Expansion valve, heat pump and vehicle

Abstract

The application relates to an expansion valve, a heat pump and a vehicle. The expansion valve comprises a valve body assembly which is formed with an internal space, a first channel and a second channel, the first channel being communicated with the internal space; a guide sleeve which is movably arranged in the internal space and is formed with a communicated first cavity and a second cavity, the guide sleeve being guidedly matched with the valve body assembly along a moving direction; a plug which comprises a first limiting part and an adjusting part, the first limiting part being movably arranged in the first cavity, and the adjusting part extending out of the second cavity; a screw rod which is threadedly matched with the valve body assembly, the screw rod being connected with the guide sleeve, so that the screw rod can rotate along an axial direction of the screw rod and drive the guide sleeve to move relative to the valve body assembly along the axial direction of the screw rod; and an elastic piece which is at least partially arranged in the second cavity and pushes the plug. The expansion valve is provided with the screw rod which is connected with the guide sleeve, so that the rotation of the screw rod can be transmitted to the plug, the flow control can be realized, the influence of the thread matching of the screw rod on the position of the plug is reduced, and the sealing performance of the expansion valve is improved.

Description

Technical Field

[0001] This application relates to the field of expansion valves, and more particularly to an expansion valve, a heat pump including the expansion valve, and a vehicle including the heat pump. Background Technology

[0002] Expansion valves typically have a connected screw and a plug. The screw is threaded to the valve body, allowing it to slide relative to the valve body while rotating. This, in turn, causes the plug to slide, thus enabling the plug to seal or open the valve port.

[0003] However, in the existing technology, due to the influence of the threaded connection, the plug will generate radial displacement during the sliding process. This radial displacement affects the sealing effect of the plug on the valve port, thereby affecting the sealing performance of the expansion valve. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide an expansion valve with improved sealing performance, a heat pump including the expansion valve, and a vehicle including the heat pump. Specifically, the technical solutions include the following:

[0005] In a first aspect, embodiments of this application provide an expansion valve, comprising:

[0006] The valve body assembly has an internal space, a first channel, and a second channel, with the first channel communicating with the internal space.

[0007] The guide sleeve is movably disposed within the internal space, forming a first cavity and a second cavity that are connected. The guide sleeve guides and engages with the inner wall of the valve body assembly along the direction of movement.

[0008] The plug includes a first limiting part and an adjusting part that are fixedly connected. The first limiting part is movably disposed in the first cavity, and the adjusting part extends out of the second cavity, so that the plug can move with the guide sleeve.

[0009] The screw is threaded into the valve body assembly and connected to the guide sleeve, allowing the screw to rotate along the screw axis and drive the guide sleeve to move relative to the valve body assembly along the screw axis, thereby driving the regulating part to regulate the fluid flow between the second channel and the internal space.

[0010] The elastic element is at least partially disposed within the second cavity and pushes against the plug in a direction away from the screw.

[0011] This application's expansion valve utilizes a guide sleeve that guides and engages with the inner wall of the valve body assembly. A screw is connected to the guide sleeve, allowing axial rotation of the screw to move the guide sleeve relative to the valve body assembly along the screw's axis. The interaction between the guide sleeve and the elastic element moves the adjusting part of the plug, thereby regulating the fluid flow between the second channel and the internal space of the valve body assembly, achieving plug-based control of fluid flow. Simultaneously, the guiding engagement between the guide sleeve and the valve body assembly reduces the impact of the screw's threaded engagement on the plug's position, thus improving the sealing performance of this expansion valve.

[0012] In one embodiment, the guide sleeve is provided with a second limiting part, which is located between the first cavity and the second cavity, and the first limiting part is movably disposed between the screw and the second limiting part.

[0013] In one embodiment, the first limiting portion includes a curved surface structure for abutting against the second limiting portion; and / or the second limiting portion is conical, with its diameter gradually increasing toward the adjusting portion.

[0014] In one embodiment, the elastic member has opposite first and second ends, the first end abutting against the second limiting portion and the second end abutting against the plug.

[0015] In one embodiment, the plug has an abutment portion located between the first limiting portion and the adjusting portion, and the second end abuts against the abutment portion.

[0016] In one embodiment, the abutment portion is guided and engaged with the inner wall of the guide sleeve along the movement direction of the plug, and the movement direction of the plug is parallel to the axial direction of the screw.

[0017] In one embodiment, the expansion valve further includes an annular gasket surrounding the periphery of the plug and located between the second end and the abutment portion.

[0018] In one embodiment, the annular gasket is a lubricating plastic gasket.

[0019] In one embodiment, the guide length between the guide sleeve and the inner wall of the valve body assembly is L, and the minimum distance between the guide sleeve and the valve body assembly is D, where L / D≥100.

[0020] In one embodiment, the screw is at least partially housed within the first cavity.

[0021] In one embodiment, the screw is fixedly connected to the guide sleeve.

[0022] In one embodiment, the screw is movably connected to the guide sleeve.

[0023] In one embodiment, the screw includes a fixedly connected body and a third limiting part, the body being threadedly engaged with the valve body assembly, and the third limiting part being movably disposed within the first cavity.

[0024] In one embodiment, a limiting structure is provided at the end of the guide sleeve near the body, and a third limiting part extends into the first cavity through the limiting structure. The limiting structure is used to prevent the third limiting part from coming out of the guide sleeve in a direction away from the plug.

[0025] In one embodiment, the valve body includes a valve body body and a valve core. The valve body body has a through hole, and a first channel and a second channel are provided on the valve body body and are respectively connected to the through hole. The valve core has a threaded hole, and part of the valve core extends into the through hole and is fixed to the hole wall of the through hole to form an internal space. A screw extends into the threaded hole and is threadedly engaged with the valve core.

[0026] In one embodiment, the expansion valve further includes a magnetic rotor fixed to the outer edge of the valve core, and the end of the screw away from the plug passes through a threaded hole and is drively connected to the magnetic rotor, which is used to drive the screw to rotate.

[0027] Secondly, embodiments of this application provide a heat pump, including a first pipe, a second pipe, and an expansion valve. The first channel of the expansion valve is connected to the first pipe, and the second channel of the expansion valve is connected to the second pipe. The expansion valve is used to control the flow rate of fluid flowing between the first pipe and the second pipe.

[0028] Thirdly, embodiments of this application provide a vehicle, including a body and a heat pump, the heat pump being housed within the body.

[0029] It is understandable that the heat pump provided in the second aspect of this application and the vehicle provided in the third aspect both have the effect of improving sealing performance because they adopt the expansion valve provided in the first aspect of this application. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the expansion valve provided in one embodiment of this application;

[0031] Figure 2 This is an exploded view of an expansion valve provided in one embodiment of this application;

[0032] Figure 3 This is a partial structural schematic diagram of the expansion valve provided in one embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the structure of the guide sleeve provided in one embodiment of this application;

[0034] Figure 5 This is a cross-sectional structural diagram of the guide sleeve provided in one embodiment of this application;

[0035] Figure 6 This is a schematic diagram of the valve body body provided in one embodiment of this application;

[0036] Figure 7 This is a schematic diagram of the valve core provided in one embodiment of this application;

[0037] Figure 8 This is another structural schematic diagram of the expansion valve provided in one embodiment of this application. Detailed Implementation

[0038] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0039] The following descriptions of the embodiments are based on the accompanying illustrations and are used to illustrate specific embodiments in which this application can be implemented. The component designations used herein, such as "first," "second," etc., are merely for distinguishing the described objects and do not have any sequential or technical meaning. Unless otherwise specified, the terms "connection" and "linkage" used in this application include both direct and indirect connections (linkages). Directional terms used in this application, such as "up," "down," "front," "rear," "left," "right," "inner," "outer," "side," etc., are merely for reference to the accompanying drawings. Therefore, the use of directional terms is for better and clearer explanation and understanding of this application, and does not indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this application.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising," "may include," "include," or "may include" used in this application indicate the presence of the corresponding disclosed function, operation, element, etc., and do not limit one or more other functions, operations, elements, etc. Moreover, the terms "comprising" or "include" indicate the presence of the corresponding features, number, steps, operations, elements, components, or combinations thereof disclosed in the specification, but do not exclude the presence or addition of one or more other features, number, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusion.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0042] This application provides a vehicle including a body and a heat pump, wherein the heat pump is housed within the body, and the body serves to protect the heat pump. The heat pump includes an evaporator, a condenser, a compressor, a first pipe, a second pipe, and an expansion valve. One end of the evaporator is connected to a first channel of the expansion valve via the first pipe, and the other end of the evaporator is connected to the compressor. One end of the condenser is connected to a second channel of the expansion valve via the second pipe, and the other end of the condenser is connected to the compressor.

[0043] The condenser is located outside the carriage to absorb heat from the outside air. The evaporator is located inside the carriage to release heat into the carriage. Specifically, the condenser sends the gas that has absorbed external heat to the compressor, where it is compressed into high-pressure gas and sent to the evaporator. The evaporator releases heat into the carriage and liquefies the gas, flowing into the first pipe. From there, it flows through the expansion valve into the second pipe and back into the condenser. The expansion valve controls the flow rate of the fluid between the first and second pipes.

[0044] It is understood that in other embodiments, the expansion valve of this application can also be applied to other places, and this application does not impose any special limitations on this.

[0045] Please see Figure 1The diagram shown is a structural schematic of the expansion valve 100 provided in one embodiment of this application, and please refer to [the following text is also included]. Figure 2 The diagram shown is an exploded view of the expansion valve 100 provided in one embodiment of this application. For ease of description, Figure 2 The structure of part of the expansion valve 100 is omitted.

[0046] like Figure 1 and Figure 2 As shown, the expansion valve 100 of this application includes a valve body assembly 10 and a valve seat 20. The valve body assembly 10 includes a valve body main body 11 and a valve core 12. The valve body main body 11 has a second channel 1112, a first channel 1111, and a through hole 112. The valve seat 20 is embedded in the first channel 1111 and has a valve port 21. The second channel 1112 communicates with the valve port 21 through the through hole 112.

[0047] The valve core 12 has a threaded hole 1211 inside. One end of the valve core 12 can extend into the through hole 112 and be fixed to the hole wall of the through hole 112, thereby forming the internal space 10a of the valve body assembly 10.

[0048] Specifically, the expansion valve 100 of this application has a first channel 1111 connected to an external first pipe, and a second channel 1112 connected to an external second pipe through a valve port 21. The first channel 1111 is connected to the internal space 10a, allowing fluid in the first pipe to enter the internal space 10a via the first channel 1111, and then flow sequentially through the second channel 1112 and the valve port 21 to the second pipe, thereby realizing the opening function of the expansion valve 100 of this application.

[0049] like Figure 1 and Figure 2 As shown, the expansion valve 100 of this application also includes a guide sleeve 30, a screw 40, and a plug 50. The guide sleeve 30, screw 40, and plug 50 are housed within the internal space 10a of the valve body assembly 10, and the plug 50 can extend out of the valve body assembly 10 toward the valve port 21. The guide sleeve 30 is movably disposed in the internal space 10a and forms a communicating first cavity 30a and a second cavity 30b. Along the axial direction of the screw 40, the second cavity 30b is displaced between the first cavity 30a and the valve port 21, and the guide sleeve 30 guides and engages with the inner wall of the valve body assembly 10 along its own direction of movement.

[0050] The screw 40 is located on the side of the plug 50 away from the valve port 21. One end of the screw 40 away from the plug 50 extends into the threaded hole 1211 inside the valve core 12 to engage with the valve core 12 threadedly, and the other end is connected to the guide sleeve 30. This allows the screw 40 to rotate along its axial direction while simultaneously sliding relative to the valve body assembly 10 through the threaded hole 1211, thereby causing the guide sleeve 30 to rotate and slide relative to the valve body assembly 10 along the axial direction of the screw 40.

[0051] When the screw 40 rotates and slides, the screw 40 may experience radial wobble at its end towards the valve port 21 due to the fit between the screw 40 and the threaded hole 1211. The guiding fit between the guide sleeve 30 and the wall of the through hole 112 in the valve body 11 ensures that the guide sleeve 30 can move relative to the valve body assembly 10 while limiting the distance between the outer wall of the guide sleeve 30 and the wall of the through hole 112.

[0052] Therefore, the guiding fit between the guide sleeve 30 and the through hole 112 can reduce the impact of the radial wobble generated by the screw 40 relative to the valve body assembly 10 on the guide sleeve 30, thereby limiting the radial wobble of the guide sleeve 30 and limiting the radial relative positional relationship between the guide sleeve 30 and the valve port 21.

[0053] like Figure 1 and Figure 2 As shown, the plug 50 includes an adjusting part 51 and a first limiting part 52 that are fixedly connected. The first limiting part 52 is movably disposed in the first cavity 30a, and the adjusting part 51 is disposed on the side of the first limiting part 52 facing the valve port 21 and extends out of the second cavity 30b.

[0054] The expansion valve 100 of this application also includes an elastic element 61, which is at least partially disposed within the second cavity 30b and acts on the plug 50, causing the plug 50 to tend to move away from the screw 40. A first limiting portion 52 based on the plug 50 is movably disposed within the first cavity 30a. It is understood that the provision of the elastic element 61 causes the first limiting portion 52 to tend to move away from the first cavity 30a, thereby creating a mutual force between the first limiting portion 52 and the guide sleeve 30.

[0055] When the guide sleeve 30 moves relative to the valve body assembly 10, the relative movement of the guide sleeve 30 can be transmitted to the first limiting part 52 due to the action of the elastic element 61, and then transmitted to the adjusting part 51 through the first limiting part 52, so that the plug 50 can slide relative to the valve body assembly 10 as the guide sleeve 30 moves.

[0056] Specifically, when the screw 40 rotates along its own axis and drives the guide sleeve 30 to move, the guide sleeve 30 can drive the adjusting part 51 to move relative to the valve body assembly 10 through the elastic element 61. When the adjusting part 51 extends into the valve port 21, the plug 50 can seal the valve port 21, thereby preventing external fluid from flowing out through the internal space 10a from the second channel 1112 and the valve port 21 in sequence, thus realizing the valve closing function of the expansion valve 100 of this application.

[0057] When the regulating part 51 slides away from the valve port 21 and opens the valve port 21, the external fluid can flow out from the internal space 10a through the second channel 1112 and the valve port 21 in sequence, thereby realizing the opening function of the expansion valve 100 of this application.

[0058] Therefore, compared to the prior art where the plug is directly placed at the end of the screw facing the valve port, allowing the screw to control the plug to cover or open the valve port, the expansion valve 100 of this application provides a guide sleeve 30 that guides and cooperates with the inner wall of the valve body assembly 10, and connects the screw 40 to the guide sleeve 30. This allows the axial rotation of the screw 40 to be transmitted to the plug 50 through the guide sleeve 30 and the elastic element 61, and drives the adjusting part 51 of the plug 50 to extend into or out of the valve port 21 relative to the valve body assembly 10, thereby regulating the fluid flow between the second channel 1112 and the internal space 10a of the valve body assembly 10.

[0059] Meanwhile, by utilizing the guiding fit between the guide sleeve 30 and the inner wall of the valve body assembly 10, the radial wobble caused by the threaded engagement of the screw 40 is reduced, thus reducing the impact on the radial position of the plug 50. This prevents the radial position from affecting the shielding effect of the adjusting part 51 on the valve port 21. Consequently, the sealing performance of the expansion valve 100 of this application is improved.

[0060] Please see Figure 3 The diagram shown is a partial structural schematic of the expansion valve 100 provided in one embodiment of this application. See also: Figure 1 and Figure 2 .

[0061] like Figures 1-3 As shown, the inner wall of the guide sleeve 30 is provided with a second limiting part 31, which is located between the first cavity 30a and the second cavity 30b and extends toward the side wall of the plug 50. A first limiting part 52 is disposed between the second limiting part 31 and the screw 40. It can be understood that the provision of the second limiting part 31 limits the relative position of the second limiting part 31, thereby limiting the relative position of the plug 50. It can be understood that when the screw 40 drives the guide sleeve 30 to slide away from the valve port 21, the second limiting part 31 of the guide sleeve 30 can abut against the first limiting part 52 of the plug 50, and drive the plug 50 to slide away from the valve port 21, thereby realizing the valve opening function of the expansion valve 100 of this application.

[0062] When the screw 40 drives the guide sleeve 30 to slide toward the valve port 21, the second limiting part 31 of the guide sleeve 30 can resist the first limiting part 52 under the action of the elastic member 61, so that the force of the screw 40 driving the guide sleeve 30 can be transmitted to the plug 50, and the plug 50 slides toward the valve port 21, thereby realizing the valve closing function of the expansion valve 100 of this application.

[0063] In one embodiment, such as Figure 3 As shown, the first limiting part 52 has a curved surface structure. The curved surface structure is used to contact the surface of the second limiting part 31 away from the valve port 21. Since the guide sleeve 30 also rotates with the screw 40 during the relative sliding process, the torque of this rotation is transmitted to the first limiting part 52 through the friction between the surfaces of the second limiting part 31 and the first limiting part 52, thereby driving the plug 50 to rotate.

[0064] Understandably, providing a curved surface structure on the first limiting part 52 can reduce the contact area between the plug 50 and the second limiting part 31, thereby reducing the friction between the second limiting part 31 and the plug 50, reducing the torque transmitted from the second limiting part 31 to the plug 50, and further reducing the rotation of the plug 50 relative to the valve body assembly 10, and reducing the friction between the plug 50 and the side wall of the valve port 21 while covering the valve port 21. This further improves the sealing performance of the expansion valve 100 of this application.

[0065] In one embodiment, such as Figure 3 As shown, the first limiting portion 52 can be configured as a sphere. It is understood that in other embodiments, the first limiting portion 52 can also be configured as other shapes with curved surfaces, and this application does not particularly limit this.

[0066] Please see Figure 4 The diagram shown is a structural schematic of the guide sleeve 30 provided in one embodiment of this application, and please refer to [the following text is also included]. Figure 5 The diagram shown is a cross-sectional view of the guide sleeve 30 provided in one embodiment of this application. See also: Figure 3 .

[0067] In one embodiment, such as Figures 3-5 As shown, the second limiting portion 31 is conical and surrounds the inner wall of the guide sleeve 30 to form a first opening 311 and a second opening 312. The first opening 311 is farther from the valve port 21 than the second opening 312, and the diameter of the first opening 311 is larger than the diameter of the second opening 312. This results in the abutment surface 313 of the second limiting portion 31, which contacts the first limiting portion 52, being an inclined surface.

[0068] Understandably, by setting the abutment surface 313 as an inclined surface, the contact area between the plug 50 and the abutment surface 313 can be reduced, thereby reducing the friction between the second limiting part 31 and the plug 50, reducing the torque transmitted from the second limiting part 31 to the plug 50, and further reducing the rotation of the plug 50 relative to the valve body assembly 10, and reducing the friction between the plug 50 and the side wall of the valve port 21 while covering the valve port 21. This further improves the sealing performance of the expansion valve 100 of this application.

[0069] In another embodiment, the diameters of the first opening 311 and the second opening 312 of the second limiting portion 31 may be equal, and the corresponding abutting surface 313 is the surface of the second limiting portion 31 away from the valve port 21, that is, the abutting surface 313 is a plane. In other embodiments, the abutting surface 313 may also be a curved surface to further reduce the contact area between the first limiting portion 52 and the second limiting portion 31. This application does not impose any particular limitation on this.

[0070] In one embodiment, such as Figures 1-3 As shown, the elastic member 61 has a first end 611 and a second end 612, which are opposite to each other. The first end 611 abuts against the second limiting part 31, and the second end 612 abuts against the plug 50. This is to make the adjusting part 51 of the plug 50 tend to move away from the guide sleeve 30.

[0071] In one embodiment, such as Figures 1-3 As shown, the first limiting part 52 and the adjusting part 51 of the plug 50 are provided with an abutting part 53 and a connecting part 54 that are fixedly connected. The abutting part 53 is located between the connecting part 54 and the adjusting part 51.

[0072] The abutment portion 53 is guided and engaged with the inner wall of the guide sleeve 30 along the movement direction of the plug 50. The movement direction of the plug 50 is parallel to the axial direction of the screw 40.

[0073] As the screw 40 moves along its own axis, radial wobble occurs. Understandably, the guiding engagement between the abutment portion 53 and the inner wall of the guide sleeve 30, along with the guiding engagement between the guide sleeve 30 and the inner wall of the valve body assembly 10, further restricts the radial wobble of the plug 50. This further prevents the plug 50 from being squeezed against the valve port 21 due to radial wobble during the sliding process of the plug 50. This further improves the sealing performance of the expansion valve 100 of this application.

[0074] Simultaneously, the abutting part 53 also abuts against the second end 612. That is, when the guide sleeve 30 slides relative to the valve body assembly 10 under the action of the screw 40, the guide sleeve 30 can deform the elastic member 61 through the abutting relationship between the second limiting part 31 and the first end 611. The deformation of the elastic member 61 is transmitted to the plug 50 through the abutting relationship between the second end 612 and the abutting part 53. Thus, the synchronous movement of the guide sleeve 30 and the plug 50 is achieved.

[0075] Specifically, such as Figures 1-3As shown, when the expansion valve 100 switches from the open state to the closed state, the screw 40 rotates in the first direction and slides relative to the valve body assembly 10 toward the valve port 21, engaging with the threaded hole 1211. Simultaneously, the screw 40 moves along its own axis, causing the guide sleeve 30 to also move relative to the valve body assembly 10. At this time, the elastic force inside the elastic member 61 causes the adjusting part 51 and the second limiting part 31 to abut against each other, and the guide sleeve 30 slides relative to the valve body assembly 10 toward the valve port 21, thereby further compressing the elastic member 61.

[0076] The elastic element 61 releases the force transmitted from the guide sleeve 30 to the abutment portion 53, pushing the plug 50 to slide toward the valve port 21, and causing the adjusting portion 51 to continue to abut against the second limiting portion 31. When the plug 50 contacts the valve port 21, the screw 40 continues to rotate, thereby causing the guide sleeve 30 to further compress the elastic element 61, and thus causing the plug 50 to further cover the valve port 21, further improving the sealing performance of the expansion valve 100 of this application.

[0077] When the expansion valve 100 changes from the closed state to the open state, the screw 40 rotates in a second direction opposite to the first direction and slides relative to the valve body assembly 10 away from the valve port 21, engaging with the threaded hole 1211. Simultaneously, the movement of the screw 40 relative to the valve body assembly 10 causes the guide sleeve 30 to also move relative to the valve body assembly 10. At this time, the deformation of the elastic element 61 decreases until the second limiting portion 31 of the guide sleeve 30 abuts against the first limiting portion 52.

[0078] Then, the elastic force within the elastic element 61 maintains the abutting relationship between the first limiting part 52 and the second limiting part 31. The guide sleeve 30 directly pulls the first limiting part 52 away from the valve port 21 via the second limiting part 31 until the plug 50 opens the valve port 21. This realizes the valve opening function of the expansion valve 100 of this application.

[0079] In one embodiment, such as Figures 1-3 As shown, the expansion valve 100 of this application also includes an annular gasket 62, which is located between the elastic member 61 and the abutment portion 53. Since the guide sleeve 30 rotates relative to the valve body assembly 10, it also acts on the elastic member 61, causing the elastic member 61 to rotate relative to the valve body assembly 10. It is understood that the annular gasket 62 reduces the friction between the elastic member 61 and the abutment portion 53, thereby reducing the rotational torque transmitted from the guide sleeve 30 to the plug 50. This further reduces the rotation angle of the plug 50, reduces the friction between the plug 50 and the side wall of the valve port 21 due to rotation, and further improves the sealing performance of the expansion valve 100 of this application.

[0080] In one embodiment, the annular gasket 62 is a lubricating plastic gasket.

[0081] In one embodiment, along the direction of movement of the plug 50, the guide length between the guide sleeve 30 and the inner wall of the valve body assembly 10 is L, and the minimum distance between the guide sleeve 30 and the inner wall of the valve body assembly 10 is D. Wherein, L / D≥100.

[0082] When L / D < 100, it may cause the guide length between the guide sleeve 30 and the valve body assembly 10 to be too small, or the minimum gap between the guide sleeve 30 and the inner wall of the valve body assembly 10 to be too large.

[0083] Specifically, when the guide length is too small, the guiding fit between the valve body assembly 10 and the guide sleeve 30 has limited effect on limiting the radial wobble of the guide sleeve 30, which may result in the guide sleeve 30 still having relatively severe radial wobble, thus causing greater friction between the plug 50 and the valve port 21, affecting the sealing performance of the expansion valve 100 of this application.

[0084] When the gap between the guide sleeve 30 and the inner wall of the valve body assembly 10 is too large, the radial distance between the inner wall of the valve body assembly 10 and the guide sleeve 30 is relatively large, and the radial wobble distance of the screw 40 is also relatively large. This reduces the limiting effect of the valve body assembly 10 on the radial wobble of the guide sleeve 30, thereby affecting the sealing performance of the expansion valve 100 of this application.

[0085] Therefore, L / D≥100 can ensure that the guiding fit between the valve body assembly 10 and the guide sleeve 30 restricts the radial sway of the guide sleeve 30, thereby improving the sealing performance of the expansion valve 100 of this application.

[0086] Please see Figure 6 The diagram shown is a structural schematic of the valve body 11 provided in one embodiment of this application. See also: Figure 1 .

[0087] like Figure 1 and Figure 6 As shown, a guide portion 113 is provided in the through hole 112 of the valve body 11. The guide portion 113 is guided and engaged with the guide sleeve 30 so that the guide portion 113 can cooperate with the outer wall of the guide sleeve 30 to further restrict the shaking of the guide sleeve 30. The guiding length L between the guide sleeve 30 and the inner wall of the valve body assembly 10 is the length of the guide portion 113, and the minimum gap D between the guide sleeve 30 and the valve body assembly 10 should be the minimum gap between the guide portion 113 and the outer wall of the guide sleeve 30.

[0088] Understandably, in some other embodiments, a guide portion (not shown in the figure) may protrude from the outside of the guide sleeve 30, allowing the guide portion to engage with the wall of the through hole 112, thereby restricting the wobbling of the guide sleeve 30. Correspondingly, the guide length L between the guide sleeve 30 and the inner wall of the valve body assembly 10 is the length of the guide portion, and the minimum gap D between the guide sleeve 30 and the valve body assembly 10 should be the minimum gap between the guide portion and the wall of the through hole 112.

[0089] In one embodiment, the outer wall of the guide sleeve 30 is guided to the wall of the through hole 112, so that the guide sleeve 30 can cooperate with the wall of the through hole 112 to limit the radial wobble of the guide sleeve 30. Correspondingly, the guiding length L between the guide sleeve 30 and the inner wall of the valve body assembly 10 is the overall length of the guide sleeve 30, and the minimum gap D between the guide sleeve 30 and the valve body assembly 10 should be the minimum gap between the guide sleeve 30 and the wall of the through hole 112.

[0090] In one embodiment, such as Figures 1-3 As shown, the screw 40 also includes a connected body 41 and a third limiting part 42. The body 41 is provided with a first threaded connection part 411, which is used to match the thread in the threaded hole 1211, thereby realizing the threaded engagement between the screw 40 and the threaded hole 1211. The third limiting part 42 is housed in the first cavity 30a and is fixedly connected to the guide sleeve 30.

[0091] Understandably, when the screw 40 moves along its own axis in conjunction with the threaded hole 1211, the guide sleeve 30 will move synchronously under the fixing effect of the third limiting part 42 and the guide sleeve 30, thereby ensuring the transmission of the movement of the screw 40 by the guide sleeve 30.

[0092] In one embodiment, the third limiting portion 42 of the screw 40 is housed within the first cavity 30a and movably connected to the guide sleeve 30. Since the screw 40 slides relative to the valve body assembly 10 along its own axis while also rotating relative to it, it is understood that movably connecting the screw 40 to the guide sleeve 30 can reduce the rotational transmission of the screw 40 to the guide sleeve 30 while ensuring that the guide sleeve 30 and the screw 40 slide synchronously relative to the valve body assembly 10. Combined with the connection between the guide sleeve 30 and the plug 50, this further reduces the rotation of the plug 50 relative to the valve body assembly 10, thereby further reducing the relative friction between the plug 50 and the valve port 21, and further improving the sealing performance of the expansion valve 100 of this application.

[0093] The guide sleeve 30 has a limiting structure (not shown in the figure) at its end near the body 41, and the third limiting part 42 extends into the first cavity 30a through the limiting structure. Understandably, the limiting structure prevents the third limiting part 42 from dislodging from the guide sleeve 30 in a direction away from the plug 50. This ensures the movable connection between the third limiting part 42 and the guide sleeve 30.

[0094] In one embodiment, such as Figure 1 As shown, the expansion valve 100 of this application also includes a magnetic rotor 71, which is fixed to the outer edge of the valve core 12. The body 41 passes through the threaded hole 1211 and is connected to the magnetic rotor 71 for transmission. It can be understood that when the magnetic rotor 71 is energized and rotates relative to the valve body assembly 10, it can drive the screw 40 to rotate relative to the valve body assembly 10. That is, the arrangement of the magnetic rotor 71 realizes the opening and closing functions of the expansion valve 100 of this application.

[0095] Please see Figure 7 The diagram shown is a structural schematic of the valve core 12 provided in one embodiment of this application. See also: Figure 1 .

[0096] In one embodiment, such as Figure 1 and Figure 7 As shown, the valve core 12 includes a connecting section 121 and a positioning section 122 connected together. The connecting section 121 has a threaded hole 1211, and the positioning section 122 has a movable cavity 1221. The positioning section 122 extends into the through hole 112 and is fixedly connected to the wall of the through hole 112. The threaded hole 1211, the movable cavity 1221, and the through hole 112 cooperate to form an internal space 10a.

[0097] The outer edge of the connecting section 121 is also provided with a second threaded connection portion 1212, and limiting protrusions (not shown in the figure) are provided at opposite ends of the second threaded connection portion 1212. The expansion valve 100 of this application also includes a limiting spring 72, which is sleeved on the second threaded connection portion 1212 and located between the two limiting protrusions, and can rotate and slide along the second threaded connection portion 1212. Among them, the magnetic rotor 71 is provided with a push rod (not shown in the figure), one end of which abuts against one end of the limiting spring 72.

[0098] When the magnetic rotor 71 is energized, the screw 40 rotates simultaneously, and the push rod also rotates, pushing the limiting spring 72 to rotate and slide around the second threaded connection 1212. When the limiting spring 72 slides to the limiting protrusion at one end of the second threaded connection 1212, the magnetic rotor 71 stops driving the screw 40 to rotate. At this time, the expansion valve 100 of this application is in the open or closed state.

[0099] That is, the matching arrangement of the limit spring 72 and the second threaded connection 1212 enables control over the opening and closing process of the expansion valve 100.

[0100] Please see Figure 8 The diagram shows another structural schematic of the expansion valve 100 provided in one embodiment of this application. See also... Figure 1 and Figure 4 .

[0101] like Figure 1 , Figure 4 and Figure 8 As shown, the outer wall of the guide sleeve 30 is provided with a venting groove 32, which extends through the guide sleeve 30 along the sliding direction of the guide sleeve 30. One end of the venting groove 32 is connected to the first channel 1111, and the other end is connected to the movable cavity 1221.

[0102] like Figure 1 As shown, part of the guide sleeve 30 and part of the screw 40 are housed within the movable cavity 1221. It is understood that the vent groove 32 allows for ventilation between the guide sleeve 30 and the surrounding environment on both sides, preventing the pressure difference between the two sides of the guide sleeve 30 from affecting the sliding process of the screw 40 and the guide sleeve 30 during the sliding process. This, in turn, ensures the opening and closing functions of the expansion valve 100 of this application.

[0103] In one embodiment, such as Figure 4 As shown, there are multiple venting slots 32, which are evenly distributed along the circumference of the guide sleeve 30. It is understood that in other embodiments, the number, shape, and distribution position of the venting slots 32 may be different, and this application does not impose any particular limitations on this.

[0104] In one embodiment, such as Figure 7 and Figure 8 As shown, the positioning section 122 is provided with a first vent hole 1222, and the side wall of the connecting section 121 is provided with a second vent hole 1213 that penetrates the threaded hole 1211. The first vent hole 1222 is located on the inner wall of the movable cavity 1221 to connect the movable cavity 1221 and the outer edge of the valve core 12, and the second vent hole 1213 connects the threaded hole 1211 and the outer edge of the valve core 12.

[0105] Understandably, the first vent 1222 and the second vent 1213, in conjunction with the vent groove 32, enable the threaded hole 1211 to communicate with the external environment, thereby ensuring that the air pressure on both sides of the screw 40 is consistent when the magnetic rotor 71 drives the screw 40 to rotate. This further ensures the opening and closing functions of the expansion valve 100 of this application.

[0106] In one embodiment, such as Figure 1 and Figure 7As shown, a positioning boss 114 protrudes from the outer edge of the valve body 11. The expansion valve 100 of this application also includes a protective cover 80, which is sleeved on the outer edge of the magnetic rotor 71 and fixed to the positioning boss 114. The protective cover 80, in conjunction with the positioning boss 114, seals the magnetic rotor 71, thereby preventing external impurities from affecting the magnetic rotor 71 and ensuring the opening and closing functions of the expansion valve 100 of this application.

[0107] In one embodiment, such as Figure 1 and Figure 7 As shown, the outer edge of the valve body 11 is also provided with a third threaded connection part 115, which is used to connect with an external structure to fix the expansion valve 100 of this application.

[0108] In one embodiment, such as Figure 1 and Figure 7 As shown, the outer edge of the valve body 11 is also provided with a first mounting groove 116. The expansion valve 100 of this application also includes a first sealing ring 91, which is fixed in the first mounting groove 116 so as to cooperate with the external structure to achieve sealing of the external structure when the expansion valve 100 of this application is connected to the external structure.

[0109] In one embodiment, such as Figure 1 and Figure 2 As shown, the valve seat 20 is provided with a second mounting groove 22. The expansion valve 100 of this application also includes a second sealing ring 92, which is fixed in the second mounting groove 22 so as to cooperate with the external structure to achieve sealing of the external structure when the expansion valve 100 of this application is connected to the external structure.

[0110] It should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0111] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0112] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Those skilled in the art will understand that implementing all or part of the processes of the above embodiments, and making equivalent changes according to the claims of this invention, still falls within the scope of this invention.

Claims

1. An expansion valve, characterized in that, include: The valve body assembly has an internal space, a first channel, and a second channel, wherein the first channel is connected to the internal space; A guide sleeve is movably disposed within the internal space, forming a first cavity and a second cavity that are connected. The guide sleeve guides and engages with the inner wall of the valve body assembly along the direction of movement. The plug includes a first limiting part and an adjusting part that are fixedly connected. The first limiting part is movably disposed in the first cavity, and the adjusting part extends out of the second cavity, so that the plug can move with the guide sleeve. A screw is threadedly engaged with the valve body assembly. The screw is connected to a guide sleeve, allowing the screw to rotate along its axial direction and drive the guide sleeve to move relative to the valve body assembly along the screw's axis, thereby driving the adjustment part to adjust the fluid flow rate between the second channel and the internal space. An elastic element, at least partially disposed within the second cavity, pushes against the plug in a direction away from the screw; The guide sleeve is provided with a second limiting part, which is located between the first cavity and the second cavity. The first limiting part is movably disposed between the screw and the second limiting part. The elastic element has a first end and a second end that are opposite to each other. The first end abuts against the second limiting part, and the second end abuts against the plug. The plug is provided with an abutting part located between the first limiting part and the adjusting part, and the second end abuts against the abutting part. The abutting part guides and cooperates with the inner wall of the guide sleeve along the movement direction of the plug, and the movement direction of the plug is parallel to the axial direction of the screw.

2. The expansion valve according to claim 1, characterized in that, The first limiting portion includes a curved surface structure, the curved surface structure being used to abut against the second limiting portion; and / or The second limiting part is conical, and the diameter of the second limiting part gradually increases toward the adjusting part.

3. The expansion valve according to claim 1, characterized in that, The expansion valve further includes an annular gasket, which surrounds the periphery of the plug and is located between the second end and the abutment portion.

4. The expansion valve according to claim 3, characterized in that, The annular gasket is a lubricating plastic gasket.

5. The expansion valve according to claim 1, characterized in that, The guide length between the guide sleeve and the inner wall of the valve body assembly is L, and the minimum distance between the guide sleeve and the valve body assembly is D, where L / D≥100.

6. The expansion valve according to any one of claims 1-5, characterized in that, The screw is at least partially housed within the first cavity.

7. The expansion valve according to claim 6, characterized in that, The screw is fixedly connected to the guide sleeve.

8. The expansion valve according to claim 6, characterized in that, The screw is movably connected to the guide sleeve.

9. The expansion valve according to claim 8, characterized in that, The screw includes a fixedly connected body and a third limiting part. The body is threadedly engaged with the valve body assembly, and the third limiting part is movably disposed within the first cavity.

10. The expansion valve according to claim 9, characterized in that, The guide sleeve has a limiting structure at its end near the body. The third limiting part extends into the first cavity through the limiting structure. The limiting structure is used to prevent the third limiting part from coming out of the guide sleeve in a direction away from the plug.

11. The expansion valve according to any one of claims 1-5, characterized in that, The valve body assembly includes a valve body body and a valve core. The valve body body has a through hole. The first channel and the second channel are located on the valve body body and are respectively connected to the through hole. The valve core has a threaded hole, and part of the valve core extends into the through hole and is fixed to the hole wall of the through hole to form the internal space. The screw extends into the threaded hole and is threadedly engaged with the valve core.

12. The expansion valve according to claim 11, characterized in that, The expansion valve also includes a magnetic rotor, which is fixed to the outer edge of the valve core. The end of the screw away from the plug also passes through the threaded hole and is connected to the magnetic rotor for transmission. The magnetic rotor is used to drive the screw to rotate.

13. A heat pump, characterized in that, The device includes a first pipe, a second pipe, and an expansion valve as described in any one of claims 1-12, wherein a first channel of the expansion valve is connected to the first pipe, a second channel of the expansion valve is connected to the second pipe, and the expansion valve is used to control the flow rate of fluid flowing between the first pipe and the second pipe.

14. A vehicle, characterized in that, It includes a vehicle body and a heat pump as described in claim 13, the heat pump being housed within the vehicle body.

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