A fresh air conditioning system and control method for clean operating rooms of different sizes

Abstract

This invention provides a fresh air conditioning system and control method for clean operating rooms of different sizes, belonging to the field of medical air conditioning technology. It includes a fresh air conditioning unit and an operating room. The fresh air conditioning unit is located outside the operating room, and a control unit is installed at its location. A multi-stage air supply unit connects the output end of the fresh air conditioning unit to the operating room, and a multi-stage return air unit connects the input end of the fresh air conditioning unit to the operating room. By supplying outside air into the fresh air conditioning unit and then opening an electric air valve to deliver mixed air to the operating room, while simultaneously monitoring the indoor temperature, a two-stage control method is used to adjust the electric air valve to achieve the set temperature. Return air flows back to the fresh air conditioning unit through a main return air duct, completing the circulation. This invention solves the problems of excessively low outlet temperature when using a single convection air conditioner to reduce indoor heat load in clean operating rooms, and the decreased temperature control capability for large clean operating rooms after adding a radiant air conditioning unit.

Description

Technical Field

[0001] This invention relates to the field of medical air conditioning technology, and in particular to a fresh air conditioning system and control method for clean operating rooms of different sizes. Background Technology

[0002] Clean operating rooms have strict requirements for environmental indicators such as temperature, humidity, and cleanliness. The surgical area must be located within the main flow zone of clean air, meaning the air conditioning unit's vents are typically positioned above the operating table. In a convection-type air conditioning system, cold air removes the indoor heat load. However, due to the low temperature at the air vents, the surgeon, nurses, and patients in the operating area are exposed to a lower ambient temperature, which is unfavorable for the surgeon and poses a risk of hypothermia to the patients.

[0003] Some clean operating rooms now employ air handling systems that combine fresh air handling units (FLU) with radiant air conditioning. These systems utilize air vents positioned in the center of the operating room ceiling to regulate humidity and cleanliness. Radiant panels installed on the inner walls of the operating room alter the temperature through radiant and convective heat exchange, creating a relatively comfortable environment for surgeons and patients without compromising humidity and cleanliness. The radiant panels used in clean operating rooms typically employ gas as the heat exchange medium. The gas is heated or cooled by the radiant air conditioning unit, and the treated gas is then distributed through the main air supply duct to the inlets of the hollow radiant panels installed in the walls. After heat exchange with the panels, the gas flows out from the outlets at the bottom of the radiant panels and collects in the return air duct, thus creating a circulation loop.

[0004] However, existing technologies for regulating the temperature of clean operating rooms using radiant air conditioning and radiant panels still have the following problems:

[0005] 1. The radiant panels inside the wall have poor cooling or heating capacity for objects that are far away, which may cause the local temperature in the operating room to be too high or too low. Increasing the air intake to enhance its radiant heat exchange capacity has limited effect and will lead to unnecessary energy consumption.

[0006] 2. Clean operating rooms with large adjustable radiant panels inside the walls take a long time to reach the set temperature, which is not conducive to the conduct of surgery. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a fresh air conditioning system and control method for clean operating rooms of different sizes. This invention solves the problems of excessively low outlet temperature when a single convection air conditioner is used to reduce the indoor heat load in a clean operating room, and the reduced temperature control capability for large clean operating rooms after adding a radiant air conditioning unit. Furthermore, it utilizes a two-stage control method to achieve temperature uniformity within the clean operating room.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] A fresh air conditioning system for clean operating rooms of different sizes includes a fresh air conditioning unit and an operating room. The fresh air conditioning unit is located outside the operating room. A control unit is located at the position of the fresh air conditioning unit. The output end of the fresh air conditioning unit is connected to the operating room via a multi-stage air supply unit. The input end of the fresh air conditioning unit is connected to the operating room via a multi-stage air return unit.

[0010] Preferably, the multi-stage air supply unit consists of a main air supply duct and several branch air supply ducts. The branch air supply ducts include a primary air supply duct, a secondary air supply duct, and a tertiary air supply duct. The primary, secondary, and tertiary air supply ducts are all connected to the main air supply duct, which is connected to the fresh air conditioning unit.

[0011] Preferably, a central air supply vent is provided in the middle of the ceiling of the operating room, a high-efficiency filter is provided above the central air supply vent, a first sensor is provided at one end of the high-efficiency filter, the high-efficiency filter is connected to the primary air supply duct, and a first electric air valve is provided between the primary air supply duct and the high-efficiency filter to regulate the amount of fresh air entering the operating room.

[0012] Preferably, a second electric air valve is provided on the main duct of the secondary air supply pipe, and two branch pipes are provided at the bottom of the second electric air valve. The two branch pipes are respectively connected to the two side walls of the operating room, and hollow radiant panels are provided inside the walls of the operating room. The hollow radiant panels are respectively connected to the corresponding branch pipes through air supply valves.

[0013] Preferably, four sets of first air outlets are provided at the four corners of the ceiling of the operating room. A second sensor is provided at the position of each of the four sets of first air outlets. Each of the four sets of first air outlets is connected to the three-stage air supply duct. A third electric air valve is provided between the three-stage air supply duct and each of the four sets of first air outlets. The third electric air valve has the same function as the first electric air valve.

[0014] Preferably, a third sensor is also installed inside the operating room. The third sensor, the first sensor, and the second sensor are all connected to the control unit. The control unit includes a main controller and a secondary controller. The main controller is connected to the secondary controller, and the secondary controller is connected to the fresh air conditioning unit. The main controller is also connected to a damper controller for regulating the dampers in various parts of the system.

[0015] Preferably, the fresh air conditioning unit consists of a cooling end, a heating end, and a regulating fan. The cooling end, the heating end, and the regulating fan are all connected to the secondary controller for regulating the mixed air temperature and flow rate of the fresh air conditioning unit.

[0016] Preferably, the multi-stage return air unit consists of a main return air duct and several branch return air ducts. The branch return air ducts are respectively connected to return air ducts installed on the walls of the operating room. All return air ducts are connected to the main return air duct, which is connected to the fresh air air conditioning unit.

[0017] This invention also provides a control method for a fresh air conditioning system for clean operating rooms of different sizes, comprising the following steps:

[0018] S1. Based on the requirements of indoor temperature, humidity and cleanliness of the clean operating room, the ambient air is sent into the fresh air conditioning unit, mixed with the return air, and the mixed air after primary filtration, temperature and humidity handling, and secondary filtration is sent into the main air supply duct.

[0019] S2. The main controller regulates the air valve controller to open the first electric air valve, and delivers mixed air into the operating room through the central air outlet, ensuring that the air volume of the central air outlet reaches the minimum fresh air volume required by the operating room.

[0020] S3. By adjusting the air valve controller, the second electric air valve is opened, and the air supply valve at the hollow radiant panel is adjusted to gradually increase the air volume of the hollow radiant panel in the wall until the rated air intake is reached.

[0021] S4. Monitor the changes in ambient temperature in the operating room through the third sensor, set the monitoring time interval and temperature, and determine whether the third electric air valve needs to be opened to gradually increase the air flow of the first air outlet to ensure that the operating room reaches the set temperature, thereby achieving temperature control in the operating room.

[0022] S5. After the air supply to the operating room is completed, the return air in the operating room is mixed with the return air from the hollow radiant panel through the return air duct, and then collected through the branch pipes of the return air duct to the main return air duct, and then flows back to the fresh air air conditioning unit to complete the circulation.

[0023] Preferably, S4 specifically includes:

[0024] If the operating room temperature does not reach the set temperature, the third electric air valve is opened. At the same time, the second sensor monitors the air temperature, pressure, cleanliness and humidity of the first air outlet. Then, the third electric air valve is controlled by PID to gradually increase the air flow of the first air outlet until the operating room temperature reaches the set temperature, and the air supply conditions of each air outlet are maintained.

[0025] If the operating room temperature has reached the set temperature, the third electric air valve will not be opened, and the current air supply conditions at each air supply position will be maintained to achieve temperature control in the operating room.

[0026] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0027] This invention provides a fresh air conditioning system and control method for clean operating rooms of different sizes. It uses a fresh air conditioning unit to provide purified air and radiant panel airflow, eliminating the need for a radiant air conditioning unit, thereby reducing the power consumption and initial investment cost of the air conditioning unit used in the operating room. Through the main controller, it first ensures that the minimum fresh air volume, cleanliness, and humidity of the air supply vent in the center of the ceiling meet the requirements. At the same time, it uses hollow radiant panels in the walls to change the indoor ambient temperature. If the temperature near the surgical area does not reach the set temperature range within a set time, the first air supply vents in the four corners of the ceiling are opened. Through the two-stage control of the radiant panels and the air supply in the four corners of the ceiling, the ambient temperature in the operating room is changed more quickly. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a layout diagram of a fresh air conditioning system for clean operating rooms of different sizes according to the present invention;

[0030] Figure 2 This is a diagram showing the location of the air supply vents on the ceiling of a clean operating room, provided in Embodiment 1 of the present invention.

[0031] Figure 3 This is a flowchart of the control method provided in Embodiment 1 of the present invention;

[0032] Figure 4 This is a schematic diagram of the control method provided in Embodiment 1 of the present invention;

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Fresh air handling unit; 2. Cooling end; 3. Heating end; 4. Control fan; 5. Main air supply duct; 6. Primary air supply duct; 7. Secondary air supply duct; 8. Tertiary air supply duct; 9. First electric damper; 10. High-efficiency filter; 11. Central air outlet; 12. First sensor; 13. Second electric damper; 14. Hollow radiant panel; 15. Air supply valve; 16. First air outlet; 17. Second sensor; 18. Third electric damper; 19. Third sensor; 20. Main controller; 21. Secondary controller; 22. Main return air duct; 23. Return air duct. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] To make the objectives, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] like Figure 1 As shown, the present invention provides a fresh air conditioning system for clean operating rooms of different sizes, including a fresh air conditioning unit 1 and an operating room. The fresh air conditioning unit 1 is located outside the operating room. A control unit is provided at the location of the fresh air conditioning unit 1 to control the entire system. The output end of the fresh air conditioning unit 1 is connected to the operating room via a multi-stage air supply unit, and the input end of the fresh air conditioning unit 1 is connected to the operating room via a multi-stage air return unit.

[0039] The multi-stage air supply unit consists of a main air supply duct 5 and several branch air supply ducts. These branch ducts include a primary air supply duct 6, a secondary air supply duct 7, and a tertiary air supply duct 8. All three ducts are connected to the main air supply duct 5, which in turn connects to the fresh air conditioning unit 1, supplying mixed air to the operating room. A central air supply outlet 11 is located in the center of the operating room ceiling. A high-efficiency particulate air (HEPA) filter 10 is installed above the central outlet 11. A first sensor 12 is installed at one end of the HEPA filter 10. The HEPA filter 10 is connected to the primary air supply duct 6, and a first electric damper 9 is installed between the primary air supply duct 6 and the HEPA filter 10 to regulate the amount of fresh air entering the operating room.

[0040] A second electric air valve 13 is installed on the main pipe of the secondary air supply pipe 7. The bottom of the second electric air valve 13 is provided with two branch pipes, which are connected to the two side walls of the operating room respectively. Hollow radiant panels 14 are installed inside the walls of the operating room, and the hollow radiant panels 14 are connected to the corresponding branch pipes through air supply valves 15.

[0041] Reference Figure 2 The operating room ceiling has four sets of first air supply outlets 16 at the four corners. Each of the four sets of first air supply outlets 16 is equipped with a second sensor 17. All four sets of first air supply outlets 16 are connected to a tertiary air supply duct 8. A third electric air valve 18 is installed between the tertiary air supply duct 8 and each of the four sets of first air supply outlets 16. The third electric air valve 18 functions the same as the first electric air valve 9. Inside the operating room, there is also a third sensor 19. The third sensor 19, the first sensor 12, and the second sensor 17 are all connected to a control unit. The control unit includes a main controller 20 and a secondary controller 21. The main controller 20 is connected to the secondary controller 21, and the secondary controller 21 is connected to the fresh air conditioning unit 1. The main controller 20 is also connected to an air valve controller for regulating the various air valves in the system.

[0042] In addition, the fresh air conditioning unit 1 consists of a cooling end 2, a heating end 3, and a regulating fan 4. The fresh air conditioning unit also includes a pre-filter and a medium-efficiency filter, which are conventional technologies and have not been elaborated upon further. The cooling end 2, heating end 3, and regulating fan 4 are all connected to the secondary controller 21 to regulate the mixed air temperature and flow rate of the fresh air conditioning unit 1. The multi-stage return air unit consists of a main return air duct 22 and several branch return air ducts 23. These branch return air ducts 23 are connected to return air ducts 23 installed on the walls of the operating room, and all of them are connected to the main return air duct 22, which in turn connects to the fresh air conditioning unit 1.

[0043] Reference Figure 3 The control method for the above-mentioned fresh air conditioning system includes the following steps:

[0044] S1. Based on the requirements of indoor temperature, humidity and cleanliness of the clean operating room, the ambient air is sent into the fresh air conditioning unit, mixed with the return air, and the mixed air after primary filtration, temperature and humidity handling, and secondary filtration is sent into the main air supply duct.

[0045] S2. The main controller regulates the air valve controller to open the first electric air valve, and delivers mixed air into the operating room through the central air outlet, ensuring that the air volume of the central air outlet reaches the minimum fresh air volume required by the operating room.

[0046] S3. By adjusting the air valve controller, the second electric air valve is opened, and the air supply valve at the hollow radiant panel is adjusted to gradually increase the air volume of the hollow radiant panel in the wall until the rated air intake is reached.

[0047] S4. Monitor the changes in ambient temperature in the operating room through the third sensor, set the monitoring time interval and temperature, and determine whether the third electric air valve needs to be opened to gradually increase the air flow of the first air outlet to ensure that the operating room reaches the set temperature, thereby achieving temperature control in the operating room.

[0048] In step S4, refer to Figure 4 The provided schematic diagram shows that T0 represents the temperature of the surgical area, and T... s A temperature is set for the room, where 'a' represents the allowable temperature fluctuation range, and 'time' is the set time for changing the room temperature using only the hollow radiant panels within the wall; in this embodiment, the set time is 20 minutes. Specifically, this includes:

[0049] (1) If the operating room temperature does not reach the set temperature (when |T s When |T0|>a and time>20mins), the third electric air valve is opened. Simultaneously, the second sensor monitors the air temperature, pressure, cleanliness, and humidity at the first air outlet. Then, PID control of the third electric air valve gradually increases the airflow from the first air outlet until the operating room temperature reaches the set temperature (i.e., |T0|>a). s -T0|≤a), and maintain the current air supply conditions at each air supply location;

[0050] (2) If the operating room temperature has reached the set temperature (i.e., satisfies |T) s If -T0|≤a), the third electric air valve will not be opened, and the current air supply conditions at each air supply position will be maintained to achieve temperature control in the operating room.

[0051] S5. After the air supply to the operating room is completed, the return air in the operating room is mixed with the return air from the hollow radiant panel through the return air duct, and then collected through the branch pipes of the return air duct to the main return air duct, and then flows back to the fresh air air conditioning unit to complete the circulation.

[0052] Therefore, the above-mentioned fresh air conditioning system and control method for clean operating rooms of different sizes uses a fresh air conditioning unit to provide purified air and radiant panel airflow, eliminating the need for a radiant air conditioning unit, thereby reducing the power consumption and initial investment cost of the air conditioning unit used in the operating room; and through the main controller, it first ensures that the minimum fresh air volume, cleanliness, and humidity of the air supply vent in the center of the ceiling meet the requirements, while using the hollow radiant panels in the wall to change the indoor ambient temperature. If the temperature near the operating area does not reach the set temperature range within the set time, the first air supply vents in the four corners of the ceiling are opened. Through the two-stage control of the radiant panels and the air supply in the four corners of the ceiling, the ambient temperature in the operating room is changed more quickly.

[0053] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A control method for a fresh air conditioning system for clean operating rooms of different sizes, characterized in that, Includes the following steps: S1. Based on the requirements of indoor temperature, humidity and cleanliness of the clean operating room, the ambient air is sent into the fresh air conditioning unit, mixed with the return air, and the mixed air after primary filtration, temperature and humidity handling, and secondary filtration is sent into the main air supply duct. S2. The main controller regulates the air valve controller to open the first electric air valve, and delivers mixed air into the operating room through the central air outlet, ensuring that the air volume of the central air outlet reaches the minimum fresh air volume required by the operating room. S3. By adjusting the air valve controller, the second electric air valve is opened, and the air supply valve at the hollow radiant panel is adjusted to gradually increase the air volume of the hollow radiant panel in the wall until the rated air intake is reached. S4. Monitor the ambient temperature changes in the operating room using a third sensor, set the monitoring time interval and temperature, and determine whether the third electric air valve needs to be opened to gradually increase the airflow from the first air outlet to ensure the operating room reaches the set temperature, thereby achieving temperature control in the operating room; specifically including: If the operating room temperature does not reach the set temperature, the third electric air valve is opened. At the same time, the second sensor monitors the air temperature, pressure, cleanliness and humidity of the first air outlet. Then, the third electric air valve is controlled by PID to gradually increase the air flow of the first air outlet until the operating room temperature reaches the set temperature, and the air supply conditions of each air outlet are maintained. If the operating room temperature has reached the set temperature, the third electric air valve will not be opened, and the current air supply conditions at each air supply position will be maintained to achieve temperature control in the operating room. S5. After the air supply in the operating room is completed, the return air in the operating room is mixed with the return air from the hollow radiant panel through the return air duct, and then collected through the branch pipes of the return air duct to the main return air duct, and flows back to the fresh air air conditioning unit to complete the circulation. The fresh air conditioning system implementing the above control method includes a fresh air conditioning unit and an operating room. The fresh air conditioning unit is located outside the operating room. A control unit is installed at the location of the fresh air conditioning unit. A multi-stage air supply unit is connected between the output end of the fresh air conditioning unit and the operating room. A multi-stage return air unit is connected between the input end of the fresh air conditioning unit and the operating room. The multi-stage air supply unit consists of a main air supply duct and several branch air supply ducts. The branch air supply ducts include a primary air supply duct, a secondary air supply duct, and a tertiary air supply duct. The primary, secondary, and tertiary air supply ducts are all connected to the main air supply duct, which is connected to the fresh air conditioning unit. The operating room has a central air supply vent in the middle of the ceiling. A high-efficiency filter is installed above the central air supply vent. A first sensor is installed at one end of the high-efficiency filter. The high-efficiency filter is connected to the primary air supply duct. A first electric air valve is installed between the primary air supply duct and the high-efficiency filter to regulate the amount of fresh air entering the operating room. A second electric air valve is installed on the main duct of the secondary air supply pipe. The bottom of the second electric air valve is provided with two branch pipes. The two branch pipes are respectively connected to the two side walls of the operating room. Hollow radiant panels are installed inside the walls of the operating room. The hollow radiant panels are respectively connected to the corresponding branch pipes through air supply valves. The operating room has four sets of first air outlets at the four corners of the ceiling. A second sensor is installed at the location of each of the four sets of first air outlets. Each of the four sets of first air outlets is connected to the three-stage air supply duct. A third electric air valve is installed between the three-stage air supply duct and each of the four sets of first air outlets. The third electric air valve has the same function as the first electric air valve. A third sensor is also installed inside the operating room.

2. The control method for a fresh air conditioning system for clean operating rooms of different sizes according to claim 1, characterized in that, The third sensor, the first sensor, and the second sensor are all connected to the control unit. The control unit includes a main controller and a sub-controller. The main controller is connected to the sub-controller, and the sub-controller is connected to the fresh air conditioning unit. The main controller is also connected to a damper controller for regulating the dampers in various parts of the system.

3. The control method for a fresh air conditioning system for clean operating rooms of different sizes according to claim 2, characterized in that, The fresh air conditioning unit consists of a cooling end, a heating end, and a regulating fan. The cooling end, heating end, and regulating fan are all connected to the secondary controller and are used to regulate the mixed air temperature and flow rate of the fresh air conditioning unit.

4. The control method for a fresh air conditioning system for clean operating rooms of different sizes according to claim 1, characterized in that, The multi-stage return air unit consists of a main return air duct and several branch return air ducts. The branch return air ducts are connected to return air ducts installed on the walls of the operating room. All return air ducts are connected to the main return air duct, which is connected to the fresh air conditioning unit.

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