117results about How to "Improve volumetric efficiency" patented technology

The utility model relates to the technical field of hydraulic transmission, and discloses an oil distribution structure of a rotary oil distribution device, which comprises a static ring and a movable ring which are in radial running fit, the static ring is provided with a plurality of static ring oil holes for fluid media to circulate, and the movable ring is provided with movable ring oil holes corresponding to the static ring oil holes. The static ring and the moving ring are correspondingly provided with matched conical surfaces with the same taper, the static ring and the moving ring are in radial sliding fit through the matched conical surfaces, and the static ring and the moving ring are elastically connected through an elastic connecting piece. By arranging the oil distribution structure which is in conical surface fit and floating connection, machining and assembling errors and self-abrasion of all parts can be automatically compensated, a certain self-adaptive adjusting function is achieved, under the condition that sealing is not lost, the oil distribution efficiency and operation stability of the oil distribution device are guaranteed to the maximum extent, and the service life of the oil distribution device is prolonged. The oil distribution device can meet the use requirements of high-speed, high-pressure and large-flow working conditions, and fills the technical blank in the field of oil distribution devices under the high-speed, high-pressure and large-flow working conditions in China.

The utility model provides a double-cylinder double-stage compressor and a refrigerating system with the same, and belongs to the technical field of air conditioning, the double-cylinder double-stage compressor comprises a shell, a pump body assembly is arranged in the shell, the pump body assembly is provided with a reciprocating compression part and a rotary compression part, the rotary compression part comprises a roller, the reciprocating compression part comprises a piston, and the piston is arranged in the shell. The pump body assembly is further provided with a crankshaft, the crankshaft is further provided with a first eccentric part corresponding to the roller so as to drive the roller to rotate, and the crankshaft is provided with a second eccentric part corresponding to the piston so as to drive the piston to reciprocate. According to the reciprocating compressor, the crankshaft with the first eccentric part and the second eccentric part simultaneously drives the rotary compression part and the reciprocating compression part to compress, so that the advantages of compact structure of the reciprocating compressor and high volume efficiency of the rotary compressor can be considered; therefore, the whole structure of the double-cylinder double-stage compressor is compact, the volume efficiency is high, the whole energy efficiency of the compressor is improved, and the refrigerating capacity of the compressor is improved.

The invention discloses a low-pulsation axial plunger motor device without low-speed limitation, which comprises a shell (10) and a main shaft (7) arranged in the shell (10), a wheel disc (19) positioned in the middle of the shell (10) is arranged in the middle of the main shaft (7), plunger holes (21) which are uniformly distributed and staggered are formed in two ends of the wheel disc (19), plungers (6) are arranged in the plunger holes (21), and the plungers (6) are arranged in the plunger holes (21). The main shaft (7) is provided with two groups of limiting seats (20) which are symmetrically arranged relative to the wheel disc (19), floating cylinders (4) are arranged on the limiting seats (20) through cylinder seat pins (9), guide grooves (22) corresponding to the plungers (6) are formed in the sides, facing the wheel disc (19), of the floating cylinders (4), chucks (5) for limiting the floating cylinders (4) are arranged at the ends of the guide grooves (22), and limiting sleeves (3) are arranged on the other sides of the floating cylinders (4). The device has the advantages of low pulsation double amplitude and low-rotating-speed stable output.

The invention discloses a double-screw compressor rotor profile and a double-screw compressor, and belongs to the technical field of compressors, the rotor profile comprises a male rotor tooth curve and a female rotor tooth curve, the male rotor tooth curve comprises an A1B1 section, a B1C1 section, a C1D1 section, a D1E1 section, an E1F1 section, an F1G1 section, a G1H1 section and an H1I1 section which are sequentially and smoothly connected; the tooth curve of the female rotor comprises an A2B2 section, a B2C2 section, a C2D2 section, a D2E2 section, an E2F2 section, an F2G2 section, a G2H2 section and an H2I2 section which are sequentially and smoothly connected. The tooth curve of the male rotor is obtained by converting the rack line from a rack coordinate system to a tooth profile coordinate system of the male rotor; and the female rotor tooth curve is obtained by converting the rack line from the rack coordinate system to the tooth profile coordinate system of the female rotor. By means of the sectional tooth curve, the large calculation amount caused by directly optimizing the female rotor profile and the male rotor profile can be avoided, and therefore the design efficiency of the rotor profiles is improved.

The invention discloses a pump body assembly, a compressor and air conditioning equipment, and relates to the technical field of compressors, the pump body assembly comprises a first-stage cylinder body, the first-stage cylinder body is provided with a first-stage compression cavity, a first exhaust hole and a second exhaust hole, and the first exhaust hole and the second exhaust hole are formed in the cavity wall of the first-stage compression cavity in a spaced mode and communicate with the first-stage compression cavity; the cavity wall of the first-stage compression cavity is further provided with a first guide notch communicated with the edge of the first exhaust hole and a second guide notch communicated with the edge of the second exhaust hole, and the ratio of parameters (R1, D1, theta1 and L1) related to the first exhaust hole to parameters (R2, D2, theta2 and L2) related to the second exhaust hole is defined to be larger than or equal to 0.28 and smaller than or equal to 3.6, wherein (R1 * D12 * theta1 * L1) / (R2 * D22 * theta2 * L2). The two exhaust ports are optimized independently, it is guaranteed that the two exhaust back pressures in measurement are basically equal, synchronous exhaust is achieved, and therefore the performance of the compressor is improved.

The invention relates to the technical field of gears, in particular to a five-section type spiral gear for hydraulic equipment, which comprises a gear, the single tooth profile of the gear sequentially comprises an arc AB, a transition curve BC, an involute CC ', a transition curve B' C 'and an arc A' B 'from the tooth top to the tooth root, and the slope of the transition curve BC is monotonically decreased; each of the transition curve BC and the transition curve B 'C' comprises one of a Bayes curve, a high-order spline interpolation curve and an elliptic curve. Through the arrangement of the arcs AB and the arcs A 'B', the oil trapping problem can be effectively solved, and no extra influence is caused on gear meshing; through the arrangement of a transition curve BC and a transition curve B 'C', the tooth shape design of the gear can be flexibly adjusted according to actual use requirements; the performance of low vibration and low noise is achieved; and meanwhile, the situation that hydraulic equipment collides with one another can be avoided, and the use efficiency of the gear is effectively improved.

The invention belongs to the technical field of excavator power control, and particularly relates to an excavator constant power control method and system for improving the volume efficiency of an oil pump. The method comprises the steps that when the excavator enters a constant power mode, the current pump pressure and the current required displacement of a hydraulic oil pump under the target rotating speed of an engine are obtained, and required power is obtained through calculation; the ratio of the set power to the required power of the hydraulic oil pump serves as a first input value, and the calibrated minimum displacement of the hydraulic oil pump serves as a second input value; taking the ratio of the second input value to the first input value as an output value; calculating a final request rotating speed according to the ratio of the target rotating speed to the first output value, and adjusting the rotating speed of the engine to the calculated final request rotating speed; and the pump displacement of the hydraulic oil pump is adjusted in real time according to the set adjusting coefficient so as to adjust the actual flow of the pump. The pump displacement is improved by reducing the target rotating speed, the volume efficiency is improved by improving the pump displacement, and the purpose of reducing oil consumption is finally achieved.

The invention discloses a domestication method and device for salt-tolerant activated sludge, and belongs to the technical field of microculture and sewage treatment devices. In order to solve the technical problems that in the prior art, domestication of salt-tolerant activated sludge is achieved in the mode that salinity is increased in a gradient mode, obtained sludge is poor in genetic adaptability and long in domestication period, the domestication method of the salt-tolerant activated sludge comprises the steps that fresh sludge with the sludge concentration MLSS being 5000-6000 mg / L and the MLSS / MLVSS being larger than or equal to 0.8 is put into a domestication device; the domestication device comprises an anaerobic-anoxic reaction zone and an aerobic reaction zone which are communicated with each other; the concentration of salt in the system is controlled to be 3-5%, when the CODcr removal rate is smaller than or equal to 30%, the CODcr concentration gradient is gradually increased at the gradient of 500-1000 mg / L in the modes of increasing nutrition addition, increasing the aeration rate of the aerobic reaction zone, returning the sludge in the aerobic reaction zone to the anaerobic-anoxic reaction zone, supplementing fresh sludge, discharging inactivated sludge and the like, and the obtained salt-tolerant activated sludge is good in heredity and high in salt tolerance. And the domestication period is short.

The present invention discloses a two-stage compression vane vacuum pump with an asymmetric cylinder profile. The vacuum pump comprises a front cover (1), a rotor (2), a cylinder (3), a vane (4) and a rear cover (5). The contour profile of the cylinder (3) consists of five different curves, and the first-order derivative and the second-order derivative are continuous. During operation, two cavities with different volumes and asymmetry are formed between the front cover (1), the cylinder (3), the rear cover (5) and the rotor (2). The gas completes a primary compression process in the primary cavity (301) and then enters the secondary cavity (302) for secondary compression, thereby realizing two-stage compression. The front cover (1) is provided with a first air intake port (101) and a second air exhaust port (102), and the rear cover (5) is provided with a first air exhaust port (502) and a second air intake port (501). The disclosed vacuum pump not only has a larger internal volume ratio and improves the vacuum degree, but also reduces its power consumption and the clearance volume.

The invention belongs to the technical field of plunger pumps, and provides a split block detachable pump head with butt joint type plunger sections. A split block detachable pump head with butt joint type plunger sections comprises a pump head body and a pump body, plunger rods are arranged in the pump head body and the pump body, each plunger rod comprises a first plunger section and a second plunger section which are connected, the first plunger sections and the second plunger sections are both located in the pump body, and nesting parts are arranged at the joints of the first plunger sections and the second plunger sections. The nesting part is provided with a radial connecting hole, and a first fastener is arranged in the radial connecting hole. By adopting the arrangement, the interior and the exterior of the plunger pump can be fully disinfected and washed; the nested parts are axially staggered, so that the bearing capacity of the axial load and the radial load of the first plunger section and the second plunger section can be improved, and the overall rigidity of the plunger rod is improved; the relative positions of the second plunger section and the first plunger section are positioned through the radial connecting holes, and it can be guaranteed that the volume efficiency of the plunger pump is kept stable.

The invention discloses a low-leakage Roots rotor profile with a larger shape coefficient, which is composed of half-leaf profiles symmetrically adjacent to the pitch circle of twice the number of blades, wherein the half-leaf profile is sequentially composed of four parts, namely, a peak concentric arc outside the pitch circle, a peak conjugate profile, a valley transition curve inside the pitch circle, and a valley concentric arc, which are connected end to end, and the corresponding endpoints and connection points are sequentially a peak point, a vertex, a midpoint, a root point located on the peak symmetry axis, and a valley point located on the valley symmetry axis. The invention has a larger shape coefficient and volume utilization coefficient; has a smaller radial leakage rate and a conjugate leakage rate, and thus has a higher volumetric efficiency and a better lightweight effect.

The present invention relates to an integral high-pressure and ultra-large flow hydraulic distributing valve, comprising a valve body, wherein a stepped groove is provided in the valve body, which is located at the same hole center and has a decreasing aperture from top to bottom, the bottom of the stepped groove is connected to the liquid inlet through hole, and the suction valve seat, suction valve core, extrusion valve seat, extrusion valve core and extrusion valve stopper that contact and cooperate with each other are arranged in sequence upward along the bottom of the stepped groove, and the extrusion valve stopper is connected to the liquid discharge through hole. The present invention has a compact and reasonable structure and is easy to operate. By adopting a flat valve structure, the lower part of the suction valve core has a parabolic structure, which is conducive to reducing valve port cavitation. The suction valve and the extrusion valve are both designed with a low-friction anti-rotation structure, which solves the problem of the valve core rotating when impacted by high-speed uneven fluid; the extrusion valve seat is provided with an oblique counter-impact structure, and the impact energy of the fluid is dissipated through the oblique counter-impact structure, thereby reducing the impact of the fluid on the valve core and enhancing the operating stability of the distributing valve.

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 invention relates to an integrated equipment system for manual lifting and sewage reinjection of an oil well, and the system comprises a lifting assembly which is used for lifting crude oil to the ground; the reinjection assembly is used for injecting the sewage into the stratum; and the top of the bidirectional driving submersible motor is connected with the lifting assembly, the bottom of the bidirectional driving submersible motor is connected with the reinjection assembly, and the bidirectional driving submersible motor is used for providing power for crude oil lifting and sewage injection. Two pumps are driven to rotate in the same direction through one motor and one rotating direction, and liquid thrust in two directions is formed.

The invention provides a crankshaft and a compressor, the crankshaft comprises a long shaft part, an eccentric part and a short shaft part, and an oil absorption channel extends from the long shaft part to the short shaft part; the eccentric part is provided with an oil outlet hole communicated with the oil suction channel, the eccentric part is provided with a first expansion channel passing through the oil outlet hole, the first extension direction of the first expansion channel is parallel to a rotating shaft of the crankshaft, a second expansion channel is arranged in the circumferential direction of the eccentric part, and the second extension direction of the second expansion channel is perpendicular to the first extension direction of the first expansion channel. The oil supply structure of the eccentric part of the crankshaft can be optimized, double insurance of sealing and lubricating is achieved, the volume efficiency is improved, the friction power consumption of the crankshaft is reduced, the overall power consumption is reduced, and the energy efficiency of the compressor is improved.

The invention provides an air supplementing and enthalpy increasing assembly, a pump body assembly, a compressor and refrigeration equipment, the air supplementing and enthalpy increasing assembly comprises a base, a first sliding block, a second sliding block, a first elastic reset piece and a second elastic reset piece, a first sliding groove and a second sliding groove are formed in the base, and a first compression cavity communicating port and a first air supplementing communicating port are formed in the groove wall of the first sliding groove; a second compression cavity communication port and a second air supply communication port are formed in the wall of the second sliding groove, in the first state, the first sliding block is located at the first disconnection position, the first compression cavity communication port and the first air supply communication port are not communicated, the second sliding block is located at the second communication position, and the second compression cavity communication port and the second air supply communication port are communicated; and in the second state, the first sliding block is located at the first communicating position, the first compression cavity communicating opening communicates with the first air supply communicating opening, the second sliding block is located at the second disconnecting position, and the second compression cavity communicating opening does not communicate with the second air supply communicating opening. The air supply enthalpy increasing assembly can control the low-pressure cavity to be connected with the air supply channel, so that injection air supply to the compression cavity with small pressure is achieved, and air backflow can be effectively prevented.

The utility model provides a two-degree-of-freedom efficient piston pump, and belongs to the field of piston pumps. The piston pump solves the problem that the efficiency and the stability of a traditional piston pump can be limited when high-flow, high-pressure or special-flow-state fluid conveying is needed in some application scenes. The two-degree-of-freedom efficient piston pump comprises a cylinder body, a containing cavity is formed in the cylinder body, a piston seat used for transmitting power is arranged in the cylinder body, a first piston rod and a second piston rod which are used for transmitting power are arranged at the front end and the rear end of the piston seat respectively, and cams with a fixing function are arranged on the first piston rod and the second piston rod in a sleeving mode. The extending parts of the first piston rod and the second piston rod are respectively provided with a rolling wheel playing a rotating role, the rolling wheels are connected with the cam, and the second piston rod is provided with a coupler used for transmitting motion and torque. The utility model has the advantages that the volumetric efficiency of the pump is improved, and the mechanical efficiency of the pump is also improved.

The present application relates to the technical field of positive displacement fluid machinery, and particularly relates to a low-noise three-screw rod pump and a ship hydraulic system. The low-noise three-screw rod pump comprises a new active screw rod, a positioning sleeve, two new driven screw rods, and a smooth section. The positioning sleeve is provided on the smooth section of the new active screw rod in an interference fit. The positioning sleeve is provided with an annular limiting groove. The two new driven screw rods are symmetrically matched with the new active screw rod. The front end of the new driven screw rod is provided with a cylindrical guide section. The cylindrical guide section is rotatably embedded in the annular limiting groove. The circumferential surface of the cylindrical guide section is provided with a tapered oil guide surface. The tapered oil guide surface is clamped between the inner wall of the bushing and the annular limiting groove with a set radial gap. The low-noise three-screw rod pump and the ship hydraulic system solve the technical problems of vibration noise increase caused by the large axial installation gap and the radial thermal expansion and jamming.

A battery module (1A) is provided with a battery cell (100), a positive electrode bus bar (230) electrically connected to the battery cell (100), and a housing body (30A) housing the battery cell (100) and the positive electrode bus bar (230). At least a portion of the housing body (30A) has an exposed structure in which at least a portion of a connection portion between the battery cell (100) and the positive electrode bus bar (230) is exposed in a predetermined direction.

This utility model discloses an oil-free twin-screw air compressor, relating to the field of air compressor technology. It includes an air compressor mounting housing, with a fixed housing installed at one end of both the air inlet and outlet. A connecting block is fixedly connected to one side of the outer wall of each fixed housing, and a motor is connected to the inner wall of the connecting block. A spur gear is connected to the output end of the motor. This utility model uses an adjustment mechanism to adjust the intake and exhaust port diameters in real time, precisely matching the air demand under different operating conditions. For example, at low loads, reducing the intake area can reduce ineffective compression and leakage losses, while at high loads, rapidly expanding the opening area can ensure sufficient air supply to the components, avoiding additional energy consumption due to insufficient pressure. This reduces energy waste associated with traditional fixed throttling or variable frequency speed control methods, ensuring the compressor always operates within its high-efficiency range.

The application provides a radial plunger hydraulic device and relates to the technical field of hydraulic transmission. The radial plunger hydraulic device comprises a flow distribution part connected with an eccentric main shaft, the flow distribution part comprises a first high-pressure flow distribution window, a first low-pressure flow distribution window, a second high-pressure flow distribution window, a second low-pressure flow distribution window, a high-pressure oil hole and a low-pressure oil hole; the flow distribution part is adapted to rotate with the eccentric main shaft and is configured to be capable of controlling the first high-pressure flow distribution window and the first low-pressure flow distribution window to be connected with the first control oil path in advance / delayed or controlling the second high-pressure flow distribution window and the second low-pressure flow distribution window to be connected with the second control oil path in advance / delayed, so that the hydraulic control one-way valve is closed when the two-way plug-in valve is opened or the hydraulic control one-way valve is opened when the two-way plug-in valve is closed. Through the scheme, the volumetric efficiency of the radial plunger hydraulic device can be improved and the impact and vibration can be relieved.

The invention discloses a low-pulsation low-noise axial plunger pump device which comprises a shell, an oil distribution cover, a main shaft arranged in the middle in the shell, a plurality of plungers distributed in a back-to-back staggered mode along the circumference of the main shaft, an oil distribution disc located in the shell and arranged at the end of the main shaft, a floating cylinder base located on the rear side of the oil distribution disc, a floating cylinder and a limiting sleeve. A pressing plate is arranged between the floating cylinder and the plunger; and a driving pin is arranged between the floating cylinder seat and the main shaft. The number of the plungers is 2-3 times that of a conventional pump, the plungers are back to back and staggered, hydraulic pressure internal force borne by the main shaft can be counteracted, work and operation are stable, the generated pulsation double amplitude is very low, and compared with a traditional plunger pump, the pump is few in leakage point and high in volume efficiency; high-quality flow can be output, and noise is low. The invention has the advantages of simple structure, small occupied space, light weight, lower pressure pulsation and low noise.

The invention relates to a Roots rotor profile with higher volumetric efficiency and inner straight conjugation, comprising 4, 6, and 8 half-lobe profiles circumferentially symmetrically adjacent to each other under 2, 3, and 4 blades. The half-lobe profile is composed of six parts, namely, a peak concentric arc outside the pitch circle, a peak transition curve, a peak conjugated profile, and an inner straight conjugated profile, a valley transition curve, and a valley concentric arc inside the pitch circle, which are connected end to end. The corresponding endpoints and connection points are, in sequence, a peak point, a vertex, an outer starting point, a mid-node, an inner starting point, a root point located on a peak symmetry axis, and a valley point located on a valley symmetry axis. The low-leakage Roots rotor profile with a larger shape coefficient of the invention has a larger shape coefficient and a volume utilization coefficient, and a smaller radial leakage rate and a conjugate leakage rate, so it has a higher volumetric efficiency and a better lightweight effect.

The invention relates to the technical field of drilling equipment. The invention provides a rotor, a motor and a screw drill. The rotor comprises a rotor body, and the outer surface of the rotor body is a continuous cycloid spiral curved surface; the rotor main body is provided with a first end and a second end which are oppositely arranged, and a first section body, a middle section body and a second section body which are sequentially arranged along the axis direction of the rotor main body; the outer diameter of the first section body is gradually reduced from the first end to the second end, and the outer diameter of the second section body is gradually reduced from the second end to the first end. The problems that an existing screw drill is large in leakage loss and low in efficiency are solved.

The utility model relates to a hydraulic high-pressure gear pump with a single side plate structure, and belongs to the technical field of gear pumps. Comprising a front cover, a pump body, a rear cover, a driving shaft, a driven shaft, a driving gear, a driven gear and a single-side plate, the pump body is of a cylindrical structure with openings in the front end and the rear end, the driving shaft and the driven shaft which are vertically distributed are rotationally arranged in the pump body, the middle of the outer side of the driving shaft is fixedly sleeved with the driving gear, and the middle of the outer side of the driven shaft is fixedly sleeved with the driven gear; the driving gear and the driven gear are both located in the pump body and meshed with each other. A front cover is arranged at an opening in the front end of the pump body, a rear cover is arranged at an opening in the rear end of the pump body, a single-side plate is arranged on the inner side of the opening in the front end of the pump body and located between the front end face of the driving gear and the front end face of the driven gear and the rear end face of the front cover, and a 3-shaped sealing gasket is arranged between the single-side plate and the rear end face of the front cover; the problem that the axial size of a traditional hydraulic gear pump is large is solved.

The invention discloses an electronic water pump, a heat management system and a vehicle. The electronic water pump comprises a pump shell provided with a liquid inlet and a liquid outlet, the inner wall face of the pump shell comprises a matching circumferential face and an annular sealing face connected with one axial end of the matching circumferential face, and the matching circumferential face extends in the circumferential direction of the liquid inlet; a liquid inlet cylinder section is arranged at one axial end of the impeller assembly, and at least part of the liquid inlet cylinder section is located in an area defined by the matching circumferential face; the floating opening ring is arranged between the matching circumferential surface and the outer circumferential surface of the liquid inlet cylinder section, the floating opening ring can axially float so as to abut against the annular sealing surface for sealing when the impeller assembly rotates, the inner diameter of the matching circumferential surface is M, the outer diameter of the liquid inlet cylinder section is N, the outer diameter of the floating opening ring is P, the inner diameter of the floating opening ring is L, and M-P is larger than L-N. According to the electronic water pump, the hydraulic efficiency is obviously improved, the required motor efficiency is lower, the size and weight of the motor are reduced, light weight is achieved, the cost is reduced, and the floating opening ring is simple in structure, small in part number and easy to assemble.

The invention discloses a pump body assembly, a compressor and air conditioning equipment, and relates to the technical field of compressors, the pump body assembly comprises a first air cylinder, a second air cylinder and a partition plate, and an exhaust hole of the second air cylinder communicates with a backpressure cavity through an air guide channel; the cross section area of the air guide channel is S1, the cross section area of the exhaust hole of the second air cylinder is S2, and the ratio of S1 to S2 meets the relation that S1 / S2 is larger than or equal to 0.3 and smaller than or equal to 1.2. The length of the air guide channel is L, the diameter of the air guide channel is D, and the ratio of L to D is 1 < = L / D < = 5. According to the scheme, by limiting the ratio (S1 / S2) of the sectional area S1 of the air guide channel to the area S2 of the exhaust hole of the second air cylinder, enough air flows to the back pressure cavity, and therefore the pressure of the back pressure cavity is maintained; the ratio (L / D) of the length L to the diameter D of the communicating hole reduces the pressure loss in the gas flowing process, and the problem that the slip sheet is separated from the outer diameter of the piston roller can be solved.

The invention relates to a battery cell and a battery cell stack. A battery cell is provided with: an electrode body in which a plurality of laminated structures having a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode are further laminated; and a tape that is wound and affixed around the outer periphery of the electrode body, the tape having an overlapping portion in which one end side and the other end side in the outer peripheral direction overlap, and the tape having a plurality of stacked structures in the electrode body are stacked in a stacking direction and an end surface in the stacking direction of the electrode body is a stacking surface. The overlapping portion is disposed on a surface other than the laminated surface of the electrode body.

The bidirectional gear pump comprises a front shell, a rear shell, a first shaft hole, a second shaft hole, a third shaft hole, a fourth shaft hole, a first gear shaft and a second gear shaft, wherein the first shaft hole, the second shaft hole, the third shaft hole and the fourth shaft hole are vertically and symmetrically formed in the horizontal center line of the front shell and the rear shell; a first groove and a second groove are formed around the first shaft hole and the second shaft hole, the first gear and the second gear are installed in the grooves, and the first gear and the second gear are connected in a meshed mode; oil drainage grooves are formed in the outer end surfaces; the thicknesses of the first gear and the second gear are consistent with the depths of the first groove and the second groove of the front shell; an oil inlet and an oil outlet are formed in the outer end face of the rear shell and located in the two sides of the vertical center line of the rear shell. No gap exists between the inner end face of the front shell and the inner end face of the rear shell.

The invention discloses a dual-circuit oil circulation supply structure of a horizontal scroll compressor, which includes: a differential pressure oil supply assembly for lubricating a movable scroll bearing and a main bearing and an oil pump oil supply assembly for lubricating a bottom bearing; the differential pressure oil supply assembly includes: an oil-gas separation device and an oil return pipe, and the oil pump oil supply assembly includes: an oil pump and an oil suction pipe. The invention has the following beneficial effects: first, the differential pressure oil supply oil circuit is short, which reduces the pressure drop and leakage in the oil circuit. Second, the bottom bearing is supplied with oil by an oil pump alone instead of differential pressure oil supply, which reduces the amount of differential pressure oil supply to a certain extent, which is beneficial to improving the volumetric efficiency and the refrigeration capacity of the compressor. Third, the frequency conversion applicability is good. In the frequency conversion application, the movable scroll bearing and the main bearing are supplied with differential pressure oil, and the oil supply amount is less affected by the speed change and is not easy to wear; although the bottom bearing is supplied with oil by an oil pump, the oil supply amount is small at low speed, but the load on the bottom bearing is small, the demand for lubricating oil is small, and therefore it is not easy to wear.