Fireproof air conditioner and control method

Abstract

The application provides a fireproof air conditioner and a control method, which comprises the following steps: a blower and an air outlet are arranged in a cabinet; a liquid nitrogen storage tank is arranged on one side of a condenser, and the blower is arranged on the side of the condenser far from the liquid nitrogen storage tank; a nitrogen pressure relief valve is arranged on a spray port of the liquid nitrogen storage tank; an evaporator is arranged on one side of the liquid nitrogen storage tank; a temperature sensor is arranged at the air outlet, and the temperature sensor is used for detecting the temperature at the air outlet; a control module is signal-connected with the blower, the temperature sensor and the nitrogen pressure relief valve, the control module controls the opening degree of the nitrogen pressure relief valve according to the signal transmitted by the temperature sensor, so as to adjust the spray speed of the nitrogen sprayed from the spray port, and the control module controls the rotating speed of the blower according to the signal transmitted by the temperature sensor. The fireproof air conditioner and the control method solve the technical problem that the existing fireproof technology of the special air conditioner is imperfect in the related art, and the high-value air conditioner is easily scrapped due to fire.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, specifically to a fireproof air conditioner and its control method. Background Technology

[0002] Due to the specific applications of specialized air conditioning systems, they are often used in high-value equipment such as specialized computer rooms and wind turbine generator sets. In these applications, numerous safety requirements are often imposed on specialized air conditioning systems. As maintenance equipment for high-value units, these systems must not only provide cooling for daily operation but also, more importantly, safety. Electrical arcing is the most common cause of fires within these units, posing a significant challenge to ensuring the safe operation of specialized air conditioning systems.

[0003] Currently, high-value equipment such as wind turbine generators operate in special environments, with heights exceeding 100 meters above the ground. The most common fire prevention method is to install simple carbon dioxide or dry powder fire extinguishers in easily flammable areas. However, these extinguishers cannot automatically extinguish fires, making firefighting difficult and potentially rendering the multi-million dollar generators unusable.

[0004] Therefore, existing technologies need further development. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a fireproof air conditioner and control method to solve the technical problem that the existing special air conditioner fire prevention technology is imperfect and that high-value air conditioners are easily scrapped due to fire.

[0006] To achieve the above technical objectives, the present invention adopts the following technical solution: A fireproof air conditioner is provided, comprising: a cabinet, in which a blower and an air outlet for expelling air are installed; a liquid nitrogen storage tank, which is installed inside the cabinet, located on one side of the condenser, and the blower is located on the side of the condenser away from the liquid nitrogen storage tank; the liquid nitrogen storage tank stores liquid nitrogen; a nitrogen pressure relief valve is installed on the injection port of the liquid nitrogen storage tank; an evaporator, which is installed on one side of the liquid nitrogen storage tank; a temperature sensor, which is installed at the air outlet and is used to detect the temperature at the air outlet; and a control module, which is connected to the blower, the temperature sensor, and the nitrogen pressure relief valve respectively, and controls the opening of the nitrogen pressure relief valve through the signal transmitted from the temperature sensor to adjust the injection speed of nitrogen from the injection port; and controls the rotation speed of the blower through the signal transmitted from the temperature sensor.

[0007] Furthermore, the nitrogen pressure relief valve has a contact part, which opens the injection port when an external force touches the contact part.

[0008] Furthermore, the nitrogen pressure relief valve includes a vaporizer and a buffer device, both of which are located inside the injection port. The vaporizer is used to convert gaseous nitrogen into a vapor-liquid mixture, and the buffer device controls the uniform injection of nitrogen.

[0009] Furthermore, a replenishment port is provided on one side of the liquid nitrogen storage tank, through which nitrogen gas is replenished into the liquid nitrogen storage tank.

[0010] A control method applicable to the fireproof air conditioner as described above, the control method includes: when a fire occurs in the fireproof air conditioner, the control module adjusts the opening of the nitrogen pressure relief valve according to the temperature rise difference U per unit time, thereby controlling the injection speed of liquid nitrogen to extinguish the fire.

[0011] Furthermore, the injection speed includes a first injection speed and a second injection speed, wherein the first injection speed is less than the second injection speed.

[0012] Furthermore, the control method includes setting a first temperature threshold T1 and a second temperature threshold T2, and comparing the difference U with the first temperature threshold T1 and the second temperature threshold T2 respectively; when U≤T1, the control module adjusts the opening of the nitrogen pressure relief valve to extinguish the fire at a first injection speed; when T1<U<T2, the control module adjusts the opening of the nitrogen pressure relief valve to extinguish the fire at a first injection speed; when U≥T2, the control module adjusts the opening of the nitrogen pressure relief valve to extinguish the fire at a second injection speed.

[0013] Furthermore, within multiple adjacent unit time periods, multiple differences U are taken, and each difference U is compared with the first temperature threshold T1 and the second temperature threshold T2 respectively; when at least one difference U satisfies U≥T2, the control module adjusts the opening of the nitrogen pressure relief valve to extinguish the fire at the second injection speed; otherwise, the fire is extinguished at the first injection speed.

[0014] Furthermore, the first temperature threshold T1 is derived from the fire temperature rise curve formula: T1=345×log(8t+1), and the second temperature threshold T2 is derived from the fire temperature rise curve formula: T2=1080×(1-0.325et / 6-0.675e-2.5t), where t is the fire duration in minutes.

[0015] Furthermore, the first injection speed is 1L / 3.5s, and the second injection speed is 1L / 2s.

[0016] Beneficial effects:

[0017] 1. The control method of this invention distinguishes the liquid nitrogen injection rate per unit time according to the fire intensity at the fire site, and matches a suitable fire extinguishing plan according to the fire intensity, avoiding excessive nitrogen injection and saving fire extinguishing costs.

[0018] 2. By adopting the control method of the present invention, the safe temperature of the equipment can be set to prevent the unit from overheating, depending on the different working environment conditions of the application. The manual triggering unit built into this module can also be applied to special working conditions of different equipment, which greatly ensures the value of high-value units.

[0019] 3. The fireproof air conditioner of this invention adds liquid nitrogen cooling function. By combining with the air conditioner's own air supply system, a large amount of liquid nitrogen is sprayed out instantly. When a fire occurs, the liquid nitrogen quickly vaporizes, displacing oxygen in the air to achieve a fire extinguishing effect, thereby improving the reliability of the special air conditioner and ensuring the safe operation of the unit equipment.

[0020] 4. By adopting the control method of the present invention, the speed at which the liquid nitrogen fireproof module sprays liquid nitrogen can be adjusted by setting different temperature thresholds in the control module. This makes it easier to distinguish between high-value units and flammable chemicals, reduces the difficulty of maintenance after a fire in a high-value unit, and reduces economic losses.

[0021] 5. The fireproof air conditioner of this invention can effectively reduce equipment damage caused by fire by using built-in liquid nitrogen, protecting unit components and improving safety and reliability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the fireproof air conditioner used in an embodiment of the present invention from one perspective;

[0023] Figure 2 This is a structural schematic diagram of the fireproof air conditioner used in an embodiment of the present invention from another perspective;

[0024] Figure 3 This is a schematic diagram of the liquid nitrogen storage tank used in an embodiment of the present invention from one perspective;

[0025] Figure 4 This is a schematic diagram of the liquid nitrogen storage tank used in an embodiment of the present invention from another perspective.

[0026] The above figures include the following reference numerals:

[0027] 1. Cabinet; 11. Blower; 12. Air outlet; 2. Liquid nitrogen storage tank; 21. Injection port; 22. Nitrogen pressure relief valve; 23. Contact part; 24. Replenishment port; 3. Condenser; 4. Evaporator; 5. Control module. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0029] According to an embodiment of the present invention, a fireproof air conditioner is provided; please refer to [link / reference]. Figures 1 to 4 The system includes: a cabinet 1, which houses a blower 11 and an air outlet 12 for expelling air; a liquid nitrogen storage tank 2, which is located inside the cabinet 1 and situated on one side of the condenser 3, with the blower 11 positioned on the side of the condenser 3 away from the liquid nitrogen storage tank 2; the liquid nitrogen storage tank 2 stores liquid nitrogen; a nitrogen pressure relief valve 22 is installed on the injection port 21 of the liquid nitrogen storage tank 2; an evaporator 4, which is positioned on one side of the liquid nitrogen storage tank 2; a temperature sensor, which is located at the air outlet 12 and is used to detect the temperature at the air outlet 12; and a control module 5, which is connected to the blower 11, the temperature sensor, and the nitrogen pressure relief valve 22. The control module 5 uses the signal transmitted from the temperature sensor to control the opening of the nitrogen pressure relief valve 22, thereby adjusting the injection speed of nitrogen from the injection port 21; and the control module 5 uses the signal information transmitted from the temperature sensor to control the rotational speed of the blower 11.

[0030] In this embodiment of the fireproof air conditioner, the liquid nitrogen storage tank 2 is located inside the cabinet 1 on one side of the condenser 3. The condenser 3 dissipates heat to the outside of the cabinet 1, effectively preventing the temperature around the liquid nitrogen storage tank 2 from rising. The injection port 21 is opened or closed via the nitrogen pressure relief valve 22. An evaporator 4 is located below the liquid nitrogen storage tank 2. The evaporator 4 not only lowers the temperature inside the cabinet 1 but also cools the liquid nitrogen storage tank 2. The injection port 21 of the liquid nitrogen storage tank 2 is positioned opposite to the blower 11. The blower 11 not only supplies air to the entire cabinet 1 but also disperses the liquid nitrogen after it is injected. A temperature sensor is installed at the air outlet 12. The control module 5 is connected to the blower 11, the temperature sensor, and the nitrogen pressure relief valve 22. When a fire occurs, the temperature inside the cabinet 1 rises. The temperature sensor transmits a signal to the control module 5, which immediately increases the speed of the blower 11 to its maximum and adjusts the opening of the nitrogen pressure relief valve 22 according to the temperature rise, thereby implementing automatic fire suppression. This embodiment of the fireproof air conditioner combines with its own air supply system to instantly spray a large amount of liquid nitrogen. When a fire occurs, the liquid nitrogen rapidly vaporizes, displacing oxygen from the air and achieving a fire extinguishing effect. Liquid nitrogen itself has an expansion ratio as high as 1:646, which not only extinguishes fires quickly but also rapidly empties oxygen near the unit, minimizing economic losses caused by the fire. Furthermore, it is safe and reliable, and will not damage the electrical wiring or control systems of mechanical equipment after extinguishing the fire. This solves the technical problem in existing special air conditioner fireproofing technologies that are inadequate and easily lead to the scrapping of high-value air conditioners due to fires.

[0031] See Figure 3 In the fireproof air conditioner of this embodiment, the nitrogen pressure relief valve 22 has a contact part 23. When an external force touches the contact part 23, the nitrogen pressure relief valve 22 opens the injection port 21. The nitrogen pressure relief valve 22 is equipped with a contact part 23, which not only realizes intelligent control, but also allows for manual triggering according to actual conditions, meeting the needs of fire extinguishing and cooling under special working conditions.

[0032] In this embodiment of the fireproof air conditioner, the nitrogen pressure relief valve 22 includes a vaporizer and a buffer device, both of which are located inside the injection port 21. The vaporizer converts gaseous nitrogen into a vapor-liquid mixture, and the buffer device controls the uniform spraying of nitrogen. The vaporizer and buffer device are built into the injection port 21 to vaporize liquid nitrogen, forming a liquid nitrogen vapor-liquid mixture, which is then sprayed out at a uniform speed under the control of the buffer device. Liquid nitrogen, as the fire extinguishing agent in the fireproof air conditioner, produces a less reactive gas, improving equipment reliability and safety and reducing equipment loss in a fire.

[0033] See Figure 4In this embodiment of the fireproof air conditioner, a replenishment port 24 is provided on one side of the liquid nitrogen storage tank 2, through which nitrogen gas is replenished into the liquid nitrogen storage tank 2. When the liquid nitrogen is insufficient, it is replenished from the replenishment port 24 on one side of the liquid nitrogen storage tank 2. The supply method is simple and convenient, providing a guarantee for the fire prevention of the special air conditioner.

[0034] In this embodiment, the control method is applicable to the fire-resistant air conditioner described above. The control method includes: when a fire occurs in the fire-resistant air conditioner, the control module 5 adjusts the opening of the nitrogen pressure relief valve 22 according to the temperature difference U per unit time, thereby controlling the liquid nitrogen injection speed to extinguish the fire. In this embodiment, the control program collects temperature data at the air outlet 12, and adjusts the opening of the nitrogen pressure relief valve 22 according to the temperature difference U per unit time, thereby controlling the liquid nitrogen injection speed.

[0035] In the control method of this embodiment, the spray speed includes a first spray speed and a second spray speed, with the first spray speed being lower than the second spray speed. By setting two different spray speeds, two different fire extinguishing modes are established, and an appropriate spray speed is selected based on the size of the fire. Ensuring that the control module 5 can effectively extinguish the fire in the initial stage, fully utilizing liquid nitrogen not only reduces damage to the unit but also saves costs.

[0036] In the control method of this embodiment, the control method includes setting a first temperature threshold T1 and a second temperature threshold T2, and comparing the difference U between the first temperature threshold T1 and the second temperature threshold T2 respectively; when U≤T1, the control module 5 adjusts the opening of the nitrogen pressure relief valve 22 to extinguish the fire at a first spray rate; when T1<U<T2, the control module 5 adjusts the opening of the nitrogen pressure relief valve 22 to extinguish the fire at the first spray rate; when U≥T2, the control module 5 adjusts the opening of the nitrogen pressure relief valve 22 to extinguish the fire at a second spray rate. By comparing the difference U in temperature rise per unit time with the magnitude of the first temperature threshold T1 and the second temperature threshold T2, a fire extinguishing mode, i.e., the spray rate, that matches the fire intensity is selected.

[0037] When U≤T1, fire extinguishing is carried out at the first spray velocity;

[0038] When T1 < U < T2, fire extinguishing is carried out at the first injection velocity;

[0039] When U≥T2, fire extinguishing is carried out at the second jet velocity.

[0040] In the control method of this embodiment, multiple differences U are taken within adjacent unit time periods. Each difference U is compared with a first temperature threshold T1 and a second temperature threshold T2. When at least one difference U satisfies U≥T2, the control module 5 adjusts the opening of the nitrogen pressure relief valve 22 to extinguish the fire at a second spray speed; otherwise, the fire is extinguished at a first spray speed. In this embodiment, three temperature rise differences U are selected, namely U1, U2, and U3. That is, after the temperature sensor detects that the temperature inside the cabinet 1 exceeds the normal temperature of the cabinet, the control method checks the fire parameters within three seconds of the temperature rise and increases the speed of the blower 11 to the maximum speed within three seconds. By comparing the three parameters Tg1, Tg2, and Tg3 within three seconds, i.e., the temperature sensed by the temperature sensor per second within three seconds, a fire data model similar to the fire scene is immediately selected, i.e., an appropriate spray speed is selected.

[0041] The formulas for calculating each temperature rise difference are as follows:

[0042] U1 = Tg1 - Tg0;

[0043] U2 = Tg2 - Tg1;

[0044] U3 = Tg3 - Tg2, where Tg0 is the indoor temperature (°C) before the fire;

[0045] Specifically, Tg0 can be taken as 20℃.

[0046] When the temperature rise difference of any one of U1, U2 and U3 is greater than or equal to the second temperature threshold T2, the control module 5 adjusts the opening of the nitrogen pressure relief valve 22 to extinguish the fire at the second injection speed; otherwise, the fire is extinguished at the first injection speed. This control program can provide maximum protection for special air conditioning units and avoid damage to the unit caused by fire.

[0047] In the control method of this embodiment, the first temperature threshold T1 is obtained from the fire temperature rise curve formula: T1=345×log(8t+1), and the second temperature threshold T2 is obtained from the fire temperature rise curve formula: T2=1080×(1-0.325et / 6-0.675e-2.5t), where t is the fire duration in minutes.

[0048] Specialized air conditioning systems have unique applications. For example, when used in chemical storage facilities, the temperature rises dramatically in a short time after a fire, requiring the spray rate to be adjusted to the maximum to extinguish the fire as quickly as possible. Therefore, in the control method of this embodiment, two spray rates correspond to two operating conditions: non-flammable substances and flammable substances. The two operating conditions are automatically set by the temperature sensing system of the control module according to the specific application, thereby controlling the spray rate of liquid nitrogen.

[0049] According to the formula for the fire temperature rise curve:

[0050] T1 = 345 × log(8t + 1);

[0051] T2=1080×(1-0.325et / 6-0.675e-2.5t);

[0052] Where t is the duration of the fire (min).

[0053] When the first injection speed is less than the second injection speed, and all temperature rise differences U1, U2 and U3 are less than the second temperature threshold T2, the working condition is identified as an environment for non-flammable substances, corresponding to the first temperature threshold T1; when one of the temperature rise differences U1, U2 and U3 is greater than or equal to the second temperature threshold T2, the working condition is identified as an environment for flammable substances, corresponding to the second temperature threshold T2.

[0054] In the control method of this embodiment, the first injection rate is 1L / 3.5s, and the second injection rate is 1L / 2s. After a fire occurs, the control module 5 detects the fire temperature rise parameters at the scene over three seconds. By comparing the three parameters Tg1, Tg2, and Tg3 (i.e., the temperature sensed by the temperature sensor per second within three seconds), it immediately selects and implements the corresponding fire extinguishing measures. The liquid nitrogen injection rates for the two fire extinguishing schemes are 1L / 3.5s (first injection rate) and 1L / 2s (second injection rate), respectively. Then, the blower 11 blows out a mixture of gas and liquid nitrogen to achieve an instantaneous diffusion effect. The control module 5 can calculate the actual situation at the fire scene over a three-second period, match and select the appropriate fire condition type, and determine the nitrogen injection rate.

[0055] In this embodiment of the fireproof air conditioner, the liquid nitrogen storage tank 2 is a double-layered container. The inner container is a high-pressure container that holds liquid nitrogen, while the outer container is a vacuum container that serves to insulate against temperature. The nitrogen pressure relief valve 22 is located in the middle of the liquid nitrogen storage tank 2 and is fixed to the outer wall of the inner container by circumferential welding. There is an interlayer between the inner and outer containers, which needs to be evacuated to a vacuum. On this basis, heat-insulating material is wrapped and filled between the inner and outer containers.

[0056] In this embodiment, the control method uses a liquid nitrogen storage tank 2 and a control module 5 to achieve intelligent control, meeting the operational requirements of special air conditioners and ensuring the safety of the high-value unit itself. The liquid nitrogen storage tank 2 has a simple and versatile structure, and can be applied to all units requiring this function. The unit itself is relatively small in size, and multiple units can be arranged at various angles around a large unit to form multiple cold sources, improving the fire extinguishing effect and quickly suppressing fires.

[0057] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0058] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0059] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0060] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0061] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A fire-resistant air conditioning control method, characterized in that, Fire-resistant air conditioners include: Cabinet (1), wherein a blower (11) and an air outlet (12) for expelling air out are provided inside the cabinet (1). A liquid nitrogen storage tank (2) is installed inside the cabinet (1). The liquid nitrogen storage tank (2) is located on one side of the condenser (3). The blower (11) is installed on the side of the condenser (3) away from the liquid nitrogen storage tank (2). Liquid nitrogen is stored in the liquid nitrogen storage tank (2). A nitrogen pressure relief valve (22) is installed on the injection port (21) of the liquid nitrogen storage tank (2). Evaporator (4), the evaporator (4) is disposed on one side of the liquid nitrogen storage tank (2); A temperature sensor is provided at the air outlet (12) and is used to detect the temperature at the air outlet (12). The control module (5) is connected to the blower (11), the temperature sensor and the nitrogen pressure relief valve (22) respectively. The control module (5) controls the opening of the nitrogen pressure relief valve (22) through the signal transmitted by the temperature sensor to adjust the injection speed of nitrogen from the injection port (21); the control module (5) controls the rotation speed of the blower (11) through the signal transmitted by the temperature sensor. The injection port (21) of the liquid nitrogen storage tank (2) is arranged opposite to the blower (11); The control method includes: when the fireproof air conditioner is on fire, the control module (5) adjusts the opening of the nitrogen pressure relief valve (22) according to the temperature difference U per unit time, thereby controlling the injection speed of liquid nitrogen to extinguish the fire.

2. The fireproof air conditioning control method according to claim 1, characterized in that, The nitrogen pressure relief valve (22) has a contact part (23). When an external force touches the contact part (23), the nitrogen pressure relief valve (22) opens the injection port (21).

3. The fireproof air conditioning control method according to claim 2, characterized in that, The nitrogen pressure relief valve (22) includes a vaporizer and a buffer device. Both the vaporizer and the buffer device are located inside the injection port (21). The vaporizer is used to convert gaseous nitrogen into a gas-liquid mixture, and the buffer device controls the uniform injection of nitrogen.

4. The fireproof air conditioning control method according to claim 3, characterized in that, A replenishment port (24) is provided on one side of the liquid nitrogen storage tank (2), through which nitrogen gas is replenished into the liquid nitrogen storage tank (2).

5. The fireproof air conditioning control method according to claim 1, characterized in that, The injection speed includes a first injection speed and a second injection speed, wherein the first injection speed is less than the second injection speed.

6. The fireproof air conditioning control method according to claim 5, characterized in that, The control method includes setting a first temperature threshold T1 and a second temperature threshold T2, and comparing the difference U with the first temperature threshold T1 and the second temperature threshold T2 respectively. When U≤T1, the control module (5) adjusts the opening of the nitrogen pressure relief valve (22) to extinguish the fire at the first injection speed; When T1 < U < T2, the control module (5) adjusts the opening of the nitrogen pressure relief valve (22) to extinguish the fire at the first injection speed; When U≥T2, the control module (5) adjusts the opening of the nitrogen pressure relief valve (22) to extinguish the fire at the second injection speed.

7. The fireproof air conditioning control method according to claim 6, characterized in that, In multiple adjacent time units, a multiple difference value U is taken, and each difference value U is compared with the first temperature threshold T1 and the second temperature threshold T2 respectively; When at least one difference U satisfies U≥T2, the control module (5) adjusts the opening of the nitrogen pressure relief valve (22) to extinguish the fire at the second injection speed; otherwise, it extinguishes the fire at the first injection speed.

8. The fireproof air conditioning control method according to claim 7, characterized in that, The first temperature threshold T1 is obtained from the fire temperature rise curve formula: T1=345×log(8t+1), and the second temperature threshold T2 is obtained from the fire temperature rise curve formula: T2=1080×(1-0.325et / 6-0.675e-2.5t), where t is the fire duration in minutes.

9. The fireproof air conditioning control method according to claim 8, characterized in that, The first injection speed is 1L / 3.5s, and the second injection speed is 1L / 2s.

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