Expansion valve, heat pump management system and vehicle

Abstract

The utility model relates to an expansion valve, a heat pump management system and a vehicle, and the expansion valve comprises a valve body which is constructed to be in a hollow shaft shape and is sequentially provided with a valve body cavity, a transition cavity and a valve cavity cavity in the axial direction; the valve needle can be axially arranged in the valve body in a reciprocating mode and is attached to the inner wall of the transition cavity, the inner wall of the transition cavity is provided with an axially-through first flow guide channel, and the valve body cavity is communicated with the valve opening cavity through the first flow guide channel. The transition cavity is provided with the first flow guide channel and the valve cavity for communicating the valve body cavity and the cooling medium to circulate, the circulation area of the cooling medium is increased, circulation of the cooling medium between the valve body cavity and the valve cavity is accelerated, the pressure difference between the valve body cavity and the valve cavity can be effectively reduced, and therefore the situation that the valve body is damaged due to too large pressure difference is reduced. The problems that the valve needle is low in sensitivity and slow in response due to the fact that the moving resistance of the valve needle is increased are solved, the response sensitivity of the valve needle is improved, and the response time is shortened.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicles, and in particular, to an expansion valve, a heat pump management system and a vehicle. Background Art

[0002] The expansion valve is mainly used in the heat pump management system of the vehicle. Its working medium is the gas cooling medium. When working, the valve needle moves axially to change the size of the two cavities connected to the outside, thereby adjusting the flow of the cooling medium flowing through the expansion valve. The expansion valve has a cavity inside, and the cavity inside the expansion valve is easy to form a closed space, which is easy to form a large pressure difference with the two cavities through which the gas cooling medium flows. At this time, due to the large pressure difference, it is easy to apply additional pressure to the valve needle during the movement of the valve needle, resulting in the problem of slow response of the valve needle and reduced sensitivity. Utility Model Content

[0003] The purpose of the present disclosure is to provide an expansion valve, a heat pump management system and a vehicle to solve the problem of slow response of the expansion valve needle in the related art.

[0004] In order to achieve the above object, the present disclosure provides an expansion valve, comprising:

[0005] The valve body is constructed in a hollow shaft shape and is provided with a valve body cavity, a transition cavity and a valve cavity in sequence in the axial direction; and

[0006] The valve needle can be axially reciprocated in the valve body and fits against the inner wall of the transition chamber.

[0007] Wherein, an inner wall of the transition cavity is provided with an axially penetrating first flow guide channel, and the first flow guide channel connects the valve body cavity with the valve cavity.

[0008] Optionally, the first flow guide channel is a flow guide groove, which extends axially with a notch facing the valve needle.

[0009] Optionally, there are two guide grooves, and the two guide grooves are arranged opposite to each other.

[0010] Optionally, the expansion valve comprises a valve seat mounted on one end of the valve body close to the valve cavity, the valve seat having a valve seat cavity capable of communicating with the valve cavity,

[0011] The valve needle comprises:

[0012] The main body part moves axially back and forth in a form of being in close contact with the inner wall of the transition chamber; and

[0013] The needle tip is arranged at one end of the main body close to the valve seat, and is used to extend into the valve seat cavity to separate the valve seat cavity from the valve cavity during axial reciprocating motion, or to withdraw from the valve seat cavity to connect the valve seat cavity with the valve cavity.

[0014] Optionally, an end of the main body portion facing away from the needle tip portion is formed with an opening to form a valve needle cavity.

[0015] The valve needle is provided with a second flow guide channel extending from the main body to the needle tip, and the valve needle cavity, the second flow guide channel and the valve cavity are connected in sequence.

[0016] Optionally, the expansion valve comprises:

[0017] A pressure ring is fixed to the opening end of the valve needle cavity,

[0018] A push rod, used to push the valve needle in the axial direction, the push rod extends from the open end into the valve needle cavity and is provided with a radially protruding limiting protrusion inside the valve needle cavity, the limiting protrusion being axially limited by the pressure ring; and

[0019] The elastic member elastically presses against the limiting protrusion and the bottom of the valve needle cavity in the axial direction.

[0020] Optionally, the expansion valve further comprises a T-shaped piece arranged in the valve needle cavity, wherein a transverse end of the T-shaped piece abuts against a bottom of the valve needle cavity.

[0021] The elastic member is a compression spring, one end of which is sleeved on the push rod, and the other end is sleeved on the outer side of the longitudinal end of the T-shaped member. The compression spring elastically presses between the limiting protrusion and the transverse end of the T-shaped member.

[0022] Optionally, the needle tip portion is a gradually tapering structure that decreases from one end close to the main body portion to the other end.

[0023] Optionally, a peripheral wall of the valve cavity is provided with a first through hole for connecting the valve cavity to the outside.

[0024] Optionally, sealing rings are respectively provided on the outer periphery of the valve body and the outer periphery of the valve seat.

[0025] Optionally, the expansion valve further includes:

[0026] A push rod, used to push the valve needle in the axial direction;

[0027] A valve core is sleeved on the outside of the push rod and fixed in the valve body cavity, wherein the push rod is threadably matched with the valve core; and

[0028] The driving assembly is used to provide the push rod with a driving force for rotating around an axis.

[0029] Optionally, the drive assembly includes a magnetic rotor that can be driven to rotate by an energized coil, one end of the push rod is fixedly connected to the magnetic rotor, and the other end is used to push the valve needle in the axial direction.

[0030] Optionally, the magnetic rotor is sleeved on the outside of the valve core, and the expansion valve also includes a limit member fixedly connected to the inner wall of the magnetic rotor, and a radially protruding stop platform is provided at the end of the valve core away from the valve needle, and the stop platform is used to limit the displacement of the limit member away from the valve needle.

[0031] Optionally, the limiting member is a coil spring sleeved on the outside of the valve core, and a spiral channel matching the coil spring is formed on the outer peripheral surface of the valve core.

[0032] Optionally, the expansion valve further comprises a cover body, wherein the cover body is disposed on the valve body and encloses a receiving cavity with the valve body, and the push rod, the valve core and the magnetic rotor are at least partially disposed in the receiving cavity.

[0033] According to a second aspect of the present disclosure, a heat pump management system is provided, comprising the above-mentioned expansion valve.

[0034] According to a third aspect of the present disclosure, a vehicle is provided, comprising the above-mentioned heat pump management system.

[0035] Through the above technical scheme, a first flow guide channel is set on the transition cavity to connect the valve body cavity and the valve cavity through which the cooling medium circulates, thereby increasing the circulation area of ​​the cooling medium and accelerating the circulation of the cooling medium between the two. The pressure difference between the valve body cavity and the valve cavity can be effectively reduced, thereby reducing the low sensitivity and slow response of the valve needle caused by the increased resistance to the movement of the valve needle due to the excessive pressure difference between the two, thereby improving the sensitivity of the valve needle response and shortening the response time.

[0036] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0038] Figure 1 is an exploded view of an expansion valve according to an embodiment of the present disclosure.

[0039] Figure 2It is a schematic diagram of a closed state of an expansion valve according to an embodiment of the present disclosure.

[0040] Figure 3 is a schematic diagram of an open state of an expansion valve according to an embodiment of the present disclosure.

[0041] Figure 4 It is a schematic diagram of the cooperation between a valve needle and a valve body in an expansion valve according to an embodiment of the present disclosure.

[0042] Figure 5 It is a schematic diagram of the cooperation between a valve needle and a valve body (with the related components contained inside the valve needle cavity removed) in an expansion valve according to an embodiment of the present disclosure.

[0043] Description of Reference Numerals

[0044] 1-valve body; 101-valve body cavity; 102-valve cavity; 1021-first through hole; 103-valve seat cavity; 1031-second through hole; 11-first guide channel; 12-stop platform; 13-transition cavity; 14-valve seat; 15-sealing ring; 16-valve core; 2-valve needle; 201-valve needle cavity; 202-second guide channel; 21-main body; 22-needle tip; 31-coil; 32-magnetic rotor; 321-rotor insert; 4-push rod; 41-limiting protrusion; 5-limiting member; 61-pressure ring; 62-elastic member; 63-T-shaped member; 7-cover body. DETAILED DESCRIPTION

[0045] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0046] In the present disclosure, unless otherwise specified, directional words such as "inner" and "outer" are defined with respect to the outline of the corresponding component. The use of the terms "first, second" and the like is intended to distinguish different components and does not have order or importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements.

[0047] According to one embodiment of the present disclosure, Figures 1 to 5As shown, an expansion valve can be provided, including a valve body 1 and a valve needle 2, wherein the valve body 1 is constructed in a hollow shaft shape, and a valve body cavity 101, a transition cavity 13, and a valve cavity 102 are sequentially arranged in the axial direction. The valve needle 2 can be axially reciprocated in the valve body 1, and fits against the inner wall of the transition cavity 13. It should be noted that the fit here means that the valve needle 2 and the transition cavity 13 are basically fitted, and considering the factors of processing error and the relative displacement between the two, the two can be in contact but with a tiny gap invisible to the naked eye, so that the valve needle 2 and the transition cavity 13 can move smoothly without getting stuck, wherein the inner wall of the transition cavity 13 is provided with an axially through first guide channel 11, and the first guide channel 11 connects the valve body cavity 101 with the valve cavity 102. Here, the first guide channel 11 can be opened inside the inner wall of the transition cavity 13, or it can be opened on the contact surface between it and the valve needle 2, and the present disclosure does not limit this.

[0048] Through the above technical solution, a first flow guide 11 is set on the transition cavity 13 to connect the valve body cavity 101 and the valve cavity 102 where the cooling medium flows, thereby increasing the flow area of ​​the cooling medium and accelerating the flow of the cooling medium between the two. The pressure difference between the valve body cavity 101 and the valve cavity 102 can be effectively reduced, thereby reducing the low sensitivity and slow response of the valve needle 2 caused by the increased movement resistance of the valve needle 2 due to the excessive pressure difference between the two, thereby improving the sensitivity of the valve needle 2 response and shortening the response time. According to the present technical solution, the connection between the valve body cavity 101 and the valve cavity 102 depends on the channel on the inner wall of the transition cavity 13, without opening a channel on the valve needle 2 to destroy the structure of the valve needle. For example, according to the embodiment to be mentioned below, the valve needle 2 can have self-rotation movement. In this case, its outer peripheral surface can be set as a circular surface, which fits the transition cavity 13, and there is no need to open a plane (i.e., flat position) on the outer periphery of the valve needle 2, thereby reducing the resistance during rotation.

[0049] Furthermore, if Figures 2 to 5 As shown, the first flow guide channel 11 can be a flow guide groove, and the flow guide groove extends axially and the notch faces the valve needle 2. In this way, during the expansion valve manufacturing process, only two flow guide grooves need to be drawn on the inner wall of the transition chamber 13. Compared with the structure in which the first flow guide channel 11 is set in the inner wall, there is no need for special tools to drill out a small flow channel, which is convenient for manufacturing. In addition, the number of flow guide grooves is two, and the two flow guide grooves are arranged oppositely so that the cooling medium can pass through the opposite sides of the valve needle 2 at the same time to reduce the impact on the movement of the valve needle 2. The number of flow guide grooves can also be multiple, and the multiple flow guide grooves can be arranged at equal intervals, which is not limited in this disclosure.

[0050] According to one embodiment of the present disclosure, Figures 1 to 5As shown, the expansion valve includes a valve seat 14 installed at one end of the valve body 1 close to the valve cavity 102, the valve seat 14 has a valve seat cavity 103 that can communicate with the valve cavity 102, and the valve needle 2 can include a main body 21 and a needle tip 22, the main body 21 is in the form of being attached to the inner wall of the transition cavity 13 and axially reciprocating. The needle tip 22 is arranged at one end of the main body 21 close to the valve seat, and is used to extend into the valve seat cavity 103 to separate the valve seat cavity 103 from the valve cavity 102 during axial reciprocating movement, or to exit the valve seat cavity 103 to communicate the valve seat cavity 103 with the valve cavity 102. According to the position of the needle tip 22, the expansion valve can be divided into Figure 2 The closed state shown or Figure 3 The open state shown in Figure 2 In the closed state shown, the needle tip 22 is stuck at the entrance of the valve seat cavity 103 and the valve cavity 102, so that the cooling medium in the valve cavity 102 cannot enter the valve seat cavity 103. Figure 3 In the open state shown, the needle tip portion 22 does not contact the connection between the valve seat cavity 103 and the valve cavity 102 , and the cooling medium in the valve cavity 102 can flow smoothly into the valve seat cavity 103 .

[0051] Here, the needle tip 22 may be a gradually contracting structure that decreases from one end close to the main body 21 to the other end, so that the expansion valve can have a variety of openings. In this way, as the needle tip 22 gradually extends into the valve seat cavity 103, the gap between the valve seat cavity 103 and the valve cavity 102 gradually decreases, so that the path for the cooling medium to pass through becomes narrower, so that the opening of the expansion valve can be gradually reduced, and the needle tip 22 gradually moves out of the valve seat cavity 103, and the gap between the valve seat cavity 103 and the valve cavity 102 gradually increases, so that the path for the cooling medium to pass through becomes wider, so that the opening of the expansion valve can be gradually increased.

[0052] Furthermore, if Figures 2 to 5 As shown, an end of the main body 21 away from the needle tip 22 may be formed with an opening to form a valve needle cavity 201, and the valve needle 2 may be provided with a second flow guide 202 extending from the main body 21 to the needle tip 22, and the valve needle cavity 201, the second flow guide 202 and the valve cavity 102 are connected in sequence. To further balance the pressure between the valve needle cavity 201 and the valve cavity 102, thereby shortening the response time of the valve needle 2 and improving the sensitivity of the valve needle 2. Among them, the main body 21 can also be constructed as a columnar main body, eliminating the flat position on both sides of the main body 21, reducing the resistance generated by the valve needle 2 during the rotation process, reducing the driving voltage, facilitating the processing of the valve needle 2, improving the roughness problem of the valve needle 2 caused by the flat position on both sides of the main body 21, and avoiding the occurrence of burrs and burrs on the matching surface of the valve needle 2 and the transition cavity 13, so that the positioning height of the valve needle 2 can be higher and more reliable, improving the sensitivity of the valve needle 2 response, and shortening the response time.

[0053] According to one embodiment of the present disclosure, Figure 2and Figure 3 As shown, the expansion valve may further include a push rod 4 for pushing the valve needle 2 in the axial direction, a valve core 16 sleeved on the outside of the push rod 4 and fixed in the valve body cavity 101, and a driving assembly for providing a driving force for the push rod 4 to rotate around the axis, wherein the push rod 4 may be threadedly matched with the valve core 16. The threads may be respectively provided on the inner wall of the valve core 16 and on the push rod 4. During assembly, the push rod 4 may be first assembled into the valve body 1, and then the valve core 16 may be fixed on the valve body 1, and finally the magnetic rotor 32 mentioned below may be connected to the push rod 4, wherein the valve core 16 and the valve body 1 may be riveted or welded, and the present disclosure does not limit this.

[0054] Furthermore, if Figures 1 to 5 As shown, the drive assembly may also include a magnetic rotor 32 that can be driven to rotate by an energized coil 31, one end of the push rod 4 is fixedly connected to the magnetic rotor 32, and the other end is used to push the valve needle 2 in the axial direction. The coil 31 may be arranged on the outside of the magnetic rotor 32, and can drive the magnetic rotor 32 to rotate. Here, a rotor insert 321 may be fixed on the magnetic rotor 32, and the end of the push rod 4 away from the valve needle 2 may be fixedly arranged in the rotor insert 321. The push rod 4 and the rotor insert 321 may be welded and fixed, and the present disclosure does not limit this. In this way, one end of the push rod 4 can be fixedly connected to the magnetic rotor 32, so that the push rod 4 can rotate and reciprocate along the valve body 1, and the main body 21 is fixedly connected to the end of the push rod 4 away from the magnetic rotor 32. During operation, the coil 31 can be energized, the coil 31 drives the magnetic rotor 32 to rotate, and the magnetic rotor 32 drives the push rod 4 to rotate. The push rod 4 can realize axial movement along the inner wall of the valve body 1 while rotating through the thread matching with the valve body 1, thereby driving the reciprocating motion of the valve needle 2 to achieve the connection or isolation between the valve cavity 102 and the valve seat cavity 103.

[0055] In addition, if Figures 1 to 3 As shown, the expansion valve may further include a cover 7, which is disposed on the valve body 1 and encloses a receiving cavity with the valve body 1, and the push rod 4, the valve core 16 and the magnetic rotor 32 may be at least partially disposed in the receiving cavity. The cover 7 may be located between the coil 31 and the magnetic rotor 32, and one end of the cover 7 may be fixedly connected to the valve body 1. The function of the cover 7 is to prevent dust from entering the various cavities of the expansion valve and affecting the movement of the components. The cover 7 may be made of magnetic isolation material, so that when the coil 31 is energized to drive the magnetic rotor 32 to rotate, it will not affect the magnetic rotor 32.

[0056] Furthermore, if Figures 2 to 4As shown, the expansion valve may include a pressure ring 61 and an elastic member 62. The pressure ring 61 is fixed at the open end of the valve needle chamber 201. The push rod 4 can extend into the valve needle chamber 201 from the open end and a radially protruding limit protrusion 41 is formed inside the valve needle chamber 201. The limit protrusion 41 is axially limited by the pressure ring 61. The elastic member 62 can elastically press against the limit protrusion 41 and the bottom of the valve needle chamber 201 along the axial direction to prevent the push rod 4 from moving in the valve needle chamber 201 and affecting the sealing of the valve needle 2.

[0057] Furthermore, if Figures 2 to 4 As shown, the valve needle 2 also includes a T-shaped piece 63 disposed in the valve needle cavity 201. The transverse end of the T-shaped piece 63 can be pressed against the bottom of the valve needle cavity 201. The elastic piece 62 can be a compression spring, a spring, or an elastic rubber, which is not limited in the present disclosure. One end of the compression spring can be sleeved on the push rod 4, and the other end can be sleeved on the outside of the longitudinal end of the T-shaped piece 63. The compression spring elastically presses between the limiting protrusion 41 and the transverse end of the T-shaped piece 63. It is used to provide a force to press the limiting protrusion 41 toward the opening. The cooperation between the pressure ring 61, the elastic piece 62 and the limiting protrusion 41 can enable the push rod 4 to move while driving the valve needle 2 to move. At the same time, the pressing force of the elastic piece 62 can also enable the valve needle 2 to move. Figure 2 In the closed state shown, it can abut against the valve seat 14, thereby ensuring the separation of the valve cavity 102 and the valve seat cavity 103, and ensuring the sealing of the expansion valve. The T-shaped piece 63 can guide the elastic piece 62, reduce the deformation of the side of the elastic piece 62 close to the needle tip 22 when the valve needle 2 rotates and moves axially, and also reduce the possibility of the elastic piece 62 rotating relative to the main body 21, thereby reducing the rotational friction inside the valve needle 2, so as to achieve the low driving voltage, low energy consumption, and high sensitivity requirements of the expansion valve. The T-shaped piece 63 can be made of polytetrafluoroethylene or other acid-, alkali-, and oxidation-resistant materials, which is not limited in the present disclosure. In addition, when the horizontal end of the T-shaped piece 63 is attached to the inner wall of the valve needle cavity, in order to connect the valve needle cavity 201 with the valve cavity 102, the T-shaped piece 63 may also be provided with a channel so that the second guide channel 202 can be connected to the channel on the T-shaped piece 63, so that the valve needle cavity 201 is connected to the valve cavity 102, so as to further balance the pressure between the valve needle cavity 201 and the valve cavity 102, thereby shortening the response time of the valve needle 2 and improving the sensitivity of the valve needle 2.

[0058] Furthermore, if Figure 2 and Figure 3 As shown, the magnetic rotor can be sleeved on the outside of the valve core 16, and the expansion valve also includes a stopper 5 fixedly connected to the inner wall of the magnetic rotor 32, and a radially protruding stopper 12 is provided at one end of the valve core 16 away from the valve needle 2, and the stopper 12 is used to limit the displacement of the stopper 5 away from the valve needle 2. The contact between the stopper 5 and the stopper 12 can limit the movement position of the push rod 4 in the axial direction.

[0059] Specifically, Figures 1 to 3 As shown, the limiter 5 can be a coil spring sleeved on the outside of the valve core 16, and the outer peripheral surface of the valve core 16 can also be formed with a spiral channel matching the coil spring. The coil spring is arranged in the spiral channel to enhance the stability of the movement of the limiter spring. In this way, the coil spring can extend one end of the long strip to connect with the magnetic rotor 32, and the other end of the spiral can be reciprocatingly sleeved on the outer wall of the valve body 1. Since the end of the valve core 16 away from the valve needle 2 is provided with a stopper 12, the reciprocating movement distance of the limiter 5 relative to the valve body 1 can be limited. When the magnetic rotor 32 rotates, since the limit member 5 is connected to the magnetic rotor 32, the limit member 5 can also rotate relative to the outer wall of the valve body 1. Since the push rod 4 is threadedly matched with the inner wall of the valve body 1, the push rod 4 can also move axially relative to the valve body 1 while rotating. Therefore, the limit member 5 is also equivalent to the axial movement of the outer wall of the valve body 1 while rotating. After the limit member 5 moves axially a certain distance, it contacts the stop platform 12. At this time, the limit member 5 contacts the stop platform 12, making it impossible for the limit member 5 to continue axially moving in the direction away from the valve seat 14. The limit member 5 and the push rod 4 are both fixedly connected to the magnetic rotor 32. Therefore, the push rod 4 cannot continue axially moving in the direction away from the valve seat 14, thereby achieving the purpose of limiting the formation of the expansion valve.

[0060] According to one embodiment of the present disclosure, Figures 2 to 5 As shown, the bottom wall of the valve cavity 102 is connected to the top wall of the valve seat cavity 103, and a first through hole 1021 for connecting the valve cavity 102 to the outside is opened on the peripheral wall of the valve cavity 102, and a second through hole 1031 for connecting the valve seat cavity 103 to the outside can be opened on the valve seat cavity 103, and the cooling medium enters the valve cavity 102 from the first through hole 1021. At this time, part of the cooling medium can flow into the valve body cavity 101 through the first guide channel 11 and the second guide channel 202 to balance the pressure of the valve body cavity 101 and the valve cavity 102, and the valve needle 2 moves away from the valve seat 14 to connect the valve cavity 102 with the valve seat cavity 103. Another part of the cooling medium enters the valve seat cavity 103 through the through hole at the connection between the valve body 1 and the valve seat 14, and then flows out of the expansion valve through the second through hole 1031.

[0061] Furthermore, if Figures 1 to 5As shown, the outer periphery of the valve body 1 and the outer periphery of the valve seat 14 can be respectively sleeved with a sealing ring 15. Here, the outside of the valve body 1 can be used to connect with the integrated component, and the gap between the valve body 1 and the integrated component can be connected with the valve cavity 102 and the valve seat cavity 103. The expansion valve also includes two sealing rings 15 for contacting with the integrated component. The two sealing rings 15 are respectively arranged on the outside of the valve body 1 and the valve seat 14, and the through hole of the side wall of the valve cavity 102 is located between the two sealing rings 15, so that the two sealing rings 15 can not only separate the valve cavity 102 and the valve seat cavity 103, but also prevent the cooling medium from leaking from the through hole of the side wall of the valve cavity 102 and directly flowing to the through hole where the valve seat cavity 103 is connected to the outside or where the coil 31 is located, thereby affecting the sealing effect of the expansion valve and preventing the expansion valve from malfunctioning.

[0062] On the basis of the above scheme, the present disclosure further provides a heat pump management system, which includes the above expansion valve, and the heat pump management system has all the beneficial effects of the above expansion valve, which will not be repeated here.

[0063] On the basis of the above scheme, the present disclosure also provides a vehicle, which includes the above heat pump management system, and the vehicle has all the beneficial effects of the above heat pump management system, which will not be repeated here.

[0064] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0065] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0066] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An expansion valve, characterized in that: include: The valve body is constructed in a hollow shaft shape and is provided with a valve body cavity, a transition cavity and a valve cavity in sequence in the axial direction; and The valve needle can be axially reciprocated in the valve body and fits against the inner wall of the transition chamber. Wherein, an inner wall of the transition cavity is provided with an axially penetrating first flow guide channel, and the first flow guide channel connects the valve body cavity with the valve cavity.

2. The expansion valve according to claim 1, characterized in that: The first flow guide channel is a flow guide groove, which extends axially and has a notch facing the valve needle.

3. The expansion valve according to claim 2, characterized in that: The number of the guide grooves is two, and the two guide grooves are arranged opposite to each other.

4. The expansion valve according to any one of claims 1 to 3, characterized in that: The expansion valve comprises a valve seat installed at one end of the valve body close to the valve cavity, wherein the valve seat has a valve seat cavity capable of communicating with the valve cavity. The valve needle comprises: The main body part moves axially back and forth in a form of being in close contact with the inner wall of the transition chamber; and The needle tip is arranged at one end of the main body close to the valve seat, and is used to extend into the valve seat cavity to separate the valve seat cavity from the valve cavity during axial reciprocating motion, or to withdraw from the valve seat cavity to connect the valve seat cavity with the valve cavity.

5. The expansion valve according to claim 4, characterized in that: An opening is formed at one end of the main body away from the needle tip to form a valve needle cavity. The valve needle is provided with a second flow guide channel extending from the main body to the needle tip, and the valve needle cavity, the second flow guide channel and the valve cavity are connected in sequence.

6. The expansion valve according to claim 5, characterized in that: The expansion valve comprises: A pressure ring is fixed to the opening end of the valve needle cavity, A push rod, used to push the valve needle in the axial direction, the push rod extends from the open end into the valve needle cavity and is provided with a radially protruding limiting protrusion inside the valve needle cavity, the limiting protrusion being axially limited by the pressure ring; and The elastic member elastically presses against the limiting protrusion and the bottom of the valve needle cavity in the axial direction.

7. The expansion valve according to claim 6, characterized in that The expansion valve further comprises a T-shaped piece arranged in the valve needle cavity, wherein the transverse end of the T-shaped piece abuts against the bottom of the valve needle cavity. The elastic member is a compression spring, one end of which is sleeved on the push rod, and the other end is sleeved on the outer side of the longitudinal end of the T-shaped member. The compression spring elastically presses between the limiting protrusion and the transverse end of the T-shaped member.

8. The expansion valve according to claim 4, characterized in that: The needle tip portion is a gradually contracting structure that decreases from one end close to the main body portion to the other end.

9. The expansion valve according to claim 4, characterized in that: A first through hole for connecting the valve cavity to the outside is formed on the peripheral wall of the valve cavity.

10. The expansion valve according to claim 4, characterized in that The outer periphery of the valve body and the outer periphery of the valve seat are respectively sleeved with sealing rings.

11. The expansion valve according to claim 1, characterized in that The expansion valve further comprises: A push rod, used to push the valve needle in the axial direction; A valve core is sleeved on the outside of the push rod and fixed in the valve body cavity, wherein the push rod is threadably matched with the valve core; and The driving assembly is used to provide the push rod with a driving force for rotating around an axis.

12. The expansion valve according to claim 11, characterized in that The driving assembly comprises a magnetic rotor which can be driven to rotate by an energized coil. One end of the push rod is fixedly connected to the magnetic rotor, and the other end is used to push the valve needle in the axial direction.

13. The expansion valve according to claim 12, characterized in that The magnetic rotor is sleeved on the outside of the valve core, and the expansion valve also includes a limit member fixedly connected to the inner wall of the magnetic rotor. A radially protruding stop platform is provided at the end of the valve core away from the valve needle, and the stop platform is used to limit the displacement of the limit member away from the valve needle.

14. The expansion valve according to claim 13, characterized in that The limiting member is a coil spring sleeved on the outside of the valve core, and the outer peripheral surface of the valve core is formed with a spiral channel matching the spiral direction of the coil spring.

15. The expansion valve according to claim 12, characterized in that The expansion valve further comprises a cover body, which is disposed on the valve body and encloses a receiving cavity with the valve body. The push rod, the valve core and the magnetic rotor are at least partially disposed in the receiving cavity.

16. A heat pump management system, characterized in that: The invention comprises the expansion valve according to any one of claims 1 to 15.

17. A vehicle, characterized in that: The invention comprises the heat pump management system as claimed in claim 16.

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