Novel ultrasonic water meter transducer

Abstract

The utility model relates to a water meter sensor, and aims to provide a novel ultrasonic water meter transducer which has the characteristics of low water leakage risk, convenience in production and low cost. According to the technical scheme, the novel ultrasonic water meter transducer comprises a shell; the impedance matching layer, the piezoelectric ceramic piece, the backing layer and the potting layer are sequentially arranged in an inner cavity of the shell from inside to outside; the first signal line is electrically connected with the piezoelectric ceramic piece; the temperature sensor is characterized in that a fixing groove is formed in the side face of the inner cavity, an isolation plate is arranged between the inner cavity and the fixing groove, the temperature sensor probe is fixed in the fixing groove and packaged by an encapsulation layer, and the second signal line is electrically connected with the temperature sensor probe.

Description

Technical Field

[0001] The utility model relates to a water meter sensor, in particular to a novel ultrasonic water meter transducer. Background Art

[0002] With the rapid development of smart water services in smart cities, the trend of water meter intelligence is getting higher and higher. As a new type of smart water meter, ultrasonic water meter has the characteristics of low starting flow, high measurement accuracy, wide range ratio, no moving parts, low pressure loss, stable measurement, etc., and has obvious advantages in smart water meters.

[0003] The ultrasonic water meter transmits water usage data information in real time. After receiving the data, the cloud platform automatically analyzes the periodic water usage of the pipe network, rationally controls the water supply pipe network system, saves water and electricity, and warns of abnormalities in the water supply pipe network system and residents' water usage, and takes corresponding preventive measures.

[0004] As the key sensor of ultrasonic water meter, transducer is a component that interchanges mechanical energy and electrical energy. Its stability will affect the service life of the entire ultrasonic water meter. Temperature sensor probe, as an additional sensor of ultrasonic water meter, is used to detect the water temperature in the pipe. It can not only monitor the temperature of water supply network and take cold wave prevention measures in advance, but also combine the relevant matching algorithm of water temperature and transducer to effectively improve the accuracy and stability of ultrasonic water meter measurement.

[0005] At present, the transducer and temperature sensor probe of ultrasonic water meter adopt separate installation design. On the one hand, more holes need to be opened on the pipeline to meet the separate installation of transducer and temperature sensor probe, which increases the risk of pipeline leakage; on the other hand, transducer and temperature sensor probe need to be produced, manufactured and installed separately, which also increases the cost to a certain extent. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies in the above-mentioned background technology and provide a novel ultrasonic water meter transducer, which should have the characteristics of low water leakage risk, convenient production and low cost.

[0007] The technical solution of the utility model is:

[0008] A novel ultrasonic water meter transducer comprises a shell; an impedance matching layer, a piezoelectric ceramic sheet, a backing layer and a potting layer are sequentially arranged in an inner cavity of the shell from the inside to the outside; a first signal line is electrically connected to the piezoelectric ceramic sheet; and the invention is characterized in that a fixing groove is provided on the side of the inner cavity, an isolation plate is provided between the inner cavity and the fixing groove, a temperature sensor probe is fixed in the fixing groove and encapsulated by the potting layer, and a second signal line is electrically connected to the temperature sensor probe.

[0009] The temperature sensor probe is separated from the impedance matching layer, the piezoelectric ceramic sheet and the backing layer by an isolation plate.

[0010] The lower part of the inner cavity is separated from the lower part of the fixing groove by an isolation plate; the upper part of the inner cavity is communicated with the upper part of the fixing groove.

[0011] The depth of the inner cavity is the same as the depth of the fixing groove; the depth of the inner cavity is greater than the height of the isolation plate.

[0012] The encapsulation layer is filled in the inner cavity and the fixing groove.

[0013] The first signal line passes through the encapsulation layer and the backing layer and then is electrically connected to the piezoelectric ceramic sheet.

[0014] The second signal line passes through the encapsulation layer and is electrically connected to the temperature sensor probe.

[0015] The temperature sensor probe is an NTC temperature sensor probe.

[0016] The beneficial effects of the utility model are:

[0017] In order to solve the risk of water leakage caused by the separate design of the existing transducer and temperature sensor probe, as well as the shortcomings caused by separate production, manufacturing and installation, the utility model proposes a new ultrasonic water meter transducer. The transducer has a built-in temperature sensor probe, realizing the integrated design of the transducer and the temperature sensor probe. Therefore, there is no need to reserve additional holes on the pipeline to install the temperature sensor probe, which can effectively reduce the risk of water leakage in the pipeline and save production costs, manufacturing costs and installation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0019] Figure 2 It is a main structural schematic diagram of the utility model.

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the shell of the utility model.

[0021] Figure 4 It is a schematic diagram of the top view of the shell of the utility model.

[0022] Figure 5 It is one of the cross-sectional structural schematic diagrams of the utility model.

[0023] Figure 6 This is the second schematic cross-sectional view of the utility model.

[0024] Reference numerals:

[0025] Shell 1, upper shell 1-1, lower shell 1-2, inner cavity 1.1, fixing groove 1.2, isolation plate 1.3, impedance matching layer 2, piezoelectric ceramic sheet 3, backing layer 4, potting layer 5, first signal line 6, temperature sensor probe 7, second signal line 8. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] like Figure 1 As shown, a novel ultrasonic water meter transducer includes a housing 1, an impedance matching layer 2, a piezoelectric ceramic sheet 3, a backing layer 4, a potting layer 5, a first signal line 6, a temperature sensor probe 7, and a second signal line 8.

[0028] The housing is a convex housing, comprising an upper housing 1-1 and a lower housing 1-2, the top surface of the upper housing is open, and the bottom surface of the lower housing is closed. The impedance matching layer, piezoelectric ceramic sheet, backing layer, and potting layer are arranged in the inner cavity 1.1 of the housing.

[0029] like Figure 5 As shown, the impedance matching layer, the piezoelectric ceramic sheet, the backing layer, and the encapsulation layer are sequentially arranged in the inner cavity from the inside to the outside (from bottom to top), and the first signal line passes through the encapsulation layer and the backing layer and then electrically connects to the piezoelectric ceramic sheet.

[0030] like Figure 3 As shown, the housing is also provided with a fixing groove 1.2. The fixing groove is formed on the side wall of the inner cavity, and the depth of the inner cavity ( Figure 3 The length in the vertical direction of the inner cavity is the same as the depth of the fixing groove, and the bottom surface of the inner cavity is flush with the bottom surface of the fixing groove.

[0031] like Figure 3 As shown, an isolation plate 1.3 is provided between the inner cavity and the fixing groove. The isolation plate extends upward from the bottom surface of the fixing groove, the depth of the inner cavity is greater than the height of the isolation plate, and the top surface of the isolation plate is lower than the top surface of the shell, so the isolation plate completely separates the lower part of the inner cavity from the lower part of the fixing groove, while the upper part of the inner cavity remains connected to the upper part of the fixing groove.

[0032] like Figure 5 As shown, the temperature sensor probe is arranged in the fixing groove and encapsulated by the potting layer. The temperature sensor probe is fixed at the bottom of the fixing groove, and the top of the temperature sensor probe is filled with the potting layer. The second signal line passes through the potting layer and is electrically connected to the temperature sensor probe. The temperature sensor probe is an NTC temperature sensor probe.

[0033] like Figure 5As shown, the impedance matching layer, the piezoelectric ceramic sheet, and the backing layer are arranged on the left side of the isolation plate, the top surface of the backing layer is flush with or lower than the top surface of the isolation plate, and the temperature sensor probe is arranged on the right side of the isolation plate, and the temperature sensor probe is separated from the impedance matching layer, the piezoelectric ceramic sheet, and the backing layer by the isolation plate.

[0034] The first signal line is used to transmit the electrical signal of the piezoelectric ceramic chip. The first signal line has two cores.

[0035] The second signal line is used to transmit the electrical signal of the temperature sensor probe. The second signal line is a two-core line.

[0036] The potting layer uses a potting material (preferably AB glue) to isolate the internal sensitive elements of the transducer (piezoelectric ceramic sheet, temperature sensor probe) from external water vapor to achieve IP68 waterproof effect.

[0037] The housing is made of plastic (preferably PPS) and is used to fix the sensitive elements inside the transducer.

[0038] The temperature sensor probe is an NTC temperature sensor probe, and the temperature sensor probe and the piezoelectric ceramic sheet are integrally potted.

[0039] The backing layer is used to control the frequency and pulse response of the ultrasonic transducer, and the resonance process of the piezoelectric ceramic sheet is quickly reduced by utilizing the damping effect of the backing layer.

[0040] The piezoelectric ceramic sheet is used as a sensitive element for converting mechanical energy and electrical energy signals, for transmitting and receiving ultrasonic signals, and converting them into corresponding energy signals.

[0041] The impedance matching layer is used to reduce the reflection of signals caused by the large difference in acoustic impedance when sound waves propagate in two different media, thereby ensuring that the ultrasonic waves generated by the transducer can smoothly enter the water.

[0042] The utility model adopts two outlet modes:

[0043] 1. Merge outgoing line

[0044] like Figure 5 As shown, one end of the first signal line is electrically connected to the piezoelectric ceramic sheet, and the other end extends upward from the potting layer; one end of the second signal line is electrically connected to the temperature sensor probe, and the other end bypasses the isolation plate and extends to the left (towards the center of the inner cavity), and then merges with the first signal line and extends upward from the potting layer.

[0045] 2. Separate the outlet

[0046] like Figure 6As shown, one end of the first signal line is electrically connected to the piezoelectric ceramic sheet, and the other end extends upward and out of the potting layer; one end of the second signal line is electrically connected to the temperature sensor probe, and the other end extends upward and out of the potting layer.

[0047] The working principle of the utility model is:

[0048] It is only necessary to open a transducer fixing hole on the pipe wall, install the upper shell of the transducer in the fixing hole of the pipe wall, and extend the lower shell of the transducer into the pipe. The piezoelectric ceramic generates sound waves when receiving electrical signals, which are transmitted into the measured medium through the bottom surface of the shell. After reflection, the sound waves are transmitted to the piezoelectric ceramics through the bottom surface of the shell. The piezoelectric ceramics generate electrical signals when vibrated by the sound waves, which are transmitted to the signal processing system through the first signal line. The water temperature is transmitted to the temperature sensor probe through the bottom surface of the shell. The temperature measurement system collects the information of the temperature sensor probe through the second signal line, and realizes the water temperature measurement after calculation.

[0049] The preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

Claims

1. A novel ultrasonic water meter transducer, comprising a housing (1); an impedance matching layer (2), a piezoelectric ceramic sheet (3), a backing layer (4) and a potting layer (5) are sequentially arranged in an inner cavity (1.1) of the housing from the inside to the outside; a first signal line (6) is electrically connected to the piezoelectric ceramic sheet; and the characteristics are: A fixing groove (1.2) is provided on the side of the inner cavity, an isolation plate (1.3) is provided between the inner cavity and the fixing groove, a temperature sensor probe (7) is fixed in the fixing groove and encapsulated by a potting layer, and a second signal line (8) is electrically connected to the temperature sensor probe.

2. The novel ultrasonic water meter transducer according to claim 1 is characterized in that: The temperature sensor probe is separated from the impedance matching layer, the piezoelectric ceramic sheet and the backing layer by an isolation plate.

3. The novel ultrasonic water meter transducer according to claim 2 is characterized in that: The lower part of the inner cavity is separated from the lower part of the fixing groove by an isolation plate; the upper part of the inner cavity is communicated with the upper part of the fixing groove.

4. The novel ultrasonic water meter transducer according to claim 3 is characterized in that: The depth of the inner cavity is the same as the depth of the fixing groove; the depth of the inner cavity is greater than the height of the isolation plate.

5. The novel ultrasonic water meter transducer according to claim 4 is characterized in that: The encapsulation layer is filled in the inner cavity and the fixing groove.

6. The novel ultrasonic water meter transducer according to claim 5 is characterized in that: The first signal line passes through the encapsulation layer and the backing layer and then is electrically connected to the piezoelectric ceramic sheet.

7. The novel ultrasonic water meter transducer according to claim 6 is characterized in that: The second signal line passes through the encapsulation layer and is electrically connected to the temperature sensor probe.

8. The novel ultrasonic water meter transducer according to claim 7 is characterized in that: The temperature sensor probe is an NTC temperature sensor probe.

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