阅读说明：本技术 降低电动泵起动扭矩的控制装置 (Control device for reducing starting torque of electric pump ) 是由 刘雨 石显运 邓明 刘雪波 唐赛 于 2021-06-25 设计创作，主要内容包括：本发明公开了一种降低电动泵起动扭矩的控制装置,包括电机(1),电机(1)的输出端设有变量泵(2),变量泵(2)通过单向阀(10)连接主液压系统(11),单向阀(10)通过管道(31)连接主液压系统(11),管道(31)上设有压力传感器(8)、电磁换向阀(5)和蓄压器(9),压力传感器(8)通过控制器(6)连接电机(1),电磁换向阀(5)通过随动活塞(4)连接变量泵(2),电磁换向阀(5)连接控制器(6),变量泵(2)上设有回位活塞(3)。本发明具有能降低电动泵起动扭矩的优点,可延长辅助液压系统使用寿命以及提高辅助液压系统可靠性。(The invention discloses a control device for reducing starting torque of an electric pump, which comprises a motor (1), wherein a variable pump (2) is arranged at the output end of the motor (1), the variable pump (2) is connected with a main hydraulic system (11) through a one-way valve (10), the one-way valve (10) is connected with the main hydraulic system (11) through a pipeline (31), a pressure sensor (8), an electromagnetic reversing valve (5) and a pressure accumulator (9) are arranged on the pipeline (31), the pressure sensor (8) is connected with the motor (1) through a controller (6), the electromagnetic reversing valve (5) is connected with the variable pump (2) through a follow-up piston (4), the electromagnetic reversing valve (5) is connected with the controller (6), and a return piston (3) is arranged on the variable pump (2). The invention has the advantages of reducing the starting torque of the electric pump, prolonging the service life of the auxiliary hydraulic system and improving the reliability of the auxiliary hydraulic system.)

1. A control device for reducing the starting torque of an electric pump, characterized in that: including motor (1), the output of motor (1) is equipped with variable pump (2), main hydraulic system (11) are connected through check valve (10) to variable pump (2), main hydraulic system (11) are connected through pipeline (31) in check valve (10), be equipped with pressure sensor (8) on pipeline (31), solenoid directional valve (5) and accumulator (9), motor (1) are connected through controller (6) in pressure sensor (8), variable pump (2) are connected through follow-up piston (4) in solenoid directional valve (5), solenoid directional valve (5) connection director (6), be equipped with return piston (3) on variable pump (2).

2. The control device for reducing starting torque of an electric pump according to claim 1, characterized in that: and an orifice (7) is arranged between the electromagnetic directional valve (5) and the one-way valve (10).

3. The control device for reducing starting torque of an electric pump according to claim 1, characterized in that: the variable displacement pump is characterized by further comprising a shell (22) for coating a swash plate assembly (12) of the variable displacement pump (2), the servo piston (4) and the return piston (3) are respectively located on two sides of the swash plate assembly (12), an adjusting plug (13) connected with the shell (22) is arranged on the outer side of the servo piston (4), an oil cavity (23) is formed between the servo piston (4) and the adjusting plug (13), the return piston (3) is connected with a spring seat (21) through a return spring (20), and the spring seat (21) is fixed with the shell (22); one port of the electromagnetic directional valve (5) is connected with the oil cavity (23), and the other port of the electromagnetic directional valve (5) is connected with the inner cavity of the shell (22).

4. The control device for reducing starting torque of an electric pump according to claim 3, characterized in that: the electromagnetic reversing valve (5) is positioned on the outer side of the shell (22) and comprises a hollow control valve body (15), one end of the control valve body (15) is provided with a sealing plug (14), a reversing valve sleeve (16) is arranged in the control valve body (15), a reversing valve core (17) is arranged in the reversing valve sleeve (16), one side of the reversing valve core (17) is provided with an electromagnet (19), and the reversing valve core (17) is provided with a return spring (18) connected with the electromagnet (19);

a first oil way (24) connected with the one-way valve (10) is arranged in the electromagnetic directional valve (5); a first cavity (25) is formed between the reversing valve sleeve (16) and the control valve body (15), the first cavity (25) is connected with the oil cavity (23) through a first through hole (26), a second through hole (27) and a third through hole (30) which are connected with the first cavity (25) are arranged on the reversing valve sleeve (16), an annular groove (28) with one end connected with the second through hole (27) is arranged on the reversing valve core (17), the other end of the annular groove (28) is connected with the first oil way (24), and the first through hole (26), the first cavity (25), the second through hole (27) and the first annular groove (28) form a second oil way; a third oil duct (29) is arranged in the reversing valve core (17), one end of the third oil duct (29) is located on one side of the third through hole (30), and the other end of the third oil duct (29) is connected with an inner cavity of the shell (22).

Technical Field

The invention belongs to the field of control devices of helicopter electric pumps, and particularly relates to a control device for reducing starting torque of a helicopter electric pump.

Background

The hydraulic system of the helicopter is composed of a main hydraulic system and an auxiliary hydraulic system, the auxiliary hydraulic system supplies oil to the main hydraulic system to ensure the pressure of the main hydraulic system when the main hydraulic system is subjected to pressure drop, and provides power when the helicopter retracts and retracts the blades and the tail rotor to ensure that the helicopter retracts and retracts normally. The auxiliary hydraulic system mainly comprises an electric pump (the electric pump comprises a fixed displacement pump and a motor) and related hydraulic elements, the start and stop of the electric pump are controlled by monitoring the system pressure, oil is supplied to the hydraulic system, and the electric pump is always in a frequent on-load starting working condition. When the electric pump is started with load, oil films of all friction pairs of the auxiliary hydraulic system are not established, the damping effect of all the friction pairs and oil is large, so that the starting torque to be overcome by the motor is large, particularly under the low-temperature working condition, the viscosity of the oil is low, the required starting torque is large, the starting instantaneous current of the motor is too high, the transmission shaft is possibly broken, the motor is possibly damaged, the auxiliary hydraulic system fails, oil can not be supplied to the hydraulic system, and even safety accidents are caused in severe cases. Therefore, a control device for reducing the starting torque of the electric pump is needed, which is significant for prolonging the service life of the auxiliary hydraulic system and improving the reliability of the auxiliary hydraulic system.

Disclosure of Invention

The invention aims to provide a control device for reducing starting torque of an electric pump. The invention has the advantages of reducing the starting torque of the electric pump, prolonging the service life of the auxiliary hydraulic system and improving the reliability of the auxiliary hydraulic system.

The technical scheme of the invention is as follows: the control device for reducing the starting torque of the electric pump comprises a motor, wherein a variable pump is arranged at the output end of the motor and is connected with a main hydraulic system through a one-way valve, the one-way valve is connected with the main hydraulic system through a pipeline, a pressure sensor, an electromagnetic directional valve and a pressure accumulator are arranged on the pipeline, the pressure sensor is connected with the motor through a controller, the electromagnetic directional valve is connected with the variable pump through a follow-up piston, the electromagnetic directional valve is connected with a controller, and a return piston is arranged on the variable pump.

In the control device for reducing the starting torque of the electric pump, an orifice is provided between the electromagnetic directional valve and the check valve.

The control device for reducing the starting torque of the electric pump further comprises a shell for coating the swash plate assembly of the variable displacement pump, the servo piston and the return piston are respectively positioned on two sides of the swash plate assembly, the outer side of the servo piston is provided with an adjusting plug connected with the shell, an oil cavity is formed between the servo piston and the adjusting plug, the return piston is connected with a spring seat through a return spring, and the spring seat is fixed with the shell; one port of the electromagnetic reversing valve is connected with the oil cavity, and the other port of the electromagnetic reversing valve is connected with the inner cavity of the shell.

In the control device for reducing the starting torque of the electric pump, the electromagnetic directional valve is located on the outer side of the shell and comprises a hollow control valve body, one end of the control valve body is provided with a sealing plug, a directional valve sleeve is arranged in the control valve body, a directional valve core is arranged in the directional valve sleeve, one side of the directional valve core is provided with an electromagnet, and a reset spring connected with the electromagnet is arranged on the directional valve core;

a first oil way connected with the one-way valve is arranged in the electromagnetic directional valve; a first cavity is formed between the reversing valve sleeve and the control valve body, the first cavity is connected with the oil cavity through a first through hole, a second through hole and a third through hole which are both connected with the first cavity are arranged on the reversing valve sleeve, an annular groove with one end connected with the second through hole is arranged on the reversing valve core, the other end of the annular groove is connected with the first oil way, and the first through hole, the first cavity, the second through hole and the first annular groove form a second oil way; and a third oil duct is arranged in the reversing valve core, one end of the third oil duct is positioned at one side of the third through hole, and the other end of the third oil duct is connected with the inner cavity of the shell.

Compared with the prior art, the invention changes the constant delivery pump into a variable displacement pump on the basis of the existing auxiliary hydraulic system, and adds an electromagnetic directional valve, and switches the on-off of the oil cavity of the follow-up piston of the variable displacement pump and the high-pressure oil or the return oil at the outlet of the variable displacement pump through the electromagnetic directional valve. In an initial state, the follow-up piston cavity and outlet high-pressure oil are in a normally open state, so that the hydraulic pump is in a zero displacement state before the electric pump is started, the starting torque of the variable pump is greatly reduced, and after the variable pump is started, the follow-up piston is communicated with oil return to enable the variable pump to be in the maximum displacement, so that oil is continuously supplied to the main hydraulic system. Therefore, the invention has the advantages of reducing the starting torque of the electric pump, prolonging the service life of the auxiliary hydraulic system and improving the reliability of the auxiliary hydraulic system.

Drawings

Fig. 1 is a schematic diagram of the present invention.

Fig. 2 is a schematic structural diagram of the electromagnetic directional valve of the invention.

Fig. 3 is a partially enlarged view of fig. 2.

The labels in the figures are: 1-a motor, 2-a variable displacement pump, 3-a return piston, 4-a follower piston, 5-an electromagnetic directional valve, 6-a controller, 7-a throttle hole, 8-a pressure sensor, 9-a pressure accumulator, 10-a one-way valve, 11-a main hydraulic system, 12-a swash plate component, 13-a regulating screw plug, 14-a sealing screw plug, 15-a control valve body, 16-a directional valve sleeve, 17-a directional valve core, 18-a return spring, 19-an electromagnet, 20-a return spring, 21-a spring seat, 22-a shell, 23-an oil cavity, 24-a first oil circuit, 25-a first cavity, 26-a first through hole, 27-a second through hole, 28-an annular groove, 29-a third oil circuit and 30-a third through hole, 31-pipeline.

Detailed Description

The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.

Examples are given. Reduce controlling means of electric pump starting torque, as shown in fig. 1, including motor 1, the output of motor 1 is equipped with variable pump 2, variable pump 2 passes through check valve 10 and connects main hydraulic system 11, check valve 10 passes through pipeline 31 and connects main hydraulic system 11, be equipped with pressure sensor 8 on the pipeline 31, solenoid directional valve 5 and accumulator 9, pressure sensor 8 passes through controller 6 and connects motor 1, solenoid directional valve 5 passes through servo piston 4 and connects variable pump 2, solenoid directional valve 5 connects controller 6, be equipped with return piston 3 on the variable pump 2.

And an orifice 7 is arranged between the electromagnetic directional valve 5 and the one-way valve 10.

The variable displacement pump is characterized by further comprising a shell 22 for coating the swash plate assembly 12 of the variable displacement pump 2, wherein the shell 22 is a shell of the variable displacement pump 2, the servo piston 4 and the return piston 3 are respectively positioned on two sides of the swash plate assembly 12, an adjusting plug 13 connected with the shell 22 is arranged on the outer side of the servo piston 4, an oil cavity 23 is formed between the servo piston 4 and the adjusting plug 13, the return piston 3 is connected with a spring seat 21 through a return spring 20, and the spring seat 21 is fixed with the shell 22; one port of the electromagnetic directional valve 5 is connected with the oil chamber 23, and the other port of the electromagnetic directional valve 5 is connected with the inner chamber of the shell 22.

The electromagnetic reversing valve 5 is positioned on the outer side of the shell 22 and comprises a hollow control valve body 15, one end of the control valve body 15 is provided with a sealing plug 14, a reversing valve sleeve 16 is arranged in the control valve body 15, a reversing valve core 17 is arranged in the reversing valve sleeve 16, one side of the reversing valve core 17 is provided with an electromagnet 19, and the reversing valve core 17 is provided with a return spring 18 connected with the electromagnet 19;

a first oil path 24 connected with the one-way valve 10 is arranged in the electromagnetic directional valve 5, and the throttle hole 7 is formed on the first oil path 24; a first cavity 25 is formed between the reversing valve sleeve 16 and the control valve body 15, the first cavity 25 is connected with the oil cavity 23 through a first through hole 26, a second through hole 27 and a third through hole 30 which are both connected with the first cavity 25 are arranged on the reversing valve sleeve 16, an annular groove 28 with one end connected with the second through hole 27 is arranged on the reversing valve core 17, the other end of the annular groove 28 is connected with the first oil way 24, and the first through hole 26, the first cavity 25, the second through hole 27 and the first annular groove 28 form a second oil way; a third oil duct 29 is arranged in the direction changing valve core 17, one end of the third oil duct 29 is located at one side of the third through hole 30, and the other end of the third oil duct 29 is connected with the inner cavity of the housing 22.

The working principle is as follows: the controller 6 collects the pressure of the hydraulic system through the pressure sensor 8, when the pressure of the main hydraulic system 11 is reduced to a set pressure, the pressure sensor 8 generates a signal, the controller 6 controls the starting of the motor 1, or when the helicopter retracts or retracts the blade and the tail rotor, the controller 6 controls the starting of the motor 1, and the auxiliary hydraulic system is started. The motor 1 makes the variable displacement pump 2 supply oil to the main hydraulic system 11 and press the accumulator 9, when the pressure of the main hydraulic system 11 is increased to the set pressure, the controller 6 stops the motor 1, the accumulator 9 continues to output flow, the output pressure is maintained, when the pressure is reduced again, the motor 1 is started again, and the circulation is continued. Wherein the check valve 10 primarily shuts off the connection of the variable displacement pump 2 to the hydraulic system when the variable displacement pump 2 is not operating to reduce the likelihood of system leakage.

As shown in fig. 2, when the auxiliary hydraulic system is not started, the controller 6 makes the electromagnetic directional valve 5 not powered, the electromagnetic directional valve 5 works at the right position under the action of the right end return spring 18, the oil outlet of the variable displacement pump 2 is communicated with the left side of the follower piston 4 through the orifice 7, the first oil path 24 and the second oil path in sequence, due to the pressure of the accumulator 9 and the main hydraulic system, the follower piston 4 pushes the swash plate assembly 12 to swing to the zero swing angle position against the acting force of the return spring 20 under the action of high-pressure oil, and the variable displacement pump 2 is in the zero displacement state. The orifice 7 is now provided to reduce leakage of oil within the control mechanism.

When the auxiliary hydraulic system is started, the controller 6 starts the motor 1 and the electromagnetic directional valve 5 at the same time, the electromagnetic directional valve 5 is powered on, the electromagnet 19 pushes the directional valve core 17 to enable the electromagnetic directional valve 5 to work at the left position, the directional valve core moves to the left, the annular groove 28 is disconnected with the first oil path 24, and the third oil path 29 is communicated with the third through hole 30 on the directional valve sleeve 16. At this time, the first through hole 26 communicates with the third through hole 30, the third oil passage 29, and the case chamber, so that the pressures on both sides of the follower piston 4 are the same. The return piston 3 pushes the swash plate assembly 12 to swing to a large swing angle under the action of the return spring 20. Because the reaction time of the auxiliary hydraulic system is longer than the electric control time, the swash plate of the variable displacement pump 2 is still at the minimum swing angle when the motor 1 is started, and the starting torque of the motor 1 is as follows: t is equal to T pump + T additional torque, wherein the T pump is torque required by the normal work of the hydraulic pump, the value of the T pump is equal to delta PV/2 pi, delta P is the pressure difference of the inlet and the outlet of the variable pump, and V is the displacement of the variable pump; the T additional torque is the sum of the friction torque and the damping torque which need to be overcome when the variable pump is started. The smaller the initial swing angle of the variable displacement pump is, the smaller the starting torque of the motor 1 is, and the lower the starting current thereof is.

The invention has the advantages of reducing the starting torque of the electric pump, prolonging the service life of the auxiliary hydraulic system and improving the reliability of the auxiliary hydraulic system.