MX2008001387A - Reciprocating piston pump with air valve, detent and poppets - Google Patents

Abstract

An air valving system for a reciprocating piston pump (5) which uses piston (10) actuated poppet assemblies (40) to control the main air valve (16) shift. The valve exhaust is vented (50) directly to atmosphere rather than through the main exhaust to ensure reliability. A ramped detent (32) prevents the air valve (16) from centering.

Description

ALTERNATIVE PISTON PUMP WITH AIR VALVE, RETENTION AND DISC VALVES WITH VERTICAL MOVEMENT TECHNICAL FIELD This application claims the benefit of US applications serial numbers 60 / 704,046, filed July 29, 2005 and 60 / 747,604 filed e | May 18, 2006 PREVIOUS TECHNIQUE The alternative piston pumps operated with air are well known for pumping various fluids. Such pumps typically have air valves mechanically or pneumatically operated to control the flow of air to both sides of the piston.

BRIEF DESCRIPTION OF THE INVENTION It is therefore an object of this invention to provide a system that allows for improved control of an alternative air motor by minimizing the changeover time and reducing the tendency of the valve to freeze.

The present invention shortens the exhaust ports in the air valve to minimize the effects of icing. These embodiments allow the exhaust to flow straight through the valve eliminating the lifting of the bushing associated with traditional bushing designs in which the exhaust air has to rotate. The valves are independent of the supply pressure due to opposing valve plates. The air valve is constructed of two opposed stationary valve plates and a movable through-hole placed between the plates. The bushing or through bushes have separate exhaust and supply ports that function like a four-way valve. The bushing is constructed of two spring-loaded coupling bushings with a sealed exhaust port that passes straight through the assembly. In one embodiment, there are double through-bushings with one supply port and one exhaust port. This configuration requires a cylinder port A and. B, two exhaust ports (one for each bushing) and a sealed valve housing which supplies pressurized air. The advantage of this configuration is that the separate valve mechanisms can be located at the ends of the cylinder to minimize the length of the port. In another embodiment, an individual through bushing only has one exhaust port. This configuration requires a cylinder port A and B, an exhaust port and a sealed valve housing which supplies pressurized air. With this method, only one through-hole is required. Even in another embodiment, an individual bushing is provided with a central supply port and two exhaust ports. This allows a logical pilot scheme with leaking inverted pilot ports. The valve of the engine includes two assemblies of disc valves with vertical movement one being located in the upper cover and the other in the lower cover. The vertically moving disc valve assembly includes a t-shaped sealing material that is sealed on both sides. Throughout most of the motor stroke, side A of the vertical-movement disk valve assembly is sealed preventing air escape from the valve piston. As the motor reaches the end of its stroke, the motor piston opens the A side of the disc with vertical movement while sealing the B side. When the disc is opened with vertical movement, it ventilates one side of the piston valve , changing the valve. Sealing the disc with vertical movement on the B side ensures that the depressurized side of the valve piston does not have a supply of replenishing air, thereby maximizing the velocity of the valve. After the change of the motor, the disc with vertical movement is restored to its normal position. Rapid change and valve speed translate into reduced pressure output from the pump and increased efficiency and performance.

This and other objects and advantages of the invention will appear more fully from the following description made together with the accompanying drawings, wherein the similar reference characters refer to the same or similar parts throughout the various views.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a cross section of the air valve of the present invention; Figures 2A-2C show a cross section (opposite to that of Figure 1) of the air valve of the present invention; Figures 3A-3B show a schematic view of the air valve of the present invention; Figure 4 shows a cross section of the disc valve with vertical movement in the closed position; Figure 5 shows a cross-section of the disc valve with vertical movement in the open position; Figure 6 shows a schematic diagram of the air flow through the air valve and disks with vertical movement while the piston moves upwards; Figure 7 shows a schematic diagram of the air flow through the air valve and discs with vertical movement while the piston is changing at the upper limit of displacement; Figure 8 shows a schematic diagram of the air flow through the air valve and discs with vertical movement after the valve has changed; Figure 9 shows a schematic diagram of the air flow through the air valve and disks with vertical movement while the piston moves downwards. Figure 10 shows a cross-section of the toothed-air valve of the present invention; Figure 11 shows a detailed cross-section of the toothed-air valve of the present invention; and Figure 12 shows the assembly of the air valve and the solenoid of the present invention.

DETAILED DESCRIPTION OF THE INVENTION The air valve may be constructed of two opposed stationary valve plates and a movable through-bushing placed between the plates. The bushing or through bushes have separate exhaust and supply ports that function like a four-way valve. The bushing is constructed of two spring-loaded coupling bushings with a sealed exhaust port that passes straight through the assembly.

In the preferred embodiment, an individual through bushing only has one exhaust port. This configuration requires a cylinder port A and B, an exhaust port and a sealed valve housing which supplies pressurized air. With this method, only one through-hole is required. In one embodiment, there are double through-racks with a supply port and an exhaust port. This configuration requires a cylinder port A and B, two exhaust ports (one for each bushing) and a sealed valve housing which supplies pressurized air. The advantage of this configuration is that the separate valve mechanisms can be located at the ends of the cylinder to minimize the length of the port. Even in another embodiment, an individual bushing is provided with a central supply port and two exhaust ports. This allows a logical pilot scheme with leaking inverted pilot ports. The valve of the engine includes two assemblies of disc valves with vertical movement 40 one being located in the upper cover and the other in the lower cover. The vertical valve disc valve assembly 40 performs two functions. First, it will supply air to the pistons 47 and 48 of the valve and secondly, it will ventilate the air pressure in the valve areas 47 and 48. While in the normal or closed position, the vertically-moving disk valve assembly 40 allows the supply pressurized air to pass through the upper holes 41a in the disk housing 41 with vertical movement through the holes 43a in the vertical movement disc 43, through the lower holes 41 b in the housing 41 towards the area 47 or 48 of the valve piston. The air pressure plus the force of the spring 42 keeps the vertical movement disc 43 in the closed position sealed in the seat 44. The piston 0 of the motor pushes the disc actuator 45 with vertical movement compressing the spring 46 until the pressure of the spring 46 exceeds the combined retention pressure of the air supply and spring 42 whereby the vertical movement disc 43 disengages from seat 44. The air pressure retention force drops rapidly, allowing the disc with vertical movement 43 to open under pressure. When the disc with vertical movement 43 is opened, it ventilates one of the valve piston areas (47, 48) through the ports 41b, the grooves 45a in the actuator 45 and outlet ports 44a to step 50 and short the supply air to that area of the piston allowing the valve 20 to change. The ventilated air is routed to the atmosphere independently through the passage 50 from the valve exhaust, thus ensuring that the entire valve 20 will change even if the valve exhaust is restricted. This is important to prevent the pump from hanging. Throughout most of the motor stroke, side A of the vertical-movement disk valve assembly is sealed preventing air escape from the valve piston. As the motor reaches the end of its stroke, the motor piston opens the A side of the disc with vertical movement while sealing the B side. When the disc is opened with vertical movement, it ventilates one side of the piston valve , changing the valve. Sealing the disc with vertical movement on the B side ensures that the depressurized side of the valve piston does not have a supply of replenishing air, thereby maximizing the velocity of the valve. After the change of the motor, the disc with vertical movement is restored to its normal position. Rapid change and valve speed translate into reduced pressure output from the pump and increased efficiency and performance. Simply put as shown in Figures 6-9, the piston 19 of the valve is always located at the same end as the main piston 10 moves. Thus, in Figure 6, the main piston 10 it moves upwards and the piston 20 of the valve is located at the upper end of the valve housing 14. Similarly, in figure 9, the main piston 10 moves down and the piston 20 of the valve is located at the lower end of the valve housing 14. It is also useful to visualize the operation, is that the disc assembly 40 with upper vertical movement communicates with the piston area 48 of the lower valve while the disc assembly 40 with lower vertical movement it communicates with the piston area 47 of the upper valve. The main air valve 16 has a piston 20 which is provided with an exhaust bushing 22 which alternatively communicates with the upper part 24 and lower part 26 of the piston 10. The inner area 28 of the valve housing 14 of air is provided with a source of pressurized air. The piston 16 of the valve moves and alternately uncovers the ports 30 and 32 which lead to the upper part 24 and lower part 26 of the piston 10, respectively. A retainer is provided in the main air valve 16 and is formed by a roller assembly 31, a spring 34 and a ramp 33 mounted on the back of the valve socket 22. The roller assembly 31 allows the ramp 33 and the valve cap assembly 22 to move approximately .381 centimeters before nesting against the lip 33a of the ramp. The geometry of the roller assembly 31 and ramp 33 then keeps the valve 16 in position until the air signal of the vertical moving disk assemblies 40 is sufficient to completely move the valve bushing 22. Due to the radii of the ramp and the pointed flange 33a, the valve assembly 16 is unstable in the flange 33a. This prevents the valve assembly from stopping in a centered position and could choke the engine. It also prevents the valve assembly 16 from centering during transit, which could cause starting problems. Another function of the retainer is to ensure that the valve stem assembly 22 moves the solenoid 35 which extends to lock the valve assembly 16 after a runaway condition has occurred. Solenoid 35 works with battery and has a low retraction force. When it is energized, the valve assembly 16 is allowed to move .558 centimeters before coming into contact with the solenoid 35. The solenoid 35 then prevents the valve assembly 16 from moving further thereby stopping the engine. It is contemplated that various changes and modifications may be made to the valve and disks with vertical movement without departing from the spirit and scope of the invention as defined by the following claims.

Claims (4)

NOVELTY OF THE INVENTION CLAIMS

1. - An alternative piston pump operated with air for use with a source of compressed air having a cylinder with first and second ends, a piston in said cylinder and a main air valve having first and second ends and further comprising: and second disks with vertical movement located in said first and second ends of the cylinder for contact through said piston at the end of its stroke, said disks with vertical movement are diverted to a closed position by means of a spring and air pressure and they operate through said piston in a second position whereby in said closed position, said source of compressed air is connected to one of said ends of the main valve and in said second position ventilates said one end of the valve directly to the atmosphere .

2. - The alternative piston pump operated with air according to claim 1, further characterized in that it further comprises a ramp retainer that pushes said main air valve to any of said ends.

3. - A disk assembly with vertical movement comprising: a disk housing with vertical movement having an axis and first and second sets of accommodation ports, said first and second sets of accommodation ports are axially spaced; a disc seat with vertical movement in said housing, said seat has a set of seating ports; a disc with vertical movement located in said disc housing with vertical movement and retained therein through said seat, said disc with vertical movement has a set of disc ports with vertical movement and deflected against said seat in a first position and which can be moved to a second position away from said seat; a disk drive with vertical movement located in said seat and partially surrounding said discs with vertical movement, said disk drive with vertical movement is deviated away from said disk with vertical movement, whereby, when said disk with vertical movement is in said first position, said first set of accommodating ports are in fluid communication with said second set of accommodating ports through said disc ports with vertical movement and when in said second position, the first set of accommodating ports are in fluid communication with said seating ports.

4. An alternative piston pump operated with air for use with a source of compressed air having a cylinder with first and second ends, a piston in said cylinder and a main air valve having first and second ends and further comprising; first and second disc assemblies with vertical movement located in said first and second ends of the cylinder for contact through said piston at the end of its stroke, said discs with vertical movement are diverted to a closed position by means of a spring and pressure of air and operate through said piston in a second position, said disc assemblies with vertical movement comprise: a disk housing with vertical movement having an axis and first and second sets of accommodation ports, said first and second sets of accommodation ports are axially spaced; a disc seat with vertical movement in said housing, said seat has a set of seating ports; a disc with vertical movement located in said disc housing with vertical movement and retained therein through said seat, said disc with vertical movement has a set of disc ports with vertical movement and deflected against said seat in a first position and which can be moved to a second position away from said seat; a disk drive with vertical movement located in said seat and partially surrounding said discs with vertical movement, said disk drive with vertical movement is deviated away from said disk with vertical movement, whereby, when said disk with vertical movement is in said first position, said first set of accommodating ports are in fluid communication with said second set of accommodating ports through said disc ports with vertical movement and when in said second position, the first set of accommodating ports are in fluid communication with said seating ports, whereby in said closed position, said source of compressed air is connected to one of said ends of the main valve and in said second position ventilates said one end of the valve directly to the atmosphere .