JPH086209Y2 - Solution pump for absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a solution pump for an absorption refrigerator.

[Conventional technology]

Absorber, evaporator, condenser, regenerator, solution heat exchanger,
Absorption refrigeration consisting of a solution pump that sends a solution from an absorber to a regenerator via a solution heat exchanger, and a refrigerant pump that sends a refrigerant from the absorber to an evaporator, using a crystalline solution such as an aqueous solution of lithium bromide and water as the refrigerant. In a machine, a solution pump that is usually used is a sealed electric motor drive type, and a self-cooling and self-lubricating method is used in which a part of the solution pressurized by the pump is used for cooling the electric motor and lubricating the bearing.

Therefore, when a solution pump is installed in a concentrated solution system in which the concentrated solution is guided from the regenerator to the absorber, in the conventional pump, a part of the pressurized solution is used for cooling the electric motor and lubricating the bearing. However, in a place with a small gap, the flow may cause stagnation, and heat dissipation to the surroundings may easily lower the temperature of the solution.In this case, concentrated solution may cause crystals to form in the solution, and as a result, rotation of the motor is hindered. Then, there is a problem that the solution pump cannot be operated.

[Problems to be solved by the device]

The present invention has been proposed in view of such circumstances, and it is possible to sufficiently pressurize the concentrated solution while cooling the motor and lubricating the bearing without the solution crystallizing in the gaps inside the motor and the bearing. It is an object of the present invention to provide a solution pump for an absorption refrigerating machine.

[Means for solving the problem]

To this end, the present invention is directed to an absorption refrigerator that uses a crystalline solution such as an aqueous solution of lithium bromide and water as a refrigerant, which is composed of an absorber, an evaporator, a condenser, a regenerator, a solution heat exchanger, a solution pump, and a refrigerant pump. , A concentrated solution is provided from the regenerator to the absorber, and a solution pump is provided in the concentrated solution piping system for facilitating the flow of the concentrated solution, and the solution pump sends the dilute solution from the absorber to the regenerator. The pump is connected to the same electric motor as the solution pump, and holes are made in the partition plate between the electric motor and the pump on the dilute solution side and on the impeller of the pump, and on the impeller of the electric motor shaft or the concentrated solution side pump. It is characterized in that a hole is bored and only the diluted solution whose pressure is increased by the pump on the diluted solution side is provided for cooling the electric motor and lubricating the bearing portion.

[Action]

In the solution pump for absorption chiller of the present invention, the concentrated solution pump that sends the concentrated solution from the regenerator to the absorber and the diluted solution pump that sends the diluted solution from the absorber to the regenerator are driven by the same electric motor, and Cooling and lubrication of the bearing are performed by using only a part of the diluted solution that is boosted by the diluted solution pump. Therefore, while the solution cools and lubricates the motor without crystallizing in the gap between the inside of the motor and the bearing, The concentrated solution pump can be operated.

〔Example〕

An embodiment of the solution pump for an absorption refrigerator according to the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view of the first embodiment, FIG. 2 is a vertical sectional view of the second embodiment, and FIG. It is a systematic diagram of the direct-heating absorption refrigerator which installed the solution pump.

First, a direct-fired absorption refrigerator equipped with the solution pump shown in FIGS. 1 and 2 will be described with reference to FIG.
The evaporator 2, the condenser 3, the low pressure regenerator 4, the high pressure regenerator 5, the low temperature side solution heat exchanger 6 and the high temperature side solution heat exchanger 7 are respectively arranged in a predetermined positional relationship, and a lithium bromide aqueous solution is provided. A high-pressure regenerator 5 which is connected in a predetermined mutual relationship by a piping system of an absorbent composed of a solution and a piping system of a refrigerant composed of water, and which is connected from the absorber 1 via the solution heat exchangers 6 and 7. A dilute solution pump 8 is installed in the piping system leading to the above, and a concentrated solution pump 9 is installed in the concentrated solution piping system leading from the low pressure regenerator 4 to the absorber 1 through the solution heat exchanger 6 and both pumps 8 , 9 are commonly connected to the same solution pump electric motor 10, and details thereof will be described later with reference to FIGS. 1 and 2. A refrigerant pump 11 is installed in the refrigerant piping system that leads from the absorber 1 to the evaporator 2.

Next, details of the dilute solution pump 8 and the concentrated solution pump 9 commonly connected to the same solution pump electric motor 10 will be described with reference to FIGS. 1 and 2.

In FIG. 1 of the first embodiment, in this example, a dilute solution pump 8 and a concentrated solution pump 9 are connected to one end of a solution pump electric motor 10, and a rotor housed inside a stator 12 of the electric motor 10. A shaft 14 of 13 is supported by bearings 15 and 16 at both ends, and is extended to the left side, and a dilute solution pump impeller 17 and a concentrated solution pump impeller 18 are attached to the extended portion, and an electric motor 10 and a dilute solution are also provided. Partition plate between pump 8
19, Partition plate 20 and seal ring between both solution pumps 8 and 9
20a are installed respectively. Further, a hole 21 that opens from the right end to the inner edge of the seal ring 20a is formed in the shaft center of the shaft 14, and the partition plate 19 has a hole 22 and a dilute solution pump impeller 17
Holes 23 are formed in each.

In such a device, a part of the diluted solution whose pressure is increased by the diluted solution pump 8 flows into the electric motor 10 side through the hole 22 of the partition plate 19. Here, it is divided into two directions, one of which flows into the bearing 15 on the left side and goes out to the side of the dilute solution pump 8 while lubricating the bearing 15, and then from the hole 23 of the dilute solution pump impeller 17 to the dilute solution pump 8. Return to the suction section of.

The other one flows to the right side while cooling the gap between the rotor 13 and the stator 12 of the electric motor 10, and then flows into the bearing 16 on the right side to lubricate the bearing 16 and then enters the hole 21 of the shaft 14 from the right end. It is guided to the gap between the seal ring 20a and the shaft 14.

The pressure of the dilute solution flowing through the system passage is slightly lower than the discharge portion pressure of the dilute solution pump 8 due to the resistance of the passage, but the right end of the seal ring 20a is the suction portion of the dilute solution pump 8 and the left end is It is the suction part of the concentrated solution pump 9, and normally the pressure of these suction parts is low, so the dilute solution flowing through the hole 21 in the shaft 14 flows into the gap of this seal ring 20a due to the differential pressure, and the concentrated solution is Prevent it from flowing into the gap. A part of the diluted solution introduced here flows to the right side and returns to the suction section of the diluted solution pump 8, and the diluted solution flowed to the left side flows into the suction section of the concentrated solution pump 9.

Next, referring to FIG. 2 of the second embodiment, in this example, a dilute solution pump 8 and a concentrated solution pump 9 are connected to both shaft ends of a solution pump electric motor 10, respectively, and a right extension portion of a shaft 14 of the electric motor 10 is connected. A dilute solution pump impeller 17 is attached to the above, a concentrated solution pump impeller 18 is attached to the left extension, and a partition plate 19 between the electric motor 10 and the dilute solution pump 8 is attached.
A hole 22 is formed in the dilute solution pump impeller 17, a hole 23 is formed in the dilute solution pump impeller 17, and a hole 24 is formed in the concentrated solution pump impeller 18.

In such a device, a part of the diluted solution whose pressure is increased by the diluted solution pump 8 flows into the electric motor 10 side through the hole 22 of the partition plate 19. Here, it is divided into two directions, one of which flows into the bearing 16 on the right side, and while lubricating the bearing 16, exits to the dilute solution pump 8 side, and then from the hole 23 of the dilute solution pump impeller 17 to the dilute solution pump 8 Return to the suction section.

The other one flows to the left side while cooling the gap between the rotor 13 and the stator 12 of the electric motor 10, further flows into the bearing 15 on the left side, and while lubricating the bearing 15, flows out to the concentrated solution pump 9 side, and then to the concentrated solution pump 9. From the hole 24 of the solution pump impeller 18 flows into the suction part of the concentrated solution pump 9. Also at this time, as described in the first embodiment, the suction portion pressure of the concentrated solution pump 9 is sufficiently lower than the discharge pressure of the diluted solution pump 8, so that the diluted solution can be flown as described above by the differential pressure.

Thus, according to the device of the present invention, the concentrated solution pump 9 is structured to be driven by the same solution pump electric motor 10 as the rare solution pump 8, and is rarely used for cooling the electric motor 10 and lubricating the bearings 15, 16. By using only a part of the dilute solution whose pressure is increased by the solution pump 8, the solution can be used as the electric motor 10 and the bearing 1.
It is possible to pressurize the concentrated solution while preventing crystallization in the gaps such as 5, 16 or the seal ring 20a.

[Effect of device]

In short, according to the present invention, an absorber, an evaporator, a condenser,
In an absorption refrigerator comprising a regenerator, a solution heat exchanger, a solution pump, and a refrigerant pump and using a crystalline solution such as an aqueous solution of lithium bromide and water as a refrigerant, a concentrated solution is introduced from the regenerator to the absorber. The solution piping system is equipped with a solution pump for facilitating the flow of the concentrated solution, and the solution pump is connected to the same electric motor as the solution pump for sending the dilute solution from the absorber to the regenerator, and is rarely connected to the electric motor. For the cooling of the electric motor and the lubrication of the bearing, make holes in the partition plate with the pump on the solution side and in the impeller of the pump, and also in the impeller of the motor shaft or the concentrated solution side pump. By supplying only the diluted solution whose pressure is increased by the pump on the diluted solution side, the concentrated solution can be cooled while cooling the motor and lubricating the bearing without crystallizing the solution in the gaps inside the motor and bearings. Since obtaining the absorption chiller solution pump can be sufficiently boosted, the present invention is intended on extremely valuable industrial.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of a solution pump for an absorption refrigerator of the present invention. FIG. 2 is a vertical sectional view of a second embodiment of the present invention. It is a systematic diagram of a refrigerator. 1 ... Absorber, 2 ... Evaporator, 3 ... Condenser, 4 ... Low pressure regenerator, 5 ... High pressure regenerator, 6 ... Low temperature side solution heat exchanger, 7 ... High temperature side solution heat exchanger, 8 ... Dilute solution pump , 9 ... concentrated solution pump, 10 ... solution pump electric motor, 11 ... refrigerant pump, 12 ... stator, 13 ... rotor, 14 ... shaft, 15 ... bearing, 16 ... bearing, 17 ... rare solution pump impeller, 18 ... concentrated Solution pump impeller, 19 ... Partition plate, 20 ... Partition plate, 20a ... Seal ring, 21
... hole, 22 ... hole, 23 ... hole, 24 ... hole.

Continuation of front page (56) References JP-A-56-110858 (JP, A) JP-A-56-25662 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An absorption refrigerator comprising a crystalline solution such as an aqueous solution of lithium bromide and water as a refrigerant, which comprises an absorber, an evaporator, a condenser, a regenerator, a solution heat exchanger, a solution pump and a refrigerant pump. A solution in which a concentrated solution is introduced from the regenerator to the absorber is equipped with a solution pump for facilitating the flow of the concentrated solution into the concentrated solution piping system, and the solution pump sends a dilute solution from the absorber to the regenerator. It is connected to the same electric motor as the pump, and holes are made in the partition plate between the electric motor and the pump on the dilute solution side and on the impeller of the pump, and on the motor shaft or on the impeller of the pump on the concentrated solution side. A solution pump for an absorption refrigerating machine, characterized in that only a dilute solution whose pressure is increased by a dilute solution side pump is provided for cooling an electric motor and lubricating a bearing portion.