A distillation device for refrigeration system

Abstract

The invention discloses a rectification device for a refrigeration system, belonging to the technical field of refrigeration systems, comprising a second air pipe, the right end of the second air pipe is fixedly connected with a first condenser, one end of the second air pipe away from the first condenser is fixedly connected with a rectification tower, the top output end of the rectification tower is fixedly connected with a low-boiling-point gas outflow pipe and a high-boiling-point gas outflow pipe, the other end of the high-boiling-point gas outflow pipe is fixedly connected with a second condenser, the other end of the low-boiling-point gas outflow pipe is fixedly connected with a compressor, the output end of the second condenser is fixedly connected with the input end of the compressor, the rectification tower is divided into an upper layer and a lower layer of the tower, the top of the upper layer of the tower is provided with a conical top, a vent pipe is provided between the second condenser and the compressor, and a throttle valve is provided in the middle of the vent pipe. The rectification device of the invention can be equivalent to a multi-stage partial condenser, can better separate low-boiling-point and high-boiling-point working fluids, and has high working efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration, in particular to a rectification device for a refrigeration system. Background Art

[0002] Generally speaking, a cascade refrigeration system is usually used in a temperature environment of minus forty degrees Celsius. It can be used in different fields according to different temperature zones, such as preserving low-temperature organisms, cooling sensors, and testing the performance of objects and materials in a low-temperature environment. There are generally two types of cascade refrigeration systems: one is a multi-cycle cascade type, which is a two-stage system, and the two are coupled together through a condenser evaporator. However, this system also has its disadvantages, and two compressors need to be enabled at the same time when in use. The other is an automatic cascade type, in which the refrigerant is mainly a non-azeotropic mixture, and it only needs to use a single-stage compressor when in use.

[0003] However, since the multi-stage fractionation cycle cannot effectively separate low-boiling point and high-boiling point, it can use a compressor to achieve multi-stage fractionation and only use one distillation unit. The use of mixed working fluids in the distillation unit can replace multi-stage fractionation, which can greatly increase the separation rate. Summary of the invention

[0004] The object of the present invention is to provide a distillation device for a refrigeration system to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising a second air pipe, the right end of the second air pipe is fixedly connected to the first condenser, the end of the second air pipe away from the first condenser is fixedly connected to the distillation tower, the top output end of the distillation tower is fixedly connected to the low-boiling-point gas outflow pipe and the high-boiling-point gas outflow pipe, the other end of the high-boiling-point gas outflow pipe is fixedly connected to the second condenser, the other end of the low-boiling-point gas outflow pipe is fixedly connected to the compressor, the output end of the second condenser is fixedly connected to the input end of the compressor, and the output end of the compressor is fixedly connected to the input end of the first condenser;

[0006] The distillation tower is divided into an upper tower layer and a lower tower layer, the lower tower layer is fixedly connected to the upper tower layer through a throttle, and the top of the upper tower layer is provided with a conical top;

[0007] A vent pipe is arranged between the second condenser and the compressor, and a throttle valve is arranged in the middle of the vent pipe.

[0008] As a further description of the above technical solution:

[0009] The output end of the right surface of the distillation tower is fixedly connected with a high-boiling-point liquid outflow pipe, and the input end of the right surface of the distillation tower is fixedly connected with a third gas pipe.

[0010] As a further description of the above technical solution:

[0011] One end of the high-boiling-point liquid outflow pipe away from the distillation tower is fixedly connected to a low-pressure generator, and the output end of the low-pressure generator is fixedly connected to the third gas pipe.

[0012] As a further description of the above technical solution:

[0013] Condensation pipes are arranged inside the first condenser and the second condenser.

[0014] As a further description of the above technical solution:

[0015] A control valve is arranged in the middle of the low-boiling-point gas outflow pipe and the high-boiling-point gas outflow pipe.

[0016] As a further description of the above technical solution:

[0017] The throttle valve is composed of a valve stem, a valve cover, a movable groove, a valve disc, a gas outflow channel and a valve rotary wheel. The top end of the valve stem is fixedly connected to the valve rotary wheel, the lower end of the valve stem is fixedly connected to the valve disc, the valve stem and the valve cover are connected by threads, the valve stem slides in the movable groove, the gas outflow channel is arranged inside the valve body, and the valve cover is fixedly connected to the upper surface of the valve body.

[0018] As a further description of the above technical solution:

[0019] A heating plate is fixedly connected to the side wall of the lower layer of the tower, and the heating plate is annular.

[0020] As a further description of the above technical solution:

[0021] The output end of the compressor is fixedly connected to a first air pipe, and the other end of the first air pipe is fixedly connected to the input end of the first condenser.

[0022] The present invention has the following beneficial effects:

[0023] 1. Compared with the prior art, the refrigeration system uses a cold circulation system of a distillation device, and the distillation device it has can be equivalent to a multi-stage condenser, which can better separate low-boiling point and high-boiling point working fluids and has high working efficiency.

[0024] 2. Compared with the prior art, the distillation tower of the rectification device used in the refrigeration system is divided into two layers, the upper layer is used for mixing high-boiling point liquids, and the lower layer is used for heating and separating the mixed liquids. The upper layer and the lower layer are connected by a throttle port, which greatly improves the efficiency of distillation.

[0025] 3. Compared with the prior art, the top of the distillation tower of the distillation device of the refrigeration system is set to be conical, so that the gas can move out fully and will not remain to affect the subsequent condensation cycle.

[0026] 4. Compared with the prior art, the rectification device for the refrigeration system is provided with a throttle valve between the second condenser and the compressor, and the valve size can be adjusted according to different types of coolant to perform throttling evaporation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 It is a structural schematic diagram of a rectification device for a refrigeration system of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure inside a distillation tower of a distillation device for a refrigeration system of the present invention;

[0030] Figure 3 It is a schematic structural diagram of a condenser of a rectification device for a refrigeration system of the present invention;

[0031] Figure 4 The present invention is a schematic diagram of the structure of a throttle valve of a distillation device for a refrigeration system.

[0032] In the figure: 1. compressor; 2. first air pipe; 3. first condenser; 4. low pressure generator; 5. second air pipe; 6. high boiling point liquid outflow pipe; 7. third air pipe; 8. distillation tower; 9. low boiling point gas outflow pipe; 10. high boiling point gas outflow pipe; 11. second condenser; 12. throttle valve; 13. conical top; 14. throttle port; 15. heating plate; 16. condenser; 17. valve stem; 18. valve cover; 19. movable groove; 20. valve disc; 21. gas outflow channel; 22. valve body; 23. valve wheel. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-4The present invention provides a technical solution: a distillation device for a refrigeration system, comprising a second air pipe 5, the right end of the second air pipe 5 is fixedly connected to a first condenser 3, the end of the second air pipe 5 away from the first condenser 3 is fixedly connected to a distillation tower 8, the top output end of the distillation tower 8 is fixedly connected to a low-boiling-point gas outflow pipe 9 and a high-boiling-point gas outflow pipe 10, the other end of the high-boiling-point gas outflow pipe 10 is fixedly connected to a second condenser 11, the other end of the low-boiling-point gas outflow pipe 9 is fixedly connected to a compressor 1, the output end of the second condenser 11 is fixedly connected to the input end of the compressor 1, the output end of the compressor 1 is fixedly connected to the input end of the first condenser 3, control valves are provided in the middle of the low-boiling-point gas outflow pipe 9 and the high-boiling-point gas outflow pipe 10, the output end of the compressor 1 is fixedly connected to the first air pipe 2, and the other end of the first air pipe 2 is fixedly connected to the input end of the first condenser 3.

[0035] The distillation tower 8 is divided into an upper tower layer and a lower tower layer. The lower tower layer is fixedly connected to the upper tower layer through a throttle 14. The top of the upper tower layer is provided with a conical top 13. The output end of the right surface of the distillation tower 8 is fixedly connected to a high boiling point liquid outflow pipe 6, and the input end of the right surface of the distillation tower 8 is fixedly connected to a third gas pipe 7. The end of the high boiling point liquid outflow pipe 6 away from the distillation tower 8 is fixedly connected to a low pressure generator 4, and the output end of the low pressure generator 4 is fixedly connected to the third gas pipe 7. The side wall of the lower tower layer is fixedly connected to a heating plate 15, and the heating plate 15 is annular.

[0036] A ventilation pipe is arranged between the second condenser 11 and the compressor 1, and a throttle valve 12 is arranged in the middle of the ventilation pipe. The throttle valve 12 is composed of a valve stem 17, a valve cover 18, a movable groove 19, a valve disc 20, a gas outflow channel 21 and a valve rotary wheel 23. The top end of the valve stem 17 is fixedly connected to the valve rotary wheel 23, the lower end of the valve stem 17 is fixedly connected to the valve disc 20, the valve stem 17 is connected to the valve cover 18 by threads, the valve stem 17 slides in the movable groove 19, the gas outflow channel 21 is arranged inside the valve body 22, the valve cover 18 is fixedly connected to the upper surface of the valve body 22, and a condenser pipe 16 is arranged inside the first condenser 3 and the second condenser 11.

[0037] Working principle of the present invention:

[0038] First, the non-azeotropic mixed working fluid is compressed using the compressor 1, and then enters the first condenser 3 for condensation. The vapor-liquid mixture obtained by the treatment is placed in the distillation tower 8 for heating, and then throttled into the tower. After distillation and separation, high-purity low-boiling gas will escape from the top of the tower, and high-boiling point liquid will flow out from the bottom of the tower. The liquid will evaporate after low-pressure cooling. After evaporation, it will first be operated in the distillation tower 8 and then mixed with the low-pressure gas. In this way, it can evaporate at low temperature. The gas escaping from the top of the tower is condensed, and the obtained liquid is then supercooled in the second condenser 11 and then throttled for evaporation. In this way, low temperature can be achieved.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rectification device for a refrigeration system, comprising a second gas pipe (5), characterized in that: The right end of the second gas pipe (5) is fixedly connected to the first condenser (3); the end of the second gas pipe (5) away from the first condenser (3) is fixedly connected to the distillation tower (8); the top output end of the distillation tower (8) is fixedly connected to a low-boiling-point gas outflow pipe (9) and a high-boiling-point gas outflow pipe (10); the other end of the high-boiling-point gas outflow pipe (10) is fixedly connected to the second condenser (11); the other end of the low-boiling-point gas outflow pipe (9) is fixedly connected to the compressor (1); the output end of the second condenser (11) is fixedly connected to the input end of the compressor (1); and the output end of the compressor (1) is fixedly connected to the input end of the first condenser (3); The distillation tower (8) is divided into an upper tower layer and a lower tower layer, the lower tower layer is fixedly connected to the upper tower layer via a throttle (14), and the top of the upper tower layer is provided with a conical top (13); A vent pipe is provided between the second condenser (11) and the compressor (1), and a throttle valve (12) is provided in the middle of the vent pipe; The output end of the right surface of the distillation tower (8) is fixedly connected to a high-boiling-point liquid outflow pipe (6), and the input end of the right surface of the distillation tower (8) is fixedly connected to a third gas pipe (7); Condensation pipes (16) are provided inside the first condenser (3) and the second condenser (11).

2. A rectification device for a refrigeration system according to claim 1, characterized in that: One end of the high-boiling-point liquid outflow pipe (6) away from the distillation tower (8) is fixedly connected to a low-pressure generator (4), and the output end of the low-pressure generator (4) is fixedly connected to the third gas pipe (7).

3. A rectification device for a refrigeration system according to claim 1, characterized in that: Control valves are provided in the middle of the low-boiling-point gas outflow pipe (9) and the high-boiling-point gas outflow pipe (10).

4. A rectification device for a refrigeration system according to claim 1, characterized in that: The throttle valve (12) is composed of a valve stem (17), a valve cover (18), a movable groove (19), a valve flap (20), a gas outflow channel (21) and a valve rotary wheel (23); the top end of the valve stem (17) is fixedly connected to the valve rotary wheel (23); the lower end of the valve stem (17) is fixedly connected to the valve flap (20); the valve stem (17) and the valve cover (18) are connected by threads; the valve stem (17) slides in the movable groove (19); the gas outflow channel (21) is arranged inside the valve body (22); and the valve cover (18) is fixedly connected to the upper surface of the valve body (22).

5. A rectification device for a refrigeration system according to claim 1, characterized in that: A heating plate (15) is fixedly connected to the side wall of the lower layer of the tower, and the heating plate (15) is annular.

6. A rectification device for a refrigeration system according to claim 1, characterized in that: The output end of the compressor (1) is fixedly connected to a first air pipe (2), and the other end of the first air pipe (2) is fixedly connected to an input end of a first condenser (3).

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