CN212810510U - Non-contact short circuit load - Google Patents
Non-contact short circuit load Download PDFInfo
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- CN212810510U CN212810510U CN202021837241.9U CN202021837241U CN212810510U CN 212810510 U CN212810510 U CN 212810510U CN 202021837241 U CN202021837241 U CN 202021837241U CN 212810510 U CN212810510 U CN 212810510U
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Abstract
The utility model discloses a non-contact short circuit load, which comprises an outer conductor, an inner conductor and a choke unit; the inner conductor is coaxially arranged in the outer conductor, a first gap is formed between the inner conductor and the outer conductor, a channel for cooling medium to circularly flow is formed in the inner conductor, and the choking unit is arranged in the first gap. The embodiment of the application designs the non-contact short circuit load, adopts the non-contact choking unit, has no hidden troubles of contact point abrasion, ignition and the like, and greatly improves the stability and the service life of the product. The cooling channel is arranged in the inner conductor, so that the heat dissipation of the short-circuit load can be accelerated, the power capacity of the short-circuit load is increased, and the short-circuit load cannot be damaged due to overhigh temperature under high power. And the inner ring and the outer ring of the choke unit are both provided with insulating sleeves, so that the power capacity of the short-circuit load is further improved. The utility model has the advantages of high temperature resistance, good stability and wide application range.
Description
Technical Field
The utility model relates to a microwave system measures technical field, especially relates to a non-contact short circuit load.
Background
The short circuit load is also called as short-circuit device, it is a device for realizing microwave system short circuit, its function is to reflect all electromagnetic wave energy back, short circuit the coaxial line and waveguide terminal, namely become coaxial line and waveguide fixed short-circuit device respectively.
In the measurement of a microwave system, an adjustable short-circuit load is needed, and the distance from the short-circuit load to a reference plane to be measured is adjusted to realize that the amplitude of the reflection coefficient is equal to 1 and the phase is changed between 0 and 360 degrees.
Short circuit load needs to ensure that the loss at the contact is small, and the modulus of the reflection coefficient of the short circuit load is close to 1; and the variation of the contact loss of the short-circuit load is small when the internal short-circuit breaker moves. In addition, when the high-power application is carried out, the phenomenon of sparking between the short-circuiting device and the waveguide (or the inner and outer conductor walls of the coaxial line) should not occur.
The existing short circuit load is a contact short circuit load, and the structure of the contact short circuit load is shown in fig. 1, and the contact short circuit load comprises an outer conductor, an inner conductor, a spring sheet b made of elastic materials (such as beryllium bronze, phosphor bronze and the like) and other components. The spring piece b is positioned in the outer conductor and is connected with one end of the inner conductor. The inner conductor drives the spring piece b to slide in the outer conductor, and the end part of the spring piece b forms a short circuit surface c when contacting with the inner wall a of the outer conductor.
In the process of implementing the technical solution of the embodiment of the present application, the inventor of the present application finds that the above prior art has at least the following technical problems:
1. the existing contact type short circuit load has the adverse effects that due to the fact that metal sliding contact exists, contact points of the spring piece and the cavity are disordered, the contact points are abraded after the spring piece is used for many times, and ignition is caused.
2. The existing contact type short circuit load can only be suitable for the working condition of low power (the power is less than 1MW), and is not suitable for the working condition of high power of 1 MW.
3. When the existing contact type short circuit load is used, a heating phenomenon exists, load parts can be damaged due to overhigh temperature, and the performance stability and the service life of a product are greatly influenced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application solves the technical problems that in the prior art, a contact type short circuit load is insufficient in power capacity, easy to wear and strike fire, and a load part is damaged due to overhigh temperature. By designing the non-contact short circuit load, the embodiment of the application has no hidden troubles such as contact point abrasion and ignition; the inner conductor is designed to be a hollow structure and serves as a channel for cooling media to flow circularly so as to cool, heat dissipation of the short-circuit load is accelerated, the short-circuit load cannot be damaged due to overhigh temperature under high power, power capacity, high temperature resistance and performance stability of the short-circuit load are improved, and service life of a product is prolonged.
In order to solve the above technical problem, an embodiment of the present application provides a non-contact short circuit load, including:
the outer conductor is hollow inside;
the inner conductor is coaxially arranged in the outer conductor, a first gap is formed between the inner conductor and the outer conductor, and a channel for cooling medium to circularly flow is arranged in the inner conductor;
a choke unit disposed in the first gap.
Furthermore, the channel extends and penetrates along the central axis direction of the inner conductor, and the inner conductor is in a hollow tubular shape.
Further, the choke unit is coaxially disposed in the first gap, and the choke unit includes:
the outer ring is a metal outer ring, one end of the outer ring is open, and the other end of the outer ring is bent inwards to form an end face;
the inner ring is a metal inner ring, the inner ring is positioned between the outer ring and the inner conductor, one end of the inner ring is open, and the other end of the inner ring is bent outwards and is connected with the end face of the other end of the outer ring; a second gap is formed between the main body of the inner ring and the main body of the outer ring;
the handle body is a non-metal handle body, the fixed end of the handle body is fixedly connected with the end face where the outer ring is connected with the inner ring, and the free end of the handle body extends along the first gap.
Furthermore, a threaded hole is formed in the end face, connected with the inner ring, of the outer ring, an inner thread is formed in the threaded hole, an outer thread is arranged on the fixed end of the handle body, the fixed end of the handle body is inserted into the threaded hole, and the handle body is fixedly connected with the outer ring and the inner ring through the matching of the inner thread and the outer thread.
Furthermore, the handle body is in a hollow rod shape, the handle body and the outer ring are coaxially arranged, and the inner conductor coaxially penetrates through the handle body.
Further, the handle body includes, but is not limited to, a PTFE handle body, an Ultem handle body, or a POM handle body.
Furthermore, the outer ring and the inner ring are coaxially arranged, and both the outer ring and the inner ring comprise a metal inner layer and a silver-plated surface layer.
Furthermore, a first insulating sleeve is arranged between the outer ring and the outer conductor, and the first insulating sleeve is fixedly sleeved on the outer ring.
Furthermore, a second insulating sleeve is arranged between the inner ring and the inner conductor, and the second insulating sleeve is fixedly sleeved on the inner conductor.
Furthermore, the first insulating sleeve is in a circular ring shape, and the first insulating sleeve is a PTFE insulating sleeve, an Ultem insulating sleeve or a POM insulating sleeve.
Still further, the second insulating sleeve is in a circular ring shape, and the second insulating sleeve is a PTFE insulating sleeve, an Ultem insulating sleeve or a POM insulating sleeve.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
(1) the application designs a non-contact short circuit load, because adopt the choking unit of non-contact, consequently do not have hidden danger such as contact point wearing and tearing, strike sparks, has greatly improved the stability and the life-span of product.
(2) The inner conductor is designed into a hollow structure which is a channel which can be communicated with a cooling system and is used for cooling medium to flow circularly, so that the heat dissipation of the short-circuit load can be accelerated, the power capacity of the short-circuit load is increased, and the short-circuit load part under high power cannot be damaged due to overhigh temperature.
(3) The inner ring and the outer ring of the choking unit are both a copper inner layer or an aluminum inner layer, the surface layer is plated with silver, the inner layer is a copper layer or an aluminum layer, the price is low, the price of metal silver is high, but the conductivity of the metal silver is high, the loss can be reduced, and the product has good cost performance. (4) The choke unit is characterized in that a first insulating sleeve and a second insulating sleeve are respectively arranged between an outer ring and an outer conductor and between an inner ring and an inner conductor, the first insulating sleeve can adjust a gap between the inner wall surfaces of the outer ring and the outer conductor, and the second insulating sleeve can adjust a gap between the inner ring and the outer wall surfaces of the inner conductor, so that the size of the gap between the two positions is proper, the choke unit can reflect all electromagnetic wave energy back, and the choke unit has a good short-circuit effect.
(5) The first insulating sleeve and the second insulating sleeve are both nonmetal insulating sleeves, such as PTFE insulating sleeves, Ultem insulating sleeves and POM insulating sleeves, and the breakdown voltage of the nonmetal insulating sleeves is far greater than that of air, so that the power capacity of the short-circuit load can be further increased by the arrangement of the first insulating sleeve and the second insulating sleeve.
(6) The short-circuit load in the embodiment of the application can bear high power of 1MW, so that the short-circuit load in the embodiment of the application has the characteristics of excellent performance and wide application range.
Drawings
Fig. 1 is a schematic structural diagram of a contact type short circuit piston in the prior art;
fig. 2 is a schematic structural diagram of a contactless short-circuit load according to a first embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a non-contact short-circuit load according to a second embodiment of the present application.
Description of reference numerals:
the conductor 1, the inner conductor 2, the choke unit 3, the outer ring 31, the inner ring 32, the handle body 33, the first insulating sleeve 34 and the second insulating sleeve 35.
Detailed Description
The embodiment of the application provides a non-contact short circuit load, and solves the technical problems that the contact short circuit load in the prior art is insufficient in power capacity, easy to wear and strike fire and damaged due to overhigh temperature
In order to solve the technical problem of the crosstalk, the technical scheme in the embodiment of the present application has the following general idea:
a non-contact short circuit load is designed, and due to the adoption of the non-contact choking unit, hidden dangers such as contact point abrasion, ignition and the like do not exist.
The inner conductor is designed into a hollow structure, and the hollow structure can be used as a channel which is communicated with a cooling system and is used for cooling medium to flow circularly so as to accelerate the heat dissipation of the short-circuit load, increase the power capacity of the short-circuit load and prevent the short-circuit load part under high power from being damaged due to overhigh temperature.
The non-metal insulating sleeve is arranged on the choking unit, and the breakdown voltage of the non-metal insulating sleeve is far greater than that of air, so that the power capacity of the short-circuit load can be further increased by arranging the non-metal insulating sleeve.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example one
Fig. 2 is a schematic structural diagram of a non-contact short-circuit load according to this embodiment, and as shown in fig. 2, the short-circuit load includes an outer conductor 1, an inner conductor 2, and a choke unit 3.
The outer conductor 1 is hollow inside; the inner conductor 2 is coaxially arranged in the outer conductor 1, and a first gap is formed between the inner conductor 2 and the outer conductor 1; a channel for cooling medium to flow circularly is arranged in the inner conductor 2 and is communicated with a cooling system to reduce the temperature; the choke unit 3 is disposed in the first gap.
Specifically, in this embodiment, the inner diameter of the outer conductor 1 is 230mm, the outer diameter of the inner conductor 2 is 100mm, the outer conductor and the inner conductor form a 50ohm coaxial transmission line, and the operating frequency is 166 MHz.
The choke unit 3 can totally reflect the electromagnetic wave energy back to short circuit the coaxial transmission line and the waveguide terminal, and can change the phase between 0 and 360 degrees by adjusting the distance from the short circuit load to the reference plane to be measured.
In addition, the cooling system can be used for producing cooling water. The cooling medium is water, a channel in the inner conductor 2 is communicated with a cooling system, and cooling water passes through the channel to cool the short-circuit load.
To sum up, this application is implemented through set up in the inner conductor can communicate with cooling system and supply the passageway of cooling medium circulation flow, in order to accelerate short circuit load's heat dissipation has increased short circuit load's power capacity, and make under high-power short circuit load can not damage because of the high temperature to the technical problem that the power capacity that chokes formula short circuit piston among the prior art exists is not enough has been solved, has realized improving the power capacity of chokes formula short circuit load and can high temperature resistant technological effect.
Further, the passage extends and penetrates along a central axis direction of the inner conductor 2, and specifically, the inner conductor 2 is a hollow circular tube.
Further, the choke unit 3 is coaxially disposed in the first gap, and the choke unit 3 includes an outer ring 31, an inner ring 32, and a shank 33.
The outer ring 31 is made of metal, one end of the outer ring 31 is open, and the other end is bent inwards to form an end face. The inner ring 32 is made of metal, the inner ring 32 is coaxially arranged between the outer ring 31 and the inner conductor 2, one end of the inner ring 32 is open, and the other end of the inner ring is bent outwards and is connected with the end face of the other end of the outer ring 31. And a second gap is formed between the main body part (excluding the end face with the other end bent) of the inner ring 32 and the main body part (excluding the end face with the other end bent) of the outer ring 31. The outer ring 31 and the inner ring 32 are of a U-shaped groove structure with one open end.
The handle 33 is made of non-metal material, the fixed end of the handle 33 is fixedly connected with the end surface where the outer ring 31 and the inner ring 32 are jointed, and the free end of the handle 33 extends along the first gap.
Specifically, the opening of the outer ring 31 and the opening of the inner ring 32 are flush, and the length of the outer ring 31 and the length of the inner ring 32 are both a quarter wavelength of the operating frequency (166 MHz). The free end of the handle body 33 is held, the handle body 33 drives the outer ring 31 and the inner ring 32 to axially move in the first gap between the inner conductor 2 and the outer conductor 1, and the distance from the short-circuit load to the reference plane to be measured can be adjusted, so that the amplitude of the reflection coefficient is equal to 1, and the phase is changed from 0 to 360 degrees.
Further, a threaded hole is formed in the center of the end face where the outer ring 31 and the inner ring 32 are connected, the threaded hole is provided with an internal thread, an external thread is arranged on the fixed end of the handle body 33, the fixed end of the handle body 33 is inserted into the threaded hole, and the handle body 33 is fixedly connected with the outer ring 31 and the inner ring 32 through the matching of the internal thread and the external thread.
Further, the outer ring 31 and the inner ring 32 are coaxially arranged, and both the outer ring 31 and the inner ring 32 comprise a metal inner layer and a silver surface layer. Specifically, the metal inner layer is a copper layer or an aluminum layer, the price is low, the price of the metal silver is high, the electric conductivity of the metal silver is high, the loss can be reduced, and the product has high cost performance.
Further, the stem 33 is in a hollow rod shape, the stem 33 is coaxially disposed with the outer ring 31 and the inner ring 32, the inner conductor 2 coaxially penetrates through the stem 33, the stem 33 includes, but is not limited to, a PTFE stem, an Ultem stem, or a POM stem, that is, the stem 33 is made of a non-metal material such as PTFE (polytetrafluoroethylene), Ultem (PEI, PEI is an abbreviation of polyetherimide), or POM (polyoxymethylene).
Specifically, the PTFE has excellent chemical stability, corrosion resistance, sealing property, high lubrication non-adhesiveness, electric insulation property and good ageing resistance, and the working temperature is up to 250 ℃.
The Ultem (namely PEI) has strong high-temperature stability, and even non-enhanced PEI still has good toughness and strength, so the PEI with excellent thermal stability can be used for manufacturing high-temperature heat-resistant devices.
The POM has good electrical insulation, is hardly influenced by temperature and humidity, has small change of dielectric constant and dielectric loss in wide temperature, humidity and frequency ranges, has excellent arc resistance, and can be maintained at high temperature.
The PTFE, Ultem, and POM described above are preferred insulating materials for the stem 33.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
(1) by designing the non-contact short circuit load, because the non-contact choking unit is adopted, hidden dangers such as contact point abrasion and ignition do not exist, and the stability and the service life of a product are greatly improved.
(2) The inner conductor is designed into a hollow structure which is a channel which can be communicated with a cooling system and is used for cooling medium to flow circularly, so that the heat dissipation of the short-circuit load can be accelerated, the power capacity of the short-circuit load is increased, and the short-circuit load part under high power cannot be damaged due to overhigh temperature.
(3) The inner ring and the outer ring of the choke unit are both a copper inner layer or an aluminum inner layer, the surface layer is plated with silver, the inner layer is a copper layer or an aluminum layer, the price is low, the price of metal silver is high, the conductivity of the metal silver is high, the loss can be reduced, and the product has high cost performance.
Example 2
Based on the same inventive concept as the contactless short-circuit load in the first embodiment, the present embodiment provides a contactless short-circuit load.
Fig. 3 is a schematic diagram of a non-contact short-circuit load according to the present embodiment, and as shown in fig. 3, the present embodiment is different from the first embodiment only in that: a first insulating sleeve 34 is arranged between the outer ring 31 and the outer conductor 1, and the first insulating sleeve 34 is fixedly sleeved on the outer ring 31; a second insulating sleeve 35 is arranged between the inner ring 32 and the inner conductor 2, and the second insulating sleeve 35 is fixedly sleeved on the inner conductor 2.
Specifically, the first insulating sleeve 34 can adjust a gap between the outer ring 31 and the inner wall surface of the outer conductor 1, and the second insulating sleeve 35 can adjust a gap between the inner ring 32 and the inner conductor 2, so as to ensure that the two gaps have proper sizes, thereby ensuring that the choke unit 3 can completely reflect electromagnetic wave energy, and ensuring that the short-circuit load has a good short-circuit effect.
Further, the first insulating sleeve is annular, and the first insulating sleeve 34 is a non-metal insulating sleeve, such as a PTFE insulating sleeve, an Ultem insulating sleeve, a POM insulating sleeve, or the like; the second insulating sleeve is annular, and the second insulating sleeve 35 is a non-metal insulating sleeve, such as a PTFE insulating sleeve, an Ultem insulating sleeve, a POM insulating sleeve, or the like. The non-metal insulating sleeve has better electrical insulation and higher breakdown voltage.
Since the first insulating sleeve 34 and the second insulating sleeve 35 are both non-metallic insulating sleeves, and the breakdown voltage of the first insulating sleeve 34 and the second insulating sleeve 35 made of non-metallic materials such as PTFE, Ultem, POM, etc. is much greater than that of air, the first insulating sleeve 34 is disposed between the outer ring 31 and the outer conductor 1, and the second insulating sleeve 35 is disposed between the inner ring 32 and the inner conductor 2, thereby further increasing the power capacity of the short-circuit load.
Effective experiments prove that the short-circuit load in the embodiment of the application can bear high power of 1MW, so that the short-circuit load in the embodiment of the application has the characteristics of excellent performance and wide application range.
In addition to the technical effects mentioned in the first embodiment, one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
(1) a first insulating sleeve 34 and a second insulating sleeve 35 are respectively arranged between the outer ring 31 and the outer conductor 1 and between the inner ring 32 and the inner conductor 2, the first insulating sleeve 34 can adjust a gap between the outer ring 31 and the inner wall surface of the outer conductor 1, and the second insulating sleeve 35 can adjust a gap between the inner ring 32 and the outer wall surface of the inner conductor 2, so that the sizes of the two gaps are proper, the choke unit 3 can be ensured to completely reflect electromagnetic wave energy, and the choke unit 3 has a good short-circuit effect.
(2) First insulating cover 34 and second insulating cover 35 are non-metal insulating cover, like PTFE insulating cover, Ultem insulating cover, POM insulating cover etc. and the breakdown voltage of non-metal insulating cover is far greater than the breakdown voltage of air, so, the setting of first insulating cover, second insulating cover can further increase short circuit load's power capacity, and the short circuit load that this application embodiment provided can bear the high-power up to 1 MW.
Other embodiments of the present embodiment are the same as the first embodiment, and various variations and specific examples of the contactless short-circuit load in the first embodiment are also applicable to the contactless short-circuit load in the present embodiment.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be termed a second element, and, similarly, a second element may be termed a first element, without departing from the scope of example embodiments.
The terms of orientation, outer, intermediate, inner, etc., as referred to or as may be referred to in the specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed according to the position and the use state of the structure. Therefore, these and other directional terms should not be construed as limiting terms.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. Those skilled in the art can make various changes, modifications and equivalent arrangements to those skilled in the art without departing from the spirit and scope of the present application; moreover, any equivalent alterations, modifications and variations of the above-described embodiments according to the spirit and techniques of this application are intended to be within the scope of the claims of this application.
Claims (10)
1. A contactless short circuit load, comprising:
the outer conductor is hollow inside;
the inner conductor is coaxially arranged in the outer conductor, a first gap is formed between the inner conductor and the outer conductor, and a channel for cooling medium to circularly flow is arranged in the inner conductor;
a choke unit disposed in the first gap.
2. A contactless short-circuit load according to claim 1, wherein said passage extends through and along a central axis of said inner conductor, and said inner conductor has a hollow tubular shape.
3. A contactless short-circuit load according to claim 1, wherein said choke unit is coaxially disposed in said first gap, and said choke unit includes:
the outer ring is a metal outer ring, one end of the outer ring is open, and the other end of the outer ring is bent inwards to form an end face;
the inner ring is a metal inner ring, the inner ring is positioned between the outer ring and the inner conductor, one end of the inner ring is open, and the other end of the inner ring is bent outwards and is connected with the end face of the other end of the outer ring; a second gap is formed between the main body of the inner ring and the main body of the outer ring;
the handle body is a non-metal handle body, the fixed end of the handle body is fixedly connected with the end face where the outer ring is connected with the inner ring, and the free end of the handle body extends along the first gap.
4. The non-contact short circuit load according to claim 3, wherein a threaded hole is formed in an end surface where the outer ring and the inner ring are connected, the threaded hole has an internal thread, an external thread is formed on a fixed end of the handle body, the fixed end of the handle body is inserted into the threaded hole, and the handle body is fixedly connected with the outer ring and the inner ring through the matching of the internal thread and the external thread.
5. A contactless short-circuit load according to claim 3, wherein said shank is in the form of a hollow rod, said shank being disposed coaxially with said outer ring, said inner conductor extending coaxially through said shank.
6. A contactless short circuit load according to claim 3 or 5, said shank including but not limited to PTFE shank, Ultem shank or POM shank.
7. A contactless short-circuit load according to claim 3, wherein said outer ring and said inner ring are coaxially arranged, and both of said outer ring and said inner ring comprise a metallic inner layer and a silver-plated surface layer.
8. A contactless short-circuit load according to claim 3, wherein a first insulating sleeve is provided between said outer ring and said outer conductor, and said first insulating sleeve is fixedly fitted over said outer ring.
9. The contactless short-circuit load according to claim 8, wherein a second insulating sleeve is disposed between the inner ring and the inner conductor, and the second insulating sleeve is fixedly fitted over the inner conductor.
10. The contactless short-circuit load according to claim 9, wherein said first insulating sleeve is annular, and said first insulating sleeve is a PTFE insulating sleeve, an Ultem insulating sleeve or a POM insulating sleeve;
the second insulating sleeve is in a circular ring shape, and is a PTFE insulating sleeve, an Ultem insulating sleeve or a POM insulating sleeve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021837241.9U CN212810510U (en) | 2020-08-28 | 2020-08-28 | Non-contact short circuit load |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021837241.9U CN212810510U (en) | 2020-08-28 | 2020-08-28 | Non-contact short circuit load |
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| CN212810510U true CN212810510U (en) | 2021-03-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115411478A (en) * | 2021-05-26 | 2022-11-29 | 散裂中子源科学中心 | Sliding short circuiter |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115411478A (en) * | 2021-05-26 | 2022-11-29 | 散裂中子源科学中心 | Sliding short circuiter |
| CN115411478B (en) * | 2021-05-26 | 2023-12-01 | 散裂中子源科学中心 | Sliding short-circuiting device |
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