An uninterrupted heating and defrosting split air source heat pump unit

Abstract

The present invention relates to a split air source heat pump unit with uninterrupted heating and defrosting, which includes a heating heat pump cycle, and also includes a plurality of air-cooled modules and a defrosting heat pump cycle. The unit is divided into an indoor unit and an outdoor unit. The heating heat pump cycle and related pipelines serve as the indoor unit; the plurality of air-cooled modules and the defrosting heat pump cycle serve as the outdoor unit. The indoor unit reserves the inlets and outlets of the hot water main pipe and the heat-taking coolant main pipe; the outdoor unit reserves the inlets and outlets of the heat-taking coolant main pipe. In the present invention, the equipment included in the unit is respectively arranged in an indoor unit and an outdoor unit, which is convenient for the processing and on-site installation of the whole unit: during on-site installation, an indoor unit and an outdoor unit are directly connected through a coolant pipeline, quickly and conveniently forming a heat pump water heater unit that can ensure very little attenuation of the heating capacity during defrosting.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a split air source heat pump unit with uninterrupted heating and defrosting. Background Art

[0002] An air source heat pump unit is an efficient refrigeration and heating device, but there is a problem of frosting during winter operation. At present, the most widely used defrosting method for air source heat pumps is the reverse defrosting method, but it has the following problems: when defrosting, heat needs to be taken from the indoor or hot water pipe, resulting in poor indoor comfort, low compressor operating energy efficiency, and reduced service life.

[0003] To solve the above defrosting problem, the Chinese patent "An air source flexible cold and hot water unit and its operation method (application number 201510779843.0)" proposes an efficient defrosting air source heat pump system with stable heating capacity output during defrosting. Multiple air-cooled modules are connected to the evaporator through a coolant pipeline. Only one air-cooled module defrosts each time, and other air-cooled modules maintain the state of taking heat from the outside. The air-cooled modules defrost alternately, ensuring continuous and efficient heating of the unit. However, this system uses a plate heat exchanger to defrost by transferring the heat generated by the condenser to produce hot water to the coolant side. For a dispersed heat pump system, the cold and heat transmission distance of this method is too large, resulting in high distribution energy consumption and large heat loss along the way, and the defrosting cannot be carried out in time; moreover, there is a risk of freezing on the hot water side of the plate heat exchanger.

[0004] Therefore, the Chinese patent "A self-defrosting low-temperature air source heat collection device and its operation method (application number 201710044743.2)" proposes a heat pump system that can defrost locally. A small water source heat pump is set on the coolant side. When defrosting is required, the heat pump is turned on to produce a higher temperature coolant for the air-cooled heat pump that needs to be defrosted, and effectively solves the problem of anti-freezing on the hot water side, with high reliability.

[0005] However, although this invention proposes the system form and operation principle, it does not give the product application method for actual engineering. Summary of the Invention

[0006] The object of the present invention is to provide a split air source heat pump unit with uninterrupted heating and defrosting according to the principle of a heat pump system that can defrost locally. The equipment included in the unit is respectively arranged in an indoor unit and an outdoor unit, which is convenient for the processing and on-site installation of the whole unit: during on-site installation, an indoor unit and an outdoor unit are directly connected through a coolant pipeline, quickly and conveniently forming a heat pump hot water unit that can ensure very little attenuation of the heating capacity during defrosting.

[0007] To achieve the above object, the present invention provides a split air source heat pump unit with uninterrupted heating and defrosting, including a heating heat pump cycle, which is composed of a first compressor, a first condenser, a first throttling device, and a first evaporator connected in sequence through a refrigerant pipeline. The first condenser is connected to the user side through a hot water main pipe; it also includes a plurality of air-cooled modules and a defrosting heat pump cycle, which is composed of a second compressor, a second condenser, a second throttling device, and a second evaporator connected in sequence through a refrigerant pipeline; the air-cooled modules are connected in parallel to the heat extraction coolant main pipe through a coolant pipeline, and the heat extraction coolant main pipe is connected to the inlet and outlet of the coolant pipeline of the first evaporator; the second evaporator is connected in parallel to the heat extraction coolant main pipe through a coolant pipeline and is located between the first evaporator and the air-cooled module closest to the first evaporator; the air-cooled modules are also connected in parallel to the defrosting coolant main pipe through a coolant pipeline, and the defrosting coolant main pipe is connected to the inlet and outlet of the coolant pipeline of the second condenser; the split air source heat pump unit with uninterrupted heating and defrosting is divided into an indoor unit and an outdoor unit. The indoor unit includes the heating heat pump cycle and pipelines; the outdoor unit includes a plurality of the air-cooled modules, the defrosting heat pump cycle, and the defrosting coolant main pipe; the indoor unit reserves the inlets and outlets of the hot water main pipe and the heat extraction coolant main pipe; the outdoor unit reserves the inlets and outlets of the heat extraction coolant main pipe.

[0008] Preferably, a heat extraction side coolant pump is provided on the heat extraction coolant main pipe between the second evaporator of the outdoor unit and the air-cooled module closest to the second evaporator.

[0009] Preferably, a defrosting side coolant pump is provided on the defrosting coolant main pipe between the second condenser of the outdoor unit and the air-cooled module closest to the second condenser.

[0010] Preferably, a heat extraction two-way valve is further provided on the inlet and / or outlet coolant pipeline connecting each air-cooled module of the outdoor unit to the heat extraction coolant main pipe.

[0011] Preferably, a defrosting two-way valve is further provided on the inlet and / or outlet coolant pipeline connecting each air-cooled module of the outdoor unit to the defrosting coolant main pipe.

[0012] Preferably, a defrosting two-way valve is further provided on the inlet and / or outlet coolant pipeline connecting the second evaporator of the outdoor unit to the heat extraction coolant main pipe.

[0013] Based on the above technical solutions, the advantages of the present invention are:

[0014] An uninterrupted heating and defrosting split air source heat pump unit provided by the present invention arranges the equipment involved in the heat pump cycle for heating in an indoor unit, and arranges each air-cooled module for heat extraction and the equipment involved in the heat pump cycle for defrosting in an outdoor unit, which is convenient for the processing and on-site installation of the whole unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0016] Figure 1 is a schematic structural principle diagram of the uninterrupted heating and defrosting split air source heat pump unit provided by the present invention;

[0017] Figure 2 is a schematic diagram of an operation mode of the uninterrupted heating and defrosting split air source heat pump unit provided by the present invention;

[0018] Figure 3 is a schematic diagram of another operation mode of the uninterrupted heating and defrosting split air source heat pump unit provided by the present invention.

[0019] Reference numerals:

[0020] A. Indoor unit; B. Outdoor unit; 1.1. First compressor; 1.2. Second compressor; 2.1. First condenser; 2.2. Second condenser; 3.1. First throttling device; 3.2. Second throttling device; 4.1. First evaporator; 4.2. Second evaporator; 5. Air-cooled module; 6. Heat extraction side coolant pump; 7. Defrosting side coolant pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solutions of the present invention will be further described in detail below with reference to the drawings and embodiments.

[0022] The present invention provides an uninterrupted heating and defrosting split air source heat pump unit, as Figure 1As shown in the figure, it includes a heating heat pump cycle, which is composed of a first compressor 1.1, a first condenser 2.1, a first throttling device 3.1, and a first evaporator 4.1 connected in sequence through a refrigerant pipeline. The first condenser 2.1 is connected to the user side through a hot water main pipe; it also includes a plurality of air-cooled modules 5 and a defrosting heat pump cycle, which is composed of a second compressor 1.2, a second condenser 2.2, a second throttling device 3.2, and a second evaporator 4.2 connected in sequence through a refrigerant pipeline; the air-cooled modules 5 are connected in parallel to the heat extraction coolant main pipe through a coolant pipeline, and the heat extraction coolant main pipe is connected to the inlet and outlet of the coolant pipeline of the first evaporator 4.1; the second evaporator 4.2 is connected in parallel to the heat extraction coolant main pipe through a coolant pipeline and is located between the first evaporator 4.1 and the air-cooled module 5 closest to the first evaporator 4.1; the air-cooled modules 5 are also connected in parallel to the defrosting coolant main pipe through a coolant pipeline, and the defrosting coolant main pipe is connected to the inlet and outlet of the coolant pipeline of the second condenser 2.2.

[0023] The uninterrupted heating and defrosting split air source heat pump unit is divided into an indoor unit A and an outdoor unit B. The indoor unit A includes the heating heat pump cycle and pipelines; the outdoor unit B includes a plurality of the air-cooled modules 5, the defrosting heat pump cycle, and the defrosting coolant main pipe; the indoor unit A reserves the inlets and outlets of the hot water main pipe and the heat extraction coolant main pipe; the outdoor unit B reserves the inlets and outlets of the heat extraction coolant main pipe.

[0024] Preferably, a heat extraction side coolant pump 6 is provided on the heat extraction coolant main pipe between the second evaporator 4.2 of the outdoor unit B and the air-cooled module 5 closest to the second evaporator 4.2. A defrosting side coolant pump 7 is provided on the defrosting coolant main pipe between the second condenser 2.2 of the outdoor unit B and the air-cooled module 5 closest to the second condenser 2.2. A heat extraction two-way valve is also provided on the inlet and / or outlet coolant pipeline connecting each air-cooled module 5 of the outdoor unit B to the heat extraction coolant main pipe.

[0025] Furthermore, a defrosting two-way valve is also provided on the inlet and / or outlet coolant pipeline connecting each air-cooled module 5 of the outdoor unit B to the defrosting coolant main pipe. A defrosting two-way valve is also provided on the inlet and / or outlet coolant pipeline connecting the second evaporator 4.2 of the outdoor unit B to the heat extraction coolant main pipe.

[0026] Figure 2Schematic diagram of the normal heating mode of the present invention. In this mode, the heating heat pump cycle is turned on, and the defrosting heat pump cycle is turned off; the fans of all the air-cooled modules 5 are turned on, all the defrosting two-way valves are shut off, and all the heat extraction two-way valves are turned on; the heat extraction side coolant pump 6 is turned on, and the defrosting side coolant pump 7 is turned off. At this time, the heat in the air is transferred to the coolant circulating in the heat extraction coolant main pipe at each of the air-cooled modules 5, and the heat is transported to the first evaporator 4.1 of the indoor unit A, transferred to the refrigerant, and after the temperature grade is raised through the heat extraction heat pump cycle, high-temperature hot water is produced by the first condenser 2.1 and supplied to the user side through the hot water main pipe.

[0027] Figure 3 Schematic diagram of the defrosting heating mode of the present invention. In this mode, the heating heat pump cycle is turned on, the defrosting heat pump cycle is turned on, and the corresponding defrosting two-way valves are turned on; the fans of the normally operating air-cooled modules 5 are turned on, the corresponding defrosting two-way valves are shut off, and the corresponding heat extraction two-way valves are turned on; the fans of the air-cooled modules 5 that need defrosting are turned off, the corresponding defrosting two-way valves are turned on, and the corresponding heat extraction two-way valves are shut off; the heat extraction side coolant pump 6 is turned on, and the defrosting side coolant pump 7 is turned on.

[0028] At this time, the heat in the air is transferred to the coolant circulating in the heat extraction coolant main pipe at the normally operating air-cooled modules. A part of the heat is transported to the first evaporator 2.1 of the indoor unit A, transferred to the refrigerant, and after the temperature grade is raised through the heat extraction heat pump cycle, high-temperature hot water is produced by the first condenser 2.1 and supplied to the user side; another part of the heat is transported to the second evaporator 4.2, transferred to the refrigerant, and after the temperature grade is raised through the defrosting heat pump cycle, high-temperature coolant is produced by the second condenser 2.2 and supplied to the air-cooled modules 5 that need defrosting through the defrosting coolant main pipe for defrosting.

[0029] A kind of uninterrupted heating and defrosting split air source heat pump unit provided by the present invention arranges the equipment involved in the heat pump cycle for heating in one indoor unit, and arranges the equipment involved in each air-cooled module for heat extraction and the heat pump cycle for defrosting in one outdoor unit, which is convenient for the processing and on-site installation of the whole unit.

[0030] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: still can modify the specific implementation manners of the present invention or perform equivalent replacements on some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A split air source heat pump unit with uninterrupted heating and defrosting, characterized in that: It includes a heating heat pump cycle, which is composed of a first compressor (1.1), a first condenser (2.1), a first throttling device (3.1), and a first evaporator (4.1) connected in sequence through refrigerant pipelines. The first condenser (2.1) is connected to the user side through a hot water main pipe; It further includes a plurality of air-cooled modules (5) and a defrosting heat pump cycle, which is composed of a second compressor (1.2), a second condenser (2.2), a second throttling device (3.2), and a second evaporator (4.2) connected in sequence through refrigerant pipelines. The air-cooled modules (5) are connected in parallel to the heat extraction coolant main pipe through coolant pipelines. The heat extraction coolant main pipe is connected to the inlet and outlet of the coolant pipeline of the first evaporator (4.1). The second evaporator (4.2) is connected in parallel to the heat extraction coolant main pipe through a coolant pipeline and is located between the first evaporator (4.1) and the air-cooled module (5) closest to the first evaporator (4.1). The air-cooled modules (5) are also connected in parallel to the defrosting coolant main pipe through coolant pipelines. The defrosting coolant main pipe is connected to the inlet and outlet of the coolant pipeline of the second condenser (2.2); The uninterrupted heating and defrosting split air source heat pump unit is divided into an indoor unit (A) and an outdoor unit (B). The indoor unit (A) includes the heating heat pump cycle and pipelines. The outdoor unit (B) includes a plurality of the air-cooled modules (5), the defrosting heat pump cycle, and the defrosting coolant main pipe. On the inlet and / or outlet coolant pipelines connecting each of the air-cooled modules (5) in the outdoor unit (B) to the defrosting coolant main pipe, defrosting two-way valves are also provided. On the inlet and / or outlet coolant pipelines connecting the second evaporator (4.2) in the outdoor unit (B) to the heat extraction coolant main pipe, defrosting two-way valves are also provided; The indoor unit (A) reserves the inlets and outlets of the hot water main pipe and the heat extraction coolant main pipe. The outdoor unit (B) reserves the inlets and outlets of the heat extraction coolant main pipe.

2. The air source heat pump unit according to claim 1, characterized in that: On the heat extraction coolant main pipe between the second evaporator (4.2) in the outdoor unit (B) and the air-cooled module (5) closest to the second evaporator (4.2), a heat extraction side coolant pump (6) is provided.

3. The air source heat pump unit according to claim 1, wherein: On the defrosting coolant main pipe between the second condenser (2.2) in the outdoor unit (B) and the air-cooled module (5) closest to the second condenser (2.2), a defrosting side coolant pump (7) is provided.

4. The air source heat pump unit according to claim 1, wherein: On the inlet and / or outlet coolant pipelines connecting each of the air-cooled modules (5) in the outdoor unit (B) to the heat extraction coolant main pipe, heat extraction two-way valves are also provided.

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