Protective cover structure and electric equipment

Abstract

The invention belongs to the technical field of electric facilities, and discloses a protective cover structure and electric equipment, and the protective cover structure is used for covering an electric heating element and comprises a first insulating layer, a fireproof layer and a second insulating layer which are sequentially arranged from inside to outside. The first insulating layer plays an insulating role on the inner side of the protective cover and prevents short circuit of the electric heating element, when the electric heating element is burnt accidentally, the fireproof layer can isolate flames, the second insulating layer on the outer layer further plays a role in electricity prevention and heat insulation, and even if the electric heating element is short-circuited in the protective cover structure, the electric heating element is prevented from being damaged due to the existence of the second insulating layer. And the electric leakage phenomenon is avoided, and the use safety is improved. The melting point of the fireproof layer is higher than that of the first insulating layer, the fireproof performance of the whole protective cover structure can be improved, and even if the first insulating layer is accidentally burnt, the fireproof layer can effectively prevent flames from escaping. The protective cover structure can play a good role in fire prevention and electricity prevention on the covered electric heating element, is high in strength and reliability, and meets the long-term use requirement.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical facilities, and in particular to a protective cover structure and electrical equipment. Background Art

[0002] Electrical equipment usually has high-voltage electrical parts, such as electrical cabinets, electrical components in servers, water heaters, computers and other household appliances. After long-term operation, more heat will be generated, and the working temperature will continue to rise, which is very likely to cause safety accidents such as fire and electric shock. Therefore, it is necessary to use a protective cover structure to cover the high-voltage electrical parts to achieve fire and electric shock protection functions.

[0003] In the prior art, there are usually three types of fire and electricity prevention measures for high-voltage electrical parts. The first is to use a shield made of high flame retardant plastic material for shielding. In order to make the flame retardant performance of high flame retardant plastic reach UL94V-0 or even 5VB, 5VA grade requirements, high flame retardant plastic needs to be set to a sufficient thickness to achieve it, and the high flame retardant plastic itself is expensive, and the overall cost of fire and electricity prevention is high. The second is to use a shield made of metal material for shielding. Although the metal shield has good thermal conductivity and heat dissipation performance and is non-flammable, it can provide the best flame protection, but its anti-conductivity performance is poor, and it needs to be separated from the high-voltage electrical part by a certain distance to ensure that it neither causes a short circuit in the high-voltage electrical part nor leads the dangerous voltage to the human body. If necessary, it is also necessary to consider grounding it. The anti-electrical measures are complicated and cumbersome. Moreover, due to the existence of the interval between the metal shield and the high-voltage electrical part, the volume of the metal shield needs to be set larger, occupying more space, thereby increasing the volume of the electrical equipment, which is not conducive to miniaturization design. In addition, the metal shield also has defects such as easy rust and corrosion, which is not conducive to long-term use. The third type is a double-layer protective structure consisting of an inner layer of plastic and an outer layer of metal, which has both fire and electrical resistance. Specifically, a layer of metal is fixed on the periphery of the plastic cover by claws to form the double-layer structure. On the one hand, the connection between the plastic cover and the metal layer is complicated and cumbersome, difficult to assemble, and has low production efficiency; on the other hand, if the inner layer of the plastic cover is burned, only the outer layer of the metal layer is left for protection. At this time, the electrical protection function of the protective structure has disappeared with the burning of the plastic cover, so it is very easy to produce the risk of short circuit in high-voltage electrical parts, which in turn leads to leakage and threatens the personal safety of users.

[0004] Therefore, based on the above problems, there is an urgent need for a protective cover structure and electrical equipment to solve the above problems. Summary of the invention

[0005] One purpose of the present invention is to provide a protective cover structure which has good fire and electric shock protection effects on high-voltage electrical parts, has high strength, low manufacturing cost, high reliability, and meets long-term use requirements.

[0006] Another object of the present invention is to provide an electrical device in which high-voltage electrical parts can be effectively protected to prevent fire, leakage and the like, thereby improving safety of use.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, a protective cover structure is provided, which is configured to cover an electric heating element. The protective cover structure includes a first insulating layer, a fireproof layer and a second insulating layer arranged in sequence from the inside to the outside, and the melting point of the fireproof layer is higher than that of the first insulating layer.

[0009] As an optional solution of the protective cover structure provided by the present invention, a thermosetting heat-insulating layer is provided between the first insulating layer and the fireproof layer;

[0010] And / or, a thermosetting heat-insulating layer is provided between the second insulating layer and the fireproof layer.

[0011] As an optional solution of the protective cover structure provided by the present invention, a receiving cavity is provided between the first insulating layer and the fireproof layer and / or between the second insulating layer and the fireproof layer, and the thermosetting thermal insulation layer is injection molded in the receiving cavity.

[0012] As an optional solution of the protective cover structure provided by the present invention, an electromagnetic radiation protection layer is provided between the first insulating layer and the fireproof layer and / or between the second insulating layer and the fireproof layer.

[0013] As an optional solution of the protective cover structure provided by the present invention, the protective cover structure is provided with at least one heat dissipation vent, the heat dissipation vent passes through the first insulating layer, the fireproof layer and the second insulating layer, and the size of the heat dissipation vent is smaller than the size threshold.

[0014] As an optional solution of the protective cover structure provided by the present invention, a thermal expansion layer is provided in the heat dissipation vent, and the thermal expansion layer is used to expand and block the heat dissipation vent when the temperature in the protective cover structure reaches a temperature threshold.

[0015] As an optional solution of the protective cover structure provided by the present invention, the protective cover structure is provided with an automatic pressure relief structure.

[0016] As an optional solution of the protective cover structure provided by the present invention, a smoke detection module is arranged in the protective cover structure, and the smoke detection module is used to detect smoke and / or odor generated after the first insulating layer is burned.

[0017] As an optional solution of the protective cover structure provided by the present invention, the protective cover structure is provided with a wiring cavity penetrating the first insulating layer, the fireproof layer and the second insulating layer, and the wiring cavity is used for passing the wires connected to the electric heating element.

[0018] As an optional solution of the protective cover structure provided by the present invention, a wiring claw is connected to the outer side of the second insulating layer, and the wiring claw can clamp the wire connected to the electric heating element and guide the direction of the wire.

[0019] As an optional solution of the protective cover structure provided by the present invention, a side of the first insulating layer facing away from the fireproof layer is coated with a heat-insulating coating; and / or,

[0020] The side of the second insulating layer facing away from the fireproof layer is coated with heat insulation paint.

[0021] As an optional solution of the protective cover structure provided by the present invention, the first insulating layer, the fireproof layer and the second insulating layer are integrally formed.

[0022] As an optional solution of the protective cover structure provided by the present invention, the first insulating layer and the second insulating layer are made of the same plastic material, the fireproof layer is made of metal, and the fireproof layer is integrally injection molded with the first insulating layer and the second insulating layer; or,

[0023] The first insulating layer and the second insulating layer are made of different materials, and the fireproof layer is bonded to the first insulating layer and the second insulating layer.

[0024] In a second aspect, an electrical device is provided, comprising at least one electric heating element, each of which is provided with a protective cover structure as described above.

[0025] As an optional solution of the electrical equipment provided by the present invention, the electrical equipment also includes a mounting structure, the electric heating element is arranged on the mounting structure, and the protective cover structure is connected to the mounting structure by magnetic attraction or by a snap structure or by a threaded structure.

[0026] Beneficial effects of the present invention:

[0027] The present invention provides a protective cover structure, wherein the first insulating layer is used to insulate the inner side of the protective cover, effectively preventing the electric heating element from short-circuiting. When the electric heating element accidentally burns, the fireproof layer can isolate the flame, and the outermost second insulating layer further plays an anti-electric and heat-insulating role. Even if the electric heating element short-circuits in the protective cover structure, due to the existence of the second insulating layer, no leakage will occur, thereby improving the safety of use. The melting point of the fireproof layer is higher than that of the first insulating layer, which can improve the fireproof performance of the entire protective cover structure. Even if the first insulating layer inside is accidentally burned, the fireproof layer in the middle can effectively prevent the flame from escaping. In addition, there is no need to retain a large gap between the first insulating layer and the electric heating element, so that the volume of the entire protective cover structure can be reduced, the occupied space is reduced, and it is conducive to the miniaturization design of electrical equipment. The protective cover structure can have a good fireproof and anti-electric effect on the covered electric heating element, and has high strength and reliability, meeting the requirements of long-term use.

[0028] The present invention also provides an electrical device, wherein the electric heating element inside the electrical device is protected by the protective cover structure to prevent fire, electric leakage and the like, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a first protective cover structure provided by the prior art;

[0030] Figure 2 is a schematic diagram of a second protective cover structure provided by the prior art;

[0031] Figure 3 is a schematic diagram of a third protective cover structure provided by the prior art;

[0032] Figure 4 is a first view of a protective cover structure provided by a specific embodiment of the present invention;

[0033] Figure 5 is a second view of the protective cover structure provided by a specific embodiment of the present invention;

[0034] Figure 6 is a third view of the protective cover structure provided by a specific embodiment of the present invention;

[0035] Figure 7 yes Figure 6 A partial cross-sectional view of

[0036] Figure 8 This is a working diagram of the smoke detection module.

[0037] In the figure:

[0038] 10. Plastic cover; 20. Metal cover; 30. Double-layer protection structure; 301. Inner plastic layer; 302. Outer metal layer;

[0039] 1. First insulation layer; 2. Fireproof layer; 3. Second insulation layer; 4. Thermosetting heat insulation layer; 5. Smoke detection module; 6. Wiring claw; 7. Control module; 8. Warning module;

[0040] 51. Smoke detection parts; 52. Odor detection parts;

[0041] 61. straight portion; 62. bent portion;

[0042] 100. Electric heating element. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0047] Electrical equipment usually has an electric heating element 100, which is a high-voltage electrical part, such as an electric heating element 100 in an electric cabinet or server, a computer board of a water heater, a computer or other household appliance, etc. The electric heating element 100 will generate more heat after a long period of operation, and the working temperature will continue to rise, which is very likely to cause safety accidents such as fire and electric shock. The electric heating element 100 also includes the terminal connection part of a high-power appliance (such as plug-in, crimping, welding, etc.), and a poor terminal connection will cause heat and combustion. Therefore, it is necessary to use a protective cover structure to cover the high-voltage electrical part to achieve fire and electric shock protection functions.

[0048] There are three types of protective cover structures commonly used in the prior art.

[0049] like Figure 1 As shown, the first protective cover structure is a plastic cover 10, which is made of highly flame-retardant plastic. In order to make the flame retardant performance of the highly flame-retardant plastic reach the requirements of UL94V-0 or even 5VB, 5VA grades, the plastic cover 10 needs to be set to a sufficient thickness to achieve this. However, the highly flame-retardant plastic itself is expensive, and the overall cost of fire and electricity protection is high. Since the highly flame-retardant plastic has insulation properties, the reserved gap H1 between the plastic cover 10 and the electric heating element 100 can be set to be smaller.

[0050] like Figure 2 As shown, the second protective cover structure is a metal cover shell 20 made of metal material. Although the metal cover shell 20 has good heat conduction and heat dissipation performance and is non-flammable, and can provide the best flame protection, its anti-conductivity performance is poor, and it needs to be separated from the high-voltage electrical parts by a certain distance to ensure that it neither causes a short circuit in the high-voltage electrical parts nor leads the dangerous voltage to the human body. If necessary, it should also be considered to be grounded, and the anti-electrical measures are complicated and cumbersome. Moreover, due to the existence of the interval between the metal cover shell 20 and the high-voltage electrical parts, the volume of the metal cover shell 20 needs to be set larger, occupying more space, thereby increasing the volume of the electrical equipment, which is not conducive to miniaturization design. The gap H2 that needs to be reserved between the metal cover shell 20 and the electric heating element 100 is significantly larger than the gap H1 between the plastic cover shell 10 and the electric heating element 100. In addition, the metal shield also has defects such as easy to rust and corrode, which is not conducive to long-term use.

[0051] like Figure 3As shown, the third protective cover structure is a double-layer protective structure 30 composed of an inner plastic layer 301 and an outer metal layer 302, which has both fire and electrical resistance. Specifically, a layer of metal is fixed on the periphery of the plastic shell by claws to form the double-layer protective structure 30. On the one hand, the connection between the plastic shell and the metal layer is complicated and cumbersome, difficult to assemble, and low production efficiency; on the other hand, if the inner plastic shell is burned, only the outer metal layer is left for protection. At this time, the electrical protection function of the protective structure has disappeared with the burning of the plastic shell, so it is very easy to produce the risk of short circuit in high-voltage electrical parts, which in turn leads to leakage and threatens the personal safety of users.

[0052] Based on the above problems, this embodiment provides a protective cover structure for covering the electric heating element 100, which can provide good fire and electricity protection for the covered electric heating element 100, and has high strength, low manufacturing cost, high reliability, and meets the requirements of long-term use.

[0053] like Figure 4 As shown, the protective cover structure provided in this embodiment includes a first insulating layer 1, a fireproof layer 2 and a second insulating layer 3 which are arranged in sequence from the inside to the outside, and the melting point of the fireproof layer 2 is higher than that of the first insulating layer 1.

[0054] The first insulating layer 1 is used to insulate the inner side of the protective cover, effectively preventing the electric heating element 100 from short-circuiting. When the electric heating element 100 accidentally burns, the fireproof layer 2 can isolate the flame. The outermost second insulating layer 3 further plays an anti-electric and heat-insulating role. Even if the electric heating element 100 short-circuits in the protective cover structure, due to the existence of the second insulating layer 3, no leakage will occur, thereby improving the safety of use. The melting point of the fireproof layer 2 is higher than that of the first insulating layer 1, which can improve the fireproof performance of the entire protective cover structure. Even if the first insulating layer 1 inside is accidentally burned, the fireproof layer 2 in the middle can effectively prevent the flame from escaping. In addition, there is no need to retain a large gap between the first insulating layer 1 and the electric heating element 100, so that the volume of the entire protective cover structure can be reduced, reducing the occupied space, which is conducive to the miniaturization design of electrical equipment. The protective cover structure can have a good fireproof and anti-electric effect on the electric heating element 100 covered, and has high strength and reliability, meeting the requirements of long-term use.

[0055] In this embodiment, optionally, the first insulating layer 1, the fireproof layer 2 and the second insulating layer 3 are integrally formed. On the one hand, it can simplify the connection and assembly process and improve production efficiency. On the other hand, the one-piece molding method makes the protective cover structure have higher strength and better fireproof and heat-insulating properties to meet the requirements of long-term use.

[0056] For example, in this embodiment, the first insulating layer 1 and the second insulating layer 3 are both made of plastic, and the two are made of the same material of plastic, and the fireproof layer 2 is made of metal. The fireproof layer 2 is integrally injection molded with the first insulating layer 1 and the second insulating layer 3. That is, through the insert injection molding technology, the metal fireproof layer 2 is directly injected into the plastic part as an insert, avoiding multiple installation processes, and at the same time achieving fireproof and electrical resistance, as well as having high strength.

[0057] In other embodiments, the first insulating layer 1 and the second insulating layer 3 may be made of different materials, for example, different types of plastics. In this case, the fireproof layer 2 may be bonded to the first insulating layer 1 and the second insulating layer 3. To ensure the performance of the fireproof layer 2, the fireproof layer 2 is still made of metal.

[0058] In this embodiment, the anti-electric performance is achieved by the first insulating layer 1 and the second insulating layer 3 of plastic material, and the thickness of the first insulating layer 1 and the second insulating layer 3 needs to be set according to the insulation strength to be achieved. For example, if only additional insulation is required, the first insulating layer 1 of the inner layer should pass the relevant electrical strength test and the thickness should not be less than 1mm. If double insulation is required, the first insulating layer 1 of the inner layer should pass the relevant electrical strength test and the thickness should not be less than 1mm, and the second insulating layer 3 of the outer layer should pass the relevant electrical strength test and the thickness should not be less than 1mm. If reinforced insulation is required, the first insulating layer 1 of the inner layer should pass the relevant electrical strength test and the thickness should not be less than 2mm, or the second insulating layer 3 of the outer layer should pass the relevant electrical strength test and the thickness should not be less than 2mm.

[0059] Optionally, the first insulating layer 1 and the second insulating layer 3 are made of UL94V-2 grade plastics with certain flame retardant properties. The fireproof layer 2 only needs to be fireproof, and its strength can be supplemented by the first insulating layer 1 and the second insulating layer 3. Therefore, the fireproof layer 2 can be made of very thin metal materials, but metals such as aluminum with low melting points cannot be used. Exemplarily, the fireproof layer 2 can be made of inexpensive metals with high melting points, such as iron, steel, etc. The strength problems, rust problems, and conductivity problems of the fireproof layer 2 can be solved by the first insulating layer 1 and the second insulating layer 3 coated on the outside of the fireproof layer 2.

[0060] Furthermore, since the second insulating layer 3 is made of plastic, text, images and other contents can be easily formed outside the second insulating layer 3 .

[0061] In order to deal with the situation that some electric heating elements 100 themselves generate a lot of heat and further enhance the fire and electric shock prevention effects, the inner first insulating layer 1 and the outer second insulating layer 3 can be replaced with thermosetting materials, or, as Figure 6 and Figure 7As shown, a thermosetting thermal insulation layer 4 is arranged between the first insulation layer 1 and the fireproof layer 2, and a thermosetting thermal insulation layer 4 is arranged between the second insulation layer 3 and the fireproof layer 2. The thermosetting thermal insulation layer 4 is made of thermosetting plastic. Thermosetting plastic has good heat resistance, flame retardancy and electrical insulation properties, further improving the fire and electrical protection effects.

[0062] Exemplarily, the thermosetting plastic is epoxy resin or the like.

[0063] Considering the molding process of plastic, in this embodiment, during the injection molding process of the fireproof layer 2, the first insulating layer 1 and the second insulating layer 3, a structure for accommodating epoxy resin is arranged between the first insulating layer 1 and the fireproof layer 2 and between the second insulating layer 3 and the fireproof layer 2. The structure is used to form a accommodating cavity. After the fireproof layer 2, the first insulating layer 1 and the second insulating layer 3 are molded, epoxy resin is poured into the accommodating cavity to form a thermosetting thermal insulation layer 4.

[0064] Optionally, the first insulating layer 1 is coated with a heat-insulating paint on one side facing away from the fireproof layer 2; and / or the second insulating layer 3 is coated with a heat-insulating paint on one side facing away from the fireproof layer 2, so as to further improve the flame retardant and heat-insulating effects of the protective cover structure. After the fireproof layer 2, the first insulating layer 1 and the second insulating layer 3 are injection molded, the heat-insulating paint can be applied to the first insulating layer 1 and / or the second insulating layer 3.

[0065] Optionally, an anti-electromagnetic radiation layer is provided between the first insulating layer 1 and the fireproof layer 2 and / or between the second insulating layer 3 and the fireproof layer 2. The provision of the anti-electromagnetic radiation layer ensures that the electric heating element 100 inside the protective cover and the electronic devices outside the protective cover do not affect each other, ensuring that the electric heating element 100 will not be disturbed by electromagnetic radiation, and ensuring the normal operation of the electric heating element 100.

[0066] Optionally, in order to ensure that the air pressure inside the protective cover structure is normal during the operation of the electric heating element 100, at least one heat dissipation vent is provided on the protective cover structure, and the heat dissipation vent runs through the first insulating layer 1, the fireproof layer 2 and the second insulating layer 3, which can not only achieve a certain heat dissipation effect, but also ensure that the pressure inside and outside the protective cover structure is equal, thereby preventing the electric heating element 100 from being unable to work normally due to being subjected to a large pressure. Furthermore, the size of the heat dissipation vent is smaller than the size threshold, which can achieve a heat dissipation effect while also preventing flames from bursting out when the protective cover structure burns inside. The size threshold is set according to the parameters of the protective cover structure and the calorific value of the electric heating element 100, for example, 5 mm, 1 cm, etc., that is, the diameter of the heat dissipation vent is smaller than 5 mm, 1 cm, etc.

[0067] Furthermore, a heat expansion layer is provided in the heat dissipation vents, and the heat expansion layer is used to expand and block the heat dissipation vents when the temperature in the protective cover structure reaches a temperature threshold. The temperature threshold is the temperature that can be reached after combustion occurs in the protective cover structure, such as 120°C, 150°C, 200°C, etc. As the temperature in the protective cover structure gradually rises, the volume of the heat expansion layer gradually increases. After reaching the temperature threshold, the heat dissipation vents are completely blocked to prevent flames from escaping from the heat dissipation vents, thereby improving safety.

[0068] Exemplarily, the heat expansion layer is an intumescent fire retardant adhesive.

[0069] Furthermore, an automatic pressure relief structure is provided on the protective cover structure. The automatic pressure relief structure is used to maintain the internal and external pressure balance of the protective cover structure. Specifically in this embodiment, the automatic pressure relief structure automatically opens when the temperature inside the protective cover structure reaches the temperature threshold. At this time, since the heat expansion layer expands and blocks the heat dissipation vents, the pressure balance can no longer be maintained through the heat dissipation vents. The automatic pressure relief structure can be used to relieve pressure inside the protective cover structure to prevent overheating and explosion.

[0070] Exemplarily, the automatic pressure relief structure is a pressure relief valve.

[0071] See also Figure 6 and Figure 8 A smoke detection module 5 is provided in the protective cover structure. The smoke detection module 5 is used to detect the smoke and / or smell generated after the first insulating layer 1 burns, so as to know whether a burning phenomenon occurs in the protective cover structure. Furthermore, a control module 7 and a warning module 8 are provided on the electrical equipment. When the smoke detection module 5 detects the smoke and / or smell generated after the first insulating layer 1 burns, a signal is sent to the control module 7. After the control module 7 recognizes the signal, it sends an instruction to the warning module 8, so that the warning module 8 sends a warning signal to remind relevant personnel that the electric heating element 100 has overheated and burned, so that control measures can be taken in time to prevent more serious safety accidents.

[0072] Exemplarily, the warning module 8 may include a warning light, a buzzer, and the like.

[0073] For example, see Figure 8 The smoke detection module 5 includes a smoke detection element 51 and an odor detection element 52. The first insulating layer 1 is plastic, which will produce smoke and pungent odor after burning. The smoke detection element 51 is used to detect the smoke generated by the burning of the first insulating layer 1, and the odor detection element 52 is used to detect the odor generated by the burning of the first insulating layer 1. The two are detected together, which has higher reliability. When one of them is damaged, the other can still serve as a detection prompt.

[0074] Optionally, the protective cover structure is provided with a wiring cavity that passes through the first insulating layer 1, the fireproof layer 2 and the second insulating layer 3, and the wiring cavity is used to pass the wires connected to the electric heating element 100. The electric heating element 100 is likely to be connected to external electronic devices through wires, and the wiring cavity can make the wire arrangement more convenient. The wiring cavity can be opened later, which is convenient for processing.

[0075] Further, see Figure 5 and Figure 6 The outer side of the second insulating layer 3 is connected with a wiring claw 6, which can fix the wire connected to the electric heating element 100 and guide the direction of the wire. Specifically, the wire led out of the wiring cavity can be fixed and guided by the wiring claw 6.

[0076] See also Figure 5 The wiring claw 6 includes a straight portion 61 and a bent portion 62 connected to each other, and the straight portion 61 and the bent portion 62 are both provided with a wire clamping structure for clamping the wire. The straight portion 61 can be aligned with the wiring cavity, and the wire led out of the wiring cavity can be first clamped by the straight portion 61 to avoid forming a sharp corner when leading out and prevent the wire from being broken. The bent portion 62 is used to guide the wire, and its bending direction is set according to the direction of the wire. The present embodiment also provides an electrical device, including at least one electric heating element 100, and each electric heating element 100 is provided with a protective cover structure as described above. Since the electric heating element 100 is covered and protected by the above-mentioned protective cover structure, it can effectively prevent fire, leakage and other phenomena, thereby improving the safety of use.

[0077] Furthermore, the electrical equipment also includes a mounting structure, the electric heating element 100 is arranged on the mounting structure, and the protective cover structure is connected to the mounting structure to stably cover the electric heating element 100.

[0078] As a first embodiment, the protective cover structure is magnetically connected to the mounting structure, and installation and disassembly are convenient. For example, a circle of magnetic sheets is arranged on the mounting structure, and a circle of iron sheets is arranged at the bottom of the protective cover structure, and the magnetic sheets are magnetically attracted to the iron sheets. Alternatively, if the thickness of the fireproof layer 2 is sufficient, the fireproof layer 2 can be directly magnetically attracted to the magnetic sheets.

[0079] As a second embodiment, the protective cover structure can be connected to the mounting structure through a buckle structure, which is firmly and securely mounted and easy to disassemble. As a third embodiment, the protective cover structure can also be connected to the mounting structure through a threaded structure.

[0080] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The protective cover structure is characterized by: The protective cover structure is configured to cover an electric heating element (100), and comprises a first insulating layer (1), a fireproof layer (2), and a second insulating layer (3) which are arranged in sequence from the inside to the outside, and the melting point of the fireproof layer (2) is higher than that of the first insulating layer (1).

2. The protective cover structure according to claim 1, characterized in that: A thermosetting heat-insulating layer (4) is provided between the first insulating layer (1) and the fireproof layer (2); And / or, a thermosetting heat-insulating layer (4) is provided between the second insulating layer (3) and the fireproof layer (2).

3. The protective cover structure according to claim 2, characterized in that: A receiving cavity is provided between the first insulating layer (1) and the fireproof layer (2) and / or between the second insulating layer (3) and the fireproof layer (2), and the thermosetting heat-insulating layer (4) is injection-molded in the receiving cavity.

4. The protective cover structure according to claim 1, characterized in that: An electromagnetic radiation protection layer is provided between the first insulating layer (1) and the fireproof layer (2) and / or between the second insulating layer (3) and the fireproof layer (2).

5. The protective cover structure according to claim 1, characterized in that: The protective cover structure is provided with at least one heat dissipation vent hole, the heat dissipation vent hole passes through the first insulating layer (1), the fireproof layer (2) and the second insulating layer (3), and the size of the heat dissipation vent hole is smaller than a size threshold.

6. The protective cover structure according to claim 5, characterized in that: A heat expansion layer is arranged in the heat dissipation vent hole, and the heat expansion layer is used to expand and block the heat dissipation vent hole when the temperature in the protective cover structure reaches a temperature threshold.

7. The protective cover structure according to claim 6, characterized in that: The protective cover structure is provided with an automatic pressure relief structure.

8. The protective cover structure according to any one of claims 1 to 7, characterized in that: A smoke detection module (5) is arranged in the protective cover structure, and the smoke detection module (5) is used to detect smoke and / or odor generated after the first insulating layer (1) is burned.

9. The protective cover structure according to any one of claims 1 to 7, characterized in that: The protective cover structure is provided with a wiring cavity that passes through the first insulating layer (1), the fireproof layer (2) and the second insulating layer (3), and the wiring cavity is used for passing the wires connected to the electric heating element (100).

10. The protective cover structure according to any one of claims 1 to 7, characterized in that: The outer side of the second insulating layer (3) is connected to a wiring claw (6), and the wiring claw (6) can clamp the wire connected to the electric heating element (100) and guide the direction of the wire.

11. The protective cover structure according to any one of claims 1 to 7, characterized in that: The side of the first insulating layer (1) facing away from the fireproof layer (2) is coated with a heat-insulating coating; and / or, The side of the second insulating layer (3) facing away from the fireproof layer (2) is coated with a heat-insulating coating.

12. The protective cover structure according to any one of claims 1 to 7, characterized in that: The first insulating layer (1), the fireproof layer (2) and the second insulating layer (3) are integrally formed.

13. The protective cover structure according to any one of claims 1 to 7, characterized in that: The first insulating layer (1) and the second insulating layer (3) are both made of the same plastic material, the fireproof layer (2) is made of metal, and the fireproof layer (2) is integrally injection-molded with the first insulating layer (1) and the second insulating layer (3); or, The first insulating layer (1) and the second insulating layer (3) are made of different materials, and the fireproof layer (2) is bonded to the first insulating layer (1) and the second insulating layer (3).

14. Electrical equipment, characterized in that: It comprises at least one electric heating element (100), and each of the electric heating elements (100) is provided with a protective cover structure according to any one of claims 1 to 13.

15. The electrical equipment according to claim 14, characterized in that: The electrical equipment also comprises a mounting structure, the electric heating element (100) is arranged on the mounting structure, and the protective cover structure is connected to the mounting structure by magnetic attraction or by a snap-fit ​​structure or by a threaded structure.

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