Absorption and compression combined type heat pump capable of being adjusted in large range and adjusting method

Abstract

The invention provides a large-range adjustable absorption and compression combined type heat pump and an adjusting method. The large-range adjustable absorption and compression combined type heat pump comprises an absorption type heat pump, an expansion valve, a refrigerant pump, an electric stop valve, a low-temperature evaporator, a bypass valve and a compressor. The absorption heat pump comprises a generator, a condenser, an absorber and an evaporative condenser. When the temperature of the low-temperature heat source is low, the compressor operates, the Freon refrigerant flowing out of the low-temperature evaporator enters the compressor, enters the evaporative condenser of the absorption heat pump to be condensed and release heat after being compressed, and then returns to the low-temperature evaporator after being throttled and depressurized through the expansion valve, and circulation is completed. When the temperature of the low-temperature heat source is high, the compressor stops running, the Freon refrigerant flowing out of the low-temperature evaporator enters the evaporative condenser of the absorption heat pump after passing through the bypass valve, and after releasing heat in the evaporative condenser, the Freon refrigerant flows through the electric stop valve and the refrigerant pump and returns to the low-temperature evaporator to complete circulation. The compressor is completely cut out while normal circulation of a Freon refrigerant is guaranteed, so that the absorption and compression combined type heat pump is prevented from being limited by the lowest rotating speed of the compressor, stepless adjustment of the load rate of the combined type heat pump is achieved, the flexibility of the combined type heat pump during large-range variable working condition adjustment is remarkably improved, and the service life of the combined type heat pump is prolonged. The full-working-condition operation efficiency is improved, and the system operation cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of heating, and in particular relates to a wide-range adjustable absorption-compression composite heat pump and an adjusting method. Background Art

[0002] With the development of urban construction, the recycling and utilization of waste heat resources has become an important measure to help build low-carbon green cities. Heat pump technology has been used more and more. In addition to absorption heat pumps and electric compression heat pumps, absorption-compression composite heat pumps have become the development direction in the field of low-temperature waste heat recovery and utilization because they have the advantages of both electric compression cycle and absorption cycle.

[0003] For the absorption-compression compound heat pump with fully coupled compression cycle and absorption cycle, although it can meet the higher output temperature requirements while realizing efficient recovery of low-temperature waste heat resources, its compression cycle and absorption cycle need to be started and stopped at the same time. Since there is a minimum speed requirement during the operation of the compressor, the compound heat pump also has a minimum load rate limit. In many applications, the fluctuation range of user heat load demand is large, and the temperature of the low-temperature heat source also fluctuates greatly. The minimum load rate limit of the compound heat pump leads to a significant reduction in its flexibility when operating under variable conditions in response to external fluctuations, compared with the absorption heat pump that can basically achieve stepless regulation. This significantly restricts the application of compound heat pumps in the field of heating.

[0004] The invention patent with publication number CN1804511A discloses a compression-absorption composite heat pump heating system, which realizes the series connection of the compression heat pump and the absorption heat pump by embedding the condenser of the compression heat pump into the evaporator of the absorption heat pump. The compression heat pump and the absorption heat pump are coupled with each other. When the compressor stops running, the absorption heat pump cannot operate due to the lack of low-temperature heat source. When the temperature of the low-temperature heat source is high, the composite heat pump, which is limited by the minimum speed of the compressor, reduces the heating efficiency due to the power consumption of the compressor.

[0005] It can be seen that it is of great significance to propose a wide-range regulated absorption-compression compound heat pump and its regulation method, which can achieve the coupling of compression cycle and absorption cycle while avoiding the compressor speed limitation and increasing the load regulation range. Summary of the invention

[0006] (I) Purpose of the invention

[0007] The object of the present invention is to provide an absorption-compression compound heat pump with wide range adjustment and its adjustment method, which can realize the cut-out of the compressor when the temperature of the waste heat resource is high while ensuring the normal circulation of the Freon refrigerant by setting a bypass pipeline and a refrigerant pump, thereby eliminating the operating limitation of the minimum speed of the compressor and realizing efficient and flexible adjustment of a wide range of variable operating conditions.

[0008] (II) Technical solution

[0009] In order to solve the above problems, the first aspect of the present invention provides a wide range adjustable absorption compression compound heat pump, comprising:

[0010] Absorption heat pump, expansion valve, refrigerant pump, electric stop valve, low-temperature evaporator, bypass valve, compressor.

[0011] The absorption heat pump consists of an absorber, an evaporative condenser, a generator, and a condenser.

[0012] When the compressor is running, the bypass valve is closed and the electric stop valve is closed. The refrigerant vapor at the outlet of the low-temperature evaporator enters the compressor for compression, and the refrigerant vapor after pressure increase enters the evaporative condenser of the absorption heat pump, where it is condensed. The condensed liquid refrigerant is depressurized by the expansion valve and then enters the low-temperature evaporator for evaporation.

[0013] When the compressor stops running, the bypass valve opens, the electric stop valve opens, the working fluid pump runs, and the expansion valve closes. The refrigerant at the outlet of the low-temperature evaporator flows through the bypass valve and enters the evaporative condenser of the absorption heat pump. After heat exchange in the evaporative condenser, it flows out and returns to the low-temperature evaporator to absorb heat after passing through the electric stop valve and the working fluid pump in sequence.

[0014] The low-temperature heat source enters the low-temperature evaporator, releases heat and cools down before flowing out.

[0015] The driving heat source enters the generator of the absorption heat pump and releases heat before flowing out.

[0016] The return water from the heat user flows through the absorber and condenser of the absorption heat pump in sequence, and after being heated, it flows out as the supply water for the heat user.

[0017] Furthermore, it also includes: a gas-liquid separator. The refrigerant at the outlet of the low-temperature evaporator first enters the gas-liquid separator, and the refrigerant vapor after gas-liquid separation flows through the compressor or the bypass valve and enters the absorption heat pump evaporative condenser for condensation.

[0018] Furthermore, it also includes: a three-way switching valve, the three-way switching valve has an inlet, a first outlet, and a second outlet. The refrigerant at the outlet of the low-temperature evaporator passes through the three-way switching valve. When the compressor is running, the inlet of the three-way switching valve is connected to the second outlet circuit, the inlet of the three-way switching valve is cut off from the first outlet circuit, and the refrigerant flows out through the second outlet of the three-way switching valve and enters the compressor. When the compressor stops running, the inlet of the three-way switching valve is connected to the first outlet circuit, the inlet of the three-way switching valve is cut off from the second outlet circuit, and the refrigerant flows out through the first outlet of the three-way switching valve and enters the absorption heat pump evaporative condenser.

[0019] Furthermore, it also includes: a first one-way valve. When the compressor is running, the refrigerant at the outlet of the expansion valve flows through the first one-way valve and then enters the low-temperature evaporator.

[0020] Furthermore, the invention further comprises: a second one-way valve. When the compressor stops running, the refrigerant at the outlet of the bypass valve flows through the second one-way valve and then enters the evaporative condenser of the absorption heat pump.

[0021] Another aspect of the present invention provides a method for regulating an absorption-compression compound heat pump with a wide range of regulation, which utilizes any one of the absorption-compression compound heat pumps with a wide range of regulation provided by the first aspect of the present invention to achieve efficient operation regulation of the absorption-compression compound heat pump through compressor operation control and valve switching.

[0022] (III) Beneficial effects

[0023] The above technical solution of the present invention has the following beneficial technical effects:

[0024] The present invention utilizes a bypass valve, an electric stop valve, and a working fluid pump. When the absorption-compression compound heat pump is operated under variable operating conditions, the compressor can be completely cut out while ensuring the normal circulation of the Freon refrigerant, thereby avoiding the absorption-compression compound heat pump from being limited by the minimum speed of the compressor, achieving stepless regulation of the load rate of the compound heat pump, significantly improving the flexibility of the compound heat pump in adjusting under a wide range of variable operating conditions, significantly improving the operating efficiency under all operating conditions, and reducing the operating cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the structure of the device of Embodiment 1 of the present invention;

[0026] Figure 2 is a schematic diagram of the device structure of embodiment 2 of the present invention;

[0027] Figure 3 is a schematic diagram of the device structure of embodiment 3 of the present invention;

[0028] Figure 4 is a schematic diagram of the structure of a device according to Embodiment 4 of the present invention;

[0029] Figure 5 is a schematic diagram of the structure of a device according to Embodiment 5 of the present invention;

[0030] Figure Tag:

[0031] 1: Absorption heat pump; A: Absorber; EC: Evaporative condenser; G: Generator; C: Condenser; 2: Expansion valve; 201: Expansion valve inlet; 202: Expansion valve outlet; 3: Refrigerant pump; 301: Refrigerant pump inlet; 302: Refrigerant pump outlet; 4: Electric stop valve; 401: Electric stop valve inlet; 402: Electric stop valve outlet; 5: Low-temperature evaporator; 501: Refrigerant inlet; 502: Refrigerant outlet; 503: Heat source water inlet; 504: Heat source water outlet; 6: Bypass valve; 601: Bypass valve inlet; 602: bypass valve outlet; 7: compressor; 701: compressor inlet; 702: compressor outlet; 8: gas-liquid separator; 801: gas-liquid separator inlet; 802: gas-liquid separator outlet; 9: three-way switching valve; 901: three-way switching valve inlet; 902: three-way switching valve first outlet; 903: three-way switching valve second outlet; 10: first one-way valve; 101: first one-way valve inlet; 102: first one-way valve outlet; 11: second one-way valve; 111: second one-way valve inlet; 112: second one-way valve outlet. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0033] The terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be described in more detail below with reference to the accompanying drawings. In each of the drawings, the same elements are represented by similar figure numerals. For the sake of clarity, the various parts in the drawings are not drawn to scale.

[0036] Specifically, as described in the following specific embodiments:

[0037] Embodiment 1:

[0038] Figure 1 It is a schematic diagram of the device structure of the first embodiment of the present invention.

[0039] like Figure 1 As shown, in the invention, a wide range adjustable absorption compression compound heat pump and its adjustment method include:

[0040] Absorption heat pump 1, expansion valve 2, refrigerant pump 3, electric stop valve 4, low-temperature evaporator 5, bypass valve 6, compressor 7.

[0041] The absorption heat pump 1 includes an absorber A, an evaporative condenser EC, a generator G, and a condenser C.

[0042] The low-temperature evaporator 5 includes a refrigerant inlet 501 , a refrigerant outlet 502 , a heat source water inlet 503 , and a heat source water outlet 504 .

[0043] The refrigerant outlet 502 of the low-temperature evaporator 5 is connected to the compressor inlet 701 of the compressor 7, the compressor outlet 702 of the compressor 7 is connected to the evaporative condenser EC inlet of the absorption heat pump 1, the evaporative condenser EC outlet of the absorption heat pump 1 is connected to the expansion valve inlet 201 of the expansion valve 2, and the expansion valve outlet 202 of the expansion valve 2 is connected to the refrigerant inlet 501 of the low-temperature evaporator 5.

[0044] The refrigerant outlet 502 of the low-temperature evaporator 5 is connected to the bypass valve inlet 601 of the bypass valve 6, the bypass valve outlet 602 of the bypass valve 6 is connected to the evaporative condenser EC inlet of the absorption heat pump 1, the evaporative condenser EC outlet of the absorption heat pump 1 is connected to the electric stop valve inlet 401 of the electric stop valve 4, the electric stop valve outlet 402 of the electric stop valve 4 is connected to the refrigerant pump inlet 301 of the refrigerant pump 3, and the refrigerant pump outlet 302 of the refrigerant pump 3 is connected to the refrigerant inlet 501 of the low-temperature evaporator 5.

[0045] The low-temperature heat source is communicated with the heat source water inlet 503 of the low-temperature evaporator 5 .

[0046] The driving heat source is connected to the generator G of the absorption heat pump 1 .

[0047] The return water of the heat user is connected to the inlet of the absorber A of the absorption heat pump 1, and the supply water of the heat user is connected to the outlet of the condenser C of the absorption heat pump 1.

[0048] In this embodiment, the Freon refrigerant condenses in the heat exchange tubes of the evaporative condenser, and the refrigerant water of the lithium bromide absorption cycle evaporates outside the heat exchange tubes of the evaporative condenser. The Freon compression cycle and the lithium bromide absorption cycle are fully coupled, which improves the utilization efficiency and temperature rise range of the low-temperature heat source. At the same time, the switching of the Freon circuit can be achieved through the opening and closing adjustment of the designed stop valve and bypass valve. When the heat load of the heat users is low, the heat temperature demand is low, and the temperature grade of the low-temperature heat source is high in the early and late cold periods, the compressor can be completely cut out, avoiding the minimum operating frequency limit of the compressor during low-load adjustment, thereby realizing a wide range of operating condition adjustment, improving the operating efficiency of all operating conditions, and reducing the system operating cost.

[0049] The specific operation and adjustment methods of this embodiment are as follows:

[0050] The low-temperature heat source enters the low-temperature evaporator 5 and flows out after being cooled, and the driving heat source enters the generator G of the absorption heat pump 1, and flows out after being cooled in the generator G.

[0051] In the early cold period, the temperature of the low-temperature heat source is relatively high, the heat load of the heat users is relatively low, and the heating temperature demand of the heat users is relatively low. At this time, the electric stop valve 4 is opened, the bypass valve 6 is opened, the expansion valve 2 is closed, the refrigerant pump 3 is turned on, and the compressor 7 stops running. The Freon refrigerant flowing out of the evaporative condenser EC of the absorption heat pump 1 passes through the electric stop valve 4 and the refrigerant pump 3 and enters the low-temperature evaporator 5. In the low-temperature evaporator 5, it exchanges heat with the low-temperature heat source to increase the temperature. The heated Freon refrigerant flows through the bypass valve 6 and returns to the evaporative condenser EC of the absorption heat pump 1, completing the Freon refrigerant cycle. At this time, the Freon refrigerant only serves as a heat exchange medium between the low-temperature heat source and the absorption cycle refrigerant water, and the composite heat pump only uses the absorption cycle to realize external heating.

[0052] From the early cold period to the severe cold period, the temperature of the low-temperature heat source gradually decreases, the heat load of the heat user gradually increases, and the heat temperature demand of the heat user gradually increases. When the heat demand of the heat user cannot be met by the absorption cycle alone, the electric stop valve 4 is closed, the bypass valve 6 is closed, the refrigerant pump 3 is closed, the compressor 7 is turned on, and the expansion valve 2 is turned on. The Freon refrigerant flowing out of the evaporative condenser EC of the absorption heat pump 1 is throttled and depressurized by the expansion valve 2, and then enters the low-temperature evaporator 5, where it absorbs heat and evaporates. The evaporated refrigerant vapor enters the compressor 7, and after being compressed and pressurized by the compressor 7, it returns to the evaporative condenser EC of the absorption heat pump 1 for cooling and condensation. The expansion valve 2 automatically adjusts the opening according to the superheat of the refrigerant vapor, and the compressor 7 runs at the lowest frequency after starting. As the heat load demand of the heat user increases and the temperature of the low-temperature heat source gradually decreases, the frequency of the compressor 7 gradually increases.

[0053] During severe cold periods, the temperature of the low-temperature heat source is the lowest, the heat load of the heat users is the largest, and the heat temperature demand of the heat users is the highest. At this time, the compressor 7 operates at the maximum frequency, and the heating capacity of the compound heat pump is the highest.

[0054] From the severe cold period to the end of the cold period, the temperature of the low-temperature heat source gradually increases, the heat load of the heat users gradually decreases, and the heating temperature demand of the heat users gradually decreases. At this time, the frequency of the compressor 7 is gradually reduced to the minimum operating frequency. When the heat load of the heat users continues to decrease, the bypass valve 6 is opened, the compressor 7 is closed, the refrigerant pump 3 is opened, the electric stop valve 4 is opened, and the expansion valve 2 is closed, and the compressor 7 is cut out of the Freon refrigerant cycle. At this time, the Freon refrigerant flowing out of the evaporative condenser EC of the absorption heat pump 1 passes through the electric stop valve 4 and the refrigerant pump 3 and enters the low-temperature evaporator 5, where it exchanges heat with the low-temperature heat source and heats up. The heated Freon refrigerant flows through the bypass valve 6 and returns to the evaporative condenser EC of the absorption heat pump 1, completing the Freon refrigerant cycle. The operation mode is the same as that in the early cold period. The Freon refrigerant only serves as a heat exchange medium between the low-temperature heat source and the absorption cycle refrigerant water, and the composite heat pump only uses the absorption cycle to realize external heating.

[0055] Embodiment 2:

[0056] Figure 2 It is a schematic diagram of the device structure of the second embodiment of the present invention.

[0057] The difference from the first embodiment is that this embodiment further includes: a gas-liquid separator 8.

[0058] The gas-liquid separator inlet 801 of the gas-liquid separator 8 is connected to the refrigerant outlet 502 of the low-temperature evaporator 5, the gas-liquid separator outlet 802 of the gas-liquid separator 8 is connected to the compressor inlet 701 of the compressor 7, and the gas-liquid separator outlet 802 of the gas-liquid separator 8 is connected to the bypass valve inlet 601 of the bypass valve 6.

[0059] Compared with the first embodiment, in this embodiment, a gas-liquid separator 8 is provided to separate the gas and liquid of the Freon refrigerant flowing out of the low-temperature evaporator 5, thereby preventing the liquid refrigerant from entering the compressor 7 and ensuring the safe operation of the compressor 7.

[0060] Embodiment three:

[0061] Figure 3 It is a schematic diagram of the device structure of embodiment 3 of the present invention.

[0062] The difference from the first embodiment is that this embodiment further includes: a three-way switching valve 9.

[0063] The three-way switching valve 9 has a three-way switching valve inlet 901 , a three-way switching valve first outlet 902 , and a three-way switching valve second outlet 903 .

[0064] The three-way switching valve inlet 901 of the three-way switching valve 9 is connected to the refrigerant outlet 502 of the low-temperature evaporator 5, the three-way switching valve first outlet 902 of the three-way switching valve 9 is connected to the evaporative condenser EC inlet of the absorption heat pump 1, and the three-way switching valve second outlet 903 of the three-way switching valve 9 is connected to the compressor inlet 701 of the compressor 7.

[0065] Compared with the first embodiment, the bypass valve 6 is cancelled in the present embodiment, and a three-way switching valve 9 is added. The three-way switching valve 9 is used to switch the pipeline of the Freon refrigerant, making the system simpler.

[0066] Specifically, in this embodiment, when the compressor 7 is running, the inlet 901 of the three-way switching valve 9 is connected to the second outlet 903 circuit, and the refrigerant flowing out of the low-temperature evaporator 5 enters the compressor 7 after passing through the three-way switching valve 9. When the compressor 7 stops running, the inlet 901 of the three-way switching valve 9 is connected to the first outlet 902 circuit, and the refrigerant flowing out of the low-temperature evaporator 5 enters the evaporative condenser EC of the absorption heat pump 1 after passing through the three-way switching valve 9.

[0067] Embodiment 4:

[0068] Figure 4 It is a schematic diagram of the device structure of embodiment 4 of the present invention.

[0069] The difference from the first embodiment is that this embodiment further includes: a first one-way valve 10 .

[0070] The first one-way valve inlet 101 of the first one-way valve 10 is communicated with the expansion valve outlet 202 of the expansion valve 2 , and the first one-way valve outlet 102 of the first one-way valve 10 is communicated with the refrigerant inlet 501 of the low-temperature evaporator 5 .

[0071] Compared with the first embodiment, the first one-way valve 10 is added in the present embodiment to ensure the one-way flow of the Freon refrigerant from the evaporative condenser EC of the absorption heat pump 1 to the low-temperature evaporator 5, thereby ensuring the stability of the system operation.

[0072] Embodiment five:

[0073] Figure 5 It is a schematic diagram of the device structure of embodiment 5 of the present invention.

[0074] The difference from the fourth embodiment is that this embodiment further includes: a second one-way valve 11.

[0075] The second one-way valve inlet 111 of the second one-way valve 11 is connected to the bypass valve outlet 602 of the bypass valve 6 , and the second one-way valve outlet 112 of the second one-way valve 11 is connected to the evaporative condenser EC inlet of the absorption heat pump 1 .

[0076] Compared with the fourth embodiment, the second one-way valve 11 is added in the present embodiment to ensure the one-way flow of the Freon refrigerant from the low-temperature evaporator 5 to the evaporation condenser EC of the absorption heat pump 1, thereby ensuring the stability of the system operation.

[0077] The present invention has been described above with reference to the embodiments of the present invention. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. Without departing from the scope of the present invention, a person skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A wide range adjustable absorption compression compound heat pump, characterized in that: include: Absorption heat pump (1), expansion valve (2), refrigerant pump (3), electric stop valve (4), low-temperature evaporator (5), bypass valve (6), compressor (7); The absorption heat pump (1) comprises an absorber (A), an evaporative condenser (EC), a generator (G), and a condenser (C); The low-temperature evaporator (5) comprises a refrigerant inlet (501), a refrigerant outlet (502), a heat source water inlet (503), and a heat source water outlet (504); The refrigerant outlet (502) of the low-temperature evaporator (5) is connected to the compressor inlet (701) of the compressor (7), the compressor outlet (702) of the compressor (7) is connected to the inlet of the evaporative condenser (EC) of the absorption heat pump (1), the evaporative condenser (EC) outlet of the absorption heat pump (1) is connected to the expansion valve inlet (201) of the expansion valve (2), and the expansion valve outlet (202) of the expansion valve (2) is connected to the refrigerant inlet (501) of the low-temperature evaporator (5); The refrigerant outlet (502) of the low-temperature evaporator (5) is connected to the bypass valve inlet (601) of the bypass valve (6), the bypass valve outlet (602) of the bypass valve (6) is connected to the inlet of the evaporative condenser (EC) of the absorption heat pump (1), the evaporative condenser (EC) outlet of the absorption heat pump (1) is connected to the electric stop valve inlet (401) of the electric stop valve (4), the electric stop valve outlet (402) of the electric stop valve (4) is connected to the refrigerant pump inlet (301) of the refrigerant pump (3), and the refrigerant pump outlet (302) of the refrigerant pump (3) is connected to the refrigerant inlet (501) of the low-temperature evaporator (5); The low-temperature heat source is connected to the heat source water inlet (503) of the low-temperature evaporator (5); A driving heat source is connected to a generator (G) of the absorption heat pump (1); The heat user return water is connected to the absorber (A) inlet of the absorption heat pump (1), and the heat user supply water is connected to the condenser (C) outlet of the absorption heat pump (1).

2. A wide range adjustable absorption compression compound heat pump as claimed in claim 1, characterized in that: Also includes: Gas-liquid separator (8); The gas-liquid separator inlet (801) of the gas-liquid separator (8) is connected to the refrigerant outlet (502) of the low-temperature evaporator (5), the gas-liquid separator outlet (802) of the gas-liquid separator (8) is connected to the compressor inlet (701) of the compressor (7), and the gas-liquid separator outlet (802) of the gas-liquid separator (8) is connected to the bypass valve inlet (601) of the bypass valve (6).

3. The absorption-compression compound heat pump with wide range regulation according to claim 1, characterized in that: Also includes: Three-way switching valve (9); The three-way switching valve (9) comprises a three-way switching valve inlet (901), a three-way switching valve first outlet (902), and a three-way switching valve second outlet (903); The three-way switching valve inlet (901) of the three-way switching valve (9) is connected to the refrigerant outlet (502) of the low-temperature evaporator (5), the three-way switching valve first outlet (902) of the three-way switching valve (9) is connected to the evaporative condenser (EC) inlet of the absorption heat pump (1), and the three-way switching valve second outlet (903) of the three-way switching valve (9) is connected to the compressor inlet (701) of the compressor (7).

4. A wide range adjustable absorption compression compound heat pump as claimed in claim 1, characterized in that: Also includes: A first one-way valve (10); The first one-way valve inlet (101) of the first one-way valve (10) is connected to the expansion valve outlet (202) of the expansion valve (2), and the first one-way valve outlet (102) of the first one-way valve (10) is connected to the refrigerant inlet (501) of the low-temperature evaporator (5).

5. A wide range adjustable absorption compression compound heat pump as claimed in claim 4, characterized in that: Also includes: A second one-way valve (11); The second one-way valve inlet (111) of the second one-way valve (11) is connected to the bypass valve outlet (602) of the bypass valve (6), and the second one-way valve outlet (112) of the second one-way valve (11) is connected to the inlet of the evaporative condenser (EC) of the absorption heat pump (1).

6. A method for regulating a large-range absorption-compression composite heat pump, characterized in that: By using the absorption-compression compound heat pump with a wide range of adjustment according to any one of claims 1 to 5, efficient operation adjustment of the absorption-compression compound heat pump can be achieved through valve switching.

Images