Relay contact structure suitable for small load working condition and relay
Patent Information
- Application Number
- CN202420944493.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-04-30
AI Technical Summary
In the low-load conditions and low-temperature environment, the plane contact or spherical contact structures of existing relays are prone to failure of contacts due to the large contact area of the contact, especially the ice film on the contact surface is difficult to break under low temperature conditions.
A relay contact structure suitable for small load conditions is designed. By providing a contact protrusion on the first contact point and/or the second contact point, the contact area of the contact part is reduced, and the minimum area contact between the two contact points is achieved.
It effectively reduces the area of ice film required for contact conduction in low-temperature environments, reduces the probability of contact failure, and improves the reliability and stability of the relay under low-temperature and low load conditions.
Smart Images
Figure CN222637170U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of relays, and in particular to a relay contact structure and a relay suitable for small load working conditions. Background Art
[0002] In the existing relay field, the contact area is generally increased by increasing the contact line contact or surface contact, or by increasing the number of contact points, so as to reduce contact resistance, reduce heat, reduce temperature rise, and increase the service life of the relay.
[0003] Under small load application conditions, the load voltage is low, the ability of the contacts to break the surface film resistance is low, and foreign matter at the contact position has a greater impact on the reliability of the contact connection.
[0004] In low-temperature environments, when the existing flat contact or spherical contact structure is in the open state and the temperature drops below zero, a layer of ice will condense on the contact surface. Because the contact area is large, a large area of ice film needs to be broken when the contact is closed to conduct. If the contact is closed and the temperature drops below zero, the contact area is large, and the contact surface and the small contact gap are more likely to condense water vapor due to surface energy and surface tension, resulting in a thicker ice layer. Therefore, the existing conventional flat contact and spherical contact structures have a higher probability of contact failure when used under low-temperature and low-load conditions because of their large contact area.
[0005] In addition, non-conductive foreign matter (such as plastic chips, fiber filaments, etc.) generated by friction between groups during relay assembly and relay operation may be transferred to the contact surface. The existing contact structure has a large contact area, and the probability of contact resistance increasing or even contact failure due to non-conductive foreign matter on the contact is high. Utility Model Content
[0006] In view of the deficiencies in the prior art, the utility model provides a relay contact structure suitable for small load conditions, which mainly solves the technical problem that the existing conventional planar contact or spherical contact structure has a large contact area and a high probability of contact failure due to non-conductive foreign matter on the contact surface under small load conditions.
[0007] In order to achieve the above object, the utility model is realized by the following technical solutions:
[0008] A relay contact structure suitable for light load working conditions comprises a first contact and a second contact. The first contact and / or the second contact is provided with an abutment convex portion for reducing the contact area between the first contact and the second contact in a closed state.
[0009] Furthermore, both the first contact point and the second contact point are provided with abutment protrusions.
[0010] Furthermore, the abutting convex portion is a long strip convex rib structure, and the protruding apex of the long strip convex rib structure is in a smooth transition shape.
[0011] Furthermore, the interference protrusion arranged on the first contact is located at the center position of the contact surface of the first contact, and the interference protrusion arranged on the second contact is located at the center position of the contact surface of the second contact, and when the first contact and the second contact cooperate with each other to form a closed state, the interference protrusion on the first contact and the interference protrusion on the second contact are configured to be non-parallel, cross-angled, and interference-fitting.
[0012] Furthermore, the intersecting angular interference angle between the interfering protrusion on the first contact and the interfering protrusion on the second contact when the first contact and the second contact form a closed state is defined as A, and then 0°<A<180°.
[0013] Furthermore, A=90° is configured so that when the first contact and the second contact form a closed state, the interfering protrusion on the first contact and the interfering protrusion on the second contact are interferingly matched in a cross shape to achieve minimum contact area between the two interfering protrusions.
[0014] Furthermore, a step-change large gap is formed between the first contact and the second contact at positions around the interfering matching portion between the interfering protrusion on the first contact and the interfering protrusion on the second contact.
[0015] Furthermore, the first contact is one of the static contact structure and the moving contact structure, the second contact is the other of the static contact structure and the moving contact structure, and the first contact is a planar contact structure or a spherical contact structure, while the second contact is a planar contact structure or a spherical contact structure.
[0016] Based on the same inventive concept, the utility model also provides a relay, comprising any of the above-mentioned relay contact structures suitable for small load conditions.
[0017] Furthermore, the relay is a safety relay or a relay with auxiliary contacts or a signal relay that uses contacts to switch small load voltage and current in a low temperature environment.
[0018] The above technical solution has the following advantages or beneficial effects:
[0019] In the relay contact structure and relay suitable for small load conditions described in the utility model, a contact convex portion is provided on the first contact and / or the second contact, that is, the contact convex portion on the first contact and the contact surface of the second contact are contacted and conducted, or the contact convex portion on the second contact and the contact surface of the first contact are contacted and conducted, or the contact convex portion on the first contact and the contact convex portion on the second contact are contacted and conducted with each other, so that when the first contact and the second contact are contacted and conducted, the contact area of the contact part can be effectively reduced. In this way, when used in a low temperature environment, the area of the ice film that needs to be broken for the contact to be conducted is correspondingly reduced, which can improve the probability of the contact failing due to contact failure when used under low temperature and small load conditions, thereby improving its reliability and stability in use. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of the disconnected state of the first contact and the second contact of the first embodiment of the utility model.
[0021] Figure 2 It is a structural schematic diagram from another angle of the disconnected state of the first contact and the second contact of the first embodiment of the utility model.
[0022] Figure 3 It is a structural schematic diagram of the closed state of the first contact and the second contact of the first embodiment of the utility model.
[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the first contact of the first embodiment of the utility model.
[0024] Figure 5 It is a side view of the first contact of the first embodiment of the utility model.
[0025] Figure 6 It is a top perspective view (A=30°) of the first contact and the second contact of the first embodiment of the present invention in the closed state.
[0026] Figure 7 It is a top perspective view (A=90°) of the first contact and the second contact of the first embodiment of the present invention in the closed state.
[0027] Figure 8 It is a schematic diagram of the three-dimensional structure of the first contact of the second embodiment of the utility model.
[0028] Fig. 9 It is a side view of the first contact of the second embodiment of the utility model.
[0029] Fig.10 It is a schematic diagram of the three-dimensional structure of the first contact of the third embodiment of the utility model.
[0030] Fig.11 It is a side view of the first contact of the third embodiment of the present utility model.
[0031] Fig.12 It is a schematic diagram of the three-dimensional structure of the first contact of the fourth embodiment of the utility model.
[0032] Fig.13 It is a side view of the first contact of the fourth embodiment of the utility model.
[0033] Description of labels:
[0034] 1. First contact point, 2. Second contact point, 3. Contact convex part, 4. Step change to large gap. DETAILED DESCRIPTION
[0035] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0036] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying 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, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0037] Embodiment 1
[0038] Please refer to the attached Figure 1One embodiment of the utility model provides a relay contact structure suitable for light load conditions, including a first contact 1 and a second contact 2, and the first contact 1 and / or the second contact 2 are provided with a contact convex portion 3 for reducing the contact area between the first contact 1 and the second contact 2 in a closed state. In the present embodiment, preferably, the first contact 1 and the second contact 2 are both provided with a contact convex portion 3. However, those skilled in the art should understand that in other embodiments, the contact convex portion 3 for contacting and conducting with the contact surface of the second contact 2 may be provided only on the first contact 1, or the contact convex portion 3 for contacting and conducting with the contact surface of the first contact 1 may be provided only on the second contact 2. It can be understood that, in the present embodiment, compared with the existing conventional planar contact or spherical contact structure, by providing a contact protrusion 3 on the first contact 1 and / or the second contact 2, that is, the contact protrusion 3 on the first contact 1 and the contact surface of the second contact 2 are contacted and conducted, or the contact protrusion 3 on the second contact and the contact surface of the first contact 1 are contacted and conducted, or the contact protrusion 3 on the first contact 1 and the contact protrusion 3 on the second contact 2 are contacted and conducted with each other, so that when the first contact 1 and the second contact 2 are contacted and conducted, the contact area of the contact part can be effectively reduced. In this way, when used in a low temperature environment, the area of the ice film that needs to be broken for the contact to be conducted is correspondingly reduced, which can improve the probability of contact failure when the contact is used under low temperature and small load conditions, thereby improving its reliability and stability in use. In addition, on the one hand, due to the presence of the contact protrusion 3, the probability of foreign matter appearing in the contact portion of the contact protrusion 3 is reduced; on the other hand, the presence of the contact protrusion 3 increases the gap between the contact surfaces of the first contact 1 and the second contact 2, and the size tolerance of foreign matter becomes higher. Furthermore, if foreign matter accumulates on the contact surface to form a foreign film or an oxide film is formed on the contact surface, the contact protrusion helps to break the foreign film and the oxide film, thereby improving contact reliability and stability.
[0039] Please refer to the attached Figure 1In one preferred embodiment, preferably, the interfering protrusion 3 is a long strip convex rib structure, and preferably, the protruding vertex of the long strip convex rib structure is in a smooth transition shape. The interfering protrusion 3 arranged on the first contact 1 is located at the center position of the contact surface of the first contact 1 (that is, the central axis of the interfering protrusion 3 coincides with the central axis of the first contact 1), and the interfering protrusion 3 arranged on the second contact 2 is located at the center position of the contact surface of the second contact 2 (that is, the central axis of the interfering protrusion 3 coincides with the central axis of the second contact 2), and when the first contact 1 and the second contact 2 cooperate with each other to form a closed state, the interfering protrusion 3 on the first contact 1 and the interfering protrusion 3 on the second contact 2 are configured to be non-parallel cross-angled interfering cooperation. In this embodiment, the cross-angled interfering angle of the interfering protrusion 3 on the first contact 1 and the interfering protrusion 3 on the second contact 2 when the first contact 1 and the second contact 2 form a closed state is defined as A, then 0°<A<180°. It can be understood that, in the present embodiment, by configuring the two interfering protrusions 3 as a long strip-shaped convex rib structure, even if there is a deviation in the relative installation accuracy between the first contact 1 and the second contact 2, when the first contact 1 and the second contact 2 are close to each other, the two cross-interfering long strip-shaped convex rib structures can also well realize a small-area structure and conduct the first contact 1 and the second contact 2, which is beneficial to reduce the relative installation accuracy requirement between the first contact 1 and the second contact 2.
[0040] Please refer to the attached Figure 1 In one preferred embodiment, A=90° is configured so that when the first contact 1 and the second contact 2 form a closed state, the interfering protrusion 3 on the first contact 1 and the interfering protrusion 3 on the second contact 2 are in cross-interfering cooperation, so as to achieve minimum contact area between the two interfering protrusions 3. However, those skilled in the art should understand that in other embodiments, under the premise of not pursuing minimum contact area, within the range of 0°<A<180°, for example, A=15° or 30° or 45° or 60° or 75° or 105° or 120° or 135° or 150° or 165° or other angle values, through the cross-interfering cooperation of the two long strip convex rib structures, compared with the existing conventional plane-interfering or spherical-interfering contacts, the effect of small-area contact and conduction can be achieved.
[0041] Please refer to the attached Figure 1In one preferred embodiment, a step-change large gap 4 is formed between the first contact 1 and the second contact 2 at the positions around the contacting and matching parts of the contacting convex part 3 on the first contact 1 and the contacting convex part 3 on the second contact 2. In this embodiment, the so-called step-change large gap 4 means that, in an ideal state, the contacting convex part 3 on the first contact 1 and the convex apex of the contacting convex part 3 on the second contact 2 are in point contact matching, and due to the spacing effect of the two contacting convex parts 3 on the contact surfaces of the first contact 1 and the second contact 2, the gap size between the contact surfaces of the first contact 1 and the second contact 2 forms a sudden gap at the positions around the positions where the two contacting convex parts 3 are in point contact matching, compared with the gradual gap of the spherical contact structure where the two spherical surfaces are in contact with each other, and the step change amplitude of the step-change large gap 4 is related to the change of the slope of the two sides of the long strip convex rib structure. The steeper the slope of the two sides of the long strip convex rib structure (equivalent to the thinner and more convex long strip convex rib structure), the greater the step change amplitude of the step-change large gap 4. It can be understood that in the present embodiment, the tiny gap portion between the contact surfaces of the first contact 1 and the second contact 2 is greatly reduced by step-changing the larger gap 4. This can effectively reduce the amount of condensation of water vapor in the tiny gap portion between the contact surfaces of the first contact 1 and the second contact 2, thereby helping to reduce the formation of ice film around the contact portions of the contacts.
[0042] Please refer to the attached Figure 1 In one preferred embodiment, the first contact 1 is one of a static contact structure and a moving contact structure, the second contact 2 is the other of the static contact structure and the moving contact structure, and the first contact 1 is a plane contact structure or a spherical contact structure, and the second contact 2 is a plane contact structure or a spherical contact structure. In this embodiment, preferably, the first contact 1 is a spherical contact structure.
[0043] Please refer to the attached Figure 1 An embodiment of the utility model further provides a relay, comprising the relay contact structure of any of the above embodiments suitable for small load conditions.
[0044] In one of the preferred embodiments, preferably, the relay is a safety relay that uses contacts to switch small load voltage and current in a low temperature environment, or a relay with auxiliary contacts or a signal relay.
[0045] Embodiment 2
[0046] Please refer to the attached Figure 8 , Attachment Fig. 9 The difference between this embodiment and the first embodiment is that the first contact 1 is a planar contact structure.
[0047] Embodiment 3
[0048] Please refer to the attached Fig.10 , Attachment Fig.11 The difference between this embodiment and the first embodiment is that the specific structure of the abutting protrusion 3 is different from the implementation structure of the abutting protrusion 3 in the first embodiment. And the first contact point 1 is a spherical contact point structure.
[0049] Embodiment 4
[0050] Please refer to the attached Fig.12 , Attachment Fig.13 The difference between this embodiment and the third embodiment is that the first contact 1 is a planar contact structure.
[0051] As described above, the embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model. Therefore, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the protection scope of the utility model.
Claims
1. A relay contact structure suitable for light load conditions, characterized in that: The invention comprises a first contact (1) and a second contact (2), wherein the first contact (1) and / or the second contact (2) is provided with an abutting protrusion (3) for reducing the contact area between the first contact (1) and the second contact (2) in a closed state.
2. The relay contact structure suitable for light load conditions according to claim 1, characterized in that: Both the first contact point (1) and the second contact point (2) are provided with abutting protrusions (3).
3. The relay contact structure suitable for light load conditions according to claim 2, characterized in that: The abutting convex part (3) is a long strip convex rib structure; Preferably, the protruding apex of the long strip-shaped convex rib structure is in a smooth transition shape.
4. The relay contact structure suitable for light load conditions according to claim 3, characterized in that: The abutment convex portion (3) arranged on the first contact (1) is located at the center of the contact surface of the first contact (1), and the abutment convex portion (3) arranged on the second contact (2) is located at the center of the contact surface of the second contact (2); and when the first contact (1) and the second contact (2) are matched together to form a closed state, the abutment convex portion (3) on the first contact (1) and the abutment convex portion (3) on the second contact (2) are configured to be non-parallel and cross-angled abutment.
5. The relay contact structure suitable for light load conditions according to claim 4, characterized in that: The intersecting angular interference angle of the interfering protrusion (3) on the first contact (1) and the interfering protrusion (3) on the second contact (2) when the first contact (1) and the second contact (2) form a closed state is defined as A, and 0°<A<180°.
6. The relay contact structure suitable for light load conditions according to claim 5, characterized in that: The configuration A=90° enables that when the first contact (1) and the second contact (2) form a closed state, the abutting protrusion (3) on the first contact (1) and the abutting protrusion (3) on the second contact (2) abut in a cross-shaped manner, so as to achieve minimum contact area between the two abutting protrusions (3).
7. The relay contact structure suitable for light load conditions according to claim 1, characterized in that: A step-change large gap (4) is formed between the first contact (1) and the second contact (2) at positions around the abutment matching portion of the abutment convex portion (3) on the first contact (1) and the abutment convex portion (3) on the second contact (2).
8. The relay contact structure suitable for light load conditions according to any one of claims 1 to 7, characterized in that: The first contact (1) is one of a stationary contact structure and a moving contact structure, the second contact (2) is the other of the stationary contact structure and the moving contact structure, and the first contact (1) is a planar contact structure or a spherical contact structure, while the second contact (2) is a planar contact structure or a spherical contact structure.
9. A relay, characterized in that: The invention comprises a relay contact structure suitable for light load conditions as described in any one of claims 1 to 8.
10. The relay according to claim 9, characterized in that: The relay is a safety relay or a relay with auxiliary contacts or a signal relay that uses contacts to switch small load voltage and current in a low temperature environment.