Water pump, water cooling system, and welding machine

Abstract

A water pump, a water cooling system, and a welding machine, relating to the technical field of welding machines. The water pump comprises a housing assembly, a rotor assembly, and a stator, wherein the housing assembly has a water inlet, a water outlet, and a drainage channel; the housing assembly comprises a casing, a pump cover, and a volute; the pump cover is connected to the casing; a water pumping cavity is formed in the pump cover; a water inlet and a water outlet are formed on an outer side wall of the pump cover and are both in communication with the water pumping cavity; the volute is located inside the casing, the volute is cylindrical and has an inner hole forming a rotor cavity, and a stator cavity is formed between the volute and the casing; the rotor assembly comprises a rotor and an impeller, and the impeller is rotatably arranged in the water pumping cavity; the drainage channel is configured to allow at least part of the liquid in the water pumping cavity to flow through the interior of the casing and / or the volute and to be discharged out of the water pump via a drainage port; and the drainage port is located on the outer side wall of the housing assembly on the side away from the pump cover, and the drainage port is connected to a water tank by means of a bypass pipe. The structure of the water pump can effectively reduce the probability of burnout of a water pump electric motor and improve the operation reliability of the water pump.

Description

Water pumps, water cooling systems and welding machines Technical Field

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

[0002] In related technologies, welding machines used for arc welding, such as argon arc welding, generate high temperatures at the welding torch during the welding process. Currently, welding machines generally use water cooling to cool the welding torch, that is, a water pump delivers water to the welding torch, and the internal cooling water circuit of the welding torch is circulated to cool the inside of the welding torch. During the use of the welding machine, if the pipeline between the water pump and the welding torch experiences high pressure or blockage, or if the internal cooling water circuit of the welding torch becomes blocked, the water pump will stall, causing the water pump motor to burn out and resulting in welding machine shutdown.

[0003] Therefore, how to effectively reduce the probability of water pump motor burning out when welding machines are used under complex working conditions is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a water pump, a water cooling system, and a welding machine. By adding a drainage channel that flows through its interior, at least a portion of the liquid sucked in by the water pump is returned to the water tank through the drain outlet of the drainage channel, which can effectively reduce the probability of the water pump motor burning out.

[0005] A water pump according to a first aspect of this application includes a welding machine having a water tank, characterized in that it comprises: a housing assembly having an inlet, an outlet, and a drainage channel; the housing assembly includes a casing, a pump cover, and a volute; the pump cover is connected to the casing; a pumping chamber is formed within the pump cover; the inlet and the outlet are formed on the outer side wall of the pump cover and respectively communicate with the pumping chamber; the volute is located inside the casing; the volute is cylindrical and its inner hole forms a rotor cavity; a fixed space is formed between the volute and the casing. The pump housing includes: a sub-cavity; a rotor assembly comprising a rotor and an impeller, the rotor being rotatably disposed within the rotor cavity and capable of driving the impeller to rotate, the impeller being rotatably disposed within the pump water cavity; a stator installed within the stator cavity; wherein the drainage channel is configured to allow at least a portion of the liquid in the pump body cavity to flow through the interior of the housing and / or the volute and be discharged outside the pump through a drain outlet, the drain outlet being located on the outer side wall of the housing assembly opposite to the pump cover, and the drain outlet being connected to the water tank via a bypass pipe.

[0006] The water pump according to the embodiments of this application has at least the following beneficial effects:

[0007] By adding a drainage channel to the water pump, the drainage channel is configured to allow at least a portion of the liquid drawn in by the pump's inlet to flow through the pump's interior and then be discharged through the drainage outlet. The drainage outlet serves as a bypass channel to return the discharged liquid to the water tank via a bypass pipe. Therefore, when high pressure or blockage occurs in the pumping channel between the pump and the welding torch, or when blockage occurs inside the welding torch, the pump can use the bypass channel to return the drawn-in liquid to the water tank, effectively preventing pump stalling and thus reducing the likelihood of the pump motor burning out, thereby improving the pump's operational reliability. The drainage channel also removes heat generated by the pump motor, improving its performance and making it more energy-efficient. Furthermore, the drainage channel removes debris and other foreign objects from inside the pump motor, reducing operational malfunctions. In addition, during pump startup, residual gas inside can cause trapped gas, affecting the pump motor's starting efficiency. This embodiment uses a bypass channel to discharge residual gas, facilitating the pump motor's startup and allowing it to reach full load operation more quickly, thus improving the pump's working efficiency. The water cooling system in this embodiment can be used in manual welding machines, as well as automatic or semi-automatic welding machines.

[0008] According to some embodiments of the present invention, the two ends of the drainage channel are respectively connected to the pump water chamber and the drain outlet; and / or, the drain outlet is configured as a drain pipe connected to the rear end of the volute, the drain pipe extending to the outside of the housing; and / or, at least a portion of the structure of the heat dissipation channel is formed between the inner wall of the volute and the outer wall of the rotor; and / or, the minimum gap between the inner wall of the volute and the outer wall of the rotor is 1.3 mm to 1.4 mm.

[0009] According to some embodiments of the present invention, the water pump includes a housing assembly and an electrical control box for housing an electrical control board, the electrical control box being connected to the outer side of the peripheral wall of the housing, the electrical control board being connected to the stator via a cable; the drain outlet is configured to be connected to a drain pipe on the side of the volute opposite to the inlet.

[0010] According to some embodiments of the present invention, the drain pipe is disposed adjacent to the bottom of the volute; and / or, the axis of the drain pipe is parallel to the axis of the inlet and located below the axis of the inlet.

[0011] According to some embodiments of the present invention, the water pump includes a stator assembly, the stator assembly including the stator and a terminal block, the terminal block being located at one end of the stator near the drain outlet, the terminal block being annular and circumferentially arranged around the volute, and the drain pipe passing through the inner hole of the terminal block.

[0012] According to some embodiments of the present invention, a connecting seat is provided on the top of the housing, the connecting seat is provided with a sliding groove, one end of the sliding groove is provided with an opening, and slots communicating with the opening are respectively provided on the inner walls of opposite sides of the sliding groove; a plug-in seat is provided at the bottom of the electrical control box, the plug-in seat can be slidably disposed in the sliding groove through the opening, and plug plates are respectively provided on the opposite sides of the plug-in seat, the plug plates can be inserted into the slots; a fastening member is also provided at the bottom of the electrical control box, the fastening member can be fastened to the side of the connecting seat opposite to the opening.

[0013] According to some embodiments of the present invention, the rotor and impeller are fixedly connected, and the water pump further includes a central shaft supported on the housing assembly, with the rotor rotatably sleeved on the outside of the central shaft; or, the water pump further includes a central shaft fixedly connected to the rotor, the rotor and impeller are fixedly connected, the central shaft is supported on the housing assembly, and is rotatable relative to the housing assembly.

[0014] According to some embodiments of the present invention, a first support seat is provided at the end of the volute away from the pump cover, and a second support seat is provided on the inner side of the pump cover. The first support seat and the second support seat are arranged opposite to each other, and the two ends of the central shaft are respectively supported by the first support seat and the second support seat.

[0015] According to some embodiments of the present invention, the water inlet is configured as a water inlet pipe connected to the pump cover, and the water inlet pipe is provided with at least one sealing groove and a fixing groove in sequence along the direction close to the pump cover, and a sealing ring is installed in the sealing groove; the water pump further includes an adapter sleeved on the water inlet pipe, the adapter and the water inlet pipe are sealed and connected by the sealing ring, and the outer peripheral wall of the adapter is provided with at least one fixing hole adapted to the position of the fixing groove, and the fixing hole and the fixing groove are fixedly connected by bolts.

[0016] A water cooling system according to a second aspect of this application includes a water tank and a water pump as described in the above embodiments. The inlet of the water pump is configured to draw liquid from the water tank into the pump water chamber, the outlet of the water pump is configured to deliver liquid in the pump water chamber to a welding terminal, and the outlet of the water pump is configured to deliver liquid flowing through the drainage channel back to the water tank through the bypass pipe.

[0017] A water-cooling system according to a third aspect of this application is used for a welding machine, comprising: a water tank having a receiving cavity for containing liquid; a water pump having an inlet, an outlet, and a drain channel, wherein the inlet is connected to the receiving cavity and configured to draw liquid from the receiving cavity into the water pump, the outlet is configured to deliver the liquid drawn in by the inlet to a welding terminal, the drain channel is configured to allow at least a portion of the liquid drawn in by the inlet to flow through the interior of the water pump and be discharged from the water pump through the drain outlet, and the drain outlet is connected to the receiving cavity through a bypass pipe and delivers the liquid flowing through the drain channel back to the water tank.

[0018] According to some embodiments of the present invention, the water pump includes a stator and a rotor, and at least a portion of the drainage passage is formed between the stator and the rotor.

[0019] According to some embodiments of the present invention, the water pump further includes a housing assembly and an impeller. The housing assembly has a rotor cavity and a pumping cavity formed therein. The rotor is rotatably disposed within the rotor cavity and can drive the impeller to rotate. The impeller is rotatably disposed within the pumping cavity, and the pumping cavity is respectively connected to the inlet and the outlet. The housing assembly includes a casing, a pump cover, and a volute. The pump cover is connected to the casing, and the pumping cavity is formed within the pump cover. The inlet and the outlet are formed on the outer side wall of the pump cover. The volute is cylindrical and located inside the casing. The inner hole of the volute forms the rotor cavity. A stator cavity for mounting the stator is formed between the volute and the casing. The stator cavity and the rotor cavity are isolated by the volute. The drainage channel includes a connecting section and a heat dissipation section. The connecting section connects the pumping cavity and the rotor cavity. The heat dissipation section is formed between the stator and the rotor and connects the connecting section and the drain outlet.

[0020] According to some embodiments of the present invention, the front end of the volute has a flange extending radially to the housing, the volute and the housing being configured as an integrally formed part; and / or, the pump cover is sealed to the flange; and / or, the connecting section is formed between the flange and the sidewall of the impeller facing away from the inlet.

[0021] According to some embodiments of the present invention, the impeller has a recess at one end facing the water inlet, the inner peripheral wall of the recess has a first through hole, the inner side of the pump cover has a protrusion extending toward the recess, the protrusion is provided with at least one second through hole communicating with the water inlet, and at least a portion of the second through hole is located within the recess.

[0022] A welding machine according to a fourth aspect of this application includes a welding terminal and a water cooling system as described in the above embodiments, wherein the water cooling system is connected to the welding terminal via a pipeline.

[0023] Additional aspects and advantages of this application 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 this application. Attached Figure Description

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

[0025] Figure 1 is a schematic diagram of the structure of a water pump according to an embodiment of this application;

[0026] Figure 2 is an exploded view of a water pump according to an embodiment of this application;

[0027] Figure 3 is a cross-sectional view of a water pump according to an embodiment of this application;

[0028] Figure 4 is a schematic diagram of a water pump equipped with an electrical control box according to an embodiment of this application;

[0029] Figure 5 is another schematic diagram of a water pump equipped with an electrical control box according to an embodiment of this application;

[0030] Figure 6 is a schematic diagram of the structure of a welding machine according to another embodiment of this application;

[0031] Figure 7 is a schematic diagram of the structure of a water cooling system according to another embodiment of this application;

[0032] Figure 8 is a schematic diagram of the structure of a water pump according to another embodiment of this application;

[0033] Figure 9 is a cross-sectional schematic diagram of the water pump shown in Figure 8;

[0034] Figure 10 is an exploded schematic diagram of part of the structure of the water pump shown in Figure 8;

[0035] Figure 11 is an enlarged view of the housing and volute in Figure 10 from one of the perspectives;

[0036] Figure 12 is an enlarged view of the housing and volute in Figure 10 from another perspective;

[0037] Figure 13 is an enlarged view of the rotor assembly in Figure 10;

[0038] Figure 14 is an enlarged view of the pump cover in Figure 10;

[0039] Figure 15 is an enlarged view of point A in Figure 9, where the dashed arrow indicates the direction of water flow.

[0040] Reference numerals: Water pump 1000; Housing assembly 100; Housing 110; Stator cavity 111; Base support 112; Encapsulating body 113; Pump cover 120; Pump water chamber 121; Inlet 122; Sealing groove 1221; Fixing groove 1222; Outlet 123; Second support seat 124; Protrusion 125; Second through hole 126; Volute 130; Rotor cavity 131; Drainage port 132; Drainage pipe 1321; Drainage channel 133; Connecting section 1331; Heat dissipation section 1332; First support seat 134; Opening 135; Rear plate 136; Flange 137; End cover 140; Gasket 150; Connecting seat 160; Slide groove 161; Slot 162; Adapter 170; Fixing hole 171; First sealing ring 180; Second sealing ring 190; Rotor assembly 200; Rotor 210; Impeller 220; Recess 221; First through hole 222; Central shaft 230; Stator assembly 300; Stator winding 310; Terminal block 320; Phase wire pin 330; Stator 340; Electrical control box 400; Socket 410; Socket plate 420; Fastener 430; Handle 440; Water tank 500; Bypass pipe 510; Return water pipe 520; Receiving cavity 530; Radiator 600; Heat dissipation radiator 610; Heat dissipation channel 611; Fan 620; Water outlet connector 700; Water inlet connector 800; Welding terminal 2000; Cooling water passage 2100; Water inlet pipe 2200; Water outlet pipe 2300. Detailed Implementation

[0041] The embodiments of this application 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 application, and should not be construed as limiting this application.

[0042] In the description of this application, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0043] In the description of this application, "multiple" refers to two or more. The use of "first" and "second" is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or the order in which the technical features are indicated.

[0044] In the description of this application, unless otherwise expressly defined, terms such as "setup," "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 application in conjunction with the specific content of the technical solution.

[0045] Currently, welding torches require cooling during use. In existing technologies, water cooling is one method, where a water pump supplies water from a tank to cool the torch. However, with continuous pump operation, the rotor temperature rises, causing the pump motor to overheat due to poor heat dissipation, thus affecting pump efficiency. Furthermore, the high internal pressure during pump operation leads to unstable motor operation under heavy load, especially when the pump outlet is blocked, causing motor stall and potentially burning out due to excessive pressure. Therefore, it is necessary to propose a water pump that can solve these technical problems.

[0046] Referring to Figures 1 to 5, a water pump according to an embodiment of this application includes a housing assembly 100, a rotor assembly 200, and a stator assembly 300. The housing assembly 100 includes a casing 110, a pump cover 120, and a volute 130. The pump cover 120 is sealed to the front end of the casing 110. The pump cover 120 is provided with a water chamber 121 and an inlet 122 and an outlet 123 communicating with the water chamber 121. The volute 130 is disposed inside the casing 110, and its front end extends to the front end of the casing 110 and is sealed to the casing 110. The volute 130 is provided with an inlet 122 communicating with the water chamber 121. The rotor cavity 131 and the volute 130 are provided with a drain pipe 1321 extending to the outside of the housing 110. An annular stator cavity 111 is formed between the housing 110 and the volute 130. The rotor assembly 200 includes a rotor 210 and an impeller 220. The rotor 210 is rotatably mounted in the rotor cavity 131. The impeller 220 is fixedly connected to the end of the rotor 210 and located in the pump water cavity 121. A drain channel 133 is formed between the rotor 210 and the volute 130. The two ends of the drain channel 133 are respectively connected to the pump water cavity 121 and the drain pipe 1321. The stator assembly 300 is mounted in the stator cavity 111.

[0047] It is understood that the water pump provided in this application embodiment, by setting a drainage channel 133 between the rotor 210 and the volute 130, allows the liquid entering the pump water chamber 121 through the inlet 122 to enter the outlet 123 under the drive of the impeller 220. At the same time, some of the liquid can flow through the drainage channel 133 and be discharged through the drain pipe 1321 under the action of the water flow. This allows the liquid to directly contact the rotor 210 and the stator 300 to remove the heat generated during the operation of the rotor 210 and the stator 300, thereby cooling the rotor 210 and the stator 300, improving cooling efficiency, reducing heat accumulation in the motor, and effectively improving the working efficiency and service life of the motor. Furthermore, the optimized design of the flow channel allows the water flow to remove impurities and contaminants from the water pump and discharge them through the drain pipe 1321, preventing the accumulation of impurities and contaminants and the formation of scale, thereby maintaining the efficient operation of the water pump.

[0048] Furthermore, the water pump provided in this embodiment, through its optimized flow channel design, not only provides cooling but also pressure relief. Water flows under high pressure into the drainage channel 133 and is discharged through the drain pipe 1321, thereby balancing the internal pressure of the rotor cavity 131. This results in smoother pump operation, reducing mechanical instability and vibration. Additionally, it promptly discharges water to relieve pressure when the motor stalls due to blockage at the outlet 123, preventing motor burnout and effectively improving motor efficiency and lifespan. On the other hand, during initial operation, residual gas in the pump chamber 121 often causes trapped air, affecting efficiency. By providing the drain pipe 1321 at the rear end of the volute 130, the residual gas in the pump chamber 121 can be discharged, allowing the pump to reach full load operation more quickly and improving efficiency.

[0049] Furthermore, referring to Figures 1 to 5, according to some embodiments of this application, the pump cover 120 is provided with an inlet 122 on the axial end face away from the volute 130, and an outlet 123 is provided on the circumferential surface of the pump cover 120. Preferably, the inlet of the drainage channel 133 is connected to the outer side of the pump water chamber 121 in the radial direction, and the drain pipe 1321 is provided on the outer side of the rear end of the volute 130 in the radial direction.

[0050] Understandably, when the impeller 220 rotates, it draws liquid outside the pump into the pump chamber 121 through the inlet 122 and then discharges it through the outlet 123. The liquid pumped by the pump is not limited to water; it can also be other liquids, such as water with added antifreeze. During this process, the rotational motion of the impeller 220 generates water flow, resulting in lower water pressure in the radial portion near the centerline of the impeller 220, while the area near the outer diameter of the impeller 220 is affected by the water pressure of the high-pressure turbulent region (i.e., the radially outer region of the pump chamber 121), creating a radial pressure difference that is higher on the outside and lower on the inside. Correspondingly, the pressure in the drainage channel of the rotor cavity 131 connected to the radially outer side of the pump water cavity 121 is greater than that in the radially inner side of the pump water cavity 121. This pressure difference drives water flow from the pump water cavity 121 into the rotor cavity 131, thereby cooling the rotor 210 and stator 300. The liquid flow in the drainage channel 133 is directly driven by the available pressure drop caused by the vortex motion of the impeller 220, eliminating the need for an external power source to drive the cooling water flow and effectively reducing costs. Simultaneously, through optimized flow channel design, the inlet of the drainage channel 133 is connected to the radially outer side of the pump water cavity 121, and the outlet of the drainage channel 133, i.e., the drain pipe 1321, is correspondingly located on the radially outer side of the rear end of the volute 130. This utilizes high-pressure turbulence to increase the speed at which cooling water enters and exits the drainage channel 133, thereby removing heat from the rotor 210 and stator assembly 300 more quickly and improving heat dissipation efficiency.

[0051] Preferably, in this embodiment, the drain pipe 1321 is disposed near the bottom of the volute 130, thereby utilizing the high-pressure turbulence on the radially outer side of the pump water chamber 121 and the high and low water potential to increase the speed at which the liquid in the drain channel 133 is discharged through the drain pipe 1321, reducing hydraulic loss, thereby carrying away the heat of the rotor 210 more quickly, improving heat dissipation efficiency, and ensuring effective discharge of liquid to prevent water accumulation.

[0052] Furthermore, referring to FIG3, according to some embodiments of this application, the inlet 122 is located on the axis of the housing 110 and is arranged coaxially with the volute 130, the axis of the outlet 123 is perpendicular to the axis of the inlet 122, and the axis of the drain pipe 1321 is parallel to the axis of the inlet 122 and is located directly below the axis of the inlet 122.

[0053] Understandably, this design simplifies pipe connections, reduces installation complexity, and also helps optimize flow paths, thereby improving fluid transfer efficiency.

[0054] Furthermore, referring to FIG3, according to some embodiments of this application, the housing assembly 100 further includes an end cover 140, which is used to open or close the rear end of the housing 110, thereby facilitating the disassembly and assembly of the water pump, and facilitating maintenance and repair. The drain pipe 1321 extends rearward to the end cover 140 and protrudes from the end cover 140, and the drain pipe 1321 and the end cover 140 are sealed together. Thus, a sealed stator cavity 111 is formed between the housing 110, the volute 130 and the end cover 140, thereby preventing external liquid from entering the stator cavity 111 and causing a short circuit.

[0055] In other embodiments of this application, a potting body is formed within the stator cavity 111 through a potting process. The potting material can be an insulating material, such as a two-component condensation-type room temperature curing silicone rubber, which gives the potting body splash-proof and moisture-proof properties, and enhances insulation. Furthermore, the potting body has a high thermal conductivity, thus also serving a heat dissipation function.

[0056] Furthermore, referring to FIG3, according to some embodiments of this application, the pump cover 120 and the front end of the housing 110 are sealed together by a first sealing ring 180, thereby preventing liquid leakage from the pump water chamber 121. The volute 130 and the housing 110 are integrated into a single design, which simplifies the manufacturing process and assembly flow, reduces production and processing costs, and improves work efficiency.

[0057] Furthermore, referring to FIG3, according to some embodiments of the present application, the rotor assembly 200 further includes a central shaft 230, which is disposed on the axis of the volute 130. The rotor 210 is rotatably sleeved on the central shaft 230, thereby improving the stability of the rotor 210 during rotation and reducing vibration and noise caused by imbalance.

[0058] Furthermore, referring to FIG3, according to some embodiments of this application, a first support seat 134 is provided on the inner wall of the volute 130 away from the pump cover 120, and a second support seat 124 is provided on the pump cover 120 opposite to the first support seat 134. The two ends of the central shaft 230 are respectively inserted into the first support seat 134 and the second support seat 124. A shim 150 is provided between the rotor 210 and the first support seat 134 and the second support seat 124. The shim 150 is sleeved on the central shaft 230, which further reduces the vibration of the rotor 210 during operation and improves the stability of the system.

[0059] Further referring to Figures 2 and 3, according to some embodiments of this application, the stator assembly 300 includes a stator winding 310 and a terminal block 320. The stator winding 310 is fitted onto the side of the volute 130 facing the housing 110. The terminal block 320 is used to connect the control board of the control box 400. The terminal block 320 is installed on the side of the stator winding 310 away from the pump cover 120. The stator winding 310 has phase wire terminals, and the terminal block 320 is provided with phase wire pins 330 that are in electrical contact with the phase wire terminals.

[0060] Furthermore, according to some embodiments of this application, the stator winding 310 is disposed close to the volute 130, and the volute 130 is preferably made of a material with high thermal conductivity, corrosion resistance, and rust prevention, such as aluminum alloy, which can not only improve heat dissipation efficiency, but also help reduce weight and control costs.

[0061] Understandably, by placing the stator winding 310 close to the volute 130, which has a high thermal conductivity, the heat generated by the stator winding 310 during operation can be transferred to the volute 130. The heat is then carried away by the liquid in the drainage channel 133, thereby cooling both the rotor 210 and the stator winding 310, improving heat dissipation efficiency and ensuring system stability.

[0062] Furthermore, referring to Figures 4 and 5, according to some embodiments of this application, the water pump also includes an electrical control box 400. The electrical control box 400 is externally located on the housing 110 and is separately arranged from the housing 110. The terminal block 320 is electrically connected to the electrical control board inside the electrical control box 400, which facilitates later disassembly and maintenance, and also facilitates the management of electrical connections.

[0063] Furthermore, referring to Figures 1, 4, and 5, according to some embodiments of this application, a connecting seat 160 is provided on the top outer wall of the housing 110, a sliding groove 161 is provided on the upper end surface of the connecting seat 160, an opening is provided at the first end of the sliding groove 161, and slots 162 with communicating openings are provided on the inner walls of opposite sides of the sliding groove 161. The extension direction of the slots 162 is the same as the extension direction of the sliding groove 161. A plug-in seat 410 is provided in the middle of the bottom surface of the electrical control box 400. The plug-in seat 410 can slide in the sliding groove 161. An outwardly extending insert plate 420 is provided on opposite sides of the plug-in seat 410. The insert plate 420 can be inserted into the slot 162. A fastening member 430 is provided at the bottom front end of the electrical control box 400. The fastening member 430 can be fastened to the front end of the connecting seat 160.

[0064] Understandably, when installing the electrical control box 400, the user inserts the two insert plates 420 into the two slots 162 respectively. The insert plates 420 serve as limiters and guides, allowing the connector 410 to move along the slide groove 161 until the front end of the electrical control box 400 reaches the innermost part of the slide groove 161. This allows the fastener 430 at the bottom front end of the electrical control box 400 to engage with the front end of the connector 160. To disassemble the electrical control box 400, simply release the fastener 430 and pull out the electrical control box 400. The structure is simple and the operation is convenient. It not only facilitates quick installation but also ensures the stability of the electrical control box 400 installation, reducing the failure rate caused by loosening.

[0065] Furthermore, referring to Figure 1, according to some embodiments of this application, along the extending direction of the slide groove 161, the width of the slot 162, i.e., the distance between it and the inner walls on both sides, gradually decreases, and the minimum width of the slot 162 is not less than the width of the insert plate 420. Preferably, the minimum width of the slot 162 is equal to the width of the insert plate 420, so as to facilitate the secure installation of the electrical control box 400. It can be understood that by designing the width of the slot 162 at the opening of the slide groove 161 to be greater than the width of the insert plate 420, it is easier for the user to insert the insert plate 420 into the slot 162 without frequent positioning, thus improving work efficiency.

[0066] Furthermore, according to some embodiments of this application, the slot 162 may have a gradually decreasing width section in the front part and a straight section with a constant width that matches the width of the insert plate 420 in the rear part, so that the electrical control box 400 can be installed securely after the insert plate 420 is inserted into the straight section. The specific extension length of the changing section and the straight section can be determined according to the actual situation and is not specifically limited here.

[0067] Furthermore, referring to Figures 4 and 5, according to some embodiments of this application, handles 440 are provided on the opposite outer walls of the electrical control box 400 to facilitate user use.

[0068] Furthermore, referring to FIG1, according to some embodiments of this application, a connecting seat 160 is provided in the middle of the top outer wall of the housing 110, and a slide 161 extends along the axial direction of the housing 110, thereby optimizing the structural layout for user convenience.

[0069] Furthermore, referring to FIG1, according to some embodiments of this application, the bottom of the housing 110 is provided with base supports 112 on both opposite sides to support the water pump.

[0070] Further, referring to Figures 1 to 5, according to some embodiments of this application, the inlet 122 is fitted with an adapter 170. The inlet 122 is provided with a sealing groove 1221 and a fixing groove 1222 in sequence along the direction close to the pump cover 120. The sealing groove 1221 is fitted with a second sealing ring 190. The adapter 170 and the inlet 122 are sealed and connected by the second sealing ring 190. The outer peripheral wall of the adapter 170 is provided with a fixing hole 171 corresponding to the position of the fixing groove 1222. A bolt is provided in the fixing hole 171. The fixing groove 1222 and the fixing hole 171 are fixedly connected by bolts.

[0071] Understandably, the design of adapter 170 allows for the selection of appropriate adapter 170 specifications based on different application scenarios, enhancing the water pump's adaptability to various environments. By providing a sealing groove 1221 on the inlet 122 and fitting a second sealing ring 190 within the sealing groove 1221, a good sealing connection is formed between adapter 170 and inlet 122, effectively preventing liquid leakage and ensuring the normal operation of the system. The adapter 170 and inlet 122 are fixedly connected by bolts in the fixing groove 1222 and fixing hole 171, improving the stability of the connection and facilitating disassembly and replacement, thus reducing maintenance costs.

[0072] Furthermore, referring to FIG5, according to some embodiments of this application, the fixing groove 1222 is annular and coaxially arranged with the sealing groove 1221, and the outer peripheral wall of the adapter 170 is uniformly provided with a plurality of fixing holes 171.

[0073] Understandably, this design allows the stress generated by multiple bolts during tightening to be evenly distributed around the circumference of the inlet 122, avoiding material fatigue or deformation that may result from localized stress concentration. This improves the strength and reliability of the connection. It also helps maintain the second sealing ring 190 under a relatively uniform pressure environment, contributing to the integrity and sealing performance of the ring and reducing the risk of liquid leakage. Furthermore, it allows users to tighten from multiple angles, simplifying the installation process and facilitating position adjustment by rotating the adapter 170. When disassembly is required, the bolts can be easily loosened one by one, preventing disassembly difficulties due to excessive force at a single point.

[0074] Furthermore, referring to FIG5, according to some embodiments of this application, the inlet 122 is provided with a plurality of sealing grooves 1221 along the axial direction. The specific number of sealing grooves 1221 can be 2, 3, 4 or other numbers, which can be determined according to the actual situation and is not specifically limited here.

[0075] Understandably, by setting multiple layers of second sealing rings 190 to form a multi-layered sealing barrier, the reliability of the seal and the anti-leakage performance of the liquid are greatly improved. Even if one layer of second sealing ring 190 fails, the other sealing layers can still continue to function, ensuring the normal operation of the system. Multiple sealing grooves 1221 arranged axially provide more fixing points, making the connection between the adapter 170 and the inlet 122 more stable. This not only prevents loosening caused by vibration but also resists externally applied forces, ensuring a tight connection. When the inlet 122 is subjected to high-pressure water flow, the multiple sealing grooves 1221 can distribute the pressure, reducing the pressure load on a single second sealing ring 190, thereby reducing the risk of seal failure due to excessive pressure and enhancing the system's pressure resistance. Users can choose to install second sealing rings 190 in different sealing grooves 1221 according to actual needs, or adjust the number and position of the second sealing rings 190 according to changes in operating conditions, flexibly adjusting the sealing effect to adapt to different working conditions.

[0076] A welding machine according to this application includes the water pump of the above embodiment. Since the welding machine adopts all the above technical solutions, it should have the same beneficial effects, which will not be repeated here.

[0077] Traditional welding machines typically consist of a chassis and a welding torch. During welding operations, the chassis and the torch are usually far apart, and there may also be a height difference due to working at height. Because the welding torch generates high temperatures during operation, current welding machines generally use water cooling to cool the torch. This involves a water pump supplying water to the torch and circulating water through a loop to cool the inside of the torch.

[0078] The welding machine's chassis and welding torch are connected by pipes, the length of which is configured according to actual needs, generally between 5 and 30 meters. Therefore, during use, the pipes are exposed in the workspace and may be flattened by external forces, such as being run over by vehicles or stepped on by workers. This reduces the flow area within the pipes, leading to high pressure or blockage. Furthermore, in special working environments, there may be a height difference between the chassis and the welding torch, for example, the welding torch's working surface may be much higher than the chassis plane, making it easy for high pressure to form in the pipes. Additionally, the internal cooling water passages 2100 of the welding torch are winding and complex, with a minimum inner diameter between 1mm and 3mm, making them prone to blockage. Debris generated by the water pump, pipes, welding torch, and other components can also accumulate at the narrowest point of the cooling water passages 2100, causing further blockage.

[0079] Therefore, when the pipeline between the water pump and the welding torch is under high pressure or blocked, or when the cooling water circuit 2100 inside the welding torch is blocked, the water pump will stall, causing the water pump motor to burn out and the welding machine to stop.

[0080] To address the aforementioned technical problems, this application provides a water-cooling system. By adding a drainage channel 133 that flows through the interior of the water pump 1000, at least a portion of the liquid drawn into the water pump 1000 is returned to the water tank 500 through the drain outlet 132 of the drainage channel 133, effectively reducing the probability of the water pump motor burning out. The water-cooling system of this application embodiment is described below with reference to the accompanying drawings.

[0081] Referring to Figure 6, the water cooling system of this embodiment is part of a welding machine and can be used in manual welding machines, automatic welding machines, or semi-automatic welding machines. The water cooling system of this embodiment includes a water pump 1000 and a water tank 500. The water tank 500 has a receiving cavity 530 for containing liquid. The liquid in the receiving cavity 530 can be water, water with added antifreeze or other additives, or other liquids, which are not specifically limited here. The liquid in the water tank 500 circulates within the water cooling system to cool the welding terminal 2000, such as the welding torch, or the heat source of the water cooling system. The water pump 1000 has an inlet 122 and an outlet 123. The inlet 122 communicates with the receiving cavity 530, and the water pump 1000 draws the liquid from the receiving cavity 530 into the water pump 1000 through the inlet 122. The water pump 1000 pumps the liquid drawn in from the inlet 122 to the welding terminal 2000 through the outlet 123. It can be understood that the welding terminal 2000 can be a welding torch or other mechanism capable of metal welding or cutting. The water pump 1000 typically pressurizes the liquid by rotating the impeller 220, achieving pressurized pumping from the inlet 122 to the outlet 123.

[0082] Referring to FIG7, the water pump 1000 of this embodiment also has a drain channel 133. The drain channel 133 is disposed inside the water pump 1000 and is configured to allow at least a portion of the liquid drawn in by the inlet 122 to flow through the interior of the water pump 1000.

[0083] In this embodiment, the water pump 1000 draws in liquid through inlet 122 and delivers it to drainage channel 133 via pressure difference. Alternatively, the liquid can be delivered to drainage channel 133 by pressurization. In this embodiment, drainage channel 133 can be located between stator 340 and rotor 210 to simultaneously dissipate heat from both stator 340 and rotor 210. Alternatively, drainage channel 133 can be located on the stator 340 side, since the main heat source of the motor is the winding of stator 340.

[0084] Liquid flowing through drainage channel 133 is discharged from water pump 1000 through drain outlet 132. Drain outlet 132 is connected to receiving cavity 530 through bypass pipe 510 and transports the liquid flowing through drainage channel 133 back to water tank 500. Drain outlet 132 can be located on the end wall of water pump 1000 away from inlet 122, or on the peripheral wall of water pump 1000 away from outlet 123; no specific limitation is given here. The location of drain outlet 132 is designed according to the flow space of drainage channel 133. In order to achieve effective heat dissipation of the internal heat source of water pump 1000 by drainage channel 133, drain outlet 132 is usually located in the area of ​​water pump 1000 away from inlet 122.

[0085] In this embodiment, the drain outlet 132 differs from the outlet 123 used for heat dissipation of the welding torch. The drain outlet 132 serves as a bypass channel, allowing the liquid discharged from the water pump 1000 via the drain channel 133 to be transported back to the water tank 500 through the bypass pipe 510. Therefore, when high pressure or blockage occurs in the pumping channel between the water pump 1000 and the welding torch, or when blockage occurs inside the welding torch, the water pump 1000 can use the bypass channel to transport the sucked liquid back to the water tank 500, effectively preventing the water pump 1000 from stalling and thus reducing the chance of the water pump motor burning out, thereby improving the operational reliability of the water pump 1000. Furthermore, the drain channel 133 can remove the heat generated by the water pump motor, improving its performance and making it more energy-efficient. Additionally, the drain channel 133 can remove debris and other foreign objects from inside the water pump motor, reducing malfunctions of the water pump 1000. In addition, when the water pump 1000 starts, there is residual gas inside it, which may cause air trapping and affect the starting efficiency of the water pump motor. In this embodiment, the water pump 1000 discharges the residual gas through a bypass channel, which helps the water pump motor to start, allowing the water pump 1000 to enter full load operation more quickly and improve the working efficiency of the water pump 1000.

[0086] Referring to Figures 8, 9, and 10, a water pump 1000 according to another embodiment of this application includes a stator 340 and a rotor 210. The stator 340 and rotor 210 constitute a water pump motor, which drives the impeller 220 to rotate. To better dissipate heat from the water pump motor and remove debris and other foreign matter generated during its operation, this embodiment sets a drainage channel 133 that flows between the stator 340 and rotor 210; that is, at least a portion of the structure of the drainage channel 133 is formed between the stator 340 and rotor 210. The drainage channel 133 flowing between the stator 340 and rotor 210 also helps reduce the operating noise of the water pump motor and improves the waterproof performance of the stator 340 and rotor 210.

[0087] Referring to Figures 8, 9, and 10, the water pump 1000 of this embodiment further includes a housing assembly 100 and an impeller 220. A rotor cavity 131 and a pumping water cavity 121 are formed within the housing assembly 100. The rotor 210 is rotatably disposed within the rotor cavity 131, and the rotor 210 can drive the impeller 220 to rotate. It is understood that the rotor 210 can be connected to the impeller 220 by fixed connection or integral molding, thereby achieving synchronous rotation of the rotor 210 and the impeller 220. In this embodiment, the rotor 210 and the impeller 220 are integrally injection molded, and the rotor 210 and the impeller 220 are constructed as an integral structure of the rotor assembly 200. As an alternative embodiment, the rotor 210 can also achieve the rotation of the impeller 220 through non-contact methods such as electromagnetic drive, which is not specifically limited here. The impeller 220 is rotatably disposed in the pump chamber 121. The pump chamber 121 is connected to the inlet 122 and the outlet 123 respectively. When the impeller 220 rotates, it pressurizes the liquid in the pump chamber 121, so that the water pressure at the outlet 123 is much higher than the water pressure at the inlet 122.

[0088] In this embodiment, the water pump 1000, in order to achieve differential pressure drainage through the drainage channel 133, includes a connecting section 1331 that connects the pump chamber 121 and the rotor chamber 131. The connecting section 1331 is located in the region after the impeller 220 is pressurized, thus allowing water from the pump chamber 121 to flow through the drainage channel 133. It is understood that the connecting section 1331 may be formed as part of the pump chamber 121, as part of the rotor chamber 131, or as part of both the pump chamber 121 and the rotor chamber 131. It may also be independent of the channel between the pump chamber 121 and the rotor chamber 131, and is not specifically limited here.

[0089] Referring to FIG9, the drainage channel 133 of this embodiment further includes a heat dissipation section 1332, which is disposed through the heat source of the water pump motor. The heat dissipation section 1332 connects the connecting section 1331 and the drain outlet 132. Therefore, the drainage channel 133 can achieve pressure differential drainage to the drain outlet 132 through the connecting section 1331. During the flow of liquid through the heat dissipation section 1332, the heat source of the water pump motor can be cooled. It is understood that the heat dissipation section 1332 of this embodiment is formed between the stator 340 and the rotor 210, and can simultaneously dissipate heat from the stator 340 and the rotor 210, thereby improving the energy efficiency of the water pump motor.

[0090] Referring to FIG10, another embodiment of the housing assembly 100 of this application includes a housing 110, a pump cover 120, and a volute 130, which facilitates the assembly of the housing assembly 100 and the assembly of the impeller 220, stator 340, and rotor 210, thereby improving the installation efficiency of the water pump 1000. The housing 110 forms the outer wall of the water pump 1000, and the pump cover 120 is connected to the housing 110, with the pump cover 120 connected to one end of the housing 110. A pump water chamber 121 is formed inside the pump cover 120, and an inlet 122 and an outlet 123 are formed on the outer wall of the pump cover 120. The inlet 122 can be located on the end wall of the pump cover 120, and the outlet 123 is located on the peripheral wall of the pump cover 120, which can pressurize the liquid in conjunction with the rotation of the impeller 220, and also facilitates the connection of the inlet and outlet pipes of the water pump 1000.

[0091] Referring to Figures 11 and 12, in another embodiment of this application, the volute 130 is cylindrical and located inside the housing 110. The inner hole of the volute 130 forms a rotor cavity 131, and the rotor 210 is rotatably disposed within the rotor cavity 131. A stator cavity 111 is formed between the volute 130 and the housing 110, and the stator cavity 111 and the rotor cavity 131 are isolated by the volute 130. The stator 340 is installed within the stator cavity 111. In this embodiment, after the stator 340 is installed within the stator cavity 111, its internal space is encapsulated to form a potting body 113. The potting material can be an insulating material, such as a two-component condensation-type room temperature curing silicone rubber, which gives the potting body 113 splash-proof and moisture-proof properties, and enhances insulation. In addition, the potting body 113 has a high thermal conductivity, which also helps to dissipate heat.

[0092] In this embodiment, the volute 130 has an opening 135 at one end near the pump cover 120, and the end away from the pump cover 120 is formed as a rear plate 136. The drain outlet 132 is constructed as a drain pipe 1321 and installed on the rear plate 136. The drain pipe 1321 and the rear plate 136 can be configured as an integral part, and a reinforcing rib is also provided at the connection between the drain pipe 1321 and the rear plate 136. In this embodiment, the housing 110 extends to the rear plate 136 that covers the entire volute 130. Therefore, after the potting process, the housing 110 and the volute 130 form an integral part, making the overall structure more stable. The rear end of the housing 110 is an open structure. After being sealed by the potting body 113, the volute 130 is covered, leaving only the drain pipe 1321 protruding outward from the potting body 113.

[0093] Referring to Figures 9 and 11, in another embodiment of this application, the front end of the volute 130 has a flange 137 extending radially outward to the housing 110, and the volute 130 is connected to the housing 110 via the flange 137. In this embodiment, the volute 130 and the housing 110 are configured as an integrally molded part, for example, the volute 130 and the housing 110 are integrally injection molded. As an alternative embodiment, the volute 130 can also be fixedly connected to the housing 110 via the flange 137, for example, by screwing, bonding, riveting, etc.

[0094] Along the direction of the opening 135 of the volute 130, the inner diameter of the volute 130 gradually expands, which is beneficial for the demolding of the volute 130.

[0095] In this embodiment, the pump cover 120 is sealed to the flange portion 137, thereby ensuring the sealing of the pump water chamber 121. The pump cover 120 is sealed to the flange portion 137 by the first sealing ring 180, and the pump cover 120 is fixedly connected to the housing 110 by bolts.

[0096] In this embodiment, a connecting section 1331 of a drainage channel 133 is formed between the flange portion 137 and the side wall of the impeller 220 away from the inlet 122. The sealing position of the pump cover 120 and the flange portion 137 is located outside the connecting section 1331, thus preventing pressure relief or leakage at the beginning of the drainage channel 133 (i.e., the connecting section 1331).

[0097] In another embodiment of this application, the housing assembly 100 may have its front end extending radially inward to the volute 130, thereby connecting the housing 110 and the volute 130.

[0098] A heat dissipation section 1332 is formed between the inner wall of the volute 130 and the outer wall of the rotor 210. Therefore, the drainage channel 133 flows through the inner hole of the volute 130. The shell wall of the volute 130 isolates the stator 340 from the liquid, which is beneficial to the waterproofing of the stator 340. Moreover, the wall thickness of the volute 130 at the stator 340 is designed to be about 0.8mm, which not only meets the waterproofing requirements, but also facilitates heat exchange between the stator 340 and the liquid, thus improving the heat dissipation effect.

[0099] Referring to Figure 9, in another embodiment of this application, the drainage channel 133 flows between the inner wall of the volute 130 and the outer wall of the rotor 210. Considering that the air gap between the stator 340 and the rotor 210 affects the performance of the water pump motor, an excessively large gap between the inner wall of the volute 130 and the outer wall of the rotor 210 will cause a sharp decrease in the performance and efficiency of the water pump motor. Simultaneously, the influence of water flow resistance on the rotation of the rotor 210 must also be considered; therefore, an excessively small gap between the inner wall of the volute 130 and the outer wall of the rotor 210 will cause a sharp increase in the resistance of the rotor 210. Taking all these factors into account, the minimum gap between the inner wall of the volute 130 and the outer wall of the rotor 210 is set to 1.3 mm to 1.4 mm. When the above parameter range is met, the water pump 1000 can balance its performance and efficiency while also achieving the requirement of high speed.

[0100] Referring to Figures 9 and 12, in another embodiment of this application, the drain outlet 132 is configured as a drain pipe 1321 connected to the rear plate 136 of the volute 130. A reinforcing rib is provided at the connection between the drain pipe 1321 and the rear plate 136 to improve the connection strength of the drain pipe 1321. The drain pipe 1321 extends to the outside of the housing 110, facilitating connection with the bypass pipe 510, allowing liquid flowing through the drain channel 133 to smoothly return to the water tank 500. It is understood that the drain pipe 1321 can be arranged parallel to the axis of the rotor 210, or inclined relative to the axis of the rotor 210, for example, inclined upwards or downwards. The drain pipe 1321 can also be located near the bottom of the housing 110, which is beneficial for drainage.

[0101] In this embodiment, the inner diameter of the drain pipe 1321 gradually widens along the water flow direction, which is beneficial for the discharge of foreign objects such as debris. The minimum inner diameter of the drain pipe 1321 is 1.5mm to 2.5mm, which enables the smooth flow of liquid in the drain channel 133. It should be noted that the design of the connecting section 1331, the heat dissipation section 1332, and the inner diameter of the drain pipe 1321 of the drain channel 133 is mainly determined by the size of the foreign objects and the experimental data of the water cooling system operation to determine the specific size and location of the openings.

[0102] In another embodiment of this application, a drain pipe 1321 extends upward or downward from the peripheral wall of the volute 130 to the outside of the water pump 1000.

[0103] Referring to Figures 9, 13, and 14, the mating structure of the impeller 220 and pump cover 120 according to another embodiment of this application can increase the pumping pressure of the water pump 1000. The impeller 220 has a recess 221 at one end facing the inlet 122. The inner peripheral wall of the recess 221 has a first through hole 222, which is formed between two adjacent blades of the impeller 220 and communicates with the pressurization channel between the two adjacent blades. The inner side of the pump cover 120 has a protrusion 125 extending towards the recess 221. The protrusion 125 has at least one second through hole 126 communicating with the inlet 122. At least a portion of the second through hole 126 is located within the recess 221, so the liquid drawn into the receiving cavity 530 by the water pump 1000 can be directly delivered into the recess 221.

[0104] Referring to Figures 9 and 15, this embodiment delivers liquid to the impeller 220 via the second through-hole 126. Compared to the direct delivery of liquid by a traditional water pump (such as a dishwasher pump), the flow area of ​​the outlet 123 is smaller. The arrangement of the second through-hole 126 allows the liquid to directly enter the center of the impeller 220, enabling the impeller 220 to better collect the liquid before it is ejected. Furthermore, the smaller inlet 122 design results in a higher pumped water pressure. With the cross-sectional area of ​​the outlet 123 remaining constant, the greater the pressure generated in the pump chamber 121, the greater the flow rate. Therefore, it can meet the high-speed (11000 rpm / min) and high-pressure requirements of the welding machine water pump 1000, unlike the low-speed (3500 rpm / min) high-flow dishwasher pump.

[0105] In addition, the smaller flow area of ​​the second through hole 126 reduces water pressure leakage from the inlet 122.

[0106] Referring to Figures 13, 14, and 15, in this embodiment of the application, multiple second through holes 126 are provided, and the multiple second through holes 126 are arranged at intervals along the circumference of the protrusion 125 on the outer peripheral wall of the protrusion 125. Multiple first through holes 222 are provided, and the multiple first through holes 222 are arranged at intervals along the circumference of the recess 221 on the inner peripheral wall of the recess 221. The arrangement of the first through holes 222 and the second through holes 126 facilitates the uniform flow of liquid from the inlet 122 into the inlet end of the impeller 220, which is beneficial for increasing the pumping water pressure.

[0107] Referring to FIG15, in this embodiment of the application, along the axial direction of the rotor 210, the second through hole 126 is located on the side of the first through hole 222 away from the rotor 210. Therefore, the water flow from the second through hole 126 can be smoothly drawn away by the first through hole 222 of the impeller 220, making the flow path of the pump water chamber 121 smoother.

[0108] Referring to FIG9, in another embodiment of the water pump 1000 of this application, the rotor 210 and impeller 220 are fixedly connected, for example, by an integral injection molding process. The water pump 1000 also includes a central shaft 230 supported on the housing assembly 100, and the rotor 210 is rotatably sleeved on the outside of the central shaft 230. In this embodiment, the central shaft 230 is fixedly connected to the housing assembly 100. The central shaft 230 is made of ceramic material, has a simple and reliable structure, and is suitable for the high-speed (11000 rpm / min) rotor 210. This ensures the concentricity of the rotor 210, makes it easy to match the general-purpose rotor 210 used in the water pump 1000 of the welding machine, and has low vibration and is not prone to jamming.

[0109] Referring to FIG9, in this embodiment, in order to achieve stable rotation of rotor 210 and impeller 220, a first support seat 134 is provided at the end of volute 130 away from pump cover 120, and a second support seat 124 is provided on the inner side of pump cover 120. The first support seat 134 and the second support seat 124 are arranged opposite to each other, and the two ends of central shaft 230 are supported on the first support seat 134 and the second support seat 124 respectively.

[0110] Referring to FIG14, in one embodiment of this application, the protrusion 125 and the second support seat 124 are integrally formed parts, and together with the pump cover 120, they form an integrally formed part, making the structure of the water pump 1000 more compact.

[0111] Referring to Figure 9, it can be understood that the central shaft 230 has a shim 150 fitted between the rotor 210 and the first support seat 134, and the central shaft 230 has a shim 150 fitted between the rotor 210 and the second support seat 124.

[0112] In another embodiment of the water pump 1000, a rotor 210 and a central shaft 230 are fixedly connected, and the rotor 210 and an impeller 220 are fixedly connected. The central shaft 230 is supported on the housing assembly 100 and is rotatable relative to the housing assembly 100, that is, the central shaft 230 is rotatable between the first support 134 and the second support 124.

[0113] Referring to Figures 9 and 10, another embodiment of the water pump 1000 of this application includes a stator assembly 300, which includes a stator 340 and a terminal block 320. The stator 340 includes a stator core, an insulating frame, and stator windings. The terminal block 320 is located at one end of the stator 340 near the drain outlet 132. The terminal block 320 is used to organize and connect the wire harness of the stator windings. The terminal block 320 is connected to the electrical control board inside the electrical control box 400 via cables. The terminal block 320 is annular and arranged circumferentially around the volute 130. The drain pipe 1321 passes through the inner hole of the terminal block 320. The electrical control box 400 is external to the housing assembly 100, which facilitates the maintenance of the electrical control board and is also beneficial for the arrangement of the drain pipe 1321, preventing leakage from the drain pipe 1321 and thus avoiding damage to the electrical control board. The arrangement in this embodiment creates a gap between the drain pipe 1321 and the terminal block 320. Compared to the solution where the control board is arranged as a whole at the rear of the housing 110, this embodiment arranges the control board in an external control box 400, and the electrical components are arranged on the control board. The terminal block 320 has no electrical components, and the drain pipe 1321 can be directly extended to the rear. Moreover, even if the drain pipe 1321 leaks, it will not damage the electrical components, effectively reducing the probability of damage to the water pump 1000.

[0114] Referring to Figures 8 and 9, in this embodiment, the water pump 1000 includes an electrical control box 400 externally mounted on the housing assembly 100, containing an electrical control board. The housing assembly 100 includes a housing 110, and the electrical control box 400 is connected to the outer side of the peripheral wall of the housing 110, for example, located above the housing 110, for easy maintenance. The electrical control board is connected to the stator 340 of the water pump 1000 via a cable. This arrangement externalizes the electrical components within the housing 110, thus facilitating waterproofing design inside the housing 110. The drain outlet 132 is configured as a drain pipe 1321 connected to the side of the housing assembly 100 opposite to the inlet 122. The drain pipe 1321 does not require consideration of waterproofing for the electrical components, thus allowing for more flexible placement.

[0115] Referring to Figure 6, one embodiment of the water cooling system of this application further includes a radiator 600. One end of the radiator 600 receives the liquid flowing through the welding terminal 2000, and the other end of the radiator 600 is connected to the water tank 500 via a return water pipe 520. The function of the radiator 600 is to cool the liquid after heat exchange through the welding terminal 2000 and then return it to the water tank 500 to continue the liquid circulation of the water cooling system. The radiator 600 can take various forms, such as air cooling or refrigerant cooling, and is not specifically limited here.

[0116] Referring to Figure 6, it can be understood that the heat sink 600 in this embodiment includes a heat sink 610 and a fan 620. The heat sink 610 has a heat dissipation channel 611 through which liquid flows. After heat exchange by the welding terminal 2000, the liquid increases its contact area with the air through the heat dissipation channel 611. The fan 620 is located outside the heat sink 610 and blows air towards the heat dissipation channel 611, carrying away the heat of the liquid in the heat dissipation channel 611, thereby achieving cooling of the liquid.

[0117] One embodiment of this application includes a water tank 500 comprising a filter assembly located within a receiving cavity 530. The filter assembly filters liquid flowing back from the return end of the return pipe 520 and the return end of the bypass pipe 510. Since the water cooling system and the welding terminal 2000 generate foreign matter (e.g., metal shavings) during welding operation, the liquid, carrying away these foreign matter, returns to the water tank 500 and needs to be filtered by the filter assembly to prevent further liquid circulation and damage to the water pump 1000, welding terminal 2000, and other components. In one embodiment, the return ends of the return pipe 520 and the bypass pipe 510 are respectively connected to a first region of the receiving cavity 530 upstream of the filter assembly, and the outlet end of the water tank 500 is connected to a second region of the receiving cavity 530 downstream of the filter assembly.

[0118] Referring to Figure 6, the welding machine of this embodiment includes a welding terminal 2000 and a water cooling system as described in the previous embodiment. The water cooling system is connected to the welding terminal 2000 via pipelines. For example, the liquid circulation of the welding machine is as follows: the water pump 1000 draws liquid from the water tank 500 through the inlet 122. Most of the liquid in the pump water chamber 121 is pumped from the outlet 123 of the water pump 1000 to the welding terminal 2000 through pipelines. After heat exchange at the welding terminal 2000, the liquid is returned to the radiator 600 through pipelines. After the radiator 600 cools the liquid, it flows back to the water tank 500 through the return water pipe 520. The other part of the liquid in the pump water chamber 121 flows back to the water tank 500 from the drain outlet 132 of the water pump 1000 through the bypass pipe 510.

[0119] The welding machine in this embodiment adopts the water cooling system of the first aspect embodiment. The water cooling system adds a drainage channel 133 to the water pump 1000. The drainage channel 133 is configured to allow at least a portion of the liquid drawn in by the water pump 1000 through the inlet 122 to flow through the interior of the water pump 1000 and then be discharged from the water pump 1000 through the drainage channel 132. The impeller 220 of the water pump 1000 pumps the drawn-in liquid from the outlet 123 through a pipeline to the welding terminal 2000 for heat dissipation, while the drainage channel 132 serves as a bypass channel for draining the liquid. Liquid discharged from pump 1000 via bypass pipe 510 is returned to water tank 500. Therefore, when high pressure or blockage occurs in the pipeline between pump 1000 and welding terminal 2000, or when blockage occurs inside welding terminal 2000, pump 1000 can return the sucked liquid to water tank 500 through the bypass channel. This effectively avoids the possibility of pump 1000 stalling and thus burning out the pump motor, improves the operational reliability of pump 1000, effectively reduces the failure rate of welding machine, and extends the service life of welding machine. The drainage channel 133 can remove the heat generated by the water pump motor, improving its performance and making it more energy-efficient. The drainage channel 133 can also remove debris and other foreign objects from inside the water pump motor, reducing malfunctions of the water pump 1000. During startup, residual gas inside the water pump 1000 can cause air entrapment, affecting its starting efficiency. In this embodiment, the water pump 1000 uses a bypass channel to discharge residual gas, facilitating startup and allowing it to reach full load operation more quickly, thus improving its working efficiency. The welding machine in this embodiment can be a manual welding machine, an automatic welding machine, or a semi-automatic welding machine.

[0120] The welding machine in this application adopts all the technical solutions of the water cooling system in the above embodiments, and therefore has at least all the beneficial effects brought about by the technical solutions in the above embodiments, which will not be repeated here.

[0121] Referring to FIG6, in another embodiment of the welding machine of this application, the water cooling system further includes a water outlet connector 700 connected to the water outlet 123 and a water inlet connector 800 located on the water inlet side of the radiator 600. The welding terminal 2000 is connected to the water outlet connector 700 through the water inlet pipe 2200, and the welding terminal 2000 is connected to the water inlet connector 800 through the water outlet pipe 2300. The arrangement of the water outlet connector 700 and the water inlet connector 800 facilitates the connection between the welding terminal 2000 and the chassis, improving the ease of use of the welding machine.

[0122] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application 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 this application.

Claims

1. A water pump, used in a welding machine with a water tank, characterized in that, include: The housing assembly has an inlet, an outlet, and a drainage channel. The housing assembly includes a housing, a pump cover, and a volute. The pump cover is connected to the housing and forms a pump water chamber inside the pump cover. The inlet and the outlet are formed on the outer side wall of the pump cover and communicate with the pump water chamber respectively. The volute is located inside the housing and is cylindrical with an inner hole forming a rotor cavity. A stator cavity is formed between the volute and the housing. A rotor assembly includes a rotor and an impeller, wherein the rotor is rotatably disposed within the rotor cavity, and the rotor is capable of driving the impeller to rotate, and the impeller is rotatably disposed within the pump chamber; The stator is installed inside the stator cavity; The drainage channel is configured to allow at least a portion of the liquid in the pump body cavity to flow through the interior of the housing and / or the volute and be discharged outside the pump through a drain outlet located on the outer side wall of the housing assembly opposite to the pump cover, and the drain outlet is connected to the water tank via a bypass pipe.

2. The water pump according to claim 1, characterized in that: The two ends of the drainage channel are respectively connected to the pump chamber and the drain outlet; and / or, The drain outlet is configured as a drain pipe connected to the rear end of the volute, the drain pipe extending to the outside of the housing; and / or, At least a portion of the structure forming the heat dissipation channel is formed between the inner wall of the volute and the outer wall of the rotor; and / or, The minimum gap between the inner wall of the volute and the outer wall of the rotor is 1.3 mm to 1.4 mm.

3. The water pump according to claim 1, characterized in that: The water pump includes a housing assembly and an electrical control box for housing an electrical control board. The electrical control box is connected to the outer side of the peripheral wall of the housing, and the electrical control board is connected to the stator via a cable. The drain outlet is configured as a drain pipe connected to the side of the volute opposite to the inlet.

4. The water pump according to claim 3, characterized in that: The drain pipe is disposed adjacent to the bottom of the volute; and / or, The axis of the drain pipe is parallel to the axis of the inlet and is located below the axis of the inlet.

5. The water pump according to claim 3 or 4, characterized in that: The water pump includes a stator assembly, which includes the stator and a terminal block. The terminal block is located at the end of the stator near the drain outlet. The terminal block is annular and arranged circumferentially around the volute. The drain pipe passes through the inner hole of the terminal block.

6. The water pump according to claim 3, characterized in that: The top of the housing is provided with a connecting seat, the connecting seat is provided with a sliding groove, one end of the sliding groove is provided with an opening, and the inner walls on opposite sides of the sliding groove are respectively provided with slots communicating with the opening; The bottom of the electrical control box is provided with a plug-in socket, which can be slidably disposed in the slide groove through the opening. The two opposite sides of the plug-in socket are respectively provided with insert plates, which can be inserted into the slot. The bottom of the electrical control box is also provided with a fastener, which can be fastened to the side of the connector opposite to the opening.

7. The water pump according to claim 1, characterized in that: The rotor and impeller are fixedly connected, and the water pump also includes a central shaft supported on the housing assembly, with the rotor rotatably sleeved on the outside of the central shaft; or, The water pump also includes a central shaft fixedly connected to the rotor, the rotor and the impeller are fixedly connected, the central shaft is supported on the housing assembly and is rotatable relative to the housing assembly.

8. The water pump according to claim 7, characterized in that: A first support seat is provided at the end of the volute away from the pump cover, and a second support seat is provided on the inner side of the pump cover. The first support seat and the second support seat are arranged opposite to each other, and the two ends of the central shaft are respectively supported by the first support seat and the second support seat.

9. The water pump according to claim 1, characterized in that: The inlet is configured as an inlet pipe connected to the pump cover. The inlet pipe is provided with at least one sealing groove and a fixing groove in sequence along the direction close to the pump cover. A sealing ring is installed in the sealing groove. The water pump also includes an adapter sleeved on the inlet pipe. The adapter and the inlet pipe are sealed together by a sealing ring. The outer peripheral wall of the adapter is provided with at least one fixing hole that matches the position of the fixing groove. The fixing hole and the fixing groove are fixedly connected by bolts.

10. A water-cooling system, characterized in that: The device includes a water tank and a water pump as described in any one of claims 1 to 9, wherein the inlet of the water pump is configured to draw liquid from the water tank into the pump chamber, the outlet of the water pump is configured to deliver liquid in the pump chamber to a welding terminal, and the outlet of the water pump is configured to deliver liquid flowing through the drainage channel back to the water tank through the bypass pipe.

11. A water-cooling system for a welding machine, characterized in that, include: A water tank having a receiving cavity for holding liquid; A water pump has an inlet, an outlet, and a drain channel. The inlet is connected to a receiving cavity and configured to draw liquid from the receiving cavity into the water pump. The outlet is configured to deliver the liquid drawn in by the inlet to a welding terminal. The drain channel is configured to allow at least a portion of the liquid drawn in by the inlet to flow through the interior of the water pump and be discharged from the water pump through the drain outlet. The drain outlet is connected to the receiving cavity via a bypass pipe and delivers the liquid flowing through the drain channel back to the water tank.

12. The water cooling system according to claim 11, characterized in that: The water pump includes a stator and a rotor, and the drainage channel is at least partially formed between the stator and the rotor.

13. The water cooling system according to claim 11, characterized in that: The water pump also includes a housing assembly and an impeller. The housing assembly has a rotor cavity and a pumping cavity. The rotor is rotatably disposed in the rotor cavity and can drive the impeller to rotate. The impeller is rotatably disposed in the pumping cavity. The pumping cavity is connected to the inlet and the outlet respectively. The housing assembly includes a housing, a pump cover, and a volute. The pump cover is connected to the housing, and the pump water chamber is formed inside the pump cover. The water inlet and the water outlet are formed on the outer side wall of the pump cover. The volute is cylindrical and located inside the housing. The inner hole of the volute forms the rotor cavity. A stator cavity for mounting the stator is formed between the volute and the housing. The stator cavity and the rotor cavity are isolated by the volute. The drainage channel includes a connecting section and a heat dissipation section. The connecting section connects the pump water chamber and the rotor chamber. The heat dissipation section is formed between the stator and the rotor and connects the connecting section and the drain outlet.

14. The water cooling system according to claim 13, characterized in that: The front end of the volute has a flange that extends radially into the housing. The volute and the housing are configured as a single integral part; and / or, The pump cover is sealed to the flange; and / or The connecting section is formed between the flange and the sidewall of the impeller facing away from the inlet.

15. The water cooling system according to claim 13, characterized in that: The impeller has a recess at one end facing the water inlet, the inner peripheral wall of the recess has a first through hole, the inner side of the pump cover has a protrusion extending toward the recess, the protrusion has at least one second through hole communicating with the water inlet, and the second through hole is at least partially located in the recess.

16. A welding machine, characterized in that: It includes a welding terminal and a water cooling system as described in any one of claims 10 to 15, wherein the water cooling system is connected to the welding terminal via a pipeline.

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