WO2023185738A1 - 一种可精确测量风量的风量调节阀 - Google Patents

一种可精确测量风量的风量调节阀 Download PDF

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Publication number
WO2023185738A1
WO2023185738A1 PCT/CN2023/084095 CN2023084095W WO2023185738A1 WO 2023185738 A1 WO2023185738 A1 WO 2023185738A1 CN 2023084095 W CN2023084095 W CN 2023084095W WO 2023185738 A1 WO2023185738 A1 WO 2023185738A1
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Prior art keywords
air volume
orifice plate
upstream
downstream
regulating valve
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PCT/CN2023/084095
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English (en)
French (fr)
Inventor
董林
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同舟蓝海(北京)控股有限公司
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Publication of WO2023185738A1 publication Critical patent/WO2023185738A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/75—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity for maintaining constant air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/40—Pressure, e.g. wind pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates to the technical field of air conditioning and ventilation, and in particular to an air volume regulating valve that can accurately measure air volume.
  • Some production and experimental facilities such as pharmaceutical and biological product production workshops, experimental animal breeding rooms, hospital operating rooms, and medical, biological, chemical and chemical laboratories, need to accurately adjust the air supply or exhaust (return) of the room's air conditioning and ventilation systems. ) air volume, thereby maintaining a stable pressure gradient in the room (area), achieving air cleanliness and controlling pollution risks, thereby ensuring product (sample) quality, personnel and environmental safety, and meeting the requirements of relevant regulations.
  • type A control valve a circular or rectangular valve body, equipped with a single-leaf or multi-leaf control valve, and equipped with air volume sensors, electric actuators and controllers (hereinafter referred to as type A control valve) ), the air volume is adjusted by changing the angle of the blade; b)
  • the valve body in the form of a circular venturi tube can maintain the set air volume through the built-in conical valve core and the connected mechanical mechanism (hereinafter referred to as the B-type regulating valve), and The air volume can be adjusted through an external electric actuator.
  • the air volume measurement and control accuracy of the A-type control valve is affected by the local resistance components (such as elbows, tees) upstream of the valve.
  • the control valve requires a certain length of straight pipe section upstream (such as 3-5 times the valve body pipe diameter length) to ensure engineering measurement and control accuracy.
  • Tables 1 and 2 respectively show the air volume control conditions downstream of elbows and tees of this type of regulating valve with a diameter of 200mm from a certain brand without a straight pipe section.
  • the actual air volume is its stable average value. It can be found that the maximum deviation exceeds the standard value by 10%, and the minimum deviation also exceeds 4%.
  • Table 3 shows the performance of the same air valve when it meets the straight pipe length requirement of 5 times the valve body diameter upstream. It can be seen that a long enough straight pipe section greatly improves the control performance of the damper.
  • the elbow is a circle with a diameter of 200mm, bent at 90°, and the bending radius of the axis is 200mm.
  • Table 2 Measured air volume control performance of a type A air volume control valve with a diameter of 200mm installed downstream of the tee branch (no straight pipe section)
  • the tee is a circular Y-shaped shunt tee, the straight path pipe diameter is 250mm, and the branch pipe diameter is 200mm.
  • Type B control valve does not impose requirements on the length of the upstream straight pipe section, but the air volume control valve only has a certain pressure difference between the front and rear in order for its mechanical mechanism to work properly and maintain the set air volume function. Even for a small air volume, the starting pressure difference usually needs to be about 100Pa.
  • a well-known brand product requires a minimum working pressure difference of 150Pa in commonly used medium-pressure systems.
  • the normal operating pressure difference of the air volume regulating valve needs to be larger. The greater the pressure difference, the greater the energy consumption of the fan.
  • the technical problem to be solved by the present invention is to provide an air volume regulating valve that can achieve accurate measurement and control of air volume without requiring upstream straight pipe length and requiring small working pressure difference, thereby overcoming the shortcomings of the existing technology.
  • the present invention adopts the following technical solutions:
  • An air volume regulating valve that can accurately measure air volume, including a circular tubular valve body and a valve plate and an orifice plate installed in the circular tubular valve body; the orifice plate is located upstream of the valve plate, and there are two valves upstream and downstream of the orifice plate.
  • the upstream pressure port and the downstream pressure port are both 0.5 times the pipe diameter from the orifice plate, and the valve plate is located downstream of the downstream pressure port; in the circular tubular valve body
  • a tapered pipe fitting is also installed on the air inlet side. The tapered pipe fitting is located at 1 times the pipe diameter upstream of the orifice plate and is tapered along the air flow direction.
  • the present invention also includes a pressure difference detection board, a single-chip microcomputer control board and an actuator; the pressure difference detection board is connected to the upstream pressure port and the downstream pressure port through the upstream pressure pipe and the downstream pressure pipe respectively; The pressure difference detection board is connected to the single-chip computer control board, the single-chip computer control board is connected to the actuator, and the actuator is used to control the action of the valve plate.
  • the inner hole of the orifice plate is a circular hole, and the inner hole diameter is 0.2-0.8 times the pipe diameter.
  • the included angle of the pipe wall of the tapered pipe fitting is 5-30 degrees.
  • a gradually expanding pipe fitting is installed on the air outlet side of the circular tubular valve body, which is gradually expanded along the direction of air flow.
  • the circular tubular valve body is divided into an air volume measurement section and an air volume adjustment section; the air volume measurement section is centered on the orifice plate, and the length is 2 times the pipe diameter; the air volume adjustment section is centered on the installation axis of the valve plate. .
  • a protective shell is set outside the orifice plate, the round tubular valve body at the upstream pressure port and the downstream pressure port, and the pressure difference detection board, single chip microcomputer control board, upstream pressure pipe and downstream The pressure pipe is located in the protective shell.
  • the diameter of the circular tubular valve body is 150mm, 200mm, 250mm, 300mm or 400mm.
  • valve plate is a single-leaf or multi-leaf regulating valve plate.
  • the present invention at least has the following advantages:
  • the air volume regulating valve of the present invention is provided with an orifice plate upstream of the valve plate and a tapered pipe fitting on the air inlet side of the circular tubular valve body, and is provided with upstream and downstream pressure ports at 0.5 times the pipe diameter downstream of the orifice plate. Even if there is no straight pipe section upstream, the air volume measurement error within the designed air volume range can also be achieved within the design air volume range, which can meet the air volume measurement accuracy requirements of general air conditioning and ventilation projects and create conditions for air volume adjustment and control. , the requirement for the pressure difference between the front and rear of the air volume regulating valve is low.
  • Figure 1 is a schematic cross-sectional structural diagram of an air volume regulating valve according to an embodiment of the present invention (the arrow indicates the direction of air flow);
  • Figure 2 is a perspective structural schematic diagram of the air volume regulating valve according to an embodiment of the present invention.
  • Figure 3 is a front view of the air volume regulating valve according to an embodiment of the present invention.
  • Fig. 4 is an enlarged view of part A in Fig. 1 .
  • the overall design concept of the present invention is to set an orifice plate in the air volume regulating valve and cooperate with the tapered pipe fittings upstream of the orifice plate, and at the same time set the positions of its upstream and downstream pressure ports, so that there is no requirement for the length of the straight pipe section upstream during installation and the A small working pressure difference is required to achieve precise measurement and control of air volume.
  • any rigid resistance component in a gas pipeline such as an orifice plate or nozzle, can establish a corresponding relationship between its pressure drop and gas flow, thereby achieving the measurement of air volume.
  • practical applications must strictly meet certain conditions to achieve measurement accuracy and consistency.
  • the minimum distance between the upstream elbow of the orifice plate and the straight pipe section of the orifice plate is 3 times the pipe diameter (when the diameter ratio of the inner diameter of the orifice plate to the diameter of the air duct is less than or equal to 0.20), When the diameter ratio is 0.75, the straight pipe section must be at least 20 times the pipe diameter.
  • the standard also puts forward requirements for the position of the pressure taps before and after the orifice plate, that is, the distance between the upstream pressure tap and the orifice plate is 1 times the pipe diameter, and the downstream pressure tap is 0.5 times the pipe diameter. Due to very strict requirements, orifice flow meters are only used as aerodynamic test devices in air-conditioning and ventilation system applications and cannot be used as a means of air volume measurement in building engineering systems.
  • the present invention applies the above-mentioned orifice plate to the air volume regulating valve through adjustment, as shown in Figure 1-4:
  • This embodiment provides an air volume regulating valve that can accurately measure air volume, including a circular tubular valve body 1.
  • the circular tubular valve body 1 can adopt different pipe diameters according to needs.
  • the pipe diameter D can be 150mm, 200mm, 250mm, 300mm or 400mm.
  • a valve plate 2 is installed in the circular tubular valve body 1.
  • the valve plate 2 is a single-leaf or multi-leaf regulating valve plate, which can rotate along the installation axis 21 to adjust the air volume.
  • An orifice plate 3 is also installed in the circular tubular valve body 1.
  • the orifice plate 3 is located upstream of the valve plate 2.
  • An upstream pressure port 4 and a downstream pressure port 5 are respectively provided upstream and downstream of the orifice plate 3.
  • the distance between the upstream pressure port 4 and the downstream pressure port 5 is 0.5 times the pipe diameter from the orifice plate 3.
  • the valve plate 2 is located at the downstream port. Downstream of pressure port 5.
  • a tapered pipe fitting 6 is also installed on the air inlet side of the circular tubular valve body 1.
  • the tapered pipe fitting 6 is located at 1 times the pipe diameter upstream of the orifice plate 3 and is tapered along the air flow direction.
  • the pipe wall clip of the tapered pipe fitting 6 is The angle ⁇ is preferably 10-30 degrees, and the tapered pipe 6 can be changed from a rectangular shape to a circular shape, or from a circular shape to a circular shape.
  • a gradually expanding pipe fitting 7 is also installed on the air outlet side of the circular tubular valve body 1, which has a gradually expanding shape along the air flow direction. Since the pipe diameters of the air ducts are the same, the outer diameters of both ends of the air volume regulating valve should also be the same.
  • the gradually expanding pipe fitting 7 is mainly used to cooperate with the tapering pipe fitting 6 to achieve connection with the downstream air duct.
  • the circular tubular valve body 1 of the above-mentioned air volume regulating valve can be divided into two sections, which are divided into an air volume measurement section and an air volume adjustment section.
  • the air volume measurement section is centered on the orifice plate 3 and has a length of 2 times the pipe diameter (2D); the air volume adjustment section is The mounting axis 21 of the valve plate 2 is the center, and the length is L.
  • the above-mentioned air volume regulating valve also includes a pressure difference detection board 8, a single-chip microcomputer control board 9 and an actuator 10; the pressure difference detection board 8 is connected to the upstream pressure port 4 and the downstream pressure port 4 through the upstream pressure pipe 11 and the downstream pressure pipe 12 respectively. Pressure port 5; pressure difference detection board 8 is connected to the single-chip computer control board 9, and the single-chip computer control board 9 is connected to the actuator 10.
  • the actuator 10 is used to control the action of the valve plate 2.
  • the pressure tube 12 is located in the protective housing 13 .
  • the air volume regulating valve of the present invention can also achieve air volume measurement with an error of no more than 3% within the designed air volume range even if there is no straight pipe section upstream of the valve. It can meet the requirements for air volume measurement accuracy in general air conditioning and ventilation projects, and provides air volume measurement accuracy. Regulation and control create conditions.
  • Tables 4 and 5 respectively show the comparison of the air volume measurement values downstream of the elbow and tee of the air volume regulating valve with a diameter of 200 mm (the diameter of the circular tubular valve body) of the present invention and the measurement values of the sampling standard nozzle flow meter. It can be seen that the deviations from the standard air volume are less than 3%. Through experimental measurement, the measured data of the other four specifications of devices, with diameters of 150mm, 250mm, 300mm and 400mm respectively, within the designed air volume range show that the air volume measurement deviations are also less than 3%.
  • the performance of the air volume regulating valve with a diameter of 200 mm according to the present invention was tested downstream of the elbow and tee branch.
  • the stable average value and deviation are shown in Table 6 and Table 7, and the deviations are both less than 3%.
  • Table 7 Measured air volume control performance of the air valve with a diameter of 200mm according to the present invention installed downstream of the tee (without straight pipe section)
  • Table 9 Main specifications of the present invention: The inner hole diameter of the orifice plate 3 of the air volume regulating valve and the angle between the pipe walls of the tapered pipe fitting 6
  • the air volume regulating valve of the present invention is provided with an orifice plate upstream of the valve plate and a tapered pipe fitting on the air inlet side of the circular tubular valve body, and is provided with upper and lower pipes on the orifice plate and 0.5 times the pipe diameter downstream.
  • the downstream pressure port even if there is no straight pipe section upstream, can also achieve air volume measurement with an error of no more than 3% within the design air volume range. It can meet the requirements for air volume measurement accuracy in general air conditioning and ventilation projects, and provides air volume adjustment and Control creates conditions, and at the same time, the pressure difference between the front and rear of the air volume control valve is low, making it suitable for popularization and application.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
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Abstract

本发明公开了一种可精确测量风量的风量调节阀，包括圆管状阀体及安装在圆管状阀体内的阀片和孔板；所述孔板位于阀片上游，在孔板上游和下游分别设置有上游取压口和下游取压口，所述上游取压口与下游取压口距离孔板均为0.5倍管径，所述阀片位于下游取压口的下游；在所述圆管状阀体的进风口侧还安装有渐缩管件，所述渐缩管件位于孔板上游1倍管径处，沿气流方向呈渐缩状。本发明的风量调节阀，在其上游不具备直管段的情况下，也可以实现风量测量在设计风量范围内误差不超过3％，能够满足一般空调通风工程对风量测量精度的要求，并为风量调节和控制创造条件，同时，对风量调节阀前后压差要求较低。

Description

一种可精确测量风量的风量调节阀 技术领域
本发明涉及空调通风技术领域，特别是涉及一种可精确测量风量的风量调节阀。
背景技术
一些生产和实验设施，比如制药和生物制品的生产车间、实验动物饲养室、医院手术室、以及医学、生物、化工和化学实验室，需要精准调节房间的空调通风系统的送风或排(回)风量，进而维持稳定房间(区域)的压力梯度，实现空气洁净度和对污染风险的控制，从而保证产品(样品)质量、人员和环境安全，满足相关法规的要求。
即使房间和设施在静态能够满足风量和压差设计要求，但是在运行时，房间气密性的改变、房门的开关、局部排风设备运行工况的变化等等都会导致各房间的风量改变及压差的偏离和波动。这就需要空调通风系统的风量调节阀能在风量精确测量的基础上实现对设定风量的维持或调节。
目前，工程常用的风量调节阀有两种形式：a)圆形或矩形阀体，内装单叶或多叶调节阀片，并配置风量传感器、电动执行器和控制器(以下简称A型调节阀)，通过改变叶片的角度实现风量调节；b)圆形文丘里管形式的阀体，通过内装锥形阀芯、以及相连的机械机构(以下简称B型调节阀)可维持设定风量，亦可通过外配电动执行器实现风量调节。
在工程应用中，上述两种调节阀存在如下问题：
(1)A型调节阀的风量测量和控制精度受阀门上游局部阻力部件(如弯头、三通)的影响，通常调节阀都需要上游具备一定长度的直管段(如3-5倍阀体管径长度)，才能保证工程测量和控制精度。当工程现场空间受限而难以满足直管段长度要求时，风量测量和控制会出现较大偏差。表1和表2分别是某品牌直径200mm的这种类型调节阀在无直管段情况下在弯头和三通下游的风量控制状况，实际风量为其稳定平均值。可以发现，最大偏差超过标准值10％，最小偏差也超过4％。表3是同一风阀在满足其上游5倍阀体管径的直管段长度要求时的表现。可见，足够长的直管段极大改善了风阀的控制性能。
表1某A型结构直径200mm的风量调节阀安装在弯头1下游(无直管段)风量控制性能实测
注1：弯头为直径200mm圆形，弯曲90°，轴线的弯曲半径为200mm。
表2某A型结构直径200mm的风量调节阀安装在三通支路下游(无直管段)风量控制性能实测
注1：三通为圆形Y形分流三通，直通路管径250mm，支路管径为200mm。
表3某A型结构直径200mm的风量调节阀安装在三通下游(5倍直径直管段)风量控制性能实测
(2)B型调节阀没有对上游直管段长度提出要求，但是风量调节阀只有在前后具备一定的压差才能使其机械机构正常工作，才能实现维持设定风量的功能。即使是很小的风量，通常这个启动压差也需要100Pa左右。某知名品牌产品在常用的中压系统中要求最低工作压差为150Pa。为了适应系统的压力波动，风量调节阀正常工作压差还需要更大。压差越大，风机的能耗也越大。
由此可见，上述现有的风量调节阀，在结构与安装上，显然仍存在有不便与缺陷，而亟待加以进一步改进。如何能创设一种对上游无直管段长度要求并且对工作压差要求小的风量调节阀，成为当前业界极需改进的目标。
发明内容
本发明要解决的技术问题是提供一种风量调节阀，使其对上游无直管段长度要求并且对工作压差要求小即可实现风量的精确测量和控制，从而克服现有技术的不足。
为解决上述技术问题，本发明采用如下技术方案：
一种可精确测量风量的风量调节阀，包括圆管状阀体及安装在所述圆管状阀体内的阀片和孔板；所述孔板位于阀片上游，在孔板上游和下游分别设置有上游取压口和下游取压口，所述上游取压口与下游取压口距离孔板均为0.5倍管径，所述阀片位于下游取压口的下游；在所述圆管状阀体的进风口侧还安装有渐缩管件，所述渐缩管件位于孔板上游1倍管径处，沿气流方向呈渐缩状。
作为本发明的进一步改进，还包括压差检测板、单片机控制板及执行器；所述压差检测板分别通过上游取压管、下游取压管连接至上游取压口和下游取压口；所述压差检测板与单片机控制板连接，单片机控制板与执行器连接，执行器用于控制阀片动作。
进一步地，所述孔板的内孔为圆形孔，内孔直径为0.2-0.8倍管径。
进一步地，所述渐缩管件的管壁夹角为5-30度。
进一步地，所述圆管状阀体的出风口侧安装有渐扩管件，沿气流方向呈渐扩状。
进一步地，所述圆管状阀体分为风量测量段及风量调节段；所述风量测量段以孔板为中心，长度为2倍管径；所述风量调节段以阀片的安装轴为中心。
进一步地，在所述孔板、上游取压口与下游取压口处的圆管状阀体外侧还套设有保护壳体，所述压差检测板、单片机控制板、上游取压管和下游取压管位于保护壳体内。
进一步地，所述圆管状阀体的管径为150mm、200mm、250mm、300mm或400mm。
进一步地，所述阀片为单叶或多叶调节阀片。
通过采用上述技术方案，本发明至少具有以下优点：
本发明的风量调节阀，通过在阀片上游设置孔板以及在圆管状阀体的进风口侧安装渐缩管件，并在孔板上、下游0.5倍管径处设置上、下游取压口，在其上游不具备直管段的情况下，也可以实现风量测量在设计风量范围内误差不超过3％，能够满足一般空调通风工程对风量测量精度的要求，并为风量调节和控制创造条件，同时，对风量调节阀前后压差要求较低。
附图说明
上述仅是本发明技术方案的概述，为了能够更清楚了解本发明的技术手段，以下结合附图与具体实施方式对本发明作进一步的详细说明。
图1是本发明的一实施例中风量调节阀的剖视结构示意图(箭头为气流方向)；
图2是本发明的一实施例中风量调节阀的透视结构示意图；
图3是本发明的一实施例中风量调节阀的正视图；
图4是图1中的A部放大图。
具体实施方式
下面将参照附图更详细地描述本发明的示例性实施例。虽然附图中显示了本发明的示例性实施例，然而应当理解，可以以各种形式实现本发明而不应被这里阐述的实施例所限制。相反，提供这些实施例是为了能够更透彻地理解本发明，并且能够将本发明的范围完整的传达给本领域技术人员。
本发明整体设计构思是在风量调节阀内设置孔板并配合孔板上游的渐缩管件，同时设定其上、下游取压口的位置，使其安装时对上游无直管段长度要求并且对工作压差要求小即可实现风量的精确测量和控制。
在流体力学的理论上，气体管道内任一刚性阻力部件，如孔板或喷嘴，都可以建立其压降与气体流量的对应关系，从而实现风量的测量。但是，实际应用必须严格满足一定的条件才能实现测量精度和一致性。国家标准GB/T2624.2-2006《用安装在圆形截面管道中的差压装置测量满管流体流量第2部分：孔板》(等同采用国际标准ISO5167-2:2003Measurement of fluid flow by means of pressure differential devicesinserted in circular cross-section conduits running full–Part 2:Orificeplates)中，其中的表3给出了无流动调整器情况下孔 板与管件之间所需直管段的要求，比如孔板上游弯头距离孔板的直管段长度最小距离是3倍管径(当孔板内径与风道直径的直径比小于等于0.20时)，而对于直径比为0.75时，直管段至少要达到20倍管径。该标准中对孔板前后取压口位置也提出要求，即孔板上游取压口距离孔板为1倍管径，下游取压口为0.5倍管径。由于要求非常严格，在空调通风系统应用中，孔板流量计仅作为空气动力试验装置使用，无法在建筑工程系统中作为风量测量的手段。
而本发明将上述孔板通过调整应用于风量调节阀中，具体如图1-4所示：
本实施例提供一种可精确测量风量的风量调节阀，包括圆管状阀体1，圆管状阀体1可根据需要采用不同管径，如管径D可为150mm、200mm、250mm、300mm或400mm。在圆管状阀体1内安装有阀片2，阀片2为单叶或多叶调节阀片，其可沿安装轴21旋转调节风量。
在圆管状阀体1内还安装有孔板3，孔板3位于阀片2上游，孔板3的内孔为圆形孔，内孔直径d为0.2-0.8倍管径(d＝0.2D-0.8D)，配合图4所示，孔板3开孔处可为圆角，斜角或无倒角也均可。在孔板3上游和下游分别设置有上游取压口4和下游取压口5，上游取压口4与下游取压口5距离孔板3均为0.5倍管径，阀片2位于下游取压口5的下游。
在圆管状阀体1的进风口侧还安装有渐缩管件6，渐缩管件6位于孔板3上游1倍管径处，沿气流方向呈渐缩状，上述渐缩管件6的管壁夹角α优选为10-30度，渐缩管件6可以是矩形变为圆形，也可以是圆形变为圆形。
在圆管状阀体1的出风口侧还安装有渐扩管件7，其沿气流方向呈渐扩状。由于风道的管径相同，因此，风量调节阀的两端外径也应相同，渐扩管件7主要是为了配合渐缩管件6实现与下游风道连接。
上述风量调节阀的圆管状阀体1可分为两段，分为风量测量段及风量调节段，风量测量段以孔板3为中心，长度为2倍管径(2D)；风量调节段以阀片2的安装轴21为中心，长度为L。
上述风量调节阀，还包括压差检测板8、单片机控制板9及执行器10；压差检测板8分别通过上游取压管11、下游取压管12连接至上游取压口4和下游取压口5；压差检测板8与单片机控制板9连接，单片机控制板9与执行器10连接，执行器10用于控制阀片2动作。
在孔板3、上游取压口4与下游取压口5处的圆管状阀体外侧还套设有保护壳体13，压差检测板8、单片机控制板9、上游取压管11和下游取压管12位于保护壳体13内。
本发明的风量调节阀，在其上游不具备直管段的情况下，也可以实现风量测量在设计风量范围内误差不超过3％，能够满足一般空调通风工程对风量测量精度的要求，并为风量调节和控制创造条件。
表4和表5分别为本发明规格为200mm直径(圆管状阀体的管径)的风量调节阀在弯头和三通下游风量测量值与采样标准喷嘴流量计测量值的对照。可见，与标准风量的偏差均小于3％。而通过实验测定，其他4个规格装置，直径分别为150mm、250mm、300mm和400mm，在设计风量范围内实测数据显示其风量测量偏差也均小于3％。
表4本发明直径为200mm的风量调节阀在弯头下游(无直管段)风量测量值与标准风量对照

表5本发明直径为200mm的风量调节阀在三通支路下游(无直管段)风量测量值与标准风量对照

本发明直径200mm规格的风量调节阀，对其进行了在弯头和三通支路下游的性能进行了测试，稳定平均值及偏差见表6和表7，偏差均小于3％。
表6本发明直径200mm的风量调节阀安装在弯头下游(无直管段)风量控制性能实测
表7本发明直径200mm的风阀安装在三通下游(无直管段)风量控制性能实测
另外，通过测试，本发明各主要规格风量调节阀的推荐工作风量范围及对应的压降，如表8所示。
表8本发明主要规格风量调节阀的推荐风量范围及对应压降
上述表4-表8均是以表9数据的风量调节阀进行测试的结果。
表9本发明主要规格风量调节阀的孔板3的内孔直径和渐缩管件6的管壁夹角
经过测试验证，在孔板3的内孔直径d为0.2-0.8倍管径(d＝0.2D-0.8D)， 渐缩管件6的管壁夹角为5-30度之间均能获得类似的效果。
综上所述，本发明的风量调节阀，通过在阀片上游设置孔板以及在圆管状阀体的进风口侧安装渐缩管件，并在孔板上、下游0.5倍管径处设置上、下游取压口，在其上游不具备直管段的情况下，也可以实现风量测量在设计风量范围内误差不超过3％，能够满足一般空调通风工程对风量测量精度的要求，并为风量调节和控制创造条件，同时，对风量调节阀前后压差要求较低，适于推广应用。
以上所述，仅是本发明的较佳实施例而已，并非对本发明作任何形式上的限制，本领域技术人员利用上述揭示的技术内容做出些许简单修改、等同变化或修饰，均落在本发明的保护范围内。

Claims (9)

  1. 一种可精确测量风量的风量调节阀，其特征在于，包括圆管状阀体及安装在所述圆管状阀体内的阀片和孔板；
    所述孔板位于阀片上游，在孔板上游和下游分别设置有上游取压口和下游取压口，所述上游取压口与下游取压口距离孔板均为0.5倍管径，所述阀片位于下游取压口的下游；
    在所述圆管状阀体的进风口侧还安装有渐缩管件，所述渐缩管件位于孔板上游1倍管径处，沿气流方向呈渐缩状。
  2. 根据权利要求1所述的可精确测量风量的风量调节阀，其特征在于，还包括压差检测板、单片机控制板及执行器；
    所述压差检测板分别通过上游取压管、下游取压管连接至上游取压口和下游取压口；所述压差检测板与单片机控制板连接，单片机控制板与执行器连接，执行器用于控制阀片动作。
  3. 根据权利要求1所述的可精确测量风量的风量调节阀，其特征在于，所述孔板的内孔为圆形孔，内孔直径为0.2-0.8倍管径。
  4. 根据权利要求1-3任一项所述的可精确测量风量的风量调节阀，其特征在于，所述渐缩管件的管壁夹角为5-30度。
  5. 根据权利要求4所述的可精确测量风量的风量调节阀，其特征在于，所述圆管状阀体的出风口侧安装有渐扩管件，沿气流方向呈渐扩状。
  6. 根据权利要求1-3任一项所述的可精确测量风量的风量调节阀，其特征在于，所述圆管状阀体分为风量测量段及风量调节段；所述风量测量段以孔板为中心，长度为2倍管径；所述风量调节段以阀片的安装轴为中心。
  7. 根据权利要求2所述的可精确测量风量的风量调节阀，其特征在于，在所述孔板、上游取压口与下游取压口处的圆管状阀体外侧还套设有保护壳体，所述压差检测板、单片机控制板、上游取压管和下游取压管位于保护壳体内。
  8. 根据权利要求1-3任一项所述的可精确测量风量的风量调节阀，其特征在于，所述圆管状阀体的管径为150mm、200mm、250mm、300mm或400mm。
  9. 根据权利要求1-3任一项所述的可精确测量风量的风量调节阀，其特征在于，所述阀片为单叶或多叶调节阀片。
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