1. An image forming apparatus comprising:
a recording head having nozzles to eject liquid droplets;
a liquid tank detachably mounted to the image forming apparatus to store liquid to be supplied to the recording head;
a first passage connected to the recording head to supply the liquid to the recording head;
a second passage connected to the liquid tank;
a pressure unit disposed at the second passage to apply pressure to liquid in the second passage; and
a control valve disposed between the first passage and the second passage to control supply of the liquid from the second passage to the first passage,
the control valve including
an outflow port communicated with the first passage,
an inflow port communicated with the second passage,
an internal channel to connect the first passage and the second passage,
an expandable liquid retaining chamber connected to the internal channel to retain the liquid, and
a valve member disposed in the internal channel to open and close the first passage and the second passage and movable by a flow of liquid from the liquid retaining chamber to the first passage created by ejection of liquid from the recording head to communicate the second passage with the first passage,
wherein a capacity of the expandable liquid retaining chamber is reduced by ejection of the liquid droplets from the recording head, and
wherein the valve member is disposed within the internal channel, with a clearance between the valve member and the internal channel,
the valve member is configured to be reciprocally movable to close the outflow port and to close the inflow port, and
movement of the valve member to a position at which the valve member does not close any of the outflow port and the inflow port creates a flow of the liquid from the inflow port to the outflow port via the clearance.
2. The image forming apparatus according to claim 1, further comprising a third passage connecting the first passage to one of the second passage and the liquid tank.
3. The image forming apparatus according to claim 2, further comprising a regulator disposed in the third passage to regulate a flow of liquid from the first passage to the one of the second passage and the liquid tank.
4. The image forming apparatus according to claim 3, wherein the regulator is a check valve to open and close in accordance with an amount of the liquid flowing from the first passage.
5. The image forming apparatus according to claim 1, further comprising a through-hole formed in the valve member to Communicate the first passage with the liquid retaining chamber.
6. The image forming apparatus according to claim 5, further comprising a seal member formed in the control valve to close the through-hole in contact with the valve member when the valve member is moved toward the first passage.
7. The image forming apparatus according to claim 1, wherein the liquid retaining chamber comprises a flexible member.
8. The image forming apparatus according to claim 7, further comprising an urging member disposed in the liquid retaining chamber to urge the flexible member in a direction to expand the liquid retaining chamber.
9. The image forming apparatus according to claim 8, wherein the urging member is a compression spring.
10. The image forming apparatus according to claim 1, wherein the liquid retaining chamber comprises an elastic member.
11. The image forming apparatus according to claim 1, further comprising a sliding portion formed on an outer circumferential portion of the valve member and slidable over an inner wall surface of the internal channel of the control valve.
12. The image forming apparatus according to claim 1, wherein movement of the valve member toward the first passage increases a width of flow of the liquid in the internal channel between the first passage and the liquid retaining chamber.
13. The image forming apparatus according to claim 1, further comprising a spring disposed in the control valve to urge the valve member toward the second passage.
14. The image forming apparatus according to claim 1, wherein the pressure unit generates pulsating pressure.
15. The image forming apparatus according to claim 1, wherein the inflow port and the outflow port are disposed at respective ends of the internal channel of the control valve, and the expandable liquid retaining chamber is disposed at a side of the internal channel that is more proximal to the inflow port than to the outflow port.
16. The image forming apparatus according to claim 1, wherein the clearance is formed between an outer circumference of the valve member and the internal channel.
17. The image forming apparatus according to claim 1, wherein the expandable liquid retaining chamber is communicated with the internal channel via one or more communication channels disposed in the valve member, and the communication channels have a diameter smaller than a diameter of each of the inflow port and the outflow port.
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 container data center system, comprising:
a container defining a first receiving room and a second receiving room isolated from the first receiving room;
a plurality of servers received in the first receiving room;
at least a regulation device received in the second receiving room, the at least regulation device being electrically connected to the servers for regulating the servers;
a first refrigeration device installed outside the container for cooling the first receiving room; and
a second refrigeration device installed outside the container for cooling the second receiving room.
2. The container data center system of claim 1, further comprising a first temperature sensor measuring a first temperature of the first receiving room, a second temperature sensor measuring a second temperature of the second receiving room, and a third temperature sensor measuring a outdoor temperature of the outside of container.
3. The container data center system of claim 2, further comprising a control center electrically connected to the first refrigeration device, the second refrigeration device, the first temperature sensor, the second temperature sensor, and the third temperature sensor; wherein the control center comprises a memory module, a data obtaining module, a comparison module, and a control module, the memory module stores a first temperature threshold and a second temperature threshold, the data obtaining module is configured to obtain the first temperature, the second temperature, and the outdoor temperature, the comparison module is configured to compare if the first temperature is greater than the first temperature threshold and if the outdoor temperature is greater than the first temperature threshold, the control module is configured to turn on the first refrigeration device to generate cool air to the first receiving room when the first temperature and the outdoor temperature are both greater than the first temperature threshold.
4. The container data center system of claim 3, further comprising a first airflow guide pipe, wherein the first airflow guide pipe is partially mounted in the first receiving room, the first airflow guide pipe is a hollow quadrangular frustum pyramid and comprises four planar side plates sequentially connected with each other, each side plate is isosceles trapezoid, one of the side plates defines a trapezoid air outlet, a plurality of air leading plates mounted in the air outlet, each air leading plate is parallel to the others and form an acute angle relative to the side plate defining the air outlet, the first airflow guide pipe comprises a first front end positioned outside the container and a first rear end, the first airflow guide pipe is tapered from the first front end to the first rear end, the first refrigeration device is connected to the first front end.
5. The container data center system of claim 4, wherein the first refrigeration device comprises a first airflow transmission pipe and a first control switch, the first transmitting pipe is aligned with the first front end, the first control switch is mounted between the first airflow transmission pipe and the first front end, the control module is configured to control the first control switch to connect the first airflow transmission pipe to the first front end when the first temperature and the outdoor temperature are both greater than the first temperature threshold.
6. The container data center system of claim 5, wherein the control module is configured to control the first control switch to disconnect the first airflow transmission pipe from the first front end when the first temperature is greater than the first temperature threshold and the outdoor temperature is lower than the first temperature, the first receive room is communicated with the outside of the container through the first airflow guide pipe when the first airflow transmission pipe disconnects from the first front end.
7. The container data center system of claim 5, wherein the first control switch is an electromagnetic relay.
8. The container data center system of claim 4, further comprising a second airflow guide pipe, wherein the second airflow guide pipe is partially mounted in the second receiving room, the second airflow guide pipe comprises a second front end positioned outside the container and a second rear end, the second airflow guide pipe is tapered from the second front end to the second rear end, the second refrigeration device comprises a second airflow transmission pipe and a second control switch, the second airflow transmission pipe is aligned with the second front end, the second control switch is mounted between the second airflow transmission pipe and the second front end, the control module is configured to control the second control switch to connect the second airflow transmission pipe to the second front end when the second temperature and the outdoor temperature are both greater than the second temperature threshold.
9. The container data center system of claim 8, wherein the control module is configured to control the second control switch to disconnect the second airflow transmission pipe from the second front end when the second temperature is greater than the second temperature threshold and the outdoor temperature is lower than the second temperature, the second receive room is communicated with the outside of the container through the second airflow guide pipe when the second airflow transmission pipe disconnects from the second front end.
10. The container data center system of claim 9, wherein the second control switch is an electromagnetic relay.
11. The container data center system of claim 1, wherein the first refrigeration device and the second refrigeration device are air conditioners.