KR20050055594A - Gas extraction apparatus - Google Patents

Abstract

An object of the present invention is to provide a scavenging device that prevents a decrease in the capacity of the absorption chiller by removing the water of the oil-free pump.

The downstream side of the solenoid on / off valves 4A, 4B of the duct 7 connecting the noncondensing tank 2 and the gas-liquid separation box 8 is branched, and the end is opened to the atmosphere to open the solenoid on / off valve 4C. A vertebral duct 7B is provided. When the pressure sensor 6 detects the predetermined high pressure, the vacuum pump 5 is started to operate, and when the predetermined time t1 elapses, the solenoid valves 4A and 4B are opened to perform the extraction operation. After that, when the pressure sensor 6 detects the predetermined low pressure, the solenoid valves 4A and 4B are closed. When the predetermined time t2 elapses, the solenoid valve 4C is opened this time, and the vacuum The atmosphere is circulated into the pump 5 to remove moisture of the non-condensable gas remaining in the vacuum pump 5.

Description

Additional device {GAS EXTRACTION APPARATUS}

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, and an absorber one after another, and circulated while absorbing or releasing refrigerant such as water by absorbing liquids such as an aqueous lithium emulsification solution, and releasing them. It is a device which provides or provides for heating operation.

In the absorption chiller having the above-described structure, if a regenerator, a condenser, an evaporator, an absorber, and a pipe portion connecting the same are formed of iron or stainless steel, an absorbent lithium solution containing an inhibitor in water and an absorbent liquid is used. Hydrogen gas is generated when the anticorrosive coating is formed by reacting with a metal of the device material.

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 a high vacuum system as a whole, airtightness is increased by welding or the like, but intrusion of atmospheric components from pinholes and joints is inevitable, and atmospheric components such as nitrogen and oxygen also increase with time. do.

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

For this reason, as shown in FIG. 7, for example, a palladium tube 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 tube, and the gaseous-phase tube. (3) was attached, the palladium tube (3) was heated to about 300 to 500 ℃, hydrogen gas separated from the absorbing liquid in the gas-liquid separator (1) introduced into the non-condensing tank (2) of the palladium tube (3) There is a technique for discharging hydrogen gas of non-condensing gas generated in the absorption chiller body by passing through a wall surface.

However, the bleeding apparatus shown in FIG. 7 always needs to heat the palladium tube 3 to 300 to 500 ° C. 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 through pinholes and joints such as welds, and the like. There is this.

In light of this, the applicant has been proposed to use a vacuum pump without oil as the vacuum pump (see Patent Document 1, for example).

[Patent Document 1]

Japanese Patent Application No. 2003-146238

However, in the oil-free pump, if water (droplets) remain in the pump, the following problem is considered. For example, when the vane adheres to the valve seat in the cylinder due to water droplets attached to the vane (valve) in the pump, malfunction of the vane occurs, or water is sucked (expanded) in the state containing water in the cylinder. The expansion capacity of the pump was larger than the suction capacity of the pump, such that a sufficient suction force could not be obtained, resulting in a state in which the capacity of the absorption refrigerator could not be sufficiently generated.

Accordingly, the present invention has been made to solve the above problems, and to provide a scavenging device that prevents the deterioration of the capacity of the absorption chiller by removing the water of the oil-free pump.

The invention according to claim 1 is a scavenging device for discharging non-condensable gas such as hydrogen gas generated inside an absorption chiller out of the apparatus, and communicates with the absorption chiller main body via a gas-liquid separator to generate fire such as hydrogen gas generated in the apparatus. A non-condensing tank into which the condensation gas is introduced, and an oil-free vacuum pump provided in communication with the non-condensing tank and discharging the non-condensing gas introduced into the non-condensing tank; Or means for removing water remaining in the vacuum pump and / or water condensing in the vacuum pump at the end of the operation.

In the invention according to claim 2, in the invention described in claim 1, the bleeding device is an upstream side of the vacuum pump to radiate and condense the non-condensable gas, and a gas-liquid separating gas-liquid separation of the condensed non-condensed gas. It is characterized in that the separator is installed.

In the invention according to claim 3, the means for removing water is connected to an upstream side of the vacuum pump, one of which is connected to the noncondensing tank via an electromagnetic shutoff valve, and the other of It is characterized by providing a branch circuit which opens to the atmosphere via the electromagnetic on / off valve and controls the electromagnetic on / off valve.

The invention according to claim 4 is the method according to claim 1 or 2, wherein the means for removing water is connected to an upstream side of the vacuum pump, one of which is connected to the noncondensing tank, and the other of which is open to the atmosphere. It is a means for providing a room valve and controlling this three-way valve.

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 the same function as the part demonstrated in FIG. 7 mentioned above also in these drawings.

In the bleeding apparatus of the present invention shown in Fig. 1, the oilless vacuum pump 5 is connected to the noncondensing tank 2 via a gas-liquid separation box 8 or the like so as to be in communication with each other. In addition, one end portion is connected to the non-condensing tank 2, the other end is connected to the gas-liquid separation box 8, and the heat dissipation coil 7 including the solenoid valves 4A to 4C is connected to the heat dissipation coil 7A. It is provided in the said gas-liquid separation box 8 side. The electromagnetic on-off valves 4A and 4B are provided in series with the extraction pipe 7, and the electromagnetic on-off valve 4C branches off from the extraction pipe 7 and the branch pipe 7B is open at the end to the atmosphere. It is installed.

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

The oil-free vacuum pump 5 is installed at the end of the duct 7Z extending from the ceiling of the gas-liquid separation box 8, and thus passes through the portion of the heat radiating coil 7A of the duct 7. When condensate such as refrigerant condensed by heat radiation to the atmosphere is collected at the bottom in the gas-liquid separation box 8, and only the non-condensable gas is derived from the extraction pipe 7Z. This reaches.

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 to decrease the internal pressure, and the piston 19 shows the drawing. It moves upward and closes the intake chamber exhaust port 13 when the volume of the in-cylinder space 21 decreases and the internal pressure is increased, and the opening / closing valve 16 moves the piston 19 downward in the drawing so that the in-cylinder space ( When the volume of 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 cylinder 21 to increase the internal pressure. 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 downwards in the drawing to increase the volume of the in-cylinder space 41 to decrease the internal pressure. When the volume of the in-cylinder space 41 decreases and the internal pressure is increased, the intake chamber exhaust port 33 is closed when the cylinder 39 moves upward. When the volume of 41 increases and the internal pressure decreases, the exhaust chamber inlet 37 is closed, and when the piston 39 moves upwards in the drawing, the volume of the space 41 in the cylinder decreases, 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 rotational motion of the drive shafts 51L and 51R by the motor 50 is converted into reciprocating motion of each of the pistons 19 and 39, and reciprocated within each cylinder. It is configured to exercise.

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 opposite 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 downward in the drawing in the first discharge mechanism 10 to increase the volume of the in-cylinder space 21 and decrease the pressure of the in-cylinder space 21, the opening / closing valve 12 And 16 are all rotated below the drawing, 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 It enters into the in-cylinder space 21 through the intake chamber exhaust port 13.

And the non-condensable gas of the intake chamber 14 is introduce | transduced from the intake chamber exhaust port 13 in the in-cylinder space 21 where the piston 19 of the 1st discharge mechanism 10 moves below drawing, and the volume increases. When the piston 39 of the second discharge mechanism 30 moves upward, the volume of the in-cylinder space 41 is reduced and the pressure of the in-cylinder space 41 is increased. 36 all rotate upwards in the figure, and 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-condensed 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 to decrease the volume of the in-cylinder space 21 and increase the pressure of the in-cylinder space 21, the opening / closing valve 12, 16 all rotate upwards, and 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, 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 Since the piston 39 moves downward in the drawing to increase the volume of the in-cylinder space 41 and lowers the pressure in the in-cylinder space 41, the on / off valves 32 and 36 both rotate below the drawing so that the intake chamber 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).

Accordingly, the non-condensed gas accumulated in the non-condensed tank 2 is operated by starting the motor 50 to reciprocate the pistons 19 and 39 in the cylinders 20 and 40 and opening the solenoid valve 4. Can be exhausted.

Next, the operation of the recording apparatus of the present invention will be described.

First, reference numeral 60 shown in Fig. 1 denotes a controller of the recorder, and reference numeral 61 denotes an alarm means.

As shown in the timing chart of Fig. 3, when the pressure sensor 6 attached to the noncondensing tank 2 detects a predetermined high pressure, for example, 10 kPa (set value is variable), the controller 60 The motor 50 is started, and after the predetermined time t1 after the motor 50 is started, the solenoid valves 4A and 4B are opened from the controller 60 and stored in the non-condensing tank 2. The condensate gas is discharged to the atmosphere to perform the extraction operation. Then, when the pressure sensor 6 detects a predetermined low pressure, for example, 4 kV (set value is variable), when the predetermined time t2 elapses by closing the solenoid valves 4A and 4B from the controller 60. This time, the solenoid on-off valve 4C is opened from the controller 60 for a predetermined time t3, and the atmosphere is released into the vacuum pump 5 via the heat radiating coil 7A and the gas-liquid separator 8 from the extraction pipe 7B. Suction and discharge are performed to remove moisture remaining in the vacuum pump (5). The motor 50 is controlled to be approximately synchronized with the closing of the solenoid valve 4C or to stop slightly faster than the closing of the solenoid valve 4C.

As a result, the operation of the vacuum pump 5 can be stopped in a state where water contained in the non-condensable gas and remaining in the vacuum pump 5 has been removed, and the operation of the vacuum pump 5 due to the moisture is poor. Can be prevented.

In addition, as shown in the timing chart of FIG. 4, in addition to the control shown in the timing chart of FIG. 3, the solenoid valve 4C is opened for a predetermined time t4 in synchronism with the start of the operation of the vacuum pump 5. The control may be performed. However, 4 C of said electromagnetic on / off valves must be closed before opening of the said electromagnetic on / off valves 4A and 4B. That is, the predetermined time t4 should be less than the predetermined time t1.

In this manner, with the start of operation of the vacuum pump 5, the electromagnetic on / off valve 4C is opened to circulate the atmosphere into the vacuum pump 5, and then the electromagnetic on / off valve 4C is closed. The opening and closing valves 4A and 4B are opened to perform the extraction operation of the non-condensable gas stored in the non-condensing tank 2, so that the additional extraction is performed while the moisture of the non-condensable gas remaining in the vacuum pump 5 is sufficiently removed. Since the operation can be started, the suction capacity of the vacuum pump 5 can be sufficiently exhibited from the start of the operation of the additional write operation.

As such a scavenging apparatus, it is also possible to set it as the scavenging apparatus shown in FIG.

In the bleeding apparatus shown in FIG. 5, the solenoid on-off valves 4B and 4C shown in FIG. 1 are replaced with a three-way valve 4D. In addition, this 3-way valve 4D is set to the direction which communicates the vacuum pump 5 and the non-condensing tank 2 via the gas-liquid separation box 8 in an OFF state, and is ON state. In this case, the suction side of the vacuum pump 5 is set in the direction in which the air is communicated to the atmosphere via the gas-liquid separation box 8.

Referring to this operation, when the pressure sensor 6 attached to the noncondensing tank 2 detects a predetermined high pressure, for example, 10 kPa (setting value is variable) with reference to the timing chart shown in FIG. First, the motor 50 is started with the three-way valve 4D off from the controller 60, and after the predetermined time t5 after the motor 50 is started, three directions from the controller 60 are started. The valve 4D is turned on.

As a result, the air is circulated into the vacuum pump 5 at the same time as the operation of the timing chart of FIG. 4 and the moisture of the non-condensable gas remaining in the vacuum pump 5 is removed. Since the extraction operation is started, the suction capacity of the vacuum pump 5 can be sufficiently exhibited from the start of the operation of the extraction operation.

Then, when the pressure sensor 6 detects a predetermined low pressure, for example, 4 kPa (set value is variable), the solenoid valve 4A is closed, and when the predetermined time t7 elapses, three directions from the controller 60 occur. The valve 4D is turned off, and the vacuum pump 5 is stopped after a predetermined time t8.

Thereby, similar to the timing chart of FIG. 4, the water contained in the non-condensable gas and remaining in the vacuum pump 5 can be removed to stop the operation of the vacuum pump 5.

In addition, this invention is not limited to the said Example, A various deformation | transformation is possible according to the meaning described in a claim. For example, in FIG. 1, the duct 7B may be provided between any one of the solenoid valve 4B and the vacuum pump 5, and the solenoid valve 4A and the vacuum pump of FIG. It may be provided at any one of positions (5).

In addition, for example, the fall of capacity of the bleeding apparatus 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, non-condensable gas such as hydrogen gas generated inside the absorption chiller, and non-condensed gas such as atmospheric components leaking into the device may be added to moisture contained in the non-condensed gas. It can be safely discharged out of the unit without being affected.

In a circuit for sucking gas containing water, it is an effective means when using an oil-free pump.

1 shows an embodiment of the present invention.

2 is a view of an oil free pump used in one embodiment.

Fig. 3 is a timing chart of control for removing water in the vacuum pump at the end of the write-in operation.

Fig. 4 is a timing chart of control for removing water in the vacuum pump at the start and end of the write-in operation.

Fig. 5 shows an embodiment of the present invention.

Fig. 6 is a timing chart of control for removing moisture in the vacuum pump at the start of the write operation and at the end of the drive.

7 is an explanatory diagram showing a prior art.

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

1: gas-liquid separator

2: non-condensing tank

3: palladium tube

4A to 4D: Electronic On / Off Valve

4D: 3 way valve

5: 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, The non-condensing tank is introduced into the non-condensing tank and the non-condensing tank is introduced into the non-condensing tank and the non-condensing tank in which the non-condensing gas, such as hydrogen gas generated in the device is introduced through the gas-liquid separator in communication with the main body of the absorption refrigerator. And a means for removing the water remaining in the vacuum pump and / or the water condensed in the vacuum pump at the start and / or end of the operation of the vacuum pump. Characterized in that the cardinal device. The said bleeding apparatus is provided with the heat-dissipation coil which heat-dissipates and condenses the said non-condensable gas, and the gas-liquid separator which separates the gas-liquid separation of the condensed non-condensable gas is provided upstream of the said vacuum pump. Cardinal device. The said means for removing water is connected to the upstream side of the said vacuum pump, one side is connected to the said non-condensing tank via the solenoid valve, and the other is the atmosphere via the solenoid valve. And a means for providing an open branch circuit and controlling these electromagnetic on / off valves. The said water removal means is provided with the three-way valve of Claim 1 or 2 which connects one side to the said non-condensing tank and opens the other side to the atmosphere upstream of the said vacuum pump. A scavenging device, characterized in that it is a means for controlling the three-way valve.