530 results about "Isolation valve" patented technology

The invention relates to the technical field of generator set mixed bed operation monitoring, and discloses a fine processing mixed bed failure situation situation sensing system and method, the sensing system comprises a sampling tube, a sampling electric valve, a sampling isolation valve, a cation resin column, a conductivity meter, a mixed bed failure monitoring device and a resin regeneration system; the sampling pipe extends into the central axis of the fine treatment mixed bed; a plurality of sampling pipes are arranged along the height direction of the fine treatment mixed bed, are sequentially connected with a sampling electric valve and a sampling isolation valve, and then are connected in series to one end of a cation resin column; the other end of the cation resin column is connected with the conductivity meter; the mixed bed failure monitoring device is electrically connected with the sampling electric valve, the sampling isolation valve and the conductivity meter; and the resin regeneration system is connected with a water inlet pipeline and a water outlet pipeline of the fine treatment mixed bed through a fine treatment mixed bed resin inlet valve and a fine treatment mixed bed resin outlet valve respectively. Situation awareness of mixed bed failure is achieved by establishing a layered monitoring system, and long-term stability of water quality of a water vapor system of a power plant is guaranteed.

The invention discloses a vacuum cavity pressure maintaining test and leak rate rapid estimation method and system, and the method comprises the steps: achieving the test preparation of multiple sections through a public metering manifold and a multi-way isolation valve, and building a section volume database; the pressure and temperature data are synchronously collected in a fixed sampling period by exhausting air to preset pressure and isolating a pump end; obtaining an equivalent pressure change rate through temperature normalization and deflation baseline deduction in combination with filtering and regression algorithms, and performing conversion to obtain a standardized leak rate; step-by-step detection is carried out on each functional section of the cavity through a segmented bipartite isolation strategy and volume correction, and rapid positioning of a suspicious leakage section is realized; through double-threshold determination of an early warning threshold and an unqualified threshold, a detection report is automatically generated and written into a historical database, and a detection-determination-maintenance closed loop is formed. The method can improve the precision of leak rate detection, and is suitable for vacuum coating equipment, semiconductor process equipment and industrial vacuum treatment devices.

The invention relates to the technical field of generator set mixed bed operation monitoring, and discloses an operation health degree monitoring method and system based on fine treatment mixed bed resin tracking, the monitoring system comprises a sampling tube, a sampling electric valve, a sampling isolation valve, a cation resin column, a conductivity meter, a mixed bed failure monitoring device and a resin regeneration system; the sampling pipe extends into the central axis of the fine treatment mixed bed; a plurality of sampling pipes are arranged along the height direction of the fine treatment mixed bed, are sequentially connected with a sampling electric valve and a sampling isolation valve, and then are connected in series to one end of a cation resin column; the other end of the cation resin column is connected with the conductivity meter; the mixed bed failure monitoring device is electrically connected with the sampling electric valve, the sampling isolation valve and the conductivity meter; and the resin regeneration system is connected with a water inlet pipeline and a water outlet pipeline of the fine treatment mixed bed through a fine treatment mixed bed resin inlet valve and a fine treatment mixed bed resin outlet valve respectively. Health degree monitoring is realized by establishing a layered monitoring system, and long-term stability of water quality of a power plant system is guaranteed.

The utility model belongs to the technical field of valve detection, and discloses a valve tightness detection device, which comprises a moving trolley, a clamping mechanism, a storage tank, an adjusting assembly and a pressure gauge, the clamping mechanism is arranged on the moving trolley and used for fixing a detected valve, the storage tank is arranged on the moving trolley and used for fixing the detected valve, and the adjusting assembly is used for adjusting the pressure gauge. The movable trolley can freely move in a workshop, so that the detection device can move to the side of a detected valve without long-distance carrying, the input end of the adjusting valve is communicated with the storage tank, the output end of the adjusting valve is communicated with the input end of the isolating valve, and the output end of the isolating valve is communicated with the detected valve. The measuring port of the pressure gauge is communicated between the isolating valve and the tested valve, the pressure gauge is used for measuring the pressure drop of the tested valve, before the valve is installed to the process pipeline, the valve tightness detection device is used for testing the leakage rate of the tested valve in an off-line state, the tested valve is installed after meeting the requirement, rework is reduced, and the work efficiency is improved.

A flow control arrangement is provided including a housing seating inlet and outlet conduits is provided. An isolation valve is arranged within the housing and is fluidly coupled to the inlet conduit. A first flow switch with a first shutoff trigger is arranged within the housing and fluidly couples the isolation valve to the outlet conduit. A second flow switch with a second shutoff trigger is arranged outside of the housing and is fluidly separated from the first flow switch. A controller operably connects the first and second flow switches to the isolation valve to close the isolation valve when (a) flow rate of a first fluid traversing the first flow switch is greater than the first shutoff trigger, or (b) flow rate of a second fluid traversing the second flow switch is less than the second shutoff trigger. Semiconductor processing systems and flow control methods are also described.

The invention discloses a redundancy control device and system for a valve actuating mechanism of a pneumatic isolating valve, and belongs to the technical field of industrial automation and process control. The device comprises a triple gas source supply system which comprises a main gas source, a standby gas source A and a standby gas source B adopting a high-pressure gas storage tank; the distributed intelligent control module comprises a main controller, a hot standby controller and a cold standby controller and adopts a 2oo3 voting mechanism; the triple modular execution mechanism system comprises an electro-pneumatic execution unit, a pure pneumatic execution unit and a mechanical standby execution unit; the invention discloses a self-adaptive fault diagnosis and recovery system. The control system comprises an intelligent self-learning system, an undisturbed switching control system and the like, and has a layered software architecture and a multi-level control strategy. Multiple redundancy is achieved, the reliability of extreme conditions is improved, fault prediction is accurate, response is fast, switching disturbance is small, the method adapts to working condition changes, and the safety and the intelligent level of the system are improved.

The invention discloses a combinable multi-way valve adopting a double-valve-element structure, and relates to the technical field of new energy automobile heat pump heat management systems, the combinable multi-way valve comprises a valve body, a first valve element, a second valve element, a valve element driving unit and a plurality of water pipe connectors; according to the combinable multi-way valve adopting the double-valve-element structure, the two independent valve cavities are formed in the single valve body, and the first valve element and the second valve element which are controlled by the valve element driving unit through a synchronous and asynchronous gear system are arranged; through cooperation of a middle sealing ring used for isolating a valve cavity and a connector sealing ring used for guaranteeing external sealing, cooperative and non-cooperative accurate rotation control over the two cylindrical valve elements can be achieved through a single motor driving system, and therefore the purpose that the two cylindrical valve elements can be accurately rotated and controlled on the premise that reliable sealing and independent action of the valve elements are guaranteed is achieved. The complexity of a mechanical structure and an electric control system controlled by multiple channels is remarkably simplified, and a solid structural foundation is laid for further realizing multifunctional integration.

A method includes opening a flow path from a gas stick through a variable orifice, a chamber, and an outlet isolation valve of the chamber. The method further includes causing a gas to flow through the flow path at a flow rate setpoint. The method further includes actuating an opening of the variable orifice to establish a choked pressure regime within the chamber, the choked pressure regime being achieved by causing a first pressure upstream of the variable orifice to be at least two times a second pressure downstream of the variable orifice. The method further includes closing the outlet isolation valve to cause the chamber to be filled with the gas from the gas stick. The method further includes measuring a pressure rate-of-rise within the chamber. The method further includes determining one or more flow measurements based at least in part on the pressure rate-of-rise.

The invention relates to the technical field of monocrystalline silicon manufacturing, in particular to a method for reducing crystal pulling power consumption of a single crystal furnace, which comprises the following steps: filling a cavity of the single crystal furnace with oxygen; an evacuating device at the bottom of the single crystal furnace is used for evacuating a cavity of the single crystal furnace, and a negative pressure state is formed in the cavity; after the single crystal furnace reaches vacuum, stopping the vacuumizing process, and performing leak detection on the cavity of the single crystal furnace by using an isolating valve; after leakage detection is completed, the single crystal furnace is filled with heat preservation gas; the heat preservation gas flows out through the gas guide hole 1 after passing through the heat preservation part in the circulation process. The cavity is formed in the furnace bottom and filled with the heat preservation gas, the filling gas replaces a traditional curing felt to serve as a heat preservation material, the heat preservation effect is better, pulverization is avoided, and the service life is longer. The bottom supporting point of the furnace bottom supporting device is made of a ceramic material, the strength of the ceramic supporting material is higher, and the problem that the crystal pulling quality is affected due to the fact that the strength of a traditional curing felt is reduced and the device cover distance is reduced in the high-temperature operation process of the single crystal furnace can be solved.

Thermogravimetric Reactor (TGR) and process to study weight change behavior of carbonaceous solids / catalysts during thermo-chemical reactions in gaseous environment up to the maximum operating temperature of 1000° C. and at atmospheric pressure are disclosed. The device includes a vertical tube reactor, digital weighing balance, gas feeding system equipped with volumetric flow controllers, rotameters, isolation valves and non-return valves to introduce inert and reactive gases and their mixtures to the reactor. It also has a movable electrical furnace heater for sudden heating / cooling of sample as per requirement. It also has sample feeding / loading system comprising containers of different sizes and shapes with a hanging arrangement There is arrangement to test the product gas composition with on line gas analyzer in the exit line or collecting the outgoing gas from the sampling port for off line gas analysis. The system also has control panel to store and display data including process parameters.

The utility model provides an ion implanter and a semiconductor processing system, and relates to the technical field of ion implanters. The ion implanter comprises a cavity, an exhaust pipeline, a one-way valve, an isolating valve and a tail gas treatment device, the cavity is communicated with the tail gas treatment device through the exhaust pipeline, and the one-way valve and the isolating valve are installed on the exhaust pipeline; wherein when the ion implanter is in an exhaust state, the isolation valve is conducted; when the suction force of the tail gas treatment device is greater than or equal to a threshold value, the one-way valve is switched on; when the suction force of the tail gas treatment device is smaller than a threshold value, the one-way valve is switched off; and when the ion implanter is in a non-exhaust state, the isolating valve is switched off. The ion implanter and the semiconductor processing system provided by the utility model have the advantage of being capable of effectively preventing waste gas from flowing back into the cavity.

A cryogenic liquid storage system comprising an outer tank 22, and an inner tank 24 configured to hold cryogenic liquid, an isolation valve 40, and a collection chamber 26, outside the outer tank, and

The utility model discloses an isolating valve of a passive ventilation system of a nuclear power station, and belongs to the field of isolating valves. Comprising a valve body of a tubular structure; the valve plate is arranged in the valve body and used for opening and closing the valve body; the sealing piece is arranged at one end of the valve body and used for sealing the valve body and the valve plate; the valve rod is used for driving movement; the three-section type eccentric connecting rod structure is used for enabling the valve rod to drive the valve plate to translate along the center line of the valve body when the valve plate is opened and to turn to be parallel to the center line of the valve body after a certain distance is reached. The nuclear power station passive ventilation system isolation valve has the beneficial effect that the nuclear power station passive ventilation system isolation valve is provided.

This invention discloses an energy-saving and high-efficiency seawater flue gas desulfurization system and intelligent control method. The system includes a seawater supply unit, a desulfurization reaction unit, and an intelligent control unit. The seawater supply unit includes a seawater pool, a fixed-frequency pump, and a variable-frequency pump. Electric isolation valves are installed on the outlet pipes of the fixed-frequency pump and the variable-frequency pump. The desulfurization reaction unit includes an absorption tower with a single-layer spray layer inside, and the main outlet pipe is connected to the single-layer spray layer. The intelligent control unit is electrically connected to the fixed-frequency pump, the variable-frequency pump, and the electric isolation valve. It is used to monitor flue gas parameters and actual flow rate in real time, and dynamically adjust the frequency of the variable-frequency pump, the start and stop of the fixed-frequency pump, and the opening and closing of the electric isolation valve to match the water supply with the desulfurization load. This invention achieves continuous and precise flow rate regulation, significantly reducing energy consumption and investment costs.

The application belongs to the technical field of reactor thermal-hydraulic, and particularly relates to a test system for simulating passive safety injection pipeline rupture. The system comprises a full-pressure water replenishing tank simulation body and a break pipeline. The top of the full-pressure water replenishing tank simulation body is connected with a cold pipeline section of a pressure vessel simulation body through a balance pipeline, and the bottom of the full-pressure water replenishing tank simulation body is communicated with a descending ring cavity of the pressure vessel simulation body through a DVI main pipe. A first isolation valve is arranged on the balance pipeline. Both ends of the break pipeline are connected to both ends of the first isolation valve through a second isolation valve and a third isolation valve. A fourth isolation valve is arranged on the DVI main pipe. Both ends of the break pipeline are connected to both ends of the fourth isolation valve through a fifth isolation valve and a sixth isolation valve. At least one break simulation piece is connected in series on the break pipeline. The embodiment of the application can be used to carry out passive safety injection system response characteristic tests under the conditions of small break and double-end break in the balance pipe and the DVI pipe.

A dual-redundancy electro-hydrostatic actuator comprises a first motor pump and a second motor pump which are energy assemblies of the electro-hydrostatic actuator; the first motor pump and the second motor pump are respectively provided with a first electromagnetic isolating valve and a second electromagnetic isolating valve which are used for controlling connection and disconnection between the first motor pump and the hydraulic cylinder and between the second motor pump and the hydraulic cylinder; the energy accumulator is an oil supplementing assembly of the electro-hydrostatic actuator, provides stable pressure when the motor pump works at a high speed, and prevents the electro-hydrostatic actuator from sucking air; the one-way valve is located between the energy accumulator and the hydraulic cylinder, the energy accumulator supplies oil to the hydraulic cylinder through the one-way valve, and oil is prevented from reversely flowing back to the energy accumulator; the safety valve plays a role in limiting the maximum pressure of the electro-hydrostatic actuator, and the electro-hydrostatic actuator is prevented from being damaged due to the fact that the pressure exceeds the limit; the sensor is used for judging the working states of the first motor pump and the second motor pump of the electro-hydrostatic actuator, and after signals of the sensor are sent to the controller, the controller achieves fault diagnosis of the motor pumps and triggers updating of system state identifiers.

The application discloses an alloy vacuum separation furnace, which comprises a runner, a separation chamber and a mold system; the separation chamber comprises an isolation box, and an upper molten pool, an inclined part and a lower molten pool are arranged in the isolation box from top to bottom. The number of the inclined part is more than one, and the inclined part has an inclined surface. Alloy melt to be separated is poured into the upper molten pool through the runner; the upper molten pool and the lower molten pool are provided with plug parts; the melt in the upper molten pool can flow into the inclined part downstream of the upper molten pool by opening the plug part of the upper molten pool, and then flow into the lower molten pool through the inclined part. The mold system comprises a preparation chamber, a second isolation valve, a pouring chamber, a third isolation valve and a discharge chamber which are sequentially connected, and the pouring chamber is connected with the separation chamber. The melt in the lower molten pool can be quantitatively poured into a mold in the pouring chamber. The alloy vacuum separation furnace is continuously worked through the inclined part, the production efficiency is improved, and the alloy vacuum separation furnace is suitable for large-batch continuous production. The application further discloses an alloy separation method implemented by using the alloy vacuum separation furnace and a copper and zinc material.

The invention relates to a device for melting metal by means of solar energy, the device comprising a crucible (11) able to contain a liquid metal and a gas-tight enclosure (9, 13), wherein the enclosure contains the crucible, the crucible being in mechanical contact with the enclosure, wherein the enclosure comprises a first duct (7) configured for the introduction, into the enclosure and into the crucible, of divided solid metal, a second duct (14) configured for the removal, from the crucible and the enclosure, of liquid metal, and a third, optical duct (15) configured for the entry, into the enclosure and into the crucible, of sunlight (4), wherein the first duct comprises a first isolation valve (1.b) for gases, the second duct comprises a second isolation valve (1.c) for gases, and the third duct comprises a window (6) transparent to sunlight.

A manual dual-channel gas pressure regulator is provided, comprising: a first gas channel including: an inlet valve connected to a gas source; a first fine-tuning unit having an inlet and two outlets, the inlet being connected to the inlet valve and one outlet being connected to the atmosphere via a vent valve; a first connector connected to the other outlet; an isolation valve, one end connected to the other outlet and the other end connected to the second gas channel; and a second gas channel including a second fine-tuning unit, an adapter, and a second connector, the adapter being connected to the other end of the second fine-tuning unit, the second connector, and the isolation valve, respectively; wherein the first and second connectors are used to connect to the piston pressure gauge under test and a standard piston pressure gauge. This reduces the time required for piston pressure gauge balancing experiments and makes operation more convenient.

The present application relates to the field of maintenance, in particular to a main steam isolation valve pressure relief valve automatic calibration device and calibration method. The device comprises: the upper cylinder of the MSIV simulation body is connected with a nitrogen cylinder; the oil tank is connected to the oil inlet of the MSIV simulation body through an oil inlet pipeline, and the oil return outlet of the MSIV simulation body is connected to the oil tank through an oil return pipeline; the inlet electromagnetic valve and the pneumatic pump are in an integrated structure, which is arranged on the oil inlet pipeline, and the pneumatic pump delivers the high-pressure fire-resistant oil in the oil tank to the MSIV simulation body; the inlet electromagnetic valve controls the start and stop of the pneumatic pump; the lower oil cylinder of the MSIV simulation body returns the fire-resistant oil to the oil tank through a flow control valve; two pressure relief valves are arranged in series on the oil return pipeline, and each pressure relief valve is controlled by a quick closing electromagnetic valve; the action of the pressure relief valve is measured by a displacement measuring element; a first pressure measuring element is arranged at the oil return outlet of the MSIV simulation body, and a second pressure measuring element is arranged on the oil return pipeline arranged between the two pressure relief valves. A control system is used to control the actuator to automatically perform function test, and to perform system monitoring, equipment debugging and data playback, and to alarm for the function test that does not pass. The present application simulates the actual operation condition of the pressure relief valve during the action of the MSIV, tests the comprehensive performance of the MSIV pressure relief valve, and then guides the subsequent maintenance direction of the pressure relief valve, finally verifies whether the performance of the pressure relief valve after maintenance is qualified, effectively avoids blind repair and wrong repair; and can also check the new spare parts to confirm their usability.

A dynamic coking isolation valve seat machine manufactured from a single piece of metal and that includes a system of dynamic disc, such as a disc spring or Belleville washer that activate the seat.

The embodiment of the invention provides a high-pressure oil tank system and a sealing performance diagnosis method. The high-pressure oil tank system comprises an oil tank and a carbon tank. A vent valve is arranged on the oil tank and connected with an oil tank isolating valve through a pipeline, and the oil tank isolating valve is connected with the carbon tank through a connecting pipe; the oil tank isolating valve is used for closing or communicating the oil tank and the carbon tank; the other side of the carbon tank is connected with a carbon tank electromagnetic valve through a desorption pipe; the carbon tank electromagnetic valve is used for controlling the carbon tank to start or stop; a temperature and pressure sensor is arranged on the oil tank and used for detecting the temperature and the pressure in the oil tank in real time, and sealing performance diagnosis is achieved through the detected temperature difference and the detected pressure difference. By arranging the temperature and pressure sensor, the environment temperature in the oil tank is measured, meanwhile, the oil tank temperature and pressure are associated for diagnosis, parking diagnosis without internal combustion engine operation is achieved through natural vacuum or pressure brought by temperature changes to the high-pressure oil tank, and the diagnosis scheme does not depend on internal combustion engine operation.

A fuel tank vent valve includes a venting apparatus for regulating discharge of fuel vapor from a fuel tank and admission of outside air into a fuel tank. The vent valve is used to regulate pressure in a fuel tank.

The present application relates to a kind of modular molten salt loading and storage system, including vertical support structure rack, normal temperature electrical equipment group and high temperature molten salt equipment group are physically separated by isolation fence and integrated in it;High temperature molten salt equipment group includes molten salt storage tank and molten salt pipeline connected with molten salt storage tank;Molten salt pipeline includes molten salt loading pipe, molten salt loading pipe has upward inclination relative to horizontal plane, to realize the self-weight backflow of molten salt;The middle section of molten salt loading pipe is connected with molten salt isolation valve, and molten salt isolation valve and normal temperature electrical equipment group are cooperated to realize the on-off control of molten salt loading pipe.The present application effectively avoids the thermal influence of high temperature environment on normal temperature electrical equipment by isolation fence, and the integrated design of overall modularization integrates the core equipment of molten salt loading and storage into one, discards the traditional dispersed equipment arrangement and installation mode, greatly simplifies the field construction process, reduces installation period, also makes the debugging, maintenance and overhaul of system more convenient.

The invention belongs to the technical field of nuclear power plant containment penetration piece isolation valve sealing tests, and particularly relates to a rubber sealing and blocking structure and a test method. Comprising a self-sealing type rubber sealing plug and a pressing type rubber sealing plug and is used for sealing and plugging an outlet of the check valve. The self-sealing type rubber sealing plug comprises first chains, a rubber sealing ring and a plug structural body, the plug structural body is a main body part of the plug, the annular rubber sealing ring is installed in a groove of the plug structural body to play a sealing and plugging role, and the multiple first chains made of metal materials are fastened in the plug structural body. The device has the advantages that a penetration piece swing check valve sealing test method is optimized, a systematic test method is optimized into a valve single body sealing test, and the device has the functions that a check valve rocker arm is not disassembled, and a rubber part can be replaced on site for reuse.

The utility model provides a novel safety injection tank. The novel safety injection tank comprises a safety injection tank nitrogen tank and a safety injection tank water tank which are independently arranged, the safety injection tank nitrogen tank is connected with one end of the safety injection tank water tank through a gas-water tank connecting pipeline; and the other end of the safety injection tank water tank is connected with a safety injection tank injection pipe and is connected with a reactor coolant system. According to the design scheme of the novel safety injection tank, compressed nitrogen used for driving and safety injection water serving as a water source are separated and stored in the gas phase and the water tank respectively, then the two tank bodies are connected through the pipeline, and the valve is arranged on the pipeline to control the communication / isolation state of the two tank bodies. When the nuclear power plant is in a normal operation state, the isolating valve is in a closed state to isolate a gas phase from a water tank; when LOCA accidents and the like occur and the safety injection tank needs to be put into operation, the valve can be opened through signals, the water tank is communicated with the gas tank, and therefore effective injection of the safety injection tank is achieved.

The utility model relates to a high-pressure flushing system of a trailing suction dredger. The device is characterized by comprising a high-pressure flushing pump, a high-pressure flushing pump suction pipeline, a high-pressure flushing pump series pipe, a high-pressure flushing pump suction valve, a series valve, a first isolating valve, a drag head flushing pipeline, a ballast pipeline, a ballast valve, a second isolating valve, a drag head flushing control valve, a mud cabin dilution valve, a mud cabin dilution pipe and a dilution nozzle, according to the high-pressure flushing system of the trailing suction hopper dredger, under the condition of the same loading capacity, the effective loading time is greatly shortened, the working efficiency is greatly improved, the pumping period is shortened, and the pumping time is greatly shortened and the economical efficiency is improved due to the fact that a mud cabin dilution system works all the time.

The invention provides a printer ink path pressure adjusting system and method, and belongs to the technical field of printers. The system comprises a plurality of independent pressure regulating units, a common negative pressure source, a plurality of isolating valves and a controller. Each pressure adjusting unit corresponds to one ink path channel and comprises an independent negative pressure cavity, a negative pressure sensor and a switching valve. The public negative pressure source is composed of a public negative pressure cavity, a negative pressure pump and a controlled air inlet device. And the isolating valve is arranged between the independent negative pressure cavity and the public negative pressure cavity. The controller controls the switching valve, the isolating valve, the positive pressure source, the negative pressure pump and the controlled air inlet device according to feedback of the negative pressure sensor, and independent closed-loop adjustment is carried out on the pressure of each ink path channel. Through an independent unit and common source architecture, parallel independent control of pressure of multiple ink paths is realized, the structure is simplified, the cost is reduced, and the stability of pressure regulation and the recovery speed after positive and negative pressure switching are optimized through the controlled air inlet device.

The invention discloses automatic doping equipment and a doping method thereof. The automatic doping equipment comprises a bin, a doping opening and a first opening are formed in the bin, the first opening can be communicated with the single crystal furnace, an isolation part is arranged in the bin, a first driving mechanism can drive the isolation part to be opened / closed at the first opening, and a second driving mechanism can drive a material storage part to sequentially extend into the bin and extend out of the first opening. The storage part can be driven by the second driving mechanism to rotate when extending out of the first opening; the doping method comprises the following steps: mounting the chamber on an isolating valve of the auxiliary chamber of the single crystal furnace; closing the isolation part at the first opening; the material storage part extends into the bin chamber; a doping bin door is opened, and the materials are doped into the material storage part through a doping opening; closing the doping bin door; and opening the isolation part at the first opening, and enabling the material storage part to sequentially pass through the first opening and the isolation valve and then extend into the single crystal furnace main chamber to carry out doping operation. The invention is applied to the technical field of single crystal furnaces.