A new type of electromagnetic piston type electric bell

Abstract

The invention discloses a novel electromagnetic piston type electric bell, comprising a bell body and a working circuit, and also comprising a solenoid coil and a piston, wherein the solenoid coil is electrically connected to the working circuit, wherein the piston contains ferromagnetic material, and under the action of the magnetic field of the energized solenoid coil, the piston reciprocates relative to the axial direction of the solenoid coil and strikes the bell body, at least one pole of the solenoid coil is electrically connected to the working circuit through a terminal and a metal spring, and the metal spring is detachably electrically connected to the terminal, and after the solenoid coil is turned on, the magnetic field causes the piston to move and strike the metal spring to break the working circuit, and the application uses the electromagnetic solenoid coil to interact with the piston containing ferromagnetic material to continuously strike the bell body, thereby producing a sound, and compared with the traditional electric bell, the structure is simple, not easy to fail, and has strong stability, and the required working voltage and current are also smaller.

Description

Technical Field

[0001] The invention relates to the technical field of electric bell equipment, in particular to a novel electromagnetic piston type electric bell. Background Art

[0002] The principle of the electric bell is a classic example in the teaching of physics and electromagnetism. The traditional direct current bell is mainly composed of an electromagnet, an armature, an elastic metal sheet, a contact, a bell body, etc. The principle is that when the current passes through the electromagnet, the electromagnet generates magnetism to attract the armature, and the metal spring drives the bell hammer below to hit the bell body to make a sound. At the same time, after the armature is attracted by the electromagnet, the conductive sheet on the armature is separated from the contact, causing the electromagnet to lose power and lose its magnetism. Under the elastic force of the elastic metal sheet above the armature, the conductive sheet on the armature contacts the contact again, and the electromagnet is energized to generate magnetism again, and then the above action is repeated; so that the bell hammer continuously hits the bell body, so that the DC bell continuously rings. The traditional AC bell has a similar structure to the DC bell, except that the metal sheet for power failure is omitted. It relies on the periodic changes of the magnetism, magnetic poles, and magnetic force of the electromagnet after the alternating current passes through the electromagnet, which attracts the armature to vibrate and hit the bell body to make a sound. They all have common shortcomings:

[0003] First, in order for the electric bell to work smoothly, the electromagnet must produce relatively strong magnetism, which requires the electromagnet to have many turns, and at the same time requires a higher working voltage and current. For example, using a single or two ordinary dry batteries in the physics teaching process often does not work well, and generally requires a DC voltage of 6V or 12V to work.

[0004] Second, the elastic force of the elastic metal sheet on the bell must be just right. If the spring sheet is too thick, the number of turns and voltage of the electromagnet will be high, otherwise the DC bell will not work; if the spring sheet is too thin and the elastic force is too small, the spring sheet will easily deform. Once the spring sheet is deformed, the DC bell will not work smoothly.

[0005] Third, the distance between the conductor metal sheet and the contact on the metal spring of the traditional DC bell requires an adjustment screw, which is troublesome to adjust. If this gap is not adjusted properly, the DC bell may sound abnormal at best, and in serious cases, the DC bell may not work.

[0006] Fourth, the distance between the bell hammer on the metal spring and the bell body must be appropriate. Even if the gap is adjusted at the beginning, once the transportation shakes, the gap will change, causing the DC bell to not work properly. Summary of the invention

[0007] The object of the present invention is to provide a novel electromagnetic piston type electric bell to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a new type of electromagnetic piston type electric bell, comprising a bell body and a working circuit, characterized in that it also comprises a solenoid coil and a piston, the solenoid coil is electrically connected to the working circuit, the piston contains ferromagnetic material, and under the action of the solenoid coil, the piston reciprocates relative to the axial direction of the solenoid coil and strikes the bell body.

[0009] Preferably, the solenoid coil is wound on a columnar frame, the piston comprises a ferromagnetic part, a guide rod and a knock hammer, and the piston reciprocates along the axis direction of the columnar frame.

[0010] Preferably, at least one pole of the solenoid coil is electrically connected to the working circuit through a terminal and a metal spring. The metal spring is detachably electrically connected to the terminal, and the metal spring has an elastic tendency to maintain electrical connection with the terminal. After the solenoid coil is turned on, the magnetic field causes the piston to move and hit the metal spring to break the working circuit.

[0011] Preferably, the piston is also provided with a reset member for restoring its initial position.

[0012] Preferably, the reset member is a spring, and a groove for limiting the spring is provided at the end of the columnar skeleton, and the tail end of the guide rod engages with a connecting nut.

[0013] Preferably, a wiring knob is threadedly connected to the wiring post, and a contact is provided on the side of the wiring post, and the contact is electrically connected to the wiring knob.

[0014] Preferably, one end of the metal spring is connected to the column, and the other end of the metal spring is in active contact with the contact, and the metal spring is connected to the working circuit. A metal rod is provided on the column, and the metal rod is connected to the metal spring.

[0015] Preferably, the working circuit is a DC circuit.

[0016] Preferably, the ferromagnetic material is a permanent magnet, and the working circuit is an AC circuit.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present application is to interact with the piston containing ferromagnetic materials through the electromagnetic solenoid coil. When the solenoid coil is energized, a strong magnetic field is generated inside the solenoid coil and at the front and rear ends. The magnetic field will generate a magnetic force on the piston inside the solenoid coil or at the front and rear ends, causing the piston body to move. At the same time, the piston movement will drive the working circuit to be powered off so that no current passes through the solenoid coil. Then the metal spring has the tendency to keep the working circuit electrically connected, which can prompt the circuit to be connected again. In addition, the spring can be used as a reset member to make the reset process more stable, driving the piston to return to the original state even if the working circuit is connected. At this time, the solenoid coil will be energized again, so that the piston reciprocates and continuously hits the bell body, thereby making a sound. Compared with the traditional DC bell structure, the present application separates the reset member and the percussion hammer from the working circuit and does not serve as a part of it, making the device more stable. In addition, the piston part can also use a permanent magnet with strong magnetism to increase the magnetic interaction. In addition, low-voltage alternating current can also be passed through the working circuit. Under the action of the changing current, the direction of the magnetic field generated by the solenoid coil changes continuously, so that the piston reciprocates and hits the bell body to make a sound. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a top view of embodiment 1 of the present invention;

[0020] Figure 2 is a stereogram of embodiment 1 of the present invention;

[0021] Figure 3 It is an exploded view of Example 1 of the present invention;

[0022] Figure 4 This is a structural diagram of the groove portion of Example 1 of the present invention;

[0023] Figure 5 It is a schematic diagram of two binding posts of Embodiment 1 of the present invention;

[0024] Figure 6 It is an exploded view of Embodiment 2 of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0027] Fig. 9 This is a schematic diagram of the structure of Example 5 of the present invention.

[0028] In the figure: 1, bell body, 2, solenoid coil, 3, piston, 301, ferromagnetic part, 302, guide rod, 303, nut, 304, limit ring, 305, push rod, 4, support, 5, columnar frame, 501, groove, 6, knock hammer, 7, terminal, 701, terminal knob, 702, contact, 8, metal spring, 9, spring, 10, column, 101, metal rod, 11, substrate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The scheme of the present application is a new type of electromagnetic piston type electric bell, including a bell body 1 and a working circuit. The working circuit is composed of wires electrically connected to connect the power supply (such as two 1.5V dry batteries or other methods). In addition, the electric bell also includes a solenoid coil 2 and a piston 3. The solenoid coil 2 is electrically connected to the working circuit. When the solenoid coil 2 is energized, a magnetic field is generated. The piston 3 contains ferromagnetic material (which may contain a permanent magnet or a component made of a soft iron core), and under the action of the solenoid coil 2, the piston 3 reciprocates relative to the axial direction of the solenoid coil 2 and strikes the bell body 1, thereby producing a bell sound.

[0031] refer to Figure 1-5, Embodiment 1, the bell body 1 is mounted on a substrate 11, the solenoid coil 2 is wound on a columnar skeleton 5, the piston 3 includes a ferromagnetic part 301, a guide rod 302 and a hammer 6, the piston 3 penetrates the central cavity of the columnar skeleton 5 and can reciprocate therein, a terminal 7 is also provided on the substrate 11, a terminal knob 701 is threadedly connected to the terminal 7, and a contact 702 is provided on the side, when the terminal knob 701 is connected to the wire and screwed into the terminal 7, the contact 702 and the terminal knob 701 can be electrically connected, a metal spring 8 is provided on the substrate 11 through the column 10, one end of the metal spring 8 is connected to the column 10, and the other end of the metal spring 8 is connected to a contact 702 on a terminal 7 Active contact, and the metal spring 8 is connected to the working circuit, that is, a metal rod 101 is provided on the column 10, and the metal rod 101 is connected to the metal spring 8. One end of the solenoid coil 2 is directly electrically connected to one pole of the two dry batteries connected in series through a wire, and the other end is electrically connected to the wiring knob 701, and the metal spring 8 is electrically connected to the other pole of the two dry batteries connected in series through the metal rod 101. When the dry batteries are installed in series, the metal spring 8 is in contact with the contact 702 and electrically connected, so that the entire working circuit is realized, and the solenoid coil 2 is energized to generate a magnetic field. Since the piston 3 contains ferromagnetic material, the solenoid coil 2 will generate a force on the piston 3 when it is energized. Of course, the number of terminals 7 can also be two, and the connection method is as follows Figure 5 shown.

[0032] Specifically, the piston 3 includes a ferromagnetic part 301, a guide rod 302 and a hammer 6. The piston 3 passes through the central cavity of the columnar skeleton 5 and reciprocates therein. If the ferromagnetic part 301 is a soft iron core, the solenoid coil 2 will generate an attraction on the piston 3 when it is energized, causing the guide rod 302 to pass through the center of the columnar skeleton 5 (which is hollow in the middle) and move toward the metal spring 8. After touching, the metal spring 8 will detach from the contact 702, thereby disconnecting the working circuit and causing the magnetic field generated by the solenoid coil 2 to disappear.

[0033] Specifically, the piston 3 can be reset by at least the following two methods alone or in combination, that is, the metal spring 8 is brought into contact with the contact 702, that is, the working circuit is connected again.

[0034] The first type: the metal spring 8 is made of elastic metal (such as phosphor bronze sheet), and the metal spring 8 has an elastic tendency to maintain electrical connection with the terminal 7 (that is, the left end is in contact with the contact 702). At this time, the metal spring 8 is reset under the action of its own elastic force, and can push the guide rod 302 forward again, so that the striking hammer 6 hits the bell body 1 to ring the bell. At the same time, the metal spring 8 contacts the contact 702 again to connect the working circuit, and this reciprocating process is repeated to achieve continuous ringing.

[0035] The second type is that the piston 3 is also provided with a reset member for restoring its initial position, that is, specifically, a spring 9 is provided between the end of the striking hammer 6 and the columnar skeleton 5 and located on the outside of the guide rod 302, and the elastic force of the spring 9 is used to reset the piston 3 and connect the working circuit again.

[0036] Of course, if only the force of the metal spring 8 is used for the restoration, the restoration effect is not good and an inaccurate adjustment failure may occur, so the above structures can exist at the same time.

[0037] Specifically, in order to facilitate installation, the end of the columnar frame 5 is provided with a groove 501 for limiting the spring 9, and the tail end of the guide rod 302 engages with the connecting nut 303, as shown in FIG. Figure 3 The end of the guide rod 302 shown is spherical, which is conducive to pushing the metal spring 8 to move, and the nut 303 is engaged with the upper limit ring 304 of the guide rod 302, which facilitates the installation of the ferromagnetic part 301. Of course, the ferromagnetic part 301 can also be connected to the guide rod 302 by other means, such as gluing.

[0038] refer to Figure 6 In the second embodiment, since the magnetic field generated by the solenoid coil 2 after being energized is not only inside, but also at both ends, the motion trajectory of the piston 3 does not necessarily have to pass through the columnar frame 5, and the piston 3 can also move at both ends, so that the working circuit is repeatedly turned on and off (the working circuit connection method is the same as that of the first embodiment), for example Figure 6 As shown, the terminal 7, the metal spring 8, the piston 3, and the bell body 1 are all located on one side of the solenoid coil 2. The piston 3 is slidably supported by two supports 4. When the working circuit is connected, the solenoid coil 2 generates a magnetic field, which exerts a force on the ferromagnetic part 301, thereby pushing the metal spring 8, so that the working circuit is disconnected. Under the action of the reset member, the position of the piston 3 is reset. In this case, one end of the spring 9 is connected to the piston 3, and the other end is connected to the inner side of a support 4, so as to achieve elastic recovery.

[0039] The same Example 3 reference Figure 7 In this case, the movement of the piston 3 is half inside the solenoid coil 2 and half outside. In this case, the piston 3 is also connected with a push rod 305, which is used to contact the metal spring 8 during the movement of the piston 3 to break the working circuit, and then reset again under the action of the spring 9 to achieve connection, and the bell rings repeatedly in this way.

[0040] Compared with the traditional DC electric bell, the striking component (striking hammer 6) and the power-on and power-off part (metal spring 8) of Example 1, Example 2 and Example 3 are separated, and the stability of use is higher. The piston 3 contains ferromagnetic material, which can effectively reduce the required voltage. The traditional DC electric bell generally requires 6V or 9V dry batteries, and the structure of the present application only needs two dry batteries (3V) to be well driven.

[0041] In addition, for the above three embodiments, the ferromagnetic member 301 may also be a permanent magnet such as a neodymium iron boron magnet, which can have a stronger force with the magnetic field of the energized solenoid coil 2, thereby effectively reducing the number of turns required for the solenoid coil 2 or reducing the required voltage of the dry cell to a certain extent. Attention should be paid to the current flow direction of the working circuit, and it should be ensured that when the working circuit is connected, the permanent magnet will move the piston 3 toward the metal spring 8 under the action of the magnetic field generated by the solenoid coil 2, so that the metal spring 8 is separated from the contact 702, and the working circuit is disconnected.

[0042] refer to Figure 8 In Embodiment 4, the two ends of the working circuit are directly electrically connected to the two ends of the solenoid coil 2, and the current in the working circuit adopts alternating current, and the ferromagnetic member 301 in the piston 3 adopts a permanent magnet, such as Figure 8 As shown, the piston 3 is slidably supported by two supports 4. When the working circuit is operated by alternating current, the magnetic field of the solenoid coil 2 is constantly changing, so the ferromagnetic member 301 drives the piston 3 to reciprocate, thereby driving the striking hammer 6 to strike the bell body 1.

[0043] like Fig. 9 As shown in Example 5, of course, when an AC circuit is used, the positions of the piston 3 and the solenoid coil 2 can be placed in various ways. Part of the piston 3 is located in the solenoid coil 2. When the working circuit is powered by AC, the magnetic field of the solenoid coil 2 is constantly changing, so the ferromagnetic member 301 drives the piston 3 to reciprocate, thereby driving the hammer 6 to strike the bell body 1.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new electromagnetic piston type electric bell, comprising a bell body (1) and a working circuit, Features: It also comprises a solenoid coil (2) and a piston (3), wherein the solenoid coil (2) is electrically connected to a working circuit, the piston (3) contains ferromagnetic material, and under the action of a magnetic field generated when the solenoid coil (2) is energized, the piston (3) reciprocates relative to the axial direction of the solenoid coil (2) and strikes the bell body (1), the solenoid coil (2) is wound on a columnar frame (5), the piston (3) comprises a ferromagnetic part (301), a guide rod (302) and a striking hammer (6), the piston (3) reciprocates along the axial direction of the columnar frame (5), at least one pole of the solenoid coil (2) is electrically connected to the working circuit via a terminal (7) and a metal spring (8), the metal spring (8) being detachably electrically connected to the terminal (7), and after the solenoid coil (2) is switched on, the magnetic field causes the piston (3) to move and strike the metal spring (8) to disconnect the working circuit; The bell body (1) is mounted on a base plate (11). A terminal (7) is also provided on the base plate (11). A terminal knob (701) is threadedly connected to the terminal knob (701) and a contact (702) is provided on the side. When the terminal knob (701) is connected to a wire and screwed into the terminal knob (7), the contact (702) and the terminal knob (701) are electrically connected. A metal spring (8) is provided on the base plate (11) through a column (10). One end of the metal spring (8) is connected to the column (10), and the other end of the metal spring (8) is in active contact with a contact (702) on a terminal (7). A metal rod (101) is provided on the column (10). ), the metal rod (101) is connected to the metal spring (8), one end of the solenoid coil (2) is directly electrically connected to one pole of the dry battery through a wire, and the other end is electrically connected to the wiring knob (701), and the metal spring (8) is electrically connected to the other pole of the dry battery through the metal rod (101). When the dry battery is installed, the metal spring (8) is in contact with the contact point (702) to electrically connect the entire working circuit, so that the solenoid coil (2) is energized to generate a magnetic field. The solenoid coil (2) is energized to generate a force on the piston (3), and the piston (3) passes through the central cavity of the columnar skeleton (5) and reciprocates therein, and the hammer (6) is separated from the metal spring (8); The piston (3) is also provided with a reset member for restoring its initial position, the reset member being a spring (9). The spring (9) is provided between the striking hammer (6) and the end of the columnar frame (5) and on the outside of the guide rod (302). The elastic force of the spring (9) is used to reset the piston (3) so that the working circuit is connected again.

2. A new electromagnetic piston type electric bell according to claim 1, Features: The end of the columnar frame (5) is provided with a groove (501) for limiting the spring (9), and the tail end of the guide rod (302) engages with a connecting nut (303).

3. A new electromagnetic piston type electric bell according to claim 1 or 2, Features: The working circuit is a direct current circuit.

4. A new electromagnetic piston type electric bell according to claim 1, Features: The ferromagnetic material is a permanent magnet, and the working circuit is an AC circuit.

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