JPH0594664U - Absorption refrigerator bleed device - Google Patents

Abstract

(57) [Summary] [Purpose] Absorption refrigeration that can automatically release separated and collected gas, does not require a large-capacity gas storage chamber, and facilitates gas entrapment at the absorption port in the absorber. To provide a bleed device for a machine. [Structure] An end of the dilute solution suction pipe for sucking the dilute solution produced in the absorber by a solution circulation pump is opened facing the bottom face of the absorber, and an inverted U-shaped pipe is connected to the opening. , A non-condensable gas separator is provided on the outlet side of the solution circulation pump, and a separator main body section into which the dilute solution flows into the non-condensable gas separator and an exhaust pipe section for storing the non-condensable gas are provided. Between the compartments, a float valve is installed to open the non-condensable gas into the exhaust pipe compartment when the amount of the non-condensable gas in the separator body compartment increases and the liquid level of the dilute solution decreases, and the exhaust pipe compartment is installed. Between the air and the atmosphere, an absorption formula provided with a check valve that opens when the pressure of the non-condensable gas in the exhaust pipe section exceeds a set value and releases the non-condensable gas in the exhaust pipe section to the atmosphere Refrigerator extraction device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an extraction refrigeration system for an absorption refrigerating machine, and more particularly to an absorption refrigerating machine that simplifies a non-condensable gas collection mechanism to improve gas separation.

[0002]

[Prior Art]

 Due to the operating principle of an absorption chiller, it is necessary to maintain the main part of the machine at atmospheric pressure or below.However, due to various reasons, the non-condensing gas gradually accumulates in the machine, and if it is left unattended, There is a risk that the pressure inside the machine will rise above the prescribed pressure and the efficiency of the equipment will decrease. Conventionally, as shown in Japanese Utility Model Publication No. 62-44284, the concentrated solution diverted from the low temperature heat exchanger is cooled with a part of the cooling water to form a part of the pressure lower than that of the absorber. A gas absorber that collects the volatile gas, and a gas storage chamber that stores the gas separated from the auxiliary absorber through a gas separator is provided.The gas storage chamber is connected to this gas storage chamber and is used during cooling operation. A bleeder for an absorption refrigerating machine is known, which is equipped with a vacuum valve that opens when the atmospheric pressure is higher than atmospheric pressure and discharges gas into the atmosphere.

The flow of the absorbing liquid from the auxiliary absorber to the gas separator is as shown in FIG. That is, the refrigerant vapor is introduced from the pipe 17 into the auxiliary absorber 16, the concentrated solution is dropped from the pipe 18 and becomes the diluted solution A while being cooled by the cooling water flowing in the coiled pipe 19, and the gas is separated from the pipe 20. It is designed to be delivered to a vessel. The non-condensable gas B is mixed with the dilute solution A and sent to the gas separator.

[0004]

[Problems to be solved by the device]

 However, in such a conventional bleeder for an absorption refrigerating machine, when the device is downsized and the volume is reduced, it is necessary to control a part of the concentrated solution to the auxiliary absorber 16 so that the flow rate is small. Therefore, it is difficult to control. In particular, when the absorption chiller is cooled by air, the operating pressure changes and it becomes impossible to control it with the orifices and capillaries that are normally used. In addition, it is necessary to manually release the gas to the atmosphere, which requires frequent maintenance. In order to reduce the number of maintenances, it is necessary to increase the capacity of the gas storage chamber, but this makes the entire absorption chiller larger and cannot be downsized.

Further, when the flow of the absorbing liquid from the absorber to the gas separator is arranged as shown in FIG. 4, the gas is separated at the absorption port portion, and it is difficult to entrain the gas and to lead the gas to the gas separator. Become.

The present invention has been made in order to solve the above problems, and its purpose is to have a simple gas collecting mechanism, which can automatically release the collected and separated gas and has a large capacity gas storage chamber. It is an object of the present invention to provide a bleed device for an absorption chiller that does not require the above and that gas is separated at the absorption port portion in the absorber so that the gas can be easily entrained.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention makes the absorbing solution absorb the refrigerant vapor evaporated in the evaporator and sends the dilute solution to the high temperature regenerator via the solution circulation pump. A circulation system that regenerates and separates into a refrigerant and an absorption concentrated solution by heating, and returns the separated refrigerant and absorption concentrated solution to the evaporator and the absorber, and a gas arranged downstream of the solution circulation pump. In the extraction device of the absorption refrigerator including a separator, the suction port for sending the dilute solution in the absorber to the solution circulation pump is composed of an inverted U-shaped tube, and the inside of the gas separator is A zone where the diluted solution stays and an exhaust pipe section are provided, and a float valve that opens when the liquid level of the diluted solution drops is provided between both sections, and the pressure of the exhaust tube section is set between the exhaust tube section and the outside. That a check valve that opens when the value is exceeded is installed And butterflies.

[0008]

[Action]

 Since an inverted U-shaped tube is provided at the suction port for sucking the dilute solution in the absorber, the non-condensable gas mixed in the dilute solution sucked in the suction port is difficult to return to the absorber again. Also, because of the inverted U-shaped tube, the opening faces the bottom of the absorber, and when the dilute solution is sucked by the solution circulation pump, the liquid level fluctuates up and down, causing noncondensable gas near the liquid level. Is easily aspirated together with the dilute solution.

The non-condensable gas mixed in the dilute solution sent to the section where the dilute solution of the gas separator stays by the solution circulation pump is separated from the dilute solution in the section, and is separated on the liquid surface of the dilute solution. Collect. When the amount of accumulated non-condensable gas increases, the pressure of the non-condensable gas pushes down the liquid level of the dilute solution, and the float valve opens as the liquid level decreases. When the float valve opens, the non-condensable gas accumulated on the liquid surface of the dilute solution flows into the exhaust pipe section. When the non-condensable gas flows into the exhaust pipe compartment, the pressure of the non-condensable gas in the compartment where the dilute solution stays decreases, the liquid level of the dilute solution rises, and the float valve closes. When this process is repeated and the pressure in the exhaust pipe section exceeds a certain set value, the check valve opens and the non-condensable gas in the exhaust pipe section is released to the atmosphere. When the non-condensable gas in the exhaust pipe section is released into the atmosphere, the pressure in the exhaust pipe section decreases, and the check valve remains closed until the pressure is increased again by repeating the same procedure. ..

[0010]

【Example】

 An embodiment of an absorption refrigerator according to the present invention will be described below with reference to FIGS. The absorption refrigerator shown in FIG. 1 includes a high temperature regenerator 1 for heating a dilute solution, a separator 2 connected to the high temperature regenerator 1, and a low temperature regenerator 3 connected to the separator 2. A condenser 4 connected to the low temperature regenerator 3, a vaporizer 5 connected to the condenser 4 by a liquid refrigerant pipe 21, and an absorber connected to the evaporator 5 via a refrigerant vapor passage. 6, a solution circulation pump 9 connected to the absorber 6 via a dilute solution suction pipe 15, and a low temperature solution heat exchanger connected to the outlet side of the solution circulation pump 9 via a gas separator 10. 7, and a high temperature solution heat exchanger 8 interposed in a pipe connecting the low temperature solution heat exchanger 7 and the high temperature regenerator 1.

In the absorption refrigerator shown in FIG. 1, the high temperature regenerator 1 has a combustion chamber and absorbs a refrigerant to heat a dilute solution having a low concentration. A separator 2 connected to the high temperature regenerator 1 separates a refrigerant vapor that evaporates from a heated dilute solution and an intermediate concentrated solution that is concentrated by evaporating the refrigerant vapor, The latter is sent to the tube side of the low temperature regenerator 3 and to the heating fluid side of the high temperature solution heat exchanger 8. The high temperature solution heat exchanger 8 applies heat to the dilute solution flowing on the heated fluid side to lower the temperature, and the intermediate concentrated solution flows into the barrel side of the low temperature regenerator 3. In the low temperature regenerator 3, the intermediate concentrated solution flowing from the separator 2 and flowing into the tube side reheats the intermediate concentrated solution flowing into the body side, and new refrigerant vapor is generated from the intermediate concentrated solution. The concentration of the intermediate concentrated solution in which new refrigerant vapor is generated becomes high and becomes a concentrated solution.

The newly generated refrigerant vapor and the refrigerant vapor flowing from the separator 2 flow into the condenser 24 together with the refrigerant liquid generated by applying heat to the intermediate concentrated solution and partially condensing the intermediate concentrated solution, The formed concentrated solution flows into the heating fluid side of the low temperature solution heat exchanger 7. The condenser 4 uses the cooling water to liquefy the refrigerant vapor newly generated in the low temperature regenerator 3 and the refrigerant vapor that has not become the refrigerant liquid in the low temperature regenerator 3 into the refrigerant liquid, and sends it to the evaporator 5. The evaporator 5 is provided with a heat transfer tube (cooling water) 14 through which circulating water to be cooled flows, and the refrigerant liquid sent from the condenser 4 is applied to the outer surface of the heat transfer tube 14 by using a sprayer. Be sprayed. The inside of the evaporator is depressurized to a predetermined pressure lower than the atmospheric pressure, and the sprayed refrigerant liquid takes away the heat of the circulating water flowing through the heat transfer tubes 14 to evaporate, and the circulating water deprived of the heat is cold water. And sent to the required cold water load. Further, the evaporated refrigerant vapor flows into the absorber 6 via the cooling medium vapor passage.

On the other hand, the concentrated solution flowing into the heating fluid side of the low temperature solution heat exchanger 7 and applying heat to the dilute solution flowing in the heated fluid side flows into the absorber 6 and then flows to the upper part thereof. It is sprayed and dripped on the outer surface of the cooling water pipe installed through the provided sprayer. The concentrated solution that has been sprayed and dropped absorbs the refrigerant vapor flowing from the evaporator 5 into the absorber 6 and becomes a dilute solution. The inside of the evaporator 5 is maintained at a predetermined vacuum degree by the absorption action of the absorber 6, and the refrigerant liquid sprinkled on the heat transfer tubes 14 inside the evaporator 5 can be evaporated at a predetermined temperature. .. Further, the absorption heat generated when the concentrated solution absorbs the refrigerant vapor to become the diluted solution is cooled by the cooling water flowing inside the cooling water pipe 13 which is built in the absorber 6 and is constituted by the coiled pipe. The cooling water pipe 13 is also connected to the cooling water pipe in the condenser 4. FIG. 5 shows an example in which the evaporator 5 and the falling-film absorber 6 are arranged in the same container.

The absorbing liquid that has absorbed the refrigerant vapor in the absorber 6 and becomes a dilute solution is passed to the high temperature regenerator 1 via the low temperature solution heat exchanger 7 and the high temperature solution heat exchanger 8 by the solution circulation pump 9. Sent and the cycle described above is repeated.

The pipe connecting the outlet side of the solution circulation pump 9 and the heated fluid inlet (dilute solution inlet) of the low temperature solution heat exchanger 7 is filled with the non-condensable gas contained in the diluted solution sent from the solution circulation pump 9. The gas separator 10 for separating is interposed. The gas separator 10 includes a separator body 10A, which is a cylindrical container in which a dilute solution is retained, and an exhaust pipe section which is connected to an upper portion of the separator body 10A and communicates the inside of the separator body 10A with the outside air. An exhaust pipe 10B, a float type valve installed between the exhaust pipe 10B and the separator body 10A to prevent the dilute solution in the separator body 10A from flowing into the exhaust pipe 10B, and the exhaust pipe. The check valve 12 is attached to the upper opening of 10B and prevents the outside air from flowing into the exhaust pipe 10B. The pipe connecting the separator body 10A and the outlet side of the solution circulating pump 9 and the pipe connecting the separator body 10A and the heated fluid inlet (dilute solution inlet) side of the low temperature solution heat exchanger 7 are both separators. It is connected to the bottom of the main body 10A. The float valve 11 is normally closed by the buoyancy of the dilute solution.

The connecting portion between the absorber 6 and the absorber 6 of the dilute solution suction pipe 15 that connects the inlet side of the solution circulation pump 9 is formed as shown in FIG. That is, the end of the pipe 15 on the absorber side is opened downward facing the bottom surface of the absorber 6 in the lower part of the absorber 6, and the opening is provided through the inverted U-shaped tube to the diluted solution outside the absorber. It is connected to the suction pipe 15.

The concentrated solution that has absorbed the refrigerant vapor while flowing down the falling wall surface in the absorber 6 becomes a dilute solution and accumulates at the bottom of the absorber, and reaches the height of the end opening of the dilute solution suction pipe 15. The dilute solution accumulated at the bottom of the absorber is sucked by the solution circulation pump 9 and sent to the gas separator 10 together with the non-condensable gas mixed in the dilute solution. Suction of dilute solution Since the end opening of the pipe 15 is facing downward and an inverted U-shaped pipe is connected to the end, the dilute solution once sucked into the opening is not mixed with the dilute solution. The condensable gas is fed into the gas separator 10 without being discharged into the absorber through the terminal opening, and is reliably taken out from the absorber. Further, when sucked by the solution circulation pump 9, the liquid level of the dilute solution rises and falls due to the existence of the inverted U-shaped portion, and the refrigerant vapor containing the non-condensable gas is easily sucked together with the dilute solution. In particular, in the falling liquid film type absorber shown in FIG. 5, the non-condensable gas is likely to accumulate on the liquid surface of the dilute solution at the bottom of the absorber, and the effect of sucking the non-condensable gas by the inverted U-shaped tube is great.

The non-condensable gas mixed in the dilute solution sent to the gas separator 10 by the solution circulation pump 9 is separated from the dilute solution in the gas separator and accumulates on the liquid surface of the dilute solution. When the amount of the accumulated non-condensable gas increases, the pressure of the non-condensable gas pushes the liquid surface to lower the float valve 11. When the float valve 11 is opened, the non-condensable gas accumulated on the liquid surface of the dilute solution flows into the exhaust pipe 10B. When the non-condensable gas flows into the exhaust pipe 10B, the pressure of the non-condensable gas in the gas separator body 10A decreases, the liquid level of the dilute solution rises, and the float valve 11 closes. When this process is repeated and the pressure in the exhaust pipe 10B exceeds a certain set value, the check valve 12 opens and the non-condensable gas in the exhaust pipe 10B is released to the atmosphere. When the non-condensable gas in the exhaust pipe 10B is released into the atmosphere, the pressure in the exhaust pipe 10B decreases, and the check valve 12 remains closed until the pressure is increased again by repeating the same procedure. Become. The check valve 12 also plays a role of preventing the inflow of air into the machine when the refrigeration operation is stopped. The length of the exhaust pipe 10B is preferably long in order to promote the condensation of the inflowing refrigerant vapor and prevent the refrigerant from being released into the atmosphere.

[0019]

[Effect of the device]

 As described above, according to the extraction device of the absorption refrigerating machine of the present invention, the dilute solution suction pipe at the bottom of the absorber is provided with the inverted U-shaped portion, so that the non-condensable gas is collected. The non-condensable gas can be efficiently collected without providing a low pressure part, and the size of the entire device can be reduced. In addition, the non-condensable gas separator installed on the outlet side of the solution circulation pump is provided with a separator main body section in which the dilute solution flows and an exhaust pipe section for storing the non-condensable gas, and a separation section is provided between both sections. A float valve is provided to open the non-condensable gas into the exhaust pipe compartment when the amount of the non-condensable gas in the main unit compartment increases and the liquid level of the dilute solution decreases. In addition, a check valve that opens when the pressure of the non-condensable gas in the exhaust pipe section exceeds a certain set value and releases the non-condensable gas in the exhaust pipe section to the atmosphere is collected and separated. The non-condensable gas is automatically released into the atmosphere, reducing the number of maintenance cycles and eliminating the need for a large-capacity gas storage chamber, which makes it possible to downsize the refrigeration system.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a main part of an embodiment of an absorption refrigerator according to the present invention.

FIG. 2 is a sectional view showing details of a portion of an embodiment of the present invention.

FIG. 3 is a sectional view showing an example of a conventional technique.

FIG. 4 is a sectional view showing an example of a conventional technique.

5 is a perspective view showing a part of the embodiment shown in FIG. 1. FIG.

[Explanation of symbols]

1 High temperature regenerator 2 Separator 3 Low temperature regenerator 4 Condenser 5 Evaporator 6 Absorber 7 Low temperature solution heat exchanger 8 High temperature solution heat exchanger 9 Solution circulation pump 10 Gas separator 10A Separator body 10B Exhaust pipe 11 Float type Valve 12 Check valve 13 Cooling water pipe 14 Heat transfer pipe 15 Dilute solution suction pipe 16 Auxiliary absorber 17 pipe 18 pipe 19 Coiled pipe 20 pipe 21 Liquid refrigerant pipe 22 Concentrated solution pipe

Claims (1)

[Scope of utility model registration request] 1. A refrigerant by absorbing refrigerant vapor evaporated in an evaporator into an absorbing solution in an absorber and sending a dilute solution to a high temperature regenerator through a solution circulation pump and heating in the high temperature regenerator. And a circulation system that regenerates and separates the absorption concentrated solution into a refrigerant and the absorption concentrated solution, and returns the separated refrigerant and the absorption concentrated solution to the evaporator and the absorber, and a gas separator disposed downstream of the solution circulation pump. In the extraction apparatus of the absorption type refrigerating machine, the suction port for sending the dilute solution in the absorber to the solution circulation pump is composed of an inverted U-shaped tube, and a section in which the dilute solution stays in the gas separator. An exhaust pipe compartment is provided, and a float valve that opens when the liquid level of the dilute solution drops between both compartments is opened between the exhaust pipe compartment and the outside when the pressure in the exhaust pipe compartment exceeds the set value. Extraction type absorption chiller characterized by having a check valve Qi device.