77 results about "Fusible plug" patented technology

The invention relates to a welding repairing method for aluminum parent metal, in particular to an in-situ self-propagting welding repairing method for aluminum parent metal. The method is characterized in that: self-propagting medical preparation is firstly prepared, and cleaning, oil removal, oxide film removal are carried out on parts to be welded of aluminum parent metal, then welding fluid is coated on a groove face; according to the shape and size of the groove, a mould with lower holes is made by graphite and is fixed on the upper part of the groove, and a graphite plate is clamped at the two sides of the groove by a clamping device and forms a melting chamber together with the mould, an automatic fusible plug is laid at the bottom part of the mould, then the self-propagting medical preparation is poured into the mould, pyrophoric powder is coated above the self-propagting medical preparation, after the parent metal is preheated to a certain temperature, the pyrophoric powders is lighted, thus realizing in-situ self-propagting welding repairing of the aluminum parent metal. By the method provided by the invention, intense magnetic field interference can be avoided, welding quality can be improved, labor intensity can be relieved, and the operation is easy and rapid.

A hydrogen tank is mounted on a roof so that a valve unit mounted to one end in a longitudinal direction of the hydrogen tank is separated as far apart as possible from a front platform and a middle platform of a fuel cell equipped bus and so that the longitudinal direction of the hydrogen tank is in a lateral direction of a vehicle. Thus, even if hydrogen leaks from the valve unit or a fusible plug valve of the valve unit is fused to discharge hydrogen from the tank, the influence of the leaking or discharged hydrogen on the front platform and the middle platform can be reduced.

A valve system includes a fusible plug valve that functions as a fusible plug valve and as a manual valve. When functioning as a fusible plug valve, the fusible plug valve opens at a high temperature to release gas from a high pressure tank to outside. When functioning as a manual valve, the fusible plug valve is opened manually to release the gas from the high pressure tank to the outside.

The invention discloses a receiver dryer, which comprises a refrigerant inlet, a filter screen, a drying agent, an eduction pipe, a refrigerant outlet and a fusible plug. The receiver dryer is a revolving body, and provided thereon with the refrigerant inlet and the fusible plug. The eduction pipe is arranged in the axial direction inside the receiver dryer, and penetrates the filter screen. The drying agent is arranged at the middle of the filter screen. The eduction pipe is connected with the refrigerant outlet. The receiver dryer can efficiently filter water and impurities in a refrigerant, can store redundant liquid refrigerant, and enhances the heat dissipation effect of condensers.

Provided is a refrigeration apparatus with improved safety. A refrigeration apparatus includes: a compressor; a heat source-side expansion valve to be controlled to have a minimum opening degree and brought into a closed state in which the heat source-side expansion valve maximizes prevention of a flow of a refrigerant toward a usage-side refrigerant circuit; a fusible plug; a controller; and a refrigerant leak detector configured to detect a refrigerant leak at the usage-side refrigerant circuit. The fusible plug is disposed in a refrigerant circuit, and is brought into an open state to allow the refrigerant circuit to communicate with an external space. When the refrigerant leak detector detects a refrigerant leak at the usage-side refrigerant circuit, the controller performs refrigerant leak first control to bring the heat source-side expansion valve into the closed state, and performs refrigerant leak second control to bring the fusible plug into the open state.

The invention discloses a high-temperature early warning system of a coupler, and belongs to the technical field of early warning systems of transmission machinery. The high-temperature early warning system comprises a temperature sensor, a signal transmitter, a signal receiver, a central processing unit, an indicator lamp, an alarm device, a displayer and a power source, wherein the temperature sensor and the signal transmitter are arranged on an outer shell of the coupler, and the temperature sensor, the signal transmitter and the power source are connected in sequence; the signal transmitter is matched with the signal receiver and is in wireless connection with the signal receiver; the signal receiver is respectively connected with the indicator lamp, the alarm device and the displayer through the central processing unit, and the signal receiver, the central processing unit, the indicator lamp, the alarm device and the displayer are respectively connected with the power source. The high-temperature early warning system has the advantages that the temperature sensor measures the working oil temperature in the coupler and transmits a result to the central processing unit; when the measurement result exceeds a set range value, the indicator lamp and the alarm device are opened under the control of the central processing unit to remind users to pay attention, the situation that the coupler is damaged because the oil temperature is overhigh is avoided, and oil waste caused by use of a fusible plug is also avoided.

The invention discloses a safety control system for a 30000Psi ultrahigh pressure wellhead. The safety control system for the 30000Psi ultrahigh pressure wellhead comprises a high-pressure hydraulic system, an ultrahigh pressure subsurface safety valve hydraulic-control main road and a low pressure control system. The high-pressure hydraulic system comprises a borehole safety valve hydraulic-control main road, and the borehole safety valve hydraulic-control main road comprises a borehole safety main valve branch and a borehole safety trickle valve branch. The low pressure control system comprises a fusible plug control branch, a borehole safety main valve pilot control branch, a borehole safety trickle valve pilot control branch and a subsurface safety valve pilot control branch. The ultrahigh pressure subsurface safety valve hydraulic-control main road increases the pressure to 30000psi to meet opening needs of a subsurface safety valve of a controlled object, and the fusible plug control branch causes shutoff of the subsurface safety valve, a borehole safety main valve and a borehole safety trickle valve through pressure relief. The safety control system for the 30000Psi ultrahigh pressure wellhead solves the problem that an existing conventional wellhead control panel cannot achieve full-electro-hydraulic automatic control when the pressure reaches 30000Psi, and realizes thefull-electro-hydraulic automatic control over the wellhead control panel of an ultrahigh pressure oil and gas well.

A locking device in a fire damper comprises a fan-shaped lockhole plate, an actuating mechanism and a spindle of the actuating mechanism, wherein one end of the spindle of the actuating mechanism is inserted into a damper body; the fan-shaped lockhole plate and the actuating mechanism are arranged at the other end of the spindle of the actuating mechanism; a through hole is formed in the fan-shaped lockhole plate; a secondary temperature sensor is arranged on the same side as the actuating mechanism; one end of the secondary temperature sensor is arranged in the damper body; a latch in the other end of the secondary temperature sensor corresponds to the through hole formed in the fan-shaped lockhole plate; a step is arranged on the latch; a cylindrical spiral compression spring is arranged on an outer ring at the left end of the step and arranged in an inner cavity defined by a nut, a fusible plug fixing seat and a casing; and the protruding end of the latch is connected with a fusible sheet. With the adoption of the locking device, when fire happens, after the fire damper is off, a secondary temperature controller acts to lock blades of the fire damper timely when the air pipe temperature reaches a set value, so as to exert the effects of completely resisting smoke and fire. The locking device is widely applicable to nuclear power engineering and domestic and overseas construction projects with high requirements on fire resistance and smoke prevention.

The invention provides an electro-hydraulic executer capable of preventing fire loss increment, and solves the problem of the way to prevent the fire loss increment. The electro-hydraulic executer comprises an electromagnetic reversing valve, an energy storer and an oil pipe thereof, an oil tank and an oil return pipeline thereof; one end of a fusible plug pipeline and a control cavity of a hydraulic reversing valve are both connected to an oil pipe of the energy storer; the other end of the fusible plug pipeline is connected to an oil return pipeline of the oil tank; and when a rotating oil cylinder drives a valve to close, the hydraulic reversing valve is associated with the electromagnetic reversing valve. When fire occurs, a fusible plug is molten, and the fusible plug pipeline is opened; the fusible plug pipeline controls high-pressure oil in the cavity to leak; the hydraulic reversing valve is opened; the high-pressure oil of the energy storer enters an oil port of an A oil cylinder by the hydraulic reversing valve; meanwhile, no-pressure oil in a B oil cylinder flows back into the oil tank; a driving rack is shifted from the A oil cylinder to the B oil cylinder; and the driving valve is closed to prevent the fire loss increment.

The invention discloses an oil-water dual-purpose fluid coupling with a brake drum. The oil-water dual-purpose fluid coupling comprises a connecting disc and the brake drum; the connecting disc and the brake drum are respectively matched with a power machine shaft and a working machine input shaft to be mounted on the same axis; one end of the connecting shaft is mounted opposite to a claw of the brake drum; an elastic block is arranged between the connecting shaft and the brake drum; the two ends of a rear auxiliary cavity are respectively connected with the connecting disc and a pump impeller; the rear auxiliary cavity, the pump impeller, a housing (or a side auxiliary cavity) and a sealing gland are provided with anti-fall off spring oil seals and are sealed with excircle of a main shaft; the sealing gland is mounted on the housing, and used for pressing a bearing on the main shaft; a spigot of the rear auxiliary cavity is mounted on the pump impeller, and used for pressing another bearing at the other end of the main shaft; liquid injection plugs are arranged on the pump impeller, and screw holes in the liquid injection plugs are communicated with the pump impeller; a fusible plug and an explosion-proof plug are arranged in the housing (or the side auxiliary cavity), and screw holes in the fusible plug and the explosion-proof plug are communicated with the housing; lips of the oil seals are respectively sealed with the excircle of the main shaft; a working cavity is oblate. The oil-water dual-purpose fluid coupling has the advantages that various liquids can be used, and the use is convenient.

The invention relates to a temperature-sensing pressure-sensing anti-explosion device. By adoption of the temperature-sensing pressure-sensing anti-explosion device, the problems of low safety coefficient and pollution to the environment in the prior art are mainly solved. The temperature-sensing pressure-sensing anti-explosion device comprises a fusible plug (2) containing a fusible alloy, an explosion disc (3), a control valve (4), a pressure releasing pipeline (5) and a buffering container (6), wherein the explosion disc (3) and the fusible plug (2) are arranged on the wall of a reactor (1), and are respectively connected with the pressure releasing pipeline (5) by pipelines in a parallel mode; and the other end of the pressure releasing pipeline (5) is connected with the buffering container (6). By adoption of the technical scheme, the problems are relatively well solved, and the temperature-sensing pressure-sensing anti-explosion device can be used for achieving the anti-explosion purpose of the container.

Because the alloy for a conventional fusible plug contains harmful elements such as Cd and Pb and the like, the harmful elements may cause pollution. The invention provides a fusible plug. The fusible plug does not contain the harmful components Cd and Pb; even if the fusible plug is used as a safety device of a freezing device for long time, the alloy cannot be extruded from the fusible plug; and the fusible plug has strong mechanical properties such as creep property and the like. The invention adopts the solution that: the fusible plug adopts the following alloy for the fusible plug: the alloy melted at the temperature of between 70 and 75 DEG C comprises 0.1 to 2.0 mass percent of Sn, 31 to 37 mass percent of Bi and the balance of In; and the alloy melted at the temperature of between 90 and 95 DEG C comprises 0.05 to 0.4 mass percent of Zn, 47 to 55 mass percent of Bi and the balance of In.

The invention relates to the field of temperature protection technologies for torque limited hydraulic couplings, in particular to a reusable fusible plug for a hydraulic coupling. By the aid of the reusable fusible plug, the problem that fusible alloy for existing torque limited hydraulic couplings cannot be reused after being melted to relieve pressures under overload conditions can be solved. The reusable fusible plug has the advantages that ferromagnetic materials with standard temperatures at a Curie point are fixed into a valve spool and a valve seat by the aid of 'Curie effect' principles, so that the fusible plug is in a normally closed state, the valve spool can be opened and closed at temperatures higher than or lower than temperatures of protection points, transmission liquid in an inner cavity of the coupling can be quickly drained under the control when the temperatures reach the limit, and a closed working cavity can be formed by the inner cavity of the coupling after the temperatures are reduced; the fusible plug has a temperature protection function under overload conditions of systems and does not need to be replaced after the temperatures are reduced under shutdown conditions, the systems can be started only after working media are injected into the systems, accordingly, the fusible plug can be reused, and the operability of hydraulic coupling products can be improved.

The invention discloses a natural gas dryer. The natural gas dryer comprises a first inlet, a fusible plug, an outlet, a second inlet, a casing, a drying agent, an extraction pipe and porcelain balls, wherein the first inlet and the second inlet are located on two horizontal sides of the top of the dryer, the outlet is located in the center of the top of the dryer, the fusible plug is arranged at the upper end of the extraction pipe, and the porcelain balls cover the upper layer of the drying agent. The natural gas dryer is reasonable in design, simple in structure, safe, portable and capable of realizing repeated drying.

The invention discloses a wellhead control system and a control method thereof. The wellhead control system comprises an intelligent controller, wherein the intelligent controller comprises a centralprocessing unit, and the input end of the central processing unit is electrically connected with the output end of a data acquisition assembly for comprehensively detecting the wellhead; the output end of the central processing unit is electrically connected with an alarm, a ground safety valve, an underground safety valve, an HIPPS high-integrity pressure protection system, an EDS emergency shutdown system, a fusible plug control disc and a hydraulic power unit, and a power generation device supplies power to a charging power supply; and the central processing unit is connected with a monitoring terminal in a signal mode through a wireless communication module so as to facilitate remote control. According to the control method, the wellhead control system is utilized for control, and thuspotential safety hazards can be quickly eliminated; and workers can be advantageously reminded to rapidly withdraw on the site through alarming, and thus asset loss and casualties can be advantageously reduced.

The invention provides a fusible plug operating temperature and anti-extrusion test pressurizing device comprising an internal threaded joint (10) which is used for installing a fusible plug (40), a connecting pipe (20) which includes a connector connected with a fast testing joint (50), and a gas control valve (30) which is connected between the internal threaded joint (10) and the connecting pipe (20) and is used for controlling on-off of the air passage of the internal threaded joint (10) and the connecting pipe (20). The fusible plug operating temperature and anti-extrusion test pressure device can prevent the hidden safety troubles of gas leakage and fast testing joint fly-off during fusible plug operating temperature and anti-extrusion pressurization testing in the prior art.