Pipe expander for condenser machining

Abstract

The utility model discloses a pipe expander for condenser machining, and belongs to the technical field of condenser machining. A pipe expander for condenser machining comprises a rack, a die comprises a lower die fixedly arranged on the rack and an upper die arranged on the rack in a lifting mode, at least one first die cavity is formed in the top of the lower die, and second die cavities corresponding to the first die cavities are formed in the bottom of the upper die. A plurality of groups of spray holes for spraying lubricating oil are formed in the bottom in the first mold cavity, and an oil supply part for supplying oil to the spray holes is arranged on the rack; according to the hydraulic pipe expander, the spraying hole is formed in the inner bottom of the first mold cavity, after the mold is closed, when the hydraulic pipe expander is pushed into a pipeline by the push plate, lubricating oil in the piston cavity can be fed into the spraying hole, and then the lubricating oil is sprayed to the forming cavity and the outer wall of the pipeline by the spraying hole, so that the lubricating effect between the pipeline and the forming cavity is improved; scratches or abrasion between the outer wall of the pipeline and the forming cavity is reduced, and the forming quality of the pipeline is improved.

Description

Technical Field

[0001] This utility model relates to the field of condenser processing technology, and in particular to a tube expander for condenser processing. Background Technology

[0002] A condenser is a heat exchange device primarily used to cool and convert high-temperature, high-pressure gaseous refrigerants or working fluids into a liquid state. Its core function is to achieve a phase change process (gas → liquid) by releasing sensible and latent heat. It is widely used in refrigeration systems (such as air conditioners and refrigerators), industrial cooling, power generation, and chemical industries.

[0003] The condenser contains an array of heat exchange tubes, most of which are straight, but some have a drum-shaped structure. Drum-shaped heat exchange tubes are typically processed using a tube expander, which can be either hydraulic or mechanical. In a hydraulic tube expander, the tube is placed in a mold, a hydraulic expander is inserted, and high-pressure liquid is injected into the expander to cause the tube wall to expand and conform to the mold, forming a shape that is larger in the middle and smaller at both ends. The hydraulic expander consists of a high-strength alloy steel core rod and high-pressure resistant elastic rubber. Utilizing the high-pressure hydraulic pressure provided by the hydraulic station, when the ultra-high hydraulic pressure passes through the high-strength alloy core rod and enters the high-pressure resistant elastic rubber body, the high-pressure resistant elastic rubber body generates radial pressure. This pressure is sufficient to cause plastic deformation of the tube material, thereby achieving the expansion joint between the tube and the tube sheet.

[0004] Currently, when pipes are placed in a mold for expansion, the outer wall of the pipe comes into hard contact with the mold, which can easily cause scratches or wear on the outer wall of the pipe, affecting the surface quality of the finished product. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the prior art where the outer wall of the pipe is in hard contact with the inner cavity of the mold, which easily causes scratches or wear on the outer wall of the pipe. Therefore, this invention proposes a tube expander for condenser processing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A tube expander for condenser processing includes a frame, a mold mounted on the frame, and a hydraulic tube expander slidably mounted inside the mold. The mold includes a lower mold fixedly mounted on the frame and an upper mold raised and lowered on the frame. The lower mold has at least one first mold cavity at its top, and the upper mold has a second mold cavity corresponding to the first mold cavity at its bottom. The hydraulic tube expander is slidably mounted inside the first and second mold cavities. The bottom of the first mold cavity has multiple sets of spray holes for spraying lubricating oil. The frame is provided with an oil supply section for supplying oil to the spray holes.

[0008] To facilitate the sliding of the hydraulic tube expander, preferably, a push plate is slidably mounted on the frame, one end of the hydraulic tube expander is detachably mounted on the push plate, and a guide groove is provided on the frame. A guide block is fixedly mounted at the bottom of the push plate, the guide block is slidably connected in the guide groove, a screw is rotatably mounted in the guide groove, the guide block is threadedly connected to the screw, and a motor for driving the screw to rotate is fixedly mounted on the frame.

[0009] To facilitate oil supply to the nozzles, the oil supply unit further includes an oil tank fixedly installed at the bottom of the frame. A piston chamber is provided inside the frame, and a piston plate is slidably installed inside the piston chamber. A push rod is fixedly installed at one end of the piston plate, and the end of the push rod extending out of the piston chamber is fixedly connected to the push plate. A first pipe and a second pipe are fixedly installed on the piston chamber. Multiple sets of nozzles are connected to the first pipe, and the second pipe is connected to the oil tank. A one-way valve is fixedly installed on both the first pipe and the second pipe.

[0010] To facilitate oil supply to multiple sets of nozzles, a flow divider is further provided inside the lower mold, and all sets of nozzles are connected to the flow divider. The end of the first pipe away from the piston cavity is connected to the flow divider.

[0011] Furthermore, a limiting groove is provided in the lower mold, and a card plate with an inverted "Z" shape is slidably arranged in the limiting groove. One end of the card plate extending out of the limiting groove abuts against the push plate. A card slot is provided in the upper mold, and the other end of the card plate is engaged with the card slot. A spring is provided in the limiting groove, and both ends of the spring abut against the card plate and the limiting groove, respectively.

[0012] Preferably, a mounting plate is provided on the frame, the top of the upper mold is fixedly mounted on the bottom of the mounting plate, and a hydraulic cylinder for driving the mounting plate to rise and fall is fixedly mounted on the frame.

[0013] Compared with the prior art, this utility model provides a tube expander for condenser processing, which has the following beneficial effects:

[0014] 1. The tube expander for condenser processing has a spray hole at the bottom of the first mold cavity. After the mold is closed, when the push plate pushes the hydraulic tube expander into the pipe, the lubricating oil in the piston cavity can be sent to the spray hole. Then the spray hole sprays it onto the forming cavity and the outer wall of the pipe, which increases the lubrication effect between the pipe and the forming cavity. This not only reduces friction and facilitates the sliding of the outer wall of the pipe in the forming cavity, but also reduces scratches or wear between the outer wall of the pipe and the forming cavity, thus improving the quality of pipe forming.

[0015] 2. This tube expander for condenser processing has a clamping plate that slides inside the lower mold. When the mold is closed and the push plate slides into the forming cavity with the hydraulic tube expander, the push plate can push the clamping plate to slide, so that the clamping plate engages with the clamping groove. This can improve the mold closing strength between the lower and upper molds, reduce the floating phenomenon of the upper mold when expanding the pipe, and improve the performance.

[0016] The parts of this device not described herein are the same as or can be implemented using existing technologies. This utility model provides a spray hole at the bottom of the inner cavity of the first mold cavity. After the mold is closed, when the push plate pushes the hydraulic tube expander into the pipe, the lubricating oil in the piston cavity can be sent to the spray hole. Then the spray hole sprays it onto the forming cavity and the outer wall of the pipe, increasing the lubrication effect between the pipe and the forming cavity, reducing scratches or wear between the outer wall of the pipe and the forming cavity, and improving the forming quality of the pipe. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a tube expander for condenser processing proposed in this utility model;

[0018] Figure 2 This is a cross-sectional view of a tube expander for condenser processing proposed in this utility model;

[0019] Figure 3 This utility model proposes a tube expander for condenser processing. Figure 2 Enlarged view of section A;

[0020] Figure 4 This is a schematic diagram of the structure of a tube expander clamping plate for condenser processing proposed in this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of a tube expansion machine mold for condenser processing proposed in this utility model.

[0022] In the diagram: 1. Frame; 101. Mounting plate; 102. Guide groove; 103. Piston chamber; 2. Lower mold; 201. Upper mold; 202. First mold cavity; 203. Second mold cavity; 204. Limiting groove; 205. Slot; 206. Spray hole; 207. Diverter pipe; 3. Push plate; 301. Hydraulic tube expander; 4. Push rod; 401. First pipe; 402. Second pipe; 5. Clamping plate. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation 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.

[0025] Example:

[0026] Reference Figures 1-5 A tube expander for condenser processing includes a frame 1, on which a mold is mounted, and a hydraulic tube expander 301 is slidably mounted within the mold. The mold includes a lower mold 2 fixedly mounted on the frame 1 and an upper mold 201 lifted and lowered on the frame 1. A mounting plate 101 is lifted and lowered on the frame 1, and the top of the upper mold 201 is fixedly mounted on the bottom of the mounting plate 101, preferably by bolts. A hydraulic cylinder for driving the lifting and lowering of the mounting plate 101 is fixedly mounted on the frame 1. At least one first mold cavity 202 is formed at the top of the lower mold 2; here, three first mold cavities 202 are formed. Three second mold cavities 203 are also formed at the bottom of the upper mold 201, corresponding to the first mold cavities 202. The hydraulic tube expander 301 is slidably mounted in the first mold cavities 202 and the second mold cavities 203. When the lower mold 2 and the upper mold 201 are closed, the corresponding first mold cavity 202 and second mold cavity 203 form a forming cavity. The pipe is located in the forming cavity. Then, the hydraulic expander 301 is inserted into the pipe. High-pressure liquid is introduced into the hydraulic expander 301 through the hydraulic station. The high-pressure resistant elastic rubber body on the hydraulic expander 301 generates radial pressure. This pressure causes the pipe material to undergo plastic deformation, so that the outer wall of the pipe is in contact with the inner wall of the forming cavity, thereby achieving pipe expansion. The length of the high-pressure resistant elastic rubber body should be less than the length of the forming cavity, and ensure that the high-pressure resistant elastic rubber body is completely in the forming cavity. In addition, multiple sets of spray holes 206 for spraying lubricating oil are opened at the bottom of the first mold cavity 202. There are two to twenty sets of spray holes 206, preferably eleven sets, and they are evenly distributed along the axial direction of the first mold cavity 202. An oil supply part for supplying oil to the spray holes 206 is provided on the frame 1.

[0027] In use, by opening a spray hole 206 at the bottom of the first mold cavity 202, when the mold is closed, the push plate 3 pushes the hydraulic tube expander 301 into the pipe, which can send the lubricating oil in the piston cavity 103 to the spray hole 206. Then the spray hole 206 sprays it onto the molding cavity and the outer wall of the pipe, which increases the lubrication effect between the pipe and the molding cavity. This not only reduces the friction and facilitates the sliding of the outer wall of the pipe in the molding cavity, but also reduces the scratches or wear caused between the outer wall of the pipe and the molding cavity, thus improving the quality of pipe molding.

[0028] Reference Figure 1 , Figure 2 and Figure 5 A push plate 3 is slidably mounted on the frame 1. One end of the hydraulic expander 301 is detached and mounted on the push plate 3. Preferably, the hydraulic expander 301 is threadedly connected to the push plate 3. The high-pressure oil pipe of the hydraulic station is also threadedly connected to the push plate 3 and communicates with the corresponding hydraulic expander 301 to facilitate the supply of high-pressure oil. A guide groove 102 is provided on the frame 1. A guide block is fixedly mounted at the bottom of the push plate 3 and slidably connected in the guide groove 102 to ensure reliable sliding of the push plate 3. A screw is rotatably mounted in the guide groove 102 and threadedly connected to the guide block. A motor for driving the screw is fixedly mounted on the frame 1. In use, the motor drives the screw to rotate, which can drive the push plate 3 to slide or slide the hydraulic expander 301 into or out of the forming cavity, improving the oil extraction effect.

[0029] Reference Figures 1-3 The oil supply unit can use an oil pump to draw lubricating oil from the oil tank and then deliver it to the nozzles 206. Here, we design the oil supply unit with an oil tank fixedly installed at the bottom of the frame 1. A piston chamber 103 is opened in the frame 1, and a piston plate is slidably installed in the piston chamber 103. A push rod 4 is fixedly installed at one end of the piston plate, and the end of the push rod 4 extending out of the piston chamber 103 is fixedly connected to the push plate 3. A first pipe 401 and a second pipe 402 are fixedly installed on the piston chamber 103. Multiple sets of nozzles 206 are connected to the first pipe 401, and the second pipe 402 is connected to the oil tank. One-way valves are fixedly installed on both pipe 1 and pipe 402. During use, when the push plate 3 slides the hydraulic expander 301 into the molding cavity, the push plate 3 can drive the piston plate to slide in the piston cavity 103 through the push rod 4. During this process, the lubricating oil in the piston cavity 103 can be sent into the spray hole 206 through the first pipe 401 and then sprayed out through the spray hole 206 to achieve the lubrication effect. Conversely, when the push plate 3 moves away from the molding cavity with the hydraulic expander 301, the piston plate can be pulled to slide in the piston cavity 103 through the push rod 4, and then the lubricating oil can be drawn from the oil tank through the second pipe 402 for the next use.

[0030] Reference Figure 2 and Figure 3 A flow divider 207 is provided in the lower mold 2, which connects multiple sets of nozzles 206 to the flow divider 207. The end of the first pipe 401 away from the piston chamber 103 is connected to the flow divider 207 to facilitate oil supply to the multiple sets of nozzles 206.

[0031] Reference Figure 2 , Figure 4 and Figure 5 A limiting groove 204 is provided in the lower mold 2, and a retaining plate 5 with an inverted "Z" shape is slidably arranged in the limiting groove 204. One end of the retaining plate 5 extends out of the limiting groove 204 and abuts against the push plate 3. A retaining groove 205 is provided in the upper mold 201, and the other end of the retaining plate 5 is engaged with the retaining groove 205. A spring is provided in the limiting groove 204, and the two ends of the spring abut against the retaining plate 5 and the limiting groove 204 respectively. In use, by sliding the retaining plate 5 in the lower mold 2, when the mold is closed and the push plate 3 slides into the forming cavity with the hydraulic tube expander 301, the push plate 3 can push the retaining plate 5 to slide, so that the retaining plate 5 engages with the retaining groove 205. This can improve the mold closing strength between the lower mold 2 and the upper mold 201, and reduce the floating phenomenon of the upper mold 201 when expanding the pipe, thus improving the use effect.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tube expander for condenser processing, comprising a frame (1), wherein a mold is disposed on the frame (1), and a hydraulic tube expander (301) is slidably disposed within the mold, characterized in that, The mold includes a lower mold (2) fixedly mounted on the frame (1) and an upper mold (201) lifted and lowered on the frame (1). The lower mold (2) has at least one first mold cavity (202) at its top, and the upper mold (201) has a second mold cavity (203) at its bottom corresponding to the first mold cavity (202). The hydraulic expander (301) is slidably disposed in the first mold cavity (202) and the second mold cavity (203). The bottom of the first mold cavity (202) has multiple sets of spray holes (206) for spraying lubricating oil. The frame (1) is provided with an oil supply part for supplying oil to the spray holes (206).

2. The tube expander for condenser processing according to claim 1, characterized in that, A push plate (3) is slidably mounted on the frame (1). One end of the hydraulic tube expander (301) is detached and mounted on the push plate (3). A guide groove (102) is provided on the frame (1). A guide block is fixedly mounted at the bottom of the push plate (3). The guide block is slidably connected in the guide groove (102). A screw is rotatably mounted in the guide groove (102). The guide block is threadedly connected to the screw. A motor for driving the screw to rotate is fixedly mounted on the frame (1).

3. The tube expander for condenser processing according to claim 2, characterized in that, The oil supply unit includes an oil tank fixedly installed at the bottom of the frame (1). A piston chamber (103) is opened in the frame (1). A piston plate is slidably installed in the piston chamber (103). A push rod (4) is fixedly installed at one end of the piston plate. One end of the push rod (4) extending out of the piston chamber (103) is fixedly connected to the push plate (3). A first pipe (401) and a second pipe (402) are fixedly installed on the piston chamber (103). Multiple sets of spray holes (206) are connected to the first pipe (401). The second pipe (402) is connected to the oil tank. A one-way valve is fixedly installed on both the first pipe (401) and the second pipe (402).

4. The tube expander for condenser processing according to claim 3, characterized in that, The lower mold (2) is provided with a flow divider (207), and multiple sets of spray holes (206) are connected to the flow divider (207). The end of the first pipe (401) away from the piston chamber (103) is connected to the flow divider (207).

5. A tube expander for condenser processing according to claim 2, characterized in that, The lower mold (2) has a limiting groove (204) and a card plate (5) with an inverted "Z" shape is slidably arranged in the limiting groove (204). One end of the card plate (5) extending out of the limiting groove (204) abuts against the push plate (3). The upper mold (201) has a card slot (205) and the other end of the card plate (5) is engaged with the card slot (205). A spring is provided in the limiting groove (204) and the two ends of the spring abut against the card plate (5) and the limiting groove (204) respectively.

6. A tube expander for condenser processing according to claim 1, characterized in that, The frame (1) is equipped with a lifting mounting plate (101), the top of the upper mold (201) is fixedly mounted on the bottom of the mounting plate (101), and the frame (1) is equipped with a hydraulic cylinder for driving the mounting plate (101) to lift.

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