CN201486990U - Screw device and a cavity filter utilizing same - Google Patents
Screw device and a cavity filter utilizing same Download PDFInfo
- Publication number
- CN201486990U CN201486990U CN 200920158672 CN200920158672U CN201486990U CN 201486990 U CN201486990 U CN 201486990U CN 200920158672 CN200920158672 CN 200920158672 CN 200920158672 U CN200920158672 U CN 200920158672U CN 201486990 U CN201486990 U CN 201486990U
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- screw
- screw device
- helical thread
- thread portion
- cavity
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Abstract
A screw device comprises a screw stem and a rigid conductor rod fixedly connected with the screw stem. The screw stem at least comprises a portion without thread and a first threaded portion with thread, cross section expansion of the portion without thread perpendicular to an axial line of the screw stem extending direction is smaller than cross section expansion of thread large diameter of the first threaded portion and larger than cross section expansion of thread small diameter of the first threaded portion, and the portion without thread is provided with a groove along the axial line of the screw stem extending direction. The screw device can realize self locking without a nut, compared with a traditional screw utilizing a nut to lock, the screw device greatly reduces cost. In addition, the utility model further provides a cavity filter utilizing the screw device.
Description
Technical field
The utility model relates to communication technical field, relates in particular to screw device and uses the cavity body filter of this screw device.
Background technique
Wave filter is widely used in the communications field as a kind of frequency selection device, especially field of radio frequency communication.Finish in the base station that signal transmits and receives in communications system, wave filter is used to select signal of communication, clutter or undesired signal that the filtering communication signal frequency is outer.
At present, in mobile communication base station system, the signal that generally uses cavity body filter to come antenna is transmitted and received carries out the frequency selection.Cavity body filter comprises cavity and cover plate, and this cavity is provided with a plurality of cavitys.The bottom that forms each cavity on this cavity is provided with resonatron.This resonatron inside is hollow shape, forms resonant cavity.On the cover board corresponding with the resonant cavity of this resonatron position offers screw, and a tuning screw cooperates with this screw, and gos deep in this cavity.By adjusting the distance of this tuning screw and this resonatron, reach the purpose of adjusting resonant frequency.
After adjusting resonant frequency, loosening in order to prevent above-mentioned tuning screw, need set up a set screw nut in the part that this tuning screw is positioned at outside the cavity usually.Yet, in the real world of resource worsening shortages nowadays, must not become irrespective problem in order to pursue higher economic and social benefit, to save production cost.And each tuning screw of above-mentioned cavity body filter all needs additionally to set up a set screw nut, needs tuning cavity body filter for having a plurality of resonatrons, needs a large amount of set screw nuts, therefore, has greatly increased the cost of production of cavity body filter.
The model utility content
In view of this, the utility model provides a kind of have auto-lock function and screw device with low cost.In addition, also be necessary to provide a kind of cavity body filter that uses above-mentioned screw device.
A kind of screw device, the conductor rods that comprises screw rod and the rigidity of fixedlying connected with this screw rod, this screw rod comprises unthreaded portion at least and has first helical thread portion of screw thread, described unthreaded portion is perpendicular to the cross-sectional expansion of the screw axis bearing of trend cross-sectional expansion less than the Major Diam place of described first helical thread portion, and the expansion greater than the cross section, screw thread path place of described first helical thread portion is provided with along the groove of screw axis bearing of trend on described unthreaded portion.
In the above-mentioned screw device, the opposing end of described conductor rods and described screw rod is provided with receiving channel or receiving station.
In the above-mentioned screw device, described screw device also comprises second helical thread portion, and described unthreaded portion is between described first helical thread portion and second helical thread portion.
In the above-mentioned screw device, the thread pitch of described first helical thread portion and second helical thread portion equates.
In the above-mentioned screw device, described screw rod is made by plastic material, and described conductor rods is made of metal.
In the above-mentioned screw device, be provided with receiving channel or receiving station with the opposing end of described conductor rods on the described screw rod.
In the above-mentioned screw device, described unthreaded portion is the multiple of the described first helical thread portion pitch along the length of the axis bearing of trend of described screw rod.
A kind of cavity body filter comprises cavity, and this cavity is provided with the screw that cooperates with above-mentioned screw device, and described screw device adjustable ground is assemblied in the described screw.
After above-mentioned screw device is screwed into cavity, because the described cross-sectional expansion of described unthreaded portion is greater than the cross-sectional expansion at the screw thread path place of described first helical thread portion or second helical thread portion, described unthreaded portion is extruded, its groove is distortion therefore, producing one makes described unthreaded portion recover the active force that it is not extruded preceding shape, this active force pushes described cavity, and described screw device is locked on the described cavity, and then realizes the self-locking of described screw device.Described screw device does not need nut can realize self-locking, adopts nut to come lock screw with respect to tradition, and its cost reduces greatly.
Description of drawings
Fig. 1 is the schematic representation of the screw device of a better embodiment.
Fig. 2 is the partial sectional view of screw device shown in Figure 1.
Fig. 3 is the schematic representation of the cavity body filter of use screw device shown in Figure 1.
Embodiment
Present embodiment provides a kind of screw device, and this screw device comprises the conductor rods of screw rod and the rigidity of fixedlying connected with this screw rod.This screw rod comprises a part with screw thread at least and has the unthreaded portion that helical thread portion links to each other with this, this unthreaded portion is perpendicular to the cross-sectional expansion of the screw axis cross-sectional expansion less than the Major Diam place of described helical thread portion, and the expansion greater than the cross section, screw thread path place of described helical thread portion is provided with along the groove of screw axis bearing of trend on described unthreaded portion.In addition, present embodiment also provides a kind of cavity body filter that uses above-mentioned screw device, this cavity body filter comprises cavity, on described cavity, be provided with a cavity at least, cavity bottom at the described cavity of described formation is provided with screw, described screw device cooperates with described screw rotationally, and described unthreaded portion is squeezed in described screw and has the power of expanding to screw, makes described screw device from locking in the described screw.
In order to describe the screw device that the utility model provides in detail, please consult Fig. 1 to Fig. 3 simultaneously.Described screw device 100 comprises the conductor rods 110 and the screw rod 120 of rigidity.
One end of the conductor rods 110 of described rigidity is provided with first receiving channel 1101, the other end and screw rod 120 secure bond.This conductor rods 110 is a metallic rod in the present embodiment, and described metal is a copper.Described screw rod 120 is made by the material with telescopicing performance, and in the present embodiment, described screw rod is made by rigidity plastics, and this screw rod 120 is by injection moulding mode and described conductor rods 110 secure bond.
Described screw rod 120 comprises first helical thread portion 121, unthreaded portion 123, second helical thread portion 125.Described second helical thread portion 125 is fixedlyed connected with an end of described conductor rods 110.Described unthreaded portion 123 is arranged on the screw rod 120, between first helical thread portion 121 and second helical thread portion 125.Pitch between the screw thread on described first helical thread portion 121 and second helical thread portion 125 is identical.The direction of extending along described screw rod 120 axis in the described unthreaded portion 123 is provided with groove 1231, described no rib-loop part 123 is along the cross-sectional expansion of the cross-sectional expansion on the direction of extending perpendicular to screw rod 120 axis less than the Major Diam place of described first helical thread portion 121 or second helical thread portion 125, and greater than the cross-sectional expansion at the screw thread path place of described first helical thread portion 121 or second helical thread portion 125.Described unthreaded portion 123 is the multiple of thread pitch on described first helical thread portion 121 or second helical thread portion 125 along the length of described screw rod 120 axis bearing of trends.
An end relative with described conductor rods 110 on the described screw rod 120 is provided with second receiving channel 1211.In the present embodiment, the end that is provided with this second receiving channel 1211 just is described first helical thread portion 121, in other embodiments, on the unthreaded portion that the end that this second receiving channel 1211 can be arranged at described screw rod 120 adds, this unthreaded portion is less than or equal to the cross-sectional expansion at the screw thread path place of described first helical thread portion 121 along the cross-sectional expansion of described screw rod 120 axis bearing of trends.Described first receiving channel 1101 and second receiving channel 1211 can substitute with receiving station in other embodiments.Described first receiving channel 1101 is used for described screw device 100 is screwed into cavity, and described second receiving channel 1211 is used for after the cover plate of cavity body filter covers described screw device 100 being adjusted, thereby adjust the electric capacity of described cavity body filter, realize adjusting the purpose of resonant frequency.
After described screw device 100 is screwed into cavity, because the described cross-sectional expansion of described unthreaded portion 123 is greater than the cross-sectional expansion at the screw thread path place of described first helical thread portion 121 or second helical thread portion 125, described unthreaded portion 123 is extruded, its therefore distortion of groove 1231, producing one makes described unthreaded portion 123 recover the active force that it is not extruded preceding shape, this active force pushes described cavity, described screw device 100 is locked on the described cavity, and then realizes the self-locking of described screw device 100.
Described screw device 100 can be realized self-locking, and the realization of described auto-lock function do not need additionally to set up nut, therefore, makes and makes described cost with screw device of auto-lock function and significantly reduce.In addition, because described screw device 100 combines with described cavity body filter, it does not need nut from locking on described cavity body filter, and described screw device can be contained in the cavity of described cavity body filter fully, do not need additionally to increase the size of described cavity body filter, help the miniaturization of described cavity body filter and integrated.
As shown in Figure 4, it is the schematic representation of the cavity body filter of use screw device 100 shown in Figure 1.Described cavity body filter 200 comprises cavity 210, resonance post 220, cover plate 230, screw device 100.Described cavity 210 is provided with cavity 211, described resonance post 220 is contained in the described cavity 211, and an end of described resonance post 220 and described cavity 210 is fixing, and its other end has flange plate 221, described resonance post 220 inside are hollow shape, form containing space 223.Be provided with screw 213 with described resonance post 220 places of combining on the described cavity 210, this screw 213 communicates with the containing space 223 of described resonance post 220.The containing space 223 that described screw device 100 passes described resonance post 220 matches with described screw 213.Described cover plate 230 is covered on the described cavity 210.After described cover plate 230 covers, adjust the position of described screw device 100 in described cavity 210 by second receiving channel 1211 of screw device 100, and then realize adjusting the purpose of resonant frequency.
The detailed description of the cavity body filter 200 of above-mentioned screw device 100 and this screw device 100 of use, be for helping to understand the technological scheme of the utility model, the technician of related domain should be appreciated that the content of this specification should not be construed as restriction of the present utility model.
Claims (8)
1. screw device, it is characterized in that: this screw device comprises the conductor rods of screw rod and the rigidity of fixedlying connected with this screw rod, this screw rod comprises unthreaded portion at least and has first helical thread portion of screw thread, described unthreaded portion is perpendicular to the cross-sectional expansion of the screw axis bearing of trend cross-sectional expansion less than the Major Diam place of described first helical thread portion, and the expansion greater than the cross section, screw thread path place of described first helical thread portion is provided with along the groove of screw axis bearing of trend on described unthreaded portion.
2. screw device as claimed in claim 1 is characterized in that: the opposing end of described conductor rods and described screw rod is provided with receiving channel or receiving station.
3. screw device as claimed in claim 1 is characterized in that: described screw device also comprises second helical thread portion, and described unthreaded portion is between described first helical thread portion and second helical thread portion.
4. screw device as claimed in claim 3 is characterized in that: the thread pitch of described first helical thread portion and second helical thread portion equates.
5. screw device as claimed in claim 1 is characterized in that: described screw rod is made by plastic material, and described conductor rods is made of metal.
6. screw device as claimed in claim 1 is characterized in that: be provided with receiving channel or receiving station with the opposing end of described conductor rods on the described screw rod.
7. screw device as claimed in claim 1 is characterized in that: described unthreaded portion is the multiple of the described first helical thread portion pitch along the length of the axis bearing of trend of described screw rod.
8. cavity body filter, it is characterized in that: described cavity body filter comprises cavity, and this cavity is provided with the screw that cooperates with any one described screw device of described claim 1 to 7, and described screw device adjustable ground is assemblied in the described screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920158672 CN201486990U (en) | 2009-06-10 | 2009-06-10 | Screw device and a cavity filter utilizing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920158672 CN201486990U (en) | 2009-06-10 | 2009-06-10 | Screw device and a cavity filter utilizing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201486990U true CN201486990U (en) | 2010-05-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920158672 Expired - Lifetime CN201486990U (en) | 2009-06-10 | 2009-06-10 | Screw device and a cavity filter utilizing same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201486990U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377419A (en) * | 2013-08-14 | 2015-02-25 | 台扬科技股份有限公司 | Microwave resonant cavity |
-
2009
- 2009-06-10 CN CN 200920158672 patent/CN201486990U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377419A (en) * | 2013-08-14 | 2015-02-25 | 台扬科技股份有限公司 | Microwave resonant cavity |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100526 Effective date of abandoning: 20090610 |