摘要:
In an electronic blackboard, a print head for drawing an image on the screen sheet is disposed on the upstream side of a read head for reading an image from the screen sheet, with respect to the forward travel direction of the screen sheet. When an image is printed on the screen sheet, the screen sheet is moved in the reverse travel direction. When the read head reads an image on the screen sheet, print stop processing is performed in order to stop printing operation of the print head. If an unerased image is present on the stored face of the screen sheet when printing on the screen sheet is performed, the unerased image on the stored face passes by the read head, because the screen sheet is moved in the reverse travel direction during such a printing operation. If the read head reads an unerased image, the print stop processing is performed in order to stop printing operation of the print head, and warning display processing is performed in order to display a message indicating that an unerased image is present on the screen sheet.
摘要:
A heat exchanger (1) on the secondary heat source, which exchanges heat with a heat exchanger (12) on the primary heat source in a primary cooling circuit (A), is connected with an indoor heat exchanger (3) through a gas pipe (6) and a liquid pipe (7). A tank (T) storing a liquid cooling medium is connected at its lower end to the liquid pipe (7) and its upper end to a pressure adjustment mechanism (18). Check valves (CV1 and CV2) are disposed on both sides of the connecting point of the tank (T) with respect to the liquid pipe (7). The internal pressure of the tank (T) is changed over alternately between a high pressure state and a low pressure state by the pressure adjustment mechanism (18) so that the liquid cooling medium is supplied to the indoor heat exchanger (3) at the time of the high pressure operation, and the liquid cooling medium is recovered from the heat exchanger (1) on the secondary side to the tank (T) and is circulated by a secondary cooling circuit (B) at the time of the low pressure operation.
摘要:
An air conditioner includes a refrigerant circuit that includes a heat source heat exchanger configured such that refrigerant flows in from below and flows out from above when the heat source heat exchanger functions as an evaporator of the refrigerant and a plurality of utilization heat exchangers. When the heat source heat exchanger is caused to function as an evaporator, the refrigerant discharged from a compression mechanism is bypassed to an intake side of the compression mechanism via a first bypass circuit, the heat source heat exchanger is caused to function as a condenser, and an expansion valve is closed, whereby refrigerating machine oil accumulating inside the heat source heat exchanger is returned to the intake side of the compression mechanism from a lower portion of the heat source heat exchanger via an oil returning circuit.
摘要:
A refrigeration system to increase the subcooling degree of refrigerant flowing through a main refrigerant circuit is provided. The refrigeration system is configured such that a portion of the refrigerant flowing through the main refrigerant circuit can be made to bypass the remainder of the main refrigerant circuit in a bypass refrigerant circuit so as to be returned to the intake side of a compressor and to be used to cool the refrigerant flowing through the main refrigerant circuit to a subcooled state.
摘要:
A heat exchanger (1) on the secondary heat source, which exchanges heat with a heat exchanger (12) on the primary heat source in a primary cooling circuit (A), is connected with an indoor heat exchanger (3) through a gas pipe (6) and a liquid pipe (7), which are provided with solenoid valves (SV1, SV2), respectively. Only the solenoid valve (SV2) of the liquid pipe (7) is opened at the time of heat radiation of the heat exchanger (12) on the primary side and the liquid cooling medium is supplied from the heat exchanger (1) on the secondary side to the indoor heat exchanger (3) by the high vapor pressure of the cooling medium evaporated from the heat exchanger (1). Only the solenoid valve (SV1) of the gas pipe (6) is opened at the time of heat absorption of the heat exchanger (12) and the gas cooling medium is recovered from the indoor heat exchanger (3) to the heat exchanger (1) by the low vapor pressure of the cooling medium condensed by the heat exchanger (1).
摘要:
The present invention provides an oil equalizing circuit that can improve the reliability of the oil supply to the compression mechanisms in a refrigeration system provided with a plurality of compression mechanisms. The compressor group of the air conditioning system is equipped chiefly with first, second, and third compressors and an oil equalizing circuit. The oil equalizing circuit is equipped with the first, second and third oil separators provided on the discharge sides of the compressors; first, second, and third oil return pipes connecting the oil separators to the intake sides of the compressors; a communication pipe for allowing the oil return pipes to communicate with one another; first, second, and third oil ON-OFF switching mechanisms provided downstream of the parts where the oil return pipes connect to the communication pipe; and first, second, and third pressure reducing mechanisms provided upstream of the parts where the oil return pipes connect to the communication pipe.
摘要:
An air conditioner (1) including a heat source side heat exchanger (23) constructed such that, when it functions as the evaporator for a refrigerant, the refrigerant flows in from the lower side and flows out from the upper side and having a refrigerant circuit (12) capable of switching to cause the heat source side heat exchanger (23) and use side heat exchangers (32, 42, 52) to function individually as the evaporator or the condenser for the refrigerant. The range of control when evaporation ability of the heat source side heat exchanger (23) is controlled by a heat source side expansion valve (24) is expanded. When the heat source side heat exchanger (23) is operated to function as the evaporator, the air conditioner (1) causes the refrigerant discharged from a compression mechanism (21) through a first bypass circuit (102) to bypass to the suction side of the compression mechanism (21), switches the heat source side heat exchanger (23) to operation in which it functions as the condenser, and closes the heat source side expansion valve (24). By this, a freezing machine oil collected in the heat source side heat exchanger (23) through a first oil return circuit (101) is returned to the suction side of the compression mechanism (21) from the lower part of the heat source side heat exchanger (23).
摘要:
The present invention is capable of eliminating the line unit in an air conditioner that includes a plurality of heat source units, and hold increases in onsite line construction to a minimum while making it possible to adjust the amount of refrigerant in the air conditioner. The air conditioner includes a plurality of heat source units, a refrigerant liquid junction line and a refrigerant gas junction line, user units, and a refrigerant supply circuit. The refrigerant supply circuit is used in situations in which some of the plurality of heat source units stop operating in response to the operational burden of the user units, and is formed from refrigerant removal lines that remove refrigerant that accumulates inside stopped heat source units to the exterior thereof, and an oil equalization line and oil removal lines that connect the refrigerant removal lines of each stopped heat source unit and the intake sides of the compression mechanisms of the operating heat source units.
摘要:
A refrigeration system to increase the subcooling degree of refrigerant flowing through a main refrigerant circuit is provided. The refrigeration system is configured such that a portion of the refrigerant flowing through the main refrigerant circuit can be made to bypass the remainder of the main refrigerant circuit in a bypass refrigerant circuit so as to be returned to the intake side of a compressor and to be used to cool the refrigerant flowing through the main refrigerant circuit to a subcooled state.
摘要:
The present invention is capable of eliminating the line unit in an air conditioner that includes a plurality of heat source units, and hold increases in onsite line construction to a minimum while making it possible to adjust the amount of refrigerant in the air conditioner. The air conditioner includes a plurality of heat source units, a refrigerant liquid junction line and a refrigerant gas junction line, user units, and a refrigerant supply circuit. The refrigerant supply circuit is used in situations in which some of the plurality of heat source units stop operating in response to the operational burden of the user units, and is formed from refrigerant removal lines that remove refrigerant that accumulates inside stopped heat source units to the exterior thereof, and an oil equalization line and oil removal lines that connect the refrigerant removal lines of each stopped heat source unit and the intake sides of the compression mechanisms of the operating heat source units.