Automatic purge device, system and automatic purge method

Abstract

The present invention discloses an automatic purge device, system and automatic purge method. The automatic purge system comprises an automatic purge device and a tube expansion device, wherein the automatic purge device comprises a substrate and an air outlet, wherein the substrate is hollow inside, a through hole and an air inlet end are provided on the substrate, the air outlet is inserted in the through hole, and an air outlet hole is provided on the air outlet; the tube expansion device comprises a lower die seat, an expansion sleeve, an expansion head and a clamping jaw, wherein the expansion sleeve is fixedly arranged on the lower side of the lower die seat, the clamping jaw is inserted in the expansion sleeve, an air vent is provided on the expansion sleeve, and the clamping jaw has an air outlet gap; the automatic purge device is installed on the lower side of the lower die seat, wherein the expansion sleeve is inserted in the air outlet, so that the air vent of the expansion sleeve is connected with the air outlet of the air outlet, when high-pressure gas is introduced, the high-pressure gas instantly fills the inside of the substrate, and successively passes through the air outlet, the air vent and the air outlet gap into the inside of the clamping jaw, and finally is discharged through the clamping jaw to purge the tube mouth end of the copper tube, thereby realizing automatic purge and improving purge efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and in particular to an automatic purge device, system and automatic purge method. Background Art

[0002] The heat exchanger of an air conditioner is the main component for the air conditioner to achieve cooling or heating functions. The heat exchanger of an air conditioner is mainly composed of multiple internally threaded copper tubes strung on aluminum fins and tightened. The copper tubes are welded together in series through elbows to form a sealed space. The refrigerant circulates inside to achieve heat exchange with the outside air and achieve the effect of regulating the indoor air.

[0003] During the assembly and production process of the heat exchanger, the copper tubes need to pass through hundreds of overlapping fin holes one by one. During the process of passing the tubes, trace aluminum powder dropped by the friction between the copper tubes and the fin holes is easy to remain on the tube ends of the copper tubes. Impurities remaining on the tube ends will seriously affect the elbow welding process, resulting in the inability to effectively guarantee the welding quality. After the user's air conditioner is installed, there is a risk of refrigerant leakage affecting the cooling effect.

[0004] At present, various air-conditioning factories on the market generally use compressed air to manually blow the ends of the copper tubes one by one. However, this blowing method causes serious waste of manpower, and the stability of manual operation quality is poor. There is also leakage. In actual operation, the effectiveness and authenticity of the manual blowing action of impurities cannot be effectively guaranteed. Summary of the invention

[0005] The embodiments of the present invention provide an automatic purging device, system and automatic purging method, which are intended to solve the problems of poor stability and waste of manpower in the impurity purging at the pipe end of the existing copper pipe.

[0006] The present invention provides an automatic purge device, comprising: a substrate and an air outlet piece, wherein the substrate is hollow inside, a through hole is provided on the substrate, and an air inlet end is also provided; the air outlet piece is inserted in the through hole, and an air outlet hole is provided on the air outlet piece, wherein high-pressure gas enters into the interior of the substrate from the air inlet end, and is discharged through the air outlet hole on the air outlet piece.

[0007] In the automatic purge device provided by the present invention, the air outlet member includes a driving part and a shielding part connected to the driving part, and the driving part is used to drive the shielding part to move to shield or reveal the air outlet.

[0008] In the automatic purge device provided by the present invention, the air outlet component includes a cylinder, the air outlet is opened on the cylinder wall of the cylinder, the shielding portion is arranged in the cylinder wall and opposite to the air outlet, and the driving portion is arranged in the cylinder wall to drive the shielding portion to move; wherein the driving portion at least partially protrudes from the outside of the cylinder wall and protrudes toward the inner side of the cylinder.

[0009] In the automatic purge device provided by the present invention, the driving part includes a plurality of balls, a fixed plate and a spring, and the plurality of balls, the shielding part, the spring and the fixed plate are sequentially arranged in the cylinder wall along the circumference of the cylinder; an extrusion hole is opened on the cylinder wall facing the inner side of the cylinder, and the balls away from the shielding part are arranged in the extrusion hole and at least partially exposed outside the extrusion hole.

[0010] In the automatic purge device provided by the present invention, the air outlet holes are provided in a plurality of groups, each group is provided with a plurality of the air outlet holes, the plurality of groups of the air outlet holes are arranged along the circumference of the cylinder, and the plurality of the air outlet holes in each group are opened on the cylinder wall along the axial direction of the cylinder.

[0011] In the automatic purge device provided by the present invention, the shielding portion is an arc-shaped baffle plate, and a plurality of air outlet channels are provided on the arc-shaped baffle plate, and the plurality of air outlet channels are arranged at intervals; wherein, when the arc-shaped baffle plate reveals the air outlet holes, each of the air outlet channels corresponds to each group of the air outlet holes.

[0012] In the automatic purge device provided by the present invention, the cylinder wall includes an outer wall, an inner wall, a top wall and a bottom wall, the outer wall and the inner wall are both cylindrical with both ends open, the outer wall and the inner wall are radially spaced apart, and the top wall and the bottom wall are respectively sealed with the two ends of the outer wall and the inner wall; wherein the air outlet passes through the inner wall and the outer wall.

[0013] The present invention also provides an automatic purge system, comprising a tube expansion device and an automatic purge device, wherein the automatic purge device is the automatic purge device described above, and the tube expansion device comprises a lower die seat, an expansion sleeve, an expansion head and a clamp, wherein the expansion sleeve is fixed to the lower side of the lower die seat, the clamp is inserted into the expansion sleeve, the expansion head is inserted into the clamp, a vent hole is provided on the expansion sleeve, and the clamp has an air outlet gap connected to the vent hole; wherein the automatic purge device is installed on the lower side of the lower die seat, the expansion sleeve is inserted into the air outlet piece, and the vent hole is connected to the air outlet hole; the high-pressure gas enters the interior of the clamp through the air outlet hole, the vent hole and the air outlet gap in turn, and is discharged through the clamp for purging.

[0014] The present invention also provides an automatic purge method, which is applied to an automatic purge system, wherein the automatic purge system is the automatic purge system described above, and the method comprises: controlling the lower die seat to move downward toward the pipe mouth end of the copper tube of the heat exchanger; when the distance between the lower die seat and the pipe mouth end reaches a preset distance, introducing high-pressure gas into the automatic purge device so that the clamp discharges the high-pressure gas to purge the pipe mouth end; when the clamp reaches the pipe mouth end, stopping the introduction of high-pressure gas.

[0015] The present invention provides an automatic purge device, system and automatic purge method. The automatic purge system comprises an automatic purge device and a tube expansion device. The automatic purge device comprises a substrate and an air outlet piece. The interior of the substrate is hollow. A through hole is provided on the substrate. The substrate is also provided with an air inlet end for introducing high-pressure gas. The air outlet piece is inserted in the through hole. An air outlet hole is provided on the air outlet piece. The tube expansion device comprises a lower die seat, an expansion sleeve, an expansion head and a clamping jaw. The expansion sleeve is fixedly arranged on the lower side of the lower die seat. The clamping jaw is inserted in the expansion sleeve. An air vent is provided on the expansion sleeve. The clamping jaw has an air outlet gap. The automatic purge device is integrally installed on the lower side of the lower die seat. The expansion sleeve is inserted in the air outlet piece so that the air vent of the expansion sleeve is connected with the air outlet hole of the air outlet piece. Therefore, when high-pressure gas is introduced, the high-pressure gas instantly fills the interior of the substrate, and enters the interior of the clamp through the air outlet, the vent hole, and the air outlet slit in turn, and is finally discharged through the clamp to purge the tube end of the copper tube; by combining the automatic purge device with the expansion sleeve clamp on the tube expansion equipment, and utilizing the one-to-one correspondence between the clamp of the tube expander and the copper tube of the heat exchanger, the high-pressure gas is perfectly and accurately blown in from the tube end of the copper tube. When the high-pressure gas enters the tube end, the aluminum powder impurities remaining at the tube end are removed by the gas pressure, replacing the manual purge method, and the tube ends of all copper tubes are purged at one time, and the purge action is automatically completed, thereby improving the purge stability and efficiency, saving human resources, and avoiding leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0017] Figure 1 is a schematic diagram of an automatic purge system according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 A magnified view of part A;

[0019] Figure 3 It is a schematic diagram of the assembly of the automatic purge device and the lower die holder according to an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of an expansion head of a tube expansion device according to an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of the clamping jaws of the tube expansion device according to an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of an expansion sleeve of a tube expansion device according to an embodiment of the present invention;

[0023] Figure 7 A schematic diagram of an air outlet component of an automatic purge device according to an embodiment of the present invention;

[0024] Figure 8 A schematic top view of a substrate of an automatic purge device according to an embodiment of the present invention;

[0025] Fig. 9 A schematic front view of a substrate of an automatic purge device according to an embodiment of the present invention;

[0026] Fig.10 A schematic side view of a substrate of an automatic purge device according to an embodiment of the present invention;

[0027] Fig.11 A three-dimensional schematic diagram of an air outlet component of an automatic purge device according to an embodiment of the present invention;

[0028] Fig.12 A schematic top view of an air outlet component of an automatic purge device according to an embodiment of the present invention;

[0029] Fig.13 A perspective schematic diagram of an air outlet component of an automatic purge device according to an embodiment of the present invention;

[0030] Fig.14 for Fig.13 AA section view;

[0031] Fig.15 A schematic diagram of an air outlet component of an automatic purge device according to an embodiment of the present invention being unfolded;

[0032] Fig.16 Another schematic diagram of the air outlet component of the automatic purge device according to an embodiment of the present invention;

[0033] Fig.17 A flowchart of the steps of the automatic purging method according to an embodiment of the present invention;

[0034] Fig.18 A flowchart of the steps of an automatic purging method according to another embodiment of the present invention;

[0035] 1. Expansion equipment; 11. Lower die base; 12. Expansion sleeve; 121. Vent hole; 13. Clamping jaws; 131. Air outlet slit; 14. Expansion head; 15. Expansion machine core rod; 2. Automatic purge device; 21. Base plate; 211. Through hole; 212. Air inlet end; 22. Air outlet piece; 221. Cylinder; 2211. Outer wall; 2212. Inner wall; 2213. Air outlet hole; 222. Ball bearing; 223. Fixed plate; 224. Spring; 225. Arc baffle; 2251. Air outlet; 226. Arc wall; 3. Copper tube. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present invention, but are not used to limit the present invention. In addition, in the drawings, structures with similar or identical structures are represented by the same reference numerals.

[0038] See also Figure 1 , Figure 1 The schematic diagram of the automatic purge system in one embodiment of the present invention. The automatic purge system includes an automatic purge device 2 and a tube expansion device 1. The tube expansion device 1 can be a "non-shrinkage tube expansion device 1". The "non-shrinkage tube expansion device 1" is a type of tube expansion device 1. The "shrinkage tube expansion device" is a traditional tube expansion device 1. Due to the different shrinkage rates of the copper tube 3, the length of the copper tube 3 is determined after manual verification. During the tube expansion process, the device does not interfere with the shrinkage of the copper tube 3. The "non-shrinkage tube expander" fixes the bottom of the copper tube 3 at the bottom of the tube expansion process, inserts the copper tube 3 through the upper end of the tube mouth through the open end of the clamp 13, and uses the expansion sleeve 12 to compress the open clamp 13 downward to tighten it, so as to fix the copper tube 3. The copper tube 3 does not shrink (stretch) during the tube expansion process. The structure and working principle of the automatic purge device 2 and the tube expansion device 1 are described in detail below in conjunction with the drawings in the specification.

[0039] Reference Figure 2-Figure 7The tube expansion device 1 provided in the embodiment of the present invention comprises a lower die seat 11, an expansion sleeve 12, an expansion head 14, a clamping jaw 13 and a tube expansion machine core rod 15. The expansion sleeve 12 is screwed to the lower side of the lower die seat 11, the clamping jaw 13 is inserted into the expansion sleeve 12, and the expansion head 14 is inserted into the clamping jaw 13. The clamping jaw 13 is designed as a cylinder, with upper and lower through holes 211 passing through the interior. The shape is narrow at the top and wide at the bottom. The characteristic of the lower wide part is that six slits are cut around the cylinder, that is, the air outlet slit 131. During the downward pressing process of the tube expander, the clamping jaw 13 can accurately insert the tube mouth end of the copper tube 3 into the clamping jaw 13. During the downward pressing process of the expansion sleeve 12 from the narrow part of the upper end of the clamping jaw 13, the lower wide section is contracted to achieve the effect of clamping the tube mouth end. The clamping jaw 13 has a certain length, and the clamping jaw 13 has a certain distance from the expansion sleeve 12, and the expansion head 14 is retracted into the inside of the clamping jaw 13. A plurality of vents 121 are provided on the side wall of the expansion sleeve 12. Since six air outlet slits 131 are provided on the clamping jaws 13, when the clamping jaws 13 are inserted into the expansion sleeve 12, the vents 121 and the air outlet slits 131 have overlapping parts, so the vents 121 on the expansion sleeve 12 can be connected with the air outlet slits 131. It should be noted that the lower die base 11 is in the shape of a rectangular body as a whole. A plurality of tube expansion components consisting of an expansion sleeve 12, an expansion head 14, and clamping jaws 13 are provided on the lower side of the lower die base 11. The number and position of the tube expansion components correspond to the number and position of the copper tubes 3 on the heat exchanger. When the tube expansion device 1 performs the tube expansion process, each clamping jaw 13 will clamp the tube mouth end of each corresponding copper tube 3. Based on the above-mentioned tube expansion device 1, the inventor utilizes the one-to-one correspondence between the clamping jaws 13 of the tube expansion device 1 and the copper tube 3 of the heat exchanger to design the automatic purging device 2 of this embodiment, by adding an automatic purging device 2 to the tube expansion device 1, using the automatic purging device 2 to introduce high-pressure gas to each clamping jaw 13, and using the gas discharged from each clamping jaw 13 to purge the tube mouth of each copper tube 3, replacing the manual purging method, and purging the tube mouths of all copper tubes 3 at one time, automatically completing the purging action, improving the purging stability and efficiency, saving human resources, and avoiding the situation of missed purging. The structure and working principle of the automatic purging device 2 are described in detail below in conjunction with the drawings in the specification.

[0040] Reference Figure 8-Figure 10The embodiment of the present invention also provides an automatic purge device 2, which includes a substrate 21 and an air outlet 22. The substrate 21 is hollow inside, and is provided with a through hole 211. The substrate 21 is also provided with an air inlet end 212; the air outlet 22 is penetrated in the through hole 211, and is provided with an air outlet hole 2213, wherein high-pressure gas enters the interior of the substrate 21 from the air inlet end 212, and is discharged through the air outlet hole 2213 on the air outlet 22. Specifically, the substrate 21 is a hollow rectangular plate as a whole, and two air inlet ends 212 are respectively provided on the short sides of both sides of the rectangular plate, and the air inlet ends 212 are used to connect to a high-pressure air pump and then pass high-pressure gas into the interior of the substrate 21. A plurality of through holes 211 are provided on the substrate 21, and the through holes 211 pass through the upper and lower surfaces of the substrate 21. The number of the gas outlet pieces 22 is the same as the number of the through holes 211 . The gas outlet pieces 22 are penetrated in the through holes 211 so that the through holes 211 are closed and the gas does not leak out from the through holes 211 . The gas outlet holes 2213 are opened on the gas outlet pieces 22 to guide the high-pressure gas to be discharged from the gas outlet holes 2213 .

[0041] It should be noted that the specific structural form of the air outlet member 22 in this embodiment can be various, for example, it can be a sleeve, or it can be an annular structure composed of two arc-shaped pieces. No limitation is made here. No matter what shape it is designed into, as long as it has corresponding air outlet holes 2213 to discharge high-pressure gas to provide it to the clamping jaws 13 for purging.

[0042] Continue to refer to Figure 2 and Figure 3 The installation of the automatic purging device 2 and the lower die seat 11 is specifically as follows: the base plate 21 is locked on the lower side of the lower die seat 11 by bolts, the expansion sleeve 12 on the lower side of the lower die seat 11 passes through the air outlet piece 22, the number of the vent holes 121 of the expansion sleeve 12 is the same as the number of the air outlet holes 2213 on the air outlet piece 22, the vent holes 121 of the expansion sleeve 12 are just opposite to the air outlet holes 2213 of the air outlet piece 22, so that the air outlet holes 2213 are connected with the vent holes 121, then the high-pressure gas discharged from the air outlet holes 2213 can directly pass through the vent holes 121 and enter into the interior of the clamp 13 via the air outlet gap 131.

[0043] By implementing this embodiment, when high-pressure gas is introduced into the air inlet 212, the interior of the substrate 21 is instantly filled with high-pressure gas, and the high-pressure gas is discharged through the air outlet 2213 on the air outlet member 22. After the automatic purge device 2 is installed with the lower die holder 11, the air outlet 2213 and the air vent 121 of the expansion sleeve 12 are connected. In this way, the high-pressure gas smoothly passes through the air outlet 2213 and the air vent 121, and enters the interior of the clamping jaw 13 through the air outlet slit 131 of the clamping jaw 13 in the expansion sleeve 12, and the gas is discharged from the opening at the lower width of the clamping jaw 13, thereby improving the heat exchange. The residual aluminum powder at the pipe end of the copper tube 3 of the heat exchanger after the pipe is penetrated is purged, so as to reduce the proportion of residual aluminum powder impurities at the pipe end of the copper tube 3 of the heat exchanger that affects welding leakage, so that the refrigerant can circulate in the heat exchanger for a long time without reduction, and the air conditioning heat exchange effect is longer; it can be seen that when high-pressure gas is introduced, the high-pressure gas can be discharged from each clamping jaw 13, so that all the copper tubes 3 can be purged at one time, realizing the automatic execution of purging, greatly improving the stability and efficiency of purging, avoiding the occurrence of leakage, saving manpower and material resources, and improving production efficiency.

[0044] In this embodiment, the number and position of the through holes 211 on the base plate 21 of the automatic purge device 2 are consistent with the number and position of the jaws 13 of the expansion sleeve 12 of the lower die seat 11, and the gas outlet 22 in each through hole 211 can be installed one-to-one with each expansion sleeve 12. However, in some special production scenarios, when the number of copper tubes 3 of the heat exchanger is not so large, that is, when the number of copper tubes 3 of the heat exchanger is less than the number of expansion tube components, there will be redundant expansion tube components. If high-pressure gas is introduced into the automatic purge device 2, part of the high-pressure gas will be discharged from the jaws 13 of the redundant expansion tube components. However, these redundant jaws 13 do not have the corresponding copper tubes 3 to be purged, so the high-pressure gas discharged from the redundant jaws 13 will be wasted, resulting in a decrease in gas pressure and affecting the efficiency of blowing.

[0045] To this end, this embodiment proposes a solution, which is to add a movable shielding part, and use the movable shielding part to shield or reveal the air outlet 2213 on the gas piece 22. The shielding part shields the air outlet 2213 to close the air outlet 2213, and reveals the air outlet 2213 to open the air outlet 2213. The shielding part is connected to the driving part, and the shielding part is driven to move by the driving part. Then, in the face of the above-mentioned special production scene, the production personnel can choose to use the driving part and the shielding part to only open the air outlet 2213 on the air outlet piece 22 corresponding to the useful expansion tube component, or close the air outlet 2213 on the air outlet piece 22 corresponding to the redundant expansion tube component. In this way, the air outlet 2213 of a certain number of air outlet pieces 22 can be selectively opened or closed, so as to achieve accurate control of the number of air outlet pieces 22 involved in the purging action, so as to achieve the concentration of purging gas without waste, and improve the purging efficiency. It should be noted that there are many specific structural forms of the shielding part and the driving part in this embodiment, which are not limited here. A preferred specific structure of the air outlet member 22 will be provided below.

[0046] In one embodiment, the air outlet member 22 includes a cylinder 221, the air outlet hole 2213 is opened on the cylinder wall of the cylinder 221, the shielding portion is arranged in the cylinder wall and opposite to the air outlet hole 2213, and the driving portion is arranged in the cylinder wall to drive the shielding portion to move; wherein, the driving portion at least partially protrudes from the outside of the cylinder wall and protrudes toward the inner side of the cylinder 221.

[0047] Reference Fig.11 and Fig.12Specifically, for ease of understanding, the specific structure of the cylinder 221 is first described. The through hole 211 on the substrate 21 is a circular hole. The cylinder 221 is cylindrical as a whole. The cylinder 221 is embedded in the through hole 211. The cylinder wall of the cylinder 221 includes an outer wall 2211, an inner wall 2212, a top wall and a bottom wall. The outer wall 2211 and the inner wall 2212 are both cylindrical with open ends. The outer wall 2211 and the inner wall 2212 are radially spaced apart, and the top wall and the bottom wall are respectively sealed with the two ends of the outer wall 2211 and the inner wall 2212; wherein the air outlet 2213 passes through the inner wall 2212 and the outer wall 2211. The top wall and the bottom wall are flat end walls, which are flush with the upper and lower surfaces of the substrate 21 respectively. The outer wall 2211 faces the hollow area inside the substrate 21. The diameter of the outer wall 2211 matches the diameter of the through hole 211. The outer wall 2211 surrounds the entire through hole 211. The outer wall 2211 isolates the connection between the inside of the substrate 21 and the outside. The inner wall 2212 faces the expansion sleeve 12 (the expansion sleeve 12 passes through the cylinder 221). Since the air outlet 2213 runs through the inner wall 2212 and the outer wall 2211, the gas inside the substrate 21 is radially ejected from the outer wall 2211 to the inner wall 2212 through the air outlet 2213. Therefore, through the above structure of the cylinder 221, the through hole 211 is closed to ensure that the upper and lower ends of the through hole 211 are sealed and airtight, thereby improving the air tightness. The gas can only be radially ejected from the air outlet holes 2213 of the cylinder wall to be provided to the clamping jaws 13 of the expansion sleeve 12 penetrated in the cylinder 221.

[0048] Reference Fig.11 In order to provide more high-pressure gas, a number of gas outlet holes 2213 are provided on the cylinder wall to increase the gas outlet area. The specific distribution of the gas outlet holes 2213 is as follows: the gas outlet holes 2213 are provided with multiple groups, each group is provided with multiple gas outlet holes 2213, multiple groups of gas outlet holes 2213 are arranged along the circumference of the cylinder 221, and multiple gas outlet holes 2213 in each group are provided on the cylinder wall along the axial direction of the cylinder 221. Specifically, on the cylinder wall of the gas outlet member 22, a group of gas outlet holes 2213 is a column of gas outlet holes 2213, and the number of gas outlet holes 2213 in a column is 3, and of course it can be other numbers. The cylinder wall of the gas outlet member 22 is provided with multiple columns of gas outlet holes 2213, which are distributed at intervals along the circumference of the cylinder 221. In this way, the gas inside the substrate 21 can be discharged through the numerous gas outlet holes 2213, the gas outlet area is large, and the purge efficiency is improved.

[0049] In addition, a receiving space for receiving the shielding part and the driving part is defined between the outer wall 2211 and the inner wall 2212, that is, a certain distance is kept between the outer wall 2211 and the inner wall 2212, so that a gap is formed between the outer wall 2211 and the inner wall 2212, and the gap is the receiving space. The driving part and the shielding part are both arranged in the receiving space, which is convenient for driving the shielding part to move and shield the air outlet 2213, and the structure is more compact, which does not affect the assembly of the air outlet part 22 and the through hole 211 / expansion sleeve 12. The air outlet part 22 is an independent assembleable component. The air outlet part 22 is assembled separately and then embedded in the through hole 211 of the substrate 21.

[0050] Reference Fig.12 , the specific structure of the cylinder 221 has been clearly explained above, and the specific structure of the shielding part and the driving part will be described next. In this embodiment, the shielding part and the driving part are arranged in the receiving space of the cylinder wall, and the shielding part is movable in the cylinder wall. The driving part drives the shielding part to move, so that the shielding part moves to overlap with the air outlet 2213 to block the air outlet 2213 and then close the air outlet 2213, or the shielding part moves to a position that does not overlap with the air outlet 2213 to expose the air outlet 2213 and then open the air outlet 2213. In order to enable the driving part to be driven by an external force, the driving part is designed to have a portion protruding from the cylinder wall, and the protruding portion specifically protrudes toward the inner side of the cylinder 221. In this way, when the expansion sleeve 12 passes through the inner side of the cylinder 221, it will contact the driving part, and then the driving part drives the shielding part to move. It should be noted that when the driving part is not driven by external force, that is, the air outlet piece 22 has not yet been assembled with the expansion sleeve 12, the shielding part overlaps with the air outlet hole 2213, and the air outlet hole 2213 is in a closed state; and when the driving part is driven by external force, that is, the air outlet piece 22 is assembled with the expansion sleeve 12, the expansion sleeve 12 conflicts with the driving part, and the driving part drives the shielding part to move, so that the shielding part moves out of the position of the air outlet hole 2213 to expose the air outlet hole 2213, and the air outlet hole 2213 is in an open state.

[0051] Based on this, the expansion sleeve 12 inserted into the air outlet piece 22 can drive the driving part to open the air outlet 2213. On the contrary, if the expansion sleeve 12 is not inserted into the air outlet piece 22, the driving part cannot be driven, and the air outlet 2213 is in a closed state. In this way, in the face of the special production scenario described above, the production personnel first install the corresponding number and position of the expansion sleeve 12 jaws 13 according to the number and position arrangement of the pipe ends of the copper tube 3 of the heat exchanger. In other words, the expansion sleeve 12 jaws 13 are installed at the position corresponding to the pipe end of the copper tube 3 on the lower die seat 11, and the expansion sleeve 12 jaws 13 are not installed at the position not corresponding to the copper tube 3 on the lower die seat 11. Then when the lower die base 11 is installed with the automatic purging device 2, among the outlet parts 22 of the substrate 21, only the outlet parts 22 with the expansion sleeve 12 passing through them have the outlet holes 2213 opened, and the outlet holes 2213 of the outlet parts 22 without the expansion sleeve 12 passing through them are in a closed state. Therefore, the introduced high-pressure gas is only discharged through the opened outlet holes 2213 and provided to the clamping jaws 13 for purging, so that the purging gas is concentrated and not wasted, thereby improving the purging efficiency. Moreover, the driving part is driven when the expansion sleeve 12 is installed. The expansion sleeve 12 is inserted into the outlet part 22 and contacts the driving part, thereby driving the shielding part to move and open the outlet hole 2213. The installation action of the expansion sleeve 12 completes the driving of the driving part, that is, one installation action completes the installation of the expansion sleeve 12 and the driving of the driving part, without the need for additional driving actions, saving process flow, making installation more convenient, and having a high degree of automation.

[0052] Reference Fig.13 and Fig.14Further, in one embodiment, the specific structure of the driving part includes a plurality of balls 222, a fixing plate 223 and a spring 224, wherein the plurality of balls 222, the shielding part, the spring 224 and the fixing plate 223 are sequentially arranged in the cylinder wall along the circumference of the cylinder 221; an extrusion hole is provided on the cylinder wall facing the inner side of the cylinder 221, and the balls 222 away from the shielding part are arranged in the extrusion hole and at least partially exposed outside the extrusion hole. Specifically, the fixing plate 223 is fixed in the receiving space of the cylinder wall, and the fixing plate 223 is fixed and used to abut against the spring 224, one end of the spring 224 abuts against the fixing plate 223, and the other end abuts against the shielding part. The number of balls 222 is multiple, for example, four, and it is understandable that it can also be other numbers. The four balls 222 are arranged side by side, and the two balls 222 located at the outermost side, one of which abuts against the shielding part, and the other is accommodated in the extrusion hole. In order to facilitate the description of the working principle, the ball 222 accommodated in the extrusion hole is referred to as the driving ball 222, and the remaining balls 222 are referred to as the transmission balls 222. In other embodiments, the transmission balls 222 can also be replaced by other components, such as connecting rods. The extrusion hole is opened on the inner side wall 2212 of the cylinder wall, and a part of the driving ball 222 is located in the extrusion hole, and a part is exposed outside the extrusion hole. The diameter of the inner side wall 2212 and the outer diameter of the expansion sleeve 12 have a gap of 1 / 4 of the outer diameter of the ball 222. Then, when the expansion sleeve 12 passes through the inner side of the cylinder 221, the expansion sleeve 12 contacts the edge of the ball 222 exposed outside the extrusion hole, and the expansion sleeve 12 applies a radial outward extrusion force to the ball 222, so that the ball 222 moves toward the direction of the outer side wall 2211 to squeeze the transmission ball 222, so that the transmission ball 222 moves circumferentially, and then pushes the shielding part to move, thereby completing the driving action. In other embodiments, an arc-shaped wall 226 is further provided on the inner side of the extrusion hole, and the arc-shaped wall 226 is used to apply a circumferential thrust to the driving ball 222 to guide the driving ball 222 to move circumferentially to push the transmission ball 222 .

[0053] In order to further describe the driving process of the ball 222, the following is combined with Fig.15 and Fig.16 to describe. Fig.15 is a schematic diagram of the cylinder 221 being spread out when the air outlet 2213 is in a closed state;

[0054] Fig.16 2 is a schematic diagram of the cylinder 221 being spread out when the air outlet 2213 is in an open state. Fig.15 When the ball 222 is not squeezed, the air outlet 2213 is blocked by the blocking portion, and no gas flows out of the air outlet 2213. Fig.16, the ball 222 is squeezed by force, the shielding portion is moved to the right by force, and the air outlet 2213 is opened. At this time, gas flows out of the air outlet 2213.

[0055] Continue to refer to Fig.15 and Fig.16 In one embodiment, the specific structure of the shielding portion is an arc-shaped baffle 225, and a plurality of air outlet channels 2251 are provided on the arc-shaped baffle 225, and the plurality of air outlet channels 2251 are arranged at intervals; wherein, when the arc-shaped baffle 225 reveals the air outlet holes 2213, each of the air outlet channels 2251 corresponds to each group of the air outlet holes 2213. Specifically, the curvature of the arc-shaped baffle 225 is the same as the curvature of the cylinder 221, so that the arc-shaped baffle 225 can move smoothly in the cylinder wall. The number of air outlet channels 2251 provided on the arc-shaped baffle 225 is the same as the number of columns of the air outlet holes 2213 provided on the cylinder wall, and each air outlet channel 2251 corresponds to exposing a column of air outlet holes 2213. In other words, one air outlet channel 2251 can expose multiple air outlet holes 2213, for example, 3 air outlet holes 2213. Then, by matching the arrangement of the air outlet holes 2213 on the cylinder wall with the air outlet duct 2251 on the arc baffle 225, only one arc baffle 225 can open or close multiple rows of air outlet holes 2213, thereby realizing the control of the number of holes, and the structure is simple and the reliability is high. It should also be noted that in this embodiment, in order to improve the stability of the arc baffle 225 moving in the cylinder wall, this embodiment is provided with two sets of upper and lower driving parts, the upper driving part drives the upper side of the side of the arc baffle 225, and the lower driving part drives the lower side of the side of the arc baffle 225, so as to ensure the stability of the arc baffle 225 when moving, and improve the reliability of opening and closing the air outlet holes 2213.

[0056] The embodiment of the present invention further provides an automatic purging method, which is applied to an automatic purging system, wherein the automatic purging system is the automatic purging system described in the above embodiment, and the automatic purging system comprises a tube expansion device 1 and an automatic purging device 2, wherein the automatic purging device 2 is the automatic purging device 2 described in the above embodiment, and the tube expansion device 1 comprises a lower die seat 11, an expansion sleeve 12, an expansion head 14 and a clamping jaw 13, wherein the expansion sleeve 12 is fixedly arranged at the lower side of the lower die seat 11, the clamping jaw 13 is inserted into the expansion sleeve 12, and the expansion head 14 is inserted into the expansion sleeve 12. In the clamping jaw 13, the expansion sleeve 12 is provided with a vent hole 121, and the clamping jaw 13 has a gas outlet slit 131 connected to the vent hole 121; wherein the automatic purging device 2 is installed on the lower side of the lower die seat 11, the expansion sleeve 12 is inserted into the gas outlet member 22, and the vent hole 121 is connected to the gas outlet 2213; the high-pressure gas enters the inside of the clamping jaw 13 through the gas outlet 2213, the vent hole 121, and the gas outlet slit 131 in sequence, and is discharged through the clamping jaw 13 for purging. Fig.17As shown, the automatic purge includes: S1-S3.

[0057] S1, control the lower die seat 11 to move downward toward the tube mouth end of the copper tube 3 of the heat exchanger;

[0058] S2, when the distance between the lower die base 11 and the pipe end reaches a preset distance, high-pressure gas is introduced into the automatic purge device 2 so that the clamping jaws 13 discharge high-pressure gas to purge the pipe end;

[0059] S3. When the clamping jaws 13 reach the pipe end, the introduction of high-pressure gas is stopped.

[0060] In this embodiment, the tube expansion device 1 is started, and the lower die seat 11 drives the claw to slowly move toward the tube end face of the copper tube 3. When the claw 13 is a certain distance away from the tube end of the heat exchanger copper tube 3 (a preset distance, for example, 5 mm), the device starts the high-pressure gas switch through the PLC setting program, and the high-pressure gas enters from the four air inlet ends 212 on the substrate 21, and the interior of the substrate 21 is instantly filled. The high-pressure gas is discharged from the air outlet holes 2213 of the air outlet piece 22 and enters the interior of the claw 13 through the six air outlet slits 131 of the claw 13. The high-pressure gas entering the claw 13 is purged from the opening at the lower width of the claw 13 toward the tube end of the heat exchanger copper tube 3. The purging process is synchronized with the movement of the lower die seat 11 of the device. When the opening at the lower width of the claw 13 passes through the tube end of the heat exchanger copper tube 3, the high-pressure gas switch is closed and the purging action stops.

[0061] In one embodiment, if Fig.18 As shown, the automatic purging method also includes steps: S4-S5.

[0062] S4, if the tube expansion device 1 completes the tube expansion process, the expansion head 14 is controlled to retract into the clamping jaws 13 and the heat exchanger is moved out of the tube expansion station;

[0063] S5 , introducing high-pressure gas into the automatic purging device 2 so that the clamping jaw 13 discharges high-pressure gas to purge the inside of the clamping jaw 13 and the expansion head 14 .

[0064] In this embodiment, after the tube expansion device 1 has been working for a long time, the expansion head 14 and the copper tube 3 rub against each other to produce copper powder remaining on the expansion head 14, causing the surface of the expansion head 14 to become rough or smaller. In order to solve this problem, the high-pressure gas in this embodiment enters the inner wall of the clamping jaw 13 from the side through the clamping jaw 13 of the expansion sleeve 12, so that the copper powder on the surface of the expansion head 14 and the inner side of the clamping jaw 13 is purged and removed by the high-pressure gas.

[0065] Specifically, after the expansion process of the heat exchanger is completed, the expansion head 14 rises to the upper middle position of the clamp 13 and stops. When the heat exchanger moves out of the expansion station, the equipment starts the high-pressure gas switch through the PLC setting program. The high-pressure gas enters the inside of the substrate 21 from the four air inlet ports 212 on the substrate 21 and fills it instantly. The high-pressure gas is discharged from the air outlet 2213 of the air outlet 22 and enters the inside of the clamp 13 through the six air outlet slits 131 of the clamp 13. The high-pressure gas purges and removes the copper powder on the surface of the expansion head 14 above the inside of the clamp 13 and the inner side of the clamp 13. After a certain period of time, the high-pressure gas switch is turned off through the PLC setting program of the equipment, and the purging action stops. In this way, the roughening or wear of the expansion head 14 is reduced, and the expansion of the thin-walled copper tube 3 by the expansion head 14 during the expansion process of the heat exchanger is reduced, and the expansion rate of the copper tube 3 cannot reach the loose fins, which affects the heat exchange effect of the air conditioner.

[0066] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An automatic purge device, characterized in that: include: A substrate, the interior of which is hollow, the substrate is provided with a through hole, and the substrate is also provided with an air inlet end; An air outlet member is inserted into the through hole, and an air outlet hole is provided on the air outlet member. Wherein, the high-pressure gas enters into the interior of the substrate from the gas inlet end and is discharged through the gas outlet hole; The air outlet member comprises a driving part and a shielding part connected to the driving part, wherein the driving part is used to drive the shielding part to move so as to shield or reveal the air outlet hole; The gas outlet member comprises a cylinder, the gas outlet is provided on the cylinder wall of the cylinder, the shielding portion is provided in the cylinder wall and is opposite to the gas outlet, and the driving portion is provided in the cylinder wall to drive the shielding portion to move; wherein the driving portion at least partially protrudes outside the cylinder wall and protrudes toward the inner side of the cylinder; The driving part includes a plurality of balls, a fixing plate and a spring, wherein the plurality of balls, the shielding part, the spring and the fixing plate are sequentially arranged in the cylinder wall along the circumference of the cylinder; an extrusion hole is opened on the cylinder wall facing the inner side of the cylinder, and the balls away from the shielding part are arranged in the extrusion hole and at least partially exposed outside the extrusion hole.

2. The automatic purge device according to claim 1, characterized in that: The air outlet holes are provided in a plurality of groups, each group is provided with a plurality of the air outlet holes, the plurality of groups of the air outlet holes are arranged along the circumference of the cylinder, and the plurality of the air outlet holes in each group are opened on the cylinder wall along the axial direction of the cylinder.

3. The automatic purge device according to claim 2, characterized in that: The shielding portion is an arc-shaped baffle plate, and a plurality of air outlets are provided on the arc-shaped baffle plate, and the plurality of air outlets are arranged at intervals; wherein, when the air outlet holes are exposed by the arc-shaped baffle plate, each of the air outlet holes corresponds to each group of the air outlet holes.

4. The automatic purge device according to claim 1, characterized in that: The cylinder wall includes an outer wall, an inner wall, a top wall and a bottom wall. The outer wall and the inner wall are both cylindrical with both ends open. The outer wall and the inner wall are radially spaced apart. The top wall and the bottom wall are respectively sealed with the two ends of the outer wall and the inner wall; wherein the air outlet passes through the inner wall and the outer wall.

5. An automatic purge system, characterized in that: The invention comprises a tube expansion device and an automatic purge device, wherein the automatic purge device is the automatic purge device according to any one of claims 1 to 4, and the tube expansion device comprises a lower die seat, an expansion sleeve, an expansion head and a clamping jaw, wherein the expansion sleeve is fixedly arranged on the lower side of the lower die seat, the clamping jaw is inserted into the expansion sleeve, the expansion head is inserted into the clamping jaw, a vent hole is provided on the expansion sleeve, and an air outlet slit connected to the vent hole is provided on the clamping jaw; Wherein, the automatic purging device is installed on the lower side of the lower die seat, the expansion sleeve is inserted into the air outlet piece, and the vent hole is connected with the air outlet hole; the high-pressure gas enters the interior of the clamp through the air outlet hole, the vent hole, and the air outlet gap in sequence, and is discharged through the clamp for purging.

6. An automatic purging method, characterized in that: Applied to the automatic purge system of claim 5, the method comprising: Control the lower die seat to move downward toward the tube mouth end of the copper tube of the heat exchanger; When the distance between the lower die seat and the pipe end reaches a preset distance, high-pressure gas is introduced into the automatic purge device so that the clamping jaws discharge high-pressure gas to purge the pipe end; When the clamping jaws reach the end of the pipe mouth, the introduction of high-pressure gas is stopped.

7. The automatic purging method according to claim 6, characterized in that: The method further comprises: If the tube expansion device completes the tube expansion process, the expansion head is controlled to retract into the clamping jaws and the heat exchanger is moved out of the tube expansion station; High-pressure gas is introduced into the automatic purging device so that the clamping jaws discharge high-pressure gas to purge the inside of the clamping jaws and the expansion head.

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