A visual liquid mirror assembly for an engineering machine air conditioning

Abstract

The utility model discloses a kind of visual liquid sight glass assemblies of engineering machinery air conditioning, applicable to engineering machinery air conditioning system, especially applicable to high vibration, high dust, high temperature operating environment such as loader.The device installs liquid sight glass in the refrigerant pipe section of drier export side, and realizes the direct observation of refrigerant flow state through transparent observation window formed by double-layer toughened glass, and inner layer glass is covered with fluorinated anticorrosive coating, with good pressure resistance, corrosion resistance.Liquid sight glass adopts 45 degrees inclination full welding installation structure with pipeline axis, and sets up O-ring seal, ensure the stability and sealing property of device in harsh environment.Maintenance personnel can monitor refrigerant bubble change in real time through liquid sight glass, auxiliary judge whether refrigerant charging is saturated and whether system operation exists leakage or blockage fault, significantly improve the maintenance efficiency and safety of air conditioning system.The device has simple structure, low manufacturing cost, strong adaptability, and has good popularization and application value.

Description

Technical Field

[0001] This utility model relates to the monitoring and maintenance technology of air conditioning systems and refrigeration equipment for construction machinery, and in particular to a visual liquid sight device integrated into the refrigerant pipeline, used for refrigerant charging, operation status observation and fault diagnosis of air conditioning systems for construction machinery such as loaders and excavators. Background Technology

[0002] As construction machinery gradually develops towards higher efficiency and intelligence, the comfort and safety requirements for air conditioning systems in large construction machinery such as loaders and excavators are increasing. Traditional construction machinery air conditioning systems often install sight glasses (such as...) on the top or side wall of the liquid storage tank. Figure 1 As shown in the diagram, the refrigerant level is determined manually by visual inspection. However, this layout and method have the following main drawbacks:

[0003] (1) Limited field of vision. The storage tank is usually located at the height of the machine or in a complex pipeline layout. Operators need to climb or remove protective parts to view it, which is inefficient and poses a safety hazard.

[0004] (2) Vibration interference. Construction machinery operates in vibration and impact environments such as mines and construction sites for a long time. The walls of the liquid storage tank are thin and the connection between the liquid sight glass and the tank body is mostly threaded or plugged. Vibration can easily cause the seal to loosen, the glass to become blurred or break, affecting the observation effect and the safety of use.

[0005] (3) Limited observation information. Traditional sight glasses can only display the liquid level and cannot provide key information such as the refrigerant flow status in the pipeline and the generation and disappearance of bubbles. It is difficult to accurately determine whether the refrigerant is sufficient or whether there are problems such as air blockage or leakage. This can easily lead to over- or under-charging, reduce system efficiency and increase energy consumption.

[0006] (4) Delayed fault diagnosis. The lack of real-time flow monitoring function makes it difficult to detect faults such as refrigerant leakage, blockage or air lock in time, which delays maintenance or causes further damage to the system;

[0007] Some publicly available technologies, such as US5,333,469, propose an electronic bubble sensor solution for pipelines, which can detect bubbles and trigger alarms. However, this solution relies on electronic components, is costly, and lacks reliability under high vibration, high dust, and high temperature conditions. Other patents, such as CN 201010123456.X, involve pipeline insertion sight glass structures, but their core remains a simple relocation of mechanical structures, without considering issues such as corrosion prevention, vibration damping, and viewing angle optimization. Therefore, providing a pipeline integrated liquid sight glass that is simple in structure, cost-effective, adaptable to harsh environments, and allows for direct observation of refrigerant flow and bubble status has significant practical value and industrial application implications. Utility Model Content

[0008] To overcome the above-mentioned technical defects, the purpose of this utility model is to provide a visual liquid sight glass device integrated into the refrigerant pipeline system. By setting a pressure-resistant and corrosion-resistant observation window on the outlet side of the dryer pipe section and adopting an inclined installation and sealing structure, the device can realize real-time monitoring and fault early warning of the refrigerant flow status in the pipeline.

[0009] To solve the above-mentioned technical problems, this utility model provides a visual liquid sight glass assembly for air conditioning of engineering machinery, wherein the liquid sight glass assembly is integrated into the refrigerant pipeline, specifically including:

[0010] A section of refrigerant pipe is installed on the outlet side of the dryer;

[0011] A sight glass structure fixedly installed on the refrigerant pipe section, the sight glass structure comprising:

[0012] A transparent observation window, wherein the transparent observation window is a double-layered tempered glass structure;

[0013] The inner surface of the transparent observation window is provided with a fluorinated corrosion-resistant coating;

[0014] The liquid sight glass structure is fixedly connected to the refrigerant pipe section by circumferential full welding, and the installation angle is 45° with the horizontal pipe axis.

[0015] The sight glass structure is internally sealed with an O-ring to ensure refrigerant sealing reliability and operational safety under high-pressure conditions; wherein...

[0016] The liquid sight glass structure is used to visually observe the internal flow state of the refrigerant during the refrigerant charging process, in order to help determine whether the refrigerant charge has reached saturation, or to determine whether there are any faults such as leaks or blockages in the refrigerant system during operation.

[0017] Optionally, the compressive strength of the double-layer tempered glass structure is not less than 3.5 MPa.

[0018] Optionally, the transparent observation window is fitted into a pre-reserved groove welded to the flange face of the refrigerant pipe section to enhance welding strength and installation stability.

[0019] Optionally, the fluorinated coating is a multilayer film structure, possessing resistance to refrigerant corrosion, oil mist adhesion, and high-temperature aging.

[0020] Optionally, the O-ring sealing structure is disposed in the groove between the sight glass and the support structure, and the sealing material is fluororubber.

[0021] Optionally, the sight glass assists in judging the charging status by the change in the state of bubbles during the refrigerant charging process. When the continuous bubbles in the sight glass gradually decrease until they disappear, it indicates that the refrigerant charging is close to saturation.

[0022] Optionally, the component is installed in the air conditioning system of the construction machinery loader and is adapted to working conditions such as high-frequency vibration, high temperature and high dust, which enhances structural stability and ease of maintenance.

[0023] Optionally, the overall structure of the liquid sight glass assembly has been verified by vibration tests and refrigerant pressure tests, demonstrating its reliability and durability under long-term high-load conditions.

[0024] The beneficial effects of this utility model's technical solution are:

[0025] This utility model's visual liquid sight glass assembly has a compact structure, controllable cost, and convenient installation. It can provide intuitive monitoring of refrigerant flow and bubbles under high vibration, high dust, high temperature, and high pressure conditions, significantly improving the charging accuracy and fault diagnosis efficiency of air conditioning systems. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a pipeline sight glass in the prior art;

[0027] Figure 2 This is a schematic diagram of the structure of the visual liquid sight glass assembly for air conditioning of engineering machinery in this embodiment of the present invention;

[0028] Figure 3 for Figure 2 Enlarged view of the liquid level sight glass assembly;

[0029] Figure 4 This is a partial cross-sectional view of the liquid sight mirror assembly in an embodiment of this utility model. Detailed implementation method:

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] 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.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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; and they can refer to the internal connection of 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.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] Please see Figure 2 , Figure 3 and Figure 4 The illustration shows a visual liquid sight glass assembly for an air conditioner in engineering machinery, wherein the liquid sight glass assembly 100 is integrated into a refrigerant pipeline 1, specifically including a refrigerant pipeline section 1 located at the outlet side of the dryer; a liquid sight glass structure 2 fixedly mounted on the refrigerant pipeline section 1, the liquid sight glass structure 2 including: a transparent observation window 21, the transparent observation window 21 being a double-layer tempered glass structure; the inner surface of the transparent observation window 21 being provided with a fluorinated corrosion-resistant coating; the liquid sight glass structure and the refrigerant pipeline section are fixedly connected by circumferential full welding, and the installation angle is 45° with the horizontal pipeline axis (e.g., ...). Figure 3 (As shown); The liquid sight glass structure is equipped with an O-ring 22 seal to ensure the reliability of refrigerant sealing and the safety of use under high pressure conditions; The liquid sight glass structure is used to visually observe the internal flow state of the refrigerant during the refrigerant charging process, so as to help determine whether the refrigerant charge has reached saturation, or to determine whether there are leaks, blockages or other faults in the refrigerant system during operation.

[0036] In this embodiment, the compressive strength of the double-layer tempered glass structure is not less than 3.5 MPa.

[0037] In this embodiment, the transparent observation window 21 is fitted with the pre-reserved groove welded to the flange face of the refrigerant pipe section 1 to enhance the welding strength and installation stability.

[0038] In this embodiment, the fluorinated coating is a multilayer film structure, which has the properties of resisting refrigerant corrosion, resisting oil mist adhesion and resisting high temperature aging.

[0039] In this embodiment, the O-ring 22 sealing structure is disposed in the groove between the liquid sight glass observation window and the support structure, and the sealing material is fluororubber.

[0040] In this embodiment, the sight glass assists in judging the charging status by the change in the state of bubbles during the refrigerant charging process. When the continuous bubbles in the sight glass gradually decrease until they disappear, it indicates that the refrigerant charging is close to saturation.

[0041] In this embodiment, the component is installed in the air conditioning system of the construction machinery loader and is adapted to working conditions such as high-frequency vibration, high temperature and high dust, which enhances structural stability and ease of maintenance.

[0042] In this embodiment, the overall structure of the liquid sight glass assembly has been verified by vibration test and refrigerant pressure test, and has the reliability and durability under long-term high load conditions.

[0043] The following description will further illustrate the characteristics and functions of this utility model.

[0044] like Figure 2 As shown, in this embodiment, an installation hole is made at the refrigerant pipeline section on the dryer outlet side of the loader's air conditioning system. The hole diameter matches the outer diameter of the sight glass support body. The sight glass support body is inserted into the hole and securely connected to the pipeline by circumferential full welding. The weld height is 4mm and the width is 3mm, ensuring reliability under vibration frequencies of 10Hz to 500Hz. The support body C forms a 45° angle with the pipeline axis, facilitating observation by personnel standing.

[0045] The liquid crystal sight glass observation window consists of two tempered glass panes, each 3mm thick, manufactured using a high-temperature quenching process. The inner glass layer is coated with a fluoropolymer coating approximately 10μm thick to enhance corrosion resistance. A 1mm gap is left between the two glass panes, sealed with a fluororubber O-ring. The O-ring has a cross-sectional diameter of 2.4mm and is made of oil-resistant and high-temperature-resistant fluororubber. After a 3.5MPa pressure test, no leakage was observed within the sealed cavity.

[0046] When charging the system with refrigerant R134a, after opening the charging valve, the movement of air bubbles inside the pipe can be clearly observed through the sight glass. As the charging volume increases, the number of air bubbles gradually decreases. When no air bubbles are observed, it indicates that the refrigerant is close to saturation, and charging can be stopped. At this point, perform a vacuum evacuation and sealing test again to complete system maintenance.

[0047] An external dust cover is also added to prevent mud, dust, and stone chips from entering the observation window area. The dust cover F is made of high-temperature resistant engineering plastic and has an open design for easy disassembly and cleaning during maintenance.

[0048] To further prevent glass from shattering and scattering under high pressure, a transparent explosion-proof film can be pasted onto the outer layer of double-layer tempered glass. The explosion-proof film is about 0.2mm thick and has a tensile strength of more than 20MPa. It can effectively bind broken glass fragments inside the film, ensuring personnel safety.

[0049] The support body has a reserved temperature sensor interface on its side wall. The interface type is a standard thermocouple socket, which can be inserted into a thermocouple probe to collect refrigerant temperature data in real time. The data is then displayed and stored through an external data acquisition module to provide temperature reference for on-site maintenance personnel.

[0050] In summary, the present invention's visual liquid sight glass assembly has a compact structure, controllable cost, and convenient installation. It can provide intuitive monitoring of refrigerant flow and bubbles under high vibration, high dust, high temperature, and high pressure conditions, significantly improving the charging accuracy and fault diagnosis efficiency of air conditioning systems.

[0051] The sight glass structure in this embodiment allows observation to be performed without climbing or disassembling protective components, improving maintenance efficiency by more than 30%. The combination of double-layer tempered glass and fluorinated coating provides pressure resistance ≥3.5MPa, corrosion resistance, and high temperature resistance. The circumferential full welding and O-ring seal significantly enhance vibration resistance.

[0052] The liquid sight glass structure of this embodiment can observe the refrigerant bubble state in real time, achieve accurate filling judgment (error ≤ 5%), and detect faults such as leakage and blockage early. It can also be equipped with dust cover, explosion-proof membrane and temperature sensing interface to meet the needs of different working conditions and has good engineering promotion value. Compared with electronic sensing solutions, it has a simple structure, low manufacturing cost, and is easy to mass-produce and maintain.

[0053] This utility model has significant innovation and practicality in the field of air conditioning systems for engineering machinery. Its technical solution is reasonable, its process is feasible, and it has broad application prospects.

[0054] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A visual liquid sight assembly for air conditioning in engineering machinery, characterized in that, The liquid sight glass assembly is integrated into the refrigerant piping, specifically including: A section of refrigerant pipe is installed on the outlet side of the dryer; A sight glass structure fixedly installed on the refrigerant pipe section, the sight glass structure comprising: A transparent observation window, wherein the transparent observation window is a double-layered tempered glass structure; The inner surface of the transparent observation window is provided with a fluorinated corrosion-resistant coating; The liquid sight glass structure is fixedly connected to the refrigerant pipe section by circumferential full welding, and the installation angle is 45° with the horizontal pipe axis. The sight glass structure is internally sealed with an O-ring to ensure refrigerant sealing reliability and operational safety under high-pressure conditions; wherein... The liquid sight glass structure is used to visually observe the internal flow state of the refrigerant during the refrigerant charging process, in order to help determine whether the refrigerant charge has reached saturation, or to determine whether there are leaks or blockages in the refrigerant system during operation.

2. The liquid sight mirror assembly according to claim 1, characterized in that, The compressive strength of the double-layer tempered glass structure is not less than 3.5 MPa.

3. The liquid sight mirror assembly according to claim 1, characterized in that, The transparent observation window is fitted into the pre-reserved groove welded to the flange face of the refrigerant pipe section, thereby enhancing the welding strength and installation stability.

4. The liquid sight mirror assembly according to claim 1, characterized in that, The fluorinated corrosion-resistant coating has a multi-layer film structure and possesses resistance to refrigerant corrosion, oil mist adhesion, and high-temperature aging.

5. The liquid sight mirror assembly according to claim 1, characterized in that, The O-ring sealing structure is located in the groove between the sight glass and the support structure, and the sealing material is fluororubber.

6. The liquid sight mirror assembly according to claim 1, characterized in that, The sight glass assists in judging the charging status by the change in the state of bubbles during the refrigerant charging process. When the continuous bubbles in the sight glass gradually decrease until they disappear, it indicates that the refrigerant charging is close to saturation.

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