Pneumatic control valve for booster oil pump

Abstract

The utility model relates to a pneumatic control valve for a booster oil pump. The pneumatic control valve comprises an air valve shell and an air valve core, the air valve element comprises a valve element body and a piston. A valve core cavity and a piston cavity which are communicated with each other are arranged in the air valve shell; the valve core body and the piston are correspondingly arranged in the valve core cavity and the piston cavity; the valve element is characterized in that a rod ventilation groove, a main ventilation groove and a rodless ventilation groove are sequentially formed in the valve element body from front to back; a rod exhaust hole, a main gas transmission hole, a rodless exhaust hole, a rod gas transmission hole, a mechanical valve vent hole and a rodless gas transmission hole are respectively formed in the side wall of the gas valve shell of the valve core cavity; a piston cavity exhaust hole and a piston cavity gas transmission hole are formed in the side wall of the gas valve shell; a piston cavity ventilation channel used for communication is arranged between the rear cavity of the piston cavity and the rodless air conveying hole, and a valve element cavity ventilation channel used for communication is arranged between the front cavity of the valve element cavity and the main air conveying hole. The air valve has the advantages that the air valve element is not prone to being blocked, abrasion between the air valve element and the air valve shell can be reduced, and the service life can be prolonged.

Description

Technical Field

[0001] The utility model relates to a pneumatic control valve, in particular to a pneumatic control valve for a supercharging oil pump. Background Art

[0002] At present, pneumatic supercharging oil pumps in industry are applied to hydraulic systems to achieve the purpose of pressure maintaining, and their energy consumption is very small. In the pneumatic control valve of the existing pneumatic supercharging oil pump, it includes a valve housing and a valve spool. A spool cavity is provided in the valve housing, and the valve spool is arranged in the spool cavity. An air inlet hole is provided on the valve housing at the front end of the valve spool. A valve spool air delivery through hole communicating with the air inlet hole is provided in the middle of the front end of the valve spool. A front air delivery hole and a rear air delivery hole communicating with the valve spool air delivery through hole are respectively provided on the valve spool. An air valve rod chamber ventilation hole, an air valve rodless chamber ventilation hole and an air valve exhaust hole are respectively provided on the side wall of the valve housing. A rear air valve chamber is provided at the rear end of the valve housing. This pneumatic control valve only has one air valve exhaust hole. When the valve spool is working, its working stroke is relatively long, so that the valve spool is prone to valve jamming during work. At the same time, after the working stroke is relatively long, the valve spool and the valve housing are prone to wear, thus shortening the service life. Summary of the Invention

[0003] Aiming at the above disadvantages, the purpose of the utility model is to provide a pneumatic control valve for a supercharging oil pump, in which the valve spool is not prone to valve jamming, the wear between the valve spool and the valve housing can be reduced, and the service life can be improved.

[0004] The technical content of the utility model is as follows: a pneumatic control valve for a supercharging oil pump, which includes a valve housing and a valve spool. The valve spool includes a spool body and a piston, and the piston is arranged at the rear end of the spool body. A spool cavity and a piston cavity which are communicated with each other are provided in the valve housing. The spool body and the piston are arranged in the corresponding spool cavity and piston cavity.

[0005] It is characterized in that a rod ventilation groove, a main ventilation groove and a rodless ventilation groove are successively arranged on the spool body from front to back. A rod exhaust hole, a main air delivery hole and a rodless exhaust hole are successively arranged on the side wall of the valve housing of the spool cavity from front to back. Corresponding to the rod exhaust hole, the main air delivery hole and the rodless exhaust hole, a rod air delivery hole, a mechanical valve ventilation hole and a rodless air delivery hole are successively arranged on the side wall of the valve housing of the spool cavity from front to back. A piston cavity exhaust hole communicating with the piston cavity is provided on the side wall of the valve housing of the front cavity of the piston cavity. A piston cavity air delivery hole communicating with the piston cavity is provided on the side wall of the valve housing of the rear cavity of the piston cavity. A piston cavity ventilation channel for communication is provided between the rear cavity of the piston cavity and the rodless air delivery hole. A spool cavity ventilation channel for communication is provided between the front cavity of the spool cavity and the main air delivery hole.

[0006] When the air valve core moves to the forefront of the valve core cavity, the rear cavity of the piston cavity is communicated with the main air inlet hole through the piston cavity air vent passage and the rodless air vent groove, and the front cavity of the valve core cavity is communicated with the main air inlet hole through the valve core cavity air vent passage and the main air vent groove; the rodless air inlet hole is communicated with the main air inlet hole through the rodless air vent groove; the rod air exhaust hole is communicated with the rod air inlet hole through the rod air vent groove; the mechanical valve air vent hole is communicated with the main air inlet hole through the main air vent groove; the rodless air exhaust hole is not communicated with the rodless air inlet hole;

[0007] When the air valve core moves to the rearmost end of the piston cavity, the front cavity of the valve core cavity is communicated with the main air inlet hole through the valve core cavity air vent passage and the main air vent groove; the rodless air exhaust hole is communicated with the rodless air inlet hole through the rodless air vent groove; the mechanical valve air vent hole is communicated with the main air inlet hole through the main air vent groove; the rod air exhaust hole is not communicated with the rod air inlet hole, and the piston cavity is not communicated with the main air inlet hole.

[0008] In the above pneumatic control valve for a supercharging oil pump, when the piston cavity air vent passage is entirely arranged in the air valve core, one end of the piston cavity air vent passage is communicated with the rear cavity of the piston cavity, and the other end of the piston cavity air vent passage is communicated with the rodless air vent groove,

[0009] When the piston cavity air vent passage is entirely arranged in the air valve housing, one end of the piston cavity air vent passage is communicated with the rear cavity of the piston cavity, and the other end of the piston cavity air vent passage is communicated with the rodless air inlet hole,

[0010] When the piston cavity air vent passage is partially arranged in the air valve housing, one end of the piston cavity air vent passage is communicated with the rear cavity of the piston cavity through the first through hole of the air valve housing, and the other end of the piston cavity air vent passage is communicated with the rodless air inlet hole through the second through hole of the air valve housing; the first through hole and the second through hole are connected by a trachea;

[0011] When the valve core cavity air vent passage is entirely arranged in the air valve core, one end of the valve core cavity air vent passage is communicated with the front cavity of the valve core cavity, and the other end of the valve core cavity air vent passage is communicated with the main air vent groove,

[0012] When the valve core cavity air vent passage is entirely arranged in the air valve housing, one end of the valve core cavity air vent passage is communicated with the front cavity of the valve core cavity, and the other end of the valve core cavity air vent passage is communicated with the main air inlet hole,

[0013] When the valve core cavity air vent passage is partially arranged in the air valve housing, one end of the valve core cavity air vent passage is communicated with the front cavity of the valve core cavity through the third through hole of the air valve housing, and the other end of the valve core cavity air vent passage is communicated with the main air inlet hole through the fourth through hole of the air valve housing; the third through hole and the fourth through hole are connected by a trachea.

[0014] In the above pneumatic control valve for a supercharging oil pump, in order to facilitate the movement of the air valve core, a convex block is provided at the rear end of the piston.

[0015] The advantages of the present utility model compared with the prior art are as follows: By providing two rows of air holes corresponding to the rod chamber and the rodless chamber of the booster oil pump respectively, and arranging the air inlet hole between the two rows of air holes, when the air valve core is working, its working stroke is relatively short, it is not easy to generate a stuck valve phenomenon during operation, and the wear between the air valve core and the air valve housing can be reduced, thereby prolonging the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the air valve core in the present utility model when it is in the completely forward limit state.

[0017] Figure 2 It is a schematic structural diagram of the air valve core in the present utility model when it is in the completely rearward limit state.

[0018] Figure 3 It is another schematic structural diagram of the present utility model.

[0019] Figure 4 It is another schematic structural diagram of the present utility model.

[0020] Figure 5 It is a schematic structural diagram of the air valve core in the pneumatic booster oil pump when it is in the completely forward limit state.

[0021] Figure 6 It is a schematic structural diagram of the air valve core in the pneumatic booster oil pump when it is in the completely rearward limit state. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] As Figure 1 and Figure 2 As shown in

[0023] It is characterized in that a rod-bearing ventilation groove 2.11, a main ventilation groove 2.12 and a rodless ventilation groove 2.13 are successively arranged on the valve core body 2.1 from front to back; a rod-bearing exhaust hole 1.11, a main air inlet hole 1.12 and a rodless exhaust hole 1.13 are successively arranged on the side wall of the air valve housing 1 of the valve core cavity 1.1 from front to back. Correspondingly, a rod-bearing air inlet hole 1.21, a mechanical valve ventilation hole 1.22 and a rodless air inlet hole 1.23 are successively arranged on the side wall of the air valve housing 1 of the valve core cavity 1.1 from front to back; a piston cavity exhaust hole 1.3 is arranged on the side wall of the air valve housing 1 of the front cavity of the piston cavity 1.2 and communicates with the piston cavity 1.2, and a piston cavity air inlet hole 1.4 is arranged on the side wall of the air valve housing 1 of the rear cavity of the piston cavity 1.2 and communicates with the piston cavity 1.2;

[0024] A piston cavity ventilation channel 3 for communication is arranged between the rear cavity of the piston cavity 1.2 and the rodless air inlet hole 1.23, and a valve core cavity ventilation channel 4 for communication is arranged between the front cavity of the valve core cavity 1.1 and the main air inlet hole 1.12;

[0025] The piston cavity ventilation channel 3 is arranged in the air valve core 2. One end of the piston cavity ventilation channel 3 communicates with the rear cavity of the piston cavity 1.2, and the other end of the piston cavity ventilation channel 3 communicates with the rodless ventilation groove 2.13.

[0026] The valve core cavity ventilation channel 4 is arranged in the air valve core 2. One end of the valve core cavity ventilation channel 4 communicates with the front cavity of the valve core cavity 1.1, and the other end of the valve core cavity ventilation channel 4 communicates with the main ventilation groove 2.12;

[0027] When the air valve core 2 moves to the forefront of the valve core cavity 1.1, the rear cavity of the piston cavity 1.2 communicates with the main air inlet hole 1.12 through the piston cavity ventilation channel 3 and the rodless ventilation groove 2.13, and the front cavity of the valve core cavity 1.1 communicates with the main air inlet hole 1.12 through the valve core cavity ventilation channel 4 and the main ventilation groove 2.12; the rodless air inlet hole 1.23 communicates with the main air inlet hole 1.12 through the rodless ventilation groove 2.13; the rod-bearing exhaust hole 1.11 communicates with the rod-bearing air inlet hole 1.21 through the rod-bearing ventilation groove 2.11; the mechanical valve ventilation hole 1.22 communicates with the main air inlet hole 1.12 through the main ventilation groove 2.12; the rodless exhaust hole 1.13 is not communicated with the rodless air inlet hole 1.23;

[0028] When the air valve core 2 moves to the rearmost end of the piston chamber 1.2, the front chamber of the valve core chamber 1.1 is communicated with the main air delivery hole 1.12 through the valve core chamber air vent passage 4 and the main air vent groove 2.12; the rodless exhaust hole 1.13 is communicated with the rodless air delivery hole 1.23 through the rodless air vent groove 2.13; the mechanical valve air vent hole 1.22 is communicated with the main air delivery hole 1.12 through the main air vent groove 2.12; the rod-type exhaust hole 1.11 is not communicated with the rod-type air delivery hole 1.21; the rear chamber of the piston chamber 1.2 is not communicated with the main air delivery hole 1.12; a convex block 2.3 is provided at the rear end of the piston 2.2.

[0029] As Figure 3 shown, the piston chamber air vent passage 3 is entirely arranged in the air valve housing 1. One end of the piston chamber air vent passage 3 is communicated with the rear chamber of the piston chamber 1.2, and the other end of the piston chamber air vent passage 4 is communicated with the rodless air delivery hole 2.13.

[0030] The valve core chamber air vent passage 4 is entirely arranged in the air valve housing 1. One end of the valve core chamber air vent passage 4 is communicated with the front chamber of the valve core chamber 1.1, and the other end of the valve core chamber air vent passage 4 is communicated with the main air delivery hole 2.12.

[0031] As Figure 4 shown, the piston chamber air vent passage 3 is partially arranged in the air valve housing 1. One end of the piston chamber air vent passage 3 is communicated with the rear chamber of the piston chamber 1.2 through the first through hole 5 of the air valve housing 1, and the other end of the piston chamber air vent passage 3 is communicated with the rodless air delivery hole 2.13 through the second through hole 6 of the air valve housing 1; the first through hole 5 and the second through hole 6 are connected by a gas pipeline 7.

[0032] The valve core chamber air vent passage 4 is partially arranged in the air valve housing. One end of the valve core chamber air vent passage 4 is communicated with the front chamber of the valve core chamber 1.1 through the third through hole 8 of the air valve housing 1, and the other end of the valve core chamber air vent passage 4 is communicated with the main air delivery hole 2.12 through the fourth through hole 9 of the air valve housing 1; the third through hole 8 and the fourth through hole 9 are connected by a gas pipeline 7.

[0033] The working principle of the present utility model is that the rod-type air delivery hole 1.21 of the present utility model is communicated with the rod-type air chamber 15 of the booster oil pump through the rod-type chamber air delivery passage 10, the rodless air delivery hole 1.23 is communicated with the rodless air chamber 16 of the booster oil pump through the rodless chamber air delivery passage 11, the mechanical valve air vent hole 1.22 is communicated with the upper mechanical valve 17 through the mechanical valve connection passage 12, the piston chamber air delivery hole 1.4 is communicated with the upper mechanical valve 17 through the piston chamber air delivery passage 13, and the upper mechanical valve 17 and the lower mechanical valve 18 are communicated through the mechanical valve connection passage 14.

[0034] As Figure 5As shown, when the air chamber piston 19 in the supercharging oil pump touches the upper mechanical valve 17 upward, the compressed gas passes through the main air inlet hole 1.12, the main ventilation groove 2.12, the mechanical valve air inlet hole 1.22, the mechanical valve connection channel 12, and the piston chamber air supply channel 13 to enter the rear chamber of the piston chamber 1.2 and push the air valve core 2 to move to the front end of the valve core chamber 1.1;

[0035] As Figure 1 shown, at this time, the rear chamber of the piston chamber 1.2 is communicated with the main air inlet hole 1.12 through the piston chamber ventilation channel 3 and the rodless ventilation groove 2.13, and the rodless air inlet hole 1.23 is communicated with the main air inlet hole 1.12 through the rodless ventilation groove 2.13; the rod air exhaust hole 1.11 is communicated with the rod air inlet hole 1.21 through the rod ventilation groove 2.11; the mechanical valve air inlet hole 1.22 is communicated with the main air inlet hole 1.12 through the main ventilation groove 2.12; the rodless air exhaust hole 1.13 is not communicated with the rodless air inlet hole 1.23; the compressed gas passes through the piston chamber ventilation channel 3 into the rear chamber of the piston chamber 1.2 and holds the air valve core 2, and at the same time, the compressed gas passes through the main air inlet hole 1.12, the rodless ventilation groove 2.13, the rodless air inlet hole 1.23, and the rodless chamber air supply channel 11 to enter the rodless air chamber 16, pushing the air chamber piston 19 to move downward, and then pushing the oil cylinder piston to move for oil replenishment; at the same time, the gas in the rod air chamber 15 is discharged through the rod chamber air supply channel 10, the rod air inlet hole 1.21, the rod ventilation groove 2.11, and the rod air exhaust hole 1.11;

[0036] As Figure 6 shown, when the air chamber piston 19 moves to the bottom and touches the lower mechanical valve 18, the gas in the rear chamber of the piston chamber 1.2 is discharged through the piston chamber air supply channel 13 and the mechanical valve connection channel 14, and the compressed gas passes through the main air inlet hole 1.12 and the valve core chamber ventilation channel 4 to enter the front chamber of the valve core chamber 1.1 and push the air valve core 2 to move to the rear end of the piston chamber 1.2;

[0037] As Figure 2 shown, at this time, the front chamber of the valve core chamber 1.1 is communicated with the main air inlet hole 1.12 through the valve core chamber ventilation channel 4 and the main ventilation groove 2.12; the rodless air exhaust hole 1.13 is communicated with the rodless air inlet hole 1.23 through the rodless ventilation groove 2.13; the mechanical valve air inlet hole 1.22 is communicated with the main air inlet hole 1.12 through the main ventilation groove 2.12; the rod air exhaust hole 1.11 is not communicated with the rod air inlet hole 1.21;

[0038] Compressed gas is input into the front cavity of the spool cavity 1.1 through the main air inlet hole 1.12, the main air vent groove 2.12, and the spool cavity air vent passage 4 and presses against the air spool 2. At the same time, compressed gas is input into the rod-end air cavity 15 through the main air inlet hole 1.12, the main air vent groove 2.12, the rod air vent groove 2.11, and the rod-end cavity air delivery passage 10 and pushes the air cavity piston 19 to move upward, thereby pushing the oil cylinder piston to move for oil replenishment. At the same time, the gas in the rodless air cavity 16 is discharged through the rodless cavity air delivery passage 11, the rodless air inlet hole 1.23, the rodless air vent groove 2.13, and the rodless exhaust hole 1.13.

Claims

1. A pneumatic control valve for a supercharging oil pump, which comprises a valve housing and a valve spool; the valve spool includes a spool body and a piston, and the piston is arranged at the rear end of the spool body; a valve spool cavity and a piston cavity which are communicated with each other are arranged in the valve housing; the spool body and the piston are arranged in the corresponding valve spool cavity and piston cavity; It is characterized in that a rod-bearing ventilation groove, a main ventilation groove and a rodless ventilation groove are sequentially arranged on the spool body from front to back; a rod-bearing exhaust hole, a main air inlet hole and a rodless exhaust hole are sequentially arranged on the side wall of the valve housing of the valve spool cavity from front to back; correspondingly, a rod-bearing air inlet hole, a mechanical valve ventilation hole and a rodless air inlet hole are sequentially arranged on the side wall of the valve housing of the valve spool cavity from front to back; a piston cavity exhaust hole communicating with the piston cavity is arranged on the side wall of the valve housing of the front cavity of the piston cavity, and a piston cavity air inlet hole communicating with the piston cavity is arranged on the side wall of the valve housing of the rear cavity of the piston cavity; a piston cavity ventilation channel for communication is arranged between the rear cavity of the piston cavity and the rodless air inlet hole, and a valve spool cavity ventilation channel for communication is arranged between the front cavity of the valve spool cavity and the main air inlet hole; When the valve spool moves to the front end of the valve spool cavity, the rear cavity of the piston cavity is communicated with the main air inlet hole through the piston cavity ventilation channel and the rodless ventilation groove, and the front cavity of the valve spool cavity is communicated with the main air inlet hole through the valve spool cavity ventilation channel and the main ventilation groove; the rodless air inlet hole is communicated with the main air inlet hole through the rodless ventilation groove; the rod-bearing exhaust hole is communicated with the rod-bearing air inlet hole through the rod-bearing ventilation groove; the mechanical valve ventilation hole is communicated with the main air inlet hole through the main ventilation groove; the rodless exhaust hole is not communicated with the rodless air inlet hole; When the valve spool moves to the rear end of the piston cavity, the front cavity of the valve spool cavity is communicated with the main air inlet hole through the valve spool cavity ventilation channel and the main ventilation groove; the rodless exhaust hole is communicated with the rodless air inlet hole through the rodless ventilation groove; the mechanical valve ventilation hole is communicated with the main air inlet hole through the main ventilation groove; the rod-bearing exhaust hole is not communicated with the rod-bearing air inlet hole, and the piston cavity is not communicated with the main air inlet hole.

2. The pneumatic control valve for a supercharging oil pump according to claim 1, characterized in that the piston cavity ventilation channel is entirely arranged in the valve spool, one end of the piston cavity ventilation channel is communicated with the rear cavity of the piston cavity, and the other end of the piston cavity ventilation channel is communicated with the rodless ventilation groove.

3. The pneumatic control valve for a supercharging oil pump according to claim 1, characterized in that the piston cavity ventilation channel is entirely arranged in the valve housing, one end of the piston cavity ventilation channel is communicated with the rear cavity of the piston cavity, and the other end of the piston cavity ventilation channel is communicated with the rodless air inlet hole.

4. The pneumatic control valve for a supercharging oil pump according to claim 1, characterized in that the piston cavity ventilation channel is partially arranged in the valve housing, one end of the piston cavity ventilation channel is communicated with the rear cavity of the piston cavity through a first through hole of the valve housing, and the other end of the piston cavity ventilation channel is communicated with the rodless air inlet hole through a second through hole of the valve housing; the first through hole and the second through hole are connected by a trachea.

5. The pneumatic control valve for a supercharging oil pump according to claim 1, wherein the air passage of the spool cavity is entirely arranged in the air spool. One end of the air passage of the spool cavity communicates with the front cavity of the spool cavity, and the other end of the air passage of the spool cavity communicates with the main air groove.

6. The pneumatic control valve for a supercharging oil pump according to claim 1, wherein the air passage of the spool cavity is entirely arranged in the valve housing. One end of the air passage of the spool cavity communicates with the front cavity of the spool cavity, and the other end of the air passage of the spool cavity communicates with the main air hole.

7. The pneumatic control valve for a supercharging oil pump according to claim 1, wherein the air passage of the spool cavity is partially arranged in the valve housing. One end of the air passage of the spool cavity communicates with the front cavity of the spool cavity through the third through hole of the valve housing, and the other end of the air passage of the spool cavity communicates with the main air hole through the fourth through hole of the valve housing; a gas pipeline is connected between the third through hole and the fourth through hole.

8. The pneumatic control valve for a supercharging oil pump according to claim 1, wherein a convex block is provided at the rear end of the piston.

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