CN101338746A - Internal gear pump - Google Patents
Internal gear pump Download PDFInfo
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- CN101338746A CN101338746A CNA2008101272949A CN200810127294A CN101338746A CN 101338746 A CN101338746 A CN 101338746A CN A2008101272949 A CNA2008101272949 A CN A2008101272949A CN 200810127294 A CN200810127294 A CN 200810127294A CN 101338746 A CN101338746 A CN 101338746A
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Abstract
An internal gear pump which has a crescent disposed between an outer rotor and an inner rotor having a trochoidal tooth profile, and which reduces vibrations caused by pulsations generated when the fluid is discharged. The internal gear pump has an outer rotor (2) having internal teeth (21) formed therein, an inner rotor (1) disposed on the inner peripheral side of the outer rotor and having formed therein external teeth (11) that mesh with the internal teeth (21), and a crescent (3) disposed in a clearance between the outer rotor (2) and the inner rotor (1). Pitch spacings (Pa) of the external teeth (11) of the inner rotor (1) are formed as non-equal spacings, and pitch spacings (Pb) of the internal teeth of the outer rotor (2) correspond to the pitch spacings (Pa) of the external teeth (11) of the inner rotor.
Description
Technical field
The present invention relates to a kind of crescent gear pump, possess the crescent moon body that is configured between external rotor and the internal rotor, and possess internal rotor, can alleviate the vibration that produces because of the pulsation that takes place when the sending of fluid with cycloidal tooth profile.
Background technique
Crescent gear pump with crescent moon body (crescent shape object) can improve head pressure owing to comparing with the crescent gear pump that does not use the crescent moon body, so can use chronically.And then Recent study goes out to have the crescent gear pump of crescent moon body can realize the raising of further efficient and the increase of head pressure by the rotor that uses cycloidal tooth profile.But, in this exploitation, want the raising of implementation efficiency and discharging performance, the peak value of then discharging pulsation is high more, has the vibration of pump main body to increase, also bring dysgenic problem to peripheral equipment.
In the crescent gear pump of crescent moon build, have in the pump of rotor of cycloid shape in use, in order further to improve head pressure, the problems referred to above are compared with the past to receive publicity more significantly.As the technology of the peak value that reduces such discharge pulsation, can enumerate patent documentation 1.
[patent documentation 1] spy opens flat 7-253083 communique
In patent documentation 1, though that profile of tooth etc. do not have is specific, in only making the tooth structure different mutually with the pitch interval of tooth, might take place can not be fully or reduce the situation of the peak value of discharging pulsation effectively.In addition, patent documentation 1 has only been spoken of the reduction of noise level acoustically, about the not solution of technology of other the efficient and the raising of discharging performance etc.And then, do not have any description about concrete discharge pulsation reduction method, be unclear about concrete discharge pulsation reduction method.
Summary of the invention
The discharge capacity that the objective of the invention is to make liquid is not pulsation peak value, the vibration that reduces pump and noise a certain amount of, that take place when being reduced in the sending of fluid.
So, the inventor has carried out research with keen determination repeatedly in order to address the above problem, the result, the invention of technological scheme 1 is a kind of crescent gear pump, comprise the external rotor that is formed with internal tooth, be configured in interior all sides of this external rotor and be formed with the internal rotor of the external tooth of above-mentioned internal tooth engagement and be configured in crescent moon body in the gap of above-mentioned external rotor and internal rotor, each pitch interval of above-mentioned internal rotor forms unequal interval, the pitch interval of the internal tooth of above-mentioned external rotor is corresponding with the pitch interval of the external tooth of above-mentioned internal rotor, has solved the problems referred to above thus.
The crescent gear pump of technological scheme 2 is in said structure, to be listed as the unequal interval pitch for the row of the number of teeth of the common divisor of the number of teeth of the internal tooth of the number of teeth of the external tooth of internal rotor and external rotor, repeat to form same unequal interval pitch row, solved the problems referred to above thus.The crescent gear pump of technological scheme 3 is in said structure, and the number of teeth of above-mentioned unequal interval pitch row is more than 3, has solved the problems referred to above thus.The crescent gear pump of technological scheme 4 is in said structure, and the number of teeth of above-mentioned internal rotor is more than 6, and the number of teeth of external rotor is more than 9, has solved the problems referred to above thus.The crescent gear pump of technological scheme 5 is in said structure, and the size of each external tooth of unequal interval pitch row and the transverse tooth thickness of internal tooth is set at difference, has solved the problems referred to above thus.The crescent gear pump of technological scheme 6 is in said structure, and the profile of tooth of above-mentioned internal rotor is a cycloidal tooth profile, has solved the problems referred to above thus.
The invention of technological scheme 7 is a kind of crescent gear pumps, comprise the external rotor that is formed with internal tooth, be configured in interior all sides of this external rotor and be formed with the internal rotor of the external tooth of above-mentioned internal tooth engagement and be configured in crescent moon body in the gap of above-mentioned external rotor and internal rotor, the transverse tooth thickness size of each external tooth of above-mentioned internal rotor forms non-homogeneous, the transverse tooth thickness of each internal tooth of above-mentioned external rotor is corresponding with the transverse tooth thickness size of above-mentioned internal rotor, has solved the problems referred to above thus.
The crescent gear pump of technological scheme 8 is in said structure, the number of teeth of the number of teeth of the external tooth of internal rotor and the internal tooth of external rotor is the multiple of the common divisor of two numbers of teeth, in the external tooth of above-mentioned internal rotor, possesses denture outside a plurality of units, denture is the number of teeth row of greatest common divisor at least and possesses different transverse tooth thickness respectively outside the described unit, on above-mentioned external rotor, possess denture in the unit that the corresponding internal tooth of denture forms continuously outside the unit of a plurality of and above-mentioned internal rotor, solved the problems referred to above thus.
The crescent gear pump of technological scheme 9 is in said structure, and the number of teeth of denture is more than 3 outside the unit of above-mentioned internal rotor, has solved the problems referred to above thus.The crescent gear pump of technological scheme 10 is in said structure, and the number of teeth of above-mentioned internal rotor is more than 6, and the number of teeth of external rotor is more than 9, has solved the problems referred to above thus.The crescent gear pump of technological scheme 11 is in said structure, and the profile of tooth of above-mentioned internal rotor is a cycloidal tooth profile, has solved the problems referred to above thus.
The crescent gear pump of technological scheme 12 is in said structure, and the pitch angle of the external tooth of above-mentioned internal rotor is uneven, and the pitch angle of each internal tooth of above-mentioned external rotor is corresponding with the pitch angle of aforementioned external teeth, has solved the problems referred to above thus.The crescent gear pump of technological scheme 13 is in said structure, the pitch angle of the external tooth of denture is uneven outside the unit of above-mentioned internal rotor, and the pitch angle of the internal tooth of denture is corresponding with the pitch angle of denture outside the above-mentioned unit in the unit of above-mentioned external rotor, has solved the problems referred to above thus.
Invention according to technological scheme 1, be provided with in the crescent gear pump of crescent moon body (crescent parts) at the position, space of external rotor and internal rotor, the pitch interval of the external tooth by making internal rotor is different mutually, the size of the cell by internal rotor during with discharge that external rotor forms is also different, the discharge capacity that each cell is carried becomes irregular, the peak value of discharging pulsation reduces, and can further reduce acoustically noise level and vibration.
Invention according to technological scheme 2, to be listed as the unequal interval pitch for the row of the number of teeth of the common divisor of the number of teeth of the internal tooth of the number of teeth of the external tooth of internal rotor and external rotor, repeat to form same unequal interval pitch row, thereby produce the irregular discharge state of the discharge capacity of non-homogeneous (inhomogeneous) periodically continuously, can further reduce the peak value of discharging pulsation.According to the invention of technological scheme 2, by the envoy apart from interval cycle be more than 3, can make the different pitch interval more than 3 continuous, can the envoy more complicated apart from the cycle at interval, can make the irreqularity of discharging pulsation become bigger.
According to the invention of technological scheme 4, the number of teeth by above-mentioned internal rotor is more than 6, and the number of teeth of external rotor is more than 9, and the common divisor that can make the number of teeth of internal rotor and external rotor is more than 3, can realize irregular different discharge state more than 3.The invention of technological scheme 5 is set at difference by the size with the transverse tooth thickness of each external tooths of unequal interval pitch row and internal tooth, become the irregular pulsation that the pitch of unequal interval is brought, and the irregular pulsation that brings of the cell that utilizes continuously different transverse tooth thickness can produce different sizes.According to the invention of technological scheme 6, be cycloidal tooth profile by the profile of tooth that makes internal rotor, can in the peak value that reduces pulsation, improve discharging performance.
In the invention of technological scheme 7, form non-homogeneous by transverse tooth thickness size with each external tooth of above-mentioned internal rotor, and the transverse tooth thickness of each internal tooth of above-mentioned external rotor is corresponding with the transverse tooth thickness size of above-mentioned internal rotor, the transverse tooth thickness size difference of each external tooth of internal rotor is different with the spatial volume (volume) that the crescent moon body surrounds by adjacent outer between cog.In external rotor, also be the transverse tooth thickness size difference of each internal tooth, different by adjacent interior between cog with the spatial volume (volume) that the crescent moon body surrounds.Thus, the varying in size of the cell the during discharge that forms by internal rotor and external rotor, the conveying discharge capacity of each cell becomes irregular, can reduce the peak value of discharging pulsation, further reduce acoustically noise level and vibration.
In the invention of technological scheme 8, the number of teeth of the number of teeth of the external tooth of internal rotor and the internal tooth of external rotor is the multiple of the common divisor of two numbers of teeth, possessing a plurality of in the external tooth of above-mentioned internal rotor is denture outside the number of teeth row of greatest common divisor and the unit that possesses different transverse tooth thickness respectively at least, on above-mentioned external rotor, possesses denture in the unit that the corresponding internal tooth of denture forms continuously outside the unit of a plurality of and above-mentioned internal rotor, constitute outside the above-mentioned unit denture in the denture and unit thus, periodically recur the irregular discharge state of discharge capacity, can further reduce the peak value of discharging pulsation.
Classify crescent gear pump more than 3 as by the unit external tooth of the invention of technological scheme 9 being made above-mentioned internal rotor, can make the external tooth of the different transverse tooth thickness size more than 3 continuous, structure that can the outer denture of the unit of making becomes more complicated, can further increase the irreqularity of discharging pulsation.By the number of teeth of the invention of technological scheme 10 being made above-mentioned internal rotor be more than 6, the number of teeth of external rotor is the crescent gear pump more than 9, the common divisor that can make the number of teeth of internal rotor and external rotor is more than 3, can realize irregular different discharge state more than 3.In the invention of technological scheme 11, be cycloidal tooth profile by the profile of tooth that makes above-mentioned internal rotor, can in the peak value that reduces pulsation, improve discharging performance.
In the invention of technological scheme 12, the pitch angle of the external tooth of above-mentioned internal rotor is uneven, and the pitch angle of each internal tooth of above-mentioned external rotor is corresponding with the pitch angle of aforementioned external teeth, thus can the outer denture of the unit of making and unit in the structure of denture become more complicated, can further reduce the peak value of discharging pulsation.In the invention of technological scheme 13, the pitch angle of the external tooth of denture is uneven outside the unit of above-mentioned internal rotor, and the pitch angle of the internal tooth of denture is corresponding with the pitch angle of denture outside the above-mentioned unit in the unit of above-mentioned external rotor, thus can the outer denture of the unit of making and unit in the structure of denture become more complicated, can further reduce the peak value of discharging pulsation.
Description of drawings
Fig. 1 (A) is the plan view of expression structure of the present invention, and Fig. 1 (B) is assembled in plan view on the external rotor with internal rotor and crescent moon body.
Fig. 2 (A) is the plan view of internal rotor, and Fig. 2 (B) is the plan view of external rotor, and Fig. 2 (C) is the plan view of crescent moon body.
Fig. 3 (A) is the trip map of position of any external tooth of expression internal rotor entry into service, and Fig. 3 (B) is the trip map after any external tooth moves 1 tooth.
Fig. 4 (A) is the trip map that any external tooth arrives the crescent moon body, and Fig. 4 (B) is the trip map of the state of any external tooth central authorities of arriving the crescent moon body.
Fig. 5 (A) is the trip map of the state of any external tooth end side of arriving the crescent moon body, the trip map of Fig. 5 (B) state that to be any external tooth leave from the crescent moon body.
Fig. 6 (A) is the assembling assumption diagram of the rotor of the 2nd mode of execution of the present invention, and Fig. 6 (B) is the plan view of the external rotor of the 2nd mode of execution.
Fig. 7 (A) is the plotted curve of expression discharge pulsation of the present invention, and Fig. 7 (B) represents the plotted curve of the discharge pulsation of type in the past.
Fig. 8 (A) is the plan view of structure of expression the 2nd mode of execution of the present invention, and Fig. 8 (B) is assembled in plan view on the external rotor with internal rotor and crescent moon body.
Fig. 9 (A) is the plan view of internal rotor, and Fig. 9 (B) is the plan view of external rotor, and Fig. 9 (C) is the plan view of crescent moon body.
Figure 10 (A) is the trip map of position of any external tooth of the internal rotor entry into service of expression the 2nd mode of execution of the present invention, and Figure 10 (B) is the trip map after any external tooth moves 1 tooth.
Figure 11 (A) is the trip map that any external tooth of the 2nd mode of execution of the present invention arrives the crescent moon body, and Figure 11 (B) is the trip map of the state of any external tooth central authorities of arriving the crescent moon body.
Figure 12 (A) is the trip map of the state of any external tooth of the 2nd mode of execution of the present invention end side of arriving the crescent moon body, the trip map of Figure 12 (B) state that to be any external tooth leave from the crescent moon body.
Figure 13 (A) is the plan view of the internal rotor of the 3rd mode of execution of the present invention, and Figure 13 (B) is the plan view of external rotor, and Figure 13 (C) is the plan view of crescent moon body.
Figure 14 (A) is the trip map of position of any external tooth of the internal rotor entry into service of expression the 3rd mode of execution of the present invention, and Figure 14 (B) is the trip map after any external tooth moves 1 tooth.
Figure 15 (A) is the trip map that any external tooth of the 3rd mode of execution of the present invention arrives the crescent moon body, and Figure 15 (B) is the trip map of the state of any external tooth central authorities of arriving the crescent moon body.
Figure 16 (A) is the trip map of the state of any external tooth of the 3rd mode of execution of the present invention end side of arriving the crescent moon body, the trip map of Figure 16 (B) state that to be any external tooth leave from the crescent moon body.
Description of reference numerals
1... internal rotor
11... external tooth
2... external rotor
21... internal tooth
3... crescent moon body
Pa... pitch interval
Pb... pitch interval
Za... the number of teeth
Zb... the number of teeth
Pi... the unequal interval pitch is listed as
Po... the unequal interval pitch is listed as
Li... denture outside the unit
Lo... denture in the unit
Embodiment
Below, based on the description of drawings embodiments of the present invention.The structure of the 1st mode of execution of the present invention mainly is made of internal rotor 1, external rotor 2, crescent moon body 3 and pump case 4 shown in Fig. 1 (A).Pump case 4 is formed with rotor chamber 41, inhalation port 42 and discharges port 43.And above-mentioned inhalation port 42 and discharge port 43 are formed with the stream of the outside that is communicated to pump case 4 respectively.In addition, said pump housing 4 is diagram not, but uses with case cover.
Then, above-mentioned internal rotor 1 shown in Fig. 2 (A), outer circumferential side be formed with a plurality of external tooths 11,11 ....This external tooth 11 forms the profile of tooth (also comprising the roughly profile of tooth of cycloid shape) of cycloid shape sometimes.Between aforementioned external teeth 11,11, be formed with tooth bottom 12.The interval of adjacent external tooth 11,11, to be that pitch interval Pa is set at respectively different, are set in the back narration for this different pitch interval Pa.
Above-mentioned external rotor 2 shown in Fig. 2 (B), interior all sides be formed with a plurality of internal tooths 21,21 ..., above-mentioned internal tooth 21,21 ... between be formed with tooth bottom 22.Above-mentioned internal rotor 1 is configured in interior all sides of above-mentioned external rotor 2, the external tooth 11,11 of above-mentioned internal rotor 1 ... with the internal tooth 21,21 of above-mentioned external rotor 2 ... engagement.Equally, the internal tooth 21,21 of above-mentioned external rotor 2 ... pitch interval Pb corresponding to the external tooth 11,11 of internal rotor 1 ... pitch interval Pa and form so that can with the external tooth 11,11 of above-mentioned internal rotor 1 ... engagement well.In addition, under the situation of cycloidal tooth profile (also comprising the roughly profile of tooth of cycloid shape), the internal tooth 21 of above-mentioned external rotor 2 is also made the profile of tooth that the external tooth 11 with above-mentioned internal rotor 1 meshes well at the external tooth 11 of above-mentioned internal rotor 1.Like this, form cycloidal tooth profile (also comprising roughly cycloidal tooth profile), can in the peak value that reduces pulsation, improve discharging performance by external tooth 11 with above-mentioned internal rotor 1.
Crescent moon body 3 inserts and to be configured in the gap that is formed between above-mentioned external rotor 2 and the internal rotor 1 as shown in Figure 1.This gap is meant the space of the roughly first quarter moon shape between the periphery of the interior all sides that are formed on above-mentioned external rotor 2 and above-mentioned internal rotor 1.Above-mentioned crescent moon body 3 is roughly first quarter moon shape or arcuation shown in Fig. 2 (C), be made of arcuation concave side 31 and arcuation convex side 32.
The external tooth 11,11 of the arcuation concave side 31 of above-mentioned crescent moon body 3 and internal rotor 1 ... between be formed with inboard cell Sa (with reference to Fig. 1 (B)).Equally, the internal tooth 21,21 of the arcuation convex side 32 of above-mentioned crescent moon body 3 and external rotor 2 ... between be formed with outside cell Sb (with reference to Fig. 1 (B)).Above-mentioned inboard cell Sa is formed in the gap part in the part of being surrounded by the arcuation concave side 31 of the external tooth 11,11 of internal rotor 1 and crescent moon body 3, above-mentioned outside cell Sb be formed in by internal tooth 21,21 ... the gap part in the part of surrounding with the arcuation convex side 32 of crescent moon body 3.
The external tooth 11,11 of above-mentioned internal rotor 1 ... with the internal tooth 21,21 of above-mentioned external rotor 2 ... the relation decision of structure by as shown below.At first, a plurality of external tooths 11,11 of above-mentioned internal rotor 1 ... in, each pitch interval Pa, Pa of each adjacent external tooth 11,11 ... form unequal interval.And, the internal tooth 21,21 of above-mentioned external rotor 2 ... pitch interval Pb corresponding to the external tooth 11,11 of above-mentioned internal rotor 1 ... pitch interval Pa, so that external tooth 11,11 ... with internal tooth 21,21 ... engagement, these pitch interval Pb, Pb ... also different.
The size of pitch interval Pa has determined the size of the scope of the tooth bottom 12 between the adjacent external tooth 11,11 by the pitch angle decision of adjacent external tooth 11,11.And, between adjacent external tooth 11,11, and be the center with the tooth between adjacent external tooth 11,11 bottom 12, be provided with the inter-proximal areas 13 (with reference to Fig. 1 (B), Fig. 2 (A)) that constitutes above-mentioned inboard cell Sa.This inter-proximal areas 13 is equal with corresponding above-mentioned pitch interval Pa.Particularly, shown in Fig. 2 (A), establish internal rotor 1 suitable 3 external tooths 11,11 ... the pitch angle be α 1, γ 1, β 1, the magnitude relationship of establishing its pitch interval Pa is α 1＜γ 1＜β 1.α 1, the γ 1 of this inter-proximal areas 13 and above-mentioned pitch angle, the magnitude relationship of β 1 is corresponding and be called 13 α, 13 γ and 13 β (with reference to Fig. 2 (A).
Thus, the size in this zone is 13 α＜13 γ＞13 β.That is, the zone according to the sense of rotation of internal rotor 1 become little (13 α), big (13 γ), in the order of (13 β).And, be formed on each inboard cell Sa, Sa between above-mentioned internal rotor 1 and the above-mentioned crescent moon body 3 ... each volume also different, in its volume, have difference in size.Thereby the amount of the liquid of being transferred by a plurality of inboard cell Sa changes according to inboard cell Sa.
In addition, the internal tooth 21,21 of above-mentioned external rotor 2 ... each pitch interval Pb corresponding to the external tooth 11,11 of internal rotor 1 ... each pitch interval Pa so that engagement.By such structure, make the volume of the inboard cell Sa that forms by internal rotor 1, external rotor 2 and crescent moon body 3 and outside cell Sb different, discharge capacity changes according to cell (inboard cell Sa, outside cell Sb), reduce to discharge the peak value of pulsation, further realize acoustically noise level and the reduction of vibration.
Define as follows above-mentioned internal rotor 1 external tooth 11,11 ... with the internal tooth 21,21 of external rotor 2 ... pitch interval.At first, will for the external tooth 11,11 of above-mentioned internal rotor 1 ... tooth number Z a and the internal tooth 21,21 of external rotor 2 ... the number of teeth of numerical value of N of common divisor of tooth number Z b be listed in internal rotor 1 side as unequal interval pitch row Pi, repeat to form same unequal interval pitch row Pi (with reference to Fig. 2 (A)).That is, in an internal rotor 1, include a plurality of unequal interval pitch row Pi.
But under the identical situation of the tooth number Z a of the numerical value of N of the tooth number Z a of internal rotor 1 and the greatest common divisor of the tooth number Z b of external rotor 2 and internal rotor 1, unequal interval pitch row Pi only is one on internal rotor 1.As such mode of execution, as shown in Figure 6, the tooth number Z a that is internal rotor 1 is 6, the tooth number Z b of external rotor 2 is 12 situation.At this moment, 6 of the tooth number Z a of internal rotor 1 is greatest common divisors, and on internal rotor 1, unequal interval pitch row Pi is one.And, in the case, the external tooth 11,11 of internal rotor 1 ... pitch interval Pa all mutually different.
In above-mentioned unequal interval pitch row Pi, with different pitch interval Pa by above-mentioned (common divisor) numerical value of N external tooth 11,11 ... form 1 unit (group).And in unequal interval pitch row Pi, each pitch interval Pa is according to large, medium and small variation of above-mentioned pitch angle (α, β, γ), and the inter-proximal areas 13 in the unequal interval pitch row Pi also changes.In addition, interior a plurality of these inter-proximal areas 13,13 in the unequal interval pitch row Pi ... size and put in order preferably irregular (at random).But the size sequence of inter-proximal areas 13 in internal rotor 1, a plurality of unequal interval pitch row Pi is all formed by identical style.In above-mentioned external rotor 2, exist with above-mentioned unequal interval pitch row Pi equally by (common divisor) numerical value of N internal tooth 21,21 ... with the unequal interval pitch row Po of different pitch interval Pb formations.
Then, the numerical value of N of tooth number Z a, tooth number Z b and common divisor being made as concrete integer value describes.If the tooth number Z a of internal rotor 1 is 6, the tooth number Z b that establishes external rotor 2 is 9.The common divisor of tooth number Z a and tooth number Z b (numerical value of N) is " 3 ".This numerical value is according to the numerical value of tooth number Z a and tooth number Z b, sometimes greatest common divisor not necessarily.Unequal interval pitch row Pi by be different pitch interval Pa 3 external tooths 11,11 ... constitute.By these 3 external tooths 11,11 ... 3 inter-proximal areas 13,13 of setting ... constitute by 3 different pitch angles, as mentioned above, be α 1, β 1, γ 1.If its magnitude relationship is made as α 1＜γ 1＜β 1 as described above, then the magnitude relationship in the zone of its inter-proximal areas 13 is 13 α＜13 γ＜13 β (with reference to Fig. 2 (A)).
And then, the unequal interval pitch row Po of above-mentioned external rotor 2 with different pitch interval Pb by three internal tooths 21,21 ... constitute, by these 3 internal tooths 21,21 ... the inter-proximal areas 23,23 of formation ... constitute by 3 pitch angles, as mentioned above, be α 2, β 2, γ 2.A plurality of inter-proximal areas 23,23 of these unequal interval pitch row Po ... size order be in the unequal interval pitch row Pi with internal rotor 1 inter-proximal areas 13,13 ... the identical style of size order.In above-mentioned internal rotor 1, there are two unequal interval pitch row Pi, in external rotor 2, there are 3 unequal interval pitch row Po (with reference to Fig. 2 (B)).
In each unequal interval pitch row Pi and unequal interval pitch row Po, the individual external tooth 11,11 of existence 3 (common divisors) ... and internal tooth 21,21 ....In addition, the size order of inter-proximal areas 13 and inter-proximal areas 23 and arrangement mode can be suitably irregular.For example, also can be according to the sense of rotation of rotor, with inter-proximal areas 13,13 ... the size order of pitch angle (α, β, γ) be made as little, in, big or be made as big, medium and small.But, the inter-proximal areas 23,23 of the unequal interval pitch row Po of external rotor 2 ... size order identical with above-mentioned unequal interval pitch row Pi.
By making such structure, move with different pitch interval Pa (Pb) by external tooth 11 (internal tooth 21), the cycle of the size of the volume of the inboard cell Sa (outside cell Sb) that is formed by the inter-proximal areas 13 (23) of different sizes can not change monotonously, and becomes non-monotonously change.Thus, can realize the discharge pulsation that irregular (randomness) property is bigger.So-called non-monotonously change is meant by irregular pitch interval Pa (Pb), the inter-proximal areas 13 (23) that varies in size and moves in set position with the irregular cycle.
Fig. 3 to Fig. 5 be illustrated in internal rotor 11 week of rotation during in, because of the different inboard cell Sa of pitch angle different inter-proximal areas 13 α, 13 β, 13 γ or inter-proximal areas 23 α, 23 β, 23 γ volumes and outside cell Sb successively to the state of discharging the action that port 43 discharges.On the external tooth arbitrarily 11 of internal rotor 1, have dark circles, to shown in Figure 5, represent the state of external tooth 11 rotations of this dark circles as Fig. 3.
In addition, the external tooth of arranging with irregular pitch interval Pa 11,11 among the unequal interval pitch row Pi ... shape size, be that transverse tooth thickness size Wa is different respectively, as mentioned above, external tooth 11,11 ... the middle difference that has size, the volume of inboard thus cell Sa also change (with reference to Fig. 2 (A)) sometimes.Equally, the internal tooth 21,21 of the external rotor of arranging with irregular pitch interval Pb among the unequal interval pitch row Po ... shape size, be that transverse tooth thickness size Wb is different respectively, as mentioned above, internal tooth 21,21 ... the middle difference that has size, the volume of outside cell Sb also changes thus.
Fig. 6 is that to make the tooth number Z a of internal rotor 1 be 6, make the tooth number Z b of external rotor 2 be 12 structure.And the numerical value of the common divisor of tooth number Z a and tooth number Z b is 6, and the quantity of the unequal interval pitch row Po of the external rotor 2 of Xing Chenging is 2 thus.That is, the numerical value of above-mentioned common divisor equates with the tooth number Z a of internal rotor 1.In addition, Fig. 7 (A) is the plotted curve of expression discharge pulsation of the present invention, and Fig. 7 (B) is the figure of the discharge pulsation of expression conventional art.If relatively this plotted curve then demonstrates the present invention and disperses to make the peak value of discharging pulsation to reduce (with reference to Fig. 7 (A)) by making pulsation.
Then, based on Fig. 8 to Figure 12 the 2nd mode of execution of the present invention is described.In the 2nd mode of execution, in by the crescent gear pump that constitutes with the same structure of the 1st mode of execution of the present invention, shown in Fig. 9 (A), each external tooth 11,11 of above-mentioned internal rotor 1 ... the transverse tooth thickness size Wa of transverse tooth thickness be uneven.In addition, a plurality of external tooths 11,11 of above-mentioned internal rotor 1 ... in, pitch angle θ a, the θ a of each adjacent external tooth 11,11 ... all form equal angles (with reference to Fig. 8 (B), Fig. 9 (A)).That is, external tooth 11,11 ... pitch interval Pa be uniform.Each internal tooth 21,21 of above-mentioned external rotor 2 ... transverse tooth thickness size Wb corresponding to the transverse tooth thickness size Wa of above-mentioned internal rotor 1 but heterogeneous.Here, the meaning of " correspondence ", be as crescent gear pump, external rotor 2 internal tooth 21,21 ... with respect to the external tooth 11,11 of internal rotor 1 ... mesh, make above-mentioned internal rotor 1 can to rotate (with reference to Figure 10 to Figure 12) well with external rotor 2.
The transverse tooth thickness size Wa of the external tooth 11 of above-mentioned internal rotor 1 is the size (with reference to Fig. 9 (A)) of the part of intersecting with benchmark pitch circle Ca.This benchmark pitch circle Ca be the diameter center with internal rotor 1 be the center, by the crown of aforementioned external teeth 11 and the imaginary circles in the neutral position at the bottom of the tooth.According to the transverse tooth thickness size Wa of each external tooth 11, the shape difference of the tooth bottom 12 that each adjacent external tooth is 11,11.Thus, each adjacent external tooth 11,11 of above-mentioned internal rotor 1 and be formed on and above-mentioned crescent moon body 3 between each inboard cell Sa, Sa ... each volume also different, in this volume, have difference in size.Thereby the amount of the liquid of being transferred by a plurality of inboard cell Sa changes according to inboard cell Sa.In addition, in above-mentioned external rotor 2, also there is benchmark pitch circle Ca (with reference to Fig. 9 (B)).
The different external tooth 11,11 of each transverse tooth thickness size Wa of above-mentioned internal rotor 1 ... in, the external tooth 11,11 of internal rotor 1 ... tooth number Z a and the internal tooth 21,21 of above-mentioned external rotor 2 ... tooth number Z b be the multiple of the common divisor of two numbers of teeth.In the external tooth 11 of above-mentioned internal rotor 1, constitute the number of teeth row that constitute by the number of greatest common divisor at least, the external tooth 11 of these number of teeth row possesses different transverse tooth thickness size Wa respectively, so these number of teeth row are called denture Li outside the unit (with reference to Fig. 9 (A)).Denture Li by the numerical value of N of (maximum) common divisor, be that N external tooth 11 constitutes, repeats formation with denture Li this unit outside as mentioned above outside this unit.That is, in an internal rotor 1, comprise denture Li outside a plurality of units.
Under the identical situation of the tooth number Z a of the numerical value of N of the tooth number Z a of internal rotor 1 and the greatest common divisor of the tooth number Z b of external rotor 2 and internal rotor 1, in above-mentioned internal rotor 1, has only the situation of denture Li outside the above-mentioned unit sometimes.For example, be that the tooth number Z a of above-mentioned internal rotor 1 is 6, the tooth number Z b of external rotor 2 is 12.At this moment, 6 of the tooth number Z a of above-mentioned internal rotor 1 is greatest common divisors, in internal rotor 1, only constitute by denture Li outside the unit, in the case, external tooth 11,11 ... transverse tooth thickness size Wa all mutually different.
Be included in a plurality of external tooths among the denture Li 11,11 outside the above-mentioned unit ... separately transverse tooth thickness size Wa, Wa ... size and put in order preferably irregular (at random).But the size of the transverse tooth thickness size Wa outside a plurality of units in internal rotor 1 among the denture Li and putting in order is all formed by identical style.In above-mentioned external rotor 2, be provided with above-mentioned unit outside denture Li equally by (common divisor) numerical value of N internal tooth that transverse tooth thickness size Wb is different 21,21 ... denture Lo in the unit of formation (with reference to Fig. 9 (B)).That is, so-called internal rotor 1 and external rotor 2 engagements and rotation correctly are meant that denture Lo meshes (with reference to Fig. 8 (A), Fig. 9 to Figure 12) periodically in the unit of denture Li and external rotor 2 outside the unit of internal rotor 1.
Then, the numerical value of N of above-mentioned common divisor is made as concrete integer value, the tooth number Z a of internal rotor 1 and the tooth number Z b of external rotor 2 are described.If the tooth number Z a of internal rotor 1 is 6, the tooth number Z b of external rotor 2 is 9 (with reference to Fig. 9 (A), Fig. 9 (B)).The common divisor of tooth number Z a and tooth number Z b (numerical value of N) is " 3 ".In addition, this numerical value " 3 " is according to the numerical value of tooth number Z a and tooth number Z b, sometimes greatest common divisor not necessarily.Outside the unit denture Li by 3 external tooths 11,11 that have different transverse tooth thickness size Wa respectively ... constitute.Here, for 3 external tooths 11,11 among the outer denture Li of the unit of being included in ... transverse tooth thickness size Wa, respectively different in order to demonstrate size, be called transverse tooth thickness size Wa1, transverse tooth thickness size Wa2, transverse tooth thickness size Wa3.And the magnitude relationship of this transverse tooth thickness size is, to make transverse tooth thickness size Wa1 be overall dimensions, make transverse tooth thickness size Wa3 is minimum dimension.That is, the magnitude relationship of transverse tooth thickness size is Wa1＞Wa2＞Wa3 (with reference to Fig. 9 (A)).
And then, in the unit of above-mentioned external rotor 2 denture Lo by 3 internal tooths 21,21 that have different transverse tooth thickness size Wb respectively ... constitute.For be included in the internal tooth among the denture Lo 21,21 in this unit ..., also different and be called transverse tooth thickness size Wb1, transverse tooth thickness size Wb2, transverse tooth thickness size Wb3 in order to demonstrate separately transverse tooth thickness size Wb.Like this, in above-mentioned internal rotor 1, have denture Li, Li outside two units, in external rotor 2, have denture Lo, Lo in 3 units ... (with reference to Fig. 9 (A), Fig. 9 (B)).
And, the external tooth 11 of transverse tooth thickness size Wa1 is engaged in the tooth bottom 22 between the internal tooth 21 of the internal tooth 21 of transverse tooth thickness size Wb3 and transverse tooth thickness size Wb1, the external tooth 11 of transverse tooth thickness size Wa2 is engaged in the tooth bottom 22 between the internal tooth 21 of the internal tooth 21 of transverse tooth thickness size Wb1 and transverse tooth thickness size Wb2, and then, the external tooth 11 of transverse tooth thickness size Wa3 is engaged in the tooth bottom 22 between the internal tooth 21 of the internal tooth 21 of transverse tooth thickness size Wb2 and transverse tooth thickness size Wb3, and internal rotor 1 repeats this engagement (with reference to Figure 10 to Figure 12) with external rotor 2.
By making such structure, by the external tooth 11,11 that has different transverse tooth thickness size Wa (Wa1, Wa2, Wa3) respectively among the denture Li outside the unit that is included in internal rotor 1 ... and the cycle of the size of the volume of the inboard cell Sa that constitutes of crescent moon body 3 can monotonously change and be non-monotonously change.Thus, can realize the discharge pulsation that irregular (at random) property is bigger.Equally, the internal tooth 21,21 that has different transverse tooth thickness size Wb (Wb1, Wb2, Wb3) respectively in by the unit that is included in external rotor 2 among the denture Lo ... and in the cycle of the size of the volume of the outside cell Sb that constitutes of crescent moon body 3, can monotonously change and be non-monotonously change yet.Thus, the discharge pulsation that irregular (at random) property is bigger can be realized, the peak value of discharging pulsation can be reduced.
Figure 10 to Figure 12 be illustrated in internal rotor 11 week of rotation during in, by the external tooth 11,11 of the different transverse tooth thickness size of having of denture Li unit outside (Wa1, Wa2, Wa3) ... inboard cell Sa, the Sa that constitutes successively with crescent moon body 3 ... the state of Volume Changes.In addition, expression by the internal tooth 21,21 of denture Lo in the unit of the external rotor 2 that rotate together with above-mentioned internal rotor 1 with different transverse tooth thickness size Wb (Wb1, Wb2, Wb3) ... the state of the Volume Changes of the outside cell Sb that constitutes successively with crescent moon body 3.
Then, based on Figure 13 to Figure 16 the 3rd mode of execution of the present invention is described.In the 3rd mode of execution, in by the crescent gear pump that constitutes with the same structure of the 2nd mode of execution of the present invention, make internal rotor 1 external tooth 11,11 ... pitch angle θ a separately different respectively.That is, in internal rotor 1, external tooth 11,11 ... transverse tooth thickness size Wa separately and pitch angle θ a inhomogeneous and different.Each internal tooth 21,21 of above-mentioned external rotor 2 ... transverse tooth thickness size Wb also corresponding to the transverse tooth thickness size Wa of the external tooth 11 of internal rotor 1, the pitch angle is inhomogeneous.
Here, the meaning of " correspondence " and the 1st and the 2nd mode of execution are same, be meant as crescent gear pump and the external tooth 11,11 of internal rotor 1 ... with the internal tooth 21,21 of external rotor 2 ... engagement well.The definition of the transverse tooth thickness size Wa of the external tooth 11 of above-mentioned internal rotor 1 is also same with the 2nd mode of execution.Thus, be formed on each adjacent external tooth 11,11 of above-mentioned internal rotor 1 and each inboard cell Sa, Sa between the above-mentioned crescent moon body 3 ... each volume also different, in its volume, there is difference in size, equally, be formed on each adjacent internal tooth 21,21 of above-mentioned external rotor 2 and each outside cell Sb, Sb between the above-mentioned crescent moon body 3 ... each volume also different.Thereby the amount of the liquid of being transferred by a plurality of inboard cell Sa and outside cell Sb changes according to above-mentioned inboard cell Sa and above-mentioned outside cell Sb.
In the 3rd mode of execution, also be that internal rotor 1 has denture Li outside the unit, external rotor 2 has the structure of denture Lo in the unit, outside the unit in denture Li and the unit outside the unit of denture Lo and above-mentioned the 2nd mode of execution in denture Li and the unit structure of denture Lo same.Be included in a plurality of external tooths among the denture Li 11,11 outside the above-mentioned unit ... separately transverse tooth thickness size Wa, Wa ... size and order preferably irregular (at random).
And then, same with the 2nd mode of execution, in internal rotor 1, outside a plurality of units the size of the transverse tooth thickness size Wa of denture Li and order all by identical style repeat form.In above-mentioned external rotor 2, be provided with above-mentioned unit outside denture Li equally by (common divisor) numerical value of N internal tooth that transverse tooth thickness size Wb is different 21,21 ... denture Lo in the unit of formation.Internal rotor 1 and external rotor 2 engagements, rotation correctly are meant that denture Lo meshes periodically in the unit of denture Li and external rotor 2 outside the unit of internal rotor 1.
Then, same with the situation of the 2nd mode of execution, as the concrete integer value of the tooth number Z b of the tooth number Z a of internal rotor 1 and external rotor 2, the tooth number Z a that establishes internal rotor 1 is 6, and the tooth number Z b that establishes external rotor 2 is 9 (with reference to Figure 13 (A), Figure 13 (B)).For 3 external tooths 11,11 among the outer denture Li of the unit of being included in ... transverse tooth thickness size Wa, different respectively in order to demonstrate size, be made as transverse tooth thickness size Wa1, transverse tooth thickness size Wa2, transverse tooth thickness size Wa3, the magnitude relationship of transverse tooth thickness size is Wa1＞Wa2＞Wa3 (with reference to Figure 13 (A)).
In addition, establish external tooth 11,11 among the outer denture Li of the unit of being included in ... pitch angle θ a different respectively.Particularly, if the pitch angle θ a1 of the external tooth 11,11 of transverse tooth thickness size Wa1 and transverse tooth thickness size Wa2, if the pitch angle θ a2 of the external tooth 11,11 of transverse tooth thickness size Wa2 and transverse tooth thickness size Wa3 establishes the pitch angle θ a3 of the external tooth 11,11 of transverse tooth thickness size Wa3 and transverse tooth thickness size Wa1.Here, for the external tooth 11,11 of transverse tooth thickness size Wa3 and transverse tooth thickness size Wa1, be meant the pitch angle of external tooth 11 and the external tooth 11 of transverse tooth thickness size Wa1 of the transverse tooth thickness size Wa3 of denture Li, Li outside the adjacent unit.
And then, also same about denture Lo in the unit of above-mentioned external rotor 2 with the structure of the 2nd mode of execution, by 3 internal tooths 21,21 that have different transverse tooth thickness size Wb respectively ... constitute, for be included in the internal tooth among the denture Lo 21,21 in this unit ..., also be the structure that has different transverse tooth thickness Wb1, Wb2, Wb3 respectively.Above-mentioned internal rotor 1 has denture Li, Li outside two units, external rotor 2 have denture Lo, Lo in 3 units ... (with reference to Figure 13 (A), Figure 13 (B)).In addition, corresponding to the external tooth 11,11 of internal rotor 1 ..., the internal tooth 21,21 of denture Lo in the unit of external rotor 2 ... pitch angle θ b separately also different, particularly, shown in Figure 13 (B), pitch angle θ b1, pitch angle θ b2, pitch angle θ b3 are different respectively.
By making such structure, by among the denture Li outside the unit that is included in internal rotor 1 having different respectively transverse tooth thickness size Wa (Wa1, Wa2, Wa3) and external tooth 11,11 ... the different respectively external tooth 11,11 of pitch angle θ a (θ a1, θ a2, θ a3) ... and the cycle of the size of the volume of the inboard cell Sa that constitutes of crescent moon body 3 be not non-monotonously change for monotonously change.Thus, can realize the discharge pulsation that irregular (at random) property is bigger.Equally, the internal tooth 21,21 that has different transverse tooth thickness size Wb (Wb1, Wb2, Wb3) respectively in by the unit that is included in external rotor 2 among the denture Lo ... and in the cycle of the size of the volume of the outside cell Sb that constitutes of crescent moon body 3, can monotonously change and be non-monotonously change yet.Thus, can realize the discharge pulsation that irregular (at random) property is bigger.
Figure 14 to Figure 16 be illustrated in the 3rd mode of execution internal rotor 11 week of rotation during in, by the external tooth 11,11 of the different transverse tooth thickness size Wa (Wa1, Wa2, Wa3) of having of denture Li unit outside ... inboard cell Sa, the Sa that constitutes successively with crescent moon body 3 ... the state of Volume Changes.In addition, expression by the internal tooth 21,21 of denture Lo in the unit of the external rotor 2 that rotate together with above-mentioned internal rotor 1 with different transverse tooth thickness size Wb (Wb1, Wb2, Wb3) ... outside cell Sb, the Sb that constitutes successively with crescent moon body 3 ... the state of Volume Changes.
Claims (13)
1, a kind of crescent gear pump, it is characterized in that, comprise the external rotor that is formed with internal tooth, be configured in interior all sides of this external rotor and be formed with the internal rotor of the external tooth of above-mentioned internal tooth engagement and be configured in crescent moon body in the gap of above-mentioned external rotor and internal rotor, each pitch interval of above-mentioned internal rotor forms unequal interval, and the pitch interval of the internal tooth of above-mentioned external rotor is corresponding with the pitch interval of the external tooth of above-mentioned internal rotor.
2, crescent gear pump as claimed in claim 1 is characterized in that, will for the row of the number of teeth of the common divisor of the number of teeth of the internal tooth of the number of teeth of the external tooth of internal rotor and external rotor as unequal interval pitch row, repeat to form same unequal interval pitch row.
3, crescent gear pump as claimed in claim 2 is characterized in that, the number of teeth of above-mentioned unequal interval pitch row is more than 3.
As each described crescent gear pump in the claim 1～3, it is characterized in that 4, the number of teeth of above-mentioned internal rotor is more than 6, the number of teeth of external rotor is more than 9.
As each described crescent gear pump in the claim 1～4, it is characterized in that 5, the size of each external tooth of unequal interval pitch row and the transverse tooth thickness of internal tooth is set at difference.
As each described crescent gear pump in the claim 1～5, it is characterized in that 6, the profile of tooth of above-mentioned internal rotor is a cycloidal tooth profile.
7, a kind of crescent gear pump, it is characterized in that, comprise the external rotor that is formed with internal tooth, be configured in interior all sides of this external rotor and be formed with the internal rotor of the external tooth of above-mentioned internal tooth engagement and be configured in crescent moon body in the gap of above-mentioned external rotor and internal rotor, the transverse tooth thickness size of each external tooth of above-mentioned internal rotor forms non-homogeneous, and the transverse tooth thickness of each internal tooth of above-mentioned external rotor is corresponding with the transverse tooth thickness size of above-mentioned internal rotor.
8, crescent gear pump as claimed in claim 7 is characterized in that, the number of teeth of the number of teeth of the external tooth of internal rotor and the internal tooth of external rotor is the multiple of the common divisor of two numbers of teeth; In the external tooth of above-mentioned internal rotor, possesses denture outside a plurality of units, denture is the number of teeth row of greatest common divisor at least and possesses different transverse tooth thickness respectively outside the described unit, possesses denture in the unit of the corresponding continuous formation of internal tooth of the outer denture of a plurality of units with above-mentioned internal rotor on above-mentioned external rotor.
9, crescent gear pump as claimed in claim 8 is characterized in that, the number of teeth of denture is more than 3 outside the unit of above-mentioned internal rotor.
As each described crescent gear pump in the claim 7～9, it is characterized in that 10, the number of teeth of above-mentioned internal rotor is more than 6, the number of teeth of external rotor is more than 9.
As each described crescent gear pump in the claim 7～10, it is characterized in that 11, the profile of tooth of above-mentioned internal rotor is a cycloidal tooth profile.
As each described crescent gear pump in the claim 7～11, it is characterized in that 12, the pitch angle of the external tooth of above-mentioned internal rotor is uneven, and the pitch angle of each internal tooth of above-mentioned external rotor is corresponding with the pitch angle of aforementioned external teeth.
13, as each described crescent gear pump in the claim 8～12, it is characterized in that, the pitch angle of the external tooth of denture is uneven outside the unit of above-mentioned internal rotor, and the pitch angle of the internal tooth of denture is corresponding with the pitch angle of denture outside the above-mentioned unit in the unit of above-mentioned external rotor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007178177 | 2007-07-06 | ||
| JP2007178177 | 2007-07-06 | ||
| JP2008148955 | 2008-06-06 |
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| Publication Number | Publication Date |
|---|---|
| CN101338746A true CN101338746A (en) | 2009-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101272949A Pending CN101338746A (en) | 2007-07-06 | 2008-07-03 | Internal gear pump |
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| Country | Link |
|---|---|
| JP (1) | JP2009036194A (en) |
| CN (1) | CN101338746A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102459959A (en) * | 2009-05-20 | 2012-05-16 | 米巴烧结奥地利有限公司 | Gear wheel |
| CN103452837A (en) * | 2012-06-01 | 2013-12-18 | 株式会社山田制作所 | Rotor for oil pump |
| CN105041382A (en) * | 2014-07-24 | 2015-11-11 | 摩尔动力(北京)技术股份有限公司 | Fluid mechanism |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102536793B (en) * | 2012-02-17 | 2015-01-14 | 河南大学 | Internally tangent barrel-shaped four-rotor displacement pump |
-
2008
- 2008-06-06 JP JP2008148955A patent/JP2009036194A/en active Pending
- 2008-07-03 CN CNA2008101272949A patent/CN101338746A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102459959A (en) * | 2009-05-20 | 2012-05-16 | 米巴烧结奥地利有限公司 | Gear wheel |
| CN102459959B (en) * | 2009-05-20 | 2015-03-11 | 米巴烧结奥地利有限公司 | Gear wheel |
| US9291248B2 (en) | 2009-05-20 | 2016-03-22 | Miba Sinter Austria Gmbh | Gear wheel |
| CN103452837A (en) * | 2012-06-01 | 2013-12-18 | 株式会社山田制作所 | Rotor for oil pump |
| CN103452837B (en) * | 2012-06-01 | 2016-06-29 | 株式会社山田制作所 | The rotor of oil pump |
| CN105041382A (en) * | 2014-07-24 | 2015-11-11 | 摩尔动力(北京)技术股份有限公司 | Fluid mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009036194A (en) | 2009-02-19 |
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Open date: 20090107 |