Hydraulic supercharging device

Abstract

The utility model relates to the field of hydraulic devices, in particular to a hydraulic pressurizing device which comprises a shell, a normal-pressure cavity is formed in the shell, a pressurizing cavity communicated with the normal-pressure cavity is further formed in the shell, and a piston rod is connected in the pressurizing cavity in a sliding mode. The shell is provided with an oil inlet through which hydraulic oil flows into the normal pressure cavity so as to drive the piston rod to extrude into the pressurizing cavity, an oil outlet through which high-pressure hydraulic oil is output to the outside from the pressurizing cavity, and an oil drainage port through which the hydraulic oil flows out from the pressurizing cavity; the shell is provided with a control valve used for controlling the flow direction of hydraulic oil so as to drive the piston to move in a reciprocating mode, and the oil inlet, the normal pressure cavity, the oil drainage opening and the pressurization cavity are all communicated with the control valve. The hydraulic supercharging device has the effects that the use convenience of the hydraulic supercharging device is improved, and supercharging can be directly completed by means of hydraulic power of the injection molding machine.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic devices, and in particular to a hydraulic booster device. Background Technology

[0002] A hydraulic booster is a hydraulic device that can increase the pressure of a hydraulic system.

[0003] In current mold-making processes, in-mold thermal cutting is used. This action requires extremely high pressure due to the small size of the hydraulic cylinders within the mold, necessitating an additional independent power unit. This power unit typically uses pneumatic-hydraulic booster technology, requiring an additional pneumatic power source. A hydraulic booster generally includes a cylinder and a piston. The cylinder contains an interconnected normal pressure chamber and a booster chamber. Through synchronized pneumatic and hydraulic action, the piston is forced from the normal pressure chamber into the booster chamber, increasing the pressure of the hydraulic oil in the booster chamber and outputting high-pressure hydraulic oil.

[0004] Pneumatic power is generally provided by compressed air, which requires the addition of a corresponding air pump. An air filter is also usually required to filter impurities in the compressed air. The equipment is numerous and bulky, making it inconvenient to install and maintain. Utility Model Content

[0005] To improve the ease of use of the hydraulic booster device and enable direct boosting using the hydraulic power of the injection molding machine, this application provides a hydraulic booster device.

[0006] A hydraulic booster device includes a housing, an atmospheric pressure chamber, and a booster chamber connected to the atmospheric pressure chamber. A piston rod is slidably connected within the booster chamber. The housing has an inlet for hydraulic oil to flow into the atmospheric pressure chamber to drive the piston rod into the booster chamber. The housing also has an outlet for high-pressure hydraulic oil to be output from the booster chamber to the outside. Furthermore, the housing has a drain outlet for hydraulic oil to flow out of the booster chamber. A control valve is provided on the housing to control the flow direction of the hydraulic oil to drive the piston reciprocating. The inlet, atmospheric pressure chamber, drain outlet, and booster chamber are all connected to the control valve.

[0007] By adopting the above technical solution, hydraulic oil is injected into the atmospheric pressure chamber to drive the piston rod to squeeze into the pressure boosting chamber, thereby increasing the internal pressure of the hydraulic oil in the pressure boosting chamber. The high-pressure hydraulic oil is then output through the oil outlet. The piston rod reciprocates through the control valve to continuously output high-pressure hydraulic oil. Thus, the piston rod is driven by hydraulic oil alone, improving the ease of use of the hydraulic booster device.

[0008] Preferably, the control valve includes a first valve and a second valve. The first valve connects the oil inlet to the atmospheric pressure chamber and the oil drain to the pressure boosting chamber. The second valve connects the oil inlet to the pressure boosting chamber and the oil drain to the atmospheric pressure chamber.

[0009] By adopting the above technical solution, hydraulic oil is injected into the atmospheric pressure chamber through the first valve, which drives the piston rod to squeeze into the pressure boosting chamber to increase the internal pressure of the hydraulic oil in the pressure boosting chamber. After the high-pressure hydraulic oil is output through the oil outlet, it is fed into the pressure boosting chamber through the oil drain port through the second valve and then output from the atmospheric pressure chamber through the oil inlet port, thereby driving the piston rod to retract. This causes the piston rod to reciprocate in the atmospheric pressure chamber and the pressure boosting chamber, continuously outputting high-pressure hydraulic oil, thereby improving the ease of use of the piston rod.

[0010] Preferably, the control valve further includes a third valve, which closes the oil inlet and connects to the normal pressure chamber, the booster chamber and the drain port, and is used to depressurize the normal pressure chamber and the booster chamber.

[0011] By adopting the above technical solution, the internal pressure of the atmospheric pressure chamber is balanced by the third valve, thereby reducing the possibility of damage to devices such as sealing rings due to excessive internal pressure in the atmospheric pressure chamber, and thus improving the stability of the atmospheric pressure chamber in use.

[0012] Preferably, the housing is provided with a first check valve that allows hydraulic oil to flow unidirectionally from the inlet to the control valve.

[0013] By adopting the above technical solution, the backflow of hydraulic oil is reduced through the first check valve. This improves the continuity and stability of the hydraulic oil path, thereby enhancing the stability of the hydraulic booster system.

[0014] Preferably, the housing is provided with an accumulator, which is connected to the output end of the first one-way valve.

[0015] By adopting the above technical solution, the accumulator can absorb the hydraulic shock caused by sudden reversal of the control valve or sudden stop of the hydraulic pump, thereby reducing damage to the device components and releasing the absorbed pressure, thereby improving the energy utilization rate of the hydraulic booster device.

[0016] Preferably, a first switching valve is provided between the accumulator and the first check valve. When the first switching valve is de-energized, hydraulic oil flows unidirectionally from the output end of the first check valve to the accumulator. When the first switching valve is energized, the output end of the first check valve is connected to the accumulator.

[0017] By adopting the above technical solution, when the first switching valve is de-energized, the accumulator continuously absorbs hydraulic shocks and releases the absorbed pressure into the oil inlet when the first switching valve is energized, thereby controlling the time for the accumulator to absorb and release pressure, and thus improving the stability of the hydraulic booster device.

[0018] Preferably, the housing is provided with a pressure reducing valve for stabilizing the input hydraulic pressure, the input end of the pressure reducing valve is connected to the output end of the first check valve, and the output end of the pressure reducing valve is connected to the control valve.

[0019] By adopting the above technical solution, the output hydraulic oil pressure is controlled by a pressure reducing valve, thereby continuously inputting hydraulic oil with a stable pressure, reducing damage to device components, and improving the stability of the hydraulic booster device.

[0020] Preferably, the housing is provided with an overflow valve for limiting the pressure inside the atmospheric pressure chamber, and the overflow valve is connected to the pressurization chamber.

[0021] By adopting the above technical solution, when the pressure in the atmospheric pressure chamber is too high, the pressure in the atmospheric pressure chamber is released through the overflow valve, thereby limiting the maximum pressure in the atmospheric pressure chamber, reducing the possibility of damage to internal components due to excessive internal pressure, and improving the stability of the atmospheric pressure chamber in use.

[0022] Preferably, the diameter of the atmospheric pressure chamber is larger than that of the booster chamber. The piston rod is integrally provided with a pressure plate at one end of the atmospheric pressure chamber. The outer circumferential wall of the pressure plate abuts against the inner wall of the atmospheric pressure chamber. The housing is provided with an oil return port for oil to be discharged and returned from the atmospheric pressure chamber. The oil return port is located on the side of the atmospheric pressure chamber closer to the booster chamber.

[0023] By adopting the above technical solution, because the piston rod is under force balance, the pressure on the hydraulic oil is inversely proportional to the area of ​​the pressure surface. The pressure of the piston rod on the hydraulic oil in the booster chamber is further increased by the pressure plate with a larger diameter and the piston rod with a smaller diameter.

[0024] Preferably, the housing is provided with a pressure sensor for detecting the pressure inside the atmospheric pressure chamber.

[0025] By adopting the above technical solution, the pressure inside the atmospheric pressure chamber is monitored in real time by a pressure sensor, thereby reducing the possibility of damage to internal components due to excessive internal pressure, and thus improving the stability of the atmospheric pressure chamber in use.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. By injecting hydraulic oil into the atmospheric pressure chamber, the piston rod is driven to squeeze into the pressure chamber to increase the internal pressure of the hydraulic oil in the pressure chamber, and the high-pressure hydraulic oil is output through the oil outlet. The piston rod reciprocates through the control valve to continuously output high-pressure hydraulic oil, thereby driving the piston rod to move only through hydraulic oil, which improves the ease of use of the hydraulic booster device.

[0028] 2. The first check valve reduces hydraulic oil backflow, thereby improving the continuity and stability of the hydraulic oil path, and consequently enhancing the stability of the hydraulic booster system.

[0029] 3. Because the piston rod is in force balance, the pressure on the hydraulic oil is inversely proportional to the area of ​​the pressure surface. The pressure on the hydraulic oil in the booster chamber is further increased by the larger diameter pressure plate and the smaller diameter piston rod. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a hydraulic booster device according to an embodiment of this application.

[0031] Figure 2 This is a cross-sectional view of the hydraulic booster device.

[0032] Figure 3 This is a hydraulic schematic diagram of a hydraulic booster device.

[0033] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Atmospheric pressure chamber; 3. Pressure boosting chamber; 4. Piston rod; 5. Oil inlet; 6. Oil outlet; 7. Oil drain port; 8. Control valve; 9. First valve; 10. Second valve; 11. Third valve; 12. First check valve; 13. Accumulator; 14. First switching valve; 15. Pressure reducing valve; 16. Relief valve; 17. Pressure plate; 18. Oil return port; 19. Pressure sensor; 20. Second check valve; 21. Second switching valve; 22. Third switching valve. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0035] Reference Figure 1 and Figure 2 This application discloses a hydraulic booster device, including a housing 1. A normal pressure chamber 2 is provided on the housing 1, and a booster chamber 3, connected to the normal pressure chamber 2, is also provided on the housing 1. A piston rod 4 is slidably connected within the booster chamber 3. An oil inlet 5 is provided on the housing 1 for communication between the normal pressure chamber 2 and the outside, and an oil outlet 6 is provided on the housing 1 for communication between the booster chamber 3 and the outside. Hydraulic oil enters the normal pressure chamber 2 through the oil inlet 5, thereby driving the piston rod 4 to press into the booster chamber 3, thus increasing the pressure of the hydraulic oil in the booster chamber 3, and outputting the high-pressure hydraulic oil to the outside through the oil outlet 6. An oil drain port 7 is provided on the housing 1 for the hydraulic oil to flow out of the booster chamber 3, and the oil drain port 7 is connected to a hydraulic oil tank. A control valve 8 is provided on the housing 1 to change the flow direction of the hydraulic oil to cause the piston rod 4 to reciprocate. The oil inlet 5, the normal pressure chamber 2, the booster chamber 3, and the oil outlet 6 are all connected to the control valve 8.

[0036] Reference Figure 1 and Figure 2The diameter of the atmospheric pressure chamber 2 is larger than that of the booster chamber 3. A pressure plate 17 is integrally formed at one end of the piston rod 4 located in the atmospheric pressure chamber 2. The outer circumferential wall of the pressure plate 17 abuts against the inner wall of the atmospheric pressure chamber 2. When the hydraulic oil flow rate is constant, the pressure on the hydraulic oil is inversely proportional to the pressure area. The smaller diameter booster chamber 3 further enhances the squeezing effect of the piston rod 4 on the hydraulic oil in the booster chamber 3. Sealing rings can be added between the piston rod 4 and the booster chamber 3, and between the pressure plate 17 and the atmospheric pressure chamber 2, to reduce hydraulic oil leakage. A return port 18 is provided on the housing 1 for oil to return from the atmospheric pressure chamber 2, and the return port 18 is connected to the hydraulic oil tank. The pressure plate 17 slides synchronously with the piston rod 4 within the atmospheric pressure chamber 2, thus dividing the atmospheric pressure chamber 2 into two parts with the pressure plate 17 as the boundary. The oil inlet 5 is connected to the part of the atmospheric pressure chamber 2 away from the booster chamber 3, and the oil return port 18 is connected to the part of the atmospheric pressure chamber 2 closer to the booster chamber 3.

[0037] Reference Figure 1 and Figure 3 The control valve 8 includes a first valve 9, a second valve 10, and a third valve 11. The first valve 9 connects the oil inlet 5 to the atmospheric pressure chamber 2 and the oil drain 7 to the booster chamber 3, thereby allowing hydraulic oil to enter the atmospheric pressure chamber 2 and press against the pressure plate 17 to drive the piston rod into the booster chamber 3. The second valve 10 connects the oil inlet 5 to the booster chamber 3 and the oil drain 7 to the atmospheric pressure chamber 2, thereby allowing hydraulic oil to enter the booster chamber 3 and press against the piston rod to drive the piston rod to reset. The third valve 11 closes the oil inlet 5 and connects both the atmospheric pressure chamber 2 and the booster chamber 3 to the oil drain 7 to balance the internal pressure of the atmospheric pressure chamber 2 and the booster chamber 3. The control valve 8 can be switched manually or driven by an electromagnet. In this embodiment, a pressure-relief three-position four-way directional valve driven by an electromagnet is used as an example.

[0038] Reference Figure 1 and Figure 3 The housing 1 is provided with a first check valve 12 for hydraulic oil to flow unidirectionally to the control valve 8. The input end of the first check valve 12 is connected to the oil inlet 5, and the output end of the first check valve 12 is connected to the control valve 8. The backflow of hydraulic oil is reduced by the first check valve 12.

[0039] Reference Figure 1 and Figure 3 The housing 1 is provided with a pressure reducing valve 15 for stabilizing the input hydraulic oil pressure. The pressure reducing valve 15 is located between the first check valve 12 and the control valve 8. The input end of the pressure reducing valve 15 is connected to the output end of the first check valve 12, and the output end of the pressure reducing valve 15 is connected to the control valve 8.

[0040] Reference Figure 1 and Figure 3The housing 1 is provided with a second check valve 20 for reducing the backflow of hydraulic oil from the hydraulic oil tank. The second check valve 20 is located between the drain port 7 and the control valve 8. The second check valve 20 allows the hydraulic oil to flow out unidirectionally into the hydraulic oil tank through the drain port 7.

[0041] Reference Figure 1 and Figure 3 The housing 1 is equipped with a relief valve 16 to limit the maximum pressure in the atmospheric pressure chamber 2. One end of the relief valve 16 is connected to the atmospheric pressure chamber 2, and the other end is connected to the hydraulic oil tank. When the pressure in the atmospheric pressure chamber 2 is too high, the relief valve 16 opens to connect the atmospheric pressure chamber 2 to the hydraulic oil tank to release pressure. The housing 1 is also equipped with a pressure sensor 19 to monitor the pressure in the atmospheric pressure chamber 2. By controlling the pressure in the atmospheric pressure chamber 2 through the pressure sensor 19 and the relief valve 16, the damage to the internal components of the housing 1 caused by excessive pressure in the atmospheric pressure chamber 2 is reduced.

[0042] Reference Figure 1 and Figure 3 An accumulator 13 is provided on the housing 1 to absorb hydraulic shock. The oil valve port of the accumulator 13 is connected to the output end of the first check valve 12. The accumulator 13 reduces the damage to the internal components of the housing 1 when excessive hydraulic shock occurs due to reasons such as sudden reversal of the control valve 8 or sudden stop of the hydraulic pump.

[0043] Reference Figure 1 and Figure 3 A first switching valve 14 is provided on the housing 1, located between the accumulator 13 and the first one-way valve 12. The first switching valve 14 is driven by an electromagnet. When the first switching valve 14 is energized, the accumulator 13 and the first one-way valve 12 are interconnected. When the first switching valve 14 is de-energized, it is unidirectionally connected to the accumulator 13. By controlling the connection between the accumulator 13 and the first one-way valve 12 through the first switching valve 14, the timing of the accumulator 13 absorbing and releasing pressure is controlled.

[0044] Reference Figure 1 and Figure 3 A second switching valve 21 is provided on the housing 1. One end of the second switching valve 21 is connected to the oil valve port of the accumulator 13, and the other end is connected to the hydraulic oil tank. The second switching valve 21 is driven by an electromagnet. When the second switching valve 21 is de-energized, the accumulator 13 and the hydraulic oil tank are connected to each other. When the first switching valve 14 is energized, the hydraulic oil tank is unidirectionally connected to the accumulator 13. By controlling the connection between the accumulator 13 and the hydraulic oil tank through the second switching valve 21, the pressure inside the accumulator 13 can be actively released to the outside.

[0045] Reference Figure 1 and Figure 3A third switching valve 22 is provided on the housing 1. The third switching valve 22 is located between the pressure boosting chamber 3 and the control valve 8. The third switching valve 22 is driven by an electromagnet. When the second switching valve 21 is energized, the pressure boosting chamber 3 and the control valve 8 are connected. When the first switching valve 14 is de-energized, the pressure boosting chamber 3 is isolated from the control valve 8. By controlling the connection between the pressure boosting chamber 3 and the control valve 8 through the third switching valve 22, the energy waste when the accumulator 13 releases pressure to the output end of the first one-way valve 12 is reduced.

[0046] Work process:

[0047] 1. Control valve 8 is energized to connect the second valve 10, and the first switch valve 14 is de-energized to allow the first check valve 12 to conduct unidirectionally to the accumulator 13, thereby allowing the accumulator 13 to absorb hydraulic shock. The second switch valve 21 is energized to isolate the accumulator 13 from the outside. The third switch valve 22 is energized to connect the booster chamber 3 with the control valve 8. At this time, the oil inlet 5 is connected to the booster chamber 3, and the oil outlet 7 is connected to the atmospheric pressure chamber 2. The piston rod 4 is squeezed by the hydraulic oil and retracts to the pressure plate 17 to abut against the inner wall of the atmospheric pressure chamber 2. A negative pressure is formed in the atmospheric pressure chamber 2 and the oil returns through the return port 18.

[0048] 2. Control valve 8 is energized to connect the first valve 9, and the first switch valve 14 is de-energized to allow the first check valve 12 to conduct unidirectionally to the accumulator 13, thereby allowing the accumulator 13 to absorb hydraulic shocks. The second switch valve 21 is energized to isolate the accumulator 13 from the outside world. The third switch valve 22 is energized to connect the booster chamber 3 with the control valve 8. At this time, the oil inlet 5 is connected to the atmospheric pressure chamber 2, and the oil outlet 7 is connected to the booster chamber 3. The pressure plate 17 is squeezed by the hydraulic oil and slides towards the side closer to the booster chamber 3. The piston rod 4 slides into the booster chamber 3 under the action of the pressure plate 17 and squeezes the hydraulic oil in the booster chamber 3, thereby forming high-pressure hydraulic oil in the booster chamber 3 and outputting it through the oil outlet 6. The hydraulic oil in the atmospheric pressure chamber 2 is squeezed and output to the hydraulic oil tank through the oil return port 18.

[0049] 3. Control valve 8 is energized to connect the first valve 9, and the first switch valve 14 is energized to connect the first check valve 12 to the accumulator 13, thereby releasing pressure from the accumulator 13. The second switch valve 21 is energized to isolate the accumulator 13 from the outside. The third switch valve 22 is de-energized to isolate the boosting chamber 3 from the control valve 8. At this time, the oil inlet 5 is connected to the atmospheric pressure chamber 2, and the oil outlet 7 is connected to the boosting chamber 3. The accumulator 13 releases pressure and enters the atmospheric pressure chamber 2 through the oil inlet 5 and the control valve 8. The pressure plate 17 is squeezed by the pressure released by the accumulator 13 and slides towards the side closer to the boosting chamber 3. The piston rod 4 slides into the boosting chamber 3 under the action of the pressure plate 17 and squeezes the hydraulic oil in the boosting chamber 3, thereby forming high-pressure hydraulic oil in the boosting chamber 3 and outputting it through the oil outlet 6. The hydraulic oil in the atmospheric pressure chamber 2 is squeezed and output to the hydraulic oil tank through the oil return port 18.

[0050] 4. Control valve 8 is de-energized to allow third valve 11 to connect, first switch valve 14 is de-energized to allow first check valve 12 to conduct unidirectionally to accumulator 13, thereby allowing accumulator 13 to absorb hydraulic shock, second switch valve 21 is energized to isolate accumulator 13 from the outside, and third switch valve 22 is energized to connect booster chamber 3 to control valve 8. At this time, both atmospheric pressure chamber 2 and booster chamber 3 are connected to drain port 7, thereby depressurizing atmospheric pressure chamber 2 and booster chamber 3.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hydraulic booster device, comprising a housing (1), characterized in that: The shell (1) is provided with a normal pressure chamber (2), and the shell (1) is also provided with a boost chamber (3) connected to the normal pressure chamber (2). A piston rod (4) is slidably connected in the boost chamber (3). The shell (1) is provided with an oil inlet (5) for hydraulic oil to flow into the normal pressure chamber (2) so as to drive the piston rod (4) to be squeezed into the boost chamber (3). The shell (1) is provided with an oil outlet (6) for high-pressure hydraulic oil to be output from the boost chamber (3) to the outside. The shell (1) is provided with an oil drain port (7) for hydraulic oil to flow out of the boost chamber (3). The shell (1) is provided with a control valve (8) for controlling the flow direction of hydraulic oil to drive the piston to reciprocate. The oil inlet (5), the normal pressure chamber (2), the oil drain port (7) and the boost chamber (3) are all connected to the control valve (8).

2. A hydraulic booster device according to claim 1, characterized in that: The control valve (8) comprises a first valve (9) and a second valve (10); the first valve (9) connects the oil inlet (5) with the normal pressure chamber (2); the first valve (9) connects the oil drain port (7) with the pressure chamber (3); the second valve (10) connects the oil inlet (5) with the pressure chamber (3); and the second valve (10) connects the oil drain port (7) with the normal pressure chamber (2).

3. A hydraulic booster device according to claim 2, characterized in that: The control valve (8) further comprises a third valve (11), wherein the third valve (11) closes the oil inlet (5) and connects the normal pressure chamber (2), the boost chamber (3) and the oil drain port (7), and the third valve (11) is used for depressurizing the normal pressure chamber (2) and the boost chamber (3).

4. A hydraulic booster device according to claim 1, characterized in that: The housing (1) is provided with a first one-way valve (12) for allowing hydraulic oil to flow from the oil inlet (5) to the control valve (8) in one direction.

5. A hydraulic booster device according to claim 4, characterized in that: An accumulator (13) for absorbing input hydraulic pressure is arranged on the housing (1), and the accumulator (13) is connected to the output end of the first one-way valve (12).

6. A hydraulic booster device according to claim 5, characterized in that: A first switch valve (14) is provided between the accumulator (13) and the first one-way valve (12). When the first switch valve (14) loses power, hydraulic oil is unidirectionally conducted from the output end of the first one-way valve (12) to the accumulator (13). When the first switch valve (14) is energized, the output end of the first one-way valve (12) and the accumulator (13) are mutually conducted.

7. A hydraulic booster device according to claim 4, characterized in that: The housing (1) is provided with a pressure reducing valve (15) for stabilizing the input hydraulic pressure, the input end of the pressure reducing valve (15) is connected to the output end of the first one-way valve (12), and the output end of the pressure reducing valve (15) is connected to the control valve (8).

8. The hydraulic booster device according to claim 1, characterized in that: The housing (1) is provided with an overflow valve (16) for limiting the internal pressure of the normal pressure chamber (2).

9. A hydraulic booster device according to claim 1, characterized in that: The diameter of the normal pressure chamber (2) is larger than that of the boost chamber (3); a pressure plate (17) is integrally provided at one end of the piston rod (4) located in the normal pressure chamber (2); the circumferential outer wall of the pressure plate (17) contacts the inner wall of the normal pressure chamber (2); an oil return port (18) for oil discharge and return of the normal pressure chamber (2) is provided on the shell (1); the oil return port (18) is located on the side of the normal pressure chamber (2) close to the boost chamber (3).

10. The hydraulic booster device according to claim 1, characterized in that: The housing (1) is provided with a pressure sensor (19) for detecting the internal pressure of the normal pressure chamber (2).

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