A high-precision adjustable isothermal crystal oscillator temperature control device

Abstract

This utility model discloses a high-precision adjustable isothermal crystal oscillator temperature control device, which includes a shell, an outer isothermal bath, and an inner isothermal bath. A heating film is fixedly connected to the inner surface of the inner isothermal bath, and an installation cavity is fixedly connected inside the inner isothermal bath, in which a crystal oscillator is placed. A high-precision main temperature sensor is fixedly connected to the right side of the installation cavity, and auxiliary temperature sensors are fixedly connected to the inner walls of the inner side of the inner isothermal bath. Through the integrated design of the heating film covering the entire inner surface of the inner isothermal bath and the installation cavity, combined with the high-precision main temperature sensor directly monitoring the crystal oscillator and the auxiliary temperature sensors, high-precision temperature control of the crystal is achieved. The uniform heat radiation of the heating film eliminates the local hot spots caused by traditional point heating, and the auxiliary sensors provide real-time feedback on the temperature difference of the bath wall and drive the heating film to control the overall temperature difference of the inner bath within a reasonable range.

Description

Technical Field

[0001] This utility model relates to the technical field of thermostatic crystal oscillator temperature control devices, and in particular to a high-precision adjustable thermostatic crystal oscillator temperature control device. Background Technology

[0002] High-precision isothermal crystal oscillator temperature control devices are core time and frequency foundational equipment supporting cutting-edge fields such as 5G communication, satellite navigation, and quantum computing. Their necessity stems from the strong correlation between the frequency stability of the crystal oscillator and temperature. However, in existing technologies, the single-layer isothermal bath structure is difficult to break through the performance limits required for quantum precision measurement due to the temperature sensor being far from the crystal, the local hot spots caused by resistance wire heating, and the thermal bridge effect of the pin leads.

[0003] A search revealed Chinese Patent Publication No. CN203896310U, which discloses a temperature control structure for a single-slot isothermal crystal oscillator. The structure includes a first PCB board with a crystal oscillation circuit, an isothermal bath housing both the first PCB board and the crystal oscillation circuit, a second PCB board for mounting the isothermal bath, and a temperature control circuit containing two temperature sensors RT1 and RT2 and a power transistor. Temperature sensor RT1 is located inside and thermally connected to the isothermal bath, the power transistor is located on the outer wall of the isothermal bath, and temperature sensor RT2 and other remaining components of the temperature control circuit are mounted on the second PCB board, with temperature sensor RT2 located outside the isothermal bath. This invention uses temperature sensor RT1 to sense the internal temperature of the thermostatic bath and RT2 to sense the ambient temperature change outside the thermostatic bath. By utilizing the temperature gradient between the two temperature sensors, the thermostatic oscillator circuit can be precisely controlled to maintain a constant temperature. This allows the temperature control accuracy of the thermostatic bath to reach a few thousandths of a degree, effectively improving the temperature stability of the thermostatic crystal oscillator. This patent has the advantage of achieving precise temperature control through the temperature gradient between the two temperature sensors inside and outside the thermostatic bath, effectively improving the temperature stability of the thermostatic crystal oscillator. However, it still has the problem of insufficient ability to suppress ambient temperature fluctuations due to the lack of a multi-layer thermal isolation barrier. Utility Model Content

[0004] The purpose of this invention is to provide a high-precision adjustable isothermal crystal oscillator temperature control device to solve the problem of insufficient ability to suppress ambient temperature fluctuations due to the lack of multi-layer thermal isolation barriers.

[0005] To achieve the above objectives, a high-precision adjustable isothermal crystal oscillator temperature control device is provided, comprising a shell, an outer isothermal bath, and an inner isothermal bath. A heating film is fixedly connected to the inner surface of the inner isothermal bath, and an installation cavity is fixedly connected inside the inner isothermal bath, in which a crystal oscillator is placed.

[0006] A high-precision main temperature sensor is fixedly connected to the right side of the mounting cavity, and auxiliary temperature sensors are fixedly connected to the inner wall of the inner constant temperature bath.

[0007] According to the high-precision adjustable constant temperature crystal oscillator temperature control device, four low thermal conductivity outer layer support columns are fixedly connected inside the outer shell, an outer constant temperature tank is fixedly connected on the low thermal conductivity outer layer support columns, and a pin array is fixedly connected on the inner wall of the outer shell.

[0008] According to the high-precision adjustable constant temperature crystal oscillator temperature control device, an outer layer gap is provided between the outer shell and the outer constant temperature bath, the outer layer gap is filled with inert gas, and an ambient temperature sensor is fixedly connected to the center of the top of the inner wall of the outer shell.

[0009] According to the high-precision adjustable constant temperature crystal oscillator temperature control device, an inert gas valve is provided at the right end of the outer shell, and an outer auxiliary heater is fixedly connected to the outer wall of the outer constant temperature tank.

[0010] According to the high-precision adjustable constant temperature crystal oscillator temperature control device, four ultra-low thermal conductivity inner layer support columns are fixedly connected to the bottom of the inner wall of the outer constant temperature tank, and the inner constant temperature tank is fixedly connected to the ultra-low thermal conductivity inner layer support columns.

[0011] According to the high-precision adjustable constant temperature crystal oscillator temperature control device, the outer constant temperature tank and the inner constant temperature tank are provided with an inner layer gap, and the inner layer gap is filled with heat insulation material.

[0012] According to the high-precision adjustable isothermal crystal oscillator temperature control device, the lower part of the crystal oscillator is provided with electrode pins, and the electrode pins are fixedly connected with low thermal conductivity leads. The low thermal conductivity leads pass through the inner layer isothermal tank and the outer layer isothermal tank and are fixedly connected to the pin array.

[0013] According to the high-precision adjustable constant temperature crystal oscillator temperature control device, the low thermal conductivity lead wire is provided with a hole at the connection between the inner constant temperature tank and the outer constant temperature tank, and the hole is filled with low thermal conductivity sealant.

[0014] The above-mentioned solution has the following beneficial effects:

[0015] 1. This patent achieves high-precision temperature control of the crystal by integrating a heating film that fully covers the inner surface of the inner constant temperature bath with the mounting cavity, combined with a high-precision main temperature sensor to directly monitor the crystal oscillator and an auxiliary temperature sensor. The uniform heat radiation of the heating film eliminates local hot spots caused by traditional point heating. The auxiliary sensor provides real-time feedback on the temperature difference of the bath wall and drives the heating film to control the overall temperature difference of the inner bath within a reasonable range.

[0016] 2. This patent constructs a dual-level thermal barrier by filling the outer layer with inert gas and the inner layer with thermal insulation material, minimizing the attenuation of ambient temperature fluctuations; the low thermal conductivity lead grooves covered with titanium alloy, combined with sealant to seal the holes, ultimately improve the stability of the crystal oscillator output frequency to the standard level.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0019] Figure 1 This is a cross-sectional view of the outer casing of a high-precision adjustable constant-temperature crystal oscillator temperature control device according to this utility model;

[0020] Figure 2 This is a cross-sectional view of the outer thermostatic bath of a high-precision adjustable thermostatic crystal oscillator temperature control device according to this utility model.

[0021] Figure 3 This is a cross-sectional view of the inner constant temperature bath of a high-precision adjustable constant temperature crystal oscillator temperature control device according to this utility model.

[0022] Figure 4 This is a schematic diagram of a high-precision adjustable constant temperature crystal oscillator temperature control device according to the present invention.

[0023] Legend:

[0024] 1. Outer shell; 2. Outer layer void; 3. Hole; 4. Low thermal conductivity lead wire; 5. Pin array; 6. Ambient temperature sensor; 7. Low thermal conductivity outer layer support pillar; 8. Inert gas valve; 9. Outer layer thermostatic bath; 10. Outer layer auxiliary heater; 11. Inner layer void; 12. Ultra-low thermal conductivity inner layer support pillar; 13. Inner layer thermostatic bath; 14. Heating film; 15. Auxiliary temperature sensor; 16. Electrode pin; 17. Crystal oscillator; 18. Mounting cavity; 19. High-precision main temperature sensor. Detailed Implementation

[0025] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0026] Reference Figure 1-4 This utility model embodiment provides a high-precision adjustable constant temperature crystal oscillator temperature control device, which includes...

[0027] The system comprises an outer shell 1, an outer constant temperature bath 9, and an inner constant temperature bath 13. A heating film 14 is fixedly connected to the inner surface of the inner constant temperature bath 13. An installation cavity 18 is fixedly connected inside the inner constant temperature bath 13. A crystal oscillator 17 is placed inside the installation cavity 18. The heating film 14 achieves uniform heating through planar thermal radiation, eliminating local hot spots. The installation cavity 18 positions the crystal oscillator 17 at the geometric center of the thermal field.

[0028] A high-precision main temperature sensor 19 is fixedly connected to the right side of the mounting cavity 18, and auxiliary temperature sensors 15 are fixedly connected to the inner walls of the inner constant temperature bath 13. The high-precision main temperature sensor 19 provides real-time feedback on temperature changes; the auxiliary temperature sensors 15 construct a three-dimensional thermal field model on the four walls of the inner bath, dynamically calibrate errors, and work together.

[0029] Four low thermal conductivity outer support pillars 7 are fixedly connected inside the outer casing 1. An outer constant temperature bath 9 is fixedly connected to the low thermal conductivity outer support pillars 7. A pin array 5 is fixedly connected to the inner wall of the outer casing 1. The four low thermal conductivity outer support pillars 7 suspend the outer constant temperature bath 9 inside the outer casing 1, blocking the solid heat conduction path from the outer casing to the bath. The pin array 5 is integrated into the inner wall of the outer casing to provide a standardized electrical interface for the low thermal conductivity leads 4.

[0030] An outer layer gap 2 is provided between the outer shell 1 and the outer layer constant temperature bath 9. The outer layer gap 2 is filled with inert gas. An ambient temperature sensor 6 is fixedly connected to the center of the top of the inner wall of the outer shell 1. The outer layer gap 2 is filled with argon gas to form a first-level gaseous heat insulation barrier. The ambient temperature sensor 6 monitors the temperature of the inner wall of the outer shell. When a sudden change in ambient temperature is detected, the outer auxiliary heater 10 is triggered in advance to make adjustments.

[0031] An inert gas valve 8 is provided at the right end of the outer shell 1. An outer auxiliary heater 10 is fixedly connected to the outer wall of the outer constant temperature bath 9. The inert gas valve 8 maintains a constant gas pressure in the outer gap 2 to prevent structural deformation caused by thermal expansion and contraction. The outer auxiliary heater 10 is attached to the outer wall of the outer constant temperature bath 9 and starts heating when the ambient temperature drops suddenly.

[0032] Four ultra-low thermal conductivity inner layer support columns 12 are fixedly connected to the bottom of the inner wall of the outer layer constant temperature bath 9. An inner layer constant temperature bath 13 is fixedly connected to the ultra-low thermal conductivity inner layer support columns 12. The four ultra-low thermal conductivity inner layer support columns 12 suspend the inner layer constant temperature bath 13 in the outer layer bath 9, blocking the heat flow from the outer layer bath to the inner layer bath, and ensuring the independence of the thermal field of the inner layer bath.

[0033] The outer constant temperature bath 9 and the inner constant temperature bath 13 are provided with an inner layer void 11, which is filled with heat insulation material and nano aerogel, forming a second-level solid heat insulation layer. This second layer weakens the residual heat disturbance after the first-level barrier attenuation, thereby reducing the heat transfer efficiency between the environment and the inner layer bath.

[0034] The crystal oscillator 17 has an electrode pin 16 at the bottom. The electrode pin 16 is fixedly connected to a low thermal conductivity lead 4. The low thermal conductivity lead 4 passes through the inner thermostatic bath 13 and the outer thermostatic bath 9 and is fixedly connected to the pin array 5. The electrode pin 16 is connected to the low thermal conductivity lead 4, which is made of titanium alloy and coated with ceramic fiber. It passes through the bath wall, extends the heat conduction path, and reduces the heat leakage of the lead.

[0035] A hole 3 is provided at the connection between the low thermal conductivity lead 4 and the inner constant temperature bath 13 and the outer constant temperature bath 9. The hole 3 is filled with low thermal conductivity sealant. The hole 3 through which the low thermal conductivity lead 4 passes is filled with boron nitride modified silicone. After curing, it forms an airtight heat-blocking plug to isolate the temperature between the baths and prevent temperature difference.

[0036] Working Principle: During use, the outermost gaseous isolation layer is formed by the inert gas-filled gap 2 between the outer shell 1 and the outermost constant temperature bath 9. Combined with the ambient temperature sensor 6, the outermost auxiliary heater 10 is activated for coarse adjustment. The outermost constant temperature bath 9 and the innermost constant temperature bath 13, with the innermost gap 11 filled with thermal insulation material, form the second level of solid barrier. The heating film 14 covering the inner wall of the innermost constant temperature bath 13, through real-time monitoring of the crystal oscillator 17 by the high-precision main temperature sensor 19 and feedback from the auxiliary temperature sensor 15, ensures extremely low temperature difference within the bath. Combined with the physical positioning of the mounting cavity 18, this ensures the crystal oscillator 17 is in a stable environment. Simultaneously, the titanium alloy-coated low thermal conductivity leads 4 connected to the electrode pins 16 pass through the bath, and thermal bridges are blocked at the holes 3 by sealant, connecting with the pin array... The system is connected in column 5. The entire structure is integrated with the inner constant temperature bath 13, which is fully covered by a heating film 14 and the mounting cavity 18. It is equipped with a high-precision main temperature sensor 19 to directly monitor the crystal oscillator 17. At the same time, it is combined with an auxiliary temperature sensor 15. With the help of the uniform heat radiation of the heating film 14, the local hot spots generated by traditional point heating can be eliminated. The auxiliary temperature sensor 15 provides real-time feedback on the temperature difference of the bath wall, which drives the heating film 14 to control the overall temperature difference of the inner bath within a reasonable range. In addition, a double-level thermal barrier is constructed by the outer void 2 filled with inert gas and the inner void 11 filled with heat insulation material to minimize the fluctuation of ambient temperature. With the low thermal conductivity lead wire 4 passing through the groove and the sealant sealing the holes 3, the output frequency stability of the crystal oscillator 17 finally reaches the standard level.

[0037] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A high-precision adjustable isothermal crystal oscillator temperature control device, comprising: The outer shell (1), the outer constant temperature bath (9) and the inner constant temperature bath (13) are characterized in that a heating film (14) is fixedly connected to the inner surface of the inner constant temperature bath (13), an installation cavity (18) is fixedly connected to the inner constant temperature bath (13), and a crystal oscillator (17) is placed in the installation cavity (18). A high-precision main temperature sensor (19) is fixedly connected to the right side of the mounting cavity (18), and auxiliary temperature sensors (15) are fixedly connected to the inner wall of the inner constant temperature bath (13).

2. The high-precision adjustable isotropic crystal oscillator temperature control device according to claim 1, characterized in that, The outer shell (1) is fixedly connected with four low thermal conductivity outer layer support columns (7), and an outer constant temperature tank (9) is fixedly connected to the low thermal conductivity outer layer support columns (7). A pin array (5) is fixedly connected to the inner wall of the outer shell (1).

3. The high-precision adjustable isotropic crystal oscillator temperature control device according to claim 1, characterized in that, An outer layer gap (2) is provided between the outer shell (1) and the outer constant temperature bath (9). The outer layer gap (2) is filled with inert gas. An ambient temperature sensor (6) is fixedly connected to the center of the top of the inner wall of the outer shell (1).

4. The high-precision adjustable isotropic crystal oscillator temperature control device according to claim 1, characterized in that, An inert gas valve (8) is provided at the right end of the outer shell (1), and an outer auxiliary heater (10) is fixedly connected to the outer wall of the outer constant temperature bath (9).

5. The high-precision adjustable isotropic crystal oscillator temperature control device according to claim 1, characterized in that, The bottom of the inner wall of the outer constant temperature bath (9) is fixedly connected to four ultra-low thermal conductivity inner layer support columns (12), and the inner constant temperature bath (13) is fixedly connected to the ultra-low thermal conductivity inner layer support columns (12).

6. The high-precision adjustable isotropic crystal oscillator temperature control device according to claim 1, characterized in that, The outer constant temperature bath (9) and the inner constant temperature bath (13) are provided with an inner layer gap (11), and the inner layer gap (11) is filled with heat insulation material.

7. The high-precision adjustable isotropic crystal oscillator temperature control device according to claim 1, characterized in that, The crystal oscillator (17) has an electrode pin (16) at the bottom. The electrode pin (16) is fixedly connected to a low thermal conductivity lead (4). The low thermal conductivity lead (4) passes through the inner thermostatic bath (13) and the outer thermostatic bath (9) and is fixedly connected to the pin array (5).

8. The high-precision adjustable isotropic crystal oscillator temperature control device according to claim 7, characterized in that, Holes (3) are provided at the connection between the low thermal conductivity lead (4) and the inner constant temperature bath (13) and the outer constant temperature bath (9), and the holes (3) are filled with low thermal conductivity sealant.

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