A low-voltage power cabinet with autonomous safety protection and heat dissipation control method

Abstract

The present invention discloses a low-voltage power cabinet with autonomous safety protection and a heat dissipation control method, which relate to the technical field of low-voltage power cabinets. This scheme aims at the high-temperature protection process of the low-voltage power cabinet, and uses a temperature sensor as an inspection element to detect the internal ambient temperature of the cabinet. The difference lies in: using a ventilation fan that does not actively participate in the heat dissipation process to cause the hot air inside the cabinet to be in a top-to-bottom circulation mode, the purpose of which is to be able to "comprehensively" detect the internal ambient temperature of the cabinet, which is specifically reflected in the first-order balance coefficient, and is optimized and improved with the first-order balance coefficient. According to the fluctuation state of the temperature values ​​in multiple temperature sensors, a calculation method of the second-order balance coefficient is formed, so that the air volume of the ventilation fan and the air supply fan per unit time can be readjusted, and on the basis of maintaining normal heat dissipation, a "correlated" heat dissipation control method is adopted.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage power cabinets, and in particular to a low-voltage power cabinet with autonomous safety protection and a heat dissipation control method. Background Art

[0002] High temperature protection is one of the protective measures in low-voltage power cabinets. The current heat dissipation method uses natural convection or forced convection to dissipate heat to ensure that the equipment operates within a normal temperature range, such as natural air cooling, forced air cooling (fan), water cooling or condensation heat dissipation. It is manifested as: autonomous control through structures such as fans and temperature sensors. Please refer to the technical solution disclosed in Publication No. CN114122987A.

[0003] However, it should be noted that the operating environment temperature inside the power cabinet fluctuates according to its own operating power. Especially for outdoor power cabinets, the external environment temperature will also have a great impact on the internal environment temperature of the power cabinet. If a temperature sensor is used as the main body, it is difficult to feedback the temperature fluctuation status in advance. For example, the temperature in a certain period of time has caused damage to the precision components inside the power cabinet. Then it can be understood that the current high-temperature protection has insufficient / excess processing capacity for the heat dissipation structure (fan) therein and has great limitations. For this purpose, the present application proposes a solution. Summary of the invention

[0004] The purpose of the present invention is to provide a low-voltage power cabinet with autonomous safety protection and a heat dissipation control method, which is used to solve the problems of insufficient / excess processing capacity and large limitations in the high-temperature protection measures in the current low-voltage power cabinets, which is specifically manifested as: it is difficult to fully control the internal ambient temperature of the power cabinet.

[0005] The object of the present invention can be achieved by the following technical scheme: A low-voltage power cabinet with autonomous safety protection, comprising a cabinet body, an inner sleeve is installed inside the cabinet body, and a circulation groove and an installation cavity are arranged inside the cabinet body through the inner sleeve, the circulation groove is respectively arranged as an upper cavity, a lower cavity, a left cavity and a right cavity along the cross-sectional direction of the inner sleeve, and an air port is opened on the outer wall position of the circulation groove corresponding to the left cavity and the right cavity, and a controller, an air supply fan and a ventilation fan are installed in the installation cavity;

[0006] The ventilation fan is equipped with a ventilation pipe, which is connected to the upper cavity and the lower cavity in the circulating groove respectively. The air supply fan is equipped with an air supply pipe, one end of which is connected to the upper cavity and the other end of which extends to the outside of the cabinet.

[0007] It is further configured as follows: a plurality of vertically arranged diverter bars are installed on the outer wall positions of the inner casing sleeve corresponding to the left cavity and the right cavity, and a plurality of temperature sensors are installed in the diverter bars.

[0008] It is further configured that: a plurality of the temperature sensors are arranged equidistantly along the vertical direction, and the diverter bars are arranged to correspond to the air ports.

[0009] It is further configured as follows: one of the ventilation pipes corresponding to the lower cavity extends to a position outside the cabinet, and an external air pipe is installed at the position of the ventilation pipe corresponding to the lower cavity.

[0010] It is further configured as follows: a cross section of the inner sleeve corresponding to the upper cavity is in a downwardly curved arc shape.

[0011] A heat dissipation control method for a low-voltage power cabinet with autonomous safety protection, and an operation and maintenance system is set through a controller. The operation and maintenance system includes a parameter input unit, a parameter analysis unit and a hierarchical action unit. The operation process includes the following parts:

[0012] The parameter input unit is used to collect the basic parameters in the temperature sensor and the action parameters of the ventilation fan and the air supply fan. The basic parameters include the temperature value and position data in the temperature sensor, and input the basic parameters and the action parameters into the parameter analysis unit;

[0013] In the parameter analysis unit, a first-order temperature model is formed with temperature values ​​and action parameters, a first-order balance coefficient is calculated in the first-order temperature model, and the position data is substituted into the first-order temperature model, a second-order balance coefficient is calculated based on the first-order balance coefficient, and the first-order balance coefficient and the second-order balance coefficient are input into the hierarchical action unit;

[0014] The hierarchical action unit has the control authority over the ventilation fan and the air supply fan, and uses the second-order balance coefficient as a judgment indicator and the first-order balance coefficient as a basis to readjust the action parameters in the ventilation fan or the air supply fan.

[0015] It is further set as follows: each temperature sensor is numbered as i from top to bottom, i is a positive integer, and the action parameters are respectively represented by the operating power of the ventilation fan and the air supply fan, and are respectively represented by To express, and It is mainly manifested as the air volume of the ventilation fan and the air supply fan per unit time. The calculation method of the first-order balance coefficient is: X is used to represent the first-order balance coefficient. The temperature value in the temperature sensor at each position is set to Ti, and the upper temperature limit To inside the cabinet is preset in the parameter analysis unit. During the continuous flow of hot air, the temperature value in each temperature sensor is directly obtained, such as T1, T2...Ti-1, Ti, and multiple temperature values ​​are directly entered into the first-order temperature model. The maximum value of the temperature value is retrieved in the first-order temperature model. When X<0, it indicates that the ambient temperature inside the cabinet is in a normal state. When X>0, it indicates that the ambient temperature inside the cabinet is in an abnormal state. The following actions are set through the hierarchical action unit:

[0016] S1: The ventilation fan maintains the circulation process of the hot air in the upper and lower chambers, and the circulation direction is always maintained from top to bottom. When X is less than 0, the ventilation fan maintains the initial state and operates normally, while the air supply fan is in the state of interrupted operation.

[0017] S2: When X>0, obtain multiple temperature values ​​and recalculate the optimized first-order balance coefficient according to the calculation method of the first-order balance coefficient, and use X i It is expressed and the calculation method related to the second-order balance coefficient is established: M = (X i / X i-1 )·(X i-1 / X i-2 )...(X i-n / X i-n-1 ), where n is a positive integer, according to the second-order equilibrium coefficient Optimize and form or The air volume conversion method is as follows, where k is the error value and is a constant factor.

[0018] The present invention has the following beneficial effects:

[0019] 1. This solution is aimed at the high temperature protection process in low-voltage power cabinets. It is based on the conventional method of using temperature sensors as detection means and ventilation as heat dissipation means. The difference is that the ventilation fan drives the hot air inside the cabinet to circulate from top to bottom. The purpose is to promote the uniform distribution of hot air inside the cabinet, so that the changes in the internal environment of the cabinet can be "comprehensively" detected. Specifically, the first-order balance coefficient obtained by the calculation method of the first-order balance coefficient is used as the judgment standard;

[0020] 2. In combination with the above content, the second-order balance coefficient is optimized based on the first-order balance coefficient. The second-order balance coefficient is the correlation between each group of temperature values. On the basis of "comprehensive" detection of changes in the internal ambient temperature of the cabinet, a more detailed temperature fluctuation state is obtained, so that the ventilation fan and air supply action are adjusted in detail with the second-order balance coefficient. The purpose is: on the basis of maintaining normal heat dissipation, unified planning is carried out in the form of "early warning" and "correlation" to avoid problems of overcapacity or undercapacity of ventilation fans and air supply actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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 work.

[0022] Figure 1 This is a schematic diagram of the structure of a low-voltage power cabinet with autonomous safety protection proposed by the present invention;

[0023] Figure 2 A cross-sectional view of a cabinet in a low-voltage power cabinet with autonomous safety protection proposed by the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of an inner sleeve in a low-voltage power cabinet with autonomous safety protection proposed by the present invention;

[0025] Figure 4 A low-voltage power cabinet with autonomous safety protection proposed by the present invention Figure 1 A cross-sectional view of

[0026] Figure 5 A side view of an inner sleeve in a low-voltage power cabinet with autonomous safety protection proposed by the present invention;

[0027] Figure 6 This is a schematic diagram of the operation of a heat dissipation control method for a low-voltage power cabinet with autonomous safety protection proposed by the present invention.

[0028] In the figure: 1. cabinet; 101. circulation trough; 102. installation cavity; 2. inner sleeve; 3. diversion grid; 4. temperature sensor; 5. ventilation pipe; 6. controller; 7. air supply fan; 8. ventilation fan; 9. external air pipe; 10. air supply pipe. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1

[0031] For the high temperature protection method in the low-voltage power cabinet, its essence is to use the detection parameters of the temperature sensor to perform forced air cooling and cooperate with the heat dissipation method of natural convection. However, due to the difference in operating power inside the cabinet, the internal ambient temperature is different. Conventional forced air cooling or natural convection methods are difficult to meet the heat dissipation protection requirements. The following technical solutions are proposed:

[0032] Reference Figures 1 to 5 In this embodiment, a low-voltage power cabinet with autonomous safety protection includes a cabinet body 1, an inner sleeve 2 is installed inside the cabinet body 1, and a circulation groove 101 and an installation cavity 102 are arranged inside the cabinet body 1 through the inner sleeve 2, and the circulation groove 101 is respectively arranged as an upper cavity, a lower cavity, a left cavity and a right cavity along the cross-sectional direction of the inner sleeve 2, and an air port is opened on the outer wall position of the circulation groove 101 corresponding to the left cavity and the right cavity, and a controller 6, an air supply fan 7 and a ventilation fan 8 are installed in the installation cavity 102;

[0033] A ventilation pipe 5 is installed on the ventilation fan 8, and the ventilation pipe 5 is connected to the upper cavity and the lower cavity in the circulating groove 101 respectively. An air supply pipe 10 is installed on the air supply fan 7. One end of the air supply pipe 10 is connected to the upper cavity, and the other end of the air supply pipe 10 extends to the outside of the cabinet 1. A plurality of vertically arranged diverter bars 3 are installed on the outer wall positions of the inner shell 2 corresponding to the left cavity and the right cavity. A plurality of temperature sensors 4 are installed in the diverter bars 3. The plurality of temperature sensors 4 are equidistantly arranged along the vertical direction. The diverter bars 3 are arranged to correspond to the air ports, and one of the ventilation pipes 5 corresponding to the lower cavity extends to the external position of the cabinet 1, and an external air pipe 9 is installed on the ventilation pipe 5 corresponding to the lower cavity. The cross section of the inner shell 2 corresponding to the upper cavity is in the shape of a downward curved arc.

[0034] Basic principle: Refer to Figure 2 For example, by installing the inner sleeve 2 inside the cabinet 1, the inner sleeve 2 is used as the installation position of the electrical components, and the outer portion of the inner sleeve 2 and the inner portion of the cabinet 1 form a mutually isolated circulation groove 101 and an installation cavity 102, the circulation groove 101 is mainly used as a flow channel for hot air, and the installation cavity 102 is not affected by the hot air and serves as the installation position of the air supply fan 7 and the ventilation fan 8;

[0035] First of all, it should be explained that after the corresponding electrical components are installed in the inner sleeve 2 and put into operation, hot air begins to accumulate in the inner sleeve 2, and according to the principle that hot air floats, the hot air is concentrated at the upper end of the inner sleeve 2, and can also be carried into the circulation groove 101 through the air port, combined with Figure 4 To explain: the hot air is finally concentrated in the upper cavity. Therefore, in this embodiment, it is necessary to limit the cross section of the inner sleeve 2 corresponding to the upper cavity, so that the hot air enters the upper cavity along the inner upper curved surface of the inner sleeve 2 and "accumulates and stays" in the upper cavity.

[0036] The ventilation fan 8 is not the main body of the heat dissipation structure, but a hot air guide structure. Specifically, the ventilation fan 8 promotes the hot air to flow continuously in the circulation groove 101, and draws the hot air in the upper cavity into the lower cavity. Specifically, it uses the principle of hot air floating. Its purpose is to make the hot air flow continuously, so that the temperature sensor 4 can detect the temperature change inside the cabinet 1 in a "comprehensive" manner.

[0037] The air supply fan 7 generates a strong airflow and blows it into the upper cavity from top to bottom. The purpose is to "drive" the hot air in the upper cavity again and increase the fluidity of the hot air. During the hot air flow, it is necessary to add diverter bars 3 on the left and right cavities to guide the hot air.

[0038] The essence of this embodiment is to use the temperature of continuously circulating hot air as a detection standard to form a "comprehensive" heat dissipation method, thereby avoiding the problem of heat concentration and inability to dissipate heat in conventional heat dissipation methods.

[0039] Embodiment 2

[0040] This embodiment is based on the first embodiment and proposes the following solution optimization:

[0041] Reference Figure 6 In this embodiment, a heat dissipation control method of a low-voltage power cabinet with autonomous safety protection is provided. The operation and maintenance system is set by the controller 6. The operation and maintenance system includes a parameter input unit, a parameter analysis unit and a hierarchical action unit. The operation process includes the following parts:

[0042] The parameter input unit is used to collect the basic parameters in the temperature sensor 4 and the action parameters of the ventilation fan 8 and the air supply fan 7. The basic parameters include the temperature value and position data in the temperature sensor 4, and input the basic parameters and the action parameters into the parameter analysis unit;

[0043] In the parameter analysis unit, a first-order temperature model is formed with temperature values ​​and action parameters, a first-order balance coefficient is calculated in the first-order temperature model, and the position data is substituted into the first-order temperature model, a second-order balance coefficient is calculated based on the first-order balance coefficient, and the first-order balance coefficient and the second-order balance coefficient are input into the hierarchical action unit;

[0044] The hierarchical action unit has control authority over the ventilation fan 8 and the air supply fan 7, and uses the second-order balance coefficient as a judgment indicator and the first-order balance coefficient as a basis to readjust the action parameters in the ventilation fan 8 or the air supply fan 7.

[0045] Solution description: For the position data in the basic parameters, it is mainly used to indicate the installation height of each temperature sensor 4, and is numbered as i from top to bottom, where i is a positive integer, and the action parameters are respectively represented by the operating power of the ventilation fan 8 and the air supply fan 7, and are respectively expressed as To express, and It is mainly manifested as the air volume of the ventilation fan 8 and the air supply fan 7 per unit time, specifically the air extraction volume of the external air pipe 9 and the air supply volume of the air supply pipe 10. Then, the temperature value of the temperature sensor 4 at each position is set to T i , and preset the upper temperature limit T inside cabinet 1 in the parameter analysis unit o , during the continuous flow of hot air, directly obtain the temperature value of each temperature sensor 4, such as T 1 , T 2 …T i-1 , T i , and directly input multiple temperature values ​​into the first-order temperature model, and retrieve the maximum value of the temperature value in the first-order temperature model The first-order equilibrium coefficient is expressed as X is used to represent the first-order balance coefficient, so it can be understood that: when X<0, it means that the ambient temperature inside the cabinet 1 is in a normal state; conversely, when X>0, it means that the ambient temperature inside the cabinet 1 is in an abnormal state;

[0046] With reference to the above X, the ambient temperature inside the cabinet 1 can be directly fed back. In this process, the first-order balance coefficient can be used as an action parameter associated with the ventilation fan 8 and the air supply fan 7 in the graded action unit.

[0047] Embodiment 3

[0048] Based on the second embodiment and combined with the first embodiment, the following supplementary explanation is provided:

[0049] In combination with the first and second embodiments, the following action process is set:

[0050] S1: The ventilation fan 8 maintains the circulation process of the hot air in the upper and lower chambers, and the circulation direction is always maintained from top to bottom. When X<0 in the ventilation fan 8, the ventilation fan 8 maintains the initial state and operates normally, while the air supply fan 7 is in the state of interrupted operation. and is a fixed value, and the external air pipe 9 is in a closed state;

[0051] S2: In the state of X>0, a readjustment action is required. Specifically, the ventilation fan 8 is connected to the external air pipe 9 on the basis of ensuring the circulation of hot air to ensure that part of the hot air is discharged, and the air supply fan 7 is started to extract an equal amount of cold air into the circulation groove 101;

[0052] The process combined with S1 and S2 explains the hierarchical action unit:

[0053] S1-1: When X is less than 0, the calculation process of the second-order balance coefficient is not performed, so the ventilation fan 8 and the air supply fan 7 inside the cabinet 1 maintain the operation process of S1;

[0054] S2-1: When X>0, the calculation process of the first-order balance coefficient is used as the basis, but the difference is that the maximum value of multiple temperature values ​​is no longer called, but multiple temperature values ​​are directly obtained and the optimized first-order balance coefficient is calculated again according to the calculation method of the first-order balance coefficient, and X is used as the basis. i It is expressed and established in relation to the calculation method of the second-order balance coefficient: M = (X i / X i-1 )·(X i-1 / X i-2 )...(X i-n / X i-n-1 ), where n is a positive integer. Specifically, because the hot air maintains a circulation mode from bottom to top, the temperature value of the temperature sensor 4 at the number i-1 "indirectly affects" the temperature value of the temperature sensor 4 at the number i, and multiple groups (X i / X i -1 ), specifically the difference between the temperature values ​​of the temperature sensors 4 in two adjacent positions, combined with The calculation method of (T i -T o ) / T o ,(T i-1 -T o ) / T o The calculation method is as follows: (T i -T o ) / T o ,(T i-1 -T o ) / T o The difference in , so we can get M = | (T i -T o ) / T o -(T i-1 -T o ) / T o |Calculation method;

[0055] S2-2: Combined with S2-1, the temperature fluctuation state of the temperature sensor 4 in two adjacent positions is obtained, where M is used to represent the second-order balance coefficient, and the error value is set to k in the second-order balance coefficient, where k is a constant factor and is a positive value, and the following two groups of methods are further optimized:

[0056] A: After calculating M and taking its absolute value, when M<k, the air supply fan 7 and the ventilation fan 8 are started at the same time, but the air volume relationship between the two is set to: Then it can be understood that: the air supply fan 7 performs air supply action on the circulation groove 101, and the air supply amount in the air supply action is greater than the hot air extracted by the ventilation fan 8;

[0057] B: When M>k, the process returns to S2-1 again, but the difference is that it does not use the temperature sensors 4 in two adjacent positions as a basis, but directly retrieves the maximum and minimum values ​​of multiple sets of temperature values, and calculates M=|(T max -T o ) / T o -(T min -T o ) / T o | is again optimized M, so that the air supply fan 7 and the ventilation fan 8 are started at the same time, but the air volume relationship between the two is again optimized as follows:

[0058] In summary: For the high temperature protection process of the low-voltage power cabinet, the temperature sensor is used as the inspection element to detect the internal ambient temperature of the cabinet. The difference is that the ventilation fan that does not actively participate in the heat dissipation process is used to cause the hot air inside the cabinet to circulate from top to bottom. The purpose is to "comprehensively" detect the internal ambient temperature of the cabinet, which is specifically reflected in the first-order balance coefficient. The first-order balance coefficient is optimized and improved, and the calculation method of the second-order balance coefficient is formed according to the fluctuation state of the temperature values ​​in multiple temperature sensors. Therefore, the air volume of the ventilation fan and the air supply fan per unit time can be readjusted. On the basis of maintaining normal heat dissipation, a "correlated" heat dissipation control method is adopted.

[0059] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A heat dissipation control method for a low-voltage power cabinet with autonomous safety protection, the low-voltage power cabinet comprising a cabinet body (1), characterized in that: An inner shell (2) is installed inside the cabinet (1), and a circulation groove (101) and an installation cavity (102) are arranged inside the cabinet (1) through the inner shell (2), the circulation groove (101) is arranged as an upper cavity, a lower cavity, a left cavity and a right cavity along the cross-sectional direction of the inner shell (2), and air ports are opened on the outer wall positions of the circulation groove (101) corresponding to the left cavity and the right cavity, and a controller (6), an air supply fan (7) and a ventilation fan (8) are installed in the installation cavity (102); The ventilation fan (8) is provided with a ventilation pipe (5), the ventilation pipe (5) being connected to the upper cavity and the lower cavity in the circulation groove (101) respectively; the air supply fan (7) is provided with an air supply pipe (10), one end of the air supply pipe (10) being connected to the upper cavity, and the other end of the air supply pipe (10) extending to the outside of the cabinet (1); a plurality of vertically arranged diverter bars (3) are provided on the outer wall positions of the inner tank sleeve (2) corresponding to the left cavity and the right cavity, and a plurality of temperature sensors (4) are provided in the diverter bars (3); The operation and maintenance system is set up through the controller (6), and the operation and maintenance system includes a parameter input unit, a parameter analysis unit and a hierarchical action unit. The operation process includes the following parts: The parameter input unit is used to collect basic parameters in the temperature sensor (4) and action parameters of the ventilation fan (8) and the air supply fan (7), wherein the basic parameters include the temperature value and position data in the temperature sensor (4), and input the basic parameters and action parameters into the parameter analysis unit; In the parameter analysis unit, a first-order temperature model is formed with temperature values ​​and action parameters, a first-order balance coefficient is calculated in the first-order temperature model, and the position data is substituted into the first-order temperature model, a second-order balance coefficient is calculated based on the first-order balance coefficient, and the first-order balance coefficient and the second-order balance coefficient are input into the hierarchical action unit; The hierarchical action unit has control authority over the ventilation fan (8) and the air supply fan (7), and uses the second-order balance coefficient as a judgment index and the first-order balance coefficient as a basis to readjust the action parameters in the ventilation fan (8) or the air supply fan (7); Each temperature sensor (4) is numbered i from top to bottom, i is a positive integer, and the action parameters are respectively represented by the operating power of the ventilation fan (8) and the air supply fan (7), and are respectively represented by To express, and It is mainly represented by the air volume of the ventilation fan (8) and the air supply fan (7) per unit time. The calculation method of the first-order balance coefficient is: X is used to represent the first-order equilibrium coefficient, and the temperature value in the temperature sensor (4) at each position is set to T i , and preset the upper temperature limit T inside the cabinet (1) in the parameter analysis unit o , while the hot air continues to flow, the temperature value of each temperature sensor (4) is directly obtained, as T 1 、T 2 …T i-1 、T i Represent and directly enter multiple temperature values ​​into the first-order temperature model, and retrieve the maximum value of the temperature value in the first-order temperature model When X<0, it indicates that the ambient temperature inside the cabinet (1) is in a normal state. When X>0, it indicates that the ambient temperature inside the cabinet (1) is in an abnormal state. The following actions are set through the hierarchical action unit: S1: the ventilation fan (8) maintains the circulation process of the hot air in the upper chamber and the lower chamber, the circulation direction is always maintained from top to bottom, and the ventilation fan (8) is in the state of X<0, the ventilation fan (8) maintains the initial state of normal operation, and the air supply fan (7) is in the state of interrupted operation; S2: When X>0, obtain multiple temperature values ​​and recalculate the optimized first-order balance coefficient according to the calculation method of the first-order balance coefficient, and use X i It is expressed and the calculation method related to the second-order balance coefficient M is established: M = (X i / X i-1 )·(X i-1 / X i-2 )...(X i-n / X i-n-1 ), where n is a positive integer, according to the second-order balance coefficient Optimize and form or The air volume conversion method is as follows, where k is the error value and is a constant factor.

2. A heat dissipation control method for a low-voltage power cabinet with autonomous safety protection according to claim 1, characterized in that: The plurality of temperature sensors (4) are arranged at equal intervals in the vertical direction, and the diverter bars (3) are arranged to correspond to the air ports.

3. The heat dissipation control method of a low-voltage power cabinet with autonomous safety protection according to claim 1 is characterized in that: One of the ventilation pipes (5) corresponding to the lower chamber extends to a position outside the cabinet (1), and an external air pipe (9) is installed at the position of the ventilation pipe (5) corresponding to the lower chamber.

4. The heat dissipation control method of a low-voltage power cabinet with autonomous safety protection according to claim 1 is characterized in that: The cross section of the inner liner sleeve (2) corresponding to the upper cavity is in the shape of a downwardly curved arc.

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