4results about How to "Reduce inflation pressure" patented technology

The frost crack prevention water mixer comprises a water mixing channel shell and a frost crack prevention mechanism, the water mixing channel shell is provided with a cold water inlet, a hot water inlet, a water mixing cavity, a pressure relief opening and a plurality of water outlets, and the cold water inlet, the hot water inlet, the pressure relief opening and the water outlets are all communicated with the water mixing cavity; the frost crack prevention mechanism comprises a fixing block, a diaphragm and an elastic piece, the fixing block and the diaphragm are fixedly connected to the pressure relief opening, the diaphragm seals the pressure relief opening, one end of the elastic piece abuts against the fixing block, the other end of the elastic piece is fixedly connected with a cushion block, and the elastic piece is used for driving the cushion block to move in the direction away from the fixing block so that the cushion block can abut against the diaphragm. According to the frost crack prevention water mixer, the expansion volume of ice can be absorbed, and the possibility that the water mixing channel shell and the valve are cracked and damaged is reduced.

This invention discloses a load-bearing, tilting air cushion stretcher, comprising upper and lower airtight layers, a sandwich load-bearing structure formed by a vertical traction wire array, and a load-bearing area formed by inflation. The head and foot ends of the air cushion stretcher are provided with rigid end inserts encapsulated between the airtight layers. Inside the weld seam, a reinforcing band fixing area, an end force-bearing connection, a non-inflatable main load-bearing strap, an end-densified vertical traction wire array, and a density-gradient transition area are sequentially arranged to form an end load-bearing band. The load input from the end force-bearing connection is transferred to the load-bearing area via the end load-bearing band, bypassing the airtight weld seam area. In some embodiments, the air cushion stretcher is provided with an edge-stabilizing air chamber and a secondary load-bearing limiting band to assist in providing end posture constraints and end displacement restrictions under abnormal working conditions during tilting.

This utility model discloses a three-plug, three-injection sealing device for coal seam gas depressurization and extraction technology, comprising an outer bag, a middle bag, an inner bag, and a gas hole. The outer bag, middle bag, and inner bag are disposed inside the gas hole. A rear sealing section is provided between the outer bag and the middle bag, and a front sealing section is provided between the middle bag and the inner bag. A grouting pipe is disposed on the outer bag, with its right end passing through the middle bag and the inner bag. A grouting pipe is disposed in the middle of the outer bag, with its right end passing through the middle bag. A grouting pipe is disposed at the lower part of the outer bag, with its right end extending into the rear sealing section. An extraction pipe is disposed on the upper part of the outer bag. The multiple-section sealing and grouting reduces the risk of slurry loss and improves the reliability of the sealing. The filter tail filters the slurry in the middle section, filtering out the water in the slurry and leaving solid expansion material, thus preventing slurry leakage during the grouting process.

The utility model discloses a frost crack prevention water mixer which comprises an outer shell, a water mixing channel shell and a frost crack prevention mechanism, the water mixing channel shell is arranged in the outer shell, the water mixing channel shell is provided with a cold water inlet, a hot water inlet, a water mixing cavity and a plurality of water outlets, and the cold water inlet and the hot water inlet are arranged on the same side of the water mixing channel shell. The cold water inlet, the hot water inlet and the plurality of water outlets are all communicated with the water mixing cavity; the frost crack prevention mechanism comprises a heat preservation part which is arranged between the shell and the water mixing channel shell, and the heat preservation part wraps at least one part of the cold water inlet, the hot water inlet and the water mixing channel shell. According to the frost crack prevention water mixer, the freezing sequence of water in different areas in the water mixing channel shell can be guided through local heat preservation, the water inlet end is finally frozen, pressure caused by freezing expansion is buffered, and the possibility that the water mixing channel shell and the valve are cracked and damaged is reduced.