97 results about "Overall efficiency" patented technology

The invention discloses a new energy automobile speed reducer efficiency optimization system based on multi-physics field coupling, and belongs to the technical field of new energy automobiles. The system constructs a structure-heat-fluid multi-physics field intensity coupling simulation model: firstly, the structure-heat model calculates friction heat generated by gear engagement based on a finite element method; then, the heat source is input into a heat-fluid sub-model to calculate a whole machine temperature field and oil stirring loss; the key point is that the temperature field can perform bidirectional feedback to update material attributes, lubricating oil viscosity and thermal deformation in real time, and a high-fidelity coupling solution is obtained through iterative solution. Based on the precise model, the system adopts intelligent optimization methods such as a genetic algorithm to carry out iterative optimization on variables such as gear parameters or lubricating oil viscosity, and outputs a design combination enabling the comprehensive efficiency to be optimal. According to the invention, the strong coupling effect among force-heat-fluid is accurately simulated, the deviation of traditional decoupling analysis is overcome, and the efficiency of the speed reducer and the energy efficiency of the whole vehicle can be systematically improved.

The invention discloses a gas turbine exhaust temperature control method and system, and relates to the technical field of gas turbines.The method comprises the steps that operation data of a gas turbine unit are collected, and the generating efficiency of the unit is calculated in real time; according to the starting condition of IGV temperature control reference correction, whether the unit load triggers IGV temperature control reference correction logic or not is judged; and based on IGV temperature control reference correction logic, the IGV temperature control reference is dynamically adjusted, and the turbine exhaust temperature is controlled. According to the method, the generating efficiency of the unit is calculated in real time and compared with a historical efficiency value, the IGV temperature control reference correction is dynamically adjusted, so that the turbine exhaust temperature is always close to the optimal value within a safe range, the output matching degree of a gas turbine and a steam turbine is improved, and therefore the overall efficiency of the combined cycle unit is improved; and by setting a manual switching mechanism, an operator can disable a correction function at any time, a traditional control mode is recovered, and safe operation of the unit is prevented from being influenced when algorithm abnormity or extreme working conditions occur.

The invention belongs to the technical field of automation control, and particularly relates to an intelligent cutting control method and system for a PVC foam sheet, and the method comprises the following steps: collecting and preprocessing cutting working condition data, the cutting working condition data including the measurement current of a main shaft motor, the regional temperature in a saw blade protective cover and the current real-time feeding speed; performing moving average filtering on the measurement current to obtain smoothed spindle current; and a thermal viscous resistance index model is constructed, and a thermal viscous resistance index representing the saw blade adhesion risk degree is calculated according to the smoothed main shaft current, the rated working voltage of a system main shaft motor, the real-time feeding speed, the effective cutting sectional area and the area temperature. According to the invention, the phenomenon of serious tooth pasting is eliminated from the source, the smoothness and flatness of the cutting surface of the plate are ensured, the saw blade always works in a proper temperature interval, the service life of a cutter is obviously prolonged, and the overall efficiency of an automatic production line is improved.

The invention discloses an isobaric multi-stage flexible compressed air energy storage system and an operation strategy thereof, relates to the technical field of compressed air energy storage, solves the problems that an air storage device is poor in universality and cannot fundamentally achieve efficient and flexible operation under variable working conditions, and comprises a multi-stage compressor unit, a multi-stage expansion unit and an air storage unit. The multi-stage compressor unit is composed of a first compressor unit, a second compressor unit and a third compressor unit, and the multi-stage expansion unit is composed of a first expansion unit, a second expansion unit and a third expansion unit. Through the isobaric gas storage technology, the non-design working condition caused by the pressure change of the storage tank is eliminated, the compressor and the turbine always work near the optimal pressure ratio, through the multi-machine parallel flexible combination, each device can operate at an efficient point close to the rated power of the device, the low-efficiency problem that a large horse pulls a small trolley in a single large device is avoided, and the working efficiency of the whole device is improved. And the overall efficiency of the system is greatly improved.

The invention discloses a rapid fine regulation and control method and system for improving the efficiency level of a gas extraction pump, and relates to the technical field of gas extraction. Comprising the following steps: analyzing and constructing an efficiency evaluation coupling relational expression between the comprehensive efficiency and state parameters of the gas extraction pump; and the theoretical optimal liquid supply flow under the current working condition is determined, the maximum adjustment difference between the theoretical optimal liquid supply flow and the actual optimal liquid supply flow is calculated, and the liquid supply flow regulation and control interval is determined. The adjustment is carried out by taking the interval minimum value as the start and combining the initial adjustment step pitch of the set liquid supply flow according to the following logics: if the positive income is generated after the adjustment, the adjustment is continued based on the current step pitch until the scaling condition is met, and the adjustment is continued after the step pitch is scaled; and if no forward earnings exist, zooming the step pitch and adjusting the step pitch to the minimum step pitch, and finally taking the parameter for generating the forward earnings last time as a regulation and control target. According to the method, the gas extraction efficiency and the precision and flexibility of energy consumption optimization are improved.

The disclosure relates to the technical field of blow dryers, and in particular to a compact continuous high-speed blow dryer. By improving optimized design of an air duct, while a wind resistance coefficient of guide vanes is reduced, values of flow rates in paths can be ensured, so that a fluid can be led out of the air duct linearly and uniformly and a fan blade can operate stably. Auxiliary support structures such as a spring, bearings and an air guide pad further stabilize a position of the fan blade and avoid centrifugal vibration of the fan blade, which eventually reacts on a rotating shaft and affects rotational efficiency of the rotating shaft. Therefore, an operating environment of the fan blade is greatly improved, and overall efficiency of the fan is improved, Moreover, since the operating environment of the fan blade is optimized, stability of the fan is enhanced, and further, service life of the fan is prolonged.

The utility model belongs to the technical field of shaft production, and particularly relates to a regrinding device for shaft production, which comprises a shaft material body, and further comprises a chassis, a guide rod, a tailstock, a spring, a mounting frame, a clamping groove and a grinding plate which are arranged on one side of the shaft material body, the chassis is arranged on one side of the shaft material body, and the chassis is further connected with the surface of the guide rod in a sliding manner; according to the device, through the arrangement type combined structure of the grinding plates, assembling can be conducted according to shaft material bodies of different lengths, efficient regrinding work can be conducted on the surfaces of the shaft material bodies through the grinding plates, the time needed by regrinding can be greatly shortened, the working efficiency is improved, and the device is suitable for popularization and application. And when the grinding plate is disassembled and assembled, the purpose can be achieved only by sliding the grinding plate and the mounting frame, and the overall efficiency of regrinding is further improved.

A method of controlling a pumping stage of a fracturing fleet at a wellsite with at least two electric frac pumps to increase the efficiency of the electric frac pumps comprises communicating an interim flowrate to the electric frac pumps and calculating an efficiency value from measured power from the VFD and measured flow rate, intake pressure, and discharge pressure. The method can increase a total efficiency of the fracturing fleet above a threshold efficiency value by iterating the interim setpoint from a first interim setpoint to a second interim setpoint for the electric frac pumps, wherein the second interim setpoint decreases the flowrate to the less efficient electric frac pumps and increases the flowrate an equal amount to the more efficient electric frac pumps.

The utility model relates to the technical field of denitration provides a kind of booster fan for denitration, including base, the top of base is provided with machine shell, the side of machine shell is provided with motor, the side of machine shell away from motor is provided with air intake, the end of air intake away from motor is provided with air intake pipe, the end of air intake pipe away from air intake is provided with clamping pipe, the side wall of clamping pipe is symmetrically provided with link component, the side wall of link component is provided with second recess, the inside of second recess is provided with clamping shaft, clamping shaft is provided with buckle;By moving the buckle designed on clamping pipe, make it and the first recess on the side wall of air intake pipe disengage tight engagement state, it can easily realize the steady and rapid separation of clamping pipe and air intake pipe, this design simplifies the disassembly process, improves the overall efficiency of maintenance work, ensures that booster fan can be completed in shorter time overhaul, quickly restore efficient operation, effectively reduce downtime, provide strong guarantee for the continuous and stable operation of equipment.

The application discloses a compressor, which comprises a cylinder, a moving blade, a variable-diameter ring and an adjusting assembly. An inner wall surface of the cylinder is provided with an annular groove. The moving blade is rotatably arranged in the cylinder. The variable-diameter ring is arranged in the annular groove. The variable-diameter ring comprises a plurality of adjusting members and an elastic sealing member. The adjusting members are arranged at intervals along the circumference of the cylinder. One end of the elastic sealing member is connected with one of the two adjacent adjusting members, and the other end of the elastic sealing member is connected with the other of the two adjacent adjusting members. The variable-diameter ring is arranged opposite to the blade tip of the moving blade and has a gap. The adjusting assembly is used for adjusting the position of the adjusting members in the radial direction of the cylinder, so as to change the gap size between the variable-diameter ring and the blade tip of the moving blade. The application guarantees the wear compensation during the operation of the compressor, avoids the defect that the traditional abradable coating cannot be recovered, and improves the overall efficiency and reliability of the gas turbine.

The application provides a winter anti-freezing device for a wet cooling tower and a control method thereof, relates to the technical field of cooling towers, and comprises a bypass pipe connected with a tower pipe on a main pipe, a bypass shutoff valve and a bypass flow adjusting valve arranged on the bypass pipe along the water flow direction, and a double-ring distribution pipe assembly connected with a water outlet end of the bypass pipe; a louver assembly is arranged in the circumferential direction at the air inlet of the cooling tower, a driving mechanism is arranged on the louver assembly, and a thermometer is arranged at the louver assembly; the control method comprises the following steps: a controller collects real-time operation parameters, determines the current operation condition according to the parameters, controls the valves, and distributes the main pipe and the bypass flow of the circulating water; and the opening degree of the louver assembly is controlled through the driving mechanism; the problems of poor anti-freezing effect of the wind shield, the lack of automatic adjusting capacity, flexible control, the reduction of unit back pressure, the reduction of cold end loss, the improvement of the overall efficiency of a thermal power generation enterprise, the adaptation to the flexibility requirement of the unit, and the technical effect of preventing the wet cooling tower from freezing are solved.

The utility model relates to the technical field of mining production, in particular to a three-way air door for non-coal mine mining, and aims to solve the problems that in the drift mining process of a non-coal mine at present, the overall dispatching efficiency of mining is greatly influenced due to the fact that the three-way air door which is generally adopted is limited in ventilation capacity, short in drift length and large in drift number. An air door on one side of the three-way air door is connected with an exhaust fan through a hard air duct, two air doors on the other side of the three-way air door are connected into two mechanical mining access paths through hard air ducts respectively, ventilation air paths of the three-way air door are switched in real time through movement of the air blocking door, alternate ventilation and dust removal of the two access paths are achieved, the length of the access paths can be increased, and the service life of the three-way air door is prolonged. And the wind blocking door is driven by external power to rotate and displace under the action of the movable screw rod, so that in the long-route mechanical mining process, the machine retreating distance during equipment transition is effectively shortened, and the overall mining efficiency and management scientificity are further improved.

The invention discloses a method, device and equipment for determining the double-pump displacement of an electric drive system and a storage medium, and belongs to the technical field of electric drive system control. The method comprises the steps that a first mapping relation between time and total required flow under a preset working condition is determined, and the total flow comprises cooling liquid required flow and lubricating liquid required flow; according to the first mapping relation, the first maximum rotating speed of the first oil pump and the second maximum rotating speed of the second oil pump, multiple target displacement combinations of the first oil pump and the second oil pump are determined; according to a second mapping relation among the flow, the pressure and the total efficiency of the first oil pump and a third mapping relation among the flow, the pressure and the total efficiency of the second oil pump, the power consumption of each group of target displacement combination is determined; and the target displacement combination with the minimum power consumption is determined as the displacement of the first oil pump and the second oil pump. According to the scheme, the optimal displacement combination of the two oil pumps can be designed, and then the power consumption of the electric drive system with the double pumps is reduced.

The present application belongs to the technical field of aviation turbine engine, and discloses an intercooling regenerative water enhanced turbofan engine, which comprises a Brayton cycle and a supercritical water vapor Rankine cycle in a main flow path, the two cycles are closely related, and are coupled by increasing a steam turbine, a steam generator and a condenser. The steam turbine does work to supply a high-pressure compressor, and liquid water appears at the steam turbine outlet, the liquid water is injected into the high-low pressure compressor for intercooling, the intermediate temperature of the compressor is reduced, the power consumption of the compressor is reduced, the unit working medium thrust is improved, the intercooler is saved, and the application is facilitated, the low-temperature steam at the steam turbine outlet can be injected into the low-pressure turbine inlet for cooling, and the cold air amount can be effectively reduced and the unit working medium thrust can be improved. The present application effectively overcomes the high temperature difference and large loss of the steam generator, compared with the conventional aviation engine, the total efficiency of the engine can be greatly improved, the fuel consumption rate and the pollutant emission are reduced.

The invention discloses an automatic press fitting device and method for a gear pump shaft sleeve, and relates to the technical field of shaft sleeve press fitting. The automatic press-fitting device and method for the gear pump shaft sleeve comprise a press-fitting machine body and a pressing plate installed on the press-fitting machine body and driven by a hydraulic unit, and a feeding assembly used for feeding the shaft sleeve and a rotating shaft, a moving assembly driving the rotating shaft to move and an adjusting assembly changing the concentricity rate of the shaft sleeve and the rotating shaft are arranged in the press-fitting machine body. The moving assembly comprises a power push rod which is fixed in the pressing machine body and provides power for the movement of the rotating shaft; the sliding seat is arranged in the pressing machine body in a sliding manner and drives the rotating shaft to move under the driving of the power push rod; therefore, the overall efficiency of a production line is remarkably improved, high consistency can be kept in each operation, accurate alignment of the shaft sleeve and the rotating shaft is ensured, and the assembly quality of each product is guaranteed.

The utility model discloses a ferrite steel drop hammer impact test's feeding device, including base, the upper end of base is installed hammer drop testing machine, a plurality of sample anvil are fixed with in the bottom of hammer drop testing machine, one side of base is installed two support rods, the upper end one side of support rod is rotatably connected with the cylinder, the piston rod end of two cylinders rotatably connected with the bearing plate in common, the bearing plate is fixed with the feeding frame, four stoppers are installed on the feeding frame with equal interval, and two stoppers are a group, and two groups of stoppers are staggered arrangement. Compared with traditional manual feeding mode, the automatic feeding reduces the link of manual intervention, greatly shortens the feeding time, improves the overall efficiency of test, in addition can satisfy the feeding demand of various types of sample, improves the versatility and applicability of feeding device, can also effectively avoid the damage to feeding frame due to the operation mistake, guarantees the safety of equipment and operating personnel.

The utility model relates to the technical field of water conservancy projects, and discloses a water conservancy project pipeline mounting and supporting device which is provided with an expansion mechanism and a fixing mechanism, the expansion mechanism is used for increasing the contact area with a pipeline, and the fixing mechanism is used for fixing the pipeline, so that the problem that in the current water conservancy project practice, the pipeline cannot be fixed easily is solved. In the prior art, a universal supporting device specially designed for supporting installation of pipelines with different sizes and lengths is lacked, so that in the actual construction process, when the pipelines with various specifications face, temporary building or customization solutions are often needed, the construction difficulty and cost are increased, and the construction period is shortened. In the prior art, the overall efficiency and safety of a project are affected, a traditional pipeline installation method generally can only adapt to pipelines with specific sizes, and additional time and resources are needed to adjust an existing supporting structure once the size or length of the pipelines exceeding an expected range is met.

The application aims to provide a compressor aerodynamic performance analysis method, an analysis system and a medium. The compressor aerodynamic performance analysis method comprises the following steps: obtaining a design value of the overall efficiency of the compressor; obtaining an over-limit value and a design value of the tip clearance of the rotor blade of any specified stage of the compressor; obtaining an efficiency difference value when the tip clearance is the over-limit value and the design value; calculating a third efficiency value when the tip clearance is the design value, so that the actual efficiency is equal to the difference between the third efficiency value and the efficiency difference value, and recording the outlet temperature calculation amount; obtaining the compressor outlet temperature calculation amount according to the outlet temperature calculation amount; and obtaining the actual overall efficiency of the compressor when the tip clearance of the rotor blade of the specified stage is the over-limit value according to the compressor outlet temperature calculation amount. The compressor aerodynamic performance analysis method can improve the efficiency and accuracy of analyzing the influence of the tip clearance change of the multistage axial flow compressor on the performance.

The invention discloses a feeding mechanism in the round steel straightening production process and a positioning method of the feeding mechanism, and relates to the technical field of straightening workpiece conveying, the feeding mechanism comprises a first vertical plate, a bottom connecting rod and a second vertical plate, the two ends of the bottom connecting rod are fixedly connected with the first vertical plate and the second vertical plate respectively, and the second vertical plate is fixedly connected to a straightening machine; a collaborative feeding chain is formed through the material storage slope, the follow-up feeding assembly and the crank rocker feeding assembly, full-automatic and continuous operation of round steel can be achieved in all stages of arrangement, material taking, transferring and pushing, the follow-up feeding assembly and a crank rocker mechanism have a mechanical linkage relation, the mechanical linkage relation between the follow-up feeding assembly and the crank rocker mechanism is achieved, and therefore the round steel can be automatically and continuously conveyed. The synchronous action can be realized after the driving motor drives the reduction gear, so that the next round steel can be automatically extracted in each material pushing cycle, the stability and efficiency of the feeding rhythm are improved, pause and non-uniformity caused by manual intervention are avoided, and the overall efficiency of straightening production is obviously improved.

The utility model discloses a large single-stage shield pump with a balance disc structure. The large single-stage shield pump comprises a front balance disc mechanism, a motor high-pressure outer circulation structure and a main shaft. According to the large-scale single-stage shield pump with the balance disc structure, a medium in a high-pressure area reaches the front of the balance disc through the gap between the impeller and the balance plate, pushes away the balance disc and then flows to the inlet direction, the force for pushing the balance disc is counteracted with the axial force generated by the pump, and the effect of completely balancing the axial force is achieved. The whole structure does not have a fine machining size or sensitive gap which is particularly accurate, so that various high-risk media which are highly corrosive or contain trace particles can be easily handled; due to the pressurization effect of the auxiliary impeller, a flow outlet of motor circulation can be selected as a pump body outlet, the possibility of cavitation is avoided, the motor circulation flow is converged into the outlet flow, the motor circulation flow is reasonably utilized, and the overall efficiency of the pump is improved.

The utility model discloses a multi-station petroleum piece machining hydraulic clamp, which belongs to the technical field of machining and comprises a base, a motor is arranged at the bottom of one end of the base, a turntable is arranged at the output end of the motor, a first connecting disc is arranged on one side of the turntable, and an adjusting component is arranged on one side of the first connecting disc. According to the device, the driving gear can be driven to rotate by rotating the rotary knob, so that the placement table on the driven gear is driven to rotate, and the petroleum piece can be driven to rotate on the bridge plate, so that the petroleum piece on the bridge plate can be adjusted in multiple directions, three-face machining of the petroleum piece is achieved, the number of procedures is reduced, and the machining efficiency is improved. By means of the device, the tool replacement frequency is reduced, most machining of petroleum pieces can be completed on one device, the production process is simplified, the machining continuity and the overall efficiency are improved, meanwhile, the device input cost is reduced, and production tasks can be completed without multiple devices and multiple procedures.

To provide a compact, sustainable, high-speed blower that improves overall efficiency, stability, and service life. [Solution] With respect to the blower, by improving the optimized design of the air tube, the wind resistance coefficient of the guide vanes can be reduced while simultaneously ensuring a large value for the flow rate in the path, promoting the linear and uniform extraction of fluid from the air tube, allowing the fan 4 to operate stably. Support auxiliary structures such as the spring 26, bearing 22, and air guide pad further stabilize the position of the fan, preventing centrifugal vibration of the fan from reacting with the rotating shaft 21 and affecting the rotation efficiency of the rotating shaft, thereby greatly improving the operating environment of the fan.

The application relates to the field of ball mill feeding equipment, in particular to a funnel for adding steel balls to a ball mill and a use method, wherein the funnel for adding steel balls to the ball mill comprises a funnel, a cone seat, the funnel is arranged at the feeding end of a feeding pipe fixed at the feeding end of the ball mill, the cone seat is arranged at the discharging end of the funnel, a material cavity is arranged at the joint of the cone seat and the funnel, the material cavity is provided with a first discharging groove in communication with the interior of the funnel and a discharging groove in communication with the feeding pipe, the cone seat is raised along the central axis of the feeding pipe to open the first discharging groove and close the discharging groove, and the cone seat is lowered along the central axis of the feeding pipe to open the discharging groove and close the first discharging groove. The feeding mechanism capable of being opened and closed in the lifting mode is provided through the arranged material cavity, so that the feeding is completed in the mechanical feeding mode, the controllability of the feeding amount is guaranteed, and the overall efficiency is higher compared with manual operation.

The utility model discloses a double-shell multistage centrifugal pump, an inner shell is formed by enclosing a first shell and a second shell which are detachable and is arranged in an outer shell, a rotor part is arranged in the inner shell, and the first shell and the second shell are detached, so that the whole rotor part can be taken out and is convenient to disassemble, assemble and maintain; a first-stage impeller in the rotor component is composed of double-suction impellers, the inlet flow speed of fluid can be reduced so as to improve the cavitation resistance, then the first-stage impeller is matched with a first set of impellers and a second set of impellers which are composed of symmetrically-distributed single-suction impellers, the hydraulic loss in the pump can be reduced, and therefore the overall efficiency of the pump is improved, and the axial force is balanced; a transition flow channel formed in the inner shell is of a symmetrical double-volute structure, the structure is simple, the casting cost is low, fluid can be evenly distributed into the two volutes, radial force is effectively reduced and balanced, noise and vibration of the pump are reduced, non-uniformity of fluid flowing is reduced, and the efficiency of the pump and the operation stability and reliability of the pump are improved.

The application discloses a turbine inter-stage sealing structure with honeycomb sealing and a gas turbine, and belongs to the field of gas turbines. The turbine inter-stage sealing structure with honeycomb sealing comprises a turbine moving disc and a turbine static disc, a gap is arranged between the turbine moving disc and the turbine static disc, a radial sealing structure is arranged between the turbine moving disc and the turbine static disc, the radial sealing structure comprises two honeycomb cavity structures arranged on the turbine moving disc and the turbine static disc respectively, the two honeycomb cavity structures are arranged along the circumferences of the turbine moving disc and the turbine static disc respectively, the inlets of the two honeycomb cavity structures are opposite to the directions of high-temperature gas flow, the honeycomb cavity structures are used for increasing the flow resistance of the gas flow, and the honeycomb cavity structures are used for inhibiting the gas invasion phenomenon. Meanwhile, the honeycomb structure is used for maximizing the cavity space for vortex dissipation, and the honeycomb structure has excellent geometric mechanical properties, the mass of the turbine disc is reduced, and the overall structural strength is not reduced. The application can reduce the minimum sealing flow and improve the overall efficiency of the gas turbine.

The utility model relates to the technical field of rubber strip deformation prevention, in particular to a U-shaped jacking iron putty type rubber strip deformation prevention protection structure which comprises two jacking pipes, a connecting pipe is arranged between the two jacking pipes, fixing grooves are formed in the two ends of the connecting pipe, sealing rubber strips are arranged in the fixing grooves, and the jacking pipes and the connecting pipe are connected through a connecting mechanism. A buffer mechanism is further arranged on the connecting pipe, the connecting mechanism comprises a clamping block, a third spring, a sliding plate and a clamping base, and a clamping groove matched with the clamping block is formed in the outer surface of the top pipe. According to the utility model, the extrusion force generated in the pushing process of the jacking pipe can be absorbed, and the force transmitted to the interface is reduced, so that the sealing rubber strip is prevented from being excessively extruded, the durability of the sealing rubber strip is improved, the leakage of water, gas or other substances is prevented, and the maintenance work required by sealing failure is reduced; and the later maintenance cost and shutdown time are reduced, meanwhile, the overall efficiency of pipe jacking construction is improved, and construction delay caused by the sealing problem of the connector is reduced.

The invention relates to the technical field of hydraulic driving equipment, in particular to a wheel excavator load-sensitive hydraulic system optimization control method and system.The method includes the following steps that hydraulic cylinder A and B cavity pressure and piston displacement are collected, the pressure difference and the displacement change rate are calculated, inertia response factors are analyzed, the acceleration change rate of a piston is detected, and a variable damping valve is adjusted; according to the method, the hydraulic system is accurately and dynamically controlled, energy distribution and system coordination are optimized, the pressure difference and the displacement change rate are calculated in real time, the load inertia level is recognized, and the pressure fluctuation mean square error is calculated. The through-flow section of the variable damping valve is dynamically adjusted; the damping change is optimized; the main pump flow and the throttling branch flow are accurately adjusted; the pressure fluctuation is reduced;

The invention relates to the technical field of roof bolter combination machines, in particular to a self-balancing roof bolter combination machine frame which comprises a large lifting arm, a drill arm turnover frame, a lifting oil cylinder and a sliding trolley and further comprises a linkage oil cylinder, and the two ends of the linkage oil cylinder are hinged to the large lifting arm and the sliding trolley respectively. The two ends of the self-balancing oil cylinder are hinged to the large lifting arm and the drill arm overturning frame respectively. The linkage oil cylinder is hydraulically connected with the self-balancing oil cylinder in series; when the lifting big arm moves, the self-balancing oil cylinder is driven to synchronously act through the extension and retraction of the linkage oil cylinder, so that the drill arm overturning frame and the anchor rod drilling machine on the drill arm overturning frame are kept in a vertical working state; through hydraulic series connection of the linkage oil cylinder and the self-balancing oil cylinder, the drill arm overturning frame is automatically driven to adjust the posture when the large lifting arm moves, so that the anchor rod drilling machine is always kept in a vertical working state, manual secondary posture adjustment is not needed, the operation process is simplified, the positioning time is greatly shortened, and the overall efficiency of roadway supporting or tunnel construction is improved.

The utility model provides a compression mechanism, a compressor and refrigeration equipment. The compression mechanism comprises a movable disc and a movable disc, the static disc assembly and the movable disc form a compression cavity, and the static disc assembly comprises a bypass cavity; the bypass structure is arranged on the static disc assembly or the movable disc, and the compression cavity can communicate with the bypass cavity through the bypass structure; wherein the bypass structure comprises a first bypass hole, at least one part of the first bypass hole extends in the circumferential direction of the compression mechanism, and / or the bypass structure comprises a plurality of second bypass holes, and the multiple second bypass holes are distributed in the circumferential direction of the compression mechanism, that is, the circulation sectional area of the bypass structure is increased by increasing the circumferential size of the bypass structure; therefore, when the compressor operates under the bypass working condition, the fluid resistance can be reduced, the power loss is reduced, and the overall efficiency of the compressor under the bypass working condition is improved.

The utility model discloses an air guide ring capable of improving the efficiency of a fan, which comprises an air duct continuously arranged around the central axis of the air guide ring, a plurality of drainage grooves are uniformly distributed on the inner wall of the air duct, and the drainage grooves smoothly extend along the length direction of the air duct and are obliquely arranged relative to the central axis. According to the technical scheme, under the condition that the overall structure of the fan is not changed, the air volume loss is reduced only by changing the style of the air guide ring, the multiple inclined drainage grooves in the inner wall of the air duct are spirally distributed, airflow can be directionally guided, air resistance is reduced, the air volume is increased, turbulent flow interference is reduced, stable airflow conveying is ensured, and the service life of the fan is prolonged. And the overall efficiency of the fan is improved.