CN116163948A - Double-rotation-direction internal gear pump - Google Patents

Double-rotation-direction internal gear pump Download PDF

Info

Publication number
CN116163948A
CN116163948A CN202211661307.7A CN202211661307A CN116163948A CN 116163948 A CN116163948 A CN 116163948A CN 202211661307 A CN202211661307 A CN 202211661307A CN 116163948 A CN116163948 A CN 116163948A
Authority
CN
China
Prior art keywords
oil
gear
distribution disc
pump
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211661307.7A
Other languages
Chinese (zh)
Inventor
吴国伟
张振廷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Weifu Jinning Co ltd
Original Assignee
Nanjing Weifu Jinning Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing Weifu Jinning Co ltd filed Critical Nanjing Weifu Jinning Co ltd
Priority to CN202211661307.7A priority Critical patent/CN116163948A/en
Publication of CN116163948A publication Critical patent/CN116163948A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Abstract

The invention discloses a double-rotation-direction internal gear pump, which comprises a pump body and a pump cover which are oppositely arranged, wherein a working cavity is arranged in the pump body, a gear ring and a radial clearance compensation structure are arranged in the working cavity, the gear is arranged on the gear, the gear ring is arranged outside the gear in a matching way, one side of the gear is meshed with the gear ring, and the radial clearance compensation structure is arranged in a gap between the other side of the gear and the gear ring; the oil inlet and outlet are axial oil inlet and outlet arranged on the pump cover. The double-rotation inward-meshing gear pump adopts an axial oil inlet and outlet design, so that radial leakage points of the gear ring can be reduced, the volumetric efficiency of the oil pump is improved, the processing and manufacturing cost of radial holes of the gear ring is reduced, the double-rotation inward-meshing gear pump is matched with a servo motor to be used for a closed hydraulic system, the reciprocating motion of an oil cylinder is changed from valve control to pump control, the hydraulic system is simplified, and the energy consumption is reduced.

Description

Double-rotation-direction internal gear pump
Technical Field
The invention relates to the technical field of gear pumps, in particular to a double-rotation-direction internal gear pump.
Background
The internal gear pump has the characteristics of low noise, low flow pulsation, high efficiency and the like, can further improve the efficiency through axial and radial clearance compensation design, can obtain good low-speed performance, and is widely applied to the field of servo hydraulic pressure at present. The internal gear pump reduces the leakage quantity of radial clearance through radial clearance compensation design, improves volumetric efficiency, and improves low-speed performance. The radial clearance compensation structure consists of an oil distribution disc frame, an oil distribution disc, a sealing roller, a spring piece and a stop pin.
At present, the single-rotation internal gear pump structure is characterized in that an oil inlet and an oil outlet are fixed, the rotation direction of an oil pump can only be the only rotation direction, oil is absorbed from the oil inlet and enters a pump cavity during positive rotation, the oil outlet discharges oil, and high-pressure hydraulic oil is supplied to a hydraulic system. When the oil pump reverses, hydraulic oil can only be sucked from the original oil outlet and discharged from the original oil inlet at low pressure, and at the moment, the function that the oil outlet pressure of the oil port is high cannot be realized.
In addition, the oil inlet and outlet on the existing internal gear pump adopts radial design, and the gear ring is required to be provided with an oil drain hole between each tooth for oil inlet and outlet. The pump body is required to be designed with an oil inlet groove and an oil outlet groove, and the support of the pump body to the gear ring is not 360 degrees due to the design relationship of the oil inlet groove, so that the bearing capacity is poor. And the radial clearance between the gear ring and the pump body can have leakage of high-pressure oil, and the volumetric efficiency is reduced.
Disclosure of Invention
Aiming at the technical problems, the invention provides the double-rotation-direction internal gear pump, which can reduce radial leakage points of a gear ring, improve the volumetric efficiency of an oil pump, reduce the processing and manufacturing cost of radial holes of the gear ring, and is matched with a servo motor for a closed hydraulic system, so that the reciprocating motion of an oil cylinder is changed from valve control to pump control, the hydraulic system is simplified, and the energy consumption is reduced.
In order to achieve the technical purpose, the invention adopts the following technical means:
the double-rotation-direction internal gear pump comprises a pump body and a pump cover which are oppositely arranged, wherein a working cavity is arranged in the pump body, a gear ring and a radial clearance compensation structure are arranged in the working cavity, the gear is arranged on the gear, the gear ring is arranged outside the gear in a matched manner, one side of the gear is meshed with the gear ring, and the radial clearance compensation structure is arranged in a gap between the other side of the gear and the gear ring;
the oil inlet and the oil outlet are axial oil inlet and oil outlet arranged on the pump cover, and a sliding bearing design is added in a middle hole of the pump body;
the pump cover is provided with a first oil duct and a second oil duct which are symmetrically arranged on the left and right;
the gear rotates clockwise, a first volume cavity positioned at one side between the gear ring and the gear is enlarged along with the rotation volume cavity of the gear, and is an oil suction cavity, and hydraulic oil is sucked into the first volume cavity through a first oil duct and a first connecting hole on a first axial plate in sequence; as the gear rotates clockwise, hydraulic oil is pumped into a second volume cavity positioned at the other side between the gear and the gear by a third volume cavity and a fourth volume cavity between the gear and the gear respectively, the volume of the second volume cavity is reduced because the gear and the gear are meshed, high pressure is generated, and the hydraulic oil is discharged through a second connecting hole of the first axial plate and a second oil duct in sequence;
when the rotation direction is changed from clockwise to anticlockwise, the oil inlet and the oil outlet are exchanged, and the high-pressure cavity and the low-pressure cavity are exchanged.
The radial gap compensation structure includes:
the oil distribution disc frame is arranged in the working cavity and is positioned at the right middle position in the gap between the gear and the gear ring;
a first oil distribution disc arranged at one side between the oil distribution disc frame and the gear ring,
the second oil distribution disc is arranged at the other side between the oil distribution disc frame and the gear ring;
the first oil distribution disc and the second oil distribution disc are arranged in a left-right mirror image mode on the central axis of the working cavity;
the first spring piece is arranged between the first oil distribution disc and the oil distribution disc frame;
the second spring piece is arranged between the second oil distribution disc and the oil distribution disc frame;
the first sealing rod is arranged between the first oil distribution disc and the oil distribution disc frame and used for sealing the first oil distribution disc from the oil distribution disc frame and isolating the high-low pressure cavity;
the second sealing rod is arranged between the second oil distribution disc and the oil distribution disc frame and used for sealing the second oil distribution disc from the oil distribution disc frame and isolating the high-low pressure cavity;
the third spring piece is arranged between the first sealing rod and the oil distribution disc frame;
a fourth spring piece arranged between the second sealing rod and the oil distribution disc frame;
a limiting mechanism for preventing the oil distribution disc from moving along with the rotation of the gear ring is arranged between the oil distribution disc frame and the oil distribution disc.
The bottom ends of two sides of the oil distribution disc frame are provided with outwardly extending baffle feet, and the baffle feet form the limiting mechanism.
The pump cover is provided with an oil drain port for conveying hydraulic oil leaked from the high-pressure area back to the oil tank;
the pump cover and the pump body are provided with an oil discharge channel communicated with the oil drain port, and the oil discharge channel comprises:
the fifth volume cavity is defined by the plane of the back part of the stop pin and the mounting hole of the pump cover; one end of the fifth volume cavity is communicated with the oil drain port, and the other end of the fifth volume cavity is communicated with the third volume cavity and the fourth volume cavity through the notch of the first axial plate;
the third volume cavity and the fourth volume cavity are communicated with an oil hole on the pump body through a notch of the second axial plate, and the oil hole is communicated with a sealing cavity of the framework oil seal; the oil drain port is directly connected with the oil tank through an oil pipe, and the back pressure of the oil drain port is kept to be low.
The notch of the first axial plate includes: a first gap and a second gap, wherein the first gap is in communication with the third volume chamber;
the second notch is communicated with the fourth volume cavity;
the notch of the second axial plate includes: the third notch is communicated with the oil hole, and the fourth notch is communicated with the oil hole through a sinking groove on the pump body.
The first oil duct comprises a first oil port and a second oil port which are communicated with each other, wherein the second oil port is communicated with the first connecting hole;
the second oil duct comprises a third oil port and a fourth oil port which are communicated with each other, wherein the fourth oil port is communicated with the second connecting hole.
The pump body and the gear ring are provided with sliding bearings on the matching surfaces, and oil grooves for oil drainage are formed in the inner walls of the sliding bearings adjacent to the gear ring;
the notch on the first axial plate is communicated with a first annular space between the first axial plate and the sliding bearing, and the notch on the second axial plate is communicated with a second annular space between the second axial plate and the sliding bearing; the first annular space is communicated with the second annular space through an oil groove on the sliding bearing.
The beneficial effects are that:
according to the double-rotation-direction internal gear pump, an axial oil inlet and outlet design is adopted, an original radial oil inlet and outlet are changed into an axial oil inlet and outlet, radial leakage points of a gear ring are reduced, the volumetric efficiency of the oil pump is improved, and the machining and manufacturing cost of radial holes of the gear ring is reduced.
The sliding bearing design is added on the matching surface of the pump body and the gear ring, so that the service life of the oil pump and the highest use pressure are improved;
thirdly, radial clearance compensation and axial clearance compensation are designed in a radial symmetry way, so that the bidirectional rotation of the oil pump, the oil inlet and outlet switching function is realized, and high-pressure hydraulic oil to a hydraulic system can be realized clockwise or anticlockwise;
fourthly, an oil drain port design is added, hydraulic oil leaked from the high-pressure area is conveyed back to the oil tank, the pressure of the low-pressure area of the oil pump is ensured, and the oil leakage risk is reduced; meanwhile, oil return reduces the heating value of the oil pump. Meanwhile, because the oil drain port and related oil ways are optimized, the design of the oil drain port is realized by the fifth volume cavity formed by the plane of the back part of the first stop pin and the mounting hole on the pump cover, the space between the gear ring and the two teeth of the gear and the oil groove on the sliding bearing, and the oil drain port has the advantages of low processing difficulty and simple structure.
Drawings
FIG. 1 is a schematic diagram of a pump cover of a dual-spin internal gear pump of the present invention;
wherein 2.1 is a first oil port; 2.4 is a third oil port;
FIG. 2 is a first axial cross-sectional view of the dual-spin internal gear pump of the present invention;
wherein 2.2 is a second oil port; 2.3 is a fourth oil port; 18.1 is a first volume chamber; 18.2 is a second volume chamber; 12.1.1 is a first connecting hole; 12.1.2 is a second connecting hole;
FIG. 3 is a second axial cross-sectional view of the dual-rotary internal gear pump of the present invention;
wherein 1 is a pump body; 2 is a pump cover; 3 is a sliding bearing; 4 is a gear ring; 5 is a gear; 12.1 is a first axial plate, 12.2 a second axial plate; 13.1 is a first plastic pad, 13.2 is a second plastic pad, 13.3 is a third plastic pad, 13.4 is a fourth plastic pad, 14.1 is a first sealing pad, 14.2 is a second sealing pad, 14.3 is a third sealing pad, 14.4 is a fourth sealing pad, 15 is a framework oil seal, 16 is a check ring for holes, and 17 is a small sliding bearing;
FIG. 4 is a radial cross-sectional view of a dual-spin internal gear pump of the present invention;
wherein 3.1 is an oil groove on a sliding bearing, 7.1 is a first spring piece, 7.2 is a second spring piece, 8.1 is a first oil distribution disc, 8.2 is a second oil distribution disc, 9.1 is a third spring piece, 9.2 is a fourth spring piece, 10.1 is a first sealing rod, 10.2 is a second sealing rod, 11.1 is a first stop pin, and 19 is a third volume cavity; 20 is a fourth volume chamber;
FIG. 5 is a schematic diagram of a radial gap compensation structure according to the present invention;
wherein 6 is an oil distribution disc frame;
FIG. 6 is a schematic diagram of the pump body of the present invention;
FIG. 7 is a schematic view of the joint surface between the pump cover and the pump body;
FIG. 8 is an axial cross-sectional view of the oil drain of the present invention;
wherein 1.1 is a skeleton oil seal mounting hole of the pump body, 1.2 is an oil hole of the pump body, 1.3 is a sinking groove on the pump body, 2.5 is a stop pin mounting hole on the pump cover, 2.6 is an oil port, and 2.7 is an oil drain hole;
11.1 is a first stop pin, 11.1.1 is a space between the back of the first stop pin and the mounting hole, and 11.2 is a second stop pin;
12.1 is a first axial plate, 12.1.3 is a circular ring space between the first axial plate and the sliding bearing, 12.1.4 is a slot on the first axial plate, 12.1.5 is a notch on the first axial plate;
12.2.3 is an annular space between the second axial plate and the sliding bearing 3, 12.2.5 is a notch on the second axial plate;
FIG. 9 is a radial cross-sectional view of the drain port of the present invention;
FIG. 10 is a schematic view of the structure of a stop pin of the present invention;
FIG. 11 is a schematic view of the structure of the oil distribution tray frame of the present invention;
FIG. 12 is an overall external view of the double-rotary internal gear pump of the present invention.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the attached drawings and specific embodiments.
The main design scheme of the double-rotation inward-meshing gear pump adopts axial oil inlet and outlet, an oil inlet and outlet port is arranged on a pump cover, and a sliding bearing is additionally arranged in a middle hole of a pump body;
as shown in fig. 1 and 2, a first oil port 2.1, a third oil port 2.4 and a drain port 2.7 are designed on the pump cover;
when the gear in fig. 4 rotates clockwise in operation, the first volume chamber 18.1 enclosed by the gear ring 4 and the gear 5 increases along with the rotation volume of the gear, and is an oil suction chamber, and hydraulic oil is sucked into the first volume chamber 18.1 through the first oil port 2.1, the second oil port 2.2 and the first connecting hole 12.1.1 on the first axial plate 12.1 in sequence. With the clockwise rotation of the gear wheel, hydraulic oil is pumped into the first volume chamber 18.2 by the third volume chamber 19, the fourth volume chamber 20, respectively, between the gear wheel and the ring gear. The first volume chamber 18.2 generates high pressure because the gear ring 4 and the gear 5 are engaged, and the volume is reduced, so that hydraulic oil is sequentially discharged through the second connecting hole 12.1.2, the third oil port 2.3 and the fourth oil port 2.4 of the axial plate 12.1.
When the rotation direction is changed from clockwise to anticlockwise, the oil inlet and the oil outlet are exchanged, and the high-pressure cavity and the low-pressure cavity are exchanged. When rotating anticlockwise: the second volume chamber 18.2 enclosed by the gear ring 4 and the gear 5 is larger along with the rotation engagement and disengagement of the gear, and is an oil suction chamber, and hydraulic oil is sucked into the second volume chamber 18.2 through the fourth oil port 2.4, the third oil port 2.3 and the second connecting hole 12.1.2 on the axial plate 12.1 in sequence. With the clockwise rotation of the gear wheel, hydraulic oil is pumped into the first volume 18.1 by the third volume 19 and the fourth volume 20 between the gear wheel and the ring gear, respectively. The first volume chamber 18.1 generates high pressure because the teeth of the ring gear 4 and the gear 5 are engaged, and the volume between the two engaged teeth becomes small, so that hydraulic oil is sequentially discharged through the first connection hole 12.1.1, the second oil port 2.2 and the first oil port 2.1 of the axial plate 12.1.
When the rotation direction is switched, the oil inlet and the oil outlet are switched, the original oil inlet is changed into the oil outlet, and the original oil outlet is changed into the oil inlet. To achieve this function, the radial clearance compensation and the axial clearance compensation are symmetrically designed radially.
The radial clearance compensation is formed by an oil distribution disc frame 6, a first oil distribution disc 8.1, a second oil distribution disc 8.2, a first spring piece 7.1 and a second spring piece 7.2; the third spring piece 9.1, the fourth spring piece 9.2, the first sealing rod 10.1 and the second sealing rod 10.2; when the first volume cavity 18.1 is a high-pressure cavity, the gap between the first oil distribution disc 8.1 and the oil distribution disc frame 6 is filled with high-pressure oil, the first oil distribution disc 8.1 is pressed against the tooth top circle of the gear ring 4, and the oil distribution disc frame 6 is pressed against the tooth top circle of the gear 5, so that the radial gap sealing effect is achieved. The gap between the first oil distribution disc 8.1 and the oil distribution disc frame 6 is sealed by a first sealing rod 10.1, so as to isolate high-low pressure cavities.
When the first volume chamber 18.1 rotates anticlockwise, the gap between the second oil distribution disc 8.2 and the oil distribution disc frame 6 is filled with high-pressure oil, the second oil distribution disc 8.2 is pressed to the tooth top circle of the gear ring 4, and the oil distribution disc frame 6 is pressed to the tooth top circle of the gear 5, so that the radial gap sealing effect is achieved. The gap between the second oil distribution disc 8.2 and the oil distribution disc frame 6 is sealed by a second sealing rod 10.2, so as to isolate high-low pressure cavities.
In addition, as another preferred embodiment of the invention, an oil drain port design is added, hydraulic oil leaked in a high-pressure area is conveyed back to an oil tank, so that a low-pressure cavity of an oil pump is ensured to be always kept at low pressure, and the leakage risk is reduced; in addition, the oil return at the position can reduce the heating of the oil pump.
As shown in fig. 8, the first stop pin 11.1 back plane and mount Kong Weicheng fifth volume 11.1.1; the fifth volume 11.1.1 is communicated with the oil drain port 2.7 and is communicated with the third volume 19 and the fourth volume 20 between two teeth of the gear through the first notch 12.1.4 and the second notch 12.1.5 of the first axial plate 12.1. The third volume cavity 19 and the fourth volume cavity 20 are communicated with an oil hole 1.2 on the pump body through a third notch 12.2.4 and a fourth notch 12.2.5 of the second axial plate 12.2, and the oil hole 1.2 is communicated with a sealing cavity 1.1 of the framework oil seal; the oil drain port is directly connected with the oil tank through an oil pipe, and the back pressure of the oil drain port is kept to be low. The sealing pressure of the framework oil seal is ensured to be lower, and oil leakage of the framework oil seal is prevented. In addition, when the rotation direction suddenly changes, the pressure of the high-pressure hydraulic oil in the third volume cavity 19 and the fourth volume cavity 20 between two teeth of the gear is not completely released, the pressure is fully released when the gear is communicated with the oil drain port, and the sealing of a low-pressure area is ensured. In addition, if the rotation speed suddenly changes, when the oil absorption is not smooth, and the pressure of the third volume cavity 19 and the fourth volume cavity 20 is lower, when the hydraulic oil is communicated with the oil drain port 2.7, hydraulic oil can be sucked from the oil tank from the oil drain port to be used as a supplement, and the oil drain port is an oil supplement port.
The double-rotation inward-meshing gear pump is applied to a closed hydraulic system, is matched with a servo motor to realize the pump control of the displacement of the oil cylinder, reduces the reversing valve of the hydraulic system, reduces the cost of the hydraulic system, reduces the throttling pressure loss of the valve control, and reduces the energy consumption of the hydraulic system.
The device is applied to specific scenes, such as a high-level forklift, can realize the inversion of the oil pump when cargoes descend from a high level, drives the motor to generate electricity, and realizes energy recovery, energy conservation and emission reduction.
The pump body is additionally provided with a sliding bearing design and an oil drain port design, so that the service life of the product is prolonged.

Claims (7)

1. The double-rotation-direction internal gear pump comprises a pump body and a pump cover which are oppositely arranged, wherein a working cavity is arranged in the pump body, a gear ring and a radial clearance compensation structure are arranged in the working cavity, the gear is arranged on the gear, the gear ring is arranged outside the gear in a matched manner, one side of the gear is meshed with the gear ring, and the radial clearance compensation structure is arranged in a gap between the other side of the gear and the gear ring;
it is characterized in that the method comprises the steps of,
the oil inlet and outlet are axial oil inlet and outlet arranged on the pump cover;
the pump cover is provided with a first oil duct and a second oil duct which are symmetrically arranged on the left and right;
the gear rotates clockwise, a first volume cavity (18.1) positioned at one side between the gear ring and the gear is enlarged along with the rotation of the gear, and is an oil suction cavity, and hydraulic oil is sucked into the first volume cavity (18.1) through a first oil duct and a first connecting hole (12.1.1) on a first axial plate (12.1) in sequence; as the gear rotates clockwise, hydraulic oil is pumped into a second volume cavity (18.2) positioned at the other side between the gear and the gear by a third volume cavity (19) and a fourth volume cavity (20) between the gear and the gear respectively, the second volume cavity (18.2) generates high pressure because the gear and the gear are meshed, and the hydraulic oil is discharged through a second connecting hole (12.1.2) of the first axial plate (12.1) and a second oil duct in sequence;
when the rotation direction is changed from clockwise to anticlockwise, the oil inlet and the oil outlet are exchanged, and the high-pressure cavity and the low-pressure cavity are exchanged.
2. The dual rotary internal gear pump of claim 1, wherein the radial clearance compensation structure comprises:
the oil distribution disc frame (6) is arranged in the working cavity and is positioned at the right middle position in the gap between the gear and the gear ring;
a first oil distribution disc (8.1) arranged at one side between the oil distribution disc frame and the gear ring,
the second oil distribution disc (8.2) is arranged at the other side between the oil distribution disc frame and the gear ring;
the first oil distribution disc and the second oil distribution disc are arranged in a left-right mirror image mode on the central axis of the working cavity;
a first spring piece (7.1) arranged between the first oil distribution disc and the oil distribution disc frame;
a second spring piece (7.2) arranged between the second oil distribution disc and the oil distribution disc frame;
the first sealing rod is arranged between the first oil distribution disc and the oil distribution disc frame and used for sealing the first oil distribution disc from the oil distribution disc frame and isolating the high-low pressure cavity;
the second sealing rod is arranged between the second oil distribution disc and the oil distribution disc frame and used for sealing the second oil distribution disc from the oil distribution disc frame and isolating the high-low pressure cavity;
the third spring piece is arranged between the first sealing rod and the oil distribution disc frame;
a fourth spring piece arranged between the second sealing rod and the oil distribution disc frame;
a limiting mechanism for preventing the oil distribution disc from moving along with the rotation of the gear ring is arranged between the oil distribution disc frame and the oil distribution disc.
3. The double-rotation-direction internal gear pump according to claim 2, wherein the bottom ends of both sides of the oil distribution tray frame are provided with outwardly extending baffle feet, and the baffle feet form the limiting mechanism.
4. The double-handed internal gear pump according to claim 1, wherein,
an oil drain port (2.7) is arranged on the pump cover and used for conveying hydraulic oil leaked from the high-pressure area back to the oil tank;
the pump cover and the pump body are provided with an oil discharge channel communicated with the oil drain port, and the oil discharge channel comprises:
a fifth volume chamber (11.1.1) surrounded by the back plane of the first stop pin (11.1) and the mounting hole of the pump cover; one end of the fifth volume cavity (11.1.1) is communicated with the oil drain port, and the other end of the fifth volume cavity is communicated with the third volume cavity (19) and the fourth volume cavity (20) through a notch of the first axial plate (12.1);
the third volume cavity (19) and the fourth volume cavity (20) are communicated with an oil hole (1.2) on the pump body through a notch of the second axial plate (12.2), and the oil hole (1.2) is communicated with a sealing cavity (1.1) of the framework oil seal;
the oil drain port is directly connected with the oil tank through an oil pipe, and the back pressure of the oil drain port is kept to be low.
5. The double-handed internal gear pump according to claim 4, wherein,
the notch of the first axial plate includes: a first gap (12.1.4) and a second gap (12.1.5), wherein the first gap (12.1.4) is in communication with the third volume chamber (19);
the second gap (12.1.5) is communicated with the fourth volume cavity (20);
the notch of the second axial plate includes: the third notch (12.2.4) and the fourth notch (12.2.5), wherein the third notch (12.2.4) is communicated with the oil hole (1.2), and the fourth notch (12.2.5) is communicated with the oil hole (1.2) through a sink groove (1.3) on the pump body.
6. The double-rotation-direction internal gear pump according to claim 1, wherein the first oil passage comprises a first oil port (2.1) and a second oil port (2.2) which are communicated with each other, wherein the second oil port (2.2) is communicated with the first connecting hole (12.1.1);
the second oil duct comprises a third oil port (2.4) and a fourth oil port (2.3) which are communicated with each other, wherein the fourth oil port (2.3) is communicated with the second connecting hole (12.1.2).
7. The double-handed internal gear pump according to claim 4, wherein,
a sliding bearing (3) is arranged on the matching surface of the pump body and the gear ring, and an oil groove (3.1) for oil drainage is arranged on the inner wall adjacent to the sliding bearing and the gear ring;
the notch (12.1.5) on the first axial plate is communicated with a first annular space (12.1.3) between the first axial plate and the sliding bearing, and the notch (12.2.5) on the second axial plate is communicated with a second annular space (12.2.3) between the second axial plate and the sliding bearing; the first annular space is communicated with the second annular space through an oil groove (3.1) on the sliding bearing.
CN202211661307.7A 2022-12-23 2022-12-23 Double-rotation-direction internal gear pump Pending CN116163948A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211661307.7A CN116163948A (en) 2022-12-23 2022-12-23 Double-rotation-direction internal gear pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211661307.7A CN116163948A (en) 2022-12-23 2022-12-23 Double-rotation-direction internal gear pump

Publications (1)

Publication Number Publication Date
CN116163948A true CN116163948A (en) 2023-05-26

Family

ID=86410352

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211661307.7A Pending CN116163948A (en) 2022-12-23 2022-12-23 Double-rotation-direction internal gear pump

Country Status (1)

Country Link
CN (1) CN116163948A (en)

Similar Documents

Publication Publication Date Title
CN102434415A (en) Low-noise axial plunger pump based on indexing angle of pumps in series
US7140846B2 (en) Vacuum pump having main and sub pumps
KR100552597B1 (en) Volumetric rotary pump
CA2712550A1 (en) Variable-volume internal gear pump
CN101949374A (en) Swash plate type valve distributing high-pressure pure water plunger pump
CN201218200Y (en) Displacement-variable inner-meshing rotor pump
CN117419020A (en) High-pressure valve flow distribution plunger pump
CN116163948A (en) Double-rotation-direction internal gear pump
CN112523985B (en) Radial plunger pump
CN214424691U (en) Triangular rotor pump
CN213627990U (en) Combined internal gear pump of pin vane pump
CN101985930B (en) Rotor type deep submersible pump
CN100357605C (en) Cycloidal pin gear hydraulic pump
CN112253451A (en) Combined internal gear pump of pin vane pump
CN112879283A (en) Triangular rotor pump
CN208431159U (en) Double acting oil pump
CN108412717B (en) Unmanned ship hydraulic pump sliding shoe bottom static pressure supporting device and control method
CN206942997U (en) A kind of magnetically-actuated Mini gear pump in pipeline
KR100804730B1 (en) Oil pump
CN219220703U (en) Built-in cycloid pump
CN216788628U (en) High-pressure heavy-load axial plunger pump
CN215370184U (en) Double-pump-cavity reciprocating pump
CN114810582B (en) Shielding type internal engaged cycloidal gear pump
CN216278454U (en) Pressure-equalizing gear oil pump
KR102654552B1 (en) rotating positive displacement pump

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination