CN110374865B - Variable gear pump - Google Patents
Variable gear pump Download PDFInfo
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- CN110374865B CN110374865B CN201910787088.9A CN201910787088A CN110374865B CN 110374865 B CN110374865 B CN 110374865B CN 201910787088 A CN201910787088 A CN 201910787088A CN 110374865 B CN110374865 B CN 110374865B
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- hole
- oil
- pressure relief
- left end
- end cover
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- 230000009471 action Effects 0.000 claims description 9
- 239000003921 oil Substances 0.000 description 136
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
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- 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
- F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
- F04C14/185—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by varying the useful pumping length of the cooperating members in the axial direction
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- 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
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- 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
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
The invention discloses a variable gear pump, which comprises a pump shell, a left end cover arranged at the left end of the pump shell and a right end cover arranged at the right end of the pump shell, wherein the left end cover is arranged at the left end of the pump shell; a driven shaft and a driving shaft are rotatably connected between a left end cover and a right end cover in the pump shell, the right end of the driving shaft extends out of the right end cover, a first driving gear is fixedly mounted on the driving shaft in the pump shell, and a first driven gear meshed with the first driving gear is rotatably connected to the driven shaft; an oil suction port and an oil discharge port are respectively arranged on the two sides of the meshing area of the first driving gear and the first driven gear on the pump shell; a second driving gear which is parallel to the first driving gear is arranged on the driving shaft in the pump shell, a second driven gear which is meshed with the second driving gear is rotatably connected to the driven shaft, and the second driven gear and the first driven gear are arranged in parallel; a variable control assembly is arranged in the left end cover; the variable gear pump is simple in structure and convenient to install.
Description
Technical Field
The invention belongs to the technical field of gear pumps, and particularly relates to a variable gear pump.
Background
The gear pump is a kind of equipment that hydraulic machinery field often used, wherein variable gear pump is the equipment that needs to be used under many special occasions again, variable gear pump mainly divide into crescent variable gear pump and external toothing variable gear pump two kinds, and the leading principle of two kinds of current variable gear pumps is through changing the mesh length between first driving gear and the first driven gear and realize the purpose of variable, can appear because mesh length shortens and produce the problem that leaks and increase at the in-process of variable, and control variable's mechanism is more complicated moreover, variable effect is also not obvious.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a variable gear pump which is simple in structure and can realize the mutual combination of variable and quantitative functions so as to adapt to more complex working environments.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a variable gear pump comprises a pump shell, a left end cover arranged at the left end of the pump shell and a right end cover arranged at the right end of the pump shell; a driven shaft and a driving shaft are rotatably connected between a left end cover and a right end cover in the pump shell, the right end of the driving shaft extends out of the right end cover, a first driving gear is fixedly mounted on the driving shaft in the pump shell, and a first driven gear meshed with the first driving gear is rotatably connected to the driven shaft; an oil suction port and an oil discharge port are respectively arranged on the two sides of the meshing area of the first driving gear and the first driven gear on the pump shell; a second driving gear which is parallel to the first driving gear is arranged on the driving shaft in the pump shell, a second driven gear which is meshed with the second driving gear is rotatably connected to the driven shaft, and the second driven gear and the first driven gear are arranged in parallel; and a variable control assembly is arranged in the left end cover, when the pressure of the oil discharge port is smaller than a preset value, the variable control assembly controls the driving shaft to drive the second driving gear to rotate, and when the pressure of the oil discharge port is larger than the preset value, the variable control assembly controls the driving shaft not to drive the second driving gear to rotate.
Through the technical scheme, when the variable gear pump works, the driving shaft extending out of the right end cover is connected with the motor, the motor is electrified to drive the driving shaft to rotate, the driving shaft drives the first driving gear to rotate, and the first driven gear rotates along with the first driven gear due to the meshing of the first driven gear and the first driving gear; when the pressure of the oil outlet is smaller than a preset value, the variable control assembly controls the driving shaft to drive the second driving gear to rotate, and the second driven gear rotates along with the second driving gear due to the meshing of the second driven gear and the second driving gear, so that the flow of the gear pump is increased; when the pressure of the oil outlet is larger than a preset value, the variable control assembly controls the driving shaft not to drive the second driving gear to rotate, and at the moment, the driving shaft only drives the first driving gear and the first driven gear to rotate, so that the flow of the gear pump is reduced, and the variable of the gear pump is realized.
In a further technical scheme, the variable control assembly comprises an overflow valve, a pressure relief valve assembly, a variable plunger and a first spring, wherein a plunger hole is formed in one end, located in the left end cover, of the driving shaft, and extends to an inner shaft hole of the second driving gear; the side surface of the driving shaft is symmetrically provided with two inserting sliding grooves communicated with the plunger piston hole; the variable plunger is connected in the plunger hole in a sliding manner, the two inserting chutes are connected with inserting blocks in a sliding manner, and the side surface of the inner shaft hole of the second driving gear is provided with a ratchet groove for inserting the inserting blocks; two first connecting rods are hinged to the plunger hole side by side in each inserting sliding groove, and the other ends of the two first connecting rods are hinged to the inserting block; the variable plunger piston is symmetrically hinged with two second connecting rods respectively positioned in the two inserting chutes on the side surface close to the right end, and the other end of each second connecting rod is hinged on the inserting block; when the variable plunger piston moves leftwards, the inserting block extends out of the inserting chute and is inserted into the ratchet groove under the action of the first connecting rod and the second connecting rod; when the variable plunger piston moves rightwards, the inserting block is separated from the ratchet groove and retracts into the inserting chute under the action of the first connecting rod and the second connecting rod; the first spring is positioned in the plunger hole and used for forcing the variable plunger to move leftwards;
a first control cavity is formed between the left end of the variable plunger and the left end cover; the pump shell and the left end cover are internally provided with a first oil hole communicated with an oil inlet of the overflow valve, and the left end cover is internally provided with a second oil hole communicated with an oil outlet of the overflow valve and a third oil hole communicated with the first control cavity; a fourth oil hole used for communicating the second oil hole and the third oil hole and a fifth oil hole used for communicating an oil inlet of the overflow valve and a control oil cavity of the pressure release valve assembly are formed in the left end cover; a sixth oil hole communicated with the oil outlet of the pressure relief valve assembly and a seventh oil hole used for communicating the oil inlet of the pressure relief valve assembly and the second oil hole are formed in the left end cover; and an eighth oil hole for communicating the oil suction port with the sixth oil hole is formed in the pump shell and the left end cover.
In a further technical scheme, an annular groove and two square sliding grooves communicated with the annular groove are formed in the left end cover on the outer side of the circumference of the left end of the driving shaft; a clamping groove is formed in the end face, facing the left end cover, of the second driving gear; a first circular arc-shaped braking sheet and a second circular arc-shaped braking sheet which both extend into the braking groove are symmetrically arranged in the annular groove; the upper end and the lower end of the first circular arc-shaped braking sheet are respectively provided with a first convex plate extending into the square sliding groove, and the upper end and the lower end of the second circular arc-shaped braking sheet are respectively provided with a second convex plate extending into the square sliding groove; a second spring is arranged between the first convex plate and the second convex plate in each square sliding groove and is used for forcing the first convex plate and the second convex plate to move towards opposite directions; a first sliding hole and a second sliding hole which are communicated with the annular groove are formed in the left end cover on two sides of the annular groove along the length direction of the second spring; a first plunger is connected in the first sliding hole in a sliding manner, and a second plunger is connected in the second sliding hole in a sliding manner; a first plug is arranged at one end, far away from the annular groove, of the first sliding hole, and a second plug is arranged at one end, far away from the annular groove, of the second sliding hole; a first plunger cavity is formed between the first plunger and the first plug, and a second plunger cavity is formed between the second plunger and the second plug; a ninth oil hole communicated with the fourth oil hole is formed in the left end cover; and a tenth oil hole used for communicating the ninth oil hole with the first plunger cavity and an eleventh oil hole used for communicating the ninth oil hole with the second plunger cavity are formed in the left end cover.
In a further technical scheme, the pressure relief valve assembly comprises a pressure relief valve core, a pressure relief spring and a pressure relief plug; the left end cover is provided with a first pressure relief valve hole, and a second pressure relief valve hole is formed in the bottom of the first pressure relief valve hole in the left end cover; the sixth oil hole is communicated with the second pressure relief valve hole and is positioned at the center of the bottom of the second pressure relief valve hole, and the seventh oil hole is communicated with the second pressure relief valve hole and is positioned at the side position of the second pressure relief valve hole; the pressure relief valve core is connected in the first pressure relief valve hole in a sliding manner, a convex column connected in the second pressure relief valve hole in a sliding manner is arranged on the pressure relief valve core, and the convex column is used for controlling the connection and disconnection of the sixth oil hole and the seventh oil hole; the pressure relief plug is arranged at the opening position of the first pressure relief valve hole; the pressure relief spring is sleeved on the convex column and used for forcing the pressure relief valve core to move towards the pressure relief plug; a control oil cavity is formed between the pressure relief valve core and the pressure relief plug; when the pressure of the oil pressure in the control oil cavity acting on the pressure relief valve core is larger than the pretightening force of the pressure relief spring, the convex column is tightly pressed on the sixth oil hole so that the sixth oil hole and the seventh oil hole are disconnected; when the pressure of the oil pressure in the control oil cavity acting on the pressure relief valve core is smaller than the pretightening force of the pressure relief spring, the convex column leaves the sixth oil hole so that the sixth oil hole is communicated with the seventh oil hole.
(III) advantageous effects
Compared with the prior art, the technical scheme of the invention has the following advantages:
when the variable gear pump works, a driving shaft extending out of a right end cover is connected with a motor, the motor is electrified to drive the driving shaft to rotate, the driving shaft drives a first driving gear to rotate, and a first driven gear rotates along with the first driven gear due to the meshing of the first driven gear and the first driving gear; when the pressure of the oil outlet is smaller than a preset value, the variable control assembly controls the driving shaft to drive the second driving gear to rotate, and the second driven gear rotates along with the second driving gear due to the meshing of the second driven gear and the second driving gear, so that the flow of the gear pump is increased; when the pressure of the oil outlet is larger than a preset value, the variable control assembly controls the driving shaft not to drive the second driving gear to rotate, and the driving shaft only drives the first driving gear and the first driven gear to rotate, so that the flow of the gear pump is reduced, and the variable of the gear pump is realized; the variable gear pump is simple in structure and convenient to install.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a left side view of the present invention;
FIG. 4 is a top view of the present invention;
FIG. 5 is a sectional view taken along line A-A of FIG. 2;
FIG. 6 is a sectional view taken along line B-B of FIG. 3;
FIG. 7 is a sectional view taken along line C-C of FIG. 3;
FIG. 8 is a sectional view taken along line D-D of FIG. 7;
FIG. 9 is a sectional view taken along line E-E of FIG. 8;
FIG. 10 is a sectional view taken in the direction F-F of FIG. 6;
FIG. 11 is an enlarged view of the structure of FIG. 9 at G;
FIG. 12 is a perspective view of the left end cap of the present invention;
FIG. 13 is a view showing the construction of a first circular arc-shaped brake pad according to the present invention;
FIG. 14 is a structural view of a second driving gear of the present invention;
FIG. 15 is a structural view of the pressure relief valve cartridge of the present invention;
FIG. 16 is a block diagram of a variable displacement plunger of the present invention;
FIG. 17 is a block diagram of the plug block of the present invention;
FIG. 18 is a structural view of the drive shaft of the present invention.
Detailed Description
Referring to fig. 1 to 18, a variable gear pump includes a pump housing 2, a left end cap 1 disposed at a left end of the pump housing 2, and a right end cap 3 disposed at a right end of the pump housing 2; a driven shaft 9 and a driving shaft 8 are rotatably connected between the left end cover 1 and the right end cover 3 in the pump shell 2, the right end of the driving shaft 8 extends out of the right end cover 3, a first driving gear 7 is fixedly mounted on the driving shaft 8 in the pump shell 2, and a first driven gear 10 meshed with the first driving gear 7 is rotatably connected to the driven shaft 9; an oil suction port 201 and an oil discharge port 202 are respectively arranged on the two sides of the meshing area of the first driving gear 7 and the first driven gear 10 on the pump shell 2; a second driving gear 6 which is parallel to the first driving gear 7 is arranged on a driving shaft 8 in the pump shell 2, a second driven gear 11 which is meshed with the second driving gear 6 is rotatably connected to a driven shaft 9, and the second driven gear 11 and the first driven gear 10 are arranged in parallel; the variable control assembly is arranged in the left end cover 1, when the pressure of the oil discharge port 202 is smaller than a preset value, the variable control assembly controls the driving shaft 8 to drive the second driving gear 6 to rotate, and when the pressure of the oil discharge port 202 is larger than the preset value, the variable control assembly controls the driving shaft 8 not to drive the second driving gear 6 to rotate.
The variable control assembly comprises an overflow valve 4, a pressure relief valve assembly 5, a variable plunger 12 and a first spring 16, wherein a plunger hole 801 is formed in one end, located in the left end cover 1, of the driving shaft 8, and the plunger hole 801 extends to an inner shaft hole of the second driving gear 6; the side surface of the driving shaft 8 is symmetrically provided with two inserting sliding grooves 8b communicated with the plunger hole 801; the variable plunger 12 is slidably connected in the plunger hole 801, the two inserting chutes 8b are slidably connected with the inserting blocks 13, and the side surface of the inner shaft hole of the second driving gear 6 is provided with a ratchet groove 6a for inserting the inserting blocks 13; two first connecting rods 14 are hinged to the position, close to the plunger hole 801, of each inserting sliding groove 8b side by side, and the other ends of the two first connecting rods 14 are hinged to the inserting block 13; the side surface of the variable plunger 12 close to the right end is symmetrically hinged with two second connecting rods 15 respectively positioned in the two inserting sliding grooves 8b, and the other end of each second connecting rod 15 is hinged on the inserting block 13; when the variable plunger 12 moves leftwards, the inserting block 13 extends out of the inserting chute 8b and is inserted into the ratchet groove 6a under the action of the first connecting rod 14 and the second connecting rod 15; when the variable plunger 12 moves to the right, the insertion block 13 is separated from the ratchet groove 6a and retracts into the insertion chute 8b under the action of the first connecting rod 14 and the second connecting rod 15; the first spring 16 is located within the plunger bore 801 for urging the variable displacement plunger 12 to the left.
A first control cavity 8a is formed between the left end of the variable plunger 12 and the left end cover 1; the overflow valve 4 and the pressure relief valve assembly 5 are inserted and mounted on the left end cover 1, a first oil hole 2a communicated with an oil inlet of the overflow valve 4 is formed in the pump shell 2 and the left end cover 1, and a second oil hole 1d communicated with an oil outlet of the overflow valve 4 and a third oil hole 1b communicated with the first control cavity 8a are formed in the left end cover 1; a fourth oil hole 1a for communicating the second oil hole 1d with the third oil hole 1b and a fifth oil hole 1e for communicating an oil inlet of the overflow valve 4 with a control oil chamber of the pressure release valve assembly 5 are formed in the left end cover 1; a sixth oil hole 1g communicated with an oil outlet of the pressure relief valve assembly 5 and a seventh oil hole 1f for communicating an oil inlet of the pressure relief valve assembly 5 with the second oil hole 1d are formed in the left end cover 1; an eighth oil hole 2b for communicating the oil suction port 201 and the sixth oil hole 1g is formed in the pump case 2 and the left end cover 1.
An annular groove 101 and two square sliding grooves 102 communicated with the annular groove 101 are formed in the left end cover 1 and on the outer side of the circumference of the left end of the driving shaft 8; a tight braking groove 6b is formed in the end face, facing the left end cover 1, of the second driving gear 6; a first circular arc-shaped braking and tightening piece 17a and a second circular arc-shaped braking and tightening piece 17b which extend into the braking and tightening groove 6b are symmetrically arranged in the annular groove 101; the upper end and the lower end of the first circular arc-shaped braking piece 17a are respectively provided with a first convex plate 17a1 extending into the square sliding groove 102, and the upper end and the lower end of the second circular arc-shaped braking piece 17b are respectively provided with a second convex plate 17b1 extending into the square sliding groove 102; a second spring 18 is arranged in each square sliding groove 102 between the first convex plate 17a1 and the second convex plate 17b1, and the second spring 18 is used for forcing the first convex plate 17a1 and the second convex plate 17b1 to move towards opposite directions; a first sliding hole 103 and a second sliding hole 104 which are communicated with the annular groove 101 are formed in the left end cover 1 on two sides of the annular groove 101 along the length direction of the second spring 18; a first plunger 1901 is slidably connected in the first sliding hole 103, and a second plunger 1902 is slidably connected in the second sliding hole 104; the first sliding hole 103 is provided with a first plug 66a at one end far away from the annular groove 101, and the second sliding hole 104 is provided with a second plug 66b at one end far away from the annular groove 101; a first plunger cavity 19a is formed between the first plunger 1901 and the first plug 66a, and a second plunger cavity 19b is formed between the second plunger 1902 and the second plug 66 b; a ninth oil hole 1c communicated with the fourth oil hole 1a is formed in the left end cover 1; the left end cover 1 is provided therein with a tenth oil hole 1i for communicating the ninth oil hole 1c with the first plunger chamber 19a, and an eleventh oil hole 1j for communicating the ninth oil hole 1c with the second plunger chamber 19 b.
The pressure relief valve assembly 5 comprises a pressure relief valve core 20, a pressure relief spring 21 and a pressure relief plug 88; a first pressure relief valve hole 105 is formed in the left end cover 1, and a second pressure relief valve hole 106 is formed in the bottom of the first pressure relief valve hole in the left end cover 1; the sixth oil hole 1g and the second relief valve hole 106 are located at the bottom center of the second relief valve hole 106, and the seventh oil hole 1f is communicated with the second relief valve hole 106 and is located at the side of the second relief valve hole 106; the pressure relief valve core 20 is connected in the first pressure relief valve hole 105 in a sliding manner, a convex column 20a connected in the second pressure relief valve hole 106 in a sliding manner is arranged on the pressure relief valve core 20, and the convex column 20a is used for controlling the connection and disconnection of the sixth oil hole 1g and the seventh oil hole 1 f; the pressure relief plug 88 is arranged at the opening position of the first pressure relief valve hole 105; the pressure relief spring 21 is sleeved on the convex column 20a and used for forcing the pressure relief valve core 20 to move towards the pressure relief plug 88; a control oil cavity 1m is formed between the pressure relief valve core 20 and the pressure relief plug 88; when the pressure of the oil pressure in the control oil chamber 1m acting on the pressure relief valve core 20 is greater than the pretightening force of the pressure relief spring 21, the convex column 20a is pressed on the sixth oil hole 1g so that the sixth oil hole 1g and the seventh oil hole 1f are disconnected; when the pressure of the oil pressure in the control oil chamber 1m acting on the relief valve core 20 is smaller than the pre-tightening force of the relief spring 21, the boss 20a leaves the sixth oil hole 1g so that the sixth oil hole 1g and the seventh oil hole 1f are communicated.
When the variable gear pump works, firstly, a driving shaft 8 extending out of a right end cover 3 is connected with a motor, the motor is electrified to drive the driving shaft 8 to rotate, the driving shaft 8 of the driving shaft 8 is connected with a first driving gear 7 through a flat key so as to drive the first driving gear 7 to rotate, and due to the meshing of a first driven gear 10 and the first driving gear 7, the first driven gear 10 also rotates; when the first driving gear 7 and the first driven gear 10 rotate, the volume of the space on the gear disengagement side becomes larger from small to form vacuum, and the liquid is sucked from the oil suction port 201, and the volume of the space on the gear engagement side becomes smaller from large to squeeze the liquid into the pipeline from the oil discharge port 202. At this time, the pressure of the oil discharge port 202 is smaller than the preset value, the first spring 16 pushes the variable plunger 12 to move leftward, the plug-in block 13 extends out of the plug-in chute 8b and is inserted into the ratchet groove 6a under the action of the first connecting rod 14 and the second connecting rod 15, so that the second driving gear 6 rotates along with the driving shaft 8, and due to the meshing of the second driven gear 11 and the second driving gear 6, the second driven gear 11 also rotates along with the driving shaft, thereby increasing the flow rate of the gear pump.
When the pressure of the oil outlet 202 is greater than the set pressure of the relief valve 4, the relief valve 4 is opened, and the pressure acting on the boss 20a is the same as that acting on the relief valve element 20, but because the pressure area of the relief valve element 20 is greater than the cross section of the boss 20a, the relief valve element 20 drives the boss 20a to overcome the pretightening force of the relief spring 21 and press the boss on the sixth oil hole 1g, so that the sixth oil hole 1g and the seventh oil hole 1f are disconnected. Pressure oil enters the first control cavity 8a through the first oil hole 2a, the overflow valve 4, the second oil hole 1d, the fourth oil hole 1a and the third oil hole 1b, at the moment, the pressure at the first control cavity 8a is equal to the pressure at the oil discharge port 202, at the moment, the variable plunger 12 overcomes the pretightening force of the first spring 16 to push the variable plunger 12 to move rightwards, the insertion block 13 is separated from the ratchet groove 6a and retracts into the insertion sliding groove under the action of the first connecting rod 14 and the second connecting rod 15, so that the driving shaft 8 is separated from the second driving gear 6, and the second driving gear 6 does not rotate along with the second driving gear. Meanwhile, the pressure oil enters the first plunger cavity 19a and the second plunger cavity 19b through the first oil hole 2a, the relief valve 4, the second oil hole 1d, the fourth oil hole 1a, the ninth oil hole 1c, the tenth oil hole 1i and the eleventh oil hole 1j, the first plunger 1901 and the second plunger 1902 are pushed to move oppositely, the first circular arc brake pad 17a and the second circular arc brake pad 17b are pushed to the middle against the pretightening force of the second spring 18, the pressure oil is locked on the side surface of the brake slot 6b to prevent the second driving gear 6 from rotating, at this time, the gear pump stops the second driving gear 6 and the second driven gear 11, the displacement becomes 1/2, and the variable is completed.
When the pressure of the oil outlet 202 is smaller than the pressure set by the relief valve 4 again, the relief valve 4 is closed, the relief spring 21 overcomes the pressure of the hydraulic oil acting on the relief valve core 20, and pushes the relief valve core 20 to drive the boss 20a to leave the sixth oil hole 1g, so that the sixth oil hole 1g and the seventh oil hole 1f are communicated, the hydraulic oil in the first control chamber 8a flows into the oil suction port 201 through the flow passage, the third oil hole 1b, the fourth oil hole 1a, the second oil hole 1d, the seventh oil hole 1f, the sixth oil hole 1g and the eighth oil hole 2b, the pressure in the first control chamber 8a is equal to the pressure in the oil suction port 201, the first spring 16 pushes the variable plunger 12 to move leftward, the plug block 13 extends out of the plug chute 8b under the action of the first connecting rod 14 and the second connecting rod 15 and is inserted into the ratchet groove 6a, so that the second driving gear 6 rotates along with the driving shaft. Meanwhile, the pressure oil in the first plunger cavity 19a and the second plunger cavity 19b respectively flows into the oil suction port 201 through the tenth oil hole 1i, the eleventh oil hole 1j, the ninth oil hole 1c, the fourth oil hole 1a, the second oil hole 1d, the seventh oil hole 1f, the sixth oil hole 1g and the eighth oil hole 2b, at this time, the pressure at the first plunger cavity 19a and the first plunger cavity 19a is equal to the pressure at the oil suction port 201, and the second spring 18 pushes the first circular-arc-shaped brake pad 17a and the second circular-arc-shaped brake pad 17b to open the first circular-arc-shaped brake pad and the second circular-arc-shaped brake pad, so that the second driving gear 6 can rotate, and the variable gear pump can work at full displacement.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A variable gear pump comprises a pump shell, a left end cover arranged at the left end of the pump shell and a right end cover arranged at the right end of the pump shell; a driven shaft and a driving shaft are rotatably connected between a left end cover and a right end cover in the pump shell, the right end of the driving shaft extends out of the right end cover, a first driving gear is fixedly mounted on the driving shaft in the pump shell, and a first driven gear meshed with the first driving gear is rotatably connected to the driven shaft; an oil suction port and an oil discharge port are respectively arranged on the two sides of the meshing area of the first driving gear and the first driven gear on the pump shell; the pump is characterized in that a second driving gear which is parallel to the first driving gear is arranged on the driving shaft in the pump shell, a second driven gear which is meshed with the second driving gear is rotatably connected to the driven shaft, and the second driven gear and the first driven gear are arranged in parallel; the left end cover is internally provided with a variable control assembly, when the pressure of the oil discharge port is smaller than a preset value, the variable control assembly controls the driving shaft to drive the second driving gear to rotate, and when the pressure of the oil discharge port is larger than the preset value, the variable control assembly controls the driving shaft not to drive the second driving gear to rotate;
the variable control assembly comprises an overflow valve, a pressure relief valve assembly, a variable plunger and a first spring, wherein a plunger hole is formed in one end, located in the left end cover, of the driving shaft, and the plunger hole extends to an inner shaft hole of the second driving gear; the side surface of the driving shaft is symmetrically provided with two inserting sliding grooves communicated with the plunger piston hole; the variable plunger is connected in the plunger hole in a sliding manner, the two inserting chutes are connected with inserting blocks in a sliding manner, and the side surface of the inner shaft hole of the second driving gear is provided with a ratchet groove for inserting the inserting blocks; two first connecting rods are hinged to the plunger hole side by side in each inserting sliding groove, and the other ends of the two first connecting rods are hinged to the inserting block; the variable plunger piston is symmetrically hinged with two second connecting rods respectively positioned in the two inserting chutes on the side surface close to the right end, and the other end of each second connecting rod is hinged on the inserting block; when the variable plunger piston moves leftwards, the inserting block extends out of the inserting chute and is inserted into the ratchet groove under the action of the first connecting rod and the second connecting rod; when the variable plunger piston moves rightwards, the inserting block is separated from the ratchet groove and retracts into the inserting chute under the action of the first connecting rod and the second connecting rod; the first spring is positioned in the plunger hole and used for forcing the variable plunger to move leftwards;
a first control cavity is formed between the left end of the variable plunger and the left end cover; the pump shell and the left end cover are internally provided with a first oil hole communicated with an oil inlet of the overflow valve, and the left end cover is internally provided with a second oil hole communicated with an oil outlet of the overflow valve and a third oil hole communicated with the first control cavity; a fourth oil hole used for communicating the second oil hole and the third oil hole and a fifth oil hole used for communicating an oil inlet of the overflow valve and a control oil cavity of the pressure release valve assembly are formed in the left end cover; a sixth oil hole communicated with the oil outlet of the pressure relief valve assembly and a seventh oil hole used for communicating the oil inlet of the pressure relief valve assembly and the second oil hole are formed in the left end cover; an eighth oil hole for communicating the oil suction port with the sixth oil hole is formed in the pump shell and the left end cover;
the left end cover is provided with an annular groove and two square sliding grooves communicated with the annular groove on the outer side of the circumference of the left end of the driving shaft; a clamping groove is formed in the end face, facing the left end cover, of the second driving gear; a first circular arc-shaped braking sheet and a second circular arc-shaped braking sheet which both extend into the braking groove are symmetrically arranged in the annular groove; the upper end and the lower end of the first circular arc-shaped braking sheet are respectively provided with a first convex plate extending into the square sliding groove, and the upper end and the lower end of the second circular arc-shaped braking sheet are respectively provided with a second convex plate extending into the square sliding groove; a second spring is arranged between the first convex plate and the second convex plate in each square sliding groove and is used for forcing the first convex plate and the second convex plate to move towards opposite directions; a first sliding hole and a second sliding hole which are communicated with the annular groove are formed in the left end cover on two sides of the annular groove along the length direction of the second spring; a first plunger is connected in the first sliding hole in a sliding manner, and a second plunger is connected in the second sliding hole in a sliding manner; a first plug is arranged at one end, far away from the annular groove, of the first sliding hole, and a second plug is arranged at one end, far away from the annular groove, of the second sliding hole; a first plunger cavity is formed between the first plunger and the first plug, and a second plunger cavity is formed between the second plunger and the second plug; a ninth oil hole communicated with the fourth oil hole is formed in the left end cover; and a tenth oil hole used for communicating the ninth oil hole with the first plunger cavity and an eleventh oil hole used for communicating the ninth oil hole with the second plunger cavity are formed in the left end cover.
2. The variable gear pump of claim 1, wherein the pressure relief valve assembly comprises a pressure relief valve spool, a pressure relief spring, a pressure relief plug; the left end cover is provided with a first pressure relief valve hole, and a second pressure relief valve hole is formed in the bottom of the first pressure relief valve hole in the left end cover; the sixth oil hole is communicated with the second pressure relief valve hole and is positioned at the center of the bottom of the second pressure relief valve hole, and the seventh oil hole is communicated with the second pressure relief valve hole and is positioned at the side position of the second pressure relief valve hole; the pressure relief valve core is connected in the first pressure relief valve hole in a sliding manner, a convex column connected in the second pressure relief valve hole in a sliding manner is arranged on the pressure relief valve core, and the convex column is used for controlling the connection and disconnection of the sixth oil hole and the seventh oil hole; the pressure relief plug is arranged at the opening position of the first pressure relief valve hole; the pressure relief spring is sleeved on the convex column and used for forcing the pressure relief valve core to move towards the pressure relief plug; a control oil cavity is formed between the pressure relief valve core and the pressure relief plug; when the pressure of the oil pressure in the control oil cavity acting on the pressure relief valve core is larger than the pretightening force of the pressure relief spring, the convex column is tightly pressed on the sixth oil hole so that the sixth oil hole and the seventh oil hole are disconnected; when the pressure of the oil pressure in the control oil cavity acting on the pressure relief valve core is smaller than the pretightening force of the pressure relief spring, the convex column leaves the sixth oil hole so that the sixth oil hole is communicated with the seventh oil hole.
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| CN201910787088.9A CN110374865B (en) | 2019-08-25 | 2019-08-25 | Variable gear pump |
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| CN110374865B true CN110374865B (en) | 2020-10-13 |
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| CN115711226B (en) * | 2022-11-25 | 2023-07-04 | 河北恒盛泵业股份有限公司 | Self-pressure-relief gear pump |
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| JPH09112442A (en) * | 1995-10-16 | 1997-05-02 | Sekisui Chem Co Ltd | Gear pump |
| CN201407170Y (en) * | 2009-05-18 | 2010-02-17 | 苗新波 | Variable gear wheel pump |
| CN101858346A (en) * | 2009-04-10 | 2010-10-13 | 本田技研工业株式会社 | Gear pump |
| CN106593869A (en) * | 2015-10-16 | 2017-04-26 | 珠海格力节能环保制冷技术研究中心有限公司 | Two-stage variable-capacity compressor and air conditioning system provided with same |
| CN107061261A (en) * | 2017-04-30 | 2017-08-18 | 刘泽奎 | A kind of gear pump with variable capacity |
| CN110017275A (en) * | 2019-04-12 | 2019-07-16 | 桐庐海普机电设备有限公司 | A kind of gear pump and its working method |
-
2019
- 2019-08-25 CN CN201910787088.9A patent/CN110374865B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09112442A (en) * | 1995-10-16 | 1997-05-02 | Sekisui Chem Co Ltd | Gear pump |
| CN101858346A (en) * | 2009-04-10 | 2010-10-13 | 本田技研工业株式会社 | Gear pump |
| CN201407170Y (en) * | 2009-05-18 | 2010-02-17 | 苗新波 | Variable gear wheel pump |
| CN106593869A (en) * | 2015-10-16 | 2017-04-26 | 珠海格力节能环保制冷技术研究中心有限公司 | Two-stage variable-capacity compressor and air conditioning system provided with same |
| CN107061261A (en) * | 2017-04-30 | 2017-08-18 | 刘泽奎 | A kind of gear pump with variable capacity |
| CN110017275A (en) * | 2019-04-12 | 2019-07-16 | 桐庐海普机电设备有限公司 | A kind of gear pump and its working method |
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Effective date of registration: 20210113 Address after: 215000 standard workshop, No.47, No.9 Dongfu Road, Suzhou Industrial Park, Jiangsu Province Patentee after: Konsk pump (Suzhou) Co.,Ltd. Address before: 710089 building 28, lanbowan, Yanliang District, Xi'an City, Shaanxi Province Patentee before: Fu Peng |
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