Automated purge system for heat exchange coils in air conditioning units

Abstract

The utility model provides an automatic purge system for heat exchange coils of air conditioner units, which belongs to the technical field of air conditioner pipe antifreeze, including air conditioner units, air supply components and control components; a heat exchange coil is arranged inside the air conditioner unit; one end of the heat exchange coil is connected to a cold water supply component, and the other end is connected to a cold return water component; the bottom of the heat exchange coil is also connected to a water drain component; the air supply component has an air supply end, which is connected to the heat exchange coil; the control component is electrically connected to the cold water supply component, the cold return water component and the water drain component respectively; the control component is also electrically connected to the air supply component; when the outside temperature is low, the control component controls the cold water supply component and the cold return water component to close, and controls the water drain component to drain the water flow in the heat exchange coil; the control component also controls the air supply component to sweep hot air into the heat exchange coil. The automatic purge system for heat exchange coils of air conditioner units provided by the utility model can prevent the heat exchange coils from freezing and cracking, and effectively reduce the operation and maintenance costs.

Description

Technical Field

[0001] The utility model belongs to the technical field of air-conditioning pipe antifreezing, and more specifically, relates to an automatic purge system for a heat exchange coil of an air-conditioning unit. Background Art

[0002] The combined air conditioning unit is an important part of the purification air conditioning system. Its basic working principle is to send the air after heat and humidity treatment to the terminal air outlet of the air conditioning system through the fresh air primary and secondary efficiency filters, preheaters, surface coolers, reheaters, humidifiers and air supply units to offset the indoor heat and humidity load to meet the temperature, humidity and cleanliness requirements of the air-conditioned area. However, when the outside temperature is low, the heat exchange coil of the surface cooler of the combined air conditioning unit may freeze and crack when processing fresh air.

[0003] In the prior art, in the actual operation and maintenance process, it is often switched to hot water conditions in winter, so that hot water flows into the surface cooling coil to meet the air heating demand. In this way, the presence of cold water in the surface cooling coil in winter can be avoided, and the heat exchange coil of the surface cooler is drained after use; however, due to the complex structure of the heat exchange coil, the coil is not easy to drain, and water accumulates in the dead corners of the coil, which in turn causes ice and cracking problems in the accumulated water; alternatively, the heat exchange coil is filled with antifreeze, but the antifreeze is expensive, and irregular maintenance, rehydration and recovery control are required, resulting in increased initial investment and operating costs. Utility Model Content

[0004] The utility model aims to provide an automatic purge system for heat exchange coils of air conditioner units, aiming to solve the technical problems that heat exchange coils of existing surface coolers are prone to freezing and cracking, and the maintenance cost of using antifreeze is high.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: to provide an automatic purge system for the heat exchange coil of an air conditioning unit, comprising:

[0006] The air conditioning unit is provided with a heat exchange coil inside; one end of the heat exchange coil is connected to a cold water supply component, and the other end is connected to a cold water return component; the heat exchange coil is also connected to a water drain component;

[0007] An air supply component, having an air supply end, the air supply end being in communication with the heat exchange coil;

[0008] A control component, electrically connected to the cold water supply component, the cold water return component and the water discharge component respectively; the control component is also electrically connected to the air supply component;

[0009] Among them, when the outside temperature is low, the control component controls the cold water supply component and the cold return water component to close, and controls the water drain component to drain the water flow in the heat exchange coil; the control component is also used to control the air supply component to sweep hot air into the heat exchange coil.

[0010] In a possible implementation, the automatic purge system for the heat exchange coil of the air-conditioning unit further includes a temperature sensor for installation outdoors, and the temperature sensor is electrically connected to the control component.

[0011] In a possible implementation, the cold water supply assembly and the cold water return assembly are respectively connected to the upper end of the heat exchange coil; and the water drain assembly is connected to the bottom of the heat exchange coil.

[0012] In some embodiments, the cold water supply assembly includes:

[0013] A cold water supply pipeline, one end of which is connected to a cold water source and the other end of which is connected to the upper end of the heat exchange coil;

[0014] The first control valve is arranged on the cold water supply pipeline and is electrically connected to the control component.

[0015] In some embodiments, the cold water return component includes:

[0016] A cold water return pipeline, one end of which is connected to the upper end of the heat exchange coil and the other end of which is connected to the cold water recovery pipeline;

[0017] The second control valve is arranged on the cold water return pipeline and is electrically connected to the control component.

[0018] Exemplarily, the cold water return component further includes:

[0019] An exhaust pipeline, one end of which is connected to the cold water return pipeline and the other end of which extends vertically upward;

[0020] The air release valve is arranged on the exhaust pipeline.

[0021] In some embodiments, the drain assembly includes:

[0022] A drain pipe, one end of which is connected to the bottom of the heat exchange coil and the other end of which extends downward and leads out of the air conditioning unit;

[0023] The third control valve is arranged on the drain pipe and is electrically connected to the control assembly.

[0024] In a possible implementation, the air supply assembly includes:

[0025] Compressed air source;

[0026] an air supply pipeline, one end of which is connected to the compressed air source and the other end of which is the air supply end; and

[0027] The fourth control valve is arranged on the air supply pipeline and is electrically connected to the control component.

[0028] In some embodiments, the air supply end is connected to the cold water return component, and the air supply pipeline is connected to the heat exchange coil through the cold water return component.

[0029] In a possible implementation, the air-conditioning units are provided with a plurality of groups, each group of the air-conditioning units is provided with a corresponding group of the heat exchange coils, each group of the heat exchange coils is connected with a corresponding group of the cold water supply components, the cold return water components and the drain components, and the plurality of groups of the heat exchange coils are respectively connected with the air supply components.

[0030] Compared with the prior art, the solution shown in the embodiment of the present application first controls the cold water supply component and the cold return water component to be closed through the control component to close the cold water flow path; then, the cold water flow in the heat exchange coil is drained with the help of the drain component to prevent the cold water from accumulating in the heat exchange coil and freezing and cracking the heat exchange coil when the temperature is low; further, an air supply component is also provided in the present application, and the air supply component sweeps hot air into the heat exchange coil through the air supply end to dry the inside of the heat exchange coil, thereby finally achieving rapid draining and sufficient drying of the heat exchange coil, meeting the antifreeze technical requirements of the air-conditioning unit, and preventing the heat exchange coil from freezing and cracking under low temperature conditions; at the same time, there is no need to inject a large amount of antifreeze liquid, nor is there any need for maintenance, rehydration and recovery control, which can effectively control the antifreeze cost and reduce the operation and maintenance cost of the heat exchange coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic structural diagram of an automated purge system for a heat exchange coil of an air-conditioning unit provided in an embodiment of the utility model.

[0033] In the figure:

[0034] 1. Air conditioning unit; 11. Heat exchange coil; 2. Cold water supply assembly; 21. Cold water supply pipeline; 22. First control valve; 3. Cold return water assembly; 31. Cold return water pipeline; 32. Second control valve; 33. Exhaust pipeline; 34. Release valve; 4. Drain assembly; 41. Drain pipeline; 42. Third control valve; 5. Air supply assembly; 51. Compressed air source; 52. Air supply pipeline; 53. Fourth control valve; 6. Control assembly. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0038] Embodiment 1

[0039] The automatic purge system for the heat exchange coil of the air conditioner provided by the utility model is now described. Figure 1The automatic purge system for the heat exchange coil of the air-conditioning unit comprises an air-conditioning unit 1, an air supply component 5 and a control component 6; a heat exchange coil 11 is arranged inside the air-conditioning unit 1; one end of the heat exchange coil 11 is connected to a cold water supply component 2, and the other end is connected to a cold return water component 3; the bottom of the heat exchange coil 11 is also connected to a drain component 4; the air supply component 5 has an air supply end, which is connected to the heat exchange coil 11; the control component 6 is electrically connected to the cold water supply component 2, the cold return water component 3 and the drain component 4 respectively; the control component 6 is also electrically connected to the air supply component 5; wherein, when the outside temperature is low, the control component 6 controls the cold water supply component 2 and the cold return water component 3 to be closed, and controls the drain component 4 to drain the water flow in the heat exchange coil 11; the control component 6 is also used to control the air supply component 5 to sweep hot air into the heat exchange coil 11.

[0040] Specifically, the air-conditioning unit 1 is provided with a blower, a heating device and a surface cooler; the surface cooler includes the heat exchange coil 11; in the present application, the cold water flow in the heat exchange coil 11 is drained and the hot air is purged mainly with the help of the water drain component 4, the air supply component 5 and the control component 6, so as to avoid the heat exchange coil 11 of the surface cooler from freezing and cracking when the temperature is low.

[0041] It should be noted that the control component 6 used in the present application is mainly a control module based on PLC, and the control module is a structure controlled by multiple control elements integrated together. The compressed air is introduced into the heat exchange coil 11, and the drain component 4 controls the drain action of the heat exchange coil 11, which are all realized through various control elements respectively. The specific structure and working principle of each control element, as well as the integration principle of the control module, belong to the existing technology and will not be repeated here.

[0042] Compared with the prior art, the automatic purge system for the heat exchange coil of the air-conditioning unit provided by the utility model first controls the cold water supply component 2 and the cold return water component 3 to be closed through the control component 6 to close the cold water flow path; then uses the drain component 4 to drain the cold water flow in the heat exchange coil 11 to prevent the cold water from accumulating in the heat exchange coil 11 and freezing and cracking the heat exchange coil 11 when the temperature is low; further, an air supply component 5 is also provided in the present application, and the air supply component 5 sweeps hot air into the heat exchange coil 11 through the air supply end to dry the inside of the heat exchange coil 11, and finally realizes the rapid draining and sufficient drying of the heat exchange coil 11, meets the antifreeze technical requirements of the air-conditioning unit 1, and prevents the heat exchange coil 11 from freezing and cracking under low temperature conditions; at the same time, there is no need to inject a large amount of antifreeze liquid, and there is no need to perform maintenance, replenishment and recovery control, which can effectively control the antifreeze cost and reduce the operation and maintenance cost of the heat exchange coil 11.

[0043] See also Figure 1 In some possible embodiments, the automatic purge system for the heat exchange coil of the air-conditioning unit further includes a temperature sensor for installation outdoors, and the temperature sensor is electrically connected to the control component 6.

[0044] A temperature sensor is provided to timely monitor the outside temperature so as to determine the critical temperature value. When the outside temperature is lower than the preset temperature, the control component 6 is used to timely control the cold water in the heat exchange coil 11 to drain and execute the hot air purge command to prevent the heat exchange coil 11 from freezing and cracking.

[0045] Specifically, the monitoring principle and specific structure of the temperature sensor belong to the prior art and will not be described in detail here.

[0046] See also Figure 1 In some possible embodiments, the cold water supply assembly 2 and the cold water return assembly 3 are respectively connected to the upper end of the heat exchange coil 11; the drain assembly 4 is connected to the bottom of the heat exchange coil 11.

[0047] It should be understood that the heat exchange coil 11 is a spiral structure extending up and down; by arranging the cold water supply component 2 and the cold return water component 3 at the upper end, it is convenient for the cold supply water to flow along the heat exchange coil 11 under the action of gravity, and to be discharged through the cold return water component 3 at the upper end with the help of water pressure, thereby realizing the circulating supply of cold water flow.

[0048] By arranging the drain assembly 4 at the bottom of the heat exchange coil 11, when the cold water supply assembly 2 and the cold return water assembly 3 are closed, the cold water flow in the heat exchange coil 11 is discharged from the heat exchange coil 11 under the action of gravity, which is beneficial to promote the emptying of the heat exchange coil 11.

[0049] See also Figure 1 In some embodiments, the cold water supply component 2 includes a cold water supply pipeline 21 and a first control valve 22; one end of the cold water supply pipeline 21 is used to connect with the cold water source, and the other end is connected with the upper end of the heat exchange coil 11; the first control valve 22 is arranged on the cold water supply pipeline 21 and is electrically connected to the control component 6.

[0050] The cold water supply pipeline 21 is used to introduce cold water flow into the heat exchange coil 11, and the first control valve 22 is used to control the on-off of the cold water supply pipeline 21; specifically, the control component 6 controls the opening and closing action of the first control valve 22 to realize the on-off of the cold water flow in the cold water supply pipeline 21.

[0051] See also Figure 1 In some embodiments, the cold return water assembly 3 includes a cold return water pipeline 31 and a second control valve 32; one end of the cold return water pipeline 31 is connected to the upper end of the heat exchange coil 11, and the other end is used to connect to the cold water recovery pipeline; the second control valve 32 is arranged on the cold return water pipeline 31 and is electrically connected to the control assembly 6.

[0052] The cold return water pipeline 31 is used to guide the cold water flow in the heat exchange coil 11 out and circulate it to the cold water recovery pipeline for next use. The second control valve 32 is used to control the on-off of the cold return water pipeline 31; specifically, the control component 6 controls the opening and closing of the second control valve 32 to realize the on-off of the cold water flow in the cold return water pipeline 31.

[0053] See also Figure 1 Exemplarily, the cold return water assembly 3 also includes an exhaust pipe 33 and an air release valve 34; one end of the exhaust pipe 33 is connected to the cold return water pipe 31, and the other end extends vertically upward; the air release valve 34 is arranged on the exhaust pipe 33.

[0054] The exhaust pipeline 33 is used to discharge air from the heat exchange coil 11 . Specifically, the control component 6 controls the opening and closing of the exhaust pipeline 33 by controlling the opening and closing of the air discharge valve 34 .

[0055] It should be understood that after the heat exchange coil 11 is purged with hot air, some dried hot air will remain in the heat exchange coil 11 , and at this time, the excess hot air in the heat exchange coil 11 can also be discharged through the vent valve 34 .

[0056] See also Figure 1 In some embodiments, the drain assembly 4 includes a drain pipe 41 and a third control valve 42; one end of the drain pipe 41 is connected to the bottom of the heat exchange coil 11, and the other end extends downward and leads out of the air-conditioning unit 1; the third control valve 42 is arranged on the drain pipe 41 and is electrically connected to the control assembly 6.

[0057] The drain pipe 41 is used to guide the cold water flow in the heat exchange coil 11 out to drain the heat exchange coil 11, so as to avoid the risk of water accumulation in the heat exchange coil 11 and causing freezing and cracking. The third control valve 42 is used to control the on-off of the drain pipe 41; specifically, the control component 6 controls the opening and closing of the cold water flow in the drain pipe 41 by controlling the opening and closing of the third control valve 42.

[0058] It should be noted that after the water discharge action is completed, the third control valve 42 needs to be closed in time to prevent foreign matter from entering the heat exchange coil 11 .

[0059] See also Figure 1 In some possible embodiments, the air supply component 5 includes a compressed air source 51, an air supply pipeline 52 and a fourth control valve 53; one end of the air supply pipeline 52 is connected to the compressed air source 51, and the other end is the air supply end; the fourth control valve 53 is arranged on the air supply pipeline 52 and is electrically connected to the control component 6.

[0060] The compressed air source 51 is used to provide hot air for drying, the air supply pipeline 52 is used to sweep hot air into the heat exchange coil 11 to dry the inside of the heat exchange coil 11 to prevent the heat exchange coil 11 from freezing and cracking, and the fourth control valve 53 is used to control the on-off of the air supply pipeline 52; specifically, the control component 6 realizes the on-off of the compressed hot air in the air supply pipeline 52 by controlling the opening and closing action of the fourth control valve 53.

[0061] See also Figure 1 As a specific implementation of the above-mentioned air supply component 5 being connected to the heat exchange coil 11, the air supply end is connected to the cold return water component 3, and the air supply pipeline 52 is connected to the heat exchange coil 11 through the cold return water component 3.

[0062] Specifically, the compressed air source 51 passes hot air into the cold return water pipeline 31 of the cold return water assembly 3 through the air supply pipeline 52 , so that the hot air is passed into the heat exchange coil 11 via the cold return water pipeline 31 .

[0063] In specific implementation, the outdoor fresh air temperature can be dynamically monitored by a temperature sensor, and the fresh air temperature can be dynamically uploaded to the control component 6. When the control component 6 receives that the fresh air temperature value is lower than 15°C, the first control valve 22 and the second control valve 32 are controlled to be closed, and after a delay of the first preset time period, the third control valve 42 is controlled to be opened to realize the water discharge action of the heat exchange coil 11, and the water discharge time lasts for the second preset time period; preferably, the first preset time is selected as 10 seconds, and the second preset time period can be set according to the actual capacity of the heat exchange coil 11. When the preset water discharge time is reached, the control component 6 controls the fourth control valve 53 to open to sweep the hot air flow into the heat exchange coil 11, and lasts for the third preset time period. During this process, the first control valve 22 and the second control valve 32 need to be maintained in the closed state; after the hot air purge duration is completed, the control component 6 controls the fourth control valve 53 to close again to prevent foreign matter from entering the heat exchange coil 11 of the surface cooler.

[0064] Embodiment 2

[0065] In some possible embodiments, multiple groups of air-conditioning units 1 are provided, each group of air-conditioning units 1 is correspondingly provided with a group of heat exchange coils 11, each group of heat exchange coils 11 is correspondingly connected to a group of cold water supply components 2, cold return water components 3 and drain components 4, and multiple groups of heat exchange coils 11 are respectively connected to the air supply components 5.

[0066] It should be understood that each group of heat exchange coils 11 corresponds to a group of cold water supply components 2, cold return water components 3 and drain components 4, which are used to control the cold water flow interruption in each group of heat exchange coils 11 and the draining process of each heat exchange coil 11 respectively; and the air supply component 5 is connected to the multiple groups of heat exchange coils 11 respectively, and is used to simultaneously introduce hot air into the multiple groups of heat exchange coils 11, so as to achieve simultaneous drying of the multiple groups of heat exchange coils 11 and improve the efficiency of the drying operation.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic purge system for heat exchange coils of air conditioning units, characterized in that: include: An air conditioning unit (1) is provided with a heat exchange coil (11) inside; one end of the heat exchange coil (11) is connected to a cold water supply component (2), and the other end is connected to a cold water return component (3); the heat exchange coil (11) is also connected to a water drain component (4); An air supply component (5) having an air supply end, the air supply end being in communication with the heat exchange coil (11); and A control component (6) is electrically connected to the cold water supply component (2), the cold water return component (3) and the water discharge component (4) respectively; the control component (6) is also electrically connected to the air supply component (5); Wherein, when the outside temperature is low, the control component (6) controls the cold water supply component (2) and the cold water return component (3) to be closed, and controls the water drain component (4) to drain the water flow in the heat exchange coil (11); the control component (6) is also used to control the air supply component (5) to sweep hot air into the heat exchange coil (11).

2. The automatic purge system for heat exchange coils of air conditioner units according to claim 1, characterized in that: The automatic purge system for the heat exchange coil of the air-conditioning unit also includes a temperature sensor for installation outdoors, and the temperature sensor is electrically connected to the control component (6).

3. The automatic purge system for heat exchange coils of air conditioner units according to claim 1, characterized in that: The cold water supply assembly (2) and the cold water return assembly (3) are respectively connected to the upper end of the heat exchange coil (11); and the water drain assembly (4) is connected to the bottom of the heat exchange coil (11).

4. The automatic purge system for heat exchange coils of air conditioner units according to claim 3, characterized in that: The cold water supply component (2) comprises: A cold water supply pipeline (21), one end of which is used to communicate with a cold water source, and the other end of which is connected to the upper end of the heat exchange coil (11); The first control valve (22) is arranged on the cold water supply pipeline (21) and is electrically connected to the control component (6).

5. The automatic purge system for heat exchange coils of air conditioner units according to claim 3, characterized in that: The cold water return component (3) comprises: A cold water return pipeline (31), one end of which is connected to the upper end of the heat exchange coil (11), and the other end of which is used to be connected to the cold water recovery pipeline; The second control valve (32) is arranged on the cold water return pipeline (31) and is electrically connected to the control component (6).

6. The automatic purge system for heat exchange coils of air conditioner units according to claim 5, characterized in that: The cold water return component (3) further comprises: An exhaust pipe (33), one end of which is connected to the cold water return pipe (31) and the other end of which extends vertically upward; The air release valve (34) is arranged on the exhaust pipeline (33).

7. The automatic purge system for heat exchange coils of air conditioner units according to claim 3, characterized in that: The water discharge assembly (4) comprises: A drain pipe (41), one end of which is in communication with the bottom of the heat exchange coil (11), and the other end of which extends downward and is led out of the air conditioning unit (1); The third control valve (42) is arranged on the drain pipe (41) and is electrically connected to the control assembly (6).

8. The automatic purge system for heat exchange coils of air conditioner units according to claim 1, characterized in that: The air supply assembly (5) comprises: A compressed air source (51); an air supply pipeline (52), one end of which is connected to the compressed air source (51) and the other end of which is the air supply end; and The fourth control valve (53) is arranged on the gas supply pipeline (52) and is electrically connected to the control component (6).

9. The automatic purge system for heat exchange coils of air conditioner units according to claim 8, characterized in that: The air supply end is in communication with the cold return water component (3), and the air supply pipeline (52) is in communication with the heat exchange coil (11) through the cold return water component (3).

10. The automatic purge system for heat exchange coils of air conditioner units according to claim 1, characterized in that: The air conditioning units (1) are provided with a plurality of groups, each group of the air conditioning units (1) is provided with a corresponding group of the heat exchange coils (11), each group of the heat exchange coils (11) is connected with a corresponding group of the cold water supply components (2), the cold water return components (3) and the water drain components (4), and the plurality of groups of the heat exchange coils (11) are respectively connected with the air supply components (5).

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