Throttling device and air conditioning system

Abstract

The utility model discloses a throttling device and air conditioning system, throttling device includes: valve body, first interface pipe and second interface pipe, is equipped with flow channel cavity in the valve body, has the valve port part for throttling in the flow channel cavity, is established on the valve body and is communicated with the flow channel cavity to the first interface pipe, is established on the valve body and is communicated with the flow channel cavity to the second interface pipe, one of first interface pipe and second interface pipe is suitable for being located the upstream side of valve port part, and the other is suitable for being located the downstream side of valve port part, and at least one of first interface pipe and second interface pipe has throttling pipe section. Therefore, by at least one integrated setting of throttling pipe section in first interface pipe and second interface pipe, can improve the refrigerant sound in the operation of throttling device, need not additional welding other silencing components, facilitate the manufacturing difficulty and production cost of throttling device are reduced.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a throttling device and an air conditioning system. Background Technology

[0002] As an essential component of an air conditioning system, the throttling device plays a role in limiting refrigerant flow. During operation, the refrigerant flowing through the throttling device generates significant noise, resulting in a poor user experience. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a throttling device and an air conditioning system, in which a throttling pipe section is integrated into at least one of the first and second interface pipes, which can improve the refrigerant noise during the operation of the throttling device, without the need for additional welding of other noise-reducing components, thus reducing the manufacturing difficulty and production cost of the throttling device.

[0004] The throttling device according to a first aspect of the present invention includes: a valve body, a first interface pipe and a second interface pipe. The valve body is provided with a flow channel cavity, and the flow channel cavity has a valve port for throttling. The first interface pipe is disposed on the valve body and communicates with the flow channel cavity. The second interface pipe is disposed on the valve body and communicates with the flow channel cavity. One of the first interface pipe and the second interface pipe is adapted to be disposed on the upstream side of the valve port, and the other is adapted to be disposed on the downstream side of the valve port. At least one of the first interface pipe and the second interface pipe has a throttling pipe section.

[0005] According to the embodiment of the present invention, the throttling device has a throttling pipe section integrated in at least one of the first interface pipe and the second interface pipe, which can improve the refrigerant noise during the operation of the throttling device without welding other noise-reducing components. For example, there is no need to weld a transition pipe or capillary tube at the first interface pipe and / or the second interface pipe. That is, the throttling device does not need to weld a transition pipe or capillary tube after the material arrives, so as to reduce the number of weld points at the connection of the throttling device, simplify the processing technology of the throttling device, reduce the manufacturing difficulty and production cost of the throttling device, and facilitate the mass production of the throttling device.

[0006] In some embodiments, the length of the throttling section is greater than or equal to twice the outer diameter of the throttling section; and / or, the outer diameter of the throttling section is less than or equal to 4.8 mm.

[0007] In some embodiments, the flow area of ​​the throttling pipe section is S, 10 mm. 2 ≤S≤14mm 2 ; and / or, the inner diameter of the throttling section is d, 3.6mm≤d≤4.2mm.

[0008] In some embodiments, at least one of the first interface tube and the second interface tube is configured as a capillary.

[0009] In some embodiments, a first mounting port and a second mounting port are formed on the valve body, a first interface pipe is inserted into the first mounting port, and a second interface pipe is inserted into the second mounting port.

[0010] In some embodiments, the throttling device further includes a first filter element disposed within the flow channel cavity and located between the first interface pipe and the valve port; and / or, the throttling device further includes a second filter element disposed within the flow channel cavity and located between the second interface pipe and the valve port.

[0011] In some embodiments, the valve port divides the flow channel cavity into a first chamber and a second chamber. A first interface pipe is connected to the first chamber, and a second interface pipe is connected to the second chamber. A first filter element is provided in the first chamber. The first filter element is formed into a cylindrical structure and its two axial ends are respectively engaged with the corresponding cavity walls of the first chamber. The first interface pipe is located on the peripheral cavity wall of the first chamber and is opposite to the first filter element. And / or, a second filter element is provided in the second chamber. The edge of the second filter element is engaged with the peripheral cavity wall of the second chamber, and the second filter element protrudes toward the second interface pipe.

[0012] In some embodiments, the valve body further includes an installation cavity, and the throttling device further includes a valve core and a drive structure. The valve core is movably disposed in the installation cavity, one end of the valve core extends out of the installation cavity and into the flow channel cavity, and the portion of the valve core extending into the flow channel cavity has a valve needle portion that cooperates with the valve port portion. The outer contour circumference of the valve needle portion varies axially, and the drive structure is disposed in the valve body and cooperates with the valve core for driving the valve core to move axially.

[0013] In some embodiments, the drive structure includes: an electromagnetic coil, a magnetic rotor, and a screw. The electromagnetic coil is sleeved outside the valve body, the magnetic rotor is disposed in the mounting cavity and cooperates with the electromagnetic coil, the screw passes through the magnetic rotor and is threadedly engaged with the magnetic rotor, and the screw is connected to the valve core.

[0014] In some embodiments, an elastic element is connected between the screw and the valve core, the elastic element being used to apply an elastic force that moves the screw and the valve core away from each other.

[0015] In some embodiments, a portion of the valve core passes through the magnetic rotor, and the end of the valve core away from the valve needle has a first limiting portion. A second limiting portion is formed on the inner peripheral wall of the magnetic rotor, and the second limiting portion is adapted to stop the side of the first limiting portion facing the valve needle.

[0016] In some embodiments, the throttling device further includes a sleeve disposed within the flow channel cavity and sleeved over the portion of the valve core that extends into the flow channel cavity. The sleeve is located between the valve port and the first interface pipe to divide the space between the valve port and the first interface pipe into an inner cavity and an outer cavity. The inner cavity communicates with the valve port, and the outer cavity communicates with the first interface pipe. An overflow hole communicating with the inner cavity and the outer cavity is formed on the sleeve.

[0017] In some embodiments, the overflow hole and the first interface pipe are offset in the axial direction; and / or, there are multiple overflow holes and they are spaced apart in the circumferential direction.

[0018] In some embodiments, the valve body includes: a first valve housing, a second valve housing, and a third valve housing. The first valve housing has a mounting cavity. The second valve housing is connected to one end of the first valve housing. A first interface pipe is disposed on the second valve housing. The third valve housing is connected to the end of the second valve housing away from the first valve housing and together with the second valve housing defines a flow channel cavity. The second interface pipe is disposed on the third valve housing. The valve port is located between the second valve housing and the third valve housing.

[0019] An air conditioning system according to a second aspect of the present invention includes a throttling device according to a first aspect of the present invention.

[0020] According to the embodiments of the present invention, the air conditioning system using the throttling device is relatively easy to manufacture, and thus the manufacturing efficiency of the air conditioning system is also relatively convenient.

[0021] In some embodiments, the air conditioning system further includes connecting pipes, with a first interface pipe and a second interface pipe respectively connected to connecting pipes, the flow area of ​​the connecting pipes being greater than the flow area of ​​the throttling pipe section, at least one of the first interface pipes and the second interface pipe being connected to a pre-designed connecting pipe, at least one of the first interface pipes and the second interface pipe being inserted into a constricted pipe section at the end of the corresponding pre-designed connecting pipe, the outer diameter of the portion of the pre-designed connecting pipe excluding the constricted pipe section being greater than or equal to 5 mm; and / or, at least one of the first interface pipes and the second interface pipe is connected to a third filter element between it and the corresponding connecting pipe.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a cross-sectional view of the throttling device in some embodiments of the present invention;

[0025] Figure 2 This is a schematic diagram of the throttling device in some embodiments of the present invention;

[0026] Figure 3 This is a cross-sectional view of the throttling device in some embodiments of the present invention;

[0027] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0028] Figure 5 for Figure 3 A magnified view of a portion of point B in the middle;

[0029] Figure 6 This is a schematic diagram of the throttling device in some embodiments of the present invention;

[0030] Figure 7 This is a schematic diagram of the throttling device in some embodiments of the present invention.

[0031] Reference numerals: Throttling device 100,

[0032] Valve body 1, flow channel cavity 11, first chamber 11a, second chamber 11b, valve port 111, first mounting port 12, second mounting port 13, mounting cavity 14, first valve shell 15, second valve shell 16, third valve shell 17, mounting groove 18, locking protrusion 19, first locking protrusion 191, second locking protrusion 192.

[0033] First interface pipe 21, second interface pipe 22, throttling pipe section 23

[0034] First filter element 31, mounting protrusion 311, second filter element 32, snap fastener 321, third filter element 33, constricted portion 331, valve core 4, valve needle portion 41, first limiting portion 42.

[0035] Drive structure 5, magnetic rotor 52, second limiting part 521, screw 53, elastic element 54

[0036] Sleeve 6, Inner cavity 61, Outer cavity 62, Overflow hole 63,

[0037] Connecting piping 7, constricted pipe section 71. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0040] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0041] Hereinafter, with reference to the accompanying drawings, a throttling device 100 according to a first aspect embodiment of the present invention will be described.

[0042] Please refer to Figure 1 and Figure 2 The throttling device 100 includes: a valve body 1, a first interface pipe 21, and a second interface pipe 22. The valve body 1 has a flow channel cavity 11, which contains a valve port 111 for throttling. The first interface pipe 21 is mounted on the valve body 1 and communicates with the flow channel cavity 11. The second interface pipe 22 is mounted on the valve body 1 and communicates with the flow channel cavity 11. One of the first interface pipe 21 and the second interface pipe 22 is adapted to be located upstream of the valve port 111, and the other is adapted to be located downstream of the valve port 111. For example, the first interface pipe 21 may be located upstream of the valve port 111, and the second interface pipe 22 downstream of the valve port 111; or the second interface pipe 22 may be located upstream of the valve port 111, and the first interface pipe 21 downstream of the valve port 111.

[0043] For example, when the throttling device 100 is used in an air conditioning system, the flow direction of the refrigerant is different in the cooling mode and the heating mode of the air conditioning system. That is, in different modes of the air conditioning system, the first interface pipe 21 and the second interface pipe 22 can be switched between the inlet pipe and the outlet pipe of the flow channel cavity 11, respectively. Of course, the flow direction of the refrigerant flowing through the throttling device 100 in the air conditioning system can always remain unchanged.

[0044] As can be seen, one of the first interface pipe 21 and the second interface pipe 22 can serve as the inlet pipe of the flow channel cavity 11, and the other of the first interface pipe 21 and the second interface pipe 22 can serve as the outlet pipe of the flow channel cavity 11. That is, the refrigerant can flow into the flow channel cavity 11 from one of the first interface pipe 21 and the second interface pipe 22, and after being throttled by the valve port 111, it flows out of the flow channel cavity 11 from the other of the first interface pipe 21 and the second interface pipe 22, so as to realize the throttling effect of the throttling device 100.

[0045] It is understandable that the throttling device 100 can be an electronic expansion valve or a thermal expansion valve, etc.

[0046] In this embodiment, at least one of the first interface pipe 21 and the second interface pipe 22 has a throttling section 23. For example, at least one of the first interface pipe 21 and the second interface pipe 22 is a reducing pipe, so that at least one of the first interface pipe 21 and the second interface pipe 22 has a throttling section 23; of course, at least one of the first interface pipe 21 and the second interface pipe 22 can also be a pipe of equal diameter. Then, at least a portion of the at least one of the first interface pipe 21 and the second interface pipe 22 is formed as a throttling section 23. Taking the first interface pipe 21 having a throttling section 23 as an example, the length of the throttling section 23 is less than or equal to the length of the first interface pipe 21. Moreover, when a portion of the at least one of the first interface pipe 21 and the second interface pipe 22 is formed as a throttling section 23, the location of the throttling section 23 is not limited in this application. Taking the first interface pipe 21 having a throttling section 23 as an example, the throttling section 23 can be located at the end, middle, etc. of the first interface pipe 21.

[0047] It is understood that at least one of the first interface pipe 21 and the second interface pipe 22 has a throttling section 23, including: Example 1, the first interface pipe 21 has a throttling section 23, and the second interface pipe 22 does not have a throttling section 23; Example 2, the first interface pipe 21 does not have a throttling section 23, and the second interface pipe 22 has a throttling section 23; Example 3, both the first interface pipe 21 and the second interface pipe 22 have a throttling section 23.

[0048] It can be seen that one of the first interface pipe 21 and the second interface pipe 22 can be used as the inlet pipe of the flow channel cavity 11, and the other of the first interface pipe 21 and the second interface pipe 22 can be used as the outlet pipe of the flow channel cavity 11. By setting the throttling pipe section 23, the throttling pipe section 23 can throttle and reduce the pressure of the refrigerant flowing through it, thereby reducing the pressure of the refrigerant flowing into and / or out of the flow channel cavity 11, reducing the unstable flow (turbulence, pressure change, cavitation) of the refrigerant during the throttling process of the throttling device 100, thereby reducing the generation of vibration and noise, and effectively improving the refrigerant noise during the operation of the throttling device 100.

[0049] Furthermore, by integrating a throttling pipe section 23 into at least one of the first interface pipe 21 and the second interface pipe 22, the refrigerant noise during the operation of the throttling device 100 can be improved without the need for additional welding of other noise-reducing components. For example, there is no need to additionally weld transition pipes or capillary tubes at the first interface pipe 21 and / or the second interface pipe 22, thereby reducing the number of weld points at the connection points of the throttling device 100, simplifying the processing technology of the throttling device 100, reducing the manufacturing difficulty and production cost of the throttling device 100, and facilitating the mass production of the throttling device 100.

[0050] For example, after receiving the material, at least one of the first interface pipe 21 and the second interface pipe 22 of the throttling device 100 already has a throttling section 23, eliminating the need for additional welding of transition pipes or capillary tubes. This improves the integration of the throttling device 100 and reduces its manufacturing complexity. In contrast, in some technologies, the first and second interface pipes of the throttling device do not have throttling sections after receiving the material. When it is necessary to improve the refrigerant noise during the operation of the throttling device, it is necessary to additionally weld transition pipes or capillary tubes at the first and / or second interface pipes. This results in more welding points at the pipe connections of the throttling device, making the processing technology more complex and increasing the production cost of the throttling device, which is not conducive to the mass production of the throttling device.

[0051] According to the embodiment of the present utility model, the throttling device 100 is provided with a throttling pipe section 23 integrated through at least one of the first interface pipe 21 and the second interface pipe 22. This can improve the refrigerant noise during the operation of the throttling device 100 without the need to weld other noise-reducing components. For example, there is no need to weld transition pipes or capillary tubes at the first interface pipe 21 and / or the second interface pipe 22. That is, the throttling device 100 does not need to weld transition pipes or capillary tubes after receiving the material, so as to reduce the number of weld points at the pipe joints of the throttling device 100, simplify the processing technology of the throttling device 100, reduce the manufacturing difficulty and production cost of the throttling device 100, and facilitate the mass production of the throttling device 100.

[0052] Please refer to Figure 1 In some embodiments, the length of the throttling pipe section 23 (e.g.) Figure 1 L1 in the diagram is greater than or equal to the outer diameter of the throttling pipe section 23 (e.g., L1 in the diagram is greater than or equal to the outer diameter of the throttling pipe section 23). Figure 1 The outer diameter of the throttling pipe section 23 is twice that of D; and / or the outer diameter of the throttling pipe section 23 is twice that of D. Figure 1 The diameter (D) in the figure is less than or equal to 4.8 mm.

[0053] By setting the length of the throttling pipe section 23 to be greater than or equal to twice the outer diameter of the throttling pipe section 23, the throttling pipe section 23 is made to have sufficient length so that the pressure reduction of the refrigerant flowing through it is more stable, the flow velocity of the refrigerant in the throttling pipe section 23 is more stable, the turbulence intensity is reduced, thereby reducing the refrigerant noise caused by fluid vibration and facilitating the improvement of the stability of the throttling device 100.

[0054] By setting the outer diameter of the throttling pipe section 23 to be less than or equal to 4.8 mm, for example, the wall thickness of the throttling pipe section 23 is 0.3 mm to 0.6 mm, and the inner diameter of the throttling pipe section 23 is set to 3.6 mm to 4.2 mm, a more suitable pressure drop is generated when the refrigerant passes through the pipe section, which helps to reduce the pressure difference during the subsequent throttling process through the valve port 111, thereby reducing noise and vibration and improving the refrigerant noise during the operation of the throttling device 100.

[0055] For example, when the throttling device 100 is used in an air conditioning system, the outer diameter of the pipes commonly used in the air conditioning system is 6mm or 6.35mm. That is, the outer diameter of the pipes commonly used in the air conditioning system is larger than the outer diameter of the throttling pipe section 23, so that after the refrigerant in the air conditioning system flows through the aforementioned pipes and passes through the throttling pipe section 23, the throttling pipe section 23 can provide a more suitable pressure drop for the refrigerant flowing through it, thereby improving the refrigerant noise during the operation of the throttling device 100.

[0056] Please refer to Figure 1 In some embodiments, the flow area of ​​the throttling tube section 23 is S, 10 mm. 2 ≤S≤14mm 2 ; and / or, the inner diameter of the throttling pipe section 23 is d, 3.6mm≤d≤4.2mm.

[0057] By setting the flow area of ​​the throttling pipe section 23 to 10 mm 2 Up to 14mm 2 This design ensures that the refrigerant flowing through the throttling pipe section 23 achieves a suitable pressure drop, effectively improving the refrigerant noise during the operation of the throttling device 100, while not excessively restricting the amount of refrigerant flowing through the throttling pipe section 23, thus enhancing the performance and applicability of the throttling device 100. For example, the flow area of ​​the throttling pipe section 23 is 10 mm². 2 11mm 2 12mm 2 13mm 2 Or 14mm 2 wait.

[0058] By setting the inner diameter of the throttling pipe section 23 to 3.6mm to 4.2mm, a suitable pressure drop is generated when the refrigerant passes through the pipe section. This facilitates reducing the pressure difference during the subsequent throttling process at the valve port 111, thereby reducing noise and vibration, improving the refrigerant noise during the operation of the throttling device 100, and ensuring that the amount of refrigerant flowing through the throttling pipe section 23 is not excessively restricted, thus improving the performance and applicability of the throttling device 100. For example, the inner diameter of the throttling pipe section 23 can be 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, or 4.2mm, etc.

[0059] In some embodiments, at least one of the first interface pipe 21 and the second interface pipe 22 is configured as a capillary tube, meaning that all sections of at least one of the first interface pipe 21 and the second interface pipe 22 have a throttling effect, so that the refrigerant after passing through the capillary tube can obtain a more suitable pressure drop, which facilitates reducing the pressure difference during the subsequent throttling process through the valve port 111, thereby reducing noise and vibration, and improving the refrigerant noise during the operation of the throttling device 100, without the need for additional welding of other noise-reducing components. Compared to some technologies that require additional welding of transition pipes or capillary tubes to the inlet / outlet pipes of the throttling device, increasing the number of weld points and processing complexity, and increasing the production cost of the throttling device, this application directly configures the first interface pipe 21 and / or the second interface pipe 22 as a capillary tube, which can reduce the number of weld points, reduce production difficulty and cost, and facilitate the mass production of the throttling device 100.

[0060] Understandably, a capillary tube generally refers to a slender copper tube with an inner diameter of 0.4mm to 2.0mm, designed to reduce the pressure of the refrigerant flowing through it. Of course, capillary tubes can also be of other specifications, as long as they can effectively throttle the refrigerant flowing through them.

[0061] Please refer to Figure 1 In some embodiments, a first mounting port 12 and a second mounting port 13 are formed on the valve body 1, a first interface tube 21 is inserted into the first mounting port 12, and a second interface tube 22 is inserted into the second mounting port 13.

[0062] It can be seen that the first interface tube 21 can be inserted into the first mounting port 12 to make the assembly of the first interface tube 21 and the valve body 1 simpler, and the second interface tube 22 can be inserted into the second mounting port 13 to make the assembly of the second interface tube 22 and the valve body 1 simpler. This facilitates the improvement of the manufacturing efficiency of the throttling device 100 and is conducive to the mass production of the throttling device 100.

[0063] It is understandable that after the first interface tube 21 is inserted into the first mounting port 12, the first interface tube 21 can be welded to the valve body 1 or fixed to the valve body 1 by other means, so as to make the fit between the first interface tube 21 and the valve body 1 more stable and improve the reliability of the throttling device 100. After the second interface tube 22 is inserted into the second mounting port 13, the second interface tube 22 can be welded to the valve body 1 or fixed to the valve body 1 by other means, so as to make the fit between the second interface tube 22 and the valve body 1 more stable and improve the reliability of the throttling device 100.

[0064] Please refer to Figure 3In some embodiments, the throttling device 100 further includes a first filter element 31 disposed in the flow channel cavity 11 and located between the first interface pipe 21 and the valve port portion 111; and / or, the throttling device 100 further includes a second filter element 32 disposed in the flow channel cavity 11 and located between the second interface pipe 22 and the valve port portion 111.

[0065] The first filter element 31 is disposed between the first interface pipe 21 and the valve port 111 so that the refrigerant flowing from the first interface pipe 21 to the valve port 111 can be filtered by the first filter element 31, making the refrigerant flowing to the valve port 111 purer. This reduces the possibility of impurities in the refrigerant flow coming into contact with the valve port 111, making the valve port 111 less susceptible to blockage, wear, or other risks caused by impurities. This allows the valve port 111 to play a more stable throttling role on the refrigerant flowing through it, thereby improving the service life and reliability of the throttling device 100.

[0066] The second filter element 32 is disposed between the second interface pipe 22 and the valve port 111 so that the refrigerant flowing from the second interface pipe 22 to the valve port 111 can be filtered by the second filter element 32, making the refrigerant flowing to the valve port 111 purer. This reduces the possibility of impurities in the refrigerant flow coming into contact with the valve port 111, making the valve port 111 less susceptible to blockage, wear, or other risks caused by impurities. This allows the valve port 111 to play a more stable throttling role on the refrigerant flowing through it, thereby improving the service life and reliability of the throttling device 100.

[0067] Therefore, by providing the first filter element 31 and the second filter element 32, the refrigerant flowing in from either the first interface pipe 21 or the second interface pipe 22 can be better filtered before contacting the valve port 111, thereby reducing the risk of clogging of the valve port 111 and improving the reliability of the throttling device 100.

[0068] Please refer to Figure 3 In some embodiments, the valve port 111 divides the flow channel cavity 11 into a first chamber 11a and a second chamber 11b. The first interface pipe 21 is connected to the first chamber 11a and the second interface pipe 22 is connected to the second chamber 11b. In the refrigerant flow path, the valve port 111 is located between the first interface pipe 21 and the second interface pipe 22.

[0069] The first chamber 11a contains a first filter element 31, which is formed into a cylindrical structure and the first filter element 31 is axially (e.g. Figure 3The two ends of AA') respectively cooperate with the corresponding cavity walls of the first chamber 11a. The first interface tube 21 is provided on the peripheral cavity wall of the first chamber 11a and the first interface tube 21 is opposite to the first filter element 31. For example, the first interface tube 21 is arranged opposite to the peripheral wall of the first filter element 31, and the first filter element 31 surrounds the valve port 111 so that the first filter element 31 separates the first interface tube 21 and the valve port 111; and / or, the second chamber 11b is provided with a second filter element 32. The edge of the second filter element 32 cooperates with the peripheral cavity wall of the second chamber 11b, and the second filter element 32 protrudes toward the second interface tube 22. For example, the second filter element 32 is hemispherical, and the edge of the second filter element 32 cooperates with the peripheral cavity wall of the second chamber 11b so that the second filter element 32 separates the second interface tube 22 and the valve port 111.

[0070] By setting the first filter element 31 as a cylindrical structure, compared with the planar structure, the cylindrical structure of the first filter element 31 can have a larger filtration area, so that the first filter element 31 can accommodate more impurities (such as metal scraps and welding slag), extend the clogging cycle of the first filter element 31, reduce the maintenance frequency, and even if part of the filtration area is covered by impurities, the remaining filtration area can still maintain sufficient flow, avoid the sudden drop in the performance of the throttling device 100 due to local clogging, and facilitate the reliable operation of the throttling device 100. Moreover, by setting the first filter element 31 as a cylindrical structure, it will not greatly restrict the setting position of the first interface pipe 21. As long as the first interface pipe 21 is set on the peripheral cavity wall of the first chamber 11a, the first filter element 31 can better separate the first interface pipe 21 and the valve port 111, which can reduce the manufacturing difficulty of the throttling device 100.

[0071] The second filter element 32 protrudes towards the second interface pipe 22. When refrigerant flows into the second chamber 11b from the second interface pipe 22, it exerts an impact force on the second filter element 32. By setting the second filter element 32, the impact force can be evenly distributed to the edge and then transmitted to the peripheral wall of the second chamber 11b, improving local stress concentration and significantly reducing the risk of deformation or damage to the second filter element 32. Compared with planar filter elements, which have stress concentration in the central area when subjected to fluid impact, and are prone to problems such as filter material fatigue and perforation after long-term operation, the second filter element 32 can disperse the impact, making the second filter element 32 less prone to major damage, thus improving the service life of the second filter element 32 and facilitating the reliable operation of the throttling device 100. At the same time, the second filter element 32 protruding towards the second interface pipe 22 helps to increase the filtration area, improve the filtration effect, and the increased contact area also helps to reduce the risk of local blockage and ensure smooth flow of refrigerant.

[0072] Please refer to Figure 3 and Figure 4In some embodiments, the axial wall of the first chamber 11a and one of the first filter elements 31 are provided with mounting grooves 18, and the other of the axial wall of the first chamber 11a and the first filter element 31 are provided with mounting protrusions 311, which cooperate with the mounting grooves 18. For example, the axial wall of the first chamber 11a is provided with mounting grooves 18, and the first filter element 31 has mounting protrusions 311 at both axial ends. As another example, the axial wall of the first chamber 11a is provided with mounting protrusions 311, and the first filter element 31 has mounting grooves 18 at both axial ends.

[0073] As can be seen, the installation process of the first filter element 31 can be simplified by the cooperation of the mounting protrusion 311 and the mounting groove 18, which facilitates the improvement of the assembly efficiency of the throttling device 100. During the refrigerant flow process, by fitting the mounting protrusion 311 into the mounting groove 18, the first filter element 31 can be effectively prevented from shifting or falling off, ensuring that it is stably set in the designated position, thereby ensuring the reliability of the filtration function.

[0074] Of course, the first filter element 31 can also be fixed to the corresponding cavity wall of the first chamber 11a in other ways, such as by welding, adhesive, threading, etc.

[0075] Please refer to Figure 3 and Figure 5 In some embodiments, a buckle 321 is provided on one of the peripheral cavity wall of the second chamber 11b and the outer periphery of the second filter 32, and a latching protrusion 19 is provided on the other of the peripheral cavity wall of the second chamber 11b and the outer periphery of the second filter 32 to engage with the buckle 321 in an axial limiting manner.

[0076] As can be seen, the installation process of the second filter element 32 is simplified by the cooperation of the snap-fit ​​321 and the snap-fit ​​protrusion 19. The second filter element 32 can be positioned and fixed by simply pushing it into the second chamber 11b along the axial direction. The operation is simple and the assembly efficiency is high. During the refrigerant flow, the snap-fit ​​interface can effectively prevent the second filter element 32 from shifting or falling off, ensuring that it is stably set in the designated position, thereby ensuring the reliability of the filtration function.

[0077] Furthermore, the locking protrusion 19 is disposed on the inner wall of the second chamber 11b, and the locking protrusion 19 includes: a first locking protrusion 191 and a second locking protrusion 192 disposed axially spaced apart. The second filter element 32 is provided with a buckle 321, which limits the engagement between the first locking protrusion 191 and the second locking protrusion 192. This can limit the axial installation position of the second filter element 32. At the same time, the first locking protrusion 191 is located between the second locking protrusion 192 and the second interface tube 22. The protrusion height of the first locking protrusion 191 is less than the protrusion height of the second locking protrusion 192. The second filter element 32 can engage in the direction from the first locking protrusion 191 toward the second locking protrusion 192 to prevent over-installation.

[0078] Of course, the second filter element 32 can also be fixed to the peripheral wall of the second chamber 11b in other ways, such as by welding, adhesive, threading, etc.

[0079] Please refer to Figure 1 In some embodiments, the valve body 1 also has an installation cavity 14. The throttling device 100 further includes a valve core 4 and a drive structure 5. The valve core 4 is movably disposed in the installation cavity 14. One end of the valve core 4 extends out of the installation cavity 14 and the aforementioned end of the valve core 4 extends into the flow channel cavity 11. The portion of the valve core 4 extending into the flow channel cavity 11 has a valve needle portion 41 that cooperates with the valve port portion 111. The outer contour circumference of the valve needle portion 41 varies along the axial direction. The drive structure 5 is disposed in the valve body 1 and cooperates with the valve core 4 to drive the valve core 4 to move axially.

[0080] It is evident that the throttling capacity of the throttling device 100 is adjustable, or in other words, the opening degree of the throttling device 100 is adjustable. Specifically, the valve core 4 is driven to move axially by the drive structure 5, thereby changing the flow passage between the valve needle portion 41 and the valve port portion 111, thus achieving continuous adjustment of the flow area. This adjustable throttling method allows the throttling device 100 to adapt to the flow and pressure control requirements under different operating conditions, thereby improving the adjustment accuracy of the throttling device 100. For example, when the valve core 4 drives the valve needle portion 41 to move axially, the valve needle portion 41 moves within the valve port portion 111, thereby changing the cross-sectional area of ​​the flow passage between the outer circumferential surface of the valve needle portion 41 and the inner wall of the valve port portion 111, achieving continuous adjustment of the refrigerant flow and pressure.

[0081] Optionally, the valve needle portion 41 can be conical or have other gradually changing structures. When the valve core 4 moves axially, the flow area of ​​the flow passage changes continuously, thereby achieving precise control of the refrigerant flow and pressure. The cross-section of the valve needle portion 41 can be circular or other shapes, and the valve port portion 111 is constructed to fit the cross-section of the regulating head to achieve precise fit and throttling control.

[0082] It is understandable that the structural design of the valve port 111 in this application is also very flexible. In some embodiments, the inner diameter of the valve port 111 is gradually varied along the axial direction. For example, it can change from large to small or from small to large, forming a channel structure with a conical, parabolic, or other curved shape. In this way, during the interaction between the valve port 111 and the valve needle 41, the change in the inner diameter of the valve port 111 along the axial direction alters the cross-sectional area of ​​the flow passage between the valve needle 41 and the valve port 111, thereby achieving the regulation of refrigerant flow and pressure.

[0083] In some embodiments, the drive structure 5 may include a stepper motor, a servo motor, or other types of electric drive devices. These drive devices are used to adjust the position of the valve core 4 to control the throttling opening and refrigerant flow rate. For example, when the drive structure 5 includes a stepper motor, the throttling device 100 has a lower cost and is more economical. As another example, when the drive assembly includes a servo motor, the servo motor can steplessly adjust the position of the valve core 4, enabling the throttling device 100 to achieve a high-precision throttling and pressure reduction effect.

[0084] Please refer to Figure 1 In some embodiments, the drive structure 5 includes an electromagnetic coil, a magnetic rotor 52, and a screw 53. The electromagnetic coil is sleeved outside the valve body 1, so the electromagnetic coil does not occupy the internal space of the valve body 1. The magnetic rotor 52 is located in the mounting cavity 14 and cooperates with the electromagnetic coil. The screw 53 passes through the magnetic rotor 52 and is threadedly engaged with the magnetic rotor 52. The screw 53 is connected to the valve core 4.

[0085] As is well known to those skilled in the art, when the electromagnetic coil is energized, a rotating magnetic field is generated, thereby driving the magnetic rotor 52 to rotate. The screw 53 is threadedly engaged with the magnetic rotor 52, thus converting the rotational motion into linear motion, ultimately driving the valve core 4 to move axially. For example, the magnetic rotor 52 has an internal thread structure, and the screw 53 has an external thread structure. As the magnetic rotor 52 rotates, the screw 53 can move in the axial direction, thereby driving the valve core 4 connected to it to move axially, achieving precise adjustment of the throttling opening.

[0086] Please refer to Figure 1 In some embodiments, an elastic element 54 is connected between the screw 53 and the valve core 4.

[0087] As can be seen, the elastic element 54 can provide preload during the movement of the screw 53, ensuring that the axial movement of the screw 53 can be reliably transmitted to the valve core 4. Optionally, the elastic element 54 includes elements with elasticity such as springs, rubber rings, or wave-shaped gaskets. These structures can provide a stable preload between the screw 53 and the valve core 4, ensuring continuous and reliable transmission. At the same time, these elastic elements can also absorb mechanical vibrations, improving the stability and durability of the throttling device 100.

[0088] The elastic element 54 is used to apply an elastic force to the screw 53 and the valve core 4 to keep them apart. When the refrigerant enters the flow channel cavity 11 through the first interface pipe 21 and / or the second interface pipe 22, the refrigerant will exert a certain impact on the valve needle 41. By setting the elastic element 54, the valve needle 41 is not easily affected by the impact of the refrigerant, so that the fit between the valve needle 41 and the valve port 111 is not changed. That is, the flow area between the valve needle 41 and the valve port 111 will not be changed, so that the throttling device 100 can achieve precise adjustment of the throttling opening, which facilitates the improvement of the reliability of the throttling device 100.

[0089] Please refer to Figure 1 In some embodiments, a portion of the valve core 4 passes through the magnetic rotor 52. The end of the valve core 4 away from the valve needle portion 41 has a first limiting portion 42. A second limiting portion 521 is formed on the inner peripheral wall of the magnetic rotor 52. The second limiting portion 521 is adapted to stop on the side of the first limiting portion 42 facing the valve needle portion 41. The elastic member 54 can apply an elastic force that is far away from each other to the screw 53 and the valve core 4. By setting the second limiting portion 521, it is convenient for the second limiting portion 521 to share part of the elastic force of the elastic member 54 when the valve core 2 is in certain positions, so that the elastic force of the elastic member 54 is not entirely borne by the valve needle portion 41, so that the force on the valve needle portion 41 is not too large, and the valve needle portion 41 is not prone to deformation or damage due to elastic force, which can improve the service life of the valve needle portion 41 and thus improve the reliability of the throttling device 100.

[0090] Please refer to Figure 1 In some embodiments, the throttling device 100 further includes a sleeve 6, which is disposed in the flow channel cavity 11 and sleeved over the portion of the valve core 4 that extends into the flow channel cavity 11. The sleeve 6 is located between the valve port portion 111 and the first interface pipe 21 to divide the space between the valve port portion 111 and the first interface pipe 21 into an inner cavity 61 and an outer cavity 62. The inner cavity 61 is connected to the valve port portion 111, and the outer cavity 62 is connected to the first interface pipe 21. An overflow hole 63 is formed on the sleeve 6 to connect the inner cavity 61 and the outer cavity 62.

[0091] As can be seen, after the refrigerant enters the inner cavity 61 through the first interface pipe 21, it first contacts the sleeve 6. The sleeve 6 can disperse the impact of the refrigerant and prevent the refrigerant from directly acting on the surface of the valve core 4, so that the valve core 4 is not easily subjected to large impacts. At the same time, the sleeve 6 is provided with an overflow hole 63, through which the refrigerant can enter the inner cavity 61, so that the refrigerant can contact the valve core 4 more gently, thereby protecting the valve core 4 and improving the smoothness and reliability of the operation of the throttling device 100. Moreover, by setting the overflow hole 63, the gaseous refrigerant and liquid refrigerant can be mixed more evenly, so that the refrigerant flow is more stable and it is easier to improve the refrigerant noise during the operation of the throttling device 100.

[0092] For example, the valve port 111 divides the flow channel cavity 11 into a first chamber 11a and a second chamber 11b. The first interface pipe 21 is connected to the first chamber 11a, and the second interface pipe 22 is connected to the second chamber 11b. The sleeve 6 and the first filter element 31 are both located in the first chamber 11a, and the first filter element 31 is sleeved outside the sleeve 6. Thus, the first filter element 31 is located in the outer cavity 62 and separates the sleeve 6 and the first interface pipe 21, which facilitates buffering the impact of the refrigerant on the sleeve 6 to a certain extent.

[0093] In some embodiments, the overflow hole 63 and the first interface pipe 21 are offset in the axial direction, which can reduce the impact of the refrigerant's impact kinetic energy on the refrigerant flow. This allows the refrigerant to be introduced from the first interface pipe 21 and fill the outer cavity 62 before entering the inner cavity 61 through the overflow hole 63, or the refrigerant to enter the outer cavity 62 from the inner cavity 61 and fill the outer cavity 62 before being discharged from the first interface pipe 21. This reduces the refrigerant flow rate in the impact valve needle 41, improving reliability and durability. And / or, there are multiple overflow holes 63 arranged circumferentially at intervals. The multiple overflow holes 63 are arranged circumferentially to ensure that the refrigerant is evenly distributed in the circumferential direction when entering the inner cavity 61, thereby improving the smoothness of the valve core 4's operation, reducing control deviations caused by excessive or insufficient local pressure, and ultimately improving the adjustment accuracy of the throttling device 100.

[0094] Please refer to Figure 1 In some embodiments, the valve body 1 includes a first valve housing 15, a second valve housing 16, and a third valve housing 17. The first valve housing 15 has a mounting cavity 14. The second valve housing 16 is connected to one end of the first valve housing 15. A first interface pipe 21 is disposed on the second valve housing 16. The third valve housing 17 is connected to the end of the second valve housing 16 away from the first valve housing 15, and the third valve housing 17 and the second valve housing 16 together define a flow channel cavity 11. A second interface pipe 22 is disposed on the third valve housing 17. A valve port 111 is located between the second valve housing 16 and the third valve housing 17. For example, the first valve housing 15, the second valve housing 16, and the third valve housing 17 are arranged sequentially along the axial direction.

[0095] As can be seen, the second valve housing 16 is connected to one end of the first valve housing 15. For example, the second valve housing 16 and the first valve housing 15 are fixedly connected by means of threaded connection, welding or other methods, so that the mounting cavity 14 can be relatively sealed, which facilitates the sealing and protection of the drive structure 5 and ensures its stable and reliable operation. The third valve housing 17 is connected to the end of the second valve housing 16 away from the first valve housing 15. For example, the third valve housing 17 and the second valve housing 16 are fixedly and sealedly connected by means of threaded connection, welding or other methods.

[0096] Furthermore, the valve port 111 is located between the second valve housing 16 and the third valve housing 17, and the third valve housing 17 and the second valve housing 16 together define the flow channel cavity 11. The first interface pipe 21 is provided on the second valve housing 16, and the second interface pipe 22 is provided on the third valve housing 17, so that the refrigerant can flow into or out of the flow channel cavity 11 through the first interface pipe 21, and the refrigerant can flow into or out of the flow channel cavity 11 through the second interface pipe 22. When passing through the valve port 111, throttling and pressure reduction are achieved, thereby realizing the regulation of refrigerant flow and pressure, which facilitates the improvement of the stability of the throttling device 100.

[0097] An air conditioning system according to a second aspect of the present invention includes a throttling device 100 according to a first aspect of the present invention.

[0098] For example, the air conditioning system includes an indoor heat exchanger and an outdoor heat exchanger, and a throttling device 100 is connected between the indoor heat exchanger and the outdoor heat exchanger to throttle the refrigerant flowing through them. Of course, the throttling device 100 can also be installed between other components of the air conditioning system that require throttling.

[0099] According to the embodiment of the present utility model, since the throttling device 100 is relatively easy to manufacture, the air conditioning system using the throttling device 100 is also relatively easy to process and manufacture, which facilitates the improvement of the manufacturing efficiency of the air conditioning system.

[0100] Please refer to Figure 6 In some embodiments, the air conditioning system further includes a connecting pipe 7, with the first interface pipe 21 and the second interface pipe 22 respectively connected to the connecting pipe 7. The flow area of ​​the connecting pipe 7 is greater than the flow area of ​​the throttling pipe section 23, and the connecting pipe 7 does not throttle the refrigerant flowing through it.

[0101] Wherein, the connecting pipe 7 connected to at least one of the first interface pipe 21 and the second interface pipe 22 (one or both of the first interface pipe 21 and the second interface pipe 22 having a throttling section 23) is a pre-designed pipe, and at least one of the first interface pipe 21 and the second interface pipe 22 is inserted into the constricted pipe section 71 at the end of the corresponding pre-designed pipe, and the outer diameter of the portion of the pre-designed pipe other than the constricted pipe section 71 is greater than or equal to 5 mm; and / or, please refer to Figure 7At least one of the first interface pipe 21 and the second interface pipe 22 is connected to a third filter element 33 between itself and the corresponding connecting pipe 7.

[0102] For example, if the first interface pipe 21 has a throttling section 23 and the second interface pipe 22 does not have a throttling section 23, then the connecting pipe 7 connected to the first interface pipe 21 is a pre-designed pipe, and the connecting pipe 7 connected to the second interface pipe 22 is not a pre-designed pipe. The first interface pipe 21 is inserted into the constricted section 71 of the pre-designed pipe. Alternatively, if the second interface pipe 22 has a throttling section 23 and the first interface pipe 21 does not have a throttling section 23, then the connecting pipe 7 connected to the second interface pipe 22 is a pre-designed pipe, and the connecting pipe 7 connected to the first interface pipe 21 is not a pre-designed pipe. The second interface pipe 22 is inserted into the constricted section 71 of the pre-designed pipe. Or, if the first interface pipe 21 and the second interface pipe 22 each have a throttling section 23, and the connecting pipes 7 connected to both the first interface pipe 21 and the second interface pipe 22 are both pre-designed pipes, then the first interface pipe 21 and the second interface pipe 22 are respectively inserted into the constricted section 71 of the corresponding pre-designed pipe.

[0103] The flow area of ​​the connecting pipe 7 is greater than the flow area of ​​the throttling pipe section 23. For example, the outer diameter of the portion of the preset pipe except for the constricted pipe section 71 is greater than or equal to 5 mm, and the outer diameter of the throttling pipe section 23 is less than or equal to 4.8 mm. This allows the refrigerant flowing from the preset pipe section to the throttling pipe section 23 to achieve a better throttling effect, thereby reducing the pressure of the refrigerant flowing into the throttling device 100 and improving the refrigerant noise during the operation of the throttling device 100. At the same time, by setting the constricted pipe section 71, the pipe diameter of the first interface pipe 21 and / or the second interface pipe 22 is more compatible with the pipe diameter of the preset pipe section, making the assembly of the first interface pipe 21 and / or the second interface pipe 22 with the corresponding preset pipe more convenient. For example, the first interface pipe 21 and / or the second interface pipe 22 can be fixed to the corresponding preset pipe section by welding, which facilitates the improvement of the assembly efficiency of the air conditioning system.

[0104] For example, the outer diameter of the pre-installed piping, excluding the constricted section 71, is 6mm or 6.35mm. The pipe diameter of common pipes in air conditioning systems is also 6mm or 6.35mm, which is conducive to the standardized design of pipes in air conditioning systems and reduces maintenance difficulty.

[0105] At least one of the first interface pipe 21 and the second interface pipe 22 is connected to the corresponding connecting pipe 7 with a third filter element 33, including: Example 1, the first interface pipe 21 is connected to the corresponding connecting pipe 7 with a third filter element 33, but the second interface pipe 22 is not connected to the corresponding connecting pipe 7 with a third filter element 33; Example 2, the second interface pipe 22 is connected to the corresponding connecting pipe 7 with a third filter element 33, but the first interface pipe 21 is not connected to the corresponding connecting pipe 7 with a third filter element 33; Example 3, both the first interface pipe 21 and the second interface pipe 22 are connected to the corresponding connecting pipe 7 with a third filter element 33.

[0106] By providing a third filter 33, the refrigerant flowing through the connecting pipe 7 to the first interface pipe 21 and / or the second interface pipe 22 can be filtered by the third filter 33. This ensures that the refrigerant flowing to the throttling device 100 is purer, reducing the likelihood of impurities in the refrigerant flow coming into contact with the throttling device 100. The throttling device 100 is less susceptible to blockages and wear due to impurities, thus enabling it to provide a more stable throttling effect on the refrigerant flowing through it, thereby improving the reliability of the air conditioning system. It is understood that the provision of the third filter 33 is not directly related to the provision of the throttling pipe section 23. That is, regardless of whether either the first interface pipe 21 or the second interface pipe 22 has a throttling pipe section 23, or whether both have a throttling pipe section 23, at least one of the first interface pipe 21 and the second interface pipe 22 can be connected to the third filter 33.

[0107] Please refer to Figure 7 In some embodiments, the third filter element 33 may include a connecting pipe and a filter element. The filter element is disposed inside the connecting pipe. The connecting pipe includes a constriction portion 331, which is located at both ends of the connecting pipe. One end of the constriction portion 331 is connected to the connecting pipe 7, and the other end of the constriction portion 331 is connected to the first interface pipe 21 and / or the second interface pipe 22. By providing the constriction portion 331, the size of the third filter element 33 can be better matched with the pipe diameter of the first interface pipe 21 and / or the second interface pipe 22. At the same time, the size of the third filter element 33 can be better matched with the pipe diameter of the connecting pipe 7, which facilitates the improvement of the installation efficiency of the third filter element 33.

[0108] Furthermore, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately. In addition, various different embodiments of this application can also be arbitrarily combined, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.

[0109] In the description of this utility model, it should be understood that the terms "center," "lateral," "length," "thickness," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0110] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A throttling device, characterized in that include: The valve body has a flow channel cavity inside, and the flow channel cavity has a valve port for throttling. A first interface pipe and a second interface pipe, wherein the first interface pipe is disposed on the valve body and communicates with the flow channel cavity, and the second interface pipe is disposed on the valve body and communicates with the flow channel cavity, wherein one of the first interface pipe and the second interface pipe is adapted to be disposed on the upstream side of the valve port and the other is adapted to be disposed on the downstream side of the valve port, and at least one of the first interface pipe and the second interface pipe has a throttling pipe section.

2. The throttling device according to claim 1, characterized in that, The length of the throttling pipe section is greater than or equal to twice the outer diameter of the throttling pipe section; and / or, The outer diameter of the throttling pipe section is less than or equal to 4.8 mm.

3. The throttling device according to claim 1, characterized in that, The flow area of the throttle pipe section is S, 10mm 2 ≤ S ≤ 14mm 2 ; and / or, The inner diameter of the throttling pipe section is d, where 3.6 mm ≤ d ≤ 4.2 mm.

4. The throttling device according to claim 1, characterized in that, At least one of the first interface tube and the second interface tube is configured as a capillary.

5. The throttling device according to claim 1, characterized in that, The valve body has a first mounting port and a second mounting port, the first interface tube is inserted into the first mounting port, and the second interface tube is inserted into the second mounting port.

6. The throttling device according to claim 1, characterized in that, Also includes: The first filter element is disposed in the flow channel cavity and is located between the first interface pipe and the valve port. And / or, The second filter element is disposed within the flow channel cavity, located between the second interface pipe and the valve port.

7. The throttling device according to claim 6, characterized in that, The valve port divides the flow channel cavity into a first chamber and a second chamber. The first interface pipe is connected to the first chamber, and the second interface pipe is connected to the second chamber. The first chamber contains the first filter element, which is formed into a cylindrical structure with its axial ends respectively engaging with the corresponding cavity walls of the first chamber. The first interface pipe is located on the peripheral cavity wall of the first chamber and is opposite to the first filter element; and / or, The second chamber is provided with the second filter element, the edge of the second filter element is engaged with the peripheral wall of the second chamber, and the second filter element protrudes toward the second interface tube.

8. The throttling device according to any one of claims 1-7, characterized in that, The valve body also has a mounting cavity, and the throttling device further includes: A valve core is movably disposed in the mounting cavity. One end of the valve core extends out of the mounting cavity and into the flow channel cavity. The portion of the valve core extending into the flow channel cavity has a valve needle portion that mates with the valve port portion. The outer perimeter of the valve needle portion varies along the axial direction. A drive structure is disposed on the valve body and cooperates with the valve core to drive the valve core to move axially.

9. The throttling device according to claim 8, characterized in that, The driving structure includes: An electromagnetic coil, wherein the electromagnetic coil is sleeved outside the valve body; A magnetic rotor, wherein the magnetic rotor is disposed within the mounting cavity and cooperates with the electromagnetic coil; A screw, which passes through the magnetic rotor and is threadedly engaged with the magnetic rotor, and is connected to the valve core.

10. The throttling device according to claim 9, characterized in that, An elastic element is connected between the screw and the valve core, and the elastic element is used to apply an elastic force that moves the screw and the valve core away from each other.

11. The throttling device according to claim 10, characterized in that, A portion of the valve core passes through the magnetic rotor. The end of the valve core away from the valve needle portion has a first limiting portion. A second limiting portion is formed on the inner peripheral wall of the magnetic rotor. The second limiting portion is adapted to stop on the side of the first limiting portion facing the valve needle portion.

12. The throttling device according to claim 8, characterized in that, Also includes: A sleeve is disposed within the flow channel cavity and sleeved over the portion of the valve core that extends into the flow channel cavity. The sleeve is located between the valve port and the first interface pipe to divide the space between the valve port and the first interface pipe into an inner cavity and an outer cavity. The inner cavity communicates with the valve port, and the outer cavity communicates with the first interface pipe. An overflow hole is formed on the sleeve to communicate between the inner cavity and the outer cavity.

13. The throttling device according to claim 12, characterized in that, The overflow hole is axially offset from the first interface pipe; and / or, The overflow holes are multiple and spaced apart circumferentially.

14. The throttling device according to claim 8, characterized in that, The valve body includes: A first valve housing, wherein the first valve housing has the mounting cavity; The second valve housing is connected to one end of the first valve housing, and the first interface pipe is disposed on the second valve housing; A third valve housing is connected to the end of the second valve housing away from the first valve housing, and together with the second valve housing, defines the flow channel cavity. The second interface pipe is disposed on the third valve housing, and the valve port is located between the second valve housing and the third valve housing.

15. An air conditioning system, characterized in that, Includes the throttling device according to any one of claims 1-14.

16. The air conditioning system according to claim 15, characterized in that, It also includes connecting pipes, wherein the first interface pipe and the second interface pipe are respectively connected to connecting pipes, and the flow area of ​​the connecting pipes is larger than the flow area of ​​the throttling pipe section. The connecting pipe connected to at least one of the first interface pipe and the second interface pipe is a pre-designed pipe, and at least one of the first interface pipe and the second interface pipe is inserted into a constricted pipe section at the end of the corresponding pre-designed pipe, wherein the outer diameter of the portion of the pre-designed pipe excluding the constricted pipe section is greater than or equal to 5 mm; and / or, At least one of the first interface pipe and the second interface pipe is connected to a third filter element between itself and the corresponding connecting pipe.

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