Pipette connectors, pipette tips and pipetting devices

Abstract

The embodiment of the utility model provides a pipetting connector, a pipetting head and a pipetting device, which relate to the field of pipetting technology. The pipetting connector includes a connector body and a first elastic sealing ring, the connector body is provided with a through hole, the through hole is used to connect the piston cavity, the first elastic sealing ring is sleeved on the connector body, the first elastic sealing ring is used to elastically abut the TIP head, because the first elastic sealing ring is used to elastically abut the TIP head to achieve the function of taking the TIP head, the first elastic sealing ring is easy to deform, the pressure required to take the TIP head is reduced, and the motor power requirement is reduced. At the same time, the height consistency between multiple TIP heads can be improved, and the airtightness of the pipetting process can also be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid transfer, in particular to a liquid transfer connector, a liquid transfer head and a liquid transfer device. Background Art

[0002] The pipetting device can perform rapid and accurate quantitative sampling and addition operations on liquid samples and reagents, thereby effectively shortening sample preparation and testing time and improving sample testing accuracy. In order to avoid cross-contamination between samples and ensure the accuracy of sample test results, the automated pipetting device needs to use disposable pipette tips, i.e., TIP tips, during the pipetting process.

[0003] In the prior art, the connector used to remove the TIP head uses a rigid protrusion to contact the TIP head, which requires a high-power motor to ensure a large pressure to remove the TIP head. Utility Model Content

[0004] The utility model provides a liquid transfer connector, a liquid transfer head and a liquid transfer device, which can reduce the power requirement for a motor.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the utility model provides a pipetting connector, comprising:

[0007] A connector body, wherein the connector body is provided with a through hole, and the through hole is used to communicate with the piston cavity; and

[0008] A first elastic sealing ring, wherein the first elastic sealing ring is sleeved on the connector body and is used for elastically abutting against the TIP head.

[0009] In an optional embodiment, the connector body is in a cylindrical structure, the inner side of the first elastic sealing ring abuts against the peripheral wall of the connector body, and the outer side of the first elastic sealing ring is used to abut against the TIP head.

[0010] In an optional embodiment, the pipetting connector is provided with an annular mounting groove, which surrounds the axis of the connector body, the first elastic sealing ring is arranged in the annular mounting groove, and the inner side of the first elastic sealing ring is used to abut the inner wall of the annular mounting groove.

[0011] In an optional embodiment, the pipetting connector further comprises an annular rigid protrusion, wherein the annular rigid protrusion is disposed on the connector body, the annular rigid protrusion surrounds the axis of the connector body, and the annular rigid protrusion and the first elastic sealing ring are spaced apart.

[0012] In an optional embodiment, the pipetting connector further comprises a second elastic sealing ring, which is sleeved on the connector body, the first elastic sealing ring and the second elastic sealing ring are spaced apart, and the second elastic sealing ring is used for elastically abutting the TIP head.

[0013] In the second aspect, the utility model provides a pipette head, comprising a piston cavity, a piston rod and a pipette connector as described in any one of the aforementioned embodiments, wherein the piston rod can be slidably engaged with the piston cavity, the connector body is connected to the piston cavity, the connector body is provided with a through hole, and the through hole is connected to the piston cavity.

[0014] In an optional embodiment, the pipetting head further includes at least one magnetic member, and the at least one magnetic member is disposed in the piston cavity; or, the pipetting head further includes at least one detection protrusion, and the at least one detection protrusion is disposed in the piston cavity.

[0015] In an optional embodiment, the pipetting head further includes a limit member, which is telescopically disposed in the piston cavity, and is used to pass through the limit hole when extended, or to disengage from the limit hole when retracted.

[0016] In a third aspect, the utility model provides a pipetting device, comprising a mounting frame and the pipetting head described in the aforementioned embodiment or the aforementioned embodiment, wherein the pipetting head is mounted on the mounting frame.

[0017] In an optional embodiment, the mounting bracket is provided with a limiting hole, and the pipetting head further comprises a limiting member, which is telescopically arranged in the piston cavity, and the limiting member is used to pass through the limiting hole when extended, or the limiting member is used to disengage from the limiting hole when retracted.

[0018] The beneficial effects of the pipetting connector, pipetting head and pipetting device of the embodiments of the present invention include, for example:

[0019] The utility model provides a liquid transfer connector, which comprises a connector body and a first elastic sealing ring. The connector body is provided with a through hole, which is used to communicate with a piston cavity. The first elastic sealing ring is sleeved on the connector body, and the first elastic sealing ring is used to elastically abut against a TIP head. Since the first elastic sealing ring is used to elastically abut against the TIP head, the first elastic sealing ring is easy to deform, so as to realize the function of taking the TIP head, reduce the pressure required for taking the TIP head, and reduce the power requirement for the motor.

[0020] The utility model provides a pipetting head, which comprises a piston cavity, a piston rod and the above-mentioned pipetting connector, wherein the piston rod can be slidably matched with the piston cavity, the connector body is connected to the piston cavity, the connector body is provided with a through hole, the through hole is communicated with the piston cavity, and the pipetting head has all the functions of the above-mentioned pipetting connector.

[0021] The utility model provides a liquid transfer device, which comprises a mounting frame and the above-mentioned liquid transfer head. The liquid transfer head is mounted on the mounting frame, and the liquid transfer device has all the functions of the above-mentioned liquid transfer head. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of a pipetting head and a TIP head provided in an embodiment of the utility model;

[0024] Figure 2 A cross-sectional view of a pipetting head provided in an embodiment of the utility model;

[0025] Figure 3 A schematic diagram of a partial structure of a pipetting connector provided in an embodiment of the present utility model extending into a TIP head;

[0026] Figure 4 A schematic diagram of a limiter and a magnetic member of a pipetting head provided in an embodiment of the utility model;

[0027] Figure 5 A schematic diagram of a detection board provided in an embodiment of the utility model;

[0028] Figure 6 A schematic diagram of a pipetting head provided in an embodiment of the utility model installed on a mounting frame;

[0029] Figure 7 This is a schematic diagram of the mounting frame and the limiting member before they come into contact with each other in an embodiment of the present utility model;

[0030] Figure 8 It is a schematic diagram of the mounting frame and the limiting member provided in the embodiment of the utility model after being matched;

[0031] Fig. 9 It is a schematic diagram of a fastener, a pressing block, a piston cavity and a mounting frame provided in other embodiments of the utility model;

[0032] Fig.10 This is a schematic diagram of a partial structure of a pipetting connector extending into a TIP head in other embodiments of the present invention.

[0033] Icons: 100-pipette connector; 110-connector body; 111-through hole; 112-annular mounting groove; 120-first elastic sealing ring; 130-annular rigid protrusion; 1000-pipette head; 200-piston cavity; 300-piston rod; 400-magnetic part; 500-limiting part; 600-piston rod fixing plate; 710-retracting plate; 720-guide rod; 730-resetting part; 800-first sealing part; 900-second sealing part; 2100-mounting frame; 2101-first mounting groove; 2200-detection plate; 2300-fastener; 2400-pressing block; 10-TIP head. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0038] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0039] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0040] As mentioned in the background technology, the pipetting device can perform rapid and accurate quantitative sampling and addition operations on liquid samples and reagents, thereby effectively shortening the sample preparation and detection time and improving the accuracy of sample detection. In order to avoid cross-contamination between samples and ensure the accuracy of sample detection results, the automated pipetting device needs to use a disposable pipette tip, i.e., a TIP tip, during the pipetting process.

[0041] In the prior art, a connector (in the shape of a gourd head) used to take the TIP head adopts a rigid protrusion to contact the TIP head, which requires a high-power motor to ensure a large pressure to achieve a stable connection between the connector and the TIP head. At the same time, after the rigid protrusion contacts the TIP head, the TIP head has a large rebound, resulting in poor height consistency between multiple TIP heads. The connector with a rigid protrusion can only be adapted to a small number of TIP heads of certain specifications.

[0042] In addition, the pipetting device in the prior art only has a single specification of pipetting head and does not have the function of quickly replacing the pipetting head 1000. At the same time, for a pipetting head with multiple channels, when multiple TIP heads are connected at the same time, it is difficult to ensure that the rigid protrusion of each connector is in good contact with the TIP head, which requires good consistency and high precision in the processing of the connector, but this makes the production cost of the connector very high.

[0043] In view of this, please refer to Figure 1-Figure 10 The pipetting connector 100, pipetting head 1000 and pipetting device provided in the embodiments of the present invention can solve this problem, which will be described in detail below.

[0044] Please refer to Figure 1 , Figure 2 and Figure 6 The utility model provides a pipetting device, which includes a mounting frame 2100 and a pipetting head 1000. The pipetting head 1000 is mounted on the mounting frame 2100. Specifically, the pipetting head 1000 includes a piston cavity 200, a piston rod 300 and the above-mentioned pipetting connector 100. The piston rod 300 can be slidably matched with the piston cavity 200. The connector body 110 is connected to the piston cavity 200. The connector body 110 is provided with a through hole 111, and the through hole 111 is connected to the piston cavity 200.

[0045] The pipetting connector 100 of the pipetting head 1000 can reduce the power requirement for the motor, and at the same time, can improve the height consistency between multiple TIP heads 10, and can also ensure the airtightness of the pipetting process.

[0046] It is easy to understand that in this embodiment, the pipetting head 1000 is a multi-channel pipetting head 1000, that is, the piston cavity 200 has multiple piston chambers, the through hole 111 of the pipetting connector 100 is connected to the piston chamber, the number of piston rods 300 and the number of pipetting connectors 100 are also multiple, and the multiple piston chambers, the multiple piston rods 300 and the multiple pipetting connectors 100 correspond one to one.

[0047] The pipetting head 1000 also includes a piston rod fixing plate 600 and a pipetting motor. The pipetting motor can be installed on the mounting frame 2100. The piston rod fixing plate 600 is connected to all the piston rods 300. The pipetting motor is connected to the piston rod fixing plate 600. The piston rod fixing plate 600 is driven up and down by the pipetting motor (such as a screw motor), and then the piston rod 300 can be moved up and down in the piston chamber, thereby realizing the TIP head 10 to absorb or spray liquid.

[0048] Please refer to Figure 3 The pipetting connector 100 includes a connector body 110 and a first elastic sealing ring 120 . The connector body 110 is provided with a through hole 111 , which is used to connect to the piston cavity 200 . The first elastic sealing ring 120 is sleeved on the connector body 110 , and is used to elastically abut the TIP head 10 .

[0049] Since the first elastic sealing ring 120 is elastically abutted against the TIP head 10 , the first elastic sealing ring 120 is easily deformed to achieve the function of taking out the TIP head 10 , reduce the pressure required for taking out the TIP head 10 , and reduce the power requirement for the motor.

[0050] The motor here can be understood as a motor used to drive the movement of the pipetting head 1000. The motor can be connected to the mounting frame 2100, and by driving the mounting frame 2100 to move downward, the pipetting head 1000 can be driven to move downward, so that the pipetting connector 100 of the pipetting head 1000 can approach and contact the TIP head 10, thereby realizing the process of taking the TIP head 10. At the same time, it is easy to understand that since the pressure required to take the TIP head 10 is reduced, the motor power requirement is reduced, and the structural strength of the relevant transmission system in the pipetting device can also be reduced.

[0051] At the same time, when taking the TIP head 10, due to the use of the pipetting connector 100 with the first elastic sealing ring 120 made of elastic material, the resilience of the Tip head is reduced after the first elastic sealing ring 120 contacts the TIP head 10. In this way, the height difference between the multiple TIP heads can be reduced, thereby improving the height consistency between the multiple TIP heads 10, and also ensuring that each pipetting connector 100 is in good contact with the TIP head 10, thereby improving the airtightness between the pipetting connector 100 and the TIP head 10.

[0052] In addition, it can also be easily adapted to TIP heads of various specifications, such as 20ul, 50ul, 200ul and 1000ul TIP heads.

[0053] It should be noted that, in the present embodiment, the connector body 110 has a columnar structure. Specifically, the connector body 110 has a cylindrical structure, and the cylindrical structure is provided with a through hole 111 .

[0054] The inner side of the first elastic sealing ring 120 abuts against the peripheral wall of the pipetting connector 100, and the outer side of the first elastic sealing ring 120 is used to abut against the TIP head 10. The first elastic sealing ring 120 is supported by a soft elastic material, such as rubber, silicone rubber, fluororubber, hydrogenated nitrile rubber (HNBR), ethylene propylene diene monomer rubber (EPDM) or thermoplastic elastomer.

[0055] In addition, in order to facilitate the installation of the first elastic sealing ring 120, the connector body 110 is provided with an annular mounting groove 112, which surrounds the axis of the connector body 110, and the first elastic sealing ring 120 is arranged in the annular mounting groove 112, and the inner side of the first elastic sealing ring 120 is used to abut the inner wall of the annular mounting groove 112.

[0056] The first elastic sealing ring 120 may be an annular seal (ie, an O-ring), and the inner diameter of the first elastic sealing ring 120 is smaller than the maximum outer diameter of the pipetting connector 100 , thereby ensuring that the first elastic sealing ring 120 can be fixed in the annular mounting groove 112 .

[0057] It should be noted that, in this embodiment, the pipetting connector 100 further includes an annular rigid protrusion 130, the annular rigid protrusion 130 and the first elastic sealing ring 120 are spaced apart, and the height of the annular rigid protrusion 130 is greater than the height of the first elastic sealing ring 120. Of course, in some embodiments, such as Fig.10 As shown, it is also possible that the height of the annular rigid protrusion 130 is smaller than the height of the first elastic sealing ring 120 .

[0058] The annular rigid protrusion 130 is disposed on the connector body 110 , and the annular rigid protrusion 130 surrounds the axis of the connector body 110 . The annular rigid protrusion 130 and the first elastic sealing ring 120 can simultaneously abut against the inner wall of the TIP head 10 , thereby achieving a positioning effect on the TIP head 10 .

[0059] For example, when the lower end of the TIP head contacts the side wall of the consumable hole during pipetting, the TIP head can be prevented from tilting.

[0060] Among them, in this embodiment, the end of the pipetting connector 100 away from the annular rigid protrusion 130 is a guiding end, which is similar to a sphere, and the annular mounting groove 112 and the first elastic sealing ring 120 are arranged at the guiding end. Since the annular rigid protrusion 130 is also similar to a circular arc protrusion, the pipetting connector 100 in this embodiment is similar to a gourd head.

[0061] In the process of taking out the TIP head 10, the guide end of the pipetting connector 100 first contacts the inner wall of the Tip head, playing a guiding role. As the depth of the pipetting connector 100 extending into the TIP head 10 increases, the first elastic sealing ring 120 contacts the inner wall of the Tip head until the first elastic sealing ring 120 is completely compressed in the annular mounting groove 112. The first elastic sealing ring 120 contacts the inner wall of the Tip head, the first elastic sealing ring 120 is compressed, and plays a sealing role to ensure the airtightness of the pipetting process.

[0062] In addition, it should be noted that in other embodiments, the pipetting connector 100 may also include a second elastic sealing ring, which is sleeved on the connector body 110, and the first elastic sealing ring 120 and the second elastic sealing ring are spaced apart, and the second elastic sealing ring is also used to elastically abut the TIP head 10.

[0063] At this time, it is equivalent to using the first elastic sealing ring 120 and the second elastic sealing ring to elastically abut the inner wall of the TIP head 10 , and the annular rigid protrusion 130 may not be provided, or the annular rigid protrusion 130 does not abut the inner wall of the TIP head 10 .

[0064] Please refer again Figure 1 and Figure 2 In order to facilitate the process of withdrawing the TIP head of the pipetting device, the pipetting head 1000 also includes a head withdrawal plate 710, a guide rod 720 and a reset member 730. The reset member 730 can be a spring. The reset member 730 is sleeved on the outside of the guide rod 720. The guide rod 720 can be slidably penetrated into the piston cavity 200. The reset member 730 is used to elastically abut the piston cavity 200 and the upper end of the guide rod 720 at the same time. The lower end of the guide rod 720 is connected to the head withdrawal plate 710.

[0065] When the pipetting motor drives the piston rod fixing plate 600 to move downward, the piston rod fixing plate 600 contacts the upper end of the guide rod 720, drives the guide rod 720 to move downward, and drives the head withdrawal plate 710 to move downward. The head withdrawal plate 710 contacts the TIP head 10, presses the TIP head 10 downward, and separates the TIP head 10 from the pipetting connector 100, completing the process of withdrawing the TIP head. During this process, the inner wall of the TIP head and the first elastic sealing ring 120 will undergo relative displacement, and the sliding reset member 730 will be compressed.

[0066] After the process of withdrawing the TIP head is completed, the liquid transfer motor drives the piston rod fixing plate 600 to move upward and return to the position ready for liquid aspiration. Under the elastic force of the reset member 730, the guide rod 720 returns to the initial position.

[0067] In addition, in order to improve the air tightness during the pipetting process, the pipetting head 1000 further includes a first seal 800 and a second seal 900 . The first seal 800 is a plate structure, and each piston rod 300 can be slidably disposed in the first seal 800 .

[0068] A second seal 900 is provided at the upper end of each pipetting connector 100 . The second seal 900 is sleeved on the outer side of the upper end of the pipetting connector 100 . The second seal 900 is located in the piston chamber. The second seal 900 can abut the pipetting connector 100 and the piston chamber 200 at the same time.

[0069] Please refer to Figure 4 , Figure 6-Figure 8 In addition, in order to facilitate the rapid replacement of pipetting heads 1000 of different specifications, the mounting frame 2100 is provided with a limiting hole, and the pipetting head 1000 also includes a limiting member 500, which is telescopically arranged in the piston cavity 200, and the limiting member 500 is used to pass through the limiting hole when extended, or, the limiting member 500 is used to disengage from the limiting hole when retracted.

[0070] There are two limiting holes and two limiting members 500 , each limiting member 500 corresponds to one limiting hole. One limiting member 500 can be understood as a long locking head with a cylindrical structure, and the other limiting member 500 can be understood as a short locking head with a spherical structure.

[0071] It is easy to understand that, in order to facilitate the automatic extension of the limiting member 500 , two elastic members (such as springs) are further provided in the piston cavity 200 , and each elastic member is used to elastically abut the limiting member 500 .

[0072] like Figure 7 As shown, during the installation of the pipette head 1000, part of the structure of the mounting frame 2100 (which can be understood as a stop plate with a guide slope, and the stop plate has a limiting hole) moves downward, and the short locking head first contacts the guide slope of the stop plate, and the short locking head begins to shrink. Finally, under the elastic action of the elastic member, part of the structure of the short locking head extends into the limiting hole. Similarly, the process of the long locking head extending into the limiting hole can refer to the above-mentioned process of the short locking head extending into the limiting hole, thereby completing the installation of the pipette head 1000 on the mounting frame 2100.

[0073] The long locking head is mainly used to prevent the pipetting head 1000 from falling, while the short locking head plays an auxiliary role in preventing the pipetting head 1000 from falling.

[0074] like Figure 8 As shown, when the pipetting head 1000 needs to be disassembled, a tool (such as a hexagon socket) can be used to pass through the limiting hole in the direction close to the short lock head (such as Figure 8 Press the long lock head (in the direction indicated by the middle arrow) to retract the long lock head, and the long lock head is separated from the limiting hole, so that the pipette head 1000 can be easily removed.

[0075] Of course, in other embodiments, the pipetting head 1000 may be mounted on the mounting frame 2100 in other ways. Fig. 9 The pipetting device also includes a fastener 2300 and a pressure block 2400. The mounting frame 2100 is provided with a first mounting groove 2101. The left side structure of the piston cavity 200 of the pipetting head 1000 slides into the first mounting groove 2101. The mounting frame 2100 is also provided with a second mounting groove. The right side structure of the piston cavity 200 of the pipetting head 1000 is arranged in the second mounting groove. At the right side position of the piston cavity 200 of the pipetting head 1000, the fastener 2300 (such as a screw) simultaneously connects the mounting frame 2100 and the pressure block 2400. By screwing the fastener 2300, the pressure block moves upward, and the mounting frame 2100 and the pressure block 2400 jointly clamp the right side structure of the piston cavity 200 of the pipetting head 1000, thereby completing the installation of the pipetting head 1000 on the mounting frame 2100.

[0076] In the case where it is necessary to remove the pipette head 1000, the pressing block 2400 can be moved downward by screwing the fastener 2300. It should be noted that in order to facilitate the downward movement of the pressing block 2400 during the screwing of the fastener, rather than the up and down movement of the fastener 2300, the pipette device also includes an elastic member. For example, the elastic member can be a spring. The elastic member elastically abuts against the pressing block and the mounting frame 2100 at the same time, so that when the fastener 2300 is screwed, the pressing block 2400 can be moved downward. At this time, the pressing block 2400 and the mounting frame 2100 no longer clamp the right side structure of the piston cavity 200, so that the pipette head 1000 is easily removed.

[0077] Please refer to Figure 4 and Figure 5 In addition, in order to detect whether the pipetting head 1000 is installed in place and to facilitate knowing which specification of the pipetting head 1000 is configured for the pipetting device, the pipetting head 1000 also includes at least one magnetic member 400 (for example, a magnet can be selected), and at least one magnetic member 400 is arranged in the piston cavity 200, for example, one magnetic member 400, two magnetic members 400, or three magnetic members 400 are arranged in the piston cavity 200.

[0078] At the same time, a detection plate 2200 is provided on the mounting frame 2100. The detection plate 2200 has a Hall sensor to detect the number of magnetic parts 400 on the pipette head 1000. Generally speaking, different pipette heads 1000 have different numbers of magnetic parts 400, so that pipette heads 1000 of different specifications can be identified.

[0079] Alternatively, there are two magnetic mounting positions (which can be understood as a first mounting position and a second mounting position) on the piston chamber 200 of the pipette head 1000. In this case, a magnet is set at the first mounting position, and no magnet is set at the second mounting position, to represent a first specification of the pipette head 1000. Alternatively, a magnet is set at the first mounting position, and a magnet is also set at the second mounting position, to represent a second specification of the pipette head 1000. Alternatively, no magnet is set at the first mounting position, and a magnet is set at the second mounting position, to represent a third specification of the pipette head 1000.

[0080] At the same time, the detection board 2200 with the Hall sensor can detect magnets at different positions, and identify the different specifications of the pipette heads 1000 mentioned in the above content (i.e., the first specification of the pipette head 1000, the second specification of the pipette head 1000, and the third specification of the pipette head 1000) according to the data and arrangement distribution of the magnets.

[0081] That is to say, by using different numbers of magnetic parts and the position arrangement of the magnetic parts, it is possible to achieve the effect of distinguishing pipetting heads 1000 of different specifications.

[0082] Of course, in other embodiments, the pipetting head 1000 also includes at least one detection protrusion (not shown), which can be understood as a boss structure, and at least one detection protrusion is arranged in the piston cavity 200, for example, one detection protrusion, two detection protrusions, or three detection protrusions are arranged in the piston cavity 200.

[0083] At the same time, a micro switch is provided on the mounting frame 2100, and the detection process is realized by the detection protrusion contacting the micro switch. For example, the micro switch can detect the number of detection protrusions on the pipette head 1000. Generally speaking, different pipette heads 1000 have different numbers of detection protrusions, thereby being able to identify pipette heads 1000 of different specifications.

[0084] Alternatively, there are two protrusion mounting positions (which can be understood as a first mounting position and a second mounting position) on the piston cavity 200 of the pipette head 1000. In this case, a detection protrusion is set at the first mounting position, and no detection protrusion is set at the second mounting position, to represent a first specification of the pipette head 1000. Alternatively, a detection protrusion is set at the first mounting position, and a detection protrusion is also set at the second mounting position, to represent a second specification of the pipette head 1000. Alternatively, no detection protrusion is set at the first mounting position, and a detection protrusion is set at the second mounting position, to represent a third specification of the pipette head 1000.

[0085] Of course, the detection protrusion may be detachably provided on the piston cavity 200 , or the detection protrusion may be integrally formed with the piston cavity 200 .

[0086] At the same time, the micro switch can detect detection protrusions at different positions, and according to the data and arrangement distribution of the detection protrusions, it can identify the different specifications of the pipette heads 1000 mentioned in the above content (i.e., the first specification of the pipette head 1000, the second specification of the pipette head 1000, and the third specification of the pipette head 1000). In summary, the pipette connector 100 includes a connector body 110 and a first elastic sealing ring 120. The connector body 110 is provided with a through hole 111, and the through hole 111 is used to connect the piston cavity 200. The first elastic sealing ring 120 is sleeved on the connector body 110. The first elastic sealing ring 120 is used to elastically abut the TIP head 10. Since the first elastic sealing ring 120 is used to elastically abut the TIP head 10, the function of taking the TIP head 10 is realized, the pressure required to take the TIP head 10 is reduced, and the power requirement for the motor is reduced.

[0087] The pipetting head 1000 includes a piston cavity 200, a piston rod 300 and the above-mentioned pipetting connector 100, the piston rod 300 can be slidably matched with the piston cavity 200, the connector body 110 is connected to the piston cavity 200, the connector body 110 is provided with a through hole 111, and the through hole 111 is connected to the piston cavity 200. The pipetting head 1000 has all the functions of the above-mentioned pipetting connector 100.

[0088] The pipetting device comprises a mounting frame 2100 and the above-mentioned pipetting head 1000 . The pipetting head 1000 is mounted on the mounting frame 2100 . The pipetting device has all the functions of the above-mentioned pipetting head 1000 .

[0089] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A pipetting connector, characterized in that: include: A connector body (110), wherein the connector body (110) is provided with a through hole (111), and the through hole (111) is used to communicate with the piston cavity (200); and A first elastic sealing ring (120), wherein the first elastic sealing ring (120) is sleeved on the connector body (110), and the first elastic sealing ring (120) is used for elastically abutting against the TIP head (10).

2. The pipetting connector according to claim 1, characterized in that: The connector body (110) is of a columnar structure, the inner side of the first elastic sealing ring (120) abuts against the peripheral wall of the connector body (110), and the outer side of the first elastic sealing ring (120) is used to abut against the TIP head (10).

3. The pipetting connector according to claim 2, characterized in that: The pipetting connector is provided with an annular mounting groove (112), and the annular mounting groove (112) surrounds the axis of the connector body (110). The first elastic sealing ring (120) is arranged in the annular mounting groove (112), and the inner side of the first elastic sealing ring (120) is used to abut against the inner wall of the annular mounting groove (112).

4. The pipetting connector according to claim 2, characterized in that: The pipetting connector also includes an annular rigid protrusion (130), which is arranged on the connector body (110). The annular rigid protrusion (130) surrounds the axis of the connector body (110), and the annular rigid protrusion (130) and the first elastic sealing ring (120) are spaced apart.

5. The pipetting connector according to claim 1, characterized in that: The transfer connector also includes a second elastic sealing ring, which is sleeved on the connector body (110), the first elastic sealing ring (120) and the second elastic sealing ring are spaced apart, and the second elastic sealing ring is used to elastically abut the TIP head (10).

6. A pipetting head, characterized in that: It comprises a piston cavity (200), a piston rod (300) and a pipetting connector as described in any one of claims 1 to 5, wherein the piston rod (300) can be slidably fitted in the piston cavity (200), the connector body (110) and the piston cavity (200) are connected, and the connector body (110) is provided with a through hole (111), and the through hole (111) and the piston cavity (200) are connected.

7. The pipetting head according to claim 6, characterized in that: The pipetting head further comprises at least one magnetic member (400), and the at least one magnetic member (400) is arranged in the piston cavity (200); or, the pipetting head further comprises at least one detection protrusion, and the at least one detection protrusion is arranged in the piston cavity (200).

8. The pipetting head according to claim 6, characterized in that: The pipetting head also includes a limiting member (500), which is telescopically arranged in the piston cavity (200), and the limiting member (500) is used to pass through the limiting hole when extended, or the limiting member (500) is used to disengage from the limiting hole when retracted.

9. A liquid transfer device, characterized in that: It comprises a mounting frame (2100) and the pipetting head according to claim 6 or claim 7, wherein the pipetting head is mounted on the mounting frame (2100).

10. The liquid transfer device according to claim 9, characterized in that: The mounting frame (2100) is provided with a limiting hole, and the pipetting head also includes a limiting member (500), and the limiting member (500) is telescopically arranged in the piston cavity (200), and the limiting member (500) is used to pass through the limiting hole when extended, or the limiting member (500) is used to disengage from the limiting hole when retracted.

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