Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve which comprises a valve pipe, a valve seat part, a nut structure, a valve needle structure and a hollow noise reduction column, the valve seat part is connected with one end of the valve pipe, and the valve seat part is provided with a valve port; at least one part of the nut structure is located in the valve pipe, and the nut structure is fixedly connected with the valve seat part; the valve needle structure movably penetrates through the nut structure so as to open and close the electronic expansion valve and adjust the opening degree of the valve port. One end of the noise reduction column is in limiting fit with the valve seat part, 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 communication channel, and the communication channel enables the inner cavity and the outer cavity of the noise reduction column to be communicated so as to discharge impurities, remaining in the noise reduction column, in fluid. When fluid flows through the noise reduction columns, the noise reduction columns refine bubbles in the fluid for noise reduction. And impurities in the noise reduction column are discharged out of the noise reduction column through the communication channel. According to the scheme, the problem that noise is generated in the using process of the electronic expansion valve is solved, and impurity blockage is avoided.

Description

Technical Field

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

[0002] There is no noise reduction element before and after the valve port of the electronic expansion valve, so bubbles cannot be filtered. When the refrigerant before the electronic expansion valve is in a two-phase state, the uneven bubbles in the refrigerant cause discontinuous noise when passing through the electronic expansion valve. Therefore, an electronic expansion valve that can solve the problem of noise during use is needed. Utility Model Content

[0003] The utility model provides an electronic expansion valve to solve the problem of noise generated during the use of the electronic expansion valve in the prior art.

[0004] In order to solve the above problems, the utility model 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 movably pass 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, 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.

[0005] Furthermore, the noise reduction column includes multiple layers of tubular sintered meshes, 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.

[0006] Furthermore, the connecting channel includes a first channel and a second channel, and a rotor cavity is provided 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.

[0007] Furthermore, the nut structure includes a nut seat and a nut column. The nut column is arranged through the nut seat. The nut column is fixedly connected to the nut seat. The noise reduction column is inserted into one end of the nut column close to the valve port.

[0008] Furthermore, the connecting channel includes a first channel located between the nut column and the nut seat, and a rotor cavity is provided 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.

[0009] 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.

[0010] Furthermore, the connecting channel includes a second channel located between the nut structure and the valve seat portion, and a rotor cavity is provided 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.

[0011] Furthermore, the nut structure includes a nut seat and a nut column, 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.

[0012] 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 an end of the nut seat away from the valve port. The nut connecting plate is fixedly connected to the valve seat portion, and the nut connecting plate is limited by the nut seat. The nut connecting plate is provided with an avoidance channel to avoid the connecting channel.

[0013] 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 toward 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 toward the valve port.

[0014] Further, 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 tube, 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 and matched.

[0015] By applying the technical solution of the utility model, an electronic expansion valve is provided, including a valve tube, a valve seat, a nut structure, a valve needle structure and a hollow noise reduction column, wherein the valve seat is connected to one end of the valve tube, and the valve seat has a valve port; at least a part of the nut structure is located in 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 limitedly matched with the valve seat, 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, and the connecting channel connects the inner and outer cavities of the noise reduction column to discharge impurities in the noise reduction column remaining 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 two ends of the noise reduction column are limited by the valve seat and the nut structure respectively. 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, and the inner and outer cavities of the noise reduction column are connected through the connecting channel, so that 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 by 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

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the structure of an electronic expansion valve provided in an embodiment of the utility model is shown;

[0018] Figure 2 Shows Figure 1 Schematic diagram of the structure of the nut structure of the electronic expansion valve.

[0019] The above drawings include the following reference numerals:

[0020] 10. Valve pipe;

[0021] 20. Valve seat portion; 21. Valve seat; 211. Limiting step; 22. Valve core seat;

[0022] 30. Nut structure; 31. Nut seat; 311. Second section; 32. Nut column; 321. First section;

[0023] 40. Valve needle structure;

[0024] 50. Noise reduction column;

[0025] 60, connecting channel; 61, first channel; 62, second channel;

[0026] 70. Nut connecting plate. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0028] like Figure 1 to Figure 2 As shown, an embodiment of the utility model 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 movably pass 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, and the connecting channel 60 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.

[0029] With this solution, the fluid enters the valve seat 20 and the 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 and opening degree of the valve port. The two ends of the noise reduction column 50 are limited by the valve seat 20 and the nut structure 30 respectively. 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, and 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, and the inner and outer cavities of the noise reduction column 50 are connected through the connecting channel 60, so that the impurities remaining in the internal cavity of the noise reduction column 50 can be filtered by the fluid and discharged to the cavity outside the noise reduction column 50, so as to avoid impurities blocking 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 generated during the use of the electronic expansion valve and the problem of being easily blocked by impurities.

[0030] 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.

[0031] Furthermore, the noise reduction column 50 includes multiple layers of tubular sintered mesh, which are stacked and arranged, and the total flow area of ​​each layer of sintered mesh is greater 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.

[0032] In this way, multiple layers of tubular sintered mesh are stacked to form a hollow noise reduction column 50. The sintered mesh filters the fluid, so that the fluid is filtered layer by layer by the sintered mesh to refine the bubbles and eliminate noise. The total flow area of ​​each layer of sintered mesh is larger than the flow area of ​​the valve port, so as to avoid the noise reduction column 50 throttling the fluid entering the valve port.

[0033] In a specific embodiment of the present invention, the sintered mesh has 6-7 layers, and the specification of each layer of the sintered mesh is about 75 meshes.

[0034] like Figure 1 As shown, 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.

[0035] In this arrangement, the first channel 61 connects the cavity in the noise reduction column 50 with the rotor cavity, so that impurities in the cavity in the noise reduction column 50 are transported to the rotor cavity through the first channel 61, and impurities in the rotor cavity are transported to the cavity outside the noise reduction column 50 through the second channel 62.

[0036] like Figure 1 As shown, 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.

[0037] In this configuration, 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 .

[0038] like Figure 1 As shown, the connecting channel 60 includes a first channel 61 located between the nut column 32 and the nut seat 31, and 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.

[0039] In this configuration, a first channel 61 is provided between the nut column 32 and the nut seat 31, and the first channel 61 connects the rotor cavity with the cavity in the noise reduction column 50, so that impurities remaining in the cavity inside the noise reduction column 50 are transported to the rotor cavity through the first channel 61. The rotor cavity is connected to the cavity outside the noise reduction column 50, so that impurities in the cavity inside the noise reduction column 50 are transported to the cavity outside the noise reduction column 50, and the impurities are prevented from clogging the cavity inside the noise reduction column 50.

[0040] like Figure 2 As shown, in a specific embodiment of the present invention, 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 .

[0041] In this configuration, there is a space 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.

[0042] Optionally, in a specific embodiment of the present invention, a hole may be punched on the nut seat 31 to form a first channel 61 to connect the cavity in the noise reduction column 50 with the rotor cavity.

[0043] like Figure 1As shown, 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. The rotor cavity and the cavity inside the noise reduction column 50 are connected.

[0044] In this configuration, a second channel 62 is provided between the nut structure 30 and the valve seat portion 20, so that the rotor cavity is connected to the cavity outside the noise reduction column 50. The rotor cavity is connected to the cavity inside the noise reduction column 50, so that impurities in the cavity inside the noise reduction column 50 enter the rotor cavity, and the second channel 62 transports the impurities in the rotor cavity to the cavity outside the noise reduction column 50, thereby transporting the impurities in the cavity inside the noise reduction column 50 to the cavity outside the noise reduction column 50, avoiding clogging of the noise reduction column 50.

[0045] like Figure 2 As shown, in a specific embodiment of the present invention, 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 cut surface 311 . A second channel 62 is formed between the second cut surface 311 and the valve seat portion 20 .

[0046] In this way, there is a space between the second cut surface 311 and the side wall of the valve seat portion 20, forming a second channel 62, so that impurities in the rotor cavity are transported to the cavity outside the noise reduction column 50 through the second channel 62. The processing of the second cut surface 311 is relatively simple, saving costs.

[0047] Optionally, in a specific embodiment of the present invention, 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 .

[0048] like Figure 1 As shown, 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 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 limitedly matched with the nut seat 31. The nut connecting plate 70 is provided with an avoidance channel to avoid the connecting channel 60.

[0049] In this configuration, the limiting step 211 is limitedly matched with the nut structure 30, and the nut structure 30 is limited in the axial direction. The nut connecting plate 70 is arranged at one end of the nut seat 31 away from the valve port, and is limitedly matched with the nut seat 31. The nut connecting plate 70 is provided with an avoidance channel, and the avoidance channel avoids the communication channel 60, so as to prevent the nut connecting plate 70 from blocking the first channel 61 or the second channel 62.

[0050] like Figure 1As shown, 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.

[0051] 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.

[0052] 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 end faces of the valve seat portion 20 and 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 end faces of the valve seat portion 20 and the nut seat 31 facing the valve port, thereby limiting the noise reduction column 50.

[0053] Further, 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 limitedly matched.

[0054] 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.

[0055] 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.

[0056] The valve needle structure 40 may 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.

[0057] One end of the nut column 32 near the valve seat 20 is plugged into one end of the noise reduction column 50, and the end of the nut column 32 near the valve seat 20 and the noise reduction column 50 can be a clearance fit or an interference fit. The valve core seat 22 is plugged into the other end of the noise reduction column 50, and the valve core seat 22 and the noise reduction column 50 can be a clearance fit or an interference fit.

[0058] 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, so as to position the noise reduction column 50.

[0059] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0060] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0061] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0062] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0063] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0064] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

Claims

1. An electronic expansion valve, characterized in that: include: Valve pipe (10); A valve seat portion (20) connected to one end of the valve tube (10), wherein the valve seat portion (20) has a valve port; a nut structure (30), at least a portion of the nut structure (30) being located in the valve tube (10), and the nut structure (30) and the valve seat portion (20) being fixedly connected; A valve needle structure (40), wherein the valve needle structure (40) is movably inserted 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 limitedly matched with the valve seat portion (20), the other end of the noise reduction column (50) being limitedly matched 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, the multiple layers of sintered mesh are stacked, 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 connecting channel (60) comprises 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) comprises a nut seat (31) and a nut column (32); the nut column (32) is arranged through the nut seat (31); 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).

5. The electronic expansion valve according to claim 4, characterized in that: The connecting passage (60) comprises a first passage (61) located between the nut column (32) and the nut seat (31); a rotor cavity is provided between the nut structure (30) and the valve tube (10); the first passage (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).

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

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

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 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 limitedly matched with the nut seat (31), and 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 fit 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) comprises 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; the valve core seat (22) and the noise reduction column (50) are limitedly matched.

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