JPH072861U - 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 2, a straight first opening 3, a second female screw 4, a straight second opening 5, a ring-shaped step plane 6 and a straight third inner surface of a valve body 1. The openings 7 are sequentially formed to form a cylindrical valve core body 11
The shaft insertion hole 12 and the fluid injection hole 13, the male screw 14 screwed to the second female screw 4, and the O-ring 15 that closely contacts the second opening 5.
And a ring-shaped flat surface 16 that abuts the step plane 6 and an end face valve seat 18 of the lower end projecting port 17, and a center shaft 21 having a valve body 20 that contacts and separates from the valve seat is attached to the valve core body 11 The valve core 10 is constructed by incorporating the compression coil spring S between the spring stop portion 22 and the valve core body 11 and tightening the valve core to a position where the flat surface 16 contacts the step plane 6. It is characterized in that it is mounted in the main body 1.

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]

 The conventional charge valve disclosed in Japanese Utility Model Laid-Open No. 4-70973 has a first female screw, a straight first opening, a tapered surface, and a smaller diameter than the first opening on the inner surface of the valve body (valve stem) from above. A straight second opening and a second female screw are formed in this order, and a cylindrical valve core body mounted inside this valve body is formed with a shaft insertion hole located at the center of the upper end and a slotting process. Fluid injection hole in the upper part of the main body, a tapered surface that comes into line contact with the tapered surface of the valve main body, an O-ring that is in close contact with the second opening, a male screw that is screwed into the second female screw, and a lower end opening A valve seat formed by a taper surface having a V-shape inside the portion, and a core shaft having a valve body (composed of packing and valve packing receiver) at the lower end for contacting with and separating from the valve seat, Valve core It is installed in the body so that it can move in the axial direction of the main body while protruding upward through the shaft insertion hole, and the center shaft is closed between the spring stop on the upper end of the shaft and the upper surface of the valve core main body. It has a structure in which a compression coil spring that urges to is interposed.

[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 tapered surface of the valve core comes into line contact with the tapered surface of the main body (valve stem), tightening the valve core deforms the tapered surface of the valve body, causing positional variations in the assembly of the valve core. There has been a problem that it is not possible to secure the predetermined assembly dimensions required for opening the charge valve between the spring stop on the upper end of the core shaft and the upper end surface of the valve body.

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 comprises a first female screw 2, a straight first opening 3, a second female screw 4, and a second straight screw on the inner surface of the valve body 1 from above. The opening 5, the ring-shaped step plane 6 and the straight third opening 7 having a smaller diameter than the second opening 5 are sequentially formed. The cylindrical valve core main body 11 mounted in the valve main body 1 is The shaft insertion hole 12 located at the center of the upper end, the fluid injection hole 13 formed in the upper portion of the main body by double-sided width machining, the male screw 14 screwed into the second female screw 4, and the second opening 5 are closely contacted. An O-ring 15, a ring-shaped flat surface 16 that comes into surface contact with and abuts against the step plane 6, and a valve seat 18 formed by the end surface of the lower end projection 17 are provided. A core having a valve body 20 to be separated at the lower end 21 is installed in the valve core main body 11 so as to be movable in the axial direction of the main body while protruding upward through the shaft insertion hole 12, and between the spring stopper portion 22 at the upper end of the shaft and the upper surface portion of the valve core main body 11. A valve core 10 is constructed by interposing a compression coil spring S for urging the center shaft 21 in the valve closing direction, and the valve core 10 is moved to a position where a ring-shaped flat surface 16 contacts the step plane 6. It is characterized by being tightened and mounted in the valve body 1.

[0006]

[Action]

 By configuring the valve body 1 and the valve core body 11 as described above, when the valve core 10 is assembled, the ring-shaped step plane 6 of the valve body 1 and the ring-shaped flat surface 16 of the valve core body 11 come into surface contact with each other. It is possible to easily and accurately secure the predetermined assembly dimension H 1 required for the charge valve opening between the upper end spring stop portion 22 of the center shaft 21 and the upper end surface 1a of the valve body 1.

[0007]

【Example】

 An embodiment of the present invention will be specifically described below with reference to the drawings. In the figure, reference numeral 1 denotes a valve body mounted on a high-pressure side pipe P of an air conditioner or a refrigeration system as shown in FIG. 1 and formed of an aluminum alloy. The inner surface of the valve body 1 has a protective cap (not shown) from above. First female screw 2 for screwing in, a straight first opening 3 that follows the first female screw 2, a second female screw 4 that continues below the first opening 3, and a straight that continues below the second female screw 4 -Shaped second opening 5, a ring-shaped step plane 6 located at the lower end of the second opening 5, and a straight third section having a smaller diameter than the second opening 5 continuing below the step plane 6. The openings 7 are sequentially formed as shown in FIG.

Reference numeral 10 denotes a valve core mounted in the valve body 1. The valve core 10 includes a cylindrical valve core body 11, a center shaft 21 having a valve body 20 at a lower end, and a center shaft 21 for closing the valve. 1 and the inside of the valve body 1 by tightening to a position where a ring-shaped flat surface 16 which will be described later comes into contact with the step plane 6 of the valve body 1. It is installed as shown in 2.

More specifically, the valve core body 11 is formed of a soft metal material such as brass in a cylindrical shape, and the valve core body 11 has a shaft insertion hole 12 located at the center of the upper end and a width across flats. The fluid injection hole 13 formed in the upper portion of the main body by machining as shown in FIG. 2, the male screw 14 screwed into the second female screw 4 of the valve main body 1, and the second opening 5 of the valve main body 1 in sliding contact The valve seat 18 formed by the ring 15 and the fitting groove 15a of the O-ring 15, the ring-shaped flat surface 16 that comes into surface contact with and abuts the step plane 6 of the valve body 1, and the end surface of the lower end protrusion 17 And are provided as shown in FIG.

The center shaft 21 is incorporated into the valve core body 11 so as to be movable in the axial direction of the body while protruding upward through the shaft insertion hole 12, and the spring stopper 22 at the upper end of the shaft is provided. A compression coil spring S that urges the core shaft 21 in the valve closing direction is interposed between the valve core body 11 and the upper surface thereof.

The valve body 20 includes a cap-shaped packing receiver 24 fitted to the downward projecting shaft portion 21 a of the shaft dowel 23, and an annular shape that is internally fitted to and held by the packing receiver 24 and contacts and separates from the valve seat 18. Of the valve packing 25, and the packing receiver 24 is attached to the downward projecting shaft portion 21a by caulking. Further, the spring stop portion 22 is formed by inserting the compression coil spring S into the upwardly projecting shaft portion of the core shaft 21 and then crimping while suppressing the upper end portion of the core shaft 21 from the side surface.

[0012]

[Effect of device]

 The charge valve of the present invention is based on the structure described in the utility model registration claim, and when the valve core 10 is assembled, the ring-shaped step plane 6 of the valve body 1 and the ring-shaped flat surface of the valve core body 11 are assembled. Since the surfaces 16 come into contact with each other in surface contact, a predetermined assembly dimension H required for opening the charge can be easily provided between the upper end spring stop portion 22 of the center shaft 21 and the upper end surface 1a of the valve body 1. It has an excellent practical effect that it can be secured accurately.

[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 sectional view taken along the line AA of FIG.

FIG. 3 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.

[Explanation of symbols]

1 ... Valve main body, 1a ... Upper end surface of valve main body, 2 ... First
Female thread, 3 ... Straight first opening, 4 ... Second female thread, 5 ... Straight second opening, 6 ... Ring-shaped step plane plane, 7 ... Straight third opening, 10 ... Valve core, 11 ... Valve core body, 12 ... Shaft insertion hole, 13 ... Fluid injection hole, 14 ... Male screw, 15 ... O-ring, 15a ... O
Fitting groove of ring, 16 ... Ring-shaped flat surface, 17 ... Lower end protruding port, 18 ... Valve seat, S ... Compression coil spring, 20 ...
Valve body, 21 ... Core shaft, 22 ... Spring stop part, 24 ... Packing receiver, 25 ... Valve packing.

Claims (1)

[Scope of utility model registration request] 1. A first female screw (2), a straight first opening (3), a second female screw (4), and a straight second opening (5) on the inner surface of the valve body (1) from above. ), A ring-shaped step plane (6) and a straight third opening (7) having a smaller diameter than the second opening (5) are sequentially formed, and a cylindrical shape mounted in the valve body (1). In the valve core body (11) of, the shaft insertion hole (12) located at the center of the upper end,
Fluid injection hole (1
3) and a male screw (1) screwed to the second female screw (4).
4) and an O-ring (15) that is in close contact with the second opening (5)
And a ring-shaped flat surface (16) that comes into surface contact with and abuts against the step plane (6), and a valve seat (18) formed by the end surface of the lower end projection (17). Move the core shaft (21) that has the valve body (20) that comes into contact with and separates from the bottom end in the axial direction of the main body while projecting upward through the shaft insertion hole (12) into the valve core main body (11). A compression coil spring (S) that assembles as much as possible and that urges the center shaft (21) in the valve closing direction is provided between the spring stopper (22) at the upper end of the shaft and the upper surface of the valve core body (11). A valve core (10) is formed by interposing the valve core (10), and the valve core (10) is tightened to a position where the ring-shaped flat surface (16) contacts the step plane (6) and mounted in the valve body (1). Become a charge valve.