Relay

Abstract

The utility model discloses a relay. The relay comprises a sealing shell, a contact assembly and filler. The contact assembly comprises a movable contact piece and a static contact piece, the movable contact piece is provided with a movable contact located in the sealing shell, the static contact piece is provided with a static contact located in the sealing shell, and the movable contact is used for being in contact with or separated from the static contact. And the filler is filled in the sealing shell and is used for reducing the risk of adhesion between the movable contact and the static contact.

Description

Technical Field

[0001] The present application relates to the technical field of electric control devices, and in particular to a relay. Background Art

[0002] A relay is an electronic control device with a control circuit (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits. A relay is essentially an "automatic switch" that uses a smaller current to control a larger one. Therefore, it plays a role in automatic regulation, safety protection, and circuit switching.

[0003] As a type of relay, high-voltage DC relays may experience problems with the closing of moving and static contacts during actual use due to failures in other control components when there is no pre-charge circuit or the pre-charge voltage of the pre-charge circuit is insufficient. At this time, the voltage difference between the two ends of the contacts is large, which can easily cause a breakdown arc, leading to melting and adhesion of the moving and static contacts, shortening the service life of the relay. Utility Model Content

[0004] The embodiment of the present application provides a relay to solve the problem of melting and sticking of moving and static contacts existing in the related art.

[0005] The relay of the embodiment of the present application includes:

[0006] Sealed housing;

[0007] a contact assembly comprising a movable contact and a static contact, wherein the movable contact has a movable contact point located within the sealed housing, and the static contact has a static contact point located within the sealed housing, wherein the movable contact point is configured to contact or separate from the static contact point; and

[0008] A filler is filled in the sealed housing to reduce the risk of adhesion between the moving contact and the static contact.

[0009] According to some embodiments of the present application, the filler is in a gaseous state.

[0010] According to some embodiments of the present application, the filler is a mixed gas of hydrogen and nitrogen.

[0011] According to some embodiments of the present application, the volume proportion of the nitrogen in the mixed gas is less than 80%.

[0012] According to some embodiments of the present application, the volume proportion of the nitrogen in the mixed gas is between 30% and 70%.

[0013] According to some embodiments of the present application, the dynamic contact is movably disposed in the sealed housing, and the static contact is mounted on the sealed housing.

[0014] According to some embodiments of the present application, the sealed housing includes an insulating cover, a yoke plate, and a metal cover, the insulating cover is connected to one side surface of the yoke plate in the thickness direction, and the insulating cover and the yoke plate enclose a first chamber, the metal cover is connected to the other side surface of the yoke plate in the thickness direction, and the insulating cover and the yoke plate enclose a second chamber, the yoke plate has a through-hole, the through-hole penetrates the yoke plate along the thickness direction of the yoke plate, and the first chamber is connected to the second chamber through the through-hole;

[0015] Wherein, the contact assembly includes two static contacts, the static contacts are installed in the insulating cover, the dynamic contact is movably arranged in the first chamber, and the two ends of the dynamic contact in the longitudinal direction have the dynamic contacts, which are used to contact or separate with the static contacts of the two static contacts respectively.

[0016] According to some embodiments of the present application, the insulating cover includes a ceramic cover and a frame piece, the opening of the ceramic cover faces the yoke plate, and is connected to the yoke plate through the frame piece;

[0017] Wherein, the static contact piece is mounted on the ceramic cover.

[0018] According to some embodiments of the present application, the sealed housing has an injection hole, and the injection hole passes through the inner wall and the outer wall of the sealed housing;

[0019] The relay further includes a pipe, one end of which is connected to the sealed housing and communicates with the interior of the sealed housing through the injection hole, and the other end of the pipe is a closed end.

[0020] According to some embodiments of the present application, the outer periphery of the pipe has an annular step surface, the pipe is passed through the injection hole, and the annular step surface abuts against the opening edge of the injection hole.

[0021] According to some embodiments of the present application, the relay further includes a welding portion connected to an outer circumferential surface of the pipe and welding the pipe to the sealed housing.

[0022] One embodiment of the above application has at least the following advantages or beneficial effects:

[0023] The sealed housing of the relay in the embodiment of the present application is also filled with a filler, which is configured to reduce the risk of adhesion between the moving contact of the dynamic contact and the static contact of the static contact, thereby avoiding melting and adhesion between the moving and static contacts between the dynamic contact and the static contact, thereby extending the service life of the relay.

[0024] Furthermore, the filler is a mixture of hydrogen and nitrogen. On the one hand, hydrogen has a high thermal conductivity coefficient, which can effectively absorb the heat of the arc generated between the dynamic contact and the static contact and transfer the heat to the surrounding medium, thereby cooling the arc. In addition, the arc voltage drop of the arc in hydrogen is higher, making it easier to extinguish the arc. On the other hand, nitrogen has a high ionization energy and is not easily broken down. Therefore, the arc generated when the dynamic contact and the static contact come into contact is smaller, reducing the degree of melting of the dynamic and static contacts, thereby reducing the risk of contact adhesion. On the other hand, hydrogen and nitrogen form a mixed gas, and the arc burning stability of the mixed gas is higher than that of hydrogen, and the arc burning time is shorter. Therefore, when the dynamic contact and the static contact are connected multiple times, the problem of local excessive energy will not occur, further reducing the risk of contact adhesion.

[0025] Furthermore, if the volume proportion of nitrogen in the mixed gas is between 30% and 70%, both connection and disconnection can be taken into account, and while minimizing the risk of contact adhesion, it also has a good arc extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Shown is a three-dimensional schematic diagram of a relay according to an embodiment of the present application.

[0027] Figure 2 Shown is the Figure 1 A cross-sectional view taken along line AA, omitting the coil assembly and U-shaped yoke.

[0028] Figure 3 The graph shows the number of relay connections and the maximum breaking current.

[0029] Figure 4 It is shown that Figure 1 Inverted schematic diagram, omitting the coil assembly and U-yoke.

[0030] Figure 5 Shown is a schematic diagram of the storage tank filling the relay.

[0031] The description of the accompanying drawings is as follows:

[0032] 10. Relay; 20. Storage tank;

[0033] 100, sealed housing; 101, first chamber; 102, second chamber; 110, insulating cover; 111, ceramic cover; 112, frame; 120, yoke plate; 121, perforation; 122, injection hole; 130, metal cover;

[0034] 200, contact assembly; 210, dynamic contact piece; 220, static contact piece;

[0035] 300, pipe fitting; 310, annular step surface;

[0036] 510 , coil assembly; 520 , U-shaped yoke; 530 , push rod member; 540 , welding portion. DETAILED DESCRIPTION

[0037] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0038] It is understood that the terms "including" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to the process, method, product, or apparatus.

[0039] like Figure 1 and Figure 2 As shown, the relay 10 of the present embodiment includes a sealed housing 100, a contact assembly 200, a push rod member 530, and a coil assembly 510. The contact assembly 200 includes a movable contact 210 and two static contacts 220. The static contact 220 has a static contact located within the sealed housing 100, and the movable contact 210 has a movable contact located within the sealed housing 100. The movable contact is used to make or break contact with the static contacts. The static contact 220 is mounted in the sealed housing 100, and the movable contact 210 is movably disposed within the sealed housing 100. The movable contact 210 has movable contacts at both ends of its longitudinal direction, which are used to make or break contact with the static contacts of the two static contacts 220, respectively. The push rod member 530 is movably disposed in the sealed housing 100. The movable contact 210 is mounted on the push rod member 530, and the push rod member 530 is used to drive the movable contact 210 to move. The coil assembly 510 is configured to drive the push rod member 530 to move in response to an input signal.

[0040] The moving contact can be integrally formed with the moving contact 210 , and the static contact can be integrally formed with the static contact 220 . Of course, in other embodiments, the moving contact and the static contact can also be separate parts connected to the moving contact 210 and the static contact 220 .

[0041] In one embodiment, the sealed housing 100 includes an insulating cover 110, a yoke plate 120, and a metal cover 130. The insulating cover 110 is connected to one side surface of the yoke plate 120 in the thickness direction, and the insulating cover 110 and the yoke plate 120 enclose a first chamber 101. The metal cover 130 is connected to the other side surface of the yoke plate 120 in the thickness direction, and the insulating cover 110 and the yoke plate 120 enclose a second chamber 102. The yoke plate 120 has a through-hole 121, which passes through the yoke plate 120 in the thickness direction of the yoke plate 120, and the first chamber 101 is connected to the second chamber 102 through the through-hole 121. The static contact 220 is mounted on the insulating cover 110, and the dynamic contact 210 is movably disposed in the first chamber 101. The push rod member 530 is movably disposed in the through-hole 121. The coil assembly 510 is located on a side of the yoke plate 120 facing away from the insulating cover 110 and is sleeved on the outer periphery of the metal cover 130 .

[0042] In one embodiment, the insulating cover 110 includes a ceramic cover 111 and a frame piece 112 . The opening of the ceramic cover 111 faces the yoke plate 120 and is connected to the yoke plate 120 via the frame piece 112 . The static contact 220 is mounted on the ceramic cover 111 .

[0043] As an example, the ceramic cover 111 is made of a ceramic material. The frame piece 112 can be a metal piece with a ring structure, for example, made of an iron-nickel alloy. One end of the frame piece 112 is connected to the opening edge of the ceramic cover 111, and the other end of the frame piece 112 is connected to the yoke plate 120. The frame piece 112 is arranged between the ceramic cover 111 and the yoke plate 120 to facilitate the connection between the ceramic cover 111 and the yoke plate 120.

[0044] In one embodiment, the ceramic cover 111 and the frame piece 112 , the frame piece 112 and the yoke plate 120 , and the metal cover 130 and the yoke plate 120 are all connected by welding, but the present invention is not limited thereto.

[0045] The relay 10 further includes a U-shaped yoke 520 , both sides of which are connected to the yoke plate 120 such that the U-shaped yoke 520 surrounds the coil assembly 510 .

[0046] The relay 10 further includes a filler, which is filled in the sealed housing 100 to reduce the risk of adhesion between the moving contact of the moving contact 210 and the static contact of the static contact 220 .

[0047] In an embodiment of the present application, the sealed housing 100 of the relay 10 is also filled with a filler, which is configured to reduce the risk of adhesion between the moving contact of the moving contact 210 and the static contact of the static contact 220, thereby avoiding melting and adhesion between the moving and static contacts between the moving contact 210 and the static contact 220, thereby extending the service life of the relay 10.

[0048] In one embodiment, the filler is in a gaseous state. Of course, in other embodiments, the filler can also be in a liquid state. In particular, when the filler is in a gaseous or liquid state, it should be insulating.

[0049] In one embodiment, the filler is a mixed gas of hydrogen and nitrogen.

[0050] In the embodiment of the present application, on the one hand, hydrogen has a higher thermal conductivity, which can effectively absorb the heat of the arc generated between the dynamic contact 210 and the static contact 220 and transfer the heat to the surrounding medium, thereby cooling the arc; and, the arc voltage drop of the arc in hydrogen is higher, making it easier to extinguish the arc; on the other hand, nitrogen has a higher ionization energy and is not easily broken down, so the arc generated when the dynamic contact 210 contacts the static contact 220 is smaller, reducing the degree of melting of the dynamic and static contacts, thereby reducing the risk of contact adhesion; on the other hand, hydrogen and nitrogen form a mixed gas, and the arc burning stability of the mixed gas is higher than that of hydrogen, and the arc burning time is shorter, so when the dynamic contact 210 and the static contact 220 are connected multiple times, there will be no problem of excessive local energy, further reducing the risk of contact adhesion.

[0051] In one embodiment, the volume percentage of nitrogen in the mixed gas is less than 80%. Furthermore, the volume percentage of nitrogen in the mixed gas is between 30% and 70%, for example, the volume percentage of nitrogen in the mixed gas is 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, or 70%.

[0052] like Figure 3 The figure shows a graph of the number of connections versus the maximum breaking current at different nitrogen volume ratios, with the blue curve representing the number of connections and the orange curve representing the maximum breaking current. It should be noted that the above graphs were obtained based on tests of the same relay, and the horizontal axis in the figure represents the volume ratio of nitrogen, while the volume ratio of hydrogen represents the remaining volume ratio. For example, a horizontal axis of 0.3 indicates that the volume ratio of nitrogen is 30% and the volume ratio of hydrogen is 70%.

[0053] Depend on Figure 3 It can be seen that as the volume proportion of nitrogen gradually increases, the number of contacts gradually increases, while the limit breaking current gradually decreases. That is, when the volume proportion of nitrogen is relatively small, the relay 10 has a larger limit breaking current, which is conducive to breaking; when the volume proportion of nitrogen is relatively large, the relay 10 has more connection times, which is conducive to connection.

[0054] Therefore, in the embodiment of the present application, the volume proportion of nitrogen in the mixed gas is between 30% and 70%, which can take into account both connection and disconnection, and has a good arc extinguishing effect while minimizing the risk of contact adhesion.

[0055] like Figure 2 and Figure 3 As shown, the sealed housing 100 has an injection hole 122 that passes through the inner and outer walls of the sealed housing 100. The relay 10 also includes a pipe 300. One end of the pipe 300 is connected to the sealed housing 100 and communicates with the interior of the sealed housing 100 through the injection hole 122. The other end of the pipe 300 is closed. Filler can be injected into the sealed housing 100 through the pipe 300.

[0056] In the embodiment of the present application, the injection hole 122 is opened on the yoke plate 120. Of course, in other embodiments, the injection hole 122 can also be opened on any one of the metal cover 130, the frame piece 112, and the ceramic cover 111.

[0057] In one embodiment, the outer circumference of the tube 300 has an annular stepped surface 310. The tube 300 is inserted into the injection hole 122, and the annular stepped surface 310 abuts against the opening edge of the injection hole 122. The relay 10 also includes a welding portion 540 connected to the outer circumference of the tube 300 and welding the tube 300 to the sealed housing 100.

[0058] In the embodiment of the present application, the pipe fitting 300 is inserted into the injection hole 122, the annular step surface 310 abuts against the opening edge of the injection hole 122, and the pipe fitting 300 is welded to the sealed shell 100 through the welding portion 540, so that the connection between the pipe fitting 300 and the sealed shell 100 is more firmly established, thereby preventing the pipe fitting 300 from accidentally falling off from the sealed shell 100 during the process of injecting the filler into the sealed shell 100 through the pipe fitting 300, causing the filler to leak out.

[0059] Another aspect of the present invention provides a method for injecting filler, which is applied to a relay 10. The relay 10 includes a sealed housing 100 and a contact assembly 200. The contact assembly 200 includes a dynamic contact 210 movably disposed within the sealed housing 100 and two static contacts 220 mounted within the sealed housing 100. The dynamic contact 210 is configured to contact or separate from the two static contacts 220. The sealed housing 100 has an injection hole 122 extending through the inner and outer walls of the sealed housing 100. The method for injecting filler includes providing a storage tank 20 containing filler; and injecting the filler into the sealed housing 100 through the injection hole 122. The filler is used to reduce the risk of adhesion between the dynamic contact 210 and the static contact 220.

[0060] In one embodiment, the filler is a mixed gas of hydrogen and nitrogen.

[0061] In the embodiment of the present application, hydrogen and nitrogen are pre-mixed in a predetermined volume ratio within storage tank 20 to form a mixed gas, which is then injected into sealed housing 100. This pre-mixing and subsequent injection method makes the injection process more convenient for personnel. Furthermore, pre-mixing hydrogen and nitrogen within storage tank 20 to form a mixed gas facilitates standardized operations, and the volume ratio of the mixed gas is more accurate and consistent.

[0062] In one embodiment, the volume percentage of nitrogen in the mixed gas is less than 80%. Furthermore, the volume percentage of nitrogen in the mixed gas is between 30% and 70%, for example, the volume percentage of nitrogen in the mixed gas is 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, or 70%.

[0063] In one embodiment, the method further includes providing a pipe 300 , wherein one end of the pipe 300 is connected to the sealed housing 100 and communicates with the injection hole 122 , and the other end of the pipe 300 is connected to the storage tank 20 .

[0064] In an embodiment of the present application, the storage tank 20 and the other end of the pipe fitting 300 can be connected by means of a clamp, a flange, etc., without directly connecting the storage tank 20 to the sealed housing 100 of the relay 10. On the one hand, damage to the sealed housing 100 is avoided; on the other hand, the length of the pipe fitting 300 can be designed to be longer, which is more convenient for the staff to perform the connection work.

[0065] In one embodiment, the method further includes: when the filler injected into the sealed shell 100 reaches a predetermined amount, removing the tail section of the tube 300 and closing the opening at the end of the remaining tube 300; wherein the length of the remaining tube 300 is less than the length of the removed tube 300.

[0066] In the embodiment of the present application, after the filler is injected, part of the tube 300 is removed, and the length of the remaining tube 300 is smaller than the length of the removed tube 300. This can reduce the volume occupied by the remaining tube 300, which is conducive to miniaturization of the relay 10.

[0067] The opening at the end of the remaining pipe 300 may be sealed by welding, for example, but not limited thereto.

[0068] In summary, the relay 10 and the method for injecting filler according to the embodiment of the present application have at least the following advantages and beneficial effects:

[0069] The sealed housing 100 of the relay 10 in the embodiment of the present application is also filled with a filler, which is configured to reduce the risk of adhesion between the moving contact 210 and the static contact 220, thereby avoiding melting and adhesion between the moving and static contacts between the moving contact 210 and the static contact 220, thereby extending the service life of the relay 10.

[0070] Furthermore, the filler is a mixture of hydrogen and nitrogen. On the one hand, hydrogen has a high thermal conductivity, which can effectively absorb the heat of the arc generated between the dynamic contact 210 and the static contact 220 and transfer the heat to the surrounding medium, thereby cooling the arc. In addition, the arc voltage drop of the arc in hydrogen is higher, making it easier to extinguish the arc. On the other hand, nitrogen has a high ionization energy and is not easily broken down. Therefore, the arc generated when the dynamic contact 210 and the static contact 220 contact is smaller, reducing the degree of melting of the dynamic and static contacts, thereby reducing the risk of contact adhesion. On the other hand, hydrogen and nitrogen form a mixed gas, and the arc burning stability of the mixed gas is higher than that of hydrogen, and the arc burning time is shorter. Therefore, when the dynamic contact 210 and the static contact 220 are connected multiple times, there will be no problem of local excessive energy, further reducing the risk of contact adhesion.

[0071] Furthermore, if the volume proportion of nitrogen in the mixed gas is between 30% and 70%, both connection and disconnection can be taken into account, and while minimizing the risk of contact adhesion, it also has a good arc extinguishing effect.

[0072] It is understandable that the various embodiments / implementations provided in this application can be combined with each other without causing any contradiction, and they will not be illustrated one by one here.

[0073] In the application examples, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the application examples can be understood according to the specific circumstances.

[0074] In the description of the application embodiments, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the application embodiments and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the application embodiments.

[0075] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the claimed invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0076] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A relay, characterized in that: include: Sealed housing; A contact assembly, comprising a moving contact and a static contact, wherein the moving contact has a moving contact point located in the sealed housing, and the static contact has a static contact point located in the sealed housing, wherein the moving contact point is used to contact or separate from the static contact point; as well as A filler is filled in the sealed housing to reduce the risk of adhesion between the moving contact and the static contact.

2. The relay according to claim 1, wherein: The filler is in gaseous state.

3. The relay according to claim 2, characterized in that The filler is a mixed gas of hydrogen and nitrogen.

4. The relay according to claim 3, characterized in that The volume proportion of the nitrogen in the mixed gas is less than 80%.

5. The relay according to claim 4, characterized in that The volume proportion of the nitrogen in the mixed gas is between 30% and 70%.

6. The relay according to any one of claims 1 to 5, characterized in that: The dynamic contact piece is movably arranged in the sealing housing, and the static contact piece is installed on the sealing housing.

7. The relay according to claim 6, characterized in that The sealed housing includes an insulating cover, a yoke plate, and a metal cover, wherein the insulating cover is connected to one side surface of the yoke plate in the thickness direction, and the insulating cover and the yoke plate enclose a first chamber, and the metal cover is connected to the other side surface of the yoke plate in the thickness direction, and the insulating cover and the yoke plate enclose a second chamber, the yoke plate has a through-hole, and the through-hole penetrates the yoke plate along the thickness direction of the yoke plate, and the first chamber is connected to the second chamber through the through-hole; Wherein, the contact assembly includes two static contacts, the static contacts are installed in the insulating cover, the dynamic contact is movably arranged in the first chamber, and the two ends of the dynamic contact in the longitudinal direction have the dynamic contacts, which are used to contact or separate with the static contacts of the two static contacts respectively.

8. The relay according to claim 7, characterized in that The insulating cover includes a ceramic cover and a frame piece, wherein the opening of the ceramic cover faces the yoke plate and is connected to the yoke plate through the frame piece; Wherein, the static contact piece is mounted on the ceramic cover.

9. The relay according to any one of claims 1 to 5, characterized in that: The sealed housing has an injection hole, and the injection hole passes through the inner wall and the outer wall of the sealed housing; The relay further includes a pipe, one end of which is connected to the sealed housing and communicates with the interior of the sealed housing through the injection hole, and the other end of the pipe is a closed end.

10. The relay according to claim 9, characterized in that The outer periphery of the pipe is provided with an annular step surface, the pipe is passed through the injection hole, and the annular step surface abuts against the opening edge of the injection hole.

11. The relay according to claim 10, characterized in that The relay further includes a welding portion connected to the outer peripheral surface of the pipe and welding the pipe to the sealed housing.

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