Valve device

Abstract

The invention provides a valve device which comprises a rotor assembly and a valve seat, and a clamping groove is formed in the rotor assembly in the circumferential direction; the valve seat is provided with a containing cavity, and part of the rotor assembly is contained in the containing cavity. A clamping hole is formed in the valve seat, and an opening communicated with the containing cavity is formed in the wall, where the containing cavity is formed, of the clamping hole; the valve device further comprises a stop piece, part of the stop piece is located in the clamping groove, the rotor assembly can rotate relative to the stop piece, and the other part of the stop piece is located in the clamping hole so as to limit axial movement of the stop piece along the valve device. According to the valve device, the rotor assembly and the valve seat are connected through the stop piece, the rotor assembly is axially limited, and the limiting structure is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, in particular to a valve device. BACKGROUND

[0002] In an automobile air conditioning system, in order to improve the flow control accuracy of the working medium, an electronic expansion valve is often used as a throttling element. The existing electronic expansion valve drives the up-and-down reciprocating movement of the valve core through the circumferential and axial movement of the rotor assembly. Thus, the axial movement of the rotor assembly involves a stroke space, resulting in a relatively large volume of the electronic expansion valve. In order to reduce the volume of the valve device, the rotor assembly can be axially limited. However, the existing electronic expansion valve has a large number of components, and the limiting structure of the rotor assembly is complex. SUMMARY

[0003] The purpose of the present application is to provide a valve device with a simple limiting structure.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a rotor assembly and a valve seat are provided, the rotor assembly is provided with a clamping groove in the circumferential direction; the valve seat is provided with a receiving cavity, part of the rotor assembly is accommodated in the receiving cavity; the valve seat is provided with a clamping hole, the clamping hole has an opening communicating with the receiving cavity in the wall forming the receiving cavity; the valve device further comprises a stop piece, part of the stop piece is located in the clamping groove, the rotor assembly can rotate relative to the stop piece, and another part of the stop piece is located in the clamping hole to limit the axial movement of the stop piece along the valve device.

[0005] The valve device provided by the present application has the following advantages: on the one hand, part of the rotor assembly is accommodated in the receiving cavity of the valve seat, the rotor assembly is provided with a clamping groove in the circumferential direction, part of the stop piece is located in the clamping groove, and the rotor assembly can rotate relative to the stop piece, so as to ensure that the rotor assembly can make circumferential movement relative to the valve seat; on the other hand, another part of the stop piece is located in the clamping hole to limit the axial movement of the stop piece along the valve device. When the rotor assembly is working, part of the stop piece is located in the clamping groove of the rotor assembly, so that the up-and-down movement of the rotor assembly cannot be axially moved due to the axial limiting of the stop piece, thereby limiting the tendency of the rotor assembly to move axially when rotating in the circumferential direction, and achieving the axial limiting of the rotor assembly. It can be seen that the valve device provided by the present application connects the rotor assembly and the valve seat through the stop piece, limits the axial movement of the rotor assembly, and has a simple limiting structure and can reduce the number of components. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 The cross-sectional structure diagram of an embodiment of the valve device provided by the present application is shown in the figure;

[0007] Figure 2 The cross-sectional structure diagram of an embodiment of the valve device provided by the present application is shown in the figure;Figure 1 Structure diagram of the rotor assembly in the middle;

[0008] Figure 3 For Figure 1 Structure diagram of the valve seat in the middle;

[0009] Figure 4 For Figure 1 Assembly diagram of the rotor assembly (omitting the magnetic part) and the valve seat in the middle;

[0010] Figure 5 For Figure 1 Assembly diagram of the rotor assembly, the valve seat and the stopper in the middle;

[0011] Figure 6 For Figure 1 Assembly diagram of the valve seat and the stopper in the middle;

[0012] Figure 7 For Figure 1 Assembly diagram of the rotor assembly and the stopper in the middle;

[0013] Figure 8 For Figure 1 Structure diagram of the valve seat in the middle from another perspective;

[0014] Figure 9 For Figure 1 Structure diagram of the valve seat in the middle from a cross section;

[0015] Figure 10 For Figure 1 Structure diagram of the stopper in the middle;

[0016] Figure 11 For Figure 6 Top view of the middle;

[0017] Figure 12 For Figure 1 Structure diagram of the rotor assembly in the middle (without the magnetic part);

[0018] Figure 13 Structure diagram of another embodiment of the rotor assembly provided in the application;

[0019] Figure 14 For Figure 13 Structure diagram of a part in the middle;

[0020] Figure 15 For Figure 13 Another structure diagram of a part in the middle;

[0021] Figure 16 For Figure 1 Structure diagram of the screw rod in the middle;

[0022] Figure 17Fig. 1 is a schematic view of a valve device according to an embodiment of the present application; Figure 1 Fig. 2 is a schematic view of a sectional structure of a valve core in the valve device of Fig. 1;

[0023] Figure 18 Fig. 3 is a schematic view of a sectional structure of a valve core in the valve device of Fig. 1. Figure 1

[0024] Reference signs in the drawings are explained as follows:

[0025] 1. sleeve assembly;

[0026] 2. rotor assembly; 20, sliding piece; 201, first sliding bearing; 202, second sliding bearing; 21, magnetic part; 22, rotating nut; 200, clamping groove; 210, hollow cavity; 220, screw rod receiving cavity;

[0027] 3. valve seat; 30, receiving cavity; 300, clamping hole; 32, opening; 33, hole wall; 34, anti-falling groove; 340, groove wall;

[0028] 4. stopper; 40, stopper part; 401, first stopper part; 402, second stopper part; 400, groove part;

[0029] 5. valve core assembly; 50, anti-falling part; 51, screw rod; 52, valve core; 501, axial opening; 502, radial opening; 520, large diameter part; 503, side wall;

[0030] 6. nut; 60, reinforcing rib; 600, mounting hole; 7, bearing; 8, magnetic part; 80, mounting groove; 9, bushing; 90, protrusion. DETAILED DESCRIPTION

[0031] As can be known from the background art, the existing valve device has a large number of components and a complex limiting structure of the rotor assembly.

[0032] In order to simplify the limiting structure of the valve device, an embodiment of the present application provides a valve device, which connects the rotor assembly and the valve seat through a stopper to axially limit the rotor assembly, and the limiting structure is simple.

[0033] The present application will be further described in detail below with reference to the drawings and specific embodiments.

[0034] It should be noted that the axial direction in the present application refers to the A direction in Figure 1 Figure 1 the R direction in.

[0035] Please refer to Figures 1-9 ​The valve device provided by the application comprises a rotor assembly 2 and a valve seat 3, the rotor assembly 2 is provided with a clamping groove 200 in the circumferential direction; the valve seat 3 is provided with a containing cavity 30, and part of the rotor assembly 2 is contained in the containing cavity 30; the valve seat 3 is provided with a clamping hole 300, the clamping hole 300 has an opening 32 communicating with the containing cavity 30 on the wall forming the containing cavity 30; the valve device further comprises a stop piece 4, part of the stop piece 4 is located in the clamping groove 200, the rotor assembly 2 can rotate relative to the stop piece 4, and another part of the stop piece 4 is located in the clamping hole 300 to limit the axial movement of the stop piece 4 along the valve device.

[0036] The rotor assembly 2 is provided with a clamping groove 200 in the circumferential direction, and the clamping groove 200 has a whole annular structure, thereby ensuring that the rotor assembly 2 can rotate relative to the stop piece 4.

[0037] It is easy to understand that part of the stop piece 4 is located in the clamping groove 200, and the rotor assembly 2 can rotate relative to the stop piece 4, which means that the positional relationship between the stop piece 4 and the rotor assembly 2 is relatively independent, the stop piece 4 and the clamping groove 200 can be in a small gap fit, and the stop piece 4 will not limit the circumferential rotation of the rotor assembly 2.

[0038] It should be noted that another part of the stop piece 4 is located in the clamping hole 300 to limit the axial movement of the stop piece 4 along the valve device, and part of the stop piece is located in the clamping groove of the rotor assembly, so that the rotor assembly cannot move axially when moving up and down due to the limitation of the stop piece, thereby limiting the axial movement of the rotor assembly. Of course, the axial movement of the rotor assembly is not absolutely not moving, and within the tolerance range, the rotor assembly can move up and down in a small range.

[0039] To improve the coaxiality of the rotor assembly 2 and the valve seat 3, the lower end of the rotor assembly 2 contained in part of the containing cavity 30 can be circumferentially matched with the valve seat, thereby reducing the risk of valve core jamming caused by left and right shaking of the rotor assembly.

[0040] To further improve the stability of the axial limiting of the rotor assembly 2, when the stop piece 4 is installed on the valve seat 3 and the rotor assembly 2, part of the stop piece 4 abuts against the clamping groove 200, and another part of the stop piece abuts against at least part of the hole wall 33 of the clamping hole 300. Abutting means that during the rotation of the rotor assembly, although the stop piece can be in contact with the valve seat and the rotor assembly, it does not affect the rotation of the rotor assembly.

[0041] To reduce the wear of the rotor assembly 2, the friction coefficient between the stopper 4 and the rotor assembly 2 can be less than or equal to 0.06, for example, the friction coefficient can be 0.05, 0.04, 0.03-0.01, of course, under the condition of ensuring the strength of the material, reducing the friction coefficient between the stopper and the rotor assembly can reduce the risk of jamming. Similarly, the friction coefficient between the stopper and the valve seat can also be less than or equal to 0.06, for example, the friction coefficient can be 0.05, 0.04, 0.03-0.01, of course, under the condition of ensuring the strength of the material, by reducing the friction coefficient between the stopper and the valve seat, the risk of jamming can be further reduced.

[0042] To further reduce the friction between the stopper 4 and the rotor assembly 2, in a specific embodiment, part of the stopper 4 is only in contact with part of the annular groove of the rotor assembly 2, so as to reduce the purpose of wear by reducing the contact area, to further reduce the risk of jamming. Of course, in other embodiments, the contact area between the stopper 4 and the annular groove is not limited.

[0043] The shape of the clamping hole 300 is not limited, and the opening 32 of the clamping hole 300 can be an arc-shaped opening to facilitate the installation of the stopper. Of course, in other embodiments, the shape of the clamping hole is not limited, as long as the installation of the stopper can be realized and the axial movement of the stopper can be limited by the hole wall of the clamping hole. For example, the hole diameter shape of the clamping hole can also match the axial cross-sectional shape of the stopper.

[0044] In a specific embodiment, in order to reduce the risk of the stopper 4 falling off along the clamping hole 300, the stopper 4 includes a fixedly connected stopper portion 40 and an anti-falling portion 50, the extension direction of the stopper portion 40 and the extension direction of the anti-falling portion 50 are different, at least part of the anti-falling portion 50 abuts against the valve seat 3, at least part of the stopper portion 40 is located in the clamping groove 200, and another part of the stopper portion 40 passes through the clamping hole 300 and abuts against part of the hole wall of the clamping hole 300, and the anti-falling portion 50 is adapted to limit the stopper portion 40 from falling out along the clamping hole 300. Of course, in other embodiments, the stopper can also only include a stopper portion, as long as it can play a role in limiting the axial movement of the stopper.

[0045] It should be noted that at least part of the anti-falling portion 50 abuts against the valve seat 3, which means that the contact area between the anti-falling portion 50 and the valve seat 3 is not limited, as long as it can play a role in limiting the stopper portion 40 from falling out along the clamping hole 300. At the same time, the position of the anti-falling portion 50 installed on the valve seat 3 is not limited, as long as it can play a role in limiting the stopper portion 40 from falling out along the clamping hole 300.

[0046] Of course, in order to facilitate installation and avoid interference between the anti-falling portion 50 and other components such as the sleeve assembly, in a specific embodiment, the anti-falling portion 50 is arranged on the valve seat 3, and the anti-falling portion 50 is arranged on the valve seat 3. The anti-falling portion 50 is arranged on the valve seat 3, and the anti-falling portion 50 is arranged on the valve seat 3. Figure 5As shown, the wall of the accommodating cavity 30 can be provided with an anti-falling groove 34, the opening direction of the anti-falling groove 34 is away from the accommodating cavity 30, the anti-falling part 50 is in contact with at least part of the wall 340 forming the anti-falling groove 34, and the projection of the outer contour of the anti-falling part 50 on the cross section perpendicular to the axial direction of the valve device is within the projection of the maximum outer contour of the valve seat 3.

[0047] It should be noted that the anti-falling part is in contact with at least part of the wall forming the anti-falling groove, which means that in one embodiment, the anti-falling part can be completely installed in the anti-falling groove, the shape of the anti-falling part completely matches the shape of the anti-falling groove, and the anti-falling part is completely clamped on the groove wall of the anti-falling groove; in another embodiment, the anti-falling part can also be partially in contact with the groove wall of the anti-falling groove.

[0048] Please refer to Figure 10 and Figure 11 In a specific embodiment, the stop part 40 includes a first stop part 401 and a second stop part 402, one end of the anti-falling part 50 is connected to the first stop part 401, the other end of the anti-falling part 50 is connected to the second stop part 402, the first stop part 401 and the second stop part 402 are located on the same side of the anti-falling part 50, the contact area between the first stop part 401 and the clamping groove 200 is defined as the first area A, the contact area between the second stop part 402 and the clamping groove 200 is defined as the second area B, and the first area A and the second area B are symmetrical about the center O of the clamping groove 200. In this way, the coaxiality of the rotor assembly 2 and the valve seat 3 can be ensured when the rotor assembly 2 rotates, and the risk of the rotor assembly 2 being stuck when it is in contact with the stop piece 4 can be reduced.

[0049] It should be noted that Figure 11 is a top view of the assembly of the stop piece and the valve seat, which does not include the rotor assembly, but for the convenience of description, the clamping groove 200 of the rotor assembly is represented by a dashed line in Figure 11 .

[0050] It should be noted that the first stop part 401 and the second stop part 402 are located on the same side of the anti-falling part 50, which means that the parts of the first stop piece and the second stop piece that function to axially limit the rotor assembly are located on the same side of the anti-falling part, but it does not limit that part of the first stop piece and the second stop piece are located on the other side of the anti-falling part. If other parts of the first stop piece and the second stop piece are also located on the other side of the anti-falling part, it is also within the protection scope of the present application.

[0051] In order to further ensure the coaxiality of the rotor assembly 2 and the valve seat 3 and facilitate processing, in a specific embodiment, the stop piece 4 can be a symmetrical piece, and the shapes of the first stop part 401 and the second stop part 402 are basically the same. Of course, in other embodiments, the shapes of the first stop part and the second stop part can also be different, or the lengths of the first stop piece and the second stop piece can be different.

[0052] Specifically, please refer to Figure 10 For the convenience of processing and installation, the overall shape of the stop piece 4 is U-shaped, the shape of the first stop portion 401 is a cylindrical segment, the shape of the second stop portion 402 is a cylindrical segment, and the shape of the anti-disengagement portion 50 is an arc segment. Correspondingly, the number of the clamping holes 300 is two, and each clamping hole 300 is distributed along the axis of the valve seat in a central symmetry.

[0053] In order to prevent the stop piece 4 from interfering with other components and at the same time facilitate installation, in one specific embodiment, the anti-disengagement portion 50 is in the shape of an arc segment, and the curvature of the outer arc surface of the anti-disengagement portion 50 is the same as the curvature of the outer ring surface of the valve seat 3. In this way, the stop piece 4 does not protrude from the outer surface of the valve seat body, thereby improving the adaptability of the sleeve assembly. Of course, in other embodiments, the shape of the anti-disengagement portion is not limited.

[0054] The valve device provided by the present application has the following advantages. On the one hand, part of the rotor assembly is accommodated in the accommodating cavity of the valve seat, the rotor assembly is provided with a clamping groove in the circumferential direction, part of the stop piece is located in the clamping groove, and the rotor assembly can rotate relative to the stop piece, thereby ensuring that the rotor assembly can make circumferential movement relative to the valve seat. On the other hand, another part of the stop piece is located in the clamping hole to limit the axial movement of the stop piece along the valve device. When the rotor assembly is working, the part of the stop piece is located in the clamping groove of the rotor assembly, so that if the rotor assembly moves up and down, it cannot move axially due to the axial positioning of the stop piece, thereby being able to limit the tendency of the rotor assembly to move axially when rotating circumferentially, and axial positioning of the rotor assembly is achieved. It can be seen that the valve device provided by the present application connects the rotor assembly and the valve seat through the stop piece, axially positions the rotor assembly, and the limiting structure is simple and can reduce the number of components.

[0055] Please continue to refer to Figure 2 In one specific embodiment, the rotor assembly 2 can include a fixedly connected magnetic portion 21 and a rotating nut 22, and further include a sliding piece 20 arranged at the end or the outer circumferential side of the magnetic portion 21. The sliding piece 20 is circumferentially matched with the sleeve assembly 1, and the outer diameter size of the sliding piece 20 is greater than the outer diameter size of the magnetic portion 21. In this way, during the rotation of the rotor assembly 2, the rotor assembly 2 does not contact the sleeve assembly 1, and the friction between the rotor assembly 2 and the sleeve assembly 1 can be reduced. The sliding piece 20 plays a role in radially positioning the rotor assembly, and further ensures the coaxiality of the rotor assembly 2 and the valve seat 3 during work.

[0056] It should be noted that the outer diameter size of the sliding piece 20 is greater than the outer diameter size of the magnetic portion 21, which means that in the radial direction of the valve device, the outer surface of the sliding piece 20 is farther away from the center of the valve device than the outer surface of the magnetic portion 21.

[0057] The sliding member 20 can be disposed at the end of the magnetic part 21 or on the outer periphery of the magnetic part 21, as long as it can serve to replace the rotor assembly 2 in contact with the sleeve assembly 1.

[0058] Specifically, the sliding member 20 may include a first sliding bearing 201 and a second sliding bearing 202. Along the axial direction of the valve device, the first sliding bearing 201 is disposed at the upper end of the magnetic part 21, and the second sliding bearing 202 is disposed at the lower end of the magnetic part 21. (Reference) Figure 1 The outer surfaces of the first sliding bearing 201 and the second sliding bearing 202 contact the inner wall of the sleeve assembly 1, ensuring the coaxiality of the rotor assembly 2 and the valve seat 3. The first sliding bearing 201 and the second sliding bearing 202 are clearance-fitted with the inner wall of the sleeve assembly 1. By setting the first sliding bearing 201 and the second sliding bearing 202, and placing them at the upper and lower ends of the magnetic part 21 respectively, the overall stability of the rotor assembly 2 during rotation is ensured. This not only reduces the friction between the rotor assembly 2 and the inner wall of the sleeve assembly 1 during high-speed rotation but also further improves the coaxiality between the rotor assembly 2 and the valve seat during rotation.

[0059] Continue to refer to Figure 2 The rotor assembly 2 includes a magnetic part 21 and a rotating nut 22 fixedly connected. The magnetic part 21 is sleeved on the rotating nut 22, and a snap-fit ​​groove 200 is formed in the rotating nut 22. The magnetic part is located above the snap-fit ​​groove 200. Specifically, the magnetic part 21 and the rotating nut 22 can be injection molded together. Of course, in other embodiments, the fixing method of the magnetic part 21 and the rotating nut 22 is not limited, and they can also be fixed together by welding, bonding, or limiting connection, etc. The rotating nut 22 in the rotor assembly 2 is connected to the valve seat 3 by a stop 4. The stop 4 and the snap-fit ​​groove 200 are in a small clearance fit, which restricts the axial movement of the rotor assembly 2. The bottom of the rotating nut 22 and the valve seat 3 are in a circumferential fit, and their coaxiality can prevent the rotating nut 22 from wobbling left and right, which would cause the valve core 52 to jam.

[0060] Please combine Figure 1 refer to Figure 12 The rotating nut 22 has a hollow cavity 210 and a lead screw receiving cavity 220 that are connected to each other. A reinforcing rib 60 is provided between the cavity wall of the lead screw receiving cavity 220 and the cavity wall of the hollow cavity 210. Specifically, multiple reinforcing ribs 60 are evenly distributed around the circumference of the threaded hole of the rotating nut 22, which can strengthen the strength of the threaded engagement and ensure that the rotating nut 22 and the lead screw 51 are coaxial during transmission. At the same time, the hollow structure inside the rotating nut 22 can reduce the weight of the rotating nut, reduce material usage, and lower costs.

[0061] Of course, in another embodiment, the rotating nut in the rotor assembly 2 structure can also be a split nut structure. Please refer to... Figure 1 refer to Figures 13-15 The rotor assembly 2 consists of a sliding bearing 7, a plastic bushing 9, a magnet 8, and a nut 6. The nut 6 is also axially limited by the stop 4 and the valve seat 3. The sliding bearing 7 and the inner wall of the sleeve assembly 1 are in a small clearance fit, and the outer end face of the nut 6 and the inner wall of the sleeve assembly 1 are in a small clearance fit. Furthermore, the sliding bearing 7 and the nut 6 have the same outer diameter to ensure that the rotor assembly 2 can rotate inside the sleeve assembly 1.

[0062] Continue to refer to Figure 1 and Figure 3 In one specific embodiment, the valve device provided in this application further includes a valve core assembly 5, which is drivenly connected to the rotor assembly 2; the valve core assembly 5 includes a lead screw 51 and a valve core 52 drivenly connected; the lead screw 51 is drivenly connected to the rotor assembly 2, and the valve seat 3 has a mounting hole 600. The axial cross-sectional shape of the hole wall of the mounting hole 600 is non-circular. The lead screw 51 cooperates with the mounting hole 600 to restrict the lead screw 51 from rotating around the circumference of the valve device, thereby converting the rotational motion of the rotor assembly 2 into the linear motion of the valve core assembly 5.

[0063] Specifically, in combination Figure 1 and Figure 3 And refer to Figure 16 The wall of the mounting hole has a groove 400, and the lower end of the lead screw 51 has a protrusion 90. The protrusion 90 and the groove 400 cooperate to form an anti-rotation structure. When the rotor assembly 2 drives the lead screw 51 to rotate, due to the anti-rotation structure between the lead screw 51 and the valve seat 3, the lead screw 51 moves up and down along the groove 400. The lead screw 51 is movably connected to the valve core 52, and the lead screw 51 drives the valve core 52 to move axially up and down. The up and down axial movement of the valve core 52 reduces the overall assembly accuracy requirements of the valve device. Of course, in other embodiments, a protrusion can be provided on the valve seat, and a groove can be provided on the lead screw to form an anti-rotation structure.

[0064] The valve core assembly 5 and the rotor assembly 2 are connected by threads. The lead screw 51 in the valve core assembly 5 can adopt a trapezoidal thread structure, which engages with the rotor assembly 2 for axial movement. By using a trapezoidal thread, the transmission efficiency can be improved and the jamming phenomenon caused by thread self-locking can be reduced. Of course, in other embodiments, the thread form of the lead screw is not limited.

[0065] refer to Figures 16-18In one specific embodiment, a mounting groove 80 is provided at the lower end of the lead screw 51, and the large-diameter portion 520 of the valve core 52 is engaged in the mounting groove 80. The depth of the mounting groove 80 is greater than the height of the large-diameter portion 520 of the lead screw 51. The lead screw 51 and the valve core 52 adopt a nested structure, and the valve core 52 and the valve seat 3 have a small clearance fit, ensuring the coaxiality of the valve core assembly 5 and the valve seat. For details, please refer to... Figure 16 The mounting groove 80 may include an axial opening 501 and a radial opening 502. During assembly, the valve core 52 is inserted into the lead screw 51 along the radial opening 502, and the lower surface of the large-diameter portion 520 of the valve core 52 engages with the side wall 503 of the mounting groove 80. To improve the coaxiality of the lead screw 51 and the valve seat 3 during axial movement and reduce the risk of jamming, the circumferential surface of the large-diameter portion 520 may mate with the side wall of the mounting groove 80. Of course, in other embodiments, it is sufficient to ensure that the lead screw can engage with the mounting groove. The valve device provided in this application can change the valve core from its original rotational and vertical movement to vertical axial movement, while reducing the assembly accuracy requirements of the valve core. The valve core and the lead screw can be connected without connecting parts, further reducing the number of parts.

[0066] In one specific embodiment, the valve seat 3 is made of aluminum alloy, and the valve core 52 is made of steel. Thus, when the valve core 52 moves axially to close the valve port, the relatively soft valve seat 3 can achieve a "wrapping" effect on the relatively hard valve core, reducing the wear on the valve core 52. Of course, in other embodiments, the material of the valve seat is not limited, and the valve seat material can be the same as the valve core material.

[0067] The following is combined Figure 1 and Figure 17The stopping structure of the valve core assembly 5 is explained below. Driven by an external coil, the rotor assembly 2 rotates inside the sleeve assembly 1. Through the threaded engagement with the lead screw 51 and the combined action of the sliding member 20 and the anti-rotation structure of the lead screw 51, the rotor assembly 2 drives the valve core 52 to move axially, thus realizing the valve's opening and closing action. When the valve is opened, the valve core 52 moves upward along the axis of the valve assembly. When the valve core assembly 5 rises to the top of the sleeve assembly 1, i.e., when the upper end face of the lead screw 51 contacts the inner end face of the sleeve assembly 1, an upper stop is achieved. When the valve is closed, the valve core 52 moves downward along the axis of the valve assembly to block the valve port, while the lower end face of the lead screw 51 contacts the valve seat, achieving a lower stop. It should be noted that, initially, the spring 54 has initial pre-compression. When the valve core 52 blocks the valve port, a certain amount of clearance H is reserved between the valve core 52 and the lead screw 51 to prevent jamming when closing the valve. After the valve core 52 seals the valve port, the lead screw 51 continues to move downwards, using the gap H to allow passage, thereby improving the sealing performance of the valve device. To improve the sealing effect, the gap H can be set between 0.1mm and 0.3mm, for example, 0.2mm. It can be seen that in this application, the stop structure of the valve core 52 is simple, reducing the phenomenon of valve jamming and reducing the wear of the valve core 52.

[0068] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention 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 invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A valve device, characterized by The valve device comprises a rotor assembly (2) and a valve seat (3), the rotor assembly (2) is provided with a clamping groove (200) in the circumferential direction; the valve seat (3) is provided with a containing cavity (30), and part of the rotor assembly (2) is accommodated in the containing cavity (30); the valve seat (3) is provided with a clamping hole (300), the clamping hole (300) has an opening (32) communicating with the containing cavity (30) on the wall forming the containing cavity (30); the valve device further comprises a stop piece (4), part of the stop piece (4) is located in the clamping groove (200), the rotor assembly (2) can rotate relative to the stop piece (4), and another part of the stop piece (4) is located in the clamping hole (300) to limit the axial movement of the stop piece (4) along the valve device.

2. The valve device of claim 1, wherein The stop piece (4) comprises a fixedly connected stop portion (40) and an anti-disengagement portion (50), the extension direction of the stop portion (40) is different from the extension direction of the anti-disengagement portion (50), at least part of the anti-disengagement portion (50) abuts against the valve seat (3), at least part of the stop portion (40) is located in the clamping groove (200), and another part of the stop portion (40) is located in the clamping hole (300), and the anti-disengagement portion (50) is adapted to limit the stop portion (40) from disengaging along the clamping hole (300).

3. The valve device of claim 2, wherein The stop portion (40) comprises a first stop portion (401) and a second stop portion (402), one end of the anti-disengagement portion (50) is connected to the first stop portion (401), the other end of the anti-disengagement portion (50) is connected to the second stop portion (402), the first stop portion (401) and the second stop portion (402) are located on the same side of the anti-disengagement portion (50), the contact area between the first stop portion (401) and the clamping groove (200) is defined as a first area, the contact area between the second stop portion (402) and the clamping groove (200) is defined as a second area, and the first area and the second area are symmetric about the center of the clamping groove (200).

4. The valve device of claim 3, wherein The wall of the containing cavity (30) is provided with a disengagement groove (34), the anti-disengagement portion (50) is in contact with at least part of the wall (340) forming the disengagement groove (34), and the projection of the outer contour of the anti-disengagement portion (50) on the cross section perpendicular to the axial direction of the valve device is located within the projection of the maximum outer contour of the valve seat (3).

5. The valve device of claim 4, wherein The shapes of the first stop portion (401) and the second stop portion (402) are both cylindrical segments, and the shape of the anti-disengagement portion (50) is a circular arc segment.

6. The valve apparatus of claim 1, wherein Part of the stop piece (4) abuts against the clamping groove (200), and another part of the stop piece abuts against at least part of the hole wall (33) of the clamping hole (300).

7. Valve device according to any of claims 1-6, characterized in that The friction coefficient between the stop piece (4) and the rotor assembly is less than or equal to 0.

06.

8. Valve device according to any of claims 1-6, characterized in that The sleeve assembly (1) is further included, the rotor assembly (2) further includes a sliding piece (20), the sliding piece (20) is circumferentially matched with the sleeve assembly (1), the sliding piece (20) is arranged at the end or the outer circumferential side of the rotor assembly (2), and the outer diameter size of the sliding piece (20) is greater than the outer diameter size of the rotor assembly (2).

9. The valve apparatus of claim 8, wherein The sliding piece (20) includes a first sliding bearing (201) and a second sliding bearing (202), and the first sliding bearing (201) is arranged at the upper end face of the rotor assembly (2) along the axial direction of the valve device, and the second sliding bearing (202) is arranged at the lower end face of the rotor assembly (2).

10. Valve device according to any of claims 1-6, characterized in that The valve core assembly (5) is further included, the valve core assembly (5) includes a transmission connected screw rod (51) and a valve core (52), the screw rod (51) is transmission connected with the rotor assembly (2), the screw rod (51) is provided with a mounting groove (80), and the large diameter part (520) of the valve core is clamped in the mounting groove (80), and the depth of the mounting groove (80) is greater than the height of the large diameter part (520).

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