CN206817822U - Micro-channel heat exchanger and heat pump water heater - Google Patents

Abstract

The utility model discloses microchannel heat exchanger relates to heat exchange technical field, and its purpose is in order to provide a simple structure, heat exchange efficiency height, safe and reliable's microchannel heat exchanger and heat pump water heater. The utility model discloses a microchannel heat exchanger comprises a first collecting pipe, a second collecting pipe, a third collecting pipe and a plurality of flat pipes, wherein the first collecting pipe, the second collecting pipe and the third collecting pipe are respectively provided with a first interface, a second interface and a third interface which are communicated with a system pipeline; the third collecting pipe is arranged between the first collecting pipe and the second collecting pipe, and the first collecting pipe and the third collecting pipe and the second collecting pipe and the third collecting pipe are communicated through a plurality of flat pipes; the refrigerant in-out direction of the first interface is the same as that of the second interface, and the refrigerant in-out direction of the first interface is opposite to that of the third interface, the first collecting pipe, the third collecting pipe and the flat pipe between the first collecting pipe and the third collecting pipe form a first flow path, and the second collecting pipe, the third collecting pipe and the flat pipe between the second collecting pipe and the third collecting pipe form a second flow path.

Description

Micro-channel heat exchanger and heat pump water heater

technical field

The utility model relates to the technical field of heat exchange, in particular to a microchannel heat exchanger and a heat pump water heater.

Background technique

Due to its large contact area, high heat transfer performance, small pressure loss, compact structure and cost advantages, micro-channel heat exchangers are gradually being used in commercial and domestic refrigeration systems. At present, the water tank heat exchanger of the wall-mounted air energy heat pump water heater mostly adopts the micro-channel heat exchanger.

Existing microchannel heat exchangers, with reference to Figures 1-4, are generally composed of two headers 10' and a plurality of flat tubes 40' containing micropores. The collecting pipes are installed at both ends of the flat pipes, and a plurality of flat pipes are structurally installed in parallel, and the microchannels are divided into multiple flow paths through the spacers 60' of the collecting pipes. By one or more connecting plates between two headers, many microchannels are wrapped around the water tank liner 70'. Since there is no external power, the flow comes entirely from the density change of the water heated by the microchannel heat exchanger, and the natural convection occurs under the action of the gravity field. The density of water decreases when heated, so the hot water is in the upper part of the tank and the cold water is in the lower part of the tank.

But for the wall-mounted air energy heat pump water heater, each microchannel flow path of the microchannel heat exchanger with this structure flows from one header to another, and will inevitably exchange heat with high-temperature water on the way. Multiple flow paths form a series relationship through the diaphragm, then the refrigerant in the micro-channel heat exchanger will frequently exchange heat with high-temperature water, and the purpose of the micro-channel heat exchanger is to heat the water in the water tank, that is, to exchange with cold water Therefore, frequent heat exchange with high-temperature water will cause problems such as low heat exchange efficiency of the heat exchanger and high system pressure.

Utility model content

Based on this, the technical problem to be solved by the utility model is to provide a microchannel heat exchanger and a heat pump water heater with simple structure, high heat exchange efficiency, safety and reliability.

A microchannel heat exchanger comprising a first header, a second header, a third header and several flat tubes, the first header, the second header, and the third header The first interface, the second interface and the third interface which communicate with the system pipes are respectively arranged on the top; the third header is arranged between the first header and the second header, and the first header The connection between the tube and the third header and between the second header and the third header are communicated through several flat tubes; the direction of refrigerant entering and exiting the first interface is the same as that of the second interface, and Both are opposite to the direction of the refrigerant entering and exiting the third interface, the first header, the third header, and the flat tubes between them form a first flow path, the second header, the third header The headers and the flat tubes between them form the second flow path.

In one of the embodiments, the first header, the second header, and the third header are all provided with a divider, and the first flow path and the second flow pass through the divider. An S-shaped flow path is formed.

In one of the embodiments, the first header is arranged opposite to the cut-off portion in the second header, and is set in a dislocation with the cut-off portion in the third header; the first interface, the second The two interfaces are respectively arranged at the same end of the first header and the second header, and the third interface is arranged at the end of the third header opposite to the first interface and the second interface.

In one of the embodiments, the cut-off part is several spacers.

In one of the embodiments, the first header, the second header, and the third header are arranged in parallel, and several flat tubes are arranged in parallel and spaced apart, and are connected with the first header, the second header, and the second header. The tube is perpendicular to the third header.

A heat pump water heater, comprising the micro-channel heat exchanger described above, the micro-channel heat exchanger is arranged on the water tank liner of the heat pump water heater, and the first flow path and the second flow path surround the outer wall of the water tank liner set, and all flow through the high temperature water zone on the upper part of the water tank liner and the low temperature water zone on the lower part of the water tank liner.

In one of the embodiments, the first collecting pipe and the second collecting pipe are arranged in the low-temperature water area of the lower part of the inner tank of the water tank, and the third collecting pipe is arranged in the high-temperature water area of the upper part of the inner tank of the water tank. A water area; the third interface is a refrigerant inlet, and the first and second interfaces are refrigerant outlets.

In one of the embodiments, the first collecting pipe and the second collecting pipe are arranged in the high-temperature water area above the water tank liner, and the third collecting pipe is arranged in the low-temperature water area in the lower part of the water tank liner. A water area; the first interface and the second interface are refrigerant inlets, and the third interface is a refrigerant outlet.

In one of the embodiments, the first port of the first header and the second port of the second header are communicated and connected through a connecting pipe, and are covered and fixed with the water tank liner through the connecting pipe .

In the above-mentioned microchannel heat exchanger, by installing three headers at both ends and in the middle of the flat tube, the flow flows from the third header in the middle to the first header, the second header at both ends, or from the first header at both ends. The first header and the second header flow to the third header in the middle. Adjusting the refrigerant flow mode of the entire microchannel can reduce the heat exchange between the refrigerant and high-temperature water and improve the condensation heat transfer performance of the microchannel heat exchanger.

Description of drawings

Fig. 1 is the structural representation of existing microchannel heat exchanger;

Fig. 2 is the assembly schematic diagram of existing microchannel heat exchanger and water tank liner;

Fig. 3 is the left view of Fig. 2;

Fig. 4 is the top view of Fig. 2;

Fig. 5 is a structural schematic diagram 1 of the microchannel heat exchanger of the present invention, which shows that the two ends of the refrigerant enter the middle and exit;

Fig. 6 is the assembly drawing of microchannel heat exchanger and water tank liner in Fig. 5;

Fig. 7 is the left view of Fig. 6;

Figure 8 is a top view of Figure 6;

Fig. 9 is a structural schematic diagram 2 of the microchannel heat exchanger of the present invention, which shows that the refrigerant enters in the middle and exits at both ends;

Fig. 10 is an assembly diagram of the microchannel heat exchanger and the water tank liner in Fig. 9;

Fig. 11 is the left view of Fig. 10;

Figure 12 is a top view of Figure 10;

Explanation of reference signs:

Collector 10'; flat tube 40'; spacer 60'; water tank liner 70';

The first header 100; the first interface 110;

The second header 200; the second interface 210;

The third header 300; the third interface 310;

flat tube 400;

The first flow path 510; the second flow path 520;

Spacer 600;

Water tank liner 700;

Connect the pipe 800 .

detailed description

The specific embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, but the utility model can be implemented in various ways defined and covered by the claims.

Referring to FIG. 5 , the microchannel heat exchanger in one embodiment of the present invention includes a first header 100 , a second header 200 , a third header 300 and several flat tubes 400 . The first header 100 , the second header 200 , and the third header 300 are respectively provided with a first interface 110 , a second interface 210 and a third interface 310 communicating with system pipes. The third header 300 is disposed between the first header 100 and the second header 200, between the first header 100 and the third header 300 and between the second header 200 and the third header. The flow tubes 300 are connected through several flat tubes 400 . The flat tube 400 is provided with a microchannel, and the first header 100 , the third header 300 and the flat tube 400 between them form a first flow path 510 through which the refrigerant flows. The second header 200 , the third header 300 and the flat tube 400 between them form a second flow path 520 through which the refrigerant flows.

The above-mentioned microchannel heat exchanger installs three headers at both ends and in the middle of the flat tube 400, and flows from the third header 300 in the middle to the first header 100, the second header 200 or the first header 200 at both ends. From the first header 100 and the second header 200 at both ends to the third header 300 in the middle, adjusting the refrigerant flow mode of the entire microchannel can reduce the heat exchange between the refrigerant and high-temperature water and improve the microchannel heat exchanger. condensing heat transfer performance.

Furthermore, the first header 100, the second header 200, and the third header 300 are all provided with flow partitions, and the first flow path 510 and the second flow path 520 form an S shape through the flow partitions. flow path. Specifically, the first header 100 is arranged opposite to the divider in the second header 200 , and is arranged in a dislocation with the divider in the third header 300 . The first interface 110 and the second interface 210 are respectively arranged at the same end of the first header 100 and the second header 200, and the third interface 310 is arranged on the third header 300 to be connected with the first interface 110 and the second header 200. The opposite end of the interface 210. The flow blocking part is specifically a plurality of spacers 600 arranged at intervals. When the spacer 600 is provided, the refrigerant first collects from the first header 100 and the second header 200 to the third header 300, and then flows to the first header 100 and the second header respectively. 200 split, and then converged to the third header 300, so repeated flow, forming a multi-stroke flow path. When the separator 600 is not provided, after the refrigerant is collected from the first header 100 and the second header 200 to the third header 300 , it flows out directly from the third header 300 to form a single-pass flow path.

In one embodiment, the first header 100, the second header 200, and the third header 300 are arranged in parallel, and several flat tubes 400 are arranged in parallel at equal intervals, and are connected to the first header 100, the second The header 200 and the third header 300 are vertical. Preferably, the lengths of the three headers are equal, and the flat tubes between the two headers are arranged symmetrically, so the first flow path 510 and the second flow path 520 are symmetrical, and the flow paths are in opposite directions.

As shown in Figures 6-8, the above-mentioned micro-channel heat exchanger is applied in a heat pump water heater. The micro-channel heat exchanger is arranged on the water tank liner 700 of the heat pump water heater and is wrapped around the outer wall of the water tank liner 700 . The water tank liner 700 is arranged horizontally, the upper part of the water tank liner 700 is a high-temperature water area, and the lower part is a low-temperature water area. The first flow path 510 and the second flow path 520 are arranged around the water tank liner 700 , and both flow through the high temperature water area and the low temperature water area of the water tank liner 700 .

Further, as shown in FIG. 8 , the first interface 110 of the first header 100 and the second interface 220 of the second header 200 are communicated and connected through the connecting pipe 800 , and are covered and fixed with the water tank liner 700 through the connecting pipe 800 . Specifically, the first port 110 of the first header 100 and the second port 210 of the second header 200 are connected to the connecting pipe, and the connecting pipe 800 is connected to the system pipe, which is not only used to transport refrigerant, but also can transfer micro The channel heat exchanger is covered and fixed on the water tank liner 700 .

The heat exchange method between the micro-channel heat exchanger and the water tank liner 700 in the heat pump water heater can be divided into the following two types:

Method 1, the two ends of the refrigerant enter the middle and exit:

As shown in FIGS. 5-8 , the first collecting pipe 100 and the second collecting pipe 200 are arranged on the upper part of the water tank liner 700 , and the third collecting pipe 300 is arranged on the lower part of the water tank liner 700 . In the micro-channel heat exchanger with this structure, the third header 300 is arranged in the upper half of the water tank liner 700, in the high-temperature water heat exchange area A; the first and second headers 200 at both ends are in the water tank liner The lower half of 700 is in the low temperature water heat exchange area B.

After the refrigerant enters the microchannel heat exchanger from the first interface 110 (refrigerant inlet at this time) of the first header 100 on both sides and the second interface 210 (refrigerant inlet at this time) of the second header 200, respectively enter the flat tubes 400 on both sides of the water tank, and finally flow out from the third interface 310 (the refrigerant outlet at this time) of the third header 300 .

When the header is provided with a spacer 600, after the refrigerant enters from the first header 100 and the second header 200 on both sides, it first collects in the third header 300 in the middle, then diverts to both ends, and then Converge in the middle, and flow in this way repeatedly to form a multi-stroke flow path. When there is no spacer 600 in the header, the refrigerant enters from the first and second headers 200 on both sides, then enters the flat tubes 400 on both sides of the water tank respectively, forming two strokes, and finally flows out from the third header 300 .

Method 2, the refrigerant enters in the middle and exits at both ends:

As shown in FIGS. 9-12 , the first collecting pipe 100 and the second collecting pipe 200 are arranged at the lower part of the water tank liner 700 , and the third collecting pipe 300 is arranged at the upper part of the water tank liner 700 . In the micro-channel heat exchanger with this structure, the first and second headers at both ends are arranged in the upper half of the water tank liner 700, in the high-temperature water heat exchange area A; the third header pipe 300 is located in the water tank liner 700 The lower part is in the low temperature water heat exchange area B.

The refrigerant enters from the third interface 310 of the third header 300 (refrigerant inlet at this time), and enters the flat tubes 400 on both sides of the water tank at the same time, and finally from the first interface 110 of the first header 100 (refrigerant outlet at this time) ), the second port 210 (the refrigerant outlet at this time) of the second header 200 flows out.

When the spacer 600 is installed in the header, the refrigerant enters from the third header 300 in the middle, diverts to both sides and enters the first and second headers 200, and then gathers in the middle. Repeated flow in this way forms multiple Itinerary flow. When there is no spacer 600 in the header, the refrigerant enters from the third header 300 in the middle, diverts to both sides and enters the first and second headers 200 to form two strokes, and finally flows from the third header 300 outflows.

The above two heat transfer methods are compared with the single-stroke method of ordinary two microchannel heat exchangers:

1. In the microchannel heat exchanger with diaphragm structure, the total number of times each stroke flows through the high-temperature water heat exchange area A will be doubled;

2. In each stroke of the micro-channel heat exchanger with no diaphragm structure, the refrigerant flows directly from the high-temperature water heat exchange area A to the low-temperature water heat exchange area B, and then flows out of the heat exchanger, no longer flowing through the high-temperature water heat exchange area a.

The fewer times the refrigerant passes through the high-temperature water heat exchange area A, the better the heat exchange effect of the system, and the problems of high system pressure and high exhaust will be greatly alleviated. The condensation heat transfer performance of the microchannel heat exchanger in the water tank of the heat pump water heater is enhanced.

The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (9)

1. a microchannel heat exchanger is characterized in that, comprises the first header (100), the second header (200), the third header (300) and some flat tubes (400), the The first header (100), the second header (200), and the third header (300) are respectively provided with a first interface (110), a second interface (210) and a The third interface (310); the third header (300) is arranged between the first header (100) and the second header (200), and the first header (100) and the second header (200) Between the third headers (300) and between the second header (200) and the third header (300) are communicated through several flat tubes (400); the first interface (110) The refrigerant inlet and outlet directions of the second interface (210) are the same as the refrigerant inlet and outlet directions of the third interface (310), and the first header (100), the third header (300) ), and the flat tube (400) between the two forms the first flow path (510), the second header (200), the third header (300), and the flat tube ( 400) forming a second flow path (520). 2. The microchannel heat exchanger according to claim 1, characterized in that, the first header (100), the second header (200), and the third header (300) are all provided with There is a flow partition, and the first flow path (510) and the second flow path (520) both form an S-shaped flow path through the flow partition. 3. The microchannel heat exchanger according to claim 2, characterized in that, the first header (100) is arranged opposite to the partition in the second header (200), and is arranged opposite to the third header (200). The divider in the header (300) is set in a misplaced position; the first interface (110) and the second interface (210) are respectively arranged at the ends of the first header (100) and the second header (200). At the same end, the third interface (310) is arranged on the end of the third header (300) opposite to the first interface (110) and the second interface (210). 4. The microchannel heat exchanger according to claim 2 or 3, characterized in that, the cutoff part is a plurality of spacers (600). 5. The microchannel heat exchanger according to claim 1, characterized in that, the first header (100), the second header (200) and the third header (300) are arranged in parallel, Several flat tubes (400) are arranged in parallel and at intervals, and are perpendicular to the first header (100), the second header (200) and the third header (300). 6. A heat pump water heater, characterized in that, comprising the microchannel heat exchanger as claimed in any one of claims 1-5, said microchannel heat exchanger being arranged on the water tank liner (700) of the heat pump water heater, The first flow path (510) and the second flow path (520) are arranged around the outer wall of the water tank liner (700), and both flow through the high-temperature water area on the upper part of the water tank liner (700) and the water tank liner ( 700) lower low temperature water zone. 7. The heat pump water heater according to claim 6, characterized in that, the first collecting pipe (100) and the second collecting pipe (200) are arranged in the low-temperature water area at the lower part of the water tank liner (700) , the third header (300) is set in the high-temperature water area on the upper part of the water tank liner (700); the third interface (310) is the refrigerant inlet, and the first interface (110) and the second The interface (210) is a refrigerant outlet. 8. The heat pump water heater according to claim 6, characterized in that, the first collecting pipe (100) and the second collecting pipe (200) are arranged in the high-temperature water area on the upper part of the water tank liner (700) , the third header (300) is set in the low-temperature water area at the lower part of the water tank liner (700); the first interface (110) and the second interface (210) are refrigerant inlets, and the third The interface (310) is a refrigerant outlet. 9. The heat pump water heater according to claim 6, characterized in that, the first interface (110) of the first header (100) and the second interface (210) on the second header (200) The connecting pipe (800) is communicated and connected, and the water tank liner (700) is wrapped and fixed through the connecting pipe (800).