Electronically controlled regulator
An electronically controlled regulator may include a pressure regulating valve. The pressure regulating valve may include a valve shaft, a valve seat, and a discharge pressure regulating unit. The discharge pressure regulating unit may regulate a pressure of a fluid by causing the valve shaft to reciprocate through driving of an electric motor electronically controlled to change a distance between a valve body and the valve seat. A high-pressure fluid introduced from an introduction port may be discharged from a discharge port as a depressurized fluid at a set pressure on a side of a discharge pressure chamber while being depressurized and regulated. A piston may receive a fluid pressure in the discharge pressure chamber, which pressure may be converted into a pressure load in a direction where the valve body is pressed to the seat face during valve closing when the driving of the electric motor is stopped.
1 . An electronically controlled regulator, comprising:
a body formed with an introduction port and a discharge port;
a pressure regulating valve disposed inside the body;
an electric motor disposed inside the body;
a pressure sensor detecting a value of a discharge pressure;
a driver that drives and controls the electric motor based on the value of the discharge pressure;
the pressure regulating valve including:
a valve shaft that is coaxially disposed with a valve body and is able to reciprocate in an axial direction;
a valve seat having a seat face capable of being in close contact with the valve body on a side of a high-pressure fluid chamber following the introduction port; and
a discharge pressure regulating unit that regulates a pressure of a fluid by causing the valve shaft to reciprocate through driving of the electric motor electronically controlled to change a distance between the valve body and the valve seat, a high-pressure fluid introduced from the introduction port into the high-pressure fluid chamber being discharged from the discharge port as a depressurized fluid at a set pressure on a side of a discharge pressure chamber while being depressurized and regulated by the pressure regulating valve;
a valve shaft moving structure configured as a feed screw mechanism including:
a trapezoidal male screw formed on an outer peripheral face of a columnar motion shaft disposed on a distal end side of the valve shaft; and
a trapezoidal female screw formed on an inner peripheral face of a rotor that is a cylindrical member constituting a part of the electric motor and meshing with the trapezoidal male screw, the trapezoidal female screw integrated with the inner peripheral face side of the rotor and rotatable around the trapezoidal male screw via the electric motor;
wherein a cylindrical space is formed on the side of the discharge pressure chamber;
wherein a piston receiving a fluid pressure in the discharge pressure chamber is slidably arranged in the cylindrical space together with the valve shaft in a state where the piston is fixed to an outer peripheral side of the valve shaft; and
wherein the fluid pressure received by the piston is converted into a pressure load in a direction where the valve body is pressed to the seat face during valve closing when the driving of the electric motor is stopped.
2 . The electronically controlled regulator according to claim 1 , wherein:
an outer peripheral seal diameter of the piston is larger than a seat diameter of the valve seat; and
a pressure load obtained by subtracting a pressure receiving area defined by the seat diameter from a pressure receiving area defined by the outer peripheral seal diameter acts as the pressure load in the direction where the valve body is pressed to the seat face.
3 . The electronically controlled regulator according to claim 1 , wherein the piston is integrated with the valve shaft on an inner peripheral side of the piston via at least one of adhesion and welding.
4 . The electronically controlled regulator according to claim 1 , wherein the piston is disposed separately from the valve shaft.
5 . The electronically controlled regulator according to claim 2 , wherein the piston is integrated with the valve shaft on an inner peripheral side of the piston via at least one of adhesion and welding.
6 . The electronically controlled regulator according to claim 2 , wherein the piston is disposed separately from the valve shaft.
7 . An electronically controlled regulator, comprising:
a body formed with an introduction port and a discharge port;
a pressure regulating valve disposed inside the body;
an electric motor disposed inside the body;
the pressure regulating valve including:
a valve shaft that is coaxially disposed with a valve body and is able to reciprocate in an axial direction;
a valve seat having a seat face capable of being in close contact with the valve body on a side of a high-pressure fluid chamber following the introduction port; and
a discharge pressure regulating unit that regulates a pressure of a fluid by causing the valve shaft to reciprocate through driving of the electric motor electronically controlled to change a distance between the valve body and the valve seat, a high-pressure fluid introduced from the introduction port into the high-pressure fluid chamber being discharged from the discharge port as a depressurized fluid at a set pressure on a side of a discharge pressure chamber while being depressurized and regulated by the pressure regulating valve;
a valve shaft moving structure coupled to the electric motor and to the valve shaft, the valve shaft moving structure configured to convert rotary motion provided by the electric motor into linear motion of the valve shaft;
wherein a cylindrical space is formed on the side of the discharge pressure chamber;
wherein a piston receiving a fluid pressure in the discharge pressure chamber is slidably arranged in the cylindrical space together with the valve shaft in a state where the piston is fixed to an outer peripheral side of the valve shaft; and
wherein the fluid pressure received by the piston is converted into a pressure load in a direction where the valve body is pressed to the seat face during valve closing when the driving of the electric motor is stopped.
8 . The electronically controlled regulator according to claim 7 , wherein the valve shaft moving structure is a feed screw mechanism.
9 . The electronically controlled regulator according to claim 8 , wherein the feed screw mechanism includes:
a female screw portion coupled to a rotor of the electric motor, the female screw portion rotatable via the electric motor; and
a male screw portion coupled to the valve shaft, the male screw portion engaged with the female screw portion such that rotation of the female screw portion linearly moves the valve shaft and the valve body with respect to the valve seat.