Keyboard and front shell structure assembly for protecting liquid crystal through overall glue pouring of prepayment meter

Abstract

The utility model discloses a keyboard and front shell structure assembly for protecting liquid crystal through overall glue pouring of a prepayment meter, and relates to the technical field of keyboard type prepayment meters, the keyboard and front shell structure assembly comprises a front shell and a flexible keyboard, the front shell is provided with keyboard holes and rectangular through grooves, keys of the flexible keyboard extend out of the keyboard holes, and the keys of the flexible keyboard are arranged corresponding to keys of a circuit board. The rectangular through groove is arranged corresponding to a liquid crystal screen of the circuit board, a first annular boss is arranged on the periphery of the rectangular through groove, the first annular boss is used for covering the periphery of the liquid crystal screen of the circuit board, and sealant is poured into an inner cavity of the front shell; according to the utility model, the sealant blocks dust and moisture from entering a channel in the front shell from the keyboard hole through a glue filling mode, the waterproof and dustproof effects are improved, and meanwhile, the first annular boss can cover the periphery of the liquid crystal screen of the circuit board from the front shell, so that the sealant is prevented from flowing to the liquid crystal screen, and the problem that the normal watching of the liquid crystal screen is influenced is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of keyboard type prepayment meters, in particular to a keyboard and front shell structure assembly for overall potting protection of a liquid crystal in a prepayment meter. Background Art

[0002] At present, with the use of intelligent water and gas meters at home and abroad, especially due to geographical differences abroad, the installation environment is poor, and the protection requirements for the meters are getting higher and higher. Traditional keyboard type prepayment meters cannot ensure the normal use of internal electronic devices in harsh environments. The specific reasons are as follows: Dust and moisture in the harsh environment will enter the interior of the keyboard type prepayment meter through gaps, thus affecting the electronic devices; Since keyboard holes need to be provided at the front shell of the keyboard type prepayment meter for the keys to protrude, the front shell is the main channel for dust and moisture to enter the interior of the keyboard type prepayment meter. Currently, common keyboard type prepayment meters do not perform waterproof and dustproof treatment on this position.

[0003] Therefore, people urgently need a keyboard and front shell structure assembly for overall potting protection of a liquid crystal in a prepayment meter with good waterproof and dustproof effects and without affecting the external viewing of the liquid crystal screen. Summary of the Invention

[0004] The purpose of the utility model is to provide a keyboard and front shell structure assembly for overall potting protection of a liquid crystal in a prepayment meter to solve the problems existing in the above-mentioned prior art. The gaps are sealed by potting to improve the waterproof and dustproof effects. At the same time, the liquid crystal screen is protected by the first annular boss to prevent the potting from affecting the normal viewing of the liquid crystal screen.

[0005] To achieve the above purpose, the utility model provides the following solution: The utility model provides a keyboard and front shell structure assembly for overall potting protection of a liquid crystal in a prepayment meter, including a front shell and a flexible keyboard. The front shell is provided with a keyboard hole and a rectangular through groove for the keys of the flexible keyboard to protrude. The keys of the flexible keyboard are arranged corresponding to the keys of the circuit board, and the rectangular through groove is arranged corresponding to the liquid crystal screen of the circuit board. A first annular boss is arranged around the rectangular through groove, and the first annular boss is used to cover the periphery of the liquid crystal screen of the circuit board. A sealing glue is poured into the inner cavity of the front shell.

[0006] Preferably, a transparent window is fixed to the rectangular through groove.

[0007] Preferably, the transparent window is hermetically connected to the rectangular through groove.

[0008] Preferably, the flexible keyboard is made of silica gel.

[0009] Preferably, a flexible annular sealing ring is provided on the flexible keyboard. One end of the annular sealing ring covers the periphery of the liquid crystal screen of the circuit board, and the other end is sleeved on the outer peripheral wall of the first annular boss.

[0010] Preferably, the annular sealing ring is integrally formed with the flexible keyboard.

[0011] Preferably, the flexible keyboard includes a base and the keys. A plurality of the keys are provided on the base, and a plurality of keyboard holes corresponding to the keys respectively are formed on the front shell.

[0012] Preferably, a second annular boss is provided at one end of the keyboard hole close to the flexible keyboard. The base of the flexible keyboard abuts against the second annular boss, and the second annular boss is sleeved around the keys.

[0013] Preferably, a third annular boss is provided at one end of the front shell close to the flexible keyboard. The third annular boss is arranged around the second annular boss and corresponds to the base.

[0014] Preferably, screw posts for bolt connection with the circuit board are provided on the front shell.

[0015] The present utility model mainly achieves the following technical effects compared with the prior art:

[0016] By means of potting, the sealant blocks the channels for dust and moisture to enter the interior of the front shell from the keyboard holes, improving the waterproof and dustproof effects. At the same time, the first annular boss can cover the periphery of the liquid crystal screen of the circuit board from the front shell, blocking the sealant from flowing towards the liquid crystal screen and avoiding the problem of affecting the normal viewing of the liquid crystal screen.

[0017] Other solutions of the present utility model achieve the following technical effects compared with the prior art:

[0018] The sealed setting of the transparent window blocks the channels for dust and moisture to enter the interior of the front shell from the rectangular through groove, further improving the waterproof and dustproof effects.

[0019] The annular sealing ring is tightly sleeved on the first annular boss, and the part of the annular sealing ring in contact with the circuit board can be deformed and extruded on the circuit board to block the gap between the first annular boss and the circuit board, further improving the protection effect on the liquid crystal screen.

[0020] The settings of the second annular boss and the third annular boss can further utilize the deformable characteristics of the flexible keyboard to achieve effective sealing and improve the waterproof and dustproof effects. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is an exploded view of the keyboard and front shell structure assembly for overall potting protection of the liquid crystal in the embodiment of the present invention from the first perspective;

[0023] Figure 2 This is an exploded view of the keyboard and front shell structure assembly for overall potting protection of the liquid crystal in the embodiment of the present invention from the second perspective;

[0024] Among them, 1. Front shell; 2. Flexible keyboard; 3. Rectangular through groove; 4. Button; 5. Substrate; 6. First annular boss; 7. Transparent window; 8. Liquid crystal screen; 9. Annular sealing ring; 10. Second annular boss; 11. Third annular boss; 12. Keyboard hole; 13. Screw post; 14. Circuit board. Detailed implementation manners

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a keyboard and front shell structure assembly for overall potting protection of the liquid crystal in a prepayment meter, to solve the problems existing in the prior art, realize the sealing of gaps by potting, improve the waterproof and dustproof effects, and at the same time use the first annular boss to protect the liquid crystal screen to prevent the potting from affecting the normal viewing of the liquid crystal screen.

[0027] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0028] Please refer to Figure 1 , Figure 2As shown in the figure, a keyboard and front shell structure component for overall potting protection of a prepaid meter's liquid crystal is provided, including a front shell 1 and a flexible keyboard 2. The front shell 1 is provided with a keyboard hole 12 for the keys 4 of the flexible keyboard 2 to protrude and a rectangular through groove 3. Since generally multiple keys 4 are provided on the flexible keyboard 2, in this embodiment, a number of keyboard holes 12 corresponding to the keys 4 are provided on the front shell 1, and the keyboard holes 12 and the keys 4 are arranged in a one-to-one manner. In another embodiment, one keyboard hole 12 can be provided corresponding to multiple keys 4; the keys 4 of the flexible keyboard 2 are arranged corresponding to the keys of the circuit board 14, and the rectangular through groove 3 is arranged corresponding to the liquid crystal screen 8 of the circuit board 14. A first annular boss 6 is provided around the rectangular through groove 3, and the first annular boss 6 is used to cover around the liquid crystal screen 8 of the circuit board 14. A sealant is poured into the inner cavity of the front shell 1. The sealant can be selected as AB glue. By the potting method, the sealant blocks the channels for dust and moisture to enter the interior of the front shell 1 from the keyboard holes 12, improving the waterproof and dustproof effect. At the same time, the first annular boss 6 can cover around the liquid crystal screen 8 of the circuit board 14 from the front shell 1, blocking the sealant from flowing towards the liquid crystal screen 8 and avoiding the problem of affecting the normal viewing of the liquid crystal screen 8.

[0029] A transparent window 7 is fixed in the rectangular through groove 3 to protect the liquid crystal screen 8.

[0030] On the basis of setting the transparent window 7, the transparent window 7 is hermetically connected to the rectangular through groove 3. The hermetic connection method can be to seal with a sealant or to seal by ultrasonic welding. The hermetic setting of the transparent window 7 blocks the channels for dust and moisture to enter the interior of the front shell 1 from the rectangular through groove 3, further improving the waterproof and dustproof effect.

[0031] In this embodiment, the material of the flexible keyboard 2 is silicone. In another embodiment, the material of the flexible keyboard 2 can be nitrile rubber, etc.

[0032] A flexible annular sealing ring 9 is provided on the flexible keyboard 2. One end of the annular sealing ring 9 covers around the liquid crystal screen 8 of the circuit board 14, and the other end is sleeved on the outer peripheral wall of the first annular boss 6. The annular sealing ring 9 is tightly sleeved on the first annular boss 6. And when the circuit board 14 is installed on the front shell 1 by bolts, the part of the annular sealing ring 9 in contact with the circuit board 14 will be deformed and extruded on the circuit board 14 to block the gap between the first annular boss 6 and the circuit board 14, further improving the protection effect on the liquid crystal screen 8.

[0033] In this embodiment, the annular sealing ring 9 has the same material as the flexible keyboard 2 and is integrally formed.

[0034] The flexible keyboard 2 includes a base 5 and keys 4, and a number of keys 4 are provided on the base 5.

[0035] In this embodiment, a second annular boss 10 is provided at one end of the keyboard hole 12 close to the flexible keyboard 2. The base 5 of the flexible keyboard 2 abuts against the second annular boss 10, and the second annular boss 10 is sleeved around the keys 4. A third annular boss 11 is provided at one end of the front shell 1 close to the flexible keyboard 2. The third annular boss 11 is arranged around the second annular boss 10. It can be set that the third annular boss 11 is arranged around all the second annular bosses 10, and the third annular boss 11 corresponds to the base 5.

[0036] The arrangements of the second annular boss 10 and the third annular boss 11 can further utilize the deformable characteristics of the flexible keyboard 2 to achieve effective sealing and improve the waterproof and dustproof effects.

[0037] Screw posts 13 for bolt connection with the circuit board 14 are provided on the front shell 1. Through holes are provided at positions on the circuit board 14 corresponding to the screw posts 13. Bolts pass through the through holes and are threadedly connected with the screw posts 13 to install the circuit board 14 on the front shell 1. When installing the circuit board 14, the circuit board 14 can be made to abut against the flexible keyboard 2 by screwing the bolts. The front shell 1 and the circuit board 14 jointly squeeze the flexible keyboard 2 to realize the deformation of the flexible keyboard 2, thereby improving the sealing effect by utilizing the deformation of the flexible keyboard 2.

[0038] Adaptations made according to actual needs are all within the protection scope of the present utility model.

[0039] It should be noted that for those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0040] Specific examples are applied in the present utility model to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A keyboard and front shell structure component for a prepaid meter with overall potting protection for the liquid crystal, characterized in that, It includes a front shell and a flexible keyboard. A keyboard hole and a rectangular through slot for the keys of the flexible keyboard to protrude are provided on the front shell. The keys of the flexible keyboard are arranged corresponding to the keys of the circuit board, and the rectangular through slot is arranged corresponding to the liquid crystal screen of the circuit board. A first annular boss is provided around the rectangular through slot, and the first annular boss is used to cover the periphery of the liquid crystal screen of the circuit board. Sealant is poured into the inner cavity of the front shell.

2. The keyboard and front shell structure assembly for overall potting protection of liquid crystal of the prepaid meter according to claim 1, wherein, A transparent window is fixed to the rectangular through slot.

3. The keyboard and front shell structure assembly for protecting the liquid crystal by overall potting of the prepaid meter according to claim 2, characterized in that, The transparent window is hermetically connected to the rectangular through slot.

4. The keyboard and front shell structure assembly for overall potting protection of liquid crystal of the prepayment meter according to claim 1, characterized in that, The flexible keyboard is made of silicone.

5. The keyboard and front shell structure assembly for overall potting protection of liquid crystal of the prepayment meter according to claim 1, characterized in that, A flexible annular sealing ring is provided on the flexible keyboard. One end of the annular sealing ring covers the periphery of the liquid crystal screen of the circuit board, and the other end is sleeved on the outer peripheral wall of the first annular boss.

6. The keyboard and front shell structure component for overall potting protection of liquid crystal in the prepaid meter according to claim 5, characterized in that, The annular sealing ring is integrally formed with the flexible keyboard.

7. The keyboard and front shell structure assembly for overall potting protection of liquid crystal in the prepaid meter according to claim 1, characterized in that, The flexible keyboard includes a base and the keys. A plurality of the keys are provided on the base, and a plurality of keyboard holes corresponding to the keys respectively are provided on the front shell.

8. The keyboard and front shell structure assembly for overall potting protection of liquid crystal of the prepaid meter according to claim 7, characterized in that, A second annular boss is provided at one end of the keyboard hole close to the flexible keyboard. The base of the flexible keyboard abuts against the second annular boss, and the second annular boss is sleeved around the key.

9. The keyboard and front shell structure assembly for overall potting protection of liquid crystal in a prepaid meter according to claim 8, characterized in that, A third annular boss is provided at one end of the front shell close to the flexible keyboard. The third annular boss is arranged around the second annular boss and corresponds to the base.

10. The keyboard and front shell structure assembly for protecting liquid crystal by integral potting of the prepayment meter according to claim 1, characterized in that, Screw posts for bolt connection with the circuit board are provided on the front shell.

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