CN111779673B

CN111779673B - Coaxial internal gear pump of motor

Info

Publication number: CN111779673B
Application number: CN202010635344.5A
Authority: CN
Inventors: 王新彪; 沈树洪; 张紫华
Original assignee: Zhejiang Kester Power Technology Co ltd
Current assignee: Zhejiang Kester Power Technology Co ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-12-10
Anticipated expiration: 2040-07-03
Also published as: CN111779673A

Abstract

The invention provides a motor coaxial internal gear pump which comprises a motor, a shell assembly, a working oil cavity arranged in the shell assembly, a gear ring arranged in the working oil cavity, and a gear meshed with the gear ring, wherein the gear is arranged on a gear shaft, the gear shaft is connected with the motor, an oil suction side and an oil outlet side are respectively formed on two sides of the meshing part of the gear and the gear ring, a shaft hole is arranged in the shell assembly, a bearing is arranged in the shaft hole, the gear shaft is connected in the bearing, a bottom oil cavity is arranged on one side of the shaft hole, a baffle plate is arranged in the working oil cavity and is positioned at one end of the gear, an oil return hole and a through hole through which the bearing can pass are arranged on the baffle plate, a tooth root oil suction groove is arranged on one side of the through hole, and a tooth root oil suction groove is positioned on the oil suction side. The invention can push the hydraulic oil in the bottom oil cavity to circularly flow, thereby bringing out the heat generated by the bearing, playing a role in cooling the bearing, avoiding the overheating of the bearing and prolonging the service life of the bearing.

Description

Coaxial internal gear pump of motor

Technical Field

The invention relates to the technical field of pumps, in particular to a motor coaxial internal gear pump.

Background

Internal gear pumps are well known. The traditional internal gear pump is shown in figure 9 and comprises a shell assembly consisting of a shell body and an end cover, wherein a working oil cavity is arranged in the shell body, a gear ring and a gear eccentrically meshed with the gear ring are arranged in the working oil cavity, the gear is arranged on a gear shaft, a shaft hole is arranged in the shell assembly, a bearing is arranged in the shaft hole, the gear shaft is arranged on the bearing, and a bottom oil cavity is arranged on one side of the shaft hole. Traditional crescent gear pump is in the course of the work, hydraulic oil in the working oil intracavity can permeate the bottom oil pocket through the clearance between bearing and the gear shaft or the clearance between bearing and the shaft hole, because the bottom oil pocket is comparatively sealed, the hydraulic oil that flows to the bottom oil intracavity can't form the circulation flow, lead to hydraulic oil can the siltation in the bottom oil pocket, consequently, the heat that the circulation flow that can't pass through hydraulic oil produced the bearing is taken away out, make bearing position part temperature can obviously rise, make the bearing overheated, influence the life of bearing.

Disclosure of Invention

The invention aims to solve the problems that hydraulic oil is easy to accumulate in an oil cavity at the bottom and heat generated at a bearing position cannot be brought out through the circulating flow of the hydraulic oil in the conventional internal gear pump in the using process, so that the bearing is overheated and the service life of the bearing is influenced.

The utility model aims at realizing through the following technical scheme: the utility model provides a coaxial crescent gear pump of motor which characterized in that: the gear shaft is connected in the bearing, one side of the shaft hole is provided with a bottom oil cavity, a baffle is arranged in the working oil cavity and is positioned at one end of the gear, the baffle is provided with an oil return hole and a through hole through which the bearing can pass, one side of the through hole is provided with a tooth root oil suction groove, and the tooth root oil suction groove is positioned at the oil suction side; a shaft hole is formed in the gear shaft, and an output shaft of the motor is connected to the shaft hole of the gear shaft.

According to the invention, hydraulic oil in the working oil cavity can flow into the bottom oil cavity through the oil return hole and along a gap between the bearing and the gear shaft or a gap between the bearing and the shaft hole, and meanwhile, as the tooth root oil suction groove is positioned at the oil suction side, the hydraulic oil in the bottom oil cavity can be sucked back into the working oil cavity along the gap between the bearing and the gear shaft or the gap between the bearing and the shaft hole under the suction effect of the oil suction side, so that the hydraulic oil flowing into the bottom oil cavity can circularly flow, the hydraulic oil is prevented from being deposited in the bottom oil cavity, and the hydraulic oil can enter the surface of the bearing in the circulating flow process, so that heat generated by the bearing is taken out, the bearing is cooled, the bearing is prevented from being overheated, and the service life of the bearing is prolonged. According to the invention, the gear shaft is connected with the output shaft of the motor in a shaft hole connection mode, the shaft hole is formed in the gear shaft, the output shaft of the motor is directly connected in the shaft hole, and the output shaft of the motor is connected with the shaft hole through the spline, so that the gear shaft and the motor shaft are not required to be connected through parts such as a coupler and the like, the structure of the gear pump is simplified, the assembly of the gear pump is facilitated, the connection is reliable, the synchronism during transmission is high, and the transmission efficiency is improved; in addition, because the gear shaft and the motor output shaft are connected through the shaft hole, coaxial transmission is realized, namely, one shaft is used for driving, devices such as a coupler and the like are not needed, the problem that the coupler occupies a larger internal space is solved, and the whole gear pump is more compact in structure.

Preferably, a spacer is arranged between the gear ring and the gear, the spacer is located on the oil outlet side, the spacer comprises a first spacer block and a second spacer block, an elastic element is arranged between the first spacer block and the second spacer block, one side surface of the first spacer block is in contact with the outer surface of the gear, and one side surface of the second spacer block is in contact with the inner surface of the gear ring. The traditional isolating piece is an integral part, and because the surfaces of the gear and the gear ring, which are contacted with the isolating piece, are abraded in the long-term rotating process of the gear and the gear ring, the gap between the isolating piece and the gear ring is increased, and the separating effect is seriously reduced. In the invention, the isolation piece consists of the first spacing block and the second spacing block, the elastic piece is arranged between the first spacing block and the second spacing block, and the elastic piece props the first spacing block and the second spacing block to two sides, so that the first spacing block and the second spacing block can be tightly attached to the surface of the gear and the surface of the gear ring, and the isolation effect is improved.

Preferably, the elastic member is a wave spring strip.

Preferably, the shell assembly is provided with an oil inlet and an oil outlet, the oil inlet is communicated with the oil suction side, and the oil outlet is communicated with the oil outlet side. And external hydraulic oil enters the oil suction side through the oil inlet and is then discharged from the oil outlet.

Preferably, the housing assembly comprises a housing body and an end cover, and the housing body is connected with the end cover through a first bolt.

Preferably, a heat dissipation channel is arranged on the side face of the shell assembly, a sliding groove is formed in one side of the heat dissipation channel, a piston is arranged in the sliding groove, an air cavity is formed between the piston and one end of the sliding groove, and a spring is arranged between the piston and the other end of the sliding groove; the piston is provided with a second magnet, and the gear ring is provided with a first magnet corresponding to the second magnet; an air suction channel and an air blowing channel are further arranged between the air cavity and the heat dissipation channel, a first one-way valve is arranged in the air suction channel, and a second one-way valve is arranged in the air blowing channel. Crescent gear pump can produce great heat at the operation in-process for the casing generates heat, need dispel the heat to the casing. The side face of the shell assembly is provided with the heat dissipation channel, the heat dissipation channel can increase the heat dissipation area of the shell, and the heat dissipation effect of the shell can be improved. The piston can slide along the sliding groove, when the gear ring rotates, a first magnet arranged on the gear ring can pass through a second magnet at a certain frequency, when the gear ring passes through the second magnet every time, the first magnet is firstly close to the second magnet, when the distance between the first magnet and the second magnet is nearest, the first magnet starts to be away from the second magnet, when the first magnet is close to the second magnet, the second magnet and the first magnet attract each other, the second magnet enables the second magnet to move towards the direction of the first magnet under the action of the magnetic force of the first magnet, when the first magnet is away from the second magnet, the magnetic force of the first magnet on the second magnet is gradually weakened, the second magnet moves towards the direction away from the first magnet under the action of a spring until the second magnet moves to the initial position, the second magnet drives the piston to move synchronously in the moving process, when the first magnet passes through the second magnet every time, the piston all accomplishes a reciprocating motion, and a reciprocating motion is accomplished to the piston, all breathes in once and blows, and when breathing in, gas is from breathing in the passageway and is inhaled the air cavity, and when blowing, the gas in the air cavity outwards blows out and blows in the heat dissipation channel through the passageway of blowing to form the air current in the heat dissipation channel, discharge the heat in the heat dissipation channel, thereby improve the radiating efficiency.

Preferably, the first check valve comprises a first valve body, a first taper hole is formed in the first valve body, a first valve ball is arranged on the first taper hole, a first elastic pressing piece is further arranged on the first valve body, and one end of the first elastic pressing piece abuts against one side of the valve ball.

Preferably, the second check valve comprises a second valve body, a second taper hole is formed in the second valve body, a second valve ball is arranged on the second taper hole, a second elastic pressing piece is further arranged on the second valve body, and one end of the second elastic pressing piece abuts against one side of the valve ball.

Preferably, the included angle between the air blowing channel and the heat dissipation channel is 15-30 degrees. The air blowing channel and the heat dissipation channel form a certain included angle, air blown out from the air blowing channel is blown into the heat dissipation channel at a certain angle, and the blown air can effectively push air in the heat dissipation channel to flow, so that the heat dissipation effect is provided.

Preferably, the ring gear is provided with a plurality of oil holes.

The invention has the beneficial effects that: the invention can push the hydraulic oil in the bottom oil cavity to circularly flow, thereby bringing out the heat generated by the bearing, playing a role in cooling the bearing, avoiding the overheating of the bearing and prolonging the service life of the bearing.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a cross-sectional view of the pump body.

FIG. 3 is a schematic view of the pump body with the end cap removed.

FIG. 4 is a schematic view of the pump body with the end caps and the baffle removed.

Fig. 5 is a schematic view of the structure of the ring gear.

Fig. 6 is a schematic structural view of a spacer in embodiment 1.

Fig. 7 is an enlarged view of a portion a in fig. 2.

Fig. 8 is an enlarged view of a portion B in fig. 7.

Fig. 9 is an enlarged view of the portion C in fig. 7.

Fig. 10 is a sectional view of a conventional gear pump.

Fig. 11 is a schematic structural view of a spacer in embodiment 2.

Fig. 12 is a side view of an elastic sheet.

In the figure: 1. the motor, 2, the shell body, 3, the end cover, 4, the first bolt, 5, the oil outlet, 6, the oil inlet, 7, the flange plate, 8, the second bolt, 9, the gear, 10, the baffle, 11, the bearing, 12, the bottom oil chamber, 13, the gear ring, 14, the heat dissipation channel, 15, the tooth root oil suction groove, 16, the oil return hole, 17, the oil suction side, 18, the oil outlet side, 19, the limit column, 20, the first spacer block, 21, the second spacer block, 22, the oil hole, 23, the elastic member, 24, the first magnet, 25, the sliding groove, 26, the retainer ring, 27, the piston, 28, the second magnet, 29, the spring, 30, the air chamber, 31, the air suction channel, 32, the air blowing channel, 33, the first valve body, 34, the first taper hole, 35, the first valve ball, 36, the first elastic pressing sheet, 37, the second valve body, 38, the valve hole, 39, the second valve ball, 40, the second elastic pressing sheet, 41, the installation groove, 42. abutting columns 43 and elastic pieces.

Detailed Description

The invention is further described by the following detailed description in conjunction with the accompanying drawings.

Example 1:

as shown in fig. 1 to 10, a motor coaxial internal gear pump comprises a motor 1 and a pump body, wherein a flange plate 7 is arranged on the motor 1. The pump body includes a housing assembly including a housing body 2 and an end cap 3. The end cap 3 is attached to the housing body 2 by a first bolt 4. The housing body 2 is attached to the flange plate 7 by second bolts 8. A working oil cavity is arranged in the shell assembly and is a cylindrical cavity. A rotatable gear ring 13 is arranged in the working oil chamber, and a plurality of oil holes 22 are formed in the gear ring 13. The oil holes 22 are distributed in the circumferential direction of the ring gear 13. The ring gear 13 is provided with a gear 9, and the gear 9 is engaged with one side of the ring gear 13. The gear 9 is arranged on a gear shaft. A shaft hole is arranged in the gear shaft, and an output shaft of the motor 1 is connected in the shaft hole of the gear shaft. According to the invention, the gear shaft is connected with the output shaft of the motor in a shaft hole connection mode, the shaft hole is formed in the gear shaft, the output shaft of the motor is directly connected in the shaft hole, and the output shaft of the motor is connected with the shaft hole through the spline, so that the gear shaft and the motor shaft are not required to be connected through parts such as a coupler and the like, the structure of the gear pump is simplified, the assembly of the gear pump is facilitated, the connection is reliable, the synchronism during transmission is high, and the transmission efficiency is improved; in addition, because the gear shaft and the motor output shaft are connected through the shaft hole, coaxial transmission is realized, namely, one shaft is used for driving, devices such as a coupler and the like are not needed, the problem that the coupler occupies a larger internal space is solved, and the whole gear pump is more compact in structure. Shaft holes are arranged at two ends of the working oil cavity, and bearings 11 are arranged in the shaft holes. The gear shaft is connected to the bearing 11. One side of one of the shaft holes is provided with a bottom oil chamber 12. The two sides of the meshing of the gear 9 with the ring gear 13 form an oil suction side 17 and an oil outlet side 18, respectively. The shell body 2 is provided with an oil outlet 5 and an oil inlet 6, the oil outlet 5 is communicated with an oil outlet side 18, and the oil inlet 6 is communicated with an oil suction side 17. A baffle plate 10 is arranged in the working oil cavity. A baffle 10 is provided at one end of the gear 9 adjacent the bottom oil chamber 12. The shutter 10 is in contact with the end face of the gear 9. The baffle 10 is provided with an oil return hole 16 and a through hole which can enable the bearing 11 to pass through, and one side of the through hole is provided with a tooth root oil suction groove 15. The root suction groove 15 is located on the suction side 17.

A spacer is provided between the ring gear 13 and the gear wheel 9. The partition is arranged on the oil outlet side 18. A limiting column 19 for limiting one end of the isolating piece is arranged in the working oil cavity. The isolating piece comprises a first isolating block 20 and a second isolating block 21, an elastic piece 23 is arranged between the first isolating block 20 and the second isolating block 21, one side surface of the first isolating block 20 is in contact with the outer surface of the gear 9, and one side surface of the second isolating block 21 is in contact with the inner surface of the gear ring 13. In this embodiment, the elastic member 23 is a wave spring strip. The traditional isolating piece is an integral part, and because the surfaces of the gear and the gear ring, which are contacted with the isolating piece, are abraded in the long-term rotating process of the gear and the gear ring, the gap between the isolating piece and the gear ring is increased, and the separating effect is seriously reduced. In the invention, the isolation piece consists of the first spacing block and the second spacing block, the elastic piece is arranged between the first spacing block and the second spacing block, and the elastic piece props the first spacing block and the second spacing block to two sides, so that the first spacing block and the second spacing block can be tightly attached to the surface of the gear and the surface of the gear ring, and the isolation effect is improved.

The side of the housing body 2 is provided with a heat dissipation channel 14, one side of the heat dissipation channel 14 is provided with a sliding groove 25, one end of the sliding groove 25 close to the heat dissipation channel 14 is closed, and the other end is opened. A piston 27 is provided in the slide groove 25, and the piston 27 is slidable in the axial direction of the slide groove 25. An air chamber 30 is formed between the piston 27 and the closed end of the slide groove 25. A retainer 26 is provided at the open end of the slide groove 25, and a spring 29 is provided between the retainer 26 and the piston 27. An air suction channel 31 and an air blowing channel 32 are also arranged between the air cavity 30 and the heat dissipation channel 14, a first one-way valve is arranged in the air suction channel 31, and a second one-way valve is arranged in the air blowing channel 32. The included angle between the air blowing channel 32 and the heat dissipation channel 14 is 15-30 degrees. The piston 27 is provided with a second magnet 28, and the outside of the ring gear 13 is provided with a first magnet 24 corresponding to the second magnet 28. The first one-way valve comprises a first valve body 33, a first taper hole 34 is formed in the first valve body 33, and the diameter of one side, close to the air cavity 30, of the first taper hole 34 is larger than that of the other side of the first taper hole 34. The first taper hole 34 is provided with a first valve ball 35, the first valve body 33 is further provided with a first elastic pressing piece 36, and one end of the first elastic pressing piece 36 abuts against one side of the first valve ball 35. The second one-way valve comprises a second valve body 37, a second taper hole 38 is arranged on the second valve body 37, and the diameter of one side of the second taper hole 38 close to the air cavity 30 is smaller than the diameter of the other side of the second taper hole 38. The second conical hole 38 is provided with a second valve ball 39, the second valve body 37 is further provided with a second elastic pressing sheet 40, and one end of the second elastic pressing sheet 10 abuts against one side of the second valve ball 39. Crescent gear pump can produce great heat at the operation in-process for the casing generates heat, need dispel the heat to the casing. The side face of the shell assembly is provided with the heat dissipation channel, the heat dissipation channel can increase the heat dissipation area of the shell, and the heat dissipation effect of the shell can be improved. The piston can slide along the sliding groove, when the gear ring rotates, a first magnet arranged on the gear ring can pass through a second magnet at a certain frequency, when the gear ring passes through the second magnet every time, the first magnet is firstly close to the second magnet, when the distance between the first magnet and the second magnet is nearest, the first magnet starts to be away from the second magnet, when the first magnet is close to the second magnet, the second magnet and the first magnet attract each other, the second magnet enables the second magnet to move towards the direction of the first magnet under the action of the magnetic force of the first magnet, when the first magnet is away from the second magnet, the magnetic force of the first magnet on the second magnet is gradually weakened, the second magnet moves towards the direction away from the first magnet under the action of a spring until the second magnet moves to the initial position, the second magnet drives the piston to move synchronously in the moving process, when the first magnet passes through the second magnet every time, the piston all accomplishes a reciprocating motion, and a reciprocating motion is accomplished to the piston, all breathes in once and blows, and when breathing in, gas is from breathing in the passageway and is inhaled the air cavity, and when blowing, the gas in the air cavity outwards blows out and blows in the heat dissipation channel through the passageway of blowing to form the air current in the heat dissipation channel, discharge the heat in the heat dissipation channel, thereby improve the radiating efficiency.

According to the invention, hydraulic oil in the working oil cavity can flow into the bottom oil cavity through the oil return hole and along a gap between the bearing and the gear shaft or a gap between the bearing and the shaft hole, and meanwhile, as the tooth root oil suction groove is positioned at the oil suction side, the hydraulic oil in the bottom oil cavity can be sucked back into the working oil cavity along the gap between the bearing and the gear shaft or the gap between the bearing and the shaft hole under the suction effect of the oil suction side, so that the hydraulic oil flowing into the bottom oil cavity can circularly flow, the hydraulic oil is prevented from being deposited in the bottom oil cavity, and the hydraulic oil can enter the surface of the bearing in the circulating flow process, so that heat generated by the bearing is taken out, the bearing is cooled, the bearing is prevented from being overheated, and the service life of the bearing is prolonged.

Example 2:

as shown in fig. 11 and 12, embodiment 2 differs from embodiment 1 in that: in embodiment 2, the spacer includes first spacer 20 and second spacer 21, and one side that is close to second spacer 21 on first spacer 20 is provided with a plurality of arrangement groove 41, is provided with flexure strip 43 and butt post 42 in the arrangement groove 41, and butt post one side is supported against with second spacer 21, and the opposite side supports against with flexure strip 43, and flexure strip 43 is the wave. The rest of the structure was the same as in example 1.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a coaxial crescent gear pump of motor which characterized in that: including the motor, the shell assembly, set up the working oil chamber in the shell assembly, set up the ring gear in the working oil chamber, with ring gear meshing's gear, the gear setting is on the gear shaft, the gear shaft links to each other with the motor, the gear forms respectively with the both sides of ring gear meshing department and inhales oil side and produce oil side, is provided with the shaft hole in the shell assembly, is provided with the bearing in the shaft hole, the gear shaft is connected in the bearing, one side in shaft hole is provided with bottom oil chamber, its characterized in that: a baffle is arranged in the working oil cavity, the baffle is positioned at one end of the gear, an oil return hole and a through hole which can enable the bearing to pass through are arranged on the baffle, a tooth root oil suction groove is arranged at one side of the through hole, and the tooth root oil suction groove is positioned at the oil suction side; the gear shaft is provided with a shaft hole, and an output shaft of the motor is connected in the shaft hole of the gear shaft; an isolating piece is arranged between the gear ring and the gear and is positioned on the oil outlet side, the isolating piece comprises a first isolating block and a second isolating block, an elastic piece is arranged between the first isolating block and the second isolating block, one side surface of the first isolating block is in contact with the outer surface of the gear, and one side surface of the second isolating block is in contact with the inner surface of the gear ring; a heat dissipation channel is arranged on the side face of the shell assembly, a sliding groove is formed in one side of the heat dissipation channel, a piston is arranged in the sliding groove, an air cavity is formed between the piston and one end of the sliding groove, and a spring is arranged between the piston and the other end of the sliding groove; the piston is provided with a second magnet, and the gear ring is provided with a first magnet corresponding to the second magnet; an air suction channel and an air blowing channel are further arranged between the air cavity and the heat dissipation channel, a first one-way valve is arranged in the air suction channel, and a second one-way valve is arranged in the air blowing channel.

2. An electric machine coaxial crescent gear pump according to claim 1, wherein said resilient member is a wave spring bar.

3. The motor coaxial internal gear pump according to claim 1, wherein the housing assembly is provided with an oil inlet and an oil outlet, the oil inlet is communicated with the oil suction side, and the oil outlet is communicated with the oil outlet side.

4. An electric machine coaxial crescent gear pump according to claim 1, characterized in that the housing assembly comprises a housing body and an end cover, the housing body and the end cover being connected by a first bolt.

5. The motor coaxial internal gear pump according to claim 1, wherein the first check valve comprises a first valve body, a first taper hole is formed in the first valve body, a first valve ball is arranged in the first taper hole, a first elastic pressing piece is further arranged on the first valve body, and one end of the first elastic pressing piece abuts against one side of the first valve ball.

6. The motor coaxial internal gear pump according to claim 1, wherein the second one-way valve comprises a second valve body, a second taper hole is formed in the second valve body, a second valve ball is arranged on the second taper hole, a second elastic pressing piece is further arranged on the second valve body, and one end of the second elastic pressing piece abuts against one side of the second valve ball.

7. The motor coaxial internal gear pump of claim 1, wherein an included angle between the air blowing channel and the heat dissipation channel is 15-30 degrees.

8. An electric machine coaxial internal gear pump according to claim 1, wherein the ring gear is provided with a plurality of oil holes.