New type of piston pneumatic motor air distribution sealing structure

Abstract

This utility model belongs to the field of pneumatic control technology, specifically relating to a novel air distribution and sealing structure for a piston-type pneumatic motor. The structure includes a pneumatic motor and an air distribution unit; a sealing plug is embedded in the process hole of the pneumatic motor's curved block to effectively block oil mist diffusion; an oil slinger is fixed to the crankshaft end for splash lubrication; four piston rings are fitted onto the air distribution valve core of the air distribution unit to reduce the air passage clearance area; a cross-shaped connector connects the curved block and the air distribution valve core to achieve synchronous rotation. This utility model effectively solves the problem of oil mist contamination, reduces gas leakage, and significantly improves the mechanical efficiency of the motor. The overall structure is simple and highly reliable, and it is suitable for various multi-cylinder piston-type pneumatic motors.

Description

Technical Field

[0001] This utility model belongs to the field of pneumatic control technology, specifically relating to a novel piston-type pneumatic motor air distribution sealing structure. Background Technology

[0002] Piston pneumatic motors are low-speed, high-torque pneumatic power components. Due to their superior explosion-proof, starting, and overload self-protection performance, they are widely used in many aspects of social production.

[0003] Piston-type pneumatic motors are all multi-cylinder structures. Their operation is generally accomplished by a valve train that matches their structure and number of cylinders. The most basic valve train generally consists of two parts: a distribution unit and a valve distribution unit. The distribution unit is used to switch the motor's intake and exhaust to achieve its forward and reverse operation. The valve distribution unit achieves sequential and orderly supply and exhaust between each cylinder by rotating the valve core that runs through the valve train and the pneumatic motor's air passage, so as to ensure the effective and continuous operation of the pneumatic motor.

[0004] Piston-type pneumatic motors typically use splash lubrication for their internal rotating parts. During operation, oil mist forms inside the motor housing. The valve core, requiring continuous rotation, has a clearance fit with the valve distribution unit and motor housing. Therefore, high-pressure gas from the high-pressure air passage can enter the motor housing cavity through this clearance, creating a positive pressure relative to the external space. This causes the oil mist from the motor cavity to be discharged through the breather along with the positive pressure gas, resulting in pollution. Furthermore, during the negative pressure intake phase of some cylinders, oil mist from the motor cavity can also enter the motor air passage and cylinder space through the valve distribution clearance, and be discharged into the atmosphere through the exhaust port during the exhaust phase, forming a pollution source. Additionally, the clearance in the valve distribution device creates a certain degree of connection between the intake and exhaust passages, affecting the normal operation of the pneumatic motor. Utility Model Content

[0005] To solve the aforementioned technical problems, this utility model provides a novel piston-type pneumatic motor air distribution and sealing structure, which greatly reduces the connection area between various functional air passages and effectively improves the situation of the above problems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A novel piston-type pneumatic motor air distribution sealing structure includes a pneumatic motor and an air distribution unit, wherein the pneumatic motor and the air distribution unit are connected through an air passage; The pneumatic motor includes: Motor housing; The crankshaft is rotatably mounted inside the motor housing. The curved block is fixedly sleeved on the crankshaft and has process holes on it; The oil slinger is fixedly connected to the end of the crankshaft and rotates synchronously with the crankshaft. The sealant is embedded in the process hole of the curved block; The gas distribution unit includes: Valve body; The valve core is installed inside the valve body and rotates around its own axis. The cross-shaped connector has one end fixedly connected to the curved block and the other end fixedly connected to the valve core. Piston rings, the four piston rings are sleeved on the outer circumferential surface of the valve core and are tightly fitted to the inner wall of the valve body.

[0007] Furthermore, a cylinder air passage is provided on the motor housing.

[0008] Furthermore, the valve body is provided with an intake and exhaust passage and a distribution passage, the valve core is provided with an intake and exhaust passage, and the distribution passage is connected to the cylinder passage.

[0009] Furthermore, the four piston rings are spaced apart along the axial direction of the valve core.

[0010] Furthermore, the valve body and the motor housing are fixedly connected by bolts, and a sealing gasket is provided on the mating surface of the two.

[0011] Furthermore, the cross-shaped connector is connected to the curved block by a pin and to the valve core by a spline.

[0012] The beneficial effects of this utility model are as follows: The novel piston-type pneumatic motor air distribution sealing structure provided by this utility model, through the dual protection design of sealing and blocking and four piston ring sealing, blocks the diffusion of oil mist to the air distribution gap from the source and seals the gap channel of the air distribution system, effectively avoiding pollution caused by oil mist being emitted with the gas. The novel piston-type pneumatic motor gas distribution sealing structure provided by this utility model has four piston rings that significantly reduce the connection area of ​​the intake and exhaust passages, reduce the leakage of high-pressure gas, ensure stable pressure difference in the air passages, and significantly improve the output power and energy utilization efficiency of the pneumatic motor. The novel piston-type pneumatic motor air sealing structure provided by this utility model has a simple overall structure, is easy to process and assemble, and does not require additional power drive. It works in conjunction with the original operating mechanism of the motor, and has strong stability and high reliability in long-term use. Attached Figure Description

[0013] Figure 1 This is a front sectional view of the air distribution and sealing structure of the novel piston-type pneumatic motor of this utility model; In the diagram: 100, pneumatic motor; 101, oil slinger; 102, crankshaft; 103, crank block; 104, plug; 105, motor housing; 200, valve train; 201, piston ring; 202, valve core; 203, valve body; 204, cross joint. Detailed Implementation

[0014] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described in detail here, but the embodiments of the present invention are not limited to the following embodiments.

[0016] Example: A novel piston-type pneumatic motor air distribution sealing structure, with reference to the following structure. Figure 1 As shown, it includes a pneumatic motor 100 and an air distribution unit 200, which are connected through an air passage and work together to achieve the power output and continuous operation of the motor. The pneumatic motor 100 is used to convert the pressure energy of compressed air into mechanical energy, and includes: Motor housing 105: It is the overall support structure for the pneumatic motor 100, and forms a sealed space inside to accommodate lubricating oil, rotating parts and cylinder; Crankshaft 102: It is the power output shaft of the pneumatic motor 100, which can rotate around its own axis. Its two ends are respectively engaged with the motor housing 105 and the valve train 200. Curved flat block 103: It is fixedly sleeved on the crankshaft 102, rotates synchronously with the crankshaft 102, and has process holes on it; Oil slinger 101: Fixedly connected to the end of crankshaft 102, rotating synchronously with crankshaft 102, used to achieve splash lubrication; Block 104: Embedded in the process hole of the curved block 103, used to block the oil mist in the inner cavity of the pneumatic motor 100 from spreading towards the air distribution valve core 202; Cylinder intake port M: Located on the motor housing 105, one end of which is connected to the intake port of the air distribution unit 200, and the other end is connected to the cylinder of the motor. It is used to deliver compressed air to the cylinder or to discharge cylinder exhaust gas.

[0017] The valve distribution unit 200 is used to control the distribution and exhaust timing of compressed air, and its key components include: Valve body 203: It is the supporting housing of valve unit 200, and has intake and exhaust passages T1 and T2 and valve distribution passages P1 and P2 inside; wherein, intake and exhaust passages T1 and T2 are used to connect to an external compressed air source, and valve distribution passages P1 and P2 are connected to cylinder passages M. Valve core 202: It is installed inside the valve body 203 and can rotate around its own axis. It has inlet and outlet passages X1 and X2 inside. The inlet and outlet passages X1 and X2 can selectively connect the inlet and outlet passages (T1 / T2) and the valve passage (P1 / P2) of the valve body 203 as the valve core 202 rotates. Cross connector 204: One end is fixedly connected to the crank block 103, and the other end is fixedly connected to the valve core 202. It is used to transmit the rotational torque of the crankshaft 102 to the valve core 202 so that the two rotate synchronously. Piston ring 201: There are four rings in total, all of which are fitted on the outer circumferential surface of the valve core 202 and are tightly fitted to the inner wall of the valve body 203; used to reduce the gap communication cross-sectional area between the air passage of the valve body 203, the air passage of the valve core 202 and the cylinder air passage M.

[0018] The working principle of this utility model is as follows: 1. Power Drive Principle: The distribution unit of the external valve train controls the compressed air to enter the intake and exhaust ports T1 or T2 of the valve body 203, and then through the intake and exhaust ports X1 or X2 of the valve core 202 to the distribution port P1 or P2 of the valve body 203, and then into the cylinder port M of the pneumatic motor 100, pushing the piston (not shown in the figure) in the downward position to move. The piston drives the connecting rod (not shown in the figure) to drive the crankshaft 102 to rotate around the axis, realizing power output. When the crankshaft 102 rotates, it drives the crank block 103 fixed on it to rotate synchronously. The crank block 103 drives the valve core 202 to rotate through the cross joint 204. The rotation of the valve core 202 switches the connection relationship between the intake and exhaust ports X1 and X2 and the distribution ports P1 and P2, realizing the switching of the intake and exhaust phase between different cylinder ports M of the pneumatic motor 100, and achieving continuous operation of the motor.

[0019] 2. Sealing and Protection Principle: The oil slinger 101, fixedly connected to the end of the crankshaft 102, rotates with the crankshaft 102, slinging up the lubricating oil at the bottom of the motor housing 105, forming an oil mist on the inner wall of the motor housing 105, providing lubrication for internal rotating parts (such as the crankshaft 102 and bearings, piston and cylinder wall); simultaneously, the seal 104, embedded in the process hole of the crankshaft block 103, prevents the lubricating oil mist in the inner cavity of the pneumatic motor 100 from reaching the vicinity of the valve core 202 and being discharged outside the machine through the air passage negative pressure via the fit clearance, avoiding adverse effects; in the valve core 20 The four piston rings 201 on the valve body 203 fit tightly against the inner wall of the valve body 203, greatly reducing the cross-sectional area of ​​the gap between the intake and exhaust passages (T1 / T2, P1 / P2) of the valve body 203, the intake and exhaust passages (X1 / X2) of the valve core 202, and the cylinder passage M of the pneumatic motor 100. On the one hand, this effectively prevents a small amount of oil mist that is not blocked by the seal 104 from entering the passage through the gap, thus completely solving the problem of oil mist emission pollution. On the other hand, it reduces the high-pressure gas leakage caused by the gap connection of the intake and exhaust passages, avoids the decrease of the pressure difference in the passage, and improves the mechanical efficiency of the pneumatic motor.

[0020] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A novel piston-type pneumatic motor air distribution sealing structure, comprising a pneumatic motor and an air distribution unit, characterized in that, The pneumatic motor and the air distribution unit are connected through an air passage; The pneumatic motor includes: Motor housing; The crankshaft is rotatably mounted inside the motor housing. The curved block is fixedly sleeved on the crankshaft and has process holes on it; The oil slinger is fixedly connected to the end of the crankshaft and rotates synchronously with the crankshaft. The sealant is embedded in the process hole of the curved block; The gas distribution unit includes: Valve body; The valve core is installed inside the valve body and rotates around its own axis. The cross-shaped connector has one end fixedly connected to the curved block and the other end fixedly connected to the valve core. Piston rings, the four piston rings are sleeved on the outer circumferential surface of the valve core and are tightly fitted to the inner wall of the valve body.

2. The novel piston-type pneumatic motor air distribution sealing structure according to claim 1, characterized in that, The motor housing has a cylinder air passage.

3. The novel piston-type pneumatic motor air distribution sealing structure according to claim 1, characterized in that, The valve body is provided with an intake and exhaust passage and a distribution passage, and the valve core is provided with an intake and exhaust passage. The distribution passage is connected to the cylinder passage.

4. The novel piston-type pneumatic motor air distribution sealing structure according to claim 1, characterized in that, The four piston rings are spaced apart along the axial direction of the valve core.

5. The novel piston-type pneumatic motor air distribution sealing structure according to claim 1, characterized in that, The valve body and the motor housing are fixedly connected by bolts, and a sealing gasket is provided on the mating surface of the two.

6. The novel piston-type pneumatic motor air distribution sealing structure according to claim 1, characterized in that, The cross-shaped connector is connected to the curved block by a pin and to the valve core by a spline.

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