Miniature one-way valve and miniature air pump with same

Abstract

The invention provides a miniature one-way valve and a miniature air pump with the same. The miniature one-way valve comprises a valve sleeve and a valve element arranged in a fixed air chamber in the valve sleeve, a cavity is formed in the valve element, one end of a reset spring is located in the cavity, and the outer wall of the valve element makes contact and sliding fit with the inner wall of the fixed air chamber; and a plurality of vent holes communicating with the cavity are formed in the inner shrinkage end of the valve element in the circumferential direction, so that the fixed air chamber is communicated with the cavity. According to the miniature one-way valve, the outer wall of the valve element is in contact sliding fit with the inner wall of the valve sleeve, and the inner wall of the valve sleeve serves as a guide mechanism of the valve element, so that high-speed reciprocating motion of the valve element in the fixed air chamber is more stable; and an air flow channel reaches an exhaust hole through the cavity of the valve element, the air flow is large and stable, and the response speed of opening or closing of the one-way valve can be improved. The miniature one-way valve is compact in structure, small in size and suitable for miniature air pumps in high-frequency pressure generation occasions.

Description

technical field [0001] The invention relates to a one-way valve in the technical field of pressure calibration, in particular to a miniature one-way valve with reliable operation and sensitive response and a miniature air pump provided with the one-way valve. Background technique [0002] In the case of on-site pressure calibration, it is usually necessary to use a micro air pump to generate high-pressure gas to achieve predetermined pressure control. In this process, a one-way valve is required to realize the sealing and circulation of high-pressure gas. The working principle of a traditional one-way valve is that the valve core on the gas channel performs high-frequency reciprocating motion under the action of the pressure difference between the two ends, so as to achieve the effect of one-way conduction and reverse cut-off. Common miniature check valves (see Figure 1A with Figure 1B ), the valve core 2 is located in the valve sleeve 3, the first sealing ring 5 is sleev...

AI Technical Summary

Problems solved by technology

Common miniature check valves (see Figure 1A and Figure 1B ), the valve core 2 is located in the valve sleeve 3, the first sealing ring 5 is sleeved on the outer peripheral end of the valve core 2, and is located at one end of the air inlet hole of the miniature check valve, the return spring 1 is sleeved on the outer circumference of the valve core, and Located at one end of the exhaust hole of the miniature check valve, there is a gap between the outer wall of the valve core 2 and the inner wall of the valve sleeve 3, and the air flow channel is the gap between the valve core 2, the first sealing ring 5 and the inner wall of the valve sleeve 3, Because the outer wall of the valve core 2 is not in contact with the inner wall of the valve sleeve 3, the valve sleeve 3 cannot play a guiding role for the high-speed reciprocating movement of the valve core 2, and the operation of the valve core 2 is unstable, and during the high-speed movement of the valve core 2, The movement of the valve core 2 may be stuck due to rotation, or because the first sealing ring 5 sleeved on the valve core follows the high-speed movement of the valve core 2, the first sealing ring 5 is prone to expand under long-term high pressure, As a result, the gap between the first sealing ring 5 and the inner wall of the valve sleeve 3 becomes smaller, and the gas resistance is larger when the high-pressure gas passes through, which affects the opening and closing of the check valve. For example, the opening and closing speeds are slow, If the response is not timely, at the same time, the first sealing ring 5 is easy to fall off, which makes the sealing effect between the first sealing ring 5 and the inner wall of the valve sleeve 3 worse, and in severe cases, it may permanently fail and affect the overall pressure making efficiency of the micro air pump

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