Tandem pressure ratio variable low-fluctuation supercharger

Abstract

The utility model discloses a series-connection pressure ratio variable low-fluctuation supercharger which comprises a pressure applying end and a pressed end. The pressure applying end comprises a first pressure applying end and a second pressure applying end, the first pressure applying end and the second pressure applying end are connected in series through a pipeline, and a first piston rod of the first pressure applying end extends into an inner cavity of the pressed end; the sectional area of the pressurizing cavity of the second pressure applying end is larger than the sectional area of the inner cavity of the pressed end and smaller than the sectional area of the pressurizing cavity of the first pressure applying end. The supercharger has different pressure ratios of low pressure and high pressure, corresponding pressure ratios can be selected under different working conditions, the pressure fluctuation value can be reduced, especially the low-pressure working condition, and the product forming quality is improved.

Description

Technical Field

[0001] The utility model relates to a supercharger, in particular to a series pressure ratio variable low-fluctuation supercharger. Background Art

[0002] With the development of internal high (ultra-high) pressure molding technology, products in certain fields have increasingly higher requirements for molding water pressure during the molding process. For example, the molding process of some products is:

[0003] 1. Inject low-pressure water first: the water pressure fluctuation within 5Mpa-50Mpa is required to be ±0.5Mpa-±1Mpa.

[0004] 2. Then inject medium and high pressure water: the water pressure fluctuation value is required to be within 50Mpa-100Mpa and is ±3Mpa.

[0005] 3. Finally, inject ultra-high pressure water: the water pressure fluctuation value is required to be ±5Mpa when it is above >100Mpa.

[0006] The existing ultra-high pressure supercharger has a constant and large ratio of oil pressure to water pressure, which cannot meet the water pressure requirements of some products:

[0007] For example, when the water pressure needs to reach 250Mpa, based on the maximum operating pressure of the hydraulic system of 25Mpa, the ratio of the oil pressure of the booster to the water pressure is 1:10, or even higher. Assuming that the oil pressure fluctuation of the hydraulic system is ±0.3Mpa, the water pressure fluctuation value is: ±0.3MpaX10=±3Mpa>±1Mpa, which far exceeds the limit of low-pressure working conditions and does not meet the requirements of low-pressure working conditions. The product quality needs to be improved. Utility Model Content

[0008] The purpose of the present utility model is to overcome the above-mentioned problems and provide a series pressure ratio variable low-fluctuation supercharger, which has different low and high pressure ratios and can select the corresponding pressure ratio under different working conditions, which is beneficial to reducing the pressure fluctuation value, especially under low-pressure working conditions, and improving the quality of product molding.

[0009] The purpose of the utility model is achieved through the following technical solutions:

[0010] A series variable pressure ratio low-fluctuation supercharger, comprising a pressure-applying end and a pressure-receiving end; characterized in that:

[0011] The pressure-applying end includes a first pressure-applying end and a second pressure-applying end, the first pressure-applying end and the second pressure-applying end are connected in series through a pipeline, and the first pressure-applying end is provided with an independent boost input pipeline; the first piston rod of the first pressure-applying end extends into the inner cavity of the pressure-receiving end; the cross-sectional area of ​​the boost chamber of the second pressure-applying end is larger than the cross-sectional area of ​​the inner cavity of the pressure-receiving end and smaller than the cross-sectional area of ​​the boost chamber of the first pressure-applying end.

[0012] In a preferred embodiment of the present invention, the first pressure-applying end includes a first cylinder, a first piston and a first piston rod, one end of the first piston rod is fixed to the first piston, and the other end of the first piston rod extends into the inner cavity of the pressure-receiving end.

[0013] In a preferred embodiment of the present invention, the second pressure-applying end includes a second cylinder, a second piston, and a second piston rod, and the rodless cavity of the second cylinder is connected to the rodless cavity of the first cylinder through a pipeline; the cross-sectional area of ​​the rod cavity of the second cylinder is larger than the cross-sectional area of ​​the inner cavity of the pressure-receiving end and smaller than the cross-sectional area of ​​the rodless cavity of the first cylinder;

[0014] Under low-pressure conditions, the pressurized medium enters the rod chamber of the second cylinder, driving the pressurized medium in the rodless chamber of the second cylinder into the rodless chamber of the first cylinder; under high-pressure conditions, the pressurized medium directly enters the rodless chamber of the second cylinder to push the first piston for pressurization.

[0015] The working principle of the above series pressure ratio variable low fluctuation supercharger is as follows:

[0016] Under low-pressure conditions, hydraulic oil is injected into the rod chamber of the second cylinder body. The hydraulic oil pushes the second piston forward, and the pressure medium in the rodless chamber of the second cylinder body is pushed into the rodless chamber of the first cylinder body through the second piston, and then pushes the first piston forward, and the pressure medium in the inner chamber of the pressure end is pressurized through the first piston rod. Under this working condition, assuming that the ratio of the cross-sectional area of ​​the rod cavity of the second cylinder to the cross-sectional area of ​​the rodless cavity of the second cylinder is 1:5.6 (the pressure ratio is 5.6:1), the ratio of the cross-sectional area of ​​the rodless cavity of the second cylinder to the cross-sectional area of ​​the rodless cavity of the first cylinder is 1:1 (the pressure ratio is 1:1), and the ratio of the cross-sectional area of ​​the rodless cavity of the first cylinder to the cross-sectional area of ​​the inner cavity of the pressure end is 12.5:1 (the pressure ratio is 1:12.5); the oil pressure fluctuation is ±0.3Mpa, then the water pressure fluctuation value is ±0.3Mpa÷5.6X12.5=±0.67Mpa﹤±1Mpa, which meets the requirements of low-pressure working conditions.

[0017] Under high-pressure conditions, hydraulic oil is injected into the rodless chamber of the first cylinder. This oil pushes the first piston forward, increasing the pressure of the pressurized medium in the pressure-receiving end cavity through the first piston rod. Under these conditions, assuming the ratio of the cross-sectional area of ​​the rodless chamber of the first cylinder to the cross-sectional area of ​​the pressure-receiving end cavity is 12.5:1 (a pressure ratio of 1:12.5), and the oil pressure fluctuation is ±0.3 MPa, then the water pressure fluctuation is ±0.3 MPa x 12.5 = ±3.75 MPa, which is less than ±5 MPa, meeting the high-pressure operating requirements.

[0018] In a preferred embodiment of the present invention, the second piston and the second piston rod are integrally arranged.

[0019] In a preferred embodiment of the present invention, the ratio of the cross-sectional area of ​​the rod cavity of the second cylinder to the cross-sectional area of ​​the rodless cavity of the second cylinder is less than or equal to 1:6.

[0020] In a preferred embodiment of the present invention, the ratio of the cross-sectional area of ​​the rodless cavity of the second cylinder body to the cross-sectional area of ​​the rodless cavity of the first cylinder body is less than or equal to 1:1.

[0021] In a preferred embodiment of the present invention, the ratio of the cross-sectional area of ​​the rodless cavity of the first cylinder body to the cross-sectional area of ​​the inner cavity of the pressure-receiving end is greater than or equal to 1:1.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The utility model provides a series pressure ratio variable low-fluctuation supercharger by setting two pressure-applying ends with different cross-sectional areas and connected in series. The hydraulic oil can be injected into different pressure-applying ends respectively to obtain different pressure ratios, which is beneficial to reducing the pressure fluctuation value, especially in low-pressure working conditions, and improving the quality of product molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1-2 This is a cross-sectional view of the different working conditions of the series variable pressure ratio low-fluctuation supercharger of the present invention, where the arrows indicate the flow direction of the hydraulic oil. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with embodiments and drawings, but the implementation methods of the present invention are not limited thereto.

[0026] See also Figure 1-2 The series pressure ratio variable low-fluctuation supercharger of this embodiment includes a pressure-applying end (oil cylinder) and a pressure-receiving end (water cylinder 1); the pressure-applying end includes a first pressure-applying end and a second pressure-applying end, that is, a first oil cylinder and a second oil cylinder, the first pressure-applying end includes a first cylinder body 2, a first piston 3 and a first piston rod 4, and the first cylinder body 2 is provided with an independent boost input pipeline; one end of the first piston rod 4 is fixed on the first piston 3, and the other end of the first piston rod 4 extends into the inner cavity of the water cylinder 1; the second pressure-applying end includes a second cylinder body 5, a second piston 6 and a second piston rod, and the second piston 6 and the second piston rod are integrated; the rodless cavity of the second cylinder body 5 is connected to the rodless cavity of the first cylinder body 2 through a pipeline 7; the cross-sectional area of ​​the rod cavity of the second cylinder body 5 is larger than the cross-sectional area of ​​the inner cavity of the water cylinder 1 and smaller than the cross-sectional area of ​​the rodless cavity of the first cylinder body 2.

[0027] Under low-pressure conditions, the pressurized medium enters the rod chamber of the second cylinder 5, driving the pressurized medium in the rodless chamber of the second cylinder 5 into the rodless chamber of the first cylinder 2; under high-pressure conditions, the pressurized medium directly enters the rodless chamber of the second cylinder 5 to push the first piston 3 for pressurization.

[0028] Furthermore, the ratio of the cross-sectional area of ​​the rod cavity of the second cylinder 5 to the cross-sectional area of ​​the rodless cavity of the second cylinder 5 is less than or equal to 1:6.

[0029] Furthermore, the ratio of the cross-sectional area of ​​the rodless cavity of the second cylinder 5 to the cross-sectional area of ​​the rodless cavity of the first cylinder 2 is less than or equal to 1:1.

[0030] Furthermore, the ratio of the cross-sectional area of ​​the rodless cavity of the first cylinder body 2 to the cross-sectional area of ​​the inner cavity of the water cylinder 1 is greater than or equal to 1:1.

[0031] See also Figure 1-2 The working principle of the series variable pressure ratio low-fluctuation supercharger of this embodiment is as follows:

[0032] Under low pressure conditions, inject hydraulic oil into the rod chamber of the second cylinder 5, as shown in FIG. Figure 1 The hydraulic oil pushes the second piston 6 forward, and pushes the pressurized medium in the rodless chamber of the second cylinder 5 into the rodless chamber of the first cylinder 2 through the second piston 6, and then pushes the first piston 3 forward, and pressurizes the pressurized medium in the inner chamber of the water cylinder 1 through the first piston rod 4. Under this working condition, assuming that the ratio of the cross-sectional area of ​​the rod cavity of the second cylinder body 5 to the cross-sectional area of ​​the rodless cavity of the second cylinder body 5 is 1:5.6 (the pressure ratio is 5.6:1), the ratio of the cross-sectional area of ​​the rodless cavity of the second cylinder body 5 to the cross-sectional area of ​​the rodless cavity of the first cylinder body 2 is 1:1 (the pressure ratio is 1:1), and the ratio of the cross-sectional area of ​​the rodless cavity of the first cylinder body 2 to the cross-sectional area of ​​the inner cavity of the water cylinder 1 is 12.5:1 (the pressure ratio is 1:12.5); the oil pressure fluctuation is ±0.3Mpa, then the water pressure fluctuation value is ±0.3Mpa÷5.6X12.5=±0.67Mpa﹤±1Mpa, which meets the requirements of low-pressure working conditions.

[0033] Under high pressure conditions, hydraulic oil is injected into the rodless cavity of the first cylinder 2 through an independent booster input line. Figure 2 , hydraulic oil pushes first piston 3 forward, increasing the pressure of the pressurized medium in water cylinder 1 via first piston rod 4. Under this operating condition, assuming the ratio of the cross-sectional area of ​​the rodless cavity of first cylinder body 2 to the cross-sectional area of ​​the inner cavity of water cylinder 1 is 12.5:1 (a pressure ratio of 1:12.5), and the oil pressure fluctuation is ±0.3 MPa, then the water pressure fluctuation is ±0.3 MPa x 12.5 = ±3.75 MPa < ±5 MPa, meeting the high-pressure operating requirements.

[0034] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A series pressure ratio variable low fluctuation supercharger, comprising a pressure-applying end and a pressure-receiving end; characterized in that: The pressure-applying end includes a first pressure-applying end and a second pressure-applying end, the first pressure-applying end and the second pressure-applying end are connected in series through a pipeline, and the first piston rod of the first pressure-applying end extends into the inner cavity of the pressure-receiving end; the cross-sectional area of ​​the boosting cavity of the second pressure-applying end is larger than the cross-sectional area of ​​the inner cavity of the pressure-receiving end and smaller than the cross-sectional area of ​​the boosting cavity of the first pressure-applying end.

2. The series variable pressure ratio low-fluctuation supercharger according to claim 1, characterized in that: The first pressure-applying end includes a first cylinder, a first piston and a first piston rod. One end of the first piston rod is fixed to the first piston, and the other end of the first piston rod extends into the inner cavity of the pressure-receiving end.

3. The series variable pressure ratio low-fluctuation supercharger according to claim 2, characterized in that: The second pressure-applying end includes a second cylinder, a second piston, and a second piston rod. The rodless cavity of the second cylinder is connected to the rodless cavity of the first cylinder through a pipeline. The cross-sectional area of ​​the rod cavity of the second cylinder is larger than the cross-sectional area of ​​the inner cavity of the pressure-receiving end and smaller than the cross-sectional area of ​​the rodless cavity of the first cylinder. Under low-pressure conditions, the pressurized medium enters the rod chamber of the second cylinder, driving the pressurized medium in the rodless chamber of the second cylinder into the rodless chamber of the first cylinder; under high-pressure conditions, the pressurized medium directly enters the rodless chamber of the second cylinder to push the first piston for pressurization.

4. The series variable pressure ratio low-fluctuation supercharger according to claim 3, characterized in that: The second piston and the second piston rod are integrally provided.

5. The series variable pressure ratio low-fluctuation supercharger according to claim 3, characterized in that: The ratio of the cross-sectional area of ​​the rod cavity of the second cylinder to the cross-sectional area of ​​the rodless cavity of the second cylinder is less than or equal to 1:

6.

6. The series variable pressure ratio low-fluctuation supercharger according to claim 3, characterized in that: The ratio of the cross-sectional area of ​​the rodless cavity of the second cylinder to the cross-sectional area of ​​the rodless cavity of the first cylinder is less than or equal to 1:

1.

7. The series variable pressure ratio low-fluctuation supercharger according to claim 1, characterized in that: The ratio of the cross-sectional area of ​​the rodless cavity of the first cylinder body to the cross-sectional area of ​​the inner cavity of the pressure-receiving end is greater than or equal to 1:1.

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