Integrated variable diameter capillary filter fittings

Abstract

This utility model discloses an integrated variable diameter capillary filter fitting, which integrates the filter and capillary into one unit. The core of the filter is a cylindrical filter element set inside, with a conical structure at the bottom. The filter filters impurities through the filter cylinder. Compared with the existing planar structure of filter discs, this structure provides a larger filtration surface area, thereby reducing the flow rate and filtration resistance per unit area, improving filtration efficiency and service life. In addition, the conical structure at the bottom of the filter cylinder makes it easier for impurities to gather at the tip of the cone when the liquid flows, rather than spreading flat on the surface of the filter media, which helps to delay filter pore clogging.

Description

Technical Field

[0001] This utility model relates to the field of capillary technology, specifically to an integrated variable diameter capillary filter fitting. Background Technology

[0002] In air conditioning systems, the stable flow and cleanliness of the refrigerant are crucial for ensuring efficient and reliable operation. Among these components, filters and capillary tubes are two particularly important, each performing different functions within the system piping:

[0003] Among them, the capillary tube is a long tube with a small and fixed inner diameter, which is installed between the condenser and the evaporator as a throttling element. Its core functions are twofold: first, to throttle and reduce the pressure of the high-temperature and high-pressure liquid refrigerant, so that it becomes a low-temperature and low-pressure gas-liquid mixture; second, to use the fixed diameter and length of the tube to precisely control the flow rate of refrigerant entering the evaporator in order to match the design load of the system.

[0004] In addition, during the process of refrigerant flowing through the compressor, pipeline and heat exchanger, solid impurities such as metal shavings and welding oxides are inevitably generated. If these impurities enter the downstream with the refrigerant, they can easily clog the capillary tube with a very fine inner diameter, leading to a decrease in the cooling effect of the system or even complete failure. Therefore, the filter is usually installed before the capillary tube. Its core function is to filter out solid particles in the refrigerant to ensure the smooth flow and safety of the capillary tube and the entire system.

[0005] In existing technologies, filters used to protect capillary tubes generally employ a planar filter element (or screen) structure. This structure simply supports a circular metal screen or other porous filter material in the flow channel, as disclosed in patent announcement CN204176982U regarding the capillary tube and filter assembly with it. Although the structure is simple, this planar filter element structure has obvious drawbacks. Because it is a planar structure, its effective filtration area is limited to the projected area of ​​the filter element itself. When fluid passes through, all impurities are concentrated on this limited plane, causing impurities to accumulate rapidly and the filter pores to be easily clogged. This not only rapidly increases the resistance to fluid flow, resulting in increased system pressure drop and reduced energy efficiency, but also greatly shortens the effective service life of the filter, requiring frequent maintenance or replacement. Utility Model Content

[0006] In view of the above-mentioned shortcomings in the existing technology, the purpose of this utility model is to provide an integrated variable diameter capillary filter fitting with better filtration effect.

[0007] The technical solution adopted by this utility model to achieve the above objectives is: an integrated variable diameter capillary filter fitting, including a filter and a capillary tube fixed integrally with the filter. The filter includes an outer cylinder, a filter cylinder, and an end cylinder. The capillary tube is fixedly connected to the bottom end of the outer cylinder. A support platform is fixedly connected inside the outer cylinder. The filter cylinder is provided on the support platform. The top end of the filter cylinder is provided with a liquid inlet. A liquid outlet cavity is provided between the filter cylinder and the inner wall of the outer cylinder. The end cylinder is fixedly connected to the outer cylinder. The end cylinder presses the filter cylinder down onto the support platform.

[0008] In the above technical solution, the filter cartridge includes a mounting ring and a filter element fixedly connected to the mounting ring, and the end cylinder presses the mounting ring down onto the support platform.

[0009] In the above technical solution, the bottom end of the filter element adopts a conical structure.

[0010] In the above technical solution, a first sealing ring is provided between the support platform and the mounting ring.

[0011] In the above technical solution, the end cylinder includes a main body and an installation part that is integral with the main body. The installation part is fitted into the outer cylinder and presses down the installation ring. The main body is provided with a liquid inlet connection port.

[0012] In the above technical solution, a second sealing ring is provided between the mounting part and the mounting ring.

[0013] In the above technical solution, the mounting part and the outer cylinder are fixedly connected by a threaded connection.

[0014] In the above technical solution, the connection between the main body and the outer cylinder is fixedly connected by welding.

[0015] In the above technical solution, the outer cylinder includes an annular main cylinder and a conical bottom cylinder integrally formed with the annular main cylinder. A liquid outlet pipe is fixedly connected to the bottom of the conical bottom cylinder, and a capillary tube is integrally connected to the liquid outlet pipe. The support platform is fixedly connected inside the annular main cylinder.

[0016] In the above technical solution, the filter element is a stainless steel filter element.

[0017] The beneficial effects of this utility model are as follows: The filter filters impurities through the filter cylinder. Compared with the existing planar structure of filter discs, this structure provides a larger filtration surface area, thereby reducing the flow rate and filtration resistance per unit area, improving filtration efficiency and service life. In addition, the bottom of the filter cylinder adopts a conical structure, so when the liquid flows, impurities are more likely to gather at the tip of the cone rather than spread flat on the surface of the filter material, which helps to delay the clogging of the filter pores. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the filter structure in this utility model;

[0020] Figure 3 for Figure 2 Detailed structural diagram of part a;

[0021] Figure 4 This is a schematic diagram of the structure when the middle end cylinder of this utility model is separated.

[0022] In the diagram: 100 Filter, 101 Outer cylinder, 1011 Annular main cylinder, 1012 Conical bottom cylinder, 1013 Liquid outlet pipe, 102 Filter cylinder, 1021 Mounting ring, 1022 Filter element, 1023 Liquid inlet, 103 End cylinder, 1031 Main body, 1032 Mounting part, 104 Support platform, 105 First sealing ring, 106 Second sealing ring;

[0023] 200 capillary tubes. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] Please see Figures 1-4 The integrated variable diameter capillary filter fitting provided by this utility model is mainly used in air conditioning refrigeration systems. It is installed between the condenser and the evaporator and plays a dual role in filtering impurities and throttling and reducing pressure. The integrated variable diameter capillary 200 filter 100 fitting is mainly composed of two parts: filter 100 and capillary 200. The capillary 200 and the bottom outlet of filter 100 are fixedly connected by coaxial integral molding, thereby eliminating the leakage risk that may exist in the traditional split connection and making the structure more compact.

[0026] The filter 100 mainly includes an outer cylinder 101, a filter cylinder 102, and an end cylinder 103. The outer cylinder 101 forms the main outer shell of the filter 100, and its bottom end is connected to the capillary tube 200. An annular support platform 104 is fixedly connected inside the outer cylinder 101, which is used to support the filter cylinder 102 inside.

[0027] In a preferred embodiment, the outer cylinder 101 consists of two parts: an annular main cylinder 1011 at the top and a conical bottom cylinder 1012 at the bottom. The support platform 104 is fixedly connected inside the annular main cylinder 1011. The bottom end of the conical bottom cylinder 1012 is fixedly connected to a liquid outlet pipe 1013. The liquid outlet pipe 1013 is fixedly connected to the capillary tube 200 in an integral structure. The design of the conical bottom cylinder 1012 helps to guide the fluid to converge towards the central liquid outlet pipe 1013.

[0028] The filter cartridge 102 is the core component that performs the filtration function. It is located inside the outer cylinder 101 and sits on the support platform 104. Specifically, the filter cartridge 102 includes a mounting ring 1021 and a cylindrical filter element 1022 fixedly connected to the mounting ring 1021. The filter element 1022 is preferably made of stainless steel, which has good corrosion resistance and mechanical strength. Its structure is that it has a liquid inlet 1023 at the top and is closed at the bottom. Compared with the existing planar structure of filter plates, this structure provides a larger filtration surface area, thereby reducing filtration resistance and improving filtration efficiency and service life.

[0029] In a preferred embodiment, the bottom of the filter element 1022 adopts a conical structure. This conical bottom design makes it easier for the impurities intercepted by the liquid to slide and collect towards the tip of the cone under the action of gravity when the liquid passes through the cylinder wall, rather than being evenly spread across the entire filter surface. This effectively slows down the clogging speed of the filter holes and significantly improves the dirt holding capacity and service life.

[0030] Furthermore, the end cylinder 103 is fixedly connected to the top opening of the outer cylinder 101. The end cylinder 103 includes a main body 1031 and a mounting part 1032 integrally formed with the main body 1031. The mounting part 1032 extends into the interior of the outer cylinder 101 and directly presses down on the mounting ring 1021 of the filter cylinder 102, so that it is tightly fixed on the support platform 104, ensuring the stability of the filter cylinder 102 during operation.

[0031] To ensure the sealing of each connection, a first sealing ring 105 is provided between the contact surface of the support platform 104 and the mounting ring 1021, and a second sealing ring 106 is provided between the contact surface of the mounting part 1032 and the mounting ring 1021. The main body 1031 of the end cylinder 103 is provided with a liquid inlet for connecting to the upstream refrigerant pipeline.

[0032] Regarding the fixing method between the end cylinder 103 and the outer cylinder 101, this utility model provides several feasible solutions:

[0033] In one embodiment, the mounting portion 1032 of the end cylinder 103 and the inner wall of the outer cylinder 101 can be fixed by a threaded connection, which facilitates installation and maintenance.

[0034] In another embodiment that seeks higher connection strength and sealing performance, the main body 1031 of the end cylinder 103 and the top end port of the outer cylinder 101 can be permanently fixed by welding to form an integral structure that cannot be disassembled, thus completely eliminating the risk of leakage at that location.

[0035] The integrated variable diameter capillary filter fitting disclosed in this embodiment allows refrigerant fluid carrying solid impurities to enter through the liquid inlet of the end cylinder 103 during operation. It first flows into the internal cavity of the filter cylinder 102. Under pressure, the fluid is forced to pass through the side wall and conical bottom wall of the filter element 1022, where solid particulate impurities are effectively intercepted on the inner surface of the filter cylinder 102. The filtered clean fluid enters the liquid outlet cavity between the filter cylinder 102 and the inner wall of the outer cylinder 101, and then flows out from the liquid outlet pipe 1013 at the bottom through the guide of the conical bottom cylinder 1012, and enters the capillary 200 integrated with it for throttling and pressure reduction.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An integrated variable diameter capillary filter tube fitting, characterized by: The filter includes a filter (100) and a capillary tube (200) integrally fixed with the filter (100). The filter (100) includes an outer cylinder (101), a filter cylinder (102), and an end cylinder (103). The capillary tube (200) is fixedly connected to the bottom end of the outer cylinder (101). A support platform (104) is fixedly connected inside the outer cylinder (101). The filter cylinder (102) is provided on the support platform (104). The top end of the filter cylinder (102) is provided with an inlet (1023). An outlet cavity is provided between the filter cylinder (102) and the inner wall of the outer cylinder (101). The end cylinder (103) is fixedly connected to the outer cylinder (101). The end cylinder (103) presses the filter cylinder (102) down onto the support platform (104).

2. The one-piece variable diameter capillary filter tube fitting of claim 1, wherein: The filter cartridge (102) includes a mounting ring (1021) and a filter element (1022) fixedly connected to the mounting ring (1021). The end cylinder (103) presses the mounting ring (1021) down onto the support platform (104).

3. The one-piece variable diameter capillary filter tube fitting of claim 2, wherein: The bottom of the filter element (1022) has a conical structure.

4. The one-piece variable diameter capillary filter tube fitting of claim 2, wherein: A first sealing ring (105) is provided between the support platform (104) and the mounting ring (1021).

5. The one-piece variable diameter capillary filter tube fitting of claim 4, wherein: The end cylinder (103) includes a main body (1031) and an installation part (1032) integral with the main body (1031). The installation part (1032) is fitted into the outer cylinder (101) and presses down the installation ring (1021). The main body (1031) is provided with a liquid inlet connection port.

6. The one-piece variable diameter capillary filter tube of claim 5, wherein: A second sealing ring (106) is provided between the mounting part (1032) and the mounting ring (1021).

7. The one-piece variable diameter capillary filter tube of claim 5, wherein: The mounting part (1032) and the outer cylinder (101) are fixedly connected by a threaded connection.

8. The one-piece variable diameter capillary filter tube of claim 5, wherein: The main body (1031) and the outer cylinder (101) are fixedly connected by welding.

9. The one-piece variable diameter capillary filter tube of claim 1, wherein: The outer cylinder (101) includes an annular main cylinder (1011) and a conical bottom cylinder (1012) integrally formed with the annular main cylinder (1011). A liquid outlet pipe (1013) is fixedly connected to the bottom of the conical bottom cylinder (1012). The capillary tube (200) is integrally connected to the liquid outlet pipe (1013). The support platform (104) is fixedly connected inside the annular main cylinder (1011).

10. The one-piece variable diameter capillary filter tube fitting of claim 2, wherein: The filter element (1022) is made of stainless steel.

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