36 results about "Liquid resistor" patented technology

The invention discloses a pilot-operated type water hydraulic pressure digital proportional direction valve, which comprises a main valve and two pilot valves, wherein the pilot valves are positioned on the left side and the right side of the main valve respectively and are arranged on the main valve through an end face in a matching way; each pilot valve comprises a variable liquid resistor and a fixed liquid resistor which is connected in series with the variable liquid resistor; a control port communicated with the end face of a valve core of the main valve is positioned between the variable liquid resistor and the fixed liquid resistor; and the pressure of the control port can be changed by changing the resistance value of the variable liquid resistor so as to control the valve core of the main valve and control the direction and the flow rate of a liquid flow. In the invention, pulse code modulation (PCM) pilot control is adopted, so that the proportional direction valve can be simply and reliably controlled, and has high precision, high frequency and long service life; and the main valve has high flow rate. The pilot valves consist of a switching valve and a damping hole, have low leakage, high pollution resistance and high interference resistance and can be used in a marine environment containing a large number of solid impurities. The valve cores of the pilot valves are driven through piezoelectric ceramics, perform amplification displacement through a compliant mechanism and have simple driving mechanism structures, quick response and long service life.

The invention discloses a pilot-operated type water hydraulic pressure digital proportional direction valve, which comprises a main valve and two pilot valves, wherein the pilot valves are positioned on the left side and the right side of the main valve respectively and are arranged on the main valve through an end face in a matching way; each pilot valve comprises a variable liquid resistor and a fixed liquid resistor which is connected in series with the variable liquid resistor; a control port communicated with the end face of a valve core of the main valve is positioned between the variable liquid resistor and the fixed liquid resistor; and the pressure of the control port can be changed by changing the resistance value of the variable liquid resistor so as to control the valve core of the main valve and control the direction and the flow rate of a liquid flow. In the invention, pulse code modulation (PCM) pilot control is adopted, so that the proportional direction valve can be simply and reliably controlled, and has high precision, high frequency and long service life; and the main valve has high flow rate. The pilot valves consist of a switching valve and a damping hole, have low leakage, high pollution resistance and high interference resistance and can be used in a marine environment containing a large number of solid impurities. The valve cores of the pilot valves are driven through piezoelectric ceramics, perform amplification displacement through a compliant mechanism and have simple driving mechanism structures, quick response and long service life.

The invention provides a conductivity sensor and a manufacture method thereof, relates to a liquid resistor detector and a manufacture method thereof, and aims at providing the conductive senor simple in structure, low in cost and small in size. The conductivity sensor comprises a cylindrical insulating shell, electrodes, insulating blocks and a circuit board, an installation hole is formed in the shell in the axial direction, the insulating blocks and at least two electrodes are arranged in the installation hole separately, corresponding axial through holes are formed in the insulating blocks and the electrodes respectively, the axial through holes are passed through to form a flow channel, an inlet joint and an outlet joint are fixed respectively at the two ends of the shell, channels in the inlet joint and the outlet joint are communicated with the flow channel in the shell, multiple lead holes communicated with the installation hole are formed in the outer wall of the shell, each lead hole corresponds to one electrode, leads are arranged in the lead holes, and the two ends of each lead are connected with the electrode and the circuit board respectively.

The invention is designed for solving the problem of which the liquid resistor currently used in the squirrel cage motor always carries high voltage so as to threaten the human safety. It comprises a cabinet, a liquid resistor tank located on the moving pole plate and the fixed pole plate, a driver mechanism for driving the pole plates to make up and down movement, and a cooling system. The liquid resistor tank is separated by a stick up plate into a liquid resistor chamber and a slack flow chamber. On the upper portion of the liquid resistor chamber, there is a filter layer, and on the upper portion of the slack flow chamber, there is an oil-water separator; the water outlet is connected to the liquid resistor chamber; the oil outlet is connected to the slack flow chamber. The input pipe and outlet pipe all are made of high pressure resistance materials, and are respectively connected to the entrance and the exit of cooling agent. The cooling system uses high pressure resistance cooling agent.

The invention provides a liquid metal based flexible resistance micro heater. The micro heater includes an external flexible base material shell, a liquid metal resistor and lead wires; the external flexible base material shell completely or partially wraps the liquid metal resistor; the shell is provided with a liquid metal resistor flow path and / or air flow path, and the outer surface of the shell is a heating area; the liquid metal resistor is formed by single liquid metal or composite liquid metal; and the composite liquid metal consists of more than two kinds of metal, at least one kind of metal maintains a liquid state at normal temperature, and the metal is single metal or alloy. The liquid metal can be utilized to generate joule heat by being powered on, and the flexibility of themicro heater can be greatly enhanced by the external flexible shell and the liquid metal; through the improvement of the components or structures of the liquid metal, the operating temperature range and service life of the heater can be significantly prolonged; and the micro heater is easy to process and produce in batches, so that the micro heater can be applied to the fields of medical devices,biochemical instruments and high-end manufacturing equipment.

The invention discloses a liquid conductivity detection system. The liquid conductivity detection system comprises an alternating current signal excitation source, a reference resistor, a signal processing unit, a liquid resistor and a signal acquisition unit. The signal acquisition unit is connected with the signal processing unit, and the signal processing unit is further connected with the reference resistor, the liquid resistor and the alternating current signal excitation source. The other end of the liquid resistor is grounded, and the other end of the reference resistor is connected tothe alternating current signal excitation source. The liquid conductivity detection system does not need to detect an effective value of an alternating current signal, thereby simplifying the entire detection process and reducing the hardware cost.

The invention is designed for solving the problem of which the liquid resistor currently used in the squirrel cage motor always carries high voltage so as to threaten the human safety. It comprises a cabinet, a liquid resistor tank located on the moving pole plate and the fixed pole plate, a driver mechanism for driving the pole plates to make up and down movement, and a cooling system. The liquid resistor tank is separated by a stick up plate into a liquid resistor chamber and a slack flow chamber. On the upper portion of the liquid resistor chamber, there is a filter layer, and on the upper portion of the slack flow chamber, there is an oil-water separator; the water outlet is connected to the liquid resistor chamber; the oil outlet is connected to the slack flow chamber. The input pipe and outlet pipe all are made of high pressure resistance materials, and are respectively connected to the entrance and the exit of cooling agent. The cooling system uses high pressure resistance cooling agent.

The invention belongs to the technical field of electrical cabinets, relates to a heat dissipation device for an SYQT intelligent dynamic liquid resistance speed regulator and a using method.An existing liquid resistor generates heat due to the fact that large current passes through the existing liquid resistor, and as a result, the electro-hydraulic temperature rises too high and too fast. The invention just aims to solve the above problem. According to the technical schemes of the invention, a plurality of resistance speed regulation cabinets are arranged; a heat dissipation plate is arranged on the surface of the front side of each resistance speed regulation cabinet; a short-circuit cabinet is arranged on one side of each resistance speed regulation cabinet; a control cabinet is arranged on the other side of each resistance speed regulation cabinet; a cooling tower is connected to the outer side of the top of each resistance speed regulation cabinet; and an alkali liquor storage box is arranged on the surface of the rear side of each resistance speed regulation cabinet. The cooling towers, plate heat exchangers and water pumps are arranged; the plate heat exchangers cool alkali liquor through cooling water; the used cooling water enters the cooling towers through the water pumps, so that the recycling of the cooling water is achieved; the cooling effect of the cooling towers is good, the cooling water is free of loss, and circulating cooling work can be conducted for a long time.

The invention relates to a high-voltage high-power liquid resistor loading device which comprises a liquid resistor box, a moving electrode plate, a fixed electrode plate, a position sensor, a pulling motor, a transmission screw rod, a sliding block and a controller. The device has the main characteristic that the lower ends of the moving electrode plate and the fixed electrode plate are both inserted into a resistance liquid in the liquid resistor box, the fixed electrode plate is fixedly installed, and the moving electrode plate can laterally move. The device adopts a simple transmission mechanism, the distance between the moving electrode plate and the fixed electrode plate is changed under the control of the position sensor and the controller, and the resistance of the liquid resistorcan be conveniently regulated through the change in the distance between the moving electrode plate and the fixed electrode plate; and the requirement on a high-voltage high-power generator or other high-voltage high-power power supply type devices for electrical performance tests can be satisfied. The continuity, the uniformity and the reliability of the high-voltage high-power generator or other high-voltage high-power power supply type devices for electrical performance tests are increased, meanwhile, the investment cost of the resistor loading device is reduced.

The invention discloses a soft start and compensation integrated device, which comprises a main body module, a quick response module, a flow compensation module and an angle change module, and the main body module is used for adjusting the resistance value of a liquid resistor during soft start, and the quick response module is used for quickly adjusting the main body module according to the current change during soft start; the main body module comprises a liquid storage outer box and a liquid storage inner box, the liquid storage inner box is arranged in the liquid storage outer box, the front side and the rear side of the liquid storage inner box are fixedly connected with the inner wall of the liquid storage outer box, a movable pole plate and a fixed pole plate are arranged in the liquid storage inner box, and sliding grooves are formed in the front side and the rear side of the inner wall of the liquid storage inner box; and magnet blocks are fixedly connected to the middle parts of the front and rear sides of the movable pole plate. Through the main body module and the quick response module, the movable pole plate can be rapidly moved, and the control precision is higher.