Novel eccentric rotor pump

Abstract

The invention discloses a novel eccentric rotor pump, belongs to the technical field of fluid pump design, and overturns two thinking habits in the field and following defects: the first thinking habit is that the flow of the pump can be increased only by increasing the volume, the structure and the specification of a pump body in the past, and the defects of the first thinking habit are obvious; the second thinking habit is that the effect of an eccentric structure is denied in the past, the suction amount and the extrusion amount of one side are increased after eccentricity is mistakenly considered, the extrusion amount and the suction amount of the other side are correspondingly increased, the overall effects are mutually counteracted, the flow cannot be increased, and therefore the effect of the eccentric structure is greatly improved. According to the invention, the two thinking habits and measures are overcome.

Description

Technical Field

[0001] The invention relates to a novel eccentric rotor pump, belonging to the technical field of fluid pump design. Background Art

[0002] At present, the commonly used hydraulic pumps include gear pumps, vane pumps, plunger pumps, and cycloid rotor pumps, each of which has its own advantages and disadvantages.

[0003] Gear pumps have problems such as "oil trapping", unbalanced radial hydraulic pressure, large flow pulsation, etc. "Oil trapping" causes a large additional load on gears and bearings, shortens bearing life, and reduces oil pump efficiency. In addition, "oil trapping" will increase the oil temperature, easily generate bubbles, and the bursting of bubbles will cause loud noise.

[0004] The vane pump has a complex structure and is difficult to manufacture. It is sensitive to the shaft speed and cannot work properly if it is too fast or too slow. It has high requirements for oil and can easily get the vanes stuck after being contaminated by oil, causing rapid wear. At high speed, the pressure difference at both ends of the vane can easily cause the vane to separate from the stator surface, causing the vane to be empty. Under high pressure, the vane and the stator surface will wear. Compared with the gear pump, it is noisy.

[0005] The plunger pump has a complex structure, many parts, is difficult to manufacture, and is expensive. It is mostly used as a high-pressure pump. Similar to the vane pump, this pump has high requirements for oil and is prone to getting the plunger stuck after being contaminated by oil. Due to the reciprocating motion of the plunger, it is not suitable for high speed.

[0006] Rotor pumps have a wide range of uses and can transport a variety of media, such as solid-liquid, liquid-gas, colloids and other media. Therefore, rotor pumps can be widely used in the petroleum, chemical, food, medicine, water transportation and other industries. They can transport high-viscosity media such as honey, cream, lubricating oil, and multiphase media such as coal slurry and crude oil.

[0007] The eccentric rotor pump (i.e. single screw pump) is a new type of pump that works on the principle of rotary meshing volumetric type. The main working parts are the eccentric (rotor) and the fixed bushing (stator). Due to the special geometric shape of these two parts, they form separate sealed chambers when they are eccentrically meshed. The liquid medium flows evenly in the axial direction, the internal flow velocity is low, the volume changes periodically, and the pressure is stable, so there will be no eddy current and agitation. The output pressure of each stage of the pump is 0.6MPa, the head is 60m (clean water), and the self-priming height is generally 6m. It is suitable for conveying medium temperatures below 80℃ (special requirements can reach 150℃). Because the stator is made of a variety of elastic materials, this pump adopts the principle of forced pushing for the delivery of high-viscosity fluids and media containing hard suspended particles or fibers. It has characteristics that general pumps cannot handle. Its flow rate is proportional to the speed. The transmission can be directly driven by a coupling, or by speed-adjusting motors, V-belts, gearboxes and other devices. This pump has few parts, compact structure, small size and easy maintenance. The rotor and stator are the wearing parts of this pump, which are processed by wire cutting. They have simple structure, are easy to assemble and disassemble, and have low processing cost.

[0008] Due to its structure and working characteristics, the eccentric rotor pump has the following advantages compared with piston pumps, centrifugal pumps, vane pumps, and gear pumps: it can transport media with high solid content; the flow rate is uniform and the pressure is stable, which is more obvious at low speed; the flow rate is proportional to the speed of the pump, so it has good variable adjustability; one pump can be used for multiple purposes and can transport media with different viscosities; the installation position can be tilted at will; it is suitable for transporting sensitive items and media that are easily damaged by centrifugal force; it has small size, light weight, low noise, simple structure, and convenient maintenance. Rotor pump technology is quite mature abroad, and product design and production have been serialized. The products have long been used in farmland irrigation, mud transportation, river channel sand discharge, crude oil mining, etc. Even though the cost is high, due to the advantages of life and maintenance, the operating cost is low. At present, the gap between domestic product performance and foreign products is large, and the corresponding theory is less. At present, the advantages of rotor pumps have attracted the recognition of domestic users and technicians. Schools and scientific research institutions have begun to develop and research rotor pumps in China, but they are still far behind the foreign level. We need to strengthen theoretical research and experience accumulation. Strengthen the promotion and application of eccentric rotor pumps.

[0009] The basic principle of the traditional rotor pump is as follows: the liquid medium enters the cavity of the cycloid internal gear mechanism from the entrance cavity. During the driving of the rotating shaft and the meshing operation of the cycloid internal gear mechanism, the inner rotor and the outer rotor form a cavity that changes continuously with the movement due to the eccentricity. When the meshing lines of the inner rotor and the outer rotor separate from each other, a negative pressure will be formed at the entrance cavity, and the liquid medium will be continuously sucked in. The sucked liquid medium is in a negative pressure state in the area at area A. When the meshing lines of the inner rotor and the outer rotor are embedded in each other, the liquid medium flowing to the enclosed space at area B is in an extrusion state. The pressure of the enclosed space will continue to increase, and the liquid medium will be squeezed out of the extrusion cavity at a high pressure and high speed. The liquid medium is input from one end and output from the other end to complete the suction and extrusion process.

[0010] like Figure 1 During the meshing operation of the inner and outer rotors, the size of the volume cavity inside the unit is changed, resulting in a periodic volume change effect. Due to the rotation of the inner and outer rotors, negative pressure is formed in the cavity, resulting in a pressure difference. This pressure difference pushes or sucks the hydraulic medium into the cavity.

[0011] Traditional rotor pumps use a three-layer structure. The outermost layer is the stator, which plays a fixed supporting role. The inner and outer rotors are installed inside the stator. The inner rotor drives the outer rotor to rotate. As a result, the volume of the space enclosed by the inner and outer rotors changes from small to large and from large to small in turn within a rotation cycle, which causes the medium to enter the enclosed space and squeeze out of the space, thus realizing the transportation of liquid media. This structure is complex, and the outer rotor and stator need to be fixed with bearings. It is troublesome to install and maintain. It cannot pump media with too high viscosity, and there are certain limitations in service life and scope of use.

[0012] Based on the above-mentioned shortcomings, therefore, a new eccentric rotor pump is needed to improve the above-mentioned shortcomings. Summary of the invention

[0013] The main purpose of the invention is to provide a novel eccentric rotor pump.

[0014] The purpose of the present invention can be achieved by adopting the following technical solutions: A novel eccentric rotor pump comprises a transmission shaft, a front cover, a rear cover, a rotor assembly and a filter plate; The rotor assembly consists of a stator, an inner rotor, a baffle plate, and a bearing; the rotor assembly is installed between the front cover and the rear cover; The transmission shaft passes through the rear end cover and is fixedly connected to the inner rotor; The filter plate is installed on the rear end cover; The baffle plates are symmetrically arranged on both sides of the inner rotor; The output end of the transmission shaft is sleeved with a bearing end cover, a felt ring is covered between the bearing end cover and the transmission shaft, a rolling bearing is rotatably connected between one side of the bearing end cover and the transmission shaft, an oil retaining ring is sleeved on one side of the rolling bearing, a shaft sleeve is sleeved on one side of the oil retaining ring, and the outer ring of the filter plate is covered with a rubber gasket.

[0015] Preferably, the inner rotor, the stator and the baffle plate of the rotor assembly together enclose a closed cavity; The baffle plate is opened at an appropriate position to form a flow channel for the liquid medium to enter the rotor assembly and be discharged; The rotor assembly has an entry cavity and an extrusion cavity; The inlet chamber and the extrusion chamber are formed by the inner rotor being eccentrically mounted relative to the stator; The extrusion chamber is located on the side where the inner rotor and stator mesh with each other; The inlet cavity is located on the side where the inner rotor and the stator are separated from each other.

[0016] Preferably, the front end cover has a liquid medium outlet, and the rear end cover has a liquid medium inlet.

[0017] Preferably, the filter plate is capable of filtering liquid impurities at the inlet.

[0018] Preferably, the inner rotor and the stator are clamped and sealed by two baffle plates; The inner rotor and the stator mesh with each other; The inner rotor and stator are both cycloid meshing; The inner rotor is driven by the transmission shaft; The stator of the rotor assembly is connected to the front cover and the rear cover respectively by screws.

[0019] Preferably, the rolling bearing is installed inside the rotor assembly; an integrated edge arc sealing sheet and a sealing ring are installed between the transmission shaft and the baffle plate.

[0020] Preferably, it is fixed to the stator with screws to control the flow direction of the liquid medium during the rotation of the transmission shaft.

[0021] Preferably, the inner rotor is meshed with the stator in a cycloid transmission, and the inner rotor rotates while revolving around the stator, thereby forming a new topological structure.

[0022] A novel eccentric rotor pump, the eccentric rotor pump also includes the following steps: Step 1: The rotor pump rotates on its own axis and revolves around the transmission shaft at a constant speed and in the opposite direction. Assume that the rotor revolves around its own axis in the stator cavity at an angular velocity of If the rotor rotates counterclockwise, the angular velocity of the rotor is Rotating clockwise, forming revolution, the angular velocity of rotation and revolution is equal in magnitude and opposite in direction, that is, At the center point O1 of any section of the rotor, a kinematic analysis is performed based on the relationship between the rotor's rotation and revolution; Set the speed of point O1 to Decomposed into rotational velocity and the orbital speed The relationship between the two linear velocities is , and then decompose the rotor rotation linear velocity along the X and Y axis directions: ; ； (1-1) According to the above method, the rotor revolution speed Decomposition along the X and Y directions: ; ; (1-2) Since the angular velocity of rotation and revolution is the same but in opposite directions, that is, , substituting into formula (1-1) and formula (1-2), we get: ; (1-3) ; (1-4) Due to the rotational speed and the orbital speed The relationship between the two linear velocities is As can be seen from the figure, the two directions are opposite. Combining the velocity components in the X direction and the Y direction, we can get: ; (1-5) ; (1-6) Further merging to obtain the velocity of point O1 at the center of the rotor section: ; (1-7) By integrating the velocity component of point O1 within the time range of 0-t, we can obtain the displacement function in the X and Y directions, which is expressed as follows: ; (1-8) ; (1-9) Further merging to obtain the displacement of the rotor section center point O1 is: ; (1-10) It can be seen from the above formula that the rotor of the rotor pump is reciprocating in the cross section of the stator cavity; The liquid medium enters the cavity of the cycloid internal gear mechanism from the inlet. During the driving of the transmission shaft and the meshing operation of the cycloid internal gear mechanism, the stator and the inner rotor form a number of cavities that change continuously with the movement due to the eccentric setting. The inner rotor is close to the inner wall of the stator and revolves around the stator while rotating. In a specific area, when the meshing lines of the stator and the inner rotor are separated from each other, the volume of the cavity enclosed by the stator, the inner rotor, and the baffle disc is the largest. The inlet is set by the structure of the baffle disc. At this time, the volume at the inlet is the largest, and negative pressure will be formed locally, thereby continuously sucking in the liquid medium. When the inner rotor revolves to the next position, when the meshing lines of the stator and the inner rotor are embedded with each other, the volume of the cavity enclosed by the stator, the inner rotor, and the baffle disc is the smallest, and the liquid medium in the cavity is squeezed to the next cavity. The extrusion port is set by the structure of the baffle disc on the other side of the inner rotor, forcing the liquid medium to be extruded from the extrusion cavity at a high pressure and high speed. A single unit completes the liquid medium suction and discharge, and the cycle is repeated to form a liquid medium suction and discharge process; Step 2: Centering of the Inner Rotor (12) With the center of the stator There is an eccentricity between , the stator is fixed, the inner rotor rotates and revolves around the center of the outer stator, the number of teeth on the stator is one more than the number of teeth on the inner rotor, correspondingly 5 to 9 teeth, and the number of teeth on the stator is 6; The inner rotor is driven by the shaft as the driving wheel, usually with 4 to 8 teeth. The number of teeth of the inner rotor used is 5. The main parameters of the inner rotor are: is the inner rotor tooth root circle radius; is the radius of the inner rotor tooth tip circle; is the inner rotor drive shaft aperture; is the number of teeth of the inner rotor and satisfies ;The parameters of the stator are: is the outer rotor tooth profile radius; is the radius of the created circle; is the outer rotor tooth root circle radius, also known as the limiting circle radius; is the radius of the inscribed circle of the outer rotor tooth tip; is the outer diameter of the outer stator; is the number of teeth of the outer rotor, and other parameters are: is the rolling radius for generating the cycloid tooth profile; is the radius of the base circle rolled by the rolling circle; i is the speed ratio; are the pitch circle radii of the inner and outer stators respectively, are the rotation speeds of the inner and outer rotors respectively.

[0023] Beneficial technical effects of the present invention: The present invention provides a new type of eccentric rotor pump, which subverts two thinking habits in the field and the defects that come with it. The first thinking habit is that in the past, the flow rate of the pump can only be increased by increasing the volume, structure and specifications of the pump body, and its defects are obvious. It is simple and compact to push the liquid medium through the periodic circulation volume pressure difference; The second thinking habit is that in the past, the effect of the eccentric structure was denied. It was mistakenly believed that after the eccentricity, one side increased the suction and discharge volume, and the other side correspondingly increased the discharge and suction volume. Then the overall effects offset each other and the flow rate would not increase. Therefore, the present invention overcomes these two thinking habits and measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the working principle of a cycloid internal gear mechanism of the prior art according to a preferred embodiment of a novel eccentric rotor pump of the present invention; Figure 2 A schematic diagram of the relative movement of the center point O1 of the rotor cross section according to a preferred embodiment of a novel eccentric rotor pump of the present invention; Figure 3 A schematic diagram of the suction and discharge of a rotor pump according to a preferred embodiment of a novel eccentric rotor pump of the present invention; Figure 4 A schematic diagram of the parameters of an outer stator of a preferred embodiment of a novel eccentric rotor pump according to the present invention; Figure 5 It is a parameter diagram of the inner rotor of a preferred embodiment of a novel eccentric rotor pump according to the present invention; Figure 6 A relationship diagram of a cycloid gear mechanism in normal meshing according to a preferred embodiment of a novel eccentric rotor pump of the present invention; Figure 7 A sectional view of a rotor pump according to a preferred embodiment of a novel eccentric rotor pump of the present invention.

[0025] In the figure: 1. front cover; 2. filter plate; 3. stator; 4. baffle plate; 5. rear cover; 6. bearing end cover; 7. transmission shaft; 8. felt ring; 9. rolling bearing; 10. oil retaining ring; 11. bushing; 12. inner rotor; 13. rubber gasket. DETAILED DESCRIPTION

[0026] In order to make the technical solution of the present invention more clear and specific to those skilled in the art, the present invention is further described in detail below in conjunction with embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0027] like Figure 1 - Figure 7As shown, a novel eccentric rotor pump provided in this embodiment includes a transmission shaft 7, a front cover 1, a rear cover 5, a rotor assembly, and a filter plate 2; The rotor assembly is composed of a stator 3, an inner rotor 12, a baffle plate 4, and a bearing 11; The rotor assembly is installed between the front cover 1 and the rear cover 5; The transmission shaft 7 passes through the rear end cover 5 and is fixedly connected to the inner rotor 12; the filter plate 2 is installed on the rear end cover 5; the baffle plates 4 are symmetrically arranged on both sides of the inner rotor 12; The output end of the transmission shaft 7 is sleeved with a bearing end cover 6, and a felt ring 8 is covered between the bearing end cover 6 and the transmission shaft 7. A rolling bearing 9 is rotatably connected between one side of the bearing end cover 6 and the transmission shaft 7. An oil retaining ring 10 is sleeved on one side of the rolling bearing 9, and a shaft sleeve 11 is sleeved on one side of the oil retaining ring 10. The outer ring of the filter plate 2 is covered with a rubber gasket 13.

[0028] The inner rotor 12, stator 3 and baffle plate 4 of the rotor assembly together enclose a closed cavity; the baffle plate 4 is opened at an appropriate position to form a flow channel for the liquid medium to enter and discharge the rotor assembly; The rotor assembly has an inlet cavity and an extrusion cavity; the inlet cavity and the extrusion cavity are formed by the inner rotor 12 being eccentrically mounted relative to the stator 3; The extrusion chamber is located at the side where the inner rotor 12 and the stator 3 mesh with each other; the entry chamber is located at the side where the inner rotor 12 and the stator 3 separate from each other.

[0029] The front end cover 1 is provided with a liquid medium outlet, and the rear end cover 5 is provided with a liquid medium inlet.

[0030] The filter plate 2 is capable of filtering liquid impurities at the inlet.

[0031] The inner rotor 12 and the stator 3 are clamped and sealed by two baffle plates 4; The inner rotor 12 and the stator 3 are meshed with each other; The inner rotor 12 and the stator 3 are both cycloid meshing; The inner rotor 12 is driven by the transmission shaft 7; the stator of the rotor assembly is connected to the front cover 1 and the rear cover 5 respectively by screws.

[0032] The rolling bearing 9 is installed inside the rotor assembly; an integrated edge arc sealing sheet and a sealing ring are installed between the transmission shaft 7 and the baffle plate 4.

[0033] It is fixed on the stator 3 with screws to control the flow direction of the liquid medium during the rotation of the transmission shaft 7.

[0034] The inner rotor 12 is cycloid-engaged with the stator 3 for transmission. The inner rotor 12 rotates while revolving around the stator 3, thereby forming a new topological structure.

[0035] like Figure 2 - Figure 7 As shown, the working process of a new eccentric rotor pump provided by this embodiment is as follows: the liquid medium enters the cavity of the cycloid internal gear mechanism from the inlet, and during the driving of the transmission shaft 7 and the meshing operation of the cycloid internal gear mechanism, the transmission shaft 7 rotates, driving the inner rotor 12 to revolve along the outer wall of the outer stator 3, and at the same time rotates, the inner rotor 12 and the outer stator 3 mesh with each other to form a plurality of independent closed tooth chambers, the volume of the closed tooth chamber changes with the rotation, and suction and discharge work is performed. During the working process, one part of the tooth chamber is for suction, and the other part of the tooth chamber is for discharge, and the suction and discharge of these two parts of the tooth chamber are always performed alternately, so that there is suction and discharge at every moment, ensuring the continuity of suction and discharge, and the suction and discharge volumes at each moment are basically the same, and the flow fluctuation is small. For each tooth chamber, it is both a suction chamber and a discharge chamber, and it is continuously switched according to a certain rule, so that the liquid medium can be squeezed and discharged smoothly.

[0036] Embodiment 1: Figure 2 - Figure 7 As shown, the front cover 1 has an inlet, and the liquid medium flows in through the front cover and passes through the filter plate 2. The filtered liquid medium enters the baffle plate through the filter plate 2. The baffle plate is a small-area opening component. A circular opening is opened at an appropriate position of the disc of the baffle plate. The liquid medium enters the inside of the rotor assembly from the circular opening. At this inlet, the teeth of the inner rotor 12 are separated from the slots of the stator 3, resulting in the maximum volume position enclosed by the stator 3 and the inner rotor 12. At this time, negative pressure is formed, and the liquid medium is sucked into the cavity. As the inner rotor 12 continues to revolve and rotate, the liquid medium entering the cavity is brought into the next meshing unit by the teeth of the inner rotor 12 to be pressurized and accelerated. Synchronously, the next wave of liquid medium from the circular inlet is brought into the cavity, thus achieving continuous flow. After the liquid medium is squeezed through several cavities, an opening is formed on the baffle plate 4 at an appropriate position on the other side of the rotor assembly to guide the liquid medium to be discharged from the opening and enter the cavity of the rear end cover 5. The rear end cover 5 has a discharge port, and the liquid medium is discharged from here. Because the liquid medium has been pressurized and accelerated for many cycles, it has a certain pressure and speed, and high pressure and high speed are achieved, achieving the purpose of pumping. The advantages of this structure are simple structure, convenient operation, and easy promotion. The rotor assembly of the novel eccentric rotor pump includes an inner rotor 12, a stator 3, and a baffle plate 4. Two baffle plates 4 sandwich the inner rotor 12 and the stator 3 to form a separate closed area for isolating the liquid medium, which is the core component of the entire rotor pump; The rotor assembly forms several topological structure areas in the rotor assembly through the rotation and revolution of the inner rotor 12 and the stator 3, and the enclosed area periodically changes from large to small and from small to large; The enclosed volume changes from small to large, which is called the negative pressure zone, and the enclosed volume changes from large to small, which is called the squeezed zone. The liquid medium enters the rotor assembly from the negative pressure zone and is discharged in the squeezed zone; The new eccentric rotor pump includes a rubber gasket 13, which is installed between the front cover 1, the rear cover 5 and the outer stator 3, isolating the liquid medium from overflowing through the gap between the front cover, the rear cover and the rotor assembly to a certain extent, and plays a role in sealing the interior. The new eccentric rotor pump includes a bearing 9, which is arranged in the cavity of the rear cover 5 and cooperates with the transmission shaft 7. The transmission shaft 7 passes through the rear cover 5 and the baffle plate 4, is supported by the bearing 9, and is connected to the inner rotor 12 by a key, thereby transmitting motion. The advantage of this structure is that it lubricates the bearings.

[0037] Embodiment 2: Figure 3 As shown, t is the rotation time, e is the eccentricity, and α is the rotation angle of the transmission shaft. The speed V of point O1 is decomposed into the rotation linear speed V1 and the revolution linear speed The linear velocity relationship between the two is v=v1+ , and then decompose the rotor rotation linear velocity along the X and Y axis directions: ; ;

[0038] According to the above method, the rotor revolution speed Decomposition along the X and Y directions: ; ;

[0039] Since the angular velocity of rotation and revolution is the same but in opposite directions, that is, ω2=-ω1=ω, substituting into formula (1-1) and formula (1-2), we get: ; (1-3) ; (1-4) Due to the rotational speed and the orbital speed The relationship between the two linear velocities is As can be seen from the figure, the two directions are opposite. Combining the velocity components in the X direction and the Y direction, we can get: ; ;

[0040] Further merging to obtain the velocity of point O1 at the center of the rotor section: (1-7) By integrating the velocity component of point O1 within the time range of 0-t, we can obtain the displacement function in the X and Y directions, which is expressed as follows: ; (1-8) ; (1-9) Further merging to obtain the displacement of the rotor section center point O1 is: ; (1-10) It can be seen from the above formula that the rotor of the rotor pump performs reciprocating motion in the cross-section of the stator inner cavity.

[0041] The working process of the present invention is as follows: the liquid medium enters the cavity of the cycloid internal gear mechanism from the inlet, and during the driving of the transmission shaft and the meshing operation of the cycloid internal gear mechanism, the stator and the rotor form a plurality of cavities that change continuously with the movement due to the eccentric arrangement, and the rotor is close to the inner wall of the stator, and revolves around the stator while rotating on its own; In a specific area, when the meshing lines of the stator 3 and the rotor are separated from each other, the volume of the cavity enclosed by the stator 3, the rotor, and the baffle plate 4 is the largest, and an inlet is set through the structure of the baffle plate 4. At this time, the volume at the inlet is the largest, and a negative pressure is formed locally, thereby continuously sucking in the liquid medium. When the rotor orbits to the next position, when the meshing lines of the stator 3 and the rotor are embedded in each other, the volume of the cavity enclosed by the stator 3, the rotor, and the baffle plate 4 is the smallest, and the liquid medium in the cavity is squeezed into the next cavity. An extrusion port is set through the structure of the baffle plate 4 on the other side of the rotor, forcing the liquid medium to be extruded from the extrusion cavity at a high pressure and high speed. A single unit completes the suction and discharge of the liquid medium, and the cycle is repeated to form a liquid medium suction and discharge process.

[0042] Embodiment 3; Generally speaking, the eccentric rotor pump (i.e., single-screw pump) can be used as a general-purpose relevant authority. The operating speed can be high or low. The rated pressure of the pump outlet can increase with the increase of the number of pump stages. For each additional stage, the pressure increases by 0.6MPa; it can transport media with high solid content; the flow rate is uniform and the pressure is stable, which is more obvious at low speed; the flow rate is proportional to the speed of the pump, and thus has good variable adjustability; one pump can be used for multiple purposes and can transport media of different viscosities; the installation position can be arbitrary to meet the needs of different locations; it is suitable for transporting sensitive items and items that are easily damaged by centrifugal force, etc.; it has small size, light weight, low noise, simple structure, and easy maintenance, so it has a wide range of uses. The rotor pump is widely used in shipbuilding industry, petroleum industry, chemical industry, medicine, daily chemical industry, etc.

[0043] Center of inner rotor Center of outer stator There is an eccentricity between , the outer stator is fixed, the inner rotor rotates and revolves around the center of the outer stator, the outer stator has one more tooth than the inner rotor, corresponding to 5 to 9 teeth, the outer stator in this project has 6 teeth; the inner rotor is driven by the shaft as the driving wheel, usually with 4 to 8 teeth, the inner rotor used in this project has 5 teeth, the main parameters of the inner rotor are: is the inner rotor tooth root circle radius; is the radius of the inner rotor tooth tip circle; is the inner rotor drive shaft aperture; is the number of teeth of the inner rotor and satisfies ; The parameters of the external stator are: is the outer rotor tooth profile radius; is the radius of the created circle; is the outer rotor tooth root circle radius, also known as the limiting circle radius; is the radius of the inscribed circle of the outer rotor tooth tip; is the outer diameter of the outer stator; is the number of teeth on the outer rotor. Other parameters are: is the rolling radius for generating the cycloid tooth profile; is the radius of the base circle rolled by the rolling circle; i is the speed ratio; are the pitch circle radii of the inner and outer stators respectively. are the rotation speeds of the inner and outer rotors respectively.

[0044] Depend on Figure 4 , Figure 5 and Figure 6 It can be seen that the parameters of the inner and outer rotors have the following relationship: ;

[0045] After adopting the eccentric operation of the stator 3 and the rotor, the present invention adds new features on the original basis while continuing to maintain the traditional structural characteristics. The overall advantages are as follows: the inner and outer rotors have a certain eccentricity. The larger the eccentricity, the greater the volume change of a single enclosed space, the greater the flow rate, and a larger flow demand can be obtained; Each working tooth chamber is both a suction chamber and an extrusion chamber. When one working tooth chamber is a suction chamber and the other working tooth chamber is an extrusion chamber, the suction and discharge of the medium are carried out simultaneously by the rotation of the inner rotor. Each process of each working tooth chamber from suction (or discharge) to discharge (or suction) is carried out continuously, and as long as one working tooth chamber is transferred from discharge (or suction) to suction (or discharge), at the same time, another working tooth chamber will be transferred from suction (or discharge) to discharge (or suction). The whole process is carried out continuously and alternately. At a certain moment, the process of liquid medium inflow and discharge is carried out synchronously, which offsets the liquid load pressure difference caused by unilateral inflow or discharge. Therefore, the flow fluctuation is small, the circumferential force on the transmission shaft is offset, and the life of the transmission shaft is extended.

[0046] Since the flow fluctuation is relatively small, it will be very beneficial to the hydraulic pressure impact of the liquid medium, so the noise is relatively small and it can run stably and smoothly.

[0047] Each working tooth cavity is both a suction cavity and a discharge cavity. When the liquid medium is continuously sucked in, it will be continuously squeezed out. There is no pressure in the transportation process, so the energy loss in the process is small, reducing efficiency loss.

[0048] The above description is only a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the scope disclosed by the present invention, which belong to the protection scope of the present invention.

Claims

1. A new type of eccentric rotor pump, characterized in that: It comprises a transmission shaft (7), a front end cover (1), a rear end cover (5), a rotor assembly, and a filter plate (2); The rotor assembly is composed of a stator (3), an inner rotor (12), a baffle plate (4), and a bearing (11); The rotor assembly is installed between the front cover (1) and the rear cover (5); The transmission shaft (7) passes through the rear end cover (5) and is fixedly connected to the inner rotor (12); the filter plate (2) is mounted on the rear end cover (5); The baffle plates (4) are symmetrically arranged on both sides of the inner rotor (12); The output end of the transmission shaft (7) is sleeved with a bearing end cover (6), a felt ring (8) is covered between the bearing end cover (6) and the transmission shaft (7), a rolling bearing (9) is rotatably connected between one side of the bearing end cover (6) and the transmission shaft (7), an oil deflector ring (10) is sleeved on one side of the rolling bearing (9), a shaft sleeve (11) is sleeved on one side of the oil deflector ring (10), and the outer ring of the filter plate (2) is covered with a rubber gasket (13).

2. A novel eccentric rotor pump according to claim 1, characterized in that: The inner rotor (12), the stator (3) and the baffle plate (4) of the rotor assembly together enclose a closed cavity; the baffle plate (4) is opened at an appropriate position to form a flow channel for the liquid medium to enter and be discharged from the rotor assembly; The rotor assembly has an entry cavity and an extrusion cavity; The inlet chamber and the extrusion chamber are formed by the inner rotor (12) being eccentrically mounted relative to the stator (3); The extrusion chamber is located on the side where the inner rotor (12) and the stator (3) are meshed with each other; and the entry chamber is located on the side where the inner rotor (12) and the stator (3) are separated from each other.

3. A novel eccentric rotor pump according to claim 2, characterized in that: The front end cover (1) is provided with a liquid medium outlet, and the rear end cover (5) is provided with a liquid medium inlet.

4. A novel eccentric rotor pump according to claim 3, characterized in that: The filter plate (2) is capable of filtering liquid impurities at the inlet.

5. A novel eccentric rotor pump according to claim 4, characterized in that: The inner rotor (12) and the stator (3) are clamped and sealed by two baffle plates (4); The inner rotor (12) and the stator (3) are meshed with each other; The inner rotor (12) and the stator (3) are both cycloid meshing; The inner rotor (12) is driven by a transmission shaft (7); the stator of the rotor assembly is connected to the front cover (1) and the rear cover (5) respectively by screws.

6. A novel eccentric rotor pump according to claim 5, characterized in that: The rolling bearing (9) is installed inside the rotor assembly; an integrated edge arc sealing sheet and a sealing ring are installed between the transmission shaft (7) and the baffle plate (4).

7. A novel eccentric rotor pump according to claim 6, characterized in that: It is fixed to the stator (3) by screws and controls the flow direction of the liquid medium during the rotation of the transmission shaft (7).

8. A novel eccentric rotor pump according to claim 7, characterized in that: The rotor assembly comprises an inner rotor (12) and a stator (3) in cycloid meshing transmission. The inner rotor (12) rotates while revolving around the stator (3), thereby forming a new topological structure.

9. A novel eccentric rotor pump according to claim 8, characterized in that: The eccentric rotor pump also includes the following steps: Step 1: The rotor pump rotates while making a constant speed and opposite revolution around the transmission shaft. Assuming that the rotor rotates counterclockwise around its own axis at an angular velocity of ω1 in the inner cavity of the stator, the rotor rotates clockwise around the stator axis at an angular velocity of ω2, forming an orbit. The angular velocities of rotation and revolution are equal in magnitude and opposite in direction, that is, ω2 = -ω1. At the center point O1 of any cross section of the rotor, perform a kinematic analysis based on the relationship between the rotor's rotation and revolution; The velocity v of point O1 is decomposed into the rotation linear velocity v1 and the revolution linear velocity v2. The linear velocity relationship between the two is v=v1+v2. Then the rotor rotation linear velocity is decomposed along the X and Y axis directions: v 1x =v1cos(α-w1t) v 1y =v1cos(α-w1t) (1-1) According to the above method, the rotor revolution linear velocity v2 is decomposed along the X and Y directions: v 2x =v2cos(α-w2t) v 2y =v2sin(α-w2t) (1-2) Since the angular velocity of rotation and revolution is the same but in opposite directions, that is, ω2=-ω1=ω, substituting into formula (1-1) and formula (1-2), we get: Since the linear velocity of rotation V1 and the linear velocity of revolution v2 are related by v=v1+v2, as can be seen from the figure, the two are in opposite directions. The velocity components in the X direction and the Y direction are combined and sorted out to obtain: v x =v 2x -v 1x =eωcos(α+ωt)-eωcos(α-ωt) =-2eω·sinα·sinωt (1-5) v x =v 2x --v 1x =eωcos(α+ωt)-eωcos(α-ωt) =-2eω·sina·sinωt (1-6) Further merging to obtain the velocity of point O1 at the center of the rotor section: By integrating the velocity component of point O1 within the time range of 0-t, we can obtain the displacement function in the X and Y directions, which is expressed as follows: Further merging to obtain the displacement of the rotor section center point O1 is: It can be seen from the above formula that the rotor of the rotor pump is reciprocating in the cross section of the stator cavity; The liquid medium enters the cavity of the cycloid internal gear mechanism from the inlet. During the driving of the transmission shaft and the meshing operation of the cycloid internal gear mechanism, the stator (3) and the inner rotor (12) form a plurality of cavities that change continuously with the movement due to the eccentric arrangement. The inner rotor (12) is closely attached to the inner wall of the stator (3) and revolves around the stator (3) while rotating. In a specific area, when the meshing lines of the stator (3) and the inner rotor (12) are separated from each other, the volume of the cavity enclosed by the stator (3), the inner rotor (12) and the baffle plate (4) is the largest. The inlet is arranged through the structure of the baffle plate (4). At this time, the inlet The volume at the entrance is the largest, and negative pressure is formed locally, thereby continuously sucking in the liquid medium. When the inner rotor (12) orbits to the next position, the meshing lines of the stator (3) and the inner rotor (12) are embedded in each other, and the volume of the cavity enclosed by the stator (3), the inner rotor (12) and the baffle plate (4) is the smallest. The liquid medium in the cavity is squeezed into the next cavity, and an extrusion port is set through the structure of the baffle plate (4) on the other side of the inner rotor (12), forcing the liquid medium to be squeezed out of the extrusion cavity at a high pressure and high speed. A single unit completes the suction and discharge of the liquid medium, and the cycle is repeated to form a liquid medium suction and discharge process; Step 2: There is an eccentric distance e between the center δ1 of the inner rotor (12) and the center O2 of the stator (3), the stator (3) is fixed, the inner rotor (12) rotates and revolves around the center of the outer stator, the number of teeth of the stator (3) is one more than the number of teeth of the inner rotor (12), correspondingly 5 to 9 teeth, and the number of teeth of the stator (3) is 6; The inner rotor (12) is driven by the rotating shaft as the driving wheel, usually with 4 to 8 teeth, and the number of teeth of the inner rotor used is 5. The main parameters of the inner rotor (12) are: P2 is the root circle radius of the inner rotor (12); P1 is the tip circle radius of the inner rotor (12); d0 is the aperture of the transmission shaft of the inner rotor (12); z1 is the number of teeth of the inner rotor (12), and z2=z1+1 is satisfied; the parameters of the stator (3) are: a is the radius of the outer rotor tooth profile circle; R is the radius of the creation circle; L is the outer rotor tooth root circle radius, also known as the limit circle radius; r is the radius of the inscribed circle of the outer rotor tooth tip; D is the outer diameter of the outer stator; z2 is the number of teeth of the outer rotor. Other parameters are: r g r is the rolling radius of the cycloid tooth profile; j is the radius of the base circle rolled by the rolling circle; i is the speed ratio; r1 and r2 are the pitch circle radii of the inner and outer stators respectively. n1 and n2 are the rotation speeds of the inner and outer rotors respectively.

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