阅读说明：本技术 一种内转子摆动刮板泵 (Inner rotor swing scraper pump ) 是由 赵清海 张洪信 张铁柱 杨道哉 姜勇 于 2020-09-08 设计创作，主要内容包括：本发明属于流体动力机械技术领域,涉及一种内转子摆动刮板泵,利用摆动刮板代替传统叶片泵的往复移动叶片,通过压力自密封实现高压输出；通过内转子型线参数提高容积利用率,形成一种无阀式配流系统、压力高、结构紧凑、可高速高效工作的流体泵,其结构紧凑,工作稳定,技术继承性好,工艺简单,成本低；具有自密封性,输出压力可高达70MPa以上；将机械能高效地转化为流体压力能,一般情况下总效率可达90％以上,具有较好的推广应用价值。(The invention belongs to the technical field of fluid power machinery, and relates to an inner rotor swing scraper pump, which utilizes a swing scraper to replace a reciprocating blade of a traditional blade pump and realizes high-pressure output through pressure self-sealing; the volume utilization rate is improved through the inner rotor profile parameters, and the fluid pump which is a valveless flow distribution system, has high pressure and compact structure, can work at high speed and high efficiency is formed; the self-sealing performance is realized, and the output pressure can reach more than 70 MPa; the mechanical energy is efficiently converted into fluid pressure energy, the total efficiency can reach more than 90 percent under general conditions, and the method has better popularization and application values.)

1. An inner rotor swinging scraper pump is characterized in that a main body structure comprises a pin shaft, a swinging scraper, a cam rotor, a pump body, a transmission key, a transmission shaft, a compression spring, a fluid outlet pipeline, a fluid inlet pipeline, a rear end cover sealing ring, a rear end cover, a rear bearing, a rear end cover bolt, an adjusting gasket, a cover plate sealing ring, a front end cover, a shaft sealing ring, a front bearing, a front end cover bolt and a cover plate bolt; the transmission shaft is of a stepped shaft structure, the front end of the transmission shaft is a power input end, the middle section of the transmission shaft is connected with the cam rotor through a transmission key and synchronously rotates, the front section and the rear section of the transmission shaft are respectively supported in the inner rings of a front bearing and a rear bearing, the front bearing and the rear bearing are respectively assembled in bearing seat holes of the pump body and the cover plate, the outer ring of the front bearing is in contact positioning with the flange of the front end cover, and the inner ring is positioned by the shaft shoulder of the; the outer ring of the rear bearing is positioned in contact with the flange of the rear end cover, and the inner ring is positioned by the shaft shoulder of the transmission shaft; two end faces of the cam rotor respectively face the inner cavity wall of the pump body and the inner surface of the cover plate, and are in close clearance fit with each other to reduce internal leakage; the large end of the swinging scraper is provided with a hole which is in clearance fit with the pin shaft, the periphery of the swinging scraper is locally cylindrical and is in small clearance fit with the inner cavity wall of the pump body, and the leakage between the swinging scraper and the inner wall surface of the pump body is reduced when the swinging scraper swings around the pin shaft; the other end of the swinging scraper is a pointed top, and the inclination direction is opposite to the rotation direction of the cam rotor; the pressing spring is arranged between the swinging scraper and the wall surface of the fluid outlet pipeline, and presses the swinging scraper against the outer wall surface of the cam rotor, so that the sharp top or the back of the swinging scraper can be reliably attached to the surface of the cam rotor when the cam rotor rotates, and the sealing effect is ensured; the pump body is a hollow shell structure, the rear part of the pump body is provided with a bearing seat hole for placing a rear bearing, the front part of the pump body is provided with a large hole to form a main body part of a pump cavity, and a small hole for mounting a pin shaft is arranged on the cavity wall between the fluid outlet pipeline and the fluid inlet pipeline on the pump body; the rear end cover is connected to the pump body through a rear end cover bolt, a flange is arranged on the rear end cover and is embedded in a bearing seat hole of the pump body and props against the outer ring of the rear bearing, and a sealing ring groove is formed in the periphery of the flange of the rear end cover and is used for mounting a rear end cover sealing ring, so that fluid is prevented from leaking from the joint between the rear end cover and the pump body; the cover plate is connected with the pump body through a cover plate bolt, and an adjusting gasket is arranged between the cover plate and the pump body and used for adjusting the clearance between the cam rotor and the inner wall of the pump body and between the cover plate, so that the flexible rotation of the cam rotor is ensured, and the internal leakage of fluid is reduced; the boss on the cover plate is embedded in the cavity of the pump body, and a sealing ring groove is formed in the periphery of the boss and used for installing a cover plate sealing ring, so that fluid is prevented from leaking from the joint between the cover plate and the pump body; the center part of the cover plate is provided with a bearing through hole for installing a front bearing, and a flange of the front end cover is also arranged in the bearing through hole and is contacted with an outer ring of the front bearing; the front end cover is connected to the cover plate through a front end cover bolt, a sealing ring groove for mounting a front end cover sealing ring is formed in the periphery of a flange of the front end cover, the front end cover sealing ring prevents fluid from leaking from a joint between the front end cover and the cover plate, a through hole is formed in the center of the front end cover, the transmission shaft penetrates out of the through hole, the sealing ring groove for mounting the shaft sealing ring is formed in the inner periphery of the through hole, and the shaft sealing ring prevents fluid from leaking from the joint between the front end cover and the transmission shaft.

2. The inner rotor oscillating vane pump of claim 1, wherein the outer peripheral shape of the cam rotor is a cam profile, the cam profile comprises a combination of various smooth elliptical, semi-elliptical or profile lines, the shape and size of the pump cavity are determined by the distance from each point on the cam profile to the cylindrical inner cavity peripheral wall of the pump body, and the displacement of the inner rotor oscillating vane pump is determined by the shape and size of the pump cavity and the outer diameter of the cylindrical inner cavity peripheral wall of the pump body; the periphery of the cam rotor is in good contact with the top or the back of the swing scraper, when the cam rotor rotates, the swing scraper rotates around the pin shaft, the top or the back of the swing scraper is always attached to the peripheral surface of the cam rotor, and the swing scraper has a scraping effect on fluid on the surface of the cam rotor.

3. The inner rotor oscillating vane pump of claim 1, wherein the oscillating vane has a length greater than the difference between the radius of the inner cavity of the pump body and the minimum radius of the peripheral surface of the cam rotor, wherein the radius of the peripheral surface of the cam rotor is the distance between a point on the profile of the peripheral surface of the rotor and the center of rotation, and when the cam rotor rotates, the oscillating vane and the cam rotor can slide relatively all the time and cannot be self-locked.

4. The inner rotor oscillating flighted pump according to claim 1, characterized in that the compression spring is a coil spring or a torsion spring.

5. The inner rotor swing vane pump of claim 1, wherein the pump body is connected to an external base, the fluid outlet pipe and the fluid inlet pipe are respectively connected to external high-pressure and low-pressure fluid pipes, and the swing vane forms a high-pressure chamber of the pump chamber in a cavity surrounded by one side of the compression spring, the inner chamber wall of the pump body, the outer peripheral surface of the cam rotor, and the inner surface of the cover plate; a low-pressure cavity of the pump cavity is formed by a cavity surrounded by the other side of the swinging scraper, the inner cavity wall of the pump body, the peripheral surface of the cam rotor and the inner surface of the cover plate; the other cavity is a trapped fluid cavity of the pump cavity.

6. The inner rotor swing scraper pump according to claim 1, characterized in that the inner rotor swing scraper pump converts the input mechanical energy into fluid pressure energy during operation, the external power drives the transmission shaft, the cam rotor is driven to rotate synchronously by the transmission key, the swing scraper swings around the pin shaft, under the action of the compression spring and the high pressure fluid, the back of the sharp top or the low pressure side of the swing scraper is pressed against the cam rotor all the time, the higher the fluid pressure is, the higher the pressure between the swing scraper and the wheel rotor is, the better the sealing effect is; along with the rotation of the cam rotor, when the high-pressure cavity is larger, the sharp top scrapes the surface fluid of the cam rotor, the high-pressure cavity is reduced, and the back surface of the gradually swinging scraper begins to contact with the surface of the cam rotor and generates relative friction; the volume of the high-pressure cavity is reduced along with the rotation of the cam rotor, and high-pressure fluid is output from the fluid outlet pipeline; the volume of the low-pressure cavity is increased, the low-pressure fluid enters the low-pressure cavity from the fluid inlet pipeline, the cam rotor continuously rotates, the low-pressure fluid continuously enters the pump cavity, the high-pressure fluid is continuously output, and the conversion from mechanical energy to fluid pressure energy is completed.

The technical field is as follows:

the invention belongs to the technical field of fluid power machinery, and relates to a novel fluid power device, in particular to an inner rotor swing scraper pump.

Background art:

the existing vane pump or rotor pump has a plurality of patents, and has relatively compact structure and acceptable efficiency under medium speed and pressure because of no need of a distributing valve, so the vane pump or rotor pump has wide application. However, in the conventional single-acting or double-acting vane pump, because the vane is required to reciprocate in the mounting groove of the pump, the vane body in the groove is required to have enough length for guiding all the time, the structure is loose, the friction force between the vane and the groove wall is increased along with the rise of pressure, the reciprocating movement of the vane is delayed, and the internal leakage is increased, for example, the conventional roots pump, the sealless rotor industrial pump disclosed by ZL 200420052193.7 comprises a sealless sliding vane pump, a sealless flexible impeller pump, a sealless rotary piston pump, a sealless roots pump and the like, no sealing device is arranged at a gap formed between a driven shaft and a driving shaft of the end surface of a rotor cavity of the pump and a pump body, fluid leaking from the gap enters a bleeding cavity and then flows back to a low-pressure cavity or a fluid inlet pipeline, the inner side of the bleeding cavity is adjacent to the rotor cavity, and the outer side of the bleeding cavity; the outer side of the effusion cavity adopts a conventional sealing element; the driven shaft and the driving shaft of the rotor cavity are made into an extending beam or a simply supported beam structure; the return port is directly communicated with the low-pressure cavity through the inside of the pump body or is communicated with the fluid inlet pipeline through an external pipeline of the pump body. The double-cam rotor vane pump disclosed in ZL97210597.2 is characterized in that a pump cover and a transmission shaft in a pump body are sequentially provided with a pressure side plate, two cam rotors which form an angle of 90 degrees with each other and rotate along with the shaft in an inner hole of a stator, a partition plate and an oil distribution disc, and two groups of vanes are respectively arranged in a straight groove of the stator. ZL00245048.8 discloses a cam rotor vane pump, which comprises a pump case and a cam rotor sleeved in the pump case, wherein the two ends of the pump case are respectively provided with a left end cover and a right end cover, the rotating shaft of the cam rotor is supported by the left end cover and the right end cover, the pump case is provided with a fluid inlet and a fluid outlet which are communicated with the inner cavity of the pump case, the inner wall of the pump case is provided with a vane sliding groove, a vane is arranged in the vane sliding groove, the front end of the vane extends out of the vane sliding groove and is contacted with the surface of the cam rotor, a spring which applies elastic force pointing to the front end of the vane to the vane is arranged in the vane sliding groove. The scraper pump for the constant-current dust sampler disclosed by ZL201610893753.4 comprises a pump body, wherein a pump body cylinder sleeve is arranged in a pump body cavity, a cavity of the pump body cylinder sleeve is formed into a pump cavity, a left pump body cover is fixed at the left end of the pump body, a right pump body cover is fixed at the right end of the pump body, a pump body air inlet joint is arranged at the upper part of the pump body, a pump body air outlet joint is arranged at the lower part of the pump body, and the pump body air inlet joint and the pump body air outlet joint are; the motor is fixed on the motor base, the motor base is fixed with the left pump body cover, and a motor shaft of the motor extends into the pump cavity; and a rotor which is arranged in the pump chamber and fixed with the motor shaft, wherein a group of scraper chutes are arranged on the rotor and along the length direction of the rotor at equal intervals around the circumference direction of the rotor, and scrapers are respectively inserted in a sliding manner at positions corresponding to the group of scraper chutes. The upper end surface and the lower end surface of a single-blade impeller disclosed by ZL201920947626.1 are end convex arc surfaces attached to an inner cavity arc surface of a pump body of a rotor pump, transition convex arc surfaces are respectively formed on the end convex arc surfaces and two sides of the double-blade impeller, a pair of convex arc surfaces are arranged on the end convex arc surfaces in a face-to-face mode, concave arc surfaces attached to and matched with the transition convex arc surfaces are formed between the pair of convex arc surfaces and the transition convex arc surfaces, and smooth transition is achieved between the intersected convex arc surfaces and the concave arc surfaces. The upper end surface and the lower end surface of the double-blade impeller disclosed by ZL201920946772.2 are end convex arc surfaces attached to an inner cavity arc surface of a pump body of a rotor pump, transition convex arc surfaces are respectively formed on the end convex arc surfaces and two sides of the double-blade impeller, a section of middle convex arc surface is arranged in the middle of the left side and the right side of the double-blade impeller, concave arc surfaces attached to and matched with the transition convex arc surfaces are formed between the middle convex arc surfaces and the transition convex arc surfaces, and the convex arc surfaces and the concave arc surfaces which are intersected are in smooth transition. Although the volume utilization rate of the vane pump or the rotor pump is high, the vane pump or the rotor pump does not have reliable self-sealing performance, is difficult to build higher pressure, and has a complex structure and high processing and assembling difficulty. Therefore, an inner rotor swing scraper pump needs to be designed, a swing scraper is used for replacing a reciprocating blade, pressure self-sealing is achieved, and a novel fluid pump which is free of a distributing valve, high in pressure, compact in structure, high in speed and efficient is formed. At present, no public report or use of similar power devices is found.

The invention content is as follows:

the invention aims to overcome the defects in the prior art, and provides an inner rotor swing scraper pump, which utilizes a swing scraper to replace a reciprocating blade of a traditional vane pump and realizes high-pressure output through pressure self-sealing; the volume utilization rate is improved through the inner rotor profile parameters, and the fluid pump which is a valveless flow distribution system, high in pressure, compact in structure and capable of working at high speed and high efficiency is formed.

In order to achieve the purpose, the main body structure of the inner rotor swing scraper pump comprises a pin shaft, a swing scraper, a cam rotor, a pump body, a transmission key, a transmission shaft, a compression spring, a fluid outlet pipeline, a fluid inlet pipeline, a rear end cover sealing ring, a rear end cover, a rear bearing, a rear end cover bolt, an adjusting gasket, a cover plate sealing ring, a front end cover, a shaft sealing ring, a front bearing, a front end cover bolt and a cover plate bolt; the transmission shaft is of a stepped shaft structure, the front end of the transmission shaft is a power input end, the middle section of the transmission shaft is connected with the cam rotor through a transmission key and synchronously rotates, the front section and the rear section of the transmission shaft are respectively supported in the inner rings of a front bearing and a rear bearing, the front bearing and the rear bearing are respectively assembled in bearing seat holes of the pump body and the cover plate, the outer ring of the front bearing is in contact positioning with the flange of the front end cover, and the inner ring is positioned by the shaft shoulder of the; the outer ring of the rear bearing is positioned in contact with the flange of the rear end cover, and the inner ring is positioned by the shaft shoulder of the transmission shaft; two end faces of the cam rotor respectively face the inner cavity wall of the pump body and the inner surface of the cover plate, and are in close clearance fit with each other to reduce internal leakage; the large end of the swinging scraper is provided with a hole which is in clearance fit with the pin shaft, the periphery of the swinging scraper is locally cylindrical and is in small clearance fit with the inner cavity wall of the pump body, and the leakage between the swinging scraper and the inner wall surface of the pump body is reduced as much as possible when the swinging scraper swings around the pin shaft; the other end of the swinging scraper is a pointed top, and the inclination direction is opposite to the rotation direction of the cam rotor; the pressing spring is arranged between the swinging scraper and the wall surface of the fluid outlet pipeline, and presses the swinging scraper against the outer wall surface of the cam rotor, so that the sharp top or the back of the swinging scraper can be reliably attached to the surface of the cam rotor when the cam rotor rotates, and the sealing effect is ensured; the pump body is a hollow shell structure, the rear part of the pump body is provided with a bearing seat hole for placing a rear bearing, the front part of the pump body is provided with a large hole to form a main body part of a pump cavity, and a small hole for mounting a pin shaft is arranged on the cavity wall between the fluid outlet pipeline and the fluid inlet pipeline on the pump body; the rear end cover is connected to the pump body through a rear end cover bolt, a flange is arranged on the rear end cover and is embedded in a bearing seat hole of the pump body and props against the outer ring of the rear bearing, and a sealing ring groove is formed in the periphery of the flange of the rear end cover and is used for mounting a rear end cover sealing ring, so that fluid is prevented from leaking from the joint between the rear end cover and the pump body; the cover plate is connected with the pump body through a cover plate bolt, and an adjusting gasket is arranged between the cover plate and the pump body and used for adjusting the clearance between the cam rotor and the inner wall of the pump body and between the cover plate, so that the flexible rotation of the cam rotor is ensured, and the internal leakage of fluid is reduced as much as possible; the boss on the cover plate is embedded in the cavity of the pump body, and a sealing ring groove is formed in the periphery of the boss and used for installing a cover plate sealing ring, so that fluid is prevented from leaking from the joint between the cover plate and the pump body; the center part of the cover plate is provided with a bearing through hole for installing a front bearing, and a flange of the front end cover is also arranged in the bearing through hole and is contacted with an outer ring of the front bearing; the front end cover is connected to the cover plate through a front end cover bolt, a sealing ring groove for mounting a front end cover sealing ring is formed in the periphery of a flange of the front end cover, the front end cover sealing ring prevents fluid from leaking from a joint between the front end cover and the cover plate, a through hole is formed in the center of the front end cover, the transmission shaft penetrates out of the through hole, the sealing ring groove for mounting the shaft sealing ring is formed in the inner periphery of the through hole, and the shaft sealing ring prevents fluid from leaking from the joint between the front end cover and the transmission shaft.

The periphery of the cam rotor is in the shape of a cam profile which can be a smooth ellipse, a semi-ellipse and other profiles or combinations of profiles, the shape and the size of a pump cavity are determined by the distance between each point on the cam profile and the peripheral wall of a cylindrical inner cavity of a pump body, and the discharge capacity of the inner rotor swinging scraper pump is determined by the shape and the size of the pump cavity and the outer diameter of the peripheral wall of the cylindrical inner cavity of the pump body; the periphery of the cam rotor is in good contact with the top or the back of the swing scraper, when the cam rotor rotates, the swing scraper can rotate around the pin shaft, but the top or the back of the swing scraper is always attached to the peripheral surface of the cam rotor, and the swing scraper has a scraping effect on fluid on the surface of the cam rotor.

The length of the swing scraper is greater than the difference between the radius of the inner cavity of the pump body and the minimum radius of the peripheral surface of the cam rotor, wherein the radius of the peripheral surface of the cam rotor refers to the distance between a point on a molded line of the peripheral surface of the rotor and a rotating center, and when the cam rotor rotates, the swing scraper and the cam rotor can always slide relatively and cannot be self-locked.

The compression spring can be in various forms such as a spiral spring, a torsion spring and the like.

The pump body can be connected with an external base body in various ways, the fluid outlet pipeline and the fluid inlet pipeline are respectively connected to external high-pressure and low-pressure fluid pipelines, and the swinging scraper forms a high-pressure cavity of a pump cavity in a cavity surrounded by one side of the compression spring, the wall of the inner cavity of the pump body, the peripheral surface of the cam rotor and the inner surface of the cover plate; a low-pressure cavity of the pump cavity is formed by a cavity surrounded by the other side of the swinging scraper, the inner cavity wall of the pump body, the peripheral surface of the cam rotor and the inner surface of the cover plate; the other cavity is a trapped fluid cavity of the pump cavity.

When the hydraulic sealing device works, input mechanical energy is converted into fluid pressure energy, an external power drives the transmission shaft, the cam rotor is driven to synchronously rotate through the transmission key, the swinging scraper blade swings around the pin shaft, the back surface of the sharp top or the low-pressure side of the swinging scraper blade is always pressed on the cam rotor under the action of the compression spring and high-pressure fluid, the higher the fluid pressure is, the higher the pressure between the swinging scraper blade and the wheel rotor is, and the better the sealing effect is; along with the rotation of the cam rotor, when the high-pressure cavity is larger, the sharp top scrapes the surface fluid of the cam rotor, the high-pressure cavity is reduced, the back surface of the gradually swinging scraper begins to contact with the surface of the cam rotor and generates relative friction, and a better fluid sealing effect is also achieved; the volume of the high-pressure cavity is reduced along with the rotation of the cam rotor, and high-pressure fluid is output from the fluid outlet pipeline; the volume of the low-pressure cavity is increased, and the low-pressure fluid enters the low-pressure cavity from the fluid inlet pipeline. The cam rotor continuously rotates, low-pressure fluid continuously enters the pump cavity, and high-pressure fluid continuously is output, so that conversion from mechanical energy to fluid pressure energy is completed.

Compared with the prior art, the invention has the advantages of compact structure, stable work, good technical inheritance, simple process and low cost; the self-sealing performance is realized, and the output pressure can reach more than 70 MPa; the mechanical energy is efficiently converted into fluid pressure energy, the total efficiency can reach more than 90 percent under general conditions, and the method has better popularization and application values.

Description of the drawings:

fig. 1 is a front view of the inner rotor oscillating vane pump of the present invention, cut away.

Fig. 2 is a cut-away left side view of the inner rotor oscillating vane pump of the present invention.

The specific implementation mode is as follows:

the following is a further description by way of example and with reference to the accompanying drawings.