Positive and negative pressure protector

Abstract

The invention relates to a positive and negative pressure protector comprising a box body, a connecting pipe, a first central pipe, a positive pressure cavity sealing sleeve, a second central pipe, a negative pressure cavity sealing sleeve and a vent pipe. The box body is provided with a positive pressure cavity and a negative pressure cavity located below the positive pressure cavity. A pipe opening at one end of the connecting pipe is connected with a connecting opening in the side wall, between the positive pressure cavity and the negative pressure cavity, of the box body, and a pipe opening at the other end of the connecting pipe is connected with equipment needing to be protected. The first central pipe is located in the positive pressure cavity, and a pipe opening at the bottom of the first central pipe is formed in the bottom of the positive pressure cavity and communicates with air transmitted to the lower portion of the positive pressure cavity from the connecting pipe. The positive pressure sealing sleeve is arranged on the first central pipe in a sleeving mode and seals a pipe opening at the top of the first central pipe. The second central pipe is located in the negative pressure cavity, and a pipe opening at the bottom of the second central pipe is located at the bottom of the negative pressure cavity and communicates with air below the negative pressure cavity. The negative pressure cavity sealing sleeve is arranged on the second central pipe in a sleeving mode and seals a pipe opening on the top of the second central pipe. The vent pipe is located above the positive pressure cavity, a pipe opening at one end of the vent pipe communicates with the positive pressure cavity, and a pipe opening at the other end of the vent pipe is used for discharging air conveyed from the positive pressure cavity.

Description

technical field [0001] The invention relates to the technical field of biogas storage container protection, in particular to a positive and negative pressure protector. Background technique [0002] In the biogas production industry, the pressure of the equipment has certain restrictions. Whether it is a fermentation tank or a biogas storage tank, a pressure protection device is required to protect the normal operation of the equipment and prevent the equipment from being burst when the pressure exceeds the pressure capacity. Negative pressure is flattened. [0003] At present, the positive and negative pressure protector is the most used in the biogas fermentation tank on the market to protect the positive and negative pressure inside the equipment. The positive and negative pressure protector generally adopts the principle of liquid seal. When the pressure value in the equipment is higher than a certain pressure, it is called positive pressure. To achieve the function of...

AI Technical Summary

Problems solved by technology

However, this kind of positive and negative pressure protector has a shortcoming. Because it adopts a liquid seal, the exhaust and air intake are realized by the height difference of the liquid level. Therefore, the amount of liquid must be relatively accurate to make a certain pressure correspond to a certain pressure. The liquid level height difference, but the liquid is easy to evaporate in the hot summer, so that the amount of water becomes less

Once the water volume changes, the pressure of the protector will be inaccurate, and the protection effect on the equipment will not be achieved, and frequent manual inspection and liquid addition are required

In addition, the commonly used positive and negative pressure protectors are two sets of devices, and the positive pressure and negative pressure are designed separately. This separate design makes installation and maintenance complicated, high in cost, and takes up a large area.

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