An electrically operated valve

Abstract

The electric valve comprises a shell (26) and an end cover (16), the shell (26) is internally provided with a first cavity (1) and a valve port (265), the electric valve further comprises a rotor assembly (10), a rod assembly (14) and a valve core assembly (33), the rotor assembly (10) is connected with one end of the rod assembly (14), the other end of the rod assembly (14) is connected with the valve core assembly (33). The electric valve further comprises a sealing component (19), the sealing component (19) is away from the valve port (265) relative to the valve core assembly (33). The sealing component (19) comprises a first cylindrical part (192), a diaphragm part (191) and an annular sealing part (195), by arranging the sealing component (19), the first cylindrical part (192) is connected with the rod assembly (14) and the connection is sealed, and the outer circumferential side of the diaphragm part (191) of the sealing component (19) is connected with the shell (26) and / or the end cover (16) and the connection is sealed, the annular sealing part (195) is clamped between the end cover (16) and the shell (26), the annular sealing part (195) is in a compressed state, fluid can be prevented from contacting the rotor assembly (10), and the rotor assembly (10) can be prevented from being corroded by fluid.

Description

Technical Field

[0001] This invention relates to the field of flow regulation technology, and more particularly to an electric valve. Background Technology

[0002] Electric valves can be widely used in fluid media pipeline systems to regulate the flow rate of the medium. Taking the application of electric valves in the automotive field as an example, electric valves can be used in air conditioning systems, engine cooling systems, battery cooling systems, or fuel supply systems.

[0003] Electric valves include a valve core component that can move relative to the housing. The valve core component is driven by the actuating unit. In some applications of electric valves, fluid may erode the actuating unit, and it is necessary to prevent fluid leakage from the valve cavity into the actuating unit. Summary of the Invention

[0004] This solution discloses an electric valve, including a housing and an end cap. The housing has a first cavity and a valve port. The electric valve also includes a rotor assembly, a rod assembly, and a valve core assembly. One end of the rotor assembly is connected to the rod assembly, and the other end of the rod assembly is connected to the valve core assembly. The electric valve also includes a sealing component, which is located away from the valve port relative to the valve core assembly.

[0005] The sealing component includes a first cylindrical portion and a diaphragm portion. The first cylindrical portion has a second through hole through which another part of the rod assembly passes. The first cylindrical portion is connected to the rod assembly and the connection is sealed. The outer peripheral side of the diaphragm portion is sealed to the housing and / or end cap.

[0006] By incorporating sealing components, the first cylindrical portion is connected to the rod assembly with a sealed connection, and the outer periphery of the diaphragm portion is sealed to the housing and / or end cap. This effectively prevents fluid from contacting the rotor assembly and thus prevents fluid corrosion of the rotor assembly. Furthermore, the diaphragm portion does not affect the vertical movement of the rod assembly.

[0007] In one specific embodiment, the sealing component further includes an annular sealing portion, and the diaphragm portion is located between the annular sealing portion and the first cylindrical portion; the annular sealing portion is clamped between the end cap and the housing, and the annular sealing portion is in a compressed state, which can better achieve the sealing between the sealing component and the cap and the housing. Attached Figure Description

[0008] Figure 1 A front view schematic diagram of one embodiment of the present invention is shown;

[0009] Figure 2 It shows Figure 1 A partial cross-sectional view of the electric valve shown along line EE.

[0010] Figure 3 It shows Figure 2A partially enlarged schematic diagram of the electric valve shown.

[0011] Figure 4 It shows Figure 2 A cross-sectional schematic diagram of the sealing component shown;

[0012] Figure 5 It shows Figure 2 An exploded schematic diagram of a portion of the electric valve shown.

[0013] Figure 6 It shows Figure 2 A partially enlarged schematic diagram of the electric valve shown. Detailed Implementation

[0014] The embodiments are described in detail below with reference to the accompanying drawings.

[0015] like Figure 2 As shown, the electric valve includes a housing 26 and an end cap 16. The housing 26 has a first chamber 1 and a valve port 265. The electric valve also includes a rod assembly 14 and a valve core assembly 33. One end of the rod assembly 14 is connected to the valve core assembly 33, and the other end of the rod assembly 14 is connected to the rotor assembly 10. The rod assembly 14 and the valve core assembly 33 can move up and down in the extending direction of the rod assembly 14, thereby opening or closing the valve port 265. The housing 26 includes a first channel 261 and a second channel 262. The first channel 261 communicates with the first chamber 1, and the valve port 265 can communicate with the second channel 262 and the first chamber 1.

[0016] like Figure 2 As shown, the electric valve also includes a coil assembly 31 and a sleeve 3. The sleeve 3 is fixed to the end cap 16 and the connection is sealed. A second cavity 36 is formed inside the sleeve 3, and at least a portion of the rotor assembly 10 is disposed in the second cavity 36. The coil assembly 31 is sleeved on the sleeve 3. The end cap 16 includes a first through hole 163 penetrating the end cap 16. A portion of the rod assembly 14 passes through the first through hole 163 of the end cap 16 and is drively connected to the rotor assembly 10. The rod assembly 14 is slidably engaged with the inner wall corresponding to the first through hole 163. The rotor assembly 10 also includes a lead screw 8 and a permanent magnet 4. A nut component 12 is sleeved around the lead screw 8. The nut component 12 and the lead screw 8 are threaded together. The nut component 12 is fixed to the end cap 16. The lead screw 8 can move upward or downward relative to the nut component 12, and the lead screw 8 can drive the rod assembly 14 to move. An elastic element 11 is disposed between the rod assembly 14 and the lead screw 8.

[0017] The first channel 261 and the second channel 262 of the electric valve can be connected to the piping of a fuel cell system with high pressure. To prevent high-pressure fluid in the first chamber 1 from entering the rotor assembly 10 or to reduce the risk of external leakage, such as... Figures 2 to 4As shown, the electric valve also includes a sealing component 19, which is located away from the valve port 265 relative to the valve core assembly 33. The sealing component 19 includes a first cylindrical portion 192 and an annular diaphragm portion 191. The first cylindrical portion 192 is located on the inner circumferential side of the diaphragm portion 191. The first cylindrical portion 192 includes a second through hole 193. Another portion of the rod assembly 14 passes through the second through hole 193 of the sealing component 19 and connects to the valve core assembly 33. The outer circumferential side of the diaphragm portion 191 connects to the housing 26 and the end cap 16, and the connection is sealed. The sealing component 19 can be made of rubber or metal and is elastic. Figure 4 As shown, the diaphragm portion 191 includes a first flattening portion 196 connected to the annular sealing portion 195, a second flattening portion 197 connected to the first cylindrical portion 192, and a corrugated portion 198 located between the first flattening portion 196 and the second flattening portion 197. The corrugated portion 198 can expand and contract under external force to accommodate the up-and-down movement of the rod assembly 14. Figures 2 to 4 As shown, the portion of the sealing member 19 that contacts the rod assembly 14 remains stationary relative to the rod assembly 14, and the portion of the sealing member 19 that contacts the housing 26 remains stationary relative to the housing 26. Compared to using a dynamic seal, using a static seal can reduce the risk of leakage. In other embodiments, the outer periphery of the diaphragm portion 191 may only be connected to the housing 26 or the end cap 16, and the connection is sealed.

[0018] like Figure 3 and Figure 4 As shown, the electric valve also includes an annular sleeve 20, which surrounds the outer periphery of the first cylindrical portion 192 and the second through hole 193. The first cylindrical portion 192 includes an outer wall portion and an inner wall portion located inside the second through hole 193. The inner wall portion and the outer wall portion are located on the inner and outer sides of the first cylindrical portion 192. The annular sleeve 20 is interference-fitted with the outer wall portion of the first cylindrical portion 192. The annular sleeve 20 can apply pressure to the first cylindrical portion 192 towards the rod assembly 14, so that the first cylindrical portion 192 and the outer periphery of the rod assembly 14 fit more tightly, which can reduce leakage at the second through hole 193. This can prevent the high-pressure fluid in the first cavity 1 from entering the rotor assembly 10, thereby preventing the fluid from corroding the rotor assembly 10 and preventing the fluid from freezing at low temperature after entering the second cavity 36, which would cause the rotor assembly 10 to not rotate.

[0019] like Figures 2 to 3As shown, the electric valve also includes a first limiting component 21, located at the end of the annular sleeve 20 away from the first through hole 163. At least a portion of the outer diameter of the first limiting component 21 is larger than the inner diameter of the annular sleeve 20. The first limiting component 21 abuts against the annular sleeve 20 and is fixed to the rod assembly 14, thereby axially limiting the end of the annular sleeve 20 abutting against the first limiting component 21. In this embodiment, the first limiting component 21 is a retaining ring. The rod assembly 14 has a groove 142 recessed into the outer peripheral surface of the rod assembly 14. The groove 142 corresponds to the first limiting component 21. A portion of the first limiting component 21 extends into the groove 142, thereby limiting the first limiting component 21 in the axial direction. The other portion of the first limiting component 21 extends radially outward along the rod assembly 14 and abuts against one end of the sleeve 20. The retaining ring can be an E-shaped retaining ring, and its inner diameter can vary, allowing it to pass through the thicker portion of the rod assembly 14 to reach the groove 142 during installation. In other embodiments, the first limiting member 21 may also be a nut, which can be fixed to the rod assembly 14 by internal threads. However, the structure of the retaining ring is simpler and less expensive than that of the nut. In other embodiments, the first limiting member 21 may also be part of the rod assembly 14.

[0020] like Figure 3 As shown, the electric valve also includes a second limiting member 18, located at one end of the sealing member 19 near the first through hole 163. At least a portion of the outer diameter of the second limiting member 18 is larger than the diameter of the second through hole 193, and the sealing member 19 abuts against the second limiting member 18. The second limiting member 18 is fixedly connected to the rod assembly 14 or is an integral structure therein. This allows one end of the first cylindrical portion 192 to be axially limited. The second limiting member 18 can be axially limited by the fifth step portion 141 of the rod assembly 14. In other embodiments, the second limiting member 18 can be part of the rod assembly 14.

[0021] like Figure 3 and Figure 4As shown, the annular sleeve 20 includes an outer extension 201 extending radially outward along the rod assembly 14 and a second cylindrical portion 202 extending axially along the rod assembly 14. The second cylindrical portion 202 is sleeved on the first cylindrical portion 192. The outer diameter of the second limiting portion 18 is larger than the outer diameter of the second cylindrical portion 202. The second flat portion 197 of the diaphragm portion 191 is clamped between the second limiting portion 18 and the outer extension 201. The outer extension 201 extending radially outward along the rod assembly 14 and the second limiting portion 18 can increase the area of ​​the clamped portion of the sealing member 19, further reducing the deformation of the first cylindrical portion 192 caused by pulling, and also increasing the area of ​​the sealing surface, which can reduce leakage at the second through hole 193. The annular sleeve 20 also has a flared opening or chamfer 203 located at the connection between the outer extension 201 and the second cylindrical portion 202, and the flared opening or chamfer 203 gradually widens towards the second limiting portion 18. Before the annular sleeve 20 is provided on the outer periphery of the first cylindrical portion 192, the outer diameter of the first cylindrical portion 192 can be slightly larger than the inner diameter of the annular sleeve 20. This flaring or chamfer can guide the first cylindrical portion 192 when it is fitted into the inner side of the annular sleeve 20, making it easier for the first cylindrical portion 192 to fit into the inner side of the annular sleeve 20. This chamfer can be arc-shaped. The annular sleeve 20 can be manufactured by stamping, which is relatively inexpensive.

[0022] like Figure 3 and Figure 4 As shown, the sealing component 19 also includes an annular protrusion 194 that protrudes from the inner side of the first cylindrical portion 192 toward the rod assembly 14 and surrounds the rod assembly 14. The rod assembly 14 has an annular groove 144 recessed into the outer peripheral surface of the rod assembly 14 and surrounding the rod assembly 14. The annular groove 144 corresponds to the annular protrusion 194. At least a portion of the annular protrusion 194 extends into the annular groove 144 and abuts against the annular groove 144. This not only limits the first cylindrical portion 192 in the axial direction but also improves the sealing performance. When not under pressure, the height of the annular protrusion 194 protruding from the inner side of the first cylindrical portion 192 is greater than the depth of the annular groove 144. When the first cylindrical portion 192 is fitted onto the outer periphery of the rod assembly 14, the annular protrusion 194 can be in a compressed state, which can relatively reduce leakage at the second through hole 193. In other embodiments, the rod assembly 14 may also have an annular protrusion that protrudes from the outer peripheral surface of the rod assembly 14 and surrounds the rod assembly 14, and the sealing member 19 has an annular groove that is recessed into the inner side of the first cylindrical portion 192 and surrounds the rod assembly 14, with at least a portion of the annular protrusion extending into the annular groove and the annular protrusion abutting against the annular groove.

[0023] like Figure 4 and Figure 6As shown, the sealing component 19 also includes an annular sealing portion 195 located at the outer peripheral edge of the diaphragm portion 191. The annular sealing portion 195 surrounds the first through hole 163 of the end cover 16. The thickness of the annular sealing portion 195 is greater than the thickness at the connection between the diaphragm portion 191 and the annular sealing portion 195. The end cover 16 includes a first stepped portion 165, and the housing 26 includes a second stepped portion 263. Both the first stepped portion 165 and the second stepped portion 263 surround the first through hole 163. The first stepped portion 165 and the second stepped portion 263 are disposed opposite to each other and form a receiving cavity between them. The annular sealing portion 195 is located between the first stepped portion 165 and the second stepped portion 263 and is in a compressed state, which can reduce fluid leakage from the first cavity 1 through the outer peripheral edge of the sealing component 19 into the rotor assembly 10. The annular sealing portion 195 can also reduce fluid leakage from the first cavity 1 through the space between the end cover 16 and the housing 26 to the outside and / or the stator assembly 31. The first leveling part 196 is clamped between the first step part 165 and the second step part 263. The first leveling part 196 can be in a compressed state, which can further reduce leakage.

[0024] It is understood that sealing the outer periphery of the diaphragm portion 191 of the sealing component 19 with at least one of the housing 26 and the end cap 16 can reduce fluid leakage from the first cavity 1 through the end cap 16 and the housing 26 to the outside and / or the stator assembly 31. The diaphragm portion 191 is also expandable and retractable, without affecting the vertical movement of the rod assembly 14 connected to the sealing component 19. In this embodiment, the outer periphery of the diaphragm portion 191 is also provided with an annular sealing portion 195 to press between the end cap 16 and the housing 26, indirectly achieving a seal between the diaphragm portion 191 and the end cap 16 and the housing 26. It should be understood that the outer periphery of the diaphragm portion 191 can also be directly connected and sealed with the end cap 16 and the housing 26.

[0025] like Figure 6 As shown, the end cap 16 includes a third stepped portion 164, which corresponds to a fourth stepped portion 264 of the housing 26. The third stepped portion 164 and the fourth stepped portion 264 are disposed opposite each other and form a receiving cavity between them. The electric valve also includes an annular seal 17, which is disposed between the third stepped portion 164 and the fourth stepped portion 264 and is in a compressed state. The third stepped portion 164 is located away from the first cavity 1 relative to the first stepped portion 165. The annular seal 17 can reduce external leakage of the first cavity 1 and forms a double seal with the annular seal portion 195. The end cap 16 can be welded to the housing 26 and the connection is sealed. Welding can further reduce external leakage of the first cavity 1.

Claims

1. An electric valve, comprising a housing (26) and an end cap (16), the housing (26) having a first cavity (1) and a valve port (265), the electric valve further comprising a rotor assembly (10), a rod assembly (14) and a valve core assembly (33), the rotor assembly (10) being connected to one end of the rod assembly (14), and the other end of the rod assembly (14) being connected to the valve core assembly (33); characterized in that, The end cap (16) has a first through hole (163), a portion of the rod assembly (14) passes through the first through hole (163) and slides in cooperation with the inner wall corresponding to the first through hole (163). The electric valve also includes a sealing component (19), which is located away from the valve port (265) relative to the valve core assembly (33). The sealing component (19) includes a first cylindrical portion (192) and a diaphragm portion (191). The first cylindrical portion (192) has a second through hole (193). Another portion of the rod assembly (14) passes through the second through hole (193). The first cylindrical portion (192) is connected to the rod assembly (14) and the connection is sealed. The outer peripheral side of the diaphragm portion (191) is sealed to the housing (26) and / or the end cap (16). The electric valve further includes a second limiting component (18), through which the rod assembly (14) passes. The second limiting component (18) is located at one end of the sealing component (19) near the first through hole (163). At least a portion of the outer diameter of the second limiting component (18) is larger than the diameter of the second through hole (193). The second limiting component (18) is fixed to or is part of the rod assembly (14). The sealing component (19) abuts against the second limiting component (18). The electric valve also includes an annular sleeve (20), at least a portion of which is sleeved on the first cylindrical portion (192), and the annular sleeve (20) is interference-fitted with the outer wall of the first cylindrical portion (192). The annular sleeve (20) includes an extension (201) extending radially along the rod assembly (14) and a second cylindrical portion (202) extending axially along the rod assembly (14). The outer diameter of the second limiting member (18) is larger than the outer diameter of the second cylindrical portion (202). The second flattening portion (197) of the diaphragm portion (191) is sandwiched between the second limiting member (18) and the extension (201).

2. The electric valve according to claim 1, characterized in that, The sealing component (19) further includes an annular sealing portion (195), and the diaphragm portion (191) is located between the annular sealing portion (195) and the first cylindrical portion (192); the annular sealing portion (195) is sandwiched between the end cap (16) and the housing (26), and the annular sealing portion (195) is in a compressed state, so that the outer peripheral side of the diaphragm portion (191) is sealed with the housing (26) and the end cap (16).

3. The electric valve according to claim 1, characterized in that, The outer periphery of the diaphragm portion (191) is connected to the housing (26) and / or end cap (16) and the connection is sealed.

4. The electric valve according to claim 1, characterized in that, Another portion of the rod assembly (14) passes through the second through hole (193) and the first cylindrical portion (192) is fixed or limited relative to the rod assembly (14).

5. The electric valve according to claim 2, characterized in that, The sealing component (19) is made of rubber, and the thickness of the annular sealing part (195) is greater than the thickness at the connection between the diaphragm part (191) and the annular sealing part (195).

6. The electric valve according to any one of claims 1, 3, and 4, characterized in that, The sealing component (19) further includes an annular sealing portion (195). The sealing component (19) is made of rubber, and the thickness of the annular sealing portion (195) is greater than the thickness at the connection between the diaphragm portion (191) and the annular sealing portion (195).

7. The electric valve according to any one of claims 1-4, characterized in that, The sealing member (19) further includes an annular protrusion (194) that protrudes from the inner side of the first cylindrical portion (192) toward the rod assembly (14) and surrounds the rod assembly (14). The rod assembly (14) has an annular groove (144) that is recessed into the outer periphery of the rod assembly (14) and surrounds the rod assembly (14). The annular groove (144) corresponds to the annular protrusion (194). At least a portion of the annular protrusion (194) extends into the annular groove (144). The annular protrusion (194) abuts against the annular groove (144). The annular protrusion (194) is in a compressed state. Alternatively, the sealing member has an annular groove that is recessed into the inner side of the first cylindrical portion and surrounds the rod assembly. The rod assembly has an annular protrusion that protrudes from the outer periphery of the rod assembly and surrounds the rod assembly. At least a portion of the annular protrusion extends into the annular groove. The annular protrusion abuts against the annular groove.

8. The electric valve according to any one of claims 1-4, characterized in that, The electric valve further includes a first limiting component (21), which is located at the end of the annular sleeve (20) away from the first through hole (163). At least a portion of the outer diameter of the first limiting component (21) is larger than the inner diameter of the annular sleeve (20). A portion of the first limiting component (21) abuts against the annular sleeve (20) or the first cylindrical portion (192). The first limiting component (21) is fixed to the rod assembly (14) or is part of the rod assembly (14).

9. The electric valve according to any one of claims 1-4, characterized in that, The diaphragm portion (191) includes a first flat portion (196) located on the outermost side, a second flat portion (197) connected to the first cylindrical portion (192), and a corrugated portion (198) located between the first flat portion (196) and the second flat portion (197).

10. The electric valve according to claim 9, characterized in that, The end cap (16) includes a first stepped portion (165), and the housing (26) includes a second stepped portion (263). The first stepped portion (165) and the second stepped portion (263) are disposed opposite to each other and a receiving cavity is formed between the first stepped portion (165) and the second stepped portion (263). The annular sealing portion (195) is located in the receiving cavity. The first flattening portion (196) is sandwiched between the first stepped portion (165) and the second stepped portion (263) and is in a compressed state.

11. The electric valve according to any one of claims 1-5, characterized in that, The electric valve includes a sleeve (3), which is fixed to the end cap (16) and the connection is sealed. The sleeve (3) has a second cavity (36), and the rotor assembly (10) is located in the second cavity (36). One end of the first through hole (163) is connected to the first cavity (1), and the other end of the first through hole (163) is connected to the second cavity (36).

12. The electric valve according to claim 11, characterized in that, The sealing member (19) further includes an annular protrusion (194) that protrudes from the inner side of the first cylindrical portion (192) toward the rod assembly (14) and surrounds the rod assembly (14). The rod assembly (14) has an annular groove (144) that is recessed into the outer periphery of the rod assembly (14) and surrounds the rod assembly (14). The annular groove (144) corresponds to the annular protrusion (194). At least a portion of the annular protrusion (194) extends into the annular groove (144). The annular protrusion (194) abuts against the annular groove (144). The annular protrusion (194) is in a compressed state. Alternatively, the sealing member has an annular groove that is recessed into the inner side of the first cylindrical portion and surrounds the rod assembly. The rod assembly has an annular protrusion that protrudes from the outer periphery of the rod assembly and surrounds the rod assembly. At least a portion of the annular protrusion extends into the annular groove. The annular protrusion abuts against the annular groove.

13. The electric valve according to claim 11, characterized in that, The electric valve further includes a first limiting component (21), which is located at the end of the annular sleeve (20) away from the first through hole (163). At least a portion of the outer diameter of the first limiting component (21) is larger than the inner diameter of the annular sleeve (20). A portion of the first limiting component (21) abuts against the annular sleeve (20) or the first cylindrical portion (192). The first limiting component (21) is fixed to the rod assembly (14) or is part of the rod assembly (14).

14. The electric valve according to claim 11, characterized in that, The diaphragm portion (191) includes a first flat portion (196) located on the outermost side, a second flat portion (197) connected to the first cylindrical portion (192), and a corrugated portion (198) located between the first flat portion (196) and the second flat portion (197).

15. The electric valve according to claim 14, characterized in that, The end cap (16) includes a first stepped portion (165), and the housing (26) includes a second stepped portion (263). The first stepped portion (165) and the second stepped portion (263) are disposed opposite to each other and a receiving cavity is formed between the first stepped portion (165) and the second stepped portion (263). The annular sealing portion (195) is located in the receiving cavity. The first flattening portion (196) is sandwiched between the first stepped portion (165) and the second stepped portion (263) and is in a compressed state.

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