Low-space ultrasonic level transmitter
By using two inclined mounted ultrasonic oscillators and transverse electronic unit design in the ultrasonic level transmitter, the technical problems of level measurement requirements in narrow spaces are solved, the equipment height is reduced and the blind spot is reduced, and the measurement reliability and stability are ensured.
Patent Information
- Application Number
- CN202421431495.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-06-21
AI Technical Summary
The existing ultrasonic level transmitters are not suitable for installation applications in confined spaces. They have a large height and large blind spots, and cannot meet the needs of level measurement in confined spaces.
A low-space ultrasonic level transmitter is designed, using two ultrasonic oscillators and efficiently transmit and receive ultrasonic waves through matching layers. The ultrasonic oscillators remain relatively inclined to reduce blind spots, and signal cables are drawn out through transverse electronic units and sides to reduce the height of the equipment.
The height of the level transmitter is reduced, the blind spot is reduced, and the acoustic beam angle is small. It is suitable for the level measurement needs in narrow spaces, and the measurement reliability and stability are ensured.
Smart Images
Figure CN222561067U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of level measurement, and in particular to a short-space ultrasonic level transmitter. Background Art
[0002] Ultrasonic level transmitters are used for level measurement, that is, for measuring the liquid level in various containers, and can also measure the solid level or for distance measurement.
[0003] The existing mainstream ultrasonic level transmitter structure is as follows: Figure 1 As shown, it is composed of a shell 32 and an ultrasonic vibrator 31 installed in the shell. The vibrator is bonded to the shell through a matching layer 30, and an electronic unit 33 is placed inside the shell. There is a mounting thread 36 at the rear of the shell. The upper part of the shell is a level transmitter cover 34, and a signal cable 35 is led out from the cover. The ultrasonic vibrator 31 is a single ultrasonic transducer that combines transmission and reception. It can be a circular piezoelectric ceramic sheet or a sandwich transducer composed of front and rear electrodes and piezoelectric ceramic sheets. The ultrasonic level transmitter of this structure has a large height, usually more than 15 cm, and a large blind area, usually more than 20 cm. It is not suitable for installation and use in narrow spaces. There are also many installation and application occasions in narrow spaces. In these occasions, the installation space is limited, and the measurement blind area is required to be small to ensure that the liquid level value at a very close distance can be measured. At the same time, the beam angle is required to be small to avoid false echoes in narrow spaces and ensure reliable and stable measurements.
[0004] The cheap small ultrasonic ranging modules currently on the market are small in size but have poor performance. They either have a large diffusion angle (usually around 45°), or poor waterproofness, or have a small range and a large blind area. They are not suitable for use in harsh environments, such as industry, municipal pipe networks and other fields. Utility Model Content
[0005] Based on the above technical problem that the existing ultrasonic level transmitter is not suitable for installation and application in narrow space, a low-space ultrasonic level transmitter is provided, which can greatly reduce the height of the level transmitter and has excellent performance of small blind area and small diffusion angle, and ensures sufficient effective measurement range and good waterproof and sealing performance to meet the needs of level measurement in narrow space.
[0006] The technical means adopted by the utility model are as follows:
[0007] A short-space ultrasonic level transmitter comprises a housing, an electronic unit and two ultrasonic vibrators located inside the housing; one of the ultrasonic vibrators is used to transmit ultrasonic waves, the other ultrasonic vibrator is used to receive ultrasonic waves, and matching layers are respectively bonded to the bottoms of the two ultrasonic vibrators;
[0008] Two hollow fixed supports are arranged on the inner bottom surface of the shell, and the two ultrasonic vibrators and the corresponding matching layers are respectively installed inside the two fixed supports, and the two ultrasonic vibrators and the corresponding matching layers are kept relatively inclined; the distance between the inner cavities of the two fixed supports is smaller than the radius of the ultrasonic vibrators;
[0009] The matching layer is bonded or fixed to the corresponding inner wall of the fixed support by means of soft material.
[0010] Furthermore, a boss I is provided on the inner wall of one side of the fixed support close to the other fixed support, and a boss II is provided on the inner wall of the other side, the height of the boss I is higher than the boss II, and the two ends of the matching layer are respectively installed on the boss I and the boss II to maintain the inclination, thereby making the corresponding ultrasonic vibrator remain inclined in the fixed support.
[0011] Furthermore, the electronic unit is electrically connected to the two ultrasonic vibrators respectively and is horizontally placed above the two ultrasonic vibrators, and a signal cable of the electronic unit is led out from a side surface of the shell.
[0012] Furthermore, a mounting structure for mounting the level transmitter is provided at the bottom of the outer side surface of the shell, which may be a fixed through hole or a thread.
[0013] Furthermore, trumpet-shaped external holes are provided at the bottoms of the two fixed supports.
[0014] Furthermore, a metal shielding layer is provided on the side of the ultrasonic vibrator for receiving ultrasonic waves.
[0015] Furthermore, a damping material is adhered to the side or rear of the ultrasonic vibrator for emitting ultrasonic waves.
[0016] Furthermore, a damping material is adhered to the side or rear of the ultrasonic vibrator for receiving ultrasonic waves.
[0017] Furthermore, a sound absorbing material is arranged in the rear space of the ultrasonic vibrator for emitting ultrasonic waves.
[0018] Furthermore, the interior of the housing is completely sealed with glue.
[0019] Compared with the prior art, the utility model has the following advantages:
[0020] The low-space ultrasonic level transmitter provided by the utility model is provided with two ultrasonic vibrators. Since the two vibrators are not located on the same structure, when one vibrator emits ultrasonic waves to generate vibrations, the other vibrator is slightly affected by the vibration, so that the blind area of the level transmitter is very small; since the ultrasonic vibrator is bonded with a matching layer, ultrasonic waves can be efficiently emitted and received, and the sound wave beam angle is very small; since two ultrasonic vibrators are installed, the lateral space of the ultrasonic level transmitter is large, the electronic units can be placed in parallel, and the height of the level transmitter is effectively reduced.
[0021] Based on the above reasons, the utility model can be widely used in the field of level measurement, and is particularly suitable for application and installation requirements in narrow spaces. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0023] Figure 1 It is a schematic diagram of the structure of an ultrasonic level transmitter in the prior art.
[0024] Figure 2 This is a schematic diagram of the structure of the ultrasonic level transmitter of the utility model.
[0025] Figure 3 This is a schematic diagram of the installation structure of the ultrasonic level transmitter of the utility model.
[0026] Figure 4 This is a schematic diagram of the structure of the ultrasonic level transmitter described in Example 1 of the utility model.
[0027] In the figure: 3, 15, 32: shell; 5, 11, 17, 23: fixed support; 6, 8, 18, 20, 31: ultrasonic vibrator; 7, 9, 19, 21, 30: matching layer; 2, 14, 33: electronic unit; 22: silica gel; 1, 13, 34: shell cover; 12, 24, 35: signal cable; 4, mounting structure; 16, mounting through hole; 36, mounting thread. DETAILED DESCRIPTION
[0028] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0031] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0032] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.
[0035] like Figure 2 As shown, the utility model provides a short-space ultrasonic level transmitter, comprising a housing 3, an electronic unit 2 and two ultrasonic vibrators 6 and 8 located inside the housing 3; one of the ultrasonic vibrators 6 is used to transmit ultrasonic waves, and the other ultrasonic vibrator 8 is used to receive ultrasonic waves, and matching layers 7 and 9 are bonded to the bottoms of the two ultrasonic vibrators 6 and 8 respectively;
[0036] Two hollow fixed supports 5, 11 are arranged on the inner bottom surface of the shell 3, the two ultrasonic vibrators 6, 8 and the corresponding matching layers 7, 9 are respectively installed inside the two fixed supports 5, 11, and the two ultrasonic vibrators 6, 8 and the corresponding matching layers 7, 9 are kept relatively tilted (that is, the two ultrasonic vibrators 6, 8 are kept relatively tilted, and the two matching layers 7, 9 are also kept relatively tilted); the spacing between the inner cavities of the two fixed supports 5, 11 is smaller than the radius of the ultrasonic vibrators 6, 8; the matching layers 7, 9 are fixed to the inner walls of the corresponding fixed supports 5, 11 by bonding with soft materials.
[0037] Furthermore, the bottoms of the two fixed supports 5 and 11 are both provided with trumpet-shaped external holes for propagation of ultrasonic waves.
[0038] Furthermore, the housing 3 is provided with an openable and closable housing upper cover 1 .
[0039] Furthermore, the electronic unit 2 is electrically connected to the two ultrasonic vibrators 6 and 8 respectively, and is used to control the two ultrasonic vibrators 6 and 8 to emit and receive ultrasonic waves; the electronic unit 2 is electrically connected to the two ultrasonic vibrators 6 and 8 respectively, and is placed horizontally above the two ultrasonic vibrators 6 and 8; the signal cable 12 of the electronic unit 2 is led out from the side of the shell 3.
[0040] Furthermore, a boss I is provided on the inner wall of one side of the fixed support 5 (11) close to the other fixed support 11 (5), and a boss II is provided on the inner wall of the other side, wherein the height of the boss I is higher than that of the boss II, and the two ends of the matching layer 7 (9) are respectively mounted on the boss I and the boss II so as to maintain the inclination, thereby enabling the corresponding ultrasonic vibrator 6 (8) to maintain the inclination in the fixed support 5 (11), and at the same time enabling the two ultrasonic vibrators 6, 8 to maintain a relative inclination.
[0041] Furthermore, the bottom of the outer side of the housing 3 is provided with a mounting structure 4 for mounting the level transmitter, which may be a fixing through hole (such as a fixing through hole) for mounting a bolt. Figure 2 as shown) or thread (as Figure 3 shown).
[0042] Furthermore, a metal shielding layer is provided on the side of the ultrasonic vibrator 8 for receiving ultrasonic waves, and the metal shielding layer is installed on the inner side or the outer side of the fixing support 11 .
[0043] Furthermore, a damping material is adhered to the side or rear of the ultrasonic vibrator 6 for emitting ultrasonic waves.
[0044] Furthermore, a damping material is adhered to the side or rear of the ultrasonic vibrator 8 for receiving ultrasonic waves.
[0045] Furthermore, a sound absorbing material is arranged in the rear space of the ultrasonic vibrator 6 for emitting ultrasonic waves.
[0046] Furthermore, in order to maintain the accuracy of distance measurement, a temperature sensor is installed inside the housing 3 to measure the ambient temperature and correct the speed of the sound wave.
[0047] Furthermore, the interior of the housing 3 is completely sealed with glue.
[0048] Since the beam angles of the two ultrasonic vibrators are small, when measuring a very close distance, if they are placed normally in parallel, when the sound wave signal emitted by one vibrator, the reflected sound wave signal received by the other vibrator will be very weak and cannot be reliably detected, which will cause measurement failure or measurement errors. However, the present application places the two ultrasonic vibrators at a relative angle, so that the signal received by the vibrator receiving the ultrasound wave will be strong enough to ensure reliable and stable measurement.
[0049] Since the two ultrasonic vibrators are installed on different fixed supports, the vibration generated by the transmitting ultrasonic vibrator when emitting sound waves has little effect on the receiving ultrasonic vibrator. The receiving ultrasonic vibrator is subject to very little residual vibration and can receive the echo quickly, thereby making the detection blind area of the sensor very small.
[0050] The two ultrasonic vibrators are bonded with a matching layer, which makes the efficiency of sound wave emission and reception very high and the sound wave beam angle very low. At the same time, the fixed support is provided with a horn-shaped external hole, which is also conducive to the effective propagation of ultrasonic waves.
[0051] Since the electronic unit is placed horizontally and the signal cable connected to the electronic unit is led out from the side of the level transmitter housing, the overall height of the level transmitter is greatly reduced.
[0052] The ultrasonic level transmitter provided by the utility model is very suitable for the need of level measurement in a narrow space.
[0053] Example 1
[0054] like Figure 4 As shown, based on the above technical solution, the short-space ultrasonic level transmitter provided in this embodiment includes a housing 15 and an electronic unit 14 and two ultrasonic vibrators 18 and 20 located inside the housing 15;
[0055] The ultrasonic vibrators 18 and 20 are circular ultrasonic transducers with a diameter of 16 mm and a thickness of 3 mm. The ultrasonic vibrator 18 is used to transmit ultrasonic waves, and the ultrasonic vibrator 20 is used to receive echoes.
[0056] When the housing 15 is placed vertically, the ultrasonic vibrators 18 and 20 are distributed left and right;
[0057] The ultrasonic vibrator 18 is bonded with a matching layer 19, and the outer side of the matching layer 19 is bonded to the inner wall of the bottom fixed support 17 of the shell 15 through silicone. The ultrasonic vibrator 20 is bonded with a matching layer 21, and the outer side of the matching layer 21 is bonded to the inner wall of the bottom fixed support 23 of the shell 15 through silicone 22. The ultrasonic vibrator 18 and the ultrasonic vibrator 20 are kept relatively tilted, and the two matching layers 19 and 21 are also kept relatively tilted, and the angle between the planes where the surfaces of the two matching layers 19 and 21 are located is 176°.
[0058] Furthermore, the housing 15 is provided with an openable and closable housing upper cover 13 .
[0059] Furthermore, the housing 15 is cylindrical, with a diameter of 6.5 cm and a height of 3.5 cm.
[0060] Furthermore, the spacing between the inner cavities of the fixing supports 17 and 23 is 3 mm.
[0061] Furthermore, the electronic unit 14 is used to control the two ultrasonic vibrators to transmit ultrasonic waves and receive echoes, and the signal cable 24 is led outward from the side of the shell 15.
[0062] Furthermore, a mounting through hole 16 for mounting the level transmitter is provided at the bottom of the outer side surface of the housing 15 .
[0063] Furthermore, a metal shielding layer is disposed on the side of the ultrasonic vibrator 20 , and the metal shielding layer is located inside the fixing support 23 .
[0064] Furthermore, the damping material is adhered to the side or rear of the ultrasonic vibrators 18 and 20 , and the damping material may be a soft polyurethane potting glue.
[0065] Furthermore, a sound absorbing material is arranged in the rear space of the ultrasonic vibrator 18 .
[0066] Furthermore, a temperature sensor is installed inside the housing 15 to measure the ambient temperature and correct the speed of the sound wave.
[0067] Furthermore, the interior of the housing 15 is completely potted with soft polyurethane.
[0068] The low-space ultrasonic level transmitter described in this embodiment has a total height of 3.8 cm, which is very suitable for installation in narrow spaces. At the same time, it has excellent acoustic performance, a measurement range of up to 4 m, a blind area of only 3 cm, an acoustic beam angle of 8° (3 db), and a level measurement accuracy of 0.6 cm; while an ordinary 4 m range ultrasonic level transmitter has a height of more than 10 cm, a blind area of at least 20 cm, a diffusion angle of usually 12° (3 db), and a measurement accuracy of 1 cm.
[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.
Claims
1. A low-space ultrasonic level transmitter, characterized in that: It comprises a shell, an electronic unit and two ultrasonic vibrators located inside the shell; one of the ultrasonic vibrators is used to transmit ultrasonic waves, and the other ultrasonic vibrator is used to receive ultrasonic waves, and matching layers are respectively bonded to the bottoms of the two ultrasonic vibrators; Two hollow fixed supports are arranged on the inner bottom surface of the shell, and the two ultrasonic vibrators and the corresponding matching layers are respectively installed inside the two fixed supports, and the two ultrasonic vibrators and the corresponding matching layers are kept relatively inclined; the distance between the inner cavities of the two fixed supports is smaller than the radius of the ultrasonic vibrators; The matching layer is bonded or fixed to the corresponding inner wall of the fixed support by means of soft material.
2. The short-space ultrasonic level transmitter according to claim 1 is characterized in that: A boss I is arranged on the inner wall of one side of the fixed support close to the other fixed support, and a boss II is arranged on the inner wall of the other side. The height of the boss I is higher than that of the boss II. The two ends of the matching layer are respectively installed on the boss I and the boss II to keep the inclination, thereby making the corresponding ultrasonic vibrator keep inclination in the fixed support.
3. The short-space ultrasonic level transmitter according to claim 1 is characterized in that: The electronic unit is electrically connected to the two ultrasonic vibrators respectively and is horizontally placed above the two ultrasonic vibrators. The signal cable of the electronic unit is led out from the side of the shell.
4. The short-space ultrasonic level transmitter according to claim 1 is characterized in that: A mounting structure for mounting the level transmitter is arranged at the bottom of the outer side surface of the shell.
5. The short-space ultrasonic level transmitter according to claim 1 is characterized in that: The bottoms of the two fixed supports are both provided with trumpet-shaped external holes.
6. The short-space ultrasonic level transmitter according to claim 1 is characterized in that: A metal shielding layer is provided on the side surface of the ultrasonic vibrator for receiving ultrasonic waves.
7. The short-space ultrasonic level transmitter according to claim 1 is characterized in that: A damping material is adhered to the side or rear of the ultrasonic vibrator for emitting ultrasonic waves.
8. The short-space ultrasonic level transmitter according to claim 1 is characterized in that: A damping material is adhered to the side or rear of the ultrasonic vibrator for receiving ultrasonic waves.
9. The short-space ultrasonic level transmitter according to claim 1 is characterized in that: A sound absorbing material is arranged in the rear space of the ultrasonic vibrator for emitting ultrasonic waves.
10. The short-space ultrasonic level transmitter according to claim 1, characterized in that: The interior of the housing is completely sealed with glue.