Cooling water tank and welding machine

Abstract

The application discloses a cooling water tank and a welding machine, and relates to the technical field of welding machines, wherein the cooling water tank comprises a water bucket, a filtering assembly and a drain cover; the water bucket is provided with a cavity, a water inlet, a water return inlet and a drain outlet which are communicated with the cavity; part of the outer wall of the water bucket is protruded to form a water outlet nozzle; the water outlet nozzle forms a recess on the inner wall of the water bucket; the filtering assembly comprises a filter cartridge and a pipe body support which are detachably connected with each other; the end of the filter cartridge is inserted into the recess; the recess and the filter cartridge are sealed by a sealing ring; the pipe body support is arranged in the drain outlet; there is a gap between the outer wall of the pipe body support and the inner wall of the drain outlet; the filtering assembly can enter or leave the cavity through the drain outlet; and the drain cover is detachably connected with the drain outlet to open or close the drain outlet. The application can repeatedly filter the circulating cooling water; the filtering assembly can be drawn out from the drain outlet; and the replacement or cleaning operation is relatively convenient.

Description

Technical Field

[0001] This invention relates to the field of welding machine technology, and in particular to a cooling water tank and a welding machine. Background Technology

[0002] For existing welding machines that use water-cooled circulation for heat dissipation, they are usually equipped with a water tank and a radiator. The water tank is used to provide circulating cooling water to the radiator. In order to achieve a filtration effect, a filter element is usually installed at the water inlet of the water tank. However, the filter element can only filter the water entering the water tank once. The cooling water cannot pass through the filter element a second time after passing through it, so the cooling water cannot be filtered repeatedly. Moreover, when it is necessary to replace or clean the filter element, the welding machine usually needs to be disassembled first to remove the filter element, which makes the operation of replacing or cleaning the filter element quite troublesome. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a cooling water tank that can repeatedly filter circulating cooling water, and the filter assembly can be pulled out from the drain outlet, making replacement or cleaning operations convenient.

[0004] The present invention also proposes a welding machine having the above-mentioned cooling water tank.

[0005] A cooling water tank according to a first aspect embodiment of the present invention comprises:

[0006] A water bucket has a cavity and a water inlet, a water outlet and a water outlet communicating with the cavity. A portion of the outer wall of the water bucket protrudes to form a water outlet, and the water outlet forms a recess on the inner wall of the water bucket.

[0007] A filter assembly includes a filter cartridge and a tube support that are detachably connected to each other. The end of the filter cartridge is inserted into the recess, and the recess and the filter cartridge are sealed by a sealing ring. The tube support passes through the drain outlet, and there is a gap between the outer wall of the tube support and the inner wall of the drain outlet. The filter assembly can enter or leave the cavity through the drain outlet.

[0008] A drain cover is detachably connected to the drain outlet to open or close the drain outlet.

[0009] The cooling water tank according to embodiments of the present invention has at least the following beneficial effects:

[0010] By setting the cooling water tank in this embodiment, the filter assembly can repeatedly filter the cooling water, because the cooling water will definitely pass through the outlet during each circulation process, thus improving the filtration effect.

[0011] When drainage is needed, simply remove the drain cap to open the drain outlet. The cooling water inside the water tank can be drained through the gap between the pipe support and the drain outlet. When the filter assembly needs to be replaced or cleaned, simply remove the drain cap to open the drain outlet. Then, you can pull out the entire filter assembly by holding the pipe support. After that, you can remove the filter cartridge to replace or clean it. The operation is quite convenient and does not require disassembling the cooling water tank.

[0012] In some embodiments, the filter cartridge includes a cylindrical shell, a filter screen, and a connecting cover. A boss is formed at the end of the cylindrical shell near the water outlet. An annular slot is formed between the outer peripheral wall of the boss and the inner peripheral wall of the cylindrical shell. The outer peripheral wall of the cylindrical shell is provided with a filter port communicating with the cavity. The filter screen has a cylindrical structure. An opening is provided at the end of the cylindrical shell away from the water outlet. The filter screen is inserted into the interior of the cylindrical shell through the opening and covers the filter port. One end of the filter screen is inserted into the annular slot. The boss is also provided with a water passage communicating the inner cavity of the filter screen and the water outlet. The connecting cover is detachably connected to the opening and is also detachably connected to the pipe support.

[0013] In some embodiments, the filter cartridge further includes a magnet, the connecting cover is provided with a mounting post, the filter screen is fitted around the outer periphery of the mounting post, the center of the boss is provided with a first groove, the end face of the mounting post facing the boss is provided with a second groove, one end of the magnet is inserted into the first groove, and the other end of the magnet is inserted into the second groove.

[0014] In some embodiments, the cross-section of the water passage is fan-shaped, and there are multiple water passages arranged at intervals around the axis of the filter cylinder.

[0015] In some embodiments, the filter screen is made of stainless steel.

[0016] In some embodiments, the connecting cover has an outer protruding ring, which is sleeved on the outer periphery of the opening and threadedly connected to the outer peripheral wall of the opening. The outer peripheral wall of the connecting cover is provided with a threaded hole, and the outer peripheral wall of the tube support is provided with a through hole. A screw is threadedly connected to the threaded hole, and the screw passes through the through hole.

[0017] In some embodiments, the outer wall of the drain outlet forms an annular flange, and the drain cover is threadedly connected to the flange.

[0018] In some embodiments, the interior of the pipe support is formed with a drainage channel communicating with the drain outlet, and the outer peripheral wall of the pipe support is provided with a water passage hole communicating with the drainage channel and the cavity.

[0019] In some embodiments, the cooling water tank further includes a chassis, with a portion of the water tank located outside the chassis, and the drain outlet and the drain cover located outside the chassis; or, the water tank is entirely located inside the chassis.

[0020] A welding machine according to a second aspect embodiment of the present invention includes

[0021] The cooling water tank described in the first aspect embodiment.

[0022] The welding machine according to the embodiments of the present invention, having included the cooling water tank of the first aspect embodiment, has at least the above-mentioned beneficial effects, which will not be repeated here.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 This is a schematic diagram of the structure of a cooling water tank according to some embodiments of the present invention;

[0026] Figure 2 This is a cross-sectional view of a cooling water tank according to some embodiments of the present invention;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is an exploded view of the filter assembly of a cooling water tank according to some embodiments of the present invention;

[0029] Figure 5 This is a cross-sectional view of the connection cover of the filter assembly of a cooling water tank according to some embodiments of the present invention;

[0030] Figure 6 This is a schematic diagram of the outer shell of the filter assembly of the cooling water tank according to some embodiments of the present invention;

[0031] Figure 7 This is a cross-sectional view of the outer shell of the filter assembly of a cooling water tank according to some embodiments of the present invention;

[0032] Figure 8 This is a side view of the outer shell of the filter assembly of a cooling water tank according to some embodiments of the present invention;

[0033] Figure 9 This is a schematic diagram of the structure of a cooling water tank according to some embodiments of the present invention;

[0034] Figure 10This is a schematic diagram of the structure of a cooling water tank according to some embodiments of the present invention.

[0035] Figure label:

[0036] 1. Cooling water tank; 2. Chassis; 3. Heat exchanger; 4. Fan; 5. Water pump; 6. Electrical control box; 7. Cooling connection port;

[0037] 100 bucket, 110 cavity, 120 water inlet, 130 drain outlet, 140 spout, 150 recess, 160 flange, 170 return outlet;

[0038] Filter assembly 200, filter cartridge 210, cartridge shell 211, boss 2111, annular slot 2112, filter port 2113, opening 2114, first groove 2115, water passage 2116, filter screen 212, connecting cover 213, mounting post 2131, second groove 2132, outer protruding ring 2133, threaded hole 2134, pipe support 220, through hole 221, drainage channel 222, water passage hole 223, sealing ring 230, magnet 240, screw 250;

[0039] Drain cover 300. Detailed Implementation

[0040] Reference Figure 1 and Figure 2 as well as Figure 9 and Figure 10 As shown, a cooling water tank 1 according to an embodiment of the present invention is provided. The cooling water tank 1 includes a water tank 100, a filter assembly 200, and a drain cover 300. (Refer to...) Figure 1 and Figure 2 As shown, the water tank 100 has a cavity 110 and a water inlet 120, a water return inlet 170, a water outlet 140, and a water drain outlet 130 communicating with the cavity 110. A water pump injects and extracts cooling water from inside the water tank 100. After heat exchange, the cooling water returns to the water tank 100 through the water return inlet 170, thus forming a circulating heat dissipation process. The water inlet 120 is used for users to add water, and the water drain outlet 130 is used for users to drain all the cooling water from the water tank 100. A drain cover 300 is detachably connected to the drain outlet 130, allowing the drain outlet 130 to be opened or closed.

[0041] Reference Figure 2 and Figure 3As shown, specifically, a portion of the outer wall of the water tank 100 protrudes to form a water outlet 140, and the water outlet 140 forms a recess 150 on the inner wall of the water tank 100. The filter assembly 200 has a cylindrical structure and includes a filter cylinder 210 and a tube support 220 that are detachably connected to each other (e.g., screw connection, snap-fit ​​connection, or threaded connection). The end of the filter cylinder 210 is inserted into the recess 150, thereby supporting one end of the filter assembly 200. The recess 150 and the filter cylinder 210 are sealed by a sealing ring 230 to prevent the cooling water in the water tank 100 from entering the water outlet 140 directly without being filtered by the filter cylinder 210. The tube support 220 passes through the drain outlet 130, thereby supporting the other end of the filter assembly 200 and ensuring that the entire filter assembly 200 remains stable under the impact of water flow. There is a gap between the outer wall of the tube support 220 and the inner wall of the drain outlet 130, allowing the filter assembly 200 to enter or exit the cavity 110 through the drain outlet 130.

[0042] The core idea of ​​the cooling water tank 1 proposed in this embodiment is to change the filtration function from "inlet one-time filtration" to "outlet circulating filtration", and fundamentally optimize the maintenance method of the filter component 200. The position layout of the water inlet 120, water return 170, water outlet 140 and water drain 130 has also been optimized to form a scientific water flow circulation path, ensuring that all cooling water in the water tank 100 can effectively participate in circulation and filtration.

[0043] By configuring the cooling water tank 1 in this embodiment, the filter assembly 200 can repeatedly filter the cooling water. Since the cooling water will inevitably pass through the outlet 140 during each circulation process, the filtration effect is improved. The flow direction of the cooling water can be referenced. Figure 3 The arrow points in the direction of the filter. This continuous and repeated filtration mechanism can dynamically remove tiny particles constantly generated in the circulation system, maintaining the high purity of the cooling water for a long time, thereby ensuring that the heat dissipation system always operates at its optimal state.

[0044] Furthermore, when drainage is required, the drain cap 300 can be removed to open the drain outlet 130, allowing the cooling water inside the water tank 100 to drain through the gap between the pipe support 220 and the drain outlet 130. When the filter assembly 200 needs to be replaced or cleaned, the drain cap 300 can be removed to open the drain outlet 130. Then, the entire filter assembly 200 can be pulled out of the cavity 110 by holding the pipe support 220. The filter cartridge 210 can then be removed for replacement or cleaning. The operation is quite convenient, without the need to disassemble the cooling water tank 1 or the various parts inside the welding machine. The entire process can be completed by hand without any special tools, which contrasts sharply with the complex operation of traditional designs that require disassembling the cooling water tank 1 or the welding machine casing, greatly reducing the maintenance threshold.

[0045] In some embodiments, the outlet 140 and the drain 130 can be located at the same horizontal level, allowing the filter assembly 200 to be horizontally inserted into the drain 130, thus providing better support for the filter assembly 200. This layout has significant engineering advantages. First, in the direction of gravity, the weight of the elongated filter assembly 200 is evenly borne by the support points at both ends (recess 150 and tube support 220), avoiding deformation or stress concentration under long-term gravity that may be caused by tilted installation. Second, horizontal installation simplifies the installation process; the user only needs to push it in or pull it out horizontally, resulting in better operation and easier alignment. Furthermore, it is more beneficial for the water flow organization within the water tank 100, forming a stable top-down or bottom-up convection, allowing the water to flow more evenly to the perimeter of the horizontally positioned filter cylinder 210, thereby increasing the effective utilization area of ​​the filter screen 212.

[0046] In some other embodiments, the filter cylinder 210 can be a cylindrical filter structure, with a filter screen on the outer peripheral wall of the filter cylinder 210, and the cooling water in the cavity 110 can only enter the water outlet 140 after passing through the filter screen 212.

[0047] Reference Figures 3 to 7 As shown, in some embodiments, the filter cartridge 210 includes a cylindrical shell 211, a filter screen 212, and a connecting cover 213. A boss 2111 is formed at the end of the cylindrical shell 211 near the water outlet 140. The boss 2111 is located inside the cylindrical shell 211 and is integral with it. An annular slot 2112 is formed between the outer peripheral wall of the boss 2111 and the inner peripheral wall of the cylindrical shell 211. The outer peripheral wall of the cylindrical shell 211 is provided with a filter port 2113 communicating with the cavity 110. The filter screen... 212 is a cylindrical structure. The end of the outer shell 211 facing away from the water outlet 140 has an opening 2114. The filter screen 212 is inserted into the interior of the outer shell 211 through the opening 2114 and covers the filter port 2113. One end of the filter screen 212 is inserted into the annular slot 2112. The boss 2111 is also provided with a water passage 2116 connecting the inner cavity of the filter screen 212 and the water outlet 140. The connecting cover 213 is detachably connected to the opening 2114. The connecting cover 213 is also detachably connected to the pipe support 220.

[0048] In this embodiment, the filter cartridge 210 is easy to assemble and disassemble. During assembly, the filter screen 212 is first inserted into the inner shell 211 of the cartridge body through the opening 2114. One end of the filter screen 212 is inserted into the annular slot 2112, which positions the filter screen 212 to prevent it from moving around. Then, the connecting cover 213 is placed on top to close the opening 2114, thereby fixing the position of the filter screen 212. At the same time, the filter screen 212 can separate the filter port 2113 from the cavity of the outer shell 211, ensuring that the cooling water must pass through the filter screen 212 before entering the outlet 140, thus guaranteeing a good filtration effect.

[0049] In some embodiments, the filter screen 212 can be made of stainless steel. Stainless steel wire mesh has high strength and good toughness, and is not easily damaged or deformed under the continuous impact of water flow and the scrubbing during the cleaning process. Each time, the filter screen 212 only needs to be removed for cleaning, and it can be reused multiple times, reducing the cost of use.

[0050] It's important to explain that during prolonged operation of the welding machine, components within the cooling water circulation system, such as pipes, pump impellers, and heat exchanger fins, may accumulate metal shavings, scale, or other impurities due to minor wear or corrosion. These newly generated contaminants cannot be captured by the inlet filter and repeatedly flow through the system with the cooling water, easily adhering to the inner walls of the cooling water pipes, creating thermal resistance and severely impacting heat dissipation efficiency. Long-term accumulation can even cause blockages in the water system, leading to localized overheating. This can range from triggering a protective shutdown of the welding machine, disrupting production continuity, to burning out core power components, resulting in costly repairs and equipment downtime.

[0051] Based on this, refer to Figures 3 to 7 As shown, in some embodiments, the filter cartridge 210 further includes a magnet 240, the connecting cover 213 is provided with a mounting post 2131, the filter screen 212 is sleeved on the outer periphery of the mounting post 2131, the center of the boss 2111 is provided with a first groove 2115, the end face of the mounting post 2131 facing the boss 2111 is provided with a second groove 2132, one end of the magnet 240 is inserted into the first groove 2115, and the other end of the magnet 240 is inserted into the second groove 2132.

[0052] By incorporating magnet 240, impurities such as iron powder in the cooling water can be adsorbed, thereby enhancing the filtration effect. After the outer shell 211 and connecting cover 213 are fixed, magnet 240 is secured by the first groove 2115 and the second groove 2132, preventing the magnet 240 from wobbling freely. Furthermore, the axis of magnet 240 is parallel to the flow direction of the cooling water, minimizing resistance to the water flow. Placing magnet 240 at the center of the filter cylinder 210, with its axis parallel to the main flow direction, creates a flow field surrounding magnet 240. This effectively adsorbs flowing ferromagnetic particles, and its streamlined layout minimizes resistance to the overall water flow, achieving a perfect combination of physical and magnetic filtration for more comprehensive filtration capabilities.

[0053] Reference Figure 7 and Figure 8 As shown, in some embodiments, the cross-section of the water passage 2116 is fan-shaped, and there are multiple water passages 2116 arranged at intervals around the axis of the filter cylinder 210. This enhances the flowability of the cooling water, making the cooling water flow more smoothly.

[0054] Reference Figures 3 to 5 As shown, in some embodiments, the connecting cover 213 has an outer protruding ring 2133, which is fitted around the outer periphery of the opening 2114 and threadedly connected to the outer peripheral wall of the opening 2114, ensuring a sealing effect. The outer peripheral wall of the connecting cover 213 has a threaded hole 2134, and the outer peripheral wall of the pipe support 220 has a through hole 221. A portion of the connecting cover 213 extends into the pipe support 220, and a screw 250 is threadedly connected to the threaded hole 2134, passing through the through hole 221. This fixes the connecting cover 213 and the pipe support 220. This structure is relatively simple and easy to manufacture.

[0055] In some other embodiments, the connecting cover 213 and the outer shell 211 can also be detachably connected by a snap-fit ​​structure.

[0056] In some embodiments, the outer wall of the drain outlet 130 forms an annular flange 160, and the drain cover 300 is threadedly connected to the flange 160.

[0057] In some other embodiments, the connecting cover 213 and the tube support 220 can also be detachably connected by a snap-fit ​​structure.

[0058] Reference Figure 2 and Figure 4As shown, in some embodiments, a drainage channel 222 communicating with the drain outlet 130 is formed inside the tube support 220, and a water passage hole 223 communicating with the drainage channel 222 and the cavity 110 is provided on the outer peripheral wall of the tube support 220. During drainage, cooling water can be discharged through the water passage hole 223 and the drainage channel 222, and is no longer limited to the gap between the tube support 220 and the drain outlet 130, thus improving the drainage rate.

[0059] Reference Figure 9 and Figure 10 As shown, this embodiment also provides a cooling water tank 1, including the water tank 100, the filter assembly 200, the casing 2, the heat exchanger 3, the fan 4, and the water pump 5 as described in the above embodiment. The water tank 100, the filter assembly 200, the heat exchanger 3, the fan 4, and the water pump 5 are all arranged inside the casing 2. The inlet of the water pump 5 is connected to the outlet 140. Two cooling connection ports 7 are provided at the front of the casing 2. One cooling connection port 7 is used to connect to the welding torch cooling device. This cooling connection port 7 is connected to the outlet of the water pump 5 through a pipe. The other cooling connection port 7 is connected to the return water port 170 through a pipe. This pipe also passes through the heat exchanger 3 to achieve heat exchange. The water pump 5 is used to pump the cooling water in the water tank 100 to the welding torch cooling device (the welding torch cooling device can be configured as a water-cooled pipe wrapped around the outside of the welding torch) to cool the welding torch. After the cooling water is heated, it is dissipated through the heat exchanger 3. The fan 4 can remove the heat from the heat exchanger 3. The cooled water returns to the inside of the water tank 100 through the return port 170. The heat exchanger 3 can be configured as a heat dissipation coil or fin structure. Since the filter assembly 200 can be removed from the drain port 130, the filter assembly 200 can be replaced or cleaned without disassembling the casing 2, which is more convenient. In some embodiments, an electrical control box 6 is also provided below the heat exchanger 3. The electrical control box 6 is used to install the electrical control board of the water pump 5. Since the heat exchanger 3 is close to the electrical control box 6, the heat exchanger 3 can also dissipate heat from the internal electrical control board.

[0060] like Figure 9 As shown, in some embodiments, the water tank 100 can be completely located inside the housing 2. A hinged door (such as a hinged door or sliding cover) can be provided on the outer wall of the housing 2 to expose or cover the drain cover 300. By opening the hinged door, the drain cover 300 can be exposed, allowing operation on the drain cover 300 to drain water or remove the filter assembly 200. Alternatively, an opening can be directly provided on the housing 2 to avoid the drain cover 300, thus exposing the drain cover 300.

[0061] like Figure 10As shown, in some other embodiments, a portion of the structure of the water tank 100 is located outside the chassis 2, such that the water inlet 120, the drain outlet 130, and the drain cover 300 are also located outside the chassis 2. This facilitates operation of the drain cover 300 and the water filling process. Furthermore, placing most of the water tank 100 outside the chassis 2 overcomes the limitation imposed by the chassis 2 on the capacity of the water tank 100, thereby increasing the capacity of the water tank 100 without changing the dimensions of the chassis 2.

[0062] This embodiment also provides a welding machine, which includes the cooling water tank 1 of the above embodiment. The cooling water tank 1 is a separate module that provides cooling water to the welding gun cooling device to achieve water cooling heat dissipation. The filter component 200 can be removed from the cooling water tank 1 from the drain port 130, which makes it convenient to replace or clean the filter component 200 without disassembling the internal structure of the welding machine or the cooling water tank 1.

[0063] Examples of the embodiments described above are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described above with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention.

[0064] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0065] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0066] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0067] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A cooling water tank, characterized in that, include: A water bucket has a cavity and a water inlet, a water outlet and a water outlet communicating with the cavity. A portion of the outer wall of the water bucket protrudes to form a water outlet, and the water outlet forms a recess on the inner wall of the water bucket. A filter assembly includes a filter cartridge and a tube support that are detachably connected to each other. The end of the filter cartridge is inserted into the recess, and the recess and the filter cartridge are sealed by a sealing ring. The tube support passes through the drain outlet, and there is a gap between the outer wall of the tube support and the inner wall of the drain outlet. The filter assembly can enter or leave the cavity through the drain outlet. A drain cover is detachably connected to the drain outlet to open or close the drain outlet; The filter cartridge includes a cylindrical shell, a filter screen, and a connecting cover. A boss is formed at the end of the cylindrical shell near the water outlet. An annular slot is formed between the outer peripheral wall of the boss and the inner peripheral wall of the cylindrical shell. The outer peripheral wall of the cylindrical shell has a filter port communicating with the cavity. The filter screen is cylindrical. An opening is provided at the end of the cylindrical shell away from the water outlet. The filter screen is inserted into the interior of the cylindrical shell through the opening and covers the filter port. One end of the filter screen is inserted into the annular slot. The boss also has a water passage connecting the inner cavity of the filter screen and the water outlet. The connecting cover is detachably connected to the opening and is also detachably connected to the pipe support. The filter cartridge also includes a magnet. The connecting cover has a mounting post. The filter screen is fitted around the outer periphery of the mounting post. A first groove is provided at the center of the boss. A second groove is provided on the end face of the mounting post facing the boss. One end of the magnet is inserted into the first groove, and the other end of the magnet is inserted into the second groove.

2. The cooling water tank according to claim 1, characterized in that, The cross-section of the water passage is fan-shaped, and there are multiple water passages arranged at intervals around the axis of the filter cylinder.

3. The cooling water tank according to claim 1, characterized in that, The filter screen is made of stainless steel.

4. The cooling water tank according to claim 1, characterized in that, The connecting cover has an outer protruding ring, which is sleeved on the outer periphery of the opening and threadedly connected to the outer peripheral wall of the opening. The outer peripheral wall of the connecting cover is provided with a threaded hole, and the outer peripheral wall of the tube support is provided with a through hole. A screw is threadedly connected to the threaded hole, and the screw passes through the through hole.

5. The cooling water tank according to claim 1, characterized in that, The outer wall of the drain outlet forms an annular flange, and the drain cover is threadedly connected to the flange.

6. The cooling water tank according to claim 1, characterized in that, The interior of the pipe support has a drainage channel that communicates with the drain outlet, and the outer peripheral wall of the pipe support has a water passage hole that connects the drainage channel and the cavity.

7. The cooling water tank according to claim 1, characterized in that, The cooling water tank also includes a chassis, with a portion of the water tank located outside the chassis, and the drain outlet and the drain cover located outside the chassis, or the water tank being completely located inside the chassis.

8. A welding machine, characterized in that, Includes the cooling water tank as described in any one of claims 1 to 7.

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