CN114704460A - Micro-communication structure with symmetrically arranged unloading grooves for trapped oil of external gear pump - Google Patents

Micro-communication structure with symmetrically arranged unloading grooves for trapped oil of external gear pump Download PDF

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Publication number
CN114704460A
CN114704460A CN202210387174.2A CN202210387174A CN114704460A CN 114704460 A CN114704460 A CN 114704460A CN 202210387174 A CN202210387174 A CN 202210387174A CN 114704460 A CN114704460 A CN 114704460A
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oil
unloading
trapped
micro
grooves
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李玉龙
宋安然
刘萍
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Suqian College
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Suqian College
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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
    • 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
    • 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
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • 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
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/086—Carter

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Abstract

The invention discloses a micro-communication structure with symmetrically arranged unloading grooves for trapping oil of an external gear pump, which consists of two completely same unloading grooves at an oil suction side and unloading grooves at an oil discharge side, wherein the unloading grooves at the oil suction side and the unloading grooves at the oil discharge side are arranged on parts at two ends of a gear pair, the unloading grooves on the two parts are symmetrical about the middle section of the gear pair in the width direction, the unloading grooves at the oil suction side and the unloading grooves at the oil discharge side on the same part are symmetrical about the central plane of the gear pair, and the distance between the unloading grooves is (2-epsilon) pbcos α, wherein ε>1 is the degree of coincidence, generally ∈ 1.1 ~ 1.3, pbThe pitch of the base circle of the gear for the pump, and α is the meshing angle. The invention skillfully utilizes the oil absorption medium and the trapped oil by properly shortening the distance between the unloading grooves on the premise of not changing the original structure without the communicating unloading groovesThe oil medium and the oil discharge medium are locally connected in a micro mode, so that the average value of the output flow of the gear pump with low loss is used as a cost, and the effect of fully relieving trapped oil pressure fluctuation is achieved.

Description

Micro-communication structure with symmetrically arranged unloading grooves for trapped oil of external gear pump
Technical Field
The invention belongs to the technical field of external gear pumps, and particularly relates to a micro-communication structure with symmetrically arranged unloading grooves for trapping oil of an external gear pump.
Background
Oil trapping caused by double-gear meshing and the oil trapping phenomenon thereof are one of three defects of an external gear pump determined by the structure of the external gear pump, pressure impact caused by high oil trapping pressure and cavitation erosion caused by low oil trapping pressure are easily caused, and damages such as vibration, noise and the like are generated, so that the service life of the pump is greatly influenced. The arrangement and innovation of the unloading grooves are the main measures for relieving the oil trapping phenomenon and the damage thereof all the time, related technical inventions are many, such as CN111502986B, CN106762620B, CN103122853B, CN103437996B, CN103527470B and the like, but all the technical inventions belong to the technical scheme that the unloading area is increased by innovating the shape of the unloading grooves on the basis of following the classic principle that the oil suction side unloading grooves and the oil discharge side unloading grooves are not communicated and are symmetrically arranged, and the distance between the oil suction side unloading grooves and the oil discharge side unloading grooves (referred to as the unloading groove distance for short) is generally pbcos α, wherein pbThe pitch of the base circle of the gear for the pump and the length of a meshing line between meshing of the double teeth are also provided, and alpha is a meshing angle.
The unloading area is small, the unloading area can be increased through innovation of the shape of the unloading groove, the increasing effect is limited, and the oil trapping phenomenon is serious due to the fact that the rotating speed is slightly increased.
According to this classical principle, even if p is usedbThe distance between the unloading grooves of cos alpha is symmetrically arranged, and the actual distance between the unloading grooves is smaller than p due to the objective existence of the machining errors and the assembly errors of the unloading grooves, the gear pairbcos alpha forms the actual micro communication of the oil absorption side unloading groove and the oil discharge side unloading groove in the oil trapping change interval, and leads to the local micro connection of the oil absorption medium, the oil trapping medium and the oil discharge medium, and the local micro communication increases the unloading area and slightly relieves the oil trapping phenomenon to a certain extent, but also brings about the micro loss of the output flow of the gear pump.
Disclosure of Invention
Aiming at the problems to be solved in the background art, the invention aims to skillfully utilize the brought local micro-connection of the oil absorption medium, the trapped oil medium and the oil discharge medium by properly shortening the distance between the unloading grooves, and exchange the trapped oil pressure fluctuation for the purpose of fully relieving the trapped oil pressure fluctuation at the cost of the average value of the output flow of the gear pump with less loss.
In order to achieve the above object, the technical solution of the present invention is as follows:
the micro-communicating structure consists of two identical oil sucking side unloading grooves and oil discharging side unloading grooves, the oil sucking side unloading grooves and the oil discharging side unloading grooves are arranged on parts at two ends of a gear pair, the unloading grooves on the two end parts are symmetrical about the middle section of the gear pair in the width direction, the oil sucking side unloading grooves and the oil discharging side unloading grooves on the same part are symmetrical about the central plane of the gear pair, and the interval between the unloading grooves is (2-epsilon) pbcos α, wherein ε>1 is the degree of coincidence, generally ∈ 1.1 ~ 1.3, pbThe pitch of the base circle of the gear for the pump, and α is the meshing angle.
The parts are pump covers or floating side plates and are determined by the specific structure of the gear pump.
The distance between the unloading grooves is the distance between the unloading groove at the oil suction side and the unloading groove at the oil discharge side.
The oil suction side unloading groove and the oil discharge side unloading groove take a rectangular unloading groove as an example, but are not limited to the rectangular unloading groove, and can be unloading grooves in other various shapes.
When the double teeth of the gear pair are meshed, the sealed trapped working medium enclosed by the two end parts of the gear pair and the two end parts of the gear pair is trapped oil.
The variation period of the space volume of the closed trapped oil cavity on the double-tooth meshing line is [ -0.5 epsilon pb，(0.5ε-1)pb]。
The projection area of the space volume of the closed trapped oil cavity in the unloading groove is the unloading area which is divided into a micro-communication unloading area A at the oil suction sideIAnd the unloading area Ao is slightly communicated with the oil discharge side.
At [ -0.5 ε pb，(0.5ε-1)pb]In the trapped oil change interval, the unloading area can be obtained by synchronously measuring the end surface area of the unloading block at each time of rotating a 3D model of the gear pair by a step angle delta theta, wherein
Figure BDA0003594136130000021
Wherein N is the oil trapping change interval [ -0.5 ε pb，(0.5ε-1)pb]Z is the number of teeth; the gear pair 3D model can be made by current GC tool boxes under 3D software, such as UGNX software, for gears and gear pairs.
At [ -0.5 ε pb，(0.5ε-1)pb]In the trapped oil change interval, the change rate Q of the space volume of the trapped oil cavityT(x) Is composed of
QT(x)＝ωwpb(pb+2x) (2)
In the formula, when the double teeth of the gear pair are meshed, x is the length from a meshing point which enters the meshing to a node on a meshing line in the negative direction, omega is the rotation angular velocity of the gear pair, and w is the tooth width.
At [ -0.5 ε pb，(0.5ε-1)pb]In the trapped oil change interval, the oil absorption pressure p is obtained by an outflow formula of the thin-wall small holeIAnd trapped oil pressure pTBy the relief area A of the oil suction sideIExchange traffic QTIOil discharge pressure pOAnd trapped oil pressure pTExchange flow Q through the discharge-side relief area AoTOIs composed of
Figure BDA0003594136130000031
In the formula, QTI、QTOThe positive flow is in the sealed trapped oil cavity, and the negative flow is out of the sealed trapped oil cavity; 0.62 is the flow coefficient of the thin-walled aperture, p is the density of the medium, pT(x) Is the trapped oil pressure.
The trapped oil pressure pT(x) By instantaneous balancing of the flow in the closed trapped-oil chamber, i.e. by
QT(x)+QTI(x)+QTO(x)＝0 (4)
Thus obtaining the compound.
The output flow of the gear pump is
Figure BDA0003594136130000032
In the formula, raAnd r is the addendum circle radius and the pitch circle radius of the gear pair respectively.
Micro-communicating structures symmetrically arranged relative to the unloading grooves for trapped oil, wherein the distance between the unloading grooves is equal to p without the communicating structuresbBesides cos alpha, the other parts are completely the same as the micro-communication structure and the trapped oil pressure and output flow calculation under the micro-communication structure. Therefore, the improvement effect of micro-communication relative to trapped oil pressure fluctuation without communication is good, and the loss of output flow is small.
Compared with the prior art, the invention has the following beneficial effects:
according to the micro-communication structure with the symmetrically arranged unloading grooves for the trapped oil of the external gear pump, on the premise of not changing the original structure without the communication unloading grooves, the oil absorption medium, the trapped oil medium and the oil discharge medium are locally micro-connected by skillfully utilizing the proper shortening of the distance between the unloading grooves, and the sufficient effect of relieving the trapped oil pressure fluctuation is obtained at the cost of low loss of the average value of the output flow of the gear pump.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a gear pair and a relief groove.
FIG. 2 shows the arrangement of a non-communicating relief groove and a micro-communicating relief groove.
FIG. 3 is an example of the relief area results for the no-communication and micro-communication settings.
FIG. 4 shows an example of the trapping pressure calculation when no communication and micro-communication are provided.
FIG. 5 is an example of an output flow calculation with no communication and micro-communication settings.
Wherein: a. the0No communicating relief area, AIThe oil suction side is slightly communicated with the unloading area AOThe oil discharge side is slightly communicated with an unloading area pTTrapped oil pressure, Q, output flow, x, when meshing for double teeth of gear pairThe negative direction length from the mesh point to the node point on the line back into mesh.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figures 1-5, the micro-communication structure with the unloading grooves for the trapped oil of the external gear pump is symmetrically arranged and consists of two identical unloading grooves at the oil suction side and the oil discharge side, and the distance between the unloading grooves is (2-epsilon) pbcos α, wherein ε>1 is the degree of coincidence, generally ∈ 1.1 ~ 1.3, pbThe pitch of the base circle of the pump gear is α, which is the meshing angle. .
The oil suction side unloading grooves and the oil discharge side unloading grooves are arranged on parts at two ends of the gear pair, the unloading grooves on the two end parts are symmetrical about the middle section of the gear pair in the width direction, and the oil suction side unloading grooves and the oil discharge side unloading grooves on the same part are symmetrical about the central plane of the gear pair.
The parts are pump covers or floating side plates and are determined by the specific structure of the gear pump.
The unloading groove is a rectangular unloading groove, but is not limited to a rectangular unloading groove, and can be unloading grooves in other various shapes.
The trapped oil is working medium in a sealed trapped oil cavity which is formed by enclosing the trapped oil and two end parts of the gear pair together when the gear pair is meshed with the gears in a double-tooth mode.
The variation period of the space volume of the closed trapped oil cavity on the double-tooth meshing line is [ -0.5 epsilon pb，(0.5ε-1)pb]。
The unloading area is the projection area of the space volume of the closed trapped oil cavity in the unloading groove and is divided into a micro-communication unloading area A at the oil suction sideIIs slightly communicated with the oil discharge side to unload the area AO。
At [ -0.5 ε pb，(0.5ε-1)pb]In the oil trapping change interval, the unloading area can be obtained by synchronously measuring the end surface area of the unloading block when the 3D model of the gear pair rotates by a step angle delta theta every time, wherein
Figure BDA0003594136130000051
Wherein N is the oil trapping change interval [ -0.5 ε pb，(0.5ε-1)pb]Z is the number of teeth; the gear pair 3D model can be made by current GC tool boxes under 3D software, such as UGNX software, for gears and gear pairs.
At [ -0.5 ε pb，(0.5ε-1)pb]In the trapped oil change interval, the change rate Q of the space volume of the trapped oil cavityT(x) Is composed of
QT(x)＝ωwpb(pb+2x) (2)
In the formula, when the double teeth of the gear pair are meshed, x is the length from a meshing point which enters the meshing to a node on a meshing line in the negative direction, omega is the rotation angular velocity of the gear pair, and w is the tooth width.
At [ -0.5 ε pb，(0.5ε-1)pb]In the trapped oil change interval, the oil absorption pressure p is obtained by an outflow formula of the thin-wall small holeIAnd trapped oil pressure pTBy the relief area A of the oil suction sideIExchange traffic QTIOil discharge pressure pOAnd trapped oil pressure pTBy discharge side relief area AOExchange traffic QTOIs composed of
Figure BDA0003594136130000052
In the formula, QTI、QTOThe flow rate of the oil flowing into the sealed trapped oil cavity is positive, and the flow rate of the oil flowing out of the sealed trapped oil cavity is negative; 0.62 is the flow coefficient of the thin-walled aperture, p is the density of the medium, pT(x) Is the trapped oil pressure.
The trapped oil pressure pT(x) By instantaneous balancing of the flow in the closed trapped-oil chamber, i.e. by
QT(x)+QTI(x)+QTO(x)(x)＝0 (4)
Thus obtaining the product.
The output flow of the gear pump is
Figure BDA0003594136130000061
In the formula, raAnd r is the addendum circle radius and the pitch circle radius of the gear pair respectively.
The micro-communicating structure is symmetrically arranged relative to the unloading grooves for trapped oil, and the gap between the unloading grooves is equal to p in the non-communicating structurebExcept cos alpha, the other parts are completely the same as the micro-communication structure and the trapped oil pressure and output flow calculation below the micro-communication structure.
The gear module is 3, the tooth number is 9, the contact ratio is 1.2440, the modification coefficient is 0.1195, the addendum coefficient is 1, the head clearance coefficient is 0.25, the pressure angle is 20 degrees, the tooth width is 20mm, the rotating speed is 1500RPM (rotating speed), namely the angular speed omega is 157.0796rad/s, the oil discharge pressure is 2MPa, the oil absorption pressure is 0.1MPa, and the medium density is 870Kg/m3The closer the position of the rear meshing point is to the position of the node, the larger the multiplication number of the micro-communication unloading area relative to the non-communication unloading area is, and the x is equal to-0.5 epsilon pb1.5 times at the starting position until x ═ 0.5pbAt infinity, outstanding resolution x ═ 0.5pbThe problem that the non-communication unloading area is 0 is solved, the trapped oil pressure fluctuation rate of the non-communication structure is that the trapped oil pressure amplitude/(oil discharge pressure-oil suction pressure) is approximately equal to 4, the trapped oil pressure fluctuation is large, the trapped oil phenomenon is serious, the trapped oil pressure fluctuation rate of the micro-communication structure is approximately equal to 1, the trapped oil pressure fluctuation is basically controlled between the oil discharge pressure and the oil suction pressure, the trapped oil phenomenon hardly occurs, and only about 4.5% of the output flow average value is lost.
On the premise of not changing the original structure without the communicated unloading groove, the oil absorption medium, the trapped oil medium and the oil discharge medium are ingeniously utilized by properly shortening the distance between the unloading grooves, and the oil trapping pressure fluctuation is fully relieved at the cost of low loss of the average output flow.

Claims (10)

1. The utility model provides an external gear pump is stranded little intercommunication structure of ageing-resistant groove symmetrical arrangement for oil, its characterized in that: the oil suction side unloading groove and the oil discharge side unloading groove on the same part are symmetrical about the middle section of the gear pair in the width direction, and the interval of the unloading grooves is (2-epsilon) pbcos alpha, where epsilon > 1 is the degree of coincidence, epsilon is 1.1-1.3, pbThe pitch of the base circle of the gear for the pump, and α is the meshing angle.
2. The micro-communicating structure in which unloading grooves for trapping oil in an external gear pump are symmetrically arranged according to claim 1, characterized in that: the parts are pump covers or floating side plates and are determined by the specific structure of the gear pump.
3. The micro-communicating structure in which unloading grooves for trapping oil in an external gear pump are symmetrically arranged according to claim 1, characterized in that: the oil suction side unloading groove and the oil discharge side unloading groove take a rectangular unloading groove as an example, but are not limited to the rectangular unloading groove.
4. The micro-communicating structure in which unloading grooves for trapping oil in an external gear pump are symmetrically arranged according to claim 1, characterized in that: when the gear pair is meshed with the two gears, the working medium in the sealed trapped oil cavity enclosed by the two end parts of the gear pair together is trapped oil, and the change period of the space volume of the sealed trapped oil cavity on the meshing line of the two gears is [ -0.5 Epsilon pb，(0.5ε-1)pb]。
5. The micro-communicating structure in which unloading grooves for trapping oil in an external gear pump are symmetrically arranged according to claim 4, characterized in that: the projection area of the space volume of the closed trapped oil cavity in the unloading groove is the unloading area which is divided into a micro-communication unloading area A at the oil suction sideIIs slightly communicated with the oil discharge side to unload the area AO。
6. The micro-communicating structure in which unloading grooves for trapping oil in an external gear pump are symmetrically arranged according to claim 4, characterized in that: at [ -0.5 ε pb，(0.5ε-1)pb]In the trapped oil change interval, the unloading area can be obtained by synchronously measuring the end surface area of the unloading block at every rotation of a 3D model of the gear pair by a step angle delta theta, wherein
Figure FDA0003594136120000011
Wherein N is the oil trapping change interval [ -0.5 ε pb，(0.5ε-1)pb]Z is the number of teeth; the gear pair 3D model can be made by current GC tool boxes under 3D software, such as UGNX software, for gears and gear pairs.
7. The micro-communicating structure in which unloading grooves for trapping oil in an external gear pump are symmetrically arranged according to claim 4, characterized in that: at [ -0.5 ε pb，(0.5ε-1)pb]In the trapped oil change interval, the change rate Q of the space volume of the trapped oil cavityT(x) Is composed of
QT(x)＝ωwpb(pb+2x) (2)
In the formula, when the double teeth of the gear pair are meshed, x is the length from a meshing point which enters the meshing to a node on a meshing line in the negative direction, omega is the rotation angular velocity of the gear pair, and w is the tooth width.
8. The micro-communicating structure in which unloading grooves for trapping oil in an external gear pump are symmetrically arranged according to claim 4, characterized in that: at [ -0.5 ε pb，(0.5ε-1)pb]In the trapped oil change interval, the oil absorption pressure p is obtained by an outflow formula of the thin-wall small holeIAnd trapped oil pressure pTBy the unloading area A of the oil suction sideIExchange traffic QTIOil discharge pressure p0And trapped oil pressure pTBy discharging oilSide dump area AOExchange traffic QT0Is composed of
Figure FDA0003594136120000021
In the formula, QTI、QT0The positive flow is in the sealed trapped oil cavity, and the negative flow is out of the sealed trapped oil cavity; 0.62 is the flow coefficient of the thin-walled aperture, p is the density of the medium, pT(x) Is the trapped oil pressure.
9. The micro-communicating structure in which unloading grooves for trapping oil in an external gear pump are symmetrically arranged according to claim 8, characterized in that: the trapped oil pressure pT(x) By instantaneous balancing of the flow in the closed trapped-oil chamber, i.e. by
QT(x)+QTI(x)+QTO(x)＝0 (4)
Thus obtaining the product.
10. The micro-communicating structure in which unloading grooves for trapping oil in an external gear pump are symmetrically arranged according to claim 1, characterized in that: the output flow of the gear pump is
Figure FDA0003594136120000022
In the formula, raAnd r is the addendum circle radius and the pitch circle radius of the gear pair respectively.
CN202210387174.2A 2022-04-13 2022-04-13 Micro-communication structure with symmetrically arranged unloading grooves for trapped oil of external gear pump Pending CN114704460A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116127639A (en) * 2023-02-01 2023-05-16 宿迁学院 Unified model method for establishing theoretical displacement of gear pump under different side gaps and unloading grooves

Citations (6)

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Publication number Priority date Publication date Assignee Title
JP2009030516A (en) * 2007-07-26 2009-02-12 Toyota Industries Corp Gear pump
CN203822625U (en) * 2014-03-28 2014-09-10 四川长江液压件有限责任公司 Gear pump side plate without trapping oil
CN204984872U (en) * 2015-08-26 2016-01-20 浙江尔格科技股份有限公司 Gear pump
CN109268258A (en) * 2018-10-09 2019-01-25 宿迁学院 A kind of ∥ shape compensating groove of external gear rotary pump
CN209261809U (en) * 2018-10-09 2019-08-16 宿迁学院 A kind of combination unloading-structure for pocketed oil
CN111502986A (en) * 2020-04-26 2020-08-07 宿迁学院 Trapped oil unloading structure for aerospace gear micropump under ultralow-viscosity medium and design method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009030516A (en) * 2007-07-26 2009-02-12 Toyota Industries Corp Gear pump
CN203822625U (en) * 2014-03-28 2014-09-10 四川长江液压件有限责任公司 Gear pump side plate without trapping oil
CN204984872U (en) * 2015-08-26 2016-01-20 浙江尔格科技股份有限公司 Gear pump
CN109268258A (en) * 2018-10-09 2019-01-25 宿迁学院 A kind of ∥ shape compensating groove of external gear rotary pump
CN209261809U (en) * 2018-10-09 2019-08-16 宿迁学院 A kind of combination unloading-structure for pocketed oil
CN111502986A (en) * 2020-04-26 2020-08-07 宿迁学院 Trapped oil unloading structure for aerospace gear micropump under ultralow-viscosity medium and design method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116127639A (en) * 2023-02-01 2023-05-16 宿迁学院 Unified model method for establishing theoretical displacement of gear pump under different side gaps and unloading grooves
CN116127639B (en) * 2023-02-01 2024-02-13 宿迁学院 Unified model method for establishing theoretical displacement of gear pump under different side gaps and unloading grooves

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