Flexible transmission structure of programmable step attenuator based on sealing ring

Abstract

The present invention discloses a flexible transmission structure of a programmable step attenuator based on a sealing ring, comprising a lower armature fixed to the bottom end of an iron core and two push rods connected to the lower armature, two U-shaped grooves are provided on the lower armature, each push rod comprises a rod body and a head connected to the top end of the rod body, the diameter of the head is larger than the diameter of the rod body, an annular groove is provided on the head, the part of the head located in the annular groove is a plug rod part, an upper sealing ring and a lower sealing ring are sleeved and connected to the plug rod part, the plug rod part of each push rod is inserted into the corresponding U-shaped groove, and the upper sealing ring and the lower sealing ring are in close contact with the upper end face and the lower end face of the lower armature respectively. The present invention installs upper and lower sealing rings on the head of the push rod, and the iron core and the push rod of the electromagnetic drive unit are fixed together by the elasticity of the upper and lower sealing rings. During the switching action of the programmable step attenuator, the upper and lower sealing rings reduce the force impact during the switching process, thereby increasing the service life of the programmable step attenuator.

Description

Technical Field

[0001] The invention relates to the technical field of programmable step attenuators, in particular to a sealing ring-based flexible transmission structure of a programmable step attenuator. Background Art

[0002] The programmable step attenuator usually consists of two major components: an electromagnetic drive unit and a microwave attenuation unit. As the source of driving force, the electromagnetic drive unit is the key component for the programmable step attenuator to realize the programmable and stepping functions; the microwave attenuation unit is the direct execution component for realizing the attenuation function. The electromagnetic drive unit drives the edge line of the microwave attenuation unit to move back and forth, so that the microwave signal switches back and forth between the straight-through and attenuation states. Therefore, a transmission mechanism is used between the electromagnetic drive unit and the microwave attenuation unit to realize the connection and transmission between the two. The existing transmission mechanisms can be roughly divided into two categories. One is rigid contact, that is, a metal push rod is used to directly drive the push rod to move, thereby realizing the transmission of force and displacement. Rigid contact has high requirements on the processing and assembly accuracy of parts, and has high friction and low vibration resistance. It is currently used less and less. The other method uses a reed as a transition piece, which is placed between the metal push rod and the push rod. This solution can achieve elastic contact, but the installation and positioning are complicated, the product volume is large, which is not conducive to the miniaturization development trend of the device, and the reed is made of metal, and there will be friction loss with the metal push rod. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a flexible transmission structure of a programmable step attenuator based on a sealing ring, which has low processing precision and increases the service life of the transmission structure.

[0004] The technical solution of the present invention is:

[0005] The sealing ring-based programmable step attenuator flexible transmission structure includes a lower armature fixed to the bottom end of the iron core and two push rods connected to the lower armature, the lower armature is provided with two U-shaped grooves, each push rod includes a rod body and a head connected to the top end of the rod body, the diameter of the head is larger than the diameter of the rod body, an annular groove is provided on the head, the part of the head located in the annular groove is the insertion rod part, the insertion rod part is sleeved with an upper sealing ring and a lower sealing ring, the insertion rod part of each push rod is horizontally inserted into the corresponding U-shaped groove, the upper sealing ring and the lower sealing ring on the push rod are in close contact with the upper end face and the lower end face of the lower armature respectively.

[0006] The notches of the two U-shaped grooves on the lower armature face oppositely.

[0007] The width of the notch of the U-shaped groove is greater than the diameter of the rod insertion part of the top rod.

[0008] The outer diameter of the upper sealing ring and the outer diameter of the lower sealing ring are both larger than the diameter of the head of the push rod.

[0009] Advantages of the present invention:

[0010] The present invention installs upper and lower sealing rings on the head of the push rod. The elasticity of the upper and lower sealing rings fixes the iron core of the electromagnetic drive unit and the push rod together. During the switching action of the programmable step attenuator, the upper and lower sealing rings reduce the force impact during the switching process. The flexible structural design makes the service life of the programmable step attenuator product reach more than 5 million times. The diameter of the push rod insertion part of the present invention is slightly smaller than the notch width of the U-shaped groove. Through free alignment, the processing and installation accuracy problems between the electromagnetic drive unit and the microwave attenuation unit are solved, and the jamming phenomenon caused by inaccurate equal position is avoided, and the product qualification rate is greatly improved. The present invention adopts a sealing ring that does not require additional installation design, and the finished product volume is very small, which meets the technical development trend of intelligent and miniaturized test instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention.

[0012] Figure 2 It is a schematic cross-sectional view of the structure of the present invention installed on an electromagnetic drive unit.

[0013] Figure 3 It is a structural schematic diagram of the ejector rod of the present invention. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] See Figure 1-Figure 3The flexible transmission structure of the programmable step attenuator based on the sealing ring includes a lower armature 2 fixed to the bottom end of the iron core 1 and two push rods 3 connected to the lower armature 2. The lower armature 2 is provided with two U-shaped grooves 4, and the notches of the two U-shaped grooves 4 face oppositely. Each push rod 3 includes a rod body 31 and a head 32 connected to the top of the rod body 31. The diameter of the head 32 is larger than the diameter of the rod body 31. The head 32 is provided with an annular groove. The part of the head 32 located in the annular groove is the plug-in rod part 33. An upper sealing ring 5 and a lower sealing ring 6 are sleeved on the rod part 33. The outer diameters of the upper sealing ring 5 and the lower sealing ring 6 are both larger than the diameter of the top rod head 32, so that the upper sealing ring 5 and the lower sealing ring 6 fully support the two ends of the insertion rod part 33. The insertion rod part 33 of each top rod is horizontally inserted into the corresponding U-shaped groove 4. The groove width of the U-shaped groove 4 is larger than the diameter of the insertion rod part 33 of the top rod. The upper sealing ring 5 and the lower sealing ring 6 on the top rod are in close contact with the upper end face and the lower end face of the lower armature 2 respectively.

[0016] See Figure 2 During the switching action of the program-controlled step attenuator, the iron core 1 moves back and forth in the inner hole of the coil frame 7 of the electromagnetic drive unit, and the top rod 3 moves back and forth in the mounting hole of the microwave attenuation unit support 8.

[0017] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A programmable step attenuator flexible transmission structure based on a sealing ring, characterized in that: It includes a lower armature fixed to the bottom end of the iron core and two push rods connected to the lower armature, the lower armature is provided with two U-shaped grooves, each push rod includes a rod body and a head connected to the top end of the rod body, the diameter of the head is larger than the diameter of the rod body, an annular groove is provided on the head, the part of the head located in the annular groove is the plug rod part, the plug rod part is sleeved with an upper sealing ring and a lower sealing ring, the plug rod part of each push rod is horizontally inserted into the corresponding U-shaped groove, and the upper sealing ring and the lower sealing ring on the push rod are in close contact with the upper end face and the lower end face of the lower armature respectively; The notches of the two U-shaped grooves on the lower armature face oppositely, and the notch width of the U-shaped groove is greater than the diameter of the rod insertion part of the push rod.

2. According to the sealing ring-based programmable step attenuator flexible transmission structure of claim 1, it is characterized by: The outer diameter of the upper sealing ring and the outer diameter of the lower sealing ring are both larger than the diameter of the head of the push rod.

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