Novel multihead metering pump

Abstract

The utility model discloses a novel multi -head metering pump belongs to metering pump technical field, including the pump body, the side of pump body is provided with a plurality of transmission cylinder. In the utility model, through setting up a plurality of transmission cylinder and a plurality of suction pump head in the side of pump body, and setting up first check valve and second check valve below and above a plurality of suction pump head respectively, drive motor, worm, worm wheel, transmission rod, square column, the cooperation of rotating tube is used to drive a plurality of cam rotation, through the transmission inclined angle of cam side and the cooperation of the ball of telescopic column end, the elasticity of spring is cooperated simultaneously, make telescopic column, mounting disc and suction diaphragm reciprocating telescopic movement, utilize the deformation of suction diaphragm to make suction pump head constantly suck liquid and discharge liquid, in addition a plurality of cam arrange in a certain angle, make the inner chamber of a plurality of suction pump head suck liquid and discharge liquid regularly, guarantee the stability of the liquid suction and discharge of whole pump body.

Description

Technical Field

[0001] This utility model relates to the field of metering pump technology, and more specifically, to a novel multi-head metering pump. Background Technology

[0002] Metering pumps, also known as quantitative pumps or proportional pumps, are volumetric pumps that achieve precise flow control by adjusting the stroke or frequency. They are mainly used in the petrochemical, pharmaceutical, and water treatment industries for the quantitative addition of corrosive media or chemical additives. In the sampling process of an autosampler in a liquid chromatograph, a metering pump precisely controls the sampling volume. A metering pump mainly consists of three parts: a power drive, a fluid delivery system, and a control system. The power drive unit drives a fluid delivery piston or diaphragm via a mechanical linkage system to achieve reciprocating motion. The piston or diaphragm draws in the fluid to be delivered during the first half of the stroke and discharges the fluid from the pump head during the second half. Changing the reciprocating frequency or the stroke length of each reciprocating motion adjusts the fluid delivery rate. Based on the power drive and fluid delivery methods, metering pumps can be divided into plunger-type and diaphragm-type pumps. In liquid chromatograph sampling, single-head metering pumps have a certain interval between liquid intake and discharge, which is not conducive to ensuring stable liquid delivery. Therefore, we have proposed a new type of multi-head metering pump. Utility Model Content

[0003] In view of the problems existing in the prior art, the purpose of this utility model is to provide a new type of multi-head metering pump.

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] A novel multi-head metering pump includes a pump body, with multiple transmission cylinders arranged on the side of the pump body. Each of the transmission cylinders has a suction pump head at its end. Each suction pump head has a first check valve at its bottom. A supply pipe is fixedly connected to the bottom of each of the first check valves. Each suction pump head has a second check valve at its top. A drain pipe is fixedly connected to the end of each of the second check valves. A suction / drainage mechanism is provided in the inner cavity of each transmission cylinder. A drive mechanism and an adjustment mechanism are provided on the pump body.

[0006] In a preferred embodiment of this utility model, the driving mechanism includes a transmission rod rotatably connected to the inner cavity of the pump body and a reduction gearbox fixedly connected to the end of the pump body. The end of the transmission rod extends into the inner cavity of the reduction gearbox and is fixedly sleeved with a worm gear. A worm is rotatably connected to the reduction gearbox, and the worm and the worm gear mesh with each other. A drive motor is fixedly installed on the top surface of the reduction gearbox. The output shaft of the drive motor is connected to the top end of the worm through a coupling. A square column is fixedly sleeved on the outer side of the transmission rod. A rotating tube is movably sleeved on the outer side of the square column. Multiple cams are fixedly sleeved on the outer side of the rotating tube. The sides of the multiple cams are provided with transmission angles, and two adjacent cams are arranged at a certain angle.

[0007] As a preferred embodiment of this utility model, the suction mechanism includes a spring fixedly connected to the inner cavity of the transmission cylinder. A connecting plate is fixedly connected to the end of the spring. A telescopic column is fixedly sleeved on the connecting plate. One end of the telescopic column extends into the inner cavity of the pump body and is fitted with a ball. The end face of the ball contacts the transmission oblique angle. The other end of the telescopic column is movably sleeved into the inner cavity of the suction pump head and is fixedly connected to an mounting plate. A suction diaphragm is provided on the mounting plate. The side of the suction diaphragm is connected to the inner wall of the suction pump head.

[0008] In a preferred embodiment of this utility model, the adjusting mechanism includes a slide rod fixedly sleeved in the inner cavity of the pump body, a threaded rod rotatably connected in the inner cavity of the pump body, and a brake motor fixedly installed at the end of the pump body. The output shaft of the brake motor is connected to the end of the threaded rod via a coupling. A movable seat is threadedly sleeved on the outer side of the threaded rod. The movable seat and the slide rod are movably sleeved. A connecting frame is fixedly connected to the bottom surface of the movable seat. A bearing is fixedly sleeved at the bottom end of the connecting frame. The inner side of the bearing is fixedly sleeved on the outer side of the rotating tube.

[0009] As a preferred embodiment of this utility model, the top surface of the movable seat is provided with an indicator arrow, the top surface of the pump body is provided with a viewing plate, and the top surface of the viewing plate is provided with a capacity scale.

[0010] In a preferred embodiment of this utility model, a square groove is provided on the inner side of the rotating tube, and the square column is movably sleeved in the inner cavity of the square groove, with the side of the square groove and the outer side of the square column fitting together.

[0011] Compared with existing technologies, the advantages of this utility model are:

[0012] (1) In this utility model, multiple transmission cylinders and multiple suction pump heads are set on the side of the pump body, and a first one-way valve and a second one-way valve are set below and above the multiple suction pump heads respectively. The drive motor, worm, worm wheel, transmission rod, square column and rotating tube are used to drive multiple cams to rotate. The transmission angle on the side of the cam and the ball at the end of the telescopic column are used to cooperate. At the same time, the elastic force of the spring is used to make the telescopic column, mounting plate and suction diaphragm reciprocate to move. The deformation of the suction diaphragm makes the suction pump head continuously suck and discharge liquid. In addition, multiple cams are arranged at a certain angle so that the inner cavity of multiple suction pump heads regularly sucks and discharges liquid, ensuring the stability of the entire pump body's sucking and discharging.

[0013] (2) In this utility model, the screw rod is rotated by the brake motor, and the moving seat, connecting frame and bearing are moved by the threaded engagement between the screw rod and the moving seat. The rotating tube and cam are moved laterally by the bearing, thereby changing the position of the transmission angle of the cam side contacting the ball, and thus changing the range of the reciprocating movement of the telescopic column driving the mounting plate and the suction diaphragm, so as to change the amount of liquid suction and discharge in the inner cavity of the suction pump head, thus realizing the function of adjusting the amount of liquid suction and discharge of the pump body, which has good practicality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic cross-sectional view of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of the casing of this utility model;

[0017] Figure 4 This is a cross-sectional schematic diagram of the gearbox of this utility model;

[0018] Figure 5 This is a cross-sectional schematic diagram of the suction pump head of this utility model;

[0019] Figure 6 This is a schematic diagram of the extraction mechanism of this utility model;

[0020] Figure 7 This is a schematic diagram of the rotating tube of this utility model.

[0021] Explanation of the labels in the diagram:

[0022] 1. Pump body; 2. Transmission cylinder; 3. Suction pump head; 4. Drive mechanism; 5. Adjustment mechanism; 6. Suction and discharge mechanism; 7. First check valve; 8. Supply pipe; 9. Second check valve; 10. Drain pipe; 11. Transmission rod; 12. Square column; 13. Rotating tube; 14. Cam; 15. Transmission angle; 16. Worm gear; 17. Worm; 18. Drive motor; 19. Gearbox; 20. Spring; 21. Connecting plate; 22. Telescopic column; 23. Ball; 24. Mounting plate; 25. Suction diaphragm; 26. Slide rod; 27. Threaded rod; 28. Brake motor; 29. ​​Moving seat; 30. Connecting frame; 31. Bearing; 32. Square groove; 33. Indicating arrow; 34. Perspective plate; 35. Capacity scale. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example:

[0027] Please see Figure 1-7A novel multi-head metering pump includes a pump body 1, multiple transmission cylinders 2 on the side of the pump body 1, a suction pump head 3 at the end of each transmission cylinder 2, a first check valve 7 at the bottom of each suction pump head 3, a supply pipe 8 fixedly connected to the bottom of each first check valve 7, a second check valve 9 at the top of each suction pump head 3, a drain pipe 10 fixedly connected to the end of each second check valve 9, a suction / drainage mechanism 6 in the inner cavity of each transmission cylinder 2, a drive mechanism 4 on the pump body 1, and an adjustment mechanism 5 on the pump body 1.

[0028] In this embodiment, the first one-way valve 7 can only allow the liquid in the supply pipe 8 to enter the inner cavity of the suction pump head 3, and the second one-way valve 9 can only allow the liquid in the inner cavity of the suction pump head 3 to enter the inner cavity of the drain pipe 10.

[0029] For details, please refer to Figures 1 to 7 The drive mechanism 4 includes a transmission rod 11 rotatably connected to the inner cavity of the pump body 1 and a reduction gearbox 19 fixedly connected to the end of the pump body 1. The end of the transmission rod 11 extends into the inner cavity of the reduction gearbox 19 and is fixedly sleeved with a worm gear 16. A worm 17 is rotatably connected to the reduction gearbox 19. The worm 17 and the worm gear 16 mesh with each other. A drive motor 18 is fixedly installed on the top surface of the reduction gearbox 19. The output shaft of the drive motor 18 is connected to the top end of the worm 17 through a coupling. A square column 12 is fixedly sleeved on the outer side of the transmission rod 11. A rotating tube 13 is movably sleeved on the outer side of the square column 12. Multiple cams 14 are fixedly sleeved on the outer side of the rotating tube 13. The sides of the multiple cams 14 are provided with transmission angles 15. Two adjacent cams 14 are arranged at a certain angle.

[0030] In this embodiment, for example, when there are four cams 14, two adjacent cams 14 are arranged at a 90-degree angle.

[0031] For details, please refer to Figure 3 and Figure 6 The suction mechanism 6 includes a spring 20 fixedly connected to the inner cavity of the transmission cylinder 2. A connecting plate 21 is fixedly connected to the end of the spring 20. A telescopic column 22 is fixedly sleeved on the connecting plate 21. One end of the telescopic column 22 extends into the inner cavity of the pump body 1 and is fitted with a ball 23. The end face of the ball 23 contacts the transmission angle 15. The other end of the telescopic column 22 is movably sleeved into the inner cavity of the suction pump head 3 and is fixedly connected to a mounting plate 24. A suction diaphragm 25 is provided on the mounting plate 24. The side of the suction diaphragm 25 is connected to the inner wall of the suction pump head 3.

[0032] In this embodiment, the mounting plate 24 can be composed of two discs of the same size. One disc is fixedly connected to the telescopic column 22, and the other disc is installed on the first disc by bolts, thereby clamping and connecting the suction diaphragm 25. The telescopic column 22, the ball 23 and the cam 14 are all made of high-strength wear-resistant materials to ensure their service life.

[0033] For details, please refer to Figure 2 and Figure 7 The adjusting mechanism 5 includes a slide rod 26 fixedly sleeved in the inner cavity of the pump body 1, a threaded rod 27 rotatably connected in the inner cavity of the pump body 1, and a brake motor 28 fixedly installed at the end of the pump body 1. The output shaft of the brake motor 28 is connected to the end of the threaded rod 27 through a coupling. A movable seat 29 is threadedly sleeved on the outer side of the threaded rod 27. The movable seat 29 and the slide rod 26 are movably sleeved. A connecting frame 30 is fixedly connected to the bottom surface of the movable seat 29. A bearing 31 is fixedly sleeved at the bottom end of the connecting frame 30. The inner side of the bearing 31 is fixedly sleeved on the outer side of the rotating tube 13.

[0034] In this embodiment, the sliding seat 29 is limited by the sleeve between the slide rod 26 and the movable seat 29, so that the movable seat 29 can only move along the axial direction of the threaded rod 27. At the same time, the movable seat 29 is provided with a threaded hole that matches the threaded rod 27, so that the threaded rod 27 and the movable seat 29 can be smoothly transmitted. In addition, the movable seat 29, the connecting frame 30 and the bearing 31 are used to fix and limit the position of the rotating tube 13.

[0035] For details, please refer to Figure 1 and Figure 2 The top surface of the movable seat 29 is provided with an indicator arrow 33, the top surface of the pump body 1 is provided with a viewing plate 34, and the top surface of the viewing plate 34 is provided with a capacity scale 35.

[0036] In this embodiment, the capacity scale 35 is used to indicate the amount of liquid drawn by the metering pump in one stroke. When the moving seat 29 moves to adjust the position of the cam 14, the movement of the cam 14 will adjust the lateral movement distance of the ball 23, the telescopic column 22, the mounting plate 24 and the suction diaphragm 25, thereby changing the amount of liquid drawn in by the suction diaphragm 25. The amount of liquid drawn in is controlled by the cooperation of the indicator arrow 33 and the capacity scale 35. The value of the capacity scale 35 can be obtained from the factory test.

[0037] For details, please refer to Figure 3 and Figure 7 A square groove 32 is provided on the inner side of the rotating tube 13, and the square column 12 is movably sleeved in the inner cavity of the square groove 32. The side of the square groove 32 and the outer side of the square column 12 are in contact with each other.

[0038] In this embodiment, the square column 12 and the square groove 32 are matched to ensure that the square column 12 and the transmission rod 11 can smoothly drive the rotating tube 13 and the cam 14 to rotate synchronously, while the rotating tube 13 and the cam 14 can slide on the square column 12.

[0039] Working principle: During use, the drive motor 18 is started to drive the worm gear 17 to rotate. The transmission between the worm gear 17 and the worm wheel 16 drives the transmission rod 11 to rotate. The transmission rod 11 drives the rotating tube 13 and the cam 14 to rotate. During the rotation of multiple cams 14, the transmission angle 15 on the side of the cam 14 engages with the ball 23 at the end of the telescopic column 22, and simultaneously with the elastic force of the spring 20, causing the telescopic column 22, the mounting plate 24, and the suction diaphragm 25 to move laterally back and forth. When the mounting plate 24 moves closer to the pump body 1, the suction diaphragm 25 increases the space inside the suction pump head 3. The suction force inside the suction pump head 3 draws the liquid from the supply pipe 8 from the first one-way valve 7 into the inner cavity of the suction pump head 3. When the mounting plate 24 moves away from the pump body 1, the suction diaphragm 25 decreases the space inside the suction pump head 3. The diaphragm 25 guides the liquid inside the suction pump head 3 through the second one-way valve 9 into the drain pipe 10. Since multiple cams 14 are arranged at a certain angle, the suction diaphragm 25 operates in a regular manner, and the internal cavities of multiple suction pump heads 3 regularly pump and drain liquid, ensuring the stability of the entire metering pump's pumping and draining. In addition, by starting the brake motor 28, the threaded rod 27 can be rotated. Through the threaded engagement between the threaded rod 27 and the moving seat 29, the moving seat 29, the connecting frame 30, and the bearing 31 are moved. Through the bearing 31, the rotating tube 13 and the cam 14 move laterally, thereby changing the position of the transmission angle 15 on the side of the cam 14 in contact with the ball 23, and thus changing the range of reciprocating movement of the telescopic column 22 driving the mounting plate 24 and the suction diaphragm 25, so as to change the amount of liquid pumped and drained from the internal cavity of the suction pump head 3.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. A novel multi-head metering pump, comprising a pump body (1), characterized in that: The pump body (1) is provided with multiple transmission cylinders (2) on its side. Each of the multiple transmission cylinders (2) is provided with a suction pump head (3) at its end. Each of the suction pump heads (3) is provided with a first check valve (7) at its bottom. Each of the multiple first check valves (7) is fixedly connected to a liquid supply pipe (8) at its bottom end. Each of the suction pump heads (3) is provided with a second check valve (9) at its top end. Each of the multiple second check valves (9) is fixedly connected to a drain pipe (10) at its end. Each of the transmission cylinders (2) is provided with a suction and discharge mechanism (6). The pump body (1) is provided with a drive mechanism (4) and an adjustment mechanism (5).

2. The novel multi-head metering pump according to claim 1, characterized in that: The drive mechanism (4) includes a transmission rod (11) rotatably connected to the inner cavity of the pump body (1) and a reduction gearbox (19) fixedly connected to the end of the pump body (1). The end of the transmission rod (11) extends into the inner cavity of the reduction gearbox (19) and is fixedly sleeved with a worm gear (16). A worm (17) is rotatably connected to the reduction gearbox (19). The worm (17) and the worm gear (16) mesh with each other. A drive motor (18) is fixedly installed on the top surface of the reduction gearbox (19). The output shaft of the drive motor (18) is connected to the top end of the worm (17) through a coupling. A square column (12) is fixedly sleeved on the outer side of the transmission rod (11). A rotating tube (13) is movably sleeved on the outer side of the square column (12). A plurality of cams (14) are fixedly sleeved on the outer side of the rotating tube (13). A transmission angle (15) is provided on the side of each of the plurality of cams (14). Two adjacent cams (14) are arranged at a certain angle.

3. The novel multi-head metering pump according to claim 2, characterized in that: The pumping mechanism (6) includes a spring (20) fixedly connected to the inner cavity of the transmission cylinder (2). A connecting plate (21) is fixedly connected to the end of the spring (20). A telescopic column (22) is fixedly sleeved on the connecting plate (21). One end of the telescopic column (22) extends into the inner cavity of the pump body (1) and is fitted with a ball (23). The end face of the ball (23) is in contact with the transmission angle (15). The other end of the telescopic column (22) is movably sleeved into the inner cavity of the suction pump head (3) and is fixedly connected with an installation plate (24). A suction diaphragm (25) is provided on the installation plate (24). The side of the suction diaphragm (25) is connected to the inner wall of the suction pump head (3).

4. The novel multi-head metering pump according to claim 2, characterized in that: The adjustment mechanism (5) includes a slide rod (26) fixedly sleeved in the inner cavity of the pump body (1), a threaded rod (27) rotatably connected in the inner cavity of the pump body (1), and a brake motor (28) fixedly installed at the end of the pump body (1). The output shaft of the brake motor (28) is connected to the end of the threaded rod (27) through a coupling. A movable seat (29) is threadedly sleeved on the outer side of the threaded rod (27). The movable seat (29) and the slide rod (26) are movably sleeved. A connecting frame (30) is fixedly connected to the bottom surface of the movable seat (29). A bearing (31) is fixedly sleeved at the bottom end of the connecting frame (30). The inner side of the bearing (31) is fixedly sleeved on the outer side of the rotating tube (13).

5. The novel multi-head metering pump according to claim 4, characterized in that: The top surface of the movable seat (29) is provided with an indicator arrow (33), the top surface of the pump body (1) is provided with a viewing plate (34), and the top surface of the viewing plate (34) is provided with a capacity scale (35).

6. The novel multi-head metering pump according to claim 2, characterized in that: The inner side of the rotating tube (13) is provided with a square groove (32), and the square column (12) is movably sleeved in the inner cavity of the square groove (32). The side of the square groove (32) and the outer side of the square column (12) are in contact.

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