CN202254521U - A Microchannel Condenser for Heat Pump Water Heater - Google Patents

Abstract

The utility model discloses a microchannel condenser for heat pump water heater contains refrigerant import collector tube bank, refrigerant export collector tube bank, cold water import copper pipe, hot water export copper pipe, rivers flow channel, the flat pipe of microchannel heat transfer. The contact of the porous micro-channel heat exchange flat tube and the side surface of the water flow channel is the contact between planes, the heat conduction contact area is increased, the hot water heating time is shortened, the whole heat exchange tube can be filled with a refrigerating medium in the porous micro-channel heat exchange flat tube, and meanwhile, the flow direction of water and the flow direction of the refrigerating medium are perpendicular to form cross flow to enhance the energy exchange between the porous micro-channel heat exchange flat tube and the water flow channel. The utility model discloses processing technology is simple, has reduced traditional condenser heat exchange tube length, has reduced the inboard flow resistance of refrigerant charge volume and pipeline, has increased the velocity of flow of refrigerant in the condenser pipe, has strengthened the heat transfer effect.

Description

A Microchannel Condenser for Heat Pump Water Heater

technical field

The utility model relates to the technical field of refrigeration equipment, in particular to a microchannel condenser used for a heat pump water heater.

Background technique

The heat pump hot water system is considered to be one of the best equipments to develop and utilize energy. It is a new generation of hot water production devices and equipment after boilers, gas water heaters, electric water heaters and solar water heaters. The heat pump water heater includes a water tank of the water heater, a compressor condenser, an evaporator, a throttling device, and a circuit control system. The water tank of the water heater is composed of an inner tank, an insulation layer and a heating pipe (that is, a condenser). The heating pipe is usually wrapped between the outer side of the inner tank and the insulation layer or installed in the inner tank. The common heating tubes are mostly thin Most of the thin-walled copper tubes and thin-walled copper tubes are spirally wound on the outer surface of the inner tank water tank or installed in the inner tank tank after being spirally wound. The refrigerant flows through the heating tube to condense and release heat, and the water in the water tank absorbs the condensation heat, and the temperature rises.

However, for the condenser of the heat pump water heater with this structure, two common methods are as follows: one is that the heating tube is set as a round thin-walled copper tube in the form of a single tube, and the contact between the thin-walled copper tube and the side of the inner tank is an arc The contact area between the surface and the plane is small. The cooling medium conducts heat conduction through the thin-walled copper tube and the inner tank and heats the water in the inner tank. The water in the inner tank can only be heated by the thin-walled round copper tube and the inner tank. The line contact of the water tank plane conducts heat. After long-term operation, thermal resistance occurs between the thin-walled round copper tube and the inner tank water tank plane, which greatly affects the heat transfer between the thin-walled round copper tube and the inner tank water tank plane, reducing the heat transfer efficiency. Increase the load power of the compressor. In addition, a single thin-walled round copper tube is coiled on the side of the inner tank. In order to enhance the heat exchange between the thin-walled copper tube and the inner tank, the coiling density of the single tube is high, the condenser system is long, and the internal flow resistance is relatively large. The flow velocity in the wall copper tube is lower and the heat transfer effect is reduced.

The second is that the inner tank is equipped with a condenser composed of thin-walled copper tubes. The thin-walled copper tubes are spirally coiled according to the requirements to form a certain shape. The water in the inner tank tank is strengthened by forced convection. For energy exchange, the water quality used in different places is different, which is likely to cause problems such as scaling, corrosion, and biological slime due to the continuous reproduction of microorganisms on the surface of thin-walled copper pipes, which in turn affects the water quality of water heaters. At this stage Countries such as Europe have not allowed heat pump water heaters to adopt the inner plate structure design.

Contents of the invention

The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art, provide a micro-channel condenser for heat pump water heaters, and solve the problem of the small contact area between the thin-walled tube of the condenser and the inner tank of the existing heat pump water heater. Low heat exchange efficiency, short service life of equipment, high energy consumption and other issues.

The utility model is realized through the following technical solutions:

A microchannel condenser for a heat pump water heater, comprising a refrigerant inlet header and a refrigerant outlet header, and a plurality of microchannels are arranged side by side between the refrigerant inlet header and the refrigerant outlet header The heat exchange tube, the microchannel heat exchange tube has at least three layers, each layer is provided with a water flow channel, the microchannel heat exchange tube is attached to the surface of the water flow channel, and the water flow channel is a reciprocating circuitous structure , the water flow direction in the water flow channel and the flow direction of the refrigerant in the microchannel heat exchange tube are perpendicular to each other, the upper end of the water flow channel is provided with a cold water inlet, and the lower end of the water flow channel is provided with a hot water outlet.

One of the structures may be: the microchannel heat exchange tubes are divided into at least three layers of independent structures, that is, the two ends of each layer of microchannel heat exchange tubes are connected to a refrigerant inlet header and a refrigerant inlet header respectively. Outlet header; the two ends of the refrigerant inlet header in these three layers are uniformly communicated and then communicated with the refrigerant circulation system through a tee pipe; the two ends of the refrigerant outlet header in these three layers are also uniformly interconnected Afterwards, it communicates with the refrigerant circulation system through another three-way pipe; the refrigerant inlet header and the refrigerant outlet header are arranged at the same end of the microchannel heat exchange tube or are respectively arranged at two ends of the microchannel heat exchange tube. end.

Another structure may be: the microchannel heat exchange tube has at least three layers, that is, the three layers of microchannel heat exchange tubes are all connected to each other, and the cross-sectional structure of the overall shape after the connection is serpentine or S-shaped microchannel heat exchange tube , and connected to form an end and a tail, the end is connected to a refrigerant inlet header, and the tail is connected to a refrigerant outlet header.

The microchannel heat exchange tube is a microchannel heat exchange flat tube, that is, its cross-sectional shape is a rectangular structure. The flat tube is an aluminum alloy flat tube with a thickness of 1.3 mm to 3.3 mm and a width of 12 mm to 36 mm, which greatly increases the heat conduction contact surface between the microchannel heat exchange tube and the water flow channel.

The beneficial effects of the utility model are: the microchannel heat exchange tube is bonded to the surface of the water flow channel, the heat conduction contact area is enlarged, and the heating time with water is shortened; the cooling medium in the microchannel heat exchange tube can fill the entire heat exchange tube. The water flow direction in the water flow channel and the flow direction of the refrigerant in the microchannel heat exchange tube are perpendicular to each other, which is beneficial to strengthening convective heat transfer, thereby enhancing the energy between the porous microchannel heat exchange flat tube and the water flow channel exchange. The use of serpentine or S-shaped micro-channel heat exchange tubes and the reciprocating circuitous water flow channel reduce the length of traditional condenser heat exchange tubes, reduce the amount of refrigerant charge and flow resistance inside the tube, and increase the flow of refrigerant in the condenser. The flow velocity in the tube enhances the heat transfer effect. The technical means of the patent is simple and easy to implement, safe and reliable, energy-saving and environment-friendly, and has positive effects such as long service life.

Description of drawings

Fig. 1 is a schematic diagram of the first structure of the utility model.

Fig. 2 is the second structure diagram of the utility model.

Fig. 3, wherein: (A) is a schematic diagram of the working principle of the microchannel heat exchange tube and the water flow channel shown in Fig. 2; (B) is a schematic diagram of the working principle of the microchannel heat exchange tube and the water flow channel shown in Fig. 1 .

Fig. 4 is a schematic top view of Fig. 1 of the present utility model.

Fig. 5 is a schematic front view of Fig. 1 of the present utility model.

(A) and (B) in FIG. 6 are left and right schematic diagrams of FIG. 1, respectively.

Fig. 7 is a schematic diagram of a water flow channel with the same structure as Fig. 1 and Fig. 2 .

Detailed ways

The utility model will be further described in detail below in conjunction with specific examples, but the implementation of the utility model is not limited thereto, and for the process parameters not specified in particular, it can be carried out with reference to conventional techniques.

Example

As shown in Figure 1 and Figure 2, the utility model is used for the microchannel condenser of the heat pump water heater, including the refrigerant inlet header 1, 1-1 refrigerant outlet header 2, 2-1, at the refrigerant inlet A plurality of microchannel heat exchange tubes 6, 6-1 are arranged side by side between the headers 1, 1-1 and the refrigerant outlet headers 2, 2-1, and the microchannel heat exchange tubes 6, 6-1 There are at least three layers, each layer is provided with a water flow channel 5, 5-1, the microchannel heat exchange tube 6, 6-1 is attached to the surface of the water flow channel 5, 5-1, and the water flow channel 5 , 5-1 is a reciprocating circuitous structure, the water flow direction in the water flow channel 5, 5-1 and the flow direction of the refrigerant in the microchannel heat exchange tube 6, 6-1 are perpendicular to each other, and the water flow The upper ends of the channels 5, 5-1 are provided with cold water inlets 3, 3-1, and the lower ends of the water flow channels 5, 5-1 are provided with cold water outlets 4, 4-1.

The microchannel heat exchange tubes 6 and 6-1 are flat tubes, that is, their cross-sectional shape is approximately rectangular. The microchannel heat exchange tubes 6 and 6-1 adopt a flat tube structure as the condenser of the heat pump water heater, and can be welded in a furnace according to the design structure, effectively ensuring the welding quality. In addition, the micro-channel heat exchange tubes 6 and 6-1 can effectively reduce the amount of condenser materials and reduce costs under the same heat transfer capacity. At the same time, the amount of refrigerant charge is reduced, and the pressure bearing capacity is better than that of circular tube condensers. The system It is more reliable to work under high pressure.

Figure 1 shows the first specific structure. Figure 4 and Figure 5 are respectively a schematic top view and a schematic front view of Figure 1, and Figure 6 (A) and (B) are a schematic diagram of a left view and a right view of Figure 1, respectively. It can be seen from the drawing that the microchannel heat exchange tubes 6 are at least divided into three layers of independent structures, that is, the two ends of each layer of microchannel heat exchange tubes 6 are respectively connected to a refrigerant inlet header 1 and a refrigerant outlet header 2; the two ends of the refrigerant inlet header 1 in these three layers are uniformly connected to each other through a three-way pipe (not shown in the figure) and the refrigerant circulation system (not shown in the figure) The two ends of the refrigerant outlet header pipe 2 in these three layers are also uniformly communicated and then communicated with the refrigerant circulation system through another three-way pipe.

Figure 2 shows the second specific structure. The microchannel heat exchange tube 6-1 has at least three layers, that is, the three layers of microchannel heat exchange tubes 6-1 are all connected to each other, and the cross-sectional structure of the overall shape after the connection is serpentine or S-shaped (as shown in Figure 3A). After being connected, an end and a tail are formed, the end is connected with a refrigerant inlet header 1-1, and the tail is connected with a refrigerant outlet header 2-1. The refrigerant inlet header 1-1 and the refrigerant outlet header 2-1 are arranged at the same end of the microchannel heat exchange tube 6-1 or respectively arranged at both ends of the microchannel heat exchange tube 6-1. The refrigerant inlet header 1-1 and the refrigerant outlet header 2-1 are respectively communicated with a refrigerant circulation system (not shown in the figure).

Fig. 3, wherein: (A) is the schematic diagram of the working principle of the microchannel heat exchange tube 6-1 shown in Figure 2 and the water flow channel 5-1; (B) is the microchannel heat exchange tube 6 and shown in Figure 1 Schematic diagram of the working principle of the water flow channel 5 . The difference is that the flow direction of the refrigerant D in the figure (B) is the same, while the flow direction of the refrigerant E in the figure (A) is a circuitous distribution.

Fig. 7 is a schematic diagram of the water flow channels 5 and 5-1 in Fig. 1 and Fig. 2, and it can be seen that their structures are all in the form of circuitous channels. Specifically, partitions can be provided inside the water flow channels 5 and 5-1, and the partitions are used to block the direction of water flow. With the help of the partition, a circuitous flow channel is formed from the cold water inlet 3 to the hot water outlet 4, and the water flow direction F is perpendicular to the flow directions of the refrigerants D and E, forming a cross flow.

Just can realize the utility model preferably as mentioned above.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the above-mentioned embodiment, and any other changes, modifications and substitutions made without departing from the spirit and principle of the present utility model , combination, and simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (5)

1. micro-channel condenser that is used for Teat pump boiler; Comprise refrigerant inlet header, refrigerant outlet header; Between refrigerant inlet header and refrigerant outlet header, be distributed with many Thermal Performance of Micro Channels pipes side by side; It is characterized in that: said Thermal Performance of Micro Channels pipe has three layers at least, and each layer is provided with water flow channel, fits in said Thermal Performance of Micro Channels pipe and water flow channel surface; Said water flow channel is reciprocal winding type structure; Water (flow) direction and the mutual square crossing of the flow direction of cold-producing medium in the Thermal Performance of Micro Channels pipe in the said water flow channel, the upper end of said water flow channel is provided with cooling water inlet, and the lower end of water flow channel is provided with hot water outlet.

2. the micro-channel condenser that is used for Teat pump boiler according to claim 1; It is characterized in that: said Thermal Performance of Micro Channels pipe is divided into three layers of absolute construction at least, and promptly the two ends of each layer Thermal Performance of Micro Channels pipe all connect a refrigerant inlet header and a refrigerant outlet header respectively; The two ends of the refrigerant inlet header in these three layers are unified to be communicated with refrigerant-cycle systems through three-way pipe after the intercommunication; Be communicated with refrigerant-cycle systems through another three-way pipe after the also unified intercommunication in the two ends of the refrigerant outlet header in these three layers.

3. the micro-channel condenser that is used for Teat pump boiler according to claim 1; It is characterized in that: said Thermal Performance of Micro Channels pipe has three layers at least; Promptly all be interconnected between three layers of Thermal Performance of Micro Channels pipe, the cross section structure that is communicated with the back global shape is snakelike or S shape Thermal Performance of Micro Channels pipe, and is communicated with an end of formation, back and an afterbody; Its end is connected with a refrigerant inlet header, and its afterbody is connected with a refrigerant outlet header.

4. the micro-channel condenser that is used for Teat pump boiler according to claim 3 is characterized in that: said refrigerant inlet header and refrigerant outlet header are arranged on the same end of Thermal Performance of Micro Channels pipe or are separately positioned on the two ends of Thermal Performance of Micro Channels pipe.

5. according to each described micro-channel condenser that is used for Teat pump boiler in the claim 1～4, it is characterized in that: said Thermal Performance of Micro Channels pipe is the Thermal Performance of Micro Channels flat tube, i.e. the rectangular structure of its cross sectional shape.

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