Backboard air conditioner capable of preventing water blowing and control method thereof

Abstract

The invention relates to the technical field of air conditioners, in particular to an anti-water-blowing backboard air conditioner and a control method thereof.The anti-water-blowing backboard air conditioner comprises an air inlet side, an air outlet side, a first heat exchanger and a second heat exchanger; the second heat exchanger is arranged between the air outlet side and the first heat exchanger; the backboard air conditioner capable of preventing water blowing further comprises a first water inlet pipe, a first water outlet pipe and a second water outlet pipe. The first water inlet pipe communicates with the side, close to the air outlet side, of the coil pipe. The first water outlet pipe communicates with the side, close to the air inlet side, of the coil pipe and one end of the second heat exchanger. The second water outlet pipe communicates with the other end of the second heat exchanger; a fan is arranged on the air outlet side; an electric control valve is arranged on the first water inlet pipe and / or the second water outlet pipe. By arranging the first heat exchanger and the second heat exchanger, the second heat exchanger can directly intercept condensation generated by the first heat exchanger, and air flow is prevented from carrying water; in addition, four-stage rotating speed adjustment is conducted on the draught fan, and the electric control valve is accurately controlled, so that the risk that condensation is blown away is reduced logically from operation.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, specifically to a back-panel air conditioner that prevents water from blowing in and its control method. Background Technology

[0002] With the rapid iteration of information technology, the computing density in data centers, communication equipment rooms, and other scenarios continues to increase. The load power of core equipment such as servers and switches within communication cabinets is constantly increasing, leading to a sharp rise in heat generated during operation. This places higher demands on the cooling capacity and efficiency of cabinet cooling systems. Among various cabinet cooling devices, back-panel chilled water air conditioners are widely used in data center cabinet cooling scenarios due to their significant advantages, including space-saving design, high energy efficiency, and easy installation.

[0003] However, to accommodate the installation space of the cabinet and the requirements of modular design, the back panel type chilled water air conditioner has a "tall, narrow, and thin" structural feature. Although this structural design meets the requirements of space adaptability, it makes it easy for condensate to be blown out of the coil by the airflow (i.e., the "water blowing" phenomenon). Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a water-proof back panel air conditioner and its control method.

[0005] The objective of this invention is achieved through the following technical solution: a back panel air conditioner with anti-water blowing, comprising an air inlet side, an air outlet side, a first heat exchanger, and a second heat exchanger; the second heat exchanger is disposed between the air outlet side and the first heat exchanger; a coil is provided inside the first heat exchanger; the air flow direction in the horizontal direction between the air inlet side and the air outlet side is opposite to the liquid flow direction in the horizontal direction inside the coil. The back panel air conditioner with anti-blowing function also includes a first water inlet pipe, a first water outlet pipe, and a second water outlet pipe; the first water inlet pipe is connected to the side of the coil near the air outlet; the first water outlet pipe is connected to the side of the coil near the air inlet and one end of the second heat exchanger; the second water outlet pipe is connected to the other end of the second heat exchanger. A fan is provided on the air outlet side; an electrically controlled valve is provided on the first water inlet pipe and / or the second water outlet pipe.

[0006] The present invention is further configured such that the second heat exchanger is spaced apart from the first heat exchanger; The second heat exchanger is arranged in parallel with the first heat exchanger.

[0007] The present invention is further configured such that the first water inlet pipe is connected to the top of the coil near the air outlet side; the first water outlet pipe is connected to the bottom of the coil near the air inlet side; the second water outlet pipe is connected to the top of the second heat exchanger; and the first water outlet pipe is connected to the bottom of the second heat exchanger.

[0008] The present invention is further configured such that the back panel air conditioner for preventing water blowing also includes a water collection tray; both the first heat exchanger and the second heat exchanger are disposed on the water collection tray.

[0009] The present invention is further configured such that: the first water inlet pipe is provided with a first water inlet temperature sensor; the first water outlet pipe is provided with a second water inlet temperature sensor; and the second water outlet pipe is provided with an water outlet temperature sensor. The air inlet side is equipped with a first temperature and humidity sensor; a second temperature and humidity sensor is provided between the first heat exchanger and the second heat exchanger; and a third temperature and humidity sensor is provided on the air outlet side.

[0010] A method for controlling a water-resistant back panel air conditioner includes the following steps: Step S1: Detect the inlet water temperature and the inlet air dew point temperature of the first heat exchanger. If the inlet water temperature of the first heat exchanger is greater than the inlet air dew point temperature of the first heat exchanger, proceed to step A1; if the inlet water temperature of the first heat exchanger is not greater than the inlet air dew point temperature of the first heat exchanger, proceed to step S2. Step A1: The rated speed of the fan is switched to the first preset speed value; the real-time speed of the fan is adjusted according to the first preset speed value and the system PI control requirements. Step S2: Detect the inlet water temperature, the inlet dew point temperature, and the inlet dry bulb temperature of the second heat exchanger; if the inlet water temperature of the second heat exchanger is greater than the inlet dry bulb temperature, proceed to step A2; otherwise, proceed to step S3. Step A2: The rated speed of the fan is switched to the second preset speed value; the real-time speed of the fan is adjusted according to the second preset speed value and the system PI control requirements. Step S3: If the inlet water temperature of the second heat exchanger is not greater than the inlet dry-bulb temperature of the second heat exchanger and the inlet water temperature of the second heat exchanger is greater than the inlet dew point temperature of the second heat exchanger, proceed to step A3; otherwise, proceed to step S4. Step A3: The rated speed of the fan is switched to the third preset speed value; the real-time speed of the fan is adjusted according to the third preset speed value and the system PI control requirements. Step S4: If the inlet water temperature of the second heat exchanger is not greater than the inlet dew point temperature of the second heat exchanger, proceed to step A4. Step A4: The rated speed of the fan is switched to the fourth preset speed value; the real-time speed of the fan is adjusted according to the fourth preset speed value and the system PI control requirements. The first preset speed value is greater than the second preset speed value; the second preset speed value is greater than the third preset speed value; the third preset speed value is greater than the fourth preset speed value.

[0011] The present invention is further configured such that, in step A1, the opening degree of the electrically controlled valve is adjusted according to the system PI control requirements.

[0012] The present invention is further configured such that, in step A2, the opening degree of the electrically controlled valve is adjusted according to the system PI control requirements.

[0013] The present invention is further configured such that, in step A3, the opening degree of the electrically controlled valve is adjusted according to the system PI control requirements, and the opening degree is not increased when a positive deviation is accumulated.

[0014] The present invention is further configured such that, in step A4, the opening degree of the electrically controlled valve gradually decreases periodically.

[0015] The beneficial effects of the present invention are as follows: By setting up a first heat exchanger and a second heat exchanger, the second heat exchanger can directly intercept the condensation generated by the first heat exchanger, thus avoiding water being carried away by the airflow; in addition, by adjusting the speed of the fan in four stages and by precisely controlling the electronically controlled valve, the risk of condensation being carried away by the airflow is reduced from the perspective of the operating logic. Attached Figure Description

[0016] The invention will be further illustrated with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the invention. For those skilled in the art, other drawings can be obtained based on the following drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a flowchart of the method of the present invention; The components are: 1. Air inlet side; 2. Air outlet side; 3. First heat exchanger; 31. Coil; 41. First water inlet pipe; 42. First water outlet pipe; 5. Second heat exchanger; 6. Second water outlet pipe; 61. Electrically controlled valve; 7. Fan; 8. Water receiving tray; 91. First water inlet temperature sensor; 92. Second water inlet temperature sensor; 93. Water outlet temperature sensor; 94. First temperature and humidity sensor; 95. Second temperature and humidity sensor; 96. Third temperature and humidity sensor. Detailed Implementation

[0018] The present invention will be further described in conjunction with the following embodiments.

[0019] Depend on Figure 1 As can be seen, the back panel air conditioner with anti-water blowing described in this embodiment includes an air inlet side 1, an air outlet side 2, a first heat exchanger 3, and a second heat exchanger 5; the second heat exchanger 5 is disposed between the air outlet side 2 and the first heat exchanger 3; the first heat exchanger 3 is provided with a coil 31; the air flow direction in the horizontal direction between the air inlet side 1 and the air outlet side 2 is opposite to the liquid flow direction in the horizontal direction in the coil 31. The back panel air conditioner with anti-blowing function also includes a first water inlet pipe 41, a first water outlet pipe 42, and a second water outlet pipe 6; the first water inlet pipe 41 is connected to the side of the coil 31 near the air outlet side 2; the first water outlet pipe 42 is connected to the side of the coil 31 near the air inlet side 1 and one end of the second heat exchanger 5; the second water outlet pipe 6 is connected to the other end of the second heat exchanger 5. The air outlet side 2 is equipped with a fan 7; the first water inlet pipe 41 and / or the second water outlet pipe 6 are equipped with an electrically controlled valve 61.

[0020] Specifically, the anti-water-blowing back panel air conditioner described in this embodiment sets the horizontal flow direction of the air between the air inlet side 1 and the air outlet side 2 to be opposite to the horizontal flow direction of the liquid in the coil 31. This allows the air entering from the air inlet side 1 to first contact the relatively warm liquid in the coil 31, thereby reducing the temperature difference between the air on the air inlet side 1 and the liquid on the side of the coil 31 near the air outlet side 2, and reducing the risk of condensation on the pipes on the side of the coil 31 near the air outlet side 2. In addition, the second heat exchanger 5 is connected to the first water outlet pipe 42 and is located between the fan 7 and the first heat exchanger 3, utilizing the relatively warm water outlet pipe 42 that has already undergone one heat exchange. The liquid undergoes secondary heat exchange with the air that has been initially cooled by the first heat exchanger 3. On the one hand, the secondary heat exchange can further stabilize the outlet air temperature and prevent condensation caused by a sudden drop in air temperature on the outlet side 2. On the other hand, it can recover the remaining cold energy in the liquid in the first outlet pipe 42, improving the overall energy utilization rate. At the same time, because the liquid temperature in the second heat exchanger 5 is higher than the initial inlet water temperature, the temperature difference between its wall and the air is smaller, further reducing the possibility of condensation. Furthermore, by setting up the second heat exchanger 5, even if condensation occurs in the first heat exchanger 3, the second heat exchanger 5 can block the condensation under the drive of the airflow, preventing the airflow from carrying the condensation out of the back panel air conditioner and preventing water blowing.

[0021] In this embodiment, a back panel air conditioner designed to prevent water blowing is provided, wherein the second heat exchanger 5 and the first heat exchanger 3 are spaced apart. Specifically, this embodiment ensures that there is sufficient distance between the second heat exchanger 5 and the first heat exchanger 3, so that even if condensation occurs on the first heat exchanger 3, the condensation will remain in the distance between the second heat exchanger 5 and the first heat exchanger 3 under the influence of airflow, preventing the airflow from carrying the condensation out of the back panel air conditioner and preventing water blowing.

[0022] The second heat exchanger 5 is arranged parallel to the first heat exchanger 3. Specifically, in this embodiment, through the above arrangement, even if condensation occurs on the first heat exchanger 3, the second heat exchanger 5 can block the condensation under the drive of the airflow, preventing the airflow from carrying the condensation out of the back panel air conditioner and preventing water blowing.

[0023] This embodiment describes a back-panel air conditioner designed to prevent water from blowing out of the coil. The first water inlet pipe 41 is connected to the top of the coil 31 near the air outlet side 2; the first water outlet pipe 42 is connected to the bottom of the coil 31 near the air inlet side 1; the second water outlet pipe 6 is connected to the top of the second heat exchanger 5; and the first water outlet pipe 42 is connected to the bottom of the second heat exchanger 5. By connecting the first water inlet pipe 41 to the top of the coil 31 near the air outlet side 2 and the first water outlet pipe 42 to the bottom of the coil 31 near the air inlet side 1, this embodiment ensures that the liquid fully fills the coil 31 from top to bottom, preventing empty pipes or liquid stagnation in certain areas and ensuring uniform heat exchange throughout the coil 31. Furthermore, the second water outlet pipe 6 connecting to the top of the second heat exchanger 5 and the first water outlet pipe 42 connecting to the bottom of the second heat exchanger 5 allow the liquid to flow from bottom to top within the second heat exchanger 5, fully filling the coil 31 and preventing heat exchange dead zones caused by localized liquid shortages.

[0024] The back panel air conditioner with anti-dampening technology described in this embodiment further includes a water collection tray 8; both the first heat exchanger 3 and the second heat exchanger 5 are disposed on the water collection tray 8. This arrangement facilitates the collection of condensate generated by the first heat exchanger 3 and the second heat exchanger 5.

[0025] The back panel air conditioner with anti-blowing feature described in this embodiment has a first inlet water temperature sensor 91 on the first inlet water pipe 41; a second inlet water temperature sensor 92 on the first outlet water pipe 42; and an outlet water temperature sensor 93 on the second outlet water pipe 6. The first inlet water temperature sensor 91 facilitates the acquisition of the inlet water temperature of the first heat exchanger 3, the second inlet water temperature sensor 92 facilitates the acquisition of the inlet water temperature of the second heat exchanger 5, and the outlet water temperature sensor 93 facilitates the acquisition of the outlet water temperature of the second heat exchanger 5.

[0026] The air inlet side 1 is equipped with a first temperature and humidity sensor 94; a second temperature and humidity sensor 95 is provided between the first heat exchanger 3 and the second heat exchanger 5; and a third temperature and humidity sensor 96 is provided on the air outlet side 2. By setting the first temperature and humidity sensor 94, it is convenient to collect the temperature and humidity at the air inlet of the first heat exchanger 3, thereby enabling the calculation of the air inlet dew point temperature of the first heat exchanger 3. By setting the second temperature and humidity sensor 95, it is convenient to collect the temperature and humidity at the air inlet of the second heat exchanger 5, thereby enabling the calculation of the air inlet dry bulb temperature and the air inlet dew point temperature of the second heat exchanger 5.

[0027] Depend on Figure 2 As can be seen, the control method for a water-proof back panel air conditioner described in this embodiment includes the following steps: Step S1: Detect the inlet water temperature and the inlet air dew point temperature of the first heat exchanger 3. If the inlet water temperature of the first heat exchanger 3 is greater than the inlet air dew point temperature of the first heat exchanger 3, proceed to step A1; if the inlet water temperature of the first heat exchanger 3 is not greater than the inlet air dew point temperature of the first heat exchanger 3, proceed to step S2. Step A1: The rated speed of the fan 7 is switched to the first preset speed value; the real-time speed of the fan 7 is adjusted according to the first preset speed value and the system PI control requirements; when the inlet water temperature of the first heat exchanger 3 is greater than the inlet dew point temperature of the first heat exchanger 3, the wall temperature of the first heat exchanger 3 is higher than the air dew point, no condensation is generated, and neither the first heat exchanger 3 nor the second heat exchanger 5 is in dehumidification state. At this time, there is no need to reduce the speed to prevent water blowing. Therefore, in step A1, the rated speed of the fan 7 is switched to the highest first preset speed value, which ensures the maximum air volume to improve the heat exchange efficiency between the air and the coil 31 and meet the heat dissipation requirements of the high heat density cabinet. Step S2: Detect the inlet water temperature, the inlet air dew point temperature, and the inlet air dry bulb temperature of the second heat exchanger 5; if the inlet water temperature of the second heat exchanger 5 is greater than the inlet air dry bulb temperature of the second heat exchanger 5, proceed to step A2; otherwise, proceed to step S3. Step A2: The rated speed of the fan 7 is switched to the second preset speed value; the real-time speed of the fan 7 is adjusted according to the system PI control requirements based on the second preset speed value; when the inlet water temperature of the first heat exchanger 3 is ≤ the inlet dew point temperature of the first heat exchanger 3, the first heat exchanger 3 already has a risk of condensation, and it is necessary to further judge the condensation and heat exchange status of the second heat exchanger 5; when the inlet water temperature of the second heat exchanger 5 is > the inlet dry bulb temperature of the second heat exchanger 5, the wall temperature of the second heat exchanger 5 is higher than the dry bulb temperature of the air, not only is there no risk of condensation, but it can also reheat the air that has been initially cooled by the first heat exchanger 3, avoiding additional condensation on the outlet side 2 caused by a sudden drop in air temperature. At this time, the first heat exchanger 3 is in a dehumidification state, and the second heat exchanger 5 is in a reheating state; therefore, step A2 switches the rated speed of the fan 7 to the second preset speed value, which is lower than the first speed, while maintaining effective heat exchange, and reduces the carrying capacity of the airflow on the condensation that may be generated in the first heat exchanger 3 by appropriately reducing the speed. Step S3: If the inlet water temperature of the second heat exchanger 5 is not greater than the inlet dry bulb temperature of the second heat exchanger 5 and the inlet water temperature of the second heat exchanger 5 is greater than the inlet dew point temperature of the second heat exchanger 5, proceed to step A3; otherwise, proceed to step S4. Step A3: The rated speed of the fan 7 is switched to the third preset speed value; the real-time speed of the fan 7 is adjusted according to the system PI control requirements based on the third preset speed value; when the inlet water temperature of the first heat exchanger 3 is ≤ the inlet dew point temperature of the first heat exchanger 3, the first heat exchanger 3 already has a risk of condensation, and it is necessary to further judge the condensation and heat exchange status of the second heat exchanger 5; when the inlet dry bulb temperature of the second heat exchanger 5 is ≥ the inlet water temperature of the second heat exchanger 5 > the inlet dew point temperature of the second heat exchanger 5, the wall temperature of the second heat exchanger 5 is between the air dew point and the dry bulb temperature. Although there is no obvious condensation, there is a risk of condensation, and the risk of water carried by the airflow is higher than in the scenario of step A2. At this time, the first heat exchanger 3 is in dehumidification mode, and the second heat exchanger 5 is in cooling mode; therefore, step A3 switches the rated speed of the fan 7 to the third preset speed value, which is lower than the second speed, to further reduce the airflow speed and reduce the probability of airflow carrying away condensation from the first heat exchanger 3 from the source. Step S4: If the inlet water temperature of the second heat exchanger 5 is not greater than the inlet dew point temperature of the second heat exchanger 5, proceed to step A4. Step A4: The rated speed of the fan 7 is switched to the fourth preset speed value; the real-time speed of the fan 7 is adjusted according to the fourth preset speed value and the system PI control requirements; when the inlet water temperature of the first heat exchanger 3 is less than or equal to the inlet dew point temperature of the first heat exchanger 3, the first heat exchanger 3 is at risk of condensation, and it is necessary to further judge the condensation and heat exchange status of the second heat exchanger 5; when the inlet water temperature of the second heat exchanger 5 is less than or equal to the inlet dew point temperature of the second heat exchanger 5, the wall temperature of the second heat exchanger 5 is lower than the air dew point, both the first heat exchanger 3 and the second heat exchanger 5 are at condensation, and the risk of water carrying by the airflow reaches its highest level. At this time, both the first heat exchanger 3 and the second heat exchanger 5 are in dehumidification state; therefore, step A4 switches the rated speed of the fan 7 to the lowest fourth preset speed value to minimize the airflow speed, so as to minimize the carrying capacity of the airflow for condensation and prevent the condensation from being blown out of the air conditioner; The first preset speed value is greater than the second preset speed value; the second preset speed value is greater than the third preset speed value; the third preset speed value is greater than the fourth preset speed value.

[0028] Specifically, the first heat exchanger 3 is responsible for achieving the main goals of cooling and dehumidification, and therefore is thicker than the second heat exchanger 5. The second heat exchanger 5 is responsible for supplementing cooling or reheating the outlet air, and can also block the water blowing from the side of the first heat exchanger 3 that is prone to condensation.

[0029] Because the horizontal flow direction of the air between the air inlet side 1 and the air outlet side 2 is opposite to the horizontal flow direction of the liquid in the coil 31, the outlet air temperature of the first heat exchanger 3 may be lower or higher than the outlet water temperature during counter-current heat exchange. For example, if the inlet / outlet water temperature in the first heat exchanger 3 is 18℃ / 23℃ and the inlet / outlet air temperature is 35℃ / 27℃, then the inlet water temperature of the second heat exchanger 5 will be 23℃ and the inlet air temperature will be 27℃. In this case, the second heat exchanger 5 can further cool the outlet air of the first heat exchanger 3. Alternatively, if the inlet / outlet water temperature of the first heat exchanger 3 is 18℃ / 25℃ and the inlet / outlet air temperature is 35℃ / 23℃, then the inlet water temperature of the second heat exchanger 5 will be 25℃ and the inlet air temperature will be 23℃. In this case, the second heat exchanger 5 will then reheat the outlet air of the first heat exchanger 3.

[0030] In the control method of the anti-water-blowing back panel air conditioner described in this embodiment, in step A1, the opening degree of the electronically controlled valve 61 is adjusted according to the system PI control requirements. Specifically, by adjusting the opening degree of the electronically controlled valve 61 according to the system PI control requirements, the water flow can be precisely matched according to the actual cooling load, avoiding energy waste caused by excessive water flow or insufficient cooling capacity caused by insufficient water flow, thus achieving the dual effects of efficient heat exchange and precise load control.

[0031] In the control method of the anti-dampening back panel air conditioner described in this embodiment, in step A2, the opening degree of the electrically controlled valve 61 is adjusted according to the system PI control requirements. The electrically controlled valve 61 is still adjusted according to the system PI control to ensure a stable cooling supply, and works with the fan 7 to achieve a balance between anti-dampening pretreatment and cooling capacity guarantee.

[0032] In the control method of the back panel air conditioner for preventing water blow-through described in this embodiment, in step A3, the opening degree of the electronically controlled valve 61 is adjusted according to the system PI control requirements, and the opening degree is not increased when there is a cumulative positive deviation. Specifically, when the electronically controlled valve 61 adjusts its opening degree according to the system PI control, a restriction is added that the opening degree will not be increased when there is a cumulative positive deviation. When the system feedback indicates that the cooling capacity has met the requirements (a negative deviation occurs), the water flow is not increased to adjust the system, thus avoiding excessive water flow that could further reduce the wall temperature of the second heat exchanger 5 and trigger condensation. This achieves dual protection of speed reduction to prevent water carry-through and water flow control to prevent condensation, taking into account both water blow-through prevention and cooling stability.

[0033] In the control method of the back panel air conditioner for preventing water blowing described in this embodiment, in step A4, the opening degree of the electrically controlled valve 61 is gradually reduced periodically. By gradually reducing the opening degree of the electrically controlled valve 61 periodically (e.g., 1% / 3s), the wall temperature of the first heat exchanger 3 and the second heat exchanger 5 is slowly increased by gradually reducing the water flow. This avoids a sudden drop in cooling capacity due to a sudden reduction in water flow, achieving a balance between suppressing condensation and maintaining the basic cooling capacity. This solves the water blowing problem in high-risk scenarios and ensures that the heat dissipation needs of the computer room are not interrupted.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A water-resistant back panel air conditioner, characterized in that: It includes an air inlet side (1), an air outlet side (2), a first heat exchanger (3), and a second heat exchanger (5); the second heat exchanger (5) is located between the air outlet side (2) and the first heat exchanger (3); the first heat exchanger (3) is equipped with a coil (31); the air flow direction in the horizontal direction between the air inlet side (1) and the air outlet side (2) is opposite to the liquid flow direction in the horizontal direction in the coil (31); The back panel air conditioner with anti-blowing function also includes a first water inlet pipe (41), a first water outlet pipe (42), and a second water outlet pipe (6); the first water inlet pipe (41) is connected to the side of the coil (31) near the air outlet side (2); the first water outlet pipe (42) is connected to the side of the coil (31) near the air inlet side (1) and one end of the second heat exchanger (5); the second water outlet pipe (6) is connected to the other end of the second heat exchanger (5); The air outlet side (2) is equipped with a fan (7); the first water inlet pipe (41) and / or the second water outlet pipe (6) are equipped with an electric control valve (61).

2. The water-proof back panel air conditioner according to claim 1, characterized in that: The second heat exchanger (5) is arranged at an interval from the first heat exchanger (3); The second heat exchanger (5) is arranged in parallel with the first heat exchanger (3).

3. A water-proof back panel air conditioner according to claim 1, characterized in that: The first water inlet pipe (41) is connected to the top of the coil (31) near the air outlet side (2); the first water outlet pipe (42) is connected to the bottom of the coil (31) near the air inlet side (1); the second water outlet pipe (6) is connected to the top of the second heat exchanger (5); and the first water outlet pipe (42) is connected to the bottom of the second heat exchanger (5).

4. A water-proof back panel air conditioner according to claim 1, characterized in that: The back panel air conditioner that prevents water blowing also includes a water collection tray (8); the first heat exchanger (3) and the second heat exchanger (5) are both located on the water collection tray (8).

5. A water-proof back panel air conditioner according to claim 1, characterized in that: The first inlet pipe (41) is equipped with a first inlet water temperature sensor (91); the first outlet pipe (42) is equipped with a second inlet water temperature sensor (92); the second outlet pipe (6) is equipped with an outlet water temperature sensor (93); The air inlet side (1) is provided with a first temperature and humidity sensor (94); a second temperature and humidity sensor (95) is provided between the first heat exchanger (3) and the second heat exchanger (5); and a third temperature and humidity sensor (96) is provided on the air outlet side (2).

6. A control method for a back-panel air conditioner with anti-blowing properties according to any one of claims 1-5, characterized in that: Includes the following steps: Step S1: Detect the inlet water temperature and the inlet air dew point temperature of the first heat exchanger (3). If the inlet water temperature of the first heat exchanger (3) is greater than the inlet air dew point temperature of the first heat exchanger (3), proceed to step A1; if the inlet water temperature of the first heat exchanger (3) is not greater than the inlet air dew point temperature of the first heat exchanger (3), proceed to step S2. Step A1: The rated speed of the fan (7) is switched to the first preset speed value; the real-time speed of the fan (7) is adjusted according to the system PI control requirements based on the first preset speed value; Step S2: Detect the inlet water temperature, the inlet air dew point temperature, and the inlet air dry bulb temperature of the second heat exchanger (5); if the inlet water temperature of the second heat exchanger (5) is greater than the inlet air dry bulb temperature of the second heat exchanger (5), proceed to step A2; otherwise, proceed to step S3. Step A2: The rated speed of the fan (7) is switched to the second preset speed value; the real-time speed of the fan (7) is adjusted according to the system PI control requirements based on the second preset speed value; Step S3: If the inlet water temperature of the second heat exchanger (5) is not greater than the inlet dry bulb temperature of the second heat exchanger (5) and the inlet water temperature of the second heat exchanger (5) is greater than the inlet dew point temperature of the second heat exchanger (5), proceed to step A3; otherwise, proceed to step S4. Step A3: The rated speed of the fan (7) is switched to the third preset speed value; the real-time speed of the fan (7) is adjusted according to the system PI control requirements based on the third preset speed value. Step S4: If the inlet water temperature of the second heat exchanger (5) is not greater than the inlet dew point temperature of the second heat exchanger (5), proceed to step A4. Step A4: The rated speed of the fan (7) is switched to the fourth preset speed value; the real-time speed of the fan (7) is adjusted according to the system PI control requirements based on the fourth preset speed value. The first preset speed value is greater than the second preset speed value; The second preset speed value is greater than the third preset speed value; The third preset speed value is greater than the fourth preset speed value.

7. The control method for the anti-water-blowing back panel air conditioner according to claim 6, characterized in that: In step A1, the opening degree of the solenoid valve (61) is adjusted according to the system PI control requirements.

8. The control method for the anti-water-blowing back panel air conditioner according to claim 6, characterized in that: In step A2, the opening degree of the solenoid valve (61) is adjusted according to the system PI control requirements.

9. The control method for the anti-water-blowing back panel air conditioner according to claim 6, characterized in that: In step A3, the opening degree of the solenoid valve (61) is adjusted according to the system PI control requirements, and the opening degree is not increased when the cumulative positive deviation is reached.

10. The control method for the anti-water-blowing back panel air conditioner according to claim 6, characterized in that: In step A4, the opening degree of the solenoid valve (61) gradually decreases periodically.

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