37 results about "Decreased pressure" patented technology

The invention discloses a high-low pressure adjustable constant-temperature hydraulic device, and belongs to the technical field of hydraulic equipment, the high-low pressure adjustable constant-temperature hydraulic device comprises an oil tank main body, a pressure compensation mechanism, a pressure relief mechanism, a vacuum mechanism, a condensation mechanism and a heat dissipation mechanism, the top of the oil tank main body is provided with a hydraulic pump, and one end of the hydraulic pump is connected with a pressure gauge; an oil outlet is formed in the other end of the pressure gauge, the hydraulic pump communicates with the interior of the oil tank body, and an oil return opening is formed in the other end of the top of the oil tank body. The device has the beneficial effects that when the internal pressure of the oil tank is increased, redundant air pressure is exhausted to the pressure bin through the connecting pipe, the first piston moves upwards to store air, shell deformation is avoided, when the pressure is normal, the first piston resets to the middle position by means of spring force, and when the pressure is reduced, the connecting pipe generates suction force, the first piston moves downwards, air compensates the air pressure of the oil tank, and balance is kept; the mechanism effectively isolates internal and external air straight-through, and keeps the internal pressure of the oil tank stable.

The invention relates to a deep sea environment simulation device and a deep sea equipment performance test method, and the device comprises a pressure cylinder which is used for accommodating fresh water; the pressure increasing and relieving system is connected with the pressure cylinder; the seawater cabin is arranged in the pressure cylinder, the interior of the seawater cabin is used for placing a test object and accommodating seawater, and a deformation part is arranged on the cabin wall of the seawater cabin; wherein when the pressure increasing and releasing system pressurizes fresh water in the pressure cylinder, the fresh water applies pressure to the deformation part, the deformation part deforms to enable the pressure of seawater in the seawater cabin to be increased, and when the pressure increasing and releasing system releases pressure of the fresh water in the pressure cylinder, the deformation part deforms reversely to enable the pressure of the seawater in the seawater cabin to be increased. The pressure of seawater in the seawater cabin is reduced, so that synchronous testing of pressure resistance, sealing performance and the like and corrosion resistance of deep sea equipment is realized, the test investment is reduced, and the test period is shortened.

The invention relates to the technical field of oil production engineering, in particular to a staged fracturing pump stopping test oil well packer and a control system thereof.The staged fracturing pump stopping test oil well packer comprises a central pipe, the upper end and the lower end of the central pipe are connected with an upper connector and a lower connector respectively, a rubber barrel is arranged on the periphery of the central pipe, and a thin groove is formed in the position, corresponding to the rubber barrel, of the central pipe; a traditional through hole is replaced by the thin groove, high-pressure fluid in the rubber sleeve can only be slowly decompressed through the thin groove after a pump is stopped, it is ensured that the rubber sleeve is kept in an expansion sealing state in a testing period, intersection fluid channeling is avoided, and pressure drop data of a well mouth and a well bottom truly reflects the characteristics of cracks and stratums; meanwhile, after the test is finished and the pressure of the high-pressure fluid in the central pipe is reduced to a certain value, the internal and external pressure difference of the first through hole pushes the piston to move upwards so as to open the second through hole, the fluid in the rubber sleeve can be rapidly discharged through the second through hole, the rubber sleeve rapidly shrinks and resets, the deblocking time is greatly shortened, and the single well fracturing operation efficiency is improved.

The utility model discloses a double-end diaphragm valve which comprises a valve body, two valve element assemblies and a valve element driving assembly, the number of the valve element assemblies is two, and the two valve element assemblies are symmetrically arranged along the central axis in the length direction of the valve body. The valve element driving assembly is configured to drive the valve element assembly to open or close the first valve port and / or the second valve port. By arranging the two symmetrical valve element assemblies and matching with the valve body provided with the main fluid channel, the flow dividing channel, the first branch channel and the second branch channel, pressure dividing of conveyed fluid is achieved, the pressure of the fluid to a valve port is reduced to half of the original pressure, and the applicable fluid pressure upper limit of the valve body is greatly improved; and meanwhile, a double-path independent fluid control function can be realized.

The utility model relates to the technical field of leveling, and discloses an automatic leveling hydraulic device which is characterized in that pressure balance and abrasion reduction are realized through structures such as a supporting disc, a bearing disc and a 3-RPS parallel mechanism, a small hydraulic cylinder is started according to angle inclination of the ground, the small hydraulic cylinder pushes a ball head through an output shaft, and the ball head is automatically leveled. One side, pushed by the 3-RPS parallel mechanisms, of the supporting disc is inclined, the extending length of each 3-RPS parallel mechanism is adjusted, the bottom face of the supporting disc makes complete contact with the ground, friction force maximization is achieved, the multiple 3-RPS parallel mechanisms are arranged to be used for reducing pressure of a single connecting column, meanwhile, the position of the supporting disc is fixed through ejection of a ball head, and therefore the supporting disc can be fixed. And the position deviation of the supporting disc in actual use is avoided, the more accurate leveling effect is achieved, and the effects of balancing pressure and reducing loss are achieved.

To prevent a force with which a positioning part of a fixing device is pressed against a positioning surface of a fixing housing from being reduced when a nip pressure is reduced SOLUTION: A fixing device 80 includes a first fixing member (heating roller 81), a second fixing member (pressure roller 82), an arm 84, a spring 85, a cam 86, an input gear, and a positioning part. The arm 84 can press the second fixing member toward the first fixing member. The spring 85 biases the arm. The cam 86 applies the first nip pressure at the first phase and applies the second nip pressure at the second phase. The positioning portion positions the fixing housing with respect to the main housing. When rotating the input gear, the drive gear presses the input gear so that the positioning portion is pressed against the positioning surface. The friction mechanism MM applies a greater frictional resistance to the heating roller 81 when the arm 84 is in the second position than when the arm 84 is in the first position.SELECTED DRAWING: Figure 4

Embodiments included herein are directed towards tire pressure monitoring. Embodiments of the present disclosure may include receiving temperature and history over multiple events of an individual tire and determining a first indication by comparing a relative temperature between various tires during an operation to predict a tire blow out scenario in a vehicle. Embodiments may also include determining a second indication by reviewing decrease in pressure of a wheel of the individual tire over time and comparing the decreased pressure of the wheel with other wheels of the various tires on the vehicle using an algorithm on a system level. Embodiments may further include forming predictive analysis based on the first indication and second indication to recommend further manual investigation of a vehicle usability as an aid in preventive maintenance of the vehicle. Embodiments may further include displaying the recommendation for the preventive maintenance of the vehicle to a user

Regulator (100) for a gas regulation apparatus and, in particular, of the type suitable to be installed in a gas transport and / or distribution network, comprising a containment body (110) with a gas inlet (310) and a gas outlet (320), said regulator (100) comprising within the containment body (110): - a first regulation stage (200) which is configured to reduce the pressure Pm of the gas entering the regulator (10) to a pressure P1, - a second regulation stage (210), which is fluidically in series and downstream of the first regulation stage (200), and which is configured to reduce the pressure P1 to a pressure P2 corresponding to the pressure Pu of the gas exiting the regulator.

A valve assembly (10) is disclosed which is configured to maintain a fluid flow therethrough at a constant flow rate. The valve assembly (10) includes a flexible flow control member (50) and an inlet opening (56) leading to an internal fluid chamber (90), the flexible flow control member defining an internal fluid chamber (90) within the flexible flow control member (50). An external fluid chamber (92) is defined between the flexible flow control member (50) and an inner surface (74) of a valve housing (20). The flexible flow control member (50) is configured to bend inwardly and contract the internal fluid chamber (90) in response to a decrease in pressure of the internal fluid chamber (90) relative to the external fluid chamber (92) due to an increase in the inlet flow rate, so as to maintain an outlet flow rate from the valve assembly (10) at a constant flow rate.

The present application provides a pressure drive system and a mobile robot, wherein the pressure drive system includes: an energy storage device, a pressure regulating device, a control device and an actuator. The energy storage device is connected to the input end of the pressure regulating device, the output end of the pressure regulating device is connected to the control device, and the control device is connected to the actuator. The energy storage device is used to store pressure medium and output the pressure medium to the pressure regulating device. The pressure regulating device is used to adjust the pressure of the pressure medium so that the pressure at the output end of the pressure regulating device is reduced to a set pressure, and the adjusted pressure medium is output to the control device. The control device is used to output the pressure medium to the actuator and control the flow and direction of the pressure medium to drive the actuator to execute the command action. The pressure drive system does not need to set up a hydraulic pump, which can avoid the problems of high noise, large weight and volume, low efficiency, and heat dissipation difficulties caused by setting up a hydraulic pump.

The invention relates to a device (100) for monitoring the particle load of a gas or gas mixture compressed to a predetermined first pressure, the device comprising a discharge line (102) which is designed and intended to forward the gas or gas mixture provided at the predetermined first pressure by a compressor (104), which is not part of the monitoring device (100), to a consumption point (106) which is also not part of the monitoring device (100). According to the invention, the monitoring device (100) also comprises: a branch line (108) which is connected to the discharge line (102) and is designed and intended to branch off part of the compressed gas or gas mixture; a pressure reducer (110) which is designed and intended to reduce the pressure of the gas or gas mixture to a second pressure; and a particle measuring device (112) which is connected to a section (108a) of the branch line (108) arranged downstream of the pressure reducer (110).

A pressure reduction device e.g. for gas mains, and having a slam shut valve, has a valve with a valve disc 336, actuator assembly 330, 332, 334 and a valve seat 312, high pressure chamber (100a, fig

Embodiments included herein are directed towards tire pressure monitoring. Embodiments of the present disclosure may include receiving temperature and history over multiple events of an individual tire and determining a first indication by comparing a relative temperature between various tires during an operation to predict a tire blow out scenario in a vehicle. Embodiments may also include determining a second indication by reviewing decrease in pressure of a wheel of the individual tire over time and comparing the decreased pressure of the wheel with other wheels of the various tires on the vehicle using an algorithm on a system level. Embodiments may further include forming predictive analysis based on the first indication and second indication to recommend further manual investigation of a vehicle usability as an aid in preventive maintenance of the vehicle. Embodiments may further include displaying the recommendation for the preventive maintenance of the vehicle to a user.

The invention relates to a negative pressure unit for a welding system, comprising a negative pressure chamber and a negative pressure pump which is designed to pump chamber gas out of the negative pressure chamber during operation in order to reduce the chamber pressure in the negative pressure chamber below the ambient pressure around the negative pressure chamber, and the negative pressure unit comprises a controllable ventilation valve with different opening degrees according to control. The invention also relates to a welding system having a negative pressure unit. The invention also relates to a method for operating a negative pressure unit, to an additional method for generating a feature map for reading a first vent valve opening by a target chamber pressure of a negative pressure unit, to an additional method for generating a feature map for reading a negative pressure pump closing pressure by a target chamber pressure, and an additional method of activating a negative pressure cell.

The invention provides a circuit breaker contact device with an overheating protection function, and relates to the technical field of circuit breakers, when the temperature of a contact blade is high, the heat of the contact blade is transmitted to a pressure spring and an expansion liquid in a hydraulic cavity through a support, the expansion liquid expands after being heated, so that a mounting plate is driven to slide towards a notch of a mounting groove, and the contact blade is prevented from being damaged. The pressure spring is further extruded, so that the contact blade can be tightly pressed with the static contact, and the problem of heating caused by poor contact between the contact blade and the static contact is solved; if the temperature of the contact blade is still continuously increased after the contact blade and the static contact are pressed, the volume of the expansion liquid is continuously increased, and when the pressure of the hydraulic cavity is greater than a threshold value, the thin wall is pressed and fractured, the expansion liquid is sucked into the negative pressure cavity by the negative pressure of the negative pressure cavity, so that the pressure of the hydraulic cavity is reduced, and the mounting plate moves towards the bottom of the mounting groove; and the mounting plate drives the contact blade to rotate through the pressure spring, so that the contact blade is disconnected from the static contact, and an overheating protection function is realized.

Bi-modal propulsion systems and related methods are generally described. In some embodiments, a bi-modal propulsion system may employ a single propellant for both chemical thruster(s), operating at elevated pressures, and electrical thruster(s) (e.g., electro spray thruster), operating at reduced pressures. The propellant pressure may be reduced to a desired operational range of the electrical thruster(s) using any appropriate construction including, for example, capillaries configured to reduce the pressure of the propellant to an operational range of the electrical thruster(s). In some embodiments, the reduced pressure of the propellant may be lower than a vapor pressure of at least one volatile component of the propellant, leading to the formation of “bubbles” within the propellant line. The presence of alternating gas and liquid phases along a flow path between a propellant tank and the electrical thruster(s) may help to electrically insulate the electrical thruster from the rest of the system.

The cycle comprises isochoric heating of working fluid in a cylinder (1), during which a displacer (3) and a piston (2) move synchronously in same direction, whereby the pressure and temperature of working fluid located between them increase, without a change in volume, due to heat received from a regenerator (4). This is followed by isothermal expansion of working fluid, during which the displacer (3) remains stationary while the piston (2) continues moving in same direction, and the pressure of working fluid located between them decreases, whereas its volume increases, without a change in temperature. Subsequently, isobaric cooling of working fluid is carried out, during which the displacer (3) remains stationary and the piston (2) moves toward the displacer. Under constant-pressure conditions, the volume and temperature of working fluid located between them decrease as a result of heat transfer to the regenerator (4). Simultaneously, cooled working fluid flows through a valve (5) into accumulator receiver. Finally, fresh portion of working fluid is drawn from accumulator receiver, during which the piston (2) remains stationary while the displacer (3) moves in opposite direction. After completion of suction process, the cycle is repeated.

To provide a compression system that reduces the gas pressure in a gas pipe and lowers the temperature of the gas being pumped to other gas pipes without improving the cooling capacity of the cooling device. [Solution] The compression system according to this embodiment comprises a compressor, a cooling device, and a control unit. The intake side of the compressor is connected to a sealed pipe to be drawn in. The exhaust side of the compressor is connected to a pipe to be supplied. The compressor can draw gas from the pipe to be drawn in and reduce the pressure of the gas in the pipe to be drawn in to a predetermined pressure. The compressor can compress the drawn-in gas to a pressure higher than the pressure of the gas in the pipe to be supplied and supply it to the pipe to be supplied. The cooling device can cool the gas supplied from the compressor to the pipe to be supplied. The control unit operates the compressor at a constant reference rotational speed to supply gas from the compressor to the pipe to be supplied. If the temperature of the gas cooled by the cooling device exceeds a threshold below the allowable temperature of the pipe to be supplied, the control unit lowers the rotational speed of the compressor to a lower than the reference rotational speed.

A manufacturing apparatus (100) for manufacturing an electrochemical cell having an outer body (210) under reduced pressure, the manufacturing apparatus comprising: a chamber (110); a pressure reducing device (130); and a return line (140), wherein the pressure reducing device (130) is designed to reduce a pressure in the chamber (110), the return line (140) contains a first opening (141), a line (143) and a second opening (142), the first opening (141) and the second opening (142) are each independently open to the interior of the chamber (110), the first opening (141) is connected to the outer body (210), the line (143) connects the first opening (141) to the second opening (142), and the conduit (143) is designed to once draw a gas in the outer body (210) from the chamber (110) when the pressure in the chamber is reduced and then return the gas to the chamber.

The utility model discloses an automatic oil supplementing and oil way control device for internal leakage of a hydraulic cylinder. The automatic oil supplementing and oil way control device comprises a plunger pump and a hydraulic cylinder device, one end of the plunger pump is connected with a stop valve, one side of the top of the stop valve is connected with a pressure measuring connector A, the top of the stop valve is connected with a pressure gauge, the top of the pressure gauge is provided with an electromagnetic valve, and the top of the electromagnetic valve is connected with a hydraulic control one-way valve; when the hydraulic cylinder leaks internally, the pressure of the working cavity of the hydraulic cylinder cannot be reduced due to the internal leakage, and when the hydraulic cylinder leaks internally, the position of equipment cannot be changed due to the internal leakage; the design is small and exquisite, use is convenient, pressure oil can be led to a working cavity of a hydraulic cylinder through a pressure measuring point of the hydraulic valve stand for oil supplementing, no hydraulic pump needs to be additionally arranged, joints are not temporarily arranged on pipelines, and oil supplementing pressure and flow setting is flexible and can be automatically adjusted according to use requirements; the application range is wide, and the hydraulic control one-way valve can be used for locking all hydraulic cylinder equipment for guaranteeing pressure in the hydraulic cylinder stop state.

An electromagnetic relief valve (100) includes: a back pressure chamber (8) to which hydraulic oil for biasing a main poppet (5) in the valve closing direction is guided; a pilot poppet (20) for allowing or preventing communication between the back pressure chamber (8) and a discharge flow path for discharging the hydraulic oil; and a solenoid unit (S) for biasing the pilot poppet (20) in the valve closing direction. The solenoid unit (S) includes: a plunger (72) that presses the pilot poppet (20); a spring (74) that biases the pilot poppet (20) in the valve closing direction; and a coil (75) that applies, to the plunger (72), a reaction force against the biasing force of the spring (74) to which a current is applied. When reducing the pressure of a high-pressure passage (H) to the pressure of a low-pressure passage (L), a current (Ir) that generates a reaction force greater than the biasing force with which the spring (74) biases the pilot poppet (20) in the valve-closing direction is applied to the coil (75).

A variable-pressure buffer device capable of preventing ground resonance provided by the present application includes: a buffer for absorbing energy; a pressure regulating component connected to the buffer; and a controller respectively connected to the buffer, the pressure regulating component and a wheel load signal switch. Wherein, when the helicopter takes off, the pressure of the buffer is reduced to a rated value, and the controller drives the pressure regulating component based on the wheel load signal and the pressure signal of the buffer to further reduce the pressure of the buffer to a target pressure value; after the helicopter leaves the ground, the controller drives the pressure regulating component based on the wheel load signal to increase the pressure of the buffer to the rated value. The present application reduces the air chamber pressure in a large lift state by means of an external air chamber, so that the buffer can be compressed to provide stiffness damping, and the buffer is restored to the rated pressure in the takeoff state.

An actuation device includes a Peltier comprising a first side and a second side; a first module thermally coupled to the first side of the Peltier, and a second module thermally coupled to the second side of the Peltier. The first module is configured to axially contract in response to an increased pressure within the first module and axially expand in response to a decreased pressure within the first module. The second module is configured to axially expand in response to an increased pressure within the second module and axially contract in response to a decreased pressure within the second module.

A mouthpiece including a body having a recess delimited by a flexible recess wall, the recess configured for encompassing a plurality of dental positions. The body is provided with a pressure chamber for containing a fluid under pressure. The recess wall is configured to deform by reciprocatingly increasing and decreasing a pressure in the pressure chamber between a decreased pressure condition and an increased pressure condition. The recess wall has a local deformability such that, when reciprocatingly increasing and decreasing the pressure in the pressure chamber, a shape of the recess wall locally changes. In the increased pressure condition, the shape of the recess wall is locally adjusted to the local shape of the dental positions encompassed by the recess wall. In the decreased pressure condition, the shape of the recess wall is locally less adjusted to the local shape of the dental positions encompassed by the recess wall.

The invention provides a compressor operation control method and a compressor. The present invention ensures stable oil supply to a compressor main body during cooling operation, and prevents the compressor main body from reversing when a drive source is stopped. The cooling operation is divided into a stop preparation period, which is a predetermined period immediately before a drive source such as an engine is stopped, and a main operation period, which is a period from the start of the cooling operation to the stop preparation period. The pressure in the receiving container (60) during the main operation period is set to be equal to or greater than a stable pressure P3 at which oil can be stably supplied to the compressor body (40), and the pressure in the receiving container (60) during the stop preparation period is reduced to a lower limit stable pressure P4, which is a pressure at which the compressor body (40) is not reversed when the drive source is stopped, and thereafter the drive source is stopped.

Described are apparatus and methods for processing a semiconductor wafer so that the wafer remains in place during processing. The wafer is subjected to a pressure differential between the top surface and bottom surface so that sufficient force prevents the wafer from moving during processing, the pressure differential generated by applying a decreased pressure to the back side of the wafer.

Hydraulic fluid is fed to a hydraulic cylinder via a feed line, and the hydraulic cylinder raises and lowers a mechanical device with a tool, where a lowering motion of the tool is reached by closing a second valve. Thereby, a third valve and a first valve are opened so that a first pressure is set between the first valve and the third valve, which corresponds to a pressure in the feed line and the cylinder at which the predetermined pressure or force effect can be exerted with the tool on the surface of the object. When a second pressure in the feed line between the hydraulic cylinder and the second valve is reduced to a value corresponding to the previously reached first pressure, the second valve is opened so that a pressure is maintained in the feed line up to the piston inside the hydraulic cylinder.