Electronic expansion valve

Abstract

The utility model relates to the technical field of valves, in particular to an electronic expansion valve. The electronic expansion valve comprises a valve seat assembly and a valve needle assembly, the valve seat assembly is provided with a valve cavity and a valve port, and the valve needle assembly is movably installed in the valve cavity and used for adjusting the flow at the valve port. The valve seat assembly is provided with a flow guide part at the valve port, a flow guide hole communicating the valve cavity with the valve port is formed in the flow guide part, the intersecting line formed by intersecting the side wall of the flow guide hole and any plane passing through the axis of the valve port is arranged in a continuous straight line or curve mode, and the bottom wall, close to one end of the valve port, of the flow guide hole extends in the radial direction of the valve port and surrounds the peripheral side of the valve port. According to the electronic expansion valve, the problem that an existing electronic expansion valve is poor in flow guiding effect is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to an electronic expansion valve. BACKGROUND

[0002] The electronic expansion valve is an important component in the air conditioning system, which controls the opening degree of the valve port to adjust the flow of refrigerant fluid, so as to realize the purpose of flow control and throttling pressure reduction.

[0003] In the related art, the electronic expansion valve usually does not set a flow guide structure at the valve port, or only sets a conical surface in the form of a horn to realize flow guide. In this way, in the process of refrigerant flowing from the valve cavity into the valve port, the electronic expansion valve has poor flow guide effect on the refrigerant, which is easy to make the valve needle vibrate and produce noise under the impact of the refrigerant, and fails to form a buffer for the high-speed flowing refrigerant, so that the refrigerant flowing through the valve port at too high a speed is easy to cause whistling sound. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide an electronic expansion valve to solve the problem of poor flow guide effect of the existing electronic expansion valve.

[0005] The present application provides an electronic expansion valve, which comprises a valve seat assembly and a valve needle assembly, the valve seat assembly is provided with a valve cavity and a valve port, the valve needle assembly is movably installed in the valve cavity and is used for adjusting the flow at the valve port; the valve seat assembly is provided with a flow guide part at the valve port, the flow guide part is provided with a flow guide hole which communicates the valve cavity and the valve port, wherein the intersection line formed by the side wall of the flow guide hole and any plane passing through the axis of the valve port is continuously linear or curved, and the bottom wall of the flow guide hole close to one end of the valve port extends along the radial direction of the valve port and surrounds the circumferential side of the valve port.

[0006] In one of the embodiments, the side wall of the flow guide hole extends in a columnar or conical shape.

[0007] In one of the embodiments, the side wall of the flow guide hole extends in a conical shape, and the conical angle A satisfies 0

[0008] In one of the embodiments, a first connecting pipe is connected to and communicated with the outer circumferential wall of the valve seat assembly, and along the axial direction of the valve port, the end face of the flow guide part away from the valve port is not lower than the inner circumferential wall of the first connecting pipe close to the valve port.

[0009] In one of the embodiments, along the axial direction of the valve port, the distance from the end face of the flow guide part away from the valve port to the bottom wall of the valve cavity is B, and the shortest distance from the inner wall of the first connecting pipe close to the valve port to the bottom wall of the valve cavity is C, wherein B and C satisfy 0

[0010] In one embodiment, along the axial direction of the valve port, the bottom wall of the guide hole is not lower than the bottom wall of the valve cavity.

[0011] In one embodiment, the inner diameter of the valve port is D, and the inner diameter of the bottom wall of the guide hole is E, wherein D and E satisfy E≥1.5D.

[0012] In one embodiment, the valve seat assembly includes a main valve seat and a first valve seat core, the main valve seat is provided with a mounting hole, the first valve seat core is arranged at the position of the mounting hole and is connected to the main valve seat; wherein the valve cavity is provided in the main valve seat, the valve port is provided in the first valve seat core, and the part of the first valve seat core located in the valve cavity forms the guide portion.

[0013] In one embodiment, the electronic expansion valve further includes a nut, which is fixedly mounted on the valve seat assembly; wherein the nut includes a threaded section and a guide section, the valve needle assembly is inserted into the nut, and the valve needle assembly is threadedly engaged with the threaded section and is movably guided by the guide section.

[0014] In one embodiment, the guide section includes an upper guide section and a lower guide section, and the upper guide section and the lower guide section are respectively arranged on both sides of the threaded section along the axial direction of the valve port, and the upper guide section and the lower guide section are both fitted with a gap with the outer wall of the valve needle assembly to guide the valve needle assembly.

[0015] Compared to the prior art, the electronic expansion valve provided by this application allows refrigerant to flow along the side walls of the guide hole into the valve port after entering the valve cavity. Furthermore, since the intersection lines formed by the side walls of the guide hole and any plane passing through the axis of the valve port are all arranged in a straight line, that is, the side walls of the guide hole can form a continuous guide surface, the pressure of the refrigerant is stable during the flow process, and no significant noise is generated due to sudden changes in the flow area of ​​the guide hole. Furthermore, the bottom wall of the guide hole can form a buffer platform. When the refrigerant flows from the side wall to the bottom wall of the guide hole, the bottom wall of the guide hole can provide a certain buffering effect on the impact of the refrigerant, further alleviating the noise generated during the refrigerant flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A cross-sectional view of an electronic expansion valve according to an embodiment of the present application;

[0018] Figure 2 for Figure 1 Enlarged view of the middle Q.

[0019] The symbols in the figure mean the following:

[0020] 100. Electronic expansion valve; 10. Valve seat assembly; 101. Valve chamber; 102. Valve port; 103. Guide hole; 104. Mounting hole; 105. First channel; 106. Second channel; 11. Main valve seat; 12. First valve seat core; 121. Guide portion; 13. Second valve seat core; 20. Valve needle assembly; 30. First connecting pipe; 40. Second connecting pipe; 50. Nut; 51. Threaded section; 52. Guide section; 521. Upper guide section; 522. Lower guide section. DETAILED DESCRIPTION

[0021] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0022] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0024] In the present application, unless specifically defined and limited otherwise, a first feature "on", "under", or "below" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Moreover, a first feature "above", "over", and "on top of" a second feature can be directly above or obliquely above the second feature, or only indicate that the first feature is higher in horizontal height than the second feature. A first feature "below", "under", and "underneath" a second feature can be directly below or obliquely below the second feature, or only indicate that the first feature is lower in horizontal height than the second feature.

[0025] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The use of the terms "and / or" in the description herein is intended to encompass the various combinations of the items listed in the several lists.

[0026] Electronic expansion valve is an important component in air conditioning system, which controls the opening of valve port to regulate the flow of refrigerant, so as to achieve the purpose of flow control and throttling pressure reduction.

[0027] In the related art, electronic expansion valve usually does not set flow guide structure at the valve port, or only sets a conical surface in the form of a horn to realize flow guide. Thus, in the process of refrigerant flowing from the valve cavity into the valve port, the flow guide effect of the electronic expansion valve on the refrigerant is poor, which is easy to make the valve needle vibrate under the impact of the refrigerant and generate noise, and unable to form a buffer for the high-speed flowing refrigerant, so that the too high-speed refrigerant flowing through the valve port is easy to cause whistling sound.

[0028] Please refer to Figure 1 and Figure 2 To solve the problem of poor flow guide effect of the existing electronic expansion valve, the present application provides an electronic expansion valve 100, which comprises a valve seat assembly 10 and a valve needle assembly 20. The valve seat assembly 10 is provided with a valve cavity 101 and a valve port 102, and the valve needle assembly 20 is movably installed in the valve cavity 101 and used to adjust the flow at the valve port 102. The outer peripheral wall of the valve seat assembly 10 is connected and communicated with a first connecting pipe 30, and the valve seat assembly 10 is connected and communicated with a second connecting pipe 40 at the valve port 102. Here, the first connecting pipe 30 and the second connecting pipe 40 can be used as the inlet and outlet of the refrigerant respectively. That is, the electronic expansion valve 100 of the present application is a bidirectional valve. Specifically, the refrigerant can flow into the valve cavity 101 through the first connecting pipe 30 and then flow out through the valve port 102 and the second connecting pipe 40, or the refrigerant can flow into the valve cavity 101 through the second connecting pipe 40 and the valve port 102 and then flow out through the first connecting pipe 30.

[0029] For ease of explanation, this application takes the first connecting pipe 30 as the refrigerant inlet and the second connecting pipe 40 as the refrigerant outlet as an example for explanation. The other structures and working principles of the electronic expansion valve 100 can adopt the settings of the traditional electronic expansion valve 100 and will not be elaborated here.

[0030] Furthermore, if Figure 2 As shown, the valve seat assembly 10 provided in the present application is provided with a guide portion 121 at the valve port 102, and a guide hole 103 connecting the valve cavity 101 and the valve port 102 is opened on the guide portion 121, wherein the intersection lines formed by the side walls of the guide hole 103 and any plane passing through the axis of the valve port 102 are arranged in a continuous straight line or curve, and the bottom wall of the guide hole 103 near one end of the valve port 102 extends along the radial direction of the valve port 102 and is arranged around the circumference of the valve port 102.

[0031] It is understandable that after flowing into the valve cavity 101, the refrigerant can flow along the side walls of the guide hole 103 into the valve port 102. Moreover, since the intersection lines formed by the side walls of the guide hole 103 and any plane passing through the axis of the valve port 102 are all arranged in a straight line, that is, the side walls of the guide hole 103 can form a continuous guide surface, the pressure of the refrigerant is stable during the flow process, and no large noise is generated due to a sudden change in the flow area of ​​the guide hole 103. At the same time, the bottom wall of the guide hole 103 can form a buffer platform. When the refrigerant flows from the side wall of the guide hole 103 to the bottom wall, the bottom wall of the guide hole 103 can form a certain buffering effect on the impact of the refrigerant, further alleviating the noise generated during the flow of the refrigerant.

[0032] In order to ensure the buffering effect of the bottom wall of the guide hole 103 on the refrigerant, in one embodiment, the inner diameter of the valve port 102 is D, and the inner diameter of the bottom wall of the guide hole 103 is E, where D and E satisfy E ≥ 1.5D. In this way, it can be ensured that the buffer platform formed by the bottom wall of the guide hole 103 has a certain radial extension, thereby effectively increasing the buffering effect of the bottom wall of the guide hole 103 on the refrigerant, reducing the velocity gradient of the refrigerant, and forming a buffer for the refrigerant before entering the valve port 102, which can effectively avoid the generation of whistling sound. Here, the valve port 102 passes through the middle of the bottom wall of the guide hole 103 to form an opening in the middle of the bottom wall of the guide hole 103 that is connected to the guide hole 103. That is, along the axial direction of the valve port 102, the valve port 102, the bottom wall of the guide hole 103, the side wall of the guide hole 103 and the valve cavity 101 are arranged in sequence.

[0033] In one embodiment, along the axial direction of the valve port 102, the bottom wall of the guide hole 103 is not lower than the bottom wall of the valve cavity 101. It is easy to understand that the height of the bottom wall of the guide hole 103 affects the height of the matching position of the valve port 102 and the valve needle assembly 20. If the bottom wall of the guide hole 103 is lower, the position of the valve port 102 will be correspondingly lowered. At this time, in order to ensure the matching effect between the valve needle assembly 20 and the valve port 102, the length of the valve needle assembly 20 needs to be extended in disguise. However, the increase in the length of the valve needle assembly 20 will affect the coaxiality control of the valve needle assembly 20 and the valve port 102, greatly increasing the difficulty of matching the valve needle assembly 20 and the valve port 102. At the same time, because the length of the flow channel below the valve port 102 affects the silencing effect on the refrigerant, it is necessary to ensure that the length of the flow channel is long enough. If the position of the valve port 102 is lowered, the length of the flow channel at the valve port 102 will be shortened, resulting in a decrease in the silencing effect. In this embodiment, by setting the bottom wall of the guide hole 103 to be no lower than the bottom wall of the valve cavity 101, the flow channel length at the valve port 102 can be ensured, thereby improving the silencing effect on the refrigerant.

[0034] Specifically, the reason why increasing the length of the valve needle assembly 20 affects the coaxiality control between the valve needle assembly 20 and the valve port 102 is that, in the electronic expansion valve 100, the valve needle assembly 20 is threadedly engaged with the nut 50 to convert the circumferential rotation of the valve needle assembly 20 into axial movement along the valve port 102. Furthermore, in this embodiment, the valve needle assembly 20 is also guided by the nut 50. In this case, increasing the length of the valve needle assembly 20 will affect the guiding effect of the nut 50 on the valve needle assembly 20, thereby affecting the coaxiality between the flow control cone section at the end of the valve needle assembly 20 and the valve port 102.

[0035] In one embodiment, if Figure 2 As shown, the sidewalls of the guide hole 103 extend in a tapered shape. That is, along the axial direction of the valve port 102, and from the side away from the valve port 102 to the side close to the valve port 102, the flow area of ​​the guide hole 103 gradually decreases. This allows the refrigerant to flow better along the sidewalls of the guide hole 103 to the bottom wall of the guide hole 103 for buffering, which helps reduce the refrigerant flow rate and further reduces the noise generated during the refrigerant flow.

[0036] Furthermore, the cone angle of the conical guide hole 103 is A, and the cone angle A satisfies 0<A≤80°. In this way, the guide hole 103 has a better guiding effect on the refrigerant, thereby reducing the flow rate of the refrigerant and reducing noise.

[0037] Optionally, the cone angle of the conical guide hole 103 can be set to 10°, 20°, 30°, 40°, 50°, 60°, 70° or 80°, etc., which are not listed here one by one.

[0038] However, the invention is not limited thereto. In other embodiments, the sidewalls of the flow guide hole 103 may also extend in a cylindrical shape. That is, the two intersection lines formed by the sidewalls of the flow guide hole 103 and any plane passing through the axis of the valve port 102 are arranged in parallel, so that the flow area of ​​the flow guide hole 103 at all locations along the axis of the valve port 102 is equal. Specifically, when the sidewalls of the flow guide hole 103 extend in a conical or cylindrical shape, the intersection lines formed by the sidewalls of the flow guide hole 103 and any plane passing through the axis of the valve port 102 are arranged as continuous straight lines. Furthermore, the sidewalls of the flow guide hole 103 may also extend in an ellipsoidal shape. In this case, the intersection lines formed by the sidewalls of the flow guide hole 103 and any plane passing through the axis of the valve port 102 are arranged as continuous curves.

[0039] In one embodiment, if Figure 2 As shown, along the axial direction of the valve port 102, the end surface of the guide portion 121 away from the valve port 102 is no lower than the side of the inner circumferential wall of the first connecting pipe 30 close to the valve port 102. In this way, the outer circumferential wall of the guide portion 121 can provide a certain flow blocking effect on the refrigerant flowing from the first connecting pipe 30, reducing the impact of the high-speed refrigerant on the valve needle assembly 20.

[0040] Specifically, along the axial direction of the valve port 102, the distance from the end face of the guide portion 121 away from one end of the valve port 102 to the bottom wall of the valve cavity 101 is B, and the shortest distance from the inner wall of the first connecting pipe 30 close to the valve port 102 to the bottom wall of the valve cavity 101 is C, wherein B and C satisfy 0≤BC≤0.5mm. In this way, the guide portion 121 has a good flow-blocking effect on the basis of ensuring the refrigerant flow capacity. Among them, when BC<0, the flow-blocking effect of the guide portion 121 on the refrigerant is poor, and the high-speed refrigerant will have a greater impact on the valve needle assembly 20, which increases the flow noise of the refrigerant. When BC>0.5mm, the height of the bottom of the guide portion 121 protruding from the inner wall of the first connecting pipe 30 is large, which makes it easy for the refrigerant to form a vortex between the outer wall of the guide portion 121 and the inner wall of the valve cavity 101, which also affects the flow performance of the refrigerant.

[0041] Here, it is preferred to set the distance from the end face of the guide portion 121 away from the valve port 102 to the bottom wall of the valve cavity 101 to be equal to the shortest distance from the inner wall of the first connecting pipe 30 close to the valve port 102 to the bottom wall of the valve cavity 101, that is, B=C. In this way, the guide portion 121 has a blocking effect on the high-pressure refrigerant entering the first connecting pipe 30, and does not affect the circulation capacity of the refrigerant. At the same time, it can also prevent unnecessary vortices from forming between the outer wall of the guide portion 121 and the inner wall of the valve cavity 101. Of course, controlling B to be slightly larger than C can also take into account actual processing factors, thereby reducing the difficulty of processing. For example, the value of BC can also be 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm, etc., which are not listed here one by one.

[0042] In one embodiment, if Figure 1As shown, the valve seat assembly 10 includes a main valve seat 11 and a first valve seat core 12. The main valve seat 11 defines a mounting hole 104. The first valve seat core 12 is located at the mounting hole 104 and is connected to the main valve seat 11. A valve cavity 101 is defined in the main valve seat 11, and a valve port 102 is defined in the first valve seat core 12. The portion of the first valve seat core 12 located within the valve cavity 101 forms a flow guide 121. By configuring the valve seat assembly 10 as a separate structure of the main valve seat 11 and the first valve seat core 12, the difficulty in machining structures such as the flow guide 121 and the valve port 102 can be effectively reduced, thereby improving machining accuracy and further enhancing the performance of the electronic expansion valve 100.

[0043] Furthermore, the valve seat assembly 10 also includes a second valve seat core 13, which is disposed outside the valve cavity 101 and connected to the first valve seat core 12. The first valve seat core 12 defines a first channel 105, and the second valve seat core 13 defines a second channel 106. The valve port 102, the first channel 105, and the second channel 106 are coaxially arranged. Along the axial direction of the valve port 102, the channel diameters of the valve port 102, the first channel 105, and the second channel 106 remain consistent and equal. This extends the length of the flow channel behind the valve port 102. Furthermore, because the channel diameter formed by the first channel 105 and the second channel 106 remains unchanged, the pressure of the refrigerant in this channel is stable and does not experience significant pressure fluctuations. This prevents bubbles in the gas-liquid two-phase refrigerant fluid after throttling from bursting and generating noise. Furthermore, the increased length of the flow channel behind the valve port 102 reduces the velocity gradient of the refrigerant fluid, effectively reducing refrigerant pressure pulsation and noise.

[0044] Of course, in other embodiments, the main valve seat 11 , the first valve seat core 12 and the second valve seat core 13 may also be provided as an integrated structure, as long as they can play the same role.

[0045] In one embodiment, if Figure 1 As shown, the electronic expansion valve 100 also includes a nut 50, which is fixedly mounted on the valve seat assembly 10. The nut 50 includes a threaded section 51 and a guide section 52. The valve needle assembly 20 is inserted into the nut 50, and the valve needle assembly 20 is threadedly engaged with the threaded section 51 and is movable and guided by the guide section 52. The threaded engagement between the nut 50 and the valve needle assembly 20 converts circumferential rotation of the valve needle assembly 20 into linear motion along the axial direction of the valve port 102, thereby facilitating engagement between the valve needle assembly 20 and the valve port 102 and achieving control of the refrigerant flow rate.

[0046] Furthermore, in one embodiment, the guide segment 52 includes an upper guide segment 521 and a lower guide segment 522. The upper guide segment 521 and the lower guide segment 522 are respectively disposed on either side of the threaded segment 51 along the axial direction of the valve port 102. Both the upper guide segment 521 and the lower guide segment 522 are clearance-matched with the outer wall of the valve needle assembly 20 to guide the valve needle assembly 20. This improves the guiding effect of the nut 50 on the valve needle assembly 20. Furthermore, the present invention uses a single nut 50 to simultaneously guide the upper and lower portions of the valve needle assembly 20. Compared to a structure in which the upper portion is guided by the nut 50 and the lower portion by a guide sleeve, this configuration avoids errors caused by the assembly of the guide sleeve, ensuring the coaxiality of the components. Furthermore, the reduced number of components can reduce the cost of the electronic expansion valve 100.

[0047] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. An electronic expansion valve, comprising a valve seat assembly (10) and a valve needle assembly (20), wherein the valve seat assembly (10) is provided with a valve cavity (101) and a valve port (102), and the valve needle assembly (20) is movably mounted in the valve cavity (101) for adjusting the flow at the valve port (102); It is characterized by: The valve seat assembly (10) is provided with a guide portion (121) at the valve port (102), and a guide hole (103) is provided on the guide portion (121) for connecting the valve cavity (101) and the valve port (102), wherein the intersection lines formed by the side walls of the guide hole (103) and any plane passing through the axis of the valve port (102) are all arranged in a continuous straight line or curve, and the bottom wall of the guide hole (103) close to one end of the valve port (102) extends along the radial direction of the valve port (102) and is arranged around the circumference of the valve port (102).

2. The electronic expansion valve according to claim 1, characterized in that: The side wall of the guide hole (103) extends in a columnar or conical shape.

3. The electronic expansion valve according to claim 2, characterized in that: The side wall of the guide hole (103) extends in a cone shape, and the cone angle A satisfies 0<A≤80°.

4. The electronic expansion valve according to claim 1, characterized in that: A first connecting pipe (30) is connected and communicated with the outer peripheral wall of the valve seat assembly (10); along the axial direction of the valve port (102), the end surface of the guide portion (121) away from the valve port (102) is not lower than the side of the inner peripheral wall of the first connecting pipe (30) close to the valve port (102).

5. The electronic expansion valve according to claim 4, characterized in that: Along the axial direction of the valve port (102), the distance from the end face of the guide portion (121) away from one end of the valve port (102) to the bottom wall of the valve cavity (101) is B, and the shortest distance from the inner wall of the first connecting pipe (30) close to the valve port (102) to the bottom wall of the valve cavity (101) is C, wherein B and C satisfy 0≤BC≤0.5mm.

6. The electronic expansion valve according to claim 1, characterized in that: Along the axial direction of the valve port (102), the bottom wall of the guide hole (103) is not lower than the bottom wall of the valve cavity (101).

7. The electronic expansion valve according to claim 1, characterized in that: The inner diameter of the valve port (102) is D, and the inner diameter of the bottom wall of the guide hole (103) is E, wherein D and E satisfy E≥1.5D.

8. The electronic expansion valve according to any one of claims 1 to 7, characterized in that: The valve seat assembly (10) comprises a main valve seat (11) and a first valve seat core (12); the main valve seat (11) is provided with a mounting hole (104); the first valve seat core (12) is arranged at the location of the mounting hole (104) and is connected to the main valve seat (11); The valve cavity (101) is opened in the main valve seat (11), the valve port (102) is opened in the first valve seat core (12), and the portion of the first valve seat core (12) located in the valve cavity (101) forms the guide portion (121).

9. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further comprises a nut (50), wherein the nut (50) is fixedly mounted on the valve seat assembly (10); The nut (50) includes a threaded section (51) and a guide section (52), the valve needle assembly (20) is inserted into the nut (50), and the valve needle assembly (20) is threadedly engaged with the threaded section (51) and is movably guided by the guide section (52).

10. The electronic expansion valve according to claim 9, characterized in that: The guide section (52) includes an upper guide section (521) and a lower guide section (522), and the upper guide section (521) and the lower guide section (522) are respectively arranged on both sides of the threaded section (51) along the axial direction of the valve port (102), and the upper guide section (521) and the lower guide section (522) are both fitted with a clearance of the outer wall of the valve needle assembly (20) to guide the valve needle assembly (20).

Images