Hydraulically-driven reciprocating air compressor

[0016] See Figure 1-3 , The present invention provides a hydraulically driven reciprocating air compressor, comprising a connecting block 9, the left and right ends of the connecting block 9 are respectively installed with a first cylinder 10 and a second cylinder 11; inside the connecting block 9 The piston rod 12 is slidably connected to the piston rod 12, the left end of the piston rod 12 is located in the first cylinder 10, and the right end of the piston rod 12 is located in the second cylinder 11; the first cylinder 10 is slidably connected to the piston A first piston 13 connected to the left end of the rod 12, a second piston 14 connected to the right end of the piston rod 12 is slidably connected in the second cylinder 11; the connecting block 9 is provided for controlling the piston rod 12, a reversing valve 15 that reciprocates left and right; the left end of the first cylinder 10 is equipped with a first check valve 16 for controlling air to enter the rodless cavity of the first cylinder 10 and a first check valve 16 for controlling air discharge. The second one-way valve 17 of the rodless cavity of the first cylinder block 10, the right end of the second cylinder block 11 is installed with a third one-way valve 18 for controlling air to enter the rodless cavity of the second cylinder block 11 and The fourth one-way valve 19 in the rodless cavity of the second cylinder 11 is used to control the air discharge; the integral connection structure of the first cylinder 10 and the second cylinder 11 of the air compressor is more compact by the above arrangement, and the first piston The reciprocating movement of the 13 and the second piston 14 does not require electronic control. The reversing valve 15 includes a valve body 1 with P port, A port, B port, and T port inside. The left and right ends of the valve body 1 are respectively installed with a first plug 7a and a second plug 7b, the valve body 1 is slidably connected with a valve core 3 for controlling the on-off of the oil port; the side of the valve core 3 is provided with a first shoulder 3a, a second shoulder 3b, and a Three shoulders 3c, a first control cavity 1a is formed between the first shoulder 3a and the first plug 7a, a second control cavity 1b is formed between the third shoulder 3c and the second plug 7b, and the valve core 3 is provided with There is a first flow passage 3.1 communicating with the first control chamber 1a and a second flow passage 3.5 communicating with the second control chamber 1b; when the spool 3 is at the right position, the P port is connected to the B port, and the A port is connected to the T When the valve core 3 is at the left position, the P port communicates with the A port, and the B port communicates with the T port; the valve core 3 is provided with a first connecting the first flow passage 3.1 and the A port Flow hole 3.2; the side of the second shoulder 3b and the third shoulder 3c are respectively provided with a second flow hole 3.3 and a third flow hole 3.4 communicating with the second flow passage 3.5; the left and right movement of the valve core 3 The connection between the second through hole 3.3 and the P port and the third through hole 3.4 and the T port can be changed; the valve body 1 is also equipped with a spring centering device for controlling the spool 3 in the initial position .

[0017] When the spool 3 is in the initial position, the second through hole 3.3 communicates with the P port, and the third through hole 3.4 communicates with the T port; when the spool 3 moves to the left from the initial position, the second through hole 3.3 Keep communicating with the P port, the third through hole 3.4 is gradually separated from the T port; when the spool 3 moves to the right from the initial position, the second through hole 3.3 is gradually separated from the P port, and the third through hole 3.4 Keep communicating with T port.

[0018] The spring centering device includes a first spring 6a and a first gasket 2a located in the first control chamber 1a, and a second spring 6b and a second gasket 2b located in the second control chamber 1b; the first gasket 2a It is sleeved on the small diameter of the left end of the valve core 3. One end of the first spring 6a is against the first gasket 2a, and the other end is against the first screw plug 7a; the second gasket 2b is sleeved on the small diameter of the right end of the valve core 3 On the upper side, one end of the second spring 6b abuts on the second washer 2b, and the other end abuts on the second plug 7b.

[0019] The valve core 3 is provided with a first damper 4a in the first flow passage 3.1, and the first damper 4a is provided with a first orifice 4a1; the valve core 3 is provided with a second damper 4b in the second flow passage 3.5. The second damper 4b is provided with a second damping hole 4b1.

[0020] The connecting block 9 is provided with a second flow passage 902 for connecting the A oil port with the rod cavity of the second cylinder 11, and for connecting the B oil port with the first cylinder 10 There is a first flow channel 901 with a rod cavity.

[0021] When in use, connect the P oil port and the T oil port to the hydraulic oil source. The A oil port and the B oil port are respectively connected with the rod cavity of the second cylinder 21 and the rod cavity of the first cylinder 20, at the P oil port Before the oil is supplied, the reversing valve 15 is placed in the initial position by the spring centering device, the second through hole 3.3 communicates with the P port, and the third through hole 3.4 communicates with the T port; when the P oil When the oil enters the port, the oil enters the second control chamber 1b through the second through hole 3.3 and the second orifice 4b1. The oil in the first control chamber 1a flows into the A port through the first orifice 4a1, and the spool 3 is in The pressure difference between P port and A port begins to move to the left. The third through hole 3.4 is gradually separated from port T, causing the pressure of the second control chamber 1b to become higher and higher, and finally equal to the pressure of P port. 3 When moving to the left limit, the P port is connected to the A port, and the B port is connected to the T port, so that the pressure in the rod cavity of the second cylinder 11 rises and drives the second piston 14 to move to the right. The air in the rodless cavity of the cylinder 11 is compressed and discharged. At the same time, the first piston 13 in the first cylinder 10 is driven to move to the right by the piston rod 12, so that a negative pressure is formed in the rodless cavity of the first cylinder 10 The pressure in turn draws air in. When the second piston 14 moves to the right to the end, the oil no longer flows, the pressure difference between the P port and the A port disappears, and the spool 3 starts to move to the right under the action of the spring centering device, while During the right movement, the third flow hole 3.4 is connected to the T port so that the pressure of the second control chamber 1b is lower than the pressure of the first control chamber 1a, and the spool 3 continues to move to the right limit position. At this time, the second flow The hole 3.3 is separated from the P port, the second control chamber 1b has the same pressure as the T port, the P port is connected to the B port, the A port is connected to the T port, and the pressure difference between the A port and the T port Keep the spool 3 at the right limit position, so that the pressure in the rod cavity of the first cylinder 10 rises, and the first piston 13 is driven to move to the left to compress and discharge the air in the rodless cavity of the first cylinder 10, At the same time, the second piston 14 in the second cylinder 11 is driven to move to the left by the piston rod 12, so that a negative pressure is formed in the rodless cavity of the second cylinder 11 to suck air in. When the first piston 13 moves to the left to the end, the oil no longer flows. The pressure difference between the A port and the T port disappears, and the spool 3 moves to the left to the initial position under the action of the spring centering device. Circulation, the piston rod 12 automatically moves back and forth under the control of the present invention, without electronic control.

[0022] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principles of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.