Refrigerating unit and a two-stage turbo-compressor unit of a refrigeration plant

 

(57) Abstract:

Usage: in the heat, in the refrigeration industry. The inventive refrigeration system includes an evaporator, a two-stage turbo-compressor unit, a condenser and throttling device, included in the main line of flow of the refrigerant. The capacitor is also connected by auxiliary lines to the cooling system turbo-compressor units, which, in turn, communicates with the inlet of the second stage turbo-compressor units. The plant is equipped with auxiliary and main recuperative heat exchangers in series along the flow included in a refrigerated environment in the main line for the capacitor, and an additional line installed on it thermostatic expansion valve. The auxiliary heat exchanger is enabled by the cooling medium in the auxiliary line and the additional line is connected to the auxiliary line to the cooling system and after it before entering into the auxiliary heat exchanger. The main heat exchanger for cooling the environment are included in the main line for the evaporator. Thermostatic expansion valve is made adjustable on the state of the thread in vspomogatelnaya to the power system and can be used in refrigeration, in particular,operated by transport.

Known refrigerating unit, containing the evaporator, condenser and two-stage turbo-compressor unit, the steps of which are mounted on the motor shaft on the opposite side of him, placed the engine in a single sealed housing and communicated by a channel made in the body, and motor cooling flow of the refrigerant flowing from the first or second stage turbocharger (U.S. patent N 3447335, CL F 25 B 1/10, 1969).

A disadvantage of the known refrigeration systems and two-stage turbo-compressor unit is insufficient cooling of high-speed high-load motor, because the motor comes already heated as a result of compression in two stages turbocharger refrigerant flow.

Also known refrigerating unit, containing the evaporator, the two-stage turbocompressor unit with impellers steps, placed at opposite ends of the shaft of the motor, condenser and throttling device, connected in series in the main line of flow of the refrigerant, the condenser, the gaseous phase through segata, the output of which is communicated with the inlet of the second stage of the turbocharger [2]

A disadvantage of the known installation is in a low reliability of the cooling system turbo-compressor units, due to the fact that the cooling system is designed to flow into the cavity of the motor only the gaseous phase of the refrigerant from the condenser, which is inefficient.

Closest to the invention is a refrigerating unit, containing an evaporator, a two-stage turbo-compressor unit and a condenser included in the main line of flow of the refrigerant, which is equipped with a throttling device, and the capacitor is also connected in the liquid phase through the inlet area of the auxiliary line of flow of refrigerant to the cooling system turbo-compressor unit, in communication with the outlet section of the auxiliary line is provided to the input of the second stage turbo-compressor unit through the auxiliary heat exchanger, and an additional throttling device [1]

A disadvantage of the known installation is in a low efficiency caused by insufficient cooling of the flow of the refrigerant coming from the condenser to the evaporator.

Also known Naib is MEDICINY case, which are communicated between the first and second stage turbo-compressor units and placed between the last motor, the rotor of which is mounted on the same shaft with impellers of the stairs, facing the entrances to the opposite side, and a stator fixed in the housing, with the housing provided with channels for supplying and discharging refrigerant, communicated with the cooling system turbo-compressor unit, including the channels made in the casing of the stator of the motor [2]

A disadvantage of the known turbo-compressor unit is its low efficiency associated with large energy consumption for cooling heavily loaded motor, and low reliability associated with the possible failure of the motor due to insufficient cooling of the latter, because the cooling of the motor is produced by a direct blow cavity of the engine of the gaseous phase of the refrigerant.

The invention is directed to improving the efficiency and reliability as part of the refrigeration unit, and the turbo-compressor unit of the refrigeration installation.

The problem is solved in that the refrigerating unit, containing the COI is Ghent, fitted with a throttling device, the capacitor is also connected in the liquid phase through the inlet area of the auxiliary line of flow of refrigerant to the cooling system turbo-compressor unit, in communication with the outlet section of the auxiliary line is provided to the input of the second stage turbo-compressor unit through the auxiliary heat exchanger, and an additional throttling device according to the invention is provided with an additional line and the main recuperative heat exchanger, while the auxiliary heat exchanger regenerative and both of the heat exchanger in series along the flow included in a refrigerated environment in the main line for the capacitor, the auxiliary heat exchanger is enabled by the cooling medium in the discharge area of the auxiliary line, and the additional line is connected to the inlet section of the auxiliary line and its outlet section before entering into the auxiliary heat exchanger, the additional throttling device made in the form of a thermostatic expansion valve, the latter is installed on a secondary line and is made adjustable by the state of flow in the auxiliary line at the exit of the VSP is ielem.

Cooling unit can be provided for two-stage turbo-compressor unit with a system of cooling, the entrance of which is connected to the inlet section of the auxiliary line, and the output to the discharge section of the latter to the point of connection of an additional line at the same time, the turbo-compressor unit included in the main line before the main turbo-compressor unit.

The problem is solved also by the fact that in the two-stage turbo-compressor unit refrigeration unit that contains a sealed enclosure in which are communicated between the first and second stage turbo-compressor units and placed between the last motor, the rotor of which is mounted on the same shaft with impellers of the stairs, facing the entrances to the opposite side, and a stator fixed in the housing through the casing, the casing is provided with channels for supplying and discharging the refrigerant provided by the cooling system turbo-compressor unit, including the channels made in the casing of the stator of the motor according to the invention stage unit communicated through the annular channel, made in the case, and systemic communicated with the channels in the stator shell.

In Fig. 1 shows a diagram of a refrigeration plant with a single two-stage turbo-compressor unit of Fig. 2 is the same, with two-stage turbo-compressor units; Fig. 3 two-stage turbo-compressor unit, a longitudinal section.

Cooling unit (see Fig. 1) includes an evaporator 1, a two-stage turbo-compressor unit 2 and the condenser 3, is included in the main line 4 of the refrigerant flow, which includes a throttling device 5. The capacitor 3 is also connected by means of the inlet section of the auxiliary line 6 flow of refrigerant to the cooling system turbo-compressor unit 2, is in communication with the outlet section of the auxiliary lines 6. The plant is equipped with thermostatic expansion valve 7, the auxiliary and main recuperative heat exchangers 8, 9, successively along the stream included in a refrigerated environment in the main line 4 with the capacitor 3, and an additional line 10. The discharge area of the auxiliary line 6 communicates with the inlet of the second stage turbo-compressor unit 2. The auxiliary heat exchanger 8 is enabled by the cooling medium in the discharge area of the auxiliary lines 6, and the additional line 10 is connected to Annik 8. Thermostatic expansion valve 7 is installed in an extra line 10, and is made adjustable by the state of flow in the auxiliary line 6 at the output of the auxiliary heat exchanger 8. The main heat exchanger 10 for cooling the environment are included in the main line 4 for the evaporator 1. Throttling device 5 may be made in the form of a thermostatic expansion valve, regulated by the state of flow in the main line 4 at the outlet of the evaporator 1.

Cooling unit can be provided for two-stage turbo-compressor unit 11 (see Fig. 2) with a system of cooling, the entrance of which is connected to the inlet section of the auxiliary lines 6 and the outlet to the outlet section of the latter to the point of connection of an additional line 10. Additional turbo-compressor unit 11 included in the main line 4, before the main turbo-compressor unit 2. The unit also is equipped with a receiver 12, the filter-drier 13, the electromagnetic valves 14, 15, 16, mounted, respectively, on the main line 4, the bypass line 17 and line defrost 18 and valves 19, 20, 21, respectively, purging, draining and filling.

Two-stage turbo-compressor unit 2 or 11 halva and second stages 23, 24 turbo-compressor units and placed between the last motor 25, the rotor 26 which is mounted on the same shaft 27 with the impellers of the steps 23, 24, converts the inputs in opposite directions. The stator 28 of the motor 25 is fixed in the housing 22 through the casing 29. In the housing 22 provided with channels 30 inlet and outlet of the refrigerant provided with a cooling system turbo-compressor units, including channels 31 made in the casing 29 of the stator 28 of the electric motor 25. Steps 23, 24 units communicated through the annular channel 32, is made in the housing 22. The cooling system is equipped with interstage heat exchanger 33, mounted in the annular channel 32, and the heat exchanger 33 is in communication with the channels 31 in the casing 29 of the stator 28. The shaft 27 is in angular contact bearings 34, 35.

Refrigerating unit and a two-stage turbo-compressor unit in its structure according to Fig. 1, 3 are as follows. When voltage is applied to the electric motor 25, the latter results in the operation of the turbocharger 2. A pair of refrigerant sucked from the evaporator 1 and fed to the main line 4 of the flow of the refrigerant heated in the main regenerative heat exchanger 9 and is compressed sequentially is OK liquid refrigerant after the condenser 3 and the receiver 12 is divided into two major and minor. The main stream is cooled in the auxiliary regenerative heat exchanger 8, and then is cleaned from mechanical impurities and moisture in the filter-drier 13, further cooled in the main regenerative heat exchanger 9 and through the open solenoid valve 14 enters the throttling device 5 in the form of a thermostatic expansion valve that regulates the flow of refrigerant into the evaporator 1, maintaining a certain overheating of the refrigerant vapor at the outlet of the evaporator 1. Next, a pair of refrigerant from the evaporator 1 again enter the first stage 23 of the main turbocharger 2. Auxiliary refrigerant flow is divided into two. One on the inlet section of the auxiliary line 6 is supplied to the cooling of the turbocharger 2, and the second extra line 10 on thermostatic expansion valve 7. At the outlet section of the auxiliary line 6 after passing through the cooling system turbocharger 2 streams supporting and auxiliary lines 6 and 10 are mixed and fed in the auxiliary regenerative heat exchanger 8 is used as a cooling refrigerant in line 4 of the basic flow. After passing through the heat exchanger, where it is digested, the remaining liquid part of the refrigerant, the last postsets as follows. The refrigerant from the main line 4 is fed to the input rotating the main wheel of the first stage 23, is forced past the annular channel 32 and then fed to the inlet of the impeller of the second stage 24, where it is pumped to the condenser 3. The input of the second stage 24 and enters the refrigerant from the discharge area of the auxiliary line 6. From the inlet section of the auxiliary line 6 liquid refrigerant enters one of the channels 30, made in the housing 22. I.e., the refrigerant passes or first heat exchanger 33, and then through the channels 31 made in the casing 29 of the stator 28, and exits through another channel 30 in the discharge area of the auxiliary lines 6 or first one of the channel 30 is held in channels 31, and then flows into the heat exchanger 33 and exits through another channel 30 in the housing 22. The flow direction in the cooling system depends on the location of the connection channels 30. The stream of liquid passing through the channels 30, 31 and the heat exchanger 33, cools the electric motor 25. When this part of the heat is removed and the flow of the refrigerant flowing in the annular channel 32 from the first stage 23 of the second stage 24 of the turbocharger 2.

A refrigeration unit shown in Fig. 1, it is advisable to operate as air-cond is th installation is depicted in Fig. 2, it is expedient to operate when it is necessary to get a lower temperature. In this work it is similar to the installation shown in Fig. 1, with the only difference that the flow of refrigerant from the evaporator 1 comes first in the advanced turbo-compressor unit 11 and from there into the main unit 10. The flow of the refrigerant coming from the air conditioner 3 and the receiver 12 in the auxiliary line 6, is divided not into two but into three refrigerant flow. One, as in Fig. 1, enters the additional line 10 with the expansion valve 7, and the other two in the cooling system, the primary and secondary turbo-compressor units 2, 11. After cooling the engines of 25 units 2, 11, which is the same as that previously described, all three flow: cooling turbo-compressor units 2, 11, and after the expansion valve 7, are mixed and fed into the auxiliary heat exchanger 8 for cooling the refrigerant of the main line 4.

Line 18 defrost is designed for refrigeration systems (see Fig. 2), operating at temperatures in the evaporator 1 is below the 0oC, where as a result can form ice. If necessary, remove ice from isperia turbo-compressor unit 2 high pressure in the evaporator 1.

Regulation of the cooling capacity of the installation and the temperatures get cold is produced by changing the speed of rotation of the impeller turbo-compressor units 2, 11, by changing the frequency of the current feeding their motors 25.

1. Refrigerating unit, containing an evaporator, a two-stage turbo-compressor unit and a condenser included in the main line of flow of the refrigerant, which is equipped with a throttling device, and the capacitor is also connected in the liquid phase through the inlet area of the auxiliary line of flow of refrigerant to the cooling system turbo-compressor unit, in communication with the outlet section of the auxiliary line is provided to the input of the second stage turbo-compressor unit through the auxiliary heat exchanger, and an additional throttling device, characterized in that it is provided with an additional line and the main recuperative heat exchanger, while the auxiliary heat exchanger regenerative, and both of the heat exchanger in series along the flow included in a refrigerated environment in the main line for the capacitor, the auxiliary heat exchanger is enabled by the cooling medium in ateneu line and its outlet section before entering into the auxiliary heat exchanger, additional throttling device made in the form of a thermostatic expansion valve, the latter is installed on a secondary line and is made adjustable by the state of flow in the auxiliary line output from the auxiliary heat exchanger, the primary heat exchanger for cooling the environment are included in the main line for the evaporator.

2. Installation under item 1, characterized in that it is provided with an additional two-stage turbo-compressor unit with cooling system, the input of which is connected to the inlet section of the auxiliary line, and the output to the discharge section of the latter to the point of connection of an additional line at the same time, the turbo-compressor unit included in the main line before the main turbo-compressor unit.

3. Two-stage turbo-compressor unit of refrigeration equipment containing sealed enclosure in which are communicated between the first and second stage turbo-compressor units and placed between the last motor, the rotor of which is mounted on the same shaft with impellers of the stairs, facing the entrances to the opposite side, and a stator fixed in the housing through bicompression unit, including the channels made in the casing of the stator of the motor, characterized in that the step Assembly is communicated through the annular passage in the housing, and the cooling system is equipped with interstage heat exchanger, installed in the annular channel, and a heat exchanger in communication with the channels in the stator shell.

 

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SUBSTANCE: the invention is dealt with the field of cooling installations equipment and may be used for production of air conditioning systems. The gas compressor contains a body and located in it two driving and two driven pistons. The body is made out of two hemispheres and contains two gaskets made out of an antifriction heat-insulating elastic-flexible material. Each piston is made in the form of ball-type sectors, on a spherical surface of each of which there is an elastic member. An aperture angle of lateral surfaces of the sectors of the driving pistons makes 86° - 90°, and an aperture angle of the lateral surfaces of the sectors of the driven pistons makes 42°-83°. A groove is made radial with trapezoidal cross-section and oriented perpendicularly to axes of the shaft of the compressor. The bases of the cross-section are in ratio of 1:2 - 1:5, and a lateral side is equal to the length of the smaller base. The elastic member is located on the bottom of each groove and its cross-section is an ellipse. The bigger diameter of the ellipse by 3-7 % is more than the length of the centerline of the trapezoidal cross-section of such a groove. On the elastic member there is the second elastic member of a rectangular cross section, the width of which by 2-5 % exceeds the length of the smaller base of the groove, and its length ensures formation of a ledge on the ball-type surface of the piston, the height of which makes 1-3 % of the smaller base of the groove. The invention allows to increase efficiency of the gas compressor.

EFFECT: the invention ensures increased efficiency of the gas compressor.

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