Temperature monitoring device and method

Abstract

The present invention discloses a temperature monitoring device and method. The present invention relates to the field of temperature monitoring technology. The temperature monitoring device includes a sensing module, a detection probe and a background terminal device; the sensing module includes an excitation winding and an induction winding; the excitation winding is located outside the box of the liquid to be tested, and the excitation winding is used to generate an alternating magnetic field; the induction winding is located inside the box; the induction winding is used to generate an induced electromotive force according to the alternating magnetic field; the detection probe is arranged in the liquid to be tested; the detection probe is electrically connected to the induction winding; wherein the electrical parameter value of the detection probe is related to the temperature of the liquid to be tested; the background terminal device is connected to the excitation winding, and the background terminal device is used to detect the first current of the excitation winding, and determine the actual temperature of the liquid to be tested according to the first current and the induced electromotive force. The technical solution of the present invention can more accurately detect the actual temperature of the liquid to be tested.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature monitoring, and in particular to a temperature monitoring device and method. Background Art

[0002] Some electrical components, such as transformers, generate a lot of heat during operation. In order to ensure the normal operation of electrical components, liquid can be placed around the electrical components to cool them down. For example, oil-immersed transformers use transformer oil to dissipate heat during operation.

[0003] During the operation of electrical devices, the temperature of the liquid around the electrical devices can reflect the temperature of the electrical devices. By monitoring the temperature of the liquid, the status of the electrical devices can be monitored in real time to protect the electrical devices. For example, when monitoring the temperature of transformer oil, in order to prevent oil leakage, the sensors of the oil temperature monitoring device are placed outside the transformer oil tank; by setting a temperature bag on the wall of the oil tank, the sensor is placed in the temperature bag, which is not in direct contact with the transformer oil, but through heat conduction, the transformer oil temperature is transferred to the tank wall, and then from the temperature bag on the tank wall to the sensor of the monitoring device.

[0004] However, after several heat conductions, the temperature will actually decay, so the oil temperature monitoring device cannot accurately measure the actual transformer oil temperature. And at this time, the oil temperature monitoring device can only detect the temperature of the transformer oil at the position close to the box wall where the temperature package is installed. Therefore, the existing monitoring device cannot accurately determine the actual temperature of the liquid. Summary of the invention

[0005] The present invention provides a temperature monitoring device and method to solve the problem that the existing monitoring device cannot accurately determine the actual temperature of the liquid.

[0006] According to one aspect of the present invention, a temperature monitoring device is provided, the temperature monitoring device comprising: a sensor module, a detection probe and a background terminal device; the sensor module comprises an excitation winding and an induction winding;

[0007] The excitation winding is located outside the box of the liquid to be tested, and the excitation winding is used to generate an alternating magnetic field;

[0008] The induction winding is located inside the box; the induction winding is used to generate an induced electromotive force according to the alternating magnetic field;

[0009] The detection probe is disposed in the liquid to be detected; the detection probe is electrically connected to the induction winding; wherein the electrical parameter value of the detection probe is related to the temperature of the liquid to be detected;

[0010] The background terminal device is connected to the excitation winding, and is used to detect a first current of the excitation winding, and determine the actual temperature of the liquid to be measured according to the first current and the induced electromotive force.

[0011] Optionally, the background terminal device includes a current detection module and a control module;

[0012] The current detection module is connected to the excitation winding, and the current detection module is used to detect a first current of the excitation winding;

[0013] The control module is connected to the current detection module, and the control module is used to determine the actual temperature of the liquid to be measured according to the first current and the induced electromotive force.

[0014] Optionally, the sensing module further includes: a first magnetic core and a second magnetic core;

[0015] The first magnetic core is located outside the box, and is arranged around the excitation winding; the first magnetic core includes a first side wall, and a second side wall and a third side wall adjacent to the first side wall; the second side wall is opposite to the third side wall, and the second side wall and the third side wall are in contact with the box;

[0016] The second magnetic core is located on the inner side of the box, and the second magnetic core is arranged around the induction winding; the second magnetic core includes a fourth side wall, and a fifth side wall and a sixth side wall adjacent to the fourth side wall; the fifth side wall is opposite to the sixth side wall, and the fifth side wall and the sixth side wall are in contact with the box.

[0017] Optionally, the background terminal device further includes: an excitation power supply;

[0018] The excitation power supply is electrically connected to the excitation winding; the excitation power supply is used to output an alternating current to the excitation winding so that the excitation winding generates the alternating magnetic field; wherein the excitation winding is arranged opposite to the induction winding.

[0019] Optionally, the box body includes a first box wall;

[0020] The first box wall is located between the excitation winding and the induction winding, and a portion of the first box wall opposite to the excitation winding is a non-magnetic steel plate; the excitation winding and the induction winding are symmetrically arranged with respect to the first box wall;

[0021] Alternatively, the box cover of the box body is located between the excitation winding and the induction winding, and the box cover is a non-magnetic steel plate; the excitation winding and the induction winding are symmetrically arranged about the box cover.

[0022] Optionally, the detection probe comprises a platinum thermal resistor, and the resistance of the detection probe is related to the temperature of the liquid to be detected;

[0023] The control module is used to determine the second current of the induction winding according to the first current and the turns ratio of the excitation winding to the induction winding, determine the actual resistance of the detection probe according to the second current and the induced electromotive force, and determine the actual temperature according to the actual resistance.

[0024] Optionally, the sensing module further comprises: a calibration unit;

[0025] The calibration unit is connected between the detection probe and the induction winding, and the control module is used to determine the second current of the induction winding according to the first current and the turns ratio of the excitation winding to the induction winding, and determine the actual resistance of the detection probe according to the second current, the resistance of the calibration unit and the induced electromotive force, and determine the actual temperature according to the actual resistance.

[0026] Optionally, the calibration unit comprises a variable resistor;

[0027] The variable resistor is connected between the detection probe and the induction winding.

[0028] Optionally, the background terminal device further includes: a power supply module, the power supply module is electrically connected to the excitation power supply;

[0029] The background terminal device also includes: a display module, which is connected to the control module and is used to display the actual temperature.

[0030] Optionally, the background terminal device further includes an input module, the input module is connected to the control module, the control module is connected to the power module, and the control module is used to adjust the electrical signal output by the power module according to the input information of the input module;

[0031] The background terminal device also includes an output module, which is connected to the control module and is used to output the actual temperature to an external device.

[0032] According to another aspect of the present invention, a temperature monitoring method is provided, and the method is implemented by the temperature monitoring device described in any embodiment of the present invention, and the temperature monitoring device comprises: a sensor module, a detection probe and a background terminal device; the sensor module comprises an excitation winding and an induction winding; the excitation winding is located outside the box of the liquid to be tested; the induction winding is located inside the box; the detection probe is arranged in the liquid to be tested; the detection probe is electrically connected to the induction winding; the background terminal device is connected to the excitation winding;

[0033] The method is executed by the background terminal device, and the method includes:

[0034] Determine a second current of the induction winding according to a first current detected by the background terminal device and a turns ratio between the excitation winding and the induction winding;

[0035] The actual resistance value of the detection probe is determined according to the second current and the induced electromotive force generated by the induction winding, and the actual temperature is determined according to the actual resistance value.

[0036] According to the technical solution of the embodiment of the present invention, the excitation winding can generate an alternating magnetic field, and the induction winding can generate an induced electromotive force according to the alternating magnetic field. The induction winding can be connected in series with the detection probe to form a loop, thereby generating an induced current. When the temperature of the liquid to be tested in which the detection probe is located changes, the electrical parameter value of the detection probe will change, and the induced current of the detection probe and the induction winding will change. The background terminal device obtains the first current of the excitation winding in real time or periodically, and the background terminal device can calculate the induced current of the induction winding according to the first current. The electrical parameter value (for example, the resistance value) of the detection probe can be determined according to the induced electromotive force and the induced current of the induction winding, so that the actual temperature of the liquid to be tested can be determined according to the electrical parameter value of the detection probe. In addition, the excitation winding is located on the outside of the box, and the induction winding is located on the inside of the box. The excitation winding and the induction winding are opposite to each other, so that the induction winding can generate an induced electromotive force, thereby eliminating the need to punch holes in the box. In addition, the detection probe is arranged in the liquid to be tested, which can more accurately detect the actual temperature of the liquid to be tested, and achieve better temperature monitoring of the electrical components in the liquid to be tested, so that it can be discovered in time when the temperature of the electrical components is abnormal.

[0037] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 is a structural schematic diagram of a temperature monitoring device provided by an embodiment of the present invention;

[0040] Figure 2 is a structural schematic diagram of another temperature monitoring device provided by an embodiment of the present invention;

[0041] Figure 3 is a partial enlarged view of a temperature monitoring device provided by an embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of magnetic force line distribution provided by an embodiment of the present invention;

[0043] Figure 5 is a structural schematic diagram of another temperature monitoring device provided by an embodiment of the present invention;

[0044] Figure 6 is an equivalent circuit diagram of a temperature monitoring device provided by an embodiment of the present invention;

[0045] Figure 7 is a curve diagram showing the relationship between the resistance and temperature of a platinum thermal resistor provided by an embodiment of the present invention;

[0046] Figure 8 is a structural schematic diagram of another temperature monitoring device provided by an embodiment of the present invention;

[0047] Fig. 9 It is a flow chart of a temperature monitoring method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0049] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0050] In view of the problem that the existing monitoring device cannot accurately determine the actual temperature of the liquid, an embodiment of the present invention provides a temperature monitoring device. Figure 1 is a schematic diagram of a temperature monitoring device provided by an embodiment of the present invention, with reference to Figure 1 , the temperature monitoring device includes: a sensor module 10, a detection probe 20 and a background terminal device 30; the sensor module 10 includes an excitation winding 101 and an induction winding 102;

[0051] The exciting winding 101 is located outside the box 40 of the liquid to be tested, and the exciting winding 101 is used to generate an alternating magnetic field;

[0052] The induction winding 102 is located inside the box 40; the induction winding 102 is used to generate an induced electromotive force according to the alternating magnetic field;

[0053] The detection probe 20 is disposed in the liquid to be detected; the detection probe 20 is electrically connected to the induction winding 102; wherein the electrical parameter value of the detection probe 20 is related to the temperature of the liquid to be detected;

[0054] The background terminal device 30 is connected to the exciting winding 101 , and is used to detect the first current of the exciting winding 101 , and determine the actual temperature of the liquid to be measured according to the first current and the induced electromotive force.

[0055] The box 40 is provided with an electrical component, which may be a transformer or a power converter, etc. The box 40 is provided with a liquid to be tested, which may be oil or a coolant, etc. The liquid to be tested is arranged around the electrical component to cool the electrical component.

[0056] The excitation winding 101 may be a spiral coil wound by an electromagnetic wire, and the electromagnetic wire may be a copper wire or an enameled wire, etc. The induction winding 102 may be a spiral coil wound by an electromagnetic wire. The winding direction of the excitation winding 101 may be the same as or different from the winding direction of the induction winding 102, which is not limited in this embodiment. The induction winding 102 may be located near the wall or cover of the box body 40, and the induction winding 102 is not arranged in the liquid to be measured, thereby avoiding damage to the induction winding 102. The distance between the excitation winding 101 and the induction winding 102 is relatively close, so that the induction winding 102 can generate an induced electromotive force according to the alternating magnetic field of the excitation winding 101.

[0057] The back-end terminal device 30 is arranged outside the box body 40. The inner side of the box body 40 is a side where the liquid to be tested and the electrical components are arranged, and the outer side of the box body 40 is a side where the liquid to be tested is not arranged. The back-end terminal device 30 can collect the first current of the excitation winding 101 in real time or periodically, and determine the electrical parameter value of the detection probe 20 according to the first current and the induced electromotive force generated by the induction winding 102, so as to determine the actual temperature of the liquid to be tested where the detection probe 20 is located according to the electrical parameter value of the detection probe 20 and the relationship between the electrical parameter value of the detection probe 20 and the temperature.

[0058] The detection probe 20 is set in the liquid to be tested, and the electrical parameter value of the detection probe 20 is related to the temperature of the liquid to be tested, that is, when the temperature of the liquid to be tested where the detection probe 20 is located changes, the electrical parameter value of the detection probe 20 will change, and the electrical parameter value of the detection probe 20 is obtained by calculation. Combined with the electrical parameter value of the detection probe 20 and the corresponding relationship between the electrical parameter value of the detection probe 20 and the temperature, the actual temperature of the liquid to be tested can be obtained. The detection probe 20 can be a thermistor or a platinum thermal resistor, and the electrical parameter value includes a resistance value, which is not limited in this embodiment. The detection probe 20 can be electrically connected to the induction winding 102 through an internal sensing line.

[0059] Specifically, after the excitation winding 101 is energized, for example, after alternating current is transmitted to the excitation winding 101, the excitation winding 101 will generate an alternating magnetic field. When the induction winding 102 is in the alternating magnetic field, the induction winding 102 will generate an induced electromotive force according to the alternating magnetic field. The induction winding 102 can be connected in series with the detection probe 20 to form a loop, thereby generating an induced current. When the temperature of the liquid to be tested in which the detection probe 20 is located changes, the electrical parameter value of the detection probe 20 will change, and the induced current of the detection probe 20 and the induction winding 102 will change. The background terminal device 30 obtains the first current of the excitation winding 101 in real time or periodically. The background terminal device 30 can calculate the induced current of the induction winding 102 based on the first current, and the electrical parameter value (for example, resistance value) of the detection probe 20 can be determined based on the induced electromotive force and induced current of the induction winding 102, so that the actual temperature of the liquid to be tested can be determined based on the electrical parameter value of the detection probe 20.

[0060] Furthermore, the excitation winding 101 is located on the outside of the box 40, and the induction winding 102 is located on the inside of the box 40. The excitation winding 101 and the induction winding 102 are opposite to each other so that the induction winding 102 can generate an induced electromotive force, thereby eliminating the need for direct electrical connection and the need for punching holes in the box 40, thereby ensuring the integrity of the box 40 and better protecting the electrical components in the box 40. The backend terminal device 30 does not need to be electrically connected to the detection probe 20 in the box 40, and can more conveniently monitor the temperature of the liquid to be tested. Moreover, by setting the detection probe 20, and setting the detection probe 20 in the liquid to be tested, the actual temperature of the liquid to be tested can be more accurately detected, and better temperature monitoring of the electrical components in the box 40 can be achieved, so that abnormal temperature of the electrical components can be discovered in time.

[0061] In the technical solution of this embodiment, the excitation winding can generate an alternating magnetic field, and the induction winding can generate an induced electromotive force according to the alternating magnetic field. The induction winding can be connected in series with the detection probe to form a loop, thereby generating an induced current. When the temperature of the liquid to be tested in which the detection probe is located changes, the electrical parameter value of the detection probe will change, and the induced current of the detection probe and the induction winding will change. The background terminal device obtains the first current of the excitation winding in real time or periodically, and the background terminal device can calculate the induced current of the induction winding according to the first current. The electrical parameter value (for example, the resistance value) of the detection probe can be determined according to the induced electromotive force and the induced current of the induction winding, so that the actual temperature of the liquid to be tested can be determined according to the electrical parameter value of the detection probe. In addition, the excitation winding is located on the outside of the box, and the induction winding is located on the inside of the box. The excitation winding and the induction winding are opposite to each other, so that the induction winding can generate an induced electromotive force, so there is no need to punch holes in the box. In addition, the detection probe is set in the liquid to be tested, which can more accurately detect the actual temperature of the liquid to be tested, and achieve better temperature monitoring of the electrical components in the liquid to be tested, so that it can be discovered in time when the temperature of the electrical components is abnormal.

[0062] Based on the above technical solutions, Figure 2 is a schematic diagram of the structure of another temperature monitoring device provided by an embodiment of the present invention. Figure 2 , the background terminal device 30 includes a current detection module 301 and a control module 302;

[0063] The current detection module 301 is connected to the excitation winding 101, and the current detection module 301 is used to detect the first current of the excitation winding 101;

[0064] The control module 302 is connected to the current detection module 301 , and is used to determine the actual temperature of the liquid to be measured according to the first current and the induced electromotive force.

[0065] Specifically, the current detection module 301 can be an ammeter or a current transformer, etc., and the current detection module 301 can detect the first current of the excitation winding 101 in real time or periodically. The current detection module 301 can be electrically connected to the excitation winding 101 through an external sensing line. The control module 302 can be a processor or a single-chip microcomputer, etc., and the processor can be a computer or a host computer, etc. The control module 302 can calculate the electrical parameter value of the detection probe 20 according to the first current of the excitation winding 101 and the induced electromotive force of the induction winding 102, thereby determining the actual temperature of the liquid to be measured.

[0066] Optionally, refer to Figure 2 , the sensing module 10 further includes: a first magnetic core 103 and a second magnetic core 104;

[0067] The first magnetic core 103 is located outside the box body 40, and is disposed around the excitation winding 101; the first magnetic core 103 includes a first side wall A1, and a second side wall A2 and a third side wall A3 adjacent to the first side wall A1; the second side wall A2 is opposite to the third side wall A3, and the second side wall A2 and the third side wall A3 are in contact with the box body 40;

[0068] The second magnetic core 104 is located on the inner side of the box body 40, and the second magnetic core 104 is arranged around the induction winding 102; the second magnetic core 104 includes a fourth side wall A4, and a fifth side wall A5 and a sixth side wall A6 adjacent to the fourth side wall A4; the fifth side wall A5 is opposite to the sixth side wall A6, and the fifth side wall A5 and the sixth side wall A6 are in contact with the box body 40.

[0069] Specifically, the first magnetic core 103 is arranged around the excitation winding 101, and the first magnetic core 103 covers the excitation winding 101, so that the first magnetic core 103 can constrain the magnetic field of the excitation winding 101, reduce the attenuation of the magnetic field, and avoid other devices from affecting the magnetic field of the excitation winding 101, and can strengthen the magnetic field and improve the working efficiency of the temperature monitoring device. Similarly, the second magnetic core 104 is arranged around the induction winding 102, and the second magnetic core 104 covers the induction winding 102, so that the second magnetic core 104 can constrain the magnetic field of the induction winding 102, reduce the attenuation of the magnetic field, and improve the working efficiency of the temperature monitoring device.

[0070] Figure 3 is a partial enlarged view of a temperature monitoring device provided by an embodiment of the present invention. Optionally, Figure 3 As shown, the first magnetic core 103 and the second magnetic core 104 are arranged opposite to each other, and the first magnetic core 103 and the second magnetic core 104 are symmetrically arranged relative to the box wall of the box body 40 between the first magnetic core 103 and the second magnetic core 104, so that the magnetic flux can be closed in the first magnetic core 103 and the second magnetic core 104 to form a closed magnetic circuit. Figure 4 is a schematic diagram of magnetic force line distribution provided by an embodiment of the present invention, such as Figure 4 As shown, the magnetic flux is closed in the first magnetic core 103 and the second magnetic core 104 to form a closed magnetic circuit, thereby ensuring the stability of the magnetic field, facilitating the collection of the first current, and further realizing the monitoring of the actual temperature of the liquid to be measured.

[0071] It should be noted that Figure 3 and Figure 4 The direction of the magnetic field lines is for illustration only and does not limit the direction of the magnetic field lines.

[0072] Based on the above technical solutions, Figure 5 is a schematic diagram of the structure of another temperature monitoring device provided by an embodiment of the present invention. Figure 5, the background terminal device 30 also includes: an excitation power supply 303;

[0073] The excitation power supply 303 is electrically connected to the excitation winding 101 ; the excitation power supply 303 is used to output an alternating current to the excitation winding 101 so that the excitation winding 101 generates an alternating magnetic field.

[0074] Specifically, the excitation power supply 303 can be an AC power supply, outputting an alternating current to the excitation winding 101, so that the excitation winding 101 can generate an alternating magnetic field. The voltage amplitude transmitted from the excitation power supply 303 to the excitation winding 101 is set, and the induced electromotive force of the induction winding 102 can be calculated according to the first voltage of the excitation winding 101, so that the control module 302 can calculate the induced current according to the first current, calculate the induced electromotive force according to the first voltage, and then calculate the actual resistance of the detection probe 20 according to the induced current and the induced electromotive force, and then determine the actual temperature of the liquid to be tested, realize the temperature monitoring of the liquid to be tested, and then realize the real-time monitoring of the temperature of the electrical components in the box 40.

[0075] Optionally, the excitation power supply 303 , the current detection module 301 and the excitation winding 101 are connected in series to form a loop, so that current flows through the excitation winding 101 to generate an alternating magnetic field, and the current detection module 301 detects the first current of the excitation winding 101 .

[0076] The exciting winding 101 is arranged opposite to the inductive winding 102. In this way, the inductive winding 102 can be ensured to be in the alternating magnetic field of the exciting winding 101, so that the inductive winding 102 can generate an induced electromotive force.

[0077] Optionally, refer to Figure 5 , the box body 40 includes a first box wall 401;

[0078] The first box wall 401 is located between the excitation winding 101 and the induction winding 102. The portion of the first box wall 401 opposite to the excitation winding 101 is a non-magnetic steel plate. The excitation winding 101 and the induction winding 102 are symmetrically arranged about the first box wall 401.

[0079] Alternatively, the box cover 402 of the box body 40 is located between the excitation winding 101 and the induction winding 102 , and the box cover 402 is a non-magnetic steel plate; the excitation winding 101 and the induction winding 102 are symmetrically arranged about the box cover 402 .

[0080] Specifically, by setting the first box wall 401 or the box cover 402 between the excitation winding 101 and the induction winding 102 to a non-magnetic steel plate, the interference of the box body 40 to the magnetic field can be avoided, and the magnetic loss can be reduced. The first current of the excitation winding 101 can be detected more accurately, and the actual temperature of the liquid to be tested can be determined more accurately, thereby determining the temperature of the electrical components in the box body 40.

[0081] Furthermore, the exciting winding 101 and the inductive winding 102 are symmetrically arranged with respect to the first box wall 401 or the box cover 402. In this way, the area directly facing each other between the exciting winding 101 and the inductive winding 102 can be made larger, so that the induced electromotive force generated by the inductive winding 102 can be ensured to be larger, which is convenient for determining the electrical parameter value of the detection probe 20, and can reduce the error, so as to achieve more accurate determination of the actual temperature of the liquid to be measured.

[0082] Optionally, refer to Figure 5 , the detection probe 20 includes a platinum thermal resistor PT, and the resistance value of the detection probe 20 is related to the temperature of the liquid to be tested;

[0083] The control module 302 is used to determine the second current of the induction winding 102 according to the first current and the turns ratio of the excitation winding 101 and the induction winding 102, determine the actual resistance of the detection probe 20 according to the second current and the induced electromotive force, and determine the actual temperature according to the actual resistance.

[0084] Specifically, the resistance of the platinum thermal resistor PT will change with the change of temperature. For example, at 0°C, the resistance of the platinum thermal resistor PT is 100 ohms, and at 100°C, the resistance of the platinum thermal resistor PT is about 138.5 ohms. In the temperature range of 0-100°C, the resistance of the platinum thermal resistor PT will change linearly, so that the actual temperature of the liquid to be tested can be determined according to the actual resistance of the detection probe 20.

[0085] The control module 302 can determine the second current (induced current) of the induction winding 102 according to the first current and the turns ratio of the excitation winding 101 and the induction winding 102. The induction winding 102 is connected in series with the detection probe 20, and the current flowing through the detection probe 20 is also the second current. The actual resistance of the detection probe 20 is determined according to the second current and the induced electromotive force. According to the corresponding relationship between the resistance and temperature of the detection probe 20, the actual temperature of the detection probe 20 can be determined, that is, the actual temperature of the liquid to be measured.

[0086] Optionally, refer to Figure 5 , the sensing module 10 further includes: a calibration unit 105;

[0087] The calibration unit 105 is connected between the detection probe 20 and the induction winding 102. The control module 302 is used to determine the second current of the induction winding 102 according to the first current and the turns ratio of the excitation winding 101 and the induction winding 102, and to determine the actual resistance of the detection probe 20 according to the second current, the resistance of the calibration unit 105 and the induced electromotive force, and to determine the actual temperature according to the actual resistance.

[0088] Specifically, the calibration unit 105 is connected between the detection probe 20 and the induction winding 102. The induction winding 102, the detection probe 20 and the calibration unit 105 are connected in series to form a loop. By setting the calibration unit 105, the second current can be adjusted to avoid the second current being too large or too small.

[0089] The control module 302 can determine the induced electromotive force of the induction winding 102 according to the first voltage of the excitation winding 101 and the turns ratio of the excitation winding 101 to the induction winding 102, and determine the second current of the induction winding 102 according to the first current and the turns ratio of the excitation winding 101 to the induction winding 102. Therefore, the sum of the resistance values ​​of the calibration unit 105 and the detection probe 20 can be determined according to the induced electromotive force of the induction winding 102 and the second current of the induction winding 102, and the actual resistance value of the detection probe can be obtained by subtracting the resistance value of the calibration unit 105.

[0090] Optionally, refer to Figure 5 , the calibration unit 105 includes a variable resistor R1, and the variable resistor R1 is connected between the detection probe 20 and the induction winding 102. In this way, the resistance value of the variable resistor R1 can be set differently in different environments, so as to adapt to different use environments. For example, when the box wall of the box body 40 is thicker, the resistance value of the variable resistor R1 can be set smaller to avoid the second current being smaller, that is, to avoid the first current being smaller and inconvenient to detect. For example, when the connecting line between the detection probe 20 and the variable resistor R1 is longer, the loss is larger, and the resistance value of the variable resistor R1 can be set smaller to avoid the second current being smaller. In this way, the accuracy of the first current detection can be further improved, thereby improving the accuracy of the actual temperature, and the applicability of the temperature monitoring device can be improved.

[0091] For example, Figure 6 is an equivalent circuit diagram of a temperature monitoring device provided by an embodiment of the present invention, referring to Figure 6 , the current detection module 301, the excitation power supply 303 and the excitation winding 101 are connected in series to form a first circuit, the first current flowing in the first circuit is the first current I1, the induction winding 102, the platinum thermal resistor PT and the variable resistor R1 are connected in series to form a second circuit, the current flowing in the second circuit is the second current I2, the number of turns of the excitation winding 101 is N1, and the number of turns of the induction winding 102 is N2. The voltage output by the excitation power supply 303 is the first voltage U1, and the induced electromotive force generated by the induction winding 102 is U2. The induced electromotive force U2 can be determined according to the first voltage U1 and the turns ratio of the excitation winding 101 and the induction winding 102. The induced electromotive force is The second current I2 of the induction winding 102 is determined according to the first current I1 and the turns ratio of the excitation winding 101 to the induction winding 102. The sum of the resistance of the platinum thermal resistor PT and the variable resistor R1 is For example, if the resistance of the platinum thermal resistor PT is R and the resistance of the variable resistor R1 is R1, then the resistance of the platinum thermal resistor PT is In this way, the actual resistance value of the detection probe 20 (platinum thermal resistor PT) can be calculated.

[0092] For example, Figure 7 : is a curve diagram showing the relationship between the resistance and temperature of a platinum thermal resistor provided in an embodiment of the present invention, such as Figure 7 As shown, the temperature of the platinum thermal resistor is proportional to its resistance. Therefore, after calculating the actual resistance of the platinum thermal resistor, the actual temperature of the platinum thermal resistor can be determined according to the corresponding relationship between the resistance and temperature of the platinum thermal resistor, that is, the actual temperature of the liquid to be measured.

[0093] On the basis of the above technical solutions, Figure 8 is a schematic diagram of the structure of another temperature monitoring device provided by an embodiment of the present invention. Figure 8 The backend terminal device 30 also includes: a power supply module 304 , which is electrically connected to the excitation power supply 303 .

[0094] Specifically, the power module 304 may include a power chip or a power circuit. The power module 304 may be connected to an external power source, and the power module 304 may convert the voltage of the external power source, such as reducing the voltage, or performing power regulation, so as to output a voltage to the excitation power source 303, so that the excitation power source 303 outputs an alternating current of a preset amplitude to the excitation winding 101, so that the excitation winding 101 generates an alternating magnetic field.

[0095] like Figure 8 As shown, the first terminal B1 of the power module 304 and the second terminal B2 of the power module 304 are connected to an external power source.

[0096] Optionally, the power module 304 is also connected to a power terminal of the control module 302 to supply power to the control module 302 .

[0097] Optionally, the power supply module 304 is also connected to a power supply terminal of the current detection module 301 to supply power to the current detection module 301 .

[0098] Optionally, refer to Figure 8 The backend terminal device 30 also includes: a display module 305, the display module 305 is connected to the control module 302, and the display module 305 is used to display the actual temperature.

[0099] Specifically, the display module 305 can display the actual temperature in real time, which is convenient for monitoring the temperature of the electrical device and timely discovering when the temperature of the electrical device is abnormal. The display module 305 can include a liquid crystal display or an organic light emitting diode display, or other display devices, which is not limited in this embodiment.

[0100] Optionally, the power module 304 is also connected to a power terminal of the display module 305 to supply power to the display module 305 .

[0101] Optionally, refer to Figure 8 The backend terminal device 30 also includes an input module 306 , which is connected to the control module 302 , and the control module 302 is connected to the power module 304 . The control module 302 is used to adjust the electrical signal output by the power module 304 according to the input information of the input module 306 .

[0102] Specifically, the input module 306 may include input devices such as buttons, so that input information can be transmitted to the control module 302 through the input module 306, so that the control module 302 adjusts the electrical signal output by the power module 304 according to the input signal. The input information may include the amplitude of the voltage output by the power module 304, so that the amplitude of the electrical signal output by the power module 304 can be adjusted, so that the first voltage of the excitation winding 101 is a set voltage value, which is convenient for determining the induced electromotive force, and then determining the actual resistance of the detection probe 20. The input information may also include the current, power or phase of the electrical signal output by the power module 304, which is not limited in this embodiment.

[0103] Optionally, refer to Figure 8 The backend terminal device 30 also includes an output module 307, which is connected to the control module 302 and is used to output the actual temperature to an external device.

[0104] Specifically, the output module 307 can be a communication module, for example, including a Bluetooth communication circuit, a WiFi communication circuit, a serial bus (such as RS485 or RS232, etc.) communication circuit or a universal serial bus (USB) communication circuit, etc., so as to transmit the actual temperature to an external device through the communication circuit. The output module 307 can also include a digital-to-analog conversion circuit, so that an analog signal can be output to an external device. In this way, it is convenient to monitor the actual temperature in real time, and the actual temperature can also be stored, which is convenient for analyzing the working characteristics of the electrical device in the liquid to be tested.

[0105] The embodiment of the present invention further provides a temperature monitoring method, which can be implemented by the temperature monitoring device provided by any implementation scheme of the present invention, and can be executed by the background terminal device 30 in the temperature monitoring device provided by any implementation scheme of the present invention. Fig. 9 is a flow chart of a temperature monitoring method provided by an embodiment of the present invention, refer to Fig. 9 , temperature monitoring methods include:

[0106] S501. Determine a second current of the induction winding according to a first current detected by a background terminal device and a turns ratio between an excitation winding and an induction winding.

[0107] Specifically, Figure 1 As shown, the backend terminal device 30 can determine the second current of the induction winding 102 according to the first current of the excitation winding 101 and the turns ratio of the excitation winding 101 to the induction winding 102. For example, the first current is I1, the second current is I2, the number of turns of the excitation winding 101 is N1, and the number of turns of the induction winding 102 is N2, then the second current of the induction winding 102 is .

[0108] S502: Determine the actual resistance of the detection probe according to the second current and the induced electromotive force generated by the induction winding, and determine the actual temperature according to the actual resistance.

[0109] Specifically, Figure 1 As shown, the background terminal device 30 calculates the ratio of the induced electromotive force generated by the induction winding 102 to the second current, and can determine the actual resistance of the detection probe 20. The resistance of the detection probe 20 changes with the change of temperature. Therefore, according to the actual resistance of the detection probe 20 and the corresponding relationship between the resistance of the detection probe 20 and the temperature, the actual temperature of the detection probe 20, that is, the actual temperature of the liquid to be tested, can be determined, so that the temperature of the electrical device in the liquid to be tested can be monitored.

[0110] Furthermore, the excitation winding 101 is located on the outside of the box 40, and the induction winding 102 is located on the inside of the box 40. The excitation winding 101 and the induction winding 102 are opposite to each other so that the induction winding 102 can generate an induced electromotive force, thereby eliminating the need for direct electrical connection and the need for punching holes in the box 40, thereby ensuring the integrity of the box 40 and better protecting the electrical components in the box 40. The background terminal device 30 does not need to be electrically connected to the detection probe 20 in the box 40, and can more conveniently monitor the temperature of the liquid to be tested. Moreover, by setting the detection probe 20, and the detection probe 20 is set in the liquid to be tested, the actual temperature of the liquid to be tested can be more accurately detected, and better temperature monitoring of the electrical components in the liquid to be tested can be achieved, so that abnormal temperature of the electrical components can be discovered in time.

[0111] Optionally, before S501, determining the second current of the induction winding according to the first current detected by the background terminal device and the turns ratio of the excitation winding to the induction winding, the temperature monitoring method further includes:

[0112] The induced electromotive force of the induction winding is determined according to the first voltage of the excitation winding and the turns ratio of the excitation winding to the induction winding.

[0113] Specifically, the first voltage of the excitation winding 101 is U1, the number of turns of the excitation winding 101 is N1, and the number of turns of the induction winding 102 is N2. Then, according to the first voltage U1 and the turns ratio of the excitation winding 101 to the induction winding 102, the induced electromotive force U2 of the induction winding 102 can be determined. The induced electromotive force is .

[0114] The technical solution of this embodiment is to set an excitation winding and an induction winding. After the excitation winding generates an alternating magnetic field, the induction winding can generate an induced electromotive force according to the alternating magnetic field, and the specific value of the induced electromotive force of the induction winding is determined according to the first voltage of the excitation winding and the turns ratio of the excitation winding to the induction winding. And the second current of the induction winding can be determined according to the first current of the excitation winding collected by the background terminal device and the turns ratio of the excitation winding to the induction winding, and then the actual resistance value of the detection probe is determined according to the induced electromotive force and the second current of the induction winding. According to the actual resistance value of the detection probe, the actual temperature of the detection probe can be determined, that is, the actual temperature of the liquid to be tested, so that the temperature of the electrical device in the liquid to be tested can be determined, which is convenient for monitoring the temperature of the liquid to be tested and the electrical device. In addition, the detection probe can be immersed in the liquid to be tested, so that the measured actual temperature is more accurate, which improves the accuracy of temperature monitoring of the liquid to be tested and the electrical device.

[0115] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0116] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A temperature monitoring device, characterized in that: include: A sensing module, a detection probe and a background terminal device; the sensing module includes an excitation winding and an induction winding; The excitation winding is located outside the box of the liquid to be tested, and the excitation winding is used to generate an alternating magnetic field; The induction winding is located inside the box; the induction winding is used to generate an induced electromotive force according to the alternating magnetic field; The detection probe is disposed in the liquid to be detected; the detection probe is electrically connected to the induction winding; wherein the electrical parameter value of the detection probe is related to the temperature of the liquid to be detected; The background terminal device is connected to the excitation winding, and is used to detect a first current of the excitation winding, and determine the actual temperature of the liquid to be measured according to the first current and the induced electromotive force; The background terminal device includes a current detection module and a control module; The current detection module is connected to the excitation winding, and the current detection module is used to detect a first current of the excitation winding; The control module is connected to the current detection module; The resistance value of the detection probe is related to the temperature of the liquid to be tested; The control module is used to determine the second current of the induction winding according to the first current and the turns ratio of the excitation winding to the induction winding, determine the actual resistance of the detection probe according to the second current and the induced electromotive force, and determine the actual temperature according to the actual resistance.

2. The temperature monitoring device according to claim 1, characterized in that: The sensing module further includes: a first magnetic core and a second magnetic core; The first magnetic core is located outside the box, and is arranged around the excitation winding; the first magnetic core includes a first side wall, and a second side wall and a third side wall adjacent to the first side wall; the second side wall is opposite to the third side wall, and the second side wall and the third side wall are in contact with the box; The second magnetic core is located on the inner side of the box, and the second magnetic core is arranged around the induction winding; the second magnetic core includes a fourth side wall, and a fifth side wall and a sixth side wall adjacent to the fourth side wall; the fifth side wall is opposite to the sixth side wall, and the fifth side wall and the sixth side wall are in contact with the box.

3. The temperature monitoring device according to claim 1, characterized in that: The background terminal device also includes: an excitation power supply; The excitation power supply is electrically connected to the excitation winding; the excitation power supply is used to output an alternating current to the excitation winding so that the excitation winding generates the alternating magnetic field; wherein the excitation winding is arranged opposite to the induction winding.

4. The temperature monitoring device according to claim 1, characterized in that: The box body comprises a first box wall; The first box wall is located between the excitation winding and the induction winding, and a portion of the first box wall opposite to the excitation winding is a non-magnetic steel plate; the excitation winding and the induction winding are symmetrically arranged with respect to the first box wall; Alternatively, the box cover of the box body is located between the excitation winding and the induction winding, and the box cover is a non-magnetic steel plate; the excitation winding and the induction winding are symmetrically arranged about the box cover.

5. The temperature monitoring device according to claim 1, characterized in that: The detection probe comprises a platinum thermal resistor.

6. The temperature monitoring device according to claim 1, characterized in that: The sensing module further includes: a calibration unit; The calibration unit is connected between the detection probe and the induction winding, and the control module is used to determine the second current of the induction winding according to the first current and the turns ratio of the excitation winding to the induction winding, and determine the actual resistance of the detection probe according to the second current, the resistance of the calibration unit and the induced electromotive force, and determine the actual temperature according to the actual resistance.

7. The temperature monitoring device according to claim 6, characterized in that: The calibration unit includes a variable resistor; The variable resistor is connected between the detection probe and the induction winding.

8. The temperature monitoring device according to claim 3, characterized in that: The backend terminal device further comprises: a power supply module, the power supply module being electrically connected to the excitation power supply; The backend terminal device further includes: a display module, the display module is connected to the control module, and the display module is used to display the actual temperature; The backend terminal device further includes an input module, the input module is connected to the control module, the control module is connected to the power module, and the control module is used to adjust the electrical signal output by the power module according to the input information of the input module; The background terminal device also includes an output module, which is connected to the control module and is used to output the actual temperature to an external device.

9. A temperature monitoring method, characterized in that: The method is implemented by the temperature monitoring device according to any one of claims 1 to 8, the temperature monitoring device comprising: a sensor module, a detection probe and a background terminal device; the sensor module comprises an excitation winding and an induction winding; the excitation winding is located outside the box of the liquid to be tested; the induction winding is located inside the box; the detection probe is arranged in the liquid to be tested; the detection probe is electrically connected to the induction winding; the background terminal device is connected to the excitation winding; the method is executed by the background terminal device, and the method comprises: Determine a second current of the induction winding according to a first current detected by the background terminal device and a turns ratio between the excitation winding and the induction winding; The actual resistance value of the detection probe is determined according to the second current and the induced electromotive force generated by the induction winding, and the actual temperature is determined according to the actual resistance value.

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