Temperature alarm composite sensor and alarm method

Abstract

The invention belongs to the technical field of aviation monitoring sensor design, and discloses a temperature alarm composite sensor and an alarm method.The temperature alarm composite sensor comprises a shell and an outer sleeve, a socket and an end cover are arranged on the shell, a circuit board is packaged in the shell and connected with the socket, the outer sleeve is fixedly connected to the end cover, and a temperature probe is installed at the end of the outer sleeve; the temperature probe comprises two platinum resistors which are not in contact with each other, and the two platinum resistors are connected with the circuit board. By adopting the temperature probe dual-redundancy design and the temperature probe is arranged in front, the dynamic response is fast; the temperature probe is subjected to signal conditioning, the temperature measurement precision is high, and the alarm precision is high.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation monitoring sensor design, and in particular relates to a design scheme of a temperature alarm composite sensor and an alarm method. Background Art

[0002] The temperature alarm composite sensor is a monitoring sensor used to measure the ambient temperature. As the demand for ambient temperature detection in aircraft increases, it is no longer limited to real-time monitoring of ambient temperature. It also needs to have the ability to alarm for over-temperature, which puts more stringent requirements on the size and function of the sensor. For miniaturized, highly reliable, and multifunctional temperature sensors, the common processing method is to use temperature and alarm split sensors, but this method takes up a lot of space, has low reliability, and is prone to false alarms.

[0003] This paper proposes a temperature alarm integrated sensor with the aim of further developing and improving aviation temperature sensors. Summary of the invention

[0004] The present invention proposes a temperature alarm composite sensor and an alarm method. The structure adopts a dual-redundancy design of a temperature probe, the temperature alarm function is integrated, the alarm point can be dynamically set, and it has high reliability, high precision, and fast dynamic response capabilities.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A temperature alarm composite sensor comprises: a shell and a jacket, wherein the shell is provided with a socket and an end cover, a circuit board is encapsulated in the shell, the circuit board is connected to the socket, the end cover is fixedly connected to the jacket, a temperature probe is installed at the end of the jacket, the temperature probe comprises two platinum resistors which do not contact each other, and the two platinum resistors are both connected to the circuit board.

[0007] As a further technical solution of the present invention, a protective sleeve is fixedly connected to the outer sleeve, a sleeve is fixedly connected to the protective sleeve, the temperature probe is placed in the sleeve, and the open end of the sleeve is sealed and connected by a plugging cover.

[0008] As a further technical solution of the present invention, a mounting nut is provided on the outer sleeve.

[0009] As a further technical solution of the present invention, a plurality of pillars are provided on the end cover, and the circuit board is fixedly connected to the pillars by screws, and gaskets are also sleeved on the screws.

[0010] As a further technical solution of the present invention, the two platinum resistors are separated by a ceramic material.

[0011] As a further technical solution of the present invention, the shell and the end cover, the outer jacket and the end cover, the outer jacket and the protective sleeve, the protective sleeve and the sleeve, and the plugging cover and the sleeve are all fixedly connected by welding.

[0012] A temperature alarm method, which uses the above-mentioned temperature alarm composite sensor, comprises the following steps:

[0013] Preset alarm temperature threshold programming and temperature signal calculation program on the circuit board;

[0014] Two platinum resistors transmit the collected temperature signals 1 and 2 to the circuit board respectively;

[0015] After being processed by the circuit board, the temperature signal is converted into a numerical signal, of which the first numerical signal is displayed in real time;

[0016] The second numerical signal is compared with the alarm temperature threshold. If the numerical value is greater than the alarm temperature threshold, an alarm is triggered; if not, no alarm is triggered.

[0017] As a further technical solution of the present invention, a self-diagnosis process is also included. After the second numerical signal is compared with the alarm temperature threshold, it is also necessary to compare it with the first numerical signal to prevent false alarms.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. It adopts dual-redundancy design of temperature probe, and the temperature probe is placed in front. The temperature alarm function is integrated, and the alarm point can be set dynamically. It has high reliability, high precision and fast dynamic response capabilities.

[0020] 2. The temperature probe has been signal conditioned, with high temperature measurement accuracy and high alarm accuracy.

[0021] 3. The alarm temperature point can be set externally. By setting the threshold, the alarm point can be set to realize the alarm function. It has strong flexibility and applicability for field use.

[0022] 4. The temperature measurement module and the temperature alarm module are integrated, and the internal space forms a compact structure with a small volume.

[0023] 5. It can realize the two functions of temperature measurement and temperature alarm with a simple structure, which is economical and highly reliable.

[0024] 6. The temperature alarm adopts the self-diagnosis function to prevent false alarms, and the function is reliable and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a temperature alarm composite sensor of the present invention;

[0026] Figure 2It is a structural schematic diagram of the temperature probe of the present invention;

[0027] Figure 3 The figure is a flow chart of a temperature alarm method of the present invention.

[0028] In the figure: housing 12, jacket 5, socket 13, end cover 7, circuit board 9, temperature probe 3, protective sleeve 4, sleeve 2, plugging cover 1, mounting nut 6, support 8, screw 11, gasket 10. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] First, see Figure 1-2 The present invention provides a temperature alarm composite sensor, which includes: a shell 12 and a jacket 5, a socket 13 and an end cap 7 are provided on the shell 12, a circuit board 9 is encapsulated in the shell 12, the circuit board 9 is connected to the socket 13, the jacket 5 is fixedly connected to the end cap 7, a temperature probe 3 is installed at the end of the jacket 5, and the temperature probe 3 includes two non-contacting platinum resistors, the two platinum resistors are both connected to the circuit board 9, and the two platinum resistors are separated by ceramic materials. The temperature probe 3 adopts a dual-redundancy structure design, the structure is compact, and the temperature measurement and temperature alarm independently collect temperature signals.

[0031] The outer jacket 5 is also fixedly connected with a protective sleeve 4, and the protective sleeve 4 is fixedly connected with a sleeve 2. The temperature probe 3 is placed in the sleeve 2, and the open end of the sleeve 2 is sealed and connected through a plug 1. The protective sleeve 4 is welded to the outer jacket 5 to increase the probe length, and the temperature probe 3 is placed in front, thereby improving the dynamic response and the temperature measurement accuracy.

[0032] The mounting nut 6 is sleeved on the outer sleeve 5, and the outer sleeve 5 is welded to the end cover 7, so as to facilitate the installation and fixation of the sensor.

[0033] The end cover 7 is provided with a plurality of pillars 8, and the circuit board 9 is fixedly connected to the pillars 8 by screws 11, and the screws 11 are also sleeved with gaskets 10. The circuit board 9 has temperature measurement and temperature alarm functions, and the threshold value of the circuit board 9 can be set by programming, and the alarm temperature point can be flexibly selected; self-diagnosis is performed when an alarm is given, and an alarm is given after comparing the ambient temperature, thereby reducing the false alarm rate.

[0034] The circuit board 9 includes a temperature measurement function, which is used for real-time acquisition of temperature signals, and compensates for one of the temperature signals of the temperature probe 3 to achieve high-precision measurement of the temperature signal, with an error of no more than ±1°C. The circuit board 9 includes a temperature alarm function, which is used for real-time comparison of temperature signals, and conditions one of the temperature signals of the temperature probe 3 to achieve high-precision alarm of the temperature signal, with an error of no more than ±0.5°C. The circuit board 9 includes a self-diagnosis function, which is used to compare the two temperature signals of the temperature probe 3 with each other. When the measured temperature signal is not equal to the alarm temperature signal, the alarm does not work, thereby reducing the false alarm rate.

[0035] The shell 12 and the end cover 7, the outer sleeve 5 and the end cover 7, the outer sleeve 5 and the protective sleeve 4, the protective sleeve 4 and the casing 2, and the plugging cover 1 and the casing 2 are all fixedly connected by welding. The plugging cover 1 and the casing 2 are laser welded, the casing 2 and the protective sleeve 4 are argon arc welded, the protective sleeve 4 and the outer sleeve 5 are laser welded, and the outer sleeve 5 and the end cover 7 are laser welded. The whole machine is fixed by the mounting nut 6. The product has high structural strength, vibration resistance, and environmental adaptability.

[0036] The product integrates temperature measurement and temperature alarm modules. At the same time, the circuit adds a self-diagnosis function. When the temperature alarm is triggered, the temperature measurement status is compared to prevent false temperature alarms caused by sensor factors other than environmental factors. It has high reliability and does not require a complex control system.

[0037] Second, see Figure 3 The present invention provides a temperature alarm method, which uses the above-mentioned temperature alarm composite sensor and includes the following steps:

[0038] Preset alarm temperature threshold programming and temperature signal calculation program on the circuit board;

[0039] Two platinum resistors transmit the collected temperature signals 1 and 2 to the circuit board respectively;

[0040] After being processed by the circuit board, the temperature signal is converted into a numerical signal, of which the first numerical signal is displayed in real time;

[0041] The second numerical signal is compared with the alarm temperature threshold. If the numerical value is greater than the alarm temperature threshold, an alarm is triggered; if not, no alarm is triggered.

[0042] It also includes a self-diagnosis process. After the second numerical signal is compared with the alarm temperature threshold, it must also be compared with the first numerical signal to prevent false alarms.

[0043] The temperature measurement and temperature alarm function acquisition signals are independent of each other. The temperature measurement working process is to acquire the platinum resistance 1 signal, output temperature signal 1 after signal compensation, and then display it in real time through the socket to output a continuous signal to achieve high-precision temperature measurement; the temperature alarm working process is to acquire the platinum resistance 2 signal, output temperature signal 2 after signal compensation; then the alarm threshold point can be set through external programming. When temperature signal 2 reaches the threshold point, it will perform logical judgment with temperature signal 1 at the same time. If the judgment result is equal to temperature signal 2, the alarm signal is output and the discrete signal is output through the socket; if the judgment result is not equal, the alarm signal is not output.

[0044] So far, the purpose of the present invention has been achieved.

[0045] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A temperature alarm composite sensor, characterized in that , including a shell and a jacket, a socket and an end cover are provided on the shell, a circuit board is encapsulated in the shell, the circuit board is connected to the socket, the end cover is fixedly connected to the jacket, a temperature probe is installed at the end of the jacket, the temperature probe includes two platinum resistors that do not contact each other, and the two platinum resistors are both connected to the circuit board.

2. A temperature alarm composite sensor according to claim 1, characterized in that: The outer jacket is also fixedly connected with a protective sleeve, the protective sleeve is fixedly connected with a sleeve, the temperature probe is arranged in the sleeve, and the open end of the sleeve is sealed and connected via a plugging cover.

3. A temperature alarm composite sensor according to claim 2, characterized in that: The outer sleeve is provided with a mounting nut.

4. A temperature alarm composite sensor according to claim 3, characterized in that: The end cover is provided with a plurality of pillars, the circuit board is fixedly connected to the pillars by screws, and the screws are also sleeved with gaskets.

5. A temperature alarm composite sensor according to claim 4, characterized in that: The two platinum resistors are separated by a ceramic material.

6. A temperature alarm composite sensor according to claim 5, characterized in that: The shell and the end cover, the outer jacket and the end cover, the outer jacket and the protective sleeve, the protective sleeve and the sleeve, and the plugging cover and the sleeve are all fixedly connected by welding.

7. A temperature alarm method, characterized in that: Using a temperature alarm composite sensor as described in any one of claims 1 to 6 comprises the following steps: Preset alarm temperature threshold programming and temperature signal calculation program on the circuit board; Two platinum resistors transmit the collected temperature signals 1 and 2 to the circuit board respectively; After being processed by the circuit board, the temperature signal is converted into a numerical signal, of which the first numerical signal is displayed in real time; The second numerical signal is compared with the alarm temperature threshold. If the numerical value is greater than the alarm temperature threshold, an alarm is triggered; if not, no alarm is triggered.

8. A temperature alarm method according to claim 7, characterized in that: It also includes a self-diagnosis process. After the second numerical signal is compared with the alarm temperature threshold, it must also be compared with the first numerical signal to prevent false alarms.

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