KR20170052157A - Service valve for type of packing sealing - Google Patents

Abstract

The present invention relates to a packing sealing type service valve comprising a main body and a valve stem. In the main body, a first flow path and a second flow path for fluid movement are branched and interconnected, first and second pipes are respectively connected to the first and second flow paths, and a third flow path is formed at an upper portion of the second flow path to be connected to the same. The valve stem is inserted to have the interconnected first and second flow paths opened and closed only by contact with and release from a stepped portion, a border portion of the second and third flow paths, and moving on the third flow path. A packing provided on a lower surface of the valve stem contacts the stepped portion to close the first and second flow paths, and is released to open the first and second flow paths.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

[0001] The present invention relates to a packing sealing type service valve, and more particularly, to a packing sealing type service valve, which comprises a sealing means at the lower part of a valve stem which is a service valve opening / closing device for opening and closing a fluid, And more particularly, to a packing sealing type service valve configured to have a sealing effect superior to that of a valve.

Generally, the service valve is used as a connection to a refrigerant circulation line, and is a kind of a valve for supplementing or supplying refrigerant or freezing oil circulating in an air conditioner or a refrigerating machine.

Specifically, a main body of a service valve for a general cooler is usually provided with an installation bracket on its outer side, and the structure of the inner pipe is formed so that three or four passages communicate with each other. In addition, the branch tube composed of the respective passages is constituted of independent branch tubes and is composed of four passages of the core installation tube, the spindle installation tube, and the first and second supply tubes. A valve stem is inserted in the refrigerant inlet port to prevent the refrigerant charged during charging from flowing backward, and a connection port is formed at the end to connect the charger. The spindle mounting pipe is generally configured such that a spindle is inserted and threaded, and a flow path of the first supply pipe and the second supply pipe is selected by a mutual rotational action with an internal screw formed in the valve body.

1. Korean Patent No. 10-1394790 2. Korean Patent No. 10-1509722

Patent Document 1 discloses a service valve that simplifies the structure to facilitate processing and prevents leakage of refrigerant even when a large pressing force acts on the sealing member and prevents leakage when the valve is in contact with the inside of the main body. .

Specifically, referring to FIG. 1, in Patent Document 1, an inclined portion 231 formed at a lower end portion of a valve 230 is in contact with a step portion of a second branch portion 225 to form a contact portion 229 (line contact) And the refrigerant is prevented from flowing inside the main body 210 by the contact portion 229.

However, when the service valve is used for a long period of time, the contact portion 229 is depressed by frequent line contact between the step portion of the second branch portion 225 and the inclined portion 231 of the valve 230, .

In addition, there is a problem that the refrigerant is frozen by the temperature difference when the refrigerant comes into contact with the contact portion 229 which is in line contact as described above, and the fluid leaks through the frozen portion.

In order to solve this problem, in Patent Document 2, an open / close valve for opening / closing a refrigerant passage and an injection valve for injecting a refrigerant are constituted by one assembly, and as shown in FIG. 2, An inclined portion 151 is formed and an inclined surface 112 is formed inside the main body 110 so as to be in surface contact with the inclined portion 151 so that the inclined portion 151 and the inclined surface 112 are in contact with each other Thereby providing a stable surface contact area, thereby enhancing airtightness.

However, if the service valve is used for a long period of time, the inclined portion 151 and the inclined surface 112 are worn by frequent contact, and each contact surface forms a curved surface due to abrasion, thereby causing leakage of the fluid.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a service valve opening / And a sealing sealing type service valve configured to have a sealing effect superior to that of a valve.

It is another object of the present invention to provide a packing sealing type service valve which is formed of a Teflon material and is excellent in durability and airtightness, thereby preventing leakage of fluid.

According to an aspect of the present invention, there is provided an internal combustion engine having a first flow path and a second flow path branched from each other and communicating with each other, wherein first and second pipes are connected to the first flow path and the second flow path, And a third flow path is formed in the upper portion of the second flow path to communicate with the second flow path; And a valve stem that is formed to open and close the communicated first and second flow paths and to be opened and closed by contacting and releasing the step portion as a boundary portion between the second flow path and the third flow path, Wherein a packing provided on a lower surface of the valve stem contacts the step portion to close the first and second flow paths and release the first and second flow paths, A service valve may be provided.

Here, the step portion is characterized in that a depression is formed in the edge region.

In addition, the packing is formed of a Teflon (PTFE) material.

According to the present invention, since the sealing means is formed in the lower part of the valve stem for opening and closing the refrigerant passage, the refrigerating machine is more airtight than the existing metal sealing type service valve.

In addition, since the packing is made of Teflon and is resistant to durability, heat resistance, and corrosion resistance at low temperature, the life of the service valve is increased and maintenance cost can be reduced.

In addition, since the packing is inserted into the lower part of the valve stem, it can be easily separated and replaced when it is worn out due to long-term use, thereby reducing the maintenance cost of the service valve.

1 and 2 are views for explaining a conventional service valve.
3 is a perspective view illustrating a packing sealing type service valve of the present invention.
4 is a cross-sectional view of Fig.
5 is a cross-sectional view illustrating an operating state of the packing sealing type service valve of the present invention.
FIG. 6 is a cross-sectional view showing an applied state of another type of service valve according to the present invention.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Further, detailed descriptions of well-known functions and configurations that may be unnecessarily obscured by the gist of the present invention are omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a packing sealing type service valve according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a perspective view showing a packing sealing type service valve of the present invention, and FIG. 4 is a sectional view of FIG. 3.

3 and 4, the packing sealing type service valve of the present invention includes a first flow path 11 and a second flow path 12 for branching fluids and communicating with each other, The first and second pipes 31 and 32 are connected to the first and second flow paths 11 and 12 and the third flow path 13 is connected to the upper portion of the second flow path 12, (Not shown). Specifically, the second flow path 12 and the third flow path 13 are formed so as to communicate with each other in a straight line, and a first flow path 11 is formed at the middle portion between the second flow path 12 and the third flow path 13 It is a connected shape. That is, the shape of the cross section is formed in a 'T' shape.

On the other hand, it is possible to open and close the communicated first and second flow paths 11 and 12, and to open and close the communicating first and second flow paths 11 and 12 by contacting and releasing the step portion 12a, which is the boundary of the second flow path 12 and the third flow path 13 And is provided with a valve stem 20 that moves on the third flow path 13. A male screw is formed on the outer circumferential surface of the valve stem 20, and a female screw is formed on the inner circumferential surface of the third flow path 13 and screwed to each other. The outermost edge portion of the step portion 12a is formed as a curved surface so as to widen the contact area when contacting the packing 21 to be described later, thereby more strongly blocking inflow of the fluid.

On the other hand, a packing 21 is provided on the lower surface of the valve stem 20. That is, as shown in the drawing, a predetermined space is formed to be recessed from the lower surface of the valve stem 20 to the upper portion, and the packing 21 is inserted into the space corresponding to the space.

The packing 21 may be formed of Teflon. Teflon is a non-sticky material that does not adhere to almost all materials, has a low coefficient of friction with a load and slip rate in the range of about 0.05 to 0.20, a non-oil-free, oil-free, It has low temperature resistance, heat resistance which can not be decomposed at less than 260 ° C (400 ° F), little resistance to chemical environment, high heat resistance and chemical resistance which can withstand strong acid, alkali and solvent. Accordingly, by using the Teflon packing in the service valve of the present invention, the inflow of the fluid is originally blocked and the sealing effect can be enhanced.

Further, an O-ring 23 for a higher sealing is provided on the outer surface of the upper portion of the valve stem 20 and is in close contact with the inner wall of the third flow path 13. In addition, a limiting member 22 is provided at the upper end portion in the form of a ring, so that the operator can recognize the valve stem 20 by tactile feeling so that the valve stem 20 can no longer be pulled outward.

On the other hand, the step portion 12a may be formed with a depressed portion 12b on the entire edge region rim. 5, when the valve stem 20 is pressed by the special tool and brought into close contact with the step portion 12a, when the valve stem 20 is pressed excessively, the packing 21 May be excessively pressed to spread outwardly, which is formed to accommodate the spreading portion of the packing 21. Therefore, a higher sealing effect can be obtained.

Hereinafter, an operating state of the packing sealing type service valve of the present invention will be described.

Before describing the present invention, the packing sealing type service valve of the present invention is used for supplementing or supplying a refrigerant as a fluid to an air conditioner or a refrigerating machine. In the following description, a fluid is replaced with a refrigerant.

5 is a cross-sectional view illustrating an operating state of the packing sealing type service valve of the present invention.

Referring to FIG. 5, first, when a user replenishes or supplies a refrigerant to an air conditioner or a refrigerating machine, a first pipe 31 connected to a tank (not shown) in which the refrigerant is filled in the first flow path 11, And is connected to the inlet of the flow path 11. At this time, the coupling nut 33 is used to prevent the refrigerant from flowing out to the outside.

Then, the valve stem 20 is unscrewed through a special tool to move to the lower surface of the restriction member 22 which is the upper portion of the third flow path 13, and then the tank is opened to supplement or supply the refrigerant. 4, the valve stem 20 is rotated in the reverse direction when the valve stem 20 is opened. When the valve stem 20 is brought into contact with the step portion 12a, the rotation stops and the first and second flow paths (11, 12) are closed. Then, the binding nut 33 is disassembled to dismantle the first pipe 31, and then the protection cap 34 is coupled to the inlet of the first flow path 11 as shown in FIG. In addition, the protective cap 35 is also covered at the entrance of the third flow path 13 to complete the operation. The protective caps 34 and 35 are provided to prevent foreign matter or the like from entering the inside of the service valve.

In the meantime, although the one-way one-way service valve of the present invention has been described above, it can be applied to a one-way three-way service valve as shown in FIG. In addition, although not specifically shown in the drawings, the present invention can be applied to a two-way three-way service valve. The valve stem applied to the packing sealing type service valve of the present invention can be applied to service valves of various shapes.

The embodiments of the packing sealing type service valve of the present invention described above are merely exemplary and those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. You will know very well. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

10: main body 11: first flow path
12: second flow path 12a:
12b: depression portion 13: third flow path
20: valve stem 21: packing
22: limiting member 23: O-ring
31: first pipe 32: second pipe
33: binding nut 34: protective cap
35: Protective cap

Claims (3)

A first flow path 11 and a second flow path 12 for fluid movement are branched and communicated with each other and are connected to the first flow path 11 and the second flow path 12 through first and second pipes 11, (10) connected to the first flow path (31, 32), and a third flow path (13) formed on the second flow path (12) so as to communicate with the second flow path; And
The first flow path 11 and the second flow path 12 are opened and closed so that the first flow path 11 and the second flow path 12 are opened and closed by contacting and releasing the step portion 12a, And a valve stem (20) embedded on the third flow path (13) and moving on the third flow path (13)
The packing 21 provided on the lower surface of the valve stem 20 comes into contact with the step portion 12a to close the first and second flow paths 11 and 13, 11, 13) are opened. The method according to claim 1,
The step portion 12a includes:
And a depression (12b) is formed in an edge region thereof. The method according to claim 1,
The packing (21)
Wherein the valve body is formed of Teflon (PTFE) material.

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