CN110753602A - Sand blasting system - Google Patents
Sand blasting system Download PDFInfo
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- CN110753602A CN110753602A CN201880040130.4A CN201880040130A CN110753602A CN 110753602 A CN110753602 A CN 110753602A CN 201880040130 A CN201880040130 A CN 201880040130A CN 110753602 A CN110753602 A CN 110753602A
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- Prior art keywords
- control
- injection
- air
- line
- pressure tank
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- 238000005488 sandblasting Methods 0.000 title description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 210
- 239000002002 slurry Substances 0.000 abstract description 85
- 238000010793 Steam injection (oil industry) Methods 0.000 abstract description 25
- 238000005086 pumping Methods 0.000 abstract description 8
- 238000011144 upstream manufacturing Methods 0.000 abstract description 8
- 238000002347 injection Methods 0.000 description 235
- 239000007924 injection Substances 0.000 description 235
- 239000007921 spray Substances 0.000 description 48
- 230000001276 controlling effect Effects 0.000 description 16
- 238000005422 blasting Methods 0.000 description 10
- 238000009825 accumulation Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 241000758789 Juglans Species 0.000 description 2
- 235000009496 Juglans regia Nutrition 0.000 description 2
- 239000002223 garnet Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 235000020234 walnut Nutrition 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0007—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier
- B24C7/0015—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier with control of feed parameters, e.g. feed rate of abrasive material or carrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0007—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier
- B24C7/0038—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier the blasting medium being a gaseous stream
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0084—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a mixture of liquid and gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0007—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier
- B24C7/003—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier with means for preventing clogging of the equipment
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nozzles (AREA)
Abstract
The steam injection system includes: a compressor for generating compressed air; a water pump for pumping water flow to the pressure vessel to pressurize the pressure vessel. The control valve is disposed upstream of the pressure vessel and is configured to control the flow of water from the water pump to the pressure vessel, thereby controlling the flow of injected slurry out of the pressure vessel downstream.
Description
Cross Reference to Related Applications
This application claims priority from U.S. provisional application No.62/519,235 entitled "ABRASIVE BLAST SYSTEM" filed on 2017, 6, month 14, the disclosure of which is incorporated herein in its entirety.
Technical Field
The present disclosure relates generally to blasting systems. More particularly, the present disclosure relates to a blasting system that eliminates an on/off flow control valve downstream of a pressure tank.
Background
Blasting systems in the surface treatment industry typically use dry, wet, slurry, steam abrasive or ultra-high pressure water spray techniques to remove dirt, paint or rust from a substrate. Steam injection systems use a mixture of air, water, and a grinding medium (e.g., garnet or walnut shells) to provide the desired surface treatment. Steam injection systems typically include a pump and a pressure tank containing grinding media having a density greater than water. Pumping water to the pressure tank pressurizes the pressure tank and allows the grinding media and water to mix. The mixture of pressurized medium and water is then injected vertically into a conduit for a high flow air stream to mix the two streams before the mixture is discharged from the hose and nozzle. The flow of medium and water into the compressed air stream is typically controlled by a valve located downstream of the pressure tank. The valve is in direct contact with the mixture of medium and water and is therefore subject to wear. Therefore, the valve requires frequent maintenance and/or replacement.
Disclosure of Invention
According to one aspect of the present disclosure, a blasting system includes: a water pump; a pressure tank; an air supply line extending from an air source; a media line extending from the pressure tank to the air supply line; an injection line extending downstream from a junction of the media line and the air supply line to the nozzle; a control valve; and an injection control switch. The water pump is configured to pump a flow of water from the water line to the pressure tank. The control valve is configured to switch between an open state and a closed state to control the flow of water to the pressure tank and thereby control the flow of injected slurry from the pressure tank to the media line. The injection control switch is controllable between an activated state and a deactivated state and is configured to actuate the control valve between an open state and a closed state.
According to another aspect of the disclosure, a method comprises: generating a compressed air stream and directing the compressed air stream to an air supply line; pumping a pressurized stream of water with a water pump; and controlling actuation of the control valve between an open state and a closed state with the spray control switch to control the flow of pressurized water to the pressure tank and the flow of sprayed slurry through the media line. The air supply line extends to a junction with a media line extending from the pressure tank. The media line is configured to convey the jet slurry stream from the pressure tank to the junction. The water pump is configured to pump pressurized water flow to the pressure tank through a water line extending between the water pump and the pressure tank.
According to yet another aspect of the present disclosure, a control system for a vapor injection system, the control system having: a pressure tank storing a supply of injected slurry; a compressor for providing a flow of compressed air through an air supply line to an injection line; and a water pump for pumping water into the pressure tank to pressurize the pressure tank and expel the spray slurry downstream from the pressure tank. The spray slurry is displaced through the media line to the spray line where it is entrained in the compressed air and carried out of the nozzle. The control system includes a control valve, a jet air controller, and a jet control switch. The control valve is configured to switch between an open state and a closed state to control a flow of water from the water pump to the pressure tank. The control valve is configured to prevent water from flowing to and pressurizing the pressure tank when in a closed state, and configured to allow water to flow to and pressurize the pressure tank when in an open state. The injection air controller is disposed on the air supply line upstream of the injection line. The injection air controller is configured to switch between a controller open state and a controller closed state to control the flow of compressed air to the injection line. The injection air controller is further configured to prevent compressed air from flowing to the injection line when in the controller closed state and to allow compressed air to flow to the injection line when in the controller open state. The injection control switch actuates the control valve between an open state and a closed state and actuates the injection air controller between a controller open state and a controller closed state. The flow of the sprayed slurry out of the pressure tank is activated and deactivated by the flow of water to the pressure tank.
Drawings
FIG. 1 is a block diagram of a steam injection system;
FIG. 2 is a schematic diagram of a steam injection system having a control valve configured to control the flow of water to a pressure tank;
FIG. 3 is a schematic diagram of a steam injection system having a control valve configured to control the flow of air to a water pump; and
FIG. 4 is a schematic diagram of a steam injection system having a control valve configured to control a water pump.
Detailed Description
Fig. 1 is a simplified schematic diagram of a steam injection system 10, the steam injection system 10 being a system that entrains a sprayed slurry of water and an injection medium (e.g., garnet, walnut shell, or any other suitable injection medium) in a compressed air stream to perform coating removal and surface treatment. The vapor injection system 10 includes a compressor 12, an injection air controller 14, a water source 16, a water pump 18, a pressure tank 20, control valves 22a-22c, an injection control switch 24, a nozzle 26, control logic 28, a communication line 29, an air supply line 30, a system line 32, a water inlet line 34, a pressurization line 36, a media line 38, an injection line 40, and a junction 42.
The compressor 12 is an air compressor that generates a flow of compressed air to entrain the injected slurry and power the various components of the steam injection system 10. The compressor 12 is configured to generate a flow of compressed air each time the vapor injection system 10 is operated. An air supply line 30 extends from compressor 12 to junction 42. The junction 42 is where the media line 38 and the air supply line 30 join to form the jet line 40. An injection line 40 extends from a junction 42 of the air supply line 30 and the media line 38 to the nozzle 26. The nozzle 26 sprays a spray of entrained spray slurry for application to a surface.
A system line 32 branches from the air supply line 30 upstream of the jet air controller 14 and extends to the water pump 18. Compressed air from the compressor 12 flows into the air supply line 30. The injected portion of the compressed air ("injection air") flows downstream through an air supply line 30 to the nozzle 26, while the system portion of the compressed air ("system air") flows into a system line 32. The system line 32 provides system air to the water pump 18, and the system air powers the water pump 18. The water pump 18 includes a directional valve that directs system air to power the reciprocating motion of the piston of the water pump 18. Although the water pump 18 is described as a pneumatic pump, it should be understood that the water pump 18 may have any desired configuration, such as an electric or hydraulic pump.
The jet air controller 14 is provided on the air supply line 30, and is controllable between an open state in which the jet air controller 14 allows the jet portion to flow downstream to the junction 42, and a closed state in which the jet air controller 14 prevents the compressed air from flowing downstream to the junction 42. The jet air controller 14 is thus configured to control the jet by controlling the flow to the nozzle 26.
A water inlet line 34 extends from the water source 16 to the water pump 18. A pressurized line 36 extends from the water pump 18 to the pressure tank 20 and supplies pumped water to the pressure tank 20. The water source 16 stores a supply of water, wherein the water pump 18 pumps the supply of water to the pressure tank 20 through a pressurized line 36. The pumped water pressurizes the pressure tank 20 and produces a spray slurry.
A media line 38 extends from the pressure tank 20 to a junction 42. The media line 38 carries the sprayed slurry from the pressure tank 20 to a junction 42 where the sprayed slurry is entrained in the sprayed air from the air supply line 30 at the junction 42. The entrained ejected slurry is driven out of the nozzle 26 by the ejection air. The junction 42 is located at a height above the maximum filling level of the pressure tank 20 to prevent the spray medium from being fed to the spray line 40 through the medium line 38 under the influence of gravity.
The control valves 22a-22c are configured to control the flow of water pumped to the pressure tank 20, thereby controlling the flow of injected slurry out of the pressure tank 20. The control valve 22a is provided on the pressurization line 36 between the water pump 18 and the pressure tank 20. The control valve 22b is disposed on the system line 32 upstream of the water pump 18. The control valve 22c is provided on the water pump 18. The control valve 22c interfaces directly with the water pump 18 and mechanically controls pumping by the water pump 18.
The control valves 22a-22c are controllable between an open state, in which the control valves 22a-22c allow the pumped water to flow to the pressure tank 20, and a closed state, in which the control valves 22a-22c prevent the pumped water from flowing to the pressure tank 20. The control valves 22a-22c are arranged upstream of the pressure tank 20 such that the control valves 22a-22c are not in direct contact with the injection medium or the injected slurry. Although vapor injection system 10 is shown as including control valve 22a, control valve 22b, and control valve 22c, it should be understood that vapor injection system 10 need only include one of control valve 22a, control valve 22b, and control valve 22c to control the flow of pumped water to pressure tank 20.
The control valves 22a-22c have any suitable configuration for controlling the flow of pumped water to the pressure tank 20. The control valve 22a is a water valve on the pressurized line 36 that controls the flow of pumped water to the pressure tank 20. Likewise, the control valve 22a directly controls the flow of additional water to the pressure tank 20. The control valve 22b is an air valve on the system line 32 that controls the flow of system air to the water pump 18. The control valve 22b controls the flow of water to the pressure tank 20 by controlling the activation of the water pump 18. The control valve 22c is mechanically interfaced with the water pump 18 to control the flow of water to the pressure tank 20. In some examples, the control valve 22c is a mechanical device configured to limit the reciprocating motion of a shuttle device of a directional valve that directs system air within the water pump 18 to power the water pump 18. For example, the control valve 22c may comprise a pin, with the control valve 22c extending and retracting to inhibit and allow reciprocation of the shuttle device.
In one example, injection control switch 24 is a pneumatic switch, while injection air controller 14 and control valves 22a-22c are pneumatically actuated. In such an example, system line 32 may extend to both injection air controller 14 and control valves 22a-22c to provide compressed air to injection air controller 14 and control valves 22a-22c to actuate injection air controller 14 and control valves 22a-22c between respective states of actuating injection air controller 14 and control valves 22a-22 c. Injection control switch 24 directs the flow of compressed air to both injection air controller 14 and control valves 22a-22c to control the respective states of injection air controller 14 and control valves 22a-22 c.
In another example, injection air controller 14 is in electronic communication with both injection air controller 14 and control valves 22a-22c via a wired or wireless communication link, such as communication line 29. Injection air controller 14 provides an activation signal to injection air controller 14 and control valves 22a-22c to cause injection air controller 14 and control valves 22a-22c to switch to their respective open states. Injection air controller 14 provides a deactivation signal to injection air controller 14 and control valves 22a-22c to cause injection air controller 14 and control valves 22a-22c to switch to their respective closed states.
Control logic 28 communicates with injection control switch 24, injection air controller 14, and control valves 22a-22c via communication lines 29. Control logic 28 is configured to implement a delay in actuation between injection air controller 14 and control valves 22a-22 c. Control logic 28 may have any suitable configuration for implementing the delay between injection air controller 14 and the actuation of control valves 22a-22 c. For example, the control logic 28 may include any one or more of a microprocessor, controller, Digital Signal Processor (DSP), Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA), or other equivalent discrete or integrated logic circuitry. In some examples, the control logic 28 is an air logic controller such that compressed air from the compressor 12 is the control medium. In each example, control logic 28 is configured to cause injection air controller 14 to switch to the open state before control valves 22a-22c switch to the open state, and to cause injection air controller 14 to switch to the closed state after control valves 22a-22c switch to the closed state. In this way, the control logic 28 ensures that the injection air flows through the injection line 40 whenever the control valves 22a-22c are in an open state, thereby ensuring that the injection slurry flowing from the media line 38 is entrained and carried out of the nozzle 26.
During operation, a user controls the flow of entrained spray slurry out of the nozzle 26 via the spray control switch 24. Injection air controller 14 and control valve 22 are configured in a similar state. In this way, when injection is desired, both the injection air controller 14 and the control valve are in an open state, and when injection is not desired, both the injection air controller 14 and the control valve 22 are in a closed state.
When injection is desired, injection control switch 24 switches both injection air controller 14 and control valves 22a-22c to an open state. With the jet air controller 14 in the open state, jet air flows through the air supply line 30 to the junction 42, downstream through the jet line 40 and out of the nozzle 26. With the control valves 22a-22c in an open state, water pumped from the water pump 18 flows through the pressurization line 36 and into the pressure tank 20. The pumped water raises the pressure in the pressure tank 20 and the increased pressure expels the spray slurry from the pressure tank through the media line 38. The injected slurry flows through media line 38 to junction 42 where it is entrained in the injection air and ejected from nozzle 26 at junction 42.
The control valves 22a-22c control the flow of pumped water to the pressure tank 20 in different ways. As described above, the control valve 22a is a water valve configured to directly control the flow of water through the pressurized line 36. With the control valve 22a in the closed state, the water pumped from the water pump 18 is sealed (dead head) at the control valve 22 a. With the control valve 22a in the open state, the pumped water flows downstream into the pressure tank 20. The control valve 22b is an air valve configured to control system air flow to the water pump 18. With the control valve 22b in the closed state, system air cannot flow to the water pump 18 to power the water pump 18, and therefore the water pump 18 does not generate a pressurized water flow. With the control valve 22b in the open state, system air flows to the water pump 18 and powers the water pump 18, and the water pump 18 pumps pressurized water to the pressure tank 20. The control valve 22c is a mechanical device that interacts with the water pump 18 to control the activation of the water pump 18. With the control valve 22c in the closed state, the control valve 22c physically dampens the oscillations of the shuttle of the water pump 18, thereby preventing the shuttle from directing the system air that powers the water pump 18 so that the water pump 18 does not generate a pressurized water flow. With the control valve 22c in the open state, the shuttle device may oscillate and direct system air such that the water pump 18 pumps pressurized water to the water pump 18.
In some examples, injection air controller 14 switches to the open state before control valves 22a-22c switch to the open state. For example, injection control switch 24 may be configured to implement a delay between sending an open command to injection air controller 14 and sending an open command to control valves 22a-22 c. The control logic 28 may also implement the delay. Actuating the injection air controller 14 to the open state before actuating the control valves 22a-22c to the open state ensures that injection air has flowed through the junction 42 and the injection line 40 before the injected slurry first reaches the junction 42. Thus, a uniform flow of entrained sprayed slurry is created at the start of the spraying operation.
The user stops the flow of entrained spray slurry by placing the spray control switch 24 in an inactive state. For example, the user may release the trigger of the spray control switch 24. In the deactivated state, injection control switch 24 causes both injection air controller 14 and control valves 22a-22c to switch to their respective closed states. With the injection air controller 14 in the closed state, the injection air may be prevented from flowing to the injection line 40. With the control valve 22 in the closed state, the pumped water is prevented from flowing to the pressure tank 20 and pressurizing the pressure tank 20. Preventing pumped water from flowing to the pressure tank 20 causes the pressure in the pressure tank 20 to decrease as the spray slurry flows out of the pressure tank 20 through the media line 38. The pressure drops to a level low enough that slurry cannot be expelled through the media line 38 to the junction 42 by the pressure level in the pressure tank 20 by the spray. Thus, shutting off the flow of pressurized water to the pressure tank 20 also shuts off the flow of injected slurry out of the pressure tank 20.
After the control valves 22a-22c are switched to the closed state, the injection air controller 14 is switched to the closed state. For example, injection control switch 24 may be configured to implement a delay between sending a close command to injection air controller 14 and sending a close command to control valves 22a-22 c. The control logic 28 may also implement the delay. Switching the injection air controller 14 to the closed state after switching the control valves 22a-22c to the closed state ensures that the injection air continues to flow through the junction 42 and the injection line 40 when the pressure drops in the pressure tank 20. The injection air carries any excess flow from the pressure tank 20 out of the nozzle 26, thereby preventing the formation of an undesirable blockage of the injected slurry in the injection line 40 when the injection control switch 24 is placed in an inactive state.
The control valves 22a-22c stop the flow of the injected slurry out of the pressure tank 20 without directly interacting with the injected slurry or the injection medium. Instead, the control valves 22a-22c interact with the pressurized water flow, with the system air flow to the water pump 18, or mechanically with the water pump 18. Controlling the flow of the injected slurry by controlling the flow of pumped water to the pressure tank 20 may prevent the control valves 22a-22c from suffering wear caused by direct interaction with the injected slurry. The vapor injection system 10 does not require any valves in the direct flow of the injection medium on either the medium line 38 or the injection line 40. Instead, the jet medium flow is fully controlled by controlling the flow of water to the pressure tank 20. Eliminating valves in the flow path of the injection medium reduces maintenance requirements on the steam injection system 10, thereby reducing maintenance costs and downtime. In addition, positioning the junction 42 at a height above the maximum fill level of the pressure tank 20 may prevent any undesirable flow of injected slurry out of the media line 38 to the junction 42 when the injection air flow is stopped.
The control logic 28 also increases efficiency and provides increased injection mass. The control logic 28 ensures that the injection air starts to flow to the injection line 40 before the injection slurry flows to the injection line 40 and ensures that the injection air continues to flow to the injection line 40 after the injection slurry stops flowing to the injection line 40. Delaying the flow of injected slurry to the injection line 40 until after the injection air flows to the injection line 40 ensures that the entrained injected slurry is injected uniformly and with high quality at the nozzle 26 at the start of the injection. Delaying the stopping of the flow of the injection air to the injection line 40 until after the injection slurry stops flowing to the injection line 40 prevents an undesired accumulation of the injection medium in the injection line 40, which may result in an accumulation of the injection slurry in the injection line 40, which may hamper the flow of material and air and may result in an undesired spray quality when the injection is restarted.
Fig. 2 is a schematic diagram of a vapor injection system 100 including a compressor 12, an injection air controller 14, a water source 16, a water pump 18, a pressure tank 20, an injection control switch 24, a nozzle 26, an air supply line 30, a system line 32, a water inlet line 34, a pressurization line 36, a media line 38, an injection line 40, a junction 42, a disconnect 44, a system valve 46, a pump pressure regulator 48, a flow valve 50, a check valve 52, an air filter 54, a pressure gauge 56, a pressure relief valve 58, a system control line 60a, a system control line 60b, a pump control line 62, an injection control line 64, a pressure control line 66, and a control valve 122. The jet air controller 14 includes an air pressure regulator 68 and a jet air regulator 70.
The compressor 12 is an air compressor configured to generate a compressed air stream and provide the compressed air stream to the air supply line 30. The compressed air is divided while flowing through the air supply line 30. The water pump 18 is configured to draw water from the water source 16 and pump the water downstream to the pressure tank 20 to pressurize the pressure tank 20. The pressure tank 20 stores a blasting slurry composed of water and blasting media. The pressure within the pressure tank 20 causes the spray slurry to flow downstream from the pressure tank 20 through the media line 38 and to the spray line 40 where the spray slurry is entrained in the spray air flowing through the air supply line 30. The entrained spray slurry is delivered downstream to the nozzle 26 and sprayed from the nozzle 26 and applied to the desired spray surface.
An air supply line 30 extends from the compressor 12 to an injection line 40. The system line 32 branches off from the air supply line 30 and receives a portion of the compressed air stream from the air supply line 30. An injected portion of the compressed air ("injection air") flows downstream through the air supply line 30, while a system portion of the compressed air ("system air") flows through the system line 32.
The jet air controller 14 controls the flow of jet air through the air supply line 30. A jet air regulator 70 is disposed on the air supply line 30 and controls the flow of jet air downstream through the air supply line 30. The jet air regulator 70 may be positioned at any desired position between a fully open position that allows the jet air to pass through the air supply line 30 at a maximum flow rate and a fully closed position that prevents any air from flowing downstream through the air supply line 30. The spray air regulator 70 is normally closed and is actuated to an open state by system air when spray is desired. The air pressure regulator 68 controls the flow of system air to the jet air regulator 70 and the pressure provided by the system air determines the degree to which the jet air regulator 70 is open. The user controls the injection air pressure through the air pressure regulator 68. In this way, air pressure regulator 68 controls the flow of system air to jet air regulator 70, and jet air regulator 70 controls the flow of jet air through air supply line 30.
An air filter 54 is disposed on the system line 32 and is configured to remove contaminants from the compressed air flowing in the system line 32. A disconnect 44 is provided on the system line 32. The disconnect 44 is a flow control valve that controls the flow of compressed air into the system line 32 and, in some examples, provides an emergency stop for the vapor injection system 100. With the disconnect 44 in the open state, the compressed air in the system line 32 may flow downstream through the disconnect 44 to power and control various components of the vapor injection system 100. With the disconnect 44 in the closed state, the compressed air in the system line 32 cannot flow downstream past the disconnect 44 to power the components of the vapor injection system 100 and thereby prevent the vapor injection system 100 from injecting.
The system line 32 extends downstream from the disconnect 44 to a system valve 46 and a pump pressure regulator 48. The pump control line 62 is a portion of the system line 32 that extends from the pump pressure regulator 48 to the water pump 18. The pump pressure regulator 48 controls the flow of system air to the water pump 18, thereby controlling the speed and pressure generated by the water pump 18. The water pump 18 is configured to draw water from the water source 16 through the water inlet line 34 and pump the water downstream to the pressurized line 36. A flow valve 50 is disposed on the pressurized line 36 and is configured to regulate the flow of water from the water pump 18 to the pressure tank 20. The flow valve 50 may take any suitable form for regulating water flow, such as one or more needle valves. The user sets the position of the internal components of the flow valve 50 to set the flow rate of the pressurized water flowing to the pressure tank 20. The flow rate of the pressurized water to the pressure tank 20 is directly related to the flow rate of the injected slurry out of the pressure tank 20 so that the flow rate of the injected slurry is controlled by controlling the flow through the flow valve 50. A check valve 52 is provided on the pressurized line 36 between the control valve 122 and the pressure tank 20. The check valve 52 prevents water and media from flowing out of the pressure tank 20 back into the pressurized line 36.
A control valve 122 is provided on the pressurization line 36 between the water pump 18 and the pressure tank 20. The control valve 122 may be controlled between an open state in which pumped water may flow downstream through the control valve 122 to the pressure tank 20 and a closed state in which pumped water may be prevented from flowing to the pressure tank 20. The control valve 122 is a normally open valve such that the control valve 122 remains in an open state unless actuated to a closed state. Control valve 122 may be any suitable valve for controlling the flow of water through pressurized line 36, such as a ball valve, pinch valve, disc valve, gate valve, or any other suitable valve. Control valve 122 controls pressurization of pressure tank 20 and thereby controls the flow of the injected slurry out of pressure tank 20.
The pressure tank 20 is a pressure vessel configured to store the sprayed slurry. The pressure gauge 56 is configured to provide an indication to a user of the pressure level in the pressure tank 20. Relief valve 58 is a valve that allows a user to relieve pressure in pressure tank 20 before opening pressure tank 20. The media line 38 extends downstream from the pressure tank 20 and merges with the air supply line 30 at a junction 42. The media line 38 supplies the injected slurry from the pressure tank 20 to a junction 42 where the injected slurry is entrained in the injected air flowing through the air supply line 30 at the junction 42. A spray line 40 extends from the junction 42 to the nozzle 26 and delivers the entrained spray slurry to the nozzle 26. The nozzle 26 is open and, in some examples, does not include any internal mechanisms for controlling the flow of entrained sprayed slurry out of the nozzle 26.
The media line 38 opens between the pressure tank 20 and the injection line 40 and no valve is provided on the media line 38 to control the flow of injection slurry through the media line 38. Instead, the flow of the injected slurry through the media line 38 is controlled by the pressure in the pressure tank 20. The junction 42 of the media line 38 and the air supply line 30 is located at a height above the maximum filling level of the pressure tank 20 to prevent the sprayed slurry from being conveyed by gravity from the pressure tank 20 to the spray line 40 when spraying is not desired. In addition, the media line 38 is preferably rigid, which further prevents the accumulation of the injected slurry in the media line 38 when the steam injection system 100 is deactivated.
A system control line 60a branches off from the system line 32 and extends to the injection control switch 24. A system control line 60b extends from the injection control switch 24 to the system valve 46. A controlled portion of the compressed air from the compressor 12 flows into the system control line 60 a. The injection control switch 24 may be controlled between an activated state, in which control air may flow from the system control line 60a to the system control line 60b through the injection control switch 24, and a deactivated state, in which the system control line 60a is disconnected from the system control line 60b to prevent control air from flowing from the system control line 60a to the system control line 60 b. In some examples, the spray control switch 24 is integrated with the nozzle 26 or located in close proximity to the nozzle 26 so that the same user can actuate the spray control switch 24 and aim the nozzle 26. For example, the injection control switch 24 may be actuated between the activated state and the deactivated state by a user depressing a trigger of the injection control switch 24.
Although the injection control switch 24 is described as a pneumatic controller, it should be understood that the injection control switch 24 may take any desired form for controlling the state of the system valve 46. For example, the injection control switch 24 may electronically communicate with the system valve 46 via a wired or wireless connection to control the state of the system valve 46. In some examples, injection control switch 24 may be in direct communication with injection air controller 14 and control valve 122 to control the respective states of injection air controller 14 and control valve 122. For example, each of injection air controller 14 and control valve 122 may be electrically actuated by a solenoid valve, and injection air controller 14 may provide an electrical signal to the respective solenoid valve to actuate injection air controller 14 and control valve 122 between an open state and a closed state.
An injection control line 64 and a pressure control line 66 extend downstream from the system valve 46. The injection control line 64 extends to an air pressure regulator 68 and from the air pressure regulator 68 to an injection air regulator 70. The pressure control line 66 extends to a control valve 122. The system valve 46 directs the flow of system air to either the injection control line 64 or the pressure control line 66 depending on the state of the system valve 46. When system valve 46 is in the system-on state, system valve 46 directs system air to injection control line 64 and away from pressure control line 66. Directing system air to injection control line 64 causes injection air regulator 70 to switch to an open state and, because control valve 122 is normally open, returns control valve 122 to an open state. When system valve 46 is in the system closed state, system valve 46 directs system air to pressure control line 66 and away from injection control line 64. Directing system air to pressure control line 66 causes control valve 122 to switch to a closed state and because injection air regulator 70 is normally closed, injection air regulator 70 returns to the closed state.
During operation, the compressor 12 is activated and generates a compressed air stream and provides the compressed air stream to the air supply line 30. The user operates the steam injection system 100 by switching the disconnect 44 to an open state so that system portions may flow downstream from the disconnect 44 through the system line 132. The injected air portion flows downstream through the air supply line 30 toward the injection line 40. System air flows through system line 32 to system valve 46 and water pump 18. Control air flows through system control line 60a to injection control switch 24. The injection control switch 24 is normally closed such that the injection control switch 24 may prevent control air from flowing to the system valve 46 through the system control line 60 b.
The system air flowing to the pump control line 62 initially flows through the pump pressure regulator 48, and the user can set the pump pressure regulator 48 at any desired location to control the water pressure generated by the water pump 18. The system air flows to the water pump 18 and powers the water pump 18. The water pump 18 draws water from the water source 16 through a water inlet line 34 and pumps the water downstream through a pressurized line 36. Water flows through the flow valve 50, and the flow valve 50 limits the flow of water, thereby limiting the flow of the injected slurry out of the pressure tank 20 and through the pressurized line 36 to the pressure tank 20. A control valve 122 is provided on the pressurization line 36 and controls the flow of water to the pressure tank 20. With the control valve 122 in the closed state, the water at the control valve 122 is sealed and does not flow to the pressure tank 20.
The system valve 46 is in a system closed state until the injection control switch 24 is actuated to an activated state in which the control line 60a is connected to the system control line 60 b. In the system closed state, the system valve 46 directs system air to the pressure control line 66. System air flows through pressure control line 66 to control valve 122 and switches the control valve to and maintains it in a closed state. In the closed state, the control valve 122 prevents water pumped into the pressurized line 36 from flowing to the pressure tank 20. In this way, the pressure tank 20 is not pressurized by water and the spray slurry does not flow out of the pressure tank 20 to the media line 38. In a system off condition, the system valve 46 prevents system air from flowing to the injection control line 64. Thus, the jet air regulator 70 is maintained in a normally closed state and prevents jet air from flowing downstream through the air supply line 30. Likewise, with injection control switch 24 in the deactivated state, both injection air regulator 70 and control valve 122 are in their respective closed states.
To begin injection, the user actuates the injection control switch 24 to an activated state in which the system control line 60a is fluidly connected to the system control line 60b such that control air flows to the system control line 60 b. The system control line 60b provides control air to the system valve 46, wherein the control air causes the system valve 46 to switch to a system open state. In the system on state, the system valve 46 directs system air to the injection control line 64 and prevents system air from flowing to the pressure control line 66. System air flows through the injection control line 64 to the injection air regulator 70, wherein the system air switches the injection air regulator 70 to an open state. With the jet air regulator 70 in the open state, jet air flows downstream through the jet air regulator 70 through the air supply line 30 and to the jet line 40. In the event that no system air is holding control valve 122 in the closed state, control valve 122 returns to the normally open state. Thus, both the injection air regulator 70 and the control valve 122 are opened with the injection control switch 24 in the activated state.
With the control valve 122 in the open state, pumped water from the water pump 18 flows through the pressurization line 36 to the pressure tank 20. The pumped water pressurizes the pressure tank 20 and the increased pressure within the pressure tank 20 drives the spray slurry out of the pressure tank 20 and downstream through the media line 38 to the junction 42. The blast slurry is entrained in the blast portion of the air at the junction 42, and the entrained blast slurry is driven downstream through the blast line 40 and discharged from the nozzle 26.
To stop the injection, the user returns the injection control switch 24 to the deactivated state, for example, by releasing the trigger of the injection control switch 24. In the deactivated state, the injection control switch 24 prevents control air from flowing from the system control line 60a to the system control line 60 b. The system valve 46 returns to the system closed state. In the system closed state, system valve 46 prevents system air from flowing through injection control line 64 to injection air regulator 70 to return injection air regulator 70 to the normally closed position, and directs system air through pressure control line 66 to control valve 122 to cause control valve 122 to switch to the closed state. When in the closed state, control valve 122 prevents water from flowing to pressure tank 20 and pressurizes pressure tank 20. Without the flow of pressurized water, the pressure in the pressure tank 20 drops. The reduced pressure is at a level insufficient to drive the injected slurry downstream through the media line 38. Thus, the injection is stopped by stopping the flow of water to the pressure tank 20.
The vapor injection system 100 includes logic, such as control logic 28 (FIG. 1), to prevent undesirable accumulation of the injection medium in the injection line 40. When system valve 46 switches to the system open position, the logic ensures that injection air regulator 70 switches to the open position before control valve 122 switches to the open position. In this way, the injection air flows to the injection line 40 and through the injection line 40 before the injection slurry starts to flow to the injection line 40. Flowing the blast air through the blast line 40 prior to introducing the blast slurry prevents undesirable build-up of the blast slurry in the blast line 40 and ensures a smooth, high quality flow of entrained blast slurry out of the nozzle 26. When system valve 46 switches to the system off state, the logic ensures that control valve 122 switches to the off state before injection air regulator 70 switches to the off state. Switching the control valve 122 to the closed state before switching the injection air regulator 70 to the closed state ensures that the injection air continues to flow to the injection line 40 when the pressure tank 20 is depressurized, thereby preventing an undesired accumulation of the injection slurry in the injection line 40.
The vapor injection system 100 provides significant advantages. A control valve 122 is disposed upstream of the pressure tank 20 and controls the flow of pressurized water to the pressure tank 20. Controlling the flow of pressurized water to the pressure tank 20 controls the pressurization of the pressure tank 20 and thus the flow of the injected slurry from the pressure tank 20. No valve is provided downstream of the pressure tank 20. Instead, injection is directly controlled by controlling the pressurization of pressure tank 20. Eliminating valves downstream of pressure tank 20 in the flow path of the injection medium reduces maintenance requirements on vapor injection system 100, thereby reducing maintenance costs and downtime. In addition, positioning the junction 42 at a height above the maximum fill level of the pressure tank 20 may prevent undesired outflow of the injected slurry from the media line 38. The control logic ensures that the injection air starts to flow through the injection line 40 before the injection slurry flows to the injection line 40 and that the injection air continues to flow through the injection line 40 when the pressure tank 20 is depressurized, which eliminates clogging and undesired accumulation of the injection slurry in the injection line 40.
Fig. 3 is a schematic diagram of a steam injection system 200. The vapor injection system 200 includes a compressor 12, an injection air controller 14, a water source 16, a water pump 18, a pressure tank 20, an injection control switch 24, a nozzle 26, an air supply line 30, a system line 32, a water inlet line 34, a pressurization line 36, a media line 38, an injection line 40, a junction 42, a disconnect 44, a system valve 46, a pump pressure regulator 48, a flow valve 50, a check valve 52, an air filter 54, a pressure gauge 56, a pressure relief valve 58, a system control line 60a, a system control line 60b, a pump control line 62, an injection control line 64, a pressure control line 66, and a control valve 222. The jet air controller 14 includes an air pressure regulator 68 and a jet air regulator 70.
A pressure control line 66 extends from the system valve 46 to a control valve 222. Control valve 222 controls the flow of system air to water pump 18. The control valve 222 is a normally open valve, and when the system valve 46 is in the system closed state, the control valve 222 is switched to the closed state. When system valve 46 is in the system-on state, control valve 222 returns to the open state such that system valve 46 directs system air to injection control line 64.
The control valve 222 is controlled between an open state and a closed state to control pressurization of the pressure tank 20. Actuating the control valve 222 to the closed state stops the flow of system air to the water pump 18, thereby deactivating the water pump 18. Deactivating the water pump 18 prevents the water pump 18 from pumping water through the pressurization line 36 to the pressure tank 20, thereby allowing the pressure in the pressure tank 20 to drop. The reduced pressure in the pressure tank 20 is low enough that the pressure does not drive the spray slurry downstream through the media line 38 to the spray line 40. The pressure tank 20 is maintained at a reduced pressure and the injected slurry remains in the pressure tank 20 until the control valve 222 is switched to an open state.
When the system valve 46 is in the system-on state, the system valve 46 switches the control valve 222 to the open state. In the open state, the control valve 222 allows system air to flow to the water pump 18 and power the water pump 18. The water pump 18 draws water from the water source 16 and pumps the water through a pressurized line 36 to the pressure tank 20. The pumped water increases the pressure in the pressure tank 20 and the increased pressure drives the spray slurry downstream from the pressure tank 20 through the media line 38 to the junction 42 where the spray slurry is entrained in the spray air and driven downstream through the spray line 40 and discharged from the nozzle 26.
The steam injection system 200 includes logic, such as control logic 28 (fig. 1), to prevent the accumulation of injected slurry in the injection line 40. When the system valve 46 switches to the system on state, the logic ensures that the injection air regulator 70 switches to the on state before the control valve 222 switches to the on state. When system valve 46 switches to the system off state, the logic ensures that control valve 222 switches to the off state before injection air regulator 70 switches to the off state.
Fig. 4 is a schematic diagram of a steam injection system 300. The vapor injection system 210 includes a compressor 12, an injection air controller 14, a water source 16, a water pump 18, a pressure tank 20, an injection control switch 24, a nozzle 26, an air supply line 30, a system line 32, a water inlet line 34, a pressurization line 36, a media line 38, an injection line 40, a junction 42, a disconnect 44, a system valve 46, a pump pressure regulator 48, a flow valve 50, a check valve 52, an air filter 54, a pressure gauge 56, a pressure relief valve 58, a system control line 60a, a system control line 60b, a pump control line 62, an injection control line 64, a pressure control line 66, and a control valve 322. The jet air controller 14 includes an air pressure regulator 68 and a jet air regulator 70. The water pump 18 includes a diverter valve 72, and the diverter valve 72 includes a shuttle member 74.
The steam injection system 300 is substantially similar to the steam injection system 10 shown in fig. 1, the steam injection system 100 shown in fig. 2, and the steam injection system 200 shown in fig. 3, except that similar to the control valve 22c (fig. 1), the control valve 322 of the steam injection system 300 mechanically interacts with the water pump 18 to control the flow of pressurized water to the pressure tank 20.
A pressure control line 66 extends from the system valve 46 to a control valve 322. The water pump 18 includes a diverter valve 72, the diverter valve 72 including a reciprocating shuttle member that directs system air received from the pump control line 62 to the power water pump 18. When the control valve 322 is in the closed state, the control valve 322 inhibits the reciprocating movement of the shuttle member 74 of the selector valve 72 to prevent the water pump 18 from pumping water to the pressure tank 20. For example, the control valve 322 may be configured to extend a pin into the reversing valve 72 to mechanically dampen the reciprocating motion of the shuttle member 74. With the control valve 322 in the open position, the shuttle member 74 is free to reciprocate and direct the flow of system air to power the water pump 18.
When system valve 46 is in the system closed state and directs system air through pressure control line 66, control valve 322 is normally open and switches to the closed state. Control valve 322 returns to an open state when system valve 46 is in a system open state and directs system air to injection control line 64.
The control valve 322 is controlled between an open state and a closed state to control pressurization of the pressure tank 20. Actuating the control valve 322 to the closed state deactivates the water pump 18. Deactivating the water pump 18 prevents the water pump 18 from pumping water through the pressurization line 36 to the pressure tank 20, thereby allowing the pressure in the pressure tank 20 to drop. The reduced pressure in pressure tank 20 is low enough that the pressure does not drive the spray slurry downstream through media line 38 to spray line 40. The pressure tank 20 is kept at a reduced pressure and the sprayed slurry remains in the pressure tank 20 until the control valve 322 is switched to an open state and the water pump 18 pumps water to the pressure tank 20.
The steam injection system 300 includes logic, such as control logic 28 (fig. 1), to prevent undesirable accumulation of injected slurry in the injection line 40. When system valve 46 switches to the system on state, the logic ensures that injection air regulator 70 switches to the on state before control valve 322 switches to the on state. When system valve 46 switches to the system off state, the logic ensures that control valve 322 switches to the off state before injection air regulator 70 switches to the off state.
Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention.
Claims (20)
1. A blasting system, comprising:
a water pump configured to pump a flow of water from a water source through a water line to a pressure tank;
an air supply line extending from an air source;
a media line extending from the pressure tank to the air supply line;
an injection line extending downstream from a junction of the media line and the air supply line to a nozzle;
a control valve configured to switch between an open state and a closed state to control the water flow to the pressure tank to control the flow of injected slurry from the pressure tank to the media line; and
an injection control switch controllable between an activated state and a deactivated state and configured to actuate the control valve between the open state and the closed state.
2. The blasting system of claim 1, wherein the media line is connected to the pressure tank at a first location and the media line is connected to the junction at a second location, and wherein the second location is disposed at a height that is higher than a maximum water level in the pressure tank.
3. The blasting system of claim 1, wherein the control valve is disposed on a portion of the water line between the water pump and the pressure tank.
4. The blasting system of claim 1, wherein the control valve is configured to control activation of the water pump to control the flow of water to the pressure tank.
5. The blasting system of claim 4, further comprising:
a system line extending from the air supply line to the water pump, the system line configured to provide compressed air from the air supply line to the water pump to power the water pump;
wherein the control valve is a valve disposed on the system line between the air supply line and the water pump, the control valve configured to control a flow of compressed air to the pump.
6. The blasting system of claim 4, wherein the control valve is configured to mechanically interact with the water pump to prevent the water pump from pumping the flow of water when the control valve is in the closed state.
7. The blasting system of claim 1, further comprising:
a jet air controller configured to control a jet air flow through the air supply line;
wherein the injection control switch is configured to actuate the injection air controller between a controller-on state and a controller-off state.
8. The blasting system of claim 7, further comprising:
a system valve provided on a system line branching from the air supply line;
an injection control line extending from the system valve to the injection air controller;
a pressurized control line extending from the system valve to the control valve;
wherein the system valve is configured to direct the system air flow to the injection control line based on the injection control switch being in the activated state and to direct the system air flow to the pressurization control line based on the injection control switch being in the deactivated state.
9. The blasting system of claim 8, further comprising:
a first pneumatic control line extending from the air supply line to the injection control switch;
a second pneumatic control line extending from the injection control switch to the system valve;
wherein the injection control switch, when in the activated state, fluidly connects the first pneumatic control line to the second pneumatic control line to enable compressed air from the air supply line to flow to and actuate the system valve.
10. The blasting system of claim 8, wherein the jet air controller is normally closed such that the system air flow actuates the jet air controller to the controller open state and the control valve is normally open such that the system air flow actuates the control valve to the closed state.
11. The blasting system of claim 1, further comprising:
control logic configured to implement a delay between switching of the control valve between the open state and the closed state and switching of the injection air controller between the controller open state and the controller closed state;
wherein the control logic causes the injection air controller to switch to the controller open state before the control valve switches to the open state; and
wherein the control logic causes the injection air controller to switch to the controller off state after the control valve switches to the off state.
12. The blasting system of claim 1, wherein no valve is provided downstream of the pressure tank to control the flow of the blast slurry through any of the media line, the blast line, and the nozzle during blasting.
13. A method, comprising:
generating a compressed air stream and directing the compressed air stream to an air supply line extending to a junction with a media line extending from a pressure tank and configured to deliver a jet slurry stream from the pressure tank to the junction;
pumping pressurized water flow to the pressure tank with a water pump through a water line extending between the water pump and the pressure tank; and
controlling actuation of a control valve between an open state and a closed state with a spray control switch to control the flow of pressurized water to the pressure tank and the flow of sprayed slurry through the media line.
14. The method of claim 13, wherein:
the control valve is arranged on the water pipeline; and
the control valve allows the flow of pressurized water to the pressure tank and pressurizes the pressure tank when in the open state, and prevents the flow of pressurized water to the pressure tank and pressurizes the pressure tank when in the closed state.
15. The method of claim 13, wherein:
the control valve is disposed on a pump air supply line that supplies pump air to the water pump to power the water pump; and
the control valve allows the pump air to flow to and power the water tank when in the open state, and prevents the pump air from flowing to and powering the water pump when in the closed state.
16. The method of claim 13, wherein:
the control valve mechanically interacts with the water pump to control pumping by the water pump; and
the control valve restricts reciprocating movement of a pump member of the water pump when in the closed state to prevent the water pump from pumping water to the pressure tank, and the control valve allows reciprocating movement of the pump member when in the open state to allow the water pump to pump the water to the pressure tank.
17. The method of claim 13, further comprising:
controlling, with the injection control switch, actuation of an injection air controller disposed on the air supply line between a controller-on state in which the injection air controller allows the compressed air to flow through the air supply line to the junction and a controller-off state in which the injection air controller prevents the compressed air from flowing through the air supply line to the junction;
wherein the injection air controller is configured to be in the controller open state when the control valve is in the open state, and the injection air controller is configured to be in the controller closed state when the control valve is in the closed state.
18. The method of claim 17, further comprising:
delaying switching of the control valve to the open state until after the injection air controller switches to the controller open state; and
delaying switching of the injection air controller to the controller closed state until after the control valve is switched to the closed state.
19. A control system for a vapor injection system, the vapor injection system having: a pressure tank storing a supply of injected slurry; a compressor for providing a flow of compressed air through an air supply line to an injection line; and a water pump for pumping water to the pressure tank to pressurize the pressure tank and to drive the injected slurry exiting the pressure tank downstream through a media line to the injection line where it can be entrained in the compressed air and carried out of the nozzle, the control system comprising:
a control valve configured to switch between an open state and a closed state to control the flow of water from the water pump to the pressure tank, wherein the control valve is configured to prevent the flow of water to and pressurize the pressure tank when in the closed state and configured to allow the flow of water to and pressurize the pressure tank when in the open state;
a jet air controller disposed on the air supply line upstream of the jet line, the jet air controller configured to switch between a controller-on state and a controller-off state to control the flow of compressed air to the jet line, wherein the jet air controller is configured to prevent the flow of compressed air to the jet line when in the controller-off state and to allow the flow of compressed air to the jet line when in the controller-on state; and
an injection control switch configured to control the control valve between the open state and the closed state, and further configured to control the injection air controller between the controller open state and the controller closed state;
wherein the stream of sprayed slurry exiting the pressure tank is started and stopped by a flow of water to the pressure tank.
20. The control system of claim 19, wherein no valve is provided downstream of the pressure tank to control the flow of the injected slurry through any of the media line, the injection line and the nozzle during injection.
Applications Claiming Priority (3)
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|---|---|---|---|
| US201762519235P | 2017-06-14 | 2017-06-14 | |
| US62/519,235 | 2017-06-14 | ||
| PCT/US2018/037578 WO2018232141A1 (en) | 2017-06-14 | 2018-06-14 | Abrasive blast system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110753602A true CN110753602A (en) | 2020-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880040130.4A Pending CN110753602A (en) | 2017-06-14 | 2018-06-14 | Sand blasting system |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20200094377A1 (en) |
| EP (1) | EP3638452A4 (en) |
| CN (1) | CN110753602A (en) |
| AU (1) | AU2018285510A1 (en) |
| CA (1) | CA3066928A1 (en) |
| WO (1) | WO2018232141A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114074036A (en) * | 2020-08-11 | 2022-02-22 | 固瑞克明尼苏达有限公司 | Battery-powered fluid injector |
| US11878321B2 (en) | 2020-08-11 | 2024-01-23 | Graco Minnesota Inc. | Battery powered fluid sprayer |
| US12097524B2 (en) | 2021-07-20 | 2024-09-24 | Graco Minnesota Inc. | Fluid sprayer with covered battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11590631B2 (en) * | 2019-08-14 | 2023-02-28 | Clean Blast Systems, LLC | Wet abrasive blast machine with remote control rinse cycle |
| GB2594298B (en) * | 2020-04-22 | 2024-03-27 | Elcometer Ltd | A control system for abrasive blasting apparatus and abrasive blasting apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114074036A (en) * | 2020-08-11 | 2022-02-22 | 固瑞克明尼苏达有限公司 | Battery-powered fluid injector |
| US11878321B2 (en) | 2020-08-11 | 2024-01-23 | Graco Minnesota Inc. | Battery powered fluid sprayer |
| US11964291B2 (en) | 2020-08-11 | 2024-04-23 | Graco Minnesota Inc. | Power control for a fluid sprayer with battery power |
| US12097524B2 (en) | 2021-07-20 | 2024-09-24 | Graco Minnesota Inc. | Fluid sprayer with covered battery |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2018285510A1 (en) | 2020-01-02 |
| CA3066928A1 (en) | 2018-12-20 |
| EP3638452A4 (en) | 2021-03-10 |
| EP3638452A1 (en) | 2020-04-22 |
| WO2018232141A1 (en) | 2018-12-20 |
| US20200094377A1 (en) | 2020-03-26 |
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