Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve which comprises a valve body provided with a communicating cavity, a first connector and a second connector which are oppositely arranged, a valve port is formed between the first connector and the second connector, and the valve port is communicated with the first connector and the second connector. The valve needle is movably arranged in the communicating cavity, and the valve needle can move relative to the valve port so as to adjust the flow at the valve port; the extended flow channel is arranged between the valve port and the second interface; the silencing part is arranged at the first connector and / or the second connector, and the silencing part is a porous part. According to the technical scheme, the problem that in the prior art, an electronic expansion valve is prone to noise when used can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to control valve technical field, specifically, relate to an electronic expansion valve. BACKGROUND

[0002] At present, electronic expansion valve is usually used to adjust fluid flow.

[0003] In the prior art, the electronic expansion valve usually adjusts the flow of refrigerant by cooperating the valve needle with the valve port, and the refrigerant fluid may be in a two-phase state of liquid phase and gas phase before and after flowing through the valve port in the system, so that there may be uneven and discontinuous bubbles in the refrigerant fluid. When the refrigerant fluid passes through the electronic expansion valve, discontinuous noise is easily generated, which affects the user experience. SUMMARY

[0004] The utility model provides an electronic expansion valve to solve the problem of noise in the prior art electronic expansion valve.

[0005] The utility model provides an electronic expansion valve, electronic expansion valve includes: valve body has intercommunication chamber, valve body has opposite first interface and second interface, first interface and second interface have valve port between, valve port respectively with first interface and second interface intercommunication;Valve needle, movably arranged in intercommunication chamber, valve needle can move relative to valve port, to adjust the flow at valve port;Extension flow channel, set between valve port and second interface;Silencer, set at first interface and / or second interface, silencer includes at least one sound absorbing block, sound absorbing block is porous piece;Wherein, the diameter of sound absorbing block is D5, 8mm >= D5 >= 5mm, the length of extension flow channel along the axial direction is L3, 10mm >= L3 >= 2.5mm.

[0006] Further, the silencer and the valve body are riveted and fixed.

[0007] Further, the second interface includes a spacing section and a mounting section that are in communication with each other, the inner diameter of the spacing section is greater than the inner diameter of the extension flow channel, when the silencer is arranged at the second interface, the silencer is located in the mounting section, and the spacing section is located between the mounting section and the extension flow channel.

[0008] Further, the inner diameter of the spacing section is less than the inner diameter of the mounting section, a stepped surface is formed between the spacing section and the mounting section, and the silencer abuts against the stepped surface.

[0009] Further, the inner diameter of the spacing section is D1, the inner diameter of the mounting section is D2, and D2-D1 >= 0.4mm.

[0010] Further, the length of the spacing section along the axial direction is L1, 4mm >= L1 >= 0.2mm, and / or the length of the mounting section along the axial direction is L2, L2 >= 1.5mm.

[0011] Further, the length of the extension flow channel in the axial direction is L3, and the diameter of the valve port is D3; wherein, L3≥0.5D3; and / or, 4mm≥D3≥1mm.

[0012] Further, the sound attenuation block is provided with at least two flow-through holes.

[0013] Further, the total flow-through area of the flow-through holes is greater than the flow-through area of the valve port.

[0014] Further, the diameter of the flow-through holes is D4, and 1.5mm≥D4≥0.5mm.

[0015] Further, the porosity of the sound attenuation block is between 30%-90%.

[0016] Further, the length of the sound attenuation block in the axial direction is L4, and 10mm≥L4≥0.3mm.

[0017] Further, the flow-through area of the valve port is S1, the axial projection area of the sound attenuation block is S2, and 6≥S2 / S1≥1.

[0018] Further, the valve body is an integrally formed structure.

[0019] The technical scheme of the present application can solve the problem of large supercooling degree of the refrigerant before flowing through the valve port when the electronic expansion valve is at a small opening degree by setting the sound attenuation member; and can solve the problem of insufficient supercooling degree before the valve when the refrigerant flows in the second direction by setting the extension flow channel. By simultaneously setting the extension flow channel and the sound attenuation member, the noise problem when the refrigerant flows in two different directions can be solved, the fluid can be rectified, the turbulence of the fluid can be reduced, the large bubbles in the refrigerant fluid can be finely decomposed, and the noise of the refrigerant fluid flowing through the electronic expansion valve can be comprehensively reduced, so as to improve the applicability of the electronic expansion valve and improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the present application. The use of the same reference numerals in different drawings indicates similar or identical components.

[0021] Figure 1 Fig. 1 shows a structure schematic diagram of an electronic expansion valve provided by the present application;

[0022] Figure 2 Fig. 2 shows a structure schematic diagram of a valve body provided by the present application;

[0023] Figure 3 Fig. 3 shows a structure schematic diagram of a sound attenuation block provided by the present application; Figure 2 Fig. 4 shows an enlarged view of part A in Fig. 3;

[0024] Figure 4 A top view of the silencing component provided by this utility model is shown;

[0025] Figure 5 A cross-sectional view of the silencing component provided by this utility model is shown.

[0026] The above figures include the following reference numerals:

[0027] 01. First takeover; 02. Second takeover;

[0028] 100. Valve body; 101. Connecting cavity;

[0029] 110. First interface; 120. Second interface; 121. Spacing section; 122. Mounting section; 130. Valve port;

[0030] 200. Valve needle;

[0031] 300. Extend the flow channel;

[0032] 400. Silencing component; 410. Flow hole. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] like Figure 1 and Figure 2The utility model discloses an electronic expansion valve, electronic expansion valve includes valve body 100, valve needle 200, extension flow channel 300 and silencer 400. Among them, valve body 100 has the communication chamber 101, valve body 100 has the first interface 110 with second interface 120 of opposite arrangement, and the valve port 130 between the first interface 110 with second interface 120 has, and the valve port 130 is communicated with first interface 110 and second interface 120 respectively, and the first interface is arranged on the lateral wall of valve body 100, and the second interface is arranged at the end of valve body 100. Electronic expansion valve still has first pipe 01 with second pipe 02, and first pipe 01 with second pipe 02 are used to connect electronic expansion valve into system, and first pipe 01 is communicated with first interface 110, and second pipe 02 is communicated with second interface 120. Valve needle 200 is movably arranged in the communication chamber 101, and valve needle 200 can move relative to valve port 130 to adjust the flow of valve port 130, realize the flow regulation function of electronic expansion valve.

[0035] Specifically, extension flow channel 300 is arranged between valve port 130 and second interface 120, has the effect of straightening to fluid, reduces turbulence, plays a certain noise reduction effect, and can throttle and depressurize refrigerant, reduce the flow rate of refrigerant, reduce the risk of bubble rupture in refrigerant, further reduce noise. Meanwhile, silencer 400 is a porous piece, specifically can be a multilayer stainless steel mesh sintered filter screen, and silencer 400 can be arranged at first interface 110 or second interface 120 alone, or can be arranged at first interface 110 and second interface 120 simultaneously, can refine large bubbles in two-phase fluid into small bubbles, comb large bubbles, and reduce the sound of large bubble annihilation.

[0036] If only silencer 400 is arranged, fluid will have turbulence phenomenon, and fluid flow stability is poor, and bubble rupture risk is large, if only extension flow channel 300 is arranged, then the rupture of large bubbles in refrigerant flow can produce noise.

[0037] Specifically, in the electronic expansion valve provided in the application, the fluid direction can be from first pipe 01 to second pipe 02, or from second pipe 02 to first pipe 01, for the convenience of description, the application sets that when the flow direction of refrigerant fluid is from first pipe 01 to second pipe 02, the flow direction of refrigerant fluid is the first direction, and when the flow direction of refrigerant fluid is from second pipe 02 to first pipe 01, the flow direction of refrigerant fluid is the second direction.

[0038] In some possible embodiments of the present application, the sound attenuation piece 400 can be arranged at the second interface 120, so that when the refrigerant flows in the first direction, the refrigerant fluid first passes through the throttling of the valve port 130, then flows to the extended flow channel 300, and then passes through the sound attenuation piece 400. When the refrigerant changes direction and flows in the second direction, the refrigerant fluid first passes through the sound attenuation piece 400, then enters the extended flow channel 300 for rectification, and then passes through the valve port. By simultaneously arranging the extended flow channel 300 and the sound attenuation piece 400, the noise problem of the refrigerant fluid flowing in two different directions can be solved, the fluid can be rectified, the turbulence of the fluid can be reduced, the large bubbles in the refrigerant fluid can be finely broken down, and the noise of the refrigerant fluid flowing through the electronic expansion valve can be comprehensively reduced, so as to improve the applicability of the electronic expansion valve and improve the user experience.

[0039] Specifically, the diameter of the sound attenuation block is D5, and 8mm≥D5≥5mm. When the diameter D5 of the sound attenuation block is less than 5mm, the diameter of the sound attenuation block is small, the efficiency of the sound attenuation block in combing the bubbles in the fluid is low, and the thickness of the sound attenuation block needs to be increased, which affects the flow efficiency of the fluid. When the diameter D5 of the sound attenuation block is greater than 8mm, the diameter of the sound attenuation block is too large, and the fluid will generate a large pressure drop when passing through the sound attenuation block, and a large kinetic energy is lost. By setting 8mm≥D5≥5mm, the sound attenuation block can provide a noise reduction effect while ensuring the flow efficiency of the fluid. Specifically, D5 can be 5mm, 6mm, 7mm or 8mm.

[0040] Meanwhile, 10mm≥L3≥2.5mm can be set. By setting the length of the extended flow channel 300 to be between 10mm and 2.5mm, the length of the extended flow channel 300 can be ensured, the extended flow channel 300 will not be too short, the rectification effect and the throttling and pressure reduction effect of the extended flow channel 300 can be ensured, and the extended flow channel 300 will not be too long, which prevents difficult processing. Specifically, L3 can be 2.5mm, 3mm, 5mm, 8mm or 10mm.

[0041] In summary, by simultaneously setting the diameter of the sound attenuation piece 400 to be between 5mm and 8mm and the length of the extended flow channel 300 to be between 2.5mm and 10mm, the extended flow channel 300 and the sound attenuation piece 400 can have a relatively optimal noise reduction effect, and the extended flow channel 300 and the sound attenuation piece 400 can cooperate to solve the noise problem of the electronic expansion valve in the case of bidirectional fluid flow, thereby improving the user experience.

[0042] Specifically, in the present application, the sound attenuation piece 400 and the valve body 100 are fixed by riveting, without the need for additionally arranging a fixing piece, so as to reduce the processing difficulty of the valve body 100 and reduce the production cost.

[0043] As shown in the figure, the second interface 120 includes an interconnected partition section 121 and an installation section 122. The inner diameter of the partition section 121 is larger than the inner diameter of the extension channel 300. When the silencer 400 is installed at the second interface 120, the silencer 400 is located within the installation section 122, and the partition section 121 is located between the installation section 122 and the extension channel 300. Because the inner diameter of the partition section 121 is larger than the inner diameter of the extension channel 300, the partition section 121 can expand the flow range of the refrigerant and ensure the flow efficiency of the refrigerant. At the same time, the partition section 121 can provide a buffer for the silencer 400 and the extension channel 300. When the fluid flows in the first direction, after the fluid flows out of the extension channel 300, the refrigerant velocity decreases and the kinetic energy decreases. The partition section 121 can further buffer and decelerate the refrigerant, further reducing the kinetic energy of the refrigerant when it impacts the silencer 400, and improving the noise reduction effect.

[0044] Specifically, the side wall of the valve body 100 at the mounting section 122 can be partially machined to a thinner size. After the silencer 400 is installed in the mounting section 122, the side wall of the valve body 100 at the mounting section 122 can be riveted inward to achieve the riveting and fixing of the silencer 400.

[0045] Furthermore, the inner diameter of the partition section 121 is smaller than the inner diameter of the mounting section 122, and a stepped surface is formed between the partition section 121 and the mounting section 122. The silencer 400 abuts against the stepped surface to restrict the movement of the silencer 400 towards the valve port 130. It cooperates with the riveting of the valve body 100 to prevent the silencer 400 from loosening or even falling off due to refrigerant scouring under the condition of bidirectional refrigerant flow, thus ensuring the stability of the silencer 400 installation.

[0046] Similarly, in other embodiments of this application, a similar riveting and limiting structure may also be provided at the first interface 110.

[0047] like Figure 3 As shown, the inner diameter of the interval section 121 is D1, and the inner diameter of the mounting section 122 is D2, where D2-D1 ≥ 0.4mm. When D2-D1 < 0.4mm, the difference between the inner diameters of the interval section 121 and the mounting section 122 is too small, resulting in a small stepped surface area. This leads to poor limiting effect of the stepped surface on the silencer 400. If the silencer 400 is subjected to excessive refrigerant impact or improper valve machining, it may shift or even detach, affecting the noise reduction effect of the electronic expansion valve. This application improves the installation stability of the silencer 400 by setting D2-D1 ≥ 0.4mm, ensuring stable operation. Specifically, D2-D1 can be selected as 0.4mm, 0.6mm, or 0.8mm, etc., and can be adjusted according to the design dimensions of the valve body 100.

[0048] Specifically, the length of the spacing section 121 along the axial direction is L1, and 4 mm≥L1≥0.2 mm. When L1 is less than 0.2 mm, the length of the spacing section 121 is too short to effectively buffer the fluid, and the kinetic energy of the refrigerant is too large; when L1 is greater than 4 mm, the length of the spacing section 121 is excessively long, which increases the volume of the valve body 100, increases the processing difficulty of the valve body 100, and increases the manufacturing cost. In the present application, by setting 4 mm≥L1≥0.2 mm, the working effect of the spacing section 121 can be ensured while miniaturizing the valve body 100. Specifically, L1 can be selected as 4 mm, 3 mm, 1 mm or 0.2 mm.

[0049] Further, the length of the mounting section 122 along the axial direction is L2, and L2≥1.5 mm. Because the sound-damping piece 400 has a certain thickness, the mounting section 122 also needs a certain length to accommodate the sound-damping piece 400, and the mounting section 122 needs to ensure a certain length for riveting work. If L2 is less than 1.5 mm, the length of the mounting section 122 is insufficient, and the mounting requirement of the sound-damping piece 400 cannot be met. By setting L2≥1.5 mm in the present application, the stable installation of the sound-damping piece 400 can be ensured. Specifically, L2 can be set as 1.5 mm, 2.0 mm, 2.5 mm, 4 mm or 5 mm, etc.

[0050] In the present application, the length of the extended flow channel 300 along the axial direction is L3, the diameter of the valve port 130 is D3, and L3≥0.5D3. When the length of the extended flow channel 300 is less than 0.5D3, the length of the extended flow channel 300 is too small, the rectification effect of the extended flow channel 300 on the refrigerant fluid is poor, and the refrigerant still has a large turbulent flow after flowing out of the extended flow channel 300, which has a poor noise reduction effect. By setting L3≥0.5D3 in the present application, the extended flow channel 300 can ensure a certain length to make the refrigerant flow out after rectification. Specifically, L3 can be set as 0.5D3, D3, 1.5D3, 2D3.

[0051] Further, in the present application, 4 mm≥D3≥1 mm can also be set. In this way, the diameter of the valve port 130 will not be too large or too small, which can make the valve port 130 adapt to the extended flow channel 300, control the flow efficiency of the fluid, make the throttled fluid fully rectified in the extended flow channel 300, and improve the noise reduction effect of the extended flow channel 300. Specifically, D3 can be set as 1 mm, 2 mm, 3 mm or 4 mm.

[0052] In the present application, the sound attenuation block is provided with at least two flow holes 410. In this way, the sound attenuation block can filter large bubbles in the two-phase flow into small bubbles, reduce the sound of large bubble annihilation, reduce the working noise of the electronic expansion valve, the flow holes can enable the liquid refrigerant to pass through the sound attenuation block smoothly, reduce the flow resistance of the sound attenuation block, avoid the complete blockage of the porous structure on the sound attenuation block by impurities in the refrigerant, and ensure the flow capacity of the electronic expansion valve. At the same time, when the porous structure on the sound attenuation block is dirty and blocked, when the refrigerant flow direction in the system changes, the refrigerant fluid can reverse flush the sound attenuation block, flush out the impurities attached to the sound attenuation block, and clean the sound attenuation block.

[0053] Referring to the drawings, the sound attenuation block provided in the embodiments of the present application is provided with one, and the flow holes 410 are provided with four, which are annularly and spacedly arranged around the axis of the sound attenuation block.

[0054] In other feasible embodiments of the present application, the sound attenuation block can be provided with a plurality, such as two or three, etc. The plurality of sound attenuation blocks are spacedly arranged, and the flow holes 410 on the plurality of sound attenuation blocks do not completely correspond. While ensuring the flow capacity of the fluid, the fluid can also be sufficiently filtered and the bubbles in the fluid can be refined, thereby improving the noise reduction effect of the sound attenuation member 400.

[0055] Specifically, the total flow area of the flow holes 410 is greater than the flow area of the valve port 130, so that the sound attenuation block does not throttle the fluid when the fluid flows through the sound attenuation block, and the flow efficiency of the fluid is ensured.

[0056] As shown in Figure 4 As shown in Figure 5 The diameter of the flow hole 410 is D4, and 1.5mm≥D4≥0.5mm. When the diameter of the flow hole 410 is less than 0.5mm, the diameter of the flow hole 410 is too small. In order to ensure that the total flow area of the flow hole 410 is greater than the flow area of the valve port 130, more flow holes 410 need to be provided, which is difficult to process. When the diameter of the flow hole 410 is greater than 1.5mm, the diameter of the flow hole is large, and more fluid will not flow through the porous filter screen part of the sound attenuation block when the fluid passes through the sound attenuation block, and the sound attenuation block has poor combing effect on the bubbles in the fluid. In the present application, by setting 1.5mm≥D4≥0.5mm, the noise reduction effect of the sound attenuation block can be ensured, and the processing difficulty of the sound attenuation block can be reduced. Specifically, D4 can be set to 0.5mm, 1mm or 1.5mm.

[0057] Similarly, the length of the sound attenuation block in the axial direction is L4, and 10mm≥L4≥0.3mm. When the length of L4 is less than 0.3mm, the length of L4 is too small, and the sound attenuation block has poor ability to comb bubbles. When the length of L4 is greater than 10mm, the length of L4 is too large, and the flow resistance of the fluid is large. In the present application, by setting 10mm≥L4≥0.3mm, the sound attenuation block can also ensure the flow efficiency of the fluid while providing the noise reduction effect. Specifically, L4 can be set to 0.3mm, 1mm, 3mm, 5mm, 7.5mm or 10mm.

[0058] In the present application, the porosity of the sound attenuation block is between 30%-90%. If the porosity of the sound attenuation block is greater than 90%, the flow resistance of the fluid is large, which affects the flow of the fluid. If the porosity of the sound attenuation block is less than 30%, the sound attenuation block has poor refining effect on bubbles, and the noise reduction effect of the sound attenuation block is poor. In the present application, by setting the porosity of the sound attenuation block to be between 30%-90%, the overall working effect of the sound attenuation block can be ensured. Specifically, the porosity of the sound attenuation block can be selected to be 30%, 50%, 70% or 90%, etc.

[0059] Specifically, the flow area of the valve port 130 is S1, and the projection area of the sound attenuation block in the axial direction is S2, and 6≥S2 / S1≥1. When the ratio of S2 to S1 is less than 1, the area of the sound attenuation block is small, and the refining effect of the sound attenuation block on bubbles cannot be ensured. When the ratio of S2 to S1 is greater than 6, the area of the sound attenuation block is too large, and the fluid has a large pressure drop and a large kinetic energy loss when flowing through the sound attenuation block, which affects the flow efficiency of the fluid. In the present application, by setting 6≥S2 / S1≥1, the flow effect of the fluid when flowing through the sound attenuation block can be ensured. Specifically, S2 / S1 can be selected to be 1, 2, 5 or 6, etc.

[0060] In some feasible embodiments of the present application, in order to improve the processing efficiency of the valve body 100, the valve body 100 can be provided in an integrated structure.

[0061] In some feasible embodiments of the present application, in order to finely process the structure of the extended flow channel 300, the valve body 100 can also be provided in a split form, i.e., the extended flow channel 300 and the valve body 100 are provided in a split form, and the two are fixedly connected.

[0062] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0063] The foregoing description, for purposes of explanation, sets forth specific values and arrangements of components and steps that are subject to many options. It is their functions, equivalents, and combinations thereof, that are intended to be abidingly abstracted. In the claims, means-plus-function clauses, if used, are intended to cover structures described herein as performing the recited functions and not only structural equivalents but also equivalent structures. Although the numerical expressions used herein drop out any decimal point, the numerical values actually used in the calculations are typically expressed in decimal form. The numerical values used in the examples are intended to be illustrative only and are not intended to limit the scope of the application. Other examples of the illustrative embodiments can have different values. It is to be understood that the foregoing description and specific examples are intended to explain and not to limit the scope of the application, which is defined by the scope of the appended claims, including all equivalents thereof.

[0064] In the description of the present application, it needs to be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0065] For the convenience of description, spatial relative terms such as "above", "upper", "on", "upper surface", "upper", and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "above" other devices or structures will be positioned "below" or "below" other devices or structures. Thus, the example term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used herein is interpreted accordingly.

[0066] In addition, it needs to be explained that the use of "first", "second" and the like to limit the parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the protection scope of the present application.

[0067] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electronic expansion valve characterized by, The electronic expansion valve comprises: a valve body (100) having a communication cavity (101), the valve body (100) having a first interface (110) and a second interface (120) oppositely arranged, the first interface (110) and the second interface (120) having a valve port (130) therebetween, the valve port (130) being in communication with the first interface (110) and the second interface (120) respectively; a valve needle (200) movably arranged in the communication cavity (101), the valve needle (200) being movable relative to the valve port (130) to adjust the flow at the valve port (130); an extended flow channel (300) arranged between the valve port (130) and the second interface (120); a sound attenuation member (400) arranged at the first interface (110) and / or the second interface (120), the sound attenuation member (400) comprising at least one sound attenuation block, the sound attenuation block being a porous member; wherein a diameter of the sound attenuation block is D5, 8mm≥D5≥5mm, and an axial length of the extended flow channel (300) is L3, 10mm≥L3≥2.5mm.

2. The electronic expansion valve according to claim 1, characterized in that The sound attenuation member (400) is riveted to the valve body (100).

3. The electronic expansion valve according to claim 1, wherein The second interface (120) comprises a spacing section (121) and a mounting section (122) in communication with each other, an inner diameter of the spacing section (121) is greater than an inner diameter of the extended flow channel (300), when the sound attenuation member (400) is arranged at the second interface (120), the sound attenuation member (400) is located in the mounting section (122), and the spacing section (121) is located between the mounting section (122) and the extended flow channel (300).

4. The electronic expansion valve according to claim 3, characterized in that An inner diameter of the spacing section (121) is less than an inner diameter of the mounting section (122), a stepped surface is formed between the spacing section (121) and the mounting section (122), and the sound attenuation member (400) abuts against the stepped surface.

5. The electronic expansion valve according to claim 3, wherein The inner diameter of the spacing section (121) is D1, the inner diameter of the mounting section (122) is D2, and D2-D1≥0.4mm.

6. The electronic expansion valve according to claim 3, wherein An axial length of the spacing section (121) is L1, 4mm≥L1≥0.2mm, and / or an axial length of the mounting section (122) is L2, L2≥1.5mm.

7. The electronic expansion valve according to claim 1, wherein: an axial length of the extended flow channel (300) is L3, and a diameter of the valve port (130) is D3; wherein L3≥0.5D3; and / or, 4mm≥D3≥1mm.

8. The electronic expansion valve according to claim 1, wherein At least two flow-through holes (410) are arranged on the sound attenuation block.

9. The electronic expansion valve according to claim 8, characterized in that A total flow-through area of the flow-through holes (410) is greater than a flow-through area of the valve port (130).

10. The electronic expansion valve according to claim 8, wherein A diameter of the flow-through holes (410) is D4, 1.5mm≥D4≥0.5mm.

11. The electronic expansion valve according to claim 8, wherein A porosity of the sound attenuation block is between 30% and 90%.

12. The electronic expansion valve of claim 8, wherein, An axial length of the sound attenuation block is L4, 10mm≥L4≥0.3mm.

13. The electronic expansion valve of claim 8, wherein, The flow area of the valve port (130) is S1, the projection area of the sound attenuation block in the axial direction is S2, and 6≥S2 / S1≥1.

14. The electronic expansion valve of claim 1, wherein, The valve body (100) is an integral molding structure.

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