JPH06272977A - Flooded type evaporator - Google Patents

Abstract

PURPOSE:To make it possible to return oil effectively from a flooded type evaporator to a compressor, while the kinds of equipment is reduced and constitution of pipings is simplified. CONSTITUTION:A partition body 11 extending in a length direction is provided on one inner side of a horizontally long shell 5 to divide the liquid zone in the shell 5 into a main evaporating section 51 and an auxiliary evaporating section 52, and a refrigerant liquid inlet port 7 is provided in the section 51 to introduce refrigerant liquid from the section 51 into the section 52. Heat exchange tubes disposed in the section 52 are connected to cold water inlet pipes 61 to form an oil concentrating section and an oil return pipe 12 is connected to the liquid region of the section 52 to concentrate the oil in a flooded type evaporator so that refrigerant liquid rich with oil can be returned to a compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled evaporator mainly used in a screw type refrigerating machine or the like, and more specifically, a horizontally long body extending horizontally and a lower body disposed inside the body.
A heat exchange tube connecting a cold water inlet pipe and a cold water outlet pipe is provided, a refrigerant liquid inlet is provided at a lower portion of the body, a refrigerant gas outlet is provided at an upper portion, and a refrigerant liquid to be introduced into the body is provided in the heat exchange tube. The present invention relates to a full-fill type evaporator that evaporates a refrigerant liquid by exchanging heat with circulating cold water.

[0002]

2. Description of the Related Art Generally, in a screw type refrigerating apparatus using a full-fill type evaporator, oil in a refrigerant circulating in a refrigeration cycle tends to stay in the full-fill type evaporator, so that the oil on the compressor side is likely to stay. Since there is a risk of insufficient lubrication due to insufficient oil, it is necessary to positively return the oil retained in the liquid-filled evaporator to the compressor side.

Therefore, in the prior art, in order to positively return the oil accumulated in the full-fill type evaporator to the compressor side, for example, it is disclosed in Japanese Patent Laid-Open No. 4-28962 and is shown in FIG. As described above, in the refrigerating apparatus in which the screw compressor A, the condenser B, the expansion valve C, and the liquid-filled evaporator D are connected by the refrigerant pipe, the refrigerant heater F including the electric heater E is used to The first pipe G communicating with the liquid region of the evaporator D is connected to the upper side of the heater F, and the refrigerant heater F is connected.
Is connected to one end of a second pipe I having a pump H in the middle thereof, the other end of the second pipe I is connected to the compressor A side, and the upper side of the refrigerant heater F. Is connected to the downstream side of the evaporator D via a third pipe J.

From the evaporator D to the first pipe G
An oil-mixed refrigerant liquid is introduced into the refrigerant heater F via the heater E, and the refrigerant liquid is heated by the heater E in the refrigerant heater F to evaporate and concentrate the oil. The generated refrigerant liquid is positively returned from the second pipe I to the compressor A side via the pump H. The refrigerant gas evaporated by the heater E in the refrigerant heater F is supplied to the compressor A from the downstream side together with the refrigerant gas passing through the evaporator D via the third pipe J.

[0005]

However, when the refrigerant heater F is used to return the oil in the liquid-filled evaporator D to the compressor A as described above, the refrigerant heater F F must be separately provided, and a power source and wiring for heating the heater E incorporated in the refrigerant heater F are also required separately, and the required devices such as the refrigerant heater F and the heater E are required. There is a problem that not only the number of pipes increases, but also the entire piping configuration becomes complicated.

Further, in the past, for example, Japanese Patent Publication No. 1-206
As shown in Japanese Patent Publication No. 97, the refrigerant liquid mixed with oil is taken out from the liquid region of the full-fill type evaporator, and is passed through a heat exchanger using the high temperature refrigerant liquid that has passed through the condenser. In the heat exchanger, the refrigerant liquid taken out from the evaporator is heated by a high-temperature refrigerant from the condenser to the evaporator to be evaporated, and as a refrigerant gas mixed with oil, an ejector or the like is used on the low pressure side of the compressor. However, even in such a case, as in the case described above, a large number of required equipments are required, and the entire piping configuration becomes complicated.

An object of the present invention is to provide a full-fill type evaporator capable of returning the oil in the full-fill type evaporator to the compressor side while reducing the number of equipments and simplifying the piping structure. Especially.

[0008]

In order to achieve the above object, the present invention has a horizontally elongated body 5 extending substantially horizontally, and a cold water inlet pipe 61 and a cold water outlet pipe 6 disposed at the lower portion of the body 5.
And a heat exchange tube 6 for connecting the two, a coolant liquid inlet 7 is provided in the lower portion of the body 5, and a coolant gas outlet 9 is provided in the upper portion,
Refrigerant liquid introduced into the body 5 is transferred to the heat exchange tube 6
In the liquid-filled evaporator in which the refrigerant liquid is evaporated by exchanging heat with the cold water flowing through the inside of the body 5,
A partition 11 extending in the longitudinal direction is provided on one side of the inside to partition the liquid area in the body 5 into a main evaporation portion 51 and an auxiliary evaporation portion 52, and the main liquid evaporation portion 7 is provided with the refrigerant liquid inlet 7 Is provided so that the refrigerant liquid is introduced from the main evaporation unit 51 to the auxiliary evaporation unit 52, while the heat exchange tube 6 arranged in the auxiliary evaporation unit 52 is connected to the cold water inlet pipe 61 to concentrate oil. That is, the oil return pipe 12 is connected to the liquid region of the auxiliary evaporation portion 52.

Further, the auxiliary evaporation portion 52 in the body 5
The straightening vane 13 extending obliquely upward from the liquid region of the above to the gas region above the main evaporating part 51 is provided, and the auxiliary vaporizing part 52 of this straightening plate 13 is provided.
The refrigerant gas outlet 9 is provided on the upper side to provide the refrigerant gas outlet pipe 1
0 is connected to the lower end of the rectifying plate 13 which is immersed in the liquid region of the auxiliary evaporating portion 52 at the lower end side of the rectifying plate 13, and oil which opens the liquid region of the auxiliary evaporating portion 52 to the upper surface side of the rectifying plate 13 The return passage 13b may be provided.

Further, the straightening vane 13 extending obliquely upward from above the auxiliary vaporizing part 52 of the body 5 to above the main vaporizing part 51 is provided, and the auxiliary vaporizing part 5 of the straightening vane 13 is provided.
The refrigerant gas outlet 9 is provided above the second side, the refrigerant gas outlet pipe 10 is connected, and the oil return pipe 14 is connected to the liquid region of the auxiliary evaporation portion 52, and the oil return pipe 14 is connected to the refrigerant. The refrigerant gas outlet pipe 10 is made to rush into the gas outlet pipe 10.
You may make it open toward the downstream side of.

Further, it is preferable that the auxiliary evaporation section 52 is provided with a liquid level detector 15 for detecting the liquid level height of the auxiliary evaporation section 52 and controlling the liquid level height controller 17.

[0012]

In the main evaporation section 51 and the auxiliary evaporation section 52, the refrigerant liquid is evaporated by exchanging heat with the cold water passing through the inside of the heat exchange tube 6, which is arranged in the auxiliary evaporation section 52. Since the heat exchange tube 6 is connected to the cold water inlet pipe 61, the temperature of the cooling water circulating through the cooling unit or the like becomes high, and the high-temperature return cold water taken in from the cold water inlet pipe 61 is the first, and the auxiliary evaporation unit Therefore, the refrigerant liquid in 52 is heat-exchanged, so that the refrigerant liquid in the auxiliary evaporating section 52 is actively heated by the high-temperature cold water to actively evaporate the refrigerant liquid.
Since the refrigerant liquid flowing from the refrigerant liquid inlet 7 is introduced from the main evaporation portion 51 to the auxiliary evaporation portion 52, the refrigerant liquid in the auxiliary evaporation portion 52 is rich in oil. It can be formed with a refrigerant liquid.

As described above, since the oil can be concentrated in the auxiliary evaporation section 52, it is not necessary to separately provide a refrigerant heater or a heat exchanger having a heater as in the conventional case, and The piping structure can be simplified because only the oil return pipe 12 is provided. Therefore, it is possible to eliminate the equipment for concentrating the oil, and the piping structure can be simplified. The oil can be effectively returned to the compressor.

Further, the auxiliary evaporation portion 52 in the body 5
The straightening vane 13 extending obliquely upward from the liquid region of the above to the gas region above the main evaporating part 51 is provided, and the auxiliary vaporizing part 52 of this straightening plate 13 is provided.
The refrigerant gas outlet 9 is provided on the upper side to provide the refrigerant gas outlet pipe 1
0 is connected to the lower end of the rectifying plate 13 which is immersed in the liquid region of the auxiliary evaporating portion 52 at the lower end side of the rectifying plate 13, and oil which opens the liquid region of the auxiliary evaporating portion 52 to the upper surface side of the rectifying plate 13 When the return passage 13b is provided, the refrigerant gas evaporated by the contact with the heat exchange tube 6 in the main evaporation portion 51 and the auxiliary evaporation portion 52 passes through the rectification plate 13 and is rectified, and then the refrigerant. The pressure is favorably sent to the compressor 1 via the gas outlet pipe 10, and the rectifying action of the rectifying plate 13 causes the upper surface side pressure of the rectifying plate 13, that is, the secondary side pressure, to be the main evaporation during operation. Utilizing the fact that the pressure becomes lower than the primary side pressure below the straightening vane 13 that forms the part 51 and the auxiliary vaporizing part 52, that is, the upper surface side pressure of the straightening vane 13 is the pressure of the auxiliary vaporizing part 52, that is, the above-mentioned. Primary side of baffle plate 13 By utilizing the fact that the low pressure to force the refrigerant liquid oil is concentrated in the auxiliary evaporator 52 by this pressure difference, the flow regulating plate from the oil return passage 13b 1
3 can be sucked up to the upper surface side and returned to the compressor together with the refrigerant gas flowing out of the refrigerant gas outlet pipe 10 through the rectifying plate 13, and thus, as in the conventional case, the refrigerant heater or the heat exchange. Since it is possible to return the oil to the compressor, it is not necessary to separately provide a device or the like, or to provide a pump or an ejector for sending the refrigerant liquid that concentrates the oil in the refrigerant heater to the compressor. is there. Moreover, in this case, since it is possible to return from the straightening plate 13 to the compressor via the refrigerant gas outlet pipe 10, there is no need to separately provide an oil return pipe, and the piping configuration can be further simplified.

Further, the auxiliary evaporation portion 5 in the body 5
2 is provided obliquely extending above the main evaporation section 51 from above 2, and the refrigerant gas outlet 9 is provided above the auxiliary evaporation section 52 side of the current plate 13 to provide the refrigerant gas outlet pipe 1
0 is connected, the oil return pipe 14 is connected to the liquid area of the auxiliary evaporation part 52, and the oil return pipe 14 is thrust into the refrigerant gas outlet pipe 10, and the downstream side of the refrigerant gas outlet pipe 10 is connected. By opening to the rectifier plate 1, the oil-rich refrigerant liquid from the auxiliary evaporation portion 52 is ejected by the ejector action.
It is possible to return to the compressor together with the refrigerant gas flowing out of the refrigerant gas outlet pipe 10 via 3. Therefore,
Also in this case, since it is only necessary to provide the oil return pipe 14 that connects the auxiliary evaporation portion 52 and the refrigerant gas outlet pipe 10, it is possible to simplify the pipe configuration.

Further, even when the liquid level of the refrigerant liquid in the body 5 becomes higher than the upper wall portion of the partition body 11 when the operation is stopped, the refrigerant liquid enters and collects on the rectifying plate 13. Therefore, when the operation is restarted, the rectifying plate 13
It is also possible to avoid the risk of so-called liquid bag in which a large amount of the refrigerant liquid accumulated above returns from the refrigerant gas outlet pipe 10 to the compressor 1 side.

Further, by providing the auxiliary evaporation unit 52 with a liquid level detector 15 which detects the liquid level height of the auxiliary evaporation unit 52 and controls the liquid level height controller 17, the liquid level detection The level of the liquid level of the auxiliary evaporator 52 is detected by the device 15, and the opening degree of the flow rate adjusting valve 16 can be controlled by the output from the controller 17 based on the detection result. From the refrigerant liquid inlet pipe 7 to the main evaporation portion 5 of the body 5
It is possible to adjust and control the amount of the refrigerant introduced into 1 so that it is always lower than the upper height of the partition plate 11.
Therefore, it is possible to prevent a decrease in the oil concentration due to the introduction of a large amount of the refrigerant liquid from the main evaporation unit 51 to the auxiliary evaporation unit 52,
The refrigerant liquid having a high oil concentration can be returned to the compressor.

[0018]

EXAMPLE FIG. 3 shows a piping system of a screw type refrigerating apparatus using a liquid-filled evaporator. The screw type compressor 1
On the refrigerant discharge side of the condenser 2, the expansion valve 3 and the full liquid type evaporator 4
Are connected via a refrigerant pipe, and a refrigeration cycle is formed by these respective devices.

As shown in FIGS. 1 and 2, the liquid-filled evaporator 4 has a heat exchange tube 6 meandering in the longitudinal direction on the inner lower side of a horizontally elongated body 5 extending in a substantially horizontal direction. A refrigerant liquid inlet 7 is provided on the lower side of the body 5, and a refrigerant liquid inlet pipe 8 extending from the expansion valve 3 side is connected to the refrigerant liquid inlet 7, while a refrigerant gas is provided on the upper side of the body 5. An outlet 9 is provided, and the compressor 1 is provided at the refrigerant gas outlet 9.
The refrigerant gas outlet pipe 10 reaching the side is connected. A cold water inlet pipe 61 and a cold water outlet pipe 62 are connected to the cold water inlet and outlet sides of the heat exchange tube 6, respectively. In the embodiment shown in FIGS. The cold water inlet pipe 61 is connected to the heat exchange tube 6 arranged on one side in the direction to take in cold water, while the body 5
The cold water outlet pipe 62 is connected to the tube 6 disposed on the other side in the radial direction to take out cooling water.

That is, the condenser 2 is provided from the refrigerant liquid inlet 7 through the refrigerant liquid inlet pipe 8 to the lower inner side of the body 5.
A refrigerant liquid mixed with oil is introduced from the expansion valve 3 through the expansion valve 3, and the refrigerant liquid and the cold water sent from the cold water inlet pipe 61 into the heat exchange tube 6 are heat-exchanged to cool the cold water in the tube 6. The refrigerant liquid is cooled and taken out from the cold water outlet pipe 62 and sent to a cooling unit or the like, while the refrigerant liquid is evaporated by heat exchange with the heat exchange tube 6, and the evaporated refrigerant gas is discharged from the upper part of the body 5. The refrigerant gas outlet 9 provided on the side is returned to the compressor 1 via the refrigerant side outlet pipe 10.

Thus, the partition body 11 extending in the longitudinal direction of the body 5 in the liquid region at one side in the radial direction in the body 5.
And the partition 11 divides the liquid area in the body 5 into a main evaporation part 51 and an auxiliary evaporation part 52, and the main evaporation part 51 is provided with the refrigerant liquid inlet 7. Partition 1
1, a communication portion 11a is formed which communicates the main evaporation portion 51 and the auxiliary evaporation portion 52, and the refrigerant liquid supplied from the refrigerant liquid inlet 7 to the main evaporation portion 51 via the communication portion 11a. Is introduced to the auxiliary evaporation section 52 side. Further, in the auxiliary evaporation part 52 defined by the partition body 11, the cold water inlet side of the heat exchange tube 6 to which the cold water inlet pipe 61 is connected is piped to form an oil concentrating portion, 5 is opened in the liquid area of the auxiliary evaporation section 52,
The oil return pipe 12 reaching the compressor 1 side is connected.

That is, the heat exchange tube 6 provided in the auxiliary evaporating section 52 is provided with the cold water inlet pipe 6 so that the high temperature cold water circulated through the cooling unit or the like can be used.
1 is connected to the heat exchange tube 6, and the high-temperature cold water flowing through the cold water inlet side of the heat exchange tube 6 actively heats the refrigerant liquid introduced from the main evaporation portion 51 into the auxiliary evaporation portion 52 to actively evaporate the refrigerant liquid. By performing the operation, the refrigerant liquid in the auxiliary evaporation unit 52 is changed to the oil-rich refrigerant liquid in which the oil is concentrated, and the oil-rich refrigerant liquid in which the oil is concentrated is returned from the oil return pipe 12 to the compressor 1. To do so.

Further, a communicating portion 11 provided on the partition body 11
a is formed by providing a notch on the upper part of the partition body 11, and the oil return pipe 12 is formed by the auxiliary evaporation part 5
2 is connected to the side of the body 5 so as to open in the liquid region near the connection between the heat exchange tube 6 and the cold water inlet pipe 61 in the longitudinal direction of 2, and by doing so,
The oil-rich refrigerant liquid can be taken out through the oil return pipe 12 from the cold water inlet side of the auxiliary evaporation part 52 where the refrigerant liquid is heat-exchanged by the cold water having the highest temperature introduced from the cold water inlet pipe 61. The refrigerant liquid with the highest oil concentration can be returned to the compressor 1 via the oil return pipe 12.

Next, the operation of the above configuration will be described. During operation of the full liquid type evaporator 4, first, an oil-mixed refrigerant liquid is introduced from the refrigerant liquid inlet pipe 8 through the refrigerant liquid inlet 7 into the main evaporation portion 51 of the body 5, and the refrigerant liquid and the The cold water in the heat exchange tube 6 is heat-exchanged to cool the cold water, and the cooling water is taken out from the cold water outlet pipe 62 connected to the heat exchange tube 6 and sent to a cooling unit or the like. Is evaporated by heat exchange with the heat exchange tube 6 to become a refrigerant gas, and this refrigerant gas is discharged from the refrigerant gas outlet 9 provided on the upper side of the body 5 through the refrigerant gas outlet pipe 10 to the compressor 1 Return to.

Further, the refrigerant liquid is introduced into the main evaporation portion 51 defined by the partition body 11, and the refrigerant liquid having an increased oil concentration due to the heat exchange in the main evaporation portion 51 is the partition liquid body 11.
Is introduced into the auxiliary evaporation section 52 from the communication section 11a, and the refrigerant liquid is heat-exchanged with the cold water passing through the heat exchange tube 6 arranged in the auxiliary evaporation section 52.
Moreover, the cold water flowing in the heat exchange tube 6 circulates through the cooling unit or the like to become a high temperature, and the cold water inlet pipe 6
Since it is the high-temperature cold water that returns to 1, the refrigerant liquid is actively heated by this high-temperature cold water to evaporate into a refrigerant gas in the auxiliary evaporation section 52, and the refrigerant liquid in the auxiliary evaporation section 52 is the main evaporation. It is possible to form an oil-rich refrigerant liquid having a high oil concentration in which oil is concentrated as compared with the refrigerant liquid of the portion 51. Therefore, the refrigerant liquid having a high oil concentration can be returned to the compressor 1 side from the oil return pipe 12 connected to the auxiliary evaporation section 52.

Therefore, in the above-described liquid-filled evaporator 4, the oil can be concentrated in the auxiliary evaporator 52, so that the oil can be concentrated in the liquid-filled evaporator 4. As described above, it is not necessary to separately provide a refrigerant heater or a heat exchanger, and the piping configuration is the same as that of the oil return pipe 1
It is possible to reduce the number of equipments and simplify the piping configuration because it is possible to have a simple configuration in which only 2 is provided, and it is possible to reliably return the oil in the liquid-filled evaporator to the compressor 1 side. Of.

In the present invention, as shown as a second embodiment in FIG. 4, the inside of the body 5 extends in the longitudinal direction of the body 5 and is defined by the partition body 11. A long straightening plate 13 extending obliquely upward from the liquid area of the auxiliary evaporating portion 52 to the upper gas area of the main evaporating portion 51 is provided to partition the inside of the body 5 into an evaporating chamber 53 and a straightening chamber 54. The refrigerant gas outlet 9 is opened in the rectifying chamber 54 to connect the refrigerant gas outlet pipe 10 and the rectifying plate 13
As shown in FIG. 5, a plurality of straightening passages 13a in the shape of an arc groove that connects the gas region of the evaporation chamber 53 to the refrigerant gas outlet pipe 10 via the straightening chamber 54 on the upper end side of the inclination. Is formed by notching, and the slanted lower end side of the straightening vane 13 is immersed in the liquid area of the auxiliary evaporating part 52, and the liquid zone of the auxiliary evaporating part 52 is placed on the upper surface side of the straightening plate 13. A round hole-shaped oil return passage 13b may be provided. In the case of the above configuration, the refrigerant gas evaporated by the contact with the heat exchange tube 6 in the main evaporation part 51 and the auxiliary evaporation part 52 is rectified by the straightening plate 1.
After flowing into the rectification chamber 54 from the rectification passage 13a of No. 3 and rectified, the compressor 1 is passed through the refrigerant gas outlet pipe 10.
It can be sent to the side favorably, and moreover, when the refrigerating apparatus is in operation, the rectification chamber 54 has a lower pressure than the evaporation chamber 53 due to the rectification action of the rectification plate 13, that is, the rectification plate. By utilizing the fact that the pressure-rectifying chamber 54 on the upper surface side of 13 is at a low pressure with respect to the auxiliary evaporation part 52, the refrigerant liquid having a high oil concentration and concentrated in the auxiliary evaporation part 52 is returned to the oil by a differential pressure. It is possible to suck up from the passage 13b to the upper surface side of the straightening vane 13 and return it to the compressor 1 together with the refrigerant gas flowing through the straightening passage 13a of the straightening vane 13 to the refrigerant gas outlet pipe 10. . Therefore, unlike the conventional case, it is not necessary to separately provide a refrigerant heater or a heat exchanger, and even if a pump or an ejector for returning a refrigerant liquid having a high oil concentration to the compressor is not separately provided, Since it can be effectively returned to the compressor 1, and according to the second embodiment, it is not necessary to dispose the oil return pipe 12 of the first embodiment shown in FIG. The configuration can be simplified.

The oil return passage 13b provided in the straightening vane 13 is preferably formed on the cold water inlet pipe connection side of the auxiliary evaporating portion 52 where the refrigerant liquid having the highest oil concentration is obtained. Thus, the refrigerant liquid having the highest oil concentration can be sent to the compressor 1 side.

Further, in the present invention, as shown in the third embodiment of FIG. 6, the inside of the body 5 extends in the longitudinal direction of the body 5 and is defined by the partition body 11. The elongated straightening vane 13 extending obliquely upward from the upper side of the auxiliary vaporizing part 52 to above the main vaporizing part 51 is provided to partition the body 5 into the vaporizing chamber 53 and the straightening chamber 54, and at the same time, the straightening plate is provided. A plurality of rectifying passages 13a are formed on the upper end side of the slope of 13,
Further, the refrigerant gas outlet 9 is opened in the rectification chamber 54, the refrigerant gas outlet pipe 10 is connected, and the refrigerant gas outlet pipe 1 is opened in the liquid region of the auxiliary evaporation portion 52.
An oil return pipe 14 having a diameter smaller than 0 is connected to the body 5, the oil return pipe 14 is erected upward from an intermediate portion and thrusts into the refrigerant gas outlet pipe 10, and the thrust is applied. The oil return pipe 14 may be bent substantially parallel to the refrigerant gas outlet pipe 10, and the tip opening of the oil return pipe 14 may be opened toward the downstream side of the refrigerant gas outlet pipe 10.

In the above-mentioned structure, the refrigerant liquid having a high oil concentration, which is concentrated in the auxiliary evaporation portion 52 by the ejector action, is passed from the oil return pipe 14 through the refrigerant gas outlet pipe 10 to the compressor 1 Can be returned to. Therefore, in this case as well, it is only necessary to provide the oil return pipe 14 that connects the auxiliary evaporation portion 52 and the vicinity of the connection portion of the refrigerant gas outlet pipe 10 with the refrigerant gas outlet 9, so that the piping shown in FIG. The configuration can be simplified.

Moreover, even if the liquid level of the refrigerant liquid in the body 5 becomes higher than the upper wall portion of the partition 11 when the operation is stopped, as in the embodiment of FIG. The refrigerant liquid 52 does not enter and accumulate on the straightening vane 13. Therefore, when the operation is restarted, the straightening vane 13
It is possible to avoid the risk of so-called liquid bag in which a large amount of the refrigerant liquid accumulated above returns from the refrigerant gas outlet pipe 10 to the compressor 1.

Further, in each of the above-described full-fill type evaporators 4, as shown in FIG. 7, a liquid level detection for detecting the liquid level height of the auxiliary evaporation section 52 on the side of the body 5 is performed. Is provided with a flow rate adjusting valve 16 in the middle of the pipe connecting the condenser 2 and the evaporator 4, and the liquid level detector 15
The amount of the refrigerant introduced from the refrigerant liquid inlet pipe 7 into the main evaporation portion 51 of the body 5 is always lower than the upper height of the partition plate 11, and the auxiliary evaporation portion 52 based on the detection result of When the liquid refrigerant from the main evaporator 51 is not introduced into the evaporator 4, the opening of the flow rate adjusting valve 16 is controlled to control the flow rate to the evaporator 4 and the evaporation is performed. A liquid level controller 17 for controlling the liquid level inside the container 4 may be provided.

In the case of the above configuration, the liquid level detector 15 detects the liquid level of the auxiliary evaporation portion 52, and the output from the controller 17 based on the detection result detects the liquid level of the flow rate adjusting valve 16. Since the opening can be controlled,
The amount of the refrigerant introduced from the refrigerant liquid inlet pipe 7 into the main evaporation portion 51 of the body 5 is adjusted and controlled so as to be always lower than the upper height of the partition plate 11, and thus the main It is possible to prevent a decrease in oil concentration due to the introduction of a large amount of refrigerant liquid from the evaporation unit 51 to the auxiliary evaporation unit 52, that is, it is possible to prevent the refrigerant liquid having a low oil concentration from being returned to the compressor 1. The refrigerant liquid having a high oil concentration can be returned to the compressor 1.

[0034]

As described above, in the liquid-filled evaporator of the present invention, the partition body 11 extending in the length direction is provided on one side of the body 5 so that the liquid area in the body 5 is mainly evaporated. Part 51
And the auxiliary evaporation section 52, and the main evaporation section 5
1 is provided with the refrigerant liquid inlet 7 to introduce the refrigerant liquid from the main evaporation portion 51 to the auxiliary evaporation portion 52, while the heat exchange tube 6 disposed in the auxiliary evaporation portion 52 is connected to the cold water inlet pipe. Since it is connected to 61 to form an oil concentrating section and the oil return pipe 12 is connected to the liquid area of the auxiliary evaporating section 52, the refrigerant liquid of the auxiliary evaporating section 52 is circulated through a cooling unit or the like to reach a high temperature, Heat is exchanged by the high-temperature return cold water taken in from the cold water inlet pipe 61, so that the refrigerant liquid in the auxiliary evaporating part 52 is actively heated by the high-temperature cold water to actively evaporate the refrigerant liquid. This is because the refrigerant liquid flowing in from the refrigerant liquid inlet 7 is once introduced into the main evaporation portion 51 and then from the main evaporation portion 51 to the auxiliary evaporation portion 52. , The auxiliary evaporation section 2 definitive refrigerant liquid is the oil can be made with the refrigerant liquid of concentrated oil-rich.

As described above, since the oil can be concentrated in the auxiliary evaporator 52, the oil can be concentrated in the liquid-filled evaporator, and the refrigerant having a heater as in the conventional case. It is not necessary to separately provide a heater or a heat exchanger, and the piping configuration can be simplified because only the oil return pipe 12 is provided. Therefore, equipment for concentrating oil can be eliminated, In addition, the oil in the full-fill type evaporator can be effectively returned to the compressor while the piping structure can be simplified.

Further, the auxiliary evaporation portion 52 in the body 5
The straightening vane 13 extending obliquely upward from the liquid region of the above to the gas region above the main evaporating part 51 is provided, and the auxiliary vaporizing part 52 of this straightening plate 13 is provided.
The refrigerant gas outlet 9 is provided on the upper side to provide the refrigerant gas outlet pipe 1
0 is connected to the lower end of the rectifying plate 13 which is immersed in the liquid region of the auxiliary evaporating portion 52 at the lower end side of the rectifying plate 13, and oil which opens the liquid region of the auxiliary evaporating portion 52 to the upper surface side of the rectifying plate 13 By providing the return passage 13b, the main evaporation portion 51
In the auxiliary evaporation section 52, the refrigerant gas evaporated by contact with the heat exchange tube 6 is rectified by passing through the rectifying plate 13, and then to the compressor 1 side via the refrigerant gas outlet pipe 10. While it can be sent well, the rectifying action of the rectifying plate 13 causes the pressure on the upper surface side of the rectifying plate 13, that is, the secondary side pressure, to cause the main evaporator 51 and the auxiliary evaporator 52 to operate. By utilizing the pressure on the lower surface side, that is, the pressure lower than the primary side pressure, the refrigerant liquid in which the oil is concentrated in the auxiliary evaporation portion 52 due to this differential pressure is transferred from the oil return passage 13b to the straightening plate. It can be sucked up to the upper surface side of 13 and returned to the compressor together with the refrigerant gas flowing out of the refrigerant gas outlet pipe 10 through the rectifying plate 13, and thus, as in the conventional case, the refrigerant heater or the heat generator. Exchanger etc. Separately or provided, also, it is the oil in these refrigerant heater and the like can be returned without the need the compressor provided specially well pump or ejector or the like for sending to the compressor the refrigerant liquid which has been concentrated. Moreover, in this case, since it is possible to return from the straightening vane 13 to the compressor through the refrigerant gas outlet pipe 10, there is no need to provide an oil return pipe, and extra piping can be eliminated.

Further, the auxiliary evaporation section 5 in the body 5
The straightening plate 13 extending obliquely upward from above 2 above the main evaporation part 51 is provided, and the auxiliary evaporation part 52 of this straightening plate 13 is provided.
The refrigerant gas outlet 9 is provided on the upper side to connect the refrigerant gas outlet pipe 10, and the oil return pipe 14 is connected to the liquid region of the auxiliary evaporating portion 52, and the oil return pipe 14 is connected to the refrigerant gas outlet. By causing the refrigerant liquid to rush into the pipe 10 and open toward the downstream side of the refrigerant gas outlet pipe 10, the refrigerant liquid in which the oil is concentrated in the auxiliary evaporation portion 52 by the ejector action is passed through the rectifying plate 13 to It can be returned to the compressor together with the refrigerant gas flowing out from the refrigerant gas outlet pipe 10. Therefore, also in this case, since it is only necessary to provide the oil return pipe 14 that connects the auxiliary evaporation portion 52 and the refrigerant gas outlet pipe 10, it is possible to simplify the pipe configuration.

Moreover, even if the liquid level of the refrigerant liquid in the body 5 becomes higher than the upper wall portion of the partition body 11 when the operation is stopped, the refrigerant liquid enters and collects on the rectifying plate 13. Therefore, when the operation is restarted, the rectifying plate 13
It is possible to avoid the risk of so-called liquid bag in which a large amount of the refrigerant liquid accumulated above returns from the refrigerant gas outlet pipe 10 to the compressor 1.

Further, by providing the auxiliary evaporation unit 52 with a liquid level detector 15 for detecting the liquid level height of the auxiliary evaporation unit 52 and controlling the liquid level height controller 17, the liquid level detection It is possible to detect the liquid surface height of the auxiliary evaporation section 52 with the device 15, and to control the opening degree of the flow rate adjusting valve 16 by the output from the controller 17 based on the detection result. From the refrigerant liquid inlet pipe 7 to the main evaporation portion 51 of the body 5
The amount of the refrigerant introduced into the inside can be adjusted and controlled so that it is always lower than the height of the upper part of the partition plate 11. Therefore, a large amount of the refrigerant liquid is introduced from the main evaporation part 51 to the auxiliary evaporation part 52. It is possible to prevent a decrease in oil concentration due to this, and to return the refrigerant liquid having a high oil concentration to the compressor.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of a liquid-filled evaporator according to the present invention.

FIG. 2 is a perspective view showing the overall structure of a liquid-filled evaporator according to the first embodiment.

FIG. 3 is a piping diagram of a refrigerating apparatus using the liquid-filled evaporator of the first embodiment.

FIG. 4 is a vertical cross-sectional view showing a second embodiment of the liquid-filled evaporator of the present invention.

FIG. 5 is a front view in which a part of a current plate used in the second embodiment is omitted.

FIG. 6 is a vertical cross-sectional view showing a third embodiment of the liquid-filled evaporator of the present invention.

FIG. 7 is a piping diagram showing an embodiment in which a liquid level detector is provided in the liquid-filled evaporator of the present invention.

FIG. 8 is a vertical sectional view showing a conventional liquid-filled evaporator.

[Explanation of symbols]

 5 Body 51 Evaporating Part 52 Auxiliary Evaporating Part 6 Heat Exchange Tube 61 Cold Water Inlet Pipe 62 Cold Water Outlet Pipe 7 Refrigerant Liquid Inlet 9 Refrigerant Gas Outlet 10 Refrigerant Gas Outlet Pipe 11 Partition 12, 14 Oil Return Pipe 13 Rectifier 13b Oil Return Passage 15 Liquid level detector 17 Liquid level height controller

Claims (4)

[Claims] 1. A heat exchange tube (6), which is provided with a horizontally elongated body (5) extending substantially horizontally and a cold water inlet pipe (61) and a cold water outlet pipe (62) which are arranged at a lower portion of the body (5). And a refrigerant liquid inlet (7) at the lower part of the body (5) and a refrigerant gas outlet (9) at the upper part of the body (5) to introduce the liquid refrigerant introduced into the body (5) into the heat exchange tube (6). A full-liquid type evaporator for evaporating a liquid refrigerant by exchanging heat with cold water flowing inside, wherein a partition body (11) extending in the length direction is provided on one side of the body (5), The liquid area in the body (5) is divided into a main evaporation part (51) and an auxiliary evaporation part (52), and the main liquid evaporation part (51) is provided with the refrigerant liquid inlet (7) to provide the main evaporation part. While the refrigerant liquid is introduced from the (51) to the auxiliary evaporation section (52), the auxiliary evaporation section (52) is also introduced. The heat exchange tube (6) to be arranged is connected to the cold water inlet pipe (61) to form an oil concentrating portion, and the oil return pipe (12) is connected to the liquid region of the auxiliary evaporation portion (52). A liquid-filled evaporator characterized in that 2. A straightening vane (13) extending obliquely upward from a liquid region of the auxiliary vaporizing part (52) in the body (5) to a gas region above the main vaporizing part (51) is provided. A refrigerant gas outlet (9) is provided above the auxiliary evaporation section (52),
The liquid area of the auxiliary evaporation part (52) is connected to the refrigerant gas outlet pipe (10) and is immersed in the liquid area of the auxiliary evaporation part (52) at the lower inclined side of the rectifying plate (13). Oil return passage (13
The liquid-filled evaporator according to claim 1, wherein b) is provided. 3. A straightening plate (13) extending obliquely upward from above the auxiliary evaporation part (52) of the body (5) above the main evaporation part (51) is provided, and the auxiliary evaporation part of this straightening plate (13). A refrigerant gas outlet (9) is provided above the (52) side to connect the refrigerant gas outlet pipe (10) and an oil return pipe (14) to the liquid region of the auxiliary evaporation section (52). The liquid-filled evaporator according to claim 1, wherein an oil return pipe (14) is projected into the refrigerant gas outlet pipe (10) and opened toward the downstream side of the refrigerant gas outlet pipe (10). 4. The auxiliary evaporation section (52) is provided with the auxiliary evaporation section (5).
The liquid-filled evaporator according to claim 1, further comprising a liquid level detector (15) for detecting the liquid level height of 2) and controlling a liquid level height controller (17).