Mass flow controller
First Claim
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1. A mass flow controller comprising:
- a base having a first passage through which a fluid passes, an inlet portion for introducing the fluid into the first passage and an outlet portion for releasing the fluid from the first passage;
a mass flow sensor connected to the first passage adjacent to the inlet portion for measuring a mass flow of the fluid passing through the first passage;
a first control valve connected to the first passage adjacent to the outlet portion for controlling the mass flow of the fluid passing through the first passage;
a valve controller that compares the mass flow measured by the mass flow sensor to a standard flow and for controlling the first control valve to correspond the mass flow of the fluid to the standard flow; and
a second control valve connected to the first passage adjacent to the inlet portion for controlling a full scale of the mass flow of the fluid passing through the first passage, wherein the second control valve includes a valve body that controls an opened sectional area of the first passage and a driving unit that traverses the first passage with the valve body, wherein the valve body includes a shape corresponding to a sectional shape of the first passage and a plurality of holes through which the fluid passes.
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Abstract
A mass flow controller includes a base having a passage that allows a fluid to pass through the passage. A first control valve controls a mass flow of a fluid passing through the passage. A second control valve controls a full scale of the mass flow of the fluid. A bypass portion is disposed in the passage through which the fluid passes. A mass flow sensor measures the mass flow of the fluid passing through the bypass portion. The second control valve is connected to the passage adjacent to the bypass portion for controlling the full scale of the mass flow of the fluid passing through the bypass portion.
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Citations
11 Claims
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1. A mass flow controller comprising:
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a base having a first passage through which a fluid passes, an inlet portion for introducing the fluid into the first passage and an outlet portion for releasing the fluid from the first passage; a mass flow sensor connected to the first passage adjacent to the inlet portion for measuring a mass flow of the fluid passing through the first passage; a first control valve connected to the first passage adjacent to the outlet portion for controlling the mass flow of the fluid passing through the first passage; a valve controller that compares the mass flow measured by the mass flow sensor to a standard flow and for controlling the first control valve to correspond the mass flow of the fluid to the standard flow; and a second control valve connected to the first passage adjacent to the inlet portion for controlling a full scale of the mass flow of the fluid passing through the first passage, wherein the second control valve includes a valve body that controls an opened sectional area of the first passage and a driving unit that traverses the first passage with the valve body, wherein the valve body includes a shape corresponding to a sectional shape of the first passage and a plurality of holes through which the fluid passes. - View Dependent Claims (2, 3, 4)
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5. A mass flow controller comprising:
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a base having a first passage through which a fluid passes, an inlet portion for introducing the fluid into the first passage and an outlet portion for releasing the fluid from the first passage; a mass flow sensor connected to the first passage adjacent to the inlet portion for measuring a mass flow of the fluid passing through the first passage; a first control valve connected to the first passage adjacent to the outlet portion for controlling the mass flow of the fluid passing through the first passage; a valve controller that compares the mass flow measured by the mass flow sensor to a standard flow and for controlling the first control valve to correspond the mass flow of the fluid to the standard flow; a second control valve connected to the first passage adjacent to the inlet portion for controlling a full scale of the mass flow of the fluid passing through the first passage; and
a bypass portion through which the fluid passes disposed in the first passage adjacent to the inlet portion, wherein the bypass portion includes a plurality of capillaries, wherein the second control valve includes a valve body that opens/closes the capillaries and a driving unit that traverses the first passage with the valve body. - View Dependent Claims (6)
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7. A mass flow controller comprising:
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a base having a first passage through which a fluid passes, an inlet portion for introducing the fluid into the first passage and an outlet portion for releasing the fluid from the first passage; a mass flow sensor connected to the first passage adjacent to the inlet portion for measuring a mass flow of the fluid passing through the first passage; a first control valve connected to the first passage adjacent to the outlet portion for controlling the mass flow of the fluid passing through the first passage; a valve controller that compares the mass flow measured by the mass flow sensor to a standard flow and for controlling the first control valve to correspond the mass flow of the fluid to the standard flow; a second control valve connected to the first passage adjacent to the inlet portion for controlling a full scale of the mass flow of the fluid passing through the first passage, and a bypass portion through which the fluid passes disposed in the first passage adjacent to the inlet portion, wherein the bypass portion includes a sectional shape corresponding to a sectional shape of the first passage and a plurality of second passages through which the fluid passes, wherein the second control valve comprises; a valve body disposed on a side of the bypass portion and having a plurality of holes corresponding to the second passages; and a driving unit that varies positions of the valve body to control the full scale of the mass flow of the fluid passing through the second passages and the holes.
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8. A mass flow controller comprising:
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a base mounted on a gas pipe and having a first passage through which the gas passes, an inlet portion for introducing the gas into the passage and an outlet portion for releasing the gas from the passage; a bypass portion disposed in the first passage, the gas passing through the bypass portion; a mass flow sensor that measures a mass flow of a sample gas extracted from the gas passing through the bypass portion and generates a signal corresponding to the measured mass flow; a first control valve, connected to the passage adjacent to the outlet portion, that controls the mass flow of the gas passing through the first passage; a valve controller that compares the signal generated from the mass flow sensor to a standard signal and controls the first control valve to correspond the mass flow of the fluid to the standard flow; and a second control valve, connected to the first passage adjacent to the bypass portion, which controls a full scale of the mass flow of the gas passing through the bypass portion, wherein the second control valve includes a valve body for controlling an opened sectional area of the first passage and a driving unit traversing the first passage with the valve body, wherein the valve body includes a shape corresponding to a sectional shape of the first passage and a plurality of holes through which the gas passes.
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9. A mass flow controller comprising:
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a base mounted on a gas pipe and having a first passage through which the gas passes, an inlet portion for introducing the gas into the passage and an outlet portion for releasing the gas from the passage; a bypass portion disposed in the first passage, the gas passing through the bypass portion; a mass flow sensor that measures a mass flow of a sample gas extracted from the gas passing through the bypass portion and generates a signal corresponding to the measured mass flow; a first control valve, connected to the passage adjacent to the outlet portion, that controls the mass flow of the gas passing through the first passage; a valve controller that compares the signal generated from the mass flow sensor to a standard signal and controls the first control valve to correspond the mass flow of the fluid to the standard flow; and a second control valve, connected to the first passage adjacent to the bypass portion, which controls a full scale of the mass flow of the gas passing through the bypass portion, wherein the bypass portion includes a plurality of capillaries, and the second control valve includes a valve body that opens/closes the capillaries and a driving unit that traverses the passage with the valve body.
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10. A mass flow controller comprising:
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a base mounted on a gas pipe and having a first passage through which the gas passes, an inlet portion for introducing the gas into the passage and an outlet portion for releasing the gas from the passage; a bypass portion disposed in the first passage, the gas passing through the bypass portion; a mass flow sensor that measures a mass flow of a sample gas extracted from the gas passing through the bypass portion and generates a signal corresponding to the measured mass flow; a first control valve, connected to the passage adjacent to the outlet portion, that controls the mass flow of the gas passing through the first passage; a valve controller that compares the signal generated from the mass flow sensor to a standard signal and controls the first control valve to correspond the mass flow of the fluid to the standard flow; and a second control valve, connected to the first passage adjacent to the bypass portion, which controls a full scale of the mass flow of the gas passing through the bypass portion, wherein the bypass portion includes a first sectional shape corresponding to a sectional shape of the passage and a plurality of second passages through which the gas passes, wherein the second control valve comprises; a valve body disposed on a side of the bypass portion and having a plurality of holes corresponding to the second passages; and a driving unit that varies positions of the valve body to control the full scale of the mass flow of the gas passing through the second passages and the holes. - View Dependent Claims (11)
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Specification