Control valve

Abstract

A control valve (1) comprising a valve body (10), a valve element (20), a sealing member (41) and a balance sealing block (42), the control valve (1) comprising at least five passages (30), a side wall portion (11) having at least five communication ports, the communication ports communicating with a valve chamber (101), a sealing body portion (410) of the sealing member (41) being located between the valve element (20) and the side wall portion (11), the sealing body portion (410) having through holes penetrating the sealing member (41), the number of communication ports in a region of the side wall portion (11) contacting the sealing body portion (410) being the same as the number of the through holes and communicating correspondingly, The ring block (42) is located between the side wall portion (11) and the valve body (20) and is in contact with the valve body (20). The balance sealing block (42) and the sealing member (41) are provided on both radial sides of the valve body (20). The surface of the balance sealing block (42) facing the valve body (20) is an arcuate surface. The axis of the arcuate surface of the balance sealing block (42) overlaps with the axis of the inner surface of the sealing body portion (410) and the radii of both are equal. The valve body (20) and the side wall portion (11) are arranged coaxially. This makes it possible to control fluids in multiple flow paths and improve the sealing performance of the control valve.

Description

[Technical field]

[0001] This application claims priority to a Chinese patent application filed with the China Patent Office on April 16, 2021, bearing application number 202110411378.0, and entitled "Control Valve", the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of fluid control, and in particular to control valves. [Background technology]

[0003] Fluid control systems may use multi-passage control valves to control the flow paths. In order to realize control of fluids in a plurality of flow paths of a control valve, a plurality of flow paths are arranged in the control valve, and the plurality of flow paths require sealing members for sealing. The problem to be solved is how to arrange the multiple flow paths and sealing members in order to improve the stability of control over the multiple flow paths and the sealing performance of the control valve. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a control valve which can improve the stability of control over fluids in a plurality of flow paths and can also improve the sealing performance of the control valve. [Means for solving the problem]

[0005] The present invention provides a control valve, comprising a valve body, a valve element, and a sealing member, the valve body including a side wall portion, the control valve having a valve chamber, the side wall portion being a peripheral wall or at least a part of a peripheral wall of the valve chamber, at least a part of the valve element and the sealing member being both located in the valve chamber, The sealing member includes a sealing body, and the sealing body is located between the valve body and the side wall along a radial direction of the valve body, and the sealing body has an inner surface that contacts the valve body and an outer surface that contacts the side wall, The control valve further includes a balance sealing block, which is located between the side wall portion and the valve body along the radial direction of the valve body and contacts the valve body, the balance sealing block and the sealing member are arranged along the circumferential direction of the valve body, and the acting force or component force of the balance sealing block on the valve body is opposite to the acting force or component force of the sealing member on the valve body. Effect of the Invention

[0006] The control valve of the present invention includes a sealing member and a balance sealing block, the cross section of which is an arc-shaped structure, and the sealing member of the present invention has a larger expansion space and lower manufacturing precision than a sealing member having a cross section of an annular structure. The balance sealing block is located between the side wall and the valve body, and the balance sealing block and the sealing member are arranged along the circumferential direction of the valve body. When the valve body presses the sealing member and the balance sealing block, the acting force or component of the balance sealing block on the valve body is opposite to the acting force or component of the sealing member on the valve body, so as to keep the valve body and the side wall coaxially, thereby improving the stability of the rotation of the valve body and preventing fluid leakage caused by sealing deviation due to eccentricity of the valve body, and improving the sealing performance of the control valve and the stability of the control valve's control of the fluid. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is an exploded view of a control valve according to an embodiment of the present invention. [Diagram 2] 2 is a partial cross-sectional view of the control valve of FIG. 1 in one position. [Diagram 3] 2 is a partial cross-sectional view of the control valve of FIG. 1 in another position. [Figure 4]FIG. 2 is a structural diagram of a valve body according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a partial cross-sectional view of a combined structure of a valve body and a sealing member in an embodiment of the present invention at one position. [Figure 6] FIG. 2 is a structural diagram of a sealing member according to an embodiment of the present invention. [Figure 7] 7 is a partial cross-sectional view of the sealing member and valve body of FIG. 6 engaged. FIG. [Figure 8] FIG. 2 is a front view of a portion of the structure of the control valve of FIG. [Figure 9] 9 is a cross-sectional view taken along the line AA in FIG. 8. [Figure 10] FIG. 10 is an enlarged view of position Q1 in FIG. [Figure 11] FIG. 6 is a structural diagram of a valve body according to another embodiment of the present invention. [Figure 12] FIG. 2 is a structural diagram of a balance sealing block according to an embodiment of the present invention. [Figure 13] 4 is a partial cross-sectional view of a combined structure of a valve body and a sealing member in an embodiment of the present invention at another position. FIG. [Figure 14] FIG. 4 is a structural diagram of a valve body in an embodiment of the present invention. [Figure 15] FIG. 15 is a cross-sectional view of the valve body in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present invention will now be described in more detail with reference to the following figures and examples. In this specification, relational terms such as "first" and "second" do not require or imply that any such actual relationship or order exists between those elements, but rather are used merely to distinguish between two elements having the same name.

[0009] As shown in FIGS. 1 to 3, an embodiment of the present invention provides a control valve 1, which includes a valve body 10, a valve element 20 and a sealing member 41. The valve body 10 includes a side wall portion 11, the control valve 1 has a valve chamber 101, the side wall portion 11 is a peripheral wall or at least a part of the peripheral wall of the valve chamber 101, at least a part of the valve element 20 is located in the valve chamber 101, the valve element 20 is rotatable by driving, and the control valve 1 further includes a driving device 50 and a sealing ring 43. The drive unit 50 includes a drive member, which may be a motor or a motor plus a reduction gear group, the valve body 20 can be rotated by driving the drive member in the drive unit 50, and at least a part of the sealing member 41 is located between the valve body 20 and the side wall portion 11. In FIG. 1, the valve body 10 further includes a bottom wall portion 12 and a top wall portion 13. These bottom wall portion 12, top wall portion 13 and side wall portion 11 form a valve chamber 101 to be surrounded, and a sealing ring 43 is located between the top wall portion 13 and the valve body 20, and at least a part of the side wall portion 11 is located between the bottom wall portion 12 and the top wall portion 13, with one of the bottom wall portion 12 and the top wall portion 13 being integrally molded with the side wall portion 11 and the other being arranged so as to be sealed to the side wall portion 11. For example, in FIG. 1, the top wall portion 13 is integrally formed with the side wall portion 11, and the bottom wall portion 12 is fixedly connected to the side wall portion 11 by a welding process and arranged to be sealed, thereby preventing fluid leakage, and the sealing ring 43 is located between the top wall portion 13 and the valve body 20. In this case, during the assembly process of the valve body 20, it is assembled from the bottom of the valve body 10 toward the ceiling, thereby reducing the deformation of the sealing ring 43 and improving the sealing performance of the sealing ring 43. The control valve 1 includes at least five passages 30, and the side wall portion 11 has at least five communication ports which communicate with the valve chamber 101. One end of each passage 30 penetrates the side wall portion 11 to form a communication port, and the other end forms a valve port 102 of the control valve 1, and fluid can enter and exit the control valve 1 from the valve port 102. The number of passages 30 included in this control valve 1 can be set according to the needs of the user, and may be, for example, three, four, five, or six.

[0010] In order to easily assemble the control valve 1 with other components in the fluid control system and to improve the degree of integration between the control valve 1 and other components, as shown in Figures 1 to 3, the valve body 10 further includes a mounting portion 14. The attachment portion 14 is fixedly connected to the side wall portion 11 and is located on the side of the side wall portion 11 away from the valve chamber 101. For example, the mounting portion 14 is integrally molded with the side wall portion 11 and has a mounting surface 141. The valve ports 102 of the control valve 1 penetrate the mounting surface 141, so that the valve ports 102 of the control valve 1 are all positioned on the mounting surface 141 and are oriented in the same direction. This simplifies the assembly steps between the control valve 1 and other components, reduces leak points at the connections, and improves the reliability of sealing.

[0011] The sealing member 41 has an arc-shaped cross section along a direction perpendicular to the height direction of the sealing member 41 , and includes a sealing body 410 . This sealing main body 410 is located between the valve body 20 and the side wall 11, the inner surface of the sealing main body 410 contacts the valve body 20 and its outer surface contacts the side wall 11, and the communication port within the area of ​​the side wall 11 that contacts the sealing main body 410 is defined as the first communication port 311, and in this case, the communication port of the side wall 11 includes the first communication port 311. The valve ports 102 communicating with the first communication ports 311 are arranged in an array along the height direction of the side wall portion 11 and a direction perpendicular to the height direction of the side wall portion 11. As shown in FIG. 2, the contour of the mounting surface 141 of the mounting portion 14 is an approximately rectangular structure, and the longitudinal direction of this mounting surface 141 is parallel to the height direction of the side wall portion 11. In this case, the valve ports 102 communicating with the first communication port 311 are arranged in an array along the longitudinal and transverse directions of the mounting surface 141.

[0012] As shown in Figures 2 to 4, the first communication ports 311 are arranged along the height direction and circumferential direction of the side wall portion 11, and two rows of the first communication ports 311 are arranged in the side wall portion 11 along the circumferential direction of the side wall portion 11. As shown in Figures 2 and 4, in this embodiment, the side wall portion 11 has eight first communication ports 311, and along the height direction of the side wall portion 11, the side wall portion 11 has four rows of the first communication ports 311, each row has two first communication ports 311, and correspondingly, the control valve 1 has eight first valve ports 312 that correspond to and communicate with the first communication ports 311 respectively. As shown in Figures 3, 5 to 7, when the sealing member 41 includes a sealing main body 410, the sealing main body 410 has through holes 411 penetrating the sealing member 41, the through holes 411 are the same in number as the first communication ports 311 and are communicated with each other in a corresponding manner, the through holes 411 are arranged along the height direction of the sealing member 41 and the circumferential direction of the sealing main body 410, and two through holes 411 are arranged in the sealing main body 410 along the circumferential direction of the sealing main body 410. In this embodiment, the sealing body 410 has eight through holes 411, and along the height direction of the sealing body 410, the sealing body 410 has four rows of through holes 411, each row has two through holes 411, and the inner surface of the sealing body 410 is an arc surface. This arc surface contacts the valve body 20, and the corresponding central angle of the arc surface of the sealing main body portion 410 is defined as α, where α is greater than the central angle corresponding to the edges of the two communication ports arranged along the circumferential direction of the side wall portion 11, and preferably α is greater than or equal to 100° and less than 180°, and preferably α is greater than or equal to 100° and less than 110°. With the above arrangement, the difficulty of manufacturing the manufacturing mold for the sealing member 41 can be reduced, the difficulty of manufacturing the sealing member 41 can be reduced, and the manufacturing cost of the sealing member 41 can be reduced.

[0013] As shown in FIG. 7, in a cross section perpendicular to the height direction of the side wall portion 11, the maximum central angle formed by the edges of the two first communication ports 311 arranged along the circumferential direction and the center of the side wall portion 11 is defined as β, where β=90°. Correspondingly, in a cross section perpendicular to the height direction of the sealing member 41, the maximum central angle formed by the edges of the two through holes 411 of the sealing member 41 and the center of the arc surface of the sealing member 41 is 90°. During the operation of the control valve 1, due to the control accuracy of the driving member, or the delay in signal transmission, or the influence of the rotational inertia of the valve body 20, the valve body 20 has a rotation tolerance, and the angle of the rotation tolerance is defined as θ, where α≧β+2θ. Preferably, the rotation tolerance angle of the valve body 20 may be ±5°, and when the driving member stops the rotation of the driving valve body 20, due to the influence of the control accuracy of the driving member, or the delay in signal transmission, or the rotational inertia of the valve body 20, the valve body 20 stops when it rotates to 5° before the specified angle, or continues to rotate 5° after exceeding the specified angle. Therefore, the valve body 20 has a rotation tolerance, and the sealing member 41 is always in contact with the valve body 20 within each stroke range of the rotation of the valve body 20. In order to provide the sealing member 41 with good sealing performance, a large expansion space and low manufacturing difficulty, the corresponding central angle α of the arc surface of the sealing body 410 is set to 100°.

[0014] In order to stably limit the position of the sealing member 41 within the valve chamber 101 of the valve body 10, the sealing member 41 further includes position limiting portions 414 at both circumferential ends of the sealing main body portion 410, as shown in FIGS. The position limiting portion 414 has a position limiting surface 4141 , which is connected between the inner surface and the outer surface of the sealing member 41 , and the valve body 10 further includes a stopper portion 15 . As shown in Figures 9 and 10, the stopper portion 15 is a part of the side wall portion 11, or as shown in Figure 11, the stopper portion 15 is fixedly connected to the side wall portion 11 and is located within the valve chamber 101, and the stopper portion 15 has a stopper surface 151. This stopper surface 151 extends along the radial direction of the side wall portion 11 or extends at an angle to the radial direction, the stopper surface 151 is located in the valve chamber 101, and the position limiting surface 4141 and the stopper surface 151 are arranged so as to be in contact with each other. With the above arrangement, the position limiting surface 4141 and the stopper surface 151 engage with each other to prevent the sealing member 41 from rotating, thereby improving the sealing performance of the sealing member 41.

[0015] Since the cross section of the sealing member 41 has an arc-shaped structure, there is a risk that the valve body 20 may become eccentric in the process of pressing the sealing member 41 . Referring to FIG. 9, the control valve 1 further includes a balance sealing block 42. This balance sealing block 42 is located between the side wall portion 11 and the valve body 20, and the balance sealing block 42 and the sealing member 41 are provided on both radial sides of the valve body 20, and the surface of the balance sealing block 42 facing the valve body 20 is an arcuate surface, and the axis of the arcuate surface of the balance sealing block 42 overlaps with the axis of the inner surface of the sealing main body portion 410, and the radii of both are equal, and preferably the height of the balance sealing block 42 may be equal to the height of the sealing member 41. Along the height direction of the valve body 20, the contact height between the sealing member 41 and the valve body 20 is equal to the contact height between the balance sealing block 42 and the valve body 20. With the above arrangement, the balance sealing block 42 and the sealing member 41 generate an acting force of the same magnitude and opposite direction on the valve body 20, thereby holding the valve body 20 and the side wall portion 11 coaxially, improving the stability of the rotation of the valve body 20, preventing fluid leakage due to eccentricity of the valve body 20, and improving the sealing performance of the control valve 1 and the stability of the control of the fluid by the control valve 1.

[0016] In order to stably rotate the valve body 20 with a small driving force, as shown in Figs. 5 to 7, the sealing member 41 includes a first elastic pad 412 and a first sealing member 413 which are fixedly connected to each other. The first elastic pad 412 is located between the first sealing member 413 and the side wall portion 11, and the first sealing member 413 is located between the first elastic pad 412 and the valve body 20 and in contact with the valve body 20, and its main material may be Teflon. For example, the first sealing member 413 is processed from Teflon, the first elastic pad 412 is processed from rubber, and the first elastic pad 412 and the first sealing member 413 are bonded together to be fixed as an integral structure. In this case, the surface roughness of the first sealing member 413 facing the valve body 20 is smaller than that of the first elastic pad 412 facing away from the valve body 20. The main material of the first sealing member 413 is made of Teflon, so that the first sealing member 413 can exert a sealing function and also has a certain lubricating performance, thereby reducing the friction force between the valve body 20 and the sealing member 41, and further reducing the driving force of the control valve 1. The first elastic pad 412 includes a body portion and a protrusion portion, the protrusion portion being in contact with the side wall portion 11 and including a plurality of intersecting axial and circumferential protrusion portions. The axial protrusion extends along the height direction of the first elastic pad 412, and the circumferential protrusion extends along the circumferential direction of the first elastic pad 412. By arranging multiple protrusions, the amount of compressive deformation of the sealing member 41 is increased, thereby improving the sealing performance of the sealing member 41.

[0017] Based on this, as shown in FIGS. 9 and 12, the balance sealing block 42 includes a second elastic pad 423 and a second sealing member 424 that are fixedly connected to each other. The second elastic pad 423 is located between the second sealing member 424 and the side wall portion 11, and the second sealing member 424 is located between the second elastic pad 423 and the valve body 20 and contacts the valve body 20, and the main material of the second sealing member 424 may be Teflon. For example, the second sealing member 424 is formed by processing Teflon, the second elastic pad 423 is formed by processing rubber, and the second elastic pad 423 and the second sealing member 424 are fixed together as an integral structure by being bonded together. In this case, the surface roughness of the second sealing member 424 facing the valve body 20 is smaller than that of the surface of the second elastic pad 423 facing away from the valve body 20. By configuring the main material of the second sealing member 424 to be Teflon, the second sealing member 424 can perform a sealing function and also have a certain lubricating performance, thereby reducing the frictional force between the valve body 20 and the sealing member 41, and further reducing the driving force of the control valve 1.

[0018] In order to stably restrict the position of the balance sealing block 42 within the valve chamber 101, as shown in Figures 9 to 12, the valve body 10 has an accommodating chamber 152 and an opening 153 along the radial direction of the side wall portion 11, the accommodating chamber 152 communicates with the valve chamber 101 via the opening 153, and the cross-sectional area of ​​the accommodating chamber 152 is larger than the cross-sectional area of ​​the opening 153, and the balance sealing block 42 includes a first part 421 and a second part 422 that are fixedly connected to each other. The cross-sectional area of ​​the first part 421 is larger than the cross-sectional area of ​​the second part 422, the first part 421 is located in the accommodation chamber 152, and the second part 422 is located between the valve body 20 and the first part 421, and in this case, the second part 42 contacts the valve body 20 through the opening 1532. Here, the cross section is a cross section obtained by cutting the control valve 1 along a direction perpendicular to the height direction of the balance sealing block 42 or along a direction perpendicular to the height direction of the side wall portion 11. The above arrangement allows the balance sealing block 42 to be restricted in position within the receiving chamber 152, facilitating installation of the balance sealing block 42. And when this balance sealing block 42 includes a second elastic pad 423 and a second sealing member 424, the first part 421 may be the second elastic pad 423 and the second part 422 may be the second sealing member 424, or the first part 421 may be a structure formed from the second elastic pad 423 and a part of the second sealing member 424 and the second part 422 may be a structure formed from another part of the second sealing member 424.

[0019] 1 to 3, 9 and 13 to 15, the communication openings of the side wall portion 11 further include a second communication opening 321. As shown in FIG. This second communication port 321 is located at one end in the height direction of the side wall portion 11 and is arranged away from the sealing member 41, and the valve body 20 has a columnar structure and includes a top plate 201, a bottom plate 202, an internal conductive chamber 21, a plurality of external conductive chambers 22, a first partition plate 23 and a second partition plate 24. Along the height direction of the valve body 20, a plurality of external conductive chambers 22, a first partition plate 23 and a second partition plate 24 are located between the top plate 201 and the bottom plate 202, and the internal conductive chamber 21 is located between the top plate 201 and the bottom plate 202 and penetrates the bottom plate 202. At least some of the external conductive chambers 22 are distributed on the outer periphery of the internal conductive chamber 21, a first partition plate 23 is located between the internal conductive chamber 21 and the external conductive chamber 22, a second partition plate 24 is located between two adjacent external conductive chambers 22, and the first partition plate 23 has a hole passage 231, and the internal conductive chamber 21 is connected to some of the external conductive chambers 22 via the hole passage 231. In this case, the second communication port 321 communicates with the internal communicating chamber 21 via the valve chamber 101, and the first communication port 311 communicates with the external communicating chamber 22 via the through hole 411 of the sealing body 410, and each external communicating chamber 22 is separated as an independent space by the second partition plate 24. The rotary valve body 20 connects or disconnects two valve ports corresponding to the external connecting chamber 22 through one external connecting chamber 22, and / or connects or disconnects two corresponding valve ports through the internal connecting chamber 21, the hole 231 and the external connecting chamber 22, one of the two valve ports corresponding to the internal connecting chamber 21 and the other corresponding to the external connecting chamber 22. With the above arrangement, the control valve 1 can control multiple flow paths, and is more convenient and compact in use.

[0020] As shown in FIG. 13, the top wall 13 and side wall 11 of the valve body 10 are injection molded as a unitary structure, in which case the valve body 10 further includes a protrusion 16 to provide positional restraint for the sealing member 41 . This protrusion 16 protrudes from the top wall portion 13 and is located inside the valve chamber, and has a first position limiting groove 16a, the groove mouth of the first position limiting groove 16a communicates with the valve chamber, a part of the inner surface of the side wall portion 11 forms a groove wall of the first position limiting groove 16a, and one end in the height direction of the sealing member 41 is located within the first position limiting groove 16a, thereby limiting the assembly position of the sealing member 41, and in this case, the width of the first position limiting groove 16a is greater than or equal to the radial thickness of the sealing member 41. In order to enhance the strength of the valve body 10, the top wall portion 13 is provided with a plurality of connecting ribs arranged along the radial direction of the top wall portion 13. Furthermore, the top wall portion 13 may be provided with a connecting rib extending around the circumference, thereby improving the structural strength of the top wall portion 13. Preferably, the protrusion 16 further includes a second position limiting groove to provide a position limit for the position of the balance sealing block 42 . The groove mouth of this second position limiting groove communicates with the valve chamber 101, one end in the height direction of the balance sealing block 42 is located within the second position limiting groove, and the width of the second position limiting groove is greater than or equal to the radial thickness of the balance sealing block 42.

[0021] 1 to 3, the communication port further includes a second communication port 321. When the valve body includes the mounting portion 14, the second communication port 321 is located at one end in the height direction of the side wall portion 11 and is located on the side away from the sealing member 41, and the mounting portion 14 has a mounting surface 141, and on the mounting surface 141, the valve port 102 communicating with the first communication port 311 and the valve port 102 communicating with the second communication port 321 are both rectangular and have the same cross-sectional area. This arrangement allows for close flow of fluid through each valve port 102 .

[0022] The valve port 102 communicating with the first communication port 311 is defined as the first valve port 312, and the valve port 102 communicating with the second communication port 321 is defined as the second valve port 322, and at the mounting surface 141, the length of the second valve port 322 is more than twice the length of the first valve port 312, and the mounting portion 14 of the valve body 10 further includes a reinforcing rib 142. The reinforcing rib 142 extends along the width direction of the second valve port 322 and is connected between two surfaces of the second valve port 322 that are arranged opposite each other along the height direction of the control valve. With the above arrangement, the strength of each valve port 102 of the control valve 1 can be improved, and the quality of the control valve 1 can be improved.

[0023] As described above, according to the control valve 1 of the embodiment of the present invention, the control valve 1 includes the sealing member 41 and the balance sealing block 42. The cross section of the sealing member 41 is an arc-shaped structure. Compared with the sealing member 41 having a cross section of a circular ring structure, the sealing member 41 of this embodiment has a large expansion space and low manufacturing precision, and the balance sealing block 42 is located between the side wall portion 11 and the valve body 20, and the balance sealing block 42 and the sealing member 41 are respectively provided on both radial sides of the valve body 20, and the surface of the balance sealing block 42 facing the valve body 20 is an arc surface. The center of the arc of the balanced sealing block 42 overlaps with the center of the inner surface of the sealing body 410 and has the same radius. When the valve body 20 presses the sealing member 41 and the balanced sealing block 42, the balanced sealing block 42 and the sealing member 41 generate an acting force of the same magnitude and opposite direction on the valve body 20, holding the valve body 20 and the side wall portion 11 coaxially, improving the stability of the rotation of the valve body 20, preventing fluid leakage due to eccentricity of the valve body 20, and improving the sealing performance of the control valve 1 and the stability of the control of the fluid by the control valve 1, thereby contributing to its widespread use and application.

[0024] Here, the above embodiments are not limiting the present invention but are intended to explain the present invention. For example, the definitions of directions such as "front", "back", "left", "right", "upper", and "lower" have been described in detail in this specification with reference to the above embodiments. However, amendments, combinations, or equivalent replacements may be made to the present invention, and all improvements that do not depart from the spirit and scope of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A control valve including a valve body, a valve element, a sealing member, and a balance sealing block, and having a valve chamber, wherein a side wall portion of the valve body is a peripheral wall or at least a part of a peripheral wall of the valve chamber, and at least a part of the valve element and the sealing member are both located in the valve chamber, The sealing body of the sealing member is located between the valve body and the side wall along a radial direction of the valve body, with an inner surface contacting the valve body and an outer surface contacting the side wall, the balance sealing block is located between the side wall portion and the valve body along a radial direction of the valve body and is in contact with the valve body; The balance sealing block and the sealing member are arranged along the circumferential direction of the valve body, The direction of the force or component of the balance sealing block acting on the valve body is opposite to the direction of the force or component of the sealing member acting on the valve body, The side wall portion of the valve body has communication ports including a plurality of first communication ports, the sealing body of the sealing member has a through hole penetrating the sealing member and communicating with the first communication port, A control valve, wherein the balance sealing block does not have a through hole communicating with the communication port.

2. the control valve includes a passage; The communication port communicates with the valve chamber, Each of the passages has one end penetrating the side wall portion to form the communication port, and the other end forms a valve port of the control valve, A cross section of the sealing member along a direction perpendicular to a height direction of the sealing member has an arc-shaped structure; The number of the communication holes in the region of the side wall portion that contacts the sealing body is the same as the number of the through holes, and the communication holes are correspondingly connected to each other; The balance sealing block and the sealing member are provided on both radial sides of the valve body, The surface of the balance sealing block facing the valve body is an arc surface; The axis of the arc surface of the balance sealing block overlaps with the axis of the inner surface of the sealing body, and the radii of both are equal; 2. The control valve according to claim 1, wherein the valve body and the side wall portion are arranged coaxially.

3. the sealing member includes a first elastic pad and a first sealing member fixedly connected to each other; the first elastic pad is located between the first sealing member and the side wall portion, the first sealing member is located between the first elastic pad and the valve body and in contact with the valve body; 2. The control valve of claim 1, wherein the surface roughness of the first sealing member facing the valve body is less than the surface roughness of the first elastomeric pad facing away from the valve body.

4. the balance sealing block includes a second elastic pad and a second sealing member fixedly connected to each other; the second elastic pad is located between the second sealing member and the side wall portion, the second sealing member is located between the second elastic pad and the valve body and in contact with the valve body; 4. The control valve of claim 3, wherein the surface roughness of the second sealing member facing the valve body is less than the surface roughness of the second elastomeric pad facing away from the valve body.

5. The first elastic pad is made of rubber, The main material of the first sealing member is Teflon; The first elastic pad and the first sealing member are fixed to each other as an integral structure by being bonded to each other, The second elastic pad is made of rubber, and the main material of the second sealing member is Teflon.

5. The control valve according to claim 4, wherein the second elastic pad and the second sealing member are fixed to each other as a single unit by being bonded together.

6. The valve body has an accommodation chamber and an opening along a radial direction of the side wall portion, The storage chamber communicates with the valve chamber through the opening, a cross-sectional area of ​​the chamber is greater than a cross-sectional area of ​​the opening; the balance sealing block includes a first portion and a second portion fixedly connected to each other and projecting from the opening; a cross-sectional area of ​​the first portion greater than a cross-sectional area of ​​the opening; The first portion is located in the chamber, The control valve according to any one of claims 1 to 5, wherein the second portion contacts the valve body through the opening.

7. the balance sealing block includes a second elastic pad and a second sealing member fixedly connected to each other; The first portion is the second elastic pad, 7. The control valve of claim 6, wherein the second portion is the second sealing member, or the first portion is the second elastic pad and a part of the second sealing member, and the second portion is another part of the second sealing member.

8. The height of the balance sealing block and the sealing member are equal, The control valve according to any one of claims 1 to 5 and 7, characterized in that a contact height between the sealing member and the valve body along a height direction of the valve body is equal to a contact height between the balance sealing block and the valve body.

9. The sealing member further includes position limiting portions at both circumferential ends of the sealing body, The position limiting portion has a position limiting surface, the position limiting surface is connected between an inner surface and an outer surface of the sealing member; The valve body further includes a stopper portion, the stopper portion is fixedly connected to the side wall portion or is a part of the side wall portion; The stopper portion has stopper surfaces located at both ends in a circumferential direction of the stopper portion, the stopper surface is located in the valve chamber, 8. The control valve according to claim 1, wherein the position limiting surface and the stopper surface are arranged so as to come into contact with each other.

10. The side wall portion contacting the sealing member along a circumferential direction of the side wall portion has two rows of communication holes arranged thereon, Two of the through holes are arranged in the sealing member along a circumferential direction of the sealing member, 3. The control valve according to claim 2, wherein a central angle corresponding to an arc surface of the sealing body in a cross section perpendicular to a height direction of the sealing member is greater than a central angle corresponding to edges of the two communication ports arranged along a circumferential direction in the side wall portion.

11. The valve body further includes a top wall portion and a bottom wall portion. At least a portion of the side wall portion is located between the top wall portion and the bottom wall portion, the top wall and the side wall are injection molded as a unitary structure; the bottom wall and the side wall are arranged to be sealed together, The valve body further includes a protrusion. the protrusion protrudes from the top wall portion and is located within the valve chamber, The protrusion has a first position limiting groove, a groove mouth of the first position limiting groove communicates with the valve chamber, One end of the sealing member in the height direction is located within the first position limiting groove, 8. The control valve according to claim 1, wherein a width of the first position limiting groove is equal to or greater than a thickness of the sealing member.

12. The protrusion has a second position limiting groove, a groove mouth of the second position limiting groove communicates with the valve chamber, One end of the balance sealing block in the height direction is located within the second position limiting groove, 12. The control valve according to claim 11, wherein the width of the second position limiting groove is equal to or greater than the thickness of the balance sealing block.

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