81results about How to "Check air tightness" patented technology

The invention discloses a full-automatic airtightness detection device and method for a fuel cell stack. The device comprises a gas storage bottle, a main gas inlet pipe, three branch gas inlet pipescommunicated with the gas outlet end of the main gas inlet pipe, a main gas outlet pipe, three branch gas outlet pipes communicated with the gas inlet end of the main gas outlet pipe, a pressure detector and a gas flow meter; the gas inlet end of the main gas inlet pipe is communicated with the gas storage bottle; the three branch gas inlet pipes are communicated with gas inlets of a hydrogen cavity, a water cavity and an air cavity of the fuel cell stack respectively; the three gas outlet pipes are communicated with gas outlets of the hydrogen cavity, the water cavity and the air cavity of the fuel cell stack respectively; the main gas inlet pipe, the three branch gas inlet pipes and the three branch gas outlet pipes are provided with valves respectively, the pressure detector is installed on the main gas inlet pipe and located in a pipeline section between the valve of the main gas inlet pipe and the branch gas inlet pipes, and the gas flow meter is installed on the main gas outlet pipe. Thus, the airtightness of the fuel cell stack can be detected fully automatically, the labor cost is reduced, and the airtightness can be quantified.

The invention relates to the technical field of valve detection equipment, and particularly relates to fire valve pressure test equipment and a detection method thereof. The fire valve pressure test equipment comprises a workbench which is provided with a water tank. A support is arranged in the water tank. At least one set of detection position is arranged on the support. The two sides of the water tank or the workbench of the two sides of the water tank or the two sides in the water tank are provided with an elevating mechanism which can drive the support to move upward and downward in the water tank. Working of the detection positions and the elevating mechanism is controlled by a controller. The advantages of the fire valve pressure test equipment and the detection method thereof are that airtightness of a fire valve can be accurately detected, accuracy of the detection process can also be guaranteed, and the fire valve pressure test equipment and the detection method thereof can be suitable for the fire valve of different sizes and detection efficiency is high.

The invention discloses a leakage detection device for an engine front cover assembly. The leakage detection device for the engine front cover assembly is characterized by comprising a workpiece station, a clamp body, an oil hydraulic system, a pneumatic system, an oil seal detection device body (10), an air tightness detection device body (5), a water detection system and an electrical system which are arranged on a machine frame body, wherein the oil seal detection device body (10) is provided with a laser distance measuring sensor, and the laser distance measuring sensor is used for measuring the installation height and the depth of parallelism of an oil seal. According to the leakage detection device, the installation size of the oil seal and the air tightness of the front cover assembly can be rapidly and efficiently detected, the overall structure is redesigned and constructed, so that a leakage test tool and a press fitting tool can be further combined, non-interfering operationcan be realized, and therefore air tightness detection and press fitting can be integrated, the structure is simple, the occupied area is small, the utilization rate of a machine table can be improved, and meanwhile, the cost investment can be reduced.

The invention discloses a pipeline welding structure for a pull pipe construction method. The pipeline welding structure comprises an outer sleeve at a pipeline joint, more than one welding slot is arranged at each of two ends of the outer sleeve, the welding slots do not run through the pipe wall of the outer sleeve; at two sides of the outer sleeve and in the welding slots, the outer sleeve is welded with a pipeline in the outer sleeve; on the inner wall of the outer sleeve, a first welding rod, a second welding rod, a third welding rod and a fourth welding rod are arranged in the middle of the outer sleeve; the pipeline joint is located between the second welding rod and the third welding rod; and the first welding rod, the second welding rod, the third welding rod and the fourth welding rod are connected between the outer sleeve and the pipeline in a sealed way by adopting a hot melting manner. The pipeline welding structure is simple in structure, and the arrangement of the outer sleeve structure ensures the firmness and tightness of welding of two pipelines in long-distance traction and drawing.

The invention, which belongs to the technical field of equipment for testing the sealing performance of a container through fluid, discloses pressure intensity experiment instrument detection equipment comprising a sealing cover and an air inlet part. The air inlet part comprises an air pump and an air inlet pipe communicated with the air pump, the air inlet pipe penetrates through the sealing cover. The pressure intensity experiment instrument detection equipment further comprises a supporting table, a vertical lower pressing piece is arranged on the supporting table, a pressing block is fixed to the bottom of the lower pressing piece, and the sealing cover is arranged at the bottom of the pressing block. The detection equipment further comprises a detection part including a frame body transversely connected to the supporting table in a sliding mode, a mounting frame is arranged on the frame body, two mounting strips are fixed to the mounting frame, and a thin film is fixed between the two mounting strips. Therefore, problems that in the prior art, after sealing performance detection is conducted, since a large amount of water adheres to a container, drying needs to be conducted,and operation is troublesome are solved.

The invention discloses a device and method for detecting the air tightness of an air path. The device includes a dehydration device, an air chamber and a suction pump which are arrange in sequence, the dehydration device is provided with an air inlet, a pressure sensor is installed on the air path between the air chamber and the suction pump, the device also includes a control system, the controlsystem is connected with the pressure sensor and the suction pump, when the air inlet is closed, whether gas tightness of a first air path meets the requirements is determined by a plurality of pressure values of the first air path when the suction pump is in different operation states, and the first air path is the air path between the dehydration device and the suction pump. The device has theadvantages that: detection can be performed on the air tightness of the air path momentarily, and the detection result can be fed back.

The invention discloses a novel air cylinder quality verification device. The novel air cylinder quality verification device is composed of an air compressor, an air pipe and a verification platform frame. Three air cylinders can be simultaneously arranged on the verification platform frame. The air pipe is connected with reversing valves of the three air cylinders through an air pipe tee joint and an elbow. The direction of high pressure air entering the air cylinders is changed by controlling the reversing valves through an external control cabinet so that the air cylinders can drive air cylinder pull rods to reciprocate. In the movement process of the air cylinder pull rods, whether air leakage exists around the air cylinders or not is verified by observing the surface profiles of the air cylinders and the movement states of the air cylinder pull rods so as to judge whether the defects of surface quality problems, air leakage and the like exist in the air cylinders or not. When used for conducting air cylinder quality detection, the novel air cylinder quality verification device can externally complete verification of performance such as the stroke, the stability, the air tightness and the surface machining quality for the air cylinders through one-time installation, the process is simple and efficient, and meanwhile the novel air cylinder quality verification device is simple in structure and reliable, and allows installation blades of the air cylinders to be easily detached.

The invention discloses a liquid flow system of a flow cytometer, an air tightness detection method and a flow cytometer. The liquid flow system comprises a sheath liquid device, a negative pressure device, a testing device and a sample loading device. The sheath liquid device comprises a sheath liquid pipeline communicated with the liquid inlet, a first sheath liquid control valve arranged on thetank flushing pipeline, a sheath liquid pump arranged on the sheath liquid pipeline, a sheath liquid pressure sensor and a second sheath liquid control valve, and the tank flushing pipeline is also communicated with the sheath liquid pipeline; the negative pressure device is communicated with the flow chamber and used for generating negative pressure for the liquid flow system; the testing devicecomprises a flow chamber and a negative pressure control valve arranged at a liquid outlet of the flow chamber; and the sample loading device comprises a sample loading pipeline communicated with a sample loading opening of the flow chamber, a sampling part arranged on the sample loading pipeline and a sample control valve. The liquid flow system can improve the accuracy of liquid path air tightness detection and blockage detection and reduce the cost of instruments.

The invention discloses a full-automatic running-in detection system and method for a rail transit cylinder. The system comprises a gas storage tank, a total pressure sensor, a cylinder running-in detection system and a plurality of cylinder component systems, wherein the total pressure sensor is arranged at the gas outlet end of the gas storage tank; the cylinder component systems comprise a gastransmission main pipe and a cylinder; the gas transmission main pipe is hermetically communicated with the gas storage tank; a first electromagnetic valve and a pressure sensor are arranged on the gas transmission main pipe; the gas transmission main pipe is hermetically communicated with a first branch pipe and a second branch pipe; the first branch pipe is hermetically communicated with the left part of the cylinder; the second branch pipe is hermetically communicated with the right part of the cylinder; a second electromagnetic valve is arranged on the first branch pipe; and a third electromagnetic valve is arranged on the second branch pipe, and the pressure sensor, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, a left limit sensorand a right limit sensor are respectively connected with the cylinder running-in detection system. The full-automatic running-in detection system and method for the rail transit cylinder not only candetect the air tightness of a plurality of cylinders, but also can detect the air tightness of the cylinders again after a plurality of times of grinding.

The invention belongs to the detection equipment technical field and relates to an air tightness pressure-maintaining test apparatus. The air tightness pressure-maintaining test apparatus comprises a first sealing cavity and a second sealing cavity; the first sealing cavity is connected with a gas source and is used for maintaining pressure and providing gas for the second sealing cavity; the second sealing cavity is used for accommodating a test device to be tested; a connecting pipeline between the first sealing cavity and the gas source and a connecting pipeline between the first sealing cavity and the second sealing cavity are both provided with a control device; the control device is used for gas communication and gas interruption control; the air tightness pressure maintaining test apparatus further comprises a first pressure detection device and a second pressure detection device which are respectively used for detecting pressure in the first sealing cavity and the second sealing cavity. With the air tightness pressure-maintaining test apparatus adopted, the air tightness of the device to be tested can be detected quickly and accurately. The air tightness pressure maintaining test apparatus has the advantages of simple structure, low manufacturing cost and low cost.

The invention aims to provide a device for automatically detecting sealing performance. A workpiece is placed on a placement groove block, a push-down oil cylinder drives a sliding plate to move downwards, the workpiece is pressed by a press head, a first hole blocking air cylinder and a second hole blocking air cylinder are started so that holes of the workpiece are blocked by a first hole blocking ring and a second hole blocking ring, the air cylinders are pushed rightwards to rightwards push an inflatable pump, the inflatable pump is used for inflating the workpiece, the push-down oil cylinder and a lifting motor are started, the sliding plate and an installation plate are driven to descent to a water box, the workpiece is soaked in a water level, whether bubbles are generated in the water level is observed, so that the air tightness of the workpiece is detected; and moreover, a monitoring camera is arranged to monitor the water level, the air tightness of the workpiece can be efficiently and rapidly detected, and the device is convenient to operate and is applicable to production.

The invention discloses an air tightness detection device for a valve group of an automobile air-conditioning compressor, which comprises a support plate, a push rod is arranged on the left side of the upper surface of the support plate, and a lithium battery pack and a lithium battery pack are arranged on the upper surface of the support plate from left to right in sequence. For a vacuum pump, support rods are provided around the upper surface of the support plate, and a support plate is provided on the upper end surface of the support rod. The upper surface of the support plate is sequentially provided with a positioning plate, a positioning column, a single-chip microcomputer, a hollow detection box and a display screen from left to right. The positioning column is sleeved with a pressure plate. The air-tightness detection device for the valve group of the automobile air-conditioning compressor has a simple structure, is easy to operate, and takes up little space when used. It can easily detect the air-tightness of the valve group of the automobile air-conditioning compressor. , the use of the locking universal wheel combined with the push rod makes the present invention can move the position very conveniently, the position of the part under test can be fixed through the pressure plate, and the setting of the display screen allows people to intuitively check the airtightness of the part under test sex to understand.

The invention belongs to the technical field of detection tools, and relates to a diaphragm airtightness detection automation device and a use method thereof, the diaphragm airtightness detection automation device comprises a rack, a positioning tool, a detection mechanism and a conveying mechanism; the rack comprises an upper frame and a lower frame, the detection mechanism comprises a three-axisdisplacement table, a transverse support and a vacuum sucker, and the three-axis displacement table is installed in the upper frame; a transverse bracket and a vacuum chuck are mounted on the three-axis displacement table; the positioning tool comprises an air cylinder, polished shafts, a pressing plate, a connecting plate, lower jigs and upper jigs; the air cylinder is installed in the lower frame, the connecting plate is arranged on a piston rod of the air cylinder, the two ends of the connecting plate are fixedly connected with the polished shafts, the pressing plate is fixedly arranged atthe tops of the polished shafts, and the multiple upper jigs are arranged at the bottom of the pressing plate. A plurality of lower jigs are arranged at the top of the lower frame, the two sides of the diaphragm are covered with the upper jigs and the lower jigs, just like air holes communicated with the outside are formed in the lower jigs in the upper jigs, vacuumizing operation is further conducted on air in the upper jigs, and then the air tightness of the diaphragm can be detected.