Electromagnetic buzzer

Abstract

The utility model relates to an electromagnetic buzzer which comprises an iron core column and a coil, a core sleeve is arranged between the iron core column and the coil, the cross section of the core sleeve is I-shaped, the middle section of the core sleeve is sleeved on the outer side of the iron core column, and the upper side and the lower side of the core sleeve respectively form an upper limiting part and a lower limiting part which extend outwards along the horizontal direction. The outer side of the middle section of the core sleeve is sleeved with the coil, the two sides of an upper wire of the coil are matched with an upper limiting part and a lower limiting part in an abutting mode respectively, the lower side of the lower limiting part is further connected with an iron sheet matched with the iron core column in an inserted mode, and the iron sheet is fixedly connected with the lower limiting part. And the coil does not need to be wound by a self-adhesive wire with relatively high cost, so that the overall material cost of the electromagnetic buzzer is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of buzzers, in particular to an electromagnetic buzzer. Background Art

[0002] Electromagnetic active buzzer is an electronic sounder that uses the effect of electromagnetic coil on buzzer to make sound. It is used as a sound device for electronic products and has warning and prompt functions. Due to its small size, long life, low energy consumption and high sound intensity, it is widely used in UPS, air conditioners, computers, printers and other electronic appliances and instruments.

[0003] The patent document with announcement number CN203118461U discloses "an electromagnetic buzzer", the specific content of which includes "an electromagnetic buzzer, including a shell, a magnetic ring tightly fitted with the inner wall of the shell is arranged inside the shell, an upper ring groove and a lower ring groove are arranged on the magnetic ring, a T iron is fixed in the upper ring groove and aligned with the center position of the magnetic ring, a magnetizing plate and a vibrating plate are fixed in the lower ring groove and arranged at the bottom of the T iron, a coil is also wound on the T iron, a guide pin plug plate is fixed above the T iron, and epoxy glue is arranged in the cavity above the guide pin plug plate" (see paragraph

[0005] of the patent document description for details).

[0004] This type of electromagnetic buzzer lacks a limiting structure for the coil on the T-iron, which causes the coil to easily fall off the T-iron and has poor structural stability. Therefore, the coil generally needs to be wound with relatively expensive self-adhesive wire, which is not conducive to reducing the overall cost of the electromagnetic buzzer.

[0005] Therefore, further improvements are needed. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide an electromagnetic buzzer, which improves the stability of the coil structure. The coil can be wound with relatively low-cost enameled wire, thereby reducing the overall cost of the electromagnetic buzzer.

[0007] The purpose of the utility model is achieved in this way:

[0008] An electromagnetic buzzer comprises an iron core column and a coil. A core sleeve is arranged between the iron core column and the coil. The cross section of the core sleeve is in an I-shaped shape. The middle section of the core sleeve is sleeved on the outside of the iron core column. The upper and lower sides of the core sleeve respectively form an upper limit portion and a lower limit portion extending outward in a horizontal direction. The coil is sleeved on the outer side of the middle section of the core sleeve. The upper and lower limit portions are respectively abutted and matched on both sides of the upper line of the coil. The lower side of the lower limit portion is also connected to an iron sheet that is plugged into the iron core column. The iron sheet is connected and fixed to the lower limit portion.

[0009] As a specific solution, the iron sheet includes a connecting part and a protruding part, the connecting part is connected and fixed to the lower limit part, the connecting part is provided with a plug-in hole corresponding to the iron core column, the plug-in hole is tightly fitted with the iron core column, the upper side of the protruding part is connected with a magnetic ring, the lower part of the magnetic ring is in contact with the protruding part, and the coil is arranged at the inner side of the magnetic ring.

[0010] As a specific solution, the lower limit portion is provided with a hollow opening and a plug-in groove extending in the horizontal direction. The shapes of the hollow opening and the plug-in groove are respectively equivalent to the protruding portion and the connecting portion. The connecting portion is connected and matched with the plug-in groove in the horizontal direction, and the protruding portion is abutted and matched with the hollow opening in the horizontal direction.

[0011] As a specific solution, the upper side of the protrusion is flush with the upper side of the lower limit portion, and another portion of the lower side of the magnetic ring is in contact and connected with the upper side of the lower limit portion.

[0012] As a specific solution, a circuit board is connected to the side of the iron sheet facing away from the lower limit portion, and the circuit board is electrically connected to the coil.

[0013] As a specific solution, the outer side of the magnetic ring is provided with a limiting sleeve, and the inner side of the limiting sleeve is tightly connected with the magnetic ring, the core sleeve and the circuit board respectively.

[0014] As a specific solution, the outer side of the limiting sleeve is provided with a shell, a filling cavity is formed between the shell and the circuit board, a glue potting layer is provided in the filling cavity, and the glue potting layer is respectively sealed and connected to the circuit board and the shell.

[0015] As a specific solution, the lower limit portion is connected to an adhesive layer, and the adhesive layer is respectively connected and fixed to the lower limit portion and the circuit board.

[0016] As a specific solution, a positioning recess for the wire to pass through is provided on the outer side of the lower limit portion, and the adhesive layer forms a filling portion at a position corresponding to the positioning recess.

[0017] As a specific solution, the coil is formed by winding non-self-adhesive enameled wire.

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

[0019] By providing the core sleeve, the overall structure of the coil is more stable and not easy to deform or fall off. The coil does not need to be wound with relatively expensive self-adhesive wire, thereby reducing the overall material cost of the electromagnetic buzzer.

[0020] Additional aspects and advantages of the present invention will become apparent in the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the utility model.

[0022] Figure 2 It is a schematic diagram of an exploded view of an embodiment of the utility model.

[0023] Figure 3 It is a schematic structural diagram of the iron sheet according to an embodiment of the utility model.

[0024] Figure 4 It is a schematic structural diagram of a core sleeve according to an embodiment of the utility model.

[0025] Figure 5 It is an enlarged view of A of the embodiment of the present invention. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0027] See also Figure 1-Figure 5 The electromagnetic buzzer includes an iron core column 1 and a coil 2. A core sleeve 3 is provided between the iron core column 1 and the coil 2. The cross section of the core sleeve 3 is in an I-shaped shape. The middle section of the core sleeve 3 is sleeved on the outside of the iron core column 1. The upper and lower sides of the core sleeve 3 respectively form an upper limit portion 31 and a lower limit portion 32 extending outward in a horizontal direction. The coil 2 is sleeved on the outer side of the middle section of the core sleeve 3. The upper limit portion 31 and the lower limit portion 32 are respectively abutted and matched on both sides of the upper line of the coil 2. When the coil 2 is wound on the outer side of the middle section of the core sleeve 3, the upper limit portion 31 and the lower limit portion 32 can limit the position of the coil 2. The upper limit portion 31 and the lower limit portion 32 can make the shape of the coil 2 more stable by abutting against the coil 2, and it is not easy to deform, and the coil 2 is not easy to fall off from the core sleeve 3.

[0028] The lower side of the lower limit portion 32 is also connected with an iron sheet 4 plugged into the iron core column 1. The iron sheet 4 is used to adsorb with the magnetic ring 5, thereby generating electromagnetic induction to enable the buzzer to work normally.

[0029] The iron sheet 4 is connected and fixed to the lower limit portion 32, so that the iron sheet 4 can be fixed on the core sleeve 3, and then the overall modularization is installed and connected with other components of the buzzer.

[0030] By providing the core sleeve 3, the overall structure of the coil 2 is more stable and not easy to deform or fall off. The coil 2 does not need to be wound with relatively expensive self-adhesive wire, thereby reducing the overall material cost of the electromagnetic buzzer.

[0031] Furthermore, the iron sheet 4 includes a connecting portion 41 and a protruding portion 42, the connecting portion 41 is connected and fixed to the lower limit portion 32, and a plug-in hole 411 corresponding to the iron core column 1 is provided on the connecting portion 41, and the plug-in hole 411 is tightly fitted with the iron core column 1. The installation connection between the iron sheet 4 and the iron core column 1 is more flexible. During the production process, the winding process can be performed on the core sleeve 3 first, and then the iron sheet 4 and the iron core column 1 can be installed and fixed on the core sleeve 3 respectively, which simplifies the winding process and improves production efficiency.

[0032] The upper side of the protrusion 42 is connected to a magnetic ring 5, the lower part of the magnetic ring 5 is in contact with the protrusion 42, the coil 2 is arranged at the inner side of the magnetic ring 5, and the magnetic ring 5 can be in contact with the iron sheet 4 through the protrusion 42, thereby generating an electromagnetic induction effect.

[0033] Furthermore, the lower limit portion 32 is provided with a hollow opening (not shown in the figure) and a plug-in groove 321 extending in the horizontal direction. The shapes of the hollow opening and the plug-in groove 321 are respectively equivalent to the protrusion 42 and the connecting portion 41. The connecting portion 41 is connected and cooperated with the plug-in groove 321 in the horizontal direction, and the protrusion 42 is abutted and cooperated with the hollow opening in the horizontal direction. During the installation process, the hollow opening of the core sleeve 3 is set in a fixed direction, so that the iron sheet 4 can move from the fixed direction toward the core sleeve 3 until the installation connection between the iron sheet 4 and the lower limit portion 32 is completed first, and then the installation connection between the core column 1 and the core sleeve 3 and the iron sheet 4 is completed.

[0034] Furthermore, the upper side of the protrusion 42 is flush with the upper side of the lower limit portion 32, and another portion of the lower side of the magnetic ring 5 is in contact with the upper side of the lower limit portion 32, so that the lower limit portion 32 and the protrusion 42 as a whole can form a relatively stable supporting structure for the magnetic ring 5.

[0035] Furthermore, a circuit board 6 is connected to the side of the iron sheet 4 facing away from the lower limit portion 32 . The circuit board 6 is electrically connected to the coil 2 . The circuit board 6 is used to provide an electrical signal to the coil 2 so that the buzzer works normally.

[0036] Furthermore, a limiting sleeve 7 is provided on the outer side of the magnetic ring 5, and the inner side of the limiting sleeve 7 is tightly connected to the magnetic ring 5, the core sleeve 3 and the circuit board 6 respectively. The limiting sleeve 7 can improve the connection stability of the magnetic ring 5, the core sleeve 3 and the circuit board 6.

[0037] Furthermore, the outer side of the limiting sleeve 7 is covered with a shell 8, and the shell 8 can protect the components inside.

[0038] A filling cavity is formed between the shell 8 and the circuit board 6 , and a glue potting layer 9 is provided in the filling cavity. The glue potting layer 9 is sealed and connected to the circuit board 6 and the shell 8 respectively, and the glue potting layer 9 can further provide sealing protection for the circuit board 6 .

[0039] Furthermore, the lower limiting portion 32 is connected with an adhesive layer 10 , and the adhesive layer 10 is respectively connected and fixed to the lower limiting portion 32 and the circuit board 6 , thereby improving the connection strength between the core sleeve 3 and the circuit board 6 .

[0040] Furthermore, a positioning recess 322 for the wire to pass through is provided on the outer side of the lower limit portion 32, and the adhesive layer 10 forms a filling portion 101 corresponding to the position of the positioning recess 322, so that the connection strength between the adhesive layer 10 and the core sleeve 3 is better. The adhesive layer 10 can also limit and fix the wire in the positioning recess 322.

[0041] Furthermore, the coil 2 is formed by winding the enameled wire without self-adhesiveness, which can reduce material costs. Moreover, the processing technology of general enameled wire is relatively simpler, and there is no need to add additional production equipment for matching the self-adhesive wire, thereby reducing equipment costs. It can also be wound on the core sleeve 3 with more efficient equipment, thereby improving production efficiency.

[0042] The above embodiments are only preferred embodiments of the present invention, and the present invention may have other embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all within the scope set by the claims of this application.

Claims

1. An electromagnetic buzzer, comprising an iron core column (1) and a coil (2), characterized in that: A core sleeve (3) is provided between the core column (1) and the coil (2); the cross section of the core sleeve (3) is in an I-shaped shape; the middle section of the core sleeve (3) is sleeved on the outside of the core column (1); upper and lower sides of the core sleeve (3) respectively form an upper limit portion (31) and a lower limit portion (32) extending outward in a horizontal direction; the coil (2) is sleeved on the outer side of the middle section of the core sleeve (3); the upper limit portion (31) and the lower limit portion (32) are respectively abutted and matched on both sides of the upper line of the coil (2); the lower side of the lower limit portion (32) is also connected to an iron sheet (4) plug-fitted with the core column (1); the iron sheet (4) is connected and fixed to the lower limit portion (32).

2. The electromagnetic buzzer according to claim 1, characterized in that: The iron sheet (4) comprises a connecting portion (41) and a protruding portion (42); the connecting portion (41) is connected and fixed to the lower limit portion (32); a plug-in hole (411) corresponding to the iron core column (1) is provided on the connecting portion (41); the plug-in hole (411) is tightly fitted and connected to the iron core column (1); a magnetic ring (5) is connected to the upper side of the protruding portion (42); a lower side portion of the magnetic ring (5) is in contact with and connected to the protruding portion (42); and the coil (2) is arranged at an inner side of the magnetic ring (5).

3. The electromagnetic buzzer according to claim 2, characterized in that: The lower limit portion (32) is provided with a hollow opening and a plug-in slot (321) extending in a horizontal direction; the shapes of the hollow opening and the plug-in slot (321) are respectively equivalent to the protruding portion (42) and the connecting portion (41); the connecting portion (41) is connected and matched with the plug-in slot (321) in a horizontal direction; and the protruding portion (42) is abutted and matched with the hollow opening in a horizontal direction.

4. The electromagnetic buzzer according to claim 2, characterized in that: The upper side of the protruding portion (42) is flush with the upper side of the lower limiting portion (32), and another portion of the lower side of the magnetic ring (5) is in contact and connected with the upper side of the lower limiting portion (32).

5. The electromagnetic buzzer according to claim 2, characterized in that: A circuit board (6) is connected to the side of the iron sheet (4) facing away from the lower limit portion (32), and the circuit board (6) is electrically connected to the coil (2).

6. The electromagnetic buzzer according to claim 5, characterized in that: The outer side of the magnetic ring (5) is provided with a limiting sleeve (7), and the inner side of the limiting sleeve (7) is tightly connected to the magnetic ring (5), the core sleeve (3) and the circuit board (6) respectively.

7. The electromagnetic buzzer according to claim 6, characterized in that: The outer side of the limiting sleeve (7) is provided with a shell (8), a filling cavity is formed between the shell (8) and the circuit board (6), a glue potting layer (9) is provided in the filling cavity, and the glue potting layer (9) is respectively sealed and connected to the circuit board (6) and the shell (8).

8. The electromagnetic buzzer according to claim 5, characterized in that: The lower limiting portion (32) is connected to an adhesive layer (10), and the adhesive layer (10) is respectively connected and fixed to the lower limiting portion (32) and the circuit board (6).

9. The electromagnetic buzzer according to claim 8, characterized in that: The outer side of the lower limit portion (32) is provided with a positioning recess (322) for a wire to pass through, and the adhesive layer (10) forms a filling portion (101) at a position corresponding to the positioning recess (322).

10. The electromagnetic buzzer according to any one of claims 1 to 9, characterized in that: The coil (2) is formed by winding an enameled wire without self-adhesiveness.

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