Switch assembly and safety device

Abstract

The invention discloses a switch assembly and a safety device, the switch assembly comprises a relay and a switch unit which are connected in parallel, and the switch unit and the relay are configured to be in a normal working state that the relay is closed and the switch unit is disconnected; the relay comprises a relay body and a shielding cover covering the relay body, the relay body comprises a fixed part and a moving part, and the moving part moves relative to the fixed part and at least has a motion component in the Z-axis direction; the switch unit is arranged close to the relay and comprises at least one reed switch, and the switch unit is suitable for being closed when an external magnetic field passes through a first area around the switch unit; the relay is suitable for being disconnected when the external magnetic field passes through a second area around the relay; the first area and the second area are at least partially overlapped to keep the switch assembly closed; the safety device comprises the safety assembly. The device can be kept closed when being interfered by an external magnetic field, and is safer and more reliable during application.

Description

Technical Field

[0001] The present invention relates to the technical field of switches, and in particular to a switch component and a safety device. Background Art

[0002] Traditional relays are based on electromagnetic effects to control the power on and off of the coil, which can control the movement of the contacts, thereby achieving control of the circuit. The relay is mainly composed of a coil, an iron core, an armature assembly, and a reed and contact that are linked to the armature assembly. When voltage is applied to both ends of the coil or current is passed through, the coil will generate a magnetic field. The electromagnetic force generated by the coil will overcome the reaction force of the reed to attract the armature and make it move. The armature will drive the moving contact to contact or separate from the static contact, thereby achieving the on (off) function of the switch. When this traditional structure of the relay is in a strong magnetic field environment, the external magnetic field will interact with the magnetic field inside the relay, thereby affecting the attraction of the electromagnet to the armature, resulting in abnormal contact movement. In particular, when this relay is used in the field of access control as a control switch for security doors, the malfunction of the relay will bring safety hazards. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background technology and to provide a switch assembly and a safety device which can remain closed even when disturbed by an external magnetic field and are safer and more reliable when used.

[0004] To achieve the above objectives, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0005] Technical solution one and its related embodiments design a switch assembly, including a relay and a switch unit connected in parallel with each other, the switch unit and the relay are configured so that the relay is closed and the switch unit is disconnected in a normal working state; the relay includes a relay body and a shielding cover arranged outside the relay body, the relay body includes a fixed part and a moving part, the moving part moves relative to the fixed part and has at least a movement component in the Z-axis direction; the switch unit is placed close to the relay and includes at least one reed switch, the switch unit is suitable for closing when an external magnetic field passes through a first area around it; the relay is suitable for disconnecting when an external magnetic field passes through a second area around it; the first area and the second area at least partially overlap to keep the switch assembly closed; the reed switch is configured to extend along the Z-axis direction when there is one reed switch.

[0006] Based on Technical Solution One, Technical Solution Two is also provided. In Technical Solution Two and its related embodiments, each reed switch is suitable for closing when the external magnetic field passes through a third area around it, and remaining open when the external magnetic field passes through a fourth area around it, and the third area and the fourth area are arranged along the circumference of the reed switch; when the number of the reed switches is at least two, the reed switches are connected in parallel and placed crosswise with each other so that the fourth area of ​​one of the two intersecting reed switches at least partially overlaps with the third area of ​​the other reed switch.

[0007] Based on Technical Solution 2, there is also provided Technical Solution 3. In Technical Solution 3 and its related embodiments, the number of the reed switches is at least two, and at least two reed switches in each reed switch are perpendicular to each other.

[0008] Based on Technical Solution 3, Technical Solution 4 is also provided. In Technical Solution 4 and its related embodiments, the switch unit is located on one side of the relay along the X-axis direction or the Y-axis direction; the number of the reed switches is only two, and the intersection axis of the two reed switches is perpendicular to the Z-axis direction.

[0009] Based on technical solution four, technical solution five is also provided. In technical solution five and its related embodiments, the length direction of the relay is the X-axis direction, the moving part includes an armature, and the width direction of the armature is the Y-axis direction; the switch unit is located on one side of the relay along the Y-axis direction; the cross axis is parallel to the Y-axis direction and is located in the middle of the relay.

[0010] Based on technical solution five, there is also provided technical solution six. In technical solution six and its related embodiments, both reed switches are inclined relative to the Z-axis direction.

[0011] Based on Technical Solution Three, there is also a Technical Solution Seven. In Technical Solution Seven and its related embodiments, the number of the reed switches is three, and the three reed switches cross each other vertically.

[0012] Based on Technical Solution Seven, Technical Solution Eight is also provided. In Technical Solution Eight and its related embodiments, the switch unit is located on one side of the relay along the X-axis direction or the Y-axis direction, wherein the extension direction of one reed switch is perpendicular to the Z-axis direction, and the intersection axes of the remaining two perpendicularly crossed reed switches are parallel to the reed spring and the remaining two reed switches are inclined relative to the Z-axis direction.

[0013] Based on any one of technical solutions four to six, there is also a technical solution nine. Technical solution nine and its related embodiments also include an electric control board, and the relay and the switch unit are electrically connected to the electric control board to achieve parallel connection; pin terminals are respectively provided at both ends of each reed switch, and each pin terminal is plugged into the electric control board to connect the two reed switches in parallel.

[0014] Based on technical solution seven or eight, there is also a technical solution ten. Technical solution ten and its related embodiments also include an electric control board, and the relay and the switch unit are electrically connected to the electric control board to achieve parallel connection; pin terminals are provided at both ends of each reed switch, and each pin terminal is plugged into the electric control board to make the three reed switches connected in parallel; one of the reed switches is attached to the electric control board.

[0015] Technical solution eleven and its related embodiments provide a safety device for controlling the access control of a security door and for being installed on a fixed first wall, wherein the first wall is perpendicular to the Z-axis direction. The safety device adopts the switch assembly described in technical solution nine and also includes a housing, wherein the housing cover is arranged outside the relay and the switch unit.

[0016] Technical solution 12 and its related embodiments provide a safety device for controlling access to a security door. The safety device adopts the switch assembly described in technical solution 10 and also includes a shell, and the shell cover is arranged outside the relay and the switch unit.

[0017] From the above description of the present invention and its preferred embodiments, it can be seen that, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0018] In the technical solution 1 and its preferred embodiments, "normal working state" means "no external magnetic field passes or the magnetic field strength of the external magnetic field is very weak, and the influence on the switch component can be ignored"; in this technical solution, since the moving part moves relative to the fixed part and has at least a moving component in the Z-axis direction, when the direction of the external magnetic field is in the Z-axis direction, it is easier to cause abnormal movement of the moving part, thereby causing the relay to be abnormally disconnected. In this technical solution, the switch unit includes a relay and a switch unit connected in parallel to each other, and the switch unit and the relay are configured so that in the normal working state, the relay is closed and the switch unit is disconnected, so that the switch component remains closed in the normal working state and is only disconnected when the relay is driven to disconnect by an external instruction, wherein the switch unit and the relay body are separated by a shielding cover to avoid the influence of the magnetic field of the relay body itself on the switch unit;

[0019] The switch unit is placed close to the relay and includes at least one reed switch. The switch unit is suitable for closing when an external magnetic field passes through a first area around it; the relay is suitable for disconnecting when an external magnetic field passes through a second area around it; the first area and the second area at least partially overlap to keep the switch assembly closed; since the sensitivity of the reed switch to the external magnetic field is higher than the sensitivity of the relay to the external magnetic field strength, the switch unit is placed close to the relay so that the reed switch can be affected by the external magnetic field before the relay, and since the first area and the second area at least partially overlap, the switch unit can be closed before the relay is abnormally disconnected due to the influence of the external magnetic field. When the external magnetic field passes, the switch unit switches to a closed state earlier. At this time, even if the relay is also switched to an open state, the switch assembly can still remain in a closed state, thereby improving the safety and reliability of the switch assembly when it is used; the reed switch is configured to extend along the Z-axis direction when there is only one reed switch, which can make the reed switch more susceptible to the external magnetic field with a magnetic field direction in the Z-axis direction, so that it is easier to close when the external magnetic field direction is in the Z-axis direction, thereby keeping the switch assembly closed, and the setting of one reed switch is easier to reduce production costs and assembly costs.

[0020] In technical solution two and its preferred embodiments, each reed switch is suitable for closing when the external magnetic field passes through the third area around it, and remains open when the external magnetic field passes through the fourth area around it, and the third area and the fourth area are arranged along the circumference of the reed switch; when the number of reed switches is at least two, the reed switches are connected in parallel and placed crosswise with each other so that the fourth area of ​​one of the two intersecting reed switches at least partially overlaps with the third area of ​​the other reed switch, which can increase the space of the first area when the external magnetic field passes through the switch unit. The parallel connection of the reed switches increases the probability that at least one reed switch can be switched to a closed state, thereby improving the sensitivity range of the switch unit to the external magnetic field, thereby improving the safety and reliability of the switch assembly when it is used. It should be understood that "the reed switches are placed crosswise with each other" here means "the projection of the intersection point of each reed switch is located on the corresponding reed switch rather than on the extension line of the reed switch along its extension direction".

[0021] In technical solution three and its preferred embodiments, when the number of reed switches is at least two, at least two of the reed switches in each reed switch cross each other vertically. Compared with only two reed switches in each reed switch crossing at an angle, the overlapping space between the fourth area of ​​the two vertically crossed reed switches and the third area of ​​the other reed switch is increased, which can further increase the space of the first area when the external magnetic field passes through the switch unit, thereby further improving the sensitivity range of the switch unit to the external magnetic field, thereby improving the safety and reliability of the switch assembly when it is used.

[0022] In technical solution four and its preferred embodiments, since the switch unit only includes two perpendicularly crossed reed switches, the switch unit remains disconnected only when the direction of the external magnetic field is parallel to the direction of the cross axis and the external magnetic field approaches the switch unit along the cross axis, while in other cases, the switch unit will be closed when the external magnetic field passes through the first area around it, and the relay body will abnormally switch to the disconnected state only when the external magnetic field approaches the relay mainly along the Z-axis direction. Therefore, in this technical solution, the switch unit is located on one side of the relay along the X-axis direction or the Y-axis direction, the number of reed switches is only two, and the cross axis of the two reed switches is perpendicular to the Z-axis direction, so that the external magnetic field that cannot close the switch unit has less effect on the relay body, while the external magnetic field that affects the relay body can affect the switch unit, thereby ensuring that when the space in the first area is large, the external magnetic field that affects the relay body will first act on the switch unit, so that the switch unit is closed before the relay is abnormally disconnected, ensuring that the switch assembly remains in a closed state, thereby improving the safety and reliability of the switch assembly when used. Furthermore, the switch unit is located on one side of the relay along the X-axis direction or the Y-axis direction, which is also beneficial to reducing the space occupied by the entire switch assembly in the Z-axis direction, thereby facilitating the flattening of the switch assembly.

[0023] In technical solution five and its preferred embodiments, the length direction of the relay is the X-axis direction, the moving part includes an armature, and the width direction of the armature is the Y-axis direction; the switch unit is located on one side of the relay along the Y-axis direction, and the cross axis is parallel to the Y-axis direction and is located in the middle of the relay. Compared with the switch unit being located on one side of the relay along the X-axis direction, the overlapping space between the first area and the second area can be further increased, thereby improving the safety and reliability of the switch assembly during application.

[0024] In technical solution six and its preferred embodiment, the two reed switches are inclined relative to the Z-axis direction. Compared with the solution in which one of the reed switches extends along the Z-axis direction, it is more conducive to increasing the length of the reed switch under the condition that the length of the switch assembly along the Z-axis direction is certain, thereby increasing the space of the first area and increasing the overlapping space between the first area and the second area, further ensuring that the switch assembly can remain in a closed state even when an external magnetic field passes through, thereby improving the safety and reliability of the switch assembly during application.

[0025] In technical solution seven and its related embodiments, since the switch unit only includes two perpendicularly intersecting reed switches, the switch unit remains disconnected when the direction of the external magnetic field is parallel to the direction of the intersection axis and the external magnetic field approaches the switch unit along the intersection axis. In this solution, the number of reed switches is three, and the three reed switches are perpendicular to each other. Then, when the direction of the external magnetic field is parallel to the intersection axis of two of the perpendicularly intersecting reed switches and approaches the switch unit along the intersection axis, the switch unit can also be closed. That is to say, the third area of ​​the newly added reed switch can partially overlap with the fourth areas of the other two reed switches, thereby further increasing the space of the first area of ​​the switch unit and increasing the overlapping space of the first area and the second area, further ensuring that the switch assembly can maintain its initial working state even when the external magnetic field passes by, thereby improving the safety and reliability of the switch assembly during application.

[0026] In technical solution eight and its related embodiments, the switch unit is located on one side of the relay along the X-axis direction or the Y-axis direction, and the extension direction of one of the reed switches is perpendicular to the Z-axis direction, the intersection axes of the remaining two perpendicularly crossed reed switches are parallel to the reed spring and the remaining two reed switches are inclined relative to the Z-axis direction, which is beneficial to reducing the space occupied by the entire switch assembly in the Z-axis direction, thereby facilitating the flattening of the switch assembly. Compared with the solution in which the extension directions of two reed switches are perpendicular to the Z-axis direction, it is more beneficial to increase the length of the reed switch under the condition that the length of the switch assembly along the Z-axis direction is certain, thereby increasing the space of the first area and increasing the overlapping space of the first area and the second area, further ensuring that the switch assembly can remain in a closed state even when an external magnetic field passes through, thereby improving the safety and reliability of the switch assembly during application.

[0027] In technical solution nine, the relay and the switch unit are electrically connected to the electronic control board to achieve parallel connection, and the electrical connection is reliable; pin terminals are provided at both ends of each reed switch, and each pin terminal is plugged into the electronic control board to enable the reed switches to be connected in parallel, which is conducive to achieving the electrical connection between the relay and the switch unit, and the reed switch can be fixed relative to the relay by plugging into the electronic control board, without the need for other fixing structures, and the structure is simpler.

[0028] In technical solution ten, the number of reed switches is three, and the relay and the switch unit are electrically connected to the electronic control board to achieve parallel connection, and the electrical connection is reliable; pin terminals are provided at both ends of each reed switch, and each pin terminal is plugged into the electronic control board to enable the reed switches to be connected in parallel, which is conducive to achieving electrical connection between the relay and the switch unit, and the reed switch can be fixed relative to the relay by plugging into the electronic control board, without the need for other fixing structures, and the structure is simpler. One of the reed switches is attached to the electronic control board, and the structure of the switch unit is more stable.

[0029] Technical solution eleven has the technical advantages of technical solution nine. Since the first wall is perpendicular to the Z-axis direction, the external magnetic field can basically only approach the safety device along the Z-axis direction or in a direction inclined relative to the Z-axis direction. Therefore, even if the switch unit only includes two vertically crossed reed switches, since the switch unit is located on one side of the relay along the X-axis direction or the Y-axis direction, the length of the switch assembly of the relay and the reed switch combination along the Z-axis direction is relatively small. Therefore, the magnetic field direction of the external magnetic field moving along the X-axis direction or the Y-axis direction will also be blocked by the first wall and cannot be completely parallel to the intersection axis of the two vertically intersecting reed switches. Therefore, even if the switch unit only includes two vertically crossed reed switches, it can ensure that when the external magnetic field approaches the safety device, the switch unit is closed before the relay is abnormally disconnected, thereby ensuring that the safety door is normally closed and improving safety. The outer shell is arranged outside the relay and the switch unit. The outer shell can protect the relay and the switch unit, and can also shield the external magnetic field to a certain extent, reducing the influence of the external magnetic field.

[0030] Technical solution 12 has the technical advantages of technical solution 10. In this embodiment, no matter in which direction the external magnetic field approaches the safety device, the switch unit can basically close before the relay is abnormally disconnected, thereby ensuring that the safety door is normally closed and improving safety. The outer shell is arranged outside the relay and the switch unit. The outer shell can protect the relay and the switch unit, and can also shield the external magnetic field to a certain extent, reducing the impact of the external magnetic field. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is a schematic diagram of a switch assembly and a housing according to Example 1 of the present application;

[0033] Figure 2 This is a three-dimensional exploded view of the switch assembly and housing of Example 1 of the present application;

[0034] Figure 3 A side view of the switch assembly of Example 1 of the present application;

[0035] Figure 4 A top view of the switch assembly of Example 1 of the present application;

[0036] Figure 5 It is a schematic diagram of a third closed area and a fourth closed area around the reed switch when the direction of the external magnetic field is perpendicular to the reed switch and perpendicular to the movement of the reed switch in Example 1 of the present application;

[0037] Figure 6 It is a schematic diagram of the third closed area and the fourth closed area around the reed switch when the direction of the external magnetic field is parallel to the reed switch and moves parallel to the reed switch in Example 1 of the present application;

[0038] Figure 7 It is a schematic diagram of a first closed area around a switch unit when two reed switches are placed vertically and crosswise in Example 1 of the present application and the direction of the external magnetic field is parallel to one of the reed switches and moves in a direction parallel to the reed switch;

[0039] Figure 8 This is a schematic diagram of a safety device installed on a first wall in Example 1 of the present application;

[0040] Fig. 9 A side view of a switch assembly according to Embodiment 2 of the present application;

[0041] Fig.10 This is a top view of the switch assembly of Example 2 of the present application.

[0042] Description of main reference numerals:

[0043] Relay 10 ; relay body 11 ; connection terminal 111 ; shielding cover 12 ; switch unit 20 ; reed switch 21 ; pin terminal 22 ; third area 01 ; fourth area 02 ; electric control board 30 ; housing 40 ; first wall 50 . DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other 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.

[0045] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0046] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present invention.

[0047] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0048] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0049] "Normal working state" means "no external magnetic field passes or the magnetic field strength of the external magnetic field is very weak, and the impact on the switch component can be ignored"; "the reed switches 21 are placed crosswise with each other" means "the projection of the intersection point of each reed switch is located on the corresponding reed switch rather than on the extension line of the reed switch along its extension direction."

[0050] In the claims and the specification except for the embodiments, the terms "X-axis direction", "Y-axis direction" and "Z-axis direction" only mean that the feature with one of the above directions is perpendicular to the feature with another direction, and do not require that they must be implemented according to the "X-axis direction", "Y-axis direction" and "Z-axis direction" described in the embodiments. In the embodiments, the X-axis direction is perpendicular to the Y-axis direction and the Z-axis direction. Among them, the X-axis direction can be divided into left and right, the Y-axis direction can be divided into front and back, and the Z-axis direction can be divided into top and bottom.

[0051] Example 1

[0052] See also Figure 1-7 , Figure 1-7 A switch assembly is shown, including a relay 10 , a switch unit 20 and an electric control board 30 .

[0053] See also Figure 1The relay 10 and the switch unit 20 are connected in parallel and configured such that the relay 10 is closed and the switch unit 20 is open in a normal working state. In this embodiment, the relay 10 and the switch unit 20 are both electrically connected to the electric control board 30 to realize parallel connection.

[0054] See also Figure 2 , the relay 10 includes a relay body 11 and a shielding cover 12 that is arranged outside the relay body 11, the relay body 11 includes a fixed part and a moving part, the moving part moves relative to the fixed part and has at least a moving component in the Z-axis direction; in actual application, the fixed part includes a housing, a coil assembly and a static contact, the moving part includes an armature assembly and a moving contact that are fixed to each other, when the coil of the coil assembly is not energized, the armature assembly remains in a position where the moving contact and the static contact are disconnected, when the coil of the coil assembly is energized, the armature assembly is driven to move so that the moving contact and the static contact are closed. In this embodiment, the relay 10 is a seesaw relay 10, the relay body 11 is provided with a connecting terminal 111 that is electrically connected to the electric control board 30, the connecting terminal 111 in this embodiment is mainly a coil terminal of the coil assembly, a static lead-out terminal of the static contact and a moving lead-out terminal of the moving contact, in this embodiment, the length direction of the relay 10 is the X-axis direction, and the width direction of the armature is the Y-axis direction. However, it should be understood that in other embodiments, the relay 10 may also be a snap-on relay, a swing relay, or a direct-acting relay, as long as the moving part has at least a moving component in the Z-axis direction.

[0055] See also Figure 3-4 The switch unit 20 is placed close to the relay 10 and includes at least one reed switch 21. The switch unit 20 is located on one side of the relay 10 along the X-axis direction or the Y-axis direction. In this embodiment, the switch unit 20 is located on one side of the relay 10 along the Y-axis direction. The switch unit 20 is adapted to be closed when an external magnetic field passes through a first area around it; the relay 10 is adapted to be disconnected when an external magnetic field passes through a second area around it; the first area and the second area at least partially overlap to keep the switch assembly closed.

[0056] See also Figure 5-6 Each reed switch 21 is adapted to be closed when the external magnetic field passes through the third region 01 around it, and remain open when the external magnetic field passes through the fourth region 02 around it, and the third region 01 and the fourth region 02 are arranged along the circumference of the reed switch 21; when the number of the reed switches 21 is at least two, see Figure 7 , the reed switches 21 are connected in parallel and placed crosswise with each other so that the fourth region 02 of one of the two intersecting reed switches 21 at least partially overlaps with the third region 01 of the other reed switch 21. In this embodiment, there are only two reed switches 21, and the two reed switches 21 cross each other perpendicularly, and the intersection axis of the two reed switches 21 is perpendicular to the Z-axis direction. Figure 3-4In the embodiment, the cross axis is parallel to the Y-axis direction and is located in the middle of the relay 10, where the middle is close to the center point of the relay 10. In this embodiment, the two reed switches 21 are inclined relative to the Z-axis direction. Pin terminals 22 are respectively provided at both ends of each reed switch 21, and each pin terminal 22 is plugged into the electric control board 30 so that each reed switch 21 is connected in parallel.

[0057] In this embodiment, since the moving part moves relative to the fixed part and has at least a moving component in the Z-axis direction, when the direction of the external magnetic field is in the Z-axis direction, it is easier to cause abnormal movement of the moving part, thereby causing the relay 10 to be abnormally disconnected. In this embodiment, the switch unit 20 includes a relay 10 and a switch unit 20 connected in parallel with each other. The switch unit 20 and the relay 10 are configured such that the relay 10 is closed and the switch unit 20 is disconnected under normal working conditions, so that the switch assembly remains closed under normal working conditions and is only disconnected when the relay 10 is driven to disconnect by an external instruction. In which, the switch unit 20 is separated from the relay body 11 by a shielding cover 12, thereby avoiding the influence of the magnetic field of the relay body 11 itself on the switch unit 20; the switch unit 20 is placed close to the relay 10 and includes at least one reed switch 21, and the switch unit 20 is suitable for closing when the external magnetic field passes through a first area around it; the relay 10 is suitable for disconnecting when the external magnetic field passes through a second area around it; the first area and the second area at least partially overlap to keep the switch assembly closed; since the sensitivity of the reed switch 21 to the external magnetic field is higher than the sensitivity of the relay 10 to the external magnetic field strength, the switch unit 20 is placed close to the relay 10 to make the reed switch 21 close to the relay 10. The reed switch 21 is affected by the external magnetic field before the relay 10. Since the first area and the second area at least partially overlap, the switch unit 20 can be closed before the relay 10 is abnormally disconnected due to the external magnetic field. When the external magnetic field passes, the switch unit 20 switches to the closed state earlier. At this time, even if the relay 10 is also switched to the disconnected state, the switch assembly can still remain in the closed state, thereby improving the safety and reliability of the switch assembly when used; each reed switch 21 is suitable for closing when the external magnetic field passes through the third area 01 around it, and remaining disconnected when the external magnetic field passes through the fourth area 02 around it. The third area The first region 01 and the fourth region 02 are arranged along the circumference of the reed switch 21; when the number of the reed switches 21 is at least two, the reed switches 21 are connected in parallel and placed crosswise with each other so that the fourth region 02 of one of the two intersecting reed switches 21 at least partially overlaps with the third region 01 of the other reed switch 21, which can increase the space of the first region when the external magnetic field passes through the switch unit 20. The parallel connection of the reed switches 21 increases the probability that at least one reed switch 21 can be switched to a closed state, thereby increasing the sensitivity range of the switch unit 20 to the external magnetic field, thereby improving the safety and reliability of the switch assembly when it is used.

[0058] In this embodiment, when the number of the reed switches 21 is at least two, at least two of the reed switches 21 are perpendicularly crossed with each other. Compared with only two of the reed switches 21 being obliquely crossed, the overlapping space between the fourth area 02 of the two perpendicularly crossed reed switches 21 and the third area 01 of the other reed switch 21 is increased, which can further increase the space of the first area when the external magnetic field passes through the switch unit 20, thereby further improving the sensitivity range of the switch unit 20 to the external magnetic field, thereby improving the safety and reliability of the switch assembly during application.

[0059] In this embodiment, since the switch unit 20 only includes two vertically crossed reed switches 21, the switch unit 20 remains disconnected only when the direction of the external magnetic field is parallel to the direction of the cross axis and the external magnetic field approaches the switch unit 20 along the cross axis. In other cases, the switch unit 20 will be closed when the external magnetic field passes through the first area around it, and the relay body 11 will abnormally switch to the disconnected state only when the external magnetic field approaches the relay 10 mainly along the Z-axis direction. Therefore, in this embodiment, the switch unit 20 is located on one side of the relay 10 along the X-axis direction or the Y-axis direction, and the reed switch 21 is There are only two reed switches 21, and the intersection axis of the two reed switches 21 is perpendicular to the Z-axis direction, so that the external magnetic field that cannot close the switch unit 20 has a smaller impact on the relay body 11, while the external magnetic field that affects the relay body 11 can affect the switch unit 20, thereby ensuring that when the space in the first area is large, the external magnetic field that affects the relay body 11 will first act on the switch unit 20, so that the switch unit 20 is closed before the relay 10 is abnormally disconnected, ensuring that the switch assembly remains in a closed state, thereby improving the safety and reliability of the switch assembly when used. The switch unit 20 is located on one side of the relay 10 along the X-axis direction or the Y-axis direction, which is also conducive to reducing the space occupied by the switch assembly as a whole in the Z-axis direction, thereby facilitating the flattening of the switch assembly.

[0060] In this embodiment, the length direction of the relay 10 is the X-axis direction, the moving part includes the armature, and the width direction of the armature is the Y-axis direction; the switch unit 20 is located on one side of the relay 10 along the Y-axis direction, and the cross axis is parallel to the Y-axis direction and is located in the middle of the relay 10. Compared with the switch unit 20 being located on one side of the relay 10 along the X-axis direction, the overlapping space between the first area and the second area can be further increased, thereby improving the safety and reliability of the switch assembly during application.

[0061] In this embodiment, both reed switches 21 are inclined relative to the Z-axis direction. Compared with the solution in which one of the reed switches 21 extends along the Z-axis direction, it is more conducive to increasing the length of the reed switch 21 under the condition that the length of the switch assembly along the Z-axis direction is constant, thereby increasing the space of the first area and increasing the overlapping space between the first area and the second area, further ensuring that the switch assembly can remain in a closed state even when an external magnetic field passes through, thereby improving the safety and reliability of the switch assembly during application.

[0062] In this embodiment, the relay 10 and the switch unit 20 are both electrically connected to the electric control board 30 to achieve parallel connection, and the electrical connection is reliable; pin terminals 22 are respectively provided at both ends of each reed switch 21, and each pin terminal 22 is plugged into the electric control board 30 so that each reed switch 21 is connected in parallel, which is conducive to achieving the electrical connection between the relay 10 and the switch unit 20, and the reed switch 21 can be fixed relative to the relay 10 by plugging into the electric control board 30, without the need for other fixing structures, and the structure is simpler.

[0063] See also Figure 8 This embodiment also provides a safety device for controlling the access control of the security door and for being installed on a fixed first wall 50, the first wall 50 being perpendicular to the Z-axis direction. In practical applications, the first wall 50 may be a wall or a fixed door. The safety device uses the above switch assembly and further includes a housing 40, which is disposed outside the relay 10 and the switch unit 20. In this embodiment, the length of the safety device along the Z-axis direction is less than 20 mm.

[0064] In this embodiment, since the first wall 50 is perpendicular to the Z-axis direction, the external magnetic field can basically only approach the safety device along the Z-axis direction or in a direction inclined relative to the Z-axis direction. Therefore, even if the switch unit 20 only includes two vertically crossed reed switches 21, since the switch unit 20 is located on one side of the relay 10 along the X-axis direction or the Y-axis direction, the length of the switch assembly composed of the relay 10 and the reed switch 21 along the Z-axis direction is relatively small, so the magnetic field direction of the external magnetic field moving along the X-axis direction or the Y-axis direction will also be blocked by the first wall 50 and cannot be completely parallel to the intersection axis of the two vertically intersecting reed switches 21. Therefore, even if the switch unit 20 only includes two vertically crossed reed switches 21, it can be ensured that when the external magnetic field approaches the safety device, the switch unit 20 is closed before the relay 10 is abnormally disconnected, thereby ensuring the normal closure of the safety door and improving safety. The housing 40 is arranged outside the relay 10 and the switch unit 20. The housing 40 can protect the relay 10 and the switch unit 20, and can also shield the external magnetic field to a certain extent, reducing the influence of the external magnetic field.

[0065] Example 2

[0066] Example 2 is basically the same as Example 1, except that Figure 9-10 The number of the reed switches 21 is three, and the three reed switches 21 are perpendicular to each other. The switch unit 20 is located on one side of the relay 10 along the X-axis direction or the Y-axis direction. Figure 9-10 In the embodiment, the switch unit 20 is located on one side of the relay 10 along the Y-axis direction, and the extension direction of one of the reed switches 21 is perpendicular to the Z-axis direction. Figure 9-10 The reed switch 21 extends along the Y-axis direction, the intersection axes of the remaining two perpendicularly intersecting reed switches 21 are parallel to the reed switch 21, and the remaining two reed switches 21 are inclined relative to the Z-axis direction. Figure 9-10 The cross axis is parallel to the Y-axis direction and is located in the middle of the relay 10. The relay 10 and the switch unit 20 are both electrically connected to the electric control board 30 to achieve parallel connection; pin terminals 22 are respectively provided at both ends of each reed switch 21, and each pin terminal 22 is plugged into the electric control board 30 to make each reed switch 21 parallel; the reed switch 21 perpendicular to the Z-axis direction is close to the electric control board 30.

[0067] It can be seen from Embodiment 1 and Embodiment 2 that when the number of the reed switches 21 is at least two, at least two of the reed switches 21 are perpendicularly crossed to each other.

[0068] In the present embodiment, since the switch unit 20 includes only two perpendicularly intersecting reed switches 21, when the direction of the external magnetic field is parallel to the direction of the intersection axis and the external magnetic field approaches the switch unit 20 along the intersection axis, the switch unit 20 remains disconnected. In the present embodiment, the number of reed switches 21 is three, and the three reed switches 21 are perpendicular to each other. Therefore, when the direction of the external magnetic field is parallel to the intersection axis of two of the perpendicularly intersecting reed switches 21 and approaches the switch unit 20 along the intersection axis, the switch unit 20 can also be closed. That is to say, the third area 01 of the newly added reed switch 21 can partially overlap with the fourth area 02 of the other two reed switches 21, thereby further increasing the space of the first area of ​​the switch unit 20, increasing the overlapping space between the first area and the second area, further ensuring that the switch assembly can maintain its initial working state even when the external magnetic field passes through, and improving the safety and reliability of the switch assembly during application.

[0069] In this embodiment, the switch unit 20 is located on one side of the relay 10 along the X-axis direction or the Y-axis direction, and the extension direction of one of the reed switches 21 is perpendicular to the Z-axis direction, the intersection axes of the remaining two perpendicularly crossed reed switches 21 are parallel to the reed switch 21, and the remaining two reed switches 21 are inclined relative to the Z-axis direction, which is beneficial to reducing the space occupied by the entire switch assembly in the Z-axis direction, thereby facilitating the flattening of the switch assembly. Compared with the solution in which the extension directions of two reed switches 21 are perpendicular to the Z-axis direction, it is more beneficial to increase the length of the reed switch 21 under the condition that the length of the switch assembly along the Z-axis direction is constant, thereby increasing the space of the first area and increasing the overlapping space of the first area and the second area, further ensuring that the switch assembly can remain in a closed state even when an external magnetic field passes through, thereby improving the safety and reliability of the switch assembly during application.

[0070] In this embodiment, there are three reed switches 21, and the relay 10 and the switch unit 20 are both electrically connected to the electric control board 30 to achieve parallel connection, and the electrical connection is reliable; pin terminals 22 are provided at both ends of each reed switch 21, and each pin terminal 22 is plugged into the electric control board 30 so that each reed switch 21 is connected in parallel, which is conducive to achieving the electrical connection between the relay 10 and the switch unit 20, and the reed switch 21 can be fixed relative to the relay 10 by plugging into the electric control board 30, without the need for other fixing structures, and the structure is simpler. One of the reed switches 21 is attached to the electric control board 30, and the structure of the switch unit 20 is more stable.

[0071] The safety device in this embodiment is used to control the access control of the security door. The safety device adopts the above-mentioned switch assembly and also includes a housing 40, which is covered outside the relay 10 and the switch unit 20. In this embodiment, no matter in which direction the external magnetic field approaches the safety device, the switch unit 20 can basically be closed before the relay 10 is abnormally disconnected, thereby ensuring that the safety door is normally closed and improving safety. The housing 40 is covered outside the relay 10 and the switch unit 20. The housing 40 can protect the relay 10 and the switch unit 20, and can also shield the external magnetic field to a certain extent to reduce the impact of the external magnetic field.

[0072] Example 3

[0073] Embodiment 3 is substantially the same as Embodiment 1, except that there is only one reed switch 21 , and the reed switch 21 extends along the Z-axis direction and is located on one side of the relay 10 along the Y-axis direction.

[0074] When there is only one reed switch 21, the reed switch 21 extends along the Z-axis direction, which makes the reed switch 21 more susceptible to the external magnetic field with the magnetic field direction in the Z-axis direction, and thus easier to close when the external magnetic field is in the Z-axis direction, thereby keeping the switch assembly closed, and the setting of one reed switch 21 can more easily reduce production costs and assembly costs.

[0075] The description of the above specification and embodiments is used to explain the protection scope of the present invention, but does not constitute a limitation on the protection scope of the present invention. Through the enlightenment of the present invention or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent substitutions or other improvements to the embodiments of the present invention or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the present invention.

Claims

1. A switch assembly, characterized in that: It comprises a relay (10) and a switch unit (20) connected in parallel with each other, wherein the switch unit (20) and the relay (10) are configured such that in a normal working state, the relay (10) is closed and the switch unit (20) is opened; The relay (10) comprises a relay body (11) and a shielding cover (12) arranged outside the relay body (11); the relay body (11) comprises a fixed part and a moving part; the moving part moves relative to the fixed part and has at least a moving component in the Z-axis direction; The switch unit (20) is placed close to the relay (10) and comprises at least one reed switch (21), the switch unit (20) is adapted to be closed when an external magnetic field passes through a first area around the switch unit (20); the relay (10) is adapted to be disconnected when an external magnetic field passes through a second area around the switch unit (10); the first area and the second area at least partially overlap to keep the switch assembly closed; The dry reed spring (21) is configured to extend along the Z-axis direction when there is one dry reed spring (21).

2. A switch assembly as claimed in claim 1, characterized in that: Each reed switch (21) is adapted to be closed when an external magnetic field passes through a third region (01) around it, and remain open when an external magnetic field passes through a fourth region (02) around it, the third region (01) and the fourth region (02) being arranged along the circumference of the reed switch (21); when the number of the reed switches (21) is at least two, the reed switches (21) are connected in parallel and placed crosswise with each other so that the fourth region (02) of one of the two intersecting reed switches (21) at least partially overlaps with the third region (01) of the other reed switch (21).

3. A switch assembly as claimed in claim 2, characterized in that: The number of the reed switches (21) is at least two, and at least two of the reed switches (21) in each reed switch (21) are perpendicularly intersected with each other.

4. A switch assembly as claimed in claim 3, characterized in that: The switch unit (20) is located on one side of the relay (10) along the X-axis direction or the Y-axis direction; the number of the reed switches (21) is only two, and the intersection axis of the two reed switches (21) is perpendicular to the Z-axis direction.

5. A switch assembly as claimed in claim 4, characterized in that: The length direction of the relay (10) is the X-axis direction, the moving part includes an armature, and the width direction of the armature is the Y-axis direction; the switch unit (20) is located on one side of the relay (10) along the Y-axis direction, and the cross axis is parallel to the Y-axis direction and is located in the middle of the relay (10).

6. A switch assembly as claimed in claim 5, characterized in that: Both reed switches (21) are inclined relative to the Z-axis direction.

7. A switch assembly as claimed in claim 3, characterized in that: The number of the reed switches (21) is three, and the three reed switches (21) are perpendicularly intersected with each other.

8. A switch assembly as claimed in claim 7, characterized in that: The switch unit (20) is located on one side of the relay (10) along the X-axis direction or the Y-axis direction, and the extension direction of one of the reed switches (21) is perpendicular to the Z-axis direction, the intersection axes of the remaining two perpendicularly intersecting reed switches (21) are parallel to the reed switch (21), and the remaining two reed switches (21) are inclined relative to the Z-axis direction.

9. A switch assembly according to any one of claims 4 to 6, characterized in that: It also includes an electric control board (30), the relay (10) and the switch unit (20) are electrically connected to the electric control board (30) to achieve parallel connection; each reed switch (21) is provided with pin terminals (22) at both ends, and each pin terminal (22) is plugged into the electric control board (30) to enable the two reed switches (21) to be connected in parallel.

10. A switch assembly according to claim 7 or 8, characterized in that: It also includes an electric control board (30), the relay (10) and the switch unit (20) are electrically connected to the electric control board (30) to achieve parallel connection; pin terminals (22) are respectively provided at both ends of each reed switch (21), and each pin terminal (22) is plugged into the electric control board (30) so that three reed switches (21) are connected in parallel; and one of the reed switches (21) is attached to the electric control board (30).

11. A safety device for controlling access to a safety door and for installation on a fixed first wall (50), the first wall (50) being perpendicular to the Z-axis direction, characterized in that: The safety device adopts the switch assembly according to claim 9 and further comprises a housing (40), wherein the housing (40) is arranged outside the relay (10) and the switch unit (20).

12. A security device for controlling access to a security door, characterized in that: The safety device adopts the switch assembly described in claim 10 and further comprises a housing (40), wherein the housing (40) is disposed outside the relay (10) and the switch unit (20).

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