A miniature linear motor EGR valve

Abstract

The utility model discloses a kind of miniature linear motor EGR valve, including driving mechanism, valve body, output shaft, valve seat and valve piece, upper cavity and lower cavity are provided in valve body interior, driving mechanism is installed in upper cavity interior;The lower cavity is the gas cavity of intercommunication air inlet and air outlet, valve seat is arranged above the air inlet of gas cavity, valve piece is slidably equipped from the air inlet of lower cavity and valve seat;The valve piece is connected with the output shaft arranged through upper cavity and lower cavity, and the output shaft is connected with driving mechanism;Power failure reset mechanism that is driven valve piece to move up and close valve under power failure state is further installed in upper cavity;The utility model is installed power failure reset mechanism in valve body interior, solve the problem that valve piece cannot be controlled to close after motor power failure, realize the automatic reset of valve piece when driving mechanism power failure, and then close valve, avoid the influence on engine performance that valve is in normal open mode during power failure process.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely relates to a kind of micro linear motor EGR valves. BACKGROUND

[0002] Exhaust gas recirculation valve (EGR) valve is the execution element of EGR system, EGR valve is mainly assembled between engine exhaust system and intake system, its function is to control a certain amount of exhaust gas to enter combustion chamber again through its pipeline to participate in combustion, to realize the emission of harmful substances such as nitrogen oxides, carbon dioxide reduction, while it can improve compression ratio to prevent knock, and it has certain contribution to fuel economy.

[0003] Chinese invention patent CN107429605A discloses a bypass valve actuator and bypass valve driving device, including direct current motor, direct current motor includes shaft, screw mechanism, position sensor, control device, stop part.The invention patent transmits the torque of direct current motor to WG valve via screw mechanism, can use the friction generated by screw mechanism for the position maintenance of shaft to reduce the current of direct current motor, in addition, the lead angle of screw mechanism is set as the angle corresponding to the current of direct current motor required for maintaining the position of shaft, so that the current flowing to direct current motor can be adjusted when designing WG actuator, compared with the WG actuator using lead angle larger, the current of direct current motor required for maintaining the position of shaft can be reduced in the WG actuator using lead angle smaller;But this structure does not design the valve piece automatic closing mechanism under the power-off mode of direct current motor, cannot control turbine in power-off state, will have influence on engine fuel consumption, combustion efficiency and performance, and even can cause engine failure. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a kind of micro linear motor EGR valve, can keep valve automatic closing under power-off state, avoid the influence on engine performance in power-off process that valve is in normal open mode.

[0005] To solve the above technical problems, the technical scheme adopted by the utility model is as follows.

[0006] A kind of micro linear motor EGR valve, including driving mechanism, valve body, output shaft, valve seat and valve piece, valve body interior is provided with upper cavity and lower cavity, driving mechanism is installed in the interior of upper cavity;The lower cavity is the gas cavity of intercommunication inlet and outlet, valve seat is arranged above the gas cavity inlet, valve piece is slidably fitted from the inlet of lower cavity with valve seat;The valve piece is connected with the output shaft arranged through the upper cavity and the lower cavity, and the output shaft is connected with the driving mechanism;The upper cavity is also installed with power-off reset mechanism that drives valve piece to move up and closes valve under power-off state.

[0007] The micro linear motor EGR valve has the drive mechanism, the micro linear motor, the nut mechanism, the motor end cover, the circuit board, the magnetic steel assembly, the position sensor, the output shaft, the sealing structure, the first spring seat, the output shaft descending limiting part, the valve piece ascending limiting part and the sealing ring.

[0008] The micro linear motor EGR valve has the drive mechanism, the micro linear motor, the nut mechanism, the motor end cover, the circuit board, the magnetic steel assembly, the position sensor, the output shaft, the sealing structure, the first spring seat, the output shaft descending limiting part, the valve piece ascending limiting part and the sealing ring.

[0009] The micro linear motor EGR valve has the drive mechanism, the micro linear motor, the nut mechanism, the motor end cover, the circuit board, the magnetic steel assembly, the position sensor, the output shaft, the sealing structure, the first spring seat, the output shaft descending limiting part, the valve piece ascending limiting part and the sealing ring.

[0010] The micro linear motor EGR valve has the drive mechanism, the micro linear motor, the nut mechanism, the motor end cover, the circuit board, the magnetic steel assembly, the position sensor, the output shaft, the sealing structure, the first spring seat, the output shaft descending limiting part, the valve piece ascending limiting part and the sealing ring.

[0011] The micro linear motor EGR valve has the drive mechanism, the micro linear motor, the nut mechanism, the motor end cover, the circuit board, the magnetic steel assembly, the position sensor, the output shaft, the sealing structure, the first spring seat, the output shaft descending limiting part, the valve piece ascending limiting part and the sealing ring.

[0012] The micro linear motor EGR valve has the drive mechanism, the micro linear motor, the nut mechanism, the motor end cover, the circuit board, the magnetic steel assembly, the position sensor, the output shaft, the sealing structure, the first spring seat, the output shaft descending limiting part, the valve piece ascending limiting part and the sealing ring.

[0013] The micro linear motor EGR valve has the drive mechanism, the micro linear motor, the nut mechanism, the motor end cover, the circuit board, the magnetic steel assembly, the position sensor, the output shaft, the sealing structure, the first spring seat, the output shaft descending limiting part, the valve piece ascending limiting part and the sealing ring.

[0014] The micro linear motor EGR valve has the drive mechanism, the micro linear motor, the nut mechanism, the motor end cover, the circuit board, the magnetic steel assembly, the position sensor, the output shaft, the sealing structure, the first spring seat, the output shaft descending limiting part, the valve piece ascending limiting part and the sealing ring.

[0015] Thanks to the above technical scheme, the technical progress achieved by the utility model is as follows.

[0016] The utility model provides a micro linear motor EGR valve, through install power failure reset mechanism in the valve body, solved the problem that the valve piece cannot be closed after the motor power failure, realized the automatic reset of the valve piece when the drive mechanism power failure, further closes the valve, avoids the valve in the power failure process in the normal open mode influence engine performance. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is the specific structure schematic diagram of the utility model.

[0018] Fig. 2 This is a cross-sectional view of the magnet assembly described in this utility model from another angle;

[0019] Fig. 3 This is a schematic diagram of the specific structure of the output shaft described in this utility model.

[0020] The components are: 1. Drive mechanism, 2. Valve body, 2a. Upper cavity, 2b. Lower cavity, 2c. Output shaft downward movement limiting part, 3. Output shaft, 3a. Lead screw part, 3b. Guide stop part, 3c. Spring seat fixing part, 3d. Sealing part, 3e. Valve plate connecting part, 4. Position sensor, 5. PCBA circuit board, 6. Magnet assembly, 6a. Magnet, 6b. Magnet connecting column, 7. Valve seat, 7a. Valve plate upward movement limiting part, 8. Valve plate, 9. Valve plate return spring, 10. First spring seat, 11. Output shaft rotation stop part, 12. Nut mechanism, 13. Miniature linear motor, 14. Sealing assembly, 15. Magnet return spring, 16. Sealing ring, 17. Second spring seat. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] A miniature linear motor EGR valve, such as Figs. 1-3 As shown, the device includes a drive mechanism 1, a valve body 2, an output shaft 3, a valve seat 7, and a valve plate 8. The valve body 2 has an upper cavity 2a and a lower cavity 2b. The drive mechanism 1 is installed inside the upper cavity 2a. The lower cavity 2b is a gas passage connecting the air inlet and the air outlet. The valve seat 7 is located above the air inlet of the gas passage. The valve plate 8 is slidably fitted to the valve seat from the air inlet of the lower cavity 2b. The valve plate 8 is connected to the output shaft 3, which runs through the upper cavity 2a and the lower cavity 2b. The output shaft 3 is connected to the drive mechanism 1. Driven by the drive mechanism 1, the output shaft 3 moves the valve plate 8 up and down, facilitating the opening and closing of the valve.

[0023] A sealing structure 14 is provided between the upper cavity 2a and the lower cavity 2b to prevent exhaust gas impurities from entering the upper cavity during the movement of the output shaft. The sealing structure 14 uses existing technologies to achieve the sealing function, such as packing seal, elastic seal, bellows seal, etc., to achieve the sealing effect.

[0024] A sealing ring 16 is provided between the drive mechanism 1 and the valve body 2 to ensure the sealing between the drive mechanism and the valve body.

[0025] The upper cavity 2a is also equipped with a power failure reset mechanism that moves the valve plate 8 upward to close the valve in the event of power failure.

[0026] The power-off reset mechanism comprises a first spring seat 10 mounted on the output shaft 3, and the first spring seat 10 is connected with the bottom of the upper cavity 2a through the valve plate return spring 9.

[0027] When the driving mechanism 1 loses power, the valve plate return spring 9 arranged between the driving mechanism 1 and the valve body 2 drives the output shaft 3 and the valve plate 8 to move to the valve plate closing direction under the action of the spring force of the valve plate return spring 9, and in the embodiment, from the Fig. 1 It can be seen that the valve plate 8 moves upward, that is, the closing direction of the valve plate 8, which ensures that the valve plate 8 corresponding to the air inlet is closed in the power-off state of the EGR valve, so as to avoid the decline of engine performance, the exceeding of emission standards, and even the damage of the engine.

[0028] The driving mechanism 1 comprises a driving mechanism shell and a micro linear motor 13 mounted in the driving mechanism shell, and a nut mechanism 12 is arranged at the center of the rotor of the micro linear motor 13.

[0029] The output shaft 3 comprises a screw rod part 3a, a guide stop part 3b, a spring seat fixing part 3c, a sealing part 3d and a valve plate connecting part 3e arranged in sequence from top to bottom, the screw rod part 3a is threadedly connected with the nut mechanism 12, and the screw rod part 3a can transmit the rotary motion of the rotor of the micro linear motor 13 to the output shaft 3 and convert the rotary motion into the linear motion of the output shaft 3.

[0030] When the output shaft 3 moves downward, the first spring seat 10 fixed on the output shaft 3 moves together with the output shaft 3, pushes the first spring seat 10 to compress the valve plate return spring 9, and then drives the valve plate 8 to move downward to open the valve, and at the same time, the guide stop part 3b can guide the output shaft 3 in cooperation with the output shaft rotation stop part 11 fixed at the end of the driving mechanism, so as to control the linear motion track of the output shaft 3.

[0031] When the screw rod part 3a at the upper part of the output shaft 3 moves to contact the output shaft rotation stop part 11, it indicates that the output shaft moves to the limit position.

[0032] The spring seat fixing part 3c is used for mounting the first spring seat 10, so that the power-off reset mechanism moves together with the output shaft to realize the automatic reset of the valve plate in the power-off state by cooperating with the movement of the output shaft.

[0033] The sealing part 3d is sleeved in the sealing assembly 14 and is sealingly connected with the sealing assembly 14, which can prevent gas from entering the inside of the upper cavity 2a and corrode the electronic components of the micro linear motor 13.

[0034] The valve plate connecting part 3e is the lower end of the output shaft 3 and is used for connecting the valve plate 8, and through the cooperation of the valve plate 8 and the valve seat 7, the opening and closing of the EGR valve are realized.

[0035] The upper end of the output shaft 3 is provided with a magnetic steel assembly 6, which comprises a magnetic steel connecting column 6b connected with the output shaft, and the top end of the magnetic steel connecting column 6b is provided with a magnetic steel 6a.

[0036] A position sensor 4 is arranged on the driving mechanism shell corresponding to the magnetic steel assembly 6, which can be a Hall element or a magnetoresistance element. During the reciprocating movement of the magnetic steel assembly 6 along with the output shaft, the position sensor 4 detects the change of the magnetic flux density of the magnetic steel assembly and converts it into an electric signal.

[0037] The output end of the position sensor 4 is connected with the input end of the PCBA circuit board 5, which is arranged on the motor end cover of the micro linear motor 13. The electric signal of the position sensor 4 is output to the control system through the PCBA circuit board 5.

[0038] The output end of the micro linear motor 13 is connected with the input end of the PCBA circuit board 5, and the signal is converted and output to the control system through the PCBA circuit board 5.

[0039] The two sides of the magnetic steel 6a are respectively provided with magnetic steel return springs 15, which are used to keep the magnetic steel assembly 6 closely combined with one end of the output shaft 3 during the movement of the magnetic steel assembly 6 in the opening direction of the valve, so as to ensure accurate reading of the displacement information of the output shaft. The top end of the driving mechanism shell and the top end of the magnetic steel assembly 6 are respectively provided with second spring seats 17, and the magnetic steel return springs 15 are installed between the two second spring seats 17 arranged correspondingly.

[0040] The inside of the valve body 2 is provided with an output shaft downward limiting part 2c, which can limit the bottom end of the first spring seat 10 during the downward movement of the output shaft.

[0041] The valve seat 7 is provided with a valve piece upward limiting part 7a, which can limit the valve piece 8, so as to avoid the continuous action of the valve piece and the continuous movement of the output shaft.

[0042] When the EGR valve performs the opening operation, under the driving force of the micro linear motor 13, the driving screw rod part 3a moves downward, and during the downward movement, the output shaft 3 drives the first spring seat 10 fixed on the output shaft 3 to act together, pushes the first spring seat 10 to compress the valve plate return spring 9, so that the output shaft needs to overcome the action force of the valve plate return spring force 9 and the gas pressure to move downward, so that the valve plate 8 moves away from the valve seat 7 in the downward direction, and the magnetic steel assembly 6 arranged at the other end of the output shaft 3 moves downward along with the output shaft 3 under the action force of the magnetic steel return spring 15, at this time, the magnetic flux density of the position sensor 4 changes, since the position sensor 4 selects a Hall element or a magnetoresistance element, the changing magnetic flux density of the magnetic steel assembly 6 during the movement of the output shaft 3 is detected, and is converted into an electrical signal representing the actual stroke position of the opening degree of the valve plate 8 and is output to the PCBA circuit board 5, and is transmitted to the control system through the PCBA circuit board 5.

[0043] When the EGR valve performs the closing operation, the driving screw rod part 3a of the micro linear motor 13 moves upward, under the driving force of the linear motor 13 and the action force of the spring 9, the output shaft 3 drives the valve plate 8 to gradually move in the direction of approaching the valve seat 7, and the magnetic steel assembly 6 arranged at the other end of the output shaft 3 moves along with the output shaft under the action force of the magnetic steel return spring 15, at this time, the magnetic flux density of the position sensor 4 changes, the position sensor 4 detects the changing magnetic flux density of the magnetic steel assembly 6 during the movement of the output shaft 3, and converts it into an electrical signal representing the actual stroke position of the opening degree of the valve plate 8 and outputs it to the PCBA circuit board 5, and transmits it to the control system through the PCBA circuit board 5.

[0044] The utility model provides a kind of micro linear motor EGR valve, by installing power loss reset mechanism inside valve body, solve the problem that valve plate cannot be closed after motor power loss, realize the automatic reset of valve plate when driving mechanism power loss, and then close valve, avoid the influence on engine performance that valve is in normal open mode during power loss.

Claims

1. A miniature linear motor EGR valve, characterized in that: The device includes a drive mechanism (1), a valve body (2), an output shaft (3), a valve seat (7), and a valve plate (8). The valve body (2) has an upper cavity (2a) and a lower cavity (2b) inside. The drive mechanism (1) is installed inside the upper cavity (2a). The lower cavity (2b) is a gas passage connecting the inlet and outlet. The valve seat (7) is located above the inlet of the gas passage. The valve plate (8) is slidably fitted with the valve seat (7) from the inlet of the lower cavity (2b). The valve plate (8) is connected to the output shaft (3) that runs through the upper cavity (2a) and the lower cavity (2b). The output shaft (3) is connected to the drive mechanism (1). The upper cavity (2a) is also equipped with a power failure reset mechanism that drives the valve plate (8) to move upward and close the valve when the power is lost.

2. The miniature linear motor EGR valve according to claim 1, characterized in that: The drive mechanism (1) includes a drive mechanism housing and a micro linear motor (13) installed in the drive mechanism housing. A nut mechanism (12) is provided at the center of the rotor of the micro linear motor (13), and the top of the output shaft (3) is threadedly connected to the inside of the nut mechanism (12). A PCBA circuit board (5) is provided on the motor end cover of the micro linear motor (13).

3. The miniature linear motor EGR valve according to claim 2, characterized in that: The upper end of the output shaft (3) is provided with a magnet assembly (6), which includes a magnet connecting column (6b) connected to the output shaft, and a magnet (6a) is provided at the top of the magnet connecting column (6b); a position sensor (4) is provided on the drive mechanism housing corresponding to the magnet assembly (6), and the output end of the position sensor (4) is connected to the input end of the PCBA circuit board (5).

4. The miniature linear motor EGR valve according to claim 2, characterized in that: The output shaft (3) includes a lead screw part (3a), a guide stop part (3b), a spring seat fixing part (3c), a sealing part (3d), and a valve plate connecting part (3e) arranged sequentially from top to bottom. The lead screw part (3a) is threadedly connected to the nut mechanism (12).

5. A miniature linear motor EGR valve according to claim 4, characterized in that: A sealing assembly (14) is provided between the upper cavity (2a) and the lower cavity (2b), and the sealing part (3d) is fitted inside the sealing assembly (14) and is sealed to the sealing assembly (14).

6. A miniature linear motor EGR valve according to claim 4, characterized in that: The power failure reset mechanism includes a first spring seat (10) mounted on the spring seat fixing part (3c), and the first spring seat (10) is connected to the bottom of the upper cavity (2a) through a valve plate return spring (9).

7. A miniature linear motor EGR valve according to claim 6, characterized in that: The valve body (2) is provided with an output shaft downward movement limiting part (2c) that limits the bottom end of the first spring seat (10) during the downward movement of the output shaft.

8. A miniature linear motor EGR valve according to claim 1, characterized in that: The valve seat (7) is provided with a valve plate upward movement limiting part (7a) for limiting the upward movement of the valve plate (8).

9. A miniature linear motor EGR valve according to claim 1, characterized in that: A sealing ring (16) is provided between the drive mechanism (1) and the valve body (2) to provide a sealing function.

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