CN113295353A - Gas detection method and gas detection device of heat exchanger - Google Patents
Gas detection method and gas detection device of heat exchanger Download PDFInfo
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- CN113295353A CN113295353A CN202110534504.1A CN202110534504A CN113295353A CN 113295353 A CN113295353 A CN 113295353A CN 202110534504 A CN202110534504 A CN 202110534504A CN 113295353 A CN113295353 A CN 113295353A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
Abstract
The invention discloses an air detection method and an air detection device of a heat exchanger, wherein the heat exchanger comprises a plurality of independent heat exchange channels, and the air detection method comprises the following steps: opening the heat exchange channels at intervals, and flushing quantitative gas; after the air inflation is finished, acquiring the air pressure change in the plurality of heat exchange channels within a preset time, and determining whether the air cross phenomenon exists between the adjacent heat exchange channels according to the air pressure change. The gas detection method of the heat exchanger can quickly position the gas leakage position, solves the gas leakage problem, can perform gas leakage detection among the heat exchange channels at one time, greatly improves the gas leakage detection efficiency, realizes simultaneous detection of multiple loops, is suitable for the heat exchangers with different numbers of heat exchange channels, and has the advantages of wide application range, simple operation and high gas detection efficiency.
Description
Technical Field
The invention relates to the technical field of heat exchanger detection, in particular to a gas detection method and a gas detection device of a heat exchanger.
Background
With the diversified development of air conditioning systems, the heat exchanger is a key part of an air conditioner. The heat exchanger is provided with a cooling loop and a plurality of heat exchange loops to increase the heat exchange area and the cold quantity, and leakage cannot occur between the heat exchange loops, otherwise the performance of the air conditioning system is seriously influenced. Meanwhile, each loop is required to be synchronously subjected to pressure test for checking the strength and stability of the product, checking whether a leakage point exists in the system and the like.
At present, in the production and processing process of a heat exchanger, a manual pressurizing mode is usually adopted to detect the gas leakage and pressure test among loops. The manual pressing mode has the following problems:
(1) the pressure is not controlled, and the pressure between two adjacent systems easily exceeds an allowable pressure value during gas detection and leakage, so that permanent damage is caused to a sealing surface;
(2) when the multi-loop heat exchange system detects the cross gas, the multi-loop heat exchange system needs to be inflated once every other loop, so that the operation procedure is complicated, and the efficiency is extremely low;
(3) after detection, people need to stare at the detection device, effective safety isolation cannot be achieved, and personal safety of staff cannot be guaranteed;
(4) the pressure fluctuation range is small, and the pressure fluctuation range cannot be detected, so that the quality hidden trouble is caused.
Disclosure of Invention
The technical problem that the pressure is not controlled in a gas leakage and pressure test detection mode in the prior heat exchanger in the background art in a manual pressurizing mode is solved. The invention provides a heat exchanger gas detection method and a gas detection device, which can quickly position a gas leakage position, solve the gas leakage problem, carry out gas leakage detection between heat exchange channels at one time, greatly improve the gas leakage detection efficiency and realize simultaneous detection of multiple loops.
In order to achieve the purpose, the specific technical scheme of the gas detection method and the gas detection device of the heat exchanger is as follows:
an air detection method of a heat exchanger, wherein the heat exchanger comprises a plurality of independent heat exchange channels, and the air detection method comprises the following steps:
opening the heat exchange channels at intervals, and flushing quantitative gas;
after the air inflation is finished, acquiring the air pressure change in the plurality of heat exchange channels within a preset time, and determining whether the air cross phenomenon exists between the adjacent heat exchange channels according to the air pressure change.
Further, in the step of determining whether a gas cross-over phenomenon exists between adjacent heat exchange channels according to the air pressure change, when the obtained air pressure in a certain heat exchange channel is not changed, a gas cross-over phenomenon does not exist between the heat exchange channel and the heat exchange channel adjacent to the heat exchange channel.
Further, in the step of determining whether a gas cross-over phenomenon exists between adjacent heat exchange channels according to the air pressure change, if it is obtained that the air pressure value in a certain unaerated heat exchange channel is increased, a gas cross-over phenomenon exists between the adjacent aerated heat exchange channels of the unaerated heat exchange channel.
Further, if the air pressure value of one of the air-filled heat exchange channels is reduced and the air pressure value of the other air-filled heat exchange channel is unchanged, air mixing exists between the air-filled heat exchange channel with the reduced air pressure value and the non-air-filled heat exchange channel; if the air pressure values of the two air-filled heat exchange channels are reduced, air leakage exists between the three heat exchange channels.
Further, the method also comprises a reminding step: and when the obtained air pressure value in the air inflation heat exchange channel is lower than a preset air pressure threshold value, starting an alarm component.
Further, the air pressure change in the heat exchange channel is obtained through an air pressure detection component arranged in the heat exchange channel.
The utility model provides a heat exchanger gas detection device, the heat exchanger includes many independent heat transfer passageways, and heat transfer passageway one end is sealed, and the gas detection device includes the gas tube, and the gas tube is connected with heat transfer passageway, still includes the atmospheric pressure detection part that is used for detecting the interior atmospheric pressure change of heat transfer passageway.
Furthermore, the two ends of the heat exchanger are respectively provided with an end plate, the end plates are connected with a tube box in a sealing mode, the inner wall of the tube box is provided with a plurality of sealing holes, and the sealing holes are in one-to-one correspondence and sealing connection with the heat exchange channels respectively.
Furthermore, a sealing hole far away from the direction of the shell is communicated with an inflation tube, and the inflation tube is provided with a switch valve.
Further, the air pressure detection component is a pressure sensor or a wind speed sensor and is electrically connected with the control component.
Furthermore, the gas detection device also comprises an alarm component which is electrically connected with the control component.
The gas detection method and the gas detection device of the heat exchanger have the following advantages:
the gas detection method of the heat exchanger can quickly position the gas leakage position, solves the gas leakage problem, can perform gas leakage detection among the heat exchange channels at one time, greatly improves the gas leakage detection efficiency, realizes multi-loop simultaneous detection, is suitable for the heat exchangers with different numbers of heat exchange channels, and has the advantages of wide application range, simple operation and high gas detection efficiency.
Drawings
FIG. 1 is a flow chart of a method of gas detection for a heat exchanger of the present invention;
FIG. 2 is a schematic structural diagram of a gas detection device of the heat exchanger of the present invention;
FIG. 3 is a side view of a heat exchanger gas detection apparatus of the present invention;
FIG. 4 is a cross-sectional view of a heat exchanger according to the present invention;
FIG. 5 is a schematic view of the tube box of the present invention;
FIG. 6 is a cross-sectional view taken along plane A-A of FIG. 5;
FIG. 7 is an enlarged view at C of FIG. 6;
fig. 8 is a cross-sectional view taken along plane B-B of fig. 5.
The reference numbers in the figures illustrate: 1. a housing; 11. an end plate; 12. a heat exchange pipe; 2. a pipe box; 21. sealing the hole; 211. a connecting port; 212. a transfer groove; 22. a sealing groove; 3. a transfer tube; 4. an inflation tube; 5. opening and closing the valve; 6. an air pressure detecting member; 7. and a control component.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
FIG. 1 schematically illustrates a flow diagram of one embodiment of a gas detection method for a heat exchanger. As shown in fig. 1, in the air detection method of the heat exchanger provided in the embodiment of the present application, the heat exchanger includes a plurality of independent heat exchange channels, one end of each heat exchange channel is sealed to form a sealed end, the other end of each heat exchange channel is connected to a gas tube 4, a switch valve 5 is arranged on each gas tube 4, and the air detection method mainly includes the following steps:
after the air charging is finished, acquiring the air pressure change in the plurality of heat exchange channels within a preset time, such as within 24hour or 48hour, and determining whether the air cross-over phenomenon exists between the adjacent heat exchange channels according to the air pressure change.
Further, in the step of determining whether the air cross-over phenomenon exists between the adjacent heat exchange channels according to the air pressure change, when the obtained air pressure in a certain heat exchange channel is not changed, it indicates that the air cross-over phenomenon does not exist between the heat exchange channel and the heat exchange channel adjacent to the heat exchange channel. Through detecting many heat transfer passageways simultaneously, if the atmospheric pressure of many heat transfer passageways does not change, then show that there is not the air leakage between all heat transfer passageways to promote the detection efficiency of heat exchanger gas detection.
In the step of determining whether the adjacent heat exchange channels have the gas cross phenomenon according to the air pressure change, if the obtained air pressure value in a certain unaerated heat exchange channel is increased, the gas cross phenomenon exists between the aerated heat exchange channels adjacent to the unaerated heat exchange channel. If the obtained air pressure value in the unaerated heat exchange channel N is increased, the aerated heat exchange channel adjacent to the unaerated heat exchange channel N is determined as an aerated heat exchange channel N-1 and an aerated heat exchange channel N +1, and then the unaerated heat exchange channel N and the aerated heat exchange channel N-1 and the aerated heat exchange channel N +1 have a gas mixing phenomenon.
When the air leakage phenomenon exists between the unaerated heat exchange channel N and the aerated heat exchange channels N-1 and N +1, if the air pressure value of one aerated heat exchange channel is reduced and the air pressure value of the other aerated heat exchange channel is unchanged, the air leakage phenomenon exists between the aerated heat exchange channel with the changed air pressure value and the unaerated heat exchange channel N; if the air pressure values of the two air-filled heat exchange channels are reduced, the air leakage between the three heat exchange channels is indicated. The gas leakage detection among a plurality of heat exchange channels is realized quickly, the gas leakage points of two heat exchange channels in the multi-heat exchange channel are identified quickly, and whether a leakage point exists in one heat exchange channel is identified quickly.
In order to remind the user in time, there is the phenomenon of mixing of gases between the adjacent heat transfer passageway, still including reminding the step: and when the air pressure value in the corresponding air inflation heat exchange channel acquired by the air pressure detection part 6 is lower than a preset air pressure threshold value, an alarm part is started.
Specifically, the air pressure change in the heat exchange channel is obtained through an air pressure detection component arranged in the heat exchange channel, the air pressure detection component can be a pressure sensor or an air speed sensor, and the pressure change in the heat exchange channel is obtained by obtaining a pressure value or an air speed value in the heat exchange channel. In addition, other sensors capable of detecting the air pressure change in the heat exchange channel may be included, and the details are not repeated herein.
Fig. 2 schematically shows a structural schematic diagram of a heat exchanger gas detection device according to an embodiment of the invention. As shown in fig. 2, the gas detection device of the heat exchanger provided by the embodiment of the present invention includes a casing 1, the casing 1 is cylindrical with openings at two ends, a plurality of heat exchange tubes 12 are disposed in the casing 1, end plates 11 are disposed at two ends of the casing 1 respectively, the end plates 11 fix the plurality of heat exchange tubes 12 in the casing 1, a cooling channel is formed by a cavity between the heat exchange tubes 12 and an inner wall of the casing 1, an inlet and an outlet of the cooling channel are disposed on a side wall of the casing 1 respectively, a medium to be heat exchanged is introduced into the heat exchange tubes 12, so that the medium to be heat exchanged exchanges heat with a refrigerant in the cooling channel, and by disposing the plurality of heat exchange tubes 12, heat exchange areas of the heat exchange channel and.
In order to improve the heat exchange effect of the heat exchanger, the plurality of heat exchange tubes 12 are divided into a plurality of groups, and each group of heat exchange tubes 12 forms a heat exchange channel, so that the plurality of heat exchange tubes 12 share the same heat exchange channel. As shown in fig. 3 and 4, the heat exchange tubes 12 are divided into 8 groups, and 29 heat exchange tubes 12 are included in each heat exchange channel.
In order to make the plurality of heat exchange channels independent from each other to determine the sealing performance of the heat exchange channels, as shown in fig. 5, the heat exchange device further includes a tube box 2, the inner wall of the tube box 2 is provided with a plurality of sealing holes 21, and the plurality of sealing holes 21 are respectively in one-to-one correspondence with and in sealing connection with the heat exchange channels.
The pipe box 2 is provided with a plurality of mounting holes which are uniformly distributed on the periphery of the pipe box 2, the sealing holes 21 are surrounded by the mounting holes, the end plate 11 is provided with fixing holes matched with the mounting holes, and the pipe box 2 is fixed on the end plate 11 through fasteners. The plane of the tube box 2 contacting the end plate 11 is called a sealing surface, and as shown in fig. 6 to 7, a sealing groove 22 having a shape of a multi-ring is formed on the sealing surface, the sealing groove 22 is V-shaped, and a sealing member is provided in the sealing groove 22, thereby sealing the tube box 2 and the end plate 11.
In one embodiment, the number of the sealing holes 21 is 8, the 8 sealing holes 21 are arranged side by side, and in order to facilitate the connection between the sealing holes 21 and the external inflation tube 4 channels, as shown in fig. 8, the sealing holes 21 far away from the sealing surface direction are communicated with a connecting port 211, the connecting port 211 is in a bell mouth shape, the diameter of the connecting port 211 far away from the sealing surface direction is large, the diameter of the connecting port 211 close to the sealing surface direction is small, the connecting port 211 is connected with the adapter tube 3, and the connection, the replacement and the like with the inflation tube 4 are facilitated by the arrangement of the adapter tube 3.
The seal hole 21 close to the seal surface communicates with the transfer groove 212, and the area of the transfer groove 212 is larger than the cross-sectional area of the seal hole 21, so that a step is formed between the transfer groove 212 and the seal hole 21. The heat exchange tubes 12 in each heat exchange channel are disposed inside the turnaround grooves 212 to form a plurality of independent heat exchange channels.
The arrangement mode of the heat exchange channels can be adjusted according to actual conditions, and if the heat exchange channels can be arranged according to a matrix mode, a circumferential distribution mode, a linear distribution mode and the like, the method is not particularly limited in the application.
In order to facilitate the detection of air leakage of the heat exchanger, the end part of the heat exchange channel at one end of the shell 1 is sealed to form a closed end, the other end of the heat exchange channel is connected with an inflation tube 4, the inflation tube 4 is provided with a switch valve 5, for detection, the air pressure detection device further comprises an air pressure detection part 6 used for detecting the change of air pressure in the heat exchange channel, the air pressure detection part 6 is electrically connected with a control part 7, during air detection, the switch valve 5 of the heat exchange channel is opened at intervals, quantitative air is flushed, and after air inflation is finished, the air pressure change in each heat exchange channel is detected through the air pressure detection part 6 within a certain time, such as within 24 hours, so as to determine whether the air leakage phenomenon exists in the heat exchange channel.
For the judgment of the gas cross-over phenomenon, in a certain time, when the air pressure obtained by the air pressure detection part 6 in each heat exchange channel is not changed, the phenomenon that the gas cross-over phenomenon does not exist between the inflated heat exchange channel and the adjacent heat exchange channel is shown.
If the obtained air pressure value in a certain uninflated heat exchange channel N is increased, the air inflation heat exchange channels adjacent to the air inflation heat exchange channel N are determined as an air inflation heat exchange channel N-1 and an air inflation heat exchange channel N +1, and whether the air mixing phenomenon exists in the three heat exchange channels is judged according to the air pressure values in the air inflation heat exchange channel N-1 and the air inflation heat exchange channel N + 1; if the air pressure value of one of the air-filled heat exchange channels is reduced and the air pressure value of the other air-filled heat exchange channel is unchanged, indicating that air mixing exists between the air-filled heat exchange channel with the changed air pressure value and the non-air-filled heat exchange channel N; if the air pressure values of the two air-filled heat exchange channels are reduced, the air leakage between the three heat exchange channels is indicated. Through above-mentioned gas detection process, can fix a position the gas position of cluster fast, solve the gas problem of cluster, the gas test between each heat transfer passageway can once only go on, promotes the gas test efficiency of cluster by a wide margin, realizes that multiloop detects simultaneously, and the gas detection device is adaptable in the heat exchanger of different quantity heat transfer passageways, and the range of application is wide, easy operation, gas detection efficiency height.
The air pressure detection part 6 can be a pressure sensor, and the air inlet end and the air outlet end of the heat exchange channel are respectively provided with the pressure sensor for controlling the pressure value of each heat exchange channel, detecting the air pressure value in the heat exchange channel through the pressure sensor and judging whether the heat exchange channel is connected with air or not.
Besides, the air pressure detecting means 6 may be a wind speed sensor. When the heat exchange channels are inflated, gas is introduced to generate airflow, so that wind is formed in the heat exchange channels, after the inflation is finished and maintained for a period of time, if no gas cross exists in each heat exchange channel, no airflow exists in the heat exchange channels, and the reading of the wind speed sensor is 0; if air leakage exists between the heat exchange channels, the indication number of the air speed sensor is larger than 0, the air speed sensor detects the air speed inside the heat exchange channels, and meanwhile the tightness of each heat exchange channel can be conveniently judged.
In order to remind a user that a loop has air leakage in time, the air detection device further comprises an alarm part, the alarm part is electrically connected with the control part 7, and when the air pressure value acquired by the air pressure detection part 6 in the air inflation heat exchange channel is smaller than the air pressure threshold value, the alarm part is started.
Meanwhile, the gas detection device can also be used for carrying out pressure tests, after the gas leakage test is qualified, the switch valves 5 are opened, the pressure of the heat exchange channel is relieved, after the pressure relief is completed, the switch valves 5 are opened, and the heat exchange channel is inflated according to a preset boosting curve, so that the effectiveness and the safety of the pressure tests can be ensured, and the quality problem that the air conditioning system leaks due to the fact that a certain heat exchange channel is omitted and the air pressure test is not carried out is avoided.
This heat exchanger gas detection device can fix a position the gas position fast, solves the gas problem of crossing, and the gas detection of crossing between each heat transfer passageway can once only go on, promotes the gas detection efficiency of crossing by a wide margin, realizes that multiloop detects simultaneously, and the gas detection device is adaptable in the heat exchanger of different quantity heat transfer passageways, and the range of application is wide, easy operation, gas detection efficiency height.
Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. An air detection method of a heat exchanger, which is characterized in that the heat exchanger comprises a plurality of independent heat exchange channels, and the air detection method comprises the following steps:
opening the heat exchange channels at intervals, and flushing quantitative gas;
after the air inflation is finished, acquiring the air pressure change in the plurality of heat exchange channels within a preset time, and determining whether the air cross phenomenon exists between the adjacent heat exchange channels according to the air pressure change.
2. The gas detection method according to claim 1, wherein in the step of determining whether or not a cross-gas phenomenon exists between adjacent heat exchange channels according to the change in the gas pressure, when the obtained gas pressure in a certain heat exchange channel is not changed, the cross-gas phenomenon does not exist between the heat exchange channel and the heat exchange channel adjacent to the heat exchange channel.
3. The gas detection method according to claim 1, wherein in the step of determining whether a gas cross-flow phenomenon exists between adjacent heat exchange channels according to the gas pressure change, if it is obtained that the gas pressure value in a certain non-inflated heat exchange channel is increased, a gas cross-flow phenomenon exists between inflated heat exchange channels adjacent to the non-inflated heat exchange channel.
4. A gas detection method according to claim 3, wherein if the gas pressure value of one of the gas-filled heat exchange channels is reduced and the gas pressure value of the other gas-filled heat exchange channel is unchanged, gas cross-flow exists between the gas-filled heat exchange channel with the reduced gas pressure value and the non-gas-filled heat exchange channel; if the air pressure values of the two air-filled heat exchange channels are reduced, air leakage exists between the three heat exchange channels.
5. An air-detection method according to claim 1, further comprising the step of alerting: and when the obtained air pressure value in the air inflation heat exchange channel is lower than a preset air pressure threshold value, starting an alarm component.
6. A method according to claim 1, wherein the change in pressure in the heat exchange channel is obtained by a pressure detection means provided in the heat exchange channel.
7. The utility model provides a heat exchanger gas detection device, its characterized in that, the heat exchanger includes many independent heat transfer passageways, and heat transfer passageway one end is sealed, and the gas detection device includes the gas tube, and the gas tube is connected with heat transfer passageway, still includes the atmospheric pressure detection part that is used for detecting the interior atmospheric pressure change of heat transfer passageway.
8. The gas detection device of the heat exchanger as claimed in claim 7, wherein end plates are respectively arranged at two ends of the heat exchanger, the end plates are connected with the tube box in a sealing mode, the inner wall of the tube box is provided with a plurality of sealing holes, and the sealing holes are respectively in one-to-one correspondence with and are connected with the heat exchange channels in a sealing mode.
9. The gas detection device for the heat exchanger according to claim 8, wherein the sealing hole far away from the shell is communicated with a gas filling pipe, and the gas filling pipe is provided with a switch valve.
10. The heat exchanger gas detection device according to claim 7, wherein the air pressure detection component is a pressure sensor or a wind speed sensor, and the air pressure detection component is electrically connected with the control component.
11. The heat exchanger gas detection device according to claim 7, further comprising an alarm component, wherein the alarm component is electrically connected with the control component.
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| CN202110534504.1A CN113295353A (en) | 2021-05-17 | 2021-05-17 | Gas detection method and gas detection device of heat exchanger |
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Cited By (1)
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