Combined adjusting screw with temperature deviation compensation effect
By setting a dielectric material rod at the end of the screw body, and utilizing the characteristic that the dielectric constant of the dielectric material changes with temperature, the problem of temperature deviation in metal screw adjustment is solved, achieving temperature deviation compensation and reducing product cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-26
- Publication Date
- 2026-04-14
AI Technical Summary
Existing metal screws exhibit frequency deviation (temperature deviation) when the temperature changes. While using Invar steel with a low coefficient of thermal expansion can compensate for this temperature deviation, it is expensive and has a high density, which is not conducive to reducing product cost and weight.
A countersunk hole is provided at the end of the screw body, and a dielectric material rod, such as alumina ceramic, Sr4Fe6O13 ferrite or highly doped silicon dioxide glass, is inserted. The dielectric constant decreases with increasing temperature, and the resonant frequency increases, thus achieving temperature deviation compensation.
By changing the dielectric properties of the dielectric material rod, the temperature deviation of the metal cavity can be reduced, avoiding the use of high-cost Invar steel materials, thus achieving temperature deviation compensation and reducing product costs.
Smart Images
Figure CN224123499U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of screw technology, specifically a combined adjusting screw with temperature deviation compensation effect. Background Technology
[0002] In the fields of communication and electronic equipment, the tuning screw is an important adjustment component, widely used in devices such as filters and resonators to achieve precise adjustment of device performance parameters.
[0003] However, existing metal materials have the characteristic of thermal expansion and contraction, which causes the frequency of the metal resonant cavity to shift when the temperature changes (referred to as temperature deviation). Temperature deviation is related to the metal's coefficient of thermal expansion (metal expansion: the higher the temperature, the larger the volume, and the lower the resonant frequency). The common way to solve temperature deviation is to use Invar steel, a material with a low coefficient of thermal expansion. However, Invar steel is expensive and has a high density, which is not conducive to reducing product costs and weight, and makes it difficult to meet the user's needs. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a combined tuning screw with temperature deviation compensation. This solves the problem that, due to the inherent thermal expansion and contraction characteristics of metal materials, the frequency of the metal resonant cavity shifts with temperature changes (referred to as temperature deviation). Temperature deviation is related to the metal's coefficient of thermal expansion (metal expansion: the higher the temperature, the larger the volume, and the lower the resonant frequency). The common method to solve temperature deviation is to use Invar steel, a material with a low coefficient of thermal expansion. However, Invar steel is expensive and has a high density, which is not conducive to cost reduction and weight reduction of products, and it is difficult to meet the user's needs.
[0005] This utility model provides the following technical solution: a combined adjusting screw with temperature deviation compensation effect, including a screw body, a screw rotating part is provided at the end of the screw body, a rotating slot is provided on the surface of the screw rotating part, a countersunk hole is provided at the end of the screw body, a medium material rod is inserted into the countersunk hole, and a nut is sleeved on the screw body.
[0006] Preferred technical solution 1: The rotating slot is in the shape of a cross groove.
[0007] This solution makes it easier for users to rotate the screw body.
[0008] Preferred technical solution 2: The inner diameter of the countersunk hole is equal to the diameter of the medium material rod.
[0009] This solution enables the medium material rod to be stably inserted into the countersunk hole and thus be positioned within the limit.
[0010] Preferred technical solution 3: The nut is a nut with equal hexagonal sides.
[0011] Compared with the prior art, this utility model provides a combined adjusting screw with temperature deviation compensation effect, which has the following beneficial effects:
[0012] (1) This utility model provides a countersunk hole at the end of the screw body and a dielectric material rod in the countersunk hole. The dielectric constant of the dielectric material rod can decrease as the temperature rises. The smaller the dielectric constant, the higher the resonant frequency, which can effectively reduce the temperature deviation of the metal cavity. Therefore, it is no longer necessary to use materials such as Invar steel, and the temperature deviation compensation effect can be achieved, making it more convenient for users to use. Attached Figure Description
[0013] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;
[0014] Figure 2 This is a side view of the structure of this utility model;
[0015] Figure 3 This is an exploded view of the structure of this utility model;
[0016] Figure 4 For the present utility model Figure 3 A schematic diagram of the structure of the nut.
[0017] In the diagram: 1. Screw body; 2. Screw rotating part; 3. Rotating slot; 4. Countersunk hole; 5. Medium material rod; 6. Nut. Detailed Implementation
[0018] Please see Figure 1-4 ,
[0019] Example 1: A combined adjusting screw with temperature deviation compensation effect includes a screw body 1, a screw rotating part 2 is provided at the end of the screw body 1, a rotating slot 3 is provided on the surface of the screw rotating part 2, a countersunk hole 4 is provided at the end of the screw body 1, a medium material rod 5 is inserted into the countersunk hole 4, and a nut 6 is fitted on the screw body 1.
[0020] Example 2: The difference between this example and Example 1 is that the rotating slot 3 is in the shape of a cross groove.
[0021] This makes it more convenient for users to rotate the screw body 1.
[0022] Example 3: The difference between this example and Example 1 is that the inner diameter of the countersunk hole 4 is equal to the diameter of the dielectric material rod 5.
[0023] This ensures that the dielectric material rod 5 is stably inserted into the countersunk hole 4 and is thus limited.
[0024] Example 4: The difference between this example and Example 1 is that the nut 6 is a nut with equal hexagonal sides.
[0025] In this embodiment, due to the inherent thermal expansion and contraction characteristics of existing metal materials, the frequency of the metal resonant cavity will shift when the temperature changes, which is called temperature deviation. Temperature deviation is related to the metal expansion coefficient. As the temperature increases, the volume increases and the resonant frequency decreases. The common method to solve temperature deviation is to use Invar steel with a low expansion coefficient. However, Invar steel is expensive and has a high density, which is not conducive to reducing product cost and weight and makes it difficult to meet the user's needs.
[0026] In summary, in specific implementation, a countersunk hole 4 is provided at the end of the screw body 1, and a dielectric material rod 5 is inserted into the countersunk hole 4. The dielectric material rod 5 is a dielectric material, usually existing alumina ceramic. The dielectric constant of alumina ceramic decreases with increasing temperature. At the same time, under the condition of a fixed filter size, the smaller the dielectric constant of the microwave dielectric, the higher the corresponding resonant frequency. Therefore, alumina ceramic meets the characteristic of a smaller dielectric constant and a higher resonant frequency.
[0027] For certain ferrite materials, such as Sr4Fe6O13 ferrite, the dielectric constant generally decreases at high temperatures, meaning it decreases with increasing temperature. Furthermore, this decrease in dielectric constant leads to an increase in the resonant frequency, thus satisfying the performance requirement of a higher resonant frequency for a smaller dielectric constant.
[0028] Highly doped silica glass: At high temperatures, electronic polarization becomes the main contributor to the high doping of silica glass, and the dielectric constant decreases with increasing temperature. According to the characteristics of microwave media, the decrease in dielectric constant will lead to a higher resonant frequency.
[0029] Organic-inorganic hybrid system: At high temperature, the thermal activation process of organic-inorganic hybrid system is enhanced, the interfacial polarization and dipole polarization are weakened, and the dielectric constant decreases with increasing temperature. When the dielectric constant decreases, its resonant frequency will be correspondingly higher. Moreover, the dielectric constant of the dielectric material rod 5 can decrease with increasing temperature. The smaller the dielectric constant, the higher the resonant frequency, which can effectively reduce the temperature deviation of the metal cavity.
Claims
1. A combined adjusting screw with temperature deviation compensation effect, characterized in that: The screw body (1) includes a screw rotating part (2) at the end of the screw body (1), a rotating slot (3) is provided on the surface of the screw rotating part (2), a countersunk hole (4) is provided at the end of the screw body (1), a medium material rod (5) is inserted into the countersunk hole (4), and a nut (6) is fitted on the screw body (1).
2. The combined adjusting screw with temperature deviation compensation effect according to claim 1, characterized in that: The rotating slot (3) is in the shape of a cross groove.
3. The combined adjusting screw with temperature deviation compensation effect according to claim 2, characterized in that: The inner diameter of the countersunk hole (4) is equal to the diameter of the medium material rod (5).
4. The combined adjusting screw with temperature deviation compensation effect according to claim 3, characterized in that: The nut (6) is a nut with equal hexagonal sides.