CN211575074U

CN211575074U - Electric heating steam generator for steam boiler

Info

Publication number: CN211575074U
Application number: CN202020124025.3U
Authority: CN
Inventors: 陈熙; 陈钦林
Original assignee: Changshu Ninghe New Energy Technology Co ltd
Current assignee: Changshu Ninghe New Energy Technology Co ltd
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-09-25
Anticipated expiration: 2030-01-20

Abstract

An electric heating steam generator for a steam boiler comprises a furnace shell, wherein the top of the steam boiler is connected with a furnace shell steam leading-out interface in a matching mode, a furnace shell water leading-out interface is arranged on the furnace shell, a furnace shell flange plate is arranged in the center of the bottom of the furnace shell, a heating cylinder abdicating hole is formed in the center of the furnace shell flange plate, the electric heating steam generator comprises a heating cylinder, an electric heating pipe and an electric heating pipe water supply mechanism, the upper end of the heating cylinder extends into a furnace shell cavity from the heating cylinder abdicating hole, the lower end of the heating cylinder is fixed with the furnace shell flange plate, and the lower end of the; the electric heating tube is arranged in the heating tube cavity, the upper end of the electric heating tube is fixed with the top wall of the heating tube, the lower end of the electric heating tube extends downwards to the outside of the heating tube cavity and is fixed with the water supply mechanism of the electric heating tube, the outer wall of the middle part of the electric heating tube is provided with a high-temperature resistant insulating layer, a thick film resistor heating printed circuit and a high-temperature resistant insulating outer protective layer, two ends of the thick film resistor heating printed circuit are respectively welded with a conducting strip, and. The vaporization efficiency is improved; the structure is simplified, and the manufacture is convenient; the use is flexible; the safety is guaranteed.

Description

Electric heating steam generator for steam boiler

Technical Field

The utility model belongs to the technical field of electric heater unit, concretely relates to electric heating steam generator that steam boiler was used.

Background

Hot water or steam is used in such applications as vehicle washing, garment ironing, fabric dyeing and sizing, adhesive application, floor heating, dish sterilization, sauna, winter steam heating, etc. The electric heating steam generator is a core component of a boiler and has the function of heating water into hot water and further forming the hot water into steam, and specifically, the boiler continuously takes away heat absorbed by a heating surface by using the circulating flow of the water in the running process so as to heat and gasify the water into the steam.

The CN209399334U recommends that the 'anhydrous boiler steam generator' makes up the defects of the 'electric steam boiler' introduced in CN208058802U, and the structure of the CN209399334U is as follows: "set up metal water pipe and heating pipe in the casing, still have a metal inner bag of no water in the casing, the metal water pipe is the heliciform and twines on the periphery wall of metal inner bag, the metal heating pipe is the heliciform and twines on the periphery wall of metal inner bag equally, and both crisscross distributions form the clearance, the clearance intussuseption is full of, the one end of metal water pipe stretches out the outer water inlet that forms of casing, the other end stretches into the metal inner bag and forms first gas outlet, the both ends of metal heating pipe all stretch out outside the casing, set up at the top of casing with the communicating second gas outlet of metal inner bag (can specifically see the specification 0006 section and the 0024 section of this patent)". This patent suffers from at least the following disadvantages: firstly, because the metal water pipe and the metal heating pipe are wound on the outer wall of the metal inner container at intervals in a spiral state, the metal heating pipe is electrified to generate heat to heat water in the metal water pipe and generate steam to be led out from the first air outlet to the second air outlet, the heating vaporization efficiency is relatively low; secondly, the metal water pipe and the metal heating pipe are alternately wound outside the metal heating pipe at intervals in a spiral state, so that the structure is complex and the processing is relatively troublesome; thirdly, since this patent does not give any technical connotation of actually being a dry steam boiler, the skilled person is not sufficient to derive therefrom a relevant teaching of being put to practical use, i.e. it is difficult or even impossible to combine the steam generator given in this patent with a boiler (actually an "outer tank", the following). In view of the foregoing, there is a need for reasonable improvements, and the solutions described below are made in this context.

Disclosure of Invention

The task of the utility model is to provide an electric heating steam generator for steam boiler that helps improving the efficiency with water heating and vaporization and can save electric energy consumption, be favorable to showing simplified structure and can make things convenient for, be of value to combine together with the boiler and can become the genuine steam boiler, have to be convenient for guarantee electric safety and can avoid the electric leakage and cause the accident.

The utility model aims to solve the problem that the electric heating steam generator for the steam boiler comprises a furnace shell, wherein the top of the furnace shell is connected with a furnace shell steam leading-out interface for leading out steam in a furnace shell cavity of the furnace shell, the furnace shell is also provided with a furnace shell water leading-out interface for leading water into the furnace shell cavity, a furnace shell flange is formed at the central position of the bottom of the furnace shell, a heating cylinder abdicating hole is formed at the central position of the furnace shell flange, the electric heating steam generator comprises a heating cylinder, an electric heating pipe and an electric heating pipe water supply mechanism, the upper end of the heating cylinder extends into the furnace shell cavity from the heating cylinder abdicating hole, the lower end of the heating cylinder is fixed with the furnace shell flange at the position corresponding to the lower part of the furnace shell flange, and the lower end of the heating cylinder cavity of the heating cylinder is communicated with the outside, wherein, the top wall of the heating cylinder is provided with an electric heating pipe interface matching hole; the electric heating pipe sets up in the heating cylinder intracavity, the upper end of this electric heating pipe is corresponding to the position that electric heating pipe interface joins in marriage the hole is fixed with the heating cylinder roof, the lower extreme downwardly extending of electric heating pipe outside the heating cylinder intracavity with electric heating pipe water supply mechanism is fixed, and electric heating pipe's electric heating lumen with stove outer covering chamber and electric heating pipe water supply mechanism communicate with each other, has combined a high temperature resistant insulating layer, thick film resistance heating printed circuit and high temperature resistant insulating outer jacket from inside to outside in proper order on the outer wall at the middle part of electric heating pipe's direction of height, respectively welds a conducting strip admittedly at the both ends of thick film resistance heating printed circuit, and the welding has the power cord on the conducting strip, this power cord and external power source circuit electrical connection under the user state, electric heating pipe water supply mechanism be connected with the water source tube way under the user state.

In a specific embodiment of the present invention, a safety vent valve and a liquid level gauge are disposed on the top of the furnace shell, a drain port is disposed on one side of the flange of the furnace shell and at the bottom of the furnace shell, and a steam pressure controller interface communicated with the cavity of the furnace shell is disposed on the upper side of the furnace shell.

In another specific embodiment of the present invention, the lower end of the heating cylinder and the position corresponding to the lower side of the furnace shell flange plate are formed with a heating cylinder fixing flange, a heating cylinder fixing flange seal ring is provided between the heating cylinder fixing flange and the furnace shell flange plate, and the heating cylinder fixing flange and the furnace shell flange plate are fixed together by a heating cylinder fixing flange screw and the heating cylinder fixing flange seal ring.

In another specific embodiment of the present invention, a wrench operation part is welded to the upper end of the electric heating pipe, a heating pipe fitting port is extended from a central position of one side of the wrench operation part facing upward, the heating pipe fitting port is fixed to the top wall of the heating cylinder at a position corresponding to the electric heating pipe fitting port, and a seal is formed between an outer wall of the heating pipe fitting port and a hole wall of the electric heating pipe fitting port, and a port portion of one side of the heating pipe fitting port facing upward is configured as the steam outlet of the electric heating pipe.

In another specific embodiment of the present invention, the thick film resistor heating printed circuit is formed by screen printing on a side surface of the high temperature insulation layer opposite to the electric heating tube and covered by the high temperature insulation outer sheath.

In yet another specific embodiment of the present invention, the high temperature insulating layer is a high temperature insulating ceramic layer; the high-temperature-resistant insulating outer protective layer is a transparent high-temperature-resistant insulating ceramic layer or an epoxy resin layer.

In a more specific embodiment of the present invention, the wrench operating member is an outer hexagon nut, and an outer thread is formed on an outer wall of the heating pipe fitting.

In yet another specific embodiment of the present invention, the electric heating pipe water supply mechanism includes an inlet distribution tray and an inlet distribution tray cover, the inlet distribution tray is located below the inlet distribution tray cover, an inlet distribution tray inlet opening is provided at a central position of an inlet distribution tray bottom wall of an inlet distribution tray cavity of the inlet distribution tray, an inlet distribution tray inlet connector is fixed at a position corresponding to the inlet distribution tray inlet opening and at one side of the inlet distribution tray bottom wall facing away from the inlet distribution tray cavity, the inlet distribution tray inlet connector is connected with a water source pipeline in a use state, the inlet distribution tray cover is fixed above the inlet distribution tray in a sealing manner, a lower end of the electric heating pipe is fixed with the inlet distribution tray cover, and the electric heating pipe cavity of the electric heating pipe is communicated with the inlet distribution tray cavity.

In yet another specific embodiment of the present invention, the water inlet flow distribution plate is formed with a water inlet flow distribution plate flange, and flange fixing screws are disposed on the water inlet flow distribution plate flange at intervals, and the flange fixing screws are fixed to the water inlet flow distribution plate cover and are defined by limiting nuts screwed on the flange fixing screws.

In yet another specific embodiment of the present invention, a sealing gasket is disposed between the flange of the inlet distribution plate and the cover of the inlet distribution plate.

The technical scheme provided by the utility model the technical effect lie in: because only the outer wall of the electric heating pipe positioned in the heating cylinder cavity of the heating cylinder is required to be sequentially combined with the high-temperature-resistant insulating layer, the thick-film resistor heating printed circuit and the high-temperature-resistant insulating outer sheath from inside to outside, the thick-film resistor heating printed circuit heats and vaporizes water flowing through the electric heating pipe cavity, the steam is led to the furnace shell cavity of the furnace shell, and the water in the furnace shell cavity is heated and vaporized, so that the vaporization efficiency can be improved, and the electric energy consumption can be saved; because the lower part of the heating cylinder is provided with the heating cylinder fixing flange fixed with the furnace shell flange plate at the bottom of the furnace shell, and because the metal water pipe and the metal heating pipe do not need to be respectively wound and covered outside the water heating vaporization pipe like the prior art, the structure is obviously simplified, and the heating cylinder fixing flange can be conveniently manufactured and can be quickly and conveniently connected with the furnace shell; the heating cylinder, the electric heating pipe and the combination of the water supply mechanism of the electric heating pipe and the furnace shell can be put into practical use, so that the flexible use requirements of occasions such as the car washing industry, garment ironing, adhesive use, floor heating, sauna, cold winter steam heating, floor cleaning and the like can be met; because the electric heating pipe is shielded by the heating cylinder, the safety is ensured, and electric leakage accidents are avoided.

Drawings

Fig. 1 is a structural diagram of an embodiment of the present invention.

Fig. 2 is a detailed structural view of the electric heating pipe shown in fig. 1.

Fig. 3 is a development view of the electric heating pipe shown in fig. 2.

Detailed Description

In order to make the technical essence and advantages of the present invention more clear, the applicant below describes in detail the embodiments, but the description of the embodiments is not a limitation of the present invention, and any equivalent changes made according to the inventive concept, which are only formal and not essential, should be considered as the technical scope of the present invention.

In the following description, any concept that may refer to directionality or orientation such as up, down, left, right, front, and rear is used for the position of the drawings, and thus should not be construed as limiting the technical solution provided by the present invention.

Referring to fig. 1 to 3, a shell 1 of the structural system of the steam boiler is shown in fig. 1, which may also be referred to as a "furnace body" (the same applies hereinafter), a shell steam leading-out port 12 for leading out steam in a shell cavity 11 of the shell 1 is connected to a top of the shell 1, a shell water leading-out port 13 for leading water into the shell cavity 11 is further provided on the shell 1, a shell flange 14 is formed at a central position of a bottom of the shell 1, a cartridge offset hole 141 is formed at a central position of the shell flange 14, a cartridge 2, an electric heating pipe 3 and an electric heating pipe water supply mechanism 4 of the structural system of the electric heating steam generator are shown, an upper end of the cartridge 2 extends from the cartridge offset hole 141 into the shell cavity 11, and a lower end of the cartridge 2 is fixed to the shell flange 14 at a position corresponding to a lower side of the shell 14, the lower end of the heating cylinder cavity 21 of the heating cylinder 2 is communicated with the outside, wherein the heating cylinder top wall 22 of the heating cylinder 2 is provided with an electric heating pipe interface connecting hole 221; the electric heating tube 3 is arranged in the heating cylinder cavity 21, the upper end of the electric heating tube 3 is fixed with the heating cylinder top wall 22 at the position corresponding to the electric heating tube interface connection hole 221, the lower end of the electric heating tube 3 extends downwards to the outside of the heating cylinder cavity 21 and is fixed with the electric heating tube water supply mechanism 4, the electric heating tube cavity 31 of the electric heating tube 3 is communicated with the furnace shell cavity 11 and the electric heating tube water supply mechanism 4, a high temperature resistant insulating layer 32 which is schematically shown in figure 2, a thick film resistance heating printed circuit 33 which is a thick film resistance heating printed circuit layer (the same below) and a high temperature resistant insulating outer protective layer 34 are sequentially combined on the outer wall of the middle part of the electric heating tube 3 in the height direction from inside to outside, a conducting sheet 331 is respectively welded at two ends of the thick film resistance heating printed circuit 33, a power wire 3311 is welded on the conducting sheet 331, and the power wire 3311 is electrically connected with an external power circuit in, the electric heating pipe water supply mechanism 4 is connected with a water source pipeline in a use state.

A safety air release valve 15 and a liquid level device 16 are arranged on the top of the furnace shell 1, a drain interface 17 is arranged on the bottom of the furnace shell 1 and on one side of the furnace shell flange 14, and a steam pressure controller adapting port 18 communicated with the furnace shell cavity 11 is arranged on the upper side of the furnace shell 1. In the using state, when the pressure in the furnace shell cavity 11 exceeds the set value, the safety air release valve 15 is automatically opened to release the pressure, otherwise, in the same way, the pressure of the air in the furnace shell cavity 11 is sensed and controlled by the steam pressure controller 18, and the steam pressure controller 18 is electrically connected with the electric control box in a control way. The level gauge 16 has a lower level probe 161 and an upper level probe 162, and when the level of water in the furnace shell chamber 11 drops to a level insufficient to be detected by the lower level probe 161, the level gauge 16 feeds back a signal to the electrical controller to open a valve on the pipe of the furnace shell water inlet port 13, i.e., the water source pipe, and when the level rises to a level that is detected by the upper level probe 162, the valve on the water source pipe is closed.

A heating tube fixing flange 23 is formed at a lower end of the heating tube 2 and at a position corresponding to a lower portion of the furnace shell flange 14, a heating tube fixing flange seal ring 231 is provided between the heating tube fixing flange 23 and the furnace shell flange 14, and the heating tube fixing flange 23 and the furnace shell flange 14 are fixed by a heating tube fixing flange screw 232 together with the heating tube fixing flange seal ring 231.

As shown in fig. 1 and 2, a wrench operation member 35 is welded to the upper end of the electric heating tube 3, a heating tube fitting port 351 extends from a central position of an upward side of the wrench operation member 35, the heating tube fitting port 351 is fixed to the heating tube top wall 22 at a position corresponding to the electric heating tube fitting port 221, a seal is formed between an outer wall of the heating tube fitting port 351 and a hole wall of the electric heating tube fitting port 221, and a mouth portion of the upward side of the heating tube fitting port 351 is configured as a steam outlet of the electric heating tube 3.

In the present embodiment, the thick film resistance heating printed circuit 33 is formed on the surface of the high temperature insulation layer 32 opposite to the electric heating tube 3 by screen printing and is covered by the high temperature insulation outer sheath 34. In the present embodiment, the thick film resistance heating printed circuit 33 has a shape of a zigzag or S-shape in which a plurality of cycles are repeated and both ends are broken, that is, both ends are shared, but may have other similar shapes.

In this embodiment, the high temperature insulating layer 32 is a high temperature insulating ceramic layer; the high-temperature-resistant insulating outer sheath 34 is a transparent high-temperature-resistant insulating ceramic layer or an epoxy resin layer.

In the present embodiment, the number of the electric heating tubes 3 is three, but the number is not limited to this, and therefore the number of the electric heating tubes 3 may be increased or decreased in order according to the specific application.

In this embodiment, the wrench operation member 35 is an external hexagonal nut, and an external thread is formed on the outer wall of the heating pipe fitting port 351, so that the heating pipe fitting port 351 can be securely locked with the top wall of the heating cylinder by the nut if necessary.

Referring to fig. 1, the aforementioned electric-heating-pipe water supply mechanism 4 includes an inlet water diversion plate 41 and an inlet water diversion plate cover 42, the inlet water diversion plate 41 is located below the inlet water diversion plate cover 42, a water inlet branch disc cavity water inlet hole 4111 is arranged at the central position of the bottom wall of the water inlet branch disc cavity 411 of the water inlet branch disc 41, a water inlet joint 41111 of the water inlet distribution plate is fixed at the position corresponding to the water inlet hole 4111 of the water inlet distribution plate cavity and at the side of the bottom wall of the water inlet distribution plate cavity, which faces away from the water inlet distribution plate cavity 411, the inlet joint 41111 of the inlet diversion plate is connected to a water source pipeline, such as a tap water pipeline, in a use state, the inlet diversion plate cover 42 is fixed above the inlet diversion plate 41 in a sealing manner, the lower end of the electric heating tube 3 extends out of the lower part of the heating cylinder cavity 21 and is fixed to the inlet diversion plate cover 42, and the electric heating tube cavity 31 of the electric heating tube 3 is communicated with the inlet diversion plate cavity 411.

The water inlet manifold 41 is formed with a water inlet manifold flange 412, and flange fixing screws 4121 are provided at intervals on the water inlet manifold flange 412, and the flange fixing screws 4121 are fixed to the water inlet manifold cover 42 and are defined by a limiting nut 41211 screwed on the flange fixing screws 4121.

Preferably, a sealing gasket 4122 is provided between the inlet diverter tray flange 412 and the inlet diverter tray cover 42.

When the power line 3311 is in the power-on state, the thick film resistor heating printed circuit 33 heats and vaporizes the water flowing through the electric heating tube cavity 31 sequentially from the water inlet joint 41111 of the water inlet split-flow tray and the water inlet split-flow tray cavity 411, and at the same time, performs radiation heating on the heating cylinder 2, the steam from the electric heating tube 3 is led from the steam outlet on the upper part of the electric heating tube cavity 31 to enter the furnace shell cavity 11, heats and vaporizes the water in the furnace shell cavity 11, and at the same time, the water in the furnace shell cavity 11 is heated and vaporized by the heating cylinder 2, and the steam in the furnace shell cavity 11 is led out for use by the pipeline connected with the furnace shell steam leading-out interface 12.

To sum up, the technical solution provided by the present invention remedies the defects in the prior art, successfully completes the invention task, and faithfully embodies the technical effects mentioned in the above technical effect column by the applicant.

Claims

1. An electric heating steam generator for a steam boiler, the steam boiler comprises a furnace shell (1), the top of the furnace shell (1) is connected with a furnace shell steam leading-out interface (12) for leading out steam in a furnace shell cavity (11) of the furnace shell (1), the furnace shell (1) is also provided with a furnace shell water leading-out interface (13) for leading water into the furnace shell cavity (11), a furnace shell flange (14) is formed at the central position of the bottom of the furnace shell (1), a heating cylinder abdicating hole (141) is formed at the central position of the furnace shell flange (14), the electric heating steam generator is characterized by comprising a heating cylinder (2), an electric heating pipe (3) and an electric heating pipe water supply mechanism (4), the upper end of the heating cylinder (2) extends into the furnace shell cavity (11) from the heating cylinder abdicating hole (141), and the lower end of the heating cylinder (2) is arranged at a position corresponding to the lower part of the furnace shell flange (14) and the furnace shell flange (11) (14) The heating device is fixed, the lower end of a heating cylinder cavity (21) of the heating cylinder (2) is communicated with the outside, and an electric heating pipe interface matching hole (221) is formed in the top wall (22) of the heating cylinder (2); the electric heating pipe (3) is arranged in the heating cylinder cavity (21), the upper end of the electric heating pipe (3) is fixed with the heating cylinder top wall (22) at a position corresponding to the electric heating pipe interface connection hole (221), the lower end of the electric heating pipe (3) extends downwards to the outside of the heating cylinder cavity (21) and is fixed with the electric heating pipe water supply mechanism (4), an electric heating pipe cavity (31) of the electric heating pipe (3) is communicated with the furnace shell cavity (11) and the electric heating pipe water supply mechanism (4), a high-temperature-resistant insulating layer (32), a thick-film resistance heating printed circuit (33) and a high-temperature-resistant insulating outer conducting sheet (34) are sequentially combined on the outer wall of the middle part of the height direction of the electric heating pipe (3) from inside to outside, two ends of the thick-film resistance heating printed circuit (33) are respectively welded with a conducting sheet (331), and a power line (3311) is welded on the inherent conducting sheet (331), the power line (3311) is electrically connected with an external power circuit in a use state, and the electric heating pipe water supply mechanism (4) is connected with a water source pipeline in a use state.

2. An electrically heated steam generator for a steam boiler according to claim 1, characterised in that a safety vent valve (15) and a level gauge (16) are arranged on the top of the furnace shell (1), that a sewage connection (17) is arranged on the bottom of the furnace shell (1) and on the side of the furnace shell flange (14), and that a steam pressure controller connection (18) is arranged on the upper side of the furnace shell (1) and communicates with the furnace shell cavity (11).

3. An electrically heated steam generator for a steam boiler in accordance with claim 1, characterized in that a cartridge fixing flange (23) is formed at the lower end of the cartridge (2) and at a position corresponding to the lower side of the shell flange (14), a cartridge fixing flange seal ring (231) is provided between the cartridge fixing flange (23) and the shell flange (14), and the cartridge fixing flange (23) is fixed to the shell flange (14) by cartridge fixing flange screws (232) together with the cartridge fixing flange seal ring (231).

4. An electrically heated steam generator for a steam boiler, as claimed in claim 1, wherein a wrench operation member (35) is welded to an upper end of the electric heating tube (3), a heating tube fitting port (351) extends at a central position of an upward facing side of the wrench operation member (35), the heating tube fitting port (351) is fixed to the heating tube top wall (22) at a position corresponding to the electric heating tube fitting port (221), and a seal is formed between an outer wall of the heating tube fitting port (351) and a wall of the electric heating tube fitting port (221), and a mouth of the upward facing side of the heating tube fitting port (351) is formed as a steam outlet of the electric heating tube (3).

5. An electrically heated steam generator for a steam boiler as claimed in claim 1, characterized in that said thick film resistance heating printed circuit (33) is formed by screen printing on a surface of said high temperature resistant insulating layer (32) facing away from said electric heating tube (3) and covered by said high temperature resistant insulating outer sheath (34).

6. An electrically heated steam generator for a steam boiler, as claimed in claim 1 or 5, characterised in that said refractory insulating layer (32) is a refractory insulating ceramic layer; the high-temperature-resistant insulating outer protective layer (34) is a transparent high-temperature-resistant insulating ceramic layer or an epoxy resin layer.

7. The electric steam generator for a steam boiler as set forth in claim 4, wherein said wrench operation member (35) is an outer hexagonal nut, and an external thread is formed on an outer wall of said heating pipe fitting port (351).

8. An electrically heated steam generator for a steam boiler as claimed in claim 1, wherein said electric heating tube water supply mechanism (4) comprises a water inlet diverter tray (41) and a water inlet diverter tray cover (42), the water inlet diverter tray (41) is located below the water inlet diverter tray cover (42), a water inlet diverter tray chamber inlet hole (4111) is formed at a central position of the water inlet diverter tray chamber bottom wall of the water inlet diverter tray chamber (411) of the water inlet diverter tray (41), a water inlet diverter tray inlet joint (41111) is fixed at a position corresponding to the water inlet diverter tray chamber inlet hole (4111) and at a side of the water inlet diverter tray chamber bottom wall opposite to the water inlet diverter tray chamber (411), the water inlet diverter tray inlet joint (41111) is connected to the water supply line in use, the water inlet diverter tray cover (42) is fixed to the upper position of the water inlet diverter tray (41) in a sealing manner, the lower end of the electric heating pipe (3) is fixed with a water inlet split-flow tray cover (42), and the electric heating pipe cavity (31) of the electric heating pipe (3) is communicated with the water inlet split-flow tray cavity (411).

9. An electrically heated steam generator for a steam boiler as set forth in claim 8 wherein said inlet manifold (41) is formed with an inlet manifold flange (412), and flange fixing screws (4121) are provided at intervals on said inlet manifold flange (412), said flange fixing screws (4121) being fixed to said inlet manifold cover (42) and being defined by limiting nuts (41211) screwed on said flange fixing screws (4121).

10. An electrically heated steam generator for a steam boiler as set forth in claim 9 wherein a sealing gasket (4122) is provided between said inlet manifold flange (412) and said inlet manifold cover (42).