Lever-type logic switch
A logic switch and lever-type technology, applied in the field of lever-type logic switches, can solve the problems of multiple bellows, affecting the performance of the controller, and poor accuracy.
Active Publication Date: 2012-07-04
SHANGHAI ZHUMIAO TECH CO LTD +1
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Problems solved by technology
The straight-top controller has a simple structure, but its components require high machining accuracy, and its setting spring force is in line with the pressure-sensitive element, so the controller has a relatively high pressure.
In order to balance the large control pressure, it is necessary to use a bias element with high stiffness, but the torsion force and stress generated by the bias element with high stiffness will be large, which will affect the performance of the controller
The knife bracket lever controller uses a lever bent from a steel plate to transmit the sensed pressure or temperature change. The disadvantage is that it is large in size, requires more bellows, and has poor accuracy.
Method used
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[0021] In the following detailed description of the preferred embodiment, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings show, by way of example, specific embodiments in which the invention can be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments in accordance with the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. Accordingly, the following detailed description is not limiting, and the scope of the invention is defined by the appended claims.
[0022] In the following detailed description, reference is made to the accompanying drawings. The accompanying drawings, which constitute a part of this invention, show by way of example specific embodiments in which the invention can be practiced. In this regard, directional terms such as "left", "right", "top"...
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The invention relates to a lever-type logic switch, which comprises a lever, a sensing element, an offset element, a force balance base and a micro-switch, wherein the lever is coupled to a lever bracket so as to be enabled to rotate around the lever bracket; the sensing element is used for sensing fluid characteristic change and loading a sensing force relevant to the sensed fluid characteristic change on the lever; the offset element is used for loading a pre-tightening force on the lever; the force balance base is used for loading a balance force on the lever; the micro-switch is coupled to the lever and is closed or switched off by responding to change of force loaded on the lever by the sensing element, the offset element and the force balance base; wherein the offset element comprises an offset spring and a spring base which are connected mutually, wherein the spring base is provided with a circular internal hole which is aligned to the center of the offset spring; the lever is provided with a second protuberance toward the circular internal hole; and the second protuberance is provided with a convexity matching the circular internal hole so as to be contained in the circular internal hole at least in part.
Description
technical field [0001] The present invention relates to the technical field of automatic control, more specifically, to a lever type logic switch. Background technique [0002] Logic switch (or called pressure logic switch) is a kind of control instrument widely used in automation control system. Logic switches are commonly used to measure the pressure or temperature of fluids such as gases or liquids. When the pressure or temperature of the measured fluid is higher or lower than the rated value, the logic switch will act accordingly to change the on-off state of the microswitch it contains, so as to achieve the purpose of automatic control. [0003] The existing logic switch usually adopts a straight-top type or a knife holder lever type controller. The straight-top controller has a simple structure, but its components require high machining accuracy, and its setting spring force is in line with the pressure-sensitive element, so the controller has a relatively high press...
Claims
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IPC IPC(8): H01H35/26H01H37/02
Inventor 赵知渊刘琢陈卫华瞿晶晶王介兰吴斌麻金娜
Owner SHANGHAI ZHUMIAO TECH CO LTD