Self control type pumping filter

Abstract

The invention provides a self-control filter, which is characterized in that a filtration container is a filtration tank which is made of metal or PVC material, a filter holder is arranged above the filtration tank, the outlet of the filter holder is connected into the filtration tank by a switch valve, a vacuum pump connector, a vacuum degree automatic regulating valve and an exhaust valve are arranged on the filtration tank, the extraction port of a vacuum pump is connected with the vacuum pump connector on the filtration tank, the lower part of the filtration tank is provided with a water drainage valve, a liquid level switch is arranged on the upper part of the inner side wall of the filtration tank, and the liquid level switch is connected in a control circuit of the vacuum pump by a cable. When the liquid level in the filtration tank is increased to drive the liquid level switch to act, the vacuum pump stops the operation so as to prevent the filtered liquid from entering the vacuum pump, the vacuum degree can be adjusted automatically, the whole filter is an integrated structure, the filtration tank is made of metal or PVC material, the filter is difficult to be crushed and has simple operation, convenient carrying and maintenance.

Description

technical field [0001] The invention is a water quality analysis test equipment, specifically a self-control suction filter. Background technique [0002] Suction filtration of seawater and freshwater samples is a necessary sampling method for research on primary productivity, phytoplankton pigments, and water chemical analysis of marine and inland waters. The suction filter device that generally uses at present is that vacuum pump, glass suction filter bottle, suction filter frame, filter are connected with pressure-resistant rubber hose and form. The device has the following problems: [0003] 1. Most of the suction filter containers are glass products, which are easy to cause collision damage, especially when sampling at sea, the glass suction filter bottles are often broken due to the shaking of the ship; [0004] 2. Other materials such as polyethylene plastic or metal products, because it is difficult to observe the height of the liquid level, it is easy to cause the...

AI Technical Summary

Problems solved by technology

[0003] 1. Most of the suction filter containers are glass products, which are easy to cause collision damage, especially when sampling at sea, the glass suction filter bottles are often broken due to the shaking of the ship;

[0004] 2. Other materials such as polyethylene plastic or metal products, because it is difficult to observe the height of the liquid level, it is easy to cause the filtered water to enter the vacuum pump and cause the vacuum pump to be damaged or burned;

[0005] 3. The degree of vacuum cannot be adjusted automatically, resulting in excessive negative pressure and easy to produce experimental errors. For example, when the negative pressure of phytoplankton pigment analysis samples exceeds 0.05Mpa, it is easy to cause phytoplankton cells to break and pigment loss;

[0006] 4. Scattered parts, inconvenient to carry and operate

[0007] The existence of the above problems directly affects the accuracy of the test, and in severe cases, the test cannot be completed

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