CN204767797U - Have pre -flock and smart vacuum filter of function that strains concurrently - Google Patents

Abstract

The utility model discloses a vacuum filter with the functions of pre-filtration and fine filtration, which comprises an upper cup for containing filtrate and a filter head installed at the bottom of the upper cup for filtering; the filter head includes a filter part and connecting head; the filtered part includes a filter cavity and a liquid outlet at the bottom of the filter cavity, the filter cavity communicates with the bottom of the upper cup, and the filter cavity is sequentially provided with a first filter membrane and a second filter membrane from top to bottom filter membrane, there is a gap between the first filter membrane and the second filter membrane; the connecting head includes an outer casing extending downward from the periphery of the filter part and a liquid outlet pipe extending downward from the liquid outlet, and the outer casing and An air pressure chamber communicating with the liquid outlet pipe and the filter cavity is formed between the liquid outlet pipes; the side wall of the outer sleeve is provided with a nozzle connected to the air pressure chamber and used for connecting with an external suction filter device. The vacuum filter with the functions of prefiltration and fine filtration described in the utility model can realize prefiltration and fine filtration in one step, has high filtration efficiency, and can be used for aseptic filtration of fluid solutions such as chemicals, medicines, and tissue culture fluids. .

Description

A vacuum filter with functions of pre-filter and fine filter

technical field

The utility model relates to a filter device for laboratory fluid solutions, in particular to a vacuum filter with functions of pre-filter and fine filter.

Background technique

During the sterile filtration of chemicals, pharmaceuticals, tissue culture fluids, and other laboratory fluid solutions, filtration processes are usually used to remove impurities or remove adherent cells. The traditional filtration method is to directly use cell filter sieves for manual operation. Careless operation of this filtration method will lead to contamination of the cells. Not only that, it is difficult to aseptically collect the filtered cells.

In order to solve the problem of aseptic collection of filtrate during filtration, a vacuum filter is used for filtration instead of traditional mesh filtration. However, when the existing fluid solution vacuum filtration device is filtering, the surface tension of the filtrate causes the filtrate to easily block the pores of the filter membrane, resulting in poor filtration of the fluid body; Filtration efficiency is low, time-consuming and labor-intensive.

Utility model content

In order to overcome the deficiencies of the prior art, the purpose of this utility model is to provide a vacuum filter with both pre-filtration and fine filtration functions, which can realize pre-filtration and fine filtration in one step and improve filtration efficiency.

In order to solve the above problems, the technical scheme adopted in the utility model is as follows:

A vacuum filter with both pre-filtration and fine-filtration functions, including an upper cup for containing filtrate and a filter head installed at the bottom of the upper cup for filtering; the filter head includes a filter part and a connecting head; The filtering part includes a filter cavity and a liquid outlet located at the bottom of the filter cavity. The filter cavity communicates with the bottom of the upper cup. A first filter membrane and a second filter membrane are sequentially arranged in the filter cavity from top to bottom. There is a gap between the filter membrane and the second filter membrane; the connection head includes an outer casing extending downward from the periphery of the filter part and a liquid outlet pipe extending downward from the liquid outlet, between the outer casing and the liquid outlet An air pressure chamber communicating with the liquid outlet pipe and the filter chamber is formed; the side wall of the outer casing is provided with a nozzle which communicates with the air pressure chamber and is used for connecting with an external suction filter device.

Further, the outer circumference of the bottom of the upper cup described in the utility model is provided with an annular groove, and the outer peripheral wall of the filter cavity is provided with an annular protrusion matching the annular groove, and the upper cup and the filter head pass through the annular protrusion The interference fit with the annular groove is interlocked with each other.

Further, the mouth of the upper cup described in the present invention is provided with a lid, and the lid is fastened to the mouth of the upper cup.

Further, the vacuum filter with both pre-filtration and fine filtration functions described in the present invention also includes a collection bottle for collecting filtrate, the collection bottle includes a bottle body and a bottle mouth arranged on the bottle body, the lower part of the connecting head A connecting pipe for connecting the bottle mouth is extended from the outer sleeve.

Further, the inner diameter of the connecting pipe of the present invention matches the outer diameter of the bottle mouth, and the connecting pipe is sleeved on the outside of the bottle mouth.

Further, in the vacuum filter described in the present invention, the outer wall of the bottle mouth is provided with an external thread, the inner wall of the connecting pipe is provided with an internal thread matching the external thread, and the connecting pipe and the bottle mouth are connected through the internal thread and the external thread. Threaded thread fit connection.

Further, the pore diameter of the first filter membrane in the present invention is 0.6-20 μm, and the pore diameter of the second filter membrane is 0.1-0.45 μm.

Compared with the prior art, the beneficial effects of the utility model are:

1. Two layers of filter membranes are arranged in the vacuum filter having both pre-filtration and fine filter functions described in the utility model, and a gap is formed between the two layers of filter membranes. When filtering, first pass through the first filter membrane. Pre-filtration, and then pass through the second filter membrane for fine filtration to make the filtration more thorough, realize pre-filtration and fine filtration in one step, and improve the filtration efficiency; it can be used for the filtration of chemicals, medicines, tissue culture fluids and other laboratory fluid solutions Sterile filtered.

2. The vacuum filter with both pre-filtration and fine filtration functions described in the utility model has a gap between the first filter membrane and the second filter membrane, which can ensure the formation of negative pressure in the filter chamber during suction filtration. Prevent the filtrate from clogging the membrane pores and keep the filtration smooth;

3. The vacuum filter with both pre-filtration and fine-filtration functions described in the present utility model is further detachably connected by buckle or screw connection among various parts, which is convenient for disassembly and assembly.

The utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment.

Description of drawings

Fig. 1 is the preferred structural representation of the vacuum filter with pre-filtration and fine filtration functions of the utility model;

Fig. 2 is an enlarged view of part A in Fig. 1;

Wherein, each reference sign is: 1, upper cup; 11, cup cover; 2, filter head; 21, filtering part; 22, connecting head; 221, outer casing; 24, the second filter membrane; 25, the air pressure cavity; 26, the nozzle; 27, the protrusion; 28, the connecting pipe; 3, the collection bottle; 31, the bottle body;

Detailed ways

As shown in Fig. 1 and Fig. 2, the vacuum filter with the functions of pre-filtration and fine filtration described in the utility model includes an upper cup 1 for containing filtrate and a bottom cup 1 installed on the bottom of the upper cup 1 for filtering. Filter head 2; the filter head 2 includes a filter part 21 and a connection head 22; the filter part 21 includes a filter cavity and a liquid outlet at the bottom of the filter cavity, the filter cavity communicates with the bottom of the upper cup 1, the filter A first filter membrane 23 and a second filter membrane 24 are sequentially arranged in the chamber from top to bottom, and there is a gap between the first filter membrane 23 and the second filter membrane 24; The outer casing 221 extending downward and the liquid outlet pipe 222 extending downward from the liquid outlet, the air pressure chamber 25 communicating with the liquid outlet pipe 222 and the filter cavity is formed between the outer casing 221 and the liquid outlet pipe 222; The side wall of 221 is provided with a nozzle 26 which communicates with the air pressure cavity 25 and is used to connect with an external suction filter device. When the vacuum filter device described in the utility model is in use, the air in the vacuum filter device is sucked away to form a negative pressure after the external connection is connected to the suction filter device, so that the filtrate passes through the first filter membrane 23 and the second filter membrane 24 in sequence. Then flow out along the liquid outlet pipe 222.

In Embodiment 1 of the present utility model, further, the outer periphery of the bottom of the upper cup 1 described in the present utility model is provided with an annular groove, and the outer peripheral wall of the filter chamber is provided with an annular protrusion 27 matching the annular groove. , the upper cup 1 and the filter head 2 are fastened to each other through the interference fit between the annular protrusion 27 and the annular groove. The advantage of this feature is that it can facilitate the disassembly and assembly between the upper cup and the filter head, and facilitate the replacement of the filter membrane and the cleaning of the filter head.

On the basis of Example 1, further, in Example 2 of the present utility model, the described vacuum filter with both pre-filtration and fine filtration functions also includes a collection bottle 3 for collecting filtrate, and the collection bottle 3 includes The bottle body 31 and the bottle mouth 32 arranged on the bottle body 31 , the connecting pipe 28 for connecting the bottle mouth 32 is extended from the outer sleeve 221 at the lower part of the connecting head 22 .

Specifically, in Embodiment 3, the inner diameter of the connecting pipe 28 described in the present invention matches the outer diameter of the bottle mouth 32 , and the connecting pipe 28 is sleeved on the outside of the bottle mouth 32 .

In Embodiment 4, in the vacuum filter described in the present utility model, the outer wall of the bottle mouth 32 is provided with an external thread, and the inner wall of the connecting pipe 28 is provided with an internal thread matching the external thread, and the connecting pipe 28 is connected to the bottle The mouth 32 is threadedly connected by an internal thread and an external thread.

In Embodiment 3 and Embodiment 4, in addition to the above two methods of connection between the connecting pipe 28 and the bottle mouth 32, other detachable connection methods that can be realized in the field can also be used.

On the basis of any one of the above embodiments, further, the pore size of the first filter membrane in the present invention is 0.6-20 μm, and the pore size of the second filter membrane is 0.1-0.45 μm. By setting filter membranes with different pore sizes, pre-filtration and fine filtration can be realized at the same time, so as to improve the efficiency of filtration.

On the basis of the above-mentioned embodiment 1, the cup opening of the upper cup 1 described in the present invention is provided with a cup cover 11 , and the cup cover 11 is fastened with the cup opening of the upper cup 1 . This solution is also applicable to other embodiments except embodiment 1. Further, the cup cover 11 may also be provided with air holes communicating with the outside air.

The above-mentioned embodiments are only preferred embodiments of the present utility model, and cannot be used to limit the scope of protection of the present utility model. The scope of protection required by the utility model.

Claims (7)

1. A vacuum filter with both pre-filtration and fine filtration functions, comprising an upper cup for containing filtrate and a filter head installed on the bottom of the upper cup for filtering; it is characterized in that the filter head includes a filter The filtering part includes a filter cavity and a liquid outlet at the bottom of the filter cavity, the filter cavity communicates with the bottom of the upper cup, and the filter cavity is sequentially provided with a first filter membrane and a second filter membrane from top to bottom. Two filter membranes, there is a gap between the first filter membrane and the second filter membrane; the connection head includes an outer sleeve extending downward from the periphery of the filter part and a liquid outlet pipe extending downward from the liquid outlet, the outer sleeve An air pressure chamber communicating with the liquid outlet pipe and the filter cavity is formed between the liquid outlet pipe; the side wall of the outer casing is provided with a nozzle connected to the air pressure chamber and used for connecting with an external suction filter device. 2. The vacuum filter with both pre-filtration and fine filtration functions according to claim 1, wherein an annular groove is arranged on the outer periphery of the bottom of the upper cup, and an annular groove is arranged on the outer peripheral wall of the filter chamber. The groove matches the annular protrusion, and the upper cup and the filter head are interlocked with each other through the interference fit between the annular protrusion and the annular groove. 3. The vacuum filter with both pre-filtration and fine-filtration functions according to claim 1, characterized in that, the mouth of the upper cup is provided with a cup cover, and the cup cover is fastened to the mouth of the upper cup. 4. The vacuum filter with prefiltration and fine filtration functions according to any one of claims 1-3, characterized in that, the vacuum filter with prefiltration and fine filtration functions also includes a collection of filtrate The collection bottle includes a bottle body and a bottle mouth arranged on the bottle body, and a connecting pipe for connecting the bottle mouth is extended from the lower part of the connecting head through the outer sleeve. 5. The vacuum filter with functions of pre-filtration and fine filtration according to claim 4, characterized in that, the inner diameter of the connecting pipe matches the outer diameter of the bottle mouth, and the connecting pipe is sleeved on the outside of the bottle mouth . 6. The vacuum filter with functions of pre-filtration and fine filtration according to claim 4, characterized in that, the outer wall of the bottle mouth is provided with an external thread, and the inner wall of the connecting pipe is provided with an internal thread that matches the external thread. The connecting pipe is threadedly connected with the bottle mouth through an internal thread and an external thread. 7. The vacuum filter with functions of prefiltration and fine filtration according to claim 1, wherein the pore diameter of the first filter membrane is 0.6-20 μm, and the pore diameter of the second filter membrane is 0.1-0.45 μm .