Energy-saving and high-efficiency refrigeration unit and process

Abstract

The present invention relates to an energy-saving and high-efficiency refrigeration unit and process, and belongs to the technical field of refrigeration equipment. The refrigeration unit includes a generator, a condenser, an absorber and an evaporator. The condenser is connected to a shunt pressure-reducing pipeline, which introduces liquid refrigerant into the absorber and the evaporator in two ways. A solution pump is provided between the rich liquid outlet of the absorber and the rich liquid inlet of the generator, and an ejector is provided on the pipeline between the lean liquid inlet of the absorber and the lean liquid outlet of the generator. The present invention divides the refrigerant formed in the condenser into two ways and reduces the pressure, one of which is used as a cold source for the absorber, which replaces the circulating water. It absorbs heat outside the tube of the absorber to produce pool boiling and phase change. The efficiency of its heat transfer will be greatly improved, which can improve the refrigeration efficiency. Moreover, as a liquid refrigerant produced by the unit, it has a stable temperature and is minimally affected by the high temperature in summer, and can be recycled.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration equipment, and in particular relates to an energy-saving and high-efficiency refrigeration unit and process. Background Art

[0002] Absorption refrigeration unit is a kind of equipment that uses low-grade waste heat to drive thermal working fluid and realizes refrigeration through phase change of working fluid. It is widely used in industrial production and waste heat recovery. Its core operating principle is based on thermal cycle. Through the synergistic effect of components such as generator, condenser, evaporator, absorber, etc., the working fluid is circulated from gas to liquid and then to gas. In actual application, although traditional absorption refrigeration unit has realized the refrigeration function, it still has the following technical bottlenecks:

[0003] 1) Limited absorption efficiency. As the core equipment of the refrigeration unit, the absorption efficiency of the absorber directly affects the overall refrigeration performance. However, the traditional absorber uses circulating water as the cold source, and the absorbed heat is only transferred in the form of sensible heat, without a phase change process, and the efficiency is low. Especially in summer, the circulating water temperature is high, and the heat transfer temperature difference between the circulating water and the absorption liquid is further reduced, resulting in a decrease in absorption efficiency, which restricts the overall performance of the unit;

[0004] 2) Energy waste of high-pressure lean liquid decompression

[0005] In traditional designs, high-pressure lean liquid is throttled and reduced in pressure to low-pressure lean liquid through a pressure reducing valve. In this process, energy is not effectively utilized, entropy increase leads to a decrease in working capacity, and the pressure-raising burden of subsequent solution pumps is increased, indirectly increasing energy consumption.

[0006] 3) Insufficient utilization of the unit’s self-cooling capacity

[0007] The low-pressure and low-temperature gaseous refrigerant discharged from the evaporator contains a certain amount of cold capacity, but this part of the cold capacity has not been fully utilized in traditional designs, resulting in energy waste. If it can be used in the cooling process of the absorber, it can not only improve the absorption efficiency, but also realize the recycling of energy within the unit, further improving energy efficiency.

[0008] 4) Poor adaptability of unit structure

[0009] Most refrigeration units in the current market are horizontal structures, occupying a large area, and are difficult to adapt to the needs of some projects with limited space. How to integrate the units into vertical equipment through structural optimization to meet space constraints while maintaining the high efficiency of the equipment is a technical problem that needs to be solved urgently. Summary of the invention

[0010] The purpose of the present invention is to provide an energy-saving and high-efficiency refrigeration unit and process in order to solve the above problems.

[0011] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0012] An energy-saving and high-efficiency refrigeration unit comprises a generator, a condenser, an absorber and an evaporator, wherein the liquid refrigerant outlet of the condenser is connected with a splitting and reducing-pressure pipeline, and the splitting and reducing-pressure pipeline is used to split the liquid refrigerant into two paths, which enter the absorber and the evaporator respectively;

[0013] Both sides of the shunt pressure reducing pipeline are provided with expansion valves, a solution pump is provided between the rich liquid outlet of the absorber and the rich liquid inlet of the generator, and an ejector is provided on the pipeline between the lean liquid inlet of the absorber and the lean liquid outlet of the generator. The ejector uses high-pressure lean liquid as an ejection source to eject the low-pressure gaseous refrigerant that has absorbed heat and vaporized as a cold source in the absorber and the low-pressure normal-temperature gaseous refrigerant that has recovered cold from the evaporator. The three are partially adiabatically absorbed in the ejector to become a medium-pressure gas-liquid mixture, which enters the absorber to be cooled and cooled, and continues to be absorbed to become a medium-pressure rich liquid, which is sent to the solution pump to continue the cycle.

[0014] As a further optimization scheme of the present invention, it includes a vertical ejector evaporation absorber and a vertical generator condenser, wherein the vertical generator condenser is used to replace the generator and the condenser, and the vertical ejector evaporation absorber is used to replace the evaporator, the absorber and the ejector;

[0015] The cylinder of the vertical generator condenser is provided with a generator section and a condensation section in sequence from bottom to top, and the cylinder of the vertical ejector evaporator absorber is provided with an evaporation section and an absorption section in sequence from bottom to top, the liquid refrigerant outlet of the condensation section is connected to the refrigerant inlet of the absorption section and the evaporation section respectively, the rich liquid outlet of the absorption section is connected to the rich liquid inlet of the generator section, and the generator section, condensation section, absorption section and evaporation section are respectively equipped with a plurality of vertical heat exchange tubes;

[0016] The top end of the heat exchange tube of the generating section is connected with the bottom end of the heat exchange tube of the condensing section through chamber one, the top end of the heat exchange tube of the evaporating section is connected with the bottom end of the heat exchange tube of the absorbing section through chamber two, and an ejector assembly is provided on the lean liquid inlet at the top of the absorbing section, and the ejector assembly is arranged between the lean liquid inlet at the top of the absorbing section and the lean liquid outlet at the bottom of the generating section.

[0017] As a further optimization scheme of the present invention, the heat exchange tubes of the generating section and the evaporating section are both single straight tubes, and the heat exchange tubes of the condensing section and the absorbing section are both sleeve tubes, which are composed of an inner tube and an outer tube.

[0018] As a further optimization scheme of the present invention, the absorption section includes a drainage chamber, an absorption chamber, a collection chamber and a gas collection chamber which are separated from bottom to top by a plurality of tube sheets, and the collection chamber is provided with a liquid collection box;

[0019] The upper and lower outlets of the inner tube of the heat exchange tube of the absorption section are respectively connected to the gas collecting chamber and the second chamber, and the upper and lower outlets of the outer tube of the heat exchange tube are respectively connected to the collection chamber and the liquid discharge chamber.

[0020] As a further optimization scheme of the present invention, the condensation section includes a drainage chamber, a condensation chamber and a reflux chamber arranged in sequence from bottom to top;

[0021] The upper and lower outlets of the inner tube of the heat exchange tube of the condensing section are respectively connected to the reflux chamber and chamber one, and the upper and lower outlets of the outer tube of the heat exchange tube are respectively connected to the reflux chamber and the discharge chamber, and the upper outlet of the inner tube is higher than the upper inlet of the outer tube;

[0022] The liquid refrigerant outlet of the discharge chamber of the condensing section is connected to a shunt pressure reducing pipeline, and the two routes of the shunt pressure reducing pipeline are respectively connected to the absorption section and the evaporation section. The solution pump is arranged between the rich liquid outlet of the absorption section and the rich liquid inlet of the generating section.

[0023] As a further optimization scheme of the present invention, the ejection assembly includes a diffuser tube, a buffer tube, a reducing tube, a mixing chamber, and an air intake chamber which are sequentially connected to the liquid collection box, and the air intake chamber is provided with a nozzle section, a reducing section and a straight pipe section, and the air intake chamber is respectively connected to the absorption chamber and the gas collecting chamber.

[0024] As a further optimization scheme of the present invention, the generating section and the evaporating section both include three chambers separated by two tube sheets, the heat exchange tube is located in the middle chamber, and the heat exchange tube connects the upper and lower chambers.

[0025] An energy-saving and efficient refrigeration process comprises the following steps:

[0026] The heat source and high-pressure rich liquid are introduced into the generator, and the high-pressure rich liquid replaces the heat in the heat source and decomposes into high-pressure lean liquid and high-pressure gaseous refrigerant, completing the heat exchange in the generator section;

[0027] The high-pressure gaseous refrigerant in the generator enters the condenser, and circulating water is introduced into the condenser. The circulating water replaces the heat in the high-pressure gaseous refrigerant to form high-pressure liquid refrigerant, completing the heat exchange in the condensation section.

[0028] The high-pressure liquid refrigerant in the condenser is decompressed by the shunt pressure reducing pipeline and is divided into two paths, forming a low-pressure and low-temperature liquid refrigerant and a low-pressure liquid refrigerant. The low-pressure and low-temperature liquid refrigerant enters the evaporator, replaces the heat in the refrigerant in the evaporator, forms a low-pressure and low-temperature gaseous refrigerant, and completes the heat exchange in the evaporation section;

[0029] After the low-pressure and low-temperature gaseous refrigerant in the evaporator and the low-pressure liquid refrigerant in the bypass pressure reducing pipeline enter the absorber, they displace the heat generated in the process of enriching the refrigerant in the absorber, and form low-pressure normal-temperature gaseous refrigerant and low-pressure gaseous refrigerant, completing the heat exchange in the absorption section;

[0030] The high-pressure lean liquid in the generator enters the ejector, and the ejector extracts low-pressure room-temperature gaseous refrigerant and low-pressure gaseous refrigerant from the absorber. The high-pressure lean liquid is mixed with the low-pressure room-temperature gaseous refrigerant and the low-pressure gaseous refrigerant to form a medium-pressure gas-liquid mixture, and enters the absorber. The medium-pressure gas-liquid mixture forms a medium-pressure rich liquid in the absorber. The solution pump extracts the medium-pressure rich liquid from the absorber to form a high-pressure rich liquid. The high-pressure rich liquid enters the generator under the action of the solution pump.

[0031] Another energy-saving and efficient refrigeration process includes the following steps:

[0032] The heat source and high-pressure rich liquid are introduced into the generating section. The high-pressure rich liquid replaces the heat in the heat source in the heat exchange tube of the generating section and decomposes into high-pressure lean liquid and high-pressure gaseous refrigerant. The high-pressure gaseous refrigerant in the generating section enters the heat exchange tube in the condensing section. Circulating water is introduced into the condensing section. The circulating water replaces the heat in the high-pressure gaseous refrigerant to form high-pressure liquid refrigerant.

[0033] The high-pressure liquid refrigerant in the condensing section is decompressed by the shunt pressure reducing pipeline and is divided into two paths, forming a low-pressure low-temperature liquid refrigerant and a low-pressure liquid refrigerant. The low-pressure low-temperature liquid refrigerant enters the heat exchange tube of the evaporating section, displaces the heat of the refrigerant in the evaporating section, and forms a low-pressure low-temperature gaseous refrigerant. After the low-pressure low-temperature gaseous refrigerant in the evaporating section and the low-pressure liquid refrigerant in the shunt pressure reducing pipeline enter the absorption section, they displace the heat generated in the process of enriching the refrigerant in the absorption section, and form a low-pressure normal-temperature gaseous refrigerant and a low-pressure gaseous refrigerant.

[0034] After the high-pressure lean liquid in the generating section enters the ejector assembly, the ejector assembly extracts low-pressure room-temperature gaseous refrigerant and low-pressure gaseous refrigerant from the absorption section, and the high-pressure lean liquid is mixed with the low-pressure room-temperature gaseous refrigerant and the low-pressure gaseous refrigerant to form a medium-pressure gas-liquid mixture, and enters the absorption section. The medium-pressure gas-liquid mixture forms a medium-pressure rich liquid in the absorption section, and the solution pump extracts the medium-pressure rich liquid from the absorption section to form a high-pressure rich liquid. The high-pressure rich liquid enters the generating section under the action of the solution pump.

[0035] The beneficial effects of the present invention are:

[0036] The present invention divides the refrigerant formed in the condenser into two paths and reduces the pressure. One path is used as the cold source of the absorber, which replaces the circulating water. It absorbs heat outside the tube of the absorber to produce pool boiling, undergoes phase change, and becomes a low-pressure gaseous refrigerant. Its heat transfer efficiency will be greatly improved, thereby improving the refrigeration efficiency. Moreover, as the liquid refrigerant produced by the unit, its temperature is stable and is minimally affected by the high temperature in summer. The low-pressure gaseous refrigerant after the phase change is then introduced into the absorber to be absorbed and can be continuously recycled, which not only improves the heat exchange rate, but also saves the layout of the circulating water related pipelines.

[0037] The present invention replaces the pressure reducing valve with an ejector, uses the high-pressure lean liquid as an ejection source, ejects the low-pressure gaseous refrigerant and the low-pressure normal-temperature gaseous refrigerant in the absorber, and the three undergo adiabatic absorption in the ejector, and form a medium-pressure rich liquid in the absorber. Due to the arrangement of the ejector, the absorption pressure is increased, the absorption efficiency is improved, and the medium-pressure rich liquid is formed after absorption, which can reduce the load of the subsequent solution pump to increase the pressure and send it to the generator, save the electric energy required by the solution pump, and reduce the energy consumption of the unit;

[0038] The inner tube of the absorption section of the present invention penetrates the outer tube of the absorption section. Under the action of the ejector, the refrigerant flows upward along the inner tube of the absorption section and cooperates with the refrigerant on the outer side of the outer tube of the absorption section to cool the gas-liquid mixture. The residual cold contained in the low-pressure and low-temperature gaseous refrigerant is used to cool the absorber, which not only improves the absorption efficiency, but also makes full use of the energy inside the unit.

[0039] The present invention integrates all the equipment in the improved high-efficiency refrigeration process into two vertical devices, a solution pump and a plurality of pipelines, thereby reducing the cost of equipment and pipelines. The unit structure is very compact, which greatly reduces the unit's footprint and solves the problem of limited space in the projects that have been put into production. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is an energy-saving and high-efficiency refrigeration process flow chart of the present invention;

[0041] Figure 2 It is another energy-saving and high-efficiency refrigeration process flow chart of the present invention;

[0042] Figure 3 It is a schematic diagram of the working state of the energy-saving and high-efficiency refrigeration unit of the present invention;

[0043] Figure 4 It is a schematic diagram of the structure of the ejection component of the present invention.

[0044] In the figure: 1, generating section; 2, condensing section; 3, absorbing section; 4, evaporating section; 5, diversion pressure reducing pipeline; 6, solution pump; 7, ejector assembly; 11, liquid collecting chamber; 12, generating chamber; 13, chamber one; 14, generating section tube sheet; 15, generating section heat exchange tube; 16, generating section baffle; 21, discharge chamber; 22, condensing chamber; 23, reflux chamber; 24, first tube sheet of condensing section; 25, second tube sheet of condensing section; 26, inner tube of condensing section; 27, outer tube of condensing section; 28, baffle of condensing section; 31, discharge chamber; 32, absorbing chamber; 33, collecting chamber; 34, gas collecting chamber; 35, first tube sheet of absorbing section; 36, second tube sheet of absorbing section; 37, inner tube of absorbing section; 38, outer tube of absorbing section; 39, liquid collecting box; 41. Liquid accumulation chamber; 42. Evaporation chamber; 43. Chamber 2; 44. Evaporation section tube sheet; 45. Evaporation section heat exchange tube; 46. Evaporation section baffle; 71. Air inlet chamber; 72. Straight pipe section; 73. Variable diameter section; 74. Nozzle section; 75. Mixing chamber; 76. Reduced diameter pipe; 77. Buffer pipe; 78. Diffuser; D. Liquid distributor; V. Air vent; H. Heat source; W. Circulating water; C. Coolant; R1. High pressure gaseous refrigerant; R2. High pressure liquid refrigerant; R3. Low pressure and low temperature liquid refrigerant; R4. Low pressure liquid refrigerant; R5. Low pressure and low temperature gaseous refrigerant; R6. Low pressure and normal temperature gaseous refrigerant; R7. Low pressure gaseous refrigerant; M. Medium pressure gas-liquid mixture; L1. High pressure rich liquid; L2. High pressure lean liquid; L3. Medium pressure rich liquid. DETAILED DESCRIPTION

[0045] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0046] Example 1

[0047] like Figure 1 As shown, the present embodiment relates to an energy-saving and high-efficiency refrigeration unit, including a generator for decomposing a rich liquid and generating a refrigerant and a lean liquid, and a condenser for cooling the refrigerant, the lean liquid outlet of the generator is connected to an absorber for enriching the refrigerant, and one end of the absorber is connected to an evaporator for reducing the temperature of the coolant, and the liquid refrigerant outlet of the condenser is connected to a shunt pressure reducing pipeline, which is used to divide the liquid refrigerant into two paths, so that the two paths of liquid refrigerant can enter the absorber and the evaporator respectively.

[0048] The two routes of the shunt pressure reducing pipeline are respectively provided with expansion valve A and expansion valve B, a solution pump is provided between the rich liquid outlet of the absorber and the rich liquid inlet of the generator, an ejector is provided on the pipeline between the lean liquid inlet of the absorber and the lean liquid outlet of the generator, the ejector uses the high-pressure lean liquid as an ejection source, and ejects the low-pressure gaseous refrigerant after absorbing heat and vaporizing as a cold source in the absorber and the low-pressure normal-temperature gaseous refrigerant after the cold is recovered by the absorber after coming out of the evaporator. The three are partially adiabatically absorbed in the ejector and become a medium-pressure gas-liquid mixture, which enters the absorber to be cooled and cooled, and continues to be absorbed to become a medium-pressure rich liquid, which is sent to the solution pump to continue the cycle.

[0049] An energy-saving and efficient refrigeration process of the refrigeration unit based on this embodiment is as follows, and its operation process includes the following four heat exchange steps:

[0050] (1) During the operation of the generator, the heat source and high-pressure rich liquid are introduced into the generator, and the high-pressure rich liquid is used to replace the heat in the heat source. The high-pressure rich liquid is decomposed into high-pressure lean liquid and high-pressure gaseous refrigerant, completing the heat exchange in the generator section.

[0051] (2) During the operation of the condenser, the high-pressure gaseous refrigerant in the generator enters the condenser, and circulating water is introduced into the condenser. The heat in the high-pressure gaseous refrigerant is replaced by the circulating water to form a high-pressure liquid refrigerant, completing the heat exchange in the condensation section;

[0052] (3) During the operation of the evaporator, the high-pressure liquid refrigerant in the condenser is decompressed by the bypass pressure reducing pipeline and then divided into two paths. The two paths of refrigerant are throttled and decompressed by expansion valve A and expansion valve B respectively to form low-pressure and low-temperature liquid refrigerant and low-pressure liquid refrigerant. The low-pressure and low-temperature liquid refrigerant enters the evaporator, displaces the heat in the refrigerant in the evaporator, and forms a low-pressure and low-temperature gaseous refrigerant, completing the heat exchange in the evaporation section.

[0053] (4) During the operation of the absorber, the low-pressure and low-temperature gaseous refrigerant in the evaporator and the low-pressure liquid refrigerant in the bypass pressure reducing pipeline enter the absorber, displacing the heat generated in the process of enriching the refrigerant in the absorber, and forming low-pressure room-temperature gaseous refrigerant and low-pressure gaseous refrigerant, completing the heat exchange in the absorption section.

[0054] Among them, during the operation of the absorber, the high-pressure lean liquid in the generator enters the ejector, the ejector extracts low-pressure room-temperature gaseous refrigerant and low-pressure gaseous refrigerant from the absorber, the high-pressure lean liquid is mixed with the low-pressure room-temperature gaseous refrigerant and the low-pressure gaseous refrigerant to form a medium-pressure gas-liquid mixture, and enters the absorber, the medium-pressure gas-liquid mixture forms a medium-pressure rich liquid in the absorber, the solution pump extracts the medium-pressure rich liquid from the absorber to form a high-pressure rich liquid, and the high-pressure rich liquid enters the generator under the action of the solution pump.

[0055] Example 2

[0056] like Figure 2-4 As shown, this embodiment relates to another energy-saving and high-efficiency refrigeration unit, which includes a vertical ejector evaporative absorber and a vertical generator condenser. The vertical generator condenser is used to replace the generator and the condenser, and can decompose the rich liquid and cool the refrigerant. The refrigerant is preferably ammonia. The vertical ejector evaporative absorber is used to replace the evaporator, absorber and ejector, and can convert the lean liquid into the rich liquid, and use the refrigerant to replace the heat of the coolant C.

[0057] The cylinder of the vertical generator condenser is provided with a generator section 1 and a condenser section 2 from bottom to top, and the cylinder of the vertical ejector evaporator absorber is provided with an evaporator section 4 and an absorber section 3 from bottom to top. The liquid refrigerant outlet of the condenser section 2 is connected to the refrigerant inlets of the absorber section 3 and the evaporator section 4 respectively, and the rich liquid outlet of the absorber section 3 is connected to the rich liquid inlet of the generator section 1. The generator section 1, the condenser section 2, the absorber section 3 and the evaporator section 4 are respectively built with a plurality of vertical heat exchange tubes. A diversion pressure reducing pipeline 5 is provided between the liquid refrigerant outlet of the condenser section 2 and the refrigerant inlets of the absorber section 3 and the evaporator section 4, and a solution pump 6 is provided between the rich liquid outlet of the absorber section 3 and the rich liquid inlet of the generator section 1.

[0058] The top of the generating section 1 has a chamber 13, and the top of the evaporating section 4 has a chamber 2 43, the top of the heat exchange tube of the generating section 1 is connected with the bottom of the heat exchange tube of the condensing section 2 through the chamber 13, the top of the heat exchange tube of the evaporating section 4 is connected with the bottom of the heat exchange tube of the absorbing section 3 through the chamber 2 43, and the lean liquid inlet at the top of the absorbing section 3 is provided with an ejector assembly 7, and the ejector assembly 7 is arranged between the lean liquid inlet at the top of the absorbing section 3 and the lean liquid outlet at the bottom of the generating section 1.

[0059] During the operation of the unit, the generating section 1 decomposes the high-pressure rich liquid L1 pumped by the solution pump 6 through the heat exchange tube inside it, and generates high-pressure gaseous refrigerant R1 and high-pressure lean liquid L2. When decomposing the high-pressure rich liquid L1, the heat source H is introduced into the generating section 1. The condensing section 2 cools the high-pressure gaseous refrigerant R1 through the heat exchange tube inside it to form high-pressure liquid refrigerant R2. When cooling the high-pressure gaseous refrigerant R1, circulating water W is introduced into the condensing section 2. The lean liquid outlet of the generating section 1 is connected to the absorbing section 3 for enriching the refrigerant, and the high-pressure lean liquid L2 can be delivered to the absorbing section 3.

[0060] The liquid refrigerant outlet of the condensing section 2 is connected to the liquid refrigerant outlet of the heat exchange tube in the condensing section 2, and the high-pressure liquid refrigerant R2 can be introduced into the shunt pressure reducing pipeline 5, on which the expansion valve A and the expansion valve B are provided. The shunt pressure reducing pipeline 5 is used to divide the high-pressure liquid refrigerant R2 into two paths, namely, the low-pressure and low-temperature liquid refrigerant R3 and the low-pressure liquid refrigerant R4. These two refrigerants enter the absorption section 3 and the evaporation section 4 respectively, replacing the heat in the absorption section 3 and the evaporation section 4. The low-pressure and low-temperature liquid refrigerant R3 absorbs heat in the heat exchange tube of the evaporation section 4 and then vaporizes, cooling the refrigerant C and forming a low-pressure and low-temperature gaseous refrigerant R5. After the low-pressure and low-temperature gaseous refrigerant R5 enters the absorption section 3 from the heat exchange tube of the evaporation section 4, it passes through the heat exchange tube of the absorption section 3 upward, uses its residual cold capacity to reduce the temperature of the absorption section 3, and is converted into a low-pressure and normal-temperature gaseous refrigerant R6. The low-pressure liquid refrigerant R4 enters the heat exchange tube of the absorption section 3, absorbs heat, vaporizes, and is converted into the low-pressure gaseous refrigerant R7.

[0061] The lean liquid inlet of the absorption section 3 is provided with an ejector assembly 7, which is used to extract the two-way refrigerant entering the absorption section 3 and the evaporation section 4 from the generation section 1, so that the two-way refrigerant is mixed with the lean liquid generated by the generation section 1 and introduced into the heat exchange tube of the absorption section 3. Specifically, the two-way refrigerant entering the absorption section 3 and the evaporation section 4 is in a gaseous state when being extracted by the ejector assembly 7, and the two are low-pressure normal temperature gaseous refrigerant R6 and low-pressure gaseous refrigerant R7 respectively. The low-pressure normal temperature gaseous refrigerant R6 and the low-pressure gaseous refrigerant R7 are mixed with the high-pressure lean liquid L2 in the ejector assembly 7 to form a medium-pressure gas-liquid mixture M. The medium-pressure gas-liquid mixture M gradually transforms into a medium-pressure rich liquid L3 after entering the heat exchange tube of the absorption section 3. The solution pump 6 extracts the medium-pressure rich liquid L3 from the absorption section 3 to form a high-pressure rich liquid L1. The high-pressure rich liquid L1 enters the generation section 1 under the action of the solution pump 6 to realize the recycling of the refrigerant.

[0062] Specifically, see Figure 3The liquid refrigerant outlet of the condensing section 2 is connected to the refrigerant inlets of the absorbing section 3 and the evaporating section 4 respectively, the rich liquid outlet of the absorbing section 3 is connected to the rich liquid inlet of the generating section 1, and the generating section 1, the condensing section 2, the absorbing section 3 and the evaporating section 4 are all equipped with heat exchange pipes. The absorption section 3 includes a drainage chamber 31, an absorption chamber 32, a collection chamber 33 and a gas collecting chamber 34 which are arranged in sequence from bottom to top. The above chambers are separated by tube sheets. The absorption section 3 also includes a first absorption section tube sheet 35 fixedly arranged at the lower end of the drainage chamber 31 and the upper end of the collection chamber 33, a second absorption section tube sheet 36 fixedly arranged at the upper and lower ends of the absorption chamber 32, a plurality of absorption section inner tubes 37 fixedly arranged between the two absorption section first tube sheets 35, an absorption section outer tube 38 fixedly arranged between the two absorption section second tube sheets 36 and corresponding one-to-one to the absorption section inner tube 37, and a liquid collection box 39 fixedly arranged inside the collection chamber 33. The absorption section outer tube 38 and the absorption section inner tube 37 on its inner side form a casing of the absorption section 3, which is the heat exchange tube of the absorption section 3.

[0063] The liquid collection box 39 is connected to the outlet of the ejector assembly 7 and the inlet of the outer tube 38 of the absorption section. The outlet of the outer tube 38 of the absorption section is connected to the drainage chamber 31. The inlet and outlet of the inner tube 37 of the absorption section are respectively connected to the evaporation section 4 and the gas collection chamber 34. The two second tube sheets 36 of the absorption section seal the upper and lower ends of the absorption chamber 32. The liquid collection box 39 is fixedly arranged on the second tube sheet 36 of the absorption section on the upper side. The two first tube sheets 35 of the absorption section cooperate with the two second tube sheets 36 of the absorption section to seal the drainage chamber 31 and the collection chamber 33. An upper head is fixedly arranged at the upper end of the gas collection chamber 34. The diversion pressure reducing pipeline 5 has two branch pipes respectively connected to the chamber 2 43 and the absorption chamber 32, and the two branch pipes are respectively provided with an expansion valve A and an expansion valve B. The expansion valve A and the expansion valve B are respectively connected to the evaporation section 4 and the absorption section 3, and the expansion valve B is connected to the absorption chamber 32.

[0064] The ejector assembly 7 includes an air inlet chamber 71, a mixing chamber 75 arranged at the outlet of the air inlet chamber 71, a reducing pipe 76 arranged at the outlet of the mixing chamber 75, a buffer pipe 77 arranged at the outlet of the reducing pipe 76, and a diffuser pipe 78 arranged at the outlet of the buffer pipe 77, the diffuser pipe 78 is connected to the liquid collection box 39, a straight pipe section 72 is provided at one end of the air inlet chamber 71, and a nozzle section 74 is provided at the other end of the air inlet chamber 71, the straight pipe section 72 is connected to the lean liquid outlet of the generating section 1, the outlet of the nozzle section 74 is connected to the inlet of the mixing chamber 75, a reducing section 73 is provided between the nozzle section 74 and the straight pipe section 72, and the inner diameter of the inlet of the nozzle section 74 is smaller than the inner diameter of the outlet of the straight pipe section 72, and the nozzle section 74 is connected to the absorption chamber 32 and the gas collecting chamber 34.

[0065] The low-pressure liquid refrigerant R4 in the shunt pressure reducing pipeline 5 enters the absorption section 3 from one side of the absorption chamber 32 and flows upward. The low-pressure liquid refrigerant R4 absorbs heat and boils in the absorption chamber 32 to form a low-pressure gaseous refrigerant R7; the low-pressure and low-temperature liquid refrigerant R3 in the shunt pressure reducing pipeline 5 enters the evaporation section 4 to form a low-pressure liquid refrigerant R4. After the low-pressure liquid refrigerant R4 absorbs heat, it forms a low-pressure and low-temperature gaseous refrigerant R5. The low-pressure and low-temperature gaseous refrigerant R5 enters the absorption section 3 from the lower end inlet of the absorption section inner tube 37 and flows upward. The low-pressure and low-temperature gaseous refrigerant R5 absorbs the heat of the liquid in the absorption section outer tube 38 in the absorption section inner tube 37 to form a low-pressure and normal-temperature gaseous refrigerant R6 in the gas collecting chamber 34.

[0066] The high-pressure lean liquid L2 at the lean liquid outlet of the generating section 1 flows to the straight pipe section 72 through the pipeline between the ejection assembly 7 and the generating section 1, and enters the nozzle section 74 through the reducing section 73. During the flow of the high-pressure lean liquid L2, a negative pressure is formed in the air inlet chamber 71, and the low-pressure normal-temperature gaseous refrigerant R6 and the low-pressure gaseous refrigerant R7 are sucked into the nozzle section 74. The high-pressure lean liquid L2 is mixed with the low-pressure normal-temperature gaseous refrigerant R6 and the low-pressure gaseous refrigerant R7 in the mixing chamber 75 to form a medium-pressure gas-liquid mixture M. The medium-pressure gas-liquid mixture M passes through the buffer tube 77 and the diffuser tube After entering the liquid collecting box 39, it flows from top to bottom along the outer tube 38 of the absorption section. During the flow of the medium-pressure gas-liquid mixture M, the low-pressure liquid refrigerant R4 and the low-pressure and low-temperature gaseous refrigerant R5 that have not entered the ejection assembly 7 absorb the heat in the medium-pressure gas-liquid mixture M in the absorption chamber 32, so that the medium-pressure gas-liquid mixture M is quickly converted into a medium-pressure rich liquid L3. The rich liquid outlet of the absorption section 3 is provided on the side wall of the discharge chamber 31. The medium-pressure rich liquid L3 flows out from the outlet at the lower end of the outer tube 38 of the absorption section, and is converted into a high-pressure rich liquid L1 through the solution pump 6, and returns to the generating section 1.

[0067] Furthermore, if Figure 3 and Figure 4 As shown, the condensation section 2 includes a discharge chamber 21, a condensation chamber 22 and a return chamber 23 arranged in sequence from bottom to top, and the above chambers are separated by tube sheets. The condensation section 2 also includes a first condensation section tube sheet 24 fixedly arranged at the lower end of the discharge chamber 21 and the upper end of the return chamber 23, a second condensation section tube sheet 25 fixedly arranged at the upper and lower ends of the condensation chamber 22, a plurality of condensation section inner tubes 26 fixedly arranged between the two first condensation section tube sheets 24, a condensation section outer tube 27 fixedly arranged between the two second condensation section tube sheets 25 and corresponding to the condensation section inner tube 26, and a plurality of condensation section baffles 28 fixedly arranged on the inner side of the condensation chamber 22 and interlaced with each other. The condensation section outer tube 27 and the condensation section inner tube 26 inside it form a casing of the condensation section 2, which is the heat exchange tube of the condensation section 2.

[0068] The two second tube sheets 25 of the condensing section seal the upper and lower ends of the condensing chamber 22, and the two first tube sheets 24 of the condensing section cooperate with the two second tube sheets 25 of the condensing section to seal the discharge chamber 21 and the reflux chamber 23. The top of the reflux chamber 23 is provided with an upper head. The inlet and outlet of the inner tube 26 of the condensing section are respectively connected with the generating section 1 and the reflux chamber 23. The outlet of the inner tube 26 of the condensing section is a vent hole V provided on the upper side wall of the inner tube 26 of the condensing section, and the vent hole V is located in the reflux chamber 23. The inlet and outlet of the outer tube 27 of the condensing section are respectively connected with the reflux chamber 23 and the discharge chamber 21, and multiple outer tubes 27 of the condensing section penetrate each condensing section baffle 28. The inner tube 37 of the absorption section penetrates the outer tube 38 of the absorption section, and the inner tube 26 of the condensing section penetrates the outer tube 27 of the condensing section. An annular gap is formed between the inner tube 37 of the absorption section and the outer tube 38 of the absorption section, and between the inner tube 26 of the condensing section and the outer tube 27 of the condensing section.

[0069] The generating section 1 includes a liquid collecting chamber 11, a generating chamber 12 and a chamber 13 arranged in sequence from bottom to top, the above chambers are separated by a tube sheet, and the generating chamber 12 is the middle chamber of the generating section 1. The generating section 1 also includes a generating section tube sheet 14 fixedly arranged at the upper and lower ends of the generating chamber 12, and a plurality of generating section heat exchange tubes 15 fixedly arranged between the two generating section tube sheets 14, and the generating section heat exchange tube 15 is a single straight tube, which is the heat exchange tube of the generating section 1.

[0070] The inlet and outlet of the generating section heat exchange tube 15 are connected to the chamber 13 and the liquid collecting chamber 11 respectively. The rich liquid inlet of the generating section 1 is arranged on the side wall of the chamber 13, the inlet of the generating section heat exchange tube 15 is arranged at its upper end, and the outlet of the generating section heat exchange tube 15 is arranged at its lower end. A plurality of mutually staggered generating section baffles 16 are arranged on the inner side of the generating chamber 12, and a plurality of generating section heat exchange tubes 15 pass through each generating section baffle 16. The two generating section tube sheets 14 seal the upper and lower ends of the generating chamber 12. A lower head is arranged at the bottom of the liquid collecting chamber 11, and the lean liquid outlet of the generating section 1 is arranged at the bottom of the lower head of the generating section 1. The discharge chamber 21 is arranged above the chamber 13.

[0071] The evaporation section 4 includes a liquid accumulation chamber 41, an evaporation chamber 42 and a second chamber 43 arranged in sequence from bottom to top. The evaporation chamber 42 is an intermediate chamber, and the above chambers are separated by tube sheets. The evaporation section 4 also includes evaporation section tube sheets 44 arranged at the upper and lower ends of the evaporation chamber 42, and a plurality of evaporation section heat exchange tubes 45 fixedly arranged between the two evaporation section tube sheets 44, and the inlet of the evaporation section heat exchange tube 45 is connected to the second chamber 43, and the inlet of the evaporation section heat exchange tube 45 is arranged at its upper end. A plurality of evaporation section baffles 46 are arranged on the inner side of the evaporation chamber 42, and the plurality of evaporation section heat exchange tubes 45 all penetrate each evaporation section baffle 46. The evaporation section heat exchange tube 45 is a single straight tube, which is the heat exchange tube of the evaporation section 4.

[0072] The two evaporation section tube sheets 44 seal the upper and lower ends of the evaporation chamber 42, and a lower head is provided at the bottom of the liquid accumulation chamber 41. The drainage chamber 31 is provided above the second chamber 43. In addition, in some other embodiments, the generating section 1, the condensing section 2 and the evaporation section 4 can be replaced by other existing refrigerant generating equipment, condensing equipment and evaporating equipment. In addition, in some other embodiments, a liquid distributor D connected to the upper end of each evaporation section heat exchange tube 45 can also be provided inside the second chamber 43, and the top of the liquid distributor D is provided with a through hole for the low-pressure and low-temperature gaseous refrigerant R5 to flow out upward.

[0073] During the decomposition process of the high-pressure rich liquid L1, the high-pressure rich liquid L1 enters the generating section 1 from the chamber 13, and flows into the generating chamber 12 from the upper end inlet of the generating section heat exchange tube 15, and a heat source H is introduced into the generating chamber 12, and the heat source H flows downward in an S shape along the generating section baffle 16, and the high-pressure rich liquid L1 is decomposed into high-pressure lean liquid L2 and high-pressure gaseous refrigerant R1 after being heated, and the high-pressure lean liquid L2 flows from the lean liquid outlet of the lower head of the generating section 1 to the straight pipe section 72 of the ejector assembly 7, and the high-pressure gaseous refrigerant R1 flows from the upper end of the generating section heat exchange tube 15 to the lower end inlet of the first tube sheet 24 of the condensing section of the condensing section 2.

[0074] When the condensing section 2 cools the high-pressure gaseous refrigerant R1, circulating water W is introduced into the condensing chamber 22, and the circulating water W flows upward in an S shape along the condensing section baffle 28 to cool the high-pressure gaseous refrigerant R1 in the generating section heat exchange tube 15. During the upward flow of the high-pressure gaseous refrigerant R1, it gradually liquefies into a high-pressure liquid refrigerant R2. The high-pressure liquid refrigerant R2 is sprayed into the reflux chamber 23 from the air vent V and flows to the upper end inlet of the condensing section outer tube 27. Then the high-pressure liquid refrigerant R2 flows along the inner wall of the condensing section outer tube 27 to the discharge chamber 21, and flows into the diversion pressure reducing pipeline 5 under the action of the pressure in the condensing section 2, and is divided into low-pressure and low-temperature liquid refrigerant R3 and low-pressure liquid refrigerant R4.

[0075] After the low-pressure liquid refrigerant R4 enters the absorption section 3, the low-pressure and low-temperature liquid refrigerant R3 enters the evaporation section 4 from the chamber 2 43. The refrigerant C is introduced into the evaporation chamber 42 of the evaporation section 4, and the refrigerant C flows downward in an S shape along the evaporation section baffle 46. The low-pressure and low-temperature liquid refrigerant R3 entering the evaporation section 4 is distributed to each evaporation section heat exchange tube 45 through the liquid distributor D, and the refrigerant C is cooled and vaporized into the low-pressure and low-temperature gaseous refrigerant R5. The low-pressure and low-temperature gaseous refrigerant R5 passes through the liquid distributor D upward and enters the absorption section 3.

[0076] like Figure 2-4 As shown, an energy-saving and efficient refrigeration process of the refrigeration unit based on this embodiment is as follows, and its operation process includes the following steps:

[0077] (1) A heat source H is introduced into the generating chamber 12 of the generating section 1. The heat source H flows downward in an S shape along the generating section baffle 16. The high-pressure rich liquid L1 enters the generating section 1 from the chamber 13 and flows into the generating chamber 12 from the upper inlet of the generating section heat exchange tube 15. The heat source H enters the shell side of the chamber 13 to heat the high-pressure rich liquid L1 delivered by the solution pump 6 in the generating section heat exchange tube 15. The high-pressure rich liquid L1 is decomposed into high-pressure lean liquid L2 and high-pressure gaseous refrigerant R1 after being heated. The high-pressure lean liquid L2 flows from the lean liquid outlet of the lower head of the generating section 1 to the straight pipe section 72 of the ejector assembly 7. The high-pressure gaseous refrigerant R1 flows from the upper end of the generating section heat exchange tube 15 to the lower end inlet of the condensing section inner tube 26 at the lower end of the first tube sheet 24 of the condensing section of the condensing section 2, thereby completing the heat exchange of the generating section.

[0078] (2) Circulating water W is introduced into the condensing chamber 22 of the condensing section 2. The circulating water W flows upward in an S shape along the condensing section baffle 28 to cool the high-pressure gaseous refrigerant R1 in the generating section heat exchange tube 15. During the upward flow of the high-pressure gaseous refrigerant R1, it gradually liquefies into high-pressure liquid refrigerant R2. The high-pressure liquid refrigerant R2 is sprayed into the reflux chamber 23 from the vent hole V of the condensing section inner tube 26 and flows to the upper end inlet of the condensing section outer tube 27. Then, the high-pressure liquid refrigerant R2 flows along the inner wall of the condensing section outer tube 27 to the discharge chamber 21, completing the heat exchange of the condensing section.

[0079] (3) The high-pressure liquid refrigerant R2 in the condensing section 2 is decompressed by the diversion pressure reducing pipeline 5 and is divided into two paths. One path passes through the expansion valve A to form the low-pressure and low-temperature liquid refrigerant R3, and the other path passes through the expansion valve B to form the low-pressure and low-temperature liquid refrigerant R4. The low-pressure and low-temperature liquid refrigerant R3 enters the evaporation section 4 from the chamber 2 43. The evaporation chamber 42 of the evaporation section 4 is filled with a refrigerant C. The refrigerant C flows downward in an S shape along the evaporation section baffle 46. After entering the evaporation section 4, the low-pressure and low-temperature liquid refrigerant R3 flows into the evaporation section heat exchange tube 45, forming falling film evaporation, cooling the refrigerant C, and vaporizing it into a low-pressure and low-temperature gaseous refrigerant R5. The low-pressure and low-temperature gaseous refrigerant R5 flows upward into the absorption section 3 to complete the heat exchange in the evaporation section.

[0080] (4) The low-pressure liquid refrigerant R4 in the bypass pressure reducing pipeline 5 enters the absorption section 3 from one side of the absorption chamber 32 and flows upward. The low-pressure liquid refrigerant R4 absorbs heat and pool boils in the absorption chamber 32 to form a low-pressure gaseous refrigerant R7. The low-pressure and low-temperature gaseous refrigerant R5 enters the absorption section 3 from the lower end inlet of the absorption section inner tube 37 and flows upward. The low-pressure and low-temperature gaseous refrigerant R5 absorbs the heat of the liquid in the absorption section outer tube 38 in the absorption section inner tube 37 to form a low-pressure and room-temperature gaseous refrigerant R6 in the gas collecting chamber 34, completing the heat exchange in the absorption section.

[0081] The high-pressure lean liquid L2 at the lean liquid outlet of the generating section 1 flows to the straight pipe section 72 through the pipeline between the ejector assembly 7 and the generating section 1, and enters the nozzle section 74 through the reducing section 73. During the flow of the high-pressure lean liquid L2, a negative pressure is formed in the air inlet chamber 71, and the low-pressure room-temperature gaseous refrigerant R6 and the formed low-pressure gaseous refrigerant R7 are sucked into the nozzle section 74. The high-pressure lean liquid L2 is mixed with the low-pressure room-temperature gaseous refrigerant R6 and the formed low-pressure gaseous refrigerant R7 in the mixing chamber 75, and adiabatic absorption occurs, thereby forming a medium-pressure gas-liquid mixture M. The medium-pressure gas-liquid mixture M passes through the buffer tube 77 and the diffuser tube 78 and enters the liquid collection box 39.

[0082] After the medium-pressure gas-liquid mixture M enters the liquid collecting box 39, it flows downward along the inner wall of the outer tube 38 of the absorption section. During the flow of the medium-pressure gas-liquid mixture M, the low-pressure liquid refrigerant R4 and the low-pressure and low-temperature gaseous refrigerant R5 that have not entered the ejection assembly 7 absorb the heat of the medium-pressure gas-liquid mixture M in the absorption chamber 32, so that the medium-pressure gas-liquid mixture M is quickly converted into a medium-pressure rich liquid L3. The rich liquid outlet of the absorption section 3 is provided on the side wall of the discharge chamber 31. The medium-pressure rich liquid L3 flows out from the outlet at the lower end of the outer tube 38 of the absorption section, and is converted into a high-pressure rich liquid L1 through the solution pump 6, and returns to the generating section 1 to continue the circulation work.

[0083] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An energy-saving and high-efficiency refrigeration unit, comprising a generator, a condenser, an absorber and an evaporator, characterized in that: The liquid refrigerant outlet of the condenser is connected to a split pressure reducing pipeline, and the split pressure reducing pipeline is used to split the liquid refrigerant into two paths, which enter the absorber and the evaporator respectively; Both sides of the shunt pressure reducing pipeline are provided with expansion valves, a solution pump is provided between the rich liquid outlet of the absorber and the rich liquid inlet of the generator, and an ejector is provided on the pipeline between the lean liquid inlet of the absorber and the lean liquid outlet of the generator. The ejector uses high-pressure lean liquid as an ejection source to eject the low-pressure gaseous refrigerant that has absorbed heat and vaporized as a cold source in the absorber and the low-pressure normal-temperature gaseous refrigerant that has recovered cold from the evaporator. The three are partially adiabatically absorbed in the ejector to become a medium-pressure gas-liquid mixture, which enters the absorber to be cooled and cooled, and continues to be absorbed to become a medium-pressure rich liquid, which is sent to the solution pump to continue the cycle.

2. The energy-saving and high-efficiency refrigeration unit according to claim 1, characterized in that: It includes a vertical ejector evaporation absorber and a vertical generator condenser, wherein the vertical generator condenser is used to replace the generator and the condenser, and the vertical ejector evaporation absorber is used to replace the evaporator, the absorber and the ejector; The cylinder of the vertical generator condenser is provided with a generator section and a condensation section in sequence from bottom to top, and the cylinder of the vertical ejector evaporator absorber is provided with an evaporation section and an absorption section in sequence from bottom to top, the liquid refrigerant outlet of the condensation section is connected to the refrigerant inlet of the absorption section and the evaporation section respectively, the rich liquid outlet of the absorption section is connected to the rich liquid inlet of the generator section, and the generator section, condensation section, absorption section and evaporation section are respectively equipped with a plurality of vertical heat exchange tubes; The top end of the heat exchange tube of the generating section is connected with the bottom end of the heat exchange tube of the condensing section through chamber one, the top end of the heat exchange tube of the evaporating section is connected with the bottom end of the heat exchange tube of the absorbing section through chamber two, and an ejector assembly is provided on the lean liquid inlet at the top of the absorbing section, and the ejector assembly is arranged between the lean liquid inlet at the top of the absorbing section and the lean liquid outlet at the bottom of the generating section.

3. The energy-saving and high-efficiency refrigeration unit according to claim 2 is characterized in that: The heat exchange tubes of the generating section and the evaporating section are both single straight tubes, and the heat exchange tubes of the condensing section and the absorbing section are both sleeve tubes, which are composed of an inner tube and an outer tube.

4. The energy-saving and high-efficiency refrigeration unit according to claim 3 is characterized in that: The absorption section includes a drainage chamber, an absorption chamber, a collection chamber and a gas collection chamber which are separated from bottom to top by a plurality of tube sheets, and the collection chamber is provided with a liquid collection box; The upper and lower outlets of the inner tube of the heat exchange tube of the absorption section are respectively connected to the gas collecting chamber and the second chamber, and the upper and lower outlets of the outer tube of the heat exchange tube are respectively connected to the collection chamber and the liquid discharge chamber.

5. The energy-saving and high-efficiency refrigeration unit according to claim 4, characterized in that: The condensation section comprises a discharge chamber, a condensation chamber and a reflux chamber which are arranged in sequence from bottom to top; The upper and lower outlets of the inner tube of the heat exchange tube of the condensing section are respectively connected to the reflux chamber and chamber one, and the upper and lower outlets of the outer tube of the heat exchange tube are respectively connected to the reflux chamber and the discharge chamber, and the upper outlet of the inner tube is higher than the upper inlet of the outer tube; The liquid refrigerant outlet of the discharge chamber of the condensing section is connected to a shunt pressure reducing pipeline, and the two routes of the shunt pressure reducing pipeline are respectively connected to the absorption section and the evaporation section. The solution pump is arranged between the rich liquid outlet of the absorption section and the rich liquid inlet of the generating section.

6. The energy-saving and high-efficiency refrigeration unit according to claim 4, characterized in that: The ejection assembly includes a diffuser tube, a buffer tube, a reducing tube, a mixing chamber, and an air intake chamber which are sequentially connected to the liquid collection box. A nozzle section, a reducing section, and a straight pipe section are arranged in the air intake chamber. The air intake chamber is respectively connected to the absorption chamber and the air collecting chamber.

7. The energy-saving and high-efficiency refrigeration unit according to claim 4, characterized in that: The generating section and the evaporating section both include three chambers separated by two tube sheets. The heat exchange tube is located in the middle chamber, and the heat exchange tube communicates with the upper and lower chambers.

8. An energy-saving and efficient refrigeration process, characterized in that: The process is based on the refrigeration unit according to claim 1, and comprises the following steps: The heat source and high-pressure rich liquid are introduced into the generator, and the high-pressure rich liquid replaces the heat in the heat source and decomposes into high-pressure lean liquid and high-pressure gaseous refrigerant, completing the heat exchange in the generator section; The high-pressure gaseous refrigerant in the generator enters the condenser, and circulating water is introduced into the condenser. The circulating water replaces the heat in the high-pressure gaseous refrigerant to form high-pressure liquid refrigerant, completing the heat exchange in the condensation section. The high-pressure liquid refrigerant in the condenser is decompressed by the shunt pressure reducing pipeline and is divided into two paths, forming a low-pressure and low-temperature liquid refrigerant and a low-pressure liquid refrigerant. The low-pressure and low-temperature liquid refrigerant enters the evaporator, replaces the heat in the refrigerant in the evaporator, forms a low-pressure and low-temperature gaseous refrigerant, and completes the heat exchange in the evaporation section; After the low-pressure and low-temperature gaseous refrigerant in the evaporator and the low-pressure liquid refrigerant in the bypass pressure reducing pipeline enter the absorber, they displace the heat generated in the process of enriching the refrigerant in the absorber, and form low-pressure normal-temperature gaseous refrigerant and low-pressure gaseous refrigerant, completing the heat exchange in the absorption section; The high-pressure lean liquid in the generator enters the ejector, and the ejector extracts low-pressure room-temperature gaseous refrigerant and low-pressure gaseous refrigerant from the absorber. The high-pressure lean liquid is mixed with the low-pressure room-temperature gaseous refrigerant and the low-pressure gaseous refrigerant to form a medium-pressure gas-liquid mixture, and enters the absorber. The medium-pressure gas-liquid mixture forms a medium-pressure rich liquid in the absorber. The solution pump extracts the medium-pressure rich liquid from the absorber to form a high-pressure rich liquid. The high-pressure rich liquid enters the generator under the action of the solution pump.

9. An energy-saving and efficient refrigeration process, characterized in that: The process is based on the refrigeration unit according to any one of claims 2 to 7, and comprises the following steps: The heat source and high-pressure rich liquid are introduced into the generating section. The high-pressure rich liquid replaces the heat in the heat source in the heat exchange tube of the generating section and decomposes into high-pressure lean liquid and high-pressure gaseous refrigerant. The high-pressure gaseous refrigerant in the generating section enters the heat exchange tube in the condensing section. Circulating water is introduced into the condensing section. The circulating water replaces the heat in the high-pressure gaseous refrigerant to form high-pressure liquid refrigerant. The high-pressure liquid refrigerant in the condensing section is decompressed by the shunt pressure reducing pipeline and is divided into two paths, forming a low-pressure low-temperature liquid refrigerant and a low-pressure liquid refrigerant. The low-pressure low-temperature liquid refrigerant enters the heat exchange tube of the evaporating section, displaces the heat of the refrigerant in the evaporating section, and forms a low-pressure low-temperature gaseous refrigerant. After the low-pressure low-temperature gaseous refrigerant in the evaporating section and the low-pressure liquid refrigerant in the shunt pressure reducing pipeline enter the absorption section, they displace the heat generated in the process of enriching the refrigerant in the absorption section, and form a low-pressure normal-temperature gaseous refrigerant and a low-pressure gaseous refrigerant. After the high-pressure lean liquid in the generating section enters the ejector assembly, the ejector assembly extracts low-pressure room-temperature gaseous refrigerant and low-pressure gaseous refrigerant from the absorption section, and the high-pressure lean liquid is mixed with the low-pressure room-temperature gaseous refrigerant and the low-pressure gaseous refrigerant to form a medium-pressure gas-liquid mixture, and enters the absorption section. The medium-pressure gas-liquid mixture forms a medium-pressure rich liquid in the absorption section, and the solution pump extracts the medium-pressure rich liquid from the absorption section to form a high-pressure rich liquid. The high-pressure rich liquid enters the generating section under the action of the solution pump.

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