Array type multi-split constant flow pump

Abstract

The utility model relates to an array type multi-split constant flow pump which comprises a driving seat, at least one pump head installed on two opposite side faces of the driving seat, a driving shaft installed in the driving seat in a rotating mode, and at least one driving assembly arranged on the driving shaft. A piston mechanism for independently conveying liquid from one end of each pump head to the other end of the pump head is arranged in the driving seat, and the driving assembly drives the piston mechanism corresponding to each pump head to synchronously work when working; connecting plates are arranged on the two sides of a driving base, one or more driving assemblies are arranged on a driving shaft, or one or more pump heads are fixedly installed on each connecting plate in the arrangement direction of the driving assemblies, a liquid supply channel is formed in each pump head, and piston mechanisms corresponding to the pump heads are driven to work synchronously. And a plurality of groups of liquid supply channels can be realized on one constant flow pump. The multiple pump heads can be driven to work at the same time through the single driving source.

Description

Technical Field

[0001] The utility model relates to the technical field of constant current pumps, in particular to an array type one-to-many constant current pumps. Background Art

[0002] Constant flow pumps are currently widely used in biochemistry, medicine, chemical industry, environmental protection and other industries, and they can continuously deliver small flow liquids at constant flow and pressure. However, existing constant flow pumps are equipped with a drive source and a pump head, so a single drive source can only drive one pump head to work independently.

[0003] For example, the patent with announcement number CN218816821 U discloses a durable constant flow pump, including a driving mechanism, a piston mechanism, a water inlet mechanism and a water outlet mechanism, wherein the piston mechanism is driven by the driving mechanism to perform reciprocating piston motion, and when performing reciprocating piston motion, the water flow introduced into the interior of the piston mechanism by the water inlet mechanism is discharged from the water outlet mechanism, characterized in that the driving mechanism includes a motor and a main rotating shaft driven to rotate by the motor, a circular track that can rotate with the main rotating shaft is sleeved on the main rotating shaft, the path of the circular track is an inclined circular plane, and a rotating wheel whose outer circumference rotates along the path of the circular track is provided in the circular track, and the rotating wheel is connected to the piston mechanism in a transmission manner and can drive the piston mechanism to complete the reciprocating piston motion. The above scheme adopts that the driving source drives the driving mechanism to work, thereby driving the water inlet mechanism and the water outlet mechanism to work separately. That is, one pump head works.

[0004] For another example, the patent with announcement number CN220522734U discloses a high-speed non-pulsating constant flow pump. It is composed of a pump body, a motor, a one-way valve and an infusion transmission structure. The motor is fixed to one side of the pump body through a speed change mechanism. The output end of the speed change mechanism is connected to the input end of the infusion transmission structure. The output end of the infusion transmission structure is connected to the one-way valve and the one-way valve respectively; the infusion transmission structure is composed of a crankshaft, a connecting rod, a fixed bearing bush, and a mandrel. The crankshaft is rotatably fixed in the pump body through a fixed bearing bush. One end of the crankshaft is connected to the output end of the speed change mechanism. One end of the connecting rod is set on the crankshaft through a bearing, and the other end is connected to one end of the mandrel through a connecting bearing. The other end of the mandrel is accommodated in a sealed cavity formed by the pump body and the one-way valve. The one-way valve controls the inflow and outflow of liquid from the liquid inlet and the liquid outlet through the valve core inside it. The same method uses a motor to drive an infusion transmission structure to work. Utility Model Content

[0005] In order to solve the above problems, the utility model provides an array type one-to-many constant current pump in which a single driving source can drive multiple pump heads to work simultaneously.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an array-type one-to-many constant-flow pump, including a drive seat, at least one pump head is installed on the two opposite sides of the drive seat, a drive shaft is rotatably installed in the drive seat, at least one drive assembly is arranged on the drive shaft, and a piston mechanism is arranged in the drive seat to transport liquid from one end of each pump head to the other end of the pump head separately, and when the drive assembly is working, the piston mechanism corresponding to each pump head is driven to work synchronously.

[0007] As a preferred embodiment of the utility model, the driving assembly includes an upper cam and a lower cam with the same structure fixedly mounted on the driving shaft, and an upper driving block and a lower driving block with the same structure slidably mounted in the driving seat; a driving hole for accommodating the upper cam is provided in the middle of the upper driving block, and the cooperation between the upper cam and the driving hole enables the upper driving block to move reciprocatingly in a straight line in the driving seat.

[0008] As a preferred embodiment of the present invention, connecting shafts connected to the piston mechanism are fixedly mounted on both sides of the upper driving block and both sides of the lower driving block.

[0009] As a preferred embodiment of the utility model, driven wheels are rotatably mounted on two opposite side walls in the driving hole, and the driven wheels abut against the upper cam.

[0010] As a preferred embodiment of the utility model, the drive assembly also includes a middle cam fixedly mounted on the drive shaft and a middle drive block slidably mounted in the drive seat. The middle drive block has the same structure as the upper drive block, and the middle cam is located between the upper cam and the lower cam; the upper cam, the middle cam and the lower cam are installed on the drive shaft in opposite directions and are set at an angle R.

[0011] As a preferred embodiment of the utility model, the piston mechanism includes a connecting seat fixedly installed in the connecting plate, a piston cavity is arranged in the connecting seat, a piston rod is slidably arranged in the piston cavity, one end of the piston rod extends out of the connecting seat and is fixedly connected to the connecting shaft; a liquid inlet hole and a liquid outlet hole which are through-connected with the piston cavity are arranged at the bottom of the connecting seat, and a one-way valve with the same structure and opposite installation directions is installed in the liquid inlet hole and the liquid outlet hole.

[0012] As a preferred embodiment of the utility model, a liquid outlet groove and a liquid inlet groove are arranged in parallel in the pump head, a liquid inlet pipe that passes through the liquid inlet groove and the liquid inlet hole is on one side of the liquid inlet groove, and a liquid discharge pipe that passes through the liquid outlet groove and the liquid outlet hole is on one side of the liquid outlet groove, and a one-way valve with the same structure and opposite installation directions is installed in the discharge pipe and the liquid inlet pipe; a liquid inlet pipe that is connected to the liquid inlet groove and a liquid outlet pipe that is connected to the liquid outlet groove are arranged on the pump head.

[0013] As a preferred embodiment of the utility model, the liquid inlet pipe and the liquid outlet pipe are located at both ends of the pump head; a liquid inlet adapter connected to the liquid inlet pipe and a liquid outlet adapter connected to the liquid outlet pipe are fixedly installed on the pump head.

[0014] As a preferred embodiment of the utility model, the one-way valve includes a hollow valve body and valve covers arranged at both ends of the valve body, the valve cover is provided with a through hole, and a valve core is slidably arranged in the valve body; the valve core includes a sealing column adapted to the through hole, a blind hole recessed along the axial direction is provided in the valve core, a liquid outlet hole connected to the blind hole control is provided on the side of the valve core, a spring is provided in the blind hole, one end of the spring abuts against the bottom of the blind hole, and the other end abuts against the valve cover.

[0015] As a preferred embodiment of the present invention, a driving source is fixedly mounted on the driving seat; and one end of the driving shaft is fixedly connected to an output end of the driving source.

[0016] The beneficial effects of the utility model are as follows: 1. By arranging connecting plates on both sides of the driving seat, one or more driving components are arranged on the driving shaft, and one or more pump heads are fixedly installed on each connecting plate along the direction in which the driving components are arranged, and each pump head has a liquid supply channel, so that multiple groups of liquid supply channels can be realized on one constant flow pump. Multiple pump heads can be driven to work simultaneously through a single driving source.

[0017] 2. Connecting plates are fixedly installed on both sides of the drive seat, and one or more pump heads are fixedly installed horizontally on each connecting plate. A liquid supply channel is formed in each pump head, and one or more connecting shafts are fixedly installed on both sides of the upper drive block and the lower drive block, and each pump head has a liquid supply channel, which can realize multiple groups of liquid supply channels on a constant flow pump. Multiple pump heads can be driven to work simultaneously through a single driving source. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the utility model.

[0019] Figure 2 It is an exploded stereoscopic schematic diagram of the utility model.

[0020] Figure 3 It is a three-dimensional schematic diagram of the drive assembly of the utility model.

[0021] Figure 4 It is a sectional view of the piston mechanism of the utility model.

[0022] Figure 5 It is a sectional view of the pump head of the utility model.

[0023] Figure 6 It is a cross-sectional view of the one-way valve of the utility model.

[0024] Description of the accompanying figures: 01. Driving seat, 02. Connecting plate, 03. Pump head, 04. Driving shaft, 05. Upper cam, 06. Lower cam, 07. Upper driving block, 08. Lower driving block, 09. Driving hole, 10. Connecting shaft, 11. Driven wheel, 12. Connecting seat, 13. Piston cavity, 14. Liquid inlet hole, 15. Liquid outlet hole, 16. Piston rod, 17. Liquid outlet groove, 18. Liquid inlet groove, 19. Liquid inlet pipe, 2 0. Discharge pipe, 22. One-way valve, 23. Middle cam, 24. Middle drive block, 25. Valve body, 26. Valve cover, 27. Through hole, 28. Valve core, 29. Sealing column, 30. Blind hole, 31. Liquid outlet hole, 32. Spring, 33. Liquid inlet pipe, 34. Liquid outlet pipe, 35. Drive assembly, 36. Liquid inlet adapter, 37. Liquid outlet adapter, 38. Piston mechanism, 39. Liquid inlet channel, 40. Liquid outlet channel. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] Example 1, please refer to Figure 1-6 As shown, the utility model is about an array type one-to-many constant flow pump, including a driving seat 01 and connecting plates 02 fixedly mounted on both sides of the driving seat 01 by means of fasteners, and a pump head 03 is mounted on each connecting plate 02. A driving source is fixedly mounted on the driving seat 01.

[0027] See also Figure 1-3 As shown, a mounting chamber is provided in the drive seat 01, and a drive shaft 04 is rotatably mounted in the mounting chamber by a ball bearing, one end of the drive shaft 04 is fixedly connected to the output end of the driving source by a coupling, and a drive assembly 35 is provided on the drive shaft 04, and the drive assembly 35 includes an upper cam 05 and a lower cam 06 with the same structure fixedly mounted on the drive shaft 04, and an upper drive block 07 and a lower drive block 08 with the same structure and slidably mounted in the mounting chamber. The eccentricity of the upper cam 05 and the lower cam 06 is the same. The two sides of the upper drive block 07 are connected to the side walls of the mounting chamber by linear guide rails, so that the upper drive block 07 slides in the mounting chamber. The lower drive block 08 is slidably mounted in the mounting chamber in the same way, and a drive hole 09 for accommodating the upper cam 05 is provided in the middle of the upper drive block 07, and the two opposite side walls in the drive hole 09 abut against the outer surface of the upper cam 05. The cooperation between the upper cam 05 and the drive hole 09 enables the drive block to move back and forth in a straight line in the mounting chamber along the linear guide rail.

[0028] Connecting shafts 10 connected to the piston mechanism are fixedly mounted on both sides of the upper driving block 07 and both sides of the lower driving block 08, and the connecting shafts 10 and the linear guide rail are arranged parallel to each other. The movement of the upper driving block drives the linear movement of the connecting shaft 10. The connection mode of the lower driving block 08 and the lower cam 06 is the same as the connection mode of the upper cam 05 and the upper driving block 07.

[0029] Driven wheels 11 are rotatably mounted on both sides of the driving hole 09, and the driven wheels 11 abut against the upper cam 05. The driven wheels 11 are preferably ball bearings. The arrangement of the driven wheels 11 enables relative rolling contact between the driving block and the upper cam 05, reducing friction, thereby extending the service life of the driving block and the upper cam 05.

[0030] See also Figure 4 As shown, a plurality of fixing holes connected to the installation chamber are provided on both sides of the driving seat 01, and a piston mechanism 38 corresponding to the pump head 03 is provided in the fixing hole. The piston mechanism 38 is driven by the driving assembly 35 to perform reciprocating piston movement. The piston mechanism 38 includes a connecting seat 12 fixedly installed in the fixing hole in a matching manner, a piston chamber 13 is provided in the connecting seat 12, a liquid inlet hole 14 and a liquid outlet hole 15 connected to the piston chamber 13 are provided at the bottom of the connecting seat 12, and a piston rod 16 is slidably provided in the piston chamber 13, one end of the piston rod 16 extends out of the connecting seat 12 and is fixedly connected to the connecting shaft 10. The piston rod 16 is driven to reciprocate in the piston chamber 13 by the connecting shaft 10. The other end of the piston rod 16 is located in the piston chamber 13 and divides the piston chamber 13 into an upper chamber and a lower chamber, and an exhaust hole connected to the upper chamber is provided at the top of the connecting seat 12, and the liquid inlet hole 14 and the liquid outlet hole 15 at the bottom of the connecting seat 12 are connected to the lower chamber. When the piston rod 16 moves toward the drive seat 01, the air in the upper chamber is discharged from the exhaust hole, and the liquid enters the lower chamber from the liquid inlet hole 14. When the piston rod 16 moves toward the pump head 03, the air enters the upper chamber from the exhaust hole, and the liquid in the lower chamber is discharged from the liquid outlet hole 15.

[0031] The connecting plate 02 is provided with a liquid inlet channel 39 connected to the liquid inlet hole 14 and a liquid outlet channel 40 connected to the liquid outlet hole 15. Both the liquid inlet channel 39 and the liquid outlet channel 40 are installed with one-way valves 22 of the same structure and opposite installation directions.

[0032] See also Figure 5As shown, a liquid outlet groove 17 and a liquid inlet groove 18 are arranged in parallel in the pump head 03, and a liquid inlet pipe 19 is connected to one side of the liquid inlet groove 18, and the liquid inlet pipe 19 and the liquid inlet groove 18 are arranged perpendicularly to each other and are connected to the liquid inlet channel 39. A liquid discharge pipe 20 is connected to one side of the liquid outlet groove 17, and the liquid discharge pipe 20 and the liquid outlet groove 17 are arranged perpendicularly to each other and are connected to the liquid outlet channel 40. A liquid inlet pipe 33 connected to the liquid inlet groove 18 and a liquid outlet pipe 34 connected to the liquid outlet groove 17 are arranged on the pump head 03. The liquid inlet pipe 33 and the liquid outlet pipe are located at both ends of the pump head 03. A liquid inlet adapter 36 connected to the liquid inlet pipe 33 and a liquid outlet adapter 37 connected to the liquid outlet pipe 34 are fixedly installed on the pump head 03.

[0033] The rotation of the drive shaft 04 simultaneously drives the upper cam 05 and the lower cam 06 to rotate synchronously. When the upper cam 05 drives the upper drive block 07 to move toward the pump head 03, the piston rod 16 corresponding to the upper drive block 07 moves toward the pump head 03 in the piston chamber 13. During the movement, the volume of the upper chamber in the piston mechanism 38 corresponding to the upper drive block 07 increases, and air enters the upper chamber from the exhaust hole. At the same time, the volume in the lower chamber is reduced, and the air pressure in the lower chamber increases. The one-way valve 22 in the liquid inlet channel 39 corresponding to the upper drive block 07 is closed under the action of pressure, and the one-way valve 22 in the liquid outlet channel 40 corresponding to the upper drive block 07 is opened under the action of pressure. The liquid in the lower chamber enters the liquid outlet groove 17 through the one-way valve 22 and is discharged through the liquid outlet adapter 37. When the piston mechanism 38 connected to the upper drive block 07 is working, the piston rod 16 corresponding to the upper drive block 07 of the lower drive block 08 moves in the piston chamber 13 in the piston chamber 13 away from the pump head 03. During the movement, the volume of the upper chamber in the piston mechanism corresponding to the lower driving block 08 decreases, and the air in the upper chamber is discharged from the exhaust hole. At the same time, the volume of the lower chamber in the corresponding piston mechanism increases, and the air pressure in the lower chamber decreases. The one-way valve 22 in the liquid inlet channel 39 corresponding to the lower driving block 08 opens under the action of pressure, and the one-way valve 22 in the liquid outlet channel 40 corresponding to the lower driving block 08 closes under the action of pressure, and the liquid enters the lower chamber in the piston mechanism corresponding to the lower driving block 08 and the liquid inlet tank 18. Since the one-way valve 22 in the liquid outlet channel 40 corresponding to the lower driving block 08 is closed under the action of pressure, when the upper driving block 07 moves toward the pump head 03, the liquid can only be discharged from the liquid outlet adapter 37 on the liquid outlet tank 17.

[0034] The driving assembly 35 also includes a middle cam 23 fixedly mounted on the driving shaft 04 and a middle driving block 24 slidably mounted in the mounting chamber. The middle driving block 24 has the same structure as the upper driving block 07. The middle cam 23 is located between the upper cam 05 and the lower cam 06 and is equidistant from the two. The connection mode between the middle driving block 24 and the middle cam 23 is the same as the connection mode between the upper cam 05 and the upper driving block 07. The upper cam, the middle cam and the lower cam are installed on the driving shaft in opposite directions at an angle R. The angle R is 120°, and a corresponding piston mechanism is set in the driving seat 01. Since the eccentricity of the middle cam 23 is smaller than the eccentricity of the upper cam 05. And the working principle is the same. During the process of liquid inlet, the volume of the upper chamber in the piston mechanism corresponding to the middle driving block 24 becomes smaller, and the air in the upper chamber is discharged from the exhaust hole. At the same time, the volume of the lower chamber in the corresponding piston mechanism increases, the air pressure in the lower chamber decreases, the one-way valve 22 in the liquid inlet pipe 19 corresponding to the middle drive block 24 opens under the action of pressure, and the one-way valve 22 in the liquid discharge pipe 20 corresponding to the middle drive block 24 closes under the action of pressure, and the liquid enters the lower chamber in the piston mechanism corresponding to the middle drive block 24. Conversely, while discharging the liquid, the liquid in the lower chamber in the piston mechanism corresponding to the middle drive block 24 is injected and discharged, thereby increasing the volume of the liquid.

[0035] See also Figure 6 As shown, the one-way valve 22 includes a hollow valve body 25 and a valve cover 26 disposed at both ends of the valve body 25, a through hole 27 is disposed on the valve cover 26, a valve core 28 is slidably disposed in the valve body 25, the valve core 28 includes a sealing column 29 adapted to the through hole 27, a blind hole 30 recessed along the axial direction is disposed in the valve core 28, a liquid outlet hole 31 connected to the blind hole 30 is disposed on the side of the valve core 28, a spring 32 is disposed in the blind hole 30, one end of the spring 32 abuts against the bottom of the blind hole 30, and the other end abuts against the valve cover 26. Under normal conditions, the valve core 28 pushes the sealing column 29 to be inserted into the through hole 27 and seals the through hole 27 under the action of the spring 32, so that the liquid cannot flow from one end of the valve body 25 to the other end of the valve body 25. When force is applied to the sealing column 29 , the valve core 28 moves in the valve body 25 to compress the spring 32 , separating the sealing column 29 and the through hole 27 , and the liquid enters the through hole 27 at one end of the valve body 25 into the valve body 25 and then enters the blind hole 30 through the liquid outlet hole 31 and flows to the through hole 27 at the other end of the valve body 25 .

[0036] Embodiment 2. The difference between this embodiment and embodiment 1 is that two or more driving components 35 are arranged on the driving shaft 04. Pump heads 03 corresponding to the driving components 35 are arranged on each connecting plate 02 along the direction in which the driving components 35 are arranged. A piston mechanism corresponding to the pump head 03 is arranged in the driving seat 01, and multiple driving components 35 are driven to work synchronously by a driving source. Thus, multiple pump heads 03 work synchronously, that is, multiple groups of liquid supply channels can be realized on a constant flow pump.

[0037] Embodiment 3. The difference between this embodiment and embodiment 1 is that two or more connecting shafts 10 are arranged on both sides of the upper driving block 07, both sides of the middle driving block 24 and both sides of the lower driving block 08, and corresponding pump heads 03 are arranged on each connecting plate 02 along the direction of arrangement of the connecting shafts 10. A piston mechanism corresponding to the pump head 03 is arranged in the driving seat 01, and multiple driving components 35 are driven to work synchronously by a driving source. Thus, multiple pump heads 03 work synchronously, that is, multiple groups of liquid supply channels can be realized on one constant flow pump.

[0038] Embodiment 4. The difference between this embodiment and the above-mentioned embodiments is that two or more driving components 35 are arranged on the driving shaft 04. On each connecting plate 02, a corresponding pump head 03 is arranged along the direction in which the driving components 35 are arranged. At the same time, two or more connecting shafts 10 are arranged on both sides of the upper driving block 07, on both sides of the middle driving block 24, and on both sides of the lower driving block 08, and on each connecting plate 02, a corresponding pump head 03 is arranged along the direction in which the connecting shafts 10 are arranged. A piston mechanism corresponding to the pump head 03 is arranged in the driving seat 01, and multiple driving components 35 are driven to work synchronously by a driving source. Thus, multiple pump heads 03 work synchronously, that is, multiple groups of liquid supply channels can be realized on a constant flow pump.

[0039] Therefore, a connecting plate 02 is fixedly installed on both sides of the driving seat 01, one or more pump heads 03 are installed on the connecting plate 02, each pump head has a liquid supply channel, one or more driving components 35 are arranged on the driving shaft 04, and a piston mechanism for transporting liquid from one end of each pump head to the other end of the pump head 03 is arranged in the connecting plate 02. When the driving component 35 is working, the piston mechanism corresponding to each pump head 03 is driven to work synchronously, so that multiple groups of liquid supply channels can be realized on a constant flow pump. Multiple pump heads can be driven to work simultaneously through a single driving source.

[0040] It should be noted that, for the sake of clear description, the fasteners described in this application are any one of screws, bolts, and screws, and the driving source described in this application is any one of a servo motor, a synchronous motor, or other motors.

[0041] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0043] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An array type one-to-many constant flow pump, comprising a drive seat, characterized in that: Connecting plates are fixedly installed on the opposite sides of the driving seat, and at least one pump head is installed on each connecting plate. A driving shaft is rotatably installed in the driving seat, and at least one driving assembly is arranged on the driving shaft. A piston mechanism for transporting liquid from one end of each pump head to the other end of the pump head is arranged in the driving seat. When the driving assembly is working, the piston mechanism corresponding to each pump head is driven to work synchronously.

2. The array type one-to-many constant current pump according to claim 1, characterized in that: The driving assembly includes an upper cam and a lower cam with the same structure fixedly mounted on the driving shaft, and an upper driving block and a lower driving block with the same structure slidably mounted in the driving seat; a driving hole for accommodating the upper cam is provided in the middle of the upper driving block, and the cooperation between the upper cam and the driving hole enables the upper driving block to move back and forth in a straight line in the driving seat.

3. The array type one-to-many constant current pump according to claim 2 is characterized in that: Connecting shafts connected to the piston mechanism are fixedly mounted on both sides of the upper driving block and both sides of the lower driving block.

4. The array type one-to-many constant current pump according to claim 3 is characterized in that: A driven wheel is rotatably mounted on two opposite side walls in the driving hole, and the driven wheel abuts against the upper cam.

5. The array type one-to-many constant current pump according to claim 4 is characterized in that: The driving assembly also includes a middle cam fixedly mounted on the driving shaft and a middle driving block slidably mounted in the driving seat. The structure of the middle driving block is the same as that of the upper driving block. The middle cam is located between the upper cam and the lower cam. The eccentricity of the middle cam is smaller than the eccentricity of the upper cam. The upper cam, the middle cam and the lower cam are installed on the driving shaft in opposite directions at an angle R.

6. The array type one-to-many constant flow pump according to claim 3, characterized in that: The piston mechanism includes a connecting seat fixedly installed in the connecting plate, a piston cavity is arranged in the connecting seat, a piston rod is slidably arranged in the piston cavity, one end of the piston rod extends out of the connecting seat and is fixedly connected to the connecting shaft; a liquid inlet hole and a liquid outlet hole which are connected through the piston cavity are arranged at the bottom of the connecting seat, and a one-way valve with the same structure and opposite installation directions is installed in the liquid inlet hole and the liquid outlet hole.

7. The array type one-to-many constant flow pump according to claim 6, characterized in that: The connecting plate is provided with a liquid inlet channel connected to the liquid inlet hole and a liquid outlet channel connected to the liquid outlet hole. Both the liquid inlet channel and the liquid outlet channel are equipped with one-way valves with the same structure and opposite installation directions.

8. The array type one-to-many constant current pump according to claim 7, characterized in that: A liquid outlet groove and a liquid inlet groove are arranged in parallel in the pump head, a liquid inlet pipe passing through the liquid inlet groove and the liquid inlet channel is arranged on one side of the liquid inlet groove, a liquid discharge pipe passing through the liquid outlet groove and the liquid outlet channel is arranged on one side of the liquid outlet groove, and a liquid inlet pipe connected to the liquid inlet groove and a liquid outlet pipe connected to the liquid outlet groove are arranged on the pump head.

9. The array type one-to-many constant current pump according to claim 8, characterized in that: The liquid inlet pipe and the liquid outlet pipe are located at two ends of the pump head; a liquid inlet adapter connected to the liquid inlet pipe and a liquid outlet adapter connected to the liquid outlet pipe are fixedly installed on the pump head.

10. The array type one-to-many constant flow pump according to claim 9, characterized in that: The one-way valve includes a hollow valve body and valve covers arranged at both ends of the valve body, the valve cover is provided with a through hole, and a valve core is slidably arranged in the valve body; the valve core includes a sealing column adapted to the through hole, a blind hole recessed along the axial direction is provided in the valve core, a liquid outlet hole connected to the blind hole control is provided on the side of the valve core, a spring is provided in the blind hole, one end of the spring abuts against the bottom of the blind hole, and the other end abuts against the valve cover.

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