CN105257525B - A kind of pump rocker resetting-mechanism - Google Patents

Abstract

The invention discloses a swing frame reset mechanism for a pump, which comprises a swing frame, a steel ball, a right spring seat, a spring, a left spring seat and a ball seat. Cooperate to form the right end ball hinge, the spherical groove of the left spring seat cooperates with the convex hemispherical surface of the ball seat to form the left end ball hinge, the right spring seat and the left spring seat form the piston structure, the spring is installed on the right spring seat and the left spring seat cooperates Position, and pressed between the right spring seat and the left spring seat. The invention provides a scheme that the ends of the left and right spring seats are designed as spherical hinge structures, and the two spring seats are matched with piston structures. The new structure eliminates the radial displacement in the relative movement of the left and right spring seats, and avoids the scratching and friction between the spring and the end of the spring seat. At the same time, the movement of the reset mechanism can be adjusted by changing the number and diameter of the oil drain holes on the spring seat. characteristics to improve pump performance.

Description

A swing frame reset mechanism for a pump

technical field

The invention relates to a swing frame reset mechanism for a pump, which is suitable for a swash plate swing angle self-adaptive reset mechanism of a swash plate type constant pressure variable plunger pump, and belongs to the technical field of plunger pump design.

Background technique

When the constant pressure variable plunger pump (hereinafter referred to as the pump) is working, the internal swing frame can rotate slightly around its own rotation axis to meet the external working conditions. As shown in Figure 1, the swing frame 1 can swing clockwise around point O under the drive of the piston 2, and the spring 4 can drive the swing frame 1 to swing counterclockwise through the right spring seat 3, and the swing angle θ is generally 0-20° . Right spring seat 3, spring 4 and left spring seat 5 form a kind of conventional pendulum reset mechanism. This reset mechanism has a fundamental shortcoming, as shown in Figure 2, that is, due to the rotation of the right spring seat 3 with the pendulum, a radial displacement H is generated relative to the left spring seat 5 in addition to the axial displacement.

In order to prevent spring deflection, there is generally only a small gap between the right spring seat and the inner spring inner wall. The existence of the radial displacement H makes the end of the right spring easily scratch against the inner wall of the inner spring. As shown in Figure 3, the larger the swing angle θ is, the more serious the scratch will be. It is easy to break, causing the reset mechanism to fail.

Contents of the invention

The technical problem of the present invention is: to overcome the deficiencies in the prior art, the present invention provides a scheme in which the ends of the left and right spring seats are designed as spherical hinge structures, and the two spring seats are matched with a piston hole-piston rod structure. The new structure eliminates the radial displacement in the relative movement of the left and right spring seats, and avoids the scratching and friction between the spring and the end of the spring seat. At the same time, the movement of the reset mechanism can be adjusted by changing the number and diameter of the oil drain holes on the spring seat. characteristics to improve pump performance.

Technical solution of the present invention is:

A pendulum reset mechanism for a pump, including a pendulum, a steel ball, a right spring seat, a spring, a left spring seat and a ball seat. The steel ball is fixed on the pendulum and cooperates with the spherical groove of the right spring seat to form the right end Ball hinge, the spherical groove of the left spring seat cooperates with the convex hemispherical surface of the ball seat to form the left end ball hinge, the bottom surface of the ball seat is fixed on the swing frame, the right spring seat and the left spring seat form a piston structure, the spring is set and pressed on Between the right spring seat and the left spring seat.

In the aforementioned pendulum reset mechanism for a pump, the swing angle of the pendulum is 0-19°.

In the aforementioned pendulum reset mechanism for a pump, the right spring seat is a piston sleeve, and the left spring seat is a piston rod. Alternatively, the right spring seat is a piston rod, and the left spring seat is a piston sleeve.

In the aforementioned pendulum reset mechanism for pumps, the right spring seat is provided with a small hole near the steel ball, and by setting the number and diameter of the small holes reasonably, the flow of the working fluid inside the piston hole is realized.

In the aforementioned pendulum reset mechanism for pumps, the material of the right spring seat and the left spring seat is wear-resistant structural steel.

In the aforementioned pendulum reset mechanism for pumps, the depth of the spherical groove of the left spring seat is smaller than the height of the convex hemispherical surface of the ball seat.

In the aforementioned pendulum reset mechanism for pumps, the material of the ball seat is wear-resistant structural steel.

The beneficial effect of the present invention compared with prior art is:

1. The present invention eliminates the radial displacement in the relative movement of the left and right spring seats, avoids the scratching and wear of the spring and the ends of the spring seats, and ensures the stability of the reset mechanism.

2. The present invention can improve the performance of the pump by changing the number and diameter of the oil drain holes on the spring seat, adjusting the motion characteristics of the reset mechanism.

3. The piston structure composed of the left and right spring seats of the present invention prolongs the service life of the reset mechanism.

Description of drawings

Figure 1 is a schematic diagram of the swing angle structure of the pump swing frame

Figure 2 is a schematic diagram of the movement of the reset mechanism

Figure 3 is a schematic diagram of the interference point of the spring seat on the movement of the inner spring

Fig. 4 is a sectional view of the present invention

Fig. 5 is a sectional view of the right spring seat of the present invention

Among them: 1 swing frame; 2 steel ball; 3 right spring seat; 4 spring; 5 left spring seat; 6 ball seat.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing description and specific embodiment:

As shown in Figure 4, a pendulum reset mechanism for a pump includes a pendulum 1, a steel ball 2, a right spring seat 3, a spring 4, a left spring seat 5 and a ball seat 6, and the steel ball 2 is fixed on the pendulum 1 , and cooperate with the spherical groove of the right spring seat 3 to form a right-end spherical hinge, the spherical groove of the left spring seat 5 cooperates with the convex hemispherical surface of the ball seat 6 to form a left-end spherical hinge, and the bottom surface of the ball seat 6 is fixed on the swing frame 1 Above, the right spring seat 3 and the left spring seat 5 form a piston structure, the spring 4 is set and pressed between the right spring seat 3 and the left spring seat 5, the swing angle of the swing frame 1 is 0-19°, the right spring seat 3 And the material of left spring seat 5 adopts wear-resistant structural steel, and the spherical groove depth of left spring seat 5 is 2mm, and the convex hemispherical surface highest point height of ball seat 6 is 3mm, and ball seat 6 materials adopt wear-resistant structural steel.

As shown in Figure 5, the right spring seat 3 is a piston sleeve, the left spring seat 5 is a structure of a piston rod, and the right spring seat 3 has a small hole near the steel ball 2, and the number of small holes is set to 2.

The working principle of the present invention is:

Utilizing the ball joints at the left and right ends of the reset mechanism, the two spring seats can rotate freely within a certain range, eliminating the radial displacement of the right spring seat 3 relative to the left spring seat 5 when rotating, so that the right spring seat 3 can be avoided. Scratches of springs. The piston structure formed by the left and right spring seats makes the two rotate in unison, ensuring the stability of the spring and the reset mechanism in the rapid expansion and contraction.

The content not described in detail in the description of the present invention is well known to those skilled in the art.

Claims (1)

1. a kind of pump rocker resetting-mechanism, it is characterised in that：Including rocker (1), steel ball (2), right spring base (3), spring (4), left spring seat (5) and ball seat (6), the pivot angle of rocker (1) are 0~19 °, and steel ball (2) is fixed on rocker (1), and with the right side The bulbous recess of spring base (3), which is matched, is combined into right end flexural pivot, the convex hemisphere face of the bulbous recess and ball seat (6) of left spring seat (5) With left end flexural pivot is combined into, the bulbous recess depth of left spring seat (5) is less than the convex hemisphere face height of ball seat (6), ball seat (6) bottom Face is fixed on rocker (1), and right spring base (3) forms piston structure with left spring seat (5), and spring (4) is set with and is pressed on the right side Between spring base (3) and left spring seat (5), right spring base (3) is provided with aperture close to the position of steel ball (2), and the quantity of aperture is not Less than 2, the material of right spring base (3), left spring seat (5) and ball seat (6) is all made of abrasion-proof structure steel；The right spring base (3) it is piston sleeve, left spring seat (5) is piston rod, or uses right spring base (3) for piston rod, and left spring seat (5) is piston Sleeve.