Multi-stage cycloid internal gear pump capable of providing different flows and adapting to different loads

Abstract

The invention discloses a multi-stage cycloid internal gear pump capable of providing different flows and adapting to different loads, which is characterized by comprising a shell and three or more cycloid internal gear pumps which are positioned in the shell and are connected in parallel, and the three or more cycloid internal gear pumps are connected in series through a transmission shaft; a transmission gear is arranged at one end of the transmission shaft; when the transmission gear drives the transmission shaft to rotate, each cycloid internal gear pump outputs oil according to the pressure corresponding to the load and the required flow; the pressure and the flow between the cycloid internal gear pumps are not mutually influenced; and the output ends of the cycloid internal gear pumps are combined together. One hydraulic pump can output oil liquid with different flows at the same time and adapt to loads with different pressures at the same time, a solution is provided for the requirement that one hydraulic pump in an aircraft cooling system needs to output oil liquid with different flows at the same time, and the aircraft cooling system is simplified and integrated.

Description

Technical Field

[0001] The invention relates to a hydraulic pump technology for an aircraft cooling system, in particular to a multi-stage cycloid internal meshing gear pump that provides different flow rates and adapts to different loads. Background Art

[0002] In the aircraft cooling system, the flowing oil absorbs the heat in the electromechanical system and brings it to the heat dissipation pipe through the pipe, and then the oil is cooled by air cooling. The cooled oil is then pumped into the electromechanical system by the hydraulic pump to absorb heat. This reciprocating cycle realizes the cooling of the aircraft electromechanical system. The hydraulic pump is an energy element in the hydraulic transmission system. Its function is to provide the system with oil of a certain pressure and flow rate, and is a device that converts mechanical energy into hydraulic energy. Most existing hydraulic pumps can only output one flow rate of hydraulic oil at the same time. Even if the pressure and flow rate can be adjusted, there is only one output flow rate. For example, the patent publication number is CN111486089A, a high-pressure cycloid internal meshing gear pump, including a housing, an inner rotor shaft, a bearing, an outer rotor and a pressure compensation device. This structure can handle problems such as no pressure compensation measures and low working pressure. At present, in the aircraft cooling system, there is an urgent need for a hydraulic pump that can provide multiple different flow rates of oil at the same time to achieve the simplification and high integration of the aircraft cooling system. This is also a technical difficulty that needs to be solved in aerospace. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and to design a multi-stage cycloid internal gear pump that provides different flow rates and adapts to different loads. It has the advantages of improving the simplification and integration of the cooling system, and meeting the requirements that a hydraulic pump can simultaneously output oil of different flow rates and adapt to loads of different pressures.

[0004] The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions: a multi-stage cycloid internal gear pump that provides different flow rates and adapts to different loads, characterized in that it includes a shell, three or more cycloid internal gear pumps connected in parallel and located inside the shell, and the three or more cycloid internal gear pumps are connected in series through a transmission shaft; a transmission gear is provided at one end of the transmission shaft.

[0005] When the transmission gear drives the transmission shaft to rotate, each cycloid internal gear pump outputs oil according to the load corresponding pressure and required flow.

[0006] The pressure and flow rate of each cycloid internal gear pump do not affect each other.

[0007] The output ends of the cycloid internal gear pumps are connected or connected together.

[0008] In the aforementioned multi-stage cycloidal internal gear pump that provides different flow rates and adapts to different loads, preferably, the three or more cycloidal internal gear pumps connected in parallel are provided with intermediate plates to isolate adjacent cycloidal internal gear pumps, and the outer sides of the cycloidal internal gear pumps at the edges are respectively provided with top plates and bottom plates, and independent oil chambers are formed by adjacent intermediate plates, and the intermediate plates and the top plates or bottom plates.

[0009] In the aforementioned multi-stage cycloid internal gear pump that provides different flow rates and adapts to different loads, preferably, the three or more cycloid internal gear pumps connected in parallel include an inner rotor and an outer rotor that cooperate with each other, and an eccentric sleeve located in the housing and cooperating with the inner rotor and the outer rotor.

[0010] In the aforementioned multi-stage cycloid internal gear pump that provides different flow rates and adapts to different loads, preferably, the three or more cycloid internal gear pumps connected in parallel have different structural parameters; the structural parameters include tooth shape, number of teeth, oil distribution channel, pressure pulsation, and volumetric efficiency.

[0011] In the aforementioned multi-stage cycloid internal gear pump that provides different flow rates and adapts to different loads, preferably, the gears of each cycloid internal gear pump are connected and fixed by a transmission pin and a transmission shaft.

[0012] In the aforementioned multi-stage cycloid internal gear pump that provides different flow rates and adapts to different loads, preferably, the transmission shaft is provided with a top plate at the other end relative to the transmission gear, a cover plate is provided on the outer side of the top plate, and a disc spring is provided between the top plate and the cover plate.

[0013] In the aforementioned multi-stage cycloid internal gear pump that provides different flow rates and adapts to different loads, preferably, the transmission shaft is positioned in the center hole of the top plate through a sliding bearing, and a retaining ring is provided at the end of the sliding bearing; the disc spring is arranged in the width of the top plate in the direction of the cover plate.

[0014] In the aforementioned multi-stage cycloid internal gear pump that provides different flow rates and adapts to different loads, preferably, the intermediate plate isolation, top plate, bottom plate and eccentric sleeve are connected in series into one body by a pin, and one end of the pin is positioned with the housing.

[0015] This technical solution is a special structure formed by three or more cycloid internal gear pumps connected in parallel. Three or more cycloid internal gears are strung together through the same transmission shaft to form several independently operating pump bodies. The power is input from the transmission gear at the end of the transmission shaft. The cycloid internal gear is connected to the transmission shaft through a transmission pin, with a simple structure and easy assembly. When the transmission gear drives the transmission shaft to rotate, each independently operating pump can output oil with corresponding pressure and required flow according to the load. The pressure and flow between the pumps do not affect each other. According to actual needs, the output ends of the cycloid internal gear pumps can be combined together to obtain more different flow change values ​​and adapt to different load requirements.

[0016] Compared with the prior art, the beneficial effects of the present invention are: through the parallel design of three or more cycloid internal meshing gear pumps in the same pump body, a hydraulic pump is obtained that can simultaneously output oil of different flow rates and adapt to loads of different pressures, which provides a solution for the need for a hydraulic pump in an aircraft cooling system to simultaneously output oil of multiple different flow rates, thereby simplifying and integrating the aircraft cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 yes Figure 1 AA section view.

[0019] Figure 3 yes Figure 1 Schematic diagram of the oil distribution channel structure from the middle BB to the middle plate.

[0020] In the figure: 1- flat key; 2- shaft end retaining ring; 3- sliding bearing 1; 4- transmission gear; 5- housing; 6- bottom plate; 7- pump 1; 8- pin; 9- transmission shaft; 10- pump 2; 11- pump 3; 12- cover plate; 13- washer; 14- fastening screw; 15- sealing ring; 16- retaining ring; 17- sliding bearing 2; 18- disc spring; 19- top plate; 20- first middle plate; 21- second middle plate; 22- transmission pin; 23- inner rotor; 24- outer rotor; 25- eccentric sleeve. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0022] like Figure 1 As shown, this embodiment is a multi-stage cycloid internal gear pump that provides different flow rates and adapts to different loads, including a housing 5 and three (or more than three) cycloid internal gear pumps connected in parallel in the housing 5.

[0023] Three (or more) cycloid internal gear pumps are connected in series through the same transmission shaft 9. A transmission gear 4 is arranged at one end of the transmission shaft, and the transmission gear 4 is also located within the end surface of the external flange of the housing 5.

[0024] According to actual needs, the structural parameters of three (or more than three) cycloid internal meshing gear pumps connected in parallel can be designed to be different; these structural parameters include tooth shape, number of teeth, oil distribution flow channel, pressure pulsation, volumetric efficiency, etc.

[0025] When the transmission gear 4 drives the transmission shaft 9 to rotate, each cycloid internal gear pump outputs oil according to the load corresponding pressure and required flow rate; the pressure and flow rate between each cycloid internal gear pump do not affect each other.

[0026] According to the actual situation, the output ends of each cycloid internal meshing gear pump can be connected together.

[0027] The following is an explanation of the specific structure of the pump:

[0028] Three (three are taken as examples below) cycloid internal gear pumps are connected in parallel, and intermediate plates are arranged between adjacent cycloid internal gear pumps for isolation, such as the first intermediate plate 20 and the second intermediate plate 21 shown in the figure. A top plate 19 and a bottom plate 6 are arranged on the outer sides of the cycloid internal gear pumps at the edges, respectively. An independent oil chamber is formed by the adjacent first intermediate plates 20 and second intermediate plates 21, an independent oil chamber is formed by the bottom plate 6 and the second intermediate plate 21, and an independent oil chamber is formed by the first intermediate plate 20 and the top plate 19. There are three oil chambers in total, corresponding to: pump one 7, pump two 10 and pump three 11.

[0029] like Figure 2 As shown, three cycloid internal gear pumps connected in parallel include an inner rotor 23 and an outer rotor 24 that cooperate with each other, and an eccentric sleeve 25 located in the housing 5 and cooperating with the inner rotor 23 and the outer rotor 24. The gears of each cycloid internal gear pump are connected and fixed to the transmission shaft 9 through a transmission pin 22 provided at the location, and the transmission pin 22 is a double pin structure symmetrically arranged with the transmission shaft 9 axis.

[0030] The top plate 19 is arranged at the other end of the transmission shaft 9 relative to the transmission gear 4. The outer side of the top plate 19 is provided with a cover plate 12. A sealing ring 15 is arranged between the cover plate 12 and the flange mating surface of the housing 5, and is fastened by a fastening screw 14 and a washer 13 assembled in the flange surface connection hole. A disc spring 18 is arranged between the top plate 19 and the cover plate 12. The disc spring 18 is located in the width of the top plate 19 in the direction of the cover plate 12. The disc spring 18 is a spring sheet that can keep the compression state between the pumps in real time.

[0031] Furthermore, one end of the transmission shaft 9 is positioned in the center hole of the top plate 19 through a second sliding bearing 17, and a snap ring 16 is provided at the inner end of the sliding bearing 17; the other end of the transmission shaft 9 is positioned in the center hole of the closing part of the housing 5 through a first sliding bearing 13, and the transmission gear 4 is located outside the closing part. The transmission gear 4 is connected to the transmission shaft 9 through a symmetrical double flat key 1, and a shaft end retaining ring 2 is provided on the transmission shaft 9 outside the transmission gear 4.

[0032] Furthermore, the first middle plate 20, the second middle plate 21, the top plate 19 and the bottom plate 6 are connected together by a pin 8. Figure 3 As shown, one end of the pin 8 facing the transmission gear 4 is positioned with the inner end surface of the closing portion of the housing 5 in the form of an axial hole structure. Figure 3 At the same time, the oil distribution channel structure on the second middle plate 21 is shown.

[0033] Working principle:

[0034] Each pump, pump 1 7, pump 2 10, and pump 3 11, can independently output a flow rate of oil. The power is transmitted to the transmission shaft 9 through the driven gear 4 at the end of the transmission shaft 9, and the transmission shaft 9 then transmits the torque to the cycloid internal gear pump through the transmission pin 22 on the transmission shaft 9. Each cycloid internal gear pump rotates continuously under the drive of the transmission pin 22, thereby outputting a certain flow rate of oil. The speed of each cycloid internal gear pump is the same, but the structural parameters of each pump are different, so each pump will output a different flow rate of oil, thereby meeting the demand that a hydraulic pump in the aircraft cooling system can output multiple different flow rates of oil at the same time.

[0035] The above embodiments are explanations of the present invention, not limitations of the present invention. Although the present invention is described in conjunction with the preferred embodiments, it should be understood that the present invention is not limited to the preferred embodiments. Those skilled in the art can make various equivalent modifications and substitutions to the technical solutions of the present invention based on the teachings of the present invention. Therefore, the scope of the present invention should be limited by the claims, and all those equivalent modifications and substitutions belong to the protection scope of the technical solutions of the present invention.

Claims

1. A multi-stage cycloid internal gear pump that provides different flow rates and adapts to different loads, characterized in that It comprises a housing (5), and three or more cycloid internal gear pumps connected in parallel in the housing, wherein the three or more cycloid internal gear pumps are connected in series via a transmission shaft (9); a transmission gear (4) is provided at one end of the transmission shaft; When the transmission gear drives the transmission shaft to rotate, each cycloid internal gear pump outputs oil according to the load corresponding pressure and required flow; The pressure and flow rate of each cycloid internal gear pump do not affect each other; The output ends of the cycloid internal gear pumps are connected or connected together.

2. The multi-stage cycloid internal gear pump providing different flow rates and adapting to different loads according to claim 1, characterized in that: The three or more cycloid internal gear pumps connected in parallel are provided with intermediate plates for isolation between adjacent cycloid internal gear pumps, and top plates (19) and bottom plates (6) are provided on the outer sides of the cycloid internal gear pumps at the edges, and independent oil chambers are formed by adjacent intermediate plates, the intermediate plates and the top plates or the bottom plates.

3. The multi-stage cycloid internal gear pump providing different flow rates and adapting to different loads according to claim 1 or 2, characterized in that: The three or more cycloid internal meshing gear pumps connected in parallel comprise an inner rotor (23) and an outer rotor (24) that cooperate with each other, and an eccentric sleeve (25) located in a housing (5) and cooperating with the inner rotor and the outer rotor.

4. The multi-stage cycloid internal gear pump providing different flow rates and adapting to different loads according to claim 1 or 2, characterized in that: The three or more cycloid internal meshing gear pumps connected in parallel have different structural parameters; the structural parameters include tooth shape, number of teeth, oil distribution channel, pressure pulsation, and volumetric efficiency.

5. The multi-stage cycloid internal gear pump providing different flow rates and adapting to different loads according to claim 1, characterized in that: The gear of each cycloid internal meshing gear pump is connected and fixed via a transmission pin (22) and a transmission shaft (9).

6. The multi-stage cycloid internal gear pump providing different flow rates and adapting to different loads according to claim 1, characterized in that: The other end of the transmission shaft (9) relative to the transmission gear (4) is provided with a top plate (19), the outer side of the top plate is provided with a cover plate (12), and a disc spring (18) is provided between the top plate and the cover plate.

7. The multi-stage cycloid internal gear pump providing different flow rates and adapting to different loads according to claim 6, characterized in that: The transmission shaft (9) is positioned in the center hole of the top plate (19) through a sliding bearing, and a snap ring (16) is provided at the end of the sliding bearing; the disc spring (18) is arranged in the width of the top plate in the direction of the cover plate.

8. The multi-stage cycloid internal gear pump providing different flow rates and adapting to different loads according to claim 3, characterized in that: The intermediate plate isolation, the top plate (19), the bottom plate (6) and the eccentric sleeve (25) are connected in series by a pin (8) and one end of the pin is positioned with the housing (5).

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