Air conditioner

Abstract

The utility model provides a kind of temperature monitoring structure and air conditioner, temperature monitoring structure includes capillary metal pipe and fiber grating sensor, capillary metal pipe is worn and is equipped with air conditioner pipeline, the monitoring section of fiber grating sensor is arranged inside capillary metal pipe, and the monitoring section of fiber grating sensor has grating inside air conditioner pipeline, gap is left between grating and the inner wall of capillary metal pipe;The utility model encapsulates fiber grating sensor by capillary metal pipe, implants into air conditioner pipeline inside, simultaneously makes fiber grating sensor only sensitive to temperature, is not influenced by outside strain, real-time monitoring the temperature change of refrigerant inside air conditioner pipeline.Solve traditional thermistor temperature measurement inaccuracy, temperature change response slow, low security and other problems.Use fiber grating sensor to carry out temperature monitoring to refrigerant in air conditioner pipeline, temperature change response fast, temperature monitoring precision is high, temperature monitoring process has no explosion risk, high security.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning, and more specifically, it relates to a temperature monitoring structure and an air conditioner. Background Technology

[0002] Currently, air conditioners rely on intelligent control based on the temperature changes of the refrigerant in different components to maintain normal operation and ensure a safe, energy-efficient, and high-performance state. Missing refrigerant parameters can cause air conditioner malfunctions and even pose a risk of fire or explosion. Therefore, the ability to accurately monitor the refrigerant temperature of different components during air conditioner operation determines its performance and reliability.

[0003] Traditional methods for monitoring refrigerant temperature in air conditioning pipes involve placing temperature-sensing bulbs, typically thermistors, on the outer surface of each pipe. These bulbs effectively monitor the refrigerant temperature. However, this method is susceptible to the influence of ambient temperature, leading to inaccurate temperature monitoring.

[0004] Therefore, how to provide a more accurate temperature monitoring solution is an urgent problem that needs to be solved in the industry. Utility Model Content

[0005] The purpose of this invention is to provide a temperature monitoring structure and an air conditioner to solve the problem that existing temperature monitoring methods are easily affected by the external ambient temperature, resulting in inaccurate temperature monitoring.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides a temperature monitoring structure for monitoring the refrigerant temperature in an air conditioning pipe. It includes a capillary metal tube and a fiber Bragg grating sensor. The capillary metal tube passes through the air conditioning pipe, and the monitoring section of the fiber Bragg grating sensor is located inside the capillary metal tube. The monitoring section of the fiber Bragg grating sensor has a grating located inside the air conditioning pipe, and a gap is left between the grating and the inner wall of the capillary metal tube.

[0008] Furthermore, the grating is placed along the axial direction of the air conditioning pipe.

[0009] Furthermore, the capillary metal tube is connected to the air conditioning pipe by welding.

[0010] Furthermore, a sealing element is provided at the connection between the capillary metal tube and the air conditioning pipe.

[0011] Furthermore, the capillary metal tube is provided with an anti-sway component at a location inside the air conditioning pipe.

[0012] Furthermore, the capillary metal tube is connected to the fiber optic grating sensor by adhesive bonding.

[0013] Furthermore, the capillary metal tube is connected to the fiber optic grating sensor via laser welding.

[0014] Furthermore, the capillary metal tube is a capillary copper tube.

[0015] This utility model also provides an air conditioner, including an air conditioner controller and a compressor, a condenser and an evaporator connected in sequence through air conditioner pipes to form a refrigerant circulation loop. The feature is that it also includes an optical fiber demodulation device. The air conditioner pipes are provided with the temperature monitoring structure described above. The optical fiber demodulation device is connected to the fiber optic grating sensor and the air conditioner controller respectively.

[0016] Furthermore, the air conditioner is a heat pump air conditioner.

[0017] Compared with existing technologies, the beneficial effects of the temperature monitoring structure and air conditioner provided by this invention are as follows: This invention encapsulates a fiber optic grating sensor through a capillary metal tube and implants it inside the air conditioning pipe. Simultaneously, the fiber optic grating sensor is only sensitive to temperature and is unaffected by external strain, enabling real-time monitoring of the temperature changes of the refrigerant inside the air conditioning pipe. This solves the problems of inaccurate temperature measurement, slow temperature change response, and low safety associated with traditional thermistors. Using a fiber optic grating sensor to monitor the temperature of the refrigerant inside the air conditioning pipe results in fast temperature change response, high temperature monitoring accuracy, and no risk of explosion during the temperature monitoring process, ensuring high safety. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the temperature monitoring structure proposed in this utility model;

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 This is a partial schematic diagram of the air conditioner proposed in this utility model;

[0022] The main markings in the attached figures are as follows:

[0023] 1. Temperature monitoring structure;

[0024] 11. Capillary metal tube;

[0025] 12. Fiber Bragg grating sensor;

[0026] 131. Grating;

[0027] 2. Air conditioning;

[0028] 21. Air conditioning piping;

[0029] 22. Fiber optic demodulation device;

[0030] 23. Air conditioner controller;

[0031] 24. Data cable. Detailed Implementation

[0032] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0033] Currently, air conditioners rely on intelligent control based on the temperature changes of the refrigerant in different components to maintain normal operation and ensure a safe, energy-efficient, and high-performance state. Missing refrigerant parameters can cause air conditioner malfunctions and even pose a risk of fire or explosion. Therefore, the ability to accurately monitor the refrigerant temperature of different components during air conditioner operation determines its performance and reliability.

[0034] Traditional methods for monitoring refrigerant temperature in air conditioning pipes involve placing temperature-sensing bulbs, typically thermistors, on the outer surface of each pipe. While these bulbs effectively monitor the refrigerant temperature, they also have the following drawbacks:

[0035] 1. Thermistors have poor performance in temperature monitoring, with low accuracy and large errors. Furthermore, they can only be placed on the outer surface of pipes, making them susceptible to the influence of ambient temperature, leading to inaccurate temperature monitoring. Additionally, thermistors have a slow response time to changes in temperature. In air conditioning, this manifests as a 7-10°C difference between the monitored exhaust temperature and the actual temperature. This causes a delay in the unit's high-temperature exhaust protection mechanism, resulting in unit malfunctions and even compressor damage.

[0036] 2. Thermistors are electrical sensors. During operation, their circuitry may generate electrical sparks. Since air conditioning pipes contain refrigerant, if flammable and explosive refrigerant is used, using a thermistor to monitor the refrigerant temperature in the pipes may cause an explosion, posing a safety hazard.

[0037] In response to the problems raised above, this utility model proposes a temperature monitoring structure and an air conditioner based on a fiber optic grating sensor.

[0038] Example 1

[0039] Please see Figure 1 , Figure 2 The temperature monitoring structure 1 proposed in this utility model is used to monitor the refrigerant temperature in the air conditioning pipe 21. This temperature monitoring structure 1 includes a capillary metal tube 11 and a fiber optic grating sensor 12. The capillary metal tube 11 passes through the air conditioning pipe 21. The monitoring section of the fiber optic grating sensor 12 is located inside the capillary metal tube 11, and the monitoring section of the fiber optic grating sensor 12 has a grating 131 located inside the air conditioning pipe 21. A gap is left between the grating 131 and the inner wall of the capillary metal tube 11.

[0040] Thus, this invention encapsulates the fiber Bragg grating sensor 12 within a capillary metal tube 11 and implants it inside the air conditioning pipe 21. Simultaneously, the fiber Bragg grating sensor 12 is only sensitive to temperature, unaffected by external strain, allowing for real-time monitoring of refrigerant temperature changes within the air conditioning pipe 21. This solves the problems of inaccurate temperature measurement, slow temperature change response, and low safety associated with traditional thermistors. Using the fiber Bragg grating sensor 12 to monitor the refrigerant temperature within the air conditioning pipe 21 provides fast temperature change response, high temperature monitoring accuracy, and eliminates the risk of explosion during the monitoring process, ensuring high safety.

[0041] It should be noted that the length of the monitoring section of the fiber Bragg grating sensor 12 should be greater than the length of the grating 131 to ensure that the grating 131 is completely encapsulated in the capillary metal tube 11. Preferably, during encapsulation, part of the coating layer of the fiber Bragg grating sensor 12 is removed to expose the grating 131. The resulting uncoated portion is the monitoring section, with the grating 131 located in the middle of the monitoring section. Then, the monitoring section of the fiber Bragg grating sensor 12 is encapsulated using the capillary metal tube 11. To ensure that the fiber Bragg grating sensor 12 is only sensitive to temperature and not affected by external strain, a gap is left between the grating 131 and the inner wall of the capillary metal tube 11 to ensure that the grating 131 and the inner wall of the capillary metal tube 11 are not fixed. At the same time, the high thermal conductivity of the capillary metal tube 11 can ensure the temperature sensitivity of the fiber Bragg grating sensor 12.

[0042] It should be understood that the fiber optic grating sensor 12 is a sensor that utilizes the effect of periodic refractive index changes on light propagating in an optical fiber to produce wavelength-selective reflection. When a light wave propagating in the optical fiber encounters the grating 131, only light of a specific wavelength that matches the period of the grating 131 is strongly reflected, while light of other wavelengths passes through the grating 131. When physical quantities change, such as temperature, pressure, or strain, the period of the grating 131 will be affected. and the refractive index of optical fibers This changes. This will cause the wavelength reflected through the fiber optic grating to change. By measuring the change in the reflected wavelength, the change in the physical quantity experienced by the grating 131 can be calculated.

[0043] For the fiber Bragg grating sensor 12 of this invention, the fiber Bragg grating is only affected by temperature, therefore the change in wavelength can generally be expressed as a linear function:

[0044]

[0045] This refers to the change in center wavelength caused by temperature effects on the fiber Bragg grating. The initial center wavelength when unaffected by temperature; The temperature sensitivity coefficient of the fiber Bragg grating; This represents the change in temperature.

[0046] Therefore, when a change in the reflected wavelength of the fiber optic grating is detected, the change in the refrigerant temperature inside the air conditioning pipe 21 can be determined.

[0047] like Figure 1 , Figure 2 As shown, the grating 131 is placed along the axial direction of the air conditioning pipe 21. This design reduces fluid impact and minimizes the influence of refrigerant flow. When the refrigerant flows axially in the air conditioning pipe 21, since both the capillary metal tube 11 and the monitoring section of the fiber Bragg grating sensor 12 have straight sections arranged along the axial direction of the air conditioning pipe 21, placing the grating 131 axially reduces the lateral impact of the refrigerant, thereby reducing the physical disturbance of the refrigerant flow to the fiber Bragg grating sensor 12 and improving the accuracy of temperature monitoring.

[0048] The capillary metal tube 11 is connected to the air conditioning pipe 21 by welding. This design ensures the airtightness of the air conditioning pipe 21 and prevents refrigerant leakage. The welding process creates a seamless connection between the capillary metal tube 11 and the air conditioning pipe 21, completely isolating the risk of refrigerant leakage and avoiding system efficiency degradation or safety hazards caused by refrigerant leakage. At the same time, this welding connection is very strong and can resist external forces such as vibration of the air conditioning pipe 21 and refrigerant flow impact, preventing displacement of the capillary metal tube 11 and the monitoring section of its internal fiber optic grating sensor 12.

[0049] A sealing element is provided at the connection between the capillary metal tube 11 and the air conditioning pipe 21. The sealing element can be a rubber plug. The outer wall of the rubber plug is sealed to the inner wall of the air conditioning pipe 21, and the inner wall of the rubber plug is sealed to the outer wall of the capillary metal tube 11. This design can enhance the sealing performance at the connection between the capillary metal tube 11 and the air conditioning pipe 21, ensure that the air conditioning pipe 21 is airtight, prevent refrigerant leakage, and improve safety.

[0050] An anti-sloshing component, which can be a flow guide, is installed inside the air conditioning pipe 21 in the capillary metal tube 11. This design can prevent the capillary metal tube 11 from sloshing due to the high-speed flow of refrigerant, which could cause the internal grating 131 of the capillary metal tube 11 to collide with its inner wall. By suppressing vibration and displacement, the anti-sloshing component ensures the stability of the direct contact between the capillary metal tube 11 and the refrigerant, thereby improving the accuracy of temperature monitoring.

[0051] The capillary metal tube 11 and the fiber Bragg grating sensor 12 are connected by adhesive bonding, laser welding, or electroplating. This design achieves a connection method that balances packaging stability, environmental resistance, and process feasibility. If the capillary metal tube 11 and the fiber Bragg grating sensor 12 are connected by adhesive bonding, no high-precision equipment is required, operation is flexible, and it is suitable for combining capillary metal tubes 11 and fiber Bragg grating sensors 12 with complex shapes. Special adhesives that are resistant to high temperatures and refrigerant corrosion can be used, adapting to the internal environment of the air conditioning pipe 21. If the capillary metal tube 11 and the fiber Bragg grating sensor 12 are connected by laser welding, the weld is dense, with high mechanical strength, and can withstand the impact caused by high-speed refrigerant flow or vibration of the air conditioning pipe 21, ensuring that the capillary metal tube 11 and the fiber Bragg grating sensor 12 do not experience relative displacement. If the capillary metal tube 11 and the fiber optic grating sensor 12 are fixedly connected by electroplating, a metal coating is formed at the connection between the capillary metal tube 11 and the fiber optic grating sensor 12 by electrochemical deposition, and the connection interface is gapless, thus improving the overall rigidity.

[0052] The capillary metal tube 11 is a capillary copper tube. Since the thermal conductivity of the capillary copper tube is much higher than that of capillary stainless steel tubes, it can quickly transmit the temperature change of the refrigerant to the fiber Bragg grating sensor 12, reduce the thermal hysteresis effect, and thus improve the temperature monitoring accuracy. At the same time, the capillary copper tube has excellent corrosion resistance in the refrigerant environment, avoiding the failure of the capillary metal tube 11 and the fiber Bragg grating sensor 12 inside due to chemical corrosion inside the air conditioning pipe 21.

[0053] Example 2

[0054] Please refer to the following: Figures 1 to 3 The air conditioner 2 proposed in this utility model not only includes an air conditioner controller 23 and a compressor, condenser and evaporator connected in sequence through an air conditioner pipe 21 to form a refrigerant circulation loop, but also includes an optical fiber demodulation device 22. A temperature monitoring structure 1 is provided in the air conditioner pipe 21, and the optical fiber demodulation device 22 is connected to the fiber optic grating sensor 12 and the air conditioner controller 23 respectively.

[0055] The temperature monitoring structure 1 includes a capillary metal tube 11 and a fiber Bragg grating sensor 12. The capillary metal tube 11 passes through the air conditioning pipe 21. The monitoring section of the fiber Bragg grating sensor 12 is located inside the capillary metal tube 11, and the monitoring section of the fiber Bragg grating sensor 12 has a grating 131 located inside the air conditioning pipe 21. A gap is left between the grating 131 and the inner wall of the capillary metal tube 11.

[0056] It should be noted that the shape and structure of the air conditioning pipe 21 and the number of fiber optic grating sensors 12 inside the air conditioning pipe 21 can be set according to actual needs, and are not limited here.

[0057] Thus, this invention encapsulates the fiber Bragg grating sensor 12 within a capillary metal tube 11 and implants it inside the air conditioning pipe 21. This allows the fiber Bragg grating sensor 12 to be sensitive only to temperature, unaffected by external strain, enabling real-time monitoring of refrigerant temperature changes within the air conditioning pipe 21. Due to its small size, the fiber Bragg grating sensor 12 can be implanted inside the air conditioning pipe 21 without significantly damaging the existing structure. The fiber Bragg grating sensor 12 operates as an optical system near the object being measured, preventing the generation of electrical sparks. Its circuitry, connected via optical fiber, allows it to be placed away from the object, eliminating the risk of explosion or other safety hazards. This solves the problems of inaccurate temperature measurement, slow response to temperature changes, and low safety associated with traditional thermistors. Using the fiber Bragg grating sensor 12 for refrigerant temperature monitoring within the air conditioning pipe 21 provides fast temperature change response, high temperature monitoring accuracy, and eliminates the risk of explosion during the monitoring process, ensuring high safety. Furthermore, by integrating the fiber optic sensing system with the air conditioning system 2, real-time monitoring of the internal temperature of the air conditioning pipe throughout its entire lifecycle and real-time feedback control of the air conditioning system based on temperature changes can be achieved.

[0058] Regarding the temperature monitoring structure 1, it should be noted that the length of the monitoring section of the fiber Bragg grating sensor 12 should be greater than the length of the grating 131 to ensure that the grating 131 is completely encapsulated within the capillary metal tube 11. Preferably, during encapsulation, part of the coating layer of the fiber Bragg grating sensor 12 is removed, exposing the grating 131. The resulting uncoated portion is the monitoring section, with the grating 131 located in the middle of the monitoring section. Then, the monitoring section of the fiber Bragg grating sensor 12 is encapsulated using the capillary metal tube 11. To ensure that the fiber Bragg grating sensor 12 is only sensitive to temperature and not affected by external strain, a gap is left between the grating 131 and the inner wall of the capillary metal tube 11, ensuring that the grating 131 and the inner wall of the capillary metal tube 11 are not fixed. Simultaneously, the high thermal conductivity of the capillary metal tube 11 ensures the temperature sensitivity of the fiber Bragg grating sensor 12. More preferably, the grating 131 is placed along the axial direction of the air conditioning pipe 21. This design reduces fluid impact and minimizes the influence of refrigerant flow. When the refrigerant flows axially in the air conditioning pipe 21, since both the capillary metal tube 11 and the monitoring section of the fiber Bragg grating sensor 12 have straight sections arranged axially along the air conditioning pipe 21, the grating 131 is placed axially, which reduces the lateral impact of the refrigerant and thus reduces the physical disturbance of the refrigerant flow to the fiber Bragg grating sensor 12, thereby improving the accuracy of temperature monitoring. More preferably, the capillary metal tube 11 is connected to the air conditioning pipe 21 by welding. This design ensures the airtightness of the air conditioning pipe 21 and prevents refrigerant leakage. The welding process creates a seamless connection between the capillary metal tube 11 and the air conditioning pipe 21, completely isolating the risk of refrigerant leakage and avoiding system efficiency degradation or safety hazards caused by refrigerant leakage. At the same time, this welding connection is very strong and can resist external forces such as vibration of the air conditioning pipe 21 and refrigerant flow impact, preventing displacement of the capillary metal tube 11 and the monitoring section of its internal fiber Bragg grating sensor 12.

[0059] In practical applications, the specific installation process of the temperature monitoring structure 1 is as follows: First, the fiber Bragg grating sensor 12 is encapsulated using a capillary metal tube 11. To ensure that the fiber Bragg grating sensor 12 is only sensitive to temperature and not affected by external strain, it is necessary to ensure that the grating 131 is not fixed to the inner wall of the capillary metal tube 11. Then, two flanged holes are made on the surface of the air conditioning pipe 21 where the temperature needs to be monitored. The fiber Bragg grating sensor 12, which has been encapsulated using the capillary metal tube 11, is inserted into the air conditioning pipe 21 from one end and extends out from the other end, ensuring that the grating 131 of the fiber Bragg grating sensor 12 is located inside the air conditioning pipe 21. In order to minimize the impact of refrigerant flow, the grating 131 is placed along the axial direction of the air conditioning pipe 21 as much as possible. Then, the flanged holes are welded to the connection of the capillary metal tube 11 to ensure that the air conditioning pipe 21 is sealed.

[0060] Air conditioner 2 is a heat pump air conditioner, which includes air conditioning pipes 21, capillary metal tubes 11, fiber optic grating sensors 12, fiber optic demodulation devices 22, air conditioning controllers 23, data cables 24, and other components of air conditioner 2. Figure 3 The various devices are connected as shown. The fiber optic demodulation device 22 is turned on. When the internal temperature of the air conditioning pipe 21 changes, the optical signal reflected back by the fiber optic demodulation device 22 is converted into an electrical signal and transmitted to the air conditioning controller 23 through the data line 24. The air conditioning controller 23 can then make real-time feedback control based on the monitored temperature changes.

[0061] Thus, the fiber optic grating sensor 12 is embedded inside the air conditioning pipe 21 to monitor the temperature changes of the refrigerant inside the pipe in real time. Its advantages are: 1) High temperature monitoring accuracy and fast response to temperature changes. The unit can quickly respond to changes in refrigerant temperature. For example, if abnormal exhaust temperature or intake temperature is detected, the unit can be promptly controlled to take the correct action to restore the unit parameters to normal. Based on the relevant temperature parameters, the opening of the electronic expansion valve is controlled to ensure the unit's performance and reliability are at their optimal state. 2) There is no risk of explosion during the temperature monitoring process, ensuring high safety. 3) The use of an embedded sensor during temperature monitoring enables real-time monitoring of the entire temperature change process inside the air conditioning pipe 21 and real-time feedback control of the air conditioner 2 based on temperature changes.

[0062] It should be understood that a heat pump air conditioner generally includes a compressor, a four-way valve, a condenser, an economizer, and an evaporator, which are connected sequentially through air conditioning pipes to form a refrigerant circulation loop. By integrating a fiber optic sensing system with the air conditioning system, real-time monitoring of the pipe temperature throughout the entire lifecycle of the air conditioner and real-time feedback control based on temperature changes can be achieved. Specifically, when the exhaust temperature is detected to be higher than a certain value, the controller increases the opening of the electronic expansion valve. If the temperature continues to rise, the compressor frequency can be reduced. If the water temperature is already near the target water temperature, the unit will shut down directly. The controller monitors changes in defrosting, suction temperature, and economizer inlet and outlet temperatures to control the opening of the unit's electronic expansion valve, ensuring optimal unit performance. The controller also monitors the temperature difference between the inlet and outlet water to control the output power of the unit's water pump, meeting customer requirements.

[0063] The temperature monitoring structure and air conditioner proposed in this invention encapsulate a fiber Bragg grating sensor within a capillary metal tube and embed it inside the air conditioning piping to monitor real-time temperature changes of the refrigerant. This solves the problems of inaccurate temperature measurement, slow response to temperature changes, and low safety associated with traditional thermistors. Using a fiber Bragg grating sensor for temperature monitoring of the air conditioning piping offers fast response to temperature changes, high temperature monitoring accuracy, no risk of explosion during the monitoring process, and high safety. Furthermore, by integrating the fiber optic sensing system with the air conditioning system, it enables real-time monitoring of the internal temperature of the piping throughout the entire lifecycle of the air conditioner and real-time feedback control of the air conditioner based on temperature changes.

[0064] In the description of this utility model, it should be understood that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0065] Furthermore, the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0067] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0068] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An air conditioner, comprising an air conditioner controller and a compressor, a condenser, and an evaporator sequentially connected via air conditioner piping to form a refrigerant circulation loop, characterized in that, The air conditioning duct is equipped with a temperature monitoring structure, which includes a capillary metal tube and a fiber Bragg grating sensor. The fiber Bragg grating sensor, which is fitted with the capillary metal tube, extends into the air conditioning duct through a first hole on the side wall of the air conditioning duct and extends to the outside of the air conditioning duct through a second hole on the side wall of the air conditioning duct. The monitoring section of the fiber Bragg grating sensor is located inside the capillary metal tube, and the monitoring section of the fiber Bragg grating sensor has a grating located inside the air conditioning duct. There is a gap between the grating and the inner wall of the capillary metal tube, and the grating is placed along the axial direction of the air conditioning duct. The capillary metal tube is equipped with an anti-sway component at the position inside the air conditioning duct. It also includes an optical fiber demodulation device, which is connected to the fiber optic grating sensor and the air conditioner controller, respectively.

2. The air conditioner as described in claim 1, characterized in that, The capillary metal tube is connected to the air conditioning pipe by welding.

3. The air conditioner as described in claim 1, characterized in that, A sealing element is provided at the connection between the capillary metal tube and the air conditioning pipe.

4. The air conditioner as described in claim 1, characterized in that, The capillary metal tube is connected to the fiber optic grating sensor by adhesive bonding.

5. The air conditioner as described in claim 1, characterized in that, The capillary metal tube is connected to the fiber optic grating sensor by laser welding.

6. The air conditioner as described in claim 1, characterized in that, The capillary metal tube is a capillary copper tube.

7. The air conditioner as described in claim 1, characterized in that, The air conditioner is a heat pump air conditioner.

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