Box-shaped stacked heat exchanger with fine flow channels on the through-hole wall of the pad

Abstract

The box-shaped stacked heat exchanger with fine flow channels on the through-hole wall of the pad is composed of a plurality of box-shaped heat exchange plates with inclined surfaces on the periphery stacked in sequence. In the box-shaped stacked heat exchanger, on each heat exchange plate, there is a heat exchange device for inter-wall heat exchange, and there are through holes for heat exchange medium to flow. The through holes are distributed at both ends of each heat exchange plate. There are pads on the through holes at both ends of the heat exchange plate and on the extended plane around the through holes. The pads have a certain thickness and there are through holes for heat exchange medium to flow on the pads. The heat exchange device is located in the middle of each heat exchange plate and contacts the pads located at both ends of the heat exchange plate. The characteristic is that there are fine flow channels communicating with the heat exchange device on the through-hole wall of the pad.

Description

Technical Field

[0001] The invention relates to a heat exchanger, in particular to a box-shaped stacked heat exchanger with fine flow channels on the through-hole wall of a pad. Background Art

[0002] The box-shaped stacked heat exchanger with fine flow channels on the through-hole wall of the pad is composed of a plurality of box-shaped heat exchange plates with inclined surfaces on the periphery which are stacked in sequence. In the box-shaped stacked heat exchanger, on each heat exchange plate, there is a heat exchange device for inter-wall heat exchange, and there are through holes for the circulation of heat exchange medium. The through holes are distributed at both ends of each heat exchange plate. There are pads on the through holes at both ends of the heat exchange plate and on the extended plane around the through holes. The pads have a certain thickness and there are through holes for the circulation of heat exchange medium. The heat exchange device is located in the middle of each heat exchange plate and contacts with the pads located at both ends of the heat exchange plate.

[0003] The prior art with pads in similar box-shaped stacked heat exchangers has been disclosed in five patents, namely, 2013104395763, 2013104395778, 2016213977419, 2017209670864, ​​and 2019202010538. These five disclosed patents all describe the existence of pads similar to those described in this specification. However, none of these five patents discusses whether there are fine flow channels on the wall of the pad through hole that communicate with the heat exchange device.

[0004] When the box-shaped stacked heat exchanger is used as an evaporator of a refrigeration (heat pump) cycle, after the liquid and liquid-gas mixed refrigerant enters the refrigerant inlet channel of the box-shaped stacked heat exchanger, since the refrigerant at this time has strong evaporation, the through-hole walls formed by the stacking of the heat exchange plates and pads for circulating the refrigerant do not have small flow channels connected to the heat exchange device, but are open, similar to one of the structures described in Patent 2017209670864. The liquid and liquid-gas mixed refrigerant will evaporate and exchange heat with the front row heat exchange devices in the open refrigerant channel just after entering the box-shaped stacked heat exchanger, while the heat exchange efficiency of the heat exchange devices in the back rows is significantly lower than that of the front row, and the heat exchange efficiency of the heat exchange devices in the back rows is lower.

[0005] The distribution of the refrigerant inside the refrigerant evaporator will make it impossible for the liquid and liquid-gas mixed refrigerant to be evenly distributed in the heat exchange devices of each layer of the box-shaped stacked heat exchanger. Even in the box-shaped stacked heat exchanger with a large number of stacked layers, there will be almost no refrigerant flowing through the last few rows of heat exchange devices. The refrigerant has already evaporated and exchanged heat through the heat exchange with the heat exchange medium in the heat exchange devices of the previous layers. In this way, the media in the last few rows that exchange heat with the refrigerant walls will have almost no heat exchange effect, which significantly reduces the heat exchange efficiency of the entire box-shaped stacked heat exchanger. Summary of the invention

[0006] The main purpose of the present invention is to enable the box-shaped stacked heat exchanger with a pad to be used as a refrigerant evaporator so that the liquid and liquid-gas mixed refrigerant can be more evenly distributed to each layer of the heat exchange device after entering the inlet channel of the box-shaped stacked heat exchanger, thereby having the effect of evenly distributing the refrigerant.

[0007] The purpose of the present invention is achieved by adopting the following scheme: a box-shaped stacked heat exchanger with fine flow channels on the through-hole wall of the pad is composed of a plurality of box-shaped heat exchange plates with inclined surfaces on the periphery, which are stacked in sequence. In the box-shaped stacked heat exchanger, on each heat exchange plate, there is a heat exchange device for inter-wall heat exchange, and there are through holes for heat exchange medium to flow. The through holes are distributed at both ends of each heat exchange plate. There are pads on the through holes at both ends of the heat exchange plate and on the extended plane around the through holes. The pads have a certain thickness and there are through holes for heat exchange medium to flow on the pads. The heat exchange device is located in the middle of each heat exchange plate and contacts the pads located at both ends of the heat exchange plate. It is characterized in that on the through-hole wall of the pad, there is a fine flow channel communicating with the heat exchange device.

[0008] The flow direction of the fine flow channel is directional.

[0009] The height of the small flow channel is the same as the thickness of the pad, and the width of the small flow channel is a narrow space flow channel.

[0010] The fine flow channel is located in the pad in a groove shape, and the depth of the groove is less than the thickness of the pad.

[0011] The cross section of the fine flow channel is circular and is located within the thickness of the pad.

[0012] The small flow channel has a certain length.

[0013] The present invention has the following advantages and positive effects:

[0014] 1. When liquid and liquid-gas mixed refrigerant enters the refrigerant inlet channel of the box-shaped stacked heat exchanger, although the refrigerant is highly volatile at this time, the flow channels on the through-hole walls of each pad of the refrigerant channel that flow to the heat exchange device are small, which can inhibit the evaporation of the liquid and liquid-gas mixed refrigerant, and allow the liquid and liquid-gas mixed refrigerant to flow into each small flow channel after completely filling the refrigerant channels formed by all heat exchange plates and pad through-holes. Since the liquid and liquid-gas mixed refrigerant continuously flows into the channel, the liquid level of the liquid and liquid-gas mixed refrigerant rises almost evenly and equally in the small flow channels on the through-hole walls of each pad, and enters all heat exchange devices almost evenly and equally, thereby allowing the liquid and liquid-gas mixed refrigerant to evenly perform inter-wall heat exchange with the same heat exchange efficiency in all refrigerant layers of heat exchange devices.

[0015] 2. This can greatly improve the heat exchange efficiency.

[0016] 3. This can reduce the number of heat exchange plates and heat exchange channel layers, which can significantly reduce product costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 AA section partial enlarged schematic diagram

[0019] Figure 2 Schematic diagram of box-shaped stacked heat exchange plates with fine flow channels 5

[0020] Figure 3 BB section partial enlarged schematic diagram

[0021] Figure 4 Schematic diagram of box-shaped stacked heat exchange plates with fine flow channels 5a

[0022] Figure 5 CC section partial enlarged schematic diagram

[0023] Figure 6 Schematic diagram of box-shaped stacked heat exchange plates with fine flow channels 5b

[0024] Figure 7 DD section partial enlarged schematic diagram

[0025] Figure 8 Schematic diagram of box-shaped stacked heat exchange plates with fine flow channels 5c DETAILED DESCRIPTION

[0026] The following is a further description with reference to the embodiments and drawings.

[0027] In all the figures, mark 1 indicates a box-shaped stacked heat exchange plate; mark 2 indicates a through hole in the heat exchange plate and on the gasket; mark 3 indicates a heat exchange device located in the middle of the heat exchange plate; marks 4, 4a, 4b, 4c indicate gaskets located at both ends of the heat exchange plate; marks 5, 5a, 5b, 5c indicate that there are small flow channels on the wall of a through hole in the gasket, which are connected to the heat exchange device, and these small flow channels 5, 5a, 5b, 5c have a certain length and a certain flow direction.

[0028] The height of the small flow channel marked 5 is the same as the thickness of the pad, and the width of the flow channel is a narrow space flow channel.

[0029] The small flow channel marked 5a is a groove with a circular arc at the bottom. Of course, the cross-section of the bottom of the groove is not limited to a circular arc, and may also be a trapezoid, a triangle, a right-angled rectangle, etc. The depth of the groove is less than the thickness of the pad, and the width of the groove is a narrow space flow channel.

[0030] The thin flow channel marked 5b is tubular with a circular cross section. Of course, its tubular cross section is not limited to a circle.

[0031] The small flow channel marked with 5c indicates that the flow direction of the small flow channel can have different directions and positions. Of course, the flow direction and position are not limited to Figure 8 shown.

Claims

1. A box-shaped stacked heat exchanger with fine flow channels on the through-hole wall of the pad, the heat exchanger is composed of a plurality of box-shaped heat exchange plates with inclined surfaces on the periphery, which are stacked in sequence. In the box-shaped stacked heat exchanger, on each heat exchange plate, there is a heat exchange device for inter-wall heat exchange, and there are through holes for heat exchange medium to flow, the through holes are distributed at both ends of each heat exchange plate, and there are pads on the through holes at both ends of the heat exchange plate and on the extended plane around the through holes, the pads have a certain thickness, and there are through holes for heat exchange medium to flow on the pads, the heat exchange device is located in the middle of each heat exchange plate and contacts with the pads located at both ends of the heat exchange plate, characterized in that: On the through hole wall of the pad, there is a small flow channel connected to the heat exchange device.

2. The heat exchanger according to claim 1, characterized in that: The small flow channel has a certain length.

3. The heat exchanger according to claim 1, characterized in that: The height of the small flow channel is the same as the thickness of the pad, and the width of the small flow channel is a narrow space flow channel.

4. The heat exchanger according to claim 1, characterized in that: The fine flow channel is located in the pad in a groove shape, and the depth of the groove is less than the thickness of the pad.

5. The heat exchanger according to claim 1, characterized in that: The cross section of the fine flow channel is circular and is located within the thickness of the pad.

6. The heat exchanger according to claim 1, characterized in that The flow direction of the fine flow channel is directional.

Images