An automatic alarm device for air compressor cooling fan failure

Abstract

This invention relates to the field of fault detection technology, and in particular to an automatic alarm device for air compressor cooling fan faults. It includes: a speed detection unit for detecting the real-time speed n of the cooling fan; a control unit for comparing the real-time speed n with a preset real-time speed standard value N, and determining whether the cooling fan has malfunctioned based on the comparison result; the control unit is also used to output a graded alarm signal in real time when the cooling fan malfunctions; and an alarm unit for receiving the graded alarm signal and issuing a real-time alarm. This invention, by adding an alarm unit to provide graded alarms for different fault types, can effectively achieve timely fault detection and handling, without relying on manual intervention, thus reducing the impact of cooling fan malfunctions on the cooling efficiency of the air compressor.

Description

Technical Field

[0001] This invention relates to the field of fault detection technology, and in particular to an automatic alarm device for air compressor cooling fan failure. Background Technology

[0002] Air compressors are indispensable machines in industrial production, providing great convenience to people's lives. In industrial applications, they primarily help transport required gases, such as natural gas, nitrogen, and carbon dioxide. Additionally, air compressors are generally used to assist in industrial testing. Current air compressor cooling methods include air cooling or oil cooling. Regardless of whether the air compressor cooler uses air or oil cooling, its working principle is to ensure that the air compressor does not operate at high temperatures, reducing the overall temperature and ensuring that the air compressor's operating temperature remains within a stable range.

[0003] However, in existing technologies, when the cooling fan in an air compressor malfunctions, the fault cannot be detected in real time and accurately. Traditional methods mostly rely on manual inspection, which is inaccurate and imposes a heavy workload on inspectors. Furthermore, the type of fault when the cooling fan malfunctions cannot be directly obtained in existing technologies; it can only be determined after repairing the cooling fan. This method significantly reduces production efficiency and is time-consuming and labor-intensive. Therefore, providing an automatic alarm device for air compressor cooling fan malfunctions is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic alarm device for air compressor cooling fan failure. By adding an alarm unit to classify and alarm different failure types, it can effectively realize timely detection and handling of failures without relying on manual methods, reducing the impact of cooling fan failure on the cooling efficiency of the air compressor. Furthermore, by setting different alarm modes for different failure types, the accuracy of failure type identification can be greatly improved, saving inspection personnel time in checking failure types and improving the overall operating efficiency of the device.

[0005] This invention improves upon existing technologies where, when a cooling fan in an air compressor malfunctions, the fault cannot be detected in real time and relies on manual inspection. However, manual inspection is inaccurate and imposes a heavy workload on inspectors. This invention adds an alarm unit that determines whether a cooling fan has malfunctioned based on its real-time speed and temperature. When a cooling fan malfunctions, an alarm is triggered in real time, effectively improving the accuracy of fault detection. Furthermore, it eliminates reliance on manual inspection by using automated alarm control, saving time and effort.

[0006] This invention improves upon existing technologies that cannot accurately identify fault types. Traditional methods rely on overhauling the cooling fan to determine the specific fault type, which significantly reduces production efficiency. This invention greatly improves the accuracy of fault type identification by setting different alarm modes for different fault types, saving inspection personnel time and increasing the overall operating efficiency of the device.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An automatic alarm device for air compressor cooling fan failure includes:

[0009] A speed detection unit is used to detect the real-time speed n of the cooling fan;

[0010] The control unit is used to compare the real-time rotational speed n with a preset real-time rotational speed standard value N, and determine whether the cooling fan has malfunctioned based on the comparison result; wherein,

[0011] When n < N, it is determined that the cooling fan has malfunctioned;

[0012] When n≥N, it is determined that the cooling fan is not malfunctioning;

[0013] The control unit is also used to output a graded alarm electrical signal in real time when the cooling fan fails.

[0014] An alarm unit is provided, which is used to receive the graded alarm electrical signals and provide real-time alarms.

[0015] In some embodiments of this application, the control unit is configured with a preset real-time speed matrix T0 and a preset alarm level matrix A. For the preset alarm level matrix A, A(A1, A2, A3, A4) is set, where A1 is the first preset alarm level, A2 is the second preset alarm level, A3 is the third preset alarm level, and A4 is the fourth preset alarm level, and A1 < A2 < A3 < A4.

[0016] For the preset real-time speed matrix T0, set T0(T01, T02, T03, T04), where T01 is the first preset real-time speed, T02 is the second preset real-time speed, T03 is the third preset real-time speed, T04 is the fourth preset real-time speed, and T01 < T02 < T03 < T04 < N.

[0017] The control unit is also used to select the corresponding alarm level as the graded alarm electrical signal output by the control unit in real time based on the relationship between n and the preset real-time speed matrix T0.

[0018] When n < T01, the first preset alarm level A1 is selected as the graded alarm electrical signal output by the control unit in real time;

[0019] When T01≤n<T02, the second preset alarm level A2 is selected as the graded alarm electrical signal output by the control unit in real time;

[0020] When T02≤n<T03, the third preset alarm level A3 is selected as the graded alarm electrical signal output by the control unit in real time;

[0021] When T03≤n<T04, the fourth preset alarm level A4 is selected as the graded alarm electrical signal output by the control unit in real time.

[0022] In some embodiments of this application, the control unit is further provided with a timing unit, which is used to calculate the real-time speed n0 of the cooling fan at time t0, and calculate the real-time speed n1 of the cooling fan at time t1 after a preset time, compare the difference between the real-time speed n0 and the real-time speed n1, and correct each preset alarm level according to the difference.

[0023] When n0-n1≥0, each of the preset alarm levels is increased by one level as the graded alarm electrical signal output by the control unit in real time. Among them, the fourth preset alarm level A4 is increased by one level to become the third preset alarm level A3, the third preset alarm level A3 is increased by one level to become the second preset alarm level A2, the second preset alarm level A2 is increased by one level to become the first preset alarm level A1, and the first preset alarm level A1 does not need to be increased.

[0024] When n0 - n1 < 0, each of the preset alarm levels is reduced by one level as the graded alarm electrical signal output by the control unit in real time. The first preset alarm level A1 is reduced by one level to become the second preset alarm level A2, the second preset alarm level A2 is reduced by one level to become the third preset alarm level A3, the third preset alarm level A3 is reduced by one level to become the fourth preset alarm level A4, and the fourth preset alarm level A4 does not need to be reduced.

[0025] In some embodiments of this application, the rotational speed detection unit is a Hall switch.

[0026] In some embodiments of this application, the control unit is a microcontroller.

[0027] In some embodiments of this application, it also includes:

[0028] A temperature sensor is used to detect the temperature P of the cooling fan in real time;

[0029] The control unit is also used to compare the temperature P with a preset real-time temperature standard value M, and determine whether the cooling fan has malfunctioned based on the comparison result.

[0030] When P < M, it is determined that the cooling fan is not malfunctioning;

[0031] When P ≥ M, the cooling fan is determined to be faulty.

[0032] In some embodiments of this application, the control unit is configured with a preset real-time temperature matrix K0 and a preset temperature alarm level matrix B. For the preset temperature alarm level matrix B, B(B1, B2, B3, B4) is set, where B1 is the first preset temperature alarm level, B2 is the second preset temperature alarm level, B3 is the third preset temperature alarm level, and B4 is the fourth preset temperature alarm level, and B1 < B2 < B3 < B4.

[0033] For the preset real-time temperature matrix K0, K0(K01, K02, K03, K04) is set, where K01 is the first preset real-time temperature, K02 is the second preset real-time temperature, K03 is the third preset real-time temperature, K04 is the fourth preset real-time temperature, and M≤K01<K02<K03<K04.

[0034] The control unit is also used to select the corresponding temperature alarm level as the graded alarm electrical signal output by the control unit in real time, based on the relationship between P and the preset real-time temperature matrix K0.

[0035] When P < K01, the fourth preset temperature alarm level B4 is selected as the graded alarm electrical signal output by the control unit in real time;

[0036] When K01≤P<K02, the third preset temperature alarm level B3 is selected as the graded alarm electrical signal output by the control unit in real time;

[0037] When K02≤P<K03, the second preset temperature alarm level B2 is selected as the graded alarm electrical signal output by the control unit in real time;

[0038] When K03≤P<K04, the first preset temperature alarm level B1 is selected as the graded alarm electrical signal output by the control unit in real time.

[0039] In some embodiments of this application, the control unit is further configured with preset fault types, and the control unit is also used to determine different fault types according to different graded alarm electrical signals when outputting graded alarm electrical signals.

[0040] In some embodiments of this application, the control unit is further provided with a display, which is used to display the fault type in real time when different fault types are determined according to different graded alarm electrical signals.

[0041] In some embodiments of this application, the alarm unit is an alarm device, and the alarm device uses voice alarm.

[0042] The automatic alarm device for air compressor cooling fan failure provided by this invention has the following advantages compared with the prior art:

[0043] This invention improves the overall fault alarm response efficiency of the device by adding an alarm unit. When the relevant parameters of the cooling fan, such as speed and temperature, deviate from the standard values, a fault alarm is triggered in a timely manner. It does not rely on manual inspection methods, but improves the accuracy and efficiency of fault detection through mechanized automatic detection and alarm. Attached Figure Description

[0044] Figure 1 This is a functional block diagram of the automatic alarm device for air compressor cooling fan failure of the present invention. Detailed Implementation

[0045] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0046] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0047] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the communication between the inner sides of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] In existing technologies, when a cooling fan in an air compressor malfunctions, the fault cannot be accurately identified in real time. Traditional methods mostly rely on manual inspection, which is inaccurate and imposes a heavy workload on inspectors. Furthermore, the type of cooling fan malfunction cannot be directly determined in current technologies; it can only be identified after repairing the fan, which significantly reduces production efficiency and is time-consuming and labor-intensive.

[0050] Therefore, the present invention provides an automatic alarm device for air compressor cooling fan failure. By adding an alarm unit to classify and alarm different fault types, it can effectively realize timely detection and handling of faults without relying on manual methods, reducing the impact of cooling fan failure on the cooling efficiency of air compressor. Furthermore, by setting different alarm modes for different fault types, the accuracy of fault type identification can be greatly improved, saving inspection personnel time in checking fault types and improving the overall operating efficiency of the device.

[0051] See Figure 1 As shown in the figure, the present invention discloses an automatic alarm device for air compressor cooling fan failure, comprising:

[0052] Speed ​​detection unit, used to detect the real-time speed n of the cooling fan;

[0053] The control unit compares the real-time speed n with a preset real-time speed standard value N, and determines whether the cooling fan has malfunctioned based on the comparison result; wherein,

[0054] When n < N, it is determined that the cooling fan has malfunctioned;

[0055] When n≥N, it is determined that the cooling fan is not malfunctioning;

[0056] The control unit is also used to output graded alarm electrical signals in real time when the cooling fan fails;

[0057] The alarm unit is used to receive graded alarm electrical signals and provide real-time alarms.

[0058] In one specific embodiment of this application, the control unit is configured with a preset real-time speed matrix T0 and a preset alarm level matrix A. For the preset alarm level matrix A, A(A1, A2, A3, A4) is set, where A1 is the first preset alarm level, A2 is the second preset alarm level, A3 is the third preset alarm level, and A4 is the fourth preset alarm level, and A1 < A2 < A3 < A4.

[0059] For a preset real-time speed matrix T0, set T0(T01, T02, T03, T04), where T01 is the first preset real-time speed, T02 is the second preset real-time speed, T03 is the third preset real-time speed, T04 is the fourth preset real-time speed, and T01 < T02 < T03 < T04 < N.

[0060] The control unit is also used to select the corresponding alarm level as the graded alarm electrical signal output by the control unit in real time based on the relationship between n and the preset real-time speed matrix T0.

[0061] When n < T01, the first preset alarm level A1 is selected as the hierarchical alarm electrical signal output by the control unit in real time;

[0062] When T01≤n<T02, the second preset alarm level A2 is selected as the hierarchical alarm electrical signal output by the control unit in real time;

[0063] When T02≤n<T03, the third preset alarm level A3 is selected as the hierarchical alarm electrical signal output by the control unit in real time;

[0064] When T03≤n<T04, the fourth preset alarm level A4 is selected as the hierarchical alarm electrical signal output by the control unit in real time.

[0065] In one specific embodiment of this application, the control unit is further provided with a timing unit, which is used to calculate the real-time speed n0 of the cooling fan at time t0, and calculate the real-time speed n1 of the cooling fan at time t1 after a preset time, compare the difference between the real-time speed n0 and the real-time speed n1, and correct each preset alarm level according to the difference.

[0066] When n0-n1≥0, each preset alarm level is raised by one level as the hierarchical alarm signal output by the control unit in real time. Among them, the fourth preset alarm level A4 is raised by one level to become the third preset alarm level A3, the third preset alarm level A3 is raised by one level to become the second preset alarm level A2, the second preset alarm level A2 is raised by one level to become the first preset alarm level A1, and the first preset alarm level A1 does not need to be raised.

[0067] When n0 - n1 < 0, each preset alarm level is reduced by one level as the hierarchical alarm signal output by the control unit in real time. The first preset alarm level A1 is reduced by one level to become the second preset alarm level A2, the second preset alarm level A2 is reduced by one level to become the third preset alarm level A3, the third preset alarm level A3 is reduced by one level to become the fourth preset alarm level A4, and the fourth preset alarm level A4 does not need to be reduced.

[0068] In one specific embodiment of this application, the rotational speed detection unit is a Hall switch.

[0069] In one specific embodiment of this application, the control unit is a microcontroller.

[0070] In one specific embodiment of this application, it further includes:

[0071] Temperature sensor, used to detect the temperature P of the cooling fan in real time;

[0072] The control unit is also used to compare the temperature P with the preset real-time temperature standard value M, and determine whether the cooling fan has malfunctioned based on the comparison result.

[0073] When P < M, it is determined that the cooling fan is not malfunctioning;

[0074] When P ≥ M, the cooling fan is determined to be faulty.

[0075] In one specific embodiment of this application, the control unit is configured with a preset real-time temperature matrix K0 and a preset temperature alarm level matrix B. For the preset temperature alarm level matrix B, B(B1, B2, B3, B4) is set, where B1 is the first preset temperature alarm level, B2 is the second preset temperature alarm level, B3 is the third preset temperature alarm level, and B4 is the fourth preset temperature alarm level, and B1 < B2 < B3 < B4.

[0076] For a preset real-time temperature matrix K0, set K0(K01, K02, K03, K04), where K01 is the first preset real-time temperature, K02 is the second preset real-time temperature, K03 is the third preset real-time temperature, K04 is the fourth preset real-time temperature, and M≤K01<K02<K03<K04.

[0077] The control unit is also used to select the corresponding temperature alarm level as the graded alarm electrical signal output by the control unit in real time based on the relationship between P and the preset real-time temperature matrix K0.

[0078] When P < K01, the fourth preset temperature alarm level B4 is selected as the graded alarm electrical signal output by the control unit in real time.

[0079] When K01≤P<K02, the third preset temperature alarm level B3 is selected as the graded alarm electrical signal output by the control unit in real time;

[0080] When K02≤P<K03, the second preset temperature alarm level B2 is selected as the graded alarm electrical signal output by the control unit in real time;

[0081] When K03≤P<K04, the first preset temperature alarm level B1 is selected as the graded alarm electrical signal output by the control unit in real time.

[0082] In one specific embodiment of this application, the control unit is further configured with preset fault types, and the control unit is also used to determine different fault types according to different graded alarm electrical signals when outputting graded alarm electrical signals.

[0083] In one specific embodiment of this application, the control unit is further provided with a display, which is used to display the fault type in real time when different fault types are determined according to different graded alarm electrical signals.

[0084] In one specific embodiment of this application, the alarm unit is an alarm device, and the alarm device uses voice alarm.

[0085] According to the first technical concept of the present invention, the present invention adds an alarm unit to determine whether the cooling fan has malfunctioned based on the real-time speed and temperature of the cooling fan. When the cooling fan malfunctions, an alarm is triggered in real time, which effectively improves the accuracy of fault detection. At the same time, it does not rely on manual labor and uses the automated alarm control of the device to replace manual detection, saving time and effort.

[0086] According to the second technical concept of the present invention, by setting different alarm modes corresponding to different fault types, the present invention can greatly improve the accuracy of fault type identification, save the inspection time of inspection personnel in checking fault types, and improve the overall operating efficiency of the device.

[0087] In summary, this invention, by adding an alarm unit, promptly issues graded alarms when the relevant parameters of the cooling fan, such as speed and temperature, deviate from standard values. This improves the overall fault alarm response efficiency of the device, eliminating reliance on manual inspections and enhancing the accuracy and efficiency of fault detection through mechanized automatic detection and alarming. Furthermore, the graded alarms correspond to different preset fault models, allowing inspection personnel to accurately identify the type of fault in a timely manner.

[0088] The above description is merely one embodiment of the present invention, but it cannot be used to limit the scope of the present invention. Any structural changes made based on the present invention, as long as they do not lose the essence of the present invention, should be considered to fall within the protection scope of the present invention and be subject to its restrictions.

[0089] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process and related descriptions of the system described above can be found in the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0090] It should be noted that the system provided in the above embodiments is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the modules or steps in the embodiments of the present invention can be further decomposed or combined. For example, the modules in the above embodiments can be merged into one module, or further divided into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the various modules or steps and are not considered as an improper limitation of the present invention.

[0091] Those skilled in the art will recognize that the modules and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. The programs corresponding to the software modules and method steps can be placed in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the art. To clearly illustrate the interchangeability of electronic hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the invention.

[0092] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0093] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. An air compressor cooling fan failure automatic alarm device, characterized in that, The application relates to a cooling fan fault detection device, which comprises the following parts: a rotating speed detection unit for detecting the real-time rotating speed n of a cooling fan; a control unit for comparing the real-time rotating speed n with a preset real-time rotating speed standard value N and determining whether the cooling fan is faulty according to the comparison result; wherein, when n when n the control unit is also used for outputting a graded alarm electric signal according to the real-time rotating speed when the cooling fan is faulty; an alarm unit for receiving the graded alarm electric signal and performing real-time alarm; a preset real-time rotating speed matrix T0 and a preset alarm grade matrix A are set in the control unit, wherein A (A1, A2, A3, A4) is set for the preset alarm grade matrix A, wherein A1 is a first preset alarm grade, A2 is a second preset alarm grade, A3 is a third preset alarm grade, and A4 is a fourth preset alarm grade, and A1 T0 (T01, T02, T03, T04) is set for the preset real-time rotating speed matrix T0, wherein T01 is a first preset real-time rotating speed, T02 is a second preset real-time rotating speed, T03 is a third preset real-time rotating speed, and T04 is a fourth preset real-time rotating speed, and T01 the control unit is also used for selecting a corresponding alarm grade as the graded alarm electric signal output by the control unit according to the relationship between n and the preset real-time rotating speed matrix T0; when n when T01 when T02 when T03 when T03 a timing unit is also set in the control unit, which is used for calculating the real-time rotating speed n0 of the cooling fan at t0 and calculating the real-time rotating speed n1 of the cooling fan at t1 after a preset time length, comparing the difference between the real-time rotating speed n0 and the real-time rotating speed n1, and correcting each preset alarm grade according to the difference; when n0-n1>=0, each preset alarm grade is adjusted by one grade as the graded alarm electric signal output by the control unit, wherein the fourth preset alarm grade A4 is adjusted by one grade to the third preset alarm grade A3, the third preset alarm grade A3 is adjusted by one grade to the second preset alarm grade A2, the second preset alarm grade A2 is adjusted by one grade to the first preset alarm grade A1, and the first preset alarm grade A1 does not need to be adjusted. When n0-n1<0, the preset alarm level is lowered by one level as the hierarchical alarm electrical signal output by the control unit in real time, wherein the first preset alarm level A1 is lowered by one level to the second preset alarm level A2, the second preset alarm level A2 is lowered by one level to the third preset alarm level A3, the third preset alarm level A3 is lowered by one level to the fourth preset alarm level A4, and the fourth preset alarm level A4 does not need to be lowered. 2.The air compressor cooling fan fault automatic alarm device according to claim 1, characterized in that, the rotation speed detection unit is a Hall switch. 3.The air compressor cooling fan fault automatic alarm device according to claim 1, characterized in that, the control unit is a single-chip microcomputer.

4. The air compressor cooling fan failure automatic alarm device according to claim 1, characterized in that, Further comprising: a temperature sensor for detecting the temperature P of the cooling fan in real time; the control unit is further configured to compare the temperature P with a preset real-time temperature standard value M, and determine whether the cooling fan is faulty according to the comparison result; when P 5.The air compressor cooling fan fault automatic alarm device according to claim 4, characterized in that, the control unit is provided with a preset real-time temperature matrix K0 and a preset temperature alarm level matrix B, wherein B(B1, B2, B3, B4) is set for the preset temperature alarm level matrix B, wherein B1 is the first preset temperature alarm level, B2 is the second preset temperature alarm level, B3 is the third preset temperature alarm level, and B4 is the fourth preset temperature alarm level, and B1 K0(K01, K02, K03, K04) is set for the preset real-time temperature matrix K0, wherein K01 is the first preset real-time temperature, K02 is the second preset real-time temperature, K03 is the third preset real-time temperature, and K04 is the fourth preset real-time temperature, and M≤K01 the control unit is further configured to select a corresponding temperature alarm level as the hierarchical alarm electrical signal output by the control unit in real time according to the relationship between P and the preset real-time temperature matrix K0; when P when K01≤P when K02≤P when K03≤P when K03≤P 6.The air compressor cooling fan fault automatic alarm device according to claim 1, characterized in that, The control unit is also provided with preset fault types, and the control unit is configured to determine different fault types according to different hierarchical alarm electrical signals when outputting the hierarchical alarm electrical signals.

7. The air compressor cooling fan fault automatic alarm device according to claim 6, characterized in that, The control unit is also provided with a display, and the display is configured to display the fault types in real time when different fault types are determined according to different hierarchical alarm electrical signals.

8. The air compressor cooling fan fault automatic alarm device according to claim 5, characterized in that, The alarm unit is an alarm, and the alarm adopts voice alarm.

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