CN210603569U - Device for reducing temperature drift of electromagnetic force balance - Google Patents
Device for reducing temperature drift of electromagnetic force balance Download PDFInfo
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- CN210603569U CN210603569U CN201921132644.0U CN201921132644U CN210603569U CN 210603569 U CN210603569 U CN 210603569U CN 201921132644 U CN201921132644 U CN 201921132644U CN 210603569 U CN210603569 U CN 210603569U
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Abstract
The utility model provides a device for reducing temperature drift of an electromagnetic force balance, which comprises a framework, wherein the framework is provided with a cylindrical part for winding a coil, and further comprises an annular sleeve body, the annular sleeve body is sleeved outside the framework, the coil wound on the cylindrical part is right opposite to the annular inner wall side of the annular sleeve body, and a sealed space is formed between the cylindrical part and the annular sleeve body through a sealing piece and/or a sealing material; the closed space is a vacuum chamber, and the coil is positioned in the vacuum chamber.
Description
Technical Field
The utility model belongs to the technical field of measuring instrument, concretely relates to reduce device of electronic balance temperature drift.
Background
The electromagnetic force weighing sensor is a core component of the high-precision electronic analytical balance, and the performance of the electromagnetic force weighing sensor directly determines the metering performance of the electronic balance. Temperature drift is one of the main factors affecting the performance of the electromagnetic force sensor. For high-precision electronic balances, it is more important to find factors causing temperature drift and reduce the influence of the factors on the temperature drift.
Since the system measurements are based on electromagnetic force balancing sensors, the main source of the problem is at the sensors. Generally, the temperature change of the electromagnetic force balance sensor is mainly derived from the change of the ambient temperature and the heat generation of the overcurrent element. It can be seen from the balance condition mg — NBIL that, with the change of temperature, the magnetic induction B in the air gap of the permanent magnet, the length L of the moving coil wire, and the resistance RL of the moving coil wire will cause the sensor to generate a corresponding temperature error, and the magnetic induction B of the permanent magnet in the magnetic steel may generate a certain change with the temperature condition.
On the other hand, since the coil is a self-heating body, when the external temperature changes, a certain influence is exerted on the balance itself.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome the above-mentioned not enough that temperature drift easily appears in current electromagnetic force balance, provide a device that can reduce electromagnetic force balance temperature drift.
The technical problem to be solved can be implemented by the following technical scheme.
A device for reducing temperature drift of an electromagnetic force balance comprises a framework, wherein the framework is provided with a cylindrical part for winding a coil, and the device is characterized by further comprising an annular sleeve body, the annular sleeve body is sleeved outside the framework, the coil wound on the cylindrical part is right opposite to the annular inner wall side of the annular sleeve body, and a sealed space is formed between the cylindrical part and the annular sleeve body through sealing of a sealing piece and/or a sealing material; the closed space is a vacuum chamber, and the coil is positioned in the vacuum chamber.
As one of the preferable embodiments of the present invention, the first heat insulating layer is a first heat insulating film coated on the outer side surface of the cylindrical portion.
Also as one of the preferred embodiments of the present invention, the second thermal insulation layer is a second thermal insulation film coated on the side surface of the annular inner wall of the annular sleeve body.
As a further improvement of the technical scheme, the closed space is an annular cavity, the first heat insulation layer and the second heat insulation layer respectively form two side walls of the annular cavity, and the top wall and the bottom wall of the annular cavity are both sealant forming bodies.
According to the device for reducing the temperature drift of the high-precision electromagnetic force balance, the heating source is isolated by designing the vacuum coil device, so that the resistivity change is reduced, the magnetic flux change is further reduced, the influence of the temperature change symmetrical load sensor is reduced, and the weighing precision of the sensor is improved.
Drawings
Fig. 1 is a schematic cross-sectional structural view of the device for reducing temperature drift of an electromagnetic force balance provided by the present invention;
fig. 2 is a schematic structural view of the device of the present invention, as seen from the bottom to the top in fig. 1; i.e., the bottom view of fig. 1;
FIG. 3 is a schematic structural view of the framework of the present invention;
fig. 4 is a schematic structural view of the coil cover of the present invention;
in the figure: 1. a coil housing; 11. an inner wall; 2. a framework outer ring heat insulation film; 3. a coil; 4. A framework; 41. a cylindrical body; 5. sealing glue; 6. the inner wall of the coil sleeve is provided with a heat insulation film; 7. a vacuum chamber; 8. and (7) sealing the glue.
Detailed Description
The following describes in further detail embodiments of the present invention with reference to the accompanying drawings.
The utility model provides a through reduce with delay electromagnetic force weighing sensor's temperature variation reduce electronic balance temperature drift's the weighing error's that causes device. The principle of the device is that the heat conduction speed of the coil device is reduced under the vacuum and heat insulation conditions, the system delays the temperature response change, and the temperature drift in the measurement time period is reduced, so that the detection precision is improved.
The whole system comprises a heat insulation coil, a manipulator and a vacuum pump.
The heat insulation coil comprises the following main components: the coil comprises a coil sleeve 1, a framework outer ring heat insulation film 2, a coil 3, a coil sleeve inner wall heat insulation film 6, a framework 4 and a vacuum chamber 7.
The concrete structure is as follows:
the framework 4 is provided with a cylindrical body 41 which is convenient for winding or placing coils, and the outer wall of the cylindrical body 41 is provided with a framework outer ring heat insulation film 2. The annular coil sleeve 1 is sleeved on the framework 4, the coil sleeve inner wall 11 is provided with a coil sleeve inner wall heat insulation film 6, and the coil 3 is placed between the framework outer ring heat insulation film 2 and the coil sleeve inner wall heat insulation film 6. A sealed space is formed between the coil cover 1 and the cylindrical body 41 by the upper sealant 5 and the lower sealant 8 (see fig. 1), and a vacuum chamber 7 is formed after the coil cover and the cylindrical body are vacuumized. The closed space is an annular space, the top part is provided with a sealant 5, and the bottom part is provided with a sealant 8.
The specific implementation method of the device is as follows: 1. coating a heat insulation film on the outer ring of the framework 4 (namely the outer side part of the cylindrical body 41), coating the heat insulation film on the inner wall 11 of the wire sleeve, winding the coil 3, putting the coil 3 into the framework by using a manipulator, vacuumizing a vacuum chamber 7 in the coil sleeve by using a vacuum pump, and sealing by using sealing glue 5 and 8.
Claims (4)
1. A device for reducing temperature drift of an electromagnetic force balance comprises a framework, wherein the framework is provided with a cylindrical part for winding a coil, and the device is characterized by further comprising an annular sleeve body, the annular sleeve body is sleeved outside the framework, the coil wound on the cylindrical part is right opposite to the annular inner wall side of the annular sleeve body, and a sealed space is formed between the cylindrical part and the annular sleeve body through sealing of a sealing piece and/or a sealing material; the closed space is a vacuum chamber, and the coil is positioned in the vacuum chamber.
2. The apparatus for reducing temperature drift in an electromagnetic force balance of claim 1, wherein the first thermal insulation layer is a first thermal insulation film coated on the outside surface of the cylindrical portion.
3. The apparatus for reducing temperature drift of an electromagnetic force balance as set forth in claim 1, wherein the second thermal insulation layer is a second thermal insulation film coated on a side surface of the annular inner wall of the annular bushing body.
4. The apparatus for reducing temperature drift of an electromagnetic force balance as set forth in claim 1, wherein said enclosed space is an annular cavity, said first and second insulating layers respectively forming two sidewalls of said annular cavity, said top and bottom walls of said annular cavity being formed of a sealant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921132644.0U CN210603569U (en) | 2019-07-18 | 2019-07-18 | Device for reducing temperature drift of electromagnetic force balance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921132644.0U CN210603569U (en) | 2019-07-18 | 2019-07-18 | Device for reducing temperature drift of electromagnetic force balance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210603569U true CN210603569U (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921132644.0U Active CN210603569U (en) | 2019-07-18 | 2019-07-18 | Device for reducing temperature drift of electromagnetic force balance |
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| CN (1) | CN210603569U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110307890A (en) * | 2019-07-18 | 2019-10-08 | 上海舜宇恒平科学仪器有限公司 | A kind of device and method reducing electromagnetic force balance temperature drift |
-
2019
- 2019-07-18 CN CN201921132644.0U patent/CN210603569U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110307890A (en) * | 2019-07-18 | 2019-10-08 | 上海舜宇恒平科学仪器有限公司 | A kind of device and method reducing electromagnetic force balance temperature drift |
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