JPS6312279Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a ball valve for controlling the flow of fluid, particularly refrigerant in a refrigeration system.

Prior Art When a conventional ball valve is used as a valve for connecting pipes between indoor and outdoor units of a refrigeration system, particularly a separate type refrigeration system, the following problems have been encountered. In other words, the air remaining in the valve chamber cannot be removed regardless of whether the ball valve is opened or closed, and the refrigerant is trapped in the valve chamber as the valve opens or closes, and the liquid refrigerant evaporates by the temperature difference with the outside. There was a risk that the gas refrigerant would condense and contract, and the volume change could damage the seal.

Therefore, as a method generally used as a countermeasure against this problem, the number 1 shown in Fig. 3 (Utility Model Application Publication No. 57-121460)
There is a method in which a pressure equalizing hole is bored perpendicularly to the through hole 10 of the ball 3 shown at 5'. However, since this pressure equalizing hole 15' communicates with the outer surface of the ball 3, unless the part communicating with the outer surface is finished sufficiently smooth, there is a risk of damaging the valve seat 4 when the ball 3 rotates. Moreover, when drilling the pressure equalizing hole 15', care must be taken to avoid damaging the outer surface of the ball 3, which poses a problem in terms of workmanship.

Also, the code 1 in Figure 4 (Utility Model Application No. 57-122866)
There is also a method of drilling a pressure equalizing groove in the nut 2 indicated by 5'', but this pressure equalizing groove 15'' must be machined with a milling cutter or the like, which is not very desirable as it increases the cost.

Purpose The purpose of the present invention is to solve the above problems and provide a ball valve that is extremely easy to process and assemble, and that can eliminate the accumulation of air and liquid refrigerant in the valve chamber. It is something to do.

Configuration The present invention includes a main body that is open at one end and communicates with a passageway to form a valve chamber therein, a nut that is screwed onto the inner periphery of the opening of the main body and communicates with the passageway, and a nut that is screwed onto the inner periphery of the opening of the main body and communicates with the passageway. A ball that is housed in a room, is rotatably supported by a rotation shaft passing through the main body, and opens and closes the two passages through a through hole bored inside, and between the main body, the nut, and the ball. In a ball valve consisting of a ring-shaped valve seat arranged in
A valve seat washer, which is comprised of an annular part and a cylindrical part protruding from the outer periphery of the annular part toward the ball, is provided in the main body or nut, and accommodates the valve seat, and a spring that presses the valve seat washer toward the ball. At the same time, the valve seat washer is provided with a continuous L-shaped notch in its annular portion and cylindrical portion, and the valve chamber is communicated with either of the two passages, whereby air inside the valve chamber is This prevents refrigerant from accumulating and damaging the valve seat.

Embodiment The present invention will be described in detail below based on an embodiment shown in FIG. 1 and FIGS. 2A and 2B.

In the figure, 1 is the main body of the ball valve, one end of the main body 1 has an opening 5, the other end communicates with a passage 8 that communicates with an indoor unit (not shown) of an air conditioner, and a valve chamber 6 inside. is formed. A ball 3 having a through hole 10 formed therein is housed in the valve chamber 6, and the ball 3 is rotated by a rotation shaft 9 that extends through the main body 1 and is rotatably supported. The passage 8 and the passage 7 of the nut 2, which will be described later, are opened and closed by the through hole 10.

Here, 16 is a pipe connected to the indoor unit of the air conditioner, 17 is a flare nut that connects the pipe 16 to the main body 1, 18 is a refrigerant filling port for filling the indoor/outdoor unit with refrigerant, and 19 is a rotating shaft 9 that rotates. The valve cover 20 that covers the main body 1 when not moving is an O-ring that maintains airtightness between the main body 1 and the rotating shaft 9.

The nut 2 has one end screwed onto the inner periphery of the opening 5 of the main body 1, and by bringing the edge portion 23 of the nut 2 into contact with the slope portion 21 at the end of the opening 6 of the main body 1 with an appropriate sealing pressure, the nut 2 is fitted with a wax. A passage 7 of the piping 24 attached to the air conditioner and connected to the outdoor unit (not shown) of the air conditioner
Also, the refrigerant flowing through the passage 8 is prevented from leaking to the outside.

4 is a valve seat made of tetrafluoroethylene resin provided on both sides of the ball 3, and the main body 1
The side valve seat 4 has a recess 22 facing the valve chamber 6 of the main body 1.
The valve seat 4 on the nut 2 side is
Two ring-shaped leaf springs 12 are housed in a valve seat washer 11 (to be described later) that is loosely fitted into a recess 25 facing the valve chamber 6 of the nut 2, and are interposed between the nut 2 and the valve seat washer 11. , 12 (see FIG. 2A) toward the ball 3, and sealing is performed by both valve seats 4, 4.

The valve seat washer 11 is a feature of the present invention, and as shown in FIG.
When forming the cylindrical portion 14 protruding from the outer periphery of the
An L-shaped notch 15 with a small width continuous with the annular part 13 and the cylindrical part 14 is simultaneously machined, and the valve seat 4 is housed in the cylindrical part 14, so that the force of the spring 12 is applied locally to the valve seat 4. When assembled into a valve, the notch 15 allows the valve chamber 6 to communicate with the passage 7 to function as a pressure equalizing passage.

In addition, in the above embodiment, the valve seat washer 1
1 and the spring 12 are housed in the recess 25 of the nut 2, but they may also be housed inside the main body 1.

Effects Since the present invention is constructed as described above, special equalizing holes 15' and pressure equalizing grooves 15'' for equalizing pressure are added to the ball (Fig. 3) and nut (Fig. 4) as in the conventional device. A simple notch 1 is provided in the valve seat washer 11 that uniformly presses the valve seat 4 against the ball 3 without the need for machining.
By drilling 5, the valve chamber 6 can be communicated with either one of the two passages 7 and 8 to equalize the pressure, so there is no need to eliminate air retention in the valve chamber 6. In addition, the refrigerant is confined in the valve chamber 6, and there is no risk of the liquid refrigerant evaporating and expanding due to the temperature difference with the outside air, or the gas refrigerant condensing and contracting, and damaging the valve seat 4 due to the change in volume. It has a remarkable effect that it can be eliminated.

[Brief explanation of the drawing]

1 and 2A and 2B show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2A is a detailed explanatory view of part A in FIG. 1, and FIG. B-B in Figure 2 A
The plan view of the valve seat washer taken along the line, and FIGS. 3 and 4 are longitudinal sectional views of the conventional device. 1... Body, 2... Natsu, 3... Ball, 4
...Valve seat, 5...Opening, 6...Valve chamber, 7...
Passage, 8... Passage, 9... Rotating shaft, 10... Through hole, 11... Valve seat washer, 12... Spring, 13
...Annular part, 14...Cylindrical part, 15...Notch.

Claims (1)

[Scope of utility model registration request] a main body 1 having one end open and the other end communicating with a passage 8 to form a valve chamber 6 therein; a nut 2 screwed into the inner periphery of the opening 5 of the main body 1 and communicating with the passage 7;
A ball is housed in the valve chamber 6, is rotatably supported by a rotation shaft 9 passing through the main body 1, and opens and closes the two passages 7 and 8 through a through hole 10 bored inside. 3, a ring-shaped valve seat 4 disposed between the main body 1, the nut 2, and the ball 3;
4, in which the main body 1
Alternatively, a valve seat washer 1 includes an annular portion 13 in the nut 2 and a cylindrical portion 14 protruding from the outer periphery of the annular portion 13 toward the ball 3, and accommodates the valve seat 4.
1 and a spring 12 that presses the valve seat washer 11 in the direction of the ball 3.
A ball valve characterized in that a continuous L-shaped notch 15 is provided to communicate the valve chamber 6 and the passage 7 or 8.