Control device for liquid chromatogram high-pressure switching valve

Abstract

The utility model discloses a control device for a liquid chromatogram high-pressure switching valve, which comprises a fixing frame, a speed reduction module and an induction feedback module, the induction feedback module is sleeved on an output shaft of the speed reduction module, and one end of the speed reduction module far away from the induction feedback module is provided with a power input port; the induction feedback module comprises a baffle plate, an infrared emission plate, a shading plate, a code disc and an infrared receiving plate; the infrared emitting plate, the shading plate, the coded disc and the infrared receiving plate are sequentially arranged from bottom to top, the coded disc is fixedly connected with an output shaft of the speed reduction module, the infrared emitting plate, the shading plate and the infrared receiving plate are fixedly connected with the fixing frame, and a plurality of groove holes are formed in the outer edge of the coded disc according to scales. Sensors used for transmitting and receiving infrared rays are arranged on the infrared transmitting plate and the infrared receiving plate, and through holes corresponding to the slotted holes are formed in the shading plate. According to the control device for the liquid chromatography high-pressure switching valve, signals can be fed back, any relative angle can be positioned, and the stability and the accuracy of the liquid chromatography high-pressure switching valve are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid chromatography analysis instruments, in particular to a control device for a liquid chromatography high-pressure switching valve. Background Art

[0002] With the development and widespread application of liquid chromatography technology, the requirements for its analysis accuracy, stability and repeatability are getting higher and higher. The high-pressure switching valve is one of the important components of liquid chromatographs. Its performance directly affects the analysis results and has a significant impact on liquid chromatography analysis.

[0003] At present, high-pressure switching valves generally include an application device, a control device and a drive device. The existing control structure is as follows: Figure 6 , Figure 7 As shown, by setting a half disc on the side of the support shaft, and setting a sensor on the same horizontal plane as the half disc, when working, the half disc follows the support shaft to rotate into the sensing groove of the sensor, and by judging that the edge of the half disc passes through the sensor, the sensor generates an electrical signal 0-1 or 1-0 change. According to the above prior art, after rotation, there is no feedback on whether the specified position is reached, and only one 0 point position can be determined after one rotation, and the structural processing of the support shaft is difficult.

[0004] Therefore, it is very necessary to develop a high-pressure switching valve whose control device can feedback signals and position the valve core shaft at any rotation angle. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a control device for a liquid chromatography high-pressure switching valve that can feedback signals and locate any rotation angle of the valve core shaft, thereby improving the stability and accuracy of the liquid chromatography high-pressure switching valve.

[0006] The technical solution of the utility model is: a control device for a liquid chromatography high-pressure switching valve, comprising a fixed frame; also comprising a deceleration module and an inductive feedback module, the inductive feedback module is sleeved on the output shaft of the deceleration module, and a power input port is provided at one end of the deceleration module away from the inductive feedback module; the inductive feedback module comprises a baffle, an infrared emitting plate, a shading plate, a code disk and an infrared receiving plate; the infrared emitting plate, the shading plate, the code disk and the infrared receiving plate are arranged in sequence from bottom to top, the code disk is fixedly connected to the output shaft of the deceleration module, the infrared emitting plate, the shading plate and the infrared receiving plate are fixedly connected to the fixed frame, the outer edge of the code disk is provided with a plurality of slots according to scales, the infrared emitting plate and the infrared receiving plate are provided with sensors for emitting and receiving infrared rays, and the shading plate is provided with through holes corresponding to the slots.

[0007] Preferably, the reduction module includes an inner ring gear, planetary gears, a planetary carrier and a bearing, the inner ring gear is fixedly connected to the inner wall of the fixed frame, the multiple planetary gears are rotatably connected to the planetary carrier, and the planetary gears are meshed with the inner ring gear, the output shaft is located at the center of a side of the planetary carrier away from the planetary gears, and a bearing is provided between the planetary carrier and the fixed frame.

[0008] Preferably, a baffle is provided between the inductive feedback module and the deceleration module to separate the deceleration module from the feedback module.

[0009] Preferably, a transmission groove is provided at one end of the output shaft away from the planetary carrier for transmission connection to a valve core of a high-speed switching valve.

[0010] Preferably, a corrugated washer is provided between the bearing and the inductive feedback module to provide an axial elastic preload force for the output shaft 14 .

[0011] Preferably, an end of the fixing frame close to the output shaft is provided with an end cover, and the end cover is provided with an output hole corresponding to the output shaft to reduce impurities such as dust from entering the control device.

[0012] Preferably, at least two connection holes are provided on the end cover and the fixing frame, which are used for matching, positioning and connecting the control device when connecting the drive motor and the switching valve.

[0013] Preferably, a cavity is provided between the fixing frame, the infrared receiving board and the end cover, and a wire outlet communicating with the cavity is provided on the side of the fixing frame to facilitate the routing of power supply wires and signal transmission wires of the sensor.

[0014] Preferably, a fixing hole is provided on the side of the fixing frame, and the fixing hole and the planetary gear are in the same horizontal plane.

[0015] A high-pressure switching valve comprises any one of the control devices described above. Other structures of the high-pressure switching valve may be existing technologies.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] The utility model provides a control device for a liquid chromatography high-pressure switching valve, comprising a fixed frame; a deceleration module and an inductive feedback module, the inductive feedback module is sleeved on the output shaft of the deceleration module, and a power input port is provided at one end of the deceleration module away from the inductive feedback module; the inductive feedback module comprises a baffle, an infrared emitting plate, a shading plate, a code disc and an infrared receiving plate; the code disc is fixedly connected to the output shaft of the deceleration module, the infrared emitting plate, the shading plate and the infrared receiving plate are fixedly connected to the fixed frame, the outer edge of the code disc is evenly provided with a plurality of slots, the infrared emitting plate and the infrared receiving plate are provided with sensors for emitting and receiving infrared rays, and the shading plate is provided with through holes corresponding to the slots. When the power of the deceleration module is connected, the code disc will rotate with the output shaft, and during the rotation process, the outer edge of the code disc will intermittently block the infrared rays emitted from the infrared emitting plate to the infrared receiving plate, and the evenly set slots can represent the rotation angle of the code disc, so that the rotation angle of the output shaft can be judged and determined according to the number of times the infrared rays are blocked, so as to achieve precise positioning and improve the stability and accuracy of the liquid chromatography high-pressure switching valve connected to the output shaft.

[0018] The detailed structure of the present utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the overall structural diagram of the control device;

[0020] Figure 2 It is a schematic diagram of the structure explosion of the control device;

[0021] Figure 3 is a cross-sectional view of the control device;

[0022] Figure 4 is a top view of the control device;

[0023] Figure 5 is a bottom view of the control device;

[0024] Figure 6 It is a structural schematic diagram of the prior art;

[0025] Figure 7 A cross-sectional view of the prior art;

[0026] Names and serial numbers of components: 1. Fixed frame; 2. Internal gear ring; 3. First bearing; 4. Planetary gear; 5. Planetary carrier; 6. Baffle; 7. Infrared emitting board; 8. Shading plate; 9. Code disk; 10. Infrared receiving board; 11. Corrugated washer; 12. Second bearing; 13. End cover; 14. Output shaft; 15. Connecting hole; 16. Fixing hole; 17. Chamber; 18. Wire outlet; 19. Transmission slot; 20. Power input port; 21. Prior art support shaft; 22. Prior art sensor. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. The following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-Figure 5 A control device for a liquid chromatography high-pressure switching valve comprises a fixing frame 1; a deceleration module and an inductive feedback module, the inductive feedback module is sleeved on the output shaft 14 of the deceleration module, and a power input port 20 is provided at one end of the deceleration module away from the inductive feedback module; the inductive feedback module comprises an infrared emitting plate 7, a shading plate 8, a code disc 9 and an infrared receiving plate 10; the infrared emitting plate 7, the shading plate 8, the code disc 9 and the infrared receiving plate 10 are stacked in sequence, the code disc 9 is fixedly connected to the output shaft 14 of the deceleration module, the infrared emitting plate 7, the shading plate 8 and the infrared receiving plate 10 are fixedly connected to the fixing frame 1, a plurality of slots are evenly provided on the outer edge of the code disc 9, sensors for emitting and receiving infrared rays are provided on the infrared emitting plate 7 and the infrared receiving plate 10, and through holes corresponding to the slots are provided on the shading plate 8. When the power of the deceleration module is connected, the code disk 9 will rotate with the output shaft 14. During the rotation, the outer edge of the code disk 9 will intermittently block the infrared rays emitted from the infrared emitting plate 7 to the infrared receiving plate 10, and the evenly arranged slots can represent the rotation angle of the code disk 9. The number of slots corresponds to the number holes on the switching valve and the selection valve, so that it can be compatible with multiple even-numbered number holes such as 6 / 10 / 12, and the corresponding positions of multiple number holes can be determined at the same time, so that the rotation angle of the output shaft 14 can be judged and determined according to the number of times the infrared rays are blocked, so as to achieve precise positioning and improve the stability and accuracy of the liquid chromatography high-pressure switching valve connected to the output shaft 14. The shading plate 8 is used to block excess light beams to prevent the infrared rays scattered by the infrared emitting plate 7 from affecting the sensing and recognition of the infrared receiving plate 10; at the same time, the output shaft of the utility model is an optical axis, which reduces the processing difficulty and cost of the output shaft.

[0029] Specifically, the reduction module comprises an inner gear ring 2, a plurality of planetary gears 4, a planetary carrier 5 and a bearing. The inner gear ring 2 is fixedly connected to the inner wall of the fixed frame 1. The plurality of planetary gears 4 are rotatably connected to the planetary carrier 5, and the planetary gears 4 are meshed with the inner gear ring 2. The output shaft 14 is fixedly connected to the center of the side of the planetary carrier 5 away from the planetary gears 4. A bearing is arranged between the planetary carrier 5 and the fixed frame 1, and the bearing comprises a first bearing 3 and a second bearing 12. A gear that can mesh with each planetary gear at the same time needs to be sleeved on the driving shaft of the driving motor so that the reduction module can be connected from the power input port 20. The control accuracy of the control device is improved and the volume and weight of the control device are optimized by the high transmission ratio, high space utilization and light weight of the planetary gear set. In this embodiment, the output shaft (14) and the planetary carrier (5) are an integrated structure, and in this embodiment, there are three planetary gears 4. Among them, the first bearing 3 and the second bearing 12 are both thrust bearings.

[0030] Specifically, a baffle 6 is provided between the sensing feedback module and the deceleration module to separate the deceleration module from the feedback module and prevent the grease in the deceleration module from flowing into the feedback module and affecting the sensing accuracy.

[0031] Specifically, a transmission groove 19 is provided at one end of the output shaft 14 away from the planet carrier 5 for transmission connection to a valve core of the high-speed switching valve.

[0032] Specifically, a corrugated washer 11 is provided between the second bearing 12 and the inductive feedback module to provide an axial elastic preload force for the output shaft 14 to prevent the output shaft 14 from shaking and generating a gap when rotating.

[0033] Specifically, an end of the fixing frame 1 close to the output shaft 14 is provided with an end cover 13, and an output hole corresponding to the output shaft 14 is provided on the end cover 13; the end cover 13 can reduce impurities such as dust from entering the control device to affect the recognition process of its sensor.

[0034] Specifically, at least two connection holes 15 are provided on the end cover 13 and the fixing frame 1. The connection holes 15 are reserved for the assembly of the whole machine, and are specifically used for matching, positioning and connecting the control device when connecting the drive motor and the switching valve. At least two countersunk holes are provided on the end cover 13 and the fixing frame 1, and the countersunk holes are used to connect the end cover 13 and the fixing frame 1 (to form modularization).

[0035] Specifically, a chamber 17 is provided between the fixing frame 1 and the infrared receiving board 10 and the end cover 13, and a wire outlet 18 communicating with the chamber 17 is provided on the side of the fixing frame 1; the function of the chamber 17 is to facilitate the routing of the power supply wires and signal transmission wires of the sensor.

[0036] Specifically, a fixing hole 16 is provided on the side of the fixing frame 1, and the fixing hole 16 and the planetary gear 4 are in the same horizontal plane; a set screw can be screwed into the fixing hole 16 to fix the inner gear ring to prevent the gear ring from moving when the tolerance is too large.

[0037] Description of the working process: The control device is installed in the high-pressure switching valve to feedback and control the rotation angle of the motor. The driving motor of the high-pressure switching valve is connected to the output shaft 14, which transmits power to the deceleration module, outputs torque to the switching valve spool through the output shaft 14, and determines the rotation angle through the code disk 9 installed on the output shaft 14, and generates a feedback signal to determine the position. During the rotation process, the outer edge of the code disk 9 will intermittently block the infrared rays emitted from the infrared emitting plate 7 to the infrared receiving plate 10, and the evenly arranged slots can represent the rotation angle of the code disk 9, so that the rotation angle of the output shaft 14 can be judged and determined according to the number of times the infrared rays are blocked, so as to achieve precise positioning and improve the stability and accuracy of the valve core of the liquid chromatography high-pressure switching valve connected to the output shaft 14.

[0038] The above is a specific implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the utility model according to the technical solution and concept of the utility model, which should be covered by the protection scope of the claims of the utility model.

Claims

1. A control device for a liquid chromatography high pressure switching valve, comprising a fixing frame (1); Features: The invention also comprises a deceleration module and an inductive feedback module, wherein the inductive feedback module is sleeved on the output shaft (14) of the deceleration module, and a power input port (20) is provided at one end of the deceleration module away from the inductive feedback module; the inductive feedback module comprises an infrared emitting plate (7), a shading plate (8), a code disc (9) and an infrared receiving plate (10); the infrared emitting plate (7), the shading plate (8), the code disc (9) and the infrared receiving plate (10) are arranged in sequence from bottom to top, the code disc (9) is fixedly connected to the output shaft (14) of the deceleration module, the infrared emitting plate (7), the shading plate (8) and the infrared receiving plate (10) are fixedly connected to the fixing frame (1), a plurality of slots are evenly provided on the outer edge of the code disc (9), sensors for emitting and receiving infrared rays are provided on the infrared emitting plate (7) and the infrared receiving plate (10), and through holes corresponding to the slots are provided on the shading plate (8).

2. A control device for a liquid chromatography high pressure switching valve according to claim 1, Features: The reduction module comprises an inner gear ring (2), planetary gears (4), a planetary carrier (5) and a bearing, wherein the inner gear ring (2) is fixedly connected to the inner wall of the fixed frame (1), the plurality of planetary gears (4) are rotatably connected to the planetary carrier (5), and the planetary gears (4) are meshed with the inner gear ring (2), the output shaft (14) is located at the center of a side of the planetary carrier (5) away from the planetary gears (4), and a bearing is provided between the planetary carrier (5) and the fixed frame (1).

3. A control device for a liquid chromatography high pressure switching valve according to claim 1 or 2, Features: A baffle (6) is provided between the inductive feedback module and the deceleration module.

4. A control device for a liquid chromatography high pressure switching valve according to claim 2, Features: A transmission groove (19) is provided at one end of the output shaft (14) away from the planet carrier (5).

5. A control device for a liquid chromatography high pressure switching valve according to claim 2, Features: A corrugated washer (11) is provided between the bearing and the inductive feedback module.

6. A control device for a liquid chromatography high pressure switching valve according to claim 1 or 2, Features: An end cover (13) is provided at one end of the fixing frame (1) close to the output shaft (14), and an output hole corresponding to the output shaft (14) is provided on the end cover (13).

7. A control device for a liquid chromatography high pressure switching valve according to claim 6, Features: At least two connection holes (15) are provided on the end cover (13) and the fixing frame (1).

8. A control device for a liquid chromatography high pressure switching valve according to claim 1 or 2, Features: A chamber (17) is provided between the fixing frame (1), the infrared receiving plate (10) and the end cover (13), and a wire outlet (18) communicating with the chamber (17) is provided on a side surface of the fixing frame (1).

9. A control device for a liquid chromatography high pressure switching valve according to claim 2, Features: A fixing hole (16) is provided on the side of the fixing frame (1), and the fixing hole (16) and the planetary gear (4) are located at the same horizontal plane.

10. A high pressure switching valve, Features: The invention comprises the control device as described in any one of claims 1 to 9.

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