JPH0722373U - Refrigerant injection valve - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress high-frequency noise caused by the "refrigerant injection valve". [Structure] A hollow valve body 4 is provided via a seal portion 3 in a valve seat pipe body 2 fixed to a refrigerant conduit pipe 1.
This is a refrigerant injection valve in which a valve rod 5 biased by a spring is inserted, and a packing 7 for closing and sealing an end opening 6 of the valve body is attached to an end of the valve rod 5 by a packing receiver 8. The leading edge 5a of the valve rod is the leading edge 2a of the valve seat tube body.
And is formed to be substantially flush with each other to prevent the entrainment of the refrigerant.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a refrigerant injection valve for injecting a refrigerant into a refrigerant pipe of a cooling cycle which constitutes an air conditioner for an automobile, and particularly, to suppress high-frequency abnormal noise caused by the refrigerant injection valve. Refrigerant injection valve.

[0002]

[Prior art]

 In order to inject the refrigerant into the cooling cycle that constitutes the automobile air conditioner, for example, one refrigerant injection valve is provided on each of the high pressure side and the low pressure side of the refrigerant pipe (the one provided on the high pressure side is the check valve and the other is the low pressure side). The one provided is called a charge valve).

As a conventional refrigerant injection valve, those disclosed in, for example, Japanese Utility Model Laid-Open No. 57-89,065 and Japanese Patent Laid-Open No. 58-13,969 are known. The medium injection valve is provided with a valve core in a valve body that is fixed in communication with the refrigerant conduit. This refrigerant injection valve opens the valve opening by pressing down the valve rod, which is movably provided with respect to the valve core, against a spring that urges the valve opening to be closed. Make an injection. Further, when the pushing force against the valve rod is removed after the injection of the refrigerant is completed, the valve rod is pushed up by the spring to close the refrigerant inlet.

[0004]

[Problems to be solved by the device]

 By the way, as shown in FIG. 3, when connecting the refrigerant conduit and the valve body of the cooling cycle, a hole is opened in the body of the refrigerant conduit 1, and the valve body 2 is inserted into this hole and the entire circumference is welded. Is done by. At this time, if the insertion depth of the valve body is set deeper, the valve body will be more stable during welding and joining, and the joining work will be easier.

However, when the valve body is shorter than the valve body 2 and a recess is present and the tip 2a of the valve body projects into the flow path of the refrigerant conduit 1, the refrigerant flowing in the refrigerant conduit is entrained in the valve body and swirled. Occurs. Therefore, there is a problem that a high-frequency noise is generated from the refrigerant injection valve when the cooling cycle is activated.

The present invention has been made in view of the conventional problems described above, and an object thereof is to suppress high-frequency abnormal noise caused by a refrigerant injection valve.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the refrigerant injection valve of the present invention is provided with a hollow valve body in a valve seat tube fixed to a refrigerant conduit via a seal portion, and the valve body is spring-biased. In a refrigerant injection valve in which a valve stem is inserted, and a packing for closing the end opening of the valve body is attached to the end of the valve stem by a packing receiver, the tip edge of the valve stem is It is characterized in that it is formed substantially flush with the tip edge of the seat tube.

[0008]

[Action]

 When joining the valve seat tube to the refrigerant conduit, it can be said that increasing the insertion depth of the tip of the valve seat tube is preferable from the viewpoint of joining work. However, if the valve seat tube is fixed so that the tip of the valve rod is short with respect to the valve seat tube and there is a recess, or the tip edge slightly projects from the refrigerant tube, the inside of the refrigerant conduit will be blocked. When the refrigerant circulates, the refrigerant is entrained in the valve seat tube, and high-frequency noise is generated. However, in the refrigerant injection valve of the present invention, since the leading edge of the valve rod is formed to be substantially flush with the leading edge of the valve seat tube body, the vortex flow of the refrigerant flowing in the refrigerant conduit causes the leading edge of the valve rod. Is blocked by the valve seat and the smooth flow is achieved without getting caught in the valve seat tube.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 (A) is a half sectional view showing a refrigerant injection valve according to an embodiment of the present invention, and FIG. 1 (B) is a principal part sectional view explaining the operation of the embodiment. In the refrigerant injection valve of the present embodiment, the valve body 4 is mounted inside the valve body (valve seat tube body) 2 that is fixedly connected to the refrigerant conduit 1, and this mounting is performed on the inner circumference of the valve body 2. It is performed by screwing a female screw formed on the surface and a male screw formed on the outer peripheral surface of the valve body 4. Further, the valve body 2 and the refrigerant conduit 1 are joined by forming a hole 9 in the body of the refrigerant conduit 1, inserting the front end of the valve body 2 into this hole 9, and then welding the entire circumference of the joint. It is done by

The valve body 4 is composed of a head portion 4a having an outer peripheral surface formed with a male screw which is screwed with a female screw of the valve body 2, and a hollow body portion 4b having a seal portion 3 formed on the outer peripheral surface. , The two are joined by caulking.

A valve rod 5 is inserted into the valve body 4, and a bulging packing receiver 8 is formed at a lower end of the valve rod 5, and the packing receiver 8 has an end portion of a body portion 4 b. A packing 7 for closing the opening 6 is attached. A coil spring 10 is interposed between an upper portion of the valve rod 5 and the valve body 4, and the valve rod 5 is biased by the valve body 4 upward in the drawing. Therefore, when no external force acts on the valve rod 5, the packing 7 is pressed against the lower end of the body portion 4b of the valve body 4 by the elastic force of the coil spring, and the end opening 6 is closed and sealed.

Reference numeral “3” shown in FIG. 1 is a seal portion formed on the body portion 4 b, and seals the upper side and the lower side of the valve body 4 to close it. That is, the refrigerant flowing in the refrigerant conduit 1 is prevented from passing between the valve body 2 and the valve body 4 and leaking to the outside. The seal portion 3 may be a metal seal or a separate seal packing may be provided.

In the refrigerant injection valve of the present embodiment, the leading edge 2a of the valve body 2 and the leading edge 5a of the valve rod 5 are set to be substantially flush with each other. Specifically, for the dimension A shown in FIG. 1A, A = 0 to 1 mm. Ideally, it is preferable to set A = 0, but A = 0 to 1 mm may be set because of an error in assembling the valve body 4 to the valve body 2. Further, in order to achieve such a dimensional relationship, the tip edge 5a of the valve rod 5 may be lengthened or the tip edge 2a of the valve body 2 may be shortened.

Next, the operation of the embodiment will be described. In order to inject the refrigerant into the refrigerant conduit 1 of the cooling cycle from the refrigerant injection valve, first, the cap 11 is removed, and then the head portion 5b of the valve rod 5 is pushed down. As a result, the valve rod 5 descends against the elastic force of the coil spring 10, and a gap is formed between the packing 7 and the end opening 6 of the body portion 4b. When the refrigerant is injected from the upper end of the valve body 2 during this time, the refrigerant passes between the valve rod 5 and the hollow valve body 4 and is injected into the refrigerant conduit 1 from the end opening 6.

After the coolant is injected, the valve rod 5 is lifted by the elastic force of the coil spring 10 to return to the original position shown in FIG. 1 (A), and the end opening 6 is closed by the packing 7. At this time, since the seal portion 3 seals between the inner peripheral surface of the valve body 2 and the body portion 4b on the outside of the body portion 4b, leakage of the refrigerant from the refrigerant conduit can be prevented. .

In particular, in the refrigerant injection valve of the present embodiment, the tip end edge 5a of the valve rod 5 is formed substantially flush with the tip end edge 2a of the valve body 2, so that as shown in FIG. Even if the refrigerant flows through the refrigerant conduit 1, the refrigerant smoothly flows without being caught in the valve body 2. Therefore, the generation of the vortex flow of the refrigerant flowing in the refrigerant conduit is prevented, and the generation of high-frequency noise can be prevented.

FIG. 2 is a graph showing a result of observing noise in comparison with a conventional refrigerant injection valve in order to explain the effect of the present embodiment. It is understood that the high frequency noise near the kHz is reduced in this embodiment.

It should be noted that the embodiments described above are described for facilitating the understanding of the present invention, and not for limiting the present invention. Therefore, each element disclosed in the above-described embodiments is intended to include all design changes and equivalents within the technical scope of the present invention.

For example, the structure of the refrigerant injection valve of the present invention is not limited to the specific example shown in FIG. 1 (A), and can be appropriately modified as necessary.

[0020]

[Effect of device]

 As described above, in the refrigerant injection valve of the present invention, since the leading edge of the valve rod is formed to be substantially flush with the leading edge of the valve body, high frequency abnormal noise caused by the vortex flow of the refrigerant flowing in the refrigerant conduit is generated. Can be prevented.

[Brief description of drawings]

FIG. 1A is a half cross-sectional view showing a refrigerant injection valve according to an embodiment of the present invention, and FIG. 1B is a main-part cross-sectional view illustrating the operation of the embodiment.

FIG. 2 is a graph illustrating the effect of the same example.

FIG. 3 is a partial cross-sectional view showing a conventional refrigerant injection valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Refrigerant conduit, 2 ... Valve seat tube body, 2a ... Tip edge, 3 ... Seal part, 4 ... Valve body, 5 ... Valve rod, 5a ... Tip edge, 6 ... End opening, 7 ... Packing, 8 ... Packing receiver.

Claims (1)

[Scope of utility model registration request] 1. A valve seat tube fixed to a refrigerant conduit (1)
A hollow valve body (4) is provided inside the (2) via the seal part (3), and a spring-biased valve stem (5) is inserted into the valve body (4) and the valve stem (4) is inserted. 5) Open the end of the valve body at the end of
Packing (7) that closes and seals (6) Packing receiver (8)
The refrigerant injection valve according to claim 1, wherein the tip end edge (5a) of the valve rod is formed substantially flush with the tip end edge (2a) of the valve seat tube body.