A three-operating system with ejector

Abstract

The present invention discloses a three-condition system with an ejector, aiming to provide a three-condition system in which a single-stage compression refrigeration system is used in air conditioning working condition, a quasi-two-stage compression refrigeration system with an ejector and intermediate air supply is used in ice making working condition, and a quasi-two-stage compression heat pump system with an ejector and intermediate air supply is used in winter heating working condition, so as to reduce the initial investment cost of the system, reduce energy consumption and operating costs, and save energy. The system includes a compressor with intermediate air supply, a four-way reversing valve, an outdoor heat exchanger, an indoor heat exchanger, an ice making evaporator, an economizer, an ejector, a throttling device, a regulating valve group and a plurality of valves. The switching of the single-stage compression refrigeration system, the quasi-two-stage compression refrigeration system with an ejector and the quasi-two-stage compression heat pump system with an ejector and intermediate air supply is realized by opening and closing a plurality of valves, thereby reducing the initial investment of the system.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and more specifically, to a three-mode system capable of realizing air conditioning refrigeration, ice-making refrigeration with intermediate air supplementation of an ejector, and a heat pump system with intermediate air supplementation of an ejector. Background Art

[0002] With the increase in the use of air conditioners, the demand for air conditioning electricity in summer continues to increase. The demand for air conditioning cooling is mainly concentrated in the period of time when the temperature is higher in summer during the day, and the demand is lower at night. The power consumption of air conditioning causes certain peaks and valleys in electricity consumption. How to achieve peak shaving and valley filling of air conditioning power consumption has gradually become a hot research issue.

[0003] At present, ice storage technology is one of the main means to solve the problem of peak load shaving and valley load filling of air-conditioning power consumption. The performance of the ice storage system under ice-making conditions has an important impact on the operating performance of the entire system, and also affects the operating efficiency of the entire system. The traditional ice storage system requires a dual-mode host to make ice and store cold under ice-making conditions during the low electricity price period. Under ice-making conditions, in order to obtain 0°C ice during ice-making operation, the evaporation temperature of the refrigerator often needs to be reduced to below -8°C. Due to the reduction in evaporation temperature, the efficiency of the host is significantly reduced, resulting in a decrease in the coefficient of performance (COP) of the refrigerator operation during the nighttime ice storage process, resulting in energy waste.

[0004] In winter, air source heat pumps are widely used due to their energy-saving and environmentally friendly technical characteristics. However, the single-stage compression cycle has a high compression ratio and low system efficiency, and its application is subject to certain restrictions. To improve the efficiency of air source heat pumps and achieve heating at an outdoor temperature of -25℃, a two-stage compression cycle can be used. However, when using two-stage compression to achieve winter heating, if the system is designed to meet the heating load requirements of the outdoor temperature of -25℃, the cooling capacity configured by the system during summer cooling is far greater than the cooling load of the building. During summer operation, more than half of the units in the system will be idle, resulting in waste.

[0005] In the usual quasi-two-stage compression system, the throttling element in the auxiliary circuit has a large effective energy loss. In the conventional cycle, the expansion throttling process is an irreversible process, and the enthalpy before and after throttling remains unchanged. This part of the thermodynamic loss is inherent in this type of cycle. Some researchers have tried to use reciprocating, rotary or turbine expanders to replace expansion valves, but these devices have high investment, operation and maintenance costs, are easily damaged when working in the two-phase region, and have certain difficulties in practical application. Summary of the invention

[0006] The purpose of the present invention is to address the technical defects existing in the prior art and to provide a three-operating system, which adopts a single-stage compression refrigeration system for air-conditioning operation, a quasi-two-stage compression refrigeration system with an ejector and intermediate air supply for ice-making operation, and a quasi-two-stage compression heat pump system with an ejector and intermediate air supply for winter heating operation, so as to reduce the initial investment cost of the system, reduce energy consumption and operating costs, and save energy.

[0007] The technical solution adopted to achieve the purpose of the present invention is:

[0008] A three-condition system with an ejector comprises a compressor with intermediate air supply, a four-way reversing valve, an outdoor heat exchanger, an indoor heat exchanger, an ice-making evaporator, an economizer, an ejector, a throttling device, a regulating valve group and a plurality of valves; under air-conditioning working conditions, the working medium is pressurized by the compressor and then enters the outdoor heat exchanger through the four-way reversing valve to condense and dissipate heat, and after condensation and heat dissipation, the working medium flows through the indoor heat exchanger through throttling and pressure reduction to form a single-stage compression refrigeration cycle; under ice-making working conditions, the working medium is pressurized by the compressor and then enters the outdoor heat exchanger through the four-way reversing valve to condense and dissipate heat, and after condensation and heat dissipation, the working medium flows through the ice-making evaporator after throttling, the gas outlet of the economizer is connected to the inlet of the ejector, the outlet of the ejector is connected to the air supply end of the compressor, and the outlet of the ice-making evaporator is divided into two paths, one of which passes through the four-way reversing valve. The reversing valve is connected to the suction end of the compressor; the other path is connected to the ejection fluid inlet of the ejector through the regulating valve in the regulating valve group, forming a compression refrigeration cycle with intermediate air supply of the ejector; under winter heating conditions, the working medium enters the indoor heat exchanger through the four-way reversing valve after being pressurized by the compressor to condense and dissipate heat, thereby generating a heating phenomenon; after the working medium is condensed and dissipated, it flows through the outdoor heat exchanger after throttling, the gas outlet of the economizer is connected to the inlet of the ejector, the outlet of the ejector is connected to the air supply end of the compressor, the outlet of the outdoor heat exchanger is divided into two paths, one path enters the suction end of the compressor through the four-way reversing valve; the other path is connected to the ejection fluid inlet of the ejector through the regulating valve in the regulating valve group, forming a heat pump cycle with intermediate air supply of the ejector; the ice-making evaporator is placed in the ice-making bucket.

[0009] The throttling device includes a first throttle valve, a second throttle valve and a third throttle valve, and the regulating valve group includes a first regulating valve and a second regulating valve; the exhaust end of the compressor is connected to the first interface of the four-way reversing valve, the suction end of the compressor is connected to the third interface of the four-way reversing valve, the second interface of the four-way reversing valve is respectively connected to the first interface of the outdoor heat exchanger and the first interface of the second regulating valve, the second interface of the second regulating valve is connected to the injection fluid inlet of the ejector after being connected in parallel with the second interface of the first regulating valve, the second interface of the outdoor heat exchanger, the first interface of the first valve, the first interface of the third throttle valve and the first interface of the second valve are connected; the second interface of the first valve is connected to the first liquid inlet of the economizer, the second interface of the second valve is connected to the first interface of the first throttle valve, the second interface of the first throttle valve is respectively connected to the third The second interface of the valve is connected to the first interface of the indoor heat exchanger, the liquid outlet of the economizer is respectively connected to the second interface of the third throttle valve and the first interface of the fourth valve, the gas outlet of the economizer is connected to the inlet of the ejector, and the outlet of the ejector is connected to the air supply end of the compressor; the second interface of the fourth valve is divided into two paths, one path is connected to the second liquid inlet of the economizer through the sixth valve, and the other path is connected to the first interface of the second throttle valve; the second interface of the second throttle valve is connected to the first interface of the ice-making evaporator after being connected in parallel with the first interface of the third valve; the second interface of the ice-making evaporator is respectively connected to the first interface of the first regulating valve and the first interface of the fifth valve, the second interface of the fifth valve is connected to the fourth interface of the four-way reversing valve after being connected in parallel with the second interface of the indoor heat exchanger; the second throttle valve is a two-way throttle valve.

[0010] The economizer is a flash economizer.

[0011] The first interface of the four-way reversing valve is connected to the second interface, the third interface of the four-way reversing valve is connected to the fourth interface, the second valve is opened, and the first valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the first regulating valve and the second regulating valve are closed; the exhaust end of the compressor, the first interface of the four-way reversing valve, the second interface of the four-way reversing valve, the outdoor heat exchanger, the second valve, the first throttle valve, the indoor heat exchanger, the fourth interface of the four-way reversing valve, and the third interface of the four-way reversing valve are connected in sequence and then return to the suction end of the compressor to form a single-stage compression refrigeration cycle.

[0012] The first interface of the four-way reversing valve is connected to the second interface, the third interface of the four-way reversing valve is connected to the fourth interface, the first valve, the fourth valve, the fifth valve and the first regulating valve are opened, and the second valve, the third valve, the sixth valve and the second regulating valve are closed; the compressor, the first interface of the four-way reversing valve, the second interface of the four-way reversing valve, the outdoor heat exchanger, the first valve, the first liquid inlet of the economizer, the liquid outlet of the economizer, the fourth valve, the second throttle valve, the ice-making evaporator, the fifth valve, the fourth interface of the four-way reversing valve, and the third interface of the four-way reversing valve are connected in sequence and then returned to the suction end of the compressor to form a compression refrigeration cycle; the gas outlet of the economizer is connected to the inlet of the ejector, the outlet of the ejector is connected to the air supply end of the compressor, and the outlet of the ice-making evaporator is connected to the ejection fluid inlet of the ejector through the first regulating valve to form a compression refrigeration cycle with intermediate air supply of the ejector.

[0013] The first interface of the four-way reversing valve is connected to the fourth interface, the second interface of the four-way reversing valve is connected to the third interface, the third valve, the sixth valve and the second regulating valve are opened, and the first valve, the second valve, the fourth valve, the fifth valve and the first regulating valve are closed; the exhaust end of the compressor, the first interface of the four-way reversing valve, the fourth interface of the four-way reversing valve, the indoor heat exchanger, the third valve, the second throttle valve, the sixth valve, the second liquid inlet of the economizer, the liquid outlet of the economizer, the third throttle valve, the outdoor heat exchanger, the second interface of the four-way reversing valve, and the third interface of the four-way reversing valve are connected in sequence and then returned to the suction end of the compressor to form a compression refrigeration cycle; the gas outlet of the economizer is connected to the inlet of the ejector, the outlet of the ejector is connected to the air supply end of the compressor, and the outlet of the outdoor heat exchanger is connected to the ejection fluid inlet of the ejector through the second regulating valve to form a heat pump cycle with intermediate air supply of the ejector.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The three-condition system of the present invention is a single-stage compression refrigeration cycle in the air conditioning condition; in the ice-making condition, the system is a quasi-two-stage compression refrigeration cycle with an ejector and intermediate air supply; in the winter heating condition, the system is a quasi-two-stage compression heat pump system with an ejector and intermediate air supply. In the ice-making condition, the system heat absorption limit temperature is lower than the single-stage compression heat absorption limit temperature in the air-conditioning condition, which can more effectively complete the ice-making condition, reduce the usage of the system units, reduce the energy consumption of the system, reduce the operating cost, reduce the initial investment cost of the system, and reduce the idle rate of the air-conditioning condition units. In the winter heating condition, the heat supply of the two-stage compression with intermediate air supply can meet the heat load of the building, reduce the usage of the units, reduce the energy consumption of the system, and save the initial investment cost of the system.

[0016] 2. The three-condition system of the present invention adds an air supply channel under the ice-making condition. During the compression process, the exhaust temperature of the compressor is lower than that without air supply due to the cooling of the intermediate air supply. At the same time, since part of the steam does not undergo a complete compression process from low pressure to high pressure, but only undergoes a compression process from low pressure to exhaust pressure, the power consumption of the compressor is reduced, the refrigeration performance coefficient of the system is improved, and electric energy is effectively saved. In the winter heating condition, an air supply channel is added. When the outdoor temperature is low in winter, a two-stage compression cycle with intermediate air supply is adopted, the compression ratio of the compressor is small, and the system efficiency is high.

[0017] 3. When the three-condition system of the present invention is in ice-making operation, supercooling of the working medium is achieved through the economizer, thereby achieving a larger heat transfer coefficient between water and the refrigerant. Thus, continuous ice-making with supercooled water for the ice storage system can improve the energy efficiency of the ice storage system.

[0018] 4. The ejector has a simple structure, low cost, no moving parts, and is suitable for two-phase flow conditions. It can increase the pressure of the ejected fluid without directly consuming mechanical energy, effectively reducing the loss of available energy. Therefore, the system structure is simple, the processing and installation are convenient, the energy utilization efficiency is high, and the operation is stable.

[0019] 5. Compared with the common air supply system, the ejector is used to replace the throttling element of the air supply circuit. The ejector can recover the energy loss in the throttling process of the high-pressure fluid, eject and increase the pressure of the low-pressure fluid, and improve the performance coefficient of the system.

[0020] 6. Compared with the ordinary air supply system, the use of the ejector can adjust the air supply volume, increase the relative air supply volume, further reduce the exhaust enthalpy value of the compressor, and improve the energy efficiency ratio.

[0021] 7. The three-operating-condition system of the present invention is used to make ice and store cold at night with excess electricity, and to supplement the cold demand during the day with the stored cold to balance the peak and valley loads of the power grid.

[0022] 8. The three-condition system of the present invention can save the capacity of the refrigeration host and the cost of power capacity expansion equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure shows the structural principle diagram of the three-operating-mode system with an ejector of the present invention;

[0024] Figure 2 Shown is a schematic diagram of the interface of a four-way reversing valve. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] The three-condition system with ejector of the present invention comprises a compressor 1 with intermediate air supply, a four-way reversing valve 7, an outdoor heat exchanger 2, an indoor heat exchanger 10, an ice-making evaporator 6, an economizer 5, an ejector 9, a throttling device, a regulating valve group and a plurality of valves. Under air-conditioning conditions, the working medium is pressurized by the compressor and then enters the outdoor heat exchanger through the four-way reversing valve for condensation and heat dissipation. After condensation and heat dissipation, the working medium is throttled and decompressed by the throttling device and flows through the indoor heat exchanger to form a single-stage compression refrigeration cycle. Under ice-making conditions, the working fluid is pressurized by the compressor and then enters the outdoor heat exchanger through the four-way reversing valve for condensation and heat dissipation. After condensation and heat dissipation, the working fluid flows through the ice-making evaporator after passing through the throttling device. The gas outlet of the economizer is connected to the inlet of the ejector, and the outlet of the ejector is connected to the air supply end of the compressor. The outlet of the ice-making evaporator is divided into two paths, one of which is connected to the suction end of the compressor after passing through the valve and the four-way reversing valve; the other is connected to the ejection fluid inlet of the ejector through the regulating valve, forming a compression refrigeration cycle with intermediate air supply of the ejector. Under winter heating conditions, the working fluid enters the indoor heat exchanger through the four-way reversing valve after being pressurized by the compressor to condense and dissipate heat, generating a heating phenomenon. After condensation and dissipation, the working fluid flows through the outdoor heat exchanger after passing through the throttling device. The gas outlet of the economizer is connected to the inlet of the ejector, and the outlet of the ejector is connected to the air supply end of the compressor. The outlet of the outdoor heat exchanger is divided into two paths, one of which enters the suction end of the compressor after passing through the four-way reversing valve; the other is connected to the ejection fluid inlet of the ejector through the regulating valve, forming a heat pump cycle with an ejector for intermediate air supply. The indoor heat exchanger is placed indoors, the ice-making evaporator is placed in the ice-making bucket, and the outdoor heat exchanger is placed outdoors. The design key points of the present invention are: during air-conditioning working conditions, a single-stage compression refrigeration cycle under air-conditioning working conditions can be realized by switching valves and regulating valves; during ice-making working conditions, a quasi-two-stage compression refrigeration cycle with intermediate air supply from an ejector can be realized by switching valves and regulating valves; during winter heating working conditions, a quasi-two-stage compression heat pump cycle with intermediate air supply from an ejector can be realized by switching valves and regulating valves.

[0027] The present invention is described in detail below by taking the economizer as a flash generator as an example.

[0028] The schematic diagram of the three-operating system with ejector of the present invention is as follows Figure 1As shown, it includes a compressor 1 with intermediate air supply, a four-way reversing valve 7, an outdoor heat exchanger 2, an indoor heat exchanger 10, an ice-making evaporator 6, an economizer 5, an ejector 9, a throttling device, a regulating valve group, and six valves including a first valve 4-1, a second valve 4-2, a third valve 4-3, a fourth valve 4-4, a fifth valve 4-5, and a sixth valve 4-6. The throttling device includes a first throttle valve 3-1, a second throttle valve 3-2, and a third throttle valve 3-3, and the regulating valve group includes a first regulating valve 8-1 and a second regulating valve 8-2. The exhaust end of the compressor 1 is connected to the first interface 7-1 of the four-way reversing valve 7, the suction end of the compressor 1 is connected to the third interface 7-3 of the four-way reversing valve 7, the second interface 7-2 of the four-way reversing valve 7 is respectively connected to the first interface of the outdoor heat exchanger 2 and the first interface of the second regulating valve 8-2, the second interface of the second regulating valve 8-2 is connected to the injection fluid inlet of the ejector 9 after being connected in parallel with the second interface of the first regulating valve 8-1; the second interface of the outdoor heat exchanger 2, the first interface of the first valve 4-1, the first interface of the third throttle valve 3-3 and the first interface of the second valve 4-2 are connected; the second interface of the first valve 4-1 is connected to the first liquid inlet of the economizer, the second interface of the second valve 4-2 is connected to the first interface of the first throttle valve 3-1, the second interface of the first throttle valve 3-1 is respectively connected to the second interface of the third valve 4-3 and the first interface of the indoor heat exchanger 10 An interface is connected, the liquid outlet of the economizer is connected to the second interface of the third throttle valve and the first interface of the fourth valve 4-4 respectively, the gas outlet of the economizer 5 is connected to the inlet of the ejector 9, and the outlet of the ejector 9 is connected to the air supply end of the compressor 1; the second interface of the fourth valve 4-4 is divided into two paths, one path is connected to the second liquid inlet of the economizer 5 through the sixth valve 4-6; the other path is connected to the first interface of the second throttle valve 3-2; the second interface of the second throttle valve is connected in parallel with the first interface of the third valve 4-3 and then connected to the first interface of the ice-making evaporator 6; the second interface of the ice-making evaporator 6 is connected to the first interface of the first regulating valve 8-1 and the first interface of the fifth valve 4-5 respectively, the second interface of the fifth valve 4-5 is connected in parallel with the second interface of the indoor heat exchanger 10 and then connected to the fourth interface 7-4 of the four-way reversing valve 7; the second throttle valve 3-2 is a two-way throttle valve. The switching of a single-stage compression refrigeration system, a quasi-two-stage compression refrigeration system with intermediate air supply from an ejector, and a quasi-two-stage compression heat pump system with intermediate air supply from an ejector is achieved by opening and closing the first valve 4-1, the second valve 4-2, the third valve 4-3, the fourth valve 4-4, the fifth valve 4-5, the sixth valve 4-6, the first regulating valve 8-1, and the second regulating valve 8-2.

[0029] Under air-conditioning conditions, the first interface 7-1 of the four-way reversing valve is connected to the second interface 7-2, the third interface 7-3 of the four-way reversing valve is connected to the fourth interface 7-4, the second valve 4-2 is opened, and the first valve 4-1, the third valve 4-3, the fourth valve 4-4, the fifth valve 4-5, the sixth valve 4-6, the first regulating valve 8-1 and the second regulating valve 8-2 are closed. The exhaust end of the compressor 1, the four-way reversing valve 7, the outdoor heat exchanger 2, the second valve 4-2, the first throttle valve 3-1, the indoor heat exchanger 10, the fourth interface 7-4 of the four-way reversing valve, and the third interface 7-3 of the four-way reversing valve are connected in sequence and then returned to the suction end of the compressor to form a single-stage compression refrigeration cycle. The compressor 1 inhales low-pressure gas from the indoor heat exchanger 10, and the low-pressure gas is compressed and pressurized by the compressor 1 to become high-pressure gas. The high-pressure gas flows through the exhaust end of the compressor 1 through the four-way reversing valve 7 and is discharged into the outdoor heat exchanger 2. The high-pressure gas condenses and releases heat through the outdoor heat exchanger 2 to become high-pressure liquid. The high-pressure liquid passes through the second valve 4-2 and is throttled and reduced in pressure by the first throttle valve 3-1 to become low-pressure wet steam. The low-pressure wet steam enters the indoor heat exchanger 10 to evaporate and absorb heat in the room to become low-pressure steam, and then flows through the four-way reversing valve 7 back to the suction end of the compressor 1, completing the single-stage compression refrigeration cycle of the air-conditioning working condition.

[0030] Under ice-making conditions, the first interface of the four-way reversing valve is connected to the second interface, the third interface of the four-way reversing valve is connected to the fourth interface, the first valve 4-1, the fourth valve 4-4, the fifth valve 4-5 and the first regulating valve 8-1 are opened, and the second valve 4-2, the third valve 4-3, the sixth valve 4-6 and the second regulating valve 8-2 are closed. The compressor 1, the first interface 7-1 of the four-way reversing valve 7, the second interface 7-2 of the four-way reversing valve, the outdoor heat exchanger 2, the first valve 4-1, the first liquid inlet of the economizer 5, the liquid outlet of the economizer 5, the fourth valve 4-4, the second throttle valve 3-2, the ice-making evaporator 6, the fifth valve 4-5, the fourth interface 7-4 of the four-way reversing valve, and the third interface 7-3 of the four-way reversing valve are connected in sequence and then return to the suction end of the compressor to form a compression refrigeration cycle; the gas outlet of the economizer 5 is connected to the inlet of the ejector 9, the outlet of the ejector 9 is connected to the air supply end of the compressor 1, and the outlet of the ice-making evaporator 6 is connected to the ejection fluid inlet of the ejector 9 through the first regulating valve 8-1, forming a compression refrigeration cycle with intermediate air supply of the ejector. The compressor 1 sucks low-pressure gas from the ice-making evaporator 6, and the low-pressure gas is compressed and increased in pressure by the compressor 1 to become high-pressure gas. The high-pressure gas enters the outdoor heat exchanger 2 through the exhaust end of the compressor 1 through the four-way reversing valve 7 and is condensed into high-pressure liquid. The high-pressure liquid coming out of the second interface of the outdoor heat exchanger 2 flows through the first valve 4-1 and enters the economizer 5. The high-pressure steam flashed from the upper part of the economizer 5 is used as the working fluid of the ejector 9, and part of the low-pressure steam at the outlet of the ice-making evaporator 6 is ejected. The two fluids are mixed and expanded by the ejector 9 to form medium-pressure steam as the intermediate supplementary air and enter the supplementary air end of the compressor 1. The subcooled liquid working fluid at the bottom of the economizer 5 passes through the fourth valve 4-4 and is throttled and reduced in pressure by the second throttle valve 3-2 to become low-pressure wet steam, and then enters the ice-making evaporator 6 to evaporate and absorb heat to become low-pressure steam. A part of the low-pressure steam flowing out of the ice-making evaporator 6 enters the ejection fluid inlet of the ejector 9 through the first regulating valve 8-1 as the ejection fluid; another part of the low-pressure steam passes through the fifth valve 4-5 and then flows through the four-way reversing valve 7 and is sucked into the compressor 1, completing the compression refrigeration cycle of the ice-making condition.

[0031] Under winter heating conditions, the first interface 7-1 of the four-way reversing valve is connected to the fourth interface 7-4, the second interface 7-2 of the four-way reversing valve is connected to the third interface 7-3, the third valve 4-3, the sixth valve 4-6 and the second regulating valve 8-2 are opened, and the first valve 4-1, the second valve 4-2, the fourth valve 4-4, the fifth valve 4-5 and the first regulating valve 8-1 are closed. The exhaust end of the compressor 1, the first interface 7-1 of the four-way reversing valve 7, the fourth interface 7-4 of the four-way reversing valve, the indoor heat exchanger 10, the third valve 4-3, the second throttle valve 3-2, the sixth valve 4-6, the second liquid inlet of the economizer 5, the liquid outlet of the economizer 5, the third throttle valve 3-3, the outdoor heat exchanger 2, the second interface 7-2 of the four-way reversing valve, and the third interface 7-3 of the four-way reversing valve are connected in sequence and then returned to the suction end of the compressor 1 to form a compression refrigeration cycle; the gas outlet of the economizer 5 is connected to the inlet of the ejector 9, the outlet of the ejector 9 is connected to the air supply end of the compressor 1, and the outlet of the outdoor heat exchanger 2 is connected to the ejection fluid inlet of the ejector 9 through the second regulating valve 8-2 to form a heat pump cycle with intermediate air supply of the ejector. The compressor 1 sucks low-pressure gas from the outdoor heat exchanger 2, and the low-pressure gas flows through the four-way reversing valve 7 and enters the compressor 1 to be compressed and increased in pressure to become high-pressure gas. The high-pressure gas flows through the exhaust end of the compressor 1 through the four-way reversing valve 7 and enters the indoor heat exchanger 10 to condense and dissipate heat to become high-pressure liquid. The high-pressure liquid coming out of the indoor heat exchanger 10 passes through the third valve 4-3, and then throttles and reduces pressure through the second throttle valve 3-2, and then enters the second liquid inlet of the economizer 5 through the sixth valve 4-6. The high-pressure steam flashed from the upper part of the economizer 5 is used as the working fluid of the ejector 9, and part of the low-pressure steam at the outlet of the outdoor heat exchanger 2 is ejected. The two fluids are mixed and expanded by the ejector 9 to form medium-pressure steam as the intermediate supplementary gas and enter the supplementary gas end of the compressor 1. The subcooled liquid working medium at the bottom of the economizer 5 is throttled and reduced in pressure through the third throttle valve 3-3 to become low-pressure wet steam, and then enters the outdoor heat exchanger 2 to evaporate and absorb heat to become low-pressure steam. A part of the low-pressure steam flowing out of the outdoor heat exchanger 2 enters the ejection fluid inlet of the ejector 9 through the second regulating valve 8-2 as the ejection fluid; the other part of the low-pressure steam flows through the four-way reversing valve 7 and is sucked into the compressor 1 to complete the heat pump cycle under heating conditions.

[0032] The throttling device is an electronic expansion valve, a thermal expansion valve, a capillary tube or an orifice plate throttling device.

[0033] The three-operating-condition system of the present invention is a single-stage compression refrigeration cycle in air-conditioning operating condition; in ice-making operating condition, the system is a quasi-two-stage compression refrigeration cycle with an ejector and intermediate air supply; in winter heating operating condition, the system is a quasi-two-stage compression heat pump cycle with an ejector and intermediate air supply. Under the ice-making condition, the system's heat absorption limit temperature is lower than the single-stage compression heat absorption limit temperature under the air-conditioning condition, so the ice-making condition can be completed more effectively, the usage of the system units can be reduced, the energy consumption of the system is reduced, the initial investment cost of the system is reduced, the idle rate of the air-conditioning condition units is reduced, the energy efficiency of the ice storage system is improved, electric energy is saved, the peak and valley loads of the power grid can be balanced, and the operation cost is effectively reduced; under the winter heating condition, when the outdoor temperature is low, a two-stage compression cycle with intermediate air supply is adopted, the compressor compression ratio is small, the system efficiency is high, and the heating capacity of the two-stage compression with intermediate air supply can meet the heat load of the building. The present invention improves the efficiency of the system, reduces the energy consumption of the system, and saves the cost of the system; in the ice-making condition and the heating condition, an ejector is used to realize a quasi-two-stage compression system with intermediate air supply, and an ejector is used instead of a conventional throttling element, so as to give full play to the advantages of the ejector with simple structure, low cost, no moving parts, and adaptability to two-phase flow conditions, and the pressure of the ejected fluid can be increased without directly consuming mechanical energy, thereby effectively reducing the loss of available energy.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A three-mode system with an ejector, characterized in that: It includes a compressor with intermediate air supply, a four-way reversing valve, an outdoor heat exchanger, an indoor heat exchanger, an ice-making evaporator, an economizer, an ejector, a throttling device, a regulating valve group and a plurality of valves; under air-conditioning conditions, the working fluid is pressurized by the compressor and then enters the outdoor heat exchanger through the four-way reversing valve for condensation and heat dissipation, and after condensation and heat dissipation, the working fluid flows through the indoor heat exchanger through throttling and pressure reduction to form a single-stage compression refrigeration cycle; Under ice-making conditions, the working fluid is pressurized by the compressor and then enters the outdoor heat exchanger through the four-way reversing valve to condense and dissipate heat. After condensation and heat dissipation, the working fluid flows through the ice-making evaporator after throttling. The gas outlet of the economizer is connected to the inlet of the ejector, and the outlet of the ejector is connected to the air supply end of the compressor. The outlet of the ice-making evaporator is divided into two paths, one of which is connected to the suction end of the compressor through the four-way reversing valve; the other is connected to the ejection fluid inlet of the ejector through the regulating valve in the regulating valve group, forming a compression refrigeration cycle with intermediate air supply of the ejector; under winter heating conditions Under the above, the working fluid is pressurized by the compressor and then enters the indoor heat exchanger through the four-way reversing valve for condensation and heat dissipation, thereby generating a heating phenomenon. After condensation and heat dissipation, the working fluid flows through the outdoor heat exchanger after throttling. The gas outlet of the economizer is connected to the inlet of the ejector, and the outlet of the ejector is connected to the air supply end of the compressor. The outlet of the outdoor heat exchanger is divided into two paths, one of which enters the suction end of the compressor through the four-way reversing valve; the other is connected to the ejection fluid inlet of the ejector through the regulating valve in the regulating valve group, thereby forming a heat pump cycle with an ejector for intermediate air supply; the ice-making evaporator is placed in the ice-making bucket; The throttling device includes a first throttle valve, a second throttle valve and a third throttle valve, and the regulating valve group includes a first regulating valve and a second regulating valve; the exhaust end of the compressor is connected to the first interface of the four-way reversing valve, the suction end of the compressor is connected to the third interface of the four-way reversing valve, the second interface of the four-way reversing valve is respectively connected to the first interface of the outdoor heat exchanger and the first interface of the second regulating valve, the second interface of the second regulating valve is connected to the injection fluid inlet of the ejector after being connected in parallel with the second interface of the first regulating valve, the second interface of the outdoor heat exchanger, the first interface of the first valve, the first interface of the third throttle valve and the first interface of the second valve are connected; the second interface of the first valve is connected to the first liquid inlet of the economizer, the second interface of the second valve is connected to the first interface of the first throttle valve, the second interface of the first throttle valve is respectively connected to the second interface of the first throttle valve, and the second interface of the first throttle valve is respectively connected to the first interface of the second throttle valve. The second interface of the three valves is connected to the first interface of the indoor heat exchanger, the liquid outlet of the economizer is respectively connected to the second interface of the third throttle valve and the first interface of the fourth valve, the gas outlet of the economizer is connected to the inlet of the ejector, and the outlet of the ejector is connected to the air supply end of the compressor; the second interface of the fourth valve is divided into two paths, one path is connected to the second liquid inlet of the economizer through the sixth valve, and the other path is connected to the first interface of the second throttle valve; the second interface of the second throttle valve is connected to the first interface of the ice-making evaporator in parallel with the first interface of the third valve; the second interface of the ice-making evaporator is respectively connected to the first interface of the first regulating valve and the first interface of the fifth valve, and the second interface of the fifth valve is connected to the fourth interface of the four-way reversing valve in parallel with the second interface of the indoor heat exchanger; the second throttle valve is a two-way throttle valve; The throttling device is an electronic expansion valve, a thermal expansion valve, a capillary tube or an orifice plate throttling device.

2. The three-mode system with ejector according to claim 1, characterized in that: The economizer is a flash economizer.

3. The three-mode system with ejector according to claim 1 is characterized in that: The first interface of the four-way reversing valve is connected to the second interface, the third interface of the four-way reversing valve is connected to the fourth interface, the second valve is opened, and the first valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the first regulating valve and the second regulating valve are closed; the exhaust end of the compressor, the first interface of the four-way reversing valve, the second interface of the four-way reversing valve, the outdoor heat exchanger, the second valve, the first throttle valve, the indoor heat exchanger, the fourth interface of the four-way reversing valve, and the third interface of the four-way reversing valve are connected in sequence and then return to the suction end of the compressor to form a single-stage compression refrigeration cycle.

4. The three-mode system with ejector according to claim 1, characterized in that: The first interface of the four-way reversing valve is connected to the second interface, the third interface of the four-way reversing valve is connected to the fourth interface, the first valve, the fourth valve, the fifth valve and the first regulating valve are opened, and the second valve, the third valve, the sixth valve and the second regulating valve are closed; the compressor, the first interface of the four-way reversing valve, the second interface of the four-way reversing valve, the outdoor heat exchanger, the first valve, the first liquid inlet of the economizer, the liquid outlet of the economizer, the fourth valve, the second throttle valve, the ice-making evaporator, the fifth valve, the fourth interface of the four-way reversing valve, and the third interface of the four-way reversing valve are connected in sequence and then returned to the suction end of the compressor to form a compression refrigeration cycle; the gas outlet of the economizer is connected to the inlet of the ejector, the outlet of the ejector is connected to the air supply end of the compressor, and the outlet of the ice-making evaporator is connected to the ejection fluid inlet of the ejector through the first regulating valve to form a compression refrigeration cycle with intermediate air supply of the ejector.

5. The three-mode system with ejector according to claim 1, characterized in that: The first interface of the four-way reversing valve is connected to the fourth interface, the second interface of the four-way reversing valve is connected to the third interface, the third valve, the sixth valve and the second regulating valve are opened, and the first valve, the second valve, the fourth valve, the fifth valve and the first regulating valve are closed; the exhaust end of the compressor, the first interface of the four-way reversing valve, the fourth interface of the four-way reversing valve, the indoor heat exchanger, the third valve, the second throttle valve, the sixth valve, the second liquid inlet of the economizer, the liquid outlet of the economizer, the third throttle valve, the outdoor heat exchanger, the second interface of the four-way reversing valve, and the third interface of the four-way reversing valve are connected in sequence and then returned to the suction end of the compressor to form a compression refrigeration cycle; the gas outlet of the economizer is connected to the inlet of the ejector, the outlet of the ejector is connected to the air supply end of the compressor, and the outlet of the outdoor heat exchanger is connected to the ejection fluid inlet of the ejector through the second regulating valve to form a heat pump cycle with intermediate air supply of the ejector.

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