A method for detecting fan failure

Abstract

The invention discloses a fan fault detection method. According to an air volume and flow rate judgment strategy, two points with different air volume and flow rates on a power electronic device are found, which are air volume and flow rate point one and air volume and flow rate point two, the air volume and flow rate of the air volume and flow rate point one is V1, the air volume and flow rate of the air volume and flow rate point two is V2, and V1≠V2; the air volume and flow rate point one is provided with a first air pressure sensor, and the air volume and flow rate point two is provided with a second air pressure sensor; the wind pressure P1 of the air volume and flow rate point one is detected by the first air pressure sensor, and the wind pressure P2 of the air volume and flow rate point two is detected by the second air pressure sensor; if the wind pressure P1 of the air volume and flow rate point one is equal to the wind pressure P2 of the air volume and flow rate point two, it is judged that a fan operation fault occurs according to the air volume and flow rate and wind pressure conversion strategy; the method can detect the operation status of the fan in real time at a certain distance from the fan outlet, is not affected by temperature and altitude, is simple to set up, does not contact the fan itself during detection, and has low cost.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a method for detecting fan faults. Background Art

[0002] In recent years, with the continuous development of the power electronics industry, the power of power electronic equipment has become increasingly powerful, and the heat generated has also become increasingly larger. In the air cooling equipment used in power electronic equipment, a device that can detect the fan status in real time is needed;

[0003] In the traditional fan status detection device, only the fan speed can be obtained through the fan feedback signal when the fan is running, and the fan status cannot be detected in real time at a certain distance from the fan outlet. The existing fan detection system also cannot detect the wind pressure;

[0004] See also Figure 1 , Chinese utility model patent CN214791781U, discloses a fan fault detection system, wherein a speed monitoring device is arranged on one side of a fan blade to measure the speed of the fan blade, and a current monitoring device is arranged on the loop circuit of the fan to measure the loop current of the fan; the fan fault detection system directly collects the flow at the air outlet and directly measures the fan speed, but this monitoring can only be limited to the fan itself, and it is impossible to monitor the fan status in real time at a certain distance outside the fan. If the fan is a relatively large fan, a large detection device matching it must also be used to monitor the air volume at the outlet, which is costly;

[0005] If the fan fails and the air output is insufficient, the heat dissipation of the power electronic equipment will be greatly affected, which may easily cause the power devices in the power electronic equipment that need heat dissipation to be affected and damaged. Summary of the invention

[0006] The technical problem to be solved by the present invention is to propose a fan fault detection method, which can solve the problem that the existing fan detection system cannot detect the wind pressure. Through the fan detection method, the operating status of the fan can be detected in real time at a certain distance from the fan outlet. It is not affected by temperature and altitude, has a simple setting, does not contact the fan itself during detection, and has low cost.

[0007] To solve the above technical problems, the present invention provides a fan fault detection method, and provides a power electronic device, wherein the air outlet of the fan faces the power electronic device, and the method comprises the following steps: according to the air volume flow rate judgment strategy, two points with different air volume flow rates on the power electronic device are found, which are air volume flow rate point 1 and air volume flow rate point 2, respectively, the air volume flow rate of the air volume flow rate point 1 is V1, the air volume flow rate of the air volume flow rate point 2 is V2, and V1≠V2;

[0008] The first air volume velocity point is provided with a first air pressure sensor, and the second air volume velocity point is provided with a second air pressure sensor;

[0009] The wind pressure P1 at the wind volume and velocity point 1 is detected by the first air pressure sensor, and the wind pressure P2 at the wind volume and velocity point 2 is detected by the second air pressure sensor;

[0010] If the wind pressure P1 at wind speed point 1 is not equal to the wind pressure P2 at wind speed point 2, the fan is judged to be operating normally according to the wind speed and wind pressure conversion strategy;

[0011] If the wind pressure P1 at the wind volume velocity point 1 is equal to the wind pressure P2 at the wind volume velocity point 2, it is determined that a fan operation failure occurs according to the wind volume velocity and wind pressure conversion strategy.

[0012] Preferably, the power electronic device is a printed circuit board.

[0013] Preferably, the wind volume and flow rate judgment strategy is as follows: the wind volume and flow rate point one is set on the upper surface of the printed circuit board, and the wind volume and flow rate point two is set on the lower surface of the printed circuit board; along the wind direction of the fan outlet, the path length from the starting point of the upper surface of the printed circuit board to the wind volume and flow rate point one is L1, and the path length from the starting point of the lower surface of the printed circuit board to the wind volume and flow rate point two is L2; ​​if L1≠L2, it is judged that the wind volume and flow rate V1 of the wind volume and flow rate point one is not equal to the wind volume and flow rate V2 of the wind volume and flow rate point two, and the wind volume and flow rate point one and the wind volume and flow rate point two are the wind volume and flow rate points to be found by the fan fault detection method.

[0014] Preferably, the wind volume and flow rate judgment strategy is as follows: the plane where the printed circuit board is located forms a fixed angle θ with the wind direction of the fan outlet; the wind volume and flow rate point one is set on the upper surface of the printed circuit board, and the wind volume and flow rate point two is set on the lower surface of the printed circuit board, and it is judged that the wind volume and flow rate V1 of the wind volume and flow rate point one is not equal to the wind volume and flow rate V2 of the wind volume and flow rate point two, and the wind volume and flow rate point one and the wind volume and flow rate point two are the wind volume and flow rate points to be found by the fan fault detection method.

[0015] Preferably, a comparison operation module is also provided; the step of "detecting the wind pressure P1 at the wind volume flow rate point 1 by the first air pressure sensor, and detecting the wind pressure P2 at the wind volume flow rate point 2 by the second air pressure sensor; if the wind pressure P1 at the wind volume flow rate point 1 is not equal to the wind pressure P2 at the wind volume flow rate point 2, then judging that the fan is working normally; if the wind pressure P1 at the wind volume flow rate point 1 is equal to the wind pressure P2 at the wind volume flow rate point 2, then judging that the fan is operating at fault" is specifically:

[0016] The wind pressure P1 at the wind volume and velocity point 1 is detected by a first air pressure sensor, and the wind pressure signal is converted into an electrical signal G1;

[0017] The wind pressure P2 at the wind volume and flow rate point 2 is detected by a second air pressure sensor, and the wind pressure signal is converted into an electrical signal G2;

[0018] Inputting the electrical signal G1 and the electrical signal G2 into the comparison operation module for comparison operation;

[0019] If the electrical signal G1 and the electrical signal G2 are not equal, it is determined that the fan is working normally, and the comparison operation module outputs an instruction that the fan is working normally;

[0020] If the electric signal G1 is equal to the electric signal G2, it is determined that the fan operation fails, and the comparison operation module outputs an instruction indicating that the fan operation fails.

[0021] Preferably, the comparison operation module is an operational amplifier.

[0022] Preferably, the wind volume flow rate and wind pressure conversion strategy is: if the wind pressure P1 at the wind volume flow rate point one is less than the wind pressure P2 at the wind volume flow rate point two, then the wind volume flow rate V1 at the wind volume flow rate point one is greater than the wind volume flow rate V2 at the wind volume flow rate point two; if the wind pressure P1 at the wind volume flow rate point one is greater than the wind pressure P2 at the wind volume flow rate point two, then the wind volume flow rate V1 at the wind volume flow rate point one is less than the wind volume flow rate V2 at the wind volume flow rate point two.

[0023] After adopting the above method, two points on the power electronic device with different air volume and flow rates are found according to the air volume and flow rate judgment strategy, which are air volume and flow rate point 1 and air volume and flow rate point 2, respectively. The air volume and flow rate of the air volume and flow rate point 1 is V1, and the air volume and flow rate of the air volume and flow rate point 2 is V2, V1≠V2; the air volume and flow rate point 1 is provided with a first air pressure sensor, and the air volume and flow rate point 2 is provided with a second air pressure sensor; the wind pressure P1 of the air volume and flow rate point 1 is detected by the first air pressure sensor, and the wind pressure P2 of the air volume and flow rate point 2 is detected by the second air pressure sensor; if the wind pressure P1 of the air volume and flow rate point 1 is greater than the wind pressure P2 of the air volume and flow rate point 2, the wind pressure P2 of the air volume and flow rate point 2 is greater than the wind pressure P2 of the air volume and flow rate point 2. If the wind pressure P1 at the wind volume and velocity point one is not equal to the wind pressure P2 at the wind volume and velocity point two, the fan is judged to be working normally according to the wind volume and velocity and wind pressure conversion strategy; if the wind pressure P1 at the wind volume and velocity point one is equal to the wind pressure P2 at the wind volume and velocity point two, the fan is judged to be faulty according to the wind volume and velocity and wind pressure conversion strategy; the fan fault detection method can solve the problem that the existing fan detection system cannot detect the wind pressure. Through the fan detection method, the fan operation status can be detected in real time at a certain distance from the fan outlet, which is not affected by temperature and altitude, is simple to set up, does not contact the fan itself during detection, and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A control connection diagram of a fan fault detection method of the present invention;

[0025] Figure 2A detection setting diagram of a fan fault detection method according to a second embodiment of the present invention;

[0026] Figure 3 This is a detection setting diagram of a fan fault detection method according to Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. 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. Embodiment 1

[0028] See also Figure 1 , Figure 1 A control connection diagram of a fan fault detection method of the present invention;

[0029] The present embodiment discloses a fan fault detection method, and provides a power electronic device, wherein the air outlet of the fan faces the power electronic device, and the method comprises the following steps: finding two points on the power electronic device with different air volume and flow rates according to an air volume and flow rate judgment strategy, namely, air volume and flow rate point 1 401 and air volume and flow rate point 2 402, the air volume and flow rate V1 of the air volume and flow rate point 1 401, the air volume and flow rate V2 of the air volume and flow rate point 2 402, and V1≠V2;

[0030] The air volume flow rate point 1 401 is provided with a first air pressure sensor 10, and the air volume flow rate point 2 402 is provided with a second air pressure sensor 20;

[0031] The wind pressure P1 at the wind volume and velocity point 1 401 is detected by the first air pressure sensor 10, and the wind pressure P2 at the wind volume and velocity point 2 402 is detected by the second air pressure sensor 20;

[0032] If the wind pressure P1 at the wind speed point 1 401 is not equal to the wind pressure P2 at the wind speed point 2 402, the fan is judged to be operating normally according to the wind speed and wind pressure conversion strategy;

[0033] If the wind pressure P1 at the wind volume flow rate point 1 401 and the wind pressure P2 at the wind volume flow rate point 2 402 are equal, it is determined that a fan operation failure occurs according to the wind volume flow rate and wind pressure conversion strategy. Embodiment 2

[0034] See also Figure 2 , Figure 2 A detection setting diagram of a fan fault detection method according to Embodiment 2 of the present invention;

[0035] This embodiment is based on the first embodiment. In this embodiment, the power electronic device is a printed circuit board 40 .

[0036] The air volume flow rate judgment strategy is as follows: the air volume flow rate point 1 401 is set on the upper surface of the printed circuit board 40, and the air volume flow rate point 2 402 is set on the lower surface of the printed circuit board 40; along the wind direction of the fan outlet, the path length from the starting point of the upper surface of the printed circuit board 40 to the air volume flow rate point 1 401 is L1, and the path length from the starting point of the lower surface of the printed circuit board 40 to the air volume flow rate point 2 402 is L2; ​​if L1≠L2, it is judged that the air volume flow rate V1 of the air volume flow rate point 1 401 is not equal to the air volume flow rate V2 of the air volume flow rate point 2 402, and the air volume flow rate point 1 401 and the air volume flow rate point 2 42 are the air volume flow rate points to be found by the fan fault detection method.

[0037] When the fan is blowing air, since the wind passes through the upper and lower sides of the printed circuit board 40, the path of the upper surface of the printed circuit board 40 is longer than that of the lower surface, the flow velocity V on the upper surface of the printed circuit board 40 is fast and the pressure P is small; the flow velocity V on the lower surface of the printed circuit board 40 is slow and the pressure P is large. Embodiment 3

[0038] See also Figure 3 , Figure 3 A detection setting diagram of a fan fault detection method according to Embodiment 2 of the present invention;

[0039] This embodiment is based on the first embodiment. In this embodiment, the power electronic device is a printed circuit board.

[0040] The air volume flow rate judgment strategy is as follows: the plane where the printed circuit board 40 is located forms a fixed angle θ with the air outlet direction of the fan outlet; the air volume flow rate point 1 401 is set on the upper surface of the printed circuit board 40, and the air volume flow rate point 2 402 is set on the lower surface of the printed circuit board 40. It is judged that the air volume flow rate V1 of the air volume flow rate point 1 401 is not equal to the air volume flow rate V2 of the air volume flow rate point 2 402. The air volume flow rate point 1 401 and the air volume flow rate point 2 402 are the air volume flow rate points to be found by the fan fault detection method.

[0041] When the fan blows air, since the printed circuit board 40 forms a fixed angle θ with the wind direction, the upper surface of the printed circuit board 40 faces the wind, and the lower surface of the printed circuit board 40 blocks the wind. The flow velocity V on the upper surface of the printed circuit board 40 is fast and the pressure P is small; the flow velocity V on the lower surface of the printed circuit board 40 is slow and the pressure P is large. Embodiment 4

[0042] This embodiment is based on the first embodiment. In this embodiment, a comparison operation module is further provided. The step of "detecting the wind pressure P1 at the wind volume flow rate point 1 401 by the first air pressure sensor 10, and detecting the wind pressure P2 at the wind volume flow rate point 2 402 by the second air pressure sensor 20; if the wind pressure P1 at the wind volume flow rate point 1 401 is not equal to the wind pressure P2 at the wind volume flow rate point 2 402, judging that the fan is working normally according to the wind volume flow rate and wind pressure conversion strategy; if the wind pressure P1 at the wind volume flow rate point 1 401 is equal to the wind pressure P2 at the wind volume flow rate point 2 402, judging that the fan is operating at fault according to the wind volume flow rate and wind pressure conversion strategy" is specifically:

[0043] The wind pressure P1 at the wind volume and velocity point 1 401 is detected by the first air pressure sensor 10, and the wind pressure signal is converted into an electrical signal G1;

[0044] The wind pressure P2 at the wind volume and flow rate point 2 402 is detected by the second air pressure sensor 20, and the wind pressure signal is converted into an electrical signal G2;

[0045] Input the electrical signal G1 and the electrical signal G2 into the comparison operation module for comparison operation;

[0046] If the electrical signal G1 and the electrical signal G2 are not equal, it is determined that the fan is working normally, and the comparison operation module 30 outputs an instruction that the fan is working normally;

[0047] If the electric signal G1 is equal to the electric signal G2, it is determined that the fan operation fails, and the comparison operation module outputs an instruction indicating that the fan operation fails.

[0048] In this embodiment, the preferred comparison operation module is an operational amplifier 30 .

[0049] The wind volume flow rate and wind pressure conversion strategy is: if the wind pressure P1 of wind volume flow rate point 1 401 is less than the wind pressure P2 of wind volume flow rate point 2 402, then the wind volume flow rate V1 of wind volume flow rate point 1 401 is greater than the wind volume flow rate V2 of wind volume flow rate point 2 402; if the wind pressure P1 of wind volume flow rate point 1 401 is greater than the wind pressure P2 of wind volume flow rate point 2 402, then the wind volume flow rate V1 of wind volume flow rate point 1 401 is less than the wind volume flow rate V2 of wind volume flow rate point 2 402.

[0050] By Bernoulli's formula It can be seen that in the formula, p is the pressure at a certain point in the fluid, V is the flow velocity of the fluid at that point, ρ is the fluid density, g is the acceleration of gravity, h is the height of the point, and C is a constant;

[0051] Around the fan fault detection device, the fluid density ρ, the gravitational acceleration g, and the height h of the fan fault detection device are the same values. When the flow velocity V at a certain point is greater, the pressure P is smaller.

[0052] The fan fault detection method can solve the problem that the existing fan detection system cannot detect the wind pressure. The fan detection method can detect the fan operation status in real time at a certain distance from the fan outlet. It is not affected by temperature and altitude, is simple to set up, does not contact the fan itself during detection, and has low cost.

[0053] It should be understood that the above are only preferred embodiments of the present invention, and the patent scope of the present invention cannot be limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fan fault detection method, characterized in that: A power electronic device is provided, wherein the air outlet of the fan faces the power electronic device, and the method comprises the following steps: finding two points on the power electronic device with different air volume and flow rates according to an air volume and flow rate judgment strategy, namely, air volume and flow rate point 1 and air volume and flow rate point 2, the air volume and flow rate of the air volume and flow rate point 1 is V1, the air volume and flow rate of the air volume and flow rate point 2 is V2, and V1≠V2; The first air volume velocity point is provided with a first air pressure sensor, and the second air volume velocity point is provided with a second air pressure sensor; The wind pressure P1 at the wind volume and velocity point 1 is detected by the first air pressure sensor, and the wind pressure P2 at the wind volume and velocity point 2 is detected by the second air pressure sensor; If the wind pressure P1 at wind speed point 1 is not equal to the wind pressure P2 at wind speed point 2, the fan is judged to be operating normally according to the wind speed and wind pressure conversion strategy; If the wind pressure P1 at wind speed point 1 and the wind pressure P2 at wind speed point 2 are equal, it is determined that the fan operation is faulty according to the wind speed and wind pressure conversion strategy; The power electronic device is a printed circuit board; The air volume flow rate judgment strategy is as follows: the air volume flow rate point 1 is set on the upper surface of the printed circuit board, and the air volume flow rate point 2 is set on the lower surface of the printed circuit board; along the wind direction of the fan outlet, the path length from the starting point of the upper surface of the printed circuit board to the air volume flow rate point 1 is L1, and the path length from the starting point of the lower surface of the printed circuit board to the air volume flow rate point 2 is L2; ​​if L1≠L2, it is judged that the air volume flow rate V1 of the air volume flow rate point 1 is not equal to the air volume flow rate V2 of the air volume flow rate point 2, and the air volume flow rate point 1 and the air volume flow rate point 2 are the air volume flow rate points to be found by the fan fault detection method; A comparison operation module is also provided; the step of "detecting the wind pressure P1 at the wind volume flow rate point 1 by the first air pressure sensor, and detecting the wind pressure P2 at the wind volume flow rate point 2 by the second air pressure sensor; if the wind pressure P1 at the wind volume flow rate point 1 is not equal to the wind pressure P2 at the wind volume flow rate point 2, it is determined that the fan is working normally; if the wind pressure P1 at the wind volume flow rate point 1 is equal to the wind pressure P2 at the wind volume flow rate point 2, it is determined that the fan is operating at fault" is specifically: The wind pressure P1 at the wind volume and velocity point 1 is detected by a first air pressure sensor, and the wind pressure signal is converted into an electrical signal G1; The wind pressure P2 at the wind volume and flow rate point 2 is detected by a second air pressure sensor, and the wind pressure signal is converted into an electrical signal G2; Inputting the electrical signal G1 and the electrical signal G2 into the comparison operation module for comparison operation; If the electrical signal G1 and the electrical signal G2 are not equal, it is determined that the fan is working normally, and the comparison operation module outputs an instruction that the fan is working normally; If the electric signal G1 is equal to the electric signal G2, it is determined that the fan operation fails, and the comparison operation module outputs an instruction indicating that the fan operation fails.

2. The fan fault detection method according to claim 1, characterized in that: The air volume and flow rate judgment strategy is as follows: the plane where the printed circuit board is located forms a fixed angle θ with the air outlet direction of the fan outlet; the air volume and flow rate point one is set on the upper surface of the printed circuit board, and the air volume and flow rate point two is set on the lower surface of the printed circuit board, and it is judged that the air volume and flow rate V1 of the air volume and flow rate point one is not equal to the air volume and flow rate V2 of the air volume and flow rate point two, and the air volume and flow rate point one and the air volume and flow rate point two are the air volume and flow rate points to be found by the fan fault detection method.

3. The fan failure detection method according to claim 1, characterized in that: The comparison operation module is an operational amplifier.

4. The fan failure detection method according to claim 1, characterized in that: The wind volume flow rate and wind pressure conversion strategy is: if the wind pressure P1 at the wind volume flow rate point one is less than the wind pressure P2 at the wind volume flow rate point two, then the wind volume flow rate V1 at the wind volume flow rate point one is greater than the wind volume flow rate V2 at the wind volume flow rate point two; if the wind pressure P1 at the wind volume flow rate point one is greater than the wind pressure P2 at the wind volume flow rate point two, then the wind volume flow rate V1 at the wind volume flow rate point one is less than the wind volume flow rate V2 at the wind volume flow rate point two.

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