High-reliability power fan for DCS system

Abstract

The application discloses a high-reliability power fan of a DCS system and relates to the field of power fans, which solves the problem that the existing power fan can cause the DCS system to fail to normally operate due to excessive winding fiber overload short circuit, and comprises a power shell and a heat dissipation fan installed on the top of the inner side of the power shell, the side end of the heat dissipation fan is provided with a fixing shell, and the fixing shell is fixedly connected with the power shell. Through the action of the on-off mechanism and the rotating mechanism, when the DCS system is started or normally operated, the heat dissipation fan suddenly stops rotating, at this time, the swing assembly is not hindered and is magnetically attracted and moved by the triggered assembly, the electrical connection between the two copper springs is interrupted, the heat dissipation fan is powered off, the motor in the heat dissipation fan is prevented from being overloaded for a long time to cause short circuit and damage the heat dissipation fan, and the DCS system fails. Meanwhile, the swing assembly also starts the buzzer through the micro-control switch to issue a warning to inform the staff.

Description

Technical Field

[0001] This invention relates to the field of power supply fans, specifically a high-reliability power supply fan for DCS systems. Background Technology

[0002] The existing power supply of the DCS control system uses fan cooling, with the fan placed inside the power supply housing and the fan power source taken from the DCS control system itself.

[0003] In actual use, the environment of a DCS control system power supply is not a cleanroom. During operation, dust or fibers are drawn into the power supply casing by the fan. Most of the dust or fibers adhere to the fan blades and shaft. When a large amount of fiber impurities adhere to the fan shaft, it can cause entanglement, creating significant resistance to the fan's rotation. When the motor rotor inside the fan cannot rotate due to this resistance, a severe overload occurs. The motor gradually heats up until it short-circuits. The short circuit in the fan causes the DCS control system power supply to trip, preventing the entire DCS control system from operating normally and seriously threatening the safe operation of the process equipment. To address this, we propose a high-reliability power supply fan for DCS systems. Summary of the Invention

[0004] The purpose of this invention is to provide a high-reliability power supply fan for DCS systems that prevents power failure caused by fan short circuits, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-reliability power supply fan for a DCS system includes a power supply housing and a cooling fan mounted on the top inner side of the power supply housing. A fixed shell is mounted on the side of the cooling fan, and the fixed shell is fixedly connected to the power supply housing. A fan power supply is fixedly installed inside the fixed shell. The positive and negative input terminals of the fan power supply are connected in parallel with the corresponding terminals of the power supply housing. The positive and negative output terminals of the fan power supply are respectively connected to wire one and wire two. The end of wire one away from the fan power supply is connected to the cooling fan. A wire four is provided on the side of the cooling fan, and wire one, the cooling fan, wire four, and wire two are connected in series. A switching mechanism is installed between wire two and wire four to switch the connection circuit of the cooling fan. A rotating mechanism is installed on the outside of the switching mechanism. The current output by the fan power supply is direct current.

[0007] Preferably, the switching mechanism includes a fixed frame fixedly installed inside the fixed housing. A connecting seat two is fixedly clamped at the upper end of the fixed frame. Both wire two and wire four are embedded inside the connecting seat two. Two copper springs are electrically installed at the end of the connecting seat two away from wire two and wire four, and the two copper springs are electrically connected to wire two and wire four respectively. A swinging component is installed between the two copper springs, and an actuating component is installed at the bottom of the connecting seat two. The two copper springs are electrically connected through a conductive part.

[0008] Preferably, the swing assembly includes a bracket fixedly installed inside the fixed frame, and a swing arm is rotatably installed on the upper end of the bracket. Carbon alloy metal blocks and arc plates are fixedly installed on both sides of the swing arm. The arc plates are distributed between the two copper springs. The arc plates include a conductive part and an insulating part, and the insulating part is distributed at the bottom of the conductive part. The weight of the arc plates is greater than the weight of the carbon alloy metal blocks. In the power-off state, the conductive part of the arc plates is located between the two copper springs.

[0009] Preferably, the triggering component includes a first connecting seat located below the second connecting seat, and the first connecting seat is fixedly connected to the fixing frame. Two wires three are connected in parallel to the positive and negative terminals of the fan power supply, and both wires three are embedded inside the first connecting seat. The ends of the two wires three away from the fan power supply are connected in series with a threaded coil through the first connecting seat. One of the wires three is connected in series with a resistor. A bent iron column is installed in the hollow area of ​​the threaded coil, and the bent iron column is fixedly connected to the first connecting seat. The threaded coil and the two wires three are connected in parallel with the first, second, and fourth wires. When the threaded coil is energized, its bent iron column can generate magnetism and magnetically attract the carbon alloy metal block.

[0010] Preferably, the rotating mechanism includes a drive shaft rotatably installed inside the fan power supply, and a drive belt is installed between the drive shaft and the cooling fan shaft. An inclined plate is fixedly installed on the outer surface of the drive shaft. When the power is off, the lower end of the inclined plate is higher than the upper end of the arc plate, ensuring that the arc plate will not obstruct the rotation of the inclined plate when the drive shaft is rotating.

[0011] Preferably, a buzzer mechanism is installed on the outside of the fixing frame, and the buzzer mechanism includes a buzzer fixedly installed inside the fan power supply, and a micro-control switch is installed on the upper end of the buzzer. A toggle block is fixedly installed on the outside of the carbon alloy metal block. When the carbon alloy metal block is magnetically attracted and moved downward by the bent iron column, the toggle block can press the micro-control switch.

[0012] Preferably, an auxiliary reset component is installed at the end of the elbow iron column away from the connecting seat. The auxiliary reset component includes a contact rod that is slidably embedded in the end of the elbow iron column, and a spring is fixedly installed between the bottom of the contact rod and the elbow iron column. The contact rod is made of a non-metallic hard material, and the non-metallic contact rod will not be affected by magnetism.

[0013] Preferably, the electromagnetic attraction between the bent iron column and the carbon alloy metal block is greater than the elastic force generated by the spring compression, so as to ensure that the spring does not cause significant obstruction to the carbon alloy metal block.

[0014] Preferably, the swing arm is provided with a damping component inside. The damping component includes a baffle fixedly installed in the middle of the fixed frame. The cross-section of the baffle is parallel to the axis of the threaded coil. An arc tube is fixedly embedded inside the swing arm, and a magnetic column is slidably sleeved on the top of the arc tube. An arc rod is fixedly installed at the lower end of the magnetic column, and the lower end of the arc rod is fixedly connected to the baffle. The center of the arc tube and the arc rod is the rotation point of the swing arm. The arc tube is made of copper. When the magnetic column moves inside the arc tube, it can generate resistance under the action of electromagnetic damping.

[0015] Preferably, the upper part of the baffle is covered with a silicone pad. The silicone pad is to prevent the arc plate from hitting the baffle when it quickly resets, and can reduce the impact force and the resulting reaction force.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This invention utilizes a switching mechanism and a rotating mechanism. When the DCS system is activated or operating normally, if the cooling fan suddenly stops rotating, the swing component, no longer obstructed, is magnetically attracted and moved by the trigger component, interrupting the electrical connection between the two copper springs and cutting off power to the cooling fan. This prevents the motor in the cooling fan from being overloaded for a long time, which could lead to a short circuit, damage to the cooling fan, and DCS system failure. At the same time, the swing component will also activate the buzzer via a micro-control switch to issue an alarm to the staff. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the cooling fan and the mounting shell structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal structure of the fixed shell of the present invention;

[0021] Figure 4 This is a top view of the cooling fan of the present invention;

[0022] Figure 5 This is a schematic diagram of the transmission shaft and inclined plate structure of the present invention;

[0023] Figure 6 This is a schematic diagram of the buzzer structure of the present invention;

[0024] Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle;

[0025] Figure 8 This is a schematic diagram of the arc tube and magnet column structure of the present invention;

[0026] Figure 9 This is a schematic diagram of the conductive part and insulating cloth structure of the present invention;

[0027] Figure 10 This is a schematic diagram of the circuit connection of the present invention.

[0028] In the diagram: 1-Power supply housing; 2-Cooling fan; 3-Fixed housing; 4-Fan power supply; 5-On / off mechanism; 6-Touch component; 7-Rotation mechanism; 8-Buzzer mechanism; 9-Swing component; 10-Auxiliary reset component; 11-Fixed frame; 12-Connector 1; 13-Connector 2; 14-Wire 1; 15-Wire 2; 16-Wire 3; 17-Wire 4; 18-Threaded coil; 19-Elbow iron column; 20-Bracket; 21-Swing arm; 22-Carbon alloy metal block; 23-Arc plate; 24-Copper spring; 25-Conductive part; 26-Insulating part; 27-Arc tube; 28-Baffle; 29-Arc rod; 30-Magnetic column; 31-Drive shaft; 32-Inclined plate; 33-Drive belt; 34-Buzzer; 35-Micro switch; 36-Toggle block; 37-Contact rod; 38-Spring. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1

[0031] Please see Figures 1-4The diagram shows a high-reliability power supply fan for a DCS system, comprising a power supply housing 1 and a cooling fan 2 installed on the top inner side of the power supply housing 1. A fixed housing 3 is installed on the side of the cooling fan 2, and the fixed housing 3 is fixedly connected to the power supply housing 1. A fan power supply 4 is fixedly installed inside the fixed housing 3. The positive and negative input terminals of the fan power supply 4 are connected in parallel with the corresponding terminals of the power supply housing 1. The positive and negative output terminals of the fan power supply 4 are respectively connected with wire 14 and wire 2 15, and the end of wire 14 away from the fan power supply 4 is connected to the cooling fan 2. A wire 4 17 is provided on the side of the cooling fan 2, and wire 14, cooling fan 2, wire 4 17 and wire 2 15 are connected in series. A switching mechanism 5, which can switch the connection circuit of the cooling fan 2, is installed between wire 2 15 and wire 4 17, and a rotating mechanism 7 is installed on the outside of the switching mechanism 5. The current output by the fan power supply 4 is direct current.

[0032] Please see Figure 5 , Figure 6 and Figure 8 The switching mechanism 5 shown in the figure includes a fixed frame 11 fixedly installed inside the fixed housing 3. The upper end of the fixed frame 11 is fixedly clamped with a connecting seat 2 13. The wires 2 15 and 4 17 are both embedded inside the connecting seat 2 13. Two copper springs 24 are electrically installed at the end of the connecting seat 2 13 away from the wires 2 15 and 4 17, and the two copper springs 24 are electrically connected to the wires 2 15 and 4 17 respectively. A swing component 9 is installed between the two copper springs 24, and an actuating component 6 is installed at the bottom of the connecting seat 2 13. The two copper springs 24 are electrically connected through a conductive part 25.

[0033] Please see Figure 8 and Figure 9 The swing assembly 9 shown in the figure includes a bracket 20 fixedly installed inside the fixed frame 11, and a swing arm 21 is rotatably installed on the upper end of the bracket 20. Carbon alloy metal blocks 22 and arc plates 23 are fixedly installed on both sides of the swing arm 21. The arc plates 23 are distributed between two copper springs 24. The arc plates 23 include a conductive part 25 and an insulating part 26, and the insulating part 26 is distributed at the bottom of the conductive part 25. The weight of the arc plates 23 is greater than the weight of the carbon alloy metal blocks 22. In the power-off state, the conductive part 25 of the arc plates 23 is located between the two copper springs 24.

[0034] Please see Figure 5 and Figure 6The trigger component 6 shown in the figure includes a first connector 12 located below the second connector 13, and the first connector 12 is fixedly connected to the fixing frame 11. Two third wires 16 are installed in parallel at the positive and negative terminals of the output terminal of the fan power supply 4, and the third wires 16 are embedded inside the first connector 12. The ends of the two third wires 16 away from the fan power supply 4 are connected in series with a threaded coil 18 through the first connector 12. One of the third wires 16 is connected in series with a resistor. A bent iron column 19 is installed in the hollow area of ​​the threaded coil 18, and the bent iron column 19 is fixedly connected to the first connector 12. The threaded coil 18 and the two third wires 16 are connected in parallel with the first wire 14, the second wire 15, and the fourth wire 17. When the threaded coil 18 is energized, its bent iron column 19 can generate magnetism and magnetically attract the carbon alloy metal block 22.

[0035] Please see Figure 4 and Figure 5 The rotating mechanism 7 shown in the figure includes a drive shaft 31 rotatably installed inside the fan power supply 4, and a drive belt 33 is installed between the drive shaft 31 and the rotating shaft of the cooling fan 2. An inclined plate 32 is fixedly installed on the outer surface of the drive shaft 31. When the power is off, the lower end of the inclined plate 32 is higher than the upper end of the arc plate 23, ensuring that the arc plate 23 will not obstruct the rotation of the inclined plate 32 when the drive shaft 31 is rotating.

[0036] Please see Figure 7 In the diagram, the electromagnetic attraction between the bent iron column 19 and the carbon alloy metal block 22 is greater than the elastic force generated by the compression of the spring 38, so as to ensure that the spring 38 will not cause significant obstruction to the carbon alloy metal block 22.

[0037] Working principle to prevent power supply failure caused by fan short circuit: In this solution, the power supply housing 1 is installed horizontally. When the terminals of the power supply housing 1 are not energized, the two copper springs 24 are electrically connected through the conductive part 25 of the arc plate 23. When the terminals of the power supply housing 1 are energized, the fan power supply 4 connected in parallel with the terminals of the power supply housing 1 is also energized. The cooling fan 2 is energized through the cooperation of wire 14, wire 15, wire 17, copper springs 24 and conductive part 25. Wire 3 16 and the threaded coil 18 are also energized. In this state, the cooling fan 2 has two possible failure phenomena, as follows:

[0038] Phenomenon 1: When the cooling fan 2 is first powered on, the rotor of the motor inside the cooling fan 2 cannot rotate due to fiber impurities entangled in the shaft, causing the motor to be severely overloaded. Since the drive shaft 31 cannot drive the inclined plate 32 to rotate quickly clockwise, it will move the arc plate 23. At this time, the arc plate 23 is not obstructed by the inclined plate 32. Under the action of the energized threaded coil 18, the bent iron column 19 generates magnetism, so that the bent iron column 19 can attract the carbon alloy metal block 22, causing the carbon alloy metal block 22 to swing downward and the side arc plate 23 to swing upward. During the swing, the insulating part 26 of the arc plate 23 is placed between the two copper springs 24, causing the fan power supply 4 to be cut off and the motor to stop running.

[0039] Phenomenon 2: During the use of cooling fan 2, impurities and fibers in the working environment are continuously drawn in by cooling fan 2. The impurities and fibers are wrapped around the shaft of cooling fan 2, causing the resistance of the shaft to increase until it can no longer rotate. At this time, the arc plate 23 will also experience the situation that occurred in phenomenon 1, causing the motor to stop running.

[0040] In the event of either of the two fault conditions, the power to the cooling fan 2 should be cut off in a timely manner to prevent the motor inside the cooling fan 2 from being overloaded for a long time, causing overheating and short circuit, which would damage the cooling fan 2 and affect the normal operation of the DCS system.

[0041] Example 2

[0042] Please see Figure 6 and Figure 7 This embodiment further illustrates Example 1. A buzzer mechanism 8 is installed on the outside of the fixing frame 11. The buzzer mechanism 8 includes a buzzer 34 fixedly installed inside the fan power supply 4. A micro-control switch 35 is installed on the upper end of the buzzer 34. A toggle block 36 is fixedly installed on the outside of the carbon alloy metal block 22. When the carbon alloy metal block 22 is magnetically attracted and moved downward by the bent iron column 19, the toggle block 36 can press the micro-control switch 35.

[0043] In this embodiment: after the cooling fan 2 malfunctions and is powered off, the carbon alloy metal block 22 is magnetically attracted and attracted by the bent iron column 19. During the downward swing of the carbon alloy metal block 22, the micro-control switch 35 can be triggered by the toggle block 36 to start the buzzer 34, so that the buzzer 34 will sound an alarm and promptly inform the staff of the malfunction of the cooling fan 2.

[0044] Example 3

[0045] Please see Figure 6 and Figure 7This embodiment further illustrates other embodiments: an auxiliary reset assembly 10 is installed at the end of the elbow iron column 19 away from the connecting seat 12. The auxiliary reset assembly 10 includes a contact rod 37 that is slidably embedded in the end of the elbow iron column 19, and a spring 38 is fixedly installed between the bottom of the contact rod 37 and the elbow iron column 19. The contact rod 37 is made of a non-metallic hard material, and the non-metallic contact rod 37 is not affected by magnetism.

[0046] In this embodiment: after the cooling fan 2 is powered off, the carbon alloy metal block 22 is attracted by the bent iron column 19. When the entire power supply is turned off and the cooling fan 2 is being repaired, the magnetism of the bent iron column 19 disappears, and the reaction force generated by its compression spring 38 can push the carbon alloy metal block 22 through the contact rod 37, causing the carbon alloy metal block 22 to swing upward, so that the entire swing arm 21 performs a reset action.

[0047] Example 4

[0048] Please see Figure 8 and Figure 9 This embodiment further illustrates, for other embodiments, that the swing arm 21 is provided with a damping component inside. The damping component includes a baffle 28 fixedly installed in the middle of the fixed frame 11. The cross-section of the baffle 28 is parallel to the axis of the threaded coil 18. An arc tube 27 is fixedly embedded inside the swing arm 21, and a magnet column 30 is slidably sleeved on the top of the arc tube 27. An arc rod 29 is fixedly installed at the lower end of the magnet column 30, and the lower end of the arc rod 29 is fixedly connected to the baffle 28. The center of the arc tube 27 and the arc rod 29 is the rotation point of the swing arm 21. The arc tube 27 is made of copper. When the magnet column 30 moves inside the arc tube 27, it can generate resistance under the action of electromagnetic damping. A silicone pad is attached to the upper part of the baffle 28. The silicone pad is to prevent the arc plate 23 from hitting the baffle 28 when it quickly resets, which can reduce the impact force and the resulting reaction force.

[0049] In this embodiment: When the cooling fan 2 is running under normal conditions, the drive shaft 31 drives the inclined plate 32 to rotate rapidly clockwise, continuously pushing and obstructing the arc plate 23, preventing the arc plate 23 from swinging upward. During the pushing process, the inclined plate 32 overcomes the electromagnetic damping of the magnet column 30, causing the arc plate 23 to reset and swing downward, but the swing speed is still very fast. When the arc plate 23 hits the baffle 28 and is ejected by the reaction force, the electromagnetic damping can slow down the ejection speed of the arc plate 23 and reduce the impact force of the arc plate 23.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-reliability power supply fan for a DCS system, comprising a power supply housing (1) and a cooling fan (2) mounted on the top inner side of the power supply housing (1), characterized in that: The cooling fan (2) is equipped with a fixed shell (3) on its side, and the fixed shell (3) is fixedly connected to the power supply shell (1). The fan power supply (4) is fixedly installed inside the fixed shell (3). The positive and negative input terminals of the fan power supply (4) are connected in parallel with the corresponding terminals of the power supply shell (1). The positive and negative output terminals of the fan power supply (4) are respectively equipped with wire one (14) and wire two (15). The end of wire one (14) away from the fan power supply (4) is connected to the cooling fan (2). The side of the cooling fan (2) is provided with wire four (17). Wire one (14), the cooling fan (2), wire four (17) and wire two (15) are connected in series. The switching mechanism (5) is installed between the second wire (15) and the fourth wire (17) to switch the connection circuit of the cooling fan (2), and a rotating mechanism (7) is installed on the outside of the switching mechanism (5). The switching mechanism (5) includes a fixed frame (11) fixedly installed inside the fixed shell (3). A connecting seat (13) is fixedly clamped at the upper end of the fixed frame (11). The wires 15 and 4 (17) are embedded inside the connecting seat (13). Two copper springs (24) are electrically installed at the end of the connecting seat (13) away from the wires 15 and 4 (17). The two copper springs (24) are electrically connected to the wires 15 and 4 (17) respectively. A swing component (9) is installed between the two copper springs (24). A trigger component (6) is installed at the bottom of the connecting seat (13). The swing assembly (9) includes a bracket (20) fixedly installed inside the fixed frame (11), and a swing arm (21) is rotatably installed on the upper end of the bracket (20). Carbon alloy metal blocks (22) and arc plates (23) are fixedly installed on both sides of the swing arm (21). The arc plates (23) are distributed between the two copper springs (24). The arc plates (23) include a conductive part (25) and an insulating part (26), and the insulating part (26) is distributed at the bottom of the conductive part (25). The weight of the arc plates (23) is greater than the weight of the carbon alloy metal blocks (22).

2. The high-reliability power supply fan for a DCS system according to claim 1, characterized in that: The trigger component (6) includes a first connector (12) located below the second connector (13), and the first connector (12) is fixedly connected to the fixing frame (11). Two wires (16) are installed in parallel on the positive and negative terminals of the output terminal of the fan power supply (4), and the wires (16) are embedded inside the first connector (12). The ends of the two wires (16) away from the fan power supply (4) are connected in series with a threaded coil (18) through the first connector (12). One of the wires (16) is connected in series with a resistor. A bent iron column (19) is installed in the hollow area of ​​the threaded coil (18), and the bent iron column (19) is fixedly connected to the first connector (12). The threaded coil (18) and the two wires (16) are connected in parallel with the first wire (14), the second wire (15), and the fourth wire (17).

3. A high-reliability power supply fan for a DCS system according to claim 1, characterized in that: The rotating mechanism (7) includes a drive shaft (31) rotatably installed inside the fan power supply (4), and a drive belt (33) is installed between the drive shaft (31) and the rotating shaft of the cooling fan (2). An inclined plate (32) is fixedly installed on the outer surface of the drive shaft (31). When the power is off, the lower end of the inclined plate (32) is higher than the upper end of the arc plate (23).

4. A high-reliability power supply fan for a DCS system according to claim 2, characterized in that: A buzzer mechanism (8) is installed on the outside of the fixed frame (11), and the buzzer mechanism (8) includes a buzzer (34) fixedly installed inside the fan power supply (4), and a micro-control switch (35) is installed on the upper end of the buzzer (34), and a toggle block (36) is fixedly installed on the outside of the carbon alloy metal block (22).

5. A high-reliability power supply fan for a DCS system according to claim 4, characterized in that: An auxiliary reset assembly (10) is installed at the end of the elbow iron column (19) away from the connecting seat (12). The auxiliary reset assembly (10) includes a contact rod (37) that is slidably embedded in the end of the elbow iron column (19). A spring (38) is fixedly installed between the bottom of the contact rod (37) and the elbow iron column (19). The contact rod (37) is made of a non-metallic hard material.

6. A high-reliability power supply fan for a DCS system according to claim 5, characterized in that: The electromagnetic attraction between the bent iron column (19) and the carbon alloy metal block (22) is greater than the elastic force generated by the compression of the spring (38).

7. A high-reliability power supply fan for a DCS system according to claim 2, characterized in that: The swing arm (21) is provided with a deceleration component inside. The deceleration component includes a baffle (28) fixedly installed in the middle of the fixed frame (11). The cross-section of the baffle (28) is parallel to the axis of the threaded coil (18). An arc tube (27) is fixedly embedded inside the swing arm (21). A magnet column (30) is slidably sleeved on the top of the arc tube (27). An arc rod (29) is fixedly installed at the lower end of the magnet column (30). The lower end of the arc rod (29) is fixedly connected to the baffle (28). The center of the arc tube (27) and the arc rod (29) is the rotation point of the swing arm (21). The arc tube (27) is made of copper.

8. A high-reliability power supply fan for a DCS system according to claim 7, characterized in that: The upper part of the baffle (28) is covered with a silicone pad.

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