CN204371576U - A kind of axial variable displacement plunger pump - Google Patents

Abstract

The utility model relates to a variable variable axial plunger pump, which comprises a plunger pump body and a transmission shaft running through the plunger pump body. The plunger pump body is composed of a front variable part, a middle pump body and a rear pump cover. The front end of the transmission shaft protrudes from the variable portion and is supported in the variable portion by a bearing assembly A, and the rear end extends into the pump cover and is supported by a bearing assembly B in the pump cover. The pump cover has an oil inlet There is an oil outlet and an oil outlet, and an oil distribution plate is arranged between the pump cover and the pump body. There are two oil suction and discharge chambers connected to the oil inlet and the oil outlet on the oil distribution plate. The utility model has the advantages that: the plunger pump of the utility model has compact structure, small output flow pulsation, stable output, no vibration and low noise at high speed.

Description

A Variable Axial Piston Pump

technical field

The utility model relates to a plunger pump, in particular to a variable variable axial plunger pump.

Background technique

The plunger pump is an important device in the hydraulic system. It relies on the reciprocating movement of the plunger in the cylinder to change the volume of the sealed working chamber to realize oil absorption and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment, and is widely used in high pressure, large flow and flow adjustment occasions, such as hydraulic presses, engineering machinery and ships.

Axial piston pump (English name: Piston pump) is a piston pump in which the reciprocating direction of the piston or plunger is parallel to the central axis of the cylinder. The axial piston pump works by using the volume change caused by the reciprocating movement of the plunger parallel to the transmission shaft in the plunger hole. Since both the plunger and the plunger hole are circular parts, high precision fit can be achieved during processing, so the volumetric efficiency is high.

The currently used axial piston pump has a complex main body structure and a large volume, and when the main body is working, its performance is unstable, and vibration and noise will be generated after high-speed operation.

Contents of the invention

The technical problem to be solved by the utility model is to provide a variable variable axial plunger pump with stable performance.

In order to solve the above technical problems, the technical solution of this utility model is: a variable axial plunger pump, the innovation point of which is: including the plunger pump body and the transmission shaft running through the plunger pump body, the plunger pump body It is composed of the front variable part, the middle pump body and the rear pump cover. The front end of the transmission shaft extends out of the variable part and is supported in the variable part by a bearing assembly A, and the rear end extends into the pump cover and is supported by a bearing assembly B is supported in the pump cover; the pump cover has an oil inlet and an oil outlet, and an oil distribution plate is arranged between the pump cover and the pump body. The oil suction and discharge chamber communicated with the oil outlet; the variable portion includes a variable housing, a variable adjustment mechanism, and an adjustable variable head and bearing bushes that are adjacently set on the transmission shaft. The outer arc surface of the variable head and the bearing bush The inner arc-shaped surface of the pump body is fitted with a sliding connection, and is driven by the variable adjustment mechanism to slide on the inner arc-shaped surface of the bearing bush, thereby changing the inclination angle between the variable head and the drive shaft; the pump body has a built-in cylinder with a concave spherical rear end surface , the cylinder body is set on the transmission shaft, and the rear spherical surface is against the front side of the oil distribution plate. There are nine plunger holes whose axes are parallel to the axis of the cylinder body evenly distributed in the ring, and have an oil inlet and outlet connected to the oil suction and discharge chamber on the oil distribution plate; a plunger that slides with it is installed in each plunger hole , the front end of the plunger protrudes from the plunger hole and is connected to the sliding shoe, and the transmission shaft is also provided with a return mechanism that presses the sliding shoe on the surface of the variable head; the return mechanism includes a return plate, a spherical hinge, and a Gasket A, return spring and bushing in the cavity between the inner hole of the cylinder and the drive shaft. Between them, several thimbles are circularly distributed on the front end surface of the gasket A, and the front end of the thimble is against the ball hinge; the center of the return plate has a central hole, and there are several sliding shoes corresponding to the sliding shoes around it. The mounting hole, the ball hinge and the sliding shoe respectively protrude into the center hole of the return plate and the mounting hole of the sliding shoe, and the return spring is pressed on the plane of the variable head through the thimble; there is a small spring on the bushing, Its front end has an annular boss, the rear end is against the front side of the oil distribution plate, and the rear end is connected with the inner hole of the cylinder body by a circlip. The front side of the circlip has a gasket B, which is on the sleeve There is a small spring, and the small spring is limited between the annular boss at the front end of the shaft sleeve and the gasket B, and then the cylinder body is pressed against the spherical surface of the oil distribution plate.

Further, the variable adjustment mechanism includes a variable valve and a shift block, the variable valve is arranged perpendicular to the direction of the transmission shaft, the variable piston of the variable valve has an inwardly extending dial column, and the shift block is fixed on the outside of the variable head, The shifting block has a through hole for accommodating the shifting column. One end of the shifting post is vertically fixed on the inner side of the variable piston, and the other end extends inward into the through hole of the shifting block, and drives the shifting block to drive the variable head to arc on the inner side of the bearing bush. Sliding on the surface.

The utility model has the advantages that: the plunger pump of the utility model is composed of the front variable part, the middle pump body and the rear pump cover, with compact structure, small output flow pulsation and stable output; The cylinder is held on the variable head by the return plate, which makes several plungers in the rotary cylinder rotate synchronously at high speed, and there is no vibration and low noise during rotation; The ball joint and the variable head are pressed on the oil distribution plate with a small spring, which strengthens the structure of the rotary cylinder and makes the performance of the plunger pump more stable.

The variable adjustment mechanism of the variable head of the plunger pump of the utility model drives the variable head to slide on the inner arc surface of the bearing bush by the variable piston of the variable valve, and then changes the inclination angle of the variable head and the transmission shaft to realize the adjustment of the variable head. Simple and easy to adjust.

Description of drawings

Fig. 1 is a transverse sectional view of a variable axial plunger pump of the present invention.

Fig. 2 is a longitudinal sectional view of a variable axial plunger pump of the present invention.

Fig. 3 is a cross-sectional view along line A-A of Fig. 1 .

Detailed ways

As shown in Figures 1 to 3, the utility model discloses a variable axial plunger pump, which includes a plunger pump body and a transmission shaft 1 running through the plunger pump body, the plunger pump body is controlled by a front variable 2, the middle pump body 3 and the rear pump cover 4. The front end of the transmission shaft 1 protrudes from the variable part 2 and is supported by the bearing assembly A in the variable part 2. The rear end extends into the pump cover 4 and is supported by a The bearing assembly B is supported in the pump cover 4 ; in this embodiment, the bearing assembly A is a cylindrical roller bearing 5 , and the bearing assembly B is composed of two sets of cylindrical roller bearings 6 .

There is an oil inlet 7 and an oil outlet 8 on the pump cover 4, and an oil distribution plate 10 is arranged between the pump cover 4 and the pump body. The oil suction and discharge chamber 9 connected by the oil port 8.

The variable part 2 includes a variable housing, a variable adjusting mechanism, and an adjustable variable head 11 and a bearing bush 12 that are adjacently set on the transmission shaft 1. The outer arc surface of the variable head 11 is slidably connected with the inner arc surface of the bearing bush 12. And it is driven by the variable adjustment mechanism to slide on the inner arc surface of the bearing bush 12, thereby changing the inclination angle between the variable head 11 and the transmission shaft 1; the variable adjustment mechanism includes a variable valve 13 and a dial 14, and the variable valve 13 is perpendicular to the transmission Set in the direction of axis 1, the variable piston 15 of the variable valve 13 has a dial 16 extending inward, the dial 14 is fixed on the outside of the variable head 11 by bolts 32, and the dial 14 has a through hole 17 for accommodating the dial 16 One end of the shifting column 16 is vertically fixed on the inner side of the variable piston 15, and the other end extends inwardly into the through hole 17 of the shifting block 14, and drives the shifting block 14 to drive the variable head 11 to slide on the inner arc surface of the bearing bush 12.

The pump body 3 has a built-in cylinder 18 whose rear end surface is a concave spherical surface. The cylinder 18 is set on the transmission shaft 1, and the rear end spherical surface is against the front side of the oil distribution plate 10. The inner hole 25 of the cylinder is connected to the transmission shaft 1. Connected and driven by the transmission shaft 1 to rotate around the axis.

Nine plunger holes 19 whose axes are parallel to the axis of the cylinder body 18 are evenly distributed in a circular shape on the end face of the cylinder body 18, and have an oil inlet and outlet 21 connected with the oil suction and discharge chamber 9 on the oil distribution plate 10; each plunger hole 19 are equipped with a plunger 20 slidingly fitted with it. The front end of the plunger 20 protrudes from the plunger hole 19 and connects with the sliding shoe 22. The transmission shaft 1 is also provided with a return stroke for pressing the sliding shoe 22 on the surface of the variable head 11. mechanism.

The return mechanism includes a return disc 23, a ball hinge 24, a gasket A26, a return spring 27 and a bushing 28 which are sequentially arranged in the cavity between the cylinder bore 25 and the transmission shaft 1, and the ball hinge 24 is set in the cylinder bore. On the front end port of 25, the return spring 27 is limited between the gasket A26 and the shaft sleeve 28, and several thimbles 28 are distributed in a ring on the front end surface of the gasket A26, and the front ends of the thimbles 28 are against the ball hinge 24; The center of the disk 23 has a central hole, and there are several sliding shoe mounting holes corresponding to the sliding shoe 22 around. The return spring 27 is pressed on the plane of the variable head 11 through the thimble 28; there is a small spring 29 on the bushing 28, the front end has an annular boss, and the rear end is against the front side of the oil distribution plate 10, and the rear end is formed by a The circlip 30 for the hole is connected with the inner hole of the cylinder body 18. The front side of the circlip 30 for the hole has a gasket B31, and there is a small spring 29 on the bushing 28. The small spring 29 is limited in the ring at the front end of the bushing 28. Between the boss and the gasket B31, the cylinder body 18 is pressed against the spherical surface of the oil distribution plate 10.

working principle:

Adjustment: adjust the variable valve, the variable piston drives the column to move, thereby driving the variable head to slide on the inner arc surface of the bearing bush, and then changing the inclination angle between the variable head and the transmission shaft to realize flow adjustment;

Work: The drive shaft drives the cylinder body to rotate, thereby driving the plunger in the cylinder body to rotate on the end face of the variable head and move axially under the action of the variable head, so as to successfully complete oil absorption and oil discharge.

The above shows and describes the basic principle and main features of the present utility model and the advantages of the present utility model. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (2)

1. an axial variable displacement plunger pump, it is characterized in that: comprise plunger pump body and be applied in the intrinsic transmission shaft of plunger pump, this plunger pump body is made up of anterior variable portion, the middle part pump housing and rear portion pump cover, the front end of described transmission shaft is stretched out variable portion and one is supported in this variable portion by bearing unit A, and rear end to extend in pump cover and is supported in this pump cover by a bearing unit B;

Described pump cover has a filler opening and an oil outlet, between pump cover and the pump housing, be provided with oil distribution casing, this oil distribution casing has two suction oil pockets be communicated with oil outlet with filler opening respectively;

Described variable portion comprises variable shell, variable controlling mechanism and is adjacently sleeved on adjustable variables head on transmission shaft and bearing shell, the outer arcuate face of described variable head coordinates with the inner side arc shaped surface of bearing shell and is slidably connected, and drive it to slide on the inner side arc shaped surface of bearing shell by variable controlling mechanism, and then change the inclination angle of variable head and transmission shaft;

The built-in ear end face of the described pump housing is the cylinder body of concave spherical surface, and this cylinder body is sleeved on transmission shaft, and rear end sphere is against the front side of oil distribution casing, and cylinder inner bore is connected with transmission shaft bond and drives it to pivot by transmission shaft;

The end face of described cylinder body is evenly distributed with ringwise the plunger hole of nine axis and Boring mill line parallel, and has one and be communicated with oil inlet and outlet with suction oil pocket on oil distribution casing; All install a plunger be slidably matched with it in described each plunger hole, this plunger front end is stretched out plunger hole and connects piston shoes, described transmission shaft is also provided with return mechanism piston shoes being pressed on variable head surface;

Described return mechanism comprises return plate, ball pivot and is successively set on pad A, retracting spring and the axle sleeve between cylinder inner bore and transmission shaft in cavity, described ball pivot is sleeved on cylinder inner bore front-end port, described retracting spring is spacing between pad A and axle sleeve, the anterior end surface of pad A is distributed with several thimble ringwise, and the front end of this thimble props up ball pivot;

The center of described return plate has a center hole, and surrounding has several piston shoes mounting hole corresponding with piston shoes, and described ball pivot and piston shoes stretch into respectively in the center hole and piston shoes mounting hole of return plate, and are pressed in the plane of variable head by retracting spring by thimble;

Described axle sleeve has a little spring, its front end has an annular boss, rear end is against the front side of oil distribution casing, and rear end is connected with the endoporus of cylinder body by a jump ring, there is on front side of described jump ring a pad B, axle sleeve has a little spring, and this little spring is spacing between axle sleeve front end annular boss and pad B, and then is pressed on the sphere of oil distribution casing by cylinder body.

2. axial variable displacement plunger pump according to claim 1, it is characterized in that: described variable controlling mechanism comprises variable flow valve and shifting block, this variable flow valve is arranged perpendicular to transmission shaft direction, the variable piston of variable flow valve has a reversed column extended internally, described shifting block is fixed on the outside of variable head, shifting block has the through hole of an accommodation reversed column, described reversed column one end is vertically fixed on the inner side of variable piston, the other end inwardly stretches in the through hole of shifting block, and drives shifting block to drive variable head to slide on the inner side arc shaped surface of bearing shell.