阅读说明：本技术 蒸发冷却式直膨机组及其控制方法 (Evaporative cooling type direct expansion unit and control method thereof ) 是由 陈培生 郑乔扬 刘洋 于 2020-12-10 设计创作，主要内容包括：本发明提供一种蒸发冷却式直膨机组及其控制方法,其中的蒸发冷却式直膨机组,包括压缩机、冷凝器、节流装置、蒸发器,所述压缩机、冷凝器、节流装置、蒸发器顺次连接形成冷媒制冷循环,所述压缩机为气悬浮压缩机。根据本发明,一方面采用了气悬浮压缩机能够无需针对其设计相应的冷却润滑油路,从而能够使所述机组的系统设计更加简单,有效避免采用冷却润滑油路的系统中油位过高或者过低产生的不利影响；另一方面采用所述蒸发器的冷媒直膨实现空间制冷无需现有技术中的常规冷水主机及末端的型式,从而能够提升机组系统的换热效率,并使机组结构更加紧凑,占地面积更小。(The invention provides an evaporation cooling type direct expansion unit and a control method thereof, wherein the evaporation cooling type direct expansion unit comprises a compressor, a condenser, a throttling device and an evaporator, the compressor, the condenser, the throttling device and the evaporator are sequentially connected to form a refrigerant refrigeration cycle, and the compressor is an air suspension compressor. According to the invention, on one hand, the gas suspension compressor is adopted, and a corresponding cooling and lubricating oil way does not need to be designed aiming at the gas suspension compressor, so that the system design of the unit is simpler, and the adverse effect caused by overhigh or overlow oil level in the system adopting the cooling and lubricating oil way is effectively avoided; on the other hand, the refrigerant direct expansion of the evaporator is adopted to realize space refrigeration without a conventional cold water main machine and a tail end type in the prior art, so that the heat exchange efficiency of a unit system can be improved, the unit structure is more compact, and the occupied area is smaller.)

1. The evaporative cooling type direct expansion unit is characterized by comprising a compressor (1), a condenser (2), a throttling device (3) and an evaporator (4), wherein the compressor (1), the condenser (2), the throttling device (3) and the evaporator (4) are sequentially connected to form a refrigerant refrigeration cycle, and the compressor (1) is a gas suspension compressor.

2. The evaporative cooling type direct expansion unit according to claim 1, wherein the condenser (2) is an evaporative condenser, and a spraying device is arranged at the condenser (2) and can spray cooling water contained in the spraying device onto the condenser (2).

3. The evaporative cooled direct expansion unit according to claim 2, wherein the spray means comprises a water pump (53), a spray pipe (51) at the top of the condenser (2), and a water tank (52) at the bottom of the condenser (2), the water pump (53) being capable of pumping cooling water in the water tank (52) into the spray pipe (51).

4. The evaporative cooling type direct expansion unit according to claim 3, wherein a water baffle (54) is provided at an upper portion of the shower pipe (51).

5. The evaporative cooled direct expansion unit according to claim 3, characterized in that the condenser (2) is externally provided with a filler (55).

6. The evaporative cooling type direct expansion unit according to claim 1, further comprising a housing (61), wherein the housing (61) has a receiving space, the receiving space includes a condenser mounting space and an evaporator mounting space which are independent of each other, the evaporator (4) is mounted in the evaporator mounting space, and the compressor (1) and the condenser (2) are mounted in the condenser mounting space.

7. The evaporative cooling type direct expansion unit as claimed in claim 6, wherein a return air inlet (611) and a fresh air inlet (612) are formed on the housing (61) corresponding to the two opposite sides of the evaporator installation space, an air supply fan (41) is further arranged in the evaporator installation space, and the evaporator (4) is located between the air supply fan (41) and the return air inlet (611) and the fresh air inlet (612).

8. The evaporative cooling type direct expansion unit as set forth in claim 6, wherein a condensing fan (21) is further disposed at the top of the condenser installation space, and the condensing fan (21) can drive the cooling air flow to flow from bottom to top.

9. A control method of an evaporative cooling type direct expansion unit, which is used for controlling the evaporative cooling type direct expansion unit according to any one of claims 3 to 5, and comprises the following steps:

obtaining the supply air temperature T of the evaporator (4)_{Feeding device}And the user sets the temperature T_{Is provided with}；

Comparison T_{Is provided with}And T_{Feeding device}The magnitude relationship of (1);

and controlling and adjusting the running frequency of the compressor (1) and the running speed of the water pump (53) according to the size relation.

10. The control method according to claim 9,

when T is_{Feeding device}≤T_{Is provided with}When the running frequency of the compressor (1) is controlled to be reduced, and the running speed of the water pump (53) is controlled to be reduced; and/or the presence of a gas in the gas,

when T is_{Feeding device}＞T_{Is provided with}And controlling to increase the running frequency of the compressor (1) and controlling to increase the running speed of the water pump (53).

Technical Field

The invention belongs to the technical field of air conditioning, and particularly relates to an evaporative cooling type direct expansion unit and a control method thereof.

Background

The conventional water-cooling water chilling unit adopts a cooling tower and a cooling pipeline to provide cooling water for an air conditioning system, so that the system has low heat exchange efficiency and complex equipment. The conventional cold water main machine usually adopts a magnetic suspension centrifugal compressor, a conventional centrifugal compressor, a screw compressor or a scroll compressor, the magnetic suspension compressor does not need to be equipped with lubricating oil, but needs to be equipped with an electromagnetic bearing, a position sensor, a standby bearing and a series of complex control systems, and meanwhile, the magnetic suspension compressor has a series of problems in the problems of later maintenance, power loss, electrical faults and the like. Other compressors need to be equipped with lubricating oil and matched pipelines and oil separators, so that the lubricating oil can influence the heat exchange efficiency of the two compressors, the energy efficiency is too low, meanwhile, the lubricating oil is too low or too high, adverse effects can be caused to the system, and the later-stage operation and maintenance cost is high.

Disclosure of Invention

Therefore, the invention provides an evaporative cooling type direct expansion unit and a control method thereof, which can overcome the defects of complex oil line pipeline and high operation and maintenance cost caused by the fact that the conventional water-cooling water chilling unit needs oil line lubrication in the prior art.

In order to solve the problems, the invention provides an evaporation cooling type direct expansion unit which comprises a compressor, a condenser, a throttling device and an evaporator, wherein the compressor, the condenser, the throttling device and the evaporator are sequentially connected to form a refrigerant refrigeration cycle, and the compressor is an air suspension compressor.

Preferably, the condenser is an evaporative condenser, and a spraying device is arranged at the condenser and can spray cooling water provided by the spraying device onto the condenser.

Preferably, the spraying device comprises a water pump, a spraying pipe at the top of the condenser and a water tank at the bottom of the condenser, and the water pump can pump cooling water in the water tank into the spraying pipe.

Preferably, the upper part of the spray pipe is provided with a water baffle.

Preferably, the condenser is externally provided with a filler.

Preferably, the evaporative cooling type direct expansion unit further comprises a housing, the housing is provided with an accommodating space, the accommodating space comprises a condenser mounting space and an evaporator mounting space which are mutually independent, the evaporator is mounted in the evaporator mounting space, and the compressor and the condenser are mounted in the condenser mounting space.

Preferably, a return air inlet and a fresh air inlet are formed in the shell corresponding to the two opposite sides of the evaporator installation space, an air supply fan is further arranged in the evaporator installation space, and the evaporator is located between the air supply fan and the return air inlet and between the evaporator and the fresh air inlet.

Preferably, the top of the condenser installation space is further provided with a condensing fan, and the condensing fan can drive cooling airflow to flow from bottom to top.

The invention also provides a control method of the evaporative cooling type direct expansion unit, which is used for controlling the evaporative cooling type direct expansion unit and comprises the following steps:

obtaining the supply air temperature T of the evaporator_{Feeding device}And the user sets the temperature T_{Is provided with}；

Comparison T_{Is provided with}And T_{Feeding device}The magnitude relationship of (1);

and controlling and adjusting the running frequency of the compressor and the running speed of the water pump according to the size relation.

Preferably, the first and second electrodes are formed of a metal,

when T is_{Feeding device}≤T_{Is provided with}When the water pump works, the running frequency of the compressor is controlled to be reduced, and the running speed of the water pump is controlled to be reduced; and/or the presence of a gas in the gas,

when T is_{Feeding device}＞T_{Is provided with}And controlling to increase the running frequency of the compressor and controlling to increase the running speed of the water pump.

Compared with the conventional water chilling unit in the prior art, on one hand, the evaporative cooling type direct expansion unit and the control method thereof adopt the air suspension compressor, and the corresponding cooling and lubricating oil way does not need to be designed aiming at the air suspension compressor, so that the system design of the unit is simpler, and the adverse effect caused by overhigh or overlow oil level in the system adopting the cooling and lubricating oil way is effectively avoided; on the other hand, the refrigerant direct expansion of the evaporator is adopted to realize space refrigeration without a conventional cold water main machine and a tail end type in the prior art, so that the heat exchange efficiency of a unit system can be improved, the unit structure is more compact, and the occupied area is smaller.

Drawings

Fig. 1 is a schematic structural diagram of an evaporation cooling type direct expansion unit according to an embodiment of the present invention (arrows in the drawing show the flowing direction of refrigerant);

fig. 2 is a schematic perspective view of an evaporative cooling type direct expansion unit according to an embodiment of the present invention;

fig. 3 is an exploded schematic view of the inner main components of fig. 2.

The reference numerals are represented as:

1. a compressor; 2. a condenser; 21. a condensing fan; 3. a throttling device; 4. an evaporator; 41. an air supply fan; 51. a shower pipe; 52. a water tank; 53. a water pump; 54. a water baffle; 55. a filler; 61. a housing; 611. an air return opening; 612. a fresh air port; 62. an electric cabinet.

Detailed Description

Referring to fig. 1 to 3 in combination, according to an embodiment of the present invention, an evaporation cooling type direct expansion unit is provided, including a compressor 1, a condenser 2, a throttling device 3, and an evaporator 4, where the compressor 1, the condenser 2, the throttling device 3, and the evaporator 4 are sequentially connected to form a refrigerant refrigeration cycle, and the compressor 1 is a gas suspension compressor. Compared with the conventional water chilling unit in the prior art, on one hand, the air suspension compressor is adopted, and a corresponding cooling and lubricating oil way does not need to be designed for the air suspension compressor, so that the system design of the water chilling unit is simpler, and the adverse effect caused by overhigh or overlow oil level in the system adopting the cooling and lubricating oil way is effectively avoided; on the other hand, the refrigerant direct expansion of the evaporator 4 is adopted to realize space refrigeration without a conventional cold water main machine and a tail end type in the prior art, so that the heat exchange efficiency of the unit system can be improved, the unit structure is more compact, and the occupied area is smaller.

The condenser 2 preferably adopts an evaporator condenser, which can adopt independent air cooling, and in order to further improve the heat exchange efficiency of the unit, a spraying device is arranged at the condenser 2, and the spraying device can spray cooling water contained in the spraying device onto the condenser 2, so that the heat exchange efficiency of the condenser 2 can be further improved by utilizing a water film formed by the cooling water, and the unit energy efficiency is further improved. Specifically, the spraying device comprises a water pump 53, a spraying pipe 51 positioned at the top of the condenser 2 and a water tank 52 positioned at the bottom of the condenser 2, wherein the spraying pipe 51 is a direct part for spraying the cooling water, the water tank 52 can collect the cooling water after heat exchange at the upper part, and the water pump 53 can pump the cooling water in the water tank 52 into the spraying pipe 51, so that the cooling water is recycled, and the unit is more environment-friendly.

Preferably, the condenser 2 is externally provided with a filler 55, the filler 55 is provided with a plurality of concave portions and convex portions so as to guide the cooling water and further increase the contact area between the cooling water and the outer surface of the condenser 2, which is beneficial to further increase the heat exchange efficiency of the condenser 2, and the filler 55 can be formed by stacking a plurality of pieces of plastic with concave portions and convex portions, for example.

In some embodiments, the evaporation cooling type direct expansion unit further comprises a housing 61, the housing 61 has a receiving space, the receiving space includes a condenser installation space and an evaporator installation space which are independent of each other, the evaporator 4 is installed in the evaporator installation space, the compressor 1 and the condenser 2 are installed in the condenser installation space, it can be understood that a corresponding condensation air duct is constructed in the condenser installation space, a corresponding air supply duct is constructed in the evaporator installation space, the evaporator 4 and the condenser 2 are respectively divided into two relatively independent spaces, and heat exchange air flows do not interfere with each other.

Preferably, a return air port 611 and a fresh air port 612 are formed in the shell 61 corresponding to the two opposite sides of the evaporator installation space, an air supply fan 41 is further arranged in the evaporator installation space, and the evaporator 4 is located between the air supply fan 41 and the return air port 611 and between the air supply fan 41 and the fresh air port 612, so that under the driving action of the air supply fan 41, external return air or fresh air enters the evaporator installation space through the return air port 611 and the fresh air port 612 respectively, is mixed with the evaporator 4 to form heat exchange, is cooled, and is then sent to the temperature adjustment space through an air outlet of the air supply fan 41.

It is best, condenser installation space's top still is equipped with condensation fan 21, condensation fan 21 can drive the cooling air flow from bottom to top flow, among this technical scheme, the cooling air flow that condensation fan 21 formed from bottom to top flow its with the cooling water that spray set formed from top to bottom flow opposite direction, and then form the heat transfer can further promote the heat exchange efficiency of condenser 2 against the current, in addition, the double cooling of forced air cooling and water-cooling also can further promote the heat exchange efficiency of condenser 2. At this time, it is preferable to provide a water guard 54 between the upper portion of the shower pipe 51 and the condensing fan 21 to prevent the cooling air flow from escaping to the outside of the unit together with the cooling water.

It will be appreciated that a corresponding electrical cabinet 62 is also provided within the assembly to enable electrical connections to be made to the various electrical components within the assembly.

According to an embodiment of the present invention, there is also provided a control method of an evaporation cooling type direct expansion unit, for controlling the evaporation cooling type direct expansion unit, including the steps of:

obtaining the supply air temperature T of the evaporator 4_{Feeding device}And the user sets the temperature T_{Is provided with}The air supply temperature can be indoor real-time environment temperature;

comparison T_{Is provided with}And T_{Feeding device}The magnitude relationship of (1);

and controlling and adjusting the running frequency of the compressor 1 and the running speed of the water pump 53 according to the size relation.

In the technical scheme, the refrigerating capacity of the unit can be more efficiently matched with the temperature adjustment requirement of a user by adjusting the operating frequency of the compressor 1 and the operating speed of the water pump 53.

Specifically, when T is_{Feeding device}≤T_{Is provided with}When the water pump is started, the running frequency of the compressor 1 is controlled to be reduced, and the running speed of the water pump 53 is controlled to be reduced; and/or, when T_{Feeding device}＞T_{Is provided with}At this time, the operation frequency of the compressor 1 is controlled to be increased, and the operation speed of the water pump 53 is controlled to be increased.

Further, when T is_{Feeding device}≤T_{Is provided with}When the compressor 1 is controlled to carry out unloading (namely, running down) operation according to the K1 proportion; after R1 seconds, controlling the water pump 53 to unload (namely, run at a reduced speed) according to the proportion of K2, and then controlling the condensing fan 21 to unload (namely, run at a reduced speed) according to the proportion of K3; and when the state lasts for R2 seconds, the compressor 1 is controlled to stop, and after R3 seconds, the water pump 53 and the fan 10 are controlled to stop, and at the moment, the evaporative cooling type direct expansion unit enters a standby mode.

When T is present_{Feeding device}＞T_{Is provided with}When the operation is performed, the water pump 53 is controlled to perform loading (namely, speed-up operation) operation according to the proportion of K2, and then the condensing fan 21 is controlled to perform loading (namely, speed-up operation) operation according to the proportion of K3; after R4 seconds, controlling the compressor 1 to start loading (namely, frequency-up running) according to the K1 proportion; when the compressor 1 is increased to the maximum frequency, the full-load refrigeration running mode of the evaporation cooling type direct expansion unit is entered.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.