Pipe expander

Abstract

The utility model discloses a pipe expander, which comprises a pump body, a pipe expander and a pipe expander, the oil bag is communicated with the rear end of the pump body, and hydraulic oil in the oil bag can immerse into the cavity; the driving assembly comprises an eccentric shaft, an eccentric wheel, a plunger, an oil outlet one-way valve, an oil suction one-way valve and a plunger cavity, the eccentric shaft, the eccentric wheel, the plunger, the oil outlet one-way valve, the oil suction one-way valve and the plunger cavity are arranged in the cavity and soaked in the hydraulic oil, and the plunger cavity is not communicated with the cavity; the pipe expanding assembly comprises a piston, a pipe expanding conical head and a connector, and the piston is arranged in a sinking groove in the front end of the pump body in a sliding and sealing mode; the plunger reciprocates under the action of the eccentric wheel, and the hydraulic oil can be sucked into the plunger cavity through the oil suction one-way valve to form hydraulic pressure. The utility model has the beneficial effects that the eccentric shaft is soaked in the hydraulic oil, the heat of the driving component can be transferred to the whole machine through the hydraulic oil, and the heat dissipation is faster.

Description

Technical Field

[0001] This utility model relates to the technical field of metal pipe processing equipment, and in particular to a pipe expander. Background Technology

[0002] Traditional tube expanders have drive mechanisms that generate a lot of heat. Components such as the eccentric wheel and plunger typically rely on external lubricating grease for cooling, but this grease is prone to liquefaction and loss at high temperatures. During long-term high-speed operation, the accumulation of frictional heat leads to grease liquefaction and loss, also exacerbating component wear. Although liquid cooling solutions exist, they mostly rely on external circulation systems, resulting in complex structures and long heat dissipation paths. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a heat dissipation tube expander with a built-in drive component.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A tube expander includes a pump body, including a cavity; an oil bladder connected to the rear end of the pump body, wherein hydraulic oil in the oil bladder can be immersed in the cavity; a drive assembly including an eccentric shaft, an eccentric wheel, a plunger, an oil outlet check valve, an oil suction check valve, and a plunger cavity disposed in the cavity and immersed in the hydraulic oil, wherein the fluid communication between the plunger cavity and the cavity is controlled by the check valve; a tube expander assembly including a piston, a tube expander cone, and a connector, wherein the piston is slidably and sealingly disposed in a groove at the front end of the pump body; wherein, the plunger reciprocates under the action of the eccentric wheel, and hydraulic oil can be drawn into the plunger cavity by the oil suction check valve to form hydraulic pressure, and the hydraulic pressure pushes the piston to push out the tube expander cone.

[0005] Preferably, the cavity is a receiving space formed inside the pump body.

[0006] Preferably, the cavity is provided with a pressure relief assembly for relieving pressure in the settling tank.

[0007] Preferably, it includes a power assembly for driving the rotation of the eccentric shaft.

[0008] Preferably, the upper and lower ends of the eccentric shaft are sealed to the pump body by oil seals, and the piston and the sink are slidably sealed by a first sealing ring.

[0009] Preferably, the drive assembly further includes a plunger seat, a plunger spring, and a spring seat; the plunger seat is provided with a sliding channel communicating with the rear of the plunger cavity, and the plunger reciprocates within the sliding channel and is slidably sealed by a second sealing ring.

[0010] Preferably, the pressure relief assembly includes a pressure relief valve needle and a pressure relief button, and pressure relief is achieved by pressing the pressure relief button to open the pressure relief valve needle.

[0011] Preferably, the power assembly includes a gear set that is connected to the eccentric shaft drive, and a motor that drives the gear set.

[0012] Preferably, the oil bladder is made of rubber material, and the rear end of the oil bladder is sealed with a plug.

[0013] Preferably, the pump body, the oil bladder, the drive assembly, and the expansion tube assembly are mounted in the housing.

[0014] The beneficial effects of this utility model are as follows: by reconstructing the layout of the drive components, the heat source is directly immersed in the hydraulic oil cavity, realizing short-path heat conduction, so that the eccentric shaft is immersed in the hydraulic oil, and the heat of the drive components can be transferred to the entire machine through the hydraulic oil, resulting in faster heat dissipation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall exploded structure of the tube expander described in this utility model;

[0016] Figure 2 This is a cross-sectional internal structure diagram of the tube expander described in this utility model;

[0017] Figure 3 This is a schematic diagram showing the position and structure of the eccentric wheel in the tube expander of this utility model;

[0018] Figure 4 This is a schematic diagram showing the position and structure of the pump body in the expander of this utility model;

[0019] Figure 5 This is a schematic diagram of the overall external structure of the tube expander described in this utility model. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0021] Example 1

[0022] Reference Figure 1-5As illustrated, this embodiment proposes a tube expander that, by reconfiguring the layout of the drive assembly, allows the heat source to be directly immersed in the hydraulic oil cavity, achieving short-path heat conduction. The expander includes a pump body 1, an oil bladder 2, a drive assembly 3, a tube expansion assembly 4, a pressure relief assembly 5, and a power assembly 6. The pump body 1 and oil bladder 2 are connected. The drive assembly 3 drives the tube expansion assembly 4 to perform the tube expansion operation. The power assembly 6 is the power source for the entire expander. The pressure relief assembly 5 is located within the cavity 11 and is used for pressure relief.

[0023] Specifically, the pump body 1 includes a cavity 11, which is a receiving space formed inside the pump body 1; the oil bladder 2 is connected to the rear end of the pump body 1, and the hydraulic oil in the oil bladder 2 can be immersed in the cavity 11; the drive assembly 3 includes an eccentric shaft 31, an eccentric wheel 32, a plunger 33, an oil outlet check valve 34, an oil suction check valve 35, and a plunger cavity 36, which are disposed in the cavity 11 and immersed in hydraulic oil. The fluid communication between the plunger cavity 36 and the cavity 11 is controlled by the check valve, that is, the fluid communication between the plunger cavity 36 and the cavity 11 is controlled by the set oil outlet check valve. The control of the oil check valve 34 and the suction check valve 35 enables the connection or blockage between the plunger chamber 36 and the chamber 11; the expansion tube assembly 4 includes a piston 41, an expansion tube cone 42 and a connector 43, with the piston 41 slidably sealed in the recess 12 at the front end of the pump body 1; wherein, the plunger 33 reciprocates under the action of the eccentric wheel 32, and can draw hydraulic oil into the plunger chamber 36 through the suction check valve 35 to form hydraulic pressure, which drives the piston 41 to push out the expansion tube cone 42 through the outlet check valve 34.

[0024] As one sealing solution in this embodiment, the upper and lower ends of the eccentric shaft 31 are sealed to the pump body 1 by oil seals 37. The piston 41 and the countersink 12 are slidably sealed by a first sealing ring 44. The oil bladder 2 is made of rubber, and its rear end is sealed by a plug 21.

[0025] Furthermore, in order to achieve a controllable connection between the plunger cavity 36 and the cavity 11, the drive assembly 3 also includes a plunger seat 38, a plunger spring 39 and a spring seat 310; wherein the plunger seat 38 is provided with a sliding channel communicating with the rear of the plunger cavity 36, and the plunger 33 slides back and forth in the sliding channel and is slidably sealed by the second sealing ring 311.

[0026] The pressure relief assembly 5 includes a pressure relief valve needle 51 and a pressure relief button 52. Pressure relief is achieved by pressing the pressure relief button 52 to open the pressure relief valve needle 51. The pressure relief assembly 5 is connected to the sink 12. After hydraulic oil is injected into the sink 12 to form a hydraulically driven piston 41, the hydraulic pressure formed in the sink 12 is relieved through the pressure relief assembly 5.

[0027] The power assembly 6 is used to drive the rotation of the eccentric shaft 31. The power assembly 6 includes a gear set 61 that is connected to the eccentric shaft 31 for transmission, and a motor 62 that drives the gear set 61.

[0028] This embodiment also includes a housing 7, a pump body 1, an oil bladder 2, a drive assembly 3, and an expansion tube assembly 4 mounted on the housing 7.

[0029] It should be noted that this embodiment aims to embed the drive component 3 within the pump body 1. As for the implementation of other technical issues of the tube expander, such as the circuit control part, how to control the opening and closing of the equipment through the motor, how the equipment performs automated tube expansion operations, how to set the pressure control relief valve, the opening and closing of the oil outlet check valve 34 and the oil suction check valve 35, and other principle-related technical issues, or the internal wiring layout, the adaptability of each component to the housing 7, etc., these are all existing and very mature technologies, and are also non-essential technical features. When considering technical issues, one should not deviate from the structural features addressed in this embodiment, that is, the core meaning of embedding the drive component 3. Therefore, they will not be described in detail here.

[0030] To be more specific.

[0031] The overall structure of this embodiment is as follows: the tube expander uses a pump body 1 as its core supporting frame, with a through-type cavity 11 inside. The rear end of the pump body 1 is connected to a compressible oil bladder 2, and the front end is machined with an axial groove 12. The drive assembly 3 is built into the cavity 11, and the piston 41 of the tube expander assembly 4 is slidably mounted in the groove 12. The hydraulic oil in the oil bladder 2 can freely flow into the cavity 11 to immerse the drive assembly 3, forming a closed-loop heat dissipation medium circulation.

[0032] The system includes the following interconnected structures: a hydraulic oil circulation system, with the oil bladder 2 serving as a hydraulic oil volume compensation unit, its rubber material allowing for deformation under pressure. When the hydraulic oil expands due to temperature increase, the oil bladder 2 can contract to absorb the excess volume; when the temperature decreases, the oil bladder 2 can elastically return to its original position to maintain stable system oil pressure. The cavity 11 serves as the mounting cavity for the drive assembly 3 and also as a heat dissipation oil tank, with reserved space for oil flow at its top. The upper and lower ends of the eccentric shaft 31 are dynamically sealed by oil seals 37 to ensure that the oil does not leak out.

[0033] The motion transmission chain of the drive component 3 is as follows: the power input is driven by the eccentric shaft 31 from the external power component 6, through the motor 62 and the speed-changing gear set 61. The eccentric shaft 31 drives the eccentric wheel 32 to make non-circular motion, which forces the end of the plunger 33 in contact with it to reciprocate linearly within the sliding channel of the plunger seat 38.

[0034] The hydraulic pressure is generated as follows: During the suction phase, as the plunger 33 moves backward, the volume of the plunger cavity 36 increases, creating a negative pressure. The suction check valve 35 opens, and hydraulic oil in the cavity 11 is drawn into the plunger cavity 36. During the pressure phase, the plunger 33 moves forward, compressing the plunger cavity 36. This continuous reciprocating motion forces the outlet check valve 34 to open, and high-pressure oil enters the settling tank 12, pushing the piston 41.

[0035] In this embodiment, the sealing scheme is as follows: the plunger 33 and the plunger seat 38 are slidably sealed by the second sealing ring 311; the plunger spring 39 abuts against the plunger 33 through the spring seat 310 to ensure that it always fits against the eccentric wheel 32.

[0036] Furthermore, the execution logic of the expansion tube assembly 4 is as follows: a high-pressure sealed cavity is formed between the outer wall of the piston 41 and the sink 12 through the first sealing ring 44. When the high-pressure oil enters the sink 12, it pushes the piston 41 to extend axially, causing the expansion tube cone 42 to be pushed into the pipe to be processed. When depressurization occurs, pressing the depressurization button 52 drives the depressurization valve needle 51 to open, the oil in the sink 12 flows back to the cavity 11, and the piston 41 retracts under the action of an external load such as a return spring.

[0037] The heat dissipation path is as follows: the frictional heat generated by the drive component 3 is directly transferred to the hydraulic oil in the cavity 11, and the oil transfers the heat to the metal housing of the pump body 1 through convection, and finally it can be dissipated through the surface of the housing 7. At the same time, the oil bladder 2, as a volume regulator, can also ensure the system pressure balance during thermal expansion and contraction.

[0038] The actual usage process is as follows:

[0039] After the motor 62 is started, the power is transmitted to the eccentric shaft 31 via the transmission gear set 61. The rotation of the eccentric wheel 32 drives the plunger 33 to reciprocate continuously. When the plunger 33 retracts, the suction check valve 35 opens to draw in low-temperature oil; when the plunger 33 advances, it reaches the opening pressure of the outlet check valve 34, and the outlet check valve 34 opens to output high-pressure oil to the settling tank 12. The piston 41 extends under the action of oil pressure, causing the expansion cone 42 to expand the tube wall. During continuous operation, the oil temperature in the cavity 11 rises, and the heat is conducted to the housing 7 through the pump body 1 for dissipation.

[0040] The pressure relief operation is as follows: After the tube expansion is completed, press the pressure relief button 52, which will open the channel in conjunction with the pressure relief valve needle 51. The piston 41 will reset under the action of the rebound force, pushing the oil back into the cavity 11. The contraction of the oil bladder 2 can also compensate for the volume contraction caused by the decrease in oil temperature.

[0041] The structural heat dissipation optimization in this embodiment involves immersing the entire drive assembly 3 in hydraulic fluid, utilizing the high specific heat capacity of hydraulic oil to rapidly absorb frictional heat, and achieving large-area heat dissipation through the metal casing. Dynamic pressure balance optimization is also implemented, with the oil bladder 2 acting as an adaptive volume compensation unit to prevent high-temperature oil expansion from causing seal failure. The closed oil circuit design reduces external contamination, extends the lifespan of drive components, and simplifies maintenance.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the scope of protection of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description and ideas. It is neither necessary nor possible to exhaustively describe all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the technical solution of this utility model should be covered within the scope of protection of the claims of this utility model.

Claims

1. A tube expander, characterized in that: include, Pump body (1), including cavity (11); The oil bladder (2) is connected to the rear end of the pump body (1), and the hydraulic oil in the oil bladder (2) can be immersed in the cavity (11); The drive assembly (3) includes an eccentric shaft (31), an eccentric wheel (32), a plunger (33), an oil outlet check valve (34), an oil suction check valve (35), and a plunger chamber (36) disposed in the cavity (11) and immersed in the hydraulic oil. The fluid communication between the plunger chamber (36) and the cavity (11) is controlled by the check valve. The tube expansion assembly (4) includes a piston (41), a tube expansion cone (42), and a connector (43). The piston (41) is slidably sealed in the groove (12) at the front end of the pump body (1). The plunger (33) reciprocates under the action of the eccentric wheel (32), and the hydraulic oil can be drawn into the plunger cavity (36) by the oil suction check valve (35) to form hydraulic pressure. The hydraulic pressure pushes the piston (41) to push out the expansion tube cone (42).

2. The tube expander according to claim 1, characterized in that: The cavity (11) is the accommodating space formed inside the pump body (1).

3. The tube expander according to claim 1, characterized in that: The cavity (11) is provided with a pressure relief assembly (5) for relieving pressure in the settling tank (12).

4. The tube expander according to claim 1, characterized in that: Includes a power assembly (6) for driving the rotation of the eccentric shaft (31).

5. The tube expander according to claim 1, characterized in that: The upper and lower ends of the eccentric shaft (31) are sealed to the pump body (1) by oil seals (37), and the piston (41) and the sink (12) are slidably sealed by a first sealing ring (44).

6. The tube expander according to claim 1, characterized in that: The drive assembly (3) also includes a plunger seat (38), a plunger spring (39), and a spring seat (310). The plunger seat (38) is provided with a sliding channel communicating with the rear of the plunger cavity (36), and the plunger (33) slides back and forth in the sliding channel and is slidably sealed by the second sealing ring (311).

7. The tube expander according to claim 3, characterized in that: The pressure relief assembly (5) includes a pressure relief valve needle (51) and a pressure relief button (52). Pressure relief is achieved by pressing the pressure relief button (52) to open the pressure relief valve needle (51).

8. The tube expander according to claim 4, characterized in that: The power assembly (6) includes a gear set (61) that is connected to the eccentric shaft (31) for transmission, and a motor (62) that drives the gear set (61).

9. The tube expander according to claim 1, characterized in that: The oil bladder (2) is made of rubber material, and the rear end of the oil bladder (2) is sealed by a plug (21).

10. The tube expander according to claim 1, characterized in that: The pump body (1), the oil bladder (2), the drive assembly (3), and the expansion tube assembly (4) are mounted on the housing (7).

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