Electronic expansion valve and refrigeration apparatus

Abstract

The utility model discloses an electronic expansion valve and refrigeration plant relates to electronic expansion valve technical field, wherein, the electronic expansion valve includes the valve core structure, the valve core structure includes first valve needle and second valve needle, and first valve needle is equipped with first valve mouth, the aperture and the mobile channel of intercommunication first valve mouth with aperture, and second valve needle includes the nut seat and valve needle body who are connected, valve needle body is movable and is located in mobile channel, is used to close or open first valve mouth, nut seat is adapted to wear and is located in aperture, and the cross section shape of nut seat is non -circular, the technical scheme that the utility model provides can improve the assembly convenience of nut seat.

Description

Technical Field

[0001] This utility model relates to the field of electronic expansion valve technology, and in particular to an electronic expansion valve and a refrigeration device. Background Technology

[0002] The electronic expansion valve is an important component in an air conditioning refrigeration system, primarily serving to throttle and reduce pressure and regulate flow. A typical electronic expansion valve includes a valve needle assembly and a moving channel for the valve needle assembly to move up and down. The valve needle assembly includes a nut connected to a transmission rod. However, the channel wall obstructs the operator's view, hindering the convenient installation of the nut. Utility Model Content

[0003] The main purpose of this invention is to provide an electronic expansion valve and a refrigeration device, which aims to improve the ease of assembly of the nut seat.

[0004] To achieve the above objectives, the present invention proposes an electronic expansion valve, which includes a valve core structure; the valve core structure includes:

[0005] A first valve needle is provided with a first valve port, an opening, and a moving channel connecting the first valve port and the opening; and

[0006] The second valve needle includes a nut seat and a valve needle body connected together. The valve needle body is movably disposed in the moving channel to close or open the first valve port. The nut seat is adapted to pass through the opening, and the cross-sectional shape of the nut seat is non-circular.

[0007] In one embodiment, the nut seat is elongated cylindrical, and the opening is an elongated hole.

[0008] In one embodiment, the nut seat includes a transmission nut, the transmission nut including a main body section and a guide section, the main body section being connected to the valve needle body, the guide section having a diameter of D1, the main body section having a diameter of D2, and D1 < D2.

[0009] In one embodiment, the nut seat further includes a connecting limiting sleeve, through which the transmission nut is connected to the valve needle body.

[0010] In one embodiment, the connecting limiting sleeve includes a connecting section and a limiting section connected to each other. The transmission nut is connected to the valve needle body through the connecting section. The limiting section protrudes from the outer peripheral surface of the connecting section and protrudes from the outer peripheral surface of the transmission nut. The limiting section is used to abut against the edge of the opening.

[0011] And / or, the transmission nut is a plastic part;

[0012] And / or, the connecting limiting sleeve is a metal part.

[0013] In one embodiment, the first valve needle is provided with a first balance hole communicating with the moving channel, the first balance hole axially penetrating the first valve needle, and the nut seat is provided with a clearance groove to avoid the first balance hole.

[0014] In one embodiment, an exhaust groove is provided at the connection position between the valve needle body and the nut seat, and the exhaust groove communicates with the inner cavity of the nut seat and the moving channel.

[0015] In one embodiment, the first valve needle includes an upper valve needle cylinder and a lower valve needle seat. The upper valve needle cylinder is provided with the opening, and the lower valve needle seat is provided with the first valve port and has a supporting step formed on its outer peripheral surface. The upper valve needle cylinder covers the lower valve needle seat and is supported by the supporting step.

[0016] In one embodiment, the upper valve syringe includes a barrel body and a stop section, the barrel body and the stop section are connected to form a limiting step, the limiting step is used to limit the engagement with the valve seat structure of the electronic expansion valve, and the stop section abuts against the supporting step.

[0017] In one embodiment, the outer diameter of the cylinder body is smaller than the outer diameter of the stop section, and the outer diameter of the stop section is equal to the outer diameter of the support step;

[0018] And / or, the outer surface of the cylinder is provided with an installation groove for installing the first sealing ring, the first sealing ring is in sealing contact with the channel wall of the valve seat structure, and the outer surface of the first sealing ring is also provided with a lubricating coating.

[0019] In one embodiment, the lower valve needle seat is further provided with a side hole penetrating its side wall, and the side hole communicates with the first valve port.

[0020] In one embodiment, the valve needle body is provided with an installation groove for installing a second sealing ring, the second sealing ring is in sealing contact with the channel wall of the moving channel, and a lubricating coating is also provided on the outside of the second sealing ring.

[0021] In one embodiment, the electronic expansion valve further includes a valve seat structure, the valve seat structure having a movable cavity and a second valve port, the first valve needle being movably disposed between the movable cavity and the second valve port to open or close the second valve port, the first valve port being disposed on the end face of the first valve needle blocking the second valve port and communicating with the second valve port.

[0022] In one embodiment, the valve seat structure includes a bearing seat, the bearing seat having a receiving cavity and an inner ring opening communicating with the receiving cavity, and the nut seat being adapted to pass through the inner ring opening of the bearing seat and being drivenly connected to the transmission rod in the receiving cavity.

[0023] In one embodiment, a spring is connected between the first valve needle and the bearing housing.

[0024] In one embodiment, the bearing housing is further provided with a second balance hole communicating with the movable cavity, the second balance hole axially penetrating the bearing housing.

[0025] In one embodiment, the bearing housing is further provided with a side-opening vent hole communicating with the receiving cavity.

[0026] In one embodiment, an elastic seal is provided between the lower edge of the first valve needle and the second valve port.

[0027] This utility model also proposes a refrigeration device, including the aforementioned electronic expansion valve.

[0028] In the technical solution of this utility model, the cross-sectional shape of the nut seat is designed to be non-circular and can be adapted to pass through the opening. At this time, the shape of the opening is also non-circular. Compared with the nut seat being set in the moving channel as a whole and using a corresponding anti-rotation structure to prevent the nut seat from rotating relative to the first valve needle, the nut seat with a non-circular cross-sectional shape is adapted to the opening. This can effectively prevent the second valve needle from rotating significantly inside the first valve needle while simplifying the structure of the first and second valve needles, thereby improving the driving efficiency of the second and first valve needles. It also makes it convenient for the nut seat to quickly pass through the opening and ensures the accurate assembly of the second valve needle in the moving channel, thereby realizing reliable control of the opening and closing of the first valve port and ensuring convenient installation of the nut seat. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 A cross-sectional view of an embodiment of the electronic expansion valve provided by this utility model;

[0031] Figure 2 for Figure 1 Cross-sectional view of the valve core structure and valve seat structure;

[0032] Figure 3 for Figure 2 A cross-sectional view of the valve core structure;

[0033] Figure 4 A cross-sectional view of the valve core structure and valve seat structure of an electronic expansion valve, cut along another section line;

[0034] Figure 5 for Figure 4 A cross-sectional view of the valve core structure;

[0035] Figure 6 This is a sectional view of the base in the valve seat structure;

[0036] Figure 7 This is a cross-sectional view of the fit between the bearing housing and the transmission rod in the valve seat structure.

[0037] Figure 8 This is a schematic diagram of the nut seat structure;

[0038] Figure 9 This is a side view of the nut seat;

[0039] Figure 10 This is a schematic diagram of the upper valve syringe.

[0040] Explanation of icon numbers:

[0041] 10. First valve needle; 101. First valve port; 102. Opening; 103. Moving channel; 104. First balance hole; 11. Upper valve needle cylinder; 111. Cylinder body; 112. Stop section; 113. Limiting step; 114. First mounting groove; 12. Lower valve needle seat; 121. Supporting step; 122. Side hole; 13. First sealing ring; 14. Elastic seal;

[0042] 20. Second valve needle; 21. Nut seat; 211. Transmission nut; 2111. Main body section; 2112. Guide section; 212. Connecting limit sleeve; 2121. Connecting section; 2122. Limiting section; 2123. Clearance groove; 22. Valve needle body; 221. Exhaust groove; 222. Second mounting groove; 223. Locking protrusion; 224. Limiting protrusion ring; 23. Second sealing ring;

[0043] 30. Valve seat structure; 301. Moving cavity; 302. Second valve port; 303. Stop surface; 31. Bearing seat; 311. Inner ring port; 312. Second balance hole; 313. Side-opening vent hole; 314. Annular boss; 315. Receiving cavity; 32. Spring; 33. Bearing; 34. Bearing sleeve;

[0044] 40. Drive rod; 50. Rotor assembly; 60. Coil.

[0045] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0047] It should be noted that if the embodiments of this utility model 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 specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0048] Furthermore, if the embodiments of this utility model 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 use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, 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. When 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 utility model.

[0049] The electronic expansion valve is an important component in an air conditioning refrigeration system, primarily serving to throttle and reduce pressure and regulate flow. A typical electronic expansion valve includes a valve needle assembly and a moving channel for the valve needle assembly to move up and down. The valve needle assembly includes a nut connected to a transmission rod. However, the channel wall obstructs the operator's view, hindering the convenient installation of the nut.

[0050] To solve this technical problem, this utility model proposes an electronic expansion valve, which can be specifically applied to the air conditioning system of new energy vehicles.

[0051] Please see Figures 1 to 10In one embodiment of this utility model, the electronic expansion valve includes a valve core structure; the valve core structure includes a first valve needle 10 and a second valve needle 20. The first valve needle 10 is provided with a first valve port 101, an opening 102, and a moving channel 103 connecting the first valve port 101 and the opening 102; the second valve needle 20 includes a nut seat 21 and a valve needle body 22 connected to each other. The valve needle body 22 is movably disposed in the moving channel 103 to close or open the first valve port 101. The nut seat 21 is adapted to pass through the opening 102, and the cross-sectional shape of the nut seat 21 is non-circular; thereby improving the assembly convenience of the nut seat 21.

[0052] In the technical solution of this utility model, the cross-sectional shape of the nut seat 21 is designed to be non-circular and can be adapted to pass through the opening 102. At this time, the shape of the opening 102 is also non-circular. Compared with the nut seat 21 being set in the moving channel 103 and using a corresponding anti-rotation structure to prevent the nut seat 21 from rotating relative to the first valve needle 10, the nut seat 21 with a non-circular cross-sectional shape is adapted to the opening 102. This can effectively prevent the second valve needle 20 from rotating significantly inside the first valve needle 10 while simplifying the structure of the first valve needle 10 and the second valve needle 20. This improves the driving efficiency of the second valve needle 20 and the first valve needle 10, and also facilitates the nut seat 21 to quickly pass through the opening 102. At the same time, it facilitates the accurate assembly of the second valve needle 20 in the moving channel 103, thereby realizing reliable control of the opening and closing of the first valve port 101 and ensuring the convenient installation of the nut seat 21.

[0053] It should be noted that the electronic expansion valve proposed in this utility model is a dual-needle electronic expansion valve. The first valve needle 10 is a large valve needle, and the second valve needle 20 is a small valve needle. It can be understood that the large valve needle is the main valve with a longer stroke, responsible for regulating the flow over a wide range; the small valve needle is the auxiliary valve with a shorter stroke, responsible for fine regulation of the flow over a small range; thus, by coordinating the work of the large and small valve needles, high-precision regulation of the flow can be achieved.

[0054] The electronic expansion valve also includes a valve seat structure 30 and a drive device. The valve seat structure 30 is provided with a movable cavity 301 for mounting the first valve needle 10 and a second valve port 302 communicating with the movable cavity 301. The first valve needle 10 can open or close the second valve port 302. The drive device includes a transmission rod 40, a rotor assembly 50, and a coil 60. The lower end of the transmission rod 40 is threadedly connected to the nut seat 21 and is movably mounted on the transmission rod 40 to ensure normal driving of the second valve needle 20. Since the nut seat 21 is movably adapted to fit through the opening 102, the nut seat 21 can move axially up and down relative to the first valve needle 10, thereby improving the smoothness of the movement of the second valve needle 20. The upper end of the transmission rod 40 is laser-welded to the rotor assembly 50. By applying a certain regular electrical pulse to the coil 60, the rotor assembly 50 is excited to drive the transmission rod 40 to rotate, which in turn drives the nut seat 21 to move up and down, thereby driving the valve needle body 22 and the first valve needle 10 to move up and down, thereby regulating the flow through the first valve port 101 and the second valve port 302.

[0055] Please see Figures 8 to 10 In this embodiment of the invention, the nut seat 21 is elongated cylindrical, and the opening 102 is an elongated oval hole. Thus, when passing the nut seat 21 through the opening 102, it is only necessary to align the insertion channel 103 of the nut seat 21 with the end face of the opening 102, and rotate the nut seat 21 until it is aligned with the opening 102 to achieve accurate insertion. This avoids the difficulty in passing the nut seat 21 through the opening 102 and inaccurate assembly position caused by the view being blocked by the outer wall of the first valve needle 10 during assembly. Furthermore, the nut seat 21 and the opening 102 are clearance-fitted, ensuring smooth up-and-down movement of the nut seat 21 under the drive of the transmission rod 40. However, this design is not limited to this; in other embodiments, the cross-sectional shape of the nut seat 21 includes, but is not limited to, elliptical, triangular, rectangular, polygonal, and heart-shaped shapes.

[0056] Further, in an embodiment of this utility model, the nut seat 21 includes a transmission nut 211, the transmission nut 211 includes a main body section 2111 and a guide section 2112, the main body section 2111 is connected to the valve needle body 22, the diameter of the guide section 2112 is D1, the diameter of the main body section 2111 is D2, D1 < D2, as shown. Figure 8 and Figure 9 As shown, when the nut seat 21 abuts against the end face where the opening 102 is located, the guide section 2112 abuts first. Combined with the design that the diameter of the guide section 2112 is smaller than the diameter of the main body section 2111, the nut seat 21 can be more easily installed into the opening 102 through the setting of the guide section 2112, thereby improving the assembly efficiency and assembly convenience of the nut seat 21.

[0057] Please see Figures 1 to 5In an embodiment of this utility model, the nut seat 21 further includes a connecting limiting sleeve 212. The transmission nut 211 is connected to the valve needle body 22 through the connecting limiting sleeve 212. It can be understood that by using the connecting limiting sleeve 212 to install the valve needle body 22 onto the transmission nut 211, valve needle bodies 22 of different specifications can be fixed onto the transmission nut 211. Thus, in the production process, only one specification of transmission nut 211 can be produced. By using the connecting limiting sleeve 212 to load valve needle bodies 22 of different specifications, different sizes of first valve ports 101 can be adapted to achieve different flow regulation effects, thereby improving the versatility of the second valve needle 20 and reducing production costs.

[0058] Please see Figure 3 In an embodiment of this utility model, the connecting limiting sleeve 212 includes a connecting section 2121 and a limiting section 2122 connected together. The transmission nut 211 is connected to the valve needle body 22 through the connecting section 2121. The limiting section 2122 protrudes from the outer peripheral surface of the connecting section 2121 and extends beyond the outer peripheral surface of the transmission nut 211. The limiting section 2122 abuts against the edge of the opening 102. Thus, firstly, the outer diameter of the limiting section 2122 is larger than the outer diameter of the transmission nut 211, which facilitates the abutment of the limiting section 2122 against the edge of the opening 102, thereby preventing the transmission nut 211 from detaching from the opening 102. First valve needle 10; secondly, after the limiting section 2122 abuts against the edge of the opening 102, the nut seat 21 continues to move away from the first valve port 101, and the nut seat 21 will drive the first valve needle 10 to move away from the second valve port 302, thereby realizing the control of the opening degree of the second valve port 302; thirdly, the limiting section 2122 protrudes from the outer peripheral surface of the connecting section 2121. When the connecting section 2121 is inserted into the transmission nut 211, the limiting section 2122 can limit the axial position of the connecting limiting sleeve 212 to avoid axial displacement of the connecting limiting sleeve 212 relative to the transmission nut 211, that is, to limit the axial displacement of the valve needle body 22. However, this design is not limited to this. In other embodiments, the connecting limiting sleeve 212 only includes the connecting section 2121, and the outer peripheral surface of the main body section 2111 of the transmission nut 211 is provided with the limiting section 2122 to abut against the edge of the opening 102.

[0059] The transmission nut 211 is made of plastic, which helps reduce the weight of the nut seat 21, lowers costs, and ensures the stability and durability of the transmission nut 211 during long-term operation. It also facilitates the installation of an internal thread within the transmission nut 211 to mate with the transmission rod 40. The connection methods between the transmission nut 211 and the connecting limiting sleeve 212 include, but are not limited to, insert molding, threaded connection, and convex-concave fit.

[0060] The connecting limiting sleeve 212 is a metal part, which helps to ensure the assembly reliability of the valve needle body 22 on the transmission nut 211 and improves the overall structural strength of the second valve needle 20. The connection methods between the connecting limiting sleeve 212 and the valve needle body 22 include, but are not limited to, laser welding, snap-fitting, bonding, and threaded connection. Specifically, as follows Figure 3 As shown, the connecting limiting sleeve 212 has a communicating groove and a limiting ring groove. One end of the valve needle body 22 includes a retaining protrusion 223 and a limiting protrusion 224. The retaining protrusion 223 is located in the groove, and the limiting protrusion 224 protrudes from the outer circumferential surface of the retaining protrusion 223 and is at least partially located in the limiting ring groove. Alternatively, the connecting limiting sleeve 212 has a groove and a limiting protrusion located on the groove wall. One end of the valve needle body 22 includes the retaining protrusion 223, which is located in the groove, and its end abuts against the limiting protrusion, thus completing the connection between the valve needle body 22 and the connecting limiting sleeve 212, while simultaneously restricting the axial displacement of the valve needle body 22 relative to the connecting limiting sleeve 212. Furthermore, the valve needle body 22 and the connecting limiting sleeve 212 can be fixed by laser welding to further enhance the connection strength between them.

[0061] Please see Figure 2 In an embodiment of this utility model, the first valve needle 10 is provided with a first balance hole 104 communicating with the moving channel 103. The first balance hole 104 axially penetrates the first valve needle 10. The nut seat 21 is provided with a relief groove 2123 to avoid the first balance hole 104. Thus, by setting the first balance hole 104, the air pressure inside the moving channel 103 and outside the first valve needle 10 can be balanced, reducing the additional resistance caused by the air pressure difference, ensuring that the second valve needle 20 works in a relatively stable pressure environment, thereby reducing wear, improving the life and reliability of the second valve needle 20, and improving the smoothness and accuracy of the movement of the second valve needle 20, thereby improving the flow regulation accuracy and response speed of the electronic expansion valve.

[0062] Because the cross-sectional shape of the nut seat 21 is non-circular, when the nut seat 21 is fitted into the opening 102, the nut seat 21 connects to the first balance hole 104 through the end face of the opening 102 via the clearance groove 2123, ensuring that when the limiting section 2122 of the nut seat 21 abuts against the edge of the opening 102, the limiting section 2122 will not block the first balance hole 104.

[0063] Please see Figures 2 to 3In an embodiment of this utility model, an exhaust groove 221 is provided at the connection position between the valve needle body 22 and the nut seat 21. The exhaust groove 221 connects the inner cavity of the nut seat 21 and the moving channel 103. It can be understood that the valve needle body 22 has an insertion part that inserts into the inner cavity of the nut seat 21. One side of the insertion part is provided with a flat opening so that when the insertion part is inserted into the inner cavity, it can define the exhaust groove 221 connecting the inner cavity of the nut seat 21 and the moving channel 103 with the hole wall of the inner cavity. Specifically, when the valve needle body 22 includes a locking protrusion 223 and a limiting protrusion 224, the flat opening extends from the locking protrusion 223 to the limiting protrusion 224. The locking protrusion 223 and the limiting protrusion 224 extend into the inner cavity of the nut seat 21, specifically into the locking groove of the connecting limiting sleeve 212. When the limiting ring groove is formed, an exhaust groove 221 is formed between the wall of the flat opening and the wall of the inner cavity. This simplifies the mold for the transmission nut 211 compared to opening an exhaust hole on the side of the transmission nut 211, eliminating the need for a side core-pulling structure to meet the pressure balance requirements, thus reducing mold manufacturing costs. Furthermore, since the exhaust groove 221 is located at the connection between the valve needle body 22 and the nut seat 21, the refrigerant and refrigeration oil entering the valve body during the operation of the electronic expansion valve, along with their impurities, will not clog the exhaust groove 221. This helps prevent the exhaust groove 221 from failing to balance the internal pressure of the transmission nut 211, thereby improving the smoothness and accuracy of the second valve needle 20's movement, and ultimately improving the flow regulation accuracy and response speed of the electronic expansion valve. However, this design is not limited to this. In other embodiments, the flat opening is located on the inner cavity wall of the nut seat 21, specifically on the groove wall connecting the limiting sleeve 212 and the limiting ring groove.

[0064] Please see Figures 2 to 4 In an embodiment of this utility model, the first valve needle 10 includes an upper valve needle cylinder 11 and a lower valve needle seat 12. The upper valve needle cylinder 11 is provided with the opening 102, and the lower valve needle seat 12 is provided with the first valve port 101, and its outer peripheral surface forms a support step 121. The upper valve needle cylinder 11 covers the lower valve needle seat 12 and is supported by the support step 121. Thus, in the process of assembling the electronic expansion valve, the nut seat 21 and the valve needle body 22 are first fixed into a whole, and the valve needle body 22 is inserted into the first valve port 101 of the lower valve needle seat 12. Then, the upper valve needle cylinder 11 is covered onto the nut seat 21, so that the nut seat 21 abuts against the end face where the opening 102 is located. The nut seat 21 is rotated until it is aligned with the opening 102, so that the nut seat 21 passes through the opening 102. Finally, the upper valve needle cylinder 11 is fixed on the support step 121 to complete the assembly.

[0065] Specifically, in an embodiment of this utility model, the upper valve syringe 11 includes a syringe body 111 and a stop section 112. The syringe body 111 and the stop section 112 are connected to form a limiting step 113. The limiting step 113 is used to limit the engagement with the valve seat structure 30 of the electronic expansion valve. The stop section 112 abuts against the support step 121. In this way, the upper valve syringe 11 and the lower valve needle seat 12 can have a larger effective contact area, improving the connection strength between the upper valve syringe 11 and the lower valve needle seat 12. At the same time, it can accommodate the diameter difference between the upper valve syringe 11 and the lower valve needle seat 12. It can also form a limiting step 113 that abuts against the stop surface 303 in the valve seat structure 30, thereby reliably constraining the movement of the first valve needle 10. That is, the first valve needle 10 cannot continue to move away from the second valve port 302, thus realizing the movement control of the first valve needle 10.

[0066] In this design, the upper valve needle cylinder 11 and the lower valve needle seat 12 are abutted and press-fitted together, and then fixed together by laser welding. The outer diameter of the cylinder body 111 is smaller than the outer diameter of the stop section 112, and the outer diameter of the stop section 112 is equal to the outer diameter of the support step 121. Figure 3 As shown, the outer diameter of the cylinder body 111 is D3, and the outer diameters of the stop section 112 and the support step 121 are both D4. Since D3 is smaller than D4, it not only forms a limiting step 113 that abuts against the stop surface 303 within the valve seat structure 30, thus constraining the movement path, but also facilitates increasing the size of the second valve port 302 that mates with the lower valve needle seat 12, enabling wide-range flow regulation. Simultaneously, the support step 121 reliably supports the stop section 112, improving its structural strength and reducing the possibility of cracks or even breakage due to collision with the stop surface 303. However, this design is not limited to this; in other embodiments, the outer diameter of the support step 121 can be larger than the outer diameter of the stop section 112.

[0067] Furthermore, it facilitates the sliding engagement between the cylinder body 111 and the moving cavity 301 within the valve seat structure 30 for the movement of the first valve needle 10. Specifically, in the embodiment of this utility model, the cylinder body 111 is provided with a first mounting groove 114 for the installation of the first sealing ring 13. The first sealing ring 13 is sealed against the channel wall of the valve seat structure 30. The first sealing ring 13 is also provided with a lubricating coating. Thus, by providing a lubricating coating, the coefficient of friction between the first sealing ring 13 and the cavity wall of the moving cavity 301 can be significantly reduced, reducing energy loss caused by friction, extending the service life of the first sealing ring 13, and maintaining the reliability of the seal under dynamic sealing conditions, thereby reducing the risk of leakage.

[0068] Please see Figures 4 to 5In an embodiment of this utility model, the lower valve needle seat 12 is further provided with a side hole 122 penetrating its side wall. The side hole 122 is connected to the first valve port 101. Thus, the side hole 122 is connected to the through hole on the valve seat structure 30. When the second valve needle 20 moves away from the first valve port 101 and opens the first valve port 101, the medium enters through the first valve port 101 because the first valve port 101 is connected to the side hole 122. Then, it flows out of the electronic expansion valve through the side hole 122 and the through hole in sequence, thereby realizing the adjustment of the flow rate within a small range.

[0069] Since the first balance hole 104 axially penetrates the first valve needle 10, the lower valve needle seat 12 forms a portion of the first balance hole 104 to connect the second valve port 302 and the moving channel 103. The first balance hole 104 is not connected to the side hole 122. In the embodiment of this utility model, the valve needle body 22 is provided with a second mounting groove 222 for the installation of the second sealing ring 23. The second sealing ring 23 is sealed and abuts against the channel wall of the moving channel 103. The second sealing ring 23 is also provided with a lubricating coating. Thus, when the second valve needle 20 closes the first valve port 101, the moving channel 103 forms a relatively sealed chamber between the first valve port 101 and the second sealing ring 23. At the same time, by providing a lubricating coating, the coefficient of friction between the second sealing ring 23 and the channel wall of the moving channel 103 can be significantly reduced, reducing energy loss caused by friction, extending the service life of the second sealing ring 23, and maintaining the reliability of the seal under dynamic sealing conditions, reducing the risk of leakage, so that the medium flowing into the first valve port 101 flows from the side hole 122 to the through hole.

[0070] Please see Figure 1 , Figure 3 and Figure 4 In an embodiment of this utility model, the electronic expansion valve further includes a valve seat structure 30, which has a movable cavity 301 and a second valve port 302. The first valve needle 10 is movably disposed between the movable cavity 301 and the second valve port 302 to open or close the second valve port 302. The first valve port 101 is disposed on the end face of the first valve needle 10 that blocks the second valve port 302 and communicates with the second valve port 302.

[0071] Specifically, the electronic expansion valve also includes a drive device, which includes a transmission rod 40 that is tractively connected to the nut seat 21 to drive the second valve needle 20 to move within the moving channel 103 to open or close the first valve port 101. When the limiting section 2122 of the nut seat 21 abuts against the edge of the opening 102, the first valve needle 10 is driven to move within the moving cavity 301 to open or close the second valve port 302.

[0072] The first valve needle 10 has a first valve port 101 on the end face that blocks the second valve port 302. When the medium enters the second valve port 302, and the second valve needle 20 opens the first valve port 101 while the first valve needle 10 blocks the second valve port 302, the medium enters the moving channel 103 through the first valve port 101, flows out of the valve core structure through the side hole 122, and flows out of the electronic expansion valve through the through hole of the valve seat structure 30. When the first valve needle 10 opens the second valve port 302, the medium also enters the moving cavity 301 through the second valve port 302, and flows out of the electronic expansion valve through the through hole of the valve seat structure 30.

[0073] Please see Figure 2 In an embodiment of this utility model, the valve seat structure 30 includes a bearing seat 31. The bearing seat 31 is provided with a receiving cavity 315 and an inner ring opening 311 communicating with the receiving cavity 315. The nut seat 21 is adapted to pass through the inner ring opening 311 of the bearing seat 31 and is connected to the transmission rod 40 in the receiving cavity 315. Since the cross-sectional shape of the nut seat 21 is non-circular, the inner ring opening 311 is also non-circular. This can effectively prevent the second valve needle 20 from rotating significantly at the inner ring opening 311 while simplifying the structure of the bearing seat 31 and the second valve needle 20, thereby improving the driving efficiency of the second valve needle 20 and the first valve needle 10. It also facilitates the quick installation of the nut seat 21 into the inner ring opening 311, improving the assembly convenience of the nut seat 21 on the bearing seat 31, and thus facilitating the connection between the nut seat 21 and the transmission rod 40.

[0074] Optionally, in an embodiment of this utility model, a spring 32 is connected between the first valve needle 10 and the bearing seat 31. This prevents the first valve needle 10 from approaching the bearing seat 31, reducing the possibility of collision between the first valve needle 10 and the bearing seat 31. The spring 32 is fitted onto the transmission nut 211 of the nut seat 21, with one end abutting against the bearing seat 31 and the other end abutting against the end face of the first valve needle 10 facing the bearing seat 31. Further, the end face of the bearing seat 31 facing the first valve needle 10 is provided with an annular boss 314. An annular boss 314 is positioned around the outside of the nut seat 21, and a spring 32 is fitted around its outer side. Thus, the annular boss 314 limits the spring 32, ensuring that the spring 32 remains coaxial with the first valve needle 10 and the second valve needle 20 throughout the entire working process. This prevents the first valve needle 10 from experiencing eccentric thrust from the spring 32 during operation, which could lead to unilateral wear of the first valve needle 10 and affect its sealing performance. This thrust is generated by the radial movement of the spring 32, thereby improving the smoothness of the movement of the first valve needle 10 and extending its service life. However, this design is not limited to this. In other embodiments, the annular boss 314 can be located on the end face of the upper valve needle cylinder 11 facing the bearing seat 31, or both the bearing seat 31 and the upper valve needle cylinder 11 can be provided with annular bosses 314.

[0075] Please see Figure 2 In an embodiment of this utility model, the bearing seat 31 is further provided with a second balance hole 312 communicating with the moving cavity 301. The second balance hole 312 axially penetrates the bearing seat 31. It can be understood that the valve seat structure 30 includes a base and a bearing seat 31, as shown below. Figure 6 and Figure 7 As shown, the base is provided with a second valve port 302 and a stop surface 303. The bearing seat 31 is fixed to the end of the base away from the second valve port 302, and together with the base, forms a moving cavity 301. The end of the bearing seat 31 away from the base can be fixed with a bearing 33 by means of riveting, etc. The bearing is fixedly connected by laser welding after being tightly fitted with the transmission rod 40 by the bearing sleeve 34. Since the first valve needle 10 slides with the base, and a first sealing ring 13 is provided between the first valve needle 10 and the base, the air pressure inside the moving cavity 301 and the outside of the valve seat structure 30 can be balanced by providing a second balance hole 312 on the bearing seat 31 that connects to the moving cavity 301. This reduces the additional resistance caused by the air pressure difference, ensures that the first valve needle 10 works in a relatively stable pressure environment, thereby reducing wear, improving the life and reliability of the first valve needle 10, and improving the smoothness and accuracy of the movement of the first valve needle 10, thereby improving the flow regulation accuracy and response speed of the electronic expansion valve.

[0076] Please see Figure 2 In an embodiment of this utility model, the bearing seat 31 is further provided with a side-opening vent 313 communicating with the receiving cavity 315. It can be understood that since the transmission between the nut seat 21 and the transmission rod 40 is located within the receiving cavity 315 of the bearing seat 31, by providing a side-opening vent 313 communicating with the receiving cavity 315 on the bearing seat 31, the air pressure inside the receiving cavity 315 and outside the bearing seat 31 can be balanced, reducing the additional resistance caused by the air pressure difference, ensuring that the nut seat 21 works in a relatively stable pressure environment, thereby reducing wear, improving the life and reliability of the nut seat 21, and improving the smoothness and accuracy of the movement of the nut seat 21, thereby improving the flow regulation accuracy and response speed of the electronic expansion valve.

[0077] Please see Figures 1 to 5In this embodiment of the present invention, an elastic seal 14 is provided between the lower edge of the first valve needle 10 and the second valve port 302. When a small-range flow adjustment is required, the first valve needle 10 closes the second valve port 302. By providing the elastic seal 14 at the lower edge of the first valve needle 10, the impact force generated by the first valve needle 10 closing the second valve port 302 can be buffered, protecting the first valve needle 10 and the second valve port 302. This impact force can be generated at least by the spring 32. Furthermore, it can improve the sealing reliability of closing the second valve port 302, thereby ensuring that the medium flows only from the first valve port 101 to the through hole of the valve seat structure 30 and out of the electronic expansion valve. The elastic seal 14 can be an elastic overmolded material, which is applied to the lower edge surface of the first valve needle 10 through injection molding.

[0078] This utility model also proposes a refrigeration device, which includes an electronic expansion valve. The specific structure of the electronic expansion valve is as described in the above embodiments. Since this refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0079] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. An electronic expansion valve, characterized in that, The electronic expansion valve includes a valve core structure; the valve core structure includes: A first valve needle is provided with a first valve port, an opening, and a moving channel connecting the first valve port and the opening; and The second valve needle includes a nut seat and a valve needle body connected together. The valve needle body is movably disposed in the moving channel to close or open the first valve port. The nut seat is adapted to pass through the opening, and the cross-sectional shape of the nut seat is non-circular.

2. The electronic expansion valve as described in claim 1, characterized in that, The nut seat is in the shape of an elongated cylinder, and the opening is an elongated oval hole.

3. The electronic expansion valve as described in claim 2, characterized in that, The nut seat includes a transmission nut, which includes a main body section and a guide section. The main body section is connected to the valve needle body. The diameter of the guide section is D1, and the diameter of the main body section is D2, where D1 < D2.

4. The electronic expansion valve as described in claim 3, characterized in that, The nut seat also includes a connecting limiting sleeve, through which the transmission nut is connected to the valve needle body.

5. The electronic expansion valve as described in claim 4, characterized in that, The connecting limiting sleeve includes a connecting section and a limiting section connected to each other. The transmission nut is connected to the valve needle body through the connecting section. The limiting section protrudes from the outer peripheral surface of the connecting section and protrudes from the outer peripheral surface of the transmission nut. The limiting section is used to abut against the edge of the opening. And / or, the transmission nut is a plastic part; And / or, the connecting limiting sleeve is a metal part.

6. The electronic expansion valve as described in claim 4, characterized in that, The first valve needle is provided with a first balance hole that communicates with the moving channel. The first balance hole axially penetrates the first valve needle, and the nut seat is provided with a clearance groove that avoids the first balance hole.

7. The electronic expansion valve as described in claim 4, characterized in that, An exhaust groove is provided at the connection position between the valve needle body and the nut seat, and the exhaust groove connects the inner cavity of the nut seat and the moving channel.

8. The electronic expansion valve as described in claim 1, characterized in that, The first valve needle includes an upper valve needle cylinder and a lower valve needle seat. The upper valve needle cylinder is provided with the opening, and the lower valve needle seat is provided with the first valve port. A supporting step is formed on its outer peripheral surface. The upper valve needle cylinder covers the lower valve needle seat and is supported by the supporting step.

9. The electronic expansion valve as described in claim 8, characterized in that, The upper valve syringe includes a barrel body and a stop section. The barrel body and the stop section are connected to form a limiting step. The limiting step is used to limit the movement of the valve seat structure of the electronic expansion valve. The stop section abuts against the supporting step.

10. The electronic expansion valve as described in claim 9, characterized in that, The outer diameter of the cylinder body is smaller than the outer diameter of the stop section, and the outer diameter of the stop section is equal to the outer diameter of the support step; And / or, the outer side of the cylinder body is provided with a first mounting groove for installing a first sealing ring, the first sealing ring is sealed against the channel wall of the valve seat structure, and a lubricating coating is also provided on the outer side of the first sealing ring.

11. The electronic expansion valve as described in claim 8, characterized in that, The lower valve needle seat is also provided with a side hole that penetrates its side wall, and the side hole communicates with the first valve port.

12. The electronic expansion valve as described in claim 8, characterized in that, The valve needle body is provided with a second mounting groove for installing a second sealing ring. The second sealing ring is sealed and abuts against the channel wall of the moving channel. A lubricating coating is also provided on the outside of the second sealing ring.

13. The electronic expansion valve as claimed in any one of claims 1 to 12, characterized in that, The electronic expansion valve also includes a valve seat structure, which has a movable cavity and a second valve port. The first valve needle is movably disposed between the movable cavity and the second valve port to open or close the second valve port. The first valve port is disposed on the end face of the first valve needle that blocks the second valve port and communicates with the second valve port.

14. The electronic expansion valve as described in claim 13, characterized in that, The valve seat structure includes a bearing seat, the bearing seat has a receiving cavity and an inner ring opening communicating with the receiving cavity, and the nut seat is adapted to pass through the inner ring opening of the bearing seat and is connected to the transmission rod in the receiving cavity.

15. The electronic expansion valve as described in claim 14, characterized in that, A spring is connected between the first valve needle and the bearing housing.

16. The electronic expansion valve as described in claim 14, characterized in that, The bearing housing is also provided with a second balance hole that communicates with the moving cavity, and the second balance hole extends axially through the bearing housing.

17. The electronic expansion valve as described in claim 15, characterized in that, The bearing housing is also provided with a side-opening vent that connects to the receiving cavity.

18. The electronic expansion valve as described in claim 13, characterized in that, An elastic seal is provided between the lower edge of the first valve needle and the second valve port.

19. A refrigeration device, characterized in that, Includes the electronic expansion valve as described in any one of claims 1 to 18.

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