CN204502557U - A kind of use for laboratory Suction filtration device - Google Patents

Abstract

The utility model discloses a suction filter device for a laboratory, the main components of which are a sand core funnel, a suction filter bottle, a safety bottle, a filter and a vacuum pump. The utility model combines the sand core funnel with the suction filter bottle, and the two are connected by a screw thread made of a corrosion-resistant and stable performance polymer material, so that the device has good air tightness, corrosion resistance and easy separation; in the filter bottle A safety valve is set at the suction filter to prevent the filtrate from being pumped out of the bottle by bumping; the filter prevents harmful gases from being discharged into the air and causing environmental pollution. The suction filtration device involved in the utility model is accurate, efficient, durable and environmentally friendly in the working process, and has good application prospects.

Description

A laboratory suction filter

technical field

The utility model relates to a suction filtration device, in particular to a suction filtration device for a laboratory, which belongs to the technical field of chemical experiment equipment.

Background technique

In chemical experiments, for samples that are not easy to achieve solid-liquid separation by filtration under normal pressure, an aspirator is usually used to filter the sample to increase the pressure difference on both sides of the filter membrane (core) to achieve solid-liquid separation the goal of. Currently commonly used suction filtration devices mainly include Buchner funnels, suction filtration bottles, and air extraction devices. Suction flasks are mostly glassware, which is a kind of flask, and there is a side suction port at the mouth of the nozzle, which is used to connect the vacuum device. A simple suction filtration device is formed by installing a Buchner funnel on the suction filtration bottle. When in use, pump air through the suction port of the suction device (usually a vacuum pump) to form a vacuum inside the filter bottle, so that the liquid on the filter seat is sucked into the filter bottle, and the solid is absorbed by the filter paper in the filter seat. Or filter block to achieve solid-liquid separation.

In the suction filtration device currently used in the laboratory, the Buchner funnel is combined with the suction filtration bottle, and the two are generally connected by a rubber stopper or ground glass. However, the rubber stopper is prone to aging or corrosion and loses its elasticity, causing the device to leak air, so it needs to be replaced frequently. However, if there is a small amount of impurities stuck to the joint of ground glass, it is easy to cause the glass to stick together and cannot be separated.

Due to the low internal pressure of the suction filtration device, if the filtrate contains low-boiling components, it is easy to boil and enter the suction device. If it is a corrosive component, it may damage the suction device. When the filtrate contains volatile harmful gases or the substances in the filtrate undergo decomposition reactions to produce harmful gases, they will be discharged into the air through the air extraction device, causing air pollution, and will also cause corrosion or damage to the air extraction device.

Patent CN202555035U provides great convenience for the removal of filter paper by adding a movable inner container in the funnel (Buchner funnel). The upper surface of the annular bottom of the liner has a frosted surface, which does not solve the problem that the glass frosting will cause the adhesion to be difficult to separate.

Patent CN203196417U discloses a suction filter bottle, the funnel device and the liquid outlet device are connected to each other by grinding mouth, the connection is tight, and it is easy to disassemble and wash at the same time; Let it go to prevent too much filtrate from entering the aspirating pump and polluting the aspirating pump. However, the problem of easy adhesion of the grinding mouth is not solved, and no measures are taken for the gas that may be generated in the filtrate.

Utility model content

The purpose of the utility model is to provide a laboratory suction filter to solve the defects of the prior art. In order to achieve the above purpose, the utility model takes the sand core funnel and the suction filter bottle as the main components, and the two are connected by threads made of corrosion-resistant and stable polymer materials to form an accurate, efficient and durable suction pump. filter device.

Specifically, the utility model includes a sand core funnel, a suction filter bottle, a safety bottle, a filter, and a vacuum pump.

The sand core funnel includes a funnel body, a filter plate and a first threaded connection part.

The first screw connection part is arranged at the lower part of the sand core funnel.

The pore diameter of the filter plate is 0.6-9 μm.

Further, the pore diameter of the filter plate is 4.5-9 μm, or the pore diameter of the filter plate is 3-4 μm, or the pore diameter of the filter plate is 1.5-2.5 μm, or the pore diameter of the filter plate is 0.6-1.5 μm.

The suction filter bottle includes a bottleneck, a bottle belly, a bottle mouth, a suction filter tip and a safety valve.

The bottle mouth is provided with a second threaded connection part, and the suction filter is connected with the bottle belly. A safety valve is arranged at the place where the suction filter tip is close to the bottle wall, the main purpose of which is to prevent the filtrate from bumping. Due to the low pressure in the suction filter bottle, the boiling point of the filtrate in the suction filter bottle is lowered below the ambient temperature, and boiling occurs and is pumped into the empty bottle, resulting in waste of the filtrate, thereby causing experimental errors. The setting of the safety valve overcomes this defect. When bumping occurs in the filtrate, closing the safety valve can prevent the filtrate from being drawn out of the suction filter bottle.

The material of the first threaded connection part and the second threaded connection part is a corrosion-resistant polymer material with stable performance. Such threads are corrosion-resistant, not easily bonded together, and the two are relatively easy to separate.

Further, the material of the first threaded connection part and the second threaded connection part is polytetrafluoroethylene.

The safety bottle includes a first glass tube and a second glass tube, the first glass tube is connected to the filter through a rubber tube, and the second glass tube is connected to the air inlet of the vacuum pump through a vacuum tube. The parameters of the vacuum pump are: pumping rate 15L/s, motor power 2.2kW, pump shaft speed 320r/min, air inlet diameter 25-80mm.

The filter is arranged between the safety bottle and the suction filter bottle, and is used to absorb volatile harmful gases in the filtrate or harmful gases generated by the decomposition reaction of substances in the filtrate, so as to prevent air pollution or damage to the vacuum pump. The filter is connected with the suction filter tip of the suction filter bottle through a rubber tube.

Further, the filter is an activated carbon filter.

Further, in order to enhance the speed and efficiency of suction filtration, a closed cover is arranged on the upper part of the sand core funnel, which can cover the sand core funnel as a whole and keep the sand core funnel in a closed state as a whole. The closed cover is connected with the air outlet of the vacuum pump through a vacuum tube, which enhances the pressure difference between the upper and lower sides of the funnel of the sand core and improves the speed and efficiency of suction filtration.

The beneficial effects of the utility model are:

1. The connection between the funnel and the filter bottle is threaded, which has good airtightness. The thread is made of stable polymer material, which is corrosion-resistant, not easy to age, not easy to bond together, and easy to separate.

2. The suction port is equipped with a safety valve. When the filtrate bumps, the valve can be closed immediately to prevent the filtrate from being pumped out of the bottle, so as to avoid affecting the experimental results.

3. Equipped with a filter to prevent harmful gases from being sucked into the vacuum pump or discharged into the air, and prevent the vacuum pump from being corroded or polluted by the discharge of harmful gases.

Description of drawings

Fig. 1 is the schematic diagram of the suction filtration device of the utility model embodiment 1.

Fig. 2 is a schematic diagram of the suction filtration device of Embodiment 2 of the present utility model.

Among Fig. 1 and Fig. 2: 1, sand core funnel; 2, suction filter bottle; 3, safety bottle; 4, filter; 5, vacuum pump; 6, safety valve; 7, rubber tube; Cover; 11, sand core funnel body; 12, filter plate; 13, first threaded connection; 21, bottleneck; 22, bottle belly; 23, bottle mouth; 24, suction filter; 25, second threaded connection; 31. The first glass tube; 32. The second glass tube; 51. The air inlet of the vacuum pump; 52. The air outlet of the vacuum pump.

Detailed ways

Below in conjunction with accompanying drawing, the technical solution of the utility model is further described. It should be understood that the following examples are only used as specific illustrations and do not limit the scope of the present invention. Meanwhile, obvious changes and modifications made by those skilled in the art according to the present utility model are also included in the scope of the present utility model.

Example 1:

A suction filtration device, as shown in FIG. 1 , includes a sand core funnel 1, a suction filtration bottle 2, a safety bottle 3, a filter 4, a vacuum pump 5, and a safety valve 6.

The sand core funnel includes a funnel body 11 , a filter plate 12 and a first threaded connection part 13 . The first screw connection part 13 is arranged at the lower part of the sand core funnel 1 . The pore size of the filter plate 12 is 4.5-9 μm, or 3-4 μm, or 1.5-2.5 μm, or 0.6-1.5 μm.

The suction filter bottle 2 includes a bottleneck 21 , a bottle belly 22 , a bottleneck 23 and a suction filter 24 . The bottle mouth 23 is provided with a second threaded connection part 25 , and the suction filter 24 is connected with the bottle belly 22 . A safety valve 6 is arranged at the place where the suction filter 24 is close to the bottle wall. The material of the first threaded connection portion 13 and the second threaded connection portion 25 is polytetrafluoroethylene.

The safety bottle 3 includes a first glass tube 31 and a second glass tube 32, the first glass tube 31 is connected to the filter 4 through a rubber tube 7, and the second glass tube 32 is connected to the vacuum pump 5 through a vacuum tube 8. Air inlet 51. The filter 4 is arranged between the safety bottle 3 and the suction bottle 2, and the filter 4 is an activated carbon filter. The filter 4 is connected to the suction filter tip 24 of the suction filter bottle 2 through a rubber tube 7 . The parameters of the vacuum pump 5 are: pumping rate 15L/s, motor power 2.2kW, pump shaft speed 320r/min, air inlet diameter 25-80mm.

Example 2:

A suction filtration device, as shown in Figure 2, in addition to the device described in Embodiment 1, this embodiment also includes a closed cover 9 arranged on the upper part of the sand core funnel 1, and the closed cover 9 can hold the sand The core funnel 1 is covered as a whole, and the whole sand core funnel 1 can be in a closed state. The sealing cover 9 is connected with the air outlet 52 of the vacuum pump 5 through the vacuum tube 8 .

Claims (5)

1. A laboratory suction filter device, characterized in that: said suction filter device comprises a sand core funnel, a suction filter bottle, a safety bottle, a filter, a vacuum pump; The sand core funnel includes a funnel body, a filter plate and a first threaded connection; the first threaded connection is arranged at the lower part of the sand core funnel; the filter plate has an aperture of 0.6-9 μm; The suction filter bottle includes a bottleneck, a bottle belly, a bottle mouth, a suction filter, and a safety valve; the bottle mouth is provided with a second threaded connection, and the suction filter is connected with the bottle belly; A safety valve is provided near the mouth of the bottle wall; the material of the first threaded connection part and the second threaded connection part is a corrosion-resistant polymer material; The safety bottle includes a first glass tube and a second glass tube, the first glass tube is connected to the filter through a rubber tube, and the second glass tube is connected to the air inlet of the vacuum pump through a vacuum tube; The filter is arranged between the safety bottle and the suction bottle. 2. The suction filter device according to claim 1, characterized in that: the suction filter device also includes a closed cover, which is arranged on the top of the sand core funnel, and covers the sand core funnel as a whole during work, so that the sand The core funnel is in a closed state as a whole; The sealing cover is connected with the air outlet of the vacuum pump through a vacuum tube. 3. The suction filtration device according to claim 1 or 2, characterized in that: the pore diameter of the filter plate is 4.5-9 μm, 3-4 μm, 1.5-2.5 μm or 0.6-1.5 μm. 4. The suction filtration device according to claim 1 or 2, characterized in that: the material of the first threaded connection part and the second threaded connection part is polytetrafluoroethylene. 5. The suction filtration device according to claim 1 or 2, characterized in that: the filter is an activated carbon filter.