Refrigeration system and drying filter

Abstract

The application discloses a refrigeration system and a drying filter, wherein one end of a filter core close to an inlet position is positioned through an inlet pipe, a spring is not needed to be arranged, the number of parts is reduced, product cost is lowered, and the assembling space of the inlet pipe and the filter core is relatively small, so that the utilization rate of the internal space of the product can be improved, the miniaturization design requirement of the product can be met, the filling space of the filter core can be increased for the product with the same size, and the drying performance of the product is improved; in addition, for the drying filter provided with the inlet end cover and the outlet end cover, the inlet end cover is gap-fitted to one opening of a cylinder body and is fixed by welding connection, and the outlet end cover is gap-fitted to the other opening of the cylinder body and is fixed by welding connection; in this way, the inlet end cover and the outlet end cover can be designed uniformly, and separate mold manufacturing is not needed, the forming and assembling efficiency of the product is improved, and the design cost of the product is lowered.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to a refrigeration system and a drying filter. Background Technology

[0002] Dryer filters are typically installed between the condenser and the expansion valve. They are designed with a combination of drying and filtering materials to prevent impurities and soluble substances from entering key components of the refrigeration system, while absorbing excess moisture and acidic substances. This avoids system blockage and ice blockage, ensuring the system operates in optimal condition and reducing maintenance. Summary of the Invention

[0003] The purpose of this invention is to provide a drying filter with good drying effect and a refrigeration system having the drying filter.

[0004] This invention provides a drying filter, comprising a housing, an inlet pipe, and a filter element. The housing has an inner cavity, and the filter element is located within the inner cavity of the housing. The inner end of the inlet pipe passes through the housing and abuts against the filter element to position the end of the filter element near the inlet pipe.

[0005] In the dryer filter provided by the present invention, the end of the filter element near the inlet is positioned by the inlet pipe. Compared with the use of spring for fixing, the dryer filter of the present invention does not need to be equipped with spring, which reduces the number of parts, lowers the product cost, and the assembly space between the inlet pipe and the filter element is relatively small, which can improve the utilization rate of the internal space of the product and help meet the needs of product miniaturization design.

[0006] In addition, the present invention also provides a refrigeration system, including a compressor, a condenser, a throttling device and an evaporator, which are connected by pipelines to form a refrigerant circuit, and a dryer filter as described above is provided between the condenser and the throttling device.

[0007] The refrigeration system of the present invention includes the above-mentioned dryer filter, and therefore also has the above-mentioned technical effects of the dryer filter. Attached Figure Description

[0008] Figure 1 This is a cross-sectional view of the drying filter in the first embodiment of the present invention;

[0009] Figure 2 This is a schematic diagram of the structure of the inlet pipe in the first embodiment of the present invention;

[0010] Figure 3 This is a schematic diagram of the structure of some components of the drying filter in the second embodiment of the present invention;

[0011] Figure 4 This is a schematic diagram of the inlet pipe in the second embodiment of the present invention;

[0012] Figure 5 for Figure 3 The diagram shows the structure of the filter element shown.

[0013] Figure 6 for Figure 3 Schematic diagram of the structure of the middle filter;

[0014] Figure 7 This is a schematic diagram of the structure of some components of the drying filter in the third embodiment of the present invention;

[0015] Figure 8 for Figure 7 The diagram shows the structure of the dryer filter from another direction.

[0016] in, Figures 1 to 8 middle:

[0017] 1 Shell; 11 Cylinder; 12 Inlet end cap; 13 Outlet end cap; 14 First cavity; 2 Filter element; 21 Fluid channel; 22 Groove; 2a Conical surface; 3 Inlet pipe; 31 Refrigerant channel; 311 Opening; 312 Notch; 3a First end face; 32 Guide plate; 4 Filter disc; 41 First through hole; 42 Second through hole; 5 Outlet pipe; 6 Bottom filter disc; 7 Baffle. Detailed Implementation

[0018] The current dryer filter includes an inlet pipe, an outlet pipe, an inlet end cap, an outlet end cap, and a body. The above components are assembled to form the main body of the product. The inner cavity formed by the main body contains a spring, a filter plate, a filter element, and a baffle. The spring is located at the inlet end of the dryer filter, with both ends abutting against the inlet end cap and the filter element to press and position the filter element inside the main body.

[0019] The space inside the main body where the spring is located is not filled with drying or filtering materials, so it does not dry or filter the refrigerant entering the product, resulting in a waste of the internal space.

[0020] Secondly, the spring is typically fixed in contact with the beveled surface of the filter element. A soft filter element helps to alleviate the spring's clamping force, preventing hard contact between the spring and the filter element. However, with no positioning guide during spring assembly, the spring's placement is determined visually. Achieving a horizontal spring that coincides with the center of the filter element is difficult, and after press-fitting, a certain angle of misalignment is likely to occur. This results in differences in clamping force at the same horizontal position on the filter element, and under the vibration of the system during operation, the spring's fixed position is prone to shifting and loosening.

[0021] In addition, for the spring-fixed structure of the dryer filter, in order to meet the processability of spring compression and fixing, the inlet end cap and the body are designed to be interference fit. The inlet end cap and the body are first pre-fixed by press fitting process and then welded together. The inlet end cap and the outlet end cap need to be designed and molded separately to prevent errors, which increases the production cost and management cost of the product, resulting in a relatively high production cost.

[0022] This paper explores extensively how to address one of the aforementioned shortcomings and proposes a series of solutions.

[0023] 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.

[0024] Please refer to Figures 1 to 2 , Figure 1 This is a cross-sectional view of the drying filter in the first embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the inlet pipe in the first embodiment of the present invention.

[0025] The present invention provides a drying filter, specifically a one-way drying filter, which includes a housing 1, an inlet pipe 3, and a filter element 2.

[0026] The shell 1 has an inner cavity. The shell 1 can be formed in various ways. For example, the shell 1 may specifically include an inlet end cap 12, an outlet end cap 13, and a cylindrical body 11. The cylindrical body 11 is open at both ends, and the inlet end cap 12 and the outlet end cap 13 are respectively installed at the open ends of the cylindrical body 11. Of course, the shell 1 can also adopt a two-section structure. For example, the shell 1 includes two cylindrical sections with opposite openings, and the two cylindrical sections are welded together to form an inner cavity.

[0027] In this invention, the filter element 2 is located in the inner cavity of the housing 1, and the inner end of the inlet pipe 3 passes through the housing 1 and abuts against the filter element 2 to position the end of the filter element 2 close to the inlet pipe 3.

[0028] In the dryer filter provided by the present invention, the end of the filter element 2 near the inlet is positioned by the inlet pipe 3. Compared with the use of spring for fixing, the dryer filter of the present invention does not need to be set with spring, which reduces the number of parts and lowers the product cost. In addition, the assembly space between the inlet pipe 3 and the filter element 2 is relatively small, which can improve the utilization rate of the internal space of the product and help meet the needs of product miniaturization design. Furthermore, for products of the same size, the filling space of the filter element 2 can be increased, thereby improving the drying performance of the product.

[0029] In addition, for the dryer filter with inlet end cap 12 and outlet end cap 13, the inlet end cap 12 is fitted with one opening of the cylinder 11 and the two are welded together and fixed, and the outlet end cap 13 is fitted with the other opening of the cylinder 11 and the two are welded together and fixed. In this way, the inlet end cap 12 and the outlet end cap 13 can be designed uniformly, without the need for separate mold making, which improves the product molding and assembly efficiency and reduces the product design cost.

[0030] In one specific embodiment, a first cavity is formed between the end 2a of the filter element 2 near the inlet pipe 3 and the inner wall of the housing 1. The pipe wall of the inlet pipe 3 is also provided with a refrigerant channel 31 that connects the inner cavity of the inlet pipe 3 and the first cavity. That is to say, the refrigerant inside the inlet pipe 3 can enter the first cavity through the refrigerant channel 31, and then flow through the first cavity through the filter element 2 for drying and filtration before entering the outlet pipe 5.

[0031] This setup minimizes the inlet resistance of the refrigerant in the inlet pipe 3 and allows the refrigerant to flow in from one axial end of the filter element 2 and out from the other end, maximizing the refrigerant drying path and improving drying efficiency.

[0032] There are various ways to fix the filter element 2 and the inlet pipe 3 together.

[0033] In one specific embodiment, the filter element 2 is provided with a groove 22 that opens toward the inlet pipe 3, and the end section of the inlet pipe 3 mates with the groove 22. That is, the filter element 2 is provided with a groove 22, and the inlet pipe 3 is inserted into the groove 22 to achieve positioning.

[0034] The groove 22 forming structure on the filter element 2 is relatively simple and helps to reduce the amount of material used in the filter element 2, thereby further reducing product costs.

[0035] Of course, the filter element 2 may also be provided with a protruding post facing the inlet pipe 3, and the protruding post is at least partially inserted into the inner cavity of the inlet pipe 3 and installed in conjunction with the inner cavity of the pipe.

[0036] As described above, the filter element 2 can be machined with grooves or protrusions to fit the outer or inner peripheral wall of the inlet pipe 3. The attached figure shows a specific embodiment in which the groove is provided on the filter element 2.

[0037] Furthermore, the bottom of the groove can be flat, and the end face of the inlet pipe 3 fits and abuts against the bottom of the groove. The inlet pipe 3 and the filter element 2 are fixed in planar contact, which makes it less prone to skewing after assembly and improves the reliability of the filter element 2's fixation.

[0038] Please refer to this again. Figure 7 and Figure 8 The refrigerant passage 31 can be installed on the pipe section of the inlet pipe 3 located in the first cavity 14.

[0039] To ensure that the refrigerant can enter the first cavity 14 evenly and smoothly, the refrigerant channel 31 can also be equipped with a guide vane to guide the airflow from the inner cavity of the pipe to the first cavity 14. One end of the guide vane is connected to the refrigerant channel 31, and the other end extends into the inner cavity of the pipe. This achieves airflow guidance while avoiding the guide vane occupying the internal space of the first cavity 14. The specific structural form of the guide vane can be set according to requirements.

[0040] The materials of the inlet pipe 3 and filter element 2 are usually relatively hard. In order to avoid damage to them due to excessive force during installation, the following settings can be made.

[0041] In the above embodiments, the drying filter may further include a filter element 4 disposed between the inlet pipe 3 and the filter element 2. The inlet pipe 3 contacts and engages with the filter element 2 through the filter element, wherein the hardness of the filter element is less than that of the inlet pipe 3 and the filter element 2 in contact with it. The inlet pipe 3 and the filter element 2 are fixed in surface contact with hard materials, and the soft material of the filter element 4 relieves the clamping force at the contact position between the inlet pipe 3 and the filter element 2. Under the action of system vibration, the tendency of pipe deformation and displacement is small.

[0042] Please refer to Figures 3 to 6 In the third specific embodiment, the first end face 3a of the inlet pipe 3 inserted into the filter element 2 has an opening 311, that is, the inlet pipe 3 is a cylindrical pipe with openings at both ends. At least one notch 312 is also provided on the first end face 3a. The end of the filter element 2 near the inlet pipe 3 is also provided with a fluid channel 21. The notch 312 is connected to the first cavity 14 through the corresponding fluid channel 21.

[0043] The process of forming a notch on the first end face 3a is simple and does not reduce the strength of the inlet pipe 3. Furthermore, this arrangement can reduce the flow resistance of the refrigerant entering the product. The opening 311 of the first end face 3a of the inlet pipe 3 can be of any shape, such as semi-circular, elliptical, or other different structures.

[0044] The filter element 2 features circumferential grooves to serve as refrigerant flow channels. Simultaneously, the perforated design of the filter element reduces pressure loss and minimizes the impact of the fixed structure on product flow. See the diagram below for details.

[0045] In the embodiment where a filter element is provided between the inlet pipe 3 and the filter element 2, the filter element 4 and each notch 312 are provided with a first through hole 41 at the corresponding position, and the notch 312 is connected to the fluid channel through the corresponding first through hole 41. This can reduce the resistance of the filter element to the airflow in the inlet pipe 3, reduce pressure loss, and reduce the impact of the inlet pipe 3 positioning the filter element 2 on the flow rate.

[0046] Furthermore, at least one second through hole 42 is provided on the surface of the filter disc opposite to the first end face 3a of the inlet pipe 3. Providing a second through hole 42 on the filter disc further helps to reduce fluid pressure drop loss.

[0047] In addition, the filter element 2 outlet end can be fixed in the following way: the bottom end of the filter element 2 directly abuts against the outlet end cover 13 circumferentially, that is, the bottom edge of the filter element 2 is supported on the outlet end cover 13. Of course, in order to improve the stress performance and filtration performance of both, the bottom end of the filter element 2 can contact the outlet end cover 13 through the bottom filter sheet 6. In addition, a baffle 7 can be further provided outside the bottom filter sheet 6 to filter the cold medium.

[0048] In addition, the end face of the filter element 2 that forms the first cavity can be a conical surface 2a, or it can be a surface of other structural forms.

[0049] In addition, the present invention provides a refrigeration system including a compressor, a condenser, a throttling device and an evaporator, which are connected by pipelines to form a refrigerant circuit. The system is characterized in that a dryer filter of any one of the above-mentioned components is provided between the condenser and the throttling device.

[0050] The refrigeration system of the present invention includes the above-mentioned dryer filter, and therefore also has the above-mentioned technical effects of the dryer filter.

[0051] The refrigeration system and drying filter provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A drying filter, characterized in that, The device includes a housing, an inlet pipe, and a filter element. The housing has an inner cavity, and the filter element is located within the inner cavity of the housing. The inlet pipe is fixedly connected to the housing, with one end of the inlet pipe located within the inner cavity and abutting against the filter element. A first cavity is formed between the end of the filter element near the inlet pipe and the inner wall of the housing. The wall of the inlet pipe is also provided with a refrigerant channel connecting the inner cavity of the inlet pipe and the first cavity. The first end face of the inlet pipe inserted into the filter element has an opening, and at least one notch is also provided on the first end face. A fluid channel is also provided on the end of the filter element near the inlet pipe, and the notch connects to the first cavity through the corresponding fluid channel. The device also includes a filter element disposed between the inlet pipe and the filter element. The inlet pipe contacts and engages with the filter element through the filter element, and the filter element and each notch are provided with a first through hole at a corresponding position. The notch connects to the fluid channel through the corresponding first through hole.

2. The drying filter as described in claim 1, characterized in that, The filter element is provided with a groove facing the opening of the inlet pipe, the end section of the inlet pipe is fitted with the groove, and the first end face of the inlet pipe is in contact with the bottom of the groove. Alternatively, the filter element may be provided with a protruding post facing the inlet pipe, the protruding post being at least partially inserted into the inner cavity of the inlet pipe and fitted with the inner cavity of the pipe.

3. The drying filter as described in claim 1, characterized in that, The housing includes an inlet end cap, an outlet end cap, and a cylindrical body with openings at both ends. The inlet end cap is fitted with one of the openings of the cylindrical body and the two are welded together for fixation. The outlet end cap is fitted with the other opening of the cylindrical body and the two are welded together for fixation.

4. The drying filter according to any one of claims 1 to 3, characterized in that, The refrigerant channel is located on the pipe section of the inlet pipe that is situated in the first cavity.

5. The drying filter as described in claim 4, characterized in that, The refrigerant channel is provided with a guide vane for guiding the airflow in the inner cavity of the pipe to the first cavity, and one end of the guide vane is connected to the refrigerant channel, and the other end extends into the inner cavity of the pipe; The hardness of the filter element is less than that of the inlet pipe and the filter element in contact with it.

6. The drying filter according to any one of claims 1 to 3, characterized in that, At least one second through hole is provided on the surface of the filter disc opposite to the first end face of the inlet pipe.

7. A refrigeration system comprising a compressor, a condenser, a throttling device, and an evaporator, the four components forming a refrigerant circuit via piping, characterized in that, A drying filter according to any one of claims 1 to 6 is further provided between the condenser and the throttling device.

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