WO2022155813A1 - 远传压差变送器及调零方法 - Google Patents

远传压差变送器及调零方法 Download PDF

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Publication number
WO2022155813A1
WO2022155813A1 PCT/CN2021/072868 CN2021072868W WO2022155813A1 WO 2022155813 A1 WO2022155813 A1 WO 2022155813A1 CN 2021072868 W CN2021072868 W CN 2021072868W WO 2022155813 A1 WO2022155813 A1 WO 2022155813A1
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WO
WIPO (PCT)
Prior art keywords
storage cavity
adjustment
differential pressure
value
pressure transmitter
Prior art date
Application number
PCT/CN2021/072868
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English (en)
French (fr)
Inventor
苏怡华
祁明辉
Original Assignee
深圳市特安电子有限公司
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Application filed by 深圳市特安电子有限公司 filed Critical 深圳市特安电子有限公司
Priority to PCT/CN2021/072868 priority Critical patent/WO2022155813A1/zh
Publication of WO2022155813A1 publication Critical patent/WO2022155813A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
    • G01L13/02—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure

Definitions

  • the present application relates to the technical field of industrial automatic control equipment, and more particularly, to a remote transmission differential pressure transmitter and a zero adjustment method.
  • Differential pressure is the difference between any two measured pressures, which involves the force balance between the high-pressure side and the low-pressure side of the instrument itself, but the difference between the two sides cannot be completely eliminated in actual production, which requires Zero adjustment to correct and eliminate errors.
  • the zero adjustment method of such instruments on the market is realized by electronic hardware (controller) and software programming. The measurement result is obtained by subtracting the error value from the data.
  • One of the purposes of the embodiments of the present application is to provide a remote differential pressure transmitter and a zero-adjusting method, aiming to solve the problem that the remote differential pressure transmitter in the prior art is realized by software and hardware intelligent control, and its principle is to assume that the instrument The error value itself is fixed, and it is only processed from the displayed data.
  • the difference in oil filling amount and shape on both sides of the meter makes the error value different at different temperatures, resulting in the high and low pressure of the meter itself.
  • the difference between the sides is not a linear relationship, a technical problem with low measurement accuracy.
  • a remote differential pressure transmitter including:
  • the transmitter body includes a high pressure side storage cavity and a low pressure side storage cavity, and the control display device is used to obtain the high pressure side storage cavity and the low pressure side.
  • the pressure value of the side storage cavity; the remote differential pressure transmitter also includes:
  • a bellows wherein a first storage cavity communicated with the low-pressure side storage cavity and a second storage cavity communicated with the first storage cavity are arranged in the bellows;
  • An adjustment device the adjustment device includes a first adjustment assembly and a second adjustment assembly respectively disposed on the diaphragm box, the first adjustment assembly is used to adjust the volume of the first storage cavity and the second adjustment assembly The volume of the storage cavity, and the second adjustment component is used to control the communication and closing between the first storage cavity and the second storage cavity.
  • the first adjustment assembly includes adjustment shafts respectively disposed in the first storage cavity and the second storage cavity;
  • top ring is sleeved on the adjustment shaft, and the top ring abuts against the ends of the first storage cavity and the second storage cavity.
  • the first adjustment assembly further includes a sealing ring, and the sealing ring is attached between the top ring and the ends of the first storage cavity and the second storage cavity.
  • the first adjustment assembly further includes a tightening ring, the tightening ring is sleeved on the adjustment shaft, and the tightening ring is provided with a first connecting portion, and the top ring is provided with a first connecting portion.
  • a second connecting part the first connecting part is connected with the second connecting part for locking the rotation of the adjusting shaft.
  • a rotation opening is provided on one end of the fastening ring near the outer side of the diaphragm box.
  • a rotating head is provided on the outer end of the adjusting shaft close to the diaphragm box.
  • the rotary head is a square head; or a font opening is provided on the rotary head; or
  • a cross-shaped opening is formed on the rotating head.
  • the rotating head is provided with a square hole or a polygon hole.
  • the second adjustment assembly includes:
  • an adjustment seat wherein an installation cavity is arranged in the adjustment seat and is arranged in the diaphragm box;
  • the regulating valve core is rotatably arranged in the installation cavity, and one end of the regulating valve core abuts against the connection between the first storage cavity and the second storage cavity, so The other end of the regulating valve core is close to the outside of the bellows, and the other end of the regulating valve core is provided with a rotating head.
  • the capsule is provided with a cavity communicating with the second storage cavity, and the cavity is provided at the connection between the first storage cavity and the second storage cavity ;
  • the adjusting seat includes:
  • sealing ring is attached to the open end of the cavity
  • a fixing ring the fixing ring is provided with a pressing ring connected with the sealing ring, and a rotating port is arranged on the outer end of the fixing ring close to the bellows.
  • a sealing member is disposed between the sealing ring and the open end, and the sealing member is used to seal the connection between the sealing ring and the cavity.
  • the present application also provides a zero adjustment method for the remote differential pressure transmitter described in any of the above embodiments, comprising the steps of:
  • step S3 it also includes steps:
  • the zero adjustment method further comprises the steps of:
  • Step S4 Step S1, Step S2 and Step S3 are repeated under the current temperature value of the first temperature value t 1 , the second temperature value t 2 , the third temperature value t 3 . « the nth temperature value t n respectively, and record
  • the preset values A 1 , A 2 , A 3 . . . An according to the formula:
  • k is the range accuracy of the remote differential pressure transmitter
  • t n is greater than t n-1
  • X is a constant
  • the beneficial effect of the remote differential pressure transmitter provided by the present application is that compared with the prior art, the remote differential pressure transmitter of the present application has a diaphragm box installed on the outside of the remote differential pressure transmitter body. And adjust the volume of the first storage cavity and the volume of the second storage cavity through the first adjustment component, and then adjust the error between the high-pressure side storage cavity and the low-pressure side storage cavity, so that the display value of the control display device can reach the real value. It eliminates the problem of low accuracy caused by the volume difference and temperature difference on both sides of the remote differential pressure transmitter, and improves the measurement accuracy of the product.
  • FIG. 1 is a schematic three-dimensional structure diagram of a remote differential pressure transmitter provided by an embodiment of the present application
  • Fig. 2 is a partial structural schematic diagram of a remote transmission differential pressure transmitter provided by an embodiment of the present application
  • Fig. 3 is the enlarged structural representation of A part in Fig. 2;
  • Fig. 4 is a perspective structural schematic diagram of a capsule of a remote differential pressure transmitter provided by an embodiment of the present application
  • Fig. 5 is the cross-sectional schematic diagram of the remote differential pressure transmitter in Fig. 4 along the B-B direction;
  • FIG. 6 is a schematic view of the structure of a remote differential pressure transmitter provided by an embodiment of the present application
  • Fig. 7 is the cross-sectional schematic diagram of the remote differential pressure transmitter in Fig. 6 along the C-C direction;
  • FIG. 8 is a schematic flowchart of a zero adjustment method provided by another embodiment of the present application.
  • FIG. 9 is another schematic flowchart of a zero adjustment method provided by another embodiment of the present application.
  • 1-transmitter body 2-control display device; 3-diaphragm box; 4-adjustment device;
  • first and second are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as “first” or “second” may expressly or implicitly include one or more of that feature.
  • plurality means two or more, unless otherwise expressly and specifically defined.
  • an embodiment of the present application provides a remote differential pressure transmitter, including a transmitter body 1 and a control and display device 2 , and a high-voltage side storage device is arranged in the transmitter body 1 A cavity and a low-pressure side storage cavity, the control display device 2 is used to obtain the pressure values of the high-pressure side storage cavity and the low-pressure side storage cavity;
  • the remote differential pressure transmitter also includes a diaphragm box 3 and the adjusting device 4, the capsule 3 is provided with a first storage cavity 31 in communication with the low-pressure side storage cavity and a second storage cavity 32 in communication with the first storage cavity 31;
  • the adjusting device 4 includes a first adjusting assembly 41 and a second adjusting assembly 42 respectively disposed on the membrane box 3, the first adjusting assembly 41 is used to adjust the volume of the first storage cavity 31 and the The volume of the second storage cavity 32 , and the second adjustment component 42 is used to control the communication and closing between the first storage cavity 31 and the second storage cavity 32 .
  • the bellows 3 is installed on the outer side of the remote differential pressure transmitter body 1, and the volume and the volume of the first storage cavity 31 are adjusted by the first adjustment component 41.
  • the volume of the second storage cavity 32 further adjusts the error between the high-pressure side storage cavity and the low-pressure side storage cavity, so that the displayed value of the control display device 2 reaches the real measured value, eliminating the need for a remote differential pressure transmitter.
  • the problem of low accuracy caused by the difference in volume and temperature on both sides improves the measurement accuracy of the product.
  • the first adjustment assembly 41 includes adjustment devices respectively disposed in the first storage cavity 31 and the second storage cavity 32
  • the shaft 411 and the top ring 412 , the top ring 412 is sleeved on the adjusting shaft 411 , and the top ring 412 abuts against the first storage cavity 31 and the second storage cavity 32 . Ends.
  • the adjustment shafts 411 located in the first storage cavity 31 and the second storage cavity 32 can be adjusted respectively.
  • the top ring 412 is used to seal the ends of the first storage cavity 31 and the second storage cavity 32 .
  • the first adjusting assembly 41 further includes a sealing ring 413 , and the sealing ring 413 is attached to the top ring 412 and the first storage ring 413 . between the cavity 31 and the end of the second storage cavity 32 .
  • the sealing ring 413 may be an O-ring 413 , which may be made of a rubber material to provide a sealing effect between the top ring 412 and the ends of the first storage cavity 31 and the second storage cavity 32 .
  • the first adjustment assembly 41 includes an adjustment shaft 411 and a top ring 412, as shown in FIG. 2 and FIG. 3 , the first adjustment assembly 41 further includes a fastening ring 414, the fastening ring 414 is sleeved on the adjusting shaft 411, and the fastening ring 414 is provided with a first connecting portion, the top ring 412 is provided with a second connecting portion, and the first connecting portion is connected to the second connecting portion.
  • the connecting portion is connected for locking the rotation of the adjusting shaft 411 .
  • the fastening ring 414 and the top ring 412 can be locked by tightening the two, so that the adjustment shaft 411 cannot be rotated. and the second connecting part can be matched with internal threads and external threads.
  • a rotation opening 415 is provided on the outer end of the fastening ring 414 close to the bellows 3 .
  • a plurality of rotating openings 415 can be provided at the end of the fastening ring 414 , and can be operated and rotated by a wrench designed to match with the rotating openings 415 .
  • the first adjustment assembly 41 includes an adjustment shaft 411 and a top ring 412 , on the adjustment shaft 411 close to the outer end of the bellows 3 is provided a rotary Head 416.
  • the rotary head 416 is a square head; or a font-shaped opening is provided on the rotary head 416; or
  • a cross-shaped opening is formed on the rotating head 416;
  • the rotating head 416 is provided with a square hole or a polygonal hole.
  • the design of the rotating head 416 can be adjusted by a flat-blade screwdriver, a cross-shaped screwdriver, or a wrench with a square head when adjusting the adjustment shaft 411, and no special tools are required for adjustment. make it more convenient to operate.
  • adjustment shaft 411 can also be connected to the adjustment shafts 411 of the first storage cavity 31 and the second storage cavity 32 through a servo motor through a synchronous pulley and two meshing gears, respectively, for driving adjustment, which is convenient for automatic control. .
  • the second adjustment assembly 42 includes an adjustment seat 421 to adjust the valve core 425 , specifically, the adjustment seat 421 is provided with an installation cavity, and is set in the bellows 3; the regulating valve core 425 is rotatably arranged in the installation cavity, and one end of the regulating valve core 425 abuts against the first storage At the connection between the cavity 31 and the second storage cavity 32 , the end of the regulating valve core 425 may be a tapered surface, which is convenient for sealing the connection between the first storage cavity and the second storage cavity 32 .
  • the other end of the regulating valve core 425 is close to the outside of the bellows 3, and the other end of the regulating valve core 425 is provided with a rotor 427, and the end of the rotor 427 near the outer side of the bellows 3 can be provided with a The character-shaped opening, the cross-shaped opening or the polygonal opening, etc
  • the capsule 3 is provided with a cavity 33 communicating with the second storage cavity 32 , and the cavity 33 is disposed in the first storage cavity 31 and the connection of the second storage cavity 32;
  • the adjusting seat 421 includes a sealing ring 422 and a fixing ring 423, the sealing ring 422 is attached to the open end of the cavity 33;
  • the fixing ring 423 A pressing ring 424 connected to the sealing ring 422 is provided, and a rotation port is provided on the outer end of the fixing ring 423 close to the bellows 3 .
  • the regulating valve core 425 can pass through the cavity 33 and can abut against the connection between the first storage cavity 31 and the second storage cavity 32.
  • the fixing ring 423 can be loosened by a wrench matched with the rotating port, and the That is, it is rotated to the outside of the diaphragm box 3 to withdraw a certain distance, and then the adjusting valve core 425 is withdrawn to the outside of the diaphragm box 3 by a certain distance through the tool that cooperates with the rotary head 426, so as to realize the first storage cavity and the second storage cavity. Communication of the storage cavity 32 .
  • a sealing member 426 is provided between the sealing ring 422 and the open end, and the sealing member 426 is used to seal the sealing ring 422 The connection with the cavity 33 .
  • the sealing member 426 can optionally use an O-ring 413, or other sealing gaskets. It is used to seal the connection between the sealing ring 422 and the cavity 33 to ensure the sealing effect.
  • the embodiments of the present application further provide a zero adjustment method for the remote differential pressure transmitter described in any of the above embodiments, which can
  • the high-pressure side storage cavity of the differential pressure transmitter is filled with oil, and when the pressure value displayed by the control display device 2 reaches the first preset pressure value, oil filling is stopped, and the high-pressure side storage cavity is closed;
  • the zero adjustment method includes steps:
  • the display value of the meter head of the control display device is a positive value (the first preset range value);
  • the meter head indicates a negative value.
  • Step S301 when the acquired display value of the control display device is a first preset range value (positive value), control the first adjustment component to make the oil in the second storage cavity flow to the first In the storage cavity, that is, by moving the tightening ring of the first adjustment component to the outside of the diaphragm box for a certain distance, and then using a tool such as a flat-blade screwdriver to withdraw the adjustment shaft of the second storage cavity for a certain distance, and then pass The flat-blade screwdriver advances the adjustment shaft located in the first storage cavity a certain distance in the direction of the bellows.
  • the display value of the control display device is a preset value
  • the adjustment can be stopped when the display value infinitely approaches the preset value.
  • the first adjustment assembly, and the first adjustment assembly and the second adjustment assembly are locked and fixed, and the adjustment valve core is advanced by a flat-blade screwdriver to close the gap between the first storage cavity and the second storage cavity. Connected, and then locked by the fixing ring;
  • Step S302 when the acquired display value of the control display device is a second preset range value (negative value), control the first adjustment component to make the oil in the first storage cavity flow to the second In the storage cavity, that is, by moving the fastening ring of the first adjustment assembly to the inner side of the bellows for a certain distance, and then using a tool such as a flat-blade screwdriver to advance the adjustment shaft of the second storage cavity for a certain distance, and then pass The flat-blade screwdriver withdraws the adjustment shaft located in the first storage cavity to the outside of the bellows by a certain distance.
  • the display value of the control display device is a preset value, it can be that the display value is infinitely close to the preset value.
  • the display value of the display device is a preset value
  • the adjustment of the first adjustment component is stopped, and the first adjustment component and the second adjustment component are locked and fixed.
  • the specific locking operation is the same as the above step S301. Not to repeat them one by one.
  • the zero adjustment method further includes the steps:
  • Step S4 Step S1, Step S2 and Step S3 are repeated under the current temperature value of the first temperature value t 1 , the second temperature value t 2 , the third temperature value t 3 . « the nth temperature value t n respectively, and record
  • the preset values A 1 , A 2 , A 3 . . . An according to the formula:
  • k is the range accuracy of the remote differential pressure transmitter
  • t n is greater than t n-1
  • X is a constant
  • step S1 For example, under the current temperature value of 15 ° C, 25 ° C, 35 ° C, do the above step S1, step S2 and step S3 experiments and record the data, respectively A 1 , A 2 and A 3 , select the remote pressure difference
  • the instrument range accuracy k of the transmitter is 0.2

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

一种远传压差变送器及调零方法，适用于工业自控设备技术领域，该远传压差变送器包括膜盒(3)和调节装置(4)，膜盒(3)内设有与低压侧储存腔体连通的第一储存腔体(31)和与第一储存腔体(31)连通的第二储存腔体(32)；调节装置(4)的第一调节组件(41)用于调节第一储存腔体(31)的容积和第二储存腔体(32)的容积，第二调节组件(42)用于控制第一储存腔体(31)和第二储存腔体(32)之间的连通和关闭。该远传压差变送器，通过第一调节组件(4)调节第一储存腔体(31)和第二储存腔体(32)的容积，调节高压侧与低压侧储存腔体之间的误差，消除了远传压差变送器两侧的体积差和温度差导致的精度低的问题。

Description

远传压差变送器及调零方法 技术领域
本申请涉及工业自控设备技术领域，更具体地说，是涉及一种远传压差变送器及调零方法。
 背景技术
远传远传压差变送器广泛应用于高温工业自控环境，其中以差压原理的远传远传压差变送器最为常用。差压即任意两个测量压力之间的差值，这就涉及到了仪表本身的高压侧和低压侧之间的力平衡，但实际生产中是无法完全消除两侧的差异的，这就需要通过调零来校正，消除误差。目前市场上此类仪表的调零方式是通过电子硬件（控制器）和软件编程来实现的，其原理是假定仪表本身的误差值是固定不变的，仅从显示数据上进行处理，测量的数据减去误差值即得到测量结果。然而实际上仪表两侧的灌油量差异和形状差异，使在不同温度下的误差值是不同的，导致仪表本身高低压侧之间的差值不是线性关系，测量精度低，因此其测量的结果是不准确的。
技术问题
本申请实施例的目的之一在于：提供一种远传压差变送器及调零方法，旨在解决现有技术中远传压差变送器通过软硬件智能控制实现，其原理是假定仪表本身的误差值是固定不变的，仅从显示数据上进行处理，然而实际上仪表两侧的灌油量差异和形状差异，使在不同温度下的误差值是不同的，导致仪表本身高低压侧之间的差值不是线性关系，测量精度低的技术问题。
 技术解决方案
为解决上述技术问题，本申请实施例采用的技术方案是：
第一方面，提供了一种远传压差变送器，包括：
包括变送器本体和控制显示装置，所述变送器本体内设置有高压侧储存腔体和低压侧储存腔体，所述控制显示装置用于获取所述高压侧储存腔体和所述低压侧储存腔体的压力值；所述远传压差变送器还包括：
膜盒，所述膜盒内设置有与所述低压侧储存腔体连通的第一储存腔体和与所述第一储存腔体连通的第二储存腔体；
调节装置，所述调节装置包括分别设置于所述膜盒上的第一调节组件和第二调节组件，所述第一调节组件用于调节所述第一储存腔体的容积和所述第二储存腔体的容积，所述第二调节组件用于控制所述第一储存腔体和所述第二储存腔体之间的连通和关闭。
在一个实施例中，所述第一调节组件包括分别设置于所述第一储存腔体和所述第二储存腔体的调节轴；
顶环，所述顶环套设于所述调节轴上，且所述顶环抵靠在所述第一储存腔体和所述第二储存腔体的端部。
进一步地，所述第一调节组件还包括密封圈，所述密封圈贴设于所述顶环与所述第一储存腔体和所述第二储存腔体的端部之间。
进一步地，所述第一调节组件还包括紧固环，所述紧固环套设于所述调节轴上，且所述紧固环上设置有第一连接部，所述顶环上设置有第二连接部，所述第一连接部与所述第二连接部连接，以用于锁定所述调节轴转动。
进一步地，所述紧固环上靠近所述膜盒的外侧一端设置有旋转开口。
进一步地，所述调节轴上靠近所述膜盒的外侧一端设置有旋转头。
进一步地，所述旋转头为方形头；或所述旋转头上开设有一字型开口；或
所述旋转头上开设有十字形开口；或
所述旋转头上设置有方形孔或多边形孔。
进一步地，所述第二调节组件包括：
调节座，所述调节座内设置有安装腔，并设置于所述膜盒内；
调节阀芯，所述调节阀芯转动地设置于所述安装腔内，且所述调节阀芯的一端抵靠于所述第一储存腔体和所述第二储存腔体的连接处，所述调节阀芯的另一端靠近所述膜盒的外侧，且在所述调节阀芯的另一端设置有转头。
在一个实施例中，所述膜盒上设置有与所述第二储存腔体连通的容腔，所述容腔设置于所述第一储存腔体和所述第二储存腔体的连接处；
所述调节座包括：
密封环，所述密封环贴设于所述容腔的开口端；
固定环，所述固定环设置有与所述密封环连接的压环，且所述固定环上靠近所述膜盒的外侧一端设置有旋转口。
在一个实施例中，所述密封环与所述开口端之间设置有密封件，所述密封件用于密封所述密封环与所述容腔的连接处。
本申请还提供了一种用于上述任一实施例所述的远传压差变送器的调零方法，包括步骤：
S1，调节远传压差变送器的第二调节组件，使第一储存腔体与第二储存腔体连通，实现低压侧储存腔体与所述第二储存腔体连通；
S2，获取当前温度值和控制显示装置的显示值；
S3，在获取的所述当前温度值下，根据获取的所述控制显示装置的显示值，控制第一调节组件调节第一储存腔体的容积和第二储存腔体的容积，当控制显示装置的显示值为预设值时，停止调节第一调节组件，并将所述第一调节组件和所述第二调节组件锁紧固定。
在一个实施例中，在步骤S3中，还包括步骤：
S301，当获取的所述控制显示装置的显示值为第一预设范围值时，控制所述第一调节组件使所述第二储存腔体内的油液流向所述第一储存腔体内，当控制显示装置的显示值为预设值时，停止调节第一调节组件，并将所述第一调节组件和所述第二调节组件锁紧固定；
S302，当获取的所述控制显示装置的显示值为第二预设范围值时，控制所述第一调节组件使所述第一储存腔体内的油液流向所述第二储存腔体内，当控制显示装置的显示值为预设值时，停止调节第一调节组件，并将所述第一调节组件和所述第二调节组件锁紧固定。
在一个实施例中，所述的调零方法还包括步骤：
S4，分别在当前温度值为第一温度值t 1、第二温度值t 2、第三温度值t 3.... 第n温度值t n下重复步骤S1、步骤S2和步骤S3，记录预设值A 1、A 2、A 3…. A n，根据公式：
丨A 1- A 2丨=k+ X 1×（t 2- t 1）；
丨A 3- A 2丨=k+ X 2×（t 3- t 1）；
…….
丨A n- A n-1丨=k+ X n×（t n- t n-1）；其中，k为远传压差变送器量程精度，t n大于t n-1， X为恒量；
S5，分别求出X 1、X 2、X 3、……X n，利用有限元函数拟合出一条水平直线，得出最终恒量X。
有益效果
本申请提供的远传压差变送器的有益效果在于：与现有技术相比，本申请的远传压差变送器，通过在远传压差变送器本体的外侧安装膜盒，并通过第一调节组件调节第一储存腔体的容积和第二储存腔体的容积，进而调节高压侧储存腔体与低压侧储存腔体之间的误差，使控制显示装置的显示值达到真实的测量值，消除了远传压差变送器两侧的体积差和温度差导致的精度低的问题，提高了产品的测量精度。
 附图说明
图1是本申请的一个实施例提供的远传压差变送器的立体结构示意图；
图2是本申请的一个实施例提供的远传压差变送器的局部结构示意图；
图3是图2中A部的放大结构示意图；
图4是本申请的一个实施例提供的远传压差变送器的膜盒的一视角结构示意图；
图5是图4中的远传压差变送器沿B-B方向的剖面示意图；
图6是本申请的一个实施例提供的远传压差变送器的一视角结构示意图
图7是图6中的远传压差变送器沿C-C方向的剖面示意图；
图8是本申请的另一个实施例提供的调零方法的一流程示意图；
图9是本申请的另一个实施例提供的调零方法的另一流程示意图。
上述附图所涉及的标号明细如下：
1-变送器本体；2-控制显示装置；3-膜盒；4-调节装置；
31-第一储存腔体；32-第二储存腔体；33-容腔；
41-第一调节组件；42-第二调节组件；
411-调节轴；412-顶环；413-密封圈；414-紧固环；415-旋转开口；416-旋转头；
421-调节座；422-密封环；423-固定坏；424-压环；425-调节阀芯；426-密封件；427-转头。
 本发明的实施方式
为了使本申请所要解决的技术问题、技术方案及有益效果更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
需要说明的是，当元件被称为“固定于”或“设置于”另一个元件，它可以直接在另一个元件上或者间接在该另一个元件上。当一个元件被称为是“连接于”另一个元件，它可以是直接连接到另一个元件或间接连接至该另一个元件上。
需要理解的是，术语“长度”、“宽度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
为了说明本申请所述的技术方案，以下结合具体附图及实施例进行详细说明。
如图1至图7所示，本申请的一个实施例提供了远传压差变送器，包括变送器本体1和控制显示装置2，所述变送器本体1内设置有高压侧储存腔体和低压侧储存腔体，所述控制显示装置2用于获取所述高压侧储存腔体和所述低压侧储存腔体的压力值；所述远传压差变送器还包括膜盒3和调节装置4，所述膜盒3内设置有与所述低压侧储存腔体连通的第一储存腔体31和与所述第一储存腔体31连通的第二储存腔体32；所述调节装置4包括分别设置于所述膜盒3上的第一调节组件41和第二调节组件42 ，所述第一调节组件41用于调节所述第一储存腔体31的容积和所述第二储存腔体32的容积，所述第二调节组件42用于控制所述第一储存腔体31和所述第二储存腔体32之间的连通和关闭。
本申请的实施例提供的远传压差变送器，通过在远传压差变送器本体1的外侧安装膜盒3，并通过第一调节组件41调节第一储存腔体31的容积和第二储存腔体32的容积，进而调节高压侧储存腔体与低压侧储存腔体之间的误差，使控制显示装置2的显示值达到真实的测量值，消除了远传压差变送器两侧的体积差和温度差导致的精度低的问题，提高了产品的测量精度。
进一步地，在本申请的一个实施例中，图2至图5所示，所述第一调节组件41包括分别设置于所述第一储存腔体31和所述第二储存腔体32的调节轴411，以及顶环412，所述顶环412套设于所述调节轴411上，且所述顶环412抵靠在所述第一储存腔体31和所述第二储存腔体32的端部。
在该实施例中，第一调节组件41调节第一储存腔体31和第二储存腔体32时，可以分别调整位于第一储存腔体31和位于第二储存腔体32的调节轴411，使其调节方便简单，顶环412用于密封第一储存腔体31和所述第二储存腔体32的端部。
在上述实施例中，进一步地，如图2和图3所示，所述第一调节组件41还包括密封圈413，所述密封圈413贴设于所述顶环412与所述第一储存腔体31和所述第二储存腔体32的端部之间。可选地，密封圈413可以为O型密封圈413，可以由橡胶材料制成，提供顶环412与第一储存腔体31和第二储存腔体32的端部的密封效果。
进一步地，在第一调节组件41包括调节轴411和顶环412的实施例中，如图2和图3所示，所述第一调节组件41还包括紧固环414，所述紧固环414套设于所述调节轴411上，且所述紧固环414上设置有第一连接部，所述顶环412上设置有第二连接部，所述第一连接部与所述第二连接部连接，以用于锁定所述调节轴411转动。
在该实施例中，当不需要调整调节轴411时，可以通过拧紧紧固环414与顶环412，实现二者之间的锁定，使调节轴411不能转动，可选地，第一连接部和第二连接部可以为内螺纹和外螺纹相配合。
进一步地，如图2和图3所示，为了方便对紧固环414的转动，在所述紧固环414上靠近所述膜盒3的外侧一端设置有旋转开口415。旋转开口415可以在紧固环414的端部设置多个，可以通过设计与旋转开口415匹配的扳手进行操作旋转。
进一步地，如图2和图3所示，在第一调节组件41包括调节轴411和顶环412的实施例中，在所述调节轴411上靠近所述膜盒3的外侧一端设置有旋转头416。
更进一步地，如图2所示，所述旋转头416为方形头；或所述旋转头416上开设有一字型开口；或
所述旋转头416上开设有十字形开口；或
所述旋转头416上设置有方形孔或多边形孔。
在该实施例中，旋转头416的设计，在对调节轴411进行调节时，可以通过一字螺丝刀或十字形螺丝刀或带有方头的扳手即可进行调整，不用配置专用的工具进行调整，使其操作起来更加方便。
需要说明的是，调节轴411还可以通过伺服电机通过同步带轮和两个啮合齿轮分别与第一储存腔体31和第二储存腔体32的调节轴411连接，进行驱动调整，便于自动化控制。
进一步地，在本申请的一个实施例中，如图2、图3、图6和图7所示，所述第二调节组件42包括调节座421调节阀芯425，具体地，所述调节座421内设置有安装腔，并设置于所述膜盒3内；所述调节阀芯425转动地设置于所述安装腔内，且所述调节阀芯425的一端抵靠于所述第一储存腔体31和所述第二储存腔体32的连接处，调节阀芯425的此端的端部可以是锥形面，便于对第一存储腔体和第二储存腔体32的连通处进行封堵，所述调节阀芯425的另一端靠近所述膜盒3的外侧，且在所述调节阀芯425的另一端设置有转头427，转头427靠近膜盒3外侧的一端可以设置一字形开口、十字形开口或多边形开孔等，具体可以和上述实施例中的旋转头416的结构一样。
更进一步地，如图4和图5所示，所述膜盒3上设置有与所述第二储存腔体32连通的容腔33，所述容腔33设置于所述第一储存腔体31和所述第二储存腔体32的连接处；所述调节座421包括密封环422和固定环423，所述密封环422贴设于所述容腔33的开口端；所述固定环423设置有与所述密封环422连接的压环424，且所述固定环423上靠近所述膜盒3的外侧一端设置有旋转口。调节阀芯425穿过容腔33可抵靠在第一储存腔体31和第二储存腔体32的连接处，调节时，可以先通过与旋转口匹配的扳手对固定环423松开，也就是向膜盒3的外侧方向旋转退出一定距离，然后在通过与转头426配合的工具进行将调节阀芯425向膜盒3的外侧方向退出一定距离，进而实现第一存储腔体和第二储存腔体32的连通。
在上述实施例中，更进一步地，如图2和图3所示，所述密封环422与所述开口端之间设置有密封件426，所述密封件426用于密封所述密封环422与所述容腔33的连接处。密封件426可选择使用o型密封圈413，或其他密封垫等。用于将密封环422与容腔33的连接处进行密封，保证密封效果。
如图8和图9所示，本申请的实施例还提供了一种用于上述任一实施例所述的远传压差变送器的调零方法，可以在当前温度值下，对远传压差变送器的高压侧储存腔体进行灌油，当控制显示装置2显示的压力值达到第一预设压力值时，停止灌油，封闭所述高压侧储存腔体；
对远传压差变送器的低压侧储存腔体进行灌油，当控制显示装置2显示的压力值为零时，停止灌油，封闭所述低压侧储存腔体。
进行调零方法包括步骤：
S1，调节远传压差变送器的第二调节组件，使第一储存腔体与第二储存腔体连通，实现低压侧储存腔体与所述第二储存腔体连通；
S2，获取当前温度值和控制显示装置的显示值；
S3，在获取的所述当前温度值下，根据获取的所述控制显示装置的显示值，控制第一调节组件调节第一储存腔体的容积和第二储存腔体的容积，当控制显示装置的显示值为预设值时，停止调节第一调节组件，并将所述第一调节组件和所述第二调节组件锁紧固定。
具体地，可以假定高压侧储存腔体压力大于低压侧存储腔体时，控制显示装置也就是远传压差变送器的仪表表头显示值为正值（第一预设范围值）；高压侧储存腔体压力小于低压侧存储腔体时，仪表表头示值为负值。
步骤S301，当获取的所述控制显示装置的显示值为第一预设范围值（正值）时，控制所述第一调节组件使所述第二储存腔体内的油液流向所述第一储存腔体内，也就是，可以通过将第一调节组件的紧固环向膜盒的外侧方向移动一定距离，再通过工具如一字螺丝刀将第二储存腔体的调节轴退出一定距离，然后再通一字形螺丝刀将位于第一储存腔体的调节轴向膜盒内部方向前进一定距离，当控制显示装置的显示值为预设值时，可以是显示值无限趋近于预设值时，停止调节第一调节组件，并将所述第一调节组件和所述第二调节组件锁紧固定，通过一字螺丝刀将调节阀芯前进使其关闭第一储存腔体和第二储存腔体之间的连通，然后通过固定环进行锁紧；
步骤S302，当获取的所述控制显示装置的显示值为第二预设范围值（负值）时，控制所述第一调节组件使所述第一储存腔体内的油液流向所述第二储存腔体内，也就是，可以通过将第一调节组件的紧固环向膜盒的内侧方向移动一定距离，再通过工具如一字螺丝刀将第二储存腔体的调节轴前进一定距离，然后再通一字形螺丝刀将位于第一储存腔体的调节轴向膜盒外部方向退出一定距离，当控制显示装置的显示值为预设值时，可以是显示值无限趋近于预设值时，当控制显示装置的显示值为预设值时，停止调节第一调节组件，并将所述第一调节组件和所述第二调节组件锁紧固定，具体锁定操作和上述步骤S301同理，在此就不一一赘述。
进一步地，如图9所示，在本申请的一个实施例中，所述的调零方法还包括步骤：
S4，分别在当前温度值为第一温度值t 1、第二温度值t 2、第三温度值t 3.... 第n温度值t n下重复步骤S1、步骤S2和步骤S3，记录预设值A 1、A 2、A 3…. A n，根据公式：
丨A 1- A 2丨=k+ X 1×（t 2- t 1）；
丨A 3- A 2丨=k+ X 2×（t 3- t 1）；
…….
丨A n- A n-1丨=k+ X n×（t n- t n-1）；其中，k为远传压差变送器量程精度，t n大于t n-1， X为恒量；
S5，分别求出X 1、X 2、X 3、……X n，利用有限元函数拟合出一条水平直线，得出最终恒量X。这样处理器依据该恒量来处理数据，使远传压差变送器得出更接近于真正的测量值。
例如，在当前温度值为15°C、25°C、35°C下做以上步骤S1、步骤S2和步骤S3实验并记录数据，分别为A 1、A 2和A 3，选远传压差变送器的仪表量程精度k为0.2
假定恒量为 X n
丨A 1- A 2丨=0.2+ X 1×（25℃-15℃）；
丨A 3- A 2丨=0.2+ X 2×（35℃-25℃）；
…….
分别求出X 1、X 2、X 3、……X n，利用有限元函数拟合出一条水平直线，得出最终恒量X。
根据上述方法通过机械调零和数据的处理，消除了消远传压差变送器两侧的体积差和温度差导致的精度低的问题，提高了产品的测量精度。
以上所述仅为本申请的可选实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本申请的保护范围之内。

Claims (13)

  1. 一种远传压差变送器，包括变送器本体和控制显示装置，所述变送器本体内设置有高压侧储存腔体和低压侧储存腔体，所述控制显示装置用于获取所述高压侧储存腔体和所述低压侧储存腔体的压力值；其特征在于，所述远传压差变送器还包括：
    膜盒，所述膜盒内设置有与所述低压侧储存腔体连通的第一储存腔体和与所述第一储存腔体连通的第二储存腔体；
    调节装置，所述调节装置包括分别设置于所述膜盒上的第一调节组件和第二调节组件，所述第一调节组件用于调节所述第一储存腔体的容积和所述第二储存腔体的容积，所述第二调节组件用于控制所述第一储存腔体和所述第二储存腔体之间的连通和关闭。
  2. 如权利要求1所述的远传压差变送器，其特征在于，所述第一调节组件包括分别设置于所述第一储存腔体和所述第二储存腔体的调节轴；
    顶环，所述顶环套设于所述调节轴上，且所述顶环抵靠在所述第一储存腔体和所述第二储存腔体的端部。
  3. 如权利要求2所述的远传压差变送器，其特征在于，所述第一调节组件还包括密封圈，所述密封圈贴设于所述顶环与所述第一储存腔体和所述第二储存腔体的端部之间。
  4. 如权利要求2所述的远传压差变送器，其特征在于，所述第一调节组件还包括紧固环，所述紧固环套设于所述调节轴上，且所述紧固环上设置有第一连接部，所述顶环上设置有第二连接部，所述第一连接部与所述第二连接部连接，以用于锁定所述调节轴转动。
  5. 如权利要求4所述的远传压差变送器，其特征在于，所述紧固环上靠近所述膜盒的外侧一端设置有旋转开口。
  6. 如权利要求2所述的远传压差变送器，其特征在于，所述调节轴上靠近所述膜盒的外侧一端设置有旋转头。
  7. 如权利要求6所述的远传压差变送器，其特征在于，所述旋转头为方形头；或所述旋转头上开设有一字型开口；或
    所述旋转头上开设有十字形开口；或
    所述旋转头上设置有方形孔或多边形孔。
  8. 如权利要求1所述的远传压差变送器，其特征在于，所述第二调节组件包括：
    调节座，所述调节座内设置有安装腔，并设置于所述膜盒内；
    调节阀芯，所述调节阀芯转动地设置于所述安装腔内，且所述调节阀芯的一端抵靠于所述第一储存腔体和所述第二储存腔体的连接处，所述调节阀芯的另一端靠近所述膜盒的外侧，且在所述调节阀芯的另一端设置有转头。
  9. 如权利要求8所述的远传压差变送器，其特征在于，所述膜盒上设置有与所述第二储存腔体连通的容腔，所述容腔设置于所述第一储存腔体和所述第二储存腔体的连接处；
    所述调节座包括：
    密封环，所述密封环贴设于所述容腔的开口端；
    固定环，所述固定环设置有与所述密封环连接的压环，且所述固定环上靠近所述膜盒的外侧一端设置有旋转口。
  10. 如权利要求9所述的远传压差变送器，其特征在于，所述密封环与所述开口端之间设置有密封件，所述密封件用于密封所述密封环与所述容腔的连接处。
  11. 一种远传压差变送器的调零方法，其特征在于，包括步骤：
    S1，调节远传压差变送器的第二调节组件，使第一储存腔体与第二储存腔体连通，实现低压侧储存腔体与所述第二储存腔体连通；
    S2，获取当前温度值和控制显示装置的显示值；
    S3，在获取的所述当前温度值下，根据获取的所述控制显示装置的显示值，控制第一调节组件调节第一储存腔体的容积和第二储存腔体的容积，当控制显示装置的显示值为预设值时，停止调节第一调节组件，并将所述第一调节组件和所述第二调节组件锁紧固定。
  12. 如权利要求11所述的调零方法，其特征在于，在步骤S3中，还包括步骤：
    S301，当获取的所述控制显示装置的显示值为第一预设范围值时，控制所述第一调节组件使所述第二储存腔体内的油液流向所述第一储存腔体内，当控制显示装置的显示值为预设值时，停止调节第一调节组件，并将所述第一调节组件和所述第二调节组件锁紧固定；
    S302，当获取的所述控制显示装置的显示值为第二预设范围值时，控制所述第一调节组件使所述第一储存腔体内的油液流向所述第二储存腔体内，当控制显示装置的显示值为预设值时，停止调节第一调节组件，并将所述第一调节组件和所述第二调节组件锁紧固定。
  13. 如权利要求11所述的调零方法，其特征在于，所述的调零方法还包括步骤：
    S4，分别在当前温度值为第一温度值t 1、第二温度值t 2、第三温度值t 3.... 第n温度值t n下重复步骤S1、步骤S2和步骤S3，记录预设值A 1、A 2、A 3…. A n，根据公式：
    丨A 1- A 2丨=k+ X 1×（t 2- t 1）；
    丨A 3- A 2丨=k+ X 2×（t 3- t 1）；
    …….
    丨A n- A n-1丨=k+ X n×（t n- t n-1）；其中，k为远传压差变送器量程精度，t n大于t n-1， X为恒量；
    S5，分别求出X 1、X 2、X 3、……X n，利用有限元函数拟合出一条水平直线，得出最终恒量X。
PCT/CN2021/072868 2021-01-20 2021-01-20 远传压差变送器及调零方法 WO2022155813A1 (zh)

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CN101995315A (zh) * 2009-08-18 2011-03-30 华东电力试验研究院有限公司 差压变送器精度现场检测方法
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CN202329922U (zh) * 2011-11-19 2012-07-11 刘大伟 一种带有温度补偿活塞的远传压力、差压变送器
CN209014197U (zh) * 2018-11-29 2019-06-21 安阳化学工业集团有限责任公司 一种差压变送器校验装置
CN211317613U (zh) * 2019-09-06 2020-08-21 江苏金仕达仪表科技有限公司 一种双法兰差压变送器的测试装置
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Publication number Priority date Publication date Assignee Title
US4776201A (en) * 1987-12-22 1988-10-11 Marathon Oil Company Method and apparatus for calibrating a differential pressure transducer
CN101995315A (zh) * 2009-08-18 2011-03-30 华东电力试验研究院有限公司 差压变送器精度现场检测方法
KR20120032675A (ko) * 2010-09-29 2012-04-06 한국표준과학연구원 차압계 교정 장치 및 압력계 교정장치
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