A heat recovery heat exchanger

Abstract

The present invention relates to a heat recovery heat exchanger, comprising two parallel collecting pipes, a plurality of parallel flat tubes are vertically connected between the two collecting pipes, a liquid inlet pipe and a liquid outlet pipe are connected to the two collecting pipes, so that a refrigerant flow channel is formed in the two collecting pipes and the flat tubes, and the characteristics are: an aluminum plate is welded on both sides of the flat tubes, and a plurality of outer arches are arranged on the inner side of at least one side of the aluminum plate in contact with the flat tube, and the plurality of outer arches are arranged along the tube length direction of the collecting pipes, and the plurality of outer arches are aligned with the gap positions between adjacent flat tubes, so that a drainage groove is formed on the inner side of the outer arches for the residual hot water to pass through. The heat recovery heat exchanger can introduce waste water containing residual heat after bathing by arranging drainage grooves on the sides of the flat tubes, and the residual heat can be recovered by circulating the refrigerant medium in the heat exchanger, so that the energy efficiency of the heat pump water heater can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of heat pump water heaters, and in particular relates to a heat recovery heat exchanger used in a heat pump water heater and capable of realizing waste heat recovery and utilization. Background Art

[0002] When a heat pump water heater is used in a shower room, the bath water is directly discharged. However, the temperature of the waste water after bathing is generally around 35°, which contains a large amount of residual heat and causes waste of residual heat. In order to avoid the waste of heat energy and realize the recycling of residual heat, the heat pump water heater can be improved and designed to realize the recycling of residual heat. Summary of the invention

[0003] The present invention provides a heat recovery heat exchanger which can realize waste heat recovery and improve energy efficiency in order to solve the technical problems existing in the known technology.

[0004] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is:

[0005] A heat recovery heat exchanger comprises two parallel collecting pipes, a plurality of parallel flat tubes are vertically connected between the two collecting pipes, a liquid inlet pipe and a liquid outlet pipe are connected to the two collecting pipes, so that a refrigerant flow channel is formed in the two collecting pipes and the flat tubes, and the heat exchanger is characterized in that: an aluminum plate is welded on both sides of the flat tubes, and a plurality of outer arches are arranged on the inner side of at least one side of the aluminum plate in contact with the flat tube, and the plurality of outer arches are arranged along the tube length direction of the collecting pipes, and the plurality of outer arches are aligned with the gap positions between adjacent flat tubes, so that a drainage groove for the residual hot water to pass through is formed on the inner side of the outer arch.

[0006] Furthermore: the thickness of the aluminum plates on both sides is 1.0 to 3.5 mm.

[0007] Furthermore: in the width direction, both ends of the aluminum plates on both sides extend to the liquid collecting pipes at both ends; in the length direction, both sides of the aluminum plates on both sides extend to the outside of the two outermost rows of flat tubes.

[0008] The advantages and positive effects of the present invention are:

[0009] This heat recovery heat exchanger is an improved design based on the existing microchannel flat tube heat exchanger. Two aluminum plates are welded on both sides of the flat tube, and several drainage grooves are formed on the inner side of the aluminum plate for the waste hot water to pass through. In this way, the waste water containing waste heat after bathing in the shower room can exchange heat with the refrigerant medium in the heat recovery heat exchanger through the drainage groove, and then the waste heat is transferred to the terminal device such as the water heater through the heat pump circulation system for heat recycling. This heat recovery heat exchanger realizes the recycling of waste heat of bathing waste water and improves the energy efficiency of the heat pump water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the present invention;

[0011] Figure 2 yes Figure 1 An enlarged schematic diagram of the first structure in AA section view;

[0012] Figure 3 yes Figure 1 An enlarged schematic diagram of the second structure in AA section view;

[0013] Figure 4 It is a schematic plan view of an aluminum plate provided with an outer arch portion according to the present invention;

[0014] Figure 5 yes Figure 4 A magnified left view of the part.

[0015] In the figure: 1. first collecting pipe; 2. second collecting pipe; 3. flat pipe; 4. liquid inlet pipe; 5. liquid outlet pipe; 6. aluminum plate; 6-1. outer arch; 7. drainage groove. DETAILED DESCRIPTION

[0016] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0017] See also Figure 1-5 A heat recovery heat exchanger includes two parallel collecting pipes, namely a first collecting pipe 1 and a second collecting pipe 2. A number of parallel flat tubes 3 are vertically connected between the two collecting pipes. The flat tubes are microchannel flat tubes. The two collecting pipes are connected with a liquid inlet pipe 4 and a liquid outlet pipe 5, so that a refrigerant flow channel is formed in the two collecting pipes and the flat tubes. The liquid inlet pipe and the liquid outlet pipe can be connected to the same collecting pipe, or respectively to two collecting pipes. The connection method of the liquid inlet pipe, the liquid outlet pipe and the collecting pipe can refer to the connection method of the liquid inlet and outlet pipes and the collecting pipe on the microchannel heat exchanger in the existing automobile air-conditioning system. The flow of the refrigerant in the flat tube can adopt a single process or a multi-process. In addition to the above-mentioned technical features, the innovation of this technical solution lies in:

[0018] An aluminum plate 6 is welded on each side of the flat tube, and multiple outer arches 6-1 are arranged on the inner side of at least one side of the aluminum plate in contact with the flat tube, and the outer arches adopt a semicircular outer arch structure. Specifically, there are two schemes: one is that multiple outer arches are arranged on the inner side of one side of the aluminum plate in contact with the flat tube, and the other side of the aluminum plate is a flat aluminum plate. See attached Figure 2 . 2. There are multiple outer arches on the inner side of the aluminum plates on both sides where they contact the flat tubes. Figure 3. Multiple outer arches are evenly distributed along the length of the liquid collecting pipe, and the gaps between the multiple outer arches and the adjacent flat tubes are aligned one by one, so that the inner side of the outer arch forms a drainage groove 7 for the residual hot water to pass through. When the first solution is adopted, a drainage groove is provided on one side of the flat tube; when the second solution is adopted, drainage grooves are provided on both sides of the flat tube. The aluminum plate provided with the outer arches is preferably a stamped aluminum plate structure, and the multiple drainage grooves on the aluminum plate are formed by one-time stamping.

[0019] The heat recovery heat exchanger mentioned above: the thickness of the aluminum plates on both sides is further preferably 1.0 to 3.5 mm.

[0020] The length and width of the aluminum plate of the heat recovery heat exchanger are further preferably: in the width direction, both ends of the aluminum plates on both sides extend to the liquid collecting pipes at both ends; in the length direction, both sides of the aluminum plates on both sides extend to the outside of the two outermost rows of flat tubes. In this way, the aluminum plate covers the outside of the entire refrigerant flow channel, which guarantees the heat exchange area between the waste hot water and the refrigerant to the greatest extent, so that the heat recovery heat exchanger achieves a better heat exchange efficiency.

[0021] This heat recovery heat exchanger is brazed in a brazing furnace. Specifically: After the two collecting tubes and the multiple rows of flat tubes are spliced ​​in place, two aluminum plates are covered on both sides of the flat tubes. The two aluminum plates are composite aluminum plates with a brazing material layer attached to the inner side. Then, the assembly structure of the collecting tube, flat tube and aluminum plate is fixed by a clamping tool, and finally sent to the brazing furnace for welding.

[0022] This heat recovery heat exchanger is arranged outside the heat pump water heater in the shower room, connected in series in the heat pump system, and used as an evaporator. Its working principle is as follows: after bathing, the waste water with residual heat passes through the drainage groove on the inner side of the aluminum plate, and the aluminum plate conducts the residual heat of the waste water in contact with it to the core assembly. The core assembly refers to the assembly welding structure of two collecting pipes (including the plugging cover at the end and the partition plate set inside), flat pipe, liquid inlet pipe, and liquid outlet pipe. The core assembly conducts the residual heat to the terminal device such as the water heater through the cold medium for heat recycling. The water temperature after bathing is about 35℃ (that is, the contact temperature of the heat recovery heat exchanger), the water temperature that needs to be heated is 15℃, and the water temperature after the water heater is heated is 50℃. Using this heat recovery heat exchanger, the water temperature can be heated to 30℃, which improves the energy efficiency by 30%. The energy efficiency calculation formula is (30℃-15℃) / 50℃=30%.

Claims

1. A heat recovery heat exchanger, comprising two parallel-arranged liquid collecting pipes, a plurality of parallel-arranged flat tubes are vertically connected between the two liquid collecting pipes, a liquid inlet pipe and a liquid outlet pipe are connected to the two liquid collecting pipes, so that a refrigerant flow channel is formed in the two liquid collecting pipes and the flat tubes, characterized in that: An aluminum plate is welded on both sides of the flat tube, and multiple outer arches are arranged on the inner side of at least one side of the aluminum plate in contact with the flat tube. The multiple outer arches are arranged along the tube length direction of the collecting tube, and the multiple outer arches are aligned with the gap positions between adjacent flat tubes, so that a drainage groove is formed on the inner side of the outer arch for the residual hot water to pass through, and the drainage direction of the drainage groove is parallel to the flow direction of the refrigerant in the flat tube hole; This heat recovery heat exchanger is arranged outside the heat pump water heater in the shower room, connected in series in the heat pump system, and used as an evaporator. Its working principle is: the waste water with residual heat after bathing passes through the drainage groove inside the aluminum plate, and the aluminum plate conducts the residual heat of the waste water in contact with it to the core assembly. The core assembly refers to the welded structure of two liquid collecting pipes, flat pipes, liquid inlet pipes, and liquid outlet pipes. The core assembly conducts the residual heat to the water heater terminal device through the refrigerant medium for heat recycling.

2. The heat recovery heat exchanger according to claim 1, characterized in that: The thickness of the aluminum plates on both sides is 1.0 to 3.5 mm.

3. The heat recovery heat exchanger according to claim 1, characterized in that: In the width direction, both ends of the aluminum plates on both sides extend to the liquid collecting pipes at both ends; in the length direction, both sides of the aluminum plates on both sides extend to the outside of the two outermost rows of flat tubes.

Images