Filter element, forming process thereof, filter and refrigeration system

Abstract

The application discloses a filter core body and a forming process thereof, a filter and a refrigerating system. In the application, fluorescent particles and filter materials are pressed to form an integrated filter core body, which is then installed in the shell of the filter together, so that the fluorescent setting process is simplified, other spaces in the cavity of the filter are not occupied, and the phenomenon of missing or overloading of the fluorescent sheet in the prior art is eliminated. In the operation process of the air conditioner, the fluorescent particles can be quickly separated from the filter core body and dissolved in the refrigerating medium. After a period of operation, the refrigerating medium contains sufficient concentration of the fluorescent particles, so that the efficiency of the fluorescent particles dissolved in the refrigerating medium is greatly improved. If leakage occurs, only the welding points (suspected leakage positions) of the system need to be irradiated by using an ultraviolet lamp, and the leakage positions are identified according to the light-emitting state of the fluorescent dye, so that the detection accuracy reaches 100%, and the rapid leakage detection function is realized.

Description

Technical Field

[0001] This invention relates to the field of leakage detection technology, and in particular to a filter core and its molding process, a filter and a refrigeration system. Background Technology

[0002] Air conditioning systems use threaded connections and quick couplings in their piping, and are susceptible to vibrations during operation and wear and tear on seals, making leaks an unavoidable problem. When a decrease in cooling or heating efficiency occurs, the traditional solution is to add refrigerant to the system because leaks are difficult to locate. However, since refrigerants are colorless and odorless gases, finding leaks during routine inspections or repairs is challenging, necessitating continuous replenishment to maintain system operation. Summary of the Invention

[0003] The purpose of this invention is to provide a filter core with a simple molding process and rapid leak detection, as well as the molding process of the filter core, the filter, and the refrigeration system.

[0004] The present invention provides a filter core comprising fluorescent particles and at least one filter material, wherein the fluorescent particles and each of the filter materials are mixed in a predetermined ratio and then formed into a single unit by a pressing molding process.

[0005] In this invention, fluorescent particles and filter materials are pressed together to form a single unit, and then installed together inside the filter housing. This simplifies the fluorescent setting process, eliminates the need to occupy other space in the filter cavity, and effectively reduces the occurrence of missing or overfilled fluorescent sheets.

[0006] The present invention also provides a molding process for a filter core, the molding process comprising:

[0007] Raw material weighing process: Weigh fluorescent particles, filter material and adhesive powder, wherein the filter material includes at least one of molecular sieve, alumina and activated carbon;

[0008] Stirring and mixing: Stir and mix the fluorescent particles, filter material and adhesive powder so that the fluorescent particles and adhesive powder adhere to the surface of the filter material;

[0009] Compression molding process: The mixed materials are poured into a mold, heated and pressed into a block structure.

[0010] The present invention also provides a filter comprising a housing having a cavity, the housing having a first port and a second port communicating through the cavity, and a filter element as described in any of the preceding claims positioned in the cavity.

[0011] Finally, the present invention also provides a refrigeration system including a compressor, a condenser and an evaporator, and further including the filter described in any of the preceding claims.

[0012] The filter core molding process provided by this invention is for molding the above-mentioned filter core. Both the filter and the refrigeration system have the above-mentioned filter core, so the filter core molding process, the filter and the refrigeration system all have the technical effects of the above-mentioned filter core. Attached Figure Description

[0013] Figure 1 This is a diagram illustrating the luminescence principle of fluorescent materials.

[0014] Figure 2 This is a schematic diagram of the filter structure in one embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of the structure of the filter core in one embodiment of the present invention;

[0016] Figure 4 This is a flowchart illustrating the molding process of the filter core in one embodiment of the present invention. Detailed Implementation

[0017] Currently, fluorescent agent leak detection is commonly used in automotive air conditioning systems. There are two main methods: First, the fluorescent agent powder is transferred into a permeable bag, sealed, and then the bag is placed inside the drying component of the system. Second, a certain amount of fluorescent dye for leak detection is implanted onto a carrier (such as felt) of a specific size. The fluorescent agent raw material is dissolved in organic solvents such as toluene, xylene, cyclohexane, and dichloromethane. The carrier material is then immersed in the mixed solution, and after complete absorption, it is dried to form a sheet-like fluorescent agent. During assembly, the sheet-like fluorescent agent and filter material are placed together inside the drying component.

[0018] As the refrigerant circulates in the system, the fluorescent dye will dissolve throughout the system. Then, when irradiated with a UV lamp of a certain wavelength, the fluorescent dye at the leak point will emit its fluorescent color, achieving rapid and effective leak detection.

[0019] The above two methods have the following drawbacks:

[0020] 1. Adding fluorescent agents requires an additional sealing process, which is complicated;

[0021] 2. The sheet-like fluorescent agent carrier is preserved intact in the air conditioning system, is not easily dissolved, and also needs to occupy a certain volume;

[0022] 3. During the operation of the air conditioner, the refrigerant washes over the sheet-like fluorescent agent carrier, and the fluorescent agent is released from the carrier and dissolved in the refrigerant. The entire system has a long operating cycle.

[0023] 4. There are cases of missing or overfilled fluorescent agent carriers.

[0024] Based on the above findings, this application has conducted in-depth research and proposed a technical solution that can solve at least one of the above defects.

[0025] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Please refer to Figures 2 to 4 , Figure 2 This is a schematic diagram of the filter structure in one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the filter core in one embodiment of the present invention; Figure 4 This is a flowchart illustrating the molding process of the filter core in one embodiment of the present invention. Figure 2 The middle arrow indicates the direction of refrigerant flow.

[0027] This invention provides a refrigeration system including a compressor, a condenser, an evaporator, and a filter. The compressor, condenser, evaporator, and filter form a refrigerant circulation loop through piping, and the refrigerant can be selected according to environmental requirements. The specific structures of the compressor, condenser, and evaporator are not described in detail herein; please refer to current technology.

[0028] The filter of this invention includes a filter core 1, which comprises fluorescent particles 12 and at least one filter material 11. The filter material 11 includes at least one of molecular sieve, alumina, and activated carbon. The main function of the filter material 11 is to filter impurities in the refrigerant medium flowing through it and to absorb moisture from the refrigerant medium.

[0029] Among them, fluorescent particles 12 include at least one of dinoflagellates, naphthalenedicarboximide, coumarin and anthracene; after being irradiated with ultraviolet light of a certain wavelength, this type of compound absorbs light energy and enters an excited state, and immediately de-excites and emits outgoing light (i.e. fluorescence) with a longer wavelength than the incident light. Once the incident light is stopped, the luminescence phenomenon also disappears immediately.

[0030] Please refer to Figure 1 When ultraviolet light irradiates the above compounds, the energy of the light causes some electrons around the atomic nucleus to jump from their original orbits to higher energy orbits, that is, from the ground state S0 to the first excited singlet state S1 or the second excited singlet state S2, etc. The first excited singlet state S1 or the second excited singlet state S2 is unstable, so it will revert to the ground state S0. When the electrons return from the first excited singlet state S1 to the ground state S0, the energy is released in the form of light, thus producing fluorescence F.

[0031] In this invention, the fluorescent particles 12 and each filter material 11 are mixed in a predetermined ratio and then formed into a single unit through a pressing process. The predetermined ratio of the fluorescent particles 12 and each filter material 11 can be determined according to the specific application environment. The fact that the numerical value of the predetermined ratio is not disclosed herein does not affect the understanding and implementation of the technical solution by those skilled in the art.

[0032] In this invention, fluorescent particles 12 and filter material 11 are integrally formed by pressing and then installed together inside the filter housing. This simplifies the fluorescence setting process, eliminates the need to occupy other space in the filter cavity, and eliminates the problem of missing or over-installing fluorescent sheets found in existing technologies. During air conditioning operation, fluorescent particles 12 can quickly precipitate from the filter core 1 and dissolve in the refrigerant medium. After a period of operation, the refrigerant medium contains a sufficient concentration of fluorescent particles 12, greatly improving the efficiency of the fluorescent particles 12 dissolving in the refrigerant medium. If a leak occurs, only the welded joints (suspected leak points) of the system need to be irradiated with an ultraviolet lamp, and the leak point can be identified based on the luminescence state of the fluorescent dye. The detection accuracy reaches 100%, achieving rapid leak detection.

[0033] The filter core 1 of this invention also includes an adhesive powder. Before the pressing process, the fluorescent particles 12, each filter material 11, and the adhesive powder are mixed evenly. The fluorescent particles 12 and each filter material 11 are bonded together by heating with the adhesive. The bonded fluorescent particles 12 and filter materials 11 are then pressed into shape. The thermosetting temperature of the adhesive is lower than the temperature resistance of the fluorescent particles 12. The adhesive binds the fluorescent particles 12 and the filter materials 11, which helps to improve the reliability of their bonding. The adhesive can be phenolic epoxy powder.

[0034] Similarly, the proportions of fluorescent particles 12, various filter materials 11, and adhesive powder components depend on the specific circumstances.

[0035] The present invention also provides a specific method for molding the filter core 1, which specifically includes:

[0036] S1. Raw material weighing process: Calculate the required weight of fluorescent agent according to the amount of refrigerant charged into the refrigeration system, and weigh the filter material 11, including at least one of molecular sieve, alumina, and activated carbon, fluorescent particles 12, and adhesive powder according to the predetermined ratio; each component can be weighed by a weighing machine.

[0037] S2. Stirring and mixing: Stir and mix the weighed fluorescent particles 12, filter material 11 and adhesive powder so that the fluorescent particles 12 and adhesive powder adhere to the surface of the filter material 11; mix the weighed components. The mixing can be carried out in a stirrer. The stirring time can be selected arbitrarily. For example, in a specific example, the stirring time can be 15 min to 20 min, as long as the adhesive powder and fluorescent particles 12 can be uniformly adhered to the surface of each filter material 11.

[0038] S3, Pressing and Molding Process: The mixed material is poured into a mold and heated and pressed into a block structure; specifically, after mixing, the material is poured into the weighing machine again, the model is processed according to the size of filter core 1, the weight of the weighing machine is set, and the material is poured into the mold after each weighing, heated and pressed into shape. The pressing temperature range of the pressing and molding process is 160℃-200℃, and the time is 50s-120s.

[0039] S4. Sintering process: Sintering is carried out in an oven or drying tunnel at a temperature of 160℃-200℃ for 60min-90min; this can enhance the compressive strength of the filter core 1.

[0040] S5. Cooling process: vacuum cooling or natural cooling, with ambient humidity less than or equal to 50% during natural cooling.

[0041] Based on the filter core 1 described above, the present invention also provides a filter, including a housing with a cavity, the housing having a first port and a second port communicating through the cavity, and a filter core 1 of any of the above embodiments positioned in the cavity.

[0042] The cavity of the filter also includes a first filter element 5, a first baffle 3, a second filter element 6, and a second baffle 4. The first filter element 5 and the first baffle 3 are located at one end of the filter core 1, and the second filter element 6 and the second baffle 4 are located at the other end of the filter core 1. The first baffle 3 and the second baffle 4 can be fixed by the baffle positioning member 10.

[0043] The filter can be a one-way drying filter or a two-way drying filter, and the filter element 1 can be fixed inside the housing by a positioning component.

[0044] Specifically, the shell includes a cylindrical body 2, a first end cap 6, and a second end cap 7. The first end cap 6 and the second end cap 7 are respectively welded to the openings at both ends of the cylindrical body 2. The first opening 8 and the second opening 9 are respectively located at the first end cap 6 and the second end cap 7. The cylindrical body 2, the first end cap 6, and the second end cap 7 enclose and form a cavity.

[0045] The processing flow of the one-way dryer filter includes: welding the cylinder to the first end cover, assembling the filter core 1, assembling the positioning parts for fixing the filter core 1, welding the cylinder to the second end cover, leak testing, painting, and finished product packaging.

[0046] The processing flow of the two-way drying filter includes: assembling the one-way valve component, welding the cylinder to the first end cover, assembling the filter core 1, assembling the positioning component to fix the filter core 1, assembling the one-way valve component, welding the cylinder to the second end cover, leak testing, painting, and finished product packaging.

[0047] The filter core 1, its molding process, filter, and refrigeration system provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A filter element, characterized in that, The device includes fluorescent particles and at least one filter material. The fluorescent particles and each of the filter materials are mixed in a predetermined ratio and then formed into a single unit through a pressing process. It also includes an adhesive powder. Before pressing, the fluorescent particles, each of the filter materials, and the adhesive powder are mixed evenly. The fluorescent particles are adhered to the surface of each of the filter materials by the adhesive powder. The bonded fluorescent particles and filter materials are then pressed into a block structure.

2. The filter core as described in claim 1, characterized in that, The pressing temperature range of the pressing molding process is 160℃-200℃, and the time is 50s-120s. Alternatively / and, after the pressing process, a sintering process is also performed: sintering is carried out in an oven or drying tunnel at a temperature of 160℃-200℃ for a time of 60min-90min.

3. The filter core as described in claim 2, characterized in that, The sintering process is followed by a cooling process, which specifically includes vacuum cooling or natural cooling, wherein the ambient humidity is less than or equal to 50% during natural cooling.

4. The filter core as described in claim 1, characterized in that, The fluorescent particles include at least one of dinoflagellates, naphthalenedicarboximide, coumarin, and anthracene; Or / and, the filter material includes at least one of molecular sieve, alumina and activated carbon; Alternatively and / or, the adhesive powder includes phenolic epoxy resin powder.

5. A molding process for a filter core, used for molding the filter core according to any one of claims 1 to 4, characterized in that, The molding process includes: Raw material weighing process: Weigh fluorescent particles, filter material and adhesive powder, wherein the filter material includes at least one of molecular sieve, alumina and activated carbon; Stirring and mixing: Stir and mix the fluorescent particles, filter material and adhesive powder so that the fluorescent particles and adhesive powder adhere to the surface of the filter material; Compression molding process: The mixed materials are poured into a mold, heated and pressed into a block structure.

6. The molding process of the filter core as described in claim 5, characterized in that, The compression molding process is followed by: Sintering process: Sintering is carried out in an oven or drying tunnel at a temperature of 160℃-200℃ for 60min-90min. Cooling process: vacuum cooling or natural cooling, with ambient humidity less than or equal to 50% during natural cooling.

7. A filter, characterized in that, The device includes a housing having a cavity, the housing having a first port and a second port communicating through the cavity, and a filter core according to any one of claims 1 to 4 positioned in the cavity.

8. The filter as claimed in claim 7, characterized in that, The housing includes a cylindrical body, a first end cap, and a second end cap. The first end cap and the second end cap are respectively welded to the openings at both ends of the cylindrical body. The first opening and the second opening are respectively located at the first end cap and the second end cap. The cylindrical body, the first end cap, and the second end cap together form the cavity.

9. The filter as claimed in claim 7, characterized in that, The filter is a one-way drying filter, or the filter is a two-way drying filter.

10. A refrigeration system comprising a compressor, a condenser, and an evaporator, characterized in that, It also includes the filter as described in any one of claims 7 to 9.

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