Patent Application
20200300562
The present disclosure relates to a heat exchanger, particularly, the present disclosure relates to a heat exchanger tank assembly for the heat exchanger.
Conventional heat exchanger generally includes a pair of spaced apart headers, formed on end portions of a heat exchanger core configured of a plurality of heat exchange elements such as for example, plates and tubes, and a plurality of fin elements lodged between the adjacent heat exchanger elements. The heat exchange elements connect the headers and configure adjacent yet separated spaces between the headers for facilitating heat exchange between heat exchanging fluids flowing through the respective separated spaces. The heat exchanger further includes a pair of heat exchanger tanks, hereinafter referred to as tanks, wherein each tank is crimped to a corresponding header for configuring a sealed connection there between for forming a header-tank assembly. The headers facilitate fluid communication of heat exchange fluid received in the corresponding tanks and the heat exchanger elements. The tanks are capable of receiving heat exchanging fluid, often pressurized heat exchanging fluid at regular time intervals and as such are subjected to cyclic loading. The headers distribute the heat exchange fluid received in the corresponding tanks to the heat exchanger elements. The tank is generally of reinforced plastic material, such as for example, PA 66, GF 30-40 or PPA GF 45% in case the tank is required to be formed of stronger material, for example in case the tank is for a water Charge Air Cooler. In absence of any pressure relief features, the cyclic loads acting on the tank may cause top walls and side walls of the tank to budge outward, resulting in stresses on tank foot regions or crimped portions of the tank as well as the header channels receiving the tank foot regions, thereby resulting in failures, such as for example, lateral un-crimping between the tank and the corresponding header and formation of groove cracks on the header. Such problems are aggravated if the tanks are wider such as those used in Charge Air Coolers (CACs), wherein large inside surface area of the tanks cause a substantial upward and outward movement of the walls of the tanks that further increases the stresses on the crimped portions thereof, thereby resulting in failures. Such failures may cause leakage of heat exchange fluid from the tank, such as for example, air mixture in case the heat exchanger is water Charge Air Cooler (CAC), water-glycol mixture in case the heat exchanger is a radiator and refrigerant in case the heat exchanger is an evaporator or a condenser. The continuous leakage of the heat exchange fluid from the tank may result in problems such as pressure loss inside the tank, the tank requiring frequent refilling and inefficient operation of the heat exchanger due to insufficient heat exchange fluid in the heat exchange circuit. In case leakage of the heat exchange fluid is left unattended and unchecked, the level of heat exchange fluid may drop below critical levels that may in turn cause complications such as complete breakdown of associated critical elements that may fail due to non-performance of the heat exchanger. For example, in case the heat exchanger is a Charge Air Cooler, the inefficient or non-performance of Charge Air Cooler may adversely impact the performance and efficiency of the engine, in case the heat exchanger is a radiator, the dropping of heat exchange fluid levels below critical level may render the radiator inefficient in removing heat from the engine, thereby resulting in engine seizure due to excessive heat. Further, the cyclic loads acting on the tank may cause vertical deformation of the tank and may also cause shearing stresses at the tank foot regions. As the tank is crimped to the corresponding header that is integrally formed on either one of the end portions of a heat exchanger core, structural failure of the tank may require replacement of the entire heat exchanger instead of replacement of the tank alone. As such failure of the tank is a critical issue and high expenses are involved in addressing tank failures. Few of the prior art discloses arrangement for addressing stress and deformation issues at the tank foot regions and the header channels receiving the tank foot regions. However, none of the prior art discloses any solution for preventing vertical deformation of the tank.
Accordingly, there is a need for a tank assembly that enables the tank to withstand cyclic pressures acting on the internal walls of the tank and that prevents vertical deformation and outward bulging or deformation of the tank, shearing stresses at the tank foot regions and other stresses at the tank foot regions as well as the header channels receiving the tank foot regions that cause failure of the tank and other issues. Further, there is a need for a tank assembly that exhibits improved pressure cycle resistance, burst test resistance, vibration resistance. Further, there is a need for a tank assembly that can withstand high operational pressures, is durable and exhibits improved service life and is convenient to manufacture.
An object of the present invention is to provide a tank assembly that not only holds and urges foot regions of a tank against the header but also holds and urges top portions of the tank against the header, thereby ultimately reducing vertical deformation of the tank, shear stresses and other stresses at tank foot regions and the header channels receiving the tank foot regions.
Another object of the present invention is to provide a tank assembly that obviates the drawbacks associated with vertical deformation and lateral or outward deformation of the tank.
Still another object of the present invention is to provide a tank assembly that exhibits improved pressure cycle resistance, burst test resistance, vibration resistance.
Another object of the present invention is to provide a tank assembly that can withstand high operational pressures, is durable and exhibits improved service life and is convenient to manufacture.
Still another object of the present invention is to provide a tank assembly that is simple in construction and use.
Yet another object of the present invention is to provide a tank assembly that prevents structural failures in the tank, thereby eliminating leakage of heat exchange fluid that can be either air or coolant, from the tank caused due to structural failures.
In the present description, some elements or parameters may be indexed, such as a first element and a second element. In this case, unless stated otherwise, this indexation is only meant to differentiate and name elements which are similar but not identical. No idea of priority should be inferred from such indexation, as these terms may be switched without betraying the invention. Additionally, this indexation does not imply any order in mounting or use of the elements of the invention.
A tank assembly is disclosed in accordance with an embodiment of the present invention. The tank assembly includes a heat exchanger tank and at least one side plate. Each heat exchanger tank includes a pair of foot portions and a pair of top portions. The foot portions are crimped to a corresponding header of a heat exchanger core. The top portions are configured with first engagement elements. The at least one side plates is disposed on at least one side of the heat exchanger core and is configured with second engagement elements. The second engagement elements engage with the corresponding first engagement elements to urge the heat exchanger tank towards the header.
Generally, the foot portions are received in corresponding header channels.
Particularly, the engagement between the first engagement elements and the second engagement elements prevent vertical deformation of the heat exchanger tanks and reduce stresses on the foot portions and header channels.
Specifically, the first engagement elements are integrally formed on the top portions and are extending sideways and outwardly there from.
Alternatively, the first engagement elements are securely mounted on the top portions and are extending sideways and outwardly there from.
Specifically, the first engagement elements are snap fit engagement elements that configure snap fit engagement with corresponding complimentary second engagement elements.
Particularly, the first engagement elements are of a material exhibiting spring properties, wherein the material is selected from a group consisting of metals, plastics and composites.
In accordance with one embodiment of the present invention, the first engagement elements are in the form of pockets formed on the top portions.
In accordance with an embodiment of the present invention, at least a portion of the at least one side plate extends above the headers and the second engagement elements configured thereon engage with the first engagement elements configured on the top portions.
In accordance with an alternate embodiment of the present invention, the first engagement elements extend at least till the headers to engage with the corresponding second engagement elements configured on portion of the at least one side plate.
Preferably, the second engagement elements are in the form of apertures formed on the at least one side plate and that engageably receive the snap fit engagement elements.
Alternatively, the second engagement elements are snap fit engagement elements that extend inwardly from the at least one side plates and configure snap fit engagement with the pockets fouled on the top portions.
Typically, the second engagement elements are of a material exhibiting spring properties, wherein the material is selected from a group consisting of metals, plastics and composites.
In accordance with an embodiment of the present invention, the first and second engagement elements are first holed flanges configured on the top portions and second holed flanges configured on the at least one side plate respectively, the first holed flanges and the second holed flanges are held together by nut and bolt arrangement.
Other characteristics, details and advantages of the invention can be inferred from the description of the invention hereunder. A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying figures, wherein:
It must be noted that the figures disclose the invention in a detailed enough way to be implemented, said figures helping to better define the invention if needs be. The invention should however not be limited to the embodiment disclosed in the description.
A tank assembly of the present invention not only holds and urges foot regions of a tank against the header but also holds and urges top portions of the tank against the header to reduce vertical deformation of the heat exchanger tanks and stresses at tank foot portions and the header channels receiving the tank foot portions. Although, as per the disclosures made in the present specification, the heat exchanger tank assembly is used in vehicle heat exchangers such as Charger Air Coolers (CAC), radiators, condensers, evaporators. However, the tank assembly of the present invention is also applicable for use in other systems and is not limited for use in vehicle heat exchangers only. Particularly, such tank assembly of the present invention is also applicable in any other systems or applications in which the tank assembly is required to hold liquid, particularly, high pressure fluid and withstand cyclic pressures.
The heat exchanger tank assembly 100a includes the heat exchanger tank 10a and at least one side plate 30a. Referring to
The side plates 30a form part of heat exchanger housing that receives therein the heat exchanger core 30. Particularly, the side plates 30a are disposed at opposite sides of the heat exchanger core 30. At least a portion of at least one or preferably, each of the side plates 30a extend above and beyond the headers 20a and is configured with second engagement elements 32a that engage with corresponding first engagement elements 16a to urge the heat exchanger tank 10a, particularly, the top portions 14a of the respective heat exchanger tank 10a towards the corresponding headers 20a, thereby preventing vertical deformation of the heat exchanger tanks 10a and also reducing stresses on the foot portions 12a, 12b and header channels 22a receiving and crimping the foot portions 12a. The second engagement elements 32a is of a material exhibiting spring properties and is selected from a group consisting of metals, plastics and composites. With such configuration, the heat exchanger tank 10a is urged and securely held against the header 20a, the vertical deformation and outward bulging or deformation of the heat exchanger tank 10a is prevented, shearing stresses at the tank foot portions 12a and other stresses at the tank foot portions 12a as well as the header channels 22a receiving the tank foot portions 12a is also prevented. Accordingly, service life and reliability of the heat exchanger tank assembly 100a is improved and the heat exchanger tank assembly 100a exhibits improved pressure cycle resistance, burst test resistance, vibration resistance. Further, with such configuration, the heat exchanger tank assembly 100a is able to withstand high operational pressures and is durable.
However, the present invention is not limited to any particular configuration, number, placement and material of the first engagement elements 16a configured on the top portions 14a of the respective heat exchanger tanks 10a, 10b and the complimentary second engagement elements 32a formed on the at least one side plate 30a or preferably both side plates 30a disposed on opposite sides of the heat exchanger core 30 as far as these are capable of configuring snap fit engagement there-between for urging and securely holding the heat exchanger tank 10a towards the header 20a, thereby preventing vertical deformation of the heat exchanger tanks 10a and also reducing stresses on the foot portions 12a and the header channels 22a receiving and crimping the foot portions 12a.
A similar heat exchanger tank assembly 100b, referred to as the second tank assembly 100b is configured at opposite end portion of the heat exchanger core 30, wherein a second header 20b is crimped on a corresponding second heat exchanger tank 10b, particularly, foot portions 12b of the second heat exchanger tank 10b similar to the way in which the first header 20a is crimped to the first heat exchanger tank 10a, particularly, the foot portions 12a of the first heat exchanger tank 10a. Also, first engagement elements 16b configured on top portions 14b of the second heat exchanger tank 10b engage with corresponding second engagement elements 32b configured on the at least one side plate 30a or preferably both the side plates 30a disposed on opposite sides of the heat exchanger core 30 similar to the manner in which the first engagement elements 16a configured on the top portions 14a of the first heat exchanger tank 10a engage with the corresponding second engagement elements 32a configured on the at least one side plate 30a or preferably both the side plates 30a disposed on opposite sides of the heat exchanger core 30 for urging and securely holding the second heat exchanger tank 10b against the second header 20b. Further, corresponding to the first and second holed flanges 216a and 232a formed on the top portion 14a of the heat exchanger tank 10a and the side plate 30a respectively there are first and second holed flanges 216b and 232b formed on the top portion 14b of the heat exchanger tank 10b and the side plate 30a respectively. The second holed flanges 216b and 232b are held together by nut 218b and bolt 219b arrangement. Further, corresponding to the first engagement elements 116a and the second engagement elements 132a, there are corresponding first and second engagement elements 116b and 132b. The details regarding such engagement between the first engagement elements 16b and the second engagement elements 32b and different possible variations of such engagement are not elaborately disclosed in the present document for the sake of brevity of the present document.
Several modifications and improvement might be applied by the person skilled in the art to the tank assembly as defined above, as long as the heat exchanger tank assembly comprises a heat exchanger tank and at least a pair of side plates. Each heat exchanger tank includes at least a pair of foot portions and at least a pair of top portions. The foot portions are crimped to corresponding headers of a heat exchanger core. The top portions are configured with first engagement elements. The at least one pair of side plates is disposed on at least one side of the heat exchanger core and is configured with second engagement elements. The second engagement elements engage with the corresponding first engagement elements to urge the heat exchanger tank towards the header, thereby preventing vertical deformation of the heat exchanger tanks and also reducing stresses on the foot portions and header channels receiving and crimping the foot portions.
Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that the invention may be practiced otherwise than as specifically described herein.
In any case, the invention cannot and should not be limited to the embodiments specifically described in this document, as other embodiments might exist. The invention shall spread to any equivalent means and any technically operating combination of means.
