A multi-channel sample injection valve

Abstract

The present application relates to a kind of multi-channel sampling valve, which includes: a mounting valve body, the inside of the mounting valve body is coaxially provided with variable speed chamber, detection chamber, switching chamber;A power source is fixedly arranged on one side of the mounting valve body, for providing power;A speed regulating component is detachably inserted into the inside of the variable speed chamber, and the power source can drive the speed regulating component to rotate;A detection component is rotatably arranged in the detection chamber, and is connected with the output end of the speed regulating component, for detecting the angle of rotation;And a switching seat component is rotatably arranged in the inside of the switching chamber, and the speed regulating component can drive the switching seat component to rotate intermittently to switch flow channel.The present application has high design precision, effectively prevents sample leakage and liquid mixing, and is sensitive in operation, so that the sampling accuracy is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of analytical instrument technology, in particular to a multi-channel sampling valve. BACKGROUND

[0002] The sampling valve is one of the key components of liquid sampling of analytical instrument, especially in the field of chromatographic analysis, the sampling valve is used to send the sample into the mobile phase of high pressure liquid flow or to flush different components or to switch between multiple separation systems. As an important part of chromatographic analysis device, the design and manufacturing precision, automation degree and reliability of the sampling valve directly affect the analysis results. However, the existing sampling valve still has the following technical problems:

[0003] 1) Poor pressure resistance, resulting in liquid leakage and liquid mixing;

[0004] 2) When the sampling valve is used, the action sensitivity is poor, and the sampling often fails due to the valve not being in place;

[0005] 3) The motor is easily damaged when the material is stuck.

[0006] Therefore, it is necessary to design a multi-channel sampling valve with good sealing performance, prevention of liquid leakage, long service life and high reliability to solve the above technical problems. SUMMARY

[0007] In order to solve the above technical problems, the present application provides a multi-channel sampling valve with full automatic control, high design precision, effective prevention of sample leakage and mixing, high action sensitivity, high sampling accuracy, long service life and high reliability.

[0008] The technical scheme of the present application is as follows: a multi-channel sampling valve, comprising:

[0009] a mounting valve body, a variable speed cavity, a detection cavity and a switching cavity are coaxially arranged on the inner side of the mounting valve body;

[0010] a power source fixedly arranged on one side of the mounting valve body for providing power;

[0011] a speed regulating component detachably inserted into the inner side of the variable speed cavity, the power source can drive the speed regulating component to rotate;

[0012] a detection component rotatably arranged in the detection cavity and connected with the output end of the speed regulating component for detecting the rotated angle; and

[0013] a switching seat component rotatably arranged in the inner side of the switching cavity, the speed regulating component can drive the switching seat component to rotate intermittently for switching the flow channel;

[0014] The speed regulating component comprises an inner tooth ring and a variable speed wheel group rotatably arranged inside the inner tooth ring.

[0015] The switching seat component comprises coaxially arranged upper cover, compression ring, stator element, rotor element, rotor seat, valve core shaft, bearing element, butterfly spring, shaft sleeve and second bearing element; the upper cover is locked on the installation valve body by the compression ring; the upper cover, stator element, rotor element and rotor seat are connected by the first positioning pin; the rotor seat is inserted into one end of the valve core shaft; the butterfly spring is symmetrically arranged on the valve core shaft; piezoelectric ceramic sheets are attached to the upper and lower sides of the stator element and rotor element; when switching, an electric circuit controls the piezoelectric ceramic sheets to generate an electric field to make them shrink, so as to facilitate the rotation of the rotor element driven by the power source to switch; when stabilizing, an electric circuit controls the piezoelectric ceramic sheets to generate an opposite electric field to make them expand, so as to ensure the sealing connection between the upper cover, stator element and rotor element.

[0016] The rotor element is provided with a first long strip-shaped switching groove; the upper cover is centrally provided with a feed flow channel; at least 10 inclined discharge channels are arranged in a circular array along the circumferential side of the feed flow channel; the valve core shaft is provided with a first annular groove; a telescopic and deformable spacer sleeve is sleeved on the first annular groove, and the spacer sleeve is in sealing contact with the inner side of the detection cavity.

[0017] The inner tooth ring is symmetrically provided with arc-shaped convex portions on the circumferential side; the inner side of the inner tooth ring is provided with a cavity for accommodating the variable speed wheel group; and a bottom plate is inserted into one side of the inner tooth ring.

[0018] The variable speed wheel group comprises an upper tooth disc; a first gear is arranged in a circular array on one side of the upper tooth disc, and a second gear is arranged in a circular array on the other side of the upper tooth disc; a motor gear is engaged in the central position of the circular array of the first gear; and a rotating gear is engaged in the central position of the circular array of the second gear.

[0019] The rotating gear is centrally provided with a receiving cavity; the inner side surface of the receiving cavity is coated with an insulating layer; the receiving cavity is filled with electrorheological fluid; electrodes are oppositely arranged on the inner walls of the two sides of the receiving cavity; an external circuit applies a strong electric field to the electrorheological fluid through the electrodes; and one end of the switching seat component is inserted into the electrorheological fluid; when electrified, the electrorheological fluid solidifies, and at this time the power source drives the switching seat component to rotate through the variable speed wheel group to complete the switching.

[0020] When the switching seat component is made of metal, it can be selected as the positive electrode or negative electrode in the electrode.

[0021] The power source is a servo motor; and the servo motor is fixedly arranged on the installation valve body by a fastener.

[0022] The detection component comprises an encoder and a light sensor; the encoder is fixed on the valve core shaft in the switching seat component through a snap ring; and the light sensor is inserted into the installation valve body and extends into the detection cavity.

[0023] The multi-channel sampling valve further comprises a control module, which is insulatedly connected with the installation valve body; and the control module is electrically connected with the power source, the speed regulating component, the detection component and the switching seat component.

[0024] Compared with the prior art, the multi-channel sampling valve has the following beneficial effects:

[0025] 1) The multi-channel sampling valve provided by the application controls the power source to rotate by the control module, drives the switching seat component, and specifically, the liquid flow path is switched by driving the rotor element to rotate relative to the stator element during the rotation process, the design precision is effectively improved, sample leakage and liquid mixing are effectively prevented, the action is sensitive, the sampling precision is high, and of course, in order to improve the service life, the important stator element and rotor element in the application adopt face contact sealing cooperation and are not easy to be damaged, the wear resistance is improved, and the stator element and rotor element are made of ceramic, so that the long service life is effectively realized, specifically, up to 5000000 times of continuous switching;

[0026] 2) The multi-channel sampling valve provided by the application is provided with a plane thrust ball bearing and a disc spring in the valve body, the disc spring interacts with the rotating shaft and the plane thrust ball bearing to provide support compression force for the rotating shaft, thereby compressing the rotor, realizing dynamic sealing of the rotor and the stator, and then the on-off of the piezoelectric ceramic sheet controlled by the circuit controls the axial deformation of the piezoelectric ceramic sheet, so that the static sealing effect between the stator element, the upper cover and the rotor element is better, and sample leakage and liquid mixing are further effectively prevented;

[0027] 4) The multi-channel sampling valve provided by the application is positioned by the detection component, specifically, the encoder is fixed on the valve core shaft in the switching seat component through a snap ring, and the light sensor is inserted into the installation valve body and extends into the detection cavity, the encoder and the light sensor are used to detect the rotation angle and direction of the motor, and then the rotation angle and direction of the motor can be accurately controlled through the control module and the detection component, so that the flow path switching control has high precision and high sensitivity;

[0028] 5) the application is by in the rotating gear is centrally provided with a containing cavity; the containing cavity inside surface is coated with an insulating layer; the containing cavity is filled with electrorheological fluid; the two sides of the containing cavity are provided with electrodes on the inner wall, and an external circuit applies a strong electric field to the electrorheological fluid through the electrodes; one end of the switching seat component is inserted into the electrorheological fluid, specifically, when electrified, the electrorheological fluid solidifies, at this time, the power source drives the switching seat component to rotate through the gear set to complete the switching; when the switching seat component is stuck during rotation, the control module will immediately stop supplying power to the electrorheological fluid, and the electrorheological fluid returns to liquid state instantaneously, at this time, the switching seat component stops rotating, and the power source continues to rotate, ensuring that the motor will not be damaged; further improve the service life;

[0029] 6) the application is by in the rotating gear is centrally provided with a containing cavity, the containing cavity is filled with electrorheological fluid; so that when switching in place, the switching seat component can be immediately stopped rotating by cutting off the power supply, preventing the rotation angle from being too large due to inertia, and further improving the use precision. BRIEF DESCRIPTION OF DRAWINGS

[0030] To further illustrate the embodiments, the application provides accompanying drawings. These drawings are part of the disclosure of the application, mainly used to illustrate the embodiments, and can be used to explain the operating principle of the embodiments in conjunction with the related description of the specification. Those skilled in the art should be able to understand other possible implementations and advantages of the application by referring to these contents. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0031] Fig. 1 It is an explosion schematic view of the multi-channel sample injection valve of the application;

[0032] Fig. 2 It is an explosion schematic view of the speed regulating component of the application;

[0033] Fig. 3 It is a front view of the rotating gear of the application;

[0034] Fig. 4 It is a circuit principle diagram of the control module of the application. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the application will be described clearly and completely below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0036] For those skilled in the art of the technical field, the present application will be better understood below with the help of the drawings and specific embodiments.

[0037] Referring to Figs. 1 to 4 A multi-channel sampling valve, comprising: a mounting valve body 1, a power source 2, a speed regulating component 3, a detection component 5, a switching seat component 4. Wherein: the inside of the mounting valve body 1 is coaxially provided with a cylindrical variable speed cavity 11, a detection cavity 12, and a switching cavity 13, which are used to provide support for the installation of the power source 2, the speed regulating component 3, the detection component 4, and the switching seat component 5; the mounting valve body 1 includes a first connection part in the shape of a square; the first connection part has a ring-shaped protruding part extending outward on one side; the first connection part is provided with an internally recessed sensor mounting groove; the power source 2 is fixedly arranged inside the first connection part of the mounting valve body, used to provide the power required for switching; the speed regulating component 3 is detachably inserted inside the variable speed cavity, used to reduce the speed of high-speed output for subsequent switching control; the power source 2 can drive the speed regulating component 3 to rotate; the detection component 5 is rotatably arranged in the detection cavity 12 and connected with the output end of the speed regulating component 3, used to detect the angle of rotation; the switching seat component 4 is rotatably arranged inside the switching cavity 13, and the speed regulating component 3 can drive the switching seat component 4 to rotate intermittently to switch the flow path; during operation, when the switching is in place, the element in the switching seat component is deformed axially outward to improve the sealing effect by being energized, and when switching, the element is deformed axially inward by applying a reverse voltage to increase the gap between them and facilitate switching. The power source is controlled to rotate by a control module, which drives the switching seat component. Specifically, during rotation, the rotor element and the stator element are relatively rotated to achieve switching of the liquid flow path, which effectively improves the design precision, effectively prevents sample leakage and liquid mixing, and makes the sampling accurate.

[0038] On the basis of the above-mentioned embodiment, the switching seat component 4 comprises coaxially arranged upper cover 41, compression ring 42, stator element 43, rotor element 44, rotor seat 45, valve core shaft 46, bearing element 47, disc spring 48, shaft sleeve 49 and second bearing element 410; the upper cover 41 is locked on the installation valve body 1 through the compression ring 42; the upper cover 41, the stator element 43, the rotor element 44 and the rotor seat 45 are connected by the first positioning pin; the rotor seat 45 is inserted into one end of the valve core shaft 46; the valve core shaft 46 is symmetrically arranged and sleeved on the disc spring 48; the stator element 43 and the rotor element 44 are closely attached with piezoelectric ceramic sheets 7 on the upper and lower sides; when switching, a circuit controls the piezoelectric ceramic sheet 7 to generate an electric field to make it shrink, so as to facilitate the rotation of the rotor element driven by the power source; when stabilizing, a circuit controls the piezoelectric ceramic sheet 7 to generate an opposite electric field to make it expand, so as to ensure the sealing connection between the upper cover, the stator element and the rotor element. In this embodiment, the valve body is provided with bearing element 47 (plane thrust ball bearing) and disc spring, the disc spring interacts with the rotating shaft and the plane thrust ball bearing to provide support compression force for the rotating shaft, thereby compressing the rotor, realizing dynamic sealing of the rotor and the stator, and then controlling the on-off of the piezoelectric ceramic sheet through the circuit to control the axial deformation of the piezoelectric ceramic sheet, so that the static sealing effect between the stator element, the upper cover and the rotor element is better, further effectively preventing sample liquid leakage and liquid mixing. Of course, in order to improve the service life, the important stator element and rotor element in the application adopt face contact sealing cooperation, which is not easy to be damaged, improves the wear resistance, and is made of ceramic, effectively realizes long service life, specifically up to 5000000 times of continuous switching.

[0039] On the basis of the above-mentioned embodiment, the upper cover 41 is centrally provided with a feeding flow channel; at least 10 inclined discharge channels are arranged in a circular array on the circumferential side of the feeding flow channel; the rotor element 44 is provided with a first long strip-shaped switching groove which is concave but not through, for connecting different discharge channels and feeding flow channels; the valve core shaft 46 is provided with a first annular groove; a telescopic deformation spacer sleeve is sleeved on the first annular groove; the spacer sleeve is in sealing contact with the inner side of the detection cavity, so as to ensure the sealing property during work.

[0040] On the basis of the above-mentioned embodiment, the speed regulating component 3 comprises an inner tooth ring 31 and a variable speed wheel group 32 rotatably arranged on the inner side of the inner tooth ring. The circumferential side of the inner tooth ring 31 is symmetrically provided with arc-shaped convex parts for positioning and preventing rotation during work; the inner side of the inner tooth ring 31 is provided with a cavity for accommodating the variable speed wheel group 32; one side of the inner tooth ring 31 is provided with a bottom plate 311 for protecting the variable speed wheel group 32 from falling off.

[0041] On the basis of the above-mentioned embodiment, the variable speed wheel set 32 comprises an upper tooth disc 321; the upper tooth disc 321 is provided with a first gear 322 on one side of the circumference and a second gear 323 on the other side of the circumference; the centrally located first gear of the circumferential array is provided with a motor gear 324; the centrally located second gear of the circumferential array is provided with a rotating gear 325.

[0042] On the basis of the above-mentioned embodiment, the rotating gear 325 is centrally provided with a containing cavity 8; the inner surface of the containing cavity 8 is coated with an insulating layer 81; the inner side of the containing cavity 81 is filled with electrorheological fluid 82; the inner walls on both sides of the containing cavity 81 are oppositely provided with electrodes 83, and an external circuit applies a strong electric field to the electrorheological fluid through the electrodes 83; one end of the switching seat component 4 is inserted into the electrorheological fluid; when electrified, the electrorheological fluid solidifies, and at this time, the power source drives the switching seat component to rotate through the variable speed wheel set to complete the switching. In this embodiment, a containing cavity is centrally provided in the rotating gear; the inner surface of the containing cavity is coated with an insulating layer; the inner side of the containing cavity is filled with electrorheological fluid; the inner walls on both sides of the containing cavity are oppositely provided with electrodes, and an external circuit applies a strong electric field to the electrorheological fluid through the electrodes; one end of the switching seat component is inserted into the electrorheological fluid, specifically, when electrified, the electrorheological fluid solidifies, and at this time, the power source drives the switching seat component to rotate through the variable speed wheel set to complete the switching; when the switching seat component stops rotating during the rotating process, the control module will immediately stop supplying power to the electrorheological fluid, and the electrorheological fluid instantly returns to a liquid state, at which time the switching seat component stops rotating, and the power source continues to rotate, ensuring that the motor will not be damaged; the service life is further improved.

[0043] On the basis of the above-mentioned embodiment, when the switching seat component is made of metal, it can be selected as the positive electrode or the negative electrode in the electrodes.

[0044] On the basis of the above-mentioned embodiment, the power source 2 is a servo motor; the servo motor is fixedly arranged on the mounting valve body through fasteners. Of course, in other embodiments, the power source 2 can also be a hydraulic type or a pneumatic type or other rotary motion mechanical structure, which is not limited in this embodiment.

[0045] On the basis of the above-mentioned embodiment, the detection component 5 comprises an encoder 51 and a light sensor 52; the encoder 51 is fixedly arranged on the valve core shaft in the switching seat component 4 through a snap ring; the light sensor 52 is inserted into the mounting valve body and extends into the inside of the detection cavity. By arranging the detection component for positioning, specifically, the encoder is fixedly arranged on the valve core shaft in the switching seat component through a snap ring, and the light sensor is inserted into the mounting valve body and extends into the inside of the detection cavity; in use, the encoder and the light sensor cooperate to detect the rotating angle and direction of the motor, and then the control module and the detection component can accurately control the rotating angle and direction of the motor, thereby realizing high precision and high sensitivity of flow path switching control.

[0046] On the basis of the above-mentioned embodiment, the multi-channel sampling valve further comprises a control module 9, which is connected with the installation valve body in an insulating manner; the control module is connected with the power source, the speed regulating component, the detection component and the switching seat component in an electrical manner.

[0047] In summary, the cooperation of the components of the present application improves the design precision, prevents sample liquid leakage and liquid mixing, and is sensitive in action, so that the sampling precision is high.

[0048] The above-mentioned is only the embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and the drawings, or direct or indirect application in other related technical fields, is also included in the patent protection range of the present application.

Claims

1. A multi-channel sample injection valve characterized by: The multi-channel sampling valve comprises: a valve body, which is coaxially provided with a variable speed cavity, a detection cavity and a switching cavity inside; a power source, which is fixedly arranged on one side of the valve body and used for providing power; a speed regulating component, which is detachably inserted into the variable speed cavity and can be driven to rotate by the power source; a detection component, which is rotatably arranged in the detection cavity and connected with the output end of the speed regulating component and used for detecting the rotated angle; and a switching seat component, which is rotatably arranged inside the switching cavity and can be intermittently driven to rotate by the speed regulating component to switch the flow channel. The speed regulating component comprises an inner tooth ring and a variable speed wheel group rotatably arranged inside the inner tooth ring. The switching seat component comprises a coaxially arranged upper cover, a compression ring, a stator element, a rotor element, a rotor seat, a valve core shaft, a bearing element, a butterfly spring, a shaft sleeve and a second bearing element; the upper cover is locked on the valve body by the compression ring; the upper cover, the stator element, the rotor element and the rotor seat are connected by a first positioning pin; the rotor seat is inserted into one end of the valve core shaft; the butterfly spring is symmetrically arranged on the valve core shaft; piezoelectric ceramic sheets are closely attached to the upper and lower sides of the stator element and the rotor element; during switching, an electric field is generated in the piezoelectric ceramic sheets by a circuit to make them shrink, so that the rotor element is driven to rotate by the power source to switch; during stabilization, an opposite electric field is generated in the piezoelectric ceramic sheets by a circuit to make them expand, so as to ensure the sealing connection between the upper cover, the stator element and the rotor element.

2. The multi-channel sample introduction valve of claim 1, wherein: The rotor element is provided with a first long strip-shaped switching groove; the upper cover is centrally provided with a feeding flow channel; at least 10 inclined discharging channels are circumferentially arranged on the periphery of the feeding flow channel; the valve core shaft is provided with a first annular groove; a telescopic and deformable spacer sleeve is sleeved on the first annular groove and sealingly contacts the inside of the detection cavity.

3. The multi-channel sample introduction valve of claim 1, wherein: The periphery of the inner tooth ring is symmetrically provided with arc-shaped convex parts; the inside of the inner tooth ring is provided with a cavity for accommodating the variable speed wheel group; and a bottom plate is inserted into one side of the inner tooth ring.

4. The multi-channel sample introduction valve of claim 3, wherein: The variable speed wheel group comprises an upper tooth disc; a first gear is circumferentially arranged on one side of the upper tooth disc, and a second gear is circumferentially arranged on the other side of the upper tooth disc; a motor gear is engaged in the central position of the circumferentially arranged first gear; and a rotating gear is engaged in the central position of the circumferentially arranged second gear.

5. The multi-channel sample introduction valve of claim 4, wherein: The rotating gear is centrally provided with a receiving cavity; the inside surface of the receiving cavity is coated with an insulating layer; the receiving cavity is filled with electrorheological fluid; electrodes are oppositely arranged on the inner walls of the receiving cavity; an external circuit applies a strong electric field to the electrorheological fluid through the electrodes; one end of the switching seat component is inserted into the electrorheological fluid; when electrified, the electrorheological fluid solidifies, and at this time, the power source drives the switching seat component to rotate through the variable speed wheel group to complete the switching.

6. The multi-channel sample introduction valve of claim 5, wherein: When the switching seat component is made of metal, it can be selected as the positive electrode or the negative electrode.

7. The multi-channel sample introduction valve of claim 1, wherein: The power source is a servo motor; the servo motor is fixedly arranged on the valve body by fasteners.

8. The multi-channel sample introduction valve of claim 1, wherein: The detection component includes an encoder and a light sensor; the encoder is fixed on the valve core shaft in the switching seat component by a snap ring; the light sensor is inserted into the detection cavity of the installation valve body.

9. The multi-channel sample introduction valve of claim 1, wherein: The multi-channel sampling valve further comprises a control module, which is connected to the installation valve body in an insulating manner; the control module is connected to the power source, the speed regulating component, the detection component and the switching seat component in an electrical manner.

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