EP2759796B1 - Self-pumping heat exchange unit - Google Patents

Self-pumping heat exchange unit Download PDF

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Publication number
EP2759796B1
EP2759796B1 EP14382024.9A EP14382024A EP2759796B1 EP 2759796 B1 EP2759796 B1 EP 2759796B1 EP 14382024 A EP14382024 A EP 14382024A EP 2759796 B1 EP2759796 B1 EP 2759796B1
Authority
EP
European Patent Office
Prior art keywords
heat exchange
exchange unit
self
rotary rod
pumping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14382024.9A
Other languages
German (de)
French (fr)
Other versions
EP2759796A2 (en
EP2759796A3 (en
Inventor
Marcos Antonio Alarcon Gonzalez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HRS Investments Ltd
Original Assignee
HRS Investments Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP2759796A2 publication Critical patent/EP2759796A2/en
Publication of EP2759796A3 publication Critical patent/EP2759796A3/en
Application granted granted Critical
Publication of EP2759796B1 publication Critical patent/EP2759796B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G3/00—Rotary appliances
    • F28G3/08—Rotary appliances having coiled wire tools, i.e. basket type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F28F13/125—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation by stirring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/008—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G3/00—Rotary appliances
    • F28G3/10—Rotary appliances having scrapers, hammers, or cutters, e.g. rigidly mounted
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0042—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for foodstuffs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/08—Fluid driving means, e.g. pumps, fans

Definitions

  • the present invention belongs to the field of heat exchange apparatuses, and more specifically to machines for heat exchange between fluids having the same or different characteristics, applicable in different sectors, such as the food sector, pharmaceutical sector, health sector, etc.
  • the main object of the present invention is a heat exchange unit which fundamentally stands out because it provides a self-pumping effect and keeps the exchange surface clean at all times, improving the heat transfer coefficient and allowing a substantial reduction in head losses through its inner and outer tubes, said head losses being generated by friction of the actual inner walls of the tubes.
  • Machines for heat exchange between fluids which generally have at least one inner tube through which the "product fluid”, i.e., fluid to be heated or cooled, circulates and an outer tube or shell, through which the "service fluid”, i.e., heat transfer fluid, circulates are known today.
  • heat exchangers the inner conduits of which are provided with cleaning means, thus providing a self-cleaning effect on their inner surface and allowing maintenance and a prolonged service life of said heat exchangers, reducing the dead time thereof, are known in the current state of the art.
  • An example of the aforementioned exchangers can be found in Spanish patent application ES2158752 .
  • the international patent Application WO2013/007842 A1 describes a heat-exchanging device, that can be used for the heat treatment of products such as juices, pulp and other food, liquid or particulate products. Nevertheless, current machines for heat exchange between fluids have several problems and drawbacks among which the following stand out:
  • the present invention alleviates the aforementioned drawbacks by providing a self-pumping heat exchange unit which successfully reduces head loss through its conduits, substantially optimizing the heat transfer coefficient, and also allowing regulating and obtaining different pumping flow rates for the product fluid, i.e., fluid to be heated or cooled.
  • the heat exchange unit object of the invention is of the type comprising an outer shell provided with an inlet and an outlet for a "service” fluid, i.e., a heat carrier fluid, being able to be glycol or cold water vapor, thermal oil, etc.; at least one hollow inner tube housed inside the outer shell and also linked to an inlet and an outlet for a product fluid, i.e., fluid to be heated or cooled; an elongated rotary rod arranged inside the at least one inner tube and having cleaning means for cleaning the inner wall of the at least one inner tube.
  • a "service” fluid i.e., a heat carrier fluid
  • a product fluid i.e., fluid to be heated or cooled
  • an elongated rotary rod arranged inside the at least one inner tube and having cleaning means for cleaning the inner wall of the at least one inner tube.
  • head losses must be understood as losses generated by friction of the actual inner walls of the tubes.
  • the heat exchange unit described herein stands out fundamentally because it additionally comprises: scraping elements linked to the rotary rod and suitable for scraping and detaching the product fluid accumulated or fixed on the inner wall of the at least one inner tube; and an endless spiral also linked to the rotary rod, dimensionally suitable for running along and surrounding the rod longitudinally through the spaces existing between the scraping elements, said endless spiral being suitable for displacement of the product fluid circulating through the at least one inner tube, generating a self-pumping effect.
  • the scraping elements preferably have an elongated planar configuration, thus allowing covering the entire the inner surface of the inner tubes, increasing cleaning efficiency.
  • the heat exchange unit comprises three inner tubes. So by means of varying the rotational speed of the rods existing in the inner tubes, and therefore of the endless spiral, it is possible to achieve different pumping flow rates for the product fluid circulating through said inner tubes, which allows improving the heat transfer coefficient and reducing the head losses generated by friction of the actual inner walls of the tubes.
  • the heat exchange unit herein described has been envisaged to be applicable in the food sector, health sector, environmental sector or industrial sector. It can be also used as a regenerative unit, i.e., using one and the same product fluid in both parts of the unit, namely, the shell and the inner tubes, thus recovering the actual energy of the product fluid.
  • the present invention provides a heat exchange unit according to claim 1 which, in addition to efficiently removing residues from the inner wall of the tubes, reducing head loss and substantially improving the heat transfer coefficient, also stands out for obtaining a "self-pumping effect" of the product fluid circulating through said inner tubes, which makes it possible for the requirements of the outer pump to be lower, even to the extent of being able to dispense with said outer pump in some cases, being a more efficient, economical and viable alternative solution than the self-cleaning systems of current heat exchangers.
  • Figure 1 shows a general view of the self-pumping heat exchange unit (1) which comprises:
  • the heat exchange unit (1) additionally comprises a main geared motor (60) connected through a central shaft (70), shown in Figure 4 , with a main gear (71) made of stainless steel, the latter is in turn connected with secondary gears (72) which are linked to the ends of each of the rotary rods (30), as shown in Figure 3 .
  • Said secondary gears (72), depicted in Figures 3 and 4 are manufactured from a plastic material, such that in addition to acting as a safety fuse element, it allows preventing the irritating noise generally produced by the transmissions of the gears.
  • Said Figure 1 also shows an auxiliary geared motor (80) which is coupled to the main geared motor (60) and which allows separating the heat exchange unit into two blocks when connected with a threaded screw and a nut for a quick, simple and comfortable opening of the heat exchange unit (1), facilitating inspection and/or maintenance tasks by qualified personnel.
  • the unit incorporates a lower frame (90), also shown in Figure 1 , making up the base support of the heat exchange unit (1), and which in the present embodiment further comprises an additional telescopic prolongation (91) provided with wheels (92) in the lower portion, thus facilitating its movement and allowing it to take up minimum space.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Cleaning In General (AREA)

Description

    Object of the Invention
  • The present invention belongs to the field of heat exchange apparatuses, and more specifically to machines for heat exchange between fluids having the same or different characteristics, applicable in different sectors, such as the food sector, pharmaceutical sector, health sector, etc.
  • The main object of the present invention is a heat exchange unit which fundamentally stands out because it provides a self-pumping effect and keeps the exchange surface clean at all times, improving the heat transfer coefficient and allowing a substantial reduction in head losses through its inner and outer tubes, said head losses being generated by friction of the actual inner walls of the tubes.
    • Background of the Invention
  • Machines for heat exchange between fluids which generally have at least one inner tube through which the "product fluid", i.e., fluid to be heated or cooled, circulates and an outer tube or shell, through which the "service fluid", i.e., heat transfer fluid, circulates are known today.
  • More specifically, heat exchangers the inner conduits of which are provided with cleaning means, thus providing a self-cleaning effect on their inner surface and allowing maintenance and a prolonged service life of said heat exchangers, reducing the dead time thereof, are known in the current state of the art. An example of the aforementioned exchangers can be found in Spanish patent application ES2158752 . On the other hand, the international patent Application WO2013/007842 A1 describes a heat-exchanging device, that can be used for the heat treatment of products such as juices, pulp and other food, liquid or particulate products. Nevertheless, current machines for heat exchange between fluids have several problems and drawbacks among which the following stand out:
    • They have a high head loss, which causes a considerable and significant decrease in machine performance.
    • The inner walls of their tubes experience very high pumping pressures with the risks and problems it entails, particularly in cases of high viscosity fluids or fluids with a concentration of solids.
    • They do not allow regulating or modifying the pumping flow rate of the product fluid since it is predetermined by the pump before the machines are connected thereto.
    • Their shells are single-pass shells, so they have a low heat transfer coefficient, in addition to involving a greater demand for pumping the service fluid to the pump, increasing costs.
    • The inner walls of the inner tubes are not completely cleaned, the cleaning means not acting on parts or sections of said tubes.
    • They must be connected to a pump which moves and pumps the fluids circulating through the inside of the tubes.
    • The mechanisms for opening current exchange machines when performing inspection and maintenance tasks are complex, slow and tedious mechanisms.
    • They are only operative for a specific type of low viscosity or high viscosity fluids, but without the possibility of working with both fluids.
    Description of the Invention
  • The present invention alleviates the aforementioned drawbacks by providing a self-pumping heat exchange unit which successfully reduces head loss through its conduits, substantially optimizing the heat transfer coefficient, and also allowing regulating and obtaining different pumping flow rates for the product fluid, i.e., fluid to be heated or cooled.
  • More particularly, the heat exchange unit object of the invention is of the type comprising an outer shell provided with an inlet and an outlet for a "service" fluid, i.e., a heat carrier fluid, being able to be glycol or cold water vapor, thermal oil, etc.; at least one hollow inner tube housed inside the outer shell and also linked to an inlet and an outlet for a product fluid, i.e., fluid to be heated or cooled; an elongated rotary rod arranged inside the at least one inner tube and having cleaning means for cleaning the inner wall of the at least one inner tube. In this context, "head losses" must be understood as losses generated by friction of the actual inner walls of the tubes.
  • Therefore, the heat exchange unit described herein stands out fundamentally because it additionally comprises: scraping elements linked to the rotary rod and suitable for scraping and detaching the product fluid accumulated or fixed on the inner wall of the at least one inner tube; and an endless spiral also linked to the rotary rod, dimensionally suitable for running along and surrounding the rod longitudinally through the spaces existing between the scraping elements, said endless spiral being suitable for displacement of the product fluid circulating through the at least one inner tube, generating a self-pumping effect.
  • The scraping elements preferably have an elongated planar configuration, thus allowing covering the entire the inner surface of the inner tubes, increasing cleaning efficiency.
  • According to the invention the heat exchange unit comprises three inner tubes. So by means of varying the rotational speed of the rods existing in the inner tubes, and therefore of the endless spiral, it is possible to achieve different pumping flow rates for the product fluid circulating through said inner tubes, which allows improving the heat transfer coefficient and reducing the head losses generated by friction of the actual inner walls of the tubes.
  • On the other hand, in relation to the drive of the rotational movement of each of the rotary rods, the arrangement of a geared motor connected through a central shaft with a main gear to which secondary gears connected with the ends of each of the rotary rods are linked, has been envisaged. Integral movement and synchronized rotation of the rods are thus achieved. The aforementioned main gear is also preferably made of stainless steel, whereas the secondary gears are manufactured from a plastic material, thus preventing the irritating noises produced by the transmissions of the gears, while at the same time said secondary gears are a fuse element as a means for protecting against surge currents.
  • Finally, it must be pointed out that the heat exchange unit herein described has been envisaged to be applicable in the food sector, health sector, environmental sector or industrial sector. It can be also used as a regenerative unit, i.e., using one and the same product fluid in both parts of the unit, namely, the shell and the inner tubes, thus recovering the actual energy of the product fluid.
  • Therefore, the present invention provides a heat exchange unit according to claim 1 which, in addition to efficiently removing residues from the inner wall of the tubes, reducing head loss and substantially improving the heat transfer coefficient, also stands out for obtaining a "self-pumping effect" of the product fluid circulating through said inner tubes, which makes it possible for the requirements of the outer pump to be lower, even to the extent of being able to dispense with said outer pump in some cases, being a more efficient, economical and viable alternative solution than the self-cleaning systems of current heat exchangers.
    • Description of the Drawings
  • To complement the description that is being made and for the purpose of aiding to better understand the features of the invention according to a preferred practical embodiment thereof, a set of drawings is attached as an integral part of said description in which the following has been depicted with an illustrative and nonlimiting character:
    • Figure 1 shows a general perspective view of the self-pumping heat exchange unit object of the invention.
    • Figure 2 shows a perspective view of the shell of the exchange unit of the invention, with its inlets and outlets for the service fluid, three inner tubes being seen according to this embodiment.
    • Figure 3 shows a perspective view of one of the rods arranged internally inside each of the three inner tubes of Figure 2.
    • Figure 4 shows a detailed view of the gears for driving each of the rods existing inside the inner tubes.
    Preferred Embodiment of the Invention
  • A preferred embodiment is described below with reference to the aforementioned drawings, without this limiting or reducing the scope of protection of the present invention.
  • Figure 1 shows a general view of the self-pumping heat exchange unit (1) which comprises:
    • an outer shell (10), shown in greater detail in Figure 2, provided with an inlet (11) and an outlet (12) intended for the circulation of a "service" fluid, i.e., a heat carrier fluid;
    • three hollow inner tubes (20) housed inside the outer shell (10) and also linked to an inlet (21) and an outlet (22) for a product fluid, i.e., fluid to be heated or cooled;
    • an elongated rotary rod (30), shown in Figure 3, arranged inside at least one inner tube (20),
    • scraping elements (40) having an elongated planar configuration, also depicted in Figure 3, linked to the rotary rod (30) and suitable for scraping and detaching the product fluid accumulated or fixed on the inner wall of the at least one inner tube (20), and
    • an endless spiral (50) also linked to the rotary rod (30), dimensionally suitable for running along and surrounding the rotary rod (30) longitudinally through the spaces existing between the scraping elements (40), as seen in said Figure 3, said endless spiral (50) being suitable for displacement of the product fluid circulating through the at least one inner tube (20), generating a self-pumping effect.
  • Furthermore, as can be seen in Figure 1, the heat exchange unit (1) additionally comprises a main geared motor (60) connected through a central shaft (70), shown in Figure 4, with a main gear (71) made of stainless steel, the latter is in turn connected with secondary gears (72) which are linked to the ends of each of the rotary rods (30), as shown in Figure 3. Said secondary gears (72), depicted in Figures 3 and 4, are manufactured from a plastic material, such that in addition to acting as a safety fuse element, it allows preventing the irritating noise generally produced by the transmissions of the gears.
  • Said Figure 1 also shows an auxiliary geared motor (80) which is coupled to the main geared motor (60) and which allows separating the heat exchange unit into two blocks when connected with a threaded screw and a nut for a quick, simple and comfortable opening of the heat exchange unit (1), facilitating inspection and/or maintenance tasks by qualified personnel. Finally, it must be pointed out that the unit incorporates a lower frame (90), also shown in Figure 1, making up the base support of the heat exchange unit (1), and which in the present embodiment further comprises an additional telescopic prolongation (91) provided with wheels (92) in the lower portion, thus facilitating its movement and allowing it to take up minimum space.
  • Finally, the improvements and advantages obtained by means of the heat exchange unit of the present invention must be mentioned:
    • A total performance increase as a result of a substantial reduction in head loss through its conduits.
    • Problems derived from high pumping pressures are eliminated due to its self-pumping effect.
    • Possibility of regulating the pumping flow rate of the product fluid according to the needs of each application.
    • "Multipass" possibility of the endless spiral, thus improving the heat transfer coefficient, so the requirements of the pump are lower.
    • Maximizing cleaning of the inner walls of the inner tubes.
    • It allows dispensing with or significantly reducing the needs of a preceding pump since the self-pumping effect is sufficient.
    • It allows quick, comfortable and simple opening/closing of the exchange unit for inspection and/or maintenance tasks.
    • It allows working and operating with different types of low or high viscosity fluids.

Claims (3)

  1. Self-pumping heat exchange unit (1) comprising an outer shell (10) provided with an inlet (11) and an outlet (12) for a heat carrier fluid; three inner tubes (20) housed inside the outer shell (10) and also linked to an inlet (21) and an outlet (22) for a product fluid, that is a fluid to be heated or cooled; an elongated rotary rod (30) arranged inside each inner tube (20) and having cleaning means for cleaning the inner wall of each inner tube (20), the cleaning means comprising:
    - scraping elements (40) linked to the rotary rod (30) and suitable for scraping and detaching the product fluid accumulated or fixed on the inner wall of the inner tube (20),
    - an endless spiral (50) also linked to the rotary rod (30),
    - a main geared motor (60) connected through a central shaft (70) with a main gear (71), in turn connected with the end of each rotary rod (30),
    wherein the endless spiral (50) is dimensionally suitable for running along and surrounding the rotary rod (30) longitudinally through the spaces existing between the scraping elements (40), said endless spiral (50) being suitable for displacement of the product fluid circulating through the respective inner tube (20), generating a self-pumping effect,
    characterized in that the self-pumping heat exchange unit (1) further comprises:
    - an auxiliary geared motor (80) which is coupled to the main geared motor (60), and connected with a threaded screw and a nut for allowing separation of the heat exchange unit into two blocks;
    - a lower frame (90) making up the base support of the heat exchange unit (1), said lower frame (90) comprising an additional telescopic prolongation (91) provided with wheels (92) in the lower portion;
    and wherein the main gear (71) is linked to secondary gears (72) connected with the ends of each of the rotary rods (30), said secondary gears (72) being made of a plastic material.
  2. Self-pumping heat exchange unit (1) according to claim 1, characterized in that the scraping elements (40) have an elongated planar configuration.
  3. Self-pumping heat exchange unit (1) according to claim 1, characterized in that the main gear (71) is made of stainless steel.
EP14382024.9A 2013-01-25 2014-01-27 Self-pumping heat exchange unit Active EP2759796B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201330088A ES2481190B1 (en) 2013-01-25 2013-01-25 Self-pumping heat exchange unit

Publications (3)

Publication Number Publication Date
EP2759796A2 EP2759796A2 (en) 2014-07-30
EP2759796A3 EP2759796A3 (en) 2015-05-27
EP2759796B1 true EP2759796B1 (en) 2019-06-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14382024.9A Active EP2759796B1 (en) 2013-01-25 2014-01-27 Self-pumping heat exchange unit

Country Status (4)

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US (1) US20140209274A1 (en)
EP (1) EP2759796B1 (en)
ES (2) ES2481190B1 (en)
PT (1) PT2759796T (en)

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US20170367370A1 (en) * 2014-12-23 2017-12-28 Carrier Corporation Freezing Cylinder Beater
CN106736328B (en) * 2016-11-30 2021-02-09 重庆渝青机械配件制造有限公司 Processing technology of multi-ligament spoiler
AT519546B1 (en) * 2017-04-12 2018-08-15 Brandstetter Johann heat exchangers
NL2024720B1 (en) 2020-01-21 2021-09-09 Ireliemar B V Heat exchanger and use of heat exchanger

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FR2224728A1 (en) * 1973-04-09 1974-10-31 Rouchy Christian Spirally wound scraper rod - for automatic internal cleaning of heat exchanger tubes
US3848289A (en) * 1973-04-16 1974-11-19 Chemetron Corp Scraper blade
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Also Published As

Publication number Publication date
US20140209274A1 (en) 2014-07-31
ES2735632T3 (en) 2019-12-19
EP2759796A2 (en) 2014-07-30
ES2481190A1 (en) 2014-07-29
EP2759796A3 (en) 2015-05-27
PT2759796T (en) 2019-07-25
ES2481190B1 (en) 2015-01-16

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