Rotary valve pump

Abstract

The invention discloses a rotary valve pump. The rotary valve pump is characterized in that a pump sleeve is arranged in a pump sleeve hole in a shell in a clearance fit manner, and an end of the pumpsleeve is sealed by a second sealing component; a pump rod is arranged in a pump rod hole in the pump sleeve in a clearance fit manner, and sealing components are omitted between the pump rod and thepump sleeve; at least two first step holes are formed in the wall surfaces of the shell, a liquid outlet nozzle and a liquid inlet nozzle are mounted on the wall surfaces of the shell, and liquid inlet and outlet channels of the liquid outlet nozzle and the liquid inlet nozzle are correspondingly communicated with liquid inlet and outlet holes in the pump sleeve and are sealed by first sealing components. The rotary valve pump has the advantages that outer-diameter side of the pump sleeve is in clearance fit with the hole-diameter side of the pump sleeve hole, the pump sleeve and the shell are independent from each other, the pump sleeve is easy to disassemble and thoroughly wash, users only need to replace the pump sleeve without replacing the shell after the rotary valve pump is used for a long term and is abraded, and accordingly the use cost can be effectively saved; flat surfaces are arranged on the pump sleeve and correspond to the liquid inlet and outlet channels, the first sealing components are arranged between the end surfaces of the liquid outlet nozzle or the liquid inlet nozzle and the flat surfaces, a circular counter-bored hole is formed in a rear cover, the secondsealing component is arranged in the circular counter-bored hole, and the first sealing components and the second sealing component can prevent liquid from leaking into gaps between the pump sleeve and the shell.

Description

Technical field [0001] The invention relates to the technical field of pumps, in particular to a rotary valve pump. Background technique [0002] At present, in the pharmaceutical, environmental engineering, petroleum and chemical industries, because ceramic materials are wear-resistant, corrosion-resistant, and high-temperature resistant, the key components of rotary valve pumps, such as pump rods and pump sleeves, are mostly made of ceramic materials. The shell is generally made of metal materials such as stainless steel, aluminum, etc. The ceramic pump sleeve and the metal shell are usually heated and expanded by the heat-sleeve process to cooperate. In order to achieve the sealing effect, the internal structure is more complicated, and there are many sets between the pump sleeve and the shell. Seals, gaskets and other sealing parts to prevent liquid leakage, especially the sealing parts set on the periphery of the pump rod and other movable parts. After the pump rod rotates o...

AI Technical Summary

Problems solved by technology

[0003] The applicant aims at the disadvantages of the above-mentioned existing rotary valve pumps, such as complex structure, easy wear and tear of the dynamic seal, poor sealing effect, high dimensional accuracy requirements of the shrink-fit process, and easy to cause liquid to flow into the gap and cause pollution after thermal cycle, etc., to provide a reasonable structure. Rotary valve pump, simple in structure, easy to disassemble, flexible to replace the pump sleeve, widely used in food, medicine and other liquid fields with high quality requirements

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