Electronic expansion valve

Abstract

The utility model relates to an electronic expansion valve which comprises a fixed seat assembly, a valve rod assembly, a valve rod assembly and a valve rod assembly. The valve element is movably arranged in the valve cavity, the outer circumferential wall of the valve element is in movable sealing fit with the inner circumferential wall of the valve cavity, the valve cavity is divided into an upper cavity body and a lower cavity body, the lower cavity body is used for communicating the inlet pipe with the valve port, the valve element is provided with an upper end face and a lower end face, the upper end face is arranged towards the upper cavity body, and the lower end face is arranged towards the valve port and used for blocking the valve port; the valve element is provided with a first channel penetrating through the lower end face and the upper end face. The transmission assembly is connected with the valve element and can drive the valve element to move up and down so that the lower end face can open or close the valve port. When the lower end face blocks the valve port, the valve port is communicated with the upper cavity through the first channel. The electronic expansion valve solves the problem that when the valve port is closed, the pressure difference between the upper end and the lower end of the valve element is large, and consequently the valve port is difficult to open.

Description

Technical Field

[0001] The present application relates to the technical field of electronic expansion valves, and in particular to an electronic expansion valve. Background Art

[0002] The electronic expansion valve is installed in the air conditioning system to cut off or connect the refrigerant passage. The electronic expansion valve usually includes a valve seat assembly, a valve core and a transmission assembly. The valve seat assembly has a valve cavity, one end of which has a valve port, the outlet pipe is connected to the valve port, and the inlet pipe is connected to the valve cavity at the side wall of the valve cavity. The transmission assembly drives the valve core to move up to open the valve port, so that the refrigerant in the inlet pipe can enter the outlet pipe from the valve port after entering the valve cavity; or, the transmission assembly drives the valve core to move down to close the valve port to cut off the refrigerant passage.

[0003] However, when the valve core is in the state of blocking the valve port, the pressure at the outlet pipe is lower than the pressure in the valve cavity, resulting in the pressure above the valve core being greater than the pressure below the valve core. In addition, the larger the valve port, the larger the force area of ​​the corresponding valve core, and the greater the pressure difference between the upper and lower ends of the valve core. In this way, the transmission component needs to provide a greater upward force on the valve core to overcome the pressure difference between the upper and lower ends of the valve core and drive the valve core to move upward to open the valve port. That is, when the valve port is closed, due to the large pressure difference between the upper and lower ends of the valve core, it is more difficult to open the valve core. Utility Model Content

[0004] Based on this, it is necessary to provide an electronic expansion valve to solve the problem that when the valve port is closed, it is difficult to open the valve port due to the large pressure difference between the upper and lower ends of the valve core.

[0005] An electronic expansion valve, the electronic expansion valve comprises: a fixed seat assembly, the fixed seat assembly has a valve cavity and a valve port; a valve core, movably arranged in the valve cavity, the outer peripheral wall of the valve core and the inner peripheral wall of the valve cavity movably seal and cooperate, and divide the valve cavity into an upper cavity and a lower cavity, the lower cavity is used to connect an inlet pipe and the valve port, the valve core has an upper end face and a lower end face, the upper end face is arranged toward the upper cavity, the lower end face is arranged toward the valve port, and the lower end face is used to block the valve port, and the valve core is provided with a first channel running through the lower end face and the upper end face; a transmission assembly, the transmission assembly is connected to the valve core and can drive the valve core to move up and down, so that the lower end face opens or closes the valve port; wherein, when the lower end face blocks the valve port, the valve port is connected to the upper cavity through the first channel.

[0006] In one embodiment, a mounting ring groove is formed in the first channel, a limiting protrusion is provided at the end of the transmission assembly, the limiting protrusion is installed in the mounting ring groove, the two ends of the limiting protrusion along its own axial direction are respectively abutted against two oppositely arranged side walls of the mounting ring groove, and a communication channel is formed between the outer peripheral wall of the limiting protrusion and the inner wall of the mounting ring groove, and the communication channel is connected to the first channel. It can be understood that such a configuration facilitates the transmission assembly to drive the valve core to move up and down, and enables the first channel to remain unobstructed.

[0007] In one embodiment, a notch is provided on the outer periphery of the limiting protrusion, and the notch penetrates both ends of the limiting protrusion along the axial direction of the limiting protrusion, and a communication channel is formed between the notch and the inner peripheral wall of the mounting ring groove. The notch and the upper edge and the lower edge of the mounting ring groove are staggered along the radial direction of the mounting ring groove, so that the communication channel is connected to the first channel. It can be understood that such a configuration facilitates the formation of the communication channel, and the communication channel is kept in communication with the first channel.

[0008] In one embodiment, there are multiple notches, and the multiple notches are spaced apart along the circumference of the limiting protrusion. It is understandable that such a configuration can increase the flow area of ​​the entire connecting channel, thereby facilitating the rapid flow of gas between the upper cavity and the lower cavity, thereby facilitating faster pressure balance between the upper cavity and the lower cavity.

[0009] In one embodiment, the electronic expansion valve further includes a pressing block and a limiting ring sleeve, the pressing block and the limiting ring sleeve are respectively connected to the inner wall of the first channel, and the pressing block and the limiting ring sleeve are arranged at intervals along the axis of the first channel, so that an installation ring groove is formed between the limiting ring sleeve, the inner wall of the first channel and the pressing block. It can be understood that such an arrangement can facilitate the assembly between the transmission component and the valve core.

[0010] In one embodiment, the pressing block is arranged close to the upper end surface, and a flow gap is formed between the inner peripheral wall of the pressing block and the outer peripheral wall of the transmission assembly, and the lower end surface is connected to the upper end surface through the first channel, the connecting channel and the flow gap. It can be understood that such an arrangement can avoid blocking the first channel due to the installation of the pressing block.

[0011] In one of the embodiments, the electronic expansion valve also includes an outer shell, which is covered on a side of the fixed seat assembly away from the valve port and forms a rotor cavity between the outer shell and the fixed seat assembly. A through hole is provided on the side wall of the fixed seat assembly, and the through hole connects the upper cavity and the rotor cavity. It can be understood that such a configuration balances the pressure at the upper and lower ends of the nut, so that the nut will not be affected by the pressure difference between the upper and lower ends when it moves up and down, which makes it convenient for the screw to drive the nut to move up and down.

[0012] In one embodiment, the fixed seat assembly includes a connecting sleeve and a guide sleeve that are fixedly connected, the connecting sleeve is used to install the transmission assembly, the valve cavity is opened in the guide sleeve, and the through hole is opened in the guide sleeve. It can be understood that such an arrangement can reduce the difficulty of processing the fixed seat assembly.

[0013] In one embodiment, the guide sleeve is sleeved on the outer periphery of the connecting sleeve and welded to the connecting sleeve. It is understandable that such arrangement can enhance the firmness of the connection between the guide sleeve and the connecting sleeve.

[0014] In one embodiment, the connecting sleeve includes a welding section and a matching section, the welding section is attached to the guide sleeve for welding the guide sleeve, the matching section is spaced apart from the guide sleeve, and a second channel is formed between the matching section and the guide sleeve, the second channel connects the upper cavity and the through hole. It can be understood that, in such a configuration, the second channel can not only connect the upper cavity and the through hole, but also accommodate excess solder between the welding section and the guide sleeve, thereby preventing the solder from flowing into the upper cavity.

[0015] In one embodiment, there are multiple through holes, and the multiple through holes are arranged at intervals along the circumference of the fixing seat assembly.

[0016] Compared with the prior art, the electronic expansion valve provided in the present application, when the lower end face is sealed at the valve port, the pressure at the outlet pipe is lower than the pressure in the valve cavity, and by providing the first channel, the outlet pipe is connected to the upper cavity, so that the pressure applied to the lower end face is consistent with the pressure applied to the upper end face, thereby facilitating the transmission assembly to drive the valve core to move upward to open the valve port.

[0017] Furthermore, since the outer circumferential wall of the valve core and the inner circumferential wall of the valve cavity are sealed together to separate the valve cavity into an upper cavity and a lower cavity, when the valve port is closed, the refrigerant in the lower cavity cannot enter the upper cavity, and further cannot flow into the outlet pipe through the opening on the upper end surface via the first channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A cross-sectional view of an electronic expansion valve according to an embodiment of the present application;

[0020] Figure 2 for Figure 1 An enlarged schematic diagram at A;

[0021] Figure 3A schematic diagram of the structure of a nut according to an embodiment of the present application;

[0022] Figure 4 A schematic structural diagram of a connecting sleeve according to an embodiment of the present application.

[0023] 1. Valve opening; 2. Valve port; 3. Through hole; 4. Connecting sleeve; 5. Welding section; 6. Fitting section; 7. Guide sleeve; 8. Transmission assembly; 9. Limiting bump; 10. Notch; 11. Screw; 12. Nut; 13. Valve core; 14. First passage; 15. Mounting groove; 16. Stop step; 17. First section; 18. Second section; 19. Press block; 20. Connecting passage; 21. Limiting sleeve; 22. Second passage; 23. Upper end face; 24. Lower end face; 25. Circulation gap; 26. Inlet pipe; 27. Outlet pipe; 28. Outer casing; 29. ​​Rotor chamber. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0025] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0029] See also Figure 1-Figure 3 The present application provides an electronic expansion valve, which includes: a fixed seat assembly 10, the fixed seat assembly 10 has a valve cavity 11 and a valve port 12, the valve port 12 is used to connect the outlet pipe 50; a valve core 30, which is movably arranged in the valve cavity 11, the outer peripheral wall of the valve core 30 is movably sealed with the inner peripheral wall of the valve cavity 11, and the valve cavity 11 is divided into an upper cavity 111 and a lower cavity 112, the lower cavity 112 is used to connect the inlet pipe 40 and the valve port 12, and the valve core 30 has an upper end surface 36 and a lower end surface 37 The upper end surface 36 is arranged toward the upper cavity 111, and the lower end surface 37 is arranged toward the valve port 12, and the lower end surface 37 is used to block the valve port 12, and the valve core 30 is provided with a first channel 31 that runs through the lower end surface 37 and the upper end surface 36; the transmission assembly 20, the transmission assembly 20 is connected to the valve core 30 and can drive the valve core 30 to move up and down so that the lower end surface 37 opens or closes the valve port 12; wherein, when the lower end surface 37 blocks the valve port 12, the valve port 12 is connected to the upper cavity 111 through the first channel 31.

[0030] The working process of the electronic expansion valve is as follows: when the lower end surface 37 opens the valve port 12, the refrigerant can enter the lower cavity 112 from the inlet pipe 40, and then flow out of the lower cavity 112 through the valve port 12 and the outlet pipe 50; when the lower end surface 37 blocks the valve port 12, the refrigerant flow path is cut off and cannot enter the outlet pipe 50.

[0031] When the lower end face 37 is blocked at the valve port 12, the pressure at the outlet pipe 50 is lower than the pressure in the valve cavity 11. By setting the first channel 31, the outlet pipe 50 is connected to the upper cavity 111, so that the pressure applied to the lower end face 37 is consistent with the pressure applied to the upper end face 36, thereby facilitating the transmission assembly 20 to drive the valve core 30 to move upward to open the valve port 12.

[0032] Furthermore, since the outer circumferential wall of the valve core 30 seals with the inner circumferential wall of the valve cavity 11 to separate the valve cavity 11 into an upper cavity 111 and a lower cavity 112, when the valve port 12 is closed, the refrigerant in the lower cavity 112 cannot enter the upper cavity 111, and further cannot flow into the outlet pipe 50 through the opening on the upper end surface 36 via the first channel 31.

[0033] In one embodiment, a mounting annular groove 311 is formed in the first channel 31, and a limiting protrusion 21 is provided at the end of the transmission assembly 20. The limiting protrusion 21 is installed in the mounting annular groove 311. The two ends of the limiting protrusion 21 along its own axial direction respectively abut against two oppositely arranged side walls of the mounting annular groove 311, and a connecting channel 33 is formed between the outer peripheral wall of the limiting protrusion 21 and the inner wall of the mounting annular groove 311.

[0034] In this way, the limiting protrusion 21 can drive the valve core 30 to move toward the direction close to the valve port 12 or drive the valve core 30 to move toward the direction away from the valve port 12 by abutting and cooperating with the two oppositely arranged side walls of the mounting annular groove 311. Furthermore, by forming a connecting passage 33 between the outer peripheral wall of the limiting protrusion 21 and the inner wall of the mounting annular groove 311, it is possible to avoid blocking the first passage 31 due to the existence of the limiting protrusion 21, that is, it is possible to ensure that the first passage 31 remains in a connected state.

[0035] The transmission assembly 20 includes a rotor assembly, a screw 23 and a nut 24. The screw 23 is limited to the fixed seat assembly 10 along its own axial direction. The rotor assembly is used to drive the screw 23 to rotate around its own axial direction. The nut 24 is sleeved on the outer periphery of the screw 23 and is threadedly matched with the screw 23. The outer wall of the nut 24 is limited to the fixed seat assembly 10 along its own circumference. The limiting protrusion 21 is provided at the end of the nut 24 close to the valve core 30. In this way, the rotation of the screw 23 is converted into the axial movement of the nut 24, and the valve core 30 is driven to move through the limiting protrusion 21.

[0036] In one embodiment, if Figure 1 and Figure 3As shown, a notch 211 is provided on the outer periphery of the limiting protrusion 21, and the notch 211 passes through both ends of the limiting protrusion 21 along the axis of the limiting protrusion 21, and a communication channel 33 is formed between the notch 211 and the inner peripheral wall of the mounting annular groove 311. The upper edge and the lower edge of the notch 211 and the mounting annular groove 311 are staggered along the radial direction of the mounting annular groove 311, so that the communication channel 33 is connected to the first channel 31.

[0037] By arranging the inner wall of the notch 211 and the upper and lower edges of the mounting groove 311 to be staggered along the radial direction of the mounting groove 311 , both ends of the notch 211 can be connected to the first channel 31 respectively, so that the first channel 31 will not be blocked due to the existence of the limiting protrusion 21 .

[0038] Specifically, the notch portion 211 is configured as a through groove extending along the axial direction of the limiting protrusion 21 , so that the shape of the notch portion 211 is simple and the processing difficulty is relatively low.

[0039] There are multiple notch portions 211 , and the multiple notch portions 211 are distributed at intervals along the circumference of the limiting protrusion 21 .

[0040] In this way, a plurality of spaced connecting channels 33 can be formed, that is, the overall flow area of ​​the connecting channels 33 can be increased, thereby facilitating rapid flow of gas between the lower cavity 112 and the upper cavity 111, thereby facilitating faster achievement of pressure balance between the lower cavity 112 and the upper cavity 111.

[0041] Furthermore, the plurality of notches 211 may be evenly spaced and distributed along the circumference of the limiting protrusion 21 .

[0042] In one embodiment, if Figure 1 As shown, the electronic expansion valve also includes a pressure block 32 and a limiting ring sleeve 34, which are respectively connected to the inner wall of the first channel 31, and the pressure block 32 and the limiting ring sleeve 34 are spaced apart along the axis of the first channel 31, so that a mounting ring groove 311 is formed between the limiting ring sleeve 34, the inner wall of the first channel 31 and the pressure block 32.

[0043] Since the limiting protrusion 21 drives the valve core 30 to move toward the valve port 12 by abutting against the two side walls of the mounting annular groove 311, that is, the limiting protrusion 21 is clamped along its own axial direction between the upper avoidance surface and the lower wall surface of the mounting annular groove 311. In this embodiment, a separate pressing block 32 and a limiting ring sleeve 34 are provided, and the mounting annular groove 311 is formed between the limiting ring sleeve 34, the inner wall of the first channel 31 and the pressing block 32. It can facilitate the assembly between the transmission component 20 and the valve core 30. Specifically, during the actual assembly, the limiting ring sleeve 34 can be connected to the first channel 31 first, and then the limiting protrusion 21 can be extended into the first channel 31, and finally the pressing block 32 can be connected to the first channel 31.

[0044] Furthermore, the pressing block 32 is ring-shaped, and the pressing block 32 is welded to the inner wall of the first channel 31 .

[0045] Furthermore, the first channel 31 includes a first section 313 and a second section 314 that are connected to each other. The second section 314 is arranged close to the valve port 12. The pressure block 32 is connected to the first section 313. The aperture of the first section 313 is larger than the aperture of the second section 314, so that a stop step 312 is formed at the end of the second section 314 close to the first section 313, and the limiting ring sleeve 34 can abut against the stop step 312.

[0046] By providing the stop step 312, the limiting ring sleeve 34 can be stopped at the stop step 312, and the limiting ring sleeve 34 does not need to be welded to the first channel 31, which is conducive to simplifying the assembly procedure of the electronic expansion valve. Of course, in this embodiment, the limiting ring sleeve 34 may not be provided, but the stop step 312, the inner wall of the first channel 31 and the pressing block 32 are surrounded to form a mounting ring groove 311.

[0047] Furthermore, the electronic expansion valve also includes a spring, one end of which is connected to the limit ring sleeve 34, and the other end is connected to the valve core 30. The spring provides an upward elastic force for the limit ring sleeve 34, so that the limit ring sleeve 34 maintains contact with the limit protrusion 21 under the support of the spring.

[0048] Furthermore, the pressing block 32 is arranged close to the upper end surface 36 , and a flow gap 38 is formed between the inner circumferential wall of the pressing block 32 and the outer circumferential wall of the transmission assembly 20 , and the lower end surface 37 is connected to the upper end surface 36 through the first channel 31 , the connecting channel 33 and the flow gap 38 .

[0049] By providing the flow gap 38 , it is possible to avoid blocking the first channel 31 due to the existence of the pressure block 32 . That is, by providing the flow gap 38 , the upper end surface 36 and the lower end surface 37 can remain conductive.

[0050] In one embodiment, the electronic expansion valve also includes an outer shell 60, which is covered on a side of the fixed seat assembly 10 away from the valve port 12, and a rotor cavity 70 is formed between the outer shell 60 and the fixed seat assembly 10. A through hole 13 is opened on the side wall of the fixed seat assembly 10, and the through hole 13 connects the upper cavity 111 and the rotor cavity 70.

[0051] The rotor cavity 70 is used to accommodate the rotor assembly. Since the lower end of the nut 24 extends into the first channel 31, the upper end is located in the connecting sleeve 14 and is threadedly connected to the screw 23, the rotor cavity 70 is connected to the connecting sleeve 14, and the through hole 13 is provided to connect the upper cavity 111 and the rotor cavity 70, so that the pressure on the upper end face and the lower end face of the nut 24 is balanced, so that when the nut 24 moves up and down, it will not be affected by the pressure difference between the upper and lower ends of the nut 24, that is, it is convenient for the screw 23 to drive the nut 24 to move up and down.

[0052] In one embodiment, the fixing seat assembly 10 includes a connecting sleeve 14 and a guide sleeve 15 that are fixedly connected. The connecting sleeve 14 is used to install the transmission assembly 20 . The valve cavity is opened in the guide sleeve 15 , and the through hole 13 is opened in the guide sleeve 15 .

[0053] In this way, the connecting sleeve 14 and the guiding sleeve 15 can be processed separately, and then the connecting sleeve 14 and the guiding sleeve 15 are welded, which can reduce the processing difficulty compared to setting the fixing seat assembly 10 as an integrally formed part.

[0054] Specifically, the guide sleeve 15 is sleeved on the outer circumference of the connecting sleeve 14 and welded to the connecting sleeve 14 .

[0055] In this way, the firmness of the connection between the guide sleeve 15 and the connecting sleeve 14 can be enhanced. And the welding method between the guide sleeve 15 and the connecting sleeve 14 is furnace welding.

[0056] In one embodiment, if Figure 2 As shown, the connecting sleeve 14 includes a welding section 141 and a matching section 142. The welding section 141 is attached to the guide sleeve 15 for welding the guide sleeve 15. The matching section 142 is spaced apart from the guide sleeve 15 and forms a second channel 35 with the guide sleeve 15. The second channel 35 connects the upper cavity 111 and the through hole 13.

[0057] In addition to being able to connect the upper cavity 111 and the through hole 13 , the second channel 35 can also accommodate excess solder between the welding section 141 and the guide sleeve 15 , thereby preventing the solder from flowing into the upper cavity 111 .

[0058] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An electronic expansion valve, It is characterized in that The electronic expansion valve comprises: A fixed seat assembly (10), wherein the fixed seat assembly (10) comprises a valve cavity (11) and a valve port (12); a valve core (30) movably disposed in the valve cavity (11); an outer peripheral wall of the valve core (30) movably seals with an inner peripheral wall of the valve cavity (11) and divides the valve cavity (11) into an upper cavity (111) and a lower cavity (112); the lower cavity (112) is used to connect the inlet pipe (40) and the valve port (12); the valve core (30) has an upper end surface (36) and a lower end surface (37); the upper end surface (36) is disposed toward the upper cavity (111); the lower end surface (37) is disposed toward the valve port (12); and the lower end surface (37) is used to block the valve port (12); the valve core (30) is provided with a first channel (31) penetrating the lower end surface (37) and the upper end surface (36); a transmission assembly (20), the transmission assembly (20) being connected to the valve core (30) and capable of driving the valve core (30) to move up and down, so that the lower end surface (37) opens or closes the valve port (12); Wherein, when the lower end surface (37) is blocked at the valve port (12), the valve port (12) is connected to the upper cavity (111) through the first channel (31).

2. The electronic expansion valve according to claim 1, It is characterized in that A mounting annular groove (311) is formed in the first channel (31), and a limiting protrusion (21) is provided at the end of the transmission assembly (20). The limiting protrusion (21) is installed in the mounting annular groove (311). The two ends of the limiting protrusion (21) along its own axial direction are respectively abutted against two oppositely arranged side walls of the mounting annular groove (311), and a connecting channel (33) is formed between the outer peripheral wall of the limiting protrusion (21) and the inner wall of the mounting annular groove (311), and the connecting channel (33) is connected with the first channel (31).

3. The electronic expansion valve according to claim 2, It is characterized in that A notch portion (211) is provided on the outer periphery of the limiting protrusion (21), the notch portion (211) penetrates through both ends of the limiting protrusion (21) along the axial direction of the limiting protrusion (21), and the communicating channel (33) is formed between the notch portion (211) and the inner peripheral wall of the mounting ring groove (311); The notch portion (211) and the upper edge and the lower edge of the mounting ring groove (311) are staggered along the radial direction of the mounting ring groove (311) so that the connecting channel (33) is connected to the first channel (31).

4. The electronic expansion valve according to claim 3, It is characterized in that The number of the notch portions (211) is plural, and the plurality of notch portions (211) are distributed at intervals along the circumference of the limiting protrusion (21).

5. The electronic expansion valve according to claim 3, It is characterized in that The electronic expansion valve further comprises a pressing block (32) and a limiting ring sleeve (34), wherein the pressing block (32) and the limiting ring sleeve (34) are respectively connected to the inner wall of the first channel (31), and the pressing block (32) and the limiting ring sleeve (34) are arranged at intervals along the axis of the first channel (31), so that the mounting ring groove (311) is formed between the limiting ring sleeve (34), the inner wall of the first channel (31) and the pressing block (32).

6. The electronic expansion valve according to claim 5, It is characterized in that The pressing block (32) is arranged close to the upper end surface (36), and a flow gap (38) is formed between the inner peripheral wall of the pressing block (32) and the outer peripheral wall of the transmission assembly (20), and the lower end surface (37) is connected to the upper end surface (36) through the first channel (31), the connecting channel (33) and the flow gap (38).

7. The electronic expansion valve according to claim 1, It is characterized in that The electronic expansion valve further comprises an outer shell (60), the outer shell (60) being arranged on a side of the fixed seat assembly (10) away from the valve port (12), and forming a rotor cavity (70) between the outer shell (60) and the fixed seat assembly (10), a through hole (13) being provided on a side wall of the fixed seat assembly (10), and the through hole (13) being connected between the upper cavity (111) and the rotor cavity (70).

8. The electronic expansion valve according to claim 7, It is characterized in that The fixed seat assembly (10) comprises a connecting sleeve (14) and a guide sleeve (15) which are fixedly connected, the connecting sleeve (14) being used for installing the transmission assembly (20), and the valve cavity (11) and the through hole (13) being respectively opened in the guide sleeve (15).

9. The electronic expansion valve according to claim 8, It is characterized in that The guide sleeve (15) is sleeved on the outer circumference of the connecting sleeve (14) and is welded to the connecting sleeve (14).

10. The electronic expansion valve according to claim 9, It is characterized in that The connecting sleeve (14) comprises a welding section (141) and a matching section (142); the welding section (141) is attached to the guide sleeve (15) for welding the guide sleeve (15); The matching section (142) is spaced apart from the guide sleeve (15) and forms a second channel (35) with the guide sleeve (15). The second channel (35) communicates with the upper cavity (111) and the through hole (13).

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