1. An actuator comprising:
one or more drive devices, each being configured to linearly move a movable member, wherein each of the drive device includes a guide member extending along a moving direction of the movable member, the movable member being inserted into the guide member;
a partition member provided next to the movable member and configured to partition a space defined between the movable member and a control device for controlling the drive devices; and
a fan arranged on the side of the movable member with respect to the partition member and configured to flow an air existing in a partitioned space on the side of the movable member with respect to the partition member, and
a frame defining a space enclosing the guide member together with the fan and the partition member, the frame being provided with an opening formed at the opposite side of the guide member from the partition member.
2. The actuator of claim 1,
wherein guide members of the drive devices are arranged side by side, and
wherein the fan has an axis substantially parallel to an arranging direction of the guide members, and the axis of the fan is arranged closer to the partition member than the axes of the guide members.
3. The actuator of claim 2, wherein the guide members are arranged at a regular interval.
4. The actuator of claim 2, wherein the guide members are arranged such that an interval between the neighboring guide members distanced farther from the fan is larger than an interval between the neighboring guide members distanced closer to the fan.
5. The actuator of claim 2, wherein each of the guide members is a tubular member having an inner circumferential surface, and
wherein a tubular coil is arranged on the inner circumferential surface, the movable member being provided with a permanent magnet opposite to the coil.
6. The actuator of claim 3, wherein each of the guide members is a tubular member having an inner circumferential surface, and
wherein a tubular coil is arranged on the inner circumferential surface, the movable member being provided with a permanent magnet opposite to the coil.
7. The actuator of claim 4, wherein each of the guide members is a tubular member having an inner circumferential surface, and
wherein a tubular coil is arranged on the inner circumferential surface, the movable member being provided with a permanent magnet opposite to the coil.
8. An actuator comprising:
one or more drive devices, each being configured to linearly move a movable member;
a partition member provided next to the movable member and configured to partition a space defined between the movable member and a control device for controlling the drive devices; and
a fan arranged on the side of the movable member with respect to the partition member and configured to flow an air existing in a partitioned space on the side of the movable member with respect to the partition member,
wherein each of the drive devices includes a guide member extending along a moving direction of the movable member, the movable member being inserted into the guide member,
wherein guide members of the drive devices are arranged side by side,
wherein the fan has an axis substantially parallel to an arranging direction of the guide members, and the axis of the fan is arranged closer to the partition member than the axes of the guide members,
wherein each of the guide members is a tubular member having an inner circumferential surface,
wherein a tubular coil is arranged on the inner circumferential surface, the movable member being provided with a permanent magnet opposite to the coil, and
wherein each of the guide members includes a protruding portion for defining a space between the coil and the inner circumferential surface, the protruding portion protruding toward the partition member.
9. The actuator of claim 1, wherein the partition member includes a heat dissipating portion for dissipating heat.
10. The actuator of claim 2, wherein the partition member includes a heat dissipating portion for dissipating heat.
11. The actuator of claim 3, wherein the partition member includes a heat dissipating portion for dissipating heat.
12. The actuator of claim 4, wherein the partition member includes a heat dissipating portion for dissipating heat.
13. An actuator cooling method, comprising:
partitioning a space between a control device and a linearly movable member with a partition member, the control device being configured to control a drive device including the movable member and a guide member extending along a moving direction of the movable member, the movable member being inserted into the guide member;
defining a space enclosing the guide member with the partition member, a fan arranged on the side of the movable member with respect to the partition member, and a frame provided with an opening formed at the opposite side of the guide member from the partition member; and
flowing an air existing in the space enclosing the guide member by using the fan.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for controlling coke morphology in a delayed coking process that comprises:
(a) heating a coker feedstock in a heater to produce a heated feedstock,
(b) conducting the heated feedstock to a coker vessel,
(c) maintaining the coker vessel at delayed coking temperatures at effective delayed coking conditions to produce vapor products and coke,
(d) quenching the coker vessel, and
(e) subjecting at least one of steps (a), (b), or (c) to acoustic energy at an energy level and for a time sufficient to produce shot coke.
2. A method for controlling foam formation in a delayed coking process that comprises:
(a) heating a coker feedstock in a heater to produce a heated feedstock,
(b) conducting the heated feedstock to a coker vessel,
(c) maintaining the coker vessel at delayed coking temperatures at effective delayed coking conditions to produce foam, vapor products and coke, and
(d) subjecting the coker vessel in step (c) to acoustic energy at an energy level and for a time sufficient to reduce the amount of foam.
3. The methods of claims 1 or 2 wherein the feedstock is heated to temperatures of about 480\xb0 C. to about 520\xb0 C. in at least one furnace containing at least one furnace tube and is transferred to the coker vessel through at least one transfer line.
4. The method of claims 1 or 2 wherein the coke formed is a sponge coke, shot coke or mixture thereof.
5. The method of claim 4 wherein the coke is a shot coke.
6. The method of claim 2 wherein at least one anti-foam agent is added to the coker vessel.
7. The method of claim 3 wherein acoustic energy is applied to at least one of the coker drum, furnace tube or transfer line.
8. The method of claims 1 or 2 wherein the acoustic energy is applied axially along the length of the coker vessel, across the diameter of the coker vessel or at some angle between axial and perpendicular to axial.
9. The method of claims 1 or 2 wherein the acoustic energy is in a frequency range from about 15 to about 20,000 Hz.
10. The method of claims 1 or 2 wherein the acoustic energy is in the range from about 90 to about 200 dB.
11. The method of claims 1 or 2 wherein the acoustic energy is in the form of a standing wave.
12. The method of claim 4 further comprising at least one metal-containing additive.