Although blowers are commonly used in manufacturing, it can be difficult to find good sources of information on the different types of blowers and how to choose the appropriate one. The purpose of this article series is to give a good, basic understanding of the different types of blowers and provide you with the technical information required to make a good decision for your application.
Recommended Reading What are the different types of blowers?
At its most basic level a blower is a tool that draws in air at an inlet and pushes air out as a steady stream at the outlet. Blowers can largely be classified into two categories: impeller based and positive displacement. Impeller based blowers have fins that radiate outwards from a rotating central axis. Positive displacement blowers use a mechanism of filling and emptying chambers at the inlet and outlet, respectively, to create flow. The fundamental difference between the two is that impeller based blowers have output flow that varies with pressure whereas positive displacement blowers have a more constant output flow less affected by changes in operating pressure.
Specialty Blowers
When an environment is unusually harsh—such as explosive, corrosive, or hot environments—a normal blower design must be adapted in order to operate safely.
Repairing plastic boxes or containers is an issue in many industries. Repairing rather than replacing helps save money and is better for the environment. In this video we show you how easy it can be to repair a container if you follow the appropriate steps.
Although blowers are commonly used in manufacturing, it can be difficult to find good sources of information on the different types of blowers and how to choose the appropriate one. The purpose of this article series is to give a good, basic understanding of the different types of blowers and provide you with the technical information required to make a good decision for your application.
Recommended Reading What are the different types of blowers?
At its most basic level a blower is a tool that draws in air at an inlet and pushes air out as a steady stream at the outlet. Blowers can largely be classified into two categories: impeller based and positive displacement. Impeller based blowers have fins that radiate outwards from a rotating central axis. Positive displacement blowers use a mechanism of filling and emptying chambers at the inlet and outlet, respectively, to create flow. The fundamental difference between the two is that impeller based blowers have output flow that varies with pressure whereas positive displacement blowers have a more constant output flow less affected by changes in operating pressure.
Although blowers are commonly used in manufacturing, it can be difficult to find good sources of information on the different types of blowers and how to choose the appropriate one. The purpose of this article series is to give a good, basic understanding of the different types of blowers and provide you with the technical information required to make a good decision for your application.
Recommended Reading What are the different types of blowers?
At its most basic level a blower is a tool that draws in air at an inlet and pushes air out as a steady stream at the outlet. Blowers can largely be classified into two categories: impeller based and positive displacement. Impeller based blowers have fins that radiate outwards from a rotating central axis. Positive displacement blowers use a mechanism of filling and emptying chambers at the inlet and outlet, respectively, to create flow. The fundamental difference between the two is that impeller based blowers have output flow that varies with pressure whereas positive displacement blowers have a more constant output flow regardless of change in pressure.
2. Positive Displacement Blowers
Positive displacement blowers create flow by filling and emptying chambers of air; these blowers produce flow which is relatively independent of operating pressure. There are several variations available which use the same premise but slightly different design. Here we discuss two popular types: rotary vane and rotary lobe.
Although blowers are commonly used in manufacturing, it can be difficult to find good sources of information on the different types of blowers and how to choose the appropriate one. The purpose of this article series is to give a good, basic understanding of the different types of blowers and provide you with the technical information required to make a good decision for your application.
What are the different types of blowers?
At its most basic level a blower is a tool that draws in air at an inlet and pushes air out as a steady stream at the outlet. Blowers can largely be classified into two categories: impeller based and positive displacement. Impeller based blowers have fins that radiate outwards from a rotating central axis. Positive displacement blowers use a mechanism of filling and emptying chambers at the inlet and outlet, respectively, to create flow. The fundamental difference between the two is that impeller based blowers have output flow that varies with pressure whereas positive displacement blowers have a more constant output flow regardless of change in pressure.
1. Impeller based blowers
There are two main categories of impeller based blowers: centrifugal and regenerative. Each has different characteristics which lend themselves to different applications; but they both have output flow that vary greatly with changing operating pressure.
Closed-Loop Vs Open-Loop Control Systems Part 3 of 3: When Open-Loop is the Correct Choice4/20/2018
In a previous article, Temperature Control of Air Heaters, we provided a general overview of control for process heat systems and explained the difference between closed- and open-loop controls. Briefly, a closed-loop system is output driven; the output of the system is continually measured and fed back to control components which adjust the operation of the tool to bring its output into alignment with a pre-set target. An open-loop system has no feedback loop and, as a result, the output of the tool does not impact its continued operation. For example, in a closed-loop process heat system if the inlet air increases in temperature the tool output temperature will briefly increase before the control system brings it back to setpoint, however in an open-loop system the tool output temperature will increase and no corrective action will occur.
In this article series we will expand on this topic, exploring when it is advantageous to use a closed-loop system and when it is acceptable to use an open-loop system. The first installment looked at the benefits of automating your system, the second installment looked at developing a better understanding of your process. This third installment will look at when an open-loop system is a good choice for your application. Based on DVS 2207-4
1) Measured with an insert thermometer at the exrudate outlet of the hand extruder.
2) Measured 5mm in the nozzle, in the centre of the nozzle opening. 3) Drawn-in cold air volume at the ambient pressure. 4) PE 63, PE 80, PE 100 5) Depending on the preheating 6) LEISTER empiric parameters 7) Welding rod has to be pre-dryed Please note: The indicated welding parameter may vary depending on the ambient temperature and the material configuration. Test welds need to be done and the parameter aligned accordingly! Leister takes no responsibility for poor quality welding! Based on DVS 2207-3
1) Measured 5mm in the nozzle, in the centre of the nozzle opening.
2) Drawn-in cold air volume at the ambient pressure. 3) Depending on the welding filler material diameter and the welding groove geometry. 4) PE 63, PE 80, PE 100 5) Nitrogene recommended 6) LEISTER empiric parameters Please note: The indicated welding parameter may vary depending on the ambient temperature and the material configuration. Test welds need to be done and the parameter aligned accordingly! STANMECH takes no responsibility for poor quality welding! Growing insulation requirements have resulted in changes to roof structures in recent years. Rigid polyurethane (PUR), polyisocyanurate (PIR) or thicker mineral wool insulating materials with a higher level of compressive strength are now installed on the upper side of the roof deck. During the welding process, these insulating materials demonstrate virtually no elastic behavior resulting in a harder welding surface. This may cause air inclusions (bubbles) to form in the weld seam of mechanically fastened PVC roof sealing sheets under certain conditions, particularly if the roof substrate is uneven.
The new rake nozzle kit from Leister ensures that all leak-tightness and aesthetic requirements are met even in roof structures of this nature. The rake nozzle provides constant pressure on the lower PVC sheet. The soft silicone pressure roller ensures the pressure is distributed as effectively as possible over uneven and hard substrates. If you're having problems with air inclusions in your welds, contact us today for more details.
In a previous article, Temperature Control of Air Heaters, we provided a general overview of control for process heat systems and explained the difference between closed- and open-loop controls. Briefly, a closed-loop system is output driven; the output of the system is continually measured and fed back to control components which adjust the operation of the tool to bring its output into alignment with a pre-set target. An open-loop system has no feedback loop and, as a result, the output of the tool does not impact its continued operation. For example, in a closed-loop process heat system if the inlet air increases in temperature the tool output temperature will briefly increase before the control system brings it back to setpoint, however in an open-loop system the tool output temperature will increase and no corrective action will occur.
In this article series we will expand on this topic, exploring when it is advantageous to use a closed-loop system and when it is acceptable to use an open-loop system. The first installment looked at the benefits of automating your system. This second installment will look at an important secondary benefit that emerges from using a closed-loop control system: developing a better understanding of your process. Know Your Operating Parameters
Open-loop systems are often controlled using a percentage power setting (i.e., setting the dial on the tool to 6 out of 10). This is because without a feedback system, there is no way to verify if it has reached a target temperature setpoint. If you are installing a closed-loop system for the first time, it is possible that you won’t know your exact target temperature for certain. This is normal and determining that temperature setpoint will be an important step during the commissioning of the system. Once established, there are considerable advantages to knowing your exact operating temperature.
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