阅读说明：本技术 柱塞泵变量机构 (Plunger pump variable mechanism ) 是由 李童 叶鹏飞 李玮斌 于 2021-08-20 设计创作，主要内容包括：本发明提供了一种柱塞泵变量机构,属于液压泵技术领域。它解决了连接件更换不便的问题。本柱塞泵变量机构包括壳体、斜盘、控制阀以及活塞,壳体内设有供活塞穿设的活塞孔以及与活塞孔相交呈十字状的连通孔,斜盘与控制阀布置于连通孔的两侧,活塞上连接有连接件,当活塞移动时通过连接件能带动斜盘与控制阀联动,活塞上沿径向贯穿设置有装配孔,连接件自通孔的一端孔口装入壳体内并穿过装配孔,活塞一端设有与装配孔垂直连通的安装孔,安装孔内可拆卸连接有顶紧件,顶紧件端部顶紧在连接件上。本柱塞泵变量机构具备方便更换连接件、连接件固定更加牢固等优点。(The invention provides a variable mechanism of a plunger pump, and belongs to the technical field of hydraulic pumps. It has solved the inconvenient problem of connecting piece change. This plunger pump variable mechanism includes the casing, the sloping cam plate, control valve and piston, be equipped with the piston hole that supplies the piston to wear to establish in the casing and intersect the intercommunicating pore that is the cross form with the piston hole, the sloping cam plate arranges the both sides at the intercommunicating pore with the control valve, be connected with the connecting piece on the piston, can drive sloping cam plate and control valve linkage through the connecting piece when the piston removes, radially run through on the piston and be provided with the pilot hole, the connecting piece is packed into in the casing and is passed the pilot hole from the one end drill way of through-hole, piston one end is equipped with the mounting hole that communicates with the pilot hole is perpendicular, can dismantle in the mounting hole and be connected with a tight piece in top, tight piece tip top is tight on the connecting piece in top. The plunger pump variable mechanism has the advantages of convenience in replacing connecting pieces, firmness in fixing of the connecting pieces and the like.)

1. A variable mechanism of a plunger pump comprises a shell (1), a swash plate (7), a control valve (9) and pistons (2), wherein piston holes (1a) for the pistons (2) to penetrate through and communicating holes (1b) intersected with the piston holes (1a) and in a cross shape are formed in the shell (1), the swash plate (7) and the control valve (9) are arranged on two sides of the communicating holes (1b), a connecting piece (3) is connected onto the pistons (2), the swash plate (7) can be driven to be linked with the control valve (9) through the connecting piece (3) when the pistons (2) move, the variable mechanism is characterized in that assembling holes (2c) penetrate through the pistons (2) along the radial direction, the connecting piece (3) is arranged in the shell (1) from an orifice at one end of the through hole (1b) and penetrates through the assembling holes (2c), a mounting hole (2d) vertically communicated with the assembling holes (2c) is formed in one end of the pistons (2), the inside of the mounting hole (2d) is detachably connected with a top fastening piece (4), and the end part of the top fastening piece (4) is tightly pressed on the connecting piece (3).

2. Plunger pump variable mechanism according to claim 1, characterized in that the piston (2) comprises a first part (2a) and a second part (2b) having a larger outer diameter than the first part (2a), that the fitting hole (2c) is provided in the second part (2b) near the first part (2a), and that the mounting hole (2d) is provided in the second part (2 b).

3. The plunger pump variable displacement mechanism according to claim 2, characterized in that the connecting piece (3) is in a round rod shape, two ends of the connecting piece (3) extend out of two end openings of the assembling hole (2c), a first linkage structure (5) is arranged between one end of the connecting piece (3) and the swash plate (7), and a second linkage structure (6) is arranged between the other end of the connecting piece (3) and the control valve (9).

4. The plunger pump variable mechanism according to claim 3, characterized in that the mounting hole (2d) is a threaded hole, and the tightening piece (4) is a screw which is screwed into the mounting hole (2 d).

5. Plunger pump variable mechanism according to claim 4, characterized in that the connecting piece (3) is provided with a matching groove (3a) at the side part, and the top part (4) is provided with a top tightening part (4a) matched with the matching groove (3a) in shape at the end part.

6. The plunger pump variable mechanism according to claim 5, characterized in that the inner wall of the fitting groove (3a) is a tapered surface.

7. Plunger pump variable mechanism according to claim 5, characterized in that the inner wall of the mating groove (3a) is spherical.

8. A variable displacement mechanism for a plunger pump according to claim 3, 4 or 5, characterized in that the first linkage structure (5) comprises a connecting groove (7a) formed on the swash plate (7) and a spherical connecting portion (3b) formed at the end corresponding to the connecting member (3), and the connecting portion (3b) is located in the connecting groove (7 a).

9. The plunger pump variable mechanism according to claim 3, 4 or 5, characterized in that the control valve (9) comprises a control rod (9a) which is parallel to the piston (2) and can move, the linkage structure II (6) comprises a linkage rod (8), one end of the linkage rod (8) is hinged with the control rod (9a), the other end of the linkage rod (8) is provided with a spherical linkage part (8a), a corresponding end part of the connecting piece (3) is provided with a linkage groove (3c), and the linkage part (8a) is positioned in the linkage groove (3 c).

Technical Field

The invention belongs to the technical field of hydraulic pumps, relates to a variable mechanism, and particularly relates to a variable mechanism of a plunger pump.

Background

The swash plate type hydraulic plunger pump is a hydraulic pump which realizes oil absorption and oil pressing by means of reciprocating motion of a plunger in a cylinder body, wherein a variable mechanism is an indispensable important working component in the swash plate type plunger pump, and an included angle between a swash plate and a driving shaft of the hydraulic pump is changed by utilizing the variable mechanism, so that the oil absorption and discharge stroke and volume of the plunger are indirectly changed, and the displacement of the hydraulic pump is changed.

The inventor has invented a variable mechanism of a plunger pump with reduced abrasion and a control method thereof, which has a shell, a servo piston, a rear cover, a shifting block and a swash plate, and has application number CN 201310687469.2; the shell is fixedly connected with the rear cover, and the servo piston is horizontally arranged between the shell and the rear cover; a working oil cavity is formed between the small end of the servo piston and the shell, and a working oil cavity is formed between the large end of the servo piston and the rear cover; the shifting block is in threaded connection with the servo piston; the shifting block is hinged with the swash plate through a ball head and a ball socket; the ball head is connected with the shifting block through a sliding rod; the ball socket is a closed ball socket, and the ball socket is connected with the ball head through a ball hinge; the ball head is provided with a spiral oil groove, and high-pressure oil is introduced through the swash plate and the ball socket to form a high-pressure oil film.

However, the variable mechanism of the plunger pump capable of reducing the abrasion and the control method thereof still have some defects, the variable mechanism of the plunger pump capable of reducing the abrasion pushes the swash plate to deflect through the shifting block which is connected to the servo piston through threads, because the servo piston is arranged in the shell, when the shifting block needs to be replaced after being abraded, if a worker does not fix the shifting block firstly, when the servo piston is rotated and disassembled, the servo piston can drive the shifting block to rotate together, so that the shifting block can not be disassembled, the worker must fix the shifting block with one hand firstly and then rotationally disassemble the whole piston with the other hand, the replacement of the shifting block can be realized, and because the whole piston has large mass, time and labor are wasted in the process of fixing the shifting block with one hand and disassembling the servo piston with the other hand, and great inconvenience is brought to the worker.

Disclosure of Invention

The invention aims to provide a variable mechanism of a plunger pump aiming at the problems in the prior art, and solves the problem that a connecting piece is inconvenient to replace.

The purpose of the invention can be realized by the following technical scheme:

plunger pump variable mechanism, including casing, sloping cam plate, control valve and piston, the casing in be equipped with the piston hole that supplies the piston to wear to establish and intersect the intercommunicating pore that is the cross with the piston hole, the sloping cam plate is arranged in the both sides of intercommunicating pore with the control valve, is connected with the connecting piece on the piston, can drive sloping cam plate and control valve linkage through the connecting piece when the piston removes, its characterized in that, the piston on along radially running through and being provided with the pilot hole, the connecting piece is packed into the casing and is passed the pilot hole from the one end drill way of through-hole, piston one end is equipped with the mounting hole that communicates perpendicularly with the pilot hole, can dismantle in the mounting hole and be connected with a piece that pushes up, pushes up tight tip top tightly on the connecting piece.

The axis mutually perpendicular of piston hole and intercommunicating pore in the casing, and the perisporium of piston hole run through the intercommunicating pore for piston hole and intercommunicating pore are the cross, and during the installation, the piston wears to locate in the piston hole in the casing, makes the piston partly be located the intercommunicating pore downthehole, and radially runs through the pilot hole that sets up on the piston this moment and also be located the intercommunicating pore downthehole, places the connecting piece in the intercommunicating pore again simultaneously. Because piston one end is equipped with the mounting hole with the perpendicular intercommunication of pilot hole, the event is installed in the mounting hole through a holding member and is made a holding member one end top tightly on the connecting piece, realize the connecting piece promptly and dismantle fixedly on the piston, the connecting piece is by the spacing fixed back of holding member, set up swash plate and control valve in the connecting piece both ends (arrange in the both sides of intercommunicating pore promptly), can drive swash plate and control valve linkage through the connecting piece during piston reciprocating motion, thereby realize the swash plate swing in order to realize changing the variable of plunger pump and the motion of control valve. When dismantling the piston, need not the one hand and fix the connecting piece, and the piston is dismantled to the other hand, only needs to pull down through the tight piece in top that will push up the connecting piece for the connecting piece loses the effort of the tight piece in top, just can tear the connecting piece out the piston, thereby realizes the purpose of changing the connecting piece. In general conditions, threaded connection is adopted, so that the connection can be replaced more conveniently, in the technical field, during assembly, due to the limitation of a pump body of a hydraulic pump, the shifting block and the piston are connected by threads, so that time and labor are wasted during disassembly and assembly, and after the piston is assembled with the shifting block, when the piston moves, the coaxial errors of the diameters of the two ends of the piston are increased due to the objective existence of form and position errors, so that the piston generates a clamping stagnation phenomenon during movement in a piston hole.

In the above plunger pump variable displacement mechanism, the piston includes a first portion and a second portion having an outer diameter larger than that of the first portion, the fitting hole is provided on the second portion near the first portion, and the mounting hole is provided on the second portion.

The fact that the second part of the piston has a larger outer diameter than the first part and the mounting hole is provided in the second part means that the corresponding hole in the housing in the second part of the piston must also be larger and from which the operator can operate the tightening member more easily. Meanwhile, the assembly hole is also formed in the second portion, and the contact area of the connecting piece and the piston is larger than the contact area of the connecting piece mounted on the first portion, so that stability can be well maintained.

In the plunger pump variable mechanism, the connecting piece is in a round rod shape, two ends of the connecting piece extend out of orifices at two ends of the assembling hole, a first linkage structure is arranged between one end of the connecting piece and the swash plate, and a second linkage structure is arranged between the other end of the connecting piece and the control valve.

Because the connecting piece is round bar shape, and the pilot hole is the hole with connecting piece looks adaptation, when the connecting piece setting with the pilot hole in, the connecting piece both ends all stretch out outside the both ends drill way of pilot hole, during the dismantlement, pull down the tight piece in top earlier, arbitrary one end that the rethread held the connecting piece and stretched out the drill way both can directly extract the connecting piece to realize convenient and fast's dismantlement more. One end of the connecting piece is connected with the swash plate through the first linkage structure, the other end of the connecting piece is connected with the control valve through the second linkage structure, and when the piston drives the connecting piece to move, the connecting piece can be linked with the second linkage structure through the first linkage structure, so that the angle between the swash plate and the piston is changed, and the control valve is driven to move.

In the variable mechanism of the plunger pump, the mounting hole is a threaded hole, and the jacking piece is a screw which is in threaded connection with the mounting hole.

Because the screw is dismantled very conveniently, so adopt the screw to cooperate with the screw hole and push up the connecting piece tightly for need not to pull down whole piston, only need pull out the screw from the piston and tear the connecting piece down and can change, promoted the change efficiency of connecting piece.

In the plunger pump variable displacement mechanism, the side part of the connecting piece is provided with a matching groove, and the end part of the tightening piece is provided with a tightening part matched with the matching groove in shape.

When placing the connecting piece, aim at the mounting hole with the cooperation groove of connecting piece lateral part, will push up tight piece again and install to the mounting hole in, and push up tight portion top at the cooperation inslot, because the shape phase-match in the tight portion in top of tight piece tip and cooperation groove, so under the prerequisite of guaranteeing the convenient change of connecting piece for push up tight piece is more stable in the tight connecting piece in top.

In the above plunger pump variable displacement mechanism, the inner wall of the engagement groove is a tapered surface.

The cooperation inslot wall is the conical surface for top tight connecting piece cooperation groove time centering more easily of piece, under the prerequisite of guaranteeing the convenient change of connecting piece, guaranteed simultaneously that the connecting piece is pushed up tight stability.

In the above plunger pump variable displacement mechanism, as another technical solution, the inner wall of the engagement groove is a spherical surface.

The cooperation inslot wall is the sphere for under the prerequisite of guaranteeing the convenient change of connecting piece, the piece of pushing up is more stable slick and sly when pushing up tight connecting piece cooperation groove, has reduced the wearing and tearing between tight portion in top and the cooperation groove.

In the above plunger pump variable displacement mechanism, the linkage structure includes a connecting groove on the swash plate and a connecting part corresponding to one end of the connecting part and being spherical, and the connecting part is located in the connecting groove.

One end of the connecting piece is a spherical connecting part, and the connecting groove on the swash plate corresponds to the connecting part, so that the connecting part can be clamped into the connecting groove on the swash plate after the connecting piece is fixed on the piston through the jacking piece, one end of the connecting piece is fixed with the swash plate, and when the piston reciprocates, the connecting piece can drive the swash plate to move through the linkage structure, so that the purpose of changing the variable of the plunger pump by changing the angle between the swash plate and the piston is achieved. Because connecting portion are globular, so connecting portion and spread groove are the ball line contact, have improved wearability and control accuracy when reducing assembly error.

In the plunger pump variable displacement mechanism, the control valve comprises a control rod which is parallel to the piston and can move, the linkage structure comprises a linkage rod, one end of the linkage rod is hinged with the control rod, the other end of the linkage rod is provided with a spherical linkage part, a corresponding end part of the connecting piece is provided with a linkage groove, and the linkage part is positioned in the linkage groove.

The other end of the connecting piece is provided with a linkage groove, when the connecting piece is fixed on the piston through the jacking piece, one end of the linkage rod with the spherical linkage part can be clamped into the linkage groove, the other end of the linkage rod is hinged with the control rod in the control valve, and the control rod can move, so that when the piston reciprocates, the connecting piece drives the linkage rod to swing, and the linkage rod drives the control rod to move in the control valve, thereby realizing the action of the control valve. Because the linkage part is spherical, the linkage part is in ball-line contact with the linkage groove, the assembly error is reduced, and meanwhile, the wear resistance and the control precision are improved.

Compared with the prior art, this plunger pump variable mechanism is fixed in the mounting hole of piston through the piece of top is dismantled to the connecting piece to the realization is taken place to damage the back when the connecting piece, need not singlehanded fixed connection spare and another hand and takes off the purpose that just can conveniently change the connecting piece fast with whole piston, and the cooperation groove that matches is mutually held up with the top on the tight portion in top and the connecting piece simultaneously on the tight piece makes the connecting piece more firm reliable at the piston internal fixation.

Drawings

FIG. 1 is a schematic structural diagram of the variable displacement mechanism of the plunger pump;

FIG. 2 is a schematic structural diagram of a housing and a piston in the variable displacement mechanism of the plunger pump;

FIG. 3 is a schematic structural diagram of a connecting piece in the variable mechanism of the plunger pump;

FIG. 4 is a front view of a linkage rod in the second linkage structure;

FIG. 5 is a left side view of the linkage rod in the second linkage structure.

In the figure, 1, a housing; 1a, a piston hole; 1b, a communication hole; 2. a piston; 2a, a first part; 2b, a second part; 2c, assembling holes; 2d, mounting holes; 3. a connecting member; 3a, a matching groove; 3b, a connecting part; 3c, a linkage groove; 4. a top tightening member; 4a, a jacking part; 5. a linkage structure I; 6. a linkage structure II; 7. a swash plate; 7a, connecting grooves; 8. a linkage rod; 8a, a linkage part; 9. a control valve; 9a, a control lever.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1 to 2, the variable displacement mechanism of the plunger pump includes a housing 1, a swash plate 7, a control valve 9, and a piston 2, wherein a piston hole 1a through which the piston 2 is inserted is provided in the housing 1, the piston 2 is mountable in the piston hole 1a, a communication hole 1b intersecting the piston hole 1a in a cross shape is also provided in the housing 1, an axis of the piston hole 1a and an axis of the communication hole 1b in the housing 1 are perpendicular to each other, the piston hole 1a penetrates through a peripheral wall of the communication hole 1b, and when the piston 2 is mounted such that the piston 2 is inserted in the piston hole 1a in the housing 1, a part of the piston 2 is located in the communication hole 1b, that is, the piston 2 radially penetrates through the peripheral wall of the communication hole 1 b. Specifically, the piston 2 includes a first portion 2a and a second portion 2b, the outer diameter of the second portion 2b is larger than the outer diameter of the first portion 2a, a mounting hole 2c is radially provided on the second portion 2b of the piston 2 at a position close to the first portion 2a, a mounting hole 2d vertically communicating with the mounting hole 2c is provided on the second portion 2b of the piston 2 (the mounting hole 2d is provided on an end surface of the second portion 2b away from the first portion 2a, which can reduce the coaxiality error between the first portion 2a and the second portion 2b when the piston 2 moves, thereby improving the stability of the variable), the mounting hole 2c is also provided in the communication hole 1b when the piston 2 is mounted, the connecting member 3 is placed in the communication hole 1b at this time, specifically, the connecting member 3 is in a round rod shape, and the mounting hole 2c is a hole adapted to the connecting member 3, after the connecting member 3 is placed, one end of a detachable jacking piece 4 in the mounting hole 2d is propped against the connecting piece 3, so that the connecting piece 3 can be detachably fixed on the piston 2. After the connecting piece 3 is limited and fixed by the tightening piece 4, the swash plate 7 and the control valve 9 are arranged at two ends of the connecting piece 3 (namely arranged at two sides of the communicating hole 1b), and the swash plate 7 and the control valve 9 can be driven to be linked through the connecting piece 3 when the piston 2 reciprocates, so that the swash plate 7 swings to realize the variable of the plunger pump and the movement of the control valve 9. When dismantling piston 2, through pulling down the tight piece 4 in top of the tight connecting piece 3 for connecting piece 3 loses the effort of pushing down piece 4, just can pull out piston 2 with connecting piece 3, thereby realizes the purpose of changing connecting piece 3. In general, the threaded connection may be more convenient to replace, but in the technical field, during assembly, due to the limitation of the pump body of the hydraulic pump, the threaded connection between the shifting block and the piston 2 leads to time and labor consumption during disassembly and assembly, and after the piston 2 is assembled with the shifting block, when the piston 2 moves, the coaxial error of the diameters of the two ends of the piston 2 is increased due to the objective form and position error, so that the piston 2 generates a clamping stagnation phenomenon during movement in the piston hole 1a, but in the invention, the connecting piece 3 is radially fixed on the assembly hole 2c in the piston 2 through the jacking piece 4, when the connecting piece 3 is worn and needs to be replaced, the disassembly between the connecting piece 3 and the piston 2 can be realized only by disassembling the jacking piece 4, so that the invention not only can ensure the coaxiality of the piston 2 during the operation of the hydraulic pump, but also improves the convenience for replacing the connecting piece 3, And time and labor are saved.

Further, as shown in fig. 1 to 5, after the connecting member 3 is fixed in the assembling hole 2c of the piston 2, both ends of the connecting member 3 extend out of both end openings of the assembling hole 2c, and one end of the connecting member 3 is connected to the swash plate 7 through the linking structure one 5, specifically, the linking structure one 5 includes a connecting groove 7a provided on the swash plate 7 and a connecting portion 3b in a spherical shape, the spherical connecting portion 3b can be snap-fitted into the connecting groove 7a, so that the spherical surface of the connecting portion 3b and the side wall in the connecting groove 7a are attached to each other, so that one end of the connecting member 3 and the swash plate 7 are fixed to each other, (since the connecting portion 3b is in a spherical shape, the connecting portion 3b and the connecting groove 7a are in a spherical line contact, the wear resistance and the control accuracy are improved while the assembling error is reduced) when the piston 2 reciprocates, the connecting member 3 can drive the swash plate 7 to move through the linking structure one 5, therefore, the purpose of changing the variable of the plunger pump by changing the angle between the swash plate 7 and the piston 2 is achieved. The other end of the connecting piece 3 is connected with the control valve 9 through a second connecting structure, concretely, the second connecting structure 6 comprises a linkage rod 8, one end of the linkage rod 8 is provided with a spherical linkage part 8a, as one end of the connecting piece 3 is provided with a linkage groove 3c corresponding to the linkage part 8a, the spherical linkage part 8a is clamped into the linkage groove 3c on the connecting piece 3, the spherical surface of the linkage part 8a is attached to the side wall in the linkage groove 3c, one end of the linkage rod 8 is fixed with the connecting piece 3, as the linkage part 8a is spherical, the linkage part 8a is in spherical line contact with the linkage groove 3c, the assembly error is reduced, the wear resistance and the control precision are improved, meanwhile, the other end of the linkage rod 8 is hinged with the control rod 9a in the control valve 9, and the control rod 9a is parallel to and movable with the installed piston 2, so when the piston 2 reciprocates, the connecting piece 3 drives the linkage rod 8 to swing, and the linkage rod 8 drives the control rod 9a to move in the control valve 9, so that the action of the control valve 9 is realized.

As shown in fig. 1 and 3, further, the side portion of the connecting member 3 is provided with a matching groove 3a with a conical inner wall, the end portion of the tightening member 4 is provided with a tightening portion 4a matched with the matching groove 3a in shape, when the connecting member 3 is placed, the matching groove 3a of the side portion of the connecting member 3 is aligned with the mounting hole 2d, and the tightening member 4 is mounted in the mounting hole 2d, so that the tightening portion 4a is pressed against the matching groove 3a, and the tightening portion 4a of the end portion of the tightening member 4 is matched with the matching groove 3a in shape, so that the tightening member 4 is more stable when pressing against the connecting member 3 on the premise of ensuring the convenient replacement of the connecting member 3.

As shown in fig. 1, further, the mounting hole 2d is a threaded hole, the tightening member 4 is a screw screwed into the mounting hole 2d, and the threaded surfaces of the threaded hole and the screw are coated with a fastening glue, so that the screw is prevented from loosening during the movement of the piston 2, and the stability is improved.

Example two

The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: the inner wall of the matching groove 3a is a spherical surface, and the inner wall of the matching groove 3a is a spherical surface, so that under the premise of ensuring the convenient replacement of the connecting piece 3, the jacking piece 4 is more stable and smooth when the matching groove 3a of the jacking connecting piece 3 is matched, and the abrasion between the jacking part 4a and the matching groove 3a is reduced.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.