CN218724840U - Temperature measuring device and system of built-in header of pressure vessel - Google Patents
Temperature measuring device and system of built-in header of pressure vessel Download PDFInfo
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- CN218724840U CN218724840U CN202223140103.7U CN202223140103U CN218724840U CN 218724840 U CN218724840 U CN 218724840U CN 202223140103 U CN202223140103 U CN 202223140103U CN 218724840 U CN218724840 U CN 218724840U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model discloses a temperature measuring device and system of built-in header of pressure vessel, relate to the thermocouple mode and measure, this scheme carries out the structural improvement of measuring device based on current measurement principle, survey buret through the direction that matches with the thermocouple and carry on spacingly and direction to the thermocouple, avoid thermocouple head to break away from the measurement position and arouse measuring error in the measurement process, guarantee the seal and the measurement accuracy in the built-in header, can make the experimental header temperature of transient state reactor thermotechnical hydraulic system obtain the accurate measurement under the operating mode of complicacy, the thermocouple can be dismantled simultaneously, be convenient for in time change and maintenance.
Description
Technical Field
The utility model relates to a temperature measurement technical field, concretely relates to temperature measurement device and system of built-in header of pressure vessel.
Background
The nuclear reactor thermal hydraulic system test usually comprises a primary loop system and a secondary loop system, wherein the most important equipment in the primary loop system is a pressure vessel. A header is arranged in part of the pressure vessel, and the temperature measurement (thermocouple measurement mode) in the header is of great significance to the research on the characteristics of the reactor system. The thermocouple measures temperature by means of the head to detect temperature, so that the head needs to be inserted into the position where the temperature is measured.
The following requirements are provided for measuring the temperature of the built-in header: the bearing pressure of the pressure container is generally more than 15MPa, and the pressure in the built-in header is also higher, so that a temperature sensor (thermocouple) needs to penetrate through two layers of pressure containers, the requirement on the sealing performance of a temperature measuring structure is higher, in order to ensure the sealing performance of the built-in header, a temperature measuring head of the built-in header generally adopts a non-penetrating structure, leakage flow caused by sealing failure is prevented, the temperature is measured by the non-penetrating structure, and the temperature is generally measured in an indirect measuring mode, namely, the temperature of a built-in pipeline wall is measured indirectly.
Although the existing thermocouple measuring structure can meet the requirements, the following problems exist:
the existing thermocouple is of a non-detachable welding structure after being installed, and the temperature measuring part of the thermocouple is arranged at the head part, so that the head part needs to be attached to the wall surface of the measuring tube when the temperature of the wall of the pipeline is measured by the thermocouple. Therefore, in use, the thermocouple and the measuring joint are generally welded after being installed, and the thermocouple is ensured to be tightly attached to the measuring surface. The thermocouple is installed in the structure in a welding mode, when the thermocouple fails, the thermocouple cannot be simply replaced, and the original structure must be cut off and then welded again.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the existing thermocouple is of a non-detachable welding structure after being installed, and when the thermocouple measures the wall temperature of a pipeline, a measuring component at the head needs to be attached to the wall surface of a measuring pipe, so that the measuring component is difficult to attach to the wall surface in the using process, and the head of the thermocouple is easy to separate from the measuring part to cause measuring errors; an object of the utility model is to provide a temperature measurement device and system of built-in header of pressure vessel carries out structural improvement based on current thermocouple measurement structure, provides a reliable detachable construction to survey buret and lead to solving above-mentioned technical problem to the thermocouple for curved direction through addding the internal face.
The utility model discloses a following technical scheme realizes:
this scheme provides a temperature measuring device of built-in header of pressure vessel, includes: a guide measuring tube and a thermocouple measuring piece; one end of the guide measuring pipe is sealed, the other end of the guide measuring pipe is open, and the aperture of the opening is matched with the thermocouple measuring piece; the direction survey buret is installed on built-in header, and the sealed end of direction survey buret stretches into in the built-in header, the thermocouple measuring piece passes behind the pressure vessel and stretches into in order to carry out the temperature measurement in the built-in header from the open end of direction survey buret.
The working principle of the scheme is as follows: the existing thermocouple is of a non-detachable welding structure after being installed, and when the thermocouple measures the wall temperature of a pipeline, a measuring part at the head part needs to be attached to the wall surface of a measuring pipe, so that the measuring part is difficult to attach to the wall surface in the using process, and the head part of the thermocouple is easy to separate from the measuring part to cause measuring errors; the utility model aims to provide a temperature measurement device and system of built-in header of pressure vessel, carry out the improvement on the measuring device structure based on current measurement principle, carry on spacing and direction to the thermocouple through the direction survey pipe that matches with the thermocouple, avoid thermocouple head to break away from the measuring position and cause the measuring error in the measurement process, guarantee the seal and measure the accuracy in the built-in header; meanwhile, the guide measuring pipe is arranged in a built-in header of a pressure container to be measured, and the thermocouple measuring piece can realize a detachable function and is convenient to replace and maintain in time.
The thermocouple measuring element measures the temperature of the inner wall surface of the guide measuring tube, thereby indirectly measuring the temperature in the header. Because the inner wall of the traditional measuring pipe is of a straight pipe structure, when a thermocouple is installed, the thermocouple can only be directly inserted, and a certain axial force is applied, so that the head of the thermocouple is ensured to be tightly attached to the inner wall surface of the measuring pipe. When force is not applied properly, the thermocouple is easily damaged, and when the measuring tube works for a long time, the measuring tube is heated and extends, so that the head of the thermocouple cannot be tightly attached, and the measurement is invalid; in the scheme, the thermocouple is inserted along the guide pipe, and the guide measuring pipe matched with the thermocouple through the caliber pre-bending and guiding are used for pre-bending the thermocouple. After the thermocouple is pre-bent in the installation process, a certain resilience force is generated, so that the thermocouple can be effectively tightly attached to the inner wall of the measuring pipe in long-term work. The phenomenon that the head of the thermocouple cannot be attached to the head of the traditional measuring tube after the traditional measuring tube is heated and elongated is avoided; and the installation does not need to adopt larger axial force, and the head can not be damaged easily when the thermocouple is installed.
The thermocouple measuring piece in the scheme is not directly fixed on the guide measuring pipe, and can be flexibly detached and replaced when the thermocouple measuring piece is damaged.
The matching of the opening diameter of the guide measuring tube with the thermocouple measuring element means that the opening diameter of the guide measuring tube is sufficient for the thermocouple measuring element to protrude into the interior, as a preference the opening of the guide measuring tube is slightly larger than the cross section of the thermocouple measuring element.
The further optimization scheme is that the inner cavity of the guide measuring pipe comprises a guide cavity section and an extension cavity section which are communicated, the guide cavity section is located at the sealing end of the guide measuring pipe, and the extension cavity section is located at the opening end of the guide measuring pipe.
Traditional non-penetrating structure does not have the direction chamber, the thermocouple stretches into back direct contact, after careless or the multiple measurement, non-penetrating structure is damaged very easily, it has a great deal of inconvenient part again to change, the direction survey pipe that this scheme of use provided, extend the chamber section on the one hand and extend and provide the temperature that bearing space is convenient for measure built-in header for the thermocouple measuring part in getting into built-in header, on the other hand direction chamber section stretches into the thermocouple measuring part and has played the effect of buffering and direction to the process of arriving at the measuring point, direction chamber section and extension chamber section have provided the mounting means of taking the pretightning force for the thermocouple measuring part, avoid exerting oneself excessively to damage the direction survey pipe.
The outer wall of the head of the guide measuring pipe can be regarded as a temperature measuring position, the thermocouple measuring piece penetrates through the pressure container and then extends into the inner wall surface of the head from the opening end of the guide measuring pipe to measure the temperature in the built-in header, the traditional non-penetrating structure does not have an arc-shaped guide cavity, the thermocouple keeps a linear form after extending into the guide measuring pipe, and the thermocouple only depends on the axial pretightening force provided when viewing the device and clings to the inner wall surface of the head of the measuring pipe. The thermocouple head is easy to damage during installation, and the measuring tube cannot be effectively attached after being heated and expanded when the thermocouple is used for a long time. The direction of this scheme of use provides surveys buret adopts curved direction chamber to carry out the preflex to the thermocouple, has reduced the damage of great axial force to the thermocouple head in the installation, and direction chamber section and extension chamber section provide the mounting means of taking the pretightning force for the thermocouple measuring part, can guarantee when long-term the use, even survey buret thermal expansion, the pretightning force that the thermocouple preflex formed also can guarantee that the thermocouple can effectually hug closely on the inner wall.
The temperature measuring part of the thermocouple is arranged at the head part, so the head part needs to be attached to the wall surface of the measuring tube when the thermocouple measures the wall temperature of the pipeline, and the thermocouple head part arranged on the inner wall of the guide measuring tube can not be welded on the wall surface of the guide measuring tube because the thermocouple needs to be replaced when being damaged, and is generally arranged in a close fit manner. Because factors such as installation error, pipeline thermal deformation, the wall often can't be hugged closely to the in use, causes pressure vessel working process, and the head of thermocouple measuring piece has broken away from the measurement position, causes measuring error, and this scheme provides the installation space of taking the pretightning force for thermocouple measuring piece through direction chamber section and extension chamber section, has effectively avoided above-mentioned condition, guarantees measuring reliability and accuracy.
The further optimization scheme is that the guide cavity section is conical, and the cross-sectional area of the guide cavity section is gradually reduced along the direction of the sealing end of the guide measuring tube.
The guide cavity section with the gradually reduced cross-sectional area can ensure that the head of the thermocouple measuring piece always contacts the measuring part.
Preferably, the wall thickness of the guide measuring tube on the outer wall of the guide chamber section can be constant, i.e. the outer diameter of the guide measuring tube decreases as the cross-sectional area of the guide chamber section decreases, or the outer diameter of the guide measuring tube can be constant.
In a further preferred embodiment, the extended cavity section has a centerline, and the centerline is a curve.
The central line of the extension cavity section is a curve, namely the inner wall of the guide measuring pipe is bent, so that the thermocouple measuring piece is naturally bent when being inserted, a certain pre-tightening force is provided, and the thermocouple measuring head is guaranteed to be pressed on the wall surface all the time.
The further optimization scheme is that the method further comprises the following steps: the thermocouple measuring device comprises a first thermocouple joint and a second thermocouple joint, wherein the second thermocouple joint is welded on the surface of the pressure vessel, and a thermocouple measuring piece penetrates through the pressure vessel after penetrating through the second thermocouple joint; the first thermocouple joint is welded on the surface of the built-in header, and the thermocouple measuring piece penetrates through the first thermocouple joint and then extends into the guide measuring pipe to measure the temperature.
In a further preferred embodiment, the first thermocouple junction has a thermocouple cavity, which is connected in a matched manner to the guide cavity section of the guide measuring tube.
The further optimization scheme is that the guide measuring pipe is welded on the wall of the built-in header, and the built-in header is sealed. The built-in header adopts welded direction survey buret, prevents that first thermocouple connects when sealed the inefficacy, and pressure vessel and built-in header are colluded.
The further optimization scheme is that the thermocouple measuring part is a strip-shaped flexible measuring part with the diameter smaller than 4 mm.
The further optimization scheme is that the guide measuring pipe extends into the built-in header from the bottom surface of the built-in header, and the extending height is at least 20mm.
In order to ensure that the measured temperature can represent the temperature of the built-in header more accurately, the guide measuring tube should extend at least 1/4 of the height of the built-in header.
The scheme also provides a temperature measuring system of the pressure container built-in header, which comprises the temperature measuring device of the pressure container built-in header.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model provides a pair of temperature measurement device and system of built-in header of pressure vessel, this scheme carries out the structural improvement of measuring device based on current measurement principle, survey buret through the direction that matches with the thermocouple and carry on spacingly and direction to the thermocouple, avoid thermocouple head to break away from the measurement site and arouse measuring error in the measurement process, guarantee the seal in the built-in header and measure the accuracy, can make the header temperature in the transient response reactor thermal hydraulic system is experimental obtain the accurate measurement under the operating mode of complicacy, the thermocouple can be dismantled simultaneously, be convenient for in time change and maintenance.
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 view of the assembly of a temperature measuring device with a header built in a pressure vessel;
FIG. 2 is a schematic view A of the temperature measuring device partially assembled in a built-in header section;
FIG. 3 is a schematic view B of the temperature measuring device partially assembled in the built-in header portion;
fig. 4 is a schematic view of a guided measurement tube configuration.
Reference numbers and corresponding part names in the drawings:
1-a guide measuring tube, 11-a guide cavity section, 12-an extension cavity section, 2-a thermocouple measuring part, 3-a first thermocouple joint, 31-a thermocouple cavity, 4-a second thermocouple joint, 5-a pressure container and 6-a built-in header.
Detailed Description
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 the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1
The present embodiment 1 provides a temperature measuring device for a header built in a pressure vessel, as shown in fig. 1 and 2, including: a guide measuring tube 1 and a thermocouple measuring element 2; one end of the guide measuring pipe 1 is sealed, the other end of the guide measuring pipe is open, and the aperture of the opening is matched with the thermocouple measuring piece 2; the direction survey buret 1 is installed on built-in header 6, and the sealed end of direction survey buret stretches into in built-in header 6, thermocouple measuring piece 2 passes behind pressure vessel 5 and stretches into in order to develop the temperature measurement in built-in header 6 from the open end of direction survey buret 1.
As shown in fig. 4, the inner cavity of the guide measuring tube 1 comprises a communicating guide cavity section 11 and an extension cavity section 12, the guide cavity section 11 being located at the sealed end of the guide measuring tube 1, and the extension cavity section 12 being located at the open end of the guide measuring tube 1.
The guide cavity section 11 is conical, and the cross-sectional area of the guide cavity section 11 is gradually reduced along the direction of the sealing end of the guide measuring pipe.
The temperature measuring parts of the thermocouples are concentrated at the head part, so the head part needs to be tightly attached to the wall surface of the measuring tube when the thermocouples measure the wall temperature of the pipeline, and the head part of the thermocouples arranged on the inner wall of the guide measuring tube cannot be welded on the wall surface of the guide measuring tube because the thermocouples need to be replaced when the thermocouples are damaged, and is generally arranged in a tight fit manner. When the installation force is improper, the head of the thermocouple is easily damaged, and the measurement is failed. Even if the thermocouple measuring device is successfully installed, the head of the thermocouple often cannot be tightly attached to the wall surface due to factors such as heating deformation of the measuring tube and the like in long-term use, so that the head of the thermocouple measuring piece is separated from a measuring part, and measuring errors are caused; in the embodiment, the installation method with the pretightening force is provided for the thermocouple measuring piece through the guide cavity section and the extension cavity section, so that the situation is effectively avoided, and the reliability and the accuracy of measurement are ensured.
Example 2
As shown in fig. 3 and 4, the present embodiment differs from the previous embodiment in that the extended cavity section 12 has a centerline that is curved.
Further comprising: the thermocouple measuring device comprises a first thermocouple joint 3 and a second thermocouple joint 4, wherein the second thermocouple joint 4 is welded on the surface of a pressure vessel, and a thermocouple measuring part 2 penetrates through the pressure vessel after penetrating through the second thermocouple joint 4; the first thermocouple joint 3 is welded on the surface of the built-in header, and the thermocouple measuring piece 2 penetrates through the first thermocouple joint 3 and then extends into the guide measuring tube 1 to perform temperature measurement.
The first thermocouple connection 3 has a thermocouple cavity 31, which thermocouple cavity 31 is in matching communication with the guide cavity section 11 of the guide measuring tube.
The guide measuring tube 1 is welded on the wall of the built-in header, and the built-in header keeps sealing.
The thermocouple measuring part 2 is a strip-shaped flexible measuring part with the diameter smaller than 4 mm.
The guide measuring pipe 1 extends into the built-in header from the bottom surface of the built-in header, and the extending height is at least 20mm.
The inner measuring structure of the reliable and effective guide measuring tube is characterized in that the guide measuring tube welded on the built-in header adopts a special design, the guide conical hole at the head part of the guide measuring tube ensures that the head part of the thermocouple can be effectively inserted into a measuring part, the inner tube wall corresponding to the extension cavity section of the guide conical hole has a certain radian, the guide conical hole helps the thermocouple to be pre-bent to form a natural arc when the thermocouple is installed, a pre-tightening force is formed, and the head part of the thermocouple is ensured to be tightly attached to the measuring part during the working period; the radian requirement of the inner wall surface can be formed by extruding and bending the original straight extension cavity section or by a special processing mode.
Example 3
The temperature measuring system of the pressure vessel built-in header comprises the temperature measuring device of the pressure vessel built-in header described in the above embodiment. The embodiment is a temperature measuring system of a built-in header of a pressure vessel, which is designed to meet the requirement of temperature measurement of the built-in header of the pressure vessel in a reactor thermal hydraulic transient experiment. The temperature measuring structure can ensure that the temperature of the internal fluid of the built-in header of the high-pressure container is measured under the high-temperature and high-pressure test environment of the reactor thermal hydraulic power, and meanwhile, the thermocouple can be replaced after the test is finished.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A temperature measuring device of a built-in header of a pressure vessel is characterized by comprising: a guide measuring tube (1) and a thermocouple measuring element (2);
one end of the guide measuring pipe (1) is sealed, the other end of the guide measuring pipe is open, and the caliber of the opening is matched with the thermocouple measuring piece (2); the utility model discloses a temperature measurement of a thermocouple measuring piece, including leading survey buret (2), thermocouple measuring piece, leading survey buret (1) is installed on built-in header, and the sealed end of leading survey buret stretches into in the built-in header, thermocouple measuring piece (2) pass behind the pressure vessel and stretch into in order to develop the temperature measurement in the built-in header from the open end of leading survey buret.
2. A temperature measuring device of a built-in header of a pressure vessel according to claim 1, characterized in that the inner cavity of the guide measuring tube (1) comprises a guide cavity section (11) and an extension cavity section (12) communicating with each other, the guide cavity section (11) being located at the sealed end of the guide measuring tube and the extension cavity section (12) being located at the open end of the guide measuring tube.
3. A temperature measuring device of a built-in header of a pressure vessel according to claim 2, characterized in that the guide chamber section (11) is tapered, and the cross-sectional area of the guide chamber section (11) is gradually reduced in the direction of the sealed end of the guide measuring tube.
4. The temperature measuring device of a pressure vessel internal header as recited in claim 2, wherein said extended cavity section (12) has a centerline, said centerline being curvilinear.
5. The temperature measuring device of the built-in header of the pressure vessel as claimed in claim 3, further comprising: a first thermocouple junction (3) and a second thermocouple junction (4);
the second thermocouple joint (4) is welded on the surface of the pressure vessel, and the thermocouple measuring piece (2) penetrates through the pressure vessel after penetrating through the second thermocouple joint (4);
the first thermocouple joint (3) is welded on the surface of the built-in header, and the thermocouple measuring piece (2) penetrates through the first thermocouple joint (3) and then extends into the guide measuring pipe (1) to perform temperature measurement.
6. A temperature measuring device of a pressure vessel built-in header according to claim 5, characterized in that the first thermocouple junction (3) has a thermocouple cavity (31), the thermocouple cavity (31) being in matching communication with a guide cavity section (11) of a guide measuring tube.
7. A temperature measuring device of a built-in header of a pressure vessel according to claim 1, characterized in that the guide measuring tube (1) is welded to the wall of the built-in header and the built-in header is kept sealed.
8. The temperature measuring device of the pressure vessel built-in header according to claim 1, wherein the thermocouple measuring part (2) is a strip-shaped elastic measuring part with a diameter of less than 4 mm.
9. A temperature measuring device of a built-in header of a pressure vessel according to claim 1, characterized in that the guide measuring tube (1) extends into the built-in header from the bottom surface of the built-in header to a height of at least 20mm.
10. A temperature measurement system of a pressure vessel built-in header, characterized by comprising the temperature measurement device of a pressure vessel built-in header according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223140103.7U CN218724840U (en) | 2022-11-25 | 2022-11-25 | Temperature measuring device and system of built-in header of pressure vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223140103.7U CN218724840U (en) | 2022-11-25 | 2022-11-25 | Temperature measuring device and system of built-in header of pressure vessel |
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| Publication Number | Publication Date |
|---|---|
| CN218724840U true CN218724840U (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223140103.7U Active CN218724840U (en) | 2022-11-25 | 2022-11-25 | Temperature measuring device and system of built-in header of pressure vessel |
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| CN (1) | CN218724840U (en) |
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- 2022-11-25 CN CN202223140103.7U patent/CN218724840U/en active Active
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