JPH0754775Y2 - Non-condensable gas discharge device for absorption refrigerator - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a non-condensable gas discharge device for an absorption refrigerator, and more particularly to a non-condensed gas discharge device for an absorption refrigerator, which is suitable for saving ejector driving water. It is a thing.

[Prior art]

An absorption refrigerator is a regenerator that heats a solution consisting of a refrigerant and an absorbent to produce refrigerant vapor, a condenser that condenses the refrigerant vapor, an evaporator that evaporates the condensed refrigerant, and a solution that evaporates the refrigerant. It is composed of an absorber that absorbs. The absorption chiller is provided with a non-condensable gas discharge device that discharges the non-condensable gas (mainly hydrogen gas) that is generated in the regenerator and causes a reduction in refrigerating capacity to the outside of the machine. Hereinafter, the non-condensable gas is abbreviated as gas.

A conventional non-condensable gas discharge device is disclosed in Japanese Patent Application No. 63-104722, and as shown in FIG. 7, when the gas pressure in the gas storage tank 1 rises and reaches the upper limit set pressure of the pressure switch 7, The electromagnetic valve 3 that opens and closes the drive water of the ejector 5 is opened by the signal output from the pressure switch 7. Ejector 5
The gas in the storage tank was sucked by the ejector 5 through the exhaust pipe 8 via the ball check valve 21 and discharged to the outside of the machine.

[Problems to be solved by the device]

In the prior art as described above, when the flow rate of the driving water for the ejector is low or the temperature of the driving water is high, the required vacuum degree cannot be formed on the ejector intake side, and the pressure switch of the storage tank is not formed. The off set pressure of may not be reached easily. In such a case, the driving water will continue to flow unnecessarily. Further, in the prior art, it is disclosed that the valve of the driving water is opened and closed by a timed operation instead of the pressure switch, but in practice, it is difficult to accurately set the time to open the valve and the time to drive the ejector. However, there are problems such as starting the ejector drive even if the storage tank is not full of gas, or continuing to drive the ejector even after the gas is exhausted.

The present invention has been made to solve the above problems, and an object thereof is to provide a non-condensable gas discharge device for an absorption refrigerating machine which has a simple structure and can prevent waste of ejector driving water and has a highly reliable function. To do.

[Means for Solving the Problems]

In order to achieve the above object, the present invention opens and closes a solenoid valve based on an output signal of a pressure switch that detects the pressure in a storage tank of noncondensable gas generated in a regenerator of an absorption refrigerator, and the solenoid valve is opened and closed. In a non-condensable gas discharge device of a suction type refrigerator for driving an ejector by driving water flowing through the storage tank to discharge the non-condensable gas in the storage tank, start timing in response to an output signal of the pressure switch, A timer that outputs a signal after a predetermined time has elapsed from the start of timing,
Means for controlling the closing of the solenoid valve according to the output signal of the timer.

Further, in the non-condensable gas discharge device of the absorption refrigerator as described above, the timer, the driving water temperature sensor and the flow velocity sensor, the driving water temperature and the flow velocity are read to calculate the ejector driving time, and the timer time is set. It is characterized by having a CPU for processing.

[Action]

When gas accumulates in the gas storage tank and the pressure rises, the pressure switch outputs a signal, and the signal starts a timer to control the opening and closing time of the electromagnetic valve of the ejector driving water. Therefore, even if the drive water continues to flow because the ejector operating pressure difference cannot be made and the gas discharge capacity is low due to causes such as a decrease in the flow rate of the drive water and a rise in the temperature of the drive water, and the pressure switch OFF set pressure is not reached. By the output signal of the timer that sets the time, the solenoid valve can be closed to stop the driving water reliably. In this way, useless outflow of the ejector driving water can be prevented.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a non-condensable gas discharge device of an absorption refrigerator according to a first embodiment of the present invention. The gas discharged from the absorption refrigerator main body 30 descends through the pipe 12, is separated into the gas and the solution by the non-condensable gas separator 11, the solution returns to the refrigerator 30 through the pipe 13, and the gas is supplied through the pipe 14. Is collected and collected in the gas storage tank 1. When the storage tank 1 is filled with gas and reaches the ON set pressure of the pressure switch 7, the output signal thereof starts the timer 17 to open the solenoid valve 3 to drive the ejector 5 from the water chamber 4 through the pipe line 16 to drive water. Introduce. When the ejector 5 operates in this way, a negative pressure is generated on the intake side of the ejector 5, and the ball valve 21 of the differential pressure on-off valve 9 connected thereto floats up, so that the gas in the storage tank 1 is sucked through the pipe line 8. It is discharged and discharged from the ejector 5 to the outside. Storage tank 1
When the gas inside is reduced and the internal pressure becomes equal to or lower than the OFF set pressure of the pressure switch 7, a signal is output and the solenoid valve 3 is closed to stop the driving water. If the set time of the timer 17 elapses before the internal pressure of the storage tank 1 drops to the off set pressure of the pressure switch 7, the solenoid valve 3 is closed by the output signal from the timer 17. In addition, 10 is a manual valve and 22 is a spring.

In such operation, as shown in the controller block diagram of FIG. 2, the CPU (microprocessor) processes the output signals of the operation switch, the pressure switch, and the timer through the interface, and the operation signal is output through the interface. The solenoid valve is operating. FIG. 3 shows a flow chart of the first embodiment as described above. Here, P _G is the pressure inside the storage tank, P ₁ is the pressure switch-on set pressure, and P ₂ is the pressure switch-off set pressure. FIG. 4 is a partial circuit diagram of the first embodiment, in which a pressure switch 7 (PS), a timer 17 (T),
The circuit structure of the ejector drive water solenoid valve 3 (SV) is shown.

Next, a second embodiment of the present invention is shown in the controller block diagram of FIG. 5 and the flowchart of FIG. In the second embodiment, the temperature of the driving water and the flow velocity of the driving water are detected every time the gas is discharged, and the CPU reads and calculates these values for optimum setting. Although not shown, the temperature sensor was provided in the water chamber 4, and the flow rate sensor was provided in the driving water pipe line 16.

Exhaust volume per unit time of the ejector Q _V is the drive water temperature T _E
And the flow velocity V _{E of the} driving water have the relationship of equation (1).

The optimum set time t of the timer is obtained from the equation (2) for the gas storage amount Q of the storage tank.

Thus, by detecting the temperature and the water flow velocity of the water when the ejector is driven and inputting it to the CPU, the optimum set time is calculated, and the value is input to the timer.

As shown in the flow chart of FIG. 6, when the internal pressure of the storage tank 1 exceeds the ON set pressure of the pressure switch 7, the solenoid valve 3 opens, and the CPU immediately reads the temperature and flow velocity of the driving water and calculates the optimum set time. , The timer 17 is set to start timing, and when the internal pressure of the storage tank 1 becomes lower than the OFF set pressure of the pressure switch 7 or when the set time of the timer 17 elapses, the solenoid valve 3 is closed and the ejector 5 is operated. Is stopped and the timer 17 is reset.

[Effect of device]

According to the present invention, a timer is provided in the drive water solenoid valve circuit of the gas discharge ejector of the non-condensing gas storage tank of the absorption refrigerator, and the drive water temperature and the drive water flow rate are read to calculate the optimum set time of the timer. Since the CPU for processing is installed and the timer is activated, even if the ejector's capacity declines due to the flow rate and temperature conditions of the driving water and a difference in operating pressure does not occur and the outflow of driving water does not stop, the timer is driven at the set time. The water solenoid valve can be closed reliably.

Further, the ejector drive time can be easily set by changing the set time of the timer without depending on the off set pressure of the pressure switch. In this way, waste of the ejector driving water can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram of a non-condensable gas discharge device for an absorption refrigerator according to an embodiment of the present invention, FIG. 2 is a controller block diagram of the first embodiment according to the present invention, and FIG. 3 is a flow chart of the first embodiment. FIG. 4 is a partial circuit diagram of the first embodiment, FIG. 5 is a controller block diagram of the second embodiment according to the present invention,
FIG. 6 is a flow chart of the second embodiment, and FIG. 7 is a block diagram of a conventional gas exhaust system. 1 ... Storage tank, 3 ... Solenoid valve, 5 ... Ejector, 7
... Pressure switch, 9 ... Differential pressure open / close valve, 17 ... Timer, 30 ... Absorption refrigerator.

Claims (2)

[Scope of utility model registration request] 1. A solenoid valve is opened and closed based on an output signal of a pressure switch for detecting the pressure in a storage tank of non-condensable gas generated in a regenerator of an absorption chiller, and drive water flowing through the solenoid valve is used. In a non-condensable gas discharge device of a suction type refrigerator that drives an ejector to discharge the non-condensed gas in the storage tank, a time measurement is started according to an output signal of the pressure switch, and a predetermined time has elapsed from the start of the time measurement. A non-condensable gas discharge device for a suction type refrigerator, comprising: a timer for outputting a signal; and means for controlling the electromagnetic valve to be closed according to the output signal of the timer. 2. A solenoid valve is opened / closed based on an output signal of a pressure switch for detecting the pressure in the storage tank of the non-condensed gas generated in the regenerator of the absorption refrigerator, and the driving water flowing through the solenoid valve is used. In a non-condensable gas discharge device of a suction type refrigerator that drives an ejector to discharge the non-condensed gas in the storage tank, a time measurement is started according to an output signal of the pressure switch, and a set time elapses from the start of the time measurement. A timer that outputs a signal later, a temperature sensor that detects the temperature of the driving water, a flow velocity sensor that detects the flow velocity of the driving water, and a set time of the timer based on detection signals of the temperature sensor and the flow velocity sensor. And a CPU that controls the operation of the timer at the calculated set time, and the CPU controls to close the solenoid valve according to the output signal of the timer. Noncondensable gas discharge device for suction-type refrigerator, characterized in that.