Internal pressurizing air detector

Abstract

The invention discloses an internal pressurizing air detector. The detector comprises a main seat, an air feed pump, a plugging cylinder, a compression cylinder, an axial tube, a limiting seat and a joint support; a compression piston rod is provided with a positioning plate; an end piston rod is provided with a driving rack; the axial tube is provided with 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; the axial tube is provided with a first air inlet, and the first air inlet is provided with a first air-in unidirectional valve; the outer wall of the axial tube is provided with a first air pressure sensor; a steel-plastic transition joint supported by the joint support is placed between the limiting seat and the plugging cylinder; and an air supply end of the air feed pump is communicated with the internal of the axial tube via an air supply pipe. The internal pressurizing air detector has the advantages that the whole structure is reasonable, the steel-plastic transition joint is positioned and clamped in place, the sealing performance is ensured, the steel-plastic transition joint is not damaged due to clamping, and a sealing structure capable of adaptive adjustment can strengthen the sealing effect during high air pressure detection.

Description

technical field [0001] The invention belongs to the technical field of tightness testing of pipe joints, and in particular relates to an internal pressurized gas 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 ...

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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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