Heat dissipation control method of vehicle-mounted refrigerator

Abstract

The invention relates to the technical field of vehicle-mounted refrigerators, in particular to a heat dissipation control method of a vehicle-mounted refrigerator, which comprises a compressor bin, a compressor module and a control module are mounted in the compressor bin, an air inlet and an air outlet are formed in the compressor bin, a first fan is mounted at the air inlet, and a second fan is mounted at the air outlet. The first fan and the second fan are both in communication connection with the control module; the control method comprises the steps that when the compressor bin or the environment temperature rises to a certain temperature, the rotating speed of the second fan is larger than that of the first fan. By installing the first fan and the second fan, when the temperature of the compressor bin is high, the rotating speed of the second fan is larger than that of the first fan, the rotating speed of the air outlet side is higher, heat in the bin is rapidly discharged, and hot air deposition is avoided; the rotating speed of the air inlet side is slightly low, airflow turbulence in the bin caused by excessive inlet air can be avoided, wind resistance loss is reduced, a low-inlet and high-outlet airflow gradient is formed, air flow is smoother, heat exchange efficiency is more stable, and the service life of the fan is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle-mounted refrigerators, and particularly relates to a heat dissipation control method of a vehicle-mounted refrigerator. BACKGROUND

[0002] A patent with a publication number of CN118347232A disclosed by the same applicant of the present application discloses a direct-current fan control method and a control system of a vehicle-mounted refrigerator. The control method comprises the following steps: calculating a rotation speed standard range according to a rotation speed standard value and a tolerance value; obtaining a rotation speed calibration value; setting the rotation speed calibration value as the rotation speed standard value; detecting a compressor pipeline temperature; and when the detected temperature is greater than a first temperature threshold, setting a current rotation speed of the direct-current fan as [rotation speed calibration value*(output percentage+10%)]. The scheme firstly sets the rotation speed calibration value of the direct-current fan in the vehicle-mounted refrigerator in the rotation speed standard range. During the operation of the vehicle-mounted refrigerator, whether the rotation speed of the direct-current fan needs to be changed is determined by detecting the compressor pipeline temperature. When the compressor pipeline temperature is detected to be too high, the current rotation speed of the direct-current fan is set as [rotation speed calibration value*(output percentage+10%)], so as to improve the heat dissipation efficiency of the compressor.

[0003] The above technical scheme changes the rotation speed of a single fan to adapt to a high-temperature environment and improve the heat dissipation efficiency. However, in actual application, when the environmental temperature continuously increases, the airflow provided by the single fan system will reach an upper limit. Simply increasing the rotation speed of the single fan can increase the heat dissipation effect to a certain extent, but will cause the problem of shortening the service life of the fan.

[0004] Therefore, the heat dissipation effect of the above technical scheme still has room for improvement. SUMMARY

[0005] To solve the above technical problems, the purpose of the present application is to provide a heat dissipation control method of a vehicle-mounted refrigerator which can stably operate under high-temperature working conditions.

[0006] The technical scheme adopted by the present application to solve the problem is a heat dissipation control method of a vehicle-mounted refrigerator, comprising a compressor chamber, wherein a compressor module and a control module are installed in the compressor chamber, an air inlet and an air outlet are arranged on the compressor chamber, a first fan is installed at the air inlet, a second fan is installed at the air outlet, and the first fan and the second fan are in communication connection with the control module. The control method comprises the following steps: when the temperature of the compressor chamber or the environment increases to a certain temperature, the rotation speed of the second fan is greater than that of the first fan.

[0007] As a further improvement of the above technical scheme, a temperature sensor is further installed in the compressor chamber, the temperature sensor is in communication connection with the control module, and the temperature sensor is used to monitor the temperature in the compressor chamber.

[0008] As a further improvement of the above technical solution, the control method comprises the following steps: S1, the compressor module starts running, synchronously sends a speed controller start instruction to the control module, and shifts to step S2.

[0009] S2, after the speed controller receives the start instruction, the first fan runs at an initial basic speed N1, and the fan on the air outlet side runs at an initial target speed N2, and shifts to step S3.

[0010] S3, the temperature sensor collects the temperature T in the compressor compartment in real time, the speed controller has a preset low temperature threshold T1, a medium temperature threshold T2 and a high temperature threshold T3, T3>T2>T1, the speed controller judges whether T is lower than the preset low temperature threshold T1, if yes, the current speed is maintained, and shifts to step S7; if not, it shifts to step S4.

[0011] S4, the speed controller judges whether the temperature T in the compressor compartment is T1≤T

[0012] S5, the speed controller judges whether the temperature T in the compressor compartment is T2≤T

[0013] S6, when the temperature T in the compartment is T≥T3, the fan on the air inlet side runs at the rated upper limit speed, the fan on the air outlet side runs at the rated upper limit speed, and a high temperature warning signal is triggered at the same time, and shifts to step S7.

[0014] S7, the temperature change in the compressor compartment is continuously detected, if T decreases from higher than T1 to lower than T1-ΔT, the fan on the air inlet side returns to the initial basic speed N1, the fan on the air outlet side returns to the initial target speed N2, and stable operation is maintained; if the temperature continuously stays in the corresponding interval, the current speed is maintained, and steps S3-S7 are executed in a loop. As a further improvement of the above technical solution, in step S4, the ratio is that for every 1℃ increase of the temperature T in the compressor compartment, N1' increases by 3% of N1, and N2' increases by 4% of N2, to ensure that the speed of the fan on the air outlet side is higher than that of the fan on the air inlet side.

[0015] As a further improvement of the above technical solution, N1 is 1600-1800 rpm, and N2=N1×(1.2-1.3).

[0016] As a further improvement of the above technical solution, the low temperature threshold T1 is 75-85 DEG C, the medium temperature threshold T2 is 85-95 DEG C, and the high temperature threshold T3 is 95-105 DEG C.

[0017] As a further improvement of the above technical solution, in step S7, the DT is a cooling back difference, and the cooling back difference ranges from 5 to 8 DEG C.

[0018] As a further improvement of the above technical solution, the first fan rated upper limit speed is 1800-2000 rpm, and the second fan rated upper limit speed is 2000-2300 rpm.

[0019] As a further improvement of the above technical solution, the speed variation rate of the first fan and the second fan is not more than 50 rpm / s.

[0020] The present application has the following advantages: the present application installs the first fan and the second fan at the air inlet and the air outlet in the compressor chamber, when the compressor chamber or the ambient temperature is high, the speed of the second fan is greater than that of the first fan, the higher speed of the air outlet side can quickly remove the heat in the chamber, and the hot gas accumulation is avoided; the lower speed of the air inlet side can avoid excessive air inlet to cause airflow turbulence in the chamber, reduce wind resistance loss, form an airflow gradient of low inlet and high outlet, make the air flow more smooth, the heat exchange efficiency is more stable, and the service life of the fan is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further explained and described below in conjunction with the description of the drawings and the specific embodiments.

[0022] Fig. 1 is a structural sectional view of the present application; Fig. 2 is a schematic diagram of the overall structure of the present application; In the figure: 1 - compressor chamber, 11 - air inlet, 111 - first fan, 12 - air outlet, 121 - second fan, 2 - compressor module. DETAILED DESCRIPTION

[0023] This part will describe the specific embodiments of the present application in detail, the preferred embodiments of the present application are shown in the drawings, the drawings serve to supplement the description of the text part of the description, so that people can intuitively and visually understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0024] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application.

[0025] In the description of the present application, one or more is understood as one or more, more than two is understood as more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If the first, second is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0026] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0027] Reference Figs. 1-2 A heat dissipation control method of a vehicle-mounted refrigerator, comprising a compressor chamber 1, wherein a compressor module 2, a control module and a temperature sensor (positioned close to the heat dissipation end of the compressor) are installed in the compressor chamber 1, air inlets 11 and air outlets 12 are arranged on both sides of the compressor chamber 1, a first fan 111 is installed at the air inlet 11, a second fan 121 is installed at the air outlet 12, and the first fan 111, the second fan 121 and the temperature sensor are in communication connection with the control module; when the temperature sensor detects that the temperature of the compressor chamber 1 is relatively high, the rotating speed of the second fan 121 is greater than that of the first fan 111, and the higher rotating speed of the air outlet side can quickly remove the heat in the chamber, avoiding heat accumulation; the lower rotating speed of the air inlet side can avoid excessive air intake causing airflow turbulence in the chamber, reduce wind resistance loss, form an airflow gradient with low inlet and high outlet, make air flow more smooth, heat exchange efficiency more stable, and prolong the service life of the fan.

[0028] Specifically, in the preferred embodiment, the control method comprises the following steps: S1, the compressor module 2 starts to operate, synchronously sends a rotating speed controller starting instruction to the control module, and shifts to step S2; S2, after receiving the starting instruction, the rotating speed controller controls the first fan 111 to operate at an initial basic rotating speed N1, and controls the air outlet side fan to operate at an initial target rotating speed N2 (N2>N1), and shifts to step S3; S3, the temperature sensor collects the temperature T in the compressor chamber 1 in real time, the speed controller presets a low temperature threshold T1, a medium temperature threshold T2 and a high temperature threshold T3, T3>T2>T1, the speed controller judges whether T is lower than the preset low temperature threshold T1, if yes, the current speed is maintained, and the step S7 is transferred; if not, the step S4 is transferred; S4, the speed controller judges whether the temperature T in the compressor chamber 1 is in T1≤T<T2, if yes, the speed of the air inlet side is increased to N1' and the speed of the air outlet side is increased to N2' by a certain proportion, and N2'-N1'>N2-N1, and the step S7 is transferred; if not, the step S5 is transferred; S5, the speed controller judges whether the temperature T in the compressor chamber 1 is in T2≤T<T3, if yes, the speed of the air inlet side is increased to 80% of the rated upper limit speed (N1_max80%) and the speed of the air outlet side is increased to 90% of the rated upper limit speed (N2_max90%), and the step S7 is transferred; if not, the step S6 is transferred; S6, when the temperature T in the chamber is T≥T3, the fan of the air inlet side operates at the rated upper limit speed N1_max, the fan of the air outlet side operates at the rated upper limit speed N2_max, and a high temperature early warning signal is triggered, and the step S7 is transferred; S7, the temperature change in the compressor chamber 1 is continuously detected, if T decreases from higher than T1 to lower than T1-ΔT (ΔT is the temperature drop hysteresis), the fan of the air inlet side returns to the initial basic speed N1, the fan of the air outlet side returns to the initial target speed N2, and stable operation is maintained; if the temperature continuously stays in the corresponding interval, the current speed is maintained, and the steps S3-S7 are executed in a loop. In the preferred embodiment, in the step S4, the proportion is that: for every 1℃ increase of the temperature T in the compressor chamber 1, N1' is increased by 3% of N1 and N2' is increased by 4% of N2, ensuring that the speed of the second fan 121 is increased higher than that of the first fan 111. In some embodiments, the N1 is 1600-1800 rpm, and the N2=N1×(1.2-1.3), that is, the initial speed of the second fan 121 is 20%-30% higher than that of the air inlet side. In some embodiments, the low temperature threshold T1 is 75-85℃, the medium temperature threshold T2 is 85-95℃, and the high temperature threshold T3 is 95-105℃.

[0029] In some embodiments, in the step S7, the range of the ΔT is 5-8℃.

[0030] In some embodiments, the rated upper limit speed N1_max of the first fan 111 is 1800-2000 rpm, and the rated upper limit speed N2_max of the second fan 121 is 2000-2300 rpm, and the specific speed can be adapted to different chamber specifications.

[0031] In a preferred embodiment, the rotational speed change rate of the first fan 111 and the second fan 121 does not exceed 50 rpm / s, and the speed adjustment process adopts a smooth transition mode to avoid wind resistance impact caused by sudden airflow changes.

[0032] In a preferred embodiment, the high temperature warning signal is an audible and visual alarm or a remote communication alarm, which continues until the temperature drops below T3.

[0033] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct or indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A heat dissipation control method for a vehicle-mounted refrigerator, comprising a compressor compartment (1), wherein a compressor module (2) and a control module are installed in the compressor compartment (1), and an air inlet (11) and an air outlet (12) are provided on the compressor compartment (1), characterized in that: A first fan (111) is installed at the air inlet (11), and a second fan (121) is installed at the air outlet (12). Both the first fan (111) and the second fan (121) are communicatively connected to the control module. The control method includes: when the temperature of the compressor compartment (1) or the ambient temperature rises to a certain temperature, the speed of the second fan (121) is greater than the speed of the first fan (111).

2. The heat dissipation control method for a vehicle-mounted refrigerator as described in claim 1, characterized in that: A temperature sensor is also installed inside the compressor compartment (1). The temperature sensor is connected to the control module and is used to monitor the temperature inside the compressor compartment (1).

3. The heat dissipation control method for a vehicle-mounted refrigerator as described in claim 2, characterized in that, The control method includes the following steps: S1. The compressor module (2) starts running and synchronously sends a speed controller start command to the control module, then proceeds to step S2; S2. After receiving the start command, the speed controller controls the first fan (111) to run at the initial base speed N1 and the exhaust fan to run at the initial target speed N2, and then proceeds to step S3. S3. The temperature sensor collects the temperature T inside the compressor compartment (1) in real time. The speed controller has preset low temperature threshold T1, medium temperature threshold T2 and high temperature threshold T3. T3 > T2 > T1. The speed controller determines whether T is lower than the preset low temperature threshold T1. If so, it maintains the current speed and moves to step S7; otherwise, it moves to step S4. S4. The speed controller determines whether the temperature T inside the compressor compartment (1) is T1≤T<T2. If so, the speed of the air inlet side is increased to N1' and the speed of the air outlet side is increased to N2' by a certain ratio, and N2'-N1'>N2-N1. Then, the process moves to step S7. Otherwise, the process moves to step S5. S5. The speed controller determines whether the temperature T inside the compressor compartment (1) is T2≤T<T3. If so, the speed on the air inlet side is increased to 75-85% of the rated upper limit speed and the speed on the air outlet side is increased to 85-95% of the rated upper limit speed. Then, the process proceeds to step S7. Otherwise, the process proceeds to step S6. S6. When the temperature inside the chamber T≥T3, the inlet fan operates at the rated upper limit speed and the outlet fan operates at the rated upper limit speed. At the same time, a high temperature warning signal is triggered, and the process proceeds to step S7. S7. Continuously monitor the temperature change inside the compressor compartment (1). If T drops from above T1 to below T1-ΔT, the inlet fan will return to the initial base speed N1 and the outlet fan will return to the initial target speed N2, maintaining stable operation. If the temperature remains in the corresponding range, maintain the current speed and repeat steps S3-S7.

4. The heat dissipation control method for a vehicle-mounted refrigerator as described in claim 3, characterized in that: In step S4, the ratio is as follows: for every 1°C increase in temperature T inside the compressor compartment (1), N1' increases by 3% and N2' increases by 4% to ensure that the speed increase on the air outlet side is higher than that on the air inlet side.

5. The heat dissipation control method for a vehicle-mounted refrigerator as described in claim 3, characterized in that: N1 is 1600-1800 rpm, and N2 = N1 × (1.2-1.3).

6. The heat dissipation control method for a vehicle-mounted refrigerator as described in claim 3, characterized in that: The low temperature threshold T1 is 75-85℃, the medium temperature threshold T2 is 85-95℃, and the high temperature threshold T3 is 95-105℃.

7. The heat dissipation control method for a vehicle-mounted refrigerator as described in claim 3, characterized in that: In step S7, ΔT is the cooling hysteresis, and the cooling hysteresis ranges from 5 to 8°C.

8. The heat dissipation control method for a vehicle-mounted refrigerator as described in claim 3, characterized in that: The first fan (111) has a rated upper limit speed of 1800-2000 rpm, and the second fan (121) has a rated upper limit speed of 2000-2300 rpm.

9. The heat dissipation control method for a vehicle-mounted refrigerator as described in claim 3, characterized in that: The rotational speed of the first fan (111) and the second fan (121) does not exceed 50 rpm / s.

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