Electric energy meter and temperature control method

Abstract

The present invention provides an electric energy meter and a temperature control method, comprising an electric energy meter body and a detection device, wherein a connection port is provided on the electric energy meter body, and the detection device is detachably inserted and connected with the connection port to detect the internal temperature of the electric energy meter, wherein the connection port is configured to be coupled and connected with a circuit board and / or a control element inside the electric energy meter, and the detection device comprises a detection body and an insertion end plate, wherein the detection body and the insertion end plate are both wrapped with an insulating layer on the outside, and when the detection device is connected to the connection port, the insertion end plate is inserted into the connection port, and a heat conductive layer and a thermistor are also provided inside the detection body, and the outer side of the thermistor is wrapped by the heat conductive layer and the insulating layer, a connection convex plate is provided inside the connection port, a pressure sensitive element is provided inside the insertion end plate, and a phase change material layer is provided on the connection convex plate, and the outer side of the phase change material layer is wrapped with a film, and when the phase change material undergoes a phase change and melts, the film on the outer side of the phase change material swells, generating pressure on the pressure sensitive element, and the state of the electric energy meter is adjusted in time through the pressure change detected by the pressure sensitive element.

Description

Technical Field

[0001] The present invention relates to the field of electric energy meters, and in particular to an electric energy meter and a temperature control method. Background Art

[0002] The electric energy meter is a key device for electric energy metering and plays a vital role in electricity management. By analyzing the readings of the electric energy meter, the load of the entire power system can be understood, which helps optimize power distribution and reduce energy waste. Temperature changes will affect the characteristic parameters of the components inside the electric energy meter, resulting in deviations in the measured power results, thereby affecting the accuracy of electric energy metering. Especially when the temperature sensor inside the electric energy meter has low accuracy, temperature changes will aggravate its error, resulting in more inaccurate metering results. Therefore, it is necessary to measure the internal temperature of the electric energy meter in a timely and accurate manner. The commonly used electric energy meter temperature measuring device is to set a temperature sensor inside the electric energy meter box or the electric energy meter box body. In order to ensure the accuracy of temperature measurement, the temperature sensor needs to be exposed, which makes the temperature sensor easy to loosen or be contaminated, affecting the accuracy of temperature measurement or losing the temperature measurement effect.

[0003] The patent with the publication number CN110579286B in the prior art discloses a temperature measuring device for an electric energy meter, wherein the electric energy meter has a terminal electrically connected to an object to be measured, and the temperature measuring device comprises: a layered body, wherein the layered body comprises: a heat-conducting layer, which is thermally coupled with the terminal; an insulating layer, which is coated on the outer surface of the heat-conducting layer to electrically insulate the heat-conducting layer and the terminal; and a thermistor, which is arranged on the heat-conducting layer and thermally coupled with the heat-conducting layer. Although the solution seals the thermistor, the overall safety of the device is high, and the thermistor is prevented from being loosened or contaminated, but the temperature inside the electric energy meter needs to be transferred to the internal thermistor through the insulating layer and the heat-conducting layer, and the insulating layer is polyimide, which has poor thermal conductivity. Especially when the temperature of the electric energy meter is high, the temperature at the terminal is also high, and the thermal conductivity of the corresponding insulating layer material drops sharply, which affects the accuracy of the temperature measurement of the thermistor, so that the temperature control is not timely and causes a safety accident. Therefore, how to timely perceive the temperature change inside the electric energy meter is an urgent problem to be solved in this field. Summary of the invention

[0004] In view of this, the present invention aims to provide an electric energy meter and a temperature control method to solve the problems of inaccurate temperature measurement of thermistors and untimely temperature control of the electric energy meter in the prior art.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] An electric energy meter and a temperature control method, comprising an electric energy meter body and a detection device, wherein a connection port is provided on the electric energy meter body, and the detection device is detachably inserted and connected with the connection port to detect the internal temperature of the electric energy meter, wherein the connection port is configured to be coupled and connected with a circuit board and / or a control element inside the electric energy meter, and the detection device comprises a detection body and an insertion end plate, wherein the detection body and the insertion end plate are both wrapped with an insulating layer on the outside, and when the detection device is connected to the connection port, the insertion end plate is inserted into the connection port, and a heat conductive layer and a thermistor are also provided inside the detection body, and the outer side of the thermistor is wrapped by the heat conductive layer and the insulating layer, a connection convex plate is provided inside the connection port, a pressure sensitive element is provided inside the insertion end plate, and a phase change material layer is provided on the connection convex plate, and the outer side of the phase change material layer is wrapped with a film, and when the phase change material undergoes a phase change and melts, the film on the outer side of the phase change material swells, generating pressure on the pressure sensitive element, and the state of the electric energy meter is adjusted in time through the pressure change detected by the pressure sensitive element.

[0007] Furthermore, the number of the insertion end plates is two, and the two insertion end plates are symmetrically arranged back to back.

[0008] Furthermore, a plurality of connection protrusions are arranged inside the connection port, and the insertion end plate is arranged as at least a semi-wrapped structure. When the detection device is connected to the connection port, the insertion end plate wraps the connection protrusions in the connection port.

[0009] Furthermore, the phase change material is paraffin.

[0010] Furthermore, the material of the insulating layer is set to be a polyimide resin added with fluorine-containing graphene, and the thermal conductivity of the insulating layer is 0.55 to 2.4.

[0011] Furthermore, the electric energy meter also includes a control system, a heat dissipation device and a temperature balance module. The control system is electrically connected to the thermistor, the pressure-sensitive element, the heat dissipation device and the temperature balance module. The thermistor and the pressure-sensitive element transmit the detected results to the control system, and the control system controls the heat dissipation device and the temperature balance module to take corresponding actions according to the detected results.

[0012] Furthermore, a heat dissipation fan is arranged near the connection port, the heat dissipation fan is arranged at the lower part of the electric energy meter body, air outlets are arranged on the left and right sides of the heat dissipation fan, and an air inlet is arranged at the lower part of the heat dissipation fan.

[0013] Furthermore, the temperature balancing module includes a heating device and a circulating heat exchange device, wherein the heating device is used to heat the heat exchange medium in the circulating heat exchange device, and the circulating heat exchange device transfers the heat of the heated heat exchange medium to the inside of the electric energy meter.

[0014] Furthermore, the circulating heat exchange device is configured as a membrane heat exchanger.

[0015] A method for controlling the temperature of an electric energy meter, using the electric energy meter described above, when the ambient temperature is normal, the control method comprises the following steps:

[0016] When the internal temperature of the energy meter is T h -ΔT≤T, the heat dissipation control method is started to dissipate heat for the electric energy meter, and the pressure change of the pressure-sensitive element is continuously detected. When the pressure on the pressure-sensitive element changes, the heat dissipation control method is started to dissipate heat inside the electric energy meter;

[0017] When the internal temperature of the energy meter is T d +ΔT≤T≤T h When -ΔT, the heat dissipation is not started, and the normal operation and control of the energy meter are carried out according to the measured temperature value, but the temperature change inside the energy meter and the pressure change of the pressure-sensitive element need to be continuously paid attention to;

[0018] When the internal temperature of the energy meter drops to T d ≤T<T d +ΔT, the normal operation and control of the electric energy meter is carried out according to the measured temperature value;

[0019] When the internal temperature of the energy meter is lower than T d When the meter is abnormal, it means that the meter needs to be inspected and repaired or an alarm should be issued.

[0020] Compared with the prior art, the electric energy meter and control method of the present invention have the following advantages:

[0021] It is set in the connection port of the electric energy meter. When the temperature inside the electric energy meter is high, the phase change material changes from solid phase to liquid phase, causing the membrane to swell. Due to the swelling effect of the membrane, the phase change material part on the connecting convex plate generates pressure on the pressure-sensitive element inside the inserted end plate, causing the pressure-sensitive element inside the inserted end plate to feel the pressure change, thereby triggering the control system to start the heat dissipation control method to dissipate the heat of the electric energy meter. Through the unique structural design of the inserted end plate and the connecting convex plate, although the specific temperature value cannot be accurately detected, the electric energy meter can be controlled and adjusted in time when the temperature inside the electric energy meter is high, avoiding safety accidents caused by untimely temperature control. In addition, the present application directly sets the phase change material on the connecting convex plate inside the electric energy meter, which has a faster and more direct temperature sensing rate inside the electric energy meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the electric energy meter body according to an embodiment of the present invention;

[0023] Figure 2It is a schematic structural diagram of the electric energy meter body according to an embodiment of the present invention from another perspective;

[0024] Figure 3 This is an axial view of the detection device according to an embodiment of the present invention;

[0025] Figure 4 A top view of the detection device according to an embodiment of the present invention;

[0026] Figure 5 A side view of the detection device according to an embodiment of the present invention;

[0027] Figure 6 A cross-sectional view of the detection device according to an embodiment of the present invention (the pop-up module is in a retracted state);

[0028] Figure 7 It is a cross-sectional view of the detection device according to an embodiment of the present invention (the pop-up module is in a pop-up state);

[0029] Figure 8 This is a flow chart of the control method described in an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] Detection device 1, detection body 11, thermistor 110, insertion end plate 12, main board 121, side plate 122, folding plate 123, insulating layer 14, pressure-sensitive element 15, heat-conducting layer 16, pop-up module 17, telescopic rod 171, elastic element 172, rotation drive block 173, spring block 174, electric energy meter body 2, connection port 21, heat dissipation part 22, connection convex plate 23, phase change material layer 24, air outlet 26, air inlet 27. DETAILED DESCRIPTION

[0032] In the following detailed description, numerous specific details are set forth by way of example to provide a thorough understanding of the relevant teachings. However, it is apparent to one skilled in the art that the present teachings can be practiced without such details.

[0033] Terms regarding attachment, coupling, and the like, such as "connected" and "interconnected," refer to a relationship wherein structures are fixed or attached to one another, directly or indirectly, through intermediate structures, as well as movable or rigid attachments or relationships, unless expressly stated otherwise.

[0034] like Figures 1 to 8 As shown, an electric energy meter with automatic temperature adjustment function includes an electric energy meter body 2 and a detection device 1. The electric energy meter body 2 is provided with a connection port 21. The detection device 1 is detachably inserted into the connection port 21 to detect the internal temperature of the electric energy meter, wherein the connection port 21 is configured to be coupled with a circuit board and / or a control element inside the electric energy meter. Figure 1As shown, the detection device 1 includes a detection body 11 and an insertion end plate 12, wherein the detection body 11 and the insertion end plate 12 are wrapped with an insulating layer 14 on the outside to avoid leakage when the detection device is connected to the electric energy meter body for temperature measurement. When the detection device 1 is connected to the connection port 21, the insertion end plate 12 is inserted into the connection port. A heat-conducting layer 16 and a thermistor 110 are also provided inside the detection body 11, and the outside of the thermistor 110 is wrapped by the heat-conducting layer 16 and the insulating layer 14. The temperature inside the detection device 1 is sensed by the insertion end plate 12 and the temperature is transmitted to the thermistor 110. The thermistor 110 converts the temperature into a specific value and feeds it back to the control system, and the control system makes corresponding countermeasures according to the specific temperature value.

[0035] There are two insertion end plates 12, and the two insertion end plates 12 are symmetrically arranged back to back. The insertion end plates 12 are arranged as at least a semi-wrapped structure. When the detection device 1 is inserted into the connection port 21 of the electric energy meter, the insertion end plates 12 wrap the connection convex plates 23 in the connection port. Correspondingly, two connection convex plates 23 are arranged inside the connection port 21. When the detection device 1 is connected to the connection port 21, the connection convex plates 23 are inserted into the corresponding insertion end plates 12 and are adapted to the shape of the insertion end plates 12.

[0036] Preferably, the insert end plate 12 is configured to have a structure with at least three surfaces including the connecting convex plates 23, and the insert end plate 12 is in a long slot-shaped structure in the left-right direction, and the long slot-shaped structure has a notch, which is convenient for precise alignment during insertion and connection. The notches of the two insert end plates 12 are arranged in opposite directions.

[0037] Furthermore, a pressure-sensitive element 15 is also provided in the insertion end plate 12. The pressure-sensitive element 15 is provided on the largest surface (main board 121) on the inner side of the insertion end plate 12. Correspondingly, a phase change material layer 24 is provided at the position corresponding to the connection convex plate 23 and the bottom surface 121. The outer side of the phase change material is wrapped with a film. The phase change material can be selected and filled according to the actual use scenario of the electric energy meter before the electric energy meter leaves the factory. When the phase change material melts, it causes the film to swell, and produces pressure on the pressure-sensitive element at the corresponding position. The pressure-sensitive element 24 can feel the increase in pressure. Therefore, the setting of the pressure-sensitive element can also reflect the temperature inside the electric energy meter to a certain extent, thereby enabling the control system to timely sense the temperature change through the change of the phase change material layer. In this embodiment, the phase change material is directly provided on the connection convex plate inside the electric energy meter, and the temperature sensing rate inside the electric energy meter is faster and more direct.

[0038] As part of the embodiment of the present invention, the number of the insertion end plate and the connection protrusion plate 23 is set as required, and it is only necessary to ensure that the two correspond to each other. For example, both can be set to one or more.

[0039] Specifically, the bottom of the insertion end plate 12 is connected to the detection body 11, and the insertion end plate 12 is set to an upwardly extending structure. The insertion end plate 12 includes a main board 121, a side plate 122 and a folding plate 123, wherein the length direction of the main board 121 is set along the left-right direction, and the length of the main board 121 in the left-right direction is substantially equivalent to the connecting convex plate 23. The side plate 122 is connected to the left and right sides of the main board 121, and the side plate 122 extends forward or backward perpendicular to the main board 121. The folding plate 123 is set on the side of the side plate 122 away from the main board 121, and the folding plate 123 is parallel to the main board 121, and the folding plates 123 on the left and right sides extend and approach each other. A notch is formed between the two folding plates of the same insertion end plate 12, so that the connecting convex plate 23 can accurately enter the inside of the insertion end plate 12 when inserted and connected. Correspondingly, the pressure-sensitive element 15 is set on the side of the main board 121 facing the notch.

[0040] As a preferred embodiment of the present invention, the phase change material can be paraffin with graphene added, and the material of the insulating layer 14 is set to be polyimide resin with fluorine-containing graphene added. Further, in this embodiment, a phase change material with a phase change temperature of about 60-75°C is selected.

[0041] The thermal conductivity of the insulation layer is 0.55-2.4, and the thermal conductivity of the insulation layer decreases and the insulation performance decreases as the temperature increases. Therefore, when the ambient temperature or the temperature inside the electric energy meter is high, the thermal conductivity and insulation performance of the insulation layer may be reduced. In order to avoid leakage accidents, a pop-up module is provided inside the connection port. The pop-up module can pop out the inserted end plate according to instructions to avoid leakage accidents caused by the decrease in the insulation capacity of the insulation layer.

[0042] Specifically, a pop-up module 17 is provided inside the insertion end plate 12, and the pop-up module 17 is connected to the control system of the detection device. The control system of the detection device controls the pop-up module to pop outward according to the instruction to generate a reaction force to push the insertion end plate to disconnect from the connection port 21. A spring block 174 is provided at the end of the pop-up mechanism, and the spring block 174 is set to a rubber material to avoid leakage accidents when contacting the insertion end plate. Further, the pop-up module 17 is arranged inside the space surrounded by the insertion end plate 12, and the pop-up module 17 is arranged inside the detection body 11. The pop-up module 17 includes a telescopic rod 171, an elastic element 172, a rotating drive block 173 and a spring block 174, wherein the rotating drive block 173 is fixed inside the detection body 11 through a driving shaft, the rotating drive block 173 contacts the end of the telescopic rod 171, and the other end of the telescopic rod 171 is connected to the spring block 174, and an elastic element 172 is also provided on the telescopic rod 171, and the lower end of the elastic element 172 is fixedly connected to the telescopic rod 171. When the driving shaft rotates and drives the rotating driving block 173 to rotate counterclockwise, the telescopic rod 171 is pushed upward, the elastic block 174 is pushed out, and the elastic element 172 is compressed. When the driving shaft drives the rotating driving block 173 to rotate clockwise, the elastic element 172 drives the telescopic rod 171 to move downward due to the restoring force, and drives the elastic block 174 to contract.

[0043] Furthermore, the electric energy meter in this embodiment also includes a main control system, a heat dissipation device and a temperature balance module. The main control system is electrically connected to the control system, thermistor, pressure-sensitive element, heat dissipation device and temperature balance module of the detection equipment. The thermistor and pressure-sensitive element transmit the detected results to the control system, and the control system controls the heat dissipation device and the temperature balance module to take corresponding actions according to the detected results.

[0044] The heat dissipation device is configured as a conventional heat sink, heat exchanger or heat dissipation fan, etc. The heat sink, heat exchanger or heat dissipation fan are all commonly used components in the electrical field, and their specific structures are not described here. Preferably, the heat dissipation device is configured as a heat dissipation fan. As shown in the figure, a circuit board, a control system and other heat-prone components are arranged on the upper part of the connection port 21 on the electric energy meter body 2, and a heat dissipation fan is correspondingly arranged near the connection port 21, that is, the heat dissipation fan is arranged at the lower part of the electric energy meter body 2, and air outlets 26 are arranged on the left and right sides of the heat dissipation fan, and an air inlet 27 is arranged at the lower part of the heat dissipation fan, so that the heat dissipation fan can guide air circulation to achieve heat dissipation.

[0045] The temperature balance module includes a heating device and a circulating heat exchange device, wherein the heating device is used to heat the heat exchange medium in the circulating heat exchange device, and the circulating heat exchange device transfers the heat of the heated heat exchange medium to the inside of the electric energy meter. Preferably, the circulating heat exchange device is configured as a membrane heat exchanger.

[0046] As one of the embodiments of the present invention, when the temperature of the electric energy meter is high, the thermal conductivity and insulation performance of the insulation layer are reduced, resulting in the inability to quickly transfer the temperature inside the electric energy meter to the thermistor in the detection device, affecting the temperature measurement accuracy of the thermistor, and then failing to timely sense the high temperature inside the electric energy meter, which can easily lead to safety accidents. The connecting convex plate provided with phase change material causes the membrane to swell due to the phase change material changing from solid phase to liquid phase. Due to the swelling effect of the membrane, the phase change material part on the connecting convex plate generates pressure on the pressure-sensitive element 15 inside the inserted end plate 12, causing the pressure-sensitive element inside the inserted end plate 12 to feel the pressure change, thereby triggering the control system to start running the heat dissipation control method to dissipate the heat of the electric energy meter. Although this solution cannot accurately obtain the specific temperature inside the electric energy meter, it can indicate that the temperature of the electric energy meter is higher than the high temperature threshold value T h Even if the specific temperature value cannot be accurately detected, the temperature of the electric energy meter can be controlled and adjusted in time when the internal temperature of the electric energy meter is high, avoiding safety accidents caused by the electric energy meter's over-high temperature but not being detected.

[0047] When the temperature of the electric energy meter is extremely low, the thermal conductivity and insulation performance of the insulation layer are good, the phase change material on the connecting convex plate will not change shape, and the pressure sensitive element will not feel the pressure change. The electric energy meter connection port and the insertion end plate are well engaged, which can quickly and accurately transfer the temperature and achieve the accuracy of temperature measurement. Then, the temperature compensation control of the electric energy meter is performed according to the temperature sensed by the thermistor. When the temperature is detected to be lower than the low temperature threshold T d When the internal temperature is not lower than the low temperature threshold and there is no pressure change, the control device controls the temperature balance module to increase the temperature of the electric energy meter. When the internal temperature is not lower than the low temperature threshold and there is no pressure change, the normal operation and control of the electric energy meter is carried out according to the detected internal temperature. To ensure the normal and stable operation of the electric energy meter.

[0048] When the temperature of the electric energy meter is moderate, it is necessary to properly operate the heat dissipation control method to prevent the internal temperature of the electric energy meter from continuing to rise, ensure that the pressure felt by the pressure-sensitive element does not change, and perform normal operation and control of the electric energy meter based on the measured temperature value.

[0049] Specifically, Figure 5 As shown, the temperature control method of the present invention comprises the following steps:

[0050] S100, obtaining the ambient temperature, specifically including:

[0051] S110, at ambient temperature T 环 When the ambient temperature is higher than the first ambient temperature threshold T1, the pressure on the pressure-sensitive element is detected;

[0052] S120, when the pressure on the pressure-sensitive element increases, it means that the internal temperature of the electric energy meter is higher than the high temperature threshold T h , starting the heat dissipation control method to dissipate heat inside the electric energy meter;

[0053] S130, the control system controls the pop-up module to pop up and push the insertion end plate in the reverse direction to pop up so that the insertion end plate is disconnected from the connection port, and an alarm prompt is issued at the same time.

[0054] In step S120, when the pressure sensitive element does not detect an increase in pressure, it indicates that the ambient temperature does not have an excessive impact on the internal temperature of the electric energy meter, and the thermistor of the detection device can obtain the internal temperature of the electric energy meter normally.

[0055] S200, at ambient temperature T 环 When the ambient temperature is lower than the second ambient temperature threshold T2, the pressure on the pressure-sensitive element is detected;

[0056] S210. When the pressure sensitive element does not detect a significant increase in pressure, it indicates that the insertion end plate and the connection port are well engaged. Meanwhile, when the pressure sensitive element detects a significant increase in pressure, execute step S130.

[0057] In step S210, due to the low ambient temperature, under normal circumstances, the electric energy meter will not generate excessively high temperatures when operating normally. Therefore, under this condition, when the pressure sensitive element detects a significant increase in pressure, it indicates that the internal operation of the electric energy meter is abnormal, and the connection between the detection equipment and the electric energy meter body needs to be disconnected to prevent misdetection and misjudgment.

[0058] S220, obtaining the internal temperature T detected by the thermistor;

[0059] S230, when the detected internal temperature data is lower than the low temperature threshold T d When the temperature balance module is started, the temperature of the electric energy meter is appropriately raised to ensure the normal operation of the electric energy meter; the temperature balance module is set to run for a set time to ensure that the electric energy meter is heated to a temperature that can operate normally while preventing excessive temperature compensation;

[0060] Further, in step S230, when the temperature balance module is running, the pressure sensitive element detects that the pressure increases and then promptly executes step S120 to dissipate heat inside the electric energy meter;

[0061] S240: When the internal temperature is detected to be not lower than the low temperature threshold T d When there is no pressure increase, the normal operation and control of the electric energy meter is carried out according to the detected internal temperature.

[0062] The first ambient temperature threshold T1 is a high temperature ambient threshold, the second ambient temperature threshold T2 is a low temperature ambient threshold, and T1>T2. Preferably, the first ambient temperature threshold T1 is set to 50-70°C, and the second ambient temperature threshold T2 is set to -25--15°C. More preferably, T1 is set to 65°C, and the second ambient temperature threshold T2 is set to -20°C.

[0063] S300, at ambient temperature T 环 When the temperature is between the first ambient temperature T1 and the second ambient temperature T2, the internal temperature value of the electric energy meter detected by the thermistor is obtained;

[0064] S310, when the internal temperature T of the electric energy meter is T h When -ΔT≤T, the heat dissipation control method is started to dissipate heat for the electric energy meter, and at the same time, the pressure change of the pressure-sensitive element is continuously detected.

[0065] Specifically, when the internal temperature of the energy meter is T h When it is within the range of -ΔT≤T, it means that the temperature value detected by the thermistor is close to the internal high temperature threshold. At this time, the thermal conductivity of the insulation layer may have dropped significantly, and the actual internal temperature of the electric energy meter may have exceeded the value detected by the thermistor. Therefore, it is necessary to start the heat dissipation control method to dissipate the heat inside the electric energy meter to prevent the internal temperature of the electric energy meter from continuing to rise.

[0066] When the pressure detected by the pressure-sensitive element increases, step S120 is executed.

[0067] Furthermore, T h -ΔT is set according to the thermal conductivity temperature curve. At this temperature point, the thermal conductivity decreases significantly, while the insulation performance decreases slightly.

[0068] S320, when the internal temperature T of the electric energy meter is T d +ΔT≤T≤T h When -ΔT, the heat dissipation is not started, and the normal operation and control of the electric energy meter are carried out according to the measured temperature value, but it is necessary to continue to pay attention to the temperature changes inside the electric energy meter and the pressure changes on the piezoresistive element.

[0069] S330, continuously obtaining the internal temperature of the electric energy meter sensed by the thermistor, and when the internal temperature of the electric energy meter drops to T d When the temperature is below +ΔT, the electric energy meter is operated and controlled normally according to the measured temperature value.

[0070] S340, when the internal temperature T of the electric energy meter is lower than T d When the error occurs, it indicates that the electric energy meter or the detection equipment is operating abnormally and needs to be inspected and repaired or an alarm is issued.

[0071] As part of this embodiment, the high temperature threshold T h Set to 60±5℃, low temperature threshold T d Set to -10±5℃, preferably, the high temperature threshold T h Set to 60℃, low temperature threshold T d Set to -10℃. Generally, when the internal temperature of the energy meter approaches the high temperature threshold T h Or greater than the high temperature threshold Th When the phase change material inserted at the end of the end plate is pressed, it is very likely to undergo a melting phase change, causing the pressure of the pressure-sensitive element to increase.

[0072] Furthermore, ΔT=(T h -T d ) / 3.

[0073] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. An electric energy meter, characterized in that: The invention comprises an electric energy meter body (2) and a detection device (1), wherein a connection port (21) is provided on the electric energy meter body (2), and the detection device (1) is detachably inserted into and connected with the connection port (21) to detect the internal temperature of the electric energy meter, wherein the connection port (21) is configured to be coupled and connected with a circuit board and / or a control element inside the electric energy meter, and the detection device (1) comprises a detection body (11) and an insertion end plate (12), wherein the detection body (11) and the insertion end plate (12) are both wrapped with an insulating layer (14) on the outside, and when the detection device (1) is connected to the connection port (21), the insertion end plate (12) is inserted into the inside of the connection port (21), and the temperature inside the connection port (21) is detected. A heat-conducting layer (16) and a thermistor (110) are also provided inside the detection body (11), the outer side of the thermistor (110) is wrapped by the heat-conducting layer (16) and the insulating layer (14), a connecting convex plate (23) is provided inside the connecting port (21), a pressure-sensitive element (15) is provided inside the insertion end plate (12), a phase-change material layer (24) is provided on the connecting convex plate (23), the outer side of the phase-change material layer (24) is wrapped by a film, when the phase-change material undergoes a phase change and melts, the film on the outer side of the phase-change material swells, generating pressure on the pressure-sensitive element (15), and the state of the electric energy meter is adjusted in time through the pressure change detected by the pressure-sensitive element (15).

2. The electric energy meter according to claim 1, characterized in that: The number of the inserted end plates (12) is two, and the two inserted end plates (12) are symmetrically arranged back to back.

3. The electric energy meter according to claim 1, characterized in that: A plurality of connection protrusions (23) are arranged inside the connection port (21), and the insertion end plate (12) is arranged to be at least a semi-wrapped structure; when the detection device (1) is connected to the connection port (21), the insertion end plate (12) wraps the connection protrusions (23) inside the connection port.

4. The electric energy meter according to claim 1, characterized in that: The phase change material is paraffin.

5. The electric energy meter according to claim 1, characterized in that: The material of the insulating layer (14) is set to be a polyimide resin added with fluorine-containing graphene, and the thermal conductivity of the insulating layer is 0.55 to 2.

4.

6. The electric energy meter according to claim 1, characterized in that: The electric energy meter also includes a control system, a heat dissipation device and a temperature balance module. The control system is electrically connected to the thermistor, the pressure-sensitive element, the heat dissipation device and the temperature balance module. The thermistor and the pressure-sensitive element transmit the detected results to the control system, and the control system controls the heat dissipation device and the temperature balance module to take corresponding actions according to the detected results.

7. The electric energy meter according to claim 6, characterized in that: A heat dissipation fan is arranged near the connection port (21), the heat dissipation fan is arranged at the lower part of the electric energy meter body (2), air outlets (26) are arranged on the left and right sides of the heat dissipation fan, and an air inlet (27) is arranged at the lower part of the heat dissipation fan.

8. The electric energy meter according to claim 6, characterized in that: The temperature balancing module comprises a heating device and a circulating heat exchange device, wherein the heating device is used to heat the heat exchange medium in the circulating heat exchange device, and the circulating heat exchange device transfers the heat of the heated heat exchange medium to the inside of the electric energy meter.

9. The electric energy meter according to claim 8, characterized in that: The circulating heat exchange device is configured as a membrane heat exchanger.

10. A method for controlling an electric energy meter, characterized in that: Using the electric energy meter according to any one of claims 1 to 9, when the ambient temperature is normal, the control method comprises the following steps: When the internal temperature of the energy meter is T h -ΔT ≤ At T, the heat dissipation control method is started to dissipate heat for the electric energy meter, and the pressure change of the pressure-sensitive element is continuously detected. When the pressure on the pressure-sensitive element changes, the heat dissipation control method is started to dissipate heat inside the electric energy meter; When the internal temperature of the energy meter is T d +ΔT ≤ T ≤ T h When -ΔT, the heat dissipation is not started, and the normal operation and control of the electric energy meter are carried out according to the detected internal temperature of the electric energy meter, but the temperature change inside the electric energy meter and the pressure change of the pressure-sensitive element need to be continuously paid attention to; When the internal temperature of the energy meter drops to T d ≤T ＜ T d +ΔT, the normal operation and control of the electric energy meter is carried out according to the measured temperature value; When the internal temperature T of the electric energy meter is lower than Td, it indicates that the electric energy meter is operating abnormally and needs to be inspected and repaired or an alarm is issued.

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