Large-height-difference gravity liquid supply refrigerating system

Abstract

The utility model provides a large-height-difference gravity liquid supply refrigerating system, which relates to the technical field of refrigerating systems and comprises a refrigerating compressor, an oil separator, a condenser, a first liquid storage device, an electric control valve, a gas-liquid separator, a heat exchanger, a second liquid storage device, a stop valve, a filter, a liquid supply electromagnetic valve, an electric control valve, an evaporator, a stop valve for a sensor and the sensor. The device comprises a micro gas-liquid separator, a stop valve, a one-way stop valve and a liquid level switch. According to the high-altitude-difference refrigerating system, the problems of energy consumption caused by a pump liquid supply mode adopted by a traditional high-altitude-difference refrigerating system and excessive refrigerant charge amount caused by multi-time liquid supply can be effectively reduced, and energy conservation and emission reduction are facilitated; the influence of a static liquid column of a large-height-difference gravity liquid supply system on heat exchange of the evaporator can be avoided; the refrigeration tail end adopts an oil-free cold carrying mode, so that the heat exchange efficiency of the evaporator can not be influenced by an oil film; in addition, gravity liquid supply is adopted in the system, the machine room can be arranged on the roof and does not occupy the storeroom volume, and the storeroom volume can be effectively increased.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration systems, in particular to a large height difference gravity liquid supply refrigeration system. Background Art

[0002] The high-height difference liquid supply refrigeration system refers to the one where the height difference between the evaporator and the refrigeration unit reaches more than 15 meters. For this type of refrigeration, the current design generally adopts a multiple pump circulation liquid supply method to ensure the stability of the terminal liquid supply. However, this method will increase energy consumption due to the addition of a circulation pump. On the other hand, the multiple liquid supply form must also require a large amount of refrigerant to ensure the operation of the system. The new cold storage design standard emphasizes that the refrigerant charge of the system should be reduced as much as possible in the design of the refrigeration system. Therefore, if you want to adapt the gravity liquid supply method to the high-height difference liquid supply system, how to ensure the terminal liquid level control of the refrigeration system, how to ensure the heat exchange effect of the evaporator, and how to solve the problems of return gas carrying liquid have become a major problem in promoting the gravity liquid supply method.

[0003] In summary, the utility model designs a large height difference gravity liquid supply refrigeration system to ensure the terminal refrigerant liquid level and the heat exchange effect of the evaporator. Utility Model Content

[0004] The utility model provides a large height difference gravity liquid supply refrigeration system, which solves the problem that the gravity liquid supply method cannot guarantee the refrigeration terminal liquid level control, the evaporator heat exchange effect and the return air carrying liquid when it is adapted to the large height difference liquid supply system.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A large height difference gravity liquid supply refrigeration system comprises a refrigeration compressor, wherein the air intake of the refrigeration compressor is connected to the air outlet of a gas-liquid separator, the exhaust port of the refrigeration compressor is connected to the air inlet of an oil separator, the exhaust port of the oil separator is connected to the air inlet of a condenser, the liquid outlet of the condenser is connected to the liquid inlet of a first liquid reservoir, the liquid outlet of the first liquid reservoir is connected to the liquid inlet of the gas-liquid separator, the liquid outlet of the gas-liquid separator is connected to the liquid inlet of a first refrigerant of a heat exchanger, and the air outlet of the first refrigerant of the heat exchanger is connected to The air inlet of the gas-liquid separator is connected, the air inlet and liquid outlet of the second refrigerant of the heat exchanger are respectively connected to the air outlet and liquid inlet of the second liquid reservoir, the liquid outlet of the second liquid reservoir is connected to the liquid supply port of the evaporator through a first pipe, the return air port of the evaporator is connected to the miniature gas-liquid separator through a second pipe, the air outlet of the miniature gas-liquid separator is connected to the air inlet of the second liquid reservoir through a third pipe; the liquid outlet of the miniature gas-liquid separator is connected to one end of the one-way stop valve, and the other end of the one-way stop valve is connected to the first pipe.

[0007] Furthermore, a first stop valve, a filter, a liquid supply solenoid valve, and an electric regulating valve are sequentially arranged on the first pipeline.

[0008] Furthermore, a sensor is arranged on the second pipeline, and a sensor stop valve is connected below the sensor.

[0009] Furthermore, the liquid outlet of the first liquid storage device is connected to the liquid inlet of the gas-liquid separator via a pipeline, and a liquid supply electric regulating valve is provided at the end of the pipeline.

[0010] Furthermore, a liquid level switch is installed on the micro gas-liquid separator.

[0011] Furthermore, the one-way stop valve is connected to the first pipeline between the electric regulating valve and the evaporator.

[0012] Furthermore, a second stop valve is provided on the third pipeline.

[0013] The beneficial effects of the utility model are:

[0014] The utility model installs a liquid supply electric regulating valve at the liquid supply port of the evaporator and a return air sensor near the return air port of the evaporator. The return air sensor controls the liquid supply opening degree of the liquid supply electric regulating valve of the evaporator, which can ensure that the system return air is in a zero overheat state, avoid the return air from carrying a large amount of liquid, and improve the system energy efficiency.

[0015] The utility model installs a micro gas-liquid separator and a liquid level switch at the return air port of the evaporator. When liquid refrigerant inevitably appears in the system return air pipeline, it can be separated in the micro gas-liquid separator, further solving the problem of liquid in the return air; and a one-way stop valve is connected between the pipeline connecting the liquid outlet of the micro gas-liquid separator and the liquid inlet of the evaporator, so as to prevent the refrigerant from flowing back to the micro gas-liquid separator, thereby ensuring the stability and safety of the system operation.

[0016] The utility model can effectively reduce the energy consumption caused by the pump liquid supply method of the traditional large height difference refrigeration system and the problem of excessive refrigerant filling caused by multiple liquid supply while ensuring the stable operation of the refrigeration system using the gravity liquid supply method, which is beneficial to energy conservation and emission reduction; it can also solve the influence of the static liquid column of the large height difference gravity liquid supply system on the heat exchange of the evaporator; and the refrigeration terminal adopts an oil-free cooling method, so the heat exchange efficiency of the evaporator will not be affected by the oil film; in addition, the system adopts gravity liquid supply, and the machine room can be set on the roof without occupying the warehouse volume, which can effectively increase the warehouse capacity.

[0017] The utility model has a strong application prospect in cold storage projects with large height differences. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the utility model.

[0020] Description of Figure Numbers:

[0021] 1. Refrigeration compressor; 2. Oil separator; 3. Condenser; 4. First liquid reservoir; 5. Liquid supply electric regulating valve; 6. Gas-liquid separator; 7. Heat exchanger; 8. Second liquid reservoir; 9. First stop valve; 10. Filter; 11. Liquid supply solenoid valve; 12. Electric regulating valve; 13. Evaporator; 14. Stop valve for sensor; 15. Sensor; 16. Micro gas-liquid separator; 17. Second stop valve; 18. One-way stop valve; 19. Liquid level switch. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0026] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0027] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0028] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0029] The utility model provides a technical solution: a large height difference gravity liquid supply refrigeration system, such as Figure 1 As shown, it includes a refrigeration compressor 1, the air intake of the refrigeration compressor 1 is connected to the air outlet of the gas-liquid separator 6, the exhaust port of the refrigeration compressor 1 is connected to the air inlet of the oil separator 2, the exhaust port of the oil separator 2 is connected to the air inlet of the condenser 3, the liquid outlet of the condenser 3 is connected to the liquid inlet of the first liquid reservoir 4, the liquid outlet of the first liquid reservoir 4 is connected to the liquid inlet of the gas-liquid separator 6, the liquid outlet of the gas-liquid separator 6 is connected to the liquid inlet of the first refrigerant of the heat exchanger 7, the air outlet of the first refrigerant of the heat exchanger 7 is connected to the air inlet of the gas-liquid separator 6, the air inlet and liquid outlet of the second refrigerant of the heat exchanger 7 The ports are respectively connected to the air outlet and liquid inlet of the second liquid reservoir 8, the liquid outlet of the second liquid reservoir 8 is connected to one end of the evaporator 13 through a first pipe, the other end of the evaporator 13 is connected to the micro gas-liquid separator 16 through a second pipe, the micro gas-liquid separator 16 is equipped with a liquid level switch 19, the air outlet of the micro gas-liquid separator 16 is connected to the air inlet of the second liquid reservoir (also serving as a gas-liquid separator) 8 through a third pipe; the liquid outlet of the micro gas-liquid separator 16 is connected to one end of a one-way stop valve 18, the other end of the one-way stop valve 18 is connected to the first pipe between the electric regulating valve 12 and the evaporator 13.

[0030] The first pipeline is provided with a first stop valve 9, a filter 10, a liquid supply solenoid valve 11, and an electric regulating valve 12 in sequence.

[0031] The second pipeline is provided with a sensor 15, and the lower part of the sensor 15 is connected with a sensor stop valve 14.

[0032] The liquid outlet of the first liquid storage device 4 is connected to the liquid inlet of the gas-liquid separator 6 through a pipeline, and a liquid supply electric regulating valve 5 is provided at the end of the pipeline.

[0033] Example 1

[0034] When the gravity liquid supply method is used in the large height difference liquid supply refrigeration system, the main refrigeration equipment: refrigeration unit, condensation evaporation skid, condenser can be installed at a position higher than the evaporator, such as the roof of the cold storage. The liquid refrigerant flows to the terminal evaporator under the action of siphon, absorbs heat in the evaporator and becomes gaseous, and then returns to the condensation evaporation skid, condenses into liquid through the condensation evaporator, and reciprocates for refrigeration. This embodiment uses two refrigerants, Freon and carbon dioxide, as reference.

[0035] Specifically include: Freon refrigeration compressor 1, Freon oil separator 2, Freon condenser 3, Freon liquid reservoir 4, Freon liquid supply electric regulating valve 5, Freon gas-liquid separator 6, Freon / carbon dioxide heat exchanger 7, carbon dioxide liquid reservoir (also serving as carbon dioxide gas-liquid separator) 8, stop valve 9, filter 10, solenoid valve 11, electric regulating valve 12, carbon dioxide evaporator 13, stop valve 14 for sensor, sensor 15, micro gas-liquid separator 16, stop valve 17, one-way stop valve 18, liquid level switch 19 for micro gas-liquid separator.

[0036] The interface of the Freon refrigeration compressor 1 is divided into two paths, one is the air intake end: the air intake port of the Freon refrigeration compressor 1 is connected to the air outlet of the Freon gas-liquid separator 6 through a pipeline, and the other is the exhaust end: the exhaust port of the Freon refrigeration compressor 1 is connected to the air inlet of the Freon oil separator 2 through a pipeline;

[0037] The exhaust port of the Freon oil separator 2 is connected to the air inlet of the Freon condenser 3 through a pipeline;

[0038] The liquid outlet of the Freon condenser 3 is connected to the liquid inlet of the Freon liquid reservoir 4 through a pipeline;

[0039] The liquid outlet of the Freon liquid storage device 4 is connected to the liquid inlet of the Freon gas-liquid separator 6 through a pipeline, and a Freon liquid supply electric regulating valve 5 is arranged at the end of the pipeline;

[0040] The Freon / CO2 heat exchanger 7 has two sets of refrigerant interfaces, one of which is a Freon refrigerant interface, the liquid inlet of which is connected to the liquid outlet of the Freon gas-liquid separator 6 through a pipeline; the gas outlet is connected to the gas inlet of the Freon gas-liquid separator 6 through a pipeline; the other set is a CO2 refrigerant interface, the gas inlet and liquid outlet are respectively connected to the gas outlet and liquid inlet of the CO2 liquid storage device (also serving as the CO2 gas-liquid separator) 8;

[0041] The liquid outlet of the carbon dioxide liquid storage device (also serving as a carbon dioxide gas-liquid separator) 8 is connected in sequence with a stop valve 9, a filter 10, a solenoid valve 11, an electric regulating valve 12 and a carbon dioxide evaporator 13 through pipelines;

[0042] The carbon dioxide evaporator 13 is connected to the micro gas-liquid separator 16 through a pipeline, and a sensor 15 and a sensor stop valve 14 are installed on the connecting pipeline;

[0043] The micro gas-liquid separator 16 is provided with a liquid level switch 19 for the micro gas-liquid separator;

[0044] The liquid outlet of the micro gas-liquid separator 16 is connected to the one-way stop valve 18 through a pipeline;

[0045] The one-way stop valve 18 is connected to the liquid supply pipeline between the electric regulating valve 12 and the carbon dioxide evaporator 13 through a pipeline;

[0046] The gas outlet of the micro gas-liquid separator 16 is connected to the gas inlet of the carbon dioxide liquid storage device (also serving as the carbon dioxide gas-liquid separator) 8 through a pipeline via a stop valve 17 .

[0047] The main refrigeration equipment in the machine room includes Freon condenser 3, Freon liquid storage tank 4, Freon refrigeration unit, Freon / carbon dioxide condensation evaporation skid, wherein the refrigeration unit includes: Freon refrigeration compressor 1, Freon oil separator 2; Freon / carbon dioxide condensation evaporation skid includes: Freon liquid supply electric regulating valve 5, Freon gas-liquid separator 6, Freon / carbon dioxide heat exchanger 7, carbon dioxide liquid storage tank (also used as carbon dioxide gas-liquid separator) 8, and each refrigeration equipment is connected through refrigeration pipelines;

[0048] During operation, the gaseous carbon dioxide from the cold room terminal evaporator 13 is separated by the carbon dioxide reservoir (also serving as a carbon dioxide gas-liquid separator) 8, and then enters the Freon / carbon dioxide heat exchanger 7 to exchange heat with Freon. The carbon dioxide is condensed from gas to liquid and enters the carbon dioxide reservoir (also serving as a carbon dioxide gas-liquid separator) 8, and the Freon is converted from liquid to gas and returns to the Freon gas-liquid separator 6; the gaseous refrigerant in the Freon gas-liquid separator 6 is extracted and compressed by the Freon compressor 1 and discharged into the Freon oil separator 2, and then enters the Freon condenser 3, and the Freon is converted from gas to liquid in the condenser 3 and flows into the Freon reservoir 4. The liquid refrigerant in the Freon reservoir 4 flows through the Freon liquid supply electric regulating valve 5 according to the liquid level requirement of the Freon gas-liquid separator 6 in the condensation evaporation skid, enters the Freon gas-liquid separator 6, and then flows into the Freon / carbon dioxide heat exchanger 7 to exchange heat with carbon dioxide;

[0049] The main refrigeration equipment in the cold room is a carbon dioxide evaporator 13 and a micro gas-liquid separator 16; the liquid supply port of the carbon dioxide evaporator 13 is connected to the liquid outlet of the carbon dioxide liquid reservoir (also serving as a carbon dioxide gas-liquid separator) 8 in the machine room through a refrigeration pipeline, and a stop valve 9, a filter 10, a liquid supply solenoid valve 11, and an electric regulating valve 12 are installed therebetween in sequence; the air return port of the carbon dioxide evaporator 13 is connected to the micro gas-liquid separator 16 through a pipeline, and a sensor 15 is installed between the air return port of the carbon dioxide evaporator 13 and the micro gas-liquid separator 16; the micro gas-liquid separator 16 is connected to the air inlet of the carbon dioxide liquid reservoir (also serving as a carbon dioxide gas-liquid separator) 8 through a stop valve 17 and a pipeline; the air outlet of the carbon dioxide liquid reservoir (also serving as a carbon dioxide gas-liquid separator) 8 is connected to the air inlet of the Freon / carbon dioxide heat exchanger 7 in the machine room through a pipeline; the Freon / The liquid outlet of the carbon dioxide heat exchanger 7 is connected to the liquid inlet of the carbon dioxide reservoir (also serving as a carbon dioxide gas-liquid separator) 8 through a pipeline; the liquid refrigerant from the carbon dioxide reservoir (also serving as a carbon dioxide gas-liquid separator) 8 in the machine room enters the carbon dioxide evaporator 13 through the liquid supply pipeline; the carbon dioxide in the evaporator 13 changes from liquid to gas through heat exchange with the outside; the gaseous carbon dioxide enters the micro gas-liquid separator 16 through the return air port of the evaporator 13, and then enters the carbon dioxide reservoir (also serving as a carbon dioxide gas-liquid separator) 8 in the machine room and then enters the Freon / carbon dioxide heat exchanger 7 to exchange heat with Freon; during the refrigeration process of the carbon dioxide evaporator 13, the liquid supply electric regulating valve 12 can adjust its own opening degree according to the information fed back to the system by the return air end sensor 15, so as to ensure that the liquid supply of the evaporator 13 is stable and the return air is in a zero superheated steam state;

[0050] The liquid outlet of the micro gas-liquid separator 16 and the one-way stop valve 18 are connected in sequence through pipelines to the pipelines connected to the liquid supply electric regulating valve 12 and the liquid inlet of the carbon dioxide evaporator 13; a liquid level switch 19 is installed on the micro gas-liquid separator 16; when the refrigerant liquid level in the micro gas-liquid separator 16 reaches the liquid level of the liquid level switch 19, the liquid level switch 19 will feedback a signal to the liquid supply solenoid valve 11 and close the liquid supply solenoid valve 11; after the liquid supply solenoid valve 11 is closed, when the evaporator 13 is cooled normally, the liquid refrigerant in the micro gas-liquid separator 16 can enter the evaporator 13 through the liquid outlet to participate in the circulating refrigeration, and when the refrigerant reaches below the safe liquid level, a signal can be fed back and the liquid supply solenoid valve 11 can be opened to ensure the system liquid supply.

[0051] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A large height difference gravity liquid supply refrigeration system, characterized in that: The invention comprises a refrigeration compressor (1), wherein the air intake port of the refrigeration compressor (1) is connected to the air outlet port of a gas-liquid separator (6), the air exhaust port of the refrigeration compressor (1) is connected to the air inlet port of an oil separator (2), the air exhaust port of the oil separator (2) is connected to the air inlet port of a condenser (3), the liquid outlet port of the condenser (3) is connected to the liquid inlet port of a first liquid reservoir (4), the liquid outlet port of the first liquid reservoir (4) is connected to the liquid inlet port of the gas-liquid separator (6), the liquid outlet port of the gas-liquid separator (6) is connected to the liquid inlet port of a first refrigerant of a heat exchanger (7), the air outlet port of the first refrigerant of the heat exchanger (7) is connected to the air inlet port of the gas-liquid separator (6), The air inlet of the heat exchanger (7) is connected, the air inlet and liquid outlet of the second refrigerant of the heat exchanger (7) are respectively connected to the air outlet and liquid inlet of the second liquid reservoir (8), the liquid outlet of the second liquid reservoir (8) is connected to the liquid supply port of the evaporator (13) through a first pipeline, the air return port of the evaporator (13) is connected to the micro gas-liquid separator (16) through a second pipeline, the air outlet of the micro gas-liquid separator (16) is connected to the air inlet of the second liquid reservoir (8) through a third pipeline; the liquid outlet of the micro gas-liquid separator (16) is connected to one end of a one-way stop valve (18), and the other end of the one-way stop valve (18) is connected to the first pipeline.

2. The large height difference gravity liquid supply refrigeration system according to claim 1 is characterized in that: The first pipeline is provided with a first stop valve (9), a filter (10), a liquid supply solenoid valve (11), and an electric regulating valve (12) in sequence.

3. The large height difference gravity liquid supply refrigeration system according to claim 1, characterized in that: A sensor (15) is arranged on the second pipeline, and a sensor stop valve (14) is connected below the sensor (15).

4. The large height difference gravity liquid supply refrigeration system according to claim 1, characterized in that: The liquid outlet of the first liquid storage device (4) is connected to the liquid inlet of the gas-liquid separator (6) via a pipeline, and a liquid supply electric regulating valve (5) is provided at the end of the pipeline.

5. The large height difference gravity liquid supply refrigeration system according to claim 1, characterized in that: A liquid level switch (19) is installed on the micro gas-liquid separator (16).

6. The large height difference gravity liquid supply refrigeration system according to claim 1, characterized in that: The one-way stop valve (18) is connected to the first pipeline between the electric regulating valve (12) and the evaporator (13).

7. The large height difference gravity liquid supply refrigeration system according to claim 1, characterized in that: The third pipeline is provided with a second stop valve (17).

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