WO2019019514A1 - System for automatic gas extraction and discharge - Google Patents

Abstract

A system for automatic gas extraction and discharge, comprising: a gas-discharge chamber (1), a gas-extraction chamber (2) and a gas-liquid separation chamber (3); the gas-discharge chamber (1) is connected by means of a solenoid valve (11, 12) pipeline to a low temperature generator and/or a condenser; the gas-extraction chamber (2) is connected to an absorber by means of a pipeline; the gas-liquid separation chamber (3) is connected to the gas-discharge chamber (1) and the gas-extraction chamber (2) respectively by means of pipelines; the gas-liquid separation chamber (3) is internally provided with a liquid level detecting element (4). The system for automatic gas extraction and discharge enables a non-condensable gas to automatically flow into the gas-discharge chamber (1) by means of a pipeline without needing to add a siphon or an ejector device for forced introduction, and may extract the non-condensable gas inside of a water chamber of the low temperature generator as well as inside of the condenser during non-stop operation without requiring a vacuum pump, thereby greatly reducing costs and simplifying operation.

Description

Automatic exhaust system Technical field

The invention relates to the technical field of air conditioners, in particular to an automatic exhausting and exhausting system.

Background technique

The absorption type lithium bromide cold water chiller generates non-condensable gas (such as hydrogen) during normal operation and when the container leaks air, the vacuum inside the unit is reduced, and the unit output and efficiency are reduced.

In the prior art, the non-condensable gas of the lower body absorber and the evaporator of the main body is usually extracted by siphoning or ejector, but the pressure of the high temperature generator and the low temperature generator is lower than atmospheric pressure, and the non-condensing property thereof is generated. The gas cannot be discharged automatically and can only be extracted by means of a vacuum pump. Due to the large amount of water vapor inside the unit during the operation of the unit, the vacuum pump oil is emulsified seriously, and its ability to evacuate is limited, and the ideal vacuum state cannot be achieved. In particular, high-temperature generators and low-temperature generators have high water vapor partial pressure and high temperature, and the vacuum pump cannot work, and often requires shutdown to perform vacuuming.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic exhaust system which is simple in operation and low in cost, overcoming the above-mentioned deficiencies of the prior art.

The technical solution of the present invention is: an automatic exhausting and exhausting system, comprising an exhaust chamber, a pumping chamber and a gas-liquid separating chamber, wherein the exhaust chamber is connected to a low temperature generator and/or a condenser via a solenoid valve; The gas chamber is connected to the absorber via a pipeline; the gas-liquid separation chamber is respectively connected with the exhaust chamber and the pumping chamber pipeline; and the liquid-liquid detecting chamber is provided with a liquid level detecting element.

The design idea of the above scheme is: when the high temperature generator absorbs heat to generate steam into the water chamber and the heat exchange tube of the low temperature generator, the non-condensable gas (generated or leaked) in the high temperature generator is brought into the steam stream. In the water chamber of the low temperature generator, the gas in the water chamber of the low temperature generator is extracted, which is equivalent to extracting the gas in the high temperature generator. The non-condensable gas on the solution side of the low temperature generator is brought into the condenser along with the vapor stream evaporated by the low temperature generator, and the gas in the extraction condenser is equivalent to the gas in the low temperature generator. Therefore, the technical solution only needs to connect the exhaust chamber to the low temperature generator and/or the condenser, and no need to connect the high temperature generator. The exhaust chamber is connected to the low temperature generator to discharge the high temperature generator together with the non-condensable gas in the low temperature generator; the exhaust chamber is connected to the condenser, and the low temperature generator can be discharged together with the non-condensable gas in the condenser.

In addition, in the normal operation of the absorption type lithium bromide cold water chiller, the internal pressure of the low temperature generator and the internal pressure of the condenser are larger than the pressure of the absorber. With this feature, the non-condensable gas of the low temperature generator or the condenser is introduced into the unit by the pipeline. The exhaust chamber, under the pressure difference, the non-condensable gas will automatically flow into the exhaust chamber through the pipeline.

Therefore, according to the above design concept, the present invention has the following advantages: full use of the inside of the low temperature generator and the internal pressure of the condenser are greater than the pressure of the absorber, so that the non-condensable gas automatically flows into the exhaust chamber through the pipeline, thus, The forced introduction without the need to add a siphon or ejector device not only simplifies the structure but also reduces costs.

Further, the exhaust chamber pipe is connected to an exhaust pump, and the exhaust chamber pipe is connected to the air pump. The air pump can quickly discharge the non-condensable gas in the exhaust chamber; the air pump can quickly discharge the non-condensable gas in the pumping chamber.

Further, the exhaust chamber is connected to the water chamber of the low temperature generator via a solenoid valve, and the pumping chamber is connected to the barrel of the absorber via a pipeline; or the exhaust chamber is connected to the cylinder of the condenser via a solenoid valve to pump air. The chamber is connected to the barrel of the absorber via a pipeline; or the exhaust chamber is connected to the water chamber of the low temperature generator via a solenoid valve, and the exhaust chamber is connected to the barrel of the condenser via another solenoid valve, and the pumping chamber is pipelined Connect the barrel of the absorber.

The solenoid valve is opened by a program or manually for a short time to allow non-condensable gas and part of the water vapor to pass through and enter the exhaust chamber. Immediately close the solenoid valve to avoid excessive water vapor entering the exhaust chamber to damage the pressure balance of other parts of the unit, resulting in abnormal unit operation.

Further, the pumping chamber and the gas-liquid separation chamber are connected by an exhaust pipe, and one end of the suction pipe extends into the gas-liquid separation chamber, and the distance of the suction pipe from the bottom of the gas-liquid separation chamber is smaller than the distance between the liquid level detecting component and the gas-liquid separation chamber. The distance from the bottom. Thus, on the one hand, it is convenient to press the solution into the suction pipe into the suction chamber until the liquid level detecting element detects that the liquid level leaves the probe; on the other hand, the liquid seal is realized.

Further, the air suction pipe is of a siphon type or an ejector type. This makes it easy to pump quickly.

Further, a vacuum valve is disposed between the exhaust chamber and the low temperature generator and/or the condenser to prevent vacuum leakage inside the unit.

Further, the gas-liquid separation chamber is connected to the absorber through a return pipe. In this way, the lithium bromide solution in the gas-liquid separation chamber can be refluxed into the absorber for recycling.

Further, the liquid level detecting element is connected to the controller, and the output end of the controller is connected to the electromagnetic valve, the exhaust pump and the air pump. Through the automatic control of the controller, solenoid valve, exhaust pump and air pump, the non-condensable gas inside the low temperature generator water chamber and the inside of the condenser can be extracted without a vacuum pump, which greatly reduces the cost.

Further, an exhaust valve is further disposed on the exhaust chamber.

Further, an exhaust probe is further disposed on the exhaust chamber.

The invention has the advantages that on the one hand, the inside of the low temperature generator and the internal pressure of the condenser are both larger than the pressure of the absorber, so that the non-condensable gas can automatically flow into the exhaust chamber through the pipeline, so that there is no need to add siphon or The forced introduction of the ejector device not only simplifies the structure but also reduces the cost; on the other hand, through the automatic control of the controller, the solenoid valve, the exhaust pump and the air pump, the inside of the low temperature generator water chamber and the inside of the condenser can be The non-condensable gas is pumped out and no vacuum pump is needed, which greatly reduces the cost.

Since the unit is running, the high temperature generator and the low temperature generator have high temperature and high water vapor pressure. It is not suitable for vacuum pumping (causing vacuum pump oil emulsification or even vacuum pump destruction), nor can it ventilate the unit exhaust chamber and other positions for a long time (causing other The pressure of the part rises, and the evaporation and absorption are stopped. The present invention temporarily opens the electromagnetic valve by program control or manual operation, so that the air is not condensed. The gas and part of the water vapor are discharged into the exhaust chamber, the solenoid valve is closed, and the exhaust of the unit is completed by the exhaust pump. Therefore, it is possible to remove the non-condensable gas of the high temperature generator and the low temperature generator portion in the case of continuous startup operation.

The present invention is compared with a method of extracting a non-condensable gas by a vacuum pump. Because the method of extruding the exhaust gas by the solution, only the non-condensable gas is excluded, and the water vapor, octanol or the like is not extracted by the vacuum pump, and the composition change of the solution is affected.

DRAWINGS

1 is a schematic structural view of an embodiment of the present invention.

Detailed ways

The invention will be further described in detail below in conjunction with the drawings and specific embodiments.

As shown in FIG. 1, an automatic exhaust system includes an exhaust chamber 1, an exhaust chamber 2, and a gas-liquid separation chamber 3. The exhaust chamber 1 is connected to the water chamber of the low temperature generator via a solenoid valve 11 , and the exhaust chamber 1 is connected to the cylinder of the condenser via another electromagnetic valve 12 , and the pumping chamber 2 is connected to the barrel of the absorber via a pipeline. The gas-liquid separation chamber 3 is in communication with the exhaust chamber 1 and the pumping chamber 2, respectively; and the liquid-liquid detecting chamber 3 is provided with a liquid level detecting probe 4. The pumping chamber 2 is connected to the gas-liquid separation chamber 3 through the exhaust pipe 21, and one end of the exhaust pipe 21 extends into the gas-liquid separation chamber 3. The distance between the exhaust pipe 21 and the bottom of the gas-liquid separation chamber 3 is less than the liquid level detection. The distance of the needle 4 from the bottom of the gas-liquid separation chamber 3, one end of the suction pipe 21 extends into the pumping chamber 2, and the suction pipe 21 is a siphon type air pipe. The exhaust chamber 1 and the gas-liquid separation chamber 3 communicate with each other through an exhaust pipe 16.

The exhaust chamber 1 is connected to an exhaust pump 5, and the exhaust chamber 2 is connected to an air pump 6. The gas-liquid separation chamber 3 is connected to the absorber through a return pipe 31.

A manual vacuum valve 13 is also provided between the exhaust chamber 1 and the low temperature generator and the condenser, respectively. An exhaust valve 14 and an exhaust probe 15 are also provided on the exhaust chamber 1. When the pressure in the exhaust chamber 1 is greater than the external pressure, the exhaust valve 14 is automatically opened, and when the pressure in the exhaust chamber is lower than the external pressure, the exhaust valve 14 is automatically closed. The exhaust probe 15 can be used to display the magnitude of the pressure within the exhaust chamber 1.

The liquid level detecting probe 4 is connected to the controller, and the output end of the controller is connected to a solenoid valve, an exhaust pump, and an air pump. In this embodiment, the controller is preferably a PLC controller. The air pump 5 and the exhaust pump 6 are shielded pumps.

In the working principle of the embodiment, by timing the PLC controller, the exhaust system is automatically exhausted intermittently, for example, once every 1 minute. When the exhausting and exhausting time is set, the PLC controller controls the two solenoid valves to open. Since the absorption type lithium bromide cold warm water unit is in normal operation, the internal pressure of the low temperature generator and the internal pressure of the condenser are greater than the pressure of the absorber. A feature is that under the action of the pressure difference, the non-condensable gas from the high temperature generator automatically enters the exhaust chamber through the pipe connected to the low temperature generator, and the non-condensable gas from the low temperature generator automatically enters the exhaust through the pipe connected to the condenser. In the chamber, since the exhaust chamber is in communication with the gas-liquid separation chamber, the non-condensable gas enters the gas-liquid separation chamber through the exhaust pipe, and the lithium bromide solution from the absorber is stored in the gas-liquid separation chamber, and the non-condensable gas is located on the upper side of the solution. The gas-liquid separation chamber is in communication with the pumping chamber, and the solution can be introduced into the pumping chamber; and the pump is always in operation, and the non-condensable gas in the pumping chamber is exhausted through the exhaust pipe. Inhalation of the gas-liquid separation chamber, the non-condensable gas is separated from the liquid, and the non-condensable gas is located on the upper side of the gas-liquid separation chamber. When the gas pressure is increased, the liquid level detecting probe detects that the liquid level leaves the probe, and sends a signal. To the controller, the controller controls the two solenoid valves to close, and quickly starts the exhaust pump to discharge the non-condensable gas out of the unit, that is, the non-condensable gas is discharged through the exhaust valve; when the liquid level detecting probe detects the liquid level, The controller controls the exhaust pump to stop venting.

In summary, the embodiment can fully utilize the characteristics that the internal pressure of the low-temperature generator and the internal pressure of the condenser are larger than the pressure of the absorber, so that the non-condensable gas automatically flows into the exhaust chamber through the pipeline, so that it is not necessary to join. The forced introduction of the siphon or ejector device not only simplifies the structure but also reduces the cost; on the other hand, through the automatic control of the controller, solenoid valve, exhaust pump and air pump, the inside of the low temperature generator water chamber can be condensed The non-condensable gas inside the device is extracted, and no vacuum pump is needed, which greatly reduces the cost.

Claims (10)

An automatic exhausting and exhausting system, comprising: an exhaust chamber, a pumping chamber and a gas-liquid separating chamber, wherein the exhaust chamber is connected to a low temperature generator and/or a condenser via a solenoid valve; the pumping chamber is The pipeline is connected to the absorber; the gas-liquid separation chamber is respectively connected to the exhaust chamber and the pumping chamber pipeline; and the gas-liquid separation chamber is provided with a liquid level detecting element. The automatic exhaust system according to claim 1, wherein the exhaust chamber duct is connected to an exhaust pump, and the exhaust chamber duct is connected to the air pump. The automatic exhaust system according to claim 1 or 2, wherein the exhaust chamber is connected to a water chamber of the low temperature generator via a solenoid valve, and the pump chamber is connected to the barrel of the absorber via a pipe; or The exhaust chamber is connected to the cylinder of the condenser via a solenoid valve, and the pumping chamber is connected to the cylinder of the absorber via a pipeline; or the exhaust chamber is connected to the water chamber of the low temperature generator via a solenoid valve, and the exhaust chamber is Another solenoid valve is connected to the barrel of the condenser, and the pumping chamber is connected to the barrel of the absorber via a pipe. The automatic exhaust system according to claim 1 or 2, wherein the pumping chamber and the gas-liquid separation chamber are connected by an exhaust pipe, and one end of the exhaust pipe extends into the gas-liquid separation chamber, and the distance of the exhaust pipe The distance from the bottom of the gas-liquid separation chamber is smaller than the distance from the liquid level detecting element to the bottom of the gas-liquid separation chamber. The automatic exhaust system according to claim 4, wherein the air suction pipe is of a siphon type or a ejector type. The automatic exhaust system according to claim 1 or 2, characterized in that a vacuum valve is further provided between the exhaust chamber and the low temperature generator and/or the condenser. The automatic exhaust system according to claim 1 or 2, wherein the gas-liquid separation chamber is connected to the absorber through a return pipe. The automatic exhaust system according to claim 3, wherein the liquid level detecting element is connected to the controller, and an output end of the controller is connected to the electromagnetic valve, the exhaust pump, and the air pump. The automatic exhaust system according to claim 1 or 2, characterized in that the exhaust chamber is further provided with an exhaust valve. The automatic exhaust system according to claim 1 or 2, characterized in that the exhaust chamber is further provided with an exhaust probe.

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