Temperature detection device

Abstract

The invention discloses a temperature detection device. The temperature detection device comprises a shell, piezoelectric ceramics, a reflector and a control circuit board, wherein the piezoelectric ceramics, the reflector and the control circuit board are arranged in the shell. According to the invention, the ultrasonic waves are transmitted and received through the piezoelectric ceramics, the temperature of the gas or liquid medium is obtained according to the propagation speed of the ultrasonic waves in the gas or liquid medium, and the propagation speed of the ultrasonic waves is high, so that the temperature of the gas or liquid medium can be rapidly detected. In addition, in the working process, the piezoelectric ceramic is not in direct contact with the gas or liquid medium to be detected, so that the piezoelectric ceramic is not polluted by the gas or liquid medium.

Description

Technical Field

[0001] This invention relates to the fields of temperature detection and ultrasonic application technology, and more specifically, to a temperature detection device. Background Technology

[0002] In existing technologies, temperature detection is typically performed using thermistors or thermocouples. However, thermistors and thermocouples have relatively long temperature detection response times. Furthermore, thermistors and thermocouples require direct contact with the object being detected, making them susceptible to contamination when used to detect gaseous or liquid media. Summary of the Invention

[0003] The starting point of this invention is to provide a temperature detection device, thereby solving the above-mentioned problems existing in the prior art.

[0004] Embodiments of the present invention provide a temperature detection device, which includes a housing and a piezoelectric ceramic, a reflector, and a control circuit board disposed within the housing. The piezoelectric ceramic is electrically connected to the control circuit board. A hollow tubular portion, closed at both ends, is formed in the housing. The piezoelectric ceramic is disposed on the outer surface of one closed end face of the tubular portion. The reflector is configured to extend inward from the side wall of the tubular portion, and an opening is provided on the side wall of the tubular portion.

[0005] After the gas or liquid medium to be detected is filled into the tubular portion through the opening, the temperature detection device detects the temperature of the gas or liquid medium in the following manner:

[0006] The control circuit board controls the piezoelectric ceramic to emit ultrasonic waves into the tubular portion;

[0007] The piezoelectric ceramic receives ultrasonic waves reflected by the reflector, converts the received ultrasonic waves into electrical signals, and transmits the electrical signals to the control circuit board; and...

[0008] The control circuit board obtains the time information of receiving ultrasonic waves based on the received electrical signal, and obtains the propagation speed of ultrasonic waves in the gas or liquid medium based on the time information of transmitting ultrasonic waves, the time information of receiving ultrasonic waves, and the distance between the piezoelectric ceramic and the reflector, thereby obtaining the temperature of the gas or liquid medium.

[0009] Optionally, the side of the piezoelectric ceramic facing the tubular portion is connected to the annular pin of the control circuit board via conductive adhesive.

[0010] Optionally, the side of the piezoelectric ceramic facing away from the tubular portion is connected to the pins of the control circuit board via a metal connecting bridge.

[0011] Optionally, the metal connecting bridge is provided with a groove, and the piezoelectric ceramic is disposed in the groove.

[0012] Optionally, a mounting hole is provided on the side wall of the tubular portion, and the reflector is fastened in the mounting hole.

[0013] Optionally, the ultrasonic reflecting surface of the reflector is parallel to the closed end face of the tubular portion.

[0014] Optionally, one or more openings are provided on the sidewall of the tubular portion.

[0015] Optionally, the housing is integrally injection molded.

[0016] The temperature detection device of the present invention has at least the following advantages:

[0017] In this invention, piezoelectric ceramics emit and receive ultrasonic waves, and the temperature of the gas or liquid medium is obtained based on the propagation speed of the ultrasonic waves in the gas or liquid medium. Because ultrasonic waves propagate very quickly, rapid detection of the temperature of the gas or liquid medium can be achieved. Furthermore, during operation, the piezoelectric ceramics do not come into direct contact with the gas or liquid medium being tested, thus preventing contamination by the gas or liquid medium.

[0018] In this invention, one side of the piezoelectric ceramic is connected to the annular pin of the control circuit board via conductive adhesive, and the other side of the piezoelectric ceramic is connected to the pin of the control circuit board via a metal connecting bridge, thereby realizing the electrical connection between the piezoelectric ceramic and the control circuit board.

[0019] In this invention, the piezoelectric ceramic is placed in the groove of the metal connecting bridge, thereby achieving reliable positioning of the piezoelectric ceramic.

[0020] In this invention, the reflector is secured in the mounting hole on the side wall of the tubular part, thereby achieving reliable positioning of the reflector.

[0021] In this invention, the ultrasonic reflecting surface of the reflector is parallel to the closed end face of the tubular part, which is beneficial for reflecting ultrasonic waves. Attached Figure Description

[0022] Other details and advantages of the invention will become apparent from the detailed description provided below. It should be understood that the following drawings are merely schematic and not drawn to scale, and therefore should not be considered as limiting the scope of this application. The following detailed description will refer to the drawings, in which:

[0023] Figure 1 A perspective view of a temperature detection device according to a specific embodiment of the present invention is shown.

[0024] Figure 2A front cross-sectional view of a temperature detection device according to a specific embodiment of the present invention is shown.

[0025] Figure 3 A top cross-sectional view of a temperature detection device according to a specific embodiment of the present invention is shown, in which a control circuit board is shown.

[0026] Figure 4 A top cross-sectional view of a temperature detection device according to a specific embodiment of the present invention is shown, wherein the control circuit board is not shown.

[0027] Figure 5 A perspective view of the control circuit board of a temperature detection device according to a specific embodiment of the present invention is shown. Detailed Implementation

[0028] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth to enable those skilled in the art to more fully understand and implement the invention. However, it will be apparent to those skilled in the art that implementation of the invention may not include some of these specific details. Furthermore, it should be understood that the invention is not limited to the specific embodiments described. Rather, the invention can be conceived to be practiced with any combination of the features and elements described below, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are illustrative only and should not be construed as elements or limitations of the claims unless expressly set forth in the claims.

[0029] According to the kinetic theory of molecules, the higher the temperature of a gas or liquid medium, the faster the particle velocity, the faster the change in compression and rarefaction occurs, and the faster vibrations (such as ultrasound) propagate within the medium. Therefore, the higher the temperature of a gas or liquid medium, the faster the molecular vibration speed, and the faster sound waves propagate. In liquids, the speed of ultrasound increases by approximately 1.5 meters per second for every 1°C increase in temperature. In air, the speed of ultrasound increases by approximately 0.6 meters per second for every 1°C increase in temperature.

[0030] Based on the above principle, in this invention, the control circuit board controls the piezoelectric ceramic to emit ultrasonic waves. The ultrasonic waves propagating in the gas or liquid medium are reflected by a reflector, and the reflected ultrasonic waves are received by the piezoelectric ceramic. The piezoelectric ceramic converts the received ultrasonic waves into electrical signals and transmits the electrical signals to the control circuit board. The control circuit board obtains the propagation speed of the ultrasonic waves in the gas or liquid medium based on the time information of the ultrasonic wave emission and reception of the piezoelectric ceramic, as well as the distance between the piezoelectric ceramic and the reflector, and thus obtains the temperature of the gas or liquid medium.

[0031] Now refer to Figures 1 to 5 The diagram schematically illustrates a temperature detection device according to a specific embodiment of the present invention. Specifically, Figure 1 A three-dimensional view of the temperature detection device is shown. Figure 2 A frontal cross-sectional view of the temperature detection device is shown. Figure 3 A top cross-sectional view of the temperature detection device is shown, which illustrates the control circuit board. Figure 4 A top cross-sectional view of the temperature detection device is shown, but the control circuit board is not shown. Figure 5 A perspective view of the control circuit board of the temperature detection device is shown.

[0032] like Figures 1 to 5 As shown, the temperature detection device includes: a housing 1, a piezoelectric ceramic 2, a reflector 3, and a control circuit board 4. The piezoelectric ceramic 2, reflector 3, and control circuit board 4 are disposed within the housing 1. The piezoelectric ceramic 2 is electrically connected to the control circuit board 4. A hollow tubular portion 11, closed at both ends, is formed within the housing 1. The piezoelectric ceramic 2 is disposed on the outer surface of one closed end face of the tubular portion 11. The reflector 3 is configured to extend inwardly from the side wall of the tubular portion 11. An opening 12 is provided on the side wall of the tubular portion 11. Preferably, the housing 1 can be integrally injection molded.

[0033] In actual operation, the gas or liquid medium to be detected is filled into the tubular section 11 through the opening 12. The control circuit board 4 controls the piezoelectric ceramic 2 to emit ultrasonic waves into the tubular section 11. The piezoelectric ceramic 2 receives the ultrasonic waves reflected by the reflector 3, converts the received ultrasonic waves into electrical signals, and transmits the electrical signals to the control circuit board 4. The control circuit board 4 obtains the time information of receiving ultrasonic waves based on the received electrical signals, and obtains the propagation speed of ultrasonic waves in the gas or liquid medium based on the time information of ultrasonic wave emission and reception, as well as the distance between the piezoelectric ceramic 2 and the reflector 3, thereby obtaining the temperature of the gas or liquid medium.

[0034] Continue as Figures 1 to 5 As shown, the side of the piezoelectric ceramic 2 facing the tubular portion 11 can be connected to the annular pin 41 of the control circuit board via conductive adhesive. The side of the piezoelectric ceramic 2 away from the tubular portion 11 is connected to the pin of the control circuit board via a metal connecting bridge 42. A groove is provided in the metal connecting bridge 42, and the piezoelectric ceramic 2 is disposed in the groove. Those skilled in the art will understand that, in addition to... Figures 1 to 5 The piezoelectric ceramic arrangement shown herein can be implemented in any suitable manner, with the piezoelectric ceramic housed in the housing and electrically connected to the control circuit board. These variations do not exceed the scope of protection of this invention.

[0035] Continue as Figures 1 to 5As shown, a mounting hole 13 is provided on the side wall of the tubular portion 11, and the reflector 3 is fastened in the mounting hole 13. Those skilled in the art will understand that, in addition to... Figures 1 to 5 The reflector arrangement shown can be implemented in any suitable manner within the tubular portion; these variations do not exceed the scope of this invention. Preferably, as... Figures 1 to 5 As shown, the ultrasonic reflecting surface 31 of the reflector 3 is parallel to the closed end face of the tubular part 11, which is beneficial for reflecting ultrasonic waves.

[0036] Those skilled in the art will understand that the shape, number, and material of the reflector can be adjusted according to actual needs to make the reflector suitable for reflecting ultrasonic waves and not easily contaminated by gaseous or liquid media. These modifications do not exceed the protection scope of this invention.

[0037] Those skilled in the art will understand that the shape and number of openings on the tubular portion can be adjusted according to actual needs, and these modifications do not exceed the scope of protection of this invention.

[0038] Those skilled in the art will understand that the temperature detection device of the present invention can be used to detect the temperature of any suitable type of gas or liquid medium, and these variations do not exceed the scope of protection of the present invention.

[0039] Compared with the prior art, the temperature detection device of the embodiments of the present invention has at least the following advantages:

[0040] In this invention, piezoelectric ceramics emit and receive ultrasonic waves, and the temperature of the gas or liquid medium is obtained based on the propagation speed of the ultrasonic waves in the gas or liquid medium. Because ultrasonic waves propagate very quickly, rapid detection of the temperature of the gas or liquid medium can be achieved. Furthermore, during operation, the piezoelectric ceramics do not come into direct contact with the gas or liquid medium being tested, thus preventing contamination by the gas or liquid medium.

[0041] In this invention, one side of the piezoelectric ceramic is connected to the annular pin of the control circuit board via conductive adhesive, and the other side of the piezoelectric ceramic is connected to the pin of the control circuit board via a metal connecting bridge, thereby realizing the electrical connection between the piezoelectric ceramic and the control circuit board.

[0042] In this invention, the piezoelectric ceramic is placed in the groove of the metal connecting bridge, thereby achieving reliable positioning of the piezoelectric ceramic.

[0043] In this invention, the reflector is secured in the mounting hole on the side wall of the tubular part, thereby achieving reliable positioning of the reflector.

[0044] In this invention, the ultrasonic reflecting surface of the reflector is parallel to the closed end face of the tubular part, which is beneficial for reflecting ultrasonic waves.

[0045] While the present invention has been disclosed above with reference to preferred embodiments, it is not limited thereto. Any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the invention should be included within the scope of protection of the invention. Therefore, the scope of protection of the invention should be determined by the scope defined in the claims.

Claims

1. A temperature detecting device characterized by comprising: The temperature detection device includes a housing and a piezoelectric ceramic, a reflector, and a control circuit board disposed within the housing. The piezoelectric ceramic is electrically connected to the control circuit board. A hollow tubular portion, closed at both ends, is formed within the housing. The piezoelectric ceramic is disposed on the outer surface of one closed end face of the tubular portion. The reflector extends inward from the side wall of the tubular portion, and an opening is provided on the side wall of the tubular portion. After the gas or liquid medium to be detected is filled into the tubular portion through the opening, the temperature detection device detects the temperature of the gas or liquid medium in the following manner: The control circuit board controls the piezoelectric ceramic to emit ultrasonic waves into the tubular portion; The piezoelectric ceramic receives ultrasonic waves reflected by the reflector, converts the received ultrasonic waves into electrical signals, and transmits the electrical signals to the control circuit board; and... The control circuit board obtains the time information of receiving ultrasonic waves based on the received electrical signal, and obtains the propagation speed of ultrasonic waves in the gas or liquid medium based on the time information of transmitting ultrasonic waves, the time information of receiving ultrasonic waves, and the distance between the piezoelectric ceramic and the reflector, thereby obtaining the temperature of the gas or liquid medium.

2. The temperature detecting device according to claim 1, wherein The side of the piezoelectric ceramic facing the tubular portion is connected to the annular pin of the control circuit board via conductive adhesive.

3. The temperature detecting device according to claim 1, wherein The side of the piezoelectric ceramic away from the tubular portion is connected to the pins of the control circuit board via a metal connecting bridge.

4. The temperature detecting device according to claim 3, wherein The metal connecting bridge has a groove, and the piezoelectric ceramic is disposed in the groove.

5. The temperature detecting device according to claim 1, wherein The tubular part has a mounting hole on its side wall, and the reflector is fastened in the mounting hole.

6. The temperature detecting device according to claim 1, wherein The ultrasonic reflecting surface of the reflector is parallel to the closed end face of the tubular section.

7. The temperature detection device according to claim 1, wherein, One or more openings are provided on the sidewall of the tubular portion.

8. The temperature detection device according to claim 1, wherein, The housing is integrally injection molded.

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