CN111022426B - Flexibly-supported coaxial-drive high-speed high-pressure connecting rod plunger device - Google Patents

Abstract

The invention discloses a flexibly-supported coaxial driving high-speed high-pressure connecting rod plunger device which comprises a mechanical sealing structure, an O-shaped ring, a combined lining plate, a pressure plate, a ball bearing, a plunger, a spring washer, a shell, a rear end cover, a fastening bolt, a sealing gland, a front end cover, a swash plate, a first sliding bearing, a shaft pin, a sliding plate, a connecting rod, a central spring, a cylinder body, a valve plate, a main shaft and a second sliding bearing. The invention integrates the advantages of a swash plate type plunger pump, an inclined shaft type plunger pump and a floating cup pump, and adopts a coaxial driving structure of a through shaft type cylinder body supporting structure, a conical cylinder body, a spherical surface valve plate, a connecting rod plunger structure and a flexible support. The rotating assembly of the connecting rod plunger pump consists of a sliding disc, a connecting rod, a plunger and a conical cylinder body, the contact area of a friction pair is increased by using the flexible supporting sliding disc pair, the requirement on the allowable PV value of materials is reduced, the leakage rate of the sliding disc pair is reduced, and the survival capacity of the connecting rod plunger pump under the high-speed working condition is improved.

Description

A flexible support coaxial drive high-speed high-pressure connecting rod plunger device

technical field

The invention belongs to the technical field of hydraulic transmission and control, and in particular relates to a flexible supported coaxial drive structure and a connecting rod plunger pump or motor including the same. medium.

Background technique

The seawater hydraulic transmission technology that directly uses natural seawater as the hydraulic medium has outstanding advantages such as compatibility with specific marine environmental conditions, no environmental pollution, good safety, economical energy saving, etc. , The buoyancy adjustment of deep-dive survey ships, reverse osmosis seawater desalination systems, high-pressure water cleaning, high-rise building fire extinguishing and other fields have broad application prospects, and have become a very important development direction of international hydraulic technology.

The seawater hydraulic pump is the "heart" of the seawater hydraulic transmission system, and its research focuses on how to use seawater with physical and chemical properties such as low viscosity, poor lubricity, high electrical conductivity, high vaporization pressure and high pollution as the medium. The pump can produce the same high speed, high pressure, low vibration, low noise and high reliability as the oil hydraulic pump, so that the seawater hydraulic system can transmit large power with small volume and high efficiency like the oil hydraulic system.

The traditional mineral hydraulic oil driven pumps have gear type, vane type, plunger type and so on. Due to the particularity of the water hydraulic drive, the requirements of the water hydraulic pump are quite different. Bhusban B. of NECL in the United States found through experiments that the PV value of the same material in the axial piston pump is only 1/3 of that of the vane pump and 1/10 of that of the gear pump, and the PV value of the radial dynamic pressure bearing is about 1/4 of the gear pump, so the structure of the axial piston pump is more conducive to reducing the wear resistance requirements of the material. In the plunger pump, the weight and volume per unit power of the crankshaft-driven plunger pump and the radial plunger pump are larger, while the axial plunger pump has the characteristics of compact structure, high output pressure, high efficiency, and long service life. . Therefore, the axial piston pump is the main structural type of high-speed and high-pressure seawater pumps.

The fully seawater lubricated swash plate axial piston seawater pump is a structural form used by almost all seawater and freshwater hydraulic pumps. The structural pump has four key friction pairs (respectively, the plunger pair, the slipper pair, the distribution pair and the sliding pair). Bearings), in which the support mode of the plunger pair, the slipper pair and the distribution pair is a comprehensive way of dynamic and static pressure support, while the sliding bearing is only a dynamic pressure support. The sliding shoe pair is composed of a sliding shoe and a swash plate. The sliding shoe is supported by the swash plate to push the plunger to move axially, and at the same time, it slides at high speed on the swash plate. The supporting force, the pressure of the return disc, its own inertial force, the flow resistance, the lift force and the viscous friction force. It will cause it to overturn, resulting in eccentric wear of the slipper, and the stability of the water film will be destroyed, resulting in the phenomenon of wear and burn. The force and the centrifugal force of the plunger make a wedge-shaped gap between the cylinder block and the valve plate, which increases the volume loss of the pump and causes the surface burn between the cylinder block and the valve plate; The plunger performs high-speed reciprocating and self-rotating motion in the plunger cavity of the cylinder body. The force between the two is complex and the matching clearance is high. The plunger often has scratches, bulges, and breaks, and the cylinder has scratches, cracks, and pull-outs. etc. phenomenon. When the axial piston pump is in high speed and high pressure condition, the possibility of failure of the three key friction pairs of the slipper pair, the plunger pair and the distribution pair increases, which seriously affects the working performance of the hydraulic pump. Therefore, it is necessary to design a new key friction pair structure according to the high-speed, high-pressure and high-pollution conditions, which can eliminate or reduce the overturning of the slipper, reduce the lateral force of the plunger on the cylinder, and reduce the gap between the cylinder and the valve plate. The wedge-shaped gap can improve the working performance of the seawater plunger pump under high-speed and high-pressure conditions and prolong its working life.

SUMMARY OF THE INVENTION

The main technical problem to be solved by the present invention is to provide a flexible supported coaxially driven connecting rod plunger pump or motor which can adapt to high-speed, high-pressure and high-pollution working conditions. The coaxial drive structure of the flexible support can reduce the wedge-shaped gap during the operation of the sliding plate, and keep the connecting rod and the axis of the cylinder hole always in the same plane, which improves the volumetric efficiency of the plunger pump or motor, and improves the driving force by the connecting rod. The wear of the connecting rod caused by the movement of the sliding plate improves the reliability of the connecting rod and the plunger. Instead of the traditional sliding shoe pair structure, the integrated sliding plate pair structure is adopted. At the same time, the cylinder body is a conical cylinder body, and the radius of the ball and socket distribution circle of the sliding plate is larger than the radius of the conical bottom surface formed by the axis of the cylinder hole, and the conical bottom surface is too high. The center of the ball socket at the point is perpendicular to the axis of the main shaft, which reduces the lateral force on the plunger and improves the lubrication state of the plunger.

Under high-speed and high-pressure conditions, the flexible support sliding plate pair structure not only increases the contact area of the friction pair, effectively reduces the PV value of the friction pair, but also reduces the leakage of the sliding plate pair, even under high-speed and high-pressure conditions. It still has good stability and volumetric efficiency; the coaxial drive mode replaces the drive mode of the connecting rod driving the rotation of the sliding plate, which can make the main shaft, the cylinder block and the sliding plate rotate coaxially, avoiding the connecting rod and the connecting rod caused by the connecting rod driving. The wear of the connecting rod caused by the direct contact of the cylinder hole is especially serious under high speed and high pressure; the double-ended connecting rod plunger structure maintains a good sealing performance while reducing the lateral force on the plunger and alleviating the When the plunger is in an inclined state, the risk of being pulled and worn by the cylinder hole increases the return force on the plunger, improves the plunger return, and reduces the possibility of the plunger pump being sucked at high speed. The friction pair in this patent adopts the "hard-hard" pairing form, which is not easy to wear the friction pair under high pollution, and still has good sealing and stability, which greatly improves the survival of the friction pair under extreme working conditions. ability to extend the working life of the plunger pump.

The present invention adopts following technical scheme:

A flexible supported coaxial drive high-speed high-pressure connecting rod plunger sea water pump or motor, the flexible supported coaxial drive structure is used for the plunger pump or motor, the flexible supported coaxial drive structure comprises a flexible support combined lining plate (3), pressure plate (4), ball joint (5), swash plate (13), first sliding bearing (14), shaft pin (15), sliding plate (16), key (18), cone A cylinder block (20), a main shaft (21) and a second sliding bearing (23). The main shaft (22) is machined with a keyway at the matching position with the tapered cylinder (20), and a pin hole is formed at the position corresponding to the sliding plate (16), and the main shaft (22) passes through the key (18) , Drive the cylinder (20) and the sliding plate (16) to rotate at the same time with the shaft pin (15), the shaft pin (15) drives the sliding plate (16) to slide on the swash plate and also slides in the pin groove.

The combined lining plate (3) has a rubber combined structure in the middle of the stainless steel material on both sides, and the three are assembled together by a vulcanization process. When the plunger pump is working, the sliding plate (16) is subjected to the force of the water film on one side of the high pressure area, the rubber in the middle of the combined lining plate (3) is compressed, and the rubber on the other side is stretched, and the combination The type liner (3) can be lifted in the low pressure area. During the working process of the plunger pump, the combined lining plate (3) can closely fit the sliding plate (16) to reduce the thickness of the auxiliary water film of the sliding plate, which is beneficial to increase the volumetric efficiency of the plunger pump.

The shaft pin (15) can also be a drum-shaped tooth, the drum-shaped tooth and the sliding plate (16) constitute a gear transmission mechanism, and the main shaft (22) drives the cylinder (20) simultaneously with the drum-shaped tooth through the key (18). ) and the sliding plate (16) rotate, the drum tooth (15) drives the sliding plate (16) to slide on the swash plate, and also slides in the inner teeth processed by the sliding plate (16).

The main shaft (20) is provided with a keyway at a position corresponding to the cylinder block (20), and the main shaft (20) is provided with a pin hole or a drum-shaped tooth at a position corresponding to the sliding plate (16). , the main shaft (20) is provided with a ceramic or cemented carbide coating at the swash plate (13) and the rear end cover (9), and the two places can form the first part with the swash plate (13) and the rear end cover (9). A sliding bearing (14) and a second sliding bearing (23).

The radius of the ball socket distribution circle of the sliding plate (16) is larger than the radius of the bottom surface of the cone formed by the axis of the cylinder hole, and the bottom surface of the cone passes the center of the ball socket at the top dead center and is perpendicular to the axis of the main shaft (22). The rear end cover (9) is provided with a flow channel (h) for the lubrication of the sliding bearing at the second sliding bearing (23).

The sliding plate (16) and the pressure plate (4) are connected by bolts, a plurality of ball sockets are arranged on one side of the sliding plate (16), and the ball socket side is arranged on the pressure plate (4) and the sliding plate (16). The contact surfaces are provided with ball sockets of equal size and number, and the ball sockets formed by the pressure plate (4) and the sliding plate (16) can constrain the ball head of the connecting rod and drive the connecting rod (17) to move.

The inner circle of the sliding plate (16) is provided with symmetrical pin grooves or drum-shaped teeth, and the inner circle of the pressure plate (4) is machined with a spherical surface of the same radius as the ball hinge (5). ) clearance fit or fit between the drum teeth, the sliding plate (16) closely fits the combined lining plate (3) and the swash plate (13) under the action of the ball hinge (5), and is connected to the shaft pin (15) Or driven by the drum teeth, it slides on the combined lining plate (3) and the swash plate (13).

The cylinder block (20) is assembled with the main shaft (22) through interference fit through two keys, and when the main shaft (22) rotates, the main shaft (22) drives the cylinder block (20) through the key (18). ) rotates on the valve plate (21), and the axis of the cylinder bore and the axis of the main shaft form a certain angle.

The plunger pump or motor is a flexible supported coaxially driven high-speed high-pressure connecting rod plunger sea water pump or motor, which includes a mechanical seal structure (1), an O-ring (2), a combined liner (3), a pressure Disc (4), ball hinge (5), plunger (6), spring washer (7), housing (8), rear end cover (9), fastening bolt (10), sealing gland (11), Front end cover (12), swash plate (13), first sliding bearing (14), shaft pin (15), sliding plate (16), connecting rod (17), central spring (19), cylinder block (20), A valve plate (21), a main shaft (22), and a second sliding bearing (23). The main shaft (22) coincides with the axis of the cylinder body (20), and penetrates through the front end cover (12), the swash plate (13), the combined lining plate (3), the sliding plate (16), the ball hinge (5), and the cylinder body (20) and the valve plate (21), and are supported by the first sliding bearing (14) in the swash plate (13) and the second sliding bearing (23) at the rear end cover (9). The cylinder (20) passes through The sliding plate (16) has symmetrical pin grooves or inner drum teeth in the inner circle, and is connected by the shaft on the main shaft (22). The pin (15) or the drum-shaped teeth processed on the shaft are driven and slide on the combined lining plate (3) under the action of the spherical hinge (5) and the central spring (19). The bearing (14) can be lubricated by the working medium through the pin groove or the drum tooth groove.

When the mechanism is a plunger pump, when the motor drives the main shaft (22) to rotate, the cylinder body (22) is driven by the key (18) and the shaft pin (15) or the drum teeth machined on the main shaft. 20) Coaxially rotates around the axis with the sliding plate (16), and under the action of the pressure of the central spring (19) and the reverse thrust of the water film of the distribution plate (21), the sliding plate (16) and The combined lining plate (3) or the swash plate (13) closely fits and slides, and the plunger (6) reciprocates in the conical cylinder hole to realize the suction and drainage work of the connecting rod plunger pump. (20) Rotating with the sliding plate (16) at the same angular velocity, the connecting rod (14) is not in contact with the cylinder block (20), and friction and wear do not occur.

When the mechanism is a motor, under the action of high-pressure water, the pressure of the plunger cavity acts on the swash plate (13) through the plunger (6), and the swash plate (13) reacts to the plunger (6) The radial component of the force causes the cylinder (20) to generate torque, and the key (18) transmits the torque to the main shaft (22), and the main shaft (22) drives the load to do work.

beneficial effect

1. The coaxial drive structure of flexible support adopted in the present invention, when the pump or motor moves at high speed, the cylinder body and the sliding plate perform coaxial rotation movement, the axis of the connecting rod is always in the same plane as the axis of the plunger, and the connecting rod and the cylinder are in the same plane. There is no phase difference in the rotation of the body, and the connecting rod is not in direct contact with the cylinder block, which avoids friction between the connecting rod and the cylinder block due to high-speed and heavy-load conditions, reduces the reliability of parts, and reduces the vibration of the plunger pump. Noise, which is beneficial for pumps or motors working at high speeds.

2. The present invention adopts the swash plate type plunger connecting rod structure and the conical cylinder structure, the radius of the distribution circle of the sliding plate ball socket is larger than the radius of the conical bottom surface formed by the axis of the cylinder hole, and the conical bottom surface passes the center of the ball socket at the top dead center. and perpendicular to the spindle axis. When the pump or motor is moving at high speed, the centrifugal force on the rotating components cannot be ignored. When the radius of the ball-socket distribution circle of the sliding plate is larger than the radius of the conical bottom surface formed by the axis of the cylinder hole, the connecting rod-plunger structure can not only reduce the pressure on the cylinder body Lateral force can provide the return force of the plunger at the same time to avoid the phenomenon of cavitation, and the small lateral force makes it possible to apply the "hard-hard" pairing in the material selection of the plunger pair.

Description of drawings

1 is a schematic structural diagram of an embodiment of a flexible supported coaxially driven high-speed high-pressure connecting rod plunger sea water pump or motor in the present invention;

2 is a schematic structural diagram of an embodiment of a flexible supported coaxially driven high-speed high-pressure connecting rod plunger sea water pump or motor when the coaxial driving structure is a drum-shaped tooth drive;

Figure 3 is a front view and a sectional view of the combined lining plate;

4 is a sectional view of the main shaft when the coaxial drive structure is driven by a shaft pin;

Figure 5 is a cross-sectional view of the cylinder;

6 is a schematic structural diagram of a sliding plate;

Figure 7 is a cross-sectional view of the rear end cover.

In the figure: 1. Mechanical seal structure, 2. O-ring, 3. Combined lining plate 4. Pressure plate, 5. Ball hinge, 6. Plunger, 7. Center spring washer, 8. Housing, 9. Rear End cover, 10, Fastening bolt, 11, Mechanical seal gland, 12, Front end cover, 13, Swash plate, 14, First sliding bearing, 15, Shaft pin or drum tooth, 16, Slide plate, 17, Double Head connecting rod, 18, key, 19, central spring, 20, conical cylinder, 21, valve plate, 22, main shaft, 23, second sliding bearing,

a. The rubber part in the combined lining plate, b. The first keyway, c. The ceramic sprayed surface corresponding to the first sliding bearing on the main shaft, d. The pin hole or drum tooth, e. The second keyway, f. On the main shaft Corresponding to the ceramic sprayed surface of the second sliding bearing, g, the sliding plate auxiliary supports the discharge outlet, h, the sliding plate auxiliary supports the surface texture structure, and i, the second sliding bearing lubricating flow channel.

Detailed ways

Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail:

In the present invention, the sliding disk can be driven in two ways: pin driving and drum tooth driving. For the convenience of description, the embodiment of the present invention is shown in a relatively simple pin driving mode.

Fig. 1 is an embodiment of a flexible supported coaxially driven high-speed high-pressure connecting rod plunger sea water pump or motor in the present invention. The coaxially driven connecting rod plunger pump includes a mechanical seal structure (1), a combination of lining plate (3), pressure plate (4), ball hinge (5), plunger (6), housing (8), rear end cover (9), front end cover (12), swash plate (13), First sliding bearing (14), sliding plate (16), connecting rod (17), central spring (19), cylinder block (20), valve plate (21), main shaft (22), second sliding bearing (23) . The main shaft (22) coincides with the axis of the cylinder body (20), and penetrates through the front end cover (12), the swash plate (13), the combined lining plate (3), the sliding plate (16), the ball hinge (5), and the cylinder body (20) and the valve plate (21), and are supported by the first sliding bearing (14) in the swash plate (13) and the second sliding bearing (23) at the rear end cover (9). The cylinder (20) passes through The key (18) can be a flat key, and the sliding plate (16) has symmetrical pin grooves in the inner circle, and is connected by the main shaft (22). The shaft pin (15) on the ) drives and slides on the combined lining plate (3) under the action of the ball hinge (5) and the central spring (19). The first sliding bearing (14) The working medium is lubricated through the pin groove or the drum-shaped tooth groove. When the main shaft (22) rotates, the cylinder block (20) and the shaft are driven by the key (18) and the shaft pin (15) when the main shaft (22) rotates. The sliding plate (16) rotates coaxially around the axis, and under the action of the pressure of the central spring (19) and the centrifugal force of the connecting rod plunger, the sliding plate (16) and the combined lining plate (3) ) or the swash plate (13) closely fit and slide, the plunger (6) reciprocates in the conical cylinder hole to realize the suction and drainage work of the connecting rod plunger pump motor, the cylinder block (20) and the sliding plate (16) Rotating motion at the same angular velocity is performed, the connecting rod (14) is not in contact with the cylinder block (20), and friction and wear are not generated.

Fig. 2 is an embodiment of a coaxially driven high-speed high-pressure connecting rod plunger sea water pump or motor that is flexibly supported when the coaxial driving structure is a drum gear drive in the present invention. The inner circle of the sliding plate (16) is machined with drum-shaped teeth for matching with the drum-shaped teeth on the main shaft (22). During the operation of the plunger pump or motor, the drum-shaped teeth on the main shaft (22) drive the sliding plate (16) to rotate, and the sliding plate (16) rotates coaxially with the cylinder body (20).

3 is a front view and a cross-sectional view of a combined lining plate. The combined lining plate (3) is a combined structure with a stainless steel material on both sides and rubber (a) in the middle, and the three are assembled together by a vulcanization process. When the plunger pump is working, the sliding plate (16) is subjected to the force of the water film on one side of the high pressure area, the rubber in the middle of the combined lining plate (3) is compressed, and the rubber on the other side is stretched, and the combination The type liner (3) can be lifted in the low pressure area. During the working process of the plunger pump, the combined lining plate (3) can closely fit the sliding plate (16) to reduce the thickness of the auxiliary water film of the sliding plate, which is beneficial to increase the volumetric efficiency of the plunger pump.

Fig. 4 is a sectional view of the main shaft, the front end of the main shaft (22) is provided with a keyway for realizing the transmission of motor torque, and a position corresponding to the cylinder block (20) and the swash plate (13) is provided with The symmetrical keyway (d) and pin hole (c) can realize the torque transmission to the cylinder block (20) and the sliding plate (16). The first sliding bearing friction surface (b) and the second sliding bearing friction surface (e) are arranged at the positions, both of which can be sprayed with ceramic or cemented carbide, and the main shaft (22) is located in the cylinder block (20) A keyway (d) is machined at the corresponding position, and the main shaft (22) and the cylinder block (20) are in an interference fit.

Fig. 5 is a sectional view of the cylinder block, the cylinder block (20) is machined with a stepped through hole at the axis, the small stepped hole is machined with a symmetrical keyway (d), and the large stepped hole is a smooth cylindrical shape for installing the Center spring (19). The cylinder block (20) is circumferentially machined with the cylinder holes (g) corresponding to the number of plungers, the axis of the cylinder hole (g) forms a certain angle to the axis of the cylinder block (20), and the flow distribution surface of the cylinder block (20) is a spherical surface.

Fig. 6 is a schematic diagram of the structure of the sliding plate, the connecting rod (17) side of the sliding plate (16) is machined with ball sockets (h) corresponding to the number of plungers, and the opposite side of the ball socket (h) is machined with a supporting sliding plate ( 16) The water chamber (i). The sliding plate (16) cooperates with the pressing plate (4) to complete the driving and return of the connecting rod (17). The inner hole of the sliding plate (16) is machined with a symmetrical pin groove (1), which cooperates with the shaft pin (15) to complete the torque transmission from the shaft (22) to the sliding plate (16). The sliding plate (16) can closely fit with the combined lining plate (3) or the swash plate (13) under the action of the central spring (19). The auxiliary bearing surface of the sliding plate (16) is machined with a discharge opening (f) and a textured structure (g), which can provide a dynamic pressure supporting force for the sliding plate.

Fig. 7 is a sectional view of the rear end cover. A blind hole is machined at the axis of the rear end cover (9), which can form the second sliding bearing (23) with the main shaft (22). (23) A flow channel (h) for sliding bearing lubrication is machined in the front and rear. The flow channel (h) communicates with the inside of the casing. The rear end cover is machined with a drainage port (m) and water absorption at the position of the waist-shaped groove of the valve plate. mouth (n).

Claims (7)

1. The utility model provides a high-speed high-pressure connecting rod plunger device of coaxial drive of flexible support which characterized in that: the flexible supporting coaxial driving structure comprises a flexible supporting combined lining plate (3), a pressure plate (4), a spherical hinge (5), a swash plate (13), a first sliding bearing (14), a shaft pin (15), a sliding plate (16), a key (18), a conical cylinder body (20), a main shaft (22) and a second sliding bearing (23), a key groove for the key (18) is arranged at the part of the main shaft (22) matched with the cylinder body (20), the part of the main shaft (22) corresponding to the sliding disc (16) is provided with a pin hole for the shaft pin (15), the main shaft (22) and the shaft pin (15) drive the cylinder body (20) and the sliding disc (16) to rotate simultaneously through the key (18), the shaft pin (15) drives the sliding disc (16) to slide on the swash plate and simultaneously slides in a pin groove of the sliding disc (16);

the shaft pin (15) is a drum-shaped tooth, the drum-shaped tooth and the sliding disc (16) form a gear transmission mechanism, a main shaft (22) and the drum-shaped tooth drive the cylinder body (20) and the sliding disc (16) to rotate simultaneously through a key (18), and the drum-shaped tooth drives the sliding disc (16) to slide on the swash plate and simultaneously slide in the inner teeth of the sliding disc (16); the two sides of the combined lining plate (3) are made of stainless steel materials, the middle of the combined lining plate is made of rubber, the stainless steel materials, the rubber and the rubber are assembled together through a vulcanization process, when the plunger pump works, the slide disc (16) is under the acting force of a water film on one side of a high-pressure area, the rubber in the middle of the combined lining plate (3) is under the compression action, the rubber in the middle of the combined lining plate (3) is under the tension action on one side of a low-pressure area, and the combined lining plate (3) is tilted in the low-pressure area;

The main shaft (22) is provided with ceramic or hard alloy coatings at the positions of the swash plate (13) and the rear end cover (9), and the two positions, the swash plate (13) and the rear end cover (9) form a first sliding bearing (14) and a second sliding bearing (23);

the radius of a ball socket distribution circle of the sliding disc (16) is larger than the radius of a conical bottom surface formed by the axes of the cylinder holes, the conical bottom surface passes through the center of the ball socket at the top dead center and is vertical to the axis of the main shaft (22), and the rear end cover (9) is provided with a flow passage (h) for lubricating the sliding bearing at the second sliding bearing (23).

2. A flexibly supported coaxially actuated high speed high pressure connecting rod plunger assembly as claimed in claim 1, wherein: the sliding plate (16) is connected with the pressure plate (4) through a bolt, a plurality of ball sockets are arranged on one side of the sliding plate (16), the ball sockets with the same size and number are arranged on the surface, in contact with the side, provided with the ball sockets, of the sliding plate (16) on the pressure plate (4), and the ball sockets formed by the pressure plate (4) and the sliding plate (16) can restrict the ball head of the connecting rod and drive the connecting rod (17) to move.

3. A flexibly supported coaxially driven high speed, high pressure connecting rod plunger assembly as defined in claim 1 wherein: symmetrical pin grooves or drum-shaped teeth are formed in the inner circle of the sliding disc (16), spherical surfaces with the same radius as the spherical hinge (5) are processed in the inner circle of the pressure plate (4), the pin grooves are in clearance fit with the shaft pins (15) or are matched with the drum-shaped teeth, the sliding disc (16) is tightly attached to the combined lining plate (3) and the swash plate (13) under the action of the spherical hinge (5), and slides on the combined lining plate (3) and the swash plate (13) under the driving of the shaft pins (15) or the drum-shaped teeth.

4. A flexibly supported coaxially actuated high speed high pressure connecting rod plunger assembly as claimed in claim 1, wherein: the cylinder body (20) is assembled with the main shaft (22) through two keys in an interference fit mode, when the main shaft (22) rotates, the main shaft (22) drives the cylinder body (20) to rotate on the valve plate (21) through the keys (18), and the axis of a cylinder hole and the axis of the main shaft form a certain included angle.

5. A flexibly supported coaxially actuated high speed and high pressure connecting rod plunger assembly as claimed in any one of claims 1 to 4 wherein: a plunger pump or motor designed by utilizing a coaxially-driven high-speed high-pressure connecting rod plunger device with flexible support comprises a mechanical sealing structure (1), an O-shaped ring (2), a combined lining plate (3), a pressure plate (4), a spherical hinge (5), a plunger (6), a spring washer (7), a shell (8), a rear end cover (9), a fastening bolt (10), a sealing gland (11), a front end cover (12), a swash plate (13), a first sliding bearing (14), a shaft pin (15), a sliding disc (16), a connecting rod (17), a central spring (19), a cylinder body (20), a valve plate (21), a main shaft (22) and a second sliding bearing (23), wherein the main shaft (22) is superposed with the axis of the cylinder body (20) and penetrates through the front end cover (12), the swash plate (13), the combined lining plate (3), the sliding disc (16), the spherical hinge (5), the cylinder body (20) and the valve plate (21), the bearing is supported by a first sliding bearing (14) in a swash plate (13) and a second sliding bearing (23) at a rear end cover (9), a cylinder body (20) is matched on a main shaft (22) in an interference mode and transmits torque through a key (18), symmetrical pin grooves or inner drum-shaped teeth are formed in the inner circle of a sliding plate (16), the pin grooves or the inner drum-shaped teeth are driven by a shaft pin (15) on the main shaft (22) or drum-shaped teeth machined on the shaft and slide on a combined lining plate (3) under the action of a spherical hinge (5) and a central spring (19), and the first sliding bearing (14) is lubricated by a working medium through the pin grooves or the drum-shaped tooth grooves.

6. A flexibly supported coaxially actuated high speed high pressure connecting rod plunger assembly as claimed in claim 5, wherein: when the plunger pump is used, a motor drives the main shaft (22) to rotate, the cylinder body (20) and the sliding disc (16) synchronously rotate around the axis under the driving of the key (18), the shaft pin (15) or the drum-shaped teeth on the main shaft, the sliding disc (16) is tightly attached to the combined lining plate (3) or the swash plate (13) and slides under the action of the pressure of the central spring (19) and the water film reverse thrust of the flow distribution disc (21), the plunger (6) reciprocates in the conical cylinder hole to realize the water suction and drainage work of the connecting rod plunger pump, the cylinder body (20) and the sliding disc (16) rotate at the same angular velocity, and the connecting rod is not contacted with the cylinder body (20).

7. A flexibly supported coaxially actuated high speed high pressure connecting rod plunger assembly as claimed in claim 5, wherein: when the hydraulic motor is a motor, under the action of high-pressure water, the pressure of a plunger cavity acts on the swash plate (13) through the plunger (6), the radial component of the reaction force of the swash plate (13) to the plunger (6) enables the cylinder body (20) to generate torque, the torque is transmitted to the main shaft (22) through the key (18), and the load is driven to do work through the main shaft (22).

Images