A fan adjustment structure, refrigerated vehicle and refrigerated vehicle control method

Abstract

The present invention provides a fan adjustment structure, a refrigerated vehicle and a refrigerated vehicle control method, wherein the fan adjustment structure includes: a unit housing, an air inlet arranged at the front end of the unit housing, an air outlet arranged at the top of the unit housing, a heat exchanger arranged between the air inlet and the air outlet, a fan assembly arranged at the air outlet, and also includes: an adjusting device for adjusting the air outlet angle and / or air inlet volume of the fan assembly. The fan adjustment structure, refrigerated vehicle and refrigerated vehicle control method provided by the present invention can judge the operating state of the external fan by detecting the air exhaust volume outside the external fan, and can rotate the fan assembly around the rotating shaft through an electric screw mechanism to change the air outlet angle of the fan, thereby avoiding the influence of backflow wind on the fan exhaust; if the influence of backflow wind on the fan cannot be completely avoided by changing the fan angle, the fan operating frequency can be further controlled to ensure the heat exchange efficiency of the condenser, thereby ensuring the stability of the cooling capacity.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and in particular to a fan adjustment structure suitable for a top-out refrigerated truck, a refrigerated truck and a refrigerated truck control method. Background Art

[0002] The refrigeration unit of a traditional top-outlet refrigerated truck usually adopts a split design of internal and external units, in which the external unit is installed on the top of the vehicle body, the air inlet is set at the front end of the external unit, the air outlet is placed vertically on the top of the external unit, and a condensing fan is installed in the external unit, forming a closed air duct structure from the air inlet to the air outlet inside the external unit. Due to the uncertainty of natural wind, it will cause great interference to the operation of the fan, especially when the refrigerated truck is in a downhill high-speed driving state for a long time. Due to the existence of the inclination angle, it is easy to cause wind backflow, thereby increasing the friction resistance and energy loss of the equipment, affecting the normal operation of the condensing fan, and at the same time, the closed structure space inside the fan is in a positive pressure difference state, which affects the exhaust volume (air volume) of the fan, and then affects the heat exchange efficiency of the condenser, resulting in unstable cooling capacity.

[0003] In the prior art, a patent discloses a control method, device, air conditioner and storage medium for an external fan, which reduces the power consumption of the air conditioner by detecting whether there is air outlet resistance at the air outlet of the external fan and controlling the external fan according to the naturally generated air volume. However, the patent does not solve the problem of the exhaust volume of the fan affected by the natural wind resistance, and is not suitable for the control of the external fan of the refrigeration unit of the refrigerated truck; another patent discloses a control method for the top-outlet outdoor fan, which improves the heat exchange efficiency of the outdoor unit by judging whether the outdoor fan enters the rain operation mode and controlling the rotation direction of the outdoor fan. The patent only addresses the problem of the impact of rain on the fan, and does not involve the wind resistance of the external fan, and is not suitable for the control of the external fan of the refrigeration unit of the refrigerated truck. Summary of the invention

[0004] In order to solve the technical problems in the above-mentioned prior art that when a refrigerated truck is traveling downhill, due to the inclination angle, wind backflow is caused, thereby increasing the friction resistance and energy loss of the fan, and at the same time causing the closed space inside the fan to be in a positive pressure difference, resulting in a decrease in the fan air volume, affecting the heat exchange efficiency of the condenser, and causing unstable cooling capacity, the present invention proposes a fan adjustment structure, a refrigerated truck and a refrigerated truck control method that are particularly suitable for top-outlet refrigerated trucks.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The present invention proposes a fan adjustment structure, comprising: a unit housing, an air inlet arranged at the front end of the unit housing, an air outlet arranged at the top end of the unit housing, a heat exchanger arranged between the air inlet and the air outlet, a fan assembly arranged at the air outlet, and further comprising:

[0007] An adjusting device for adjusting the air outlet angle and / or air inlet volume of a fan assembly.

[0008] Furthermore, the adjusting device comprises:

[0009] A hinge, one end of which is fixedly mounted on the unit housing, and the other end of which is hinged to one end of the fan assembly;

[0010] a power mechanism disposed at the other end of the fan assembly;

[0011] A connecting member, one end of which is hinged to the other end of the fan assembly, and the other end of which is hinged to the moving member of the power mechanism;

[0012] The power mechanism controls the air outlet angle of the fan assembly.

[0013] Further, the fan assembly includes: a casing, a fan installed in the casing;

[0014] The power mechanism comprises: a screw nut assembly installed on the unit housing, and the screw nut assembly drives the moving part to move parallel to the front end of the unit housing.

[0015] Preferably, when the air outlet direction of the air outlet is perpendicular to the horizontal plane, the air outlet direction of the fan assembly is perpendicular to the horizontal plane;

[0016] When the air outlet direction of the air outlet has an inclination angle relative to the horizontal plane and the air outlet is inclined toward the wind, the fan assembly rotates in a direction opposite to the inclination direction of the inclination angle under the action of the power mechanism and the connecting member.

[0017] Furthermore, it also includes: a displacement sensor installed on the unit housing, which is used to sense whether the moving position of the moving part reaches the displacement limit value.

[0018] Preferably, the lead screw nut assembly and the fan are both driven by a stepper motor;

[0019] The hinged member adopts a support rod, one end of which is fixedly mounted on the unit housing, and the other end of which is hinged to one end of the housing through a first hinge shaft;

[0020] The connecting member adopts a connecting rod, one end of which is hinged to the other end of the casing through a second hinge shaft, and the other end of the connecting rod is hinged to the moving member through a third hinge shaft.

[0021] Furthermore, it also includes:

[0022] A sealing ring provided between the air outlet and the housing;

[0023] The regulating device also includes: a driver connected to the motor of the fan assembly.

[0024] Preferably, an air volume sensor is provided on the outside of the air outlet to detect the real-time exhaust volume Q of the fan assembly, and a controller is provided to adjust the air outlet angle and / or air inlet volume of the fan assembly according to the real-time exhaust volume Q and the set exhaust volume Qa.

[0025] The present invention also provides a refrigerated vehicle, comprising a vehicle body, an internal unit and an external unit respectively arranged inside and outside the vehicle body, wherein the external unit adopts the above-mentioned fan adjustment structure, and the heat exchanger adopts a condenser.

[0026] The present invention also provides a refrigerated truck control method, which uses the above-mentioned refrigerated truck and comprises the following steps:

[0027] The air volume sensor detects the real-time exhaust volume Q of the fan;

[0028] The air outlet angle and / or air inlet volume of the fan assembly is adjusted according to the real-time exhaust volume Q and the set exhaust volume Qa.

[0029] Further, adjusting the air outlet angle and / or air inlet volume of the fan assembly according to the real-time exhaust volume Q and the set exhaust volume Qa includes:

[0030] Count the total time T during which the real-time exhaust volume Q is less than or equal to the set exhaust volume Qa;

[0031] Determine whether the total duration T is greater than or equal to the critical duration T0;

[0032] If yes, the power mechanism is controlled to drive the fan assembly to rotate so as to adjust the air outlet angle of the fan assembly;

[0033] If not, return to continue detecting the real-time exhaust volume Q of the fan.

[0034] Further, if yes, the power mechanism is controlled to drive the moving part to move upward, driving the fan assembly to rotate in a direction opposite to the tilt direction of the front end of the unit housing, and the air outlet direction of the fan rotates synchronously, and further includes:

[0035] Recalculate the total time T during which the real-time exhaust volume Q is less than or equal to the set exhaust volume Qa;

[0036] Determine whether the total duration T is greater than or equal to the critical duration T0;

[0037] If yes, then return to control the power mechanism to drive the moving part to move upward;

[0038] If not, the power mechanism is controlled to stop, and the process returns to continue detecting the real-time exhaust volume Q of the fan.

[0039] Further, if so, before returning to control the power mechanism to drive the moving part to move upward, the method further includes:

[0040] Determine whether the moving parts of the power mechanism have reached the displacement limit value;

[0041] If yes, the power mechanism is controlled to stop, and based on the air volume difference between the set exhaust volume Qa and the real-time exhaust volume Q and the air outlet area S, the driver is controlled to adjust the operating frequency V of the fan;

[0042] If not, the control power mechanism is returned to drive the moving part to move upward.

[0043] Compared with the prior art, the fan adjustment structure, refrigerated truck and refrigerated truck control method provided by the present invention determine the operating status of the external fan by detecting the exhaust volume of the external fan, and can change the air outlet angle of the fan by rotating the fan assembly around the rotating axis through an electric screw mechanism, thereby avoiding the influence of backflow wind and positive pressure difference caused by natural wind on the fan exhaust during long-term continuous downhill driving of the refrigerated truck; if the influence of backflow wind on the fan cannot be completely avoided by changing the fan angle, the fan operating frequency can be further controlled to ensure the heat exchange efficiency of the condenser, thereby ensuring the stability of the cooling capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0045] Figure 1 It is a structural schematic diagram of a refrigerated vehicle in one embodiment of the present invention;

[0046] Figure 2 It is a structural schematic diagram of a fan adjustment structure in an embodiment of the present invention;

[0047] Figure 3 for Figure 2 A schematic diagram of the local enlarged structure of the middle A area;

[0048] Figure 4 The working principle of the fan adjustment structure of the refrigerated truck in one embodiment of the present invention when the refrigerated truck is in a downhill state is shown in FIG. Figure 1 ;

[0049] Figure 5 The working principle of the fan adjustment structure of the refrigerated truck in one embodiment of the present invention when the refrigerated truck is in a downhill state is shown in FIG. Figure 2 ;

[0050] Figure 6 The present invention is a flowchart of a refrigerated truck control method in one embodiment of the present invention.

[0051] Among them, the main marks of the drawings in the figure are:

[0052] 1-unit casing; 2-air inlet; 3-air outlet; 4-heat exchanger; 5-fan assembly; 51-casing; 52-fan; 6-adjusting device; 61-hinge; 611-first hinge shaft; 62-power mechanism; 621-moving part; 622-screw nut assembly; 63-connecting part; 631-second hinge shaft; 7-displacement sensor; 8-sealing ring; 9-electric control box; 10-air volume sensor; 11-external unit bracket; 111-fixing bolt; 12-internal unit. DETAILED DESCRIPTION

[0053] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the following is a summary of the technical problems, technical solutions and beneficial effects to be solved by the present invention. Figure 1-6 It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0054] Please also read Figure 1-3 The present invention proposes a fan 52 adjustment structure, comprising: a unit housing 1, an air inlet 2 arranged at the front end of the unit housing 1, an air outlet 3 arranged at the top end of the unit housing 1, a heat exchanger 4 arranged between the air inlet 2 and the air outlet 3, and a fan assembly 5 arranged at the air outlet 3; in this embodiment, the unit housing 1 is preferably rectangular, the front end of the unit housing 1 is perpendicular to the top end of the unit housing 1, the air inlet 2 is opened at the front end of the unit housing 1, and the air outlet 3 is opened at the top end of the unit housing 1 and perpendicular to the front end of the unit housing 1; in other embodiments, the unit housing 1 may also be trapezoidal; and further comprising: an adjusting device 6 for adjusting the air outlet angle and / or air inlet volume of the fan assembly 5.

[0055] In this embodiment, the adjusting device 6 includes: a hinge 61, one end of which is fixedly mounted on the unit housing 1, and the other end of the hinge 61 is hinged to one end of the fan assembly 5; a power mechanism 62 arranged at the other end of the fan assembly 5; a connecting member 63, one end of which is hinged to the other end of the fan assembly 5, and the other end of the connecting member 63 is hinged to a moving member 621 of the power mechanism 62; the power mechanism 62 controls the air outlet angle of the fan assembly 5.

[0056] In this embodiment, the fan assembly 5 includes: a casing 51, which can be a circular casing 51 or a rectangular casing 51, and the casing 51 is installed inside the unit casing 1 directly below the air outlet 3, and an exhaust port is provided on the top thereof, which faces the air outlet 3 on the unit casing 1 above it, that is, the axial direction of the exhaust port is parallel to the axial direction of the air outlet 3; a fan 52 installed in the casing 51; the fan 52 includes a motor installed in the casing 51 and fan blades connected to the output shaft of the motor; as an embodiment, the motor and the fan blades constitute an axial flow fan 52; as a preferred embodiment, the fan 52 is driven by a stepper motor, a driver is connected to the stepper motor, and the air outlet direction of the fan assembly 5, that is, the air outlet direction of the fan 52 is parallel to the axial direction of the air outlet at the top of the casing 51.

[0057] In this embodiment, the power mechanism 62 includes: a screw nut assembly 622 installed on the unit housing 1, the screw of the screw nut assembly 622 is parallel to the front end of the unit housing 1, and a moving member 621 can reciprocate and lift in a direction parallel to the front end of the unit housing 1 under the drive of the screw nut assembly 622. In this embodiment, the hinge 61 adopts a support rod, one end of which is fixedly installed on the unit housing 1, and the other end of the support rod is hinged to one end of the housing 51 through a first hinge shaft 611; the connecting member 63 adopts a connecting rod, one end of which is hinged to the other end of the housing 51 through a second hinge shaft 631, and the other end of the connecting rod is hinged to the moving member 621 through a third hinge shaft. In other embodiments, the hinge 61 can also be replaced by a bracket structure, and the connecting member 63 can also be replaced by a crank structure.

[0058] See also Figure 4-5 In this embodiment, when the air outlet direction of the air outlet 3 is perpendicular to the horizontal plane, the unit housing 1 can be regarded as being horizontally stationary or moving parallel to the horizontal plane. At this time, the air outlet of the casing 51 of the fan assembly 5 is directly opposite to the air outlet 3 below the air outlet 3 of the unit housing 1, and the axial direction of the air outlet is parallel to the axial direction of the air outlet 3 and perpendicular to the horizontal plane, that is, the air outlet direction of the fan assembly 5 is perpendicular to the horizontal plane and upward.

[0059] When the air outlet direction of the air outlet 3 has an inclination relative to the horizontal plane and the air outlet 3 is inclined to face the wind, the unit housing 1 can be regarded as in continuous downhill motion. At this time, the axial direction of the air outlet of the casing 51 of the fan assembly 5 is inclined from perpendicular to the horizontal plane to the direction close to the front end of the unit housing 1, that is, relative to the clockwise rotation, the inclination angle is the angle at which the axial direction of the air outlet is inclined from perpendicular to the horizontal plane to the front end of the unit housing 1. Similarly, the inclination angle is also the angle at which the air outlet direction of the fan assembly 5 is synchronously inclined from perpendicular to the horizontal plane to the front end of the unit housing 1 along with the air outlet. At this time, the moving part 621 of the power mechanism 62 moves in a direction perpendicular to the front end of the unit casing 1, and drives the connecting part 63 and the moving part 621 to rotate relative to each other. The connecting part 63 drives the casing 51 of the fan assembly 5 to rotate relative to the connecting part 63. The casing 51 of the fan assembly 5 rotates relative to the hinge 61 at the same time, so that the casing 51 of the fan assembly 5 rotates in a direction opposite to the inclination direction of the above-mentioned inclination angle, which is equivalent to counterclockwise rotation. The counterclockwise rotation is used to compensate for the angle difference between the air outlet direction of the fan assembly 5 and the horizontal plane, thereby improving the wind backflow phenomenon.

[0060] See also Figure 1-2 In this embodiment, the hinge 61 is away from the air inlet 2 relative to the connecting member 63, and the power mechanism 62 is close to the air inlet 2 relative to the hinge 61. When the air outlet direction of the air outlet 3 has an inclination angle relative to the horizontal plane and the air outlet 3 is tilted to the wind, the screw nut assembly 622 drives the moving part 621 to move upward in a direction perpendicular to the front end of the unit casing 1, so that the casing 51 of the fan assembly 5 rotates in a direction opposite to the inclination direction of the above-mentioned inclination angle; in another embodiment (not shown in the figure), the hinge 61 is close to the air inlet 2 relative to the connecting member 63, and the power mechanism 62 is away from the air inlet 2 relative to the hinge 61. When the air outlet direction of the air outlet 3 has an inclination angle relative to the horizontal plane and the air outlet 3 is tilted to the wind, the screw nut assembly 622 drives the moving part 621 to move downward in a direction perpendicular to the front end of the unit casing 1, so that the casing 51 of the fan assembly 5 rotates in a direction opposite to the inclination direction of the above-mentioned inclination angle.

[0061] In this embodiment, it further comprises: a displacement sensor 7 mounted on the housing 51, for sensing whether the moving position of the moving part 621 reaches the displacement limit value. As a preferred embodiment, the lead screw nut assembly 622 is driven by a stepping motor.

[0062] See also Figure 3As a preferred embodiment, the unit housing 1 is provided with an air volume sensor 10 on the outside of the air outlet 3, which is used to detect the real-time exhaust volume Q of the fan assembly 5; the controller adjusts the air outlet angle and / or air intake volume of the fan assembly 5 according to the real-time exhaust volume Q and the set exhaust volume Qa. As a more preferred embodiment, it also includes: a sealing ring 8 provided between the air outlet 3 and the housing 51; the sealing ring 8 is preferably made of a rubber sealing sleeve, and can be made of other sealing materials such as plastic; the sealing ring 8 is embedded between the fan assembly 5 and the air outlet 3 around the unit housing 1, and is used to seal the gap between the fan assembly 5 and the air outlet 3 around the fan assembly 5 when the fan 52 adjusts the angle of the fan assembly 5, so as to prevent air leakage.

[0063] The present invention also provides a refrigerated vehicle, comprising a vehicle body, an internal unit 12 and an external unit respectively arranged inside and outside the vehicle body, the external unit adopts the above-mentioned fan 52 adjustment structure, and its heat exchanger 4 adopts a condenser; the external unit is installed on the top of the vehicle body through an external unit bracket 11 and fixing bolts 111; an electric control box 9 is arranged in the vehicle body, and the controller is arranged in the electric control box 9, which can be arranged in the unit housing 1.

[0064] See also Figure 6 The present invention also provides a refrigerated truck control method, which uses the above-mentioned refrigerated truck and includes the following steps:

[0065] The air volume sensor 10 detects the real-time exhaust volume Q of the fan 52;

[0066] The controller adjusts the air outlet angle and / or air inlet volume of the fan assembly 5 according to the real-time exhaust volume Q and the set exhaust volume Qa.

[0067] In this embodiment, adjusting the air outlet angle and / or air inlet volume of the fan assembly 5 according to the real-time exhaust volume Q and the set exhaust volume Qa includes:

[0068] When the refrigerated truck is driving downhill, the total time T of the real-time exhaust volume Q being less than or equal to the set exhaust volume Qa is counted;

[0069] The controller determines whether the total time T is greater than or equal to the critical time T0 (T0 is preferably 4 seconds);

[0070] If so (it means that the backflow phenomenon has affected the normal operation of the fan), the power mechanism 62 is controlled to drive the moving part 621 to move upward, driving the fan assembly 5 to rotate in the direction opposite to the tilt direction of the front end of the unit housing 1, and the air outlet direction of the fan assembly 5 rotates synchronously to adjust the air outlet angle of the fan assembly 5 (that is, the fan assembly 5 rotates counterclockwise so that its rotation angle is opposite to the slope angle and the inclination angle);

[0071] If not, the process returns to continue detecting the real-time exhaust volume Q of the fan 52 .

[0072] In a preferred embodiment, if the above is the case, the power mechanism 62 is controlled to drive the moving member 621 to move upward, driving the fan assembly 5 to rotate in a direction opposite to the tilt direction of the front end of the unit housing 1, and the air outlet direction of the fan assembly 5 rotates synchronously to adjust the air outlet angle of the fan assembly 5, and then further includes:

[0073] Recalculate the total time T during which the real-time exhaust volume Q is less than or equal to the set exhaust volume Qa;

[0074] Determine whether the total duration T is greater than or equal to the critical duration T0;

[0075] If yes, the power mechanism 62 is returned to control the movement member 621 to move upward, driving the fan assembly 5 to rotate in the direction opposite to the inclination direction of the unit housing 1, and the air outlet direction of the fan 52 rotates synchronously;

[0076] If not (it means that the backflow phenomenon of the fan has been improved by changing the exhaust angle of the fan, and the motor is stopped to ensure that the exhaust angle remains unchanged), the power mechanism 62 is controlled to stop, and the process returns to continue detecting the real-time exhaust volume Q of the fan 52.

[0077] In a preferred embodiment, if so, the return control power mechanism 62 further includes:

[0078] The controller determines whether the moving part 621 of the power mechanism 62 has reached the displacement limit value according to the detection signal fed back by the displacement sensor 7;

[0079] If yes, the power mechanism 62 is controlled to stop, and based on the air volume difference between the set exhaust volume Qa and the real-time exhaust volume Q and the air outlet area S, the driver is controlled to increase the operating frequency V of the fan 52;

[0080] If not (it means that the backflow problem cannot be improved by changing the exhaust angle of the condensing fan, the controller sends a motor stop signal to prevent the motor from overloading, and further obtains the required operating frequency increment of the fan based on the relationship between the air volume difference, the air outlet area and the operating frequency V of the fan 52 to compensate for the exhaust volume difference, thereby ensuring the heat exchange efficiency of the condenser, and then ensuring the size and stability of the cooling capacity), the control power mechanism 62 returns to drive the moving part 621 to move upward and continue to drive the fan assembly 5 to rotate.

[0081] The present invention changes the structural design of the condensing fan and adds an electric screw mechanism to achieve the change of the air outlet angle of the condensing fan. First, by changing the air outlet angle, the influence of long-term backflow of wind on exhaust air when the refrigerated truck is driving downhill is avoided. If the first step cannot meet the requirements, the exhaust volume difference is further compensated by changing the fan operating frequency to ensure the heat exchange efficiency of the condenser, thereby ensuring the stability of the cooling capacity.

[0082] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fan adjustment structure, comprising: A unit housing, an air inlet provided at the front end of the unit housing, an air outlet provided at the top end of the unit housing, a heat exchanger provided between the air inlet and the air outlet, and a fan assembly provided at the air outlet, characterized in that it also includes: An adjusting device for adjusting the air outlet angle of the fan assembly; The regulating device comprises: A hinge, one end of which is fixedly mounted on the unit housing, and the other end of which is hinged to one end of the fan assembly; a power mechanism disposed at the other end of the fan assembly; A connecting member, one end of which is hinged to the other end of the fan assembly, and the other end of which is hinged to the moving member of the power mechanism; The power mechanism controls the air outlet angle of the fan assembly; The fan assembly comprises: a casing, a fan installed in the casing; The power mechanism comprises: a screw nut assembly mounted on the unit housing, the screw nut assembly driving the moving part to move parallel to the front end of the unit housing; When the air outlet direction of the air outlet is perpendicular to the horizontal plane, the air outlet direction of the fan assembly is perpendicular to the horizontal plane; When the air outlet direction of the air outlet has an inclination angle relative to the horizontal plane and the air outlet is inclined toward the wind, the fan assembly rotates in a direction opposite to the inclination direction of the inclination angle under the action of the power mechanism and the connecting member, and the inclination angle is the angle at which the axial direction of the air outlet is inclined from the perpendicular to the horizontal plane to the front end of the unit casing.

2. The fan adjustment structure according to claim 1, characterized in that: Also includes: The displacement sensor installed on the housing of the unit is used to sense whether the moving position of the moving part has reached the displacement limit value.

3. The fan adjustment structure according to claim 1, characterized in that: The screw nut assembly and the fan are both driven by a stepper motor; The hinged member adopts a support rod, one end of which is fixedly mounted on the unit housing, and the other end of which is hinged to one end of the housing through a first hinge shaft; The connecting member is a connecting rod, one end of which is hinged to the other end of the housing through a second hinge shaft, and the other end of the connecting rod is hinged to the moving member through a third hinge shaft.

4. The fan adjustment structure according to claim 1, characterized in that: Also includes: A sealing ring provided between the air outlet and the housing; The regulating device further comprises: a driver connected to the motor of the fan assembly.

5. The fan adjustment structure according to claim 4, characterized in that: An air volume sensor is provided on the outside of the air outlet to detect the real-time exhaust volume Q of the fan assembly, and a controller is provided to adjust the air outlet angle of the fan assembly according to the real-time exhaust volume Q and the set exhaust volume Qa.

6. A refrigerated vehicle, comprising a vehicle body, an internal unit and an external unit respectively arranged inside and outside the vehicle body, characterized in that: The external unit adopts the fan adjustment structure as described in any one of claims 1 to 5, and the heat exchanger adopts a condenser.

7. A refrigerated vehicle control method, characterized in that: The refrigerated vehicle as claimed in claim 6 is used, comprising the following steps: The air volume sensor detects the real-time exhaust volume Q of the fan; The air outlet angle of the fan assembly is adjusted according to the real-time exhaust volume Q and the set exhaust volume Qa.

8. The refrigerated vehicle control method according to claim 7, characterized in that: Adjusting the air outlet angle of the fan assembly according to the real-time exhaust volume Q and the set exhaust volume Qa includes: Count the total time T during which the real-time exhaust volume Q is less than or equal to the set exhaust volume Qa; Determine whether the total duration T is greater than or equal to the critical duration T0; If yes, the power mechanism is controlled to drive the fan assembly to rotate so as to adjust the air outlet angle of the fan assembly; If not, return to continue detecting the real-time exhaust volume Q of the fan.

9. The refrigerated vehicle control method according to claim 8, characterized in that: If so, the power mechanism is controlled to drive the moving part to move upward, driving the fan assembly to rotate in a direction opposite to the tilt direction of the front end of the unit housing, and the air outlet direction of the fan rotates synchronously, and further includes: Recalculate the total time T during which the real-time exhaust volume Q is less than or equal to the set exhaust volume Qa; Determine whether the total duration T is greater than or equal to the critical duration T0; If yes, then return to control the power mechanism to drive the moving part to move upward; If not, the power mechanism is controlled to stop, and the process returns to continue detecting the real-time exhaust volume Q of the fan.

10. The refrigerated vehicle control method according to claim 9, characterized in that: If so, before returning to control the power mechanism to drive the moving part to move upward, the following step is also included: Determine whether the moving parts of the power mechanism have reached the displacement limit value; If yes, the power mechanism is controlled to stop, and based on the air volume difference between the set exhaust volume Qa and the real-time exhaust volume Q and the air outlet area S, the driver is controlled to adjust the operating frequency V of the fan; If not, the control power mechanism is returned to drive the moving part to move upward.

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