36results about How to "Stable pressure regulation" patented technology

The invention relates to a performance test system for an HCU (hydraulic control unit) in an automobile brake system and belongs to the technical field of quality detection of automobile chassis dynamically-controlled parts. The test system comprises a pressure lifting device, a hydraulic pipeline system, a measurement control device and an environmental simulation device, and all parts of the test system are connected through pipelines. By means of the performance test system for the HCU in the automobile brake system, parameters such as the response speed and the sealing performance of an HCU valve, the flow and the pressurizing capacity of a plunger pump, the volume of an energy accumulator and the like can be tested accurately.

An operating method for an externally heated once-through steam generator, in particular a once-through steam generator is heated using solar thermal energy and has a steam turbine connected downstream of the once-through steam generator. A pressure regulation device, having at least one turbine valve for regulating the pressure, is arranged in the feed water-steam circuit between the once-through steam generator and the steam turbine, the pressure regulation device being controlled by a control unit in such a way that, in the event of sudden load reductions, the drop in pressure associated therewith occurs, in a time delayed manner, by throttling of the at least one turbine valve.

The invention provides a cryoablation catheter and a cryoablation system. The cryoablation catheter comprises a catheter body and freezing balloons, wherein a refrigerant inlet chamber, a main refluxing chamber and a plurality of auxiliary refluxing chambers are arranged in the catheter body, the refrigerant inlet chamber, the main refluxing chamber and the auxiliary refluxing chambers all communicate with the freezing balloons, and the auxiliary refluxing chambers are used for regulating the internal pressure of the freezing balloons in an auxiliary manner. Based on the condition that cold energy of the cryoablation catheter is adjustable and controllable, the internal pressure of the freezing balloons can be stably regulated and controlled through employing a multi-chamber refluxing mode, the internal pressure of the freezing balloons of various dimensions can be in a safe use range, the clinical safe use of cryoablation catheters of various specifications is achieved, and customized / user-friendly treatment of different requirements is achieved. In addition, through additionally arranging the auxiliary refluxing chambers, the accuracy of control on flow rate can be further improved, the problem of single-chamber regulating that over regulation easily occurs is avoided, and the safety of cryoablation is improved.

The invention provides a vacuum pump analog loading system. The vacuum pump analog loading system comprises a measuring and controlling end, an gas-supplementing gas pump and a pressure-regulating gaspump; a pressure balancing module is arranged at the measuring and controlling end, a left cavity, a right cavity and a membrane located between the left cavity and the right cavity are arranged in the pressure balancing module, and the membrane deforms and deviates in the corresponding cavity according to the vacuum degree difference between the left cavity and the right cavity; the gas-supplementing gas pump provides supplementing gas from the outside to a vacuum tank, the pressure-regulating gas pump is in gas connection with the left cavity and provides or extracts the gas in the left cavity according to the vacuum degree in the left cavity, and the right cavity is in gas connection with the vacuum tank. Negative feedback control over the vacuum degree in the vacuum tank is achieved,and continuous and stable gas supplementing and pressure regulating are achieved.

A bidirectional proportional pressure regulating mechanism comprises a fluid laminar flow implementing mechanism, a first pressure measuring point, a second pressure measuring point and a pressure measuring point position regulating mechanism. The fluid laminar flow implementing mechanism comprises a valve core and a valve sleeve, wherein an oil inlet, a first oil outlet and a second oil outlet are formed in the valve sleeve, and the oil inlet is arranged between the first oil outlet and the second oil outlet. Working steps matched with the inner diameter of the valve sleeve are arranged at two ends of the valve core, and the clearances of the working steps of the valve core and the valve sleeve are communicated with the oil inlet, the first oil outlet and the second oil outlet. The first pressure measuring point and the second pressure measuring point are both pressure measuring holes penetrating through the valve sleeve, and the pressure measuring holes are communicated with the clearances. The pressure measuring point position regulating mechanism comprises the valve core and a pushing component pushing the valve core to move inside the valve sleeve, and the movement of the valve core enables an L1 and an L2 to change between 0 and L. The bidirectional proportional pressure regulating mechanism has the advantages that bidirectional rectilinear motion is adopted to achieve bidirectional differential-motion proportional stable pressure regulating, and control sensitivity is high.

The invention relates to a capillary pressure regulator. The capillary pressure regulator is characterized by comprising an upstream flow deflector, a downstream shell, a pressure regulating assembly and a spring, wherein a baffle for dividing interior of the upstream flow deflector into an upper cavity and a lower cavity which are not communicated with each other is arranged inside the upstream flow deflector; a water outlet hole is formed in the upper cavity; an air guiding pipe communicated with atmosphere is arranged on the lower cavity; a plurality of vent holes are also formed in the lower cavity; the downstream shell comprises a first cylinder body and a second cylinder body; the end part of the first cylinder body is connected with a shell connecting end of the upstream flow deflector; a plurality of positioning holes are formed in the side wall of the first cylinder body; the pressure regulating assembly is a cylindrical cavity with one opened side and one closed side; an outwardly-protruding spring installing groove is formed in the inner wall of a closed end; a positioning probe corresponding to the positioning holes is arranged on the outer wall of the closed end; the opened end of the pressure regulating assembly is connected with a pressure regulating assembly connecting end of the upstream flow deflector; a water stopping part is arranged between the opened end of the pressure regulating assembly and the pressure regulating assembly connecting end of the upstream flow deflector; and one end of the spring is pressed against the baffle inside the upstream flow deflector; and the other end of the spring is pressed against the bottom of the spring installing groove of the pressure regulating assembly.

The invention relates to a test bed for detecting the automotive air conditioning duct air leakage, comprising a regulator room, a pressure sensor arranged in the regulator room, a flow sensor, a solenoid valve, a computer, a blower, a blower controller and a pipeline; the blower is controlled by the blower controller; the regulator room is connected with the blower through the pipeline on which the flow sensor is arranged; the regulator room is provided with an interface for connecting the automotive air conditioning duct under detection; and the output end of the pressure sensor is connected with the blower controller. The test bed is provided with a relatively stable pressure room at the upstream of the automotive air conditioning duct under detection, so that a relatively stable pressure difference can be formed between the automotive air conditioning duct and the atmosphere; the automotive air conditioning duct air leakage caused by the effect of the pressure difference is equal to the air flow sent (or pumped under negative pressure) by the blower at the upstream of the regulator room; therefore, the air flow measured by the flow sensor is also the air leakage generated under the effect of the pressure difference by the automotive air conditioning duct.

The present invention provides a cryoablation catheter and a cryoablation system. The cryoablation catheter includes a catheter body and a cryoballoon. The catheter body is provided with an inlet refrigerant chamber, a main return chamber and several auxiliary return chambers. The refrigerant inlet cavity, the main return cavity and the auxiliary return cavity are all in communication with the cryoballoon, and the auxiliary return cavity is used to assist in regulating the pressure in the cryoballoon. On the basis of realizing the adjustable and controllable cold capacity of the cryoablation catheter, by adopting the form of multi-cavity reflux, the internal pressure of the cryoballoon is regulated and stabilized, ensuring that the internal pressure of cryoballoons of various sizes is within the safe use range , to achieve the safe use of cryoablation catheters of various specifications in clinical practice, and to meet the personalized treatment of different needs. In addition, by adding an auxiliary recirculation chamber, the control accuracy of the flow rate can be improved, the problem of easy overshoot when adjusting a single chamber can be avoided, and the safety of cryoablation can be improved.

The invention discloses a single-driving-roller clearance-free sand maker, and relates to the technical field of crushing equipment. The single-driving-roller clearance-free sand maker is composed of a rack 2, a power device, a movable roller 9, a fixed roller, a fixed roller bearing seat 7 and a pressure regulating device; the pressure regulating device comprises a pressure regulating power component, a pressure regulating component, a pressure regulating and applying component, a pressure regulating guide component and a pressure regulating transmission component. The single-driving-roller clearance-free sand maker has the characteristics of simple structure, convenience in maintaining, low running cost, long running cycle, high sand formation rate and the like, can be used for preparing sands for construction by utilizing materials including sand stones, cobblestones and the like, also can be used for front breaking and grinding of a grinding system, and can be widely applied to the fields including construction, construction materials, mines and the like.

A pressure regulating mechanism with two freedom degrees comprises a fluid laminar flow implementing mechanism, a plurality of pressure measuring points connecting with different pressure regulating mechanisms and a freedom degree regulating mechanism. The fluid laminar flow implementing mechanism comprises a valve core and a valve sleeve. A plurality of through grooves penetrating through the head and the tail of the valve core are axially formed in the side wall of the valve core, clearances formed by the through grooves and the valve sleeve are communicated with an oil inlet and an oil outlet, the flow of the fluid in the clearances is of a laminar flow state, and the pressure distribution of the oil inlet and the oil outlet is of stable linear distribution. The pressure measuring points are pressure measuring holes penetrating through the valve sleeve, and the pressure measuring holes are communicated with the clearances. The pressure measuring point position regulating mechanism comprises the valve core and a pushing component pushing the valve core to move inside the valve sleeve at two freedom degrees of a straight line mode and a rotating mode. The pressure regulating mechanism with the two freedom degrees has the advantages that the valve core has the motions of two freedom degrees of the straight line motion and the rotating motion simultaneously, the plurality of pressure measuring points can be connected with different pressure regulating mechanisms, the plurality of through grooves can regulate the range of the pressure regulating, and therefore the pressure regulating mechanism is enabled to be wide in application range, capable of being controlled in multiple points, stable in pressure regulating, and convenient to use.

The invention relates to an electromagnetic type pressure regulating valve which comprises a tightening cap, a valve body, an armature component, an electromagnet and a valve seat. The electromagnetic type pressure regulating valve is characterized in that a through hole is formed in the valve body; one end of the through hole communicates with peripheral space of the electromagnet; the other end of the through hole communicates with an oil outlet; circulation gaps are formed between an armature lever and the electromagnet and between the armature lever and a center hole of the valve body; a guide sleeve is in interference forced fit with the center hole of the valve body; the armature lever penetrates through the guide sleeve and is in tight sliding fit with the guide sleeve; a flat station is processed on the inner wall of the guide sleeve or on the outer wall of a matching section of the armature lever and the guide sleeve, and forms a circulation channel, so that the peripheral space of the electromagnet, and the peripheries of the armature and the armature lever are filled with liquid oil completely. The flat station is processed on the armature lever and the through hole is formed in the valve body, so that a liquid oil channel is formed in the electromagnetic type pressure regulating valve, air-liquid pressure fluctuation in the electromagnetic type pressure regulating valve is eliminated through liquid oil flowing, and the pressure regulating stability of the valve is ensured; in addition, the liquid oil can cool the electromagnet, and the life of the electromagnetic type pressure regulating valve can be prolonged.

The invention provides a pressure control system for an engine nozzle test. A pressure sensor is installed on the side, adjacent to a nozzle, of the back of a regulating valve and is arranged far from the nozzle. The pressure sensor is used for measuring the pressure of fuel oil entering the nozzle and synchronously feeding back measured values to a pressure controller in real time for comparison and calculation, and therefore the regulating valve can be regulated and closed-loop control can be achieved. A low-range pressure sensor and a high-range pressure sensor are arranged close to the nozzle respectively to measure the pressure on the inlet of the nozzle in a segmented mode. The pressure sensor is installed on the side, adjacent to the nozzle, of the back of the regulating valve and is arranged far from the nozzle, the measured values can be synchronously fed back to the controller in real time, so pressure regulation is free of overregulation and overshoot, interference of fluctuation of a spring in the nozzle in pressure measurement in a feedback link is avoided, and regulation stability is greatly improved. The two high-accuracy pressure sensors, namely the low-range pressure sensor and the high-range pressure sensor, are used for measuring the pressure on the inlet of the nozzle in a segmented mode, so pressure display is accurate, and work efficiency is improved.

A bidirectional differential-motion proportional pressure regulating mechanism comprises a fluid laminar flow implementing mechanism, a first pressure measuring point, a second pressure measuring point and a pressure measuring point position regulating mechanism. The fluid laminar flow implementing mechanism comprises a valve core and a valve sleeve, wherein an oil inlet, a first oil outlet and a second oil outlet are formed in the valve sleeve, and the oil inlet is arranged between the first oil outlet and the second oil outlet. Working steps matched with the inner diameter of the valve sleeve are arranged at two ends of the valve core, and the clearances of the working steps of the valve core and the valve sleeve are communicated with the oil inlet, the first oil outlet and the second oil outlet. The first pressure measuring point and the second pressure measuring point are both pressure measuring holes penetrating through the valve sleeve, and the pressure measuring holes are communicated with the clearances. The pressure measuring point position regulating mechanism comprises the valve core and a pushing component pushing the valve core to move inside the valve sleeve, and the movement of the valve core enables an L1 and an L2 to change between 0 and L. The bidirectional differential-motion proportional pressure regulating mechanism has the advantages that bidirectional rectilinear motion is adopted to achieve bidirectional differential-motion proportional stable pressure regulating, and control sensitivity is high.

A pressure regulating mechanism capable of setting an initial pressure comprises a fluid layer flow achieving mechanism, a pressure measuring point and a pressure measuring point position regulating mechanism. The fluid layer flow achieving mechanism comprises a valve core and a valve sleeve. A boss is arranged on an end face, towards one side of an oil outlet, of the valve core. A through groove is formed in the side wall of the valve core in the axial direction, and extends to the front end of the boss. A gap of the through groove of the valve core and the valve sleeve is communicated with an oil inlet and the oil outlet. Fluid in the gap is in a layer flow flowing state in a flowing mode. Pressure distribution of the oil inlet and the oil outlet is in a stable linear distribution. The pressure measuring point is a pressure measuring hole penetrating through the valve sleeve. The pressure measuring hole is communicated with the hole. The pressure measuring point position regulating mechanism comprises the valve core and a pushing component which pushes the valve core to move in the valve sleeve. The length of the boss can be regulated according to the actual needs and the initial pressure of the pressure regulating mechanism can also be set according to actual needs, pressure regulating is stable, control sensitivity is high, and processing difficulty is low.

A bidirectional dual-redundancy proportional pressure regulating mechanism comprises a fluid laminar flow implementing mechanism, a first pressure measuring point, a second pressure measuring point and a pressure measuring point position regulating mechanism. The fluid laminar flow implementing mechanism comprises a valve core and a valve sleeve, wherein an oil inlet, a first oil outlet and a second oil outlet are formed in the valve sleeve, and the oil inlet is arranged between the first oil outlet and the second oil outlet. Working steps matched with the inner diameter of the valve sleeve are arranged at two ends of the valve core, and two notches are axially formed in the side wall of each working step. The first pressure measuring point and the second pressure measuring point are both pressure measuring holes penetrating through the valve sleeve, and the pressure measuring holes are communicated with clearances. The pressure measuring point position regulating mechanism comprises the valve core and a pushing component pushing the valve core to move inside the valve sleeve. The bidirectional dual-redundancy proportional pressure regulating mechanism has the advantages that a double-flow-passage structure is adopted, even if one of the flow passages is blocked, the pressure regulating mechanism can still work normally, the problem that a pressure regulating mechanism is easy to block is effectively solved, and pressure regulating is stable.

The invention provides a portable small-flow precise pressure regulating device. The portable small-flow precise pressure regulating device comprises an upper shell assembly, a precise pressure regulating assembly and a lower shell assembly. The upper shell assembly comprises a screw, an upper shell and a screw connecting part. The precise pressure regulating assembly comprises a first spring, aninner liner, a positioning base, a lower spring, a third gasket, a diaphragm, a limiting ring, an outer liner, a check block, an upper spring, an upper valve and a lower valve. The lower shell assembly comprises a lower shell, a first filler neck, a nut, a nozzle, a first gasket, a second filler neck and a second gasket. Precise pressure regulating of multiple media under different working conditions is achieved, and the portable small-flow precise pressure regulating device has the beneficial effects that the structure is relatively simple, output pressure is stable, and regulating is precise.

A variable displacement oil pump capable of avoiding temperature rise and pressure drop relates to the technical field of oil pumps and comprises a pump body, a pump cover, a sliding block arranged in the pump body, a rotor, a pump shaft and the like, the front side of the sliding block is connected with the inner wall of the pump body through a rotating pin, the rear side of the sliding block is connected with the pump body through a spring, and a feedback cavity is formed between the left side face of the sliding block and the inner wall of the pump body. A low-pressure oil suction cavity is formed in the right side of the sliding block, a compensation oil channel is connected between the feedback cavity and the low-pressure oil suction cavity, a compensation pin is installed in the compensation oil channel in a clearance mode, and the compensation pin is used for guiding feedback oil to pass through the clearance between the side wall face of the compensation pin and the inner wall face of the compensation oil channel. Oil liquid in the feedback cavity is distributed, and oil liquid leaking into the feedback cavity from a high-pressure oil discharging cavity in the pump cavity under the high-temperature working condition is compensated and balanced, so that the stability of pressure adjustment of the whole system is guaranteed.

The invention discloses a hydraulic artificial muscle hydraulic drive and control system, comprising a motor, a hydraulic pump, a water tank, a filter, an overflow valve, a one-way valve, a normally-open proportional throttle valve, a throttle valve and a hydraulic artificial muscle drive. The throttle valve is separately connected with the normally-open proportional throttle valve and the hydraulic artificial muscle drive, and the throttle valve together with the normally-open proportional throttle valve forms a B-shaped half bridge. Through the bridge formed by the normally-open proportional throttle valve and the adjusted throttle valve, pressure of the hydraulic artificial muscle drive being adjusted by the proportional throttle valve, the invention achieves control to the output force and placement of the hydraulic artificial muscle drive, suitable for control to a manipulator's joint driven by a hydraulic artificial muscle. The invention utilizes a hydraulic half bridge formed by a proportional throttle valve and an adjusted throttle valve to control the driving pressure of a hydraulic artificial muscle, and thereby, performance requirements to the hydraulic elements are reduced, and there's no need to install a proportional pressure-reducing valve. Furthermore, the system has the advantages of stable pressure adjustment, wide range and nice linearity.

The invention discloses a special air pressure regulating device for extrusion forming of a sealing strip. The special air pressure regulating device for extrusion forming of the sealing strip comprises a control box, the control box comprises a support and a mounting plate, a box body is formed by the mounting plate and the support in an enclosed mode, an air pressure regulating system is installed in the box body, the air pressure regulating system comprises a precision pressure reducing valve, an inlet of the precision pressure reducing valve is connected with a pressure reducing valve, theother end of the pressure reducing valve is connected with an air storage tank, and the air storage tank is connected with a pneumatic triple part. An outlet of the precision pressure reducing valveis connected with a throttling valve, and an outlet of the throttling valve is connected with an extrusion die port through an air pipe. The special air pressure regulating device for extrusion forming of the sealing strip has the advantages of providing accurate and stable air pressure and achieving convenient pressure adjusting.

The invention discloses a vacuum-based saline solution heat pump regeneration pump which is composed of a vacuum maintaining mechanism, a water catching cold source cycle, a regenerated heat source cycle, a dilute solution supply mechanism, a condensed water drainage mechanism and a regenerated solution drainage mechanism. The vacuum maintaining mechanism comprises an air cylinder, a piston, a water catcher, a first water retaining gate, a regenerator, a regenerated solution tank, a condensed water tank, a heavy tray, a connection rod, a one-way valve and an electromagnetic valve. The water catching cold source cycle comprises a heat pump unit, a second heat regenerator, an electromagnetic valve and a stop valve. The regenerated heat source cycle comprises a first heat regenerator, an electromagnetic valve and a stop valve. The condensed water drainage mechanism comprises a condensed water tank, a one-way valve, an electromagnetic valve and a second water retaining gate. One heat pump set is adopted as cold and heat sources, two effects are achieved, energy is saved, and the structure is compact. In the drainage aspect of condensed water and a regenerated solution, the condensed water and the regenerated solution can be drained out of the system without pressure difference through the valves and other control.