Pipeline circulation heat supply anti-freezing test device and method

Abstract

The invention provides a pipeline circulation heat supply anti-freezing test device and method, and the device comprises a test box, a pipeline system, a medium supply system and a measurement system, and the test box is arranged on the ground; the pipeline system comprises a first pipeline system and a second pipeline system, the first pipeline system is arranged in the test box, the second pipeline system is arranged outside the test box and is communicated with the first pipeline system, and the outer side of the pipeline system is wrapped with a thermal insulation layer; the medium supply system is arranged on the second pipeline system; and the measuring system is used for measuring the temperature of the fluid medium in the pipeline system so as to verify the accuracy of the calculated temperature of the fluid medium in the pipeline system, which is theoretically calculated.

Description

Technical Field

[0001] The present application belongs to the technical field of pipeline antifreeze testing, and specifically relates to a pipeline circulation heating antifreeze testing device and method. Background Art

[0002] Tunnel pipelines, subway pipelines, and heating pipelines are basically built outdoors, and the temperature of the fluid in the pipeline will be affected by the outdoor temperature and environment. Usually, an insulation layer is set on the outside of the pipeline to reduce the energy loss of the fluid in the pipeline. However, the current related equipment cannot evaluate the impact of outdoor temperature and environment on the temperature of the fluid in the pipeline. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present application is to provide a pipeline circulation heating antifreeze test device and method, which can evaluate the influence of outdoor temperature and environment on the fluid in the pipeline, and provide a theoretical basis for actual engineering research, design and construction.

[0004] In order to solve the above problems, the first aspect of the present application provides a pipeline circulation heating antifreeze test device, comprising:

[0005] A test box, wherein the test box is arranged on the ground;

[0006] A pipeline system, the pipeline system includes a first pipeline system and a second pipeline system, the first pipeline system is arranged in the test box, and the second pipeline system is arranged outside the test box and communicated with the first pipeline system;

[0007] The outer side of the pipeline system is wrapped with a thermal insulation layer;

[0008] a medium supply system, the medium supply system being arranged on the second pipeline system and being used for supplying a circulating fluid medium into the pipeline system;

[0009] A measuring system is used to measure the temperature of the fluid medium in the pipeline system.

[0010] Optionally, the first pipeline system includes a connecting pipeline and a spiral pipeline, the spiral pipeline includes a first interface and a second interface, both ends of the connecting pipeline are respectively connected to the first interface corresponding to the spiral pipeline, and the second interface of the spiral pipeline passes through the test box.

[0011] Optionally, a drain port is provided in the middle portion of the connecting pipe, and the drain port is connected to a drain hose to drain the fluid medium in the pipe system.

[0012] Optionally, the test box further includes a steel bracket, which is disposed in the test box and fixedly mounted to the test box, and is used to support the pipeline system.

[0013] Optionally, the steel support includes a first steel support, a second steel support and a third steel support, and the test box includes a box door. The first steel support is arranged in the test box and close to the box door, and is used to support the connecting pipe and one end of the spiral pipe; the third steel support is arranged in the test box and away from the box door, and is used to support the other end of the spiral pipe; the second steel support is arranged in the test box and between the first steel support and the second steel support, and is used to support the middle part of the spiral pipe.

[0014] Optionally, the second pipeline system also includes an equipment installation pipeline, the equipment installation pipeline includes a first end and a second end, the medium supply system includes a circulation pump, a heater and a pressure-stabilizing pump, the circulation pump and the heater are respectively installed on the equipment installation pipeline, the first end of the equipment installation pipeline is connected to one end of the pressure-stabilizing pump, and the other end of the pressure-stabilizing pump is connected to a water tank so that the fluid medium can pass into the pipeline system.

[0015] Optionally, the second pipeline system further includes a parallel pipeline, both ends of which are connected to the equipment installation pipeline and are arranged in parallel with the circulation pump.

[0016] Optionally, the measurement system includes a first temperature measuring component and a second temperature measuring component, the first temperature measuring component is used to monitor the atmospheric temperature inside and outside the test box, and the second temperature measuring component is used to monitor the temperature of the fluid medium in the pipeline system.

[0017] Optionally, the measurement system further includes a pressure measuring component and a flow rate measuring component, and the pressure measuring component and the flow rate measuring component are arranged on the equipment installation pipeline.

[0018] On the other hand, the present application provides a pipeline circulation heating antifreeze test method, which uses any one of the pipeline circulation heating antifreeze test devices described above to perform an antifreeze test, and the test method includes:

[0019] Starting the test box to make the temperature inside the test box reach the set ambient temperature;

[0020] Filling the pipeline system with fluid medium and setting initial values ​​of test parameters; then heating the fluid medium to a set temperature value;

[0021] Among them, the test parameters include ambient temperature, pressure, insulation thickness and flow rate;

[0022] Cyclic test measurement: the fluid medium circulates continuously in the pipeline system, and when the temperature of the fluid medium at the outlet is in a stable state, the temperature of the fluid medium in the pipeline system in the test box is measured;

[0023] Change one of the test parameters and return to the cyclic test measurement step to obtain the measured value of the fluid medium temperature in the pipeline system under different ambient temperatures, insulation layer thicknesses, pressures and flow rates, and compare the measured value with the theoretically calculated value of the fluid medium temperature in the pipeline system to verify the accuracy of the calculated value of the fluid medium temperature in the pipeline system.

[0024] Beneficial Effects

[0025] The present application provides a pipeline circulation heating antifreeze test device and method, which supplies fluid medium into a pipeline system through a medium supply system and sets initial experimental parameters; then heats the fluid medium in the pipeline system to a set temperature; when the outlet temperature is in a stable state, measures the fluid medium temperature during the circulation of the fluid medium in the pipeline system, and compares it with a theoretically calculated value of the fluid medium temperature in the pipeline system to verify the accuracy of the calculated value of the fluid medium temperature in the pipeline system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a pipeline circulation heating antifreeze test device according to an embodiment of the present application;

[0027] Figure 2 It is a schematic diagram of the bottom part of the pipeline circulation heating antifreeze test device according to an embodiment of the present application;

[0028] Figure 3 It is a schematic diagram of the middle layer portion of the pipeline circulation heating antifreeze test device according to an embodiment of the present application;

[0029] Figure 4 It is a schematic diagram of the top layer of the pipeline circulation heating antifreeze test device according to an embodiment of the present application;

[0030] Figure 5 A cross-sectional view of a pipeline circulation heating antifreeze test device according to an embodiment of the present application;

[0031] Figure 6 This is a vertical view of the pipelines and equipment outside the box of the pipeline circulation heating antifreeze test device of the embodiment of the present application;

[0032] Figure 7 This is a schematic diagram of the first steel support in the pipeline circulation heating antifreeze test device of the embodiment of the present application, wherein Figure 7 a is the main view, Figure 7 b is a side view;

[0033] Figure 8 This is a schematic diagram of the first steel support in the pipeline circulation heating antifreeze test device of the embodiment of the present application, wherein Figure 8 a is the main view, Figure 8 b is a side view;

[0034] Fig. 9 This is a schematic diagram of the first steel support in the pipeline circulation heating antifreeze test device of the embodiment of the present application, wherein Fig. 9 a is the main view, Fig. 9 b is a side view;

[0035] Fig.10 This is a test operating condition diagram of the pipeline system of an embodiment of the present application.

[0036] The reference numerals are as follows:

[0037] 1. Test chamber; 101. Chamber door;

[0038] 201, connecting pipe; 202, spiral pipe; 20201, bottom outer pipe; 20202, bottom inner pipe; 20203, bottom connecting pipe; 20204, middle layer outer pipe; 20205, middle layer inner pipe; 20206, middle layer first connecting pipe; 20207, middle layer second connecting pipe; 20208, top layer outer pipe; 20209, top layer inner pipe; 20210, top layer first connecting pipe; 20211, top layer second connecting pipe;

[0039] 301, first steel bracket; 30101, first connecting base; 30102, first column steel pipe; 30103, first supporting steel plate; 302, second steel bracket; 30201, second connecting base; 30202, second column steel pipe; 30203, second supporting steel plate; 303, third steel bracket; 30301, third connecting base; 30302, third column steel pipe; 30303, third supporting steel plate;

[0040] 401, circulation pump; 402, heater; 403, pressure-stabilizing pump; 404, parallel pipeline; 40501, first medium supply connecting pipe; 40601, second medium supply connecting pipe; 40701, third medium supply connecting pipe; 40801, fourth medium supply connecting pipe; 40901, fifth medium supply connecting pipe; 40502, sixth medium supply connecting pipe; 40602, seventh medium supply connecting pipe; 40702, eighth medium supply connecting pipe; 40802, ninth medium supply connecting pipe; 40902, tenth medium supply connecting pipe;

[0041] 501, first temperature measuring component; 502, second temperature measuring component; 503, pressure measuring component; 504, flow rate measuring component;

[0042] 6. Steel beams;

[0043] 701, first water tank; 702, second water tank;

[0044] 801, first valve body; 802, second valve body; 803, third valve body;. DETAILED DESCRIPTION

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0049] See also Figures 1 to 9 As shown, according to a first aspect of an embodiment of the present application, a pipeline circulation heating antifreeze test device is provided, comprising:

[0050] A test box 1, the test box 1 is arranged on the ground;

[0051] A pipeline system, the pipeline system includes a first pipeline system and a second pipeline system, the first pipeline system is arranged in the test box 1, and the second pipeline system is arranged outside the test box 1 and communicated with the first pipeline system;

[0052] The outside of the piping system is wrapped with insulation;

[0053] A medium supply system, the medium supply system is arranged on the second pipeline system, and the medium supply system is used to supply a circulating fluid medium into the pipeline system;

[0054] The measuring system is used to measure the temperature of the fluid medium in the pipeline system.

[0055] The fluid medium is supplied to the pipeline system through the medium supply system, and the initial experimental parameters are set; then the fluid medium in the pipeline system is heated to the set temperature; when the outlet temperature is in a stable state, the fluid medium temperature during the circulation of the fluid medium in the pipeline system is measured and compared with the theoretically calculated value of the fluid medium temperature in the pipeline system to verify the accuracy of the calculated value of the fluid medium temperature in the pipeline system.

[0056] Among them, the first pipeline system includes a first port and a second port, and the first port and the second port pass through the test box 1; the second pipeline system includes a third port and a fourth port, and the third port of the second pipeline system is connected to the first port of the first pipeline system, and the fourth port of the second pipeline system is connected to the second port of the first pipeline system.

[0057] The test box 1 includes a box body and a box door 101. An opening is provided on the side wall of the box body, and the box door 101 is provided at the opening. The pipeline system and the measurement system are installed and maintained through the box door 101.

[0058] The first pipeline system includes a connecting pipeline 201 and a spiral pipeline 202. The spiral pipeline 202 includes a first interface and a second interface. Both ends of the connecting pipeline 201 are respectively connected to the first interfaces of the corresponding spiral pipeline 202. The second interface of the spiral pipeline 202 passes through the test box 1.

[0059] Among them, there are two spiral pipes 202, divided into a first spiral pipe and a second spiral pipe, and the two ends of the connecting pipe 201 are respectively connected to the first interface of the first spiral pipe and the first interface of the second spiral pipe, and the second interface of the first spiral pipe and the second interface of the second spiral pipe pass through the test box 1.

[0060] Specifically, the spiral pipe 202 includes a bottom layer, a middle layer and a top layer; the bottom layer is located at the bottom of the test box 1, and the bottom layer is connected to the middle layer and the top layer in sequence. The middle layer is at least one group.

[0061] The bottom layer includes a bottom outer tube 20201, a bottom inner tube 20202, and a bottom connecting tube 20203; one end of the two bottom outer tubes 20201 are respectively connected to the two ends of the connecting pipe 201, the other ends of the two bottom outer tubes 20201 are respectively connected to one end of the corresponding bottom connecting tube 20203, and one end of the bottom inner tube 20202 is connected to the other end of the corresponding bottom connecting tube 20203 to form the bottom layer.

[0062] The middle layer portion includes a middle layer outer tube 20204, a middle layer inner tube 20205, a middle layer first connecting tube 20206 and a middle layer second connecting tube 20207. One end of the two middle layer first connecting tubes 20206 is connected to the other end of the corresponding bottom inner tube 20202, the other ends of the two middle layer first connecting tubes 20206 are connected to one end of the corresponding middle layer outer tube 20204, the other ends of the two middle layer outer tubes 20204 are respectively connected to one end of the corresponding middle layer second connecting tubes 20207, and the other ends of the two middle layer second connecting tubes 20207 are respectively connected to one end of the corresponding middle layer inner tube 20205, to form the middle layer portion.

[0063] The top layer portion includes a top layer outer tube 20208, a top layer inner tube 20209, a top layer first connecting tube 20210, a top layer second connecting tube 20211, a first vertical tube 20212, and a second vertical tube. The other end of the middle layer inner tube 20205 located at the top is connected to one end of the corresponding top layer first connecting tube 20210, the other end of the top layer first connecting tube 20210 is connected to one end of the top layer outer tube 20208, and the other end of the top layer outer tube 20208 is connected to one end of the corresponding top layer second connecting tube 20211. The other end of the top-layer second connecting tube 20211 is connected to one end of the top-layer inner tube 20209, the other end of one of the top-layer inner tubes 20209 is bent toward the middle and connected to one end of the first vertical tube 20212, the other end of the other top-layer inner tube 20209 is bent toward the middle and connected to one end of the second vertical tube, and a circular hole for the first vertical tube 20212 and the second vertical tube to pass through is opened on the top plate of the test box 1, and the other ends of the first vertical tube 20212 and the second vertical tube pass through the circular hole on the top plate of the test box 1.

[0064] Specifically, the first vertical tube 20212 and the second vertical tube are sealed with the circular holes on the top plate of the test box 1 using thermal insulation cotton.

[0065] The outer circumferences of the connecting pipe 201 and the spiral pipe 202 are both covered with a thermal insulation layer; specifically, in this embodiment, the thermal insulation layer is a thermal insulation shell pipe.

[0066] A drain port is provided in the middle portion of the connecting pipe 201, and the drain port is connected to a drain hose to drain the fluid medium in the pipe system.

[0067] Among them, a drain outlet is set in the middle part of the connecting pipe 201, that is, a tee is set in the middle part of the connecting pipe 201, the tee includes a drain outlet, and the drain outlet is connected with a reducer and a hose connector in sequence, which is connected to the drain hose through the hose connector to drain the fluid medium in the pipeline system.

[0068] The drain port is provided with a fifth valve body 805. When drainage is not required, the fifth valve body 805 is in a closed state to prevent the fluid medium in the pipeline system from flowing out of the drain port.

[0069] The test box 1 also includes a steel bracket, which is arranged in the test box 1 and fixedly installed with the test box 1, and is used to support the pipeline system. The arrangement of the steel bracket prevents the pipeline system from vibrating due to the flow of the fluid medium when the fluid medium is introduced into the pipeline system and circulates.

[0070] Among them, a pedestal is arranged at a corresponding position on the bottom plate of the test box 1, and the steel bracket is installed on the corresponding pedestal inside the test box 1 by bolts.

[0071] Specifically, in this embodiment, the number of steel brackets is 6.

[0072] The steel bracket includes a first steel bracket 301, a second steel bracket 302 and a third steel bracket 303. The test box 1 includes a box door 101. The first steel bracket 301 is arranged in the test box 1 and close to the side of the box door 101, and is used to support the connecting pipe 201 and one end of the spiral pipe 202; the third steel bracket 303 is arranged in the test box 1 and away from the side of the box door 101, and is used to support the other end of the spiral pipe 202; the second steel bracket 302 is arranged in the test box 1 and is located between the first steel bracket 301 and the second steel bracket 303, and is used to support the middle part of the spiral pipe 202.

[0073] There are two first steel supports 301 , which are located on a pedestal close to the door 101 and are used to support the connecting pipe 201 and the middle layer first connecting pipe 20206 and the top layer first connecting pipe 20210 in the spiral pipe 202 .

[0074] Specifically, the first steel bracket 301 includes a first connecting base 30101, a first column steel pipe 30102 and a first supporting steel plate 30103. The first connecting base 30101 is installed on a pedestal near the door 101 in the test box 1 by bolts. The first column steel pipe 30102 is arranged on the first connecting base 30101, and the first supporting steel plates 30103 are arranged at equal intervals on the first column steel pipe 30102. A gap is set between the connecting pipe 201, the middle layer first connecting pipe 20206 and the top layer first connecting pipe 20210 and the corresponding first supporting steel plate 30103, and a hard foam board is filled in the gap.

[0075] Among them, there are two second steel supports 302, which are located on a pedestal in the middle part of the inner cavity of the test box 1. The two second steel supports 302 share a pedestal. The second steel supports 302 are used to support the bottom outer tube 20201, the bottom inner tube 20202, the middle outer tube 20204, the middle inner tube 20205, the top outer tube 20208 and the top inner tube 20209.

[0076] Specifically, the second steel bracket 302 includes a second connecting base 30201, a second column steel pipe 30202 and a second supporting steel plate 30203. The second connecting base 30201 is installed on a pedestal in the middle part of the test box 1 by bolts. The second connecting base 30201 is provided with a second column steel pipe 30202. The second column steel pipe 30202 is provided with a plurality of second supporting steel plates 30203 arranged along the axial direction of the second column steel pipe 30202. A gap is provided between the bottom outer tube 20201, the bottom inner tube 20202, the middle layer outer tube 20204, the middle layer inner tube 20205, the top outer tube 20208 and the top inner tube 20209 and the corresponding second supporting steel plates 30203, and a hard foam board is filled in the gap.

[0077] More specifically, the second supporting steel plates 30203 are arranged on the left and right sides of the second column steel tube 30202, and a spacing distance is set between two adjacent second supporting steel plates 30203 arranged on the left and right sides.

[0078] There are two third steel brackets 303 , which are located on a pedestal on the inner cavity of the test box 1 away from the box door, and are used to support the bottom layer connecting pipe 20203 , the middle layer second connecting pipe 20207 , and the top layer second connecting pipe 20211 .

[0079] Specifically, the third steel bracket 303 includes a third connecting base 30301, a third column steel pipe 30302 and a third supporting steel plate 30303. The third connecting base 30301 is installed on a pedestal in the test box 1 away from the box door 101 by bolts. The third connecting base 30301 is provided with a third column steel pipe 30302. The third column steel pipe 30302 is provided with a plurality of third supporting steel plates 30303 arranged along the axis direction of the third column steel pipe 30302. A gap is provided between the bottom connecting pipe 20203, the middle layer second connecting pipe 20207, the top layer second connecting pipe 20211 and the third supporting steel plate 30303, and a hard foam board is filled in the gap.

[0080] More specifically, the first support steel plate 30103 and the second support steel plate 30201 arranged in the same direction of the first steel support 301 and the second steel support 302 have different heights, and the second support steel plate 30201 and the third support steel plate 30303 arranged in the same direction of the second steel support 302 and the third steel support 303 have different heights, so that the pipeline system can be arranged in a spiral shape.

[0081] The second pipeline system also includes an equipment installation pipeline, which includes a first end. The medium supply system includes a circulation pump 401, a heater 402 and a pressure-stabilizing pump 403. The circulation pump 401 and the heater 402 are respectively installed on the equipment installation pipeline. The first end of the equipment installation pipeline is connected to one end of the pressure-stabilizing pump 403, and the other end of the pressure-stabilizing pump 403 is connected to the water tank to allow the fluid medium to pass into the pipeline system.

[0082] The circulating pump 401 is used to realize the circulation of the fluid medium in the pipeline system, and the heater 402 is used to heat the fluid medium; the outside of the heater is wrapped with rubber and plastic foam for thermal insulation to reduce heat loss.

[0083] There may be one or two water tanks. In the present embodiment, two water tanks are provided for the convenience of arranging the second pipeline system, namely a first water tank 701 and a second water tank 702 .

[0084] The equipment installation pipeline also includes a second end, which is connected to the inlet of the pipeline tee. The first outlet of the pipeline tee is connected to the water outlet pipeline, and the water outlet pipeline is connected to the second water tank 702.

[0085] Specifically, a fifth valve 805 is provided on the water outlet pipe.

[0086] Among them, the second pipeline system also includes a first medium supply pipe group and a second medium supply pipe group, the third port of the first medium supply pipe group is connected to the first port of the first pipeline system, the fourth port of the second medium supply pipe group is connected to the second port of the second medium supply pipe group, the first end of the equipment installation pipeline is connected to the second medium supply pipe group, and the second outlet of the pipeline tee at the second end of the equipment installation pipeline is connected to the first medium supply pipe group.

[0087] More specifically, both the first medium supply pipe group and the second medium supply pipe group are covered with a thermal insulation layer, and in this embodiment, the thermal insulation layer is a thermal insulation shell tube.

[0088] Specifically, the first medium supply pipe group includes a first medium supply connecting pipe 40501, a second medium supply connecting pipe 40601, a third medium supply connecting pipe 40701, a fourth medium supply connecting pipe 40801 and a fifth medium supply connecting pipe 40901; one end of the first medium supply connecting pipe 40501 is connected to the first vertical pipe 20201 of the spiral pipe, the other end of the first medium supply connecting pipe 40501 is respectively connected to one end of the second medium supply connecting pipe 40601 and one end of the third medium supply connecting pipe 40701, the other end of the third medium supply connecting pipe 40701 is connected to one end of the fourth medium supply connecting pipe 40801, the other end of the fourth medium supply connecting pipe 40801 is connected to one end of the fifth medium supply connecting pipe 40901, the other end of the fifth medium supply connecting pipe 40901 is connected to the second water tank 702 through a hose, and the other end of the second medium supply connecting pipe 40601 is connected to the second outlet of the pipe tee at the second end of the equipment installation pipe.

[0089] The second medium supply pipe group includes a sixth medium supply connecting pipe 40502, a seventh medium supply connecting pipe 40602, an eighth medium supply connecting pipe 40702, a ninth medium supply connecting pipe 40802 and a tenth medium supply connecting pipe 40902; one end of the sixth medium supply connecting pipe 40501 is connected to the second vertical pipe of the spiral pipe, the other end of the sixth medium supply connecting pipe 40502 is respectively connected to one end of the seventh medium supply connecting pipe 40602 and one end of the eighth medium supply connecting pipe 40702, the other end of the eighth medium supply connecting pipe 40702 is connected to one end of the ninth medium supply connecting pipe 40802, the other end of the ninth medium supply connecting pipe 40802 is connected to one end of the tenth medium supply connecting pipe 40902, the other end of the tenth medium supply connecting pipe 40902 is connected to the first water tank 701 through a hose, and the other end of the seventh medium supply connecting pipe 40602 is connected to the first end of the equipment installation pipeline.

[0090] Specifically, the test device further includes a steel beam 6 , which is arranged higher than the test box 1 , and is used to support the first medium supply connecting pipe 40501 and the sixth medium supply connecting pipe 40502 .

[0091] There is a gap between the first medium supply connecting pipe 40501 and the sixth medium supply connecting pipe 40502 and the upper surface of the steel beam 6, and a hard foam board is filled in the gap to support the first medium supply connecting pipe 40501 and the sixth medium supply connecting pipe 40502 to improve the stability of the second pipeline system.

[0092] More specifically, in this embodiment, the spacing distance between the external connecting pipe 7 and the steel beam 6 is 60 mm.

[0093] Specifically, calorimeters are respectively provided on the first connecting pipe 40501 for supporting medium supply and the sixth connecting pipe 40502 for supporting medium supply.

[0094] Specifically, the second medium supply connecting pipe 40601 is provided with a second valve 802 , the seventh medium supply connecting pipe 40602 is provided with a first valve 801 , the eighth medium supply connecting pipe 40501 is provided with a seventh valve 807 , and the third medium supply connecting pipe 40502 is provided with a sixth valve 806 .

[0095] Among them, the first end of the equipment installation pipeline is connected to one end of the pressure-stabilizing pump 403, and the other end of the pressure-stabilizing pump 403 is connected to the water tank, so that the fluid medium can pass into the pipeline system. That is to say, the two ends of the pressure-stabilizing pump 403 are respectively connected to the first pressure-stabilizing pipeline and the second pressure-stabilizing pipeline. One end of the pressure-stabilizing pump 403 is installed on the first end of the equipment installation pipeline through the first pressure-stabilizing pipeline, and the other end of the pressure-stabilizing pump 403 is connected to the first water tank 701 through the second pressure-stabilizing pipeline. The second pressure-stabilizing pipeline extends to the inner end of the first water tank 701 and is provided with a bottom valve 807.

[0096] The second pipeline system further includes a parallel pipeline 404 , both ends of which are in communication with the equipment installation pipeline and are arranged in parallel with the circulation pump 401 .

[0097] Wherein, a fourth valve body 804 is disposed on the parallel pipeline 404 .

[0098] The measuring system comprises a first temperature measuring element 501 and a second temperature measuring element 502 . The first temperature measuring element 501 is used to monitor the atmospheric temperature inside and outside the test box 1 , and the second temperature measuring element 502 is used to monitor the temperature of the fluid medium.

[0099] There are 14 first temperature measuring components 501 , 12 of which are located inside the test box 1 , and 2 are located outside the test box 1 .

[0100] Specifically, two first temperature measuring components 501 are arranged along the axial direction at each steel support, and two first temperature measuring components 501 are arranged in the height direction outside the test box 1 .

[0101] There are ten second temperature measuring components 502 , eight of which are located inside the test box 1 , and two are located outside the test box 1 .

[0102] Specifically, a second temperature measuring component 502 is arranged on each of the two bottom inner tubes 20202 of the bottom layer; a second temperature measuring component 502 is arranged on each of the two middle layer outer tubes 20204 of the middle layer; two second temperature measuring components 502 are respectively provided on the first vertical tube 20212 and the second vertical tube; a second temperature measuring component 502 is respectively arranged on the second medium supply connecting tube 40601 and the seventh medium supply connecting tube 40602.

[0103] More specifically, through holes with a diameter of 10 mm are drilled on the bottom inner tube 20202, the middle outer tube 20204, the first vertical tube 20212, the second vertical tube, the second medium supply connecting tube 40601 and the seventh medium supply connecting tube 40602, respectively, and M8 nuts are welded concentrically at the through holes. The threaded second temperature measuring component 502 is screwed onto the nuts and fixed, and the sealing between the second temperature measuring component 502 and the nut is ensured by using raw tape or other means.

[0104] The measuring system further comprises a pressure measuring component 503 and a flow rate measuring component 504, and the pressure measuring component 503 and the flow rate measuring component 504 are arranged on the equipment installation pipeline.

[0105] Among them, the pressure measuring piece 503 includes a first pressure measuring piece and a second pressure measuring piece, and the first pressure measuring piece and the second pressure measuring piece are respectively installed on the equipment installation pipeline near the first end and the second end; a flow rate measuring piece 504 is arranged on the equipment installation pipeline between the first pressure measuring piece and the circulation pump 401.

[0106] A second aspect of the present embodiment provides a pipeline circulation heating antifreeze test method, using any one of the above pipeline circulation heating antifreeze test devices, including the following steps:

[0107] Step S1, start the test box 1, and make the temperature inside the test box 1 reach the set ambient temperature.

[0108] Specific:

[0109] Step S11, initialization confirmation of the test device before the test;

[0110] Specifically, ensure that there is no fluid medium in the pipeline system and the medium supply system; the ambient temperature in the test box 1 is at room temperature; the first valve body 801, the second valve body 802, the third valve body 803, the fourth valve body 804, the fifth valve body 805, the sixth valve body 806 and the seventh valve 807 are closed; the first water tank 701 and the second water tank 702 are filled with at least 400 kg of fluid medium;

[0111] Step S12, start the measurement system to ensure that the measurement system works normally;

[0112] Specifically, turn on the first temperature measuring element 501, the second temperature measuring element 502, the first pressure measuring element, the second pressure measuring element and the flow rate measuring element 504, the electric energy meter connected to the circulation pump 401 and the electric energy meter connected to the heater 402, and ensure that the test status is good;

[0113] Step S13, start the test box 1 to perform refrigeration work, so that the temperature in the test box 1 reaches the set ambient temperature; use the first temperature measuring element 501 in the test box 1 to monitor the uniformity and stability of the ambient temperature inside the test box 1;

[0114] Step S2, the medium supply system is used to fill the pipeline system with fluid medium and set the initial value of the test parameter; then the fluid medium is heated to the set temperature value.

[0115] Among them, the test parameters include ambient temperature, pressure, insulation thickness and flow rate;

[0116] Specifically:

[0117] Step S21, open the first valve body 801, the second valve body 802, the third valve body 803, the fourth valve body 804, the sixth valve body 806 and the seventh valve 807; turn on the pressure-stabilizing pump 403 and the circulation pump 401, and the pressure-stabilizing pump 403 pumps the fluid medium from the first water tank 701 into the pipeline system until no bubbles flow out of the hose part at the sixth valve body 806 and the seventh valve body 807, that is, the fluid medium flows out stably at the hose outlet, and at this time the pipeline system is filled with the fluid medium;

[0118] Among them, the flow rate of circulating pump 401 is 0.2m 3 / h, the pressure-stabilizing pump 403 meets the water pressure of 5m head;

[0119] Step S22, closing the circulation pump 401 and the pressure-stabilizing pump 403, and closing the sixth valve body 806 and the seventh valve body 807;

[0120] Step S23, pressure setting, turning on the pressure regulating pump 403, and adjusting the pressure value of the pressure regulating pump 403 to reach the set pressure value;

[0121] Step S24, flow rate setting, turning on the circulation pump 401, adjusting the speed of the circulation pump 401, observing the flow rate measured by the flow rate measuring element 504, and making the flow rate of the fluid medium in the pipeline system reach the set flow rate value;

[0122] Similarly, the set flow rate value can also be adjusted by adjusting the opening of the second valve body 802;

[0123] Step S25, temperature control, adjusting the heating power of the heater 402 so that the temperature of the inlet fluid medium is stabilized at a set temperature control value;

[0124] The heating power can be set according to the actual calculated value, or the temperature control value can be set according to the inlet fluid medium temperature;

[0125] The set temperature control value is determined by the air temperature outside the test chamber at the time of the test, that is, the same as the air temperature outside the test chamber 1, to avoid the influence of heat exchange of the second pipeline system outside the test chamber 1, and the stability standard is implemented according to the fluctuation of no more than ±0.1℃;

[0126] The inlet fluid medium temperature refers to the fluid medium temperature at the outlet of the heater 402;

[0127] Step S3, cyclic test measurement; the fluid medium circulates continuously in the pipeline system, and when the temperature of the fluid medium at the outlet is in a stable state, the temperature of the fluid medium in the pipeline system in the test box 1 is measured.

[0128] Among them, for other cyclic test conditions, according to the specific requirements of the test, it is not necessary to measure after the temperature of the fluid medium at the outlet is in a stable state.

[0129] Specifically:

[0130] Driven by the circulation pump 401, the fluid medium in the pipeline system circulates continuously in the pipeline system, and the outlet fluid medium temperature is observed. After the outlet fluid medium temperature is stabilized, the temperature of the fluid medium at each temperature measuring point in the pipeline system in the test box 1 is measured;

[0131] Wherein, the outlet fluid medium temperature refers to the temperature of the fluid medium at the inlet of the heater;

[0132] Among them, after the outlet fluid medium temperature is stabilized, the standard of outlet fluid medium temperature stability is that the fluctuation is no more than ±0.1°C;

[0133] Step S4, change one of the test parameters and repeat step S3; to obtain the measured value of the fluid medium temperature in the pipeline system under different ambient temperatures, heat transfer coefficients of the insulation layer, pressures and flow rates, and compare it with the theoretically calculated value of the fluid medium temperature in the pipeline system to verify the accuracy of the calculated value of the fluid medium temperature in the pipeline system.

[0134] After step S4 is completed, tests of other working conditions can be performed according to the following conditions:

[0135] When the thickness of the insulation layer remains unchanged:

[0136] (1) If the time required to complete the next working condition test is available on that day, the ambient temperature, set pressure value and set flow rate value in the test chamber 1 are adjusted according to the test working conditions, and step S3 is repeated to perform the next working condition test.

[0137] (2) If the time required to complete the next working condition test is not available on the same day, the test device shall be turned off. The test shall be conducted again the next day, and steps S1 to S4 shall be repeated to conduct the test. Determine whether it is necessary to drain the fluid medium in the test device after the previous test working condition is completed based on the cooling time of the test box 1. If the test box 1 can return to normal temperature in a short time, it is not necessary to drain the fluid medium, and the water filling procedure of the test device can be omitted. The circulation pump 401 and the heater 403 can be started when the test box 1 is cooled down to avoid excessive drop in water temperature in the test device, which may affect the test. If drainage is required, the fifth valve body 805 and the eighth valve body 808 can be used to drain the fluid medium in the test device.

[0138] When the insulation thickness changes:

[0139] If the thickness of the insulation layer of the next working condition changes, the test device is turned off, the refrigeration of the test box is stopped, the insulation layer is replaced, and steps S1 to S4 are repeated to perform the test after the insulation layer is replaced.

[0140] More specific embodiments

[0141] Based on the test purpose, technical requirements and parameters to be tested of the indoor pipeline circulation test, the test conditions are determined on the basis of calculation and analysis. The test conditions take into account the influence of four factors, namely, the thickness of the insulation layer, the ambient temperature, the flow rate and the water pressure, on the temperature and power of the model system. The thickness of the insulation layer is 10mm, 20mm and 30mm; the ambient temperature is -5℃, -20℃ and -35℃; the flow rate is 0.05m / s, 0.10m / s and 0.15m / s; the water pressure is 50kPa, 100kPa and 200kPa. According to the reasonable combination of the above four factors and taking into account the rationality of the test sequence, 17 test conditions are designed, such as Fig.10 During the test, the pipeline circulation heating antifreeze test method is implemented according to Fig.10 The operating conditions are numbered in the order shown.

[0142] In the temperature control step, the heating power of the heater 402 is adjusted to stabilize the inlet fluid medium temperature at a set temperature control value of 20°C.

[0143] When the flow rate is 0.05m / s, the temperature of the fluid medium in the piping system in the test box 1 shall be measured for no less than 120min; when the flow rate is 0.10m / s, the temperature of the fluid medium in the piping system in the test box 1 shall be measured for no less than 60min; when the flow rate is 0.15m / s, the temperature of the fluid medium in the piping system in the test box 1 shall be measured for no less than 40min.

[0144] After the test device is installed, it needs to be debugged before the first test. During the debugging stage, the insulation layer of the pipe in the environmental chamber is 20mm rubber-plastic sponge. The debugging method of the test device includes:

[0145] Step S1, initialization confirmation of the test device before the test;

[0146] Specifically, ensure that there is no fluid medium in the pipeline system and the medium supply system; the ambient temperature in the test chamber 1 is at room temperature; the first valve body 801, the second valve body 802, the third valve body 803, the fourth valve body 804, the fifth valve body 805, the sixth valve body 806 and the seventh valve 807 are in the closed state; the first water tank 701 and the second water tank 702 are filled with at least 400 kg of fluid medium.

[0147] Step S2, start the measurement system to ensure that the measurement system works normally;

[0148] Specifically, turn on the first temperature measuring component 501, the second temperature measuring component 502, the first pressure measuring component, the second pressure measuring component and the flow rate measuring component 504, and the electric energy meter connected to the circulation pump 401 and the electric energy meter of the heater 402 to ensure that the test status is good.

[0149] Step S3, open the first valve body 801, the second valve body 802, the third valve body 803, the fourth valve body 804, the sixth valve body 806 and the seventh valve 807; turn on the pressure-stabilizing pump 403 and the circulation pump 401, and the pressure-stabilizing pump 403 draws fluid medium from the first water tank 701 into the pipeline system until no bubbles flow out of the hose part at the sixth valve body 806 and the seventh valve body 807, that is, the fluid medium flows out stably at the hose outlet, and at this time the inside of the pipeline system is filled with fluid medium.

[0150] Step S4, closing the circulation pump 401 and the pressure-stabilizing pump 403, and closing the first valve 801, the sixth valve body 806, and the seventh valve body 807.

[0151] Step S5, calibrating the flow meter, turning on the pressure-stabilizing pump 403, measuring the flow rate of the fluid medium at its inlet with the flow meter, slowly adjusting the opening of the second valve body 802 so that the inlet flow rate reaches the set flow rate value, using an external water bucket, receiving water through a hose connected to the sixth valve 806 for no less than 120 seconds, and turning off the pressure-stabilizing pump 403; weighing the weight of the fluid medium in the water bucket, calculating the flow rate of the fluid medium in the pipeline system, and comparing it with the flow rate value of the fluid medium measured by the flow meter to check the accuracy of the flow meter;

[0152] By adjusting the opening of the second valve body 802, three flow rate settings of 0.05 m / s, 0.10 m / s and 0.15 m / s are verified in turn.

[0153] Step S6, closing the sixth valve body 806 and opening the first valve body 801;

[0154] Step S7, pressure setting, turning on the pressure regulating pump 403, adjusting the pressure value of the pressure regulating pump 403 to reach the set pressure value; comparing the pressure value measured by the pressure measuring piece with the set pressure value to check the accuracy of the pressure measuring piece;

[0155] The three cases of set pressure values ​​of 50kPa, 100kPa and 200kPa were verified in turn.

[0156] Step S8, flow rate setting, turning on the circulation pump 401, adjusting the speed of the circulation pump 401, making the flow rate of the fluid medium in the pipeline system reach the set flow rate value, comparing the flow rate value measured by the flow rate measuring element 504 with the set flow rate value, and checking the accuracy of the flow rate measuring element;

[0157] The three flow velocity settings of 0.05m / s, 0.10m / s and 0.15m / s were verified in turn.

[0158] Similarly, the set flow rate value can also be adjusted by adjusting the opening of the second valve body 802;

[0159] Step S9, start the test box 1 to perform refrigeration work, so that the temperature in the test box 1 reaches the set ambient temperature; use the first temperature measuring element 501 in the test box 1 to monitor the uniformity and stability of the ambient temperature inside the test box 1, the temperature difference between different measuring points is not more than 2°C, and the temperature fluctuation of each point is not more than ±1°C; used to detect the performance of the test box 1;

[0160] Verification was carried out in turn for three conditions with the ambient temperature set at -5°C, -20°C and -35°C.

[0161] Step S10, temperature control, adjusting the heating power of the heater 402 so that the temperature of the inlet fluid medium is stabilized at a set temperature control value; using the first temperature measuring element 501 at the inlet and outlet of the heater 402 to measure the temperature of the fluid medium, so as to detect the performance of the heater;

[0162] The heating power can be set according to the actual calculated value, or the temperature control value can be set according to the inlet fluid medium temperature;

[0163] The set temperature control value is determined by the air temperature outside the test chamber at the time of the test, that is, the same as the air temperature outside the test chamber 1, to avoid the influence of heat exchange of the second pipeline system outside the test chamber 1, and the stability standard is implemented according to the fluctuation of no more than ±0.1℃;

[0164] Step S11, after the debugging work is completed, the test device is closed; the fluid medium in the pipeline system is drained through the fifth valve body 805 and the eighth valve body 808.

[0165] Using any of the above pipeline circulation heating antifreeze test devices, the comprehensive heat transfer coefficient of the insulation layer can also be measured, including the following steps:

[0166] Start the test chamber 1 and make the temperature inside the test chamber 1 reach the set ambient temperature;

[0167] The medium supply system is used to fill the pipeline system with fluid medium and set the initial value of the test parameter; then the fluid medium is heated to the set temperature value;

[0168] Among them, the test parameters include ambient temperature, pressure and flow rate;

[0169] Determination of comprehensive heat transfer coefficient of thermal insulation layer: Turn off the circulation pump 403, the pressure regulating pump 403 and the heater 402, make the fluid medium in the pipeline system static and stop temperature control of the fluid medium, measure the temperature of the fluid medium in the pipeline system in the test box 1, and calculate the comprehensive heat transfer coefficient of the thermal insulation layer using the temperature change curve;

[0170] Among them, the comprehensive heat transfer coefficient of the insulation layer refers to the heat transfer coefficient taking into account the quality of the insulation layer material and the installation process conditions (referring to winding aluminum foil or glass fiber cloth).

[0171] Change the thickness of the insulation layer, return to the step of starting the test chamber 1, measure the temperature of the fluid medium in the pipeline system in the test chamber 1, and calculate the comprehensive heat transfer coefficient of the insulation layers of different thicknesses using the temperature change curve.

[0172] When the thickness of the thermal insulation layer is changed, the measuring device is turned off and the refrigeration of the test box 1 is stopped.

[0173] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0174] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A pipeline circulation heating antifreeze test device, characterized in that: include: A test box (1), wherein the test box (1) is arranged on the ground; A pipeline system, the pipeline system comprising a first pipeline system and a second pipeline system, the first pipeline system being arranged in the test box (1), and the second pipeline system being arranged outside the test box (1) and communicating with the first pipeline system; The outer side of the pipeline system is wrapped with a thermal insulation layer; a medium supply system, the medium supply system being arranged on the second pipeline system and being used for supplying a circulating fluid medium into the pipeline system; A measuring system is used to measure the temperature of the fluid medium in the pipeline system.

2. A pipeline circulation heating antifreeze test device according to claim 1, characterized in that: The first pipeline system comprises a connecting pipeline (201) and a spiral pipeline (202), the spiral pipeline (202) comprises a first interface and a second interface, the two ends of the connecting pipeline (201) are respectively connected to the first interface corresponding to the spiral pipeline (202), and the second interface of the spiral pipeline (202) passes through the test box (1).

3. A pipeline circulation heating antifreeze test device according to claim 2, characterized in that: A drain port is provided in the middle portion of the connecting pipe (201), and the drain port is connected to a drain hose to drain the fluid medium in the pipe system.

4. A pipeline circulation heating antifreeze test device according to claim 2, characterized in that: The test box (1) further comprises a steel bracket, which is arranged in the test box (1) and fixedly mounted to the test box (1), and is used to support the pipeline system.

5. A pipeline circulation heating antifreeze test device according to claim 4, characterized in that: The steel support comprises a first steel support (301), a second steel support (302) and a third steel support (303); the test box (1) comprises a box door (101); the first steel support (301) is arranged in the test box (1) and close to the box door (101), and is used to support the connecting pipe (201) and one end of the spiral pipe (202); the third steel support (303) is arranged in the test box (1) and away from the box door (101), and is used to support the other end of the spiral pipe (202); the second steel support (302) is arranged in the test box (1) and between the first steel support (301) and the second steel support (303), and is used to support the middle part of the spiral pipe (202).

6. A pipeline circulation heating antifreeze test device according to claim 2, characterized in that: The second pipeline system also includes an equipment installation pipeline, the equipment installation pipeline includes a first end, the medium supply system includes a circulation pump (401), a heater (402) and a pressure-stabilizing pump (403), the circulation pump (401) and the heater (402) are respectively installed on the equipment installation pipeline, the first end of the equipment installation pipeline is connected to one end of the pressure-stabilizing pump (403), and the other end of the pressure-stabilizing pump (403) is connected to a water tank, so that the fluid medium can pass into the pipeline system.

7. A pipeline circulation heating antifreeze test device according to claim 5, characterized in that: The second pipeline system further comprises a parallel pipeline (404), both ends of which are in communication with the equipment installation pipeline and form a parallel arrangement with the circulation pump (401).

8. A pipeline circulation heating antifreeze test device according to claim 5, characterized in that: The measurement system comprises a first temperature measuring component (501) and a second temperature measuring component (502), wherein the first temperature measuring component (501) is used to monitor the atmospheric temperature inside and outside the test box (1), and the second temperature measuring component (502) is used to monitor the temperature of the fluid medium in the pipeline system.

9. A pipeline circulation heating antifreeze test device according to claim 5, characterized in that: The measuring system further comprises a pressure measuring component (503) and a flow rate measuring component (504), wherein the pressure measuring component (503) and the flow rate measuring component (504) are arranged on the equipment installation pipeline.

10. A pipeline circulation heating antifreeze test method, characterized in that: The antifreeze test is carried out using the pipeline circulation heating antifreeze test device according to any one of claims 1 to 9, and the test method comprises: Starting the test box (1) so that the temperature inside the test box (1) reaches a set ambient temperature; Filling the pipeline system with fluid medium and setting initial values ​​of test parameters; then heating the fluid medium to a set temperature value; Among them, the test parameters include ambient temperature, pressure, insulation thickness and flow rate; Cyclic test measurement: the fluid medium is continuously circulated in the pipeline system, and when the temperature of the fluid medium at the outlet is in a stable state, the temperature of the fluid medium in the pipeline system in the test box (1) is measured; Change one of the test parameters and return to the cyclic test measurement step to obtain the measured value of the fluid medium temperature in the pipeline system under different ambient temperatures, insulation layer thicknesses, pressures and flow rates, and compare the measured value with the theoretically calculated value of the fluid medium temperature in the pipeline system to verify the accuracy of the calculated value of the fluid medium temperature in the pipeline system.

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