CN110360096A - Crescent gear pump - Google Patents
Crescent gear pump Download PDFInfo
- Publication number
- CN110360096A CN110360096A CN201910756326.XA CN201910756326A CN110360096A CN 110360096 A CN110360096 A CN 110360096A CN 201910756326 A CN201910756326 A CN 201910756326A CN 110360096 A CN110360096 A CN 110360096A
- Authority
- CN
- China
- Prior art keywords
- shell
- cover
- gear pump
- trochoidal curve
- crescent gear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- 238000000465 moulding Methods 0.000 description 32
- 238000001746 injection moulding Methods 0.000 description 18
- 238000005245 sintering Methods 0.000 description 17
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 239000003921 oil Substances 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 10
- 239000010949 copper Substances 0.000 description 10
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
- F01C21/104—Stators; Members defining the outer boundaries of the working chamber
- F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
-
- 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
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
-
- 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
- F04C2230/00—Manufacture
- F04C2230/20—Manufacture essentially without removing material
- F04C2230/22—Manufacture essentially without removing material by sintering
-
- 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
- F04C2230/00—Manufacture
- F04C2230/60—Assembly methods
-
- 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
- F04C2240/00—Components
- F04C2240/30—Casings or housings
-
- 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
- F04C2240/00—Components
- F04C2240/50—Bearings
- F04C2240/56—Bearing bushings or details thereof
-
- 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
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/805—Fastening means, e.g. bolts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/20—Resin
Abstract
A kind of leakproofness between the resin-made housing and cover that can steadily ensure to constitute trochoidal curve receiving portion is provided, sealing ring at the part can be also omitted, the stabilized crescent gear pump of discharge ability can be made.Crescent gear pump (1) includes trochoidal curve portion (4), the trochoidal curve portion is accommodated in the outer rotor (2) with multiple internal tooths, by the internal rotor (3) with multiple external tooths with the state of external tooth and interior tooth engagement and bias；Shell (5) is formed trocoid accommodating recess (5a)；And cover (6), occlude the recess portion (5a), shell (5) is the injection molded article of resin combination, shell (5) is bolted with cover (6), there are metal bushing (7) in the bolt fixing hole part of shell (5), in shell (5) and the joint portion section of cover (6), from the bottom surface (5c) of recess portion (5a), the end face position (7a) of bushing (7) is higher than the bushing forming face (5e) around the bushing of shell (5), and it is lower than the sealing surface (5d) around the recess portion of shell (5).
Description
The application is that application No. is the divisional applications of the Chinese invention patent application of " 201680057233.2 ".Original application
The applying date is on September 29th, 2016 (PCT international filing date), China national application number is that " 201680057233.2 " (PCT is international
Application number is PCT/JP2016/078755), invention and created name is " crescent gear pump ".
Technical field
The present invention relates to the crescent gear pump of the liquid such as pressure oil, water, medical fluid (trochoid pumps).
Background technique
Crescent gear pump (trochoid pump) is following pump: by with trochoidal curve tooth form outer rotor and internal rotor with close
The state closed is contained in shell, and to be revolved with the rotation of drive shaft, the internal rotor fixed with drive shaft and outer rotor
Turn, draw liquid into and the mode being discharged acts on.As this pump, in recent years, as can cut down machining operation, can
The pump being manufactured with low cost, it is known to the pump (referring to patent document 1) of the shell with resin.
According to Fig. 4 and Fig. 8, the construction of this crescent gear pump is illustrated.
Fig. 4 is the cross-sectional view of previous crescent gear pump.As shown in figure 4, the pump 21 is in the ring with multiple internal tooths
Receiving has based on trochoidal curve portion 24 made of the internal rotor 23 of multiple external tooths in the outer rotor 22 of shape.The trochoidal curve portion 24 rotation
Turn to be housed in circular trochoidal curve accommodating recess 25a freely, trochoidal curve accommodating recess 25a is formed in flanged cylindric
Shell 25.The cover 26 of occlusion trochoidal curve accommodating recess 25a is fixed in shell 25.
Trochoidal curve portion 24 with the state of the interior tooth engagement of the external tooth of internal rotor 23 and outer rotor 22 and bias by that interior will be turned
Son 23 is rotatably freely housed in outer rotor 22 and constitutes.Between the separation that each rotor contacts with each other, with trochoidal curve portion 24
Direction of rotation accordingly form the chamber volume of suction side and discharge side.The drive shaft 29 rotated by driving source (not shown)
Perforation ground is fixed on the axle center of internal rotor 23.When drive shaft 29 rotates and rotates internal rotor 23, external tooth and outer rotor 22
Interior tooth engagement increases volume by the rotation so that outer rotor 22 drives rotation in the same direction, and liquid is from suction inlet
It is inhaled into the suction side chamber volume as negative pressure.The suction side chamber volume becomes to subtract volume since trochoidal curve portion 24 rotates
Less, the discharge side chamber volume that internal pressure rises, the liquid being inhaled into are discharged to outlet from the discharge side volume.
Cover 26 is sintering metal system, and shell 25 is the injection moulding using resin combination by injection moulding manufacture
Body.Make the bolt fixing hole sectoral integration of metal bushing 27 and shell 25 by composite molding in injection moulding,
The bolt 28 passed through and via bushing 27, shell 25 and cover 26 are connected and fixed on the fixed plate 30 of equipment body.In shell
The middle sandwiched bushing 27 that is connected and fixed of body 25 and cover 26 is to keep the bonding strength at coupling part.
On the joint surface (mating surface) of shell 25 and cover 26, it is equipped in the slot 32 for the recess portion periphery for being formed in shell 25
Sealing ring (O-ring) 31.Thereby, it is possible to seal trochoidal curve accommodating recess 25a, prevent liquid from the cooperation of shell 25 and cover 26
The leakage in face.In crescent gear pump, in order to effectively play pumping function, steadily ensure the mating surface of shell 25 and cover 26
The leakproofness (leakproofness of trochoidal curve accommodating recess 25a) at place is critically important.As the material of sealing ring 31 because have -30~
120 DEG C or so of heat resistance, oil resistivity, can be applied to the scroll compressor of air-conditioning, therefore, use hydrogenated nitrile-butadiene rubber
(H-NBR system) etc..
Fig. 8 is the cross-sectional view of other previous crescent gear pumps.As shown in figure 8, the pump 61 is with multiple internal tooths
Cricoid outer rotor 62 in receiving have made of the internal rotor 63 of multiple external tooths based on trochoidal curve portion 64.The trochoidal curve portion
64 are rotatably freely housed in circular trochoidal curve accommodating recess 65a, and trochoidal curve accommodating recess 65a is formed in flanged circle
Columnar shell 65.The cover 66 of occlusion trochoidal curve accommodating recess 65a is fixed in shell 65.
Trochoidal curve portion 64 with the state of the interior tooth engagement of the external tooth of internal rotor 63 and outer rotor 62 and bias by that interior will be turned
Son 63 is rotatably freely housed in outer rotor 62 and constitutes.Between the separation that each rotor contacts with each other, with trochoidal curve portion 64
Direction of rotation accordingly form the chamber volume of suction side and discharge side.The drive shaft 69 rotated by driving source (not shown)
Perforation ground is fixed on the axle center of internal rotor 63.When drive shaft 69 rotates and rotates internal rotor 63, external tooth and outer rotor 62
Interior tooth engagement increases volume by the rotation so that outer rotor 62 drives rotation in the same direction, and liquid is from suction inlet
It is inhaled into the suction side chamber volume as negative pressure.The suction side chamber volume becomes to subtract volume since trochoidal curve portion 64 rotates
Less, the discharge side chamber volume that internal pressure rises, the liquid being inhaled into are discharged to outlet from the discharge side chamber volume.
Cover 66 is sintering metal system, and shell 65 is the injection moulding using resin combination by injection moulding manufacture
Body.By bolt 68, shell 65 is connected and fixed on the fixed plates 70 of equipment body with cover 66.In addition, in shell 65 and cover 66
Joint surface (mating surface) is equipped with sealing ring 71 in the slot for the recess portion periphery for being formed in shell 65.Trochoidal curve is accommodated as a result,
Recess portion 65a sealing prevents liquid from the leakage of the combined shell 65 for becoming resin and sintering metal and the mating surface of cover 66.
By making 65 injection molded article of shell (resin-formed body), do not need to be machined, it is relatively inexpensive.In addition, shell
Body 65 is in bottom surface 65c and medial surface 65b and 63 sliding contact of outer rotor 62 and internal rotor for constituting trochoidal curve accommodating recess 65a.
The medial surface 65b of trochoidal curve accommodating recess 65a is the injection moulding body portion of resin combination, therefore, with rubbing for outer rotor 62
Excellent is damaged in scouring.In addition, the bottom surface 65c of trochoidal curve accommodating recess 65a is by integrated with shell 65 by composite molding
Discoid metal plate 67 constitute.The problems such as contraction being formed by resin in the case where the 65c of bottom surface as a result, will not generate, and put down
Face degree is excellent, it is suppressed that the deviation of discharging performance.
Citation
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2014-51964 bulletin
Summary of the invention
Subject to be solved by the invention
As described above, in the crescent gear pump for being made of resin shell of Fig. 4, at the coupling part in order to keep pump
Bonding strength, the metal bushing with shell composite molding (insert molding) is utilized.Here, for the company of stably keeping
Relay needs to prevent the resin in above-mentioned forming to be coated on the cover side end face as the joint surface of bushing and cover.Thus, for example,
It is contemplated that the bushing forming face around the bushing of shell is made to be recessed than sealing surface (mating surface with cover), bush end face, make bushing
It is slightly more prominent than the bushing forming face.
But in the past, the positional relationship after not determining the forming of sealing surface, bushing forming face and bush end face, according to
The molding condition of the overhang of bushing, shell, sealing surface is lower than bush end face sometimes.In this case, bushing is to be bolted
Part, therefore contacted with cover, but sealing surface is not contacted with cover, does not ensure the leakproofness at the hermetic unit.In this case, it
Ensure leakproofness by sealing ring.
It, can not be than as its heat resisting temperature in the case where the sealing ring by H-NBR system etc. is to ensure leakproofness
It is used in the environment of 120 DEG C of high temperature.In addition, needing the installation procedure of sealing ring in pump manufacturing process.
(the 1st following inventions) of the invention are made to cope with such problems, and its purpose is to provide one kind
It can steadily ensure to constitute the leakproofness between the resin-made housing and cover of trochoidal curve receiving portion, can also omit at the part
Sealing ring, the stabilized crescent gear pump of discharge ability can be made.
In addition, in the crescent gear pump as being illustrated according to above figure 4, Fig. 8, in order to inexpensively manufacture pump,
Shell is manufactured by the injection moulding of resin, but the holding of the depth dimensions of trochoidal curve receiving portion, diameter dimension has been injection moulded
At state it is constant, slightly there is deviation in each product individual.Especially for the depth of receiving portion, due to influencing whether to be discharged
Amount, therefore, the deviation of depth may become the deviation of discharge rate.
(the 2nd following inventions) of the invention are made to cope with such problems, and its purpose is to provide one kind
Deviation that the depth of the trochoidal curve receiving portion between individual can be reduced, the crescent gear pump with stable discharge ability.
Means for solving the problems
The crescent gear pump of the 1st invention of the application has trochoidal curve portion, and the trochoidal curve portion is with multiple internal tooths
In outer rotor, rotatably freely with the state of aforementioned external teeth and above-mentioned interior tooth engagement and bias by the internal rotor with multiple external tooths
Receiving, between above-mentioned internal tooth and aforementioned external teeth, is formed with the suction side chamber volume drawn liquid into and will be drawn into the sucking
The discharge side chamber volume of the liquid discharge of side chamber volume, wherein have shell with the recess portion for accommodating above-mentioned trochoidal curve portion, with
And the cover of the above-mentioned recess portion of the shell is occluded, above-mentioned shell is the injection molded article of resin combination, above-mentioned shell and above-mentioned cover
It is bolted, there is metal bushing in the bolt fixing hole part of above-mentioned shell, in connecing for above-mentioned shell and above-mentioned cover
In conjunction portion section, from the bottom surface of above-mentioned recess portion, the endface position of the above-mentioned cover side of above-mentioned bushing is more above-mentioned than above-mentioned shell
Bushing forming face around bushing is high and identical or lower than the sealing surface as the sealing surface around the above-mentioned recess portion of above-mentioned shell.
Wherein, above-mentioned sealing surface is the surface from the continuous face of medial surface of the above-mentioned recess portion of above-mentioned shell, with above-mentioned cover
Be close to and by the concave seal.
Wherein, above-mentioned crescent gear pump is not in the joint portion sandwiched sealing ring of above-mentioned shell and above-mentioned cover.
Wherein, the medial surface of the above-mentioned recess portion of above-mentioned shell is made of the injection molded article of above-mentioned resin combination, above-mentioned
The bottom surface of recess portion is made of metallic object.
Wherein, above-mentioned resin combination is to cooperate using polyphenylene sulfide as matrix resin and in matrix resin from glass fibers
Selected in dimension, carbon fiber and inorganic filler it is at least one kind of made of resin combination.
The crescent gear pump of the 2nd invention of the application has trochoidal curve portion, and the trochoidal curve portion is with multiple internal tooths
In outer rotor, rotatably freely with the state of aforementioned external teeth and above-mentioned interior tooth engagement and bias by the internal rotor with multiple external tooths
Receiving, between above-mentioned internal tooth and aforementioned external teeth, is formed with the suction side chamber volume drawn liquid into and will be drawn into the sucking
The discharge side chamber volume of the liquid discharge of side chamber volume, wherein there is the remaining pendulum for the sintering metal for accommodating above-mentioned trochoidal curve portion
Line receiving portion and the shell engaged with the outside of the trochoidal curve receiving portion, above-mentioned shell are the injection moulding of resin combination
Body, above-mentioned trochoidal curve receiving portion and above-mentioned shell enter the outer surface of the trochoidal curve receiving portion by a part of the shell
It is sintered microporous and engage.
Wherein, above-mentioned trochoidal curve receiving portion include main part with cylindric medial surface and tabular inner bottom surface and
Cover the cover of the opening portion of the main part.In addition, above-mentioned cover is fixed on aforementioned body portion by fastening (Japanese: add and form め)
Opening portion.
In addition, wherein in the mode that trochoidal curve receiving portion is made of aforementioned body portion and above-mentioned cover, above-mentioned trochoidal curve
Receiving portion and above-mentioned shell by a part of the shell enter the trochoidal curve receiving portion aforementioned body portion and above-mentioned cover
Outer surface sintered microporous and engage.
Invention effect
The crescent gear pump of the 1st invention of the application, which has the shell with trochoidal curve accommodating recess and occludes, to be somebody's turn to do
The cover of recess portion, shell are the injection molded articles of resin combination, and shell is bolted with cover, in the bolt fixing hole portion of shell
Dividing has metal bushing, in the joint portion section of shell and cover, from the bottom surface of trochoidal curve accommodating recess, and the end of bushing
Face position is higher than the bushing forming face around the bushing of shell, and or ratio identical as the sealing surface around the recess portion of shell should
Sealing surface is low, therefore, can prevent the bush end face in housing molding from being coated by resin.In addition, the not molding condition of tube shell
How, when being bolted, sealing surface is preferentially close to cover, becomes the form contacted always, can ensure partially stabilizedly at this
The leakproofness of trochoidal curve accommodating recess, discharge ability also stabilize.
In addition, ensure that leakproofness as described above, therefore, the sealing configured in the past can be omitted in the periphery of sealing surface
Circle.Therefore, in pump manufacturing process, the installation procedure of sealing ring is not needed, assembly becomes easy.In addition, than as H-
It is also able to use in the environment of 120 DEG C of high temperature of the heat resisting temperature of NBR system O-ring.
Above-mentioned sealing surface is close to the surface of cover and is incited somebody to action from the continuous face of medial surface of the trochoidal curve accommodating recess of shell
Therefore the concave seal can prevent liquid from entering between cover and shell from trochoidal curve accommodating recess.
The medial surface of the trochoidal curve accommodating recess of above-mentioned shell is made of the injection molded article of resin combination, above-mentioned recess portion
Bottom surface be made of metallic object, therefore, can the medial surface realize friction and wear characteristic improvement, and the bottom surface inhibit
The deviation of discharging performance.
The resin combination for forming shell is to cooperate using polyphenylene sulfide as matrix resin and in matrix resin from glass
Selected in fiber, carbon fiber and inorganic filler it is at least one kind of made of resin combination, therefore, oil resistivity, chemical-resistant resistance
Property is excellent, and dimensional accuracy also greatly improves.
The crescent gear pump of the 2nd invention of the application has the trochoidal curve receiving of the sintering metal in receiving trochoidal curve portion
Portion and the shell engaged with the outside of trochoidal curve receiving portion, shell are the injection molded article of resin combination, trochoidal curve receiving
Portion is engaged with shell by the sintered microporous of outer surface that a part of the shell enters the trochoidal curve receiving portion.That is, remaining
Cycloid receiving portion is different components from shell, by shell composite molding (insertion around previously fabricated trochoidal curve receiving portion
Molding), thus the structure with the engagement of two components.It is manufactured by making entire trochoidal curve receiving portion as different components, it can
Reduce the deviation of the receiving portion depth between individual.In addition, depth itself can also be accurately proceed processing.As a result, not had
There are the deviation of the discharge rate between individual and the crescent gear pump with stable discharge ability.
As in the past in the case where shell forms trocoid receiving portion, in order to inhibit the depth of the receiving portion
Deviation needs the processing of entire shell, but by only making the different components in trochoidal curve receiving portion, it is no longer necessary to which entire shell adds
Work.As long as depth trochoidal curve receiving portion adjusted and shell composite molding are able to suppress additional processing charges.And
And trochoidal curve receiving portion is therefore sintering metal system can be easily manufactured, in composite molding using to sintered microporous
Anchoring effect is securely engaged with resin-case.
In addition, being only just able to carry out setting for discharge rate by the part by making trochoidal curve receiving portion be independent component
Meter.Therefore, trochoidal curve receiving portion universal component can be made.In housing molding, answered using only the trochoidal curve receiving portion
Synthesis type is capable of the freedom degree of Widening Design.
Above-mentioned trochoidal curve receiving portion includes having the main part of cylindric medial surface and tabular inner bottom surface and covering this
The cover of the opening portion of main part, therefore, the adjustment of receiving portion depth can only pass through the plane machining of the axial cross section of cylinder
It executes, machining is easy.
Above-mentioned cover is by being fastened and fixed to the opening portion of main part, therefore, it is no longer necessary to previous such bolt fastening
Process.In addition, coupling part is possible to loosen in the case where resinite and metallic object to be bolted, but will be led by fastening
Body portion and cover are fixed, from without such worry.
In addition, trochoidal curve receiving portion and shell enter the main body in the trochoidal curve receiving portion by a part of the shell
Portion and the outer surface of cover sintered microporous and engage, that is, shell is formed as also covering cover side, therefore, can prevent cover
It falls off from main part.
Detailed description of the invention
Fig. 1 is the assembling stereogram for indicating the example of the crescent gear pump of the 1st invention of the application.
Fig. 2 is the axial sectional view and enlarged drawing of the crescent gear pump of Fig. 1.
Fig. 3 is the axial sectional view and enlarged drawing for indicating the other examples of the crescent gear pump of the 1st invention of the application.
Fig. 4 is the axial sectional view of previous crescent gear pump.
Fig. 5 is the axial sectional view for indicating the example of the crescent gear pump of the 2nd invention of the application.
Fig. 6 is the axial sectional view for indicating the other examples of the crescent gear pump of the 2nd invention of the application.
Fig. 7 is the axial sectional view for indicating the other examples of the crescent gear pump of the 2nd invention of the application.
Fig. 8 is the axial sectional view of previous crescent gear pump.
Specific embodiment
Illustrate an embodiment of the crescent gear pump of the 1st invention of the application according to Fig. 1 and Fig. 2.Fig. 1 is internal messing tooth
The assembling stereogram of wheel pump, Fig. 2 (a) are the axial sectional views of the crescent gear pump, and Fig. 2 (b) is in the crescent gear pump
Shell sealing surface periphery enlarged drawing.It is received in cricoid outer rotor 2 as shown in Figure 1, the crescent gear pump 1 is included
Have the trochoidal curve portion (Japanese: ト ロ U イ De) 4 of internal rotor 3；It is formed with the circle for rotatably freely accommodating in the trochoidal curve portion 4
The shell 5 of recess portion (trochoidal curve accommodating recess) 5a of shape；And the cover 6 of the trochoidal curve accommodating recess 5a of occlusion shell 5.Covering 6 is
The shape generally conformed to the shape of the upper surface of the shell 5 of trochoidal curve accommodating recess 5a opening.As shown in Fig. 2 (a), shell 5
The fixed plate 11 of equipment body is connected and fixed on by bolt 9 with cover 6.In addition, having coaxial with the rotation center of internal rotor 3
Fixed drive shaft 10.Drive shaft 10 is supported by the bearing (diagram is omitted) etc. for being pressed into cover 6.
The external tooth of internal rotor 31 fewer than the internal tooth of outer rotor 2, internal rotor 3 is inscribed with above-mentioned internal tooth with aforementioned external teeth and nibbles
The eccentric state of conjunction is housed in outer rotor 2.Rotation side between the separation that each rotor contacts with each other, with trochoidal curve portion 4
To the chamber volume for accordingly forming suction side and discharge side.In the bottom surface 5c of the trochoidal curve accommodating recess 5a of shell 5, be formed with
The suction inlet of the chamber volume connection of suction side and the outlet being connected to the chamber volume of discharge side.In addition, with suction side chamber volume
The suction inlet of connection and the outlet being connected to discharge side chamber volume are formed in shell 5, cover 6, at least any in drive shaft 10
It is a.
In the crescent gear pump 1, rotate trochoidal curve portion 4 by drive shaft 10, so that liquid is inhaled from suction inlet
Enter to volume to increase and become the suction side chamber volume of negative pressure.The suction side chamber volume becomes to hold since trochoidal curve portion 4 rotates
The discharge side chamber volume that product is reduced, internal pressure rises, the liquid being inhaled into are discharged to outlet from the discharge side chamber volume.It is above-mentioned
Pumping action continuously carried out by the rotation in trochoidal curve portion 4, liquid is by continuously force feed.Also, using due to being inhaled into
Liquid and the hydraulic seal that improves the airtightness of each chamber volume, the pressure difference generated between each chamber volume become larger, can be obtained
Big pumping action.
Cover 6 is made of metal, and shell 5 is the injection molded article of resin combination.The shell 5 of resin is being connected by bolt
In the case where being connected to equipment body, the loosening of coupling part caused by the deformation of creep due to resin can be worried.As resin
Material, although also creep can be coped with by using aftermentioned such defined resin combination for being combined with reinforcing agent etc.,
But sometimes more crisp and poor impact resistance.Therefore, in order to keep the bonding strength at coupling part, in the bolt fixing hole of shell 5
Part is provided with metal bushing 7.The bolt 9 passed through and via bushing 7, shell 5 and cover 6 are connected and fixed on equipment
The fixed plate 11 of main body.
Metal bushing 7 is the cylindrical shape with flange 7b, is arranged with penetrating through the flange part 5g of shell 5.7 energy of bushing
It is enough that shell 5 is fixed on by indentation, or, above-mentioned bushing can be configured in mold in the injection moulding of shell 5 and passed through
Composite molding makes its integrated (insert molding) and fixes.In particular, using insert molding, and use the bushing of sintering metal
7, so that resin enters the surface voids of sintered body, bushing 7 and shell 5 are securely engaged using anchoring effect.
As shown in Fig. 2 (b), sealing surface 5d is the table from the continuous face medial surface 5b of trochoidal curve accommodating recess 5a, with cover
It is close to trochoidal curve accommodating recess 5a be sealed to the mating face seal of shell 5 and cover in face.In shell 5, make and medial surface 5b
Adjacently continuously the surface of cover side is sealing surface 5d, so as to prevent liquid from entering cover and shell from trochoidal curve accommodating recess
Between body.
In the crescent gear pump of the 1st invention of the application, after the forming of the end face of the sealing surface and bushing of shell
Positional relationship on have feature.That is, on the basis of the bottom surface 5c of trochoidal curve accommodating recess 5a, from the 5c of the bottom surface, bushing 7
Cover side end face 7a height and position be (1) is than the bushing forming face 5e high around the bushing of shell 5 and (2) are than shell 5
Sealing surface 5d around recess portion low position.The relationship is the positional relationship after the forming of shell 5.
By the relationship of (1), when can prevent the composite molding in shell 5 and bushing 7, the end face 7a of bushing 7 is by resin
Cladding.The end face 7a of bushing 7 from the overhang h1 of bushing forming face 5e be such as 0.01mm~0.3mm.As long as the end face of bushing 7
The slightly prominent cladding that can prevent above-mentioned resin of 7a.
By the relationship of (2), sealing surface 5d is in the position of the end face 7a high than bushing 7, therefore, close when being bolted
Cover 5d is preferentially close to cover.Due to the positional relationship being defined as after shaping, regardless of molding condition, all in sealing
The state that face 5d is contacted with cover always can steadily ensure the leakproofness of trochoidal curve accommodating recess 5a, also make discharge ability steady
Fixedization.In addition, due to that can ensure sufficient leakproofness by sealing surface 5d, as shown in Figures 1 and 2, it can seal
Omit the sealing ring configured in the past in the periphery of face 5d.
In addition, the height of the end face 7a of bushing 7 can also be identical with the height of the sealing surface 5d of shell 5.In this case
It can similarly ensure the leakproofness at sealing surface 5d.Because can more stably make sealing surface 5d contact with cover, it is therefore preferable that
The position for keeping sealing surface 5d more slightly higher than end face 7a.The difference of the height of the sealing surface 5d of the height and shell 5 of the end face 7a of bushing 7
H2 is such as 0.01mm~0.3mm.
In Fig. 2 (a), shell 5 is in the bottom surface 5c and medial surface 5b and the outer rotor 2 that constitute trochoidal curve accommodating recess 5a and interior
3 sliding contact of rotor.The medial surface 5b of trochoidal curve accommodating recess 5a is the injection moulding body portion of resin combination, therefore, with
The friction and wear characteristic of outer rotor 2 is excellent.In addition, the bottom surface 5c of trochoidal curve accommodating recess 5a is by passing through composite molding and shell 5
Integrated discoid metal plate 8 is constituted.As a result, compared with being formed by resin in the case where the 5c of bottom surface, flatness is excellent, energy
Enough inhibit the deviation of discharging performance.As metal plate 8, sintering metal body, smelting metal body (metal punching part) can be used.
In addition, the injection molded article by making 5 resin combination of shell, can be drawn liquid by resin combination
Cast gate 5h is integrally formed with shell 5.As needed, filter 13 can be fixed on to become to suction side by deposition etc. and held
The end of the liquid sucking cast gate 5h of access entrance (fluid intake) until product room.By filter 13, can prevent
Foreign matter is mixed into pump.In addition, the structure of trochoidal curve accommodating recess is not in the crescent gear pump of the 1st invention of the application
It is defined in structure shown in Fig. 2, also may include the injection molded article that bottom surface is all set as resin combination inside.Thereby, it is possible to
Trochoidal curve accommodating recess without being machined into is formed by injection moulding, therefore relatively inexpensive.
Illustrate the other embodiments of the crescent gear pump of the 1st invention of the application according to Fig. 3.Fig. 3 (a) is the internal messing
The axial sectional view of gear pump, Fig. 3 (b) are the enlarged drawings on the sealing surface periphery of the shell in the crescent gear pump.Such as Fig. 3
(a) and shown in Fig. 3 (b), in the crescent gear pump 1, have by the part of the periphery sealing of trochoidal curve accommodating recess 5a
Cricoid slot 5f is equipped with sealing ring 12 in slot 5f.In addition to this structure and crescent gear pump phase shown in Fig. 2
Together.As shown in Fig. 3 (b), sealing surface 5d be from the continuous face trochoidal curve accommodating recess 5a medial surface 5b, be close to the surface of cover and
1st sealing trochoidal curve accommodating recess 5a.On the basis of the bottom surface 5c of trochoidal curve accommodating recess 5a, from the 5c of the bottom surface, lining
The height and position of the end face 7a of the cover side of set 7 is that (1) is than the bushing forming face 5e high around the bushing of shell 5 and (2) compare shell
Sealing surface 5d around 5 recess portion low position.
In the crescent gear pump of Fig. 3, other than the seal construction, sealing ring 12 is also installed, the sealing ring is passed through
12 and the 2nd sealing trochoidal curve accommodating recess 5a.Therefore, it can more stably ensure the leakproofness of trochoidal curve accommodating recess 5a,
Safety coefficient becomes higher.In addition, in the case where sealing ring 12 are arranged, the also phase such as overhang of bushing in above-mentioned seal construction
Together.That is, in the mode of Fig. 3, the height of the end face 7a of bushing 7 from the overhang h1 of bushing forming face 5e and the end face 7a of bushing 7
The difference h2 of the height of the sealing surface 5d of degree and shell 5 is also respectively such as 0.01mm~0.3mm.
The material of sealing ring is not particularly limited, if selective hydrogenation nitrile rubber, fluorubber, acrylic rubber etc. with
On the way, the rubber material etc. that use environment meets.For example, in the scroll compressor of air-conditioning, it is desirable that -30~120 DEG C of left sides
Heat resistance, the oil resistivity on the right side, it is therefore preferable that using hydrogenated nitrile-butadiene rubber (H-NBR system).
Formed shell resin combination be using can injection molding synthetic resin as the resin combination of matrix resin.
As the matrix resin, can enumerate for example plasticity polyimide resin, polyether ketone resin, polyether-ether-ketone (PEEK) resin,
Polyphenylene sulfide (PPS) resin, polyamide-imide resin, polyamide (PA) resin, polybutylene terephthalate (PBT) (PBT) tree
Rouge, polyethylene terephthalate (PET) resin, polyethylene (PE) resin, polyacetal resin, phenolic resin etc..These are each
Resin both can be used alone, can also also two or more mixing polymer alloy.Among these heat-resistant resins, due to
Creep resistant, load resistance, wear resistance, the chemical resistance of formed body etc. are excellent, it is therefore especially preferred that using PPS tree
Rouge.
It is preferred that individually or suitably and with effective assigning high intensity, high resiliency, high dimensional accuracy, wear resistance
Anisotropic glass fibre, carbon fiber or the inorganic filler that removal injection moulding is shunk.Especially glass fibre and inorganic
Filler is used in combination, and economy is excellent, and friction and wear characteristic in the oil is excellent.
In the 1st invention of the application, particularly preferably use using the PPS resin of straight chain type as matrix resin and in matrix tree
As resin combination made of filler cooperation glass fibre and bead in rouge.With this configuration, oil resistivity, chemically-resistant medicine
Moral character is excellent, excellent tenacity, and the anisotropy removal shunk by injection moulding makes the warpage of flange part become smaller, dimensional accuracy
Also it greatly improves.In addition, other than the structure, omit the sealing ring of rubber system as shown in Figure 2, thus more than 120 DEG C that
It can also be suitble to use under the hot environment of sample.
The means these each raw material are mixed, mixed are not particularly limited, can using Henschel mixer (Japanese:
ヘ Application シ ェ Le ミ キ サ ー), ball mixing machine (Japanese: ボ ー Le ミ キ サ ー), spiral ribbon mixer, Luo Dige mixing machine (Japanese:
レ デ ィ ゲ ミ キ サ ー), super Henschel mixer etc. dry type mixing is carried out to powder raw material, then utilize double screw extruder
Equal melt extruders carry out melting mixing, obtain molding pellet.In addition, the charging of packing material can also utilize twin-screw
Using lateral charging when the meltings such as extruder mix.Using the molding pellet, by being injection moulded come Shaped shell.It is shaping
When, metal bushing is configured in mold, passes through composite molding integration.In addition, forming when, set mold shape and
Molding condition, so that bushing and shell meet above-mentioned relationship (1) (2) after forming.
In the crescent gear pump of the 1st invention of the application, as cover, in addition to above-mentioned metal (iron, stainless steel, burning
Tie metal, aluminium alloy etc.) except, be able to use resin (material identical with shell), or metal and resin it is compound
Molded part.In addition, as outer rotor, internal rotor, it is preferable to use sintering metal (iron series, copper and iron system, copper system, stainless steel system etc.),
The particularly preferred iron series in price.It is high using antirust ability but in the trochoid pump of force feed water, medical fluid etc.
Stainless steel system etc..
Illustrate an embodiment of the crescent gear pump of the 2nd invention of the application according to Fig. 5.Fig. 5 is crescent gear pump
Axial sectional view.As shown in figure 5, the crescent gear pump 41 has: containing internal rotor 43 in cricoid outer rotor 42
Trochoidal curve portion 44；The trochoidal curve receiving portion 46 that the trochoidal curve portion 44 is rotatably freely accommodated；And it is accommodated with the trochoidal curve
The shell 45 that the outside in portion 46 engages and supported.Trochoidal curve receiving portion 46 includes: with cylindric medial surface 47b peace
The main part 47 of the inner bottom surface 47c of plate and cover main part 47 opening portion 47a cover 48.In addition, having and interior turn
The co-axially fixed drive shaft 49 of rotation center of son 43.Drive shaft 49 is propped up by the bearing (diagram is omitted) for being set to shell 45 etc.
It holds.Cover 48 and shell 45 have opening portion in the part that drive shaft 49 passes through.The crescent gear pump 41 is via being formed in shell
The bolt fixing hole 50 of the flange 45b of body 45 is connected and fixed on the component of equipment body by bolt (diagram is omitted).
The external tooth of internal rotor 43 1 fewer than the internal tooth of outer rotor 42, internal rotor 43 is inscribed with aforementioned external teeth and above-mentioned internal tooth
And the eccentric state engaged is housed in outer rotor 42.Between the separation that each rotor contacts with each other, with trochoidal curve portion 44
Direction of rotation accordingly forms the chamber volume of suction side and discharge side.Main part 47 in the trochoidal curve receiving portion 46 of shell 45
Inner bottom surface 47c, the outlet for being formed with the suction inlet being connected to the chamber volume of suction side and being connected to the chamber volume of discharge side.
In the crescent gear pump 41, rotate trochoidal curve portion 44 by drive shaft 49, so that liquid is from suction inlet quilt
It is drawn into the suction side chamber volume that volume increases and becomes negative pressure.The suction side chamber volume become due to trochoidal curve portion 44 rotate and
The discharge side chamber volume that volume reducing, internal pressure rise, the liquid being inhaled into are discharged to outlet from the discharge side chamber volume.On
The pumping action stated continuously is carried out by the rotation in trochoidal curve portion 44, and liquid is by continuously force feed.Also, using due to being inhaled
The liquid entered and the hydraulic seal for improving the airtightness of each chamber volume, the pressure difference generated between each chamber volume become larger, can obtain
To big pumping action.
Trochoidal curve receiving portion 46 (main part 47 and cover 48) is sintering metal system, and shell 45 is the injection of resin combination
Formed body.Trochoidal curve receiving portion 46 and shell 45 configure trochoidal curve receiving portion 46 simultaneously in mold in the injection moulding of shell 45
It is integrated (insert molding) by composite molding.If as construction from the point of view of, be constitute shell 45 resin a part into
Enter sintered microporous a part of the outer surface to the trochoidal curve receiving portion as sintered body, connect securely using anchoring effect
The state of conjunction.
In mode shown in Fig. 5, shell 45 is formed as the main part 47 for not only covering trochoidal curve receiving portion 46, also covers
Cover 48.In order to use which, during fabrication, firstly, being inserted from the opening portion side 47a by the 42 groups of merging of internal rotor 43 and outer rotor
Enter to after the main part 47 of trochoidal curve receiving portion 46, cover cover 48, obtains the trochoidal curve receiving portion 46 including rotor.
Above-mentioned composite molding is configured in injecting molding die and carried out, forms shell 45 so as to cover 48 ground of cover.
Through this construction, it can prevent cover 48 from falling off from main part 47.
As the sintering metal material being able to use in the formation of trochoidal curve receiving portion 46, can enumerate iron series, copper and iron system,
Copper system, stainless steel system etc..It is excellent with the close property of resin-case because cheap, it is therefore preferable that using using iron as principal component
The sintering metal of (also can wrap cupric).In addition, being the sintering metal of principal component by using iron, higher machine can be also obtained
Tool intensity.In addition, copper is compared with iron, and poor with the close property (cementability) of resin, therefore, copper contains comprising copper
The amount of having is preferably 10 weight % or less.Further preferably, the amount of copper is 5 weight % or less.In addition, in force feed water, medical fluid
Deng trochoid pump in, it is preferred to use the high stainless steel system etc. of antirust ability.
As the sintering metal for constituting trochoidal curve receiving portion 46, it is preferable to use the sintering metal of non-impregnation oils.In addition, burning
In the case where the in-process use oil of the forming of knot metal or again repoussage shape (pressure-sizing processing), gone preferably by solvent cleaning etc.
In addition to the non-oil-impregnated sintered metal of oil.In addition, the theoretical density of sintering metal is than preferably 0.7~0.9.By making theoretical density
Than being 0.7~0.9, there can be the required compactness for ensuring the intensity of trochoidal curve receiving portion, and ensure to be used for
The concave-convex surface (sintered microporous) for being close to resin-case securely with the trochoidal curve receiving portion.
The adjustment of the receiving portion depth of trochoidal curve receiving portion 46 can be cut by the axial direction of the cylinder side wall to main part 47
Face carries out plane machining to execute, and can be easily adjusted by being machined.
Make the injection molded article of 45 resin combination of shell, discharge rate design can only by trochoidal curve receiving portion 46 come
It is adjusted, therefore, for pump shape etc., the freedom degree of design is widened.In addition, can be drawn liquid by resin combination
Cast gate 45a is integrally formed with shell 45.As needed, it can also will be used to prevent the mixed filter of foreign matter by deposition etc.
It is fixed on the end of the liquid sucking cast gate 45a of the access entrance (fluid intake) become until the chamber volume of suction side.
Formed shell 45 resin combination be using can injection molding synthetic resin as the resin combination of matrix resin
Object.As the matrix resin, such as plasticity polyimide resin, polyether ketone resin, polyether-ether-ketone (PEEK) tree can be enumerated
Rouge, polyphenylene sulfide (PPS) resin, polyamide-imide resin, polyamide (PA) resin, polybutylene terephthalate (PBT)
(PBT) resin, polyethylene terephthalate (PET) resin, polyethylene (PE) resin, polyacetal resin, phenolic resin etc..
These each resins both can be used alone, or the polymer alloy of two or more mixing.These heat-resistant resins it
In, because the creep resistant of formed body, load resistance, wear resistance, chemical resistance etc. are excellent, it is therefore especially preferred that making
Use PPS resin.
It is preferred that individually or suitably and with effective assigning high intensity, high resiliency, high dimensional accuracy, wear resistance
Anisotropic glass fibre, carbon fiber or the inorganic filler that removal injection moulding is shunk.Especially glass fibre and inorganic
Filler is used in combination, and economy is excellent, and friction and wear characteristic in the oil is excellent.
In the 2nd invention of the application, particularly preferably use using the PPS resin of straight chain type as matrix resin and in matrix tree
As resin combination made of filler cooperation glass fibre and bead in rouge.With this configuration, oil resistivity, chemically-resistant medicine
Moral character is excellent, excellent tenacity, and the anisotropy removal shunk by injection moulding makes the warpage of flange part become smaller, dimensional accuracy
Also it greatly improves.In addition, there is independent trochoidal curve receiving portion other than the structure, previous such rubber system is not needed
Sealing ring therefore can also be suitble to use under the hot environment as more than 120 DEG C.
The means these each raw material are mixed, mixed are not particularly limited, and can be mixed using Henschel mixer, ball
Machine, spiral ribbon mixer, Luo Dige mixing machine, super Henschel mixer etc. carry out dry type mixing to powder raw material, then utilize
The melt extruders such as double screw extruder carry out melting mixing, obtain molding pellet.In addition, the charging of packing material can also be with
When being mixed using meltings such as double screw extruders using lateral charging.It is shaped using the molding with pellet by being injection moulded
Shell.In forming, entire trochoidal curve receiving portion or only disposal subject portion are configured in mold, passes through composite molding one
Change.
In the crescent gear pump of the 2nd invention of the application, as outer rotor, internal rotor, preferably accommodated with trochoidal curve
Portion uses sintering metal (iron series, copper and iron system, copper system, stainless steel system etc.) in the same manner.
Illustrate the other embodiments of the crescent gear pump of the 2nd invention of the application according to Fig. 6.Fig. 6 is inside engaged gear
The axial sectional view of pump.As shown in fig. 6, in the crescent gear pump 41, the construction that exposes with cover 48 from shell 45.It removes
Structure except this is identical as crescent gear pump shown in fig. 5.It, can be to be received by trochoidal curve in mode shown in Fig. 6
Main part 47 is inserted into after 45 composite molding of main part 47 and shell in appearance portion 46, by each rotor, covers the step of cover 48
Manufacture.In addition, the case where with Fig. 5 is identical, can also be combined into after assembling the trochoidal curve receiving portion 46 including rotor with shell
Type.Main part 47 and cover 48 are by being fastened and fixed, without bolt fastening process etc., more simply, and can be secured
Ground is fixed.
Illustrate the other embodiments of the crescent gear pump of the 2nd invention of the application according to Fig. 7.Fig. 7 is inside engaged gear
The axial sectional view of pump.As shown in fig. 7, in the crescent gear pump 41 there is cover 48 and shell 45 to connect by bolt 51
The construction connect.It is close to as a result, in trochoidal curve receiving portion 46, main part 47 and cover 48.In addition to this structure with it is shown in fig. 5
Crescent gear pump is identical.In addition, as needed, metal bushing can also be made to be located in the flange part 45b of shell 45
Bolt fixing hole 50 is bolted across the bushing.In mode shown in Fig. 7, by trochoidal curve receiving portion 46
After 45 composite molding of main part 47 and shell, each rotor is inserted into main part 47.Later, can with by cover 48 relative to
The fixed step of 45 bolt of shell is manufactured.
More than, it is illustrated according to Fig. 5~Fig. 7, but the structure of the crescent gear pump of the 2nd invention of the application is not
It is defined in this.No matter in which mode, trochoidal curve receiving portion is all different components from shell, in advance by receiving portion depth height
Process to precision and by shell composite molding around the trochoidal curve receiving portion that manufactures, to have the knot for engaging two components
Structure.The deviation without the discharge rate between individual and the crescent gear pump with stable discharge ability are obtained as a result,.
Industrial availability
The crescent gear pump of the 1st invention and the 2nd invention of the application can be used as the liquid such as pressure oil, water, medical fluid
Crescent gear pump (trochoid pump) is particular enable to be suitable as to substitute freon, carbon dioxide etc. as refrigerant
Electric heater, room air conditioner, car air-conditioner scroll compressor sliding part supply liquid pump.
Description of symbols
1 crescent gear pump
2 outer rotors
3 internal rotors
4 trochoidal curve portions
5 shells
6 covers
7 bushings
8 metal plates
9 bolts
10 drive shafts
The fixed plate of 11 equipment bodies
12 sealing rings
13 filters
41 crescent gear pumps
42 outer rotors
43 internal rotors
44 trochoidal curve portions
45 shells
46 trochoidal curve receiving portions
47 main parts
48 covers
49 drive shafts
50 bolt fixing holes
51 bolts.
Claims (5)
1. a kind of crescent gear pump, the crescent gear pump has trochoidal curve portion, and the trochoidal curve portion is with multiple internal tooths
Outer rotor in, the internal rotor with multiple external tooths is rotated freely with the state of the external tooth and the interior tooth engagement and bias
Ground receiving, the suction side chamber volume drawn liquid into is formed between the internal tooth and the external tooth and will be inhaled into the suction
Enter the discharge side chamber volume of the liquid discharge of side chamber volume, which is characterized in that
The crescent gear pump has: having the shell for the recess portion for accommodating the trochoidal curve portion and occludes the institute of the shell
The cover of recess portion is stated, the shell is the injection molded article of resin combination,
The shell is bolted with the cover, has metal bushing in the bolt fixing hole part of the shell,
In the joint portion section of the shell and the cover, from the bottom surface of the recess portion, the cover side of the bushing
Endface position it is higher than the bushing forming face around the bushing of the shell, and with it is close around the recess portion of the shell
Cover is identical or lower than the sealing surface.
2. crescent gear pump according to claim 1, which is characterized in that
The sealing surface be from the continuous face of medial surface of the recess portion of the shell, be close to the surface of the cover and should
Concave seal.
3. crescent gear pump according to claim 1, which is characterized in that
The crescent gear pump is not in the joint portion sandwiched sealing ring of the shell and the cover.
4. crescent gear pump according to claim 1, which is characterized in that
The medial surface of the recess portion of the shell is made of the injection molded article of the resin combination, the bottom surface of the recess portion
It is made of metallic object.
5. crescent gear pump according to claim 1, which is characterized in that
The resin combination be using polyphenylene sulfide as matrix resin and in matrix resin cooperation from glass fibre, carbon fiber
Dimension and inorganic filler in select it is at least one kind of made of resin combination.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015193292A JP2017066976A (en) | 2015-09-30 | 2015-09-30 | Internal gear pump |
| JP2015-193292 | 2015-09-30 | ||
| JP2015-193242 | 2015-09-30 | ||
| JP2015193242A JP2017066975A (en) | 2015-09-30 | 2015-09-30 | Internal gear pump |
| CN201680057233.2A CN108138766B (en) | 2015-09-30 | 2016-09-29 | Internal gear pump |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680057233.2A Division CN108138766B (en) | 2015-09-30 | 2016-09-29 | Internal gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110360096A true CN110360096A (en) | 2019-10-22 |
Family
ID=58423734
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680057233.2A Expired - Fee Related CN108138766B (en) | 2015-09-30 | 2016-09-29 | Internal gear pump |
| CN201910756326.XA Pending CN110360096A (en) | 2015-09-30 | 2016-09-29 | Crescent gear pump |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680057233.2A Expired - Fee Related CN108138766B (en) | 2015-09-30 | 2016-09-29 | Internal gear pump |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20180274539A1 (en) |
| CN (2) | CN108138766B (en) |
| DE (1) | DE112016004484T5 (en) |
| WO (1) | WO2017057533A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210180591A1 (en) * | 2017-11-30 | 2021-06-17 | Ntn Corporation | Internal gear pump |
| US11027404B2 (en) * | 2018-07-19 | 2021-06-08 | Milwaukee Electric Tool Corporation | Lubricant-impregnated bushing for impact tool |
| US11448211B2 (en) | 2018-08-31 | 2022-09-20 | Toyoda Gosei Co., Ltd. | Oil pump including gap between flange portion of tubular core and flange-opposing portion of resin housing |
| JP7188342B2 (en) * | 2019-09-27 | 2022-12-13 | 豊田合成株式会社 | gear pump |
| WO2021124909A1 (en) * | 2019-12-19 | 2021-06-24 | Ntn株式会社 | Resin molding, resin foam molding, and scroll rotor |
| CN114616392B (en) * | 2019-12-24 | 2023-07-28 | 住友电工烧结合金株式会社 | Method for manufacturing rotor with cross-linked fluororesin coating |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5965963U (en) * | 1982-10-27 | 1984-05-02 | スズキ株式会社 | Connection device between engine cylinder and cylinder head |
| JPH0519730U (en) * | 1991-08-26 | 1993-03-12 | 三菱電線工業株式会社 | Sealing device |
| JPH09250640A (en) * | 1996-03-18 | 1997-09-22 | Sakagami Seisakusho:Kk | Seal ring |
| CN103804734A (en) * | 2014-02-25 | 2014-05-21 | 上海平泰橡胶制品有限公司 | Combined rubber sealing ring for drinking water pipeline joint and manufacturing method thereof |
| CN104520586A (en) * | 2012-08-08 | 2015-04-15 | Ntn株式会社 | Internal gear pump |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5095115B2 (en) * | 2006-03-27 | 2012-12-12 | Ｎｔｎ株式会社 | Hydrodynamic bearing device |
| JP6160195B2 (en) * | 2013-04-15 | 2017-07-12 | 株式会社ジェイテクト | Electric pump device |
| JP6271992B2 (en) * | 2013-12-13 | 2018-01-31 | Ntn株式会社 | Internal gear pump |
-
2016
- 2016-09-29 CN CN201680057233.2A patent/CN108138766B/en not_active Expired - Fee Related
- 2016-09-29 US US15/764,666 patent/US20180274539A1/en not_active Abandoned
- 2016-09-29 DE DE112016004484.4T patent/DE112016004484T5/en not_active Withdrawn
- 2016-09-29 WO PCT/JP2016/078755 patent/WO2017057533A1/en active Application Filing
- 2016-09-29 CN CN201910756326.XA patent/CN110360096A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5965963U (en) * | 1982-10-27 | 1984-05-02 | スズキ株式会社 | Connection device between engine cylinder and cylinder head |
| JPH0519730U (en) * | 1991-08-26 | 1993-03-12 | 三菱電線工業株式会社 | Sealing device |
| JPH09250640A (en) * | 1996-03-18 | 1997-09-22 | Sakagami Seisakusho:Kk | Seal ring |
| CN104520586A (en) * | 2012-08-08 | 2015-04-15 | Ntn株式会社 | Internal gear pump |
| CN103804734A (en) * | 2014-02-25 | 2014-05-21 | 上海平泰橡胶制品有限公司 | Combined rubber sealing ring for drinking water pipeline joint and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE112016004484T5 (en) | 2018-06-14 |
| US20180274539A1 (en) | 2018-09-27 |
| CN108138766B (en) | 2020-03-31 |
| WO2017057533A1 (en) | 2017-04-06 |
| CN108138766A (en) | 2018-06-08 |
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