Diesel generator set and finned electric heater thereof

Abstract

The utility model discloses a fin formula electric heater, including support and the several heating element of arrangement in support, and the support includes the benchmark mounting plate and the positioning mounting plate of vertical extension and along the horizontal direction symmetrical arrangement, and heating element includes the alloy heating wire of shell and the location in the shell, and two free ends of shell are inserted with the lead -out stick one -to -one correspondence respectively, and one end of lead -out stick is connected with alloy heating wire, and the other end of lead -out stick is fixedly connected on the benchmark mounting plate, and the shell includes two parallelly arranged straight pipe sections and a "U" shape extension's elbow section, and two positioning holes are penetrated in the positioning mounting plate, and the both ends of elbow section are inserted in the positioning hole one -to -one correspondence respectively and with the positioning hole sliding adaptation, and the one end of straight pipe section is inserted with lead -out stick, and the other end of straight pipe section is connected with the end of elbow section one -to -one correspondence. The utility model discloses still a kind of application above-mentioned fin formula electric heater's diesel generating set.

Description

Technical Field

[0001] This utility model relates to the technical field of electric heating materials for diesel generator sets, and particularly to a finned electric heater. This utility model also relates to a diesel generator set using the finned electric heater. Background Technology

[0002] In the current daily operation of nuclear power plants, finned air heaters are usually installed on the diesel generator sets used in the plant to prevent moisture damage to the internal working conditions of the diesel generator sets.

[0003] Currently available finned electric heaters typically use a single rod-shaped or tubular heating element. This element generally consists of two leads at both ends and an alloy heating wire in the middle, coaxially arranged and connected within a casing. The casing can be filled with mineral insulating material to ensure the element's insulation performance. Multiple finned structures can be arranged on the outside of the casing, and supports are used to reliably install these casings. When this type of finned electric heater is running, the alloy heating wire is energized and heats up, dissipating heat to the external environment through the casing and fins. This aims to dehumidify and prevent moisture in the operating environment of the diesel generator set, ensuring its stable operation.

[0004] However, although the existing finned electric heaters can meet the basic application requirements of diesel generator sets, the alloy heating wires and other components of the finned electric heaters will expand and deform to a certain extent when heated. These expansion and deformations will form stress concentrations in the local area of ​​the heating element, which will not only cause local structural damage to the heating element, but also cause the heating element and even the finned electric heater to malfunction and fail to operate normally, thus adversely affecting the continuous operation of the corresponding diesel generator set.

[0005] In view of this, how to optimize the component structure of finned electric heaters and avoid structural damage to their heating elements due to local deformation and stress concentration, thereby ensuring the stable operation of finned electric heaters and diesel generator sets, is an important technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a finned electric heater whose heating element is less prone to structural damage due to localized deformation and stress concentration, thereby effectively ensuring the stable operation of the finned electric heater and the diesel generator set. Another purpose of this invention is to provide a diesel generator set that utilizes the aforementioned finned electric heater.

[0007] To solve the above-mentioned technical problems, this utility model provides a finned electric heater, including a bracket and a plurality of heating elements arranged on the bracket. The bracket includes a reference mounting plate and a positioning mounting plate that extend vertically and are symmetrically arranged in the horizontal direction.

[0008] The heating element includes a shell and an alloy heating wire located inside the shell. Two free ends of the shell are respectively fitted with lead-out rods. One end of the lead-out rod is connected to the alloy heating wire, and the other end of the lead-out rod is fixedly connected to the reference mounting plate.

[0009] The casing includes two parallel straight pipe sections and a U-shaped bend. The positioning mounting plate has two positioning holes. The two ends of the bend are respectively inserted into the positioning holes and slidably adapted to the positioning holes. One end of the straight pipe section is inserted with the lead-out rod, and the other end of the straight pipe section is connected to the end of the bend.

[0010] Preferably, a U-shaped sleeve is fixedly provided on the positioning mounting plate, and the two ends of the U-shaped sleeve are coaxially aligned and connected with the two positioning holes respectively. The bent pipe section is inserted into the U-shaped sleeve, and the outer wall of the bent pipe section slides in fit with the inner wall of the U-shaped sleeve.

[0011] Preferably, the ends of the U-shaped sleeves are coaxially inserted into the positioning holes one by one, and the outer peripheral wall of the U-shaped sleeves is in close contact with the inner annular wall of the positioning holes.

[0012] Preferably, the U-shaped sleeve is welded and fixed to the positioning and mounting plate.

[0013] Preferably, the alloy heating wire includes a heating section located within the straight pipe section and an extension section located within the bent pipe section. The heating section extends spirally along the axial direction of the straight pipe section, and the extension direction of the extension section is consistent with the extension direction of the bent pipe section.

[0014] Preferably, the alloy heating wire is an integral structural component.

[0015] Preferably, a port flange is fixedly provided on the reference mounting plate, and the lead-out rod is detachably connected to the port flange by a fastening nut.

[0016] Preferably, the shell is an integral structural component.

[0017] Preferably, the bottom of the reference mounting plate and the positioning mounting plate are respectively connected to horizontally extending mounting base plates. An adjustment hole is passed through the mounting base plate. The adjustment hole is an oblong hole, and the long axis direction of the adjustment hole is parallel to the axial direction of the straight pipe section. An adjustment bolt is inserted into the adjustment hole in the vertical direction. The adjustment bolt can slide and engage with the adjustment hole by reciprocating along the long axis direction of the adjustment hole.

[0018] This utility model also provides a diesel generator set, including a diesel generator and a finned electric heater, wherein the finned electric heater is the finned electric heater as described in any of the above claims.

[0019] Compared with the above-mentioned background technology, the finned electric heater provided by this utility model has the following installation arrangement: one end of the heating element lead rod is fixedly installed on the reference mounting plate, and the other end of the bent tube section is slidably inserted into the positioning hole to complete the reliable installation between the heating element and the positioning mounting plate. In this way, based on the double plate support structure formed by the symmetrical arrangement of the reference mounting plate and the positioning mounting plate, the heating element has a component adaptation structure with one end fixedly connected and the other end slidably installed. When the equipment is in actual operation, if the heating element causes localized expansion or deformation of the main structural components such as the shell due to heat generated by electricity, the deformed components of the heating element, such as the shell, will extend along the length direction. At this time, due to the sliding insertion fit between the bend section and the positioning hole, each deformed component of the heating element can extend freely to deform appropriately without jamming or abutting against the positioning mounting plate at the bend section. This effectively avoids local stress concentration caused by the inability of the heating element's shell and other structural components to relax due to heat deformation, thus effectively preventing damage to the shell and other components caused by local stress concentration after heat deformation. This effectively ensures the structural reliability and working condition tolerance of the heating element, and makes the operation of the finned electric heater safer and more reliable, and the overall operation of the diesel generator set is also safer and more stable.

[0020] In another preferred embodiment of this utility model, a U-shaped sleeve is fixedly provided on the positioning mounting plate, and the two ends of the U-shaped sleeve are coaxially aligned and connected with the two positioning holes respectively. The bent pipe section is inserted into the U-shaped sleeve, and the outer wall of the bent pipe section slides in fit with the inner wall of the U-shaped sleeve. The U-shaped sleeve provides ample structural protection for the bent section. Simultaneously, the outer diameter of the bent section inserted into the U-shaped sleeve is significantly smaller than the inner diameter of the sleeve, ensuring sufficient radial clearance between the bent section and the U-shaped sleeve. This allows the bent section to move moderately within the U-shaped sleeve's cavity when the heating element deforms due to heat, providing sufficient extension space and proper structural guidance for the overall thermal deformation of the bent section and the heating element. This prevents rigid contact or misalignment at the mounting plate, further avoiding localized stress concentration at the bent section and thus eliminating stress-induced damage. This further ensures the reliability of the heating element and makes the overall operation of the finned electric heater more stable and safe. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 An isometric view of the assembly structure of a finned electric heater according to a specific embodiment of this utility model;

[0023] Figure 2 for Figure 1 A perspective view of the axially unfolded structure of the heating element.

[0024] in:

[0025] 111-Reference mounting plate; 112-Positioning mounting plate; 113-Positioning hole; 114-Port flange; 115-Fastening nut; 116-Mounting base plate; 117-Adjustment hole;

[0026] 12-Heating element; 121-Fin; 122-Lead rod;

[0027] 13-Pipe shell; 131-Straight pipe section; 132-Bend pipe section;

[0028] 14 - Alloy heating wire; 141 - Heating section; 142 - Extension section;

[0029] 15-U-shaped sleeve. Detailed Implementation

[0030] The core of this utility model is to provide a finned electric heater, whose heating element is not easily damaged by local deformation and stress concentration, thereby effectively ensuring the stable operation of the finned electric heater and the diesel generator set; in addition, a diesel generator set using the above-mentioned finned electric heater is also provided.

[0031] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In specific implementation methods, in conjunction with references Figure 1 and Figure 2 As shown, it should be noted that, as Figure 2 The heating element 12 shown is a perspective view of the structure after the heating element 12 is extended along the axial direction. However, in the actual assembly and application of this solution, as shown... Figure 2 The extension section 142 shown is to be bent for assembly, not... Figure 2 The straight line extension state shown. Therefore, for Figure 2 The component combinations shown should be understood in light of the differences in actual assembly and application, and will not be elaborated further below.

[0033] The finned 121 type electric heater provided by this utility model includes a bracket and a plurality of heating elements 12 arranged on the bracket. The bracket includes a reference mounting plate 111 that extends vertically and is symmetrically arranged in the horizontal direction and a positioning mounting plate 112.

[0034] The heating element 12 includes a housing 13 and an alloy heating wire 14 located inside the housing 13. Several fins 121 are arranged along the axial direction on the outside of the housing 13 to assist in heat conduction. Lead-out rods 122 are respectively inserted into the two free ends of the housing 13. One end of the lead-out rod 122 is connected to the alloy heating wire 14, and the other end of the lead-out rod 122 is fixedly connected to the reference mounting plate 111.

[0035] The casing 13 includes two parallel straight pipe sections 131 and a U-shaped bend 132. The bend 132 connects the two straight pipe sections 131. Two positioning holes 113 are through the positioning mounting plate 112. The two ends of the bend 132 are respectively inserted into the positioning holes 113 and slidably adapted to the positioning holes 113. One end of the straight pipe section 131 is inserted with a lead-out rod 122, and the other end of the straight pipe section 131 is connected to the end of the bend 132.

[0036] During the assembly of the finned electric heater 121, one end of the heating element 12 with its lead rod 122 is fixedly mounted on the reference mounting plate 111, and the other end with the bent tube section 132 is slidably inserted into the positioning hole 113, thus completing the reliable installation between the heating element 12 and the positioning mounting plate 112. In this way, based on the double-plate support structure formed by the symmetrical arrangement of the reference mounting plate 111 and the positioning mounting plate 112, the heating element 12 has an assembly adaptation structure with one end fixedly connected and the other end slidably mounted. When the equipment is in actual operation, if the heating element 12 causes localized expansion or deformation of the main structural components such as the shell 13 due to heat generated by electricity, the deformed components of the heating element 12, such as the shell 13, will extend along the length direction. At this time, due to the sliding insertion fit between the bent section 132 and the positioning hole 113, each deformed component of the heating element 12 can extend freely to deform appropriately, without getting stuck or abutting against the positioning mounting plate 112 at the bent section 132. This effectively avoids localized stress concentration caused by the inability of the shell 13 and other structural components of the heating element 12 to relax due to heat deformation. This effectively prevents damage to the shell 13 and other components caused by localized stress concentration after heat deformation, effectively ensuring the structural reliability and working condition tolerance of the heating element 12, and making the operation of the finned electric heater 121 safer and more reliable. The overall operation of the diesel generator set is also safer and more stable.

[0037] It is easy to see that one end of the heating element 12 is fixedly connected to the reference mounting plate 111 as the fixed end of the heating element 12; while the other end of the heating element 12 is slidably inserted into the positioning hole 113. Correspondingly, due to the bending structure of the bent pipe section 132 itself, the inner arc outer wall of the bent pipe section 132 can abut against the positioning mounting plate 112 structure located between the two positioning holes 113 when necessary, thereby preventing the sliding end of the heating element 12 from coming off the positioning mounting plate 112, thus forming a limited installation of the sliding end of the heating element 12. In this way, the reliable assembly of both ends of the heating element 12 is achieved, ensuring that the basic assembly position of the heating element 12 is constant, and preventing the heating element 12 from becoming loose or misaligned during equipment operation.

[0038] Specifically, a U-shaped sleeve 15 is fixedly installed on the positioning mounting plate 112. The two ends of the U-shaped sleeve 15 are coaxially aligned and connected with the two positioning holes 113 respectively. The bent pipe section 132 is inserted into the U-shaped sleeve 15, and the outer wall of the bent pipe section 132 slides with the inner wall of the U-shaped sleeve 15. The U-shaped sleeve 15 provides sufficient structural protection for the bent section 132. Simultaneously, the outer diameter of the bent section 132, inserted into the U-shaped sleeve 15, is significantly smaller than the inner diameter of the U-shaped sleeve 15. This ensures sufficient radial clearance between the bent section 132 and the U-shaped sleeve 15, allowing the bent section 132 to move moderately within the inner cavity of the U-shaped sleeve 15 when the heating element 12 deforms and extends due to heat. This provides ample space for the overall thermal deformation of the bent section 132 and the heating element 12, and provides appropriate structural guidance, preventing rigid contact or misalignment of the bent section 132 at the fitting point of the positioning mounting plate 112. This further avoids localized stress concentration at the bent section 132, thus preventing stress-induced damage and ensuring the reliability of the heating element 12. It also makes the overall operation of the finned electric heater 121 more stable and safe.

[0039] More specifically, the ends of the U-shaped sleeves 15 are coaxially inserted into the positioning holes 113 one by one, and the outer peripheral wall of the U-shaped sleeves 15 is tightly fitted with the inner annular wall of the positioning holes 113. The alignment and insertion connection between the ends of the U-shaped sleeves 15 and the positioning holes 113, combined with the tight fit between the outer peripheral wall of the U-shaped sleeves 15 and the inner annular wall of the positioning holes 113, can effectively ensure the alignment accuracy between the ends of the U-shaped sleeves 15 and the positioning holes 113. This ensures that the bent section 132 can be smoothly inserted into the U-shaped sleeves 15 while passing through the positioning holes 113, avoiding rigid contact or sliding resistance of the bent section 132 at the junction of the positioning holes 113 and the U-shaped sleeves 15. This ensures that when the heating element 12 is deformed by heat, the bent section 132 can smoothly extend or retract moderately in the U-shaped sleeves 15, thereby further preventing structural damage to the bent section 132 during deformation.

[0040] It is easy to understand that, in practical applications, the shell 13 of the heating element 12 used in this solution is preferably made of soft material. In particular, the bent section 132 should have a certain flexible bending deformation capability so that it can be smoothly inserted into the U-shaped sleeve 15 and flexibly passed out, ensuring accurate alignment and reliable assembly of the bent section 132, the U-shaped sleeve 15, and the positioning hole 113.

[0041] Based on this, the U-shaped sleeve 15 is welded and fixed to the positioning mounting plate 112. Generally, the outer wall of the U-shaped sleeve 15 can be directly welded to the fitting part of the positioning hole 113 with a circumferential weld to obtain the best welded connection strength. Alternatively, multiple circumferentially distributed weld points can be arranged near the outer wall of the U-shaped sleeve 15 and the positioning hole 113 to spot weld and fix the outer wall of the U-shaped sleeve 15 to the main structure of the positioning mounting plate 112. In practical applications, workers can flexibly select and adjust the connection method between the U-shaped sleeve 15 and the main structure of the positioning mounting plate 112 according to the specific working conditions and process difficulty. In principle, any method that can ensure the reliable installation of the U-shaped sleeve 15 is acceptable.

[0042] On the other hand, the alloy heating wire 14 includes a heating section 141 located in the straight pipe section 131 and an extension section 142 located in the bent pipe section 132. The heating section 141 extends spirally along the axial direction of the straight pipe section 131, and the extension direction of the extension section 142 is consistent with the extension direction of the bent pipe section 132. The heating section 141, as the main heating part of the alloy heating wire 14, has a spiral extension structure that helps increase the axial heat generation per unit area of ​​the straight pipe section 131, thereby ensuring the heating performance of the finned electric heater 121. The fins 121 are aligned with the outer wall of the straight pipe section 131 to optimize the heat dissipation effect of the fins 121 and the heating section 141, improve the heat conduction efficiency of the effective heating part of the heating element 12, and ensure the corresponding dehumidification and moisture-proof treatment effect of the generator. The extension section 142 is a single heating wire with a unidirectional extension structure. It only needs to ensure that its bending extension direction is consistent with that of the bent pipe section 132, thereby reducing the heat generation at the extension section 142 and making the heating wire structure at the extension section 142 thinner and more flexible so that the extension section 142 can be bent more easily, thereby fully matching the bending angle and extension structure at the bent pipe section 132, ensuring the component adaptation effect and assembly reliability of the heating element 12.

[0043] Of course, considering the actual process selection and component application effect, the alloy heating wire 14 is an integral structural component to ensure the connection strength between the heating section 141 and the extension section 142, improve the overall structural reliability of the alloy heating wire 14, and ensure that the alloy heating wire 14 can adapt to the high-intensity continuous operation requirements of the equipment.

[0044] In addition, a port flange 114 is fixedly installed on the reference mounting plate 111, and the lead-out rod 122 is detachably connected to the port flange 114 via a fastening nut 115. The port flange 114 optimizes the assembly stress distribution between the end of the heating element 12 and the reference mounting plate 111, making its assembly connection more stable and reliable. The fastening nut 115, as an auxiliary connecting part, enables reliable connection and flexible disassembly and assembly between the lead-out rod 122 and the port flange 114, so that when necessary, the end of the heating element 12 where the lead-out rod 122 is located can be removed from the reference mounting plate 111, facilitating the inspection, maintenance, and replacement of components such as the heating element 12.

[0045] Furthermore, the shell 13 is an integral structural component, which can ensure the overall structural strength of the shell 13 and optimize its structural protection effect on internal components such as the alloy heating wire 14. This further improves the assembly strength and working condition tolerance of the heating element 12, and makes the overall assembly of the finned electric heater 121 more durable.

[0046] In addition, the bottom of the reference mounting plate 111 and the positioning mounting plate 112 are respectively connected to horizontally extended mounting base plates 116. An adjustment hole 117 is passed through the mounting base plate 116. The adjustment hole 117 is an oblong hole, and the long axis direction of the adjustment hole 117 is parallel to the axis of the straight pipe section 131. An adjustment bolt is inserted into the adjustment hole 117 in the vertical direction. The adjustment bolt can slide and engage with the adjustment hole 117 by reciprocating along the long axis direction of the adjustment hole 117.

[0047] During equipment assembly and connection, the mounting base plate 116 is reliably connected to the matching mounting surface or frame of the diesel generator set using the adjusting bolts inserted through the adjusting hole 117. With the adjusting bolts loosened to a certain extent, the relative position of the adjusting hole 117 and the adjusting bolts can be adjusted by reciprocating the mounting base plate 116. This aims to adjust the spacing between the mounting base plates 116 of the reference mounting plate 111 and the positioning mounting plate 112, thereby achieving the linkage adjustment of the spacing between the reference mounting plate 111 and the positioning mounting plate 112. This allows for the adaptation to the assembly and arrangement requirements of heating elements 12 of different sizes, making the finned electric heater more adaptable to various operating conditions and more convenient to use.

[0048] In a specific embodiment, the diesel generator set provided by this utility model includes a diesel generator and a finned electric heater, wherein the finned electric heater is as described above. The heating element of the finned electric heater of this diesel generator set is not easily damaged by local deformation and stress concentration, thereby effectively ensuring the stable operation of the finned electric heater and the diesel generator set.

[0049] In summary, the finned electric heater provided in this utility model is installed by fixing one end of the heating element lead rod to the reference mounting plate and sliding the other end of the bent tube section into the positioning hole to complete the reliable installation between the heating element and the positioning mounting plate. In this way, based on the double-plate support structure formed by the symmetrical arrangement of the reference mounting plate and the positioning mounting plate, the heating element has a component adaptation structure with one end fixedly connected and the other end slidingly installed. When the equipment is in actual operation, if the heating element causes localized expansion or deformation of the main structural components such as the shell due to heat generated by electricity, the deformed components of the heating element, such as the shell, will extend along the length direction. At this time, due to the sliding insertion fit between the bend section and the positioning hole, each deformed component of the heating element can extend freely to deform appropriately without jamming or abutting against the positioning mounting plate at the bend section. This effectively avoids local stress concentration caused by the inability of the heating element's shell and other structural components to relax due to heat deformation, thus effectively preventing damage to the shell and other components caused by local stress concentration after heat deformation. This effectively ensures the structural reliability and working condition tolerance of the heating element, and makes the operation of the finned electric heater safer and more reliable, and the overall operation of the diesel generator set is also safer and more stable.

[0050] This utility model also provides a diesel generator set, in which the heating element of the finned electric heater is not easily damaged by local deformation and stress concentration, thereby effectively ensuring the stable operation of the finned electric heater and the diesel generator set.

[0051] The finned electric heater and the diesel generator set using the finned electric heater provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A finned electric heater, comprising a support frame and a plurality of heating elements arranged on the support frame, characterized in that, The bracket includes a reference mounting plate and a positioning mounting plate that extend vertically and are symmetrically arranged in the horizontal direction; The heating element includes a shell and an alloy heating wire located inside the shell. Two free ends of the shell are respectively fitted with lead-out rods. One end of the lead-out rod is connected to the alloy heating wire, and the other end of the lead-out rod is fixedly connected to the reference mounting plate. The tube shell includes two parallel straight pipe sections and a U-shaped extended bend pipe section. The positioning mounting plate has two positioning holes. The two ends of the bend pipe section are respectively inserted into the positioning holes and slidably adapted to the positioning holes. One end of the straight pipe section is inserted with the lead-out rod, and the other end of the straight pipe section is connected to the end of the bend pipe section.

2. The finned electric heater as described in claim 1, characterized in that, A U-shaped sleeve is fixedly installed on the positioning mounting plate. The two ends of the U-shaped sleeve are coaxially aligned and connected with the two positioning holes respectively. The bent pipe section is inserted into the U-shaped sleeve, and the outer wall of the bent pipe section slides in fit with the inner wall of the U-shaped sleeve.

3. The finned electric heater as described in claim 2, characterized in that, The ends of the U-shaped sleeves are coaxially inserted into the positioning holes one by one, and the outer peripheral wall of the U-shaped sleeves is tightly fitted with the inner annular wall of the positioning holes.

4. The finned electric heater as described in claim 3, characterized in that, The U-shaped sleeve is welded and fixed to the positioning and mounting plate.

5. The finned electric heater as described in claim 1, characterized in that, The alloy heating wire includes a heating section located within the straight pipe section and an extension section located within the bent pipe section. The heating section extends spirally along the axial direction of the straight pipe section, and the extension direction of the extension section is consistent with the extension direction of the bent pipe section.

6. The finned electric heater as described in claim 5, characterized in that, The alloy heating wire is a one-piece structural component.

7. The finned electric heater as described in claim 1, characterized in that, A port flange is fixedly installed on the reference mounting plate, and the lead-out rod is detachably connected to the port flange by fastening nuts.

8. The finned electric heater as described in claim 1, characterized in that, The shell is a one-piece structural component.

9. The finned electric heater as described in claim 1, characterized in that, The bottom of the reference mounting plate and the positioning mounting plate are respectively connected to horizontally extending mounting base plates. An adjustment hole is passed through the mounting base plate. The adjustment hole is an oblong hole, and the long axis of the adjustment hole is parallel to the axis of the straight pipe section. An adjustment bolt is inserted into the adjustment hole in the vertical direction. The adjustment bolt can slide and engage with the adjustment hole by reciprocating along the long axis of the adjustment hole.

10. A diesel generator set, comprising a diesel generator and a finned electric heater, characterized in that, The finned electric heater is the finned electric heater as described in any one of claims 1 to 9.

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