Compressor protection frame and welding method thereof

Abstract

The present invention discloses a compressor protection frame and a welding method thereof, wherein the protection frame is connected to a shell of a compressor, the protection frame is provided with a through hole connected to the shell, a waterproof rib is connected above the through hole on the protection frame, and the protection frame is welded to the shell via an upper welding point arranged above the waterproof rib and a lower welding point arranged below the through hole; the welding method of the compressor protection frame can realize reliable welding of the compressor protection frame and the shell; the present invention adopts a spatial separation method, the welding points of the protection frame are distributed above the waterproof rib and below the through hole, so as to realize reliable and stable welding of the protection frame and the shell; not only the production efficiency is high and the cost is saved, but also the welding strength is high, the protection rib plays an effective waterproof role, and the waterproof effect is good.

Description

Technical Field

[0001] The invention belongs to the technical field of compressors, and in particular relates to a compressor protection frame and a welding method thereof. Background Art

[0002] There are two types of compressor protection frames in the prior art. For example, the Chinese patent document with authorization announcement number CN 206098290 disclosed "an integrated relay protection frame" on April 12, 2017. The frame has a back plate with holes on the back. The back plate is surrounded by upper baffles, lower baffles, left baffles and right baffles. The baffles are used for waterproofing. During the stamping process, the baffles may have problems such as dimensional tolerance, and the waterproof effect will be deteriorated.

[0003] Another is as Figure 6 The compressor protection frame shown in the figure has a raised protective rib located outside the wiring hole. The protective rib serves to connect the protection frame and the shell. The protective rib also forms a water retaining ring to effectively block external water from entering the interior of the protection frame, and has a good waterproof function. However, since the protective rib is higher than the welding point, during the welding process, the protective rib first contacts the welding surface of the shell, and participates in welding under the action of the current to form a protective rib welding seal and waterproof. In the actual welding process, the protective rib welding contact area is large and high, and abnormalities such as the protective frame welding falling off or welding through the shell often occur. The protective rib not only fails to play a good connection role, but also fails to play a good water retaining role, which seriously affects the physical quality and market reputation.

[0004] At the same time, because the waterproof arc of this kind of protective frame is divided into circles and has a certain width, the size of the waterproof arc greatly exceeds the size of normal welding points. Before welding, the waterproof protective frame needs to be cleaned with a chemical cleaning agent to prevent the oil film on the welding point from affecting the welding strength. At the same time, a very large current is required to ensure the welding strength during the welding process. The problems caused by the large current are: one is that the shell will be welded through and cause failure, and the other is that the heat generated by the large current causes serious damage to the electrode. It is often necessary to adjust the upper and lower electrodes for welding and replace the electrodes, and the production efficiency is low. If the current changes slightly, the welding will be loose and fall off, which seriously affects the product quality and user satisfaction, and the production efficiency is low and the cost is high. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a compressor protection frame and a welding method thereof which can prevent the protection frame from falling off or welding through the shell after welding, and does not require frequent adjustment and replacement of electrodes, nor does it require special chemical cleaning agents to clean the protection frame, and has high production efficiency and good waterproof effect.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] This compressor protection frame is connected to the shell of the compressor. The protection frame is provided with a through hole connected to the shell. A waterproof rib is connected above the through hole on the protection frame. The protection frame is welded to the shell through an upper welding point arranged above the waterproof rib and a lower welding point arranged below the through hole.

[0008] The waterproof rib is an arc-shaped structure, and the upper welding point and the lower welding point are respectively distributed on different circumferences with the center of the waterproof rib as the center. The radius of the upper welding point is 0.4 to 0.7 mm larger than the radius of the lower welding point.

[0009] The upper welding point and the lower welding point are both convex structures, and the convex height of the upper welding point is 0.3-0.8 mm greater than the convex height of the lower welding point.

[0010] The protruding height of the lower welding point is equal to the thickness of the waterproof rib.

[0011] There are two upper welding points, and the distance between the upper welding points and the top edge of the waterproof rib is 3-4 mm.

[0012] The horizontal distance between the upper welding point and the center of the through hole is 15.4±0.4 mm, and the vertical distance between the upper welding point and the center of the through hole is 18.8±0.4 mm.

[0013] As an implementation scheme, there is one upper welding point, and the upper welding point is located above the middle of the waterproof rib, and the distance between the upper welding point and the top edge of the waterproof rib is 1.5-3 mm.

[0014] The welding method of the compressor protection frame is specifically as follows: the lower electrode is installed and fixed on the base of the shell, the shell welding plane is placed on the lower electrode, and the upper plane of the lower electrode is in full contact with the inner surface of the shell welding plane; the protection frame is placed on the upper electrode, the upper electrode moves vertically downward under the power of the cylinder, and the upper electrode welding surface is at the same height and in full contact with the protection frame;

[0015] The cylinder pressure is adjusted to 0.35-0.40Mpa, the upper electrode moves vertically downward with the protective frame, the upper welding point and the lower welding point of the protective frame contact the welding surface of the shell, as the upper electrode continues to move, the upper welding point and the lower welding point fully contact and compact the welding surface of the shell before welding begins, and the required pre-pressing time is 130-180 milliseconds;

[0016] The welding current is transmitted from the lower electrode to the shell welding surface, and then to the raised upper welding point and lower welding point in close contact with the shell welding surface. The upper welding point, the lower welding point and the shell welding surface have small resistance at their contact points. Under the action of the welding current, the upper welding point and the lower welding point are melted, and at the same time, the shell welding parts in contact with the upper welding point and the lower welding point are melted, forming a reliable connection between the protective frame and the shell welding surface, thus completing the welding of the protective frame and the shell.

[0017] The upper electrode and the lower electrode are both beryllium cobalt copper. The welding current required for welding is 26-31KA, the number of welding pulse power-on times required is 1-2 times, and the welding time is 140-190 milliseconds.

[0018] The upper welding point and the lower welding point are maintained for 280-370 milliseconds after melting. At this time, a small amount of current is diverted to the waterproof ribs to make the waterproof ribs fully contact with the shell and firmly connected.

[0019] The advantages of the present invention are: the present invention adopts a spatial separation method, and the welding points of the protective frame are distributed above the waterproof ribs and below the through holes, so as to realize reliable and stable welding of the protective frame and the shell. The present invention forms a reliable connection between the protective frame and the shell by melting the welding points. Compared with the melting welding connection of the long and large waterproof ribs in the prior art, the required welding current is small, and the large heat generated by the large current is prevented from burning the electrode, and the falling off caused by the loose welding can be avoided; at the same time, the mold adjustment and replacement of the electrode can be avoided, the production efficiency is high, the cost is saved, the welding strength is high, the protective ribs play an effective waterproof role, and the waterproof effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0021] Figure 1 It is a structural schematic diagram of a first embodiment of a compressor protection frame of the present invention.

[0022] Figure 2 It is a schematic structural diagram of a second embodiment of a compressor protection frame of the present invention.

[0023] Figure 3 The figure is a schematic structural diagram of the upper electrode used in the welding method of the compressor protection frame of the present invention.

[0024] Figure 4 The figure is a schematic diagram of the structure of the lower electrode used in the welding method of the compressor protection frame of the present invention.

[0025] Figure 5 It is a schematic diagram of the welding assembly of the upper electrode, the lower electrode, the protection frame and the shell in the welding method of the compressor protection frame of the present invention.

[0026] Figure 6It is a structural schematic diagram of a compressor protection frame in the prior art.

[0027] The marks in the above figure are:

[0028] 1. Lower welding point, 2. Through hole, 3. Upper welding point, 4. Waterproof ribs, 5. Protective frame, 6. Upper welding point supporting surface, 7. Lower welding point supporting surface, 8. Upper electrode, 9. Lower electrode, 10. Upper supporting surface of lower electrode, 11. Shell. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0030] like Figure 1-Figure 2 As shown, the compressor protection frame, the protection frame 5 is connected to the shell 11 of the compressor, the protection frame 5 is provided with a through hole 2 connected to the shell 11, the protection frame 5 is connected with a waterproof rib 4 above the through hole 2, the protection frame 5 is provided with an upper welding point 3 and a lower welding point 1, and the protection frame 5 is welded to the shell 11 through the upper welding point 3 provided above the waterproof rib 4 and the lower welding point 1 provided below the through hole 2. The present invention adopts a spatial separation method, and the welding points of the protection frame 5 are distributed above the waterproof rib 4 and below the through hole 2, so as to realize reliable and stable welding of the protection frame 5 and the shell 11.

[0031] The waterproof ribs 4 are fixed on the protective frame 5 to play a waterproof role. The waterproof ribs 4 do not need to be involved in the welding connection between the protective frame 5 and the shell 11, which can prevent the protective frame 5 from falling off after the waterproof ribs 4 are not welded enough, and the waterproof ribs 4 welding current is too large to weld through the shell 11, thereby improving the reliability of the protective frame 5. At the same time, when the protective frame 5 is welded, it is not necessary to frequently adjust and replace the electrodes, nor is it necessary to clean the protective frame 5 with a special chemical cleaning agent, so the production efficiency is high, the welding current is significantly reduced compared with the previous protective frame 5, the waterproof effect is better, the efficiency is high, the economy is high, and the energy saving effect is good.

[0032] The waterproof rib 4 is an arc-shaped structure, and the upper welding point 3 and the lower welding point 1 are respectively distributed on different circumferences with the center of the waterproof rib 4 as the center, and the radius of the upper welding point 3 is 0.4 to 0.7 mm larger than the radius of the lower welding point 1. The position distribution of the upper welding point 3 and the lower welding point 1 can ensure a good welding effect, and further ensure reliable and stable welding of the protective frame 5 and the shell 11.

[0033] Furthermore, both the upper welding point 3 and the lower welding point 1 are convex structures, and the convex height of the upper welding point 3 is 0.3 to 0.8 mm greater than the convex height of the lower welding point 1. The convex height setting of the upper welding point 3 and the lower welding point 1 can further ensure a better welding effect and ensure reliable and stable welding of the protective frame 5 and the shell 11.

[0034] The raised height of the lower welding point 1 is equal to the thickness of the waterproof rib 4. The raised height of the upper welding point 3 is 0.3 to 0.8 mm greater than the raised height of the lower welding point 1, and the thickness of the waterproof rib 4 is the same as the raised height of the lower welding point 1, so that the waterproof rib 4 does not participate in the welding connection between the protective frame 5 and the shell 11, which facilitates the reliable and stable welding of the protective frame 5 and the shell 11 through the upper welding point 3 and the lower welding point 1.

[0035] like Figure 1 As shown, as an embodiment of the present invention, there are two upper welding points 3, and the distance between the upper welding point 3 and the top edge of the waterproof rib 4 is 3-4 mm. There are two upper welding points 3 and two lower welding points 1, and the protective frame 5 and the shell 11 are reliably connected under the welding action of the four welding points.

[0036] The horizontal distance between the upper welding point 3 and the center of the through hole 2 is 15.4±0.4mm, and the vertical distance between the upper welding point 3 and the center of the through hole 2 is 18.8±0.4mm. The two upper welding points 3 are distributed on the left and right sides of the upper part of the waterproof rib 4 and keep a certain distance to achieve reliable and stable welding between the protective frame 5 and the upper part of the shell 11, thereby improving the structural reliability of the protective frame 5.

[0037] like Figure 2 As shown, as another embodiment of the present invention, there is one upper welding point 3, which is located above the middle of the waterproof rib 4, and the distance between the upper welding point 3 and the top edge of the waterproof rib 4 is 1.5-3mm. There is one upper welding point 3 and two lower welding points 1, and the upper welding point 3 and the lower welding point 1 form a stable three-point positioning connection structure, and the protective frame 5 and the shell 11 are reliably connected under the welding action of the three welding points.

[0038] After adopting the above technical scheme, the waterproof rib 4 is separated from the welding point by utilizing the principle of spatial separation. The waterproof rib 4 does not participate in the welding connection between the protective frame 5 and the shell 1, and all welding is performed by utilizing the welding points. Since the upper welding point has a higher protrusion height and the size and volume of the welding point are much smaller than the size and volume of the waterproof rib 4, the upper welding point contacts the welding surface of the shell 11 first. At this time, the larger current will mostly act to cause the welding point to begin to melt first; when the welding point continues to move downward, the two lower welding points and the waterproof rib 4 will contact the welding surface of the shell 11, and at the same time, the large current will continue to act on the upper welding point 2 and the lower welding point 1, so that most of the welding power acts on the welding point, forming a reliable connection in which the welding point melts first. At this time, the waterproof rib 4 has been in contact with the shell 11 to form a 0 gap, which has played a waterproof role. As the welding point continues to move downward, the small current diverted by the welding part will act on the waterproof rib 4, causing the waterproof rib 4 to slightly contact the welding surface of the shell 11; this welding does not play a role in the strength connection between the protective frame 5 and the shell 11, but it makes the waterproof rib 4 fully contact the welding surface of the shell 11 to form a strong waterproof structure. This completely changes the past use of the waterproof rib 4 and the shell 11 to form a whole after welding to form a sealed waterproof. Because the size of the waterproof rib 4 is very large relative to the welding point, a large welding current is required to weld and melt the waterproof rib 4 to prevent the protective frame 5 from falling off and improve the welding strength. The unfavorable situation improves the welding strength and saves costs.

[0039] like Figure 3-Figure 5 As shown, the welding method of the compressor protection frame is specifically as follows: the lower electrode 9 is installed and fixed on the base of the shell 11, the welding plane of the shell 11 is placed on the lower electrode 9, and the upper plane of the lower electrode 9 is in full contact with the inner surface of the welding plane of the shell 11; the protection frame 5 is placed on the upper electrode 8, and the upper electrode 8 moves vertically downward under the power of the cylinder, and the welding surface of the upper electrode 8 is at the same height and in full contact with the protection frame 5;

[0040] The cylinder pressure is adjusted to 0.35-0.40Mpa, the upper electrode 8 moves vertically downward with the protective frame 5, the upper welding point 3 and the lower welding point 1 of the protective frame 5 contact the welding surface of the shell 11, and as the upper electrode 8 continues to move, the upper welding point 3 and the lower welding point 1 fully contact and compact the welding surface of the shell 11 before welding begins. The pre-pressing time required for the welding point to fully contact and compact the welding surface of the shell 11 is 130-180 milliseconds;

[0041] The welding current is transmitted from the lower electrode 9 to the welding surface of the shell 11, and then to the raised upper welding point 3 and the lower welding point 1 which are in close contact with the welding surface of the shell 11. The upper welding point 3 and the lower welding point 1 have low resistance at the contact with the welding surface of the shell 11. Under the action of the welding current, the upper welding point 3 and the lower welding point 1 melt, and the welding part of the shell 11 which is in contact with the upper welding point 3 and the lower welding point 1 melts, forming a reliable connection between the protective frame 5 and the welding surface of the shell 11, thereby completing the welding of the protective frame 5 and the shell 11.

[0042] The upper electrode 8 and the lower electrode 9 are both made of beryllium cobalt copper. The welding current required for welding is 26-31KA, the number of welding pulse power-on times required is 1-2 times, and the welding time is 140-190 milliseconds.

[0043] The upper welding point 3 and the lower welding point 1 are maintained for 280-370 milliseconds after melting. At this time, a small amount of current is diverted to the waterproof rib 4 so that the waterproof rib 4 and the shell 11 are fully in contact and firmly connected.

[0044] The welding method of the compressor protection frame of the present invention is as follows: the lower electrode 9 is installed and fixed on the machine base, the welding plane of the shell 11 is placed on the upper support surface 10 of the lower electrode 9, the upper support surface 10 of the lower electrode 9 is in full contact with the inner surface of the welding plane of the shell 11, the protection frame 5 is placed on the upper electrode 8 through a magnetic block, the upper electrode 8 is connected to a cylinder, the upper electrode 8 can move vertically downward, the upper welding point support surface 6 and the lower welding point support surface 7 of the upper electrode 8 are of the same height and are in full contact with the inner surface of the protection frame 5, and the upper welding point support surface 6 is pressed on the reverse side of the upper welding point 3. When welding, the upper electrode 8 moves vertically downward with the protection frame 5, the welding point 3 on the protection frame 5 is in contact with the welding surface of the shell 11, and as the upper electrode 8 continues to move downward, the upper welding point 3 and the lower welding point 1 are in full contact with the welding surface of the shell 11, and the welding current melts the upper welding point 3 and the lower welding point 1 to form a reliable strength connection with the welding surface of the shell 11.

[0045] Since the welding point of the present invention is melted to form a reliable connection, compared with the melting welding connection of the long and large waterproof ribs in the prior art, the required welding current is small, and the large heat generated by the large current is prevented from burning the electrode frequently, and the mold adjustment and replacement of the electrode are avoided, the production efficiency is high, the cost is saved, and the welding strength is high.

[0046] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A compressor protection frame connected to a compressor shell, the protection frame is provided with a through hole communicating with the shell, and is characterized in that: A waterproof rib is connected above the through hole on the protection frame, and the protection frame is welded to the shell through an upper welding point arranged above the waterproof rib and a lower welding point arranged below the through hole; The upper welding point and the lower welding point are respectively distributed on different circles with the center of the waterproof rib as the center, and the radius of the upper welding point is 0.4 to 0.7 mm larger than the radius of the lower welding point; the upper welding point and the lower welding point are both convex structures, and the convex height of the upper welding point is 0.3 to 0.8 mm larger than the convex height of the lower welding point; the convex height of the lower welding point is equal to the thickness of the waterproof rib.

2. The compressor protection frame according to claim 1, characterized in that: There are two upper welding points, and the distance between the upper welding points and the top edge of the waterproof rib is 3-4 mm.

3. The compressor protection frame according to claim 1, characterized in that: There is one upper welding point, which is located above the middle of the waterproof rib, and the distance between the upper welding point and the top edge of the waterproof rib is 1.5-3 mm.

4. The compressor protection frame according to claim 2, characterized in that: The horizontal distance between the upper welding point and the center of the through hole is 15.4±0.4 mm, and the vertical distance between the upper welding point and the center of the through hole is 18.8±0.4 mm.

5. A method for welding a compressor protection frame according to any one of claims 1 to 4, characterized in that: Specifically, the lower electrode is mounted and fixed on the base of the shell, the shell welding plane is placed on the lower electrode, and the upper plane of the lower electrode is in full contact with the inner surface of the shell welding plane; the protective frame is placed on the upper electrode, and the upper electrode moves vertically downward under the power of the cylinder, and the upper electrode welding surface is at the same height and in full contact with the protective frame; The cylinder pressure is adjusted to 0.35-0.40Mpa, the upper electrode moves vertically downward with the protective frame, the upper welding point and the lower welding point of the protective frame contact the welding surface of the shell, as the upper electrode continues to move, the upper welding point and the lower welding point fully contact and compact the welding surface of the shell before welding begins, and the required pre-pressing time is 130-180 milliseconds; The welding current is transmitted from the lower electrode to the shell welding surface, and then to the raised upper welding point and lower welding point in close contact with the shell welding surface. The upper welding point, the lower welding point and the shell welding surface have small resistance at their contact points. Under the action of the welding current, the upper welding point and the lower welding point are melted, and at the same time, the shell welding parts in contact with the upper welding point and the lower welding point are melted, forming a reliable connection between the protective frame and the shell welding surface, thus completing the welding of the protective frame and the shell.

6. The welding method of the compressor protection frame according to claim 5, characterized in that: The upper electrode and the lower electrode are both beryllium cobalt copper. The welding current required for welding is 26-31KA, the number of welding pulse power-on times required is 1-2 times, and the welding time is 140-190 milliseconds.

7. The welding method of the compressor protection frame according to claim 6, characterized in that: The upper welding point and the lower welding point are maintained for 280-370 milliseconds after melting. At this time, a small amount of current is diverted to the waterproof ribs to make the waterproof ribs fully contact with the shell and firmly connected.

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