Container water cover for evaporator cylinder, evaporator and unit

Abstract

The utility model discloses a container water cover for an evaporator cylinder, an evaporator and a unit, which comprises a flat cover-shaped shell, a water inlet pipe, a water outlet pipe, a water outlet pipe, a water outlet pipe and a water outlet pipe, wherein the projection shape of the shell along the axial direction of the evaporator cylinder is matched with that of a cylinder end cover; the flat cover plate extends outwards to form a pipe body so as to be communicated with a water source inlet and outlet end; in the radial outer edge area of the water connecting pipe, the flat cover is hollowed outwards relative to the flat cover in the axial direction of the cylinder body to form an inwards-concave cavity extending inwards in the axial direction from the inner end face of the flat cover, and the inwards-concave depth is smaller than the thickness of the flat cover; the axial projection area of the special-shaped water chamber and the water connecting pipe at least covers the pipe distribution area and the communicating area of the water connecting pipe and the shell. The length of the unit is effectively reduced, water pressure drop is optimized, heat exchange of the evaporator is enhanced, and investment of heat exchange pipes and water pumps is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of falling film evaporators, and in particular to a falling film evaporator water cover suitable for a series countercurrent unit, which can be applied to heating, ventilation, air conditioning, refrigeration, chemical industry, environmental protection and other fields. Background Art

[0002] The refrigeration system is mainly composed of a compressor, an evaporator, a condenser and a throttling device. With the increasing demand for energy conservation and environmental protection, the research on chillers has shifted to high performance and low energy consumption. In conventional air-conditioning systems, the energy consumption of chillers and water pumps accounts for about 74%, and the series countercurrent arrangement of multiple chillers has a significant energy-saving effect and is increasingly used in large units.

[0003] Falling film evaporators are also widely used in the field of refrigeration and air-conditioning technology because of their advantages such as small refrigerant charge, compact structure, high heat transfer efficiency and stable heat exchange.

[0004] At the same time, the water side pressure drop of the condenser and falling film evaporator is also an important performance indicator. The lower the water side pressure drop of the container, the lower the energy consumption of the water pump. At the same time, the thickness of the evaporator water cover and the water side pressure bearing capacity are also important influencing factors that determine the length and weight of the unit, and the requirements for the weight and installation space of the unit are relatively high.

[0005] Due to the limitation of water side pressure drop and the increasing requirements for unit energy efficiency, units often adopt a series countercurrent configuration. Series countercurrent means connecting two chillers in series, with special requirements for the flow direction of chilled water and cooling water: chilled water first passes through the upstream chiller evaporator and then through the downstream chiller evaporator; while cooling water flows in the opposite direction, preferentially passing through the downstream chiller condenser and then through the upstream chiller condenser. Compared with the conventional chiller layout, this situation can share a chilled water pump and cooling water pump, saving energy, simplifying the piping layout, and saving floor space.

[0006] Figure 1 The falling film evaporator is shown in series in a countercurrent system. For a series countercurrent refrigeration system, the mainstream container water cover 1 at this stage adopts an elliptical head water cover that bulges outward along the extension direction of the horizontal cylinder 2.

[0007] like Figure 1 As shown in the figure, the elliptical head convex water cover has the advantages of good pressure bearing capacity and easy processing. However, the length of the evaporator connected in series with the elliptical head water cover is generally too long. For example, the length of two four-meter-long units connected in series often exceeds 8 meters. This existing evaporator water cover structure brings great challenges to transportation and installation. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide a container water cover for an evaporator cylinder, an evaporator and a unit, which effectively reduce the length of the unit, while taking into account the optimization of water pressure drop, enhancing the heat exchange of the evaporator, and reducing the investment in heat exchange tubes and water pumps.

[0009] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0010] A container water cover for an evaporator cylinder, characterized by comprising:

[0011] The outer shell is in the shape of a flat cover and its projection shape along the axial direction of the evaporator cylinder matches the cylinder end cover, and a connecting portion connected to the cylinder end cover is arranged at the edge;

[0012] The water pipe extends outward from the flat cover plate to form a pipe body to connect the water inlet and outlet;

[0013] The special-shaped water chamber is hollowed out from the flat cover relative to the flat cover along the axial direction of the cylinder body in the radial outer edge area of ​​the water pipe to form an inner concave chamber extending axially inward from the inner end surface of the flat cover, and the depth of the concave chamber is less than the thickness of the flat cover;

[0014] The axial projection area of ​​the special-shaped water chamber and the water connecting pipe at least covers the pipe laying area and the area where the water connecting pipe is connected with the shell.

[0015] In the above technical solution, the axial projection area of ​​the special-shaped water chamber at least covers the upper concentrated pipe layout area and the lower concentrated pipe layout area.

[0016] In the above technical solution, the center of the water connecting pipe is located below the center of the end cover or shell of the evaporator cylinder.

[0017] In the above technical solution, the axial projection of the special-shaped water chamber presents an irregular arc structure that is narrow at the top and wide at the bottom, and the wider area at the bottom has a circular edge.

[0018] In the above technical solution, the axial projection of the special-shaped water chamber presents an axisymmetric structure relative to the vertical center line of the end cover of the evaporator cylinder.

[0019] In the above technical solution, the flat cover area of ​​the shell has a contour consistent with the water chamber or a circle consistent with the end cover of the cylinder.

[0020] In the above technical solution, the thickness of the flat cover is a thin plate which is much smaller than the thickness of the outwardly protruding elliptical water cover.

[0021] In the above technical solution, the thickness of the flat cover is 1 / 6 to 1 / 4 of the thickness of the outward protruding elliptical water cover.

[0022] An evaporator is characterized by using the above-mentioned container water cover for the evaporator cylinder.

[0023] A series countercurrent unit is characterized by being formed by connecting the above evaporators in series.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] 1. The water cover is processed into a special-shaped water chamber with a flat cover, which has high strength and low water pressure drop, and is particularly suitable for large cooling capacity series units. The appropriate water cover head design can effectively reduce the length of the unit, while taking into account the optimization of water pressure drop, enhancing the heat exchange of the evaporator, and reducing the investment in heat exchange tubes and water pumps.

[0026] 2. Easy processing and installation. Water cover welding and bolt connection can be realized, which can greatly shorten the length of the series unit.

[0027] 3. When the center of the water pipe is set lower, the water chamber and pipe layout are considered comprehensively, especially when applied to falling film evaporators. Compared with ordinary water covers, the water pressure drop can be reduced by 70%. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a series connection form of a falling film evaporator in the prior art applied to a series countercurrent system.

[0030] Figure 2 This is a structural diagram of a container water cover implemented by the utility model.

[0031] Figure 3 for Figure 2 Schematic diagram from another perspective.

[0032] Figure 4 The relative positions of the container water cover 200 and the container pipe 3 of the utility model are shown.

[0033] Figure 5 The falling film evaporator formed by the container water cover 200 of the utility model is shown to be applied in a series connection form in a series countercurrent system (with Figure 1 In contrast, the same cylinder length is adopted, and the water cover adopts the water cover of the utility model).

[0034] Figure 6 This is a schematic structural diagram of a container water cover according to the second embodiment of the utility model.

[0035] Figure 7 and Figure 8 Schematic diagram of the structure of the container water cover from different angles of view according to the third embodiment of the utility model.

[0036] Fig. 9 1 is an axial projection diagram of water chambers of different shapes according to the present invention (ad are the shapes of one embodiment). DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0045] Example 1

[0046] As attached Figure 2 and 3 According to the implementation of the utility model, a container water cover 200 is composed of an outer shell 21; a special-shaped water chamber 22; an edge connection part 23 connected to the evaporator tube plate, and a water pipe 24; the outer shell 21 is a flat cover with a thin thickness, which is much smaller than the thickness of an ordinary elliptical water cover, generally 1 / 6 to 1 / 4 of the thickness of an ordinary elliptical water cover; in particular, the special-shaped water chamber 22 protrudes outward axially relative to the inner end face of the flat cover according to the container heat exchange tube arrangement area to form an inner concave chamber lower than the inner end face of the flat cover, and the axial projection area of ​​the special-shaped water chamber 22 covers at least the upper concentrated pipe arrangement area and the lower concentrated pipe arrangement area and the connecting area of ​​the water pipe 24, especially the irregular arc designed according to the falling film evaporator, which is narrow at the top and wide at the bottom, taking into account the arrangement of the water pipe 24 and the heat exchange tube arrangement, and adopts an arc design at the sharp corner, which has a good pressure-bearing effect, less water storage, small water pressure drop loss, convenient processing, and lower water pump energy consumption.

[0047] Figure 4 The relative position of the water cover 200 and the container pipe 3 of the utility model is shown. Among them, the axial projection area of ​​the special-shaped water chamber 22 covers the upper concentrated pipe area and the lower concentrated pipe area (the heat exchange pipes 3 are evenly distributed in each pipe area) and the connecting area of ​​the water pipe 24. It is narrow at the top and wide at the bottom, taking into account the layout of the water pipe 24 and the layout of the heat exchange pipe.

[0048] The special-shaped water chamber 22 can be directly processed into Figure 2 and 3 The special-shaped water cover is then connected to the container tube plates at both ends of the evaporator cylinder by welding or bolting at the edge connection part 23 of the shell 21.

[0049] Figure 5 It shows that the falling film evaporator formed by the container water cover 200 of the present invention is applied in series in a series countercurrent system.

[0050] The container water cover 1 is an elliptical head water cover that bulges outward along the extending direction of the horizontal cylinder 2. Figure 5 As shown, the water cover of the utility model is shown in 200, and Figure 1 By comparison, it can be seen that for the same evaporator and water pipe design, the special-shaped flat cover design disclosed in this case has a thickness of only 1 / 6 to 1 / 4 of the elliptical water cover. When the installation site is limited, the reduction in the thickness of the four water covers can greatly reduce the length of the unit, making on-site installation more feasible.

[0051] Embodiment 2:

[0052] Different from the first embodiment, the processing of the special-shaped water chamber 22 can be carried out as follows: Figure 6 A circular water cover is provided, and an internal special-shaped space recessed in the end face of the shell is cut out on the water cover shell 21 along the axial direction of the cylinder, and then the edge connection part of the shell 21 is connected to the container tube plates at both ends of the evaporator cylinder by welding or bolting at 23.

[0053] Example 3

[0054] Attached Figure 7 and Figure 8 , showing the internal water chamber space of the container water cover from different angles. The water chamber space is mainly suitable for falling film evaporator. At the same time, the water connecting pipe 24 can be offset to the lower center of the cylinder, so that the space of the water chamber takes into account the pipe layout of the falling film area and the full liquid area. When the unit is supplied with water, the pressure drop is only 30% of the original elliptical head, which greatly reduces the energy consumption of the water pump.

[0055] Figure 7 and 8 In the structure, the flat cover of the water cover shell 21 is equivalent to digging out a water chamber 22 that is nearly semicircular or slightly smaller than a semicircle, and the area of ​​the water chamber 22 mainly corresponds to the pipe layout area of ​​the flooded evaporator.

[0056] The projection of the water chamber 22 is generally an irregular arc structure with an upper portion extending horizontally and a lower portion axially symmetrically connecting the two ends of the upper portion upward.

[0057] The axial projection of the special-shaped water chamber 22 is typically narrower at the top and wider at the bottom, and the lower part of the space is generally a wider area with an axisymmetric arc or circular edge.

[0058] Optionally, the axial projection of the special-shaped water chamber may be a semicircle or a small semicircle with an area smaller than a semicircle according to the pipe layout. A semicircle with an area larger than a semicircle is also acceptable. The feasible projection area is shown as follows: Fig. 9 Any or similar variations of .

[0059] Example 4

[0060] The utility model provides various evaporators adopting the above-mentioned water cover, especially falling film evaporators, which are particularly suitable for occasions where evaporators are used in series.

[0061] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Claims

1. A container water cover for an evaporator cylinder, characterized in that include: The outer shell is in the shape of a flat cover and its projection shape along the axial direction of the evaporator cylinder matches the cylinder end cover, and a connecting portion connected to the cylinder end cover is arranged at the edge; The water pipe extends outward from the flat cover plate to form a pipe body to connect the water inlet and outlet; The special-shaped water chamber is hollowed out from the flat cover relative to the flat cover along the axial direction of the cylinder body in the radial outer edge area of ​​the water pipe to form an inner concave chamber extending axially inward from the inner end surface of the flat cover, and the depth of the concave chamber is less than the thickness of the flat cover; The axial projection area of ​​the special-shaped water chamber and the water connecting pipe at least covers the pipe laying area and the area where the water connecting pipe is connected with the shell.

2. The container water cover for the evaporator cylinder according to claim 1, characterized in that The axial projection area of ​​the special-shaped water chamber at least covers the upper concentrated pipe layout area and the lower concentrated pipe layout area.

3. The container water cover for the evaporator cylinder according to claim 1, characterized in that The center of the water connection pipe is located at the lower part of the center of the evaporator cylinder end cover or the shell.

4. The container water cover for the evaporator cylinder according to claim 1, characterized in that The axial projection of the special-shaped water chamber presents an irregular arc-shaped closed structure with the upper part extending horizontally and the lower part axially symmetrically connecting the two ends of the upper horizontal part upward.

5. The container water cover for the evaporator cylinder according to claim 1, characterized in that The axial projection of the special-shaped water chamber presents an axisymmetric structure relative to the vertical center line of the end cover of the evaporator cylinder.

6. The container water cover for the evaporator cylinder according to claim 1, characterized in that The flat cover area of ​​the shell is a contour consistent with the water chamber or a circle consistent with the end cover of the cylinder.

7. The container water cover for the evaporator cylinder according to claim 1, characterized in that The thickness of the flat cover is a thin plate which is much smaller than the thickness of the outward protruding elliptical water cover.

8. The container water cover for the evaporator cylinder according to claim 1, characterized in that The thickness of the flat cover is 1 / 6~1 / 4 of the thickness of the protruding elliptical water cover.

9. An evaporator, characterized in that A container water cover for an evaporator cylinder as described in any one of claims 1 to 8 is used.

10. A unit, characterized in that The evaporators described in claim 9 are connected in series to form a series countercurrent unit.

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