Cooling system of electric welding machine

Abstract

The utility model provides an electric welding machine cooling system using a cooling medium for cooling. The electric welding machine cooling system comprises a cooling pipeline, an electric welding machine, a cooling device and a circulating pump. The cooling pipeline is provided with an inlet section, a cooling section, an outlet section and a heat flow bypass section which are communicated with one another; the inlet end of the heat flow bypass section communicates with the outlet end of the inlet section, the outlet end of the heat flow bypass section communicates with the inlet end of the outlet section, and part of the cooling medium in the inlet section can enter the outlet section through the heat flow bypass section; the electric welding machine is arranged on the introduction section and can exchange heat with the cooling medium in the introduction section; the cooling device is arranged on the cooling section and can cool the cooling medium flowing through the cooling section; the circulating pump outlet section is communicated with the inlet section through a circulating pump; and the circulating pump can extract the cooling medium in the outlet section and convey the cooling medium to the inlet section, so that the cooling medium in the outlet section can also exchange heat with the electric welding machine. The electric welding machine cooling system can reduce the cooling intensity of the electric welding machine.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, specifically to a cooling system for an electric welding machine. Background Technology

[0002] In related technologies, the windings and iron core inside a welding machine generate a large amount of heat during operation. Therefore, a matching welding machine cooling system is needed to transfer this heat. Fixed-frequency welding machine cooling systems typically use liquid cooling to dissipate heat from the inside of the welding machine. After absorbing heat inside the welding machine, the coolant needs to be cooled again by a cooling device so that it can be circulated back into the welding machine to absorb heat. During this process, when the welding machine's heat generation decreases due to a reduction in load, the fixed-frequency welding machine cooling system struggles to reduce its cooling power, resulting in an excessively low operating temperature and affecting the welding effect. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a welding machine cooling system that can reduce the cooling intensity of the welding machine, thereby reducing the impact on the welding effect.

[0004] According to a first aspect of the present invention, a welding machine cooling system utilizes a cooling medium for cooling, comprising:

[0005] A cooling pipeline has an inlet section, a cooling section, an outlet section, and a hot flow bypass section; the inlet section, the cooling section, and the outlet section are connected in sequence; the inlet end of the hot flow bypass section is connected to the outlet end of the inlet section, and the outlet end of the hot flow bypass section is connected to the inlet end of the outlet section; a portion of the cooling medium in the inlet section can enter the outlet section through the hot flow bypass section.

[0006] An electric welding machine is installed in the inlet section and is capable of exchanging heat with the cooling medium within the inlet section;

[0007] A cooling device is provided in the cooling section and is capable of cooling the cooling medium flowing through the cooling section;

[0008] A circulating pump connects the outlet section to the inlet section; the circulating pump can draw the cooling medium in the outlet section and deliver it to the inlet section so that the cooling medium in the outlet section can exchange heat with the welding machine.

[0009] The welding machine cooling system according to this utility model embodiment has at least the following beneficial effects: the circulating pump draws the cooling medium cooled by the cooling device into the inlet section; the cooling medium absorbs the heat of the welding machine after flowing through it to cool the welding machine; the cooling medium flowing through the welding machine continues to flow into the cooling section and is cooled down, and is then drawn back into the inlet section by the circulating pump for the next round of cooling. Because some of the cooling medium can enter the inlet section through the hot flow bypass section and mix with the liquid cooling medium flowing through the cooling section, the temperature of the cooling medium re-entering the inlet section increases, thereby reducing the efficiency of heat absorption when the cooling medium re-flows through the welding machine, reducing the cooling intensity on the welding machine, and thus reducing the impact on the welding effect of the welding machine.

[0010] According to some embodiments of the present invention, the cooling medium is made of a gas-liquid phase change material; at least part of the liquid cooling medium becomes gaseous after flowing through the welding machine; part of the gaseous cooling medium in the inlet section can enter the outlet section through the hot flow bypass section; the cooling device can cool the gaseous cooling medium flowing through the cooling section into a liquid state.

[0011] According to some embodiments of the present invention, the welding machine cooling system further includes a storage tank having a storage cavity; the storage cavity is connected to the inlet end of the inlet section and is capable of receiving the cooling medium of the inlet section, and the storage cavity is also connected to the outlet end of the outlet section; the circulating pump is capable of drawing the liquid cooling medium in the storage tank and delivering it to the inlet section.

[0012] According to some embodiments of the present invention, the storage tank includes a feeding channel and a discharging channel, the outlet end of the feeding channel is connected to the inlet end of the inlet section; the inlet end of the discharging channel is connected to the outlet end of the outlet section, and the outlet end of the discharging channel is higher than the inlet end of the feeding channel.

[0013] According to some embodiments of this utility model, the welding machine, the cooling device, the circulating pump, and the storage tank are all sealed and connected to the cooling pipeline.

[0014] According to some embodiments of the present invention, the storage tank has an air outlet, and the storage cavity is connected to the outside through the air outlet.

[0015] According to some embodiments of the present invention, the storage tank includes a liquid level detection device disposed on the inner wall of the storage cavity. The liquid level detection device is configured to detect the liquid level of the cooling medium in the storage tank and to issue an alarm when the liquid level of the cooling medium in the storage tank is detected to be lower than the height of the inlet end of the discharge channel.

[0016] According to some embodiments of the present invention, the welding machine cooling system further includes a valve, which is disposed in the hot flow bypass section and is capable of adjusting the on / off state of the hot flow bypass section.

[0017] According to some embodiments of the present invention, the welding machine cooling system further includes a temperature sensor, which is capable of detecting the temperature of the liquid cooling medium in the cooling pipe; the valve signal is connected to the temperature sensor, and the valve opens when the temperature sensor detects a temperature lower than a preset temperature.

[0018] According to some embodiments of the present invention, the temperature sensor is disposed in the inlet section and located on the side closer to the inlet end of the inlet section than the welding machine, and is capable of detecting the temperature of the liquid cooling medium flowing through the inlet section.

[0019] Additional aspects and advantages of this 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

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a connection diagram of the cooling system of a welding machine according to some embodiments of this utility model;

[0022] Figure 2 This is a connection diagram of the cooling system of a welding machine according to other embodiments of this utility model;

[0023] Figure 3 This is a schematic diagram of a liquid storage tank according to some embodiments of the present invention.

[0024] Figure label:

[0025] Inlet section 110, cooling section 120, outlet section 130, hot flow bypass section 140;

[0026] Welding machine inlet 210, welding machine outlet 220;

[0027] Cooling device 300;

[0028] Circulation pump 400;

[0029] Storage tank 500, storage cavity 510, feed pipe 520, feed channel 521, discharge pipe 530, discharge channel 531, vent 540, safety valve 550, liquid level detection device 560;

[0030] Valve 600;

[0031] Temperature sensor 700. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments 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 below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 limitations on this utility model.

[0034] In the description of this utility model, "several" means one or more, "multiple" 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.

[0035] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0036] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] Please refer to Figure 1 As shown, this utility model discloses a welding machine cooling system that utilizes a cooling medium, including a cooling pipeline, a welding machine, a cooling device 300, and a circulating pump 400.

[0038] The cooling pipeline has an inlet section 110, a cooling section 120, an outlet section 130, and a hot flow bypass section 140; the inlet section 110, cooling section 120, and outlet section 130 are connected in sequence; the inlet end of the hot flow bypass section 140 is connected to the outlet end of the inlet section 110, and the outlet end of the hot flow bypass section 140 is connected to the inlet end of the outlet section 130; part of the cooling medium in the inlet section 110 can enter the outlet section 130 through the hot flow bypass section 140; the welding machine is installed in the inlet section 110 and can exchange heat with the cooling medium in the inlet section 110; the cooling device 300 is installed in the cooling section 120 and can cool the cooling medium flowing through the cooling section 120; the outlet section 130 is connected to the inlet section 110 through a circulating pump 400; the circulating pump 400 can draw the cooling medium in the outlet section 130 and transport it to the inlet section 110.

[0039] Please refer to Figure 1 As shown, where Figure 1 The welding machine is not shown; only the welding machine inlet 210 and welding machine outlet 220, which are connected to the internal channels of the welding machine, are shown. The welding machine cooling system circulates and transports the cooling medium through cooling pipes to cool the welding machine. The cooling medium in the inlet section 110 enters the welding machine through the welding machine inlet 210 and exchanges heat with the internal structure of the welding machine. The heat exchange with the internal structure of the welding machine causes the cooling medium to become high temperature. The high temperature cooling medium then flows from the welding machine outlet 220 into another part of the inlet section 110. Since the inlet end of the cooling section 120 and the inlet end of the hot flow bypass section 140 are both connected to the outlet end of the inlet section 110, a part of the high temperature cooling medium in the inlet section 110 flows into the cooling section 120, and another part of the high temperature cooling medium in the inlet section 110 flows into the hot flow bypass section 140.

[0040] The cooling device 300 can cool the high-temperature cooling medium flowing through the cooling section 120. The cooling medium cooled in the cooling section 120 can flow into the outlet section 130; since the circulating pump 400 can draw the cooling medium in the outlet section 130 and deliver it to the inlet section 110 so that the cooling medium in the outlet section 130 can exchange heat with the welding machine, the cooling medium cooled by the cooling device 300 can flow back into the inlet section 110 and re-enter the welding machine through the welding machine inlet 210 to exchange heat with the internal structure of the welding machine.

[0041] In existing technologies, for a stable, fixed-frequency welding machine cooling system, the load and corresponding heat generation of the welding machine remain constant, and the cooling device 300 also maintains a constant power. Since the cooling medium flowing through the welding machine also flows through the cooling device 300 and, after being cooled by the cooling device 300, flows back into the welding machine to cool its interior, the cooling effect of the cooling medium remains constant when the heat absorbed by the welding machine is equal to the heat released by the cooling device 300. However, when the welding machine's heat generation decreases due to a reduced load, the cooling power of the fixed-frequency cooling device 300 exceeds the heating power, causing the welding machine's operating temperature to drop, which in turn affects the welding effect.

[0042] In the welding machine cooling system of this utility model, since the two ends of the hot flow bypass section 140 are respectively connected to the inlet section 110 and the outlet section 130, the high-temperature cooling medium entering the hot flow bypass section 140 from the inlet section 110 can directly flow into the outlet section 130. The cooling medium flowing from the cooling section 120 into the outlet section 130 mixes with the high-temperature cooling medium flowing from the hot flow bypass section 140 into the outlet section 130. When the cooling medium in the outlet section 130 is drawn by the circulating pump 400 and transported to the inlet section 110, the temperature of the cooling medium re-entering the inlet section 110 will be higher than the temperature of the cooling medium in the inlet section 110 the previous time. As a result, the temperature difference between the cooling medium re-entering the inlet section 110 and the internal structure of the welding machine will decrease, and the cooling effect on the welding machine will also decrease. Therefore, when the load of the welding machine decreases, the cooling effect of the welding machine cooling system on the welding machine will gradually decrease, and the working temperature of the welding machine will not be too low, thus ensuring the welding effect of the welding machine.

[0043] It should be noted that this utility model does not limit the specific configuration of the access section 110. In some embodiments, please refer to Figure 1 As shown, the inlet section 110 includes several parts. The internal piping structure of the welding machine defines a part of the inlet section 110, and the internal piping structure of the circulating pump 400 defines another part of the inlet section 110. The cooling medium located at one end of the inlet section 110 can flow sequentially through the circulating pump 400 and the welding machine. In other embodiments, a continuous pipe defines the entire inlet section 110, and the internal channel of the circulating pump 400 communicates with the opening at one end of the inlet section 110. The cooling medium located in the inlet section 110 can exchange heat with the internal structure of the welding machine through the pipe wall.

[0044] Further, please refer to Figure 2As shown, in some embodiments, the welding machine cooling system further includes a valve 600, which is located in the hot flow bypass section 140 and can regulate the opening and closing of the hot flow bypass section 140. When the valve 600 is open, part of the cooling medium in the inlet section 110 can enter the outlet section 130 through the hot flow bypass section 140 and mix with the cooled medium, increasing the temperature of the cooling medium and reducing the cooling intensity on the welding machine. When the valve 600 is closed, all the cooling medium in the inlet section 110 passes through the cooling section 120 and is cooled by the cooling device 300. In a fixed-frequency welding machine cooling system, the cooling effect of the cooling medium on the welding machine remains constant. Therefore, when the load of the welding machine is maintained at a certain level so that the heat absorbed by the welding machine is the same as the heat released by the cooling device 300, the welding machine cooling system can prevent the operating temperature of the welding machine from being too high or too low, thereby avoiding affecting the welding effect of the welding machine.

[0045] Regarding the specific adjustment method of valve 600, in some embodiments, valve 600 is equipped with a mechanical switch, and the operator can manually adjust the opening and closing of valve 600 to adjust the cooling effect of the welding machine cooling system.

[0046] Further, please refer to Figure 2 As shown, in some embodiments, the welding machine cooling system further includes a temperature sensor 700, which can detect the temperature of the liquid cooling medium in the cooling pipe; a valve 600 is signal-connected to the temperature sensor 700, and the valve 600 opens when the temperature sensor 700 detects a temperature lower than a preset temperature. When the welding machine cooling system is in a fixed-frequency state and the welding machine load decreases, the cooling power is greater than the heating power, and the temperature of the cooling medium will gradually decrease. Those skilled in the art can set the preset temperature according to the actual impact of the decrease in welding machine load on the welding effect. When the temperature of the cooling medium falls below the preset temperature due to the decrease in welding machine load, the valve 600 opens to allow some of the cooling medium to enter the inlet section 110 through the hot flow bypass pipe, thereby reducing the cooling intensity of the welding machine cooling system and thus reducing the impact on the welding effect.

[0047] Furthermore, for the specific location of the temperature sensor 700, please refer to [reference needed]. Figure 2As shown, the temperature sensor 700 is disposed in the inlet section 110 and located on the side closer to the inlet end of the inlet section 110 than the welding machine, and can detect the temperature of the liquid cooling medium flowing through the inlet section 110. With this design, since the temperature sensor 700 is positioned within the inlet section 110 closer to the inlet end than the welding machine, and the cooling medium flows from the inlet end of the inlet section 110 through the welding machine and from the outlet end of the inlet section 110 into the heat bypass section 140 and the cooling section 120, the temperature sensor 700 can directly sense the temperature of the cooling medium before heat exchange with the welding machine. Therefore, the placement of the temperature sensor 700 in the above design also facilitates those skilled in the art in setting the corresponding preset temperature, thereby further ensuring the stability of the welding torch's cooling effect.

[0048] Without departing from the inventive concept of this utility model, the cooling system for the welding machine protected by this utility model does not limit the material of the cooling medium. In some embodiments, the cooling medium is a liquid and remains liquid throughout its movement within the welding machine cooling system.

[0049] As a preferred embodiment, the cooling medium is made of a gas-liquid phase change material; at least a portion of the liquid cooling medium turns into a gaseous state after flowing through the welding machine; a portion of the gaseous cooling medium in the inlet section 110 can enter the outlet section 130 through the heat bypass section 140; the cooling device 300 can cool the gaseous cooling medium flowing through the cooling section 120 into a liquid state. With this embodiment, when a gas-liquid phase change material is used as the cooling medium, the welding machine cooling system can absorb more heat from the internal structure of the welding machine during the vaporization process of the cooling medium, and can also release more heat at the cooling device 300 during the liquefaction process of the cooling medium; the temperature change of the cooling medium is small during the vaporization and liquefaction processes, thus further maintaining the temperature difference between the cooling medium and the internal structure of the welding machine when absorbing heat, and further maintaining the temperature difference between the cooling medium and the heat exchange structure of the cooling device 300 when releasing heat, thereby further ensuring the stability of heat exchange.

[0050] It should be noted that the gaseous cooling medium flowing from the hot flow bypass section 140 into the outlet section 130 can also exchange heat with the liquid cooling medium flowing from the cooling section 120 into the outlet section 130, thereby increasing the temperature of the liquid cooling medium and reducing the temperature difference between the liquid cooling medium and the internal structure of the welding machine when the liquid cooling medium re-enters the internal structure of the welding machine for heat exchange, thus reducing the cooling intensity of the cooling medium on the welding machine.

[0051] Further, please refer to Figure 2 , Figure 3As shown, in some embodiments, the welding machine cooling system further includes a storage tank 500, which has a storage cavity 510. The storage cavity 510 is connected to the inlet end of the inlet section 110 and can receive the cooling medium from the inlet section 110. The storage cavity 510 is also connected to the outlet end of the outlet section 130. The circulation pump 400 can draw the cooling medium from the storage tank 500 and deliver it to the inlet section 110. With the above scheme, the storage tank 500 contains a certain amount of liquid cooling medium, and the circulation pump 400 can continuously draw the cooling medium from the storage tank 500 so that the cooling medium continuously cools the welding machine, increasing the stability of the welding machine cooling system in cooling the welding machine.

[0052] Further, please refer to Figure 2 , Figure 3 As shown, in some embodiments, the storage tank 500 includes a feed channel 521 and a discharge channel 531. The outlet end of the feed channel 521 is connected to the inlet end of the inlet section 110; the inlet end of the discharge channel 531 is connected to the outlet end of the outlet section 130, and the outlet end of the discharge channel 531 is higher than the inlet end of the feed channel 521 (i.e., Figure 3 The outlet end of the discharge channel 531 is located above the inlet end of the feed channel 521. Through this scheme, when the liquid level A of the liquid cooling medium contained in the storage chamber 510 is lower than the outlet end of the discharge channel 531, the liquid cooling medium in the storage chamber 510 will not flow back into the outlet section 130 due to liquid pressure. When the liquid level A of the liquid cooling medium contained in the storage chamber 510 is higher than the inlet end of the feed channel 521, the circulating pump 400 can directly extract the liquid cooling medium located at the inlet end of the feed channel 521. The gaseous cooling medium will not participate in the cooling of the welding machine, thus ensuring the cooling effect on the welding machine and enhancing the stability of the welding machine cooling system.

[0053] On the other hand, the gaseous cooling medium contained in the storage tank 500 can continuously exchange heat with the liquid cooling medium in the storage tank 500, continuously increasing the temperature of the liquid cooling medium and reducing the cooling intensity of the welding machine cooling system.

[0054] Further, please refer to Figure 3 As shown, in some embodiments, the storage tank 500 has a vent 540, and the storage cavity 510 is connected to the outside through the vent 540. With this design, the gaseous cooling medium entering the storage cavity 510 can flow out through the vent 540, thus preventing the gaseous cooling medium from heating the liquid cooling medium inside the storage cavity 510. Furthermore, releasing the gaseous cooling medium from the vent 540 also prevents excessive pressure inside the storage cavity 510, avoiding malfunctions in the welding machine's cooling system.

[0055] In some preferred embodiments, the storage tank 500 further includes a safety valve 550, which is detachably connected to the inner wall of the storage cavity 510 and closes the vent 540. Operators can choose whether to remove the safety valve 550 based on the operational requirements of the welding machine cooling system.

[0056] Furthermore, in some embodiments, the welding machine, cooling device 300, circulating pump 400, and storage tank 500 are all sealed to the cooling pipeline. Through this design, the cooling medium in the inlet section 110, cooling section 120, hot flow bypass section 140, outlet section 130, and storage chamber is less likely to leak to the outside from the connections between the welding machine, cooling device 300, circulating pump 400, storage tank 500, and cooling pipeline. The welding machine cooling system is less prone to liquid shortages or leaks, and the risk of the cooling medium freezing and cracking the welding machine cooling system in low-temperature working environments is reduced, thereby improving system reliability.

[0057] To help those skilled in the art further understand the specific form of the sealing connection of this utility model, the following description is provided through different embodiments.

[0058] Please refer to Figure 2 As shown, taking the connection between the cooling pipe and the storage tank 500 as an example, in some embodiments, the welding machine cooling system includes a seal defining the connection between the pipe extending from the inlet section 110 and the storage tank 500. The seal is disposed at the connection between the pipe defining the inlet section 110 and the storage tank 500. The seal in the above embodiments can be commonly used waterproof rubber rings, waterproof tape, or waterproof adhesive, etc. Without departing from the inventive concept of this utility model, seals can also be provided at the connection between the welding machine and the cooling pipe, the connection between the circulating pump 400 and the cooling pipe, the connection between the cooling device 300 and the cooling pipe, and the connection between different pipes within the cooling pipe, to reduce the possibility of liquid shortage or leakage in the welding machine cooling system.

[0059] It should be noted that, as mentioned above, in some embodiments, a continuous pipe forms an inlet section 110, and the cooling medium located in the inlet section 110 can exchange heat with the internal structure of the welding machine through the pipe wall. In this case, the cooling pipe does not need to be equipped with an additional seal with the welding machine.

[0060] The welding machine cooling system includes seals located at the connections between the cooling pipes, the welding machine, the cooling device 300, the circulating pump 400, and the storage tank 500. These seals prevent the cooling medium within the inlet section 110, cooling section 120, outlet section 130, hot flow bypass section 140, and storage chamber 510 from leaking to the outside. This design reduces the likelihood of liquid shortages or leaks in the welding machine cooling system and lowers the risk of the cooling medium freezing and cracking in low-temperature operating environments, thereby improving system reliability.

[0061] Further, please refer to Figure 3 As shown, in some embodiments, the storage tank 500 includes a liquid level detection device 560, which is disposed on the inner wall of the storage cavity 510. The liquid level detection device 560 is configured to detect the liquid level A of the cooling medium in the storage tank 500 and to issue an alarm when the liquid level of the cooling medium in the storage tank 500 is lower than the height of the inlet end of the discharge channel 531. With this solution, when the welding machine cooling system is in operation, the liquid level detection device 560 can promptly alert the operator when the liquid level A of the cooling medium in the storage tank 500 is lower than the height of the inlet end of the discharge channel 531, facilitating adjustments to the welding machine cooling system.

[0062] 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. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A cooling system for an electric welding machine, utilizing a cooling medium, characterized in that, include: A cooling pipeline has an inlet section, a cooling section, an outlet section, and a hot flow bypass section; the inlet section, the cooling section, and the outlet section are connected in sequence; the inlet end of the hot flow bypass section is connected to the outlet end of the inlet section, and the outlet end of the hot flow bypass section is connected to the inlet end of the outlet section; a portion of the cooling medium in the inlet section can enter the outlet section through the hot flow bypass section. An electric welding machine is installed in the inlet section and is capable of exchanging heat with the cooling medium within the inlet section; A cooling device is provided in the cooling section and is capable of cooling the cooling medium flowing through the cooling section; A circulating pump connects the outlet section to the inlet section; the circulating pump can draw the cooling medium in the outlet section and deliver it to the inlet section so that the cooling medium in the outlet section can exchange heat with the welding machine.

2. The welding machine cooling system according to claim 1, characterized in that, The cooling medium is made of a gas-liquid phase change material; at least part of the liquid cooling medium becomes gaseous after flowing through the welding machine; part of the gaseous cooling medium in the inlet section can enter the outlet section through the heat flow bypass section; the cooling device can cool the gaseous cooling medium flowing through the cooling section into a liquid state.

3. The welding machine cooling system according to claim 2, characterized in that, The welding machine cooling system also includes a storage tank, which has a storage cavity; the storage cavity is connected to the inlet end of the inlet section and is able to receive the cooling medium in the inlet section, and the storage cavity is also connected to the outlet end of the outlet section; the circulating pump is able to draw the liquid cooling medium in the storage tank and deliver it to the inlet section.

4. The welding machine cooling system according to claim 3, characterized in that, The storage tank includes a feeding channel and a discharging channel. The outlet end of the feeding channel is connected to the inlet end of the inlet section. The inlet end of the discharging channel is connected to the outlet end of the outlet section. The outlet end of the discharging channel is higher than the inlet end of the feeding channel.

5. The welding machine cooling system according to claim 4, characterized in that, The welding machine, the cooling device, the circulating pump, and the storage tank are all sealed and connected to the cooling pipeline.

6. The welding machine cooling system according to claim 4, characterized in that, The storage tank has an air outlet, and the storage cavity is connected to the outside through the air outlet.

7. The welding machine cooling system according to claim 4, characterized in that, The storage tank includes a liquid level detection device disposed on the inner wall of the storage cavity. The liquid level detection device is configured to detect the liquid level of the cooling medium in the storage tank and to issue an alarm when the liquid level of the cooling medium in the storage tank is detected to be lower than the height of the inlet end of the discharge channel.

8. The welding machine cooling system according to claim 1, characterized in that, The welding machine cooling system also includes a valve, which is located in the hot flow bypass section and can adjust the opening and closing of the hot flow bypass section.

9. The welding machine cooling system according to claim 8, characterized in that, The welding machine cooling system also includes a temperature sensor, which can detect the temperature of the liquid cooling medium in the cooling pipe; the valve signal is connected to the temperature sensor, and the valve opens when the temperature sensor detects a temperature lower than a preset temperature.

10. The welding machine cooling system according to claim 9, characterized in that, The temperature sensor is disposed in the inlet section and located on the side closer to the inlet end of the inlet section than the welding machine, and is capable of detecting the temperature of the liquid cooling medium flowing through the inlet section.

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