JP3259951B2 - Valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device such as a closing valve and an opening / closing valve which is interposed mainly in a refrigerant piping system of a refrigerator / air conditioner.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, an on-off valve of this type has a valve stem L screwed into a valve housing D having a refrigerant passage R via a screw portion N. Burl part K for retaining part
By removing the hexagonal nut type valve cover C covered on the side, inserting a wrench into the operating portion W of the valve stem L and rotating it, the valve head H integrated with the head of the valve stem L is attached to the valve housing D. Valve seat S formed in
And the communication pipe J connected to the compressor side and the external pipe connected to the flare nut F side communicate with each other.

After the passage R is opened, the valve cover C is again opened.
And tightly tightened to bring the inner annular edge portion E into pressure contact with the top annular tapered surface T of the valve housing D, assist the O-ring O on the outer periphery of the valve rod L, and maintain the sealing performance in a double manner. External leakage is reduced as much as possible. In FIG. 5,
B is a valve core, and P is a service port blind lid.

[0004]

However, in the above-described method, the valve seat S needs to be worked on the valve housing D, and there is a problem that the cost increases accordingly. A valve head D is attached to the valve housing D.
Is formed, the valve stem L is inserted from the opposite side of the valve head, that is, the valve lid C, and is incorporated therein, and the valve stem L is inserted into the insertion port end on the opposite side of the valve head. It is necessary to form the retaining burr portion K for preventing the removal of the material by caulking or the like, and there is a problem that the structure is further complicated.

[0005] A main object of the present invention is to provide a valve device capable of improving workability and simplifying the structure and realizing cost reduction.

[0006]

According to the first aspect of the present invention,
In order to achieve the above-mentioned main purpose, as shown in FIGS.
In the valve device is seated or separated on the valve seat 8, before
The entirety of the valve housing 2 is formed of a pipe at the base and inserted into the base.
Connection with large diameter part 72 to be inserted and small diameter part 71 at the tip
The pipe 7 is connected, and the small-diameter portion 71 in the connection pipe 7 is connected.
A valve seat 8 on which the valve head 11 is seated is formed on the inner edge of the end . 1 to 4, the closing valve of the type in which the valve head 11 is integrally provided on the head of the valve stem 1 is shown, but a closing valve and an opening / closing valve of a type in which a separate valve head is linked to the valve stem 1 , A switching valve or the like.

According to the second aspect of the present invention, the connecting pipe 7 is made of a material having a lower hardness than the material of the valve head 11 in order to improve the bite of the valve seat 8 and to improve the sealing property in the valve closed state. Consisting of: For example, the connection pipe 7 is a copper pipe, the valve head 1
1 is formed of a brass material. Of course, other combinations having other hardness differences may be adopted.

[0008]

According to the first aspect of the present invention, FIGS.
As shown in (1), since the valve seat 8 is formed on the end face of the connection pipe 7, it is not necessary to process the valve seat in the valve housing 2. or,
Since the valve seat 8 is not formed in the valve housing 2, there is no restriction that the opposite valve head side of the valve housing 2 must be used as an insertion port of the valve stem 1. If the connection pipe 7 is attached afterwards, it is not necessary to caulk the retaining burr later and the removal of the valve stem 1 can be easily prevented.

According to the second aspect of the present invention, since the connecting pipe 7 is made of a soft material having a lower hardness than the valve head 11, the force of the valve head 11 at the valve seat 8 can be sufficiently increased, and the valve seat 8 can be made sufficiently large. Even if there is a slight misalignment between the valve head 11 and the valve head 11, the misalignment can be easily corrected and the two can be brought into close contact with each other, so that the sealing performance can be improved satisfactorily.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a valve stem 1 has a frusto-conical valve head 11, a cylindrical portion 12 with a thread, a cylindrical portion 13 of Muku, an annular groove 14 in which an O-ring 10 is interposed. It has a frusto-conical annular tapered surface portion 40 serving as the one-side pressure contact portion 4, an operation confirmation portion 6 for confirming the open / closed state of the valve, and an operation portion 60 including a hexagonal wrench hole inside the operation confirmation portion 6. The material is made of brass or the like.

The valve housing 2 comprises a receiving cylinder 21 of the valve stem 1 and a base 2.
2. An external pipe joint 23 and a service port 24 are provided, and an L-shaped passage 3 is formed in the inside thereof.
The material is also made of brass or the like. Top hole 2 of receiving cylinder 21
5 has a smaller diameter than the receiving hole 26 of the valve stem 1, and forms an annular edge portion 50 which becomes the other-side press-contact portion 5 on the lower inner edge thereof. The screw portion 27 screwed with the threaded cylindrical portion 12 of the valve stem 1 is formed by inserting a processing tool from the base portion 22 side.
The valve stem 1 is received from the base 22 side and incorporated therein.
After the valve stem 1 is inserted, the connection pipe 7 connected to the compressor-side pipe is inserted into the base 22 and brazed 70. As shown in FIG. 3, a flanged hemispherical closing tool 91 for closing the opening of the passage 3 when the pipe is not connected is fixed to the external pipe joint 23 with a flare nut 92. A valve core 93 is attached to the service port 24.

The connection pipe 7 communicating with the compressor side is entirely formed of a copper pipe, and has a small-diameter portion 71 at the end, a large-diameter portion 72 at the middle,
It consists of a terminal small diameter portion 73. The inner edge of the end of the tip small diameter portion 71 is used as a valve seat 8 on which the valve head 11 is seated. The pressure contact between the relatively soft copper material on the valve seat 8 side and the brass material on the valve head 11 side, which is harder than this, causes the valve head 11 to bite into the inner edge of the end portion of the connection pipe 7 serving as the valve seat 8, thereby providing a favorable condition. A valve-closed seal state is obtained.

At the end of the installation work of the air conditioner, FIGS.
The valve rod 1 is rotated with a wrench from the valve closed state of
To bring the valve open as shown in FIGS. At this time, the annular tapered surface portion 40 of the valve stem 1 rotates while the valve housing 2 is rotated.
It is firmly pressed against the side annular edge portion 50 and adheres tightly over the entire circumference. Therefore, the O-ring 10 can be assisted to double maintain the sealing property for a long period of time, and external leakage of the refrigerant gas can be prevented. Further, due to the pressure contact force at the annular tapered surface portion 40 and the edge portion 50, the engagement force of the screw engagement portion between the valve stem 1 and the valve housing 2 is increased, and the engagement and disengagement of the valve stem 1 due to vibration or the like can be prevented. Further, in the valve open state, the operation confirmation unit 6 protrudes greatly from the top of the valve housing 2 (FIG. 2), and the difference from the valve closed state (FIG. 4) becomes clear at a glance, and the confirmation work becomes easy.

[Brief description of the drawings]

FIG. 1 is a sectional view of a valve device of the present invention in a valve open state.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a cross-sectional view of the valve device in a valve closed state.

FIG. 4 is an enlarged sectional view of a main part of FIG. 3;

FIG. 5 is a sectional view of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; Valve stem 11; Valve head 2; Valve housing 7; Connection pipe 8;

Continuation of the front page (56) References JP-A-56-35867 (JP, A) JP-A-61-75569 (JP, U) JP-A-57-186752 (JP, U) JP-A-6-69532 (JP) , U) Actually open 1979--24784 (JP, U) Actually open 1981-30663 (JP, U) Actually open 1979-50-93624 (JP, U) Actually open 1979-16930 (JP, U) Actually open 7-10643 (JP, U) JP-A 57-25272 (JP, U) JP-A 52-12964 (JP, Y1) JP-A 51-1090 (JP, Y1) JP-A 57-58470 (JP, U Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 1/00-1/54 F16K 27/00-27/12

Claims (2)

(57) [Claims] 1. A valve device in which a valve head (11) is seated or separated from a valve seat (8) by a reciprocating movement of a valve stem (1) to be rotated with respect to a valve housing (2).
The whole is formed of a tube and inserted into said base
Connection pipe having a diameter part (72) and a small diameter part (71) at the tip
(7) to connect the small diameter of the connecting pipe (7).
The valve head (11) is seated on the inner edge of the end of the portion (71).
Valve device being characterized in that formed that the valve seat (8). 2. The valve device according to claim 1, wherein the connecting pipe is made of a material having a lower hardness than a material of the valve head.