Electronic expansion valve

Abstract

Provided in the present application is an electronic expansion valve, comprising a valve tube, a valve seat portion, a nut structure, a valve needle structure and a hollow noise reduction column, wherein the valve seat portion is connected to one end of the valve tube, and the valve seat portion is provided with a valve port; at least part of the nut structure is located in the valve tube, and the nut structure is fixedly connected to the valve seat portion; the valve needle structure movably passes through the nut structure to open and close the electronic expansion valve and regulate the degree of opening of the valve port; one end of the noise reduction column is in limiting fit with the valve seat portion, the other end of the noise reduction column is in limiting fit with the nut structure, and the noise reduction column is arranged around the valve port and the valve needle structure. The nut structure is provided with a communicating channel; the communicating channel communicates cavities inside and outside the noise reduction column to discharge impurities in fluid that remain in the noise reduction column. When the fluid flows through the noise reduction column, the noise reduction column breaks down air bubbles in the fluid for noise reduction. The communicating channel enables impurities inside the noise reduction column to be discharged out of the noise reduction column. The present solution solves the problem of the generation of noise during use of the electronic expansion valve, and avoids impurity blockage.

Description

Electronic expansion valve

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on March 4, 2024, with application number 2024102465990 and title “Electronic Expansion Valve.” Technical Field

[0002] The present application relates to the technical field of electronic expansion valves, and in particular to an electronic expansion valve. Background Art

[0003] Electronic expansion valves lack noise reduction components before and after the valve port, preventing them from filtering out bubbles. When the refrigerant before the valve is in a two-phase state, the uneven distribution of bubbles within the refrigerant creates discontinuous noise as it passes through the valve. Therefore, a new electronic expansion valve is needed that can address the noise issue during use.

[0004] Application Contents

[0005] The present application provides an electronic expansion valve to solve the problem of noise generated during use of the electronic expansion valve in the prior art.

[0006] In order to solve the above problems, the present application provides an electronic expansion valve, comprising: a valve tube; a valve seat portion, connected to one end of the valve tube, the valve seat portion having a valve port; a nut structure, at least a portion of the nut structure is located in the valve tube, the nut structure and the valve seat portion are fixedly connected; a valve needle structure, the valve needle structure can be movably passed through the nut structure to open and close the valve port and adjust the opening; a hollow noise reduction column, one end of the noise reduction column is limitedly matched with the valve seat portion, and the other end of the noise reduction column is limitedly matched with the nut structure, and the noise reduction column is arranged around the valve port and the valve needle structure; wherein the nut structure has a connecting channel, the connecting channel connects the inner and outer cavities of the noise reduction column to discharge impurities remaining in the noise reduction column in the fluid.

[0007] Furthermore, the noise reduction column includes multiple layers of tubular sintered mesh, which are stacked and arranged, and the total flow area of ​​each layer of sintered mesh is larger than the flow area of ​​the valve port.

[0008] Furthermore, the connecting channel includes a first channel and a second channel, and there is a rotor cavity between the nut structure and the valve tube. The first channel connects the cavity inside the noise reduction column with the rotor cavity, and the second channel connects the rotor cavity with the cavity outside the noise reduction column.

[0009] Furthermore, the nut structure includes a nut seat and a nut column. The nut column is set through the nut seat. The nut column is fixedly connected to the nut seat. The end of the nut column close to the valve port is inserted into the noise reduction column.

[0010] Furthermore, the connecting channel includes a first channel located between the nut column and the nut seat, and there is a rotor cavity between the nut structure and the valve tube. The first channel connects the cavity inside the noise reduction column with the rotor cavity, and the rotor cavity is connected with the cavity outside the noise reduction column.

[0011] Furthermore, the side surface of the nut column has at least one first cut surface, and a first channel is formed between the first cut surface and the nut seat.

[0012] Furthermore, the communicating channel includes a second channel located between the nut structure and the valve seat portion, and there is a rotor cavity between the nut structure and the valve tube. The second channel connects the rotor cavity with the cavity outside the noise reduction column, and the rotor cavity is connected with the cavity inside the noise reduction column.

[0013] Furthermore, the nut structure includes a nut seat and a nut column, and the side surface of the nut seat has at least one second section, and a second channel is formed between the second section and the valve seat portion.

[0014] Furthermore, the valve seat portion has a limiting step, which is limited by the nut structure. The electronic expansion valve also includes a nut connecting plate. The nut structure includes a nut seat and a nut column. The nut connecting plate is arranged at the end of the nut seat away from the valve port. The nut connecting plate is fixedly connected to the valve seat portion. The nut connecting plate is limited by the nut seat, and the nut connecting plate is provided with an avoidance channel to avoid the connecting channel.

[0015] Furthermore, one end of the noise reduction column abuts against the valve seat portion, and the other end of the noise reduction column abuts against one end of the nut structure facing the valve port; or, one end of the noise reduction column is welded and fixed to the valve seat portion, and the other end of the noise reduction column abuts against or has a clearance fit with the end face of the nut structure facing the valve port.

[0016] Furthermore, the valve seat portion is an integrated structure; or, the valve seat portion includes a valve seat and a valve core seat, the valve seat is fixedly connected to the valve pipe, the valve core seat and the valve seat are fixedly connected, the valve core seat has a valve port, and the valve core seat and the noise reduction column are limited.

[0017] By applying the technical solution of the present application, an electronic expansion valve is provided, comprising a valve tube, a valve seat, a nut structure, a valve needle structure, and a hollow noise reduction column. The valve seat is connected to one end of the valve tube, and the valve seat has a valve port. At least a portion of the nut structure is located within the valve tube, and the nut structure and the valve seat are fixedly connected. The valve needle structure can movably pass through the nut structure to open and close the valve port and adjust the opening. One end of the noise reduction column is limited by the valve seat, and the other end of the noise reduction column is limited by the nut structure. The noise reduction column is arranged around the valve port and the valve needle structure. The nut structure has a connecting channel, which connects the inner and outer cavities of the noise reduction column to discharge impurities remaining in the noise reduction column in the fluid. By adopting this solution, the fluid enters the valve seat and the valve tube through the valve port, the nut structure is fixedly connected to the valve seat, and the valve needle structure moves up and down relative to the nut structure to adjust the opening and closing and the opening of the valve port. The valve seat and nut structure respectively limit the two ends of the noise reduction column. The noise reduction column is arranged around the valve port and the valve needle structure, so that the fluid entering the valve port flows into the noise reduction column. The pores in the noise reduction column filter the bubbles in the fluid and then output the fluid, thereby reducing noise. Some impurities in the fluid may not be able to pass through the pores of the noise reduction column. The nut structure has a connecting channel, which connects the inner and outer cavities of the noise reduction column. Therefore, the impurities remaining in the internal cavity of the noise reduction column after the fluid is filtered can be discharged to the cavity outside the noise reduction column, avoiding impurities clogging the internal cavity of the noise reduction column. By filtering the bubbles in the fluid with the noise reduction column and discharging impurities through the connecting channel, this solution solves the problem of noise generated during the use of the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0019] FIG1 shows a schematic structural diagram of an electronic expansion valve provided in an embodiment of the present application;

[0020] FIG. 2 shows a schematic structural diagram of a nut structure of the electronic expansion valve in FIG. 1 .

[0021] Among them, the above-mentioned drawings include the following figure marks: 10, valve tube; 20, valve seat portion; 21, valve seat; 211, limiting step; 22, valve core seat; 30, nut structure; 31, nut seat; 311, second section; 32, nut column; 321, first section; 40, valve needle structure; 50, noise reduction column; 60, connecting channel; 61, first channel; 62, second channel; 70, nut connecting plate. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0023] As shown in Figures 1 to 2, an embodiment of the present application provides an electronic expansion valve, including a valve tube 10, a valve seat portion 20, a nut structure 30, a valve needle structure 40 and a hollow noise reduction column 50. The valve seat portion 20 is connected to one end of the valve tube 10, and the valve seat portion 20 has a valve port; at least a portion of the nut structure 30 is located in the valve tube 10, and the nut structure 30 and the valve seat portion 20 are fixedly connected; the valve needle structure 40 can be movably passed through the nut structure 30 to open and close the valve port and adjust the opening; one end of the noise reduction column 50 is limitedly matched with the valve seat portion 20, and the other end of the noise reduction column 50 is limitedly matched with the nut structure 30, and the noise reduction column 50 is arranged around the valve port and the valve needle structure 40; wherein the nut structure 30 has a connecting channel 60, which connects the inner and outer cavities of the noise reduction column 50 to discharge impurities remaining in the noise reduction column 50 in the fluid.

[0024] With this solution, fluid enters the valve seat 20 and valve tube 10 through the valve port. The nut structure 30 is fixedly connected to the valve seat 20, and the valve needle structure 40 moves up and down relative to the nut structure 30 to adjust the opening and closing of the valve port. The valve seat 20 and the nut structure 30 respectively limit the ends of the noise reduction column 50. The noise reduction column 50 is arranged around the valve port and the valve needle structure 40, so that the fluid entering the valve port flows into the noise reduction column 50. The pores in the noise reduction column 50 refine the bubbles in the fluid and output the fluid, thereby reducing noise. Some impurities in the fluid may not be able to pass through the pores of the noise reduction column. The nut structure 30 has a connecting channel 60, which connects the inner and outer cavities of the noise reduction column 50. This connecting channel 60 can filter impurities remaining in the internal cavity of the noise reduction column 50 and discharge them to the cavity outside the noise reduction column 50, preventing impurities from clogging the internal cavity of the noise reduction column 50. By filtering the fluid through the noise reduction column 50 to refine the bubbles in the fluid and discharging impurities through the connecting channel 60, this solution solves the problem of noise generation during the use of the electronic expansion valve and the problem of easy clogging by impurities.

[0025] The fluid in the electronic expansion valve flows in both directions, and the noise can be reduced by refining bubbles through the noise reduction column 50 in both forward and reverse directions. When flowing in the forward direction, impurities generally adhere to the outside of the noise reduction column 50. When flowing in the reverse direction (when the valve port is the inlet), the noise reduction column 50 is prone to clogging with impurities. The setting of the above-mentioned connecting channel 60 avoids the problem of impurity clogging.

[0026] Furthermore, the noise reduction column 50 comprises multiple layers of tubular sintered mesh, which are stacked and arranged such that the total flow area of ​​each layer is larger than the flow area of ​​the valve port. The multiple layers of sintered mesh are first sintered separately and then die-cast into the noise reduction column 50.

[0027] In this arrangement, multiple layers of tubular sintered mesh are stacked to form a hollow noise reduction column 50. The sintered mesh filters the fluid, layer by layer, reducing bubbles and eliminating noise. The total flow area of ​​each layer of sintered mesh is larger than the flow area of ​​the valve port, preventing the noise reduction column 50 from throttling the fluid entering the valve port.

[0028] In a specific embodiment of the present application, the sintered mesh is 6-7 layers, and the specification of each layer of sintered mesh is about 75 mesh.

[0029] As shown in Figure 1, the connecting channel 60 includes a first channel 61 and a second channel 62. There is a rotor cavity between the nut structure 30 and the valve tube 10. The first channel 61 connects the cavity inside the noise reduction column 50 with the rotor cavity, and the second channel 62 connects the rotor cavity with the cavity outside the noise reduction column 50.

[0030] In this arrangement, the first channel 61 connects the cavity inside the noise reduction column 50 with the rotor cavity, so that impurities in the cavity inside the noise reduction column 50 are transported to the rotor cavity through the first channel 61, and the impurities in the rotor cavity are transported to the cavity outside the noise reduction column 50 through the second channel 62.

[0031] As shown in FIG1 , the nut structure 30 includes a nut seat 31 and a nut column 32 . The nut column 32 is set through the nut seat 31 . The nut column 32 is fixedly connected to the nut seat 31 . The end of the nut column 32 close to the valve port is inserted into the noise reduction column 50 .

[0032] With such arrangement, the nut column 32 is fixedly connected to the nut seat 31 , and one end of the nut column 32 close to the valve port is inserted into the noise reduction column 50 , so as to facilitate positioning of the noise reduction column 50 .

[0033] As shown in Figure 1, the connecting channel 60 includes a first channel 61 located between the nut column 32 and the nut seat 31. There is a rotor cavity between the nut structure 30 and the valve tube 10. The first channel 61 connects the cavity inside the noise reduction column 50 with the rotor cavity, and the rotor cavity is connected to the cavity outside the noise reduction column 50.

[0034] With this arrangement, a first channel 61 is defined between the nut column 32 and the nut seat 31. The first channel 61 connects the rotor cavity with the cavity within the noise reduction column 50, thereby transporting impurities remaining in the cavity within the noise reduction column 50 to the rotor cavity through the first channel 61. The rotor cavity is connected to the cavity outside the noise reduction column 50, thereby transporting impurities from the cavity within the noise reduction column 50 to the cavity outside the noise reduction column 50, preventing impurities from clogging the cavity within the noise reduction column 50.

[0035] As shown in FIG. 2 , in a specific embodiment of the present application, the side surface of the nut column 32 has at least one first cut surface 321 , and a first channel 61 is formed between the first cut surface 321 and the nut seat 31 .

[0036] In this configuration, a space is provided between the first cut surface 321 and the nut seat 31, thereby forming a first channel 61, so that impurities can be transported to the rotor cavity through the first channel 61. The processing of the first cut surface 321 is relatively simple, saving costs.

[0037] Optionally, in a specific embodiment of the present application, a hole may be punched in the nut seat 31 to form a first channel 61 to connect the cavity in the noise reduction column 50 with the rotor cavity.

[0038] As shown in Figure 1, the connecting channel 60 includes a second channel 62 located between the nut structure 30 and the valve seat portion 20. There is a rotor cavity between the nut structure 30 and the valve tube 10. The second channel 62 connects the rotor cavity with the cavity outside the noise reduction column 50, and the rotor cavity and the cavity inside the noise reduction column 50 are connected.

[0039] With this arrangement, a second passage 62 is formed between the nut structure 30 and the valve seat portion 20, allowing the rotor cavity to communicate with the cavity outside the noise reduction column 50. The rotor cavity and the cavity inside the noise reduction column 50 are connected, allowing impurities in the cavity inside the noise reduction column 50 to enter the rotor cavity. The second passage 62 transports the impurities in the rotor cavity to the cavity outside the noise reduction column 50, thereby transporting impurities from the cavity inside the noise reduction column 50 to the cavity outside the noise reduction column 50, thereby avoiding clogging of the noise reduction column 50.

[0040] As shown in FIG. 2 , in a specific embodiment of the present application, the nut structure 30 includes a nut seat 31 and a nut column 32 . The side surface of the nut seat 31 has at least one second section 311 , and a second channel 62 is formed between the second section 311 and the valve seat portion 20 .

[0041] With this arrangement, a space is created between the second cut surface 311 and the sidewall of the valve seat portion 20, forming a second channel 62. This allows impurities in the rotor cavity to be transported through the second channel 62 to the cavity outside the noise reduction column 50. The processing of the second cut surface 311 is relatively simple, saving costs.

[0042] Optionally, in a specific embodiment of the present application, a second channel 62 may be formed by punching a hole on the nut seat 31 to connect the rotor cavity with the cavity outside the noise reduction column 50 .

[0043] As shown in Figure 1, the valve seat portion 20 has a limiting step 211, which is limited by the nut structure 30. The electronic expansion valve also includes a nut connecting plate 70. The nut structure 30 includes a nut seat 31 and a nut column 32. The nut connecting plate 70 is arranged at an end of the nut seat 31 away from the valve port. The nut connecting plate 70 is fixedly connected to the valve seat portion 20. The nut connecting plate 70 is limited by the nut seat 31. The nut connecting plate 70 is provided with an avoidance channel to avoid the connecting channel 60.

[0044] With this arrangement, the limiting step 211 cooperates with the nut structure 30 to limit the axial direction of the nut structure 30. The nut connecting plate 70 is disposed at the end of the nut seat 31 away from the valve port and cooperates with the nut seat 31 to limit the position. The nut connecting plate 70 is provided with an avoidance passage that avoids the communication passage 60, preventing the nut connecting plate 70 from blocking the first passage 61 or the second passage 62.

[0045] As shown in Figure 1, one end of the noise reduction column 50 abuts against the valve seat portion 20, and the other end of the noise reduction column 50 abuts against one end of the nut structure 30 facing the valve port; or, one end of the noise reduction column 50 is welded and fixed to the valve seat portion 20, and the other end of the noise reduction column 50 abuts against or has a clearance fit with the end face of the nut structure 30 facing the valve port.

[0046] When one end of the noise reduction column 50 abuts against the valve seat portion 20 and the other end of the noise reduction column 50 abuts against the end of the nut structure 30 facing the valve port, the length of the noise reduction column 50 is greater than or equal to the distance between the valve seat portion 20 and the end of the nut structure 30 facing the valve port. Specifically, the end of the noise reduction column 50 away from the valve port abuts against the end face of the nut seat 31 facing the valve port, and the length of the noise reduction column is greater than or equal to the distance between the valve seat portion 20 and the end face of the nut seat 31 facing the valve port, so that the valve seat portion 20 and the nut structure 30 limit the noise reduction column 50.

[0047] When one end of the noise reduction column 50 is welded and fixed to the valve seat portion 20, the other end of the noise reduction column 50 is in abutment with or clearance fit against the end face of the nut structure 30 facing the valve port, that is, the length of the noise reduction column 50 can also be equal to or slightly smaller than the distance between the valve seat portion 20 and the end face of the nut structure 30 facing the valve port. Specifically, the end face of the noise reduction column 50 away from the valve port is in abutment with or clearance fit against the end face of the nut seat 31 facing the valve port, that is, the length of the noise reduction column 50 can be slightly smaller than the distance between the valve seat portion 20 and the end face of the nut seat 31 facing the valve port, thereby limiting the noise reduction column 50.

[0048] Furthermore, the valve seat portion 20 is an integrated structure; or, the valve seat portion 20 includes a valve seat 21 and a valve core seat 22, the valve seat 21 is fixedly connected to the valve tube 10, the valve core seat 22 and the valve seat 21 are fixedly connected, the valve core seat 22 has a valve port, and the valve core seat 22 and the noise reduction column 50 are limited and matched.

[0049] When the valve seat portion 20 is a split design, the valve seat portion 20 includes a valve seat 21 and a valve core seat 22. The split structure is relatively simple to process. The valve core seat 22 has a valve port, and the fluid enters through the valve port.

[0050] In other embodiments not shown, the valve seat portion 20 includes a valve seat 21 and a connector. The valve seat 21 has a valve port, and both ends of the connector are respectively connected to the valve seat 21 and the valve tube 10. In this solution, the nut structure 30 can be connected to the valve seat 21 or the connector.

[0051] The valve needle structure 40 can be an integral structure or a split structure. When the valve needle structure 40 is a split structure, it includes a screw, a valve needle sleeve, a valve needle, etc. When the valve needle structure 40 is an integral structure, the valve needle structure 40 includes a screw.

[0052] The end of the nut stud 32 near the valve seat 20 is plugged into one end of the noise reduction stud 50, and this end can have a clearance fit or an interference fit with the noise reduction stud 50. The valve core seat 22 is plugged into the other end of the noise reduction stud 50, and this can have a clearance fit or an interference fit with the valve core seat 22.

[0053] Optionally, the valve seat portion 20 is provided with an annular limiting step, which cooperates with the limiting end of the noise reduction column 50 close to the valve port, thereby positioning the noise reduction column 50.

[0054] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An electronic expansion valve, characterized in that: include: Valve pipe (10); A valve seat portion (20) is connected to one end of the valve tube (10), and the valve seat portion (20) has a valve port; a nut structure (30), at least a portion of the nut structure (30) is located in the valve tube (10), and the nut structure (30) is fixedly connected to the valve seat portion (20); A valve needle structure (40), the valve needle structure (40) is movably passed through the nut structure (30) to open and close the valve port and adjust the opening; a hollow noise reduction column (50), one end of the noise reduction column (50) being in positional cooperation with the valve seat portion (20), the other end of the noise reduction column (50) being in positional cooperation with the nut structure (30), and the noise reduction column (50) being arranged around the valve port and the valve needle structure (40); The nut structure (30) has a connecting channel (60), and the connecting channel (60) connects the inner and outer cavities of the noise reduction column (50) to discharge impurities in the fluid remaining in the noise reduction column (50).

2. The electronic expansion valve according to claim 1, characterized in that: The noise reduction column (50) comprises multiple layers of tubular sintered mesh, which are stacked and arranged, and the total flow area of ​​each layer of the sintered mesh is greater than the flow area of ​​the valve port.

3. The electronic expansion valve according to claim 1, characterized in that: The communication channel (60) includes a first channel (61) and a second channel (62); a rotor cavity is provided between the nut structure (30) and the valve tube (10); the first channel (61) connects the cavity inside the noise reduction column (50) with the rotor cavity; and the second channel (62) connects the rotor cavity with the cavity outside the noise reduction column (50).

4. The electronic expansion valve according to claim 1, characterized in that: The nut structure (30) includes a nut seat (31) and a nut column (32), wherein the nut column (32) is arranged through the nut seat (31), the nut column (32) is fixedly connected to the nut seat (31), and the end of the nut column (32) close to the valve port is inserted into the noise reduction column (50).

5. The electronic expansion valve according to claim 4, characterized in that: The connecting channel (60) includes a first channel (61) located between the nut column (32) and the nut seat (31), and a rotor cavity is provided between the nut structure (30) and the valve tube (10). The first channel (61) connects the cavity inside the noise reduction column (50) with the rotor cavity, and the rotor cavity is connected with the cavity outside the noise reduction column (50).

6. The electronic expansion valve according to claim 5, characterized in that: The side surface of the nut column (32) has at least one first cut surface (321), and the first channel (61) is formed between the first cut surface (321) and the nut seat (31); or the nut seat (31) is punched with a hole to form the first channel (61).

7. The electronic expansion valve according to claim 1, characterized in that: The communicating channel (60) includes a second channel (62) located between the nut structure (30) and the valve seat portion (20), a rotor cavity is provided between the nut structure (30) and the valve tube (10), and the second channel (62) connects the rotor cavity with the cavity outside the noise reduction column (50), and the rotor cavity is connected with the cavity inside the noise reduction column (50).

8. The electronic expansion valve according to claim 7, characterized in that: The nut structure (30) includes a nut seat (31) and a nut column (32); the side surface of the nut seat (31) has at least one second section (311); the second channel (62) is formed between the second section (311) and the valve seat portion (20); or the nut seat (31) is punched with a hole to form the second channel (62).

9. The electronic expansion valve according to claim 1, characterized in that: The valve seat portion (20) has a limiting step (211), and the limiting step (211) is limitedly matched with the nut structure (30). The electronic expansion valve also includes a nut connecting plate (70). The nut structure (30) includes a nut seat (31) and a nut column (32). The nut connecting plate (70) is arranged at one end of the nut seat (31) away from the valve port. The nut connecting plate (70) is fixedly connected to the valve seat portion (20). The nut connecting plate (70) is limitedly matched with the nut seat (31). The nut connecting plate (70) is provided with an avoidance channel to avoid the connecting channel (60).

10. The electronic expansion valve according to claim 1, characterized in that: One end of the noise reduction column (50) abuts against the valve seat portion (20), and the other end of the noise reduction column (50) abuts against one end of the nut structure (30) facing the valve port; or, One end of the noise reduction column (50) is welded and fixed to the valve seat portion (20), and the other end of the noise reduction column (50) is in abutment with or clearance-fitted with the end surface of the nut structure (30) facing the valve port.

11. The electronic expansion valve according to claim 1, characterized in that: The valve seat portion (20) is an integral structure; or, The valve seat portion (20) includes a valve seat (21) and a valve core seat (22), the valve seat (21) is fixedly connected to the valve tube (10), the valve core seat (22) and the valve seat (21) are fixedly connected, the valve core seat (22) has the valve port, and the valve core seat (22) and the noise reduction column (50) are limited and matched.

12. The electronic expansion valve according to claim 1, characterized in that: The valve seat portion (20) comprises a valve seat (21) and a connecting piece, wherein the valve seat (21) has the valve port, and both ends of the connecting piece are respectively connected to the valve seat (21) and the valve pipe (10).

13. The electronic expansion valve according to claim 1, characterized in that The valve seat portion (20) is provided with an annular limiting step, and the annular limiting step is limitedly matched with one end of the noise reduction column (50) close to the valve port.

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