26results about How to "Avoid cavitation" patented technology

The vibration absorption device comprises a shell and a buffer piston which are coaxially arranged, the buffer piston is sleeved with the shell, and the vibration absorption device further comprises at least two buffer cavities, an oil inlet way and a balance valve which are distributed on the periphery of the buffer piston at intervals in the axial direction; the oil inlet path is arranged on the shell and is communicated with at least one buffer cavity; the buffer cavities are communicated through the balance valves, the balance valves are used for changing the communication relation between the buffer cavities according to the pressure difference between the buffer cavities, the buffer cavities can be communicated in time, the buffer cavities needing oil supplementing are subjected to oil supplementing, sudden pressure drop of the cavities is avoided, and the phenomena of negative pressure and cavitation are avoided. Damage to parts in the rock drill is reduced, and the vibration absorption effect is improved. The second aspect provides a rock drill comprising the vibration absorption device in the first aspect, an impact piston coaxially arranged in the buffer piston in a sliding mode, a bit shank coaxially arranged on the front side of the impact piston, and a plug buffer spacer bush arranged on the impact piston in a sleeving mode and located between the buffer piston and the bit shank.

The utility model discloses a diaphragm adjusting device of a diaphragm compressor under low-negative-pressure air inlet. The diaphragm adjusting device comprises a piston assembly, a crosshead assembly, an air distribution disc and an oil distribution disc. The three metal diaphragms are arranged between the gas side diaphragm cavity and the oil side diaphragm cavity in an overlapped mode, and the middle diaphragm is provided with a guide groove to be communicated with the leakage detection opening; the electromagnet is arranged on the surface layer, close to the diaphragm side, of the oil distribution disc; the piezoelectric ceramics are respectively fixed in the machine body assembly and are close to an upper dead center and a lower dead center of the crosshead assembly; the springs are fixed on the two sides of the machine body assembly, are insulated from the crosshead assembly and are used for triggering the piezoelectric ceramics; the electromagnets are electrically connected with the piezoelectric ceramics respectively; the switch is attracted and controlled by the electromagnet to switch on and off of a circuit; the slide rheostat is connected in series with the electromagnet to adjust the adsorption force; the spring impacts the piezoelectric ceramic when the crosshead assembly moves to the upper stop point and the lower stop point, current is excited to enable the electromagnet to attract the switch, and then power-on and power-off of the electromagnet are controlled.

The utility model discloses an underground drainage filter head, which relates to the technical field of drainage filter heads, and comprises a cylindrical shell, a balancing weight and a buoyancy piece, a joint is arranged at the center of the top of the shell, a plurality of water inlets are uniformly arranged on the side surface of the shell, the balancing weight is arranged at the center of the upper surface of the bottom of the shell, and the buoyancy piece is arranged at the bottom of the shell. The buoyancy piece is arranged on the upper surface of the top of the shell, and the buoyancy of the buoyancy piece, the shell and the balancing weight is smaller than the gravity of the buoyancy piece, the shell and the balancing weight; the buoyancy of the buoyancy piece, the shell and the balancing weight is smaller than the gravity of the buoyancy piece, the shell and the balancing weight, the shell falls to the water bottom after being placed in water, and due to the fact that the top is light and provided with the buoyancy piece, and the bottom is heavy and provided with the balancing weight, the water drainage device can vertically stand in the water and cannot topple over, the water drainage working effect is better, and the cavitation erosion phenomenon can be avoided.

The application discloses a flow-adjustable multi-stage throttling device and application thereof, wherein the device comprises a front flange pipeline, a flow-adjustable component and a rear flange pipeline, and the front flange pipeline and the rear flange pipeline are tightly connected; the flow-adjustable component comprises a plurality of adjustable orifice plate assemblies arranged in the inner cavity of the flange pipeline formed by the front flange pipeline and the rear flange pipeline; each adjustable orifice plate assembly comprises a sealing cover plate, a bottom plate, an adjusting rod, a rotating disc and a driver; the adjusting rod is arranged in the mounting hole of the bottom plate, the rotating disc is mounted on the bottom plate, the driver is mounted on the sealing cover plate, and the throttling hole of the sealing cover plate and the throttling hole of the bottom plate are communicated to form a throttling window; the driver is used for driving the rotating disc to rotate when rotating; the rotating disc is used for driving the adjusting rod to enter or exit the throttling window through the rotating wheel, so that the effective throttling area of the throttling window is changed. The application can actively and low-noise adjust the flow under different working conditions.

This invention discloses an integrated hydraulic system for a drive-and-recovery excavator and the excavator itself. The system includes: a first pump motor driven by a first motor, a second pump driven by a second motor, and a third pump driven by a third motor; the first pump motor is connected to a boom valve, which is connected to the boom cylinder; the second pump is connected to a boom regeneration valve, a boom valve, a bucket valve, and a stick valve; the boom regeneration valve is connected to the rodless chamber of the boom cylinder; the boom valve is connected to the boom cylinder; the rod chamber of the boom cylinder is connected to an oil tank via a check valve; the bucket valve is connected to the bucket cylinder; the stick valve is connected to the stick cylinder; and the third pump is connected to the stick valve, which is connected to the stick cylinder. This invention eliminates throttling losses caused by load differences during multi-actuator compound actions, achieves potential energy recovery during boom descent, improves the stability and flexibility of the boom descent process, and avoids cavitation.

The application belongs to the technical field of power generation, and particularly relates to a power supply device for automobile range extension, and more particularly to a direct-current power generation system and a working method thereof. The direct-current power generation system acquires the power of a power generation part in real time through a control module. When the power changes, the control module controls a pressurizing part to pressurize a power part cooling loop, and controls a connecting part to connect the power part cooling loop and the power generation part cooling loop, so that the high-pressure gas in the power part cooling loop enters the power generation part cooling loop, the gas pressure in the power generation part cooling loop is increased, the boiling point of the cooling liquid in the power generation part cooling loop is increased, and the cooling requirements of the power generation part and the power part are simultaneously met. When the power of the power generation part changes, the gas pressure in the power generation part cooling pipeline is increased, the boiling point of the cooling liquid therein is increased, and the cavitation effect caused by the local temperature rise and boiling of the cooling liquid due to the local eddy current caused by the power change is avoided.

The application belongs to the technical field of tailings conveying, and discloses a buffer type stirring and slurry mixing device for tailings grading conveying, which comprises a stirring outer tank, a buffer inner tank movably arranged in the stirring outer tank, an elastic support structure for suspending the buffer inner tank on the stirring outer tank, and a self-adapting water inlet assembly and a mixing and stirring assembly. The application effectively prevents overpressure of a conveying pump and pipeline blockage caused by too thick slurry, avoids insufficient strength and segregation and delamination of a filling body caused by too thin slurry, and greatly improves process stability and safety of a filling system.

The utility model discloses a kind of hydraulic equipment of turning and milling composite numerical control machine tool, it is related to numerical control machine tool technical field.The utility model includes hydraulic part, the hydraulic part is used to store hydraulic oil;Cooling part, the cooling part is installed above hydraulic part, the cooling part is used to cool hydraulic oil;And reject part, the reject part is installed inside hydraulic part, the reject part is used to filter hydraulic oil.The utility model is cooled by setting cooling box, specifically is that redundant hydraulic oil enters into overflow pipe, then again through overflow pipe into butt block, and enter inside cooling pipe, then start motor, motor starts to drive fan rotation, then again through fan rotation to suck the airflow outside to cooling box inside, then through the flow of airflow to cool the hydraulic oil inside cooling pipe, and re-enter hydraulic tank through discharge pipe, prevent backflow hydraulic oil because temperature is too high, make it appear cavity phenomenon.

The invention relates to the technical field of refrigeration transmission and distribution systems, and discloses a variable type super-efficient transmission and distribution refrigerating machine room which comprises a channel steel base, a softened water tank is fixedly installed on the channel steel base, a water inlet pipeline is fixedly connected to one side of the softened water tank, a transmission and distribution assembly is arranged on the channel steel base, and a water outlet pipeline is fixedly connected to the other side of the softened water tank. The transmission and distribution assembly comprises a positive displacement filter. According to the variable super-efficient transmission and distribution refrigerating machine room, in order to enable the device to adapt to dynamic requirements of refrigeration of various buildings, the transmission and distribution assembly is arranged, the effective filtering area of the assembly matched with a volumetric filter is larger than that of a traditional Y-shaped filter, water inlet resistance is greatly reduced, and the transmission and distribution assembly is matched with a first pressure transmitter, a second pressure transmitter, an electric blow-down valve and a rotary steel brush; automatic pressure difference detection and automatic dirt cleaning and discharging are achieved, cavitation of the water pump is avoided, the large end suction pump, the middle end suction pump and the small end suction pump convenient to disassemble are combined to form seven flow gears, stepless adjustment is achieved through fine adjustment of a frequency converter, and dynamic load changes are matched.

A novel hydraulic pump station for mining includes an oil tank, a frame, and a control valve assembly mounted on the oil tank. The oil tank is located on top of the frame, and an oil pump assembly is mounted on the frame directly below the oil tank. The interior of the oil tank is divided into a return oil zone and an intake oil zone by a partition. The oil inlet of the oil pump assembly is connected to the intake oil zone via an oil suction filter, and the oil outlet of the oil pump assembly is connected to the inlet of the control valve assembly via a two-stage high-pressure filter. Water coolers and spray mechanisms are installed on both the front and rear sides of the oil tank. The water inlet of the water cooler is connected to a mining static pressure water supply system, and the water outlet of the water cooler is connected to the water inlet of the spray mechanism. The oil inlet of the water cooler is connected to the return oil port of the control valve assembly, and the oil outlet of the water cooler is connected to the return oil zone via a return oil filter. This invention features a compact overall structure, meets the requirements for use in confined spaces, and offers high cooling efficiency.

This invention discloses a torque balancing device and an oil supply and return system, belonging to the technical field of submersion motion test equipment. The torque balancing device is installed on a submersion motion test bench, which includes a column, a platform located inside the column, a crossbeam fixed to the top of the column, and a lifting actuator fixed above the crossbeam. The movable end of the lifting actuator is connected to the platform. The torque balancing device is located between the column and the platform. It is used to counteract the overturning torque caused by the control error of the lifting actuator and the overturning torque caused by a malfunction in the control system of the submersion motion test bench, thus enabling the platform to move vertically along the column. The torque balancing device includes a torque balancing cylinder, a ball joint, and a hydrostatic support plate. The torque balancing cylinder is fixed to the corner beam of the platform, and the hydrostatic support plate is attached to the surface of the column. The piston rod of the torque balancing cylinder is connected to the ball head of the ball joint by screws, and the ball socket of the ball joint is connected to the hydrostatic support plate by screws.

This utility model discloses a modified plastic granule bagging device, including a storage bin. Three equidistant feeding hoppers are installed on the bottom outer wall of the storage bin. A circular discharge hood is installed at one end of the bottom of each feeding hopper. A motor is installed on one outer wall of the circular discharge hood, and a rotating rod is mounted on the output shaft of the motor. Six equidistant distributing plates are installed on the outer wall of the rotating rod. The outer wall of the distributing plates is fitted with a clearance fit to the inner wall of the circular discharge hood, and the clearance between the distributing plates and the inner wall of the circular discharge hood is less than the minimum particle radius. This utility model achieves linear speed regulation of the distributing plates, allowing the feeding speed to be precisely adjusted according to the bagging capacity requirements. The clearance fit between the six equidistant distributing plates and the inner wall of the circular discharge hood ensures that the material is evenly cut and pushed, avoiding local accumulation or cavities. Simultaneously, the six distributing plates and the inner wall of the discharge hood form a closed annular surface, quickly achieving physical material cutting and eliminating the delayed dripping problem of traditional gate-type interception devices.

The utility model relates to the technical fields of pump discloses a multistage centrifugal pump of anti cavitation, including low pressure section, high pressure section, pump shaft, pressure relief pipe and machine seal seat, low pressure section and high pressure section intercommunication form fluid cavity, machine seal seat connects in high pressure section far from low pressure section one side, and pump shaft is arranged in low pressure section, high pressure section and machine seal seat respectively, low pressure section is equipped with medium inlet and inducer room, and inducer room both ends are connected with medium inlet and fluid cavity communication respectively, and inducer room is equipped with inducer connected in pump shaft, and low pressure section is equipped with jet flow channel, and jet flow channel is connected with inducer room, and machine seal seat is equipped with pressure relief channel, and pressure relief channel is connected with fluid cavity in high pressure section far from low pressure section one side, and jet flow channel and pressure relief channel are connected through pressure relief pipe. The utility model discloses a multistage centrifugal pump of anti cavitation, and high pressure medium is introduced at inducer, avoids cavitation, and drives low pressure medium to accelerate flow.

This utility model discloses an automatic venting valve and a cavitation protection device for an unloading pump of a chemical liquid oil tanker. The cavitation protection device includes a buffer storage tank and an unloading pump. The buffer storage tank is equipped with a level gauge connected to a level transmitter, which is connected to the unloading pump. The buffer storage tank is connected to the tanker truck's quick-connect interface via the tanker truck's unloading pipeline, to the oil and gas recovery interface via a first gas phase pressure relief pipeline, and to the unloading pump via the unloading pump's inlet pipeline. The unloading pump's housing cavity is connected to the oil and gas recovery interface via a second gas phase pressure relief pipeline, and the unloading pump's output end is connected to the unloading outlet pipeline. Both the first and second gas phase pressure relief pipelines are equipped with a shut-off valve and a venting valve, with the venting valve located near the oil and gas recovery interface. This utility model can protect the tanker truck's unloading pump from cavitation, thereby improving its service life.

The utility model belongs to the field of medical apparatus and instruments, disclose a kind of medical catheter with coupling liquid compensation function, comprising: catheter seat is equipped with containing cavity, and catheter seat is equipped with injection hole, air hole and first passage;One end of outer catheter is sealedly connected with catheter seat, other end is closed, and outer catheter is communicated with containing cavity and forms second passage;Retracement component is movably arranged in second passage;First sealing ring is arranged in containing cavity;Second sealing ring is arranged in containing cavity;Third sealing ring is fixedly arranged in the outside of retracement component, and first sealing ring and the closed end of outer catheter form first sealed cavity, and second sealed cavity is formed between first sealing ring and third sealing ring, and third sealed cavity is formed between second sealing ring and third sealing ring;Injection hole is communicated with first sealed cavity, and air hole is communicated with second sealed cavity and atmosphere;The both ends of first passage are communicated with first sealed cavity and third sealed cavity respectively.The utility model can avoid the air bubble or deflation in catheter when retracting.

The application discloses a methanol unloading system, which comprises a liquid inlet pipeline, a liquid outlet pipeline, an unloading pump, a gas-liquid separation tank and a backflow pipeline; the liquid outlet end of the unloading pump is communicated with the gas-liquid separation tank through an exhaust pipeline; the gas-liquid separation tank is communicated with the liquid inlet end of the unloading pump through the backflow pipeline; a backflow valve is arranged at the connection position of the backflow pipeline and the gas-liquid separation tank; the system further comprises a liquid pumping pump, a liquid pumping inlet pipe and a liquid pumping outlet pipe; the liquid pumping inlet pipe is communicated between the backflow pipeline and the liquid inlet end of the liquid pumping pump; the liquid pumping outlet pipe is communicated between the liquid outlet end of the liquid pumping pump and the liquid outlet pipeline; a liquid pumping inlet valve is arranged on the liquid pumping inlet pipe; the system further comprises a backflow bypass pipeline, one end of the backflow bypass pipeline is communicated with the backflow pipeline and is provided with a bypass valve, and the end is located between the liquid pumping inlet valve and the backflow valve; the other end of the backflow bypass pipeline is communicated with the end of the backflow pipeline close to the unloading pump. By adding the additional liquid pumping pipeline and the liquid pumping pump, the dynamic change of the unloading working condition and the safety requirement can be adapted.

A multi-start carrier power system, the design includes the power system architecture of the main power module, the auxiliary power module and the supercharged delivery module, the reusable carrier power scheme, the unified propellant type used by the main and auxiliary power systems, the simplified carrier power system, the improved reusable maintenance of the carrier power system, the realization of the multi-start function and the start number not limited by the starting device, with the multi-start, multi-reuse ability, while reducing the difficulty of power architecture design, the internal design optimizes the layout space, which simplifies the ignition system, improves the ignition reliability and stability, and the ignition number is not limited.

The utility model discloses a closed recovery system for steam condensate. The closed recovery system comprises a recovery tank and a softened water tank, a condensate return pipe, a first blow-down pipe and a pressure relief pipe are connected to the top of the recovery tank, a safety valve is arranged on the first blow-down pipe, a first electric valve is arranged at the end, close to the recovery tank, of the pressure relief pipe, and the softened water tank is connected to the end, away from the recovery tank, of the pressure relief pipe; the bottom of the recycling tank is connected with a condensate recycling pipe and a discharging pipe, the condensate recycling pipe is provided with a boiler water feeding pump so as to supply recycled water to the boiler, the discharging pipe is provided with a discharging valve, and the recycling tank is further provided with a first liquid level meter; the lower portion of the softened water tank is connected with a water supplementing pipe, the other end of the water supplementing pipe is connected to the top of the recycling tank, and a water supplementing pump is arranged on the water supplementing pipe. The steam condensate closed recovery system provided by the utility model can automatically adjust and control water balance in the recovery tank, so that the problem that a water feeding pump of a boiler is easy to generate a cavitation phenomenon is solved.

An active cooling device for a dual-drive feed axis of a machine tool and its usage method are disclosed. The device includes a cooling circuit, a central controller, and sub-controllers. An exhaust mechanism is installed on the outer wall of the cooling circuit. A circulating pump is installed on the outer wall of the cooling circuit. A cooling plate is installed on the top of the cooling circuit. A stabilizing mechanism is installed on the outer wall of the cooling plate. A pressure gauge, a flow meter, and a proportional valve are sequentially installed on the outer wall of the cooling circuit from bottom to top. An intelligent temperature-controlled oil tank is connected to the outer wall of the cooling circuit at the end furthest from the cooling plate. The exhaust mechanism includes a lower guide pipe fixedly connected to the outer wall of the cooling circuit. An exhaust pipe is fixedly connected to the outer wall of the lower guide pipe at the end furthest from the cooling circuit. This invention effectively solves the problems of inaccurate temperature control and cavitation caused by air bubbles in the coolant in existing dual-drive feed axis cooling devices.

The present application relates to the technical field of water heaters, and discloses a production process of a water heater and the water heater, the production process of the water heater comprising the following steps: S1, foaming adhesive tape is sleeved in a shell of the water heater, and the foaming adhesive tape is stretched apart by a shape-following device, so that the foaming adhesive tape is attached to side walls of cavities formed between the shell and gaskets on end covers of the water heater; S2, an inner container is placed in the foaming adhesive tape and supported on the gaskets; and S3, foaming material is injected between the foaming adhesive tape and the inner container to perform foaming. The production process of the water heater has the advantages that the foaming adhesive tape is stretched apart by the shape-following device and attached to the side walls of the cavities, so that the foaming material can fill the cavities by gravity, the phenomenon of cavities is avoided, and in turn, the phenomenon of shell concave of the water heater is avoided. The water heater can avoid the cavities between the shell and the gaskets, improve the overall strength of the water heater, and avoid the phenomenon of shell concave caused by collision.

A multi-stage centrifugal pump with reduced cavitation, relates to a centrifugal pump, the multi-stage centrifugal pump suction pipe, cooling water cavity and suction section are connected by welding;Front pump cover (4) and winding pad (5) are installed on suction section component (11) through front pump cover fastener (29), which constitutes stator suction component;First stage impeller (28) and first stage impeller baffle (27) are installed on pump shaft (1) and penetrate into stator suction component assembly;Through the bar (8) through the suction section component (11) installation flat pad (10) and nut (9);First stage sealing pad (6) and sealing ring (12) are installed on the first stage middle section (7), and are installed with the stator suction component;The multi-stage centrifugal pump effectively avoids the occurrence of cavitation, ensures the safe and stable transportation of process medium close to the gasification point. It is suitable for the transportation of various media, especially for the transportation of process medium close to the gasification point.

The utility model discloses a streamline reinforced valve plate, relates to the technical field of valves, and solves the problems that a traditional valve plate is large in fluid impact, high in energy consumption, heavy in structure, easy to vibrate and the like. According to the technical scheme, the incident flow surface of the valve plate is designed to be a continuous and smooth asymmetric streamline curved surface, and the thickness is gradually increased from the incident flow end and then contracts towards the back flow end; the valve plate is of a hollow structure with the hollow interior, reinforcing ribs are arranged in the valve plate, the distribution density of the reinforcing ribs is gradually increased from the rotating center to the edge, the connecting position of the valve rod is the highest, and the cross section can be rectangular, round or triangular. The valve plate and the reinforcing ribs are integrally formed in a casting mode and are made of stainless steel or duplex stainless steel. The effects that fluid impact and energy consumption are remarkably reduced, cavitation and vibration are restrained, light weight and high structural reliability are achieved, and the service life is prolonged are achieved.

The invention relates to the technical field of hydroelectric power generation equipment, and discloses a design method for a water bucket of an ultrahigh water head impulse turbine, which comprises the following steps of: 1, accurately selecting a runner tangent circle radius P based on a correlation formula of a runner tangent circle relative radius and a runner relative diameter; and step 2, optimizing the normal abduction of the root molded line. Cavitation erosion in a water bucket notch area and a notch blade tip back area is avoided, and the root stress of the water bucket can be reduced.

The utility model discloses a valve sleeve type blow-down valve in the technical field of valves. The valve sleeve type blow-down valve comprises a valve body, the valve body comprises a feeding end and a discharging end, a valve cover is fixedly connected to the valve body, a valve sleeve is arranged in the valve cover, a material passing hole is formed in the valve sleeve, a valve element is arranged in the valve sleeve, the valve element is fixedly connected with a valve rod, and the valve rod extends out of the valve cover. The valve body is further detachably connected with a mounting plate, the mounting plate is close to the feeding end, the mounting plate is detachably connected with a filtering piece, and the filtering piece is located under the valve element. According to the blow-down valve in the scheme, sewage media can be filtered before entering the valve sleeve, large impurity particles are intercepted, the risk that the blow-down valve is blocked is further reduced, the filter part can be cleaned only by detaching the mounting plate from the valve body, and the maintenance efficiency of the blow-down valve is improved.

The invention relates to a gas injector for blowing in gaseous fuel, comprising: a magnetic actuator (2) having an armature (20), an inner pole (21) and a coil (22); a closing element (3) which releases and closes the gas path (14) on the sealing seat (11), the armature (20) being operatively connected to the closing element (3); a closed lubricant chamber (4), which is filled with a lubricant and in which the armature (20) is arranged in order to ensure lubrication of the armature; the closing element (3) has a lubricant chamber (4), and a damping device (6) which is arranged in the lubricant chamber (4), the damping device (6) being designed to damp a closing movement of the closing element (3), the damping device (6) having a damping piston (61), a damping housing (60), a throttle (62) and a damping chamber (63) formed in the damping housing (60), the damping chamber (63) has a throttle (62) which connects the damping chamber (63) to a compensation chamber (54), the throttle being arranged in the damping housing (60), and wherein a guide region (66) with a guide gap is formed between the damping piston (61) and the damping housing (60).

The application relates to the technical field of data center liquid cooling, and provides a liquid cooling energy distribution system and a control method thereof. The liquid cooling energy distribution system comprises a case, a primary side loop, a secondary side loop, a heat exchange module, an adjusting module and a control module. The heat exchange module has a flat structure and is internally provided with a plurality of parallel micro flow channels to reduce pressure drop. The actuator of the adjusting module is installed laterally offset in the horizontal direction. The control module is configured to acquire an environmental dew point parameter and a secondary side fluid temperature parameter and monitor the running state of a circulating pump. In response to determining that there is a risk of dewing and the circulating pump reaches a preset lower limit of safety, the control module controls the adjusting module to limit or cut off the primary side flow and maintains the circulating pump to run at the lower limit of safety. The application realizes high-throughput low-flow-resistance heat exchange and dewing prevention self-healing control in a compact space.