Device for sampling air microorganisms in central air conditioning system

Abstract

The utility model belongs to the technical field of air microorganism sampling, and particularly relates to a device for sampling air microorganisms inside a central air conditioning system, which comprises a first vertical straight pipe, a reducer pipe and a second vertical straight pipe which are sequentially connected, the tail end of the second vertical straight pipe is connected with an air microorganism sampling tank; the first vertical straight pipe is communicated with a tail end air pipe of the central air conditioning system through a stop valve; and a flow equalizing sheet is arranged in the second vertical straight pipe. Part of flow from the interior of the air conditioner is shunted through the design of the bypass pipe, and the speed of reaching the second vertical straight pipe is reduced; and the wind speed finally entering the air microorganism sampling tank filled with the culture dish is approximately uniformly distributed through the flow equalizing sheet. Through triple design of the bypass pipe, the reducer pipe and the flow equalizing sheet, the air speed of the air microorganism sampling tank is strictly controlled within a required range, so that air microorganisms can be smoothly collected for later detection and analysis.

Description

Technical Field

[0001] The utility model belongs to the technical field of air microorganism sampling, and in particular relates to a device for sampling air microorganisms inside a central air-conditioning system. Background Art

[0002] Indoor air quality is closely related to the operation of the central air conditioning system. When the central air conditioning system is neglected for a long time and is not properly cleaned, it will cause secondary microbial contamination, thus posing a threat to the health of indoor personnel. There are many pathogenic microorganisms in the central air conditioning system, and they can survive in various parts, causing different hazards (Table 1). Therefore, the air microorganisms inside the central air conditioning system should be collected in time, and the composition and distribution of the internal air microorganisms should be paid attention to at all times, so as to take corresponding control measures to prevent the spread of secondary contamination of central air conditioning microorganisms. However, some literatures generally mention that a microbial detection system can be added to the central air conditioning system, but do not mention specific and detailed introductions and usage methods of the air microbial detection system.

[0003] Testing the concentration of air microorganisms after air microorganism cultivation is a relatively accurate and mature technology. Therefore, on this basis, it is urgent to develop a simple and convenient air microorganism collection device inside the central air conditioning system for sampling air microorganisms for subsequent detection and analysis. However, there is currently no device specifically for sampling air microorganisms inside central air conditioning systems.

[0004] Table 1 Common microorganisms and their growth sites in air conditioners

[0005] Utility Model Content

[0006] The utility model aims to provide a device for sampling air microorganisms inside a central air-conditioning system, which solves the problem that there is currently no device specifically for sampling air microorganisms inside a central air-conditioning system.

[0007] The utility model is realized by the following technical solutions:

[0008] A device for sampling air microorganisms inside a central air conditioning system, comprising a first vertical straight pipe, a reducing pipe and a second vertical straight pipe connected in sequence, a bypass pipe is added to the first vertical straight pipe, and an air microorganism sampling tank is connected to the end of the second vertical straight pipe;

[0009] The first vertical straight pipe is connected to the terminal air duct of the central air conditioning system via a stop valve;

[0010] A flow balancing plate is arranged inside the second vertical straight tube.

[0011] Furthermore, the air microbial sampling canister adopts the Andersen air microbial sampling canister.

[0012] Furthermore, a wind speed sensor is installed at the end of the second vertical straight tube to detect the wind speed entering the air microorganism sampling tank.

[0013] Furthermore, the flow equalizing plate is located at the upper section of the second vertical straight tube.

[0014] Furthermore, a plurality of ventilation holes are opened on the current balancing plate, and the aperture of the ventilation holes is 2.5 mm.

[0015] Furthermore, a regulating valve is provided in the bypass pipe.

[0016] Furthermore, the reduced end of the reducer is connected to the second vertical straight pipe, and the taper of the reducer is less than 60°.

[0017] Furthermore, the end of the terminal air duct is also connected to a horizontal straight pipe, the horizontal straight pipe is horizontally connected to the terminal air duct, and the horizontal straight pipe is vertically connected to the first vertical straight pipe through a bent pipe.

[0018] Compared with the prior art, the utility model has the following beneficial technical effects:

[0019] The utility model discloses a device for sampling air microorganisms inside a central air conditioning system, comprising a first vertical straight pipe, a reducer and a second vertical straight pipe connected in sequence, which are air duct components connected by several sections of pipes, and an air microorganism sampling tank is connected to the end of the air duct component. The air duct at the end of the air conditioner is connected to the air duct component through a stop valve, so that the air inside the air conditioner can smoothly reach the air microorganism sampling tank, which plays a role of connection. The wind speed direction of the terminal air duct located at a high place is changed and drained to the air microorganism sampling tank located at a low place, which is convenient for staff to take samples. Through the design of the bypass pipe, a part of the flow coming out of the air conditioner is diverted to reduce the speed reaching the second vertical straight pipe; and then the wind speed distribution of the air microorganism sampling tank containing a culture dish is roughly uniform through the flow equalizer. Through the triple design of the bypass pipe, the reducer and the flow equalizer, the wind speed of the air microorganism sampling tank is strictly controlled within the required range, and the wind speed entering the tank mouth is ensured to be uniform and stable, so as to ensure that the air microorganisms can be smoothly collected for later detection and analysis.

[0020] When sampling is not required, there is no need to connect the duct components at the terminal duct, and the stop valve can be closed; when sampling is required, the duct components can be connected at the terminal duct and the stop valve can be opened. Sampling can be done while the central air conditioning system is running, which does not affect the normal operation of the air conditioning unit or the normal work and activities of indoor personnel. It can also achieve the purpose of sampling the air microorganisms inside the air conditioner at any time, and timely understand the concentration of air microorganisms inside the central air conditioner, so as to effectively reduce the risk of air microorganisms spreading through the air conditioning system and protect people's health.

[0021] Furthermore, a wind speed sensor is installed at the end of the second vertical straight tube to ensure that the wind speed entering the air microorganism sampling tank is controlled at 0.96m / s, meeting the collection requirements of the Andersen air microorganism sampling tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a device for sampling air microorganisms inside a central air-conditioning system disclosed in Example 1 of the utility model;

[0023] Figure 2 is the velocity distribution contour diagram of the second vertical straight pipe;

[0024] Figure 3 This is a schematic diagram of the structure of a device for sampling air microorganisms inside a central air-conditioning system disclosed in Example 2 of the utility model;

[0025] Among them, 1. terminal air duct; 2. stop valve; 3. horizontal straight pipe; 4. bent pipe; 5. first vertical straight pipe; 6. regulating valve; 7. bypass pipe; 8. reducer; 9. flow equalizing plate; 10. second vertical straight pipe; 11. air microorganism sampling tank. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the following is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model, that is, the embodiments described are only part of the embodiments of the utility model, not all of the embodiments.

[0027] The components described and shown in the drawings and embodiments of the present invention can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. Based on the drawings and embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] It should be noted that the terms "comprises", "includes" or any other variants are intended to cover non-exclusive inclusion, so that a process, element, method, article or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to the process, element, method, article or device. In addition, the terms "horizontal" and "vertical" are based on the orientation and positional relationship of the devices or components shown in the drawings, and are only for the purpose of better describing the utility model, rather than requiring the devices, components or equipment shown to have this specific orientation, and therefore cannot be understood as limitations on the utility model.

[0029] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0030] like Figure 1 As shown, the utility model discloses a device for sampling air microorganisms in a central air conditioning system, which is a duct member connected to a terminal duct 1 of the central air conditioning system, and the terminal duct 1 is connected to the duct member by a stop valve 2. An air microorganism sampling tank 11 is connected to the end of the duct member.

[0031] The stop valve 2 is used to connect the air duct 1 at the terminal of the air conditioner and the air duct component, so that the air inside the air conditioner can smoothly reach the air microorganism sampling tank 11, playing a role of connection. When sampling is not required, there is no need to connect the air duct component at the terminal air duct 1, and the stop valve 2 can be closed; when sampling is required, the air duct component is connected at the terminal air duct 1, and the stop valve 2 can be opened. Sampling can be done when the central air conditioning system is running, which neither affects the normal operation of the air conditioning unit nor the normal work and activities of indoor personnel. It can also achieve the purpose of sampling the air microorganisms inside the air conditioner at any time, and timely understand the concentration of air microorganisms inside the air conditioner, so as to effectively reduce the risk of air microorganisms spreading through the air conditioning system and protect people's health.

[0032] Specifically, a culture dish is placed inside the air microorganism sampling tank 11 to collect air microorganisms inside the central air conditioning system for later analysis. The commonly used air microorganism sampling tank 11 is the Andersen air microorganism sampling tank. The Andersen air microorganism sampling tank requires a suction speed of 0.96m / s, so the wind speed entering the air microorganism sampling tank 11 must be strictly controlled.

[0033] Example 1

[0034] The air duct component includes a horizontal straight pipe 3, a curved pipe 4, a first vertical straight pipe 5, a reducing pipe 8 and a second vertical straight pipe 10 which are connected in sequence. A bypass pipe 7 is added to the first vertical straight pipe 5, and an air microorganism sampling tank 11 is connected to the end of the second vertical straight pipe 10, so as to implement fast and convenient sampling of air microorganisms inside the central air-conditioning system.

[0035] The horizontal straight pipe 3 is horizontally connected to the terminal air duct 1, and the horizontal straight pipe 3 is vertically connected to the first vertical straight pipe 5, which changes the wind speed direction of the terminal air duct 1 located at a high place and guides it to the air microorganism sampling tank 11 located at a low place, so as to facilitate sampling by staff.

[0036] Specifically, the horizontal straight pipe 3, the first vertical straight pipe 5 and the terminal air duct 1 have the same diameter for easy connection.

[0037] Preferably, a flow equalizer 9 is provided in the second vertical straight tube 10, so that the velocity at the outlet of the second vertical straight tube 10 is more uniform. The flow equalizer 9 is circular, and the diameter of the built-in small hole is 2.5 mm, which is the same as the diameter of the second vertical straight tube 10. The flow equalizer 9 is located above the second vertical straight tube 10 and below the reducer 8, and should be placed in a suitable position so that the wind speed distribution entering the air microorganism sampling tank 11 containing the culture dish is roughly uniform.

[0038] More preferably, a regulating valve 6 is provided in the bypass pipe 7 for diverting a portion of the flow coming out of the air conditioner to reduce the speed reaching the second vertical straight pipe 10 .

[0039] More preferably, a wind speed sensor is installed at the end of the second vertical straight tube 10 to detect the wind speed entering the air microorganism sampling tank 11.

[0040] The reducer 8 is used to connect the first vertical straight pipe 5 and the second vertical straight pipe 10 , the included angle thereof is preferably less than 60°, and the diameters of the upper and lower holes should be the same as those of the first vertical straight pipe 5 and the second vertical straight pipe 10 .

[0041] When the utility model is used, the air inside the central air-conditioning system comes out from the terminal air duct 1, passes through the opened stop valve 2 to reach the horizontal straight pipe 3, and then enters the curved pipe 4 and the first vertical straight pipe 5. At this time, the regulating valve 6 built into the bypass pipe 7 is used to divert a part of the flow coming out of the air conditioner to reduce the speed reaching the second vertical straight pipe 10, and then passes through the reducer 8 and the flow equalizing plate 9 to make the outlet speed more uniform. Finally, the air enters the air microorganism sampling tank 11, so as to achieve the purpose of collecting air microorganisms inside the central air conditioner.

[0042] The bypass pipe 7 and the regulating valve 6 are used to adjust the flow entering the air microorganism sampling tank 11, reduce the flow out of the central air-conditioning system, and make the air enter the second vertical straight pipe 10 at a more appropriate speed, so that it can reach the suction speed of 0.96m / s that meets the air microorganism sampling tank 11. The diameter of the bypass pipe 7 is the same as the diameter of the horizontal straight pipe 3.

[0043] The length of the second vertical straight tube 10 needs to be determined according to the relative position of the equalizing plate 9 and the tank mouth. Since the diameter of the tank mouth of the air microorganism sampling tank 11 is 25 mm, the diameter of the second vertical straight tube 10 must be at least greater than 25 mm. First, determine the diameter of the second vertical straight tube 10, and then determine the specific position of the equalizing plate 9. Finally, use the finite volume method to discretize the control equation. After the control equation is discretized, use the SIMPLE pressure-velocity coupling algorithm. The least squares interpolation based on the unit cell is applied to the discretization of the spatial gradient. The pressure, momentum, turbulent kinetic energy, and turbulent dissipation rate are determined using the second-order upwind format as follows: Figure 2 The velocity distribution contour lines in the second vertical straight tube 10 are shown, and then the installation position of the mouth of the air microorganism sampling tank 11 is determined, that is, the plane where the velocity of the second vertical straight tube 10 is 0.96m / s. The final placement position of the mouth of the air microorganism sampling tank 11 is the end of the second vertical straight tube 10, so the length and diameter of the second vertical straight tube 10 are determined.

[0044] Example 2

[0045] like Figure 3 As shown, the air duct component includes a first vertical straight pipe 5, a reducing pipe 8 and a second vertical straight pipe 10 which are connected in sequence. A bypass pipe 7 is added to the first vertical straight pipe 5, and an air microorganism sampling tank 11 is connected to the end of the second vertical straight pipe 10, so as to implement fast and convenient sampling of air microorganisms inside the central air-conditioning system.

[0046] The stop valve 2 is installed on the lower side of the terminal air duct 1, and the terminal air duct 1 is vertically connected to the first vertical straight pipe 5, which changes the wind speed direction of the terminal air duct 1 located at a high place and guides it to the air microorganism sampling tank 11 located at a low place, so as to facilitate sampling by staff.

[0047] Preferably, a flow equalizer 9 is provided in the second vertical straight tube 10, so that the velocity at the outlet of the second vertical straight tube 10 is more uniform. The flow equalizer 9 is circular, and the diameter of the built-in small hole is 2.5 mm, which is the same as the diameter of the second vertical straight tube 10. The flow equalizer 9 is located above the second vertical straight tube 10 and below the reducer 8, and should be placed in a suitable position so that the wind speed distribution entering the air microorganism sampling tank 11 containing the culture dish is roughly uniform.

[0048] More preferably, a regulating valve 6 is provided in the bypass pipe 7 for diverting a portion of the flow coming out of the air conditioner to reduce the speed reaching the second vertical straight pipe 10 .

[0049] More preferably, a wind speed sensor is installed at the end of the second vertical straight tube 10 to detect the wind speed entering the air microorganism sampling tank 11.

[0050] The reducer 8 is used to connect the first vertical straight pipe 5 and the second vertical straight pipe 10 , and the included angle thereof is preferably less than 60°. The diameters of the upper and lower holes should be the same as those of the first vertical straight pipe 5 and the second vertical straight pipe 10 .

[0051] When the utility model is used, the air inside the central air-conditioning system comes out from the terminal air duct 1 and passes through the opened stop valve 2 to reach the first vertical straight pipe 5. At this time, the regulating valve 6 built into the bypass pipe 7 is used to divert a part of the flow coming out of the air conditioner to reduce the speed reaching the second vertical straight pipe 10. Subsequently, the speed of the outlet is made more uniform through the reducer 8 and the flow equalizer 9. Finally, the air enters the air microorganism sampling tank 11, so as to achieve the purpose of collecting air microorganisms inside the central air conditioner.

[0052] The two structures of Example 1 and Example 2 can be selected according to the actual installation space and can be flexibly adapted.

[0053] The utility model designs a device for sampling air microorganisms inside a central air-conditioning system. The device has a simple structure and is easy to operate. It neither affects the normal operation of the air-conditioning unit nor the normal work and activities of indoor personnel. It can also achieve the purpose of sampling air microorganisms inside the central air-conditioning system at any time, and can effectively prevent the risk of secondary pollution caused by pathogenic air microorganisms spread through the central air-conditioning system, thereby ensuring people's health.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A device for sampling air microorganisms inside a central air conditioning system, characterized in that: The invention comprises a first vertical straight pipe (5), a reducing pipe (8) and a second vertical straight pipe (10) which are connected in sequence, a bypass pipe (7) is provided on the first vertical straight pipe (5), and an air microorganism sampling tank (11) is connected to the end of the second vertical straight pipe (10); The first vertical straight pipe (5) is connected to the terminal air pipe (1) of the central air conditioning system via a stop valve (2); A flow balancing plate (9) is provided inside the second vertical straight tube (10).

2. A device for sampling air microorganisms in a central air conditioning system according to claim 1, characterized in that: The air microorganism sampling canister (11) adopts the Andersen air microorganism sampling canister.

3. The device for sampling air microorganisms in a central air conditioning system according to claim 1, characterized in that: A wind speed sensor is installed at the end of the second vertical straight tube (10) for detecting the wind speed entering the air microorganism sampling tank (11).

4. The device for sampling air microorganisms in a central air conditioning system according to claim 1, characterized in that: The flow balancing plate (9) is located at the upper section of the second vertical straight tube (10).

5. The device for sampling air microorganisms in a central air conditioning system according to claim 1, characterized in that: The flow balancing plate (9) is provided with a plurality of ventilation holes, each of which has a diameter of 2.5 mm.

6. The device for sampling air microorganisms in a central air conditioning system according to claim 1, characterized in that: A regulating valve (6) is arranged in the bypass pipe (7).

7. The device for sampling air microorganisms in a central air conditioning system according to claim 1, characterized in that: The reduced end of the reducer (8) is connected to the second vertical straight pipe (10), and the taper of the reducer (8) is less than 60°.

8. The device for sampling air microorganisms in a central air conditioning system according to claim 1, characterized in that: The end of the terminal air duct (1) is also connected to a horizontal straight pipe, the horizontal straight pipe (3) is horizontally connected to the terminal air duct (1), and the horizontal straight pipe (3) is vertically connected to the first vertical straight pipe (5) through a curved pipe (4).

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