KR100533567B1 - Air extraction apparatus and evaluation method thereof - Google Patents

Abstract

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a bleeding device capable of reliably discharging non-condensable gas generated inside the absorption chiller or penetrating from the outside of the device and without requiring oiling.

The non-condensing tank 2 which communicates with the absorption chiller main body 100 via the gas-liquid separator 1, and introduces non-condensing gas, such as hydrogen gas generated in the apparatus, and the non-condensing tank 2 so as to be able to communicate. It is a bleeding device provided and provided with the oilless vacuum pump 5 which discharges the non-condensable gas introduce | transduced in the non-condensing tank 2, The gas-liquid separation box 8 and the heat radiation coil upstream of the vacuum pump 5 are provided. (7A) and the like are appropriately installed.

Description

Extractor and its evaluation method {AIR EXTRACTION APPARATUS AND EVALUATION METHOD THEREOF}

TECHNICAL FIELD This invention relates to the scavenging apparatus of the absorption type refrigerator used for cooling / heating.

Absorption-type refrigerators are connected to a regenerator, a condenser, an evaporator, an absorber, and the like in order, and are circulated while absorbing or releasing a refrigerant such as water with an absorbent liquid such as an aqueous lithium emulsified solution, and conducting heat to provide cooling operation. Or a device that provides for heating operation.

In the absorption chiller having the above-described structure, if a regenerator, a condenser, an evaporator, an absorber, a pipe portion connecting them, and the like are formed of iron or stainless steel, and an aqueous solution of a brittle lithium containing an inhibitor in water or an absorbent liquid is used. In addition, hydrogen gas is generated when the absorbent liquid reacts with the metal of the device material to form an anticorrosive coating.

In particular, during operation, the absorbent liquid is heated to 160 ° C. by the regenerator, so that the reaction between the absorbent liquid and the metal is likely to occur and the generation of hydrogen gas also increases.

In addition, since the absorption chiller is made of a high vacuum system as a whole, airtightness is increased by welding or the like. However, penetration of atmospheric components from pinholes and joints is inevitable, and atmospheric components such as nitrogen and oxygen also increase with time. .

Hydrogen gas generated by the above mechanism, nitrogen, oxygen, and the like invaded from the air do not condense at the level of cooling in the freezer, and because the solubility in the absorbent liquid is very small, it stays in the non-liquid part of the evaporator or the absorber and gradually increases its concentration. Becomes higher. In this way, when the concentration of non-condensable gas such as hydrogen gas in the apparatus is increased, evaporation of the refrigerant is suppressed and the freezing capacity is lowered.

For this reason, as shown in FIG. 3, for example, palladium is installed in the non-condensing tank 2 extended from the gas-phase part of the gas-liquid separator 1 connected through the absorption type | mold refrigerator main body 100, the absorption liquid pipe | tube, and the gaseous-phase pipe | tube. The tube 3 is attached, the palladium tube 3 is heated to about 300 to 500 ° C, separated from the absorbent liquid in the gas-liquid separator 1, and the hydrogen gas introduced into the noncondensing tank 2 is transferred to the palladium tube 3. There is a technique for discharging the hydrogen gas of the non-condensing gas generated in the absorption chiller main body by passing through the wall surface.

However, the bleeding apparatus shown in Fig. 3 always needs to heat the palladium tube 3 to 300 to 500 占 폚. In addition, the only non-condensable gas that can be exhausted through the palladium tube 3 is hydrogen gas, and it is not possible to exhaust the atmospheric components such as nitrogen gas and oxygen gas that have penetrated from pinholes such as welds and the like, and oxygen gas. There is this.

In addition, as shown in FIG. 4, the vacuum pump 5X is connected to the noncondensing tank 2 via the solenoid opening / closing valves 4 and 4, and the pressure sensor 6 attached to the noncondensing tank 2 is There is also a technique of starting the vacuum pump 5X to open the solenoid valve 4 when the predetermined pressure is detected, and discharging the noncondensing gas introduced into the noncondensing tank 2.

However, since the bleeding apparatus shown in Fig. 4 uses an oil-sealed vacuum pump 5X, it is necessary to constantly monitor the oil surface and to lubricate appropriately so as not to run out of oil.

In addition, when closing the solenoid valve 4 and stopping the vacuum pump 5X, unless the valve 4X is opened and the intake side is kept at atmospheric pressure, leakage of gas from the solenoid valve 4 or the piping is prevented. Or the oil of the vacuum pump 5X may flow backward due to a temperature change or the like.

Therefore, since the scavenging apparatus of any conventional absorption refrigerator is not satisfactory as described above, non-condensable gas generated inside the absorption refrigerator or penetrated from outside the apparatus can be reliably discharged out of the apparatus, It was necessary to provide the recording device which does not take the trouble, and it became a problem to solve.

The present invention has been made to solve the above problems of the prior art, in the scavenging device for discharging non-condensable gas such as hydrogen gas generated in the absorption chiller out of the device, and communicates with the absorption chiller main body through a gas-liquid separator, And a non-condensing tank into which the non-condensing gas, such as hydrogen gas generated in the apparatus, is introduced, and an oilless vacuum pump provided to communicate with the non-condensing tank and discharging the non-condensing gas introduced into the non-condensing tank. A recorder of the first configuration,

In the bleeding apparatus of the first configuration, the oilless vacuum pump includes an intake chamber including an intake chamber intake port and an intake chamber exhaust port, an exhaust chamber including an exhaust chamber intake port and an exhaust chamber exhaust port, an intake chamber exhaust port part, and an exhaust chamber intake port A cylinder having a piston extending from the portion and having a reciprocating motion, wherein the intake chamber exhaust port is provided with an opening / closing valve which opens the intake chamber exhaust port when the piston is retracted and closes the intake chamber exhaust port when the piston is advanced; The intake chamber intake port communicates with the first intake mechanism and the exhaust chamber exhaust port of the first discharge mechanism provided with an on / off valve for closing the exhaust chamber intake port when the piston is retracted and opening the exhaust chamber intake port when the piston is advanced. It consists of the 2nd discharge mechanism of the same mechanism as the installed 1st discharge mechanism, and the piston of a 1st discharge mechanism and a 2nd discharge mechanism is reversed mutually. The bleeding apparatus of the 2nd structure which carried out reciprocation operation, or the bleeding apparatus of the said 1st structure WHEREIN: An oilless vacuum pump is provided with the intake chamber provided with the intake chamber intake port and the intake chamber exhaust port, and the exhaust chamber intake port and the exhaust chamber exhaust port. And an exhaust chamber and a cylinder having a piston extending from the intake chamber exhaust port portion and the exhaust chamber intake port portion and reciprocating. The intake chamber exhaust port opens the intake chamber exhaust port when the piston is advanced and at the retraction of the piston. A first discharge mechanism provided with an on / off valve for closing the intake chamber exhaust port, and an exhaust valve inlet for closing the exhaust chamber inlet when the piston advances, and an on / off valve for opening the exhaust chamber inlet when the piston retracts; It consists of the 1st discharge mechanism and the 2nd discharge mechanism of the same mechanism installed in communication with the exhaust chamber exhaust port of the mechanism, and the 1st discharge mechanism And the additional recording apparatus of the second configuration to the piston-and-fro movement in opposite directions of a second ejection mechanism,

In the scavenging device of the first or second configuration, the degree of deterioration including the failure of the vacuum pump or the gas from the pipe part on the basis of the change in the pressure upstream of the vacuum pump at the time of starting and / or operating the vacuum pump. The problem of the prior art is solved by providing a method of evaluating a bleeding device for evaluating leakage.

EMBODIMENT OF THE INVENTION Hereinafter, the scavenging apparatus of this invention is demonstrated in detail based on FIG. In addition, in these figures, the same code | symbol is attached | subjected to the part which has a function similar to the part demonstrated in the said FIG.

In the bleeding apparatus of the present invention shown in FIG. 1, the oilless type vacuum pump 5 is connected to the noncondensing tank 2 via the gas-liquid separation box 8 etc. so that communication is possible. Moreover, the extraction pipe 7 provided with two electromagnetic opening / closing valves 4 in series is equipped with the heat radiating coil 7A in the gas-liquid separation box 8 side, and the terminal part opens in the gas-liquid separation box 8, and is shown. .

In addition, the bottom plate of the gas-liquid separation box 8 is connected to a drain pipe 9 having an opening / closing valve 9A interposed therebetween, and the refrigerant liquid and the like stored in the gas-liquid separation box 8 open the opening-and-closing valve 9A. By doing so, it is configured to discharge properly.

The oilless vacuum pump 5 is provided at the end of the vertebral tube 7Z extending from the ceiling plate portion of the gas-liquid separation box 8, and thus passes through the portion of the heat radiating coil 7A of the plural tube 7. Condensate, such as a refrigerant condensed by heat radiation to the atmosphere, is stored at the bottom of the gas-liquid separation box 8, and only the non-condensable gas is derived from the duct 7Z. Only condensate gas is reached.

As the vacuum pump 5, for example, as shown in FIG. 2, it consists of the 1st discharge mechanism 10 and the 2nd discharge mechanism 30, and the 1st discharge mechanism 10 is the intake chamber inlet 11 And an intake chamber 14 having an intake chamber exhaust port 13 opened and closed by an open / close valve 12, and an exhaust chamber intake port 17 opened and closed by an exhaust chamber exhaust port 15 and an open / close valve 16. It is comprised with the cylinder 20 in which the piston 19 which extends from the part of the exhaust chamber 18, the intake chamber exhaust port 13, and the exhaust chamber intake port 17, and reciprocates is inherent.

In addition, the opening / closing valve 12 opens the intake chamber exhaust port 13 when the piston 19 moves downwards in the drawing to increase the volume of the in-cylinder space 21 and the internal pressure decreases, and the piston 19 shows the drawing. When the volume of the in-cylinder space 21 decreases and the internal pressure increases, the intake chamber exhaust port 13 is closed, and the opening / closing valve 16 moves the piston 19 downward in the drawing so that the in-cylinder space ( When the volume of the cylinder 21 increases and the internal pressure decreases, the exhaust chamber inlet 17 is closed, and the piston 19 moves upwards in the drawing to decrease the volume of the space 21 in the cylinder so that the internal pressure increases. It is provided to open the inlet port 17.

The second discharge mechanism 30 includes an intake chamber 34 having an intake chamber exhaust port 33 which is opened and closed by an intake chamber intake port 31, an open / close valve 32, an exhaust chamber exhaust port 35, and an open / close valve ( An exhaust chamber 38 having an exhaust chamber inlet 37 which is opened and closed by 36, and a piston 39 extending from a portion of the intake chamber exhaust port 33 and the exhaust chamber intake port 37 to reciprocate are inherent. The cylinder 40 is comprised.

In addition, the opening / closing valve 32 also opens the intake chamber exhaust port 33 when the piston 39 moves downward in the drawing to increase the volume of the in-cylinder space 41 and the internal pressure decreases. The intake chamber exhaust port 33 is closed when the volume of the in-cylinder space 41 decreases and the internal pressure increases, and the opening / closing valve 36 moves the piston 39 downward in the drawing so that the in-cylinder space ( When the volume of 41 increases and the internal pressure decreases, the exhaust chamber intake port 37 is closed, and the piston 39 moves upwards in the drawing to reduce the volume of the space 41 in the cylinder, thereby increasing the internal pressure. The inlet port 37 is provided to open.

The piston 19 of the first discharge mechanism 10 is connected to the rotary shaft 51L of the motor 50 via the crank 52L, and the piston 39 of the second discharge mechanism 30 is connected to the motor 50. Is connected via a crank 52R to the rotary shaft 51R, and the rotary motion of the drive shafts 51L and 51R by the motor 50 is converted into reciprocating motions of the pistons 19 and 39, respectively, within each cylinder. It is configured to reciprocate.

Moreover, the piston 19 of the 1st discharge mechanism 10 and the piston 39 of the 2nd discharge mechanism 30 are attached so that they may move to mutually reverse directions. Therefore, when the piston 19 of the first discharge mechanism 10 moves downward in the drawing, the piston 39 of the second discharge mechanism 30 moves upward in the drawing, and the piston 19 of the first discharge mechanism 10 is moved. ) Moves upwards in the figure, the piston 39 of the second discharge mechanism 30 moves downward in the figure.

Therefore, when the piston 19 moves below drawing in the 1st discharge mechanism 10, the volume of the in-cylinder space 21 increases, and the pressure of the in-cylinder space 21 decreases, an opening / closing valve ( 12 and 16 are all rotated below the figure, and the intake chamber exhaust port 13 is opened and the exhaust chamber intake port 17 is closed, so that the non-condensable gas introduced into the intake chamber 14 from the intake chamber intake port 11 is shown. Enters the in-cylinder space 21 through the intake chamber exhaust port 13.

And the piston 19 of the 1st discharge mechanism 10 moves below drawing, and the non-condensing gas of the intake chamber 14 flows in the in-cylinder space 21 with the volume increasing from the intake chamber exhaust port 13. When being introduced, the piston 39 of the second discharge mechanism 30 moves upwardly in the drawing, the volume of the in-cylinder space 41 decreases, and the pressure of the in-cylinder space 41 increases, so that the on-off valve ( Both the 32 and 36 rotate upwards in the drawing, the intake chamber exhaust port 33 is closed, and the exhaust chamber intake port 37 is opened.

Therefore, in the exhaust chamber 18 of the 1st discharge mechanism 10, the intake chamber 34 of the 2nd discharge mechanism 30, and the connection pipe of the 1st discharge mechanism 10 and the 2nd discharge mechanism 30, The noncondensable gas is not introduced into the in-cylinder space 41, and the non-condensable gas introduced into the in-cylinder space 41 is exhaust chamber inlet 37, exhaust chamber 38, and exhaust chamber exhaust port 35. Is exhausted from.

On the other hand, when the piston 19 moves upward in the drawing in the first discharge mechanism 10, the volume of the in-cylinder space 21 decreases, and the pressure in the in-cylinder space 21 increases, the opening / closing valve 12 And 16 are all rotated upwards in the drawing so that the intake chamber exhaust port 13 is closed and the exhaust chamber intake port 17 is opened, so that the non-condensable gas of the intake chamber 14 is not introduced into the in-cylinder space 21. Instead, the noncondensable gas introduced into the in-cylinder space 21 enters the exhaust chamber 18 through the exhaust chamber inlet 17.

Then, when the piston 19 of the first discharge mechanism 10 moves upward in the drawing and the non-condensable gas is extruded from the in-cylinder space 21 to the exhaust chamber 18, the second discharge mechanism 30 is applied. Piston 39 moves downwards in the drawing to increase the volume of the in-cylinder space 41, thereby lowering the pressure in the in-cylinder space 41, so that the on / off valves 32 and 36 both rotate below the drawing to intake the chamber. The exhaust port 33 is opened, and the exhaust chamber inlet 37 is closed.

Therefore, the outside air is not introduced into the in-cylinder space 41 through the exhaust chamber exhaust port 35, the exhaust chamber 38, and the exhaust chamber inlet 37, and the first exhaust mechanism ( Non-condensing gas in the exhaust chamber 18 of the exhaust chamber 18, the intake chamber 34 of the second discharge mechanism 30, and the connection pipe between the first discharge mechanism 10 and the second discharge mechanism 30 is formed in the intake chamber exhaust port. Is introduced from (33).

Therefore, the non-condensed gas stored in the non-condensed tank 2 is started by activating the motor 50 to reciprocate the pistons 19 and 39 in the cylinders 20 and 40 and open the solenoid valve 4. Can be exhausted.

Reference numeral 60 denotes a controller of the bleeding device. When the pressure sensor 6 attached to the non-condensing tank 2 detects a predetermined high pressure, for example, 10 kPa (set value is variable), the motor 50 is started. After the start of the 50, a predetermined time, for example, 10 seconds (the set value is variable), the solenoid valve 4 is opened so that the pressure sensor 6 has a predetermined low pressure, for example, 4 kPa (the predetermined value is variable). Is detected, the solenoid valve 4 is closed, and then the motor 50 is controlled to stop.

In addition, the controller 60 causes the pressure sensor 6 to be higher than a predetermined high pressure, for example, 10 kPa when a predetermined time elapses after opening of the solenoid valve 4, for example, 2 seconds (set value is variable). When the pressure is detected, the alarm means 61 is operated by judging that a serious abnormality is occurring in the bleeding apparatus, for example, an abnormal situation such as the pistons 19 and 39 are not operating or air is leaked (in large quantities). A predetermined alarm, for example, a buzzer, an alarm lamp flashing, etc., closes the solenoid valve 4 and then stops the motor 50, after which the pressure sensor 6 No matter how high the pressure to be detected is, the write operation is not performed.

In addition, even if the pressure sensor 6 detects a pressure lower than 10 kPa, the controller 60 may operate within a predetermined time, for example, 10 minutes from starting of the motor 50 and opening of the solenoid valve 4 (variable). When the pressure sensor 6 does not detect a predetermined low pressure, for example, a pressure of 4 kPa within 6 m), it is determined that the capacity of the bleeding apparatus is deteriorated, and the alarm means 61 is operated to cause a predetermined alarm, for example, caution. It is configured to display the ventilation and to continue the extraction.

In addition, although a write operation stops once as a predetermined | prescribed alarm method, when the pressure sensor 6 detects a predetermined pressure, for example, 10 kPa, you may make it restart again.

In addition, the gas-liquid separator 1 of the scavenging apparatus injects a part of the absorbent liquid conveyed to the high temperature regenerator or the like by the absorbent liquid pump (not shown) into the ejector 1A, and fires from the gas phase part such as the absorber by using the negative pressure generated therein. It is a device which draws in gas containing condensation gas, and separates it into an absorption liquid and the non-condensable gas which does not melt | dissolve in an absorption liquid, and is known conventionally.

Therefore, a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, an absorber, a high temperature heat exchanger, a low temperature heat exchanger, a pipe part connecting them, and the like, which are not shown, are formed of, for example, iron or stainless steel, and the refrigerant as described above. If an embrittlement aqueous lithium solution containing an inhibitor is used in the water and the absorbent liquid, the absorbent liquid is heated at, for example, 160 ° C in a high temperature regenerator during operation, and reacts with the metal constituting the device to form an anticorrosive coating on the surface. In the reaction, hydrogen gas is generated. In this way, the hydrogen gas generated in the apparatus is not condensed in the cooling temperature range in the absorption chiller, and since the solubility in the absorbent liquid is also very small, it stays in the non-liquid part of the absorber or the like, and the concentration thereof is sequentially increased.

However, when the scavenging device of the present invention is assembled in the absorption type refrigerator, the gaseous phase portion of the absorption type refrigerator main body 100 is driven by the negative pressure generated by the high-speed movement of some of the absorption liquids discharged by the operation of the absorption liquid pump (not shown). Gas members such as refrigerant vapor, free absorbing liquid and hydrogen gas present are introduced into the gas-liquid separator 1 and separated into an absorbing liquid and a non-condensable gas which does not dissolve in the absorbing liquid, and the absorbing liquid of the gas-liquid separator 1 The non-condensable gas returned from the bottom side to the absorption chiller main body 100 and separated from the absorbent liquid is introduced into the non-condensing tank 2 so that the pressure in the non-condensing tank 2 is at a predetermined high pressure, for example, 10 kPa. When reached, the vacuum pump 5 is started by the controller 60, and after a predetermined time, the solenoid valve 4 is opened to discharge the non-condensed gas stored in the non-condensed tank 2.

In addition, when the pressure sensor 6 detects a predetermined high pressure, for example, a pressure higher than 10 kPa even after a predetermined time, for example, 2 seconds elapses after the valve opening of the solenoid valve 4, the control device 60 The alarm device 61 is operated by determining that a serious abnormality, for example, the pistons 19 and 39 do not operate or a large amount of air leaks into the bleeding apparatus, is occurring.

Further, even when the vacuum pump 5 is operated for a predetermined time, for example, for 10 minutes, even when the pressure measured by the pressure sensor 6 does not decrease to a predetermined low pressure, for example, 4 kPa, the control device 60 may operate the vacuum pump. It judges that the capability of (5) is falling, and operates the warning means 61. FIG.

In addition, since this invention is not limited to the said Example, various deformation | transformation is possible according to the meaning described in the claim.

For example, the fall of capacity of the bleeding device may be determined by comparing the change rate of pressure detected by the pressure sensor 6 with a standard value.

According to the scavenging apparatus of the absorption chiller according to the present invention, it is possible to reliably discharge the non-condensable gas such as hydrogen gas generated inside the absorption chiller, and the non-condensable gas such as atmospheric components leaked into the apparatus. In addition, trouble such as oiling becomes unnecessary.

1 is an explanatory diagram showing an embodiment of the present invention.

2 is an explanatory diagram of an oilless pump used in one embodiment.

3 is an explanatory diagram showing a prior art;

4 is an explanatory diagram showing another conventional technique.

<Explanation of symbols for the main parts of the drawings>

1: gas-liquid separator

2: non-condensing tank

3: palladium tube

4: solenoid valve

5, 5X: vacuum pump

6: pressure sensor

7, 7Z: Injector

7A: heat dissipation coil

8: gas-liquid separation box

9: drain pipe

9A, 12, 16, 32, 36: on-off valve

10: first discharge mechanism

11, 31: intake chamber intake port

13, 33: intake chamber exhaust port

14, 34: intake chamber

15, 35: exhaust chamber exhaust port

17, 37: exhaust chamber inlet

18, 38: exhaust chamber

19, 39: piston

20, 40: cylinder

21, 41: In-cylinder space

30: second discharge mechanism

50: motor

51L, 51R: Drive Shaft

52L, 52R: Crank

60 control device

61: alarm means

100: Absorption Chiller

Claims (4)

In the scavenging device for discharging non-condensable gas, such as hydrogen gas generated inside the absorption chiller outside the apparatus, A non-condensable tank communicating with the main body of the absorption type refrigerator via a gas-liquid separator, into which a non-condensable gas such as hydrogen gas generated in the apparatus is introduced, and a non-condensable gas introduced into the non-condensable tank so as to communicate with the non-condensable tank. And a heat dissipation coil for condensing the moisture contained therein, a gas-liquid separation box for separating the condensed water, and an oilless vacuum pump for discharging the non-condensable gas from which the water is separated. 2. An oilless vacuum pump according to claim 1, wherein the oilless vacuum pump extends from an intake chamber having an intake chamber intake port and an intake chamber exhaust port, an exhaust chamber having an exhaust chamber intake port and an exhaust chamber exhaust port, an intake chamber exhaust port part, and an exhaust chamber intake port part. And a cylinder having a piston for reciprocating operation, the intake chamber exhaust port is provided with an opening / closing valve for opening the intake chamber exhaust port when the piston is retracted and closing the intake chamber exhaust port when the piston is advanced, and the piston at the exhaust chamber intake port The first discharge mechanism provided with an on-off valve for closing the exhaust chamber intake port at the retreat of the vehicle and opening the exhaust chamber intake port at the time of advancement of the piston, and the first discharge device in which the intake chamber intake port communicates with the exhaust chamber exhaust port of the first discharge mechanism. And a second discharge mechanism of the same mechanism as the mechanism, wherein the pistons of the first discharge mechanism and the second discharge mechanism are reciprocated in opposite directions to each other. Additional recording apparatus as ranging. 2. An oilless vacuum pump according to claim 1, wherein the oilless vacuum pump extends from an intake chamber having an intake chamber intake port and an intake chamber exhaust port, an exhaust chamber having an exhaust chamber intake port and an exhaust chamber exhaust port, an intake chamber exhaust port part, and an exhaust chamber intake port part. And a cylinder having a piston for reciprocating operation, the intake chamber exhaust port is provided with an opening / closing valve for opening the intake chamber exhaust port when the piston is advanced, and closing the intake chamber exhaust port when the piston is retracted, and the piston in the exhaust chamber intake port The first discharge mechanism provided with an on-off valve for closing the exhaust chamber intake port at the time of advancing and opening the exhaust chamber intake port at the retraction of the piston, and the first discharge device in which the intake chamber intake port is in communication with the exhaust chamber exhaust port of the first discharge mechanism. And a second discharge mechanism of the same mechanism as the mechanism, wherein the pistons of the first discharge mechanism and the second discharge mechanism are reciprocated in opposite directions to each other. Additional recording apparatus as ranging. In the method for evaluating the recording device according to any one of claims 1 to 3, A method of evaluating a bleeding apparatus characterized by evaluating the degree of deterioration including a failure of the vacuum pump or the leakage of gas from a pipe part on the basis of a change in pressure on the upstream side of the vacuum pump during start-up and / or operation of the vacuum pump. .