CN205747570U - Evaporating type condensing air conditioner heat pump system - Google Patents

Abstract

The utility model relates to an evaporative condensing air-conditioning heat pump system, which consists of a compressor, a four-way valve, a use-side heat exchanger, a finned tube heat exchanger, an evaporative condenser, a spraying water device, a liquid storage device, a dry filter device, throttling device, gas-liquid separator, fan, solenoid valve D, solenoid valve A, solenoid valve B, one-way valve, pipeline and control circuit. The finned tube heat exchanger and evaporative condenser are connected in series and parallel. The method is arranged at the condenser pipe end interface of the four-way valve, the inlet ends of the two branches are jointly connected to the condenser interface end of the four-way valve, and the outlet ends of the two are jointly connected to the inlet pipeline of the liquid receiver; refrigeration and The heating function relies on the four-way valve to switch the suction and exhaust flow direction of the compressor, and the flow direction is controlled again by the solenoid valve and the one-way valve, so that the cooling operation can quickly cool the refrigerant through the latent heat of water evaporation in the evaporative condensation function system to achieve refrigeration. High-efficiency and energy-saving operation; when heating, rely on the finned tube heat exchanger to absorb heat from the air side, so that the system has the function of air source heat pump.

Description

Evaporative condensing air conditioning heat pump system

technical field

The utility model belongs to the technical field of refrigeration and air-conditioning equipment, and mainly relates to an evaporative condensation air-conditioning heat pump system.

Background technique

Evaporative condensation technology is a highly efficient and water-saving technology. The circulating water is evenly distributed on the surface of the heat exchanger to form a continuous water film, and the heat of the fluid inside the heat exchanger absorbed by the latent heat of water evaporation is transferred to the air by using the driving force of the enthalpy difference of the unsaturated air. Compared with air-cooled cooling equipment, evaporative condenser equipment can save more than 30% of electricity; compared with traditional open cooling towers, its efficiency is equivalent to the integration of traditional water condensers and cooling towers, and the efficiency is higher , Effectively reduce the escape rate of circulating water. Evaporative condensation technology is widely used in closed cooling tower products. At present, the number of evaporative condenser products using refrigerant as the working medium is increasing day by day. The condenser is in the process of research and development. At present, products using evaporative condensation technology are basically used in refrigeration systems in the industrial field without heat pump functions. At the same time, because the application environment of evaporative condensers is high humidity and heat, the surface of the heat exchanger is prone to fouling, which has always troubled its promotion and application.

Air-source heat pump is a kind of air-conditioning equipment that does not need to install a machine room, does not need cooling water, uses air as a heat source, and can be used for heating and cooling. Because air can be obtained and used anytime and anywhere, it is easy to install and use. Air-source heat pumps have gained popularity in the field of comfort air conditioning widely used. The disadvantage is that the specific heat capacity of the air is small, the efficiency of the air-side heat exchanger is low, and the equipment needs a large amount of ventilation and a large heat transfer temperature difference to meet the use requirements. Therefore, during cooling operation, the condensation temperature of the air source heat pump is higher than that of the water-cooled unit. About 10°C, which is more than 13°C higher than evaporative cooling, resulting in low energy efficiency of the refrigeration system. Therefore, it is necessary to complement the advantages of evaporative condensation technology and air source heat pump technology to better meet the energy-saving requirements of products in the field of comfort air conditioning.

Utility model content

The purpose of this utility model is to overcome the problems existing in the above-mentioned prior art, and provide an evaporative condensing air-conditioning heat pump system, which can realize high-efficiency evaporative cooling technology grafted into air source heat pump products, and achieve high cooling operation efficiency and low cost. Reasonable, easy to produce, reliable in application, and quite valuable in implementation.

The purpose of this utility model is accomplished through the following technical solutions. This evaporative condensing air-conditioning heat pump system consists of a compressor, a four-way valve, a use-side heat exchanger, a finned tube heat exchanger, an evaporative condenser, a spray water device, a liquid reservoir, a dry filter, and a throttle Device, gas-liquid separator, fan, solenoid valve D, solenoid valve A, solenoid valve B, one-way valve, pipeline and control circuit, finned tube heat exchanger and evaporative condenser are arranged in four The condenser pipe end interface of the one-way valve, the inlet end of the branch where the two are located are connected to the condenser interface end of the four-way valve, and the outlet end of the two is connected to the inlet pipeline of the liquid receiver; the cooling and heating functions depend on The four-way valve switches the suction and exhaust flow direction of the compressor, and the solenoid valve and the one-way valve control the flow direction again, so that the cooling operation can quickly cool the refrigerant through the latent heat of water evaporation of the evaporative condensation function system, and realize efficient and energy-saving cooling operation; When heating, rely on the finned tube heat exchanger to absorb heat from the air side, so that the system has the function of air source heat pump.

The finned tube heat exchanger is an air-cooled condenser, and the evaporative condenser is a wind-water cooling condenser based on the latent heat of water evaporation. The refrigerant is adjusted by adjusting the four-way valve and the solenoid valve through the control circuit The flow direction depends on the independent, series and parallel operation modes of the evaporative condenser 5 and the finned tube heat exchanger, so that the system can achieve high-efficiency operation during cooling, and at the same time have the function of an air source heat pump to realize the organic combination of the two.

The evaporative condenser and the spray water device are integrated in the air-cooled module casing. The spray water device includes a circulating water pump, a nozzle, a sump and a float valve, and a sump is provided at the bottom of the air-cooled module casing. , the sump is connected with the nozzle of the upper water distributor through the circulating water pump, and the water intake is controlled through the float valve; the nozzle is facing the evaporative condenser, and a fan is installed on the top of the air-cooled module casing, and the evaporative condensation is eliminated by the fan The high-humidity hot air formed when the unit cools down in the cooling operation; in the heating operation, relying on the fan to drive the air to flow through the finned tube heat exchanger, so that the unit refrigerant obtains heat from the low-temperature air heat source.

The heat exchange unit branch connected to the evaporative condenser consists of an evaporative condenser, a solenoid valve B, and a one-way valve A, and the heat exchange unit branch B connected to the finned tube heat exchanger includes a finned tube heat exchanger , solenoid valve A, one-way valve E, and the two branches are connected through solenoid valve D.

The beneficial effects of the utility model are:

1. Compared with the traditional air source heat pump unit, the energy efficiency of cooling operation can be greatly improved, which can be increased by more than 30%.

2. Compared with the traditional chiller + cooling tower application, not only is the energy efficiency better, but the integrated design ensures that the delivered product is of good quality, beautiful, and occupies a small area, effectively reducing the project cost.

3. Compared with the single cooling function of the chiller, the heating mode is added to broaden the scope of application.

4. During the cooling operation, the independent operation, series operation, and parallel operation mode of the evaporative condenser and the air-cooled finned tube heat exchanger are set to ensure that the system can operate efficiently and reliably under various working conditions, which can effectively reduce the evaporative condensation. Risk of fouling on heat exchanger surfaces.

5. The system is flexible in design, has good scalability, and can adapt to different application environments.

Description of drawings

Fig. 1 is a flow chart of an evaporative condensing air-conditioning heat pump system;

Fig. 2 is a flow chart of an air-cooled hot and cold water heat pump system with evaporation;

Figure 3 The evaporative condenser is connected in series with the finned tube heat exchanger;

Figure 4 The evaporative condenser is connected in parallel with the finned tube heat exchanger;

Fig. 5 The evaporative condenser and the finned tube heat exchanger are connected in series and parallel 1;

Fig. 6 The evaporative condenser and the finned tube heat exchanger are connected in series and parallel 2;

Fig. 7 is a schematic diagram of the auxiliary control loop of the heat pump system.

Explanation of reference signs: 1-compressor; 2-four-way valve; 3-use side heat exchanger; 4-finned tube heat exchanger; 5-evaporative condenser; 6-spray water device; 7-storage Liquid device; 8-dry filter; 9-throttling device; 10-gas-liquid separator; 11-fan; 12-solenoid valve D; 13-solenoid valve A; 14-solenoid valve B; 15-one-way valve A , 16-one-way valve B, 17-one-way valve C, 18-one-way valve D, 19-one-way valve E; 20-solenoid valve C; 21-water collection tank, 22-floating ball valve, 23-circulating water pump, 24 - Nozzle.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described further:

This evaporative condensing air-conditioning heat pump system is characterized in that it consists of a compressor 1, a four-way valve 2, a use-side heat exchanger 3, a finned tube heat exchanger 4, an evaporative condenser 5, a spray water device 6, Liquid reservoir 7, dry filter 8, throttling device 9, gas-liquid separator 10, fan 11, solenoid valve D12, solenoid valve A13, solenoid valve B14, one-way valve, pipeline and control circuit, finned tube The heat exchanger 4 and the evaporative condenser 5 are arranged in series and parallel, and are connected to the condenser pipe end of the four-way valve 2. The outlet end of the other is connected to the inlet pipeline of the liquid receiver 7; the cooling and heating functions rely on the four-way valve 2 to switch the suction and exhaust flow direction of the compressor 1, and the flow direction is controlled again by the solenoid valve and the one-way valve, so that the refrigeration In operation, the latent heat of evaporation of water in the evaporative condensation function system can be used to quickly cool the refrigerant, so as to realize high-efficiency and energy-saving cooling operation; when heating, rely on the finned tube heat exchanger 4 to absorb heat from the air side, so that the system has the function of an air source heat pump. The finned tube heat exchanger 4 is an air-cooled condenser, and the evaporative condenser 5 is a wind-water cooling condenser based on the latent heat of water evaporation. Adjust the refrigerant flow direction, rely on the evaporative condenser 5 and the finned tube heat exchanger 4 independent, series, and parallel operation modes to enable the system to achieve efficient operation during cooling, and at the same time have the function of an air source heat pump to achieve an organic combination of the two.

In this scheme, the finned tube heat exchanger 4 and the evaporative condenser 5 are used as heat source side heat exchangers, both of which can be used as condensers during cooling operation, and can be operated independently or jointly. In the heat pump system, the positions can be connected in series Row arrangement, parallel connection or free combination of serial and parallel designs, see Figures 3, 4, 5, and 6. In the evaporative condenser system, fouling is an unavoidable problem. Using air-cooled finned tube heat exchangers as pre-cooling is a very effective measure to reduce fouling. For this application, arrange the fins in series. The pre-cooling function can be realized by placing the tube heat exchanger in front of the evaporative condenser. In view of the fact that the evaporative condensation efficiency is much higher than that of air cooling, the best cooling operation mode is that the evaporative condenser operates independently, while the heating mode is that the finned tube heat exchanger works alone, parallel connection can achieve this purpose, and the pipeline The layout is simple. If in a system both the evaporative condenser is required to operate independently and the finned tube heat exchanger is integrated to operate together, the series-parallel free combination design is adopted, and the system can be operated efficiently and reliably through reasonable control. Through this novel series-parallel free combination design, when the refrigeration operation is high-temperature and high-load and easy to accumulate fouling, the finned tube heat exchanger is put into the pre-cooling section, and the temperature of the refrigerant entering the evaporative condenser can be significantly reduced and the fouling The risk is greatly reduced. When the evaporative condenser system fails or needs to be repaired, it can be temporarily switched to the finned tube heat exchanger to undertake the condensation function without affecting the use of the unit. When the effect of evaporative condensation drops significantly during cooling operation, finned tube heat exchangers can be used to participate in cooling to increase the heat dissipation capacity of the system and make up for the deficiency of evaporative condensation. It can be seen that this design ensures efficient cooling operation and improves the safety redundancy of system operation. This kind of series and parallel free combination design has two schemes as shown in Figure 5 and Figure 6. Arrangement 2 is compared with Arrangement 1. An electromagnetic valve C20 is added before the inlet of the finned tube heat exchanger, which can ensure that the refrigerant is completely cut off when the refrigeration evaporative condenser operates independently. It is sent to the finned tube heat exchanger, but the additional system pressure drop due to the existence of the solenoid valve C20 will sacrifice performance during heating operation, and arrangement 1 is preferred in this scheme.

In this solution, the branch A connected to the evaporative condenser 5 is composed of the evaporative condenser 5, the solenoid valve B14, and the one-way valve A15. During cooling operation, the solenoid valve A14 is in a fully open state, and the branch circuit is unblocked, and all exhaust gas from the compressor enters the evaporative condenser 5 for heat exchange with wind and water. During the heating operation, the branch A needs to be cut off to isolate the evaporative condenser 5 from the running heat pump cycle, and the electromagnetic valve and the one-way valve work together to close this channel.

In this solution, the branch B connected to the finned tube heat exchanger 4 is composed of the finned tube heat exchanger 4, the solenoid valve A13, and the one-way valve E19. During cooling operation, the solenoid valve 13 is in a closed state, the branch circuit is cut off, and the internal pressure of the branch circuit is equivalent to the refrigerant saturation pressure corresponding to the outdoor ambient temperature. During the heating operation, the solenoid valve A13 is opened, and the finned tube heat exchanger 4 is used as an air source heat pump evaporator, and the low-temperature gas-liquid two-phase refrigerant generated after throttling by the throttling device 9 flows through the finned tube heat exchanger 4. It absorbs heat from the air and evaporates.

In this solution, the solenoid valve D12 connects the branch A connected with the evaporative condenser 5 and the branch B connected with the finned tube heat exchanger 4 . In the cooling operation, the electromagnetic valve D12 can be closed when the evaporative condenser 5 operates independently; when the evaporative condenser 5 and the finned tube heat exchanger 4 are in combined cooling operation, the electromagnetic valve D12 can be opened. During heating operation, close solenoid valve D12 and cut off branch A.

In this scheme, the cooling and heating functions rely on the four-way valve 2 to switch the suction and exhaust flow direction of the compressor 1, and then further control the flow direction of the refrigerant by the solenoid valve and the one-way valve, so that when the cooling is running, the compressor exhaust It leads to the evaporative condenser 5, and uses the latent heat of evaporation of the spray water generated by the spray water device 6 to quickly cool the refrigerant to realize high-efficiency and energy-saving operation of refrigeration; when heating, the exhaust gas of the compressor leads to the heat exchanger 3 on the use side , the heat of condensation is transferred to the fluid on the use side to achieve the heating function. As the evaporator of the heating cycle, the finned tube heat exchanger 4 continuously absorbs heat from the air side, thereby enabling the system to have the function of an air source heat pump.

In this scheme, the high humidity and hot air formed by the evaporative condenser 5 during the cooling operation needs to be discharged by the fan 11; the finned tube heat exchanger 4 is used as the evaporator of the air source heat pump during the heating operation. The fan 11 draws the air in the external environment to flow through the finned tube heat exchanger, so that the refrigerant in the heat exchanger and the air can exchange heat effectively.

As a further solution of this scheme, a complete set of evaporative condensation function system is integrated. The evaporative condenser 5 acts as a condensation radiator, and the spray water device 6 serves as a water source for evaporative cooling. The spray water is evenly sprinkled on the heat exchange surface of the partition wall of the evaporative condenser 5, and the forced convection air generated by the fan 11 also passes through the heat exchange surface of the partition wall, thereby forming air-water flow heat exchange. The evaporative condenser 5 and the spray water device 6 are integrated in the air-cooled module machine casing. The spray water device includes a circulating water pump 23, a nozzle 24, a sump 21 and a ball float valve 22. In the air-cooled module machine There is a sump 21 at the bottom of the shell, and the sump 21 is connected with the nozzle 24 of the upper water distributor through the circulating water pump 23, and the water intake is controlled through the float valve 22; the nozzle 24 is facing the evaporative condenser 5, and the air-cooled module casing There is a fan 11 on the top of the fan, and the fan 11 is used to remove the high-humidity and hot air formed by the evaporative condenser 5 during the cooling operation; during the heating operation, the fan 11 is used to drive the air to flow through the finned tube heat exchanger 4, so that The unit refrigerant gains heat from a low temperature air heat source. The fan 11 can be adjusted at variable speeds to optimize the operation of the cooling and heating systems.

As a further solution of this scheme, the air volume passing through the evaporative condenser 5 during cooling may be different from the air volume flowing through the finned tube heat exchanger 4 during heating, so the fan 11 can be adjusted at variable speed, or when it is configured as multiple groups of fans Change the air volume according to the change of input quantity. The above measures can optimize the matching of cooling and heating system operation.

As a further solution of this scheme, the refrigerant flow direction is controlled by adjusting the operating status of the compressor, four-way valve, solenoid valve, fan, throttling device, and water pump through the system controller circuit, and the refrigerant circulation flow, air flow, and spray water volume are adjusted. To achieve system cooling, rely on a variety of operating modes to ensure efficient and reliable operation, and play the energy-saving role of air source heat pumps in heating, and realize the organic combination of the two.

As a further solution of this scheme, through reasonable pipeline design and optimized control logic, the number of solenoid valves can be reduced and the system design cost can be reduced. If the solenoid valve located in the high temperature zone is removed, the operational reliability can be further improved.

The implementation shown in Figure 1 adopts a heat pump unit system flow in which the evaporative condenser and the finned tube heat exchanger are arranged in series and parallel. 4 and solenoid valve D12, solenoid valve A13, solenoid valve B14, one-way valve A15, one-way valve E19 to form a heat exchange unit branch A with the evaporative condenser 5 as the core, and the finned tube heat exchanger 4 As the core of the heat exchange unit branch B, the flow direction of the refrigerant is controlled by the solenoid valve to achieve the function of freely switching the heat exchange unit. Heat exchange unit branch A is composed of evaporative condenser 5, solenoid valve B14, and one-way valve A15, and heat exchange unit branch B is composed of finned tube heat exchanger 4, solenoid valve A13, and one-way valve E19. Both the inlets of branch A and branch B are connected to the condenser port C of the four-way valve 2, and the high-temperature and high-pressure exhaust gas can be selectively introduced into the inlets of branch A and branch B during cooling operation. The outlets of branch A and branch B are connected to the inlet of liquid reservoir 7 . The evaporative condenser 5 and the finned tube heat exchanger 4 are connected through the electromagnetic valve D12, which controls joint operation or independent operation.

In the evaporative condenser functional system, the evaporative condenser 5 can be a serpentine coil structure with high pressure resistance and is more suitable for refrigerants; plate-plate heat exchangers can also be used, which are easy to clean and require less refrigerant charging , it is necessary to test the withstand voltage capacity to meet the standard. The water in the sump is pumped into water treatment equipment such as an electronic descaling instrument, and then sent to the water distributor located on the upper part of the evaporative condenser 5, and the water is evenly sprayed on the evaporative condenser 5 through the nozzle 24. On the hot surface, the air sucked by the fan 11 and the spray water pass through the partition wall heat exchange surface in a countercurrent manner, forming mass and heat transfer between air and water, relying on the flow enthalpy difference of the unsaturated air as the driving force, the water continuously evaporates and absorbs Heat is quickly carried away by the passing air. As the water evaporates and dissipates with a very small amount of loss, the water level in the pool drops, and the water is replenished in time under the action of the float valve to ensure the safe suction of the water level by the water pump. After long-term operation, the concentration of minerals in the pool will increase, requiring regular sewage discharge.

According to the flow direction of cooling operation shown in Figure 1, the use side heat exchanger 3 is connected to the evaporator side channel E of the four-way valve 2, and the low-pressure steam enters the suction port of the compressor after being separated into gas and liquid by the gas-liquid separator 10. After the compressor 1 does work, the formed high-temperature and high-pressure gas is introduced into the side channel C of the condenser through the four-way valve 2, and then enters different heat exchanger unit branches for cooling according to the on-off status of each solenoid valve. When only the evaporative condenser 5 is running, the solenoid valve D12 and the solenoid valve A13 are closed, the solenoid valve B14 is opened, and the exhaust gas enters the heat exchange unit branch A, and is cooled efficiently by the evaporative condenser 5 . When the finned tube heat exchanger 4 is used as pre-cooling, the finned tube heat exchanger 4 and the evaporative condenser 5 adopt a series operation mode, the solenoid valve B14 and the solenoid valve A13 are closed, the solenoid valve D12 is opened, and the exhaust gas first enters the condenser. The thermal unit branch B is dry-cooled by air in the finned tube heat exchanger 4, which can reduce the exhaust gas above 70°C to a two-phase mixture below 48°C, and then introduce it in series through the D12 channel of the solenoid valve. Secondary cooling is performed in the layout of the evaporative condenser 5, because the liquid inlet temperature is less than 55°C, which greatly reduces the chance of fouling on the heat exchange surface. The evaporative condensing unit needs to be regularly descaled and decontaminated to prevent clogging. If the control circuit detects that the condensing temperature of the system is high during operation, that is, when the evaporative cooling effect is poor, the controller will enter the parallel joint operation mode, and the solenoid valve B14 will remain open. D12 remains closed, the solenoid valve A13 is opened, and the exhaust gas is diverted into the finned tube heat exchanger 4 for dry cooling, which reduces the cooling load of the evaporative condenser 5, enhances the condensation capacity, and effectively improves the cooling operation of the entire unit efficiency.

During the heating operation, only the heat exchange unit branch B where the finned tube heat exchanger 4 is located participates in the operation, while the system where the evaporative condenser 5 is located is out of operation, that is, the water pump does not work, and the solenoid valve B14 and solenoid valve D12 are closed. Heat exchange unit branch A is isolated. Under the flow direction switching of the four-way valve 2, the exhaust gas from the compressor is introduced into the use-side heat exchanger 3 for exothermic cooling. After cooling, the refrigerant enters the liquid receiver 7 through the one-way valve C17, and enters the throttling through the dry filter 8. Device 9, the low-temperature and low-pressure two-phase refrigerant formed after throttling enters the finned tube heat exchanger 4 to absorb heat and evaporate into superheated steam through the check valve D18, and then passes through the four-way valve 2 and the gas-liquid separator 10 Return to compressor 2 suction port. The frost accumulated on the finned tube heat exchanger is defrosted by the reverse refrigeration cycle, and it is treated according to the independent cooling operation mode of the finned tube heat exchanger, that is, the solenoid valve D12 and the solenoid valve B14 can be closed, the solenoid valve A13 is opened, and the compressor is exhausted. Enter the finned tube heat exchanger to defrost.

Figure 2 shows the flow of an air-cooled hot and cold water heat pump system with evaporative condensation, which is an example of simplified application in small units. The system consists of scroll compressor 1, electromagnetic four-way reversing valve 2, brazed plate heat exchanger, finned tube heat exchanger 4, copper tube cluster evaporative condenser 5, spray water device 6, liquid storage 7. Dry filter 8, throttling device 9 (electronic expansion valve), gas-liquid separator 10, axial fan 11, solenoid valve A13, solenoid valve B14, check valve and control circuit. The finned tube heat exchanger 4 is made of copper tubes with aluminum fins, and the evaporative condenser 5 is a serpentine copper tube bundle array. Conventional use of large-diameter heat exchangers such as Φ9.52 and Φ15.88 is small, and the refrigerant filling volume is small. In this way, the parallel design scheme of evaporative condenser 5 and finned tube heat exchanger 4 can be adjusted appropriately, and the solenoid valve can be removed. D12, the design position of the solenoid valve B14 is transferred from the original high-temperature exhaust pipeline to the liquid pipeline during cooling operation, and the working life of the solenoid valve is correspondingly improved. Heat exchange unit branch A is composed of evaporative condenser 5, solenoid valve B14, and one-way valve A15, and heat exchange unit branch B is composed of finned tube heat exchanger 4, solenoid valve A13, and one-way valve E19. Both the inlets of branch A and branch B are connected to the condenser port C of the four-way valve 2 , and the outlets of branch A and branch B are connected to the inlet of liquid reservoir 7 . The pipeline design at the inlet connection point of branch A and branch B is arranged according to the direction of heating flow. When heating, the solenoid valve B14 where branch A is located is closed, so that the branch is not smooth, and the flow from the finned tube heat exchanger 4. The oily refrigerant coming out flows through the confluence point of the two branches along the straight-through pipeline with the smallest pressure drop. Branch A is designed with an ascending pipe section at the connection point to avoid refrigerated oil retention and ensure that the refrigerated oil returns to the compressor normally.

In the independent cooling operation mode of the evaporative condenser 5, the solenoid valve B14 is opened, the solenoid valve A13 is closed, and the refrigerant enters the evaporative condenser for cooling. Because the branch circuit of the finned tube heat exchanger is cut off, a small amount of refrigerant will be cooled naturally in it. During the operation, the electromagnetic valve A13 can be controlled to open intermittently. During combined refrigeration operation, the solenoid valve B14 and solenoid valve A13 are both open, and the two heat exchanger units participate in cooling at the same time, sharing the condensation load. During refrigeration operation, the liquid receiver 7 is used to separate a very small amount of saturated gas that may occur during operation, so as to ensure the stability of the throttling operation of the electronic expansion valve.

When the finned tube heat exchanger needs to be defrosted in heating operation, it is carried out in the reverse cycle of cooling, the solenoid valve B14 is closed, the solenoid valve A13 is opened, the fan 11 is closed, and the compressor exhaust mainly enters the finned tube heat exchanger to defrost. In the defrosting process of less than 10 minutes, although the 5 branches of the evaporative condenser are blocked, due to the natural temperature difference between the hot gas and the inner flow channel of the copper tube bundle, a small amount of hot gas migrates into the cooling. When the unit has gone through multiple defrosting, There may be some refrigerating oil accumulated therein. At this time, it is necessary to set the flushing program of refrigerant and oil in the controller so that too much refrigerating oil does not accumulate in the evaporative condenser 5 .

The evaporative condenser 5 is not designed with redundant heat exchange tubes to cool the spray water, so fillers are set in the spray water device 6 to cool the spray water to ensure the effect of evaporation and condensation. The fan 11 adopts a two-speed fan design, and the exhaust air volume is controlled according to the value collected by the exhaust pressure sensor in the control circuit shown in Figure 7, and the electronic expansion valve performs cooling according to the suction superheat obtained by the suction pressure and suction temperature sensor Agent flow control, thus ensuring efficient and stable operation of the unit.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only includes an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (4)

1. an evaporating type condensing air conditioner heat pump system, it is characterized in that: by compressor (1), cross valve (2), use side heat exchanger (3), finned tube exchanger (4), evaporative condenser (5), spray water system (6), liquid reservoir (7), device for drying and filtering (8), throttling arrangement (9), gas-liquid separator (10), blower fan (11), electromagnetic valve D (12), electromagnetic valve A (13), electromagnetic valve B (14), check valve and pipeline form with control loop, finned tube exchanger (4) and evaporative condenser (5) are arranged in the condenser tube end interface of cross valve (2) by series-parallel system, the entrance point of both place branch roads is commonly connected to the condenser interface end of cross valve (2), both are commonly connected in the inlet ductwork of liquid reservoir (7) by the port of export；Refrigeration and heat-production functions rely on the suction and discharge of cross valve (2) switching compressor (1) to flow to, and the flow direction is controlled again with check valve by electromagnetic valve, refrigerating operaton is made can quickly to cool down cold-producing medium by evaporating type condensing function system water evaporation latent heat, it is achieved refrigerated efficient energy-saving run；When heating, rely on finned tube exchanger (4) to absorb heat from air side, make system possess air source heat pump function.

Evaporating type condensing air conditioner heat pump system the most according to claim 1, it is characterized in that: described finned tube exchanger (4) is a kind of air-cooled condenser, evaporative condenser (5) is a kind of wind water cooling cooler condenser based on water evaporation latent heat, by controlling loop modulation cross valve (2), electromagnetic valve adjusts refrigerant flow direction, rely on evaporative condenser (5) independent with finned tube exchanger (4), series connection, parallel running mode, system is made to realize Effec-tive Function during refrigeration, and it is provided simultaneously with air source heat pump function, realize the two to organically combine.

Evaporating type condensing air conditioner heat pump system the most according to claim 1, it is characterized in that: described evaporative condenser (5) and spray water system (6) are integrated in air cooling module machine casing, spray water system includes water circulating pump (23), nozzle (24), collecting-tank (21) and ball-cock assembly (22), it is provided with collecting-tank (21) at air cooling module machine bottom of shell, collecting-tank (21) is connected with the nozzle (24) of top water-locator by water circulating pump (23), controls water inlet by ball-cock assembly (22)；Nozzle (24) is right against evaporative condenser (5), the top of air cooling module machine casing is provided with blower fan (11), relies on blower fan (11) to get rid of the high damp-heat air that evaporative condenser (5) is formed when refrigerating operaton cools down；When heating operation, rely on blower fan (11) to drive air to flow through finned tube exchanger (4), make unit cold-producing medium obtain heat from Cryogenic air thermal source.

Evaporating type condensing air conditioner heat pump system the most according to claim 1, it is characterized in that: the heat exchange unit branch road A being connected with evaporative condenser (5) includes that evaporative condenser (5), electromagnetic valve B (14), check valve A (15) form, the heat exchange unit branch road B being connected with finned tube exchanger (4) includes that finned tube exchanger (4), electromagnetic valve A (13), check valve E (19) form, and is connected by electromagnetic valve D (12) between two branch roads.