Flash evaporator, refrigeration system and multi-stage compression refrigeration method

Abstract

The application relates to a flash evaporator, a refrigeration system and a multi-stage compression refrigeration method, and relates to the technical field of refrigeration. The flash evaporator comprises a main body and a noise elimination assembly. The main body is provided with a reaction cavity, a feeding port and an exhaust port. The feeding port and the exhaust port are both communicated with the reaction cavity. The feeding port is used for conveying high-pressure liquid refrigerant to the reaction cavity. The high-pressure liquid refrigerant is evaporated to generate refrigerant steam in the reaction cavity. The exhaust port is used for outputting the refrigerant steam. The noise elimination assembly is installed at one end of the exhaust port of the main body, so as to reduce the airflow pressure pulsation at the exhaust port. The application can reduce the pressure loss of the refrigerant steam and improve the refrigeration capacity of the refrigeration system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, in particular to a flash evaporator, a refrigeration system and a multi-stage compression refrigeration method. BACKGROUND

[0002] In related technologies, screw water chillers are mostly used in the field of refrigeration and air conditioning. The screw water chiller is a packaged refrigeration device composed of a screw refrigeration compressor, a condenser, an evaporator, a thermal expansion valve, an oil separator, and automatic control elements and instruments. When adjusting the exhaust temperature of the compressor, an external heat exchange plate is mostly used to reduce the heat of the compressor and increase the refrigeration capacity. However, the pipeline connection structure of the compressor and the external heat exchange plate is complex, and the pressure loss of the refrigerant in the pipeline is large, which affects the efficiency of the unit. SUMMARY

[0003] Therefore, it is necessary to provide a flash evaporator, a refrigeration system and a multi-stage compression refrigeration method to solve the problem of large pressure loss of refrigerant in the refrigeration system.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] In a first aspect, the present application provides a flash evaporator, comprising:

[0006] a main body, the main body is provided with a reaction cavity, a feed inlet and an exhaust outlet, the feed inlet and the exhaust outlet are both communicated with the reaction cavity, the feed inlet is used for conveying high-pressure liquid refrigerant to the reaction cavity, the high-pressure liquid refrigerant is evaporated to generate refrigerant vapor in the reaction cavity, and the exhaust outlet is used for outputting the refrigerant vapor;

[0007] a noise reduction assembly, the noise reduction assembly is installed at one end of the exhaust outlet of the main body to reduce the airflow pressure pulsation at the exhaust outlet.

[0008] Through the above design, the airflow pressure pulsation of the refrigerant vapor is reduced, thereby reducing the pipeline vibration, reducing the exhaust noise, and reducing the pressure loss.

[0009] In one of the embodiments of the first aspect, the noise reduction assembly comprises a noise reduction cylinder, a plurality of noise reduction cavities are arranged in the noise reduction cylinder, each noise reduction cavity is distributed along the axis of the noise reduction cylinder and communicated with the exhaust outlet.

[0010] Through the above design, in the propagation process of the noise, part of the sound is emitted in the direction of the sound source due to the change of the cross section of the channel, thereby reducing the exhaust noise of the refrigerant vapor.

[0011] In one of the embodiments of the first aspect, the muffling assembly further comprises an exhaust pipe coaxially arranged with the muffling cylinder and connected to the exhaust port at one end, and a plurality of air holes are arranged on the side of the exhaust pipe, the muffling cylinder is arranged outside the exhaust pipe, and each muffling cavity is in communication with a corresponding air hole.

[0012] Through the above design, the refrigerant vapor enters the muffling cavity from the air hole and then returns to the exhaust pipe for exhaust, the air holes of the exhaust pipe change the propagation of sound, and the muffling effect is further improved.

[0013] In one of the embodiments of the first aspect, the air holes are arranged along the axis of the exhaust pipe and sequentially form a plurality of air hole arrays, and the diameters of the air holes of different air hole arrays and the distances between adjacent air holes are different.

[0014] Through the above design, the diameters and densities of the air holes are different, so that the number and density of the air holes are adjusted according to different pulsating gas flow intensities, and the muffling effect is further improved.

[0015] In one of the embodiments of the first aspect, the main body is further provided with a liquid discharge port, and the liquid discharge port is arranged at the lower end of the main body in the direction of gravity.

[0016] Through the above design, after part of the refrigerant vapor is cooled and re-liquefied, the liquid refrigerant is discharged through the lower liquid discharge port for the next working process.

[0017] In one of the embodiments of the first aspect, a gas-liquid filter screen is arranged in the main body, and the gas-liquid filter screen is arranged at one end of the main body provided with the exhaust port.

[0018] Through the above design, the disturbance of the refrigerant is strengthened, the evaporation is fast, and the liquid refrigerant in the flash evaporator is avoided from being carried by the gas flow during the air supplementing process.

[0019] In the second aspect, the embodiments of the present application further provide a refrigeration system comprising the flash evaporator, the multi-stage compression device and the condenser in any of the above embodiments, the multi-stage compression device comprises a high-pressure stage compressor, the output end of the high-pressure stage compressor is connected to the input end of the condenser, the output end of the condenser is connected to the feed port of the flash evaporator, and the exhaust port of the flash evaporator is connected to the input end of the high-pressure stage compressor.

[0020] Through the above design, the high-pressure refrigerant gas is re-delivered to the condenser to form high-pressure liquid refrigerant, and the recycling use of the refrigerant is realized.

[0021] In one of the embodiments of the second aspect, the refrigeration system further comprises an evaporator, the multi-stage compression device comprises a low-pressure stage compressor, an input end of the evaporator is connected with the liquid outlet of the flash evaporator, an output end of the evaporator is connected with an input end of the low-pressure stage compressor, and an output end of the low-pressure stage compressor is communicated with the high-pressure stage compressor.

[0022] Through the above design, the enthalpy difference of the main loop refrigerant in the refrigeration system is increased, the refrigeration capacity of the compressor per unit mass of refrigerant is improved, and thus the refrigeration capacity of the refrigeration system is improved.

[0023] In one of the embodiments of the second aspect, a throttling element is arranged between the condenser and the flash evaporator and between the flash evaporator and the evaporator, and the throttling element is used to control the flow rate of the fluid in the refrigeration system.

[0024] Through the above design, the delivery rate of the fluid is adjusted, and the delivery pressure of the fluid is changed.

[0025] In a third aspect, the embodiments of the present application further provide a multi-stage compression refrigeration method, which adopts the flash evaporator or the refrigeration system in any of the above embodiments, and the multi-stage compression refrigeration method comprises the following steps:

[0026] The flash evaporator receives the high-pressure liquid refrigerant from the condenser through the feed port;

[0027] The high-pressure liquid refrigerant is rapidly evaporated in the low-pressure reaction cavity to generate the refrigerant vapor;

[0028] Part of the refrigerant vapor enters the input end of the high-pressure stage compressor through the exhaust port, and part of the refrigerant vapor is cooled to form saturated liquid refrigerant, and the saturated liquid refrigerant enters the evaporator through the liquid outlet;

[0029] The refrigerant vapor entering the high-pressure stage compressor is compressed and then enters the condenser again, is condensed to form the high-pressure liquid refrigerant, and is input to the flash evaporator again;

[0030] The saturated liquid refrigerant entering the evaporator is evaporated to form low-pressure refrigerant vapor, the low-pressure refrigerant vapor enters the low-pressure stage compressor for primary compression, enters the high-pressure stage compressor for secondary compression, and is delivered to the condenser, and finally returns to the flash evaporator.

[0031] Through the above design, the enthalpy difference of the main loop refrigerant in the refrigeration system is increased, the refrigeration capacity of the compressor per unit mass of refrigerant is improved, and thus the refrigeration capacity of the refrigeration system is improved.

[0032] Compared with the related art, the application has the beneficial effects that the application provides a flash evaporator, a refrigeration system and a multi-stage compression refrigeration method, which can reduce the pressure loss of the refrigeration system. The flash evaporator comprises a main body and a muffling assembly. The main body is provided with a reaction cavity for evaporation of high-pressure liquid refrigerant, a feed inlet for feeding the high-pressure liquid refrigerant to the reaction cavity, and an exhaust outlet for outputting refrigerant vapor. The muffling assembly is installed at one end of the exhaust outlet of the main body to reduce the airflow pressure pulsation at the exhaust outlet. In this way, the high-pressure liquid refrigerant is rapidly evaporated in the low-pressure flash evaporator to generate refrigerant vapor, and the refrigerant vapor is discharged into the compressor through the exhaust outlet to realize refrigerant circulation. By arranging the muffling assembly at the exhaust outlet, the airflow pressure pulsation at the exhaust outlet is reduced, the pressure loss of the refrigerant vapor is reduced, and the refrigeration capacity of the refrigeration system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0034] Figure 1 Structure diagram of the flash evaporator in some embodiments of the application;

[0035] Figure 2 Structure diagram of the main body in some embodiments of the application;

[0036] Figure 3 Structure diagram of the muffling assembly in some embodiments of the application;

[0037] Figure 4 Structure diagram of the refrigeration system in some embodiments of the application;

[0038] Figure 5 Pressure-enthalpy diagram of the refrigeration system in some embodiments of the application;

[0039] Figure 6 Flowchart of the multi-stage compression refrigeration method in some embodiments of the application.

[0040] Explanation of reference signs:

[0041] 1000, refrigeration system;

[0042] 100, flash evaporator; 110, main body; 111, reaction cavity; 112, feed inlet; 113, exhaust outlet; 114, liquid discharge outlet; 115, gas-liquid filter screen; 120, muffling assembly; 121, muffling cylinder; 1211, muffling cavity; 122, exhaust pipe; 1221, air hole;

[0043] 200, multi-stage compression device; 210, high-pressure stage compressor; 220, low-pressure stage compressor;

[0044] 300, condenser;

[0045] 400, evaporator;

[0046] 500, throttling element. DETAILED DESCRIPTION

[0047] In order to make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application will be described in detail below with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways other than those described herein without departing from the spirit of the present application, and it is understood that similar improvements can be made by those skilled in the art without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0048] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] In addition, if the term "and / or" appears, "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects. If the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0050] In the present application, unless specifically defined otherwise, if there are terms such as "mount", "connect", "connect", "fix", and the like, these terms should be interpreted in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the present application, unless specifically defined otherwise, if there are terms such as "mount", "connect", "connect", "fix", and the like, these terms should be interpreted in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] It should be noted that if an element is referred to as "fixed to" or "disposed to" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0053] Referring to Figure 1 As shown, the embodiment of the present application provides a flasher 100, which can be used in a refrigerant cycle of an air conditioning refrigeration system 1000, reduces the pressure loss of the refrigeration system 1000, and improves the refrigeration capacity of the refrigeration system 1000.

[0054] Specifically, the flasher 100 includes a main body 110 and a muffler assembly 120, the main body 110 as an evaporation container of refrigerant, reduces the gas flow pressure pulsation through the muffler assembly 120, thereby reducing the pipeline vibration, reducing the exhaust noise, and reducing the pressure loss.

[0055] Continuing to refer to Figure 2As shown, the main body 110 is provided with a reaction cavity 111, a feeding port 112 and an exhaust port 113, and the feeding port 112 and the exhaust port 113 are both in communication with the reaction cavity 111. The feeding port 112 is used to deliver high-pressure liquid refrigerant to the reaction cavity 111, and the high-pressure liquid refrigerant is evaporated to generate refrigerant vapor in the reaction cavity 111. The exhaust port 113 is used to output the refrigerant vapor.

[0056] Specifically, the exhaust port 113 is located above the reaction cavity 111, and the feeding port 112 can be arranged on the side of the reaction cavity 111. When the high-pressure liquid refrigerant enters the reaction cavity 111 through the feeding port 112, the pressure in the reaction cavity 111 is much lower than that of the liquid refrigerant, and the liquid refrigerant is evaporated by decompression to generate refrigerant vapor in the reaction cavity 111. Then, the refrigerant vapor enters the external compressor through the exhaust port 113 to perform a compression cycle and realize the circulation of the refrigerant.

[0057] It can be understood that the boiling point of a substance increases with the increase of pressure and decreases with the decrease of pressure, so that the high-pressure liquid refrigerant is decompressed to reduce its boiling point and enter the flash evaporator 100. At this time, the temperature of the liquid refrigerant is higher than the boiling point under the pressure, the refrigerant fluid is rapidly boiled and vaporized in the flash tank, and gas-liquid separation is performed.

[0058] Further, the main body 110 is also provided with a liquid discharge port 114 arranged at the lower end of the main body 110 in the direction of gravity.

[0059] Specifically, after the refrigerant is evaporated, part of the refrigerant vapor is cooled and liquefied again. The liquid refrigerant is gathered at the lower end of the main body 110 under the action of gravity, and then is discharged through the lower liquid discharge port 114 to perform the next working process.

[0060] Further, the main body 110 is provided with a gas-liquid filter screen 115 arranged at one end of the main body 110 provided with the exhaust port 113 to separate the liquid refrigerant and the gaseous refrigerant in the flash evaporator 100. In addition, the gas-liquid filter screen 115 can also enhance the disturbance of the refrigerant, rapidly evaporate, and at the same time avoid the liquid refrigerant in the flash evaporator 100 from being carried by the gas flow during the air charging process.

[0061] In some embodiments, the sound attenuation assembly 120 is mounted at one end of the exhaust port 113 of the main body 110 to reduce the gas flow pressure pulsation at the exhaust port 113.

[0062] Specifically, the exhaust port 113 is connected with the external compressor through a pipeline, and when the refrigerant vapor is output to the compressor through the exhaust port 113, the sound attenuation assembly 120 can effectively reduce the gas flow pressure pulsation before the refrigerant vapor enters the compressor, and at the same time reduce the pipeline vibration, thereby reducing the noise.

[0063] Further, the noise elimination assembly 120 comprises a noise elimination cylinder 121, and a plurality of noise elimination cavities 1211 are arranged in the noise elimination cylinder 121, and each noise elimination cavity 1211 is distributed along the axis of the noise elimination cylinder 121 and is in communication with the exhaust port 113.

[0064] Specifically, the noise elimination cylinder 121 is in a cylindrical structure, and both ends are in a through state to communicate with the exhaust port 113 and absorb the noise generated in the process of conveying the refrigerant vapor. The number of noise elimination cavities 1211 can be two, three, four, five, etc., and can be set according to actual needs. It can be understood that the noise elimination cylinder 121 is sleeved outside the exhaust port 113, and the interface size of each noise elimination cavity 1211 is greater than the aperture of the exhaust port 113. By arranging each noise elimination cavity 1211 in a vertical direction in sequence, in the process of noise propagation, due to the change of the cross section of the channel, part of the sound is emitted in the direction of the sound source, thereby reducing the exhaust noise of the refrigerant vapor.

[0065] Further, the noise elimination assembly 120 further comprises an exhaust pipe 122, which is coaxially arranged with the noise elimination cylinder 121 and is connected with the exhaust port 113 at one end. The exhaust pipe 122 is provided with a plurality of air holes 1221 on the side, and the noise elimination cylinder 121 is sleeved outside the exhaust pipe 122, and each noise elimination cavity 1211 is in communication with the corresponding air hole 1221.

[0066] Specifically, the exhaust pipe 122 is in a circular pipe structure, and the noise elimination cylinder 121 is sleeved outside the exhaust pipe 122 and makes each noise elimination cavity 1211 in communication with the corresponding air hole 1221, so that the refrigerant vapor enters the noise elimination cavity 1211 from the air hole 1221 and then returns to the exhaust pipe 122 for exhaust, and the air holes 1221 of the exhaust pipe 122 change the propagation of sound, further improving the noise elimination effect.

[0067] Further, each air hole 1221 is distributed along the axis of the exhaust pipe 122 and sequentially forms a plurality of air hole arrays, and the apertures of the air holes 1221 and the spacing between adjacent two air holes 1221 in different air hole arrays are different.

[0068] Specifically, each air hole array comprises a plurality of air holes 1221 arranged around the side of the exhaust pipe 122, and each air hole 1221 is arranged in a ring shape. In different air hole arrays, the apertures of the air holes 1221 and the density are different, so as to adjust the number and density of the air holes 1221 according to different pulsating airflow intensity, and further improve the noise elimination effect.

[0069] Referring to Figure 4 The embodiment of the present application also provides a refrigeration system 1000, which comprises the flash evaporator 100 in any of the above embodiments.

[0070] The embodiment has the flasher 100 in any of the above embodiments, and thus has all the advantages of the flasher 100 in any of the above embodiments, which will not be repeated here.

[0071] Further, the refrigeration system 1000 further comprises a multi-stage compression device 200 and a condenser 300, the multi-stage compression device 200 comprising a high-pressure stage compressor 210, an output end of the high-pressure stage compressor 210 being connected with an input end of the condenser 300, an output end of the condenser 300 being connected with the feed port 112 of the flasher 100, and an exhaust port 113 of the flasher 100 being connected with an input end of the high-pressure stage compressor 210.

[0072] Specifically, the condenser 300 delivers high-pressure liquid refrigerant to the flasher 100, the liquid refrigerant enters the low-pressure flasher 100 after pressure regulation, and rapidly evaporates to generate low-pressure refrigerant vapor. The low-pressure refrigerant vapor enters the high-pressure stage compressor 210 through the exhaust port 113, is compressed into high-pressure refrigerant gas, and then the high-pressure refrigerant gas is delivered to the condenser 300 to form high-pressure liquid refrigerant, realizing the recycling use of the refrigerant.

[0073] Still further, the refrigeration system 1000 further comprises an evaporator 400, and the multi-stage compression device 200 comprises a low-pressure stage compressor 220, an input end of the evaporator 400 being connected with a liquid discharge port 114 of the flasher 100, an output end of the evaporator 400 being connected with an input end of the low-pressure stage compressor 220, and an output end of the low-pressure stage compressor 220 being communicated with the high-pressure stage compressor 210.

[0074] Referring to Figure 5 Specifically, part of the refrigerant vapor will be cooled to generate low-temperature liquid refrigerant in the flasher 100, so as to deliver the liquid refrigerant to the evaporator 400. The evaporator 400 evaporates the liquid refrigerant to generate low-pressure refrigerant vapor, and then the low-pressure refrigerant vapor is double-compressed by the low-pressure stage compressor 220 and the high-pressure stage compressor 210 to form high-pressure refrigerant vapor, which is condensed by the condenser 300 to enter the flasher 100 again. In this way, the enthalpy difference of the main circuit refrigerant in the refrigeration system 1000 is increased, the refrigeration capacity per unit mass of the compressor is improved, and thus the refrigeration capacity of the refrigeration system 1000 is improved. The problems of insufficient refrigeration capacity, performance coefficient reduction, excessively high exhaust temperature, and compressor unable to normally operate in the related art are solved.

[0075] Still further, a throttling element 500 is arranged between the condenser 300 and the flasher 100 and between the flasher 100 and the evaporator 400, and the throttling element 500 is used for controlling the flow rate of the fluid in the refrigeration system 1000, so as to adjust the delivery rate of the fluid and change the delivery pressure of the fluid through the throttling element 500.

[0076] The throttling element 500 can be a throttling orifice installed in the pipeline to regulate the delivery of the refrigerant, so that the high-pressure liquid refrigerant is regulated by the throttling element 500 to evaporate into refrigerant vapor in the flash evaporator 100. The throttling element 500 can be an electronic expansion valve to automatically regulate the pressure of the refrigerant.

[0077] Referring to Figure 6 As shown, the embodiments of the present application also provide a multi-stage compression refrigeration method using the flash evaporator 100 or the refrigeration system 1000 of any of the above embodiments.

[0078] The multi-stage compression refrigeration method comprises:

[0079] S10, the flash evaporator 100 receives the high-pressure liquid refrigerant from the condenser 300 through the feed port 112.

[0080] Specifically, the refrigerant vapor is compressed by the high-pressure stage compressor 210 and enters the condenser 300 in a high-pressure state, thereby increasing the boiling point of the refrigerant to facilitate the liquefaction of the refrigerant vapor while maintaining the liquid state of the refrigerant to ensure stable delivery of the refrigerant.

[0081] S20, the high-pressure liquid refrigerant rapidly evaporates in the low-pressure reaction chamber 111 to generate refrigerant vapor.

[0082] Specifically, the high-temperature liquid refrigerant is reduced in pressure by the throttling element 500, and its boiling point is reduced to rapidly evaporate inside the low-pressure flash evaporator 100 to generate refrigerant vapor.

[0083] S30, part of the refrigerant vapor enters the input end of the high-pressure stage compressor 210 through the exhaust port 113, and part of the refrigerant vapor is cooled to form saturated liquid refrigerant, which enters the evaporator 400 through the liquid outlet 114.

[0084] Specifically, during the evaporation of the refrigerant, there will inevitably be a gas-liquid coexistence state, and part of the refrigerant vapor will be re-condensed into saturated liquid refrigerant after being cooled. The gas-liquid filter screen 115 separates the gas flow and the liquid to prevent the gas from entraining the liquid refrigerant. Finally, the low-pressure refrigerant vapor supplies cold to the system and then returns to the high-pressure stage compressor 210 for pressurization. The saturated liquid refrigerant enters the evaporator 400 to evaporate again to form vapor, thereby increasing the enthalpy difference of the refrigerant in the refrigeration system 1000.

[0085] S40, the refrigerant vapor entering the high-pressure stage compressor 210 is compressed and then enters the condenser 300 again to condense into high-pressure liquid refrigerant and be input to the flash evaporator 100 again.

[0086] Specifically, the high-pressure stage compressor 210 re-compresses the refrigerant vapor to form high-pressure refrigerant vapor, increases the boiling point of the refrigerant, and after condensation in the condenser 300, is input into the flash tank 100 again to complete the circulation of the refrigerant.

[0087] S50, the saturated liquid refrigerant entering the evaporator 400 is evaporated to form low-pressure refrigerant vapor, which enters the low-pressure stage compressor 220 for primary compression, then enters the high-pressure stage compressor 210 for secondary compression, and is transported to the condenser 300 and finally returns to the flash tank 100.

[0088] Specifically, the saturated liquid refrigerant entering the evaporator 400 is evaporated to form low-pressure refrigerant vapor, which enters the low-pressure stage compressor 220 for primary compression, then enters the high-pressure stage compressor 210 for secondary compression, and is transported to the condenser 300 and finally returns to the flash tank 100.

[0089] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0090] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be noted that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A flash generator, characterized in that, include: The main body is provided with a reaction chamber, a feed inlet and an exhaust port. The feed inlet and the exhaust port are both connected to the reaction chamber. The feed inlet is used to deliver high-pressure liquid refrigerant to the reaction chamber. The high-pressure liquid refrigerant evaporates in the reaction chamber to generate refrigerant vapor. The exhaust port is used to output the refrigerant vapor. A noise reduction assembly is installed at one end of the exhaust port of the main body to reduce airflow pressure pulsation at the exhaust port; The silencing assembly includes a silencing cylinder, which has multiple silencing chambers. Each silencing chamber is distributed along the axis of the silencing cylinder and communicates with the exhaust port. The muffler assembly also includes an exhaust pipe, which is coaxially arranged with the muffler and one end is connected to the exhaust port. The exhaust pipe has multiple air holes on its periphery. The muffler is sleeved on the outside of the exhaust pipe, and each of the muffler chambers is distributed and communicates with the corresponding air holes.

2. The flash generator according to claim 1, characterized in that, Each of the air holes is distributed along the axis of the exhaust pipe and forms multiple air hole arrays in sequence. The diameter of the air holes and the spacing between two adjacent air holes are different in different air hole arrays.

3. The flash generator according to claim 1, characterized in that, The main body is also provided with a drain outlet, which is located at the lower end of the main body in the direction of gravity.

4. The flash generator according to claim 3, characterized in that, The main body is provided with a gas-liquid filter screen, which is located at the end of the main body where the exhaust port is located.

5. A refrigeration system, characterized in that, The device includes a flash evaporator, a multi-stage compression device, and a condenser as described in any one of claims 1 to 4. The multi-stage compression device includes a high-pressure stage compressor. The output end of the high-pressure stage compressor is connected to the input end of the condenser. The output end of the condenser is connected to the feed port of the flash evaporator. The exhaust port of the flash evaporator is connected to the input end of the high-pressure stage compressor.

6. The refrigeration system according to claim 5, characterized in that, The refrigeration system also includes an evaporator, the multi-stage compression device includes a low-pressure stage compressor, the input end of the evaporator is connected to the drain port of the flash evaporator, the output end of the evaporator is connected to the input end of the low-pressure stage compressor, and the output end of the low-pressure stage compressor is connected to the high-pressure stage compressor.

7. The refrigeration system according to claim 6, characterized in that, Throttling elements are provided between the condenser and the flash evaporator, and between the flash evaporator and the evaporator, and the throttling elements are used to control the fluid flow rate in the refrigeration system.

8. A multi-stage compression refrigeration method, characterized in that, The multi-stage compression refrigeration method, employing the flash generator of any one of claims 1 to 4 or the refrigeration system of any one of claims 5 to 7, comprises: The flash evaporator receives the high-pressure liquid refrigerant from the condenser via the feed port; The high-pressure liquid refrigerant evaporates rapidly in the low-pressure reaction chamber to produce refrigerant vapor; A portion of the refrigerant vapor enters the input end of the high-pressure stage compressor through the exhaust port, and a portion of the refrigerant vapor cools down to form saturated liquid refrigerant, which then enters the evaporator through the drain port. The refrigerant vapor entering the high-pressure stage compressor is compressed and then re-enters the condenser to condense into the high-pressure liquid refrigerant, which is then fed back into the flash evaporator. The saturated liquid refrigerant entering the evaporator evaporates to form low-pressure refrigerant vapor. The low-pressure refrigerant vapor enters the low-pressure stage compressor for initial compression, then enters the high-pressure stage compressor for secondary compression, and is delivered to the condenser, and finally returns to the flash evaporator.

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