Cleaning needle for removing stains on inner wall of flared pipe

Abstract

The utility model discloses a cleaning needle for removing stains on the inner wall of a flared pipe. The cleaning needle is characterized by comprising a needle seat, a needle rod integrally connected with the needle seat, and a needle cone positioned at the end part of the needle rod, the appearance of the needle base is larger than the outer diameter of the needle rod, a compressed air injection hole is formed in the needle base and the needle rod in the axial direction, an air injection hole is formed in the bottom end of the compressed air injection hole, and the needle rod is longer than a flaring forming inner hole of a machining pipe. A series of problems of complicated production process, sewage and VOC discharge, low production efficiency, high cost and the like of traditional technologies such as water-based cleaning agent cleaning and solvent cleaning are solved, stains are cleaned, the structure is simple, one cleaning needle can be used for a long time, hardware such as a compressor can be integrated into other compressed air nets of a workshop after being put into one time, and the cost is low. No special operation environment requirement exists, and the comprehensive cost is low.

Description

Technical Field

[0001] The utility model relates to the manufacturing technology of refrigerator heat exchange tubes, in particular to a cleaning needle for removing stains on the inner wall of flared tubes. Background Technique

[0002] When manufacturing the end of the refrigerator heat exchange tube, flaring is required. During the flaring and tube expanding process, carbides will be generated due to the use of flaring fluid and the rapid rise in temperature. At the same time, residual flaring oil and the like will also adhere to the inner wall of the tube to form stains. If these stains are not cleaned thoroughly, it will affect the brazing of the subsequent process and cause serious quality problems to the finished product.

[0003] For the stains existing on the inner wall of such small-diameter tubes, the existing cleaning methods mainly include the following several types:

[0004] One is solvent cleaning → drying. After flaring, it is put into an organic solvent cleaning tank for cleaning and then naturally dried. The disadvantages of this method are: due to the use of organic solvents for cleaning, it is not only harmful to the human body, but also causes a large amount of VOC emission problems.

[0005] The second is water-based ultrasonic cleaning → water washing (repeated water washing) → passivation → water washing → drying. The disadvantages of this method are: the process route is long, the efficiency is low, and a large amount of waste water is also generated, increasing the environmental protection pressure; the production cost is high, the energy consumption is high, which is not conducive to energy conservation and emission reduction; there is a quality hidden danger that the moisture on the inner wall of the tube may not be dried, which is likely to cause the ice blockage phenomenon of the refrigerator; in addition, rust is also likely to occur during drying. Summary of the Invention

[0006] The purpose of the utility model is to solve the above problems and provide a cleaning needle for removing stains on the inner wall of the tube. It uses an inserted cleaning needle and utilizes compressed air to reverse high-pressure rinse the stains existing on the inner wall of the tube, and has the characteristics of easy operation, easy positioning, high operation efficiency, simple structure, low cost, and thorough cleaning.

[0007] The above technical problems of the utility model are mainly solved by the following technical solution: A cleaning needle for removing stains on the inner wall of a flared tube, which is characterized in that it includes a needle base, a needle rod integrally connected with the needle base, and a needle cone located at the end of the needle rod; the outer shape of the needle base is larger than the outer diameter of the needle rod, and a compressed air injection hole is provided along the axial direction of the needle base and the needle rod, and an air jet hole is provided at the bottom end of the compressed air injection hole, and the length of the needle rod is greater than the length of the flared inner hole of the processed tube.

[0008] In the foregoing cleaning needle for removing stains on the inner wall of the tube, preferably, the difference between the length of the needle rod and the length of the flared inner hole of the processed tube forms a sewage discharge area.

[0009] In the aforementioned cleaning needle for removing stains on the inner wall of a pipe, preferably, the cross-sectional area of the compressed air injection hole is larger than the cross-sectional area of the gap formed between the outer diameter of the needle rod and the inner hole of the flared end of the processed pipe.

[0010] In the aforementioned cleaning needle for removing stains on the inner wall of a pipe, preferably, a ceramic coating is provided on all or part of the needle cone and on the outer surface of the end of the needle rod towards the needle cone.

[0011] In the aforementioned cleaning needle for removing stains on the inner wall of a pipe, preferably, a plurality of air injection holes are provided, and the plurality of air injection holes are evenly distributed or symmetrically distributed around the circumference of the wall of the compressed air injection hole.

[0012] In the aforementioned cleaning needle for removing stains on the inner wall of a pipe, preferably, the air injection holes are perpendicular to the center line of the compressed air injection hole.

[0013] In the aforementioned cleaning needle for removing stains on the inner wall of a pipe, preferably, the center line of the air injection hole forms an acute angle with a diameter of the circle at the position of the compressed air injection hole where the air injection hole is located.

[0014] In the aforementioned cleaning needle for removing stains on the inner wall of a pipe, preferably, the center line of the air injection hole forms an acute angle with the center line of the compressed air injection hole.

[0015] In the aforementioned cleaning needle for removing stains on the inner wall of a pipe, preferably, the sewage discharge area is sealed and collected into a sewage collection device.

[0016] In the aforementioned cleaning needle for removing stains on the inner wall of a pipe, preferably, the outer diameter of the needle base is larger than the outer diameter of the processed pipe.

[0017] According to the characteristics of the short flaring length and small aperture of the refrigerator heat exchange pipe (condenser pipe), this technical solution designs a cleaning needle that fits the inner hole of the flared end of the processed pipe. The air cleaning needle is inserted into the steel pipe, and the needle cone at the head of the cleaning needle tightly holds the conical hole part formed between the original pipe hole and the inner hole of the flared end, forming a closed bottom. A small space, namely the cleaning area, is formed between the needle rod and the inner hole of the flared end of the processed pipe, exposing all stains in the cleaning area. Then, compressed air is sprayed into the cleaning area through the air injection holes via the compressed air injection hole, and the compressed air rushes out reversely along the inner wall of the flared end inner hole. Thus, the shearing force formed by the high-pressure gas blows the stains out of the pipe.

[0018] The front needle cone of the cleaning needle of this device is naturally aligned and positioned with the conical hole part of the processed pipe. The operation is simple and natural. As long as an appropriate pressure is applied to the end of the cleaning needle, the sealing requirement can be met, avoiding the entry of gas containing stains into the original pipe hole. As long as the coaxiality of the cleaning needle and the processed pipe is stabilized, it can be ensured that all parts of the inner hole of the flared end can be thoroughly cleaned.

[0019] The design of the air jet holes of this device can achieve the purging effect of turbulent or spiral air flow. Turbulent flow, also known as turbulence, occurs when the flow velocity increases to a large extent. At this time, the streamlines are no longer clearly distinguishable, and many small vortices will form in the flow field. There is not only sliding but also mixing between adjacent flow layers, forming turbulence. This disordered and diffusive air flow can comprehensively clean various stains adhering to the inner hole of the flaring molding. Spiral air flow is a kind of air flow with specific rotational characteristics. It moves in a spiral form and has a certain directionality and rotational speed. This air flow form has a good shearing force on the surface of the inner wall of the cylindrical pipe, just like polishing.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: A dry cleaning method is obtained by using a cleaning needle and compressed air, which completely solves a series of problems of traditional technologies such as water-based cleaning agent cleaning and solvent cleaning, including complex production processes, sewage and VOC emissions, low production efficiency, and high costs. The stains are cleaned thoroughly, the structure is simple, a cleaning needle can be used for a long time, and the one-time investment in hardware such as compressors can also be incorporated into other compressed air networks in the workshop. There are no special requirements for the operating environment, and the comprehensive cost is low. Brief Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of this utility model.

[0022] Figure 2 is a schematic structural diagram of an embodiment of this utility model.

[0023] Figure 3 is Figure 1 the sectional structural diagram taken along the A-A direction of

[0024] Figure 4 is a schematic structural diagram of the arrangement of the air jet holes of this utility model.

[0025] Figure 5 is a schematic structural diagram of the second embodiment of the arrangement of the air jet holes of this utility model.

[0026] Figure 6 is a schematic structural diagram of the third embodiment of the arrangement of the air jet holes of this utility model.

[0027] Figure 7 is a schematic structural diagram of the end part of the processing pipe to be correspondingly processed by this utility model.

[0028] Figure 8 is a schematic partial structural diagram of an application state of this utility model.

[0029] In the figure: 1 - cleaning needle, 101 - needle base, 102 - needle rod, 103 - needle cone, 104 - compressed air injection hole, 105 - air jet hole, 106 - ceramic coating, 2 - processing tube, 201 - flaring forming inner hole, 202 - tapered hole part, 203 - original tube hole, 3 - stain.

[0030] B - sewage discharge area. Specific implementation manner

[0031] The technical solution of the present utility model will be further specifically described below through embodiments in conjunction with the accompanying drawings.

[0032] In this embodiment, a cleaning needle 1 for removing stains on the inner wall of a flared tube is as Figure 1 shown. The cleaning needle 1 body includes a cylindrical needle base 101 at one end thereof, a cylindrical open needle rod 102 integrally connected with the needle base 101, and a needle cone 103 at the end of the needle rod 102. The needle base 101, the needle rod 102, and the needle cone 103 are coaxially integrated. The outer diameter of the needle base 101 is greater than the outer diameter of the needle rod 102 and also greater than the outer diameter of the processing tube 2. The large end diameter of the needle cone 103 is equal to that of the needle rod 102, and the tip of the needle cone 103 is a small spherical body.

[0033] All or part of the surface of the needle cone 103 is provided with a ceramic coating 106, where part of the surface refers to the part except the tip part of the needle cone 103.

[0034] The outer surface of the end of the needle rod 102 towards the needle cone 103 is also provided with a ceramic coating 106, and the diameter of the part of the needle rod 102 with the ceramic coating 106 is equal to the aperture of the flaring forming inner hole 201 of the processing tube 2.

[0035] In this embodiment, the processing tube 2 of the refrigerator steel pipe pipeline is used as the cleaning object, and its end is oiled → flared by the conventional technical method to perform the tube expansion process to obtain a semi-finished product of the processing tube 2, as Figure 7 shown, including the original tube hole 203, the flaring forming inner hole 201 as the brazing mating part of the next process, and a tapered hole part 202 between the original tube hole 203 and the flaring forming inner hole 201. According to the characteristics of the flaring process, there will be a small amount of oil stains (which will form stains 3 later) on the tube orifice of the processing tube 2. As the flaring progresses inward, the oil stains gradually decrease until there is none.

[0036] A compressed air injection hole 104 is provided along the axial direction of the needle base 101 and the needle rod 102, and an air jet hole 105 penetrating the tube wall of the needle rod 102 is provided at the bottom end of the compressed air injection hole 104, as Figure 3 shown. The length of the needle rod 102 is greater than the length of the flaring forming inner hole 201 of the processing tube 2, and the difference between the length of the needle rod 102 and the length of the flaring forming inner hole 201 constitutes the sewage discharge area B, see Figure 8, after being hermetically collected in the sewage discharge area B, it is connected to the sewage collection device. The sewage collection device can adopt bag-shaped objects such as silicone polymer sponges and activated carbon that can adsorb oil stains and dust substances.

[0037] The cross-sectional area of the compressed air injection hole 104 is larger than the cross-sectional area of the gap formed between the outer diameter of the needle rod 102 and the inner hole 201 of the flared forming of the processing pipe 2. The purpose is to form a larger pressure difference to promote the generation of an air knife with shear force. For the steel pipe pipeline of a general refrigerator, a gap of 0.1 - 0.2 mm can be left unilaterally between the inner hole 201 of the flared forming of the processing pipe 2 and the outer diameter of the needle rod 102 that cooperates with it.

[0038] A number of air jet holes 105 are provided, and the number of air jet holes is evenly distributed or symmetrically distributed around the wall of the compressed air injection hole 104. Specific embodiments are listed as follows:

[0039] Embodiment 1 of the air jet hole 105: The air jet hole 105 is provided with 2 or 4, as Figure 3 , Figure 4 shown, the center line of the air jet hole 105 is perpendicular to the center line of the compressed air injection hole 104, and is symmetrically or evenly arranged. This structure makes the air flow from the compressed air injection hole 104 injected into the gap space formed between the outer diameter of the cleaning needle 1 and the inner hole 201 of the flared forming of the processing pipe 2 in a turbulent state.

[0040] Embodiment 2 of the air jet hole 105: The air jet hole 105 is provided with 4, as Figure 5 shown, the center line of the air jet hole 105 forms an acute angle with a diameter of the circle at the part of the compressed air injection hole 104 where it is located. This structure makes the air flow from the compressed air injection hole 104 injected into the gap space formed between the outer diameter of the cleaning needle 1 and the inner hole 201 of the flared forming of the processing pipe 2 in a spiral air flow state.

[0041] Embodiment 3 of the air jet hole 105: As Figure 6 shown, the center line of the air jet hole 105 forms an acute angle with the center line of the compressed air injection hole 104, that is, the air outlet of the air jet hole 105 faces the return air direction of the gap space formed between the outer diameter of the cleaning needle 1 and the flared inner hole 201.

[0042] Others: The air jet hole 105 can also be a combined structure of Embodiment 2 and Embodiment 3.

[0043] During use, as Figure 8As shown, the cleaning needle 1 is gently pushed into the flared end of the processing tube 2, so that the needle cone 103 at the front end of the cleaning needle 1 forms a sealing fit with the tapered hole portion 202 formed by the flaring process. A cleaning space is formed between the outer diameter of the needle rod 102 of the cleaning needle 1 and the inner hole 201 of the flared processing tube 2. The sewage discharge area B is formed by the difference between the length of the needle rod 102 and the length of the inner hole 201 of the flared shape. The externally connected dry compressed air is injected from the compressed air injection hole 104 to the cleaning space through the air injection hole 105, and the air flow rushes out in the reverse direction along the wall of the inner hole 201 of the flared shape. The air knife shearing force formed by the high-pressure gas blows out the stains 3 adhering to the inner wall of the inner hole 201 of the flared processing tube 2.

[0044] The above embodiments are illustrative of the present invention, not limiting the present invention. For example, the outer shape of the needle base 101 is a cuboid, etc. Although the present invention is described in combination with preferred embodiments, it should be understood that the present invention is not limited to the preferred embodiments. Those skilled in the art can make various equivalent modifications and substitutions to the technical solutions of the present invention based on the teachings of the present invention. Therefore, the scope of the present invention should be defined by the claims, and all those equivalent modifications and substitutions belong to the protection scope of the technical solutions of the present invention.

Claims

1. A cleaning needle for removing stains on the inner wall of a flared pipe, characterized in that It includes a needle base (101), a needle rod (102) integrally connected to the needle base, and a needle cone (103) located at the end of the needle rod; the outer shape of the needle base is larger than the outer diameter of the needle rod, and a compressed air injection hole (104) is provided axially along the needle base and the needle rod, and an air jet hole (105) is provided at the bottom end of the compressed air injection hole, and the length of the needle rod is greater than the length of the flaring forming inner hole (201) of the processing tube (2).

2. The cleaning needle for removing stains on the inner wall of a flared tube according to claim 1, wherein The difference between the length of the needle rod (102) and the length of the flaring forming inner hole (201) of the processing tube (2) forms a sewage discharge area (B).

3. The cleaning needle for removing stains on the inner wall of a flared tube according to claim 1, wherein, The cross-sectional area of the compressed air injection hole (104) is larger than the cross-sectional area of the gap formed between the outer diameter of the needle rod (102) and the flaring forming inner hole (201) of the processing tube (2).

4. A cleaning needle for removing stains on the inner wall of a flared tube according to claim 1, characterized in that, A ceramic coating (106) is provided on all or part of the needle cone (103) and the outer surface of the end of the needle rod (102) towards the needle cone.

5. The cleaning needle for removing stains on the inner wall of a flared tube according to claim 1, wherein A plurality of air jet holes (105) are provided, and the plurality of air jet holes are evenly distributed or symmetrically distributed around the wall of the compressed air injection hole (104).

6. The cleaning needle for removing stains on the inner wall of the flared tube according to claim 1 or 5, characterized in that The air jet hole (105) is perpendicular to the center line of the compressed air injection hole (104).

7. A cleaning needle for removing stains on the inner wall of a flared pipe according to claim 1 or 5, characterized in that, The center line of the air jet hole (105) forms an acute angle with a diameter of the circle at the position of the compressed air injection hole (104) where it is located.

8. A cleaning needle for removing stains on the inner wall of a flared tube according to claim 1 or 5, characterized in that, The center line of the air jet hole (105) forms an acute angle with the center line of the compressed air injection hole (104).

9. A cleaning needle for removing stains on the inner wall of a flared tube according to claim 2, wherein, The sewage discharge area (B) is hermetically collected into a sewage collection device.

10. A cleaning needle for removing stains on the inner wall of a flared pipe according to claim 1, characterized in that, The outer diameter of the needle base (101) is larger than the outer diameter of the processing tube (2).

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