CN107069151B - Waveguide rotary joint with adjustable gap - Google Patents
Waveguide rotary joint with adjustable gap Download PDFInfo
- Publication number
- CN107069151B CN107069151B CN201710367047.5A CN201710367047A CN107069151B CN 107069151 B CN107069151 B CN 107069151B CN 201710367047 A CN201710367047 A CN 201710367047A CN 107069151 B CN107069151 B CN 107069151B
- Authority
- CN
- China
- Prior art keywords
- waveguide
- bearing
- waveguide tube
- inner ring
- rotary joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/06—Movable joints, e.g. rotating joints
- H01P1/062—Movable joints, e.g. rotating joints the relative movement being a rotation
- H01P1/066—Movable joints, e.g. rotating joints the relative movement being a rotation with an unlimited angle of rotation
- H01P1/067—Movable joints, e.g. rotating joints the relative movement being a rotation with an unlimited angle of rotation the energy being transmitted in only one line located on the axis of rotation
Landscapes
- Waveguide Connection Structure (AREA)
Abstract
The invention relates to a waveguide rotary joint with adjustable clearance, which comprises a waveguide rotary component and a waveguide tube seat, wherein the waveguide rotary component is inserted into the waveguide tube seat, and the right end surface of the waveguide rotary component is contacted with the contact surface of the waveguide tube seat; the inner ring of the bearing and the waveguide tube are relatively fixed through the clamping action of the first limiting bulge and the inner ring locking nut; the outer ring of the bearing and the bearing shell are relatively fixed through the clamping action of the bearing pressing thread and the second limiting bulge; the bearing shell and the waveguide tube seat are fixed by the adjusting screws penetrating through the small holes and the small threaded holes, so that the waveguide tube and the waveguide tube seat rotate circumferentially relative to each other, and finally, the non-jumping gap adjustment between the waveguide tube and the waveguide tube seat is realized. The waveguide rotary joint realizes non-jumping rapid clearance adjustment in structure, omits a choke groove, has small standing wave and insertion loss, completely covers the bandwidth of a standard waveguide tube with working bandwidth, and has simple integral processing technology and simple dimension chain inspection.
Description
Technical Field
The invention relates to the technical field of microwave communication, in particular to a waveguide rotary joint with adjustable clearance.
Background
In a microwave communication system or a radar system, the antenna orientation is generally required to be capable of performing 360-degree continuous rotation, pitching-25-120-degree rotation and polarization 0-270-degree rotation, so that the antenna is ensured to realize the functions of signal search, tracking, target measurement and the like. At the moment, a waveguide rotary joint or a coaxial rotary joint must be arranged between the feed source and the network, so that the effective transmission of microwave signals can be ensured.
The waveguide rotary joint is usually made of metal and is arranged between the dynamic antenna system and the static system so as to ensure the effective transmission of microwave signals.
A waveguide (waveguide) is a component for guiding electromagnetic waves in a microwave rotary joint. The waveguide generally refers to a hollow metal tube, and can be divided into a rectangular waveguide, a circular waveguide and the like according to different shapes of the cross section of the waveguide, the rectangular waveguide and the circular waveguide are two waveguide forms which are most widely applied at present, electromagnetic waves are transmitted in the metal tube, and loss is low. The waveguide tube wall is generally made of metals such as copper, aluminum and the like, sometimes the inner wall is also plated with silver or gold, the conductivity of the waveguide tube wall is very high, an air medium of the waveguide tube inner wall is a channel for transmitting electromagnetic waves, the channel is simply called as a channel, and the propagation of the electromagnetic waves in the waveguide channel is limited by the waveguide tube inner wall, reflected and the like.
The existing circular waveguide rotary joints in the market mostly use non-contact joints, and because a certain gap is formed between the waveguide tube and the waveguide tube seat, the standing wave is large, and the insertion loss is also large; in order to reduce the standing wave ratio and the insertion loss, choke grooves are designed in contactless joints at places where the electrical performance requirements are high. Such as: patent application No.: CN201220374567.1, chinese patent discloses a waveguide channel for microwave rotary joint, which comprises a first waveguide tube and a second waveguide tube connected end to end, wherein the first waveguide tube can rotate relative to the second waveguide tube, a choke channel is arranged at the connection position of the first waveguide tube and the second waveguide tube, and the choke channel is communicated with the main channel in the first waveguide tube and the second waveguide tube. The first waveguide tube in the patent can rotate relative to the second waveguide tube, so that the transmission speed of electromagnetic waves in a main channel is improved, and meanwhile, a choking channel is designed at the joint of the first waveguide tube and the second waveguide tube, so that the electromagnetic waves on the waveguide wall provide an effective low-impedance channel when flowing through a gap at the joint of the first waveguide tube and the second waveguide tube, and the electrical performance index of a product is not influenced. However, the rotary joint having the choke groove (i.e., the choke channel in patent CN 201220374567.1) has a high reflection coefficient and a large power capacity, but has a narrow operating band, a large voltage standing wave ratio (large reflection loss of electromagnetic waves), and a large insertion loss (large attenuation width of electromagnetic signals). When the operating frequency is changed, the electrical performance index is reduced because the size of the choke groove cannot be changed. Choke groove designs are computationally complex, often requiring final experimental determination, and are costly to design and manufacture.
With the rapid development of satellite communication, the working frequency band is wider and wider, and the contradiction between the choke characteristic and the wide frequency band exists in the design of the wide frequency band waveguide rotary joint. The broadband waveguide rotary joint is required to be capable of rotating stably at a joint, and good electric connection between the movable waveguide and the fixed waveguide is also required to be ensured, so that a broadband coverage system can achieve good standing waves and low insertion loss.
In addition, chinese patent CN201621018239.2 discloses a waveguide rotary joint, which includes a first waveguide coaxial converter, a second waveguide coaxial converter, a first bearing and a second bearing, where the first waveguide coaxial converter includes a first ridge and a first connecting piece, the second waveguide coaxial converter includes a second ridge and a second connecting piece, the second connecting piece is inserted into the first connecting piece, the first bearing and the second bearing are sleeved on the second connecting piece, the first ridge and the second ridge are detachably connected, and the first waveguide coaxial converter, the second waveguide coaxial converter, the first bearing and the second bearing coaxially rotate. In the patent, a bearing is introduced as a rotating member between the first waveguide coaxial converter and the second waveguide coaxial converter, but on one hand, the structure is complex, the sizes of the first ridge and the second ridge have strict requirements, the processing technology is complex, auxiliary components such as tuning screws are required, and on the other hand, a plurality of choke grooves are required to be processed to ensure the electrical continuity, thereby further increasing the processing difficulty.
Yao-Y (Yao-Y) is designed in a contact type waveguide rotary joint mechanism, electronic mechanical engineering, 2007, 23(1) and P42, and a contact type rotary joint is designed, wherein an elastic pipe with a slit is used as a connecting piece of the waveguide rotary joint, and the elastic pipe is used for replacing a choke groove, so that the requirement of broadband coverage is met. However, the processing technology of the rotary joint is complex, seven grooves with the period of 1.3mm need to be processed by adopting a linear cutting technology, the adjacent grooves are intersected by 90 degrees, the groove width is 0.3mm +/-0.05 mm, the wall thickness of the elastic waveguide is 3.55 +/-0.05 mm, the cost is high, and the opened elastic groove still has influence on the electrical performance under the actual working condition; on the other hand, when the contact rotary joint is worn and operated for a long time, the rotation moment is increased due to wear and deformation, and the rotation is not flexible.
In view of this, the structural design of the contact type circular waveguide rotary joint still has a large promotion space, so that on the premise of not increasing the structural complexity and the processing difficulty, the standing-wave ratio and the insertion loss are reduced, the electrical performance is ensured, and the bandwidth of the standard waveguide tube is covered as much as possible.
Disclosure of Invention
In order to solve the problems that the size of the choke groove is complex to calculate when the waveguide rotary joint with the choke groove is manufactured in the prior art, the choke groove needs to be determined by tests, and the design and manufacturing cost is high; the waveguide rotary joint with the choke groove has the problems that the working frequency band is narrow, the voltage standing wave ratio is large, the insertion loss is large, and once the working frequency is changed, the electrical performance index is reduced because the size of the choke groove cannot be changed. The technical problem to be solved by the invention is realized by the following technical scheme:
the waveguide rotating joint with the adjustable gap comprises a waveguide rotating assembly and a waveguide tube seat, wherein the waveguide rotating assembly is inserted into the waveguide tube seat, and the right end face of the waveguide rotating assembly is in contact with the contact surface of the waveguide tube seat.
The waveguide rotating assembly comprises a waveguide tube, a bearing shell, a bearing outer sleeve, a bearing inner sleeve, a bearing locking nut and an inner ring locking nut.
The waveguide tube is in a hollow tubular shape, a circle of first limiting protrusion is arranged on the outer wall of the middle of the waveguide tube, an external thread is arranged on the outer wall of the right end of the waveguide tube, the external thread is matched with an internal thread of an inner ring locking nut arranged on the outer wall of the right end of the waveguide tube in a sleeved mode, and the bearing is limited by adjusting the position of the inner ring locking nut.
The number of the bearings is at least two, the inner ring of each bearing is sleeved on the outer wall of the waveguide tube, and the outer ring of each bearing is in contact with the inner surface of the bearing shell; the two adjacent bearings are positioned through a bearing inner sleeve and a bearing outer sleeve which are sleeved with each other, the bearing inner sleeve is directly sleeved on the waveguide tube, and the bearing outer sleeve is coaxially sleeved outside the bearing inner sleeve and is in contact with the inner surface of the bearing shell; the central axes of the bearing, the bearing inner sleeve and the bearing outer sleeve are all coincided with the central axis of the waveguide tube.
The left end face of the left end bearing inner ring is in contact with the right side face of the first limiting protrusion, the right end face of the right end bearing inner ring is in contact with the left end face of the inner ring locking nut, and the inner ring of the bearing and the waveguide tube are relatively fixed through the clamping effect of the first limiting protrusion and the inner ring locking nut.
The right end of the bearing shell is provided with a second limiting bulge which extends towards the direction of the waveguide tube and is vertical to the axial direction of the waveguide tube; the left end surface of the second limiting bulge is flush with the left end surface of the inner ring locking nut; the bearing locking nut fixes the outer ring of the left end bearing on the bearing shell through the bearing pressing thread, the right end of the outer ring of the right end bearing is in contact with the left end face of the second limiting bulge, and the outer ring of the bearing is fixed relative to the bearing shell through the clamping action of the bearing pressing thread and the second limiting bulge.
A first annular protruding part is arranged on the periphery of one side, close to the waveguide tube seat, of the bearing shell, and a plurality of small holes are uniformly formed in the first annular protruding part along the axial direction of the waveguide tube; a second annular protruding part is arranged on the left end face of the waveguide tube seat, and small threaded holes corresponding to the small holes in the first annular protruding part are uniformly formed in the second annular protruding part; the adjusting screw penetrates through the small hole and the small threaded hole to fix the bearing shell and the waveguide tube seat; the waveguide and the waveguide holder can be coaxially and circumferentially rotated relative to each other by means of bearings.
Furthermore, the number of the adjusting screws is at least 3, and the number of the small holes and the small thread holes corresponding to the adjusting screws is at least 3.
Furthermore, a gap compensation pad is arranged between the right end face of the second limiting protrusion of the bearing shell and a shaft shoulder on the inner wall of the waveguide tube seat, and the gap compensation pad is of an elastic structure and used for eliminating a gap between the bearing shell and the waveguide tube seat.
Further, the outer wall of the bearing housing at the right end of the first annular protrusion has a first guide surface, and the inner wall of the waveguide seat at the right end of the second annular protrusion has a corresponding second guide surface; after installation, the first guide surface and the second guide surface are overlapped to ensure that the central axes of the waveguide tube and the waveguide tube seat are overlapped.
Furthermore, a thread fastening glue is coated at the joint of the inner ring lock nut and the bearing pressing thread of the bearing shell; the joint of the adjusting screw and the small hole and the small threaded hole is coated with thread fixing glue; and a joint of the external thread on the outer wall at the right end of the waveguide tube and the internal thread of the inner ring locking nut is coated with thread fixing glue.
Further, the clearance compensation pad is made of polyurethane rubber with the Shore hardness of 74, and the waveguide tube seat are made of aluminum, copper or stainless steel.
Compared with the prior art, the invention has the beneficial effects that:
1. the gap-adjustable waveguide rotary joint is structurally characterized in that the waveguide rotary component is in contact with the waveguide tube seat, the first protruding part of the bearing shell is fastened with the second protruding part of the waveguide tube seat through the adjusting screw, and finally zero-gap contact between the waveguide tube and the waveguide tube seat can be achieved.
2. Compared with the prior widely used rotary joint with the choke groove, the non-jumping gap structure design of the waveguide rotary joint with the adjustable gap of the invention omits the choke groove, overcomes the defects of complicated calculation of the size of the choke groove, need of experimental determination and high design and manufacturing cost in the prior art; and the waveguide rotary joint with the choke groove has the problems of narrow working frequency band, large voltage standing wave ratio and large insertion loss, and the electrical performance index is reduced because the size of the choke groove can not be changed once the working frequency is changed.
3. When the waveguide rotary joint with the adjustable gap is assembled, a network analyzer is accessed to measure the insertion loss, and simultaneously, the non-hopping gap adjustment is carried out, so that the position with the minimum insertion loss can be finally determined; since this adjustment is continuous and jump-free, the contact surface gap can theoretically be adjusted to 0; the waveguide rotary joint manufactured according to the assembly mode has the advantages that the contact surface of the waveguide tube and the waveguide tube seat is in non-pressure surface contact, and the waveguide rotary joint usually rotates only at a low speed, so that the abrasion of the contact surface is extremely small, the service life is long, and the problems that the existing contact type rotary joint is large in rotating moment and inflexible in rotation due to contact abrasion and deformation in long-term use are solved.
4. The waveguide rotary joint with the adjustable gap adopts the coaxially arranged bearing as a supporting rotating body between the waveguide tube and the waveguide tube seat, so that the friction coefficient in the motion process is reduced, and the rotation precision of the waveguide rotary joint is ensured; and the bearing, the bearing inner sleeve, the bearing outer sleeve and the waveguide tube are coaxially arranged, so that the stability of the waveguide rotary joint is improved, better impedance matching can be obtained, and the microwave loss is reduced.
5. The gap-adjustable waveguide rotary joint is provided with a first guide surface on the outer wall of the right end of the bearing shell, and a corresponding second guide surface on the inner wall of the left end of the waveguide tube seat.
6. The waveguide tube and the waveguide tube seat in the gap-adjustable waveguide rotary joint are made of good metal conductors such as aluminum, copper, stainless steel and the like, and the reflection of microwaves can be reduced due to higher conductivity, so that the microwave loss is reduced.
7. The waveguide rotary joint with the adjustable gap is simple in transfer, and particularly, compared with the fixing mode between other bearing shells and waveguide tube seats, the waveguide rotary joint with the adjustable gap is easier to process and lower in cost in the mode that the bearing shells and the waveguide tube seats are fixed by fastening the adjusting screws.
Drawings
FIG. 1 is a cross-sectional view of an adjustable gap waveguide rotary joint of the present invention;
FIG. 2 is a cross-sectional view of a waveguide rotary assembly in the adjustable gap waveguide rotary joint of the present invention;
FIG. 3 is a cross-sectional view of a waveguide hub in the adjustable gap waveguide rotary joint of the present invention;
FIG. 4 is a sequence diagram of the tightening of 6 adjustment screws in the gap adjustable waveguide rotary joint of the present invention;
in the figure: 1. a waveguide; 2. a bearing lock nut; 3. a bearing; 4. a bearing housing; 5. adjusting the screw; 6. a bearing housing; 7. a bearing inner sleeve; 8. a gap compensation pad; 9. a waveguide tube seat; 10. an inner ring lock nut; 11. a contact surface; 12. a first limit protrusion; 13. An external thread; 14. a second limit bulge; 15. the bearing compresses the screw thread; 16. a first annular projection; 17. a second annular protrusion; 18. a shaft shoulder; 19. a first guide surface; 20. a second guide surface.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, are used for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature may be "on", "under" or "external" to the second feature, such that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Example 1:
in order to solve the defects of large standing-wave ratio and large insertion loss of a non-contact waveguide rotary joint in the prior art and solve the problems that the size of a choke groove is complex to calculate and needs to be determined by tests during manufacturing of the waveguide rotary joint with the choke groove, and the design and manufacturing cost is high; and the waveguide rotary joint with the choke groove has a narrow working frequency band, and once the working frequency is changed, the electrical performance index is reduced because the size of the choke groove cannot be changed, the invention designs an adjustable gap waveguide rotary joint without the choke groove, and the specific structure is shown in figures 1-3.
The waveguide rotary joint with the adjustable gap comprises a waveguide rotary component and a waveguide base 9, wherein the waveguide rotary component is inserted into the waveguide base 9, and the right end surface of the waveguide rotary component is in contact with a contact surface 11 of the waveguide base 9.
The waveguide rotating assembly comprises a waveguide tube 1, a bearing 3, a bearing shell 4, a bearing outer sleeve 6, a bearing inner sleeve 7, a bearing locking nut 2 and an inner ring locking nut 10.
The waveguide tube 1 is in a hollow tubular shape, a circle of first limiting protrusion 12 is arranged on the outer wall of the middle of the waveguide tube 1, an external thread 13 is arranged on the outer wall of the right end of the waveguide tube 1, the external thread 13 is matched with an internal thread of an inner ring locking nut 10 sleeved on the outer wall of the right end of the waveguide tube 1, and the bearing 3 is limited by adjusting the position of the inner ring locking nut 10.
The number of the bearings 3 is at least two, the inner ring of each bearing 3 is sleeved on the outer wall of the waveguide tube 1, and the outer ring of each bearing 3 is in contact with the inner surface of the bearing shell 4; the adjacent two bearings 3 are positioned by a bearing inner sleeve 7 and a bearing outer sleeve 6 which are sleeved with each other, the bearing inner sleeve 7 is directly sleeved on the waveguide tube 1, and the bearing outer sleeve 6 is coaxially sleeved outside the bearing inner sleeve 7 and is contacted with the inner surface of the bearing shell 4; the central axes of the bearing 3, the bearing inner sleeve 7 and the bearing outer sleeve 6 are all superposed with the central axis of the waveguide tube 1.
The left end face of the inner ring of the left end bearing 3 is in contact with the right end face of the first limiting protrusion 12, the right end face of the inner ring of the right end bearing 3 is in contact with the left end face of the inner ring locking nut 10, and the inner ring of the bearing 3 and the waveguide tube 1 are relatively fixed through clamping action of the first limiting protrusion 12 and the inner ring locking nut 10.
The right end of the bearing shell 4 is provided with a second limiting bulge 14 which extends towards the direction of the waveguide tube 1 and is vertical to the axial direction of the waveguide tube 1; the left end surface of the second limiting bulge 14 is flush with the left end surface of the inner ring locking nut 10; the bearing locking nut 2 fixes the outer ring of the left end bearing 3 on the bearing shell 4 through the bearing pressing thread 15; the right-hand member of the outer lane of right-hand member bearing 3 contacts with the left end face of the protruding 14 of second spacing, compresses tightly screw thread 15 and the protruding 14 clamping effect of second spacing through the bearing, realizes the relative fixation between the outer lane of bearing 3 and bearing housing 4.
A first annular protruding part 16 is arranged on the periphery of one side, close to the waveguide tube seat 9, of the bearing shell 4, and a plurality of small holes are uniformly formed in the first annular protruding part 16 along the axial direction of the waveguide tube 1; a second annular protruding part 17 is arranged on the left end face of the waveguide tube seat 9, and small threaded holes corresponding to the small holes in the first annular protruding part 16 are uniformly formed in the second annular protruding part 17; the adjusting screw 5 penetrates through the small hole and the small thread hole to fix the bearing shell 4 and the waveguide tube seat 9; the number of the adjusting screws 5 is at least 3, and the number of the small holes and the small thread holes corresponding to the adjusting screws 5 is at least 3. The waveguide 1 and the waveguide holder 9 can be rotated coaxially relative to one another in the circumferential direction by means of the bearing 3.
The joint of the inner ring lock nut 10 and the bearing pressing thread 15 of the bearing shell 4 is coated with thread fastening glue; the joint of the adjusting screw 5 and the small hole and the small threaded hole is coated with thread fixing glue; and thread fixing glue is coated at the joint of the external thread 13 on the outer wall at the right end of the waveguide tube 1 and the internal thread of the inner ring locking nut 10. The thread fastening glue has the functions of bonding and sealing, can be rapidly polymerized and cured at room temperature under the catalysis condition when the glue coating surface is isolated from air, can prevent the threads from loosening and ensures the structural reliability of the rotary joint. Various common thread rubbers can be used in the embodiment, preferably a medium-strength thread rubber for easy assembly and disassembly.
The bearing inner sleeve 7 and the waveguide tube 1 are in clearance fit, the bearing inner sleeve 7 and the waveguide tube 1 can be in interference fit, clearance fit or transition fit, and the clearance fit is convenient to assemble and disassemble, so that the clearance fit is preferred.
The waveguide tube after being installed can realize the effective transmission of microwave signals between two waveguide tubes which rotate relatively.
The gap-adjustable waveguide rotary joint of the embodiment structurally adopts the waveguide rotary component to be in contact with the waveguide tube seat, and the first protruding part of the bearing shell is fastened with the second protruding part of the waveguide tube seat through the adjusting screw, so that zero-gap contact between the waveguide tube and the waveguide tube seat can be finally realized, and the defects that the traditional non-contact waveguide rotary joint is large in standing wave ratio, namely large in electromagnetic wave reflection loss, large in insertion loss, namely large in electromagnetic signal attenuation amplitude are overcome. In addition, the non-jump gap structure design of the waveguide rotary joint with the adjustable gap of the embodiment omits a choke groove, and compared with the existing widely-used rotary joint with the choke groove, the non-jump gap structure design of the waveguide rotary joint with the adjustable gap of the embodiment overcomes the defects that the size calculation of the choke groove is complex, the design and the manufacturing cost are high, and the choke groove needs to be determined by experiments; and the waveguide rotary joint with the choke groove has the problems of narrow working frequency band, large voltage standing wave ratio and large insertion loss, and the electrical performance index is reduced because the size of the choke groove can not be changed once the working frequency is changed.
The waveguide rotary joint adopts a bearing which is coaxially arranged between the waveguide tube and the waveguide tube seat as a supporting rotary body, so that the friction coefficient in the motion process of the waveguide rotary joint is reduced, and the rotation precision of the waveguide rotary joint is ensured; and the bearing, the bearing inner sleeve, the bearing outer sleeve and the waveguide tube are coaxially arranged, so that the stability of the waveguide rotary joint is improved, better impedance matching can be obtained, and the microwave loss is reduced.
The bearing among the bearing assembly is two at least, and the design reason lies in, under operating condition, can take place the vibration with the part that waveguide rotary joint is connected to the waveguide can receive bending torsion and vertical pressure, when only setting up a bearing, the bearing department atress is too big, and intensity is not enough, and waveguide pipe bearing department leads to the damage with the atress too big, therefore at least two bearings can be with the atress dispersion, and the protection waveguide pipe does not receive the damage. If the number of the bearings contained in the bearing assembly is large, the installation and manufacturing difficulty is improved, and the stability and the reliability of the performance are not easy to guarantee, so that the common bearing assembly is provided with two bearings. The bearings are positioned, isolated and conducted by using the bearing inner sleeve and the bearing outer sleeve.
The waveguide tube and the waveguide tube seat are made of good metal conductors such as aluminum, copper, stainless steel and the like, and the reflection of microwaves can be reduced due to higher conductivity, so that the microwave loss is reduced.
In addition, the waveguide rotary joint with the adjustable gap is simple in transfer, and particularly, compared with the fixing mode between other bearing shells and the waveguide seat, the waveguide rotary joint with the adjustable gap is easier to process and lower in cost in the mode that the bearing shells and the waveguide seat are fixed by the adjusting screws in a fastening mode.
Example 2:
on the basis of embodiment 1, a gap compensation pad 8 is disposed between a right end surface of the second limiting protrusion 14 of the bearing housing 4 and a shaft shoulder 18 on the inner wall of the waveguide tube seat 9, the gap compensation pad 8 is of an elastic structure and can be made of rubber with high hardness, and the gap compensation pad 8 can also be made of a belleville spring or a common helical compression spring. In the present embodiment, the gap compensation pad 8 is preferably made of polyurethane rubber with a shore hardness of 74.
In the installation, the assembled waveguide tube rotating assembly is slowly screwed into the right end of the waveguide tube seat, the bearing shell gradually compresses the gap compensation pad in the process, the waveguide tube is in contact with the waveguide tube seat, the elastic gap compensation pad can eliminate the thread gap between the bearing shell and the waveguide tube seat, and the reliability and the stability of surface contact are ensured.
After the waveguide rotary joint of the embodiment is initially installed, the gap between the contact surfaces of the waveguide tube 1 and the waveguide tube seat 9 is about 0.1 mm-0.3 mm, when the gap is adjusted, the gap compensation piece 8 fills the gap between the bearing shell 4 and the waveguide tube seat 9, when the bearing shell 4 rotates rightwards, the gap compensation piece 8 eliminates the thread gap of the thread pair between the bearing shell 4 and the waveguide tube seat 9 by means of elasticity of the gap compensation piece, so that a stable gap is formed between the right end surface of the waveguide tube 1 and the left end surface of the waveguide tube seat 9, and a certain effect of preventing the thread from loosening is achieved. The gap adjustment is continuous and non-jumping, so that theoretically the gap between the right end surface of the waveguide 1 and the left end surface (contact rotating surface) of the waveguide seat 9 can reach 0.
Example 3:
on the basis of embodiment 1, the outer wall of the bearing housing 4 at the right end of the first annular projection 16 of the present embodiment has a first guide surface 19, and the inner wall of the waveguide holder 9 at the right end of the second annular projection 17 has a corresponding second guide surface 20; after installation, the first guide surface 19 and the second guide surface 20 are overlapped to ensure that the central axes of the waveguide 1 and the waveguide holder 9 are overlapped, thereby realizing the coaxiality and the axial parallelism of the contact surfaces of the waveguide 1 and the waveguide holder 9 and avoiding the condition of poor contact.
And when each part is designed, the dimensional tolerance of the part is optimized, and the dimensional chain is controlled. The waveguide rotary joint after the installation realizes the effective transmission of microwave signals between the waveguide tube and the waveguide tube seat which rotate relatively.
The relative rotation surfaces of the waveguide rotation joints with adjustable gaps in the embodiments 1 to 3 can realize non-jumping gap adjustment until no pressure contact is realized, at this time, both ends of the waveguide tube and the waveguide tube seat are theoretically considered to be a complete waveguide tube, no choke groove and no gap, the reflection coefficient of the microwave is greatly reduced, and the voltage standing wave is small and close to 1; the insertion loss is low, approaching a complete waveguide. The operating bandwidth of the waveguide rotary joints of examples 1 to 3 completely covered the bandwidth of the standard waveguide. In addition, the waveguide rotary joint does not comprise a choke groove with complicated size calculation, and the whole processing technology is simple; the inspection size chain is also simple, and the inspection efficiency is high.
Within the full bandwidth, the standing wave ratio of the waveguide rotary joint with the adjustable gap of the embodiment 1-the embodiment 3 is only 0.01 higher than that of a complete waveguide tube with the same length, and the insertion loss is only 0.015dB higher than that of the complete waveguide tube with the same length. The waveguide rotary joint has good stability, can continuously rotate at any angle of 0-360 degrees along the central axis, and has insertion loss fluctuation less than 0.01dB in the angle change process.
Assembling and debugging processes of the waveguide rotary joint with the adjustable gap of the embodiment 1 to the embodiment 3 are as follows:
1. firstly, sequentially sleeving a first bearing, a bearing inner sleeve, a bearing outer sleeve and a second bearing on a waveguide tube, then screwing an inner ring locking nut into an external thread on the outer wall of the waveguide tube, and coating thread glue at the joint of the inner ring locking nut and the external thread; inserting the assembled components into the left end opening of the bearing housing until the right end of the bearing assembly is contacted by the right end wall of the bearing housing; and screwing the bearing locking nut into the bearing pressing thread of the bearing shell, coating thread glue at the joint of the bearing locking nut and the bearing pressing thread, and assembling to obtain the rotating assembly.
2. The clearance compensation pad is arranged in a central through hole of the waveguide tube seat and clamped at a shaft shoulder, and then the assembled rotating assembly is arranged on the left side of the clearance compensation pad until a first guide surface of the bearing shell is coincided with a second guide surface of the waveguide tube seat; the adjustment screws are then screwed through the small holes in the first annular projection of the bearing housing into the small threaded holes in the second annular projection of the waveguide holder, and the 6 adjustment screws are tightened in the sequence shown in fig. 4, which ensures that the waveguide is balanced when it is pushed against the contact surface of the waveguide holder. And the adjusting screw is screwed by a hand to enable the waveguide port at the right end of the waveguide tube to start moving rightwards, and when the adjusting screw cannot be screwed manually, the initial installation is finished.
3. Connecting the left end of the waveguide tube and the right end of the waveguide tube seat to a network analyzer, slowly and clockwise rotating an adjusting screw by using a wrench, observing the insertion loss on the network analyzer, and ensuring that a rotary joint can flexibly rotate when the insertion loss reaches the minimum value, stopping rotation and completing debugging. And at the moment, the installation and debugging of the adjustable gap waveguide rotary joint are finished. Since the adjustment is continuous and free of jumps, the gap between the contact rotating surfaces can theoretically reach 0.
4. After debugging is finished, coating thread fixing glue on the joint of the adjusting screw and the small hole and the small threaded hole for clearance fixing; the waveguide rotary joint usually rotates only at a low speed, so that the contact surface is extremely little worn and has a long service life.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. A waveguide rotary joint with adjustable clearance is characterized in that: the waveguide rotating assembly is inserted into the waveguide base (9), and the right end face of the waveguide rotating assembly is in contact with a contact surface (11) of the waveguide base (9);
the waveguide rotating assembly comprises a waveguide tube (1), a bearing (3), a bearing outer shell (4), a bearing outer sleeve (6), a bearing inner sleeve (7), a bearing locking nut (2) and an inner ring locking nut (10);
the waveguide tube (1) is in a hollow tubular shape, a circle of first limiting bulges (12) are arranged on the outer wall of the middle of the waveguide tube, external threads (13) are arranged on the outer wall of the right end of the waveguide tube (1), the external threads (13) are matched with internal threads of an inner ring locking nut (10) sleeved on the outer wall of the right end of the waveguide tube (1), and the position of the inner ring locking nut (10) is adjusted to limit the bearing (3);
the number of the bearings (3) is at least two, the inner ring of each bearing (3) is sleeved on the outer wall of the waveguide tube (1), and the outer ring of each bearing (3) is in contact with the inner surface of the bearing shell (4); the two adjacent bearings (3) are positioned through a bearing inner sleeve (7) and a bearing outer sleeve (6) which are sleeved with each other, the bearing inner sleeve (7) is directly sleeved on the waveguide tube (1), and the bearing outer sleeve (6) is coaxially sleeved outside the bearing inner sleeve (7) and is in contact with the inner surface of the bearing shell (4); the central axes of the bearing (3), the bearing inner sleeve (7) and the bearing outer sleeve (6) are all superposed with the central axis of the waveguide tube (1);
the left end surface of the inner ring of the left end bearing (3) is contacted with the right end surface of the first limiting bulge (12), the right end surface of the inner ring of the right end bearing (3) is contacted with the left end surface of the inner ring locking nut (10), and the inner ring of the bearing (3) and the waveguide tube (1) are relatively fixed through the clamping action of the first limiting bulge (12) and the inner ring locking nut (10);
a second limiting bulge (14) which extends towards the direction of the waveguide tube (1) and is vertical to the axial direction of the waveguide tube (1) is arranged at the right end of the bearing shell (4); the left end surface of the second limiting bulge (14) is flush with the left end surface of the inner ring locking nut (10); a bearing pressing thread (15) is arranged on the left-end inner ring of the bearing shell (4), and the bearing locking nut (2) fixes the outer ring of the left-end bearing (3) on the bearing shell (4) through the bearing pressing thread (15); the right end of the outer ring of the right-end bearing (3) is in contact with the left end face of the second limiting protrusion (14), and the outer ring of the bearing (3) and the bearing shell (4) are relatively fixed through the clamping action of the bearing pressing thread (15) and the second limiting protrusion (14);
a first annular protruding part (16) is arranged on the periphery of one side, close to the waveguide tube seat (9), of the bearing shell (4), and a plurality of small holes are uniformly formed in the first annular protruding part (16) along the axial direction of the waveguide tube (1); a second annular protruding part (17) is arranged on the left end face of the waveguide tube seat (9), and small threaded holes corresponding to the small holes in the first annular protruding part (16) are uniformly formed in the second annular protruding part (17); the adjusting screw (5) penetrates through the small hole and the small thread hole to fix the bearing shell (4) and the waveguide tube seat (9); the waveguide (1) and the waveguide holder (9) can realize coaxial relative circumferential rotation by means of the bearing (3).
2. The gap adjustable waveguide rotary joint according to claim 1, wherein: a clearance compensation pad (8) is arranged between the right end face of a second limiting protrusion (14) of the bearing shell (4) and a shaft shoulder (18) on the inner wall of the waveguide tube seat (9), and the clearance compensation pad (8) is of an elastic structure and used for eliminating a clearance between the bearing shell (4) and the waveguide tube seat (9).
3. The gap adjustable waveguide rotary joint according to claim 1, wherein: the outer wall of the bearing housing (4) at the right end of the first annular projection (16) has a first guide surface (19), and the inner wall of the waveguide holder (9) at the right end of the second annular projection (17) has a corresponding second guide surface (20); after mounting, the first guide surface (19) and the second guide surface (20) are superposed to ensure that the central axes of the waveguide (1) and the waveguide holder (9) are superposed.
4. The gap adjustable waveguide rotary joint according to claim 1, wherein: the number of the adjusting screws (5) is at least 3, and the number of the small holes and the small thread holes corresponding to the adjusting screws (5) is at least 3.
5. The gap adjustable waveguide rotary joint according to claim 1, wherein: the joint of the inner ring locking nut (10) and the bearing pressing thread (15) of the bearing shell (4) is coated with thread fastening glue; the joint of the adjusting screw (5) and the small hole and the small threaded hole is coated with thread fixing glue; and a joint of the external thread (13) on the outer wall of the right end of the waveguide tube (1) and the internal thread of the inner ring locking nut (10) is coated with thread fixing glue.
6. The gap adjustable waveguide rotary joint according to claim 2, wherein: the clearance compensation pad (8) is made of polyurethane rubber with the Shore hardness of 74, and the waveguide tube (1) and the waveguide tube seat (9) are made of aluminum, copper or stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710367047.5A CN107069151B (en) | 2017-05-23 | 2017-05-23 | Waveguide rotary joint with adjustable gap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710367047.5A CN107069151B (en) | 2017-05-23 | 2017-05-23 | Waveguide rotary joint with adjustable gap |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107069151A CN107069151A (en) | 2017-08-18 |
| CN107069151B true CN107069151B (en) | 2022-02-25 |
Family
ID=59609739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710367047.5A Active CN107069151B (en) | 2017-05-23 | 2017-05-23 | Waveguide rotary joint with adjustable gap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107069151B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107715388A (en) * | 2017-11-01 | 2018-02-23 | 广东美的安川服务机器人有限公司 | Rotary joint and the rehabilitation training system with the rotary joint |
| CN115084804B (en) * | 2022-06-28 | 2023-04-28 | 电子科技大学 | GW-class circular TM 01 Mould vacuum rotary joint |
| CN115173019B (en) * | 2022-07-05 | 2024-05-17 | 成都西夏科技发展有限公司 | Waveguide processing apparatus |
| CN115241617B (en) * | 2022-08-05 | 2023-08-15 | 滁州市经纬装备科技有限公司 | L wave band rotary combined joint |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394323A (en) * | 2011-07-15 | 2012-03-28 | 中国工程物理研究院电子工程研究所 | Millimeter-wave wideband TE01-mode rotating joint |
| EP2797160A1 (en) * | 2013-04-23 | 2014-10-29 | Spinner GmbH | Rotary joint for millimeter wave scanning systems |
| CN207183475U (en) * | 2017-05-23 | 2018-04-03 | 星展测控科技股份有限公司 | A kind of waveguide junction of adjustable clearance |
-
2017
- 2017-05-23 CN CN201710367047.5A patent/CN107069151B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394323A (en) * | 2011-07-15 | 2012-03-28 | 中国工程物理研究院电子工程研究所 | Millimeter-wave wideband TE01-mode rotating joint |
| EP2797160A1 (en) * | 2013-04-23 | 2014-10-29 | Spinner GmbH | Rotary joint for millimeter wave scanning systems |
| CN207183475U (en) * | 2017-05-23 | 2018-04-03 | 星展测控科技股份有限公司 | A kind of waveguide junction of adjustable clearance |
Non-Patent Citations (1)
| Title |
|---|
| 某雷达馈线系统双波段五路方位关节的结构设计;平轶君等;《火控雷达技术》;20160325(第01期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107069151A (en) | 2017-08-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107069151B (en) | Waveguide rotary joint with adjustable gap | |
| CN107039715B (en) | Contact type gapless waveguide rotary joint | |
| CN107706486B (en) | Waveguide rotary joint capable of quickly adjusting clearance | |
| US8690603B2 (en) | Electrical connector with grounding member | |
| US11828637B2 (en) | Measuring assembly for the analysis of a flowing medium by means of microwaves | |
| US8827743B1 (en) | RF coaxial connectors | |
| US20130029520A1 (en) | High frequency coaxial cable | |
| JP2008148103A (en) | Microwave transmission apparatus | |
| US20170207528A1 (en) | Antenna system employing a rotatable circularly polarized antenna feed | |
| CN104916917A (en) | Wide-bandwidth wave beam mobile terminal satellite communication antenna | |
| CN207183475U (en) | A kind of waveguide junction of adjustable clearance | |
| CN110346657B (en) | Self-adaptive adjusting electrode fixture device | |
| CN104466306A (en) | Three-channel microwave rotary joint | |
| US8102326B2 (en) | Broadcast antenna ellipticity control apparatus and method | |
| US12119580B2 (en) | External device-to-external device connector for wireless communication devices | |
| US3011137A (en) | Rotary joint for microwave energy | |
| US20210332835A1 (en) | Connecting structure device between analysis electronics and probe in cylinder systems | |
| CN108535609B (en) | PCB antenna and external acoustic-electric composite sensor for GIS insulation defect detection | |
| CN207009611U (en) | Can quick regulation gap waveguide junction | |
| CN109687240A (en) | The big tolerance radio frequency connector of single type | |
| US3533046A (en) | Precision miniature sexless coaxial connector | |
| US10186741B2 (en) | Spring-loaded waveguide coupling for connecting a waveguide component to an external RF component | |
| WO2011079196A1 (en) | Test point adaptor for coaxial cable connections | |
| CN206962129U (en) | A kind of millimeter wave connector for connecing 0.047 inch of semi-flexible cable | |
| US7180218B2 (en) | Compression journal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 710077 Shaanxi city of Xi'an province high tech Zone No. 211 days Valley Ba Lu HUanpu science and Technology Industrial Park, building D2, No. 101 Applicant after: DBS measurement and control Polytron Technologies Inc Address before: 710077 Shaanxi city of Xi'an province high tech Zone No. 211 days Valley Ba Lu HUanpu science and Technology Industrial Park, building D2, No. 101 Applicant before: XI'AN SATPRO MEASUREMENT AND CONTROL TECHNOLOGY CO., LTD. |
|
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |