Liquid retaining structure, heat exchanger and air conditioner

Abstract

The present invention discloses a liquid retaining structure, a heat exchanger and an air conditioner, comprising: a shell, an inner shell arranged inside the shell for covering a heat exchange coil, an airway area formed by the gap between the shell and the inner shell, a refrigerant outlet arranged on the upper part of the shell corresponding to the airway area, and a liquid retaining assembly arranged in the airway area. The present invention adopts a multi-layer inner coil heat exchange tube, and the heat exchange tube in the falling film area is covered with a cylinder, so that an annular space is formed between the cylinder and the shell, and the gaseous refrigerant is discharged upward from the surrounding annular areas, and a liquid retaining structure and a filter device are installed between the inner shell and the shell, and when the gas flows upward, the inertia impacting the liquid retaining device is used to separate the splashing droplets, and the droplets flow into the full liquid area by gravity, so as to prevent the compressor from sucking in liquid, enhance the heat exchange performance of the unit, and save the refrigerant filling amount.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a liquid blocking structure, a heat exchanger and an air conditioner. Background Art

[0002] With the continuous progress of society, the demand for commercial air conditioners is increasing. At the same time, user needs are diverse, and there are high requirements for the performance, size, quality and cost of heat exchangers. There are some common problems with the compact heat exchangers currently on the market, the most important of which is the turbulent flow field of the gaseous refrigerant, which easily causes the compressor to carry liquid in the air, which in turn leads to low heat exchange efficiency of the heat exchanger and unsatisfactory unit performance. Summary of the invention

[0003] In order to solve the technical problem of liquid inhalation during operation of an air conditioning system in the prior art, the present invention provides a liquid blocking structure, a heat exchanger and an air conditioner.

[0004] The technical solution adopted by the present invention is:

[0005] The present invention proposes a liquid blocking structure, comprising: a shell, an inner shell arranged inside the shell for covering a heat exchange coil, the gap between the shell and the inner shell forming an air duct area surrounding the inner shell, a refrigerant outlet is arranged at the upper part of the shell corresponding to the air duct area, and the air duct area is provided with a liquid blocking component.

[0006] Preferably, the shell is a cylinder closed at the top and bottom, the inner shell is an inner cylinder penetrating from top to bottom, the top of the inner cylinder is connected to the top of the cylinder, a refrigerant inlet is arranged at the top of the shell, and the refrigerant inlet is connected to the area surrounded by the inner cylinder.

[0007] In one embodiment, the liquid blocking assembly includes: a first liquid blocking plate connected between the bottom of the inner cylinder and the inner wall of the cylinder, the first liquid blocking plate is provided with a plurality of air guide holes, the first liquid blocking plate gradually increases in diameter from top to bottom, and a gap is left between the first liquid blocking plate and the inner wall of the cylinder.

[0008] In another embodiment, the liquid blocking assembly includes: a first liquid blocking plate connected between the bottom of the inner cylinder and the inner wall of the cylinder, the first liquid blocking plate gradually increases in diameter from top to bottom, and a gap is left between the first liquid blocking plate and the inner wall of the cylinder.

[0009] The liquid blocking assembly further comprises: at least one second liquid blocking plate connected to the inner wall of the outer tube, wherein the second liquid blocking plate surrounds the inner edge of the inner tube and is bent downward to form a second folded edge.

[0010] For example, the liquid blocking assembly further includes: at least one third liquid blocking plate connected to the outer wall of the inner tube, and the edge of the third liquid blocking plate is bent downward by a third folded edge.

[0011] Further, one of the third liquid baffles and one of the second liquid baffles form a group of liquid baffles, the second liquid baffles and the third liquid baffles in each group of the liquid baffles are arranged at intervals, and the second liquid baffle is located above the third liquid baffle, and the liquid baffle surfaces of the second liquid baffle and the third liquid baffle are inclined downward.

[0012] A flow equalizing plate is provided inside the inner shell, and the flow equalizing plate is located between the refrigerant inlet and the heat exchange coil.

[0013] Furthermore, the airway area is also provided with a filter device, and the filter device is located above the liquid blocking component.

[0014] The present invention also provides a heat exchanger, comprising the above-mentioned liquid blocking structure.

[0015] The heat exchanger specifically comprises: a first heat exchange coil arranged in the inner shell, and a second heat exchange coil arranged in the outer shell and below the inner shell.

[0016] The present invention also includes an air conditioner, comprising the above-mentioned heat exchanger.

[0017] Compared with the prior art, the present invention adopts a multi-layer inner coil heat exchange tube to increase the heat exchange contact area between the refrigerant and the heat exchange tube. The evaporated gas flows downward from the central airway space of the inner coil heat exchange tube bundle, ensuring that the gas flows more smoothly and with less resistance. The interior of the heat exchanger adopts a falling film area and a full liquid area. The heat exchange tube in the falling film area is covered with a cylinder to form an annular space between the cylinder and the shell. The gaseous refrigerant is discharged upward from the surrounding annular areas. A liquid retaining structure and a filter device are installed between the inner body and the shell. When the gas flows upward, the inertia impacts the liquid retaining device to separate the splashing droplets. The droplets flow into the full liquid area through gravity, preventing the compressor from inhaling liquid, enhancing the heat exchange performance of the unit, and saving the refrigerant injection amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the three-dimensional structure of the first liquid baffle plate in an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of the three-dimensional structure of the second liquid baffle plate in an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the three-dimensional structure of the third liquid baffle in the embodiment of the present invention.

[0023] 1. Cylinder; 11. Refrigerant inlet; 12. Refrigerant outlet;

[0024] 2. Inner cylinder; 31. First liquid retaining plate; 32. Second liquid retaining plate; 33. Third liquid retaining plate; 4. First heat exchange coil; 5. Second heat exchange coil; 6. Filter device; 7. Liquid equalizing plate. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0027] like Figure 1 As shown, the present invention proposes a liquid blocking structure, including: a shell and an inner shell, the inner shell is arranged inside the shell, and a heat exchange coil is installed inside the inner shell, that is, the inner shell covers the heat exchange coil, the annular spacer between the shell and the inner shell forms an airway area, and a refrigerant outlet 12 is provided on the upper part of the shell corresponding to the airway area, that is, the refrigerant flows upward along the airway and then flows out from the refrigerant outlet 12, and a liquid blocking component is provided in the airway area. The liquid refrigerant mixed in the gaseous refrigerant to flow out of the shell can be blocked by the liquid blocking component, and by using the effects of inertia and gravity, the refrigerant hits the liquid blocking component to separate the splashing droplets, and the separated gaseous refrigerant leaves the shell through the refrigerant outlet 12 on the upper part of the shell, and the liquid refrigerant returns to the full liquid area along the inner wall of the shell or the outer wall of the inner shell, and exchanges heat with the coil arranged in the full liquid area, thereby improving the heat exchange efficiency, thereby effectively preventing the evaporated refrigerant from entraining droplets and flowing out from the refrigerant outlet 12.

[0028] like Figure 1 As shown, in a specific embodiment, the shell is a cylinder 1 that is closed at the top and bottom, and the inner shell is an inner cylinder 2 that is connected at the top and bottom. The top of the inner cylinder 2 is connected to the inner wall of the top of the cylinder 1, and a refrigerant inlet 11 is arranged at the top of the shell, and the refrigerant can be input into the shell. The refrigerant inlet 11 is connected to the area surrounded by the inner cylinder 2. The area surrounded by the inner cylinder 2 is the falling film area, and the first heat exchange coil 4 is arranged in the falling film area. When the air-conditioning unit is running, the liquid refrigerant drips on the multi-layer inner coil heat exchange tube (first heat exchange coil 4) in the falling film area for heat exchange and evaporation, and the gaseous refrigerant leaves the falling film area through the central air channel in the middle of the first heat exchange coil 4. The full liquid area is located below the inner cylinder 2 in the shell, and the second heat exchange coil 5 is arranged in the full liquid area. The refrigerant that has not been fully heat exchanged and evaporated flows to the full liquid area for secondary heat exchange, thereby enhancing the heat exchange efficiency.

[0029] A liquid equalizing plate 7 is also provided in the inner tube 2, on which liquid equalizing holes are evenly arranged. The liquid equalizing plate 7 is horizontally arranged in the shape of a circular sheet, consistent with the inner diameter of the inner tube 2, connected to the inner wall of the inner tube 2, and located between the first heat exchange coil 4 and the top of the cylinder 1, so that the refrigerant entering the inner tube 2 from the refrigerant inlet 11 flows downward evenly, thereby improving the heat exchange efficiency.

[0030] It should be noted that the first and second heat exchange coils 5 adopt a new multi-layer inner coil structure, with an airway space in the center, which can increase the contact area of ​​the refrigerant and save shell space. The liquid level height in the full liquid area is about 3-15mm higher than the height of the heat exchange tube in the full liquid area, and the preferred height is 5mm to prevent the gaseous refrigerant from flowing too fast. The diameter of the inner cylinder 2 is smaller than the diameter of the heat exchanger shell (that is, the diameter difference between the cylinder 1 and the inner cylinder 2) and is controlled at 100-200mm. Through the analysis of the gas flow field and flow rate, the optimal solution is 150mm, which can prevent the gaseous refrigerant from flowing too fast and improve the heat exchange efficiency.

[0031] The liquid baffle assembly specifically includes: a first liquid baffle plate 31, a second liquid baffle plate 32 and a third liquid baffle plate 33. The first liquid baffle plate 31 is arranged at the bottom of the inner tube 2, and is connected between the bottom of the outer wall of the inner tube 2 and the inner wall of the cylinder body 1 in a ring shape. A plurality of air guide holes are evenly arranged on the first liquid baffle plate 31. The area between the first liquid baffle plate 31 and the top of the cylinder body 1 is an annular airway area, and the gas refrigerant carrying droplets after heat exchange in the full liquid area enters the airway area from the air guide holes.

[0032] In a preferred embodiment, Figure 2 As shown, the shape of the first liquid baffle plate 31 can be set to be conical (i.e., the diameter of the first liquid baffle plate 31 gradually increases from top to bottom), the inner edge is welded to the bottom of the inner body of the falling film area, and a gap is reserved between the outer edge and the inner wall of the cylinder 1, so as to facilitate the return of the separated droplets to the full liquid area and prevent the flow dead zone outside the opening. The liquid baffle plate is full of air guide holes, considering the relationship between the relative opening area and the total area ratio of the annular airway, the liquid level height in the full liquid area and the air flow trajectory, and at the same time ensuring that the opening has a gas equalization effect, the opening diameter is controlled at 10-20mm, preferably 16mm. The angle C between the conical first liquid baffle plate 31 and the axial centerline of the shell is controlled at 40-75°, and the preferred angle is 55°.

[0033] like Figure 3 , 4As shown, the second liquid baffle plate 32 and the third liquid baffle plate 33 are both annular (the annular shape has a small-diameter circular inner edge and a large-diameter circular outer edge), and one third liquid baffle plate 33 and one second liquid baffle plate 32 form a liquid baffle plate group. In this embodiment of the present invention, two liquid baffle plates are specifically provided, and the number of liquid baffle plates can be set according to actual conditions. Two liquid baffle plates form a liquid baffle plate group, which can complement each other. In order to meet the best liquid blocking effect and welding process requirements, the distance between the upper surfaces of the two baffle plates in a liquid baffle plate group is controlled at 30mm-80mm, and the preferred distance is 45mm.

[0034] The second liquid baffle plate 32 is connected to the inner wall of the outer tube, and the second liquid baffle plate 32 surrounds the inner edge of the inner tube 2 and bends downward by a circle of second folded edge; the third liquid baffle plate 33 is connected to the outer wall of the inner tube 2, and the edge of the third liquid baffle plate 33 is bent downward by a circle of third folded edge, and the second liquid baffle plate 32 and the third liquid baffle plate 33 in each group of liquid baffle plates are arranged at intervals, and the second liquid baffle plate 32 is located above the third liquid baffle plate 33. By setting multiple groups of liquid baffle plates, the airway area is turned multiple times, and the folded edge facilitates the droplet to fall.

[0035] To ensure that the separated droplets can flow downward more smoothly, the upper surfaces of the first and second liquid baffles are inclined relative to the inner wall of the cylinder with an inclination angle a, and the specific size of angle a is controlled at 5°-15°, preferably 8°, and the angle between the folded edges of the first and second liquid baffles and the upper surfaces of the first and second liquid baffles is an inclination angle b. This structure utilizes the cross-sectional mutation effect to enhance the liquid blocking effect, and the inclination angle b is controlled at about 70°-85°, and the optimal angle is 81°. The straight edge lengths of the first and second liquid baffles (i.e., the straight line distance between the inner edge and the outer edge) are kept consistent and controlled at 75mm-110mm, and the optimal length is 90mm.

[0036] The airway region is also provided with a filter device 6, specifically a filter, for filtering liquid droplets. The filter device 6 is located above the liquid retaining assembly, that is, between the uppermost liquid retaining plate group and the refrigerant outlet. The filter device is annular to further prevent liquid droplets from flowing out of the refrigerant outlet.

[0037] The present invention also proposes a heat exchanger, specifically a falling film heat exchanger, including the above-mentioned liquid blocking structure. The heat exchanger specifically includes a first heat exchange coil 4 arranged in the inner shell, and a second heat exchange coil 5 arranged in the outer shell and below the inner shell. The inlet and outlet pipes of the first and second heat exchange coils pass through the sides of the shell and the inner shell.

[0038] The present invention also provides an air conditioner, comprising the above-mentioned heat exchanger.

[0039] The above implementation scheme can not only save the space occupied by the heat exchanger and the amount of refrigerant filled, but also reduce the phenomenon of liquid inhalation, enhance the heat exchange performance, and has a compact structure and improves space utilization.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat exchanger, comprising a liquid retaining structure, a first heat exchange coil and a second heat exchange coil; in, The liquid blocking structure comprises: a shell, an inner shell arranged inside the shell for covering the heat exchange coil, characterized in that the gap between the shell and the inner shell forms an airway area surrounding the inner shell, the shell is provided with a refrigerant outlet at the upper part corresponding to the airway area, and the airway area is provided with a liquid blocking component; The shell is a cylinder that is closed at the top and bottom, the inner shell is an inner cylinder that is connected at the top and bottom, the top of the inner cylinder is connected to the top of the cylinder, and a refrigerant inlet is arranged at the top of the shell, and the refrigerant inlet is connected to the area surrounded by the inner cylinder; The area surrounded by the inner cylinder is the falling film area, in which the first heat exchange coil is arranged, and the gaseous refrigerant leaves the falling film area through the central air passage in the middle of the first heat exchange coil. The area below the inner cylinder in the shell is the full liquid area, in which the second heat exchange coil is arranged.

2. The heat exchanger according to claim 1, characterized in that The liquid blocking assembly comprises: a first liquid blocking plate connected between the bottom of the inner cylinder and the inner wall of the cylinder body, and a plurality of air guide holes are arranged on the first liquid blocking plate.

3. The heat exchanger according to claim 1, characterized in that The liquid blocking assembly comprises: a first liquid blocking plate connected between the bottom of the inner cylinder and the inner wall of the cylinder body, the diameter of the first liquid blocking plate gradually increases from top to bottom, and a gap is left between the first liquid blocking plate and the inner wall of the cylinder body.

4. The heat exchanger according to claim 1, characterized in that The liquid blocking assembly comprises: at least one second liquid blocking plate connected to the inner wall of the cylinder, the second liquid blocking plate surrounds the inner edge of the inner cylinder and is bent downward to form a second folded edge.

5. The heat exchanger according to claim 4, characterized in that The liquid blocking assembly further comprises: at least one third liquid blocking plate connected to the outer wall of the inner cylinder, and the edge of the third liquid blocking plate is bent downward to form a third folded edge.

6. The heat exchanger according to claim 5, characterized in that One of the third liquid baffle plates and one of the second liquid baffle plates form a liquid baffle plate group. The second liquid baffle plate and the third liquid baffle plate in each of the liquid baffle plate groups are spaced apart, and the second liquid baffle plate is located above the third liquid baffle plate.

7. The heat exchanger according to claim 5, characterized in that The liquid blocking surfaces of the second liquid blocking plate and the third liquid blocking plate are inclined downward.

8. The heat exchanger according to claim 1, characterized in that A flow equalizing plate is provided inside the inner shell, and the flow equalizing plate is located between the refrigerant inlet and the heat exchange coil.

9. The heat exchanger according to claim 1, characterized in that: The airway area is also provided with a filter device, and the filter device is located above the liquid blocking component.

10. An air conditioner, characterized in that: A heat exchanger comprising any one of claims 1 to 9.

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