阅读说明：本技术 感温报警装置及电缆接头 (Temperature sensing alarm device and cable joint ) 是由 卢沛忠 王志伟 吴旭辉 叶沃力 于 2021-01-18 设计创作，主要内容包括：本发明公开了一种感温报警装置及电缆接头。该装置包括：热敏电阻和报警模块；报警模块包括报警单元和复位单元；热敏电阻套设在被测件上,其中被测件的温度等于预设温度,热敏电阻的阻值小于或等于预设阻值；热敏电阻的第一端用于接入第一电源,热敏电阻的第二端与报警单元的第一端电连接,报警单元的第二端用于输入第二电源,报警单元用于所述被测件的温度等于预设温度时,发出报警信号；复位单元的第一端用于接入第一电源,复位单元的第二端与报警单元的第二端电连接,复位单元用于当报警单元发出报警信号控制所述报警单元处于断路状态。本发明达到了及时发现电缆发热问题、及时维修的效果。(The invention discloses a temperature sensing alarm device and a cable joint. The device includes: the thermistor and the alarm module; the alarm module comprises an alarm unit and a reset unit; the thermistor is sleeved on the tested piece, wherein the temperature of the tested piece is equal to a preset temperature, and the resistance value of the thermistor is smaller than or equal to a preset resistance value; the first end of the thermistor is used for being connected with a first power supply, the second end of the thermistor is electrically connected with the first end of the alarm unit, the second end of the alarm unit is used for inputting a second power supply, and the alarm unit is used for sending an alarm signal when the temperature of the detected piece is equal to the preset temperature; the first end of the reset unit is used for being connected with a first power supply, the second end of the reset unit is electrically connected with the second end of the alarm unit, and the reset unit is used for controlling the alarm unit to be in a circuit breaking state when the alarm unit sends out an alarm signal. The invention achieves the effects of finding the heating problem of the cable in time and maintaining the cable in time.)

1. A temperature-sensitive alarm device, comprising: the thermistor and the alarm module; the alarm module comprises an alarm unit and a reset unit;

the thermistor is sleeved on a tested piece, wherein the temperature of the tested piece is equal to a preset temperature, and the resistance value of the thermistor is smaller than or equal to a preset resistance value;

the first end of the thermistor is used for being connected with a first power supply, the second end of the thermistor is electrically connected with the first end of the alarm unit, the second end of the alarm unit is used for inputting a second power supply, and the alarm unit is used for sending an alarm signal when the temperature of the tested piece is equal to the preset temperature;

the first end of the reset unit is used for being connected with a first power supply, the second end of the reset unit is electrically connected with the second end of the alarm unit, and the reset unit is used for controlling the alarm unit to be in a circuit breaking state when the alarm unit sends out an alarm signal.

2. The temperature-sensitive alarm device according to claim 1, wherein the thermistor is a negative temperature coefficient thermistor.

3. The temperature-sensitive alarm device according to claim 1, wherein the alarm module further comprises: first relay and second relay, first relay includes the normally closed contact, the second relay includes first coil, thermistor's first end with first power electricity is connected, thermistor's second end with the first end electricity of first relay's normally closed contact is connected, the second end of first relay's normally closed contact with the alarm unit electricity is connected, alarm unit's second end with the second power electricity is connected, just thermistor's first end with the first end electricity of second relay's first coil is connected, the second end of second relay's first coil with the second power electricity is connected.

4. The temperature-sensing alarm device according to claim 3, wherein the reset unit further comprises a first switch, the first relay further comprises a second coil and a first normally open contact, the second relay further comprises a second normally open contact, a first end of the first switch is electrically connected to the first power supply, a second end of the first switch is electrically connected to a first end of the second coil of the first relay, a second end of the second coil is electrically connected to a first end of the second normally open contact, and a second end of the second normally open contact is electrically connected to the second power supply;

the first end of the first switch is electrically connected with the first normally open contact, and the second end of the first switch is electrically connected with the second end of the first normally open contact.

The first switch, the second coil and the first normally open contact of the first relay, and the second normally open contact of the second relay constitute the reset unit.

5. The temperature sensing alarm device according to claim 1, wherein the alarm module is disposed on a first flexible circuit board, and the first flexible circuit board is disposed on the thermistor.

6. The temperature-sensing alarm device according to claim 1, further comprising an information collecting and transmitting module; the information acquisition and transmission module is arranged on the second flexible circuit board;

the information acquisition and transmission module comprises an information acquisition unit and a wireless transmission unit;

the input end of the information acquisition unit is electrically connected with the tested piece, the output end of the information acquisition unit is electrically connected with the input end of the wireless transmission unit, and the information acquisition unit is used for acquiring current information of the tested piece and transmitting the current information to the wireless transmission unit;

the output end of the wireless transmission unit is used for sending current information to the terminal.

7. The temperature-sensing alarm device according to claim 6, wherein the information acquisition unit includes a current transformer and an ammeter;

the input end of the current transformer is electrically connected with the tested piece, the output end of the current transformer is electrically connected with the input end of the ammeter, and the output end of the ammeter is electrically connected with the input end of the wireless transmission unit.

8. The temperature-sensing alarm device according to claim 6, wherein the second flexible printed circuit board is fitted over the thermistor.

9. The temperature-sensitive alarm device according to claim 1, wherein the thermistor is an open ring or a closed ring.

10. A cable joint, characterized by comprising the temperature-sensitive alarm device according to any one of claims 1 to 9, and further comprising:

the device comprises a first tested piece, a second tested piece and a wire lug;

the temperature sensing alarm device is sleeved at the first end of the wire lug;

the first tested piece is electrically connected with the first end of the wire lug, and the second tested piece is electrically connected with the second end of the wire lug.

Technical Field

The embodiment of the invention relates to a high-temperature alarm technology, in particular to a temperature-sensing alarm device and a cable joint.

Background

With the continuous development of economic society, people are increasingly demanding on electricity, and when the cable can not meet the demand for electricity, the cable can generate heat due to overload of the line to burn out equipment, so that the temperature of the cable needs to be monitored.

The existing method for monitoring the temperature of the cable is mainly that a worker monitors the temperature through a thermal imager or a temperature sensor.

However, the temperature of the cable is monitored by the manual thermal imager, the real-time monitoring is difficult, the cable is not easy to find when the cable just generates heat, particularly, the interface of the cable is difficult to find when the interface generates heat, and the timely maintenance cannot be realized.

Disclosure of Invention

The invention provides a temperature sensing alarm device and a cable joint, which are used for monitoring the temperature of the cable joint in real time and finding the problem of heating of a cable in time.

In a first aspect, an embodiment of the present invention provides a temperature sensing alarm device, including: the thermistor and the alarm module; the alarm module comprises an alarm unit and a reset unit;

the thermistor is sleeved on a tested piece, wherein the temperature of the tested piece is equal to a preset temperature, and the resistance value of the thermistor is smaller than or equal to a preset resistance value;

the first end of the thermistor is used for being connected with a first power supply, the second end of the thermistor is electrically connected with the first end of the alarm unit, the second end of the alarm unit is used for inputting a second power supply, and the alarm unit is used for sending an alarm signal when the temperature of the tested piece is equal to the preset temperature;

the first end of the reset unit is used for being connected with a first power supply, the second end of the reset unit is electrically connected with the second end of the alarm unit, and the reset unit is used for controlling the alarm unit to be in a circuit breaking state when the alarm unit sends out an alarm signal.

Optionally, the thermistor is a negative temperature coefficient thermistor.

Optionally, the alarm module further comprises: first relay and second relay, first relay includes the normally closed contact, the second relay includes first coil, thermistor's first end with first power electricity is connected, thermistor's second end with the first end electricity of first relay's normally closed contact is connected, the second end of first relay's normally closed contact with the alarm unit electricity is connected, alarm unit's second end with the second power electricity is connected, just thermistor's first end with the first end electricity of second relay's first coil is connected, the second end of second relay's first coil with the second power electricity is connected.

Optionally, the reset unit further includes a first switch, the first relay further includes a second coil and a first normally open contact, the second relay further includes a second normally open contact, a first end of the first switch is electrically connected to the first power supply, a second end of the first switch is electrically connected to a first end of a second coil of the first relay, a second end of the second coil is electrically connected to a first end of the second normally open contact, and a second end of the second normally open contact is electrically connected to the second power supply;

the first end of the first switch is electrically connected with the first normally open contact, and the second end of the first switch is electrically connected with the second end of the first normally open contact.

The first switch, the second coil and the first normally open contact of the first relay, and the second normally open contact of the second relay constitute the reset unit.

Optionally, the alarm module is arranged on a first flexible circuit board, and the thermistor is sleeved with the first flexible circuit board.

Optionally, the temperature sensing alarm device further comprises an information acquisition and transmission module; the information acquisition and transmission module is arranged on the second flexible circuit board;

the information acquisition and transmission module comprises an information acquisition unit and a wireless transmission unit;

the input end of the information acquisition unit is electrically connected with the tested piece, the output end of the information acquisition unit is electrically connected with the input end of the wireless transmission unit, and the information acquisition unit is used for acquiring current information of the tested piece and transmitting the current information to the wireless transmission unit;

the output end of the wireless transmission unit is used for sending current information to the terminal.

Optionally, the information acquisition unit includes a current transformer and an ammeter;

the input end of the current transformer is electrically connected with the tested piece, the output end of the current transformer is electrically connected with the input end of the ammeter, and the output end of the ammeter is electrically connected with the input end of the wireless transmission unit.

Optionally, the second flexible circuit board is sleeved on the thermistor.

Optionally, the thermistor is an open ring or a closed ring.

In a second aspect, an embodiment of the present invention further provides a cable connector, where the cable connector includes the temperature-sensitive alarm device in the first aspect, and further includes:

the device comprises a first tested piece, a second tested piece and a wire lug;

the temperature sensing alarm device is sleeved at the first end of the wire lug;

the first tested piece is electrically connected with the first end of the wire lug, and the second tested piece is electrically connected with the second end of the wire lug.

According to the invention, the thermistor is sleeved on the tested piece, the resistance value of the thermistor changes along with the change of the temperature of the tested piece, the resistance value of the thermistor decreases along with the rise of the temperature of the tested piece, when the temperature of the tested piece rises to the preset temperature, the resistance value of the thermistor is less than or equal to the preset resistance value, the first power supply can supply power to the alarm unit through the thermistor, and the alarm unit can send out an alarm signal. Therefore, the temperature of the cable joint is monitored in real time, the alarm is given when the temperature of the measured piece reaches the preset temperature, and the staff is reminded to check and maintain. The invention solves the problems that the heating of the cable and the cable joint is more difficult to find and the timely maintenance cannot be realized, and achieves the effects of timely finding the heating problem of the cable and timely maintaining.

Drawings

Fig. 1 is a schematic structural diagram of a temperature-sensing alarm device according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a temperature-sensing alarm device according to a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first flexible circuit board according to a second embodiment of the present invention;

fig. 4 is a schematic structural diagram of an information acquisition and transmission module according to a second embodiment of the present invention;

fig. 5 is a schematic structural diagram of a second flexible circuit board according to a second embodiment of the present invention;

fig. 6 is a structural sectional view of a cable connector according to a third embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Example one

Fig. 1 is a schematic structural diagram of a temperature sensing alarm device according to a first embodiment of the present invention, which is applicable to a temperature sensing alarm situation, and referring to fig. 1, the temperature sensing alarm device includes: a thermistor 110 and an alarm module 120; the alarm module 120 includes an alarm unit 121 and a reset unit 122; the thermistor 110 is sleeved on a tested piece, wherein the temperature of the tested piece is equal to a preset temperature, and the resistance value of the thermistor 110 is smaller than or equal to a preset resistance value; the first end of the thermistor 110 is used for being connected with a first power supply 310, the second end of the thermistor 110 is electrically connected with the first end of the alarm unit 121, the second end of the alarm unit 121 is used for inputting a second power supply 320, and the alarm unit 121 is used for sending an alarm signal when the temperature of a detected piece is equal to a preset temperature; the first end of the reset unit 122 is used for connecting to the first power supply 310, the second end of the reset unit 122 is electrically connected to the second end of the alarm unit 121, and the reset unit 122 is used for controlling the alarm unit 121 to be in an off state when the alarm unit 121 sends an alarm signal.

The first power supply 310 may be a positive voltage power supply, for example, and the second power supply 320 may be a negative voltage power supply, for example.

Specifically, the tested piece may include, for example, a cable and a cable connector, the thermistor 110 is sleeved on the tested piece and contacts with the tested piece, and the temperature of the thermistor 110 is consistent with that of the tested piece. When the temperature of the detected piece is lower than the preset temperature, the temperature of the thermistor 110 is also lower than the preset temperature, and the resistance value of the thermistor 110 is very large, so that the first power supply 310 cannot supply power to the alarm unit 121 through the thermistor 110, and the alarm unit 121 does not give an alarm. When the temperature of the detected part is increased to the preset temperature, the resistance value of the thermistor 110 is less than or equal to the preset resistance value, the current can pass through the thermistor, that is, the first power supply 310 can supply power to the alarm unit 121 through the thermistor 110, and the alarm unit 121 can send out an alarm signal. Therefore, the effect of alarming when the temperature of the measured piece reaches the preset temperature and reminding workers to check and maintain is achieved. The reset unit 122 is configured to, when the alarm unit 121 sends an alarm signal to control the alarm unit 121 to be in a circuit-breaking state, enable the alarm unit 122 to be in a circuit-breaking state, and enable the alarm unit 122 to stop giving an alarm. In conclusion, the technical scheme realizes real-time monitoring of the temperature of the measured piece, and the measured piece can give an alarm in time when the temperature is too high to reach the preset temperature, so that the heating problem of the cable and the cable joint can be found in time, timely maintenance is realized, and equipment is prevented from being burnt out.

Fig. 6 is a cross-sectional view of a cable connector according to a third embodiment of the present invention, and referring to fig. 6, a thermistor 110 is sleeved on a tested piece.

According to the technical scheme of the embodiment, the thermistor 110 is sleeved on the tested piece, the resistance value of the thermistor 110 changes along with the change of the temperature of the tested piece, when the temperature of the tested piece rises to the preset temperature, the resistance value of the thermistor 110 is smaller than or equal to the preset resistance value, the first power supply 310 can supply power to the alarm unit 121 through the thermistor 110, and the alarm unit 121 can send out an alarm signal. Therefore, the temperature of the cable joint is monitored in real time, the alarm is given when the temperature of the measured piece reaches the preset temperature, and the staff is reminded to check and maintain. The technical scheme of this embodiment has solved more difficult discovery when cable and cable joint generate heat, can't realize the problem of in time maintenance, has reached the effect of in time discovering the cable problem of generating heat, in time maintenance. In addition, the reset unit 122 can be used for controlling the alarm unit 121 to be in a disconnection state when the alarm unit 121 sends an alarm signal, so that the alarm unit 122 stops alarming.

Example two

Fig. 2 is a schematic structural diagram of a temperature sensing alarm device according to a second embodiment of the present invention, which is applicable to a temperature sensing alarm situation, and optionally, referring to fig. 2, the thermistor 110 is a negative temperature coefficient thermistor.

Specifically, the resistance value of the thermistor 110 decreases with the increase of the temperature, when the temperature of the detected piece is lower than the preset temperature, the temperature of the thermistor 110 is also lower than the preset temperature, and the resistance value of the thermistor 110 is large, so that the first power supply 310 cannot supply power to the alarm unit 121 through the thermistor 110, and the alarm unit 121 does not give an alarm. The temperature of the thermistor 110 increases with the increase of the temperature of the tested object, the resistance value of the thermistor 110 decreases, when the temperature of the tested object increases to the preset temperature, the resistance value of the thermistor 110 is less than or equal to the preset resistance value, the current can pass through the thermistor, that is, the first power supply 310 can supply power to the alarm unit 121 through the thermistor 110, and the alarm unit 121 can send an alarm signal. Thereby realized heating when being surveyed the piece, the temperature of being surveyed the piece rises to preset temperature promptly and reports to the police, reaches the effect that in time reminds the staff to inspect and maintain.

Optionally, referring to fig. 2, the alarm module 120 further includes: the first relay 123 comprises a normally closed contact 123a, the second relay 124 comprises a first coil 124a, a first end of the thermistor 110 is electrically connected with a first power supply 310, a second end of the thermistor 110 is electrically connected with a first end of the normally closed contact 123a of the first relay 123, a second end of the normally closed contact 123a of the first relay 124 is electrically connected with the alarm unit 121, a second end of the alarm unit 121 is electrically connected with a second power supply, a first end of the thermistor 110 is electrically connected with a first end of the first coil 124a of the second relay 124, and a second end of the first coil 124a of the second relay 123 is electrically connected with a second power supply.

Specifically, when the temperature of the detected object is lower than the preset temperature, the temperature of the thermistor 110 is also lower than the preset temperature, and the resistance value of the thermistor 110 is very large, so that the first power supply 310 cannot supply power to the alarm unit 121 through the thermistor 110, and the alarm unit 121 does not give an alarm. With the temperature rise of the thermistor 110, the temperature of the thermistor 110 rises, the resistance value of the thermistor 110 increases, when the temperature of the detected piece rises to the preset temperature, the resistance value of the thermistor 110 is smaller than or equal to the preset resistance value, the current can pass through the thermistor, that is, the first power supply 310 can supply power to the alarm unit 121 through the thermistor 110 and the normally closed contact 123a of the first relay 123, and the alarm unit 121 can send out an alarm signal. While the first coil 124a of the second relay 124 is also energized. Therefore, the alarm is given when the temperature of the measured piece reaches the preset temperature, and the staff is reminded to check and maintain. The reset unit 122 can be used for controlling the alarm unit 121 to be in a disconnection state when the alarm unit 121 sends an alarm signal, so that the alarm unit 122 stops alarming. In conclusion, the technical scheme realizes real-time monitoring of the temperature of the tested piece, can give an alarm in time when the tested piece reaches the preset temperature when heating, finds the heating problem of the tested piece in time, realizes timely maintenance and prevents equipment from being burnt out.

Optionally, referring to fig. 2, the reset unit 122 further includes a first switch 122a, the first relay 123 further includes a second coil 123b and a first normally-open contact 123c, the second relay 124 further includes a second normally-open contact 124b, a first end of the first switch 122a is electrically connected to the first power supply 310, a second end of the first switch 122a is electrically connected to a first end of the second coil 123b of the first relay 123, a second end of the second coil 123b is electrically connected to a first end of the second normally-open contact 124b, and a second end of the second normally-open contact 124b is electrically connected to the second power supply; the first end of the first switch 122a is further electrically connected to a first normally open contact 123c, and the second end of the first switch 122a is further electrically connected to a second end of the first normally open contact 123 c. The first switch 122a, the second coil 123b and the first normally open contact 123c of the first relay 123, and the second normally open contact 124b of the second relay 124 constitute the reset unit 122.

Specifically, when the temperature of the tested piece reaches the preset temperature, the resistance value of the thermistor 110 reaches the preset resistance value, the first power supply 310 may supply power to the alarm unit 121 and the first coil 124a of the second relay 124 through the thermistor 110, the alarm unit 121 may send an alarm signal, and after the first coil 124a of the second relay 124 is powered, the second normally open contact 124b of the second relay 124 is closed. After receiving the alarm signal, the maintenance personnel closes the first switch 122a, so that the first power supply 310, the first switch 122a, the second coil 123b of the first relay 123, the second normally open contact 124b of the second relay 124 and the second power supply 320 form a closed loop, the second coil 123b of the first relay 123 is powered on, the normally closed contact 123a of the first relay 123 is disconnected, the alarm unit 121 is powered off, the alarm unit 121 does not send the alarm signal any more, and the reset effect is achieved. Meanwhile, the first normally open contact 123c of the first relay 123 is closed, so that the second coil 123b of the first relay 123 can still be ensured to be powered after the first switch 122a is opened. For example, the first switch 122a may select a reset button, and when pressed, the circuit in which the first switch 122a is located is shorted, and when released, the open circuit is restored.

Fig. 3 is a schematic structural diagram of a first flexible circuit board according to a second embodiment of the present invention, and optionally, referring to fig. 3 and fig. 6, the alarm module 120 is disposed on the first flexible circuit board 1, and the first flexible circuit board 1 is sleeved on the thermistor 110.

Specifically, the flexible printed circuit board is a flexible printed circuit board, and has the characteristics of high wiring density, light weight, thin thickness and good bending property. The alarm module 120 is disposed on the first flexible circuit board 1, so that the first flexible circuit board 1 can be sleeved on the thermistor 110, thereby ensuring that the alarm module 120 can be sleeved on the thermistor 110. Therefore, the temperature sensing alarm device can be well sleeved on the measured piece to complete the monitoring of the temperature of the measured piece.

Fig. 4 is a schematic structural diagram of an information collecting and transmitting module according to a second embodiment of the present invention, fig. 5 is a schematic structural diagram of a second flexible circuit board according to a second embodiment of the present invention, and optionally, referring to fig. 4 and fig. 5, the temperature sensing alarm device further includes an information collecting and transmitting module 130; the information acquisition and transmission module 130 is arranged on the second flexible circuit board 2; the information acquisition and transmission module 130 comprises an information acquisition unit 131 and a wireless transmission unit 132; the input end of the information acquisition unit 131 is electrically connected with the tested piece, the output end of the information acquisition unit 131 is electrically connected with the input end of the wireless transmission unit 132, and the information acquisition unit 131 is used for acquiring current information of the tested piece and sending the current information to the wireless transmission unit 132; the output of the wireless transmission unit 132 is used to send current information to the terminal.

Specifically, the information acquisition unit 131 may acquire parameter information of the detected piece, for example, the parameter information may be a current value, a voltage value, or other parameter information, after the information acquisition unit 131 acquires the parameter information of the detected piece, the parameter information may be sent to the wireless transmission unit 132, the wireless transmission unit 132 may send the parameter information of the detected piece to the terminal in a wireless transmission manner, and the terminal may be, for example, a background server, a mobile phone of a maintenance worker, or another terminal, which is not limited specifically here. Therefore, the maintenance personnel can obtain the parameter information of the measured piece in real time, and when the temperature of the measured piece is too high or the current is too large, the maintenance personnel can timely or timely maintain the measured piece, so that accidents are avoided.

Alternatively, referring to fig. 4, the information collecting unit 131 includes a current transformer 131a and an ammeter 131 b; the input end of the current transformer 131a is electrically connected with the tested piece, the output end of the current transformer 131a is electrically connected with the input end of the ammeter 131b, and the output end of the ammeter 131b is electrically connected with the input end of the wireless transmission unit 132.

Specifically, the information acquisition unit 131 may include, for example, a current transformer 131a and an ammeter 131b, each current transformer 131a has a respective turn ratio, the current transformer 131a may convert a current value of the measured object according to the turn ratio and output the converted current value, so that the ammeter 131b may obtain the converted current value, the wireless transmission unit 132 obtains the converted current value measured by the ammeter 131b and transmits the converted current value to the terminal, and the terminal converts the obtained converted current value according to the turn ratio of the current transformer 131a to obtain the current value of the measured object. Therefore, the maintenance personnel can obtain the current value of the measured piece in real time, and when the current value of the measured piece is too large, the maintenance personnel can timely detect and maintain the measured piece.

Fig. 5 is a schematic structural diagram of a second flexible circuit board according to a second embodiment of the present invention, and optionally, referring to fig. 5 and fig. 6, the second flexible circuit board 2 is sleeved on the thermistor 110.

Specifically, the second flexible circuit board 2 is sleeved on the thermistor 110, so that the information collecting and transmitting module 130 can be sleeved on the thermistor 110, at this time, the first flexible circuit board 1 is sleeved on the second flexible circuit board 2, so that the temperature sensing alarm device can detect the temperature of the detected piece in real time, detect the parameter information of the detected piece, and send the parameter information to the terminal.

Alternatively, referring to fig. 2, the thermistor 110 is an open ring or a closed ring.

Specifically, the thermistor 110 may be an open-type ring, and may be sleeved on the measured object through the opening, and the size of the opening may be set according to the size of the measured object, which is not specifically limited herein. The thermistor 110 is arranged to be an open circular ring, so that the thermistor can be conveniently sleeved on a tested piece, and the operation is simple. The thermistor 110 may also be a closed ring, which is sleeved on the thermistor 110 and is not easy to fall off. The specific shape of the thermistor 110 can be set according to practical situations and is not limited herein.

According to the technical scheme of the embodiment, the thermistor 110 is sleeved on the tested piece, the resistance value of the thermistor 110 is reduced along with the rise of the temperature, when the temperature of the tested piece rises to the preset temperature, the resistance value of the thermistor 110 is smaller than or equal to the preset resistance value, the current can pass through the thermistor, namely the first power supply 310 can supply power to the alarm unit 121 through the thermistor 110 and the normally closed contact 123a of the first relay 123, and the alarm unit 121 can send out an alarm signal. Therefore, maintenance personnel can timely or information that the temperature of the measured piece is too high, and the effect of timely maintenance is achieved. After receiving the alarm signal, the maintenance personnel closes the first switch 122a, so that the first power supply 310, the first switch 122a, the second coil 123b of the first relay 123, the second normally open contact 124b of the second relay 124 and the second power supply 320 form a closed loop, the second coil 123b of the first relay 123 is powered on, the normally closed contact 123a of the first relay 123 is disconnected, the alarm unit 121 is powered off, the alarm unit 121 does not send the alarm signal any more, and the reset effect is achieved. And the alarm module 120 is disposed on the first flexible circuit board 1, and the first flexible circuit board 1 may be sleeved on the thermistor 110. An information acquisition and transmission module 130 can be further arranged between the thermistor 110 and the first flexible circuit board 1, the information acquisition and transmission module 130 is arranged on the second flexible circuit board 2, and the second flexible circuit board 2 is sleeved on the thermistor 110. Information acquisition and transmission module 130's information acquisition unit 131 can gather the parameter information of being surveyed the piece to send wireless transmission unit 132, wireless transmission unit 132 can be through wireless transmission's mode with the parameter information of being surveyed the piece send the terminal, thereby make the maintenance personal can obtain the parameter information of being surveyed the piece in real time, when being surveyed a high temperature or when the electric current is too big, the maintenance personal can be timely perhaps, thereby in time maintain, avoid appearing the accident. The technical scheme of this embodiment has solved more difficult discovery when cable and cable joint generate heat, can't realize the problem of in time maintenance, has reached the effect of in time discovering the cable problem of generating heat, in time maintenance.

EXAMPLE III

Fig. 6 is a structural cross-sectional view of a cable connector according to a third embodiment of the present invention, referring to fig. 6, the cable connector includes the temperature-sensitive alarm device 10 according to any of the embodiments, and further includes: a first tested piece 210, a second tested piece 220 and a wire lug 230; the temperature sensing alarm device 10 is sleeved on the first end of the wire lug 230; the first device under test 210 is electrically connected to a first end of the lug 230, and the second device under test 220 is electrically connected to a second end of the lug 230.

Specifically, the first tested object 210 may be, for example, a cable, the cable is electrically connected to a first end of the lug 230 at a joint, a slot is disposed at the first end of the lug 230, and the first tested object 210 is disposed in the slot and is thus electrically connected to the first end of the lug 230. The second device under test 220 may be, for example, a cable, and the second device under test 220 is electrically connected to the second end of the lug 230, so that the lug 230 connects the first device under test 210 and the second device under test 220. The temperature sensing alarm device 10 is sleeved on the first end of the wire lug 230, so that the temperature of the first tested piece 210 can be detected in real time, and the detection of the temperature of the cable and the cable joint is realized.

The cable joint provided by the present embodiment includes the temperature sensing alarm device 10 of the above embodiment, and the implementation principle and technical effect of the cable joint provided by the present embodiment are similar to those of the above embodiment, and are not described herein again.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.