CN218493739U

CN218493739U - Plunger return stroke structure of through shaft type axial plunger pump

Info

Publication number: CN218493739U
Application number: CN202222593595.9U
Authority: CN
Inventors: 潘慧山; 徐敏; 林结祥
Original assignee: Suzhou Liyuan Hydraulic Co ltd
Current assignee: Suzhou Liyuan Hydraulic Co ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-02-17
Anticipated expiration: 2032-09-29

Abstract

The utility model discloses a plunger return stroke structure of through-shaft type axial plunger pump, including main shaft (1), return stroke dish (4), ball pivot (3), piston shoes (5), cylinder body (8), be equipped with the plunger hole on cylinder body (8), the downthehole plunger body (7) that is equipped with of plunger, the terminal surface that the plunger body (7) is located the plunger hole inside is equipped with first permanent magnetic ring (11), one side second permanent magnetic ring (12) of first permanent magnetic ring (11), and second permanent magnetic ring (12) are fixed with the bottom surface in plunger hole, and the polarity of first permanent magnetic ring (11) is opposite with the polarity direction of second permanent magnetic ring (12); the area of the first permanent magnet ring (11) is equal to that of the second permanent magnet ring (12), and the first permanent magnet ring (11) and the second permanent magnet ring (12) are coaxial. The utility model has the advantages of long service life and difficult failure of the plunger pump.

Description

Plunger return stroke structure of through shaft type axial plunger pump

Technical Field

The utility model belongs to lead to shaft type axial plunger pump field, especially relate to a lead to plunger return stroke structure of shaft type axial plunger pump.

Background

The through-shaft type axial plunger pump is one of positive displacement hydraulic pumps, and has wide application in the fields of agricultural machinery, engineering machinery, metallurgy, aviation and the like due to compact structure, small radial dimension and small rotational inertia.

The through-shaft type axial plunger pump (plunger pump for short) generally has a plunger return structure, and has the functions of helping to lift a plunger out of a plunger cavity in the oil absorption process, completing oil absorption work and ensuring that a sliding shoe is well attached to a swash plate. The existing plunger return structure completely depends on a return disc to provide return force for the plunger, so that when the plunger pump runs at high speed, the working load of the return disc is overlarge, and the plunger return structure is easy to wear, so that the service life of the plunger return mechanism is short. In addition, current plunger return stroke structure relies on the return stroke dish to drive the piston shoe, drives the plunger body by the piston shoe again, when meetting the sky operating mode, will have great separating force between piston shoe and the plunger body, can lead to the plunger body to pull off with the piston shoe when serious, and then causes the plunger pump to become invalid.

Therefore, the existing plunger return structure has the defects of short service life and easy failure of the plunger pump when encountering the suction working condition.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a through shaft type axial plunger pump's plunger return stroke structure. The utility model has the advantages of long service life and difficult failure of the plunger pump.

The technical scheme of the utility model: a plunger return structure of a through shaft type axial plunger pump comprises a main shaft, a return plate, a spherical hinge, a sliding shoe and a cylinder body, wherein a plunger hole is formed in the cylinder body, a plunger body is arranged in the plunger hole, a first permanent magnet ring is arranged on the end face, located inside the plunger hole, of the plunger body, a second permanent magnet ring is arranged on one side of the first permanent magnet ring and fixed with the bottom face of the plunger hole, and the polarity of the first permanent magnet ring is opposite to the polarity of the second permanent magnet ring.

In the plunger return structure of the through-shaft axial plunger pump, the area of the first permanent magnet ring is equal to that of the second permanent magnet ring, and the first permanent magnet ring and the second permanent magnet ring are coaxial.

In the plunger return structure of the through-shaft type axial plunger pump, the first permanent magnet ring and the second permanent magnet ring are made of neodymium iron boron.

In the plunger return structure of the through-shaft type axial plunger pump, a spring is arranged between the main shaft and the cylinder body, a first gasket is arranged at the inner side end of the spring, the first gasket is elastically connected with the spherical hinge through a support pin, a second gasket is arranged at the outer side end of the spring, and a retainer ring connected with the cylinder body is arranged at the outer side of the second gasket.

In the plunger return structure of the through-shaft type axial plunger pump, the spherical hinge and the cylinder body are connected with the main shaft through splines.

Compared with the prior art, the utility model discloses a make following improvement on the basis of current plunger return stroke mechanism: the plunger piston has the advantages that the magnetic device is added, namely the first permanent magnetic ring and the second permanent magnetic ring, the plunger piston body can be lifted out of the plunger piston hole together by the aid of the return disc, the abrasion degree of parts such as the return disc is reduced, the service life of the plunger piston return mechanism is prolonged, in addition, when the plunger pump meets the air suction working condition, the separating force between the plunger piston body and the sliding shoe can be reduced, the pulling-off of the plunger piston body and the sliding shoe is avoided, and the failure of the plunger pump is prevented. Therefore, the utility model has the advantages of long service life and difficult cause the plunger pump to become invalid.

Drawings

Fig. 1 is a front view structure diagram of the present invention.

Fig. 2 is a schematic view when the plunger body is embedded in the first annular permanent magnet.

Fig. 3 is a schematic view when a second annular permanent magnet is embedded on the bottom surface of the plunger hole of the cylinder.

Fig. 4 is a force analysis diagram of the present invention.

The labels in the figures are: the device comprises a main shaft 1, a swash plate 2, a spherical hinge 3, a return plate 4, a slipper 5, a supporting pin 6, a plunger 7, a cylinder 8, a first gasket 9, a spring 10, a first permanent magnet ring 11, a second permanent magnet ring 12, a second gasket 13 and a retainer ring 14.

Detailed Description

The present invention will be further described with reference to the drawings and examples, which should not be construed as a limitation to the present invention.

Examples are given. A plunger return structure of a through shaft type axial plunger pump is shown in figure 1 and comprises a main shaft 1, a swash plate 2, a return plate 4, a spherical hinge 3, a sliding shoe 5, a supporting pin 6, a plunger body 7, a cylinder body 8, a first gasket 9, a spring 10, a first permanent magnet ring 11, a second permanent magnet ring 12, a second gasket 13 and a retainer ring 14.

The main shaft 1 penetrates through the swash plate 2, the return disc 4, the spherical hinge 3 and the cylinder body 8.

The spring 10 is pressed in the cylinder body 8, a first gasket 9 and a second gasket 13 are respectively arranged at the left end and the right end of the spring, and a retainer ring 14 connected with the cylinder body 8 is arranged on the right side of the second gasket 13.

The support pin 6 is disposed in the cylinder 8, and one end of the support pin 6 contacts the first gasket 9 and the other end contacts the ball pivot 3. The ball pivot 3 is located at the left end of the cylinder 8 and is held against by the support pin 6. The swash plate 2 and the cylinder body 8 are under the action of external force, the spring 10 in the cylinder is compressed and transmits pressure to the spherical hinge 3 through the supporting pin 6, the spherical hinge 3 transmits the pressure to the return plate 4, and the return plate 4 presses the slipper 5 on the swash plate 2.

The return disc 4 is arranged on the spherical hinge 3 and is matched with the spherical hinge 3 through a central conical surface hole.

The plunger body 7 is arranged in a plunger hole of the cylinder body 8.

The sliding shoe 5 is hinged with the left end ball of the plunger body 7 and can freely rotate around the left end of the plunger body 7.

The neck of the slipper 5 is positioned in a mounting hole of the slipper 5 on the return disc 4, the right bottom surface of the slipper 5 is tightly attached to the return disc 4, and the left bottom surface of the slipper 5 is tightly attached to the swash plate 2.

An annular first permanent magnet ring 11 is embedded at the bottom of the right side of the plunger body 7, a second permanent magnet ring 12 is embedded at the bottom of the plunger hole of the cylinder body 8, the first permanent magnet ring 11 and the second permanent magnet ring 12 are matched with each other in position, the first permanent magnet ring and the second permanent magnet ring are identical and coaxial in area, and the polarities of the first permanent magnet ring and the second permanent magnet ring are opposite and mutually exclusive.

The spherical hinge 3 and the cylinder body 8 are in splined connection with the main shaft 1. When the main shaft 1 rotates, the spherical hinge 3 and the cylinder body 8 are driven to rotate, the cylinder body 8 drives the plunger body 7 to rotate, and the plunger body 7 is forced to do linear reciprocating motion in the plunger hole while doing rotary motion due to the inclined angle of the plane of the swash plate 2; when the plunger body 7 is taken out of the plunger hole, the plunger hole cavity is continuously enlarged, a working medium is sucked into the plunger hole, when the plunger body 7 is pushed into the plunger hole, the plunger hole cavity is continuously reduced, and the working medium is discharged out of the plunger hole. The first permanent magnet ring 11 and the second permanent magnet ring 12 are Ru Fe B permanent magnets. The first permanent magnet ring 11 and the second permanent magnet ring 12 may be solid block-shaped, but are preferably annular since the magnetic force generated during operation of the plunger pump is unstable.

As shown in fig. 4, the swash plate 2 is subjected to an external supporting force F1, and the cylinder block 8 is subjected to an external supporting force F2; under the action of the F1 and the F2, the spring 10 is in a pressing state, generates a thrust F3 to the second gasket 13 and generates a thrust F4 to the first gasket 9; the thrust F4 is transmitted to the spherical hinge 3 by the supporting pin 6, then is transmitted to the return disc 4 by the spherical hinge 3, and then is transmitted to the slipper 5 by the return disc 4, and finally the slipper 5 is pressed on the swash plate 2; a first permanent magnet ring 11 at the bottom of the plunger body 7 and a second permanent magnet ring 12 in the plunger hole of the cylinder body 8 generate a repulsive force F5; in the initial state, the single plunger body 7 receives a force F6= F5+ F4/N in the axial direction, where N is the number of plungers. In the running process of the plunger pump, the plunger body 7 rotates along with the cylinder body 8, and the plunger body 7 is forced to do linear reciprocating motion in the plunger hole while doing the rotating motion due to the inclined angle of the plane of the swash plate 2; every along with 8 rotatory a week of cylinder body of single plunger body 7, working medium is inhaled to half week wherein, and working medium is got rid of to half week in addition, and the atress condition of inhaling working medium and discharge working medium is different, the utility model discloses a return stroke of plunger, so the atress condition when main analysis plunger body 7 inhales working medium. The plunger piston body 7 is acted by an inertia force P1 because of making an accelerated linear motion during the return stroke; since the pressure in the plunger hole is lower than the atmospheric pressure, the suction force P2 needs to be overcome when the plunger body 7 sucks the medium; because the radial component force exists in the acting force of the swash plate 2 on the sliding shoes 5, the plunger body 7 receives the friction force P3 of the cylinder body 8 when doing reciprocating linear motion; the axial force that needs to be overcome during plunger return stroke is P4= P1+ P2+ P3. In summary, in order to ensure that the slipper 5 can be tightly attached to the swash plate 2 during the plunger return stroke, the condition of F6 > P4 needs to be satisfied.

The utility model discloses a set up magnetic means, first, second permanent magnetism ring promptly, for the plunger inhales the medium process and provides extra return stroke power, alleviate the work load of return stroke dish 4. When the plunger pump takes place to inhale the sky phenomenon, power P2 can increase by a wide margin, if only lean on return stroke dish 4 to help the plunger return stroke, then can lead to producing great separating force between the piston shoes 5 and the plunger body 7, this moment repulsion F5 then can effectively reduce this separating force, avoids the plunger body and piston shoes to pull off, guarantees that the part is not damaged, improves the stability of product operation. In addition, for satisfying different production demands, when changing the 8 materials of cylinder body, frictional force P3 can take place great change to influence other component stress state of product and change, introduce repulsion F5 and can reduce to a certain extent because the influence that the change of frictional force P3 produced other component atress of product.

The utility model discloses a magnetic force provides plunger return force, makes it have following advantage: in the running process of the plunger pump, the magnetic device can assist the return disc 4 to lift the plunger body 7 out of the plunger hole, so that the abrasion degree of parts such as the return disc 4 is reduced, and the service life of the parts is prolonged. Through setting up magnetic means, can reduce the separating force between the plunger body 7 and the piston shoe 5 when the plunger pump meets the operating mode of inhaling sky, reduce and inhale the influence of sky to the plunger pump part, improve the stability of product operation. The utility model provides a plunger return stroke structure directly acts on plunger body 7 with partly return stroke power, can adjust because of part materials such as cylinder body 8 switch, and the plunger atress that design parameter changes and bring changes, has proposed new thinking for the holistic structural design of plunger pump.

The interaction force for the embedded ring-shaped permanent magnet can be derived by the following procedure. The surface field strength of the wafer-like magnet at X (m) from the wafer surface is:

wherein: br is the residual magnetic induction (T) of the permanent magnet; l is the thickness (m) of the wafer; r is the radius (m) of the disc; therefore, the magnetic field strength generated by the annular embedded magnetic pole is as follows:

wherein R is the outer diameter of a single annular embedded magnetic pole; r is the inner diameter of the single annular embedded magnetic pole. The magnetic field strength Hg =2Hi of a pair of permanent magnet rings, and the interaction force is:

F＝NB _r H _g A。

wherein N is the magnetic pole pair number, and N =1; a is the corresponding area (m 2) of a pair of magnetic poles.

In addition, for the selection of the permanent magnet material, a neodymium iron boron permanent magnet is selected. The Nd-Fe-B permanent magnetic material has very high magnetic energy and coercive force and high energy density, so that the Nd-Fe-B permanent magnetic material is widely applied to modern industry and electronic technology.

To sum up, the utility model discloses an axial plunger pump's plunger return stroke structure. On the basis of the structure of a traditional axial plunger pump, permanent magnet rings are embedded in the bottoms of holes of a plunger body 7 and a cylinder body 8 respectively, and the plunger in the oil absorption process can be provided with return force under the action of homopolar repulsive magnetic force. The utility model discloses relative current plunger return stroke structure comes the equilibrium because of the inertia force that the high-speed reciprocating motion of plunger produced and the frictional force between plunger and the cylinder body 8 through magnetic force, has reduced the work load of return stroke dish 4 greatly. Furthermore, the utility model discloses can effectively alleviate and inhale empty operating mode to the influence of axial plunger pump, improve the stability and the security of product operation.

Claims

1. The utility model provides a lead to plunger return stroke structure of shaft type axial plunger pump, includes main shaft (1), return stroke dish (4), ball pivot (3), piston shoes (5), cylinder body (8), is equipped with the plunger hole on cylinder body (8), and the downthehole plunger body (7) that are equipped with of plunger, its characterized in that: the plunger piston is characterized in that a first permanent magnet ring (11) is arranged on the end face of the plunger piston body (7) located inside the plunger piston hole, a second permanent magnet ring (12) is arranged on one side of the first permanent magnet ring (11), the second permanent magnet ring (12) is fixed with the bottom face of the plunger piston hole, and the polarity of the first permanent magnet ring (11) is opposite to the polarity of the second permanent magnet ring (12).

2. The plunger return structure of the through-shaft axial plunger pump according to claim 1, characterized in that: the area of the first permanent magnet ring (11) is equal to that of the second permanent magnet ring (12), and the first permanent magnet ring (11) and the second permanent magnet ring (12) are coaxial.

3. The plunger return structure of the through-shaft axial plunger pump according to claim 1, characterized in that: the first permanent magnet ring (11) and the second permanent magnet ring (12) are made of neodymium iron boron.

4. The plunger return structure of the through-shaft axial plunger pump according to claim 1, characterized in that: a spring (10) is arranged between the main shaft (1) and the cylinder body (8), a first gasket (9) is arranged at the inner side end of the spring (10), the first gasket (9) is elastically connected with the spherical hinge (3) through a supporting pin (6), a second gasket (13) is arranged at the outer side end of the spring (10), and a check ring (14) connected with the cylinder body (8) is arranged at the outer side of the second gasket (13).

5. The plunger return structure of the through-shaft axial plunger pump according to claim 1, characterized in that: the spherical hinge (3) and the cylinder body (8) are in splined connection with the main shaft (1).