Filter cup fixing mechanism of microbial limit instrument

Abstract

The filter cup fixing mechanism comprises a limit instrument body, a plurality of fixing seats and filter cups, the fixing seats are arranged at the top of the limit instrument body at intervals, each fixing seat is provided with one filter cup, a suction filtration opening is formed in the center of each fixing seat, and the filter cups are arranged in the suction filtration openings. A protruding limiting ring is arranged on the upper surface of the fixing seat, an annular groove is formed in the portion, on the outer side of the limiting ring, of the fixing seat, a filter membrane groove is formed in the portion, on the inner side of the limiting ring, of the fixing seat, a filter membrane is arranged in the filter membrane groove, an annular clamping groove is formed in the inner side of the bottom of the filter cup, and the annular clamping groove is matched with the limiting ring. According to the filter cup fixing mechanism, the limiting ring is matched with the annular groove, the filter cup is installed on the fixing base, the filter membrane is placed in the filter membrane groove, rapid installation of the filter cup can be achieved, the bottom of the filter cup cannot be subjected to tensioning force of the fixing base, and therefore the problems of deformation, cracking and the like cannot occur, the service life of the filter cup is prolonged, and the filter cup fixing mechanism is suitable for popularization and application. The use cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of microbial inspection, in particular to a filter cup fixing mechanism of a microbial limit detector. Background Art

[0002] The microbial limit detector is abbreviated as the microbial limit instrument. It uses the principle of membrane filtration method. By using a sterile filter membrane with a certain pore size to intercept microorganisms and then culturing and counting them, it is mainly used for the detection of microorganisms in water by the membrane filtration method in national standards, and is applicable to the microbial limit detection of production water, raw materials, intermediates and finished products in pharmaceutical enterprises, the bacterial inspection of water quality such as air-conditioning condensate water and domestic water by disease control, and the microbial and limit detection of environmental monitoring agencies.

[0003] The filtration component of the microbial limit instrument generally consists of structures such as gaskets, filter membranes, filter cups, screw caps and cup lids. When installing, first place the gasket and the filter membrane in turn at the liquid suction port of the diaphragm pump of the instrument, then connect the filter cup and the screw cap above the filter membrane and the gasket, and finally screw on the cup lid to seal the filter cup.

[0004] After each use of the microbial limit instrument, it is necessary to disassemble the filter cup and other filtration components for cleaning and disinfection to prevent cross-contamination. Since the existing filter cups are generally connected to the mounting seat by clamping (interference fit), the bottom of the filter cup is subjected to the tension of the mounting seat for a long time, and the filter cup is usually made of plastic. After repeated disassembly and assembly, problems such as deformation and cracking are likely to occur at the cup mouth at the bottom of the filter cup, and the filter cup needs to be replaced irregularly, resulting in a relatively high use cost.

[0005] Therefore, the existing filter cup installation and fixing methods need to be improved. Summary of the Utility Model

[0006] To solve the above technical problems, the utility model discloses a filter cup fixing mechanism of a microbial limit instrument, which includes a limit instrument body, a plurality of fixing seats and filter cups. The plurality of fixing seats are arranged at intervals on the top of the limit instrument body, and each fixing seat is provided with a filter cup. A suction filtration port is arranged at the central position of the fixing seat. A raised limit ring is arranged on the upper surface of the fixing seat. An annular groove is arranged on the fixing seat outside the limit ring. A filter membrane groove is arranged on the fixing seat inside the limit ring. A filter membrane is arranged in the filter membrane groove. An annular clamping groove is arranged on the inner side of the bottom of the filter cup, and the annular clamping groove is adapted to the limit ring.

[0007] Furthermore, a group of longitudinal notches are symmetrically arranged along the radial direction on the outer wall of the annular groove. The bottom of the longitudinal notch is connected with a transverse notch, and the longitudinal notch and the transverse notch form an L-shaped structure.

[0008] Furthermore, a set of locking blocks are symmetrically arranged on the outer wall of the bottom of the filter cup along the radial direction. The locking blocks enter the transverse notch through the longitudinal notch, thereby realizing the connection between the filter cup and the fixed seat.

[0009] Furthermore, an annular pressing ring is arranged inside the annular card slot, and the annular pressing ring presses the filter membrane tightly in the filter membrane slot.

[0010] Furthermore, a cup cover is also arranged at the opening of the top of the filter cup, and the cup cover is buckled on the filter cup.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] The filter cup fixing mechanism of the present utility model installs the filter cup on the fixed seat through the cooperation of the limiting ring and the annular groove, and places the filter membrane in the filter membrane slot, which can realize the rapid installation of the filter cup. The bottom of the filter cup will not be subjected to the tightening force of the fixed seat, so problems such as deformation and cracking will not occur, which is beneficial to extending the service life of the filter cup and reducing the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0015] Figure 2 It is an exploded view of the related structures of the filter cup and the fixed seat in the present utility model;

[0016] Figure 3 It is a schematic diagram of the structure of the fixed seat in the present utility model;

[0017] Figure 4 It is a sectional view of the structures of the filter cup and the fixed seat in the present utility model;

[0018] Figure 5 For Figure 4 The enlarged view of the partial structure at A in.

[0019] Reference numerals:

[0020] 1 - limit gauge body, 2 - fixed seat, 21 - suction filtration port, 22 - limiting ring, 23 - annular groove, 24 - filter membrane slot, 25 - filter membrane, 26 - longitudinal notch, 27 - transverse notch, 3 - filter cup, 31 - locking block, 32 - annular card slot, 33 - annular pressing ring, 4 - cup cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part rather than all of the embodiments of the present utility model.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0023] In the description of the embodiments, unless otherwise clearly specified and limited, the terms "arranged", "connected", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or connected through an intermediate medium, or the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0024] As Figure 1 shown, the filter cup fixing mechanism of the microbial limit detector in this embodiment includes a limit detector body 1, a plurality of fixing seats 2, and a filter cup 3. The plurality of fixing seats 2 are arranged at intervals on the top of the limit detector body 1, and each fixing seat 2 is provided with a filter cup 3.

[0025] Among them, the limit detector body 1 adopts well-known technologies in the art, and its structure and working principle are well-known to those skilled in the art. Moreover, this application does not involve the improvement of the limit detector body 1, so it will not be elaborated here.

[0026] As Figures 2-3 shown, a suction filtration port 21 is provided at the central position of the fixing seat 2. The suction filtration port 21 is connected to a diaphragm pump inside the limit detector body 1 for sucking the test solution in the filter cup 3.

[0027] A raised limit ring 22 is provided on the upper surface of the fixing seat 2. An annular groove 23 is provided on the fixing seat 2 outside the limit ring 22. A filter membrane groove 24 is provided on the fixing seat inside the limit ring 22. A filter membrane 25 is provided in the filter membrane groove 24. The filter cup 3 is arranged above the fixing seat 2, and a cup cover 4 is further provided at the top opening of the filter cup 3. The cup cover 4 is buckled on the filter cup 3.

[0028] A group of longitudinal notches 26 are symmetrically provided on the outer wall of the annular groove 23 along the radial direction, and a transverse notch 27 is connected to the bottom of the longitudinal notch 26, and the longitudinal notch 26 and the transverse notch 27 form an L-shaped structure. A group of locking blocks 31 are symmetrically provided on the outer wall of the bottom of the filter cup 3 along the radial direction, and the locking blocks 31 enter the transverse notch 27 through the longitudinal notch 26, and then rotate a certain angle so that the locking blocks 31 are clamped in the transverse notch 27, thereby realizing the connection between the filter cup 3 and the fixing seat 2.

[0029] like Figures 4-5 As shown, an annular groove 32 is provided on the inner side of the bottom of the filter cup 3 , and the annular groove 32 is matched with the limiting ring 22 ; an annular pressure ring 33 is provided on the inner side of the annular groove 32 , and the annular pressure ring 33 presses the filter membrane 25 tightly in the filter membrane groove 24 .

[0030] When the utility model is used, the filter membrane 25 is first placed in the filter membrane groove 24, and then the annular groove 32 at the bottom of the filter cup 3 is aligned with the limit ring 22, and the locking block 31 is aligned with the longitudinal notch 26, and the filter cup 3 is placed on the fixed seat 2, and then the filter cup 3 is rotated to make the locking block 31 enter the transverse notch 27, so that the filter cup 3 is locked on the fixed seat 2, thereby achieving the fixation of the filter cup 3.

[0031] At the same time, the annular pressure ring 33 presses the filter membrane 25 tightly into the filter membrane groove 24 , thereby fixing and sealing the edge position of the filter membrane 25 .

[0032] Since the filter cup 3 is naturally inserted into the limiting ring 22 through the annular groove 32 and is locked by the cooperation of the locking block 31 and the transverse notch 27, there is no interference fit problem between the bottom of the filter cup 3 and the edge of the fixing seat 2, that is, the bottom of the filter cup 3 will not be subject to the tension of the fixing seat 2, so there will be no deformation, cracking and other problems, which is conducive to extending the service life of the filter cup 3 and reducing the cost of use.

[0033] During the test, the test solution is first poured into the filter cup 3, and then the cup cover 4 is buckled; the diaphragm pump inside the limit meter body 1 starts to work, so that a negative pressure environment is formed in the filter cup 3, and the test solution is filtered through the filter membrane 25. Since the pores of the filter membrane 25 are smaller than the size of the microorganisms to be detected, the microorganisms are retained on the filter membrane 25, and solids smaller than the pores of the filter membrane 25 will also be separated.

[0034] The filter membrane 25 that retains the microorganisms is taken out and transferred to the solid culture medium with the bacterial surface facing upward. The culture medium is then placed in a constant temperature incubator for cultivation. After the microorganisms grow to form colonies visible to the naked eye, they are counted. The number of colonies obtained by counting can be used to analyze whether the microbial content in the test solution meets the relevant standards or regulations.

[0035] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement; when the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

Claims

1. A filter cup fixing mechanism of a microbial limit tester, characterized in that: It includes a limit gauge body, a plurality of fixing seats and filter cups. The plurality of fixing seats are arranged at intervals on the top of the limit gauge body, and each fixing seat is provided with a filter cup. A suction filtration port is provided at the central position of the fixing seat. A raised limiting ring is provided on the upper surface of the fixing seat. An annular groove is provided on the fixing seat outside the limiting ring, and a filter membrane groove is provided on the fixing seat inside the limiting ring. A filter membrane is provided in the filter membrane groove. An annular clamping groove is provided on the inner side of the bottom of the filter cup, and the annular clamping groove is adapted to the limiting ring.

2. The filter cup fixing mechanism of the microbial limit detector according to claim 1, characterized in that: A set of longitudinal notches are symmetrically arranged along the radial direction on the outer wall of the annular groove, and a transverse notch is connected to the bottom of the longitudinal notch. The longitudinal notch and the transverse notch form an L-shaped structure.

3. The filter cup fixing mechanism of the microbial limit detector according to claim 2, characterized in that: A set of locking blocks are symmetrically arranged along the radial direction on the outer wall of the bottom of the filter cup. The locking blocks enter the transverse notch through the longitudinal notch, so as to realize the connection between the filter cup and the fixing seat.

4. The filter cup fixing mechanism of the microbial limit detector according to claim 1, characterized in that: An annular pressing ring is provided inside the annular clamping groove, and the annular pressing ring presses the filter membrane tightly in the filter membrane groove.

5. The filter cup fixing mechanism of the microbial limit detector according to claim 1, characterized in that: A cup cover is further provided at the opening of the top of the filter cup, and the cup cover is buckled on the filter cup.

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