Novel temperature sensor suitable for air conditioner

Abstract

The utility model provides a novel temperature sensor suitable for an air conditioner, which comprises a thermistor, a connecting lead and an aluminum packaging shell, the thermistor is connected with one end of the connecting lead, the thermistor is packaged in the packaging shell, the other end of the connecting lead extends out of the packaging shell, and the other end of the connecting lead extends out of the packaging shell. And the outer surface of the packaging shell is coated with a passive film. According to the utility model, the temperature sensor packaging shell is changed from a conventional copper shell packaging mode to an aluminum shell packaging mode, the temperature sensor packaging shell adapts to a new development trend, because the heat transfer effect of the aluminum packaging shell is better, the reaction rate of the temperature sensor is improved, and the surface of the aluminum packaging shell is coated with the chromium-free passivation film, so that the corrosion resistance of the aluminum packaging shell is greatly improved, and the service life of the temperature sensor is prolonged. And the air conditioner can better adapt to the severe installation environment in the air conditioner.

Description

Technical Field

[0001] The utility model relates to the field of sensors, in particular to a novel temperature sensor suitable for air conditioners. Background Art

[0002] Air conditioners use temperature sensors to sense the ambient temperature, evaporator, compressor, and other components. These sensors are then converted into electrical signals by the control system to control system operation. As people's demands for energy conservation, environmental protection, and safety in air conditioners increase, more and more intelligent control technologies are being introduced into air conditioners, leading to an increasingly prominent role for temperature sensors in smart home appliances.

[0003] Air conditioning temperature sensors are primarily installed in indoor units, evaporator ducts, compressor exhaust ducts, and evaporator ducts. Most evaporator ducts, exhaust ducts, and evaporator ducts are copper tubes, and the corresponding duct temperature sensors are also packaged in the same copper shell. Currently, a new trend is to switch air conditioning ducts to aluminum tubes. To maintain the same material as the ducts, the temperature sensor packaging installed on the ducts has also been changed from the conventional copper shell to an aluminum shell. Although aluminum shells provide good heat transfer, they are prone to corrosion over long-term use, affecting the effectiveness of the temperature sensor.

[0004] Currently, household appliances have strict requirements on electrical insulation materials and electrical strength. Therefore, the insulation of temperature sensors must be high to avoid safety accidents caused by insulation problems of connecting wires during operation. The temperature sensors must work normally to ensure that the air-conditioning system relies on the signal feedback of the temperature sensors to work normally and achieve the expected effect of air conditioning.

[0005] Therefore, it is necessary to design an aluminum shell temperature sensor with corrosion resistance and good insulation to adapt to the harsh installation environment in the air conditioner. In addition, the temperature sensor also needs to be designed with a corresponding installation structure to facilitate installation in the air conditioning duct. Utility Model Content

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a novel temperature sensor suitable for air conditioners. The present invention at least solves some of the problems in the prior art.

[0007] The utility model is achieved in this way:

[0008] The utility model provides a novel temperature sensor suitable for air conditioners, comprising a thermistor, a connecting wire, and an aluminum packaging shell, wherein the thermistor is connected to one end of the connecting wire, the thermistor is packaged in the packaging shell, the other end of the connecting wire extends out of the packaging shell, and the outer surface of the packaging shell is covered with a passivation film.

[0009] Furthermore, the outer surface of the packaging shell is covered with a chromium-free passivation film.

[0010] Furthermore, a corrosion-resistant oxide layer is provided between the packaging shell and the chromium-free passivation film.

[0011] Furthermore, the connecting wire includes a conductive inner core and an insulating layer covering the inner core, and the thickness of the insulating layer is not less than 0.8 mm.

[0012] Furthermore, the thermistor is connected to one end of the connecting wire by welding.

[0013] Furthermore, a waterproof coating is applied to the welding point between the thermistor and the connecting wire.

[0014] Furthermore, the waterproof coating is externally wrapped with encapsulating glue.

[0015] Furthermore, the packaging shell is filled with potting glue.

[0016] Furthermore, the novel temperature sensor suitable for air conditioning also includes a connector electrically connected to an external air conditioning circuit, and the other end of the connecting wire is electrically connected to the connector.

[0017] Furthermore, the new temperature sensor suitable for air conditioning also includes a pipe clamp, which includes a first arc-shaped bend portion that fits the outer surface of the aluminum packaging shell and a second arc-shaped bend portion that fits the outer surface of the air conditioning pipe, and the first arc-shaped bend portion and the second arc-shaped bend portion are connected.

[0018] The utility model has the following beneficial effects:

[0019] 1. In the present invention, the temperature sensor package is changed from a conventional copper package to an aluminum package, which adapts to the new development trend. The aluminum package has better heat transfer effect and improves the response rate of the temperature sensor. The surface of the aluminum package is coated with a chromium-free passivation film, which greatly improves the corrosion resistance of the aluminum package and is more adaptable to the harsh installation environment in the air conditioner.

[0020] 2. The utility model thickens the insulation layer thickness of the wire, which greatly improves the insulation performance of the temperature sensor when in use, plays a good protective role during operation, and thus improves the service life and safety of the air conditioner.

[0021] 3. In the present invention, the packaging shell is equipped with a mounting pipe clamp, which facilitates the installation of the temperature sensor to the air conditioning pipe. The pipe clamp has a simple structure and is easy to install and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of a novel temperature sensor applicable to an air conditioner provided in an embodiment of the present utility model;

[0024] Figure 2 A schematic diagram of a novel temperature sensor for air conditioners provided by an embodiment of the present utility model without a pipe clamp installed;

[0025] Figure 3 This is a schematic diagram of a pipe clamp provided in an embodiment of the present utility model.

[0026] In the figure: thermistor 1, connecting wire 2, packaging shell 3, potting glue 4, connector 5, pipe clamp 6, first arc-shaped bending part 7, second arc-shaped bending part 8. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0028] like Figure 1-Figure 3 The present invention provides a novel temperature sensor suitable for air conditioners, comprising a thermistor 1, a connecting wire 2, an aluminum encapsulating shell 3, and a connector 5 electrically connected to an external air conditioner circuit. The thermistor 1 is connected to one end of the connecting wire 2, the other end of which is electrically connected to the connector 5. The thermistor 1 is encapsulated within the encapsulating shell 3, and the other end of the connecting wire 2 extends out of the encapsulating shell 3. The outer surface of the encapsulating shell 3 is covered with a chromium-free passivation film. In this embodiment, a corrosion-resistant oxide layer is provided between the encapsulating shell 3 and the chromium-free passivation film. The oxide layer can be produced by anodic oxidation. In this embodiment, the connecting wire 2 includes a conductive inner core and an insulating layer covering the inner core. The thickness of the insulating layer is 0.8 mm.

[0029] In this embodiment, the thermistor 1 is welded to one end of the connecting wire 2. A waterproof coating is applied to the weld between the thermistor 1 and the connecting wire 2. This waterproof coating is then coated with an encapsulating compound, which improves insulation and voltage resistance, extending the life of the temperature sensor. In this embodiment, the encapsulating compound 4 is filled within the encapsulating compound 3. Both the encapsulating compound and the potting compound 4 are epoxy resin.

[0030] The new temperature sensor suitable for air conditioning also includes a pipe clamp 6, which includes a first arc-shaped bent portion 7 that fits the outer surface of the aluminum packaging shell 3 and a second arc-shaped bent portion 8 that fits the outer surface of the air conditioning pipe. The first arc-shaped bent portion 7 and the second arc-shaped bent portion 8 are connected.

[0031] In the present invention, the aluminum package 3 is treated with a special passivation solution to meet the requirements of long-term salt spray testing and adapt to harsh installation environments. In this embodiment, the passivation solution uses HH-799 chromium-free passivator. HH-799 chromium-free passivator can be used for aluminum profiles and die-cast aluminum alloys. The product does not contain any heavy metals or nitrites, is completely environmentally friendly and pollution-free, and complies with national environmental protection regulations. The film formed by HH-799 chromium-free passivator can effectively ensure the adhesion between the aluminum alloy and the coating and improve the corrosion resistance of the aluminum material, and it is relatively low in cost.

[0032] After passivation with HH-799 chromium-free passivant, the aluminum enclosure 3, when bare, can withstand a salt spray test of 96-168 hours. After passivation and coating (external coating), the aluminum enclosure 3 can withstand a neutral salt spray test of 1200-1500 hours. Therefore, the chromium-free passivation film applied to the exterior of the aluminum enclosure 3 significantly improves its corrosion resistance, making it more adaptable to the harsh installation environment within air conditioners.

[0033] The outer surface of the aluminum package shell 3 is coated with a chromium-free passivation film. The specific method is: after the aluminum package shell 3 is treated with a surface conditioning agent, it is directly immersed in an 8-10% chromium-free passivation agent working solution for 8-15 minutes.

[0034] Further preferably, the aluminum packaging shell 3 is first anodized to form a corrosion-resistant oxide layer on the surface of the aluminum packaging shell 3, and then the surface is cleaned, decontaminated and smoothed with a surface conditioner, and then passivation treatment is performed. The oxide layer produced by anodization and the chromium-free passivation film can have a dual anti-corrosion effect, further improving the corrosion resistance of the temperature sensor.

[0035] In the present utility model, the connecting wire 2 adopts a customized wire with a thickened insulation layer. The thickness of the insulation layer protecting the inner core of the wire is increased to 0.8 mm. The thickness of the insulation layer is thicker than the wire products sold on the market, with better insulation and higher safety.

[0036] The thickened insulation layer can prevent the insulation layer from easily breaking and affecting the inner core of the wire. The temperature sensor will not cause safety accidents due to insulation problems of the connecting wires during operation. The temperature sensor can work normally for a long time, thereby ensuring that the air-conditioning system relies on the signal feedback of the temperature sensor to work normally.

[0037] The utility model provides an air-conditioning temperature sensor applicable to the new safety regulations, in which a thermistor 1 is welded to one end of a connecting wire 2; a waterproof coating is coated on the welding point and encapsulated with epoxy resin, and a water drop-shaped encapsulation head is formed after solidification, which is then inserted into the inner cavity of a packaging shell 3 and filled and fixed with a potting glue 4 (epoxy resin); the packaging shell 3 is made of an aluminum shell, which is consistent with the material of a new air-conditioning pipe; the aluminum packaging shell 3 is first anodized to form a corrosion-resistant oxide layer on the surface of the aluminum packaging shell 3, and then passivated and passivated again, and a chromium-free passivation film is coated on the outside of the oxide layer, which has a double anti-corrosion effect and increases the service life of the temperature sensor; a connector 5 (terminal and plastic seat) is installed at the tail end of the connecting wire 2, which is convenient for quick electrical connection with an external air-conditioning circuit and improves efficiency.

[0038] In this embodiment, the connecting wire 2 uses a 20AWG wire with an insulation layer thickness of 0.8 mm, which improves the insulation performance of the temperature sensor, prevents safety accidents caused by wire leakage, and effectively maintains the safety of the temperature sensor.

[0039] In this embodiment, the temperature sensing head made of thermistor is encapsulated in an aluminum packaging shell 3 by resin (the aluminum packaging shell has good heat transfer, is easy to process, and has low cost). The temperature sensor is installed on the air-conditioning pipe and is in direct contact with the "medium". It has a fast response time and can quickly respond to the current temperature of the surface of the air-conditioning pipe. It is sensitive and easy to install.

[0040] The utility model changes the conventional copper shell packaging form to aluminum shell packaging, adapts to the new development trend, and improves the response rate of the temperature sensor; the utility model thickens the insulation layer thickness of the wire, greatly improves the insulation performance of the temperature sensor when used, plays a good protective role during operation, and thus improves the service life and safety of the air conditioner.

[0041] The present invention also includes a pipe clamp 6, which facilitates installation of the temperature sensor on the air conditioning duct. The pipe clamp 6 includes a first curved portion 7 that conforms to the outer surface of the aluminum packaging shell 3 and a second curved portion 8 that conforms to the outer surface of the air conditioning duct. The first curved portion 7 and the second curved portion 8 are connected. In this embodiment, the aluminum packaging shell 3 is cylindrical, which facilitates dipping the passivation solution into the cylindrical aluminum packaging shell 3 and installation within the pipe clamp 6. At the same time, during the production process, the cylindrical potting jig can be used universally, making the cylindrical packaging shell 3 easy to produce and process.

[0042] In this embodiment, one end of the second arcuate bend portion 8 away from the first arcuate bend portion 7 is tilted outward, which facilitates installation and removal of the pipe clamp 6 and facilitates replacement of a new temperature sensor when necessary.

[0043] The method of using the pipe clamp 6 is as follows: first, install the aluminum packaging shell 3 of the temperature sensor to the first arc-shaped bending portion 7, and then install the pipe clamp 6 to the air conditioning pipeline.

[0044] In this embodiment, the pipe clamp 6 is made of elastic stainless steel, so that the pipe clamp 6 can be applied to air-conditioning pipes of various sizes.

[0045] The utility model provides an air-conditioning temperature sensor which has good corrosion resistance and insulation, meets the safety regulations of air-conditioning, and is suitable for new development trends.

[0046] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A new temperature sensor suitable for air conditioning, characterized by: The invention comprises a thermistor, a connecting wire and an aluminum packaging shell. The thermistor is connected to one end of the connecting wire and is packaged in the packaging shell. The other end of the connecting wire extends out of the packaging shell. The outer surface of the packaging shell is covered with a passivation film.

2. The novel temperature sensor for air conditioners according to claim 1, characterized in that: The outer surface of the packaging shell is covered with a chromium-free passivation film.

3. The novel temperature sensor for air conditioners according to claim 2, characterized in that: A corrosion-resistant oxide layer is provided between the packaging shell and the chromium-free passivation film.

4. The novel temperature sensor for air conditioners according to claim 1, characterized in that: The connecting wire includes a conductive inner core and an insulating layer covering the inner core, and the thickness of the insulating layer is not less than 0.8 mm.

5. The novel temperature sensor for air conditioners according to claim 1, characterized in that: The thermistor is connected to one end of the connecting wire by welding.

6. The novel temperature sensor for air conditioners according to claim 5, characterized in that: A waterproof coating is applied to the welding point between the thermistor and the connecting wire.

7. The novel temperature sensor for air conditioners according to claim 6, characterized in that: The waterproof coating is externally wrapped with encapsulating glue.

8. The novel temperature sensor for air conditioners according to claim 1, characterized in that: The packaging shell is filled with potting glue.

9. The novel temperature sensor for air conditioners according to claim 1, characterized in that: It also includes a connector electrically connected to an external air-conditioning circuit, and the other end of the connecting wire is electrically connected to the connector.

10. The novel temperature sensor for air conditioners according to claim 1, characterized in that: It also includes a pipe clamp, which includes a first arc-shaped bent portion that fits the outer surface of the aluminum packaging shell and a second arc-shaped bent portion that fits the outer surface of the air-conditioning pipe, and the first arc-shaped bent portion and the second arc-shaped bent portion are connected.

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