Bidirectional holding type reed switch

Abstract

The utility model discloses a bidirectional holding type reed switch, which comprises a switch body, a first pin, a second pin and a third pin, when the reed switch is in a first state, the first end of the first pin is connected with the first end of the second pin, and when the reed switch is in a second state, the first end of the first pin is attracted with the first end of the third pin; when the reed pipe is subjected to an external magnetic field to enhance the magnetic field in the pipe body, the reed pipe is switched from the first state to the second state, and when the reed pipe is subjected to the external magnetic field to weaken the magnetic field in the pipe body, the reed pipe is switched from the second state to the first state. Therefore, the reed pipe can be triggered under the action of an external magnetic field, the magnetic field intensity in the pipe body can be changed by applying the external magnetic fields in different directions, the reed pipe can generate different triggering states, and the current triggering state can be kept after the external magnetic field disappears. The method can be applied to occasions needing to monitor and record the direction or frequency of mutual movement between two objects.

Description

Technical Field

[0001] The utility model relates to the technical field of reed switches, in particular to a bidirectional holding type reed switch. Background Art

[0002] Reed switches generally have normally open, normally closed or bidirectional holding types. These reed switches in the prior art have a characteristic, that is, to maintain the triggered state of the reed switch, the external triggering magnetic field must continue to exist. Once the external triggering magnetic field disappears, the reed switch will instantly return to its original state before triggering and cannot maintain the current triggered state. Therefore, it cannot be used in situations where it is necessary to monitor and record the direction or number of times two objects move relative to each other. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a bidirectional holding type reed switch, which can be used in situations where it is necessary to monitor and record the direction or number of times two objects move relative to each other.

[0004] To solve the above problems, the technical solution adopted by the utility model is as follows: a bidirectional holding reed switch, comprising a tube body, a first pin, a second pin and a third pin, wherein the first ends of the first pin, the second pin and the third pin are all located in the tube body; the reed switch has a first state and a second state: when the reed switch is in the first state, the first end of the first pin is connected to the first end of the second pin, and when the reed switch is in the second state, the first end of the first pin is attracted to the first end of the third pin; there is a first magnetic field in the tube body, when the reed switch is not affected by an external magnetic field, the reed switch can remain in the current state, when the reed switch is affected by an external magnetic field, the superposition of the external magnetic field and the first magnetic field can cause the magnetic field strength in the tube body to change, when the magnetic field in the tube body is enhanced, the reed switch switches from the first state to the second state, and when the magnetic field in the tube body is weakened, the reed switch switches from the second state to the first state.

[0005] Compared with the prior art, the beneficial effect of the utility model is that: when the reed switch is not affected by the external magnetic field, that is, only affected by the first magnetic field, the reed switch can remain in the current state, so the reed switch can always remain in the initial state when not in use; when the reed switch is driven by the external magnetic field to enhance the magnetic field inside the tube body, the reed switch is converted from the first state to the second state, that is, the first end of the first pin is attracted to the first end of the third pin, and after the external magnetic field disappears, the reed switch remains in the second state; when the reed switch is driven by the external magnetic field to weaken the magnetic field inside the tube body, the reed switch is converted from the second state to the first state, that is, the first end of the first pin is connected to the first end of the second pin, and after the external magnetic field disappears, the reed switch remains in the first state. Therefore, the reed switch can be triggered by the external magnetic field. The external magnetic field in different directions can be applied to the reed switch to change the magnetic field strength inside the tube body, thereby causing the reed switch to produce different trigger states. The reed switch can also maintain the current trigger state after the external magnetic field disappears. It can be used in situations where it is necessary to monitor and record the direction or number of mutual movements between two objects. For example, the reed switch is placed in the first object and the external magnet is placed in the second object. The different movement directions of the external magnet can produce different trigger states for the reed switch. The direction or number of mutual movements between the first object and the second object can be determined through the trigger state and state conversion number of the reed switch.

[0006] In the above-mentioned bidirectional holding reed switch, the first ends of the first pin and the third pin are both made of magnetic conductive materials, and the first end of the second pin is made of non-magnetic conductive materials; initially, the reed switch is in the first state.

[0007] In the above-mentioned bidirectional holding type reed switch, the first pin, the second pin and the third pin all include a spring portion and a protruding portion, the spring portion is located inside the tube body, and the protruding portion protrudes outside the tube body.

[0008] In the above-mentioned bidirectional holding type reed switch, the extending portion of the first pin extends out of the first end of the tube body, and the extending portions of the second pin and the third pin both extend out of the second end of the tube body.

[0009] In the above-mentioned bidirectional holding type reed switch, a magnetic component is connected to the tube body, and the magnetic component is used to apply a first magnetic field to the inside of the tube body.

[0010] In the above-mentioned bidirectional holding reed switch, the magnetizing direction of the magnetic component is parallel to the axial direction of the tube body.

[0011] In the above-mentioned bidirectional holding reed switch, the first pin is a common end, and the second pin and the third pin are a normally closed end and a normally open end respectively.

[0012] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the reed switch of an embodiment of the utility model;

[0014] Figure 2 A cross-sectional view of the reed switch of the utility model embodiment in the first state;

[0015] Figure 3 This is a cross-sectional view of the reed switch according to an embodiment of the utility model in the second state.

[0016] Description of the accompanying drawings: 100 tube body, 200 first pin, 300 second pin, 400 third pin, 500 magnetic component. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below. Figures 1 to 3 The embodiment of the utility model provides a bidirectional holding type reed switch, including a tube body 100, a first pin 200, a second pin 300 and a third pin 400, such as Figure 2 and Figure 3 As shown, the first ends of the first pin 200 , the second pin 300 and the third pin 400 are all located in the tube body 100 . The reed switch has a first state and a second state: when the reed switch is in the first state, the first end of the first pin 200 is connected to the first end of the second pin 300; when the reed switch is in the second state, the first end of the first pin 200 is attracted to the first end of the third pin 400; there is a first magnetic field in the tube body 100; when the reed switch is not affected by the external magnetic field, the reed switch can remain in the current state; when the reed switch is affected by the external magnetic field, the external magnetic field will be superimposed on the first magnetic field, thereby changing the magnetic field strength in the tube body 100; when the intensity direction of the external magnetic field is the same as the intensity direction of the first magnetic field, the magnetic field strength in the tube body 100 will increase; when the intensity direction of the external magnetic field is opposite to the intensity direction of the first magnetic field, the magnetic field strength in the tube body 100 will weaken; when the reed switch is affected by the external magnetic field to enhance the magnetic field in the tube body 100, the reed switch is switched from the first state to the second state; when the reed switch is affected by the external magnetic field to weaken the magnetic field in the tube body 100, the reed switch is switched from the second state to the first state.

[0018] When the reed switch is not affected by the external magnetic field, that is, only affected by the first magnetic field, the reed switch can maintain the current state. Therefore, when the reed switch is not in use, it is not driven by the external magnetic field and can always maintain the initial state. For example, Figure 2As shown in , the first end of the first pin 200 is connected to the first end of the second pin 300. When the reed switch is driven by an external magnetic field to enhance the magnetic field in the tube body 100, the reed switch is switched from the first state to the second state, that is, Figure 3 As shown in , the first end of the first pin 200 is attracted to the first end of the third pin 400, and after the external magnetic field disappears, the reed switch remains in the second state. When the reed switch is driven by the external magnetic field to weaken the magnetic field in the tube body 100, the reed switch is converted from the second state to the first state, that is, the first end of the first pin 200 is connected to the first end of the second pin 300, and after the external magnetic field disappears, the reed switch remains in the first state.

[0019] Therefore, the reed switch can be triggered by the external magnetic field, thereby switching from the open state to the closed state, or from the closed state to the open state. The external magnetic field in different directions can also be applied to the reed switch to change the magnetic field strength in the tube body 100, so that the reed switch produces different triggering states. For example, when the intensity direction of the external magnetic field is the same as the intensity direction of the first magnetic field, the magnetic field strength in the tube body 100 is increased, so that the reed switch switches from the first state to the second state, and after the external magnetic field disappears, the reed switch remains in the second state. When the intensity direction of the external magnetic field is opposite to the intensity direction of the first magnetic field, the magnetic field strength in the tube body 100 will weaken, so that the reed switch switches from the second state to the first state, and after the external magnetic field disappears, the reed switch remains in the first state. The reed switch can be used in situations where it is necessary to monitor and record the direction or number of mutual movements between two objects. For example, the reed switch is placed in a first object and an external magnet is placed in a second object. The different movement directions of the external magnet can produce different triggering states for the reed switch. The direction or number of mutual movements between the first object and the second object can be determined through the triggering state and the number of state transitions of the reed switch.

[0020] Furthermore, the tube body 100 can be made of glass material, and a magnetic component 500 can be connected to the tube body 100. The magnetic component 500 is used to apply the required first magnetic field to the inside of the tube body 100. Of course, in some other embodiments, the first magnetic field can also be generated by other methods. The method of using the magnetic component 500 can be easy to integrate so as to generate the required first magnetic field in the tube body 100. The magnetic component 500 can be a structure such as a magnet, and the magnetic component 500 can be fixedly connected to the outside of the tube body 100 by means of glue bonding or heat shrink tube coating. The magnetization direction of the magnetic component 500 is parallel to the axial direction of the tube body 100, and a stable first magnetic field can be generated, so as to change the magnetic field strength in the tube body 100 by applying an external magnetic field.

[0021] Furthermore, the first pin 200 is a common terminal, the second pin 300 and the third pin 400 are respectively a normally closed terminal and a normally open terminal, and the first pin 200, the second pin 300 and the third pin 400 all include a spring portion and a protruding portion, the spring portion is located inside the tube body 100, and is used to achieve a lap connection or a pull-in connection, and the protruding portion extends outside the tube body 100, and is used to connect to a user circuit. The protruding portion of the first pin 200 extends from the first end of the tube body 100, and the protruding portions of the second pin 300 and the third pin 400 both extend from the second end of the tube body 100, so as to achieve connection with the user circuit at both ends of the tube body 100.

[0022] Furthermore, the first ends of the first pin 200 and the third pin 400 are both made of magnetic conductive material, and the first end of the second pin 300 is made of non-magnetic conductive material; initially, the reed switch is in the first state, that is, Figure 2 As shown in , the first end of the first pin 200 overlaps with the first end of the second pin 300. The connection state is determined by the shape and position of the first pin 200 and the second pin 300. The first pin 200 can be set closer to the second pin 300, so that the first end of the first pin 200 can overlap with the first end of the second pin 300. At this time, the reed switch is in a normally closed state. The first magnetic field applied by the magnetic component 500 to the inside of the tube body 100 needs to be set within a suitable intensity range. Within this intensity range, the first magnetic field is not enough to deform the first pin 200 and separate from the third pin 400. However, when the first pin 200 and the third pin 400 are attracted, the first magnetic field can keep the first pin 200 and the third pin 400 in the attracted state. When subjected to the opposite external magnetic field, the magnetic field in the tube body 100 weakens. At this time, the first pin 200 will separate from the third pin 400 and overlap with the second pin 300 again under the action of the deformation recovery force.

[0023] Specifically, taking the magnetic field strength that can just drive the spring parts of the first pin 200 and the third pin 400 to attract each other as the standard, the strength of the first magnetic field is slightly lower than the standard, that is, the strength of the first magnetic field is sufficient to keep the first pin 200 and the third pin 400 in a mutually attracted state, but it is not as strong as the magnetic field strength that can convert the first pin 200 and the third pin 400 that were originally not attracted to the attracted state. Only when an external magnetic field with the same direction as the first magnetic field strength is superimposed to enhance the magnetic field strength in the tube body 100, can the first pin 200 be separated from the second pin 300 and then be attracted and connected with the third pin 400.

[0024] For the external magnetic field, a magnet can be used to apply it. When the magnet moves outside the tube body 100 and approaches the tube body 100, the external magnetic field can be applied to the tube body 100, and when the magnet moves away from the tube body 100, the external magnetic field disappears. The driving magnet can be driven in a unipolar manner or in a bipolar manner, and the specific selection can be made according to actual needs. For example, in the case of counting, unipolar driving can be used, and in the case of judging the direction, bipolar driving can be used.

[0025] Reference Figure 2 When the reed switch is in the first state, the first pin 200 and the second pin 300 are overlapped. Although there is magnetic attraction between the first pin 200 and the third pin 400, and there is a tendency for them to attract each other, the first magnetic field is not strong enough, so the first pin 200 will not be separated from the second pin 300. Specifically, the shape and position between the first pin 200 and the second pin 300 can be set so that the deformation force required by the first pin 200 is greater than the magnetic attraction under the action of the first magnetic field. Therefore, when only the first magnetic field is applied, the magnetic attraction is less than the deformation force, and the first pin 200 will not be deformed, that is, it will not be separated from the second pin 300. Figure 3 When the strength direction of the applied external magnetic field is the same as the strength direction of the first magnetic field, the magnetic field strength in the tube body 100 increases, and the magnetic attraction force is greater than the deformation force. At this time, the first pin 200 will be separated from the second pin 300 and connected to the third pin 400, and the reed switch will be converted from the first state to the second state. When the external magnetic field disappears, that is, when the external magnet leaves, due to the hysteresis phenomenon, the first pin 200 will remain in the state of being attracted and connected to the third pin 400, so the reed switch can still remain in the second state. When an external magnetic field with a direction opposite to the intensity of the first magnetic field is applied again, the magnetic field intensity in the tube body 100 weakens. At this time, the magnetic attraction force on the first pin 200 is smaller than the deformation force, and the first pin 200 cannot maintain the deformed state and will return to its original state. That is, the first pin 200 will be separated from the third pin 400 and re-connected with the second pin 300. The reed switch is converted from the second state to the first state. When the external magnetic field disappears, that is, when the external magnet leaves, the magnetic attraction force is still smaller than the deformation force, and the first pin 200 remains overlapped with the second pin 300, and the reed switch continues to remain in the first state.

[0026] It should be noted that in the description of the present invention, if there are any orientation descriptions, such as up, down, front, back, left, right, etc., the orientations or positional relationships indicated are all based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and cannot be understood as a limitation on the present invention.

[0027] In the description of the present utility model, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0029] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A bidirectional holding reed switch, characterized in that: It comprises a tube body (100), a first pin (200), a second pin (300) and a third pin (400), wherein the first ends of the first pin (200), the second pin (300) and the third pin (400) are all located inside the tube body (100); The reed switch has a first state and a second state: when the reed switch is in the first state, the first end of the first pin (200) is connected to the first end of the second pin (300); when the reed switch is in the second state, the first end of the first pin (200) is attracted to the first end of the third pin (400); The tube body (100) has a first magnetic field in it. When the reed switch is not affected by an external magnetic field, the reed switch can remain in a current state. When the reed switch is affected by an external magnetic field, the superposition of the external magnetic field and the first magnetic field can cause the magnetic field intensity in the tube body (100) to change. When the magnetic field in the tube body (100) increases, the reed switch switches from the first state to the second state. When the magnetic field in the tube body (100) decreases, the reed switch switches from the second state to the first state.

2. The bidirectional holding reed switch according to claim 1, characterized in that: The first ends of the first pin (200) and the third pin (400) are both made of magnetic conductive material, and the first end of the second pin (300) is made of non-magnetic conductive material.

3. The bidirectional holding reed switch according to claim 1, characterized in that: The first pin (200), the second pin (300) and the third pin (400) all comprise a spring portion and a protruding portion, the spring portion being located inside the tube body (100) and the protruding portion being protruding outside the tube body (100).

4. The bidirectional holding type reed switch according to claim 3, characterized in that: The protruding portion of the first pin (200) protrudes from the first end of the tube body (100), and the protruding portions of the second pin (300) and the third pin (400) both protrude from the second end of the tube body (100).

5. The bidirectional holding reed switch according to claim 1, characterized in that: The tube body (100) is connected to a magnetic component (500), and the magnetic component (500) is used to apply a first magnetic field to the inside of the tube body (100).

6. The bidirectional holding reed switch according to claim 5, characterized in that: The magnetization direction of the magnetic component (500) is parallel to the axial direction of the tube body (100).

7. The bidirectional holding reed switch according to claim 1, characterized in that: The first pin (200) is a common terminal, and the second pin (300) and the third pin (400) are a normally closed terminal and a normally open terminal respectively.

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