Nuclear power station super-long rod temperature measuring circuit and device

Abstract

The utility model relates to a nuclear power station super-long pole temperature measuring circuit and device, the circuit comprises a plurality of multi-point temperature measuring assemblies, and each multi-point temperature measuring assembly comprises a plurality of platinum film resistors which are connected in parallel and have the same nominal resistance value; the multi-point temperature measurement assemblies are connected in series so as to form the ultra-long rod multi-point temperature measurement chain with the equivalent nominal resistance value being the set nominal resistance value. The resistance wire can replace the existing platinum wire type resistance wire, and the cost and the measurement difficulty of the characteristic test of the condenser are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to nuclear power station instrument technical field especially relates to a nuclear power station super long rod temperature measurement circuit and device. BACKGROUND

[0002] In nuclear power station, the condenser characteristic test purpose is to determine whether the condenser heat characteristics under the design condition reach the requirement, which is an important index of condenser heat characteristics. The condenser outlet seawater temperature monitoring is a key link in the condenser characteristic test, which needs to measure the average temperature of the outlet seawater pipeline cross section with a diameter of nearly 3m. Due to the long temperature measurement area and the poor working condition in the pipeline, the common temperature sensor on the market cannot realize the measurement of the average temperature in the nearly 3m area. At present, the nuclear power station usually adopts a 3m long platinum wire winding element fixedly packaged in a protective tube with a diameter of 6mm and a length of 3.2m, and connects by four-wire method to make a wire-wound super long rod platinum resistance thermometer. However, since the platinum wire is a precious metal, the cost is high, and the platinum wire needs to be wound in 3m length, which requires high winding technology. Once the winding is failed, the whole platinum wire is wasted, and the probability of defective products is high. Moreover, great care is needed in the subsequent use process to prevent the internal platinum wire of the super long rod platinum resistance from being damaged, which affects the measurement accuracy, resulting in high cost and great difficulty of the condenser characteristic test. UTILITY MODEL CONTENTS

[0003] The technical problem to be solved by the utility model is to provide a nuclear power station super long rod temperature measurement circuit and device.

[0004] The utility model adopts the technical scheme that a nuclear power station super long rod temperature measurement circuit is constructed, which comprises a plurality of multi-point temperature measurement components, wherein each multi-point temperature measurement component comprises a plurality of platinum thin film resistors which are connected in parallel and have the same nominal resistance value.

[0005] The multi-point temperature measurement components are connected in series to form a super long rod multi-point temperature measurement chain with an equivalent nominal resistance value of a set nominal resistance value.

[0006] Preferably, when the number of multi-point temperature measurement components is 3, each multi-point temperature measurement component comprises 3 platinum thin film resistors.

[0007] Preferably, when the number of multi-point temperature measurement components is 4, each multi-point temperature measurement component comprises 4 platinum thin film resistors.

[0008] Preferably, when the number of multi-point temperature measurement components is 5, 3 multi-point temperature measurement components comprise 4 platinum thin film resistors, and the remaining 2 multi-point temperature measurement components comprise 8 platinum thin film resistors.

[0009] Preferably, each of the platinum thin film resistors has a nominal resistance of 100Ω.

[0010] The utility model discloses still constructed a kind of nuclear power plant super-long rod temperature measuring device, including tubular protection piece, the tubular protection piece is equipped with above-mentioned nuclear power plant super-long rod temperature measurement circuit.

[0011] Preferably, the tubular protection piece is also provided with an insulating framework, and the plurality of platinum thin film resistors included in each multi-point temperature measurement component are fixed on the insulating framework in a linear type.

[0012] Preferably, the tubular protection piece is also filled with a heat transfer material for improving the heat transfer efficiency between the nuclear power plant super-long rod temperature measurement circuit and the outside world and preventing displacement of the insulating framework.

[0013] Preferably, the nuclear power plant super-long rod temperature measurement device further comprises a signal transmission line electrically connected to the nuclear power plant super-long rod temperature measurement circuit and an anti-kinking spring arranged between the signal transmission line and the tubular protection piece.

[0014] Preferably, the nuclear power plant super-long rod temperature measurement device further comprises an aviation plug assembly arranged on the signal transmission line and detachably connected.

[0015] The technical solution of the utility model forms a super-long rod multi-point temperature measurement chain by a plurality of platinum thin film resistors, each platinum thin film resistor can serve as a temperature measurement point to achieve multi-point temperature measurement, which helps to improve the accuracy of temperature measurement and can well replace the existing platinum wire type resistance wire. Moreover, the platinum thin film resistor has the advantages of low cost, small size, fast response speed, good consistency, strong flexibility in arrangement, etc., significantly reduces the cost of condenser characteristic test, and the number and position of temperature measurement points can be easily adjusted according to actual needs, which plays a positive role in improving measurement difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be described further below in combination with the drawings and examples, and in the drawings:

[0017] Figure 1 is the circuit structure block diagram of nuclear power plant super-long rod temperature measurement circuit in some examples of the utility model;

[0018] Figure 2 is the circuit principle diagram of first embodiment of nuclear power plant super-long rod temperature measurement circuit in the utility model;

[0019] Figure 3 is the circuit principle diagram of second embodiment of nuclear power plant super-long rod temperature measurement circuit in the utility model;

[0020] Figure 4It is the circuit principle diagram of the third embodiment of the nuclear power plant super-long rod temperature measurement circuit in the utility model.

[0021] Figure 5 It is the structural schematic diagram of the nuclear power plant super-long rod temperature measurement device in some embodiments of the utility model. DETAILED DESCRIPTION

[0022] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific embodiments of the utility model will be described in detail with reference to the drawings.

[0023] In the following description, it should be understood that the directions or position relations indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" are based on the directions or position relations shown in the drawings, constructed and operated in a particular direction, and are only for the convenience of describing the technical scheme, and cannot be understood as indicating that the devices or elements referred to must have a particular direction, therefore, it cannot be understood as a limitation on the utility model.

[0024] Figure 1 It is the circuit structure block diagram of the nuclear power plant super-long rod temperature measurement circuit in some embodiments of the utility model. The nuclear power plant super-long rod temperature measurement circuit can include a plurality of multi-point temperature measurement components 1, wherein, as shown in Figures 2 to 4 Each multi-point temperature measurement component 1 can include a plurality of platinum film resistors 11 which are connected in parallel and have the same nominal resistance value. The multi-point temperature measurement components 1 are connected in series to form a super-long rod multi-point temperature measurement chain with an equivalent nominal resistance value of a set nominal resistance value.

[0025] It should be noted that the purpose of designing the super-long rod multi-point temperature measurement chain with an equivalent nominal resistance value of a set nominal resistance value is to enable the super-long rod multi-point temperature measurement chain composed of different numbers or different circuit structures of multi-point temperature measurement components 1 to be replaced with each other in the condenser characteristic test, that is, the existing software algorithm for measuring the average temperature of the outlet seawater pipeline cross section does not need to be improved.

[0026] In order to enable the super-long rod multi-point temperature measurement chain to directly replace the existing platinum wire type resistance wire, the super-long rod multi-point temperature measurement chain can be designed such that the equivalent resistance thereof is equal to the nominal resistance value of a single platinum film resistor 11, and the nominal resistance value of each platinum film resistor 11 is equal to the nominal resistance value of the existing platinum wire type resistance wire. In one specific embodiment, the nominal resistance value of each platinum film resistor 11 can be 100Ω, and the model is preferably PT100. It should be noted that the platinum film resistor 11 is a temperature sensor, and the nominal resistance value refers to the actual resistance value of the platinum film resistor 11 at 0℃.

[0027] It should be noted that the specific circuit structure of the super-long rod multi-point temperature measurement chain can be determined according to actual needs, and theoretically, the more the number of platinum thin film resistors 11, the more the corresponding temperature measurement points, which helps to improve the measurement accuracy of the super-long rod multi-point temperature measurement chain. Among them, Figure 2 is a circuit principle diagram of a first embodiment of the nuclear power station super-long rod temperature measurement circuit in the utility model, Figure 3 is a circuit principle diagram of a second embodiment of the nuclear power station super-long rod temperature measurement circuit in the utility model, Figure 4 is a circuit principle diagram of a third embodiment of the nuclear power station super-long rod temperature measurement circuit in the utility model.

[0028] Please refer to Figure 2 When the number of multi-point temperature measurement assemblies 1 is 3, the number of platinum thin film resistors 11 included in each multi-point temperature measurement assembly 1 is 3. In this embodiment, the number of temperature measurement points is 9, and the equivalent nominal resistance value corresponding to the super-long rod multi-point temperature measurement chain is: R represents the nominal resistance value of the platinum thin film resistor 11, and R9 represents the equivalent nominal resistance value of the super-long rod multi-point temperature measurement chain in the first embodiment. Although the number of temperature measurement points in this embodiment is relatively small, it has the characteristics of the lowest cost and the lowest temperature measurement accuracy.

[0029] Please refer to Figure 3 When the number of multi-point temperature measurement assemblies 1 is 4, the number of platinum thin film resistors 11 included in each multi-point temperature measurement assembly 1 is 4. In this embodiment, the number of temperature measurement points is 16, and the equivalent nominal resistance value corresponding to the super-long rod multi-point temperature measurement chain is: R 16 represents the equivalent nominal resistance value of the super-long rod multi-point temperature measurement chain in the second embodiment. Although the number of temperature measurement points in this embodiment is relatively large, it has the characteristics of relatively low cost and relatively high temperature measurement accuracy.

[0030] Please refer to Figure 4 When the number of multi-point temperature measurement assemblies 1 is 5, 3 of the multi-point temperature measurement assemblies 1 include 4 platinum thin film resistors 11, and the remaining 2 multi-point temperature measurement assemblies 1 include 8 platinum thin film resistors 11. In this embodiment, the number of temperature measurement points is 28, and the equivalent nominal resistance value corresponding to the super-long rod multi-point temperature measurement chain is: R 28 represents the equivalent nominal resistance value of the super-long rod multi-point temperature measurement chain in the third embodiment. Although the number of temperature measurement points in this embodiment is the largest among the three embodiments, it has the characteristics of high cost and very high temperature measurement accuracy.

[0031] It is easy to understand that the staff can choose the first to third embodiment according to the actual demand. Of course, in order to continue to improve the temperature measurement accuracy, the nuclear power plant super long rod temperature measurement circuit can also be composed of a larger number of platinum thin film resistors.

[0032] It should be noted that all platinum thin film resistors 11 included in each multi-point temperature measurement assembly 1 are connected in parallel with each other, and can be specifically referred to Figures 2 to 4 Embodiments, which will not be repeated here.

[0033] It is easy to understand that the utility model discloses a plurality of platinum thin film resistors are composed of super long rod multi-point temperature measurement chain, and each platinum thin film resistor can be used as a temperature measurement point to realize multi-point temperature measurement, which helps to improve the temperature measurement accuracy, can be a good alternative to the existing platinum wire type resistance wire, and the platinum thin film resistor has the advantages of low cost, small size, fast response speed, good consistency, strong flexibility, etc. The cost of condenser characteristic test is significantly reduced, and the number and position of temperature measurement points are convenient to adjust according to actual demand, which plays a positive role in improving the measurement difficulty, and the measurement precision setting can reach 1 / 3B level, 1 / 10B level.

[0034] Figure 5 It is the structure diagram of the nuclear power plant super long rod temperature measurement device in some embodiments of the utility model. The nuclear power plant super long rod temperature measurement device can include a cylindrical protective member 2, and the cylindrical protective member 2 is provided with the utility model improved nuclear power plant super long rod temperature measurement circuit.

[0035] In one embodiment, as shown in Figure 5 The cylindrical protective member 2 is also provided with an insulating framework 3, and a plurality of platinum thin film resistors 11 included in each multi-point temperature measurement assembly 1 are fixed in a linear type on the insulating framework 3. Specifically, the insulating framework 3 can be in a linear type and fixed in the cylinder of the cylindrical protective member 2, so that all platinum thin film resistors 11 are distributed in a linear type on the insulating framework 3 to achieve the purpose of fixation. It is easy to understand that the insulating framework 3 can be composed of PA66, PBT and other materials, as long as the insulating performance and strength meet the requirements.

[0036] In some embodiments, as shown in Figure 2As shown, the tubular protective member 2 is also filled with heat transfer filling material 4 for improving the heat transfer efficiency between the nuclear power plant super-long rod temperature measurement circuit and the outside. As can be easily understood, under the action of the heat transfer filling material 4, the heat of the seawater outside the tubular protective member 2 can be more efficiently transferred to the platinum thin film resistor 11, that is, the heat transfer filling material 4 can play a role in improving the heat transfer efficiency, thereby improving the temperature measurement accuracy. Moreover, since the tubular protective member 2 will be impacted by seawater during temperature measurement, vibration will occur, which greatly increases the risk of deformation and falling of the devices in the tubular protective member 2. Therefore, the heat transfer filling material 4 can be filled as much as possible in the barrel of the tubular protective member 2 to further fix the insulating framework 3 and each platinum thin film resistor 11. In this way, not only can the displacement of the insulating framework 3 and each platinum thin film resistor 11 be prevented, but also the role of buffering vibration can be played, which can effectively improve the reliability and pressure resistance of the nuclear power plant super-long rod temperature measurement device. The heat transfer filling material 4 can be heat-conducting silica gel.

[0037] In some embodiments, as shown in the drawings, the nuclear power plant super-long rod temperature measurement device can further include a signal transmission line 5 electrically connected to the nuclear power plant super-long rod temperature measurement circuit and a breakage-preventing spring 6 arranged between the signal transmission line 5 and the tubular protective member 2. The signal transmission line 5 can be a shielding line to improve the transmission quality of the signal. The breakage-preventing spring 6 can be a stainless steel spring, which can facilitate the installation and adjustment of the tubular protective member 2 on site. Figure 5

[0038] In one embodiment, the tubular protective member 2 can be made of a 316L stainless steel cylinder. The end of the tubular protective member 2 away from the signal transmission line 5 is closed, and the end of the tubular protective member 2 close to the signal transmission line 5 is provided with an opening so that the super-long rod multi-point temperature measurement chain in the barrel can be electrically connected to the signal transmission line 5. It should be noted that, as shown in the drawings, the two ends of the super-long rod multi-point temperature measurement chain are respectively connected to two wires to realize resistance measurement by the existing four-wire measurement resistance method. For specific implementation, please refer to the existing technology, which will not be described here. Figures 2 to 4

[0039] Since the part (specifically, the left part of the aviation plug assembly 7, referred to as the vulnerable part) installed on site of the outlet seawater pipeline will be impacted by seawater and has a high probability of damage, in order to facilitate replacement of the damaged part, in some embodiments, as shown in the drawings, the nuclear power plant super-long rod temperature measurement device can further include an aviation plug assembly 7 arranged on the signal transmission line 5 and detachably connected. Specifically, the aviation plug assembly 7 can be composed of an aviation female head and an aviation male head, so that the staff can directly replace the vulnerable part when it is damaged. Figure 5 Figure 5

[0040] ​​​​It can be understood that the above embodiment only expresses the preferred embodiment of the utility model, the description is more specific and detailed, but it can not be understood as the limitation of the utility model patent scope; it should be pointed out that for ordinary skilled person in the art, the above technical features can be freely combined without departing from the concept of the utility model, and a number of deformations and improvements can be made, which belong to the protection scope of the utility model; therefore, any equivalent transformation and modification within the scope of the utility model patent claim should belong to the scope of the utility model patent claim.

Claims

1. A temperature measurement circuit for an ultra-long rod in a nuclear power plant, characterized in that, It includes multiple multi-point temperature measurement components (1), wherein each of the multi-point temperature measurement components (1) includes multiple platinum thin film resistors (11) connected in parallel with each other and having the same nominal resistance value; Each of the multi-point temperature measuring components (1) is connected in series to form an ultra-long rod multi-point temperature measuring chain with an equivalent nominal resistance value of a set nominal resistance value.

2. The nuclear power plant ultra-long rod temperature measurement circuit according to claim 1, characterized in that, When the number of the multi-point temperature measuring components (1) is 3, each multi-point temperature measuring component (1) includes 3 platinum thin film resistors (11).

3. The nuclear power plant ultra-long rod temperature measurement circuit according to claim 1, characterized in that, When the number of the multi-point temperature measuring components (1) is 4, each multi-point temperature measuring component (1) includes 4 platinum thin film resistors (11).

4. The nuclear power plant ultra-long rod temperature measurement circuit according to claim 1, characterized in that, When the number of the multi-point temperature measuring components (1) is 5, the number of platinum thin film resistors (11) included in 3 of the multi-point temperature measuring components (1) is 4, and the number of platinum thin film resistors (11) included in the remaining 2 of the multi-point temperature measuring components (1) is 8.

5. The nuclear power plant ultra-long rod temperature measurement circuit according to any one of claims 1 to 4, characterized in that, Each of the platinum thin-film resistors (11) has a nominal resistance of 100Ω.

6. A temperature measuring device for an ultra-long rod in a nuclear power plant, characterized in that, It includes a cylindrical protective component (2), which is provided with a temperature measurement circuit for an ultra-long pole of a nuclear power plant as described in any one of claims 1 to 5.

7. The nuclear power plant ultra-long rod temperature measuring device according to claim 6, characterized in that, The cylindrical protective component (2) is also provided with an insulating frame (3), and the multiple platinum thin film resistors (11) included in each multi-point temperature measuring component (1) are fixed on the insulating frame (3) in a straight line.

8. The nuclear power plant ultra-long rod temperature measuring device according to claim 7, characterized in that, The cylindrical protective component (2) is also filled with heat transfer filling material (4) to improve the heat transfer efficiency between the temperature measurement circuit of the nuclear power plant's ultra-long rod and the outside world.

9. The nuclear power plant ultra-long rod temperature measuring device according to any one of claims 6 to 8, characterized in that, It also includes a signal transmission line (5) electrically connected to the temperature measurement circuit of the nuclear power plant's extra-long rod, and an anti-bending spring (6) disposed between the signal transmission line (5) and the cylindrical protective member (2).

10. The nuclear power plant ultra-long rod temperature measuring device according to claim 9, characterized in that, It also includes an aviation plug assembly (7) that is detachably connected to the signal transmission line (5).

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