-mentioned conventional problems, and an object thereof is to provide a predetermined valve necessary for opening a charge between a spring stop portion of an upper end of a center shaft and an upper end surface of a valve body. An object of the present invention is to provide a charge valve that can easily secure the assembly dimensions of the charge valve.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the charge valve of the present invention includes a first internal thread 22, a straight first opening 23 continuing from the first internal thread 23, and a straight first opening 23 and a first opening formed on the inner surface of the valve body 21 from above. A ring-shaped step plane 24 located at the lower end, a second straight opening 25 having a diameter smaller than that of the first opening 23 following the step plane, a second female screw 26 following the second opening, and the second female screw. A straight third opening 27 is sequentially formed, and a cylindrical valve core main body 31 mounted in the valve main body 21 is provided with a shaft insertion hole 41 located at the upper end center and a double-sided width processing. The fluid injection hole 36 formed in the upper part of the main body, the ring-shaped flat surface 35 that comes into surface contact with and abuts against the step plane 24, the O-ring 38 that is in close contact with the second opening 25, and the second female screw. With a male screw 37 that is screwed to 26 A valve seat 40 formed by the end face of the lower end projecting port 39 is provided, and a center shaft 33 having a valve body 32 that contacts and separates from the valve seat 40 at the lower end is provided in the valve core body 31 with a shaft insertion hole. It is incorporated so as to be able to move in the axial direction of the main body while protruding upward through 41, and the center shaft 33 is closed in the valve closing direction between the spring stop portion 42 at the upper end of the shaft and the upper surface portion of the valve core main body 341. A valve core 30 is configured with a biasing compression coil spring 34 interposed, and the valve core 30 is mounted in the valve body 21 by tightening it to a position where the ring-shaped flat surface 35 contacts the step plane 24. Is characterized by.

[0006]

[Action]

 By configuring the valve body 21 and the valve core body 31 as described above, when the valve core 30 is assembled, the ring-shaped step plane 24 of the valve body 21 and the ring-shaped flat surface 35 of the valve core body 31 are in surface contact with each other, It is possible to easily and accurately secure the predetermined assembly dimension H required for opening the charge valve between the upper end spring stop portion 42 of the center shaft 33 and the upper end surface 21a of the valve body 21.

[0007]

【Example】

 Hereinafter, one embodiment of the present invention will be specifically described with reference to FIGS. In the figure, reference numeral 21 denotes a valve body formed of an aluminum alloy or the like, and on the inner surface of the valve body 21, a first female screw 22 for screwing a protective cap (not shown) from above, and a straight-shaped female screw 22 continuing therebelow are formed. The first opening 23, a ring-shaped step plane 24 located at the lower end of the first opening 23, and a straight second opening 25 that is below the step plane 24 and has a diameter smaller than that of the first opening 23. A second female screw 26 that follows the second opening 25 and a straight third aperture 27 that follows the second female screw 26 are sequentially formed as shown in FIG.

The lower end of the valve body 21 is attached to the high-pressure side pipe P 1 of the air conditioner or the refrigerating apparatus as shown in FIG. Reference numeral 30 denotes a valve core mounted in the valve main body 21. The valve core 30 has a cylindrical valve core main body 31, a center shaft 33 having a valve body 32 at a lower end, and a center shaft 33 attached in the valve closing direction. A compression coil spring 34 which urges the valve body 21 is tightened up to a position where a ring-shaped flat surface 35, which will be described later, comes into contact with the step plane 24 of the valve body 21, and is mounted in the valve body 21 as shown in FIG. .

More specifically, the valve core body 31 is formed of a soft metal material such as brass in a cylindrical shape, and the valve core body 31 has a shaft insertion hole 41 located at the center of the upper end and a width across flats. The fluid injection hole 41 formed in the upper portion of the main body by processing, the ring-shaped flat surface 35 that comes into surface contact with the step plane 24 of the valve main body 21, and the second opening 25 of the valve main body 21 are brought into sliding contact with each other. As shown in FIG. 2, the O-ring 38 and the fitting groove 38a of the O-ring, the male screw 37 screwed into the second female screw 26 of the valve body 21, and the valve seat 40 formed by the end face of the lower end projecting port 39 are shown in FIG. It is provided.

The center shaft 33 is incorporated in the valve core main body 31 so as to be movable in the axial direction of the main body while protruding upward through the shaft insertion hole 41. A compression coil spring 34 for urging the core shaft 33 in the valve closing direction is interposed between the valve core body 31 and the upper surface thereof.

The valve body 32 is a cap-shaped packing receiver 32b fitted to the downwardly projecting shaft portion 33a of the shaft dowel 43, and is internally fitted to and held by the packing receiver 32b to come into contact with or separate from the valve seat 40. It is composed of an annular valve packing 32a, and the packing receiver 32b is attached to the downward protruding shaft portion 33a by caulking. The spring stop portion 42 is formed by inserting the compression coil spring 34 into the upward protruding shaft portion of the center shaft 33 and then crimping the upper end portion of the center shaft 33 while holding it from the side surface.

In the charge valve having the above structure, the valve core 30 is inserted into the valve body 21 from above, and the male thread 37 of the valve core 30 is screwed into the second female thread 26 of the valve body 21 so that the step plane 24 of the valve body 21 can be secured. Since the valve core 30 is mounted by tightening it to the position where the ring-shaped flat surface 35 of the valve core 30 comes into contact, the distance between the upper end locking portion 42 of the center shaft 33 and the upper end surface 21a of the valve body 21 is required for the charge valve opening. The predetermined assembly dimension H is reached.

When the valve core 30 is inserted into the valve body 21 from above, the male screw 37 of the valve core 30 is below the O-ring 38, so the male screw 37 and the female screw portion 26 corresponding thereto are attached to the O-ring. There is no risk of damaging the O-ring 38 during assembly, as compared with the case where it is provided above.

[0014]

[Effect of device]

 As described above, according to the charge valve of the present invention, when the valve core 30 is assembled, the ring-shaped step plane 24 of the valve body 21 and the ring-shaped flat surface 35 of the valve core body 31 come into contact with each other. A predetermined assembling dimension H 1 required for the charge valve opening can be easily and accurately secured between the upper end spring stop portion 42 of the core shaft 33 and the upper end surface 21a of the valve body 21, and the O-ring 38 can be secured. It has the excellent practical effect of not damaging the

[Brief description of drawings]

FIG. 1 is a central longitudinal sectional view showing a charge valve according to an embodiment of the present invention.

FIG. 2 is a central longitudinal sectional view showing the charge valve of the present invention in an exploded state of a valve body and a valve core.

FIG. 3 is a central longitudinal sectional view showing a conventional charge valve.

[Explanation of symbols]

21 ... Valve body, 21a ... Upper end surface of the body, 22 ... First
Female thread 23, straight first opening 24, ring-shaped step plane, 25 second straight opening 26
... second female screw, 27 ... straight third opening, 30
... Valve core, 31 ... Valve core body, 32 ... Valve body, 3
2a ... Valve packing, 32b ... Packing receiver, 33 ... Core shaft, 34 ... Compression coil spring, 35 ... Ring-shaped flat surface,
36 ... Fluid injection hole, 37 ... Male screw, 38 ... O-ring, 3
8a ... O-ring fitting groove, 39 ... Lower end protruding port, 40 ... Valve seat, 41 ... Shaft insertion hole, 42 ... Spring stop part.

Claims (1)

[Scope of utility model registration request] 1. A valve body (21) having an inner surface having a first female screw (22) from above, a straight first opening (23) following the first female screw, and a ring located at the lower end of the first opening. -Shaped step plane (24), the first opening (2
3) A second straight opening (25) with a smaller diameter, the second
A second internal thread (26) following the opening and a straight third opening (27) following the second internal thread are sequentially formed, and the cylindrical valve core body (31) is mounted in the valve body (21). ), A shaft insertion hole (41) located at the center of the upper end, and a fluid injection hole (36) in the upper part of the main body formed by double-sided width processing.
A ring-shaped flat surface (35) that comes into surface contact with and abuts the step plane (24), an O-ring (38) that is in close contact with the second opening (25), and the second female screw (26). A male screw (37) to be screwed into the valve seat and a valve seat (40) formed by the end face of the lower end projecting opening (39) are provided, and a valve body (32) that contacts and separates from the valve seat (40) is provided at the lower end. The core shaft (33) is assembled into the valve core body (31) so as to be movable in the axial direction of the main body while protruding upward through the shaft insertion hole (41). A compression coil spring (34) for urging the center shaft (33) in a valve closing direction is interposed between the valve core (42) and the upper surface of the valve core body (31) to form a valve core (30). The valve core (30) is mounted in the valve body (21) by tightening it until the ring-shaped flat surface (35) contacts the step plane (24). Jibarubu.