阅读说明：本技术 一种用于流动注射分析仪的泵结构 (Pump structure for flow injection analyzer ) 是由 严峻 鲍静姣 朱荣 于 2019-09-17 设计创作，主要内容包括：本发明公开了一种用于流动注射分析仪的泵结构,旨在解决流动注射分析仪用蠕动泵的泵管容易损伤导致漏液现象的不足。该发明包括储液箱、输液管、驱动转轴、传动拉索,传动拉索包括拉绳、若干活塞球,传动拉索贯穿输液管且缠绕在驱动转轴上,输液管上设有出液口,输液管内壁上出液口前侧安装可变形的定位凸圈,活塞球内安装若干推动塞,推动塞端部延伸出活塞球前侧表面且可抵接到定位凸圈上,推动塞和活塞球之间连接回位弹簧,活塞球内和推动塞对应铰接有连杆,连杆一端铰接在推动塞上,另一端铰接推杆,推杆通过联动弹簧连接夹块,夹块夹紧在拉绳上；夹块上设有楔块,活塞球后侧表面安装压杆,压杆向前移动带动夹块向拉绳方向移动。(The invention discloses a pump structure for a flow injection analyzer, and aims to overcome the defect that a pump tube of a peristaltic pump for the flow injection analyzer is easy to damage and causes a liquid leakage phenomenon. The device comprises a liquid storage tank, a liquid conveying pipe, a driving rotating shaft and a transmission inhaul cable, wherein the transmission inhaul cable comprises a pull rope and a plurality of piston balls, the transmission inhaul cable penetrates through the liquid conveying pipe and is wound on the driving rotating shaft, the liquid conveying pipe is provided with a liquid outlet, a deformable positioning convex ring is arranged on the front side of the liquid outlet on the inner wall of the liquid conveying pipe, a plurality of pushing plugs are arranged in the piston balls, the end parts of the pushing plugs extend out of the front side surfaces of the piston balls and can be abutted against the positioning convex rings, return springs are connected between the pushing plugs and the piston balls, connecting rods are correspondingly hinged in the piston balls and the pushing plugs, one ends of the connecting rods are hinged on; the clamping block is provided with a wedge block, the back side surface of the piston ball is provided with a pressure rod, and the pressure rod moves forwards to drive the clamping block to move towards the pull rope.)

1. A pump structure for a flow injection analyzer is characterized by comprising a liquid storage tank, a liquid conveying pipe, a driving rotating shaft and a transmission inhaul cable, wherein the liquid conveying pipe is arranged in a roundabout manner, two ends of the liquid conveying pipe are communicated with the liquid storage tank, the transmission inhaul cable comprises a pull rope and a plurality of piston balls, pull rope through holes are formed in the piston balls, the pull rope penetrates through the pull rope through holes to connect the piston balls in series, the transmission inhaul cable is connected end to end, the transmission inhaul cable penetrates through the liquid conveying pipe and is wound on the driving rotating shaft, the driving rotating shaft is in transmission connection with a driving motor, the piston balls are matched with the liquid conveying pipe, the driving rotating shaft rotates to drive the piston balls to move forwards in the liquid conveying pipe, a liquid outlet is formed in the liquid conveying pipe, a deformable positioning convex ring is arranged on the front side of the liquid outlet in the, a connecting rod is correspondingly hinged in the piston ball and the pushing plug, one end of the connecting rod is hinged on the pushing plug, the other end of the connecting rod is hinged with a push rod, the push rod can be slidably arranged in the piston ball, the push rod is connected with a clamping block through a linkage spring, and the clamping block is clamped on the pull rope; the rear side surface of the piston ball is provided with a positioning groove, the clamping block is provided with a wedge block, the wedge block is provided with a pushing surface which is obliquely arranged, the bottom surface of the positioning groove is provided with a plurality of pressing rods which are arranged in one-to-one correspondence with the wedge block, the front end of each pressing rod is provided with a driving surface which is obliquely arranged, the driving surface is attached to the pushing surface, the rear end of each pressing rod extends backwards to form the bottom surface of the positioning groove, and a reset spring is connected.

2. The pump structure of claim 1, wherein the infusion tube comprises a front tube and a rear tube, the positioning protrusion is disposed at a connection position between the front tube and the rear tube, an outer ring notch is disposed at a connection position between the front tube and the rear tube on an outer wall of the front tube, an inner ring notch is disposed at a connection position between the rear tube and the front tube on an inner wall of the rear tube, the outer ring notch of the front tube is sleeved with the inner ring notch of the rear tube, the inner ring notch of the rear tube is tightly fixed with the positioning ring, a rear positioning ring groove is disposed on an outer wall of a front end of the positioning ring, a front positioning ring groove is disposed on an outer wall of a rear end of the outer ring notch of the front tube, and the front and rear ends of the positioning protrusion are respectively provided with the connecting rings, and the two connecting rings are.

3. The pump structure for a flow injection analyzer of claim 1, wherein the positioning bead has an escape ring groove on its outer wall.

4. The pump structure for a flow injection analyzer of claim 1, wherein the positioning collar inner wall includes a ball ring segment and an angled segment, the ball ring segment being adapted to fit the piston ball.

5. The pump structure for a flow injection analyzer of claim 1, wherein a positioning spring is installed between the push rod and the piston ball.

6. A pump structure for a flow injection analyser according to any one of claims 1 to 5 wherein the outer surface of the piston ball is provided with a cushioning seal.

7. The pump structure for a flow injection analyzer according to any one of claims 1 to 5, wherein a mounting cavity is formed in the piston ball, the push rod, the clamp block, the connecting rod and the push plug are disposed in the mounting cavity, and a sealing block for sealing the mounting cavity is fixedly connected to the surface of the piston ball.

8. The pump structure for flow injection analyzer as claimed in any one of claims 1 to 5, wherein the infusion tube has a liquid inlet at one end, the piston ball enters the infusion tube from the liquid inlet, and the liquid inlet has a bell-mouth shape.

9. The pump structure for a flow injection analyzer according to any one of claims 1 to 5, wherein the push rod has an "I" shape, and the connecting rod is connected to the push rod at a position near the middle thereof.

10. The pump structure for a flow injection analyzer according to any one of claims 1 to 5, wherein a seal ring is installed in the through hole of the pulling rope near both ends.

Technical Field

The present invention relates to a flow injection analyzer, and more particularly, to a pump structure for a flow injection analyzer.

Background

The flow injection analyzer compresses pump pipes with different pipe diameters by a peristaltic pump according to a continuous flow method, injects a reaction reagent and a sample to be detected into a closed and continuous flow current carrier in proportion, generates a color reaction in a chemical reaction unit, measures a signal value in a detector, and measures the concentration of the sample to be detected according to a standard curve method. At present, the flow injection analyzer is widely applied to the analysis of water quality, in particular to the analysis of large-batch water samples. The pump pipe is used as an important component of the flow injection analyzer and plays a crucial role in analysis, once the pump pipe has a problem, the analysis cannot be normally carried out, and data are detected to be abnormal. The peristaltic pump during operation realizes the transport of liquid through the gyro wheel roll extrusion hose, need constantly rub between gyro wheel and the hose, and the hose can take place to warp, and is great to the damage of hose, makes the hose damaged easily, leads to the weeping phenomenon.

Disclosure of Invention

The invention overcomes the defect that the pump pipe of the peristaltic pump for the flow injection analyzer is easy to damage to cause liquid leakage, and provides the pump structure for the flow injection analyzer.

In order to solve the technical problems, the invention adopts the following technical scheme: a pump structure for a flow injection analyzer comprises a liquid storage tank, a liquid conveying pipe, a driving rotating shaft and a transmission cable, wherein the liquid conveying pipe is arranged in a roundabout manner, two ends of the liquid conveying pipe are communicated with the liquid storage tank, the transmission cable comprises a pull rope and a plurality of piston balls, pull rope through holes are formed in the piston balls, the pull rope penetrates through the pull rope through holes to connect the piston balls in series, the transmission cable is connected end to end, the transmission cable penetrates through the liquid conveying pipe and is wound on the driving rotating shaft, the driving rotating shaft is connected with a driving motor in a transmission manner, the piston balls are matched with the liquid conveying pipe, the driving rotating shaft rotates to drive the piston balls to move forwards in the liquid conveying pipe, a liquid outlet is formed in the liquid conveying pipe, a deformable positioning convex ring is arranged on the front side of the liquid outlet on the inner wall of the liquid conveying pipe, a connecting rod is correspondingly hinged in the piston ball and the pushing plug, one end of the connecting rod is hinged on the pushing plug, the other end of the connecting rod is hinged with a push rod, the push rod can be slidably arranged in the piston ball, the push rod is connected with a clamping block through a linkage spring, and the clamping block is clamped on the pull rope; the rear side surface of the piston ball is provided with a positioning groove, the clamping block is provided with a wedge block, the wedge block is provided with a pushing surface which is obliquely arranged, the bottom surface of the positioning groove is provided with a plurality of pressing rods which are arranged in one-to-one correspondence with the wedge block, the front end of each pressing rod is provided with a driving surface which is obliquely arranged, the driving surface is attached to the pushing surface, the rear end of each pressing rod extends backwards to form the bottom surface of the positioning groove, and a reset spring is connected.

The during operation, the drive pivot rotates and drives the piston ball and move forward in the transfer line, and the piston ball of arranging in the liquid reserve tank constantly gets into the transfer line, and the piston ball gets into the transfer line and moves the in-process forward, and transfer line open position forms the negative pressure and inhales the transfer line with the current-carrying liquid in the liquid reserve tank in, and the current-carrying liquid moves in the transfer line along with the piston ball together. After the piston ball reaches the positioning convex ring position, the pushing plug extending outwards abuts against the positioning convex ring, the pushing plug moves inwards to drive the connecting rod to rotate, the connecting rod drives the push rod to move towards the direction away from the pull rope, so that the clamping block is separated from the pull rope, the friction force between the pull rope and the pull rope through hole is small at the moment, along with the continuous rotation of the driving rotating shaft, the pull rope continues to move forwards, the piston ball at the positioning convex ring position keeps still, the pull rope moves in the pull rope through hole in the piston ball to continuously pull the piston ball at the rear part forwards, the liquid outlet is close to the rear side of the positioning convex ring, the distance between the piston ball at the positioning convex ring position and a piston ball behind the piston ball is gradually reduced, the carrier fluid is squeezed out from the liquid outlet, when the surface of the rear piston ball is attached to the positioning groove of the front piston ball, the pressure rod is pushed forwards, and the driving surface, thereby make the clamp splice press from both sides tight stay cord, the stay cord removes the in-process forward, along with tensile continuous increase, will laminate the piston ball on the protruding circle of location and pull away from this position, under return spring effect, promote the stopper and outwards stretch out, drive the push rod through the connecting rod and remove to being close to the stay cord direction, press from both sides tight stay cord from the clamp splice, the piston ball removes along with the stay cord again. At the moment, the latter piston ball is abutted to the positioning convex ring again, and the process is repeated, so that the carrier fluid is continuously discharged from the fluid outlet. And residual carrier fluid between two adjacent piston balls flows back to the liquid storage tank. The pump achieves the effect of a peristaltic pump when in work, but the pump pipe cannot be extruded and deformed, is not easy to damage, avoids the phenomenon of damage and leakage, and has long service life and good infusion effect.

Preferably, the infusion tube comprises a front-section tube and a rear-section tube, the positioning convex ring is arranged at the connecting position of the front-section tube and the rear-section tube, an outer ring notch is arranged on the outer wall of the front-section tube and connected with the connecting position of the rear-section tube, an inner ring notch is arranged on the inner wall of the rear-section tube and connected with the connecting position of the front-section tube, the outer ring notch of the front-section tube and the inner ring notch of the rear-section tube are connected together in a sleeved mode, a positioning ring is tightly mounted at the position of the inner ring notch of the rear-section tube, a rear positioning ring groove is formed in the outer wall of the front end of the positioning ring, a front positioning ring groove is formed in the outer wall of.

The front section pipe and the rear section pipe are connected together to form a transfusion pipe, so that the positioning convex ring is convenient to install and arrange, the positioning convex ring is stable and reliable to install, the sealing performance is good, the positioning convex ring has certain deformation resistance, and the piston ball can deform to pass through.

Preferably, the outer wall of the positioning convex ring is provided with an avoidance ring groove. The arrangement of the avoiding ring groove provides space for the deformation of the positioning convex ring, and is favorable for the piston ball to pass through the positioning convex ring.

Preferably, the inner wall of the positioning convex ring comprises a spherical ring section and an inclined section, and the spherical ring section is matched with the piston ball. The spherical ring section is convenient for pushing the pushing plug inwards, and has good sealing effect with the piston ball. The inclined section is favorable for improving the structural strength of the positioning convex ring.

Preferably, a positioning spring is arranged between the push rod and the piston ball. The positioning spring is arranged to facilitate reliable positioning of the push rod.

Preferably, the outer surface of the piston ball is provided with a buffer sealing layer. The arrangement of the buffering sealing layer is beneficial to improving the sealing performance between the piston ball and the inner wall of the infusion tube.

Preferably, the piston ball is internally provided with an installation cavity, the push rod, the clamping block, the connecting rod and the pushing plug are all arranged in the installation cavity, and the surface of the piston ball is fixedly connected with a sealing block for sealing the installation cavity. The arrangement of the installation cavity is convenient for the installation and arrangement of each part in the piston ball.

Preferably, one end of the infusion tube is provided with a liquid inlet, the piston ball enters the infusion tube from the liquid inlet, and the liquid inlet is of a bell-mouth-shaped structure. The bell mouth-shaped liquid inlet plays a role in guiding the piston ball on one hand, so that the piston ball can conveniently enter the infusion tube, and the carrier fluid can conveniently enter the infusion tube on the other hand.

Preferably, the push rod is of an I-shaped structure, and the connecting rod is connected to the position, close to the middle, of the push rod. The push rod of this structure moves reliably.

Preferably, the through hole of the pull rope is internally provided with a sealing ring close to the two ends. The sealing ring increases the sealing performance between the pull rope and the pull rope through hole.

Compared with the prior art, the invention has the beneficial effects that: the pump pipe of the pump structure for the flow injection analyzer is not easy to damage, avoids the liquid leakage phenomenon, and has long service life and good infusion effect.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is an enlarged partial schematic view of the present invention;

in the figure: 1. a liquid storage box, 2, an infusion tube, 3, a driving rotating shaft, 4, a pull rope, 5, a piston ball, 6, a pull rope through hole, 7, a sealing ring, 8, a liquid inlet, 9, a liquid outlet, 10, a positioning convex ring, 11, a ball ring section, 12, an inclined section, 13, a pushing plug, 14, a mounting hole, 15, a limiting plug, 16, a pushing head, 17, an extension rod, 18, a butt joint surface, 19, a return spring, 20, a connecting rod, 21, a push rod and 22, positioning spring, 23, linkage spring, 24, clamping block, 25, positioning groove, 26, wedge block, 27, pushing surface, 28, compression bar, 29, driving surface, 30, reset spring, 31, mounting cavity, 32, closing block, 33, front section pipe, 34, rear section pipe, 35, outer ring notch, 36, inner ring notch, 37, positioning ring, 38, rear positioning ring groove, 39, front positioning ring groove, 40, connecting ring, 41, guiding surface, 42 and avoiding ring groove.

Detailed Description

The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings: