Gas-gas heat exchanger
By designing a combination of multiple increasingly larger inner cylinders and outer cylinders in the plate heat exchanger, the problem of poor sealing properties of plate heat exchangers during high-pressure gas heat exchange is solved, and higher sealing properties and heat exchange efficiency are achieved.
Patent Information
- Application Number
- CN202420922966.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-04-29
AI Technical Summary
When the existing plate heat exchanger is high-pressure air heat exchanger, the sealing gaskets provided on the two adjacent plates are prone to deteriorate the sealing properties of the lower and lower parts for a long time, resulting in leakage.
An air heat exchanger is designed, using multiple increasingly larger inner cylinders to cooperate with the outer cylinder to exchange heat. The inner cylinder itself is not easy to leak, and the outer cylinder can perform secondary leakage prevention of gas leaked from the inner cylinder.
Improves the sealing of the heat exchanger, avoids leakage problems, and maintains efficient heat exchange performance.
Smart Images
Figure CN222617673U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchange equipment, in particular to an air-to-air heat exchanger. Background Art
[0002] The plate heat exchanger is a new type of high-efficiency heat exchanger made of a series of stacked plates with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. It has the characteristics of high heat exchange efficiency, low heat loss, compact and lightweight structure, etc.
[0003] In practice, it is found that the sealing gaskets provided between two adjacent plates of a plate heat exchanger deteriorate in sealing performance after long-term use, especially during high-pressure gas-to-gas heat exchange, and are prone to leakage. Utility Model Content
[0004] In view of the deficiencies in the prior art, the utility model provides an air-to-air heat exchanger, which can solve or at least alleviate one or more of the above-mentioned problems and other problems in the prior art.
[0005] The utility model provides an air-to-air heat exchanger, comprising:
[0006] An outer cylinder, two ends of which are an inlet and an outlet, respectively, and the inlet and the outlet are used for the inflow and outflow of the first gas respectively;
[0007] A plurality of inner cylinders of gradually larger sizes are arranged in the outer cylinder along the same center line, the plurality of inner cylinders are nested layer by layer from the inside to the outside, and the side wall of each inner cylinder is hollow to form a cylindrical heat exchange cavity;
[0008] An air inlet mechanism, used for inputting a second gas into one end of the plurality of heat exchange chambers; and
[0009] The gas outlet mechanism is used to output the second gas from the other end of the heat exchange cavity.
[0010] Preferably, a plurality of first guide vanes arranged obliquely relative to the center line thereof are respectively provided on the inner circumferential wall of the outer cylinder and the inner circumferential wall of the inner cylinder, and the plurality of first guide vanes are distributed along a spiral trajectory.
[0011] Preferably, a plurality of second guide vanes arranged obliquely relative to the center line of the heat exchange chamber are provided on the inner wall of the heat exchange chamber, and the plurality of second guide vanes are distributed along a spiral trajectory.
[0012] Preferably, the plurality of inner cylinders are arranged at equal intervals.
[0013] Preferably, the air intake mechanism includes a plurality of air intake pipes, each of the air intake pipes has an inner cylinder corresponding to it, one end of each of the air intake pipes passes through the side wall of the outer cylinder and is connected to the heat exchange cavity of the corresponding inner cylinder, and the air intake pipe is used for the inflow of the second gas; the plurality of air intake pipes are arranged obliquely relative to the center line of the inner cylinder.
[0014] Preferably, the inner cylinder is a cylinder, and the axis of the air inlet pipe is arranged to be inclined relative to the radial direction of the inner cylinder.
[0015] Preferably, the air intake mechanism further comprises:
[0016] A mixed flow shell is hollow and is connected to ends of the plurality of air inlet pipes away from the outer cylinder at the same time; and
[0017] An air pump is communicated with the mixing flow shell and is used for conveying the second gas.
[0018] Preferably, the air outlet mechanism includes a plurality of air outlet pipes, each of which corresponds to the inner tube one by one, and one end of each of which passes through the side wall of the outer tube and is connected to the corresponding heat exchange chamber, and the air outlet pipe is used for the second gas to flow out; the first air inlet pipe and the air outlet pipe are respectively located at the two ends of the inner tube.
[0019] Compared with the prior art, the utility model has the following beneficial effects:
[0020] In the utility model, the inner cylinder cooperates with the outer cylinder to exchange heat, and the inner cylinder itself is not easy to leak. In addition, the inner cylinder is located inside the outer cylinder, and the outer cylinder can perform secondary leakage prevention on the gas leaked from the inner cylinder. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.
[0022] Figure 1 A three-dimensional diagram of an air-to-air heat exchanger in one embodiment of the utility model;
[0023] Figure 2 for Figure 1 Internal stereogram of
[0024] Figure 3 for Figure 2 View at point A;
[0025] Figure 4 for Figure 3 View at point B;
[0026] Figure 5 for Figure 3 An enlarged schematic diagram of the inner cylinder.
[0027] Reference numerals:
[0028] 10. Outer cylinder; 11. Inlet; 12. Exit;
[0029] 20. Inner cylinder; 21. Heat exchange chamber;
[0030] 30. Intake mechanism; 31. Intake pipe; 32. Mixed flow housing; 33. Air pump;
[0031] 40. Exhaust mechanism; 41. Exhaust pipe;
[0032] 50. a first guide vane;
[0033] 60. Second guide vane. DETAILED DESCRIPTION
[0034] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.
[0035] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.
[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0037] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically limited.
[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0039] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0040] See also Figures 1 to 5 This embodiment provides an air-to-air heat exchanger, including an outer cylinder 10, a plurality of inner cylinders 20 with gradually larger sizes, an air inlet mechanism 30 and an air outlet mechanism 40.
[0041] The two ends of the outer cylinder 10 are respectively an inlet 11 and an outlet 12, and the inlet 11 and the outlet 12 are used for the inflow and outflow of the first gas, respectively. Multiple inner cylinders 20 of gradually larger sizes are all arranged in the outer cylinder 10 with the same center line (the inner cylinder 20 and the outer cylinder 10 have the same center line), and the multiple inner cylinders 20 are nested layer by layer from the inside to the outside. Specifically, the nesting layer by layer is: an inner cylinder 20 of a larger size is set outside an inner cylinder 20 of a smaller size, and multiple inner cylinders 20 repeat this process. In addition to being a cylinder, the inner cylinder 20 and the outer cylinder 10 can also be a square cylinder, etc.
[0042] The side wall of each inner cylinder 20 is hollow to form a cylindrical heat exchange chamber 21. The profile of the heat exchange chamber 21 is also cylindrical, and the cross section of the heat exchange chamber 21 is annular. The air inlet mechanism 30 is used to input the second gas into one end of the plurality of heat exchange chambers 21. The air outlet mechanism 40 is used to output the second gas from the other end of the heat exchange chamber 21. One of the first gas and the second gas is a high-temperature gas, and the other is a low-temperature gas.
[0043] In this embodiment, the first gas flows in from the inlet 11 of the outer tube 10 and flows out from the outlet 12, passing through multiple inner tubes 20. The inner and outer walls of the inner tube 20 are equivalent to the two plates of the traditional plate heat exchanger. The second gas is input from one end of the inner tube 20 through the air inlet mechanism 30 and flows out from the other end of the inner tube 20 through the air outlet mechanism 40. The first gas exchanges heat with the inner tube 20 when flowing through the inner wall and outer wall of the inner tube 20, and the second gas exchanges heat with the inner wall and outer wall of the inner tube 20 in the heat exchange chamber 21. The inner tube 20 is kept sealed by integral molding or welding. Compared with the sealing method of the plate and the sealing gasket of the plate heat exchanger, the inner tube 20 has a simple structure, good sealing, and is not easy to leak. In addition, even if the inner tube 20 is not well sealed and the second gas leaks into the outer tube 10, the outer tube 10 also acts as an isolation. Overall, the sealing is good and the second gas will not leak out of the outer tube 10. For some toxic gases, the safety is improved.
[0044] In addition, when the first gas is a low-temperature gas and the second gas is a high-temperature gas, the outer wall temperature of the outer tube 10 will be low and will not burn the staff. Moreover, the heat exchanger is equivalent to a deformation of a plate heat exchanger. On the basis of ensuring the sealing performance, the inner tube 20 is equivalent to the annular arrangement of the plate heat exchanger plates, which has a higher heat exchange efficiency.
[0045] In one embodiment, a plurality of first guide vanes 50 arranged obliquely relative to the center line are respectively disposed on the inner circumferential wall of the outer cylinder 10 and the inner circumferential wall of the inner cylinder 20, and the plurality of first guide vanes 50 are distributed along a spiral trajectory. Specifically, the first guide vanes 50 on the inner circumferential wall of the outer cylinder 10 are not shown in the figure, and their arrangement is the same as that of the first guide vanes 50 on the inner circumferential wall of the inner cylinder 20.
[0046] In this embodiment, when the first gas flows in the outer tube 10 and passes through the first guide plate 50, it is guided by the first guide plate 50 and moves forward in a spiral trajectory. On the one hand, the internal turbulence of the first gas moving forward in the spiral trajectory increases, so that the first gas can fully contact the inner and outer walls of the inner tube 20, thereby further improving the heat exchange efficiency (in comparison, if the first gas flows along a straight line through the inner and outer walls of the inner tube 20, it is mainly the first gas close to the inner and outer walls of the inner tube 20 that will participate in the heat exchange).
[0047] In one embodiment, a plurality of second guide vanes 60 arranged obliquely relative to the center line of the heat exchange chamber 21 are disposed on the inner wall of the heat exchange chamber 21, and the plurality of second guide vanes 60 are distributed along a spiral trajectory. The second guide vanes 60 of this embodiment can guide the second gas with reference to the first guide vanes 50.
[0048] In one embodiment, the channel formed between two adjacent inner cylinders 20 is used for the first gas to flow through. Since the multiple inner cylinders 20 are arranged at equal intervals, the inner wall and outer wall of each inner cylinder 20 can be in contact with sufficient first gas, thereby achieving approximately the same heat exchange efficiency.
[0049] In one embodiment, the air intake mechanism 30 includes a plurality of air intake pipes 31, each of which has an inner cylinder 20 corresponding thereto, one end of each air intake pipe 31 passes through the side wall of the outer cylinder 10 and is connected to the corresponding heat exchange chamber 21 of the inner cylinder 20, and the air intake pipe 31 is used for the inflow of the second gas; the plurality of air intake pipes 31 are arranged obliquely relative to the center line of the inner cylinder 20 (the angle between the axis of the air intake pipe 31 and the center line of the inner cylinder 20 is between 0 degrees and 90 degrees).
[0050] In this embodiment, the air inlet pipe 31 is arranged at an angle, giving the second gas an initial velocity to move toward one end of the air outlet mechanism 40 , which is beneficial for the second gas to move in the heat exchange chamber 21 .
[0051] In one embodiment, the inner cylinder 20 is a cylinder, and the axis of the air inlet pipe 31 is arranged to be inclined relative to the radial direction of the inner cylinder 20 .
[0052] In this embodiment, the air inlet cylinder inputs the second gas into the heat exchange chamber 21, so that the second gas entering the heat exchange chamber 21 has an initial speed moving along a spiral trajectory. As a result, the second gas collides with the two side walls of the heat exchange chamber 21 when moving, causing a certain turbulence of the second gas. While keeping the moving direction of the second gas unchanged, the second gas can fully exchange heat with the inner cylinder 20.
[0053] In one embodiment, the air intake mechanism 30 further includes a mixing flow housing 32 and an air pump 33 .
[0054] The mixed flow housing 32 is hollow and is connected to one end of the plurality of air inlet pipes 31 away from the outer cylinder 10. The air pump 33 is connected to the mixed flow housing 32 and is used to deliver the second gas.
[0055] In this embodiment, the air pump 33 is also connected to an air delivery pipe, and the air pump 33 provides power to the second gas, and the second gas is evenly distributed in the mixed flow shell 32, and then transported to different heat exchange chambers 21 along different intake pipes 31. When the second gas entering a certain intake pipe 31 is less than that of other intake pipes 31, the pressure in the intake pipe 31 is small, and more of the second gas in the mixed flow shell flows to the intake pipe 31, so that the gas pressure of the second gas in multiple intake pipes 31 remains roughly the same, and the gas pressure in each heat exchange chamber 21 is the same, and the heat exchange efficiency is maximized.
[0056] In one embodiment, the gas outlet mechanism 40 includes multiple gas outlet pipes 41, each gas outlet pipe 41 corresponds to the inner tube 20 one by one, and one end of each gas outlet pipe 41 passes through the side wall of the outer tube 10 and is connected to the corresponding heat exchange chamber 21, and the gas outlet pipe 41 is used for the second gas to flow out; the first gas inlet pipe 31 and the gas outlet pipe 41 are respectively located at the two ends of the inner tube 20.
[0057] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.
[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.
Claims
1. An air-to-air heat exchanger, characterized in that: include: An outer cylinder (10) having an inlet (11) and an outlet (12) at both ends thereof, and the inlet (11) and the outlet (12) are used for the inflow and outflow of a first gas respectively; A plurality of inner cylinders (20) of gradually larger sizes are arranged in the outer cylinder (10) along the same center line, the plurality of inner cylinders (20) are nested layer by layer from the inside to the outside, and the side wall of each inner cylinder (20) is hollow to form a cylindrical heat exchange chamber (21); An air intake mechanism (30) for inputting a second gas into one end of the plurality of heat exchange chambers (21); as well as The gas outlet mechanism (40) is used to output the second gas from the other end of the heat exchange chamber (21).
2. The gas-to-gas heat exchanger according to claim 1, characterized in that: A plurality of first guide vanes (50) arranged obliquely relative to their center lines are respectively provided on the inner circumferential wall of the outer cylinder (10) and the inner circumferential wall of the inner cylinder (20), and the plurality of first guide vanes (50) are distributed along a spiral trajectory.
3. The gas-to-gas heat exchanger according to claim 1, characterized in that: A plurality of second guide vanes (60) arranged obliquely relative to the center line of the heat exchange cavity (21) are provided on the inner wall of the heat exchange cavity (21), and the plurality of second guide vanes (60) are distributed along a spiral trajectory.
4. The gas-to-gas heat exchanger according to claim 1, characterized in that: The plurality of inner cylinders (20) are arranged at equal intervals.
5. The gas-to-gas heat exchanger according to claim 1, characterized in that: The air intake mechanism (30) comprises a plurality of air intake pipes (31), each of the air intake pipes (31) corresponding to an inner cylinder (20), one end of each of the air intake pipes (31) passing through the side wall of the outer cylinder (10) and communicating with the heat exchange cavity (21) of the corresponding inner cylinder (20), and the air intake pipe (31) is used for the inflow of the second gas; the plurality of air intake pipes (31) are arranged obliquely relative to the center line of the inner cylinder (20).
6. The gas-to-gas heat exchanger according to claim 5, characterized in that: The inner cylinder (20) is a cylinder, and the axis of the air inlet pipe (31) is arranged to be inclined relative to the radial direction of the inner cylinder (20).
7. The gas-to-gas heat exchanger according to claim 5, characterized in that: The air intake mechanism (30) further comprises: A mixing flow shell (32) is hollow, and the mixing flow shell (32) is simultaneously connected to ends of the plurality of air inlet pipes (31) away from the outer cylinder (10); and An air pump (33) is connected to the mixing flow housing (32) and is used to transport the second gas.
8. The gas-to-gas heat exchanger according to claim 7, characterized in that: The gas outlet mechanism (40) comprises a plurality of gas outlet pipes (41), each of the gas outlet pipes (41) corresponding to the inner tube (20) one by one, one end of each gas outlet pipe (41) passing through the side wall of the outer tube (10) and communicating with the corresponding heat exchange cavity (21), and the gas outlet pipe (41) is used for the second gas to flow out; the first gas inlet pipe (31) and the gas outlet pipe (41) are respectively located at two ends of the inner tube (20).