Filter for pipettor

Abstract

The utility model relates to a filter for a pipettor, which comprises a mounting pipe, a filtering part and a liquid discharge pipe, the filtering part comprises an upper cover, a lower cover and a filtering membrane, the mounting pipe is connected to the upper cover and is communicated with the interior of the upper cover, the mounting pipe is provided with a connecting assembly for connecting the mounting pipe and the pipettor, and the liquid discharge pipe is connected with the lower cover through the connecting assembly. The liquid discharging pipe is connected to the lower cover and communicated with the interior of the lower cover, the upper cover is sleeved with a connecting sleeve, the cross section of the connecting sleeve is L-shaped, internal threads are arranged on the inner wall of the connecting sleeve, external threads are arranged on the outer ring wall of the lower cover, and during assembly, the lower cover is in threaded fit in the connecting sleeve, and the lower cover is in threaded fit with the connecting sleeve. The filter membrane is installed between the upper cover and the lower cover, and a sealing belt is arranged between the connecting sleeve and the lower cover. The filter has the effect of improving the assembly stability of the filter.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a filter for a pipette. Background Art

[0002] The method of filtration and sterilization is to remove bacteria from liquid or air by physical retention to achieve the purpose of sterility. The instrument used is a bacteriological filter with tiny pore diameters. It is mainly used for the sterilization of heat-sensitive biological products such as serum, toxins, and antibiotics, as well as air. Commonly used bacteriological filters include membrane bacteriological filters.

[0003] Chinese Patent with the publication number CN208193847U discloses a needle filter, which includes an upper cover, and a lower cover arranged at the lower end of the upper cover and connected to the upper cover. The lower cover includes a lower cover body and a lower cover water outlet pipe, and the upper cover includes an upper cover body and an upper cover water inlet pipe. An outlet device is arranged inside the upper cover. The outlet device includes a bottom plate, and water outlet pipes communicated with the bottom plate are arranged around the bottom plate. The water outlet pipes are distributed in a ring shape. A wrapping block is arranged on the surface at the connection of the upper cover and the lower cover. This needle filter not only reduces the problem that impurities on the separation membrane are prone to accumulate too concentratedly, but also improves the stability of the connection of the round cover.

[0004] In view of the above related technologies, in the prior art, the staff realizes the connection between the upper cover body and the lower cover body through the wrapping block. However, the wrapping block is clamped and connected between the upper cover body and the lower cover body, but there is no other means to limit the movement of the wrapping block on the wrapping block. Only the friction force is used to limit the wrapping block, and there is a possibility that the wrapping block disengages from the upper cover body or the lower cover body, resulting in the separation of the upper cover body and the lower cover body and the failure of the filter. Content of the Utility Model

[0005] In order to improve the assembly stability of the filter, the present application provides a filter for a pipette.

[0006] The filter for a pipette provided by the present application adopts the following technical solution:

[0007] A filter for a pipette includes an installation pipe, a filtering part, and a liquid discharge pipe. The filtering part includes an upper cover, a lower cover, and a filtering membrane. The installation pipe is connected to the upper cover and communicates with the inside of the upper cover. A connection component for connecting the installation pipe to the pipette is arranged on the installation pipe. The liquid discharge pipe is connected to the lower cover and communicates with the inside of the lower cover. A connection sleeve is sleeved on the upper cover. The cross-section of the connection sleeve is in an L shape. Internal threads are arranged on the inner wall of the connection sleeve. External threads are arranged on the outer circumferential wall of the lower cover. During assembly, the lower cover is in threaded cooperation with the connection sleeve and abuts against the upper cover. The filtering membrane is installed between the upper cover and the lower cover. A sealing tape is arranged between the connection sleeve and the lower cover.

[0008] By adopting the above technical solutions, during assembly, the staff installs the filter membrane between the upper cover and the lower cover, sleevs the connecting sleeve on the upper cover, then rotates the lower cover so that the lower cover is threadedly engaged in the connecting sleeve to install the lower cover. Finally, the installation pipe is connected to the liquid suction port of the pipette by using the connecting component, realizing the installation of the filter. The staff uses the connecting sleeve to connect the upper cover and the lower cover. Finally, by setting the sealing tape, on the one hand, the installation of the lower cover is made more firm and tight, and on the other hand, the sealing performance between the lower cover and the connecting sleeve is improved. Compared with the prior art, the assembly stability of the filter is improved.

[0009] Optionally, a convex ring is connected to the upper cover, and a groove matching the outer shape of the convex ring is formed at a position corresponding to the convex ring on the lower cover. During assembly, the convex ring is inserted and engaged in the groove.

[0010] By adopting the above technical solutions, the staff forms a diversion channel between the upper cover and the lower cover through the cooperation between the convex ring and the groove, reducing the possibility of liquid leakage between the upper cover and the lower cover and improving the sealing performance between the upper cover and the lower cover.

[0011] Optionally, a plurality of connecting rib strips are arranged between the lower cover and the drain pipe.

[0012] By adopting the above technical solutions, the connecting rib strips are used to strengthen the structural strength between the drain pipe and the lower cover on the one hand and to facilitate the staff to rotate the lower cover on the other hand, improving the assembly convenience of the filter.

[0013] Optionally, the connecting component includes a connecting outer cylinder, the connecting outer cylinder is connected to the upper cover, a connecting thread is arranged on the inner wall of the connecting outer cylinder, the installation pipe is located inside the connecting outer cylinder. During connection, the liquid suction port of the pipette is located between the installation pipe and the connecting outer cylinder and is threadedly engaged with the connecting outer cylinder.

[0014] By adopting the above technical solutions, when connecting the filter, the staff threadedly engages the liquid suction port of the pipette between the outer cylinder and the installation pipe, and restricts the filter through the friction force of the thread, realizing the installation of the filter.

[0015] Optionally, anti-slip lines are arranged on the outer ring wall of the connecting sleeve.

[0016] By adopting the above technical solutions, the anti-slip lines are used to increase the friction force of the connecting sleeve, making it more convenient for the staff to rotate the filter.

[0017] Optionally, the connection component includes an expansion ring, a tightening hoop, and a tightening bolt. The expansion ring is connected to the installation pipe and is coaxially arranged with the installation pipe. A plurality of deformation grooves are formed in the expansion ring, and a limiting groove is formed in the outer ring wall of the expansion ring. The tightening hoop is sleeved in the limiting groove, and the tightening bolt passes through one end of the tightening hoop and is threadedly engaged with the other end of the tightening hoop. During connection, the liquid suction port of the pipette is located inside the installation pipe.

[0018] By adopting the above technical solution, when connecting the filter, the staff inserts the liquid suction port of the pipette into the installation pipe, and then rotates the tightening bolt to tighten the tightening hoop and apply pressure to the expansion ring. The expansion ring squeezes the liquid suction port of the pipette, thereby restricting the filter and realizing the installation of the filter.

[0019] Optionally, the connection component includes a first fixing ring, a second fixing ring, an elastic band, a connection ring, and a rubber sleeve. The first fixing ring is connected to the installation pipe, the second fixing ring is connected to the liquid suction port of the pipette, the connection ring is sleeved on the installation pipe, and the rubber sleeve is connected between the elastic band and the connection ring. During connection, the elastic band is sleeved at the liquid suction port of the pipette, and both the first fixing ring and the second fixing ring are located between the elastic band and the connection ring.

[0020] By adopting the above technical solution, when connecting the filter, the staff inserts the liquid suction port of the pipette into the installation pipe, then moves the elastic band and sleeves the elastic band on the second fixing ring. Through the action of the rubber sleeve, the liquid suction port of the pipette is restricted inside the installation pipe, realizing the connection of the filter.

[0021] Optionally, a retaining ring is connected to the inner ring wall of the installation pipe. During connection, the liquid suction port of the pipette abuts against the retaining ring.

[0022] By adopting the above technical solution, the position of the liquid suction port of the pipette inside the installation pipe cannot be too deep or too shallow, otherwise it is not easy for the elastic band and the rubber sleeve to restrict the liquid suction port of the pipette. The retaining ring is used to position the liquid suction port of the pipette inside the installation pipe, making it easier for the rubber sleeve to stretch and the liquid suction port of the pipette to be restricted.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. During assembly, the staff installs the filter membrane between the upper cover and the lower cover, sleevs the connecting sleeve on the upper cover, then rotates the lower cover so that the lower cover is threadedly engaged in the connecting sleeve to install the lower cover. Finally, the installation tube is connected to the liquid suction port of the pipette by using the connecting component, thus realizing the installation of the filter. The staff uses the connecting sleeve to connect the upper cover and the lower cover. Finally, by setting the sealing tape, on the one hand, the installation of the lower cover is made more firm and tight, and on the other hand, the sealing performance between the lower cover and the connecting sleeve is improved. Compared with the prior art, the assembly stability of the filter is improved;

[0025] 2. When connecting the filter, the staff inserts the liquid suction port of the pipette into the installation tube, then rotates the tightening bolt so that the tightening hoop tightens and presses on the expansion ring, and the expansion ring presses on the liquid suction port of the pipette, thereby restricting the filter and realizing the installation of the filter;

[0026] 3. When connecting the filter, the staff inserts the liquid suction port of the pipette into the installation tube, then moves the telescopic belt and sleevs the telescopic belt on the second fixing ring. Through the acting force of the rubber sleeve, the liquid suction port of the pipette is restricted in the installation tube, realizing the connection of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the filter in Embodiment 1 of the present application.

[0028] Figure 2 is a cross-sectional view showing the structure of the filter in Embodiment 1 of the present application.

[0029] Figure 3 is a schematic diagram of the structure of the connecting component in Embodiment 2 of the present application.

[0030] Figure 4 is an exploded view showing the structure of the connecting component in Embodiment 2 of the present application.

[0031] Figure 5 is a connection state diagram of the filter in Embodiment 2 of the present application.

[0032] Figure 6 is an exploded view showing the structure of the connecting component in Embodiment 3 of the present application.

[0033] Figure 7 is a cross-sectional view showing the structure of the connecting component in Embodiment 3 of the present application.

[0034] Description of reference numerals: 01, pipette; 1, mounting tube; 11, retaining ring; 2, filtering part; 21, upper cover; 211, convex ring; 22, lower cover; 23, filter membrane; 3, drain pipe; 4, connecting rib; 5, connecting sleeve; 51, anti-slip pattern; 6, connecting component; 61, connecting outer cylinder; 62, expansion ring; 63, tightening hoop; 64, tightening bolt; 65, first fixing ring; 66, second fixing ring; 67, telescopic band; 68, connecting ring; 69, rubber sleeve. Detailed implementation mode

[0035] The following is a further detailed description of the present application in conjunction with the attached Figures 1 - 7 drawings.

[0036] Embodiment 1 of the present application discloses a filter for a pipette. Refer to Figure 1 and Figure 2 , the filter for the pipette includes a mounting tube 1, a filtering part 2 and a drain pipe 3. The filtering part 2 includes an upper cover 21, a lower cover 22 and a filter membrane 23. The mounting tube 1 is fixedly connected to the upper cover 21, and the drain pipe 3 is fixedly connected to the lower cover 22. A plurality of connecting ribs 4 are fixedly connected between the lower cover 22 and the drain pipe 3, and the connecting ribs 4 are used to increase the connection strength between the lower cover 22 and the drain pipe 3. Placement steps are installed between the upper cover 21 and the lower cover 22, and the filter membrane 23 is placed between the two placement steps. Both the mounting tube 1 and the drain pipe 3 communicate with the area between the upper cover 21 and the lower cover 22.

[0037] Refer to Figure 2 , a connecting sleeve 5 is sleeved on the upper cover 21. The cross-section of the connecting sleeve 5 is L-shaped. A plurality of abutting convex strips are provided on one side wall of the connecting sleeve 5, and abutting grooves are provided at the positions corresponding to the abutting convex strips on the upper cover 21. When the upper cover 21 is located inside the connecting sleeve 5, the abutting convex strips are located inside the abutting grooves. Internal threads are provided on the inner ring wall of the connecting sleeve 5, and the lower cover 22 is in threaded fit inside the connecting sleeve 5 and abuts against the upper cover 21. A sealing band is wound around the outer ring wall of the lower cover 22, and the sealing band is provided between the connecting sleeve 5 and the lower cover 22.

[0038] Refer to Figure 2 , in order to improve the sealing performance between the upper cover 21 and the lower cover 22, a convex ring 211 is fixedly connected to the upper cover 21, and a groove is opened at the position corresponding to the convex ring 211 on the lower cover 22. The convex ring 211 is in plug-in fit with the groove. A diversion channel is formed between the convex ring 211 and the groove, thereby reducing the possibility of liquid leakage between the upper cover 21 and the lower cover 22.

[0039] Refer to Figure 2, a connection component 6 is provided on the installation pipe 1. The connection component 6 includes a connection outer cylinder 61 which is fixedly connected to the upper cover 21. The installation pipe 1 is located inside the connection outer cylinder 61 and is coaxially arranged with the connection outer cylinder 61. A connection thread is provided on the inner ring wall of the connection outer cylinder 61. Anti-slip lines 51 are provided on the outer ring wall of the connection sleeve 5, and the anti-slip lines 51 are used to assist in rotating the filter.

[0040] When connecting the filter, the staff threadedly mates the liquid suction port of the pipette 01 between the installation pipe 1 and the connection outer sleeve, and restricts the liquid suction port of the pipette 01 by the frictional force of the thread, thus realizing the installation of the filter.

[0041] The implementation principle of the filter for the pipette in Embodiment 1 of the present application is as follows: during assembly, the staff places the filter membrane 23 between two placement steps, then sleevs the connection sleeve 5 on the upper cover 21, and rotates the lower cover 22 to threadedly mate the lower cover 22 inside the connection sleeve 5 and press against the upper cover 21. Finally, threadedly mate the connection outer cylinder 61 on the liquid suction port of the pipette 01, thus realizing the installation of the filter.

[0042] The staff uses the connection sleeve 5 to realize the connection between the upper cover 21 and the lower cover 22. Finally, by setting a sealing tape, on the one hand, the installation of the lower cover 22 is made more firm and tight, and on the other hand, the sealing performance between the lower cover 22 and the connection sleeve 5 is improved. Compared with the prior art, the assembly stability of the filter is improved.

[0043] Embodiment 2: The difference between this embodiment and Embodiment 1 lies in the different structure of the connection component 6.

[0044] Refer to Figure 3 、 Figure 4 and Figure 5 , the connection component 6 includes an expansion ring 62, a tightening hoop 63 and a tightening bolt 64. The expansion ring 62 is fixedly connected to the installation pipe 1 and is coaxially arranged with the installation pipe 1. A number of deformation grooves are provided on the expansion ring 62, and the number of deformation grooves is circumferentially and uniformly distributed around the axis of the expansion ring 62. A limiting groove is provided on the outer ring wall of the expansion ring 62. The tightening hoop 63 is sleeved in the limiting groove, and the tightening bolt 64 passes through one end of the tightening hoop 63 and is threadedly mated with the other end.

[0045] When connecting, the staff inserts the liquid suction port of the pipette 01 into the installation pipe 1, then rotates the tightening bolt 64 to deform the tightening hoop 63 and apply pressure to the expansion ring 62, so that the expansion ring 62 deforms and applies pressure to the liquid suction port of the pipette 01, thereby restricting the filter and realizing the installation of the filter.

[0046] Embodiment 3: The difference between this embodiment and Embodiment 1 lies in the different structure of the connection component 6.

[0047] Refer to Figure 6 and Figure 7, the connecting component 6 includes a first fixing ring 65, a second fixing ring 66, an elastic belt 67, a connecting ring 68 and a rubber sleeve 69. The first fixing ring 65 is fixedly connected to the installation pipe 1, and the second fixing ring 66 is fixedly connected to the liquid suction port of the pipette 01. The connecting ring 68 is fixedly connected between the first fixing ring 65 and the installation pipe 1, and the rubber sleeve 69 is fixedly connected between the elastic belt 67 and the connecting ring 68. A retaining ring 11 is fixedly connected to the inner wall of the installation pipe 1, and the retaining ring 11 is used to limit the position of the liquid suction port of the pipette 01 in the installation pipe 1.

[0048] During connection, the staff inserts the liquid suction port of the pipette 01 into the installation pipe 1 and abuts against the retaining ring 11, sleeved the elastic belt 67 on the second fixing ring 66, and restricted the installation pipe 1 through the deformation force of the rubber sleeve 69 and the elastic belt 67, realizing the installation of the filter.

[0049] The above are all the preferred embodiments of this application. It does not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A filter for a pipette, characterized in that: It includes an installation pipe (1), a filtering part (2) and a liquid discharge pipe (3). The filtering part (2) includes an upper cover (21), a lower cover (22) and a filtering membrane (23). The installation pipe (1) is connected to the upper cover (21) and communicates with the inside of the upper cover (21). A connection assembly (6) for connecting the installation pipe (1) and a pipette (01) is provided on the installation pipe (1). The liquid discharge pipe (3) is connected to the lower cover (22) and communicates with the inside of the lower cover (22). A connection sleeve (5) is sleeved on the upper cover (21). The cross-section of the connection sleeve (5) is L-shaped. Internal threads are provided on the inner wall of the connection sleeve (5). External threads are provided on the outer ring wall of the lower cover (22). During assembly, the lower cover (22) is in threaded fit within the connection sleeve (5) and abuts against the upper cover (21). The filtering membrane (23) is installed between the upper cover (21) and the lower cover (22). A sealing tape is provided between the connection sleeve (5) and the lower cover (22).

2. The filter for a pipette according to claim 1, characterized in that: A convex ring (211) is connected to the upper cover (21). A groove matching the outer shape of the convex ring (211) is formed at a position corresponding to the convex ring (211) on the lower cover (22). During assembly, the convex ring (211) is inserted and fitted within the groove.

3. The filter for a pipette according to claim 1, wherein: A number of connecting rib strips (4) are provided between the lower cover (22) and the liquid discharge pipe (3).

4. The filter for a pipette according to claim 1, characterized in that: The connection assembly (6) includes a connection outer cylinder (61). The connection outer cylinder (61) is connected to the upper cover (21). Connection threads are provided on the inner wall of the connection outer cylinder (61). The installation pipe (1) is located within the connection outer cylinder (61). During connection, the liquid suction port of the pipette (01) is located between the installation pipe (1) and the connection outer cylinder (61) and is in threaded fit with the connection outer cylinder (61).

5. The filter for a pipette according to claim 4, characterized in that: Anti-slip lines (51) are provided on the outer ring wall of the connection sleeve (5).

6. The filter for a pipette according to claim 1, characterized in that: The connection assembly (6) includes an expansion ring (62), a tightening hoop (63) and a tightening bolt (64). The expansion ring (62) is connected to the installation pipe (1) and is coaxially arranged with the installation pipe (1). A number of deformation grooves are formed on the expansion ring (62). A limiting groove is formed on the outer ring wall of the expansion ring (62). The tightening hoop (63) is sleeved within the limiting groove. The tightening bolt (64) passes through one end of the tightening hoop (63) and is in threaded fit with the other end of the tightening hoop (63). During connection, the liquid suction port of the pipette (01) is located within the installation pipe (1).

7. The filter for a pipette according to claim 1, characterized in that: The connecting component (6) includes a first fixing ring (65), a second fixing ring (66), a telescopic belt (67), a connecting ring (68) and a rubber sleeve (69). The first fixing ring (65) is connected to the installation pipe (1), the second fixing ring (66) is connected to the liquid suction port of the pipette (01), the connecting ring (68) is sleeved on the installation pipe (1), and the rubber sleeve (69) is connected between the telescopic belt (67) and the connecting ring (68). During connection, the telescopic belt (67) is sleeved at the liquid suction port of the pipette (01), and both the first fixing ring (65) and the second fixing ring (66) are located between the telescopic belt (67) and the connecting ring (68).

8. The filter for a pipette according to claim 7, characterized in that: A retaining ring (11) is connected to the inner wall of the installation pipe (1). During connection, the liquid suction port of the pipette (01) abuts against the retaining ring (11).

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