A cable fire early warning monitoring device

Abstract

The present invention relates to the technical field of waste-derived fuel power generation system, and discloses a cable fire early warning monitoring device, which includes an insertion shell, an embedded shell, a monitoring device and a control system; the insertion shell and the embedded shell are both used to be connected to the cable, the insertion shell is connected to the embedded shell, and the insertion shell, the embedded shell and the cable are jointly surrounded to form a sealed cavity; the monitoring device is installed on the insertion shell and / or the embedded shell, and is used to monitor the temperature of the sealed cavity, the monitoring device includes a monitoring shell, a shape memory alloy and a first sensor connected to the shape memory alloy, the shape memory alloy and the first sensor are both located in the monitoring shell, the shape memory alloy is adhered to the inner wall of the monitoring shell, the first sensor is adhered to the cable, the first sensor is connected to the control system signal, and is used to sense the stress change of the shape memory alloy and transmit the data to the control system. The present invention can help staff to monitor the cable condition in time.

Description

Technical Field

[0001] The invention relates to the technical field of garbage derived fuel power generation system, in particular to a cable fire prevention early warning monitoring device. Background Art

[0002] The technology of recycling garbage and sludge is gaining more and more attention. Both garbage and sludge have certain calorific value, and the heat released by burning them can be recycled and used to generate electricity. Refuse-derived fuel (RDF) is a fuel made by crushing, sorting, drying, adding agents, and compressing combustible garbage. The birth of Refuse-derived fuel has brought vitality to garbage energy and has become a new growth point in the field of garbage utilization.

[0003] During the operation of the RDF power generation system, if the power cable fails or even burns, it will cause huge economic losses to the RDF power generation system. Therefore, a device that can monitor the cable status at any time is needed. Summary of the invention

[0004] The purpose of the present invention is to provide a cable fire early warning monitoring device, which can help staff to monitor the cable conditions in time.

[0005] In order to achieve the above-mentioned object, the present invention provides a cable fire early warning monitoring device, which includes an insertion shell, an embedded shell, a monitoring device and a control system;

[0006] The insertion shell and the embedded shell are both used to be connected to the cable, the insertion shell is connected to the embedded shell, and the insertion shell, the embedded shell and the cable are jointly enclosed to form a sealed cavity;

[0007] The monitoring device is mounted on the insertion shell and / or the embedded shell and is used to monitor the temperature of the sealed cavity. The monitoring device includes a monitoring shell, a shape memory alloy and a first sensor connected to the shape memory alloy. The shape memory alloy and the first sensor are both located in the monitoring shell.

[0008] The shape memory alloy is adhered to the inner wall of the monitoring housing, and the first sensor is adhered to the cable.

[0009] Or, the shape memory alloy is adhered to the cable, and the first sensor is adhered to the inner wall of the monitoring housing,

[0010] The first sensor is connected to the control system signal, and is used to sense the stress change of the shape memory alloy and transmit data to the control system.

[0011] Optionally, the monitoring device further comprises an expansion body and a second sensor connected to the expansion body, and the expansion body and the second sensor are both located in the monitoring housing;

[0012] The expansion body is adhered to the inner wall of the monitoring housing, and the second sensor is adhered to the cable.

[0013] Or, the expansion body is adhered to the cable, and the second sensor is adhered to the inner wall of the monitoring housing,

[0014] The second sensor is connected to the control system signal, and is used to sense the stress change of the expansion body and transmit data to the control system.

[0015] Optionally, the monitoring device is provided in both the insertion shell and the embedding shell.

[0016] Optionally, the monitoring device inserted into the shell is defined as a first monitoring device, and the monitoring device embedded in the shell is defined as a second monitoring device;

[0017] The control system includes a first controller and a second controller electrically connected to the first controller;

[0018] The first controller is disposed in the insertion housing and is signal-connected to the first monitoring device;

[0019] The second controller is disposed in the embedded housing and is signal-connected to the second monitoring device.

[0020] Optionally, the width of the first monitoring device in the axial direction thereof is defined as a, and the width of the second monitoring device in the axial direction thereof is defined as b, then a=2b;

[0021] Define the width of the first controller in the axial direction as c, and define the width of the second controller in the axial direction as d, then c=2d.

[0022] Optionally, it further includes a first water pipe, the water outlet of the first water pipe is arranged in the sealed cavity, a first valve body is installed on the first water pipe, and the first valve body is electrically connected to the control system.

[0023] Optionally, a second water pipe is provided in the sealed cavity, a second valve body is installed on the second water pipe, and the second valve body is electrically connected to the control system.

[0024] Optionally, a first fireproof blocking material layer is provided on the side of the monitoring device away from the sealed cavity, a second fireproof blocking material layer is provided on the side of the monitoring device close to the sealed cavity, and a waterproof layer is provided on the side of the second fireproof blocking material layer close to the sealed cavity.

[0025] Optionally, an insertion portion is provided on the side of the insertion shell opposite to the embedded shell, and an embedding portion is provided on the side of the embedded shell opposite to the insertion shell. The insertion portion and the embedding portion are arranged opposite to each other and positioned together. The insertion portion is inserted into the embedding portion to form the sealed cavity, and a sealing member is provided on the inner wall of the embedding portion on one side relative to the insertion portion.

[0026] Optionally, a lip-shaped sealing assembly is further included, which includes a frame, a sealing body and an elastic member, wherein the frame is fixedly connected to the top side of the inner wall of the embedded part, the sealing body is connected to the top of the insertion part, the sealing body is sleeved outside the frame, and the elastic member is arranged between the sealing body and the frame.

[0027] Compared with the prior art, the cable fire early warning monitoring device provided by the present invention has the following beneficial effects: the insert shell, the embedded shell and the cable of the present invention are arranged to form a sealed cavity. When a fire or failure occurs in the cable, the temperature in the sealed cavity rises, causing the shape memory alloy in the monitoring device arranged in the insert shell and / or the embedded shell to shrink due to heat, and the pressure acting on the first sensor increases. The first sensor transmits the pressure change signal to the control system, and the control system then issues a warning signal. The cable fire early warning monitoring device utilizes the property of shape memory metal shrinking due to heat, and connects the first sensor for detecting pressure changes to the shape memory metal. It can provide timely feedback and early warning on the temperature of the sealed cavity, improve the cable fault monitoring capability, and help the staff to understand the cable condition in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the connection structure between the cable fire early warning monitoring device and the cable according to an embodiment of the present invention;

[0029] Figure 2 is a stereoscopic diagram of a cable fire early warning monitoring device according to an embodiment of the present invention;

[0030] Figure 3 is a structural schematic diagram of a cable fire early warning monitoring device according to an embodiment of the present invention;

[0031] Figure 4 is a schematic structural diagram of an insertion housing according to an embodiment of the present invention;

[0032] Figure 5 is a schematic structural diagram of a lip seal assembly according to an embodiment of the present invention;

[0033] Figure 6 It is a connection block diagram of a control system, a control room, a first sensor, and a second sensor according to an embodiment of the present invention.

[0034] In the figure, 100, cable; 200, cable fire early warning monitoring device; 201, insert shell; 202, embed shell; 203, sealed cavity; 204, monitoring device; 204a, first monitoring device; 204b, second monitoring device; 2041, monitoring shell; 2042, shape memory alloy; 2043, first sensor; 2044, expansion body; 2045, second sensor; 205, control system; 2051, first controller; 2052, second controller; 206, lip seal Component; 2061, skeleton; 2062, sealing body; 2063, elastic member; 207, first water pipe; 208, second water pipe; 209, first fireproof blocking material layer; 210, second fireproof blocking material layer; 211, waterproof layer; 212, insertion part; 213, embedding part; 214, sealing member; 215, mounting pad; 216, protrusion; 217, deformation body; 218, deformation groove; 219, concave cavity; 220, first valve body; 221, second valve body; 300, control room; 400, cable trench. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "up", "down", "horizontal", "top", "bottom", "inside" and "outside" used in the present invention to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] It should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] like Figure 1 As shown, the waste-derived fuel power generation system has a control room 300, and a temperature sensor (not shown in the figure) is arranged in the control room 300. The temperature sensor can detect the outdoor temperature and feed back the data to the control room 300. In order to prevent losses caused by the failure of the cable 100 in the waste-derived fuel power generation system, the cable fire early warning monitoring device 200 provided by the present invention is mounted on the power cable 100 in the cable trench 400. The cable fire early warning monitoring device 200 is arranged outside the control room 300 or inside the control room 300, and is located between the control room 300 of the waste-derived fuel power generation system and the outlet of the cable trench 400.

[0040] like Figures 2 to 5 As shown, a cable fire early warning monitoring device 200 of a preferred embodiment of the present invention comprises an insert shell 201, an embedded shell 202, a monitoring device 204 and a control system 205. The insert shell 201 and the embedded shell 202 are both used to be connected to the cable 100, the insert shell 201 is connected to the embedded shell 202, and the insert shell 201, the embedded shell 202 and the cable 100 are jointly enclosed to form a sealed cavity 203. The monitoring device 204 is installed on the insert shell 201 and / or the embedded shell 202, and is used to monitor the temperature of the sealed cavity 203. Figure 4 As shown, the monitoring device 204 includes a monitoring housing 2041, a shape memory alloy 2042, and a first sensor 2043 connected to the shape memory alloy 2042. The shape memory alloy 2042 and the first sensor 2043 are both located in the monitoring housing 2041. The shape memory alloy 2042 is adhered to the inner wall of the monitoring housing 2041, and the first sensor 2043 is adhered to the cable 100, or the shape memory alloy 2042 is adhered to the cable 100, and the first sensor 2043 is adhered to the inner wall of the monitoring housing 2041. The first sensor 2043 is connected to the control system 205 for sensing the stress change of the shape memory alloy 2042 and transmitting the data to the control system 205.

[0041] In this embodiment, common shape memory alloys 2042 include alloys containing nickel and titanium, alloys containing copper, zinc and aluminum, and / or alloys containing copper, aluminum and nickel. The shape memory alloy 2042 is adhered to the top side of the inner wall of the monitoring shell 2041. The first sensor 2043 is arranged opposite to the shape memory alloy 2042 and connected to the outer surface of the cable 100. In other words, the first sensor 2043 is arranged between the shape memory alloy 2042 and the cable 100. The first sensor 2043 is a pressure sensor. For ease of control, the control system 205 can be electrically connected to the control room 300 in the waste-derived fuel power generation system.

[0042] As is well known, the shape memory alloy 2042 has the characteristic of volume contraction when heated. Based on the above technical solution, when the cable 100 catches fire, the temperature in the sealed cavity 203 rises, and the shape memory alloy 2042 in the monitoring device 204 inserted into the shell 201 and / or embedded in the shell 202 shrinks when heated. The shape memory alloy 2042 decreases in volume under the premise of constant weight, which will cause the pressure acting on the first sensor 2043 to increase. The first sensor 2043 transmits the pressure signal change information to the control system 205. The control system 205 determines that a fire occurs in the waste-derived fuel power generation system. Since the control system 205 is electrically connected to the control room 300, the control system 205 can feed back an early warning signal to the control room 300. Thus, the monitoring and early warning functions are realized. The cable fire early warning monitoring device 200 uses the unique property of heat contraction of the shape memory alloy 2042 to warn the temperature of the cable 100, and can send an early warning signal for the fault and fire of the power cable 100 in the waste-derived fuel power generation system, thereby improving the monitoring capability of the cable 100 fault.

[0043] Preferably, if Figure 4As shown, the monitoring device 204 also includes an expansion body 2044 and a second sensor 2045 connected to the expansion body 2044. The thermal expansion coefficient of the expansion body 2044 in this embodiment is positive. The expansion body 2044 can be an elastic rubber member, which expands when heated. The second sensor 2045 is a pressure sensor. The expansion body 2044 and the second sensor 2045 are both located in the monitoring shell 2041. The expansion body 2044 is adhered to the inner wall of the monitoring shell 2041, and the second sensor 2045 is adhered to the cable 100. Or, the expansion body 2044 is adhered to the cable 100, and the second sensor 2045 is adhered to the inner wall of the monitoring shell 2041. The expansion body 2044 in this embodiment is connected to the outer surface of the cable 100 and is located on one side of the first sensor 2043. The second sensor 2045 is arranged opposite to the expansion body 2044 and is connected to the top side of the inner wall of the monitoring shell 2041. The second sensor 2045 is connected to the control system 205 for sensing the stress change of the expansion body 2044 and transmitting the data to the control system 205. Under the premise that the weight of the expansion body 2044 remains unchanged, the expansion body 2044 is heated and the volume increases, resulting in a decrease in the pressure value acting on the second sensor 2045. After the second sensor 2045 senses the strain force, it feeds back the data to the control system 205, so as to achieve the purpose of sending an early warning signal to the control system 205. In the case of failure or ineffectiveness of the shape memory alloy 2042, the cable fire early warning monitoring device 200 can use the characteristic of the expansion body 2044 expanding due to heat to send an early warning signal of the failure and fire of the power cable 100 in the waste-derived fuel power generation system.

[0044] More preferably, if Figure 3 As shown, a monitoring device 204 is provided in both the insertion housing 201 and the embedded housing 202. The two monitoring devices 204 have the same structure, and both include a first sensor 2043, a second sensor 2045, a shape memory alloy 2042, and an expansion body 2044. A monitoring device 204 is provided on each side of the sealed cavity 203, respectively, which can improve the reliability and sensitivity of the cable fire early warning monitoring device 200.

[0045] In the description of the present invention, the monitoring device 204 inserted into the housing 201 is defined as a first monitoring device 204a, and the monitoring device 204 embedded in the housing 202 is defined as a second monitoring device 204b.

[0046] Specifically, the control system 205 includes a first controller 2051 and a second controller 2052. The first controller 2051 and the second controller 2052 can be intelligent controllers or PLC control systems. The first controller 2051 is set in the insertion shell 201 and is connected to the first monitoring device 204a by signal. The first monitoring device 204a can transmit the pressure signal change to the first controller 2051. The second controller 2052 is set in the embedded shell 202 and is connected to the second monitoring device 204b by signal. The second monitoring device 204b can transmit the pressure signal change to the second controller 2052. Figure 6 As shown, the first controller 2051 is electrically connected to the second controller 2052. The first controller 2051 and the second controller 2052 are backups for each other, and the second controller 2052 is a backup of the first controller 2051. When the first controller 2051 fails or fails, the second controller 2052 is signal-connected to the first monitoring device 204a and the second monitoring device 204b respectively. The first monitoring device 204a and the second monitoring device 204b transmit the detected pressure changes to the second controller 2052. Similarly, when the second controller 2052 fails or fails, the first controller 2051 is signal-connected to the first monitoring device 204a and the second monitoring device 204b respectively. Correspondingly, the first monitoring device 204a and the second monitoring device 204b are electrically connected. The second monitoring device 204b serves as a backup of the first monitoring device 204a.

[0047] like Figure 3 As shown, the width of the first monitoring device 204a in the axial direction is defined as a, and the width of the second monitoring device 204b in the axial direction is defined as b, then a=2b, which can save the material of the second monitoring device 204b and improve the economic performance. Similarly, the width of the first controller 2051 in the axial direction is defined as c, and the width of the second controller 2052 in the axial direction is defined as d, then c=2d, which can save the material of the second controller 2052 and improve the economic performance.

[0048] In addition, the cable fire early warning monitoring device 200 also includes a first water pipe 207, the water inlet of the first water pipe 207 is connected to an external water source, and the water outlet of the first water pipe 207 is arranged in the sealed cavity 203. A first valve body 220 is installed on the first water pipe 207, and the first valve body 220 is electrically connected to the control system 205. In this embodiment, there are two first water pipes 207, one of which is arranged on a side close to the insertion shell 201, and its shape is annular, surrounding the insertion shell 201, and has an independent cooling water inlet and outlet. The first valve body 220 on the first water pipe 207 is electrically connected to the first controller 2051. Another first water pipe 207 is arranged on a side close to the embedded shell 202, and its shape is annular, surrounding and embedded in the shell 202, and has an independent cooling water inlet and outlet. The first valve body 220 on the first water pipe 207 is electrically connected to the second controller 2052. In a normal state, the first valve body 220 is in a closed state. When the cable 100 fails, the temperature sensor in the control room 300 senses the temperature change and transmits the signal to the controller, which controls the first valve bodies 220 on the two first water pipes 207 to open, and the first water pipes 207 spray water into the sealed cavity 203 to achieve the cooling effect on the sealed cavity 203. When the temperature in the sealed cavity 203 rises rapidly, the first sensor 2043 and the second sensor 2045 feed back the signal to the first controller 2051 and the second controller 2052, and the first controller 2051 and the second controller 2052 determine that the temperature of the cable 100 rises, and the first controller 2051 and the second controller 2052 control the first valve body 220 to close, and adopt other methods to cool the sealed cavity 203.

[0049] Further, a second water pipe 208 is provided in the sealed cavity 203. The second valve body 221 is electrically connected to the control system 205. The water inlet of the second water pipe 208 is connected to an external water source, and the water outlet of the second water pipe 208 is provided in the sealed cavity 203. A second valve body 221 is installed on the second water pipe 208, and the second valve body 221 is electrically connected to the control system 205. There are two second water pipes 208, one of which is provided on a side close to the insertion shell 201, and its shape is annular, surrounding the insertion shell 201, and having an independent cooling water inlet and outlet. The second valve body 221 on the second water pipe 208 is electrically connected to the first controller 2051. Another second water pipe 208 is provided on a side close to the embedded shell 202, and its shape is annular, surrounding the embedded shell 202, and having an independent cooling water inlet and outlet. The second valve body 221 on the second water pipe 208 is electrically connected to the second controller 2052. In a normal state, the second valve body 221 is in a closed state. When the cable 100 malfunctions and catches fire, the first sensor 2043 and the second sensor 2045 feed back signals to the first controller 2051 and the second controller 2052. When the first controller 2051 and the second controller 2052 determine that the temperature of the cable 100 rises to the set value, the first controller 2051 and the second controller 2052 control the second valve bodies 221 on the two second water pipes 208 to open, and the second water pipes 208 spray water into the sealed cavity 203, thereby further cooling the sealed cavity 203.

[0050] Alternatively, if Figure 3 As shown, a first fireproof blocking material layer 209 is provided on the side of the monitoring device 204 away from the sealed cavity 203, and a second fireproof blocking material layer 210 is provided on the side of the monitoring device 204 close to the sealed cavity 203. The first fireproof blocking material layer 209 and the second fireproof blocking material layer 210 in this embodiment are both made of fireproof blocking material. The first fireproof blocking material and the second fireproof blocking material can protect the monitoring device 204 from being burned. Since the cable fire warning monitoring device 200 is provided with two first water pipes 207 and two second water pipes 208, in order to prevent the cooling water in the sealed cavity 203 from infiltrating into the monitoring device 204 and damaging the first sensor 2043 and the second sensor 2045, a waterproof layer 211 is provided on the side of the second fireproof blocking material layer 210 close to the sealed cavity 203. The waterproof layer 211 is specifically a waterproof board. The waterproof layer 211 inserted into the shell 201 and the waterproof layer 211 embedded in the shell 202 are two sides of the sealed cavity 203.

[0051] After the cable fire early warning monitoring device 200 detects an abnormality such as a fire in the cable 100, the cable 100 surrounded by the cable 100 is cooled by cooling water. To prevent the water in the sealed cavity 203 from flowing out, this involves the sealing problem of the sealed cavity 203.

[0052] To solve the above sealing problem, Figure 3As shown, an insertion portion 212 is provided on the side of the insertion housing 201 opposite to the embedded housing 202, and an embedding portion 213 is provided on the side of the embedded housing 202 opposite to the insertion housing 201. The embedding portion 213 has a concave cavity 219 for the insertion portion 212 to be inserted. The insertion portion 212 and the embedding portion 213 are arranged opposite to each other and positioned and matched, and the insertion portion 212 is inserted into the concave cavity 219 of the embedding portion 213. The insertion housing 201 and the embedded housing 202 are sealed and connected through the insertion portion 212 and the embedding portion 213. The insertion housing 201 and the embedded housing 202 form a sealed cavity 203 with the outer surface of the cable 100. A sealing member 214 is provided on the inner wall of the embedding portion 213 on one side relative to the insertion portion 212. The sealing member 214 can be specifically made of rubber material. By providing the sealing member 214, the insertion portion 212 and the embedding portion 213 can be tightly connected, so that the sealed cavity 203 achieves a good sealing effect.

[0053] More preferably, if Figure 3 As shown, the cable fire early warning monitoring device 200 also includes a lip seal component 206. The lip seal component 206 is provided on the end surface where the insertion portion 212 and the embedding portion 213 are in contact, which increases the end surface sealing area of ​​the insertion portion 212 and the embedding portion 213, can make the sealing cavity 203 more reliably sealed, and can balance the instability caused by some shaking of the power cable 100 itself. Figure 5As shown, the lip seal assembly 206 includes a skeleton 2061, a sealing body 2062 and an elastic member 2063. The skeleton 2061 is fixedly connected to the top side of the inner wall of the embedded portion 213. The longitudinal section of the skeleton 2061 in this embodiment is a 7-shaped structure, and the material of the skeleton 2061 is metal. The sealing body 2062 in this embodiment is a lip seal ring. The sealing body 2062 is specifically a FB type lip seal ring. The material of the sealing body 2062 is rubber. The top side of the skeleton 2061 is fixedly connected to the top inner wall of the embedded portion 213. The sealing body 2062 is connected to the top of the insertion portion 212. The sealing body 2062 is sleeved outside the skeleton 2061, that is, the skeleton 2061 is stuck in the sealing body 2062, and the skeleton 2061 provides support for the sealing body 2062. A U-shaped groove is provided at the junction of the sealing body 2062 and the end of the skeleton 2061, so that the sealing body 2062 has a certain amount of rebound and can automatically compensate in the case of wear. At the same time, the U-shaped groove can also serve as a accommodating chamber to store foreign matter blocked between the insertion portion 212 and the embedded portion 213. The elastic member 2063 is arranged between the sealing body 2062 and the skeleton 2061. Specifically, the elastic member 2063 is a spring, the spring is located in the U-shaped groove, the upper end of the spring abuts against the bottom side of the skeleton 2061, and the lower end of the spring abuts against the sealing body 2062, further improving the reliability of the seal. In this embodiment, the cable fire early warning monitoring device 200 also includes a mounting pad 215. The longitudinal section shape of the mounting pad 215 is L-shaped. The bottom side of the mounting pad 215 is fixedly connected to the top side of the insertion portion 212. A deformable body is provided on the outward side of the sealing body 2062, and the deformable body 217 is integrally formed with the sealing body 2062. The material of the deformable body 217 is rubber, which has a certain elastic modulus. The side of the deformable body 217 away from the sealing body 2062 abuts against the inner side of the mounting pad 215. The mounting pad 215 can prevent the sealing body 2062 from sliding outward, and is used to limit the displacement of the sealing body 2062 in the horizontal direction, which is conducive to fixing the position of the sealing body 2062. A deformation groove 218 is formed between the deformable body 217 and the sealing body 2062, and the deformation groove 218 opens toward the outside of the concave cavity 219, which can accommodate foreign matter blocked between the insertion part 212 and the embedded part 213. The bottom inner wall of the embedded part 213 is provided with a protruding part 216 protruding downward, and the protruding part 216 is arranged on the inner side of the skeleton 2061. The outer side of the protruding part 216 abuts against the inner side of the skeleton 2061 to prevent the skeleton 2061 from sliding toward the inner side of the concave cavity 219.

[0054] The working principle of the present invention is as follows: the waterproof layer 211 on the insertion shell 201, the insertion part 212, and the waterproof layer 211 and the embedded part 213 on the embedded shell 202 form a sealed cavity 203 with the power cable 100. The insertion shell 201 is provided with a first fireproof blocking material layer 209, a first monitoring device 204a, a second fireproof blocking material layer 210, a waterproof layer 211, a first water pipe 207 and a second water pipe 208 in sequence from the end away from the sealed cavity 203 to the control room 300 side. The embedded shell 202 is provided with a first fireproof blocking material layer 209, a second monitoring device 204b, a second fireproof blocking material layer 210, a waterproof layer 211, a first water pipe 207 and a second water pipe 208 in sequence from the end away from the sealed cavity 203 to the end close to the control room 300. A sealing member 214 and a lip seal assembly 206 are provided between the insertion part 212 and the embedded part 213. The monitoring device 204 is provided in both the insertion portion 212 and the embedding portion 213. The monitoring device 204 is provided with a shape memory alloy 2042, a first sensor 2043, an expansion body 2044 and a second sensor 2045. The first sensor 2043 is provided between the shape memory alloy 2042 and the cable 100, and the second sensor 2045 is provided between the expansion body 2044 and the inner wall of the monitoring housing 2041.

[0055] The working process of the present invention is:

[0056] Research shows that when shape memory alloy 2042 is cooled to a temperature below temperature T1, the shape memory wire mainly comes from austenite, and the martensite component of the shape memory wire increases; when heated to a temperature above T4, the shape memory wire mainly comes from martensite, and the austenite component does not increase further; when cooled to a temperature below or equal to T2, the shape memory wire mainly comes from austenite, and the martensite component of the shape memory wire basically reaches the maximum, where: T2 <T1<T3<T4。

[0057] When the first controller 2051 or the second controller 2052 determines that the temperature of the shape memory alloy 2042 exceeds X, where T2+0.5×(T1-T2)≤X≤T2+0.6×(T1-T2), the control system 205 controls the first valve body 220 to open, the first water pipe 207 to cool the sealed cavity 203, and the control system 205 sends a warning signal to the waste-derived fuel power generation system control room 300.

[0058] When the first controller 2051 or the second controller 2052 determines that the temperature of the shape memory alloy 2042 ring exceeds Y, where Y=T2+0.9×(T1-T2), the control system 205 closes the first valve body 220, opens the second valve body 221, uses the second water pipe 208 to cool the sealed cavity 203, and sends a warning signal to the waste-derived fuel power generation system control room 300, and sends a trip enable signal to the circuit protection device where the power cable 100 is located.

[0059] The specific operations are as follows:

[0060] During normal operation, when the control room 300 of the waste-derived fuel power generation system detects that the outdoor temperature exceeds 30° C., the control system 205 controls any one of the first valve bodies 220 to open, and uses one of the first water pipes 207 to spray cool the sealed cavity 203 .

[0061] When the control room 300 of the waste-derived fuel power generation system detects that the outdoor temperature exceeds 35° C., the control system 205 controls the two first valve bodies 220 to open simultaneously, and uses the two first water pipes 207 to spray and cool the sealed cavity 203 at the same time.

[0062] When the pressure value of any one of the two first sensors 2043 and the two second sensors 2045 exceeds the threshold value, the sensor transmits a signal to the first controller 2051 or the second controller 2052. The control system 205 closes the first valve body 220, the first water pipe 207 stops discharging water, and opens the second valve body 221 at the same time, and uses the second water pipe 208 to cool the sealed chamber 203. The control system 205 sends an early warning signal to the control room 300 of the waste-derived fuel power generation system.

[0063] When any two pressure values ​​of the two first sensors 2043 and the two second sensors 2045 exceed the threshold, the sensors transmit signals to the first controller 2051 and / or the second controller 2052. The control system 205 closes the first valve body 220, the first water pipe 207 stops discharging water, and at the same time opens the second valve body 221, and uses the second water pipe 208 to cool the sealed cavity 203. The control system 205 sends an early warning signal to the control room 300 of the waste-derived fuel power generation system. After a preset delay time, the control room 300 sends a trip enable signal to the circuit protection device where the power cable 100 is located.

[0064] The first controller 2051 and the second controller 2052 serve as backup for each other. When any one of the first controller 2051 and the second controller 2052 fails or malfunctions, the other controller can independently control the first valve body 220 and the second valve body 221, and send a local intelligent controller failure alarm to the controller in the control room 300 of the waste-derived fuel power generation system. The second controller 2052 can serve as a backup for the first controller 2051. The width of the second controller 2052 along the axial direction of the power cable 100 is half of the first controller 2051, so as to save materials and improve economic performance.

[0065] The second monitoring device 204b can be used as a backup for the first monitoring device 204a. The width of the second monitoring device 204b along the axial direction of the power cable 100 is half of that of the first monitoring device 204a, so as to save materials and improve economic performance.

[0066] In summary, an embodiment of the present invention provides a cable fire warning monitoring device, which is inserted into a shell, embedded in a shell and surrounded by a cable to form a sealed cavity. When a fire or failure occurs in the cable, the temperature in the sealed cavity rises, causing the shape memory alloy in the monitoring device arranged in the inserted shell and / or embedded in the shell to shrink due to heat, and the pressure acting on the first sensor increases. The first sensor transmits the pressure change signal to the control system, and the control system then issues a warning signal. The cable fire warning monitoring device utilizes the property of shape memory metal shrinking due to heat, and connects a first sensor for detecting pressure changes to the shape memory metal. It can provide timely feedback and warning on the temperature of the sealed cavity, improve the cable fault monitoring capability, and help the staff to understand the cable condition in a timely manner.

[0067] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A cable fire early warning monitoring device, characterized in that: It includes an insert housing, an embedding housing, a monitoring device, and a control system; The insertion shell and the embedded shell are both used to be connected to the cable, the insertion shell is connected to the embedded shell, and the insertion shell, the embedded shell and the cable are jointly enclosed to form a sealed cavity; The monitoring device is installed on the insertion shell and / or the embedded shell, and is used to monitor the temperature of the sealed cavity. The monitoring device includes a monitoring shell, a shape memory alloy, and a first sensor connected to the shape memory alloy. The shape memory alloy and the first sensor are both located in the monitoring shell, and the first sensor is arranged opposite to the shape memory alloy. The shape memory alloy is adhered to the inner wall of the monitoring housing, and the first sensor is adhered to the cable. Or, the shape memory alloy is adhered to the cable, and the first sensor is adhered to the inner wall of the monitoring housing, The first sensor is connected to the control system signal, and is used to sense the stress change of the shape memory alloy and transmit data to the control system.

2. The cable fire early warning monitoring device according to claim 1, characterized in that: The monitoring device further comprises an expansion body and a second sensor connected to the expansion body, wherein the expansion body and the second sensor are both located in the monitoring housing; The expansion body is adhered to the inner wall of the monitoring housing, and the second sensor is adhered to the cable. Or, the expansion body is adhered to the cable, and the second sensor is adhered to the inner wall of the monitoring housing, The second sensor is connected to the control system signal, and is used to sense the stress change of the expansion body and transmit data to the control system.

3. The cable fire early warning monitoring device according to claim 1, characterized in that: The monitoring device is arranged in both the insertion shell and the embedding shell.

4. The cable fire early warning monitoring device according to claim 3, characterized in that: The monitoring device inserted into the shell is defined as a first monitoring device, and the monitoring device embedded in the shell is defined as a second monitoring device; The control system includes a first controller and a second controller electrically connected to the first controller; The first controller is disposed in the insertion housing and is signal-connected to the first monitoring device; The second controller is disposed in the embedded housing and is signal-connected to the second monitoring device.

5. The cable fire early warning monitoring device according to claim 4, characterized in that: The width of the first monitoring device in the axial direction thereof is defined as a, and the width of the second monitoring device in the axial direction thereof is defined as b, then a=2b; Define the width of the first controller in the axial direction as c, and define the width of the second controller in the axial direction as d, then c=2d.

6. The cable fire early warning monitoring device according to claim 1, characterized in that: It also includes a first water pipe, the water outlet of the first water pipe is arranged in the sealed cavity, a first valve body is installed on the first water pipe, and the first valve body is electrically connected to the control system.

7. The cable fire early warning monitoring device according to claim 1, characterized in that: A second water pipe is provided in the sealed cavity, a second valve body is installed on the second water pipe, and the second valve body is electrically connected to the control system.

8. The cable fire early warning monitoring device according to any one of claims 1 to 7, characterized in that: A first fireproof blocking material layer is provided on the side of the monitoring device away from the sealed cavity, a second fireproof blocking material layer is provided on the side of the monitoring device close to the sealed cavity, and a waterproof layer is provided on the side of the second fireproof blocking material layer close to the sealed cavity.

9. The cable fire early warning monitoring device according to any one of claims 1 to 7, characterized in that: An insertion portion is provided on the side of the insertion shell opposite to the embedded shell, and an embedding portion is provided on the side of the embedded shell opposite to the insertion shell. The insertion portion and the embedding portion are arranged opposite to each other and positioned together. The insertion portion is inserted into the embedding portion to form the sealed cavity. A sealing member is provided on the inner wall of the embedding portion on one side relative to the insertion portion.

10. The cable fire early warning monitoring device according to claim 9, characterized in that: It also includes a lip-shaped sealing assembly, which includes a frame, a sealing body and an elastic member, the frame is fixedly connected to the top side of the inner wall of the embedded part, the sealing body is connected to the top of the insertion part, the sealing body is sleeved outside the frame, and the elastic member is arranged between the sealing body and the frame.

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