41results about How to "Stable back pressure" patented technology

The invention aims at providing a slide vane compressor. The problem that backpressure oil supplying of an existing slide vane compressor is not stable is mainly solved. According to the technical scheme, negative pressure is generated in a main oil way in a spindle through a fan, and then an upper oil tube assembly is used for pumping oil from an oil pool; a backpressure oil tank is communicated with the main oil way, and the main oil way supplies pressure oil to the backpressure oil tank. Through the arrangement, oil supplying of the backpressure oil tank is more stable and reliable.

A temperature controlling valve contains a body including a cylindrical chamber, a first opening, a second opening, a first inflow channel, and a second inflow channel; a sleeve member retained in the chamber and including at least one first orifice and second orifice; a first cover to close the first opening; a second cover applied to close the second opening; a valve core fitted into the sleeve member, wherein the first cover includes a first projected portion with a first guide tunnel; the first guide tunnel includes a first axial flowing section and a first longitudinal flowing section; the first projected portion includes a first circular back pressure fence; the second cover includes a second projected portion with a second guide tunnel; the second guide tunnel includes a second axial flowing section and a second longitudinal flowing section; the second projected portion includes a second circular back pressure fence.

The invention discloses a pressure return device for a water plugging profile control physical simulation experiment and a use method of the pressure return device. The pressure return device comprises a pressure sensor and a stop valve, and is characterized by also comprising an intermediate container, pistons, a four-way valve and a high-pressure pulsation-free pump, wherein the intermediate container is internally provided with two pistons, a working liquid is filled in a space between the two pistons, the left side of the intermediate container is connected with an outlet pipe of a core barrel, a space for filling a plugging agent can be formed between the left piston and the intermediate container, and the right piston is connected with a fine tuning hand wheel and a working liquid inlet pipe. Through controlling the pressure of the working liquid between the two pistons, an actual stratum pressure born by a water shutoff profile control agent in a mine field is simulated. The pressure return device has the advantages of simple structure and convenience for use, is easy to dismantle for cleaning and maintaining, and difficult to plug, and has reliable performance to easily maintain the stability of return pressure on the outlet end of the core barrel; return pressure is high to meet the demand of experiments on high return pressure; and an obtained sample is not sheared by a return pressure device.

The invention relates to the technical field of energy storage, and discloses a compressed air energy storage system and an energy storage method. The compressed air energy storage system comprises anair compressor, a heat exchanger, a gas storage, an air expansion, a heat regenerator and a heat accumulator. An air outlet of the air compressor communicates with a gas-phase space of the gas storage through a first heat exchanging pipeline of the heat exchanger, the gas-phase space is further connected with an inlet of the air expansion through a third heat exchanging pipeline of the heat regenerator, a heat storage medium space of the gas storage is connected with an inlet of the heat accumulator through a second heat exchanging pipeline of the heat exchanger, and an outlet of the heat accumulator is connected to the heat storage medium space through a fourth heat exchanging pipeline of the heat regenerator. According to the energy storage method of the energy storage system, energy-releasing storage is combined with a heat energy storage system, the gas storage, the heat exchanger, the heat accumulator and the heat regenerator are used for forming a heat regenerative cycle, internal heat balance and pressure balance of the compressed air energy storage system can be simultaneously realized, and the conditions of variable backpressure operation of the air compressor becoming and sliding pressure operation of the air expansion are avoided.

The invention discloses a constant air volume control method and system for a public flue in a building. The constant air volume control system includes a cloud server, a data acquisition module and a cellular communication module; the data acquisition module is used to obtain the actual air volume data of an indoor range hood The cloud server is used to calculate the target air volume data of the indoor range hood according to the working status data and send it to the cellular communication module to be sent to the data acquisition module; the data acquisition module is used to adjust the corresponding indoor air volume data according to the actual air volume data and the target air volume data. The working status of the range hood. In the present invention, a CAT1 module is used to form a control system with a cloud server as the center, so that the communication delay is low and the communication performance is stable; the operating state of the range hood on the upper and lower floors is automatically adjusted according to the operating rate of the range hood and the resistance of the flue to realize Constant air volume operation avoids the occurrence of oil fume backflow.

The application provides a pump body assembly, a compressor and an air conditioner. The pump body assembly includes a main shaft, an upper flange, a lower flange, a cylinder and rollers. The rollers are fixed circumferentially relative to the main shaft. A slide groove is arranged on the roller, and a slide is provided for sliding in the slide groove. The head of the cylinder abuts against the inner wall of the cylinder, a tail cavity is formed between the tail of the slide vane and the tail of the slide vane groove, the upper flange is provided with a first back pressure groove and / or the lower flange is provided with a second back pressure The main shaft is provided with a central hole and a side hole, and the tail cavity communicates with the side hole through the back pressure groove. In the section perpendicular to the central axis of the main shaft, each tail cavity is correspondingly provided with at least one side hole, and the tail cavity is located at the On the extension line of the center line of the side hole corresponding to the tail cavity. According to the pump body assembly of the present application, it can solve the problem that when the existing compressor is running at medium and low frequencies, the back pressure of the sliding vane is insufficient due to untimely oil supply, and the head of the sliding vane is separated from the inner wall of the cylinder, resulting in leakage and affecting the compressor. Issues of energy efficiency and reliability.

A scroll compressor in which timing of communication between a high-pressure region and a back pressure chamber and timing of communication between the back pressure chamber and a compression chamber are controlled to prevent excessive back pressure, allowing application of stable back pressure. As a result, the scroll compressor has high efficiency and high reliability. The scroll compressor has a first route (54) for intermittently interconnecting a high-pressure region (30) and a back pressure chamber (29), and also has a second route (55) for intermittently interconnecting the back pressure chamber (29) and a compression chamber (15).

The invention relates to a fuel supply maintaining valve. The maintaining valve comprises a shell and an oil return base. The maintaining valve is characterized in that an oil atomizer oil return endconnector and a pressure gauge end connector are arranged on the shell, the oil atomizer oil return end connector and the pressure gauge end connector both communicate with an inner cavity of the shell, an oil supplementing spring is arranged in the inner cavity of the shell, and a sealing valve is installed in the oil supplementing spring; the oil return base is provided with a middle hole, an adjusting valve is arranged in the middle hole of the oil return base, an oil return spring and a hole plate are installed at the upper end of the adjusting valve, and an adjusting rod is arranged at the bottom of the adjusting valve; the lower end of the shell is screwed and assembled with the upper end of the oil return base, and the lower end of the sealing valve of the inner cavity of the shellis in contact with the hole plate located at the upper end of the middle hole of the oil return base so as to realize sealing; and an oil tank end connector is arranged on the oil return base, and theoil tank end connector communicates with the middle hole of the oil return base. According to the fuel supply maintaining valve, the bidirectional pressure maintaining can be realized, oil return back pressure can be kept, furthermore, oil supplementing operation of an amplifying piston cavity can be realized, and working efficiency and system stability are greatly improved.

The invention discloses a performance test device and a performance test method for a seawater hydraulic motor under a deep-sea high-back-pressure environment. The performance test device mainly comprises a seawater hydraulic motor test system, a monitoring control system, a deep-sea simulation cabin, a pressure loading system and a circulating water cooling system, wherein the deep-sea simulation cabin provides back pressure required to bear while working under different water-depth environments for performance test of the tested seawater hydraulic motor by virtue of the pressure loading system; test load of the tested seawater hydraulic motor is freely regulated by virtue of a high-pressure flow control valve mounted in the circulating water cooling pipeline; and the circulating water cooling pipeline can effectively avoid rising the water temperature in the cabin due to heat generated by the seawater hydraulic motor operated under load, the motor and the like. The method can simulate the back pressure environment at a set ocean depth and can realize performance test for the seawater hydraulic motor, is simple to operate, easy to realize, not only overcomes the technical difficulty of lowering the seawater hydraulic motor into great-depth deep sea, but also can accurately obtain performance parameters of the seawater hydraulic motor.