Protective device and electric cabinet with same

Abstract

The utility model relates to the technical field of electrical cabinets, in particular to a protective device and an electrical cabinet with the same. The protection device comprises a protection cover which is installed in cooperation with a protection object so as to protect the top and the side edges of the protection object, and the protection cover is provided with a protection outer plate which is arranged opposite to the installation face of the protection object; and the inner frame is installed on the inner ring of the protective cover, a sealing strip is arranged between the inner frame and the protective cover, the sealing strip is in interference fit with the protective object installation face, a protective bottom plate is arranged at the bottom of the inner frame, and a first ventilation opening is formed between the protective bottom plate and the protective outer plate. Therefore, the problems of how to have a high protection level, save cost and reduce the overall energy consumption of the equipment while the heat dissipation of the electric cabinet is realized are solved.

Description

Technical Field

[0001] This utility model relates to the field of electrical cabinet technology, and more specifically, to a protective device and an electrical cabinet having the protective device. Background Technology

[0002] In the industrial sector, especially in hygiene-critical industries, production equipment, including electrical equipment, is typically flushed to maintain cleanliness and hygiene standards. Electrical equipment, such as ultraviolet (UV) control systems, often contains heat-generating components like frequency converters and power supplies. Fans are installed on the electrical cabinets to continuously circulate hot air, cooling the power components inside. The extensive use of power and heat-generating components within the cabinets necessitates cooling, and air cooling is a widely used method. However, air cooling requires ventilation openings, which are often points of entry for dust, particles, rainwater, or runoff.

[0003] With the increasing use of various fire-fighting deluge systems by customers, especially in the ultraviolet water treatment industry where there are pipes or valves around the electrical cabinets, and in some cleanroom industries where the electrical cabinets need to be flushed regularly for disinfection, and even the electrical cabinets are installed directly outdoors, the protection level requirements for the ventilation openings of the electrical cabinets are becoming increasingly higher in order to ensure the normal operation of the ventilation cabinets.

[0004] Currently, the main solution adopted is a fully enclosed electrical control cabinet combined with a cabinet air conditioner. Although this solution achieves the requirements of efficient heat dissipation and high protection level, and solves the requirements of dustproof and multi-angle waterproof, the cabinet air conditioner consumes a lot of energy, is expensive, and is relatively complicated to maintain. Therefore, it greatly increases the operating energy consumption and maintenance cost of the equipment.

[0005] Therefore, a protective device is provided that ensures efficient heat dissipation while having a high protection level (UL50ETYPE4, TYPE 4X or IEC IP56 or above), while saving initial equipment costs, reducing overall equipment operating energy consumption. Utility Model Content

[0006] To address the challenge of achieving high protection levels while simultaneously reducing costs and overall energy consumption in electrical cabinets, this invention provides a protective device comprising:

[0007] A protective cover is used to cooperate with the object to protect the top and sides of the object. The protective cover is provided with a protective outer plate that is disposed opposite to the mounting surface of the object.

[0008] An inner frame is installed on the inner ring of the protective cover. A sealing strip is provided between the inner frame and the protective cover, and the sealing strip protrudes from the edges of the inner frame and the protective cover. A protective base plate is provided at the bottom of the inner frame, and a first ventilation opening is provided between the protective base plate and the protective outer plate.

[0009] In some embodiments, the protective cover further includes protective side plates located on both sides of the protective outer plate and a protective top plate located on the top of the protective outer plate; the inner frame includes an inner frame side plate fixedly connected to the protective side plate, an inner frame top plate fixedly connected to the protective top plate, and an inner frame upright plate connected to the inner frame side plate and protruding toward the inner circle of the inner frame, and a sealing groove is provided between the inner frame upright plate and the protective side plate.

[0010] In some embodiments, a mounting bracket is also included that cooperates with the inner frame to fix the protective device to the mounting surface of the protected object, wherein the inner frame and the mounting bracket are detachably installed.

[0011] In some embodiments, cylindrical pins are provided on the two inner frame side plates of the inner frame, and the fixing frame is provided with a slot for installing the cylindrical pins. The cylindrical pins are installed in the slots to fix the inner frame relative to the fixing frame.

[0012] In some embodiments, the protective base plate is a bent structure, which includes a first base plate that is perpendicularly connected to the inner frame upright plate of the inner frame, and a second base plate that is connected to the first base plate, wherein the included angle α between the second base plate and the reverse extension line of the first base plate is [0°, 90°].

[0013] In some embodiments, the sealing strip is a T-shaped embedded sealing strip or a U-shaped snap-on sealing strip.

[0014] In some embodiments, the width of the first base plate is A, the width of the second base plate is B, and the thickness of the protective cover is D, where A = D / 2 to D / 3 and B = 10mm to 15mm.

[0015] In some embodiments, the mounting bracket is further provided with a mounting portion for detachably mounting the protective device on the mounting surface of the protected object.

[0016] The protective device provided by this utility model achieves a high degree of sealing between the protective cover and the top and sides of the protected object by setting a protective cover and an inner frame, and a sealing strip between the two, with the sealing strip having an interference fit with the mounting surface of the protected object. Furthermore, a protective base plate is provided at the bottom of the inner frame, and a first ventilation opening is provided between the protective base plate and the protective outer plate. The protective base plate can further protect the protected object from the bottom, providing excellent dust and water resistance, while the first ventilation opening ensures the ventilation and heat dissipation requirements of the protected object. Therefore, the protective device of this utility model has a high protection level while ensuring heat dissipation, and its simple structure and easy manufacturing, without additional energy consumption requirements, greatly saves on operating costs.

[0017] Based on the protective device provided above, this utility model provides an electrical cabinet, comprising:

[0018] The cabinet has second ventilation openings on both sides.

[0019] A cooling system is provided at the second ventilation opening, and the cooling system includes a cooling fan, a filter, filter cotton and louvers arranged from the inside of the cabinet to the outside;

[0020] A protective device for protecting the cooling system, wherein the protective device is any of the protective devices described above.

[0021] In some embodiments, the ventilation area of ​​the first vent on the protective device is:

[0022] S=C*W,

[0023] Wherein, C is the opening width of the first vent, W is the width of the protective cover on the protective device, and S ≥ the actual ventilation area of ​​the filter * the filtration efficiency of the filter cotton;

[0024] The thickness of the protective shield:

[0025] D = (B + C) * cosα,

[0026] Where B is the width of the second base plate and α is the angle between the reverse extension lines of the second base plate and the first base plate on the protective base plate.

[0027] Because the electrical cabinet has the aforementioned protective devices, it directly or indirectly benefits from the good heat dissipation, high protection level, and low operating cost of these devices. Attached Figure Description

[0028] Figure 1 A schematic diagram of an electrical cabinet equipped with protective devices is shown in one embodiment;

[0029] Figure 2A front view of the protective device in one embodiment is shown;

[0030] Figure 3 It shows Figure 2 Sectional view along the middle AA direction;

[0031] Figure 4 A rear view of the protective device in one embodiment is shown;

[0032] Figure 5 It shows Figure 4 Enlarged view at point II;

[0033] Figure 6 An axonometric view of the protective device in one embodiment is shown;

[0034] Figure 7 An axonometric view of the inner frame of the protective device in one embodiment is shown;

[0035] Figure 8 A side view of the protective device in one embodiment is shown;

[0036] Figure 9 A schematic diagram of water flow impact during a waterproof test of the protective device of this application is shown;

[0037] Figure 10 A schematic diagram of water flow impact during a waterproof test of the protective device of this application is shown.

[0038] Figure label:

[0039] 10 is the cabinet body, and 11 is the second ventilation opening;

[0040] 21 is the cooling fan, 22 is the filter, 23 is the filter cotton, and 24 is the louver.

[0041] 31 is a protective cover, 311 is a protective outer plate, 312 is a protective top plate, 313 is a sealing groove, and 314 is a first ventilation opening; 32 is an inner frame, 321 is a cylindrical pin, 322 is an inner frame top plate, 323 is an inner frame side plate, 324 is an inner frame upright plate, and 325 is a protective bottom plate; 33 is a sealing strip; 34 is a fixing bracket, 341 is a slot, and 342 is an installation part;

[0042] 1 indicates the water spray direction for test 1; 2 indicates the water spray direction for test 2; 3 indicates the water spray direction for test 3. Detailed Implementation

[0043] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0044] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0045] See Figures 1 to 8 The protective device provided in this application includes a protective cover 31 and an inner frame 32. The protective cover 31 is provided with a protective outer plate 311 disposed opposite to the mounting surface of the protected object. Figure 3As shown, the inner frame 32 is installed inside the protective cover 31, and the sealing strip 33 is installed between the protective cover 31 and the inner frame 32, protruding from the edges of the protective cover 31 and the inner frame 32, thus achieving an interference fit with the mounting surface of the protected object and achieving a high degree of sealing. The protective cover 31 is installed in conjunction with the protected object to protect the top and sides of the protected object. This protection is mainly achieved through the structure of the protective cover 31 and the sealing strip 33. As for the bottom, a protective base plate 325 is provided at the bottom of the inner frame 32. A first ventilation opening 314 is provided between the protective base plate 325 and the protective outer plate 311, so that while ensuring effective ventilation and heat dissipation of the protected object, the protective base plate 325 can also provide a certain degree of dust and rain protection.

[0046] Taking the application of the protective device to an electrical cabinet as an example, if the protected object is the cooling system located at the second ventilation opening 11 on both sides of the cabinet 10, then the mounting surface of the protected object is the plane where the cooling system is installed. Figure 1 The image shows the side of cabinet 10. The cooling system includes a cooling fan 21, a cooler 22, a filter cotton 23, and louvers 24 installed from the inside of cabinet 10 outwards.

[0047] In one embodiment of this application, such as Figures 2 to 5 As shown, the aforementioned protective cover 31 also includes protective side plates located on both sides of the protective outer plate 311, and a protective top plate 312 located on top of the protective outer plate 311. Figures 6 to 7 As shown, the inner frame 32 includes an inner frame side plate 323 fixedly connected to the protective side plate, an inner frame top plate 322 fixedly connected to the protective top plate 312, and an inner frame upright plate 324 connected to the inner frame side plate 323 and protruding towards the inner circle of the inner frame 32. A sealing groove 313 is provided between the inner frame upright plate 324 and the protective side plate. Figure 6 As shown, the sealing groove 313 is located at the protective side plate and the protective top plate 312, and has a U-shaped structure. The sealing strip 33 is installed in the sealing groove 313 along the U-shaped structure. Preferably, the sealing strip 33 is a T-shaped embedded sealing strip or a U-shaped snap-on sealing strip.

[0048] See Figure 6 and Figure 7 The inner frame upright plate 324 is bent inward relative to the inner frame side plate 323 into the inner frame 32. The inner frame side plate 323 is fixedly connected to the protective side plate, so that after the inner frame 32 and the protective cover 31 are installed, a sealing groove 313 is formed between the inner frame upright plate 324 and the protective side plate. In addition, as Figure 3As shown, the inner frame top plate 322 is fixedly connected to the protective top plate 312, and during installation, it is ensured that a top groove of sealing groove 313 is formed at the top. Specifically, both the inner frame top plate 322 and the protective top plate 312 are bent structures, each including a horizontal part and an inclined part. During fixing, the inclined parts of the inner frame top plate 322 and the inclined parts of the protective top plate 312 are fixed. During fixing, a gap is provided between the horizontal part of the inner frame top plate 322 and the horizontal part of the protective top plate 312, which forms the top groove of sealing groove 313.

[0049] In addition, the protective device of this application also includes a fixing frame 34 that is installed in conjunction with the inner frame 32 to fix the protective device on the mounting surface of the protected object. The inner frame 32 and the fixing frame 34 are detachable.

[0050] like Figure 1 As shown, specifically, the fixing frame 34 in this application can be configured as two, namely a first frame and a second frame. The two frames are respectively installed on both sides of the second ventilation port 11 so that the width between the frames can be adjusted according to the size of the protective cover 31, thereby enabling the fixing frame 34 to adapt to protective covers 31 of different sizes and structures, enabling mass production, greatly improving production efficiency and reducing production costs.

[0051] In this embodiment of the application, the electrical cabinet is used as the protected object, such as Figure 1 As shown, the mounting bracket 34 is fixedly installed around the second ventilation opening 11 of the cabinet 10. Specifically, the mounting bracket 34 is provided with a mounting part 342, and is fixedly installed on the cabinet 10 through the mounting part 342. The mounting part 342 can be fixedly connected to the cabinet 10 by means of screws or welding, etc. For easy disassembly and maintenance, a detachable connection is preferred. If screws are used for fastening, the screw pan head is placed inside the cabinet 10, and a sealing washer is installed between the pan head end face and the inner wall of the cabinet 10 to prevent water from flowing in through the gap of the mounting hole. The threaded part of the screw passes through the mounting hole of the cabinet 10 and the mounting hole of the mounting bracket 34 and is then locked with a lock nut.

[0052] In addition, such as Figure 1 As shown, the mounting bracket 34 is also provided with a slot 341, such as Figure 4 As shown, cylindrical pins 321 are provided on the two inner frame side plates 323 of the inner frame 32. The size and structure of the slots 341 correspond to the cylindrical pins 321. The cylindrical pins 321 are installed in the slots 341 to fix the inner frame 32 relative to the fixing bracket 34, so as to achieve more stable installation and ensure easy disassembly. Preferably, two cylindrical pins 321 are provided on each inner frame side plate 323, and two slots 341 are provided on each side of the fixing bracket 34 to improve the stability of installation. Of course, the specific number of cylindrical pins 321 is determined according to the height of the protective cover 31 to ensure stable installation while facilitating installation.

[0053] Preferably, the aforementioned slot 341 has an upward-facing notch to prevent the cylindrical pin 321 from slipping out after it is installed, thus further ensuring installation stability. When installing the protective cover 31, align the cylindrical pin 321 and the slot 341, and push it in from top to bottom. The sealing strip 33 is compressed on the outside of the cabinet 10 to ensure waterproofing. For disassembly, simply hold the bottom of the protective cover 31 and pull it diagonally upward to separate the protective cover 31 from the fixing bracket 34.

[0054] In one embodiment of this application, such as Figure 1 and Figure 2 As shown, the height H of the protective cover 31 is at least twice the height of the protected object. Specifically, when the protected object is the cabinet 10, H is at least twice the height of the filter 22 in the cooling system. During installation, the bottom of the protective outer plate 311 after the protective cover 31 is installed is required to be at least 0.5 times the height of the filter 22 at the bottom of the filter 22. Figure 1 In this embodiment, W represents the width of the protective cover. W is required to be at least 1.25 times the width of the filter 22 and to be compatible with the thickness of the cabinet 10. The distance between the protective side plate of the protective cover 31 and the cooling system, as well as the distance between the protective base plate 325 and the cooling system, must ensure that even if water flows into the interior of the protective cover, there is a sufficient backflow distance to prevent water from flowing back into the cooling system. This ensures that while completely covering and protecting the cooling system, it further prevents water from entering the cooling system.

[0055] In one embodiment of this application, such as Figure 6 and Figure 7 As shown, the protective base plate 325 is a bent structure, comprising a first base plate perpendicularly connected to the inner frame upright plate 324 of the inner frame 32, and a second base plate connected to the first base plate. The included angle α between the extended lines of the second base plate and the first base plate is [0°, 90°]. Figure 8 As shown. Figure 6 The diagram shows the structure when α = 90°.

[0056] Preferably, the width of the first base plate is A, the width of the second base plate is B, and the thickness of the protective cover 31 is D. In this embodiment, A = D / 2 to D / 3, and B = 10mm to 15mm.

[0057] like Figure 8 As shown, C is the opening width of the second vent 11. The ventilation area S = C * W, and S ≥ the required heat dissipation area. Taking the electrical cabinet as an example, the required heat dissipation area = the actual ventilation area of ​​the selected filter * the filtration efficiency of the filter cotton. The opening width C = S / W, and the thickness D of the protective cover 31 = (B + C) * COSα.

[0058] The protective device provided by this utility model achieves a high degree of sealing between the protective cover 31 and the top and sides of the protected object by setting a protective cover 31 and an inner frame 32, and a sealing strip 33 between the two, with the sealing strip 33 in an interference fit with the mounting surface of the protected object. Furthermore, a protective base plate 325 is provided at the bottom of the inner frame 32, and a second ventilation opening 11 is provided between the protective base plate 325 and the protective outer plate 311. The protective base plate 325 further protects the protected object from the bottom, providing excellent dust and water resistance, while the second ventilation opening 11 ensures the ventilation and heat dissipation requirements of the protected object. Therefore, the protective device of this utility model has a high protection level while ensuring heat dissipation, and its simple structure and easy manufacturing, without additional energy consumption requirements, greatly saves on operating costs.

[0059] Based on the aforementioned protective device, this application also provides an electrical cabinet, comprising: a cabinet body 10, with second ventilation openings 11 provided on both sides of the cabinet body 10; a cooling system disposed at the second ventilation openings 11, and the cooling system including a cooling fan 21, a filter 22, filter cotton 23, and louvers 24 disposed from the inside of the cabinet body 10 to the outside; and a protective device for protecting the cooling system, wherein the protective device is the aforementioned protective device. In a specific embodiment, the fixing frame 34 of the protective device is fixedly installed on the side of the cabinet body 10, and the inner frame 32 is detachably connected to the fixing frame 34.

[0060] In this embodiment, the cooler 22 has a built-in filter cotton 23, with a protection level of IP44 or IP54. If a denser labyrinth-type filter cotton is selected, the protection level can reach IP55. The louvers 24 are detachable and are snap-fitted onto the filter 22. The air outlet angle of the louvers 24 is preferably 45°. The filter 22 may or may not be equipped with a cooling fan 21. The cooling fan 21 is connected to the filter 22 by screws, and the airflow direction is either exhaust or suction. The filter 22 is snap-fitted or screw-fixed to the second ventilation opening 11 of the cabinet 10. The sealing components on the filter 22 seal the filter 22 and the outer wall of the cabinet 10 to prevent water or dust from entering the cabinet 10.

[0061] Because the electrical cabinet has the aforementioned protective devices, it directly or indirectly benefits from the good heat dissipation, high protection level, and low operating cost of these devices.

[0062] like Figure 9 The diagram shows the flow pattern for a waterproof test of the protective device according to UL50E standard. Specifically, a 1-inch water spray pipe was used at 240 L / min, at a distance of 3 m to 3.5 m from the electrical cabinet, with the protective device angled at α = 45°. Water was sprayed at 6 mm / s at each seal and vent. The test results are shown in Test 1 and Test 2.

[0063] Test 1:

[0064] Spray water onto the top, left, and right seals of the protective device. The spraying time for the left and right seals is T1 = H / 6 (seconds), and the spraying time for the top seal is T2 = W / 6 (seconds). The water jet forms a parabola after traveling 3 meters, spraying onto the top, left, and right sides of the protective device. A large amount of water impacts the wall of the seal and bounces back or flows outwards, while the remaining water flows down the seal. After spraying, check that no water has entered the protective cover or the electrical cabinet. Figure 9 Black arrow.

[0065] Test 2:

[0066] Water is sprayed onto the lower seal, flow pattern 1- Figure 9 Purple arrows indicate water that spreads out along the thickness of the electrical cabinet, or is directly horizontal, or is directly bounced off the lower part of the protective cover 31. This part of the water will not damage the protection.

[0067] Flow 2- Figure 9 The yellow arrow indicates that water flowing downstream will not damage the protection.

[0068] Flow Regime 3- Figure 9 The red arrow indicates that the upward-flowing water climbs up and impacts the sealing strip at the first base plate of the protective base plate 325, then turns and flows along the second base plate of the protective base plate 325, but does not enter the protective device.

[0069] Flow Regime 4- Figure 9 The blue arrow indicates that water rebounding diagonally upwards will enter the first vent 314 and impact the inner wall of the protective device. Its flow pattern is as follows:

[0070] Flow pattern 41- Figure 9 The brown arrow indicates that the water flows along the inner wall of the protective cover 31, climbs a certain distance, and then falls back. This flow of water will not enter the filter 22 or the electrical cabinet.

[0071] Flow pattern 42: Rebounding to the surface of the electrical cabinet, the flow patterns in this part of the water are further divided into:

[0072] Flow regime 421- Figure 9 The green arrow indicates that the filter is rising along the surface of the electrical cabinet, reaching a maximum height of 22 where it is blocked by the sealing component and then begins to fall back down.

[0073] Flow Regime 422- Figure 9 Orange arrow - bounces back to the inner wall of protective cover 31, may bounce back to the surface of the electrical cabinet or climb up along the inner wall of protective cover 31, and then repeats flow pattern 421 or flow pattern 422, but the force of flow pattern 421 or flow pattern 422 is weakened until it falls back;

[0074] Flow 5- Figure 9The blue arrow represents the second base plate that bounces off the inner wall of the protective cover 31 and onto the protective base plate 325. The flow pattern in this part can be further divided into:

[0075] Flow pattern 51: After a turn, a portion of the water rushes vertically upwards and then falls back down;

[0076] In flow state 52, some water flows directly down; some water flows onto the surface of the electrical cabinet and becomes flow state 421; and some water bounces back to the inner wall of the protective cover 31 and becomes flow state 422.

[0077] like Figure 10 The diagram shows the flow pattern for a waterproof test of the protective device according to UL50E standard. Specifically, a 240L / min spray rate was used with a 1-inch water hose at a distance of 3m to 3.5m from the electrical cabinet. The protective device was positioned at an angle of 45°, with the water sprayed at a rate of 6mm / s, cutting upwards at the bottom edge of the protective cover 31 towards the sealing area of ​​the inner frame upright plate 324 and the protective base plate 325. The test results are as follows:

[0078] Test 3:

[0079] The water flow patterns under this jetting state can be categorized as follows:

[0080] Flow Regime 1- Figure 10 The purple arrow indicates that the water column will disperse after traveling 3 meters, and some of the water will be blocked by the lower edge of the protective shield 31 and disperse directly.

[0081] Flow 2- Figure 10 The black arrows indicate that the water either spreads out along the thickness of the electrical cabinet or bounces horizontally; this portion of the water will not damage the protection.

[0082] Flow Regime 3- Figure 10 The red arrow indicates that the upward-flowing water impacts the seal at the first base plate of the protective base plate 325, then turns and flows along the second base plate of the protective base plate 325 without entering the protective cover 31.

[0083] Flow Regime 4- Figure 10 The direction indicated by the blue arrow, parallel to the second base plate, splits the water flow into two parts:

[0084] A portion of the flow state 41 is located outside the protective device, and its flow state will change into flow state 2 and flow state 3;

[0085] Part of it is in flow state 42- Figure 7 Orange arrow: Inside the protective shield 31, its flow pattern can be further divided into:

[0086] Flow regime 421- Figure 10 The green arrow indicates that the device climbs along the surface of the electrical cabinet to the sealing component of filter 22, at which point the climb ends and the device begins to fall back down.

[0087] Flow Regime 422- Figure 10 The orange arrow bounces back to the inner wall of the protective shield 31, and its flow pattern can then change to:

[0088] Flow state 4221: It bounces back to the surface of the electrical cabinet, and its flow state changes to flow state 421 or flow state 422;

[0089] Flow pattern 4222- Figure 10 Brown arrow - ascends along the inner wall of shield 31 until it falls back down.

[0090] However, the intensity of both flow state 421 and flow state 422 is reduced.

[0091] The test results show that the protective device of this application has an excellent protective effect.

[0092] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A protective device, characterized in that include: A protective cover (31) is used to cooperate with the protected object to protect the top and sides of the protected object. The protective cover (31) is provided with a protective outer plate (311) that is disposed opposite to the mounting surface of the protected object. An inner frame (32) is installed on the inner ring of the protective cover (31). A sealing strip (33) is provided between the inner frame (32) and the protective cover (31), and the sealing strip (33) protrudes from the edges of the inner frame (32) and the protective cover (31). A protective base plate (325) is provided at the bottom of the inner frame (32), and a first ventilation opening (314) is provided between the protective base plate (325) and the protective outer plate (311).

2. The protective device according to claim 1, characterized in that, The protective cover (31) also includes protective side plates located on both sides of the protective outer plate (311) and a protective top plate (312) located on the top of the protective outer plate (311); the inner frame (32) includes an inner frame side plate (323) fixedly connected to the protective side plate, an inner frame top plate (322) fixedly connected to the protective top plate (312), and an inner frame upright plate (324) connected to the inner frame side plate (323) and protruding toward the inner circle of the inner frame (32). A sealing groove (313) is provided between the inner frame upright plate (324) and the protective side plate.

3. The protective device according to claim 1, characterized in that, It also includes a mounting bracket (34) that is installed in conjunction with the inner frame (32) to fix the protective device on the mounting surface of the protected object, wherein the inner frame (32) and the mounting bracket (34) are detachably installed.

4. The protective device according to claim 3, characterized in that, Cylindrical pins (321) are provided on the two inner frame side plates (323) of the inner frame (32), and the fixing frame (34) is provided with a slot (341) for installing the cylindrical pins (321). The cylindrical pins (321) are installed in the slots (341) to fix the inner frame (32) relative to the fixing frame (34).

5. The protective device according to any one of claims 1 to 4, characterized in that, The protective base plate (325) is a bent structure, which includes a first base plate that is perpendicularly connected to the inner frame upright plate (324) of the inner frame (32), and a second base plate that is connected to the first base plate. The included angle α between the second base plate and the reverse extension line of the first base plate is [0°, 90°].

6. The protective device according to any one of claims 1 to 4, characterized in that, The sealing strip (33) is a T-shaped embedded sealing strip or a U-shaped snap-on sealing strip.

7. The protective device according to claim 5, characterized in that, The width of the first base plate is A, the width of the second base plate is B, and the thickness of the protective cover (31) is D, where A = D / 2 ~ D / 3 and B = 10mm ~ 15mm.

8. The protective device according to claim 3 or 4, characterized in that, The fixing frame (34) is also provided with a mounting part (342) for detachably mounting the protective device on the mounting surface of the protected object.

9. An electrical cabinet, characterized in that include: Cabinet (10), with a second ventilation opening (11) on both sides of the cabinet (10); A cooling system is provided at the second vent (11), and the cooling system includes a cooling fan (21), a filter (22), filter cotton (23) and louvers (24) arranged from the inside of the cabinet (10) to the outside. A protective device for protecting the cooling system, the protective device being the protective device as described in any one of claims 1 to 8.

10. The electrical cabinet according to claim 9, characterized in that, The ventilation area of ​​the first ventilation opening (314) on the protective device is: S=C*W, Wherein, C is the opening width of the first vent (314), W is the width of the protective cover (31) on the protective device, and S≥ the actual ventilation area of ​​the filter (22) * the filtration efficiency of the filter cotton (23); The thickness of the protective shield (31): D = (B + C) * cosα, Where B is the width of the second base plate and α is the angle between the reverse extension lines of the second base plate and the first base plate on the protective base plate (325).

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