摘要:
An integral receiver/dehydrator and expansion valve is disclosed in an automotive air conditioning system. A common housing comprises a receiver/dehydrator container surmounted by a connector body in a unitary construction. An electronically controlled expansion valve is disposed in an axial passage in the connector body and a valve chamber in the body connects the draw tube of the receiver/dehydrator to the valve orifice. An annular groove in the common wall between the connector body and the receiver/dehydrator container is connected by a radial passage through the body with the suction line of the receiver/dehydrator from the condenser. An annular chamber surrounding the valve outlet port is connected by a radial passage to the suction line of the evaporator. The radial passages may be disposed at any desired angle on the body to accommodate the connection of the receiver/dehydrator suction line and the evaporation suction line.
摘要:
A refrigeration system including a solenoid actuated on-off modulated expansion valve and a controller for controlling the expansion valve is disclosed. The controller includes a low ambient start-up means responsive to the presence of liquid refrigerant at the inlet end of the expansion valve for overriding normal operations of the valve and maintaining the expansion valve open for refrigerant flow therethrough when liquid refrigerant is not present at the expansion valve. The low ambient start-up means includes temperature sensors upstream and downstream from the expansion valve to detect the temperature differential across the expansion valve. The temperature differential is compared to a threshold value and depending upon the comparison, either overrides the expansion valve to permit full flow therethrough or to allow the expansion valve to operate in response to the controller.
摘要:
A pulsed controlled solenoid flow control valve suitable for use in a closed vapor cycle air conditioning system is disclosed. A pulsewidth modulated control signal is generated for cyclically opening and closing the flow through the expansion valve. The duty cycle of the pulsed control signal determines the average flow rate through the valve. An exponential response control curve is used in conjunction with an integrator offset to obtain a single set point control operating point for all flow rates through the valve, where a given change in the second superheat of the evaporator produces the same percentage change in flow rate regardless of the flow rate.
摘要:
An automotive air conditioning system including an electrically operated expansion valve controlling refrigerant flow to the evaporator. The valve is pressure balanced and provides a minimum flow even when the valve is fully closed. The valve includes a solenoid operator which is energized in a pulse width modulated fashion.
摘要:
A controlled space is maintained at a desired set point temperature by adjusting the refrigerant temperature at the evaporator outlet in a refrigeration system, thereby controlling the evaporator effectiveness or capacity which is inversely proportional to the outlet temperature. When the space temperature tends to vary from the desired set point due to a changing heat load, the control system automatically changes the refrigerant flow through the evaporator to establish the evaporator outlet temperature at the control point required to maintain the controlled space at the desired temperature. More specifically, in response to a space temperature increase, the flow rate of the refrigerant increases; and in response to a drop below the set point, the refrigerant flow decreases. Such control of the flow rate is achieved by varying the actuation of an electromechanical valve, such as a solenoid valve, interposed between the condenser and evaporator in the refrigeration system, the valve also serving as the system's expansion device. When the heat load on the evaporator is constant, the refrigerant flow is controlled in order to hold the evaporator outlet temperature fixed at the required control point.
摘要:
This invention relates to a system and apparatus for electronic control of an absorption refrigeration machine. The flow of liquids within the machine, as well as the concentration of the refrigerant/absorbent mixture solution are precisely controlled through the use of solenoid valves. These solenoids are controlled via a microprocessor control system with various sensors attached, which may include fluid level sensors, pressure sensors, temperature sensors and other environmental data sensors.
摘要:
A cooling system is disclosed. The cooling system may have an evaporator, an evaporator fan, a condenser, and at least one compressor. The compressor may be either a single speed or a variable speed compressor. In addition, the system can use a mechanical or electrical pulsed operation refrigerant flow control valve for controlling refrigerant flow to the evaporator.
摘要:
An object of the present invention is to reduce electrical noise in accordance with the necessity of a countermeasure taken against electrical noise without changing a structure of an expansion valve. In a case where a judgment result as to whether or not the countermeasure against electrical noise is taken is affirmative, a drive timing (interval) of an expansion valve (107) is increased. Further, a driving amount is reduced. Accordingly, a flow of a refrigerant is made slow, whereby it is possible to reduce generated electrical noise while performing instructed temperature control.