Balanced force sealed relay and method of assembling same

Abstract

The present application relates to a balanced force type sealed relay and an assembling method thereof, the assembling method is that the first contact part of the U-shaped spring leaf is directly fixed and assembled in a non-detachable connection mode between the U-shaped spring fixed sheet on the lower contact system, then the whole is assembled with the upper magnetic circuit system, and the second contact part of the U-shaped spring leaf is in sliding contact with the moving spring sheet of the upper magnetic circuit system, the assembling mode is not limited to the installation space, especially for the balanced force type sealed relay with multiple groups of conversion contacts, the assembling efficiency is greatly improved, the automatic equipment can be used for assembling the U-shaped spring leaf, the consistency of the assembling is ensured, and the contact reliability of the loop is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic relay manufacturing, in particular to a balanced force type sealed relay and an assembling method thereof. BACKGROUND

[0002] The balanced force type sealed relay has excellent environmental mechanical properties due to the same armature holding force and contact pressure in the energizing and de-energizing states, and is widely used in the field of aerospace.

[0003] The structure of the existing balanced force type sealed relay is shown in the drawings of the patent with the publication number CN209045449U Figure 2 As the armature structure on the magnetic circuit system is a seesaw type structure rotating around the shaft, the connection between the conversion foot on the contact system and the moving spring piece on the armature structure is generally realized by a U-shaped spring piece for soft connection, which does not obviously hinder the rotation process of the armature assembly while ensuring good contact conditions.

[0004] The structure of the U-shaped spring piece is shown in the drawings of the patent with the publication number CN209045449U Figure 3 As the U-shaped spring piece is fixed by clamping the two clamping portions on the lower part thereof with the U-shaped spring fixing piece on the conversion foot and by inserting the upper part of the U-shaped spring piece into the clamping groove of the supporting piece on the lower part of the moving spring piece, there are two contact points between the U-shaped spring piece and the U-shaped spring fixing piece and the supporting piece. In order to ensure the stability of the loop contact circuit, both contact points must be reliably contacted and have relatively low and stable contact resistance, so that high requirements are placed on the U-shaped spring fixing piece, the supporting piece and the U-shaped spring piece, i.e. the contact position must be free of burrs and have high surface finish, which increases the cost of part manufacturing.

[0005] Meanwhile, the assembling process of the existing balanced force type sealed relay is to first assemble the upper magnetic circuit system and the lower contact system, and then clamp one end of the U-shaped spring piece with the clamping groove of the supporting piece on the upper part and clamp the other end of the U-shaped spring piece with the U-shaped spring fixing piece by the two clamping portions provided thereon. Therefore, the U-shaped spring piece is assembled in the space between the magnetic circuit system and the contact system. Due to the limitation of the installation space, the installation of the U-shaped spring piece is not conducive. Especially in the application occasion of multiple sets of conversion contacts, workers can only assemble the U-shaped spring piece by using tweezers, which leads to low assembly efficiency and poor consistency of manual assembly, which increases the risk of unreliable contact and large contact resistance. The product under the rated load condition has a high risk of burning due to high temperature rise caused by large contact resistance. SUMMARY

[0006] The present application also provides a balanced force type sealed relay to solve the problems of low assembly efficiency, non-automatic assembly and large contact resistance of the existing balanced force type sealed relay.

[0007] Specifically as follows:

[0008] The balanced force type sealed relay comprises a magnetic circuit system, a contact system, and a U-shaped spring sheet connecting the magnetic circuit system and the contact system, wherein the U-shaped spring sheet has a first contact part and a second contact part arranged in a U shape, the first contact part of the U-shaped spring sheet is directly fixed on a U-shaped spring fixing sheet of the contact system in a non-detachable manner, the free end of the second contact part has a contact surface, and the contact surface is in sliding contact with the bottom surface of the lower supporting sheet of the moving spring sheet to realize the conduction of the circuit.

[0009] In some embodiments, the contact surface of the U-shaped spring sheet is a spherical surface on the second contact part.

[0010] In some embodiments, the free end of the second contact part is bent towards the first contact part, and the highest point of the contact surface is the maximum vertical distance between the second contact part and the first contact part.

[0011] In some embodiments, the first contact part and the U-shaped spring fixing sheet are fixed by welding.

[0012] In some embodiments, the top of the U-shaped spring fixing sheet is a first plane, and the bottom surface of the first contact part is a second plane matched with the top plane of the U-shaped spring fixing sheet, and the first plane and the second plane are in plane contact and fixed by welding.

[0013] In some embodiments, it has not less than three groups of conversion contacts.

[0014] The present application aims to provide an assembly method of a balanced force type sealed relay to solve the problems of low assembly efficiency and inability to automate assembly of the existing balanced force type sealed relay.

[0015] An assembly method of a balanced force type sealed relay, which provides a U-shaped spring sheet having a first contact part and a second contact part arranged in a U shape, and the free end of the second contact part has a contact surface, wherein during assembly, the first contact part of the U-shaped spring sheet is directly fixed on a U-shaped spring fixing sheet of the contact system in a non-detachable manner, then the contact system is assembled with the magnetic circuit system, and the contact surface on the second contact part of the U-shaped spring sheet is in sliding contact with the bottom surface of the lower supporting sheet of the moving spring sheet of the magnetic circuit system to realize the conduction of the circuit.

[0016] In some embodiments, the first contact part of the U-shaped spring sheet and the U-shaped spring fixing sheet are directly fixed by welding.

[0017] In some embodiments, the top of the U-shaped spring fixed piece is a first plane, the bottom surface of the first contact part is a second plane which is arranged to match the plane of the top of the U-shaped spring fixed piece, the first plane and the second plane are in plane contact and are fixed by welding. In some embodiments, the contact surface of the U-shaped spring piece is a spherical surface on the second contact part.

[0018] The balanced force type sealed relay and the assembling method thereof provided by the present application have the following advantages compared with the prior art: the assembling method provided by the present application is to directly and fixedly assemble the first contact part of the U-shaped spring piece and the U-shaped spring fixed piece on the lower contact system in a non-detachable manner, then to assemble the whole with the upper magnetic circuit system, and to make the other end of the U-shaped spring piece in sliding contact with the bottom surface of the supporting piece of the lower part of the moving spring piece of the upper magnetic circuit system. This assembling method is not limited by the installation space, especially for the balanced force type sealed relay with multiple groups of conversion contacts, greatly improves the assembling efficiency, and can use automatic equipment to assemble the U-shaped spring piece, and can ensure the consistency of the assembly and improve the contact reliability of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A schematic diagram of the balanced force type sealed relay of the present application is shown.

[0020] Figure 2 An exploded view of the balanced force type sealed relay of the present application is shown.

[0021] Figure 3 A schematic diagram of the U-shaped spring piece of the balanced force type sealed relay of the present application is shown.

[0022] Figure 4 A schematic diagram of the assembly of the U-shaped spring piece, the U-shaped spring fixed piece and the supporting piece of the present application is shown. DETAILED DESCRIPTION

[0023] To further illustrate the embodiments, the present application provides accompanying drawings. These drawings are a component of the disclosure of the present application, which mainly serve to illustrate the embodiments, and can be used to explain the operating principle of the embodiments in conjunction with the related description of the specification. Those of ordinary skill in the art should be able to understand other possible implementations and advantages of the present application in conjunction with these contents. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0024] The present application will be further described in conjunction with the accompanying drawings and specific embodiments.

[0025] The application provides an assembling method of a balanced force sealed relay, and provides a U-shaped spring sheet with a first contact part and a second contact part arranged in a U shape, and the free end of the second contact part is provided with a contact surface, the assembling method is that the first contact part of the U-shaped spring sheet is directly fixed and assembled on the U-shaped spring fixing sheet of the contact system in a non-detachable connection mode, then the whole is assembled with the upper magnetic circuit system, and the contact surface on the second contact part of the U-shaped spring sheet is in sliding contact with the bottom surface of the lower supporting sheet of the moving spring sheet of the magnetic circuit system to realize the conduction of the circuit, the assembling mode is not limited to the installation space, especially for the balanced force sealed relay with multiple groups of conversion contacts, the assembling efficiency is greatly improved, the U-shaped spring sheet can be assembled by using automatic equipment, the consistency of the assembling is ensured, and the contact reliability of the circuit is improved.

[0026] The assembling method is described through a specific embodiment, as shown in the figure, the specific embodiment provides a balanced force sealed relay, which comprises a magnetic circuit system 1, a contact system 2 and a U-shaped spring sheet 30 connecting the magnetic circuit system 1 and the contact system 2. Figures 1-4

[0027] The armature on the magnetic circuit system 1 is a seesaw type structure rotating around the shaft, the bottom of the moving spring sheet 10 on the armature is provided with a supporting sheet 11 in contact with the U-shaped spring sheet 30. The top of the conversion foot 20 on the contact system 2 is provided with a U-shaped spring fixing sheet 21 for fixing the U-shaped spring sheet 30. The two sides of the conversion contact of the moving spring sheet 10 are respectively provided with an arc separation cover 4.

[0028] It should be noted that the magnetic circuit system 1 and the contact system 2 shown in the specific embodiment are only examples, and are not limited thereto, and other magnetic circuit systems 1 and contact systems 2 in the prior art can be used to replace them. The balanced force sealed relay shown in the specific embodiment has four groups of conversion contacts, and is not limited thereto, and the number of groups of conversion contacts can be increased or decreased according to actual needs, but the assembling method is applied to the balanced force sealed relay with not less than three groups of conversion contacts, and has more obvious advantages.

[0029] ​The difference between the balanced force type sealed relay provided by the embodiment and the balanced force type sealed relay in the prior art is the assembly method and structure of the U-shaped spring sheet 30. Specifically, the U-shaped spring sheet 30 in the embodiment has oppositely arranged first and second contact portions 300 and 301, and the first and second contact portions 300 and 301 are connected in an arc shape to form a U-shaped structure with a certain elasticity. The first contact portion 300 of the U-shaped spring sheet 30 is directly fixed on the U-shaped spring fixing sheet 21 in a non-detachable connection manner, so that the stability between the U-shaped spring sheet 30 and the U-shaped spring fixing sheet 21 is ensured after the U-shaped spring sheet 30 is fixed on the U-shaped spring fixing sheet 21, and the U-shaped spring sheet 30 will not be loosened or fallen off due to external touch, vibration and other factors, facilitating subsequent assembly. The fixed assembly between the first contact portion 300 and the U-shaped spring fixing sheet 21 can be realized by a non-detachable connection method such as spot welding, riveting and the like.

[0030] The second contact portion 301 has a contact surface 3010, which is in sliding contact with the supporting sheet 11, so as to realize the conduction of the contact circuit.

[0031] The balanced force type sealed relay provided by the embodiment reduces the contact points (the contact points between the U-shaped spring sheet 30 and the U-shaped spring fixing sheet 21 and the supporting sheet 11) in the contact circuit from two in the prior art to only one, greatly improving the reliability of the contact circuit. At the same time, since one end of the U-shaped spring sheet 30 is fixedly assembled with the U-shaped spring fixing sheet in a non-detachable connection manner, the U-shaped spring sheet 30 is directly fixed on the U-shaped spring fixing sheet 21 of the lower contact system 2 during assembly of the balanced force type sealed relay, and then the whole is assembled with the upper magnetic circuit system 1, so that the assembly process is not limited by the installation space, facilitating installation, especially in the application occasions of multiple groups of switching contacts, the installation space is not limited, the assembly efficiency is greatly improved, and automatic equipment can be used for assembly of the U-shaped spring sheet, the consistency of assembly is ensured, and the contact reliability of the circuit is improved.

[0032] In addition, the plug-in assembly between the existing technology and the support sheet 11 is changed into a sliding contact assembly, and the contact surface 3010 and the support sheet 11 are always kept in a contact state by the elastic force of the U-shaped spring 30. In the plug-in assembly of the existing technology, in order to ensure the smoothness of the plug-in, the plug-in head of the U-shaped spring is smaller than the clamping groove on the support sheet, so that when the armature structure rotates around the shaft, the clamping groove in the plug-in head will be suspended, which reduces the contact surface and causes the contact resistance between the two to fluctuate. In the embodiment, the U-shaped spring 30 and the support sheet are in sliding contact, and the contact point position between the head of the U-shaped spring and the support sheet moves forward and backward during the rotation process, forming sliding friction, which helps to reduce the film resistance of the contact point position between the U-shaped spring and the support sheet, and further keeps the contact resistance of the contact point position stable. In the existing technology, only slight rolling friction exists between the U-shaped spring and the support sheet, which is not conducive to the elimination of the film resistance of the contact part.

[0033] In a preferred mode of the embodiment, the first contact part 300 and the U-shaped spring fixing sheet 21 are fixedly assembled by welding (for example, brazing). By using welding, the first contact part 300 and the U-shaped spring fixing sheet 21 are only slightly in contact to realize welding fixation, which will not affect other parts on the contact system 2, and the welding can be in the form of spot welding, which is suitable for automatic assembly of the U-shaped spring 30 of the small-size balanced force type sealed relay.

[0034] In addition, more preferably, the top of the U-shaped spring fixing sheet 21 is a flat surface, and the bottom surface of the first contact part 300 is a flat surface matched with the top flat surface of the U-shaped spring fixing sheet 21, and the U-shaped spring fixing sheet 21 and the first contact part 300 are fixed by plane contact and welding, which greatly improves the reliability of the contact between the two, reduces the contact resistance, and the requirements for the surface finish, burr, etc. of the contact position of the U-shaped spring fixing sheet 21 and the first contact part 300 are not as high as in the existing technology, which can reduce the manufacturing cost of the parts.

[0035] In a preferred mode of the embodiment, the contact surface 3010 of the U-shaped spring 30 is a spherical surface located on the free end of the second contact part 301, so that the contact surface 3010 and the support sheet form a spherical sliding contact, which greatly improves the reliability of the contact between the two, and changes the plug-in assembly in the existing technology into a spherical contact assembly, which does not interfere with the rotation of the armature structure, and the spherical design of the contact surface greatly reduces the control requirements for the parts, thereby reducing the manufacturing cost of the parts.

[0036] In addition, the sliding contact of the spherical surface reduces the friction between the holder and the U-shaped spring, and reduces the resistance generated by the contact position of the U-shaped spring and the holder during the rotation of the armature, thereby ensuring reliable attraction and release of the armature. Since the armature drives the holder to rotate around the shaft, the position of the contact point between the spherical surface of the head of the U-shaped spring and the holder is displaced before and after the rotation, forming sliding friction, which helps to reduce the film resistance of the contact point between the U-shaped spring and the holder, thereby maintaining the stability of the contact resistance of the contact point. In the prior art, the U-shaped spring and the holder only have slight rolling friction, which is not conducive to the elimination of the film resistance of the contact part.

[0037] At the same time, since the holder is generally made of pure silver or other materials with good conductivity and low hardness, under the selection of appropriate compression force, the spherical contact surface of the U-shaped spring is easy to change from point contact to surface contact under the action of pressure, further reducing the contact resistance and improving the contact reliability.

[0038] More preferably, the free end of the second contact part 301 is bent towards the first contact part 300, and the highest point of the contact surface 3010 is the maximum vertical distance between the second contact part 301 and the first contact part 300, so that during assembly, the assembly between the magnetic circuit system 1 and the contact system 2 will not be interfered by the U-shaped spring 30, and the assembly efficiency can be further improved.

[0039] Although the present application is specifically shown and described in connection with preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the spirit and scope of the present application as defined in the appended claims, and all such changes are intended to be within the scope of the present application.

Claims

1. A force balance sealed relay comprising a magnetic circuit system, a contact system and a U-shaped spring connecting the magnetic circuit system and the contact system, characterized in that: The U-shaped spring piece has a first contact part and a second contact part arranged in a U shape, the first contact part of the U-shaped spring piece is directly fixed and assembled on the U-shaped spring fixing piece of the contact system in a non-detachable connection, the free end of the second contact part has a contact surface, the contact surface is in sliding contact with the bottom surface of the lower supporting piece of the moving spring piece to realize the conduction of the circuit; the contact surface of the U-shaped spring piece is a spherical surface on the second contact part, the highest point of the spherical surface is the contact point; the free end of the second contact part is bent towards the first contact part, and the highest point of the contact surface is the maximum vertical distance of the second contact part from the first contact part, and the vertical projection of the contact point is located on the first contact part; the first contact part and the U-shaped spring fixing piece are fixed and assembled by welding; the top of the U-shaped spring fixing piece is a first plane, the bottom surface of the first contact part is a second plane matched with the top plane of the U-shaped spring fixing piece, the first plane and the second plane are in plane contact and are fixed by welding.

2. The force balance sealed relay of claim 1, wherein: It has not less than three groups of conversion contacts.

3. A method of assembling a force balanced sealed relay as claimed in claim 1, characterized in that: The U-shaped spring piece has a first contact part and a second contact part arranged in a U shape, the first contact part of the U-shaped spring piece is directly fixed and assembled on the U-shaped spring fixing piece of the contact system in a non-detachable connection, the free end of the second contact part has a contact surface, the contact surface is in sliding contact with the bottom surface of the lower supporting piece of the moving spring piece to realize the conduction of the circuit; the contact surface of the U-shaped spring piece is a spherical surface on the second contact part, the highest point of the spherical surface is the contact point; the free end of the second contact part is bent towards the first contact part, and the highest point of the contact surface is the maximum vertical distance of the second contact part from the first contact part, and the vertical projection of the contact point is located on the first contact part; the first contact part and the U-shaped spring fixing piece are fixed and assembled by welding; the top of the U-shaped spring fixing piece is a first plane, the bottom surface of the first contact part is a second plane matched with the top plane of the U-shaped spring fixing piece, the first plane and the second plane are in plane contact and are fixed by welding.

4. The method of assembly of claim 3, wherein: The first contact part of the U-shaped spring piece and the U-shaped spring fixing piece are directly fixed by welding.

5. The method of assembly of claim 4, wherein: The top of the U-shaped spring fixing piece is a first plane, the bottom surface of the first contact part is a second plane matched with the top plane of the U-shaped spring fixing piece, the first plane and the second plane are in plane contact and are fixed by welding.

6. The method of assembly of claim 3, wherein: The contact surface of the U-shaped spring piece is a spherical surface on the second contact part.

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