High-precision sensor for detecting pipeline leakage

Abstract

The utility model discloses a high-precision sensor for detecting pipeline leakage, which comprises a shell, a shell cover and a shell body, the shell cover and the shell body are hermetically connected, and the shell body is provided with a vacuum interlayer; the signal acquisition mechanism is fixedly connected to the interior of the shell; the temperature control mechanism is arranged between the signal acquisition mechanism and the shell cover; the temperature control mechanism comprises a movable heat-conducting fin, a first heat-conducting fin fixedly connected to the shell cover and a second heat-conducting fin fixedly connected to the signal acquisition mechanism, the first heat-conducting fin and the second heat-conducting fin are oppositely arranged at an interval, and the movable heat-conducting fin is provided with power by the power unit and is movably arranged in the shell. The shell is used for protecting the signal acquisition mechanism, and the temperature control mechanism is used for adjusting the temperature of the signal acquisition mechanism, so that the signal acquisition mechanism can work at a proper temperature, and the detection precision of the sensor is improved; the arrangement of the central control interlayer can reduce heat exchange inside and outside the housing, improve the precision of temperature control inside the housing, and further improve the detection precision of the sensor.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, and in particular relates to a high-precision sensor for detecting pipeline leaks. Background Technology

[0002] When a pipe leaks, water sprays or seeps out from the damaged area, interacting with the pipe and surrounding medium, generating friction and impact, thus producing vibration signals. These vibration signals propagate along the pipe and surrounding soil, buildings, and other media. Therefore, sensors can be used to detect these vibration signals, and the received signals can be analyzed to detect pipe leaks.

[0003] When inspecting pipelines laid outdoors, the sensors installed also need to be used outdoors. Due to the large temperature fluctuations outdoors, the performance of the sensors may be unstable. Under extremely cold or hot conditions, the accuracy of the sensors may decrease, or they may even malfunction.

[0004] Therefore, it is necessary to improve the sensors in the existing technology. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide a high-precision sensor for detecting pipeline leaks, thereby improving the accuracy of the sensor in detecting pipeline leaks.

[0006] To achieve the above objectives, the specific technical solution of the high-precision sensor for detecting pipeline leaks of this utility model is as follows:

[0007] A high-precision sensor for detecting pipeline leaks includes:

[0008] The outer casing includes a sealed-connection cover and a housing, the housing having a vacuum interlayer;

[0009] A signal acquisition mechanism is fixedly connected inside the housing and is used to detect vibration signals;

[0010] A temperature control mechanism is disposed between the signal acquisition mechanism and the housing cover, and is used to adjust the temperature of the signal acquisition mechanism;

[0011] The temperature control mechanism includes a movable heat-conducting plate, a first heat-conducting plate fixedly connected to the shell cover, and a second heat-conducting plate fixedly connected to the signal acquisition mechanism. The first heat-conducting plate and the second heat-conducting plate are arranged opposite to each other and are spaced apart. The movable heat-conducting plate is powered by a power unit and is movable inside the shell.

[0012] Preferably, the signal acquisition mechanism includes a ceramic base and a shield that are fixedly connected to each other. The ceramic base and the shield form a sealed space for accommodating the circuit board. A piezoelectric ceramic is fixedly connected to the ceramic base, and a mass block is fixedly connected to the piezoelectric ceramic.

[0013] Preferably, the circuit board is provided with:

[0014] A signal acquisition circuit, the input of which is connected to the piezoelectric ceramic, is used to receive the electrical signal generated by the piezoelectric ceramic.

[0015] An amplifier circuit is connected to the output terminal of the signal acquisition circuit and is used to amplify the electrical signal output by the signal acquisition circuit.

[0016] The emitter follower circuit has its input terminal connected to the output terminal of the signal acquisition circuit, which serves to stabilize and buffer the output signal.

[0017] The power supply circuit is electrically connected to the signal acquisition circuit, the amplifier circuit, and the emitter follower circuit, and is used to supply power to the circuit.

[0018] Preferably, a rigid sealing filler is provided between the housing and the signal acquisition mechanism, the signal acquisition mechanism is embedded inside the sealing filler, and the second heat-conducting sheet extends to the outside of the sealing filler.

[0019] Preferably, the shielding cover has a wire hole, a sealing plug is provided at the wire hole, the cover is provided with a wire tube communicating with the outside of the outer shell, and a cable is sealed and connected to the end of the wire tube.

[0020] Preferably, the conduit is provided with a bearing, the inner ring of the bearing is fixedly connected to the outer circumferential surface of the conduit, and the movable heat-conducting plate is fixedly connected to the outer ring of the bearing.

[0021] Preferably, the power unit includes a thermal expansion member fixedly connected to the housing cover, and the movable end of the thermal expansion member is connected to the movable heat-conducting plate.

[0022] Preferably, the inner wall of the shell is covered with a heat insulation layer, the thickness of which is less than the height of the second heat-conducting sheet.

[0023] The high-precision sensor for detecting pipeline leaks of this utility model has the following advantages: the outer shell protects the signal acquisition mechanism, and the temperature control mechanism is set to adjust the temperature of the signal acquisition mechanism so that the signal acquisition mechanism can work at a suitable temperature, thereby improving the detection accuracy of the sensor; the central control interlayer can reduce heat exchange between the inside and outside of the outer shell, improve the accuracy of temperature control inside the outer shell, and further improve the detection accuracy of the sensor. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the sensor structure of this utility model;

[0025] Figure 2 This is a cross-sectional view of the sensor of this utility model;

[0026] Figure 3 This is a schematic diagram of the connection structure between the shell cover and the temperature control mechanism of this utility model;

[0027] Figure 4 This is a schematic diagram of the signal acquisition mechanism of this utility model;

[0028] Figure 5 This is a cross-sectional view of the signal acquisition mechanism of this utility model;

[0029] Figure 6 This is a schematic diagram of the circuit structure of the circuit board of this utility model;

[0030] The markings in the diagram are as follows: 1. Outer shell; 2. Signal acquisition mechanism; 3. Temperature control mechanism; 4. Sealing filling part; 101. Cable; 102. Shell cover; 103. Shell; 104. Heat insulation layer; 105. Vacuum interlayer; 201. Shielding cover; 202. Ceramic base; 203. Mass block; 204. Piezoelectric ceramic; 205. Circuit board; 206. Sealing plug; 301. First heat-conducting plate; 302. Thermal expansion component; 303. Movable heat-conducting plate; 304. Second heat-conducting plate; 2051. Power supply circuit; 2052. Amplifier circuit; 2053. Emitter follower circuit; 2054. Signal acquisition circuit. Detailed Implementation

[0031] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0032] The terms "top surface," "bottom surface," and "full surface" are used with reference to the normal operating state of the sensor and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model.

[0033] like Figure 1-5As shown, a high-precision sensor for detecting pipeline leaks includes: a housing 1, comprising a sealed housing cover 102 and a housing 103, the housing 103 having a vacuum interlayer 105; a signal acquisition mechanism 2, fixedly connected inside the housing 103, for detecting vibration signals; and a temperature control mechanism 3, disposed between the signal acquisition mechanism 2 and the housing cover 102, for adjusting the temperature of the signal acquisition mechanism 2. The temperature control mechanism 3 includes a movable heat-conducting plate 303, a first heat-conducting plate 301 fixedly connected to the housing cover 102, and a second heat-conducting plate 304 fixedly connected to the signal acquisition mechanism 2. The first heat-conducting plate 301 and the second heat-conducting plate 304 are arranged opposite to each other and spaced apart. The movable heat-conducting plate 303 is powered by a power unit and is movable inside the housing 103.

[0034] The aforementioned sensor is suitable for detecting leaks in outdoor pipes. It is typically installed at locations where leaks are likely to occur, such as where two pipe sections meet. The sensor's housing 1 is made of stainless steel. After the signal acquisition mechanism 2 is fixed inside, the housing 103 and the cover 102 can be welded together to enhance the housing's robustness and protective effect. The signal acquisition mechanism 2 receives vibration signals from the water flow in the pipe. When a leak occurs, the vibration signal received by the signal acquisition mechanism 2 will change. Therefore, by analyzing the vibration signal received by the signal acquisition mechanism 2, a leak can be determined. The temperature control mechanism 3 regulates the internal temperature of the housing 1, ensuring the signal acquisition mechanism 2 operates within a suitable temperature range, thereby improving the accuracy of the signal acquisition. The specific operation of the temperature control mechanism 3 is as follows: When the internal temperature of the housing is too high, the power unit pushes the movable heat-conducting plate 303 closer to the first heat-conducting plate 301 and the second heat-conducting plate 304, ensuring that the movable heat-conducting plate 303 is tightly fitted with both the first and second heat-conducting plates 301 and 304, forming a heat conduction path. Heat from the signal acquisition mechanism 2 is conducted to the housing cover 102, and then dissipated into the air through the housing cover 102, thereby cooling the signal acquisition mechanism 2. When the internal temperature of the housing is too low, the power unit pushes the movable heat-conducting plate 303 away from the first heat-conducting plate 301 and the second heat-conducting plate 304, separating them from each other. At this time, the first heat-conducting plate 301 and the second heat-conducting plate 304 are kept apart, and the heat conduction path is cut off, thereby reducing the rate of heat dissipation from the signal acquisition mechanism 2, so that the temperature of the signal acquisition mechanism 2 can rise. This achieves the cooling of the signal acquisition mechanism 2. The temperature adjustment of the signal acquisition mechanism 2 improves the accuracy of signal acquisition and the detection accuracy of the sensor. The inner wall of the shell 102 is covered with a heat insulation layer 104, the thickness of which is less than the height of the second heat-conducting sheet 304. The heat insulation layer 104 is an aerogel layer. Through the setting of the heat insulation layer and the vacuum interlayer 105, the heat exchange between the inside and outside of the shell 1 can be isolated, thereby reducing the influence of the external ambient temperature on the internal temperature of the shell 1, improving the effect of the temperature control mechanism 3 in regulating the internal temperature of the shell 1, and further improving the detection accuracy of the sensor.

[0035] Further improvements include, for example Figure 4 and 5As shown, the signal acquisition mechanism 2 includes a ceramic base 202 and a shielding cover 201 fixedly connected to each other. The ceramic base 202 and the shielding cover 201 enclose a sealed space for accommodating the circuit board 205. A piezoelectric ceramic 204 is fixedly connected to the ceramic base 202, and a mass block 203 is fixedly connected to the piezoelectric ceramic 204. In this sensor, the ceramic base 202 has a columnar structure, the piezoelectric ceramic 204 is a ring structure fitted on the outer periphery of the columnar structure, and the mass block 203 is a ring structure fitted on the outer periphery of the piezoelectric ceramic 204. The mass block 203, the ceramic base 202, and the piezoelectric ceramic 204 are fixed together with conductive adhesive. A wire is led out from the ceramic base 202 as the negative input terminal of the circuit board 205, and a wire is led out from the mass block 203 as the positive input terminal of the circuit board 205. The shielding cover 201 is made of stainless steel and is used to protect the piezoelectric ceramic 204 and the circuit board 205 inside.

[0036] Further improvements include, for example Figure 6 As shown, the circuit board 205 includes: a signal acquisition circuit 2054, whose input terminal is connected to the piezoelectric ceramic 204 for receiving the electrical signal generated by the piezoelectric ceramic 204; an amplifier circuit 2052, connected to the output terminal of the signal acquisition circuit 2054 for amplifying the electrical signal output by the signal acquisition circuit 2054; an emitter follower circuit 2053, whose input terminal is connected to the output terminal of the signal acquisition circuit 2054 for stabilizing and buffering the output signal; and a power supply circuit 2051, which is electrically connected to the signal acquisition circuit 2054, the amplifier circuit 2052, and the emitter follower circuit 2053 for supplying power to the circuit.

[0037] In the aforementioned circuit board 205, the signal acquisition circuit 2054 includes a capacitor C1 and a resistor R2. A mass block 203 is connected to one end of capacitor C1, and the other end of capacitor C1 is connected to one end of resistor R2. The amplifier circuit 2052 includes a capacitor C2 and a resistor R1. One end of capacitor C2 and one end of resistor R1 are both connected to the other end of resistor R2. The power supply circuit 2051 includes a capacitor C4, a resistor R3, a resistor R4, and a power supply. The positive terminal of the power supply is connected to one end of capacitor C4, one end of resistor R3, and the other end of capacitor C2. The negative terminal of the power supply and the capacitor... The other end of C4, one end of resistor R4, and ceramic base 202 are all grounded. The other end of resistor R3 is connected to the other end of resistor R1 and the other end of resistor R4. The emitter follower circuit 2053 includes a field-effect transistor Q1 and a transistor Q2. The gate of field-effect transistor Q1 is connected to the other end of resistor R2. The source of field-effect transistor Q1 and the collector of transistor Q2 are grounded. The base and emitter of transistor Q2 and the drain of field-effect transistor Q1 are all connected to the positive terminal of the power supply. In the above circuit structure, the power supply can be a battery or connected to an external power supply via a cable.

[0038] Further improvements include, for example Figure 4 and5 As shown, a rigid sealing filler 4 is provided between the housing 103 and the signal acquisition mechanism 2. The signal acquisition mechanism 2 is embedded inside the sealing filler 4, and the second heat-conducting sheet 304 extends to the outside of the sealing filler 4. The sealing filler 4 is made of epoxy resin. During installation, the signal acquisition mechanism 2 is placed inside the housing 103 and positioned. Then, epoxy resin is poured into the housing 103 until it overflows the signal acquisition mechanism 2 but does not exceed the second heat-conducting sheet 304. After the epoxy resin cures, the housing cover 102 is put on and welded. This improves the protection performance of the signal acquisition mechanism 2 and extends the service life of the sensor.

[0039] Further improvements include, for example Figure 2-5 As shown, the shielding cover 201 has a wire-passing hole, and a sealing plug 206 is sealed at the wire-passing hole. The housing cover 102 has a wire-passing tube connecting to the outside of the housing 1, and a cable 101 is sealed to the end of the wire-passing tube. Signal lines are led out from the circuit board 205, passing through the wire-passing hole and the wire-passing tube in sequence. The power line supplying power to the circuit board 205 can also pass through the wire-passing hole and the wire-passing tube. A waterproof connector is sealed and connected to the housing cover 102, connecting the waterproof connector to the signal line and the power line. Then, the cable 101 is connected to the waterproof connector, transmitting signals and supplying power to the sensor through the cable 101. The sealing plug 206 can seal the shielding cover 201, improving the protection effect.

[0040] Further improvements include, for example Figure 3As shown, the conduit is equipped with a bearing, the inner ring of which is fixedly connected to the outer circumferential surface of the conduit, and the movable heat-conducting plate 303 is fixedly connected to the outer ring of the bearing; the power unit includes a thermal expansion member 302 fixedly connected to the housing cover 102, and the movable end of the thermal expansion member 302 is connected to the movable heat-conducting plate 303. Multiple sets of first heat-conducting plates 301 and second heat-conducting plates 304 can be arranged radially along the conduit, and each set of heat-conducting plates is evenly spaced around the axis of the conduit; the number of movable heat-conducting plates 303 is the same as the number of first heat-conducting plates 301 and corresponds one-to-one, the movable heat-conducting plates 303 are arranged radially along the conduit, and each movable heat-conducting plate 303 is evenly spaced around the axis of the conduit; the thermal expansion member 302 is a bimetallic strip, which is made of two metal sheets with different coefficients of thermal expansion bonded together. When the temperature changes, the bimetallic strip will bend due to the different expansion degrees of the two metals; when the inside of the housing 1... When the temperature rises, the bimetallic strip bends, pushing the movable heat-conducting plate 303 to come into close contact with the first heat-conducting plate 301 and the second heat-conducting plate 304, forming a heat conduction path between the shield 201 and the shell cover 102, allowing the heat inside the shield 201 to dissipate quickly and achieve cooling. When the temperature inside the shell 1 decreases, the bimetallic strip returns to its original position, pulling the movable heat-conducting plate 303 to separate from the first heat-conducting plate 301 and the second heat-conducting plate 304, breaking the heat conduction path, thereby slowing down the rate of heat dissipation inside the shield 201 and achieving heating. Ultimately, this achieves control over the temperature inside the shield 201 and improves the detection accuracy of the sensor.

[0041] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A high-precision sensor for detecting pipeline leaks, characterized in that, include: The outer casing (1) includes a sealed-connected cover (102) and a housing (103), the housing (103) having a vacuum interlayer (105). The signal acquisition mechanism (2) is fixedly connected inside the housing (103) and is used to detect vibration signals; A temperature control mechanism (3) is disposed between the signal acquisition mechanism (2) and the cover (102) for adjusting the temperature of the signal acquisition mechanism (2); The temperature control mechanism (3) includes a movable heat-conducting plate (303), a first heat-conducting plate (301) fixedly connected to the shell cover (102), and a second heat-conducting plate (304) fixedly connected to the signal acquisition mechanism (2). The first heat-conducting plate (301) and the second heat-conducting plate (304) are arranged opposite to each other and have a gap. The movable heat-conducting plate (303) is powered by a power unit and is movable inside the shell (103).

2. The high-precision sensor for detecting pipeline leaks according to claim 1, characterized in that, The signal acquisition mechanism (2) includes a ceramic base (202) and a shield (201) that are fixedly connected to each other. The ceramic base (202) and the shield (201) enclose a sealed space for accommodating a circuit board (205). The ceramic base (202) is fixedly connected to a piezoelectric ceramic (204), and the piezoelectric ceramic (204) is fixedly connected to a mass block (203).

3. The high-precision sensor for detecting pipeline leaks according to claim 2, characterized in that, The circuit board (205) is provided with: The signal acquisition circuit (2054) has its input terminal connected to the piezoelectric ceramic (204) and is used to receive the electrical signal generated by the piezoelectric ceramic (204); An amplifier circuit (2052) is connected to the output terminal of the signal acquisition circuit (2054) and is used to amplify the electrical signal output by the signal acquisition circuit (2054). The emitter follower circuit (2053) has its input terminal connected to the output terminal of the signal acquisition circuit (2054), which serves to stabilize and buffer the output signal. The power supply circuit (2051) is electrically connected to the signal acquisition circuit (2054), the amplifier circuit (2052), and the emitter follower circuit (2053) and is used to supply power to the circuit.

4. The high-precision sensor for detecting pipeline leaks according to claim 1, characterized in that, A rigid sealing filler (4) is provided between the housing (103) and the signal acquisition mechanism (2), the signal acquisition mechanism (2) is embedded inside the sealing filler (4), and the second heat-conducting sheet (304) extends to the outside of the sealing filler (4).

5. The high-precision sensor for detecting pipeline leaks according to claim 2, characterized in that, The shield (201) has a wire hole, and a sealing plug (206) is provided at the wire hole. The cover (102) is provided with a wire tube that connects to the outside of the outer shell (1), and a cable (101) is sealed at the end of the wire tube.

6. The high-precision sensor for detecting pipeline leaks according to claim 5, characterized in that, The conduit is equipped with a bearing, the inner ring of the bearing is fixedly connected to the outer circumferential surface of the conduit, and the movable heat-conducting plate (303) is fixedly connected to the outer ring of the bearing.

7. The high-precision sensor for detecting pipeline leaks according to claim 6, characterized in that, The power unit includes a thermal expansion member (302) fixedly connected to the shell cover (102), and the movable end of the thermal expansion member (302) is connected to the movable heat-conducting plate (303).

8. The high-precision sensor for detecting pipeline leaks according to claim 1, characterized in that, The inner wall of the shell cover (102) is covered with a heat insulation layer (104), the thickness of which is less than the height of the second heat-conducting sheet (304).

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