CN106917707B - Automobile oil tank change-over valve with time-delay oil return function and operation method - Google Patents

Abstract

The invention discloses an automobile oil tank change-over valve with a time-delay oil return function and an operation method, wherein a gear transmission mechanism for driving a first plane cam and a second plane cam is arranged in a shell, the first plane cam is sleeved outside a first oil duct shaft, the second plane cam is sleeved outside a second oil duct shaft, a total oil outlet is arranged on the first oil duct shaft outside a cover plate, and a total oil return port is arranged on the second oil duct shaft; the shell is provided with a first oil inlet channel and a second oil inlet channel; the shell is provided with a first oil return channel and a second oil return channel. The first plane cam is matched with a first ejector rod switching device and a second ejector rod switching device which are used for carrying out oil inlet communication switching on the two oil inlet channels; and the second plane cam is matched with a third ejector rod switching device and a fourth ejector rod switching device which are used for carrying out oil return communication switching on the two oil return channels.

Description

A kind of automobile fuel tank switching valve with delayed oil return function and operation method

technical field

The invention belongs to the field of automobile fuel tank parts, and in particular relates to an automobile fuel tank switching valve with a delayed fuel return function and an operation method thereof.

Background technique

At present, some diesel vehicles have a double fuel tank structure, and the numbers of the diesel fuels contained in the two fuel tanks are different. Usually, when the fuel in one fuel tank is used up, it needs to be automatically switched to another fuel tank for fuel supply. Therefore, usually There are two oil inlets connected to the two oil tanks at the bottom, and the two oil tanks are also provided with oil return ports respectively. channels are connected. Since there is no such automatic switching valve for the fuel tank at present, it needs to be switched manually during the operation. The switching efficiency is low, the stability is relatively poor, and the durability is relatively poor. Therefore, it is necessary to design a switching valve with to automatically switch between the two fuel tanks.

SUMMARY OF THE INVENTION

The invention provides an automobile fuel tank switching valve with a delayed fuel return function and an operation method thereof. The switching valve adopts an automatic control method and can automatically switch between two different marked fuel tanks of a diesel vehicle, thereby improving the performance of the vehicle. The switching efficiency is improved, and the switching valve has a simple structure and stable working process, which improves its durability and prolongs its service life.

In order to solve the above-mentioned technical problems, the present invention proposes the following technical scheme: an automobile fuel tank switching valve with a delayed oil return function, which includes a casing, and a driver for driving the first plane cam and the second plane cam is installed inside the casing. In the gear transmission mechanism, the first plane cam is sleeved on the outside of the first oil passage shaft, the first oil passage shaft is installed inside the casing, and the end face of the first plane cam is machined with a first cam groove.

The second plane cam is sleeved on the outside of the second oil passage shaft, the second oil passage shaft is installed inside the housing, and the end face of the second plane cam is machined with a second cam groove.

A cover plate is installed on the casing, the first oil passage shaft and the second oil passage shaft pass through the cover plate, the first oil passage shaft outside the cover plate is provided with a general oil outlet, and the second oil passage shaft is provided with a general oil outlet. A total oil return port is arranged on the oil passage shaft; No. 1 oil inlet passage and No. 2 oil inlet passage are arranged on the housing, and the No. 1 oil inlet passage and the No. 2 oil inlet passage cooperate with the general oil outlet for supplying Oil; the casing is provided with a No. 1 oil return channel and a No. 2 oil return channel, and the No. 1 oil return channel and the No. 2 oil return channel cooperate with the general oil return port for oil return.

The first plane cam is matched with the first ejector rod switching device and the second ejector rod switching device for switching the oil inlet communication in the two oil inlet passages; and the second plane cam is used for the two oil return channels. The third ejector rod switching device for switching the oil return communication is matched with the fourth ejector rod switching device.

The gear transmission mechanism includes a motor, the motor is installed in the motor cavity inside the housing, and a driving gear is installed on the output shaft of the motor, and the driving gear is connected to the outer edges of the first plane cam and the second plane cam. The driven gear also constitutes a gear meshing transmission.

The motor adopts a deceleration motor, and the deceleration motor is connected with a controller through a frequency converter, and the controller is connected with a servo control button through a signal line to control the automatic rotation of the motor and the phase angle of its rotation.

The structures of the first ejector rod switching device, the second ejector rod switching device, the third ejector rod switching device and the fourth ejector rod switching device are the same; The two ends are respectively supported on the first oil passage shaft and the positioning support holes on the housing, and form a sliding fit. The end of the ejector rod that is matched with the first plane cam is machined with a ball mounting hole, and the ball mounting hole is inlaid inside. A ball is installed, the ball and the first cam groove form a rolling fit, a valve core is positioned and installed on the ejector rod through the shaft shoulder, and a return spring is sleeved on the ejector rod between the valve core and the first oil passage plate , a matching sealing ring is installed on the valve core, and the matching sealing ring is matched with the end chamfer of the first oil passage and seals the first oil passage, and then seals the No. 2 oil inlet, so A plurality of first oil passage holes are uniformly processed on the first oil passage plate.

The second mandrel switching device cooperates with the second oil passage, the second oil passage plate and the second oil passage to switch the on-off of the No. 1 oil inlet; the third mandrel switching device and the No. The four ejector rod switching device also cooperates with the corresponding oil passage, oil passage plate and oil passage respectively to switch the on-off of the No. 1 oil return passage and the No. 2 oil return passage.

A first sealing ring is arranged between the cover plate and the first oil passage shaft; a second sealing ring is arranged between the matched end faces of the cover plate and the casing; A third sealing ring is arranged between the matched end faces.

A fourth sealing ring is provided at the position where the ejector rods of the first ejector rod switching device and the second ejector rod switching device are matched with the first oil passage shaft; the third ejector rod switching device and the fourth ejector rod switching device A fifth sealing ring is arranged at the position where the mandrel of the cylinder is matched with the second oil passage shaft.

The phase difference of the first cam groove on the end face of the first plane cam is 90 degrees, which ensures that when the first plane cam rotates by 90 degrees, the No. 1 oil inlet and the No. 2 oil inlet are respectively closed and open; the second The phase difference of the second cam groove on the end face of the plane cam is 90 degrees, which ensures that when the second plane cam rotates 90 degrees, the No. 1 oil return channel and the No. 2 oil return channel are respectively closed and open.

The lower end surfaces of the first plane cam and the second plane cam are both positioned by the positioning baffles and installed on the first oil passage shaft and the second oil passage shaft respectively, and the upper surfaces of the first plane cam and the second plane cam The end face is positioned by a positioning ring, the positioning ring is positioned and installed on the first oil passage shaft and the second oil passage shaft by a spring retaining ring, and the elastic retaining ring is installed on the shafts of the first oil passage shaft and the second oil passage shaft on the ring.

Using any one of the operation methods of the automobile fuel tank switching valve with delayed oil return function, it includes the following steps:

The first step is to connect the No. 1 oil inlet and No. 2 oil inlet of the conversion valve to the oil outlets of the first oil tank and the second oil tank through oil pipes respectively, and connect the total oil outlet to the oil supply pipeline; The No. 1 oil return channel and the No. 2 oil return channel are connected with the oil return ports of the first oil tank and the second oil tank through oil pipes, and the general oil return port is connected with the oil return pipeline;

In the second step, initially, the ejector rod of the second ejector rod switching device is located at the distal end of the first cam groove. At this time, the valve core of the second ejector rod switching device is lifted up under the action of the return spring, so that the second ejector rod is over-oiled. The channel is opened, so that the No. 1 oil inlet and the main oil outlet are connected, and oil is supplied to the oil supply pipeline;

In the third step, when the fuel in the first fuel tank is exhausted, press the servo control button to make the motor rotate, which in turn drives the first plane cam to rotate, and then rotates the phase angle of the first plane cam by 90 degrees. The phase angle of the groove is also shifted by 90 degrees, so that the second ejector switch device closes the second oil passage, and the first ejector switch opens the first oil passage, and then passes through the No. 2 oil inlet and the total oil outlet. It is connected to each other, and supplies oil to the oil supply pipeline to complete the switching of the oil supply of the two oil tanks; at this time, the valve core components of the ejector switching device of the No. 1 oil return channel and the No. 2 oil return channel remain unchanged;

The fourth step, under the control of the control circuit, the motor rotates again after a certain time delay, and then drives the second plane cam to rotate, thereby making the phase angle of the second plane cam rotate 90 degrees, at this time the phase angle of the second cam slot is It is also converted 90 degrees, so that the valve core assembly of the No. 1 oil return channel goes down to close the No. 1 oil return channel, while the valve core assembly of the No. 2 oil return channel moves upward under the action of the return spring, and then opens the No. 2 oil return channel to complete the first oil return channel. The oil return channel No. 2 and the oil return channel No. 2 are converted. At this time, the valve core components of the ejector switching device of the oil inlet channel No. 1 and the oil inlet channel No. 2 remain in the original state, and a fuel tank conversion is completed.

In the fifth step, when the fuel in the second fuel tank is exhausted, the above-mentioned operation process is cycled according to the same method, and finally the fuel circulation supply of the two fuel tanks is realized.

The present invention has the following beneficial effects:

1. The above-mentioned six-way switching valve can automatically switch between the two fuel tanks, thereby ensuring that after the fuel in one fuel tank is burnt out, it is automatically switched to the other fuel tank through the first plane cam, and finally ensures that the two fuel tanks are operated. Automatic switching ensures smooth oil supply, and the two oil tanks have oil return function, which can realize both oil intake and oil return.

2. The driving gear can be driven by the motor, the first plane cam can be driven by the driving gear, and the two ejector switching devices can be driven by the first cam groove on the first plane cam, and then the first oil-passing channel and the second oil-passing device can be driven. The channels are automatically switched, so that the No. 1 oil inlet channel and the No. 2 oil inlet channel are alternately connected to the total oil outlet, and the oil supply operation is performed in sequence.

3. The driving gear can be driven by the motor, the second plane cam can be driven by the driving gear, and the two ejector switching devices can be driven by the second cam groove on the second plane cam, and then the No. 1 oil return channel and the No. 2 oil return Automatically switch between the channels, so that the No. 1 oil return channel and the No. 2 oil return channel are alternately connected to the general oil outlet, and the oil return operation is carried out in turn.

4. Through the ejector rod switching device, during the working process, the ejector rod is matched with the first cam groove of the first plane cam to drive the ejector rod to move freely, which in turn drives the matching sealing ring on the valve core and the first oil pass. The circulation and sealing cooperation between the channel and the second oil-passing channel finally realizes the automatic communication between the No. 1 oil inlet channel, the No. 2 oil inlet channel and the total oil outlet, and realizes the automatic switching between different oil tanks.

5. The friction force between the ejector bar and the first cam groove can be reduced by the balls arranged at the end of the ejector bar, thereby playing a good role as a cam ejector bar.

6. The phase angle of the first plane cam differs by 90 degrees, which can ensure automatic switching between the two fuel tanks and realize the alternate supply of fuel between the two fuel tanks.

Description of drawings

The present invention will be further described below with reference to the accompanying drawings and embodiments.

FIG. 1 is a front cross-sectional view of the present invention.

Fig. 2 is a cross-sectional view taken along line A-A of Fig. 1 of the present invention.

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1 of the present invention.

FIG. 4 is a first perspective three-dimensional view of the switching valve of the present invention.

FIG. 5 is a three-dimensional view of the switching valve of the present invention from a second perspective.

In the figure: housing 1, motor 2, motor cavity 3, threaded hole 4, cover plate 5, driving gear 6, output shaft 7, first plane cam 8, first cam groove 9, total oil outlet 10, An oil passage shaft 11, a first sealing ring 12, a spring retaining ring 13, a positioning ring 14, a positioning diaphragm 15, a second sealing ring 16, a third sealing ring 17, No. 1 oil inlet 18, No. 2 oil inlet 19. Second ejector switching device 20, second oil passage 21, second oil passage 22, second oil passage plate 23, first oil passage plate 24, first oil passage hole 25, first oil passage 26. Return spring 27, matching sealing ring 28, valve core 29, ejector rod 30, fourth sealing ring 31, ball mounting hole 32, ball 33, total oil return port 34, third ejector rod switching device 35, fourth ejector The lever switching device 36 , the No. 1 oil return passage 37 , the No. 2 oil return passage 38 , the second plane cam 39 , the second cam groove 40 , the second oil passage shaft 41 , and the fifth sealing ring 42 .

Detailed ways

The embodiments of the present invention will be further described below with reference to the accompanying drawings.

Example 1:

As shown in Figures 1-5, an automobile fuel tank switching valve with delayed oil return function includes a housing 1, and a gear that drives the first plane cam 8 and the second plane cam 39 is installed inside the casing 1 Transmission mechanism, the first plane cam 8 is sleeved on the outside of the first oil passage shaft 11, the first oil passage shaft 11 is installed inside the casing 1, and the end face of the first plane cam 8 is processed with a first cam slot 9. The second plane cam 39 is sleeved on the outside of the second oil passage shaft 41, the second oil passage shaft 41 is installed inside the housing 1, and the end face of the second plane cam 39 is machined with a second cam groove 40;

A cover plate 5 is installed on the housing 1 , the first oil passage shaft 11 and the second oil passage shaft 41 pass through the cover plate 5 , and the first oil passage shaft 11 outside the cover plate 5 is provided with a The total oil outlet 10 and the second oil passage shaft 41 are provided with a total oil return port 34; the housing 1 is provided with a No. 1 oil inlet 18 and a No. 2 oil inlet 19, and the No. 1 oil inlet 18 and The No. 2 oil inlet 19 cooperates with the general oil outlet 10 for oil supply; the housing 1 is provided with a No. 1 oil return 37 and a No. 2 oil return 38, and the No. 1 oil return 37 and the No. 2 return The oil passage 38 cooperates with the total oil return port 34 to return oil;

The first plane cam 8 cooperates with the first jack switching device and the second jack switching device 20 for switching the oil inlet communication between the two oil inlet passages; and the second plane cam 39 is used for the two The third ejector rod switching device 35 and the fourth ejector rod switching device 36 cooperate with each oil return channel to switch the oil return communication. During the working process, the above structure can drive the two ejector rod switching devices under the action of the first plane cam 8, and then automatically switch between the two oil inlet passages through the action of the two ejector rod switching devices.

Further, the gear transmission mechanism includes a motor 2, the motor 2 is installed in the motor cavity 3 inside the housing 1, and a driving gear 6 is installed on the output shaft 7 of the motor 2, and the driving gear 6 and The driven gears on the outer edges of the first plane cam 8 and the second plane cam 39 simultaneously form a gear meshing transmission. During the working process, the motor 2 drives the output shaft 7, drives the driving gear 6 through the output shaft 7, drives the first plane cam 8 through the driving gear 6, and then drives the ejector rod switching device through the first plane cam 8 to realize two oil passages. automatic switching between.

Further, the motor 2 adopts a deceleration motor, and the deceleration motor is connected to a controller through a frequency converter, and the controller is connected to a servo control button through a signal line to control the automatic rotation of the motor 2 and the phase angle of its rotation. During the working process, the deceleration motor is controlled by the action of the controller and the frequency converter, and then the driving gear 6 is driven by the deceleration motor to rotate a certain number of turns, thereby making the first plane cam 8 and the second plane cam 39 rotate a certain phase angle, and Works in conjunction with two ejector switches.

Further, the structures of the first ejector switching device, the second ejector switching device 20, the third ejector switching device 35 and the fourth ejector switching device 36 are the same; the first ejector switching device includes a ejector 30. The two ends of the ejector rod 30 are respectively supported on the first oil passage shaft 11 and the positioning support holes on the housing 1, and form a sliding fit, and the end of the ejector rod 30 that is matched with the first plane cam 8 is processed There is a ball mounting hole 32, a ball 33 is embedded in the ball mounting hole 32, the ball 33 forms a rolling fit with the first cam groove 9, and the valve core 29 is positioned and installed on the ejector rod 30 through the shaft shoulder, so A return spring 27 is sleeved on the ejector rod 30 between the valve core 29 and the first oil passage plate 24 , and a matching sealing ring 28 is installed on the valve core 29 , and the matching sealing ring 28 is connected to the first oil passage 26 . The end chamfers of the oil passages 24 are matched with each other and seal the first oil passage 26, thereby sealing and blocking the No. 2 oil inlet passage 19. The first oil passage plate 24 is uniformly machined with a plurality of first oil passages 25. During the working process, through the cooperation of the first plane cam 8 with the ejector rods 30 of the first ejector rod switching device and the second ejector rod switching device 20, the valve core can communicate with the first oil passage 26 and the second oil passage 21 through the valve core. The cooperation between them finally realizes the automatic switching between the two fuel tanks.

Further, the second ejector rod switching device 20 cooperates with the second oil passage 21, the second oil passage plate 23 and the second oil passage hole 22 to switch the on-off of the No. 1 oil inlet passage 18; the The third mandrel switching device 35 and the fourth mandrel switching device 36 also cooperate with the corresponding oil passages, oil passage plates and oil passages to connect and disconnect the No. 1 oil return passage 37 and the No. 2 oil return passage 38 respectively. to switch.

Further, a first sealing ring 12 is arranged between the cover plate 5 and the first oil passage shaft 11 ; a second sealing ring 16 is arranged between the matched end surfaces of the cover plate 5 and the housing 1 ; the A third sealing ring 17 is provided between the matched end faces of the first oil passage shaft 11 and the casing 1 . During the working process, the above-mentioned multiple sealing rings can ensure the sealing between the above-mentioned various components.

Further, a fourth sealing ring 31 is provided at the position where the ejector rods of the first ejector rod switching device and the second ejector rod switching device 20 are matched with the first oil passage shaft 11 ; the third ejector rod switching device 35 A fifth sealing ring 42 is provided at the position where the ejector rod of the fourth ejector rod switching device 36 is matched with the second oil passage shaft 41 .

Further, the phase difference of the first cam groove 9 on the end face of the first plane cam 8 is 90 degrees, which ensures that when the first plane cam 8 rotates by 90 degrees, the No. 1 oil inlet 18 and the No. 2 oil inlet 19 are respectively closed. and the open state; the phase difference of the second cam groove 40 on the end face of the second plane cam 39 is 90 degrees, to ensure that when the second plane cam 39 rotates 90 degrees, the No. 1 oil return channel 37 and the No. 2 oil return channel 38 are respectively in off and on state.

Further, the lower end surfaces of the first plane cam 8 and the second plane cam 39 are positioned by the positioning baffle 15 and are respectively mounted on the first oil passage shaft 11 and the second oil passage shaft 41, the first plane The upper end surfaces of the cam 8 and the second plane cam 39 are positioned by the positioning ring 14, and the positioning ring 14 is positioned and installed on the first oil passage shaft 11 and the second oil passage shaft 41 by the elastic retaining ring 13. The elastic retaining ring 13 is mounted on the collars of the first oil passage shaft 11 and the second oil passage shaft 41 .

Example 2:

Further, the phase difference of the first cam groove 9 on the end face of the first plane cam 8 is 180 degrees, which ensures that when the first plane cam 8 rotates 180 degrees, the No. 1 oil inlet 18 and the No. 2 oil inlet 19 are respectively closed. and the open state; the phase difference of the second cam groove 40 on the end face of the second plane cam 39 is 180 degrees, to ensure that when the second plane cam 39 rotates 180 degrees, the No. 1 oil return channel 37 and the No. 2 oil return channel 38 are respectively in off and on state.

Example 3:

Using any one of the operation methods of the automobile fuel tank switching valve with delayed oil return function, it includes the following steps:

The first step is to connect the No. 1 oil inlet 18 and No. 2 oil inlet 19 of the switching valve to the oil outlets of the first oil tank and the second oil tank through oil pipes respectively, and connect the total oil outlet 10 to the oil supply pipeline. Connect the No. 1 oil return passage 37 and the No. 2 oil return passage 38 with the oil return ports of the first oil tank and the second oil tank through oil pipes, and connect the total oil return port 34 with the oil return pipeline;

In the second step, initially the ejector rod of the second ejector rod switching device 20 is located at the distal end of the first cam groove 9, and at this time, the valve core of the second ejector rod switching device 20 is pushed up under the action of the return spring, so that the The second oil passage 21 is opened, so that the No. 1 oil inlet passage 18 is communicated with the total oil outlet 10, and supplies oil to the oil supply pipeline;

In the third step, when the fuel in the first fuel tank is exhausted, press the servo control button to make the motor 2 rotate, which in turn drives the first plane cam 8 to rotate, and then rotates the phase angle of the first plane cam 8 by 90 degrees. The phase angle of the first cam groove 9 is also shifted by 90 degrees, so that the second ejector rod switching device 20 closes the second oil passage 21, and the first ejector rod switching device opens the first oil passage 26. The oil passage 19 is connected to the main oil outlet 10, and supplies oil to the oil supply pipeline to complete the switching of the oil supply of the two oil tanks; at this time, the ejector rod switching device of the No. 1 oil return passage 37 and the No. 2 oil return passage 38 The valve core assembly remains in its original state;

In the fourth step, under the control of the control circuit, the motor 2 rotates again after a certain time delay, thereby driving the second plane cam 39 to rotate, thereby making the phase angle of the second plane cam 39 rotate 90 degrees. The phase angle of 40 is also shifted by 90 degrees, so that the spool assembly of the No. 1 oil return passage 37 goes down to close the No. 1 oil return passage 37, while the spool assembly of the No. 2 oil return passage 38 moves upward under the action of the return spring, thereby opening the second oil return passage 38. No. 1 oil return channel 38, the conversion of No. 1 oil return channel 37 and No. 2 oil return channel 38 is completed. At this time, the valve core components of the ejector rod switching device of No. 1 oil inlet channel 18 and No. 2 oil inlet channel 19 are maintained. The original state remains unchanged, and a fuel tank conversion has been completed so far;

In the fifth step, when the fuel in the second fuel tank is exhausted, the above-mentioned operation process is cycled according to the same method, and finally the fuel circulation supply of the two fuel tanks is realized.

Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical idea of the present invention, all within the protection scope of the present invention. Matters not covered in the present invention belong to the common knowledge of those skilled in the art.

Claims (8)

1. The utility model provides a take car oil tank change-over valve of time delay oil return function which characterized in that: the oil-gas separation device comprises a shell (1), wherein a gear transmission mechanism for driving a first plane cam (8) and a second plane cam (39) is installed in the shell (1), the first plane cam (8) is sleeved outside a first oil channel shaft (11), the first oil channel shaft (11) is installed in the shell (1), and a first cam groove (9) is machined in the end face of the first plane cam (8);

the second plane cam (39) is sleeved outside the second oil channel shaft (41), the second oil channel shaft (41) is installed inside the shell (1), and a second cam groove (40) is machined in the end face of the second plane cam (39);

a cover plate (5) is mounted on the shell (1), the first oil channel shaft (11) and the second oil channel shaft (41) penetrate through the cover plate (5), a total oil outlet (10) is formed in the first oil channel shaft (11) outside the cover plate (5), and a total oil return opening (34) is formed in the second oil channel shaft (41); a first oil inlet channel (18) and a second oil inlet channel (19) are arranged on the shell (1), and the first oil inlet channel (18) and the second oil inlet channel (19) are matched with the main oil outlet (10) for oil supply; a first oil return channel (37) and a second oil return channel (38) are arranged on the shell (1), and the first oil return channel (37) and the second oil return channel (38) are matched with the main oil return port (34) for oil return;

the first plane cam (8) is matched with a first ejector rod switching device and a second ejector rod switching device (20) which are used for carrying out oil inlet communication switching on the two oil inlet channels; and the second plane cam (39) is matched with a third mandril switching device (35) and a fourth mandril switching device (36) which are used for carrying out oil return communication switching on two oil return channels;

the gear transmission mechanism comprises a motor (2), the motor (2) is installed inside a motor cavity (3) inside the shell (1), a driving gear (6) is installed on an output shaft (7) of the motor (2), and the driving gear (6) and driven gears on the outer edges of the first plane cam (8) and the second plane cam (39) form gear meshing transmission at the same time;

the first ejector rod switching device, the second ejector rod switching device (20), the third ejector rod switching device (35) and the fourth ejector rod switching device (36) are identical in structure; the first ejector rod switching device comprises an ejector rod (30), two ends of the ejector rod (30) are respectively supported on a first oil channel shaft (11) and a positioning support hole in the shell (1) and form sliding fit, a ball mounting hole (32) is machined in one end, matched with the first plane cam (8), of the ejector rod (30), a ball (33) is mounted in the ball mounting hole (32) in an embedded mode, the ball (33) and the first cam groove (9) form rolling fit, a valve core (29) is mounted on the ejector rod (30) through shaft shoulders in a positioning mode, a reset spring (27) is sleeved on the ejector rod (30) between the valve core (29) and the first oil channel plate (24), a matching sealing ring (28) is mounted on the valve core (29), and the matching sealing ring (28) is matched with a tail end chamfer of the first oil channel (26) and seals the first oil channel (26), and then the second oil inlet channel (19) is sealed and blocked, and a plurality of first oil passing holes (25) are uniformly distributed and processed on the first oil channel plate (24).

2. The automotive oil tank switching valve with the time-delay oil return function according to claim 1, wherein: the motor (2) adopts a reducing motor, the reducing motor is connected with a controller through a frequency converter, and the controller is connected with a servo control button through a signal line to control the automatic rotation of the motor (2) and the rotating phase angle of the motor.

3. The automotive oil tank switching valve with the time-delay oil return function according to claim 1, wherein: the second ejector rod switching device (20) is matched with the second oil passing channel (21), the second oil passage plate (23) and the second oil passing hole (22) to switch the connection and disconnection of the first oil inlet passage (18); and the third ejector rod switching device (35) and the fourth ejector rod switching device (36) are respectively matched with the corresponding oil passing channel, the oil channel plate and the oil passing hole to switch the connection and disconnection of the first oil return channel (37) and the second oil return channel (38).

4. The automotive oil tank switching valve with the time-delay oil return function according to claim 1, wherein: a first sealing ring (12) is arranged between the cover plate (5) and the first oil channel shaft (11); a second sealing ring (16) is arranged between the end faces of the cover plate (5) and the shell (1) which are matched; and a third sealing ring (17) is arranged between the end surfaces of the first oil channel shaft (11) and the shell (1) which are matched.

5. The automotive oil tank switching valve with the time-delay oil return function according to claim 1, wherein: a fourth sealing ring (31) is arranged at the position where the ejector rods of the first ejector rod switching device and the second ejector rod switching device (20) are matched with the first oil channel shaft (11); and fifth sealing rings (42) are arranged at the positions where the push rods of the third push rod switching device (35) and the fourth push rod switching device (36) are matched with the second oil channel shaft (41).

6. The automotive oil tank switching valve with the time-delay oil return function according to claim 1, wherein: the phase difference of the first cam groove (9) on the end face of the first planar cam (8) is 90 degrees, so that the first oil inlet channel (18) and the second oil inlet channel (19) are respectively in a closed state and an open state when the first planar cam (8) rotates for 90 degrees; the phase difference of a second cam groove (40) on the end face of the second planar cam (39) is 90 degrees, and the first oil return channel (37) and the second oil return channel (38) are respectively in a closed state and an open state when the second planar cam (39) rotates 90 degrees.

7. The automotive oil tank switching valve with the time-delay oil return function according to claim 1, wherein: the lower end faces of the first flat cam (8) and the second flat cam (39) are positioned through a positioning partition plate (15) and are respectively installed on the first oil channel shaft (11) and the second oil channel shaft (41), the upper end faces of the first flat cam (8) and the second flat cam (39) are positioned through a positioning ring (14), the positioning ring (14) is positioned and installed on the first oil channel shaft (11) and the second oil channel shaft (41) through an elastic check ring (13), and the elastic check ring (13) is installed on a shaft collar of the first oil channel shaft (11) and the second oil channel shaft (41).

8. The method for operating the automotive fuel tank switching valve with the delayed oil return function according to any one of claims 1 to 7 is characterized by comprising the following steps:

firstly, respectively communicating a first oil inlet channel (18) and a second oil inlet channel (19) of a conversion valve with oil outlets of a first oil tank and a second oil tank through oil pipes, and communicating a total oil outlet (10) with an oil supply pipeline; a first oil return channel (37) and a second oil return channel (38) are communicated with oil return ports of a first oil tank and a second oil tank through oil pipes, and a main oil return port (34) is communicated with an oil return pipeline;

secondly, initially, an ejector rod of a second ejector rod switching device (20) is positioned at the far rest end of the first cam groove (9), and at the moment, a valve core of the second ejector rod switching device (20) is jacked up under the action of a return spring, so that a second oil passing channel (21) is opened, a first oil inlet channel (18) is communicated with a main oil outlet (10), and oil is supplied to an oil supply pipeline;

thirdly, after the fuel oil in the first oil tank is used up, pressing a servo control button to enable the motor (2) to rotate, further driving the first plane cam (8) to rotate, further enabling the phase angle of the first plane cam (8) to rotate 90 degrees, at the moment, the phase angle of the first cam groove (9) is also converted to 90 degrees, enabling the second ejector rod switching device (20) to close the second oil passing channel (21), enabling the first ejector rod switching device to open the first oil passing channel (26), further enabling the first oil passing channel (19) to be communicated with the main oil outlet (10) through the second oil inlet channel (19), supplying oil to the oil supply pipeline, and completing switching of oil supply of the two oil tanks; at the moment, the valve core assembly of the mandril switching device of the first oil return channel (37) and the second oil return channel (38) maintains the original state;

fourthly, the motor (2) is controlled by the control circuit to rotate again after a certain time delay, so that the second planar cam (39) is driven to rotate, the phase angle of the second planar cam (39) is rotated by 90 degrees, the phase angle of the second cam groove (40) is converted by 90 degrees at the moment, the first oil return channel (37) is closed by the valve core assembly of the first oil return channel (37) in a descending mode, the second oil return channel (38) is opened by the valve core assembly of the second oil return channel (38) in an ascending mode under the action of a return spring, the first oil return channel (37) and the second oil return channel (38) are converted, the valve core assemblies of the ejector rod switching devices of the first oil inlet channel (18) and the second oil inlet channel (19) are kept unchanged at the original state, and the oil tank conversion is completed at the moment;

and fifthly, when the fuel in the second oil tank is used up, the operation process is circulated according to the same method, and finally, the oil circulation supply of the two oil tanks is realized.

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