A precision positioning rotary valve

Abstract

The present application relates to the field of valve technology, and discloses a precision-positioned rotary valve, including a valve head, a rotor, an encoder disc, and an encoder reader. The rotor is sealed with the valve head, and the rotor can rotate relative to the valve head. The encoder disc is configured to rotate coaxially with the rotor, and the encoder reader is used to detect the rotation position of the encoder disc to determine the rotation position of the rotor. The present application uses an encoder disc and an encoder reader to detect and identify the rotation position of the rotor. Compared with the known method of using an optical coupling baffle and an optical coupling integration, the present application can effectively improve the accuracy of detecting and identifying the rotation position of the rotor, thereby facilitating the accuracy of flow path switching, and facilitating the accurate rotation of the rotor to a sealing position, so as to facilitate leak detection of the rotary valve.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a precision-positioned rotary valve. Background Art

[0002] The contents of this section merely provide background information related to the present application and may not constitute prior art.

[0003] In currently known rotary valves, in order to ensure accuracy during flow path switching, a conventional approach is to provide a position recognition module consisting of an optical coupling baffle and an optical coupling assembly (ie, an optical coupling control board) to detect and recognize the rotational position of the rotor during rotation.

[0004] However, with regard to the method of using an optocoupler baffle and an optocoupler integration to detect and identify the rotational position of the rotor, the optocoupler baffle needs to be processed with a corresponding number of light slits according to the number of switchable flow channels of the rotary valve. For example, when the rotary valve is a 28-way rotary valve with 28 switchable flow channels, the optocoupler baffle needs to be processed with 28 light slits. Not only is the process of processing the optocoupler baffle cumbersome, but also when the number of switchable flow channels of the rotary valve is large, the interval between two adjacent light slits on the optocoupler baffle is too small, which may cause abnormal conditions when identifying the rotational position of the rotor, affecting the accuracy of flow path switching.

[0005] At the same time, in order to detect leakage, the known rotary valve usually needs to rotate the rotor to a sealing position (i.e., a position where the flow channel on the rotor does not connect any two flow channels on the valve head). However, in the case of the solution using an optical coupling baffle and optical coupling integration, since the rotary valve has a sealing test requirement and the optical gap is judged as an open-loop control in a broad sense, the position accuracy of the flow channel on the rotor is extremely high, and it is difficult to accurately rotate the rotor to a sealing position. Utility Model Content

[0006] In view of this, the purpose of the present application is to provide a precision-positioned rotary valve, which can more accurately detect and identify the rotational position of the rotor, thereby improving the accuracy of flow path switching and facilitating the precise rotation of the rotor to a sealing position.

[0007] The purpose of this application is achieved through the following technical solutions:

[0008] A precision positioning rotary valve, comprising:

[0009] Valve head;

[0010] a rotor, the rotor being in sealing cooperation with the valve head and being configured to be rotatable relative to the valve head;

[0011] An encoder code disc is configured to rotate coaxially with the rotor;

[0012] The encoder reader is used to detect the rotational position of the encoder code disk to determine the rotational position of the rotor.

[0013] In some possible embodiments, the encoder code disc is integrated on the rotor.

[0014] In some possible embodiments, a rotor base is provided on a side of the rotor away from the valve head, and the rotor base is configured to drive the rotor to rotate coaxially;

[0015] The encoder code disc is coaxially sleeved on the outer wall of the rotor base.

[0016] In some possible embodiments, a rotor base is provided on a side of the rotor away from the valve head, and the rotor base is configured to drive the rotor to rotate coaxially;

[0017] The rotary valve also includes a fixed guide ring and a locating bearing. The side of the rotor base facing away from the rotor passes through the guide ring and the locating bearing in sequence. The rotor base and the guide ring, and the rotor base and the inner ring of the locating bearing are all rotationally matched.

[0018] In some possible embodiments, the rotary valve further includes a valve seat and a bracket;

[0019] The valve head is fixedly connected to the valve seat, the valve seat defines an accommodating cavity inside, and the rotor is accommodated in the accommodating cavity;

[0020] The bracket is arranged on a side of the valve seat away from the valve head, the rotor base, the guide ring and the positioning bearing are all accommodated inside the bracket, and the side of the rotor base away from the rotor extends outside the bracket;

[0021] The encoder code disc is sleeved on the outer wall of the rotor base outside the bracket, and the encoder reader is fixedly arranged on the bracket and aligned with the encoder code disc.

[0022] In some possible embodiments, a thrust bearing and a disc spring are further disposed inside the bracket, and the rotor base passes through the thrust bearing and is rotationally matched with the inner ring of the thrust bearing;

[0023] The disc spring is sleeved on the outer wall of the rotor base and is configured to apply an elastic force toward the rotor to the rotor base.

[0024] In some possible embodiments, the rotary valve further includes a driving unit, the driving unit is used to output a rotational motion, and the rotor is transmission-connected to an output end of the driving unit.

[0025] In some possible embodiments, the driving unit includes a motor and a reducer, an input end of the reducer is transmission-connected to an output end of the motor, and an output end of the reducer is transmission-connected to the rotor.

[0026] In some possible embodiments, the rotary valve further includes a controller, and the encoder read head is communicatively connected to the controller.

[0027] The technical solution of the embodiment of the present application has at least the following advantages and beneficial effects:

[0028] 1. The present application uses an encoder code disk and an encoder reader to detect and identify the rotational position of the rotor. Compared with the known method of using an optical coupling baffle and an optical coupling integration, it can effectively improve the accuracy of detecting and identifying the rotational position of the rotor, thereby facilitating the accuracy of flow path switching and facilitating the precise rotation of the rotor to a sealing position, so as to facilitate leakage detection of the rotary valve.

[0029] 2. The present application integrates the encoder code disc on the rotor so that the rotation position detected by the encoder code disc and the encoder reader can be closer to the actual rotation position of the rotor, thereby ensuring the accuracy of detecting and identifying the rotation position of the rotor, and further improving the accuracy of flow path switching.

[0030] 3. By adding a guide ring and a positioning bearing for guiding and limiting the rotor base, compared with the known rotary valve which only provides one guide ring to limit and guide the rotor base, the present application can further prevent the rotor base from swinging when driving the rotor to rotate, thereby further ensuring the coaxiality between the rotor and the valve head. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of a rotary valve provided in an embodiment of the present application;

[0032] Figure 2 for Figure 1 A top view of a rotary valve is shown;

[0033] Figure 3 for Figure 2 Sectional view along AA direction;

[0034] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0035] Figure 5 A schematic structural diagram of a rotor, a rotor base, an encoder code disc, and an encoder reader provided in an embodiment of the present application.

[0036] Icon: 10-valve head, 11-first sealing surface, 20-rotor, 21-second sealing surface, 30-rotor base, 40-drive unit, 41-motor, 42-reducer, 50-encoder code disk, 60-encoder reader, 70-valve seat, 80-bracket, 90-thrust bearing, 100-disc spring, 110-guide ring, 120-positioning bearing, 130-controller. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with specific implementation methods. The same figure marks in the accompanying drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] Compared to the embodiments shown in the drawings, feasible implementations within the scope of protection of the present application may have fewer components, other components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0039] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meanings understood by persons with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components.

[0040] Please refer to Figures 1 to 5 The embodiments of the present application disclose a precisely positioned rotary valve. Generally speaking, the rotary valve disclosed in the embodiments of the present application may include a valve head 10 and a rotor 20 .

[0041] Combination Figure 3 and Figure 4 As shown, the valve head 10 has a first sealing surface 11, and the valve head 10 is provided with a plurality of fluid flow channels for fluid flow that penetrate the first sealing surface 11. Preferably, the plurality of fluid flow channels are distributed in an annular array with the geometric center of the valve head 10 as the center, so that the structure of the valve head 10 is more compact and beautiful.

[0042] The rotor 20 is sealed with the valve head 10. Specifically, the rotor 20 has a second sealing surface 21 and is disposed below the valve head 10. The rotor 20 is tightly fitted with the first sealing surface 11 of the valve head 10 through the second sealing surface 21 to form a seal. In addition, the second sealing surface 21 of the rotor 20 has a transition flow channel, which is configured to connect two of the multiple fluid flow channels on the valve head 10 when the rotor 20 rotates to the conducting position.

[0043] Specifically, the rotor 20 can rotate relative to the valve head 10, and the transition channel can connect two different fluid channels by means of the rotation of the rotor 20, so that the basic flow path switching function can be achieved. It should be noted that the flow path switching process described in the embodiment of the present application is a function that all rotary valves known in the prior art have, and will not be described in detail here.

[0044] In order to enable the rotor 20 to rotate relative to the valve head 10, the Figure 1 and Figure 3 As shown in the content, the rotary valve disclosed in the embodiment of the present application may further include a rotor base 30 and a driving unit 40 .

[0045] The rotor base 30 is disposed on a side of the rotor 20 away from the valve head 10, and the rotor base 30 is coaxially disposed with the rotor 20, so that the rotor base 30 can drive the rotor 20 to rotate coaxially. Of course, in other embodiments of the present application, the rotor base 30 may also be a portion extending downward from the bottom of the rotor 20, that is, the rotor base 30 and the rotor 20 may be one component.

[0046] The driving unit 40 is used to output rotational motion, and the rotor 20 is transmission-connected to the output end of the driving unit 40. Specifically, the rotor base 30 can be transmission-connected to the output end of the driving unit 40, so that when the driving unit 40 outputs rotational motion, it can drive the rotor base 30 to rotate coaxially, thereby driving the rotor 20 to rotate coaxially through the rotor base 30, thereby realizing the switching of the flow path or rotating the rotor 20 to the sealing position (that is, the position where the transition flow channel of the rotor 20 does not connect any two fluid flow channels on the valve head 10).

[0047] Furthermore, the driving unit 40 may include a motor 41 and a reducer 42. The motor 41 may be, but is not limited to, a stepper motor, the output end of the motor 41 is transmission-connected to the input end of the reducer 42, and the output end of the reducer 42 is transmission-connected to the rotor 20, specifically, the rotor base 30. In this way, when the motor 41 is working, the rotor 20 can be driven to rotate under the transmission action of the reducer 42 and the rotor base 30.

[0048] On this basis, combined with the description of the background technology of this application, it can be seen that in order to detect and identify the rotation position of the rotor 20, the conventional method adopted by the known rotary valve is to set an optical coupling baffle and an optical coupling integration. In this way, not only is the processing process of the optical coupling baffle cumbersome, but also when the number of switchable flow channels of the rotary valve (that is, the number of fluid flow channels on the valve head 10 mentioned above) is large, the spacing between adjacent light slits on the optical coupling baffle is too small, affecting the accuracy of flow channel switching. In addition, it is difficult to achieve accurate rotation of the rotor 20 to the sealing position by using the optical coupling baffle and the optical coupling integration, which is not conducive to the leakage detection of the rotary valve.

[0049] To this end, combined Figure 3 and Figure 4 As shown in the content, the rotary valve disclosed in the embodiment of the present application further includes an encoder disc 50 and an encoder head 60, which together constitute a rotary encoder for outputting a pulse signal. The encoder disc 50 is configured to be able to rotate coaxially with the rotor 20. For example, the encoder disc 50 can be integrated on the rotor 20, specifically, the encoder disc 50 can be coaxially sleeved on the outer wall of the rotor base 30, or the encoder disc 50 can be coaxially sleeved on the output end of the drive unit 40, such as the output shaft of the reducer 42. It is worth noting that although the two methods listed here can make the encoder disc 50 rotate coaxially with the rotor 20, there are still certain differences between the two methods, which will be explained in detail later.

[0050] The encoder reader 60 is used to cooperate with the encoder code disk 50. When the encoder code disk 50 rotates coaxially with the rotor 20, the encoder reader 60 can detect the rotation position of the encoder code disk 50, thereby determining the rotation position of the rotor 20.

[0051] It is worth noting that compared with the method of using optical coupling baffles and optical coupling integration to detect and identify the rotational position of the rotor 20, based on each rotation of the rotor 20, the rotary encoder composed of the encoder code disk 50 and the encoder reader 60 can output at least 1000 pulse signals containing the rotational position information of the rotor 20 (that is, the rotational position when the rotor 20 rotates one circle is divided into 1000). Therefore, the detection and identification of the rotational position of the rotor 20 by the combination of the encoder code disk 50 and the encoder reader 60 can be suitable for rotary valves with more switchable flow channels, and can effectively improve the accuracy of detecting and identifying the rotational position of the rotor 20, which is beneficial to improving the accuracy of flow path switching. At this time, it is only necessary to encode the position of the rotor 20 when it is in the sealing position on the encoder code disk 50, so that the rotor 20 can be accurately rotated to the sealing position when the rotary valve needs to be checked for leaks, without requiring the components to have excessively high assembly accuracy, which is conducive to easily realizing mass production of rotary valves. Furthermore, during actual manufacturing, the rotary encoder composed of the encoder code disc 50 and the encoder reader 60 can be manufactured as a standard part, which is lower in cost and easier to assemble.

[0052] In addition, the inventors of the present application further discovered that known rotary valves usually arrange the optical coupling baffle at the output end of the drive unit 40, such as the output shaft of the motor 41 or the output shaft of the reducer 42 listed above. In this way, since the rotor 20 and the drive unit 40 are not on the same positioning system and are affected by the assembly tolerances between the components, when the drive unit 40 drives the rotor 20 to rotate, the rotor 20 and the output end of the drive unit 40 cannot absolutely rotate around the same central axis. In other words, there may be a deviation between the rotation position of the rotor 20 and the rotation position of the output end of the drive unit 40. Therefore, if the optical coupling baffle is arranged at the output end of the drive unit 40, it may lead to erroneous detection of the rotation position of the rotor 20, thereby affecting the accuracy of flow path switching.

[0053] To this end, the rotary valve disclosed in the embodiment of the present application further defines that the encoder disc 50 for detecting the rotational position of the rotor 20 is integrated on the rotor 20, such as Figure 5 As shown, the encoder disc 50 may be coaxially sleeved on the outer wall of the rotor base 30. In this way, when the rotor 20 rotates under the drive of the driving unit 40, the rotation position detected by the encoder disc 50 and the encoder reader 60 can be closer to the actual rotation position of the rotor 20, thereby ensuring the accuracy of detecting and identifying the rotation position of the rotor 20, and further improving the accuracy of flow path switching.

[0054] In some embodiments of the present application, in order to ensure the integrity of the rotary cutting valve structure, Figure 1 and Figure 3As shown, the rotary valve may further include a valve seat 70 and a bracket 80 .

[0055] The valve seat 70 is used to provide a carrier for the installation of the valve head 10 and to protect the rotor 20. Specifically, the valve head 10 can be fixedly connected to the top of the valve seat 70 by means of fasteners such as screws, and the valve seat 70 is provided with a receiving cavity suitable for accommodating the rotor 20 to provide protection for the rotor 20.

[0056] The bracket 80 is disposed on the side of the valve seat 70 away from the valve head 10. At this time, the reducer 42 of the drive unit 40 can be connected to the side of the bracket 80 away from the valve seat 70. The rotor base 30 is accommodated in the bracket 80 to provide protection for the rotor base 30.

[0057] At the same time, if Figure 4 As shown, the bracket 80 is also fixedly provided with components such as a thrust bearing 90, a disc spring 100, a guide ring 110, and a locating bearing 120. The side of the rotor base 30 away from the rotor 20 passes through the guide ring 110, the thrust bearing 90, and the locating bearing 120 in sequence, that is, the guide ring 110 can be arranged at a position close to the rotor 20 inside the bracket 80, the locating bearing 120 can be arranged at a position far away from the rotor 20 inside the bracket 80, and the thrust bearing 90 can be arranged between the guide ring 110 and the locating bearing 120.

[0058] Furthermore, the rotor base 30 and the guide ring 110, the rotor base 30 and the inner ring of the positioning bearing 120, and the rotor base 30 and the inner ring of the thrust bearing 90 are all rotationally matched. The disc spring 100 is coaxially sleeved on the rotor base 30, and the two ends of the disc spring 100 are respectively in contact with the thrust bearing 90 and the rotor base 30, so that the disc spring 100 applies an elastic force toward the rotor 20 to the rotor base 30, and then relies on the elastic force to form a reliable seal between the second sealing surface 21 of the rotor 20 and the first sealing surface 11 of the valve head 10.

[0059] It can be understood that the thrust bearing 90 is used to bear the axial force that always exists when the rotor base 30 rotates, and the guide ring 110 and the positioning bearing 120 are used to guide and limit the rotor base 30 together with the rotor 20, so that when the rotor base 30 drives the rotor 20 to rotate, the coaxiality of the rotor 20 and the valve head 10 can always be maintained within an acceptable range. Compared with the known rotary valve that only sets a guide ring 110 to limit and guide the rotor base 30, it can further prevent the rotor base 30 from swinging when the rotor 20 rotates, thereby further ensuring the coaxiality between the rotor 20 and the valve head 10. In addition, the use of flanged deep groove ball bearings as positioning bearings 120 can also rely on the positioning bearings 120 to reliably bear the radial load when the rotor base 30 rotates, which is conducive to improving the reliability of the rotor base 30 when it rotates.

[0060] Continue to refer to Figure 4 In some embodiments of the present application, the side of the rotor base 30 away from the rotor 20 can also be extended to the outside of the bracket 80. In this case, the encoder disc 50 can be sleeved on the outer wall of the rotor base 30 outside the bracket 80, and the encoder head 60 is fixedly arranged at the bottom of the bracket 80 and aligned with the encoder disc 50. In this way, it is convenient to replace and maintain the encoder disc 50 and the encoder head 60 after the drive unit 40 is removed later.

[0061] In some embodiments of the present application, the rotary valve may further include a controller 130 disposed on an outer wall such as a reducer 42, and the electrical components such as the encoder reader 60 and the motor 41 mentioned above are communicatively connected to the controller 130, so that the controller 130 can receive a pulse signal containing the rotation position of the rotor 20 emitted by the encoder reader 60, and the controller 130 can control the motor 41 based on the pulse signal so that the rotor 20 can rotate to a predetermined position, thereby realizing the switching of the flow path or rotating the rotor 20 to a sealing position.

[0062] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A precision positioning rotary valve, characterized in that: include: Valve head; a rotor, the rotor being in sealing cooperation with the valve head and being configured to be rotatable relative to the valve head; An encoder code disc is configured to rotate coaxially with the rotor; The encoder reader is used to detect the rotational position of the encoder code disk to determine the rotational position of the rotor.

2. The precision positioning rotary valve according to claim 1, characterized in that: The encoder code disc is integrated on the rotor.

3. The precision positioning rotary valve according to claim 2, characterized in that: A rotor base is provided on a side of the rotor away from the valve head, and the rotor base is configured to drive the rotor to rotate coaxially; The encoder code disc is coaxially sleeved on the outer wall of the rotor base.

4. The precision positioning rotary valve according to claim 1, characterized in that: A rotor base is provided on a side of the rotor away from the valve head, and the rotor base is configured to drive the rotor to rotate coaxially; It also includes a fixed guide ring and a locating bearing. The side of the rotor base facing away from the rotor passes through the guide ring and the locating bearing in sequence. The rotor base and the guide ring, and the rotor base and the inner ring of the locating bearing are all rotationally matched.

5. The precision positioning rotary valve according to claim 4, characterized in that: Also includes a valve seat and a bracket; The valve head is fixedly connected to the valve seat, the valve seat defines an accommodating cavity inside, and the rotor is accommodated in the accommodating cavity; The bracket is arranged on a side of the valve seat away from the valve head, the rotor base, the guide ring and the positioning bearing are all accommodated inside the bracket, and the side of the rotor base away from the rotor extends outside the bracket; The encoder code disc is sleeved on the outer wall of the rotor base outside the bracket, and the encoder reader is fixedly arranged on the bracket and aligned with the encoder code disc.

6. The precision positioning rotary valve according to claim 5, characterized in that: A thrust bearing and a disc spring are also arranged inside the bracket, and the rotor base passes through the thrust bearing and is rotatably matched with the inner ring of the thrust bearing; The disc spring is sleeved on the outer wall of the rotor base and is configured to apply an elastic force toward the rotor to the rotor base.

7. The precision positioning rotary valve according to claim 1, characterized in that: It also includes a driving unit, which is used to output rotational motion, and the rotor is transmission-connected to an output end of the driving unit.

8. The precision positioning rotary valve according to claim 7, characterized in that: The driving unit includes a motor and a reducer, wherein an input end of the reducer is transmission-connected to an output end of the motor, and an output end of the reducer is transmission-connected to the rotor.

9. The precision positioning rotary valve according to claim 1, characterized in that: Also included is a controller, the encoder read head being communicatively coupled to the controller.

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