CN202493696U - Improved structure of nut seat of electronic expansion valve - Google Patents

Abstract

The utility model discloses an improved structure of a nut seat of an electronic expansion valve, which comprises a nut seat cylinder body and a valve needle guide sleeve arranged separately, and the nut seat cylinder body is arranged in a valve inner hole and interferes with the valve inner hole Cooperate, the valve needle guide sleeve is arranged under the nut seat cylinder and has an interference fit with the valve inner hole. There is a gap between the nut seat cylinder and the valve needle guide sleeve and forms a buffer cavity with the valve inner hole. The buffer cavity and the valve body The pressure balance holes in the body are connected correspondingly. The utility model adopts the split structure of the nut seat cylinder and the valve needle guide sleeve to replace the existing integrated structure of the nut seat cylinder and the valve needle guide sleeve, so that the refrigerant first produces an impact force on the valve needle guide sleeve, and then The nut seat cylinder produces an impact force, and at this time the impact force on the nut seat cylinder has been greatly reduced, almost negligible; at the same time, a buffer chamber is set to further release the refrigerant pressure after passing through the guide sleeve. Ensure that the nut seat cylinder does not come out of the inner hole of the valve body.

Description

An improved structure of an electronic expansion valve nut seat

technical field

The utility model relates to a valve, in particular to an improved structure of a nut seat of an electronic expansion valve.

Background technique

With the popularization of frequency conversion air conditioners, electronic expansion valves are the main components of frequency conversion air conditioners, and their performance has a great impact on the comfort and energy saving of air conditioners. The working pressure of R410 refrigerant, which is gradually promoted at present, is much higher than that of ordinary refrigerants, and the pressure resistance requirements for electronic expansion valves are also quite high. In the prior art, as shown in FIG. 7 , the nut seat of the electronic expansion valve includes a nut seat cylinder 01 and a valve needle guide sleeve 02 integrated into one body, and the nut seat cylinder 01 and the valve inner hole 031 in the valve body 03 pass through When the intake pipe is ventilated instantly, almost all the air pressure will act on the nut seat cylinder 01 and the valve needle guide sleeve 02. Since the nut seat cylinder 01 is generally made of self-lubricating materials, there is almost no Elastic deformation, so the interference fit between the nut seat cylinder 01 and the valve body hole 031 cannot be effectively controlled. In some specific environments, the impact force generated by the refrigerant is greater than the fit force between the nut seat cylinder 01 and the valve body hole 031 , it may cause the nut seat cylinder 01 to break away from the hole 031 in the valve body, resulting in failure of the control function of the electronic expansion valve.

Contents of the invention

The problem to be solved by the utility model is to provide an improved structure of the nut seat of the electronic expansion valve which saves cost and has a simple structure, which can ensure that the nut seat of the electronic expansion valve will not break away from the inner hole of the valve under extreme conditions.

In order to solve the above technical problems, the utility model adopts the following technical scheme: an improved structure of the nut seat of an electronic expansion valve, which is characterized in that it includes a nut seat cylinder and a valve needle guide sleeve arranged separately, and the nut seat cylinder It is arranged in the inner hole of the valve body and has an interference fit with the inner hole of the valve body. The needle guide sleeve is arranged under the nut seat cylinder and is interference fit with the valve inner hole. There is a gap between the nut seat cylinder body and the valve needle guide sleeve A buffer cavity is formed with the inner hole of the valve body, and the buffer cavity communicates with the pressure balance hole in the valve body correspondingly.

Further, an axial flow groove communicating with the main channel of the valve body and the buffer chamber is provided between the outer ring surface of the valve needle guide sleeve and the hole wall of the inner hole of the valve body. The axial flow groove is used for fluid flow, so that the matching clearance between the valve needle guide sleeve and the valve needle is reduced, which is more precise than that of the prior art. The valve needle guide sleeve guides the valve needle to prevent damage to the valve port.

Further, the axial flow groove is provided on the outer ring surface of the valve needle guide sleeve.

Further, the axial flow groove is arranged on the hole wall of the inner hole of the valve.

Further, an axial flow groove connecting the main flow passage of the valve body and the buffer chamber is provided between the inner ring surface of the valve needle guide sleeve and the outer ring surface of the valve needle. Ensure the matching strength between the valve needle guide sleeve and the inner hole of the valve body, and maintain a good fixing effect under the impact force generated by the refrigerant.

Further, the axial flow groove is provided on the inner ring surface of the valve needle guide sleeve.

Further, the axial flow groove is provided on the outer ring surface of the valve needle.

Further, the valve needle guide sleeve is a stainless steel guide sleeve. Stainless steel has a certain degree of elasticity, the hardness is equivalent to the valve needle, wear-resistant, does not generate debris, does not block the valve port, and ensures the strength of cooperation with the inner hole of the valve.

Further, the valve needle guide sleeve is a straight cylinder. The structure is simple and the production is convenient.

Further, the valve needle guide sleeve is a cylinder with a stepped outer ring surface. It is beneficial to adjust the position when installing the valve needle guide sleeve.

After adopting the above technical scheme, the utility model has the following advantages: the split structure of the nut seat cylinder and the valve needle guide sleeve replaces the existing integrated structure of the nut seat cylinder and the valve needle guide sleeve, so that the refrigerant directly flows into the nut The impact force generated by the seat cylinder becomes that the refrigerant first produces an impact force on the valve needle guide sleeve, and then produces an impact force on the nut seat cylinder. At this time, the impact force on the nut seat cylinder has been greatly reduced and can almost be ignored. ; At the same time, a buffer chamber is set to communicate with the pressure balance hole in the valve body, which can further release the refrigerant pressure after passing through the guide sleeve, so as to ensure that the nut seat cylinder does not come out of the valve inner hole.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

Fig. 2 is a structural schematic diagram of the axial flow groove provided on the outer ring surface of the needle guide sleeve;

Fig. 3 is a structural schematic diagram of an axial flow groove arranged on the hole wall of the inner hole of the valve;

Fig. 4 is a structural schematic diagram of the axial flow groove provided on the inner ring surface of the needle guide sleeve;

Fig. 5 is a structural schematic diagram of the axial flow groove provided on the outer ring surface of the valve needle;

Fig. 6 is a schematic structural view of a cylinder with a stepped outer ring;

Fig. 7 is a schematic structural diagram of a conventional electronic expansion valve nut seat.

Detailed ways

As shown in Figure 1, it is an embodiment of the utility model, an improved structure of the nut seat of an electronic expansion valve, including a nut seat cylinder 1 and a valve needle guide sleeve 2 arranged separately, and the nut seat cylinder is arranged on The inner hole 31 of the valve body 3 is in an interference fit with the inner hole of the valve body. The needle guide sleeve is arranged under the nut seat cylinder body and is interference fit with the inner hole of the valve body. The gap between the nut seat cylinder body and the needle guide sleeve There is a gap between them and forms a buffer cavity 4 with the inner hole of the valve body, and the buffer cavity communicates with the pressure balance hole 5 in the valve body correspondingly.

In this embodiment, an axial flow groove 7 communicating with the main channel 6 of the valve body and the buffer cavity is provided between the outer ring surface 21 of the needle guide sleeve and the hole wall 32 of the inner hole of the valve body. As shown in FIG. 2, the axial flow groove can be arranged on the outer ring surface of the needle guide sleeve; or, as shown in FIG. 3, the axial flow groove can be arranged on the hole wall of the inner hole of the valve. In addition, an axial flow groove can also be provided between the inner ring surface 22 of the valve needle guide sleeve and the outer ring surface 81 of the valve needle 8 . As shown in FIG. 4 , the axial flow groove is arranged on the inner ring surface of the valve needle guide sleeve; or as shown in FIG. 5 , the axial flow groove is arranged on the outer ring surface of the valve needle.

In addition, the valve needle guide sleeve is preferably a stainless steel guide sleeve. In this embodiment, the needle guide sleeve is a straight cylinder. It can also be set as a cylinder with a stepped outer ring surface 23 as shown in FIG. 6 .

The utility model adopts the split structure of the nut seat cylinder and the valve needle guide sleeve to replace the existing integrated structure of the nut seat cylinder and the valve needle guide sleeve, so that the impact force generated by the refrigerant directly on the nut seat cylinder becomes The refrigerant first produces an impact force on the valve needle guide sleeve, and then produces an impact force on the nut seat cylinder. At this time, the impact force on the nut seat cylinder has been greatly reduced and can almost be ignored; at the same time, a buffer chamber is set. Correspondingly communicated with the pressure balance hole in the valve body, the pressure of the refrigerant passing through the guide sleeve can be further released, so as to ensure that the nut seat cylinder does not come out of the inner hole of the valve body.

In addition to the above-mentioned preferred embodiment, the utility model also has other implementation modes, those skilled in the art can make various changes and deformations according to the utility model, as long as they do not depart from the spirit of the utility model, all should belong to the appended rights of the utility model The scope defined by the requirement.

Claims (10)

1. An improved structure of the nut seat of an electronic expansion valve, characterized in that: it includes a nut seat cylinder (1) and a valve needle guide sleeve (2) arranged separately, and the nut seat cylinder is arranged on the valve body (3 ) in the body hole (31) of the valve body and interference fit with the body hole of the valve body. There is a gap between them and forms a buffer cavity (4) with the inner hole of the valve body, and the buffer cavity communicates with the pressure balance hole (5) in the valve body correspondingly. 2. The improved structure of the nut seat of an electronic expansion valve according to claim 1, characterized in that: an outer ring surface (21) of the valve needle guide sleeve and a hole wall (32) of the inner hole of the valve body are provided. There is an axial flow groove (7) communicating with the main channel (6) of the valve body and the buffer cavity. 3 . The improved structure of the nut seat of the electronic expansion valve according to claim 2 , wherein the axial flow groove is provided on the outer ring surface of the valve needle guide sleeve. 4 . 4 . The improved structure of the nut seat of an electronic expansion valve according to claim 2 , wherein the axial flow groove is arranged on the wall of the inner hole of the valve. 5 . 5. The improved structure of an electronic expansion valve nut seat according to claim 1, characterized in that: the inner ring surface (22) of the valve needle guide sleeve and the outer ring surface (81) of the valve needle (8) An axial flow groove communicating with the main channel of the valve body and the buffer chamber is arranged between them. 6 . The improved structure of the nut seat of an electronic expansion valve according to claim 5 , wherein the axial flow groove is arranged on the inner ring surface of the valve needle guide sleeve. 7 . 7. The improved structure of the nut seat of an electronic expansion valve according to claim 5, wherein the axial flow groove is provided on the outer ring surface of the valve needle. 8. The improved structure of the nut seat of an electronic expansion valve according to any one of claims 1 to 7, wherein the valve needle guide sleeve is a stainless steel guide sleeve. 9. The improved structure of the nut seat of the electronic expansion valve according to claim 8, wherein the valve needle guide sleeve is a straight cylinder. 10. The improved structure of an electronic expansion valve nut seat according to claim 8, characterized in that: the valve needle guide sleeve is a cylinder with a stepped outer ring surface (23).

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