Motorised valve

Abstract

An electric valve includes a valve body, a valve core, and a sealing seat. The valve body has a valve body cavity and channels. The central axis of the inner opening of at least one of the channels is parallel or nearly parallel to the rotation axis of the valve core. The valve core is located in the valve body cavity and has a channel. The central axis of the outer port of at least one of the channels is parallel to the rotation axis of the valve core. Along the rotation axis of the valve core, the sealing seat is in contact with the lower end face of the valve core or the sealing seat is in contact with the bottom wall forming the valve body cavity. The sealing seat has a through hole. When the valve core is rotated, the channel and the through hole can connect two or more of the channels. By setting the channels, channels, and sealing seat in this way, when the fluid in a certain closed channel acts on the outer surface of the valve core, it will not cause excessive compression between the valve core and the sealing seat, which is beneficial to improving the service life of the sealing seat.

Description

Technical Field

[0001] This application relates to the field of vehicle parts, specifically to an electric valve. Background Technology

[0002] Electric valves can be used in vehicle thermal management systems or air conditioning systems to control the flow of working fluids. An electric valve consists of a valve core and a sealing seat. Typically, the sealing seats are symmetrically positioned relative to the valve core, such as on both sides of the valve core. When fluid (especially high-pressure fluid) in a closed passage acts on the outer surface of the valve core, the fluid pressure may cause excessive compression between the valve core and the sealing seat on the opposite side of that closed passage. This increases frictional wear on the sealing seat and reduces its service life. Summary of the Invention

[0003] The purpose of this application is to provide an electric valve that helps to improve the service life of the sealing seat.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] An electric valve includes a valve body, a valve core, and a sealing seat. The valve body has a valve body cavity and channels. The central axis of the inner opening of at least one of the channels is parallel or nearly parallel to the rotation axis of the valve core. The valve core is located in the valve body cavity and has a channel. The central axis of the outer port of at least one of the channels is parallel or nearly parallel to the rotation axis of the valve core. Along the rotation axis of the valve core, the sealing seat is in contact with the lower end face of the valve core or the sealing seat is in contact with the bottom wall forming the valve body cavity. The sealing seat has a through hole. When the valve core is rotated, the channel and the through hole can connect two or more of the channels.

[0006] This application provides an electric valve, including a valve body, a valve core, and a sealing seat. The valve body has a valve body cavity and channels. The central axis of the inner opening of at least one of the channels is parallel or nearly parallel to the rotation axis of the valve core. The valve core is located in the valve body cavity and has a channel. The central axis of the outer port of at least one of the channels is parallel to the rotation axis of the valve core. Along the rotation axis of the valve core, the sealing seat is in contact with the lower end face of the valve core or the sealing seat is in contact with the bottom wall forming the valve body cavity. The sealing seat has a through hole. When the valve core is rotated, the channel and the through hole can connect two or more of the channels. By setting the channels, channels, and sealing seat in this way, when the fluid in a certain closed channel acts on the outer surface of the valve core, it will not cause excessive compression between the valve core and the sealing seat, which is beneficial to improving the service life of the sealing seat. Attached Figure Description

[0007] Figure 1 This is a cross-sectional structural schematic diagram of one embodiment of the first implementation of the electric valve;

[0008] Figure 2 yes Figure 1 A cross-sectional structural diagram of the central valve component;

[0009] Figure 3 yes Figure 1 A schematic diagram of a cross-sectional structure of the valve body;

[0010] Figure 4 yes Figure 1 A schematic diagram of a cross-sectional structure of the valve core;

[0011] Figure 5 yes Figure 1 A schematic diagram of a cross-sectional structure of the central sealing seat;

[0012] Figure 6 yes Figure 1 Another cross-sectional structural diagram of the electric valve;

[0013] Figure 7 This is a three-dimensional structural diagram of the valve core;

[0014] Figure 8 yes Figure 1 Another cross-sectional structural diagram of the valve body;

[0015] Figure 9 This is a schematic diagram of a three-dimensional structure of a limiting post;

[0016] Figure 10 This is a cross-sectional structural schematic diagram of one embodiment of the second implementation of the electric valve;

[0017] Figure 11 yes Figure 10 A schematic diagram of a cross-sectional structure of the valve core;

[0018] Figure 12 This is a cross-sectional structural schematic diagram of one embodiment of a third implementation of the electric valve;

[0019] Figure 13 yes Figure 12 A schematic diagram of a cross-sectional structure of the valve core. Detailed Implementation

[0020] The present application will be further described below with reference to the accompanying drawings and specific embodiments:

[0021] See Figure 1Electric valves can be applied to vehicle thermal management systems or air conditioning systems, especially in the refrigerant circulation loop of such systems, including thermal management systems for new energy vehicles. The electric valve 100 includes a drive component 1, a valve component 2, a valve body 3, and a valve core 4. The valve body 3 has a valve body cavity 30. The valve component 2 includes a valve stem 21. The valve core 4 is located in the valve body cavity 30. The valve component 2 is connected to the valve core 4 via the valve stem 21. The valve component 2 is fixedly connected to or limited by the valve body 3. The drive component 1 is located on the outer periphery of a portion of the valve component 2. The drive component 1 is fixedly connected to or limited by the valve body 3 or the valve component 2. The electric valve 100 is electrically and / or signal-connected to the outside world via the drive component 1.

[0022] See Figure 1 The drive component 1 includes a housing 11, a stator assembly 12, a circuit board 13, an interface portion 14, and a pin 15. The housing 11 and the interface portion 14 can be integrally injection molded or assembled. In this embodiment, the housing 11 and the interface portion 14 are integrally injection molded. The housing 11 forms a housing cavity 110. The stator assembly 12 and the circuit board 13 are located in the housing cavity 110. A portion of the valve component 2 is located in the housing cavity 110. The stator assembly 12 is located on the outer periphery of a portion of the valve component 2. The stator assembly 12 is electrically connected and / or signal connected to the circuit board 13. The pin 15 is connected and fixed to the interface portion 14. In this embodiment, the middle portion of the pin 15 is injection molded and fixed to the housing of the interface portion 14. One end of the pin 15 is located in the housing cavity 110 and is electrically connected and / or signal connected to the circuit board 13. The other end of the pin 15 is located in the insertion cavity formed in the interface portion 14 for electrical and / or signal connection to the outside. In this embodiment, the drive component 1 is connected and fixed or connected and limited to the valve body 3. Specifically, the drive component 1 and the valve body 3 are connected and fixed by screws. Furthermore, a sealing setting can be provided between the drive component 1 and the valve body 3, which helps to prevent moisture or other impurities in the outside air from entering the housing cavity 110 and contacting the stator assembly 12 and / or circuit board 13, causing the stator assembly 12 and / or circuit board 13 to fail.

[0023] See Figure 1 and Figure 2 The valve component 2 includes a rotor assembly 22, a transmission assembly 23, a connecting seat 24, and a sleeve 25. The sleeve 25 is connected and fixed to the connecting seat 24. In this embodiment, the sleeve 25 and the connecting seat 24 are welded and fixed. The sleeve 25 and the connecting seat 24 are assembled to form a receiving cavity 20. The rotor assembly 22 and at least part of the transmission assembly 23 are located in the receiving cavity 20. In this embodiment, part of the transmission assembly 23 is also located in the rotor cavity formed by the rotor assembly 22. This helps to reduce the axial height of the valve component 2, and thus helps to reduce the axial height of the electric valve 100.

[0024] See Figure 1 and Figure 2 The rotor assembly 22 includes a rotor 221 and a connecting member 222. The transmission assembly 23 includes a sun gear 231, a planetary gear train 232, and a fixed gear ring 233. The transmission assembly 23 can be configured with multiple planetary gear trains according to the required transmission ratio. For example, in this embodiment, along the axial direction of the transmission assembly 23, the planetary gear train 232 sequentially includes a first planetary gear train, a second planetary gear train, a third planetary gear train, and an output planetary gear train. The rotor 221 is fixedly connected to or limited by the connecting member 222, and the connecting member 222 is fixedly connected to or limited by the sun gear 231. In this embodiment, the rotor 221 and the connecting member 222 are fixed by injection molding, and the connecting member 222 and the sun gear 231 are fixed by interference fit. The fixed gear ring 233 is located on the outer periphery of at least a portion of the sun gear 231 and at least a portion of the planetary gear train 232. The fixed gear ring 233 is fixedly connected to or limited by the connecting seat 24. In this embodiment, the fixed gear ring 233 and the connecting seat 24 are fixed by riveting. The sun gear 231 meshes with the planetary gear train 232, which in turn meshes with the fixed gear ring 233. Specifically, the sun gear 231 meshes with the first planetary gear train, which in turn meshes with the second planetary gear train, which in turn meshes with the third planetary gear train, and so on, thus transmitting the driving torque to the output planetary gear train. The output planetary gear train includes an output planet carrier 2321, which can be integrally formed with the valve stem 21, or assembled and fixed, or assembled and limited. In this embodiment, the output planet carrier 2321 and the valve stem 21 are integrally formed. Thus, under the magnetic field excitation of the stator assembly 12, the rotor assembly 22 can drive the sun gear 231 to rotate. After being transmitted through multiple stages of the planetary gear train 232, the sun gear 232 drives the valve stem 21 to rotate via the output planet carrier 2321. The valve stem 21 is connected to the valve core 4, and the rotation of the valve stem 21 ultimately drives the rotation of the valve core 4.

[0025] See Figure 1 and Figure 3The valve body 3 has channels, which can be two or more. In this embodiment, the channels specifically include a first channel 31, a second channel 32, and a third channel 33. Each channel includes an enlarged section and a through section. The enlarged section is used to connect to an external pipeline, and the through section is used for fluid flow. For a single component of the valve body 3, the channel communicates with the valve body cavity 30. The opening of the channel on the outer wall of the valve body 3 is defined as the outer opening, and the opening at the other end of the channel is defined as the inner opening. Along the axial direction of the channel, the enlarged section is positioned closer to the outer opening of the channel than the through section. The central axis of the inner opening of at least one channel is parallel or nearly parallel to the rotation axis of the valve core 4. In this embodiment, the outer opening of the first channel 31 is located on one side of the valve body 3, and the outer openings of the second channel 32 and the third channel 33 are located on the same bottom side of the valve body 3. The central axes of the inner openings of the second channel 32 and the third channel 33 are parallel or nearly parallel to the rotation axis of the valve core 4. The first channel 31 includes a first through-diameter section 311, the second channel 32 includes a second through-diameter section 321, and the third channel 33 includes a third through-diameter section 331. The central axis of the first through-diameter section 311 is perpendicular or nearly perpendicular to the central axes of the second through-diameter section 321 and / or the third through-diameter section 331. The central axis of the second through-diameter section 321 is parallel or nearly parallel to the central axis of the third through-diameter section 331. For a single component of the valve body 3, the first through-diameter section 311 communicates with the valve body cavity 30, the second through-diameter section 321 communicates with the valve body cavity 30, and the third through-diameter section 331 communicates with the valve body cavity 30. The valve body 3 also includes a mounting portion 34, which is recessed inward from the bottom wall forming the valve body cavity 30 along the rotation axis of the valve core 4. The mounting portion 34 forms a mounting cavity 35. For a single component of the valve body 3, the mounting cavity 35 communicates with the valve body cavity 30 and communicates with at least one of the channels. In this embodiment, the mounting portion 34 includes a first mounting portion 34a and a second mounting portion 34b. The first mounting portion 34a forms a first mounting cavity 35a, and the second mounting portion 34b forms a second mounting cavity 35b. For a single component of the valve body 3, the first mounting cavity 35a communicates with the second channel 32, and the central axis of the first mounting cavity 35a may coincide with or nearly coincide with the central axis of the second through-diameter section 321. The second mounting cavity 35b communicates with the third channel 33, and the central axis of the second mounting cavity 35b coincides with or nearly coincides with the central axis of the third through-diameter section 331. The valve body 3 also includes an opening portion 36, which forms an oral cavity 37. For a single component of the valve body 3, the oral cavity 37 communicates with the valve body cavity 30, and the outer opening of the oral cavity 37 is located on a side of the valve body 3 different from the channel opening side.

[0026] See Figures 1 to 4The valve core 4 is located in the valve body cavity 30, and a portion of the valve component 2 is located in the opening 37. In this embodiment, the valve component 2 and the valve body 3 are clamped and fixed by a clamping nut 26. Specifically, the clamping nut 26 is located on the outer periphery of the connecting seat 24, and at least a portion of the clamping nut 26 is located in the opening 37. The clamping nut 26 is threaded into the opening 36, clamping the flange 241 of the connecting seat 24 between the clamping nut 26 and the opening 36, thereby achieving the clamping and fixing of the valve component 2 and the valve body 3. Furthermore, a sealing setting can be provided between the valve component 2 and the valve body 3 to prevent the working fluid from leaking out from the assembly gap between the valve component 2 and the valve body 3. In this embodiment, the valve core 4 is a columnar valve core. Setting the valve core 4 as a columnar shape facilitates the processing and forming of the valve core 4. The end face of the valve core 4 near the transmission component 23 along the axial direction is defined as the upper end face, and the end face of the valve core 4 away from the transmission component 23 is defined as the lower end face. The valve core 4 includes a first groove 41. Along the axial direction of the valve core 4, the first groove 41 is recessed inward from the upper end face of the valve core 4. The first groove 41 forms a first cavity 42. At least part of the valve stem 21 is located in the first cavity 42. During the rotation, the valve stem 21 can abut against the first groove 41, thereby driving the valve core 4 to rotate.

[0027] See Figure 1 , Figure 3 and Figure 5 The electric valve 100 also includes a sealing seat 5, which can be integrally injection molded. The sealing seat 5 includes a first part 51 and a second part 52, which can be connected. The central axis of the first part 51 coincides with or nearly coincides with the central axis of the second part 52. The sealing seat 5 has a through hole 53, which extends through the sealing seat 5. Specifically, one end of the through hole 53 is located on the free end face of the first part 51, and the other end of the through hole 53 is located on the free end face of the second part 52. The sealing seat 5 also includes a stepped surface 54, which is formed between the first part 51 and the second part 52, and the stepped surface 54 is part of the first part 51. In this embodiment, see... Figure 1The sealing seat 5 specifically includes a first sealing seat 5a and a second sealing seat 5b. At least a portion of the first sealing seat 5a is located in the first mounting cavity 35a. The first sealing seat 5a is connected and fixed or limited to the first mounting part 34a, specifically through an interference fit. The through hole 53a of the first sealing seat communicates with the second channel 32. More specifically, the through hole 53a of the first sealing seat communicates with the second through diameter section 321. To stabilize the flow of the working fluid, the central axis of the through hole 53a of the first sealing seat can be made to coincide with or nearly coincide with the central axis of the second through diameter section 321. The diameter of the through hole 53a of the first sealing seat is similar to that of the second through diameter section 321. The diameters of the through sections 321 are equal or nearly equal; similarly, at least a portion of the second sealing seat 5b is located in the second mounting cavity 35b, and the second sealing seat 5b is connected and fixed or connected and limited to the second mounting part 34b, specifically through interference fit limitation. The through hole 53b of the second sealing seat is connected to the third channel 33, and more specifically, the through hole 53b of the second sealing seat is connected to the third through section 331. The central axis of the through hole 53b of the second sealing seat may coincide with or nearly coincide with the central axis of the third through section 331, and the diameter of the through hole 53b of the second sealing seat may be equal to or nearly equal to the diameter of the third through section 331. The valve core 4 is located in the valve body cavity 30. The lower end face of the valve core 4 is tightly fitted with the free end face of the sealing seat 5. More specifically, the lower end face of the valve core 4 is tightly fitted with the free end face of the first part 51 of the sealing seat. The lower end face of the valve core 4 can slide with the free end face of the sealing seat 5. The lower end face of the valve core 4 is a plane, and the free end face of the first part 51 can be a plane or a near-plane arc-shaped surface. In this way, a planar seal is formed between the valve core 4 and the sealing seat 5 through the end face. Compared with a seal formed between the valve core 4 and the sealing seat 5 through an arc surface, this facilitates the processing and forming of the sealing seat 5 and helps to ensure a tight fit of the sealing surfaces, thus ensuring sealing performance. In this embodiment, the lower end face of the valve core 4 is tightly fitted with the free end face of the first part 51a of the first sealing seat and the free end face of the first part 51b of the second sealing seat, respectively.

[0028] See Figure 1 and Figure 3The electric valve 100 also includes a seal 6, the number of which is the same as the number of sealing seats 5. The seal 6 is located on the outer periphery of a portion of the sealing seat 5. More specifically, the seal 6 is located on the outer periphery of the second part 52 of the sealing seat. The seal 6 is located in the mounting cavity 35. The seal 6 abuts against the stepped surface 54 of the sealing seat and the bottom wall of the mounting part 34, respectively. Along the axial direction of the mounting cavity 35, the seal 6 is pressed between the stepped surface 54 and the bottom wall of the mounting part 34, and the seal 6 is in a sealed and pressed state. In this embodiment, the sealing element 6 specifically includes a first sealing element 6a and a second sealing element 6b. The first sealing element 6a is located on the outer periphery of the second part of the first sealing seat 5a and in the first mounting cavity 35a. The first sealing element 6a abuts against the stepped surface of the first sealing seat 5a and the bottom wall of the first mounting part 34a, respectively. Along the axial direction of the first mounting cavity 35a, the first sealing element 6a is pressed between the stepped surface of the first sealing seat 5a and the bottom wall of the first mounting part 34a, and the first sealing element 6a is in a sealed and pressed state. Similarly, the second sealing element 6b is located on the outer periphery of the second part of the second sealing seat 5b and in the second mounting cavity 35b. The second sealing element 6b abuts against the stepped surface of the second sealing seat 5b and the bottom wall of the second mounting part 34b, respectively. Along the axial direction of the second mounting cavity 35b, the second sealing element 6b is pressed between the stepped surface of the second sealing seat 5b and the bottom wall of the second mounting part 34b, and the second sealing element 6b is in a sealed and pressed state. The sealing element 6 serves two purposes: firstly, it improves the sealing performance when the sealing seat 5 is assembled with the mounting part 34, reducing the risk of external leakage; secondly, under the elastic force of the sealing element 6, it helps to compensate for the frictional loss between the lower end face of the valve core 4 and the free end face of the sealing seat 5, ensuring a tight fit between the lower end face of the valve core 4 and the free end face of the sealing seat 5, thus guaranteeing its sealing performance.

[0029] See Figure 1 and Figure 4The valve core 4 has channels, and the number of channels is two or more. At least one of the channels has its outer port located on the lower end face of the valve core 4, or in other words, the central axis of the outer port of at least one channel is parallel or nearly parallel to the rotation axis of the valve core 4. The port of the channel located on the outer wall surface of the valve core 4 is defined as the outer port, and the other end port of the channel is defined as the inner port. In this embodiment, the valve core 4 has a first channel 43 and a second channel 44. The central axis of the first channel 43 is perpendicular or nearly perpendicular to the central axis of the second channel 44. The first channel 43 is disposed through the valve core 4. The two outer ports of the first channel 43 are respectively located on the side wall surface of the valve core 4. The wall surface connecting the upper end face and the lower end face of the valve core 4 along the axial direction of the valve core 4 is defined as the side wall surface, which can be an arc surface. The second channel 44 communicates with the first channel 43. The outer port of the second channel 44 is located on the lower end face of the valve core 4, and the inner port of the second channel 44 is located on the annular wall surface forming the first channel 43. In this embodiment, the first channel 43 is connected to the first cavity 42, and along the axial direction of the valve core 4, the first channel 43 is located between the first cavity 42 and the second channel 44. Of course, in other embodiments, the first channel 43 and the first cavity 42 may not be connected. Connecting the first channel 43 to the first cavity 42 helps to quickly stabilize or balance the fluid pressure on the upper and lower surfaces of the valve core 4. The diameter of the first channel 43 is defined as D1, and the diameter of the second channel 44 is defined as D2. Since the first channel 43 and the second channel 44 are approximately perpendicular, setting D1 > D2 helps to reduce pressure loss when the fluid flows through an approximately right-angle bend.

[0030] See Figure 1 , Figure 4 and Figure 6 By rotating the valve core 4, the channel of the valve core 4 can connect two or more channels. In this embodiment, the electric valve 100 includes, but is not limited to, two operating modes. When the valve core 4 rotates to... Figure 1 In the first position shown, the first channel 31 is connected to the first orifice 43, and the second orifice 44 is connected to the second channel 32 through the through hole of the first sealing seat 5a. At this time, the third channel 33 is not connected. The central axis of the first channel 31 can coincide with or nearly coincide with the central axis of the first orifice 43, and the central axis of the second orifice 44 can coincide with or nearly coincide with the central axis of the through hole of the first sealing seat 5a. The diameter D2 of the second orifice 44 can be equal to or nearly equal to the diameter of the through hole of the first sealing seat 5a, which is beneficial for the stable flow of the working fluid. When the valve core 4 rotates to... Figure 6In the second position, the first channel 31 is connected to the first hole 43, and the second hole 44 is connected to the third channel 33 through the through hole of the second sealing seat 5b. At this time, the second channel 32 is not connected. The central axis of the first channel 31 may coincide with or nearly coincide with the central axis of the first hole 43, and the central axis of the second hole 44 may coincide with or nearly coincide with the central axis of the through hole of the second sealing seat 5b. The diameter D2 of the second hole 44 may be equal to or nearly equal to the diameter of the through hole of the second sealing seat 5b. It should be noted that: Figure 1 and Figure 6 The image shown is of a three-way electric valve; however, electric valves are not limited to this type. Figure 1 and Figure 6 In the embodiments shown, the electric valve can also be a two-way valve, a four-way valve, or other multi-way valve.

[0031] See Figure 1 The electric valve 100 also includes a thrust bearing 7, which is located on the outer periphery of a portion of the valve stem 21. At least a portion of the thrust bearing 7 is located in the valve body cavity 30. Along the axial direction of the thrust bearing 7, the thrust bearing 7 is located between the connecting seat 24 and the valve core 4. The thrust bearing 7 abuts against both the connecting seat 24 and the valve core 4. Specifically, along the axial direction of the thrust bearing 7, the end face of the thrust bearing 7 closest to the connecting seat 24 is defined as the upper end face, and the end face of the thrust bearing 7 furthest from the connecting seat 24 is defined as the lower end face. The upper end face of the thrust bearing 7 abuts against the bottom wall of the connecting seat 24, and the lower end face of the thrust bearing 7 abuts against the upper end face of the valve core 4. Figure 1 For example, when the working fluid, especially a high-pressure fluid such as CO2 refrigerant (with a maximum working pressure of 17 MPa), acts on the lower end face of the valve core 4 through the third channel 33, a thrust bearing 7 is provided. On the one hand, this allows the pressure of the fluid acting on the lower end face of the valve core 4 to be transmitted to the thrust bearing 7. Compared to the existing sealing structure of electric valves, this avoids the transmission of the back pressure of the fluid acting on the valve core to the sealing seat, thus preventing excessive compression between the valve core and the sealing seat. This helps reduce wear and tear during the sliding process of the valve core and the sealing seat, and improves the service life of the sealing seat. On the other hand, the thrust bearing 7 helps reduce the rotational frictional resistance between the valve core 4 and the thrust bearing 7 under the action of fluid pressure, and helps reduce the driving force required for the electric valve 100 to rotate the valve core 4. However, correspondingly, with... Figure 1For example, when a high-pressure fluid, such as CO2 refrigerant, acts on the lower end face of the valve core 4 through the third channel 33, the axial height of the valve core 4 should not be too thin to ensure its strength under high-pressure fluid pressure. On the other hand, if the axial height of the valve core 4 is too thin, the pressure exerted by the high-pressure fluid on the lower end face of the valve core 4 may cause excessive force concentration on the thrust bearing 7 when transmitted to the thrust bearing 7, thus aggravating the wear of the thrust bearing 7 and shortening its service life. Therefore, the axial height of the valve core 4 is defined as H, and the cross-sectional width of the fluid acting on the lower end face of the valve core 4 is defined as W, where H ≥ 3W.

[0032] See Figures 6 to 9 The valve core 4 also includes a limiting structure. In this embodiment, the limiting structure is a limiting groove 45. Along the radial direction of the valve core 4, the limiting groove 45 is recessed inward from the side wall surface of the valve core 4. The groove formed by the limiting groove 45 may or may not be connected to the first channel 43. Correspondingly, the valve body 3 also includes a hole 38, which forms a cavity 39. The cavity 39 is disposed through the side wall surface of the valve body 3. For a single component of the valve body 3, the cavity 39 is connected to the valve body cavity 30. The electric valve 100 also includes a limiting post 8. Part of the limiting post 8 is located in the cavity 39, and the other part of the limiting post 8 extends into the valve body cavity 30 and is located in the groove formed by the limiting groove 45. The cavity, the limiting post 8 and the hole 38 are connected and fixed or connected for limiting. Furthermore, a sealing arrangement can be made between the limiting post 8 and the hole 38 to prevent fluid in the valve body cavity 30 from leaking out through the assembly gap between the limiting post 8 and the hole 38. In this embodiment, the limiting post 8 and the hole 38 are sealed and fixed by welding. The hole 38 also includes a first step 381, and correspondingly, the limiting post 8 includes a second step 81. When the limiting post 8 and the hole 38 are assembled, the second step 81 abuts against the first step 381. The step portion helps control the length of the cavity formed by the limiting post 8 in the limiting groove 45. During the rotation of the valve core 4, the limiting groove 45 can abut against the limiting post 8, thereby limiting the angle through which the valve core 4 rotates, ensuring the positioning of the valve core 4 at different positions during rotation, and ensuring the alignment of the second hole 44 with the second channel 32 or the second hole 44 with the third channel 33 of the valve core 4. Of course, as another implementation method, the limiting structure can also be set in the transmission component or other locations.

[0033] See Figure 10 and Figure 11This is a second embodiment of the electric valve 100'. The main difference between the second and first embodiments is that in the second embodiment, the sealing seat is disposed on the valve core. Specifically, the valve core 4' includes a mounting portion 34', which is recessed inward from the lower end face of the valve core 4' along the direction of its rotation axis. In this embodiment, the mounting portion 34' includes a first mounting portion 34a' and a second mounting portion 34b'. The first mounting portion 34a' forms a first mounting cavity 35a', and the second mounting portion 34b' forms a second mounting cavity 35b'. The outer port of the second channel 44' of the valve core 4' is located on the bottom wall of the first mounting portion 34a'. For a single component of the valve core 4', the second channel 44' communicates with the first mounting cavity 35a'. At least a portion of the first sealing seat 5a is located in the first mounting cavity 35a', and the through hole of the first sealing seat 5a communicates with the second channel 44'. At least a portion of the second sealing seat 5b is located in the second mounting cavity 35b'. It should be noted that the through hole of the second sealing seat 5b allows the fluid in the channel to act mainly on the valve core 4' rather than the second sealing seat 5b, which is beneficial to improving the service life of the second sealing seat 5b. Of course, in other embodiments, the second sealing seat 5b may not include the through hole. The first sealing element 6a is located in the first mounting cavity 35a'. Along the axial direction of the first mounting cavity 35a', the first sealing element 6a abuts against the stepped surface of the first sealing seat 5a and the bottom wall of the first mounting portion 34a', respectively. The first sealing element 6a is pressed between the stepped surface of the first sealing seat 5a and the bottom wall of the first mounting portion 34a', and is in a sealed and pressed state. Similarly, the second sealing element 6b is located in the second mounting cavity 35b'. Along the axial direction of the second mounting cavity 35b', the second sealing element 6b abuts against the stepped surface of the second sealing seat 5b and the bottom wall of the second mounting portion 34b', respectively. The second sealing element 6b is pressed between the stepped surface of the second sealing seat 5b and the bottom wall of the second mounting portion 34b', and is in a sealed and pressed state. The other structures of the second embodiment are basically the same as those of the first embodiment, and will not be described in detail here.

[0034] See Figures 12 to 13This is a third embodiment of the electric valve 100. The main difference between the third and second embodiments is that the first sealing seat 5a and the second sealing seat 5b can be integrally formed. Specifically, in this embodiment, the valve core 4" includes a mounting portion 34", which is recessed inward from the lower end face of the valve core 4" along its axial direction. The mounting portion 34" includes a mounting cavity 35", at least a portion of the sealing seat 5 is located in the mounting cavity 35", and the through hole 53 of the sealing seat 5 communicates with the second channel 44" of the valve core 4". The sealing member 6 is located in the mounting cavity 35", and along its axial direction, the sealing member 6 abuts against the stepped surface of the sealing seat 5 and the bottom wall of the mounting portion 34", respectively. The sealing member 6 is pressed between the stepped surface 54 and the bottom wall of the mounting portion 34", and is in a sealed and pressed state. The other structures of the third embodiment are basically the same as those of the first embodiment and will not be described in detail here.

[0035] It should be noted that the above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. For example, the directional definitions such as "front", "back", "left", "right", "up", and "down" are used. Although this specification has described this application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. An electric valve, comprising a valve body, a valve core, and a sealing seat, characterized in that: The valve body has a valve body cavity and channels. The central axis of the inner opening of at least one of the channels is parallel or nearly parallel to the rotation axis of the valve core. The valve core is located in the valve body cavity. The valve core has a passage. The central axis of the outer port of at least one of the passages is parallel or nearly parallel to the rotation axis of the valve core. Along the rotation axis of the valve core, the sealing seat is fitted with the lower end face of the valve core or the sealing seat is fitted with the bottom wall forming the valve body cavity. The sealing seat has a through hole. When the valve core is rotated, the passage and the through hole can connect two or more of the channels. The passage includes a first... The valve body has a first channel and a second channel. The central axis of the first channel is perpendicular or nearly perpendicular to the central axis of the second channel. The first channel is connected to the second channel and passes through the valve core. The channel includes a first channel, a second channel, and a third channel. The outer opening of the first channel is located on one side of the valve body. The outer openings of the second channel and the third channel are located on the other side of the valve body. The inner opening of the second channel is parallel or nearly parallel to the rotation axis of the valve core. The inner opening of the third channel is parallel or nearly parallel to the rotation axis of the valve core.

2. The electric valve according to claim 1, characterized in that: The electric valve also includes a mounting portion. Along the rotation axis of the valve core, the mounting portion is recessed inward from the bottom wall of the valve body cavity or recessed inward from the lower end face of the valve core. The mounting portion forms a mounting cavity, and at least a portion of the sealing seat is located in the mounting cavity. The sealing seat is connected and fixed or connected and limited to the mounting portion. The lower end face of the valve core or the bottom wall forming the valve body cavity is a plane.

3. The electric valve according to claim 2, characterized in that: The electric valve also includes a seal located in the mounting cavity. The sealing seat includes a stepped surface. Along the axial direction of the mounting cavity, the seal abuts against the stepped surface and the bottom wall of the mounting portion, respectively, and the seal is pressed between the stepped surface and the bottom wall of the mounting portion.

4. The electric valve according to claim 2 or 3, characterized in that: The electric valve further includes a valve component and a thrust bearing. The valve component includes a connecting seat. The valve component is connected and fixed to the valve body or connected and limited by the connecting seat. At least part of the thrust bearing is located in the valve body cavity. Along the axial direction of the thrust bearing, the thrust bearing is located between the connecting seat and the valve core. The upper end face of the thrust bearing abuts against the connecting seat, and the lower end face of the thrust bearing abuts against the valve core.

5. The electric valve according to claim 4, characterized in that, The central axis of the outer port of the second channel is parallel or nearly parallel to the rotation axis of the valve core. The diameter of the first channel is defined as D1, and the diameter of the second channel is defined as D2. The two satisfy the relationship: D1 > D2.

6. The electric valve according to claim 5, characterized in that: The mounting cavity is located in the valve body, and the mounting cavity includes a first mounting cavity and a second mounting cavity. The sealing seat includes a first sealing seat and a second sealing seat. At least a portion of the first sealing seat is located in the first mounting cavity, and the through hole of the first sealing seat communicates with the second channel. At least a portion of the second sealing seat is located in the second mounting cavity, and the through hole of the second sealing seat communicates with the third channel.

7. The electric valve according to claim 6, characterized in that: The electric valve includes two working modes. When the valve core rotates to the first position, the first channel is connected to the first orifice, the second orifice is connected to the second channel through the through hole of the first sealing seat, and the third channel is not connected. When the valve core rotates to the second position, the first channel is connected to the first orifice, the second orifice is connected to the third channel through the through hole of the second sealing seat, and the second channel is not connected.

8. The electric valve according to claim 7, characterized in that: The axial height of the valve core is defined as H, and the cross-sectional width of the fluid acting on the lower end face of the valve core is defined as W. The two satisfy the relationship: H≥3W.

9. The electric valve according to any one of claims 7-8, characterized in that: The valve core also includes a limiting groove, which is recessed inward from the side wall of the valve core along the radial direction of the valve core; the electric valve also includes a limiting post, which is connected and fixed to the valve body or connected for limiting, and part of the limiting post is located in the cavity formed by the limiting groove. The limiting groove can abut against the limiting post. When the limiting groove abuts against the limiting post, the second channel is aligned with the second channel or the second channel is aligned with the third channel.

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