JP3140376B2 - Absorption air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption type air conditioner capable of cooling a room using an absorption type refrigeration cycle, and more particularly to a technique for extracting non-condensable gas in the absorption type refrigeration cycle.

[0002]

2. Description of the Related Art An absorption refrigeration cycle uses a highly corrosive absorption liquid. Therefore, when corrosion occurs in the absorption refrigeration cycle, insoluble non-condensable gas such as hydrogen gas is generated.
The non-condensable gas generated in the absorption refrigeration cycle is gradually accumulated in the absorber having the lowest internal pressure in the absorption refrigeration cycle. Therefore, the internal pressure of the absorber and the evaporator increases due to the presence of the non-condensable gas. As a result,
The boiling point of the refrigerant in the evaporator rises, the evaporation capacity decreases, and the refrigeration capacity of the absorption refrigeration cycle decreases.

[0003] Therefore, conventionally, there has been proposed an air extraction device for extracting non-condensable gas generated in the absorption refrigeration cycle from the absorption refrigeration cycle. The bleeder introduces a part of the absorption liquid of the absorption refrigeration cycle and the non-condensable gas accumulated in the absorption refrigeration cycle, and alternately discharges the introduced absorption liquid and the non-condensable gas by the action of the siphon. Auxiliary absorber (an example of a gas-liquid mixing means), a non-condensable gas tank for storing non-condensable gas, and an absorbent and non-condensable gas discharged from the auxiliary absorber are separated into non-condensable gas tank. And a gas-liquid separator for guiding and returning the absorbent to the refrigeration cycle.

[0004]

An example of a conventional gas-liquid separator will be described with reference to FIG. Conventional gas-liquid separator 100
Is a vessel-shaped separation vessel 101, and a gas-liquid downcomer 1 that guides the absorbent and non-condensable gas discharged from the auxiliary absorber into the separation vessel.
02, a gas discharge pipe 103 for guiding the non-condensable gas separated in the separation vessel 101 to the non-condensable gas tank, and a separation vessel 10
1 and an absorption liquid return pipe 104 for returning the absorption liquid separated into the absorption refrigeration cycle. Reference numeral 105 in the separation container 101 is a baffle plate for ensuring separation of the absorbing liquid and the non-condensable gas.

[0005] Since the gas-liquid separator 100 is supplied with a highly corrosive absorbing liquid, a welding technique is required for joining the various parts. Then, in order to form the separation container 101, welding at two or more locations is required (see arrow α in the figure). Also,
In a separation vessel 101, a gas-liquid downcomer 102, a gas exhauster 10
3 and the absorption liquid return pipe 104 need to be welded at three locations (see arrow β in the figure). That is, the conventional gas-liquid separator 100 requires welding at five or more locations, making it difficult to manufacture, and as a result, causing a problem that the manufacturing cost increases.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an absorption-type air conditioner in which the manufacturing cost is kept low by minimizing the welding portion of each part of the gas-liquid separator. It is in.

[0007]

Means for Solving the Problems The absorption type air conditioner of the present invention employs the following technical means to achieve the above object. [Means of claim 1] Absorption type air conditioner comprises: a) heating means for heating the absorption liquid; and b) a regenerator for heating the absorption liquid with the heating means to vaporize a part of the absorption liquid. A condenser that cools and liquefies the vaporized refrigerant generated in the condenser, an evaporator that evaporates the liquefied refrigerant liquefied in the condenser under low pressure, an absorber that absorbs the vaporized refrigerant evaporated in the evaporator into an absorbent, An absorption refrigeration cycle having a solution pump for pumping the absorption liquid in the absorber to the regenerator; and c) introducing the non-condensable gas in the absorption refrigeration cycle and removing the absorption liquid in the absorption refrigeration cycle. Gas-liquid mixing means for introducing a part and discharging the introduced non-condensable gas and absorbing liquid; d) a non-condensable gas tank for storing the non-condensable gas; and e) non-condensable gas flowing from the gas-liquid mixing means. And absorbing liquid Is, by separating the guided noncondensable gas and absorbing liquid, leading the separated noncondensable gas to the non-condensable gas tank, and a gas-liquid separator for guiding the separated absorbing liquid to the absorption refrigerating cycle.

The gas-liquid separator is disposed below the absorber and the non-condensable gas tank, and is connected to a connecting pipe connecting the inside of the absorber and the non-condensable gas tank; And a gas-liquid down pipe that guides the non-condensable gas and the absorbing liquid to a portion that rises toward the non-condensable gas tank in the connection pipe.

Further, the gas-liquid mixing means is arranged inside the absorber, and the gas-liquid downcomer is arranged so as to be inserted into the connection pipe from inside the absorber.

[0010]

(2) The absorption type air conditioner of (1), wherein the gas-liquid mixing means is cooled by cooling means, and the vaporized refrigerant introduced inside together with the non-condensable gas is absorbed by the absorbing liquid. Is characterized in that the heat of absorption generated at the time of heating is removed.

[0013] The gas-liquid discharge passage for guiding the non-condensable gas and the absorption liquid from the gas-liquid mixing means to the gas-liquid downcomer pipe is provided in the absorption air conditioner according to the first or second invention. Gas-liquid that is provided to hang down from the gas-liquid mixing means so as to drop the absorbing liquid introduced into the gas-liquid mixing means downward, and sucks the absorbing liquid and the non-condensable gas in the gas-liquid mixing means. The suction port side is provided downward, and the non-condensable gas in the gas-liquid mixing means causes the gas-liquid suction port to cause the non-condensable gas in the gas-liquid mixing means to flow from the gas-liquid suction port. It is characterized by being sucked into the discharge passage.

[0014] In the absorption air conditioner according to claim 1, the gas-liquid mixing means includes a venturi pipe opened in a non-condensable gas atmosphere of the absorption refrigeration cycle, and a pressure pump from the solution pump. An ejector having a nozzle for injecting a part of the absorbed liquid into the venturi pipe, wherein the non-condensable gas sucked together with the absorbent in the venturi pipe is guided to the gas-liquid downcomer pipe. .

[0014]

[Action and effect of the invention]

[Action and Effect of Claim 1] The absorber and the non-condensable gas tank are connected by a connecting pipe at the lower part, and the non-condensable gas and the absorbing liquid flowing out of the gas-liquid mixing means are discharged by the gas-liquid down pipe in the connecting pipe. It is led to the part which rises toward the non-condensable gas tank. As a result, the non-condensable gas and the absorbing liquid flowing out of the gas-liquid down pipe are separated in the connection pipe, and the separated non-condensable gas rises up the connection pipe and is guided into the upper non-condensable gas tank. Further, the absorbing liquid separated in the connection pipe is led to the absorber through the connection pipe.

In the present invention, the conventional gas discharge pipe and the absorption liquid return pipe are used as a common connection pipe, and the connection pipe fulfills the function of the conventional separation vessel, so that the separation vessel can be eliminated. For this reason, the formation of a separation vessel becomes unnecessary, and the connection between the gas discharge pipe and the absorption liquid return pipe becomes unnecessary. As a result, the number of parts of the gas-liquid separator is reduced, and the number of connection points by welding is reduced. Therefore, the production of the gas-liquid separator becomes easy, and as a result, the production cost of the absorption air conditioner can be reduced.

[0016] The gas-liquid mixing means is arranged inside the absorber. As a result, even if air-tight leakage occurs at each connection portion of the gas-liquid mixing means, air does not enter the absorption-type refrigeration cycle because the portion where the air-tight leakage occurs is in the absorption refrigeration cycle. That is, there is no problem that air enters from the gas-liquid mixing means, and the reliability of the absorption air conditioner can be improved.

Further, the gas-liquid downcomer is disposed so as to be inserted into the connecting pipe from inside the absorber. As a result, the welding portion in the gas-liquid separator can be eliminated, and air does not enter the absorption refrigeration cycle from the gas-liquid separator. That is, also from this result, the reliability of the absorption type air conditioner can be improved.

[0018]

[Function and Effect of Claim 2] In order to remove the absorption heat generated when the vaporized refrigerant is absorbed by the absorbing liquid in the gas-liquid mixing means by cooling the gas-liquid mixing means with the cooling means. In addition, it is possible to prevent the absorption capacity of the absorbing liquid from decreasing, and to reliably absorb the vaporized refrigerant in the absorbing liquid in the gas-liquid mixing means. As a result, the vaporized refrigerant in the gas supplied to the gas-liquid separator is reliably removed, and only the non-condensable gas can be sent from the gas-liquid separator to the non-condensing tank.

[Action and Effect of Claim 3] The upper side of the gas-liquid discharge passage is provided with the gas-liquid inlet side downward. For this reason, the liquid level of the absorbing liquid supplied into the gas-liquid mixing means rises, and the absorbing liquid collectively falls through the gas-liquid discharge passage to the gas-liquid separator (siphon action), whereby the gas-liquid The gas in the mixing means is sucked into the gas-liquid discharge passage, and the sucked gas is alternately supplied with the absorbent through the gas-liquid down pipe into the connecting pipe. Then, the gas in the gas-liquid mixing means is sucked into the gas-liquid discharge passage, so that the non-condensable gas in the absorption refrigeration cycle is sucked from the gas introduction passage and guided into the gas-liquid mixing means.

That is, the non-condensable gas in the absorption refrigeration cycle can be guided to the gas-liquid separator through the gas-liquid mixing means by the siphon action. A device (for example, a pump device) for leading to the vessel becomes unnecessary, and the cost for extracting the non-condensable gas into the non-condensing tank can be reduced.

[Function and Effect of Claim 4] A part of the absorbing solution pumped from the solution pump is jetted from the nozzle. Since this nozzle injects the absorbing liquid into the Venturi pipe which opens in the non-condensing gas atmosphere, the non-condensing gas is guided into the Venturi pipe together with the absorbing liquid. Then, the absorbing liquid and the non-condensable gas guided into the Venturi pipe are guided to the connection pipe via the gas-liquid down pipe. As described above, since the gas-liquid mixing means of the present invention is constituted by the ejector using the pumping force of the solution pump, the configuration of the gas-liquid mixing means can be simplified, and the manufacturing cost can be reduced.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described based on a plurality of examples and modifications. FIG. 1 to FIG. 6 show a first embodiment, and FIG. 2 shows a schematic configuration of an absorption air conditioner using a double effect absorption refrigeration cycle for performing indoor air conditioning. FIG.

(Schematic description of absorption type air conditioner 1) The absorption type air conditioner 1 to which the present embodiment is applied is a relatively small one used for home use or the like. In this example, a heating means 2 for heating lithium bromide aqueous solution, a double effect absorption refrigeration cycle 3, and cold / hot water cooled or heated by the absorption refrigeration cycle 3 (a heat medium for cooling / heating the room; Indoor air-conditioning means 4 for air-conditioning the room with water in the embodiment, and cooling water cooling means 5 for cooling the cooling water mainly used for cooling the vaporized refrigerant (steam in this embodiment) in the absorption refrigeration cycle 3. And a control device 6 for controlling each mounted electric functional component.

(Explanation of Heating Means 2) The heating means 2 of this embodiment is a gas combustion device which burns a gas as a fuel to generate heat and heats the absorbing liquid by the generated heat. The gas burner 11 includes a gas supply unit 12 that supplies gas to the gas burner 11, a combustion fan 13 that supplies air for combustion to the gas burner 11, and the like.
Then, the heat obtained by the gas combustion of the gas burner 11 heats the boiler 14 of the absorption refrigeration cycle 3, and the boiler 14
It is provided so as to heat the low-concentration absorption liquid (hereinafter, low liquid) supplied to the inside.

(Explanation of the Absorption Refrigeration Cycle 3) The absorption refrigeration cycle 3 includes a boiler 14 heated by the heating means 2, and the low liquid supplied into the boiler 14 is heated to reduce the low liquid. A high-temperature regenerator 15 that evaporates (evaporates) a refrigerant (water) contained in the liquid into a medium-concentration absorbing liquid (hereinafter, medium liquid), and utilizes heat of condensation of the vaporized refrigerant in the high-temperature regenerator 15, A low-temperature regenerator 16 that heats an intermediate liquid supplied from the high-temperature regenerator 15 using a pressure difference, vaporizes a refrigerant contained in the intermediate liquid, and turns the intermediate liquid into a high-concentration absorbing liquid (hereinafter, high liquid). A condenser 17 for cooling and liquefying the vaporized refrigerant (steam) from the high-temperature regenerator 15 and the low-temperature regenerator 16;
An evaporator 18 for evaporating the liquefied refrigerant (water) liquefied by the condenser 17 under a pressure close to vacuum, and an absorption for absorbing the vaporized refrigerant evaporated by the evaporator 18 to the high liquid obtained by the low-temperature regenerator 16. And a vessel 19.

(Explanation of the high-temperature regenerator 15)
Is a boiler 1 for heating the low liquid by the heating means 2.
4, and a boiling cylinder 21 extending upward from the boiler 14
Is provided. The vaporized refrigerant that has been boiled in the boiler 14 and the boiling cylinder 21 and vaporized from the low liquid is blown out from the boiling cylinder 21 into the cylindrical high-temperature regeneration container 22. The high-temperature vaporized refrigerant blown into the high-temperature regeneration container 22 is
The second wall removes heat as heat of vaporization when the middle liquid in the low-temperature regenerator 16 evaporates and is cooled to become a liquefied refrigerant (water).

In the high-temperature regenerating vessel 22, the medium liquid in the boiling cylinder 21 after the refrigerant in the low liquid is vaporized by being heated by the boiler 14 and the liquefied refrigerant (water) stored in the surroundings are insulated. For this purpose, a heat insulating partition tube 24 is provided around the boiling tube 21. The heat insulating partition tube 24 has an upper end joined to the upper end of the boiling tube 21, a lower end provided with a gap from the boiling tube 21, and provided such that air enters between the boiling tube 21 and the heat insulating partition tube 24. Have been. The liquefied refrigerant (water) liquefied in the high-temperature regeneration container 22 and separated outside the heat insulating partition tube 24 is guided to the condenser 17 through a liquid refrigerant pipe 25 connected to a lower portion.

(Explanation of the low-temperature regenerator 16)
Includes a cylindrical low-temperature regeneration container 31 covering the high-temperature regeneration container 22. On the other hand, the middle liquid in the boiling cylinder 21 is supplied to the low-temperature regenerator 16 through a middle liquid pipe 26 connected to a lower part of the boiling cylinder 21. The middle liquid pipe 26 is provided with a throttle means 27 such as an orifice. This aperture means 27
When the cooling / heating switching valve 53 described later is closed, the medium flows while maintaining the pressure difference between the high-temperature regenerator 15 and the low-temperature regenerator 16. Do not shed.

The low temperature regenerator 16 injects the middle liquid supplied through the middle liquid pipe 26 toward the ceiling of the high temperature regeneration container 22. The temperature in the low temperature regeneration vessel 31 is
2, the pressure in the low temperature regeneration container 31 is lower than the pressure in the high temperature regeneration container 22. Therefore, the middle liquid supplied from the middle liquid pipe 26 into the low-temperature regeneration container 31 is easily evaporated. Then, when the middle liquid is injected into the ceiling of the high temperature regeneration container 22, the middle liquid is heated by the wall of the high temperature regeneration container 22, and a part of the refrigerant contained in the middle liquid evaporates to become a vaporized refrigerant, Becomes high liquid.

Here, the upper part of the low-temperature regenerating container 31 communicates with the upper part of the condensing container 32 in the shape of an annular container through a communicating part 33. Therefore, the vaporized refrigerant evaporated in the low-temperature regeneration container 31 is supplied into the condensation container 32 through the communication portion 33. On the other hand, the high liquid falls to the lower part of the low temperature regeneration container 31 and is supplied to the absorber 19 through the high liquid pipe 34 connected to the lower part of the low temperature regeneration container 31. In addition, the low temperature regeneration container 3
1, a ceiling plate 35 is provided.
A gap 36 through which the vaporized refrigerant passes is provided between the outer peripheral end of 5 and the low temperature regeneration container 31.

(Explanation of the Condenser 17) The condenser 17 is covered by an annular container-shaped condensing container 32. Inside the condensing container 32, a condensing heat exchanger 37 for cooling and liquefying the vaporized refrigerant in the condensing container 32 is arranged. The condensing heat exchanger 37 is an annular coil through which cooling water flows. The liquefied refrigerant supplied from the low-temperature regenerator 16 into the condensing container 32 is supplied to the condensing heat exchanger 3.
The mixture is cooled and liquefied by 7 and dropped below the condensing heat exchanger 37.

On the other hand, a refrigerant is supplied to the lower side of the condensing container 32 from the high-temperature regenerator 15 through the liquid refrigerant pipe 25. When the supplied refrigerant is supplied into the condensing container 32, the pressure difference (the pressure inside the condensing container 32 is about 70 mmHg).
From low pressure), the mixture is reboiled, and supplied in a state where the vaporized refrigerant and the liquefied refrigerant are mixed. Further, a liquid refrigerant supply pipe 38 for guiding the liquefied refrigerant to the evaporator 18 is connected to the condensation container 32. The liquid refrigerant supply pipe 38 is provided with a refrigerant valve 39 for adjusting the supply amount of the liquefied refrigerant supplied from the condensation container 32 to the evaporator 18.

(Explanation of the evaporator 18) The evaporator 18 is provided together with the absorber 19 at the lower part of the condensing container 32. The evaporator 18 is constituted by an annular-shaped evaporative absorption container 41 provided around the low temperature regeneration container 31. Covered. An evaporation heat exchanger 42 for evaporating the liquefied refrigerant supplied from the condenser 17 is disposed outside the inside of the evaporation absorption container 41. This evaporating heat exchanger 42 is an annular coil,
Cold and hot water (heat medium) supplied to the indoor air-conditioning means 4 inside
Flows. The liquefied refrigerant supplied from the condenser 17 via the liquid refrigerant supply pipe 38 is sprayed onto the evaporating heat exchanger 42 from an annular refrigerant spraying tool 43 disposed above the evaporating heat exchanger 42. Is done.

Since the inside of the evaporative absorption container 41 is kept substantially at a vacuum (for example, 6.5 mmHg), it has a low boiling point, and the liquefied refrigerant sprayed to the evaporating heat exchanger 42 is very easy to evaporate. The liquefied refrigerant sprayed on the evaporating heat exchanger 42 evaporates by removing heat of vaporization from the heat medium flowing in the evaporating heat exchanger 42. As a result, the heat medium flowing in the evaporating heat exchanger 42 is cooled. Then, the cooled heat medium is guided to the indoor air conditioner 4 to cool the room.

(Explanation of the Absorber 19) The absorber 19 is covered with the evaporation absorption container 41 as described above. The absorber 19 is provided inside the evaporative absorption container 41 with the high liquid pipe 3.
An absorption heat exchanger 44 for cooling the high liquid supplied from 4 is arranged. The heat exchanger 44 for absorption is an annular coil, and the inside thereof is supplied with cooling water for cooling the high liquid sprayed on the coil. After passing through the heat exchanger 44 for absorption, the cooling water passes through the heat exchanger 37 for condensation of the condenser 17 and is guided to the cooling water cooling means 5 to be cooled. Then, the cooling water cooled by the cooling water cooling means 5 is guided again to the absorption heat exchanger 44.

On the other hand, above the absorption heat exchanger 44, there is disposed an annular absorbent dispersion device 45 for dispersing the high liquid supplied from the high liquid pipe 34 to the absorption heat exchanger 44. The high liquid sprayed on the absorption heat exchanger 44, while traveling down the coil surface of the absorption heat exchanger 44 and falling from above to below, removes the vaporized refrigerant generated by evaporation in the evaporation heat exchanger 42. Absorb. As a result, the absorption liquid that has fallen to the bottom of the evaporative absorption container 41 becomes a low concentration liquid with a low concentration.

Inside the evaporative absorption container 41, between the evaporating heat exchanger 42 and the absorbing heat exchanger 44, a cylindrical partition wall 4 is provided.
6 are arranged. The cylindrical partition wall 46 communicates with the inside of the evaporation absorption container 41 only at the upper side, and the vaporized refrigerant generated by the evaporator 18 is guided into the absorber 19 through the upper part of the cylindrical partition wall 46. .

A low liquid pipe 47 for supplying the low liquid at the bottom of the evaporative absorption container 41 to the boiler 14 is connected to the bottom of the evaporative absorption container 41. The low liquid pipe 47 is provided with a solution pump 48 for flowing the low liquid from the inside of the evaporation absorption container 41 in a substantially vacuum state toward the boiler 14.

(Explanation of Other Components in Absorption Refrigeration Cycle 3) Reference numeral 51 shown in FIG.
A high-temperature heat exchanger 51 for exchanging heat between the medium liquid flowing from the inside to the low-temperature regenerator 16 and the low liquid flowing from the absorber 19 to the boiler 14.
a, and a low-temperature heat exchanger 51b for exchanging heat between the high liquid flowing from the low-temperature regenerator 16 to the absorber 19 and the low liquid flowing from the absorber 19 to the boiler 14. The high-temperature heat exchanger 51a cools the middle liquid flowing from the boiling cylinder 21 to the low-temperature regenerator 16 and heats the low liquid flowing from the absorber 19 to the boiler 14. The low-temperature heat exchanger 51b cools the high liquid flowing from the low-temperature regenerator 16 to the absorber 19 and heats the low liquid flowing from the absorber 19 to the boiler 14.

The absorption refrigeration cycle 3 of this embodiment is provided with heating operation means for performing a heating operation in addition to the cooling operation by the above-described operation. The heating operation means includes a heating pipe 52 for guiding the high-temperature absorbing liquid from the lower part of the boiling cylinder 21 to a lower part of the evaporator 18, and a cooling / heating switching valve 53 for opening and closing the heating pipe 52. The cooling / heating switching valve 53 opens during the heating operation to guide the high-temperature absorbing liquid into the evaporating / absorbing container 41 and heat the cold / hot water flowing in the evaporating heat exchanger 42 of the evaporator 18.

(Description of Indoor Air Conditioning Means 4)
Is forcibly exchanging heat between the cold and hot water passing through the indoor heat exchanger 54 installed in the room and the evaporator 18 flowing through the indoor heat exchanger 54 and the room air, and blowing the air after the heat exchange into the room. And an indoor fan 55 for causing the indoor fan 55 to operate.

A cold / hot water circuit 56 for circulating cold / hot water is connected to the indoor heat exchanger 54. The cold / hot water circuit 56 is provided with a cold / hot water pump 57 for circulating cold / hot water. The cold / hot water pump 57 is driven by a motor that also drives the solution pump 48.

The cold / hot water circuit 56 is a water pipe that guides the cold / hot water that has passed through the evaporator 18 to the indoor heat exchanger 54 and guides the cold / hot water that has exchanged heat with the room air to the evaporator 18 again. Inside, the indoor heat exchanger 54 and the cold / hot water pump 57
In addition, a cistern 58 for storing cold / hot water and replenishing cold / hot water in the cold / hot water circuit 56 is provided while functioning as an expansion tank for heating.

A water supply pipe 59 for supplying cold / hot water (tap water) to the inside is connected to the cistern 58. In this water supply pipe 59, supply of cold and hot water into the cistern 58,
A water supply valve 60 for stopping is provided. The cistern 58 includes a water level sensor (not shown).
To open and refill the cistern 58 with cold and hot water. Further, the cistern 58 is provided with overflow water supply means 59a for guiding the overflowed cold / hot water into a cooling water tank 65 described later.

(Description of Cooling Water Cooling Means 5) The cooling water cooling means 5 includes an evaporative cooling tower 61, a cooling water circuit 62 for circulating cooling water, and a cooling water pump for circulating cooling water in the cooling water circuit 62. 63 is provided. The cooling tower 61 includes the absorber 1
The cooling water that has passed through the condenser 9 and the condenser 17 flows downward from above, exchanges heat with the outside air while flowing to radiate heat, and partially evaporates during the flow, thereby cooling during the evaporation. A spraying unit 61 for removing vaporization heat from water and cooling the flowing cooling water, and spraying the cooling water upward.
a, an evaporator 61b having a large surface area through which the cooling water flows, and a collector 61c for collecting the cooling water passing through the evaporator 61b
It is composed of In addition, the cooling tower 61 includes an evaporator 6
1b is provided with a cooling water fan 64 for generating an air flow and promoting the evaporation and cooling of the cooling water in the evaporating section 61b.

The cooling water circuit 62 passes the cooling water, which has passed through the absorber 19 and the condenser 17 and has risen in temperature, to the cooling tower 6.
1 and sends the cooling water cooled by the cooling tower 61 to the absorber 19 and the condenser 17 again. In the cooling water circuit 62, in addition to the cooling tower 61 and the cooling water pump 63,
A cooling water tank 65 for storing cooling water is provided.

The cooling water tank 65 is installed below the cooling tower 61 and below the cistern 58.
The cooling water passing through 1 is supplied, and the water overflowing in the cistern 58 is supplied. The cooling water tank 65 is provided with a water level sensor (not shown). When the level of the cooling water in the cooling water tank 65 decreases, the water supply valve 60 is opened to overflow the water from the cistern 58, and the overflowed water is supplied to the overflow water supply means. 59
The cooling water is supplied to the inside of the cooling water tank 65 from a.

(Explanation of the control device 6) The control device 6 includes the above-described refrigerant valve 39, solution pump 48 (cold and hot water pump 57),
Electric functional parts such as the indoor fan 55, the cooling / heating switching valve 53, the water supply valve 60, the cooling water pump 63, the cooling water fan 64, and the electric functional parts of the heating means 2 (combustion fan 1
3. Gas control valve 66, gas on-off valve 67, ignition device 68
) Is controlled in accordance with an operation instruction of a controller (not shown) manually set by a user or an input signal of each of a plurality of sensors.

(Explanation of the bleeding device 70) Absorption type air conditioner 1
As shown in FIG. 1, a gas extraction device 70 is provided for extracting and storing non-condensable gas such as hydrogen generated by corrosion in the absorption refrigeration cycle 3 from the absorption refrigeration cycle 3. The bleeding device 70 mainly includes an auxiliary absorber 71 (corresponding to a gas-liquid mixing unit) utilizing a siphon action for causing the non-condensable gas and the absorption liquid extracted from the absorption refrigeration cycle 3 to flow alternately. It comprises a gas-liquid separator 72 for separating the non-condensable gas supplied from the auxiliary absorber 71 from the absorbent, and a non-condensable gas tank 73 for storing the non-condensable gas separated by the gas-liquid separator 72.

The auxiliary absorber 71 is arranged in the absorber 19, and is a non-condensable gas in the absorption refrigeration cycle 3 (in this embodiment, a non-condensable gas accumulated in a lower portion of the absorber 19).
A gas introduction passage 74 for introducing the liquid is connected, and an absorption liquid introduction passage 75 for introducing the high liquid (absorption liquid) supplied to the absorption liquid spraying tool 45 is connected. Gas-liquid discharge passage 76 for allowing
Is connected.

The auxiliary absorber 71 is also shown in FIGS. 3 to 5 and has a flat shape provided by combining two press-formed plates 71a. Pumping pipe 7 constituting liquid discharge passage 76
6a is brazed together with the two press-formed plates 71a while being sandwiched between the two press-formed plates 71a.

As shown in FIG. 6, the absorption liquid introduction passage 75 has an auxiliary absorber 71 connected through an orifice 75c having an upper end joined to the absorbent sprayer 45 and a lower end joined to the end.
Is fitted into a funnel-shaped connection port 75b (see FIGS. 3 and 4) provided at the upper end of the.

As shown in FIGS. 3 and 4, the two press-formed plates 71a are combined to form an auxiliary absorber 71 into which a non-condensable gas containing a vaporized refrigerant and a high liquid (absorbent) are introduced. Is formed, and a gas passage 7 that guides the gas supplied from the lower bleed pipe 74 a to above the auxiliary absorber 71.
4b (communicating with the gas introduction passage 74), connection port 74c
(See FIG. 5), and a funnel-shaped connection port 75b for receiving a drop of high liquid from the absorbing liquid introduction passage 75 is formed.

The two press-formed plates 71a are provided with an inverted substantially U-shaped gas-liquid suction passage 76b whose both ends are directed downward. This gas-liquid suction passage 76b
Is a gas-liquid discharge passage 76 formed by connecting a hanging pumping pipe 76a to a connection port 76d (see FIG. 5) at one end, and a gas-liquid suction port at the other end that opens inside the auxiliary absorber 71. The side 76c is provided downward.

Therefore, when the liquid level of the absorbing liquid in the auxiliary absorber 71 rises and reaches the liquid level at the upper end of the gas-liquid suction passage 76b, the absorbing liquid is united by the siphon action to form the gas-liquid discharging passage 76. Through the gas-liquid separator 72. At this time, the gas in the auxiliary absorber 71 is sucked into the gas-liquid discharge passage 76. Then, the gas in the auxiliary absorber 71 is sucked into the gas-liquid discharge passage 76, so that the absorber 19
The non-condensable gas accumulated in the lower part of the gas is sucked into the auxiliary absorber 71 via the gas introduction passage 74 and the gas passage 74b.

Further, the auxiliary absorber 71 removes the heat of absorption generated when the vaporized refrigerant introduced together with the non-condensable gas is absorbed by the absorbing liquid, and prevents the absorption capacity from lowering. A cooling means for cooling the vessel 71 is provided. The cooling means of the present embodiment is a cooling water pipe 77 branched from the absorption heat exchanger 44 through which the cooling water flows, and the cooling water is supplied to the auxiliary absorber 71 formed by the two press-formed plates 71a. A groove 71b (see FIG. 4) into which the pipe 77 is fitted is formed, and the cooling water pipe 77 is brazed in the groove 71b. The brazing of the cooling water pipe 77 is performed by brazing integrally with the two press-formed plates 71a, the bleeding pipe 74a forming the gas introduction passage 74, and the pumping pipe 76a forming the gas-liquid discharge passage 76. . The cooling water pipe 77 is connected to the absorption heat exchanger 44 again.
To join.

(Description of Non-Condensable Gas Tank 73) The non-condensable gas tank 73 is a container disposed outside the absorption refrigeration cycle 3 as shown in FIG. ing. The non-condensing gas tank 7
3 is provided with a maintenance valve (not shown), through which non-condensable gas is extracted at a predetermined time.

(Description of gas-liquid separator 72) Gas-liquid separator 72
As shown in FIG. 1, is disposed below the auxiliary absorber 71 and the non-condensable gas tank 73, separates the gas flowing out of the gas-liquid discharge passage 76 from the absorbing liquid, and separates the separated gas into a gas discharge passage 78a. Through the non-condensable gas tank 73,
The separated absorbent is returned into the absorber 19 of the absorption refrigeration cycle via the absorbent return passage 78b.

Specifically, the gas-liquid separator 72 is connected to the absorber 1
9 and the lower part of the non-condensable gas tank 73,
9, a large-diameter round tubular connection pipe 78 connecting the lower part of the non-condensable gas tank 73 and the lower part of the non-condensable gas tank 73; From the small-diameter round tubular gas-liquid descending pipe 79 that guides the non-condensable gas and the absorbing liquid flowing out of the absorber 71 through the gas-liquid discharge passage 76 to a portion rising toward the non-condensing gas tank 73 in the connection pipe 78. In this embodiment, a pumping pipe 76a of the gas-liquid discharge passage 76 is provided.
The gas-liquid down pipe 79 is provided by one pipe. Note that the pumping tube 76a and the gas-liquid downcoming tube 79 may be provided separately and connected in the absorber 19 or the connection tube 78.

The connecting pipe 78 and the gas-liquid descending pipe 79 are formed in a U-shape after being arranged in a double manner.
The liquid level of the absorbing liquid in the connection pipe 78 has the same liquid level as that of the low liquid in the absorber 19, and the upper side from the liquid level is a gas discharge passage 78 a that guides gas to the non-condensable gas tank 73, and the lower side is It serves as an absorbent return passage 78b for returning the absorbent to the absorber 19.

As described above, the open end of the gas-liquid downcomer 79 is set at a portion that rises toward the non-condensable gas tank 73 in the connection tube 78. For this reason, the non-condensable gas discharged from the gas-liquid down pipe 79 rises in the absorbent and is separated from the absorbent, and is guided to the non-condensable gas tank 73 through the gas discharge passage 78a. In this embodiment,
Although the opening end of the gas-liquid downcomer 79 is set below the liquid level,
It may be set upward. However, in order to smoothly perform the siphon action of the auxiliary absorber 71, the head difference is large, so that the lower part is better.

Further, the absorbing liquid discharged from the gas-liquid downcomer 79 acts to make the liquid level in the absorber 19 equal to the liquid level in the gas discharge passage 78a, so that the absorbing liquid moves. Thereby, it is returned to the absorber 19. In addition, by making the tip 78c of the absorbent return passage 78b protrude from the bottom of the absorber 19, it is possible to prevent dust or the like from flowing into the connection pipe 78.

[Operation of First Embodiment] Next, the operation of the cooling operation of the absorption type air conditioner 1 and the operation of the air extraction device 70 when performing the cooling operation will be described. (Explanation of the operation of the cooling operation) When the absorption air conditioner 1 is started, the heating means 2 and the absorption refrigeration cycle 3 are operated by the operation of the electric functional components. Absorption refrigeration cycle 3
In other words, when the heating means 2 heats the boiler 14, the high-temperature regenerator 15 takes out the vaporized refrigerant from the low liquid, and the low-temperature regenerator 16 takes out the high liquid from the middle liquid.

The vaporized refrigerant taken out by the high-temperature regenerator 15 and the low-temperature regenerator 16 is condensed and liquefied by the condenser 17 and then dispersed to the evaporator heat exchanger 42 of the evaporator 18 to be evaporated. The heat of vaporization is taken from the cold and hot water in 42 to evaporate. Therefore, the cooled hot and cold water that has passed through the evaporating heat exchanger 42 and is cooled is supplied to the indoor heat exchanger 54 of the indoor air conditioner 4 to cool the room.

The vaporized refrigerant evaporated in the evaporator 18 passes above the cylindrical partition wall 46 and flows into the absorber 19.
On the other hand, in the absorber 19, the high liquid taken out by the low-temperature regenerator 16 is dispersed to the absorption heat exchanger 44, and the high liquid absorbs the vaporized refrigerant flowing from the evaporator 18. Note that the absorption heat generated when the vaporized refrigerant is absorbed by the high liquid is absorbed by the absorption heat exchanger 44, thereby preventing the absorption capacity from lowering. The high liquid that has absorbed the vaporized refrigerant in the absorber 19 becomes a low liquid, is sucked by the solution pump 48, is returned into the evaporator 14, and repeats the above cycle.

(Explanation of the operation of the air extraction device 70) During the cooling operation by the absorption refrigeration cycle 3, since the vaporized refrigerant is absorbed by the high liquid, the inside of the absorber 19 is in a negative pressure state as compared with the inside of the evaporator 18. When the vaporized refrigerant evaporated in the evaporator 18 passes above the cylindrical partition wall 46 and flows into the absorber 19, as shown in FIG.
An airflow indicated by arrow A is generated. On the other hand, in the absorption refrigeration cycle 3, the corrosion is slightly generated due to the action of the highly corrosive absorbing liquid, and non-condensable gas is generated. Then, the generated non-condensable gas is stored in a lower portion of the absorber 19 by an air current shown by an arrow A in FIG.

During the operation of the absorption refrigeration cycle 3, a part of the high liquid supplied to the absorption liquid sprayer 45 is supplied from the liquid pipe 75a constituting the absorption liquid introduction passage 75 to the auxiliary absorber 71 through the orifice 75c. Supplied within. Then, the liquid level of the high liquid in the auxiliary absorber 71 gradually rises. When the liquid surface of the high liquid reaches the top of the gas-liquid suction passage 76b, the high liquid flows into the gas-liquid discharge passage 76, and the liquid surface of the high liquid
It falls down from the pumping tube 76a until it falls to the upper end of 6c. By the action of the high liquid dropping down the pumping tube 76a, the gas in the auxiliary absorber 71 is released from the gas-liquid discharge passage 7
6 (gas-liquid suction passage 76b), and at the next drop of the high liquid, passes through the gas-liquid down pipe 79 together with the high liquid.
Of the connecting pipe 78, the liquid is discharged into the absorbing liquid inside the connecting pipe 78 rising toward the non-condensable gas tank 73.

As a result, the non-condensable gas discharged from the gas-liquid downcomer 79 rises in the absorbing solution and is separated from the absorbing solution.
The upper non-condensable gas tank 7 via the gas discharge passage 78a
It is led into 3. In addition, since the absorbing liquid discharged from the gas-liquid down pipe 79 works so that the liquid level in the connection pipe 78 and the liquid level in the absorber 19 become the same, non-condensation by the absorbing liquid discharged from the gas-liquid down pipe 79 is performed. It is returned to the absorber 19 by the increase of the absorbing liquid inside the connection pipe 78 on the side rising toward the gas tank 73. On the other hand, when the gas in the auxiliary absorber 71 is sucked into the gas-liquid discharge passage 76, the non-condensable gas accumulated in the lower part of the absorber 19 is sucked into the auxiliary absorber 71 from the gas introduction passage 74.

[Effects of the First Embodiment] The gas-liquid separator 72 of the bleeding device 70 includes a gas discharge passage 78a and an absorbent return passage 7
8b is a common connection pipe 78, and the connection pipe 78 fulfills the function of a conventional separation vessel. For this reason, the formation of the separation container becomes unnecessary, and the connection between the gas discharge passage 78a and the absorbent return passage 78b becomes unnecessary. The gas-liquid downcomer 7
9 is disposed so as to be inserted into the connection pipe 78 from the inside of the absorber 19, so that a welding portion in the gas-liquid separator 72 can be eliminated.

As a result, in the gas-liquid separator 72, the number of parts is greatly reduced as compared with the prior art, and the number of welding points can be reduced to zero, so that the cost required for the gas-liquid separator 72 can be kept very low. As a result, the absorption type air conditioner 1
Costs can be kept low. Further, since there is no welding portion in the gas-liquid separator 72, no air enters the absorption refrigeration cycle 3 from the gas-liquid separator 72, and the reliability of the absorption air conditioner can be improved.

Since the auxiliary absorber 71 is disposed inside the absorber 19, even if air-tight leakage occurs at each joint of the auxiliary absorber 71, air enters the absorption refrigeration cycle. Does not occur. That is, there is no problem that air enters from the auxiliary absorber 71, and the reliability of the absorption air conditioner 1 can be improved.

By cooling the auxiliary absorber 71 with the cooling water pipe 77, the heat of absorption generated when the vaporized refrigerant is absorbed by the absorbing liquid in the auxiliary absorber 71 is removed, thereby preventing the absorption capacity from lowering. Therefore, the vaporized refrigerant can be reliably absorbed by the absorbing liquid in the auxiliary absorber 71. As a result, the vaporized refrigerant in the gas supplied to the gas-liquid separator 72 is reliably removed, and only the non-condensable gas can be sent from the gas-liquid separator 72 to the non-condensable gas tank 73. This makes it possible to delay the time when the non-condensable gas tank 73 is full, to reduce the frequency of degassing work from the non-condensable gas tank 73, and to improve the ability to convey the non-condensable gas.

The auxiliary absorber 71 is connected to two press-formed plates 71
Since it is provided flat along with a, it is possible to avoid an increase in the volume of the absorber 19 accommodating the auxiliary absorber 71. Gas-liquid suction passage 76b provided upstream of gas-liquid discharge passage 76
The non-condensable gas in the auxiliary absorber 71 is supplied to the gas-liquid separator 72 by the siphon action of
The non-condensable gas therein can be guided into the auxiliary absorber 71 via the gas introduction passage 74. Therefore, a device (for example, a pump device) for guiding the non-condensable gas in the absorption refrigeration cycle to the auxiliary absorber 71 and the gas-liquid separator 72 becomes unnecessary, and the non-condensable gas is extracted to the non-condensable gas tank 73. Costs can be kept low.

[Second Embodiment] FIG. 7 is a schematic configuration diagram of a bleed device 70 according to a second embodiment. In the above-described first embodiment, as an example of the gas-liquid mixing unit, the auxiliary absorber 71 that causes the high-liquid absorbing liquid and the non-condensable gas to flow alternately by the high-liquid siphon action is described. The gas-liquid mixing means of the second embodiment uses an ejector 80 that utilizes the injection of the absorbing liquid pumped from the solution pump 48 instead of the siphon action of the first embodiment.

The ejector 80 is provided with a venturi tube 8 opening at the lower part of the absorber 19 so as to suck in the non-condensable gas accumulated at the lower part of the absorber 19 by the airflow indicated by the arrow A.
1 and a part of the absorbing solution pumped from the solution pump 48,
A nozzle 82 for jetting into the venturi tube 81, and a low liquid pipe 47a for an ejector branched from the low liquid pipe 47 for guiding a part of the absorbing liquid to be pumped by the solution pump 48 to the nozzle 82. .

The Venturi tube 81 is sucked into the Venturi tube 81 together with the non-condensable gas injected from the opening of the Venturi tube 81 by the jetting force of the absorbing liquid jetted from the nozzle 82. Venturi tube 81
Is connected to the upper end of a gas-liquid down pipe 79 constituting the gas-liquid separator 72, and the non-condensable gas sucked into the venturi pipe 81 is connected to the connection pipe 78 via the gas-liquid down pipe 79 together with the absorbing liquid. Into the gas discharge passage 78a.

As a result, the non-condensable gas discharged from the gas-liquid downcomer 79 rises in the absorbing solution and is separated from the absorbing solution.
The upper non-condensable gas tank 7 via the gas discharge passage 78a
It is led into 3. Note that the absorbing liquid discharged from the gas-liquid down pipe 79 works so that the inside of the connecting pipe 78 has the same liquid level in the absorber 19, so that the connecting pipe due to the absorbing liquid discharged from the gas-liquid down pipe 79. It is returned to the absorber 19 by the increase of the absorbing liquid inside 78. Ejector 80 of the second embodiment
Is configured with a simpler structure than the auxiliary absorber 71 of the first embodiment, so that the cost of the gas-liquid mixing means can be reduced as compared with the first embodiment.

[0079]

[0080]

[0081]

[0082]

[Modification] In the above embodiment, the auxiliary absorber 71 is formed by joining two press-formed plates 71a. However, the auxiliary absorber 71 is formed of another container such as a tube or a box. May be.

In the above embodiment, the cooling water pipe 77 diverted from the absorption heat exchanger 44 is used as an example of the cooling means. However, another cold member is brought into contact with the auxiliary absorber 71 or the like to reduce the absorbed heat. It may be provided to take away. In the above embodiment, the cooling means is provided to cool the central portion of the auxiliary absorber 71. However, the cooling means may be brought into contact with the end of the press-formed plate 71a for cooling.

In the above embodiment, the non-condensable gas is
Although the example in which the gas inlet passage 74 is provided so as to accumulate at the lower portion of the gas inlet 9 and the gas suction passage 74 is provided at the lower portion of the absorber 19 is shown, the non-condensable gas is supplied to another portion (for example, the upper portion of the absorber). It may be provided so as to store the gas, and an opening for sucking the gas in the gas introduction passage 74 may be provided in a portion where the non-condensable gas is stored.

In the above embodiment, the brazing of the bleeding pipe 74a and the pumping pipe 76a was performed when the press-formed plate 71a was brazed. However, the liquid pipe 75a may also be brazed. In addition, the bleed pipe 74a and the pumping pipe 7
6a may be simply fitted into the auxiliary absorber 71. Also,
The liquid tube 75a may be caulked and joined to the auxiliary absorber 71.

In the above embodiment, the double-effect absorption refrigeration cycle 3 has been described as an example of the absorption-type refrigeration cycle. However, a single-effect absorption refrigeration cycle may be used.
A triple effect or more multi-effect absorption refrigeration cycle may be used.
In addition, when the middle liquid is injected into the low-temperature regenerator 16, the example has been described in which the medium is injected from above the low-temperature regenerator 16, but may be injected from below.

As a heating source of the heating means 2, a gas burner 11
However, an oil burner or an electric heater may be used, or exhaust heat of another device (for example, an internal combustion engine) may be used. Although the example in which the heat exchanger for condensation 37, the heat exchanger for evaporation 42, and the heat exchanger for absorption 44 are provided in a coil shape has been described, other types of heat exchangers such as a tube and fin or a stacked heat exchanger are used. May be used.

Although an aqueous solution of lithium bromide has been described as an example of the absorbing liquid, other absorbing liquids such as an aqueous ammonia solution using ammonia as a refrigerant and water as an absorbent may be used. As an example of the heat medium, tap water is used and shared with the cooling water in the cooling water circuit. However, other heat medium such as antifreeze or oil different from the cooling water in the cooling water circuit may be used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a bleed device (first embodiment).

FIG. 2 is a schematic configuration diagram of an absorption type air conditioner (first embodiment).

FIG. 3 is a side view of the auxiliary absorber (first embodiment).

FIG. 4 is a top view of the auxiliary absorber (first embodiment).

FIG. 5 is a perspective view of a main part of the auxiliary absorber (first embodiment).

FIG. 6 is a cross-sectional view of a main part showing a joint state between the absorbing liquid introduction passage and the absorbing liquid spraying device (first embodiment).

FIG. 7 is a schematic configuration diagram of a bleed device (second embodiment).

FIG. 8 is a sectional view of a gas-liquid separator (prior art).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Absorption air conditioner 2 Heating means 3 Absorption refrigeration cycle 15 High temperature regenerator 16 Low temperature regenerator 17 Condenser 18 Evaporator 19 Absorber 48 Solution pump 70 Bleed device 71 Auxiliary absorber 72 Gas-liquid separator 73 Non-condensing gas tank 74 Gas introduction passage 75 Absorption liquid introduction passage 76 Gas-liquid discharge passage 76b Gas-liquid suction passage 76c Gas-liquid suction port 77 Cooling water pipe (cooling means) 78 Connection pipe 79 Gas-liquid downcoming pipe 80 Ejector 81 Venturi pipe 82 Nozzle

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-108974 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 43/04

Claims (4)

(57) [Claims] A) a heating means for heating the absorbing liquid; b) a regenerator for heating the absorbing liquid with the heating means to vaporize a part of the absorbing liquid; and cooling the vaporized refrigerant generated in the regenerator. A condenser that liquefies and evaporates the liquefied refrigerant liquefied by the condenser under a low pressure; an absorber that absorbs the vaporized refrigerant evaporated by the evaporator into an absorbing liquid; An absorption refrigeration cycle having a solution pump for pumping to a regenerator; and c) introducing non-condensable gas in the absorption refrigeration cycle and introducing a part of the absorption liquid of the absorption refrigeration cycle. Gas-liquid mixing means for flowing out the non-condensable gas and the absorbing liquid, d) a non-condensable gas tank for storing the non-condensable gas, and e) the non-condensable gas and the absorbing liquid flowing out of the gas-liquid mixing means are led to With non-condensable gas A gas-liquid separator that separates the absorbent from the absorbent, guides the separated non-condensable gas to the non-condensable gas tank, and guides the separated absorbent into the absorption refrigeration cycle. A separator is disposed below the absorber and the non-condensable gas tank, and a connection pipe that connects the inside of the absorber and the non-condensable gas tank; and a non-condensable gas and an absorbent that flow out of the gas-liquid mixing unit. A gas-liquid downcomer that leads to a portion that rises toward the non-condensable gas tank in the connection pipe , wherein the gas-liquid mixing means is disposed inside the absorber, and the gas-liquid downcomer is From inside the absorber to inside the connection pipe
An absorption type air conditioner, wherein the absorption type air conditioner is disposed so as to be inserted into the air conditioner. 2. The absorption type air conditioner according to claim 1 , wherein the gas-liquid mixing means is cooled by a cooling means, and is generated when the vaporized refrigerant introduced into the inside together with the non-condensable gas is absorbed by the absorption liquid. An absorption type air conditioner characterized by removing absorbed heat. 3. The gas-liquid mixing device according to claim 1 , wherein the gas-liquid discharging passage for guiding the non-condensable gas and the absorbing liquid from the gas-liquid mixing device to the gas-liquid downcomer is provided. In order to drop the absorbing liquid introduced therein, the gas-liquid mixing means is provided so as to hang down from the gas-liquid mixing means, and the gas-liquid suction port side for sucking the absorbing liquid and the non-condensable gas in the gas-liquid mixing means is directed downward. The non-condensable gas in the gas-liquid mixing means is sucked into the gas-liquid discharge passage from the gas-liquid suction port by the action of the absorbing liquid falling from the gas-liquid discharge passage to the gas-liquid separator. Absorption type air conditioner characterized by being performed. 4. The absorption air conditioner according to claim 1 , wherein said gas-liquid mixing means includes a venturi pipe opened in a non-condensable gas atmosphere of said absorption refrigeration cycle, and an absorption liquid pumped from said solution pump. An absorption type air conditioner, wherein an uncondensed gas sucked together with an absorbing liquid in the venturi tube is guided to the gas-liquid downcomer by an ejector partially provided with a nozzle for injecting into the venturi tube.