Double-row multi-connection injection pump

Abstract

This invention relates to the field of syringe pump technology, and particularly to a dual-row multi-stage syringe pump, comprising a base and an adapter plate, a control valve, and a cavity mounted on the base from bottom to top. The cavity has two rows of stroke channels, each row including multiple vertically extending stroke channels. A plunger is slidably and sealed within each stroke channel along its respective axial direction. The control valve has two rows of flow channels, each row having multiple flow channels perpendicular to the direction of the stroke channels. Each flow channel corresponds to and communicates with each stroke channel. A mandrel is slidably mounted within each flow channel along its own axial direction and is in close contact with it. The adapter plate has an inlet channel, a first outlet channel, and a second outlet channel. The mandrel controls the liquid in the flow channels to simultaneously enter the two stroke channels along the flow channel axial direction, or controls the liquid in the two stroke channels along the flow channel axial direction to be discharged from the first outlet channel and the second outlet channel respectively, achieving the purpose of one mandrel controlling the simultaneous suction and discharge of liquid from two stroke channels.

Description

Technical Field

[0001] This invention relates to the field of syringe pump technology, and in particular to a dual-row multi-stage syringe pump. Background Technology

[0002] Currently, the syringe pumps used in automated equipment for producing vacuum blood collection tubes, virus sampling tubes, and blood culture bottles are typically solenoid valve type syringe pumps. The reagents used in these automated equipment syringe pumps are usually colloids with a certain viscosity. For example, the syringe pumps used in common automated vacuum blood collection tube production equipment use high-viscosity colloids as reagents.

[0003] The aforementioned syringe pumps are typically single-row syringe pumps, such as... Figure 1 As shown, a typical single-row syringe pump includes a base 1, an adapter plate 2, a control valve 3, a cavity 4, a first drive device 5, and a second drive device 6. The adapter plate 2, control valve 3, and cavity 4 are mounted on the base 1 from bottom to top. The adapter plate 2 has an inlet channel 20 and an outlet pipe 24. The cavity 4 has a row of stroke channels, including multiple stroke channels 40. A plunger 41 is slidably and sealed within each stroke channel 40. The first drive device 5 is driven by the multiple plungers 41, driving each plunger 41 to slide along its respective stroke channel 40. The control valve 3 has multiple flow channels 320, which are connected to the multiple stroke channels 40. In a corresponding manner, the axial direction of the flow channel 320 is perpendicular to the discharge direction of the multiple stroke channels 40, and a spindle 33 is slidably arranged in each flow channel 320 along its respective axial direction; the second driving device 6 is drivenly connected to the multiple spindles 33 and is used to drive each spindle 33 to slide along each flow channel 320; the liquid inlet channel and the liquid outlet pipe 24 are both connected to the multiple flow channels 320, and the spindle 33 is used to control the liquid entering the flow channel 320 from the liquid inlet channel to enter the stroke channel 40 or to control the liquid in the stroke channel 40 to be discharged from the liquid outlet pipe 24. During the liquid suction action, the first driving device 5 drives the plunger 41 to rise, and the second driving device 6 drives the mandrel 33 to slide along the flow channel 320, so that the liquid inlet channel 20 is connected to the stroke channel 40, while blocking the connection between the liquid outlet pipe 24 and the stroke channel 40. This allows the liquid to enter each flow channel 320 from the liquid inlet channel 20 and then enter each stroke channel 40, thereby completing the liquid suction action. During the liquid discharge action, the first driving device 5 drives the plunger 41 to fall, and the second driving device 6 drives the mandrel 33 to slide along the flow channel 320, so that the liquid outlet pipe 24 is connected to the stroke channel 40, while blocking the connection between the liquid inlet channel and the stroke channel 40. This allows the liquid in the stroke channel 40 to be discharged from the liquid outlet pipe 24, thereby completing the liquid discharge action.

[0004] However, the spindle 33 within the aforementioned flow channel 320 typically only controls the suction and discharge of one stroke channel 40 along the axial direction of the flow channel 320. It cannot simultaneously control the suction or discharge of two stroke channels 40 along the axial direction of the flow channel 320 with one spindle 33. When the syringe pump involves dual stroke channels 40, such as... Figure 2 As shown, it is necessary to add the second drive device 6 and control valve 3 mentioned above, widen the injection pump, and thus increase the overall size of the injection pump. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a dual-row multi-stage injection pump, which solves the technical problem that the spindle in the flow channel of the control valve of existing injection pumps can only control the suction and discharge of liquid in one stroke channel of the cavity along the flow channel axis, and cannot achieve simultaneous suction or discharge of liquid in two stroke channels by one spindle along the flow channel axis.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A dual-row multi-stage syringe pump includes a base and an adapter plate, a control valve, and a cavity mounted on the base from bottom to top. The cavity has two rows of stroke channels, each row including multiple stroke channels arranged in a row along a first horizontal direction, with each stroke channel extending vertically along its axial direction. Each stroke channel is equipped with a plunger that slides and seals along its respective axis; the control valve has multiple flow channels, each of which extends horizontally along a first direction perpendicular to the horizontal direction. Each flow channel corresponds to and communicates with two stroke channels arranged at intervals along its axial direction. A mandrel is slidably installed and closely attached to each flow channel along its own axial direction; the adapter plate is provided with an inlet channel, multiple first outlet channels, and multiple second outlet channels; the mandrel is provided with a groove, a first groove, a second groove, a third groove, a first flat portion, and a second flat portion. The first groove, the second groove, and the third groove are offset from each other along the circumference of the mandrel. The first flat portion and the second flat portion are offset from each other along the circumference of the mandrel. The first groove communicates with the groove. The two ends of the first flat portion communicate with the first groove and the third groove, respectively. The second flat portion communicates with the second groove.

[0008] The two rows of stroke channels are respectively designated as front stroke channels and rear stroke channels. Each stroke channel of the front stroke channel is connected to the liquid inlet channel through the grooves and first slots on each mandrel. Each stroke channel of the rear stroke channel is connected to the liquid inlet channel through the grooves, first flat portions and third slots on each mandrel. Each stroke channel of the front stroke channel is connected to each first liquid outlet channel through the grooves on each mandrel. Each stroke channel of the rear stroke channel is connected to each second liquid outlet channel through the second slots and second flat portions on each mandrel.

[0009] Furthermore, a heating rod is provided on the adapter plate, and the heating rod is parallel to the liquid inlet channel.

[0010] Furthermore, the adapter plate is provided with at least two heating channels, each of which is parallel to the liquid inlet channel and is located between the two heating channels. Each heating channel is equipped with a heating rod.

[0011] Furthermore, both the valve core sleeve and the mandrel are made of ceramic material.

[0012] Furthermore, the groove is arranged circumferentially along the mandrel, and the groove is an O-shaped groove.

[0013] Furthermore, a first sealing ring is provided at the connection position between the travel channel and the flow channel. The first sealing ring is used to prevent liquid from leaking from the gap between the cavity and the control valve.

[0014] Furthermore, a second sealing ring is provided at the connection position between the flow channel and the liquid inlet channel. The second sealing ring is used to prevent liquid from leaking from the gap between the adapter plate and the control valve.

[0015] Furthermore, a variable-gap plate is provided between the adapter plate and the base. The variable-gap plate has multiple first connecting channels and multiple second connecting channels inside. One end of each of the multiple first connecting channels is connected to a corresponding multiple first liquid outlet channel, and one end of each of the multiple second connecting channels is connected to a corresponding multiple second liquid outlet channel. The bottom of the variable-gap plate also has multiple first straight outlet channels and second straight outlet channels. The other ends of each of the multiple first straight outlet channels are connected to a corresponding multiple first connecting channels, and the other ends of each of the multiple second straight outlet channels are connected to a corresponding multiple second connecting channels. The distance between the first straight outlet channels and the second straight outlet channels is greater than the distance between the first liquid outlet channels and the second liquid outlet channels.

[0016] Furthermore, the bottom of the base is provided with a plurality of first liquid outlets and a plurality of second liquid outlets along the vertical direction. The plurality of first liquid outlets are connected to a plurality of first straight outlet channels in a one-to-one correspondence, and the plurality of second liquid outlets are connected to a plurality of second straight outlet channels in a one-to-one correspondence. Each first liquid outlet and each second liquid outlet is provided with an internal thread.

[0017] Furthermore, the top port of the travel channel is provided with a sealing structure, which includes a bushing and a seal. The top port of the travel channel has a coaxial mounting groove. The bushing is installed and fixed in the mounting groove and is coaxial with the travel channel. The inner diameter of the bushing is the same as the inner diameter of the travel channel. The seal is provided between the outer wall of the bushing and the inner wall of the mounting groove to seal the gap between the outer wall of the bushing and the mounting groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In use, the dual-row multi-stage syringe pump of the present invention has one row of stroke channels near the inlet channel as the front stroke channel and the other row as the rear stroke channel. During liquid aspiration, each stroke channel in the front stroke channel is connected to the inlet channel through grooves and first slots on each mandrel, and each stroke channel in the rear stroke channel is connected to the inlet channel through grooves, first flat portions and third slots on each mandrel. At the same time, the outer wall of the mandrel blocks the positions where each flow channel connects to each first outlet channel and each second outlet channel. Then, each plunger is driven to rise, creating a negative pressure in each stroke channel. At this time, viscous liquid enters each stroke channel of the front stroke channel from the inlet channel through the grooves and first slots on each mandrel, and viscous liquid enters each stroke channel of the rear stroke channel from the inlet channel through the grooves, first flat portions and third slots on each mandrel, thereby completing the liquid aspiration action.

[0020] When drainage is required, each mandrel is synchronously driven to slide axially along each flow channel, so that the position where the inlet channel connects with each flow channel is blocked by the outer wall of each mandrel, each first outlet channel and each stroke channel on the front stroke channel are connected through the groove on each mandrel, the second slot on each mandrel is connected to each stroke channel of the rear stroke channel, and each second outlet channel and the second slot on each mandrel are connected through the second flat part on each mandrel. Then, each plunger is driven to descend synchronously, so that the liquid in each stroke channel of the front stroke channel enters directly from the groove on each mandrel into each first outlet channel and is discharged, and the liquid in each stroke channel of the rear stroke channel enters each first outlet channel through the second slot and the second flat part on the mandrel in sequence and is discharged, thereby completing the drainage action.

[0021] Therefore, the double-row multi-stage syringe pump of the present invention can overcome the technical defect that the spindle in the flow channel can only control the suction and discharge of liquid in one stroke channel of the cavity along the axial direction of the flow channel, and cannot realize the simultaneous suction or discharge of liquid in two stroke channels by one spindle along the axial direction of the flow channel, effectively avoiding the increase in the size of the syringe pump due to the addition of an extra control valve. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a single-row injection pump involved in the background art of this invention;

[0023] Figure 2 This is a schematic diagram of the structure of the dual-row injection pump involved in the background art of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of a dual-row syringe pump in the liquid aspiration state according to an embodiment of the present invention;

[0025] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0026] Figure 5 for Figure 3 Enlarged structural diagram at point B;

[0027] Figure 6 for Figure 3 Enlarged structural diagram at point C;

[0028] Figure 7 This is a schematic diagram of the structure of a dual-row syringe pump in the dispensing state according to an embodiment of the present invention;

[0029] Figure 8 for Figure 7 Enlarged structural diagram at point D;

[0030] Figure 9 This is a schematic diagram of the mandrel structure according to an embodiment of the present invention;

[0031] Figure 10 for Figure 9 Another structural diagram from a different angle;

[0032] Figure 11 This is a schematic diagram of the valve core sleeve involved in this embodiment;

[0033] Figure 12 This is a three-dimensional structural diagram of a dual-row injection pump according to an embodiment of the present invention;

[0034] Figure 13 for Figure 12 Another structural diagram from a different angle;

[0035] Figure 14 for Figure 12 The left view;

[0036] Figure 15 This is a top view of the cavity involved in an embodiment of the present invention;

[0037] Figure 16 This is a top view of the base according to an embodiment of the present invention;

[0038] Figure 17 This is a schematic diagram of the structure of the second driving device and the spindle driving connection in an embodiment of the present invention.

[0039] Numbers in the attached drawings:

[0040] 1. Base; 10. First liquid outlet; 11. Second liquid outlet; 2. Adapter plate; 20. Liquid inlet channel; 21. First liquid outlet channel; 22. Second liquid outlet channel; 23. Heating channel; 230. Heating rod; 24. Liquid outlet pipeline; 3. Control valve; 31. Valve body; 32. Valve core sleeve; 320. Flow channel; 33. Mandrel; 330. Groove; 331. First slot; 332. Second slot; 333. Third slot; 334. First flat part; 335. Second flat part; 4. Cavity; 40. Stroke channel; 41. Plunger; 42. Bushing; 43. First seal; 45. Front stroke channel ; 46. Rear travel passage; 5. First drive device; 50. Fixed seat; 51. Lifting mechanism; 510. Power motor; 52. Sliding block; 53. Connecting seat; 54. Guide rod; 55. Connecting sleeve; 550. Second O-ring seal; 56. First limit switch; 57. Second limit switch; 6. Second drive device; 60. Drive cylinder; 61. Card seat; 62. Guide assembly; 63. Mounting plate; 7. First sealing ring; 8. Second sealing ring; 9. Pitch plate; 90. First connecting passage; 91. Second connecting passage; 92. First straight outlet passage; 93. Second straight outlet passage; 94. Sealing head. Detailed Implementation

[0041] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0042] In the description of this invention, it should be understood that the terms "width," "upper," "lower," "front," "rear," "top," and "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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 the invention. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] In this invention, unless otherwise expressly specified and limited, the first feature "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0044] Please refer to Figures 3-17The present invention provides a dual-row multi-stage injection pump, including a base 1, an adapter plate 2, a control valve 3, a cavity 4, a first drive device 5, and a second drive device 6.

[0045] Reference Figure 14 The adapter plate 2, control valve 3, and cavity 4 are arranged on the base 1 from bottom to top. Specifically, the adapter plate 2 is fixed on the base 1, the control valve 3 is fixed on the adapter plate 2, and the cavity 4 is fixed on the control valve 3.

[0046] Reference Figure 3 , Figure 4 , Figure 12 and Figure 15 The cavity 4 has two rows of travel channels 40. Each row of travel channels 40 includes multiple travel channels 40 arranged in a row along the first horizontal direction. The two rows of travel channels 40 are spaced apart along the second horizontal direction, which is perpendicular to the first horizontal direction. The axial direction of each travel channel 40 extends vertically. Each travel channel 40 is provided with a plunger 41 that slides and seals along its own axial direction. One end of each plunger 41 extends out of each travel channel 40 along its own axial direction.

[0047] Reference Figure 3 and Figure 6 The top port of the stroke channel 40 is provided with a sealing structure, which includes a bushing 42 and a first seal 43. The first seal 43 is a first O-ring. The top port of the stroke channel 40 has a coaxial mounting groove. The bushing 42 is installed and fixed in the mounting groove, and the bushing 42 is coaxial with the stroke channel 40. The inner diameter of the bushing 42 is the same as the inner diameter of the stroke channel 40. The first seal 43 is provided between the outer wall of the bushing 42 and the inner wall of the mounting groove to seal the gap between the outer wall of the bushing 42 and the mounting groove. This prevents liquid in the stroke channel 40 from leaking from the gap between the outer wall of the bushing 42 and the mounting groove, and also prevents relative sliding friction between the plunger 41 and the first seal 43 during sliding, thereby improving the sealing performance between the plunger 41 and the stroke channel 40.

[0048] Reference Figure 3 , Figure 6 and Figure 12One end of the plunger 41 slides axially through the bushing 42, allowing the plunger 41 to be driven and connected to the first driving device 5. The first driving device 5 is located outside the cavity 4 and includes a fixed seat 50, a lifting mechanism 51, a sliding block 52, and a connecting seat 53. The fixed seat 50 is fixed to the outer wall of the cavity 4, and the lifting mechanism 51 is mounted on the fixed seat 50 and driven and connected to the sliding block 52 to drive the sliding block 52 to move vertically. The connecting seat 53 is connected and fixed to the sliding block 52, and two rows of connecting sleeves 55 are fixed on the connecting seat 53. Each row of connecting sleeves 55 includes multiple connecting sleeves 55 arranged in a row along the first horizontal direction. Each connecting sleeve 55 corresponds one-to-one with each plunger 41, and each connecting sleeve 55 is sealed and fitted onto one end of each plunger 41 extending out of each bushing 42. Specifically, a second O-ring 550 is fixed between the inner wall of each connecting sleeve 55 and the outer wall of one end of each sleeve 42 extending from each plunger 41, thereby achieving a seal between the connecting sleeve 55 and the plunger 41 and preventing liquid in the stroke channel 40 from leaking from the gap between the connecting sleeve 55 and the plunger 41. Therefore, the lifting mechanism 51 can achieve synchronous lifting of multiple plungers 41.

[0049] In this embodiment, the lifting mechanism 51 adopts a screw lifting mechanism; of course, in other embodiments, the lifting mechanism 51 may also be an electric push rod or a linear module of a slide table, which is not limited here.

[0050] In addition, refer to Figure 13 Two guide rods 54 are also provided on the fixed base 50. The guide rods 54 extend vertically and slide through the sliding block 52. The two guide rods 54 are symmetrical about the vertical central axis of the sliding block 52. The guide rods 54 are mainly used to guide the lifting and lowering of the sliding block 52, improving the stability of the sliding block 52 driving the connecting seat 53 to drive the plunger 41 to lift and lower. Of course, a first limit switch 56 and a second limit switch 57 are fixed at the upper and lower ends of the fixed base 50, respectively. The first limit switch 56 and the second limit switch 57 are both electrically connected to the control system (not shown) of the power motor 510 that controls the lifting mechanism 51. The first limit switch 56 is used to detect the downward stroke of the sliding block 52, and the second limit switch 57 is used to detect the upward stroke of the sliding block 52, thereby controlling the lifting and lowering stroke of the plunger 41.

[0051] Reference Figure 3 , Figure 4 , Figure 11 , Figure 12 and Figure 17The control valve 3 has multiple flow channels 320, each of which extends axially along a second horizontal direction. Each flow channel 320 corresponds to and communicates with two stroke channels 40 arranged at intervals along its axial direction. The control valve 3 includes a valve body 31 and multiple valve core sleeves 32. The opposite sides of the valve body 31 are fixed to the cavity 4 and the adapter plate 2, respectively. The multiple valve core sleeves 32 correspond to the multiple flow channels 320, and their axial directions extend along a second horizontal direction. The inner cavity of the valve core sleeve 32 forms the flow channels 320 of the control valve 3. A first sealing ring 7 is fixed at the communication position between the stroke channel 40 and the flow channel 320 to prevent liquid leakage from the gap between the cavity 4 and the control valve 3.

[0052] In addition, each flow channel 320 has a mandrel 33 that slides along its respective axis and is in close contact with it. Both the valve core sleeve 32 and the mandrel 33 are made of ceramic material, which can improve the fit between the flow channel 320 and the mandrel 33, thereby improving the sealing performance between the flow channel 320 and the mandrel 33.

[0053] Reference Figure 3 , Figure 4 and Figures 7-10 The mandrel 33 has a groove 330, a first groove 331, a second groove 332, a third groove 333, a first flat portion 334, and a second flat portion 335. The groove 330 is arranged along the circumference of the mandrel 33 and is an O-shaped groove. The first groove 331, the second groove 332, and the third groove 333 are staggered relative to each other along the circumference of the mandrel 33. The first flat portion 334 and the second flat portion 335 are staggered along the circumference of the mandrel 33. The first groove 331 communicates with the groove 330. The two ends of the first flat portion 334 communicate with the first groove 331 and the third groove 333, respectively. The second flat portion 335 communicates with the second groove 332.

[0054] Reference Figure 3 , Figure 4 , Figures 7-10 and Figure 17 The second driving device 6 is mounted on the base 1 and drivenly connected to each spindle 33, used to drive each spindle 33 to slide synchronously along each flow channel 320. Specifically, the second driving device 6 includes a driving cylinder 60, a retaining seat 61, and a guide assembly 62. The driving cylinder 60 is fixed to the base 1 by a mounting plate 63, and the telescopic end of the driving cylinder 60 is drivenly connected to the retaining seat 61. One end of each spindle 33 extends axially out of each flow channel 320 and is engaged and fixed to the retaining seat 61. Thus, under the driving force of the driving cylinder 60, each spindle 33 slides axially along each flow channel 320. Of course, the guide assembly 62 is slidably mounted on the mounting plate and connected and fixed to the retaining seat 61, used to guide the sliding of the retaining seat 61. The structure of the guide assembly 62 here is the same as the guide structure used to guide the connecting seat 53 described above, and will not be repeated here.

[0055] Reference Figure 3 , Figure 4 and Figure 12 The adapter plate 2 has an inlet channel 20, multiple first outlet channels 21, and multiple second outlet channels 22. The inlet channel 20 extends along a horizontal first direction. The multiple first outlet channels 21 correspond one-to-one with and are connected to multiple travel channels 40 in one row of travel channels 40. The multiple second outlet channels 22 correspond one-to-one with and are connected to multiple travel channels 40 in another row of travel channels 40. Among the two rows of travel channels 40, the row of travel channels 40 closest to the inlet channel 20 is designated as the front row of travel channels 45, and the other row of travel channels 40 is designated as the rear row of travel channels 46.

[0056] Reference Figure 3 , Figure 4 , Figures 7-10 and Figure 15The stroke channel 40 of the front stroke channel 45 is connected to the liquid inlet channel 20 through the groove 330 and the first slot 331 on the spindle 33. The stroke channel 40 of the rear stroke channel 46 is connected to the liquid inlet channel 20 through the groove 330, the first flat portion 334 and the third slot 333 on the spindle 33. The stroke channel 40 of the front stroke channel 45 is connected to the first liquid outlet channel 21 through the groove 330 on the spindle 33. The stroke channel 40 of the rear stroke channel 46 is connected to the second liquid outlet channel 22 through the second slot 332 and the second flat portion 335 on the spindle 33. Specifically, it can be understood that when the syringe pump is in the liquid aspiration state, both the first liquid outlet channel 21 and the second liquid outlet channel 22 are blocked by the outer wall of the spindle 33, the plunger 41 is in the rising state, the groove 330 of the spindle 33 is connected to the liquid inlet channel 20, and the first slot 331 of the spindle 33 is connected to the stroke channel 40 of the front stroke channel 45. In this way, the liquid in the liquid inlet channel 20 can enter the first slot 331 of the spindle 33 through the groove 330 of the spindle 33 and then enter the stroke channel 40 of the front stroke channel 45. At the same time, the third slot 333 of the spindle 33 is connected to the stroke channel 40 of the rear stroke channel 46. Since the third slot 333 of the spindle 33 is connected to the first flat part 334, the liquid in the liquid inlet channel 20 can enter the stroke channel 40 of the rear stroke channel 46 through the groove 330 of the spindle 33 along the first flat part 334 of the spindle 33. In the draining state, the plunger 41 is in a descending state, and the inlet channel 20 is blocked by the outer wall of the spindle 33. The groove 330 on the spindle 33 is directly opposite to the first outlet channel 21 and the stroke channel 40 of the front stroke channel 45, so that the groove 330 on the spindle 33 connects the first outlet channel 21 and the stroke channel 40 of the front stroke channel 45. At the same time, the second slot 332 on the spindle 33 is directly opposite to the lower port of the stroke channel 40 of the rear stroke channel 46. The end of the second flat part 335 on the spindle 33 facing away from the second slot 332 on the spindle 33 is connected to the second outlet channel 22. Since the second flat part 335 on the spindle 33 is connected to the second slot 332 on the spindle 33, the liquid in the stroke channel 40 of the rear stroke channel 46 can enter the second outlet channel 22 and be discharged through the second slot 332 on the spindle 33 and along the second flat part 335 of the spindle 33.

[0057] It should be noted that the liquid in this embodiment refers to a liquid with a certain viscosity.

[0058] Reference Figure 4 and Figure 14The adapter plate 2 is equipped with a heating rod 230, which is parallel to the liquid inlet channel 20. The heating rod is mainly used to heat the liquid and accelerate the flow of the viscous liquid in the liquid inlet channel 20, thus preventing high-viscosity liquids from being unsuitable for the injection pump of this invention. Specifically, the adapter plate 2 has at least two heating channels 23, each parallel to the liquid inlet channel 20, with the liquid inlet channel 20 located between the two heating channels 23. A heating rod 230 is installed and fixed in each heating channel 23, which can further accelerate the heating of the adapter plate 2.

[0059] Reference Figure 3 A second sealing ring 8 is provided at the connection position between the flow channel 320 and the liquid inlet channel 20. The second sealing ring 8 is used to prevent liquid from leaking from the gap between the adapter plate 2 and the valve body 31 of the control valve 3.

[0060] Reference Figure 3 , Figure 4 and Figure 14 A variable-gap plate 9 is provided between the adapter plate 2 and the base 1. The variable-gap plate 9 has multiple first connecting channels 90 and multiple second connecting channels 91 inside. One end of each of the first connecting channels 90 communicates with one of the first liquid outlet channels 21, and one end of each of the second connecting channels 91 communicates with one of the second liquid outlet channels 22. The port of the first connecting channel 90 that penetrates the variable-gap plate 9 along the second horizontal direction is sealed by a sealing head 94. Similarly, the port of the second connecting channel 91 that penetrates the variable-gap plate 9 along the second horizontal direction is sealed by a sealing head 94.

[0061] In addition, refer to Figure 3 The bottom of the variable pitch plate 9 also has multiple first direct outlet channels 92 and multiple second direct outlet channels 93. The multiple first direct outlet channels 92 are connected to the other ends of multiple first connecting channels 90 one by one, and the multiple second direct outlet channels 93 are connected to the other ends of multiple second connecting channels 91 one by one. The distance between the first direct outlet channels and the second direct outlet channels is greater than the distance between the first liquid outlet channel 21 and the second liquid outlet channel 22. In this way, the distance between the front and rear liquid outlets in the stroke cavity 4 can be changed to the required terminal liquid outlet distance.

[0062] Reference Figure 3 and Figure 16The base 1 has multiple first liquid outlets 10 and multiple second liquid outlets 11 vertically arranged at its bottom. Each first liquid outlet 10 corresponds to a first straight outlet channel, and each second liquid outlet 11 corresponds to a second straight outlet channel. The first and second liquid outlets 10 and 11 have internal threads, primarily for facilitating needle installation. For example, when the injection pump of this embodiment is applied to an automated vacuum blood collection tube production equipment, the variable pitch plate 9 can achieve variable pitch between the front and rear liquid outlets, thus satisfying the versatility of the vacuum blood collection tube filling mold. The needles, connected to the internal threads of the first and second liquid outlets 10 and 11, deliver liquid into the vacuum blood collection tube on the filling mold.

[0063] It should be noted that the variable pitch plate 9 can be selected as needed depending on the application scenario of the injection pump. When the variable pitch plate 9 is not required, each of the first direct outlet channels on the base 1 is directly connected to each of the first liquid outlet channels 21, and each of the second direct outlet channels is directly connected to each of the second liquid outlet channels 22.

[0064] The working principle of this invention is as follows:

[0065] In use, the dual-row multi-unit syringe pump of the present invention, during liquid aspiration, connects each stroke channel 40 on the front stroke channel 45 to the liquid inlet channel 20 via grooves 330 and first slots 331 on each spindle 33. Similarly, connects each stroke channel 40 on the rear stroke channel 46 to the liquid inlet channel 20 via grooves 333, first flat portions 334, and third slots 333 on each spindle 33. Simultaneously, the positions where each first liquid outlet channel 21 and each second liquid outlet channel 22 connects to each flow channel 320 are all... The outer wall of the mandrel 33 is sealed; then, the lifting mechanism 51 drives each plunger 41 to rise, creating negative pressure in each stroke channel 40. At this time, viscous liquid enters each stroke channel 40 of the front stroke channel 45 from the inlet channel 20 through the groove 330 and the first slot 331 on each mandrel 33, and viscous liquid enters each stroke channel 40 of the rear stroke channel 46 from the inlet channel 20 through the groove 330, the first flat portion 334 and the third slot 333 on each mandrel 33, thus completing the process. Liquid suction action; when liquid discharge is required, the second drive device 6 drives each mandrel 33 to slide axially along each flow channel 320, so that the outer wall of the mandrel 33 blocks the position where the liquid inlet channel 20 communicates with the flow channel 320, so that each first liquid outlet channel 21 and each stroke channel 40 on the front stroke channel 45 are connected through the groove 330 on each mandrel 33, the second groove 332 on each mandrel 33 is connected to each stroke channel 40 of the rear stroke channel 46, and each second liquid outlet channel 22 and the first groove 332 on each mandrel 33 are connected. The two slots 332 are connected through the second flat portion 335 on each spindle 33. Then, the lifting mechanism 51 drives each plunger 41 to descend synchronously, so that the liquid in each stroke channel 40 on the front stroke channel 45 directly enters each first liquid outlet channel 21 from the groove 330 on each spindle 33 and is discharged. The liquid in each stroke channel 40 on the rear stroke channel 46 sequentially enters each first liquid outlet channel 21 through the second slot 332 and the second flat portion 335 on the spindle 33 and is discharged, thereby completing the liquid discharge action. It can be seen that the double-row multi-unit injection pump of the present invention can overcome the technical defect that the spindle 33 in the flow channel 320 can only control the suction and discharge of one stroke channel 40 of the cavity 4 along the axial direction of the flow channel 320, and cannot realize the simultaneous suction or discharge of two stroke channels 40 by one spindle 33 along the axial direction of the flow channel 320. It effectively avoids the need to widen the injection pump by adding an additional control valve 3 or a second drive device 6, and thus effectively avoids the increase in the overall size of the injection pump.

[0066] In summary, the syringe pump of the present invention has the following beneficial effects:

[0067] 1. The syringe pump of the present invention is applicable to a variety of miniaturized, high-precision, multi-channel liquid handling scenarios (such as medical testing, environmental monitoring, and biological experimental equipment).

[0068] 2. The syringe pump of the present invention has been improved from the original single-discharge liquid pump to a double-discharge liquid pump. The double-discharge liquid pumping is controlled by a single spindle 33, which not only greatly improves the working efficiency but also reduces the cost. Furthermore, it enables the simultaneous discharge of liquid from the front and rear stroke channels 40, thereby improving the filling efficiency of the syringe pump.

[0069] 3. The syringe pump of the present invention is equipped with a heating function, which can heat the viscous liquid during the suction and discharge process, greatly improving the fluidity of the liquid, making the resistance during the suction and discharge process smaller and the overall process smoother. Even if the liquid has poor fluidity, the suction and discharge action can still be completed.

[0070] 4. When the syringe pump of the present invention is in use, since the lifting and lowering of the plunger 41 is driven by the lifting mechanism 51, and the axial sliding of the spindle 33 along the flow channel 320 is driven by the second driving device 6, even if the resistance in the stroke channel 40 is very large, there is still enough thrust for the switching action of the spindle 33, so as to realize the control of the spindle 33 to control the liquid inlet or liquid outlet action.

[0071] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A dual-row multi-stage syringe pump, comprising a base and an adapter plate, a control valve, and a cavity arranged from bottom to top on the base. The cavity has two rows of stroke channels, each row including multiple stroke channels arranged in a row along a first horizontal direction. The axial direction of each stroke channel extends vertically, and a plunger is slidably sealed within each stroke channel along its respective axial direction. The control valve has multiple flow channels, each flow channel extending axially along a horizontal direction perpendicular to the first horizontal direction. Each flow channel corresponds to and communicates with two stroke channels arranged at intervals along its axial direction. A spindle is slidably disposed within each flow channel along its own axial direction and is in close contact with it. The adapter plate has an inlet channel, multiple first outlet channels, and multiple second outlet channels. The pump is characterized in that... The mandrel has grooves, a first groove, a second groove, a third groove, a first flat portion, and a second flat portion. The first groove, the second groove, and the third groove are offset from each other along the circumference of the mandrel. The first flat portion and the second flat portion are offset from each other along the circumference of the mandrel. The first groove communicates with the groove. The two ends of the first flat portion communicate with the first groove and the third groove, respectively. The second flat portion communicates with the second groove. The two rows of stroke channels are respectively designated as front stroke channels and rear stroke channels. Each stroke channel of the front stroke channel is connected to the liquid inlet channel through the grooves and first slots on each mandrel. Each stroke channel of the rear stroke channel is connected to the liquid inlet channel through the grooves, first flat portions and third slots on each mandrel. Each stroke channel of the front stroke channel is connected to each first liquid outlet channel through the grooves on each mandrel. Each stroke channel of the rear stroke channel is connected to each second liquid outlet channel through the second slots and second flat portions on each mandrel.

2. The dual-row multi-stage syringe pump according to claim 1, characterized in that, A heating rod is provided on the adapter plate, and the heating rod is parallel to the liquid inlet channel.

3. A dual-row multi-stage syringe pump according to claim 2, characterized in that, The adapter plate is also provided with at least two heating channels, each of which is parallel to the liquid inlet channel and is located between the two heating channels. Each heating channel is equipped with a heating rod.

4. A dual-row multi-stage syringe pump according to claim 1, characterized in that, The mandrel is made of ceramic material.

5. A dual-row multi-stage syringe pump according to claim 1, characterized in that, The groove is arranged along the circumference of the mandrel, and the groove is an O-shaped groove.

6. A dual-row multi-stage syringe pump according to claim 1, characterized in that, A first sealing ring is provided at the connection position between the travel channel and the flow channel. The first sealing ring is used to prevent liquid from leaking from the gap between the cavity and the control valve.

7. A dual-row multi-stage syringe pump according to claim 1, characterized in that, A second sealing ring is provided at the connection position between the flow channel and the liquid inlet channel. The second sealing ring is used to prevent liquid from leaking from the gap between the adapter plate and the control valve.

8. A dual-row multi-stage syringe pump according to claim 1, characterized in that, A variable-gap plate is provided between the adapter plate and the base. The variable-gap plate has multiple first connecting channels and multiple second connecting channels inside. One end of each of the multiple first connecting channels is connected to a corresponding number of first liquid outlet channels, and one end of each of the multiple second connecting channels is connected to a corresponding number of second liquid outlet channels. The bottom of the variable-gap plate also has multiple first straight outlet channels and second straight outlet channels. The other ends of each of the multiple first straight outlet channels are connected to a corresponding number of first connecting channels, and the other ends of each of the multiple second straight outlet channels are connected to a corresponding number of second connecting channels. The distance between the first straight outlet channels and the second straight outlet channels is greater than the distance between the first liquid outlet channels and the second liquid outlet channels.

9. A dual-row multi-stage syringe pump according to claim 8, characterized in that, The base has multiple first liquid outlets and multiple second liquid outlets vertically opened at the bottom. The multiple first liquid outlets are connected to multiple first straight outlet channels one by one, and the multiple second liquid outlets are connected to multiple second straight outlet channels one by one. Each first liquid outlet and each second liquid outlet is provided with an internal thread.

10. A dual-row multi-stage syringe pump according to claim 1, characterized in that, The top port of the travel channel is provided with a sealing structure, which includes a bushing and a seal. The top port of the travel channel has a coaxial mounting groove. The bushing is installed and fixed in the mounting groove and is coaxial with the travel channel. The inner diameter of the bushing is the same as the inner diameter of the travel channel. The seal is provided between the outer wall of the bushing and the inner wall of the mounting groove to seal the gap between the bushing and the mounting groove.

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