Two-wire system NTC (Negative Temperature Coefficient) temperature sensor for urban rail train air conditioning unit
By adopting interference fit and threaded connection design in NTC temperature sensor, combined with epoxy resin and high thermal insulation sealant, the problems of low sensor accuracy and slow response are solved, and high sensitivity and stability are achieved in harsh environments. It is suitable for urban rail train air conditioning units.
Patent Information
- Application Number
- CN202422356394.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-26
AI Technical Summary
The existing NTC temperature sensors have low accuracy, cannot accurately detect slight temperature changes, slow response speed, and are unstable in harsh environments.
The shell is tightly crimped to the PTFE sleeve by interference fit and threaded connection, and is filled with epoxy resin and high thermal insulation sealant. The shell is made of 304 stainless steel, and the connector socket has a built-in waterproof O-ring to ensure full sealing and good thermal conductivity.
It achieves high sensitivity, fast response, high accuracy and stability, can accurately detect small temperature changes in harsh environments, has IP68 protection level, is suitable for humid and dust environments, has anti-interference ability and long life.
Smart Images
Figure CN223138826U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sensors, in particular to a two-wire NTC temperature sensor for an urban rail train air-conditioning unit. Background Art
[0002] The two-wire NTC temperature sensor uses an NTC thermistor chip as a temperature sensing element. The connector socket matches the air-conditioning unit installation interface. The vehicle system measures the temperature inside the air-conditioning unit by detecting the resistance value of the NTC chip.
[0003] The existing NTC temperature sensors have low accuracy and cannot accurately detect small temperature changes, nor can they quickly respond to temperature changes. At the same time, due to their structural design, they cannot meet the requirements of stable operation under harsh environmental conditions. Utility Model Content
[0004] The existing NTC temperature sensors have low accuracy and cannot accurately detect small temperature changes, nor can they quickly respond to temperature changes. At the same time, due to their structural design, they cannot meet the requirements of stable operation under harsh environmental conditions.
[0005] The utility model provides a two-wire NTC temperature sensor for an urban rail train air-conditioning unit, comprising an NTC chip, a shell, a PTFE sleeve, a core wire, a contact piece and a connector socket. The inner front end of the shell is provided with an NTC chip, the NTC chip is completely sealed inside the shell, the rear end of the shell is provided with a PTFE sleeve, the shell is tightly pressed onto the PTFE sleeve by an interference fit, the rear end of the PTFE sleeve is threadedly connected with a connector socket, the connector socket and the PTFE sleeve are threadedly connected by a multi-turn pipe, the pin of the NTC chip is connected with a core wire, the other end of the core wire is connected with a contact piece, and the contact piece is located inside the connector socket.
[0006] As a further solution of the utility model: the head of the NTC chip is coated with epoxy resin to be completely encapsulated, and the inside of the shell is filled with heat-conducting insulating sealant.
[0007] As a further solution of the utility model: the interior of the PTFE sleeve is filled with epoxy resin.
[0008] As a further solution of the utility model: the shell is made of 304 stainless steel.
[0009] As a further solution of the utility model: a waterproof O-ring is built into the mounting slot of the connector socket.
[0010] The utility model provides a two-wire NTC temperature sensor for an urban rail train air conditioning unit, which has the following beneficial effects:
[0011] The two-wire NTC temperature sensor for the urban rail train air-conditioning unit tightly presses the outer shell onto the PTFE sleeve by means of interference fit. The pin connection position is completely wrapped with high-temperature resistant insulating material, and the inside of the PTFE sleeve is filled with epoxy resin to provide comprehensive protection. This series of technological measures ensures the complete sealing of the components, enabling the outer shell to reach the IP68 protection level, making it fully applicable to use in harsh environments. At the same time, the outer shell is made of 304 stainless steel. The NTC chip is pre-positioned in the center of the outer shell, and the inside is filled with insulating sealant with a high thermal conductivity coefficient, ensuring good heat conduction of the head of the outer shell, thus effectively improving the heat conduction efficiency of the NTC core and enabling the temperature sensor to respond quickly. Description of the Drawings
[0012] Figure 1 It is a schematic structural diagram of the present utility model.
[0013] In the figure: 1. NTC chip; 2. Outer shell; 3. PTFE sleeve; 4. Core wire; 5. Contact part; 6. Connector socket. Detailed Embodiment
[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0015] Please refer to Figure 1 , the present utility model provides a technical solution: a two-wire NTC temperature sensor for the urban rail train air-conditioning unit, including an NTC chip 1, an outer shell 2, a PTFE sleeve 3, a core wire 4, a contact part 5 and a connector socket 6. The front end inside the outer shell 2 is provided with an NTC chip 1, and the head of the NTC chip 1 is coated with epoxy resin for complete encapsulation, and then a thermally conductive insulating sealant is filled inside the outer shell 2. The NTC chip 1 is completely sealed inside the outer shell 2. The rear end of the outer shell 2 is provided with a PTFE sleeve 3, and the outer shell 2 is tightly pressed onto the PTFE sleeve 3 by means of interference fit. The pin connection position is completely wrapped with high-temperature resistant insulating material, and the inside of the PTFE sleeve 3 is filled with epoxy resin to provide comprehensive protection. This series of technological measures ensures the complete sealing of the components, enabling the outer shell 2 to reach the IP68 protection level, making it fully applicable to use in harsh environments. At the same time, the outer shell 2 is made of 304 stainless steel. The NTC chip 1 is pre-positioned in the center of the outer shell, and the inside is filled with insulating sealant with a high thermal conductivity coefficient, ensuring good heat conduction of the head of the outer shell 2, thus effectively improving the heat conduction efficiency of the NTC chip 1 and enabling the temperature sensor to respond quickly.
[0016] The rear end of the PTFE sleeve 3 is threadedly connected to a connector socket 6. The connector socket 6 and the PTFE sleeve 3 are connected by multiple turns of pipe threads and are sealed and locked using thread sealant to ensure that the connection is secure and has high protection performance. The mounting slot of the connector socket 6 has a built-in waterproof O-ring to further enhance its protection performance.
[0017] A core wire 4 is connected to the pin of the NTC chip 1 , and the other end of the core wire is connected to a contact 5 , which is located inside a connector socket 6 .
[0018] It has the following advantages: High sensitivity: It is highly sensitive to temperature changes and can accurately detect tiny temperature changes.
[0019] Wide temperature range: Covers a wide temperature range, providing reliable measurements from very low to very high temperatures.
[0020] Fast response: Due to its special material and structural design, it has a fast response time and can quickly respond to temperature changes.
[0021] High Precision: Focusing on precision control during the design and manufacturing process, it can provide high-precision temperature measurement results.
[0022] Stability: It has good stability and long-term reliability, and can maintain accurate temperature measurement during long-term use.
[0023] Miniaturization and integration: Miniaturization and integration are achieved, making it easier to integrate into various applications and meet space restriction requirements.
[0024] Anti-interference ability: It has certain anti-interference ability and can work stably under harsh environmental conditions to ensure the accuracy of temperature measurement.
[0025] Fully sealed technology: suitable for humid and dusty environments, long life.
[0026] Flexible shock-absorbing design: By using different potting glues for potting, the probe has excellent anti-vibration and shock performance.
[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. Two-wire NTC temperature sensor for urban rail train air-conditioning unit, comprising an NTC chip (1), a housing (2), a PTFE sleeve (3), core wires (4), contacts (5) and a connector socket (6), characterized in that, An NTC chip (1) is provided at the inner front end of the housing (2). The NTC chip (1) is completely sealed inside the housing (2). A PTFE sleeve (3) is provided at the rear end of the housing (2). The housing (2) is tightly pressed onto the PTFE sleeve (3) by an interference fit. A connector socket (6) is threadedly connected to the rear end of the PTFE sleeve (3). The connector socket (6) and the PTFE sleeve (3) are connected by multiple turns of pipe threads. A core wire (4) is connected to the lead of the NTC chip (1), and the other end of the core wire is connected to a contact (5). The contact (5) is located inside the connector socket (6).
2. The two-wire NTC temperature sensor for the urban rail transit train air conditioner unit according to claim 1, wherein: The head of the NTC chip (1) is coated with epoxy resin for complete encapsulation, and the inside of the housing (2) is filled with a thermally conductive insulating sealant.
3. The two-wire NTC temperature sensor for urban rail train air-conditioning unit according to claim 1, wherein: The inside of the PTFE sleeve (3) is filled with epoxy resin.
4. The two-wire NTC temperature sensor for urban rail train air-conditioning unit according to claim 1, characterized in that: The housing (2) is made of 304 stainless steel.
5. The two-wire NTC temperature sensor for the urban rail transit train air-conditioning unit according to claim 1, wherein: A waterproof O-ring is provided in the installation slot of the connector socket (6).