Absorption cooling method and device

FIELD: refrigerating and cooling, particularly continuously operating sorption machines, plants or systems.

SUBSTANCE: method involves heating mixture of cooling agent and sorption agent in boiler up to cooling agent evaporation; condensing cooling agent vapor inside condenser to form liquid cooling agent; expanding cooling agent under pressure into evaporator; absorbing the expanded cooling agent by sorption agent in absorber; storing liquid cooling agent in solution between condenser and evaporator. If cold obtaining is required valve located behind receiver in liquid flow direction is opened and liquid under increased pressure is supplied from receiver to evaporator for cold production. Valve located in front of receiver in liquid flow direction is opened only in the case when pressure at condenser outlet exceeds receiver pressure. When boiler does not generate vapor or just before stopping in vapor generation valve located behind the receiver is closed.

EFFECT: possibility to obtain cold just after device actuation.

5 cl, 2 dwg

 

The technical field to which the invention relates.

The present invention relates to a method and device for producing cold and, more specifically, to a method and apparatus for fast start of the cooling process.

The level of technology

Absorption refrigerating machine (set) contains, in schematic manner, the heater (the generator), the evaporator and condenser. For the operation of the machine, the heater is filled with a mixture of at least two miscible substances (refrigerant and absorber), which will be referred to as a binary mixture. This mixture is formed in the absorber, in which the absorption of refrigerant by the absorbent. Refrigerant and absorber must have a significantly different pressure evaporation to the process of heating the boiler the more volatile the substance of the mixture (i.e. refrigerant) was evaporated and then turned capacitor in the liquid.

Absorption refrigerating machine usually comprises a pump in order to ensure the return of a binary mixture from the absorber to the boiler. Vapors pass through the condenser, which turns them into liquid supplied to the expansion valve evaporator to obtain the desired cooling effect.

As described the principle of operation is based on the heating of bi is ary mixture, the start of the cooling process is slow. Indeed, the temperature of the binary mixture must be increased by several tens of degrees before the mixture turns to steam. Until the start of the evaporation, cooling does not occur.

Machine of the type described, the corresponding restrictive part of claim 1 of the claims described in the document DE 2856767 A.

The invention

The problem to which the present invention is directed, is to ensure the production of cold such refrigerating machine since its incorporation.

This problem was solved by the introduction of devices for storing refrigerant under pressure in the receiver provided for this purpose, and providing access control to the specified receiver by means of two valves.

In accordance with the invention the mixture under pressure to accumulate in the receiver during normal operation of the refrigeration machine. When the machine is stopped, the refrigerant under pressure store in the receiver, closing this valve, installed in front of and behind the receiver in the direction of fluid flow. After that, the receiver is disconnected from the cooling circuit and result in him under pressure is stored refrigerant.

This pressure is then used immediately after turning on the refrigeration is down to supply liquid refrigerant under pressure in the cooling circuit, and therefore, for the immediate production of cold. With this purpose, open the valve, located behind the receiver side of the evaporator, leaving a closed valve, located in front of the receiver side of the capacitor. The last valve remains closed all the time until the pressure at the outlet of the condenser is lower than in the receiver.

As soon as you begin the process of vaporization, the valve is located in front of the receiver will begin to pass the refrigerant under pressure, and this agent will partly flow into the evaporator, and partly to fill in the receiver for future use.

Thus, in the first aspect of the invention relates to absorption refrigerating machine containing a boiler, condenser, evaporator, expansion valve and the absorber, as well as a device for storing refrigerant under pressure, comprising at least one receiver, a valve located before the specified receiver in the direction of fluid flow, and a valve located at the specified receiver in the direction of fluid flow. Distinctive features of the refrigeration machine is the fact that the valve is located before the receiver is in the open state when the pressure at its input is above or equal to the pressure at the outlet, and a valve located behind the receiver closes the paragraph and the cessation of production of vapor boiler.

In a preferred embodiment, the receiver is equipped with a safety valve. The receiver and valves located before and behind the receiver, can also be performed in a single unit without separation of any of these three elements from other elements. The valve, located in front of the receiver, preferably represents Elektrokabel.

In the second aspect of the invention relates to a method of absorption cooling, providing the following operations: heating in the reboiler of the mixture refrigerant - absorber to the evaporation of the cooling agent; condensation of the vapors in the condenser with the formation fluid; expanding the refrigerant pressure in the evaporator; the absorption of expanded refrigerant by the absorbent in the absorber; storage of refrigerant in liquid form in the receiver, located between the condenser and the evaporator. Distinctive features of the method is that it additionally includes the following operations: opening the valve located behind the receiver in the direction of fluid flow, when required getting cold feed fluid under pressure from the receiver to the evaporator for the production of cold; opening a valve located at the front of the receiver in the direction of fluid flow only when the pressure on you is the ode of the capacitor exceeds the pressure in the receiver; the closing of the valve, located behind the receiver, when the boiler does not produce vapors, or shortly before production ceased vapor boiler.

List of figures

The invention will become clearer from the subsequent detailed description with reference to the accompanying drawings, which shows a non-limiting example embodiment of the invention.

Figure 1 shows a refrigerating machine with a device for storing refrigerant under pressure.

Figure 2 depicts monoblock embodiment of the device.

Information confirming the possibility of carrying out the invention

As shown in figure 1, the heater 1 uses a resistor as an energy source. The mixture of refrigerant - absorber is heated, and the more volatile of the two components, namely, the refrigerant is vaporized. The resulting vapor condenses in the condenser 2. Then the liquid is supplied under pressure to the valve 3 is located in the direction of fluid flow, before the receiver 4, i.e. controlling access to the receiver 4. The management of this valve 3 may be carried out electrically, by means of a device for measuring differential pressure. Alternatively, it may represent a differential valve which opens when the pressure at its input becomes you the e or equal to the pressure at its output. After that it functions as a check valve.

Below the receiver 4 in the direction of flow has a second valve 5, which is a necessary component of a refrigerating machine according to the invention. Control of this valve is, essentially, the nature of the functioning of the machine. When the refrigerating machine stops working, this valve is closed immediately in order to maintain the pressure in the receiver 4. Similarly, when the machine is turned on, it opens to the refrigerant under pressure can flow into the evaporator 7 through the expansion valve 6.

After that, the refrigerant fed to the absorber 8, which produces mixing it with the absorber for subsequent refilling the boiler 1.

The heat generated in the boiler 1 can have various sources. According to the variant of figure 1, it can be done electrically or may come from other sources of heat, such as exhaust gases of the internal combustion engine.

According to one embodiments of the invention also provides the use of an auxiliary valve controlling the access to the receiver, in order not to slow down the process of starting the machine when the receiver 4 is empty. This valve opens only when the refrigerating machine produces the residual liquid under pressure, so part of it can be stored in the specified receiver.

According to one embodiments of the invention when stopping the machine has the ability to close the valve 5 located behind the receiver, before it is terminated by evaporation. Thus in the condenser 2 will be created increased pressure, which will be stored in the receiver 4. Upon reaching the desired pressure, the heater 1 is turned off. Preservation of the increased pressure in the receiver 4 will produce cold for a longer time until the next start the machine.

In order to comply with the terms of the security, a monoblock version of the device presented in figure 2. In this embodiment applied to the receiver 4, made not with the cooked walls, and in the form of a single part from a material resistant to ammonia. The parameters of the receiver is selected such that he withstood the pressure to 4.9 MPa.

Similarly to the previous example, this embodiment of the device based on the receiver contains a non-return valve 3 located in front of the receiver 4, the valve 5 located behind the receiver, and a relief valve 9, calibrated to a pressure of about 4 MPa. These three components: a non-return valve, safety valve and relief valve are parts of a single device and can't C the change separately.

With this design the replacement of the receiver node is safe, even if it remains ammonia under pressure. Individual change is possible only in relation to the management of the coil 5A of the valve 5.

Both ends of the tube 10 is attached either by welding or by means of two conical connector with deformable Spigots.

The proposed device is based on the receiver may have different shapes and sizes, depending on the parameters of the refrigeration machine to which it is attached.

In some cases, the non-return valve 3 may be replaced by a solenoid.

1. Absorption refrigerating machine containing the boiler (1), a condenser (2), an evaporator (7), expansion valve (6) and the absorber (8), as well as a device for storing refrigerant under pressure, comprising at least one receiver (4), valve (3), located before the specified receiver (4) in the direction of fluid flow, and a valve (5)located at the specified receiver (4) in the direction of fluid flow, characterized in that the valve (3)located before the receiver is in the open state when the pressure at its input is above or equal to the pressure at the outlet, and a valve (5)located behind the receiver closes at the termination of production of vapor boiler.

2. Machine according to claim 1, the tives such as those the receiver (4) is equipped with a safety valve (9).

3. Machine according to claim 1, characterized in that the receiver (4) and valves (3, 5)located in front of and behind the receiver, made in the form of a single node without separation of any of these three elements from other elements.

4. Machine according to claim 1, characterized in that the valve (3), located in front of the receiver, is a solenoid.

5. The method of absorption cooling, providing the following operations: heating in the boiler (1) a mixture of refrigerant-absorber to the evaporation of the cooling agent; condensation of the vapors in the condenser (2) with the formation fluid; expanding the refrigerant pressure in the evaporator (7); the absorption of expanded refrigerant by the absorbent in the absorber (8); storage of refrigerant in liquid form in the receiver (4), located between the condenser (2) and the evaporator (7), characterized in that it further includes the following operations: opening the valve (5)located behind the receiver (4) in the direction of fluid flow, when required getting cold feed fluid under pressure from the receiver to the evaporator (7) for the production of cold; the valve opening (3)located in front of the receiver (4) in the direction of fluid flow only when the pressure at the outlet of the condenser (2) p is Evesham pressure in the receiver (4); the closing of the valve (5)located behind the receiver, when the boiler (1) does not produce vapors, or shortly before production ceased vapor boiler (1).

Priority items:

08.09.1999 according to claim 1;

07.02.2000 - according to claim 2,3,4;

04.09.2000 - item 5.



 

Same patents:

Refrigeration unit // 2044966
The invention relates to refrigeration, and more particularly to a device of the absorption refrigeration units designed for use in household refrigerators or freezers

FIELD: refrigerating and cooling, particularly continuously operating sorption machines, plants or systems.

SUBSTANCE: method involves heating mixture of cooling agent and sorption agent in boiler up to cooling agent evaporation; condensing cooling agent vapor inside condenser to form liquid cooling agent; expanding cooling agent under pressure into evaporator; absorbing the expanded cooling agent by sorption agent in absorber; storing liquid cooling agent in solution between condenser and evaporator. If cold obtaining is required valve located behind receiver in liquid flow direction is opened and liquid under increased pressure is supplied from receiver to evaporator for cold production. Valve located in front of receiver in liquid flow direction is opened only in the case when pressure at condenser outlet exceeds receiver pressure. When boiler does not generate vapor or just before stopping in vapor generation valve located behind the receiver is closed.

EFFECT: possibility to obtain cold just after device actuation.

5 cl, 2 dwg

FIELD: heating.

SUBSTANCE: device (11) of absorption cooling comprises a generator (33) to generate a cooling fluid medium and an absorbing fluid medium by separation of a mixed fluid medium, a condenser (35) of the cooling fluid medium, an evaporator (51) of the cooling fluid medium, an absorber (55) of the cooling fluid medium and a cooling circuit (53). The condenser (35) is connected to the generator (33). The evaporator (51) is connected to the condenser (35) with the help of a pipeline (61) of supply with the cooling fluid medium. The evaporator (51) comprises at least one area of evaporation of the cooling fluid medium, into which the supply pipeline (61) enters. The absorber (55) is connected to the evaporation area and is connected to the generator (33) with the help of the pipeline (91) of supply with the absorbin fluid medium and a pipeline (93) of the mixed fluid medium removal. The circuit (53) comprises a pipeline (71) of the cooling fluid medium circulation with a front input (83) and a rear output (85), connected to the evaporation area. The pipeline (71) comprises the following serially installed components: a reservoir (73) for the cooling fluid medium, a pump (75) and the first heat exchanger (77). The pipeline (71) of circulation is equipped with a check valve (81), which is installed between the first heat exchanger (77) and the rear output (85), for blocking of the fluid medium available between the heat exchanger (77) and the valve (81), when the pump (75) is switched off.

EFFECT: device may be easily and compactly installed on a vehicle.

15 cl, 7 dwg

FIELD: power industry.

SUBSTANCE: absorption cooling machine with multi-stage ejector includes closed circulation circuit in which generator, multi-stage ejector, condenser, throttle, evaporator, pump and heat exchanger are installed in series. Housing of multi-stage ejector is covered with casing so that cavity being a cooling jacket is formed and it consists of n stages which are in-series arranged in the steam flow direction and connected to each other, and each of which includes receiving chamber, nozzle and diffuser. Receiving chamber and nozzle of stage 1 are connected via pipelines to evaporator and generator respectively. Generator is connected to heat exchanger and pump. Receiving chambers of stage 2 and next stages are connected to diffusers of previous stages; guide vanes and heat exchanger are arranged inside them; nozzles of stage 2 and next stages are in-parallel connected to delivery branch pipe of the pump. Casing adjoins the condenser housing and is equipped with inlet branch pipe; cooling jacket and diffuser of the last stage are connected to condenser through the holes made in the wall of its housing and cover plate respectively.

EFFECT: higher efficiency of absorption cooling machine with multi-stage ejector.

3 dwg

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