Double-enthalpy-increasing air energy ultralow-temperature heating hot water system equipment

Abstract

Double-enthalpy-increasing air energy ultralow-temperature heating hot water system equipment comprises an enhanced vapor injection compressor, a plate heat exchanger, an evaporator, a main expansion valve, a double-enthalpy-increasing gas-liquid separator, an auxiliary expansion valve, a condensation exchanger and a rack. Wherein an exhaust port of the enhanced vapor injection compressor is connected with an air inlet end of the plate heat exchanger through the four-way valve, an outlet of the plate heat exchanger is connected with an inlet of the evaporator through the main expansion valve, an outlet of the evaporator is connected with an inlet of the double-enthalpy-increase gas-liquid separator, and an outlet of the double-enthalpy-increase gas-liquid separator is connected with an air return port of the enhanced vapor injection compressor. The double-enthalpy-increasing gas-liquid separator has the advantages that an innovative electromagnetic heating system is designed and used for heating the shell of the double-enthalpy-increasing gas-liquid separator, and it is guaranteed that the system can operate normally and efficiently in the ultralow-temperature environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of dual-incremental enthalpy air energy super-low temperature heating hot water system equipment. BACKGROUND

[0002] With the rapid development of air energy technology, air source heat pump Air Source Heat Pump, simply ASHP as a kind of efficient energy utilization mode, gradually be applied in low temperature heating system. However, in low temperature environment, the existing low temperature heating hot water system still has some obvious shortcomings, especially when ambient temperature is lower than-8 ℃, the stability of system operation and heat exchange effect significantly decline, seriously affect the working efficiency of system and the service life of equipment.

[0003] Traditional low temperature heating system uses compressor, expansion valve, evaporator, condenser and other basic components to work, relies on refrigerant in system to complete heat absorption and release. However, in low temperature environment-8 ℃~25 ℃, due to the physical properties of refrigerant, the existing system has following several key problems:

[0004] 1. poor refrigerant heat exchange effect in low temperature environment: the heat exchange effect of traditional low temperature heating system is seriously insufficient in low temperature environment. Because the evaporation temperature of refrigerant in this environment is low, the refrigerant in evaporator cannot be fully evaporated many times, resulting in extremely low heat exchange efficiency. When ambient temperature is low, refrigerant almost cannot evaporate into gas in evaporator, and basically liquid refrigerant enters vapor-liquid separator. This liquid refrigerant does not have enough gas mixture when entering vapor-liquid separator, so there is lack of gas in separator for effective gas-liquid separation, resulting in failure of fluid circulation of system.

[0005] 2. vapor-liquid separator cannot work normally: because refrigerant is mainly in liquid state when running in low temperature, the refrigerant entering vapor-liquid separator is almost completely liquid, which makes vapor-liquid separator unable to effectively separate gas and liquid, causing compressor to suck liquid refrigerant instead of gas. In this case, the suction port of compressor sucks liquid instead of gas, which is called "liquid knock". Liquid knock can cause serious damage to compressor, because liquid cannot be compressed by piston of compressor, which can cause mechanical parts damage, and even cause complete failure of compressor.

[0006] 3. Compressor high exhaust temperature problem: In the case of liquid refrigerant entering the compressor, the compressor will bear an abnormal working load. The suction of liquid refrigerant will cause the compressor to have a liquid strike phenomenon and cause the temperature of the compressor exhaust port to rise. This high exhaust temperature not only affects the thermal efficiency of the system, but also causes the compressor to run at high temperature for a long time, thereby accelerating the damage of the compressor. The reason for the high exhaust temperature is that the refrigerant is not fully gasified during compression, but is directly compressed, causing the compressor exhaust temperature to be much higher than normal.

[0007] 4. Limitations of traditional enthalpy increasing system: In order to deal with the heat exchange problem of refrigerant at low temperature, the traditional system adopts the method of economizer enthalpy increasing, that is, the low temperature gas of the exhaust is recovered by the economizer and is guided back to the compressor to improve the thermal efficiency of the system. However, in low temperature environment, the traditional economizer enthalpy increasing system does not have significant effect. When the compressor exhaust volume is small and the main expansion valve of the system is closed, the exhaust gas of the compressor will flow through the low temperature gas of the economizer back to the compressor after being throttled by the enthalpy increasing expansion valve. In this case, due to the small flow of low temperature gas, the exhaust temperature of the compressor cannot be effectively neutralized, ultimately causing the compressor to run at high exhaust temperature for a long time. This high exhaust temperature persists and becomes a fatal factor leading to compressor failure and damage. Therefore, it is necessary to make further improvements. Invention content

[0008] The purpose of the present application is to overcome the shortcomings of the prior art, provide a double enthalpy increasing air energy super low temperature heating hot water system equipment which is simple in structure, convenient to use, can effectively improve the heat exchange efficiency of the system, protect the normal operation of the compressor at low temperature, and prolong the service life of the equipment.

[0009] The purpose of the present application is achieved in the following way: a double enthalpy increasing air energy super low temperature heating hot water system equipment, comprising:

[0010] The jet enthalpy increasing compressor, the plate heat exchanger, the evaporator, the main expansion valve, the double enthalpy increasing gas-liquid separator, the auxiliary expansion valve condensing exchanger and the rack are connected.

[0011] The exhaust port of the jet enthalpy increasing compressor is connected to the gas inlet end of the plate heat exchanger through a four-way valve, the outlet of the plate heat exchanger is connected to the inlet of the evaporator through a main expansion valve, the outlet of the evaporator is connected to the inlet of the double enthalpy increasing gas-liquid separator, and the outlet of the double enthalpy increasing gas-liquid separator is connected to the gas return port of the jet enthalpy increasing compressor.

[0012] The outlet of the plate heat exchanger is connected to the inlet of the condensing exchanger arranged inside the double enthalpy increasing gas-liquid separator through an auxiliary expansion valve, and the outlet of the condensing exchanger is connected to the gas supplement port of the jet enthalpy increasing compressor.

[0013] The shell of the double enthalpy-increasing gas-liquid separator is covered with an electromagnetic coil connected with a master control system.

[0014] The evaporator adopts a horizontal placement structure, the bottom of which is an air inlet face, and a spoiler is arranged on the air inlet face, and a fan capable of being reversely rotated is arranged at the top of the evaporator and is connected with a control system.

[0015] Further, a first electromagnetic valve is connected in series between the plate heat exchanger and the auxiliary expansion valve.

[0016] Further, the condensation exchanger is a coil pipe spirally coiled inside the double enthalpy-increasing gas-liquid separator.

[0017] Further, the shell of the double enthalpy-increasing gas-liquid separator is made of ferromagnetic material, and the electromagnetic coil is spirally coiled on the shell.

[0018] Further, a glass fiber isolation layer is arranged between the electromagnetic coil and the shell of the double enthalpy-increasing gas-liquid separator.

[0019] Further, the spoiler is in an "eight" shape with the middle being high and the two sides being low.

[0020] Further, the evaporator is horizontally arranged in the middle of the rack, the fan is arranged at the top of the rack, and the spoiler is arranged at the bottom of the evaporator, air flows into the evaporator from both sides through the guide plate, vertically upwards, and is finally discharged upwards through the fan.

[0021] The evaporator is horizontally arranged, the heat exchange efficiency is optimized, and the stability and reliability of the equipment are improved.

[0022] 2, evaporator design, optimization of heat exchange efficiency: in the traditional low temperature heating system, the evaporator usually adopts vertical or V type placement method, this design can only make about 70% of the heat exchange area play a role, resulting in low heat exchange efficiency. The horizontal design of the present application places the evaporator on the equipment support, so that the heat exchange surface can fully contact the refrigerant fluid and fully utilize the heat exchange effect. Compared with vertical and V type placement, the horizontal design can more efficiently utilize the entire exchange surface, significantly improve the heat exchange efficiency, especially in low temperature environment, the heat exchange effect is particularly prominent. In addition, the horizontal design has another advantage, that is, due to the influence of gravity, the condensed water and frost water can quickly flow away from the heat exchanger during defrosting, avoiding water accumulation and preventing icing phenomenon, improving the stability and reliability of the equipment.

[0023] 3. The defrosting and cleaning function is designed, the negative pressure wind direction generated by the evaporator during evaporation is changed to positive pressure wind direction by reversing the operation of the fan. The positive pressure wind direction can not only effectively blow away the water on the surface of the evaporator, but also can remove the residual water after defrosting, clean the exchange body of the heat exchanger. This function greatly reduces the frosting period and shortens the defrosting time, thereby increasing the heat exchange time of the equipment and improving the heat output. In addition, the design of the reverse fan also helps to reduce the heat exchange efficiency caused by frosting, and ensures the continuous and efficient operation of the equipment.

[0024] 4. The flow around plate design improves the heat exchange efficiency: in order to further improve the heat exchange efficiency in low temperature environment, the utility model adopts the flow around plate design. The flow around plate can effectively adjust the airflow direction, increase the airflow speed and air volume, thereby improving the wind speed and air volume entering the heat exchanger. In low temperature environment, the heat of airflow is low, and the heat exchange efficiency is often poor. Through the action of the flow around plate, the increase of airflow speed significantly improves the heat absorption of the heat exchanger, so that the low temperature airflow can complete heat exchange more efficiently. The flow around plate also has another important function, that is, it can quickly remove the water on the surface of the heat exchanger and the ice water generated during defrosting, reduce the water retention in low temperature environment, prevent water accumulation and icing, and avoid the situation that the heat exchanger is blocked by a large area of ice.

[0025] 5. Double enthalpy increasing device, ensures the safe operation of the compressor in low temperature environment: in the traditional system, the enthalpy increasing device mainly relies on the economizer to improve the heat efficiency of the compressor. However, the effect of the economizer in ultra low temperature environment is limited, which cannot effectively solve the problem of high exhaust temperature of the compressor in low temperature environment, resulting in easy damage of the compressor. The utility model innovatively adopts double enthalpy increasing device, cancels the traditional economizer, and replaces it with double enthalpy increasing device. The principle of the device is the same as that of the traditional enthalpy increasing principle, but the condensation exchanger in the double enthalpy gas-liquid separator is used to increase the enthalpy of the refrigerant, so as to reduce the exhaust temperature of the compressor and ensure the normal operation of the compressor in low temperature environment. In ultra low temperature environment, the refrigerant of the system adjusts the temperature through the enthalpy increasing device, ensures that the compressor will not be affected by the high exhaust temperature, avoids the damage of the compressor, and effectively prolongs the service life of the equipment.

[0026] 6. The magnetic heating is used for heating the gas-liquid separator, and prevents liquid strike from damaging the compressor: The utility model discloses an innovative electromagnetic heating system for heating the shell of the double-increment-enthalpy gas-liquid separator. In the low-temperature environment, most of the refrigerant sucked by the compressor is liquid after the liquid refrigerant enters the gas-liquid separator, which can easily cause liquid strike and damage the compressor. The shell of the gas-liquid separator is heated by the electromagnetic coil, the electromagnetic energy is used to heat the refrigerant, the refrigerant is vaporized into gas, and the compressor is sucked, which avoids the damage of the liquid strike to the compressor. This design not only ensures the safe operation of the compressor, but also further improves the heat efficiency of the system by reducing the exhaust temperature of the compressor, and ensures that the system can normally and efficiently operate in the ultra-low-temperature environment. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the structure assembly effect drawing of the utility model.

[0028] Figure 2 It is the structure exploded view of the utility model.

[0029] Figure 3 It is the structure principle diagram of the utility model.

[0030] Figure 4 It is the structure schematic diagram of the double-increment-enthalpy gas-liquid separator in the utility model. DETAILED DESCRIPTION

[0031] The utility model will be further explained in detail in combination with the drawings. A double-increment-enthalpy air energy ultra-low-temperature heating and hot water system device, which comprises:

[0032] The jet-increment-enthalpy compressor 1, the plate heat exchanger 2, the evaporator 3, the main expansion valve 4, the double-increment-enthalpy gas-liquid separator 5, the auxiliary expansion valve 6, the condensing exchanger 7 and the rack 11 are connected.

[0033] The exhaust port of the jet-increment-enthalpy compressor 1 is connected with the air inlet end of the plate heat exchanger 2 through the four-way valve 12, the outlet of the plate heat exchanger 2 is connected with the inlet of the evaporator 3 through the main expansion valve 4, the outlet of the evaporator 3 is connected with the inlet of the double-increment-enthalpy gas-liquid separator 5, and the outlet of the double-increment-enthalpy gas-liquid separator 5 is connected with the air return port of the jet-increment-enthalpy compressor 1.

[0034] The outlet of the plate heat exchanger 2 is connected with the inlet of the condensing exchanger 7 arranged in the double-increment-enthalpy gas-liquid separator 5 through the auxiliary expansion valve 6, and the outlet of the condensing exchanger 7 is connected with the air supplement port of the jet-increment-enthalpy compressor 1.

[0035] The shell of the double-increment-enthalpy gas-liquid separator 5 is covered with the electromagnetic coil 8, and the electromagnetic coil 8 is connected with the main control system.

[0036] The evaporator 3 adopts horizontal placement structure, the bottom is the air inlet face, the air inlet face is provided with the spoiler 9, the top of the evaporator 3 is provided with the reversible fan 10, the fan 10 is connected with the control system.

[0037] In one embodiment: the plate heat exchanger 2 and the auxiliary expansion valve 6 are connected in series with the first electromagnetic valve 13.

[0038] In one embodiment: the condensing exchanger 7 is the coil pipe that is spirally coiled in the double enthalpy gas-liquid separator 5.

[0039] In one embodiment: the shell of the double enthalpy gas-liquid separator 5 is made of ferromagnetic material, and the electromagnetic coil 8 is spirally coiled on the shell.

[0040] In one embodiment: the electromagnetic coil 8 and the shell of the double enthalpy gas-liquid separator 5 are provided with the glass fiber isolation layer 14.

[0041] In one embodiment: the spoiler 9 is in the shape of "eight" distributed with middle high and both sides low.

[0042] In one embodiment: the evaporator 3 is horizontally installed in the middle of the rack, the fan 10 is located at the top of the rack 11, the spoiler 9 is located at the bottom of the evaporator 3, the airflow enters through the guide plate from both sides, vertically upwards into the evaporator, and finally discharged upwards through the fan 10.

[0043] Working principle: the double enthalpy air energy ultra-low temperature heating hot water system equipment can realize stable and efficient operation of the system in the ultra-low temperature environment, and solves the problems of insufficient heat exchange and compressor damage of the traditional system in low temperature working. The working principle of the system is mainly carried out through the following steps, and through the design of the flat evaporator, defrosting and cleaning function, flow plate, double enthalpy device, the performance of the equipment is significantly improved.

[0044] Specific work: the high-temperature mixed gas discharged by the jet enthalpy compressor 1 first enters the plate heat exchanger 2, and is subjected to condensation treatment. Most of the refrigerant is condensed in the plate heat exchanger, enters the evaporator 3 through the main expansion valve 4, and is converted into low-temperature mixed gas through heat exchange in the evaporator. Then, the low-temperature mixed gas flows to the double enthalpy gas-liquid separator 5, and the refrigerant is further separated in the gas-liquid separator, and the gaseous refrigerant is separated out, and the liquid refrigerant remains in the separator.

[0045] In addition, the part of the refrigerant condensed in the plate heat exchanger enters the condensing exchanger in the double-increment-enthalpy gas-liquid separator 5 through the auxiliary expansion valve 6, and the condensing exchanger is a coil pipe arranged in the gas-liquid separator. The coil pipe heats the liquid refrigerant in the separator to make it gasify and re-enter the compressor, thereby preventing the liquid strike of the compressor. At the same time, the condensing exchanger is connected to the air injection increment-enthalpy compressor to automatically provide different amounts of low-temperature gas to the middle cylinder of the compressor according to the temperature change of the compressor, so as to mix with the high exhaust gas temperature of the compressor to reduce the exhaust gas temperature of the compressor and ensure the operation of the compressor within the rated temperature range.

[0046] Through the process, the system can ensure that the compressor always inhales gaseous refrigerant, avoiding the liquid strike phenomenon caused by the liquid refrigerant entering the compressor, and protecting the compressor from damage. At the same time, the increment-enthalpy design helps to effectively reduce the exhaust gas temperature of the compressor, ensuring the stable operation of the compressor and avoiding the failure caused by high exhaust gas temperature.

[0047] In the case of extremely low temperature, an electromagnetic heating coil is further arranged outside the double-increment-enthalpy gas-liquid separator. After the exhaust gas of the air injection increment-enthalpy compressor enters the plate heat exchanger for preliminary condensation, most of the refrigerant enters the evaporator for heat exchange through the main expansion valve, forming low-temperature mixed gas, and finally flowing to the double-increment-enthalpy gas-liquid separator. At this time, the shell of the double-increment-enthalpy gas-liquid separator is heated by the electromagnetic heating coil, so that the refrigerant can gasify at this place for the compressor to inhale.

[0048] Compared with the traditional economizer increment-enthalpy system, the double-increment-enthalpy device of the utility model can operate normally in an ultra-low temperature environment, effectively avoids the liquid strike phenomenon caused by the liquid refrigerant entering the compressor by reasonably controlling the gasification process of the refrigerant, and ensures the safety of the compressor. In addition, the electromagnetic heating device helps the refrigerant to gasify and ensures the operation of the compressor within the normal temperature range, avoiding damage to the compressor due to excessively high exhaust gas temperature.

[0049] Further, unlike the traditional vertical or V-shaped placement of the evaporator, the evaporator 3 in the utility model adopts a horizontal placement design. This design can make the heat exchange surface of the evaporator fully exchange, improving the heat exchange efficiency. Unlike the vertical or V-shaped placement method, which only has about 70% of the heat exchange area in action, the horizontal placement design ensures that 100% of the heat exchange area can effectively participate in heat exchange, significantly improving the heat exchange efficiency.

[0050] The horizontal placement design of the evaporator can make the refrigerant evenly distributed, avoiding the problem of limited heat exchange efficiency. In addition, another advantage of the horizontal placement design is that during the defrosting process, the condensed water and frost water can quickly flow out of the heat exchanger relying on gravity, preventing water accumulation and effectively reducing the icing phenomenon, ensuring the stable operation of the equipment.

[0051] Further, the defrosting and cleaning function is provided in the case. When the system is working, if frost is formed on the surface of the evaporator, the heat exchange efficiency will be reduced. Therefore, the defrosting and cleaning function is designed. When the system enters the defrosting period, the fan 10 will operate reversely. By reversing the fan, the direction of the wind is changed. The positive pressure wind will be used to blow away the water on the surface of the evaporator which is not completely removed, and clean the heat exchange surface of the evaporator.

[0052] In this process, the wind pressure helps to quickly melt the ice condensed on the evaporator, and the water after defrosting is removed by the action of the wind, thereby shortening the defrosting time and prolonging the frosting period. Through this function, the system can maintain longer heat exchange time and improve the overall heat output. Through the defrosting and cleaning function, the system can effectively reduce the influence of frost on the heat exchange efficiency and prolong the working period of the equipment. The fan reversing function can quickly remove the water and ice on the evaporator, and ensure the efficient operation of the system in low temperature environment.

[0053] Further, in order to improve the heat exchange efficiency in low temperature environment, the spoiler 9 is designed. The spoiler can effectively change the direction of airflow, so that the airflow velocity is increased, and then the airflow through the heat exchanger is increased. Through this effect, the airflow velocity and air volume in the heat exchanger are improved, thereby enhancing the heat exchange effect.

[0054] Especially in low temperature environment, the heat of airflow is low, and the slow airflow will cause the heat energy entering the heat exchanger to be reduced, thereby affecting the heat exchange efficiency. Through the design of the spoiler, the airflow velocity is increased, and the heat exchange rate is correspondingly improved, and the heat exchange efficiency of the system is effectively improved. Another effect of the spoiler is that it can help to quickly remove the water on the heat exchanger and the ice water flowing down during defrosting, reduce the risk of water retention and icing in low temperature environment, and prevent the heat exchanger from being blocked by ice.

[0055] Therefore, the spoiler not only improves the heat exchange rate, but also improves the heat exchange efficiency of low temperature airflow, and ensures that the system can still operate efficiently in low temperature environment. Through the design of the spoiler, the ice blocking phenomenon is avoided, and the stability of the equipment is effectively improved.

[0056] In summary, the working principle of the utility model combines multiple innovative designs. Through the technical means such as placing the evaporator horizontally, the spoiler, the defrosting and cleaning function and the double enthalpy increasing device, the problems of the traditional low temperature heating system in extremely low temperature environment are effectively solved. The system can efficiently utilize the heat exchange surface, improve the heat exchange efficiency, ensure the safe operation of the compressor, and maintain high energy efficiency in super low temperature environment. A reliable, stable and efficient solution is provided for low temperature heating.

[0057] Obviously, the above embodiments are only examples for clearly illustrating the present application and are not intended to limit the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments are not required to be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the claims of the present application.

Claims

1. A dual enthalpy-increasing air energy ultra-low temperature heating and hot water system device, characterized in that, The utility model relates to a kind of refrigeration system, including: jet augmenting compressor (1), plate heat exchanger (2), evaporator (3), main expansion valve (4), double augmenting gas-liquid separator (5), auxiliary expansion valve (6), condensing exchanger (7), rack (11);Wherein, the exhaust port of the jet augmenting compressor (1) is connected with the gas inlet end of plate heat exchanger (2) by four-way valve (12), the outlet of the plate heat exchanger (2) is connected with the inlet of evaporator (3) by main expansion valve (4), the outlet of the evaporator (3) is connected with the inlet of double augmenting gas-liquid separator (5), and the outlet of double augmenting gas-liquid separator (5) is connected with the air inlet of jet augmenting compressor (1);The outlet of the plate heat exchanger (2) is connected with the inlet of condensing exchanger (7) arranged in double augmenting gas-liquid separator (5) by auxiliary expansion valve (6), and the outlet of the condensing exchanger (7) is connected with the air inlet of jet augmenting compressor (1);The shell of the double augmenting gas-liquid separator (5) is covered with electromagnetic coil (8), and electromagnetic coil (8) is connected with main control system. The evaporator (3) adopts horizontal placement structure, and the bottom is air inlet face, and spoiler (9) is arranged on the air inlet face, and the top of the evaporator (3) is matched with reversible fan (10), and fan (10) is connected with control system. First electromagnetic valve (13) is connected between the plate heat exchanger (2) and auxiliary expansion valve (6). The condensing exchanger (7) is coil pipe that is spirally coiled in double augmenting gas-liquid separator (5). The shell of the double augmenting gas-liquid separator (5) is made of ferromagnetic material, and electromagnetic coil (8) is spirally coiled on the shell. Glass fibre isolation layer (14) is arranged between the electromagnetic coil (8) and the shell of the double augmenting gas-liquid separator (5).

2. The dual enthalpy-increasing air energy ultra-low temperature heating and hot water system device according to claim 1, characterized in that: The spoiler (9) is distributed in "eight" shape with middle high and both sides low.

3. The dual enthalpy-increasing air energy ultra-low temperature heating and hot water system device according to claim 1, characterized in that: The evaporator (3) is horizontally installed in the middle of rack, and fan (10) is located on the top of rack (11), and spoiler (9) is located on the bottom of evaporator (3), airflow enters the guidance of guide plate from both sides, vertically upwards into evaporator, and finally is discharged upwards by fan (10).

4. The dual enthalpy-increasing air energy ultra-low temperature heating and hot water system device according to claim 1, characterized in that: ​ 5. The dual-enhalation air energy ultra-low temperature heating and hot water system device according to claim 4, characterized in that: ​ 6. The dual-enhalation air energy ultra-low temperature heating and hot water system device according to claim 1, characterized in that: ​ 7. The dual-enhalation air energy ultra-low temperature heating and hot water system device according to claim 1, characterized in that: ​

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