A magnetically controlled reed switch device

Abstract

A magnetically controlled reed switch device includes: at least one circuit board and at least two magnetically controlled reed switches; wherein the magnetically controlled reed switch includes a reed switch and a magnet. The present invention utilizes the structural features of the combination of at least one circuit board and at least two magnetically controlled reed switches to change the magnetic field strength and magnetic field line distribution position carried by the product itself, weaken the magnetic force line distribution at both ends of the device (in the direction of the north and south poles of the magnet), and increase the magnetic force line distribution in the direction perpendicular to the two ends of the device (in the direction of the north and south poles of the magnet), so as to greatly reduce the discreteness requirements of the material parameters of the original device and reduce the production cost.

Description

Technical Field

[0001] The invention relates to a magnetically controlled switch technology, in particular to a magnetically controlled reed switch device. Background Art

[0002] Reed switch is often used as a sensor and is widely used in elevator doors, sliding safety doors, places with harsh electromagnetic environment, flammable and explosive places, etc. Its principle is mainly to use the static magnetic field to act on the reed switch, and cooperate with the mobile actuator magnet (magnet) to realize the opening and closing of the switch. It is simple and easy, small, power-free, and zero power consumption. This kind of switch is resistant to external high-frequency electromagnetic field interference, has no high-frequency electromagnetic field interference to the outside world, and has good EMC electromagnetic compatibility. At the same time, the reed switch contacts are sealed in a glass tube to isolate dust, moisture, oil stains, acid and alkali, and flammable and explosive gases; the reed in the tube has small movement, long mechanical life, and a wide operating temperature of 25℃~80℃, so it has strong adaptability to the environment.

[0003] For the manufacture of reed switch, the main foreign manufacturers are: single bistable reed switch (BN) series, Schmersal single-layer sliding switch (BN32-r), Schmersal single-layer sliding switch (BN310-rz), Bernstein (BERNSTEIN) single reed switch, Bernstein single-layer products and single products, Bernstein single-layer products on sale; the main domestic manufacturers are: Ningbo Shenling, Shenyang Sanyo (Japan) door machine's single-layer bistable elevator accessories.

[0004] In the prior art, the inventor has found through research that the reed switch products disclosed at home and abroad still have the following technical problems:

[0005] (1) The distance between the polarization planes of the two poles of the magnet (excitation) used in the single-layer reed switch in the prior art is relatively large, and the distance between the polarization planes of the two poles is greater than 8 mm. That is, when the single-layer reed switch slides (moves) with the actuator magnet, the switching point width of the reed switch will be greater than 8 mm. The larger switching point width will easily lead to reduced switching accuracy; and when the single-layer reed switch slides (moves) with the actuator magnet with an overly strong magnetic field, the single-layer reed switch will produce a secondary state switch, which is likely to cause device signal errors, thereby causing this type of single-layer reed switch to be used in other devices and posing safety risks. (2) When the single-layer reed switch slides in conjunction with the actuator magnet, the state switching sequence of the reed switch cannot be reversed. The state of the reed switch can only be reversed by changing the magnetic poles of the actuator magnet. Therefore, when the actuator magnet and the single-layer reed switch are fixed on other devices, this reversible state switching brings complexity to the equipment installation, increases the cost of accessories and facilities, and reduces efficiency.

[0006] (3) Single-layer reed switches have high requirements for the non-magnetic conductivity of the mounting base. During installation, the bistable reed switch and the actuator magnet (magnet) must be raised with non-magnetic materials and separated from the mounting base by a certain distance. The operating environment requirements are high.

[0007] (4) The magnet (excitation) in a single-layer reed switch is tightly attached to the reed switch without any gap, which is not conducive to the installation, modification and adjustment of equipment components.

[0008] (5) The internal components involved in the single-layer reed switch have characteristics such as large mass, resulting in high production costs, great difficulty in operation, and poor reliability in use.

[0009] Therefore, in order to avoid the above-mentioned technical problems, the inventors have proposed a new magnetically controlled reed switch device through research and development, which can achieve fast switching while maintaining a bistable effect, and has technical effects such as small product mass and strong applicability. Summary of the invention

[0010] Based on the above technical problems, the present invention proposes a magnetically controlled reed switch device. Through the product structure design of the magnetically controlled reed switch device, the reed switch can be switched quickly in a bistable state to avoid the generation of erroneous signals. The product is light in weight, easy to install, reduces production costs, improves production efficiency, and is safer to use.

[0011] The technical solution of the present invention is as follows:

[0012] A magnetically controlled reed switch device includes: at least one circuit board and at least two magnetically controlled reed switches; wherein the magnetically controlled reed switch includes a reed switch and a magnet.

[0013] Furthermore, in the same magnetically controlled reed switch, the installation distance between the reed switch and the magnet is ≥0.1 mm.

[0014] Furthermore, the distance between the polarization surfaces of the two poles of the magnet is ≤2mm.

[0015] Furthermore, the two magnetically controlled reed switch switches include a first magnetically controlled reed switch and a second magnetically controlled reed switch, which respectively use the circuit board as a symmetry axis and are symmetrically installed on two surfaces of the circuit board; wherein the magnet of the first magnetically controlled reed switch is the first magnet, and the magnet of the second magnetically controlled reed switch is the second magnet, and the first magnet and the second magnet use the circuit board as a symmetry axis, and the north and south poles are oppositely mounted and symmetrically fixed on the circuit board.

[0016] Furthermore, the magnetically controlled reed switch device also includes a shell and a magnetic base; wherein the shell is provided with a fixing hole, a wiring hole and a mounting hole, and the shell is fixed to the magnetic base through the fixing hole.

[0017] Furthermore, the magnetically controlled reed switch device also includes a magnetic shielding plate; wherein the magnetic shielding plate is fixed to one end of the magnet in the shell, the magnetic shielding plate bridges the north and south pole edges of one end of the magnet and is parallel to the circuit board, and one end of the magnet is close to one side of the magnetic base.

[0018] Furthermore, the magnetic shielding sheet is selected from any one of electrical pure iron sheet, low carbon steel sheet, iron-aluminum alloy sheet, iron-silicon alloy sheet, iron-nickel alloy sheet, and iron-cobalt alloy sheet.

[0019] Furthermore, the magnetically controlled reed switch device also includes an indicator light control device; wherein the indicator light control device includes a reed switch and an indicator light, the reed switch is fixed to the circuit board to control the indicator light switching, the indicator light is fixed to the circuit board, and the indicator light is embedded in the shell surface through the mounting hole.

[0020] Furthermore, the magnetically controlled reed switch, the reed switch and the circuit board are all located on the inner side of the shell; the reed switch in the magnetically controlled reed switch and the reed switch of the indicator light control device are both connected to the surface of the circuit board with wires; the circuit board also has a connecting wire, which is connected to an external power supply through the wiring hole to form an indicator light current loop.

[0021] Furthermore, the shape of the wire is selected from any one or more of spiral, wavy, and curved shapes.

[0022] This technical solution has the following technical effects:

[0023] 1. The present invention changes the magnetic field strength and magnetic field line distribution of the product itself through the structural design of the magnetically controlled reed switch device and the structural features of at least one circuit board and at least two magnetically controlled reed switches, thereby weakening the magnetic field line distribution at both ends of the device (in the direction of the north and south poles of the magnet) and increasing the magnetic field line distribution in the direction perpendicular to the two ends of the device (in the direction of the north and south poles of the magnet), thereby greatly reducing the discreteness requirements of the material parameters of the original device and reducing the production cost.

[0024] 2. The present invention superimposes at least two layers of magnets and installs the north and south poles of the magnets in opposite and symmetrical positions. At this time, the magnetic lines of force of the two magnets are adsorbed side by side in the direction of the magnet axis, thereby compressing the thickness of the magnetic field of the two magnets, increasing the local magnetic flux of the magnetic field, especially increasing the magnetic flux near the switching point of the product, and increasing the accuracy of the switching point of the product, so that the entire magnetically controlled reed switch device can cooperate with the sliding of the actuator block magnet (magnet) when used as a sensor, and can achieve instant switching of the reed switch in different states; furthermore, it can avoid the dangerous problems caused by secondary switching that are easy to occur in existing single-layer products when cooperating with the movement of the actuator block magnet with strong magnetic field strength, and effectively improve the product use effect and product safety performance. At the same time, without changing the polarity of the magnetic field force, the magnetic field strength is controlled within a certain threshold range, thereby enabling the product to have a wider steady-state threshold.

[0025] 3. The present invention superimposes at least two layers of magnets and installs the north and south poles of the magnets in opposite and symmetrical positions. When the product cooperates with the actuator magnet to move, the different states of the reed switch can be switched without changing the magnetic field direction of the actuator magnet.

[0026] 4. The present invention superimposes at least two layers of magnets and installs the north and south poles of the magnets symmetrically in opposite directions, so as to attract the magnetic line loop into the narrow band surface between the two magnets, reduce the magnetic lines of force of the two magnets in all directions, and further weaken the discrete magnetic lines of force of the reed switch product, thereby reducing the sensor's requirement for a non-magnetic mounting base.

[0027] 5. The present invention improves the structure of the magnetically controlled reed switch device. The distance between the polarization surfaces of the magnet used in the product is only 0.18 to 0.25 times the distance between the polarization surfaces of the magnet used in a single magnetically controlled reed switch under the same conditions in the prior art. This improves the accuracy of the switching point, reduces the weight of the entire magnetically controlled reed switch device, and greatly reduces the discreteness requirements of the original device material parameters, thereby reducing production costs.

[0028] 6. The present invention improves the structure of the magnetically controlled reed switch device and utilizes the small size of the magnet in the product. At the same time, it can meet the magnetic field strength required for the steady-state threshold of the reed switch in the product, and achieves installation with a distance from the reed switch (the same magnetically controlled reed switch) to avoid being tightly attached to the reed switch without a gap, which is not conducive to the installation, modification and adjustment of equipment components. The gap installation of the magnet and the reed switch can make the product more stable, reliable and safe in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Attached Figure 1 : The internal structure of the magnetically controlled reed switch control device of the present invention (double-layer magnetically controlled reed switch);

[0030] Attached Figure 2: A cross-sectional view of the magnetically controlled reed switch control device of the present invention;

[0031] Attached Figure 3 : The appearance structure diagram of the magnetically controlled reed switch control device of the present invention;

[0032] Attached Figure 4 : One embodiment of the internal structure of the magnetically controlled reed switch control device of the present invention;

[0033] Attached Figure 5 : The magnetically controlled reed switch circuit diagram of the present invention;

[0034] Attached Figure 6 : The simplified circuit diagram of the indicator light control of the present invention;

[0035] Attached Figure 7 : Magnetic field line distribution diagram of a single-layer magnetically controlled reed switch device in the prior art;

[0036] Attached Figure 8 : Magnetic field line distribution diagram of the double-layer magnetron reed switch device of the present invention;

[0037] Attached Fig. 9 : Equivalent magnetic field intensity diagram corresponding to the present invention;

[0038] Attached Fig.10 : Hysteresis loop diagram of the steady-state domain.

[0039] Reference numerals:

[0040] 1-first magnetically controlled reed switch; 2-second magnetically controlled reed switch; 3-circuit board; 4-(first) reed switch; 5-first magnet; 6-(second) reed switch; 7-second magnet; 8-conducting wire; 9-magnetic shielding sheet; 10-housing; 11-magnetic base; 12-fixing hole; 13-wiring hole; 14-mounting hole; 15-housing cavity; 16-connecting wire; 17-indicator light; 18-reed switch (indicator light control switch). DETAILED DESCRIPTION

[0041] In order to further illustrate the technical solution content of the present invention, the following is described in conjunction with the accompanying drawings. At the same time, it should be noted that the technical solution content and technical features of the present invention can be used in combination with each other without conflict.

[0042] The technical terms involved in the present invention are explained as follows:

[0043] In the present invention, the terms “first” and “second” have no order of precedence and are not used to indicate specific positions. They are only used for distinction.

[0044] The principle of the reed switch is to magnetize the switch piece in the reed switch with opposite magnetic poles through an external magnetic field, so that the switch changes state from closed to open when the magnetic field approaches.

[0045] When a magnetically controlled reed switch is usually used as a sensor, it mainly adopts the normally open mode, normally closed mode or holding mode of the reed switch; while the bistable mode of the reed switch requires an external magnetic force to provide a magnetic field to the reed switch, which is called excitation, i.e. the magnet in the technical solution of the present invention. Therefore, the role of the excitation (i.e. the magnet in the technical solution) is to provide a magnetic field to the reed switch so that the reed switch obtains magnetic force and maintains the normally closed or normally open bistable mode.

[0046] Magnetic controlled reed switch: The magnet (i.e. excitation) in the magnetic controlled reed switch provides magnetic force for the normally open mode or normally closed mode of the reed switch, and then the sliding of another device (executor magnet) changes the magnetic flux at the same position, thereby switching the original mode (normally open mode or normally closed mode) of the magnetic controlled reed switch.

[0047] Steady-state domain of reed switch: When the reed switch switches from normally open holding mode (or normally closed holding mode) to normally closed holding mode (or normally open holding mode), the magnetic field strength needs to reach the pick-up value and disconnection value of the reed switch. The area between the two endpoints of the pick-up value and the disconnection value is the steady-state domain, which can also be represented by a hysteresis loop diagram. See the attached figure for details. Fig.10 .

[0048] In one embodiment of the present invention, as shown in the attached Figure 1 As shown, a magnetically controlled reed switch device comprises: at least one circuit board 3 and at least two magnetically controlled reed switches 2; wherein, the magnetically controlled reed switch 2 comprises a reed switch 4 and a magnet 5. In this embodiment, by utilizing the structural features of the combination of at least one circuit board and at least two magnetically controlled reed switches, the magnetic field strength and the distribution position of the magnetic field lines carried by the product itself are changed, the distribution of the magnetic field lines at both ends of the device (in the direction of the north and south poles of the magnet) is weakened, and the distribution of the magnetic field lines in the direction perpendicular to the two ends of the device (in the direction of the north and south poles of the magnet) is increased, so that the product is prompted to significantly reduce the discreteness requirements of the original device material parameters and reduce the production cost.

[0049] In one embodiment of the present invention, as shown in the attached Figure 2As shown, in the same magnetically controlled reed switch, the installation distance between the reed switch 6 and the second magnet 7 is ≥0.1mm. In this embodiment, by improving the structure of the magnetically controlled reed switch device, the magnet of the product has the characteristic of small volume, and at the same time can meet the magnetic field strength required for the steady-state threshold of the reed switch in the product. The improvement of the structure can meet the control of the adjustable distance between the reed switch and the magnet, so as to avoid close contact with the reed switch without gap, which is not conducive to the installation, modification and adjustment of equipment components; the gap installation of the magnet and the reed switch can make the product more stable, reliable and safe in use.

[0050] In one embodiment of the present invention, the distance between the polarization surfaces of the two poles of the magnet is ≤2mm. In this embodiment, the structure of the magnetically controlled reed switch device is improved, and the distance between the polarization surfaces of the magnet used in the product is only 0.18 to 0.25 times the distance between the polarization surfaces of the magnet used in a single magnetically controlled reed switch under the same conditions in the prior art; the volume of the magnet is reduced, thereby improving the accuracy of the switching point, reducing the mass of the entire magnetically controlled reed switch device, and greatly reducing the discreteness requirements of the original device material parameters, thereby reducing production costs.

[0051] In one embodiment of the present invention, in combination with the attached Figure 2 , Attachment Figure 7 And attached Figure 8 As shown, the two magnetically controlled reed switch include a first magnetically controlled reed switch 1 and a second magnetically controlled reed switch 2, which are symmetrically mounted on the two surfaces of the circuit board 3, respectively, with the circuit board 3 as the axis of symmetry; wherein the magnet of the first magnetically controlled reed switch 1 is the first magnet 5, and the magnet of the second magnetically controlled reed switch 2 is the second magnet 7, and the first magnet 5 and the second magnet 7 are symmetrically fixed on the circuit board 3 with the circuit board 3 as the axis of symmetry, and the north and south poles are oppositely mounted. In this embodiment, at least two layers of magnets are superimposed and the north and south poles of the magnets are oppositely mounted symmetrically, and the circuit board is used as a bracket to support the two magnetically controlled reed switch switches on both sides thereof and enable the two magnetically controlled reed switch switches to be fixed on the circuit board; at this time, the magnetic lines of force of the two magnets are adsorbed side by side in the direction of the magnet axis, thereby compressing the thickness of the magnetic field of the two magnets (as shown in the attached figure). Figure 8As shown in the figure, the local magnetic flux of the magnetic field is increased, especially the magnetic flux near the switching point of the product, and the switching point accuracy of the product is increased, so that the entire magnetic control reed switch device can cooperate with the sliding of the actuator block magnet (magnet) when used as a sensor, and can realize the instant switching of the reed switch in different states; furthermore, it can avoid the dangerous problems caused by the secondary switching that is easy to occur when the existing single-layer product cooperates with the movement of the actuator block magnet with strong magnetic field strength, and effectively improve the product use effect and product safety performance. At the same time, without changing the polarity of the magnetic field force, the magnetic field strength is controlled within a certain threshold range, thereby enabling the product to have a wider steady-state threshold. This embodiment also assembles the product by combining the use of multiple magnetically controlled reed switch switches with the magnets in the magnetically controlled reed switch switches to symmetrically fix the north and south poles in opposite directions, thereby achieving that the reed switch of the product has both a normally open holding mode and a normally closed holding mode. Therefore, when the product is switched in conjunction with the actuator magnet, the holding modes of different states of the reed switch can be obtained without changing the magnetic field direction of the actuator magnet, which greatly reduces the installation restrictions of the product when used in conjunction with the actuator magnet, and is more flexible and effective in use.

[0052] In one embodiment of the present invention, as shown in the attached Figure 3 As shown, the magnetically controlled reed switch device also includes a shell 10 and a magnetic base 11; wherein the shell 10 is provided with a fixing hole 12, a wiring hole 13 and a mounting hole 14, and the shell 10 is fixed to the magnetic base 11 through the fixing hole 12. In this embodiment, the internal components of the magnetically controlled reed switch control device are covered by the magnetic base and the shell, and the circuit board is embedded in the shell. It should be noted that the magnetic base is not limited to the base carried by the product itself, and a non-magnetic position on the application equipment can also be selected as the base of the magnetically controlled reed switch switch device, thereby reflecting the characteristics of the product of the present invention having low requirements for installation conditions and strong applicability; in the implementation process, in order to firmly fix the internal components, two-component AB epoxy glue or waterproof vibration-damping foam glue can be filled in the shell, and the product has a reasonably designed hole structure after it is formed, so that it is easy to install.

[0053] In one embodiment of the present invention, in combination with the attached Figure 2 , Attachment Figure 3 or attached Figure 4As shown, the magnetically controlled reed switch device further includes a magnetic shielding sheet 9; wherein the magnetic shielding sheet 9 is fixed to one end of the second magnet 7 in the housing 10, the magnetic shielding sheet 9 bridges the north and south pole edges of one end of the second magnet 7, and is parallel to the circuit board 3, and one end of the second magnet 7 is close to one side of the magnetic base 11. In this embodiment, by using the magnetic shielding sheet, the product of the present invention can achieve secondary shielding of magnetic lines of force, and the magnetic shielding sheet has a weak magnetic effect, thereby further reducing the requirements of the product for the installation base; by selecting a magnet close to the magnetic base to install the magnetic shielding sheet, the magnetic line distribution close to the magnetic base can be shielded to the maximum extent, thereby reducing the requirements for the installation base.

[0054] In one embodiment of the present invention, as shown in the attached Figure 2 or attached Figure 3 As shown, the magnetic shielding sheet 9 is selected from any one of electrical pure iron sheet, low carbon steel sheet, iron aluminum alloy sheet, iron silicon alloy sheet, iron nickel alloy sheet, and iron cobalt alloy sheet. In this embodiment, the magnetic shielding sheet can be selected from magnetic conductive materials, any of which can be used.

[0055] In one embodiment of the present invention, in combination with the attached Figure 2 , Attachment Figure 3 and attached Figure 4 As shown, the magnetically controlled reed switch device further includes an indicator light control device; wherein the indicator light control device includes a reed switch 18 and an indicator light 17, wherein the reed switch 18 is fixed to the circuit board 3 to control the light switching of the indicator light 17, the indicator light 17 is fixed to the circuit board 3, and the indicator light 17 is embedded in the surface of the housing 10 through the mounting hole 14. In this embodiment, through the design of the indicator light, when the device slides in cooperation with the external actuator (magnet), the indicator light can change to red and green. By using the change in the color of the indicator light, it can be known that the state of the internal magnetically controlled switch has changed. As a preferred method, the indicator light can be a LED two-color indicator light.

[0056] In one embodiment of the present invention, in combination with the attached Figure 2 , Attachment Figure 3 , Attachment Figure 4 , Attachment Figure 5 And attached Figure 6As shown, the magnetically controlled reed switch, the reed switch and the circuit board are all located inside the shell; the reed switch in the magnetically controlled reed switch and the reed switch of the indicator light control device are connected to the surface of the circuit board with wires; the circuit board also has connecting wires, which are connected to an external power source through wiring holes to form an indicator light current loop. In this embodiment, the connecting wires on the circuit board are used to connect to an external power source to form a low-voltage, low-current signal to control the reed switch to control the indicator light. At the same time, the controlled reed switch is placed in the same magnetic field as other reed switches on the same side of the circuit board, thereby achieving a synchronous state change effect. By changing the state of the controlled reed switch, the color of the indicator light changes, giving the user a prompt. By combining the attached Figure 5 and attached Figure 6 The simplified circuit diagram shown controls the color change of the indicator light, where one color appears when the switch is closed and another color appears when the switch is open.

[0057] In one embodiment of the present invention, the shape of the wire is selected from any one or more of spiral, wavy, and curved shapes. In this embodiment, the bending design of the wire allows the installation or replacement of the reed switch to be free from the control of the contact point or position, making it easy to install and replace, and to adjust the distance between the reed switch and the magnet.

[0058] In order to illustrate the technical solution of the present invention in more detail, the technical solution of the present invention is described below in combination with its implementation and application and the accompanying drawings.

[0059] Example 1

[0060] Combined with Figure 1 and attached Figure 3As shown, a magnetically controlled reed switch device comprises: a circuit board 3 and two magnetically controlled reed switches 1 and 2; wherein the magnetically controlled reed switch 1 comprises a reed switch 4 and a magnet 5. In the same magnetically controlled reed switch 1, the installation distance between the reed switch 4 and the magnet 5 is 1 mm; in the same magnetically controlled reed switch 2, the installation distance between the reed switch 6 and the second magnet 7 is 1 mm. The two magnetically controlled reed switches comprise a first magnetically controlled reed switch 1 and a second magnetically controlled reed switch 2, which respectively use the circuit board 3 as the axis of symmetry and are symmetrically installed on the two surfaces of the circuit board 3; wherein the magnet of the first magnetically controlled reed switch 1 is the first magnet 5, and the magnet of the second magnetically controlled reed switch 2 is the second magnet 7, and the first magnet 5 and the second magnet 7 use the circuit board 3 as the axis of symmetry, and the north and south poles are oppositely mounted and symmetrically fixed on the circuit board 3. The distance between the polarization surfaces of the two poles of the first magnet 5 is 2 mm; the distance between the polarization surfaces of the two poles of the second magnet 7 is 1.5 mm. The magnetically controlled reed switch device also includes a shell 10 and a magnetic base 11; wherein the shell 10 is provided with a fixing hole 12, a wiring hole 13 and a mounting hole 14, and the shell 10 is fixed to the magnetic base 11 through the fixing hole 13. Through the above-mentioned product assembly, the first magnet 5 and the second magnet 7 are assembled with square magnets (the distance between the polarization surfaces of the two poles is 2mm) to obtain product 1, and the square magnet of product 1 is replaced with a circular magnet (the distance between the polarization surfaces of the two poles is 2mm) to obtain product 2 after assembly. At this time, product 1 and product 2 each have a first magnet 5 and a second magnet 7 with opposite north and south poles (for example, attached Figure 8 shown).

[0061] In order to reflect the technical effect of the product of the present invention, the prior art product is a single-layer magnetically controlled reed switch device. Therefore, one of the two magnetically controlled reed switches of the above-mentioned product 1 is removed to obtain the prior art single-layer magnetically controlled reed switch product 3; one of the two magnetically controlled reed switches of the above-mentioned product 2 is removed to obtain the prior art single-layer magnetically controlled reed switch product 4, and

[0062] The magnetic field line distributions of the single-layer magnetic control reed switch product of the prior art and the double-layer magnetic control reed switch device of the present invention are shown in the attached figure. Figure 7 , Attachment Figure 8 shown.

[0063] The TD8620 Tesla meter was used to test and compare the magnetic field strength and magnetic field polarity of product 1, product 2, product 3 and product 4 at different test distances (three tests of A, B and C), with the test parameters shown in Table 1 below:

[0064]

[0065] Table 1

[0066] From Table 1, it can be seen that test A is conducted at the same test distance, test B is conducted at the same test distance, and test C is conducted at the same test distance. This product combines multi-layer magnets and fixed installation in the north and south pole directions. Compared with existing technical products at the same distance, the magnetic field strength at the same position is greatly weakened, achieving the first step of weakening the magnetic field strength; and compressing the magnetic field line diagram to make it side by side near the adsorption axis to avoid affecting the magnetic field strength provided to the reed switch. At the same time, it can be seen from the test magnetic field strength parameters that this product only weakens the magnetic field strength without changing the magnetic field direction, thereby avoiding changes to the state maintained by the reed switch.

[0067] Example 2

[0068] Combined with Figure 3 , Attachment Figure 4 And attached Figure 5 As shown, a magnetically controlled reed switch device comprises: a circuit board 3 and two magnetically controlled reed switches 1; wherein the magnetically controlled reed switch 1 comprises a reed switch 4 and a magnet 5. In the same magnetically controlled reed switch 1, the installation distance between the reed switch 4 and the magnet 5 is 2 mm; in the same magnetically controlled reed switch 2, the installation distance between the reed switch 6 and the second magnet 7 is 2 mm. The distance between the polarization surfaces of the two poles of the magnet 5 is 1.5 mm; the distance between the polarization surfaces of the two poles of the second magnet 7 is 1.5 mm; the magnet 5 and the second magnet 7 are both square magnets. Two magnetically controlled reed switch switches include a first magnetically controlled reed switch 1 and a second magnetically controlled reed switch 2, which respectively use a circuit board 3 as a symmetry axis and are symmetrically installed on two surfaces of the circuit board 3; wherein the magnet 5 of the first magnetically controlled reed switch 1 is the first magnet 5, and the second magnet 7 of the second magnetically controlled reed switch 2 is the second magnet 7, and the first magnet 5 and the second magnet 7 use the circuit board 3 as a symmetry axis, and the north and south poles are oppositely mounted and symmetrically fixed on the circuit board 3.

[0069] The magnetically controlled reed switch device also includes a housing 10 and a magnetically conductive base 11; wherein the housing 10 is provided with a fixing hole 12, a wiring hole 13 and a mounting hole 14, and the housing 10 is fixed to the magnetically conductive base 11 through the fixing hole 12. The magnetically controlled reed switch device also includes a magnetic shielding sheet 9; wherein the magnetic shielding sheet 9 is fixed to one end of the second magnet 7 in the housing 10, the magnetic shielding sheet 9 bridges the north and south pole edges of one end of the second magnet 7, and is parallel to the circuit board 3, and one end of the second magnet 7 is close to one side of the magnetically conductive base 11. The magnetic shielding sheet 9 uses an electrical pure iron sheet as a magnetic shielding sheet.

[0070] The magnetically controlled reed switch device also includes an indicator light control device; wherein the indicator light control device includes a reed switch 18 and an indicator light 17, the reed switch 18 is fixed to the circuit board 3 to control the light switching of the indicator light 17, the indicator light 17 is fixed to the circuit board 3, and the indicator light 17 is embedded in the surface of the shell 10 through the mounting hole 14.

[0071] The magnetically controlled reed switch 1 and the magnetically controlled reed switch 2, the reed switch 18 and the circuit board 3 are all located inside the housing 10; the reed switch 4 or 6 in the magnetically controlled reed switch 1 or 2 and the reed switch 18 of the indicator light 17 control device are connected to the surface of the circuit board 3 by a wire 8; the circuit board 3 also has a connecting wire 16, which is connected to an external power supply through a wiring hole 13 to form a current loop for the indicator light 17. The wire 8 is arranged in a wavy and curved shape.

[0072] After assembling the above products, the product 4 of the present invention is obtained. The product 4 is disassembled to obtain the product 5 by removing a magnetically controlled reed switch. At this time, the internal components of the shell of the product 5 include a magnetically controlled reed switch, a circuit board, a magnetic shielding sheet, and an indicator light. After removing the magnetic shielding sheet in the product 5, the prior art product 6 can be obtained. At this time, the internal components of the shell of the product 6 include a magnetically controlled reed switch, a circuit board, and an indicator light; and an indicator light device is added to the product 2 of the embodiment 1. Therefore, the indicator lights of the products 2, 4, 5, and 6 all use LED dual-color indicator lights.

[0073] The following tests are conducted on the magnetic field strength, switching effect and other parameters of products 2, 4, 5 and 6 at the same location, with the test results shown in Table 2. The magnetic field strength in the table below uses a TD8620 Tesla meter:

[0074]

[0075] Table 2

[0076] According to the test parameters in Table 2, the product of the present invention has the function of instantly switching the state of the reed switch in the product, and by using the magnetic shielding sheet, the magnetically controlled reed switch device further reduces the non-magnetic conductivity requirement of its mounting base.

[0077] Example 3

[0078] Product 4 provided in Example 2 of the present invention is used, and its magnet is selected as a 1.5mm wide neodymium iron boron (excitation) magnet, and the reed switch adopts the Japanese Okinawa ORD229 / 35~40AT reed switch. The test head is closely attached to the glass shell above the contact of the reed switch and remains fixed.

[0079] The (excitation) magnet gradually approaches the Okinawa ORD229 / 35~40AT reed switch in Japan, so that the reed switch is just closed, and the magnetic field strength above the reed switch is measured to be 28GS (Gauss), and the distance between the reed switch and the (excitation) magnet is 9mm; then the (excitation) magnet is gradually moved away from the reed switch, so that the reed switch is just released and disconnected, and the magnetic field strength above the reed switch is measured to be 8GS (Gauss), and the distance between the reed switch and the (excitation) magnet is 18mm. Therefore, the equivalent magnetic field strength in the steady-state domain when the distance between the reed switch and the NdFeB (excitation) magnet is 9.0mm~18.0mm is: 28GS (Gauss)~8GS (Gauss).

[0080] A set of distance and equivalent magnetic field strength data were measured near the steady-state domain of the double-layer magnetic shield magnetically controlled reed switch device as shown in Table 3 below. The corresponding equivalent magnetic field strength diagram is shown in the attached figure. Fig. 9 As shown:

[0081]

[0082]

[0083] Table 3

[0084] Through the above test data and attached Fig. 9 It can be seen that the product of the present invention has a wider steady-state domain, and the magnetic field strength curve is relatively stable during the steady-state domain. The magnetically controlled reed switch device provided by the present invention can narrow the magnetic field to weaken the peripheral magnetic field strength, reduce the requirements for the non-magnetic conductivity of the mounting base, reduce the influence of the magnetic conductivity of the mounting base on the sensor, achieve installation convenience, and ensure that the magnetic field strength it provides can meet the requirements of the reed switch switch state change.

Claims

1. A magnetically controlled reed switch device, comprising: At least one circuit board and at least two magnetically controlled reed switch; wherein the magnetically controlled reed switch comprises a reed switch and a magnet; In the same magnetically controlled reed switch, the installation distance between the reed switch and the magnet is ≥ 0.1 mm; The distance between the polarization surfaces of the two poles of the magnet is ≤2mm; The two magnetically controlled reed switch switches include a first magnetically controlled reed switch and a second magnetically controlled reed switch, which respectively use the circuit board as a symmetry axis and are symmetrically installed on two surfaces of the circuit board; wherein the magnet of the first magnetically controlled reed switch is the first magnet, and the magnet of the second magnetically controlled reed switch is the second magnet, and the first magnet and the second magnet use the circuit board as a symmetry axis, and the north and south poles are oppositely mounted and symmetrically fixed on the circuit board.

2. A magnetically controlled reed switch device according to claim 1, characterized in that: The magnetically controlled reed switch device further includes a shell and a magnetic base; wherein the shell is provided with a fixing hole, a wiring hole and a mounting hole, and the shell is fixed to the magnetic base through the fixing hole.

3. A magnetically controlled reed switch device according to claim 2, characterized in that: The magnetically controlled reed switch device also includes a magnetic shielding plate; wherein the magnetic shielding plate is fixed to one end of the magnet in the shell, the magnetic shielding plate bridges the north and south pole edges of one end of the magnet and is parallel to the circuit board, and one end of the magnet is close to one side of the magnetic base.

4. A magnetically controlled reed switch device according to claim 3, characterized in that: The magnetic shielding sheet is selected from any one of electrical pure iron sheet, low carbon steel sheet, iron-aluminum alloy sheet, iron-silicon alloy sheet, iron-nickel alloy sheet and iron-cobalt alloy sheet.

5. A magnetically controlled reed switch device according to claim 3, characterized in that: The magnetically controlled reed switch device also includes an indicator light control device; wherein the indicator light control device includes a reed switch and an indicator light, the reed switch is fixed to the circuit board to control the indicator light switching, the indicator light is fixed to the circuit board, and the indicator light is embedded in the shell surface through the mounting hole.

6. A magnetically controlled reed switch device according to claim 5, characterized in that: The magnetically controlled reed switch, the reed switch and the circuit board are all located inside the shell; the reed switch in the magnetically controlled reed switch and the reed switch of the indicator light control device are both connected to the surface of the circuit board by wires; the circuit board also has a connecting wire, which is connected to an external power supply through the wiring hole to form an indicator light current loop.

7. A magnetically controlled reed switch device according to claim 6, characterized in that: The wire setting shape is selected from any one or more of spiral, wavy and curved shapes.

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