AIR ASPIRATION SYSTEM FOR MEDIA FLOW CONTROL VALVE IN SHOT PEENING
This application describes a magnetic valve for controlling the flow of media in wheel-blast style abrasive blasting cabinets. The valve features a novel air aspiration system comprising of aspiration inlets, chamber, and outlets, in a configuration which guarantees passage of air from ambient into the peening system regardless of installation. This system acts as a passive aspiration source to counteract the negative pressures imposed by the wheel-blast blades in the valve's off-state. This arrangement eliminates the need for other means of aspiration to be installed in the peening system by the end user.
This application is a non-provisional conversion of U.S. Pat. App. No. 63/418,795 entitled “AIR ASPIRATION SYSTEM FOR MEDIA FLOW CONTROL VALVE IN SHOT PEENING,” filed Oct. 24, 2022, the contents of which are incorporated in their entirety and for all purposes.
TECHNICAL FIELDThis disclosure generally relates to shot peening, and, specifically, providing an air aspiration system for a media flow control valve in shot peening.
BACKGROUNDShot peening is a surface enhancement process that imparts a compressive residual stress into the surface of a metal component by impacting metallic, ceramic, or glass peening particles at high velocity.
Shot peening is a surface enhancement process that imparts a compressive residual stress into the surface of a metal component by impacting metallic, ceramic, or glass peening media at high velocity. Popular methods for propelling these peening media include air blast systems and wheel blast wheels. In the air blast systems, media are introduced by various methods into the path of high pressure air and accelerated through a nozzle directed at the surface to be peened.
In wheel blast style peening applications, shot peening media is fed from a hopper or media storage bin to the blades of a rotating wheel and propelled toward an impingement target. This media travels through the peening arrangement in very high volumes, in the range of 100-2000 pounds per minute.
To regulate the flow rate of media in wheel blast style peening applications, a flow control device or apparatus is used. The flow control device or apparatus, which in some examples is a valve, but in other examples may be another mechanical component to accomplish the same result while functioning in much the same way, contains a working gap through which media may pass during a peening operation. The apparatus, in some examples a valve, may have a first side or end that is connected to a media feed or media hopper, and may have a second side or end that is connected to a wheel blast style peening unit. In some examples, these devices may be magnetically-closed valves, which may use an arrangement of permanent magnets, electrical coils, and pole pieces constructed from magnetic material to control the advancement of media. When the valve is in its off-state, or a “shut” position, the permanent magnets and magnetic material create a magnetic field which impedes the flow of shot media through the valve.
Thus, when the valve is shut or in its off-state, the valve impedes the shot media fed from the hopper from flowing through the working gap of the valve, the shot media builds up between the hopper and the valve, and thus the working gap of the valve is closed off. Consequently, the movement of the fan in a wheel blast style application creates negative pressure between the feed spout of the wheel blast unit and the control valve. This pressure differential may be sufficient to induce unintended flow of media through the working gap of the flow control device or apparatus, which negatively affects the controlled conditions of the peening process. In prior art, there have been no provisions made for this negative pressure, requiring the user to install additional equipment.
Referring now to the drawings, wherein like numerals refer to the same or similar features in the various views,
As shown in
In the example pictured in
In the example shown in
In some examples the pole pieces 2 and, or alternatively the intermediate bar 3, may be made from magnetic materials either by machining, casting, or by other mechanical processes. In other examples, all the valve 100, pole pieces 2, intermediate bar 3, aspiration inlets 4, aspiration chambers 9, and aspiration outlets 5 may be made from any materials such as composite, metal alloys, and by mechanical processes such as machining, casting, and molding that are used to make such components. The valve 100 may be manufactured separately from the aspiration inlet 4, aspiration chamber 9, and aspiration outlet 5, and all the components may be fastened together mechanically. Alternatively, the valve 100, aspiration inlet 4, aspiration chamber 9, and aspiration outlet may all be made integral as part of the same component by machining, casting, molding, or otherwise creating all the features and components as a whole.
As shown in the exemplary design in
First, the air travels through the plurality of aspiration inlets 4 through the opening provided by the aspiration inlet recess 4a. The air flow then travels from the opening of the extended inlet channel 4b, through the aspiration chamber 9, to the aspiration outlet 5, but before exiting the valve 100 through the aspiration outlet 5, the air flow passes geometry configured to filter debris from the air flow, or debris collection zone 8 located within the aspiration chamber 9. When passing through the debris collection zone 8, debris that is drawn into the aspiration chamber 9 from the environment, having a similar velocity as the air flow yet being heavier than the air flow and thus having a higher inertia than the air flow, may fall into the debris collection zone 8. Through this configuration, debris may be prevented from entering the media flow, which may prevent the peening media from being compromised by debris.
The air then flows through the aspiration outlet 5 and around a media barrier 6. The media barrier 6 may prevent media from the peening flow from entering the aspiration chamber 9 and inhibiting proper air flow.
This air flow, as it exits the aspiration outlet 5, provides a passive source of air aspiration to the shot peening system, preventing unfavorable suction or negative pressure from the wheel blast fans, which would otherwise draw shot media through the working gap and affect the shot peening parameters. Additionally, the air flows across the surface of the pole piece 2, acting as a cooling air current for the engine assembly. This secondary cooling aids in increasing the operating life of the valve.
While this disclosure has described certain examples, it will be understood that the claims are not intended to be limited to these examples except as explicitly recited in the claims. On the contrary, the instant disclosure is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the disclosure. Furthermore, in the detailed description of the present disclosure, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, it will be obvious to one of ordinary skill in the art that systems and methods consistent with this disclosure may be practiced without these specific details. In other instances, well known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure various aspects of the present disclosure.
Claims
1. An apparatus for controlling a flow of media comprising:
- a housing;
- a working gap within the housing configured to regulate the flow of media into the housing and out of the housing, the working gap further defining a perimeter within the housing;
- at least one inlet on the housing substantially outside of the working gap;
- at least one aspiration chamber within the housing connected to the at least one inlet; and
- at least one outlet on the housing connected to the at least one aspiration chamber, the outlet substantially within the working gap.
2. The apparatus of claim 1, wherein the inlet further defines a recess on a surface of the housing.
3. The apparatus of claim 1, wherein the inlet further comprises an extended channel protruding into the aspiration chamber.
4. The apparatus of claim 1, wherein the aspiration chamber further defines an air filtering geometry.
5. The apparatus of claim 1, wherein the outlet further comprises a media barrier located substantially between the outlet and the working gap.
6. The apparatus of claim 1, wherein the apparatus further comprises:
- at least one pole piece located substantially on the perimeter of the working gap; and
- at least one intermediate bar located substantially within the perimeter of the working gap.
7. The apparatus of claim 6, wherein at least one of the pole piece or intermediate bar are magnetically charged.
8. The apparatus of claim 6, wherein:
- the housing further comprises: a first side configured to receive media from a media hopper; and a second side configured to mate with a connection to a media blast unit;
- the at least one pole piece and the at least one intermediate bar are substantially fixed within the working gap at a point between the first side of the housing and the second side of the housing; and
- the at least one outlet within the working gap is on the second side of the housing within the working gap.
9. An apparatus for controlling a flow of media comprising:
- a housing;
- a working gap within the housing configured to accept the flow of media into the housing and out of the housing the working gap further defining a perimeter within the housing;
- at least one inlet on the housing substantially outside of the working gap, the inlet defining a recessed portion and an extended channel;
- at least one aspiration chamber within the housing further comprising: a first end; an air filtering geometry; and a second end; wherein the first end is connected to the at least one inlet and the extended channel of the at least one inlet extends into the at least one aspiration chamber; and
- at least one outlet on the housing connected to the second end of the at least one aspiration chamber, the at least one outlet located substantially within the working gap, the at least one outlet further comprising a media barrier substantially between the outlet and the working gap.
10. The apparatus of claim 9, wherein the apparatus further comprises:
- at least one pole piece located substantially on the perimeter of the working gap; and
- at least one intermediate bar located substantially within the perimeter of the working gap.
11. The apparatus of claim 10, wherein at least one of the pole piece or intermediate bar are magnetically charged.
12. The apparatus of claim 10, wherein:
- the housing further comprises: a first side configured to receive media from a media hopper; and a second side configured to mate with a connection to a media blast unit;
- the at least one pole piece and the at least one intermediate bar are substantially fixed within the working gap at a point between the first side of the housing and the second side of the housing; and
- the at least one outlet within the working gap is on the second side of the housing within the working gap.
13. A method for reducing negative pressure inherent to media flow in shot peening comprising the steps:
- providing an apparatus configured to regulate the flow of media, the apparatus further comprising: a housing further comprising: a first side configured to receive media from a media hopper; and a second side configured to mate with a connection to a media blast unit; a working gap configured to enable the flow of media between the first side and the second side; at least one inlet on the housing located substantially outside of the working gap; at least one aspiration chamber connected to the inlet; and at least one outlet on the housing connected to the aspiration chamber, the outlet located substantially within the working gap;
- connecting the apparatus housing on the first side to the media hopper;
- connecting the apparatus housing on the second side to the media blast unit; and
- setting the apparatus to a closed position, wherein; when the apparatus is in the closed position it does not allow flow of media; and a negative pressure created by the media blast unit is relieved by air flowing through the at least one inlet, into the at least one aspiration chamber, and out from the at least one outlet towards the media blast unit, relieving the negative pressure.
Type: Application
Filed: Oct 23, 2023
Publication Date: Apr 25, 2024
Inventors: Benjamin Wilson (Mishawaka, IN), Bryan Chevrie (South Bend, IN), Jack Champaigne (Mishawaka, IN)
Application Number: 18/493,173