Pneumatic hydraulic pump
By adopting a combination design of cylinder and oil cylinder structure and pilot valve, air-controlled reversing valve and throttle valve in the pneumatic hydraulic pump, the problem of valve core failure to be fully reversed due to unstable gas source pressure is solved, and the stable operation of the equipment and energy consumption reduction is achieved.
Patent Information
- Application Number
- CN202422563508.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-10-23
AI Technical Summary
The existing pneumatic hydraulic pumps are prone to failing to fully reversal when the air source pressure is unstable or when the first power is turned on, resulting in the problem of equipment failure. The driving motor needs to continue to work to maintain the oil pressure output, resulting in waste of energy consumption.
The cylinder and oil cylinder structure design is adopted, combined with the combination of the top pilot valve, the bottom pilot valve, the air-controlled reversing valve and the throttle valve, to ensure that the valve core of the air-controlled reversing valve always maintains a stable position during the movement of the cylinder piston. The throttle valve is continuously replenished, preventing the valve core from resetting after the air source is closed, and achieving stable pressure output.
Ensure that the valve core of the air-controlled reversing valve is always in place during the movement of the cylinder piston, avoid equipment failure, reduce energy consumption, and achieve stable hydraulic output.
Smart Images
Figure CN223048946U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pressure output devices, and particularly refers to a pneumatic hydraulic pump. Background Art
[0002] The working principle of a gas-liquid booster is similar to that of a pressure booster. A very low pressure is applied to a large-diameter air-driven piston. When this pressure acts on a small-area piston, a high pressure is generated. A hydraulic station is a hydraulic source device composed of a hydraulic pump, a driving electric motor, an oil tank, a direction valve, a throttle valve, a relief valve, etc., or a hydraulic device including a control valve. Currently in the market, the booster pump is used as a component, and different models need to be selected according to the usage conditions of customers. The hydraulic device can directly provide stable hydraulic pressure to the customer's machine. However, when the hydraulic device works, the driving electric motor needs to work continuously to ensure a stable oil pressure output. For equipment with intermittent work, this kind of hydraulic station is too energy-consuming. Based on this, the market needs a hydraulic station with low energy consumption that can be directly connected to the customer's equipment.
[0003] Chinese Patent: Pneumatic Hydraulic Pump, Patent No. ZL2006300925893. When the external air source enters the left air chamber through the outlet A of the five-port double-air-controlled pneumatic directional control valve, the cylinder piston moves to the right, and at the same time drives the oil cylinder plunger to move to the right. A vacuum is formed in the oil cylinder, and the oil suction check valve opens to suck the hydraulic oil into the oil cylinder cavity. When the cylinder piston collides with the pilot valve needle, the valve changes direction, and the control signal P is connected to K, causing the five-port double-air-controlled pneumatic directional control valve to change direction. At this time, the external air source enters the right air chamber, causing the cylinder piston to drive the oil cylinder plunger to move to the left. The oil suction check valve closes, and the oil outlet check valve opens to deliver the pressure oil. When the cylinder piston collides with the pilot valve needle installed on the right pump body, the valve changes direction to control the five-port double-air-controlled pneumatic directional control valve to change direction, and thus reciprocates automatically. When the output hydraulic oil pressure... However, the following problems exist in the use of this structure: When the cylinder piston hits the pilot valve needle, the pilot valve is connected, the pneumatic directional control valve changes direction, and the air circuit changes direction. However, when the air source pressure is unstable, the spool of the pneumatic directional control valve has not fully changed direction, but the cylinder piston has left the pilot valve, resulting in the spool position of the pneumatic directional control valve not moving in place, and the P port of the pneumatic directional control valve is simultaneously connected to the A and B ports, causing the pneumatic directional control valve to fail in the middle position. There is also another situation: When starting up for the first time, if the pneumatic directional control valve was connected to the left working position before shutdown, and the gas in the pneumatic directional control valve leaked through the pipeline for a long time, resulting in the gas pressure in the pneumatic directional control valve being balanced with its spring force, and the spool of the pneumatic directional control valve being exactly in the middle position, then the pneumatic directional control valve will fail when starting up for the first time. Summary of the Utility Model
[0004] In view of the above problems, the present utility model provides a pneumatic hydraulic pump to solve one or more technical problems existing in the prior art and at least provide a beneficial alternative or create conditions.
[0005] To achieve the above object, the technical solution adopted by the present utility model is as follows:
[0006] A pneumatic hydraulic pump includes a cylinder and an oil cylinder. A cylinder piston is arranged in the cylinder, and an oil cylinder piston is arranged in the oil cylinder. The cylinder piston and the oil cylinder piston are connected by a connecting rod. The cross-sectional area of the inner cavity of the cylinder is larger than that of the inner cavity of the oil cylinder. A top pilot valve is arranged at the top of the cylinder, and a bottom pilot valve is arranged at the bottom of the cylinder. Both the top pilot valve and the bottom pilot valve are normally closed. It is characterized in that: it further includes a pneumatic control reversing valve and a throttle valve. The air source is connected to the pneumatic control reversing valve through the top pilot valve to push the valve core to move. The air source is respectively connected to the upper chamber and the lower chamber of the cylinder through the pneumatic control reversing valve. The bottom pilot valve is connected to the pneumatic control reversing valve to exhaust the gas in the pneumatic control reversing valve. The throttle valve is connected between the upper chamber of the cylinder and the pneumatic control reversing valve. The oil cylinder is connected to the output end.
[0007] The present utility model also provides a pneumatic hydraulic pump, which includes a cylinder and an oil cylinder. A cylinder piston is arranged in the cylinder, and an oil cylinder piston is arranged in the oil cylinder. The cylinder piston and the oil cylinder piston are connected by a connecting rod. The cross-sectional area of the inner cavity of the cylinder is larger than that of the inner cavity of the oil cylinder. A top pilot valve is arranged at the top of the cylinder, and a bottom pilot valve is arranged at the bottom of the cylinder. Both the top pilot valve and the bottom pilot valve are normally closed. It is characterized in that: it further includes a pneumatic control reversing valve and a low-leakage high-sealing valve. The air source is connected to the pneumatic control reversing valve through the top pilot valve to push the valve core to move. The air source is respectively connected to the upper chamber and the lower chamber of the cylinder through the pneumatic control reversing valve. The bottom pilot valve is connected to the pneumatic control reversing valve to exhaust the gas in the pneumatic control reversing valve. The low-leakage high-sealing valve is connected to the pneumatic control reversing valve. The oil cylinder is connected to the output end.
[0008] Preferably, when the left working position of the pneumatic control reversing valve is connected, the air source is connected to the upper chamber of the cylinder through the pneumatic control reversing valve, and the lower chamber of the cylinder is then connected to the outside through the pneumatic control reversing valve. When the right working position of the pneumatic control reversing valve is connected, the air source is connected to the lower chamber of the cylinder through the pneumatic control reversing valve, and the upper chamber of the cylinder is then connected to the outside through the pneumatic control reversing valve. The pneumatic control reversing valve is located at the right working position when it is not ventilated.
[0009] Preferably, both the top pilot valve and the bottom pilot valve protrude towards the inner cavity of the cylinder.
[0010] Preferably, both the top and the bottom of the cylinder piston are made of aluminum plates.
[0011] Preferably, an accumulator is connected in parallel at the output end.
[0012] Preferably, the pneumatic control reversing valve is a two-position five-way valve.
[0013] Advantages of the utility model:
[0014] 1. When the cylinder piston of the utility model moves downward, the throttle valve connected between the upper chamber of the cylinder and the pneumatic control reversing valve is used to ensure the pressure at the control end of the pneumatic control reversing valve, ensuring that the spool of the pneumatic control reversing valve moves in place, enabling the full output of pipeline air pressure and ensuring the stability of equipment operation.
[0015] 2. The utility model ensures that after the air source is shut down, the spool of the pneumatic control reversing valve resets, avoiding the failure of the pneumatic control reversing valve. Description of the drawings
[0016] Figure 1 is the pipeline schematic diagram of Embodiment 1;
[0017] Figure 2 is the pipeline schematic diagram of Embodiment 2. Detailed implementation manners
[0018] The technical solutions of the utility model will be described below in conjunction with the drawings and embodiments.
[0019] Embodiment 1: Refer to Figure 1, a pneumatic-hydraulic pump according to this embodiment includes a cylinder 1 and an oil cylinder 2. The cylinder 1 is above and the oil cylinder 2 is below. The two cylinder bodies are connected integrally. A cylinder piston 3 is provided in the cylinder 1, and an oil cylinder piston 4 is provided in the oil cylinder 2. The cylinder piston 3 and the oil cylinder piston 4 are connected by a connecting rod 5. The cross-sectional area of the inner cavity of the cylinder 1 is larger than that of the inner cavity of the oil cylinder 2. A top pilot valve 6 is provided at the top of the cylinder 1, and a bottom pilot valve 7 is provided at the bottom of the cylinder 1. Both the top pilot valve 6 and the bottom pilot valve 7 communicate with the inner cavity of the cylinder 1. Both the top pilot valve 6 and the bottom pilot valve 7 are in a normally closed state. It also includes a pneumatic control reversing valve 8 and a throttle valve 9. The air source is connected to the pneumatic control reversing valve 8 through the top pilot valve 6 to push its spool to move. The pneumatic control reversing valve 8 is a two-position five-way valve. The air source is connected to the upper chamber and the lower chamber of the cylinder 1 through the pneumatic control reversing valve 8 respectively. When the gas in the pneumatic control reversing valve 8 is exhausted, its right working position works, that is, its right working position works when the pneumatic control reversing valve 8 is not ventilated. When the gas is filled into the pneumatic control reversing valve 8, its left working position works. When the left working position of the pneumatic control reversing valve 8 is connected and working, the air source is connected to the upper chamber of the cylinder 1 through the pneumatic control reversing valve 8, and the lower chamber of the cylinder 1 is then connected to the outside through the pneumatic control reversing valve 8. When the right working position of the pneumatic control reversing valve 8 is connected and working, the air source is connected to the lower chamber of the cylinder 1 through the pneumatic control reversing valve 8, and the upper chamber of the cylinder 1 is then connected to the outside through the pneumatic control reversing valve 8. The bottom pilot valve 7 is connected to the pneumatic control reversing valve 8. When the valve needle of the bottom pilot valve 7 is hit, the bottom pilot valve 7 communicates with the outside to exhaust the gas of the pneumatic control reversing valve 8. The pneumatic control reversing valve 8 works in its right working position under the action of its spring force. The throttle valve 9 is connected between the upper chamber of the cylinder 1 and the pneumatic control reversing valve 8. When the upper chamber of the cylinder 1 is connected to the air source, the air source continuously supplies gas to the pneumatic control reversing valve 8 through the throttle valve 9, so that the spool of the pneumatic control reversing valve 8 continuously maintains the left working position under the action of overcoming the spring force. The oil cylinder 2 is connected to the output end, and an accumulator 10 is connected in parallel at the output end to ensure stable pressure output.
[0020] Preferably, both the top pilot valve 6 and the bottom pilot valve 7 protrude towards the inner cavity direction of the cylinder 1. Both the top and bottom of the cylinder piston 3 are made of aluminum plates, which makes it easy to open the top pilot valve 6 and the bottom pilot valve 7.
[0021] When the device stops, the pneumatic control reversing valve 8 is in the right working position. At the beginning of operation, the air source enters the lower chamber of the cylinder 1 through the pneumatic control reversing valve 8. The cylinder piston 3 moves upward, hits the top pilot valve 6 and connects the pipeline. The air source enters the pneumatic control reversing valve 8 through the top pilot valve 6. The pneumatic control reversing valve 8 works in the left working position. The air source enters the upper chamber of the cylinder 1 through the pneumatic control reversing valve 8. The cylinder piston 3 moves downward, and the top pilot valve 6 closes. The air source continuously supplies air to the pneumatic control reversing valve 8 through the throttle valve 9, so that the pneumatic control reversing valve 8 is in the maximum switch position. The cylinder piston 3 moves downward and hits the bottom pilot valve 7. The gas of the pneumatic control valve is emptied. The spool of the pneumatic control reversing valve 8 switches to the right working position under the action of its spring. The gas enters the lower chamber of the cylinder 1 through the pneumatic control reversing valve 8. The cylinder piston 3 moves upward, and the bottom pilot valve 7 disconnects, and it works reciprocally in this way.
[0022] Embodiment 2: Refer to Figure 2 , a pneumatic-hydraulic pump, comprising a cylinder 1 and an oil cylinder 2. A cylinder piston 3 is arranged in the cylinder 1, and an oil cylinder piston 4 is arranged in the oil cylinder 2. The cylinder piston 3 and the oil cylinder piston 4 are connected by a connecting rod 5. The cross-sectional area of the inner cavity of the cylinder 1 is larger than that of the inner cavity of the oil cylinder 2. A top pilot valve 6 is arranged at the top of the cylinder 1, and a bottom pilot valve 7 is arranged at the bottom of the cylinder 1. Both the top pilot valve 6 and the bottom pilot valve 7 are normally closed. It is characterized in that: it further comprises a pneumatic control reversing valve 8 and a low-leakage high-sealing valve 11. The air source is connected to the pneumatic control reversing valve 8 through the top pilot valve 6 to push the spool to move. The air source is respectively connected to the upper chamber and the lower chamber of the cylinder 1 through the pneumatic control reversing valve 8. The bottom pilot valve 7 is connected to the pneumatic control reversing valve 8 to empty the gas of the pneumatic control reversing valve 8. The low-leakage high-sealing valve 11 is connected to the pneumatic control reversing valve 8. The oil cylinder 2 is connected to the output end. The low-pressure setting pressure of the low-leakage high-sealing valve 11 is higher than the spring force of the pneumatic control reversing valve 8 but lower than the pressure of the air source. When the air source is closed, the pressure at the pneumatic control valve end gradually decreases. When it drops to the set pressure, the low-leakage high-sealing valve 11 empties the gas of the pneumatic control reversing valve 8, so that the right working position of the pneumatic control reversing valve 8 is connected, avoiding the failure of its spool being in the middle position.
[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it cannot be understood as a limitation to the present invention. In addition, "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more.
[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0025] The above has described in detail an embodiment of the present utility model, but the content described is only a preferred embodiment of the present utility model and cannot be considered as being used to limit the scope of implementation of the present utility model. Any equivalent changes and improvements made within the scope of the application of the present utility model should still fall within the scope covered by the patent of the present utility model.
Claims
1. A pneumatic hydraulic pump, comprising an air cylinder and an oil cylinder, wherein an air cylinder piston is arranged in the air cylinder, an oil cylinder piston is arranged in the oil cylinder, the air cylinder piston and the oil cylinder piston are connected by a connecting rod, the cross section of the inner cavity of the air cylinder is larger than the cross section of the inner cavity of the oil cylinder, and characterized in that: A top pilot valve is provided on the top of the cylinder, and a bottom pilot valve is provided on the bottom of the cylinder. Both the top pilot valve and the bottom pilot valve are in a normally closed state. The cylinder also includes an air-controlled reversing valve and a throttle valve. The air source is connected to the air-controlled reversing valve through the top pilot valve to push the valve core to move. The air source is connected to the upper chamber and the lower chamber of the cylinder respectively through the air-controlled reversing valve. The bottom pilot valve is connected to the air-controlled reversing valve to exhaust the gas of the air-controlled reversing valve. The throttle valve is connected between the upper chamber of the cylinder and the air-controlled reversing valve. The oil cylinder is connected to the output end.
2. A pneumatic hydraulic pump, comprising an air cylinder and an oil cylinder, wherein an air cylinder piston is arranged in the air cylinder, an oil cylinder piston is arranged in the oil cylinder, the air cylinder piston and the oil cylinder piston are connected by a connecting rod, the cross section of the inner cavity of the air cylinder is larger than the cross section of the inner cavity of the oil cylinder, characterized in that: A top pilot valve is provided on the top of the cylinder, and a bottom pilot valve is provided on the bottom of the cylinder. Both the top pilot valve and the bottom pilot valve are in a normally closed state. The cylinder also includes an air-controlled reversing valve and a low-leakage and high-sealing valve. The air source is connected to the air-controlled reversing valve through the top pilot valve to push the valve core to move. The air source is connected to the upper chamber and the lower chamber of the cylinder respectively through the air-controlled reversing valve. The bottom pilot valve is connected to the air-controlled reversing valve to exhaust the gas of the air-controlled reversing valve. The low-leakage and high-sealing valve is connected to the air-controlled reversing valve, and the oil cylinder is connected to the output end.
3. A pneumatic hydraulic pump according to claim 1 or 2, characterized in that: When the left position of the air-controlled reversing valve is connected, the air source is connected to the upper chamber of the cylinder through the air-controlled reversing valve, and the lower chamber of the cylinder is connected to the outside world through the air-controlled reversing valve. When the right position of the air-controlled reversing valve is connected, the air source is connected to the lower chamber of the cylinder through the air-controlled reversing valve, and the upper chamber of the cylinder is connected to the outside world through the air-controlled reversing valve. The air-controlled reversing valve is located in the right position when no air is ventilated.
4. A pneumatic hydraulic pump according to claim 1 or 2, characterized in that: The top pilot valve and the bottom pilot valve both protrude toward the inner cavity of the cylinder.
5. A pneumatic hydraulic pump according to claim 1 or 2, characterized in that: The top and bottom of the cylinder piston are both made of aluminum plates.
6. A pneumatic hydraulic pump according to claim 1 or 2, characterized in that: An energy accumulator is connected in parallel at the output end.
7. A pneumatic hydraulic pump according to claim 1 or 2, characterized in that: The air-controlled reversing valve is a two-position five-way valve.