Energy storage ejection device and energy storage ejection method based on power reflux principle

Abstract

The invention discloses an energy storage ejection device and an energy storage ejection method based on the power reflux principle, including an energy storage system and an ejection system, wherein the energy storage system includes a rotating shaft and a power source motor and a hydraulic motor connected at both ends of the rotating shaft, the hydraulic motor is equipped with a hydraulic pump connected thereto, and the displacement ratio between the hydraulic pump and the hydraulic motor can be adjusted; a front row planetary gear set is mounted on the rotating shaft, the hydraulic pump power is connected to the rear row planetary gear set, the front row planetary gear set and the rear row planetary gear set are connected by a transmission shaft power, and the output power of the power source motor can be transmitted back to the rotating shaft via the rotating shaft → the front row planetary gear set → the rear row planetary gear set → the hydraulic pump → the hydraulic motor; the power output end of the rear row planetary gear set is connected to the power input end of the ejection system. The beneficial effect of the invention is: it aims to provide an energy storage ejection device with a large power-to-volume ratio and a controllable energy release rate.

Description

Technical Field

[0001] The invention relates to the technical field of energy storage ejection, and in particular to an energy storage ejection device and an energy storage ejection method based on the power reflux principle. Background Art

[0002] In some energy conversion systems, a high initial velocity is often obtained through a high-power power source. However, the high-power power source has the problems of large size and high weight during actual use, and is easily affected by environmental factors.

[0003] In order to solve the above problems, a relatively small and light energy storage device is often used in an energy storage ejection device to replace a high-power power source. The energy storage ejection device includes an energy storage device and an ejection release device, wherein the energy storage device can store relatively low power input and can output a large power in a short time when needed. The ejection release device can enable the ejected object to output power at a more reasonable and controllable acceleration, thereby reducing the requirements for the structural strength of the ejection object.

[0004] Relatively small and low-weight energy storage devices generally use ultra-high speed inertial flywheel energy storage, hydraulic energy storage and spring energy storage. Among them, the ultra-high speed inertial flywheel energy storage method is a storage method that relies on torque growth to increase storage power, and its safety and processability need to be improved. The controllability of the energy release rate of hydraulic energy storage and spring energy storage methods needs to be improved. The ejection release device generally uses electromagnetic and steam ejection methods. These ejection devices have the disadvantages of large size, low energy utilization rate, and uncontrollable energy release rate. Summary of the invention

[0005] In view of this, the invention provides an energy storage ejection device based on the power reflux principle, aiming to provide an energy storage ejection device with a large power-to-volume ratio and a controllable energy release rate.

[0006] To achieve the above purpose, the technical solution of the invention is as follows:

[0007] An energy storage ejection device based on the power reflux principle comprises an energy storage system and an ejection system, characterized in that: the energy storage system comprises a rotating shaft and a power source motor and a hydraulic motor which are power-connected at both ends of the rotating shaft, the hydraulic motor is provided with a hydraulic pump which is connected thereto, and the displacement ratio between the hydraulic pump and the hydraulic motor can be adjusted; a front planetary gear set is mounted on the rotating shaft, the hydraulic pump is power-connected with a rear planetary gear set, the front planetary gear set and the rear planetary gear set are power-connected via a transmission shaft, and the output power of the power source motor can be transmitted back to the rotating shaft via the rotating shaft→front planetary gear set→rear planetary gear set→hydraulic pump→hydraulic motor; the power output end of the rear planetary gear set is power-connected with the power input end of the ejection system, and the ejection system is used to release the energy stored in the energy storage system.

[0008] The above structure is adopted, based on the characteristics of power splitting and converging of the planetary gear set, a power return transmission path is constructed between the power source motor and the hydraulic motor, so that the output power of the power source motor can be returned to the rotating shaft through the rotating shaft → front planetary gear set → rear planetary gear set → hydraulic pump → hydraulic motor, and the low power output of the power source motor is continuously accumulated by using the principle of reflux power accumulation. When the accumulated stored power meets the requirements, the stored power is output to the ejection system through the cooperation of the front planetary gear set and the rear planetary gear set.

[0009] Preferably, the front planetary gear set includes a front ring gear and a front sun gear fixedly mounted on a rotating shaft, a front planetary gear is arranged between the front sun gear and the front ring gear, the front ring gear is fixedly mounted, and one end of the transmission shaft is fixedly mounted on the front planetary gear. With the above structure, power is transmitted to the front sun gear → the front planetary gear in sequence through the rotating shaft, and then transmitted to the rear planetary gear set through the transmission shaft.

[0010] Preferably, the rear planetary gear set includes a rear ring gear and a rear sun gear connected to the hydraulic pump, a rear planetary gear is arranged between the rear sun gear and the rear ring gear, the rear ring gear is connected to the power input end of the ejection system, and the end of the transmission shaft away from the front planetary gear is fixed on the rear planetary gear; the rear sun gear is rotatably sleeved on the rotating shaft. With the above structure, power is transmitted to the rear planetary gear through the transmission shaft, and will be divided to the rear ring gear and the rear sun gear respectively, and the power transmitted to the rear sun gear will be delivered to the hydraulic pump. If the rear ring gear cannot rotate, the output power of the power source motor will continue to converge and accumulate.

[0011] Preferably, the ejection system includes a guide rail and a roller device, the guide rail is provided with a push rod that can slide forward and backward, a brake is provided at the starting point of the guide rail, the roller device moves the push rod by pulling the steel cable, and the roller device is driven by the rear gear ring. With the above structure, after the brake is turned on, the power accumulated in the energy storage system will be released through the rear gear ring, and the rear gear ring drives the roller device to rotate, quickly tightening the steel cable, giving tension to the push rod, so that the push rod slides along the guide rail.

[0012] Preferably, the hydraulic pump is a variable hydraulic pump, which is connected to the hydraulic motor through a hydraulic oil pipe. With the above structure, the power input to the variable hydraulic pump pressurizes the oil in the variable hydraulic pump and then sends it to the hydraulic motor through the hydraulic oil pipe.

[0013] As a preference: a guide pulley is fixedly arranged on the ejection system, and the guide pulley is used to change the direction of the steel cable. With the above structure, the arrangement direction of the steel cable can be increased, and the design flexibility is increased.

[0014] The present invention also provides an energy storage ejection method implemented by an energy storage ejection device based on the power reflux principle, characterized in that it comprises the following steps:

[0015] S1: Return the push rod to the starting position and close the brake to lock the push rod;

[0016] S2: Adjust the initial displacement ratio of the hydraulic pump and the hydraulic motor so that the output speed of the hydraulic motor is equal to the output speed of the power source motor;

[0017] S3: Turn on the power source motor to store energy until the energy storage reaches the requirement;

[0018] S4: Adjust the displacement ratio of the hydraulic pump and the hydraulic motor so that the output power of the rear gear ring meets the requirements;

[0019] S5: Release the brake to release energy.

[0020] By adopting the above method, the power output by the power source motor can be accumulated until the accumulated power in the energy storage system reaches the requirement, and all the accumulated power can be output through the rear ring gear in a short time, and the energy release rate can be controlled by the displacement ratio of the hydraulic pump and the hydraulic motor.

[0021] As a preferred embodiment, the power source motor is in a constant speed control state during the energy storage process. Since the input speed of the power source motor in step S2 is equal to the output of the hydraulic motor, it is necessary to ensure that the following formula is satisfied:

[0022]

[0023] in:

[0024] k1—the ratio of the number of teeth of the front sun gear to the number of teeth of the front ring gear;

[0025] k2—Ratio of the number of teeth of the rear sun gear to the rear ring gear;

[0026] ε0—Initial displacement ratio of hydraulic pump and hydraulic motor.

[0027] The above method ensures that the input power and the return power are combined at the front sun gear of the front planetary gear set.

[0028] As a preferred method: in the power storage stage, according to the transmission principle of the planetary gear set, the following formula can be obtained:

[0029] n 2s +k2n 2r -(1+k2)n 2p =0

[0030] in:

[0031] n 2s - Speed ​​of the rear sun gear;

[0032] n 2r - speed of rear ring gear;

[0033] n 2p —Speed ​​of the rear planetary gear.

[0034] Using the above method, the parameters of the gears in the planetary gear set during the power storage phase can be obtained:

[0035] As a preferred embodiment, the following formula can be obtained according to the structure of the energy storage system (1a):

[0036] n 2s =ε·n i

[0037] in:

[0038] ε—displacement ratio of the hydraulic pump (3) to the hydraulic motor (2).

[0039] Compared with the prior art, the invention has the following beneficial effects:

[0040] The energy storage system constructs a power reflux transmission path between the power source motor and the hydraulic motor through the front planetary gear set and the rear planetary gear set, wherein the hydraulic motor is connected to the hydraulic pump, and the power output by the power source motor passes through the rotating shaft → the front planetary gear set → the rear planetary gear set → the hydraulic pump, the hydraulic motor, and finally is transmitted back to the rotating shaft again, and is accumulated with the power output by the power source motor for energy storage. After the energy storage is completed, the energy release rate can be controlled by adjusting the displacement ratio between the hydraulic pump and the hydraulic motor, and the accumulated energy storage power can be released to the ejection system in a controllable manner. This makes the energy storage ejection device based on the power reflux principle have the advantages of a large power-to-volume ratio and a controllable energy release rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of an energy storage ejection device based on the power reflux principle (only the operating principle of the planetary gear set is shown);

[0042] Figure 2 Schematic diagram of power accumulation flow of energy storage system 1a (only showing the operating principle of the planetary gear set);

[0043] Figure 3 Schematic diagram of power release flow of energy storage system 1a (only showing the operating principle of the planetary gear set);

[0044] Figure 4 is a schematic diagram of the structure of the ejection system 2a;

[0045] Figure 5 The present invention is a flow chart of an energy storage ejection method implemented by an energy storage ejection device based on the power reflux principle. DETAILED DESCRIPTION

[0046] The invention is further described below with reference to the embodiments and the accompanying drawings.

[0047] Embodiment 1

[0048] like Figure 1 and Figure 4As shown, an energy storage ejection device based on the power reflux principle includes an energy storage system 1a and an ejection system 2a. The energy storage system 1a includes a housing 5 fixedly mounted on the outside, a rotating shaft 6, and a power source motor 1 and a hydraulic motor 2 connected to both ends of the rotating shaft 6. The hydraulic motor 2 is equipped with a hydraulic pump 3. The hydraulic pump 3 is interconnected with the hydraulic motor 2 through a hydraulic oil pipe. The output speed of the hydraulic motor 2 can be controlled by adjusting the displacement ratio between the hydraulic pump 3 and the hydraulic motor 2. In this embodiment, the hydraulic pump 3 is a variable hydraulic pump. The variable hydraulic pump and the hydraulic motor 2 are both prior art and will not be described in detail here. The rotating shaft 6 is equipped with a front planetary gear set b1, and the hydraulic pump 3 is connected to the rear planetary gear set b2. The front planetary gear set b1 and the rear planetary gear set b2 are connected to each other through the transmission shaft 4, and the front planetary gear set b1 and the rear planetary gear set b2 form a power return path: the output power of the power source motor 1 can be transmitted back to the rotating shaft 6 via the rotating shaft 6 → the front planetary gear set b1 → the rear planetary gear set b2 → the hydraulic pump 3 → the hydraulic motor 2. The power output end of the rear planetary gear set b2 is connected to the power input end of the ejection system 2a, and the ejection system 2a is used to release the energy stored in the energy storage system 1a.

[0049] Based on the above design, when the power input end of the ejection system 2a is locked, the power generated by the power source motor 1 is sequentially transmitted through the rotating shaft 6 → the front planetary gear set b1 → the transmission shaft 4 → the rear planetary gear set b2 → the hydraulic pump 3 → the hydraulic motor 2, and then returned to the rotating shaft 6 to merge with the power generated by the power source motor 1, thereby forming a power reflux transmission path, so that the power generated by the power source motor 1 can be continuously accumulated. When the power input end of the ejection system 2a is released, the power accumulated in the energy storage system 1a can be released to the ejection system 2a through the power output end of the rear planetary gear set b2, and the energy release rate can be controlled by adjusting the displacement ratio between the hydraulic pump 3 and the hydraulic motor 2.

[0050] like Figure 1 , Figure 2 and Figure 3As shown, the front planetary gear set b1 includes a front sun gear b11 and a front ring gear b12 fixedly sleeved on the rotating shaft 6, and a front planetary gear b13 meshing with each other is arranged between the front sun gear b11 and the front ring gear b12, and the front ring gear b12 is locked on the housing 5 through a spline. The rear planetary gear set b2 includes a rear sun gear b21 and a rear ring gear b22 that are power-connected to the hydraulic pump 3, and a rear planetary gear b23 that cooperates with each other is meshed between the rear sun gear b21 and the rear ring gear b22, and the rear ring gear b22 is power-connected with the power input end of the ejection system 2a, the front planetary gear b13 and the rear planetary gear b23 are respectively fixedly mounted on both ends of the transmission shaft 4, and the rear sun gear b21 is rotatably sleeved on the rotating shaft 6. Based on the above design, if the rear ring gear b22 cannot rotate, the power on the rotating shaft 6 is sequentially transmitted to the front sun gear b11 → front planetary gear b13 → transmission shaft 4 → rear planetary gear b23 → rear sun gear b21 → hydraulic pump 3 → hydraulic motor 2, and then transmitted back to the rotating shaft 6 to establish a reflux path to achieve power reflux accumulation. If the rear ring gear b22 can rotate, the transmitted power will be diverted at the rear planetary gear b23, and part of the power transmitted to the rear planetary gear b23 will be sequentially transmitted to the rear ring gear b22, and finally transmitted to the ejection system 2a; the other part of the power transmitted to the rear planetary gear b23 will be sequentially transmitted to the rear sun gear b21 → hydraulic pump 3 → hydraulic motor 2, and then transmitted back to the rotating shaft 6.

[0051] like Figure 4 As shown, the ejection system 2a includes a guide rail 21a and a roller device 24a. The guide rail 21a is provided with a push rod 22a that can slide forward and backward. The starting point of the guide rail 21a is provided with a brake 23a. The roller device 24a moves by pulling the push rod 22a through the steel cable 25a. The roller device 24a is driven by the rear gear ring b22. The rear gear ring b22 is connected to the roller device 24a through a flange, so that the rotation of the rear gear ring b22 can synchronously drive the roller device 24a to rotate. The ejection system 2a is fixed with a guide pulley 26a, which is used to change the direction of the steel cable 25a, and can increase the arrangement direction of the steel cable 25a, thereby increasing the design flexibility. Based on the above design, the brake 23a is opened, so that the energy storage system 1a can release energy, the rotation of the rear gear ring b22 synchronously drives the roller device 24a to rotate, the steel cable 25a is tightened, and the push rod 22a is pulled to slide, and the push rod 22a is used to drive the projectile 27a.

[0052] Embodiment 2

[0053] like Figure 5 As shown, an energy storage ejection method implemented by the energy storage ejection device based on the power reflux principle described in Example 1 is as follows:

[0054] S1: restore the push rod 22a to the starting position, and close the brake 23a to lock the push rod 22a;

[0055] S2: Adjust the displacement ratio of the hydraulic pump 3 and the hydraulic motor 2, and the input speed n of the power source motor 1 i The output n of the hydraulic motor 7 p equal;

[0056] S3: Turn on the power source motor 1 to store energy until the energy storage reaches the requirement;

[0057] S4: adjusting the displacement ratio of the hydraulic pump 3 and the hydraulic motor 2 so that the output speed of the hydraulic motor 2 meets the requirement, and thus the output power of the rear gear ring b22 meets the requirement;

[0058] S5: Release the brake 23a to release energy.

[0059] Based on the above method, the power output by the power source motor 1 can be continuously accumulated until the accumulated power in the energy storage system 1a reaches the requirement, and all the accumulated power can be output through the rear ring gear b22 in a short time, and the energy release rate can be controlled by the displacement ratio of the hydraulic pump 3 and the hydraulic motor 2.

[0060] In the specific implementation, step S3 includes: in order to realize energy storage, the power source motor 1 is in a constant speed control state during the energy storage process. Since the power source motor 1 inputs a speed n in step S2 i The output n of the hydraulic motor 2 p equal, thus ensuring that the input power and the return power are combined at the front sun gear b11 of the front planetary gear set b1. In other words, it is necessary to ensure that the following formula is satisfied:

[0061]

[0062] in:

[0063] k1—the ratio of the number of teeth of the front sun gear b11 to the front ring gear b12;

[0064] k2—tooth ratio of rear sun gear b21 to rear ring gear b22;

[0065] ε0—initial displacement ratio of hydraulic pump 3 and hydraulic motor 2.

[0066] Furthermore, during the power transmission process, if the input power is greater than the power loss caused by friction of the entire energy storage system 1a, the accumulated power inside the energy storage system 1a will quickly increase until the input power is equal to the power loss, and the accumulated power reaches the maximum value. At the same time, because the power source motor 1 is in a constant speed control state, the output torque of the rear gear ring b22 rises rapidly following the rapid increase of the reflux power. However, due to the locking limitation of the ejection system 2a, the output speed of the entire energy storage system 1a is zero, and it is in the power storage stage.

[0067] During the power storage phase, please refer to Figure 2 , the transmission principle of the planetary gear set can be known as the following formula:

[0068] n 2s +k2n 2r -(1+k2)n 2p =0

[0069] in:

[0070] n 2s - Speed ​​of rear sun gear b21;

[0071] n 2r - speed of rear ring gear b22;

[0072] n 2p —Speed ​​of rear planetary gear b23.

[0073] Also, please refer to Figure 2 , according to the structure of energy storage system 1a, the following formula can be obtained:

[0074] n 2s =ε·n i

[0075] in:

[0076] ε—displacement ratio of hydraulic pump 3 and hydraulic motor 2.

[0077] According to the formula derived from the planetary gear set transmission principle and the formula derived from the energy storage system 1a structure, it can be seen that: Figure 3 , when the speed n of the rear planetary gear set b2 and the power source motor 1 2p and n i Under the condition that the displacement ratio ε of the hydraulic pump 3 and the hydraulic motor 2 remains unchanged, the speed n of the rear sun gear b21 can be changed 2s , and finally achieve the speed n of the rear ring gear b22 2r , and the rotation speed n of the roller device 24a o The change of the power distribution of the planetary gear set is utilized to realize the controllable release of the energy storage power, so that the entire device enters the ejection release state.

[0078] Finally, it should be noted that the above description is only a preferred embodiment of the invention. Under the inspiration of the invention, ordinary technicians in this field can make a variety of similar expressions without violating the purpose of the invention and the claims, and such changes fall within the scope of protection of the invention.

Claims

1. An energy storage ejection method implemented by an energy storage ejection device based on the power reflux principle, comprising an energy storage system (1a) and an ejection system (2a), wherein the energy storage system (1a) comprises a rotating shaft (6) and a power source motor (1) and a hydraulic motor (2) connected to both ends of the rotating shaft (6), wherein the hydraulic motor (2) is provided with a hydraulic pump (3) connected thereto, and the displacement ratio between the hydraulic pump (3) and the hydraulic motor (2) can be adjusted; The rotating shaft (6) is equipped with a front planetary gear set (b1), the hydraulic pump (3) is connected to the rear planetary gear set (b2), the front planetary gear set (b1) and the rear planetary gear set (b2) are connected to each other through a transmission shaft (4), and the output power of the power source motor (1) can be transmitted back to the rotating shaft (6) via the rotating shaft (6) → the front planetary gear set (b1) → the rear planetary gear set (b2) → the hydraulic pump (3) → the hydraulic motor (2); The ejection system (2a) comprises a guide rail (21a) and a roller device (24a), wherein a push rod (22a) which can slide forward and backward is mounted on the guide rail (21a), a brake (23a) is arranged at the starting point of the guide rail (21a), the roller device (24a) moves by pulling the push rod (22a) through a steel cable (25a), and the roller device (24a) is driven by a rear gear ring (b22); The power output end of the rear planetary gear set (b2) is connected to the power input end of the ejection system (2a) by power, and the ejection system (2a) is used to release the energy stored in the energy storage system (1a); The front planetary gear set (b1) comprises a front ring gear (b12) and a front sun gear (b11) fixedly sleeved on a rotating shaft (6); a front planetary gear (b13) is arranged between the front sun gear (b11) and the front ring gear (b12); the front ring gear (b12) is fixedly installed, and one end of the transmission shaft (4) is fixedly mounted on the front planetary gear (b13); The rear planetary gear set (b2) comprises a rear ring gear (b22) and a rear sun gear (b21) which is connected to the hydraulic pump (3) by power, a rear planetary gear (b23) is arranged between the rear sun gear (b21) and the rear ring gear (b22), the rear ring gear (b22) is connected to the power input end of the ejection system (2a), and one end of the transmission shaft (4) away from the front planetary gear (b13) is fixed on the rear planetary gear (b23); the rear sun gear (b21) is rotatably mounted on the rotating shaft (6); The method is, The following steps are involved: S1: restore the push rod (22a) to the initial position and close the brake (23a) to lock the push rod (22a); S2: adjusting the initial displacement ratio of the hydraulic pump (3) and the hydraulic motor (2) so that the output speed of the hydraulic motor (2) is equal to the output speed of the power source motor (1); S3: starting the power source motor (1) to store energy, wherein the power source motor (1) is in a constant speed control state during the energy storage process until the energy storage reaches the required level; during the power transmission process, the input power is required to be greater than the power loss caused by friction of the entire energy storage system (1a) until the input power is equal to the power loss; S4: adjusting the displacement ratio of the hydraulic pump (3) and the hydraulic motor (2) so that the output power of the rear ring gear (b22) reaches the required level; S5: releasing the brake (23a) to release energy, during which the displacement ratio between the hydraulic pump (3) and the hydraulic motor (2) is adjusted and controlled.

2. The energy storage ejection method implemented by the energy storage ejection device based on the power reflux principle according to claim 1 is characterized in that: The hydraulic pump (3) is a variable hydraulic pump, and the variable hydraulic pump is interconnected with the hydraulic motor (2) via a hydraulic oil pipe.

3. The energy storage ejection method implemented by the energy storage ejection device based on the power reflux principle according to claim 1 is characterized in that: The ejection system (2a) is fixedly provided with a guide pulley (26a), and the guide pulley (26a) is used to change the direction of the steel cable (25a).

4. The energy storage ejection method implemented by the energy storage ejection device based on the power reflux principle according to claim 1 is characterized in that: The following formula is required: in: k1—the ratio of the number of teeth of the front sun gear (b11) to the front ring gear (b12); k2—tooth ratio of the rear sun gear (b21) to the rear ring gear (b22); ε0—initial displacement ratio of the hydraulic pump (3) to the hydraulic motor (2).

5. The energy storage ejection method implemented by the energy storage ejection device based on the power reflux principle according to claim 4 is characterized in that: In the power storage stage, according to the transmission principle of the planetary gear set, the following formula can be obtained: n 2s +k2n 2r -(1+k2)n 2p =0 in: n 2s - speed of the rear sun gear (b21); n 2r - speed of the rear ring gear (b22); n 2p —Speed ​​of the rear planetary gear (b23).

6. The energy storage ejection method implemented by the energy storage ejection device based on the power reflux principle according to claim 5 is characterized in that: According to the structure of energy storage system (1a), the following formula can be obtained: n 2s =e·n i in: ε—displacement ratio of the hydraulic pump (3) to the hydraulic motor (2); n i — Input speed of the power source motor (1).

Images