CN204371665U

CN204371665U - A kind of novel fluorine liner magnetic gear pump

Info

Publication number: CN204371665U
Application number: CN201420863188.8U
Authority: CN
Inventors: 何祥军
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-12-31
Filing date: 2014-12-31
Publication date: 2015-06-03
Anticipated expiration: 2024-12-31

Abstract

The utility model relates to a kind of liquid carrying the noble metals such as the very unmanageable chemical substance such as various chemical mediator, inorganic acid, alkali and salt and hydrochloric acid, sulfuric acid, nitric acid, chromic acid, hydrofluoric acid, ferric trichloride, sodium hypochlorite and sodium hydroxide, and need the pumping of high-purity medium of isolating metal material, have band fluorine material liner, with magneto drive, the corrosion-resistant high voltage bearing one of acid resistant alkali novel fluorine liner magnetic gear pump.Machinery is fixed, chemical bonding and precision machining and liner be in stainless steel pump case all to adopt the high quality fluorine liner polymer of mold pressing to carry out by design medium contact parts, the magneto drive of fluorine liner is adopted to connect the driving of pump and motor, and innovative design structure and improve processing technology and reasonable selection metal and nonmetal combined material, solve deficiency or the vacancy of current technology, really accomplish zero leakage pulsating movement free, be the ideal chose of process corrosivity special media, meet effective application in the fields such as chemical industry.

Description

A kind of novel fluorine liner magnetic gear pump

Technical field

The utility model relates to a kind of pump, in particular to a kind of liquid carrying the noble metals such as the very unmanageable chemical substance such as various chemical mediator, inorganic acid, alkali and salt and hydrochloric acid, sulfuric acid, nitric acid, chromic acid, hydrofluoric acid, ferric trichloride, sodium hypochlorite and sodium hydroxide, and need the pumping of high-purity medium of isolating metal material, have that band fluorine material is liner, acid resistant alkali corrosion-resistant high voltage bearing one novel fluorine liner magnetic gear pump pulseless with the zero leakage of magneto drive.

Background technique

Existing gear pump is made up of metal material mostly, when the very unmanageable chemical mediator of needs pumping, as inorganic acid, alkali and salt, with the liquid of the noble metals such as hydrochloric acid, sulfuric acid, nitric acid, chromic acid, hydrofluoric acid, ferric trichloride, sodium hypochlorite and sodium hydroxide, and when needing the high-purity medium of isolating metal material, just cannot effectively carry or basic just helpless, the wearing and tearing of overcurrent metal parts are severe especially, and metal separation sleeve easily produces heat and causes vortex phenomenon; In addition, existing minority fluorine liner magnetic drive pump is magnetic force driven centrifugal pump mostly, centrifugal pump cannot meet low discharge and high pressure usually, or metering, circulation under certain pressure reduction and conveying is thin and viscous liquid, let alone unmanageable chemical mediator and noble metal liquid and high-purity medium will be carried, ubiquity delivery precision is low, application area is little, spoilage is high, weares and teares very severe, and life-span extremely short grade is difficult to the difficult problem that cannot effectively solve.

Existing gear pump mostly seals mode and motor straight by the main shaft of pump by machine and fetches in succession and realize driving, by gear by motor the mechanical energy that exports be converted to hydraulic energy, because main shaft directly contacts the liquid in pump transmission, inevitably leakage is produced between shaft seal, particularly there are acid-alkali salt poisonous and harmful adventurous and noble metal liquid and highly purified chemical mediator, will cause the destruction to environment, more serious meeting causes the injury of personnel; Secondly, the centering of gear pump and motor shaft is difficult to ensure, will cause gear, pump shaft and bearing can be subject to unbalanced pressure, cause radial load larger, limit the raising of its pressure, therefore cause working pressure lower, liquid stream is not steady, pulses larger, interface or pipeline etc. is made to produce vibrations, noise is large especially, and equipment is easy to damage, and directly has influence on the normal service life of pump.

Existing gear pump is mostly gear oil pump, only carry the liquid of the oils band selflubricating of low-pressure low-temperature (as about 70 DEG C) reluctantly, medium for high pressure-temperature (as 19bar, pressure reduction 7bar) and high viscosity (as 5000cP) or pole low viscosity (as 0.3cP) is just difficult to normally delivered; In addition, due to the simple of current design and processing and appropriate combined material can not be selected, for having acid-alkali salt poisonous and harmful adventurous and noble metal liquid and various harsher chemical mediator, substantially cannot correctly effectively carry; On the other hand, because design processing and material etc. are all many-sided not enough, its using scope is limited to very much, its service precision, metering level, cycle efficiency, transmission performance, installation and maintenance are all difficult to meet the requirement of producing at present, and the wearing and tearing of pump and gear are very severe, and maintenance difficulty is large, user cost is high, the efficiency of pump is low, and thus pump is very short for working life, can not get extensively effective application.

Model utility content

The purpose of this utility model is to solve the deficiencies in the prior art, the utility model provides a kind of novel fluorine liner magnetic gear pump, machinery is fixed, chemical bonding and precision machining and liner be in stainless steel pump case all to adopt the high quality fluorine liner polymer of mold pressing to carry out by design medium contact parts, the magneto drive of fluorine liner is adopted to connect the driving of pump and motor, and innovative design structure and improve processing technology and reasonable selection metal and nonmetal combined material, the technical solution of the utility model is as follows.

A kind of novel fluorine liner magnetic gear pump, it is characterized in that: pump main body is formed by connecting with four or eight bolts (17) by fore shell (11), mesochite (12) and back cover (13) and four locating studs (14), a kind of pump that pump main body is connected with nut (23) with pump-foot (30) bolt (21), pad (22) and forms, pump main body adopts stainless steel high-quality material to carry out precision machining manufacture and forms; Wherein, mold pressing fluorine liner (61A) is lined with in fore shell (11), mold pressing fluorine liner (62B) is lined with in the import and export all that mesochite (12) comprises both sides, fluorine liner (63C) is lined with in back cover (13), inner magnet (25) is encapsulated by fluorine liner (64D) and forms, be lined with fluorine liner (65E) in separation sleeve (26), all can not contact with the metallic material of pump main body when ensure that medium transport.

Inner magnet key (07) is inserted on main shaft (01), inner magnet (25) is contained on main shaft (01) by the direction aiming at inner magnet key (07), and pin inner magnet (25) with inner magnet jump ring (08), the O type circle (18) of separation sleeve (26) is loaded in the O type circle groove of fore shell (11), by six screws (24), separation sleeve (26) and fore shell (11) are integrally connected; Fore shell (11) and base (30) are linked together by bolt (21), pad (22) and nut (23); The outer magnet (27) connected to form by bolt (20) is fixedly connected with by screw (29) with motor (40) by its Hub port (28), and pump-foot (30) same to motor (40) connects to form one by bolt (31).

Separation sleeve (26) stainless steel or alloy material can be selected and in be lined with fluorine liner (65E), inner magnet (25) can be selected stainless steel and neodymium iron boron or samarium-cobalt magnet and be encapsulated by fluorine liner (64D) and form, outer magnet (27) can select carbon steel or stainless steel and neodymium iron boron or samarium-cobalt magnet organic assembling to form, there is High Temperature High Pressure and high magnetic force height moment of torsion feature, guarantee zero leakage pulsating movement free, separation sleeve (26), inner magnet (25) and outer magnet (27) and fluorine liner are all provided with multiple specification varied in size, the moment of torsion that varies in size can be provided and be provided with the multiple connecting shaft hole varied in size, multiple series can be formed with multiple motor (40) or organic docking of link.

Insert two axle sleeve pins (15) respectively in the axle sleeve pin-and-hole of fore shell (11) and back cover (13), insert two axle sleeves (09) respectively in the axle sleeve hole of fore shell (11) and back cover (13), axle sleeve trough aligned axle sleeve pin (15) is also fixed respectively, back cover (13) kept flat and two locating studs (14) is inserted in the pin-and-hole of back cover (13), O type circle (16) being loaded in the O type circle groove of back cover (13), by back cover (13) in mesochite (12) connection, two locating studs (14) are located with mesochite (12) and back cover (13) and are docked, two pieces of wearing plates (10) are loaded in mesochite (12) in its gas pressure relief slot direction upwards, again master gear (03) loading main shaft (01) is gone up and the assemblying body that partnered by gear key (05) and jump ring (06), with to load from gear (04) from axle (02) and to be partnered assemblying body by gear key (05) and jump ring (06), it is inner and engage each other that the two pairs of assemblying bodys are arranged on mesochite (12) respectively, wherein the assemblying body of master gear (03) and main shaft (01) is positioned on the central axis of pump main body, again two pieces of wearing plates (10) to be loaded in the downward direction of its gas pressure relief slot in mesochite (12) and to be positioned at master gear (03) and above gear (04), two locating studs (14) are inserted in the pin-and-hole of mesochite (12), O type circle (16) is loaded in the O type circle groove of fore shell (11), locate by mesochite (12) in fore shell (11) connection and with its two locating studs (14) and dock, main shaft (01) and to pierce into axle sleeve (09) respectively from axle (02), fore shell (11), mesochite (12) and back cover (13) are fitted together and is formed by connecting by four or eight bolts (17) and be integrated.

Main shaft (01) and from axle (02) and master gear (03) be provided with multiple specification that varies in size from gear (04), wearing plate (10), axle sleeve (09) are all provided with multiple specification that varies in size, pump fore shell (11), mesochite (12) and back cover (13) can be provided with multiple specification that varies in size, and can synthesize multiple specification series by organic matched group between them; All non-metallic material is selected with the flow passage components of the pump inside of medium contact, comprise PEEK, Teflon, Ryton, Kynar, SiC, C60 or the high-quality non-metallic material of ceramic band selflubricating, there is corrosion-resistant, acid resistant alkali, wear-resistant and can carry the feature of Specialty Chemical medium, the using scope of gear pump is expanded to the Application in Chemical Engineering that viscosity is low to moderate 0.3cP, and significant prolongation working life of pump, even if can normally use too when ultra-low quantity of flow.

As shown from the above technical solution, the advantage of fluorine liner magnetic gear pump of the present utility model is obvious: design medium contact parts all adopt the high quality fluorine liner polymer of mold pressing to carry out machinery and fix, chemical bonding and precision machining and liner are in stainless steel pump case, what so both have metal pump itself holds high pressure ability, turn improve the intensity needed for pumping and durability, avoid the thermal expansion problem that hot extrusion is relevant, ensure that original chemical characteristics of conveying liquid itself, meet the metering under low discharge and high pressure and certain pressure reduction, circulate and carry application that is thin and viscous liquid, be effective in the very unmanageable chemical mediator of conveying especially, as inorganic acid, alkali and salt, and hydrochloric acid, sulfuric acid, nitric acid, chromic acid, hydrofluoric acid, ferric trichloride, the liquid of the noble metal such as sodium hypochlorite and sodium hydroxide, and need the high-purity medium of isolating metal material, the process liquid of rigors and the optimal selection of aggressive chemistry medium.

Compare with existing technology, the Be very effective of fluorine liner magnetic gear pump of the present utility model: adopt the magneto drive of fluorine liner to connect the driving of pump and motor, stainless steel with fluorine liner or alloy material separation sleeve completely eliminate eddy current, ensure that pulsating movement free is steadily carried, magneto drive moment of torsion reaches 1 ~ 75Nm, due to separation sleeve by completely isolated for liquid be a sealing state, ensure that the zero leakage advantage in transmission, achieve and seal completely, protect environment, improve efficiency, due to without dynamic seal (packing), without rapid wear change part, therefore without the need to frequent maintenance, in addition, magneto drive is the driving adopting outer tape to move interior magnetic, ensure that absolute the connecting from centering of Pump and Electromotor, eliminate the radial load misaligning and cause, just in case when there is overload, inner magnet slippage relative to outer magnet, play effective overload protective function, meet oil, chemical industry, adhesive, pharmacy, food, beverage, tobacco, papermaking, cosmetics, metallurgical, testing apparatus, the conveying of chemical product etc., metering, circulation, many-sided application such as injection and lifting, particularly conveying has the optimal selection of the adventurous and noble metal of acid-alkali salt poisonous and harmful or high-purity liquid.

Compare with existing technology, the advantage of fluorine liner magnetic gear pump of the present utility model is given prominence to: by innovative design structure with improve processing technology and reasonable selection metal and nonmetal combined material, according to the different qualities of pump inside and contact liq, the efficient combination that the most rational metal and nonmetal multiple material are arranged in pairs or groups can be matched, comprise stainless steel and alloy material, and PEEK or Teflon or C60 or SiC or the nonmetallic material such as Ryton and pottery, thus guarantee that pump can meet the operating mode of High Temperature High Pressure and various viscosity, maximum outlet pressure 19bar, Maximum differential pressure 7bar, peak rate of flow 57L/M, maximum suction lift (dry suction) 2.1M, maximum (top) speed 1750RPM, be suitable for viscosity 0.3 ~ 100000cPS, temperature reaches 94 DEG C, repeatability ± 0.5%, DIN or ANSI flange-interface, carry efficiently having the adventurous and noble metal liquid of acid-alkali salt poisonous and harmful and various harsher chemical mediator, greatly improve its service precision, metering level, cycle efficiency, transmission performance, the aspects such as installation and maintenance all achieve goodish advantage, thus make this gear pump obtain promotion and application widely, meet vast application demand.

Accompanying drawing explanation

Fig. 1 is STRUCTURE DECOMPOSITION schematic diagram of the present utility model.

Appointment Fig. 1 is Figure of abstract, wherein: main shaft (01), from axle (02), master gear (03), from gear (04), gear key (05), jump ring (06), inner magnet key (07), inner magnet jump ring (08), axle sleeve (09), wearing plate (10), fore shell (11), mesochite (12), back cover (13), locating stud (14), axle sleeve pin (15), O type circle (16), bolt (17), O type circle (18), bolt (20), bolt (21), pad (22), nut (23), screw (24), inner magnet (25), separation sleeve (26), outer magnet (27), Hub port (28), screw (29), base (30), bolt (31), motor (40), fore shell fluorine liner (61A), mesochite fluorine liner (62B), back cover fluorine liner (63C), inner magnet fluorine liner (64D), separation sleeve fluorine liner (65E).

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment; explanation is further described to the technological scheme of the utility model embodiment; obviously; described embodiment is only section Example of the present utility model; instead of whole embodiments; based on embodiment of the present utility model; those skilled in that art are only other embodiments all obtained under simple prerequisite of replacing or change not making breakthrough especially and creative work, all belong within protection domain of the present utility model.

The utility model embodiment relates to a kind of novel fluorine liner magnetic gear pump, Fig. 1 design medium contact parts all adopt the high quality fluorine liner polymer of mold pressing carry out machinery fix, chemical bonding and precision machining and liner are in stainless steel pump case, what so both have metal pump itself holds high pressure ability, turn improve the intensity needed for pumping and durability, avoid the thermal expansion problem that hot extrusion is relevant, ensure that original chemical characteristics of conveying liquid itself, meet the metering under low discharge and high pressure and certain pressure reduction, circulate and carry application that is thin and viscous liquid, be effective in the very unmanageable chemical mediator of conveying especially, as inorganic acid, alkali and salt, and hydrochloric acid, sulfuric acid, nitric acid, chromic acid, hydrofluoric acid, ferric trichloride, the liquid of the noble metal such as sodium hypochlorite and sodium hydroxide, and need the high-purity medium of isolating metal material, the process liquid of rigors and the optimal selection of aggressive chemistry medium, embodiment is as follows.

The utility model embodiment relates to a kind of novel fluorine liner magnetic gear pump, Fig. 1 adopts the magneto drive of fluorine liner to connect the driving of pump and motor, stainless steel with fluorine liner or alloy material separation sleeve completely eliminate eddy current, ensure that pulsating movement free is steadily carried, magneto drive moment of torsion reaches 1 ~ 75Nm, due to separation sleeve by completely isolated for liquid be a sealing state, ensure that the zero leakage advantage in transmission, achieve and seal completely, protect environment, improve efficiency, due to without dynamic seal (packing), without rapid wear change part, therefore without the need to frequent maintenance, in addition, magneto drive is the driving adopting outer tape to move interior magnetic, ensure that absolute the connecting from centering of Pump and Electromotor, eliminate the radial load misaligning and cause, just in case when there is overload, inner magnet slippage relative to outer magnet, play effective overload protective function, meet oil, chemical industry, adhesive, pharmacy, food, beverage, tobacco, papermaking, cosmetics, metallurgical, testing apparatus, the conveying of chemical product etc., metering, circulation, many-sided application such as injection and lifting, particularly conveying has the optimal selection of the adventurous and noble metal of acid-alkali salt poisonous and harmful or high-purity liquid, embodiment is as follows.

A kind of novel fluorine liner magnetic gear pump, it is characterized in that: inner magnet key (07) is inserted on main shaft (01), inner magnet (25) is contained on main shaft (01) by the direction aiming at inner magnet key (07), and pin inner magnet (25) with inner magnet jump ring (08), the O type circle (18) of separation sleeve (26) is loaded in the O type circle groove of fore shell (11), by six screws (24), separation sleeve (26) and fore shell (11) are integrally connected; Fore shell (11) and base (30) are linked together by bolt (21), pad (22) and nut (23); The outer magnet (27) connected to form by bolt (20) is fixedly connected with by screw (29) with motor (40) by its Hub port (28), and pump-foot (30) same to motor (40) connects to form one by bolt (31).

The utility model embodiment relates to a kind of novel fluorine liner magnetic gear pump, Fig. 1 is by innovative design structure and improve processing technology and reasonable selection metal and nonmetal combined material, according to the different qualities of pump inside and contact liq, the efficient combination that the most rational metal and nonmetal multiple material are arranged in pairs or groups can be matched, comprise stainless steel and alloy material, and PEEK or Teflon or C60 or SiC or the nonmetallic material such as Ryton and pottery, thus guarantee that pump can meet the operating mode of High Temperature High Pressure and various viscosity, maximum outlet pressure 19bar, Maximum differential pressure 7bar, peak rate of flow 57L/M, maximum suction lift (dry suction) 2.1M, maximum (top) speed 1750RPM, be suitable for viscosity 0.3 ~ 100000cPS, temperature reaches 94 DEG C, repeatability ± 0.5%, DIN or ANSI flange-interface, carry efficiently having the adventurous and noble metal liquid of acid-alkali salt poisonous and harmful and various harsher chemical mediator, greatly improve its service precision, metering level, cycle efficiency, transmission performance, the aspects such as installation and maintenance all achieve goodish advantage, thus make this gear pump obtain promotion and application widely, meet vast application demand, embodiment is as follows.

A kind of novel fluorine liner magnetic gear pump, it is characterized in that: insert two axle sleeve pins (15) respectively in the axle sleeve pin-and-hole of fore shell (11) and back cover (13), insert two axle sleeves (09) respectively in the axle sleeve hole of fore shell (11) and back cover (13), axle sleeve trough aligned axle sleeve pin (15) is also fixed respectively, back cover (13) kept flat and two locating studs (14) is inserted in the pin-and-hole of back cover (13), O type circle (16) being loaded in the O type circle groove of back cover (13), by back cover (13) in mesochite (12) connection, two locating studs (14) are located with mesochite (12) and back cover (13) and are docked, two pieces of wearing plates (10) are loaded in mesochite (12) in its gas pressure relief slot direction upwards, again master gear (03) loading main shaft (01) is gone up and the assemblying body that partnered by gear key (05) and jump ring (06), with to load from gear (04) from axle (02) and to be partnered assemblying body by gear key (05) and jump ring (06), it is inner and engage each other that the two pairs of assemblying bodys are arranged on mesochite (12) respectively, wherein the assemblying body of master gear (03) and main shaft (01) is positioned on the central axis of pump main body, again two pieces of wearing plates (10) to be loaded in the downward direction of its gas pressure relief slot in mesochite (12) and to be positioned at master gear (03) and above gear (04), two locating studs (14) are inserted in the pin-and-hole of mesochite (12), O type circle (16) is loaded in the O type circle groove of fore shell (11), locate by mesochite (12) in fore shell (11) connection and with its two locating studs (14) and dock, main shaft (01) and to pierce into axle sleeve (09) respectively from axle (02), fore shell (11), mesochite (12) and back cover (13) are fitted together and is formed by connecting by four or eight bolts (17) and be integrated.

About the explanation of above-described embodiment Fig. 1, professional and technical personnel in the field can be enable to realize or use this patent, visible to the various amendment of these embodiments or adjustment concerning professional and technical personnel in related domain, the General Principle that the utility model defines and structure can when not departing from spirit or scope of the present utility model, also can realize in other embodiments, therefore, the utility model can not be restricted to these embodiments as herein described, but the widest scope consistent with the principle involved by this paper and structure and selection and feature will be met.

Claims

1. a novel fluorine liner magnetic gear pump, it is characterized in that: pump main body is formed by connecting with four or eight bolts (17) by fore shell (11), mesochite (12) and back cover (13) and four locating studs (14), a kind of pump that pump main body is connected with nut (23) with pump-foot (30) bolt (21), pad (22) and forms, pump main body adopts stainless steel high-quality material to carry out precision machining manufacture and forms; Wherein, mold pressing fluorine liner (61A) is lined with in fore shell (11), mold pressing fluorine liner (62B) is lined with in the import and export all that mesochite (12) comprises both sides, fluorine liner (63C) is lined with in back cover (13), inner magnet (25) is encapsulated by fluorine liner (64D) and forms, be lined with fluorine liner (65E) in separation sleeve (26), all can not contact with the metallic material of pump main body when ensure that medium transport.

2. pump according to claim 1, it is characterized in that: inner magnet key (07) is inserted on main shaft (01), inner magnet (25) is contained on main shaft (01) by the direction aiming at inner magnet key (07), and pin inner magnet (25) with inner magnet jump ring (08), the O type circle (18) of separation sleeve (26) is loaded in the O type circle groove of fore shell (11), by six screws (24), separation sleeve (26) and fore shell (11) are integrally connected; Fore shell (11) and base (30) are linked together by bolt (21), pad (22) and nut (23); The outer magnet (27) connected to form by bolt (20) is fixedly connected with by screw (29) with motor (40) by its Hub port (28), and pump-foot (30) same to motor (40) connects to form one by bolt (31).

3. pump according to claim 1 and 2, it is characterized in that: separation sleeve (26) stainless steel or alloy material can be selected and in be lined with fluorine liner (65E), inner magnet (25) can be selected stainless steel and neodymium iron boron or samarium-cobalt magnet and be encapsulated by fluorine liner (64D) and form, outer magnet (27) can select carbon steel or stainless steel and neodymium iron boron or samarium-cobalt magnet organic assembling to form, there is High Temperature High Pressure and high magnetic force height moment of torsion feature, guarantee zero leakage pulsating movement free, separation sleeve (26), inner magnet (25) and outer magnet (27) and fluorine liner are all provided with multiple specification varied in size, the moment of torsion that varies in size can be provided and be provided with the multiple connecting shaft hole varied in size, multiple series can be formed with multiple motor (40) or organic docking of link.

4. pump according to claim 1 and 2, it is characterized in that: insert two axle sleeve pins (15) respectively in the axle sleeve pin-and-hole of fore shell (11) and back cover (13), insert two axle sleeves (09) respectively in the axle sleeve hole of fore shell (11) and back cover (13), axle sleeve trough aligned axle sleeve pin (15) is also fixed respectively, back cover (13) kept flat and two locating studs (14) is inserted in the pin-and-hole of back cover (13), O type circle (16) being loaded in the O type circle groove of back cover (13), by back cover (13) in mesochite (12) connection, two locating studs (14) are located with mesochite (12) and back cover (13) and are docked, two pieces of wearing plates (10) are loaded in mesochite (12) in its gas pressure relief slot direction upwards, again master gear (03) loading main shaft (01) is gone up and the assemblying body that partnered by gear key (05) and jump ring (06), with to load from gear (04) from axle (02) and to be partnered assemblying body by gear key (05) and jump ring (06), it is inner and engage each other that the two pairs of assemblying bodys are arranged on mesochite (12) respectively, wherein the assemblying body of master gear (03) and main shaft (01) is positioned on the central axis of pump main body, again two pieces of wearing plates (10) to be loaded in the downward direction of its gas pressure relief slot in mesochite (12) and to be positioned at master gear (03) and above gear (04), two locating studs (14) are inserted in the pin-and-hole of mesochite (12), O type circle (16) is loaded in the O type circle groove of fore shell (11), locate by mesochite (12) in fore shell (11) connection and with its two locating studs (14) and dock, main shaft (01) and to pierce into axle sleeve (09) respectively from axle (02), fore shell (11), mesochite (12) and back cover (13) are fitted together and is formed by connecting by four or eight bolts (17) and be integrated.

5. the pump according to claim 1 or 4, it is characterized in that: main shaft (01) and from axle (02) and master gear (03) be provided with multiple specification that varies in size from gear (04), wearing plate (10), axle sleeve (09) are all provided with multiple specification that varies in size, pump fore shell (11), mesochite (12) and back cover (13) can be provided with multiple specification that varies in size, and can synthesize multiple specification series by organic matched group between them; All non-metallic material is selected with the flow passage components of the pump inside of medium contact, comprise PEEK, Teflon, Ryton, Kynar, SiC, C60 or the high-quality non-metallic material of ceramic band selflubricating, there is corrosion-resistant, acid resistant alkali, wear-resistant and can carry the feature of Specialty Chemical medium, the using scope of gear pump is expanded to the Application in Chemical Engineering that viscosity is low to moderate 0.3cP, and significant prolongation working life of pump, even if can normally use too when ultra-low quantity of flow.