Ultrasonic fluid metering device

Abstract

An ultrasonic fluid metering device comprises a fluid channel, a plurality of ultrasonic sensors and a plurality of fixing covers, the fluid channel is provided with bearing holes between a fluid inlet and a fluid outlet, the first fasteners are positioned near the bearing holes, the ultrasonic sensors are mounted in the bearing holes of the fluid channel and alternately send and receive ultrasonic waves, and the fixing covers are fixed on the fluid channel. The fixing cover is provided with a second fastener corresponding to the first fastener, the fixing cover is buckled on the fluid channel through the second fastener and the first fastener, the ultrasonic sensor is fixed in the bearing hole of the fluid channel, and the fixing cover is in compression joint with a bump on a damping lantern ring of the ultrasonic sensor.

Description

Technical Field

[0001] The present utility model is generally an ultrasonic fluid metering device (ultrasonic flow meter). More specifically, it relates to a fluid channel structure and a fixing method for installing ultrasonic sensors in the fluid channel to accurately measure the flow rate of the fluid.

Background Art

[0002] The main components of an ultrasonic sensor are piezoceramics, an acoustic impedance matching layer, and a shock absorber. When a high-frequency alternating current signal is applied during the operation of the ultrasonic sensor, the piezoceramics therein will generate high-frequency vibrations. The high-frequency vibrations are a kind of sound wave. If the frequency of this sound wave falls within the ultrasonic range (>20 kHz), it is an ultrasonic vibration. However, in order for the generated ultrasonic wave to be transmitted from the piezoceramics to the fluid, the acoustic impedance of the piezoceramics must match that of the fluid. Therefore, an acoustic impedance matching layer must be provided on the piezoceramics to allow the ultrasonic wave to be smoothly transmitted to the fluid. Moreover, since the ultrasonic sensor relies on high-frequency vibrations to generate sound waves, in order for the ultrasonic sensor to quickly return to its stationary state after vibration, a shock-absorbing structure is also required to surround the piezoceramics to reduce aftershocks (ringing).

[0003] An ultrasonic fluid metering device mainly includes at least a pair of ultrasonic sensors installed upstream and downstream of a fluid channel. It measures the fluid flow velocity in the fluid channel by using the time difference (Difference Time of Flight, DToF) of ultrasonic waves propagating between the upstream and downstream of the fluid, and then multiplies the measured fluid flow velocity by the cross-sectional area of the pipeline. In this way, the fluid flow rate can be calculated. When the propagation direction of the ultrasonic wave is the same as that of the fluid (i.e., downstream flow), its propagation speed will be faster. Conversely (i.e., upstream flow), it will be slower.

[0004] The above-mentioned ultrasonic sensors are generally installed in bearing holes located upstream and downstream of the fluid channel, and a fixing cover is used to fix the ultrasonic sensors on the fluid channel. Therefore, the fixing cover must correctly and firmly fix the ultrasonic sensors in the bearing holes of the fluid channel to avoid interference and errors in ultrasonic fluid metering caused by poor installation or misalignment. Moreover, the contact area between the fixing cover and the ultrasonic sensors should be as small as possible to prevent the vibrations generated by the ultrasonic sensors from being transmitted into the fluid channel through the fixing cover.

Summary of the Utility Model

[0005] To enable readers to have a basic understanding of the present utility model, the following paragraphs present a brief description of the present utility model. This summary is not an exhaustive overview of the content of the present utility model and is not intended to indicate all the key or essential components of the present utility model or to limit the scope of the present utility model. Its purpose is only to present some of the concepts therein in a simplified form prior to the detailed description of the present utility model to be discussed later.

[0006] To stably fix an ultrasonic sensor on a fluid channel, the present utility model provides a fluid channel structure herein. By means of the crimping of the bumps designed on the ultrasonic sensor damping structure and the recesses designed on the fixing cover, the ultrasonic sensor can be stably installed on the fluid channel, and this installation method can greatly reduce the contact area between the ultrasonic sensor and the fixing cover and / or the fluid channel, avoiding the vibration generated by the ultrasonic sensor from being transmitted into the fluid channel through the fixing cover, resulting in interference and errors in fluid measurement.

[0007] One aspect of the present utility model is to provide an ultrasonic fluid metering device, comprising: a fluid channel having a fluid inlet and a fluid outlet, and having a partition plate and a bearing hole between the fluid inlet and the fluid outlet, and having a first fastener on the fluid channel near the bearing holes; a plurality of ultrasonic sensors, each ultrasonic sensor being installed in a bearing hole of the fluid channel and alternately transmitting and receiving ultrasonic waves, wherein each ultrasonic sensor comprises: a piezoelectric body; a bearing barrel having a bottom, a barrel body connected to the bottom, a barrel rim connected to the barrel body, and an opening opposite to the bottom surface, the bottom having an inner surface and an outer surface opposite to the inner surface, wherein the piezoelectric body is disposed on the inner surface of the bearing barrel and is located in the barrel body; an acoustic impedance matching layer disposed on the outer surface of the bearing barrel; and a damping collar covering the barrel rim or the barrel body of the bearing barrel and having bumps; a plurality of fixing covers, each fixing cover having a second fastener corresponding to the first fastener, the fixing cover being fastened to the fluid channel through the second fastener and the first fastener and fixing the ultrasonic sensor in the bearing hole of the fluid channel, and the fixing cover being crimped with the bumps of the damping collar.

[0008] Another aspect of the present utility model is to provide an ultrasonic fluid metering device, comprising: a fluid channel having a fluid inlet and a fluid outlet, and a partition plate and bearing holes are provided between the fluid inlet and the fluid outlet, and a first fastener is provided on the fluid channel near these bearing holes; a plurality of ultrasonic sensors, each ultrasonic sensor is installed in a bearing hole of the fluid channel and alternately transmits and receives ultrasonic waves, and each ultrasonic sensor comprises: a piezoelectric body; a bearing barrel having a bottom, a barrel body connected to the bottom, a barrel rim connected to the barrel body, and an opening opposite to the bottom surface, the bottom has an inner surface and an outer surface opposite to the inner surface, and the piezoelectric body is disposed on the inner surface of the bearing barrel and is located in the barrel body; an acoustic impedance matching layer disposed on the outer surface of the bearing barrel; and a shock-absorbing collar covering the barrel rim or the barrel body of the bearing barrel; a shock-absorbing body covering the piezoelectric body and having bumps, and the shock-absorbing collar exposes the shock-absorbing body and the acoustic impedance matching layer; a plurality of fixing covers, each fixing cover has a second fastener corresponding to the first fastener, and the fixing cover is fastened to the fluid channel through the second fastener and the first fastener and fixes the ultrasonic sensor in the bearing hole of the fluid channel, and the fixing cover is pressed against the bumps of the shock-absorbing body.

[0009] These and other objects of the present utility model will become more apparent and obvious after the reader has read the following detailed description of the preferred embodiments described in various figures and drawings.

Description of the Drawings

[0010] This specification contains drawings which form a part of this specification, so that the reader can have a further understanding of the embodiments of the present utility model. These drawings depict some embodiments of the present utility model and illustrate the principles thereof together with the description herein. In these drawings:

[0011] Figure 1 is a cross-sectional schematic diagram of an ultrasonic fluid channel according to an embodiment of the present utility model;

[0012] Figure 2 is another cross-sectional schematic diagram of the ultrasonic fluid channel according to an embodiment of the present utility model;

[0013] Figure 3 is a cross-sectional schematic diagram of an ultrasonic sensor according to an embodiment of the present utility model;

[0014] Figure 4 is a three-dimensional schematic diagram of an ultrasonic sensor according to an embodiment of the present utility model;

[0015] Figure 5 is a cross-sectional schematic diagram of an ultrasonic sensor according to another embodiment of the present utility model;

[0016] Figure 6 A cross-sectional schematic diagram of an ultrasonic sensor according to another embodiment of the present utility model;

[0017] Figure 7 A three-dimensional schematic diagram of a fixing cover according to an embodiment of the present utility model;

[0018] Figure 8 A three-dimensional schematic diagram of the fixing cover from another perspective according to an embodiment of the present utility model;

[0019] Figure 9 A partially enlarged cross-sectional schematic diagram of the fluid passage part where the ultrasonic sensor is installed according to an embodiment of the present utility model;

[0020] Figure 10 A partially enlarged cross-sectional schematic diagram of the fluid passage part where the ultrasonic sensor is installed according to another embodiment of the present utility model; and

[0021] Figure 11 A schematic diagram of an ultrasonic fluid metering device according to an embodiment of the present utility model.

[0022] It should be noted that all the diagrams in this specification are for illustrative purposes. For the sake of clarity and convenience in illustration, the components in the diagrams may be presented with exaggerated or reduced dimensions and proportions. Generally, the same reference signs in the diagrams are used to denote corresponding or similar component features in modified or different embodiments.

Detailed Embodiments

[0023] In the following detailed description of the present utility model, component symbols are marked in the accompanying diagrams and are represented in a specific example implementation manner. Such embodiments will illustrate sufficient details for those skilled in the art in this field to implement. For the sake of clarity in illustration, the dimensions of some components in the diagrams may be exaggerated. Readers should understand that other embodiments may also be utilized in the present utility model, or structural, logical, and electrical changes may be made without departing from the described embodiments. Therefore, the following detailed description should not be regarded as a limitation. Instead, the embodiments included therein will be defined by the scope of the appended claims.

[0024] First, please refer to Figure 1, which shows a schematic cross-sectional view of an ultrasonic fluid channel in an embodiment of the present utility model. In this embodiment, the ultrasonic fluid channel 100 is generally a tubular body, which can be a pipeline channel for conveying the fluid to be measured, such as an industrial gas pipeline or an industrial water pipeline, and its material can be steel, stainless steel, cast iron, polyvinyl chloride (PVC), copper, aluminum, titanium, cement, etc. The fluid channel 100 includes a fluid inlet 102 and a fluid outlet 104 opposite to each other across the fluid channel. The fluid to be measured will flow into the fluid channel 100 from the fluid inlet 102, pass through the fluid channel 100, and then flow out from the fluid outlet 104. In this embodiment, two bearing holes 105 are formed between the fluid inlet 102 and the fluid outlet 104 of the fluid channel 100, which are used to bear and install the ultrasonic sensors 200 required for the ultrasonic fluid metering device. More specifically, the fluid channel 100 is designed to have two laterally extending side tubes 106, and each side tube 106 defines the bearing hole 105 required for the fluid channel 100, that is, the side tube opening. Each ultrasonic sensor 200 is disposed in the bearing hole 105 of a side tube 106, and the bearing hole 105 is covered by a fixing cover 107, so as to fix the ultrasonic sensor 200 therein. It should be noted that although only two bearing holes 105 are shown in the figure of this embodiment, the present utility model is not limited thereto. In practice, the fluid channel 100 may have more than two bearing holes 105, depending on the practical design and requirements. In addition, in other embodiments, the fluid channel 100 may not have the side tubes 106, and the bearing holes 105 are directly formed on the tube wall of the fluid channel 100.

[0025] Please refer to Figure 2 , which shows the axial cross-section of the ultrasonic fluid channel 100 in an embodiment of the present utility model. In addition to the above-mentioned side tubes 106 and bearing holes 105, a partition plate 103 can also be provided between the fluid inlet 102 and the fluid outlet 104 of the fluid channel 100, and its material can be a metal sheet or a plastic sheet. Taking this embodiment as an example, the axial cross-section of the fluid channel 100 is rectangular, and the partition plates 103 can be arranged in parallel and spaced apart from each other within the fluid channel 100. The function of the partition plate 103 is to evenly divide the fluid channel 100 into several smaller channels 100a, ensuring that the fluid is in a laminar flow state in the propagation path of the ultrasonic wave, so as to achieve a rectifying effect and realize the accurate measurement of the fluid flow rate. It should be noted that the axial cross-section of the fluid channel 100 is not limited to a rectangle, and it can also be circular or other shapes, depending on the practical design and requirements.

[0026] Please refer to Figure 3, which is a cross-sectional schematic diagram of the ultrasonic sensor 200 part of the ultrasonic fluid metering device according to the embodiment of the present utility model. In a preferred embodiment of the present utility model, the ultrasonic sensor 200 includes a carrier bucket 201. The carrier bucket 201 has a bottom 208, a barrel body 211 connecting the bottom 208, and a barrel rim 210 connecting the barrel body 211, etc., and has an opening 207 relative to the bottom 208, wherein the bottom 208 has an inner surface 208a and an outer surface 208b relative to the inner surface 208a. In the embodiment, the material of the carrier bucket 201 can be metals such as aluminum, copper, titanium or stainless steel, or non-metals such as plastics, ceramics or glass. The piezoelectric body 202 is disposed on the inner surface 208a of the bottom 208 of the carrier 201 through the opening 207, so that the piezoelectric body 202 is located in the barrel body 211 of the carrier bucket 201, and the acoustic impedance matching layer 203 is disposed on the outer surface 208b of the bottom 208 of the carrier 201, and its position is relative to the piezoelectric body 202 through the bottom 208 of the carrier 201.

[0027] In the embodiment, the piezoelectric body 202 may include piezoelectric materials with a solid square, rectangular, polygonal or circular cross-section, or annular piezoelectric materials, or piezoelectric materials of a multi-layer ceramic process, or piezoelectric materials with grooves. These piezoelectric materials may include lead-containing piezoelectric materials such as lead zirconate titanate (Pb(ZrTi)O3) and lead titanate (PbTiO3), or lead-free piezoelectric materials such as barium titanate (BaTiO3) and sodium potassium niobate ((NaK)NbO3). Their acoustic impedance is about 30-35 MRayl, which is much greater than the acoustic impedance of air, 430 Rayl. Therefore, an acoustic impedance matching layer 203 needs to be provided to match the acoustic impedance of the two. Wires (not shown) can be connected to the conductive layer of the piezoelectric body 202 to electrically connect an external high-frequency alternating current signal to the piezoelectric body 202 to make it generate high-frequency vibrations, thereby emitting ultrasonic waves. The material of the acoustic impedance matching layer 203 can be a composite material composed of organic polymer materials and solid powders or hollow powders. The organic polymer materials include epoxy resin (Epoxy), vinyl ester resin, acrylic resin, ultraviolet curing glue (UV glue), or cyanate ester resin, etc. The hollow or solid powders can be hollow glass sphere particles or solid glass sphere particles, which are uniformly dispersed in the organic polymer materials as fillers to adjust the overall density of the acoustic impedance matching layer 203. The density of the hollow glass sphere particles is between 0.08 g / cm 3 ~0.8 g / cm 3(between grams per cubic centimeter). Since the acoustic impedance is generally proportional to the density of the material, the lower the density of the acoustic impedance matching layer 203, the lower the acoustic impedance that can be obtained, so the better the effect of acoustic impedance matching can be achieved. By adding glass bead particles with different volume ratios to the organic polymer material and performing processes such as mixing, degassing, and curing, the acoustic impedance matching layer 203 with different densities can be prepared.

[0028] See also Figure 3 . In addition to the piezoelectric body 202 and the acoustic impedance matching layer 203 described above, a shock-absorbing collar 204 is provided outside the carrier barrel 201. It can tightly cover the rim 210 and / or the barrel body 211 of the carrier barrel 201 and expose the acoustic impedance matching layer 203 thereon. The function of the shock-absorbing collar 204 in the present invention is to provide a shock-absorbing effect for the ultrasonic sensor 200. Since the ultrasonic sensor 200 generates sound waves by relying on high-frequency vibration, in order to enable the ultrasonic sensor to quickly return to its stationary state after vibration, shock-absorbing components need to be provided around the piezoelectric ceramic body to reduce aftershocks (ringing). In addition, the shock-absorbing collar 204 can also be used as a seal. When the ultrasonic sensor 200 is installed in the mounting hole 105 of the fluid passage 100 (see Figure 1 ), it can fix the position of the ultrasonic sensor 200 and seal the pipeline to prevent fluid from flowing out. The shock-absorbing collar 204 can be an elastomer, and its material can include silicone, rubber, ethylene vinyl acetate copolymer (EVA), styrene elastomer, polyester elastomer, olefin elastomer, thermoplastic vulcanizates (TPV), thermoplastic polyurethane (TPU), epoxy resin, or cork.

[0029] See also Figure 3 . In the embodiment, the shock-absorbing collar 204 is designed with bumps 205, which protrude in a vertical direction relative to the acoustic impedance matching layer 203 after the shock-absorbing collar 204 is installed. More specifically, please refer to Figure 4, which is a three-dimensional schematic diagram of the ultrasonic sensor 200. The shock-absorbing collar 204 covers almost the entire rim and the body 211 of the bearing barrel 201, and only part of the body 211 and the bottom 208 are exposed from the shock-absorbing collar 204, while the acoustic impedance matching layer 203 thereon is also exposed. The bumps 205 of the shock-absorbing collar 204 are evenly distributed on the periphery of the bottom surface of the shock-absorbing collar 204, and can achieve the effect of fixing the ultrasonic sensor 200 after the ultrasonic sensor 200 is installed, and there will be further descriptions in the subsequent embodiments. It should be noted that in the embodiments of the present invention, the bottom surface of the shock-absorbing collar 204 is not limited to a circular shape, and it can also be other shapes, and the bumps 205 thereon are not limited to three pieces, which depends on the actual design and requirements.

[0030] Please refer to Figure 5 , which is a cross-sectional schematic diagram of an ultrasonic sensor according to another embodiment of the present invention. In this embodiment, the ultrasonic sensor 200 further has a shock-absorbing body 212, which covers and is in direct contact with the piezoelectric body 202 disposed in the bearing barrel 201, and the shock-absorbing body 212 will be exposed from the opening of the shock-absorbing collar 204. The function of the shock-absorbing body 212 is similar to that of the shock-absorbing collar 204, providing a shock-absorbing effect for the piezoelectric body 202 part to enable it to quickly return to a stationary state to reduce aftershocks. Similarly, the shock-absorbing body 212 can be an elastomer, and its materials can include silicone, rubber, ethylene vinyl acetate (EVA), styrene elastomer, polyester elastomer, olefin elastomer, thermoplastic vulcanizates (TPV), thermoplastic polyurethane (TPU), epoxy resin or cork. In some embodiments, the shock-absorbing body 212 can also fill the remaining space in the bearing barrel 201. In still other embodiments, the shock-absorbing body 212 may also be a part of the shock-absorbing collar 204, and the two are integrally formed and jointly provide a shock-absorbing effect for the ultrasonic sensor 200, but this is not limited thereto.

[0031] Please refer to Figure 6 , which is a cross-sectional schematic diagram of an ultrasonic sensor according to still another embodiment of the present invention. The design of this embodiment is the same as the above Figure 5The embodiments are similar with minor differences. The only difference is that the bump 205 originally designed on the shock-absorbing collar 204 is changed to be designed on the shock-absorbing body 212, which can also achieve the effect of fixing the ultrasonic sensor 200 after the ultrasonic sensor 200 is installed. In some embodiments, the shock-absorbing body 212 and the shock-absorbing collar 204 may both have the bump 205 feature, which is not limited thereto.

[0032] Now please refer to Figure 7 and Figure 8 , which are perspective schematic views of the fixing cover 107 part of the ultrasonic fluid metering device according to the embodiments of the present invention from two different perspectives. In the embodiments of the present invention, each fixing cover 107 is designed to seal a bearing hole 105 of the fluid passage 100 (as Figure 1 shown) and fix the ultrasonic sensor 200 disposed therein. For this purpose, each fixing cover 107 will have a fastener 302 part or feature, which can correspond to the fastener part or feature on the fluid passage 100 to achieve a fastening and fixing mechanism. An opening 108 will also be formed on the top surface of the fixing cover 107, which allows the signal line connecting the ultrasonic sensor 200 to the external circuit to pass through. In some embodiments, as Figure 8 shown, the fixing cover 107 has an inner bottom surface 303, on which a plurality of recesses 301 may be formed. The number, shape and position of the recess 301 feature can correspond to the bump 205 feature on the aforementioned shock-absorbing body 212 and / or shock-absorbing collar 204, which can enhance the effect of the fixing cover 107 in fixing the position of the ultrasonic sensor 200. In the embodiment, the material of the fixing cover 107 can be metals such as aluminum, copper, titanium or stainless steel, or non-metals such as plastics, ceramics or glass. It should be noted that the fastener 302 of the fixing cover 107 is not limited to the snap shown in the figure, and it can be any suitable fastener, such as screws, rubber rings or Velcro, depending on the practical requirements.

[0033] Now please refer to Figure 9, which is a partial enlarged cross-sectional schematic diagram of the fluid channel 100 according to this embodiment, and details the state in which the ultrasonic sensor 200 is fixed on the bearing hole 105 of the fluid channel 100 through the fixing cover 107. As shown in the figure, in a preferred embodiment, the ultrasonic sensor 200 is arranged on the bearing hole 105 in such a way that the shock-absorbing collar 204 thereof contacts the pipe wall of the fluid channel 100. Specifically, the shock-absorbing collar 204 located at the rim and the body of the bearing barrel of the ultrasonic sensor 200 will contact the pipe wall or the pipe surface of the fluid channel 100. The acoustic impedance matching layer 203 of the ultrasonic sensor 200 will be arranged to face the inside of the fluid channel 100 to send ultrasonic waves into the pipe, and the piezoelectric body 202 of the ultrasonic sensor 200 is preferably arranged to face the outside of the fluid channel 100 to facilitate the signal wire connecting the piezoelectric body 202 to extend to the outside through the opening 108 on the fixing cover 107. After the ultrasonic sensor 200 is installed, the fixing cover 107 will cover the ultrasonic sensor 200 from outside the pipe, and it is installed on the bearing hole 105 by means of the fastener 302 (such as an opening) on the fixing cover 107 engaging with the corresponding fastener 109 (such as a protrusion) formed on the fluid channel 100 near the bearing hole 105. It should be noted that after the fixing cover 107 is installed, the bump 205 on the shock-absorbing collar 204 will press against and apply pressure to the corresponding recess 301 on the fixing cover 107, and together with the elastic buffer provided by the shock-absorbing collar 204 itself, the ultrasonic sensor 200 can be firmly fixed in the space between the fixing cover 107 and the bearing hole 105 after such engagement, avoiding interference or errors in flow measurement caused by poor installation or positioning of the ultrasonic sensor, which is a major advantage of the present utility model. Also due to the existence of the bump 205, the contact area between the ultrasonic sensor and the fixing cover and / or the fluid channel can be greatly reduced, avoiding the vibration generated by the ultrasonic sensor from being transmitted into the fluid channel through the fixing cover, causing interference and errors in fluid metering.

[0034] Please refer to Figure 10 , which is a partial enlarged cross-sectional view of the fluid channel 100 according to another embodiment of the present utility model. The design of this embodiment is similar to the previous Figure 9 embodiment, the difference being that the fixing cover 107 does not have a recess 301, and the bump 205 on the shock-absorbing collar 204 directly presses against the inner bottom surface 303 of the fixing cover 107. Such a design can also firmly fix the ultrasonic sensor 200 in the space between the fixing cover 107 and the bearing hole 105 through the elastic buffer provided by the shock-absorbing collar 204.

[0035] Now please refer to Figure 11, which is a schematic diagram of an ultrasonic fluid metering device according to an embodiment of the present utility model. In this embodiment, it can be seen that the installed ultrasonic sensor 200 can extend to the outside through the opening 108 on the fixed cover 107 via the signal line 110. Through the signal line 110, the ultrasonic sensor 200 can be connected to an external circuit board 400. During operation, the circuit board 400 is used to drive the ultrasonic sensor 200. Specifically, the transmitting / receiving unit 402 in the circuit board 400 can send signals to the ultrasonic sensor 200 through the signal line 110, driving the ultrasonic sensor 200 to alternately send ultrasonic waves into the fluid channel 100 and receive its reflected waves or direct waves. Thus, by measuring the time it takes for the ultrasonic waves emitted from the ultrasonic sensor 200A located upstream of the channel to reach the ultrasonic sensor 200B located downstream, and the time it takes for the ultrasonic waves emitted from the ultrasonic sensor 200B located downstream to reach the ultrasonic sensor 200A located upstream, the arithmetic unit 404 in the circuit board 400 can calculate the flow velocity of the fluid to be measured based on these data, and multiplying it by the cross-sectional area of the pipeline can obtain the flow rate.

[0036]

Symbol Explanation

[0037] 100 Fluid channel

[0038] 100a Smaller channel

[0039] 102 Fluid inlet

[0040] 103 Partition board

[0041] 104 Fluid outlet

[0042] 105 Bearing hole

[0043] 106 Side pipe

[0044] 107 Fixed cover

[0045] 108 Opening

[0046] 109 Fastener

[0047] 110 Signal line

[0048] 200 Ultrasonic sensor

[0049] 200A Ultrasonic sensor

[0050] 200B Ultrasonic sensor

[0051] 201 Bearing bucket

[0052] 202 Piezoelectric body

[0053] 203 Acoustic impedance matching layer

[0054] 204 shock-absorbing collar

[0055] 205 bump

[0056] 207 opening

[0057] 208 bottom

[0058] 208a inner surface

[0059] 208b outer surface

[0060] 210 barrel rim

[0061] 211 barrel body

[0062] 212 shock-absorbing body

[0063] 301 recess

[0064] 302 fastener

[0065] 303 inner bottom surface

[0066] 400 circuit board

[0067] 402 transmitting / receiving unit

[0068] 404 arithmetic unit

Claims

1. An ultrasonic fluid metering device, comprising: A fluid channel, the fluid channel having a fluid inlet and a fluid outlet, and having a partition plate and a bearing hole between the fluid inlet and the fluid outlet, and a first fastener on the fluid channel near the bearing holes; A plurality of ultrasonic sensors, each of which is installed in a bearing hole of the fluid channel and alternately transmits and receives ultrasonic waves, wherein each of the ultrasonic sensors comprises: A piezoelectric body; A carrying barrel, comprising a bottom, a barrel body connected to the bottom, a barrel edge connected to the barrel body, and an opening opposite to the bottom, wherein the bottom has an inner surface and an outer surface opposite to the inner surface, wherein the piezoelectric body is disposed on the inner surface of the carrying barrel and is located in the barrel body; an acoustic impedance matching layer, disposed on the outer surface of the carrying barrel; and A shock-absorbing collar, covering the barrel edge or the barrel body of the carrying barrel and having a protrusion; A plurality of fixing covers, each of which has a second fastener corresponding to the first fastener, the fixing cover is fastened to the first fastener on the fluid channel through the second fastener and fixes the ultrasonic sensor in the bearing hole of the fluid channel, and the fixing cover is crimped with the protrusion of the shock-absorbing ring.

2. The ultrasonic fluid metering device according to claim 1, characterized in that: The fixing cover has an inner bottom surface, and the inner bottom surface is pressed with the protrusion.

3. The ultrasonic fluid metering device according to claim 1, characterized in that: The fixing cover has an inner bottom surface and a concave portion located on the inner bottom surface, and the concave portion is pressed with the protrusion.

4. The ultrasonic fluid metering device according to claim 1, wherein: The ultrasonic sensor further comprises a shock absorbing body covering the piezoelectric body, and the shock absorbing ring covers the shock absorbing body and exposes the acoustic impedance matching layer.

5. The ultrasonic fluid metering device according to claim 1, wherein: The partition plate of the fluid channel is a metal sheet or a plastic sheet.

6. The ultrasonic fluid metering device according to claim 1, characterized in that: The shock-absorbing ring of the ultrasonic sensor is an elastomer, and its material includes silicone, rubber, ethylene-vinyl acetate copolymer, styrene elastomer, polyester elastomer, olefin elastomer, thermoplastic vulcanized rubber, thermoplastic polyurethane, epoxy resin or cork.

7. The ultrasonic fluid metering device according to claim 1, characterized in that: The material of the carrying bucket of the ultrasonic sensor includes aluminum, copper, titanium or stainless steel.

8. The ultrasonic fluid metering device according to claim 1, wherein: The material of the carrying bucket of the ultrasonic sensor includes plastic, ceramic or glass.

9. The ultrasonic fluid metering device according to claim 1, characterized in that: It further comprises a circuit board connected to the ultrasonic sensors, the circuit board having a transmitting / receiving unit and a computing unit for driving the ultrasonic sensors to alternately transmit / receive the ultrasonic waves and calculate the transmission time of the ultrasonic waves to calculate the flow rate through the fluid channel.

10. An ultrasonic fluid metering device, comprising: A fluid channel, the fluid channel having a fluid inlet and a fluid outlet, and having a partition plate and a bearing hole between the fluid inlet and the fluid outlet, and a first fastener on the fluid channel near the bearing holes; A plurality of ultrasonic sensors, each of which is installed in a bearing hole of the fluid channel and alternately transmits and receives ultrasonic waves, wherein each of the ultrasonic sensors comprises: A piezoelectric body; A carrying barrel, comprising a bottom, a barrel body connected to the bottom, a barrel edge connected to the barrel body, and an opening opposite to the bottom, wherein the bottom has an inner surface and an outer surface opposite to the inner surface, wherein the piezoelectric body is disposed on the inner surface of the carrying barrel and is located in the barrel body; an acoustic impedance matching layer, disposed on the outer surface of the carrying barrel; and A shock-absorbing ring, covering the barrel edge or the barrel body of the carrying barrel; A shock absorbing body, covering the piezoelectric body and having a protrusion, and the shock absorbing ring exposes the shock absorbing body and the acoustic impedance matching layer; A plurality of fixing covers, each of which has a second fastener corresponding to the first fastener, the fixing cover is fastened to the first fastener on the fluid channel through the second fastener and fixes the ultrasonic sensor in the bearing hole of the fluid channel, and the fixing cover is crimped with the protrusion of the shock absorber.

11. The ultrasonic fluid metering device according to claim 10, characterized in that: The fixing cover has an inner bottom surface, and the inner bottom surface is pressed with the protrusion.

12. The ultrasonic fluid metering device according to claim 10, characterized in that: The fixing cover has an inner bottom surface and a concave portion located on the inner bottom surface, and the concave portion is pressed with the protrusion.

13. The ultrasonic fluid metering device according to claim 10, characterized in that: The partition plate of the fluid channel is a metal sheet or a plastic sheet.

14. The ultrasonic fluid metering device according to claim 10, characterized in that: The shock-absorbing ring of the ultrasonic sensor is an elastomer, and its material includes silicone, rubber, ethylene-vinyl acetate copolymer, styrene elastomer, polyester elastomer, olefin elastomer, thermoplastic vulcanized rubber, thermoplastic polyurethane, epoxy resin or cork.

15. The ultrasonic fluid metering device according to claim 10, characterized in that: The shock absorber of the ultrasonic sensor is an elastomer, and its material includes silicone, rubber, ethylene-vinyl acetate copolymer, styrene elastomer, polyester elastomer, olefin elastomer, thermoplastic vulcanized rubber, thermoplastic polyurethane, epoxy resin or cork.

16. The ultrasonic fluid metering device according to claim 10, characterized in that: The material of the carrying bucket of the ultrasonic sensor includes aluminum, copper, titanium or stainless steel.

17. The ultrasonic fluid metering device according to claim 10, characterized in that: The material of the carrying bucket of the ultrasonic sensor includes plastic, ceramic or glass.

18. The ultrasonic fluid metering device according to claim 10, characterized in that: It further comprises a circuit board connected to the ultrasonic sensors, the circuit board having a transmitting / receiving unit and a computing unit for driving the ultrasonic sensors to alternately transmit / receive the ultrasonic waves and calculate the transmission time of the ultrasonic waves to calculate the flow rate through the fluid channel.

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