A micropump for pipetting

Abstract

The application discloses a micro plunger pump for pipetting, which comprises a pump body, a first detection device, a driving device and a second detection device. The pump body comprises a cavity, a pushing assembly and an adapter plug for inserting a TIP head. The pushing assembly comprises a push block and a push rod connected to the bottom of the push block. The push rod is externally provided with a spring. The top of the cavity is downwardly concave with a first recess. The push block is movably arranged in the first recess and the top of the push block exceeds the first recess. The first detection device is used for detecting whether the TIP head is inserted on the push block. The driving device comprises a bracket, a motor, a plunger assembly and a guide assembly. The guide assembly comprises a vertical guide groove and a guide column. One of the vertical guide groove and the guide column is arranged on the outer periphery of the plunger connector, and the other is arranged on the bracket. The second detection device is used for identifying the running position of the micro plunger pump. The micro plunger pump has a smaller volume, the internal space of the plunger pump is reasonably utilized, and the structure design is ingenious.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipette, in particular to a micro plunger pump for pipetting. BACKGROUND

[0002] The pipette is very mature in the current market, and the precision can also meet very high requirements, but the traditional pipette uses expensive slide rails as a guide mechanism, which has the problem of high price, and most pipettes are driven by a lead screw motor, so the overall length of the appearance is relatively long.

[0003] In order to reduce the cost, compared with the traditional pipette, we found that the plunger pump has the same working principle as the pipette, but the cost of the plunger pump is generally lower than that of the pipette. The micro plunger pump has been widely used in medicine, biology, chemistry and other fields. Its working principle is to drive the motor to run, and through the transmission mechanism, the plunger reciprocates in the cavity to compress and expand the air in the cavity, thereby realizing the functions of instrument liquid discharge and liquid suction. However, the micro plunger pump mainly has the following shortcomings in the current market: 1. The overall size is not small and convenient; 2. The plunger pump does not have the use of directly inserting the TIP head; 3. The cost is high in the application of TIP direct pipetting.

[0004] Therefore, how to miniaturize the volume and reduce the manufacturing cost is the focus of research in the industry, and it is necessary to design a new technical solution to solve the above problems. SUMMARY

[0005] Therefore, the present application aims at the defects of the prior art, and the main purpose is to provide a micro plunger pump for pipetting. The first recess is provided, and the push block can be retracted into the first recess, so that the overall volume of the micro plunger pump is smaller, and the motor can drive the plunger connector to press upward against the anti-dropping part, so that the push block can automatically lift the TIP head away from the adapter plug under the elastic force of the spring, realizing the automatic disassembly of the TIP head. At the same time, the setting of the spring can ensure that after the TIP head is disassembled from the adapter plug, the adapter plug will not shake randomly to produce abnormal sound. In combination with the settings of the first detection device and the second detection device, after the plunger connector runs to the top, the first detection device can further ensure whether the TIP head is inserted in the adapter plug, and the lead screw, the plunger connector and the plunger rod are arranged in the channel, which reasonably utilizes the internal space of the plunger pump, and uses the guide structure of the guide column and the vertical guide groove, which can further reduce the manufacturing cost of the plunger pump compared with the slide rail structure, and the structure design is ingenious.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] A micro plunger pump for pipetting comprises:

[0008] The pump body comprises a cavity, a pushing assembly and an adapter plug for inserting the TIP head, the pushing assembly comprises a pushing block and a pushing rod connected to the bottom of the pushing block, the pushing rod is sleeved with a spring, the top of the cavity is concave downward to form a first recess, the pushing block is movably arranged in the first recess and the top of the pushing block protrudes out of the first recess, the bottom wall of the first recess is downwardly provided with a through hole penetrating through the cavity, the bottom of the pushing rod penetrates through the through hole and is provided with an anti-disengagement portion, the top end of the through hole is provided with an abutting groove, the two ends of the spring are respectively abutted against the bottom of the pushing block and the bottom of the abutting groove, the bottom of the cavity is upwardly provided with a receiving cavity communicating with the first recess for sliding connection of the plunger rod, the bottom of the adapter plug is connected to the top end of the receiving cavity, and the top of the adapter plug penetrates through the pushing block upwardly and protrudes out of the top of the pushing block.

[0009] The first detection device is used for detecting whether the TIP head is inserted on the pushing block, and the first detection device comprises a first optocoupler arranged on the cavity and a first baffle connected to the bottom of the pushing block, and the bottom of the first recess is provided with a first avoiding groove for avoiding the first baffle.

[0010] The driving device comprises a bracket, a motor, a plunger assembly and a guide assembly, the bracket is connected to the bottom of the pump body, the bracket is provided with a channel penetrating upwardly and downwardly, the motor is arranged at the bottom of the bracket, the top of the motor is connected with a lead screw penetrating into the channel, the plunger assembly comprises a plunger rod and a plunger connector connected to the bottom of the plunger rod, the top of the plunger rod is slidingly connected to the receiving cavity, the bottom of the plunger connector is upwardly provided with a second avoiding groove, the bottom end of the second avoiding groove is provided with a threaded connection portion threadedly connected with the lead screw, and the guide assembly comprises a vertical guide groove and a guide column matched with the vertical guide groove, one of the vertical guide groove and the guide column is arranged on the outer periphery of the plunger connector, and the other is arranged on the bracket, and the motor can drive the plunger connector to abut against the anti-disengagement portion upwardly.

[0011] The second detection device is used for identifying the running position of the micro plunger pump, and the second detection device comprises a second optocoupler arranged on the bracket and a second baffle connected to the outer periphery of the plunger connector, and the channel is provided with a third avoiding groove for avoiding the second baffle.

[0012] As a preferred scheme, the pushing block comprises a pushing rod connecting portion and a sleeve portion extending upwardly from the top of the pushing rod connecting portion, and the top of the adapter plug protrudes out of the top of the sleeve portion.

[0013] As a preferred scheme, the bottom of the pushing rod connecting portion is concave upwardly to form a second recess, and correspondingly, the bottom wall of the first recess is provided with a boss matched with the second recess, and the boss is located at the outer periphery of the top end of the receiving cavity.

[0014] As a preferred scheme, the spring, via hole and push rod are provided with two, and the two push rods are arranged on opposite sides of the push block.

[0015] As a preferred scheme, the bottom of the adapter plug is provided with a mounting portion, the mounting portion is in interference fit with the top end of the accommodating cavity, a first sealing ring is arranged between the bottom of the adapter plug and the cavity, and the first sealing ring is located at the outer periphery of the mounting portion.

[0016] As a preferred scheme, the cavity is provided with a plurality of weight-reducing grooves.

[0017] As a preferred scheme, the bottom of the cavity is provided with a mounting plate, and the bracket is fixed to the bottom of the cavity through the mounting plate.

[0018] As a preferred scheme, the bottom of the cavity is provided with a sealing member mounting groove at the outer periphery of the accommodating cavity, a sealing member is arranged in the sealing member mounting groove and sleeved on the outer periphery of the plunger rod, and the mounting plate fixes the sealing member in the sealing member mounting groove.

[0019] As a preferred scheme, the top of the bracket is downwardly provided with a third groove at the outer periphery of the channel, the bottom of the anti-disengagement portion can be partially abutted against the bottom wall of the third groove, the bottom of the mounting plate is upwardly concave and provided with a fourth groove, and the top of the anti-disengagement portion is limited by the top wall of the fourth groove.

[0020] As a preferred scheme, the motor has a rotating rod, the lead screw is in interference fit with the outer periphery of the rotating rod and is fixed through glue dispensing.

[0021] Compared with the prior art, the present application has obvious advantages and beneficial effects, specifically, the above technical scheme can know that:

[0022] Mainly, the first groove is arranged, the push block can be retracted into the first groove, the overall volume of the micro plunger pump is smaller, the motor can drive the plunger connector to abut against the anti-disengagement portion upward, the push block can automatically separate the TIP head from the adapter plug under the elastic force of the spring, the automatic disassembly of the TIP head is realized, the arrangement of the spring can ensure that the adapter plug does not shake randomly and produce abnormal sound after the TIP head is disassembled from the adapter plug, the first detection device and the second detection device are arranged, the plunger connector can further ensure whether the TIP head is arranged on the adapter plug after the plunger connector runs to the top through the first detection device, the lead screw, the plunger connector and the plunger rod are arranged in the channel, the internal space of the plunger pump is reasonably utilized, the guide structure of the guide column and the vertical guide groove is used, compared with the slide rail structure, the manufacturing cost of the plunger pump can be further reduced, and the structure design is ingenious.

[0023] For more clearly setting forth the structural features and effects of the present application, the present application will be described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a perspective view of a preferred embodiment one of the present application;

[0025] Figure 2 is an exploded view of a preferred embodiment one of the present application;

[0026] Figure 3 is a sectional view of a preferred embodiment one of the present application;

[0027] Figure 4 is another sectional view of a preferred embodiment one of the present application;

[0028] Figure 5 is a sectional view of a preferred embodiment two of the present application.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 10, pump body 11, cavity

[0031] 111, first groove 112, via hole

[0032] 113, abutting groove 114, accommodating cavity

[0033] 115, sealing member mounting groove 116, boss

[0034] 117, first avoiding groove 12, pushing assembly

[0035] 121, push block 122, push rod

[0036] 123, spring 124, anti-dropping part

[0037] 125, push rod connecting part 126, sleeve part

[0038] 127, second groove 13, adapter plug

[0039] 131, mounting part 20, first detection device

[0040] 21, first optical coupling 22, first baffle

[0041] 30, driving device 31, support

[0042] 311, channel 312, third groove

[0043] 313, third avoiding groove 32, motor

[0044] 321, lead screw 322, rotating rod

[0045] 33, plunger assembly 331, plunger rod

[0046] 332, plunger connector 333, second avoiding slot

[0047] 334, threaded connection part 34, guide assembly

[0048] 341, vertical guide slot 342, guide column

[0049] 40, second detection device 41, second optical coupling

[0050] 42, second blocking piece 50, TIP head

[0051] 60, first sealing ring 70, sealing member

[0052] 80, mounting plate 81, fourth recess DETAILED DESCRIPTION

[0053] First of all, it needs to be pointed out that in the description of the present application, the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0054] Please refer to Figures 1 to 5 The specific structure of the various preferred embodiments of the present application is shown, which includes a pump body 10, a first detection device 20, a driving device 30 and a second detection device 40.

[0055] The pump body 10 includes a cavity 11, a pushing assembly 12 and an adapter plug 13 for inserting the TIP head 50, the pushing assembly 12 includes a push block 121 and a push rod 122 connected to the bottom of the push block 121, the push rod 122 is provided with a spring 123, the top of the cavity 11 is concave downward to form a first recess 111, the push block 121 is movably arranged in the first recess 111 and the top of the push block 121 exceeds the first recess 111, the bottom wall of the first recess 111 is downwardly provided with a through hole 112 penetrating the cavity 11, the bottom of the push rod 122 penetrates the through hole 112 and is provided with an anti-disengagement part 124, the top end of the through hole 112 is provided with an abutting slot 113, the two ends of the spring 123 are respectively abutted to the bottom of the push block 121 and the bottom of the abutting slot 113, the bottom of the cavity 11 is upwardly provided with a receiving cavity 114 communicating with the first recess 111 for sliding connection of the plunger rod 331, the bottom of the adapter plug 13 is connected to the top end of the receiving cavity 114, the top of the adapter plug 13 penetrates the push block 121 upwardly and protrudes from the top of the push block 121;

[0056] Specifically, referring to Figure 2 and Figure 3 As shown in the drawings, the push block 121 comprises a push rod connecting portion 125 and a sleeve portion 126 extending upward from the top of the push rod connecting portion 125, the top of the adapter plug 13 protrudes from the top of the sleeve portion 126; the bottom of the adapter plug 13 is provided with a mounting portion 131, the mounting portion 131 is in interference fit with the top end of the accommodating cavity 114, the bottom of the adapter plug 13 and the cavity 11 are clamped with a first sealing ring 60, the first sealing ring 60 is located on the outer periphery of the mounting portion 131; the bottom of the cavity 11 is provided with a sealing member mounting groove 115 on the outer periphery of the accommodating cavity 114, the sealing member mounting groove 115 is provided with a sealing member 70 sleeved on the outer periphery of the plunger rod 331, the sealing member 70 comprises a second sealing ring and an O-ring provided on the top of the second sealing ring;

[0057] Preferably, referring to Figure 5 As shown in the drawings, the bottom of the push rod connecting portion 125 is recessed upward to form a second recess 127, correspondingly, the bottom wall of the first recess 111 is provided with a boss 116 matched with the second recess 127, the boss 116 is located on the outer periphery of the top end of the accommodating cavity 114, the second recess 127 is provided with a guide surface, which facilitates the insertion and guidance of the push rod connecting portion 125; the spring 123, the through hole 112 and the push rod 122 are provided with two, two push rods 122 are arranged on the opposite sides of the push block 121, so that the pushing of the push block 121 is more stable; in this embodiment, the cavity 11 can be provided with a plurality of weight-reducing grooves, which are arranged around the outer periphery of the first recess 111 and the accommodating cavity 114, so as to reduce the weight of the cavity 11 and make the whole lighter.

[0058] The first detection device 20 is used for detecting whether the TIP head 50 is inserted on the push block 121, the first detection device 20 comprises a first optocoupler 21 arranged on the cavity 11 and a first baffle 22 connected to the bottom of the push block 121, the first baffle 22 is integrally formed with the push rod connecting portion 125, the bottom of the first recess 111 is provided with a first avoiding groove 117 for the first baffle 22 to avoid.

[0059] The driving device 30 comprises a support 31, a motor 32, a plunger assembly 33 and a guide assembly 34, the support 31 is connected to the bottom of the pump body 10, the support 31 is provided with a through channel 311, the motor 32 is arranged at the bottom of the support 31, the top of the motor 32 is connected with a lead screw 321 extending into the channel 311, the plunger assembly 33 comprises a plunger rod 331 and a plunger connector 332 connected to the bottom of the plunger rod 331, the top of the plunger rod 331 is slidingly connected in the accommodating cavity 114, the bottom of the plunger connector 332 is provided with a second avoiding groove 333 upwardly, the bottom end of the second avoiding groove 333 is provided with a threaded connecting part 334 threadedly connected with the lead screw 321, the guide assembly 34 comprises a vertical guide groove 341 and a guide column 342 matched with the vertical guide groove 341, the vertical guide groove 341 is provided on the outer periphery of the plunger connector 332, the guide column 342 is fixed on the support 31, the motor 32 can drive the plunger connector 332 to press upwardly against the anti-off part 124, preferably, the guide assembly 34 is provided with two oppositely arranged ones, so that the guidance is more accurate and stable.

[0060] Referring to Figs. 1-4, Figure 3 and Figure 4 The bottom of the cavity 11 is provided with a mounting plate 80, the mounting plate 80 fixes the sealing member 70 in the sealing member mounting groove 115, the support 31 is fixed on the bottom of the cavity 11 through the mounting plate 80, the top of the support 31 is provided with a third groove 312 downwardly on the outer periphery of the channel 311, the bottom of the anti-off part 124 can be partially abutted against the bottom wall of the third groove 312, the bottom of the mounting plate 80 is concavely provided with a fourth groove 81 upwardly, the top of the anti-off part 124 is limited by the top wall of the fourth groove 81, the motor 32 has a rotating rod 322, the lead screw 321 is interference-fitted with the outer periphery of the rotating rod 322 and is fixed by glue-dipping; the plunger rod 331 and the plunger connector 332 are fixed by glue-dipping.

[0061] The second detection device 40 is used for identifying the running position of the micro plunger pump, the detection position is found before running as zero position, and the suction and discharge actions of the micro plunger pump are calculated according to the position, the second detection device 40 comprises a second optocoupler 41 arranged on the support 31 and a second baffle 42 connected to the outer periphery of the plunger connector 332, the outer periphery of the plunger connector 332 is concavely provided with a groove, the second baffle 42 is fixed in the groove by glue-dipping, and the channel 311 is provided with a third avoiding groove 313 for the second baffle 42 to move and avoid.

[0062] In the embodiment, the pushing assembly 12, the cavity 11, the bracket 31, the mounting plate 80 and the like can be made by injection molding, compared with the traditional pipette in which most parts are machined, the cost of the pipette modified from the plunger pump can be significantly reduced under the condition of mass production.

[0063] The working principle of the embodiment is described as follows:

[0064] When the motor 32 rotates, the kinematic pair composed of the lead screw 321 and the plunger connecting head 332 converts the rotation of the lead screw 321 into the up-down linear motion of the plunger connecting head 332, and the plunger connecting head 332 drives the plunger rod 331 to move up and down in the accommodating cavity 114 to achieve the effect of expanding or compressing air, thereby realizing the function of liquid suction and discharge.

[0065] When the plunger connecting head 332 reaches the highest position, the plunger connecting head 332 will push the push rod 122, and at this time, due to the arrangement of the spring 123, the elastic force of the spring 123 will drive the push block 121 to move upward, and when moving to a certain distance, the push block 121 will push off the TIP head 50 on the adapter plug 13, and after pushing off, the push block 121 will return to the position supported by the spring 123, at this time, the original light-blocking part of the first baffle 22 can no longer block light through the first detection device 20, thereby obtaining the conclusion that the TIP head 50 has been pushed off, otherwise it proves that the TIP head 50 is still inserted on the adapter plug 13.

[0066] When the TIP head 50 is installed on the adapter plug 13, the spring 123 will be compressed, and the bottom of the anti-disengagement part 124 abuts against the bottom wall of the third groove 312.

[0067] The design focus of the present application is:

[0068] The main point is that the push block can be retracted into the first groove, so that the overall volume of the micro plunger pump is smaller, and the motor can drive the plunger connecting head to abut against the anti-disengagement part, so that the push block can automatically lift the TIP head away from the adapter plug under the elastic force of the spring, realizing the automatic disassembly of the TIP head, and the spring can ensure that the adapter plug does not shake randomly and produce abnormal sound after the TIP head is disassembled from the adapter plug, and the first detection device and the second detection device are arranged, so that the first detection device can further ensure whether the TIP head is inserted on the adapter plug after the plunger connecting head runs to the top, and the lead screw, the plunger connecting head and the plunger rod are arranged in the channel, reasonably utilizing the internal space of the plunger pump, and using the guide structure of the guide column and the vertical guide groove, compared with the slide rail structure, the manufacturing cost of the plunger pump can be further reduced, and the structure design is ingenious.

[0069] The above merely describes preferred embodiments of the present application, and is not intended to limit the technical scope of the present application in any way. Any minor modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application shall still fall within the technical scope of the present application.

Claims

1. A micropump for pipetting, characterized in that The utility model provides a pump body, the pump body includes cavity, pusher assembly and the adapter plug that TIP head can be inserted, the pusher assembly includes push block and the push rod fixedly connected in the bottom of push block, the push rod is equipped with spring, the top of cavity is concave and is provided with first recess downwards, push block is movably arranged in first recess and the top of push block is beyond first recess, the bottom wall of first recess is provided with through hole that passes through the cavity downwards, the bottom of push rod passes through through hole and is provided with anti -drop part, the top of through hole is provided with abutment groove, the both ends of spring respectively abut on the bottom of push block and the bottom of abutment groove, the bottom of cavity is provided with accommodating cavity that is communicated with first recess and is used for plunger rod sliding connection, the bottom of adapter plug is connected to the top of accommodating cavity, the top of adapter plug passes through push block and protrudes on the top of push block upwards, push block includes push rod connecting portion and sleeve portion that extends upwards from the top of push rod connecting portion, the top of adapter plug protrudes on the top of sleeve portion. The utility model provides a first detection device, first detection device is used for detecting whether TIP head is inserted on push block, first detection device includes first photocoupler set up on cavity and first baffle connected in the bottom of push block, first baffle is integrally formed with push rod connecting portion, the bottom of first recess is provided with first avoiding slot for the first baffle to move and avoid. The utility model provides a drive device, drive device includes support, motor, plunger assembly and guide assembly, the bottom of support is connected with pump body, the bottom of cavity is provided with mounting plate, the bottom of cavity is fixed to the bottom of cavity through mounting plate, the bottom of cavity is provided with sealing element installation groove on the outer periphery of accommodating cavity, the sealing element installation groove is provided with sealing element that is sleeved on the outer periphery of plunger rod, the sealing element is fixed in sealing element installation groove through mounting plate, the support is provided with the passage that passes through up and down, the bottom of motor is provided with the screw rod that is connected with the top of motor and extends into the passage, plunger assembly includes plunger rod and plunger connector that is connected in the bottom of plunger rod, the top of plunger rod is slidably connected in accommodating cavity, the bottom of plunger connector is provided with the second avoiding slot upwards, the bottom of second avoiding slot is provided with the threaded connection portion that is threadedly connected with screw rod, guide assembly includes vertical guide slot and guide column that is matched with vertical guide slot, one of vertical guide slot and guide column is provided with the outer periphery of plunger connector, and the other is provided on the support, and the motor can drive plunger connector to press against anti -drop part upwards. The utility model provides a second detection device, second detection device is used for identifying the running position of micro plunger pump, second detection device includes second photocoupler set up on support and second baffle connected with the outer periphery of plunger connector, the passage is provided with third avoiding slot for the second baffle to move and avoid. The bottom of push rod connecting portion is concave and is provided with second recess upwards, correspondingly, the bottom wall of first recess is provided with the boss that is matched with second recess, and the boss is located on the outer periphery of the top of accommodating cavity.

2. A micropiston pump for pipetting according to claim 1, characterized in that: The spring, through hole and push rod are provided with two, and two push rods are arranged on the opposite sides of push block.

3. A micropiston pump for pipetting according to claim 1, characterized in that: ​ 4. A micropiston pump for pipetting according to claim 1, characterized in that: The bottom of the adapter plug is provided with a mounting portion which is in interference fit with the top end of the accommodating cavity, and a first sealing ring is arranged between the bottom of the adapter plug and the cavity, and the first sealing ring is located at the outer periphery of the mounting portion.

5. A micropiston pump for pipetting according to claim 1, characterized in that: The cavity is provided with a plurality of air slots for weight reduction.

6. A micropiston pump for pipetting according to claim 1, characterized in that: The top of the bracket is downwardly provided with a third groove at the outer periphery of the channel, the bottom of the anti-extraction portion can be partially abutted against the bottom wall of the third groove, the bottom of the mounting plate is upwardly concave with a fourth groove, and the top of the anti-extraction portion is limited by the top wall of the fourth groove.

7. A micropiston pump for pipetting according to claim 1, characterized in that: The motor has a rotating rod, the lead screw is in interference fit with the outer periphery of the rotating rod and is fixed by glue dispensing.

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