CN216344083U

CN216344083U - High-precision liquid rotary valve component capable of conveying micro-flow

Info

Publication number: CN216344083U
Application number: CN202123270759.6U
Authority: CN
Inventors: 柳和生; 匡唐清; 罗杰; 胡礼彬; 张庆伟
Original assignee: East China Jiaotong University
Current assignee: East China Jiaotong University
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-04-19
Anticipated expiration: 2031-12-23

Abstract

The utility model relates to a high-precision liquid rotary valve component capable of conveying micro-flow, wherein a movable valve plate and a fixed valve plate are sealed through a tool, in order to ensure the sealing reliability, a valve body is designed to be a taper angle of 2-4 degrees, and the movable valve plate and a valve shaft are integrally processed. The fixed valve plate is externally provided with a bolt pin which is directly connected with the working platform. The rotating ring transmission part is connected with the motor shaft through a key, and the rotating ring transmission part is connected with the movable valve plate through a torsion spring. The assembly drives the rotating ring transmission part to synchronously rotate through the stepping motor to enable the torsion spring to deform, the bending moment generated by the deformation of the torsion spring is utilized to overcome the friction moment between the movable valve plate and the fixed valve plate, the flexible transmission of the motor to the movable valve plate is realized, and the accurate positioning of the sampling channel of the movable valve plate, the sample inlet hole of the fixed valve and the sample discharge hole is ensured through the positioning mechanism formed by the limiting pin on the fixed valve plate and the limiting groove on the movable valve plate, so that the sample introduction and sample discharge processes are realized.

Description

High-precision liquid rotary valve component capable of conveying micro-flow

Technical Field

The utility model belongs to the technical field of the measurement valve body and specifically relates to a can carry high-accuracy liquid rotary valve subassembly of miniflow.

Background

The liquid metering is widely used in the fields of modern medicine, chemistry and the like, and the most typical structure of the liquid metering device is that a fixed valve plate and a movable valve plate are combined in a rotating mode to form liquid intercepting channels with different volumes, and meanwhile, the fixed valve and the movable valve are tightly pressed through axial force to achieve the purpose of sealing. The rotation of the valve is generally realized directly through mechanical transmission and the like, the traditional mechanical transmission belongs to rigid transmission, no flexible element absorbs buffer, mechanical damage to the element is easily caused, the service life of the valve is shortened, and although the buffer element can be additionally arranged under the transmission, the structure is complex and the maintenance is difficult.

The other kind of combined flow passage metering valve has the principle that a main valve rod and a fluid metering cavity are combined for use, the position of the main valve rod is different, the communicated fluid metering cavity is different, and the fluid is discharged after metering is finished.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a high-precision liquid rotary valve component capable of conveying micro-flow, which is used for solving the technical problems that the traditional fluid metering valve causes mechanical damage to elements in a valve body and reduces the service life of the valve due to rigid transmission.

In order to achieve the purpose, the utility model adopts the technical scheme that: a high-precision liquid rotary valve assembly capable of delivering micro-flow is provided, which mainly comprises: the device comprises a fixed valve plate, a movable valve plate, a valve cover, a stepping motor, a rotating ring transmission part, a positioning mechanism for positioning the movable valve plate at a sample feeding and sampling position, a valve cover and a shaft end sealing cover. The method is characterized in that: the assembly has a fixed valve plate and a movable valve plate, wherein a bolt foot on the fixed valve plate shell can be arranged on the working platform. The coaxiality and installation of the fixed valve plate and the movable valve plate are positioned by a tool through a structure, and the sealing between the movable valve plate and the fixed valve plate is realized by a conical structure between the movable valve plate and the fixed valve plate and the pretightening force of a bolt between the valve cover and the movable valve plate. The driving motor drives the rotating ring transmission member to rotate through the motor shaft, and the rotating ring transmission member is connected with the movable valve plate through the torsion spring.

The driving motor is a stepping motor, and a key connection is formed between a motor shaft and the rotating ring transmission part.

The rotating ring transmission part is provided with a torsion spring groove for installing a torsion spring.

A torsion spring groove is formed in the connecting side of the movable valve plate and the torsion spring, and the torsion spring is convenient to install and position.

The movable valve plate is in a circular truncated cone shape, and the size of the taper angle is 2-4 degrees.

The movable valve plate is provided with a plurality of measuring ranges of sampling channels, the left side of the movable valve plate is provided with a limiting groove, and the limiting groove is provided with a sampling limiting surface and a stock layout limiting surface.

And the fixed valve plate is provided with a limiting pin which is matched with a limiting groove on the movable valve plate to achieve the limiting purpose.

And the fixed valve plate is provided with a sample feeding channel and a sample discharging channel.

One or more technical solutions described above in the embodiments of the present invention have at least the following technical effects or advantages:

the high-precision liquid rotary valve component capable of conveying micro-flow provided by the embodiment of the utility model comprises a stepping motor, a rotary ring transmission part, a movable valve plate, a fixed valve plate, a valve cover, a torsion spring and a positioning mechanism for positioning the movable valve plate at a sample feeding position and a sample discharging position. The fixed valve plate is provided with a fluid sample inlet and a fluid sample outlet, and the movable valve plate is provided with a sampling channel corresponding to the fluid sample inlet and the fluid sample outlet. The movable valve plate and the fixed valve plate are sealed through a tool, in order to guarantee the sealing reliability of the valve body, the valve body is designed to be in a taper angle of 2-4 degrees, and the movable valve plate and the valve shaft are integrally machined. The fixed valve plate is externally provided with a bolt pin which is directly connected with the working platform. The rotating ring transmission part is connected with the motor shaft through a key, and the rotating ring transmission part is connected with the movable valve plate through a torsion spring. The assembly drives the rotating ring transmission part to synchronously rotate through the stepping motor to enable the torsion spring to deform, the bending moment generated by the deformation of the torsion spring is utilized to overcome the friction moment between the movable valve plate and the fixed valve plate, the flexible transmission of the motor to the movable valve plate is realized, and the accurate positioning of the sampling channel of the movable valve plate, the sample inlet hole of the fixed valve and the sample discharge hole is ensured through the positioning mechanism formed by the limiting pin on the fixed valve plate and the limiting groove on the movable valve plate, so that the sample introduction and sample discharge processes are realized.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is an assembly view of the general structure of the present invention.

Fig. 2 is a cross-sectional view taken along the direction a-a.

Fig. 3 to 6 are schematic views of the sample injection process of the present invention.

Fig. 7 to 10 are schematic views of the sampling process of the present invention.

Fig. 11 to 12 are schematic structural views of the valve sheet according to the present invention.

In the figure: 1. a stepping motor; 2. a swivel drive member; 3. a valve cover; 4. a fixed valve plate; 5. a movable valve plate; 6. a shaft end sealing cover; 7. a torsion spring; 8. a base; 9. a spacing pin; 41. a fluid pumping bore; 42. a sample outlet pump through hole; 43. a fluid pump outlet; 44. a sample discharge hole; 51. a sampling channel; 91. a stock layout limiting surface; 92. and (5) sampling limit surfaces.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 2, the main components of the present invention include a stepping motor 1, a rotating ring transmission member 2, a valve cover 3, a fixed valve plate (outer casing) 4, a movable valve plate 5, a shaft end sealing cover 6, a torsion spring 7, a base 8 and a limit pin 9.

The motor shaft of the stepping motor 1 is connected with the rotating ring transmission part 2 through a key, and the left end of the rotating ring transmission part 2 is provided with a torsion spring groove for installing a torsion spring. A bearing is additionally arranged between the rotating ring transmission piece 2 and the valve cover 3 for positioning the rotating ring transmission piece 2 and reducing the rotating friction. The right side of the bearing is sealed to prevent the lubricating oil in the bearing from entering the working chamber of the valve. The left side of the torsion spring 7 is connected with the movable valve plate 5.

The valve cover 3 is connected with the fixed valve plate 4 (shell) by a spring and a bolt, and the bolt can provide certain pretightening force for the working surface of the movable valve plate 5. The fixed valve plate 4 (shell) is provided with 4n holes (n is the number of sampling channels on the movable valve plate) for fluid sample introduction and sample discharge, and the holes on the fixed valve plate 4 and the sampling channels on the movable valve plate are on the same horizontal plane; reference numeral 41 denotes a fluid pump inlet, 42 denotes a sample pump through hole, 43 denotes a fluid pump outlet, and 44 denotes a sample discharge hole. And a limiting pin 9 is arranged on the fixed valve plate 4 and used for positioning the movable valve plate 5.

In order to ensure the stability of the movable valve plate 5 in the rotating process and facilitate installation, the movable valve plate 5 and the valve shaft are integrally processed. A plurality of sampling channels are arranged in the radial direction of the movable valve plate 5, different sampling volume channels are distributed and arranged along the axial direction of the movable valve plate 5, and the included angle between the axes of the sampling channels can enable each sampling process to be mutually independent and not interfered. The movable valve plate 5 is a small-angle circular truncated cone in shape, and the working surface is sealed by the axial force applied to the movable valve plate 5 and the spring bolt on the valve cover 3. The limiting groove is formed in one side, connected with the fixed valve plate 4, of the movable valve plate 5, so that the torque loss caused by friction is reduced, the depth of the limiting groove is larger than the protruding length of the limiting pin 9, and the width of the limiting groove is larger than the diameter of the limiting pin. The position of the limiting groove is close to the left edge of the movable valve plate 5, and the longer limiting groove has larger error allowance, so that the processing requirement is reduced. The conical surface of the movable valve plate 5 is a working surface, so that the precision and the roughness of the working surface in the fixed valve plate 4 and the conical surface of the movable valve plate 5 are required to reduce the torque loss caused by friction and ensure the sealing reliability. A bearing is arranged between the left valve shaft of the movable valve plate 5 and the fixed valve plate 4, and a gasket is additionally arranged between the shaft end sealing cover 6 and the fixed valve plate 4 to ensure sealing.

Referring to fig. 2, when the movable valve plate 5 is at the initial position, the torsion spring 7 is in a balanced state, and the sampling passage 51 is located between the fluid pump inlet 41 and the sample pump outlet 42. After the stepping motor 1 is electrified, the torque is transmitted to the torsion spring 7 through the rotating ring transmission piece 2, and when the elastic torque generated by the rotation of the torsion spring 7 and the output torque of the motor overcome the static friction torque of the movable valve plate 5, the movable valve plate 5 and the torsion spring 7 synchronously rotate. After the stepping motor 1 finishes a certain number of steps, the sampling channel 51 on the movable valve plate 5 is aligned with the fluid pumping hole 41 on the fixed valve plate 4, and the sampling channel 51 of the movable valve plate 5 starts to sample. Because the sample injection limit surface 92 on the movable valve plate is in contact with the limit pin 9 on the fixed valve plate 4, the movable valve plate 5 cannot continue to rotate, and the movable valve plate 5 enters a first stagnation stage, the stagnation process aims to fill the sampling channel 51 with fluid, after the stagnation process is completed, the stepping motor 1 is powered off, at the moment, the torsion spring 7 still has certain elastic potential energy, but the friction torque between the working surfaces cannot be overcome due to the elastic torque of the torsion spring 7, and the movable valve plate 5 cannot rotate. In the stock layout stage, the stepping motor 1 is powered on again, the rotation direction of the stepping motor is opposite to the initial rotation direction, after the output torque of the stepping motor 1 and the elastic torque generated by the deformation of the torsion spring 7 overcome the friction torque between the working surfaces, the torsion spring 7 drives the movable valve plate 5 to synchronously rotate, when the limit pin 9 is in contact with the stock layout limit surface 91, the sampling channel 51 on the movable valve plate 5 is aligned with the stock layout through hole 44 and the stock layout through hole 42 on the fixed valve plate 4, and the movable valve plate 5 starts a second stagnation process. After the stepping motor 1 finishes the specified number of steps, the power is cut off, meanwhile, an air pump connected with the sample outlet pump through hole 42 is started, air is pumped into the sampling channel 51 to obtain a sampling fluid, and a sample inlet and sampling period is finished.

The working process of the metering valve assembly is as follows:

referring to fig. 3, the sampling passage 51 is located between the fluid pump inlet 41 and the sample pump outlet 42, the motor shaft drives the rotating ring transmission member 2 to rotate, the rotating ring transmission member 2 transmits torque to deform the torsion spring 7 for energy storage, and the torque transmitted by the torsion spring 7 to the movable valve plate 5 cannot overcome the static friction torque between the working surfaces, which means that the rotating ring transmission member 2 rotates and the movable valve plate 5 is stationary.

Referring to fig. 4-6, when the sum of the output torque of the stepping motor 1 and the elastic torque generated by the torsion spring 7 is greater than the static friction torque between the working surfaces, the torsion spring 7 drives the movable valve plate 5 to rotate until the limit pin 9 contacts the sampling limit surface 92, and at this time, a first stagnation process of the metering valve is started: the sampling channel 51 is aligned with the fluid pump inlet 41, fluid pump outlet 43 and sample injection is initiated, and the stepper motor 1 remains running. When the stepping motor 1 finishes the set steps, the motor is powered off, and simultaneously the torsion spring 7 releases potential energy to generate torque and drive the conversion transmission member 2 to rotate.

Referring to fig. 7, after the sampling channel 51 finishes sampling, the stepping motor 1 is powered on, the rotation direction of the motor shaft is opposite to the initial rotation direction, the torsion transmitted by the rotary transmission member 2 deforms the torsion spring 7 to store energy, the torque transmitted by the torsion spring 7 to the movable valve plate 5 is not enough to overcome the static friction torque between the working surfaces, which is expressed as that the conversion transmission member 2 rotates, and the movable valve plate 5 remains stationary.

Referring to fig. 8-10, when the sum of the output torque of the stepping motor 1 and the elastic torque generated by the torsion spring 7 is greater than the static friction torque between the working surfaces, the torsion spring 7 drives the movable valve plate 5 to rotate until the limit pin 9 contacts the stock form limit surface 91, and then a second stagnation process of the metering valve is started: the sampling passage 51 is aligned with the sample outlet pump through hole 42 and the sample discharge hole 44, and the air pump connected thereto is started to blow out the sample in the sampling passage 51. The stepping motor 1 keeps running, when the stepping motor 1 finishes the preset steps, the motor is powered off, and meanwhile, the torsion spring 7 releases potential energy to generate torque and drive the conversion transmission member 2 to rotate.

According to the utility model, the torsion spring is innovatively used as a transmission element, so that the collision among all parts is relieved, and the service life of the metering valve is prolonged to a certain extent.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro-fluidic high-precision liquid rotary valve assembly, comprising:

the device comprises a fixed valve body, a movable valve body, a valve cover, a driving motor, a rotating ring transmission part, a movable valve plate positioning mechanism for positioning a sample introduction and sampling position, a valve cover and a shaft end sealing cover;

wherein the bolt foot on the fixed valve body shell can be arranged on the working platform; the coaxiality and installation of the fixed valve body and the movable valve body are realized by using a structure to position a tool, and the sealing of the tool is realized by depending on the outline profile between the movable valve body and the fixed valve body and the pretightening force of a bolt between the valve cover and the movable valve body; the driving motor drives the rotating ring to rotate through the motor shaft, and the rotating ring transmission part is connected with the movable valve body through the torsion spring.

2. The micro-fluidic high precision liquid rotary valve assembly of claim 1, wherein:

3. The micro-fluidic high precision liquid rotary valve assembly of claim 1, wherein:

the swivel transmission part is provided with a torsion spring groove for mounting a torsion spring.

4. The micro-fluidic high precision liquid rotary valve assembly of claim 1, wherein:

and a torsion spring groove is formed in the connecting side of the movable valve body and the torsion spring.

5. The micro-fluidic high precision liquid rotary valve assembly of claim 1, wherein:

the movable valve body is a cylinder with a cone angle, and the size of the cone angle is 2-4 degrees.

6. The micro-fluidic high precision liquid rotary valve assembly of claim 1, wherein:

the movable valve body is provided with sampling channels with different measuring ranges, and the right side and the left side of the valve body are provided with limit grooves.

7. The micro-fluidic high precision liquid rotary valve assembly of claim 1, wherein:

the valve cover is provided with a positioning pin, and the positioning pin is matched with a limiting groove on the movable valve body.

8. The micro-fluidic high precision liquid rotary valve assembly of claim 1, wherein: and the fixed valve body is provided with a fluid sample feeding channel and a fluid sample discharging channel.

9. The micro-fluidic high precision liquid rotary valve assembly of claim 1, wherein: the positioning mechanism comprises a limiting groove arranged on the movable valve body and a limiting pin arranged on the valve cover, and a sampling limiting surface and a stock layout limiting surface are arranged on the limiting groove.