Electronic expansion valve

Abstract

The electronic expansion valve has a valve cavity and further comprises a core assembly, the core assembly comprising a body, a sleeve and a valve core seat, one end of the sleeve being fixedly and sealingly connected with the body and the other end being movably and sealingly connected with the valve core seat, the sleeve, the body and the valve core seat substantially defining a turbulence cavity, the body comprising a side wall portion and a connecting portion, the connecting portion comprising a bottom wall, fluid entering the turbulence cavity being capable of impacting the bottom wall so as to generate a turbulence effect, thereby relatively improving the noise of fluid flowing through the electronic expansion valve.

Description

[Technical Field]

[0001] This invention relates to the field of refrigeration control technology, and in particular to electronic expansion valves. [Background Technology]

[0002] The refrigeration system includes a compressor, a throttling element, an outdoor heat exchanger, and other components. The throttling element can be an electronic expansion valve, used for regulating the flow of refrigerant. Using an electronic expansion valve allows for relatively precise control, thus improving system energy efficiency. However, some noise may be generated when the refrigerant passes through the electronic expansion valve. [Summary of the Invention]

[0003] The purpose of this invention is to provide an electronic expansion valve that can relatively improve the noise problem generated when refrigerant flows through the electronic expansion valve.

[0004] The electronic expansion valve provided by the present invention has a valve cavity and further includes a core assembly. The core assembly includes a body, a sleeve, and a valve core seat. One end of the sleeve is fixedly connected to the body, and the other end is movably connected to the valve core seat. The electronic expansion valve also has a turbulence cavity. The body, the sleeve, and the valve core seat substantially define the turbulence cavity. The body includes a side wall portion and a connecting portion. The side wall portion and the connecting portion are fixedly connected or are an integral structure. The valve core seat includes a first valve port. The connecting portion includes a rod head that can approach or move away from the first valve port. The core assembly includes a body receiving cavity. The side wall portion is provided with a first flow hole that connects the body receiving cavity and the valve cavity. The body also has a second flow hole that connects the body receiving cavity and the turbulence cavity. The side wall portion includes a lower end face that is located above the outlet of the second flow hole in the axial direction.

[0005] The electronic expansion valve provided by this invention has an optimized core component structure. The electronic expansion valve has a turbulence chamber, which can relatively reduce the noise generated when fluid flows through the electronic expansion valve. [Attached Image Description]

[0006] Figure 1 A side sectional view of the overall structure of the first embodiment of the electronic expansion valve of the present invention is provided;

[0007] Figure 2 A front sectional view of the overall structure of the first embodiment of the electronic expansion valve of the present invention is provided;

[0008] Figure 3 A cross-sectional view of the overall structure of a second embodiment of the electronic expansion valve is provided for this invention;

[0009] Figure 4 for Figure 3Enlarged cross-sectional view of the core component structure of the electronic expansion valve;

[0010] Figure 5 A three-dimensional schematic diagram of the core assembly of the electronic expansion valve provided by the present invention;

[0011] Figure 6 for Figure 3 A cross-sectional schematic diagram of the body and connecting part of the electronic expansion valve core assembly;

[0012] Figure 7 for Figure 3 A three-dimensional schematic diagram of the body and connecting parts of the electronic expansion valve core assembly;

[0013] Figure 8 for Figure 7 A bottom view of the body and connecting parts of the electronic expansion valve core assembly.

Detailed Implementation Methods

[0014] To enable those skilled in the art to better understand the technical solutions provided by the present invention, the technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] It should be noted that the following technical solution describes a specific electronic expansion valve structure, mainly focusing on improving the structure of the core assembly to reduce noise during refrigerant flow. Other components of the electronic expansion valve, such as the magnetic rotor assembly, lead screw valve core assembly, nut assembly, and stop device, are not limited here. The technical solution of this invention does not specifically limit the structure of these components. Those skilled in the art can apply the technical solution disclosed herein to all similar electronic expansion valve structures. The descriptions of the aforementioned magnetic rotor assembly, lead screw valve core assembly, and other components are merely for understanding the basic working principle of the electronic expansion valve and are not intended to impose structural limitations.

[0016] The electronic expansion valve provided by the present invention has a valve cavity 102 and also includes a core assembly 10. The core assembly 10 includes a body 11, a valve core seat 12, and a sleeve 13. One end of the sleeve 13 is fixedly connected to the body 11, and the other end is movably connected to the valve core seat 12. The core assembly 10 also has a turbulence cavity C. The body 11, the valve core seat 12, and the sleeve 13 generally define the turbulence cavity C. It should be noted that the turbulence cavity C here refers to the space generally located above the protrusion 122 of the valve core seat 12, which is enclosed by the body 11, the valve core seat 12, and the sleeve 13. For the convenience of system or operation, the turbulence cavity C may accommodate an elastic element 15 or other components, but this does not conflict with the fact that the turbulence cavity C is generally defined by the body 11, the valve core seat 12, and the sleeve 12. The body 11 includes a side wall portion and a connecting portion. The side wall portion and the connecting portion can be fixedly connected, or the body 11 can be an integral structure. The valve core seat 12 includes a first valve port 120. The connecting portion includes a rod head, which can approach or move away from the first valve port 120. The core assembly 10 also includes a body receiving cavity 114. The side wall portion is provided with a first flow hole, which connects the valve cavity 102 and the receiving cavity 114. The body is provided with a second flow hole, which connects the body receiving cavity 114 and the turbulence cavity C. The side wall portion includes a lower end face, which extends axially. The lower end face is located above the outlet of the second flow hole. The refrigerant in the refrigeration system is generally a two-phase gas-liquid refrigerant. After the refrigerant enters the body receiving cavity 114 from the valve cavity 102, it flows into the turbulence cavity C through the second flow hole. According to the gravity separation effect of gas and liquid in the gas-liquid separation principle, the refrigerant with larger bubbles diffuses towards the lower end face of the side wall, while the fluid containing smaller bubbles sinks. Finally, the fluid flowing out of the first valve port contains fewer bubbles, which can relatively improve the noise generated when the fluid flows through the electronic expansion valve.

[0017] The following is combined Figures 1-2 The first embodiment of the electronic expansion valve provided by the present invention is described in detail below, such as... Figure 1The electronic expansion valve shown includes a valve body 1, a valve seat 2, and a valve cavity 102. The valve body 1 and the valve seat 2 are fixedly connected. The valve body 1 can also be an integral structure with the valve seat 2. When the valve body 1 is an integral structure, a second valve port 101 can also be opened on the valve body 1. The valve seat 2 is provided with a second valve port 101 and a first connection interface. The side wall of the valve body 1 is provided with a second connection interface. A first connection pipe B is fixedly connected to the first connection interface, and a second connection pipe A is fixedly connected to the second connection interface. It also includes a housing 70, and the housing 70 is connected to the valve body 1. The upper end is fixedly connected, and the outer shell 70 and the valve body 1 substantially define the valve cavity 102. The coil component is sleeved on the outer periphery of the outer shell 70. The electronic expansion valve also includes a core assembly 10, which is located in the valve cavity 102 and at least part of the valve cavity 102 is filled by the core assembly 10. The valve cavity 102 refers to the cavity formed around the core assembly 10 after being filled by the core assembly 10. The valve body 1 includes a guide portion 1a, which guides the core assembly 10. The core assembly 10 includes a body 11, a valve core seat 12, and a sleeve. The sleeve 13 and threaded part 14 are included. One end of the sleeve 13 is fixedly and sealed to the body 11, and the other end of the sleeve 13 is movably and sealed to the valve core seat 12. The threaded part 14 is fixedly or limitedly connected to the body 11. The electronic expansion valve also includes a limit seat 20 and a rotor drive rod assembly 30. The rotor drive rod assembly 30 includes a rotor 31, a connecting seat 32, and a drive rod 33. The drive rod 33 is fixedly connected to the rotor 31 through the connecting seat 32. The limit seat 20 is directly or indirectly fixedly connected to the valve body 1. The valve core seat 1... 2 includes a first valve port 120, and the body 11 includes a side wall portion 111 and a connecting portion 112. The connecting portion 112 includes a rod head 1122. The drive rod 33 can move the core assembly 10 axially up and down through the threaded engagement with the threaded part 14, so that the valve core seat 12 approaches or moves away from the second valve port 101 to form a large flow rate regulating mechanism of the electronic expansion valve, and the rod head 1122 approaches or moves away from the first valve port 120 to form a small flow rate regulating mechanism of the electronic expansion valve, thereby realizing the two-stage flow rate regulation of the electronic expansion valve.

[0018] In this embodiment, the body 11 is an integral structure, with a first sidewall 111 as the sidewall portion. The body 11 can be integrally formed from stainless steel. The body 11 is generally cylindrical in shape and includes the first sidewall 111 and a connecting portion 112. The connecting portion 112 includes a bottom wall 1121 and a rod head 1122. The core assembly 10 has a body receiving cavity 114. The threaded component 14 includes a threaded component body 14a, with at least a portion of the threaded component body 14a located in the body receiving cavity 114. The sidewall 111 and the bottom wall 1121 generally define the body receiving cavity 114. It should be noted that the body receiving cavity 114 refers to the cavity before the threaded component 14 and the muffler are installed. The first sidewall 111 and the connecting portion 112 are integrally formed. A first flow hole 111a is provided on one side wall portion 111. The body receiving cavity 114 and the valve cavity 102 are connected through the first flow hole 111a. The first side wall portion 111 includes a thick-walled portion 111b and a thin-walled portion 111c. The first flow hole 111a is located in the thick-walled portion 111b. The thick-walled portion 111b and the thin-walled portion 111c are connected by a first step portion B. The first step portion B includes a first step surface 1111, which forms the lower end surface of the first side wall portion 111. It should be noted that the first step surface 1111 here is not limited to a step surface, but can also be an inclined surface or other irregularly shaped structures with multiple steps. The electronic expansion valve also includes a second flow hole 1121a. The thin-walled portion 111c may have a second flow hole 1121a. Along the axial direction, the first step surface 1111 is located above the outlet of the second flow hole 1121a. The electronic expansion valve also includes a turbulence chamber C, which is generally defined by the body 11, valve core seat 12, and sleeve 13. The second flow hole 1121a connects the body receiving cavity 114 and the turbulence chamber C. When fluid enters the turbulence chamber C through the second flow hole 1121a, according to the principle of gravity separation of gaseous and liquid states in gas-liquid separation, the fluid containing fewer bubbles settles on the bottom wall 1121, while the fluid containing larger bubbles diffuses upward toward the first step surface 1111. Finally, the fluid flowing out of the first valve port 120 contains fewer bubbles, which can relatively improve the noise problem generated by the refrigerant flowing through the electronic expansion valve. Alternatively, the bottom wall 1121 can also have a second step surface 1121. Two flow holes 1121a are provided, which penetrate the upper and lower surfaces of the bottom wall 1121. The first step surface 1111 is positioned above the outlet of the second flow hole 1121a in the axial direction. To ensure fluid flow, at least three second flow holes 1121a can be provided. The rod head 1122 can have a third flow hole 1122a. Fluid enters the main body receiving cavity 114 from the valve cavity 102 through the first flow hole 111a and then flows out through the second flow hole 1121a and the third flow hole 1122a. The electronic expansion valve also includes a second silencing component 42, which is located in the main body receiving cavity 114 and substantially covers the first flow hole 111a, the second flow hole 1121a, and the third flow hole 1122a.When fluid enters the valve chamber 102, the gas-liquid two-phase fluid with a large number of bubbles is dispersed by the second silencer and flows out through the second flow hole 1121a and the third flow hole 1122a. The rod head 1122 can approach or move away from the first valve port 120. After the fluid enters the turbulence chamber C through the second flow hole 1121a, it flows out through the first valve port 120. The valve core seat 12 includes a circumferential protrusion 122 extending from the valve core seat body. The protrusion 122 includes an upper end face 122a. When the small flow rate regulating mechanism is in the closed state, that is, when the rod head 1122 abuts against the first valve port 120, a first gap is formed between the lower bottom surface 1123a and the upper end face 122a of the bottom wall 1121. L1, the first valve port 120 has a valve port diameter d1, where L1 < 1.5d1. Through the above design, the distance between the bottom wall and the valve core seat varies with different valve port diameters of the electronic expansion valve, making the bottom wall 1121 relatively close to the valve core seat 12. After the fluid enters the turbulence chamber C through the second flow hole 1121a, it can impact the lower bottom surface 1123a of the bottom wall in the reverse direction. This causes a large number of air bubbles in the fluid to be dispersed and broken up by the impact on the lower bottom surface, forming a fluid containing smaller air bubbles. If the bottom wall 1121 is far from the valve core seat 12, the impact effect between the fluid and the valve core seat and the bottom wall cannot be achieved. When the rod head 1122 abuts against the first valve port 120, the first... A second gap L2 is formed between the first step surface 1111 and the upper end surface 122a. The second gap L2 is larger than the first gap L1. When the second flow hole 1121a is located at the bottom wall 1121, the fluid enters the turbulence chamber C through the second flow hole 1121a and impacts the lower bottom surface 1123a of the bottom wall 1121 with the valve core seat 12. The air bubbles contained in the fluid can be further dispersed and broken. After the fluid impacts the lower bottom surface 1123a, according to the gravity separation effect of gas and liquid in the gas-liquid separation principle, the fluid containing relatively more air bubbles diffuses towards the first step surface 1111 after being dispersed, and is finally controlled by the fluid passing through the second valve port 120 at high speed. The air bubbles contained in the fluid have been sufficiently broken and dispersed, which can relatively reduce the noise when the fluid flows through the second valve port 120. The upper end of the valve core seat 12 is also provided with a recess 125. The electronic expansion valve also includes a first silencing element 41, at least part of which is located in the recess 125. The first silencing element 41 is arranged opposite to the second flow hole 1121a. After the fluid enters the turbulence chamber C through the second flow hole 1121a, the fluid containing more air bubbles is further dispersed by impacting the air bubbles contained in the lower bottom surface 1123a of the bottom wall 1121. Furthermore, under the action of the second silencing element 42, the air bubbles in the fluid flowing through the second silencing element 42 are dispersed again to achieve further noise reduction. It should be noted that in this embodiment, the bottom wall 1121 and the valve core seat 12 are arranged in a roughly parallel structure. In other structures, the bottom wall 1121 can also be an irregular structure such as a slope, an arc, or a multi-step shape. Sleeve 13 includes a large diameter portion 131, a small diameter portion 132, and a sleeve step 133.The sleeve 13 is generally cylindrical and can be integrally formed from stainless steel or the components can be machined separately and then fixedly connected. The large-diameter part 131 and the small-diameter part 132 are connected by the sleeve step 133. The large-diameter part 131 is fixedly connected to the thick-walled part 111b of the first side wall part 111. The small-diameter part 132 is movably and sealingly connected to the outer peripheral wall of the valve core seat 12. The outer peripheral part of the valve core seat 12 is provided with a sealing element 124 (in this embodiment, a sealing ring). The small-diameter part 132 is sealed to the valve core seat through the sealing element 124. The body 11 and the sleeve 13 can move the valve core seat 12 axially in the valve cavity 102. The valve core seat 12 can move axially along the small-diameter wall of the small-diameter part 132. During the lifting and lowering motion, the protrusion 122 can approach or move away from the sleeve step 133. The body 11, valve core seat 12, and sleeve 13 are generally defined to form a closed cavity, which is the turbulence chamber C of the electronic expansion valve. When the electronic expansion valve is in the fully closed state, the valve core seat 12 closes the second valve port 101, and the rod head 1122 closes the first valve port 120. At this time, the protrusion 122 is relatively far away from the sleeve step 133. When the electronic expansion valve is in the small flow regulation state, the valve core seat 12 closes the second valve port 101, and the rod head 1122 moves away from the first valve port 120. At this time, the protrusion 122 is relatively close to the sleeve step 133. When the first valve port 120 is fully open, the protrusion 122 abuts against the sleeve step 133. The valve core seat 12 also includes a valve core receiving cavity 121. The first valve port 120 connects the turbulence cavity C and the valve core receiving cavity 121. The electronic expansion valve also includes a third silencing element 43 and a retaining ring 123. The third silencing element is located in the valve core receiving cavity 121 and is limited by the retaining ring 123 to prevent the third silencing element 43 from falling off the valve core seat 12. After passing through the first valve port 120, the fluid flows out through the second connecting pipe A after being further turbulent by the third silencing element 43. The electronic expansion valve also includes an elastic element 15. The elastic element 15 is located in the turbulence cavity C, and the upper end of the elastic element 15 abuts against the first stepped surface 1111, while the other end abuts against the protrusion 122 of the valve core seat 12.

[0019] The following is a brief description of the threaded component 14 and its connection method with the body 11. The threaded component 14 includes a threaded component body 14a and a protrusion 141. At least a portion of the threaded component body 14a is located in the body receiving cavity 114. The upper end of the body 11 is provided with at least two mounting grooves 113. The protrusion 141 is adapted to the mounting grooves 113. The core assembly 10 also includes a mating part 16, which is press-fitted into the upper opening of the body 11. The upper opening forms a step 117. The mating part 16 abuts against the third step 117 and can be fixedly connected to the body 11 by welding or other means. This is used to limit the connection of the nut 14 and prevent the nut from being moved. 14 is detached from the main body 11. With the aforementioned configuration, the nut 14 can only move vertically along the axial direction and cannot rotate circumferentially. Alternatively, the nut can be made of metal and fixedly connected to the main body via a connecting piece or similar means. The connection method between the nut and the main body is not restricted here. The threaded component body 14a includes an upper thread and a lower thread 143. The outer peripheral wall of the lower thread 143 abuts against the inner wall of the main body 11, and the lower end of the lower thread 143 is located above the first flow hole 111a and abuts against the second muffler 42 to limit the movement of the second muffler 42. The lower end of the lower thread 143 and the second muffler 42 can also... A gap is formed, and the second muffler 42 is prevented from being limited to the main body 11 by dotted positioning. The threaded part 14 has a threaded inner cavity 144 and also includes a threaded portion 142. In this embodiment, the threaded portion 142 can be located on the inner wall of the threaded part 14. In another structure of the rotor drive rod assembly 30, the threaded part 14' also includes a connector 141' and a screw 142'. The screw 142' and the connector 141' are integrally injection molded or fixedly connected. The threaded portion 142 is provided on the outer peripheral wall of the screw. In this structure, the drive rod 33 has an internal threaded portion and is located on the inner wall of the recess of the drive rod 33. The threaded portion 142 and the drive rod 33 are engaged by threaded engagement. The core assembly 10 performs axial lifting and lowering movements, while the drive rod 33 only rotates circumferentially without axial lifting and lowering. The electronic expansion valve also includes a bearing 34, which is fixedly connected to the drive rod 33. The bearing 34 is located in the mounting hole of the limiting seat 20 and includes an inner ring portion 341, an outer ring portion 342, and a rolling element 343. The inner ring portion 341 is fixedly connected to the drive rod 33, and the outer ring portion 342 is fixedly connected to the side wall of the limiting seat. The inner ring portion and the drive rod can rotate circumferentially relative to the outer ring portion 342 and the limiting seat 20 through the rolling element 343. The drive rod 33 also includes a drive rod step 331, which abuts against the inner ring portion 341.Simultaneously, the top of the drive rod 33 abuts against the top of the housing 70 to limit the drive rod 33 in the axial direction and prevent it from moving erratically. The side wall of the limiting seat 20 is provided with at least one limiting groove 21 to cooperate with the protrusion 141 of the nut 14. As the core assembly 10 moves axially up and down, the protrusion 141 can move axially up and down along the limiting groove 21. When the protrusion 141 is relatively close to the top wall of the limiting groove 21, the core assembly 10 is relatively far away from the second valve port 101. When the protrusion 141 is relatively close to the bottom of the limiting groove 21, the core assembly 10 is relatively close to or abuts against the second valve port 101. The cooperation between the nut 14 and the limiting groove 21 controls the up and down stroke of the core assembly 10.

[0020] The following is a brief description of the noise reduction principle of the electronic expansion valve provided by this invention. After the fluid enters the valve chamber 102 from the first connecting pipe B, it flows into the second noise reduction component 42 through the first flow hole 111a. The fluid containing larger bubbles is dispersed to form smaller bubbles. According to the principle of gas-liquid separation, the fluid containing smaller bubbles flows out through the second flow hole 1121a and the third flow hole 1122a. The fluid containing larger bubbles enters the inner cavity 144 of the threaded component upward. The first step surface 1111 is located axially above the second flow hole 1121a. The fluid enters the turbulence chamber C through the second flow hole 1121a. According to the principle of gas-liquid separation, the fluid containing fewer bubbles sinks to the bottom wall 1121, while the fluid containing more bubbles diffuses upward toward the first step surface 1111. Finally, the fluid passing through the first valve port 120 has been dispersed, which can relatively improve the noise generated by the fluid flowing through the electronic expansion valve, achieve noise reduction, and improve the comfort of the customer using the product.

[0021] The following is combined Figures 3-8This invention provides a second embodiment of the electronic expansion valve, which differs from the first embodiment in that the body 11' is a split structure. In this embodiment, the body 11' includes a second sidewall portion 111' and a connecting portion 112'. The second sidewall portion 111' and the connecting portion 112' are fixedly connected. The connecting portion 112' includes a third sidewall portion 1123', a bottom wall 1121', and a rod head 1122'. The connecting portion 112' can be integrally formed. In this embodiment, the second sidewall portion 111' and the third sidewall portion 1123' form the sidewall portion of the body 11'. The second sidewall portion 111' includes an extension portion 1112' and a lower end portion 1111'. The extension 1112' protrudes toward the body cavity 114 and forms an opening A1. The lower end portion 1111' extends axially downward. The second sidewall portion 111' includes a recess A. The extension 1112' and the lower end portion 1111' generally define the recess A. At least a portion of the third sidewall portion 1123' is located in the recess A, and the end face of the third sidewall portion 1123' abuts against the extension 1112', while its side abuts against the second sidewall portion 111'. The core assembly 10 also includes a connecting cavity 1124. The extension 1112', the third sidewall portion 1123', and the bottom wall 1121' generally define the connecting cavity 1124. The first flow hole 111a' The second sidewall portion located above the extension 1112' has an opening A1 connecting the main body receiving cavity 114 and the connecting portion receiving cavity 1124. The electronic expansion valve also includes a second silencer 42' located in the connecting portion receiving cavity 1124. The second sidewall portion 111' and the third sidewall portion 1123' form a second step B1, and the second step surface 1111a' of the second step B1, i.e., the end face of the lower end of the second sidewall portion 111', forms a lower end face. The third sidewall portion 1123' is provided with a second flow hole 1121a', and the second step surface 1111a' is located axially above the outlet of the second flow hole 1121a', or the bottom wall 1 121' may also be provided with the second flow hole 1121a' and the second step surface 1111a' is located above the outlet of the second flow hole 1121a' in the axial direction. The electronic expansion valve also includes an elastic element 15. The elastic element 15 is sleeved on the outer periphery of the third side wall portion 1123' and one end abuts against the second step surface 1111a' and the other end abuts against the protrusion 122 of the valve core seat 12. The elastic element 15 can prevent the valve core seat 12 from shaking during operation and can apply force to the valve core seat 12 in the closed state to prevent it from dislodging from the second valve port 101. The fluid noise principle and other structures have been described in detail in the first embodiment and will not be repeated here.

[0022] The electronic expansion valve provided by this invention has a turbulence chamber through optimized design of the core component structure. After the fluid enters the main body cavity through the first flow hole, it enters the turbulence chamber through the second flow hole. The lower end face of the side wall is located axially above the outlet of the second flow hole. After the fluid enters the turbulence chamber, the larger bubbles contained in it are further dispersed into smaller bubbles. According to the principle of gas-liquid separation and gravity sedimentation, the fluid containing fewer bubbles sinks to the bottom wall direction, while the remaining relatively more bubbles diffuse towards the lower end face of the side wall. Finally, the fluid flowing out of the first valve port contains fewer bubbles, which can relatively improve the noise generated when the fluid flows through the electronic expansion valve.

[0023] It should be noted that the directional terms such as "up" and "down" mentioned in the various embodiments of this specification are all introduced for ease of description, based on the accompanying drawings. Furthermore, the terms "large" and "small," as well as ordinal numbers such as "first" and "second" in the component names, are also introduced for ease of description and do not imply any limitation on the order of the components. Additionally, since some parts of the components provided in the above embodiments have the same function, this specification adopts a unified naming convention for these parts. The electronic expansion valve provided by the relevant technical solution has been described in detail above. Specific embodiments have been used in this text for illustration. The descriptions of the above embodiments are only for helping to understand the method and core ideas of the present invention and are not intended to limit the present invention in any way.

Claims

1. An electronic expansion valve, characterized in that, The electronic expansion valve has a valve cavity and also includes a core assembly. The core assembly includes a body, a sleeve, and a valve core seat. One end of the sleeve is fixedly connected to the body, and the other end is movably connected to the valve core seat. The electronic expansion valve also has a turbulence cavity, which is substantially defined by the body, the sleeve, and the valve core seat. The body includes a sidewall portion and a connecting portion. The sidewall portion and the connecting portion are fixedly connected or are an integral structure. The valve core seat includes a first valve port, and the connecting portion includes a rod head that can approach or move away from the first valve port. The core assembly includes the body... The body includes a receiving cavity, and the side wall portion is provided with a first flow hole, which connects the receiving cavity and the valve cavity. The body also has a second flow hole, which connects the receiving cavity and the turbulence cavity. The side wall portion includes a lower end face, which is located above the outlet of the second flow hole in the axial direction. The connecting portion also includes a bottom wall. When the rod head abuts against the first valve port, the bottom wall forms a first distance from the valve core seat, and the lower end face forms a second distance from the valve core seat. The second distance is greater than the first distance.

2. The electronic expansion valve according to claim 1, characterized in that, The bottom wall is provided with a second flow hole and the second flow hole penetrates the upper and lower surfaces of the bottom wall. The first valve port has a valve port diameter, and the first spacing is less than 1.5 times the valve port diameter.

3. The electronic expansion valve according to claim 1, characterized in that, The upper end of the valve core seat is provided with a recess, and the electronic expansion valve further includes a first silencing component, at least a portion of which is located in the recess and is disposed opposite to the second flow hole.

4. The electronic expansion valve according to claim 1, characterized in that, The body is an integral structure, and the body includes a first sidewall portion, which includes a thick-walled portion, a thin-walled portion, and a first stepped portion. The thick-walled portion and the thin-walled portion are connected through the first stepped portion. The first flow hole is located in the thick-walled portion, the second flow hole is located in the thin-walled portion, and the first stepped surface of the first stepped portion forms the lower end surface.

5. The electronic expansion valve according to claim 4, characterized in that, The electronic expansion valve also includes a second silencing component, and the rod head is provided with a third flow hole. The second silencing component is located in the body receiving cavity and substantially covers the first flow hole, the second flow hole, and the third flow hole.

6. The electronic expansion valve according to claim 1, characterized in that, The main body is a split structure, including a second sidewall portion, which is fixedly connected to the connecting portion. The second sidewall portion includes an extension portion and a lower end portion. The extension portion protrudes toward the receiving cavity of the main body and forms an opening. The lower end portion extends axially downward, and the lower end portion and the extension portion substantially form a recess in the second sidewall portion. The connecting portion includes a bottom wall, a rod head, and a third sidewall portion. At least a portion of the third sidewall portion is located in the recess, and the end face of the third sidewall portion abuts against the extension portion, and the side face abuts against the second sidewall portion. The second sidewall portion and the third sidewall portion form a second step portion, and the second step surface of the second step portion forms the lower end face.

7. The electronic expansion valve according to claim 6, characterized in that, The first flow hole is located on the second sidewall portion and is located above the extension portion. The second flow hole is located on the third sidewall portion. The core assembly also includes a connecting portion receiving cavity. The extension portion, the third sidewall portion, and the bottom wall substantially define the connecting portion receiving cavity. The opening communicates with the body receiving cavity and the connecting portion receiving cavity. The electronic expansion valve also includes a second silencing element. The rod head is provided with a third flow hole. The second silencing element is located in the body receiving cavity and covers the second flow hole and the third flow hole.

8. The electronic expansion valve according to any one of claims 1-7, characterized in that, The valve core seat has a valve core receiving cavity, the first valve port connects the turbulence cavity and the valve core receiving cavity, the valve core seat also has a protrusion, the electronic expansion valve also includes a valve body and a valve seat, the valve body and the valve seat are fixedly connected or are an integral structure, the valve body or the valve seat is provided with a second valve port, the body and the sleeve can carry the valve core seat to perform axial lifting and lowering movement so that the valve core seat approaches or moves away from the second valve port.

9. The electronic expansion valve according to claim 8, characterized in that, The electronic expansion valve also includes a third silencing component and a retaining ring. The third silencing component is located in the valve core receiving cavity, and the retaining ring is connected to the valve core for limiting to prevent the third silencing component from disengaging from the valve core receiving cavity.

10. The electronic expansion valve according to claim 8, characterized in that, The sleeve includes a large-diameter portion, a small-diameter portion, and a sleeve step. The large-diameter portion and the small-diameter portion are connected through the sleeve step. The large-diameter portion is fixedly and sealed to the side wall portion. The small-diameter portion is movably connected to the valve core seat. The protrusion can approach or move away from the sleeve step. A sealing element is provided on the outer periphery of the valve core seat. The small-diameter portion is sealed to the outer peripheral wall of the valve core seat through the sealing element.

11. The electronic expansion valve according to any one of claims 1-7, characterized in that, The electronic expansion valve also includes an elastic element located in the turbulence cavity, with one end of the elastic element abutting against the lower end face and the other end abutting against the valve core seat.

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