Tank type evaporator and air conditioner

Abstract

The present invention provides a tank-type evaporator and an air conditioner, which relates to the technical field of air conditioners and solves the technical problem in the prior art that the evaporated gaseous refrigerant in the falling film area of ​​the tank-type evaporator interferes with the distribution of the liquid refrigerant, resulting in uneven liquid distribution in the heat exchange tubes in the tank-type evaporator. The present invention provides a tank-type evaporator, which provides a gas-liquid separation structure in the falling film area of ​​the tank-type falling film evaporator, so that the gaseous refrigerant can be discharged from the falling film area in time, effectively improving the uniformity and stability of the liquid distribution in the falling film area, thereby effectively improving the heat exchange efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a tank type evaporator and an air conditioner provided with the tank type evaporator. Background Art

[0002] like Figure 1 As shown in the figure, the tank-type falling film evaporator is usually composed of the shell, air guide pipe, first liquid balancing plate, second liquid balancing plate, upper sealing plate, lower sealing plate, disc heat exchange tube and other main parts. Figure 2 The heat exchange process mainly utilizes the first liquid equalizing plate to evenly distribute the refrigerant from the liquid inlet to the heat exchange tube to form a thin film. The refrigerant liquid film fully contacts the surface of the heat exchange tube and evaporates by heat exchange. Sometimes, a second liquid equalizing plate is set to further ensure the uniformity of liquid distribution. The unevaporated refrigerant in the first falling film area drips along the heat exchange tube to the second liquid equalizing plate, further evenly distributes the liquid and drips onto the heat exchange tube in the second falling film area for secondary falling film evaporation. The gaseous refrigerant evaporated and converted from the falling film area is discharged upward through the air guide pipe, and the liquid refrigerant gathers and drips to the bottom of the heat exchanger to form a full liquid area and evaporates fully.

[0003] Because the refrigerant will produce a gas-liquid two-phase mixed refrigerant after evaporation in the falling film area, the evaporated gaseous refrigerant is not discharged in time, which interferes with the distribution and uniform dripping of the liquid refrigerant. Therefore, how to improve the uniformity and stability of the liquid distribution on the tank falling film evaporator has become an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide a tank evaporator and an air conditioner, which solves the technical problem in the prior art that the evaporated gaseous refrigerant in the falling film area of ​​the tank evaporator interferes with the distribution of the liquid refrigerant, resulting in uneven liquid distribution in the heat exchange tubes in the tank evaporator. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A tank-type evaporator provided by the present invention comprises a shell, a falling film zone is formed in the shell, and also comprises a gas-liquid separation structure, the gas-liquid separation structure is located in the falling film zone, and the gaseous refrigerant separated by the gas-liquid separation structure in the falling film zone can be discharged through the exhaust port of the tank-type evaporator.

[0007] Furthermore, the tank-type evaporator includes an air duct and an inner cylinder, the inner cylinder is arranged in the air duct and there is a gap between the outer wall of the inner cylinder and the inner wall of the air duct, the air duct is located in the area of ​​the falling film zone and air duct holes are distributed, the inner cylinder extends into the falling film zone, and the air duct and the inner cylinder cooperate to form the gas-liquid separation structure.

[0008] Furthermore, the inner cylinder is a cylindrical structure with openings at both ends, the axis of the inner cylinder is colinear with the axis of the air guide pipe, and the inner cylinder is connected to the exhaust port.

[0009] Furthermore, a filtering structure for filtering refrigerant droplets is provided at the bottom of the inner cylinder.

[0010] Furthermore, an air hole is provided on the inner cylinder, and the air hole on the inner cylinder and the air hole on the air guide pipe are arranged in a staggered manner, so that the gaseous refrigerant entering between the air guide pipe and the inner cylinder can enter the interior of the inner cylinder through the air hole.

[0011] Furthermore, the inner wall of the inner cylinder is provided with a filtering structure for filtering refrigerant droplets.

[0012] Furthermore, the diameter of the air guide hole is not greater than 5 mm.

[0013] Furthermore, the outer side wall of the inner cylinder and / or the outer side wall of the air guide tube is provided with a groove structure for increasing the surface area.

[0014] Furthermore, the groove structures are vertical grooves and are evenly spaced and distributed along the circumferential direction of the inner tube or the air guide tube.

[0015] Furthermore, the cross section of the groove structure is V-shaped, U-shaped or trapezoidal.

[0016] Furthermore, a liquid distribution area is formed in the shell, and the air guide pipe is located in the liquid distribution area and the air guide holes are distributed on the area.

[0017] The present invention provides an air conditioner, comprising the tank type evaporator.

[0018] The present invention provides a tank evaporator. By arranging a gas-liquid separation structure in a falling film area in the tank falling film evaporator, the gaseous refrigerant can be discharged from the falling film area in time, effectively improving the uniformity and stability of liquid distribution in the falling film area, thereby effectively improving the heat exchange efficiency.

[0019] The preferred technical solution of the present invention can at least produce the following technical effects:

[0020] The outer wall of the inner cylinder and / or the outer wall of the air duct is provided with a groove structure for increasing the surface area. The groove structure increases the surface area of ​​the gas-liquid mixed refrigerant impacting the air duct or the inner cylinder, which is conducive to separating small droplets from the gaseous refrigerant and increasing the gas-liquid separation effect;

[0021] The groove structure is a vertical groove, so that each groove structure can play a role in accelerating the convergence of droplets and guiding them to drip. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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 work.

[0023] Figure 1 It is a cross-sectional schematic diagram of a tank-type falling film evaporator in the prior art;

[0024] Figure 2 It is a cross-sectional schematic diagram of a tank-type falling film evaporator in the prior art (showing the refrigerant flow direction);

[0025] Figure 3 is a schematic cross-sectional view of a tank-type evaporator provided by an embodiment of the present invention;

[0026] Figure 4 yes Figure 3 BB-direction cross-sectional view;

[0027] Figure 5 yes Figure 3 A partial enlarged view of point C in the middle;

[0028] Figure 6 is a schematic structural diagram of an airway provided by an embodiment of the present invention;

[0029] Figure 7 is a schematic structural diagram of an inner cylinder provided by an embodiment of the present invention;

[0030] Figure 8 is another structural schematic diagram of the inner cylinder provided by an embodiment of the present invention;

[0031] Fig. 9 is another structural schematic diagram of the airway provided by an embodiment of the present invention;

[0032] Fig.10 is a schematic top view of an airway provided by an embodiment of the present invention;

[0033] Fig.11 yes Fig.10 A partial enlarged view of point D in the middle.

[0034] In the figure, 1-shell; 2-air guide pipe; 3-falling film area; 4-air guide hole; 5-inner cylinder; 6-filter structure; 7-air hole; 8-groove structure; 9-liquid distribution area; 10-exhaust port; 11-first liquid equalizing plate; 12-second liquid equalizing plate; 13-upper sealing plate; 14-lower sealing plate; 15-heat exchange tube; 16-full liquid area. DETAILED DESCRIPTION

[0035] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0036] See also Figure 1 and Figure 2 , because after the refrigerant evaporates in the falling film area, a gas-liquid two-phase mixed refrigerant will appear, and the evaporated gaseous refrigerant is not discharged in time, which interferes with the distribution and uniform dripping of the liquid refrigerant. The present invention provides a tank evaporator, which aims to solve the above problems. The tank evaporator includes a shell 1, and a falling film area 3 is formed in the shell 1, and also includes a gas-liquid separation structure. The gaseous refrigerant separated by the gas-liquid separation structure in the falling film area 3 can be discharged through the exhaust port 10 of the tank evaporator. The present invention sets a gas-liquid separation structure in the falling film area 3 in the tank falling film evaporator, so that the gaseous refrigerant can be discharged from the falling film area in time, effectively improving the uniformity and stability of the liquid distribution on the falling film area, thereby effectively improving the heat exchange efficiency.

[0037] Regarding the gas-liquid separation structure, the specific structure is as follows: the tank evaporator includes an air duct 2 and an inner tube 5, the inner tube 5 is arranged in the air duct 2 and there is a gap between the outer wall of the inner tube 5 and the inner wall of the air duct 2, the air duct 2 is located in the falling film area 3 and the air duct holes 4 are distributed, the inner tube 5 extends into the falling film area 3, and the air duct 2 and the inner tube 5 cooperate to form a gas-liquid separation structure. The air duct 2 is provided with air duct holes 4, and the refrigerant will produce gas equalization and liquid blocking effects when passing through the air duct 2; the air duct holes 4 can timely discharge the gaseous refrigerant in the falling film area 3, and the gaseous refrigerant at this time also carries liquid phase components, and the gaseous refrigerant further separates gas and liquid by impacting the inner tube 5, and the liquid refrigerant separated on the outer wall of the inner tube 5 gathers and drips downward under the action of gravity, and the separated gaseous refrigerant enters the inner tube 5 and is discharged through the exhaust port 10. The present invention combines the structural characteristics of the tank evaporator, adds an inner cylinder 5 in the air duct 2 and provides an air guide hole 4 on the air duct 2, so as to enable the gaseous refrigerant to be discharged from the falling film area in a timely manner without increasing the volume of the tank evaporator. In addition, the spacing between the outer wall of the inner cylinder 5 and the inner wall of the air duct 2 is limited according to the specific actual situation.

[0038] The method of discharging the separated gas refrigerant is described in detail as follows: the inner cylinder 5 is a cylindrical structure with openings at both ends, and the axis of the inner cylinder 5 is colinear with the axis of the air guide pipe 2, see Figure 8, schematically shows the inner cylinder 5 (at this time, no holes are provided on the circumferential side wall of the inner cylinder 5), the upper end of the inner cylinder 5 is fixed on the upper sealing plate 13, and the lower end extends to the falling film area 3, the refrigerant entering between the air duct 2 and the inner cylinder 5 can enter the inner cylinder 5 through the bottom of the inner cylinder 5, and preferably a filter structure 6 is provided at the bottom of the inner cylinder 5, and the filter structure 6 is used to filter the refrigerant droplets. After the gaseous refrigerant is further separated from the gas and liquid by impacting the inner cylinder 5, the separated refrigerant gas enters the inner cylinder 5 from the bottom of the inner cylinder 5, and flows upward to be discharged from the exhaust port 10, and a filter structure 6 is provided in the inner cylinder 5 to further precisely separate the gas-liquid two-phase refrigerant; and the separated liquid refrigerant drips into the full liquid area 16 by gravity, thereby improving the heat exchange performance and gas-liquid separation efficiency.

[0039] The separated gas refrigerant can also be discharged as follows: the inner cylinder 5 is a cylindrical structure with openings at both ends and a gas hole 7 is provided on the inner cylinder 5, and the axis of the inner cylinder 5 is colinear with the axis of the air guide pipe 2, see Figure 7 , schematically showing an inner tube 5, air holes 7 are distributed on the circumferential side of the inner tube 5, and the air holes 7 on the inner tube 5 are staggered with the air holes 4 on the air guide pipe 2, see Figure 4 , which illustrates the positional relationship between the air guide hole 4 on the air guide pipe 2 and the air hole 7 on the inner tube 5. The gaseous refrigerant entering the air guide hole 4 can hit the area on the inner tube 5 where the air hole 7 is not provided, forming a baffle liquid, which plays a role in gas-liquid separation. The refrigerant entering between the air guide pipe 2 and the inner tube 5 can enter the inner tube 5 through the air hole 7 and the bottom of the inner tube 5. It is preferred to set a filter structure 6 at the bottom of the inner tube 5 and the inner side wall of the inner tube 5, and the filter structure 6 is used to filter the refrigerant droplets. The filter structure 6 further precisely separates the gas-liquid two-phase refrigerant; and the separated liquid refrigerant drips into the full liquid area 16 by gravity, thereby improving the heat exchange performance and gas-liquid separation efficiency.

[0040] Regarding the length of the inner tube 5 , it is preferred that the bottom of the inner tube 5 does not protrude from the bottom of the air duct 2 , and it is more preferred that the bottom of the inner tube 5 is close to the bottom of the air duct 2 .

[0041] As an optional implementation, the diameter of the air guide hole 4 is not greater than 5 mm, and the air guide hole 4 can be a circular or square hole or a waist-shaped hole, etc. The number and size of the air guide holes 4 in the air guide pipe 2 determine the flow area, and it is necessary to ensure that the refrigerant flow rate and the refrigerant flow rate are within the required range of the unit. Similarly, if the inner cylinder 5 is provided with an air hole 7, the diameter of the air hole 7 is not greater than 5 mm, and the air hole 7 can be a circular or square hole or a waist-shaped hole, etc.

[0042] As an optional embodiment, the outer wall of the inner tube 5 and / or the outer wall of the air guide tube 2 is provided with a groove structure 8 for increasing the surface area. Fig. 9, schematically shows an air duct 2 with a groove structure 8, the groove structure 8 on the air duct 2 increases the surface area of ​​the gas-liquid mixed refrigerant impacting the air duct 2, which is conducive to separating small droplets from the gaseous refrigerant and increasing the gas-liquid separation effect. Of course, the groove structure 8 can also be set on the outer surface of the inner tube 5.

[0043] As an optional implementation, the groove structure 8 is a vertical groove, and each groove structure 8 can accelerate the converged droplets to flow and drip, and the groove structures 8 can be evenly spaced and distributed along the circumferential direction of the inner cylinder 5 or the air guide tube 2. The cross section of the groove structure 8 is V-shaped, U-shaped or trapezoidal, and the specific structure of the groove structure 8 is not limited. Fig.11 , schematically illustrates a groove structure 8 with a trapezoidal cross-section. At this time, the air guide holes 4 on the air guide tube 2 can be set at the bottom of the groove structure 8, and each groove structure 8 is provided with an air guide hole 4. In a direction parallel to the axis of the air guide tube 4, a row of spaced air guide holes 4 are provided in the groove structure 8.

[0044] As an optional implementation, air guide holes 4 are distributed in the area of ​​the air guide pipe 2 located in the liquid distribution area 9. The gaseous refrigerant in the liquid distribution area 9 enters between the air guide pipe 2 and the inner tube 5 through the air guide holes 4, and then enters the interior of the inner tube 5 through the bottom of the inner tube 5 (if the inner tube 5 is located in the liquid distribution area 9, no air holes 7 are set), so that a gas-liquid separation structure is also formed in the liquid distribution area 9. Through the gas-liquid separation structure, the refrigerant entering the shell 1 is first separated into gas and liquid, which can greatly reduce the impact of the gaseous refrigerant on the liquid refrigerant, which is conducive to uniform liquid distribution, improves the liquid distribution effect on the surface of the heat exchange tube, and then improves the heat exchange effect.

[0045] An air conditioner includes a tank-type evaporator provided by the present invention. The present invention provides a gas-liquid separation structure in the falling film area 3 in the tank-type falling film evaporator, so that the gaseous refrigerant can be discharged from the falling film area in time, effectively improving the uniformity and stability of the liquid distribution on the falling film area, thereby effectively improving the heat exchange efficiency.

[0046] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A tank evaporator, comprising a shell (1), wherein a falling film zone (3) is formed in the shell (1), characterized in that: It also includes a gas-liquid separation structure, the gas-liquid separation structure is located in the falling film area (3), and the gaseous refrigerant separated by the gas-liquid separation structure in the falling film area (3) can be discharged through the exhaust port (10) of the tank evaporator; The tank-type evaporator comprises an air guide pipe (2) and an inner cylinder (5), the inner cylinder (5) being arranged in the air guide pipe (2) and having a gap between the outer wall of the inner cylinder (5) and the inner wall of the air guide pipe (2), the air guide holes (4) being distributed in the area of ​​the air guide pipe (2) located in the falling film area (3), the inner cylinder (5) extending into the falling film area (3), the air guide pipe (2) and the inner cylinder (5) cooperating to form the gas-liquid separation structure; The inner cylinder (5) is provided with an air hole, and the air hole on the inner cylinder (5) is staggered with the air hole (4) on the air guide pipe (2). The gaseous refrigerant entering between the air guide pipe (2) and the inner cylinder (5) can enter the interior of the inner cylinder (5) through the air hole. The inner cylinder (5) is a cylindrical structure with openings at both ends, and the inner cylinder is connected to the exhaust port.

2. The tank evaporator according to claim 1, characterized in that: The axis of the inner cylinder (5) is colinear with the axis of the air guide tube (2).

3. The tank evaporator according to claim 1, characterized in that: A filtering structure (6) for filtering refrigerant droplets is provided at the bottom of the inner cylinder (5).

4. The tank evaporator according to claim 1, characterized in that: The inner wall of the inner cylinder (5) is provided with a filtering structure (6) for filtering refrigerant droplets.

5. The tank evaporator according to claim 1, characterized in that: The diameter of the air guide hole (4) is no greater than 5 mm.

6. The tank evaporator according to any one of claims 1 to 5, characterized in that: The outer wall of the inner cylinder (5) and / or the outer wall of the air guide tube (2) is provided with a groove structure (8) for increasing the surface area.

7. The tank type evaporator according to claim 6, characterized in that: The groove structures (8) are vertical grooves and the groove structures (8) are evenly spaced and distributed along the circumferential direction of the inner cylinder (5) or the air guide tube (2).

8. The tank type evaporator according to claim 6, characterized in that: The cross section of the groove structure (8) is V-shaped, U-shaped or trapezoidal.

9. The tank type evaporator according to claim 1, characterized in that: A liquid distribution area (9) is formed in the shell (1), and the air guide pipe (2) is located in the area of ​​the liquid distribution area (9) and the air guide holes (4) are distributed.

10. An air conditioner, characterized in that: The invention comprises the tank evaporator according to any one of claims 1 to 9.

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