Liquid supply apparatus
First Claim
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1. A liquid supply apparatus, comprising:
- an elongated cylinder including a head portion with an opening, and an open rear portion;
a piston which is inserted into the cylinder and hermetically divides an inner space of the cylinder into a liquid compartment on the side of the head portion and a gas compartment on the side of the rear portion;
a gas supply apparatus connected to the rear portion of the cylinder and constructed to supply the gas compartment with gas such that the piston is moved toward the head portion when the gas is supplied to the gas compartment;
wherein the piston comprises a body and a sealing ring which surrounds the body and is in contact with an inner surface of the cylinder, and the sealing ring comprises an inner base fixed to the body and an outer wing which is connected to the base and is in contact with the inner surface of the cylinder;
wherein the piston comprises at least two sealing rings, and the outer wing of one of the sealing rings on a side of the liquid compartment extends toward the liquid compartment and the outer wing of the other sealing ring on a side of the gas compartment extends toward the gas compartment; and
wherein a sealing ring on a side of the liquid compartment and a sealing ring on a side of the gas compartment are sealing rings with a substantially identical dimension, and a radius of the bottom of the groove in the piston body into which the sealing ring on the side of the gas compartment is fitted is larger than that of the bottom of the groove into which the sealing ring on the side of the liquid compartment is fitted.
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Abstract
A liquid supply apparatus is provided. The liquid supply apparatus has a cylinder, a piston and a gas supply apparatus. The cylinder is provided with a head portion with outlet. The cylinder has a rear end opened. The piston is inserted into the cylinder. The piston moves along the longitudinal direction of the cylinder so as to supply liquid contained in the cylinder. The gas supply apparatus generates and supplies gas to push the piston. The piston has a pair of sealing ring. The sealing ring has a base attached to a body of the piston and a outer wing connected to the base. The gas supply apparatus has a gas pressure regulator.
43 Citations
21 Claims
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1. A liquid supply apparatus, comprising:
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an elongated cylinder including a head portion with an opening, and an open rear portion; a piston which is inserted into the cylinder and hermetically divides an inner space of the cylinder into a liquid compartment on the side of the head portion and a gas compartment on the side of the rear portion; a gas supply apparatus connected to the rear portion of the cylinder and constructed to supply the gas compartment with gas such that the piston is moved toward the head portion when the gas is supplied to the gas compartment; wherein the piston comprises a body and a sealing ring which surrounds the body and is in contact with an inner surface of the cylinder, and the sealing ring comprises an inner base fixed to the body and an outer wing which is connected to the base and is in contact with the inner surface of the cylinder; wherein the piston comprises at least two sealing rings, and the outer wing of one of the sealing rings on a side of the liquid compartment extends toward the liquid compartment and the outer wing of the other sealing ring on a side of the gas compartment extends toward the gas compartment; and wherein a sealing ring on a side of the liquid compartment and a sealing ring on a side of the gas compartment are sealing rings with a substantially identical dimension, and a radius of the bottom of the groove in the piston body into which the sealing ring on the side of the gas compartment is fitted is larger than that of the bottom of the groove into which the sealing ring on the side of the liquid compartment is fitted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15, 16, 17, 18, 19, 20, 21)
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9. The liquid supply apparatus comprising:
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an elongated cylinder including a head portion with an opening, and an open rear portion; a piston which is inserted into the cylinder and hermetically divides an inner space of the cylinder into a liquid compartment on the side of the head portion and a gas compartment on the side of the rear portion; a gas supply apparatus connected to the rear portion of the cylinder and constructed to supply the gas compartment with gas such that the piston is moved toward the head portion when the gas is supplied to the gas compartment; wherein the gas supply apparatus comprises an outer wall and a partition connected to the outer wall, and the partition of the gas supply apparatus is provided with a bore through which the gas compartment and the outside of the cylinder communicate with each other, and the gas supply apparatus further comprises a pressure regulator provided in the bore; wherein the bore is cylindrical and connected to the gas compartment through a connection passage formed in the bottom of the bore, and the pressure regulator comprises; a sealing ring which surrounds the connection passage, is fixed to the bottom, and has an end protruding from the bottom, an opening/closing member including a contact wall with a contact surface which selectively comes into contact with or is separated from the end of the sealing ring, an inner wall axially extending from a central portion of the contact wall, and a conical slant wall protruding from an end of the inner wall to a side opposite to the connection passage, thereby moving in an axial direction of the bore, and an elastic member for urging the opening/closing member toward the sealing ring. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification