A pipette for chemical experiments

Abstract

The utility model relates to experimental equipment technical field, and disclose a pipette for chemical experiment, including casing and set up in the liquid suction part of casing, the bottom of liquid suction part is equipped with the liquid outlet pipe for installing the suction head, still include suction head ejection mechanism, suction head ejection mechanism include: drive assembly, can be up and down mobile and set up on the casing, the member of springiness is connected with drive assembly transmission, and is set up in the liquid outlet pipe periphery, the member of springiness is driven to move downward under drive assembly, to exert force to the suction head and make it fall off from the liquid outlet pipe, drive assembly still include height adjusting mechanism, for adjusting the initial installation height of drive assembly on the casing, the utility model discloses the drive assembly design of adjustable height, effectively promoted the adaptability of pipette use, makes the user of different hand type all can with the most comfortable posture carry out the operation of the suction head, reduced the fatigue feeling of long time use, improved the experiment efficiency.

Description

Technical Field

[0001] This utility model relates to the field of experimental equipment technology, specifically a pipette for chemical experiments. Background Technology

[0002] Pipettes are indispensable precision instruments in laboratories of chemistry, biology, and medicine, used for the accurate measurement and transfer of minute amounts of liquid. A traditional pipette typically consists of a housing, an internal aspiration mechanism, and a tip attachment rod at the bottom. The aspiration mechanism uses the movement of a piston to generate pressure changes, thereby achieving the aspiration and dispensing of liquid. Disposable plastic tips are tightly fitted to the tip attachment rod with an interference fit to prevent air leakage or detachment during pipetting.

[0003] Most pipettes on the market integrate a mechanical tip ejection mechanism. This type of mechanism typically has a button or pusher; when pressed, the tip is pushed down via a pusher or collar that fits over the tip connector. However, existing ejection mechanisms still have some common drawbacks: First, the position and travel of the operating lever (button) are fixed and cannot be adjusted according to different users' hand size, finger length, or operating habits. Users with smaller hands may need to extend their thumbs significantly to press it, while users with larger hands may feel cramped, and prolonged, high-frequency operation can easily lead to hand fatigue or even discomfort, resulting in poor ergonomics. Second, the guide structure of some ejection mechanisms is simply designed, and after long-term use, it is prone to wear and tear, causing wobbling or jamming, affecting the smoothness and reliability of operation.

[0004] Therefore, there is an urgent need in this field for a new type of pipette whose ejection mechanism can not only efficiently and effortlessly eject the pipette tip, but also provide user-friendly adjustable functions to suit different user groups, while having a more stable and durable mechanical structure, thereby improving the overall operating experience and safety performance. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This invention relates to a pipette for chemical experiments, comprising a housing and a suction section disposed within the housing, wherein the bottom end of the suction section is provided with a discharge tube for mounting a pipette tip. It also includes a suction head ejection mechanism, which includes: A drive assembly is movably mounted on the housing. The ejector is connected to the drive assembly and is sleeved around the liquid outlet tube; the ejector moves downward under the drive of the drive assembly to apply force to the suction head and cause it to fall off the liquid outlet tube. The reset elastic element acts on the drive assembly and / or the ejector element to provide an upward reset force; The drive assembly also includes a height adjustment mechanism for adjusting the initial installation height of the drive assembly on the housing.

[0006] Furthermore, a vertical channel is provided on the housing, and the driving assembly includes a suction head ejection mechanism that can be slidably disposed in the channel via a guide structure, and the ejector is connected to the bottom of the suction head ejection mechanism.

[0007] Furthermore, the guide structure includes at least one vertical groove formed in the inner wall of the channel, and a protrusion disposed on the suction head ejection mechanism and cooperating with the groove.

[0008] Furthermore, the protrusion is a ball connected to the side of the suction head ejection mechanism via a connecting rod.

[0009] Furthermore, the height adjustment mechanism includes a vertical rod and an adjusting nut; the top of the suction head ejection mechanism is provided with a screw hole, and the bottom end of the vertical rod is threaded into the screw hole; the adjusting nut is threaded onto the vertical rod and is located above the suction head ejection mechanism, and the depth of the vertical rod extending into the screw hole can be changed by screwing the adjusting nut.

[0010] Furthermore, the channel includes a deep groove and a stepped hole that are connected sequentially from top to bottom; the suction head ejection mechanism includes a slider located in the deep groove and a transmission part extending downward from the bottom of the slider and passing through the stepped hole; the reset elastic element is a spring sleeved on the transmission part, with its two ends acting on the stepped surface of the stepped hole and the transmission part or the slider, respectively.

[0011] Furthermore, the transmission part includes a protrusion connected to the bottom surface of the slider and a guide rod connected to the protrusion. The ejector is an extension rod connected to the bottom end of the guide rod, and the extension rod is provided with a through groove through which the liquid supply pipe passes.

[0012] Furthermore, the cross-section of the protruding post is elliptical, and the upper end of the stepped hole is provided with an elliptical hole that matches the shape of the protruding post, in order to prevent the suction head ejection mechanism from rotating.

[0013] Furthermore, a groove is provided on the end face of the housing, and a detachable pressure block is installed in the groove. The pressure block extends into the channel to limit the upward movement of the drive component.

[0014] Furthermore, the liquid suction part is housed within the cavity of the housing, and the cavity and the channel of the suction head ejection mechanism are independent of each other and arranged in parallel.

[0015] This utility model has the following beneficial effects: This invention, through the design of an adjustable height drive component, effectively improves the adaptability of pipettes, allowing users with different hand shapes to perform pipette tip withdrawal operations in the most comfortable posture, reducing fatigue during prolonged use and improving experimental efficiency.

[0016] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall design of this utility model; Figure 2 This is a cross-sectional view of the shell of this utility model; Figure 3 This utility model Figure 2 A schematic diagram of the decomposition process; Figure 4 This is a schematic diagram of the housing of this utility model; Figure 5 This is a schematic diagram of the pressing block of this utility model; Figure 6 This is a schematic diagram of the structure of this utility model; The attached diagram lists the components represented by each number as follows: In the diagram: 1. Shell; 101. Deep groove; 102. Stepped hole; 103. Tank body; 104. Slide groove; 105. Cavity; 2. Suction part; 201. Discharge pipe; 3. Pressure block; 301. Protrusion; 4. Suction head ejection mechanism; 401. Slider; 402. Protrusion; 403. Guide rod; 404. Ejector; 4041. Through groove; 405. Vertical rod; 406. Adjusting nut; 407. Ball; 408. Connecting rod; 5. Reset elastic element; 6. Suction head. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figures 1 to 6As shown, this utility model provides a pipette for chemical experiments, the main improvement of which lies in the user-friendly design and adjustability of the pipette tip ejection mechanism.

[0021] The pipette includes a housing 1, a suction section 2, a pressure block 3, a tip ejection mechanism 4, a spring 5, and a tip 6. The housing 1 serves as the main structure, with an internal cavity 105 for accommodating the suction section 2. The suction section 2 is the core functional component of the pipette, with a dispensing tube 201 at its bottom for mounting disposable tips 6. The suction section 2 can be a conventional air-cushion piston structure or an external piston structure; this is existing technology and will not be described further here.

[0022] The focus of this embodiment is on the suction head ejection mechanism. A vertical channel parallel to the cavity 105 is provided on the housing 1. Specifically, this channel includes a deep groove 101 and a stepped hole 102 connected sequentially from top to bottom. Two vertical sliding grooves 104 are symmetrically formed on the inner wall of the deep groove 101.

[0023] The suction head ejection mechanism 4, as a driving component, is vertically movable within the vertical channel. The suction head ejection mechanism 4 includes a slider 401, a protrusion 402, a guide rod 403, and an extension rod 404. The slider 401 is located inside the deep groove 101, and its outer surface is symmetrically provided with two sets of balls 407. Each ball 407 is connected to the slider 401 via a connecting rod 408. The balls 407 are embedded in corresponding grooves 104, thus forming an efficient guiding structure that ensures the suction head ejection mechanism 4 can only move smoothly in the vertical direction without rotation or deviation.

[0024] By embedding the ball 407 into the corresponding groove 104, the contact area between the ball 407 and the groove 104 is reduced, thereby reducing the resistance generated during the sliding process.

[0025] A protruding post 402 is provided at the center of the bottom surface of the slider 401, and a guide rod 403 is connected to the bottom of the protruding post 402. The protruding post 402 and the guide rod 403 extend downward and are located inside the stepped hole 102. Preferably, the cross-section of the protruding post 402 is elliptical, and the upper end of the stepped hole 102 is also correspondingly set as an elliptical hole to match it. Through this shape matching, the suction head ejection mechanism 4 can be further prevented from rotating during movement, thereby enhancing the stability of the structure.

[0026] The extension rod 404, acting as a ejector, is connected to the bottom end of the guide rod 403. A through groove 4041 is provided on the extension rod 404, which is fitted around the outlet pipe 201 of the suction section 2. When the suction head ejection mechanism 4 moves downward, the extension rod 404 also moves downward, and its bottom surface presses against the shoulder of the suction head 6 mounted on the outlet pipe 201, thereby pushing the suction head 6 off.

[0027] Spring 5, acting as a reset elastic element, is sleeved on guide rod 403. Its top end acts on the stepped surface of stepped hole 102, and its bottom end acts on the shoulder of extension rod 404 or guide rod 403. When suction head ejection mechanism 4 is pressed down, spring 5 is compressed; when the external force is released, the restoring force of spring 5 will push suction head ejection mechanism 4 to reset upward.

[0028] To accommodate different users' operating habits and hand sizes, this invention features a height adjustment mechanism. This mechanism includes a vertical rod 405 and an adjusting nut 406. A threaded hole is located at the center of the top of the slider 401. The bottom end of the vertical rod 405 is threaded into this threaded hole. The adjusting nut 406 is threaded onto the vertical rod 405 and positioned above the slider 401. By tightening the adjusting nut 406, the depth to which the vertical rod 405 is screwed into the threaded hole of the slider 401 can be changed, thereby adjusting the initial installation height of the suction head ejection mechanism 4 within the housing channel. A greater screw-in depth results in a lower initial position for the vertical rod 405 and the suction head ejection mechanism 4; conversely, a shallower screw-in depth results in a higher initial position. After adjusting to the appropriate height, tightening the adjusting nut 406 presses it against the top surface of the slider 401 to lock the position.

[0029] In addition, a groove 103 is provided on the end face of the housing 1, and a detachable pressure block 3 is installed in the groove 103. A protrusion 301 is provided on one side of the pressure block 3. The protrusion 301 extends into the upper part of the deep groove 101, which constitutes a mechanical limit for the upward movement of the slider 401, preventing it from excessively popping out of the channel due to the action of the spring 5.

[0030] Working principle: Tip ejection operation: The user presses the top of the upright rod 405 with his hand, driving the entire tip ejection mechanism 4 to move downward against the elastic force of the spring 5. The extension rod 404 connected to the bottom of the tip ejection mechanism 4 moves downward accordingly and presses the shoulder of the tip 6, thereby smoothly and effortlessly ejecting the tip 6 from the liquid outlet tube 201.

[0031] Reset: After releasing the hand, under the restoring force of the spring 5, the suction head ejection mechanism 4 drives the extension rod 404 to move upward until the top surface of the slider 401 is limited by the protrusion 301 of the pressure block 3, and returns to the initial standby state.

[0032] Height adjustment: If the user feels that the initial height of the upright 405 is not suitable, simply loosen the adjusting nut 406, then rotate the upright 405 to adjust its extension length, and then tighten the adjusting nut 406 to lock it in place.

[0033] This invention, through the design of an adjustable height drive component, effectively improves the adaptability of pipettes, allowing users with different hand shapes to perform pipette tip withdrawal operations in the most comfortable posture, reducing fatigue during prolonged use and improving experimental efficiency.

[0034] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A pipette for chemical experiments, comprising a housing (1) and a suction section (2) disposed within the housing (1), wherein the bottom end of the suction section (2) is provided with an outlet tube (201) for mounting a pipette tip (6), characterized in that: It also includes a suction head ejection mechanism (4), which includes: A drive assembly is movably mounted on the housing (1); The ejector (404) is connected to the drive assembly and is sleeved around the liquid outlet pipe (201); the ejector (404) moves downward under the drive of the drive assembly to apply force to the suction head (6) so that it falls off the liquid outlet pipe (201); The reset elastic element (5) acts on the drive assembly and / or the ejector element (404) to provide an upward reset force; The drive assembly also includes a height adjustment mechanism for adjusting the initial installation height of the drive assembly on the housing (1).

2. The pipette for chemical experiments according to claim 1, characterized in that, The housing (1) has a vertical channel, and the drive assembly includes a suction head ejection mechanism (4) that can be slidably disposed in the channel via a guide structure. The ejection element (404) is connected to the bottom of the suction head ejection mechanism (4).

3. A pipette for chemical experiments according to claim 2, characterized in that, The guide structure includes at least one vertical groove (104) formed in the inner wall of the channel, and a protrusion provided on the suction head ejection mechanism (4) and cooperating with the groove (104).

4. A pipette for chemical experiments according to claim 3, characterized in that, The protrusion is a ball (407) connected to the side of the suction head ejection mechanism (4) via a connecting rod (408).

5. A pipette for chemical experiments according to claim 2, characterized in that, The height adjustment mechanism includes a vertical rod (405) and an adjusting nut (406); the top of the suction head ejection mechanism (4) is provided with a screw hole, and the bottom end of the vertical rod (405) is threaded into the screw hole; the adjusting nut (406) is threaded onto the vertical rod (405) and is located above the suction head ejection mechanism (4), and the depth of the vertical rod (405) extending into the screw hole can be changed by turning the adjusting nut (406).

6. A pipette for chemical experiments according to claim 2, characterized in that, The channel includes a deep groove (101) and a stepped hole (102) connected sequentially from top to bottom; the suction head ejection mechanism (4) includes a slider (401) located in the deep groove (101) and a transmission part extending downward from the bottom of the slider (401) and passing through the stepped hole (102); the reset elastic element (5) is a spring sleeved on the transmission part, and its two ends act on the stepped surface of the stepped hole (102) and the transmission part or the slider (401) respectively.

7. A pipette for chemical experiments according to claim 6, characterized in that, The transmission part includes a protrusion (402) connected to the bottom surface of the slider (401) and a guide rod (403) connected to the protrusion (402). The ejector (404) is an extension rod connected to the bottom end of the guide rod (403). The extension rod is provided with a through groove (4041) through which the liquid supply pipe (201) passes.

8. A pipette for chemical experiments according to claim 7, characterized in that, The cross-section of the protruding post (402) is elliptical, and the upper end of the stepped hole (102) is provided with an elliptical hole that matches the shape of the protruding post (402) to prevent the suction head ejection mechanism (4) from rotating.

9. A pipette for chemical experiments according to claim 2, characterized in that, The end face of the housing (1) is also provided with a groove (103), and a detachable pressure block (3) is installed in the groove (103). The pressure block (3) extends into the channel to limit the upward movement of the drive component.

10. A pipette for chemical experiments according to claim 1, characterized in that, The liquid suction part (2) is housed in the cavity (105) of the housing (1), and the cavity (105) and the channel of the suction head ejection mechanism are independent of each other and arranged in parallel.

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