Control valve and water treatment equipment

Abstract

The utility model discloses a control valve and water treatment equipment, and belongs to the technical field of water treatment.The control valve comprises a valve body, an end cover, a valve rod, a transmission assembly and a stepping motor, the valve body is provided with a valve cavity, and the valve cavity forms a mounting opening in the valve body; the end cover is connected with the valve body and covers the mounting opening; the valve rod penetrates through the end cover; the transmission assembly is connected to the side, away from the valve cavity, of the end cover and connected with the valve rod. The stepping motor is arranged on the side, away from the valve cavity, of the end cover and connected with the transmission assembly, and the stepping motor is used for driving the transmission assembly to drive the valve rod to move in the first direction. According to the control valve, the stepping motor is arranged to drive the transmission assembly, the rotation angle of the gear can be accurately controlled, so that the position of the piston is positioned, meanwhile, through the arrangement of the stepping motor, when the piston is stuck, speed reduction and torque increase can be achieved by reducing the frequency of a pulse signal, and the use reliability of the control valve is improved.

Description

Technical Field

[0001] This application belongs to the field of water treatment technology, specifically relating to control valves and water treatment equipment. Background Technology

[0002] In the control valve, a DC motor drives a gear to rotate, which in turn moves the valve stem. During the movement of the valve stem, a sensor can detect the rotation angle of the gear, thereby indirectly locating the position of the piston.

[0003] However, in actual use, the sensor is located in a small space, making it difficult to assemble into the transmission components, resulting in low assembly efficiency of the control valve. Utility Model Content

[0004] The purpose of this utility model is to provide a control valve and a water treatment device to solve the technical problem of low assembly efficiency of control valves due to the difficulty in assembling sensor components; another purpose of this application is to provide a water treatment device.

[0005] Technical solution: This application provides a control valve, including:

[0006] A valve body having a valve cavity, the valve cavity forming a mounting port in the valve body;

[0007] An end cap, which is connected to the valve body and seals the mounting port;

[0008] A valve stem, which passes through the end cap;

[0009] A transmission assembly is connected to the side of the end cover opposite to the valve cavity and is connected to the valve stem;

[0010] A stepper motor is disposed on the side of the end cover away from the valve cavity and connected to the transmission assembly. The stepper motor is used to drive the transmission assembly to move the valve stem along a first direction.

[0011] In some embodiments, the end cap includes a first body portion and a support portion, the first body portion being connected to the valve body and sealing the mounting port; the support portion being connected to the side of the first body portion away from the valve body;

[0012] The control valve further includes a bracket, which is connected to the support portion and spaced apart from the first body portion along the first direction to form a gap. At least a portion of the transmission assembly is disposed in the gap, the valve stem passes through the bracket, and the stepper motor is connected to the bracket.

[0013] In some embodiments, the stepper motor includes a fixed part and a rotating part connected to each other. The fixed part is connected to the side of the bracket away from the end cap along the first direction, and the rotating part passes through the bracket and is connected to the transmission assembly.

[0014] In some embodiments, the transmission assembly includes:

[0015] A fixing member is connected to the end cap. The fixing member has a first through hole that extends through the fixing member in a first direction. The valve stem passes through the first through hole. The fixing member includes a limiting part disposed in the first through hole, which is used to limit the rotation of the valve stem.

[0016] A first gear, at least a portion of which is connected to the fixing member on the side away from the end cap, a valve stem passing through the first gear, and the first gear being connected to the stepper motor, the stepper motor driving the first gear to rotate so as to move the valve stem along the first direction.

[0017] In some embodiments, the valve stem has a limiting surface, and the limiting portion is capable of contacting the limiting surface.

[0018] In some embodiments, the first gear includes:

[0019] A drive unit is connected to the side of the fixing member away from the end cap along the first direction, and the valve stem passes through the drive unit;

[0020] The main body is connected to the drive unit on the side near the end cap along the first direction.

[0021] In some embodiments, the first gear further includes a connecting portion disposed between the driving portion and the main body portion along the first direction, and connecting the driving portion and the main body portion respectively, and the connecting portion is sleeved on the fixing member.

[0022] In some embodiments, the fastener has a first groove facing the connecting portion and surrounding the fastener circumferentially.

[0023] The connecting portion has a second groove facing the fixing member and surrounding the fixing member circumferentially. The second groove and the first groove are arranged opposite to each other and form a receiving space.

[0024] The transmission assembly further includes a rolling element disposed in the receiving space and connected to the fixing element and the connecting portion respectively.

[0025] In some embodiments, the connecting portion has a receiving hole that extends through the connecting portion in a direction perpendicular to the first direction and communicates with the second groove; the transmission assembly further includes a sealing member disposed in the receiving hole and connected to the connecting portion.

[0026] In some embodiments, the end cap includes:

[0027] A first body portion, which is connected to the valve body and seals the mounting port;

[0028] The receiving part is disposed in the valve cavity and connected to the first body part. The receiving part has a receiving cavity and a second through hole that are interconnected. The second through hole is connected to the valve cavity. A portion of the transmission assembly is disposed in the receiving cavity, and the valve stem passes through the second through hole.

[0029] Accordingly, this application also provides a water treatment device, including a control valve as described in any of the above embodiments.

[0030] Beneficial Effects: Compared with the prior art, the control valve provided in this application includes a valve body, an end cap, a valve stem, a transmission assembly, and a stepper motor. The valve body has a valve cavity, and the valve cavity forms an installation port in the valve body. The end cap is connected to the valve body and seals the installation port. The valve stem passes through the end cap. The transmission assembly is connected to the side of the end cap away from the valve cavity and is connected to the valve stem. The stepper motor is located on the side of the end cap away from the valve cavity and is connected to the transmission assembly. The stepper motor is used to drive the transmission assembly to move the valve stem along a first direction. By setting a stepper motor to drive the transmission assembly, this application can accurately control the rotation angle of the gear, thereby positioning the piston. At the same time, by setting a stepper motor, this application can also reduce the speed and increase the torque by reducing the frequency of the pulse signal when the piston is stuck, thus improving the reliability of the control valve. Attached Figure Description

[0031] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0032] Figure 1 This is a schematic diagram of the structure of the control valve provided in an embodiment of this application;

[0033] Figure 2 for Figure 1 Detailed view of point A in the middle circle;

[0034] Figure 3 A cross-sectional view of a control valve provided in an embodiment of this application;

[0035] Figure 4 for Figure 3 Detailed view of point A in the middle circle;

[0036] Figure 5 This is a schematic diagram of the structure of the fixing component in the control valve provided in the embodiments of this application;

[0037] Figure 6 A schematic diagram of the fixing member in the control valve provided in an embodiment of this application from another angle;

[0038] Figure 7 This is a schematic diagram of the structure of the first gear in the control valve provided in the embodiments of this application;

[0039] Figure 8 A schematic diagram of the first gear in the control valve provided in an embodiment of this application at another angle;

[0040] Reference numerals in the attached drawings: 100-valve body, 110-valve cavity, 120-mounting port, 200-end cap, 210-first body part, 220-support part, 230-accommodating part, 231-accommodating cavity, 232-second through hole, 300-valve stem, 310-limiting surface, 400-transmission assembly, 410-fixing part, 411-first through hole, 412-limiting part, 413-first groove, 414-second body part, 420-first gear, 421-drive part, 422-main body part, 423-connecting part, 424-second groove, 425-accommodating space, 426-accommodating hole, 430-second gear, 440-sealing part, 450-rolling part, 500-stepper motor, 510-fixing part, 520-rotating part, 600-bracket, 610-gap. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" 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, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically limited. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0043] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure of this application, the components and arrangements of specific examples are described below. Of course, these are merely examples and are not intended to limit this application.

[0044] The DC motor in the control valve drives the gear to rotate, thereby moving the valve stem 300. During the movement of the valve stem 300, the sensor can sense the rotation angle of the gear, thereby indirectly locating the position of the piston.

[0045] However, in actual use, the sensor is located in a small space, making it difficult to assemble into the transmission assembly 400, resulting in low assembly efficiency of the control valve.

[0046] To address the technical problem of low assembly efficiency of the control valve due to the difficulty in assembling the aforementioned sensor components into the transmission assembly 400, the first embodiment of this application provides a control valve. Please refer to... Figure 1 The control valve includes a valve body 100, an end cap 200, a valve stem 300, a transmission assembly 400, and a stepper motor 500. The valve body 100 has a valve cavity 110, and the valve cavity 110 forms an installation port 120 in the valve body 100. The end cap 200 is connected to the valve body 100 and covers the installation port 120. The valve stem 300 passes through the end cap 200. The transmission assembly 400 is connected to the side of the end cap 200 away from the valve cavity 110 and is connected to the valve stem 300. The stepper motor 500 is disposed on the side of the end cap 200 away from the valve cavity 110 and is connected to the transmission assembly 400. The stepper motor 500 is used to drive the transmission assembly 400 to move the valve stem 300 along a first direction X.

[0047] Specifically, the control valve also includes a piston disposed in the valve chamber 110 and used to open or close the water passage communicating with the valve chamber 110. The piston is connected to the valve stem 300, and the valve stem 300 moves along the first direction X to drive the piston to move along the first direction X.

[0048] Specifically, the valve stem 300 passes through the end cover 200. The part of the valve stem 300 located inside the valve cavity 110 is connected to the piston, and the part of the valve stem 300 located outside the valve cavity 110 is connected to the transmission assembly 400.

[0049] Specifically, the first direction X is the direction of arrow X in the attached diagram.

[0050] During the use of the control valve, the stepper motor 500 is connected to the controller and driver to obtain pulse signals for setting parameters such as direction, speed, and angle.

[0051] In the above embodiment, a stepper motor 500 drives the transmission assembly 400. The rotation angle of the rotating part 520 in the stepper motor 500 can be determined based on the number of pulse signals. Then, the rotation angle of the transmission assembly 400 and the position of the valve stem 300 are calculated sequentially. This achieves precise positioning of the valve stem 300 without the need for sensor components, reducing the assembly difficulty of the control valve and improving its assembly efficiency. Furthermore, because the stepper motor 500 reduces the frequency of the pulse signals to decrease the rotational speed of the rotating part 520, it can reduce speed and increase torque when the piston is stuck, allowing the piston to continue moving and the control valve to continue operating, thus improving the reliability of the control valve.

[0052] Specifically, determine the step angle θ0 of the stepper motor 500, the number of pulse signals x, the transmission ratio i1 of the transmission assembly 400, and the lead d of the valve stem 300;

[0053] The distance D that the valve stem 300 moves is determined by the following formula:

[0054]

[0055] The position of valve stem 300 can be determined based on its initial position and the distance D it has moved.

[0056] In some embodiments, please refer to Figure 1 and Figure 3The end cap 200 includes a first body portion 210 and a support portion 220. The first body portion 210 is connected to the valve body 100 and covers the mounting port 120. The support portion 220 is connected to the side of the first body portion 210 away from the valve body 100. The control valve also includes a bracket 600, which is connected to the support portion 220 and is spaced apart from the first body portion 210 along the first direction X, forming a gap 610. At least a portion of the transmission assembly 400 is disposed in the gap 610. The valve stem 300 passes through the bracket 600, and the stepper motor 500 is connected to the bracket 600.

[0057] In the above embodiment, the bracket 600 provides support for the stepper motor 500, facilitating the installation of the stepper motor 500 and the control valve. Simultaneously, at least a portion of the transmission assembly 400 is disposed within the gap 610 formed by the bracket 600 and the first body portion 210, allowing the bracket 600 to partially cover and protect the transmission assembly 400, thereby improving the reliability of the control valve.

[0058] In some embodiments, please refer to Figure 3 The stepper motor 500 includes a fixed part 510 and a rotating part 520 connected to each other. The fixed part 510 is connected to the side of the bracket 600 away from the end cover 200 along the first direction X. The rotating part 520 passes through the bracket 600 and is connected to the transmission assembly 400.

[0059] In the above embodiment, the stepper motor 500 is connected to the side of the bracket 600 away from the end cover 200, which allows the bracket 600 to be closer to the transmission component 400 along the first direction X, thereby enhancing the protective effect of the bracket 600 on the transmission component 400.

[0060] In some embodiments, please refer to Figure 3 and Figure 4 The transmission assembly 400 includes a fixing member 410 and a first gear 420. The fixing member 410 is connected to the end cover 200. The fixing member 410 has a first through hole 411 that extends through the fixing member 410 along a first direction X. The valve stem 300 passes through the first through hole 411. The fixing member 410 includes a limiting part 412 disposed in the first through hole 411. The limiting part 412 is used to limit the rotation of the valve stem 300. At least a portion of the first gear 420 is connected to the side of the fixing member 410 away from the end cover 200. The valve stem 300 passes through the first gear 420, and the first gear 420 is connected to a stepper motor 500. The stepper motor 500 drives the first gear 420 to rotate so as to move the valve stem 300 along the first direction X.

[0061] Specifically, the valve stem 300 has an external thread, and the first gear 420 has an internal thread that can be threaded into the external thread of the valve stem 300.

[0062] In some embodiments, the fixing member 410 includes a second body portion 414 and a limiting portion 412 connected to each other. The second body portion 414 has a first through hole 411. The limiting portion 412 is disposed in the first through hole 411 and connected to the hole wall of the first through hole 411. The limiting portion 412 is used to restrict the valve stem 300 from rotating with the first gear 420.

[0063] In the above embodiment, when the first gear 420 rotates, the limiting portion 412 of the fixing member 410 can prevent the valve stem 300 from rotating with the first gear 420, thereby allowing the first gear 420 to rotate around and relative to the valve stem 300. When the first gear 420 rotates relative to the valve stem 300, since a portion of the first gear 420 along the first direction X is located between the end cover 200 and the bracket 600, the first gear 420 is limited along the first direction X, and the valve stem 300 can therefore move along the first direction X to drive the piston to move. The fixing member 410 serves to limit the rotation of the valve stem 300 and also to limit the first gear 420 along the first direction X.

[0064] In some embodiments, the transmission assembly 400 further includes a second gear 430 that meshes with the first gear 420. The rotating part 520 of the stepper motor 500 is connected to the second gear 430 and can drive the second gear 430 to rotate, thereby driving the first gear 420 to rotate.

[0065] In some embodiments, the number of teeth of the second gear 430 is less than the number of teeth of the first gear 420. The first gear 420 and the second gear 430 form a reduction gear set with the first gear 420 as the driven gear and the second gear 430 as the driving gear, so as to increase the output torque of the first gear 420, making the movement of the valve stem 300 smoother and improving the reliability of the control valve.

[0066] In some embodiments, please refer to Figure 2 The valve stem 300 has a limiting surface 310, and the limiting part 412 faces the limiting surface 310 and can contact the limiting surface 310.

[0067] Specifically, the valve stem 300 has an axis and a radius. Along a direction perpendicular to the first direction X, the minimum distance between the limiting surface 310 and the axis is less than the radius of the valve stem 300.

[0068] In some embodiments, please refer to Figure 5 The fixing member 410 has two limiting parts 412, which are spaced apart in a direction perpendicular to the first direction X; the valve stem 300 has two limiting surfaces 310 that are opposite to each other in a direction perpendicular to the first direction X.

[0069] In some embodiments, please refer to Figure 7and Figure 8 The first gear 420 includes a drive part 421 and a main body 422. The drive part 421 is connected to the side of the fixing member 410 away from the end cover 200 along the first direction X. The valve stem 300 passes through the drive part 421, and the drive part 421 passes through the bracket 600. The main body 422 is connected to the side of the drive part 421 near the end cover 200 along the first direction X. The main body 422 is connected to the stepper motor 500.

[0070] In some embodiments, the main body 422 meshes with the second gear 430.

[0071] In some embodiments, an internal thread is provided on the drive portion 421, and the drive portion 421 is threadedly connected to the valve stem 300.

[0072] Specifically, the bracket 600 has a mounting hole, the drive part 421 passes through the mounting hole and is spaced apart from the bracket 600 in a direction perpendicular to the first direction X.

[0073] In some embodiments, at least a portion of the drive portion 421 is exposed in the mounting hole.

[0074] In some embodiments, the entire drive portion 421 is exposed within the mounting hole; in other embodiments, a portion of the drive portion 421 is exposed within the mounting hole.

[0075] In the above embodiment, by connecting the main body 422 to the side of the drive unit 421 near the end cover 200 along the first direction X, and by having the drive unit 421 pass through the end cover 200, the bracket 600 can be as close as possible to the main body 422 to protect the main body 422 and limit the main body 422 along the first direction X, thereby improving the reliability of the control valve.

[0076] In some embodiments, please refer again Figure 7 and Figure 8 The first gear 420 also includes a connecting part 423, which is disposed between the driving part 421 and the main body part 422 along the first direction X, and connects the driving part 421 and the main body part 422 respectively. The connecting part 423 is sleeved on the fixing member 410.

[0077] In the above embodiment, by providing the connecting part 423, the main body part 422 can be closer to the end cover 200 along the first direction X, thereby enabling the bracket 600 to also be closer to the end cover 200 along the first direction X, thereby reducing the size of the gap 610 in the first direction X, improving the protective effect of the bracket 600 on the first gear 420, and thus improving the reliability of the control valve.

[0078] In some embodiments, please refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The fixing member 410 has a first groove 413 facing the connecting portion 423 and surrounding the fixing member 410 circumferentially; the connecting portion 423 has a second groove 424 facing the fixing member 410 and surrounding the fixing member 410 circumferentially, the second groove 424 and the first groove 413 are arranged opposite to each other and form a receiving space 425; the transmission assembly 400 also includes a rolling member 450, which is disposed in the receiving space 425 and connects the fixing member 410 and the connecting portion 423 respectively.

[0079] In the above embodiment, by providing a rolling element 450 within the receiving space 425 formed by the first groove 413 and the second groove 424, the interactive friction between the connecting part 423 and the fixing member 410 is converted into rolling friction, thereby making the rotation of the first gear 420 smoother, and thus making the operation of the control valve smoother. The first groove 413 and the second groove 424 are used to limit the rolling element 450, restricting the rolling element 450 to rolling only within the receiving space 425.

[0080] In some embodiments, please refer to Figure 4 The connecting part 423 has a receiving hole 426, which extends through the connecting part 423 in a direction perpendicular to the first direction X and communicates with the second groove 424; the transmission assembly 400 also includes a sealing member 440, which is disposed in the receiving hole 426 and connected to the connecting part 423.

[0081] In the above embodiment, by providing a receiving hole 426, after the first gear 420 is fitted onto the fixing member 410, the rolling member 450 is inserted into the receiving cavity 231, thereby placing the rolling member 450 into the receiving space 425. Furthermore, providing a sealing member 440 that blocks the receiving hole 426 can prevent the rolling member 450 from being lost, improving the reliability of the control valve.

[0082] In some embodiments, please refer to Figure 3 The end cap 200 includes a first body portion 210 and a receiving portion 230. The first body portion 210 is connected to the valve body 100 and covers the mounting port 120. The receiving portion 230 is disposed in the valve cavity 110 and is connected to the first body portion 210. The receiving portion 230 has a receiving cavity 231 and a second through hole 232 that are interconnected. The second through hole 232 is connected to the valve cavity 110. A portion of the transmission assembly 400 is disposed in the receiving cavity 231, and the valve stem 300 passes through the second through hole 232.

[0083] In the above embodiment, by placing the fixing member 410 inside the receiving cavity 231, the maximum size of the control valve along the first direction X, that is, the outer size of the control valve in the first direction X, is reduced, making the structure of the control valve more compact and the volume smaller.

[0084] In some embodiments, the fastener 410 is threadedly connected to the receiving portion 230 to reduce the difficulty of connecting the fastener 410 and the end cap 200.

[0085] In some embodiments, a sealing element is also provided in the second through hole 232. The sealing element is sleeved on the valve stem 300 and seals the valve stem 300 and the receiving portion 230 to prevent liquid from flowing out of the valve cavity 110 through the gap 610 between the valve stem 300 and the receiving portion 230 when the valve stem 300 moves in the first direction X.

[0086] In some embodiments, the valve stem 300 includes an engaging portion and a plug-in portion. The engaging portion has a plug-in hole, and the plug-in portion is inserted into the plug-in hole. The engaging portion has an external thread that engages with the drive portion 421, and a limiting surface 310 is located in the engaging portion. The end of the plug-in portion away from the engaging portion along the first direction X is connected to the piston.

[0087] The valve stem 300 is divided into an engagement portion having an external thread and a limiting surface 310, and an insertion portion inserted into the engagement portion, thereby reducing the machining difficulty of the valve stem 300. In some embodiments, the engagement portion is an injection molded part, and the external thread and the limiting surface 310 can be directly formed by injection molding, reducing the number of subsequent processing steps and lowering the manufacturing difficulty of the control valve.

[0088] Accordingly, this application also provides a water treatment device, including a control valve as described in any of the above embodiments.

[0089] The control valve and water treatment equipment provided in the embodiments of this application have been described in detail above. Specific examples have been used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A control valve, characterized in that, include: A valve body (100) having a valve cavity (110) forming a mounting port (120) in the valve body (100); End cap (200), the end cap (200) is connected to the valve body (100) and covers the mounting port (120); A valve stem (300) passes through the end cap (200); A transmission assembly (400) is connected to the side of the end cap (200) away from the valve chamber (110) and is connected to the valve stem (300); A stepper motor (500) is disposed on the side of the end cover (200) away from the valve chamber (110) and connected to the transmission assembly (400). The stepper motor (500) is used to drive the transmission assembly (400) to move the valve stem (300) along a first direction (X).

2. The control valve according to claim 1, characterized in that, The end cap (200) includes a first body part (210) and a support part (220). The first body part (210) is connected to the valve body (100) and covers the mounting port (120). The support part (220) is connected to the side of the first body part (210) away from the valve body (100). The control valve further includes a bracket (600), which is connected to the support portion (220) and is spaced apart from the first body portion (210) along the first direction (X) to form a gap (610). At least a portion of the transmission assembly (400) is disposed in the gap (610), the valve stem (300) passes through the bracket (600), and the stepper motor (500) is connected to the bracket (600).

3. The control valve according to claim 2, characterized in that, The stepper motor (500) includes a fixed part (510) and a rotating part (520) connected to each other. The fixed part (510) is connected to the side of the bracket (600) away from the end cap (200) along the first direction (X). The rotating part (520) passes through the bracket (600) and is connected to the transmission assembly (400).

4. The control valve according to claim 1, characterized in that, The transmission assembly (400) includes: A fixing member (410) is connected to the end cap (200). The fixing member (410) has a first through hole (411) extending through the fixing member (410) in a first direction (X). The valve stem (300) passes through the first through hole (411). The fixing member (410) includes a limiting part (412) disposed in the first through hole (411). The limiting part (412) is used to limit the rotation of the valve stem (300). A first gear (420) is connected at least partly to the fixing member (410), the valve stem (300) passes through the first gear (420), and the first gear (420) is connected to the stepper motor (500), the stepper motor (500) drives the first gear (420) to rotate so as to move the valve stem (300) along the first direction (X).

5. The control valve according to claim 4, characterized in that, The valve stem (300) has a limiting surface (310), and the limiting part (412) is able to contact the limiting surface (310).

6. The control valve according to claim 5, characterized in that, The first gear (420) includes: A drive unit (421) is connected to the side of the fixing member (410) away from the end cap (200) along the first direction (X), and the valve stem (300) passes through the drive unit (421); The main body (422) is connected to the drive unit (421) on the side near the end cover (200) along the first direction (X), and the main body (422) is connected to the stepper motor (500).

7. The control valve according to claim 6, characterized in that, The first gear (420) further includes a connecting part (423), which is disposed between the driving part (421) and the main body part (422) along the first direction (X) and connects the driving part (421) and the main body part (422) respectively. The connecting part (423) is sleeved on the fixing member (410).

8. The control valve according to claim 7, characterized in that, The fastener (410) has a first groove (413) facing the connecting portion (423) and the first groove (413) surrounds the fastener (410) circumferentially. The connecting part (423) has a second groove (424) facing the fixing member (410) and surrounding the fixing member (410) circumferentially. The second groove (424) and the first groove (413) are arranged opposite to each other and form a receiving space (425). The transmission assembly (400) further includes a rolling element (450), which is disposed in the receiving space (425) and is connected to the fixing element (410) and the connecting part (423) respectively.

9. The control valve according to claim 8, characterized in that, The connecting part (423) has a receiving hole (426) that extends through the connecting part (423) in a direction perpendicular to the first direction (X) and communicates with the second groove (424); the transmission assembly (400) further includes a sealing member (440) that is disposed in the receiving hole (426) and connected to the connecting part (423).

10. The control valve according to claim 1, characterized in that, The end cap (200) includes: A first body part (210) is connected to the valve body (100) and covers the mounting port (120); A receiving portion (230) is disposed in the valve cavity (110) and connected to the first body portion (210). The receiving portion (230) has a receiving cavity (231) and a second through hole (232) that are interconnected. The second through hole (232) is connected to the valve cavity (110). A portion of the transmission assembly (400) is disposed in the receiving cavity (231), and the valve stem (300) passes through the second through hole (232).

11. A water treatment device, characterized in that, Includes the control valve as described in any one of claims 1-10.

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