A device for remote monitoring and alarming of instrument tracing

Abstract

The application discloses a device for instrument heat tracing remote monitoring and alarm, which comprises a monitoring unit, a monitoring cable module and an instrument loop module connected with the monitoring cable module at one end. The device further comprises an alarm unit, a control system module and an alarm module connected with the control system module. A wiring unit is connected between the wiring end of the instrument loop module and the wiring end of the control system module, so that the instrument loop module and the control system module are detachably electrically connected. The device can monitor the heat tracing operation state through the special monitoring cable, and can alarm and prompt when an abnormality occurs. The DCS analog measurement point is introduced, the fault point position is directly prompted through certain logic judgment, the heat tracing problem on site can be handled in time through active work and the gateway is moved forward, the measurement point freezing is prevented to a great extent, the work efficiency is improved, and the work equipment is protected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of instrument related equipment, and particularly to a device for instrument heat tracing remote monitoring and alarm. BACKGROUND

[0002] The winter outdoor measuring point of a power plant is easily caused by abnormal heat tracing system to be passively dealt with, and the signal of the measuring point sampling pipeline may be distorted due to freezing, causing unit misoperation, mis-trip or serious influence on the regulation of the automatic regulation system. It is necessary to monitor the heat tracing operation in real time through a monitoring means, and to timely deal with problems or to remove protection in advance to prevent unit misoperation, and then to deal with it.

[0003] In a power plant or some other enterprises (such as chemical industry, etc.), the outdoor instrument needs to be heat traced in winter to prevent the measuring point sampling pipeline from freezing. At present, the most commonly used is self-controlled temperature electric heat tracing cable for heat tracing. In the case of heat tracing system failure, there is no good monitoring means to monitor whether the heat tracing is normal. In most cases, it is known that the heat tracing fails when the measuring point abnormity is reacted. If some protection and automatic measuring point (such as drum water level, drum pressure, etc.) abnormity occurs, it will directly threaten the normal operation of the unit, and in severe cases, it will cause protection misoperation and boiler trip. This situation occurs in winter in various power plants, and it is easy to cause passive situation. SUMMARY

[0004] This part aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part and the abstract and title of the specification to avoid obscuring the purpose of this part, the abstract and the title of the specification. Such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] In view of the above existing problems, the present application is proposed, and therefore, the purpose of the present application is to provide a device for instrument heat tracing remote monitoring and alarm, so that by setting a special monitoring cable, the heat tracing operation state is monitored, and alarm is given when abnormality occurs to prompt. The device has strong field application value.

[0006] To solve the above technical problems, the application provides the following technical scheme: a device for instrument heat tracing remote monitoring and alarm, comprising a monitoring unit, a monitoring cable module and an instrument loop module connected with one end of the monitoring cable module, the other end of the instrument loop module forms a wiring terminal; an alarm unit, comprising a control system module and a warning module connected with the control system module, the other end of the control system module also forms a wiring terminal; and a wiring unit connected between the wiring terminal of the instrument loop module and the wiring terminal of the control system module, so that the instrument loop module and the control system module are detachably electrically connected.

[0007] As a preferred scheme of the device for instrument heat tracing remote monitoring and alarm, the monitoring cable module comprises a 10Ω resistor, a 500Ω terminal resistor and a bimetallic temperature control switch, a 10Ω resistor is connected with the monitoring cable module by a crimping pipe at an interval of one meter, and a bimetallic temperature control switch is connected with the other end of the cable.

[0008] As a preferred scheme of the device for instrument heat tracing remote monitoring and alarm, the monitoring cable module is connected with a 500Ω terminal resistor at the end, and the 500Ω terminal resistor is connected with a 10Ω resistor and a bimetallic temperature control switch.

[0009] As a preferred scheme of the device for instrument heat tracing remote monitoring and alarm, the instrument loop module comprises a resistance meter and a control power supply connected with one end of the resistance meter, the monitoring cable is connected with the resistance meter, and the bimetallic temperature control switch is about 1 meter away from the resistance meter.

[0010] As a preferred scheme of the device for instrument heat tracing remote monitoring and alarm, the control system module comprises a remote IO intelligent front end and a DCS analog measurement point channel, and the analog measurement point output by the resistance meter is connected with the multi-channel remote IO intelligent front end.

[0011] As a preferred scheme of the device for instrument heat tracing remote monitoring and alarm, one side of the resistance meter is provided with a DCS analog measurement point channel connected with a cable.

[0012] As a preferred scheme of the device for instrument heat tracing remote monitoring and alarm, the warning module comprises a display screen alarm and an audible and visual alarm, and the display screen alarm is electrically connected with the monitoring cable module and the resistance meter.

[0013] As a preferred scheme of the device for instrument heat tracing remote monitoring and alarm, the audible and visual alarm is arranged outside the instrument loop module and connected with the resistance meter.

[0014] As a preferred scheme of the device for instrument heat tracing remote monitoring and alarm, wherein: the first terminal and the second terminal are arranged in the terminal shell, and the terminal shell comprises a pressing piece, a first clamping piece and a second clamping piece.

[0015] As a preferred scheme of the device for instrument heat tracing remote monitoring and alarm, wherein: the first clamping piece and the second clamping piece are arranged in the terminal shell, and the pressing piece is arranged on the upper side of the first clamping piece and the second clamping piece.

[0016] The present application has the beneficial effects that: the present application is through the arrangement of the special monitoring cable module, the heat tracing operation state is monitored, when the abnormality occurs, the warning module is alarmed and prompted, through the introduction of the DCS analog measurement point, the fault point position is directly prompted through certain logic judgment, through the active work, the key point is moved forward, the on-site heat tracing problem can be handled in time, the measurement point freezing is prevented to a great extent, the work efficiency is improved, and the work equipment is protected. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0018] Figure 1 The principle diagram of the monitoring cable module of the device for instrument heat tracing remote monitoring and alarm.

[0019] Figure 2 The loop wiring diagram of the device for instrument heat tracing remote monitoring and alarm.

[0020] Figure 3 The resistance surface panel of the device for instrument heat tracing remote monitoring and alarm.

[0021] Figure 4 The logic control diagram of the device for instrument heat tracing remote monitoring and alarm.

[0022] Figure 5 The display and alarm schematic diagram of the device for instrument heat tracing remote monitoring and alarm.

[0023] Figure 6 The overall structure unit operation flow chart of the device for instrument heat tracing remote monitoring and alarm.

[0024] Figure 7The whole structure diagram of the wiring unit of the device for instrument heat tracing remote monitoring and alarming.

[0025] Figure 8 The structure sectional view of the wiring unit of the device for instrument heat tracing remote monitoring and alarming. DETAILED DESCRIPTION

[0026] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0027] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details given herein. In other instances, well-known methods have not been described in detail in order to avoid unnecessarily obscuring the present application.

[0028] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0029] Thirdly, the present application is described in detail in conjunction with the schematic diagram. In the detailed description of the embodiments of the present application, the sectional view of the device structure is partially enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the scope of protection of the present application herein. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0030] Embodiment 1

[0031] Reference Figure 1 and Figure 6 A device for instrument heat tracing remote monitoring and alarming, comprising a monitoring unit 100, including a monitoring cable module 101 and an instrument loop module 102 connected to one end of the monitoring cable module 101, the other end of the instrument loop module 102 forms a wiring end 103; an alarm unit 200, including a control system module 201 and a warning module 202 connected to the control system module 201, the other end of the control system module 201 also forms a wiring end 203; and a wiring unit 300 connected between the wiring end 103 of the instrument loop module 102 and the wiring end 203 of the control system module 201, so that the instrument loop module 102 and the control system module 201 form a detachable electrical connection.

[0032] Specifically, the main structure of the present application comprises a monitoring unit 100, an alarm unit 200 and a wiring unit 300. In the embodiment, the monitoring unit 100 comprises a monitoring cable module 101 and an instrument loop module 102 connected to one end of the monitoring cable module 101. The monitoring cable module 101 is connected to a resistance and a bimetallic temperature controller through a crimping tube at an interval of 1 meter. When the temperature is abnormal, the temperature controller acts, and the resistance after the fault point is short-circuited. The effective resistance of the cable is introduced into a resistance meter for processing.

[0033] The monitoring cable module is connected to the instrument loop module 102. The instrument loop module 102 is provided with a resistance meter. The output analog quantity of the resistance meter is measured through a remote IO intelligent front end to a unit DCS. When the temperature in the heat tracing layer decreases, the temperature controller will act. The loop resistance then changes. Then, through certain logic judgment, a sound and light alarm (DCS existing function) is directly given, and the approximate position of the fault is displayed.

[0034] Meanwhile, the alarm unit 200 comprises a control system module 201 and a warning module 202 connected to the control system module 201. The connection between the alarm unit 200 and the monitoring unit 100 can be quickly detached through the wiring unit 300, so that the maintenance and assembly between the two modules can be facilitated. One end of the cable of the monitoring cable module 101 is connected to a first wiring end 103. The control system module 201 and the warning module 202 are connected to a second wiring end 203. Through the quick plug-in of the wiring unit 300, the monitoring cable module 101 can be more conveniently adjusted for instrument heat tracing remote monitoring, and the distance of the monitoring cable can also be controlled.

[0035] Embodiment 2

[0036] Reference Figures 2-5 The difference between this embodiment and the first embodiment is that the monitoring cable module 101 comprises a 10Ω resistance 103, a 500Ω terminal resistance 104 and a bimetallic temperature control switch 105. The monitoring cable module 101 is connected to a 10Ω resistance 103 through a crimping tube at an interval of 1 meter, and the other end of the cable is connected to a bimetallic temperature control switch 105. The monitoring cable module 101 is connected to a 500Ω terminal resistance 104 at the end, and the 500Ω terminal resistance 104 is connected to the 10Ω resistance 103 and the bimetallic temperature control switch 105. The instrument loop module 102 comprises a resistance meter 106 and a control power supply 107 connected to one end of the resistance meter 106. The monitoring cable 101 is connected to the resistance meter 106. The distance between the bimetallic temperature control switch 105 and the resistance meter 106 is about 1 meter.

[0037] The control system module 201 comprises a remote IO intelligent front end 204 and a DCS analog measurement point channel 205, and the analog measurement point output by the resistance meter 106 is connected to the multi-channel remote IO intelligent front end 204. The resistance meter 106 is provided with a cable connected to the DCS analog measurement point channel 205 of the unit. The warning module 202 comprises a display screen alarm 206 and an audible and visual alarm 207, and the display screen alarm 206 is electrically connected to the monitoring cable module 101 and the resistance meter 106. The audible and visual alarm 207 is arranged outside the instrument loop module 102 and is connected to the resistance meter 106.

[0038] Specifically, in the embodiment, the monitoring cable module 101 is made as follows: L1 is connected to a 10-ohm resistance 103 through a crimping pipe at an interval of one meter, and then is connected to a bimetallic temperature switch 105 with a set value of 2°C (positive and negative error of 2 degrees) and an interval of one meter. The switch needs to be purchased externally. The cable is filled with high-temperature insulation material internally, and a high-temperature insulation sheath is used externally. Since the sampling pipeline of the instrument is dead water, the temperature resistance is 200°C, and the cable sheath is marked at about 10 cm after the connection of the 10-ohm resistance 103 and the temperature control bimetallic temperature switch 105, with an interval of one meter, as shown in Figure 1 .

[0039] In the embodiment, the monitoring cable module 101 is installed as follows: the cable is wrapped with a thin thermal insulation layer externally during installation, and then is installed in the heat protection layer. According to the actual situation of the site, most of the instrument pipelines are within 20 meters, and it is recommended that the maximum cable length is about 30 meters. After the cable is cut, a 500-ohm terminal resistance 104 is installed at the end through wiring, and then is packaged with a heat shrink tube and is well insulated.

[0040] Further, the instrument loop module 102 is installed as shown in Figure 2 The monitoring cable module 101 is connected to the terminal of the resistance meter 106, the first temperature control switch 105 is about one meter away from the resistance meter 106, the resistance meter 106 has a range of 1000 ohms (which can be adjusted according to the actual cable length of the site), and the power supply 107 is connected to a 220VAC power supply. One instrument loop module 102 is installed with one resistance meter 106 and one monitoring cable module 101 (as shown in Figure 3 Due to the relatively concentrated site of the instrument, the analog measurement points output by the resistance meters 106 at one centralized position are connected to one multi-channel remote IO intelligent front end 204, and one cable is laid to the DCS analog measurement point channel 205 of the unit. In this way, the engineering quantity is reduced, the cable cost is saved, and the loop is relatively simple.

[0041] At the same time, the DCS configuration and picture display (taking the application of the Xinhua DCS control system ICAN software as an example) are as follows: according to the logic (as shown in Figure 4determines whether there is one abnormality or multiple abnormality, and displays a screen showing the first position of the monitoring cable module 101 and whether there is multiple abnormality (as shown in Figure 5 and alarms, the abnormal position is the distance from the fault point to the resistance meter 106, and the alarm is automatically reset when the heating system is normal. Figure 4 、 Figure 5 The logic diagram and screen display of the first and second monitoring points of the 5-meter monitoring cable module 101 are shown. The alarm module 202 includes a display screen alarm 206 and an audible and visual alarm 207, which outputs an alarm on the display screen alarm 206 through the resistance meter 106, or simultaneously realizes on-site alarm through the audible and visual alarm 207 and other alarm devices. In this embodiment, DCS is the abbreviation of Distributed Control System, which means distributed control system in Chinese.

[0042] The remaining structure is the same as that of embodiment 1.

[0043] Embodiment 3

[0044] Referring to Figures 6-7 , the difference between this embodiment and the above embodiments is that the first wiring terminal 103 and the second wiring terminal 203 are arranged in the wiring shell 301, and the wiring shell 301 includes a pressing piece 302, a first clamping piece 303 and a second clamping piece 304. The first clamping piece 303 and the second clamping piece 304 are arranged in the wiring shell 301, and the pressing piece 302 is arranged on the upper side of the first clamping piece 303 and the second clamping piece 304.

[0045] Specifically, as Figures 6-8 , the wiring unit includes a wiring shell 301 with an empty accommodation inside, and a pair of clamping pieces, i.e. the first clamping piece 303 and the second clamping piece 304, arranged symmetrically in the longitudinal direction inside the wiring shell 301. The wiring shell 301 is a groove structure with one side open, which is made of insulating material (such as plastic). One end of the monitoring cable module 101 is connected to the first wiring terminal 103, and the control system module 201 and the alarm module 202 are connected to the second wiring terminal 203. By quickly plugging the monitoring cable module 101, it is more convenient to adjust the instrument heating remote monitoring, and the distance of the monitoring cable can also be controlled.

[0046] Further, the wiring process of the wiring unit 300 of the present application is as follows: when the first wiring terminal 103 and the second wiring terminal 203 are respectively inserted into the corresponding threading space from the plug-in ports at both ends of the wiring shell 301, the wiring terminals can be in contact with the pressing plates of the first clamping piece 303 and the second clamping piece 304, and by pressing the outwardly convex pressing piece 302, the elastic first clamping piece 303 and the second clamping piece 304 can be deformed inwardly and pressed on the folding angle of the pressing piece 302, at the same time, the pressing piece 302 push plate can pass through the port of the wiring shell 301.

[0047] When it is necessary to remove the pressure of the pressing member 302 on each elastic pressing head, it is only necessary to press the end of the push plate of the protruding pressing member 302 to push the elastic arc-shaped plates of the first clamping member 303 and the second clamping member 304 and make them restore the outward convex shape.

[0048] The rest of the structure is the same as that of Example 2.

[0049] It is important to note that the construction and arrangement of the application shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in the application. For example, elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be reversed or otherwise varied, and the nature or number of elements or positions can be altered or varied. Accordingly, all such variations are intended to be included within the scope of the present application. The order or sequence of any process or method steps can be varied or re-sequenced without materially affecting the application. Any "open" claims during the processing can be combined and are intended to be encompassed within the claims. Other substitutions, modifications, changes, and omissions can be made in the design, operating

[0050] Also, to provide a concise description of the exemplary embodiments, not all features of an actual implementation can be described (i.e., those related to the

[0051] It should be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions can be made. Such development efforts might be complex and time-consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill in the art having the benefit of this disclosure.

[0052] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A device for remote monitoring and alarming of instrument tracing, characterized in that: The utility model relates to a kind of electric power monitoring system, including, Monitoring unit (100), including monitoring cable module (101) and the instrument loop module (102) with one end of the monitoring cable module (101) is connected, the other end of the instrument loop module (102) forms terminal (103); Alarm unit (200), including control system module (201) and warning module (202) connected with the control system module (201), the other end of the control system module (201) also forms terminal (203);And, Wiring unit (300) is connected between the first terminal (103) of the instrument loop module (102) and the second terminal (203) of the control system module (201), so that the instrument loop module (102) and the control system module (201) form detachable electrical connection between, the first terminal (103) and the second terminal (203) are arranged in wiring shell (301), the wiring shell (301) includes pressing piece (302), first clamping piece (303) and second clamping piece (304), when first terminal 103 and second terminal 203 are inserted into corresponding threading space from the plug-in port of the wiring shell 301 two ends respectively, terminal can be contacted with the pressing plate of first clamping piece 303 and second clamping piece 304, and by pressing the protruding pressing piece 302, the elastic first clamping piece 303 and the second clamping piece 304 can be in concave deformation and are pressed on the folding angle of the pressing piece 302, simultaneously, the push plate of the protruding pressing piece 302 can pass through the aperture of the wiring shell 301, when the pressure of each elastic extrusion head by the pressing piece 302 needs to be removed, only the end of the push plate of the protruding pressing piece 302 needs to be pressed, so that the elastic arc-shaped plate of the first clamping piece 303 and the second clamping piece 304 is pushed and restored to the protruding mode.

2. The apparatus for remote monitoring and alarming of instrument tracing according to claim 1, characterized in that: The monitoring cable module (101) includes a 10Ω resistor (103), a 500Ω terminal resistor (104) and a bimetallic temperature control switch (105), the monitoring cable module (101) is connected with a 10Ω resistor (103) by a crimping tube at an interval of one meter, and the other end of the cable is connected with a bimetallic temperature control switch (105).

3. The apparatus for remote monitoring and alarming of instrument tracing according to claim 2, characterized in that: The monitoring cable module (101) is connected with a 500Ω terminal resistor (104) at the end, and the 500Ω terminal resistor (104) is connected with the 10Ω resistor (103) and the bimetallic temperature control switch (105).

4. The apparatus for remote monitoring and alarming of instrument tracing according to claim 3, characterized in that: The instrument loop module (102) includes a resistance meter (106) and a control power supply (107) connected with one end of the resistance meter (106), the monitoring cable (101) is connected with the resistance meter (106), and the bimetallic temperature control switch (105) is about 1 meter away from the resistance meter (106).

5. The apparatus for remote monitoring and alarming of instrument tracing according to claim 4, wherein: The control system module (201) includes a remote IO intelligent front end (204) and a DCS analog measurement point channel (205), and the analog measurement point output by the resistance meter (106) is connected with the multi-channel remote IO intelligent front end (204).

6. The apparatus for remote monitoring and alarming of instrument tracing according to claim 5, wherein: The resistance meter (106) is provided with a cable connected to the DCS analog measurement point channel (205) of the unit.

7. The apparatus for remote monitoring and alarming of instrument tracing according to claim 4 or 6, characterized in that: The warning module (202) comprises a display screen alarm (206) and an audible and visual alarm (207), and the display screen alarm (206) is electrically connected with the monitoring cable module (101) and the resistance meter (106).

8. The apparatus for remote monitoring and alarming of instrument tracing as claimed in claim 7 wherein: The audible and visual alarm (207) is arranged outside the instrument loop module (102) and is connected with the resistance meter (106).

9. The apparatus for remote monitoring and alarming of instrument tracing as claimed in claim 1 wherein: The first clamping piece (303) and the second clamping piece (304) are arranged in the wiring shell (301), and the pressing piece (302) is arranged on the upper side of the first clamping piece (303) and the second clamping piece (304).

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