Evaporation and condensation type water chilling unit

Abstract

The evaporation and condensation type water chilling unit comprises a compressor, an evaporation type condenser, a throttling element and an evaporator which are sequentially communicated in the flowing direction of refrigerants, the evaporator is connected and communicated with a first water inlet pipe and a first water return pipe, and the evaporation type condenser is connected and communicated with a second water inlet pipe and a second water return pipe. The second water inlet pipe and the first water inlet pipe are communicated in parallel, a second flow control valve is arranged on the first water inlet pipe, and a second flow control valve is arranged on the second water inlet pipe; the evaporative condensation type water chilling unit has a mechanical refrigeration state and a natural cooling state; in the mechanical refrigeration state, the compressor is started, the first flow control valve is closed, and the second flow control valve is opened; in the natural cooling state, the compressor is closed, the first flow control valve is opened, and the second flow control valve is closed. Therefore, the evaporation and condensation type water chilling unit has a natural cooling function, and the refrigeration energy efficiency ratio of the evaporation and condensation type water chilling unit can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to refrigeration, and particularly relates to an evaporative condensing water chiller. Background Art

[0002] An evaporative condensing chiller usually includes a compressor, an evaporative condenser, a throttling element and an evaporator which are connected in sequence along the flow direction of the refrigerant. When the evaporative condensing chiller is working, the compressor needs to be turned on to do work so that the evaporative condenser can use water and air as water, and use the evaporation of water to take away the heat of the gaseous refrigerant in the evaporative condenser to realize the condensation of the refrigerant and achieve the purpose of refrigeration operation.

[0003] Among them, when evaporative condensing chillers are used in computer rooms, chemical and pharmaceutical process plants, large supermarkets and other scenarios, evaporative condensing chillers are required to provide year-round refrigeration. At present, the existing evaporative condensing chillers require the compressor to be started all the time and perform mechanical refrigeration for year-round refrigeration operation. However, the energy consumption required for the compressor to start working is relatively high, which makes the energy efficiency of evaporative condensing chillers relatively low in transition seasons or partial load operation. Utility Model Content

[0004] In view of this, it is necessary to provide an evaporative condensing chiller for solving the above-mentioned technical problems.

[0005] An evaporative condensing water chiller comprises a compressor, an evaporative condenser, a throttling element and an evaporator, wherein the compressor, the evaporative condenser, the throttling element and the evaporator are sequentially connected along the flow direction of the refrigerant;

[0006] The evaporator is provided with a water outlet and a water inlet, the water outlet is connected to the water tank of the evaporative condenser through the first water return pipe and the second water return pipe in sequence, and the water inlet is connected to the spray mechanism of the evaporative condenser through the first water inlet pipe and the second water inlet pipe in sequence;

[0007] The evaporative condensing chiller also includes an external flow path, which includes a water inlet main pipe and a water return main pipe, wherein the water inlet main pipe is located between the first water inlet pipe and the second water inlet pipe and is in communication with the first water inlet pipe and the second water inlet pipe; the water return main pipe is located between the first water return pipe and the second water return pipe and is in communication with the first water return pipe and the second water return pipe; the external flow path is arranged in parallel with the evaporative condenser;

[0008] A first flow control valve is provided on the second water inlet pipe, and a second flow control valve is provided on the first water inlet pipe. The evaporative condensing chiller has a mechanical refrigeration state and a natural cooling state; in the mechanical refrigeration state, the compressor is started, the first flow control valve is closed, and the second flow control valve is opened; in the natural cooling state, the compressor is turned off, the first flow control valve is opened, and the second flow control valve is closed.

[0009] In one embodiment, the first flow control valve and / or the second flow control valve is configured as a butterfly valve or a solenoid valve.

[0010] It can be understood that the first flow control valve and / or the second flow control valve is configured as a butterfly valve or a solenoid valve so that the corresponding first flow control valve and / or the corresponding second flow control valve can be made of local materials, which has the effect of reducing costs.

[0011] In one embodiment, the evaporative condenser further comprises a water pump and a coil, the water pump is respectively connected to the spray mechanism and the water tank, and when the water pump is working, it can pump the water collected in the water tank back to the spray mechanism;

[0012] The coil is arranged between the spray mechanism and the water tank, and the coil supplies refrigerant when the compressor is started. When the spray mechanism is working, the water sprayed into the water tank can exchange heat with the external atmosphere and / or the refrigerant in the coil.

[0013] In one of the embodiments, the evaporative condenser further includes a fan, which is disposed above the water tank in the direction of gravity and is used to exhaust air in the area between the fan and the water tank.

[0014] It is understandable that using a fan to pump out the air above the water tank can accelerate the discharge of air from the evaporative condenser, thereby improving the cooling effect of the evaporative condenser when it is working.

[0015] In one of the embodiments, a temperature detection sensor is disposed on the water tank, and a detection portion of the temperature detection sensor is disposed in the water in the water tank for detecting the temperature of the water in the water tank.

[0016] It is understandable that the temperature of the water in the water tank is detected by using a temperature detection sensor, so that the temperature of the water in the water tank can be automatically detected.

[0017] In one of the embodiments, an electric heater is disposed in the water tank, and the electric heater is disposed in the water in the water tank to heat the water in the water tank.

[0018] It is understandable that the water in the water tank is heated by an electric heater, so that the water in the water tank can be prevented from freezing due to the low external atmospheric temperature, thereby ensuring that the water in the evaporative condenser can circulate between the spray mechanism and the water tank.

[0019] In one of the embodiments, a drain valve is provided on the water tank. The drain valve is arranged at the bottom of the water tank and is connected to the water tank for draining the water in the water tank.

[0020] It is understandable that the water in the water tank is discharged by using a drain valve, which can facilitate the subsequent replacement of the water in the water tank, thus preventing the water in the water tank from scaling.

[0021] In one embodiment, the evaporative condensing chiller further includes an oil separator, which is connected between the compressor and the evaporative condenser, and the refrigerant discharged from the compressor can pass through the oil separator and be introduced into the evaporative condenser.

[0022] It can be understood that by utilizing the structural characteristics of the oil separator, the lubricating oil contained in the refrigerant discharged from the compressor to the evaporative condenser can be separated, thereby ensuring the safe and efficient operation of the evaporative condensing chiller.

[0023] In one embodiment, the evaporative condensing chiller further includes a drying filter, which is connected between the evaporative condenser and the throttling element, and the refrigerant discharged from the evaporative condenser can pass through the drying filter and be introduced into the throttling element.

[0024] It can be understood that by utilizing the structural characteristics of the drying filter, impurities contained in the refrigerant discharged from the evaporative condenser to the throttling element can be filtered, thereby ensuring the safe and efficient operation of the evaporative condensing chiller.

[0025] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0026] The evaporative condensing chiller for which protection is sought in the present application can achieve a natural cooling function by performing heat exchange in the evaporative condenser with the external atmosphere at the location of the evaporative condenser and the water in the second water inlet pipe and the second water return pipe. During this process, the compressor is turned off and no energy is consumed. In this way, the evaporative condensing chiller can have a natural cooling function, so that the evaporative condensing chiller only needs to turn on the natural cooling function in transitional seasons or in winter to meet the refrigeration requirements in the application scenarios in which the evaporative condensing chiller is used, thereby improving the refrigeration energy efficiency ratio of the evaporative condensing chiller. At the same time, by switching the first flow control valve and the second flow control valve, the switching control between the mechanical refrigeration state and the natural cooling state of the evaporative condensing chiller can be realized when the evaporative condensing chiller is working. In this way, the switching control of the working state of the evaporative condensing chiller can be facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram of the structure of an evaporative condensing water chiller provided in an embodiment of the present application, wherein the evaporative condensing water chiller is in a natural cooling working state;

[0029] Figure 2 A schematic diagram of the structure of an evaporative condensing water chiller provided in an embodiment of the present application, wherein the evaporative condensing water chiller is in a working state of mechanical refrigeration by a compressor;

[0030] Figure 3 This is a schematic structural diagram of an evaporative condenser provided in one embodiment of the present application.

[0031] 1. Evaporative condensing chiller; 2. Compressor; 3. Evaporative condenser; 4. Spray mechanism; 5. Coil; 6. Water tank; 7. Temperature detection sensor; 8. Electric heater; 9. Drain valve; 10. Water pump; 11. Pipeline; 12. Fan; 13. Filler; 14. Water baffle; 15. Throttling element; 16. Evaporator; 17. Water outlet; 18. Water inlet; 19. First water inlet pipe; 20. Second flow control valve; 21. First water return pipe; 22. Oil separator; 23. Dry filter; 24. Second water inlet pipe; 25. First flow control valve; 26. Second water return pipe; 27. Water baffle; 30. Throttling element; 40. Evaporator; 401. Water outlet; 402. Water inlet; 41. First water inlet pipe; 411. Second flow control valve; 42. First water return pipe; 50. Oil separator; 60. Dry filter; 101. Second water inlet pipe; 1011. First flow control valve; 102. Second water return pipe; 103. Water inlet main pipe; 104. Water return main pipe. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions 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. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that when an element is referred to as being "provided on" another element, it may be directly provided on the other element or there may be a central element. When an element is considered to be "provided on" another element, it may be directly provided on the other element or there may be a central element at the same time. When an element is considered to be "fixed to" another element, it may be directly fixed to the other element or there may be a central element at the same time.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] like Figure 1 , Figure 2 As shown, an evaporative condensing chiller 100 provided in one embodiment of the present application includes a compressor 10, an evaporative condenser 20, a throttling element 30 and an evaporator 40, and the compressor 10, the evaporative condenser 20, the throttling element 30 and the evaporator 40 are connected in sequence along the flow direction of the refrigerant; a water outlet 401 and a water inlet 402 are provided on the evaporator 40, the water outlet 401 is connected to the water tank 23 of the evaporative condenser 20 through the first return water pipe 42 and the second return water pipe 102 in sequence, and the water inlet 402 is connected to the spray mechanism 21 of the evaporative condenser 20 through the first water inlet pipe 41 and the second water inlet pipe 101 in sequence.

[0036] The evaporative condensing chiller 100 also includes an external flow path, which includes a water inlet main pipe 103 and a water return main pipe 104. The water inlet main pipe 103 is located between the first water inlet pipe 41 and the second water inlet pipe 101, and is connected to the first water inlet pipe 41 and the second water inlet pipe 101; the water return main pipe 104 is located between the first water return pipe 42 and the second water return pipe 102, and is connected to the first water return pipe 42 and the second water return pipe 102; the external flow path is arranged in parallel with the evaporative condenser 20; a first flow control valve 1011 is arranged on the second water inlet pipe 101, and a second flow control valve 411 is arranged on the first water inlet pipe 41. In the mechanical refrigeration state, the compressor 10 is started, the first flow control valve 1011 is closed, and the second flow control valve 411 is opened; in the natural cooling state, the compressor 10 is turned off, the first flow control valve 1011 is opened, and the second flow control valve 411 is closed. It should be noted that in the mechanical refrigeration state of the evaporative condensing chiller 100, the working principle of how the refrigerant circulates after the compressor 10 is turned on can adopt the conventional method of the existing evaporative condensing chiller, which will not be elaborated here.

[0037] It can be understood that the external atmosphere at the location of the evaporative condenser 20 and the water conducted in the second water inlet pipe 101 and the second water return pipe 102 can be used to perform heat exchange in the evaporative condenser 20 to achieve the function of natural cooling. In this process, the compressor 10 is turned off and no energy is consumed. In this way, the evaporative condensing chiller 100 can have the function of natural cooling, so that the evaporative condensing chiller 100 only needs to turn on the natural cooling function in the transition season or winter to meet the refrigeration requirements in the application scenarios where the evaporative condensing chiller 100 is used, which can improve the refrigeration energy efficiency ratio of the evaporative condensing chiller 100; at the same time, by switching the first flow control valve 1011 and the second flow control valve 411, the switching control between the mechanical refrigeration state and the natural cooling state of the evaporative condensing chiller 100 is realized when the evaporative condensing chiller 100 is working, which can facilitate the switching control of the working state of the evaporative condensing chiller 100.

[0038] In this embodiment, the first flow control valve 1011 and / or the second flow control valve 411 are configured as butterfly valves or solenoid valves, so that the corresponding first flow control valve 1011 and / or the corresponding second flow control valve 411 can be made of local materials, which has the effect of reducing costs. Of course, in other embodiments, the first flow control valve 1011 and / or the second flow control valve 411 can also be configured as manual valves.

[0039] like Figure 3As shown, in one embodiment, the evaporative condenser 20 further includes a water pump 24 and a coil 22. The water pump 24 is connected to the spray mechanism 21 and the water tank 23 respectively, and the water pump 24 can pump the water collected in the water tank 23 back to the spray mechanism 21 when it is working; wherein the coil 22 is arranged between the spray mechanism 21 and the water tank 23, and the coil 22 supplies the refrigerant flow when the compressor 10 is started. When the spray mechanism 21 is working, the water sprayed to the water tank 23 can exchange heat with the external atmosphere and / or the refrigerant in the coil 22. Here, the water pump 24 is arranged on the pipeline 241 connecting the water tank 23 and the spray mechanism 21, and the spray mechanism 21 is a conventional structure of the spray device in the existing evaporative condenser 20, which will not be elaborated here. When the evaporative condenser 20 is working, the spray mechanism 21 discharges water toward the coil 22 in a spraying manner, and the water falls into the water tank 23 through the coil 22. Then, the water collected in the water tank 23 is pumped into the spray mechanism 21 by the water pump 24, and the water circulates in the evaporative condenser 20. During this process, the water can exchange heat with the refrigerant conducted in the coil 22, and the refrigeration operation of the evaporative condenser 20 is realized.

[0040] like Figure 3 As shown, in this embodiment, the evaporative condenser 20 further includes a fan 25, which is arranged above the water tank 23 in the direction of gravity, and is used to exhaust the air in the area between the fan 25 and the water tank 23, so that the air can be discharged from the evaporative condenser 20 at an accelerated speed, thereby improving the cooling effect of the evaporative condenser 20 when working. Here, the fan 25 is set as an axial flow fan.

[0041] like Figure 3 As shown, in this embodiment, the evaporative condenser 20 also includes a filler 26, which is arranged corresponding to the spray mechanism 21, and the water discharged from the spray mechanism 21 can pass through the coil 22 and the filler 26 in sequence and fall into the water tank 23. In this process, the filler 26 can be used to filter impurities contained in the water. In addition, the evaporative condenser 20 also includes a water baffle 27, which is arranged corresponding to the filler 26. The water baffle 27 is arranged on the inner side of the corresponding filler 26, so that when the external air passes through the filler 26 and the water baffle 27 and enters the upper position of the water tank 23, the water baffle 27 can be used to block the water in the area where the filler 26 is located from entering, thereby preventing the air discharged by the fan 25 from carrying water.

[0042] like Figure 3As shown, in this embodiment, a temperature detection sensor 231 is provided in the water tank 23, and the detection part of the temperature detection sensor 231 is provided in the water in the water tank 23, and is used to detect the temperature of the water in the water tank 23, so that the evaporative condenser 20 can realize automatic detection of the water temperature in the water tank 23, and can use this as a basis to judge whether the working state of the evaporative condensing chiller 100 meets the use requirements of switching to the natural cooling state.

[0043] like Figure 3 As shown, in this embodiment, an electric heater 232 is also provided in the water tank 23. The electric heater 232 is arranged in the water in the water tank 23 and is used to heat the water in the water tank 23. In this way, the water in the water tank 23 can be prevented from freezing due to the low external atmospheric temperature. This ensures that the water in the evaporative condenser 20 can circulate between the spray mechanism 21 and the water tank 23.

[0044] like Figure 3 As shown, in this embodiment, a drain valve 233 is provided on the water tank 23. The drain valve 233 is set at the bottom of the water tank 23 and is connected to the water tank 23, and is used to drain the water in the water tank 23 externally. In this way, it is convenient to replace the water in the water tank 23 later, which can prevent the water in the water tank 23 from scaling.

[0045] As can be seen from the above, when the evaporative condensing chiller 100 of the present application is working, when the compressor 10 is required for mechanical refrigeration, the compressor 10 is turned on, the first flow control valve 1011 can be closed, and the second flow control valve 411 can be opened to connect the second water inlet pipe 101 and the first water inlet pipe 41 respectively; when it is necessary to control the evaporative condensing chiller 100 to start the natural cooling function, the compressor 10 is turned off, and the first flow control valve 1011 is opened at the same time, and the second flow control valve 411 is closed to connect the second water inlet pipe 101 and disconnect the first water inlet pipe 41. In this way, the dry-bulb temperature difference of the air is utilized to output water with a lower temperature, and a cooling temperature close to the sub-wet-bulb temperature of the air and water with a larger cooling capacity can be directly obtained. In this process, since the sum of the rated power of the fan 25 and the water pump 24 is only 5%-15% of the rated power of the compressor 10, the refrigeration energy efficiency ratio of the evaporative condensing chiller 100 will be greatly improved without turning on the compressor 10.

[0046] like Figure 1 , Figure 2As shown, in one embodiment, the evaporative condensing chiller 100 further includes an oil separator 50, which is connected between the compressor 10 and the evaporative condenser 20, and the refrigerant discharged from the compressor 10 can pass through the oil separator 50 and be introduced into the evaporative condenser 20. In this way, the oil separator 50 can be used to separate the lubricating oil contained in the refrigerant discharged from the compressor 10 to the evaporative condenser 20, so that the evaporative condensing chiller 100 can be guaranteed to operate safely and efficiently. Here, the lubricating oil contained in the refrigerant specifically refers to the lubricating oil required to be used when the compressor 10 is working. It should be noted that the specific structure of the oil separator 50 and the working principle of how to separate the lubricating oil in the refrigerant during operation can all adopt the conventional method of the existing oil separator, which will not be elaborated here.

[0047] like Figure 1 , Figure 2 As shown, in one embodiment, the evaporative condensing chiller 100 further includes a filter dryer 60, which is connected between the evaporative condenser 20 and the throttling element 30, and the refrigerant discharged from the evaporative condenser 20 can pass through the filter dryer 60 and be introduced into the throttling element 30. In this way, the filter dryer 60 can be used to filter the impurities contained in the refrigerant discharged from the evaporative condenser 20 to the throttling element 30, so that the evaporative condensing chiller 100 can be ensured to operate safely and efficiently.

[0048] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection required by the present invention.

Claims

1. An evaporative condensing water chiller, comprising a compressor (10), an evaporative condenser (20), a throttling element (30) and an evaporator (40), wherein the compressor (10), the evaporative condenser (20), the throttling element (30) and the evaporator (40) are sequentially connected along a flow direction of a refrigerant; It is characterized in that The evaporator (40) is provided with a water outlet (401) and a water inlet (402); the water outlet (401) is connected to the water tank (23) of the evaporative condenser (20) through a first water return pipe (42) and a second water return pipe (102) in sequence; and the water inlet (402) is connected to the spray mechanism (21) of the evaporative condenser (20) through a first water inlet pipe (41) and a second water inlet pipe (101) in sequence; The evaporative condensing chiller (100) further comprises an external flow path, the external flow path comprising a water inlet main pipe (103) and a water return main pipe (104); the water inlet main pipe (103) is located between the first water inlet pipe (41) and the second water inlet pipe (101), and is in communication with the first water inlet pipe (41) and the second water inlet pipe (101); the water return main pipe (104) is located between the first water return pipe (42) and the second water return pipe (102), and is in communication with the first water return pipe (42) and the second water return pipe (102); the external flow path is arranged in parallel with the evaporative condenser (20); The second water inlet pipe (101) is provided with a first flow control valve (1011), the first water inlet pipe (41) is provided with a second flow control valve (411), and the evaporative condensing chiller (100) has a mechanical refrigeration state and a natural cooling state; in the mechanical refrigeration state, the compressor (10) is started, the first flow control valve (1011) is closed, and the second flow control valve (411) is opened; in the natural cooling state, the compressor (10) is closed, the first flow control valve (1011) is opened, and the second flow control valve (411) is closed.

2. The evaporative condensing chiller according to claim 1, characterized in that: The first flow control valve (1011) and / or the second flow control valve (411) are configured as butterfly valves or solenoid valves.

3. The evaporative condensing chiller according to claim 1, characterized in that: The evaporative condenser (20) further comprises a water pump (24) and a coil (22), wherein the water pump (24) is respectively connected to the spray mechanism (21) and the water tank (23), and when the water pump (24) is in operation, it can pump water collected in the water tank (23) back to the spray mechanism (21); The coil (22) is arranged between the spray mechanism (21) and the water tank (23); the coil (22) supplies refrigerant when the compressor (10) is started; and the water sprayed into the water tank (23) by the spray mechanism (21) when working can exchange heat with the external atmosphere and / or the refrigerant in the coil (22).

4. The evaporative condensing chiller according to claim 1, characterized in that: The evaporative condenser (20) further comprises a fan (25), wherein the fan (25) is arranged above the water tank (23) in the direction of gravity and is used to exhaust air in the area between the fan (25) and the water tank (23).

5. The evaporative condensing chiller according to claim 1, characterized in that: The water tank (23) is provided with a temperature detection sensor (231), and a detection portion of the temperature detection sensor (231) is arranged in the water in the water tank (23) and is used to detect the temperature of the water in the water tank (23).

6. The evaporative condensing chiller according to claim 1, characterized in that: An electric heater (232) is arranged in the water tank (23); the electric heater (232) is arranged in the water in the water tank (23) and is used to heat the water in the water tank (23).

7. The evaporative condensing chiller according to claim 1, characterized in that: The water tank (23) is provided with a drain valve (233), which is arranged at the bottom of the water tank (23) and is in communication with the water tank (23) for draining water from the water tank (23).

8. The evaporative condensing chiller according to claim 1, characterized in that: The evaporative condensing chiller (100) further includes an oil separator (50), wherein the oil separator (50) is connected between the compressor (10) and the evaporative condenser (20), and the refrigerant discharged from the compressor (10) can pass through the oil separator (50) and be introduced into the evaporative condenser (20).

9. The evaporative condensing chiller according to claim 1, characterized in that: The evaporative condensing water chiller (100) further comprises a drying filter (60), wherein the drying filter (60) is connected between the evaporative condenser (20) and the throttling element (30), and the refrigerant discharged from the evaporative condenser (20) can pass through the drying filter (60) and be introduced into the throttling element (30).

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