Intelligent acquisition temperature sensing bulb

Abstract

An intelligent acquisition temperature sensing bulb belongs to the field of density controllers, and is characterized by comprising a temperature sensing bulb cover, an air chamber connecting piece, a hose joint and a capillary tube which are connected in sequence, the temperature sensing bulb cover is a cylindrical cover body; the front end of the thermal bulb cover is closed, and a glass sintered part is fixedly arranged at the tail end; a PCB is arranged on the side, facing the front end of the thermal bulb cover, of the glass sintered part. And a temperature and pressure integrated sensor is arranged on the PCB. The temperature and pressure integrated sensor arranged on the temperature sensing bulb is used for collecting the temperature in the temperature sensing bulb to serve as a temperature source for electronic temperature compensation calculation of the remote meter, meanwhile, the capillary tube feeds back a pressure value changing along with the temperature in the temperature sensing bulb to a standard compensation air chamber of the density controller, and accurate temperature compensation action is formed. The purpose that mechanical indication of the meter and temperature compensation of an electronic remote transmission part are both represented by the temperature in the air chamber of the equipment is achieved, and the problem of inaccuracy caused by the fact that an existing traditional density controller collects environment temperature to replace the temperature of the air chamber is solved.

Description

Technical Field

[0001] This utility model belongs to the field of density controllers, and in particular relates to an intelligent temperature sensing bag. Background Technology

[0002] In the high-voltage electrical transmission and transformation industry, SF6 density controllers (referred to as density meters) are widely used. Their real-time monitoring and issuance of low-voltage alarm and interlocking signals ensure the safe operation of high-voltage switchgear. The compensation accuracy of the density controller is its key technical indicator, especially with the implementation of the State Grid Q / GDW12355.4 digital remote transmission meter, which requires even higher compensation accuracy for the electronic components.

[0003] However, traditional density controller temperature compensation has its inherent application limitations, namely, it requires the temperature in the monitored gas chamber to remain consistent with the temperature sensed by the standard tube or bimetallic strip of the compensation element in the meter within a certain equilibrium period.

[0004] As is well known, the temperature of meters originates from the ambient temperature, and the temperature of the sealed gas chamber in high-voltage switchgear also primarily originates from the ambient temperature. However, the volume difference between the two is significant, and the time required for temperature maintenance also differs considerably. The industry generally assumes that the tank temperature is roughly equivalent to the ambient temperature during operation. Therefore, under conditions of large diurnal temperature variations or sudden environmental changes, the meter reacts too quickly, while the gas chamber reacts too slowly, leading to meter temperature compensation failure. Examples include direct sunlight on the meter in the morning, short-term heavy rainfall, and snowfall. Another issue arises in special environments, such as extremely cold regions. To prevent the insulating gas (SF6) inside the gas chamber from liquefying at low temperatures, switchgear in these areas often uses heating belts wrapped around the gas chamber for heating. Once heating belts are used, the temperature compensation principle of the density controller almost completely fails. Therefore, it is necessary to develop a device that can directly reflect the true temperature of the gas chamber, allowing the density meter's temperature compensation to avoid the impact of ambient temperature changes and the use of heating devices. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned problems by providing an intelligent temperature sensing bag that solves the problem of temperature compensation failure caused by the inconsistency between the temperature of the traditional density meter and the temperature of the equipment air chamber.

[0006] The intelligent temperature sensing bag of this utility model includes a temperature sensing bag cover, an air chamber connector, a hose connector and a capillary tube connected in sequence.

[0007] The temperature sensing cover is a cylindrical cover; the front end of the temperature sensing cover is closed, and a glass sintered component is fixedly installed at the rear end; the hose connector, the gas chamber connector and the glass sintered component are all provided with connecting through holes along the central axis;

[0008] One end of the hose connector is connected to the aforementioned air chamber connector, and the other end is connected to the density meter via a cable;

[0009] One end of the capillary tube is connected to the standard compensation gas chamber inside the density meter, and the other end extends into the aforementioned temperature sensing cover through the aforementioned connecting hole; both ends of the capillary tube are open, connecting the standard compensation gas chamber and the temperature sensing cover from the gas path, so as to achieve the consistency of gas pressure between the standard compensation gas chamber inside the density meter and the temperature sensing cover.

[0010] A PCB board is provided on the side of the glass sintered part facing the front end of the temperature sensing cover;

[0011] The PCB board is equipped with an integrated temperature and pressure sensor;

[0012] The integrated temperature and pressure sensor is connected to the aforementioned cable.

[0013] Furthermore, in the intelligent temperature sensing bulb of this utility model, the glass sintered part is provided with a number of terminal pins;

[0014] One end of the terminal pin is connected to the aforementioned PCB board, and the other end is connected to the aforementioned cable; the electrical connection between the two sides of the sintered part is achieved by setting the terminal pin.

[0015] Furthermore, in the intelligent temperature sensing envelope of this utility model, a hollow tube is provided at the connecting through hole on the glass sintered part; the aforementioned capillary tube passes through the hollow tube; the two ends of the hollow tube are sealed with the tube wall of the capillary tube; thereby realizing that the high pressure gas inside the temperature sensing envelope is connected to the standard compensation gas chamber of the density meter through the capillary tube, avoiding data errors caused by the connection between the temperature sensing envelope and the external air pressure.

[0016] Furthermore, in the intelligent temperature sensing bag described in this utility model, an insulating pad is provided between the PCB board and the glass sintered component to achieve electrical isolation.

[0017] Furthermore, in the intelligent temperature sensing device described in this utility model, the cable and capillary between the flexible hose connector and the density meter are wrapped with a metal flexible hose or a plastic-coated flexible hose to protect the capillary and cable.

[0018] The intelligent temperature sensing element described in this invention improves upon existing traditional density controllers. It is installed inside the gas chamber of the switching equipment or placed near a location reflecting the gas chamber temperature. A temperature-pressure integrated sensor integrated into the sensing element collects the temperature within the element, which is used as the temperature source for the electronic temperature compensation calculation of the remote transmission meter. Simultaneously, the pressure value within the sensing element, which changes with temperature, is fed back to the standard compensation gas chamber of the density controller via a capillary tube, forming an accurate temperature compensation action. This achieves the goal of using the temperature inside the equipment's gas chamber to represent both the mechanical indication of the meter and the temperature compensation of the electronic remote transmission section. This solves the inaccuracy problem caused by existing traditional density controllers using ambient temperature instead of gas chamber temperature. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the intelligent temperature sensing bag structure described in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the longitudinal section structure of the glass sintered part according to an embodiment of the present invention;

[0021] Figure 3 This is a top view of the glass sintered part described in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the application structure of the intelligent temperature sensing bag described in an embodiment of this utility model;

[0023] Among them, 1-temperature sensing cover, 11-glass sintered part, 12-insulating pad, 13-PCB board, 14-temperature and pressure integrated sensor, 15-hollow tube, 16-terminal pin, 2-gas chamber connector, 3-hose connector, 4-cable, 5-capillary tube, 6-density meter, 61-standard compensation gas chamber, 7-plastic coated hose. Detailed Implementation

[0024] The intelligent temperature sensing bag of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0025] This embodiment discloses an intelligent temperature sensing bag, such as Figure 1 As shown, the device includes a temperature-sensing cover 1, a gas chamber connector 2, a hose connector 3, and a capillary tube 5 connected in sequence. The temperature-sensing cover 1 is a cylindrical cover. The front end of the temperature-sensing cover 1 is closed, and a glass sintered component 11 is fixedly installed at the rear end. The hose connector 3, the gas chamber connector 2, and the glass sintered component 11 are all provided with connecting through holes along their central axes. One end of the hose connector 3 is connected to the aforementioned gas chamber connector 2, and the other end is connected to a density meter 6 via a cable 4. One end of the capillary tube 5 is connected to a standard compensation gas chamber 61 inside the density meter 6, and the other end extends into the aforementioned temperature-sensing cover 1 through the aforementioned connecting through hole. A PCB board 13 is provided on the side of the glass sintered component 11 facing the front end of the temperature-sensing cover 1. A temperature and pressure integrated sensor 14 is provided on the PCB board 13, and the temperature and pressure integrated sensor 14 is connected to the aforementioned cable 4.

[0026] In the embodiments disclosed herein, such as Figure 3 As shown, the glass sintered component 11 is provided with six terminal pins 16; one end of each terminal pin 16 is connected to the aforementioned PCB board 13, and the other end is connected to the aforementioned cable 4. Figure 2As shown, a hollow tube 15 is provided at the connection through hole on the glass sintered component 11; the aforementioned capillary tube 5 passes through the hollow tube 15; the two ends of the hollow tube 15 are sealed to the tube wall of the capillary tube 5 to prevent the temperature sensing cover 1 from being connected to the external air pressure. An insulating pad 12 is provided between the PCB board 13 and the glass sintered component 11 to achieve electrical isolation. The electrical pins of the aforementioned integrated temperature and pressure sensor 14 are connected to the aforementioned cable 4 through the terminal pins 16 of the sintered component.

[0027] In this embodiment, the intelligent temperature sensing bulb is assembled by welding the temperature sensing bulb cover 1, the gas chamber connector 2, and the hose connector 3 into a single unit. The temperature sensing bulb cover 1 is a cylindrical copper cover with a closed front end and a glass sintered component 11 at the rear end, which are welded together to ensure a seal. The outer side of the temperature sensing bulb cover 1 is argon-arc welded to the gas chamber connector 2 and sealed. The gas chamber connector 2 and the hose connector 3 are connected by threads, and the hose connector 3 is a standard part.

[0028] In this embodiment, the glass sintered component 11 is a stainless steel shell with six terminal pins 16 and a hollow tube 15 at its center, forming a glass sintering mold. A PCB board 13 is provided on the side of the glass sintered component 11 facing the front end of the temperature-sensing cover 1, with an insulating pad 12 between them for electrical isolation. In this embodiment, the PCB board 13 is circular, with pads corresponding to the terminal pins 16, and a surface-mount temperature and pressure integrated sensor 14. In this embodiment, the temperature and pressure integrated sensor 14 is a TE gel-type pressure sensor. In practical applications, a piezoresistive sensor can also be used. The circuit pins of the PCB board 13 are correspondingly arranged with the terminal pins 16 and connected by soldering.

[0029] In practical applications, such as Figure 4 As shown, the density meter 6 is a conventional SF6 density meter based on the gas reference compensation principle. The standard compensation chamber 61 is a corrugated pipe. The capillary tube 5, extending from the standard compensation chamber 61 of the density meter 6, extends from the housing of the density meter 6, passes through the hose connector 3, and then through the hollow tube 15 before entering the interior of the temperature sensing cover 1. The port of the hollow tube 15 is brazed and sealed to the capillary tube 5. One end of the cable 4 is firmly soldered to the terminal pin 16, and the other end extends into the density meter 6, connecting to the remote transmission circuit board inside the meter. The cable 4 between the hose connector 3 and the density meter 6, and the capillary tube 5 are wrapped with a standard-sized plastic-coated hose 7 to protect the capillary tube 5 and the cable 4.

[0030] In this embodiment, the gas chamber connector 2 has an external thread, which connects to and seals with the gas chamber of the high-voltage switchgear. During operation, the compensation point pressure at 20°C is introduced through a standard tube, and a sealed standard gas chamber is formed between the capillary tube 5 and the inside of the temperature-sensing cover 1. The temperature-sensing cover 1 is located inside the equipment gas chamber and has the same temperature as the equipment gas chamber. After sensing the temperature of the equipment gas chamber, the sealed standard gas chamber converts it into its own pressure change, which is transmitted to the standard compensation gas chamber 61. The standard compensation gas chamber 61 performs corresponding compensation actions based on the pressure value, thus completing the temperature compensation of the mechanical part indirectly derived from the temperature inside the equipment gas chamber. Furthermore, the integrated temperature and pressure sensor 14 collects the temperature inside the gas chamber and transmits it digitally to the density table 6, calculating the density value inside the equipment gas chamber that is closest to the true value, thus completing the temperature compensation of the remote transmission part.

[0031] The intelligent temperature sensing bag described in this embodiment effectively solves the error that occurs when the traditional SF6 density meter uses the ambient temperature instead of the equipment's gas chamber temperature, and avoids the problem of meter indication failure caused by excessive temperature difference between the two. It can greatly improve the accuracy of the meter in the field.

Claims

1. An intelligent temperature sensing and collecting device, characterized in that: The temperature sensing cover, the air chamber connecting piece, the hose joint and the capillary are sequentially connected; The temperature sensing cover is a cylindrical cover body; the front end of the temperature sensing cover is closed, and the tail end is fixedly provided with a glass sintering piece; a connecting through hole is formed in the temperature sensing cover, the air chamber connecting piece, the hose joint and the glass sintering piece along the central axis; One end of the hose joint is connected with the air chamber connecting piece, and the other end is connected with the density meter through a cable; One end of the capillary is connected with a standard compensation air chamber in the density meter, and the other end extends into the temperature sensing cover through the connecting through hole; The glass sintering piece is provided with a PCB on the side facing the front end of the temperature sensing cover; The PCB is provided with a temperature and pressure integrated sensor; The temperature and pressure integrated sensor is connected with the cable.

2. The intelligent temperature sensing device according to claim 1, wherein: The glass sintering piece is provided with a plurality of terminal pins; One end of the terminal pin is connected with the PCB, and the other end is connected with the cable.

3. The intelligent temperature sensing device according to claim 1 or 2, wherein: A hollow tube is arranged at the connecting through hole of the glass sintering piece; the capillary passes through the hollow tube; and the two ends of the hollow tube are sealingly arranged with the wall of the capillary.

4. The intelligent temperature sensing device according to claim 3, wherein: An insulating pad is arranged between the PCB and the glass sintering piece.

5. The intelligent temperature sensing device according to claim 4, wherein: The cable and the capillary between the hose joint and the density meter are wrapped with a metal hose or a plastic-coated hose.

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