Circuit board module and ultrasonic water meter

Abstract

The utility model belongs to ultrasonic water gauge technical field discloses a kind of circuit board module and ultrasonic water gauge.The circuit board module includes glue filling box, circuit board, liquid crystal screen and liquid crystal support. Among them, liquid crystal support sealing connection is at the bottom of glue filling box, and form airtight space between with the bottom of glue filling box, liquid crystal screen is set in airtight space, circuit board is set in glue filling box and located the side of liquid crystal support far from liquid crystal screen.Good at liquid crystal screen is equipped with connecting pin foot, and liquid crystal support is provided with connecting convex part towards circuit board, connecting pin foot is arranged in connecting convex part and is connected with circuit board, to realize the electric connection of liquid crystal screen and liquid crystal support, and connecting pin foot is connected with circuit board by connecting convex part, increase the arrangement path of connecting pin foot in liquid crystal support, so that even when filling, filling glue flows into airtight space by connecting pin foot, due to the additional connecting convex part, increase flow path, to effectively prevent filling glue from polluting liquid crystal screen.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic water meter technology, and in particular to a circuit board module and an ultrasonic water meter. Background Technology

[0002] Generally, ultrasonic water meters are installed in complex environments and require high levels of protection. Therefore, most ultrasonic water meters use a fully potting method for their circuit boards.

[0003] Currently, the circuit board module of ultrasonic water meters includes a potting box, a circuit board, and an LCD module. The main control board is fixed inside the potting box, which is filled with potting compound. The potting compound at least covers the conductive components on the circuit board. The LCD module is mounted on the circuit board and requires separate adhesive protection to prevent the compound from contaminating the LCD module and affecting its use. However, most operating methods fill the gap between the display window and the front of the LCD with sealing foam. Except for the front display area, the other parts of the LCD are still wrapped in the compound. The potting compound will generate stress under hot and cold conditions, which will affect the LCD display.

[0004] Therefore, there is an urgent need for a circuit board module and an ultrasonic water meter to solve the above-mentioned technical problems. Utility Model Content

[0005] One objective of this invention is to provide a circuit board module that can effectively reduce the contamination of the LCD screen by the potting compound, thereby avoiding the stress generated by the potting compound under hot and cold conditions that could affect the LCD display, and improving the reliability and service life of the LCD screen.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The circuit board module includes a potting box, a circuit board, an LCD screen, and an LCD bracket; the LCD bracket is sealed to the bottom of the potting box and forms a sealed space between the liquid crystal bracket and the bottom of the potting box; the LCD screen is disposed in the sealed space; and the circuit board is potted and disposed in the potting box and located on the side of the LCD bracket away from the LCD screen.

[0008] The aforementioned LCD screen is provided with connecting pins, and the aforementioned LCD bracket has a connecting protrusion protruding towards the aforementioned circuit board. The aforementioned connecting pins pass through the aforementioned connecting protrusion and are connected to the aforementioned circuit board.

[0009] Optionally, a gap is provided between the connecting protrusion and the circuit board.

[0010] Optionally, the connecting protrusion is provided with a connecting hole for the connecting pin to pass through.

[0011] Optionally, the connection hole includes a straight segment and a gradually expanding segment, the straight segment being disposed close to the circuit board; the gradually expanding segment being connected to the straight segment and disposed close to the LCD screen.

[0012] Optionally, the aforementioned LCD bracket further includes multiple feet connected to the aforementioned circuit board.

[0013] Optionally, at least one of the aforementioned legs is provided with an insertion protrusion, the circuit board is provided with an insertion hole, and the insertion protrusion is inserted into the insertion hole.

[0014] Optionally, it also includes a sealing element disposed between the edge of the liquid crystal bracket and the bottom of the potting box, the sealing element being used for sealing the liquid crystal bracket and the bottom of the potting box.

[0015] Optionally, it also includes a buffer structure, which is filled between the LCD screen and the LCD bracket.

[0016] Optionally, the potting box is provided with a plurality of auxiliary support feet, each of which includes a residual portion and a portion to be removed. The residual portion is connected to the potting box, and the portion to be removed is connected to the end of the residual portion away from the potting box. The end face of the portion to be removed away from the residual portion is flush with the outer bottom surface of the potting box. The portion to be removed can be removed after the circuit board potting is completed.

[0017] Another objective of this invention is to provide an ultrasonic water meter, including the aforementioned circuit board module.

[0018] The beneficial effects of this utility model are:

[0019] This invention provides a circuit board module and an ultrasonic water meter. A liquid crystal support is sealed to the bottom of the potting box, creating a closed space between the support and the bottom of the potting box for mounting the liquid crystal screen. The circuit board is positioned on the other side of the support, achieving spatial isolation between the liquid crystal screen and the circuit board. The liquid crystal screen and the circuit board are connected by pins. An additional connecting protrusion is added to the portion of the pins that passes through the support, increasing the pin's penetration path. This means that when potting compound is applied to the circuit board, even if some compound flows into the closed space through the pins, the added protrusion increases the flow path and resistance, slowing down the flow and reducing the amount of compound entering the closed space. This effectively reduces compound contamination of the liquid crystal screen and prevents stress from the compound under hot and cold conditions, thus improving the reliability and lifespan of the liquid crystal screen. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the circuit board module without potting according to a specific embodiment of this utility model;

[0021] Figure 2 This is a cross-sectional view of the circuit board module after potting according to a specific embodiment of this utility model;

[0022] Figure 3 This is an isometric view of the unsealed potting box provided in a specific embodiment of this utility model;

[0023] Figure 4 This is an isometric view of the potting box after potting according to a specific embodiment of this utility model;

[0024] Figure 5 This is an isometric view of the LCD bracket provided in a specific embodiment of this utility model.

[0025] In the picture:

[0026] 10. Glue box; 111. Residue area; 112. Area to be removed;

[0027] 20. Circuit board;

[0028] 30. LCD screen; 31. Connecting pins;

[0029] 40. LCD bracket; 41. Connecting protrusion; 411. Connecting hole; 4111. Straight section; 4112. Gradually expanding section; 42. Support leg; 421. Insertion protrusion;

[0030] 50. Seals; 60. Buffer structure; 70. Potting compound;

[0031] 101. Enclosed space. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] This embodiment provides a circuit board module, which is installed in an ultrasonic water meter, and helps to reduce the damage caused by the contamination of the LCD screen 30 by the potting compound 70.

[0037] Please refer to Figure 1 and Figure 2 Specifically, the circuit board module includes a potting box 10, a circuit board 20, an LCD screen 30, and an LCD bracket 40. The LCD bracket 40 is sealed to the bottom of the potting box 10, forming a sealed space 101 between the bracket and the bottom of the potting box 10. The LCD screen 30 is disposed within the sealed space 101. The circuit board 20 is potted and disposed within the potting box 10 and located on the side of the LCD bracket 40 away from the LCD screen 30, thus providing adhesive protection for the LCD screen 30. The LCD screen 30 is provided with connecting pins 31, and the LCD bracket 40 is provided with connecting protrusions 41 protruding towards the circuit board 20. The connecting pins 31 pass through the connecting protrusions 41 and are connected to the circuit board 20, thereby realizing the electrical connection between the LCD screen 30 and the LCD bracket 40. The connecting pins 31 are connected to the circuit board 20 through the connecting protrusions 41, which increases the path of the connecting pins 31 through the LCD bracket 40. Therefore, even if potting compound 70 flows into the sealed space 101 through the connecting pins 31 during potting, the addition of the connecting protrusions 41 increases the flow path, thereby effectively preventing the potting compound 70 from contaminating the LCD screen 30.

[0038] In this embodiment, the circuit board module is sealed with a liquid crystal bracket 40 at the bottom of the potting box 10, so that a sealed space 101 for mounting the liquid crystal screen 30 is formed between the liquid crystal bracket 40 and the bottom of the potting box 10, and the circuit board 20 is placed on the other side of the liquid crystal bracket 40, thereby achieving spatial isolation between the liquid crystal screen 30 and the circuit board 20. The LCD screen 30 and the circuit board 20 are connected by connecting pins 31. An additional connecting protrusion 41 is added to the portion of the connecting pins 31 that passes through the LCD bracket 40, thereby increasing the passage path of the connecting pins 31. This means that when the circuit board 20 is encapsulated with potting compound 70, even if some potting compound 70 flows into the sealed space 101 through the connecting pins 31, the added connecting protrusion 41 increases the flow path of the potting compound 70, increases the resistance of the potting compound 70, slows down the flow of the potting compound 70, and reduces the amount of potting compound 70 entering the sealed space 101. This effectively reduces the contamination of the LCD screen 30 by the potting compound 70, avoids stress caused by the potting compound 70 under hot and cold conditions affecting the LCD display, and thus improves the reliability and lifespan of the LCD screen 30.

[0039] Please refer to Figures 1 to 4 Specifically, the potting box 10 is used to hold the circuit board 20, the LCD screen 30 and the LCD bracket 40. After the above structure is installed in the potting box 10, the potting glue 70 is applied to form the circuit board module. Then the circuit board module can be installed with the housing of the ultrasonic water meter.

[0040] Due to the layout of the internal components of the potting box 10 and the layout of the various structures inside the ultrasonic water meter, the potting box 10 generally cannot be laid flat. This will result in the inability to ensure a flat surface of the adhesive or complete encapsulation of some electronic components when potting with the potting adhesive 70. Even if they can be encapsulated, the sealing height needs to be increased, which not only increases the cost of the adhesive but also makes it difficult to control the amount of adhesive. If additional tooling is used to assist in potting, not only will a large number of tooling tools be required, but the operation will also be inconvenient.

[0041] Therefore, optionally, the potting box 10 is provided with several auxiliary support feet, each including a residual portion 111 and a portion to be removed 112. The residual portion 111 is connected to the potting box 10, and the portion to be removed 112 is connected to the end of the residual portion 111 away from the potting box 10. The end face of the portion to be removed 112 away from the residual portion 111 is flush with the outer bottom surface of the potting box 10. The portion to be removed 112 can be removed after the circuit board 20 is potted. This allows the potting box 10 to be removed before the circuit board 20 is potted. Figure 1 and Figure 3 As shown, because it contains the part to be removed 112, the potting box 10 can be placed flat, thereby ensuring that the surface of the potting compound 70 is flat and completely encapsulates the electronic components. Furthermore, when potting and installing the circuit board 20, as... Figure 2 and Figure 4 As shown, the operator can remove the part 112 to be removed by hot shearing, thereby ensuring that the glue box 10 will not interfere with the assembly of other structures.

[0042] Specifically, the circuit board 20 is equipped with several electronic devices to provide corresponding control and monitoring functions.

[0043] The LCD screen 30, as a display device, is mainly used to receive relevant signals and transmit them to the LCD screen 30 for display after the ultrasonic water meter carrying the circuit board module detects the water flow.

[0044] Please refer to Figure 1 , Figure 2 and Figure 5 Specifically, a gap is provided between the connecting protrusion 41 on the aforementioned LCD bracket 40 and the circuit board 20. This arrangement ensures that even if the potting compound 70 flows down from the circuit board 20, there is still other space for flow, allowing most of the potting compound 70 to flow into the space between the LCD bracket 40 and the circuit board 20, thereby reducing the amount of potting compound 70 flowing into the LCD screen 30 through the connecting pin 31.

[0045] Specifically, the connecting protrusion 41 has a connecting hole 411 for the connection pin 31 to pass through. Optionally, the opening area of ​​the connecting hole 411 is small, making it slightly larger than the cross-sectional area of ​​the connection pin 31. This arrangement can effectively reduce the amount of potting compound 70 entering the sealed space 101.

[0046] More specifically, the connecting hole 411 includes a straight segment 4111 and a gradually expanding segment 4112. The straight segment 4111 is located near the circuit board 20; the gradually expanding segment 4112 connects to the straight segment 4111 and is located near the LCD screen 30. The straight segment 4111 increases the path of the connecting hole 4111, which has a small opening area, thereby causing the potting compound 70 to flow slowly and in small quantities when flowing through the straight segment 4111. That is, the flow of the potting compound 70 is obstructed, so that most of the potting compound 70 flows into the space between the LCD bracket 40 and the circuit board 20, reducing the amount of potting compound 70 flowing into the sealed space 101.

[0047] Specifically, the LCD bracket 40 also includes multiple legs 42, which are connected to the circuit board 20 to support the circuit board 20 and enable the circuit board 20 to be installed, so that the circuit board 20 can be positioned before potting.

[0048] More specifically, at least one of the multiple legs 42 is provided with an insertion protrusion 421, and the circuit board 20 is provided with an insertion hole. The insertion protrusion 421 is inserted into the insertion hole, which can realize the connection between the liquid crystal bracket 40 and the circuit board 20, and further realize the positioning function of the circuit board 20.

[0049] Please return to the reference. Figure 1 and Figure 2 Furthermore, the circuit board module also includes a sealing element 50, which is disposed between the edge of the liquid crystal bracket 40 and the bottom of the potting box 10. The sealing element 50 is used for sealing the liquid crystal bracket 40 and the bottom of the potting box 10 to ensure the formation of the sealed space 101, thereby achieving the effect of separating the liquid crystal screen 30 from the glue.

[0050] Since the potting compound 70 will generate stress under hot and cold conditions, the circuit board module further includes a buffer structure 60, which is filled between the LCD screen 30 and the LCD bracket 40 to buffer the LCD screen 30, thereby coping with the damage caused by stress and strain and further improving the protection of the LCD screen 30.

[0051] This embodiment also provides an ultrasonic water meter, which includes the circuit board module described in any of the above solutions. By using this circuit board module, the LCD screen 30 is better protected and easier to pot, thereby improving the reliability and service life of the ultrasonic water meter.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A circuit board module, characterized in that, The system includes a potting box (10), a circuit board (20), a liquid crystal display (30), and a liquid crystal support (40). The liquid crystal support (40) is sealed to the bottom of the potting box (10) and forms a sealed space (101) between the support and the bottom of the potting box (10). The liquid crystal display (30) is disposed in the sealed space (101). The circuit board (20) is potted and disposed in the potting box (10) and is located on the side of the liquid crystal support (40) away from the liquid crystal display (30). The LCD screen (30) is provided with connecting pins (31), and the LCD bracket (40) is provided with connecting protrusions (41) facing the circuit board (20). The connecting pins (31) pass through the connecting protrusions (41) and are connected to the circuit board (20).

2. The circuit board module according to claim 1, characterized in that, A gap is provided between the connecting protrusion (41) and the circuit board (20).

3. The circuit board module according to claim 1, characterized in that, The connecting protrusion (41) has a connecting hole (411) for the connecting pin (31) to pass through.

4. The circuit board module according to claim 3, characterized in that, The connection hole (411) includes a straight segment (4111) and a gradually expanding segment (4112). The straight segment (4111) is located close to the circuit board (20). The gradually expanding segment (4112) is connected to the straight segment (4111) and located close to the LCD screen (30).

5. The circuit board module according to claim 1, characterized in that, The liquid crystal support (40) also includes a plurality of feet (42), which are connected to the circuit board (20).

6. The circuit board module according to claim 5, characterized in that, At least one of the plurality of legs (42) is provided with an insertion protrusion (421), the circuit board (20) is provided with an insertion hole, and the insertion protrusion (421) is inserted into the insertion hole.

7. The circuit board module according to claim 1, characterized in that, It also includes a sealing element (50), which is disposed between the edge of the liquid crystal support (40) and the bottom of the potting box (10), and the sealing element (50) is used for sealing connection between the liquid crystal support (40) and the bottom of the potting box (10).

8. The circuit board module according to claim 1, characterized in that, It also includes a buffer structure (60) that fills the space between the liquid crystal screen (30) and the liquid crystal support (40).

9. The circuit board module according to any one of claims 1-8, characterized in that, The potting box (10) is provided with a plurality of auxiliary support feet, each of which includes a residual part (111) and a part to be removed (112). The residual part (111) is connected to the potting box (10), and the part to be removed (112) is connected to the end of the residual part (111) away from the potting box (10). The end face of the part to be removed (112) away from the residual part (111) is flush with the outer bottom surface of the potting box (10). The part to be removed (112) can be removed after the circuit board (20) is potted.

10. An ultrasonic water meter, characterized in that, Includes the circuit board module as described in any one of claims 1-9.

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