Electronic expansion valve, heat exchange system of heating and ventilation equipment and heating and ventilation equipment

Abstract

The utility model belongs to the technical field of heating and ventilation equipment, and particularly relates to an electronic expansion valve, a heat exchange system of the heating and ventilation equipment and the heating and ventilation equipment. The electronic expansion valve comprises a valve body provided with a valve cavity; the two pipelines are respectively connected with the valve body and are communicated with the valve cavity, and at least one of the two pipelines is internally provided with a filtering piece; wherein the filter part comprises a mounting seat and a filter screen, the mounting seat is fixedly arranged in the pipeline, a reducing section is arranged on one side of the mounting seat, the filter screen is mounted on the peripheral surface of the reducing section, a crimping part is arranged on the inner wall surface of the pipeline, and the crimping part is propped against the peripheral surface of the reducing section, so that part of the filter screen is crimped between the crimping part and the peripheral surface of the reducing section. According to the technical scheme, the occupied space of the electronic expansion valve can be reduced, the assembling efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of heating, ventilation and air conditioning (HVAC) equipment, and particularly relates to an electronic expansion valve, a heat exchange system of HVAC equipment, and HVAC equipment. Background Art

[0002] Currently, in the heat exchange system of HVAC equipment, an electronic expansion valve is generally provided. When installing, a filter is usually welded and connected at both the front and rear ends of the electronic expansion valve to filter impurities in the fluid medium flowing through the electronic expansion valve. However, this installation method will cause the volume of the whole machine system to increase and the cost to rise. Summary of the Utility Model

[0003] The purpose of this application is to provide an electronic expansion valve, a heat exchange system of HVAC equipment, and HVAC equipment, so as to at least solve the problem that a filter is welded and connected at both the front and rear ends of the expansion valve, resulting in an increase in the volume of the whole machine system and an increase in cost. This purpose is achieved in the following way:

[0004] A first aspect of this application provides an electronic expansion valve, including: the valve body has a valve cavity; two pipelines, the two pipelines are respectively connected to the valve body and are both communicated with the valve cavity, and at least one of the two pipelines is provided with a filtering element; wherein, the filtering element includes a mounting seat and a filter net, the mounting seat is fixedly arranged in the pipeline, and a reduced-diameter section is arranged on one side of the mounting seat, the filter net is installed on the outer peripheral surface of the reduced-diameter section, a crimping portion is arranged on the inner wall surface of the pipeline, the crimping portion abuts against the outer peripheral surface of the reduced-diameter section, and part of the filter net is crimped between the outer peripheral surface of the reduced-diameter section and the crimping portion.

[0005] According to the electronic expansion valve provided in the first aspect of the present application, by providing two pipelines communicated with the valve cavity of the valve body, one of the two pipelines can be used as the inlet pipeline, and the other can be used as the outlet pipeline. A filter element can be provided in one of the pipelines used as the inlet pipeline to filter impurities in the fluid medium about to flow into the valve cavity, or a filter element can be provided in one of the pipelines used as the outlet pipeline to filter impurities in the fluid medium flowing out of the valve body, or filter elements can be provided in both pipelines. In this way, not only can impurities in the fluid medium be filtered out before the fluid medium flows into the valve cavity, but also secondary filtration can be carried out before the fluid medium flows into the downstream components of the valve body after passing through the valve body, thereby reducing the risk of blockage and damage of equipment components such as the valve body and the heat exchanger communicated with the valve body, and further improving the use stability and service life of the electronic expansion valve and the supporting components thereof. At the same time, since the filter element is built into the pipeline, there is no need to separately provide filters at the upstream end and the downstream end of the electronic expansion valve, thereby reducing the volume of the product, shrinking the occupied space of the product, improving the assembly efficiency of the product, and reducing the production cost. Specifically, the filter element has a mounting seat and a filter screen mounted on one side of the mounting seat. The mounting seat is fixedly provided in the pipeline, and a reduced-diameter section is provided on one side of the mounting seat, and a crimping portion is provided on the inner wall surface of the pipeline. The filter screen can be sleeved or bonded to the outer peripheral surface of the reduced-diameter section and is crimped between the inner wall surface of the pipeline and the outer peripheral surface of the reduced-diameter section through the crimping portion, which not only has a high assembly efficiency, but also improves the stability and reliability of the filter screen when mounted on the mounting seat, and helps to improve the stability of the filter screen in filtering impurities in the fluid medium.

[0006] In addition, the electronic expansion valve according to the present application may further have the following additional technical features:

[0007] In some embodiments of the present application, filter elements are provided in both of the two pipelines, and both of the two pipelines include a first pipe section, a second pipe section, and a third pipe section that are sequentially communicated. The first pipe section of each pipeline is communicated with the valve cavity; wherein, the inner diameters of the first pipe section and the third pipe section are both smaller than the inner diameter of the second pipe section, and the filter element is provided in the second pipe section.

[0008] In some embodiments of the present application, the crimping portion includes a flange provided circumferentially along the inner wall surface of the second pipe section.

[0009] In some embodiments of the present application, the pipeline further includes a first reduced-diameter pipe section and a second reduced-diameter pipe section. The first reduced-diameter pipe section is located between the first pipe section and the second pipe section, and the first pipe section is transitionally connected to one end of the second pipe section through the first reduced-diameter pipe section. The second reduced-diameter pipe section is located between the second pipe section and the second pipe section, and the third pipe section is transitionally connected to the other end of the second pipe section through the second reduced-diameter pipe section.

[0010] In some embodiments of the present application, the mounting seat is annular and is located on the side of the second pipe segment close to the third pipe segment. The reduced diameter section is provided on the side of the mounting seat facing the first pipe segment, and the end of the mounting seat facing away from the first pipe segment abuts against the inner wall surface of the second reduced diameter pipe segment.

[0011] In some embodiments of the present application, the filter screen is conical, and the diameter of the filter screen gradually decreases along the direction from the third pipe segment to the second pipe segment.

[0012] In some embodiments of the present application, the expanded area of ​​the filter screen is not less than 5 times the cross-sectional area of ​​the third pipe segment.

[0013] In some embodiments of the present application, the valve body is provided with a first interface and a second interface connected to the valve cavity, the first interface is provided at one end of the valve body in the axial direction, the second interface is provided on the peripheral side of the valve body, one of the two pipelines is connected and communicated with the first interface, and the other is connected and communicated with the second interface.

[0014] The second aspect of the present application provides a heat exchange system for HVAC equipment, comprising a compressor, a first heat exchanger, and a second heat exchanger connected in sequence; and an electronic expansion valve as described in any one of the embodiments of the first aspect, wherein the electronic expansion valve is connected between the first heat exchanger and the second heat exchanger.

[0015] A third aspect of the present application provides a HVAC device, comprising a shell and a heat exchange system of the HVAC device as described in the embodiment of the second aspect, wherein the heat exchange system of the HVAC device is arranged in the shell.

[0016] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. In addition, the same reference numerals are used throughout the accompanying drawings to represent the same components. Among them:

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating the preferred embodiments only and are not to be considered as limiting the present application. Also, throughout the drawings, the same reference numerals are used to denote the same components. Wherein:

[0019] Figure 1 is a schematic structural view of an electronic expansion valve provided according to an embodiment of the present application;

[0020] Figure 2 is a schematic structural view of an electronic expansion valve from one perspective provided according to another embodiment of the present application;

[0021] Figure 3 is Figure 2 a schematic structural view of the other perspective of the electronic expansion valve shown;

[0022] Figure 4 is Figure 3 a schematic cross-sectional structural view taken along the line A-A in;

[0023] Figure 5 is Figure 4 a schematic enlarged structural view of part B in;

[0024] Figure 6 is Figure 2 a schematic exploded structural view of the electronic expansion valve shown;

[0025] Figure 7 is a schematic structural view of a heating, ventilation and air conditioning (HVAC) device provided according to an embodiment of the present application.

[0026] The reference numerals in the drawings are represented as follows:

[0027] 100, heating, ventilation and air conditioning (HVAC) device;

[0028] 10, electronic expansion valve; 20, heat exchange system; 30, housing;

[0029] 11, valve body; 111, valve cavity; 12, pipeline; 121, first pipe section; 122, first reduced-diameter pipe section; 123, second pipe section; 1231, crimping part; 124, second reduced-diameter pipe section; 125, third pipe section; 126, elbow; 13, filter element; 131, mounting seat; 1311, reduced-diameter section; 132, filter net. Detailed Embodiments

[0030] Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art.

[0031] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0032] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0033] For ease of description, spatial relative relationship terms may be used in the text to describe the relationship of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms are, for example, "inner", "outer", "inside", "outside", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation in addition to the orientations depicted in the figure. For example, if the device in the figure is flipped, an element described as "below" or "beneath" other elements or features will then be oriented as "above" or "over" other elements or features. Thus, the exemplary term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are accordingly interpreted.

[0034] Please refer to Figures 1 to 6 , an embodiment of the first aspect of the present application provides an electronic expansion valve 10, including: a valve body 11 and two pipelines 12. Among them, the valve body 11 has a valve cavity 111; the two pipelines 12 are connected to the valve body 11 and are both connected to the valve cavity 111, and a filter element 13 is provided in each pipeline 12.

[0035] Specifically, the filter element 13 includes a mounting seat 131 and a filter mesh 132. The mounting seat 131 is fixedly arranged in the pipeline 12, and a reduced-diameter section 1311 is provided on one side of the mounting seat 131. The filter mesh 132 is installed on the outer peripheral surface of the reduced-diameter section 1311. A crimping portion 1231 is provided on the inner wall surface of the pipeline 12. The crimping portion 1231 abuts against the outer peripheral surface of the reduced-diameter section 1311, and part of the filter mesh 132 is crimped between the outer peripheral surface of the reduced-diameter section 1311 and the crimping portion 1231.

[0036] The electronic expansion valve 10 is a throttling element for regulating the flow rate of fluid media such as refrigerant in the refrigerant flow path of HVAC equipment 100 such as air conditioners.

[0037] Exemplarily, one of the two pipelines 12 communicating with the valve cavity 111 of the valve body 11 is an inlet pipeline, and the other is an outlet pipeline.

[0038] The mounting seat 131 is a component for mounting and fixing the filter mesh 132.

[0039] The filter mesh 132 can be a metal mesh or a plastic mesh with multiple filter holes. Among them, after the filter mesh 132 is installed, the side of the filter mesh 132 away from the mounting seat 131 is in a closed state, so that impurities in the fluid medium can be filtered out on the side of the filter mesh 132 facing the mounting seat 131.

[0040] One side of the mounting base 131 is provided with a reduced-diameter section 1311, which means that the diameter of the outer peripheral surface of one side of the mounting base 131 gradually decreases or is locally concave.

[0041] The crimping portion 1231 can be a rib or a flange provided on the inner wall surface of the pipeline 12. It can be understood that the position of the crimping portion 1231 corresponds to the position of the reduced-diameter section 1311, and it can not only cooperate with the reduced-diameter section 1311 to fix the mounting base 131, but also cooperate with the reduced-diameter section 1311 to clamp a part of the filter net 132.

[0042] According to the electronic expansion valve 10 provided by the first aspect embodiment of the present application, by providing two pipelines 12 communicated with the valve cavity 111 of the valve body 11, and filter elements 13 are provided in both of the two pipelines 12. In this way, not only can impurities in the fluid medium be filtered out before the fluid medium flows into the valve cavity 111, but also secondary filtration can be carried out before the fluid medium flows into the downstream components of the valve body 11 after passing through the valve body 11, thereby reducing the risk of blockage and damage of the valve body 11 and equipment components such as heat exchangers communicated with the valve body 11, and further improving the use stability and service life of the electronic expansion valve 10 and the supporting components of the electronic expansion valve 10. At the same time, since the filter element 13 is built in the pipeline 12, there is no need to separately provide filters at the upstream end and the downstream end of the electronic expansion valve 10, thereby reducing the volume of the product, reducing the occupied space of the product, improving the assembly efficiency of the product, and reducing the production cost. Specifically, the filter element 13 has a mounting base 131 and a filter net installed on one side of the mounting base 131. The mounting base 131 is fixedly arranged in the pipeline 12, and a reduced-diameter section 1311 is provided on one side of the mounting base 131, and a crimping portion 1231 is provided on the inner wall surface of the pipeline 12. The filter net 132 can be sleeved or bonded to the outer peripheral surface of the reduced-diameter section 1311 and is crimped between the inner wall surface of the pipeline 12 and the outer peripheral surface of the reduced-diameter section 1311 through the crimping portion 1231. Not only is the assembly efficiency relatively high, but also the stability and reliability of the filter net 132 when installed on the mounting base 131 can be improved, and it helps to improve the stability of the filter net 132 in filtering impurities in the fluid medium.

[0043] Please refer to Figure 4 , according to some embodiments of the present application, each pipeline 12 includes a first pipe section 121, a second pipe section 123 and a third pipe section 125 that are sequentially communicated, and the first pipe section 121 of each pipeline 12 is communicated with the valve cavity 111; wherein, the inner diameters of the first pipe section 121 and the third pipe section 125 are both smaller than the inner diameter of the second pipe section 123, and the filter element 13 is arranged in the second pipe section 123.

[0044] Exemplarily, the first pipe section 121, the second pipe section 123, and the third pipe section 125 are coaxially arranged. The inner diameters of the first pipe section 121 and the third pipe section 125 may be the same or different. Among them, the first pipe section 121 may be directly or indirectly connected to the valve cavity 111.

[0045] A filter element 13 is provided in the second pipe section 123. That is, after the fluid medium enters the second pipe section 123, the impurities in the fluid medium can be filtered out by the filter net 132 in the second pipe section 123.

[0046] By setting the inner diameter of the second pipe section 123 to be larger than the inner diameters of the first pipe section 121 and the third pipe section 125, when the fluid medium enters the second pipe section 123 from the first pipe section 121 or enters the second pipe section 123 from the third pipe section 125, the fluid medium flows from a smaller space into a larger space, and the flow rate can be reduced, which helps to reduce noise and improve the user experience.

[0047] Please refer to Figure 4 and Figure 5 , according to some embodiments of the present application, the crimping portion 1231 includes a flange circumferentially arranged along the inner wall surface of the second pipe section 123.

[0048] Exemplarily, the flange may be formed by local depression of the outer peripheral surface of the second pipe section 123.

[0049] By circumferentially arranging a flange on the inner wall surface of the second pipe section 123, the size of the flange is adapted to the reduced diameter section 1311 on the mounting seat 131, so that the flange can abut against the outer peripheral surface of the reduced diameter section 1311, and thus can cooperate with the reduced diameter section 1311 to clamp part of the filter net 132, so as to improve the reliability and stability of the installation of the filter net 132.

[0050] In some embodiments, one end of the third pipe section 125 may be inserted into the second pipe section 123 and sealedly connected to the second pipe section 123. When the mounting seat 131 is installed in the second pipe section 123, one end of the mounting seat 131 abuts against the end of the second pipe section 123, and the other end abuts and cooperates with the reduced diameter section 1311 through the flange, thereby restricting the mounting seat 131 from moving along the axial direction of the second pipe section 123.

[0051] Please refer to Figure 4 and Figure 5 , according to some embodiments of the present application, the first pipe section 121 is transitionally connected to one end of the second pipe section 123 through a first reduced diameter pipe section 122, and the third pipe section 125 is transitionally connected to the other end of the second pipe section 123 through a second reduced diameter pipe section 124.

[0052] It can be understood that the diameter of the first reducing pipe section 122 gradually increases along the direction from the first pipe section 121 to the second pipe section 123 , and the diameter of the second reducing pipe section 124 gradually decreases along the direction from the first pipe section 121 to the second pipe section 123 .

[0053] By setting the first reducing pipe section 122 between the first pipe section 121 and the second pipe section 123, and setting the second reducing pipe section 124 between the second pipe section 123 and the third pipe section 125, not only the overall aesthetics of the product can be improved, but also a transition connection can be played, which helps to reduce the flow resistance of the fluid medium when it flows into and out of the second pipe section 123.

[0054] See also Figure 4 and Figure 5 According to some embodiments of the present application, the mounting seat 131 is annular and is located on the side of the second pipe section 123 close to the third pipe section 125. The mounting seat 131 is provided with a reduced diameter section 1311 on the side facing the first pipe section 121, and the end of the mounting seat 131 facing away from the first pipe section 121 abuts against the inner wall surface of the second reduced diameter pipe section 124.

[0055] The mounting seat 131 is arranged close to the third pipe section 125 and abuts against the inner wall surface of the second reducing pipe section 124, so that the second reducing pipe section 124 and the crimping section can cooperate to limit the movement of the mounting seat 131 along the axial direction of the second pipe section 123, so as to improve the stability and reliability of the installation of the mounting seat 131.

[0056] Specifically, the outer diameter of the side of the mounting seat 131 facing the third pipe segment 125 is adapted to the inner diameter of the second pipe segment 123, so that the outer wall surface of the side of the mounting seat 131 facing the third pipe segment 125 can be in contact and connected with the inner wall surface of the second pipe segment 123, so that the fluid medium can only flow from the inside of the mounting seat 131.

[0057] The first mounting seat 131 has a first opening and a second opening on opposite sides, the first opening is arranged toward the first pipe section 121, and the second opening is arranged toward the third pipe section 125. When the pipeline 12 is an inlet pipeline, the fluid medium can flow into the second pipeline 12 from the third pipe section 125 and the second opening; when the pipeline 12 is an outlet pipeline, the fluid medium can flow from the first pipe section 121 into the second pipe section 123, and flow into the third pipe section 125 from the second opening after being filtered by the filter screen 132.

[0058] See also Figure 4 According to some embodiments of the present application, the filter screen 132 is conical, and the diameter of the filter screen 132 gradually decreases along the direction from the third pipe section 125 to the second pipe section 123.

[0059] It can be understood that when the filter net 132 is conical, the filter net 132 can define a filtering cavity, so that when the fluid medium flows from the third pipe section 125 into the second pipe section 123, the impurities in the fluid medium can be filtered out in the filtering cavity.

[0060] By setting the diameter of the filter net 132 to gradually decrease along the direction from the third pipe section 125 to the second pipe section 123, a gap is formed between the filter net 132 and the inner wall surface of the second pipe section 123. Thus, when the fluid medium flows from the first pipe section 121 into the second pipe section 123, the impurities in the fluid medium can be filtered out in the gap between the filter net 132 and the inner wall surface of the second pipe section 123.

[0061] According to some embodiments of the present application, the unfolded area of the filter net 132 is not less than 5 times the cross-sectional area of the third pipe section 125.

[0062] Exemplarily, the unfolded area of the filter net 132 is 6 times or more the cross-sectional area of the third pipe section 125.

[0063] When the unfolded area of the filter net 132 is less than 5 times the cross-sectional area of the third pipe section 125, the filtering area of the filter net 132 is small, the filtering efficiency is low, and there is a risk that the filter net 132 is easily blocked. Therefore, by setting the unfolded area of the filter net 132 to be 5 times or more the cross-sectional area of the third pipe section 125, the filtering area of the filter net 132 can be increased, so as to improve the filtering efficiency of the filter net 132 for the impurities in the fluid medium and reduce the risk of the filter net 132 being blocked.

[0064] According to some embodiments of the present application, the valve body 11 is provided with a first interface and a second interface communicating with the valve cavity 111. The first interface is provided at one end of the valve body 11 in the axial direction, and the second interface is provided on the circumferential side of the valve body 11. One of the two pipelines 12 is connected and communicated with the first interface, and the other is connected and communicated with the second interface.

[0065] Exemplarily, as Figure 1 shown, the first interface and the valve cavity 111 are arranged along the same axis, so that one pipeline 12 connected and communicated with the first interface is coaxially arranged with the valve body 11. The other pipeline 12 connected and communicated with the second interface can be arranged intersecting with the valve body 11.

[0066] Or, as Figure 2 and Figure 6 shown, the other pipeline 12 connected and communicated with the second interface can be arranged in parallel with the one pipeline 12 connected and communicated with the first interface by adding a bent pipe 126, so as to further reduce the volume of the product, reduce the occupied space, and adapt to the installation environment of the product.

[0067] Exemplarily, the two pipelines 12 can be respectively welded or threaded to the first interface and the second interface.

[0068] In the embodiment of the second aspect of the present application, a heat exchange system 20 of a heating, ventilation and air conditioning (HVAC) device 100 is provided. The heat exchange system 20 of the HVAC device 100 includes a compressor, a first heat exchanger, and a second heat exchanger that are connected in sequence; and an electronic expansion valve 10 as described in any one of the embodiments of the first aspect, and the electronic expansion valve 10 is connected between the first heat exchanger and the second heat exchanger.

[0069] Since the heat exchange system 20 of the HVAC device 100 provided in the embodiment of the second aspect of the present application includes the electronic expansion valve 10 described in any one of the embodiments of the first aspect, it has the technical effects of any of the above embodiments, which will not be elaborated here.

[0070] Please refer to Figure 7 , in the third aspect of the present application, an HVAC device 100 is provided, which includes a housing 30 and the heat exchange system 20 of the HVAC device as described in the embodiment of the second aspect, and the heat exchange system 20 of the HVAC device is disposed inside the housing 30.

[0071] The HVAC device 100 provided in the embodiment of the third aspect of the present application can be devices for refrigeration or heating such as air conditioners, heat pumps, and multi-connected systems. Since it includes the heat exchange system 20 of the HVAC device described in any one of the embodiments of the second aspect, it has the technical effects of any of the above embodiments, which will not be elaborated here.

[0072] As described above, only the preferred specific embodiments of the present application are provided, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An electronic expansion valve, characterized in that: include: A valve body, wherein the valve body has a valve cavity; Two pipelines, the two pipelines are respectively connected to the valve body and communicated with the valve cavity, and at least one of the two pipelines is provided with a filter; Wherein, the filter element includes a mounting seat and a filter screen, the mounting seat is fixedly arranged in the pipeline, and a reduced diameter section is provided on one side of the mounting seat, the filter screen is installed on the outer circumferential surface of the reduced diameter section, and the inner wall surface of the pipeline is provided with a crimping portion, the crimping portion is abutted against the outer circumferential surface of the reduced diameter section, so that part of the filter screen is crimped between the outer circumferential surface of the reduced diameter section and the crimping portion.

2. The electronic expansion valve according to claim 1, characterized in that: A filter is provided in each of the two pipelines, and each of the two pipelines comprises a first pipe section, a second pipe section and a third pipe section which are connected in sequence, and the first pipe section of each pipeline is connected to the valve cavity; Wherein, the inner diameter of the first pipe section and the inner diameter of the third pipe section are both smaller than the inner diameter of the second pipe section, and the filter element is arranged in the second pipe section.

3. The electronic expansion valve according to claim 2, characterized in that: The crimping portion includes a flange arranged along the circumference of the inner wall surface of the second pipe segment.

4. The electronic expansion valve according to claim 2, characterized in that: The pipeline also includes a first reducing pipe section and a second reducing pipe section, the first reducing pipe section is located between the first pipe section and the second pipe section, the first pipe section is transitionally connected to one end of the second pipe section through the first reducing pipe section, the second reducing pipe section is located between the second pipe section and the second pipe section, and the third pipe section is transitionally connected to the other end of the second pipe section through the second reducing pipe section.

5. The electronic expansion valve according to claim 4, characterized in that: The mounting seat is annular and is located on the side of the second pipe section close to the third pipe section. The mounting seat is provided with the reduced diameter section on the side facing the first pipe section. The end of the mounting seat facing away from the first pipe section abuts against the inner wall surface of the second reduced diameter pipe section.

6. The electronic expansion valve according to any one of claims 2 to 5, characterized in that: The filter screen is conical, and the diameter of the filter screen gradually decreases along the direction from the third pipe section to the second pipe section.

7. The electronic expansion valve according to any one of claims 2 to 5, characterized in that: The expanded area of ​​the filter screen is not less than 5 times the cross-sectional area of ​​the third pipe section.

8. The electronic expansion valve according to any one of claims 1 to 5, characterized in that: The valve body is provided with a first interface and a second interface connected to the valve cavity, the first interface is provided at one end of the valve body in the axial direction, and the second interface is provided on the peripheral side of the valve body, one of the two pipelines is connected and communicated with the first interface, and the other is connected and communicated with the second interface.

9. A heat exchange system for HVAC equipment, characterized in that: It includes a compressor, a first heat exchanger, and a second heat exchanger which are connected in sequence; as well as The electronic expansion valve according to any one of claims 1 to 8, wherein the electronic expansion valve is connected between the first heat exchanger and the second heat exchanger.

10. A HVAC equipment, characterized in that: It comprises a shell and the heat exchange system of the HVAC equipment as claimed in claim 9, wherein the heat exchange system of the HVAC equipment is arranged in the shell.

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