Heat exchanger and heating and ventilation equipment

Abstract

The heat exchanger comprises a shell, a plurality of heat exchange pipes, an outflow pipe and a flow mixing structure, the shell is provided with an outflow cavity, the heat exchange pipes are arranged in the shell, outlets of the heat exchange pipes are communicated with the outflow cavity, the outflow pipe is communicated with the outflow cavity, and the outflow pipe is provided with a temperature sensor interface and the flow mixing structure. And the flow mixing structure is arranged in the outflow cavity or the outflow pipe, is arranged on the upstream of the temperature sensor interface and is used for mixing fluids flowing out of the heat exchange pipes. The flow mixing structure is arranged on the upstream of the temperature sensor connector of the heat exchanger, the flow mixing structure can be a multi-plate type channel structure for increasing the fluid mixing distance and can also be an impeller structure for uniformly mixing the fluid through rotation, and the flow mixing structure mixes the fluid flowing out of the at least two heat exchange pipes. And the temperature detected by the temperature sensor is closer to the fluid outflow temperature of the heat exchanger, so that the detected temperature is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a heat exchanger. The utility model also relates to a HVAC device. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] At present, large chillers have many heat exchange tubes in heat exchangers, and the outlet water temperatures of heat exchange tubes in different areas are different. Since the mixing distance of the water chamber is relatively short, water of different temperatures cannot be fully mixed effectively, resulting in a large temperature deviation in the temperature sensor test, which affects the control target of the unit and thus affects the stability of the unit operation. Utility Model Content

[0004] The purpose of the utility model is to at least solve the technical problem of inaccurate temperature measurement of water outlet of the existing heat exchanger. This purpose is achieved through the following technical solutions:

[0005] The first aspect of the utility model provides a heat exchanger, comprising:

[0006] a housing having an outflow cavity;

[0007] A plurality of heat exchange tubes, wherein the plurality of heat exchange tubes are arranged in the shell, and outlets of the plurality of heat exchange tubes are all connected to the outflow cavity;

[0008] an outflow pipe, connected to the outflow cavity, and provided with a temperature sensor interface;

[0009] A flow mixing structure is arranged in the outflow chamber and / or the outflow pipe and is arranged upstream of the temperature sensor interface. The flow mixing structure is used to mix the fluids flowing out of the multiple heat exchange tubes.

[0010] The utility model arranges a mixing flow structure upstream of the temperature sensor interface of the heat exchanger, and the mixing flow structure mixes the fluids flowing out of at least two heat exchange tubes, so that the temperature detected by the temperature sensor is closer to the fluid outflow temperature of the heat exchanger, thereby making the detected temperature more accurate.

[0011] In addition, the heat exchanger according to the utility model may also have the following additional technical features:

[0012] In some embodiments of the present invention, the shell further has a heat exchange chamber and an inflow chamber, the heat exchange chamber, the inflow chamber and the outflow chamber are separated from each other, the multiple heat exchange tubes are arranged in the heat exchange chamber, and the inlets of the multiple heat exchange tubes are all connected to the inflow chamber.

[0013] In some embodiments of the utility model, the shell is a cylindrical structure, and along the axial direction of the shell, the inflow chamber and the outflow chamber are arranged at the axial first end of the shell, and along the radial direction of the shell, the inflow chamber and the outflow chamber are arranged at intervals, and the heat exchange chamber is arranged closer to the axial second end of the shell than the outflow chamber and the inflow chamber.

[0014] In some embodiments of the present invention, the mixed flow structure includes a plurality of baffles arranged in the outflow cavity, and the baffles are arranged at an angle to the axial direction of the outlet end of the heat exchange tube.

[0015] In some embodiments of the present invention, the shell is a cylindrical structure, and the multiple baffles are arranged at intervals along the axial direction of the shell, and among the multiple baffles, the projections of at least two of the baffles along the axial direction of the shell have an overlapping area.

[0016] In some embodiments of the present invention, a flow channel is defined between two adjacent baffles, and a cross-sectional area of ​​the flow channel along the axial direction of the shell is larger than a radial cross-sectional area of ​​the outlet pipe.

[0017] In some embodiments of the present invention, along the axial direction of the shell, the baffle plate located at the head end is arranged opposite to the outlets of the plurality of heat exchange tubes.

[0018] In some embodiments of the present invention, along the axial direction of the shell, the baffle located at the tail end is arranged opposite to the inlet of the outflow pipe.

[0019] In some embodiments of the present invention, the mixed flow structure includes an impeller disposed in the outlet pipe, and the impeller is configured to rotate under the action of the fluid flowing out of the heat exchange tube.

[0020] The second aspect of the utility model provides a HVAC device having the heat exchanger provided in the first aspect of the utility model.

[0021] The HVAC equipment proposed in the second aspect of the utility model has the same beneficial effects as the heat exchanger proposed in the first aspect of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0023] Figure 1The schematic diagram of the structure of the heat exchanger according to the embodiment of the utility model is schematically shown;

[0024] Figure 2 The structure diagram of the heat exchanger (the end of the shell is omitted) according to the embodiment of the utility model is schematically shown;

[0025] Figure 3 The cross-sectional structure diagram of the end portion of the heat exchanger according to the embodiment of the present utility model is schematically shown;

[0026] Figure 4 The schematic diagram of the structure of the outlet pipe equipped with an impeller according to the embodiment of the utility model is schematically shown;

[0027] The symbols in the accompanying drawings are as follows:

[0028] 10. Shell; 11. Heat exchange tube; 12. Outflow pipe; 13. Outflow chamber; 14. Inflow chamber; 15. Inflow pipe; 16. Temperature sensor interface; 17. Mixed flow structure; 171. Baffle; 18. Heat exchange chamber; 19. Flow channel; 20. Partition; 21. Tube sheet; 22. Impeller. DETAILED DESCRIPTION

[0029] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0030] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0031] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0032] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0033] like Figures 1 to 4 As shown, Figure 3 The portion of the middle heat exchange tube 11 in the heat exchange chamber 18 is not shown. Figure 3 A direction indicates the axial direction of the shell 10, and B direction indicates the radial direction of the shell 10. The first aspect of the utility model proposes a heat exchanger, which includes a shell 10, a plurality of heat exchange tubes 11, an outflow pipe 12 and a mixing structure 17. The shell 10 has an outflow cavity 13, the heat exchange tubes 11 are arranged in the shell 10, and the outlets of all the heat exchange tubes 11 are connected to the outflow cavity 13, the outflow pipes 12 are connected to the outflow cavity 13, the outflow pipes 12 are provided with a temperature sensor interface 16, the mixing structure 17 is arranged in the outflow cavity 13 and / or the outflow pipe 12, and is arranged upstream of the temperature sensor interface 16, and the mixing structure 17 is used to mix the fluids flowing out of at least two heat exchange tubes 11.

[0034] It is understandable that the heat exchanger can be a shell and tube heat exchanger, or other heat exchangers with multiple heat exchange channels and requiring temperature measurement at the outlet. The shell and tube heat exchanger has a cylindrical shell 10, in which a heat exchange chamber 18 is formed, and an outflow chamber 13, i.e., a water outlet chamber, is provided at the end of the shell 10. The heat exchange chamber 18 and the outflow chamber 13 can be separated by a plate. The heat exchange tube 11 can be a U-shaped structure to provide a longer heat exchange distance. The two ends of the heat exchange tube 11 are respectively connected to the inflow chamber 14 and the outflow chamber 13. When the fluid to be heat exchanged enters the heat exchange tube 11 from the inflow chamber 14, it exchanges heat with the fluid in the heat exchange chamber 18 in the shell 10, and then flows out from the outflow chamber 13. Multiple heat exchange tubes 11 can be arranged at intervals to increase the indirect contact area of ​​the fluid during heat exchange, thereby improving the heat exchange efficiency. Multiple perforations can be arranged on the walls of the outflow chamber 13 and the inflow chamber 14 to connect with multiple heat exchange tubes 11 one by one. The fluid after heat exchange flows from the outflow chamber 13 to the outflow pipe 12, and a temperature sensor interface 16 is provided on the outflow pipe 12 for installing the temperature sensor. The utility model sets a mixing flow structure 17 upstream of the temperature sensor, and mixes the fluids flowing out of multiple heat exchange pipes 11 by lengthening the flow distance and setting a baffle 171, so that the fluid flowing to the outflow pipe 12 is more uniform, thereby making the temperature detected by the temperature sensor more accurate.

[0035] The utility model sets a mixing flow structure 17 in the outflow chamber 13 and / or the outflow pipe 12 upstream of the temperature sensor interface 16 of the heat exchanger. The mixing flow structure 17 can be a multi-plate channel structure that increases the fluid mixing distance, or it can be an impeller structure that mixes the fluid evenly through rotation. The mixing flow structure 17 mixes the fluids flowing out of at least two heat exchange tubes 11, so that the temperature detected by the temperature sensor is closer to the fluid outflow temperature of the heat exchanger, thereby making the detected temperature more accurate.

[0036] In some embodiments of the present invention, the shell 10 also has a heat exchange chamber 18 and an inflow chamber 14. The heat exchange chamber 18, the inflow chamber 14 and the outflow chamber 13 are separated from each other. The heat exchange tube 11 is arranged in the heat exchange chamber 18, and the inlet of the heat exchange tube 11 is respectively connected to the inflow chamber 14.

[0037] It can be understood that the shell 10 defines a heat exchange chamber 18 and an inflow chamber 14, and the heat exchange chamber 18 is separated from the outflow chamber 13 and the inflow chamber 14 by a tube sheet 21. The inflow chamber 14 can be provided with an inflow tube 15 for the fluid to be heat exchanged to enter the inflow chamber 14. The tube sheet 21 has a plurality of perforations for fixing the heat exchange tubes 11. The tube sheet 21 is arranged parallel to the radial direction of the shell 10 and matches the radial cross section inside the shell 10. The inflow chamber 14 and the outflow chamber 13 are arranged to concentrate the fluid to facilitate the fluid to enter and exit the heat exchanger. The heat exchange medium is introduced by the heat exchange chamber 18, and heat exchange is achieved by indirect contact.

[0038] In some embodiments of the utility model, along the axial direction of the shell 10, the inflow chamber 14 and the outflow chamber 13 are arranged at the axial first end of the shell 10, and along the radial direction of the shell 10, the inflow chamber 14 and the outflow chamber 13 are arranged at intervals, and the heat exchange chamber 18 is arranged closer to the axial second end of the shell 10 than the outflow chamber 13 and the inflow chamber 14.

[0039] It can be understood that the inflow chamber 14 and the outflow chamber 13 are located at the first axial end of the shell 10, and in the radial direction of the shell 10, the outflow chamber 13 and the inflow chamber 14 are arranged in sequence. The heat exchange chamber 18 is arranged between the second axial end of the shell 10 and the tube sheet 21. Such an arrangement makes the overall structure more compact. In addition, the inflow and outflow of the fluid are at the same end of the shell 10, which is convenient for arranging the pipeline. At the same time, the first axial end of the shell 10 can be set to an openable structure for easy maintenance.

[0040] In some embodiments of the present invention, the flow mixing structure 17 includes a plurality of baffles 171 in the outflow cavity 13 , and the baffles 171 are arranged at an angle to the axial direction of the outlet end of the heat exchange tube 11 .

[0041] It can be understood that the baffle 171 is a plate-shaped structure, which can be a straight plate or an arc-shaped plate. The baffle 171 can be connected to the inner wall of the shell 10 by welding or bolting to be fixed in the outflow chamber 13. The plate surface of the baffle 171 is set at an angle to the axial direction of the outlet end of the heat exchange tube 11, and can be set vertically, so that the fluid flowing out of the heat exchange tube 11 can impact the baffle 171, so that the outflowing fluid is mixed in the outflow chamber 13, so as to improve the uniformity of the fluid in the outflow tube 12, thereby improving the temperature accuracy detected by the temperature sensor.

[0042] In some embodiments of the present invention, along the axial direction of the shell 10 , the heat exchange tube 11 is communicated with one side of the outflow cavity 13 , and the outflow tube 12 is communicated with the other side of the outflow cavity 13 .

[0043] It is understandable that the outlet end of the heat exchange tube 11 is arranged on one side of the outflow cavity 13, and the outflow tube 12 is arranged on the other side opposite to the outflow cavity 13, so that the flow passage 19 is conveniently arranged in the outflow cavity 13 to mix the flow by deflecting and extending the flow distance. Specifically, along the axial direction of the shell 10, the tube sheet 21 can be arranged on one side of the outflow cavity 13, the outlet end of the heat exchange tube 11 is inserted into the perforation on the tube sheet 21 to achieve connection, and the outflow tube 12 can be fixed on the other side of the outflow cavity 13 by welding.

[0044] In some embodiments of the present invention, a plurality of baffles 171 are arranged at intervals, and projections of at least two baffles 171 along the axial direction of the shell 10 have overlapping areas.

[0045] It can be understood that, among two adjacent baffles 171, along the radial direction of the shell 10, one of the baffles 171 is connected to the cavity wall of the outflow chamber 13 on the side close to the inflow chamber 14 and is separated from the cavity wall of the outflow chamber 13 on the side away from the inflow chamber 14, and one end of the other baffle 171 is connected to the cavity wall of the outflow chamber 13 on the side away from the inflow chamber 14 and is separated from the cavity wall of the outflow chamber 13 on the side close to the inflow chamber 14.

[0046] Specifically, the inflow chamber 14 and the outflow chamber 13 are separated by a partition 20. The outflow chamber 13 is defined between the partition 20, a part of the tube sheet 21 and a part of the shell 10, and a plurality of baffles 171 are staggered up and down along the radial direction of the shell 10, so that an S-shaped flow channel 19 is formed in the outflow chamber 13, so that the flow distance of the fluid in the outflow chamber 13 is extended, so that the fluids flowing out of different heat exchange tubes 11 are fully mixed, so that the fluids are fully mixed without increasing additional power consumption, so as to improve the uniformity of the temperature detection point.

[0047] In some embodiments of the present invention, a flow passage 19 is defined between two adjacent baffles 171, and the cross-sectional area of ​​the flow passage 19 along the axial direction of the shell 10 is larger than the radial cross-sectional area of ​​the outflow pipe 12. The flow area between the end of the baffle 171 and the partition 20 or the shell 10 is also larger than the radial cross-sectional area of ​​the outflow pipe 12.

[0048] It can be understood that multiple baffles 171 are arranged at intervals to form an S-shaped flow channel 19. Along the axial direction of the shell 10, the cross-sectional area of ​​the flow channel 19 is the flow area of ​​the flow channel 19, which is larger than the radial cross-sectional area of ​​the outlet pipe 12. Therefore, under the condition of the same flow rate, the flow velocity of the flow channel 19 is smaller than the flow velocity of the outlet pipe 12, thereby improving the mixing effect in the outflow chamber 13.

[0049] In some embodiments of the utility model, along the axial direction of the shell 10, the baffle 171 located at the head end is arranged opposite to the outlets of multiple heat exchange tubes 11, and / or the baffle 171 located at the tail end is arranged opposite to the inlet of the outflow tube 12.

[0050] It can be understood that the baffle 171 is positioned at the outlet of the heat exchange tube 11 so that the fluid flowing out of the heat exchange tube 11 can collide with the baffle 171, thereby mixing the fluid in the outflow chamber 13. Furthermore, the baffle 171 at the tail end is also positioned at the inlet of the outflow tube 12, so that the fluid mixed through the flow channel 19 can be guided by the baffle 171 at the tail end to flow out of the outflow tube 12, thereby reducing the phenomenon of backflow of the mixed fluid and improving the mixing effect.

[0051] In some embodiments of the present invention, the mixed flow structure 17 includes an impeller 22 , and the impeller 22 is configured to rotate under the flow of the fluid flowing out of the heat exchange tube 11 .

[0052] It is understandable that the impeller 22 can refer to the existing impeller structure, and the impeller 22 can rotate under the flow of the fluid, thereby further mixing the fluid, so that the fluid temperature detected by the temperature sensor located downstream of the impeller 22 is more accurate. Specifically, the impeller 22 can be disposed in the outlet pipe 12 and coaxially disposed with the outlet pipe 12.

[0053] The second aspect of the utility model provides a HVAC device having the heat exchanger provided in the first aspect of the utility model.

[0054] The HVAC equipment proposed in the second aspect of the present invention has the same beneficial effects as the heat exchanger proposed in the first aspect of the present invention. The HVAC equipment may be a large chiller or the like.

[0055] The above are only preferred specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A heat exchanger, characterized in that: The heat exchanger comprises: a housing having an outflow cavity; A plurality of heat exchange tubes, wherein the plurality of heat exchange tubes are arranged in the shell, and outlets of the plurality of heat exchange tubes are all connected to the outflow cavity; an outflow pipe, connected to the outflow cavity, and provided with a temperature sensor interface; A flow mixing structure is arranged in the outflow chamber and / or the outflow pipe and is arranged upstream of the temperature sensor interface. The flow mixing structure is used to mix the fluids flowing out of the multiple heat exchange tubes.

2. The heat exchanger according to claim 1, characterized in that: The shell also has a heat exchange cavity and an inflow cavity. The heat exchange cavity, the inflow cavity and the outflow cavity are separated from each other. The multiple heat exchange tubes are arranged in the heat exchange cavity, and the inlets of the multiple heat exchange tubes are all connected to the inflow cavity.

3. The heat exchanger according to claim 2, characterized in that: The shell is a cylindrical structure. Along the axial direction of the shell, the inflow chamber and the outflow chamber are arranged at the axial first end of the shell, and along the radial direction of the shell, the inflow chamber and the outflow chamber are arranged at intervals, and the heat exchange chamber is arranged closer to the axial second end of the shell than the outflow chamber and the inflow chamber.

4. The heat exchanger according to any one of claims 1 to 3, characterized in that: The mixed flow structure includes a plurality of baffles arranged in the outflow cavity, and the baffles are arranged at an angle to the axial direction of the outlet end of the heat exchange tube.

5. The heat exchanger according to claim 4, characterized in that The shell is a cylindrical structure. Along the axial direction of the shell, the multiple baffles are arranged at intervals, and among the multiple baffles, the projections of at least two of the baffles along the axial direction of the shell have an overlapping area.

6. The heat exchanger according to claim 5, characterized in that A flow passage is defined between two adjacent baffles, and a cross-sectional area of ​​the flow passage along the axial direction of the shell is larger than a radial cross-sectional area of ​​the outflow pipe.

7. The heat exchanger according to claim 5, characterized in that Along the axial direction of the shell, the baffle plate located at the head end is arranged opposite to the outlets of the plurality of heat exchange tubes.

8. The heat exchanger according to claim 7, characterized in that Along the axial direction of the shell, the baffle at the tail end is arranged opposite to the inlet of the outflow pipe.

9. The heat exchanger according to any one of claims 1 to 3, characterized in that: The mixed flow structure includes an impeller disposed in the outlet pipe, and the impeller is configured to be able to rotate under the action of the fluid flowing out of the heat exchange tube.

10. A HVAC equipment, characterized in that: A heat exchanger according to any one of claims 1 to 9 is provided.

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