CN-121558254-B - Sealing detection device and method for boiler pressure vessel

CN121558254BCN 121558254 BCN121558254 BCN 121558254BCN-121558254-B

Abstract

The invention relates to the technical field of mechanical sensors, in particular to a sealing detection device and a sealing detection method for a boiler pressure container, wherein the sealing detection device for the boiler pressure container comprises an instrument main body, a first isolation diaphragm and a second isolation diaphragm, the lower end of the instrument main body is provided with an installation ring groove, the first isolation diaphragm is arranged in the installation annular groove, the installation annular groove is vertically isolated into a filling liquid groove and a medium liquid groove, a plurality of second isolation diaphragms are arranged, the plurality of second isolation diaphragms are sequentially arranged below the first isolation diaphragms in the vertical direction, and the plurality of second isolation diaphragms can all move in the vertical direction. The invention is provided with the first isolation diaphragms and the second isolation diaphragms, and the number of the second isolation diaphragms actually participating in force transmission can be dynamically adjusted by adjusting the number of the second isolation diaphragms which are stacked, so that the thickness of a 'diaphragm' formed by matching the second isolation diaphragms with the first isolation diaphragms is changed to adapt to the precision requirements under different sealing detection working conditions.

Inventors

CHEN XU
Wang Dianye
TIAN YINGYING
ZHANG WENHAO
YU YANG
LI CHANGYIN

Assignees

浩和金阳(北京)科技有限公司

Dates

Publication Date: 20260512
Application Date: 20251230

Claims (8)

1. A seal detection device for a boiler pressure vessel, comprising: the lower end of the instrument main body is provided with a mounting ring groove; the first isolation diaphragm is arranged in the mounting ring groove and is used for isolating the mounting ring groove into a filling liquid groove and a medium liquid groove from top to bottom; the plurality of second isolation diaphragms are sequentially arranged below the first isolation diaphragm in the vertical direction and can move in the vertical direction; The upper ends of the plurality of second isolation diaphragms are respectively provided with a rigid support ring, the upper ends of the rigid support rings are connected with adjusting screws, the adjusting screws are in threaded sealing connection with the instrument main body, the adjusting screws and the rigid support rings can synchronously move along the axis of the rigid support rings and relatively rotate around the axis of the rigid support rings, a first isolation ring and a second isolation ring are arranged in the mounting annular groove and above the first isolation diaphragm at intervals from outside to inside along the radial direction of the mounting annular groove, the second isolation ring is used for separating the filling liquid groove into an inner groove and an outer groove, a separation ring is arranged between the first isolation ring and the second isolation ring and used for separating the outer groove into a lower groove and an upper groove, the inner part of the upper groove is in sliding connection with an adjusting ring, the adjusting ring and the separation ring are mutually spaced along the vertical direction to form a compensation chamber, the compensation chamber is communicated with the inner groove, and the compensation chamber and the inner groove are filled with filling liquid; The adjusting ring can move in the vertical direction, so that the volume of the compensation chamber is changed, and the volume of the compensation chamber is positively correlated with the temperature of the filling liquid.
2. A seal inspection device for a boiler pressure vessel according to claim 1, wherein two horizontally adjacent rigid support rings are slidably connected.
3. The seal detection device of a boiler pressure vessel according to claim 2, wherein a first elastic member is provided between each of the adjacent two second isolation diaphragms, the first elastic member being configured to prevent the adjacent two second isolation diaphragms from approaching each other in a vertical direction.
4. The seal detection device of a boiler pressure vessel according to claim 1, wherein a connecting rod is arranged at the lower end of the adjusting ring, the connecting rod penetrates through the separating ring downwards and is in sliding connection with the separating ring, an induction ring is arranged at the lower end of the connecting rod, and the induction ring is in sliding connection with the groove wall of the lower groove.
5. The seal detecting apparatus of a boiler pressure vessel according to claim 4, wherein a second elastic member is provided between the adjusting ring and the top wall of the installation ring groove, the second elastic member preventing the adjusting ring from approaching the top wall of the installation ring groove.
6. The seal detection device of a boiler pressure vessel according to claim 1, wherein the filling liquid is silicone oil.
7. The seal detection apparatus for a boiler pressure vessel according to claim 1, wherein the first isolation diaphragm and the second isolation diaphragm are each a corrugated diaphragm.
8. A seal detection method of a boiler pressure vessel using the seal detection device of a boiler pressure vessel according to any one of the preceding claims 1 to 7, characterized by comprising the steps of: s100, determining a sealing detection working condition, namely determining that the detection precision required by the sealing detection working condition is extremely high precision, medium-high precision or medium-low precision; and S200, rotating an adjusting screw to adjust the number of the second isolation diaphragms in the stacked configuration.

Description

Sealing detection device and method for boiler pressure vessel Technical Field The invention relates to the technical field of mechanical sensors, in particular to a sealing detection device and method for a boiler pressure container. Background The boiler pressure vessel refers to a sealed pressure-bearing device that is subjected to a certain pressure load for the production or delivery of steam, hot water and high pressure gases. Since the boiler pressure vessel has safety risks such as explosion and leakage in the use process, the tightness test needs to be performed in the use process, wherein the mechanical sensor plays a key role in detecting the tightness of the boiler pressure vessel, and particularly in the pressure test stage. The mechanical sensor widely applied to the tightness detection of the boiler pressure vessel at present is a diaphragm pressure transmitter. When the pressure sensor is used, the pressure of a medium to be measured directly acts on the isolation diaphragm of the transmitter, the isolation diaphragm is an elastic element, so that the isolation diaphragm can generate elastic deformation in proportion to the pressure under the action of the pressure, inert filling liquid is filled in a sealed cavity between the isolation diaphragm and a sensing core (sensing diaphragm) in the transmitter, the deformation of the isolation diaphragm can form a hydraulic column through the filling liquid, the pressure is transmitted to the sensing diaphragm without loss, and the sensing diaphragm and a fixed electrode form a capacitor. The accuracy requirements for the tightness test of boiler pressure vessels are different in different tightness test stages, for example in conventional tightness test stages (e.g. air tightness/water pressure) the goal of which is to find smaller leaks, so that only medium and low accuracy is required, whereas in strength test and macroscopic inspection stages medium and high accuracy is required to verify structural integrity, whereas in precision and microleakage test stages extremely high accuracy is required to complete the positioning and quantifying microleakage. In order to be able to take account of multi-stage sealing test, most of diaphragm pressure transmitters used in the existing boiler pressure vessels are of medium-high precision standard, which inevitably causes poor precision of the detection device in the precision and micro-leakage test stage, and poor overpressure capacity and stability performance in the conventional tightness test stage. Disclosure of Invention Based on the above, it is necessary to provide a sealing detection device and a sealing detection method for a boiler pressure vessel, which solve the problem that the conventional middle-high precision sealing detection device performs poorly in the conventional sealing test stage and the precision and micro-leakage stage. The above purpose is achieved by the following technical scheme: A seal detection device for a boiler pressure vessel includes: the lower end of the instrument main body is provided with a mounting ring groove; the first isolation diaphragm is arranged in the mounting ring groove and is used for isolating the mounting ring groove into a filling liquid groove and a medium liquid groove from top to bottom; the plurality of second isolation diaphragms are sequentially arranged below the first isolation diaphragm in the vertical direction and can move in the vertical direction; the surface circumference of the second isolation diaphragm is provided with a plurality of vent holes at equal intervals, and the vent holes on two adjacent second isolation diaphragms are arranged in a staggered mode. Preferably, the upper ends of the plurality of second isolation diaphragms are respectively provided with a rigid support ring, the upper ends of the rigid support rings are connected with adjusting screws, the adjusting screws are in threaded sealing connection on the instrument main body, and the adjusting screws and the rigid support rings can synchronously move along the axis of the rigid support rings and relatively rotate around the axis of the rigid support rings. Preferably, two adjacent rigid support rings in the horizontal direction are slidably connected. Preferably, a first elastic member is arranged between two adjacent second isolation diaphragms, and the first elastic member is used for preventing the two adjacent second isolation diaphragms from approaching to each other along the vertical direction. Preferably, a first isolating ring and a second isolating ring are arranged in the mounting ring groove and above the first isolating diaphragm at intervals from outside to inside along the radial direction of the mounting ring groove, the second isolating ring is used for separating the filling liquid groove into an inner groove and an outer groove, a separating ring is arranged between the first isolating ring and the second isolating ring and used for separating t