Electrical heating tube assembly and electric boiler

Abstract

The utility model discloses a kind of electric heating tube assemblies, including several resistance wires, lead-out rod and several butt columns, the butt column is the butt column of cylindrical insulating material, the end of each butt column is provided with protrusion, the other end of each butt column is provided with inner recess, through hole is set up on each butt column, the inner recess and protrusion of the recess between the two butt columns of adjacent are matched together, the resistance and lead-out rod are set in the through hole of the butt column, the resistance wire and lead-out rod do not contact with the hole wall of through hole, and resistance wire and lead-out rod are filled with insulating powder between the hole wall of through hole, lead-out rod is electrically connected with the resistance wire. The present application also discloses an electric boiler comprising the above-mentioned electric heating tube assembly.

Description

Technical Field

[0001] This utility model relates to the field of boiler products, and in particular to an electric heating tube assembly. Background Technology

[0002] Electric tube boilers are a commonly used type of boiler, and the electric tube assembly is a very important component of electric tube boilers. Patent publication document CN209767849U discloses an electric tube assembly for electric tube boilers. This electric tube assembly mainly consists of a resistance rod and an insulating sleeve, with the insulating sleeve covering the resistance rod. There is a problem with this structure of electric tube assembly during use: when the electric tube assembly is subjected to external impact, the impact is transmitted to the resistance rod. As a result, with the extension of use, the resistance rod will twist, and gaps will appear in the seal between two adjacent insulating sleeves, which will lead to the failure of the entire electric tube assembly. Utility Model Content

[0003] To address the aforementioned problems, this invention proposes an electric heating tube assembly. By employing several connecting posts, an insulating intermediate sleeve with impact-resistant deformation properties is formed. The lead-out rod and resistance wire are both disposed within this insulating intermediate sleeve. The gaps between the lead-out rod and resistance wire and the insulating intermediate sleeve are filled with insulating powder, ensuring that the lead-out rod and resistance wire are not subjected to external impacts, and that the lead-out rod and resistance wire have a relatively long service life.

[0004] The technical solution adopted by this utility model is as follows:

[0005] An electric heating element assembly includes several resistance wires, lead rods, and several connecting posts. The connecting posts are cylindrical insulating material, each with a protrusion at one end and a concave end at the other. Each connecting post has a through hole, and the concave and protrusion of adjacent connecting posts fit together. The resistance wires and lead rods are disposed within the through holes of the connecting posts. The resistance wires and lead rods do not contact the wall of the through holes, and insulating powder is filled between the resistance wires and lead rods and the wall of the through holes. The lead rods are electrically connected to the resistance wires.

[0006] In this type of electric heating tube assembly, the lead rod and the resistance wire are used for heating (i.e., charging resistor). Several mating posts form an insulating intermediate sleeve by means of protrusion and concave mating. The lead rod and the resistance wire are both located inside the insulating intermediate sleeve, and the gap between the lead rod, the resistance wire and the insulating intermediate sleeve is filled with insulating powder. The heat generated by the resistance wire (and the lead rod) is transferred to the insulating intermediate sleeve through the insulating powder, and the insulating intermediate sleeve then dissipates the heat to the surrounding edges.

[0007] In this type of heating element assembly, the insulating intermediate sleeve is composed of several mating posts connected together, and the gap between two adjacent mating posts is filled with insulating powder. Therefore, the entire insulating intermediate sleeve is essentially a flexible insulating intermediate sleeve that can adapt to deformation. Furthermore, since the insulating intermediate sleeve is also filled with insulating powder between itself and the lead-out rod and resistance wire, it ensures that the lead-out rod and resistance wire are not rigidly fixed to the insulating intermediate sleeve. Therefore, when an external force impacts the insulating intermediate sleeve, it can adapt to deformation (the deformation is very small). The presence of insulating powder ensures that the seal between the two mating posts remains intact, and the impact is not transmitted to the lead-out rod and resistance wire. This ensures that the lead-out rod and resistance wire are always protected from external impacts, thus ensuring a relatively long service life for the lead-out rod and resistance wire.

[0008] Meanwhile, in this type of electric heating tube assembly, an insulating intermediate sleeve with impact-resistant deformation performance is formed by connecting several butt joints. The lead rod and the resistance wire are both set inside the insulating intermediate sleeve. The gap between the lead rod and the resistance wire and the insulating intermediate sleeve is filled with insulating powder, which ensures that the lead rod and the resistance wire will not be subjected to external impact, and the lead rod and the resistance wire have a relatively long service life.

[0009] Specifically, to ensure stable docking of the two docking posts and allow for some adaptive swaying between adjacent docking posts, both the protrusions and concave sections are shaped like regular frustums.

[0010] Optionally, the number of lead-out rods is equal to the number of through holes on the docking post, and each docking post has four through holes.

[0011] The purpose of the through hole is to accommodate the lead-out rod and the resistance wire. The through hole can be, but is not limited to, a circular through hole.

[0012] Optionally, the gap between two adjacent mating posts is filled with insulating powder.

[0013] Specific insulating powders include, but are not limited to, magnesium oxide powder.

[0014] Optionally, one end of the docking post is provided with a filling notch.

[0015] The purpose of setting the filling gap is to allow insulating powder to be poured between the docking post and the metal outer sleeve after all the docking posts are installed, ensuring that the space between the docking post and the insulating outer sleeve, as well as between two adjacent docking posts, is filled with insulating powder.

[0016] Optionally, it also includes a metal outer tube, in which both the docking post and the resistance rod are disposed, and the inner wall of the metal outer tube and the docking post are filled with insulating powder.

[0017] The metal outer sheath serves two purposes: first, it ensures the overall rigidity of the heating element assembly; second, it dissipates heat quickly, facilitating rapid heat transfer to the heated medium. In this design, insulating powder is used to fill the space between the insulating intermediate sleeve and the metal outer sheath. The presence of this powder facilitates rapid heat transfer between the two materials and also provides a good buffering effect. Specifically, the metal outer sheath includes, but is not limited to, an outer sheath made of stainless steel.

[0018] Optionally, it also includes a sealing gasket and a head plate, which are respectively disposed at both ends of the metal outer sleeve, and the sealing gasket and the head plate abut against the docking post.

[0019] Specifically, the end plate is made of metal and is welded and fixed to one end of the metal outer sleeve. The end plate is hemispherical, with the arc end of the end plate facing the docking column. The arc end of the end plate directly or indirectly abuts against the docking column.

[0020] Optionally, an insulating spacer is also included, which is disposed between the end cap plate and the docking post.

[0021] The function of the insulating spacer is to support the mating post and seal one end of the mating post, so that the resistance wire is in a relatively closed state.

[0022] Optionally, it also includes an insulating sheath that covers the lead-out rod and is located between the lead-out rod and the sealing gasket.

[0023] The insulating sheath serves to cover the lead-out rod.

[0024] The beneficial effects of this utility model are: by using a number of connecting posts to form an insulating intermediate sleeve with impact deformation resistance, the lead rod and the resistance wire are both set inside the insulating intermediate sleeve, and the gap between the lead rod and the resistance wire and the insulating intermediate sleeve is filled with insulating powder, which ensures that the lead rod and the resistance wire will not be impacted by external forces, and the lead rod and the resistance wire have a relatively long service life. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1 This is a simplified structural diagram of an electric heating element assembly;

[0027] Figure 2 yes Figure 1 A simplified enlarged diagram of point A in the middle;

[0028] Figure 3 yes Figure 1 A simplified enlarged diagram of point B in the middle;

[0029] Figure 4 This is a simplified cross-sectional diagram of the connecting column;

[0030] Figure 5 This is a top view of the connecting column.

[0031] The labels in the attached figures are as follows: 1. Lead-out rod; 2. Insulating sheath; 3. Metal outer sheath; 4. Sealing gasket; 5. Butt joint post; 501. Concave; 502. Through hole; 503. Protrusion; 504. Filling notch; 6. Resistance wire; 7. Insulating spacer; 8. End plate. Detailed Implementation

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0035] Example 1

[0036] As attached Figure 1 ~Appendix Figure 5As shown, an electric heating tube assembly includes several resistance wires 6, lead rods 1, and several connecting posts 5. The connecting posts 5 are cylindrical insulating material connecting posts 5. One end of each connecting post 5 is provided with a protrusion 503, and the other end of each connecting post 5 is provided with a concave 501. Each connecting post 5 has a through hole 502. The concave 501 and protrusion 503 between two adjacent connecting posts 5 are engaged together. The resistor and the lead rod 1 are disposed in the through hole 502 of the connecting post 5. The resistance wires 6 and the lead rod 1 do not contact the hole wall of the through hole 502, and the space between the resistance wires 6 and the lead rod 1 and the hole wall of the through hole 502 is filled with insulating powder. The lead rod 1 is electrically connected to the resistance wires 6.

[0037] In this type of electric heating tube assembly, the lead rod 1 and the resistance wire 6 are used for heating (i.e., charging resistor). Several mating posts 5 form an insulating intermediate sleeve by mating the protrusions 503 and the concave parts 501. The lead rod 1 and the resistance wire 6 are both located inside the insulating intermediate sleeve, and the gap between the lead rod 1, the resistance wire 6 and the insulating intermediate sleeve is filled with insulating powder. The heat generated by the resistance wire 6 (and the lead rod 1) is transferred to the insulating intermediate sleeve through the insulating powder, and the insulating intermediate sleeve then dissipates the heat to the surrounding edges.

[0038] In this type of heating element assembly, the insulating intermediate sleeve is composed of several mating posts 5 connected together, and the gap between two adjacent mating posts 5 is filled with insulating powder. Therefore, the entire insulating intermediate sleeve is equivalent to a flexible insulating intermediate sleeve, which can undergo adaptive deformation. Since the insulating intermediate sleeve is also filled with insulating powder between it and the lead-out rod 1 and the resistance wire 6, it is ensured that the lead-out rod 1 and the resistance wire 6 are not rigidly fixed to the insulating intermediate sleeve. Therefore, when an external force impacts the insulating intermediate sleeve, the insulating intermediate sleeve itself can undergo adaptive deformation (the deformation is very small). The presence of insulating powder ensures that the seal between the two mating posts 5 remains intact, and the impact is not transmitted to the lead-out rod 1 and the resistance wire 6. This ensures that the lead-out rod 1 and the resistance wire 6 are always free from external impact, ensuring that the lead-out rod 1 and the resistance wire 6 have a relatively long service life.

[0039] Meanwhile, in this type of electric heating tube assembly, an insulating intermediate sleeve with impact-resistant deformation performance is formed by connecting several connecting posts 5. The lead rod 1 and the resistance wire 6 are both set inside the insulating intermediate sleeve. The gap between the lead rod 1 and the resistance wire 6 and the insulating intermediate sleeve is filled with insulating powder, which ensures that the lead rod 1 and the resistance wire 6 will not be subjected to external impact, and the lead rod 1 and the resistance wire 6 have a relatively long service life.

[0040] Specifically, in order to ensure the stable docking of the two docking posts 5 and to allow for a certain degree of adaptive swaying between adjacent docking posts 5, both the protrusion 503 and the concave 501 are in the shape of a regular frustum.

[0041] As attached Figure 1 ~Appendix Figure 5 As shown, the number of lead-out rods 1 is equal to the number of through holes 502 on the docking post 5, and each docking post 5 has four through holes 502.

[0042] The function of the through hole 502 is to accommodate the lead-out rod 1 and the resistance wire 6. Specifically, the through hole 502 can be, but is not limited to, a circular through hole 502.

[0043] As attached Figure 1 ~Appendix Figure 5 As shown, the gap between two adjacent butt joints 5 is filled with insulating powder.

[0044] Specific insulating powders include, but are not limited to, magnesium oxide powder.

[0045] As attached Figure 1 ~Appendix Figure 5 As shown, a filling notch 504 is provided at one end of the docking post 5.

[0046] The purpose of setting the filling notch 504 is to allow insulating powder to be poured between the docking post 5 and the metal outer sleeve 3 after the docking post 5 is fully inserted into the metal outer sleeve 3, so as to ensure that the space between the docking post 5 and the insulating outer sleeve, as well as between two adjacent docking posts 5, is filled with insulating powder.

[0047] As attached Figure 1 ~Appendix Figure 5 As shown, it also includes a metal outer tube 3, with the docking post 5 and the resistance rod both disposed inside the metal outer tube 3, and the space between the inner wall of the metal outer tube 3 and the docking post 5 is filled with insulating powder.

[0048] The metal outer tube 3 serves two purposes: first, it ensures the overall rigidity of the heating element assembly; second, it dissipates heat quickly, facilitating rapid heat transfer to the heated medium. Furthermore, in this design, insulating powder is used to fill the space between the insulating intermediate sleeve and the metal outer tube 3. The presence of the insulating powder facilitates rapid heat transfer between the insulating intermediate sleeve and the metal outer tube 3, and also provides a good buffering effect between them. Specifically, the metal outer tube 3 includes, but is not limited to, an outer tube made of stainless steel.

[0049] As attached Figure 1 ~Appendix Figure 5 As shown, it also includes a sealing gasket 4 and a head plate 8, which are respectively disposed at both ends of the metal outer sleeve 3, and the sealing gasket 4 and the head plate 8 abut against the docking post 5.

[0050] Specifically, the end plate 8 is a metal end plate 8, which is welded and fixed to one end of the metal outer sleeve 3. The end plate 8 is hemispherical, with the arc end of the end plate 8 facing the docking column 5. The arc end of the end plate 8 directly or indirectly abuts against the docking column 5.

[0051] The sealing gasket 4 can be made of rubber or ceramic.

[0052] As attached Figure 1 ~Appendix Figure 5 As shown, it also includes an insulating spacer 7, which is disposed between the end plate 8 and the docking post 5.

[0053] The function of the insulating spacer 7 is to support the mating post 5 and seal one end of the mating post 5, so that the resistance wire 6 is in a relatively closed state. Specifically, the insulating spacer 7 can be made of ceramic, magnesium oxide, or rubber and plastic.

[0054] As attached Figure 1 ~Appendix Figure 5 As shown, it also includes an insulating sheath tube 2, which covers the lead-out rod 1 and is located between the lead-out rod 1 and the sealing gasket 4.

[0055] The function of the insulating sheath tube 2 is to cover the lead-out rod 1.

[0056] The assembly process between these heating elements is as follows: First, the end plate 8 is fixed to one end of the metal outer tube 3. Then, the connecting post 5 is installed into the metal outer tube 3. Next, the resistance wire 6 and the lead rod 1 are installed into the connecting post 5. Then, magnesium oxide powder is filled into the tube.

[0057] Example 2

[0058] An electric boiler includes an electric heating tube assembly as shown in Embodiment 1, and a furnace shell. The electric heating tube assembly is disposed inside the furnace shell. There are multiple sets of electric heating tube assemblies. The operating voltage of the electric heating tube assembly inside the furnace shell is 10kV. The electric heating tube assembly is used to heat the liquid inside the furnace shell or heat it into steam. This type of boiler is an electric heating tube boiler.

[0059] Example 3

[0060] An electric steam generation system includes an electric boiler as shown in Example 2, the electric boiler being used to heat water into steam.

[0061] Example 4

[0062] A steam energy storage system includes an electric boiler as shown in Example 2, the electric boiler being used to heat water into steam and store it in a steam storage tank.

[0063] Example 5

[0064] A peak-shaving system for a thermal power plant includes an electric boiler as shown in Example 2, wherein the electric boiler is connected to a heat storage tank, and the electric boiler heats water from a low temperature to a high temperature before storing it in the heat storage tank.

[0065] The above-described embodiments only represent some implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A heating element assembly, characterized in that, It includes several resistance wires, lead-out rods, and several mating posts. The mating posts are cylindrical insulating material. Each mating post has a protrusion at one end and a concave end at the other end. Each mating post has a through hole. The concave and protrusion of two adjacent mating posts fit together. The resistor and lead-out rod are disposed in the through hole of the mating post. The resistance wires and lead-out rods do not contact the hole wall of the through hole. The lead-out rods are electrically connected to the resistance wires. Both the protrusion and the concave are in the shape of a regular frustum.

2. The electric heating tube assembly according to claim 1, characterized in that, The number of lead-out rods is equal to the number of through holes on the docking post, and the through holes include circular through holes.

3. The electric heating tube assembly according to claim 1, characterized in that, The gap between two adjacent butt joints is filled with insulating powder, which includes magnesium oxide powder.

4. The electric heating tube assembly according to claim 1, characterized in that, One end of the docking post is provided with a filling notch.

5. The electric heating tube assembly according to claim 1, characterized in that, It also includes a metal outer tube, and both the docking post and the resistance rod are disposed inside the metal outer tube.

6. The electric heating tube assembly according to claim 5, characterized in that, It also includes a sealing gasket and a head plate, which are respectively disposed at both ends of the metal outer sleeve. The sealing gasket and the head plate abut against the docking post. The head plate is hemispherical, and the arc end of the head plate faces the docking post.

7. The electric heating tube assembly according to claim 6, characterized in that, It also includes an insulating spacer, which is disposed between the end cap plate and the docking post.

8. The electric heating tube assembly according to claim 6, characterized in that, It also includes an insulating sheath that covers the lead-out rod.

9. An electric boiler, characterized in that, Includes the electric heating tube assembly as described in any one of claims 1 to 8.

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