WO2023030462A1 - Valve assembly and electronic expansion valve having same - Google Patents

Abstract

A valve assembly and an electronic expansion valve having same. The valve assembly comprises: a valve seat (10) provided with an upper valve cavity (10a) and a lower valve cavity (10b) communicated with each other in sequence, the valve seat (10) being provided with a valve port (14), and the valve port (14) being located on the end of the lower valve cavity (10b) distant from the upper valve cavity (10a); and a guide sleeve (20) arranged in the valve seat (10), the guide sleeve (20) passing through the upper valve cavity (10a) and the lower valve cavity (10b), the distance between the end of the guide sleeve (20) close to the valve port (14) and the valve port (14) is H, and the diameter of the lower valve cavity (10b) is D, wherein the ratio of H to D is between 0.4 and 0.6. The valve assembly and the electronic expansion valve can solve the problem in the prior art of relatively high noise caused by a refrigerant flowing through the electronic expansion valve during operation of a refrigeration system.

Description

Valve assembly and electronic expansion valve having same

This application claims the priority of the patent application with the application number 202122115734.2 and the invention name "electronic expansion valve" submitted to the State Intellectual Property Office of China on September 2, 2021; The priority of the patent application with the patent application number 202122112606.2 and the invention name "electronic expansion valve" at the Property Rights Office; it was submitted to the State Intellectual Property Office of China on September 2, 2021 with the application number 202122118124.8 and the invention name is "valve seat and The priority of the patent application for "electronic expansion valve with it"; the patent submitted to the State Intellectual Property Office of China on September 2, 2021 with the application number 202122112835.4 and the title of the invention as "valve assembly and electronic expansion valve with it" The priority of the application; the priority of the patent application with the application number 202122113454.8 and the invention name "valve seat" submitted to the State Intellectual Property Office of China on September 2, 2021.

technical field

The present application relates to the technical field of electronic expansion valves, in particular, to a valve assembly and an electronic expansion valve having the same.

Background technique

At present, the existing electronic expansion valve includes a housing, a valve seat and a guide sleeve. The housing has an accommodating cavity. The housing cover is arranged on the upper end of the valve seat. , and separate the accommodating cavity and the valve cavity into two independent chambers. However, in the existing solutions, the guide sleeve and the valve cavity are usually in a transitional fit, and there is turbulence generated when the fluid flows through the valve cavity. The turbulent flow will cause pressure pulsation, resulting in loud noise, which affects the user's comfort experience.

Contents of the invention

The present application provides a valve assembly and an electronic expansion valve having the same, so as to solve the problem of high noise of the electronic expansion valve in the prior art.

According to one aspect of the present application, a valve assembly is provided. The valve assembly includes: a valve seat, the valve seat has an upper valve chamber and a lower valve chamber connected in sequence, the valve seat has a valve port, and the valve port is located on the upper side of the lower valve chamber. One end of the valve cavity; the guide sleeve is set in the valve seat, and the guide sleeve is installed in the upper valve cavity and the lower valve cavity. The distance between the end of the guide sleeve and the valve port is H, and the distance between the end of the The diameter is D, wherein the ratio of H to D is between 0.4 and 0.6.

By setting the above structure, the guide sleeve is installed in the lower valve chamber, and at the same time, there is a distance between the end of the guide sleeve and the valve port, so that a pressure relief space can be formed between the guide sleeve and the lower valve chamber, which can not only ensure that the electronic expansion valve is The pressure in the lower valve chamber is stable during operation, reducing the turbulent flow generated when the fluid flows through the lower valve chamber, which can effectively reduce the noise of the electronic expansion valve during operation and ensure the normal use of the electronic expansion valve.

Further, the guide sleeve includes a third rod segment of the first segment and a second segment, the third rod segment and the second segment are arranged stepwise, and the diameter of the third rod segment is larger than that of the second segment. The third rod section of the first section and the second section are set in a stepped shape, and are arranged corresponding to the lower valve chamber, which is conducive to guiding the guide sleeve during the installation process, facilitating the installation of the guide sleeve, thereby improving assembly efficiency.

Further, the ratio of the diameter of the second section to the diameter of the lower valve cavity is between 0.5 and 0.8. Such setting increases the space between the second section and the lower valve cavity, and at the same time further improves the noise reduction effect of the device according to the principle of the resonant cavity.

Further, the ratio of the diameter of the third rod segment to the diameter of the lower valve cavity is between 0.8 and 1. Such setting makes there be a gap between the first section and the lower valve cavity, and at the same time, according to the principle of the resonant cavity, the noise reduction effect of the device is further improved.

Further, the diameter of the lower valve chamber is between 3mm and 6mm. Such setting can reduce the turbulent flow generated by the fluid in the lower valve chamber when the device is running, thereby reducing the noise during the running of the device.

Further, the height of the second segment is L, wherein the ratio of L to H is between 0.1 and 0.4. Through the above settings, the structural relationship between the guide sleeve and the lower valve cavity can be reasonably set, which not only facilitates the processing of the guide sleeve and the lower valve cavity, but also facilitates the assembly of the guide sleeve and the lower valve cavity, and can effectively reduce the flow of fluid The turbulence caused by the large vortex is generated when flowing through the lower valve cavity, thereby reducing the noise during the operation of the device.

Further, both sides of the guide sleeve have a tangent structure, and there is a balance channel between the tangent structure and the inner wall of the upper valve chamber. By setting the cut surface structure, it can be matched and connected with the lower valve cavity to form multiple gaps, which can further improve the noise reduction effect of the electronic expansion valve.

According to another aspect of the present application, an electronic expansion valve is provided, and the electronic expansion valve includes the above-mentioned valve assembly.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute improper limitations to the present application. In the attached picture:

Figure 1 shows a schematic cross-sectional view of a valve assembly in a first example provided by the present application;

Figure 2 shows a schematic cross-sectional view of the valve seat in the first example provided by the present application;

Fig. 3 shows the schematic structural view of the guide sleeve in the first example provided by the present application;

Fig. 4 shows a schematic cross-sectional view of the electronic expansion valve in the first example provided by the present application;

Fig. 5 shows a schematic diagram of the dimensions of the guide sleeve in the first example provided by the present application;

Fig. 6 shows a schematic cross-sectional view of the electronic expansion valve in the second example provided by the present application;

Figure 7 shows a schematic cross-sectional view of a valve seat in a second example provided by the present application;

Figure 8 shows a schematic diagram of the dimensions of the guide sleeve in the second example provided by the present application;

Fig. 9 shows a schematic cross-sectional view of the electronic expansion valve in the third example provided by the present application;

Fig. 10 shows a schematic diagram of the size of the guide sleeve and the valve seat after assembly in the third example provided by the present application;

Fig. 11 shows a schematic diagram of the dimensions of the guide sleeve in the third example provided by the present application;

Fig. 12 shows a schematic cross-sectional view of the valve seat in the fourth example provided by the present application;

Fig. 13 shows a schematic cross-sectional view of another embodiment of the valve seat in the fourth example provided by the present application;

Fig. 14 shows a schematic cross-sectional view of another embodiment of the valve seat in the fourth example provided by the present application;

Fig. 15 shows a schematic cross-sectional view of another embodiment of the valve seat in the fourth example provided by the present application;

Figure 16 shows a schematic structural view of the valve seat in the fifth example provided by the present application;

Figure 17 shows a partial enlarged view at E in Figure 16;

Fig. 18 shows a schematic diagram of the dimensions of the valve seat in the fifth example provided by the present application.

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10, valve seat; 10a, upper valve cavity; 10b, lower valve cavity; 11, first valve cavity; 12, second valve cavity; 13, third valve cavity; 131, upper cavity of third valve cavity; 132, second valve cavity Three valve cavity lower cavity; 133, third valve cavity main cavity; 14, valve port; 141, first transition hole section; 1411, first end; 1412, second end; 142, second transition hole section;

15, the first connecting hole; 151, the first straight hole section; 152, the first tapered hole section; 153, the second straight hole section; 154, the second tapered hole section; 16, the second connecting hole;

17. The first connection port; 18. The second connection port;

20, guide sleeve; 21, first section; 21a, first section; 21b, second section; 21c, third section; 22, second section; 23, section structure;

30. Shell; 31. Accommodating cavity; 40. Nut cover; 50. Screw rod; 60. Valve needle assembly.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

As shown in FIGS. 1 to 3 , the embodiment of the present application provides a valve assembly, which includes: a valve seat 10 and a guide sleeve 20 . Wherein, the valve seat 10 has an upper valve cavity 10a and a lower valve cavity 10b connected in sequence, the valve seat 10 has a valve port 14, and the valve port 14 is located at an end of the lower valve cavity 10b away from the upper valve cavity 10a; the guide sleeve 20 is arranged on The valve seat 10, and the guide sleeve 20 is installed in the upper valve cavity 10a and the lower valve cavity 10b, the distance between the end of the guide sleeve 20 near the valve port 14 and the valve port 14 is H, and the diameter of the lower valve cavity 10b is D, wherein the ratio of H to D is between 0.4 and 0.6. By setting the above structure, the guide sleeve 20 is installed in the lower valve chamber 10b, and the end of the guide sleeve 20 has a distance from the valve port 14, so that a balanced passage can be formed between the guide sleeve 20 and the lower valve chamber 10b, which can not only Ensure that the pressure in the lower valve chamber 10b is stable during the operation of the electronic expansion valve, and reduce the turbulence generated when the fluid flows through the lower valve chamber 10b, so that the noise during the operation of the electronic expansion valve can be effectively reduced, and the normal operation of the electronic expansion valve is guaranteed. use.

Through the technical solution provided by this application, the guide sleeve 20 is penetrated and connected with the lower valve chamber 10b, and there is a distance between the end of the guide sleeve 20 and the valve port 14, so that a gap between the guide sleeve 20 and the lower valve chamber 10b can be formed. The pressure relief space and the principle of the resonant cavity can effectively reduce the pressure fluctuation when the fluid flows through the lower valve chamber 10b, thereby reducing the noise during the operation of the electronic expansion valve and ensuring the normal use of the electronic expansion valve.

Further, the guide sleeve 20 includes a third rod segment 21c and a second segment 22 of the first segment 21, the third rod segment 21c and the second segment 22 are arranged in steps, and the diameter of the third rod segment 21c is larger than the diameter of the second segment 22 . The third rod section 21c and the second section 22 are arranged in a stepped shape, and are arranged corresponding to the lower valve chamber 10b, which is beneficial to guide the guide sleeve 20 during installation, and facilitates the installation of the guide sleeve 20, thus improving the Assembly efficiency.

As shown in FIG. 5, the diameter of the second section 22 is D2. Specifically, the ratio of the diameter D2 of the second section 22 to the diameter of the lower valve cavity 10b is between 0.5 and 0.8. Such arrangement increases the space between the second section 22 and the lower valve chamber 10b, reduces turbulent flow, and further improves the noise reduction effect of the device.

As shown in FIG. 5, the diameter of the third rod segment 21c is D1. Further, the ratio of the diameter D1 of the third rod segment 21c to the diameter of the lower valve chamber 10b is between 0.8 and 1. Such setting makes there be a gap between the first section 21 and the lower valve chamber 10b, and at the same time further improves the noise reduction effect of the device according to the principle of the resonant cavity.

Specifically, the diameter of the lower valve chamber 10b is between 3mm and 5mm. Such an arrangement can reduce the turbulent flow generated by the fluid in the lower valve chamber 10b during the operation of the device, thereby reducing the noise during the operation of the device. Specifically, the diameter of the lower valve chamber 10b may be 3mm, 5mm or 6mm.

Further, the height of the second section 22 is L, wherein the ratio of L to H is between 0.1 and 0.4. Through the above settings, the structural relationship between the guide sleeve 20 and the lower valve chamber 10b can be reasonably set, which not only facilitates the processing of the guide sleeve 20 and the lower valve chamber 10b, but also facilitates the assembly of the guide sleeve 20 and the lower valve chamber 10b. It can also effectively reduce the turbulent flow caused by the large eddy when the fluid flows through the lower valve cavity 10b, thereby reducing the noise during the operation of the device.

Specifically, both sides of the guide sleeve 20 have a cut surface structure 23, and there is a balance channel between the cut surface structure 23 and the inner wall of the upper valve cavity 10a. By setting the cut surface structure 23, it can be mated with the lower valve cavity 10b to form a plurality of gaps, which can further improve the noise reduction effect of the electronic expansion valve.

As shown in FIG. 4 , according to another aspect of the present application, an electronic expansion valve is provided, and the electronic expansion valve includes the valve assembly provided in the above embodiments.

Through the technical solution provided by this application, the guide sleeve 20 is installed in the lower valve cavity 10b, and the end of the guide sleeve 20 has a distance from the valve port 14, so that a balanced channel can be formed between the guide sleeve 20 and the lower valve cavity 10b , not only can ensure the stability of the pressure in the lower valve chamber 10b when the electronic expansion valve is running, but also reduce the turbulence generated when the fluid flows through the lower valve chamber 10b, so that the noise during the operation of the electronic expansion valve can be effectively reduced, ensuring that the electronic expansion valve For normal use of the valve, the guide sleeve 20 is provided with a cut surface structure 23. By setting the cut surface structure 23, it can be matched with the lower valve cavity 10b to form multiple gaps, which can further improve the noise reduction effect of the electronic expansion valve.

As shown in FIGS. 6 and 7 , the embodiment of the present application provides a valve assembly, which includes: a valve seat 10 and a guide sleeve 20 . Wherein, the valve seat 10 has a first valve chamber 11, a second valve chamber 12 and a third valve chamber 13 which are sequentially arranged in a stepped shape, and a valve port 14 is also arranged on the valve seat 10, and the valve port 14 is located in the third valve chamber 13. One end away from the second valve cavity 12, the guide sleeve 20 is penetrated in the first valve cavity 11, the second valve cavity 12 and the third valve cavity 13, and is fixedly connected with the valve seat 10, the guide sleeve 20 and the first valve cavity The inner wall of the chamber 11 has a first gap δ1, the guide sleeve 20 and the inner wall of the second valve chamber 12 have a second gap δ2, the guide sleeve 20 and the inner wall of the third valve chamber 13 have a third gap δ3, and the second gap δ2 is 1mm between 0.2mm and 1mm, and the third gap δ3 is between 0.2mm and 1mm. By setting the above structure, the valve cavity in the valve seat 10 is set in a stepped shape, the guide sleeve 20 is connected with the valve cavity, and has a gap with the inner wall of the valve cavity, and the second gap δ2 is set between 1mm and 2mm, Set the third gap δ3 between 0.2mm and 1mm, so that the second gap δ2 and the third gap δ3 together form a balanced channel, which can not only ensure the stability of the pressure in the valve cavity, but also reduce the turbulence generated when the fluid flows through the valve cavity Noise can also reduce the overall volume of the device, which can reduce the production cost of the device, and can also effectively reduce the noise during the operation of the electronic expansion valve, ensuring the normal use of the electronic expansion valve.

Through the technical solution provided by this application, the valve cavity in the valve seat 10 is set in a stepped shape, so that the guide sleeve 20 is connected with the valve cavity and has a gap with the inner wall of the valve cavity. The small resonance when the fluid flows through the valve cavity reduces the noise when the electronic expansion valve is running and ensures the normal use of the electronic expansion valve.

Further, the third valve chamber 13 is divided into the third valve chamber upper chamber 131 and the third valve chamber lower chamber 132, and the diameters of the first valve chamber 11, the second valve chamber 12 and the third valve chamber upper chamber 131 are close to the valve chamber. The direction of the port 14 decreases successively. The diameter of the valve cavity is set to decrease successively, which is beneficial to guide the guide sleeve 20 during the installation process, which facilitates the installation of the guide sleeve 20 and improves the installation efficiency.

As shown in Figure 8, the height of the first valve cavity 11 is H1, the height of the second valve cavity 12 is H2, the height of the third valve cavity 13 is H3, the diameter of the first valve cavity 11 is D3, the second valve cavity The diameter of 12 is D4, and the diameter of the third valve chamber 13 is D5.

Specifically, the ratio of the diameter D4 of the second valve chamber 12 to the diameter D3 of the first valve chamber 11 is between 0.6 and 0.8. Such setting makes the diameters of the second valve cavity 12 and the first valve cavity 11 change more smoothly, which facilitates the processing of the valve cavity, and at the same time, according to the principle of the resonant cavity, the valve cavity has a certain noise reduction effect.

Further, the ratio of the diameter D5 of the third valve chamber 13 to the diameter D4 of the second valve chamber 12 is between 0.6 and 0.8. Such setting makes the diameters of the third valve cavity 13 and the second valve cavity 12 change relatively smoothly, which facilitates the processing of the valve cavity, and at the same time, according to the principle of the resonant cavity, the valve cavity has a certain noise reduction effect.

Further, the ratio of the height H2 of the second valve chamber 12 to the height H1 of the first valve chamber 11 is between 0.8 and 1.2. Such setting makes the height change between the second valve cavity 12 and the first valve cavity 11 relatively gentle, which facilitates the processing of the valve cavity, and at the same time, according to the principle of the resonant cavity, the valve cavity has a certain noise reduction effect.

Further, the ratio of the height H3 of the third valve chamber 13 to the height H2 of the second valve chamber 12 is between 1.2 and 1.6. Such setting makes the height change between the third valve cavity 13 and the second valve cavity 12 relatively gentle, which facilitates the processing of the valve cavity, and at the same time, according to the principle of the resonant cavity, the valve cavity has a certain noise reduction effect.

In this embodiment, the heights of the first valve cavity 11 , the second valve cavity 12 and the third valve cavity 13 increase sequentially toward the valve port 14 . The height of the valve cavity is set to increase sequentially, which can not only meet the installation requirements of the guide sleeve 20, but also increase the fluid flow space in the valve cavity as much as possible.

As shown in Figure 3, the first segment 21 has a first rod segment 21a, a second rod segment 21b and a third rod segment 21c which are sequentially connected in the axial direction, between the first rod segment 21a and the inner wall of the first valve chamber 11 The first gap δ1 is formed, and the guide sleeve 20 is also provided with a tangent structure 23, which is located on the side walls of the second rod segment 21b and the third rod segment 21c, and the tangent structure 23 is axially along the second rod segment One end of 21b connected with the first rod segment 21a extends to the end of the third rod segment 21c, and a second gap δ2 is formed between the cut surface structure 23 and the inner wall of the second valve cavity 12, and the cut surface structure 23 and the third valve cavity 13 A third gap δ3 is formed between the inner walls. In this embodiment, the maximum gap value of the second gap δ2 is set between 1 mm and 2 mm, and the maximum gap value of the third gap δ3 is set between 0.2 mm and 1 mm.

By arranging the above structure, the cut surface structure 23 can not only meet the fixing requirements of the guide sleeve 20 and the valve seat 10, but also form a gap between the guide sleeve 20 and the valve seat 10, and the above design structure is simple, easy to process, and low in manufacturing cost. .

Further, two cut surface structures 23 are arranged on the guide sleeve 20 , and the two cut surface structures 23 are symmetrically arranged on both sides of the guide sleeve 20 . By providing a plurality of cut surface structures 23, it can be matched with the valve cavity to form a plurality of gaps, which can further improve the noise reduction effect of the electronic expansion valve.

Further, the first gap δ1 is between 2mm and 4mm. Such arrangement can utilize the principle of the resonant cavity to effectively reduce the noise when the fluid flows through the valve cavity.

Through the technical solution provided by this application, the valve cavity in the valve seat 10 is set in a stepped shape, so that the guide sleeve 20 is connected with the valve cavity and has a gap with the inner wall of the valve cavity. δ2 is set between 1mm and 2mm, and the third gap δ3 is set between 0.2mm and 1mm, so that the second gap δ2 and the third gap δ3 together form a balanced channel, which not only ensures the stability of the pressure in the valve cavity, but also reduces The resonance generated when the fluid flows through the valve cavity can also reduce the overall volume of the device, which can reduce the production cost of the device, and can also effectively reduce the turbulent noise when the fluid flows through the valve cavity, thereby reducing the The noise during operation of the electronic expansion valve ensures the normal use of the electronic expansion valve. At the same time, by arranging a plurality of cut surface structures 23 , it can be matched with the valve chamber to form a plurality of gaps, which can improve the noise reduction effect of the electronic expansion valve and further reduce the noise during the operation of the electronic expansion valve.

As shown in FIG. 9 , FIG. 7 and FIG. 3 , the present application provides an electronic expansion valve. The electronic expansion valve includes a valve assembly, and the valve assembly includes: a valve seat 10 and a guide sleeve 20 . Wherein, the valve seat 10 has the first valve chamber 11, the second valve chamber 12, the third valve chamber upper chamber 131 and the third valve chamber 13 connected in sequence, the first valve chamber 11, the second valve chamber 12 and the third valve chamber The upper cavity 131 of the valve cavity is set in a stepped shape, the valve port 14 is located at the end of the third valve cavity 13 away from the first valve cavity 11, and the guide sleeve 20 is installed in the first valve cavity 11, the second valve cavity 12, the third valve cavity In the upper cavity 131 of the cavity and the main cavity 133 of the third valve cavity, the first segment 21 has a first rod segment 21a, a second rod segment 21b and a third rod segment 21c which are sequentially connected in the axial direction, and the first rod segment 21a and the third rod segment A first gap is formed between the inner walls of a valve cavity 11, and two cut surface structures 23 are symmetrically arranged on the side wall of the guide sleeve 20, and the cut surface structures 23 are located on the side walls of the second rod section 21b and the third rod section 21c, and The tangent structure 23 extends axially along the end of the second rod segment 21b connected to the first rod segment 21a to the end of the third rod segment 21c. There is a second gap, the first gap, the second gap and the third valve cavity 13 communicate with each other, and the ratio of the distance between the two tangent structures 23 to the diameter of the upper cavity 131 of the third valve cavity is between 0.85 and 0.96.

Wherein, when the ratio of the distance between the two cut surface structures 23 to the diameter of the third valve chamber upper chamber 131 is less than 0.85, the gap between the cut surface structure 23 and the third valve chamber upper chamber 131 will be increased, and the fluid flow through the balance channel will be increased. flow; when the ratio of the distance between the two tangent structures 23 to the diameter of the third valve chamber upper cavity 131 is greater than 0.96, the gap between the tangent structure 23 and the third valve cavity upper cavity 131 will be reduced, and the fluid flow through the balance channel will be reduced. Flow rate, the above two settings will weaken the pressure buffer effect of the balance channel, thereby reducing the noise reduction effect of the balance channel. Therefore, in this application, setting the ratio of the distance between the two tangent structures 23 to the diameter of the third valve chamber upper chamber 131 between 0.85 and 0.96 can ensure the pressure buffering effect of the balance channel and improve the noise reduction effect. Specifically, the ratio of the distance between the two cut surface structures 23 to the diameter of the upper chamber 131 of the third valve chamber may be 0.85, 0.9 or 0.96.

By setting the above-mentioned structure, two tangent structures 23 are set on the side wall of the guide sleeve 20, so that the tangent structure 23 can have a gap with the second valve cavity 12 and the third valve cavity upper cavity 131, and the distance between the two tangent structures 23 The ratio to the diameter of the third valve chamber upper chamber 131 is between 0.85 and 0.96, through which the third valve chamber main chamber 133 and the first valve chamber 11, the second valve chamber 12 and the third valve chamber upper chamber 131 to form a balance channel, which can keep the pressure in the third valve chamber main chamber 133 consistent with the hole section, and then can also reduce the pressure fluctuation caused by turbulent flow when the fluid flows through the third valve chamber main chamber 133, through The balance channel reduces the pressure fluctuation, thereby reducing the noise generated when the refrigerant flows through the electronic expansion valve, and improving user comfort experience.

Through the technical solution provided by this application, two tangent structures 23 are provided on the side wall of the guide sleeve 20, and the first valve chamber 11, the second valve chamber 12, the upper chamber 131 of the third valve chamber and the main chamber 133 of the third valve chamber The step setting makes there be a gap between the cut surface structure 23 and the upper cavity 131 of the third valve cavity. Using the principle of resonance cavity, not only the main cavity 133 of the third valve cavity and the first valve cavity 11, the second valve cavity 12, and the third valve cavity The pressure of the upper chamber 131 is kept consistent, and the pressure pulsation generated when the fluid flows through the main chamber 133 of the third valve chamber can also be reduced, thereby reducing the noise of the refrigerant flowing through the electronic expansion valve and improving user comfort.

As shown in Figure 10, the length of the upper chamber 131 of the third valve chamber is L1, the diameter of the upper chamber 131 of the third valve chamber is D6, and the interval between the two cut surface structures 23 is S, L1=0.5*(D6-S)* (1.2～3.5). Such setting, using the principle of resonant cavity, makes the cooperation between the cut surface structure 23 and the upper chamber 131 of the third valve chamber more reasonable, reduces the noise during the operation of the device, and meanwhile the cut surface structure 23 can reduce the volume of the guide sleeve 20 and reduce the production cost of the device. Specifically, the numerical range in the above formula can be selected as 1.2, 2, 3 or 3.5.

Specifically, the second rod section 21b is in transition fit or interference fit with the second valve cavity 12 , and the second rod section 21b is used to limit the relative displacement between the guide sleeve 20 and the valve seat 10 . Through the above arrangement, the guide sleeve 20 can be fixedly connected with the valve seat 10 to prevent the guide sleeve 20 from being displaced during the operation of the device, thereby ensuring the stability of the device during operation.

Further, the second rod section 21b and the third rod section 21c are arranged in steps, the second rod section 21b is arranged corresponding to the second valve chamber 12, and the third rod section 21c is installed in the upper chamber 131 of the third valve chamber and the third valve chamber. In the main cavity 133 of the cavity. The second rod section 21b and the third rod section 21c are arranged in a stepped shape, and are respectively arranged corresponding to the second valve chamber 12, the third valve chamber upper chamber 131 and the third valve chamber main chamber 133, which is beneficial to installation During the process, the guide sleeve 20 is guided to facilitate the installation of the guide sleeve 20, thereby improving the assembly efficiency.

Specifically, the diameter of the main chamber 133 of the third valve chamber is smaller than the diameter of the upper chamber 131 of the third valve chamber. In this way, the resonance generated when the fluid flows through the main chamber 133 of the third valve chamber can be reduced, thereby reducing the noise during the operation of the device.

As shown in FIG. 11, the diameter of the third rod section 21c is d1. The ratio between the diameter d1 of the third rod section 21c and the diameter of the upper chamber 131 of the third valve chamber is between 0.85 and 1. Such setting makes there be a gap between the third rod section 21c and the upper chamber 131 of the third valve chamber, and at the same time, according to the principle of the resonant chamber, the noise reduction effect of the device is further improved. If the ratio between the third rod section 21c and the upper chamber 131 of the third valve chamber is set to be less than 0.85 or greater than 1, it will increase the airflow sound when the fluid flows through the gap, thereby affecting the noise reduction effect of the device.

Specifically, the gap between the first rod section 21 a and the first valve cavity 11 is between 2 mm and 4 mm, and the gap between the cut surface structure 23 and the second valve cavity 12 is between 1 mm and 2 mm. In this way, the above-mentioned gaps can jointly form a balanced channel, which can not only ensure the stability of the pressure in the hole section, but also reduce the pressure pulsation generated when the fluid flows through the main cavity 133 of the third valve cavity, and further improve the noise reduction effect of the device . In this embodiment, the gap between the first rod segment 21a and the first valve cavity 11 may be 2 mm, 3 mm or 4 mm. Specifically, the gap between the cut surface structure 23 and the second valve cavity 12 may be 1 mm, 1.5 mm or 2 mm.

Further, the electronic expansion valve further includes: a casing 30 , a nut sleeve 40 , a screw rod 50 and a valve needle assembly 60 . Wherein, the shell 30 is connected with the valve seat 10, and there is a housing cavity 31 between the shell 30 and the valve seat 10, the nut sleeve 40 is arranged in the housing cavity 31, the screw rod 50 is movably arranged in the housing cavity 31, and the screw rod 50 is penetrated in the On the nut sleeve 40, and threadedly connected with the nut sleeve 40, the valve needle assembly 60 is movably arranged in the guide sleeve 20, and one end of the valve needle assembly 60 is connected with the screw rod 50, and the screw rod 50 drives the valve needle assembly 60 to move to open or Block valve port 14. By moving the needle assembly 60 between the open position and the closed position, the receiving cavity 31 can be communicated with the main cavity 133 of the third valve cavity, and the pressure in the receiving cavity 31 can be consistent with the main cavity 133 of the third valve cavity, ensuring that stability during device operation.

Through the technical solution provided by this application, two tangent structures 23 are provided on the side wall of the guide sleeve 20, and the first valve chamber 11, the second valve chamber 12, the upper chamber 131 of the third valve chamber and the main chamber 133 of the third valve chamber The step setting makes there be a gap between the cut surface structure 23 and the upper cavity 131 of the third valve cavity. Using the principle of resonance cavity, not only the main cavity 133 of the third valve cavity and the first valve cavity 11, the second valve cavity 12, and the third valve cavity The pressure in the upper cavity 131 of the cavity is kept consistent, and a pressure buffer cavity is formed in the accommodation cavity 31. At the same time, the pressure fluctuation caused by the turbulent flow of the fluid flowing through the main cavity 133 of the third valve cavity can be reduced. This pressure fluctuation can be reduced, thereby reducing the noise generated when the refrigerant flows through the electronic expansion valve, ensuring the normal use of the electronic expansion valve and improving user comfort. At the same time, the second rod section 21b and the second valve cavity 12 are transition fit or interference fit, which can fix the guide sleeve 20 and the valve seat 10, and prevent the guide sleeve 20 from being displaced during the operation of the device, thus ensuring the operation of the device. time stability.

As shown in Fig. 12 to Fig. 15, the valve seat 10 has a first valve chamber 11, a second valve chamber 12 and a third valve chamber 13 arranged successively in a stepped shape, and the valve port 14 is located at the end of the third valve chamber 13 away from the second valve chamber. One end of the valve chamber 12; the side wall of the valve seat 10 is provided with a first connection hole 15, and the end of the valve seat is provided with a second connection hole 16, the first connection hole 15 communicates with the third valve chamber 13, and the second connection The hole 16 communicates with the valve port 14, the axis of the first connecting hole 15 is perpendicular to the axis of the third valve cavity 13, the axis of the second connecting hole 16 coincides with the axis of the third valve cavity 13, and the end of the first connecting hole 15 Located on the inner wall of the third valve chamber 13, the end of the first connecting hole 15 has a first straight hole section 151 and a first tapered hole section 152 connected to each other, and the cone angle of the first tapered hole section 152 is between 80° and 170° between. Specifically, the taper angle of the first taper hole segment 152 may be 80°, 100° or 170°. As shown in FIG. 12 , the taper angle of the first taper hole section 152 is denoted as A. As shown in FIG.

Wherein, when the cone angle of the first tapered hole section 152 is less than 80°, the volume of the first connecting hole 15 will be reduced, and the flow rate of the fluid flowing through the first connecting hole 15 will also be reduced; when the first tapered hole When the cone angle of the section 152 is greater than 170°, the volume of the first connecting hole 15 will be increased, and the flow rate of the fluid flowing through the first connecting hole 15 will also be increased at this time. The above two settings will weaken the first connecting hole 15. noise reduction effect. Therefore, in this application, setting the taper angle of the first taper hole section 152 between 80° and 170° can ensure the buffering effect of the refrigerant passing through the first connection hole 15 and improve the noise reduction effect.

By setting the above structure, the first connection hole 15 is provided on the side wall of the valve seat, and the axis of the first connection hole 15 is perpendicular to the axis of the third valve chamber 13, and the fluid can flow into the first connection hole 15 when the device is running. At the same time, the first connection hole 15 includes a first tapered hole section 152. The cone angle of the first tapered hole section 152 is between 80° and 170°, and the fluid can be buffered by the cone angle, so that the electrons can be effectively reduced. The noise during the operation of the expansion valve ensures the normal use of the electronic expansion valve.

Further, the third valve chamber 13 has an upper chamber 131 of the third valve chamber, a main chamber 133 of the third valve chamber and a lower chamber 132 of the third valve chamber arranged in sequence along the axis, and the valve port 14 is located in the lower chamber 132 of the third valve chamber. The end of the upper chamber 131 away from the third valve chamber, the first connecting hole 15 is partly located in the main chamber 133 of the third valve chamber. In this way, the gas-liquid separation of the fluid passing through the third valve cavity 13 can be performed, and the fluid can flow out through the valve port 14, which reduces the contact between the fluid and the inner wall of the third valve cavity 13, thereby reducing the noise during device operation. Through the above setting, when the fluid flows from the first connection hole 15 to the third valve chamber 13, the fluid and the gas in the third valve chamber 13 will form stratification, and the fluid will flow as much liquid as possible into the third valve chamber 13 under the action of gravity. The lower chamber 132 of the three valve chambers reduces the discontinuous noise when the two-phase refrigerant flows into the valve port, thereby achieving the purpose of reducing noise.

As shown in FIG. 12 , the height of the lower cavity 132 of the third valve cavity is denoted as H4. Specifically, the height of the lower chamber 132 of the third valve chamber is between 0.3mm and 4mm. Wherein, when the height of the lower chamber 132 of the third valve chamber is less than 0.3 mm, the effect of gas-liquid stratification of the fluid will be reduced, thereby affecting the noise reduction effect of the third valve chamber 13; when the height of the lower chamber 132 of the third valve chamber is When the height is greater than 4 mm, the volume of the third valve chamber 13 will be correspondingly increased, thereby increasing the production cost of the third valve chamber 13 . Therefore, in this application, the height of the lower cavity 132 of the third valve cavity is between 0.3mm and 4mm, which can reduce the volume of the third valve cavity 13 as much as possible while ensuring the noise reduction effect of the third valve cavity 13 . Specifically, the height of the lower chamber 132 of the third valve chamber may be 0.3mm, 2mm or 4mm.

As shown in FIG. 12 , the length of the first straight hole section 151 is denoted as L2. Further, the length of the first straight hole section 151 is set between 0.3mm and 3mm. Wherein, when the length of the first straight hole section 151 is less than 0.3mm, the buffering effect of the first straight hole section 151 on fluid turbulence will be weakened; when the length of the first straight hole section 151 is greater than 3mm, the second The length of the straight hole section 151 will make the side wall of the valve body thinner and reduce the structural strength of the valve seat. Therefore, in this application, setting the length of the first straight hole section 151 between 0.3mm and 3mm can reduce the turbulent flow generated when the fluid flows into the first straight hole section 151, and reduce the flow rate of the fluid in the first straight hole section 151. Therefore, the impact of the fluid on the inner wall of the third valve cavity 13 can be reduced, thereby further improving the noise reduction effect of the device and ensuring the overall structural strength of the device. Specifically, the length of the first straight hole section 151 is 0.3mm, 2mm or 3mm.

Specifically, the ratio of the height of the lower chamber 132 of the third valve chamber to the diameter of the first straight hole section 151 is between 0.05 and 0.5. In this way, the cooperation between the lower cavity 132 of the third valve cavity and the first straight hole section 151 is more reasonable, and the structural strength of the third valve cavity 13 is improved while reducing the impact of the fluid on the inner wall of the third valve cavity.

Further, the first tapered hole section 152 has a first end and a second end oppositely disposed, the first end is connected to the first straight hole section 151 , and the diameter of the first end is the same as that of the first straight hole section 151 . In this way, the fluid can flow from the third valve cavity 13 into the first tapered hole section 152. Since the first tapered hole section 152 has a buffering effect, the flow velocity of the fluid can be effectively reduced, thereby further reducing the noise during the operation of the device. .

As shown in Figure 13, in another example of the present application, the first tapered hole section 152 has a first end and a second end oppositely arranged, the first end is connected with the first straight hole section 151, and the diameter of the first end is smaller than The diameter of the first straight hole section 151 . In this way, the first tapered hole section 152 can be used in conjunction with the first straight hole section 151, which improves the consistency of the structure of the first connecting hole 15 and ensures the stability of the device during operation.

As shown in Figure 14, in another example of the present application, the first connecting hole 15 also includes a second straight hole section 153, the first straight hole section 151, the second straight hole section 153 and the first tapered hole section 152 in sequence connected, and the diameter of the second straight hole section 153 is smaller than the diameter of the first straight hole section 151, the first tapered hole section 152 has a first end and a second end oppositely arranged, and the first end is connected with the second straight hole section 153 , the diameter of the first end is the same as the diameter of the second straight hole section 153 . In this way, the transition of the first straight hole section 151 can be smoother, thereby further reducing the noise during the operation of the device.

In yet another example of the present application, the first connection hole 15 further includes a second tapered hole section 154 , and the first straight hole section 151 , the second tapered hole section 154 and the first tapered hole section 152 communicate in sequence. In other embodiments, the taper angle of the second taper hole section 154 is set between 70° and 170°, which is convenient for users to select different valve seats according to different use environments, and improves the applicability of the device. As shown in FIG. 15 , the taper angle of the second taper hole section 154 is denoted as B. Specifically, the taper angle of the second tapered hole segment 154 may be 70°, 90° or 170°.

As shown in Figures 16 to 18, the valve seat is provided with a first connection port 17 and a second connection port 18, the first connection port 17 communicates with the lower valve cavity 10b, and the valve seat is also provided with sequentially connected valve ports 14 and the first transition hole section 141, specifically, the valve port 14 communicates with the third valve cavity 13, the first transition hole section 141 has a first end 1411 and a second end 1412 oppositely arranged, the first end 1411 and the valve port 14 communicates, the second end 1412 communicates with the second connection port 18, the first transition hole section 141 is a tapered structure, the aperture of the first end 1411 is smaller than the aperture of the second end 1412, the cone angle of the first transition hole section 141 The angle is between 15° and 60°. Specifically, the taper angle of the first transition hole segment 141 is a, and a may be 15°, 45° or 60°. In this embodiment, a is 30°.

Applying the technical solution of the present application, the valve seat includes a third valve cavity 13 , a first connection port 17 , a second connection port 18 , a valve port 14 and a first transition hole section 141 . Wherein, the first transition hole segment 141 is a tapered structure, and the aperture of the first end 1411 is smaller than the aperture of the second end 1412, so that the diameter of the channel through which the fluid flows can gradually increase, greatly reducing the occurrence of sudden changes, and at the same time The increased volume of a transition hole section can reduce the generation of fluid eddy and turbulent flow, so that the fluid can flow smoothly and stably, thereby reducing the generation of fluid noise; moreover, the above-mentioned structure can reduce the resistance generated by the flow channel.

Wherein, when the cone angle of the first transition hole section 141 is less than 15°, if the angle is too small, a large sudden change is likely to occur when the fluid flows in, the transition is poor, and turbulent flow is likely to occur, which in turn will generate noise during the fluid flow process; when the first When the taper angle of the transition hole section 141 is greater than 60°, the drainage effect of the inner wall of the first transition hole section 141 on the fluid will be weakened, so that the fluid cannot be buffered. Therefore, setting the taper angle of the first transition hole section 141 between 15° and 60° can have a good drainage and buffering effect on the fluid.

Specifically, the diameter of the first transition hole section 141 is greater than or equal to the diameter of the valve port 14 . The volume of the first transition hole section 141 is larger than that of the valve port 14, which can increase the flow rate, ensure the smoothness and stability of fluid flow, and further reduce the generation of fluid eddy and turbulent flow. If the pore diameter of the first transition hole section 141 is smaller than the pore diameter of the valve port 14, the diameter will suddenly decrease when the fluid flows, the pressure and flow velocity of the fluid will change, and eddy currents and turbulent flows are likely to be generated, resulting in fluid noise.

Specifically, the hole diameter of the first end 1411 is between 2.5mm and 5mm. If the aperture of the first end 1411 is less than 2.5 mm, it is easy to cause fluid to accumulate at the first end 1411, which is not conducive to the flow of the fluid and is prone to noise; if the aperture of the first end 1411 is greater than 5 mm, the design of the first transition hole section 141 It is a tapered structure, if the first end 1411 is too large, the first transition hole section 141 will be too large, which increases the volume of the valve seat, which is not conducive to the use of the valve seat. Specifically, the hole diameter of the first end 1411 is D7, and D7 may be 2.5mm, 3.5mm or 5mm. In this embodiment, D7 is 4mm.

Specifically, the axial length of the first transition hole section 141 is between 0.8 mm and 5 mm. When the axial length of the first transition hole section 141 is less than 0.8mm, the cavity of the first transition hole section 141 is reduced, and it cannot store more fluid, which will cause fluid accumulation, change the flow velocity and pressure of the fluid, and easily Vortex and turbulent flow are generated; when the length of the first transition hole section 141 is greater than 5 mm, the overall size of the valve seat is relatively large. Therefore, the axial length of the first transition hole section 141 is set between 0.8 mm and 5 mm, so that the valve seat can reduce the overall size of the valve seat as much as possible while meeting the requirements of reducing eddy flow, turbulent flow and reducing noise. Specifically, the axial length of the first transition hole section 141 is H5, and H5 may be 0.8 mm, 3 mm or 5 mm. In this embodiment, H5 is 4mm.

Further, the valve seat is also provided with a second transition hole section 142 , one end of the second transition hole section 142 communicates with the second end 1412 , and the other end of the second transition hole section 142 forms the second connection port 18 . The second transition hole section 142 communicates with the second end 1412. The fluid flows through the first transition hole section 141 and then enters the second transition hole section 142. The second transition hole section 142 can be used to further control the flow rate and pressure of the fluid to ensure fluid flow. The patency, after the fluid flows through the second transition hole section 142 , it can smoothly flow out from the second connection port 18 .

In this embodiment, the diameters of the second transition hole section 142 along the axial direction are the same, that is, the second transition hole section 142 is designed as a cylindrical hole, which can maintain the flow rate and pressure of the fluid through the cylindrical hole, making the fluid flow more smooth , to further reduce turbulence and eddy current generation.

Wherein, the aperture diameter of the second transition hole section 142 may be equal to the aperture diameter of the second end 1412 or larger than the aperture diameter of the second end 1412 . In this embodiment, the pore diameter of the second transition hole section 142 is equal to the pore diameter of the second end 1412, so that the sudden change in diameter of the fluid when flowing from the second end 1412 through the second transition hole section 142 can be avoided, so that the fluid flow is smoother. .

Furthermore, the outer diameter of the second transition hole section 142 is smaller than the outer diameter of the first transition hole section 141, which facilitates the connection of the external pipeline to the second connection port 18, so that the external pipeline can be smoothly inserted into the second connection port 18 to ensure the stability of the connection between the two.

Specifically, the axial length of the valve port 14 is between 0.5 mm and 2 mm, and the coaxiality of the valve needle and the valve port 14 can be ensured through the above setting. When the axial length of the valve port 14 is less than 0.5mm, the valve needle is prone to wear with the valve port 14 during the up and down movement process, which will reduce the service life of the valve needle; when the axial length of the valve port 14 is greater than 2mm, the speed of the fluid flowing through the valve port 14 is affected, which will cause a large pressure drop after the fluid flows through the sealing line of the valve port 14, affecting the smoothness of the fluid flow. Therefore, in this application, the axial length of the valve port 14 is between 0.5 mm and 2 mm, so as to reduce the wear of the valve needle while ensuring the coaxiality of the valve needle and the valve port 14, and prolong the length of the valve needle. Long service life, ensuring the smoothness of fluid flow. Specifically, the axial length of the valve port 14 is H6, where H6 can be 0.5mm, 1mm or 2mm. In this embodiment, H6 is 1.5 mm.

Furthermore, the ports at both ends of the valve port 14 are provided with chamfers. Through the above design, the flanging burrs produced by the processing of the valve port 14 can be effectively removed, and the noise generated when the fluid flows through the valve port 14 can be avoided.

Specifically, the size of the chamfer can be designed between C0.05mm and C0.15mm. When the size of the chamfer is smaller than C0.05mm, the flanging burr cannot be effectively removed, and then when the fluid flows through the valve port 14, relatively large Loud noise; when the size of the chamfer is larger than C0.15mm, the length dimension of the valve port 14 will be reduced, which in turn will affect the coaxiality between the valve port 14 and the valve needle. Therefore, setting the size of the chamfer between C0.05mm and C0.15mm can effectively remove burrs while ensuring the coaxiality between the valve port 14 and the valve needle, and reduce the noise generated when the fluid flows through the valve port 14. Specifically, the size of the chamfer may be C0.05mm, C0.1mm or C0.15mm.

In this technical solution, the first transition hole section 141 is designed below the valve port 14, which can reduce the resistance caused by the sudden change in the cross-sectional area of the flow channel, ensure the smooth flow of fluid, and reduce the generation of eddy current and turbulent flow; A second transition hole section 142 with the same hole diameter as the second end 1412 is designed under the transition hole section 141 to maintain a stable fluid flow and make it flow more smoothly.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the Authorized Specification. In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of the present application, it should be understood that orientation words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. indicate the orientation Or positional relationship is generally based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description. In the absence of a contrary statement, these orientation words do not indicate or imply the device or element referred to It must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as limiting the protection scope of the present application; the orientation words "inner and outer" refer to the inner and outer relative to the outline of each component itself.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. under other devices or configurations”. Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. To limit the protection scope of this application.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (44)

1. A valve assembly, characterized in that the valve assembly comprises:

   A valve seat (10), the valve seat (10) has an upper valve cavity (10a) and a lower valve cavity (10b) connected in sequence, the valve seat (10) has a valve port (14), and the valve port ( 14) Located at an end of the lower valve chamber (10b) away from the upper valve chamber (10a);

   The guide sleeve (20) is arranged in the valve seat (10), and the guide sleeve (20) is passed through the upper valve cavity (10a) and the lower valve cavity (10b), the guide The distance between the end of the sleeve (20) close to the valve port (14) and the valve port (14) is H, and the diameter of the lower valve chamber (10b) is D, wherein the ratio of H to D is Between 0.4 and 0.6.
2. The valve assembly according to claim 1, characterized in that, the guide sleeve (20) comprises a third rod segment (21c) of the first segment (21) and a second segment (22), the third rod segment (21c) is arranged stepwise with the second section (22), and the diameter of the third rod section (21c) is larger than the diameter of the second section (22).
3. The valve assembly according to claim 2, characterized in that the ratio of the diameter of the second section (22) to the diameter of the lower valve cavity (10b) is between 0.5 and 0.8.
4. The valve assembly according to claim 2, characterized in that the ratio of the diameter of the third rod section (21c) to the diameter of the lower valve cavity (10b) is between 0.8 and 1.
5. The valve assembly according to claim 1, characterized in that, the diameter of the lower valve chamber (10b) is between 3mm and 6mm.
6. The valve assembly according to claim 2, characterized in that the height of the second section (22) is L, wherein the ratio of L to H is between 0.1 and 0.4.
7. The valve assembly according to claim 1, characterized in that, both sides of the guide sleeve (20) have a tangent structure (23), and the tangent structure (23) and the inner wall of the upper valve chamber (10a) are There is a balanced channel between them.
8. The valve assembly of claim 2 wherein,

   The valve seat (10) has a first valve cavity (11), a second valve cavity (12) and a third valve cavity (13) which are sequentially arranged in a stepped shape, and the valve port (14) is located in the third valve cavity. An end of the valve cavity (13) away from the second valve cavity (12);

   The guide sleeve (20) is installed in the first valve cavity (11), the second valve cavity (12) and the third valve cavity (13), and is fixedly connected with the valve seat (10), so The guide sleeve (20) has a first gap with the inner wall of the first valve cavity (11), the guide sleeve (20) has a second gap with the inner wall of the second valve cavity (12), and the guide There is a third gap between the sleeve (20) and the inner wall of the third valve chamber (13), the second gap is between 1 mm and 2 mm, and the third gap is between 0.2 mm and 1 mm.
9. The valve assembly according to claim 8, characterized in that, the third valve chamber (13) includes the upper chamber (131) of the third valve chamber, the main chamber (133) of the third valve chamber and the third valve chamber connected in sequence. The valve chamber lower chamber (132), the diameters of the first valve chamber (11), the second valve chamber (12) and the third valve chamber upper chamber (131) are close to the valve port (14) direction decreases in turn.
10. The valve assembly according to claim 9, characterized in that the ratio of the diameter of the second valve cavity (12) to the diameter of the first valve cavity (11) is between 0.6 and 0.8.
11. The valve assembly according to claim 9, characterized in that the ratio of the diameter of the third valve chamber (13) to the diameter of the second valve chamber (12) is between 0.6 and 0.8.
12. The valve assembly according to claim 8, characterized in that, the heights of the first valve cavity (11), the second valve cavity (12) and the third valve cavity (13) are close to the valve The direction of the mouth (14) increases successively.
13. The valve assembly according to claim 8, characterized in that the ratio of the height of the second valve cavity (12) to the height of the first valve cavity (11) is between 0.8 and 1.2.
14. The valve assembly according to claim 8, characterized in that the ratio of the height of the third valve chamber (13) to the height of the second valve chamber (12) is between 1.2 and 1.6.
15. The valve assembly according to claim 9, characterized in that, the first segment (21) has a first rod segment (21a), a second rod segment (21b) and a third rod segment ( 21c), the first gap is formed between the first rod section (21a) and the inner wall of the first valve cavity (11), and the guide sleeve (20) is also provided with a cut surface structure (23), The cut surface structure (23) is located on the side walls of the second rod section (21b) and the third rod section (21c), and the cut surface structure (23) is axially along the second rod section ( 21b), one end connected to the first rod section (21a) extends to the end of the third rod section (21c), and the cut surface structure (23) and the inner wall of the second valve cavity (12) The second gap is formed between the cut surface structure (23) and the inner wall of the third valve chamber (13).
16. The valve assembly according to claim 15, characterized in that two tangent structures (23) are provided on the guide sleeve (20), and the two tangent structures (23) are symmetrically arranged on the guide sleeve. (20) both sides.
17. The valve assembly according to claim 16, characterized in that, the first gap, the second gap and the third valve chamber (13) communicate with each other, and the distance between the two tangent structures (23) is equal to The ratio of the diameters of the upper chamber (131) of the third valve chamber is between 0.85 and 0.96.
18. The valve assembly according to claim 17, characterized in that, the length of the upper chamber (131) of the third valve chamber is L1, the diameter of the upper chamber (131) of the third valve chamber is D6, and the two The interval of the section structure (23) is S, L1=0.5*(D6-S)*(1.2-3.5).
19. The valve assembly according to claim 17, characterized in that, the second rod section (21b) and the second valve chamber (12) are transition fit or interference fit, and the second rod section (21b) It is used to limit the relative displacement between the guide sleeve (20) and the valve seat (10).
20. The valve assembly according to claim 17, characterized in that, the second rod section (21b) and the third rod section (21c) are arranged in steps, and the second rod section (21b) corresponds to the first Two valve chambers (12) are provided, and the third rod section (21c) is penetrated in the upper chamber (131) of the third valve chamber and the main chamber (133) of the third valve chamber.
21. The valve assembly according to claim 17, characterized in that, the diameter of the main chamber (133) of the third valve chamber is smaller than the diameter of the upper chamber (131) of the third valve chamber.
22. The valve assembly according to claim 17, characterized in that, the ratio between the diameter of the third rod section (21c) and the diameter of the upper chamber of the third valve chamber (131) is between 0.85 and 1.
23. The valve assembly according to claim 17, characterized in that, the gap between the first rod section (21a) and the first valve chamber (11) is between 2mm and 4mm, and the cut surface structure (23 ) and the gap between the second valve cavity (12) is between 1mm and 2mm.
24. The valve assembly according to claim 1, characterized in that, the valve seat (10) has a first valve chamber (11), a second valve chamber (12) and a third valve chamber (13) which are sequentially arranged in a stepped shape ), the valve port (14) is located at the end of the third valve cavity (13) away from the second valve cavity (12); the side wall of the valve seat (10) is provided with a first connecting hole (15), the end of the valve seat is provided with a second connection hole (16), the first connection hole (15) communicates with the third valve cavity (13), and the second connection hole (16 ) communicates with the valve port (14), the axis of the first connection hole (15) is perpendicular to the axis of the third valve cavity (13), the axis of the second connection hole (16) is perpendicular to the axis of the The axes of the third valve cavity (13) are coincident, the ends of the first connection hole (15) are located on the inner wall of the third valve cavity (13), and the ends of the first connection hole (15) have mutually The connected first straight hole section (151) and the first tapered hole section (152), the taper angle of the first tapered hole section (152) is between 80° and 170°.
25. The valve assembly according to claim 24, characterized in that, the third valve chamber (13) has a third valve chamber upper chamber (131), a third valve chamber main chamber (133) and a third valve chamber main chamber (133) arranged in sequence along the axis. The third valve chamber lower chamber (132), the valve port (14) is located at the end of the third valve chamber lower chamber (132) away from the third valve chamber upper chamber (131), the first The connecting hole (15) is partially located in the main chamber (133) of the third valve chamber.
26. The valve assembly according to claim 25, characterized in that, the height of the lower chamber (132) of the third valve chamber is between 0.3mm and 4mm.
27. The valve assembly according to claim 24, characterized in that, the length of the first straight hole section (151) is between 0.3mm and 3mm.
28. The valve assembly according to claim 25, characterized in that, the ratio of the height of the third valve chamber lower chamber (132) to the diameter of the first straight hole section (151) is between 0.05 and 0.5.
29. The valve assembly according to claim 24, characterized in that, the first tapered hole section (152) has a first end and a second end oppositely arranged, and the first end is connected to the first straight hole section ( 151) connection, the diameter of the first end is the same as the diameter of the first straight hole section (151).
30. The valve assembly according to claim 24, characterized in that, the first tapered hole section (152) has a first end and a second end oppositely arranged, and the first end is connected to the first straight hole section ( 151) connection, the diameter of the first end is smaller than the diameter of the first straight hole section (151).
31. The valve assembly according to claim 24, characterized in that, the first connecting hole (15) further includes a second straight hole section (153), the first straight hole section (151), the second straight hole section The hole segment (153) communicates with the first tapered hole segment (152) in sequence, and the diameter of the second straight hole segment (153) is smaller than the diameter of the first straight hole segment (151), and the first straight hole segment (151) A tapered hole section (152) has a first end and a second end arranged oppositely, the first end is connected with the second straight hole section (153), and the diameter of the first end is the same as the second straight hole section (153). The hole segments (153) have the same diameter.
32. The valve assembly according to claim 24, characterized in that, the first connection hole (15) further includes a second tapered hole section (154), the first straight hole section (151), the second tapered hole section The hole section (154) communicates with the first tapered hole section (152) in sequence.
33. The valve assembly according to claim 1, characterized in that, the valve seat is provided with a first connecting port (17) and a second connecting port (18), and the first connecting port (17) and the lower The valve cavity (10b) is connected, and a first transition hole section (141) is also provided on the valve seat, and the first transition hole section (141) communicates with the valve port (14) in sequence, and the first transition hole section The segment (141) has a first end (1411) and a second end (1412) oppositely arranged, the first end (1411) communicates with the valve port (14), and the second end (1412) communicates with the valve port (1412). The second connection port (18) is connected, the first transition hole section (141) is a tapered structure, the aperture diameter of the first end (1411) is smaller than the aperture diameter of the second end (1412), and the first transition hole section (141) is a tapered structure. The taper angle of a transition hole section (141) is between 15° and 60°.
34. The valve assembly according to claim 33, characterized in that, the diameter of the first transition hole section (141) is greater than or equal to the diameter of the valve port (14).
35. The valve assembly according to claim 33, characterized in that, the hole diameter of the first end (1411) is between 2.5mm and 5mm.
36. The valve assembly according to claim 33, characterized in that, the axial length of the first transition hole segment (141) is between 0.8mm and 5mm.
37. The valve assembly according to claim 33, characterized in that, a second transition hole section (142) is also provided on the valve seat, and one end of the second transition hole section (142) is connected to the second end ( 1412), and the other end of the second transition hole segment (142) forms the second connection port (18).
38. The valve assembly according to claim 37, characterized in that, the diameters of the second transition hole sections (142) along the axial direction are the same.
39. The valve assembly according to claim 37, characterized in that, the aperture diameter of the second transition hole section (142) is equal to the aperture diameter of the second end (1412).
40. The valve assembly according to claim 37, characterized in that, the outer diameter of the second transition hole section (142) is smaller than the outer diameter of the first transition hole section (141).
41. The valve assembly according to claim 33, characterized in that, the axial length of the valve port (14) is between 0.5mm and 2mm.
42. The valve assembly according to claim 33, characterized in that chamfers are provided at the ports at both ends of the valve port (14).
43. The valve assembly according to claim 42, wherein the size of the chamfer is between C0.05mm and C0.15mm.
44. An electronic expansion valve, characterized in that the electronic expansion valve comprises the valve assembly according to any one of claims 1-43.

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