Electronic expansion valve, refrigerant circulation piping and air conditioning system

Abstract

This invention discloses an electronic expansion valve, a refrigerant circulation pipeline, and an air conditioning system. The electronic expansion valve includes a valve seat and a valve needle assembly. The valve seat forms a main valve cavity, and the valve needle assembly includes a valve needle sleeve fitted inside the main valve cavity. The valve needle sleeve has a needle sleeve cavity, and a main valve port is formed on one end wall of the needle sleeve cavity. The main valve port includes a first guide hole section, a second guide hole section, and a rectifier hole section. The rectifier hole section is connected to the first guide hole section, and the diameter of the rectifier hole section is larger than the diameter of the first guide hole section, so that the inner wall surfaces of the rectifier hole section and the first guide hole section are stepped. When the electronic expansion valve is working, when the refrigerant flows through the rectifier hole section, turbulence is locally formed at the corresponding step in the rectifier hole section. At this time, the turbulence guides the refrigerant flow through the middle position of the main valve port, playing a flexible guiding role, improving the flow state of the refrigerant at the main valve port, and effectively reducing refrigerant noise.

Description

Technical Field

[0001] This invention relates to the field of electronic expansion valve technology, and particularly to an electronic expansion valve, a refrigerant circulation pipeline, and an air conditioning system. Background Technology

[0002] Currently, electronic expansion valves produce a strong refrigerant noise during use. Air conditioner manufacturers typically need to add transition tubes or capillary tubes before and after throttling when using such electronic expansion valves. On the one hand, the noise reduction effect is not obvious and it is not universal. On the other hand, it increases the complexity of the pipeline, increases the pipeline space, increases the number of welding points, and increases the risk of leakage. In addition, it will lead to reduced production efficiency and increased manufacturing costs. Therefore, it is necessary to optimize the structure of electronic expansion valves. Summary of the Invention

[0003] The main objective of this invention is to propose an electronic expansion valve, a refrigerant circulation pipeline, and an air conditioning system, aiming to optimize the structure of the electronic expansion valve to improve the refrigerant noise of the electronic expansion valve.

[0004] To achieve the above objectives, the present invention provides an electronic expansion valve, comprising:

[0005] Valve seat, having formed a main valve chamber; and,

[0006] A valve needle assembly includes a valve needle sleeve fitted inside the main valve cavity. The valve needle sleeve has a needle sleeve cavity, and a main valve port is formed on one end wall of the needle sleeve cavity. The main valve port includes a first guide hole section, a second guide hole section, and a rectifying hole section located between the first guide hole section and the second guide hole section, distributed along a direction toward the outer end of the main valve port. The rectifying hole section is connected to the first guide hole section, and the diameter of the rectifying hole section is larger than the diameter of the first guide hole section, so that the inner wall surfaces of the rectifying hole section and the first guide hole section are stepped.

[0007] In one embodiment, the diameter of the first guide hole section is D, the diameter of the rectifying hole section is D1, and D1 / D≥2.

[0008] In one embodiment, the valve needle assembly further includes a valve needle disposed within the valve needle sleeve, wherein the tip of the valve needle is at least partially disposed within the main valve port, and the distance between the end face of the tip and the bottom wall surface of the sleeve cavity is L;

[0009] The length of the first guide hole section is L1, the length of the rectifying hole section is L2, the length of the second guide hole section is L3, and L1+L2+L3≤L≤1.5(L1+L2+L3).

[0010] In one embodiment, the end of the valve needle sleeve corresponding to the main valve port protrudes outside the main valve cavity to form a protruding portion;

[0011] The electronic expansion valve also includes a vertical connecting pipe, one end of which is sleeved onto the protruding part, and the inner diameter of the vertical connecting pipe is D. L ;

[0012] The inner diameter of the main valve port is D2, and 0.1 ≤ (D L -D2) / D2≤0.4.

[0013] In one embodiment, the aperture of the rectifier orifice is D1, and 0.65≤D1 / D2≤0.85.

[0014] In one embodiment, the outer surface of the protrusion is stepped, and in the direction toward the outer end of the main valve port, the protrusion includes a first protrusion section with a larger outer diameter and a second protrusion section with a smaller outer diameter connected in sequence.

[0015] The vertical pipe is sleeved to the first protruding section, and a liquid-holding gap is formed between the second protruding section and the vertical pipe.

[0016] In one embodiment, the inner diameter of the second guide hole section gradually increases in the direction toward the outer end of the main valve port, and the inner wall surface at the port of the second guide hole section is connected to the outer surface of the second protruding section.

[0017] In one embodiment, the length of the first protruding segment is L4, the length of the second protruding segment is L5, and 0.4≤L4 / L5≤0.85.

[0018] In one embodiment, the length of the rectifying orifice section is L2, the depth of the second guiding orifice section is L3, and 0.4≤(L2+L3) / (L4+L5)≤0.85.

[0019] In one embodiment, the inner wall of the needle sleeve cavity is provided with a main overflow hole that communicates with the main valve cavity.

[0020] In one embodiment, the electronic expansion valve further includes a transverse connecting pipe communicating with the main valve chamber, the transverse connecting pipe extending radially along the valve needle sleeve;

[0021] The main overflow hole is offset from the horizontal connecting pipe in the direction of the outer end of the main valve port.

[0022] In one embodiment, the centerline of the main overflow hole and the radial plane of the valve needle sleeve form an angle β, where 30°≤β≤60°.

[0023] In one embodiment, β = 45°.

[0024] In one embodiment, the inner diameter of the needle sheath cavity is D. S ;

[0025] The diameter of the main overflow orifice is d, and is 1.8 mm. <d<0.71D S .

[0026] In one embodiment, multiple main overflow holes are provided and spaced apart along the circumference of the main valve cavity.

[0027] In one embodiment, the valve needle assembly further includes a valve needle disposed within the valve needle sleeve. The valve needle includes a movable portion that is sealed and slidably mounted within the valve needle sleeve, and a needle tip portion that connects to the movable portion and is at least partially disposed within the main valve port. The movable portion has a covering section that at least partially covers the main overflow orifice. The movable portion is reduced in size at least at the covering section, so that an annular through cavity communicating with the main overflow orifice is formed between the covering section and the valve needle sleeve.

[0028] In one embodiment, the outer diameter of the covering segment is D. f2 The inner diameter of the needle sleeve cavity is D. S And 0.8 <D f2 / D S <0.98.

[0029] In one embodiment, the distance between the end face of the covering section away from the main valve port and the end face of the valve needle sleeve away from the main valve port is L. P And 0.8≤L p / D S ≤1.7.

[0030] In one embodiment, the valve needle assembly includes a valve needle sleeved within the needle sleeve cavity, the valve needle being adjustable along the length of the valve needle sleeve, and the tip of the valve needle being at least partially located within the main valve port.

[0031] The present invention also proposes a media circulation pipeline, the media circulation pipeline including an electronic expansion valve, the electronic expansion valve comprising:

[0032] Valve seat, having formed a main valve chamber; and,

[0033] A valve needle assembly includes a valve needle sleeve fitted inside the main valve cavity. The valve needle sleeve has a needle sleeve cavity, and a main valve port is formed on one end wall of the needle sleeve cavity. The main valve port includes a first guide hole section, a second guide hole section, and a rectifying hole section located between the first guide hole section and the second guide hole section, distributed along a direction toward the outer end of the main valve port. The rectifying hole section is connected to the first guide hole section, and the diameter of the rectifying hole section is larger than the diameter of the first guide hole section, so that the inner wall surfaces of the rectifying hole section and the first guide hole section are stepped.

[0034] The present invention also proposes an air conditioning system, the air conditioning system including a refrigerant circulation pipeline, the refrigerant circulation pipeline including an electronic expansion valve, the electronic expansion valve including:

[0035] Valve seat, having formed a main valve chamber; and,

[0036] A valve needle assembly includes a valve needle sleeve fitted inside the main valve cavity. The valve needle sleeve has a needle sleeve cavity, and a main valve port is formed on one end wall of the needle sleeve cavity. The main valve port includes a first guide hole section, a second guide hole section, and a rectifying hole section located between the first guide hole section and the second guide hole section, distributed along a direction toward the outer end of the main valve port. The rectifying hole section is connected to the first guide hole section, and the diameter of the rectifying hole section is larger than the diameter of the first guide hole section, so that the inner wall surfaces of the rectifying hole section and the first guide hole section are stepped.

[0037] In the technical solution provided by the present invention, the valve seat forms a main valve cavity, the valve needle sleeve is sleeved in the main valve cavity, and a main valve port is formed on one end wall of the needle sleeve cavity. The main valve port includes a first guide hole section, a second guide hole section, and a rectifying hole section located between the first guide hole section and the second guide hole section, distributed along the direction towards the outer end of the main valve port. The rectifying hole section and the inner wall surface of the first guide hole section are stepped. When the electronic expansion valve is working, when the refrigerant flows through the rectifying hole section, turbulence is locally formed in the rectifying hole section corresponding to the step. At this time, the turbulence guides the refrigerant flow through the middle position of the main valve port, playing a flexible guiding role, improving the flow state of the refrigerant at the main valve port, and effectively reducing refrigerant noise. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0039] Figure 1 A cross-sectional structural schematic diagram of the first embodiment of the electronic expansion valve provided by the present invention;

[0040] Figure 2 for Figure 1 A cross-sectional view of the assembly of the valve needle sleeve and the valve needle;

[0041] Figure 3 for Figure 1 A cross-sectional view of the valve needle sleeve;

[0042] Figure 4for Figure 1 A cross-sectional view of the valve needle;

[0043] Figure 5 A cross-sectional structural schematic diagram of a second embodiment of the electronic expansion valve provided by the present invention;

[0044] Figure 6 for Figure 5 A cross-sectional view of the assembly of the valve needle sleeve and the valve needle;

[0045] Figure 7 for Figure 5 A cross-sectional view of the valve needle sleeve;

[0046] Figure 8 for Figure 5 A cross-sectional view of the valve needle.

[0047] Explanation of icon numbers:

[0048]

[0049]

[0050] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0052] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0053] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0054] Currently, electronic expansion valves produce a strong refrigerant noise during use. Air conditioner manufacturers typically need to add transition tubes or capillary tubes before and after throttling when using such electronic expansion valves. On the one hand, the noise reduction effect is not obvious and it is not universal. On the other hand, it increases the complexity of the pipeline, increases the pipeline space, increases the number of welding points, and increases the risk of leakage. In addition, it will lead to reduced production efficiency and increased manufacturing costs. Therefore, it is necessary to optimize the structure of electronic expansion valves.

[0055] In view of this, the present invention proposes an electronic expansion valve, wherein, Figures 1 to 8 This is a schematic diagram of an embodiment of the electronic expansion valve provided by the present invention.

[0056] Please see Figures 1 to 4 The electronic expansion valve 100 includes a valve seat 1 and a valve needle assembly 2. The valve seat 1 forms a main valve cavity 11. The valve needle assembly 2 includes a valve needle sleeve 21 sleeved in the main valve cavity 11. The valve needle sleeve 21 has a needle sleeve cavity 211. One end wall of the needle sleeve cavity 211 forms a main valve port 212. The main valve port 212 includes a first guide hole section 2121, a second guide hole section 2122, and a rectifying hole section 2123 located between the first guide hole section 2121 and the second guide hole section 2122, distributed along the direction toward the outer end of the main valve port 212. The rectifying hole section 2123 is connected to the first guide hole section 2121. The diameter of the rectifying hole section 2123 is larger than the diameter of the first guide hole section 2121, so that the inner wall surface of the rectifying hole section 2123 and the first guide hole section 2121 are stepped.

[0057] In the technical solution provided by the present invention, the valve seat 1 forms a main valve cavity 11, the valve needle sleeve 21 is sleeved in the main valve cavity 11, and a main valve port 212 is formed on one end wall of the needle sleeve cavity 211. The main valve port 212 includes a first guide hole section 2121, a second guide hole section 2122, and a rectifying hole section 2123 located between the first guide hole section 2121 and the second guide hole section 2122, distributed along the direction toward the outer end of the main valve port 212. The inner wall of the rectifier orifice section 2123 and the first guide orifice section 2121 are stepped. When the electronic expansion valve 100 is working, when the refrigerant flows through the rectifier orifice section 2123, turbulence will be locally formed in the rectifier orifice section 2123 corresponding to the step. At this time, the turbulence will guide the refrigerant flow through the middle position of the main valve port 212, playing a flexible guiding role, improving the flow state of the refrigerant at the main valve port 212, and effectively reducing refrigerant noise.

[0058] It should be noted that the valve needle assembly 2 also includes a valve needle 22, the valve needle sleeve 21 is disposed in the needle sleeve cavity 211, the valve needle 22 is movable and adjustable along the length direction of the valve needle sleeve 21, and the needle tip 221 of the valve needle 22 is at least partially disposed in the main valve port 212. By controlling the movement of the valve needle 22 along the length direction of the valve needle sleeve 21, the gap between the needle sleeve cavity 211 and the main valve port 212 is adjusted, thereby connecting the main valve cavity 11 and the main valve port 212, and realizing the change of liquid pressure in the main valve cavity 11 and the main valve port 212.

[0059] In addition, the electronic expansion valve 100 also includes a drive mechanism for driving the valve needle 22. The drive mechanism includes a rotor structure, a stator structure, a threaded drive structure, and an anti-rotation structure. The above structures cooperate with each other to realize the movable adjustment of the valve needle 22 along the length direction of the valve needle sleeve 21. It should be noted that the drive mechanism is used in the prior art electronic expansion valve 100, and will not be described in detail here. In addition, the sealing structure inside the entire electronic expansion valve 100 is used in the prior art electronic expansion valve 100, and will not be described in detail here either.

[0060] In the flow path of the electronic expansion valve 100, liquid flows in or out from the side of the electronic expansion valve 100, corresponding to flowing out or in from the axial direction of the electronic expansion valve 100. In order to reduce refrigerant noise throughout the flow path, in the embodiments of the present invention, the relevant structures in the transverse flow path are improved, and the relevant structures in the vertical flow path are also improved.

[0061] The structural improvements to the vertical flow path mainly focus on optimizing the structure of the main valve port 212. For example, as mentioned above, a rectifier section 2123 is added between the first guide hole section 2121 and the second guide hole section 2122 to provide flexible flow guidance, improve the flow state of the refrigerant at the main valve port 212, and effectively reduce refrigerant noise. It should be noted that the number of rectifier sections 2123 is not limited; it can be one, two, or more.

[0062] The following description only uses a single rectifying orifice section 2123. The dimensional relationship between the various orifice sections of the main valve port 212 also affects the refrigerant noise. In one embodiment, the orifice diameter of the first guide orifice section 2121 is D, and the orifice diameter of the rectifying orifice section 2123 is D1, and D1 / D≥2. On the one hand, the flow of refrigerant must be fully considered, and on the other hand, a certain liquid guiding vortex ring needs to be formed at the corresponding step. Taking all the above factors into account, D1 / D≥2 can significantly reduce refrigerant noise and has a good effect.

[0063] The valve needle 22 restricts the inner profile of the fluid flowing in or out of the main valve port 212 at the middle position, and the inner wall of the main valve port 212 restricts the outer profile of the fluid flowing in or out of the main valve port 212 at the edge position. Both of these have a significant impact on the flow of refrigerant. In one embodiment, the valve needle assembly 2 further includes a valve needle 22 disposed within the valve needle sleeve 21, and the needle tip 221 of the valve needle 22 is at least partially disposed within the main valve port 212. The distance between the end face and the bottom wall of the needle sleeve cavity 211 is L, the length of the first guide hole section 2121 is L1, the length of the rectifying hole section 2123 is L2, the length of the second guide hole section 2122 is L3, and L1+L2+L3≤L≤1.5(L1+L2+L3). If the length of the needle tip 221 of the valve needle 22 is too short, it will not play a good guiding role. If the length of the needle tip 221 of the valve needle 22 is too long, it will increase the processing difficulty and increase the cost.

[0064] In one embodiment, the valve needle sleeve 21 protrudes from the end corresponding to the main valve port 212 outside the main valve cavity 11 to form a protrusion 213. The electronic expansion valve 100 also includes a vertical connecting pipe 3, one end of which is sleeved onto the protrusion 213. The inner diameter of the vertical connecting pipe 3 is D. L The inner diameter of the main valve port 212 is D2, and 0.1 ≤ (D L If the ratio -D2) / D2≤0.4, it is too small and will not have a guiding effect; if the ratio is too large, the guiding effect will be too strong, and a strong secondary flow will be formed before the second contraction guiding section. 0.1≤(D L-D2) / D2≤0.4 can play a good guiding role and reduce secondary flow, thus having a good guiding effect.

[0065] In one embodiment, the diameter of the rectifying orifice section 2123 is D1, and 0.65≤D1 / D2≤0.85. Within this range, the refrigerant flow between the second guide orifice section 2122 and the rectifying orifice section 2123 is stable.

[0066] Please see Figures 4 to 8 A schematic diagram of the structure of the second embodiment of the electronic expansion valve provided by the present invention. In this embodiment, the outer surface of the protrusion 213 is stepped. In the direction towards the outer end of the main valve port 212, the protrusion 213 includes a first protrusion section 2131 with a larger outer diameter and a second protrusion section 2132 with a smaller outer diameter connected in sequence. The vertical pipe 3 is sleeved on the first protrusion section 2131, and a liquid-holding gap 31 is formed between the second protrusion section 2132 and the vertical pipe 3. At this time, the refrigerant in the liquid-holding gap 31 will be guided to flow through the refrigerant flow at the position of the inner wall of the vertical pipe 3, which plays a flexible guiding role, improves the flow state of the refrigerant at the main valve port 212, reduces the friction between the refrigerant and the protrusion 213, and improves the refrigerant noise of the electronic expansion valve 100.

[0067] Furthermore, in one embodiment, the inner diameter of the second guide hole section 2122 gradually increases in the direction toward the outer end of the main valve port 212, and the inner wall surface at the port of the second guide hole section 2122 is connected to the outer side surface of the second protrusion section 2132, which further reduces the friction between the refrigerant and the protrusion 213 and improves the refrigerant noise of the electronic expansion valve 100.

[0068] The size of the liquid-holding gap 31 is also a factor affecting refrigerant noise. In one embodiment, the length of the first protrusion 2131 is L4, the length of the second protrusion 2132 is L5, and 0.4≤L4 / L5≤0.85. Within this size range, the refrigerant noise of the electronic expansion valve 100 is significantly improved, and it has a good effect.

[0069] In addition, the dimensional relationship between the inner wall structure of the main valve port 212 and the outer side structure of the protrusion 213 also affects the refrigerant noise. In one embodiment, the length of the rectifier orifice section 2123 is L2, the depth of the second guide orifice section 2122 is L3, and 0.4≤(L2+L3) / (L4+L5)≤0.85. Within this dimensional relationship range, the refrigerant noise of the electronic expansion valve 100 is significantly improved, and it has a good effect.

[0070] The inner wall of the needle sleeve cavity 211 is provided with a main overflow hole 214 that communicates with the main valve cavity 11. The needle sleeve cavity 211 and the main valve cavity 11 are connected through the main overflow hole 214. In one embodiment, the electronic expansion valve 100 also includes a horizontal pipe 4 that communicates with the main valve cavity 11. The horizontal pipe 4 extends radially along the valve needle sleeve 21 and faces the outer end of the main valve port 212. The main overflow hole 214 and the horizontal pipe 4 are staggered. This reduces the impact of the refrigerant's impact kinetic energy on the refrigerant flow, allowing the refrigerant to be introduced from the horizontal pipe 4 and fill the main valve cavity 11 before entering the needle sleeve cavity 211 through the main overflow hole 214, or the refrigerant to enter the main valve cavity 11 from the needle sleeve cavity 211, fill the main valve cavity 11, and then exit from the horizontal pipe 4. This reduces the flow rate of the refrigerant impacting the valve needle 22, improving reliability and durability.

[0071] It should be noted that multiple main overflow holes 214 are provided and are spaced apart along the circumference of the main valve chamber 11 to ensure the flow of refrigerant between the main valve chamber 11 and the needle sleeve chamber 211.

[0072] To avoid abnormal refrigerant noise caused by refrigerant directly impacting the valve needle 22, in one embodiment, the center line of the main overflow hole 214 and the radial plane of the valve needle sleeve 21 form an angle β, where 30°≤β≤60°. A preferred value is β=45°. In this way, while ensuring the refrigerant flow rate, the direct impact of refrigerant on the valve needle 22 is reduced as much as possible, further reducing refrigerant noise.

[0073] In one embodiment, the inner diameter of the needle sleeve cavity 211 is D. S The diameter of the main overflow hole 214 is d, and it is 1.8 mm. <d<0.71D S Within this size range, the refrigerant noise of the electronic expansion valve 100 is significantly reduced, with a good effect. In addition, the lower edge of the main overflow hole 214 can be positioned adjacent to the bottom wall of the main valve chamber 11.

[0074] To reduce the wobbling between the valve needle sleeve 21 and the valve sleeve, the gap between them is very small. However, after the overflow orifice is enlarged, the valve needle sleeve 21 will block part of the overflow orifice in the fully closed state, resulting in obstructed flow. In one embodiment, the valve needle assembly 2 further includes a valve needle 22 disposed in the valve needle sleeve 21. The valve needle 22 includes a movable part 222 that is sealed and slidably installed in the valve needle sleeve 21, and a needle tip 221 that connects to the movable part 222 and is at least partially disposed in the main valve port 212. The movable part 222 has a covering section 2221 that at least partially covers the main overflow orifice 214. The movable part 222 is reduced at least at the covering section 2221, so that an annular conductive cavity 5 communicating with the main overflow orifice 214 is formed between the covering section 2221 and the valve needle sleeve 21. The covered part of the main overflow orifice 214 is opened through the annular conductive cavity 5, reducing the impact on the refrigerant flow and improving the efficiency of the electronic expansion valve 100.

[0075] Specifically, in one embodiment, the outer diameter of the covering segment 2221 is D. f2 The inner diameter of the needle sleeve cavity 211 is D. S And 0.8 <D f2 / D S <0.98, within this size range, improves the flow state of the refrigerant.

[0076] In one embodiment, the distance between the end face of the covering section 2221 away from the main valve port 212 and the end face of the valve needle sleeve 21 away from the main valve port 212 is L. P And 0.8≤L p / D S With a value of ≤1.7, the valve needle 22 vibration caused by refrigerant impact is reduced, and the refrigerant noise of the electronic expansion valve 100 is significantly improved, showing a good effect.

[0077] The present invention also proposes a refrigerant circulation pipeline, which includes an electronic expansion valve 100. The refrigerant circulation pipeline includes all the technical features of the electronic expansion valve 100 and therefore has all the technical effects brought about by the above-mentioned technical features, which will not be described in detail here.

[0078] The present invention also proposes an air conditioning system, which includes a refrigerant circulation pipeline and an electronic expansion valve 100. The air conditioning system includes all the technical features of the above-mentioned refrigerant circulation pipeline and therefore has all the technical effects brought about by the above-mentioned technical features, which will not be elaborated here.

[0079] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that, include: The valve seat forms the main valve chamber; as well as, A valve needle assembly includes a valve needle sleeve fitted inside the main valve cavity. The valve needle sleeve has a needle sleeve cavity, and a main valve port is formed on one end wall of the needle sleeve cavity. The main valve port includes a first guide hole section, a second guide hole section, and a rectifying hole section located between the first guide hole section and the second guide hole section, distributed along a direction toward the outer end of the main valve port. The rectifying hole section is connected to the first guide hole section, and the diameter of the rectifying hole section is larger than the diameter of the first guide hole section, so that the inner wall surfaces of the rectifying hole section and the first guide hole section are stepped. The end of the valve needle sleeve corresponding to the main valve port protrudes outside the main valve cavity to form a protruding part; The electronic expansion valve also includes a vertical connecting pipe, one end of which is sleeved onto the protruding part; The outer side of the protrusion is stepped. In the direction towards the outer end of the main valve port, the protrusion includes a first protrusion section with a larger outer diameter and a second protrusion section with a smaller outer diameter, which are connected in sequence. The vertical pipe is sleeved to the first protruding section, and a liquid-holding gap is formed between the second protruding section and the vertical pipe; In the direction toward the outer end of the main valve port, the inner diameter of the second guide hole section gradually increases, and the inner wall surface at the port of the second guide hole section is connected to the outer surface of the second protruding section. The inner diameter of the vertical pipe is D. L ; The inner diameter of the main valve port is D2, and 0.1 ≤ (D L -D2) / D2≤0.4; The length of the first protruding segment is L4, the length of the second protruding segment is L5, and 0.4≤L4 / L5≤0.

85.

2. The electronic expansion valve as described in claim 1, characterized in that, The diameter of the first guide hole section is D, the diameter of the rectifying hole section is D1, and D1 / D≥2.

3. The electronic expansion valve as described in claim 1, characterized in that, The valve needle assembly also includes a valve needle disposed within the valve needle sleeve, wherein the tip of the valve needle is at least partially disposed within the main valve port, and the distance between the end face of the tip and the bottom wall of the sleeve cavity is L; The length of the first guide hole section is L1, the length of the rectifying hole section is L2, the length of the second guide hole section is L3, and L1+L2+L3≤L≤1.5(L1+L2+L3).

4. The electronic expansion valve as described in claim 1, characterized in that, The diameter of the rectifier orifice is D1, and 0.65≤D1 / D2≤0.

85.

5. The electronic expansion valve as described in claim 1, characterized in that, The length of the rectifying orifice section is L2, the depth of the second guiding orifice section is L3, and 0.4≤(L2+L3) / (L4+L5)≤0.

85.

6. The electronic expansion valve as described in claim 1, characterized in that, The inner wall of the needle sleeve cavity is provided with a main overflow hole that connects to the main valve cavity.

7. The electronic expansion valve as described in claim 6, characterized in that, The electronic expansion valve also includes a transverse connecting pipe communicating with the main valve chamber, the transverse connecting pipe being arranged to extend radially along the valve needle sleeve; The main overflow hole is offset from the horizontal connecting pipe in the direction of the outer end of the main valve port.

8. The electronic expansion valve as described in claim 6, characterized in that, The angle between the centerline of the main overflow hole and the radial plane of the valve needle sleeve is β, and 30°≤β≤60°.

9. The electronic expansion valve as described in claim 8, characterized in that, β＝45°。 10. The electronic expansion valve as described in claim 6, characterized in that, The inner diameter of the needle sleeve cavity is D. S ; The diameter of the main overflow orifice is d, and is 1.8 mm. <d<0.71D S .

11. The electronic expansion valve as described in claim 6, characterized in that, Multiple main overflow holes are provided and spaced apart along the circumference of the main valve cavity.

12. The electronic expansion valve as described in claim 6, characterized in that, The valve needle assembly further includes a valve needle disposed within the valve needle sleeve. The valve needle includes a movable portion that is sealed and slidably mounted within the valve needle sleeve, and a needle tip portion that connects to the movable portion and is at least partially disposed within the main valve port. The movable portion has a covering section that at least partially covers the main overflow orifice. The movable portion is reduced in size at least at the covering section so that an annular through cavity communicating with the main overflow orifice is formed between the covering section and the valve needle sleeve.

13. The electronic expansion valve as described in claim 12, characterized in that, The outer diameter of the covered section is D. f2 The inner diameter of the needle sleeve cavity is D. S And 0.8 <D f2 / D S <0.

98.

14. The electronic expansion valve as described in claim 13, characterized in that, The distance between the end face of the covered section away from the main valve port and the end face of the valve needle sleeve away from the main valve port is L. P And 0.8≤L p / D S ≤1.

7.

15. The electronic expansion valve as claimed in claim 1, characterized in that, The valve needle assembly includes a valve needle, which is sleeved inside the needle sleeve cavity. The valve needle is movable and adjustable along the length direction of the valve needle sleeve, and the tip of the valve needle is at least partially located inside the main valve port.

16. A refrigerant circulation pipeline, characterized in that, Includes the electronic expansion valve as described in any one of claims 1 to 15.

17. An air conditioning system, characterized in that, Includes the refrigerant circulation pipeline as described in claim 16.

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