Pneumatic diaphragm box of regulating valve

Abstract

The utility model discloses a pneumatic diaphragm box of a regulating valve. The pneumatic diaphragm box comprises a diaphragm, a left-handed spring and a right-handed spring, wherein the left-handed spring and the right-handed spring are arranged on the diaphragm; on the basis, in the pneumatic diaphragm capsule, a half of the designed total number of springs is changed into a right-handed rotation mode, and the springs are arranged at intervals in a staggered mode; the torsion stress is eliminated through the rotation of the spring seat through the mutual restriction of the rotation stress of the left-handed spring and the right-handed spring. Torsion stress is effectively prevented from acting on the pneumatic diaphragm, and meanwhile the problem of torsion of the valve rod is solved. Precise sensitive elements such as expensive positioners and rubber diaphragms are well protected, the adjusting stability of the valve is improved, the service life of the valve is prolonged, and the valve has high economic value.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pneumatic film box of a regulating valve. Background Art

[0002] When the stroke of the pneumatic diaphragm actuator of the control valve is greater than 60-100mm, the valve stem will always twist during the lifting stroke, which will shorten the life of the rubber diaphragm. In severe cases, the valve stem will be deformed by torsional stress, affecting the adjustment accuracy of the positioner and causing fluctuations in the positioner. This will seriously affect the pipeline process conditions and valve quality performance during field use. Through research, it was found that the main reason is that the cylindrical helical spring used in the diaphragm box is subjected to rotational stress during the compression process. Utility Model Content

[0003] The utility model aims to provide a pneumatic membrane box of a regulating valve to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a pneumatic diaphragm box of a regulating valve, comprising a diaphragm, a left-handed spring and a right-handed spring installed on the diaphragm; the number of the left-handed springs is equal to the number of the right-handed springs, and the left-handed springs and the right-handed springs are distributed on the diaphragm at intervals.

[0005] By adopting the above technical solution, the utility model has the following beneficial effects: in the pneumatic diaphragm box, half of the total number of springs are replaced with right-hand springs, staggered and installed, and flat rotatable spring seats are installed at both ends of the springs. The torsional stress is eliminated by rotating the spring seat through the mutual restraint of the rotational stress of the left-hand and right-hand springs. The torsional stress is effectively prevented from acting on the pneumatic diaphragm, and the problem of valve stem torsion is solved. The expensive positioner and other precision sensitive components and rubber diaphragms are well protected, the adjustment stability and service life of the valve are improved, and the economic value is very high. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the main structure of the utility model.

[0007] In the figure: 1, diaphragm; 2, left-handed spring; 3, right-handed spring. DETAILED DESCRIPTION

[0008] Embodiments of the present utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present utility model, and should not be construed as limitations on the present utility model. In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "upper surface", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.

[0009] See also Figure 1 The utility model provides an embodiment: a pneumatic diaphragm box of a regulating valve, comprising a diaphragm 1, a left-handed spring 2 and a right-handed spring 3 installed on the diaphragm 1; the number of the left-handed springs 2 and the right-handed springs 3 are equal, and the left-handed springs 2 and the right-handed springs 3 are distributed on the diaphragm 1 at intervals.

[0010] In summary, in the pneumatic diaphragm box, half of the total number of springs are replaced with right-hand springs, that is, left-hand spring 2 and right-hand spring 3 are installed at intervals, and flat rotatable spring seats are installed at both ends of the springs. Through the mutual restraint of the rotational stress of the left-hand and right-hand springs, the torsional stress is eliminated through the rotation of the spring seat. The torsional stress is effectively prevented from acting on the pneumatic diaphragm, and the problem of valve stem torsion is solved. It protects the expensive positioner and other precision sensitive components and rubber diaphragms well, improves the adjustment stability and service life of the valve, and has high economic value.

[0011] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A pneumatic diaphragm box for a regulating valve, characterized in that: It comprises a diaphragm (1), a left-handed spring (2) and a right-handed spring (3) mounted on the diaphragm (1); The number of the left-handed springs (2) and the right-handed springs (3) is equal, and the left-handed springs (2) and the right-handed springs (3) are distributed on the diaphragm (1) at intervals.

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