A multi-power source exhaust system and air volume adjustment method thereof

Abstract

The present invention discloses a multi-power source exhaust system for multi-story buildings, including an exhaust duct shaft that runs through each floor of the multi-story building, each floor of the multi-story building is respectively provided with an exhaust device with an independent power source, the exhaust port of the exhaust device is fluidly connected to the air inlet of the exhaust duct shaft through an exhaust pipe, the exhaust pipe is provided with an air volume measuring device for measuring the actual exhaust volume of the exhaust device and an air volume regulating valve for controlling the actual exhaust volume, and a static pressure measuring device is provided in the exhaust pipe or at the air inlet of the exhaust duct shaft to measure the relative static pressure that the exhaust devices of each floor need to overcome. The present invention also relates to a method for adjusting the exhaust air volume of each floor in the exhaust system, by measuring and controlling the static pressure and actual exhaust volume of each floor, the air volume discharged into the exhaust duct shaft of each floor in the exhaust pipe network system can be made roughly the same, effectively solving the problem of smoke backflow caused by small exhaust air volume or even failure to exhaust at the bottom floor.

Description

Technical Field

[0001] The invention relates to the field of exhaust gas in multi-storey buildings, and in particular to a multi-power source exhaust system for multi-storey buildings and an air volume adjustment method thereof. Background Art

[0002] In modern high-rise residential buildings, exhaust gas (such as kitchen fumes and bathroom exhaust gas) on each floor is usually discharged into the exhaust duct shaft by exhaust devices such as range hoods or exhaust fans, and then discharged to the environment above the building through the exhaust duct shaft. Therefore, the exhaust devices and exhaust duct shafts on each floor constitute a multi-power source exhaust pipe network system. Usually, the exhaust capacity of the range hoods and / or exhaust fans of users on each floor is roughly the same. Therefore, when users on each floor exhaust at the same time, the lower the floor, the smaller the air volume that can be exhausted. Therefore, it is easy for users on the upper floor to have a large exhaust volume and users on the lower floor to have a small exhaust volume, and even for users on the lower floor to be unable to exhaust fumes or exhaust gas and cause smoke backflow.

[0003] Therefore, in order to solve this problem, it is necessary to provide an improved multi-power source exhaust system for multi-story buildings and an air volume adjustment method thereof. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a multi-power source exhaust system for multi-story buildings and an air volume adjustment method thereof. Specifically, the present invention provides the following technical solutions.

[0005] In one aspect, the present invention provides a multi-power source exhaust system for a multi-story building, comprising an exhaust duct shaft that runs through each floor of the multi-story building, the exhaust duct shaft being provided with an air inlet on each floor and a total air outlet at the uppermost end, each floor of the multi-story building being provided with an exhaust device with an independent power source, the exhaust port of the exhaust device being fluidly connected to the air inlet of the exhaust duct shaft via an exhaust pipe, an air volume measuring device for measuring an actual exhaust volume of the exhaust device and an air volume regulating valve for controlling the actual exhaust volume being provided in the exhaust pipe, a static pressure measuring device being provided in the exhaust pipe or at the air inlet of the exhaust duct shaft for measuring the relative static pressure that the exhaust devices on each floor need to overcome.

[0006] Furthermore, the above-mentioned static pressure measuring device is a differential pressure measuring device, including a differential pressure gauge and an adapter seat, the high-pressure interface and the low-pressure interface of the differential pressure gauge are respectively connected to a first plug and a second plug, the adapter seat includes a first jack and a second jack, the first jack is connected to a first connector for connecting a high-pressure fluid through a first valve, and the second jack is connected to a second connector for connecting a low-pressure fluid through a second valve; when the differential pressure measuring device is in a first state allowing the differential pressure gauge and the adapter seat to be separated from each other, the first valve is closed so that the first jack is not fluidly connected to the first connector, and the second valve is closed so that the second jack is not fluidly connected to the second connector; when the differential pressure measuring device is in a second state allowing the differential pressure gauge to measure the pressure difference between the first connector and the second connector, the first plug is inserted into the first jack and the first valve is opened so that the first plug is fluidly connected to the first connector, and the second plug is inserted into the second jack and the second valve is opened so that the second plug is fluidly connected to the second connector.

[0007] Further, the high-pressure interface is connected to the first plug through a third valve, the low-pressure interface is connected to the second plug through a fourth valve, the third valve is also connected to the second plug through a branch pipe, and the fourth valve is also provided with a reference interface for connecting a reference fluid; when the differential pressure measuring device is in the second state, the third valve is configured so that the high-pressure interface is in fluid communication with the first plug and the branch pipe is not in fluid communication with the high-pressure interface and the first plug, the fourth valve is configured so that the low-pressure interface is in fluid communication with the second plug and the reference interface is not in fluid communication with the low-pressure interface and the second plug; when the differential pressure measuring device is in a state that allows the differential pressure gauge to measure between the first connector and the reference interface When the pressure difference measuring device is in a third state of allowing the differential pressure gauge to measure the pressure difference between the second connector and the reference interface, the third valve is configured so that the high-pressure interface is in fluid communication with the first plug and the branch pipe is not in fluid communication with the high-pressure interface and the first plug, and the fourth valve is configured so that the low-pressure interface is in fluid communication with the reference interface and the low-pressure interface is not in fluid communication with the second plug; when the pressure difference measuring device is in a fourth state that allows the differential pressure gauge to measure the pressure difference between the second connector and the reference interface, the third valve is configured so that the high-pressure interface is in fluid communication with the second plug through the branch pipe and the high-pressure interface is not in fluid communication with the first plug, and the fourth valve is configured so that the low-pressure interface is in fluid communication with the reference interface and the low-pressure interface is not in fluid communication with the second plug.

[0008] Furthermore, the pressure of the high-pressure fluid is greater than or equal to the pressure of the low-pressure fluid, and the pressure of the low-pressure fluid is greater than or equal to the pressure of the reference fluid; preferably, the reference fluid is ambient atmosphere, and the pressure of the reference fluid is atmospheric pressure.

[0009] Furthermore, the first valve and the second valve are each independently a one-way valve; the third valve and the fourth valve are each independently a three-way stopcock valve; the outer peripheral wall surfaces of the first plug and the second plug are each independently provided with a sealing ring; in the second state, a magnet, Velcro or a combination thereof for increasing the connection strength between the differential pressure gauge and the adapter seat is provided or not provided at the adjacent or connected portion of the differential pressure gauge and the adapter seat.

[0010] Furthermore, the differential pressure gauge is a pointer-type differential pressure gauge or a digital differential pressure gauge, the third valve or the fourth valve has a manual actuator and / or an automatic actuator, and the differential pressure gauge measuring device is also provided with or without a communication device for transmitting the measured pressure difference value to a server and / or transmitting the execution instruction to the automatic actuator.

[0011] Furthermore, the exhaust device is a range hood or an exhaust fan or an exhaust blower, the air volume measuring device is an orifice flowmeter, the air volume regulating valve is a butterfly valve, and the pressure tapping port of the static pressure measuring device is the upstream pressure tapping hole or the downstream pressure tapping hole of the orifice flowmeter, or is arranged in the exhaust duct shaft about 30 cm below the air inlet.

[0012] In another aspect, the present invention provides an air volume adjustment method for a multi-power source exhaust system, comprising the following steps:

[0013] S000, providing the above-mentioned multi-power source exhaust system for multi-story buildings;

[0014] S100, starting the exhaust device of each floor in the multi-story building and adjusting its exhaust power to the maximum or adjusting its exhaust gear to the maximum, and adjusting the opening of the air volume regulating valve of each floor to the maximum, wherein the opening refers to the ratio of the air volume of the air volume regulating valve at the opening to the air volume at its maximum opening; preferably, when the air volume of the air volume regulating valve is proportional to its opening, for example, when the air volume regulating valve is a butterfly valve, the opening refers to the ratio of the ventilation cross section of the air volume regulating valve at the opening to its maximum ventilation cross section;

[0015] S200, use the static pressure measuring device to measure the relative static pressure ΔP of each layer i , where i represents the number of layers, which is an integer from 1 to n, the first layer is the lowest layer, and the nth layer is the highest layer;

[0016] S300, calculate ΔP of each layer i / ΔP 1 The ratio k i , where ΔP i is the relative static pressure of the i-th layer, ΔP 1 is the relative static pressure of layer 1;

[0017] S400, adjust the opening of the air volume control valve of each floor to the corresponding ki .

[0018] Furthermore, in step S200, the relative static pressure ΔP i is the relative static pressure ΔP of the upstream pressure tapping hole of the orifice flowmeter 上i Or the relative static pressure ΔP of the downstream pressure tapping hole 下i , or the relative static pressure ΔP at the air inlet of the exhaust shaft 井i , where i represents the number of layers, which is an integer from 1 to n, the first layer is the lowest layer, and the nth layer is the highest layer.

[0019] Further, in step S300, the relative static pressure ΔP of each layer is i The data is smoothed, and then the smoothed ΔP of each layer is used i Data calculation of ΔP of each layer i / ΔP 1 The ratio k i .

[0020] Furthermore, the air volume adjustment method for a multi-power source exhaust system further comprises the following steps:

[0021] S500, after step S400, use the air volume measuring device of each floor to measure the actual exhaust volume Q of the exhaust device of each floor i , and then calculate the actual exhaust volume Q of each floor exhaust device i The average value of actual exhaust volume of exhaust devices on each floor The degree of deviation between i , where the i-th layer and b i The calculation formula is as follows:

[0022] S600, will b i The absolute value of |b i |Compared with the set value, when b i The absolute value of |b i |When the air volume of the i-th layer is not greater than the set value, it is judged that the air volume adjustment is successful, wherein the set value is not greater than 50%, preferably not greater than 40%, preferably not greater than 30%, preferably not greater than 20%, preferably not greater than 10%, preferably not greater than 5%, preferably not greater than 2%, preferably not greater than 1%.

[0023] Further, when in step S600 |b i |When it is greater than the above set value, perform the following steps:

[0024] S700, calculate k′ i =k i (1+b i ), and then adjust the opening of the air volume control valve on the i-th floor to k′i .

[0025] Further, after step S700, steps S500 and S600 are performed again. If |b′ of the i-th layer i | is still greater than the set value, perform the following steps:

[0026] S800, when b′ i <0, calculate k″ i = k′ i (1+b′ i ), and then adjust the opening of the air volume control valve on the i-th floor to k″ i ;or

[0027] S900, when b′ i >0, it is determined that one or more of the exhaust device, air volume adjustment device and exhaust duct shaft air inlet of the i-th layer is faulty.

[0028] In a multi-story building, the total pressure drop that the exhaust device on each floor needs to overcome includes the pressure drop generated by the air volume regulating device and the pressure drop generated by the exhaust duct shaft portion between the air inlet of the exhaust duct shaft on the floor and the air outlet of the exhaust duct shaft usually set at the top of the building. The pressure drop generated by the exhaust duct shaft portion includes not only the pressure drop generated by the exhaust duct shaft itself, but also the pressure drop generated by the air volume discharged into the exhaust duct shaft from the floors above the floor; therefore, the lower the floor, the greater the pressure drop generated by the exhaust duct shaft portion. In the present invention, the opening of the upper floor air volume regulating valve is usually smaller than the opening of the lower floor air volume regulating valve, so as to appropriately increase the total pressure drop that the exhaust device on the upper floor needs to overcome so that it is roughly the same as the total pressure drop that the exhaust device on the lower floor needs to overcome, so that the air volume discharged into the exhaust duct shaft on each floor is roughly the same, effectively solving the problem of smoke backflow caused by the small actual exhaust volume of the lower floor or even the inability to exhaust.

[0029] The multi-power source exhaust system of the present invention can measure and control the actual air volume discharged into the exhaust duct shaft by exhaust devices such as exhaust fans or range hoods, so that the air volume discharged into the exhaust duct shaft on each floor is roughly the same, effectively solving the problem of smoke backflow caused by small actual exhaust volume or even failure to exhaust on the lower floors.

[0030] According to the method of adjusting the exhaust air volume of each floor in the exhaust system of the present invention, in the process of adjusting the exhaust air volume of each floor in a multi-story building to be approximately the same, the number of times of going up and down the stairs for measurement and adjustment can be significantly reduced, the adjustment efficiency is significantly improved, and the workload of the commissioning personnel is greatly reduced.

[0031] The exhaust system and exhaust volume regulating method of the present invention can not only solve the above problems efficiently in an automated manner, but are also particularly advantageous for solving the above problems at low cost in a non-automated manner, and therefore have broad application prospects.

[0032] In the description of the present invention, "substantially" does not exclude the meaning of "completely". For example, if a component "substantially does not contain" Y, it may also be completely free of Y. If necessary, "substantially" can be deleted from the definition of the present invention. "Contains" includes both the mentioned factors and is allowed to include additional, uncertain factors. "Approximately" and "around" when used to represent the concentration of each component refer to + / -5%, + / -4%, + / -3%, + / -2%, + / -1%, + / -0.5% of the standard value. "And / or" means that the multiple terms connected by it can be used separately or in any combination with each other.

[0033] In the present invention, examples are generally described by a certain range, which is only for the purpose of concise and clear explanation, and is not intended to limit the present invention. The described range includes sub-ranges, and also includes all individual values ​​within this range. For example, the range of 1 to 6 includes sub-ranges such as 1 to 3, 1 to 4, 1 to 5, 2 to 4, 2 to 6, 3 to 6, etc., and also includes individual values ​​within this range, such as 1, 2, 3, 4, 5, 6.

[0034] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the three-dimensional structure of a multi-power source exhaust system according to an embodiment of the present invention;

[0036] Figure 2 for Figure 1 A schematic cross-sectional view of the three-dimensional structure of the air volume regulating device;

[0037] Figure 3 for Figure 2 A cross-sectional view of the middle adapter in a first state;

[0038] Figure 4 for Figure 2 A cross-sectional view of the medium differential pressure gauge and the adapter seat in a second state;

[0039] Figure 5 for Figure 2 A cross-sectional view of the medium differential pressure gauge and the adapter seat in a third state;

[0040] Figure 6 for Figure 2 A cross-sectional view of the medium differential pressure gauge and the adapter seat in a fourth state;

[0041] Figure 7 for Figure 2 A schematic diagram of the three-dimensional structure of the medium differential pressure gauge in the first state;

[0042] Figure 8 for Figure 2 A schematic diagram of the three-dimensional structure of the middle adapter in the first state;

[0043] In the figure: 1-air volume adjustment device; 10-cylinder; 101-orifice plate; 11-grid rectifier; 12-butterfly valve; 13-handle; 14-pointer; 15-scale; 16-upstream pressure hole; 17-downstream pressure hole; 21-upstream pressure pipe; 22-downstream pressure pipe; 3-differential pressure gauge; 30-differential pressure gauge housing; 301-high pressure interface; 302-low pressure interface; 303-display screen; 304-button; 31-first plug; 32-second plug; 33-third valve; 34-fourth valve; 35-reference interface; 36-branch pipe; 38-through hole; 39-sealing ring; 4-adapter seat; 40-adapter seat housing; 41-first plug hole; 411-first valve cavity; 412-first sealing end face; 42-second plug hole; 421-second valve cavity; 422-second sealing end face; 43-first joint; 44-second joint; 45-first valve plate; 451-first valve stem; 46-second valve plate; 461-second valve stem; 47-first spring; 48-second spring; 5-exhaust duct shaft; 51-air inlet; 52-main air outlet; 6-range hood; 61-exhaust port. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Example 1

[0046] See also Figure 1-8Another aspect of the present invention provides an exhaust pipe network system for a multi-story building, wherein the exhaust duct shaft 5 is provided with an air inlet 51 on each floor and a total air outlet 52 at the uppermost end, each floor of the multi-story building is provided with a range hood 6 with an independent power source as an exhaust device, and an air volume regulating device 1 is provided between the exhaust port 61 connected to the range hood 6 and the air inlet 51 of the exhaust duct shaft 5 on each floor of the multi-story building, wherein the air inlet of the air volume regulating device 1 is fluidly connected to the exhaust port 61, and the air outlet of the air volume regulating device 1 is fluidly connected to the air inlet 51.

[0047] The air volume regulating device 1 comprises a cylinder 10 and a lattice grille rectifier 11, an orifice plate 101 and a butterfly valve 12 used as an air volume regulating valve arranged in the cylinder 10, wherein the grille rectifier 11 is arranged at one end of the cylinder 10 as an air inlet, the butterfly valve 12 is arranged at the other end of the cylinder 10 as an air outlet, the orifice plate 101 is arranged in the middle of the cylinder 10, an upstream pressure-taking hole 16 is arranged on the side wall of the cylinder between the grille rectifier 11 and the orifice plate 101, and a downstream pressure-taking hole 17 is arranged on the side wall of the cylinder between the orifice plate 101 and the butterfly valve.

[0048] In a preferred embodiment, the inner diameter of the cylinder 10 is 160 mm and the length is 600 mm; the length of the grid rectifier 10 in the axial direction of the cylinder 10 is 80 mm, and the size of each grid is 20 mm×20 mm. The distance between the downstream end face of the grid rectifier 10 and the upstream pressure-taking hole 16 is 80 mm. The inner diameter of the orifice plate 101 is 125 mm. The distance between the upstream pressure-taking hole 16 and the orifice plate 101 is 160 mm. The distance between the orifice plate 101 and the butterfly valve 12 is 80 mm.

[0049] The grid rectifier 11 is composed of a plurality of guide vanes parallel to the axial direction of the cylinder 10, and the density of the guide vanes near the side wall of the cylinder 10 is greater than or equal to the density of the guide vanes near the axis of the cylinder 10. The density of the guide vanes is the length of the cross section of the guide vanes per unit cross-sectional area perpendicular to the axial direction of the cylinder 10. For example, Figure 2 In the grid rectifier 11 shown, when a unit cross-sectional area of ​​20 mm×20 mm perpendicular to the axial direction of the cylinder 10 includes exactly one 20 mm×20 mm square grid formed by guide vanes, the average density of the guide vanes is: 80 mm / 400 mm 2 .

[0050] There are 4 upstream pressure holes, which are connected to each other through the upstream pressure-taking tube 21 and then connected to the first joint 43 of the adapter seat 4; there are 4 downstream pressure holes, which are connected to each other through the downstream pressure-taking tube 22 and then connected to the second joint 44 of the adapter seat 4. The diameters of these pressure holes are all 3 mm. The end of the pressure-taking hole facing the inside of the cylinder is flush with the inner wall of the cylinder, and the surface of the end and the adjacent inner wall of the cylinder is smooth without burrs or depressions, so as to avoid pressure fluctuations caused by airflow disturbances. By setting up multiple pressure-taking holes, on the one hand, the pressure difference before and after the orifice plate can be measured more accurately, and on the other hand, the problem of pollutants in the flue gas blocking the pressure-taking holes and making it impossible to measure the pressure difference before and after the orifice plate can be effectively avoided.

[0051] In some cases, the adjusting handle of the butterfly valve is provided with a scale for marking the position of the adjusting handle, and the scale may be the rotation angle of the valve disc of the butterfly valve or the opening of the butterfly valve.

[0052] In some cases, only when it is necessary to measure the pressure difference between the upstream pressure-taking hole 16 and the downstream pressure-taking hole 17, or the pressure difference between the upstream pressure-taking hole 16 and the ambient atmosphere, or the pressure difference between the downstream pressure-taking hole 17 and the ambient atmosphere, the first plug 31 and the second plug 32 of the differential pressure gauge 3 are respectively inserted into the first plug hole 41 and the second plug hole 42 of the adapter seat 4 fixed on the cylinder 10, and the differential pressure gauge 3 is separated from the adapter seat 4 when it is not necessary to measure the above-mentioned pressure difference. When there are multiple air volume regulating devices 1, such a setting can advantageously use one differential pressure gauge 3 to complete the above-mentioned pressure difference measurement of each air volume regulating device 1.

[0053] The high-pressure interface 301 and the low-pressure interface 302 of the differential pressure gauge 3 are respectively connected to the first plug 31 and the second plug 32, the adapter seat 4 includes a first jack 41 and a second jack 42, the first jack 41 is connected to a first connector 43 for connecting a high-pressure fluid through a first valve including a first valve cavity 411 and a first valve plate 45, and the second jack 42 is connected to a second connector 44 for connecting a low-pressure fluid through a second valve including a second valve cavity 421 and a second valve plate 46; the high-pressure interface 301 is connected to the first plug 31 through a third valve 33, the low-pressure interface 302 is connected to the second plug 32 through a fourth valve 34, the third valve 33 is also connected to the second plug 32 through a branch pipe 36, and the fourth valve 34 is also provided with a reference interface 35 for connecting a reference fluid. In some cases, the high-pressure fluid, the low-pressure fluid and the reference fluid are each independently a gas flow such as an air flow, an exhaust gas flow or a flue gas flow, or a liquid flow such as a water flow, and the pressure of the high-pressure fluid is greater than or equal to the pressure of the low-pressure fluid, and the pressure of the low-pressure fluid is greater than or equal to the pressure of the reference fluid. In some cases, the third valve 33 and the fourth valve 34 are each independently a three-way stopcock valve.

[0054] like Figure 3As shown, when the differential pressure measuring device is in the first state that allows the differential pressure gauge 3 and the adapter seat 4 to be separated from each other, the first valve disc 45 and the first valve stem 451 abut against the first sealing end face 412 at the lower end of the first valve cavity 411 under the action of gravity and the push of the first spring 47, thereby closing the first valve so that the first plug hole 41 is not in fluid communication with the first joint 43, and the second valve disc 46 and the second valve stem 461 abut against the second sealing end face 422 at the lower end of the second valve cavity 421 under the action of gravity and the push of the second spring 48, thereby closing the second valve so that the second plug hole 42 is not in fluid communication with the second joint 44. In this way, the leakage of high-pressure fluid and low-pressure fluid through the first plug hole 41 and the second plug hole 42 respectively can be avoided in the non-measuring state. In some cases, when the first plug hole 41 and the second plug hole 42 are facing downward, the first spring 47 and the second spring 48 may not be provided, and the weight of the first valve stem 451 and the second valve stem 461 may be appropriately increased to help overcome the friction resistance and improve the valve closing effect. In some cases, the chambers where the first spring 47 and the second spring 48 and the first valve stem 451 and the second valve stem 461 are located are closed to help prevent leakage of the high-pressure fluid and the low-pressure fluid.

[0055] like Figure 4 As shown, when the differential pressure measuring device is in the second state allowing the differential pressure gauge 3 to measure the pressure difference between the first connector 43 and the second connector 44, the first plug 31 is inserted into the first socket 41, and the first valve plate 45 is pushed open so that the through hole 38 at the end of the first plug 31 enters the first valve chamber 411, thereby opening the first valve and making the first plug 31 fluidly connected to the first connector 43, and the second plug 32 is inserted into the second socket 42, and the second valve plate 46 is pushed open so that the through hole 38 at the end of the second plug 32 enters the second valve chamber 421, thereby opening the second valve and making the second plug 31 fluidly connected to the second connector 44; at the same time, the third valve 33 is configured so that the high-pressure interface 301 is fluidly connected to the first plug 31 and the branch pipe 36 is not fluidly connected to the high-pressure interface 301 and the first plug 31, and the fourth valve 34 is configured so that the low-pressure interface 302 is fluidly connected to the second plug 32 and the reference interface 35 is not fluidly connected to the low-pressure interface 302 and the second plug 32.

[0056] like Figure 5As shown, when the differential pressure measuring device is in the third state allowing the differential pressure gauge 3 to measure the pressure difference between the first connector 43 and the reference interface 35, the first plug 31 is inserted into the first socket 41, and the first valve plate 45 is pushed open so that the through hole 38 at the end of the first plug 31 enters the first valve chamber 411, thereby opening the first valve and making the first plug 31 fluidly connected to the first connector 43, the second plug 32 is inserted into the second socket 42, and the second valve plate 46 is pushed open so that the through hole 38 at the end of the second plug 32 enters the second valve chamber 421, thereby opening the second valve and making the second plug 31 fluidly connected to the second connector 44; at the same time, the third valve 33 is configured so that the high-pressure interface 301 is fluidly connected to the first plug 31 and the branch pipe 36 is not fluidly connected to the high-pressure interface 301 and the first plug 31, and the fourth valve 34 is configured so that the low-pressure interface 302 is fluidly connected to the reference interface 35 and the low-pressure interface 302 is not fluidly connected to the second plug 32.

[0057] like Figure 6 As shown, when the differential pressure measuring device is in the fourth state allowing the differential pressure gauge 3 to measure the pressure difference between the second connector 44 and the reference interface 35, the first plug 31 is inserted into the first socket 41, and the first valve plate 45 is pushed open so that the through hole 38 at the end of the first plug 31 enters the first valve chamber 411, thereby opening the first valve and making the first plug 31 fluidly connected to the first connector 43, the second plug 32 is inserted into the second socket 42, and the second valve plate 46 is pushed open so that the through hole 38 at the end of the second plug 32 enters the second valve chamber 421, thereby opening the second valve and making the second plug 31 fluidly connected to the second connector 44; at the same time, the third valve 33 is configured so that the high-pressure interface 301 is fluidly connected to the second plug 32 through the branch pipe 36 and the high-pressure interface 301 is not fluidly connected to the first plug 31, and the fourth valve 34 is configured so that the low-pressure interface 302 is fluidly connected to the reference interface 35 and the low-pressure interface 302 is not fluidly connected to the second plug 32.

[0058] In some cases, one or more sealing rings 39 are independently provided on the outer peripheral wall surfaces of the first plug 31 and the second plug 32. In other cases, a magnet, Velcro or a combination thereof for increasing the connection strength between the differential pressure gauge and the adapter seat may be provided at the portion where the differential pressure gauge housing 30 is adjacent to or connected to the adapter seat housing 40, such as the side of the differential pressure gauge housing 30 where the first plug 31 and the second plug 32 are located or the side of the adapter seat housing 30 where the first jack 41 and the second jack 42 are located.

[0059] In some cases, the differential pressure gauge 31 is a pointer-type differential pressure gauge or a digital differential pressure gauge, and the third valve 33 or the fourth valve 34 has a manual actuator and / or an automatic actuator; in addition, the differential pressure measuring device is also provided with a communication device for transmitting the measured differential pressure value to a server and / or transmitting the execution instruction to the automatic actuator, thereby realizing remote acquisition of the measured differential pressure value and remote control of the differential pressure measuring device to obtain the desired differential pressure value.

[0060] In some cases, the method of using the above exhaust pipe network system to adjust the air volume discharged into the exhaust duct shaft 5 by the range hood 6 on each floor of a multi-story building includes the following steps:

[0061] S100, start the range hood 6 on each floor and adjust its exhaust power or gear to the maximum (for example, when the range hood 6 has multiple exhaust gears, adjust it to the maximum exhaust gear), and at the same time adjust the opening of the butterfly valve 12 of the air volume adjustment device 1 on each floor to the maximum;

[0062] S200, using the air volume regulating device 1 of each layer to measure the relative static pressure ΔP of the upstream pressure taking hole 16 in the air volume regulating device 1 of each layer 上i (Relative static pressure is the static pressure with atmospheric pressure as the zero point, which can be obtained by measuring the pressure difference between the upstream pressure-taking hole 16 and the reference interface 35) or the relative static pressure ΔP of the downstream pressure-taking hole 17 下i (which can be obtained by measuring the pressure difference between the downstream pressure tapping hole 17 and the reference interface 35), and optionally measuring the relative static pressure ΔP at the air inlet 51 of the exhaust duct shaft 井i (It can be obtained by measuring the pressure difference between the air inlet 51 and the atmospheric pressure. The pressure point at the air inlet 51 can be set in the exhaust duct shaft near the air inlet 51, for example, in the exhaust duct shaft 30 cm below the air inlet 51), where i represents the number of layers, which is an integer from 1 to n, the first layer is the lowest layer, and the nth layer is the highest layer;

[0063] S300, select ΔP 上i , ΔP 下i and ΔP 井i One of the relative static pressures ΔP that the range hoods 6 on each floor need to overcome i , and then calculate the ΔP of each layer i / ΔP 1 The ratio k i , where ΔP i is the relative static pressure of the i-th layer, ΔP 1 is the relative static pressure of the first layer, because the relative static pressure ΔP that the range hoods 6 on each layer need to overcome i From the bottom to the top, k increases gradually. i Then it decreases gradually from the bottom to the top, 100% = k 1 >ki >k n , where i represents the number of layers, which is an integer from 1 to n, with the first layer being the lowest layer and the nth layer being the highest layer; in some cases, the relative static pressure ΔP of each layer can be i The data is smoothed (any known suitable data smoothing method can be used, such as interpolation method, linear regression method, etc.), and then the smoothed data of each layer are used to replace the original relative static pressure ΔP i Data calculation of ΔP of each layer i / ΔP 1 The ratio k i , in order to reduce the impact of accidental errors in the data (such as measurement errors); in some cases, due to measurement errors and other reasons, k i If k is greater than 100%, i Set to 100%;

[0064] S400, respectively adjust the opening of the butterfly valve 12 of the air volume adjustment device 1 of each floor to k i , where the opening refers to the ratio of the ventilation cross section of the butterfly valve 12 at this opening to its maximum ventilation cross section; when the butterfly valve 12 has a valve plate with a centrally symmetrical shape and the rotation axis passes through its symmetry center, the opening k i Rotation angle θ with valve plate i The relationship is: k i = cosθ i , or θ i =arccos(k i ), where the rotation angle θ i is the angle of the i-th valve disc from its fully closed position after rotation, that is, when θ i When θ is 0 degrees, the butterfly valve 12 is completely closed. i When the angle is 90 degrees, the butterfly valve 12 is fully opened.

[0065] In this way, according to the air volume measured by the air volume regulating device 1 of each layer, the butterfly valve 12 of each layer is adjusted accordingly, so that the air volume measured by the air volume regulating device 1 of any two adjacent layers is approximately equal. In some cases, in two adjacent layers, the difference between the air volume entering the exhaust duct shaft of the upper layer and the air volume entering the exhaust duct shaft of the lower layer is at most ±50%, at most ±40%, at most ±30%, at most ±20%, at most ±10%, or at most ±5%, or at most ±1%.

[0066] In some cases, after adjusting the butterfly valve 12 of the air volume regulating device 1 of each floor in step S400, the following steps may be performed to evaluate the adjustment result:

[0067] S500, using the air volume adjustment device 1 of each floor to measure the actual exhaust volume Q of the range hood 6 of each floor i, and then calculate the actual exhaust volume Q of the range hoods on each floor i Average value of actual exhaust volume of range hoods on each floor The degree of deviation between i , where the average value of the i-th layer is and the degree of deviation b i The calculation formula is as follows:

[0068] S600, will b i The absolute value of |b i |Compared with the set value, when b i The absolute value of |b i |When it is not greater than a set value, it is judged that the adjustment of the i-th layer is successful, wherein the set value is not greater than 50%, preferably not greater than 40%, preferably not greater than 30%, preferably not greater than 20%, preferably not greater than 10%, or even not greater than 5%.

[0069] In some cases, in the actual exhaust pipe network system, due to the actual exhaust volume Q of the range hood 6 on each floor i Affected by various factors such as ambient temperature, flue gas temperature, ambient atmospheric pressure, actual pressure head loss of each component in the exhaust pipe network system, etc., in step S600, i The absolute value of |b i |When it is greater than the above set value, perform the following steps:

[0070] S700, according to the following formula: k′ i =k i (1+b i ) Calculate k′ i , and then adjust the opening of the butterfly valve 12 of the i-th layer to k' i .

[0071] In some cases, after step S700, when steps S500 and S600 are performed again, it is found that |b′ of the i-th layer i | is still greater than the set value, perform the following steps:

[0072] S800, when b′ i <0, that is, when the actual exhaust volume of the i-th floor is greater than the average value, according to the following formula: k″ i = k′ i (1+b′ i ) Calculate k″ i , and then adjust the opening of the air volume control valve on the i-th floor to k″ i ;or

[0073] S900, when b′ i>0, that is, when the actual exhaust volume of the i-th floor is less than the average value, it is judged that one or more of the exhaust device, air volume adjustment device and exhaust duct shaft air inlet of the i-th floor has a problem of poor exhaust.

[0074] The differential pressure measuring device according to the present invention includes a differential pressure gauge and an adapter seat that can be connected or separated by convenient plug-in and pull-out operations. When it is necessary to deploy equipment based on static pressure or differential pressure measurement (such as flow meters, etc.) on a large scale, the adapter seat can be connected to the equipment only, and a small number of portable differential pressure gauges can be used to measure static pressure or differential pressure through the adapter seat when necessary, thereby significantly reducing the number of differential pressure gauges and saving a large amount of equipment deployment costs, which is particularly beneficial in situations where expensive high-precision, multifunctional advanced differential pressure gauges are required. Therefore, the air volume regulating device of the present invention including the above-mentioned differential pressure measuring device can be advantageously deployed on a large scale in the exhaust pipe network system of multi-story buildings, thereby realizing the measurement and control of the actual air volume discharged into the exhaust duct shaft by exhaust devices such as exhaust fans or range hoods, so that the air volume discharged into the exhaust duct shaft of each floor of the multi-story building is roughly the same, effectively solving the problem of smoke backflow caused by small actual exhaust volume or even inability to exhaust in the lower floors of a multi-story building.

[0075] According to the method of adjusting the exhaust air volume of each floor in the exhaust pipe network system of the present invention, in the process of adjusting the exhaust air volume of each floor in a multi-story building to be approximately the same, the number of times of repeatedly going up and down the stairs for measurement and adjustment can be significantly reduced, the adjustment efficiency is significantly improved, and the physical exertion of the debugging personnel is greatly reduced.

[0076] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for adjusting air volume in a multi-power source exhaust system, comprising the following steps: S000, provides a multi-power source exhaust system for a multi-story building, comprising an exhaust duct shaft running through each floor of the multi-story building, the exhaust duct shaft is provided with an air inlet at each floor and a total air outlet at the top, each floor of the multi-story building is provided with an exhaust device with an independent power source, the exhaust port of the exhaust device is fluidly connected with the air inlet of the exhaust duct shaft through an exhaust pipe, an air volume measuring device for measuring the actual exhaust volume of the exhaust device and an air volume regulating valve for controlling the actual exhaust volume are provided in the exhaust pipe, and a static pressure measuring device is provided in the exhaust pipe or at the air inlet of the exhaust duct shaft to measure the relative static pressure that the exhaust devices on each floor need to overcome; S100, starting the exhaust device of each floor of the multi-story building and adjusting its exhaust power to the maximum or adjusting its exhaust gear to the highest, and adjusting the opening of the air volume regulating valve of each floor to the maximum, wherein the opening refers to the ratio of the air volume of the air volume regulating valve at the opening to the air volume at the maximum opening; S200, use the static pressure measuring device to measure the relative static pressure ΔP of each layer i , where i represents the number of layers, which is an integer from 1 to n, the first layer is the lowest layer, and the nth layer is the highest layer; S300, calculate ΔP of each layer i / ΔP1 ratio k i , where ΔP i is the relative static pressure of the i-th layer, ΔP1 is the relative static pressure of the 1st layer; S400, adjust the opening of the air volume control valve of each floor to the corresponding k i ; S500, after step S400, use the air volume measuring device of each floor to measure the actual exhaust volume Q of the exhaust device of each floor i , and then calculate the actual exhaust volume Q of each floor exhaust device i The average value of actual exhaust volume of exhaust devices on each floor The degree of deviation between , where the i-th layer and The calculation formula is as follows: , ; S600, The absolute value of Compared with the set value, when The absolute value of When the air volume of the i-th layer is not greater than the set value, it is judged that the air volume adjustment of the i-th layer is successful, wherein the set value is not greater than 50%; when When it is greater than the above set value, perform the following steps: S700, Computing , and then adjust the opening of the air volume control valve on the i-th floor to ; Among them, after step S700, steps S500 and S600 are performed again. If the i-th layer If it is still greater than the set value, perform the following steps: S800, when When <0, calculate , and then adjust the opening of the air volume control valve on the i-th floor to ;or S900, when >0, it is determined that one or more of the exhaust device, the air volume adjustment device and the air inlet of the exhaust duct shaft of the i-th layer is faulty.

2. The air volume adjustment method for a multi-power source exhaust system according to claim 1, wherein when The absolute value of When the air volume is not greater than a set value, it is determined that the air volume adjustment of the i-th layer is successful, wherein the set value is not greater than 40%.

3. The air volume adjustment method for a multi-power source exhaust system according to claim 1, wherein when The absolute value of When the air volume is not greater than a set value, it is determined that the air volume adjustment of the i-th layer is successful, wherein the set value is not greater than 30%.

4. The air volume adjustment method for a multi-power source exhaust system according to claim 1, wherein The absolute value of When the air volume is not greater than a set value, it is determined that the air volume adjustment of the i-th layer is successful, wherein the set value is not greater than 20%.

5. The air volume adjustment method for a multi-power source exhaust system according to claim 1, wherein when The absolute value of When the air volume is not greater than a set value, it is determined that the air volume adjustment of the i-th layer is successful, wherein the set value is not greater than 5%.

6. The air volume adjustment method for a multi-power source exhaust system according to claim 1, wherein when The absolute value of When the air volume is not greater than a set value, it is determined that the air volume adjustment of the i-th layer is successful, wherein the set value is not greater than 2%.

7. The air volume adjustment method for a multi-power source exhaust system according to claim 1, wherein when The absolute value of When the air volume is not greater than a set value, it is determined that the air volume adjustment of the i-th layer is successful, wherein the set value is not greater than 1%.

8. The air volume adjustment method for a multi-power source exhaust system according to any one of claims 1 to 7, wherein in step S200, the relative static pressure ΔP i is the relative static pressure ΔP of the upstream pressure tapping hole of the orifice flowmeter 上i Or the relative static pressure ΔP of the downstream pressure tapping hole 下i , or the relative static pressure ΔP at the air inlet of the exhaust shaft 井i , where i represents the number of layers, which is an integer from 1 to n, with the 1st layer being the lowest layer and the nth layer being the highest layer.

9. The air volume adjustment method for a multi-power source exhaust system according to any one of claims 1 to 7, wherein in step S300, the relative static pressure ΔP of each layer is i The data is smoothed, and then the smoothed ΔP of each layer is used i Data calculation of ΔP of each layer i / ΔP1 ratio k i .

10. The air volume adjustment method for a multi-power source exhaust system according to claim 8, wherein in step S300, the relative static pressure ΔP of each layer is i The data is smoothed, and then the smoothed ΔP of each layer is used i Data calculation of ΔP of each layer i / ΔP1 ratio k i .

11. The air volume regulation method of the multi-power source exhaust system according to any one of claims 1 to 7, wherein the air volume measuring device is an orifice flowmeter, and the pressure port of the static pressure measuring device is the upstream pressure port or the downstream pressure port of the orifice flowmeter, or is arranged in the exhaust duct shaft 10 to 50 cm below the air inlet.

12. The air volume adjustment method of the multi-power source exhaust system according to any one of claims 1 to 7, wherein: The air volume regulating valve regulates the air volume by changing its ventilation cross section.

13. The air volume regulating method of the multi-power source exhaust system according to claim 12, wherein the air volume regulating valve is a butterfly valve.

14. The air volume adjustment method of the multi-power source exhaust system according to any one of claims 1 to 7, wherein the exhaust device is a range hood or an exhaust fan or an exhaust blower.

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