A multifunctional control valve assembly, a backflush fan structure, and a method for controlling heat dissipation.

Abstract

This invention relates to a multifunctional control valve assembly, a reverse-blowing fan structure, and a method for controlling heat dissipation. The multifunctional control valve assembly includes valve one and valve three. Valve one has an oil inlet, an oil outlet, and a return oil port. The oil inlet is connected to one end of an oil inlet pipeline, the oil outlet is connected to one end of a supply pipeline, and the return oil port is connected to one end of a return pipeline. Valve three has two interfaces, interface one and interface two, which can be connected or disconnected. Interface one is connected to the supply pipeline via pipeline one, and interface two is connected to the return pipeline via pipeline two. This invention uses the control valve assembly to achieve hydraulic control of the reverse-blowing fan in three states: forward blowing, reverse blowing, and zero sway angle. With the fan speed remaining constant, the direction and volume of airflow can be changed by switching between these three states. This not only enables the reverse-blowing function of the fan but also controls the heat dissipation of the fan, automatically adjusting the heat dissipation according to the cooling requirements to achieve energy saving and noise reduction.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation technology for harvesters, specifically to a multi-functional control valve group, a back-blowing fan structure, and a method for controlling heat dissipation. Background Technology

[0002] Agricultural combine harvesters operate at low speeds and lack a frontal airflow, relying primarily on cooling fans for forced cooling of various systems. Current harvester fans are either directly driven by the engine crankshaft or driven by a crankshaft-pulley system. A key characteristic of this method is that the fan speed is only related to the engine speed. This leads to several drawbacks: because the engine speed is not controlled by cooling demand, the fan's cooling output cannot be synchronized with the demand, resulting in wasted power; most engines operate optimally between 85°C and 95°C; when starting the engine at a lower temperature, the fan speed exceeds the required cooling capacity, prolonging the coolant's warm-up process, reducing engine combustion efficiency, and affecting engine performance; furthermore, fan noise is a factor to consider. Therefore, developing a harvester cooling fan control system to effectively control heat dissipation is crucial for overall energy saving, noise reduction, and improved fuel efficiency.

[0003] Meanwhile, the harsh working environment of agricultural harvesters inevitably causes the radiators to accumulate a large amount of debris and dust, resulting in poor heat dissipation and high-temperature alarms for the cooling water. Cleaning takes up harvesting time, and users urgently need a solution to this problem. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a multifunctional control valve group, a back-blowing fan structure and a method for controlling heat dissipation, in order to solve the problems in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A multifunctional control valve assembly includes valve one and valve three. Valve one is provided with an oil inlet, an oil outlet, and a return oil port. The oil outlet can be connected to either the oil inlet or the return oil port. The oil inlet is connected to one end of an oil inlet pipeline, and the other end of the oil inlet pipeline is connected to an oil tank. The oil outlet is connected to one end of a supply oil pipeline, and the other end of the supply oil pipeline is connected to an actuator. The return oil port is connected to one end of a return oil pipeline, and the other end of the return oil pipeline is connected to an oil tank.

[0007] The valve three is provided with an interface one and an interface two that can be connected or disconnected from each other. The interface one is connected to the oil supply pipeline through a pipeline one, and the interface two is connected to the oil return pipeline through a pipeline two.

[0008] The beneficial effects of this invention are as follows: During operation, when both valve one and valve three are de-energized, the hydraulic fluid in the actuator is unloaded through valve three, achieving one execution state. When both valve one and valve three are energized, the hydraulic fluid enters the actuator, causing it to achieve another execution state. Using the above-mentioned multi-functional control valve group allows the actuator to switch between different states to solve different problems. Its applications are wide-ranging, such as in agricultural machinery hydraulic systems or automotive hydraulic systems, especially in back-blowing fan structures for reasonable control of heat dissipation.

[0009] The multifunctional control valve assembly provided by this invention has a simple structure, reasonable design, sensitive control, fast switching speed, and convenient control.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, it also includes a metering cylinder and a second valve. The second valve is provided with an oil inlet, an oil outlet, and a return port. The oil outlet can be connected to the oil inlet or the return port. The oil inlet is connected to the oil inlet pipeline through a third pipeline, and the return port is connected to the return pipeline through a fourth pipeline.

[0012] The metering cylinder is equipped with a piston that can reciprocate from one end to the other, dividing the space inside the metering cylinder into two independent chambers, a and b. Chamber a is connected to the connection between the oil supply line and the other end of the oil supply line via pipe five. Chamber b is connected to the oil outlet two via pipe six.

[0013] The beneficial effect of adopting the above-mentioned further solution is that during operation, when both valve one and valve three are de-energized, the oil in the built-in oil cylinder of the back-blowing fan is unloaded through valve three, and the piston stroke of the built-in oil cylinder of the back-blowing fan is at its minimum. At this time, the fan is in the forward rotation cooling state.

[0014] When both valve one and valve three are energized, the piston stroke of the built-in oil cylinder of the back-blowing fan is at its maximum position, and the fan is in a back-blowing state to perform cleaning.

[0015] When both valves two and three are energized, the oil pushes the piston of the metering cylinder to its maximum stroke to provide a metered amount of oil to the built-in oil cylinder of the backflush fan;

[0016] This solution uses a control valve group to achieve hydraulic control of the three states of the back-blowing fan: forward blowing, reverse blowing, and zero sway angle. With the fan speed remaining constant, the direction and volume of airflow can be changed by switching between the three states. It can not only realize the function of fan reverse blowing, but also realize the control of fan heat dissipation. It can automatically adjust the heat dissipation according to the heat dissipation needs to achieve the effect of energy saving and noise reduction.

[0017] Furthermore, the piston has a cylindrical structure with at least one annular groove, and a support ring is installed in each annular groove.

[0018] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable, and the stability of piston movement can be further guaranteed by the support ring.

[0019] Furthermore, the piston is also provided with an annular groove II, and a sealing ring is installed in the annular groove II.

[0020] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. By increasing the sealing between the piston and the inner wall of the metering cylinder through the sealing ring, the metering cylinder can ensure that the metering cylinder provides a metered amount of oil to the built-in oil cylinder of the backflush fan.

[0021] Furthermore, the piston is provided with a plurality of annular grooves, and a support ring is installed in each of the plurality of annular grooves.

[0022] The advantages of adopting the above-mentioned further solution are that it has a simple structure, reasonable design, and further ensures the stability of piston movement.

[0023] Furthermore, a one-way valve is fixedly installed on each of the pipeline one and / or the pipeline six and / or the oil supply pipeline.

[0024] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The one-way valve can ensure that the oil can only flow in the set direction. On the other hand, the one-way valves corresponding to valve one and valve two have pressure holding performance, ensuring that a certain amount of oil enters the built-in oil cylinder of the backflush fan to push the fan blades to the zero swing angle state.

[0025] Furthermore, the sixth pipeline and / or the oil supply pipeline are respectively connected to the return oil pipeline through safety pipelines, and overflow valves are fixedly installed on the two safety pipelines respectively.

[0026] The advantages of adopting the above-mentioned further solution are that it has a simple structure, reasonable design, and the overflow valve can effectively prevent excessive pressure in the corresponding pipeline, thereby preventing excessive system pressure and ensuring the safety of system operation.

[0027] Furthermore, valve one and / or valve two are two-position three-way valves, and valve three is a two-position two-way valve.

[0028] The advantages of adopting the above-mentioned further solutions are simple structure, reasonable valve selection, and guaranteed normal system operation.

[0029] The present invention also relates to a backflush fan structure, including a fan, a built-in hydraulic cylinder for the backflush fan, and a multi-functional control valve group as described above. The rodless chamber of the built-in hydraulic cylinder for the backflush fan is connected to the other end of the oil supply pipeline, and its telescopic rod is connected to the fan drive.

[0030] The beneficial effect of adopting the above-mentioned further solution is that the hydraulic control of the forward and reverse blowing states of the reverse blowing fan is realized by controlling the valve group. With the fan speed remaining constant, the direction and volume of air blowing and suction can be changed by switching between the two states. It can not only realize the function of reverse blowing of the fan, but also realize the control of the heat dissipation of the fan. The heat dissipation can be automatically adjusted according to the heat dissipation needs to achieve the effect of energy saving and noise reduction.

[0031] The present invention also relates to a method for controlling the heat dissipation of a fan structure as described above, comprising the following specific steps:

[0032] S1: Obtain the engine coolant temperature, hydraulic oil temperature, and air-to-air intercooler temperature, and send the corresponding temperature signals to the controller. The controller receives the corresponding temperature signals and performs comparative analysis.

[0033] S2: When at least one of the coolant temperature, the hydraulic oil temperature, and the air-to-air intercooler temperature exceeds its corresponding temperature threshold, the controller closes valve one, valve two, and valve three. The oil in the rodless chamber of the back-blowing fan's built-in cylinder is unloaded through valve three. The stroke of the back-blowing fan's built-in cylinder is at its minimum. The back-blowing fan's built-in cylinder controls the fan to rotate forward for heat dissipation.

[0034] When valve one and valve three are open and valve two is closed, the oil pushes the piston of the built-in cylinder of the back-blowing fan to the maximum stroke position. The built-in cylinder of the back-blowing fan controls the fan to be in the back-blowing state for back-blowing cleaning.

[0035] When the coolant temperature, the hydraulic oil temperature, and the air-to-air intercooler temperature are all lower than their respective temperature thresholds, the controller opens valve two and valve three and closes valve one. The built-in cylinder of the back-blowing fan reaches its maximum stroke, and the metered oil provided by the metering cylinder enters the rodless chamber of the built-in cylinder of the back-blowing fan. The built-in cylinder of the back-blowing fan can push the fan blades to the zero-swing position.

[0036] The beneficial effect of adopting the above-mentioned further solution is that during operation, when both valve one and valve three are de-energized, the oil in the built-in oil cylinder of the back-blowing fan is unloaded through valve three, and the piston stroke of the built-in oil cylinder of the back-blowing fan is at its minimum. At this time, the fan is in the forward rotation cooling state.

[0037] When valves one and three are energized and valve two is de-energized, the piston stroke of the built-in cylinder of the back-blowing fan is at its maximum position, and the fan blades are pushed to the zero-swing position, in a back-blowing state for cleaning.

[0038] When valves two and three are energized and valve one is de-energized, the built-in cylinder of the backflush fan reaches its maximum stroke. The metered oil supplied by the metering cylinder enters the rodless chamber of the built-in cylinder of the backflush fan, which can push the fan blades to the zero swing angle position.

[0039] This invention achieves hydraulic control of three states of the back-blowing fan: forward blowing, reverse blowing, and zero sway angle, through the control valve group. With the fan speed remaining constant, the direction and volume of airflow can be changed by switching between the three states. It can not only realize the function of fan reverse blowing, but also realize the control of fan heat dissipation. It can automatically adjust the heat dissipation according to the heat dissipation needs to achieve the effect of energy saving and noise reduction. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the present invention;

[0041] Figure 2 This is a schematic diagram of the principle of the reverse-blowing fan blowing forward in this invention;

[0042] Figure 3 This is a schematic diagram of the back-blowing fan in this invention.

[0043] Figure 4 This is a schematic diagram of the back-blowing fan at zero oscillation angle in this invention;

[0044] Figure 5 This is a schematic diagram of the principle when the metering cylinder returns to its initial position in this invention;

[0045] Figure 6 This is a schematic diagram of the internal structure of the metering cylinder in this invention.

[0046] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0047] 1. Valve 1; 2. Valve 3; 3. Oil inlet pipeline; 4. Oil supply pipeline; 5. Backflush fan built-in cylinder; 6. Oil return pipeline; 7. Metering cylinder; 8. Valve 2; 9. Piston; 10. Support ring; 11. Sealing ring; 12. Check valve; 13. Overflow valve; 14. Throttle valve. Detailed Implementation

[0048] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0052] Example 1

[0053] like Figures 1 to 6 As shown, this embodiment provides a multi-functional control valve assembly, including valve 1 and valve 2. Valve 1 has an oil inlet, an oil outlet, and a return port. The oil outlet can be connected to either the oil inlet or the return port. The oil inlet is connected to one end of the oil inlet pipe 3, and the other end of the oil inlet pipe 3 is connected to the oil tank. The oil outlet is connected to one end of the oil supply pipe 4, and the other end of the oil supply pipe 4 is connected to the actuator. The return port is connected to one end of the return pipe 6, and the other end of the return pipe 6 is connected to the oil tank.

[0054] The valve 2 is provided with an interface 1 and an interface 2 that can be connected or disconnected. The interface 1 is connected to the oil supply pipeline 4 through a pipeline 1, and the interface 2 is connected to the oil return pipeline 6 through a pipeline 2.

[0055] Preferably, in this embodiment, valve 1 and valve 2 are respectively preferred as solenoid valves.

[0056] Alternatively, valves 1 and 2 mentioned above can also be manual valves.

[0057] During operation, when both valve 1 and valve 2 are de-energized, the hydraulic fluid in the actuator is unloaded through valve 2, achieving one operating state. When both valve 1 and valve 2 are energized, the hydraulic fluid enters the actuator, causing it to achieve another operating state. This multi-functional control valve assembly allows the actuator to switch between different states to solve various problems. It has wide applications, such as in agricultural machinery hydraulic systems or automotive hydraulic systems, and especially in back-blowing fan structures for efficient heat dissipation control.

[0058] The multi-functional control valve assembly provided in this embodiment has a simple structure, reasonable design, sensitive control, fast switching speed, and convenient control.

[0059] Preferably, in this embodiment, a throttle valve 14 is fixedly installed at one end of the oil inlet pipe 3. The throttle valve 14 ensures that when the high-flow-rate, high-pressure hydraulic pump supplies oil, it provides the back-blowing fan built-in cylinder 5 with appropriate flow and pressure.

[0060] This embodiment is applied to the reverse-blowing function of a fan. It uses a control valve group to achieve hydraulic control of the forward and reverse-blowing states of the reverse-blowing fan. With the fan speed remaining constant, the direction and volume of airflow can be changed by switching between the two states. It can not only realize the function of reverse-blowing the fan, but also control the heat dissipation of the fan. It can automatically adjust the heat dissipation according to the heat dissipation needs to achieve the effect of energy saving and noise reduction.

[0061] Example 2

[0062] Based on Embodiment 1, this embodiment also includes a metering cylinder 7 and a valve 2 8. The valve 2 8 is provided with an oil inlet 2, an oil outlet 2 and an oil return port 2. The oil outlet 2 can be connected to the oil inlet 2 or the oil return port 2. The oil inlet 2 is connected to the oil inlet pipeline 3 through pipeline 3, and the oil return port 2 is connected to the oil return pipeline 6 through pipeline 4.

[0063] The metering cylinder 7 is equipped with a piston 9, which can reciprocate along one end of the metering cylinder 7 to the other end, and divide the space inside the metering cylinder 7 into two independent chambers, a and b. Chamber a is connected to the connection between the oil supply line 4 and the other end of the oil supply line 4 through pipe five, and chamber b is connected to the oil outlet 2 through pipe six.

[0064] Preferably, in this embodiment, the valve 8 is a solenoid valve.

[0065] Preferably, in this embodiment, the oil inlet 2 is connected to the part between the two ends of the oil inlet pipe 3 via the pipe 3, or it can be connected to the part of the oil inlet pipe 3 near its end.

[0066] Based on the above scheme, one end of pipe five is connected to cavity a, while the part between the connection point of pipe two and oil supply pipe 4 and the other end of oil supply pipe 4 is connected to the other end of pipe five.

[0067] During operation, when both valve 1 and valve 2 are de-energized, the oil in the built-in cylinder 5 of the back-blowing fan is unloaded through valve 2, and the piston stroke of the built-in cylinder 5 of the back-blowing fan is at its minimum. At this time, the fan is in forward rotation for heat dissipation.

[0068] When both valve 1 and valve 2 are energized, the piston stroke of the built-in oil cylinder 5 of the back-blowing fan is at its maximum position, and the fan is in a back-blowing state to perform cleaning.

[0069] When both valve 2 (8) and valve 3 (2) are energized, the oil pushes the piston of the metering cylinder 7 to its maximum stroke to provide a metered amount of oil to the built-in oil cylinder 5 of the backflush fan;

[0070] This solution uses a control valve group to achieve hydraulic control of the three states of the back-blowing fan: forward blowing, reverse blowing, and zero sway angle. With the fan speed remaining constant, the direction and volume of airflow can be changed by switching between the three states. It can not only realize the function of fan reverse blowing, but also realize the control of fan heat dissipation. It can automatically adjust the heat dissipation according to the heat dissipation needs to achieve the effect of energy saving and noise reduction.

[0071] Example 3

[0072] Based on Embodiment 2, in this embodiment, the piston 9 has a cylindrical structure and is provided with at least one annular groove, and a support ring 10 is installed in each annular groove.

[0073] The scheme has a simple structure and reasonable design. The support ring 10 can further ensure the stability of piston movement.

[0074] Example 4

[0075] Based on embodiment 3, in this embodiment, the piston 9 is further provided with an annular groove 2, and a sealing ring 11 is installed in the annular groove 2.

[0076] The scheme has a simple structure and reasonable design. The sealing ring 11 increases the sealing between the piston and the inner wall of the metering cylinder 7, ensuring that the metering cylinder 7 provides a metered amount of oil to the built-in oil cylinder 5 of the backflush fan.

[0077] Example 5

[0078] Based on any one of Embodiments 3 to 4, in this embodiment, the piston 9 is provided with a plurality of annular grooves, and a support ring 10 is installed in each of the plurality of annular grooves.

[0079] The scheme has a simple structure and a reasonable design, which further ensures the stability of piston 9 movement.

[0080] Based on the above scheme, the number of the above-mentioned annular groove one is preferably two, with the two annular groove one located at the two ends of the piston 9 respectively, and the annular groove two located in the middle of the piston 9.

[0081] Example 6

[0082] Based on any one of Embodiments 2 to 5, in this embodiment, a one-way valve 12 is fixedly installed on the pipeline 1 and / or the pipeline 6 and / or the oil supply pipeline.

[0083] The scheme has a simple structure and reasonable design. The one-way valve 12 can ensure that the oil can only flow in the set direction. On the other hand, the one-way valves corresponding to valve 1 and valve 8 have pressure holding performance, ensuring that a certain amount of oil enters the built-in oil cylinder 5 of the backflush fan to push the fan blades to the zero swing angle state.

[0084] Preferably, in this embodiment, the one-way valve 12 is a solenoid valve.

[0085] Based on the above scheme, the one-way valve 12 on the oil supply line 4 is located between the connection point of the corresponding pipeline 1 and the valve 1 on the oil supply line 4.

[0086] Example 7

[0087] Based on any one of Embodiments 2 to 6, in this embodiment, the pipeline 6 and / or the oil supply pipeline 4 are respectively connected to the oil return pipeline 6 through a safety pipeline, and an overflow valve 13 is fixedly installed on each of the two safety pipelines.

[0088] The solution has a simple structure and reasonable design. The overflow valve 13 can effectively prevent excessive pressure in the corresponding pipeline, thereby preventing excessive system pressure and ensuring the safety of system operation.

[0089] Based on the above scheme, one end of one safety pipeline is connected to oil supply pipeline 4, and the connection point between it and oil supply pipeline 4 is located between the corresponding one-way valve 12 and valve 1; the connection point between one end of the other safety pipeline and pipeline 6 is located between the corresponding one-way valve 12 and valve 2.

[0090] Preferably, in this embodiment, each of the above-mentioned overflow valves 13 is preferably a solenoid valve.

[0091] In addition, the two overflow valves 13 ensure that the working pressure of the fan backflushing the built-in oil cylinder is kept below 5MPa.

[0092] Example 8

[0093] Based on any one of Embodiments 2 to 7, in this embodiment, valve 1 and / or valve 8 are two-position three-way valves, and valve 2 is a two-position two-way valve.

[0094] The solution has a simple structure and reasonable valve selection, ensuring the normal operation of the system.

[0095] Example 9

[0096] Based on the above embodiments, this embodiment also provides a backflush fan structure, including a fan, a built-in hydraulic cylinder 5 for the backflush fan, and a multi-functional control valve group as described above. The rodless chamber of the built-in hydraulic cylinder 5 for the backflush fan is connected to the other end of the oil supply pipeline 4, and its telescopic rod is connected to the fan drive.

[0097] This solution uses a control valve group to hydraulically control the forward and reverse blowing states of the reverse blowing fan. With the fan speed remaining constant, the direction and volume of airflow can be changed by switching between the two states. It can not only realize the function of reverse blowing of the fan, but also realize the control of the fan's heat dissipation. It can automatically adjust the heat dissipation according to the heat dissipation needs to achieve the effect of energy saving and noise reduction.

[0098] Example 10

[0099] Based on Example 9, this example also provides a method for controlling the heat dissipation of a fan structure with the reverse-blowing fan structure described above, including the following specific steps:

[0100] S1: Obtain the engine coolant temperature, hydraulic oil temperature, and air-to-air intercooler temperature, and send the corresponding temperature signals to the controller. The controller receives the corresponding temperature signals and performs comparative analysis.

[0101] S2: When at least one of the coolant temperature, the hydraulic oil temperature, and the air-to-air intercooler temperature exceeds its corresponding temperature threshold, the controller closes valve 1, valve 2, and valve 3. The oil in the rodless chamber of the back-blowing fan built-in cylinder 5 is unloaded through valve 3. The stroke of the back-blowing fan built-in cylinder 5 is at its minimum. The back-blowing fan built-in cylinder 5 controls the fan to rotate forward for heat dissipation.

[0102] When valve 1 and valve 2 are open and valve 8 is closed, the oil pushes the piston of the built-in cylinder 5 of the back-blowing fan to the maximum stroke position. The built-in cylinder 5 of the back-blowing fan controls the fan to be in the back-blowing state for back-blowing cleaning.

[0103] When the coolant temperature, the hydraulic oil temperature, and the air-to-air intercooler temperature are all lower than their respective temperature thresholds, the controller opens valve 2 and valve 3 and closes valve 1. The metered oil supplied by the metering cylinder 7 enters the rodless chamber of the built-in cylinder 5 of the back-blowing fan, and the built-in cylinder 5 of the back-blowing fan reaches its maximum stroke. The built-in cylinder 5 of the back-blowing fan can push the fan blades to the zero-swing position.

[0104] This solution uses a control valve group to achieve hydraulic control of the three states of the back-blowing fan: forward blowing, reverse blowing, and zero sway angle. With the fan speed remaining constant, the direction and volume of airflow can be changed by switching between the three states. It can not only realize the function of fan reverse blowing, but also realize the control of fan heat dissipation. It can automatically adjust the heat dissipation according to the heat dissipation needs to achieve the effect of energy saving and noise reduction.

[0105] Based on the above scheme, the specific heat dissipation control measures are as follows:

[0106] 1) The real-time temperature of the controlled object, such as engine coolant temperature, hydraulic oil temperature, and air-to-air intercooler temperature, is detected by temperature sensors and input to the cooling controller. The controller then outputs a corresponding control strategy based on the coolant temperature value. Generally, the optimal operating temperature for an engine is 85℃~95℃.

[0107] 2) When the coolant temperature is below 85℃, adjust the back-blowing fan to zero sway angle to raise the engine coolant temperature to above 85℃ as quickly as possible to improve working efficiency.

[0108] 3) When the coolant temperature is higher than 85℃, adjust the back-blowing fan to the forward-blowing mode to control the engine coolant temperature below 95℃;

[0109] 4) When the hydraulic oil temperature is higher than 90℃, adjust the back-blowing fan to the forward-blowing state.

[0110] The working principle of this invention is as follows:

[0111] 1) All valves are de-energized. The oil in the rodless chamber of the built-in cylinder 5 of the backflush fan is unloaded through the check valve 12 on pipeline 1 and valve 2 on pipeline 3. The piston stroke of the built-in cylinder 5 of the backflush fan is at its minimum and the fan is in the forward blowing state.

[0112] 2) When valve 1 and valve 2 are energized, the oil pushes the piston of the built-in oil cylinder 5 of the back-blowing fan to the maximum stroke position, and the fan is in the back-blowing state to perform back-blowing cleaning;

[0113] 3) When valves 2 and 3 are energized, the oil pushes the piston of the metering cylinder 7 to the maximum stroke. Since the check valves 12 corresponding to valves 1 and 2 have pressure holding performance, the metered oil enters the built-in oil cylinder 5 of the backflush fan, which can push the fan blades to the zero swing angle state (a single blade rotates around itself, and no air comes out).

[0114] 4) When valve 1 is energized, the oil will return to the oil tank through the corresponding check valve 12 and valve 2. Since check valve 12 can generate back pressure, it can push the piston of the metering cylinder 7 to the initial state, preparing to pump a metered amount of oil into the built-in oil cylinder 5 of the backflush fan. This operation is performed before switching to the zero swing angle state. When the pressure holding time of the corresponding check valve 12 and valve 2 does not meet the requirements, the zero swing angle state switching action can be repeated (repeated above action) to maintain the accuracy of the zero swing angle state.

[0115] 5) The working positions of the one-way valve 12 corresponding to valve 1 and valve 2 and valve 3 have pressure holding performance, which can keep the built-in oil cylinder of the back-blowing fan in a fixed position for a period of time. After switching states, valve 1 and valve 2 do not need to be powered for a long time.

[0116] The advantages of this invention are:

[0117] (1) The present invention uses a multi-functional valve group for the reverse fan to control the reverse fan. It can not only realize the function of the fan reverse blowing, but also realize the control of heat dissipation by integrating with the heat dissipation controller and temperature sensor. It can automatically adjust the heat dissipation according to the heat dissipation needs to achieve the effect of energy saving and noise reduction.

[0118] (2) The present invention provides a method for controlling heat dissipation, which eliminates the need to control the heat dissipation of the radiator by controlling the fan speed;

[0119] (3) The valve group of the present invention is small in size, and the whole vehicle can be easily integrated and installed on the basis of the original hydraulic system.

[0120] It should be noted that the bolded lines in the various attached figures merely represent the flow trajectory of the hydraulic oil and have no other substantial meaning.

[0121] Furthermore, all electronic components involved in this invention employ existing technology, and all of the aforementioned components are electrically connected to the controller, while the control circuit between the controller and each component is existing technology.

[0122] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0123] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0124] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multifunctional control valve assembly, characterized in that: It includes valve one (1) and valve three (2). Valve one (1) is provided with an oil inlet one, an oil outlet one and an oil return one. The oil outlet one can be connected to the oil inlet one or the oil return one. The oil inlet one is connected to one end of the oil inlet pipeline (3), and the other end of the oil inlet pipeline (3) is used to connect to the oil tank. The oil outlet one is connected to one end of the oil supply pipeline (4), and the other end of the oil supply pipeline (4) is used to connect to the actuator. The oil return one is connected to one end of the oil return pipeline (6), and the other end of the oil return pipeline (6) is used to connect to the oil tank. The valve three (2) is provided with interface one and interface two that can be connected or disconnected from each other. One port is connected to the oil supply pipeline (4) through one pipeline, and the other port is connected to the return oil pipeline (6) through another pipeline. It also includes a metering cylinder (7) and a valve two (8), the valve two (8) is provided with an oil inlet two, an oil outlet two and an oil return two, the oil outlet two can be connected to the oil inlet two or the oil return two; the oil inlet two is connected to the oil inlet pipeline (3) through pipeline three, and the oil return two is connected to the oil return pipeline (6) through pipeline four; The metering cylinder (7) is equipped with a piston (9), which can move along the metering cylinder (7). The cylinder moves back and forth from one end to the other, dividing the space inside the metering cylinder (7) into two independent chambers, a and b. Chamber a is connected to the connection between the pipeline and the oil supply pipeline (4) and the other end of the oil supply pipeline (4) through pipeline five. Chamber b is connected to the oil outlet two through pipeline six. One-way valves (12) are fixedly installed on the pipeline one and / or the pipeline six and / or the oil supply pipeline (4); The pipeline 6 and / or the oil supply pipeline (4) are respectively connected to the oil return pipeline (6) through safety pipelines, and relief valves (13) are fixedly installed on the two safety pipelines respectively.

2. The multifunctional control valve assembly according to claim 1, characterized in that: The piston (9) has a cylindrical structure and at least one annular groove is provided on it. Each annular groove is equipped with a support ring (10).

3. The multifunctional control valve assembly according to claim 2, characterized in that: The piston (9) is also provided with an annular groove II, and a sealing ring (11) is installed in the annular groove II.

4. The multifunctional control valve assembly according to claim 2, characterized in that: The piston (9) is provided with a plurality of annular grooves, and a support ring (10) is installed in each of the plurality of annular grooves.

5. The multifunctional control valve assembly according to any one of claims 1-4, characterized in that: Valve 1 (1) and / or valve 2 (8) are two-position three-way valves, and valve 3 (2) is a two-position two-way valve.

6. A backflush fan structure, comprising a fan, characterized in that: It also includes a built-in hydraulic cylinder (5) for a backflush fan and a multi-functional control valve assembly as described in any one of claims 1-5, wherein the rodless chamber of the built-in hydraulic cylinder (5) for the backflush fan is connected to the other end of the oil supply line (4), and its telescopic rod is connected to the fan drive.

7. A method for controlling the heat dissipation amount using the reverse-blowing fan structure as described in claim 6, characterized in that, The specific steps include the following: S1: Obtain the engine coolant temperature, hydraulic oil temperature, and air-to-air intercooler temperature, and send the corresponding temperature signals to the controller. The controller receives the corresponding temperature signals and performs comparative analysis. S2: When at least one of the coolant temperature, the hydraulic oil temperature and the air-to-air intercooler temperature exceeds its corresponding temperature threshold, the controller closes valve one (1), valve two (8) and valve three (2), the oil in the rodless chamber of the back-blowing fan built-in cylinder (5) is unloaded through valve three (2), the stroke of the back-blowing fan built-in cylinder (5) is at its minimum, and the back-blowing fan built-in cylinder (5) controls the fan to rotate forward for heat dissipation. When valve one (1) and valve three (2) are open and valve two (8) is closed, the oil pushes the piston of the built-in oil cylinder (5) of the back-blowing fan to the maximum stroke position, and the built-in oil cylinder (5) of the back-blowing fan controls the fan to be in the back-blowing state for back-blowing cleaning; When the coolant temperature, the hydraulic oil temperature, and the air-cooled air temperature are all lower than their respective temperature thresholds, the controller opens valve two (8) and valve three (2) and closes valve one (1). The metered oil provided by the metering cylinder (7) enters the rodless chamber of the built-in cylinder (5) of the back-blowing fan. The built-in cylinder (5) of the back-blowing fan reaches its maximum stroke and can push the fan blades to the zero-swing position.

Images