阅读说明：本技术 阀门位置指示器和阀门位置指示系统 (Valve position indicator and valve position indicating system ) 是由 罗世洪 王宇翔 郭松 李朋洲 袁晟毅 张冬林 秦胜杰 李晓钟 于 2020-07-23 设计创作，主要内容包括：本发明公开了阀门位置指示器和阀门位置指示系统,包括阀门位置指示器的本体结构,所述本体结构包括连续式阀位信号感应部,连续式阀位信号感应部包括骨架、线圈,所述线圈包括初级线圈、次级线圈,其特征在于,所述初级线圈绕制在骨架外,所述次级线圈的数量为2个,2个次级线圈同时绕制在初级线圈上,其中一个次级线圈的绕制匝数沿骨架轴线中点向骨架的A端方向增多,另一个次级线圈的绕制匝数沿骨架轴线中点向骨架的B端方向增多。采用补偿式线圈结构,感应电动势增大,非线性区间得到改善,扩大了连续式阀位信号的线性测量范围。(The invention discloses a valve position indicator and a valve position indicating system, which comprise a body structure of the valve position indicator, wherein the body structure comprises a continuous valve position signal induction part, the continuous valve position signal induction part comprises a framework and coils, and the coils comprise primary coils and secondary coils. By adopting the compensation type coil structure, the induced electromotive force is increased, the nonlinear interval is improved, and the linear measurement range of the continuous valve position signal is enlarged.)

1. Valve position indicator, including the body structure of valve position indicator (1), the body structure includes continuous type valve position signal induction part, and continuous type valve position signal induction part includes skeleton (13), coil (14) include primary coil (143), secondary, its characterized in that, primary coil (143) coiling is outside skeleton (13), secondary's quantity is 2, and 2 secondary coils are the coiling simultaneously on primary coil (143), and the A end direction of the middle point to skeleton (13) is increased along skeleton (13) axis to the coiling number of turns of one of them secondary, and the B end direction of the middle point to skeleton (13) is increased along skeleton (13) axis to the coiling number of turns of another secondary.

2. The valve position indicator of claim 1,

the primary coil (143) is wound uniformly in number of turns; the 2 secondary coils are respectively a secondary coil A (141) and a secondary coil B (142);

the winding layers of the secondary coil A (141) and the secondary coil B (142) are N, each layer of coil forms a turn, N is greater than or equal to 2, and the winding turns of each layer of the secondary coil A (141) and the secondary coil B (142) are sequentially reduced layer by layer from inside to outside;

the turns of all layers in the secondary coil A (141) are aligned on the side adjacent to the end A, and the side of the secondary coil A (141) facing the secondary coil B (142) is stepped; the turns of all layers in the secondary coil B (142) are aligned on the side adjacent to the B end, and the side of the secondary coil B (142) facing the secondary coil A (141) is stepped.

3. The valve position indicator of claim 1,

the primary coil (143) is wound uniformly in number of turns; the 2 secondary coils are respectively a secondary coil A (141) and a secondary coil B (142);

the winding layers of the secondary coil A (141) and the secondary coil B (142) are N, each layer of coil forms a turn, and N is greater than or equal to 1;

the number of winding turns of each layer of the secondary coil A (141) is sequentially increased from the middle point of the axis of the framework (13) to the end A of the framework (13); the winding turns of each layer of the secondary coil B (142) are sequentially increased along the axial middle point of the framework (13) towards the B end of the framework (13).

4. The valve position indicator of claim 1,

the primary coil (143) is wound uniformly in number of turns; the 2 secondary coils are respectively a secondary coil A (141) and a secondary coil B (142);

the winding layers of the secondary coil A (141) and the secondary coil B (142) are N, and N is greater than or equal to 1;

the secondary coil A (141) of each layer is sequentially provided with i winding sections along the direction from the middle point of the axis of the framework (13) to the end A of the framework (13), a blank section is arranged between every two winding sections, the blank section is an interval without winding coils, the number of turns of the secondary coil A (141) in the 1 st winding section is A1, the number of turns of the secondary coil A (141) in the 2 nd winding section is A2 and …, the number of turns of the secondary coil A (141) in the ith winding section is Ai, and the values of A1, A2, … and Ai are sequentially increased;

the secondary coil B (142) of each layer is sequentially provided with p winding sections along the direction from the middle point of the axis of the framework (13) to the end B of the framework (13), a blank section is arranged between every two winding sections and is an interval without winding coils, wherein the number of turns of the secondary coil B (142) in the 1 st winding section is A1, the number of turns of the secondary coil B (142) in the 2 nd winding section is A2 and …, and the number of turns of the secondary coil A (141) in the p-th winding section is A2_p，A1、A2、…、A_pAre sequentially increased.

5. The valve position indicator of claim 1,

the pressure-bearing type valve core assembly is characterized by further comprising a valve core assembly (10) and a pressure-bearing sleeve (9), wherein the pressure-bearing sleeve (9) is sleeved outside the valve core assembly (10), and the framework (13) is sleeved outside the pressure-bearing sleeve (9);

the valve core assembly (10) comprises a soft magnet (22) and 2 permanent magnets (21), wherein the soft magnet (22) is located in an upper section interval of the valve core assembly (10), the 2 permanent magnets (21) are located in a lower section interval of the valve core assembly (10), and the soft magnet (22) is located in an interval between an A end and a B end of the framework (13);

the 2 permanent magnets (21) are arranged up and down, wherein the pressure-bearing sleeve (9) corresponding to the 2 permanent magnets (21) is provided with corresponding magnetic control switch probes (8) which are arranged up and down.

6. The valve position indicator of claim 5,

the valve core assembly (10) comprises a valve rod (20), after a blind hole is formed in the upper end of the valve rod (20), a soft magnet (22) is arranged in the blind hole, and an end enclosure (23) is adopted to seal the blind hole; 2 permanent magnets are sleeved on the lower section interval of the valve rod (20).

7. The valve position indicator of claim 1,

the coil pressure-bearing device is characterized by further comprising a shell assembly, wherein the shell assembly comprises a coil outer cover (15) and a top cover (17), the coil outer cover (15) is sleeved outside the coil, the lower portion of the coil outer cover (15) is in butt joint with a flange in the middle of the pressure-bearing sleeve through the flange, and the top cover (17) is arranged on the upper portion of the coil outer cover (15) in a covering mode after the flange is in butt joint with the coil outer cover (15).

8. The valve position indicator of claim 7,

the pressure-bearing sleeve is characterized by further comprising a check washer (19) and a locking nut (18), the upper end of the pressure-bearing sleeve extends into the top cover, the check washer (19) and the locking nut (18) are both sleeved at the upper end of the pressure-bearing sleeve, the check washer (19) is in compression joint with the end A of the framework, the locking nut (18) is in compression joint with the check washer (19),

the B end of the framework is in pressure joint with a flange in the middle of the pressure-bearing sleeve.

9. A valve position indicating system, characterized in that,

the valve position indicator comprises the valve position indicator (1) and a cabinet (6) according to any one of claims 1 to 8, wherein the cabinet (6) introduces a continuous valve position signal output by a continuous valve position signal sensing part and limit signals output by 2 magnetic control switch probes from the valve position indicator (1); the limiting signals of the switching value output by the 2 magnetic control switch probes are respectively an upper limiting signal and a lower limiting signal, and the upper limiting signal and the lower limiting signal respectively represent the upper limiting position and the lower limiting position of the valve;

the continuous valve position signal is an analog quantity signal, and the upper limit signal and the lower limit signal respectively represent standard current signals of 4mA and 20 mA;

the cabinet (6) is provided with a self-checking early warning program: if the current continuous valve position signal is the preset minimum analog value, and the switch state of the lower limiting signal is not on, a self-checking fault early warning signal is sent out, and if the current continuous valve position signal is the preset maximum analog value, the switch state of the upper limiting signal is not on, a self-checking fault early warning signal is sent out.

10. The valve position indicating system of claim 9,

the cabinet (6) is provided with an over-range early warning program: and if the on-off state of the current upper limit signal is on and the continuous valve position signal exceeds the preset maximum analog value, sending out an over-range early warning signal.

Technical Field

The invention relates to the field of valve position measurement, in particular to a valve position indicator and a valve position indicating system.

Background

The invention relates to a valve position indicator, in particular to a multifunctional valve core linear position indicator applied to valves at important parts of a nuclear power station.

The valve position indicator is used for indicating the opening and closing state or opening height (namely opening degree) of the valve, and is favorable for field display of the valve position or real-time transmission of a valve position signal. At present, the principles adopted by valve position indicators are mainly of limit switch type, reed tube type, potentiometer type, strain type, hall type, inductance type, capacitance type, magnetic grid type and magnetostriction type. The limit switch type and the dry reed type belong to point type position indicators, and generally only indicate the fully-opened and fully-closed positions of a valve; the valve position indicator of other principles belongs to a continuous position indicator and can indicate any opening degree of the valve.

The valve position indicator is critical to the safe operation of the valve. In some nuclear accidents, the safety valve of the voltage stabilizer cannot be closed after being opened, and the safety valve is not provided with a valve position indicator, so that an operator in a control room cannot timely find the fault, and the nuclear accidents are caused. Hereinafter, the specification requires that "the safety valve main valve should be provided with opening and closing position indicators and opening and closing position signal outputs".

In the disclosed invention, the valve position indicator is either of a point type or a continuous type.

The current valve position indicator has the following technical problems:

1. after the linear valve position indicators exceed the measuring range, the non-linearity is increased to cause the measuring precision to be reduced, and the original linear interval is small, the measuring range is small, so that the measuring signal is weak to cause the measuring precision to be low

2. Almost all valve position indicators are based on a single principle for displacement measurement.

3. The valve position indicator is a safety device, does not allow outputting error signals for the opening and closing states of the valve, and must ensure the authenticity and reliability of the output signals.

Disclosure of Invention

The invention aims to provide a valve position indicator and a valve position indicating system. The valve position indicator can improve the range, improve the strength of a measuring signal and further improve the measuring precision.

The invention is realized by the following technical scheme:

valve position indicator, including valve position indicator's body structure, body structure includes continuous type valve position signal induction part, and continuous type valve position signal induction part includes skeleton, coil, the coil includes primary coil, secondary coil, its characterized in that, the primary coil coiling is outside the skeleton, secondary coil's quantity is 2, and 2 secondary coils are the coiling simultaneously on primary coil, and the coiling number of turns of one of them secondary coil increases to the A end direction of skeleton along the skeleton axis midpoint, and the coiling number of turns of another secondary coil increases to the B end direction of skeleton along the skeleton axis midpoint.

Above-mentioned technical scheme can realize improving the range of measuring range and improving the intensity of measuring signal to improve the purpose of measurement accuracy, its principle is:

the invention adopts a linear variable voltage differential output principle to obtain a voltage differential signal, and then continuously indicates the position of the valve according to the voltage differential; as shown in fig. 1, fig. 1 is a conventional continuous valve position signal sensing part, in fig. 1, the continuous valve position signal sensing part includes a tubular framework, which is wound with 1 primary coil and 2 secondary coils at the periphery, and the primary coil is located in the middle of the 2 secondary coils; as shown in fig. 1, the magnetic lines of force in the central region are relatively straight and uniform, so the linear region in the central region is only required to be provided with one iron core in the central region, but because the secondary coil and the primary coil are uniformly arranged, and the turns of the central region and the two end regions are the same, the magnetic lines of force are more close to the two ends due to the characteristic of the inherent dispersion of the two ends of the magnetic field, the deviation is larger, and the nonlinear region is generated, so as can be seen from fig. 1, the effective linear region is only the partial position of the central region. The position indicator needs to realize variable voltage differential output in a linear region, but the effective range of the position indicator is small. In order to improve the situation, the research finds that the problem that the deviation is larger as the magnetic force lines are closer to the two ends can be solved by only rearranging the primary coil and the secondary coil and rearranging the turns of the secondary coil by adopting a compensation method. The specific method comprises the following steps: as shown in fig. 2 and 3, the primary coil is uniformly wound on the framework, and then 2 secondary coils are wound to realize the purpose that the turns of the secondary coils compensate the offset of magnetic lines of force, wherein the winding turns of one secondary coil are increased along the direction from the midpoint of the axis of the framework to the end A of the framework, and the winding turns of the other secondary coil are increased along the direction from the midpoint of the axis of the framework to the end B of the framework; therefore, the turn density of the secondary coil in the central area is small, the turns of the two end areas are dense, the magnetic field intensity of the two end areas is compensated and enhanced, and therefore the magnetic lines of force at the two ends are more straight, the effective linear area is enlarged towards the two ends, and the measuring range is improved. We also found that the new coil layout can not only effectively improve the nonlinear interval and increase the linear measurement range, but also increase the induced electromotive force, so that the signal remote transmission distance between the coil and the transmitter cabinet can be increased to more than 200 m; therefore, the invention is beneficial to avoiding the signal from being weak and adopting complex amplification processing to distort the signal, thereby improving the accuracy of measurement. Meanwhile, the ultra-long remote signal transmission can be well adapted to the application environment of the nuclear power station, so that the signals of the radiation area and the safety area can be directly butted.

Preferably, under the basic concept of the above solution, in order to achieve reasonable turns arrangement of the secondary coil, the design of the present invention at least includes the following 3 specific designs according to the above concept, but is not limited to the following 3 cases:

the first method comprises the following steps:

the winding turns of the primary coil are uniformly wound; the 2 secondary coils are respectively a secondary coil A and a secondary coil B;

the winding layers of the secondary coil A and the secondary coil B are N, each layer of coil forms a turn, N is more than or equal to 2, and the winding turns of each layer of the secondary coil A and the secondary coil B are sequentially reduced from inside to outside layer by layer;

the turns of all layers in the secondary coil A are aligned at one side adjacent to the end A, and the side, facing the secondary coil B, of the secondary coil A is step-shaped; the turns of all layers in the secondary coil B are aligned on the side adjacent to the end B, and the side of the secondary coil B facing the secondary coil A is stepped.

The winding layout utilizes a multilayer design concept, the number of turns of the upper layer is smaller than that of the lower layer, and the two ends are aligned, so that the primary coil is wound to the whole length of the framework, the secondary coil is gradually increased from the middle to the two ends in a stepped mode, and the nonlinear interval can be effectively improved.

And the second method comprises the following steps:

the winding turns of the primary coil are uniformly wound; the 2 secondary coils are respectively a secondary coil A and a secondary coil B;

the winding layers of the secondary coil A and the secondary coil B are N, each layer of coil forms a turn, and N is greater than or equal to 1;

the number of winding turns of each layer of the secondary coil A is sequentially increased from the middle point of the axis of the framework to the end A of the framework; the winding turns of each layer of the secondary coil B are sequentially increased along the direction from the middle point of the axis of the framework to the end B of the framework.

This winding overall arrangement utilizes the axis direction directly to increase the number of turns, and is concrete, for example can adopt the winding of spiral to form, and the pitch of spiral reduces gradually along with when walking to both ends direction, therefore the number of turns of winding at both ends increases gradually to reach the number of turns at both ends and increase gradually, the mode that this kind of spiral winding increases the number of turns can be linear.

And the third is that:

the winding turns of the primary coil are uniformly wound; the 2 secondary coils are respectively a secondary coil A and a secondary coil B;

the winding layers of the secondary coil A and the secondary coil B are N layers, and N is greater than or equal to 1;

the secondary coil A of each layer is sequentially provided with i winding sections along the direction from the middle point of the axis of the framework to the end A of the framework, a blank section is arranged between every two winding sections, the number of turns of the secondary coil A (141) in the 1 st winding section is A1, the number of turns of the secondary coil A in the 2 nd winding section is A2 and …, the number of turns of the secondary coil A in the ith winding section is Ai, and the values of A1, A2, … and Ai are sequentially increased;

the secondary coil B of each layer is provided with p winding sections in turn along the middle point of the axis of the framework towards the end B direction of the framework, a blank section exists between each winding section, the blank section is an interval without winding coils, the number of turns of the secondary coil B in the 1 st winding section is A1, the number of turns of the secondary coil B in the 2 nd winding section is A2, …, and the number of turns of the secondary coil A in the p-th winding section is A_p，A1、A2、…、A_pAre sequentially increased.

The winding mode adopts a processing mode that the number of turns in the axial direction is the same as that in the second mode, wherein the winding interval is segmented, the number of turns is gradually increased according to the interval, and the mode of increasing the number of turns is stepped.

Preferably, on the basis of the scheme:

the pressure-bearing sleeve is sleeved outside the valve core assembly, and the framework is sleeved outside the pressure-bearing sleeve;

the valve core assembly comprises a soft magnet and 2 permanent magnets, wherein the soft magnet is positioned in an upper section interval of the valve core assembly, the 2 permanent magnets are positioned in a lower section interval of the valve core assembly, and the soft magnet is positioned in an interval between an A end and a B end of the framework;

the 2 permanent magnets are arranged up and down, wherein the pressure-bearing sleeve corresponding to the 2 permanent magnets is provided with a corresponding magnetic control switch probe arranged up and down.

In the technical scheme, the problem of output of a traditional single monitoring signal can be solved, and the traditional single monitoring signal adopts a single principle to monitor, so that self-checking cannot be formed, and whether the sensor works correctly is difficult to confirm. Wherein, the soft magnet is packaged at the top end, and the permanent magnet is fixed at the bottom end. When the valve is opened and closed, two valve position signals are synchronously output, mutual verification is realized, and the measurement is more accurate. The invention relates to a dual-channel signal output device, wherein a continuous valve position signal sensing part outputs analog quantity corresponding to one channel, specifically, the continuous valve position signal sensing part can be set to be an analog quantity signal of 4-20 mA, and 2 magnetic control switch probes output switching quantity signals corresponding to the other channel. Therefore, the remote end can realize self-checking diagnosis only by comparing the analog quantity signal with the switching quantity signal, and output an alarm signal. For example, setting the on of one of the magnetic control switch probes to correspond to an analog quantity signal of 4mA, setting the on of the other magnetic control switch probe to correspond to an analog quantity signal of 20mA, and setting the self-checking early warning program on the far-end cabinet: if the current continuous valve position signal is the preset minimum analog value of 4mA, and the switch state of the lower limiting signal is not on, then a self-checking fault early warning signal is sent out, if the current continuous valve position signal is the preset maximum analog value of 20mA, then the switch state of the upper limiting signal is not on, then a self-checking fault early warning signal is sent out,

preferably, on the basis of the scheme:

the valve core assembly comprises a valve rod, soft magnets are arranged in blind holes after the upper end of the valve rod is provided with the blind holes, and the blind holes are sealed by seal heads; 2 permanent magnets are sleeved on the lower section interval of the valve rod.

Preferably, on the basis of the scheme:

the pressure-bearing sleeve is characterized by further comprising a shell assembly, wherein the shell assembly comprises a coil outer cover and a top cover, the coil outer cover is sleeved outside the coil, the lower portion of the coil outer cover is in butt joint with a flange in the middle of the pressure-bearing sleeve through the flange, and the top cover is arranged on the upper portion of the coil outer cover in a covering mode after the flange is in butt joint with the coil outer cover.

The coil outer cover and the top cover form a split type outer cover design, and the protective outer cover is correspondingly designed at the position of components such as a sensor coil, so that the damage to an internal lead can be reduced during disassembly, and the maintenance is more convenient.

Preferably, on the basis of the scheme:

the anti-loosening device further comprises an anti-loosening washer and a locking nut, the upper end of the pressure-bearing sleeve extends into the top cover, the anti-loosening washer and the locking nut are both sleeved at the upper end of the pressure-bearing sleeve, the anti-loosening washer is pressed on the end A of the framework, the locking nut is pressed on the anti-loosening washer,

the B end of the framework is in pressure joint with a flange in the middle of the pressure-bearing sleeve.

Preferably, on the basis of the scheme:

an upper sealing gasket is arranged between the upper part of the coil outer cover and the top cover, and a lower sealing gasket is arranged between the lower part of the coil outer cover and the flange in the middle of the pressure-bearing sleeve.

Preferably, on the basis of the scheme:

a valve position indicating system comprises the valve position indicator and a cabinet, wherein the cabinet introduces a continuous valve position signal output by a continuous valve position signal sensing part and limit signals output by 2 magnetic control switch probes from the valve position indicator; the limiting signals of the switching value output by the 2 magnetic control switch probes are respectively an upper limiting signal and a lower limiting signal, and the upper limiting signal and the lower limiting signal respectively represent the upper limiting position and the lower limiting position of the valve;

the continuous valve position signal is an analog quantity signal, and the upper limit signal and the lower limit signal respectively represent standard current signals of 4mA and 20 mA;

the rack is provided with self-checking early warning procedure: if the current continuous valve position signal is the preset minimum analog value, and the switch state of the lower limiting signal is not on, a self-checking fault early warning signal is sent out, and if the current continuous valve position signal is the preset maximum analog value, the switch state of the upper limiting signal is not on, a self-checking fault early warning signal is sent out.

Preferably, on the basis of the scheme:

the cabinet is provided with an over-range early warning program: and if the on-off state of the current upper limit signal is on and the continuous valve position signal exceeds the preset maximum analog value, sending out an over-range early warning signal.

The invention can achieve the following effects:

a. two sets of different types of valve position signals are synchronously output, the two sets of valve position signals are mutually verified, no error signal is output, and the measurement accuracy and the safety are higher. b. The integrated valve core assembly structure saves space. The soft magnet and the permanent magnet are not affected with each other, and the magnetic switch is simple and reliable. c. The compensation type coil structure has the advantages that the induced electromotive force is increased, the nonlinear interval is improved, and the linear measurement range of the continuous valve position signal is enlarged. d. The split type outer cover structure is convenient to maintain and disassemble, and reduces the damage to the inside of the coil caused by human factors in the maintenance process.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a schematic structural diagram of a continuous valve position signal sensing part in the prior art.

Fig. 2 is a schematic structural diagram of a continuous valve position signal sensing portion according to the present invention.

Fig. 3 is a schematic structural diagram of another continuous valve position signal sensing part according to the present invention.

Fig. 4 is a schematic diagram of the valve position indicator of the present invention.

Fig. 5 is a schematic structural view of the valve core assembly of the present invention.

FIG. 6 is a schematic diagram of a valve position indicating system.

Reference numerals in the drawings denote:

1. the magnetic control switch type magnetic control valve comprises a valve position indicator, 2 an electrical connector, 3 a signal cable, 4 a junction box, 5 a reactor containment, 6 a cabinet, 7 a rack, 8 a magnetic control switch probe, 9 a pressure-bearing sleeve, 10 a valve core assembly, 11 a lower sealing gasket, 12 a fastener, 13 a framework, 14 a coil, 15 a coil outer cover, 16 an upper sealing gasket, 17 a top cover, 18 a locking nut, 19 a locking gasket, 20 a valve rod, 21 a permanent magnet, 22 soft magnets, 23 a sealing head, 141 a secondary coil A, 142 a secondary coil B, 143 a primary coil.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.