41results about How to "Remove freeze" patented technology

An apparatus and a method for a walking aid are disclosed. The walking aid includes a walker having a frame con- figured to extend about a user of the walker to at least partially support the user and to facilitate the user progressing along a path from a current step to a next step while at least partially supported by the walker. A swivel mount is supported by the frame. A light source is connected to the swivel mount. The light source is configured to project a visual cue on a projection surface in the path between the current step and the next step to trigger the next step by the user. A controller is configured to adjust a visual property of the visual cue for use under indoor conditions and outdoor conditions.

The present invention provides a system, method and apparatus for controlling a gas-fired heater connected to a fuel source via a fuel source valve that includes one or more power sources, a temperature sensor, a pilotless igniter disposed within the gas-fired heater, a flame sensor disposed within the gas-fired heater and a controller electrically connected to the one or more power sources, the temperature sensor, the pilotless igniter, the flame sensor and the fuel source valve. The controller turns the pilotless igniter on for a first time period and opens the fuel source valve whenever the temperature sensor indicates that a temperature is less than or equal to a low temperature setting. The controller also closes the fuel source valve whenever the temperature sensor indicates that the temperature is greater than or equal to a high temperature setting or the flame sensor indicates that a flame has gone out.

The invention discloses a urea injection system for reducing the NOx discharge of an engine. The urea injection system mainly comprises a urea supply unit, an injection unit, an unfreezing unit and a control unit. The urea supply unit comprises a urea unidirectional flow pump, a secondary filter, a first electromagnetic valve and a gas liquid mixer which are sequentially connected with a urea tank by a first pipeline; and a spray nozzle part in the injection unit is used for spraying the gas liquid mixture into an exhaust pipeline communicated with the upstream of an SCR (Selective Catalytic Reduction) catalyst; according to the system disclosed by the invention, urea is sucked out of the urea tank and a certain pressure is formed, the injection quantity of the urea is automatically regulated according to the operation working condition of the engine, and the urea is sprayed into the exhaust pipe of the engine after the urea is atomized by high pressure air so as to react with NOx discharged from the engine on the SCR catalyst, and thus, the aim of reducing the NOx discharge is fulfilled; and the control unit is communicated with an engine controller to coordinate the normal work of the integral system and monitor the working conditions of the system and the parts.

The invention discloses a spinning assembly and a spinning part. The spinning assembly is used for producing polyurethane fibers and comprises a metering device and the spinning part, wherein the metering device is provided with one inlet and a plurality of outlets, the inlet is connected with a filtering and pressure stabilizing device, the outlets are directly connected with the spinning part, the spinning part is a box body with a cavity, the box body is internally provided with holes of different numbers, the number of the holes corresponds to the number of the polyurethane fibers in each spinning station, a filter and a spinneret are arranged inside each hole, the outlets of the metering device are correspondingly connected onto the holes of the spinning part, and the centers of the outlets of the metering device and the centers of the holes of the spinning part are homocentric. According to the invention, the production quality of the polyurethane fibers can be increased, the production efficiency can be increased, and the spinning assembly and the spinning part are simple and rapid to install and maintain.

A blow-by gas recirculation apparatus which can release freezing of a PCV valve in a short period of time is obtained with a simple configuration. The blow-by gas recirculation apparatus is provided with the PCV valve at a case member of a gas space portion to which blow-by gas is sent in a manner that the PCV valve penetrates through the case member and a return path supplying the blow-by the gas, which is from the PCV valve, to an induction system of an engine. A heating portion to which part of oil lubricating the engine is supplied and thus which heats the PCV valve with heat of the oil is formed.

The invention provides a method for preparing polyacrylonitrile-based carbon fiber precursors without a skin-core structure and belongs to the technical field of carbon fiber precursors. The method comprises the followings steps of: evenly mixing water or alcohol compounds and an organic solvent, adding polyacrylonitrile resin in the mixed solution, performing the heated swelling dissolution treatment, and filtering the mixed solution to obtain polyacrylonitrile spinning solution; and ageing the polyacrylonitrile spinning solution, performing spraying and extrusion to obtain primary precursors, and performing water-washing stretching, second-level hot water stretching, drying densification and saturated steam stretching of the primary precursors in sequence to obtain the polyacrylonitrile-based carbon fiber precursors. By the method, the good-quality polyacrylonitrile-based carbon fiber precursors having the advantages of no skin-core structure, less defects, small fiber number and high strength can be mass produced in large scale in the conventional industrialized spinning equipment, and the production cost can be effectively lowered.

The invention provides an LNG air-conditioning refrigeration system. The LNG air-conditioning refrigeration system comprises an LNG storage tank, a three-medium high temperature difference heat exchanger, an air-conditioning refrigeration unit and a control unit; the LNG storage tank is used for storing LNG; the three-medium high-temperature difference heat exchanger comprises a shell, an upper heat exchanger and a lower heat exchanger; a containing cavity is arranged in the shell; a cold storage agent with gas-liquid conversion characteristics is arranged in the containing cavity; the cold storage agent comprises a gas-phase cold storage agent in a gaseous state and a liquid-phase cold storage agent in a liquid state; the air conditioning refrigeration unit comprises a fan coil heat exchange unit and a circulating pump; the lower heat exchanger, a coil heat exchanger and the circulating pump communicate through pipelines; a secondary refrigerant is arranged in the pipelines of the airconditioning refrigeration unit; the fan coil heat exchange unit comprises a fan and the coil heat exchanger; the fan is positioned on one side of the coil heat exchanger; and the control unit is incontrol connection with the circulating pump and the fan. According to the LNG air-conditioning refrigeration system, a three-medium heat exchange scheme is adopted, the problems of secondary refrigerant freezing and poor heat exchange during double-medium heat exchange are solved, and a function of a cold storage air conditioner is also provided.

The present disclosure relates to systems and methods for separation of sulfurous material(s) from a multi-component feed stream. The systems and methods can comprise contacting the multi-component feed stream with a solvent in a contacting column so that at least a portion of the sulfurous material(s) is transferred from the multi-component feed stream to the solvent. A stream of a substantially purified gas can thus be provided along with a liquid stream comprising at least a majority of the sulfurous material. In particular, the solvent can comprise liquid carbon dioxide, which can be particularly beneficial for removing sulfurous materials from multi-component feed streams.

The invention relates to a split transmission line deicer comprising a main box (2), a deicing mechanism (3), a control and monitoring device (4) and a driver. The deicing mechanism (3) is installed on the upper and lower surfaces of the main box (2). The control and monitoring device (4) and the driver (5) are installed on the upper surface of the main box (2). The deicing mechanism (3) consistsof an ice breaking mechanism and an ice cutting mechanism. Through multiple times of deicing, thorough deicing is ensured. The split transmission line deicer has good adaptability, high reliability and a simple structure, can greatly reduce the cost of transmission lines, is suitable for deicing long-distance transmission lines in complex field environments, and greatly reduces the work intensityof power grid workers. Moreover, through slight improvement, the split transmission line deicer can meet the deicing requirements of different split transmission lines. The split transmission line deicer is of high application value.

The invention discloses an intelligent eddy-current heating cable for a high speed railway track. The intelligent eddy-current heating cable for the high speed railway track comprises the high speed railway track, a heat conducting bridge, a heat conducting bar, a heating tube, a mounting fixing frame, a protective tube and an electromagnetic induction heating cable; the heat conducting bridge ismounted on the sleeper side of the high speed railway track; the heat conducting bar is connected between the heat conducting bridge and the surface of the sleeper side of the high speed railway track; the heating tube is arranged in an arc opening in one side of the heat conducting bridge; the protective tube is arranged on the periphery of the heating tube; and the electromagnetic induction heating cable is mounted in the protective tube. The intelligent eddy-current heating cable for the high speed railway track has the advantages that the electromagnetic induction heating cable is suppliedwith power by using a single power supply to generate heat and the heat is transmitted to the high speed railway track via the heat conducting bridge and the heat conducting bar because the heating tube, the heat conducting bridge and the heat conducting bar are arranged and the electromagnetic induction heating cable is mounted in the heating tube; and therefore, accumulated snow and ice on therailway track can be rapidly and conveniently eliminated to enhance the safety of a high speed train during running in winters.

The invention discloses a refrigerant piping device being a device located in a low-temperature freezing state and capable of performing a high-speed reciprocating motion. The refrigerant piping device comprises a freezing head, an input unit communicated with the freezing head for inputting a refrigerant, and an output unit communicated with the freezing head for outputting the refrigerant. The output unit includes a refrigerant reflux pipe communicated with the freezing head, and a heating module arranged on the refrigerant reflux pipe for heating the refrigerant in the refrigerant reflux pipe. The refrigerant reflux pipe is provided with a heating module for heating the refrigerant in the heating pipe; and the freezing state of the refrigerant reflux pipe can be eliminated by dint of the heating effect to recover flexible functions and effects of the refrigerant reflux pipe, so that the freezing embrittlement state of the refrigerant reflux pipe due to low temperature can be prevented, and the breakage of the freezing head due to left-right, front-back or up-down high-speed reciprocating actions can be prevented.

The present invention relates to a splitting transmission line deicing machine with a detection stump-jump function. The splitting transmission line deicing machine comprises a main box body (2), deicing mechanisms (3), a control and monitoring device (4) and a driver. The deicing mechanisms (3) are installed at upper and lower surfaces of the main box body (2), and the control and monitoring device (4) and the driver (5) are installed at the upper surface of the main box body (2); and the deicing mechanisms (3) comprise an ice beating mechanism and an ice cutting mechanism. Through multi-timedeicing, the deicing thoroughness is ensured, through detection by a detection device, it is determined whether there is an interval bar or not, so that the operation of the deicing mechanism is controlled, the adaptability is good, the reliability is high, the structure is simple, the cost of the power transmission line is greatly reduced, the splitting transmission line deicing machine is suitable for field complex environments and long-distance transmission line deicing work, and working intensity of power grid workers are greatly improved; and moreover, the splitting transmission deicingmachine is slightly improved to adapt deicing requirements of different splitting transmission lines, and the application value is large.

The invention belongs to the technical field of air conditioners and particularly relates to an indoor unit anti-freezing control method for an air conditioner. The invention aims at solving the problem that when an existing air conditioner judges the indoor unit freezing condition, the accuracy is low. In order to solve the problem, the indoor unit anti-freezing control method for the air conditioner comprises the steps that when the air conditioner is in a refrigeration working condition, according to the temperature of an indoor coil pipe, the attenuation degree of an overall machine poweraverage value in a second time period relative to an overall machine power average value in a first time period and the attenuation degree of an overall machine current at a second preset moment in the second time period relative to an overall machine current at a first preset moment in the first time period, whether or not the air conditioner is enabled to enter an indoor unit anti-freezing modeis judged. The first time period is located before the second time period, so that the influence of various unrelated factors on the accuracy of a judgement result is effectively reduced, the judgement accuracy is effectively improved, and accordingly it is effectively guaranteed that the air conditioner can quickly and accurately enter the indoor unit anti-freezing mode.

A heat exchanging ventilation device includes supply air blower (8); exhaust air blower (9); a supply air blowing passage through which air to be delivered to indoor from outdoor by supply air blower (8) passes; a exhaust air blowing passage through which air to be delivered to the outdoor from the indoor by the exhaust air blower passes; heat exchange element (11) disposed at a position where both the supply air blowing passage and the exhaust air blowing passage pass and exchanging heat between air delivered by supply air blower (8) and air delivered by exhaust air blower (9); supply air damper (12) provided on supply air inlet (2) side of the supply air blowing passage; exhaust air damper (13) provided on exhaust air outlet (3) side of the exhaust air blowing passage; and circulation damper (14) provided at boundary portion (25) which separates the supply air blowing passage and the exhaust air blowing passage from each other.

The invention provides a water injection control system and a water injection control method, so that a water station can supply water for a water station with a water supply system failure in winter.The water injection control system structurally comprises a water filtering device, a sterilizing device and a water purification box which are sequentially connected in series through water supply pipelines; and the water purification box is provided with a water supply connector required for connecting with a pipeline of a water supply tank of a water station. The water injection control systemalso comprises a controller and an anti-freezing water injection pipeline; a water outlet of the anti-freezing water injection pipeline is connected with a water inlet of the water filtering device;the anti-freezing water injection pipeline comprises a first water injection solenoid valve, a tee joint and a second water injection solenoid valve which are sequentially connected in series throughpipelines; a first connector and a second connector of the tee joint are correspondingly connected with the first water injection solenoid valve and the second water injection solenoid valve; a thirdconnector of the tee joint is connected with a water discharge electromagnetic valve; and the first water injection solenoid valve, the second water injection solenoid valve and the water discharge solenoid valve are correspondingly electrically connected with the controller. The water injection pipeline is not prone to freezing in winter.

A fuel cell system includes a fuel cell a temperature acquisition unit that acquires a temperature of the fuel cell, a cell unit voltage sensor that detects a voltage of each of fuel cell units, and a controller that controls the fuel cell system. The controller restricts an output current of the fuel cell when the voltage of the individual fuel cell unit becomes equal to or lower than a predetermined value in a warm-up operation, execute the warm-up operation when the temperature of the fuel cell is equal to or lower than a predetermined temperature, after the fuel cell system receives a start-up request, and stop an operation of the fuel cell system when a stop condition including that the voltage of the fuel cell unit is continuously equal to or lower than a predetermined voltage value for a predetermined time is satisfied after start of the warm-up operation.

The invention provides a water taking control system, which is convenient for a water station to normally and continuously supply water to a water taking vehicle in winter, and structurally comprisesa purified water tank, a sterilization device, a water injection pump, a water filtering device and a water taking flow meter which are sequentially connected in series through a water supply pipeline, wherein the purified water tank is provided with a water supply interface required for being connected with a water supply tank pipeline of a water station, the system further comprises a controllerand an anti-freezing water taking pipeline, the water inlet of the anti-freezing water taking pipeline is connected with the water taking flow meter, the anti-freezing water taking pipeline comprisesa first water taking electromagnetic valve, a tee joint and a second water taking electromagnetic valve which are sequentially connected in series through a pipeline, the first interface and a secondinterface of the tee joint are used for being connected with the first water taking electromagnetic valve and the second water taking electromagnetic valve correspondingly, the third interface of thetee joint is connected with a water drainage electromagnetic valve, and the water injection pump, the water taking flow meter, the first water taking electromagnetic valve, the second water taking electromagnetic valve and the water drainage electromagnetic valve are electrically connected with the controller. According to the invention, the water taking amount is accurate and controllable, anda water taking pipeline is not prone to freezing in winter.