CN214469508U - Refrigerating system for fuel system test - Google Patents
Refrigerating system for fuel system test Download PDFInfo
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- CN214469508U CN214469508U CN202120581153.5U CN202120581153U CN214469508U CN 214469508 U CN214469508 U CN 214469508U CN 202120581153 U CN202120581153 U CN 202120581153U CN 214469508 U CN214469508 U CN 214469508U
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Abstract
The utility model relates to a refrigerating system for fuel oil system is experimental, this refrigerating system includes: a cold end device having cryogenic nitrogen; a test fuel storage tank configured to store a test fuel; and the heat exchange device is used for realizing heat exchange between low-temperature nitrogen from the cold end device and test fuel from the test fuel storage tank through the heat exchange device, wherein the heat exchange device comprises a primary heat exchanger and a secondary heat exchanger, the primary heat exchanger and the secondary heat exchanger are connected through a heat exchange device pipeline, and an intermediate medium flows through the primary heat exchanger and the secondary heat exchanger through the heat exchange device pipeline, wherein the low-temperature nitrogen from the cold end device flows through the primary heat exchanger, so that the low-temperature nitrogen from the cold end device realizes heat exchange with the intermediate medium through the primary heat exchanger, and wherein the test fuel of the test fuel storage tank flows through the secondary heat exchanger, so that the intermediate medium realizes heat exchange with the test fuel from the test fuel storage tank through the secondary heat exchanger.
Description
Technical Field
The utility model relates to a refrigerating system specifically relates to a liquid nitrogen refrigerating system who is used for the multistage series connection form of fuel system test field.
Background
During high-altitude flight of an airplane, the low temperature of the external environment easily causes the fuel system to be frozen, so that pipelines of the fuel system are blocked, and further, flight accidents are caused. The airworthiness approval department provides new airworthiness terms for airworthiness approval of the fuel system, and requires that the civil aircraft must carry out a fuel system icing test to verify and explain the conformance of the fuel system to the airworthiness terms. At present, only B787 and A350 models carry out relevant tests abroad, and relevant domestic experiences are lacking.
In the current icing test of the fuel system, test fuel oil in a low-temperature fuel oil tank is supplied to the fuel system to be tested in an environment simulation bin, and the icing and blocking conditions of a fuel pipeline of the fuel system to be tested during the circulation of the low-temperature fuel oil are verified. Particularly, the cooling of the supersaturated fuel is one of the difficulties in the icing test of the fuel system, and the difficulties are that water which is not dissolved in the fuel is easy to gather and ice at low test temperature and low temperature, and the water state in the fuel and the cooling rate of the fuel need to be considered in the process of modulating the test fuel. Therefore, the design of the fuel refrigeration system has important influence on the test efficiency, the test reliability, the energy consumption and the like of the whole fuel system icing test.
In the current field of low temperature testing of fuel oil, the design of a refrigeration system can be mainly divided into compressor refrigeration (as described in CN 205203420U) and liquid nitrogen refrigeration (as described in CN 205678969U). The test fuel quantity required by the fuel system icing test is large, and the temperature is low in the extreme test, so that the defects of poor low-temperature cooling performance, high power consumption, high noise and the like in the compressor refrigeration are reflected. Compared with compressor refrigeration, the cooling capacity of using liquid nitrogen as a cold source is obviously improved. However, the existing liquid nitrogen refrigeration system directly exchanges heat between liquid nitrogen and fuel oil through a heat exchanger, the temperature control capability of the existing liquid nitrogen refrigeration system to the test fuel oil is poor, and moisture in the fuel oil is easily accumulated in the heat exchanger, so that the water content of the test fuel oil is reduced, and the test requirement is not met.
Accordingly, there remains a need for further improvements to existing refrigeration systems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a technical problem that will solve is: the utility model provides a refrigerating system, can be when improving experimental fuel cooling efficiency, possess better temperature control performance, the moisture of reduction experimental fuel gathers in order to provide the fuel that satisfies the freezing experiment of fuel system in the heat exchanger to can also reduce the consumption of liquid nitrogen in the freezing experiment of fuel system.
In order to solve the above problem, the utility model provides a refrigerating system for fuel oil system is experimental, this refrigerating system includes: a cold end device having cryogenic nitrogen; a test fuel storage tank configured to store a test fuel; and the heat exchange device is used for realizing heat exchange between low-temperature nitrogen from the cold end device and test fuel from the test fuel storage tank through the heat exchange device, wherein the heat exchange device comprises a primary heat exchanger and a secondary heat exchanger, the primary heat exchanger and the secondary heat exchanger are connected through a heat exchange device pipeline, and an intermediate medium flows through the primary heat exchanger and the secondary heat exchanger through the heat exchange device pipeline, wherein the low-temperature nitrogen from the cold end device flows through the primary heat exchanger, so that the low-temperature nitrogen from the cold end device realizes heat exchange with the intermediate medium through the primary heat exchanger, and wherein the test fuel of the test fuel storage tank flows through the secondary heat exchanger, so that the intermediate medium realizes heat exchange with the test fuel from the test fuel storage tank through the secondary heat exchanger.
According to an aspect of the utility model, heat transfer device is still including the middle medium storage tank of supplying with middle medium, and middle medium storage tank passes through heat transfer device tube coupling to one-level heat exchanger and second grade heat exchanger.
According to an aspect of the utility model, the heat transfer device pipeline is single circulation circuit, and wherein, intermediate medium storage tank, one-level heat exchanger and second grade heat exchanger pass through the heat transfer device tube coupling.
According to one aspect of the invention, the intermediate medium is a fluorinated liquid, or sixty-five antifreeze liquid.
According to an aspect of the utility model, still be equipped with heat transfer device pump and heat transfer device flow control valve in the heat transfer device pipeline, wherein, the heat transfer device pump is used for ordering about the flow of middle medium circulation in the heat transfer device pipeline to wherein, heat transfer device flow control valve is arranged in adjusting the flow of middle medium in the heat transfer device pipeline.
According to an aspect of the utility model, the cold junction device includes nitrogen gas blending tank and liquid nitrogen storage tank, and wherein, the nitrogen gas blending tank passes through nitrogen gas circulation tube coupling with the one-level heat exchanger for the low temperature nitrogen gas that comes from the nitrogen gas blending tank realizes the heat exchange through one-level heat exchanger and intermediate medium, and the circulation returns the nitrogen gas blending tank afterwards, and wherein, the liquid nitrogen storage tank provides unused liquid nitrogen to the nitrogen gas blending tank through liquid nitrogen supply line.
According to the utility model discloses an aspect still is equipped with nitrogen gas circulating fan and nitrogen gas circulation flow control valve in the nitrogen gas circulating line, and wherein, nitrogen gas circulating fan is arranged in ordering about low temperature nitrogen gas circulation flow in nitrogen gas circulating line to wherein, nitrogen gas circulation flow control valve is arranged in adjusting the flow of low temperature nitrogen gas in nitrogen gas circulating line.
According to an aspect of the utility model, the nitrogen gas circulation pipeline still is equipped with the nitrogen gas flow divider in one-level heat exchanger low reaches, and the nitrogen gas flow divider constructs to make and realizes the heat exchange with intermediate medium and the circulation is then returned a part of the nitrogen gas of nitrogen gas blending tank and is supplied with the environmental simulation storehouse.
According to an aspect of the present invention, the liquid nitrogen supply line is further provided with a liquid nitrogen supply flow rate regulating valve and a liquid nitrogen supply distribution valve upstream of the nitrogen gas mixing tank, wherein the liquid nitrogen supply flow rate regulating valve is used to regulate a flow rate of liquid nitrogen supplied to the nitrogen gas mixing tank, and wherein the liquid nitrogen supply distribution valve is configured so that a part of the liquid nitrogen from the liquid nitrogen storage tank is controllably supplied to the environmental simulation cabin.
According to the utility model discloses an aspect, experimental fuel storage tank passes through experimental fuel oil pipe connection with the second grade heat exchanger for the experimental fuel oil that comes from experimental fuel oil storage tank realizes the heat exchange through second grade heat exchanger and intermediate medium, the circulation returns experimental fuel oil storage tank afterwards, still be equipped with experimental fuel oil pump and experimental fuel oil flow control valve in the experimental fuel oil pipeline, wherein, experimental fuel oil pump is used for ordering about experimental fuel oil and circulates in experimental fuel oil pipeline and flow, and wherein, experimental fuel oil flow control valve is used for adjusting the flow of experimental fuel oil in experimental fuel oil pipeline.
The utility model discloses a refrigerating system utilizes the liquid nitrogen as the cold source, makes experimental fuel reach experimental temperature with controllable cooling rate fast through setting up two-stage heat transfer device, but the surplus cold volume that the make full use of one-level heat transfer produced simultaneously reduces the liquid nitrogen consumption when satisfying experimental demand.
Drawings
For a more complete understanding of the present invention, reference is made to the following description of exemplary embodiments, which is to be considered in connection with the accompanying drawings, in which:
fig. 1 is a schematic diagram of a refrigeration system according to a preferred embodiment of the present invention.
The drawings are to scale and are not necessarily to scale, emphasis instead being placed upon clearly illustrating the drawings.
List of reference numerals
10 nitrogen gas mixing tank
11 nitrogen gas circulation pipeline
12 nitrogen circulating fan
13 nitrogen gas circulation flow regulating valve
14 nitrogen gas flow divider
20 first-stage heat exchanger
30 intermediate medium storage tank
31 heat exchanger tube
32 heat exchanger pump
33 flow regulating valve of heat exchange device
40 two-stage heat exchanger
50 test fuel storage tank
51 test fuel pipeline
52 test fuel pump
53 experimental fuel flow control valve
60 liquid nitrogen storage tank
61 liquid nitrogen supply line
63 liquid nitrogen supply flow regulating valve
64 liquid nitrogen supply distribution valve
70 environmental simulation bin.
Detailed Description
The present invention will be further described with reference to the following embodiments and drawings, and more details will be set forth in the following description in order to provide a thorough understanding of the present invention, but it is obvious that the present invention can be implemented in various other ways different from those described herein, and those skilled in the art can make similar generalizations and deductions according to the actual application without departing from the spirit of the present invention, and therefore, the scope of the present invention should not be limited by the contents of the embodiments.
Fig. 1 schematically shows the refrigeration system of the preferred embodiment of the present invention, which includes a cold end device for providing low-temperature nitrogen gas, a test fuel storage tank 50 for storing the test fuel to be cooled, and a heat exchange device for realizing the heat exchange between the low-temperature nitrogen gas and the test fuel. As used herein, "cryogenic nitrogen" refers to vaporized liquid nitrogen at a temperature below that of the test fuel to be reduced in temperature, and the temperature of "cryogenic nitrogen" is in the range of approximately-196 degrees Celsius to-60 degrees Celsius.
The utility model discloses a preferred embodiment, heat transfer device is two-stage heat transfer device, it includes one-level heat exchanger 20 and second grade heat exchanger 40, wherein one-level heat exchanger 20 and second grade heat exchanger 40 pass through heat transfer device pipeline 31 and connect, this two-stage heat transfer device adopts the intermediate medium as the medium, makes liquid nitrogen and experimental fuel's heat transfer rate easily control and accord with relevant requirement, intermediate medium temperature controllability is strong, the difference in temperature on cold and hot limit of second grade heat exchanger can accurate control, prevent that moisture in the fuel from gathering in the heat exchanger is inside. Specifically, the low temperature nitrogen of the cold end device flows through the primary heat exchanger 20, so that the low temperature nitrogen from the cold end device is heat exchanged with the intermediate medium through the primary heat exchanger 20, and the test fuel of the test fuel storage tank 50 flows through the secondary heat exchanger 40, so that the intermediate medium is heat exchanged with the test fuel from the test fuel storage tank 50 through the secondary heat exchanger 40.
According to relevant test requirements, in an icing test, the temperature difference between a cold edge and a hot edge when the test fuel oil is cooled is smaller than 12 degrees, so that the moisture in the test fuel oil is prevented from being condensed, otherwise, the moisture in the test fuel oil is easily frozen in the heat exchanger, and the water content of the test fuel oil is not in line with the test requirements. In testing, the target temperature of the cryogenic test fuel stored in the test fuel storage tank (50) is-50 degrees celsius, and therefore the refrigeration medium of the heat exchange device needs to be above-62 degrees celsius, for example at about-60 degrees celsius. The intermediate medium is therefore desirably selected from materials having a freezing point below-62 degrees celsius, such as a fluorinated liquid or an anti-freezing liquid. In a preferred embodiment, a fluorinated liquid having a freezing point of-100 degrees Celsius is selected that is less viscous at low temperatures and that readily flows in a conduit, such as heat exchange means conduit 31. In another embodiment, sixty-five antifreeze can be selected as an intermediate medium, the freezing point of the commercially available sixty-five antifreeze is-65 ℃, and the antifreeze is prepared from ethylene glycol, distilled water and proper amount of antioxidant, anticorrosive agent and the like. In yet another embodiment, a synthetic heat transfer fluid (such as synthetic thermal oil) may also be selected
D12, the component of which is a synthetic hydrocarbon refrigerant) as an intermediate medium.
As shown in fig. 1, in a preferred embodiment of the present invention, the heat exchanger line 31 is a single circulation loop, and specifically, the intermediate medium storage tank 30, the primary heat exchanger 20, and the secondary heat exchanger 40 are connected by the heat exchanger line 31. The intermediate medium provided by the intermediate medium storage tank 30 sequentially flows through the primary heat exchanger 20 and the secondary heat exchanger 40 in the heat exchange device pipeline 31 and then circularly returns to the intermediate medium storage tank 30, the cold energy of the liquid nitrogen is transmitted to the test fuel oil, the temperature of the intermediate medium is controlled by controlling the flow rate and the circulating speed of the intermediate medium, and further the relevant cooling requirements of the test fuel oil are met.
In a preferred embodiment, a heat exchanger pump 32 is further provided in the heat exchanger line 31, and the heat exchanger pump 32 may be provided upstream of the primary heat exchanger 20 for driving the intermediate medium to circulate in the heat exchanger line 31. In the preferred embodiment, a heat exchanger flow control valve 33 is further provided in the thermal device conduit 31, and the heat exchanger flow control valve 33 may be provided downstream of the secondary heat exchanger 40, and the circulation flow rate of the intermediate medium is adjusted by the heat exchanger flow control valve 33. In the embodiment shown in fig. 1, the circulation direction of the intermediate medium is counterclockwise.
During the test, the heat exchanger pump 32 pumped the intermediate medium into the primary heat exchanger 20 for heat exchange with the cryogenic nitrogen from the cold side unit. The reduced temperature intermediate medium then flows further through the secondary heat exchanger 40 to exchange heat with the test fuel from the test fuel storage tank. The warmed intermediate medium is then returned to the intermediate medium tank for subsequent circulation.
Turning now to the cold-side apparatus, in the preferred embodiment, the cold-side apparatus includes a nitrogen mixing tank 10 that provides cryogenic nitrogen to the primary heat exchanger 20 and a liquid nitrogen storage tank 60 that provides liquid nitrogen to the nitrogen mixing tank 10 and to an environmental simulation chamber 70.
According to the utility model discloses a preferred embodiment, nitrogen gas blending tank 10 passes through nitrogen gas circulation pipeline 11 with one-level heat exchanger 20 and is connected for the liquid nitrogen that comes from nitrogen gas blending tank 10 realizes the heat exchange through one-level heat exchanger 20 and intermediate medium, and the circulation returns nitrogen gas blending tank 10 afterwards.
In the preferred embodiment, a nitrogen recycle line 11 is also provided with a nitrogen recycle blower 12, and the nitrogen recycle blower 12 may be provided upstream of the primary heat exchanger 20 for driving the low-temperature nitrogen to circulate in the nitrogen recycle line 11. In the preferred embodiment, a nitrogen circulation flow regulating valve 13 is further disposed in the nitrogen circulation pipeline 11, and the nitrogen circulation flow regulating valve 13 may also be disposed upstream of the primary heat exchanger 20, and the circulation flow of nitrogen is regulated by the nitrogen circulation flow regulating valve 13. In the embodiment shown in fig. 1, the nitrogen gas is circulated in a counterclockwise direction.
During the test, liquid nitrogen was continuously fed into the nitrogen circulation system to provide the required refrigeration. In the preferred embodiment, the nitrogen mixing tank 10 is supplied with unused liquid nitrogen from a liquid nitrogen storage tank 60 via a liquid nitrogen supply line 61. The liquid nitrogen is sprayed into the nitrogen mixing tank, gasified and mixed with the heated nitrogen in the nitrogen mixing tank 10 for temperature regulation, and is supplied to the circulation later. In the preferred embodiment, the liquid nitrogen supply line 61 is further provided with a liquid nitrogen supply flow rate regulating valve 63 upstream of the nitrogen gas mixing tank 10 for regulating the flow rate of liquid nitrogen supplied to the nitrogen gas mixing tank 10.
During the test, the target temperature of the environmental simulation chamber 70 was-40 degrees Celsius. Therefore, the liquid nitrogen storage tank 60 also supplies liquid nitrogen to the environmental simulation chamber 70 to cool it down. In the preferred embodiment, the liquid nitrogen supply line 61 is further provided with a liquid nitrogen supply distribution valve 64 upstream of the nitrogen mixing tank 10, the liquid nitrogen supply distribution valve 64 may be, for example, a three-way valve, an electronic distribution valve, or the like, and is controllably branched to the environmental simulation chamber 70 so that a portion of the liquid nitrogen from the liquid nitrogen storage tank 60 can be supplied to the environmental simulation chamber 70. In further embodiments, the liquid nitrogen storage tank 60 and the environmental simulation chamber 70 may be directly connected by additional piping.
During the test, liquid nitrogen was continuously charged into the nitrogen circulation system in order to provide the required cold, so that low-temperature nitrogen gas was continuously generated in the nitrogen circulation system, which may increase the pressure in the nitrogen circulation line. In order to keep the pressure of the nitrogen circulating system normal, part of the low-temperature nitrogen absorbing heat needs to be continuously discharged, and the discharge temperature is lower than-60 ℃, so that the cooling requirement of the environment simulation bin 70 is still met. Therefore, in the preferred embodiment, the nitrogen recycle line 11 is also provided with a nitrogen diverter valve 14 downstream of the primary heat exchanger 20. The nitrogen gas shunt valve 14 may be, for example, a three-way valve, an electronic distribution valve, etc., and is controllably shunted and connected to the environment simulation chamber 70 so that a part of the nitrogen gas that is heat-exchanged with the intermediate medium and then circulated back to the nitrogen gas mixing tank 10 can be supplied to the environment simulation chamber 70, and thus can be used for temperature adjustment of the environment simulation chamber, and secondary utilization rather than direct discharge is performed, and the surplus cold is fully utilized, which further improves the utilization rate of the cold of the liquid nitrogen, and reduces the refrigeration cost.
Turning now to the test fuel tank 50 and its surrounding piping. According to the preferred embodiment of the present invention, this test fuel storage tank 50 is connected with the secondary heat exchanger 40 through the test fuel line 51, so that the test fuel from the test fuel storage tank 50 is heat exchanged with the intermediate medium through the secondary heat exchanger 40, and then circulated back to the test fuel storage tank 50.
In the preferred embodiment, a test fuel pump 52 is also disposed in the test fuel line 51, and the test fuel pump 52 may be disposed upstream of the secondary heat exchanger 20 for circulating the test fuel to be cooled in the test fuel line 51. In the preferred embodiment, a test fuel flow regulating valve 53 is also provided in the test fuel line 51, and the test fuel flow regulating valve 53 may be provided downstream of the secondary heat exchanger 40, and the circulating flow of the test fuel is regulated by the test fuel flow regulating valve 53. The direction of circulation of the test fuel in the embodiment shown in figure 1 is counter-clockwise.
According to the refrigeration system disclosed by the invention, liquid nitrogen is used as a cold source for cooling the test fuel oil and the environment simulation cabin, and the refrigeration system has the advantages of large cooling range, high cooling efficiency, safety, no pollution and the like; the intermediate medium is used to form a two-stage refrigeration system, the circulating gas and the liquid nitrogen are mixed for temperature regulation to form a cold-side medium while the primary heat exchange cold side is used, the cold energy of the liquid nitrogen can be fully utilized, the liquid nitrogen consumption in the test process is reduced, the allowable temperature difference range of the cold side and the hot side of the heat exchanger is large, and the heat exchange efficiency is high; the heat exchange is carried out with the fuel in the middle of the second grade refrigeration use, and middle medium temperature controllability is strong, can the difference in temperature on the cold and hot limit of accurate control second grade heat exchanger, prevents that the moisture in the fuel from gathering in the heat exchanger is inside, and middle medium heat capacity can compromise the fuel cooling rate. The cold-side waste gas of the primary heat exchanger is introduced into the cooling system of the environmental simulation cabin and used for adjusting the temperature of the environmental simulation cabin, so that the utilization rate of liquid nitrogen cold energy is further improved, and the refrigeration cost is reduced.
While various embodiments have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to those skilled in the relevant art that the disclosed subject matter can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and not as a basis for any limitation on the invention.
Claims (10)
1. A refrigeration system for use in testing a fuel system, the refrigeration system comprising:
a cold end device having cryogenic nitrogen;
a test fuel tank (50) configured to store a test fuel; and
the low-temperature nitrogen from the cold end device exchanges heat with the test fuel from the test fuel storage tank (50) through the heat exchange device,
it is characterized in that the preparation method is characterized in that,
the heat exchange device comprises a primary heat exchanger (20) and a secondary heat exchanger (40), the primary heat exchanger (20) and the secondary heat exchanger (40) are connected through a heat exchange device pipeline (31), an intermediate medium flows through the primary heat exchanger (20) and the secondary heat exchanger (40) through the heat exchange device pipeline (31),
wherein the cryogenic nitrogen of the cold end device flows through the primary heat exchanger (20) such that the cryogenic nitrogen from the cold end device exchanges heat with the intermediate medium through the primary heat exchanger (20), and
wherein the test fuel of the test fuel storage tank (50) flows through the secondary heat exchanger (40) such that the intermediate medium is brought into heat exchange with the test fuel from the test fuel storage tank (50) through the secondary heat exchanger (40).
2. The refrigerant system as set forth in claim 1,
the heat exchange device further comprises an intermediate medium tank (30) for supplying the intermediate medium, the intermediate medium tank (30) being connected to the primary heat exchanger (20) and the secondary heat exchanger (40) by the heat exchange device conduit (31).
3. The refrigerant system as set forth in claim 2,
the heat exchanger tube (31) is a single circulation loop,
wherein the intermediate medium storage tank (30), the primary heat exchanger (20) and the secondary heat exchanger (40) are connected by the heat exchange device pipeline (31).
4. The refrigerant system as set forth in claim 1,
the intermediate medium is fluorinated liquid or sixty-five antifreezing solution.
5. The refrigerant system as set forth in claim 1,
a heat exchange device pump (32) and a heat exchange device flow regulating valve (33) are also arranged in the heat exchange device pipeline (31),
wherein the heat exchanger pump (32) is adapted to driving the intermediate medium to circulate in the heat exchanger line (31), and
wherein the heat exchanger flow regulating valve (33) is used for regulating the flow of the intermediate medium in the heat exchanger pipe (31).
6. The refrigerant system as set forth in claim 1,
the cold end device comprises a nitrogen mixing tank (10) and a liquid nitrogen storage tank (60),
wherein the nitrogen mixing tank (10) is connected with the primary heat exchanger (20) through a nitrogen circulating pipeline (11), so that the low-temperature nitrogen from the nitrogen mixing tank (10) is subjected to heat exchange with the intermediate medium through the primary heat exchanger (20) and then circulated back to the nitrogen mixing tank (10), and
wherein the liquid nitrogen storage tank (60) supplies unused liquid nitrogen to the nitrogen mixing tank (10) through a liquid nitrogen supply line (61).
7. The refrigerant system as set forth in claim 6,
a nitrogen circulating fan (12) and a nitrogen circulating flow regulating valve (13) are also arranged in the nitrogen circulating pipeline (11),
wherein the nitrogen circulating fan (12) is used for driving nitrogen to circularly flow in the nitrogen circulating pipeline (11), and
wherein the nitrogen circulation flow regulating valve (13) is used for regulating the flow of nitrogen in the nitrogen circulation pipeline (11).
8. The refrigerant system as set forth in claim 6,
the nitrogen circulation line (11) is further provided with a nitrogen diverter valve (14) downstream of the primary heat exchanger (20), and the nitrogen diverter valve (14) is configured to supply a part of the nitrogen which is heat exchanged with the intermediate medium and then circulated back to the nitrogen mixing tank (10) to an environment simulation bin (70).
9. The refrigerant system as set forth in claim 6,
the liquid nitrogen supply pipeline (61) is also provided with a liquid nitrogen supply flow regulating valve (63) and a liquid nitrogen supply distributing valve (64) at the upstream of the nitrogen mixing tank (10),
wherein the liquid nitrogen supply flow rate adjustment valve (63) is used for adjusting the flow rate of liquid nitrogen supplied to the nitrogen gas mixing tank (10), and
wherein the liquid nitrogen supply distribution valve (64) is configured such that a portion of liquid nitrogen from the liquid nitrogen storage tank (60) is controllably supplied to an environmental simulation chamber (70).
10. The refrigerant system as set forth in claim 1,
the test fuel storage tank (50) is connected to the secondary heat exchanger (40) via a test fuel line (51) in such a way that test fuel from the test fuel storage tank (50) is brought into heat exchange with the intermediate medium via the secondary heat exchanger (40) and is subsequently circulated back to the test fuel storage tank (50),
the test fuel pipeline (51) is also provided with a test fuel pump (52) and a test fuel flow regulating valve (53),
wherein the test fuel pump (52) is adapted to circulate the test fuel in the test fuel line (51), and
wherein the test fuel flow regulating valve (53) is used for regulating the flow of the test fuel in the test fuel pipeline (51).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120581153.5U CN214469508U (en) | 2021-03-22 | 2021-03-22 | Refrigerating system for fuel system test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120581153.5U CN214469508U (en) | 2021-03-22 | 2021-03-22 | Refrigerating system for fuel system test |
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| CN214469508U true CN214469508U (en) | 2021-10-22 |
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| CN202120581153.5U Active CN214469508U (en) | 2021-03-22 | 2021-03-22 | Refrigerating system for fuel system test |
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- 2021-03-22 CN CN202120581153.5U patent/CN214469508U/en active Active
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