Falling film evaporation type refrigeration cycle system with ejector

Abstract

The invention belongs to the field of falling film evaporative refrigeration, and relates to a falling film evaporative refrigeration cycle system with an ejector, the falling film evaporative refrigeration cycle system comprises a compressor, a condenser, the ejector and a falling film evaporator, the ejector comprises a main flow inlet, an ejection inlet and an ejection outlet, and the falling film evaporator comprises a liquid collection area, a spraying device, a heat exchange device and an air outlet. A gaseous refrigerant discharged from the air outlet sequentially passes through the compressor and the condenser and then enters a main flow inlet of the ejector, and meanwhile, a liquid refrigerant discharged from the liquid collection area is ejected; refrigerant discharged from an ejection outlet of the ejector is sprayed on the surface of the heat exchange device through the spraying device in a falling film evaporation mode to absorb heat and evaporate, and refrigerant liquid which is not completely evaporated flows into the liquid collection area. The liquid refrigerant in the liquid collecting area is extracted through the ejector, pressure reduction of the liquid refrigerant flowing through the condenser is achieved, and the air conditioner has the advantages of being simple in structure, small in number of quick-wear parts, low in noise and capable of saving energy, and continuous and stable refrigeration circulation can be achieved.

Description

Technical Field

[0001] The invention belongs to the field of falling film evaporative refrigeration, and relates to a falling film evaporative refrigeration cycle system with an ejector. Background Art

[0002] The heat exchanger is one of the most important components in the refrigeration system, and its performance directly affects the performance of the entire system. At present, the heat exchanger is mainly divided into air-cooled heat exchangers, water-cooled heat exchangers and evaporative condensers according to the cooling medium. Among them, the shell and tube heat exchanger, as one of the main representatives of water-cooled heat exchangers, has the advantages of high pressure resistance, good sealing, and not easy to clog and is widely used. In the shell and tube heat exchanger, the falling film evaporator has the advantages of efficient heat exchange, improved energy utilization, and small space occupation. Compared with the full liquid evaporator, it can also reduce the refrigerant charge, realizing the reduction of refrigerant use, which is more green and environmentally friendly.

[0003] In a refrigeration cycle with a falling film evaporator, an additional circulating pump is usually required. Its function is to extract liquid refrigerant from the sump of the evaporator and return it to the evaporator to maintain a continuous refrigeration cycle. However, compared with other refrigeration cycles, adding a circulating pump will increase the additional cost, maintenance cost and power consumption of the pump. At the same time, the pump will generate noise and vibration when running, which will have a certain negative impact on the surrounding environment and equipment.

[0004] In the refrigeration cycle, the throttling device plays the role of reducing the refrigerant pressure and regulating the refrigerant flow, and is an essential component of the refrigeration cycle. However, in the throttling process, the refrigerant liquid flows in a narrow channel, which will cause the total energy of the system to decrease, which is an inevitable throttling loss. Summary of the invention

[0005] The purpose of the present invention is to provide a falling film evaporation refrigeration cycle system with an ejector in order to solve the above-mentioned technical problems. The system has a simple structure and few vulnerable parts, thereby avoiding a series of problems caused by the circulating pump in the falling film evaporation refrigeration cycle, saving the throttling loss caused by the throttling device and improving the overall efficiency of the system.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A falling film evaporation refrigeration cycle system with an ejector, the falling film evaporation refrigeration cycle system comprising a compressor 8, a condenser 1, an ejector 2 and a falling film evaporator 4; the present invention utilizes the ejector 2 to realize the transmission of the refrigerant, adopts an ejection method to extract the liquid refrigerant from the liquid collecting area 3, and mixes it with the liquid refrigerant from the condenser 1, and then inputs it into the evaporator together, thereby realizing a continuous and stable refrigeration cycle. Specifically:

[0008] The ejector 2 includes a main inlet 201, an ejection inlet 203 and an ejection outlet 202;

[0009] The falling film evaporator 4 includes a liquid collecting area 3, a spraying device 5, a heat exchange device 6 and an air outlet 7;

[0010] The gaseous refrigerant discharged from the air outlet 7 passes through the compressor 8 and the condenser 1 in sequence and then enters the main inlet 201 of the ejector 2, while ejecting the liquid refrigerant discharged from the liquid collecting area 3;

[0011] The refrigerant discharged from the injection outlet 202 of the ejector 2 is sprayed on the surface of the heat exchange device 6 through the spray device 5 in a falling film evaporation manner to absorb heat and evaporate, and the refrigerant liquid that is not completely evaporated flows into the liquid collecting area 3.

[0012] Furthermore, the liquid collecting area 3, the spray device 5 and the heat exchange device 6 are arranged inside the falling film evaporator 4, and the heat exchange device 6 is located below the spray device 5 and above the liquid collecting area 3, which is conducive to the recovery of the refrigerant liquid that has not been completely evaporated.

[0013] Furthermore, the liquid collecting area 3 also includes a liquid collecting area outlet 301 located at the bottom of the liquid collecting area 3 to avoid excessive liquid refrigerant accumulation in the system, thereby achieving effective drainage and stable operation of the refrigeration system.

[0014] Furthermore, in the falling film evaporation refrigeration cycle system with ejector:

[0015] The air outlet 7 is connected to the inlet of the compressor 8, the outlet of the compressor 8 is connected to the inlet of the condenser 1, and the outlet of the condenser 1 is connected to the mainstream inlet 201 of the ejector 2;

[0016] The liquid collection area liquid outlet 301 of the liquid collection area 3 is connected to the injection inlet 203 of the ejector 2;

[0017] The injection outlet 202 of the injector 2 is connected to the spray device 5 .

[0018] Furthermore, the compressor 8 can increase the temperature and pressure of the gaseous refrigerant discharged from the air outlet 7 .

[0019] Furthermore, the refrigerant entering the main inlet 201 is in liquid state.

[0020] The beneficial effects of the present invention are:

[0021] The falling film evaporation refrigeration cycle system with an ejector of the present invention cancels the setting of the circulation pump and adopts an ejector to realize the transportation of the refrigerant. The ejector extracts the refrigerant liquid from the liquid collecting area by means of injection, mixes it with the refrigerant liquid flowing out of the condenser, and sends it to the evaporator together to realize a continuous and stable refrigeration cycle. Compared with the traditional pump, the ejector has a simpler structure and lower cost. Moreover, since it has no moving parts, it also has less noise and vibration. In addition, the evaporated refrigerant liquid has a lower pressure. The use of an ejector to inject low-pressure refrigerant liquid can replace the traditional throttling device to reduce the pressure of the high-pressure refrigerant liquid, thereby avoiding throttling losses. At the same time, the ejector allows a part of the energy of the high-pressure liquid to be transferred to the low-pressure liquid when the high-pressure liquid passes through the ejector, thereby realizing energy recovery and helping to improve the efficiency of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the falling film evaporation refrigeration cycle system with an ejector according to the present invention.

[0023] In the figure: 1 condenser, 2 ejector, 3 liquid collecting area, 4 falling film evaporator, 5 spray device, 6 heat exchange device, 7 air outlet, 8 compressor 8;

[0024] 201 is the main flow inlet, 202 is the jet outlet, 203 is the injection inlet, and 301 is the liquid outlet of the liquid collecting area. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the accompanying drawings. It should be clear that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments based on the aforementioned application content.

[0026] It should be particularly noted that in the description of this patent application, the orientation or positional relationship represented by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings. The use of these orientation words is intended to facilitate the description and simplified description of this patent application. Unless otherwise stated, these orientation words do not mean that the described device or element must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the scope of protection of this patent application; at the same time, the orientation words "inside and outside" represent the inside and outside positional relationship relative to the contours of each component itself.

[0027] like Figure 1As shown, a falling film evaporation refrigeration cycle system with an ejector comprises: a compressor 8, a condenser 1, an ejector 2 and a falling film evaporator 4; specifically: the ejector 2 comprises a mainstream inlet 201, an ejection inlet 203 and an ejection outlet 202. The falling film evaporator 4 comprises a liquid collecting area 3, a spray device 5, a heat exchange device 6 and an air outlet 7. The gaseous refrigerant discharged from the air outlet 7 passes through the compressor 8 and the condenser 1 in sequence and then enters the mainstream inlet 201 of the ejector 2, while the liquid refrigerant discharged from the ejector liquid collecting area 3 is ejected.

[0028] The refrigerant discharged from the ejection outlet 202 of the ejector 2 is sprayed on the surface of the heat exchange device 6 through the spray device 5 in a falling film evaporation manner to absorb heat and evaporate, and the refrigerant liquid that is not completely evaporated flows into the liquid collecting area 3. The present invention uses the ejector 2 to realize the transmission of the refrigerant, and extracts the liquid refrigerant from the liquid collecting area 3 in an induced manner, and mixes it with the liquid refrigerant from the condenser 1, and then inputs it into the evaporator together, thereby realizing a continuous and stable refrigeration cycle.

[0029] In this embodiment, the liquid collecting area 3, the spray device 5 and the heat exchange device 6 are arranged inside the falling film evaporator 4, and the heat exchange device 6 is located below the spray device 5 and above the liquid collecting area 3, which is conducive to the recovery of the refrigerant liquid that has not been completely evaporated.

[0030] In this embodiment, the liquid collecting area 3 also includes a liquid collecting area outlet 301 located at the bottom of the liquid collecting area 3 to avoid excessive liquid refrigerant accumulation in the system, thereby achieving effective drainage and stable operation of the refrigeration system.

[0031] In this embodiment, the air outlet 7 is connected to the inlet of the compressor 8, the outlet of the compressor 8 is connected to the inlet of the condenser 1, and the outlet of the condenser 1 is connected to the mainstream inlet 201 of the ejector 2; at the same time, the liquid collection area outlet 301 of the liquid collection area 3 is connected to the injection inlet 203 of the ejector 2; the injection outlet 202 of the ejector 2 is connected to the spray device 5 to form a complete refrigeration cycle system.

[0032] In this embodiment, the ejector can effectively reduce the pressure of the high-pressure refrigerant liquid by injecting the low-pressure refrigerant liquid, thereby avoiding energy loss due to throttling. Moreover, the ejector can transfer part of the energy to the low-pressure liquid when the high-pressure liquid passes through, thereby maximizing energy utilization.

[0033] The above-described embodiments merely express the implementation methods of the present invention, but they should not be understood as limiting the scope of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A falling film evaporation refrigeration cycle system with an ejector, characterized in that: The falling film evaporation refrigeration cycle system comprises a compressor (8), a condenser (1), an ejector (2) and a falling film evaporator (4), wherein the ejector (2) comprises a mainstream inlet (201), an injection inlet (203) and an injection outlet (202), and the falling film evaporator (4) comprises a liquid collection area (3), a spray device (5), a heat exchange device (6) and an air outlet (7); specifically: The gaseous refrigerant discharged from the air outlet (7) passes through the compressor (8) and the condenser (1) in sequence and then enters the main inlet (201) of the ejector (2), while the liquid refrigerant discharged from the liquid collecting area is ejected; the refrigerant discharged from the ejection outlet (202) of the ejector (2) is sprayed on the surface of the heat exchange device (6) through the spray device (5) in a falling film evaporation manner to absorb heat and evaporate, and the refrigerant liquid that has not been completely evaporated flows into the liquid collecting area (3).

2. A falling film evaporation refrigeration cycle system with an ejector according to claim 1, characterized in that: The liquid collecting area (3), the spraying device (5) and the heat exchange device (6) are arranged inside the falling film evaporator (4), and the heat exchange device (6) is located below the spraying device (5) and above the liquid collecting area (3).

3. The falling film evaporation refrigeration cycle system with an ejector according to claim 1, characterized in that: The air outlet (7) is located above the liquid collecting area (3) and below the heat exchange device (6).

4. The falling film evaporation refrigeration cycle system with an ejector according to claim 1, characterized in that: The liquid collecting area (3) further comprises a liquid collecting area liquid outlet (301) located at the bottom of the liquid collecting area (3) and connected to the injection inlet (203) of the ejector (2).

5. The falling film evaporation refrigeration cycle system with an ejector according to claim 1, characterized in that: The air outlet (7) is connected to the inlet of the compressor (8), the outlet of the compressor (8) is connected to the inlet of the condenser (1), and the outlet of the condenser (1) is connected to the mainstream inlet (201) of the ejector (2).

6. The falling film evaporation refrigeration cycle system with an ejector according to claim 1, characterized in that: The spray outlet (202) of the sprayer (2) is connected to the spray device (5).

7. The falling film evaporation refrigeration cycle system with ejector according to claim 1, characterized in that: The compressor (8) can increase the temperature and pressure of the gaseous refrigerant discharged from the air outlet (7).

8. The falling film evaporation refrigeration cycle system with ejector according to claim 1, characterized in that: The refrigerant entering the main inlet (201) is in liquid state.

9. The falling film evaporation refrigeration cycle system with ejector according to claim 1, characterized in that: The falling film evaporation refrigeration cycle system uses an ejector (2) to transport refrigerant, extracts liquid refrigerant from a liquid collecting area (3) by means of an ejector, mixes the liquid refrigerant with the liquid refrigerant from a condenser (1), and then inputs the mixture into an evaporator, thereby realizing a continuous and stable refrigeration cycle.

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