36results about How to "Reduce leakage area" patented technology

Provided is a combined piston ring having an excellent gas seal characteristic and comprising a special gap effective for countermeasures against blow-by, wherein a combustion chamber-side side surface is not locally deformed nor melted even when receiving combustion gas from the combustion chamber side. To this end, a combined piston ring comprises a piston ring body which is produced from a high-strength heat-resistant resin and has a gap part having a step shape when viewed from the upper and lower surfaces and the outer peripheral surface, and a spring which is mounted to the inner peripheral part of the piston ring body and presses the piston ring body radially outward, and the combustion chamber-side side surface of at least the piston ring body is coated with a heat-resistant film.

The invention discloses an internal injection replacement support room type coal pillar recovery method. In the process of room type coal pillar recovery, room type coal pillars with an aspect ratio greater than 0.6 are divided into reserved coal pillars and pre-mining coal pillars, after the mining of the pre-mining coal pillars, cement filling materials are injected into goafs surrounded by thereserved coal pillars, after the goafs are stabilized, the coal pillars are replaced with the goafs for supporting, and the reserved coal pillars are recovered; and based on the Winkel beam theory, amechanical model of the reserved coal pillars in the stage of supporting overlying strata is established, and the displacement and force conditions of roofs of the reserved coal pillars in the supportstage are obtained. According to the first strength theory of the roofs and the criterion of the ultimate strength of the reserved coal pillars, the theoretical setting width of the reserved coal pillars is obtained. The internal injection replacement support room type coal pillar recovery method can not only efficiently recover valuable coal resources and reduce waste of the coal resources, butalso can effectively support the overlying strata and prevent a series of mine safety problems.

The invention provides a fiber enhanced type wet paving / pre-paving waterproof coil material and a special construction method of the fiber enhanced type wet paving / pre-paving waterproof coil material for water prevention of an underground engineering bottom plate. The waterproof coil material comprises a fiber enhancing layer, an upper adhesive layer, a tread layer, a lower adhesive layer and an isolating membrane. The construction method comprises the following steps: (1) constructing a concrete cushion layer of the underground engineering bottom plate; (2) wetly paving a fiber enhanced type wet paving / pre-paving waterproof coil material; and (3) bundling bottom plate structure steel bars on the fiber enhancing layer and pouring bottom plate structure concrete. According to the fiber enhanced type wet paving / pre-paving waterproof coil material and the construction method, wet paving and pre-paving construction manners in a waterproof coil material construction process are combined together; a waterproof structure is simple, and waterproof and safe dual guarantees are realized; and the probability of water leakage is effectively reduced.

The present invention provides a control circuit for a display panel, a driving method of a display panel, and a display device. The control circuit for the display panel is used for controlling the display panel, wherein the display panel includes shielding electrodes, gate lines and a gate driving circuit, wherein corresponding shielding electrodes are arranged above a row of gate lines and are used for blocking the gate lines; the control circuit for the display panel includes a shielding electrode control unit; the shielding electrodes are connected with a common electrode through the shielding electrode control unit; and the shielding electrode control unit is used for controlling the corresponding the shielding electrodes to be in floating states when the gate lines are switched on. With the control circuit of the invention adopted, time required by the gate signals lines to perform charging and discharging can be effectively decreased, and the charging time of pixels can be ensured, electric leakage areas can be reduced, and the high-aperture ratio frame of the pixels can be ensured.

The invention relates to a novel heat preservation system of a heat preservation tank car. The novel heat preservation system comprises a tank body heat preservation structure camped between an innertank body and an outer tank body, and a secondary heat preservation structure connected with the tank body heat preservation structure. The novel heat preservation system is technically characterizedin that the secondary heat preservation structure is composed of a tank body end socket secondary heat preservation structure, a tank body V-shaped beam secondary heat preservation structure, a tank body traction disc secondary heat preservation structure and a tank body heat insulation structure located on a tank body metal connector. The novel heat preservation system effectively solves the problem that heat is leaked out of a tank body of an existing heat preservation tank car, heat conduction is effectively blocked, the heat leakage rate is reduced, and therefore the heat preservation effect of the tank body is guaranteed. Meanwhile, on the premise of guaranteeing the heat preservation effect, the weight of the tank body end socket heat preservation structure is reduced, the productiondifficulty is reduced, and production cost is reduced.

The present invention provides a composite durable antistatic non-asphalt-based self-adhesive gas insulation board and its preparation method, which solves the problem that the gas insulation board in the prior art is a hard plastic board due to long-term high and low temperature changes in the use environment. It has the phenomenon of dimensional change, which leads to the technical problem of gas leakage. It includes a polymer waterproof board layer, a self-adhesive material layer and a polyurethane coating layer; the polymer waterproof board layer is the bottom layer, the self-adhesive material layer is covered on the polymer waterproof board layer, and the polyurethane The paint layer is the surface layer. The invention forms a composite weather-resistant and antistatic non-asphalt-based self-adhesive gas isolation board for gas tunnels through the compounding of polymer waterproof board layer, self-adhesive rubber material layer and polyurethane coating layer, thereby effectively preparing an excellent Mechanical properties, good flexibility, weather resistance, excellent gas insulation performance, excellent flame retardancy and antistatic properties, and easy construction and transportation of gas insulation panels.

The invention relates to a stroke differential type high-energy hydraulic drive down-hole hammer. A spline on a drill bit is in sliding fit with a spline groove, a valve cover sleeve is in interference fit with a valve sleeve to be installed into the upper end of the valve sleeve. A valve cover is inserted into a cylinder body upper end hole and is radially provided with low-pressure emptying channels, hole channels corresponding to the radial channels are radially formed in the radial direction of a cylinder body and are communicated with axial hole channels. The upper portion of the high-energy hydraulic drive down-hole hammer is in threaded connection with an outer cylinder through an upper connector and a middle connector respectively to form a whole through package. The axial size of a piston of the hammer is small, matching surfaces are few, the leakage area is greatly decreased, and the hammer is easy to assemble, not prone to abrasion, long in service life and high in sensitivity. A differential loop is adopted for a stroke, so that the piston quickly obtains large impact end speed within a shorter stroke, and the hard rock drilling efficiency is remarkably improved. The hammer is provided with a novel empty hammering preventing mechanism, high-pressure slurry flows into a cavity through the channels and then flows into the bottom of a hole, the hammer is not driven, it is ensured that the down-hole hammer does not work when a drilling tool is lifted to be away from the down-hole hammer, and accordingly the safety of the drilling tool is ensured.

The invention is a smoke insulating damper-throttle relating to a insulating block used for smoke switch and insulation in smoke desulphurizing system, it can realize insulation to smoke with simple and reliable structure, the throttle includes a valve of a closed structure valve board with a sealed cavity, a middle media control switching valve, a electric executing mechanism; the electric executing mechanism, the middle media control switching valve are at two sides of the valve, the self-closed structure valve board with sealed cavity is in the valve, one end is connected to the outer electric executing mechanism, another end is connected to the outer middle media control switching valve, the middle media control switching valve and the hollow part of the self-closed structure valve board are connected; the valve board can be driven by the electric executing mechanism to rotate 90 degrees, at the same time, it drives the middle media control switch valve to rotate 90 degrees. It integrates the middle media control switch system and the valve board control, it guarantees the safety and reliability of the seal.