Valve element assembly and electronic expansion valve
By adding the diameter of the balance channel in the valve core assembly of the electronic expansion valve, the problem of excessive pressure in the traditional electronic expansion valve causing the valve needle to be pushed open under large diameters is solved, and faster pressure balance and higher sealing are achieved.
Patent Information
- Application Number
- CN202510122351.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-26
- Publication Date
- 2025-04-18
AI Technical Summary
In the case of large diameters, the balance channel of the traditional electronic expansion valve may cause too much pressure to push the valve needle open and partially leak.
A valve core assembly is designed, including a sleeve, valve seat, valve needle, screw rod, bearing, nut, stop rod, slip ring and slip ring bracket. By providing ventilation holes on the valve needle and grooves and notches in the mating passage and inner cavity of the valve seat, the diameter of the balance passage is increased, thereby quickly balancing the pressure.
It achieves faster pressure balance under large diameter conditions, reduces the possibility of the valve needle being pushed open, avoids partial leakage, and improves the sealing and efficiency of the valve.
Smart Images
Figure CN119844580A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of electronic expansion valves, and in particular to a valve core assembly and an electronic expansion valve. Background Art The electronic expansion valve can respond quickly to dynamic changes in air-conditioning refrigerant under driving conditions and can be used in a variety of control strategies to improve the efficiency and performance of the overall air-conditioning system.
[0002] Since the traditional electronic expansion valve needs to overcome the force generated by the inlet and outlet pressure difference to open the valve from a closed state, and when the diameter increases, the pressure difference force is too large, and the driving force generated by the motor cannot overcome it. Therefore, a special structure is needed to reduce the driving force required to open the valve. The specific movement process of the existing large-diameter electronic expansion valve solution is that the internal coil is energized to generate a magnetic field, the magnet rotates, and the magnet drives the connecting plate, the stop rod, and the slip ring to move together. The slip ring is installed on the spring guide rail, and the slip ring rotates on the spring guide rail. There are upper and lower limit parts on the spring guide rail to achieve upper and lower limit of the slip ring. At the same time, the rotation of the magnet drives the connection plate and the screw rod to rotate. The rotation of the screw rod is converted into the up and down movement of the screw rod through the threaded cooperation with the nut, thereby driving the valve needle to move up and down, and controlling the size of the flow area of the valve port. Furthermore, a plurality of side flow channel openings are opened on the peripheral side of the valve port, and a lower side interface is opened on the lower side of the valve port; However, in the above solution, when the fluid enters from the lower interface and exits from the side flow channel, due to the balance channel being not large enough, excessive pressure may cause the valve needle to be pushed open, resulting in partial leakage. Summary of the invention
[0003] The objectives of the present invention include, for example, providing a valve core assembly and an electronic expansion valve, which can balance the pressure more quickly and improve the situation where the instantaneous high pressure pushes the valve needle open during the bottom-inlet and side-outlet working conditions.
[0004] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a valve core assembly, comprising: Sleeve, valve seat, valve needle, valve port, screw rod, bearing, nut, stop rod, slip ring and slip ring bracket; The sleeve is tightly connected to the top of the valve seat, and the sleeve and the valve seat enclose a top inner cavity; along the axial direction of the valve seat, the valve seat has a matching channel and a matching inner cavity connected in sequence, the matching channel penetrates to the top of the valve seat to communicate with the top inner cavity, and the matching inner cavity penetrates to the bottom of the valve seat; The slip ring bracket is arranged on the top of the valve seat; the top of the slip ring bracket is provided with an upper end limit end point, the bottom of the slip ring bracket is provided with a lower end limit end point, and the slip ring is rotatably arranged on the slip ring bracket; the stop rod is fixedly connected to the top of the screw rod through a connecting plate; when the screw rod rotates, it can drive the stop rod to abut against the slip ring and make the slip ring rotate to the upper end limit end point or the lower end limit end point; the stop rod, the slip ring bracket and the slip ring are all located in the top inner cavity; a through notch is provided on the slip ring bracket; The screw rod is connected to the inner ring of the bearing component, and the outer ring of the bearing component is arranged in the matching channel; the valve needle is movably arranged in the matching inner cavity of the valve seat, and the nut component is arranged in the valve needle; the screw rod is threadedly connected with the nut component, so that when the screw rod rotates, the valve needle is driven to approach or move away from the valve port through the nut component; the bottom of the valve port has a lower side interface; At least one vent hole is provided on the valve needle, and the vent hole can communicate with the matching inner cavity and the lower interface; along the axial direction of the valve seat, a first groove is provided on the inner wall of the matching channel, and a second groove is provided on the inner wall of the matching inner cavity; Along the axial direction of the valve seat, the top inner cavity and the matching inner cavity are connected through the notch and the first groove of the slip ring bracket; the matching inner cavity can be connected with the lower side interface through the first groove, the second groove and the vent hole.
[0005] In an optional embodiment, along the circumferential direction of the valve needle, the plurality of vent holes are evenly distributed on the valve needle.
[0006] In an optional embodiment, the vent holes all extend along the axial centerline direction of the valve needle.
[0007] In an optional embodiment, a valve needle boss is provided on the valve needle; along the axial centerline direction of the valve seat, the valve needle boss can be movably embedded in the second groove.
[0008] In an optional embodiment, both the first groove and the second groove are arc-shaped grooves.
[0009] In an optional embodiment, the radii of the first groove and the second groove are both greater than the radius of the vent hole.
[0010] In an optional embodiment, it further comprises an annular valve needle sleeve, and the screw rod passes through the valve needle sleeve and is connected to the nut member; The nut member has a nut flange; the valve needle has a through countersunk hole, and the nut flange is supported on the step surface of the countersunk hole; the valve needle sleeve is arranged on the top of the nut flange so that the nut member is fixed in the countersunk hole; The outer wall of the nut member has a trimming portion, and a gap is maintained between the trimming portion and the inner wall of the counterbore and the inner wall of the valve needle sleeve, so that the inner cavity of the valve needle is connected with the matching inner cavity.
[0011] In an optional embodiment, the outer wall of the valve needle sleeve is interference fit with the inner wall of the counterbore of the valve needle.
[0012] In an optional embodiment, along the radial direction of the nut member, the trimming portions are symmetrically arranged on both sides of the nut member.
[0013] In a second aspect, the present invention provides an electronic expansion valve, comprising a valve core assembly as described in any one of the aforementioned embodiments.
[0014] The beneficial effects of the embodiments of the present invention include, for example: The valve core assembly of this solution includes a sleeve, a valve seat, a valve port, a screw, a bearing part, and a nut part. The sleeve and the valve seat are enclosed to form a top inner cavity, and the valve seat has a matching channel and a matching inner cavity connected in sequence; the screw is arranged in the matching channel; the valve needle is movably arranged in the matching inner cavity of the valve seat, and the nut part is arranged in the valve needle. Because at least one vent hole is arranged on the valve needle to connect the matching inner cavity and the lower side interface; a first groove is arranged on the inner wall of the matching channel, and a second groove is arranged on the inner wall of the matching inner cavity to connect the top inner cavity and the matching inner cavity. In this way, the diameter of the inner balancing channel of the matching channel and the matching inner cavity is increased, and the pressure is balanced more quickly, which plays a role in quickly balancing the pressure. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.
[0016] Figure 1 is a cross-sectional view of a valve core assembly according to an embodiment of the present invention; Figure 2 A schematic structural diagram of a valve needle of a valve core assembly according to an embodiment of the present invention; Figure 3 A schematic structural diagram of a valve seat of a valve core assembly according to an embodiment of the present invention; Figure 4 It is a cross-sectional schematic diagram of the valve core assembly from another perspective of the embodiment of the present invention.
[0017] Icons: 100-sleeve; 101-top inner cavity; 200-valve seat; 201-matching channel; 210-first groove; 202-matching inner cavity; 220-second groove; 300-valve needle; 310-vent; 320-valve needle boss; 330-valve needle sleeve; 340-counterbore; 341-step surface; 400-valve port; 410-side flow channel port; 420-lower side interface; 500-screw; 600-bearing member; 700-nut member; 710-nut flange; 720-trimming portion; 811-stop rod; 812-connecting plate; 820-slip ring; 830-slip ring bracket; 831-notch. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0021] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0022] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.
[0023] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.
[0024] Please refer to Figure 1, this embodiment provides a valve core assembly, including: The sleeve 100, the valve seat 200, the valve needle 300, the valve port 400, the screw rod 500, the bearing member 600, the nut member 700, the stop rod 811, the slip ring 820 and the slip ring bracket 830; The sleeve 100 is tightly connected to the top of the valve seat 200, and the sleeve 100 and the valve seat 200 enclose a top inner cavity 101; along the axial direction of the valve seat 200, the valve seat 200 has a matching channel 201 and a matching inner cavity 202 connected in sequence, the matching channel 201 penetrates to the top of the valve seat 200 to communicate with the top inner cavity 101, and the matching inner cavity 202 penetrates to the bottom of the valve seat 200; The slip ring bracket 830 is arranged on the top of the valve seat 200; the top of the slip ring bracket 830 is provided with an upper limit end point, the bottom of the slip ring bracket 830 is provided with a lower limit end point, and the slip ring 820 is rotatably arranged on the slip ring bracket 830; the stop rod 811 is fixedly connected to the top of the screw rod 500 through the connecting plate 812; when the screw rod 500 rotates, it can drive the stop rod 811 to abut against the slip ring 820, and make the slip ring 820 rotate to the upper limit end point or the lower limit end point; the stop rod 811, the slip ring bracket 830, and the slip ring 820 are all located in the top inner cavity 101; the slip ring bracket 830 is provided with a through notch 831; The screw rod 500 is connected to the inner ring of the bearing member 600, and the outer ring of the bearing member 600 is arranged in the matching channel 201; the valve needle 300 is movably arranged in the matching inner cavity 202 of the valve seat 200, and the nut member 700 is arranged in the valve needle 300; the screw rod 500 and the nut member 700 are threadedly connected, so that when the screw rod 500 rotates, the nut member 700 drives the valve needle 300 to approach or move away from the valve port 400; the bottom of the valve port 400 has a lower side interface 420; The valve needle 300 is provided with at least one vent hole 310, which can communicate with the matching inner cavity 202 and the lower interface 420; along the axial direction of the valve seat 200, a first groove 210 is provided on the inner wall of the matching channel 201, and a second groove 220 is provided on the inner wall of the matching inner cavity 202; Along the axial direction of the valve seat 200 , the top inner cavity 101 is connected to the matching inner cavity 202 through the notch 831 of the slip ring bracket 830 and the first groove 210 ; the matching inner cavity 202 can be connected to the lower side interface 420 through the first groove 210 , the second groove 220 , and the vent hole 310 .
[0025] The valve needle 300 of the valve core assembly of this solution is provided with at least one vent hole 310 to connect the matching inner cavity 202 and the lower interface 420; the inner wall of the matching channel 201 is provided with a first groove 210, and the inner wall of the matching inner cavity 202 is provided with a second groove 220 to connect the top inner cavity 101 and the matching inner cavity 202. In this way, the inner balance channel diameters of the matching channel 201 and the matching inner cavity 202 are increased, and the pressure is balanced more quickly, which plays a role in quickly balancing the pressure.
[0026] Please continue reading Figure 1 , Figure 2 , Figure 3 and Figure 4 , to understand more structural details of the valve core assembly. As can be seen from the figure, the bearing member 600 of this embodiment includes two bearings arranged in parallel with each other in the matching channel 201. The arrangement of the two bearings can further ensure the stability of the screw rod 500 during rotation. Optionally, the valve port 400 includes an upper valve port 400 and a lower valve port 400 assembled in a split manner. Four side flow channel ports 410 are arranged in the circumferential direction of the valve port 400, and a lower side interface 420 is arranged at the bottom of the valve port 400. The side flow channel ports 410 and the lower side interface 420 are both used for the entry and exit of fluids.
[0027] It can be seen from the figure that in an optional embodiment, along the circumferential direction of the valve needle 300, a plurality of vent holes 310 are evenly distributed on the valve needle 300. The figure shows that four evenly distributed vent holes 310 are arranged on the top of the valve needle 300.
[0028] In an optional embodiment, the vent holes 310 all extend along the axis of the valve needle 300. This ensures that the fluid can flow into the vent holes 310 in the shortest path, thereby increasing the speed of balancing the pressure.
[0029] In an optional embodiment, the inner diameter of the matching inner cavity 202 is larger than the inner diameter of the matching channel 201. Under the requirements of both the rotation of the screw rod 500 and the lifting and lowering of the valve needle 300, such a setting method can not only simplify the processing and manufacturing, but also improve the airtightness of the valve core. It is not difficult to understand that in other embodiments of the present invention, the inner diameter of the matching inner cavity 202 can also be less than or equal to the inner diameter of the matching channel 201. This is just an example and is not limited.
[0030] like Figure 2 and Figure 3 In an optional embodiment, a valve needle boss 320 is provided on the valve needle 300; along the axis direction of the valve seat 200, the valve needle boss 320 can be movably embedded in the second groove 220. That is, the valve needle boss 320 is restricted from circumferential movement along the valve seat 200, so that the second groove 220 and the valve needle boss 320 cooperate to form an anti-rotation structure.
[0031] from Figure 3 It can also be seen that in an optional embodiment, along the radial direction of the valve seat 200, the first groove 210 and the second groove 220 are arranged in a facing relationship. This is conducive to the first groove 210 and the second groove 220 being able to balance the pressure more quickly. It is not difficult to understand that in other embodiments of the present invention, the first groove 210 and the second groove 220 can also be arranged in a staggered manner. This is only an example and is not limited.
[0032] In an optional embodiment, the first groove 210 and the second groove 220 are both arc grooves. It is easy to understand that in other embodiments, the first groove 210 and the second groove 220 can also be rectangular grooves, prismatic grooves, etc. This is just an example and is not limited.
[0033] In an optional embodiment, the radius of the first groove 210 and the second groove 220 are the same. This ensures the smoothness of the fluid passing through the first groove 210 and the second groove 220. It is not difficult to understand that in other embodiments of the present invention, the radius of the first groove 210 and the second groove 220 may also be different. This is just an example and is not limited.
[0034] In an optional embodiment, the radius of the first groove 210 and the second groove 220 are both greater than the radius of the vent hole 310. This can increase the speed of balancing the pressure on the inner wall of the mating channel 201 and the mating inner cavity 202.
[0035] from Figure 4 It can also be seen that in an optional embodiment, an annular valve needle sleeve 330 is further included, the screw rod 500 passes through the valve needle sleeve 330 and is connected to the nut member 700; the nut member 700 has a nut flange 710; the valve needle 300 has a through countersunk hole 340, and the nut flange 710 is abutted against the step surface 341 of the countersunk hole 340; the valve needle sleeve 330 is arranged on the top of the nut flange 710, so that the nut member 700 is fixed in the countersunk hole 340; the outer wall of the nut member 700 has a trimming portion 720, and the trimming portion 720 maintains a gap with the inner wall of the countersunk hole 340 and the inner wall of the valve needle sleeve 330, so that the inner cavity of the valve needle 300 is connected with the matching inner cavity 202. The countersunk hole 340 passes from the top of the valve needle 300 to the bottom of the valve needle 300, so that the matching inner cavity 202 and the lower side interface 420 are connected.
[0036] The trimmed portion 720 of the nut member 700 can complement the ventilation effect between the inner cavity 202 and the lower interface 420 , thereby ensuring the ability of the valve core assembly to quickly balance pressure.
[0037] In an optional embodiment, the outer wall of the valve needle sleeve 330 is interference-fitted with the inner wall of the counterbore 340 of the valve needle 300 , so as to ensure that the nut member 700 can be stably disposed in the valve needle 300 .
[0038] In an optional embodiment, along the radial direction of the nut member 700, the trimming portions 720 are symmetrically arranged on both sides of the nut member 700. The symmetrically arranged trimming portions 720 can ensure the ventilation effect in the counterbore 340.
[0039] In a second aspect, the present invention provides an electronic expansion valve, the electronic expansion valve comprising the valve core assembly of any one of the aforementioned embodiments.
[0040] In summary, the embodiments of the present invention provide a valve core assembly and an electronic expansion valve, which have at least the following advantages: The valve needle 300 is provided with a plurality of vent holes 310 and the first groove 210 and the second groove 220 of the valve seat 200, and the notch 831 of the slip ring bracket 830 connect the matching inner cavity 202 and the lower side interface 420, playing a role in quickly balancing the pressure.
[0041] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims
1. A valve core assembly, characterized in that: include: A sleeve (100), a valve seat (200), a valve needle (300), a valve port (400), a screw rod (500), a bearing member (600), a nut member (700), a stop rod (811), a slip ring (820), and a slip ring bracket (830); The sleeve (100) is tightly connected to the top of the valve seat (200), and the sleeve (100) and the valve seat (200) enclose a top inner cavity (101); along the axial direction of the valve seat (200), the valve seat (200) has a matching channel (201) and a matching inner cavity (202) connected in sequence, the matching channel (201) passes through the top of the valve seat (200) to communicate with the top inner cavity (101), and the matching inner cavity (202) passes through the bottom of the valve seat (200); The slip ring bracket (830) is arranged on the top of the valve seat (200); an upper end limit end point is arranged on the top of the slip ring bracket (830), and a lower end limit end point is arranged on the bottom of the slip ring bracket (830); the slip ring (820) is rotatably arranged on the slip ring bracket (830); the stop rod (811) is fixedly connected to the top of the screw rod (500) through a connecting plate (812); when the screw rod (500) rotates, it can drive the stop rod (811) to abut against the slip ring (820) and make the slip ring (820) rotate to the upper end limit end point or the lower end limit end point; the stop rod (811), the slip ring bracket (830), and the slip ring (820) are all located in the top inner cavity (101); a through notch (831) is arranged on the slip ring bracket (830); The screw rod (500) is connected to the inner ring of the bearing member (600), and the outer ring of the bearing member (600) is arranged in the matching channel (201); the valve needle (300) is movably arranged in the matching inner cavity (202) of the valve seat (200), and the nut member (700) is arranged in the valve needle (300); the screw rod (500) and the nut member (700) are threadedly connected, so that when the screw rod (500) rotates, the nut member (700) drives the valve needle (300) to approach or move away from the valve port (400); the bottom of the valve port (400) has a lower side interface (420); At least one vent hole (310) is provided on the valve needle (300), and the vent hole (310) can communicate with the matching inner cavity (202) and the lower interface (420); along the axial direction of the valve seat (200), a first groove (210) is provided on the inner wall of the matching channel (201), and a second groove (220) is provided on the inner wall of the matching inner cavity (202); Along the axial direction of the valve seat (200), the top inner cavity (101) is connected to the matching inner cavity (202) through the notch (831) of the slip ring bracket (830) and the first groove (210); the matching inner cavity (202) can be connected to the lower side interface (420) through the first groove (210), the second groove (220) and the vent hole (310).
2. The valve core assembly according to claim 1, characterized in that: Along the circumferential direction of the valve needle (300), the plurality of vent holes (310) are evenly distributed on the valve needle (300) in the circumferential direction.
3. The valve core assembly according to claim 1, characterized in that: The vent holes (310) all extend along the axial centerline direction of the valve needle (300).
4. The valve core assembly according to claim 1, characterized in that: A valve needle boss (320) is provided on the valve needle (300); along the axial centerline direction of the valve seat (200), the valve needle boss (320) can be movably embedded in the second groove (220).
5. The valve core assembly according to claim 1, characterized in that: The first groove (210) and the second groove (220) are both arc-shaped grooves.
6. The valve core assembly according to claim 5, characterized in that: The radii of the first groove (210) and the second groove (220) are both greater than the radius of the vent hole (310).
7. The valve core assembly according to claim 1, characterized in that: It also includes an annular valve needle sleeve (330), and the screw rod (500) passes through the valve needle sleeve (330) and is connected to the nut member (700); The nut member (700) has a nut flange (710); the valve needle (300) has a through countersunk hole (340), and the nut flange (710) is supported on a step surface (341) of the countersunk hole (340); the valve needle sleeve (330) is arranged on the top of the nut flange (710) so that the nut member (700) is fixed in the countersunk hole (340); The outer wall of the nut member (700) has a trimming portion (720), and a gap is maintained between the trimming portion (720) and the inner wall of the counterbore (340) and the inner wall of the valve needle sleeve (330), so that the inner cavity of the valve needle (300) is connected to the matching inner cavity (202).
8. The valve core assembly according to claim 7, characterized in that: The outer wall of the valve needle sleeve (330) is interference-fitted with the inner wall of the counterbore (340) of the valve needle (300).
9. The valve core assembly according to claim 7, characterized in that: Along the radial direction of the nut member (700), the trimming portions (720) are symmetrically arranged on two sides of the nut member (700).
10. An electronic expansion valve, characterized in that: The electronic expansion valve comprises a valve core assembly according to any one of claims 1-9.