CN105715473A - Multi-cylinder high-pressure radial plunger pump - Google Patents

Abstract

The invention belongs to the field of hydraulic devices, and in particular relates to a multi-cylinder high-pressure radial plunger pump, which includes a housing and upper and lower collector plates respectively arranged on the upper and lower end surfaces of the housing. The upper collector plate is provided with several The lower collector plate is provided with several oil outlets, and the center of the housing is provided with an eccentric device and multiple sets of plunger mechanisms distributed circumferentially around the eccentric device; the eccentric device includes a transmission shaft, and the outer casing of the transmission shaft is provided with an eccentric The sleeve and the eccentric sleeve are provided with a first bearing, the first bearing is located at the center of the polygonal transmission member, the side of the polygonal transmission member contacts the plunger mechanism, and the plunger mechanism communicates with the oil suction port and the oil discharge port respectively. The invention is cleverly designed, and the friction loss between the plunger and the polygonal transmission mechanism is reduced through the positioning contact between the polygonal transmission mechanism and the plunger.

Description

A multi-cylinder high-pressure radial piston pump

technical field

The invention belongs to the field of hydraulic devices, in particular to a multi-cylinder high-pressure radial plunger pump.

Background technique

The plunger pump is an important hydraulic device, relying on the eccentric device to drive the plunger to make a linear reciprocating motion in the cylinder, so that the volume of the sealed plunger cavity changes, so as to open the oil suction valve and oil discharge valve at intervals to realize oil suction. and pressure oil work. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment. It is widely used in high pressure, large flow and flow adjustment occasions, such as hydraulic presses, engineering machinery and ships. Piston pumps include axial piston pumps and radial piston pumps. The plunger of the radial piston pump and its reciprocating direction are perpendicular to the drive shaft.

The multi-cylinder high-pressure radial piston pump is equipped with several plunger mechanisms, and several oil outlets can be connected in parallel to realize the high hydraulic pressure demand of the industry. However, the multi-cylinder high-pressure radial piston pump in the prior art has many transmission modes. The eccentric device directly or indirectly interferes with the plunger through the bearing, such as the ultra-high pressure radial plunger pump disclosed by the publication number CN103133291A, the movement track of the plunger on the bearing is a circular line, and this connection method of point and line contact It is easy to cause wear of the plunger and its contacting components. Moreover, in the plunger pump in the prior art, the return spring in the plunger mechanism is arranged in the cylinder body, and the telescoping length of the return spring is limited, so that the provided return force cannot meet the working requirements of the radial plunger pump.

Contents of the invention

The purpose of the present invention is to provide a multi-cylinder high-pressure radial plunger pump. The present invention is cleverly designed, and the friction loss between the plunger and the polygonal transmission mechanism is reduced through the positioning contact between the polygonal transmission mechanism and the plunger.

In order to solve the problems of the technologies described above, the technical scheme adopted in the present invention is as follows:

A multi-cylinder high-pressure radial piston pump is designed, which includes a casing and upper and lower collecting plates respectively arranged on the upper and lower end surfaces of the casing. The upper collecting plate is provided with several oil suction ports, and the lower collecting plate There are several oil outlets, an eccentric device and multiple sets of plunger mechanisms distributed circumferentially around the eccentric device are provided at the center of the housing; A bearing, the first bearing is located at the center of the polygonal transmission component, the side of the polygonal transmission component is in contact with the plunger mechanism, and the plunger mechanism communicates with the oil suction port and the oil discharge port respectively.

Preferably, the number of sides of the polygonal transmission member is the same as the number of the plunger mechanism.

Preferably, the upper collector plate and the lower collector plate are provided with a second bearing for supporting the transmission shaft, and the collector plate corresponding to the second bearing is provided with an end cover.

Preferably, the transmission shaft is keyed to the eccentric sleeve.

Preferably, the plunger mechanism includes a plunger, a cylinder body, an oil suction valve, an oil discharge valve and a return spring, and a plunger cavity is arranged in the cylinder body, and the plunger cavity is connected to the oil suction port and the oil discharge valve respectively through the oil suction valve and the oil discharge valve. The oil discharge port is connected, the plunger performs linear reciprocating motion in the plunger cavity and the end part conflicts with the side of the polygonal transmission member, and the return spring is sleeved outside the plunger.

Preferably, the return spring is located between the cylinder body and the polygonal transmission member.

Preferably, the side of the polygonal transmission member is provided with a groove for matching with the plunger, and the plug body of the plunger is provided with an oil chamber channel along the axial direction.

Preferably, the oil suction valve and the oil discharge valve are one-way valves.

Preferably, the polygonal transmission member is a regular polygon.

Preferably, the polygonal transmission member is a regular pentagon or a regular heptagon.

When working, the motor drives the transmission shaft to rotate, and the transmission shaft drives the eccentric sleeve to rotate circumferentially through the key, and the eccentric sleeve indirectly drives the polygonal transmission member to perform eccentric movement through the first bearing. During the eccentric movement, the polygonal transmission member passes through the corresponding side Squeeze the plungers of each group of plunger mechanisms in sequence, driving the plungers to make linear reciprocating motions in the plunger chambers of the cylinder body, and cause changes in the volume of the plunger chambers: when the plungers are squeezed and move outward During the movement, the oil discharge valve opens, the oil suction valve automatically closes, and the oil in the plunger chamber is discharged from the oil discharge port to complete the oil discharge action; when the plunger is no longer squeezed and returns under the force of the return spring, the oil is discharged The valve is automatically closed, and the oil suction valve is automatically opened, and the oil is sucked into the plunger cavity from the oil suction port to complete the oil suction action.

Every time the eccentric sleeve rotates once, each group of plunger mechanisms is forced to complete a process of oil suction and oil discharge through the polygonal transmission member.

The contact between the plunger and the polygonal transmission component is a positioning contact, and the plunger directly cooperates with the groove on the multi-variable transmission component to prevent the plunger from sliding on the side of the multi-variable transmission component, replacing the plunger in the prior art along the eccentric wheel. The sliding contact method of the wheel surface directly reduces wear and prolongs the service life of the plunger pump; and the plunger body is provided with an oil chamber channel, and the oil in the plunger cavity can enter the groove and the column through the oil chamber channel. Lubricate the connection of the plug to further reduce the friction loss between the groove and the plunger. Certainly, in order to prevent oil from flowing out from the groove, a sealing member is correspondingly provided at the connection between the groove and the plunger.

Compared with the prior art, the present invention has the following advantages:

1) The side of the polygonal transmission member is in contact with the plunger, and the number of sides of the polygonal transmission member is the same as the number of plunger mechanisms. For example, the regular pentagonal transmission member corresponds to five sets of plunger mechanisms; each plunger mechanism The plunger cooperates with the groove on each side of the polygonal transmission member, which not only facilitates the positioning during assembly, but also prevents the plunger from sliding along the side of the polygonal transmission member, greatly reducing the gap between the plunger and the polygonal transmission member. resulting wear and tear;

2) The return spring is located between the cylinder body and the polygonal transmission member, rather than inside the cylinder body. Due to the large space outside the cylinder body, the deformation of the return spring can be effectively increased, and the return force given by the spring to the plunger can be increased. The variable volume of the plunger cavity is increased, and the self-priming performance is greatly optimized without increasing the volume of the pump body;

3) The oil discharge valve and the oil suction valve adopt the one-way valve setting, which has a simple structure and reduces the volume of the pump body itself;

4) The plug body of the plunger is provided with an oil chamber passage, and the oil in the plunger chamber can enter the connection between the groove and the plunger through the oil chamber passage for lubrication, further reducing the friction loss between the groove and the plunger.

Description of drawings

Fig. 1 is the structural representation of multi-cylinder high-pressure radial piston pump in the specific embodiment;

Fig. 2 is a schematic view of the longitudinal section of the multi-cylinder high-pressure radial piston pump in Fig. 1;

Fig. 3 is a cross-sectional schematic diagram of the multi-cylinder high-pressure radial piston pump in Fig. 1;

The figure is marked as: shell 1, upper collector plate 2, lower collector plate 3, oil suction port 4, oil discharge port 5, end cover 6, transmission shaft 7, key 8, eccentric sleeve 9, first bearing 10, Plunger 11, cylinder body 12, second bearing 13, return spring 14, oil discharge valve 15, oil suction valve 16, positive pentagonal transmission mechanism 17, oil chamber channel 18.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1, Figure 2 and Figure 3, a multi-cylinder high-pressure radial piston pump is designed, including a housing 1 and an upper collector plate 2 and a lower collector plate 3 respectively arranged on the upper and lower end surfaces of the housing , the upper collector plate 1 is provided with several oil suction ports 4, the lower collector plate 3 is provided with several oil discharge ports 5, and the upper collector plate 2 and the lower collector plate 3 are provided with a second bearing 13 for supporting the transmission shaft 7 , the collector plate corresponding to the second bearing 13 is provided with an end cover 6, the center of the housing 1 is provided with a transmission shaft 7, the transmission shaft 7 is connected with the eccentric sleeve 9 through a key 8, and the eccentric sleeve 9 is provided with a first bearing 10. The first bearing 10 is located at the center of the regular pentagonal transmission member 17, and 5 sets of plunger mechanisms are distributed at equal intervals in the circumferential direction around the regular pentagonal transmission member 17. The plunger mechanisms include a plunger 11 and a cylinder 12, The cylinder body 12 is provided with a plunger chamber, the plunger chamber communicates with the oil suction port 4 and the oil discharge port 5 respectively through the oil suction valve 16 and the oil discharge valve 15, and the plunger 11 performs linear reciprocating motion in the plunger chamber and the end is connected with the The groove on the side of the regular pentagonal transmission member 17 fits in, the plug body of the plunger is provided with an oil chamber channel 18 along the axial direction, and the plunger outside between the cylinder body 12 and the regular pentagonal transmission member 17 is sleeved with Return spring 14. The oil suction valve and the oil discharge valve are one-way valves.

When working, the motor drives the transmission shaft 7 to rotate, and the transmission shaft 7 drives the eccentric sleeve 9 to rotate circumferentially through the key 8, and the eccentric sleeve 9 indirectly drives the regular pentagonal transmission member 17 to perform eccentric movement through the first bearing 10, and the regular pentagonal transmission During the eccentric movement of the member 17, the corresponding side surfaces sequentially squeeze the plunger 11 of each group of plunger mechanisms, driving the plunger 11 to make a linear reciprocating motion in the plunger cavity of the cylinder body 12, and causing the plunger cavity to Changes in the internal volume: when the plunger 11 is squeezed and moves outward, the oil discharge valve 15 opens, the oil suction valve 16 automatically closes, and the oil in the plunger chamber is discharged from the oil discharge port 5 to complete the oil discharge action; when the plunger When the plug 11 is no longer squeezed and returns under the force of the return spring 14, the oil discharge valve 15 is automatically closed, and the oil suction valve 16 is automatically opened, and the oil is sucked into the plunger chamber from the oil suction port 4 to complete the oil suction action.

Every time the eccentric sleeve 9 rotates once, the regular pentagonal transmission member 17 drives each group of plunger mechanisms to complete the process of oil absorption and oil discharge.

The contact between the plunger 11 and the regular pentagonal transmission member 17 is positioning contact, and the plunger 11 directly cooperates with the groove on the regular pentagonal transmission member 17 to prevent the plunger 11 from being on the side of the regular pentagonal transmission member 17. Sliding, replacing the contact mode in which the plunger slides along the eccentric wheel surface in the prior art, directly reduces wear and prolongs the service life of the plunger pump; and the plug body of the plunger 11 is provided with an oil chamber passage 18, and the plunger The oil in the cavity can enter the joint between the groove and the plunger 11 through the oil chamber channel 18 for lubrication, further reducing the friction loss between the groove and the plunger 11 . Certainly, in order to prevent oil from flowing out from the groove, a sealing member is correspondingly provided at the connection between the groove and the plunger 11 .

Claims (10)

1. A multi-cylinder high-pressure radial plunger pump, comprising a housing and an upper collector plate and a lower collector plate respectively arranged on the upper and lower end surfaces of the housing, the upper collector plate is provided with several oil suction ports, and the lower collector plate The plate is provided with several oil outlets, and its characteristic is that an eccentric device and multiple sets of plunger mechanisms distributed circumferentially around the eccentric device are arranged at the center of the housing; The outer sleeve is provided with a first bearing, the first bearing is located at the center of the polygonal transmission component, the side of the polygonal transmission component is in contact with the plunger mechanism, and the plunger mechanism communicates with the oil suction port and the oil discharge port respectively. 2. The multi-cylinder high-pressure radial piston pump according to claim 1, wherein the number of sides of the polygonal transmission member is the same as the number of the plunger mechanism. 3. The multi-cylinder high-pressure radial piston pump according to claim 1, characterized in that, the upper collector plate and the lower collector plate are provided with a second bearing for supporting the drive shaft, and the second bearing corresponds to An end cover is provided on the collector plate. 4. The multi-cylinder high-pressure radial piston pump according to claim 1, wherein the transmission shaft is keyed to the eccentric sleeve. 5. The multi-cylinder high-pressure radial plunger pump according to claim 1, wherein the plunger mechanism comprises a plunger, a cylinder body, an oil suction valve, an oil discharge valve and a return spring, and the cylinder body is provided with The plunger cavity is connected to the oil suction port and the oil discharge port respectively through the oil suction valve and the oil discharge valve. The plunger makes a linear reciprocating motion in the plunger cavity and the end conflicts with the side of the polygonal transmission component. The return spring sleeve located on the outside of the plunger. 6. The multi-cylinder high-pressure radial piston pump according to claim 5, wherein the return spring is located between the cylinder body and the polygonal transmission member. 7. The multi-cylinder high-pressure radial piston pump according to claim 5, characterized in that, the side of the polygonal transmission member is provided with a groove for matching with the plunger, and the plug body of the plunger is along the axial direction. Equipped with an oil chamber channel. 8. The multi-cylinder high-pressure radial piston pump according to claim 5, wherein the oil suction valve and the oil discharge valve are one-way valves. 9. The multi-cylinder high-pressure radial piston pump according to any one of claims 1-8, wherein the polygonal transmission member is a regular polygon. 10. The multi-cylinder high-pressure radial piston pump according to claim 9, wherein the polygonal transmission member is a regular pentagon or a regular heptagon.