CN110017275A - A kind of gear pump and its working method - Google Patents
A kind of gear pump and its working method Download PDFInfo
- Publication number
- CN110017275A CN110017275A CN201910295576.8A CN201910295576A CN110017275A CN 110017275 A CN110017275 A CN 110017275A CN 201910295576 A CN201910295576 A CN 201910295576A CN 110017275 A CN110017275 A CN 110017275A
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- pressure oil
- passage
- gear group
- pressure
- suction passage
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000446 fuel Substances 0.000 claims abstract description 11
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 210000000988 bone and bone Anatomy 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 210000000038 chest Anatomy 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
- F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
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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
- 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
- F04C15/064—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston machines or pumps
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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
- F04C2/18—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 with similar tooth forms
Abstract
The present invention relates to a kind of gear pump and its working methods, including one-stage gear group and secondary gear group, the first suction passage communicated with oil inlet is formed between one lateral tooth flank of one-stage gear group and pump housing inner wall, the second suction passage is formed between the lateral tooth flank and pump housing inner wall of secondary gear group, the first pressure oil passage is formed between another lateral tooth flank and pump housing inner wall of one-stage gear group, and the second pressure oil passage communicated with oil outlet is formed between another lateral tooth flank and pump housing inner wall of secondary gear group；Transfer bar mechanism is by moving left and right, communicate the first suction passage and the second suction passage, first pressure oil passage and the second pressure oil passage communicate, or, it is not communicated with the first suction passage and the second suction passage, first pressure oil passage and the second pressure oil passage are not communicated with, and the second pressure oil passage and the second suction passage communicate.The application is realized from one-stage gear group to secondary gear group fuel feeding, and the bearing of secondary gear group and gear is protected not to damage, and realizes the working condition of high pressure.
Description
Technical field
The present invention relates to pump fields, in particular, being related to a kind of gear pump and its working method.
Background technique
Gear pump is that swept volume changes and movement is to convey liquid or make by being formed by between pumping cylinder and meshing gear
Pressurization drum pump.Two enclosure spaces are formed by two gears, the pump housing and front and rear covers, when gear rotation, are out of gear
The volume in the space of side becomes larger from small, forms vacuum, draws liquid into, the volume in the space of gear engagement side from becoming smaller greatly, and
Liquid is squeezed into pipeline.
For the amount pressure of gear pump generally in 18Mpa-20Mpa, work, gear pump internal cavity is divided into low-pressure area at present
(at oil inlet) and higher-pressure region (oil outlet), in normal work, gear shaft and working flank all can be because pressure difference be by height for pump
Pressure area presses to low-pressure area, and the flank of tooth of low-pressure area can press pump housing side at this time, to occur sweeping thorax phenomenon, gear shaft also can be by height
Pressure area presses to the bearing surface of low-pressure area, gear shaft and the flank of tooth all in a kind of state of discontinuity.If operating pressure is held
Continuous to rise, the unilateral stress of bearing can continue to increase, and when reaching certain pressure, bearing is damaged because stress is excessive, will cause at this time
Gear pump damages completely.
Summary of the invention
It is an object of the invention to overcome the above deficiencies in the existing technologies, and provide it is a kind of it is reasonable in design,
It can be used for low-pressure huge discharge occasion, the gear pump of high pressure small displacement occasion can be used for again, and give its working method.
The present invention solve the above problems used by technical solution be: a kind of gear pump, including the pump housing, front cover, rear cover and
One one-stage gear group；The front cover and rear cover are separately mounted to the both ends of the pump housing, are sealed for the both ends to the pump housing, institute
Stating one-stage gear group includes that the level-one master gear of a pair of of external toothing and primary auxiliary teeth wheel, the two are mounted in the pump housing；The pump housing
On open up oil inlet and oil outlet；It is characterized by: also including at least a secondary gear group and a transfer bar mechanism；Described two
Grade gear set includes the second level master gear and two-level subsidiary teeth wheel of a pair of of external toothing；The level-one master gear and the installation of second level master gear
In same rotation axis；
Form the first suction passage between the lateral tooth flank and pump housing inner wall of the one-stage gear group, first suction passage with into
Hydraulic fluid port communicates；The second suction passage, the one-stage gear are formed between the lateral tooth flank and pump housing inner wall of the secondary gear group
The first pressure oil passage, another lateral tooth flank and the pump housing of the secondary gear group are formed between another lateral tooth flank and pump housing inner wall of group
The second pressure oil passage is formed between inner wall, which communicates with oil outlet；
The transfer bar mechanism is movably arranged between one-stage gear group and secondary gear group, by moving left and right, makes the first oil suction
Channel and the second suction passage communicate, and the first pressure oil passage and the second pressure oil passage communicate, alternatively, making the first suction passage and
Two suction passages are not communicated with, and the first pressure oil passage and the second pressure oil passage are not communicated with, the second pressure oil passage and the second suction passage
It communicates.
Preferably, the overflow that the oil stream in the first pressure oil passage can be made to enter in the first suction passage is installed on the front cover
Valve.
Preferably, side is provided between the one-stage gear group and the side and pump housing inner wall of secondary gear group middle gear
Plate.
Preferably, the transfer bar mechanism includes the push rod and valve to link together；The spool of the push rod and valve is equal
For not isometrical cylindrical bar, the push rod is divided into three sections: the first from left section, the second from left section and three sections left, each section of diameter from left to right according to
Secondary reduction；The spool is divided into three sections: one section right, right two sections and three sections of the right side, left three sections and right one section link together, one section right
Equal with right three sections of diameters, right one section equal with the second from left section diameter, and right two sections equal with left three sections of diameters；
Preferably, the interior push rod channel being equipped with for placing transfer bar mechanism of the pump housing, the push rod channel and the first suction passage,
Second suction passage, the first pressure oil passage, the second pressure oil passage communicate, wherein the first suction passage and push rod channel have one
A river conjunction: No.1 outlet；There are two river conjunctions for second suction passage and push rod channel tool: No. two outlets and No. three outlets,
In No. three outlets it is corresponding with No.1 outlet；First pressure oil passage and push rod channel have a river conjunction: No. four outlets；
Second pressure oil passage and push rod channel tool are there are two river conjunction: No. five outlets and No. six outlets, and No. five outlets and No. six are out
Mouth two river conjunctions and No. four outlets are not corresponding；When the transfer bar mechanism is in initial bit, the first from left section and the second from left section are located at
Between No. five outlets and No. six outlets, right one section covers No. two outlets, and right two sections are located between No. three outlets and No.1 outlet,
At this point, the first suction passage and the second suction passage communicate, the first pressure oil passage and the second pressure oil passage are communicated, and the first pressure oil is logical
Road is not communicated with the second suction passage.
Preferably, the transfer bar mechanism further includes reset spring, one end of the reset spring and the first from left Duan Lian of push rod
It connects, the other end of reset spring connects a nut, which is mounted on the one end in push rod channel, and it is logical that the valve is mounted on push rod
The other end in road.
Preferably, the annular groove for placing sealing ring is offered in the first from left section of the push rod.
Preferably, it is sealed between the rotation axis and front cover by outside framework oil seal.
In order to solve the above technical problems, the present invention also provides another technical solutions: a kind of working method of gear pump,
It is characterized in that: including the first working condition and the second working condition:
First working condition: when operating on low voltage, transfer bar mechanism is located at No. five outlets and No. six in initial bit, the first from left section and the second from left section
Between outlet, right one section covers No. two outlets, and right two sections are located between No. three outlets and No.1 outlet, at this point, the first oil suction
Channel and the second suction passage communicate, and the first pressure oil passage and the second pressure oil passage communicate, the first pressure oil passage and the second oil suction
Channel is not communicated with, and the first suction passage and the second suction passage are simultaneously to one-stage gear group and secondary gear group fuel feeding, the first pressure
Oil stream in oily channel enters in the second pressure oil passage, flows out through oil outlet, is suitble to low-pressure huge discharge working condition at this time；
Second working condition: when operating pressure (oil outlet pressure) increases, oil outlet pressure reaches setting value, at this point,
Under the action of first pressure oil passage, the second pressure oil passage and No. five outlets, high pressure oil from No. five outlets outflow push push rods with
Spool moves to right, and then, the second from left section covers No. six outlets, and right one section covers No. three outlets and No.1 outlet, No. two outlet quilts
It opens, at this point, the first suction passage and the second suction passage are not communicated with, the first pressure oil passage and the second pressure oil passage are not communicated with,
Second pressure oil passage and the second suction passage communicate；One-stage gear group is by the first suction passage fuel feeding, in the first pressure oil passage
Oil stream enters in the second suction passage, i.e., from one-stage gear group to secondary gear group fuel feeding, extra oil is back to the from overflow valve
One suction passage, the back pressure of secondary gear group increase, the oil pressure in the first pressure oil passage remains unchanged, i.e. secondary gear group
Input pressure is constant, and the disengaging oil difference of secondary gear group is constant or reduces, and the shaft strength of secondary gear group will not continue to increase,
Oil outlet pressure reaches high pressure, reaches the working condition of high pressure small displacement at this time；When operating pressure is decreased to setting value,
Transfer bar mechanism resets, and reenters the first working condition.
Preferably, solenoid valve control also can be used in the transfer bar mechanism, and when pressure reaches setting value, electronic pressure gage is to electricity
Magnet valve issues signal, and solenoid valve pushes push rod to move to right, and realizes the second working condition, when pressure is down to setting value, solenoid valve makes to push away
Bar resets, and comes back to the first working condition.
Compared with prior art, the present invention having the following advantages that and effect:
1, the service pressure of this gear pump can reach 18Mpa-40 Mpa, can replace plunger pump in most occasions；
2, it realizes from one-stage gear group to secondary gear group fuel feeding, to make secondary gear group low pressure and high-pressure difference will not
It is lasting to increase, and then the bearing of secondary gear group and gear is protected not to damage, realize the working condition of high pressure；
3, the combination of three-level or multi-stage gear group can be carried out, to realize higher pressure.
Detailed description of the invention
Fig. 1 is the schematic cross-sectional view of the embodiment of the present invention.
Fig. 2 be in Fig. 1 F-F to schematic cross-sectional view.
Fig. 3 is the structural schematic diagram of push rod and spool in the embodiment of the present invention.
Description of symbols:
The pump housing 1；Front cover 2；Rear cover 3；Overflow valve 4；Side plate 5；
Push rod 6；The first from left section 61；The second from left section 62；It is three section 63 left；Annular groove 611；
Spool 7；It is one section 71 right；It is two section 72 right；It is three section 73 right；
Valve 8；Reset spring 9；Nut 10；Oil inlet 11；Oil outlet 12；Rotation axis 13；Outside framework oil seal 14；
Level-one master gear A1；Primary auxiliary teeth wheel A2；Second level master gear B1；Two-level subsidiary teeth wheel B2；
First suction passage C1；Second suction passage C2；First pressure oil passage D1；Second pressure oil passage D2；
No.1 exports E1；No. two outlet E2；No. three outlet E3；No. four outlet E4；No. five outlet E5；No. six outlet E6.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1 to Fig. 3.
The present embodiment is a kind of gear pump, including the pump housing 1, front cover 2,3, one-stage gear groups of rear cover, a secondary gear
Wheel group and a transfer bar mechanism.
In the present embodiment, front cover 2 and rear cover 3 are separately mounted to the both ends of the pump housing 1, carry out for the both ends to the pump housing 1 close
Envelope.One-stage gear group includes that the level-one master gear A1 of a pair of of external toothing and primary auxiliary teeth wheel A2, the two are mounted in the pump housing 1.Two
Grade gear set includes the second level master gear B1 and two-level subsidiary teeth wheel B2 of a pair of of external toothing；Level-one master gear A1 and second level master gear B1
It is mounted in same rotation axis 13, rotation axis 13 is close as being carried out between power input shaft, with front cover 2 by outside framework oil seal 14
Envelope.Oil inlet 11 and oil outlet 12 are offered on the pump housing 1.
In the present embodiment, the first suction passage C1 is formed between 1 inner wall of a lateral tooth flank and the pump housing of one-stage gear group, this
One suction passage C1 is communicated with oil inlet 11.It is logical that the second oil suction is formed between 1 inner wall of a lateral tooth flank and the pump housing of secondary gear group
Road C2, forms the first pressure oil passage D1 between 1 inner wall of another lateral tooth flank and the pump housing of one-stage gear group, secondary gear group it is another
The second pressure oil passage D2 is formed between 1 inner wall of lateral tooth flank and the pump housing, which communicates with oil outlet 12.Front cover 2
On the overflow valve 4 that the oil stream in the first pressure oil passage D1 can be made to enter in the first suction passage C1 is installed.One-stage gear group and two
Side plate 5 is provided between 1 inner wall of side and the pump housing of grade gear set middle gear.
In the present embodiment, transfer bar mechanism is movably arranged between one-stage gear group and secondary gear group, by moving left and right,
The first suction passage C1 and the second suction passage C2 are communicated, the first pressure oil passage D1 and the second pressure oil passage D2 are communicated, alternatively,
It is not communicated with the first suction passage C1 and the second suction passage C2, the first pressure oil passage D1 and the second pressure oil passage D2 are not communicated with,
Second pressure oil passage D2 and the second suction passage C2 are communicated.
In particular, transfer bar mechanism includes reset spring 9, and the push rod 6 and valve 8 that link together.Push rod 6 and valve
The spool 7 of door 8 is not isometrical cylindrical bar, as shown in figure 3, it is three sections that push rod 6, which divides: three sections of the first from left section 61, the second from left section 62 and a left side
63, each section of diameter is sequentially reduced from left to right；The annular groove 611 for placing sealing ring is offered in the first from left section 61.
It is three sections that spool 7, which divides: one section 71 right, right two section 72 and three section 73 of the right side, left three section 63 and right one section 71 is connected to one
It rises, right one section 71 equal with right three section of 73 diameter, and right one section 71 equal with 62 diameter of the second from left section, and right two section 72 straight with left three section 63
Diameter is equal.
The push rod channel for placing transfer bar mechanism, the push rod channel and the first suction passage C1, second are equipped in the pump housing 1
Suction passage C2, the first pressure oil passage D1, the second pressure oil passage D2 are communicated.
First suction passage C1 and push rod channel have a river conjunction: No.1 exports E1.
There are two river conjunctions: the E2 and No. three outlet E3 in No. two outlets for second suction passage C2 and push rod channel tool, wherein three
Number outlet E3 and No.1 outlet E1 it is corresponding.
First pressure oil passage D1 and push rod channel have a river conjunction: No. four outlet E4.
There are two river conjunctions: the E5 and No. six outlet E6 in No. five outlets for second pressure oil passage D2 and push rod channel tool, and No. five go out
E5 and No. six outlet E6 two river conjunction of mouth and No. four outlet E4 are not corresponding.
When transfer bar mechanism is in initial bit, the first from left section 61 and the second from left section 62 be located at No. five outlet E6 of outlet E5 and six it
Between, right one section 71 covers No. two outlet E2, and right two section 72 is located between No. three outlet E3 and No.1 outlet E1, at this point, first
Suction passage C1 and the second suction passage C2 are communicated, and the first pressure oil passage D1 and the second pressure oil passage D2 are communicated, and the first pressure oil is logical
Road D1 is not communicated with the second suction passage C2.
One end of reset spring 9 is connect with the first from left section 61 of push rod 6, and the other end of reset spring 9 connects a nut 10, should
Nut 10 is mounted on the one end in push rod channel, and valve 8 is mounted on the other end in push rod channel.
In the present embodiment, the working method of gear pump includes the first working condition and the second working condition:
First working condition: when operating on low voltage, transfer bar mechanism is located at No. five outlet E5 in initial bit, the first from left section 61 and the second from left section 62
Between No. six outlet E6, right one section 71 covers No. two outlet E2, and right two section 72 is located at No. three outlet E3 and No.1 outlet E1
Between, at this point, the first suction passage C1 and the second suction passage C2 are communicated, the first pressure oil passage D1 and the second pressure oil passage D2 phase
Logical, the first pressure oil passage D1 is not communicated with the second suction passage C2, and the first suction passage C1 and the second suction passage C2 give simultaneously
One-stage gear group and secondary gear group fuel feeding, the oil stream in the first pressure oil passage D1 enters in the second pressure oil passage D2, through oil outlet
12 outflows, are suitble to low-pressure huge discharge working condition at this time；
Second working condition: when operating pressure oil outlet pressure rise, oil outlet pressure reaches setting value, at this point,
Under the action of one pressure oil passage D1, the second pressure oil passage D2 and No. five outlet E5, high pressure oil is pushed from No. five outlet E5 outflows
Push rod 6 and spool 7 move to right, and then, the second from left section 62 covers No. six outlet E6, and right one section 71 covers No. three outlet E3 and No.1
E1 is exported, No. two outlet E2 are opened, at this point, the first suction passage C1 and the second suction passage C2 are not communicated with, the first pressure oil is logical
Road D1 and the second pressure oil passage D2 are not communicated with, and the second pressure oil passage D2 and the second suction passage C2 are communicated；One-stage gear group is by
One suction passage C1 fuel feeding, the oil stream in the first pressure oil passage D1 enter in the second suction passage C2, i.e., from one-stage gear group to two
Grade gear set fuel feeding, extra oil are back to the first suction passage C1 from overflow valve 4, and the back pressure of secondary gear group increases, and first
Oil pressure in pressure oil passage D1 remains unchanged, i.e. the input pressure of secondary gear group is constant, and the disengaging oil of secondary gear group is poor
Constant or reduction, the shaft strength of secondary gear group will not continue to increase, and oil outlet pressure reach high pressure, reach high pressure at this time
The working condition of power small displacement；When operating pressure is decreased to setting value, transfer bar mechanism resets, and reenters the first work shape
State.
In the working method of said gear pump, the movement of transfer bar mechanism relies on oil pressure, in addition, electromagnetism also can be used in transfer bar mechanism
Valve control, when pressure reaches setting value, electronic pressure gage issues signal to solenoid valve, and solenoid valve pushes push rod to move to right, and realizes
Second working condition, when pressure is down to setting value, solenoid valve resets push rod, comes back to the first working condition.
It is any ripe although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention
The technical staff for knowing this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this
The protection scope of invention.
Claims (9)
1. a kind of gear pump, including the pump housing (1), front cover (2), rear cover (3) and an one-stage gear group；The front cover (2) and after
Lid (3) is separately mounted to the both ends of the pump housing (1), and for being sealed to the both ends of the pump housing (1), the one-stage gear group includes one
To the level-one master gear (A1) and primary auxiliary teeth wheel (A2) of external toothing, the two is mounted in the pump housing (1)；It is opened on the pump housing (1)
If oil inlet (11) and oil outlet (12)；
It is characterized by: also including at least a secondary gear group and a transfer bar mechanism；The secondary gear group includes a pair
The second level master gear (B1) and two-level subsidiary teeth wheel (B2) of external toothing；The level-one master gear (A1) and second level master gear (B1) installation
On same rotation axis (13)；The first suction passage is formed between the lateral tooth flank and the pump housing (1) inner wall of the one-stage gear group
(C1), which communicates with oil inlet (11)；A lateral tooth flank and the pump housing (1) inner wall for the secondary gear group
Between formed the second suction passage (C2), form first between another lateral tooth flank and the pump housing (1) inner wall of the one-stage gear group
Pressure oil passage (D1) forms the second pressure oil passage (D2) between another lateral tooth flank and the pump housing (1) inner wall of the secondary gear group,
Second pressure oil passage (D2) is communicated with oil outlet (12)；
The transfer bar mechanism is movably arranged between one-stage gear group and secondary gear group, by moving left and right, makes the first oil suction
Channel (C1) and the second suction passage (C2) communicate, and the first pressure oil passage (D1) and the second pressure oil passage (D2) communicate, alternatively, making
First suction passage (C1) and the second suction passage (C2) are not communicated with, and the first pressure oil passage (D1) and the second pressure oil passage (D2) are no
It communicates, the second pressure oil passage (D2) and the second suction passage (C2) communicate.
2. gear pump according to claim 1, it is characterised in that: being equipped on the front cover (2) can make the first pressure oil logical
Oil stream in road (D1) enters the overflow valve (4) in the first suction passage (C1).
3. gear pump according to claim 1, it is characterised in that: the one-stage gear group and secondary gear group middle gear
Side plate (5) are provided between side and the pump housing (1) inner wall.
4. gear pump according to claim 1, it is characterised in that: the transfer bar mechanism includes the push rod to link together
(6) and valve (8)；The spool (7) of the push rod (6) and valve (8) is not isometrical cylindrical bar, and the push rod (6) is divided into three
Section: the first from left section (61), the second from left section (62) and left three sections (63), each section of diameter are sequentially reduced from left to right；The spool (7)
Be divided into three sections: right one section (71), right two sections (72) and right three sections (73), left three sections (63) and right one section (71) link together,
Right one section (71) and right three sections of (73) diameters are equal, and right one section (71) are equal with the second from left section (62) diameter, right two sections (72) and left
Three sections of (63) diameters are equal；
It is equipped with the push rod channel for placing transfer bar mechanism in the pump housing (1), the push rod channel and the first suction passage (C1),
Second suction passage (C2), the first pressure oil passage (D1), the second pressure oil passage (D2) communicate, wherein the first suction passage (C1)
Have a river conjunction with push rod channel: No.1 exports (E1)；There are two cross second suction passage (C2) with push rod channel tool
Mouthful: No. two outlets (E2) and No. three outlets (E3), wherein No. three outlets (E3) and No.1 outlet (E1) are corresponding；First pressure oil is logical
Road (D1) and push rod channel have a river conjunction: No. four outlets (E4)；Second pressure oil passage (D2) and push rod channel have two
A river conjunction: No. five outlets (E5) and No. six outlets (E6), No. five outlets (E5) and No. six outlet (E6) two river conjunctions with
No. four outlets (E4) do not correspond to；
When the transfer bar mechanism is in initial bit, the first from left section (61) and the second from left section (62) are located at No. five outlets (E5) and No. six outlets
(E6) between, right one section (71) cover No. two outlets (E2), and right two sections (72) are located at No. three outlets (E3) and No.1 outlet
(E1) between, at this point, the first suction passage (C1) and the second suction passage (C2) communicate, the first pressure oil passage (D1) and the second pressure
Oily channel (D2) communicates, and the first pressure oil passage (D1) is not communicated with the second suction passage (C2).
5. gear pump according to claim 4, it is characterised in that: the transfer bar mechanism further includes reset spring (9), described
One end of reset spring (9) is connect with the first from left section (61) of push rod (6), and the other end of reset spring (9) connects a nut (10),
The nut (10) is mounted on the one end in push rod channel, and the valve (8) is mounted on the other end in push rod channel.
6. gear pump according to claim 4, it is characterised in that: opened up in the first from left section (61) of the push rod (6) useful
In the annular groove (611) for placing sealing ring.
7. gear pump according to claim 1, it is characterised in that: pass through bone between the rotation axis (13) and front cover (2)
Frame oil sealing (14) is sealed.
8. a kind of working method of such as gear pump as claimed in any one of claims 1 to 7, it is characterised in that: including first
Working condition and the second working condition:
First working condition: when operating on low voltage, transfer bar mechanism is located at No. five and goes out in initial bit, the first from left section (61) and the second from left section (62)
Between mouth (E5) and No. six outlets (E6), right one section (71) cover No. two outlets (E2), and right two sections (72) are located at No. three outlets
(E3) between No.1 outlet (E1), at this point, the first suction passage (C1) and the second suction passage (C2) communicate, the first pressure oil is logical
Road (D1) and the second pressure oil passage (D2) communicate, and the first pressure oil passage (D1) is not communicated with the second suction passage (C2), and first inhales
Oily channel (C1) and the second suction passage (C2) are simultaneously to one-stage gear group and secondary gear group fuel feeding, the first pressure oil passage (D1)
Interior oil stream enters in the second pressure oil passage (D2), flows out through oil outlet (12), is suitble to low-pressure huge discharge working condition at this time；
Second working condition: when operating pressure (oil outlet pressure) increases, oil outlet pressure reaches setting value, at this point,
Under the action of first pressure oil passage (D1), the second pressure oil passage (D2) and No. five outlets (E5), high pressure oil is exported from No. five
(E5) outflow pushes push rod (6) and spool (7) to move to right, and then, the second from left section (62) covers No. six outlets (E6), right one section (71)
No. three outlets (E3) and No.1 outlet (E1) are covered, No. two outlets (E2) are opened, at this point, the first suction passage (C1) and the
Two suction passages (C2) are not communicated with, and the first pressure oil passage (D1) and the second pressure oil passage (D2) are not communicated with, the second pressure oil passage
(D2) it is communicated with the second suction passage (C2)；One-stage gear group is by the first suction passage (C1) fuel feeding, the first pressure oil passage (D1)
Interior oil stream enters in the second suction passage (C2), i.e., from one-stage gear group to secondary gear group fuel feeding, extra is oily from overflow valve
(4) it is back to the first suction passage (C1), the back pressure of secondary gear group increases, and the oil pressure in the first pressure oil passage (D1) is kept
Constant, i.e. the input pressure of secondary gear group is constant, and the disengaging oil difference of secondary gear group is constant or reduces, the axis of secondary gear group
Endurance will not continue to increase, and oil outlet pressure reaches high pressure, reaches the working condition of high pressure small displacement at this time；Work as work
When pressure is decreased to setting value, transfer bar mechanism resets, and reenters the first working condition.
9. the working method of gear pump according to claim 8, it is characterised in that: solenoid valve also can be used in the transfer bar mechanism
Control.
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Cited By (1)
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|---|---|---|---|---|
| CN110374865A (en) * | 2019-08-25 | 2019-10-25 | 符鹏 | A kind of gear pump with variable capacity |
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