Evaporator and water chilling unit

Abstract

The utility model discloses an evaporator and a water chilling unit, and relates to the technical field of heat exchange equipment, a heat exchange tube bundle is arranged in a shell of the evaporator, the heat exchange tube bundle comprises a plurality of heat exchange tube sets which are sequentially arranged in the vertical direction, each heat exchange tube set comprises a plurality of heat exchange tube rows, and the heat exchange tube rows are arranged at intervals in the first direction; the first direction is parallel to the horizontal direction and is perpendicular to the axial direction of the shell, each heat exchange tube row comprises a plurality of heat exchange tubes which are arranged at intervals in the vertical direction, and in the same heat exchange tube set, the heat exchange tubes in the same heat exchange tube set are evenly distributed through the distance between every two adjacent heat exchange tube rows located in the middle of the heat exchange tube bundle. The distance between every two adjacent heat exchange tube columns located on the edge of the heat exchange tube bundle is set to be smaller than the distance between every two adjacent heat exchange tube columns located on the edge of the heat exchange tube bundle, so that flowing resistance of the edge of the heat exchange tube bundle is small, the number of airflow rising from the middle of the heat exchange tube bundle to an air suction port can be reduced, the airflow flowing path can be prolonged, and the speed of airflow passing through the heat exchange tube bundle can be reduced. The suction liquid carrying risk of the compressor is reduced.

Description

Technical Field

[0001] This application relates to the field of heat exchange equipment technology, and more particularly to an evaporator and a chiller unit. Background Technology

[0002] Currently, shell-and-tube evaporators are a commonly used type of evaporator in chiller units. A shell-and-tube evaporator consists of a shell, tube bundle, tube sheet, etc. The tube bundle is set inside the shell and installed on the tube sheet. When the shell-and-tube evaporator is working, the refrigerant flows inside the shell, while water or other heat transfer fluid flows inside the tube bundle. The liquid refrigerant vaporizes after being heated on the surface of the tube bundle wall, and the gaseous refrigerant produces bubbles. During the heat exchange process, small bubbles gradually converge and accumulate into large bubbles that rise upwards.

[0003] However, as the bubbles gradually rise, the amount of gas inside them also gradually increases. This causes the bubbles to rise at a faster speed as they pass through the gaps in the tube bundle. When the bubbles reach the liquid surface and burst, the resulting airflow easily carries the surrounding droplets upwards, causing the refrigerant to flow back into the compressor in liquid form, increasing the risk of compressor damage. Utility Model Content

[0004] This application provides an evaporator and a chiller unit that can solve the technical problem that when a shell-and-tube evaporator is working, the liquid refrigerant vaporizes and forms bubbles, and when the bubbles rise to the liquid surface and burst, the resulting airflow easily carries the surrounding liquid droplets back into the compressor.

[0005] In a first aspect, embodiments of this application provide an evaporator, which includes:

[0006] case;

[0007] A heat exchange tube bundle is disposed within the housing. The heat exchange tube bundle includes multiple sets of heat exchange tube groups arranged sequentially in a vertical direction. Each set of heat exchange tube groups includes multiple rows of heat exchange tubes arranged at intervals along a first direction. The first direction is parallel to the horizontal direction and perpendicular to the axial direction of the housing. Each row of heat exchange tubes includes multiple heat exchange tubes arranged at intervals in a vertical direction.

[0008] In the same heat exchange tube bundle, the spacing between two adjacent columns of heat exchange tubes located in the middle portion of the heat exchange tube bundle is smaller than the spacing between two adjacent columns of heat exchange tubes located at the edge portion of the heat exchange tube bundle.

[0009] In some embodiments, the spacing between two adjacent rows of heat exchange tubes in the same group is d, which gradually increases along the first direction from the middle of the heat exchange tube bundle to the edge of the heat exchange tube bundle.

[0010] In some embodiments, in two adjacent heat exchanger tube groups, the spacing between two adjacent columns of heat exchanger tubes in the lower heat exchanger tube group is smaller than the spacing between two adjacent columns of heat exchanger tubes in the upper heat exchanger tube group.

[0011] In some embodiments, in two adjacent heat exchanger tube groups, the tube spacing between two adjacent heat exchanger tubes in the lower heat exchanger tube group is smaller than the tube spacing between two adjacent heat exchanger tubes in the upper heat exchanger tube group.

[0012] In some embodiments, the spacing between two adjacent heat exchange tubes in the heat exchange tube array is h, which gradually increases from bottom to top along the vertical direction.

[0013] In some embodiments, the spacing between two adjacent columns of heat exchange tubes in the same group is d, which gradually increases from bottom to top along the vertical direction.

[0014] In some embodiments, the heat exchange tube assembly includes at least four heat exchange tubes, and four adjacent heat exchange tubes are arranged in a quadrilateral.

[0015] In some embodiments, in two adjacent heat exchanger tube groups, the area of ​​the quadrilateral formed by four adjacent heat exchanger tubes in the upper heat exchanger tube group is greater than the area of ​​the quadrilateral formed by four adjacent heat exchanger tubes in the lower heat exchanger tube group.

[0016] In some embodiments, within the same group of heat exchange tube bundles, the area of ​​the quadrilateral formed by four adjacent heat exchange tubes located in the middle portion of the heat exchange tube bundle is smaller than the area of ​​the quadrilateral formed by four adjacent heat exchange tubes located at the edge portion of the heat exchange tube bundle.

[0017] Secondly, embodiments of this application provide a chiller unit, which includes a compressor, a condenser, and an evaporator as described in any of the preceding claims, wherein the compressor, the condenser, and the evaporator are connected in sequence to form a heat exchange circuit.

[0018] The evaporator and chiller unit based on the embodiments of this application have at least the following beneficial effects:

[0019] By arranging a heat exchange tube bundle within the evaporator shell, the heat exchange tube bundle comprises multiple sets of heat exchange tubes arranged vertically, with each set including multiple rows of heat exchange tubes. These rows are spaced apart along a first direction, parallel to the horizontal direction and perpendicular to the axial direction of the shell. Each row includes multiple heat exchange tubes spaced apart vertically. Within the same set of heat exchange tubes, the spacing between adjacent rows located in the middle portion of the heat exchange tube bundle is set smaller than the spacing between adjacent rows located at the edge portion. When the evaporator operates, refrigerant flows within the shell, while water or other refrigerant flows within the heat exchange tube bundle. The liquid refrigerant vaporizes upon heating on the tube wall surface, and the gaseous refrigerant... The refrigerant will generate bubbles. During the heat exchange process, small bubbles gradually converge and accumulate into large bubbles that rise upwards. Because the spacing between adjacent rows of heat exchange tubes at the edge of the heat exchange tube bundle is relatively large, the flow resistance at the edge of the heat exchange tube bundle is small, which is more conducive to the upward flow of air from the edge of the heat exchange tube bundle. This allows more bubbles to rise from the edge of the heat exchange tube bundle to the compressor suction port, reducing the amount of airflow that rises directly from the middle of the heat exchange tube bundle to the suction port. It also extends the airflow path, thereby reducing the risk of liquid carryover in the compressor suction. Furthermore, the larger spacing at the edge of the heat exchange tube bundle helps to reduce the airflow velocity passing through the heat exchange tube bundle, thereby reducing the ability of the airflow to carry liquid droplets and reducing the risk of liquid carryover in the compressor suction. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the first tube arrangement structure of the heat exchange tube bundle inside the evaporator provided in the embodiments of this application;

[0022] Figure 2 This is a schematic diagram of a second tube arrangement structure for the heat exchange tube bundle inside the evaporator provided in the embodiments of this application;

[0023] Figure 3 This is a schematic diagram of the structure in which four adjacent heat exchange tubes form a quadrilateral in the heat exchange tube group provided in the embodiments of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100. Evaporator; 10. Heat exchanger tube bundle; 1. Heat exchanger tube group; 11. Heat exchanger tube row; 111. Heat exchanger tube; 1111. First tube; 1112. Second tube; 1113. Third tube; 1114. Fourth tube; 20. Shell. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] To address the technical problem that when the evaporator 100 is working, the liquid refrigerant vaporizes and forms bubbles, and when these bubbles rise to the liquid surface and burst, the resulting airflow easily carries surrounding liquid droplets back into the compressor.

[0028] Please see Figure 1 and Figure 2 This application provides an embodiment of an evaporator 100, which includes a shell 20 and a heat exchange tube bundle 10. The heat exchange tube bundle 10 is disposed inside the shell 20. When the evaporator 100 is working, refrigerant flows inside the shell 20, while water or other refrigerant flows inside the heat exchange tube bundle 10. The liquid refrigerant vaporizes after being heated on the surface of the tube wall of the heat exchange tube bundle 10, and the gaseous refrigerant generates bubbles. During the heat exchange process, small bubbles gradually converge and accumulate into large bubbles that rise upwards.

[0029] Specifically, the heat exchange tube bundle 10 can include multiple sets of heat exchange tube groups 1 arranged vertically in sequence, with adjacent sets of heat exchange tube groups 1 spaced apart, and each set of heat exchange tube groups 1 includes multiple rows of heat exchange tube columns 11. The multiple rows of heat exchange tube columns 11 are spaced apart along a first direction, which is parallel to the horizontal plane and perpendicular to the axial direction of the shell 20. Each row of heat exchange tube columns 11 includes multiple heat exchange tubes 111 spaced apart vertically. In the same set of heat exchange tube groups 1, the distance between two adjacent rows of heat exchange tubes 111 located in the middle part of the heat exchange tube bundle 10 is smaller than the distance between two adjacent rows of heat exchange tube columns 11 located at the edge part of the heat exchange tube bundle 10.

[0030] In this embodiment, vertical refers to the up-down direction, and the first direction refers to the left-right direction. Figure 1 In the diagram, the positive Y-axis is upward, the negative Y-axis is downward, the positive X-axis is to the right, and the negative X-axis is to the left.

[0031] It is understood that the shell 20 has a cylindrical structure and a circular cross-section. The straight line extending vertically and intersecting the axis of the shell 20 is the center line of the cross-section of the shell 20. This center line divides the cross-section of the shell 20 into left and right parts. The part of the heat exchange tube bundle 10 close to the center line is the middle part of the heat exchange tube bundle 10, and the part of the heat exchange tube bundle 10 away from the center line is the edge part of the heat exchange tube bundle 10. More specifically, the part of the heat exchange tube bundle 10 located to the left of the center line and away from the center line is the left part of the heat exchange tube bundle 10, and the part of the heat exchange tube bundle 10 located to the right of the center line and away from the center line is the right part of the heat exchange tube bundle 10.

[0032] For ease of description, the distance between two adjacent columns of heat exchange tubes 11 on the left side of the heat exchange tube bundle 10 is defined as the left distance, the distance between two adjacent columns of heat exchange tubes 11 in the middle part of the heat exchange tube bundle 10 is defined as the middle distance, and the distance between two adjacent columns of heat exchange tubes 11 in the right side of the heat exchange tube bundle 10 is defined as the right distance. The middle distance is smaller than the left distance and the right distance, so that the flow resistance on the left and right sides of the heat exchange tube bundle 10 is smaller than the flow resistance in the middle part of the heat exchange tube bundle 10.

[0033] When the evaporator 100 is working, refrigerant flows inside the shell 20, while water or other refrigerant flows inside the heat exchange tube bundle 10. The liquid refrigerant vaporizes after being heated on the surface of the heat exchange tube 111, and the gaseous refrigerant generates bubbles. During the heat exchange process, small bubbles gradually converge and accumulate into large bubbles that rise upwards. Since the flow resistance on the left and right sides of the heat exchange tube bundle 10 is less than the flow resistance in the middle part of the heat exchange tube bundle 10, the left and right sides of the heat exchange tube bundle 10 are more conducive to guiding the airflow upwards, so that more bubbles will rise from the left and right sides of the heat exchange tube bundle 10 to the compressor suction port. This reduces the amount of airflow that rises directly from the middle part of the heat exchange tube bundle 10 to the suction port. Furthermore, the curved walls on the left and right sides of the shell 20 can extend the airflow path, thereby reducing the risk of liquid carryover in the compressor suction. In addition, the larger spacing between the two adjacent rows of heat exchange tubes 11 on the left and right sides of the heat exchange tube bundle 10 helps to reduce the airflow velocity passing through the heat exchange tube bundle 10, thereby reducing the ability of the airflow to carry liquid droplets and reducing the risk of liquid carryover in the compressor suction.

[0034] To ensure that the airflow within the casing 20 passes through the left and right sides of the heat exchange tube bundle 10, please refer to [link / reference needed]. Figure 1 and Figure 2 In some embodiments, in the same heat exchange tube bundle 1, the distance between two adjacent heat exchange tube bundles 11 is d, and d gradually increases from the middle of the heat exchange tube bundle 10 to the edge of the heat exchange tube bundle 10 along a first direction.

[0035] Combination Figure 1As shown, in this embodiment, multiple heat exchange tubes 111 in the heat exchange tube array 11 are arranged sequentially at intervals in the vertical direction, and the tube diameters of the multiple heat exchange tubes 111 are the same. This allows a straight line to be set that is tangent to all the heat exchange tubes 111 in the same column. For ease of description, two adjacent columns of heat exchange tube array 11 are defined as the first column of heat exchange tube array 11 and the second column of heat exchange tube array 11, respectively. The first column of heat exchange tube array 11 can be provided with a first tangent line on the side near the second column of heat exchange tube array 11. The first tangent line is tangent to all the heat exchange tubes 111 in the first column of heat exchange tube array 11. The second column of heat exchange tube array 11 can be provided with a second tangent line on the side near the first column of heat exchange tube array 11. The second tangent line is tangent to all the heat exchange tubes 111 in the second column of heat exchange tube array 11. The distance between the first tangent line and the second tangent line is d.

[0036] It should be noted that when multiple heat exchange tubes 111 in a column of heat exchange tubes 11 are not arranged at intervals in a vertical direction, and it is impossible to set a straight line tangent to all multiple heat exchange tubes 111 in the same column, any heat exchange tube 111 in the first column of heat exchange tubes 11 can be defined as the first heat exchange tube 111, and the heat exchange tube 111 in the second column of heat exchange tubes 11 that is closest to the first heat exchange tube 111 can be defined as the second heat exchange tube 111. The side of the first heat exchange tube 111 closest to the second heat exchange tube 111 has a first tangent line, and the side of the second heat exchange tube 111 closest to the first heat exchange tube 111 has a second tangent line, and the first tangent line and the second tangent line are parallel, and the distance between the first tangent line and the second tangent line is d.

[0037] In a set of heat exchange tube bundles 1, the heat exchange tube column 11 closest to the center line of the shell 20 is defined as the central heat exchange tube column, or the heat exchange tube column 11 located on the center line of the shell 20 is defined as the central heat exchange tube column. The distance d between the central heat exchange tube column and its adjacent heat exchange tube columns 11 is the minimum distance in the set of heat exchange tube bundles 1. Along the first direction, the distance d between two adjacent heat exchange tube columns 11 gradually increases from the central heat exchange tube column to the direction away from the central heat exchange tube column, so that the distance d at the edge of the heat exchange tube bundle 10 is the largest. When the airflow flows through the heat exchange tube bundle 10 from bottom to top, the airflow rate through the heat exchange tube bundle 10 gradually decreases along the direction close to the central heat exchange tube column, and the airflow rate through the middle part of the heat exchange tube bundle 10 is the smallest. This allows most of the airflow to flow through the left and right sides of the heat exchange tube bundle 10, which can further reduce the ability of the airflow to carry liquid droplets and reduce the risk of liquid carry-in when the compressor draws in the air.

[0038] Please see Figure 1 and Figure 2 In some embodiments, in two adjacent heat exchanger tube groups 1, the spacing between two adjacent columns of heat exchanger tubes 11 in the lower heat exchanger tube group 1 is smaller than the spacing between two adjacent columns of heat exchanger tubes 11 in the upper heat exchanger tube group 1.

[0039] For example, the heat exchange tube bundle 10 includes at least two sets of heat exchange tube groups 1, and the two sets of heat exchange tube groups 1 are arranged vertically at intervals. The distance between two adjacent columns of heat exchange tube groups 11 in the upper heat exchange tube group 1 is d1, and the distance between two adjacent columns of heat exchange tube groups 11 in the lower heat exchange tube group 1 is d2. d2 and d1 satisfy: d2 > d1.

[0040] When the evaporator 100 is working, the liquid refrigerant vaporizes after being heated on the surface of the heat exchange tube 111, and the gaseous refrigerant generates bubbles. During the heat exchange process, small bubbles gradually converge and accumulate into large bubbles that rise upwards. After the bubbles gather, they form an upward-flowing airflow. Since the spacing d2 of the upper heat exchange tube group 1 is greater than the spacing d1 of the lower heat exchange tube group 1, the upper heat exchange tube group 1 can provide sufficient space for the gas to rise, thereby slowing down the flow velocity of the airflow between the heat exchange tube bundles 10. As a result, when the airflow reaches the liquid surface, the gas's ability to carry liquid droplets is reduced due to the lower airflow velocity, thereby further reducing the risk of liquid carryover during suction.

[0041] It should be further explained that the heat exchange tube bundle 10 may include multiple sets of heat exchange tube groups 1, which are arranged vertically at intervals. From bottom to top, the distance between two adjacent rows of heat exchange tube groups 11 in the upper heat exchange tube group 1 is greater than the distance between two adjacent rows of heat exchange tube groups 11 in the lower heat exchange tube group 1. This makes the space for the airflow to pass through increasingly larger as the airflow flows from bottom to top, which can slow down the upward flow velocity of the airflow. In this embodiment, the number of heat exchange tube groups 1 is not limited, and the number of heat exchange tube groups 1 can be set according to the actual situation.

[0042] To ensure smoother airflow through the heat exchanger tube bundle 10, please refer to [link / reference needed]. Figure 1 and Figure 2 In some embodiments, in two adjacent heat exchanger tube groups 1, the tube spacing between two adjacent heat exchanger tubes 111 in the lower heat exchanger tube group 11 is smaller than the tube spacing between two adjacent heat exchanger tubes 111 in the upper heat exchanger tube group 11.

[0043] Optionally, each row of heat exchange tubes 11 includes multiple heat exchange tubes 111 arranged at vertical intervals, combined with Figure 3 The tube spacing between two adjacent heat exchange tubes 111 in the heat exchange tube array 11 is h. For ease of description, in two adjacent heat exchange tube groups 1, the tube spacing between two adjacent heat exchange tubes 111 in the upper heat exchange tube array 11 can be defined as h1, and the tube spacing between two adjacent heat exchange tubes 111 in the lower heat exchange tube array 11 can be defined as h2. h1 and h2 satisfy: h1 > h2.

[0044] When the evaporator 100 is working, the bubbles in the shell 20 flow from bottom to top, and the bubbles will accumulate more and more as they flow upward. Since h1 > h2, there is more space in the upper heat exchange tube bundle 11 for the bubbles to flow in the left and right directions, so that the bubbles can be more dispersed in the left and right directions, preventing the bubbles from accumulating in one place and causing blockage, and allowing the airflow formed by the bubbles to flow more smoothly through the heat exchange tube bundle 10.

[0045] In addition, the bubbles can be more dispersed in the left and right directions, which can also prevent the airflow velocity from being too high due to excessive concentration of bubbles. This can further reduce the gas's ability to carry liquid droplets, thereby further reducing the risk of liquid being carried by the gas.

[0046] Please see Figure 3 In some embodiments, in the heat exchange tube array 11, the tube spacing between two adjacent heat exchange tubes 111 is h, and h gradually increases from bottom to top vertically.

[0047] Specifically, the heat exchange tube array 11 may include at least three heat exchange tubes 111. The tube spacing between the middle heat exchange tube 111 and the lower heat exchange tube 111 is smaller than the tube spacing between the middle heat exchange tube 111 and the upper heat exchange tube 111. This allows for more space between the two adjacent upper heat exchange tubes 111 as the bubbles grow larger during upward flow, preventing bubbles from clogging between adjacent heat exchange tube arrays 111 and enabling bubbles to pass through the heat exchange tube bundle 10 more smoothly.

[0048] Please see Figure 1 and Figure 2 In some embodiments, in the same heat exchange tube group 1, the distance between two adjacent heat exchange tube groups 11 is d, and d gradually increases from bottom to top vertically.

[0049] It is understandable that when the evaporator 100 is working, the generated bubbles will flow upward and pass through the gap between the two adjacent heat exchange tube rows 11. As the bubbles flow upward, they will become larger and larger. If the gap between the two adjacent heat exchange tube rows 11 remains unchanged, there will be insufficient space for the bubbles to rise.

[0050] In this embodiment, the distance d between two adjacent heat exchange tube columns 11 is gradually increased vertically from bottom to top. As the bubbles flow upward, the channel formed between the two adjacent heat exchange tube columns 11 also gradually widens, providing sufficient space for the bubbles to rise. This slows down the flow rate of the bubbles between the two adjacent heat exchange tube columns 11, further reducing the risk of liquid carryover during air intake.

[0051] Please see Figure 3In some embodiments, the heat exchange tube group 1 includes at least four heat exchange tubes 111, and the four adjacent heat exchange tubes 111 are arranged in a quadrilateral.

[0052] Optionally, each of two adjacent heat exchange tube rows 11 includes at least four heat exchange tubes 111, and each heat exchange tube row 11 includes at least two heat exchange tubes 111, so that the four adjacent heat exchange tubes 111 can be arranged in a quadrilateral shape, which can facilitate the reasonable arrangement of numerous heat exchange tubes 111 within the shell 20, and can make full use of the space of the shell 20 to arrange more heat exchange tubes 111, thereby increasing the heat exchange capacity of the evaporator 100.

[0053] In this embodiment, the four adjacent heat exchange tubes 111 arranged in a quadrilateral shape are respectively the first tube 1111, the second tube 1112, the third tube 1113, and the fourth tube 1114. The first tube 1111 and the third tube 1113 belong to the same column of heat exchange tubes 11, the second tube 1112 and the fourth tube 1114 belong to the same column of heat exchange tubes 11, and the axis of the first tube 1111 is located below the axis of the second tube 1112, the axis of the second tube 1112 is located below the axis of the third tube 1113, and the axis of the third tube 1113 is located below the axis of the fourth tube 1114. This arrangement allows the heat exchange tubes 111 that are not in the same column of the adjacent columns of heat exchange tubes 11 to be staggered vertically, which can increase the gap between the adjacent columns of heat exchange tubes 11 and allow bubbles to flow more smoothly through the heat exchange tubes 11.

[0054] Please see Figures 1 to 3 In some embodiments, in two adjacent heat exchanger tube groups 1, the area of ​​the quadrilateral formed by four adjacent heat exchanger tubes 111 in the upper heat exchanger tube group 1 is greater than the area of ​​the quadrilateral formed by four adjacent heat exchanger tubes 111 in the lower heat exchanger tube group 1.

[0055] Understandably, the centerlines of four adjacent heat exchange tubes 111 in the upper heat exchange tube group 1 can intersect a plane, forming four points on that plane. The line connecting these four points can form a first quadrilateral. Similarly, the centerlines of four adjacent heat exchange tubes 111 in the lower heat exchange tube group 1 can intersect the same plane, forming four points on that plane. The line connecting these four points can form a second quadrilateral. The area of ​​the first quadrilateral is larger than the area of ​​the second quadrilateral. With the same tube diameter, the space for bubbles to pass through formed by the four adjacent heat exchange tubes 111 in the upper heat exchange tube group 1 is larger than the space for bubbles to pass through formed by the four adjacent heat exchange tubes 111 in the lower heat exchange tube group 1. This allows the upper heat exchange tube group 1 to provide more space for the lower bubbles to pass through, reducing the bubble velocity and further reducing the risk of liquid carryover during gas intake.

[0056] Please see Figures 1 to 3In some embodiments, within the same heat exchange tube group 1, the area of ​​the quadrilateral formed by four adjacent heat exchange tubes 111 located in the middle part of the heat exchange tube bundle 10 is smaller than the area of ​​the quadrilateral formed by four adjacent heat exchange tubes 111 located at the edge part of the heat exchange tube bundle 10.

[0057] Within the same heat exchange tube bundle 1, for ease of description, the quadrilateral formed by four adjacent heat exchange tubes 111 in the middle part of the heat exchange tube bundle 10 is defined as the middle quadrilateral, the quadrilateral formed by four adjacent heat exchange tubes 111 in the left part of the heat exchange tube bundle 10 is defined as the left quadrilateral, and the quadrilateral formed by four adjacent heat exchange tubes 111 in the right part of the heat exchange tube bundle 10 is defined as the right quadrilateral. The area of ​​the middle quadrilateral is smaller than the areas of the left quadrilateral and the right quadrilateral, so that a larger space can be formed on the left and right edges of the heat exchange tube bundle 10 for bubbles to pass through. This reduces the amount of airflow that rises directly from the middle part of the heat exchange tube bundle 10 to the suction port, and reduces the risk of liquid carryover in the compressor suction.

[0058] Secondly, this application also provides a water chiller unit, which includes a compressor, a condenser and an evaporator 100 as described above. The compressor, condenser and evaporator 100 are connected in sequence to form a heat exchange circuit.

[0059] The beneficial effects of the chiller unit in this application are the same as those of the evaporator 100 in this application, and will not be repeated here.

[0060] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0061] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An evaporator, characterized in that, include: case; A heat exchange tube bundle is disposed within the housing. The heat exchange tube bundle includes multiple sets of heat exchange tube groups arranged sequentially in a vertical direction. Each set of heat exchange tube groups includes multiple rows of heat exchange tubes arranged at intervals along a first direction. The first direction is parallel to the horizontal direction and perpendicular to the axial direction of the housing. Each row of heat exchange tubes includes multiple heat exchange tubes arranged at intervals in a vertical direction. In the same heat exchange tube bundle, the spacing between two adjacent columns of heat exchange tubes located in the middle portion of the heat exchange tube bundle is smaller than the spacing between two adjacent columns of heat exchange tubes located at the edge portion of the heat exchange tube bundle.

2. The evaporator according to claim 1, characterized in that, In the same group of heat exchange tube bundles, the distance between two adjacent columns of heat exchange tube bundles is d, and d gradually increases from the middle of the heat exchange tube bundle to the edge of the heat exchange tube bundle along the first direction.

3. The evaporator according to claim 1, characterized in that, In two adjacent heat exchanger tube groups, the spacing between two adjacent columns of heat exchanger tubes in the lower heat exchanger tube group is smaller than the spacing between two adjacent columns of heat exchanger tubes in the upper heat exchanger tube group.

4. The evaporator according to claim 1, characterized in that, In two adjacent heat exchanger tube groups, the tube spacing between two adjacent heat exchanger tubes in the lower heat exchanger tube group is smaller than the tube spacing between two adjacent heat exchanger tubes in the upper heat exchanger tube group.

5. The evaporator according to any one of claims 1-4, characterized in that, In the heat exchange tube array, the tube spacing between two adjacent heat exchange tubes is h, which gradually increases from bottom to top along the vertical direction.

6. The evaporator according to any one of claims 1-4, characterized in that, In the same group of heat exchange tubes, the distance between two adjacent columns of heat exchange tubes is d, and d gradually increases from bottom to top along the vertical direction.

7. The evaporator according to claim 1, characterized in that, The heat exchange tube assembly includes at least four heat exchange tubes, and four adjacent heat exchange tubes are arranged in a quadrilateral shape.

8. The evaporator according to claim 7, characterized in that, In two adjacent heat exchange tube groups, the area of ​​the quadrilateral formed by four adjacent heat exchange tubes in the upper heat exchange tube group is greater than the area of ​​the quadrilateral formed by four adjacent heat exchange tubes in the lower heat exchange tube group.

9. The evaporator according to claim 7, characterized in that, Within the same heat exchange tube bundle, the area of ​​the quadrilateral formed by four adjacent heat exchange tubes in the middle portion of the heat exchange tube bundle is smaller than the area of ​​the quadrilateral formed by four adjacent heat exchange tubes in the edge portion of the heat exchange tube bundle.

10. A water chiller unit, characterized in that, It includes a compressor, a condenser, and an evaporator as described in any one of claims 1 to 9, wherein the compressor, the condenser, and the evaporator are connected in sequence to form a heat exchange circuit.

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