Valve seat and electronic expansion valve

Abstract

The utility model relates to the technical field of fluid control, in particular to a valve seat and an electronic expansion valve. A first opening, a second opening and a first mounting opening are formed in the valve seat, the first mounting opening is inclined relative to the first opening and the second opening, and the included angle between the first mounting opening and the first opening is smaller than that between the first mounting opening and the second opening. A first protrusion protruding towards the first installation opening is arranged on the inner wall of the valve seat, a valve hole is formed between the first protrusion and the second opening, one end of the valve hole is communicated with the second opening, and a valve port is formed in the other end of the valve hole. A conical section is arranged on the inner wall of the valve seat and located at the end, connected with the valve hole, of the second opening, the inner diameter of the conical section is gradually reduced in the direction away from the second opening, and the valve hole is connected with the conical section. The butterfly valve has the advantages that the heights of the valve seat and the valve port can be reduced, the flow loss of a medium can be reduced, the flow is increased, and the overall height of the valve can be reduced.

Description

Technical Field

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

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and regulate and control the transport of media. They include electronic expansion valves, solenoid valves, and gate valves. Their components typically include a valve seat. A valve seat with an inclined mounting port has the mounting port and valve port tilted relative to the first and second ports. The valve seat has a protrusion, and a valve hole is located between the second port and the protrusion. The end of the valve hole closest to the first and mounting ports forms the valve port, which is located at the end of the protrusion closest to the mounting port. The valve port and mounting port are positioned opposite each other. The valve hole communicates with the first and second ports through the valve port. One end of the protrusion is located on the valve wall away from the mounting port, and the other end is located on the valve wall close to the mounting port. When the medium enters, it travels along the valve wall, passing the end of the protrusion away from the mounting port, and enters the valve port.

[0003] In existing technologies, the valve port is relatively high, and the end of the protrusion furthest from the installation port has a higher protrusion relative to the bottom wall of the valve, which leads to greater loss of medium flow and thus reduces the flow rate. Utility Model Content

[0004] In view of this, it is necessary to provide a valve seat and electronic expansion valve that can reduce the height of the valve port, reduce flow loss, increase flow rate, and save installation space.

[0005] This utility model provides a valve seat, which has a first port, a second port, and a first mounting port. The first port and the second port are located on opposite sides of the valve seat, and their central axes are collinear or parallel. The first mounting port is inclined relative to the first port and the second port, and the angle between the first mounting port and the first port is smaller than the angle between the first mounting port and the second port. The inner wall of the valve seat has a first protrusion protruding toward the first mounting port, and a valve hole is formed between the first protrusion and the second port. One end of the valve hole communicates with the second port, and the other end forms a valve opening. The valve hole communicates with the first port and the first mounting port through the valve opening. The inner wall of the valve seat has a tapered section located at the end where the second port connects to the valve hole and is connected to the inner wall of the valve hole. The inner diameter of the tapered section gradually decreases in the direction away from the second port.

[0006] This design not only reduces flow loss of the medium and increases flow rate, but also lowers the height of the valve seat, saving installation space.

[0007] In one embodiment, the taper θ of the tapered segment ranges from 10° to 30°.

[0008] This design reduces the flow loss of the medium, ensures the flow rate at the valve port, and guarantees the sealing effect of the first protrusion.

[0009] In one embodiment, the valve port has a diameter of d, the flow diameter of the first port is d1, and the flow diameter of the second port is d2, where d2 = d1 ≥ d.

[0010] In one embodiment, the valve port has a diameter of d, and the flow diameter of the first port is d1, where d = (0.6~1)d1.

[0011] This configuration not only ensures the flow rate at the valve port but also reduces the loss of the medium's flow.

[0012] In one embodiment, the height of the first protrusion protruding from the end near the first port relative to the inner wall of the valve seat is h, and the flow diameter of the first port is d1, where h ≤ 1 / 3d1.

[0013] This design reduces the height of the valve port and valve seat.

[0014] In one embodiment, along the height direction of the valve seat, the height of the end of the first protrusion near the second port relative to the bottom wall of the valve seat is h1, and the height of the highest point of the tapered segment away from the valve hole relative to the bottom wall of the valve seat is h2, where h1≤h2.

[0015] This configuration ensures the flow diameter of the medium at the second port.

[0016] This utility model also provides an electronic expansion valve, including a guide sleeve, a piston assembly and the valve seat described above. The guide sleeve is disposed in the first mounting port and connected to the valve seat. The piston assembly is slidably connected to the guide sleeve and can move relative to the valve port along the guide sleeve.

[0017] In one embodiment, the piston assembly includes a sealing cylinder with a receiving groove on one side of one end. A sealing gasket is provided in the receiving groove, and when the electronic expansion valve is closed, the sealing gasket abuts against the first protrusion.

[0018] In one embodiment, a sealing groove is formed on the end face of the sealing gasket away from the valve port, and a sealing ring is provided in the sealing groove. The sealing ring abuts against the groove wall of the receiving groove. Along the direction perpendicular to the axis of the first mounting port, the distance between the abutment point of the sealing ring and the receiving groove and the contact point between the sealing gasket and the first protrusion is D, where D≤1.5mm.

[0019] This design prevents the sealing gasket from tilting and affecting the sealing effect of the sealing ring.

[0020] In one embodiment, the side of the sealing cylinder extends toward the first protrusion to form a baffle, the baffle at least partially obscuring the opening of the receiving groove, and the baffle abutting against at least a portion of the outer side of the sealing gasket so that the sealing cylinder partially encloses the sealing gasket.

[0021] This design enhances the stability of the gasket during installation.

[0022] In one embodiment, the electronic expansion valve has a balance channel, one end of which is located near the valve port of the sealing cylinder and communicates with the valve port. A filter screen is provided at the end of the balance channel near the valve port. The filter screen protrudes relative to the piston assembly so that when the sealing gasket abuts against the first protrusion, the filter screen is at least partially located in the valve hole.

[0023] This design prevents the medium from entering the balance channel and affecting the normal operation of the piston assembly. When the electronic expansion valve is open, the medium will flush away the impurities accumulated on the protruding part of the filter screen, preventing the filter screen from becoming clogged.

[0024] This invention provides a tapered section at the end where the second port connects to the valve hole, so that the flow diameter of the medium gradually increases after flowing out of the valve hole. This not only reduces the height of the valve port and the flow resistance when the medium flows into the valve port, increasing the flow rate, but also reduces the height of the second port and the overall height of the valve. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the conventional technology, the drawings used in the description of the embodiments or the conventional technology 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 these drawings without creative effort.

[0026] Figure 1 A cross-sectional view of the valve seat provided by this utility model;

[0027] Figure 2 This is a cross-sectional view of an electronic expansion valve.

[0028] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0029] Figure 4 This is a schematic diagram of the installation of a connecting plate according to one embodiment;

[0030] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

[0031] Figure 6 A schematic diagram of the installation of the connecting plate provided for another embodiment;

[0032] Figure 7 for Figure 6 A magnified view of a section at point C;

[0033] Figure 8 This is a cross-sectional view of the terminal block;

[0034] Figure 9 A schematic diagram showing the fit between the guide sleeve and the sealing cylinder;

[0035] Figure 10 for Figure 9 A magnified view of a section at point D;

[0036] Figure 11 This is a schematic diagram of the positioning plate.

[0037] Figure 12 This is a schematic diagram of the installation of the positioning plate and positioning sleeve.

[0038] Reference numerals: 100, Electronic expansion valve; 10, Valve seat; 11, First port; 12, Second port; 13, First mounting port; 14, Valve hole; 141, Valve port; 15, Connecting pipe; 16, First protrusion; 161, First end; 162, Second end; 17, Conical section; 18, First step; 20, Guide sleeve; 21, First groove; 22, Second groove; 23, First cavity; 24, Limiting rod; 25, Second balance hole; 30, Coil assembly; 31, Housing cover; 311, Second step; 312, Opening; 313, Terminal block; 314, Wire pin; 315, Glue potting tank; 32, Motor; 321, Gear; 322, Lead wire; 33, Connecting plate; 40, Piston assembly Components; 41. Screw; 42. Bearing; 43. Sealing cylinder; 431. Positioning sleeve; 4311. Third mounting port; 4312. Mating part; 4313. Baffle; 4314. Groove; 432. Valve head; 4321. Third step; 4322. Sealing gasket; 4323. Sealing groove; 4324. Sealing ring; 4325. Receiving groove; 433. Nut seat; 4331. Mounting part; 4332. Through hole; 434. Positioning piece; 4341. Positioning part; 4342. Limiting hole; 4343. First balance hole; 4344. Second protrusion; 50. Balance channel; 51. Filter screen; 52. Mounting bracket; 521. Mounting groove; 53. Fourth step; 54. Inclined surface. Detailed Implementation

[0039] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0041] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0044] Please see Figure 1 and Figure 2This utility model provides a valve seat 10, which can be applied to various valves, such as a gate valve, a solenoid valve, or an electronic expansion valve 100.

[0045] The valve seat 10 has a first port 11, a second port 12 and a first mounting port 13 respectively. The valve seat 10 has a valve hole 14. The first port 11 and the second port 12 are used to connect the connecting pipe 15 respectively. The first mounting port 13 is used to install other parts. The first mounting port 13, the first port 11 and the second port 12 are respectively connected to the valve hole 14.

[0046] In one embodiment, the central axes of the first port 11 and the second port 12 are parallel and coaxial, that is, the first port 11 and the second port 12 are located on the same horizontal line, which can not only reduce flow losses during the medium flow process, but also reduce the overall height of the valve. In other embodiments, the first port 11 and the second port 12 may also be parallel but not coaxial.

[0047] The angle between the first mounting port 13 and the first port 11 is smaller than the angle between the first mounting port 13 and the second port 12.

[0048] The inner wall of the valve seat 10 protrudes towards the first mounting port 13 to form a first protrusion 16. A valve hole 14 is located between the first protrusion 16 and the second port 12. One end of the valve hole 14 communicates with the second port 12, and the other end forms a valve port 141. The valve port 141 is located at the end of the first protrusion 16 near the first mounting port 13. The valve hole 14 communicates with the first port 11 and the second port 12 through the valve port 141. The first protrusion 16 has a first end 161 and a second end 162. The first end 161 is near the first port 11, and the second end 162 is near the second port 12. The second end 162 rotates towards the first mounting port 13, such that the second end 162 is positioned relative to the first end 161 near the first mounting port 13. The valve port 141 faces the first mounting port 13, and the axis of the valve port 141 is parallel to the axis of the first mounting port 13. The inclined valve port 141 reduces its height, thereby reducing the flow resistance of the medium.

[0049] The valve seat 10 has a tapered section 17 on its inner wall. The tapered section 17 is located at the end of the second port 12 near the valve hole 14 and is connected to the inner wall of the valve hole 14. One end of the tapered section 17 is connected to the inner wall of the valve hole 14. The inner diameter of the tapered section 17 gradually increases in the direction away from the valve hole 14. The tapered section 17 can reduce the height of the valve port 141 and the valve seat 10, reduce the flow loss of the medium, and increase the flow rate of the medium. Specifically, after the tapered section 17 is set, the maximum height of the end of the tapered section 17 near the valve hole 14 is reduced, that is, the height of the valve hole 14 is reduced, and the height of the valve port 141 is also reduced, thereby reducing the height of the first end 161 of the first protrusion 16 on the valve seat 10, thus reducing the flow resistance. It is understandable that without the tapered section 17, the thickness of the first protrusion 16 at the second end 162 cannot be guaranteed in order to ensure the flow diameter of the second port 12. To ensure the thickness of the first protrusion 16 at the second end 162, the second port 12 and the valve port 141 need to be raised as a whole, and the height of the first protrusion 16 at the first end 161 will also increase accordingly, increasing the flow loss of the medium, reducing the flow rate of the valve port 141, and increasing the height of the valve seat 10, thereby increasing the overall height of the valve. It should be explained that the first protrusion 16 of this utility model is an irregular ring, and the height of the first end 161 protruding relative to the inner wall of the valve seat 10 is higher than the height of the second end 162 protruding relative to the inner wall of the valve seat 10.

[0050] The taper θ of the conical section 17 ranges from 10° to 30°, and can be any value between 10°, 15°, 18°, 20°, 25°, 30°, or 10° to 30°. Setting the taper of the conical section 17 within a suitable range can reduce the flow loss of the medium, ensure the flow rate of the valve port 141, and at the same time, ensure the thickness of the second end 162 of the first protrusion 16, thus ensuring the sealing effect of the first protrusion 16.

[0051] The inner walls of the first port 11 and the second port 12 are both provided with a first step 18. The first step 18 is used for the abutment of the connecting pipe 15. The inner diameter of the end of the tapered section 17 away from the valve hole 14 is equal to the inner diameter of the connecting pipe 15. That is, the end of the tapered section 17 away from the valve hole 14 is connected to the inner wall of the connecting pipe 15 to reduce the flow loss of the medium.

[0052] The diameter of valve port 141 is d, the flow diameter of the first port 11 is d1, and the flow diameter of the second port 12 is d2, where d2 = d1 ≥ d. Setting the diameter of valve port 141 smaller than that of the inlet and outlet reduces the resistance to the medium. Because the inside of valve seat 10 is uneven, the medium flowing through valve port 141 experiences greater resistance than at the inlet. Setting the diameter of valve port 141 smaller increases the flow rate of the medium. It should be noted that the flow diameter here refers to the inner diameter of the first port 11 and the second port 12 after connecting to the connecting pipe 15.

[0053] Preferably, d = (0.6~1)d1. This means that if the diameter of valve port 141 is too small, it will affect the flow rate of the medium and also increase the pressure loss of the medium. d can be any value between 0.6d1, 0.7d1, 0.8d1, 0.9d1, d1, or (0.6~1)d1.

[0054] The height of the protrusion 16 near the first port 11 is h, where h ≤ 1 / 3d1. This setting also reduces the height of the valve port 141 and the valve seat 10. If h is set too high, the height of the valve port 141 will be too high, increasing the flow resistance of the medium. Furthermore, to ensure the diameter of the valve port 141, the valve seat 10 needs to be raised. h can be any value of 1 / 3d1, 1 / 4d1, 1 / 5d1, or less than 1 / 3d1.

[0055] Along the height direction of the valve seat 10, the height of the end of the first protrusion 16 near the second port 12 relative to the bottom wall of the valve seat 10 is h1, and the height of the highest point of the end of the tapered section 17 away from the valve hole 14 relative to the bottom wall of the valve seat 10 is h2, where h1 ≤ h2. That is, the highest point of the tapered section 17 is higher than or equal to the highest point of the first protrusion 16. In this way, the medium flow diameter of the second port 12 can be guaranteed. It can be understood that if h1 > h2, in order to guarantee the flow diameter of the second port 12, the thickness of the first protrusion 16 at the second end 162 cannot be guaranteed. In order to guarantee the thickness of the first protrusion 16 at the second end 162, the second port 12 and the valve port 141 need to be raised as a whole, which increases the flow loss of the medium and reduces the flow rate of the valve port 141. It should be explained that "along the height direction of valve seat 10" refers to the height direction of valve seat 10 when it is placed horizontally. The height of valve seat 10 is perpendicular to the central axis of the first port 11 and the second port 12, and the height direction is away from the bottom wall of valve seat 10.

[0056] The width of the first protrusion 16 at the end near the first mounting port 13 gradually decreases along the direction near the first mounting port 13, which can enhance the sealing effect of the first protrusion 16 and form a guide surface to reduce fluid flow resistance.

[0057] Please see Figure 2 The present invention also provides an electronic expansion valve 100, including a guide sleeve 20, a coil assembly 30, a piston assembly 40 and the aforementioned valve seat 10. One end of the guide sleeve 20 extends into the valve seat 10 and is sealed to the valve seat 10. The piston assembly 40 is slidably connected to the guide sleeve 20. The piston assembly 40 can move along the guide sleeve 20 to adjust the distance between the piston assembly 40 and the valve port 141, thereby adjusting the opening degree of the valve port 141.

[0058] The coil assembly 30 includes a housing 31, a motor 32, and a connecting plate 33. The motor 32 and the connecting plate 33 are located inside the housing 31, and the motor 32 is mounted on the connecting plate 33. The housing 31 and the guide sleeve 20 are fixedly connected.

[0059] Please see Figure 4 and Figure 5 In one embodiment, the inner wall of the cover 31 has a second step 311, and the connecting plate 33 is press-fitted onto the second step 311, and then the connecting plate 33 is fixed to the cover 31 by laser welding; or, the inner wall of the guide sleeve 20 has a second step 311, and the connecting plate 33 is press-fitted onto the second step 311, and then the connecting plate 33 is fixedly connected to the guide sleeve 20 by laser welding. The cover 31 and the guide sleeve 20 are then fixedly connected by laser welding.

[0060] Please see Figure 6 and Figure 7 In another embodiment, the end face of the cover 31 facing the guide sleeve 20 is provided with a second step 311, and the connecting plate 33 is press-fitted onto the second step 311. The end faces of the cover 31 and the guide sleeve 20 are in contact, and the end faces of the connecting plate 33 and the guide sleeve 20 abut against each other. Laser welding is performed at the gap between the cover 31 and the guide sleeve 20, which can simultaneously weld and fix the connecting plate 33 and the guide sleeve 20. Alternatively, the end face of the guide sleeve 20 facing the cover 31 is provided with a second step 311, and the connecting plate 33 is press-fitted onto the second step 311. The end faces of the cover 31 and the guide sleeve 20 are in contact, and the end faces of the connecting plate 33 and the cover 31 abut against each other. Laser welding is performed at the gap between the cover 31 and the guide sleeve 20, which can simultaneously weld and fix the connecting plate 33 and the cover 31.

[0061] The output shaft of the motor 32 passes through the connecting plate 33 and is equipped with a gear 321.

[0062] The end of the cover 31 away from the guide sleeve 20 has an opening 312, and a terminal block 313 is provided in the opening 312. The motor 32 has a lead wire 322 (not shown in the figure). A connector pin 314 is passed through the terminal block 313. One end of the connector pin 314 extends into the terminal block 313 and is connected to the lead wire 322, and the other end extends out of the terminal block 313 for connecting to an external power source.

[0063] Please see Figure 8 The terminal block 313 has a potting groove 315 at the end facing the motor 32. The lead wire 322 and the terminal pin 314 are soldered together in the potting groove 315. The potting groove 315 is filled with insulating glue to prevent the terminal pins 314 from touching each other and causing a short circuit.

[0064] Preferably, the insulating adhesive is epoxy adhesive, which is inexpensive.

[0065] Please see Figure 2 and Figure 9 The piston assembly 40 includes a screw 41, a bearing 42, and a sealing cylinder 43. The gear 321 is fixedly connected to the inner ring of the bearing 42 facing the surface of the housing 31. The guide sleeve 20 has a first groove 21 and a second groove 22 at its two ends. The connecting plate 33 covers the opening of the first groove 21 to form a first cavity 23. There is a second mounting port (not shown in the figure) between the first groove 21 and the second groove 22. The bearing 42 is located in the second mounting port, and the outer ring of the bearing 42 is fixedly connected to the inner wall of the second mounting port. Gear 321 is located in the first cavity 23. The sealing cylinder 43 is slidably connected to the groove wall of the second groove 22. One end of the screw 41 extends into the inner ring of the bearing 42 and is connected to the bearing 42. The other end is threadedly connected to the sealing cylinder 43. When gear 321 rotates, it drives the inner ring of the bearing 42 to rotate, thereby driving the screw 41 to rotate. Since the sealing cylinder 43 is restricted by circumferential rotation, the circumferential rotation becomes axial rotation. The movement of the sealing cylinder 43 controls the flow rate of the valve port 141.

[0066] The sealing cylinder 43 includes a positioning sleeve 431, a valve head 432 or a nut seat 433. The positioning sleeve 431 is slidably connected to the groove wall of the second groove 22. The valve head 432 is located at one end of the positioning sleeve 431 near the valve port 141. The nut seat 433 is located inside the positioning sleeve 431. The screw 41 extends into the positioning sleeve 431 and is threadedly connected to the nut seat 433.

[0067] In one embodiment, the positioning sleeve 431 and the valve head 432 are threaded together for easy installation. In other embodiments, the positioning sleeve 431 and the valve head 432 can also be fixedly connected by snap-fit, welding, or other methods.

[0068] The nut seat 433 has a polygonal mounting portion 4331 at one end near the valve port 141. A third mounting opening 4311 is provided at one end of the positioning sleeve 4311. The third mounting opening 4311 is a polygonal shape adapted to the mounting portion 4331, and the mounting portion 4331 is installed within the third mounting opening 4311. This design prevents the nut seat 433 from rotating relative to the positioning sleeve 431. The positioning sleeve 431 provides circumferential restraint to the nut seat 433, and the snap-fit ​​connection facilitates installation. The polygon can be a triangle, quadrilateral, pentagon, hexagon, or other polygonal shapes.

[0069] The sealing cylinder 43 also includes a positioning plate 434, which is located on the end face of the positioning sleeve 431 away from the valve port 141. The screw 41 passes through the positioning plate 434, and the positioning plate 434 and the screw 41 are spaced apart to prevent the screw 41 from rotating and rubbing against the positioning plate 434.

[0070] The positioning plate 434 is made of polytetrafluoroethylene, which can reduce the overall weight of the electronic expansion valve 100 and has strong corrosion resistance.

[0071] Please see Figure 11 and Figure 12 The positioning piece 434 is provided with a positioning part 4341, and the end face of the positioning sleeve 431 is provided with a mating part 4312. The positioning part 4341 and the mating part 4312 are mated to prevent the positioning sleeve 431 from rotating. The positioning part 4341 may be a second protrusion 4344, and the mating part 4312 may be a groove 4314, with the second protrusion 4344 engaging in the groove 4314. Alternatively, the positioning part 4341 may be a groove 4314, and the mating part 4312 may be a second protrusion 4344.

[0072] The positioning piece 434 and the positioning sleeve 431 are fixed by riveting, which is a simple process.

[0073] Please continue reading Figure 9 The positioning plate 434 has a limiting hole 4342, and the guide sleeve 20 has a limiting rod 24, which passes through the limiting hole 4342. Since the guide sleeve 20 is fixed, the cooperation between the limiting rod 24 and the limiting hole 4342 can restrict the circumferential rotation of the sealing cylinder 43, thereby allowing the sealing cylinder 43 to move axially. Furthermore, since the limiting rod 24 passes through the limiting hole 4342, it can extend into the positioning sleeve 431, thus avoiding the need to reserve height for the limiting rod 24 and reducing the overall height of the electronic expansion valve 100.

[0074] The valve head 432 has a third step 4321 on the end face facing the positioning sleeve 431. The third step 4321 and the positioning sleeve 431 cooperate to form a receiving groove 4325. A sealing gasket 4322 is provided in the receiving groove 4325. When the valve port 141 is closed, the sealing gasket 4322 abuts against the first protrusion 16, thereby sealing the valve port 141.

[0075] The outer side of the positioning sleeve 431 extends toward the valve port 141 to form a baffle 4313. The baffle 4313 abuts against the outer side of at least part of the sealing gasket 4322, so that the baffle 4313 covers at least part of the sealing gasket 4322 and limits the sealing gasket 4322.

[0076] A sealing groove 4323 is provided on the end face of the sealing gasket 4322 away from the valve port 141. A sealing ring 4324 is provided in the sealing groove 4323. The sealing ring 4324 abuts against the positioning sleeve 431 to further enhance the sealing effect and prevent the medium from entering the valve port 14 through the gap of the receiving groove 4325.

[0077] Please see Figure 3Along the axis perpendicular to the first mounting opening 13, the distance between the contact point of the sealing ring 4324 and the receiving groove 4325 and the contact point of the sealing gasket 4322 and the first protrusion 16 is D, where D ≤ 1.5 mm. This arrangement prevents the sealing gasket 4322 from tilting and affecting the sealing effect of the sealing ring 4324. D can be any value of 0 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, or less than 1.5 mm. It should be explained that since the sealing ring 4324 is annular, the contact point between the sealing ring 4324 and the receiving groove 4325 is a circular arc, and the contact point between the sealing gasket 4322 and the first protrusion 16 is also a circular arc.

[0078] The electronic expansion valve 100 has a balance channel 50, which is used to balance the pressure at both ends of the piston assembly 40, so that when the valve is opened or closed, the sealing cylinder 43 will not be unable to move smoothly due to the pressure difference at both ends.

[0079] The positioning plate 434 has a first balance hole 4343, the guide sleeve 20 has a second balance hole 25, the nut seat 433 is hollow and has a through hole 4332, the through hole 4332 connects the nut seat 433 and the interior of the positioning sleeve 431, the hollow nut seat 433 connects to the valve port 141, and the interior of the nut seat 433, the through hole 4332, the interior of the positioning sleeve 431, the first balance hole 4343, the second groove 22, the second balance hole 25, and the first cavity 23 form a balance channel 50.

[0080] In one embodiment, the gap between the positioning piece 434 and the screw 41 is used as the first balancing hole 4343. In other embodiments, the first balancing hole 4343 may also be opened in the positioning piece 434.

[0081] A filter screen 51 is provided on the inner wall of the end of the balance channel 50 facing the valve port 141. The filter screen 51 is at least partially protruding relative to the valve head 432, so that when the electronic expansion valve 100 is closed, at least part of the filter screen 51 is placed inside the valve port 14. The filter screen 51 not only filters impurities entering the balance channel 50, preventing impurities from entering the balance channel 50 and affecting the normal operation of the piston assembly 40, but also, impurities will adhere to the protruding part of the filter screen 51. When the electronic expansion valve 100 is in the open state, the flow will flush away the accumulated impurities.

[0082] Please see Figure 10 The balance channel 50 is provided with a mounting bracket 52, and the filter screen 51 is installed through the mounting bracket 52. One end of the mounting bracket 52 is bent to form a mounting groove 521, and one end of the filter screen 51 is placed in the mounting groove 521. The mounting bracket 52 covers at least part of the filter screen 51.

[0083] The inner wall of the balance channel 50 has a fourth step 53 and an inclined surface 54. The fourth step 53 is positioned away from the valve port 141 relative to the inclined surface 54. One end of the mounting bracket 52 abuts against the fourth step 53, and the other end is narrowed. The outer side of the narrowed end abuts against the inclined surface 54, thereby axially limiting the filter screen 51 and preventing the filter screen 51 from entering the balance channel 50.

[0084] The mounting bracket 52 and the inclined surface 54 are interference-fitted to prevent impurities from entering the balance channel 50 from the gap between the mounting bracket 52 and the inner wall of the nut seat 433.

[0085] The fourth step 53 is located inside the nut seat 433, which allows for a larger contact area between the valve head 432 and the positioning sleeve 431, thereby strengthening the connection between the valve head 432 and the positioning sleeve 431. The inclined surface 54 is located inside the valve head 432, allowing the filter screen 51 to protrude fully.

[0086] During operation, motor 32 drives screw 41 to rotate. Screw 41 is threadedly connected to nut seat 433. Guide sleeve 20 circumferentially limits positioning piece 434 via limiting rod 24. Positioning piece 434 is riveted to positioning sleeve 431, thus circumferentially limiting positioning sleeve 431. Positioning sleeve 431 and nut seat 433 are engaged via polygonal snap-fit. Positioning sleeve 431 circumferentially limits nut seat 433. Therefore, nut seat 433 drives positioning sleeve 431 to move along guide sleeve 20 to adjust the distance between valve head 432 and valve port 141, thereby achieving flow control. This invention, by providing a tapered section 17 at the end connecting the second port 12 and valve hole 14, allows the flow diameter of the medium to gradually increase after flowing out of valve hole 14. This not only reduces the height of valve port 141, decreasing flow resistance and increasing flow rate, but also reduces the height of the second port 12, thus lowering the overall height of the valve.

[0087] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0088] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A valve seat, comprising a first port (11), a second port (12) and a first mounting port (13), the first port (11) and the second port (12) being located on opposite sides of the valve seat, the central axes of the first port (11) and the second port (12) being collinear or parallel, the first mounting port (13) being inclined relative to the first port (11) and the second port (12), the included angle between the first mounting port (13) and the first port (11) being smaller than the included angle between the first mounting port (13) and the second port (12), the inner wall of the valve seat being provided with a first protrusion (16) protruding towards the first mounting port (13), the first protrusion (16) and the second port (12) forming a valve hole (14), one end of the valve hole (14) being in communication with the second port (12), and the other end of the valve hole (14) being provided with a valve port (141), the valve hole (14) being in communication with the first port (11) and the first mounting port (13) through the valve port (141). characterized in that The inner wall of the valve seat has a tapered section (17), the tapered section (17) being located at the end of the valve hole (14) connected with the second port (12), and being connected with the inner wall of the valve hole (14), the inner diameter of the tapered section (17) gradually decreasing along the direction away from the second port (12).

2. The valve seat of claim 1, wherein The taper θ of the tapered section (17) ranges from 10° to 30°.

3. The valve seat of claim 1, wherein The diameter of the valve port (141) is d, the flow diameter of the first port (11) is d1, and the flow diameter of the second port (12) is d2, d2=d1≥d.

4. The valve seat of claim 1, wherein The diameter of the valve port (141) is d, and the flow diameter of the first port (11) is d1, d=(0.6-1)d1.

5. The valve seat of claim 1, wherein The height of the end of the first protrusion (16) close to the first port (11) protruding relative to the inner wall of the valve seat is h, the flow diameter of the first port (11) is d1, and h≤1 / 3d1.

6. The valve seat of claim 1, wherein Along the height direction of the valve seat, the height of the end of the first protrusion (16) close to the second port (12) relative to the bottom wall of the valve seat is h1, and the height of the highest point of the end of the tapered section (17) away from the valve hole (14) relative to the bottom wall of the valve seat is h2, h1≤h2.

7. An electronic expansion valve characterized by The valve seat is connected with a guide sleeve (20) and a piston assembly (40), the guide sleeve (20) being arranged in the first mounting port (13), the piston assembly (40) being in sliding connection with the guide sleeve (20) and being capable of moving relative to the valve port (141) along the guide sleeve (20).

8. The electronic expansion valve according to claim 7, characterized in that The piston assembly (40) comprises a blocking cylinder (43), the side surface of one end of the blocking cylinder (43) being provided with a receiving groove (4325), and the receiving groove (4325) is provided with a sealing gasket (4322), the sealing gasket (4322) being in abutment with the first protrusion (16) when the electronic expansion valve is closed.

9. The electronic expansion valve according to claim 8, characterized in that The sealing gasket (4322) is provided with a sealing groove (4323) away from the end face of the valve port (141), the sealing groove (4323) is provided with a sealing ring (4324), the sealing ring (4324) and the groove wall of the containing groove (4325) abut, along the direction perpendicular to the axis of the first mounting port (13), the abutting point of the sealing ring (4324) and the containing groove (4325) and the distance between the contact point of the sealing gasket (4322) and the first protrusion (16) are D, D≤1.5mm.

10. The electronic expansion valve according to claim 8, wherein The electronic expansion valve is provided with a balance channel (50), one end of the balance channel (50) is located at one end of the plugging cylinder (43) close to the valve port (141) and communicates with the valve port (141), a filter screen (51) is arranged at one end of the balance channel (50) close to the valve port (141), the filter screen (51) is arranged protruding relative to the piston assembly (40), so that when the sealing gasket (4322) abuts against the first protrusion (16), the filter screen (51) is at least partially located in the valve hole (14).

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