An ultrasonic transducer and its application

Abstract

The application provides an ultrasonic transducer of a box body and application thereof, and belongs to the technical field of sensors, and comprises a back pressure box, a gas inlet part is sealingly connected to the back pressure box, and a fixing frame is sealingly connected to the gas inlet part; a pressure storage channel is arranged in the gas inlet part and is in communication with the back pressure box and the fixing frame; at least one gas inlet channel is formed in the gas inlet part and is in communication with the pressure storage channel; when the box body is placed in a closed environment filled with gas, the end of the fixing frame is subjected to a certain gas pressure; wherein the gas enters the pressure storage channel through the gas inlet channel, is stored at the back pressure box, and is guided to the back pressure end of the fixing frame through the end of the pressure storage channel, so as to form pressure balance with the gas pressure on the end of the fixing frame. The application can realize normal work of the sensor in a high-pressure environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensors, in particular to a box body and an ultrasonic transducer using the same. BACKGROUND

[0002] When an ultrasonic transducer is used in a closed environment filled with gas, the end face of the sensor is easily subjected to gas pressure because the container is provided with a certain gas pressure. The conventional sensor has a small pressure-bearing capacity due to its product properties, and its characteristic index will be damaged when the pressure exceeds its limit, so it cannot be used. At present, the ultrasonic instrument used in the domestic natural gas application scene generally has a pressure resistance value of ≤1.6 MPa, mainly because the internal core components of the instrument can only withstand a pressure of 1.6 MPa, so it cannot be used in more scenes with high pressure resistance in natural gas collection and processing. SUMMARY

[0003] To solve the above problems, the purpose of the present application is to provide a box body and an ultrasonic transducer using the same, which can solve the problem of small pressure resistance value of the existing sensor and can stably improve the pressure resistance of the low-pressure sensor.

[0004] The present application provides the following technical solutions.

[0005] A box body comprises a back pressure box, a gas inlet member is sealingly connected to the back pressure box, and a fixing frame is sealingly connected to the gas inlet member;

[0006] The gas inlet member is provided with a pressure accumulation channel that is in communication with the back pressure box and the fixing frame, and at least one gas inlet channel that is in communication with the pressure accumulation channel is formed in the gas inlet member;

[0007] When the box body is placed in a closed environment filled with gas, the end of the fixing frame is subjected to a certain gas pressure; wherein the gas enters the pressure accumulation channel through the gas inlet channel, accumulates pressure at the back pressure box, and guides the pressure to the back pressure end of the fixing frame through the end of the pressure accumulation channel, so as to form pressure balance with the gas pressure received by the end of the fixing frame.

[0008] Preferably, the fixing frame is used for mounting a pressure-bearing object; and the cross-sectional area of the pressure accumulation channel of the gas inlet member at the end close to the fixing frame is the same as the pressure-receiving end surface area of the pressure-bearing object close to the pressure accumulation channel.

[0009] Preferably, the gas inlet channel is a plurality of gas inlet channels.

[0010] Preferably, the back pressure box and the gas inlet member are connected by an O-shaped sealing ring.

[0011] An ultrasonic transducer comprises the box body.

[0012] Preferably, the ultrasonic transducer core is further included; the fixing frame has an inner cavity for placing the ultrasonic transducer core, and the ultrasonic transducer core is installed on the fixing frame.

[0013] Preferably, the back pressure box is penetrated by a lead pin, and the lead pin is fixed by glass sintering sealing; the lead pin located outside the back pressure box is connected with an external wire harness and then sealed by a first sealing ring and a pouring epoxy resin; the lead pin located inside the back pressure box is connected with a wire harness of the ultrasonic transducer core and then sealed by a second sealing ring and a pouring epoxy resin.

[0014] Preferably, the buffer pad is further included; the buffer pad is arranged between the ultrasonic transducer core and the air inlet member.

[0015] Preferably, the longitudinal section of the ultrasonic transducer core and the inner cavity of the fixing frame are both T-shaped.

[0016] The present application has the following beneficial effects:

[0017] When the box body is in a sealed container full of gas pressure, the gas in the sealed container enters the pressure storage channel through the air inlet channel, and the gas is guided to the inner wall of the box cover and the head of the pressure-bearing object through the pressure storage channel. Among them, the gas pressure generated by the pressure storage at the box cover is transmitted to the head of the pressure-bearing object through the pressure storage channel, so that the head of the pressure-bearing object bears the gas pressure generated by the pressure storage at the box cover and the tail of the pressure-bearing object located at the end of the fixing frame bears the gas pressure generated by the sealed container to reach a balanced state. Since the head and tail of the pressure-bearing object bear balanced gas pressure, the situation of one end being pressed is avoided, and the pressure resistance value can be effectively improved.

[0018] When the present application is applied to an ultrasonic transducer, pressure conduction is performed through the box body structure, so that the back and front pressures of the ultrasonic transducer are balanced to improve the pressure resistance performance of the ultrasonic transducer, the original pressure resistance value of the ultrasonic transducer is stably improved, and the ultrasonic transducer can work stably. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall assembly structure of the embodiment of the present application;

[0020] Figure 2 is a schematic diagram of the structure of the back pressure box of the embodiment of the present application;

[0021] Figure 3 is a schematic diagram of the structure of the air inlet member of the embodiment of the present application;

[0022] Figure 4 is a schematic diagram of the structure of the ultrasonic transducer of the embodiment of the present application.

[0023] In the diagram: 1. First sealing ring; 2. Lead pin; 3. Back pressure box; 4. Second sealing ring; 5. O-ring seal; 6. Air inlet channel; 7. Air inlet component; 8. Buffer pad; 9. Wiring harness; 10. Ultrasonic transducer core; 11. Fixing bracket. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] Example 1

[0026] An ultrasonic transducer housing and its application, such as... Figures 1-4 As shown, the main body includes a back pressure box 3, an air inlet 7, and a fixing frame 11. The air inlet 7 is sealed to the back pressure box 3, and the fixing frame 11 is sealed to the air inlet 7. The air inlet 7 has a pressure accumulating channel inside that communicates with the back pressure box 3 and the fixing frame 11, and at least one air inlet channel 6 is opened on the air inlet 7 that communicates with the pressure accumulating channel. When the box is placed in a sealed environment filled with gas, the end of the fixing frame 11 is subjected to a certain air pressure; wherein, after the gas enters the pressure accumulating channel through the air inlet channel 6, it is pressurized at the back pressure box 3, and the pressure is guided through the end of the pressure accumulating channel to the back pressure end of the fixing frame 11, forming a pressure balance with the air pressure subjected to the end of the fixing frame 11.

[0027] Furthermore, the back pressure box 3 and the air intake component 7 are connected by an O-ring seal 5.

[0028] The ultrasonic transducer core 10 is mounted on the pressure balancing device via a mounting bracket 11, which has an inner cavity for housing the ultrasonic transducer core 10. A buffer pad 8 is positioned on top of the ultrasonic transducer core 10, separating the lower ends of the ultrasonic transducer core 10 and the air inlet 7; the buffer pad 8 is made of non-metallic material. A pin 2 passes through the back pressure box 3, and the pin 2 is sealed and fixed to the back pressure box 3 by glass sintering; the pin 2 located inside the back pressure box 3 is connected to the wiring harness 9 of the ultrasonic transducer core 10 and then sealed by a second sealing ring 4 and epoxy resin; the pin 2 located outside the back pressure box 3 is connected to an external wiring harness, and after connection, the first sealing ring 1 is filled with epoxy resin. Preferably, the first sealing ring 1 and the second sealing ring 4 are integrally formed with the back pressure box 3, resulting in better sealing and insulation effects.

[0029] To ensure that gas flows smoothly and quickly into the pressure accumulator channel, there must be at least one intake channel 6, and the number of intake channels 6 should not reduce the yield strength of the intake component 7. Increasing the number of intake channels 6 allows for rapid pressure balance at both ends, achieving pressure resistance.

[0030] In order to ensure sufficient back pressure, the pressure storage channel of the air inlet part 7 contacts the back pressure surface of the ultrasonic transducer core 10, and the contact surface is greater than or equal to the back pressure end of the ultrasonic transducer core 10.

[0031] The installation object of the embodiment is an ultrasonic transducer, and further comprises a fixing frame 11 for erecting the ultrasonic transducer; the cross section of the ultrasonic transducer core 10 and the inner cavity of the fixing frame 11 are both T-shaped, and the ultrasonic transducer core 10 is erected on the installation groove.

[0032] The buffer pad 8 is arranged to protect the ultrasonic transducer. The wire harness 9 of the ultrasonic transducer core 10 passes through the middle of the buffer pad 8, and the buffer pad 8 is arranged on the top of the ultrasonic transducer core 10 and separates the ultrasonic transducer core 10 and the lower end of the air inlet part 7.

[0033] In the embodiment, the following preparation process is included:

[0034] The structure 1 and the back pressure box 3 are as shown in Figure 2 : the main body material is a metal material, and the structure is composed of two parts: a box body and an alloy material. The alloy material is formed on the box body by glass sintering to form the lead pin 2, and the production process is as follows:

[0035] (1) First, machine the box body.

[0036] (2) Glass cleaning: first configure the glass cleaning solution, immerse the glass tube in the cleaning solution for 1 minute, then wipe the inner wall of the glass tube with a brush, then rinse with tap water, then rinse with absolute ethanol, and dry for standby.

[0037] (3) Alloy material cleaning: degreasing treatment in an ultrasonic cleaning machine with gasoline, and then degreasing treatment in an ultrasonic cleaning machine with acetone, and then drying for standby.

[0038] (4) Hydrogen treatment of the alloy material.

[0039] (5) Put the glass tube into the hole of the machined box body, then put the alloy material into the glass tube on the fixed tool, and then melt and seal the alloy material and the glass tube on the flame. Before melting and sealing, the alloy material needs to be oxidized on the flame to red or dark red.

[0040] (6) Then, the cooled box body is subjected to electroplating treatment to improve the trace beautification of the sintered product.

[0041] This part mainly provides a back-end air pressure lifting storage function in a balanced state, lifts and stores the gas introduced from the outside to ensure that the gas is transmitted to the back of the ultrasonic transducer core 10;

[0042] Structure 2, air inlet part 7, as shown in Figure 3As shown: the main body material adopts metal material, the size only needs to ensure the assembly with the back pressure box 3 and the fixing frame 11, adopts the machine tool processing mode, the surface is not treated, after being connected with the back pressure box 3, the position exposed outside is punched near the back pressure box 3, that is, the air inlet channel 6, the inner cavity of the air inlet piece 7 is a hollow structure, that is, the pressure storage channel, the cavity contact surface of the back pressure surface of the ultrasonic transducer core 10 is equal to the back pressure end of the ultrasonic transducer core 10, an axial hole is formed in one end of the air inlet piece 7 towards the fixing frame 11, the axial hole needs to be penetrated with the pressure storage channel of the air inlet piece 7 to ensure that the internal gas pressure can be transmitted to the back surface of the ultrasonic transducer core 10; because the air inlet piece 7 and the back pressure box 3 are inserted and matched, in order to ensure sufficient pressure storage space, the volume of the pressure storage channel of the air inlet piece 7 needs to be at least kept the same as the volume of the ultrasonic transducer core 10. In order to ensure sufficient reverse pressure, the contact surface of the back pressure surface of the ultrasonic transducer core 10 is greater than or equal to the back pressure end of the ultrasonic transducer core 10.

[0043] Structure 3, internal buffer pad 8, annular gasket, the size is determined according to the external structure of the transducer, and the compression amount is preferably controlled at 0.1-0.3mm in assembly, and the machine processing mode is adopted; the buffer pad 8 mainly provides that the air inlet piece 7 does not directly act on the matching layer material of the ultrasonic transducer core 10, and the metal directly acts on the non-metal composite material, which can cause damage of the composite material. In this way, the ultrasonic transducer core 10 can be fastened without damaging the composite material at the front end of the ultrasonic transducer.

[0044] Structure 4, front end transducer connecting support 11; the material is metal, the size is determined according to the structure of the ultrasonic transducer core 10, and the machine processing mode is adopted; the main function is to assemble and fix the ultrasonic transducer core 10.

[0045] Structure 5, sealing structure; this part is integrally formed with the back pressure box 3, and can also be fixed on the back pressure box 3 by using a non-metal material through an adhesive, and then the inside of the hollow sealing ring is filled with epoxy, and the lead terminal is wrapped with epoxy, so that water vapor is prevented from entering the back pressure box lead terminal to cause positive and negative electrode contact.

[0046] In the embodiment, the specific assembly process is shown in the following steps:

[0047] Step 1: according to the ultrasonic transducer core 10 design outer wrapping structure as shown in each component. Figure 1

[0048] Step 2: cut the wire harness 9 of the ultrasonic transducer core 10 to the length required for assembling the shell.

[0049] Step 3: bond the PCB wiring board and the first sealing ring 1 outside the back pressure box 3 and weld the external lead; and fill the epoxy at the wiring sealing ring to isolate the water vapor and the wiring port contact, to prevent the positive and negative electrodes from being conducted.

[0050] ​Step 4: Assemble the ultrasonic transducer core 10 into the fixing frame 11, ensuring proper assembly.

[0051] Step 5: Place the buffer pad 8 over the ultrasonic transducer core 10 through the wire harness 9 of the ultrasonic transducer core 10.

[0052] Step 6: Connect the air inlet piece 7 to the fixing frame 11 and install the O-ring 5.

[0053] Step 7: Weld the wire harness 9 of the ultrasonic transducer core 10 to the inside of the back pressure box 3.

[0054] Step 8: Fill the epoxy inside the back pressure box 3 at the sealing ring to isolate moisture and contact the wire port, preventing positive and negative conduction.

[0055] Step 9: The O-ring 5 connects the back pressure box 3 and the air inlet piece 7.

[0056] Step 10: Laser print identification marks on the finished product sensor shell, and the finished product is ready for testing.

[0057] Working principle: When there is gas passing through the pipeline, the gas enters from the air inlet 6 of the air inlet piece 7 and then reaches the back pressure box 3, which accumulates pressure and transmits the pressure to the back of the ultrasonic transducer core 10 through the axial hole of the air inlet piece 7, then the ultrasonic transducer core 10 is fixed and connected to the air inlet piece 7 through the front fixing frame 11, and the back pressure box 3 is locked on the instrument body, at this time the back pressure box 3 accumulates pressure to lift the air inlet piece 7 and transmits the pressure to the back of the ultrasonic transducer core 10, so that the back of the transducer and the front end pressure are balanced, thereby improving the pressure resistance of the sensor.

[0058] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, and improvement within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cartridge, characterized by, The back pressure box (3) is sealed with an air inlet part (7), and the air inlet part (7) is sealed with a fixing frame (11); The air inlet part (7) is internally provided with a pressure storage channel communicated with the back pressure box (3) and the fixing frame (11), and the air inlet part (7) is provided with at least one air inlet channel (6) communicated with the pressure storage channel; When the box body is placed in a closed environment full of gas, the end of the fixing frame (11) is subjected to a certain gas pressure; wherein the gas enters the pressure storage channel through the air inlet channel (6), is stored at the back pressure box (3), and the pressure is guided to the back pressure end of the fixing frame (11) through the end of the pressure storage channel, and pressure balance is formed with the gas pressure of the end of the fixing frame (11); The fixing frame (11) is used for mounting pressure-bearing articles; the cross-sectional area of the pressure storage channel of the air inlet part (7) close to the fixing frame (11) is the same as the pressure-bearing surface area of the pressure-bearing articles close to the pressure storage channel; The back pressure box (3) and the air inlet part (7) are connected through an O-shaped sealing ring (5).

2. The cartridge of claim 1, wherein The air inlet channel (6) is multiple.

3. An ultrasonic transducer, characterized by, The box body comprises any one of claims 1-2.

4. An ultrasonic transducer according to claim 3, wherein, Further comprising an ultrasonic transducer core (10); the fixing frame (11) has an inner cavity for placing the ultrasonic transducer core (10), and the ultrasonic transducer core (10) is mounted on the fixing frame (11).

5. An ultrasonic transducer according to claim 4, wherein, The back pressure box (3) is penetrated by a lead pin (2), and the lead pin (2) and the back pressure box (3) are sealed and fixed through glass sintering; the lead pin (2) outside the back pressure box (3) is connected with an external wire harness and then sealed through a first sealing ring (1) and a pouring epoxy resin; the lead pin (2) inside the back pressure box (3) is connected with a wire harness (9) of the ultrasonic transducer core (10) and then sealed through a second sealing ring (4) and a pouring epoxy resin.

6. An ultrasonic transducer according to claim 4, wherein, Further comprising a buffer pad (8); the buffer pad (8) is arranged between the ultrasonic transducer core (10) and the air inlet part (7).

7. An ultrasonic transducer according to claim 4, wherein, The longitudinal section of the inner cavity of the ultrasonic transducer core (10) and the fixing frame (11) is T-shaped.

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