CN206338863U - Low noise block air cleaning system - Google Patents

Abstract

The utility model is related to a kind of low noise block air cleaning system, and it includes：For the integral rack of medical air draft fresh air exported after being handled to input fresh air and after air draft and to it；Return air handles air-blow ceiling, and it is used to carry out the fresh air and return air of introducing uniformly mixing, purification filtering and is exported it with weak turbulence form；And return air inlet, it connects in medical room with return air passageway return air is incorporated into return air processing air-blow ceiling.Infection rate after abortion operation can substantially be reduced, substantially reduce energy consumption, and significantly reduce simultaneously the construction cost of operating room, completion time of project (high integration equipment and modularization install significantly reduce construction cost and complexity) and space requirement (without Special machine room, valve it is few and without return air duct), and noise can also be significantly reduced on the premise of the enough air quantity of guarantee.

Description

Low noise modular air purification system

technical field

The utility model generally relates to the field of medical ventilation facilities, in particular to a low-noise modular air purification system and a corresponding operating room.

Background technique

Today, there are about 25,000 hospitals in our country. Since about 40% of these hospitals were built in 1980, their medical conditions can no longer meet the requirements of modern medical care, so there are urgent and large-scale improvement and expansion tasks. How to reduce the cost of reconstruction and expansion is a significant goal. In addition, the medical industry is related to the life and health of the people. How to shorten the construction period of the hospital is also an important task.

As the requirements for the medical environment increase, the medical air purification system is also developing in the direction of high power and large air volume. However, an important factor restricting this development trend is the maximum noise requirement. According to GB 50333-2013 "Technical Specifications for Construction of Clean Operating Departments in Hospitals", the noise of Class I operating rooms should be ≤51dB(A), and the noise of Class II, III, and IV operating rooms should be ≤49dB(A). An important source of noise in the air purification system is the fan, and the noise of the fan is generally proportional to its power or air volume. Therefore, it is precisely because of this high requirement for noise that many air purification systems that use high-power fans to meet the air volume requirements exceed the maximum allowable noise standard threshold, and thus cannot be put into medical applications. Therefore, how to reduce noise under the premise of ensuring sufficient air volume requirements has become an important topic in the research and development of air purification systems.

At present, mainstream medical ventilation facilities use unidirectional flow clean technology. Unidirectional flow, also known as "laminar flow", refers to the airflow passing through the air purification device or clean area in the same direction and with roughly parallel streamlines. The judgment condition of unidirectional flow is: the deviation between the streamline passing through the clean area and the ideal straight line does not exceed 14°. However, the latest medical research data shows that unidirectional air flow operating room has a higher risk of postoperative infection. Moreover, most of the one-way flow air purification systems adopt the central air-conditioning mode, which has the disadvantages of high energy consumption, long pipelines (air ducts, air-conditioning cold water pipes), many valves, and complex control systems.

In addition, most of the current medical air-conditioning systems use fresh air centralized processing (dehumidification, temperature adjustment) and filtration, and circulating air is processed separately in each operating room, and the processing methods are divided into "primary return air" or "primary and secondary return air". "Primary return air" means that all the return air in the operating room is mixed with the required fresh air and enters the circulation unit for dehumidification, temperature adjustment and filtration; After entering the surface cooler of the circulation unit for dehumidification, it is mixed with the remaining return air and subjected to conditioning and filtering. The "primary return air" system is simple, but all the return air is dehumidified by the circulation unit and reaches the dew point temperature of the machine (usually lower than 16°C), so it needs to be heated to reach the supply air temperature, resulting in "cold" and "hot" balance , not only wasting cold energy but also consuming heat, which is not very energy-saving. The "primary and secondary return air" system can achieve energy-saving effects, but in order to achieve automatic control, automatic control valves and actuators need to be added, resulting in high failure rates and difficult debugging in practical applications, making it difficult to promote the system.

In addition, in the air circulation system, the fresh air and the treated return air need to be mixed thoroughly before being sent back to the room. If the mixing is uneven, it will directly affect the air quality of the output wind, for example, the oxygen content of the local output wind is low or the temperature is high. However, due to the treatment of dehumidification, temperature adjustment, humidification and purification, the fresh air often has a significantly higher pressure head (or wind pressure) and a correspondingly higher wind speed than the return air. When wind is mixing, it is difficult to achieve uniform mixing. However, if the two are mixed in advance in the front pipeline, firstly, a longer mixing pipeline is required, and secondly, the fresh air at the high pressure head will easily hinder the positive flow of the low-pressure head circulating air, and even cause the low-pressure head circulating air to flow backward, which is the so-called "Air blockage" phenomenon. Therefore, in the prior art, it is generally avoided to directly combine the conveying pipelines of fresh air and circulating air with large difference in transmission pressure heads, but to adjust their pressure heads first and then merge the two transmission pipelines, which also leads to significant Raised costs.

The technical trend of today's purification air conditioning system is to develop in the direction of energy saving, simple system, and convenient operation and maintenance.

Utility model content

Starting from the existing technology, the task of this utility model is to provide a low-noise modular air purification system, which can significantly reduce the postoperative infection rate, greatly reduce energy consumption, and at the same time significantly reduce the construction cost of the operating room, Construction period (highly integrated equipment and modular installation significantly reduce construction cost and complexity) and space requirements (no special machine room, less valves and no return air ducts), and can significantly reduce noise under the premise of ensuring sufficient air volume.

According to the invention, this task is solved by a low-noise modular air purification system comprising:

·Medical exhaust and fresh air integrated cabinet, including

A first cabinet having:

Used to introduce the exhaust air inlet to be exhausted;

Exhaust outlet for exhausting the air to be exhausted;

an exhaust air channel, which connects the exhaust air inlet with the exhaust air outlet for guiding the air to be exhausted;

an exhaust fan, which is arranged between the exhaust inlet and the exhaust outlet in the exhaust passage for guiding the air to be exhausted from the exhaust inlet to the exhaust outlet;

An exhaust air filter module, which is arranged before the exhaust fan for purifying and filtering the exhaust air;

A heat recovery device, which is arranged between the exhaust fan and the exhaust air outlet in the exhaust air passage, and the heat recovery device includes a plate heat exchanger for recovering waste heat or waste cold in the exhaust air;

a fresh air inlet for introducing fresh air, the fresh air inlet being in communication with the plate heat exchanger for absorbing waste heat or waste cold collected by the plate heat exchanger from the exhaust air;

A fresh air pretreatment device, which is arranged at the fresh air inlet for preprocessing the fresh air;

a first fresh air channel, which connects the fresh air inlet with the second cabinet for guiding fresh air from the fresh air inlet to the second cabinet;

a fresh air intake fan, which is arranged behind the heat recovery device in the fresh air flow direction in the first fresh air passage for introducing fresh air into the first cabinet; and

A preheater, which is arranged in the first fresh air channel before the fresh air inlet fan;

as well as

A second cabinet with:

Fresh air outlet, which is used to send out fresh air;

The second fresh air passage connects the first fresh air passage to the fresh air outlet for guiding the fresh air from the first cabinet to the fresh air outlet;

An air purification device, which includes a fresh air terminal filter device arranged at the fresh air outlet;

An indoor unit for air conditioning, which includes a dehumidifier, a heater and a humidifier arranged in the second fresh air passage;

Outdoor units for air conditioners, which include digital variable capacity direct expansion air-cooled units for supplying cooling to dehumidifiers; and

a fresh air outlet fan, which is used to discharge fresh air from the second cabinet through the fresh air outlet;

·Return air treatment air supply ceiling, the air supply ceiling is used to be installed on the top wall of the medical room and connected to the fresh air outlet of the medical exhaust and fresh air integrated cabinet through the fresh air pipe to introduce fresh air, the air supply ceiling has:

A plenum for mixing fresh and return air;

A directional air blower, which is arranged in the static pressure chamber and communicates with the fresh air duct, wherein the directional air blower has an air supply hole facing away from the circulating air processing device, so that the fresh air sent through the air supply hole is Bounced off the walls of the supply ceiling and mixed evenly with the return air to form circulating air; and

A circulating air treatment device, which has a housing for isolating the static pressure chamber, the circulating air treatment device has:

A plurality of fan filter units, whose circulating air inlet is connected with the static pressure chamber and whose circulating air outlet is aligned with the air supply ceiling filter layer, is used to introduce the circulating air mixed with return air and fresh air, and purify and filter the circulating air. The purified and filtered circulating air is transported to the direction of the air supply ceiling filter layer;

The air supply ceiling filter layer is used to purify and filter the circulating air output by the fan filter unit, so that the purified and filtered circulating air is input into the medical room in the form of weak turbulence; and

• The air return port, which communicates with the medical room and communicates with the static plenum through the return air duct for introducing the return air from the medical room into the static plenum of the air purification system.

The air purification system according to the utility model has at least the following advantages: (1) The air purification system has a high degree of integration. Purification and filtration, dehumidification/humidification, temperature adjustment and purification of exhaust air, while the return air treatment supply air ceiling integrates purification and filtration of return air, uniform mixing of fresh air and return air, and filtration and purification functions, and these two integrated The components can be implemented as finished products or semi-finished products that can be easily assembled on site, so the air system allows modular installation, which can be completed very quickly and conveniently, thus greatly simplifying the installation cost and shortening the construction time; ( 2) These two main components of the air purification system are compact finished products, so they do not require a dedicated machine room, but can be placed in a suitable location (such as in the dirt channel) according to the hospital conditions, and the pipeline between them can be The setting is quite short, especially the return air channel can be realized by using the channel, and since the return air processing function has been integrated in the return air treatment supply ceiling, there is no need to place a return air processor in the return air channel, and there is no need to place a return air processor in the return air channel. A special return air duct is set, so the air purification system has relatively low space requirements; (3) The air purification system of the present utility model realizes low noise while ensuring sufficient air volume, and ensures a comfortable and standard medical environment. The principle of noise suppression is based on the inventor's original discovery as follows: multiple fan filter units (Fan Filter Unit, FFU) are used in parallel to achieve sufficient air volume and ensure low noise. This is because the noise produced by multiple fan filter units is Additive noise, and it is difficult to select a suitable DC motor for a single fan filter unit used to realize the power (or ventilation capacity) of multiple fan filter units. At present, the maximum air volume of a single machine is 3000m ³ /h, and the actual air volume used It is 2000m ³ /h, and it is necessary to ensure that the total pressure of the fan is 210-290Pa, which makes the noise of the single machine relatively high, so the use of multiple fan filter units will greatly reduce the noise compared with the use of a single fan filter unit to achieve the same air volume; (4 ) Utilize this air purification system, can effectively reduce infection risk, this is because, according to inventor's research investigation, finds, the main reason that unidirectional flow ventilator causes high infection rate is that its air filter (such as HEPA, High Efficiency Particulate, high-efficiency filter) Although it can effectively trap microorganisms such as fungi and bacteria, in actual use, the filter itself becomes a hotbed for retaining and multiplying microorganisms, and because the air outlet direction of unidirectional flow air supply equipment is generally fixed Align the operating table so that it is easy to directly blow the bacteria in the filter layer to the operating table, such as the surgical operation site, through the one-way airflow, thereby causing postoperative infection; and the air purification system in this application uses weak turbulence technology, due to the weak The direction of turbulence is random, so even if the air outlet direction of the air supply device is aligned with the operating table, the bacteria in the filter layer will be blown directly to the operating table. The probability of the operating table will also be greatly reduced, thereby effectively reducing the risk of postoperative infection; (5) the use of this air purification system can greatly save electric energy, because, according to the unique insight of the inventor, only the fresh air needs to be cleaned. A complete dehumidification, temperature adjustment and purification treatment, and only purification treatment for the return air, can already maintain the air quality of the medical room at an ideal level, because of the increased heat and humidity load (including latent heat and Sensible heat) can be offset by simply increasing the fresh air volume by a small amount (for example, increasing 150-200m ³ /h), without dehumidification and temperature adjustment of the return air; The electric energy for dehumidification and temperature adjustment, and because the dehumidification process is all transferred to the fresh air processing device of the fresh air exhaust integrated cabinet instead of performing the dehumidification function in the return air processor, it also avoids the "cold and hot offset" in the primary return air. In addition, using a brushless DC fan with adjustable speed can save 30% of electric energy compared with using an AC fan, and compared with an AC motor that adjusts the air volume through frequency conversion and stepping, by adjusting the DC motor The speed can adjust the air volume steplessly, the system is simple, easy to use and saves investment; (6) Utilizing the air purification system according to the utility model can realize the uniform mixing of fresh air and return air with different wind pressures and thus different wind speeds, It is based on the principle that the fresh air with high wind pressure and speed is transmitted for a certain distance in the direction away from the circulating air treatment device and after being rebounded by the wall, its wind pressure and wind speed have weakened to an appropriate level. The return air mixing can easily achieve a relatively uniform mixing, and then the circulating air formed by the uniform mixing of the fresh air and the returning air is input into the circulating air processing device, and can be directly output to the medical room after being filtered; the utility model The advanced air purification system does not require special valves, actuators, and complicated control processes. Its control process is simple, low in cost, and has a good mixing effect.

Here, it should be pointed out that the weak turbulence (also known as low turbulence) used in the present invention refers to the degree of turbulence of the airflow (or the degree of turbulence, that is, the measure of the fluctuation of the airflow velocity relative to the average value, that is, the relative standard poor) from 5% to 20%. In addition, turbulent flow <5% is unidirectional flow or laminar flow, and turbulent flow >20% is turbulent flow or turbulent flow (see German standard: DIN1946-4:2008).

In a preferred solution of the present invention, it is stipulated that the plurality of fan filter units are four fan filter units, and the noise value of each fan filter unit is selected to be less than or equal to 45dB. Through this preferred solution, the air volume requirements of the Class I operating room can be better met while satisfying its noise requirements (≤51dB).

In a development of the present invention, it is provided that the filter devices of the plurality of fan filter units include a fan, a motor and a sound-absorbing volute. Through this expansion scheme, the noise of fans, electrodes, and airflow in the circulating air can be greatly reduced, and then the ceiling filter layer, such as HEPA high-efficiency filter, can be filtered twice to achieve a very high purification and filtration effect.

In a preferred solution of the present invention, it is stipulated that a porous muffler plate is arranged on the wall of the static pressure chamber, and a muffler is arranged on the fresh air duct. Through this preferred solution, the noise of the air purification system can be further reduced, thereby creating a more comfortable medical environment.

In another preferred solution of the present invention, it is stipulated that an enclosure is arranged at the lower end of the return air treatment air supply ceiling for guiding the airflow output from the return air treatment air supply ceiling. The enclosure preferably has a height of 450 mm. Through this preferred solution, the purified air can be delivered to the working surface of the operating table at a relatively low wind speed, for example, 0.24m/s.

In yet another preferred solution of the present utility model, it is stipulated that the low-noise modular air purification system includes two return air paths, each return air path includes a plurality of return air ports, and the return air ports are arranged on the operating table in parallel On both sides, each return air path supplies 50% of the return air volume respectively, wherein the return air velocity of the return air outlet is controlled to be less than or equal to 1m/s. Through this preferred solution, two return air outlets can be arranged using the two return air ducts that are usually provided in existing operating rooms, so that compared with a single return air outlet, the speed of the return air can be reduced, thereby reducing noise.

In an extension of the present invention, the medical room includes: an operating room, a general ward, a neonatal ward, a central supply room, and an ICU ward. With this extension, the ideal air cleanliness for a wide variety of medical rooms can be achieved. Other medical rooms or rooms requiring similar air cleanliness are also conceivable.

In another extension of the present invention, the first cabinet further includes a chemical filter module arranged between the fresh air inlet and the fresh air inlet fan for chemically filtering the fresh air, wherein the chemical filter module includes a effective filter layer. In addition, the fresh air pretreatment device arranged at the fresh air inlet may also include a coarse-effect filter layer and a medium-effect filter layer. Through this extension scheme, the large particles of 2.5 μm and 10 μm in the air can be filtered first and the concentration of chemical pollutants (such as NO _x , SO _x , NH ₃ and TVOC) can be reduced, thereby promoting the subsequent fine filtration of fresh air. The chemical filtration module is, for example, a cylindrical structure filled with activated carbon fillers of various formulas.

In a preferred solution of the present utility model, it is stipulated that the thickness of the air-supply ceiling filter layer and/or the pitch of the filter paper folding of the air-supply ceiling filter layer are adjusted and the air supply speed is changed so that the input fresh air and return air are A weak turbulent form enters the medical room. Through this preferred solution, a more uniform and stable weak turbulent flow can be formed at low cost. This is because, although the ceiling filter layer adopted in the utility model has the effect of making the circulating wind a weak turbulent flow due to the random orientation of the filter holes in its filter material (such as filter paper), but by adjusting the air supply ceiling The thickness of the filter layer and/or the pitch of the filter paper folds of the ventilation ceiling filter layer can make the resulting low turbulent flow more stable and uniform, thereby further reducing the risk of infection.

In a further preferred embodiment of the invention it is provided that the fresh air fan and/or the fan filter unit and/or the exhaust fan are equipped with a brushless DC motor, wherein the rotational speed of the brushless DC motor can be adjusted steplessly. Through this preferred solution, the energy-saving effect of the brushless DC motor can be realized and the free adjustment of the fresh air volume, return air volume and exhaust air volume can be realized.

In yet another preferred solution of the present utility model, it is stipulated that the air purification system is configured to adjust the rotation speed of the fresh air fan and the brushless DC motor of the fan filter unit according to the cleanliness requirements of the medical room. Through this preferred solution, different cleanliness levels can be achieved, that is, switching between medical rooms with different purposes (such as different operating room levels), so as to meet the cleanliness requirements of different medical rooms.

In another preferred solution of the present utility model, it is stipulated that the medical room is an operating room, and the air purification system also includes an operating room real-time detection system, and the operating room real-time detection system includes a temperature detector, a humidity detector, An anemometer, a pressure difference detector, and a particle detector, and the air purification system is configured to adjust the fresh air fan and/or return air according to the detected temperature, humidity, wind speed, pressure difference value, and particle concentration The speed of the brushless DC fan of the fan and/or exhaust fan, the life of the filter layer, the air volume and cleanliness, and the cooling capacity of the digital variable capacity direct expansion air-cooled unit. Through this preferred solution, the air parameters in the operating room can be dynamically and automatically maintained within the range meeting the cleanliness level requirements of the corresponding operating room and the air-conditioning parameters can be maintained.

In another preferred solution of the present utility model, it is stipulated that gravity self-locking dampers are respectively arranged in the fresh air inlet and exhaust outlet of the medical exhaust and fresh air integrated cabinet, and the gravity self-locking dampers have:

Air plate, the size of which matches the air outlet;

A turning axis, which passes through the wind plate so that the wind plate can turn around the turning axis;

a counterweight, which is arranged at one end of the wind plate, so that the wind plate remains vertical without external force to close the tuyere; and

A stopper is arranged on the top and/or bottom of the air outlet to prevent the wind panel from deflecting in reverse.

Through this preferred solution, each air door can be automatically closed without introducing fresh air or discharging air to be exhausted, thereby effectively preventing pollutants or foreign matter from entering the air duct through the air door to cause pollution or blockage. On the other hand, the stop prevents a reverse deflection of the wind vane.

In addition, the aforementioned tasks of the present invention can also be achieved by an operating room having a low-noise modular air purification system according to the present invention. Through this operating room, the advantages of the air purification system according to the present invention can also be realized, that is, significantly reducing the postoperative infection rate, greatly reducing energy consumption, and at the same time significantly reducing the construction cost and construction period of the operating room (highly integrated equipment and Modular installation significantly reduces construction cost and complexity) and space requirements (no special machine room, less valves and no return air ducts), and it can also significantly reduce noise while ensuring sufficient air volume.

Description of drawings

The utility model will be further elaborated below with reference to specific embodiments in conjunction with the accompanying drawings.

Fig. 1 shows the schematic diagram according to the low-noise modular air cleaning system of the present utility model;

Fig. 2A shows the internal structure diagram of the medical exhaust and fresh air integrated cabinet according to the utility model;

Figure 2B shows a view of the heat recovery device from the direction A of Figure 2A; and

Fig. 3 shows a schematic diagram of the gravity self-locking damper according to the present invention.

Fig. 4 shows a schematic diagram of the operating room real-time detection system of the air purification system according to the present invention.

detailed description

FIG. 1 shows a schematic diagram of a low-noise modular air purification system 100 according to the present invention. It should be noted that components in the various figures may be shown exaggerated for the purpose of illustration and are not necessarily true to scale. In the various figures, identical or functionally identical components are assigned the same reference symbols.

As shown in Figure 1, the air purification system 100 is a highly integrated, modular structure, which mainly includes two modules: medical exhaust and fresh air integrated cabinet 200 (including its digital variable capacity direct expansion air cooling unit 111), return air Handle air supply ceiling 103.

The medical exhaust and fresh air integrated cabinet 200 is preferably arranged in the dirt channel 113 of the medical room. Due to its compact shape, it can be arranged in the corner of the dirt channel 113 without affecting normal traffic, thereby saving the need for arranging air purification. The traditional dedicated computer room for the system. However, other arrangements are also conceivable. The medical exhaust and fresh air integrated cabinet 200 is configured to introduce fresh air from the fresh air inlet 214 (see FIG. 2A ) and deliver the purified, filtered, temperature-regulated, and humidity-regulated fresh air to the Air return handles air supply ceiling 103. The medical exhaust and fresh air integrated cabinet 200 is also configured to filter and recover heat from the exhaust air introduced into the exhaust inlet 203 of the integrated cabinet 200 from the exhaust outlet 116 through the exhaust duct 102 and exhaust it to the outside through the exhaust outlet 216 . In addition, FIG. 1 also shows an outdoor unit used in conjunction with the medical exhaust and fresh air integrated cabinet 200 , that is, a digital variable capacity direct expansion air-cooled unit 111 , which is used to supply cooling to the dehumidifier 209 . For further structural and functional details of the medical exhaust and fresh air integrated cabinet 200, please refer to FIG. 2A and FIG. 2B and their corresponding descriptions, and details will not be repeated here.

The return air treatment air supply ceiling 103 is installed on the top wall of the medical room and is connected with the fresh air outlet 218 of the medical exhaust and fresh air integrated cabinet 200 through the fresh air duct 101 for introducing fresh air. It should be noted that the air return treatment air supply ceiling 103 can be embedded in the upper technical mezzanine of the medical room, and can also be installed on the ceiling of the medical room as a conventional air supply ceiling. The air supply ceiling 103 has a static pressure chamber 114, which is used to uniformly mix the fresh air introduced through the fresh air duct 101 and the return air introduced from the return air outlet 110 through the return air passage 112 to form a circulating air (in this application, Circulating air refers to the mixture of fresh air and return air). The static pressure chamber 114 , also known as the static pressure space, is, for example, a cavity with a certain geometric shape, such as a cuboid, and its shape and size should be sufficient to fully and uniformly mix the fresh air and return air. The air supply ceiling 103 also has a directional air blower 105 arranged in the static pressure chamber 114 , and the directional air blower 105 communicates with the fresh air duct 101 . In this embodiment, the directional air blower 105 is configured as a pipe, but in other embodiments, it can also be configured in other forms, such as a perforated air plate, a perforated annular pipe, and the like. The directional air blower 105 has an air supply hole (not shown) arranged away from the circulating air processing device 117, so that the fresh air (shown by an upward arrow in FIG. 1 ) sent through the air supply hole can be returned After the wall (for example, the top) of the air-supply ceiling 103 rebounds, it is evenly mixed with the return air to form a stable and uniform circulating air. The existence of the directional air blower 105 makes it possible to mix the fresh air and the return air more fully and evenly without significantly increasing the space of the static pressure chamber 114, thereby eliminating the need for fresh air with different wind pressures in traditional air purification equipment. The high cost and complex valve system and its actuator used for the uniform mixing of air and return air.

Return air treatment The air supply ceiling 103 also includes a circulating air treatment device 117, which has a housing for isolation from the static pressure chamber 114, so as to prevent the return air that has not been purified and filtered by the fan filter unit 104 from directly passing through the air supply ceiling filter layer 106 It is input into the medical room and affects the effect of return air purification and filtration. The circulating air treatment device 117 has a plurality (for example four, only two fan filter units 104 are shown in FIG. 1 for clarity; but other numbers of fan filter units 104 are also conceivable) fan filter units 104, Its circulating air inlet 110 communicates with the static pressure chamber 114 and its circulating air outlet 108 is aligned with the air supply ceiling filter layer 106 for introducing circulating air that is uniformly mixed with returning air and fresh air and purifying and filtering the circulating air and passing it through The purified and filtered circulating air is transported to the direction of the air supply ceiling filter layer. It should be noted that the fan filter unit 104 is a modified fan filter unit, which includes a fan 107 and a sound-absorbing volute (not provided with reference numerals, see the line segment in the fan filter unit 104), wherein the fan filter unit 104 can be A filter layer is not included, but the filter function is moved to the plenum filter layer 106 . After the modification described, ie by removing the filter layer and adding the sound-absorbing volute, the noise can be reduced by 2-3dB(A). The structure of the noise-absorbing volute can be, for example, coating "noise-absorbing cotton" (non-dust-producing type) on the deflector, and the deflector is installed in the noise-absorbing volute.

In the present utility model, through experimental testing, the sound pressure level value-added table after the noise sources are superimposed is shown in Table 1, and the noise values of four fan filter units (Fan Filter Unit, FFU) 104 with noises of 45dB (A) are used in parallel See Table 2:

Table 1: Sound pressure level value-added table when noise sources are superimposed

Table 2: Environmental noise table when 1-4 FFUs are running at the same time

It can be known from the above table that according to the utility model, one to four FFUs with a stand-alone noise of 45dB(A) can be operated at the same time, and the noise can be controlled at 45 to 51dB(A), thereby meeting the cleanliness and ventilation requirements of different operating rooms At the same time, the noise requirements are met. This is because the noise generated by multiple fan filter units FFU is additive noise (see Table 1 for the noise when running different numbers of fans), and the single fan used to realize the power (or ventilation capacity) of multiple fan filter units The noise of the filter unit will be much higher than the sum of the noise of multiple fan filter units, for example, 5-10 decibels or more, so the use of multiple fan filter units will be greatly reduced compared with the use of a single fan filter unit to achieve the same air volume noise. In addition, in order to further eliminate noise, a porous muffler plate may be provided on the wall of the static pressure chamber 114 , and a muffler 115 may be arranged on the fresh air duct 101 . The sound-absorbing board and the muffler can be made of low-density sound-absorbing materials such as foam, cork, and rubber, or high-density sound-insulating materials such as metal plates. In addition, a muffler may also be arranged on the pipeline behind the fresh air outlet 218 of the integrated cabinet 200 as a supplementary means for noise reduction.

The fan filter unit 104 includes a fan and a sound-absorbing volute (not equipped with reference numerals). Through this expansion scheme, the noise of the fan, motor, and airflow in the circulating air can be greatly reduced, and then pass through the ceiling filter layer 106, such as HEPA high-efficiency filter. The secondary filtration of the net can achieve a very high purification and filtration effect.

Air return treatment The air supply ceiling 103 also includes an air supply ceiling filter layer 106, which is used to purify and filter the circulating air output by the fan filter unit 104, so that the purified and filtered circulating air is input into the medical room in the form of weak turbulence middle. The ceiling filter layer 106 preferably also uses a HEPA filter. In addition, an enclosure 118 is preferably arranged at the lower end of the return air treatment air supply ceiling 103 for guiding the airflow output by the air supply ceiling 103 . The enclosure preferably has a height of 450 mm. Through this preferred solution, the purified air can be delivered to the working surface of the operating table, which is, for example, 1200 mm from the ground at a relatively low wind speed, for example, 0.24 m/s. The enclosure 118 may be made of a transparent glass plate or a resin material.

The air purification system 100 also includes a return air outlet 110, which is a plurality of return air outlets and is equipped with a medium-efficiency filter layer F7/F9. It is introduced into the static pressure chamber 114 of the air cleaning system 100 from the medical room. In the air purification system of the present utility model, there is no need to use the return air duct, but the return air is transported to the static pressure chamber 114 through the return air channel 112, and most of the current operating rooms are equipped with a return air duct. Therefore, the existing return air passage is directly used to transport the return air, which will save the cost of laying the return air duct. Moreover, there is no need to arrange a return air processor in the return air passage 112 , but the return air processing function has been completely transferred to the circulating air processing device 117 . This greatly simplifies the installation process of the air purification system 100 and reduces space requirements.

Here, for example, the grade of the operating room can be changed by changing the speed of the brushless DC motor of the fresh air fan (comprising the fresh air inlet fan 208 and the fresh air outlet fan 213 of the integrated cabinet 200) to adjust the fresh air volume (1200m ³ / h, 1000m ³ /h, 800m ³ /h), and at the same time match the cooling capacity of the air conditioner outdoor unit (digital variable capacity direct expansion air-cooled unit 111) matched with the fresh air fan; the air supply of the air supply ceiling 103 Speed (0.24-0.3m/s for class I operating room, air volume 8000-10000m ³ /h) and/or control the minimum number of air changes in operating room (24 times/h for class II, 18 times/h for class III, 12 times/h for class IV times/h), in fact, by changing the model of the fan filter unit 104 or the speed of the fan to meet the different cleanliness requirements of different levels of operating rooms. At the same time, adjust the temperature and humidity of the air-conditioning system in the operating room.

The air flow direction in the low-noise modular air cleaning system 100 is described below.

Regarding the fresh air: First, the fresh air is introduced from the fresh air inlet 214 of the medical exhaust and fresh air integrated cabinet 200 and is transported to the return air supply ceiling 103 through the fresh air duct 101 after being purified, filtered, and adjusted for temperature and humidity. In the air-supply ceiling 103, the fresh air is transported into the static pressure chamber 114 by the directional air blower 105 in the direction away from the circulating air processing device 117, and bounces off the wall of the air-supply ceiling 103 in the static pressure chamber. 117 is fully and evenly mixed with the return air introduced from the return air passage 112, and then the uniformly mixed circulating air is input into the circulating air processing device 117 under the action of the fan filter unit 104, and the purification of the fan filter unit 104 After filtering, the circulating air is transported toward the air-supply ceiling filter layer 106, and finally enters the medical room in the form of weak turbulent flow after being purified and filtered by the air-supply ceiling filter layer 106. As can be seen from FIG. 1, the purified air flow or circulating wind (represented by reference numeral 112) is blown to the vicinity of the operating table 109 in a random and disordered direction, so due to the randomness of the direction of the weak turbulence, therefore Even if the air outlet direction of the air supply ceiling 103 is aligned with the operating table 109, the probability of directly blowing bacteria in the filter layer to the operating table 109, especially the surgical site, will be greatly reduced, thereby effectively reducing the risk of postoperative infection.

Regarding the return air: the air in the medical room enters the return air passage 112 through the return air outlet 110 (with a medium-efficiency filter layer F7/F9 inside), and enters the static pressure chamber 114 of the air return ceiling 103 through the return air passage 112, Fully and evenly mix with the fresh air in the static pressure chamber 114, and enter the medical room in the form of weak turbulence after being filtered by the fan filter unit 104 of the circulating air treatment device 117 and the filter layer 106 of the air supply ceiling.

Regarding the exhaust air: the exhaust air enters the exhaust and fresh air integrated cabinet 200 through the exhaust outlet 116 through the exhaust duct 102, and is discharged to the outside after being filtered and heat recovered there. The ventilation function is used, for example, for the rapid evacuation of medical gases such as anesthetics in the operating room, or for rapid air changes.

The air purification system 100 according to the present utility model has at least the following advantages: (1) The air purification system 100 has a high degree of integration, and its main components are a medical exhaust and fresh air integrated cabinet 200 and a return air treatment air supply ceiling 103, which are integrated The cabinet 200 integrates fresh air purification and filtration, dehumidification/humidification, temperature adjustment and exhaust air purification functions, while the return air treatment supply air ceiling integrates the uniform mixing and filtration and purification functions of fresh air and return air, and these two integrated components are It can be implemented as a finished product or a semi-finished product that can be easily assembled on site, so the air system 100 allows modular installation, and such modular installation can be completed very quickly and conveniently, thereby greatly simplifying the installation cost and shortening the construction time; (2 ) These two main components of the air purification system 100 are compact finished products, so they do not require a dedicated machine room, but can be placed in a suitable location (such as in the dirt channel) according to hospital conditions, and the pipeline between them can be It is set to be quite short, especially the return air channel can be realized by using the channel 112, and since the return air processing function has been integrated in the return air processing air supply ceiling 103, there is no need to place a return air processor in the return air channel, and there is no need to A special return air duct is set in it, so the air purification system has relatively low requirements for space; (3) The air purification system 100 of the present utility model realizes low noise while ensuring sufficient air volume, ensuring comfortable and standard medical treatment Environment, the principle of its noise suppression is based on the inventor's original discovery as follows: multiple fan filter units (Fan Filter Unit, FFU) 104 are used in parallel, which can achieve sufficient air volume and ensure low noise, because multiple fan filter units 104 The generated noise is additive noise (see Table 1 for specific noise values), and it is difficult to select a suitable DC motor for a single fan filter unit used to realize the power (or ventilation capacity) of multiple fan filter units 104. The maximum air volume of a single machine is 3000m ³ /h, the actual air volume used is 2000m ³ /h, and the total pressure of the fan must be guaranteed to be 210-290Pa, which makes the noise of the single machine relatively high, so multiple fan filter units are used to achieve the same air volume Compared with a single fan filter unit, the noise will be greatly reduced, and multiple fans used in parallel can achieve a large air volume and run at a low speed, which may sacrifice the efficiency of the fan, but greatly reduce the noise; (4) use the air The purification system 100 can effectively reduce the risk of infection. This is because, according to the inventor's research investigation, it is found that the main reason for the high infection rate caused by the unidirectional flow ventilation equipment is that its air filter (such as HEPA, HighEfficiency Particulate, high-efficiency filtration Although it can effectively trap microorganisms such as fungi and bacteria, in actual use, the filter itself becomes a breeding ground for retaining and multiplying microorganisms, and because the air outlet direction of the unidirectional flow air supply device is generally fixedly aligned with the operation stage, making it easy to remove bacteria from the filter layer by unidirectional airflow Blow directly to the operating table, such as the surgical operation site, causing postoperative infection; and the air purification system in this application uses weak turbulence technology. Due to the randomness of the direction of weak turbulence, even if the air outlet direction of the air supply Operating table, the probability of directly blowing the bacteria in the filter layer to the operating table will also be greatly reduced, thereby effectively reducing the risk of postoperative infection; (5) using the air purification system 100 can greatly save electric energy, because, According to the inventor's unique insights, it is only necessary to carry out complete dehumidification, temperature adjustment and purification treatment on the fresh air, and only need to perform purification treatment on the return air, and the air quality of the medical room can be maintained at an ideal level, because due to The increased heat and humidity load (including latent heat and sensible heat) caused by indoor personnel work can be offset by simply increasing the fresh air volume by a small amount (for example, increasing 150-200m ³ /h), without dehumidification and temperature adjustment of the return air; In this way, not only the electric energy used for dehumidification and temperature adjustment of the return air is saved, but also because the dehumidification process is all transferred to the fresh air processing device of the fresh air exhaust integrated cabinet 200 without performing the dehumidification function in the return air processor, It also avoids the disadvantage of "cold and hot balance" in the primary return air, and improves the temperature control efficiency; in addition, the use of brushless DC fans with adjustable speed can save 30% of electric energy compared with the use of AC fans, and compared with the use of frequency conversion Compared with the AC motor with gears to adjust the air volume, the air volume can be adjusted steplessly by adjusting the rotating speed of the DC motor. The system is simple, easy to use and saves investment; (6) Utilizing the air purification system 100 according to the utility model can realize wind pressure The uniform mixing of fresh air and return air with different wind speeds is based on the principle that the fresh air with higher wind pressure and wind speed is transported for a certain distance in the direction away from the circulating air treatment device and bounced off the wall. Its wind pressure and wind speed have been weakened to a suitable level, and at this time it is mixed with the return air, which can easily achieve a relatively uniform mixing, and then the circulating air formed by the uniform mixing of the fresh air and the return air is input to the circulating air processing device 117 After being filtered, it can be directly output to the medical room; the air purification system 100 of the utility model does not need special valves, actuators and complicated control procedures, and its control procedures are simple, low in cost and good in mixing effect.

Fig. 2A shows an internal structure diagram of a medical exhaust and fresh air integrated cabinet 200 according to the present invention.

As shown in FIG. 2A , the medical exhaust and fresh air integrated cabinet 200 includes a first cabinet 201 and a second cabinet 202 . The first cabinet 201 and the second cabinet 202 can be integrally formed, or formed separately and then assembled.

The first cabinet 201 has an exhaust air inlet 203 for introducing air to be exhausted and an exhaust air outlet 216 for exhausting air to be exhausted. The first cabinet 201 also has an exhaust channel (not shown), which connects the exhaust inlet 203 with the exhaust outlet 216 for guiding the air to be exhausted, wherein the exhaust channel can be a special pipeline or can be formed by The walls of the first cabinet 201 are enclosed. The first cabinet 201 also has an exhaust fan 204 arranged between the exhaust inlet 203 and the exhaust outlet 216 in the exhaust passage for guiding the air to be exhausted from the exhaust inlet 203 to the exhaust outlet 216 . The exhaust fan 204 is preferably equipped with a brushless DC motor whose speed can be adjusted steplessly, so that the exhaust air volume can be adjusted by adjusting the fan speed, thereby adjusting the air pressure in the medical room to achieve the desired pressure difference effect. The first cabinet 201 also has an exhaust air filter module 220, which is arranged before the exhaust fan 204 in the exhaust passage to purify and filter the exhaust air before it is discharged to the outside, so as to filter out the exhaust air in the air to be exhausted. micro-organisms to avoid direct discharge into the environment.

The first cabinet 201 also has a heat recovery device 206 arranged between the exhaust fan 204 and the exhaust outlet 216 in the exhaust passage. The heat recovery device 206 includes a plate heat exchanger (or honeycomb heat exchanger) for recovering waste heat or waste cold in the exhaust air. The plate heat exchanger includes, for example, a plurality of heat exchange plates 217 arranged perpendicular to each other, so that the air to be exhausted can flow perpendicular to the fresh air direction (see the single arrow in FIG. 1 ) and transfer waste heat or waste cold through the heat exchange plates 217 Give fresh air. The heat exchange plate 117 is made, for example, of a very thin copper plate, but other materials with good thermal conductivity are also conceivable. Further details of the heat recovery device 106 can be referred to FIG. 2B .

The first cabinet 201 also has a fresh air inlet 214 for introducing fresh air, and the fresh air inlet 214 communicates with the heat exchange plate 217 for introducing fresh air into the heat exchange plate 217 . The first cabinet 201 also has a first fresh air channel (not shown), which connects the fresh air inlet with the second cabinet 202 for guiding fresh air from the fresh air inlet 214 to the second cabinet 202 . The first fresh air passage can be a dedicated duct, or can be surrounded by walls of the first cabinet. The first cabinet 201 also has a fresh air intake fan 208 , which is arranged behind the heat recovery device 206 in the first fresh air channel in the fresh air flow direction (see arrow in FIG. 1 ) for introducing fresh air into the first cabinet 201 .

The first cabinet 201 also has a fresh air pretreatment device 205 arranged at the fresh air inlet 214 for pretreating the fresh air. The fresh air pretreatment device 205 includes a coarse filter and a medium filter layer for filtering out large particles in the air.

The first cabinet 201 also has an optional chemical filter module 207 arranged between the fresh air inlet 214 and the fresh air inlet fan 208 for chemically filtering the fresh air. Through the chemical filtration module 207, the concentration of chemical pollutants (such as NO _x , SO _x , NH ₃ and TVOC) can be reduced, thereby promoting subsequent fine filtration of fresh air. The chemical filtration module 207 is, for example, a cylindrical structure, containing various formula activated carbon fillers.

The first cabinet 201 also has a preheater 212 , which is arranged before the fresh air intake fan 208 in the first fresh air channel, for example, between the chemical filter module 207 and the fresh air fan 208 . The preheater 212 is used to preheat the fresh air in winter for subsequent heating, so as to complete the "isothermal humidification" function.

Also shown in FIG. 2A is a second cabinet 202 . The second cabinet 202 has a second fresh air channel, which connects the first fresh air channel with the fresh air outlet 218 for guiding fresh air from the first cabinet 201 to the fresh air outlet 218 . In FIG. 2A , the first fresh air channel 201 in the first cabinet communicates with the second fresh air channel in the second cabinet 202 through a connecting channel 221 for delivering fresh air. The second cabinet 202 has an air purification device, which includes a fresh air terminal filter device 219 arranged at the fresh air outlet, and the fresh air terminal filter device 219 is used for secondary purification and filtration of the fresh air.

The second cabinet 202 also has an indoor unit for air conditioning, which includes a dehumidifier 209, a heater 210, and a humidifier 211 arranged in the second fresh air passage, wherein the dehumidifier 209 is, for example, a Freon direct evaporative surface cooler (or a meter). Cooler), which is used for deep dehumidification of fresh air. The heater 210 is used for heating the dehumidified lower temperature air to a suitable temperature to ensure that the air supply does not condense, or heating before humidification in winter. The heater 210 is, for example, an electric heating wire. The humidifier 211 is, for example, an electrode-type humidifier for humidifying fresh air.

The second cabinet 202 also has an outdoor air conditioner for supplying cold source, which includes a digital variable capacity direct expansion air-cooled unit 111 (see FIG. 1 ) for supplying cooling to the dehumidifier.

The fresh air end filter device 219 may optionally have a filter element (not shown) for filtering particles with a diameter of 0.1 m to 0.5 m. The feature of the digital variable capacity direct expansion air-cooled unit is that during dehumidification, the refrigerant directly evaporates and exchanges heat with the fresh air to complete the dehumidification function, and the cooling capacity can be adjusted in a large range. The system is simple and the effect is good.

The second cabinet 202 also includes a fresh air outlet fan 213 for discharging fresh air from the second cabinet 102 . The air intake direction of the fresh air outlet fan 213 can be either perpendicular to the flow direction of the fresh air or parallel to the flow direction of the fresh air. Finally, the second cabinet 202 also includes a fresh air outlet 218 for discharging fresh air.

The fresh air inlet 214 and exhaust air outlet 216 of the first cabinet 201 can optionally have gravity self-locking dampers 215 respectively, so that the automatic closing of each damper 214 and 216 can be realized when no fresh air is introduced or exhausted air is discharged. Thus effectively preventing pollutants or foreign matter from entering the air duct through the dampers 214 and 216 to cause pollution or blockage. Further details of the gravity lock damper 215 are set forth in FIG. 2B.

In addition, the fresh air inlet fan 208 and the fresh air outlet fan 213 are equipped with brushless DC motors with adjustable speed. In this way, energy saving can be realized on the one hand, because using a brushless DC motor can save 30% of electric energy compared with using an AC fan. On the other hand, by using a motor with adjustable speed, the adjustment of the fresh air volume can be realized to adapt to different types of operating rooms (Class I, Class II, Class III and Class IV), and realize one machine with multiple functions. The power of a single fan is, for example, 150-300W, and its power varies by about 10% as the air volume changes. In addition, it is also feasible to sacrifice part of the energy-saving effect to reduce the number of models. Compared with step-by-step variable speed regulation of AC motor, the system of stepless speed regulation is much simpler, thus reducing the control cost. For changes in cleanliness, the return air volume can be adjusted accordingly (change the speed of the return air fan).

In the integrated cabinet 200, the fresh air volume of various operating rooms can be 1200m ³ /h, 1000m ³ /h, 800m ³ /h, for example, and the fresh air can eliminate sensible heat in various operating rooms after cooling and dehumidification ability. Appropriately increasing the fresh air volume after deep dehumidification can completely eliminate the heat and humidity load (including sensible heat and latent heat) in various operating rooms. Therefore, the "air-conditioning function" and "purification function" of the "purifying air-conditioning" system in the operating room can be implemented separately, so as to fundamentally avoid the disadvantages of "cold" and "hot" in the purifying air-conditioning system. Moreover, the integrated cabinet can greatly simplify the purification and air-conditioning system of the operating room, reduce the number of valves, and reduce the difficulty of automatic control. It is easy to operate, easy to maintain, and has a good energy-saving effect.

In addition, in this integrated cabinet, the fresh air inlet fan 208 and the fresh air outlet fan 213 are used in parallel to realize the superimposition of fan pressure heads, so as to solve the technical bottleneck of the multi-functional section requiring high pressure heads in the integrated cabinet. In addition, considering the noise when the fans are used in parallel, a muffler 106 is provided in or on the fresh air duct 101 .

Deep dehumidification belongs to low-temperature air supply. In addition to a slight reheating measure, the temperature rise of the circulating air fan can reduce the risk of "supply air condensation".

In addition, the exhaust fan 204 , the fresh air inlet fan 208 and the fresh air outlet fan 213 may be respectively arranged in an anechoic chamber (not shown). The anechoic cavities are respectively located in the exhaust air channel, the first fresh air channel and the second fresh air channel, and are used to silence the fan. The anechoic cavity can be made of low-density sound-absorbing materials such as foam, cork, rubber, etc., or high-density sound-insulating materials such as metal plates. In addition, a muffler may also be arranged on the pipeline behind the fresh air outlet 218 as a supplementary means for noise reduction.

The flow process of the air to be exhausted and the fresh air in the medical exhaust and fresh air integrated cabinet 200 will be respectively described below.

The flow process of the air to be exhausted is as follows: First, the air to be exhausted enters the exhaust channel of the first cabinet 201 under the action of the exhaust fan 204, and after being purified and filtered by the exhaust air filter module 220, passes through the heat recovery device 206 and puts The waste cold or waste heat is transferred to the heat exchange plate 217, and the heat exchange plate 217 further transfers the waste cold or waste heat to the fresh air conveyed in the heat exchange plate 217;

The flow process of the fresh air is as follows: First, the fresh air enters the first fresh air channel of the first cabinet 201 from the fresh air inlet 214 of the first cabinet 201 under the action of the fresh air inlet fan 208, and after being purified and filtered by the fresh air pretreatment device 205 Enter the heat recovery device 206 and absorb the waste heat or waste cold from the air to be exhausted and heat up or cool down; then, the fresh air passes through the optional chemical filter module 207 to undergo preliminary purification and filtration; the fresh air after the preliminary purification and filtration passes through the preheater After the preheating of 212, it leaves the first cabinet 201 and enters the second fresh air channel of the second cabinet through the channel 221. In the second cabinet 202, the fresh air undergoes the deep dehumidification of the dehumidifier 209, the heating of the heater 210 and the humidifier respectively. After the humidification at 211 and the purification and filtration by the fresh air terminal filter device 219 , it leaves the second cabinet 202 through the fresh air outlet 218 under the action of the fresh air outlet fan 213 .

FIG. 2B shows a view of the heat recovery device 206 from the direction A of FIG. 2A . In Fig. 2B, the flow direction of the air to be exhausted is indicated by arrows, and the flow direction of fresh air is indicated by crossed lines. It can be seen from FIG. 2B that the heat recovery device 206 includes a plurality of heat exchange plates 217, and the heat exchange plates 217 are, for example, arranged perpendicular to each other to form passages for exhaust air and fresh air to pass through, and the two passages are not connected to each other. To prevent undesired mixing of fresh air and exhaust air. The heat exchange plate 217 is used to collect the waste heat or waste cold of the exhaust air (see the arrow in FIG. 2B ) passing through the heat exchange plate 217, and transfer the waste heat or waste cold to the fresh air ( See crossed lines in Figure 2B). Through the heat recovery device 206, the waste heat or waste cold to be exhausted can be reused, so as to realize the energy saving effect. The heat exchange plate 217 can be, for example, an extremely thin copper plate, but heat exchange plates 217 made of other heat-conducting materials are also conceivable.

FIG. 3 shows a schematic diagram of the gravity self-locking damper 215 according to the present invention. As shown in FIG. 2A , the gravity self-locking damper 215 is arranged, for example, in the fresh air inlet 214 , but it is also conceivable to arrange the gravity self-locking damper 215 in the exhaust air outlet 216 .

The gravity self-locking damper 215 includes a wind plate 301 whose size matches the tuyere. For example, the size of the wind plate 301 is determined so that when the wind plate 301 is vertical, it can just cover the air opening, that is, the fresh air inlet 214, so as to achieve a sealing effect. The damper can be made of plastic, wood or other lightweight material.

The gravity self-locking damper 215 also includes a turning shaft 303 , which passes through the wind plate 301 so that the wind plate 301 can turn around the turning shaft 303 .

As shown in FIG. 3 , a counterweight 302 is arranged at one end of the wind plate 301 , such as the lower end, so that the wind plate 301 remains vertical to close the air outlet without external force. The counterweight can be made of high-density materials such as metal, for example. The counterweight 302 is installed at a suitable position on the wind plate 301, so that the wind plate 301 will naturally return to the lowest point under the action of gravity, that is, the place where the gravitational potential energy is the smallest, when there is no external force, that is, when there is no wind to be exhausted or fresh air, so that the wind plate 301 is closed tuyere. And when introducing fresh air or discharging the wind to be exhausted, the wind plate 301 is turned around the turning axis 303 against the gravity under the suction of the fresh wind or the thrust of the wind to be exhausted, thereby creating a gap, so that the fresh wind or the wind to be exhausted can pass through the gap Into the tuyere or out of the tuyere (see arrow in Figure 3). Also shown in FIG. 3 is a stopper 304 which may be arranged at the bottom and/or top of the tuyere. The stopper 304 can prevent the wind plate from moving in reverse, that is, from moving in a direction opposite to the direction of airflow (fresh air, to-be-discharged air).

Through the gravity self-locking damper 215, each damper can be automatically closed when no fresh air is introduced or the air to be exhausted is discharged, thereby effectively preventing pollutants or foreign matter from entering the air duct through the damper to cause pollution or blockage.

Fig. 4 shows a schematic diagram of an operating room real-time detection system 400 of the air purification system 100 according to the present invention. In Fig. 4, the operating room real-time detection system 400 exemplarily includes a temperature detector 401, a humidity detector 402, an anemometer 403, a pressure difference detector 404, and a particle detector 405, which are respectively configured to detect The temperature, humidity, wind speed, pressure difference value and particle concentration or number of particles. In this embodiment, the operating room real-time detection system 400 may also include a wireless transmitting unit 406, which is configured to wirelessly transmit the detected temperature value, humidity value, wind speed value, pressure difference value and particle concentration value or particle The data is sent to the central controller 407. The central controller 407 is preferably arranged in the air purification system 100, but may also be arranged separately from the air purification system 100 and connected and communicated with the air purification system 100 in a wireless or wired manner. The central controller 407 adjusts the system manually or automatically according to the received information to maintain the desired air parameters of various operating rooms, including parameter display and alarm. Here, it should be pointed out that although in this embodiment the operating room real-time detection system 300 is shown as communicating with the central controller 407 in a wireless manner, in other embodiments, the communication may also be performed in a wired manner, and in other implementations In one example, fewer or more detection devices may be placed in the operating room.

While certain embodiments of the invention have been described in this specification, it will be apparent to those skilled in the art that these embodiments have been presented by way of example only. Those skilled in the art can think of many variations, substitutions and improvements without departing from the scope of the present invention. It is intended that the scope of the invention be defined by the appended claims and that methods and structures within the scope of such claims themselves and their equivalents be covered thereby.

Claims (14)

1. A low-noise modular air purification system, comprising: ·Medical exhaust and fresh air integrated cabinet, including A first cabinet having: Used to introduce the exhaust air inlet to be exhausted; Exhaust outlet for exhausting the air to be exhausted; an exhaust air channel, which connects the exhaust air inlet with the exhaust air outlet for guiding the air to be exhausted; an exhaust fan, which is arranged between the exhaust inlet and the exhaust outlet in the exhaust passage for guiding the air to be exhausted from the exhaust inlet to the exhaust outlet; An exhaust air filter module, which is arranged before the exhaust fan for purifying and filtering the exhaust air; A heat recovery device, which is arranged between the exhaust fan and the exhaust air outlet in the exhaust air passage, and the heat recovery device includes a plate heat exchanger for recovering waste heat or waste cold in the exhaust air; a fresh air inlet for introducing fresh air, the fresh air inlet being in communication with the plate heat exchanger for absorbing waste heat or waste cold collected by the plate heat exchanger from the exhaust air; A fresh air pretreatment device, which is arranged at the fresh air inlet for preprocessing the fresh air; a first fresh air channel, which connects the fresh air inlet with the second cabinet for guiding fresh air from the fresh air inlet to the second cabinet; a fresh air intake fan, which is arranged behind the heat recovery device in the fresh air flow direction in the first fresh air passage for introducing fresh air into the first cabinet; and a preheater, which is arranged in the first fresh air channel before the fresh air inlet fan; and A second cabinet with: Fresh air outlet, which is used to send out fresh air; The second fresh air passage connects the first fresh air passage to the fresh air outlet for guiding the fresh air from the first cabinet to the fresh air outlet; An air purification device, which includes a fresh air terminal filter device arranged at the fresh air outlet; An indoor unit for air conditioning, which includes a dehumidifier, a heater and a humidifier arranged in the second fresh air passage; Outdoor units for air conditioners, which include digital variable capacity direct expansion air-cooled units for supplying cooling to dehumidifiers; and a fresh air outlet fan, which is used to discharge fresh air from the second cabinet through the fresh air outlet; ·Return air treatment air supply ceiling, the air supply ceiling is used to be installed on the top wall of the medical room and connected to the fresh air outlet of the medical exhaust and fresh air integrated cabinet through the fresh air pipe to introduce fresh air, the air supply ceiling has: A plenum for mixing fresh and return air; A directional air blower, which is arranged in the static pressure chamber and communicates with the fresh air duct, wherein the directional air blower has an air supply hole facing away from the circulating air processing device, so that the fresh air sent through the air supply hole is Bounced off the walls of the supply ceiling and mixed evenly with the return air to form circulating air; and A circulating air treatment device, which has a housing for isolating the static pressure chamber, the circulating air treatment device has: A plurality of fan filter units, whose circulating air inlet is connected with the static pressure chamber and whose circulating air outlet is aligned with the air supply ceiling filter layer, is used to introduce the circulating air mixed with return air and fresh air, and purify and filter the circulating air. The purified and filtered circulating air is transported to the direction of the air supply ceiling filter layer; The air supply ceiling filter layer is used to purify and filter the circulating air output by the fan filter unit, so that the purified and filtered circulating air is input into the medical room in the form of weak turbulence; and • The air return port, which communicates with the medical room and communicates with the static plenum through the return air duct for introducing the return air from the medical room into the static plenum of the air purification system. 2. The air purification system according to claim 1, wherein the plurality of fan filter units are four fan filter units, and the noise value of each fan filter unit is selected to be less than or equal to 45dB. 3. The air purification system according to claim 1, wherein the filter devices of the plurality of fan filter units include a fan, a motor, and a sound-absorbing volute. 4. The air purification system according to claim 1, wherein a porous sound-absorbing plate is arranged on the wall of the static pressure chamber, and a muffler is arranged on the fresh air duct. 5. The air cleaning system according to claim 1, wherein an enclosure is arranged at the lower end of the return air treatment air supply ceiling for guiding the airflow output by the return air treatment air supply ceiling. 6. The air purification system according to any one of claims 1 to 5, wherein the low-noise modular air purification system includes two air return paths, each air return path includes a plurality of air return ports, and each air return path 50% of the return air volume is input respectively, wherein the return air velocity of the return air outlet is controlled to be less than or equal to 1m/s. 7. The air purification system according to any one of claims 1 to 5, wherein the medical rooms include: operating rooms, general wards, neonatal wards, central supply rooms, and ICU wards. 8. The air purification system according to any one of claims 1 to 5, wherein the first cabinet further comprises a chemical filter module arranged between the fresh air inlet and the fresh air intake fan for chemically filtering the fresh air, wherein the The chemical filter module includes a medium-efficiency filter layer. 9. The air purification system according to any one of claims 1 to 5, wherein the thickness of the air-supply ceiling filter layer and/or the folded pitch of the filter paper of the air-supply ceiling filter layer are adjusted and the air supply speed is changed so that the The incoming fresh air and return air enter the medical room in the form of weak turbulence. 10. The air purification system according to any one of claims 1 to 5, wherein the fresh air fan and/or the fan filter unit and/or the exhaust fan are equipped with a brushless DC motor, wherein the speed of the brushless DC motor can vary level adjustment. 11. The air purification system according to claim 10, wherein the air purification system is configured to adjust the rotation speed of the fresh air fan and the brushless DC motor of the fan filter unit according to the cleanliness requirements of the medical room. 12. The air purification system according to claim 11, wherein the medical room is an operating room, and the air purification system also includes an operating room real-time detection system, and the operating room real-time detection system includes a temperature detector, a humidity detection instrument, wind speed detector, pressure difference detector, and particle detector, and the air purification system is configured to adjust the fresh air fan and/or according to the detected temperature, humidity, wind speed, pressure difference value, and particle concentration The speed of the brushless DC fan of the return air fan and/or exhaust fan, the life of the filter layer, the air volume and cleanliness, and the cooling capacity of the digital variable capacity direct expansion air-cooled unit. 13. The air purification system according to any one of claims 1 to 5, wherein a gravity self-locking damper is respectively arranged in the fresh air inlet and exhaust outlet of the medical exhaust and fresh air integrated cabinet, and the gravity self-locking damper has: Air plate, the size of which matches the air outlet; A turning axis, which passes through the wind plate so that the wind plate can turn around the turning axis; Counterweight, it is arranged at one end of described wind board, makes wind board keep vertically to close tuyere under the situation of not being subjected to external force; And A stopper is arranged on the top and/or bottom of the air outlet to prevent the wind panel from deflecting in reverse. 14. An operating room with a low-noise modular air cleaning system according to one of the preceding claims.