Water quality detector sample injection distribution structure

Abstract

Water quality detector sample injection distribution structure, including transfer cylinder, drive device, mounting seat and rotating device, transfer cylinder is straight cylinder with both ends through, its inside is equipped with sliding plug, sliding plug is composed of connecting rod and two sealing plates, two sealing plates are respectively arranged at both ends of connecting rod, drive device is used for driving sliding plug to slide along transfer cylinder axis, mounting seat is located below transfer cylinder, rotating device is arranged on mounting seat and is connected to the outer side wall of transfer cylinder and is used for driving transfer cylinder to do pitching motion, the problem that water sample is difficult to exhaust in peristaltic pump pipeline, is easily affected by liquid characteristics, and injection pump needs to be matched with complex control system to realize water sample transfer, and the transfer speed is slow.

Description

Technical Field

[0001] This utility model relates to the technical field of water quality testing equipment, and more specifically, to the sample dispensing structure of a water quality testing instrument. Background Technology

[0002] Water quality testing is the process of analyzing and measuring pollutants, microorganisms, and other substances in water bodies. It is of great significance for environmental protection, water resource management, and human health. In the water quality testing process, the sample dispensing structure is one of the key components of a water quality analyzer, its function being to accurately deliver the water sample to the testing unit for analysis.

[0003] Traditional water quality analyzers typically use peristaltic pumps or syringe pumps to transport and distribute water samples, both of which have relatively slow transfer speeds. With peristaltic pumps, water sample is always present in the tubing during operation, making complete drainage difficult. Furthermore, peristaltic pumps are susceptible to the properties of the liquid, performing poorly on high-viscosity, particulate, or corrosive liquids, and the tubing may be damaged more quickly due to chemical corrosion or particle abrasion. Syringe pumps, on the other hand, often require guide rails and electrical control systems for sample transfer, resulting in larger size and higher cost. Utility Model Content

[0004] The purpose of this invention is to provide a sample dispensing structure for a water quality analyzer, which solves the problems of water sample being difficult to drain completely from peristaltic pump pipelines and being easily affected by liquid properties, as well as the need for a complex control system and slow transfer speed of syringe pumps to achieve water sample transfer.

[0005] The embodiments of this utility model are achieved through the following technical solutions:

[0006] The water quality analyzer's sample dispensing structure includes:

[0007] The transfer cylinder is a straight cylinder with two ends open, and a sliding stopper is provided inside. The sliding stopper is composed of a connecting rod and two sealing plates. The two sealing plates are respectively located at both ends of the connecting rod.

[0008] A driving device is used to drive the slide plug to slide along the axis of the transfer cylinder;

[0009] The mounting base is located below the transfer cylinder;

[0010] A rotating device, mounted on a mounting base and connected to the outer wall of the transfer cylinder, is used to drive the transfer cylinder to perform pitching motion.

[0011] The driving device includes a lead screw, a lead screw motor, a magnetic ring, and a magnetic plate. The axis of the lead screw is parallel to the axis of the transfer cylinder, and its two ends are respectively connected to the outer wall of the transfer cylinder through mounting plates. The lead screw motor is mounted on the lead screw and drives the lead screw motor to slide along the axis of the lead screw. The magnetic ring is mounted on the outer side of the transfer cylinder and connected to the housing of the lead screw motor, moving along the axis of the lead screw with the lead screw motor. The magnetic plate is located in the middle of the connecting rod and generates magnetic traction between it and the magnetic ring. When the magnetic ring moves along the axis of the lead screw, the traction magnetic ring moves simultaneously, thereby driving the slide block to move.

[0012] The magnetic plate has through holes, which allow the spaces on both sides of the magnetic plate to be connected.

[0013] A sealing ring is provided at the contact point between the sealing plate and the inner wall of the transfer cylinder.

[0014] The magnetic ring has a notch on one side. When the magnetic ring moves along the lead screw, the notch is used to avoid the connection between the rotating device and the transfer cylinder.

[0015] The rotating device includes a turntable and a support rod; the turntable is mounted on a mounting base, and the plane of rotation of the turntable is placed vertically and parallel to the axis of the transfer cylinder; the two ends of the support rod are respectively connected to the side wall of the transfer cylinder and the plane of rotation; when the turntable rotates, it drives the transfer cylinder to make a pitching motion.

[0016] The rotating device includes two telescopic rods and two support rods; one end of each of the two support rods is connected to the side wall of the transfer cylinder, and the other end is respectively hinged to one end of each of the two telescopic rods; the other end of each of the two telescopic rods is hinged to the mounting base.

[0017] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0018] 1. The water quality analyzer of this utility model has a sample dispensing structure. Through the rigid sealing structure of the sliding plug and the sealing ring, combined with the precise drive of the screw motor, it can achieve more stable volume control and avoid the loss caused by long-term compression of components such as hoses, which would lead to a decrease in accuracy.

[0019] 2. The water quality analyzer of this utility model has a sample dispensing structure that uses a drive device to drive a sliding stopper to slide along the axis of the transfer cylinder, thereby achieving the intake and discharge of water samples. Since the sliding stopper consists of a connecting rod and two sealing plates, and a sealing ring is provided at the contact point between the sealing plates and the inner wall of the transfer cylinder, water sample leakage can be effectively prevented, improving the accuracy of sample dispensing.

[0020] 3. The water quality analyzer of this utility model has a sample dispensing structure. The driving device adopts a combination of a lead screw, a lead screw motor, a magnetic ring, and a magnetic plate. It drives the slide block to move through magnetic traction, resulting in a simple structure and low manufacturing cost. Meanwhile, the rotating device adopts a combination of a turntable and a support rod or a telescopic rod and a support rod, enabling the pitching motion of the transfer cylinder. A sample pool and a detection container are respectively set on both sides of the transfer cylinder. Samples are drawn in when the transfer cylinder rotates and tilts towards the reaction container, and then discharged when it rotates and tilts towards the detection container, simplifying the water sample dispensing process.

[0021] 4. The water quality analyzer of this utility model has a sample dispensing structure that transfers water samples by tilting the transfer tube to both sides, which shortens the movement path of the water sample during transfer and reduces water sample residue caused by the long path when the water sample is transferred through multiple components. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 It is attached Figure 1 Sectional view at point aa;

[0024] Figure 3 This is a schematic diagram of the working process of this utility model.

[0025] In the diagram, 1-transfer cylinder, 101-mounting plate, 102-lead screw, 103-lead screw motor, 104-magnetic ring, 201-connecting rod, 202-sealing plate, 203-magnetic plate, 301-support rod, 302-mounting block, 303-telescopic rod, 304-hinged seat, 305-mounting seat, 4-water sample tank, 401-water sample, 5-testing container. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] like Figure 1-3As shown, the water quality analyzer sample dispensing structure includes a transfer cylinder 1, a drive device, a mounting base 305 located below the transfer cylinder 1, and a rotating device. A water sample pool 4 and a detection container 5 are respectively set below both ends of the transfer cylinder 1. The drive device controls the sliding plug inside the transfer cylinder 1 to move linearly along the transfer cylinder 1, so that the water sample 401 is sucked in from the water sample pool 4 at one end and discharged into the detection container 5 from the other end. At the same time, the rotating device on the mounting base 305 drives the transfer cylinder 1 to pitch, so that one end of the transfer cylinder 1 can be tilted and inserted below the liquid surface in the water sample pool 4 for sample suction, and the other end can be tilted close to the detection container 5 to facilitate the flow of the water sample 401 into the detection container 5 for subsequent detection steps.

[0029] The transfer cylinder 1 is a cylindrical straight cylinder structure with both ends open. The material of the transfer cylinder 1 is preferably PVDF or stainless steel. Taking advantage of the corrosion resistance of the material, it is suitable for various water quality conditions and avoids the corrosion of the pipeline by the water sample 401 during long-term use. In order to reduce the liquid flow resistance and ensure the sliding seal with the plug, the inner wall of the transfer cylinder 1 is precision polished.

[0030] The sliding plug consists of a connecting rod 201 and two sealing plates 202. The two sealing plates 202 are respectively connected to the two ends of the connecting rod 201, and the connecting plane of the sealing plates 202 is perpendicular to the axis of the connecting rod 201. The sealing plates 202 have a circular structure, and their outer diameter fits the inner diameter of the transfer cylinder 1. The length of the connecting rod 201 is designed according to the stroke of the transfer cylinder 1, so that at least two sealing plates 202 can be placed inside the transfer cylinder 1 at the same time.

[0031] Specifically, in order to achieve a sliding seal between the sealing plate 202 and the transfer cylinder 1, an annular groove is provided on the edge of the sealing plate 202, and a sealing ring is embedded in the annular groove; when the sealing plate 202 slides in the transfer cylinder 1, the sealing ring deforms and fills the gap between the edge of the sealing plate 202 and the transfer cylinder 1, thereby achieving a reliable sliding seal effect and reducing leakage of water sample 401.

[0032] like Figure 1 As shown, in order to drive the movement of the sliding plug inside the transfer cylinder 1, the drive device needs to adopt a non-contact drive method.

[0033] In one embodiment, the driving device includes a lead screw 102, a lead screw motor 103, a magnetic ring 104, and a magnetic plate 203. The axis of the lead screw 102 is parallel to the axis of the transfer cylinder 1, and its two ends are respectively connected to the outer wall of the transfer cylinder 1 through the mounting plate 101. In order to ensure that the lead screw 102 does not contact the water sample 401, the lead screw 102 is located above the transfer cylinder 1, and the connection position of the mounting plate 101 and the transfer cylinder 1 is a certain distance inward from the end of the transfer cylinder 1. When the end of the transfer cylinder 1 is tilted and immersed in the water sample 401, the water sample 401 will not contact the mounting plate 101. The lead screw motor 103 is mounted on the lead screw 102, and drives the lead screw motor 103 to slide along the axis of the lead screw 102. It should be noted that the lead screw motor 103 is preferably a through-shaft linear stepper motor. The motor is energized and the two ends of the lead screw 102 are fixed to the mounting plate 101, so that... Without rotation, the connection between the lead screw 102 and the threaded nut converts the rotational motion of the rotor into the linear motion of the motor. The magnetic ring 104 is wrapped around the outside of the transfer cylinder 1 and is connected to the housing of the lead screw motor 103 through a bracket. Due to the setting of the magnetic ring 104, the rotation of the lead screw motor 103 is restricted, so that the magnetic ring 104 moves along the axis of the lead screw 102 with the lead screw motor 103. The magnetic plate 203 is located in the middle of the connecting rod 201 and generates magnetic traction between it and the magnetic ring 104 to ensure that the magnetic coupling force is ≥50N. When the magnetic ring 104 moves along the axis of the lead screw 102, the traction magnetic ring 104 moves at the same time, thereby driving the slide block to move. Through holes are distributed around the periphery of the magnetic plate 203, so that the spaces on both sides of the magnetic plate 203 are connected through the through holes. When the transfer cylinder 1 rotates, the water sample 401 inside can be transferred to the other side through the through holes on the magnetic plate 203.

[0034] like Figure 1 As shown, the rotating device needs to be able to drive the transfer cylinder 1 to make pitching motion, and when the magnetic ring 104 moves along the lead screw 102, in order to avoid interference between the connection between the rotating device and the transfer cylinder 1 and the movement of the magnetic ring 104, a notch is provided on one side of the magnetic ring 104. The notch is used to avoid the connection between the rotating device and the transfer cylinder 1.

[0035] The rotating device employs two optional implementation schemes;

[0036] Implementation Scheme 1: The rotating device includes a turntable and a support rod 301; the fixed end of the turntable is mounted on the mounting base 305, so that the rotation plane of the turntable is placed vertically and parallel to the axis of the transfer cylinder 1; one end of the support rod 301 is connected to the middle of the side wall of the transfer cylinder 1, and the other end is connected to the rotation plane; the rotation plane is driven to rotate by the turntable, so that the support rod 301 rotates synchronously with the rotation plane, driving the transfer cylinder 1 to rotate around the axis of the rotation plane; when the turntable rotates, the support rod 301 drives the transfer cylinder 1 to make pitching motion, realizing the angle adjustment when the sample is injected or discharged;

[0037] Implementation Scheme 2: The rotating device includes two sets of telescopic rods 303 and support rods 301, all located beside the transfer cylinder 1. The two sets of telescopic rods 303 and support rods 301 are mirror images of each other with respect to the center of the transfer cylinder 1. One end of the support rod 301 is connected to the side wall of the transfer cylinder 1, and the other end is hinged to the upper end of the telescopic rod 303. The telescopic rod 303 is vertically arranged, and its lower end is hinged to the mounting base 305. The two telescopic rods 303 extend and shorten respectively, causing the two ends of the transfer cylinder 1 to rise or fall respectively. By controlling the different extension and retraction amounts of the two telescopic rods 303, the pitch angle of the transfer cylinder 1 is changed.

[0038] The working principle of this embodiment is as follows:

[0039] The water quality analyzer of this utility model has a sample dispensing structure, such as... Figure 3 As shown, the rotating device adopts implementation scheme two. During sample injection, the telescopic rod 303 near the water sample pool 4 is shortened and the telescopic rod 303 near the detection container 5 is extended by adjusting the angle. This causes one end of the transfer cylinder 1 to tilt downwards towards the water sample pool 4, and one end to be fully inserted into the water sample 401. At the same time, the driving device moves the sliding plug, causing the sealing plate 202 on the side near the water sample pool 4 to extend a certain distance out of the transfer cylinder 1, expelling some of the air between the two sealing plates 202. Then, the sliding plug is retracted to extract the water sample 401 until this... One side of the sealing plate 202 extends into the transfer cylinder 1; at this time, the extracted water sample 401 is located in the chamber between the two sealing plates 202; then, by adjusting the angle, the other end of the transfer cylinder 1 is rotated and tilted downwards towards the detection container 5 to the top of the detection container 5, driving the sliding plug to move towards the detection container 5, and causing the sealing plate 202 on the side closer to the detection container 5 to extend, exposing the chamber between the two sealing plates 202, thereby allowing the water sample 401 located in the chamber between the two sealing plates 202 to flow out into the container for subsequent detection steps.

[0040] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A water quality analyzer sample dispensing structure, characterized in that, include: The transfer cylinder is a straight cylinder with two ends open, and a sliding stopper is provided inside. The sliding stopper is composed of a connecting rod and two sealing plates. The two sealing plates are respectively located at both ends of the connecting rod. A driving device is used to drive the slide plug to slide along the axis of the transfer cylinder; The mounting base is located below the transfer cylinder; A rotating device, mounted on a mounting base and connected to the outer wall of the transfer cylinder, is used to drive the transfer cylinder to perform pitching motion.

2. The water quality analyzer sample dispensing structure according to claim 1, characterized in that, The driving device includes a lead screw, a lead screw motor, a magnetic ring, and a magnetic plate. The axis of the lead screw is parallel to the axis of the transfer cylinder, and its two ends are respectively connected to the outer wall of the transfer cylinder through mounting plates. The lead screw motor is mounted on the lead screw and drives the lead screw motor to slide along the axis of the lead screw. The magnetic ring is mounted on the outer side of the transfer cylinder and connected to the housing of the lead screw motor, moving along the axis of the lead screw with the lead screw motor. The magnetic plate is located in the middle of the connecting rod and generates magnetic traction between it and the magnetic ring. When the magnetic ring moves along the axis of the lead screw, the traction magnetic ring moves simultaneously, thereby driving the slide block to move.

3. The water quality analyzer sample dispensing structure according to claim 2, characterized in that, The magnetic plate has through holes, which allow the spaces on both sides of the magnetic plate to be connected.

4. The water quality analyzer sample dispensing structure according to claim 3, characterized in that, A sealing ring is provided at the contact point between the sealing plate and the inner wall of the transfer cylinder.

5. The water quality analyzer sample dispensing structure according to claim 2, characterized in that, The magnetic ring has a notch on one side. When the magnetic ring moves along the lead screw, the notch is used to avoid the connection between the rotating device and the transfer cylinder.

6. The water quality analyzer sample dispensing structure according to claim 5, characterized in that, The rotating device includes a turntable and a support rod; the turntable is mounted on a mounting base, and the plane of rotation of the turntable is placed vertically and parallel to the axis of the transfer cylinder; the two ends of the support rod are respectively connected to the side wall of the transfer cylinder and the plane of rotation; when the turntable rotates, it drives the transfer cylinder to make a pitching motion.

7. The water quality analyzer sample dispensing structure according to claim 5, characterized in that, The rotating device includes two telescopic rods and two support rods; one end of each of the two support rods is connected to the side wall of the transfer cylinder, and the other end is respectively hinged to one end of each of the two telescopic rods; the other end of each of the two telescopic rods is hinged to the mounting base.

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