Rotary shear valve

Abstract

The utility model provides a kind of rotary shear valve, including valve head, stator, rotor, rotating shaft and elastic part, valve head has first liquid inlet hole and first liquid outlet hole, stator is attached with valve head, stator has second liquid inlet hole and second liquid outlet hole.Rotor is attached with stator, rotor is equipped with the liquid delivery groove being communicated with second liquid inlet hole, liquid delivery groove can be controllably communicated or not communicated with second liquid outlet hole in the rotor rotating process.Rotating shaft is used to drive rotor rotation.Elastic part can make that rotating shaft has the movement tendency of moving towards rotor.Elastic part of the utility model can provide a compression force to rotating shaft, rotating shaft has the movement tendency of moving towards stator under the action of the compression force, to drive rotor to compress stator in turn, so that valve head, stator and rotor are mutually resisted between, even if valve head, stator and rotor have produced certain abrasion after long time use, three can still keep the relationship of close attachment, avoid the problem that rotary shear valve appears liquid leakage.

Description

Technical Field

[0001] This utility model belongs to the field of fluid control technology, and specifically relates to a rotary shear valve. Background Technology

[0002] Laboratory rotary shear valves are mainly used in pharmaceutical, chemical, biological, food science, mass spectrometry, and microfluidics experiments. Existing rotary shear valves primarily consist of a valve head, stator, and rotor arranged sequentially and fitting together. The valve head and stator have interconnected inlet and outlet channels, while the rotor has a delivery groove. When the rotor rotates to a preset angle, it simultaneously connects to both the inlet and outlet channels, thus opening the rotary shear valve and allowing liquid to pass smoothly through it.

[0003] However, after prolonged use, the contact surfaces of the stator and rotor of the existing rotary shear valve will experience a certain degree of wear due to frequent start-up and rotational friction, resulting in liquid leakage at the contact surfaces of the stator and rotor.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a rotary shear valve that solves the problem of liquid leakage that easily occurs in existing rotary shear valves after prolonged use.

[0006] To achieve the above objectives, a specific embodiment of this utility model provides a rotary shear valve. The rotary shear valve includes a valve head, a stator, a rotor, a shaft, and an elastic element. The valve head has a first inlet hole and a first outlet hole that are connected through it. The stator is fixed in position and fits against the valve head. The stator has a second inlet hole and a second outlet hole that are connected through it and communicate with the first inlet hole. The rotor is located on the side of the stator away from the valve head and fits against it. A delivery groove connected to the second inlet hole is provided on the side of the rotor facing the stator. The delivery groove can be controlled to connect or not connect with the second outlet hole during rotor rotation. The shaft is located on the side of the rotor away from the stator and is used to drive the rotor to rotate. The elastic element is configured to give the shaft a tendency to move towards the stator.

[0007] In one or more embodiments of this utility model, the rotating shaft includes a supporting part and a shaft part coaxially arranged. The diameter of the supporting part is larger than the diameter of the shaft part and is used to connect the rotor. An elastic element is fitted onto the shaft part and abuts against the supporting part on the side away from the rotor.

[0008] In one or more embodiments of the present invention, the rotary shear valve further includes a stator support ring connected to the valve head and used to fix the stator, and a protective shell disposed on the side of the stator support ring away from the valve head, with the abutment and elastic member located inside the protective shell.

[0009] In one or more embodiments of this utility model, the rotary shear valve further includes a thrust ball bearing disposed within a protective shell, with the two axial ends of the thrust ball bearing respectively abutting against the elastic element and the inner wall of the protective shell.

[0010] In one or more embodiments of this utility model, the rotary shear valve further includes a deep groove ball bearing disposed within a protective housing, and the supporting portion is sleeved within the deep groove ball bearing.

[0011] In one or more embodiments of this utility model, the rotary shear valve further includes a retaining ring disposed within a protective housing, the retaining ring abutting against the side of the deep groove ball bearing near the rotor.

[0012] In one or more embodiments of the present invention, the rotary shear valve further includes a motor for driving the rotating shaft to rotate, and a planetary gear reducer connected between the motor and the rotating shaft.

[0013] In one or more embodiments of this utility model, the rotary shear valve further includes an encoder and a code reader. The encoder is used to detect the rotation angle of any one or more of the rotating shaft, the output shaft of the motor, the input shaft of the planetary gear reducer, or the output shaft of the planetary gear reducer, and transmits the encoded information containing the rotation angle to the code reader. The code reader is used to decode the encoded information it receives.

[0014] In one or more embodiments of the present invention, the rotary shear valve further includes a plurality of pins inserted along the axial direction of the rotor into the rotor and the shaft.

[0015] In one or more embodiments of this utility model, the central axis of the first liquid inlet coincides with the central axis of the valve head, and multiple first liquid outlets are provided and arranged around the first liquid inlet; the central axis of the second liquid inlet coincides with the central axis of the stator, and multiple second liquid outlets are provided and arranged around the second liquid inlet; the multiple second liquid outlets and the multiple first liquid outlets are connected to each other in a one-to-one correspondence, and the liquid delivery tank can be controlled to be connected to any one of the second liquid outlets.

[0016] Compared with the prior art, the elastic element of this utility model can provide a clamping force to the rotating shaft. Under the action of the clamping force, the rotating shaft has a tendency to move towards the stator, thereby driving the rotor to press against the stator, so that the valve head, stator and rotor abut against each other. Even if the valve head, stator and rotor have a certain wear after long-term use, the three can still maintain a tight fit, avoiding the problem of liquid leakage in the rotary shear valve. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the rotary shear valve in one embodiment of the present invention; Figure 2 This is a cross-sectional view of a partial area of ​​the rotary shear valve in one embodiment of the present invention; Figure 3 This is a cross-sectional view of the rotor and shaft in one embodiment of the present invention.

[0019] Key reference numerals in the attached drawings: 1. Valve head; 101. First inlet port; 102. First outlet port; 2. Stator; 201. Second inlet port; 202. Second outlet port; 3. Rotor; 301. Liquid delivery tank; 4. Shaft; 401. Supporting part; 402. Shaft part; 5. Elastic element; 6. Stator support ring; 7. Protective shell; 8. Thrust ball bearing; 9. Deep groove ball bearing; 10. Snap ring; 11. Motor; 12. Planetary gear reducer; 13. Pin; 14. PCB board. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0021] In the description of this utility model, it should be understood that the terms "top", "bottom", "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the term "first" is 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 as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In one embodiment, reference is made to Figures 1 to 3 As shown, this utility model provides a rotary shear valve. This rotary shear valve employs a clamping design, where the valve head 1, stator 2, and rotor 3 are tightly fitted together through a clamping structure. Furthermore, even if the valve head 1, stator 2, and rotor 3 experience some wear during operation, the clamping structure ensures that they remain tightly fitted together, preventing liquid leakage from the rotary shear valve.

[0024] Specifically, the rotary shear valve includes a valve head 1, a stator 2, a rotor 3, a shaft 4, and an elastic element 5. The valve head 1 has a first inlet hole 101 and a first outlet hole 102, both of which penetrate the valve head 1. The stator 2 is fixed in position and fits against the valve head 1. The stator 2 has a second inlet hole 201 and a second outlet hole 202, both of which penetrate the stator 2. The end of the first inlet hole 101 furthest from the stator 2 is connected to a liquid supply source via a connector or pipeline. The side of the first inlet hole 101 closest to the stator 2 is connected to the second inlet hole 201. The first inlet hole 101 and the second inlet hole 201 together form an inlet channel. The end of the first liquid outlet 102 away from the stator 2 is used to connect to components such as terminal actuators or reaction equipment through a connector or pipeline. The side of the first liquid outlet 102 closer to the stator 2 is connected to the second liquid outlet 202. The first liquid outlet 102 and the second liquid outlet 202 together form a liquid outlet channel. The rotor 3 is located on the side of the stator 2 away from the valve head 1. The rotor 3 and the stator 2 are basically coaxial, and the end faces of the rotor 3 and the stator 2 are in contact with each other. The side of the rotor 3 facing the stator 2 is provided with a liquid delivery tank 301. During the rotation of rotor 3, infusion tank 301 is always connected to the second inlet hole 201 (equivalent to infusion tank 301 always being connected to inlet channel). However, infusion tank 301 can only be connected to the second outlet hole 202 when rotor 3 rotates to a preset angle (equivalent to infusion tank 301 being connected to outlet channel). This allows inlet channel (i.e., first inlet hole 101 and second inlet hole 201) and outlet channel (i.e., first outlet hole 102 and second outlet hole 202) to be connected. Rotary shear valve can connect its upstream and downstream liquid pipelines, so that the liquid in the liquid supply source can be smoothly delivered to components such as terminal actuator or reaction equipment. When the rotor 3 does not rotate to the preset angle, the infusion tank 301 is not connected to the second outlet hole 202, thus preventing the inlet channel (i.e., the first inlet hole 101 and the second inlet hole 201) from communicating with the outlet channel (i.e., the first outlet hole 102 and the second outlet hole 202). The rotary shear valve can then cut off the upstream and downstream liquid pipelines, preventing the liquid in the supply source from being delivered to components such as the terminal actuator or reaction equipment. The rotating shaft 4 is located on the side of the rotor 3 away from the stator 2, and is used to drive the rotor 3 to rotate. The elastic element 5 can generally be a common spring (such as a wave spring) or other components with a certain elastic deformation capability. The elastic element 5 is in a compressed state and abuts against the rotating shaft 4. The elastic element 5 is constructed to provide a clamping force to the rotating shaft 4. Under the action of this clamping force, the rotating shaft 4 has a tendency to move towards the stator 2, thereby causing the valve head 1, stator 2 and rotor 3 to abut against each other. Even if the valve head 1, stator 2 and rotor 3 are worn after a long period of use, the three can still maintain a tight fit, avoiding the problem of liquid leakage in the rotary shear valve.

[0025] In one embodiment, reference is made to Figure 3 As shown, the rotating shaft 4 includes a coaxially arranged abutment portion 401 and a shaft portion 402. The diameter of the abutment portion 401 is larger than the diameter of the shaft portion 402. The abutment portion 401 is used to connect to and abut against the rotor 3. The elastic member 5 is fitted onto the shaft portion 402, and one side of the elastic member 5 abuts against the side of the abutment portion 401 away from the rotor 3. This design can stabilize the position of the spring, ensuring that the elastic member 5 can apply a stable force to the abutment portion 401 along the axial direction of the rotating shaft 4, so that the abutment portion 401 can stably apply a clamping force to the rotor 3, thereby keeping the valve head 1, stator 2, and rotor 3 in close contact. Furthermore, the assembly and positioning method between the elastic member 5 and the rotating shaft 4 is relatively simple, which can simplify the overall installation steps of the rotary shear valve and improve the overall assembly efficiency of the rotary shear valve.

[0026] Furthermore, referring to Figure 2 As shown, the rotary shear valve also includes a stator support ring 6 and a protective shell 7. The stator support ring 6 is fixedly connected to the valve head 1, and the protective shell 7 is fixedly connected to the side of the stator support ring 6 away from the valve head 1. The stator 2 is fixed to the inner side of the stator support ring 6 by means of radial pins, radial bolts, and other structures. The abutment part 401 and the elastic element 5 of the rotating shaft 4 are located inside the protective shell 7, and the shaft part 402 of the rotating shaft 4 extends from inside the protective shell 7 in a direction away from the rotor 3 to the outside of the protective shell 7. The protective shell 7 provides sealing protection to prevent external dust and other contaminants from contacting the rotor 3 and other components.

[0027] Furthermore, referring to Figure 2 As shown, the rotary shear valve also includes a thrust ball bearing 8 housed within the protective housing 7. The axial ends of the thrust ball bearing 8 respectively abut against the elastic element 5 and the inner wall of the protective housing 7. The thrust ball bearing 8 can bear and transmit the axial clamping force of the elastic element 5, significantly reducing the frictional resistance during the rotation of the shaft 4. This ensures that the clamping force provided by the elastic element 5 can be stably and efficiently applied to the rotor 3 through the shaft 4, while simultaneously preventing wear on the inner wall of the protective housing 7, thus improving the overall sensitivity, smoothness, and durability of the rotary shear valve.

[0028] Furthermore, referring to Figure 2 As shown, the rotary shear valve also includes a deep groove ball bearing 9 disposed within the protective housing 7, with the outer peripheral wall of the deep groove ball bearing 9 fitting against the inner peripheral wall of the protective housing 7. A supporting portion 401 is fitted within the deep groove ball bearing 9, and the diameter of the portion of the supporting portion 401 located within the deep groove ball bearing 9 is equal to the inner diameter of the deep groove ball bearing 9. The deep groove ball bearing 9 allows for precise radial limiting of the small-diameter section, ensuring coaxiality and stability during the rotation of the shaft 4 and preventing shaft 4 from wobbling.

[0029] Furthermore, referring to Figure 2As shown, the rotary shear valve also includes a retaining ring 10 housed within the protective housing 7. The retaining ring 10 can be a C-type retaining ring. The retaining ring 10 is embedded in the inner wall of the protective housing 7 and abuts against the side of the deep groove ball bearing 9 closest to the rotor 3. The retaining ring 10 provides reliable and easy axial positioning for the deep groove ball bearing 9, preventing displacement under vibration or axial forces, thereby ensuring the long-term stability of the deep groove ball bearing 9's position and enhancing the sealing reliability of the rotary shear valve under dynamic operation.

[0030] In one embodiment, reference is made to Figure 1 As shown, the rotary shear valve also includes a motor 11 and a planetary gear reducer 12. The motor 11 can be a stepper motor. The planetary gear reducer 12 is connected between the motor 11 and the rotating shaft 4, transmitting the power output from the motor 11 to the rotating shaft 4, thereby driving the rotating shaft 4 to rotate. The planetary gear reducer 12 can achieve a large reduction ratio, converting the high-speed rotation of the motor 11 into a high-torque, low-speed precision output from the rotating shaft 4, ensuring that the rotor 3 can rotate accurately and stably to a preset angle, allowing the rotary shear valve to precisely open or close the liquid supply line. Combined with a stepper motor, it further achieves precise step angle control and automated remote operation, improving the valve's adjustment accuracy, drive reliability, and system automation level. Furthermore, the planetary gear reducer 12, in conjunction with the stepper motor, can achieve more precise step angle control, further improving the adjustment accuracy and drive reliability of the rotary shear valve.

[0031] Furthermore, the rotary shear valve also includes an encoder and a code reader. The encoder is used to detect the rotation angle of any one or more of the following: the rotating shaft 4, the output shaft of the motor 11, the input shaft of the planetary gear reducer 12, or the output shaft of the planetary gear reducer 12, to indirectly and accurately detect the rotation angle of the rotor 3. The encoder can transmit coded information containing the rotation angle to the code reader, which is used to decode the received coded information so that the user can know the rotation angle of the rotor 3. The encoder and code reader can realize real-time and accurate monitoring and feedback of the rotation angle of the rotor 3, ensuring that the rotor 3 can accurately stop at the preset open or closed position, greatly improving the accuracy and repeatability of flow control. In addition, the detection function of the encoder and code reader helps to realize remote monitoring of valve position, fault diagnosis and predictive maintenance, enhancing the automation level, operational reliability and intelligence of the entire liquid supply system.

[0032] In one embodiment, reference is made to Figure 3As shown, the rotary shear valve also includes multiple pins 13, each pin 13 being simultaneously inserted into the interior of the rotor 3 and the shaft 4 along the axial direction of the rotor 3. The multiple pins 13 establish a rigid torque transmission relationship between the rotor 3 and the shaft 4, effectively preventing relative rotation or circumferential slippage between the rotor 3 and the shaft 4 during operation, ensuring synchronous rotation of the rotor 3 and the shaft 4. Furthermore, the pins 13 also serve a positioning function, reducing the assembly difficulty of the rotor 3 and the shaft 4 and improving their assembly accuracy.

[0033] In one embodiment, reference is made to Figure 2 As shown, the central axis of the first inlet hole 101 coincides with the central axis of the valve head 1. Multiple first outlet holes 102 are provided and arranged around the first inlet hole 101. These multiple first outlet holes 102 are generally used to connect to different terminal actuators or reaction devices. The central axis of the second inlet hole 201 coincides with the central axis of the stator 2. Multiple second outlet holes 202 are provided and arranged around the second inlet hole 201. These multiple second outlet holes 202 are interconnected with the multiple first outlet holes 102 in a one-to-one correspondence. The liquid delivery tank 301 on the rotor 3 can be controllably connected to any one of the second outlet holes 202. It should be noted that when the liquid delivery tank 301 is connected to a certain second outlet hole 202, it generally does not connect to other second outlet holes 202. This design integrates a single inlet channel with multiple circumferentially distributed outlet channels. By rotating rotor 3, the liquid flowing in from the center can be selectively distributed to different outlet channels, realizing selective fluid control of multiple downstream branches by a single valve. This greatly simplifies the pipeline structure of the multi-way distribution system and improves the space utilization and integration of the entire liquid supply system.

[0034] In one embodiment, reference is made to Figure 1 As shown, the rotary shear valve also includes a PCB board 14, which integrates a motor 11 drive module, a motor 11 control module, analog input / output, digital input / output, a communication interface module, and other functional modules. These modules provide precise control and feedback on the operating status of the rotary shear valve. The highly integrated PCB board 14 enables intelligent control of the rotary shear valve, improving control accuracy, response speed, and anti-interference capabilities. It also facilitates status monitoring, fault diagnosis, and remote communication of the rotary shear valve, enhancing the reliability and automation of the entire liquid supply system.

[0035] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rotary shear valve, characterized in that, The rotary shear valve includes: The valve head (1) has a first liquid inlet (101) and a first liquid outlet (102) that are disposed through the valve. The stator (2) is fixed in position and fits against the valve head (1). The stator (2) has a second inlet hole (201) that is through and communicates with the first inlet hole (101), and a second outlet hole (202) that is through and communicates with the first outlet hole (102). The rotor (3) is located on the side of the stator (2) away from the valve head (1) and is in close contact with the stator (2). The side of the rotor (3) facing the stator (2) is provided with a delivery tank (301) that communicates with the second inlet hole (201). The delivery tank (301) can be controlled to communicate with or not communicate with the second outlet hole (202) during the rotation of the rotor (3). A rotating shaft (4) is located on the side of the rotor (3) away from the stator (2) and is used to drive the rotor (3) to rotate; The elastic element (5) is configured to enable the rotating shaft (4) to have a tendency to move toward the stator (2).

2. The rotary shear valve according to claim 1, characterized in that, The rotating shaft (4) includes a support portion (401) and a shaft portion (402) arranged coaxially. The diameter of the support portion (401) is larger than the diameter of the shaft portion (402) and is used to connect the rotor (3). The elastic member (5) is fitted onto the shaft portion (402) and abuts against the support portion (401) on the side away from the rotor (3).

3. The rotary shear valve according to claim 2, characterized in that, The rotary shear valve also includes a stator support ring (6) connected to the valve head (1) and used to fix the stator (2), and a protective shell (7) disposed on the side of the stator support ring (6) away from the valve head (1), wherein the abutment (401) and the elastic member (5) are located inside the protective shell (7).

4. The rotary shear valve according to claim 3, characterized in that, The rotary shear valve also includes a thrust ball bearing (8) disposed in the protective shell (7), with the two ends of the thrust ball bearing (8) respectively abutting against the elastic element (5) and the inner wall of the protective shell (7).

5. The rotary shear valve according to claim 3, characterized in that, The rotary shear valve also includes a deep groove ball bearing (9) housed in a protective shell (7), and the abutment part (401) is fitted inside the deep groove ball bearing (9).

6. The rotary shear valve according to claim 4, characterized in that, The rotary shear valve also includes a retaining ring (10) disposed in the protective housing (7), the retaining ring (10) abutting against the side of the deep groove ball bearing (9) near the rotor (3).

7. The rotary shear valve according to claim 1, characterized in that, The rotary shear valve also includes a motor (11) for driving the rotating shaft (4) to rotate, and a planetary gear reducer (12) connected between the motor (11) and the rotating shaft (4).

8. The rotary shear valve according to claim 7, characterized in that, The rotary shear valve also includes an encoder and a code reader. The encoder is used to detect the rotation angle of any one or more of the following: the rotating shaft (4), the output shaft of the motor (11), the input shaft of the planetary gear reducer (12), or the output shaft of the planetary gear reducer (12), and transmits the encoded information containing the rotation angle to the code reader. The code reader is used to decode the encoded information it receives.

9. The rotary shear valve according to claim 1, characterized in that, The rotary shear valve also includes a plurality of pins (13) inserted along the axial direction of the rotor (3) into the rotor (3) and the shaft (4).

10. The rotary shear valve according to claim 1, characterized in that, The central axis of the first liquid inlet (101) coincides with the central axis of the valve head (1), and the first liquid outlet (102) is provided in multiple ways and arranged around the first liquid inlet (101); The central axis of the second inlet hole (201) coincides with the central axis of the stator (2). Multiple second outlet holes (202) are provided and arranged around the second inlet hole (201). Multiple second outlet holes (202) are connected to multiple first outlet holes (102) in a one-to-one correspondence. The infusion tank (301) can be controlled to be connected to any one of the second outlet holes (202).

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