The basic theory of the research on the composite gear pump of the Coal Science Institute Xu Xianliang Bao Yun and Yun Fanming The friction coefficient of the compound gear pump of the friction index 2 depends on the kinematic fortunes of the meshing points. The influences of the motion law of the center wheel, the private item, and the item change are analyzed. Whether the Pak gear tooth is a multiple of 3 and the idle gear tooth number is 4 is even. With strict mathematical analysis and comparison of flow characteristics, it is concluded that the new type of liquid power element with a large amount of flow and uniformity of the flow is not a multiple of 3 in the number of center gears and that the compound balance gear pump can fully integrate internal and external gear pumps. Static radial hydraulic pressure balance BflMft advantages. Due to the role of the sealing block, the gears of the person 6 constitute the external gear and the gears constitute the internal gear pump. In theory, the number of idler gears 1 can be multiple. From the process point of view, it is better to use two or three. This article mainly introduces the basic theory of the idler type compound gear pump.
1 pressure balance geometric displacement, etc. asked the pressure balance due to the three internal and external gear pumps of the specific structure of the high and low mouth and transition zone, you can intuitively feel the static pressure radial hydraulic pressure balance. This is very beneficial to increase the life of the bearing. A detailed demonstration of the pressure balance can be found in Ref. 2. It is also stated that when the number of idlers is 45, the radial hydraulic pressure balance can also be demonstrated.
1.2 Geometric Displacement Flow and Variables The geometrical displacement of the compound balance gear pump is the change in the geometric volume of the active wheel revolution, which is equal to the sum of the geometrical displacements of the three internal and external gear pumps, taking into account the rotation of the center wheel. When turning over 21 teeth, the idler 8 must also turn 21 teeth, so the geometric displacement can be approximated, and the flow rate of the differential compound gear pump can be adjusted under the condition that the rotational speed of the internal gear is adjusted in the evening. However, the structure is complex and currently does not look at the base project. Narrow Science Fund helps! Head 5,575010; Fluid Transmission, Zhejiang University. Control 1 home point to speak Tuen Kai-cheng. ; help items to the project value, or as a quantitative pump, 1.3 minimum teeth in seven rounds taking into account the filter area at least 2 teeth to ensure the reliability of the seal, in addition to the central wheel idler meshing, sometimes there are 2 teeth in In the state of being fed, taking into account the suction and discharge port, the number of idlers for the idler type compound gearwheel is 215, or 5.
2 Basic theory and analysis method of flow characteristics 21 Basic formula of flow rate The flow rate of the compound gear pump is the sum of three internal and external gear mill flow rates. The flow rate of each internal and external gear pump is hoS.l.Sft;lM;a! =5Gl2L2rz2zfA2fM2a2=Bwii2 Office, magic is the center wheel and the idler tooth top height, the center wheel angle speed, 3=2, and, and 2 are the center and idler pitch circle radius respectively. Day 1=12. Heart=, 2, is the distance from point No. to point no. And 1 foot 1 is the base circle radius of the heart.褚 1= hole, spit angle, = 20; angular displacement wheel set for meshing point to node (1) and inner edge gear teeth, inner circle, inner circle, semi-loose heart yang, internal gear number, concentric Condition 51 +222; is the deviation of the engagement point of No. Wide, =.2 ft. factory idle wheel for a half circle. And the core (3) is the distance from the point of attachment to the node. The compound gear pump's flow rate 0 can be 22 agreed conditions. The formula 1 shows that the key to researching the pump flow characteristics of the mortar 4 is to pay the displacement of the meshing point. And, the analysis is ideal. , Gears 6 points 3 internal and external gear pumps each. The determination of the initial displacement of the engagement point of the key point and the determination of the key point, which is related to the gear wheel is the standard or modified idler number of the center wheel and the idler tooth number characteristics, and therefore has the following convention 1 round standard production and women's clothing. Wheel train; foot concentricity and installation conditions. That is 3r12z.
Idler gear serial number and as the corresponding internal and external gear chestnut serial number, such as No. 1 gear pump from the idler No. 1 and the center wheel No. 1 internal gear pump consists of Yue and internal gears.
Define the intersection of the pitch circle and the toothed line as the tooth line node, the center wheel force tooth line as the front tooth line, the tooth number as the clockwise direction mark, and note =, when the front tooth line node is located on the node home tooth No. 2 tooth. At the appointment node. In the vicinity, the teeth of the idler gear meshing with the center wheel are No. 1 teeth, and the serial number is marked by rotation. The initial displacement of the No. 1 tooth of the three idler gears is changed due to the difference in the number of teeth of the center gear, thereby affecting the flow characteristics.
(4) The displacement point of the meshing point to the nodal point on the tooth line is a wide radius. In the dead body, and in the house, the angular displacement from the mesh point to the node is 0 and the pole 1 is the same. The gear pump adopts, + design means, so that 2 enters the meshing drain, = 2 exits the meshing drain, where = 7,08 is the pitch, = 20 and is the center and idler wheel pitch.
23 The effect of the tooth number on the initial displacement Assumption =, when the front tooth line node of the center wheel 21 is located on the node body 1, if 21 is a multiple of 3 = 3 magic, it can be inferred that the magic and 2 magic number front tooth line node Located on the node and household 3 23. If 21 is not a multiple of 3, set 21 = 3 + without losing the generality, it can be inferred that its magic and 1+1 tooth in meshing state, its magic and 2 + 1 front tooth line The angular displacements from node to node 2 and 3 are 13 and a, 3l2h., WMt, KM., z, 3nfPz, 3nl, mMi.
When the influence of 始2 is assumed to be =0 at the initial position, the No. 2 tooth front toothed wire node of the center gear tooth No. 1 and the No. 1 rear tooth wire toothed wire node of the No. 1 idle gear are located at the top. When 22 is an odd number = 2+, 3 With a 1 inch front tooth line 4, the inner mesh is in a state of meshing. And when the front tooth line node position 1 is even number 22, its front tooth line is in meshing state with the internal gear, and the angular distance of the forward ray line node to the node corpse is 1; 21 D is deduced when 2 is odd and even At the time, the initial pitch point of the two idler No. 13 idler gears and the internal gears are opposite to each other, and the displacement of the sum is also the same. Therefore, the characteristics of tooth number must be studied in four cases.
From 2 and 00 we can see that when the user is at home, the center wheel 2 and 2 front tooth line nodes are respectively located at the node body, and the dead body 2, while the 1. Dead body 2, so the meshing displacement relative to each node can be (1) choose to know that the displacement of the front tooth line node relative to the node of each idler wheel is in meshing state in the period angle, and the center wheel number 2 and 2 are at 9 When = and 退出2 are released from meshing, and the number 2 21 teeth are engaged, the displacement of the meshing point can be small. When the shift point of = and +22=22+1 is known by the box 21, when it is =0. The 1st and 2nd left teeth of the heart gear mesh with the 1st tooth of the idler. The initial displacement of the meshing point is 0, 3, 3, and the left 2+1 tooth of the 23rd idler gear is engaged with the internal gear. Due to the symmetry of the point of traction, the initial displacement is also equal to that of the +1 number tooth and the 3rd idler. No. 1 tooth withdraws from engagement, and the meshing state occurs alternately. At 3 o'clock, the overall meshing state is superimposed on the same meshing line with ==, so when the meshing point at the meshing point +22=22 is displaced, = 3, The initial displacement of the engagement point of the spur gear, the heart of the internal gear pump No. 3, 3, and 13 is 2566. When =, 69 =, 16, the engagement state of the third gear is alternately changed, and the internal gear pump is The meshing state does not alternate, when; 3 =, 13, the body meshing state =, 1. The meshing point displacement can be also 1 3 The flow characteristic formula and the flow pulsation substituting the meshing point displacement under 4 conditions into the available flow rate The characteristic equation is tens of J for the above 4 equations, and the maximum value in the domain is determined to be 2! And the minimum value of 2 and the definition of the flow rate of the pulsation rate are set to 21, and 2 to 1 for each of the 4 conclusions of the modified gear. 231 + 1 is still better than 21 = good flow test uniformity. In 1721, the uniformity of the flow field became better, and the flow uniformity during production was changed. =, I1 Xu Xianliang Zhao Lianchun, Yan Zhenhui. The geometric flow characteristics of complex gear chestnuts. Journal of Huainan Institute of Technology, 199915862 I2I Fu Wenyu Xu Xian 1 walk.åž Balance type compound gear pump diameter hydraulic pressure analysis shoulder. Science and Technology hook technology. 9983718.
Xu Xianliang 1945, male Shandong Heze Ren, Professor, visiting scholar of the State Key Laboratory of Fluid Transmission and Control, Zhejiang University. He graduated from Beijing University of Mining and Technology in 1982 with a master's degree and is currently engaged in the teaching and research of hydraulic transmission and control of mining machinery. Published more than 30 papers such as flow pulse of plunger pump.
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