CN109237846A - An electronic expansion valve - Google Patents

Abstract

The present invention provides an electronic expansion valve, comprising: a valve body assembly, a valve seat with a valve port is disposed at the bottom of the valve body assembly, and a valve head corresponding to the valve port of the valve seat is disposed in the valve body assembly ; The valve head is a through-hole structure and a third cavity is arranged at the bottom of the valve head; the valve core shaft is slidably connected with the inner ring of the valve head, and a shaft connecting cap is provided on the top of the valve core shaft; the shaft connecting cap The outer ring is sealed and slidably connected to the spring sleeve; the valve core shaft is connected to an elastic element at the lower part of the shaft connection cap; the elastic element is arranged in the valve head; the top of the valve head is provided with a first cavity; the The outer ring of the valve head is sealed and slidably connected to the spring sleeve; the top of the spring sleeve is connected to the nut assembly; wherein, a balance channel connecting the first cavity and the third cavity is formed by the balance groove. The structure effectively converts the drilling and boring processing of the inner hole of the valve core shaft into turning and milling processing, reduces the difficulty and cost of trial production of the valve core shaft, is convenient for processing, and has a long service life.

Description

An electronic expansion valve

technical field

The present invention relates to an electronic expansion valve.

Background technique

As a new type of control element, the electronic expansion valve has already broken through the concept of throttling mechanism. It is an important part of the intelligentization of the refrigeration system, and it is also an important means and guarantee for the optimization of the refrigeration system. It is also the mechanical and electrical integration of the refrigeration system. Symbols have been used in more and more fields.

There are two types of electronic expansion valves (direct-acting type and gear type) with the existing valve head self-balancing structure, the valve head balance channel includes the first balance hole 11' and the second balance hole 12' on the valve core shaft 1', The outer wall of the end of the valve core shaft 1' close to the valve port 2' is matched with the inner hole of the valve head 3', a first balance hole 11' is machined in the shaft center of the valve core shaft 1', and a second balance hole 12' is machined on the side wall. . Due to the working characteristics of the valve head 3' self-balancing structure, the outer diameter of the valve head 3' installed on the spring sleeve/seal seat must be the same as the valve diameter, and the valve head assembly needs to be provided with a space for installing seals or elastic elements, resulting in The outer diameter of the end of the valve core shaft 1' used to match the valve head 3' is limited. Therefore, when the valve diameter becomes smaller, especially when the valve diameter is 4.0mm or less, the first balance hole 11' and the second balance hole 12' are difficult to machine and cannot be machined, and the two machined balance holes are often caused by It is too small and leads to the extension of voltage regulation time and other defects, which cannot meet the expansion and development needs of small and medium-sized self-balancing product series.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an electronic expansion valve to solve the problem of difficulty in machining the first balance hole and the second balance hole on the valve core shaft of the current electronic expansion valve, especially the small-diameter valve.

In order to solve the above-mentioned technical problems, an electronic expansion valve is provided as the present invention, comprising:

A valve body assembly, a valve seat with a valve port is arranged at the bottom of the valve body assembly, and a valve head corresponding to the valve port of the valve seat is arranged in the valve body assembly; the valve head is a through-hole structure and is located in the valve body A third cavity is arranged at the bottom of the head;

The valve core shaft is slidably connected with the inner ring of the valve head, and the top of the valve core shaft is provided with a shaft connection cap; the outer ring of the shaft connection cap is sealed and slidably connected to the spring sleeve; the valve core shaft is located on the lower part of the shaft connection cap an elastic element is connected; the elastic element is arranged in the valve head; the top of the valve head is provided with a first cavity;

The outer ring of the valve head is sealed and slidably connected to the spring sleeve; the top of the spring sleeve is connected to the nut assembly; wherein,

A balance groove is provided on the valve core shaft and at the lower part of the shaft connection cap, and the balance groove constitutes a balance channel connecting the first cavity and the third cavity.

Further, the balance groove is a single-slot structure or a multi-slot structure formed by turning and milling.

Further, the bottom of the shaft connection cap is connected to the elastic element through a spring pad, and the first cavity is provided between the bottom of the shaft connection cap and the top of the valve head;

The top of the shaft connecting cap is connected with a screw; the screw is mounted on the nut assembly, and the outer ring of the spring sleeve, the outer ring of the valve head and the valve body assembly form a second cavity.

Further, the first cavity is disposed between the shaft connecting cap and the nut assembly;

A balance hole is provided on the shaft connection cap, and the balance hole and the balance slot form a balance channel connecting the first cavity and the third cavity;

A second cavity is formed in the spring sleeve outer ring, the valve head outer ring and the valve body assembly.

Further, a first sealing member is arranged between the inner ring of the spring sleeve and the outer ring of the valve head.

Further, the balance slot is a turning and milling single-slot structure opened at the lower part of the valve core shaft; the bottom of the valve core shaft is provided with a tablet mounting shaft;

A through hole seat is arranged in the valve head, after the valve core shaft is inserted into the through hole seat, the bottom of the elastic element is clamped on the top of the through hole seat; the valve core shaft under the through hole seat The bottom pressing piece is fixedly installed on the mounting shaft of the pressing piece.

Further, the balance holes are arranged along the axial direction of the shaft connection cap; the balance holes include a plurality of them.

Further, the balance groove is a turning-milling single-slot structure or a spline-type structure opened on the valve core shaft.

Further, a second sealing member is arranged between the inner ring of the spring sleeve and the outer ring of the valve head.

Compared with the prior art, the intentional effect of the present invention is:

An electronic expansion valve provided by the present invention includes: a valve body assembly, a valve seat with a valve port is disposed at the bottom of the valve body assembly, and a valve head corresponding to the valve port of the valve seat is disposed in the valve body assembly ; The valve head is a through-hole structure and a third cavity is arranged at the bottom of the valve head; the valve core shaft is slidably connected with the inner ring of the valve head, and a shaft connecting cap is provided on the top of the valve core shaft; the shaft connecting cap The outer ring is sealed and slidably connected to the spring sleeve; the valve core shaft is connected to an elastic element at the lower part of the shaft connection cap; the elastic element is arranged in the valve head; the top of the valve head is provided with a first cavity; the The outer ring of the valve head is sealed and slidably connected to the spring sleeve; the top of the spring sleeve is connected to the nut assembly; wherein, a balance channel connecting the first cavity and the third cavity is formed by the balance groove. The structure effectively converts the drilling and boring processing of the inner hole of the valve core shaft into turning and milling processing, reduces the difficulty and cost of trial production of the valve core shaft, is convenient for processing, and has a long service life.

Description of drawings

FIG. 1 schematically shows a schematic structural diagram of an existing large-diameter electronic expansion valve;

FIG. 2 schematically shows a schematic diagram of a partial exploded structure of the electronic expansion valve in the first embodiment of the present invention;

FIG. 3 schematically shows a schematic structural diagram of each cavity after the electronic expansion valve is partially assembled in Embodiment 1 of the present invention;

FIG. 4 schematically shows a schematic structural diagram of the electronic expansion valve after assembly in the first embodiment of the present invention;

FIG. 5 schematically shows a cross-sectional view of the electronic expansion valve after being assembled in the first embodiment of the present invention;

Fig. 6 schematically shows the structural schematic diagram of the valve core shaft in the first embodiment of the present invention;

FIG. 7 schematically shows a schematic diagram of a partially exploded structure of the electronic expansion valve in the second embodiment of the present invention;

FIG. 8 schematically shows a schematic structural diagram of each cavity after the electronic expansion valve is partially assembled in the second embodiment of the present invention;

FIG. 9 schematically shows a schematic structural diagram of the electronic expansion valve after assembly in the second embodiment of the present invention;

Fig. 10 schematically shows a cross-sectional view of the electronic expansion valve after being assembled in the second embodiment of the present invention;

FIG. 11 schematically shows the structural schematic diagram of the valve core shaft in the second embodiment of the present invention;

FIG. 12 schematically shows a schematic structural diagram of the valve core shaft from another perspective in the second embodiment of the present invention.

Reference numerals in the figure: 1, valve body assembly; 11, valve port; 2, valve head; 21, third cavity; 22, first cavity; 23, through hole seat; 24, second cavity; 3 , valve core shaft; 31, shaft connection cap; 32, balance groove; 33, balance hole; 34, pressure plate installation shaft; 35, pressure plate; 4, spring sleeve; 41, first seal; 41, second seal 5. Screw; 6. Nut assembly; 7. Elastic element; 71. Spring washer.

Detailed ways

Embodiments of the invention are described in detail below, but the invention can be practiced in many different ways as defined and covered by the claims.

Example 1

Referring to FIGS. 2 to 6 , an embodiment of the present invention provides an electronic expansion valve. The electronic expansion valve includes: a valve body assembly 1 and a valve core shaft 3 , and a valve with a valve port 11 is provided at the bottom of the valve body assembly 1 The seat 12, the valve body assembly 1 is provided with a valve head 2 corresponding to the valve port of the valve seat 12; the valve head is a through-hole structure and a third cavity 21 is arranged at the bottom of the valve head; If the rings are slidably connected, the top of the valve core shaft 3 is provided with a shaft connecting cap 31; the outer ring of the shaft connecting cap 31 is sealed and slidably connected to the spring sleeve 4; the valve core shaft 3 is connected to the elastic element 7 at the lower part of the shaft connecting cap 31; the elastic element 7 is connected It is arranged in the valve head 2; the top of the valve head 2 is provided with a first cavity 22; the outer ring of the valve head 2 is sealed and slidably connected to the spring sleeve 4; the top of the spring sleeve 4 is connected to the nut assembly 6; The lower part of the cap 31 is provided with a balance groove 32 , and the balance groove 32 constitutes a balance channel connecting the first cavity 22 and the third cavity 21 .

It effectively converts the drilling and boring processing of the inner hole of the spool shaft 3 into turning and milling processing, which reduces the difficulty and cost of the trial production of the spool shaft 3, and ensures the balanced channel ventilation and reduces the voltage stabilization time, thereby effectively ensuring the pressure at both ends of the valve head for small and medium-sized products. Balance, further reduce the load force of the rotor, improve the valve opening capacity of the sample, and reduce the space size of the rotor and coil of the same specification product, achieving low energy consumption.

By arranging balance grooves with different structures on the valve core shaft 3, and replacing the structure of the balance hole by the balance groove 3, it is especially suitable for small-diameter electronic expansion valves, which is easy to process and has a long service life.

The balance groove 32 is a single-slot structure or a multi-slot structure formed by turning and milling. By changing the previous spool shaft 3 inner hole drilling and boring processing to the turning and milling groove structure, the manufacturing difficulty of the balance channel on the spool shaft 3 is reduced, and the manufacturing cost is also reduced.

The bottom of the shaft connecting cap 31 is connected with the elastic element 7 through the spring washer 71, the first cavity 22 is arranged between the bottom of the shaft connecting cap 31 and the top of the valve head 2; the top of the shaft connecting cap 31 is connected to the screw 5; the screw 5 is installed on the nut On the assembly 6 , the outer ring of the spring sleeve 4 , the outer ring of the valve head 2 and the valve body assembly 1 form a second cavity 24 .

Since the outer ring of the shaft connecting cap is sealed and slidably connected to the spring sleeve, in order to balance the pressure difference between the two ends of the valve head, the first cavity is arranged between the valve head and the shaft connecting cap, and the third cavity is connected to the first cavity. The bodies can be communicated through the balance channel to keep the pressure balance at both ends of the valve head. A first sealing member 41 is provided between the inner ring of the spring sleeve 4 and the outer ring of the valve head 3 .

The balance slot 32 is a single-turning-milling slot structure opened at the lower part of the spool shaft 3; the bottom of the spool shaft 3 is provided with a pressing plate mounting shaft 34; , the bottom of the elastic element 71 is clamped on the top of the through hole seat 23 ;

The structural principle of the first embodiment of the present invention is as follows: as shown in FIG. 2-FIG. 6, the valve head self-balancing structure of the electronic expansion valve is provided with a balance channel, and the balance channel includes a balance groove 32 arranged on the valve core shaft 3, The balance groove 32 is arranged on the installation shaft on the lower side of the valve core shaft 3. When the inner hole of the valve head 2 is matched with the installation shaft of the valve core shaft 3, the refrigerant can enter the valve body through the gap between the balance groove 32 and the inner hole of the valve head 2. inside the first cavity 22. Therefore, when the valve is fully closed, the refrigerant of the first cavity 22 and the third cavity 21 can pass through the balance channel; the spring sleeve 4 and the valve body assembly are sealedly connected, and a first seal is arranged between the valve head 2 and the spring sleeve 4 41. The guide section of the valve head 2 is guided and matched with the guide hole of the spring sleeve 4, so a guiding and sealing effect is formed between the two, so the refrigerant in the second cavity 24 does not communicate with the first cavity 22; the inner diameter of the guide hole of the spring sleeve 4 is related to the valve The diameter of port 11 is the same; in summary, it can ensure that the refrigerant pressure at both ends of the valve head 2 is the same, and the effective area is the same, which fundamentally solves the problem of pressure difference and improves the valve opening ability of the product.

In addition, in this embodiment, the valve core shaft 3 can be machined, and then grooved to form a balance groove; the valve core shaft 3 can be powder metallurgically formed into splines and other special-shaped outer walls to form the balance groove 32;

The advantages of this embodiment include: the outer wall of the spool shaft is deformed, which can effectively solve the problem that the inner hole and the side hole of the existing spool shaft are difficult to process, especially in the case of small-diameter valves, there are problems such as long voltage stabilization time; Turning and milling or powder metallurgy processing into balanced grooves, low cost, simple processing and high qualification rate; easy to expand the series of small and medium specifications;

As shown in Figures 2-6, the working principle of the electronic expansion valve of the present invention: the electronic expansion valve is composed of a valve body assembly and a coil, and the valve body assembly includes a valve needle part, a rotor part, a screw part and a valve body part; wherein, the valve body The components include the valve head 2, the refrigerant balance channel and the internal leakage sealing structure matched with it. When working, the rotor rotates under the drive of the external coil, and transmits the torque to the screw 5. The side effect of the screw 5 and the nut assembly 6 converts the rotary motion into a linear motion, thereby pushing the valve head 2 and its components to run axially to achieve On-off valve; due to the function of the valve head balancing channel, the pressure balance of the valve head 2 in each cavity of the valve body can be ensured, and the valve opening ability of the sample piece can be improved.

Embodiment 2

Referring to FIGS. 7 to 12 , an embodiment of the present invention provides an electronic expansion valve. The electronic expansion valve includes: a valve body assembly 1 and a valve core shaft 3 , and a valve with a valve port 11 is provided at the bottom of the valve body assembly 1 The seat 12, the valve body assembly 1 is provided with a valve head 2 corresponding to the valve port of the valve seat 12; the valve head is a through-hole structure and a third cavity 21 is arranged at the bottom of the valve head; If the rings are slidably connected, the top of the valve core shaft 3 is provided with a shaft connection cap 31; the outer ring of the shaft connection cap 31 is sealed and slidably connected to the spring sleeve 4; the valve core shaft 3 is connected to the elastic element 7 at the lower part of the shaft connection cap 31; the elastic element 7 is provided Inside the valve head 2; the top of the valve head 2 is provided with a first cavity 22; the outer ring of the valve head 2 is sealed and slidingly connected to the spring sleeve 4; the top of the spring sleeve 4 is connected to the nut assembly 6; wherein, the valve core shaft 3 is located on the shaft connection cap The lower part of 31 is provided with a balance slot 32 , and the balance slot 32 constitutes a balance channel connecting the first cavity 22 and the third cavity 21 .

It effectively converts the drilling and boring processing of the inner hole of the spool shaft 3 into turning and milling processing, which reduces the difficulty and cost of the trial production of the spool shaft 3, and ensures the balanced channel ventilation and reduces the voltage stabilization time, thereby effectively ensuring the pressure at both ends of the valve head for small and medium-sized products. Balance, further reduce the load force of the rotor, improve the valve opening capacity of the sample, and reduce the space size of the rotor and coil of the same specification product, achieving low energy consumption.

By arranging balance grooves with different structures on the valve core shaft 3, and replacing the structure of the balance hole by the balance groove 3, it is especially suitable for small-diameter electronic expansion valves, which is easy to process and has a long service life.

The balance groove 32 is a single-slot structure or a multi-slot structure formed by turning and milling. By changing the previous spool shaft 3 inner hole drilling and boring processing to the turning and milling groove structure, the manufacturing difficulty of the balance channel on the spool shaft 3 is reduced, and the manufacturing cost is also reduced.

The first cavity 22 is arranged between the shaft connecting cap 31 and the nut assembly 6 ; the shaft connecting cap 31 is provided with a balance hole 33 , and the balance hole 33 and the balance groove 32 constitute a balance connecting the first cavity 22 and the third cavity 21 The outer ring of the spring sleeve 4, the outer ring of the valve head 2 and the valve body assembly 1 constitute a second cavity 24.

The balance hole 33 is arranged along the axial direction of the shaft connecting cap 31; the balance hole 33 includes a plurality of them. The balance groove 32 is a single-turned-milled groove structure or a spline-type structure opened on the spool shaft 3 . A second sealing member 42 is arranged between the inner ring of the spring sleeve 4 and the outer ring of the valve head 3 .

The structural principle of the second embodiment of the present invention is as follows: as shown in FIG. 7-FIG. 12 , the valve head self-balancing structure of the electronic expansion valve is provided with a balance channel, and the balance channel includes a balance groove 32 arranged on the valve core shaft 3 and The balance hole 33 and the balance groove 32 are arranged on the installation shaft on the lower side of the spool shaft 3, and the balance hole 33 is arranged on the shaft connecting cap 31 on the top of the spool shaft 3. When the inner hole of the valve head 2 is installed with the spool shaft 3 After the shafts are matched, the refrigerant can enter the first cavity 22 of the valve body through the gap between the balance hole 33 , the balance groove 32 and the inner hole of the valve head 2 . Therefore, when the valve is fully closed, the refrigerant of the first cavity 22 and the third cavity 21 can pass through the balance channel; the spring sleeve 4 and the valve body assembly are sealedly connected, and a second sealing member is arranged between the valve head 2 and the spring sleeve 4 42. The guide section of the valve head 2 is guided and matched with the guide hole of the spring sleeve 4, so a guiding and sealing effect is formed between the two, so the refrigerant in the second cavity 24 does not pass through the first cavity 22; the inner diameter of the guide hole of the spring sleeve 4 is related to the valve The diameter of port 11 is the same; in summary, it can ensure that the refrigerant pressure at both ends of the valve head 2 is the same, and the effective area is the same, which fundamentally solves the problem of pressure difference and improves the valve opening ability of the product.

For the principle, reference may be made to the description of Embodiment 1, and details are not repeated here.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. An electronic expansion valve, comprising:

the valve comprises a valve body assembly (1), wherein a valve seat (12) with a valve port (11) is arranged at the bottom of the valve body assembly, and a valve head (2) corresponding to the valve port of the valve seat (12) is arranged in the valve body assembly (1); the valve head is of a through hole structure, and a third cavity (21) is arranged at the bottom of the valve head;

the valve core shaft (3) is connected with the inner ring of the valve head (2) in a sliding mode, and a shaft connecting cap (31) is arranged at the top of the valve core shaft (3); the outer ring of the shaft connecting cap (31) is connected with the spring sleeve (4) in a sealing and sliding manner; the valve core shaft (3) is positioned at the lower part of the shaft connecting cap (31) and is connected with an elastic element (7); the elastic connecting element (7) is arranged in the valve head (2); a first cavity (22) is arranged at the top of the valve head (2);

the outer ring of the valve head (2) is connected with a spring sleeve (4) in a sealing and sliding manner; the top of the spring sleeve (4) is connected with a nut component (6); wherein,

and a balance groove (32) is formed in the valve core shaft (3) and positioned at the lower part of the shaft connecting cap (31), and the balance groove (32) forms a balance channel for communicating the first cavity (22) and the third cavity (21).

2. An electronic expansion valve according to claim 1, wherein the balancing groove (32) is a single-groove structure or a multi-groove structure which is turn-milled.

3. An electronic expansion valve according to claim 2, wherein the bottom of the shaft connection cap (31) is connected with the resilient element (7) by a spring washer (71), the first cavity (22) being arranged between the bottom of the shaft connection cap (31) and the top of the valve head (2);

the top of the shaft connecting cap (31) is connected with a screw rod (5); the screw rod (5) is installed on the nut component (6), and a second cavity (24) is formed in the outer ring of the spring sleeve (4), the outer ring of the valve head (2) and the valve body component (1).

4. An electronic expansion valve according to claim 2, wherein the first cavity (22) is arranged between the shaft connection cap (31) and a nut assembly (6);

a balance hole (33) is formed in the shaft connecting cap (31), and the balance hole (33) and the balance groove (32) form a balance channel for communicating the first cavity (22) and the third cavity (21);

and a second cavity (24) is formed in the outer ring of the spring sleeve (4), the outer ring of the valve head (2) and the valve body assembly (1).

5. An electronic expansion valve according to claim 3, wherein a first seal (41) is arranged between the inner ring of the spring housing (4) and the outer ring of the valve head (3).

6. The electronic expansion valve according to claim 5, wherein the balance groove (32) is a turn-milled single groove structure provided at a lower portion of the valve plug shaft (3); the bottom of the valve core shaft (3) is provided with a pressing sheet mounting shaft (34);

a through hole seat (23) is arranged in the valve head (2), and after the valve core shaft (3) is inserted into the through hole seat (23), the bottom of the elastic element (71) is clamped at the top of the through hole seat (23); and a pressing sheet (35) is fixedly arranged on a pressing sheet mounting shaft (34) at the bottom of the valve core shaft (3) below the through hole seat (23).

7. An electronic expansion valve according to claim 4, wherein the balancing hole (33) is provided in the axial direction of the shaft connection cap (31); the balance hole (33) includes a plurality.

8. An electronic expansion valve according to claim 7, wherein the balance groove (32) is a turn-milled single groove structure or a spline type structure provided on the valve plug shaft (3).

9. An electronic expansion valve according to claim 8, wherein a second seal (42) is arranged between the inner ring of the spring housing (4) and the outer ring of the valve head (3).