An electrically operated valve

Abstract

The application provides an electric valve which can improve the stall of a threaded pair. The electric valve comprises a driving assembly, a valve core assembly and a valve body, the valve core assembly and the valve body are connected in the circumferential direction of the electric valve; the driving assembly comprises a rotor and a driving rod, the driving rod comprises an outer threaded section; the valve core assembly comprises an inner threaded hole, the wall of the inner threaded hole is an inner threaded section, the inner threaded section is matched with the outer threaded section; the valve core assembly comprises a separation part, the separation part is located between the inner channel and the inner threaded hole and separates the inner channel and the inner threaded hole; the valve body comprises an end channel, the end channel and the valve core assembly are arranged in the axial direction of the electric valve; the valve body further comprises a first side channel and a second side channel which are located on the radial outer side of the valve core assembly; the inner channel and the end channel are communicated, the valve core assembly can move in the axial direction so that the inner channel and the first side channel and the second side channel are communicated or disconnected.

Description

Technical Field

[0001] This application relates to the field of thermal management technology, specifically to an electric valve for automobiles. Background Technology

[0002] Electric valves can be used in thermal management systems to control the opening, closing, or regulation of fluid passages. In related technologies, an electric valve includes a valve body, a valve core assembly, and a drive assembly. The screw of the drive assembly and the valve core assembly are threaded together to form a threaded pair. The valve body has a valve port. The drive assembly can drive the valve core assembly to move axially to contact the wall forming the valve port to close the fluid passage. The valve core assembly has a hollow structure, and the hollow part of the valve core assembly serves as an internal flow channel, which is part of the flow path of the electric valve. The threaded pair of this type of electric valve is prone to jamming due to impurities in the fluid. Utility Model Content

[0003] The purpose of this application is to provide an electric valve that can improve the stall condition of threaded pairs.

[0004] This application provides an electric valve, including a drive assembly, a valve core assembly, and a valve body, wherein the valve core assembly and the valve body are connected in the circumferential direction of the electric valve; the drive assembly includes a rotor and a drive rod, wherein the drive rod includes an external thread section;

[0005] The valve core assembly includes an internal threaded hole, the wall of which is an internal threaded section that mates with the external threaded section; the valve core assembly also includes an internal channel, and a partition is provided between the internal channel and the internal threaded hole to allow them to be spaced apart.

[0006] The valve body includes an end channel, and the end channel and the valve core assembly are arranged along the axial direction of the electric valve; the valve body also includes a first side channel and a second side channel located radially outside the valve core assembly;

[0007] The internal channel and the end channel are connected, and the valve core assembly is axially movable to connect or disconnect the internal channel from the first side channel and the second side channel.

[0008] The electric valve in this application has its internal channel and internal threaded hole spaced apart and separated by a partition. Fluid entering the internal channel will not flow directly to the threaded pair of the external and internal threaded sections, which can reduce or even prevent impurities from entering the threaded pair and thus improve the stall of the threaded pair. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the electric valve in one embodiment of this application;

[0010] Figure 2for Figure 1 Front view of the electric valve;

[0011] Figure 3 for Figure 2 A schematic cross-sectional view of the electric valve along the AA direction;

[0012] Figure 4 for Figure 3 Schematic diagram of the middle valve core assembly;

[0013] Figure 5 for Figure 3 A schematic diagram of the fluid flow path in the electric valve when the valve core assembly is in the first position;

[0014] Figure 6 for Figure 3 A schematic diagram of the fluid flow path in the electric valve when the valve core assembly is in the second position;

[0015] Figure 7 for Figure 4 A schematic diagram of the valve core body of the valve core assembly;

[0016] Figure 8 for Figure 4 A schematic diagram of the connecting parts of the central valve core assembly;

[0017] Figure 9 for Figure 3 Enlarged diagram of part B in the middle.

[0018] The reference numerals in the above figures are explained as follows:

[0019] 10-Outer cover;

[0020] 20-Drive assembly; 201-Rotor; 202-Lead screw;

[0021] 30-Bearing;

[0022] 40-Valve body; 401-First valve body section; 401a-Second side channel; 401b-End channel; 4011-Second valve port section; 402-Second valve body section; 402a-First side channel; 4021-First valve port section; 403-Third valve body section; 40a-Inner cavity; 40a1-First cavity; 40a2-Second cavity; 40a3-Drive cavity;

[0023] 50-Valve core assembly; 501-Valve core body; 501a-Inner cavity; 501a1-First opening; 5011-First valve core; 5011-First abutting surface; 5012-Second valve core; 50121-Second abutting surface; 5013-Main body; 50a-Internal channel; 502-Connector; 5021-Busset; 50211-Separator; 50212-Insertion section; 5021a-Balance hole; 5021a1-First through hole; 5021a2-Second through hole; 5021b-Insertion blind hole; 5021c-Limiting groove; 5022-Nut; 5022a-Internal threaded hole; 50221-Internal threaded section; 50222-Annular flange;

[0024] 60 - Sealing part. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0026] like Figure 1-3 As shown, Figure 1 This is a schematic diagram of the structure of the electric valve in one embodiment of this application; Figure 3 for Figure 1 Front view of the electric valve; Figure 3 for Figure 2 A schematic cross-sectional view of the electric valve along the AA direction.

[0027] The electric valve in this embodiment includes a valve core assembly 50, a valve body 40, and a drive assembly 20. The valve body 40 has a valve cavity 40a, at least a portion of the valve core assembly 50 is located in the valve cavity 40a, and the drive assembly 20 can drive the valve core assembly 50 to actuate, thereby realizing fluid switching of the electric valve. At least a portion of the drive assembly 20 can be located inside the outer casing 10 of the electric valve. The electric valve of this application can be applied in automotive air conditioning systems for refrigerant switching and flow regulation. In some other embodiments, the electric valve may also simultaneously function as a throttling element, i.e., function as an electronic expansion valve.

[0028] like Figure 4 As shown, Figure 4 for Figure 3 A schematic diagram of the structure of the middle valve core assembly 50.

[0029] The valve core assembly 50 in this embodiment includes a first valve core portion 5011, a second valve core portion 5012, and a main body portion 5013. The arrangement direction of the first valve core portion 5011, the main body portion 5013, and the second valve core portion 5012 is defined as the axial direction of the electric valve. Figure 3 The valve core assembly 50 is shown as H. It is movable relative to the valve body 40 along the axial direction of the electric valve. (See figure.) Figure 4As shown, the valve core assembly 50 has an internal channel 50a along the axial direction of the electric valve. The internal channel 50a has a first opening 501a1 at one end of the valve core assembly 50 away from the drive assembly 20. This end can be defined as the first end, and the other end is defined as the second end.

[0030] Among them, such as Figure 3 As shown, the valve body 40 has an end channel 401b located at one end of its axial direction. The end channel 401b and the valve core assembly 50 are arranged along the axial direction of the electric valve. The valve body 40 also includes a first side channel 402a and a second side channel 401a located on the side of the valve body 40. The first side channel 402a and the second side channel 401a are located radially outside the valve core assembly 50.

[0031] The internal channel 50a of the valve core assembly 50 described above has a first opening 501a1 at one end near the end channel 401b. The first opening 501a1 is connected to the end channel 401b, meaning that the internal channel 50a and the end channel 401b are always connected. Fluid flowing into the valve body 40 through the end channel 401b can enter the internal channel 50a. The valve core assembly 50 is axially movable relative to the valve body 40 along the electric valve. When the valve core assembly 50 moves axially, the internal channel 50a and the first side channel 402a can be connected or disconnected, and the internal channel 50a and the second side channel 401a can be connected or disconnected. Here, disconnection means that the internal channel 50a and the first side channel 402a and the second side channel 401a cannot be connected through the space inside the valve body 40, but may be indirectly connected through a pipeline outside the valve body 40 that is not part of the electric valve.

[0032] In this embodiment, the valve core assembly 50 and the valve body 40 are connected in the circumferential direction of the electric valve. The drive assembly 20 includes a rotor 201 and a drive rod 202. One end of the drive rod 202 is fixedly connected to the rotor 201 or indirectly connected by transmission. "Indirect transmission connection" means that the two can transmit force through other components, such as gears or springs. The drive rod 202 includes an external thread section 2021, and the valve core assembly 50 includes an internal thread section 50221 that mates with the external thread section 2021. Specifically, the valve core assembly 50 includes an internal thread hole 5022a, and the internal thread section 50221 corresponds to the wall portion of the internal thread hole 5022a. Thus, when the drive rod 202 rotates with the rotor 201, it can drive the nut portion 5022 to move axially, thereby driving the entire valve core assembly 50 to move axially.

[0033] In this embodiment, the internal channel 50a and the internal threaded hole 5022a are spaced apart, meaning that the internal channel 50a and the internal threaded hole 5022a are not directly connected. Figure 4 In the middle view, the valve core assembly 50 includes a partition 50211, which separates the internal channel 50a and the internal threaded hole 5022a.

[0034] Analysis revealed that in the prior art, the fluid in the internal flow channel flows directly to the threaded pair, making it easier for impurities in the fluid to flow to the threaded pair, thus causing the threaded pair to become blocked. However, in the technical solution of this application embodiment, the internal channel 50a and the internal threaded hole 5022a are spaced apart, so the fluid entering the internal channel 50a will not flow directly to the threaded pair of the external threaded section 2021 and the internal threaded section 20221, thereby improving the blocking of the threaded pair.

[0035] In some embodiments, the valve core assembly 50 includes a valve core body portion 501, such as Figure 5 As shown, Figure 5 for Figure 4 A schematic diagram of the structure of the valve core body 501.

[0036] The valve core body 501 may be made of metal. The valve core body 501 includes a first valve core 5011, a second valve core 5012, and a main body 5013. The arrangement direction of the first valve core 5011, the main body 5013, and the second valve core 5012 is defined as the axial direction of the electric valve.

[0037] Let's look again. Figure 3 The valve body 40 has a valve cavity 40a, which includes a first cavity 40a1 and a second cavity 40a2. A first side channel 402a of the valve body 40 is connected to the first cavity 40a1, and a second side channel 401a is connected to the second cavity 40a2. In this embodiment, the wall forming the valve cavity 40a includes a first valve port 4021 and a second valve port 4011.

[0038] The electric valve may also include a sealing part 60, which surrounds the main body 5013 of the valve core assembly 50. The sealing part 60 abuts against the outer periphery of the main body 5013 and the radial dimension of the abutment surface is D1. The sealing part 60 and the outer periphery of the main body 5013 are sealed together.

[0039] Along the axial direction of the electric valve, the first valve port 4021, the first chamber 40a1, the sealing part 60, the second chamber 40a2, and the second valve port 4011 are arranged sequentially. At least a portion of the first valve core 5011 is located in the first chamber 40a1, and at least a portion of the second valve core 5012 is located in the second chamber 40a2. The sealing part 60 prevents the first chamber 40a1 and the second chamber 40a2 from fluidly communicating through the gap between the valve core assembly 50 and the valve body 40, thereby reducing internal leakage of the electric valve.

[0040] In some embodiments, the valve body 40 may be a split structure, including a first valve body portion 401, with a sealing portion 60 separately disposed from the first valve body portion 401. The sealing portion 60 is fixedly connected or limitedly connected to the first valve body portion 401. The sealing portion 60 does not move with the valve core assembly 50. Along the radial direction of the electric valve, the sealing portion 60 is pressed between the inner side of the valve core assembly 50 and the first valve body portion 401. Specifically, the sealing portion 60 is a Glyd ring. In other embodiments, the valve core assembly 50 may include a sealing ring, which is located in a groove on the surface of the main body portion 5013. The sealing ring moves together with the valve core assembly 50. In this case, the sealing portion 60 and the first valve body portion 401 are an integral structure. The radial outer periphery of the sealing ring abuts against the inner wall of the sealing portion 60, and the radial dimension of the sealing surface is D1, that is, the radial dimension of the relatively sliding portion is D1.

[0041] For reference Figures 5 to 6 , Figure 5 for Figure 3 A schematic diagram of the fluid flow path in the electric valve when the valve core assembly 50 is in the first position; Figure 6 for Figure 3 This diagram illustrates the fluid flow path in the electric valve when the valve core assembly 50 is in the second position. Arrows indicate the flow direction of the fluid in the diagram. In this embodiment, the end channel 401b is the inlet channel, and the first side channel 402a and the second side channel 401a are the outlet channels.

[0042] Figure 5 In the first position, when the valve core assembly 50 is in the first position, the first valve core portion 5011 contacts the first valve port portion 4021. The radial dimension of the contact surface between the first valve core portion 5011 and the first valve port portion 4021 is D2. At this time, the second valve port portion 4011 is open, and the end channel 401b and the second side channel 401a are connected. The end channel 401b is connected to the internal channel 501a of the valve core assembly 50, but the internal channel 501a is not connected to the first cavity 40a1. Then the end channel 401b and the first side channel 402a are disconnected.

[0043] like Figure 6 As shown, when the valve core assembly 50 is in the second position, the second valve core portion 5012 contacts the second valve port portion 4011. The radial dimension of the contact surface between the second valve core portion 5012 and the second valve port portion 4011 is D3. At this time, the end channel 401b communicates with the first cavity 40a1 through the internal channel 501a of the valve core assembly 50, and then communicates with the first side channel 402a. The end channel 401b is not connected to the second cavity 40a2, and the end channel 401b and the second side channel 401a are disconnected.

[0044] The third position is any position between the first and second positions, where both the first valve port 4021 and the second valve port 4011 are open. Fluid entering from the end channel 401b at the bottom can flow out either from the first side channel 402a or the second side channel 401a. That is, when the valve core assembly 50 is located between the first and second positions, the end channel 401b is connected to the second chamber 40a2, and the internal channel 501a is connected to the first chamber 40a1. When the valve core assembly 50 moves between the first and second positions, it can adjust the ratio between the fluid flowing into the first chamber 40a1 and the second chamber 40a2, thereby adjusting the flow rate ratio between the first side channel 402a and the second side channel 401a. It should be noted that the flow pattern in the aforementioned figure is not unique; other flow patterns are possible, such as the second side channel 401a being the inlet channel and the first side channel 402a and the end channel 401b being the outlet channels.

[0045] As can be seen, the electric valve in the above embodiments can realize multiple channel control, specifically a three-way valve, which can improve the flexibility of the electric valve's adjustment channel.

[0046] like Figure 3 As shown, the valve body 40's valve chamber 40a further includes a drive chamber 40a3. Along the axial direction of the electric valve, the drive chamber 40a3, the first valve port 4021, and the first chamber 40a1 are arranged sequentially, with at least a portion of the drive rod 202 located in the drive chamber 40a3. The internal channel 501a of the valve core assembly 50 is also connected to the drive chamber 40a3, thereby balancing the fluid pressure in the upper and lower parts of the valve core assembly 50. In this embodiment, the valve body 40 includes a first valve body portion 401, a second valve body portion 402, and a third valve body portion 403 arranged sequentially along the axial direction. The first chamber 40a1 and the first valve port 4021 are located in the second valve body portion 402, the second chamber 40a2 and the second valve port 4011 are located in the first valve body portion 401, and the drive chamber 40a3 is located in the third valve body portion 403. The valve body 40 is separated into two parts for easier processing.

[0047] The internal channel 501a may also have an opening at the second end of the valve core assembly 50, which can be defined as a second opening. It can be seen that in this embodiment, the valve core assembly 50 itself can be used for fluid communication. Since the internal channel 50a has an opening at both ends of the valve core assembly 50, the two ends of the valve core assembly 50 can achieve fluid communication, thereby making the pressure difference between the two ends of the valve core assembly 50 small or zero, which is conducive to the stable operation of the valve core assembly 50.

[0048] like Figure 7 and Figure 8 As shown, Figure 7 for Figure 4 A schematic diagram of the valve core body 501 of the valve core assembly 50; Figure 8for Figure 4 A schematic diagram of the connecting piece 502 of the middle valve core assembly 50.

[0049] In some embodiments, the valve core assembly 50 is a split structure. The valve core assembly 50 further includes a connector 502 connected to the valve core body 501. The valve core body 501 includes a cylindrical structure, and the internal channel 50a includes an inner cavity 501a of the cylindrical structure. The internal channel 50a includes a balancing hole 5021a. The connector 502 includes a balancing hole 5021a, and the balancing hole 5021a has an opening on the outer wall of the connector 502, serving as a second opening of the internal channel 50a. The balancing hole 5021a connects the inner cavity 501a and the drive cavity 40a3. Because the axially long valve core assembly 50 is divided into two segments with smaller axial dimensions, it is convenient to machine the hollow portion inside the valve core assembly 50, especially to machine the internal threaded hole 5022a. Furthermore, since the connector 502 and the valve core body 501 are separate structures, at least some parts of the two can be made of different materials, which also allows the connector 502 and the valve core body 501 to be installed into the valve body 40 from different directions, reducing interference between them and the valve body 40 during assembly.

[0050] Specifically, connector 502 can also be a split structure. For example... Figure 8 As shown, the connector 502 includes a nut portion 5022 and a bushing portion 5021, which are connected. An internal threaded hole 5022a is located in the nut portion 5022. The bushing portion 5021 and the valve body 40 can be connected in the circumferential direction. Thus, when the drive rod 202 rotates with the rotor 201, it can drive the nut portion 5022 to move axially, thereby driving the entire valve core assembly 50 to move axially. The split-type connector 502 facilitates the machining of the internal thread section 50221 and enables connection with the valve body 40 and the valve core body portion 501.

[0051] The aforementioned balance hole 5021a can be located in the bushing portion 5021, such as... Figure 8As shown, the balance hole 5021a specifically includes a first through hole 5021a1 extending radially and a second through hole 5021a2 extending axially. One end of the second through hole 5021a2 communicates with the inner cavity 501a of the valve core body 501, and the other end of the second through hole 5021a2 communicates with the first through hole 5021a1. The first through hole 5021a1 forms a second opening on the outer wall of the bushing 5021, that is, it penetrates the outer wall of the bushing 5021. Since the first through hole 5021a1 extends radially, the axial space occupied can be reduced, and it can also be isolated from the internal threaded hole 5022a. The nut part 5022 is fixedly connected to the bushing part 5021, and the internal threaded hole 5022a is located in the nut part 5022. The nut part 5022 can be made of plastic, such as polyetheretherketone (PEEK). Since the nut part 5022 is made of plastic, the overall weight of the valve core assembly 50 can be reduced. Specifically, the nut portion 5022 can be made of polytetrafluoroethylene with low frictional resistance, which can reduce friction with the drive rod 202.

[0052] like Figure 8 As shown, the bushing portion 5021 is also provided with an insertion blind hole 5021b. At least a portion of the nut portion 5022 is inserted into the insertion blind hole 5021b. The separator portion 50221 is located between the balance hole 5021a and the insertion blind hole 5021b, that is, the separator portion 50221 is provided in the bushing portion 5021 of the connector 502. This facilitates the machining of the internal threaded hole 5022a and can also separate the internal threaded hole 5022a from the internal flow channel 50a.

[0053] Furthermore, since the diameter of a portion of the valve core body 501 is larger than the inner diameter of the second valve port 4011, the valve core assembly 50 in this embodiment is a separate unit before assembling the electric valve. The connector 502 and the valve core body 501 need to be separately installed into the valve body 40. Specifically, with... Figure 3 , Figure 4 For example, the connector 502 needs to be inserted from above the second valve port 4011, and the valve core body 501 needs to be inserted from below the second valve port 4011. Since the connector 502 includes a partition 50221, the axial length of the connector 502 is increased. During assembly, the connector 502 can be pushed axially towards the second valve port 4011, making the portion of the connector 502 extending beyond the first valve port 4021 longer, which is more conducive to welding the connector 502 to the valve core body 501.

[0054] Figure 8In the design, the wall corresponding to the insert blind hole 5021b is provided with an annular groove 5021c, and the outer peripheral wall of the nut part 5022 is provided with an annular flange 50222, which is located within the annular groove 5021c. This allows for a more reliable connection between the nut part 5022 and the bushing part 5021. For example, the bushing part 5021 can be an insert injection-molded nut part 5022. The bushing part 5021 can be made of metal and can be welded to the valve core body part 5011 for reliable connection; other connection methods are also possible. The axial length of the insert blind hole 5021b can be relatively long to improve the reliability of the connection with the nut part 5022.

[0055] The bushing portion 5021 may include a cartridge section 50212, which can be inserted into the valve core body portion 501. The bushing portion 5021 and the valve core body portion 501 can be welded or press-fitted together. This connection method is reliable and simple. The portion of the bushing portion 5021 above the cartridge section 50212 can abut against the valve core body portion 501 axially, and the abutment position can also be welded.

[0056] Please continue to combine Figure 3 and Figure 5 In this embodiment, the rotor 201 includes a cylindrical structure and a rotor cavity. When the valve core assembly 50 is in the first position, that is, in Figure 3 From this perspective, when the valve core assembly is at the top stroke dead center, at least a portion of the valve core assembly 50 is located in the rotor cavity of the rotor 201. Figure 5 As can be seen, the upper edge of the valve core assembly 50 and the lower edge of the rotor 201 have a distance h1, meaning that the upper part of the valve core assembly 50 at height h1 is located within the inner cavity of the rotor 201. It is evident that the drive rod 202 in this embodiment is relatively short, specifically, the length of the portion of the drive rod 202 excluding the external thread section 2021 is shorter. This allows it to partially reside within the inner cavity of the rotor 201 after the valve core assembly 50 moves upward. This design, on the one hand, reduces the length of the drive rod 202, increasing the stability of its transmission and better ensuring coaxiality with the valve core assembly 50; on the other hand, it avoids occupying excessive axial space when the valve core assembly 50 requires a partition 50211.

[0057] See again Figure 9 understand, Figure 9 for Figure 3 Enlarged diagram of part B in the middle.

[0058] The electric valve in this embodiment also includes a bearing 30, with a drive rod 202 passing through and supported on the bearing 30. The bearing 30 is supported and connected to the valve body 40. The drive assembly 20 also includes a connecting portion 203 connecting the rotor 201 and the drive rod 202. The radially outer end of the connecting portion 203 is connected to the inner side of the rotor 201. A through hole can be provided in the middle of the connecting portion 203, and the drive rod 202 can be inserted into the through hole. When the valve core assembly 50 is in the first position, the axial distance h2 between the bearing 30 and the connecting portion 203 can be within 1mm to 3mm. With the partition portion 50211 provided, to reduce the occupation of axial space, the drive rod 202 can be shortened, and the bearing 30 can be closer to the connecting portion 203. In this way, the bearing 30 can be closer to the rotation fulcrum adjacent to the rotor 201, resulting in a smaller magnetic ring offset, which is beneficial to ensuring rotational stability.

[0059] In some embodiments, D2 mentioned above may be less than or equal to D1, and D3 may be less than or equal to D1, because the internal flow channel 50a is always in communication with a relatively high-pressure fluid. This makes it so that when the valve core assembly 50 is in the first position, the second chamber 40a2 is at a relatively high pressure, the first chamber 40a1 is at a relatively low pressure, and the resultant force of the fluid on the valve core assembly 50 is zero or presses the valve core assembly 50 against the first valve port 4021. When the valve core assembly 50 is in the second position, the second chamber 40a2 is at a relatively low pressure, the first chamber 40a1 is at a relatively high pressure, and the resultant force of the fluid on the valve core assembly 50 is zero or presses the valve core assembly 50 against the second valve port 4011. In this way, whether the valve core assembly 50 is in the first position or the second position, the resultant force of the fluid on the valve core assembly 50 is unlikely to cause the valve core assembly 50 to disengage from the valve port, making the seals at the first valve port 4021 and the second valve port 4011 more reliable and reducing the risk of leakage. It should be noted that "relatively high pressure" refers to the fact that one of the first chamber 40a1 and the second chamber 40a2 has a higher pressure than the other, and the same applies to "relatively low pressure". Specifically, the outer periphery of the main body 5013 is cylindrical, and the outlines of the first valve port 4021 and the second valve port 4011 are both annular.

[0060] As shown in Figure 3, the first side channel 402a of the valve body 40 has an opening on the outer wall of the valve body 40, and the first side channel 402a also has an opening on the wall forming the first cavity 40a1. The second side channel 401a has an opening on the outer wall of the valve body 40, and the second side channel 401a also has an opening on the wall forming the second cavity 40a2. Fluid can flow into the first cavity 40a1 from the valve core opening 501b provided on the valve core body 501, and then flow out of the first cavity 40a1 from the first side channel 402a. Fluid can also flow out of the second cavity 40a2 from the second side channel 401a. Specifically, both the first side channel 402a and the second side channel 401a extend radially along the electric valve. The number of both the first side channel 402a and the second side channel 401a can be greater than two and are evenly distributed circumferentially along the valve body 40, making the flow field distribution more uniform.

[0061] In some other embodiments of the electric valve, if more emphasis is placed on reducing the valve opening force, D2 can be set to be greater than D1 and D3 greater than D1. Other structures of the electric valve are the same as or similar to those in the aforementioned embodiments.

[0062] When the valve core assembly 50 is in the first position, the second valve core portion 5012 is separated from the second valve port portion 4011, and the end channel 401b communicates with the second cavity 40a2 through the opening of the second valve port portion 4011. At this time, the fluid passage is sequentially: end channel 401b, second valve port portion 4011, second cavity 40a2, and second side channel 401a. When the valve core assembly 50 is in the second position, the first valve core portion 5011 is separated from the first valve port portion 4021, and the end channel 401b communicates with the first cavity 40a1 through the internal channel 50a. At this time, the fluid passage is sequentially: end channel 401b, internal channel 50a, first cavity 40a1, and first side channel 402a.

[0063] like Figure 4 As shown, the first valve core 5011 includes a first abutting surface 5011, which can abut against the first valve port 4021. The first abutting surface 5011 is arc-shaped or conical. From the second valve core 5012 to the first valve core 5011, the radial dimension of the first abutting surface 5011 gradually decreases. The angle between the first abutting surface 5011 and the axial direction of the electric valve is less than 30°, which can improve the flow regulation accuracy of the first abutting surface 5011 when the valve is first opened, so as to meet the need for flow regulation at a small flow rate in the initial stage of valve opening.

[0064] The second valve core 5012 includes a second abutment surface 50121, which can abut against the second valve port 4011. The second abutment surface 50121 is arc-shaped or conical. From the first valve core 5011 to the second valve core 5012, the radial dimension of the second abutment surface 50121 gradually decreases. The angle between the second abutment surface 50121 and the axial direction of the electric valve is less than 30°, which can improve the flow regulation accuracy of the second abutment surface 50121 when the valve is first opened, so as to meet the need for flow regulation at a small flow rate in the initial stage of valve opening.

[0065] One end of the main body 5013 of the valve core body 501 is adjacent to the first valve core 5011, and the other end of the main body 5013 is adjacent to the second valve core 5012. The outer peripheral wall of the main body 5013 extends along the axial direction of the electric valve. The radial dimension of the maximum outer diameter of the first valve core 5011 is d1, the radial dimension of the maximum outer diameter of the second valve core 5012 is d2, and the radial dimension of the main body 5013 is d3. These can be set as follows: 0.8*d3≤d1≤1.2*d3, 0.8*d3≤d2≤1.2*d3.

[0066] The aforementioned dimensional settings reduce the undulations of the outer peripheral surface of the valve core assembly 50, or in other words, minimize the radial protrusion of the first valve core portion 5011 and the second valve core portion 5012. While satisfying the flow regulation function of the electric valve, this reduces the radial space occupied by the first valve core portion 5011 and the second valve core portion 5012, resulting in a larger flow area for the first cavity 40a1 and the second cavity 40a2. Furthermore, in embodiments where the valve core assembly 50 is machined, the amount of cutting required for machining the first valve core portion 5011 and the second valve core portion 5012 can be reduced. Additionally, the smaller radial protrusion of the first valve core portion 5011 and the second valve core portion 5012 facilitates the fitting of the sealing portion 60 between them during installation. It should be noted that the "maximum outer diameter portion" of the first valve core portion 5011 and the second valve core portion 5012 refers to the portion with the largest radial dimension.

[0067] In some embodiments of the valve core assembly 50, d1 can be set to be greater than d3, d2 greater than d3, and D2 equal to D1, D3 equal to D1. This essentially cancels out the axial fluid pressure on the valve core assembly 50, and the radial dimension of the main body 5013 is relatively small. In other embodiments of the valve core assembly 50, d1 can be set to be equal to d3, d2 equal to d3, D2 less than D1, and D3 less than D1.

[0068] In some implementations, such as Figure 4As shown, the first valve core 5011, the second valve core 5012, and the main body 5013 are integrated into a single structure, reducing the number of parts and simplifying assembly. All three valve cores are made of metal. Since the electric valve in this embodiment is used in a high-pressure refrigerant environment, particularly an environment using carbon dioxide as the refrigerant, the metal materials of the first valve core 5011 and second valve core 5012 provide greater pressure resistance and are less prone to deformation compared to plastic or rubber valve cores, thus improving the reliability of the electric valve. Furthermore, the first valve core 5011, second valve core 5012, and main body 5013 can be machined from a single integral blank. Both the first valve port 4021 and the second valve port 4011 are made of metal, which, compared to plastic or rubber valve ports, provides greater pressure resistance and is less prone to deformation, further improving the reliability of the electric valve.

[0069] It should be noted that the above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described 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 the present utility model. All technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

Claims

1. An electric valve, characterized in that, The device includes a drive assembly (20), a valve core assembly (50), and a valve body (40), wherein the valve core assembly (50) and the valve body (40) are connected at the upper limit in the circumferential direction of the electric valve; the drive assembly (20) includes a rotor (201) and a drive rod (202), wherein the drive rod (202) includes an external thread section (2021). The valve core assembly (50) includes an internal threaded hole (5022a), the wall of which is an internal threaded section (50221), which mates with the external threaded section (2021); the valve core assembly (50) also includes an internal channel (50a), and includes a partition (50211), which is located between the internal channel (50a) and the internal threaded hole (5022a) and separates the internal channel (50a) and the internal threaded hole (5022a). The valve body (40) includes an end channel (401b), the end channel (401b) and the valve core assembly (50) are arranged along the axial direction of the electric valve; the valve body (40) also includes a first side channel (402a) and a second side channel (401a) located radially outside the valve core assembly (50). The internal channel (50a) and the end channel (401b) are connected, and the valve core assembly (50) is axially movable to connect or disconnect the internal channel (50a) from the first side channel (402a) and the second side channel (401a).

2. The electric valve according to claim 1, characterized in that, The valve body (40) includes a first valve port (4021) and a second valve port (4011); the valve core assembly (50) includes a first valve core (5011) and a second valve core (5012); the valve core assembly (50) is located in a first position, the first valve core (5011) contacts the first valve port (4021), and the internal channel (50a) communicates with the second side channel (401a); the valve core assembly (50) is located in a second position, the second valve core (5012) contacts the second valve port (4011), and the internal channel (50a) communicates with the first side channel (402a).

3. The electric valve according to claim 2, characterized in that, The rotor (201) includes a rotor cavity, and the valve core assembly (50) is located in a first position, with at least a portion of the valve core assembly (50) located in the rotor cavity of the rotor (201).

4. The electric valve according to claim 2, characterized in that, The electric valve also includes a bearing (30), and the drive rod (202) passes through the bearing (30); the drive assembly (20) also includes a connecting part (203) connecting the rotor (201) and the drive rod (202); the valve core assembly (50) is located in a first position, and the axial distance between the bearing (30) and the connecting part (203) is 1mm~3mm.

5. The electric valve according to any one of claims 2-4, characterized in that, The valve core assembly (50) includes a valve core body portion (501), which includes a first valve core portion (5011) and a second valve core portion (5012). The valve core assembly (50) further includes a connector (502) connected to the valve core body (501), and the internal threaded hole (5022a) is located in the connector (502).

6. The electric valve according to claim 5, characterized in that, The valve body (40) includes a drive chamber (40a3), at least a portion of the drive rod (202) is located in the drive chamber (40a3), and the drive chamber (40a3) and the first valve port (4021) are arranged sequentially along the axial direction of the electric valve. The drive chamber (40a3) is connected to the internal channel (50a) of the valve core assembly (50).

7. The electric valve according to claim 6, characterized in that, The valve core body (501) includes a cylindrical part, and the internal channel (50a) includes the inner cavity (501a) of the cylindrical part; the internal channel (50a) includes a balance hole (5021a), and the connector (502) is provided with the balance hole (5021a), and the balance hole (5021a) connects the inner cavity (501a) and the drive cavity (40a3).

8. The electric valve according to claim 7, characterized in that, The valve core assembly (50) further includes a nut portion (5022) and a bushing portion (5021), the internal threaded hole (5022a) is located in the nut portion (5022), and the balance hole (5021a) is located in the bushing portion (5021); the bushing portion (5021) is also provided with an insertion blind hole (5021b), at least a portion of the nut portion (5022) is inserted into the insertion blind hole (5021b), and the partition portion (50211) is located between the balance hole (5021a) and the insertion blind hole (5021b).

9. The electric valve according to claim 8, characterized in that, The wall corresponding to the insertion blind hole (5021b) is provided with an annular groove (5021c), and the outer peripheral wall of the nut part (5022) is provided with an annular flange (50222), which is located in the annular groove (5021c).

10. The electric valve according to claim 8, characterized in that, The valve core body (501) and the bushing (5021) are made of metal, while the nut (5022) is made of plastic.

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