Sealed leak detection device

Abstract

The invention discloses a sealed leak detection device. The device comprises a main engine seat, a gas supply pump, a plugging cylinder, a compressed cylinder, a shaft pipe, a limit seat and a joint support frame, a locating plate is arranged on a compressed piston rod, a driving frame is arranged on a capped end piston rod, a plastic pipe outer end sealing plate, a steel pipe outer end sealing plate, a plastic pipe outer sealing ring and a steel pipe outer sealing ring are arranged on the shaft pipe, a first air inlet is formed in the shaft pipe, a first air inlet one-way valve is arranged on the first air inlet, a first pressure sensor is arranged on the outer wall of the shaft pipe, a steel-plastic conversion connector supported by the joint support frame is located between the limit seat and the plugging cylinder, and the gas supply end of the gas supply pump is communicated with the inner part of the shaft pipe through a gas supply pipe. The sealed leak detection device disclosed by the invention has the beneficial effects of reasonable whole structure, in-place positioning and clamping for the steel-plastic conversion connector, capacity of guaranteeing sealing without damaging the steel-plastic conversion connector by a clamping action, and adaptively adjusted sealing structure and capability of strengthening the sealing effect during high-pressure detection.

Description

technical field [0001] The invention belongs to the technical field of tightness testing of pipe joints, in particular to a closed leak detection device. Background technique [0002] Steel-plastic conversion joints, also known as PE steel-plastic conversion joints, have been widely used in current production and life. For example, steel-plastic conversion joints are widely used in gas and natural gas transportation pipelines (most of the external gas pipelines are PE Pipes are mostly steel pipes when entering the room, and steel-plastic conversion joints are required during the transfer process). The steel-plastic conversion joint itself consists of a steel pipe section (a section of steel pipe) and a plastic pipe section (usually a section of PE pipe). One end of the steel pipe section is docked with one end of the plastic pipe section to form a connection section. The connection section is usually clamped by one end of the steel pipe section and one end of the plastic pip...

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Problems solved by technology

[0004] The above-mentioned test method has the following disadvantages: 1. The operation process is complicated, and the weight of the frame is relatively heavy. It is necessary to immerse the frame in water with the help of external equipment, and the installation of the steel-plastic conversion joint is also relatively troublesome; When the steel-plastic conversion joint is sealed and the sealing ring is placed outside the two ends of the steel-plastic conversion joint, and the hydraulic cylinder (or air cylinder) is used to clamp the two ends of the steel-plastic conversion joint for sealing, the strength of both is difficult to control. If the pressing or clamping force is not enough, the seal at the end of the steel-plastic conversion joint may not be reliable, which will affect the accuracy of the test and cause misjudgment of quality. If the pressing or clamping force is excessive, it may cause The deformation of the steel-plastic conversion joint causes the end face (pipe end) of the steel-plastic conversion joint to be uneven, which makes it impossible to form a seal between the steel-plastic conversion joint and the pressure plate, resulting in misjudgment of quality. Excessive force may also directly damage the steel-plastic conversion joint

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