CN105202812A - Refrigerator car and heating unit thereof - Google Patents
Refrigerator car and heating unit thereof Download PDFInfo
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- CN105202812A CN105202812A CN201510600249.0A CN201510600249A CN105202812A CN 105202812 A CN105202812 A CN 105202812A CN 201510600249 A CN201510600249 A CN 201510600249A CN 105202812 A CN105202812 A CN 105202812A
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Abstract
The invention provides a refrigerator car and a heating unit thereof. The heating unit comprises a compressor, an indoor heat exchanger and a gas-liquid separator, wherein an inlet of the indoor heat exchanger is connected to an outlet of the compressor by virtue of a first pipeline, and the first pipeline is provided with a defrosting control valve; an inlet pipe of the gas-liquid separator is connected to the outlet of the compressor by virtue of a second pipeline, an outlet pipe of the gas-liquid separator is connected to the inlet of the compressor, the second pipeline is provided with a heating control valve, and an outlet of the indoor heat exchanger is connected to the inlet pipe of the gas-liquid separator. By adopting the heating unit, gaseous overheated coolant at an exhaust side of the compressor is mixed with liquid coolant at the outlet of the indoor heat exchanger, the coolant sucked by the compressor is ensured to stay at a low-pressure vapor state, so that the compressor can apply more work to the coolant, the temperature of the coolant heated by the indoor heat exchanger is higher, the liquidation of the coolant can release more heat, the heat exchanging efficiency when heating in a refrigerator car carriage can be improved, the temperature fluctuation in the carriage can be reduced, and the temperature inside the carriage can be accurately and stably controlled.
Description
Technical field
The present invention relates to refrigerator car technical field, more particularly, relate to a kind of refrigerator car and heating machine set thereof.
Background technology
Being applied to environment temperature is G class refrigerator car under-20 DEG C ~+40 DEG C conditions, and in envelope, temperature needs to maintain 2 DEG C ~ 8 DEG C.At present, when the temperature of the surroundings is low, in refrigerator car envelope, the mode adopting engine water waste-heat, utilizes engine water waste heat to provide heat, makes temperature in envelope be increased to 2 DEG C ~ 8 DEG C more.
But when refrigerator car idling, the water temperature of engine is lower, and water waste heat is not enough to provide heat; And when utilizing hot-water heating for providing heat in refrigerated vehicle carriage, heat exchange efficiency is lower; The fluctuating temperature of engine is comparatively large simultaneously, and cause each point temperature fluctuation in envelope also comparatively large, more difficult making reaches stable preset temperature in envelope.
In sum, how to improve heat exchange efficiency when heating in refrigerated vehicle carriage, reduce the temperature fluctuation in envelope simultaneously, thus accurate stable ground controlling the temperature in envelope, is current those skilled in the art technical problems urgently to be resolved hurrily.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of heating machine set of refrigerator car, to improve heat exchange efficiency when heating in refrigerated vehicle carriage, reduce the temperature fluctuation in envelope, thus accurate stable ground controls the temperature in envelope simultaneously.
Another object of the present invention is to provide a kind of refrigerator car with above-mentioned heating machine set, to improve heat exchange efficiency when heating in refrigerated vehicle carriage, reduce the temperature fluctuation in envelope, thus accurate stable ground controls the temperature in envelope.
In order to achieve the above object, the invention provides following technical scheme:
A heating machine set for refrigerator car, comprising:
Compressor;
Indoor heat exchanger, the import of described indoor heat exchanger is connected with the outlet of described compressor by the first pipeline, and described first pipeline is provided with defrost control valve;
Gas-liquid separator, the inlet pipe of described gas-liquid separator is connected with the outlet of described compressor by the second pipeline, the pipe that goes out of described gas-liquid separator is connected with the import of described compressor, and described second pipeline is provided with heats by-pass valve control, the outlet of described indoor heat exchanger is connected with the inlet pipe of described gas-liquid separator.
Preferably, above-mentioned heating machine set also comprises oil eliminator, and the import of described oil eliminator is connected with the outlet of described compressor, and described first pipeline is all connected with the outlet of described oil eliminator with described second pipeline.
Preferably, in above-mentioned heating machine set, the outlet of described oil eliminator is connected with described first pipeline and described second pipeline by the 3rd pipeline, and described 3rd pipeline is provided with high and low voltage switch.
Preferably, in above-mentioned heating machine set, described defrost control valve for defrosting magnetic valve, described in heat by-pass valve control for heating magnetic valve, described heating machine set also comprises when heating, control described defrosting magnetic valve and described heat magnetic valve unlatching the first controller.
Preferably, above-mentioned heating machine set also comprises:
Be arranged on the air outlet place of described indoor heat exchanger and send the temperature sensor of temperature signal;
Accept temperature signal, control the second controller that described compressor cuts out when the temperature in described exit reaches preset temperature value, described second controller is connected with described temperature sensor.
Preferably, in above-mentioned heating machine set, described first pipeline is also provided with the first check (non-return) valve, described first check (non-return) valve is positioned at described defrost control valve near the side of described indoor heat exchanger;
Going out between pipe and the import of described compressor of described gas-liquid separator is also provided with pressure-regulating valve.
As can be seen from above-mentioned technical scheme, the heating machine set of refrigerator car provided by the invention comprises compressor, indoor heat exchanger and gas-liquid separator, the import of indoor heat exchanger is connected with the outlet of compressor by the first pipeline, the first pipeline is provided with defrost control valve; The inlet pipe of gas-liquid separator is connected with the outlet of compressor by the second pipeline, and the going out to manage of gas-liquid separator is connected with the import of compressor, and the second pipeline is provided with heats by-pass valve control, and the outlet of indoor heat exchanger is connected with the inlet pipe of gas-liquid separator.
When heating, open defrost control valve and heat by-pass valve control, a part for compressor is made to be vented the defrosting coil being entered into indoor heat exchanger by the first pipeline, flow in the core body of indoor heat exchanger, now gaseous coolant liquidation exothermic reaction in indoor heat exchanger (now playing the function of condenser), the envelope being refrigerator car by indoor fan heat exchange provides heat; The liquid refrigerants that another part exhaust is exported by the second pipeline and indoor heat exchanger is mixed into moist steam, gets back to compressor through gas-liquid separator.
The heating machine set of refrigerator car of the present invention adds a hot gas bypass circuit i.e. the second pipeline at the exhaust side of compressor, the liquid refrigerants that the overheated refrigerant of the gaseous state of compressor air-discharging side and indoor heat exchanger are exported mixes, ensure that the refrigerant of compressor suction is in the state of a low-pressure steam, such compressor can be more to refrigerant acting, from compressor discharge refrigerant temperature, pressure can be higher, thus making the refrigerant temperature entering indoor heat exchanger heating higher, cooling medium liquefaction can discharge more heat.
In summary, the heating machine set of refrigerator car provided by the invention can improve heat exchange efficiency when heating in refrigerated vehicle carriage, and simultaneously by the temperature fluctuation that the phase transformation of refrigerant provides heat can reduce in envelope, thus accurate stable ground controls the temperature in envelope.
Present invention also offers a kind of refrigerator car, comprise envelope, also comprise and realizing the heating machine set heated in described envelope, described heating machine set is any one heating machine set above-mentioned, because above-mentioned heating machine set has above-mentioned effect, the air-conditioning with above-mentioned temperature sensing device has same effect, therefore repeats no more herein.
Preferably, described refrigerator car also comprises realization to the refrigeration unit of freezing in described envelope, and described refrigeration unit comprises:
Outdoor heat exchanger, the import of described outdoor heat exchanger is connected with the outlet of described compressor by the 4th pipeline, described 4th pipeline is provided with refrigeration control valve, the outlet of described outdoor heat exchanger is connected with the import of described indoor heat exchanger by the 5th pipeline, and described 5th pipeline is provided with expansion valve.
Preferably, in above-mentioned refrigerator car, described 5th pipeline is also provided with drying bottle, and described drying bottle is positioned at the side of described expansion valve near described outdoor heat exchanger, and is also provided with the second check (non-return) valve between described drying bottle and described expansion valve.
Preferably, in above-mentioned refrigerator car, described refrigeration control valve is refrigeration magnetic valve, and described refrigeration unit also comprises when cooling, controls the 3rd controller that described refrigeration magnetic valve is opened.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the heating machine set of the refrigerator car that the embodiment of the present invention provides and the structure principle chart of refrigeration unit.
Detailed description of the invention
Embodiments provide a kind of heating machine set of refrigerator car, heat exchange efficiency when heating in refrigerated vehicle carriage can be improved, reduce the temperature fluctuation in envelope simultaneously, thus accurate stable ground controls the temperature in envelope.
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to accompanying drawing 1, the heating machine set of the refrigerator car that the embodiment of the present invention provides comprises compressor 1, indoor heat exchanger 15 and gas-liquid separator 17, the import of indoor heat exchanger 15 is connected with the outlet of compressor 1 by the first pipeline 13, and the first pipeline 13 is provided with defrost control valve 10; The inlet pipe of gas-liquid separator 17 is connected with the outlet of compressor 1 by the second pipeline 14, the pipe that goes out of gas-liquid separator 17 is connected with the import of compressor 1, and the second pipeline 14 is provided with heats by-pass valve control 11, the outlet of indoor heat exchanger 15 is connected with the inlet pipe of gas-liquid separator 17.
Concrete, the refrigerant (cold-producing medium) that the present invention uses is R404A, R404A is mixed by HFC125, HFC-134a and HFC-143, be colourless gas at normal temperatures, it is colourless transparent liquid under pressure itself, its compression ratio is larger, pressure at expulsion and delivery temperature high, more heat can be provided.
When heating, open defrost control valve 10 and heat by-pass valve control 11, a part for compressor 1 is made to be vented the defrosting coil being entered into indoor heat exchanger 15 by the first pipeline 13, flow in the core body of indoor heat exchanger 15, now gaseous coolant liquidation exothermic reaction in indoor heat exchanger 15 (now playing the function of condenser), the envelope being refrigerator car by indoor fan heat exchange provides heat; The liquid refrigerants that another part exhaust is exported by the second pipeline 14 and indoor heat exchanger 15 is mixed into moist steam, gets back to compressor 1 through gas-liquid separator 17, and dotted arrow direction as shown in Figure 1 is refrigerant trend when heating.
The heating machine set of refrigerator car of the present invention adds a hot gas bypass circuit i.e. the second pipeline 14 at the exhaust side of compressor 1, the liquid refrigerants that the overheated refrigerant of gaseous state of compressor 1 exhaust side and indoor heat exchanger 15 are exported mixes, ensure that the refrigerant of compressor 1 suction is in the state of a low-pressure steam, such compressor 1 can be more to refrigerant acting, from compressor 1 discharge refrigerant temperature, pressure can be higher, thus making the refrigerant temperature entering indoor heat exchanger 15 heating higher, cooling medium liquefaction can discharge more heat.
In summary, the heating machine set of refrigerator car provided by the invention can improve heat exchange efficiency when heating in refrigerated vehicle carriage, and simultaneously by the temperature fluctuation that the phase transformation of refrigerant provides heat can reduce in envelope, thus accurate stable ground controls the temperature in envelope.
In addition, the refrigerant that the present invention makes the portion discharge of compressor 1 and indoor heat exchanger 15 export mixes, and can ensure the normal work of system under low temperature environment.
Preferably, heating machine set also comprises oil eliminator 9, and the import of oil eliminator 9 is connected with the outlet of compressor 1, and the first pipeline 13 is all connected with the outlet of oil eliminator 9 with the second pipeline 14.Lubricating oil in the high steam that the present invention utilizes oil eliminator 9 to be discharged by compressor 1 is separated, and runs safely and efficiently with assurance device.According to point oily principle reducing air velocity and change airflow direction, the elaioleucite in high steam is separated under gravity.
Further, in above-mentioned heating machine set, the outlet of oil eliminator 9 is connected with the first pipeline 13 and the second pipeline 14 by the 3rd pipeline 7, and the 3rd pipeline 7 is provided with high and low voltage switch 8.First pipeline 13 of the present invention is all connected with oil eliminator 9 by the 3rd pipeline 7 with the second pipeline 14, the gaseous coolant pressure of compressor 1 discharge is detected by high and low voltage switch 8, when this pressure exceedes setting, the safety valve of high and low voltage switch 8 is opened, a part of gas in system is entered air, make system pressure be no more than permissible value, thus guarantee system does not have an accident because of hypertonia; Make when there is no refrigerant compressor 1 quit work to protect compressor 1 simultaneously, thus ensure that security reliability.Certainly, this high and low voltage switch 8 can also be arranged on the pipeline between the import of oil eliminator 9 and the outlet of compressor 1.
In order to save manpower, in the heating machine set that above-described embodiment provides, defrost control valve 10 is defrosting magnetic valve, heats by-pass valve control 11 for heating magnetic valve, heating machine set also comprises when heating, and controls defrosting magnetic valve and the first controller heating magnetic valve unlatching.When needs heat, the present invention utilizes the first controller automatically open defrosting magnetic valve and heat magnetic valve, achieves automatic control.Certainly, above-mentioned defrost control valve 10 can also be machinery valve with heating magnetic valve, utilizes the opening and closing of above-mentioned two valves of Artificial Control.
Above-mentioned heating machine set also comprises temperature sensor and second controller temperature sensor, and the air outlet place of heat exchanger 15 disposed in the interior also sends temperature signal; Second controller accepts temperature signal, and close when the temperature in exit reaches preset temperature value time control compressor 1, this second controller is connected with temperature sensor.Whether the temperature at the air outlet place of the indoor heat exchanger 15 that the present invention detects according to temperature sensor and return air temperature, utilize second controller to control compressor 1 and work, and more can control temperature in envelope in accurate stable ground, in envelope, temperature fluctuation reduces further.Certainly, temperature sensor can also be arranged on envelope by the present invention.The present invention can not also set temperature sensor and second controller, utilizes thermometer to detect temperature in envelope, the then keying of Artificial Control engine artificially.
In order to improve the functional reliability of heating machine set further, the first pipeline 13 being also provided with the first check (non-return) valve 12, first check (non-return) valve 12 and being positioned at the side of defrost control valve 10 near indoor heat exchanger 15; The refrigerant that this first check (non-return) valve 12 controls in the first pipeline 13 only can flow to indoor heat exchanger 15 from oil eliminator 9, can control the flow direction of refrigerant safer and more effectively.
Going out between pipe and the import of compressor 1 of above-mentioned gas-liquid separator 17 is also provided with pressure-regulating valve 19.The present invention utilizes gas-liquid separator 17 and pressure-regulating valve 19 can prevent liquid from entering compressor 1 better in the outlet of indoor heat exchanger 15, compressor 1 is run more safe and reliable.Certainly, the present invention also can not arrange pressure-regulating valve 19, only arranges gas-liquid separator 17.
The embodiment of the present invention additionally provides a kind of refrigerator car, comprise envelope, also comprise and realizing the heating machine set heated in envelope, the heating machine set that this heating machine set provides for above-mentioned any one embodiment, can improve heat exchange efficiency when heating in refrigerated vehicle carriage, reduces the temperature fluctuation in envelope, thus accurate stable ground controls the temperature in envelope, its advantage is brought by heating machine set, and concrete please refer to part relevant in above-described embodiment, just repeats no more at this.
Preferably, refrigerator car also comprises realization to the refrigeration unit of freezing in envelope, this refrigeration unit comprises outdoor heat exchanger 4, the import of outdoor heat exchanger 4 is connected with the outlet of compressor 1 by the 4th pipeline 5,4th pipeline 5 is provided with refrigeration control valve 6, the outlet of outdoor heat exchanger 4 is connected with the import of indoor heat exchanger 15 by the 5th pipeline 18, and the 5th pipeline 18 is provided with expansion valve 16.
During refrigeration, open refrigeration control valve 6, close defrost control valve 10 and heat by-pass valve control 11, so, the exhaust of compressor 1 enters in outdoor heat exchanger 4 (now playing the function of condenser) through refrigeration control valve 6, the gaseous coolant of HTHP becomes the liquid of middle temperature high pressure by outdoor heat exchanger 4 condensation, the liquid that the liquid of middle temperature high pressure becomes low-temp low-pressure again after expansion valve 16 reducing pressure by regulating flow enters indoor heat exchanger 15 (now playing the function of evaporimeter).In indoor heat exchanger 15, low pressure liquid refrigerant is vaporized, and absorbs the heat in envelope, thus makes cooling down in envelope; And the cryogenic gaseous refrigerant in indoor heat exchanger 15 after vaporization is re-started compression by compressor 1 suction, do work through compressor 1, make it to become all higher gas of pressure and temperature, enter in outdoor heat exchanger 4, go round and begin again constantly circulation like this, continuous realization is freezed in the envelope of refrigerator car, and solid arrow direction as shown in Figure 1 is refrigerant trend when heating.Heating machine set of the present invention and refrigeration unit integrate, relatively simple for structure, are convenient to assembling.The refrigerator car of the present embodiment possess simultaneously heat, refrigerating function, belong to G class refrigerator car, can meet and maintain 2 DEG C-8 DEG C in envelope under environment temperature-20 DEG C of-40 DEG C of conditions.
Preferably, above-mentioned 5th pipeline 18 is also provided with drying bottle 3, and drying bottle 3 is positioned at the side of expansion valve 16 near outdoor heat exchanger 4, and the present invention utilizes drying bottle 3 to play drying, impurity screening when freezing, and the effect of removing system moisture, improves refrigeration.
Effectively control the flow direction of refrigerant for greater safety, between drying bottle 3 and expansion valve 16, be also provided with the second check (non-return) valve 2.The refrigerant that this second check (non-return) valve 2 controls in the 5th pipeline 18 only can flow to expansion valve 16 by heat exchanger 4 outdoor, improves functional reliability.
In order to optimize technique scheme further, refrigeration control valve 6 is refrigeration magnetic valve, and refrigeration unit also comprises when cooling, controls the 3rd controller that refrigeration magnetic valve is opened.When needs freeze, the present invention utilizes the 3rd controller automatically to open refrigeration magnetic valve, and utilizes the first controller close defrosting magnetic valve and heat magnetic valve, achieves automatic control.Certainly, above-mentioned refrigeration control valve 6 can also be machinery valve, utilizes the opening and closing of this valve of Artificial Control.Concrete, the first controller, second controller and the 3rd controller are all integrated in a control module.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a heating machine set for refrigerator car, is characterized in that, comprising:
Compressor (1);
Indoor heat exchanger (15), the import of described indoor heat exchanger (15) is connected with the outlet of described compressor (1) by the first pipeline (13), and described first pipeline (13) is provided with defrost control valve (10);
Gas-liquid separator (17), the inlet pipe of described gas-liquid separator (17) is connected with the outlet of described compressor (1) by the second pipeline (14), the pipe that goes out of described gas-liquid separator (17) is connected with the import of described compressor (1), and described second pipeline (14) is provided with heats by-pass valve control (11), the outlet of described indoor heat exchanger (15) is connected with the inlet pipe of described gas-liquid separator (17).
2. heating machine set as claimed in claim 1, it is characterized in that, also comprise oil eliminator (9), the import of described oil eliminator (9) is connected with the outlet of described compressor (1), and described first pipeline (13) is all connected with the outlet of described oil eliminator (9) with described second pipeline (14).
3. heating machine set as claimed in claim 2, it is characterized in that, the outlet of described oil eliminator (9) is connected with described first pipeline (13) and described second pipeline (14) by the 3rd pipeline (7), and described 3rd pipeline (7) is provided with high and low voltage switch (8).
4. heating machine set as claimed in claim 1, it is characterized in that, described defrost control valve (10) is defrosting magnetic valve, the described by-pass valve control (11) that heats is for heating magnetic valve, described heating machine set also comprises when heating, and controls described defrosting magnetic valve and described the first controller heating magnetic valve and open.
5. heating machine set as claimed in claim 1, is characterized in that, also comprise:
Be arranged on the air outlet place of described indoor heat exchanger (15) and send the temperature sensor of temperature signal;
Accept temperature signal, control the second controller that described compressor (1) cuts out when the temperature in described exit reaches preset temperature value, described second controller is connected with described temperature sensor.
6. heating machine set as claimed in claim 1, it is characterized in that, described first pipeline (13) is also provided with the first check (non-return) valve (12), and described first check (non-return) valve (12) is positioned at the side of described defrost control valve (10) near described indoor heat exchanger (15);
Going out between pipe and the import of described compressor (1) of described gas-liquid separator (17) is also provided with pressure-regulating valve (19).
7. a refrigerator car, comprises envelope, it is characterized in that, also comprise and realizing the heating machine set heated in described envelope, described heating machine set is the heating machine set as described in any one of claim 1-6.
8. refrigerator car as claimed in claim 7, it is characterized in that, the refrigeration unit that described refrigerator car also comprises, described refrigeration unit comprises:
Outdoor heat exchanger (4), the import of described outdoor heat exchanger (4) is connected with the outlet of described compressor (1) by the 4th pipeline (5), described 4th pipeline (5) is provided with refrigeration control valve (6), the outlet of described outdoor heat exchanger (4) is connected with the import of described indoor heat exchanger (15) by the 5th pipeline (18), and described 5th pipeline (18) is provided with expansion valve (16).
9. refrigerator car as claimed in claim 8, it is characterized in that, described 5th pipeline (18) is also provided with drying bottle (3), described drying bottle (3) is positioned at the side of described expansion valve (16) near described outdoor heat exchanger (4), and is also provided with the second check (non-return) valve (2) between described drying bottle (3) and described expansion valve (16).
10. refrigerator car as claimed in claim 8 or 9, is characterized in that, described refrigeration control valve (6) is refrigeration magnetic valve, and described refrigeration unit also comprises when cooling, controls the 3rd controller that described refrigeration magnetic valve is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510600249.0A CN105202812A (en) | 2015-09-17 | 2015-09-17 | Refrigerator car and heating unit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510600249.0A CN105202812A (en) | 2015-09-17 | 2015-09-17 | Refrigerator car and heating unit thereof |
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| CN105202812A true CN105202812A (en) | 2015-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510600249.0A Pending CN105202812A (en) | 2015-09-17 | 2015-09-17 | Refrigerator car and heating unit thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108826740A (en) * | 2018-05-14 | 2018-11-16 | 航天新长征电动汽车技术有限公司 | A kind of spray head, fountain liquid nitrogen refrigerating system and refrigerator car |
| CN115289730A (en) * | 2022-08-31 | 2022-11-04 | 珠海格力电器股份有限公司 | Refrigerating unit, unit control method and device |
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| CN204165262U (en) * | 2014-09-16 | 2015-02-18 | 澳柯玛股份有限公司 | A kind of refrigeration unit and refrigerator car |
| CN205102459U (en) * | 2015-09-17 | 2016-03-23 | 广西汽车集团有限公司 | Refrigerator car and unit heats thereof |
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| CN101539348A (en) * | 2008-03-18 | 2009-09-23 | Lg电子株式会社 | Air conditioner and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108826740A (en) * | 2018-05-14 | 2018-11-16 | 航天新长征电动汽车技术有限公司 | A kind of spray head, fountain liquid nitrogen refrigerating system and refrigerator car |
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Application publication date: 20151230 |