An electric heater based on deep-hole wire insertion welding

Abstract

The application discloses a kind of electric heater based on deep hole wire welding, it includes electric heater body, electric heater body includes shell, tube plate and electric heating tube, one end of shell is open, tube plate is connected to the open end of shell, electric heating tube is parallelly arranged with several roots in shell, electric heating tube penetrates tube plate, installation hole is opened in tube plate, the side of tube plate located outside shell is provided with several welding ring grooves, welding ring groove is coaxially arranged with several installation holes one by one, the inner diameter of welding ring groove is greater than the inner diameter of installation hole, several insertion grooves are opened on the outer ring wall of electric heating tube along its length direction, the inner wall of installation hole is connected with several insertion strips, one end of insertion groove extends to the end of electric heating tube located outside shell, several insertion strips and several insertion grooves are one by one corresponding and insertion fit.The application has the effect of improving the structural strength of electric heater, prolonging the service life of electric heater.

Description

Technical Field

[0001] This application relates to the technical field of electric heater manufacturing, and in particular to an electric heater based on deep hole wire bonding. Background Technology

[0002] An electric heater is an electrical appliance that uses electrical energy to achieve a heating effect. It has advantages such as small size, high heating power, high temperature control accuracy, wide application range, long lifespan, and high reliability. The core principle of a heater is energy conversion, most commonly the conversion of electrical energy into heat energy.

[0003] Currently, electric heaters consist of a hollow shell with a tube sheet connected to its open end. Several parallel heating elements are arranged inside the shell, penetrating the tube sheet. To improve the structural stability of the electric heater, the contact points between the tube sheet and the heating elements need to be welded, ensuring the tube sheet and heating element remain relatively stationary. During welding, a tubular welding torch is fitted over one end of the heating element and abuts against the tube sheet. The end of the welding torch heats up, melting the connection point between the heating element and the tube sheet. After cooling, the tube sheet and heating element are successfully welded.

[0004] Regarding the aforementioned technologies, the inventors believe that during the production process of the electric heater, the small contact area between the tube sheet and the electric heating tube leads to insufficient structural strength at the welding points, thus reducing the service life of the electric heater. Utility Model Content

[0005] In order to improve the structural strength and extend the service life of electric heaters, this application provides an electric heater based on deep hole wire welding.

[0006] The electric heater based on deep hole wire welding provided in this application adopts the following technical solution:

[0007] An electric heater based on deep hole wire welding includes an electric heater body, which includes a shell, a tube sheet, and electric heating tubes. One end of the shell is open, and the tube sheet is connected to the open end of the shell. Several electric heating tubes are arranged parallel to each other in the shell, passing through the tube sheet and perpendicularly connected to it. Several mounting holes for the electric heating tubes to pass through are opened on the tube sheet. Several welding annular grooves are opened on the side of the tube sheet outside the shell. The welding annular grooves correspond one-to-one with the mounting holes and are coaxially arranged. The inner diameter of the welding annular grooves is larger than the inner diameter of the mounting holes. Several insertion grooves are opened along the length direction on the outer annular wall of the electric heating tube. Several insertion strips are connected to the inner wall of the mounting holes. One end of the insertion groove extends to the end of the electric heating tube outside the shell. The insertion strips correspond one-to-one with the insertion grooves and are inserted into each other.

[0008] By adopting the above technical solution, during welding, a tubular welding torch is fitted onto the section of the electric heating tube located outside the shell, and the connection position between the electric heating tube and the tube sheet is heated. The tube sheet between the welding annular groove and the mounting hole melts under heating. The connector strip is inserted into the corresponding connector groove, increasing the contact area between the tube sheet and the electric heating tube. Part of the molten metal is immersed in the gaps between the connector groove and the connector strip, as well as between the mounting hole and the electric heating tube. After the molten metal solidifies, the connection between the electric heating tube and the tube sheet is achieved. Through the cooperation of the electric heater body and the connector strip, the structural strength of the electric heater is improved, and its service life is extended.

[0009] Optionally, the length of the connector strip is greater than the thickness of the tube sheet, and one end of the connector strip is flush with the side of the tube sheet located in the inner cavity of the housing.

[0010] By adopting the above technical solution, since the length of the connector strip is greater than the thickness of the tube sheet, the contact area between the connector strip and the electric heating tube is increased, which helps to improve the welding strength of the electric heating tube. In addition, one end of the connector strip extends to the outside of the tube sheet, and during the welding of the tube sheet and the electric heating tube, part of the connector strip melts, further improving the welding strength of the device.

[0011] Optionally, the tube sheet is connected to a plurality of support rings on one side of the inner cavity of the housing. The plurality of support rings correspond one-to-one with the plurality of mounting holes and are connected in communication. The inner wall of the support ring is fitted to the outer ring wall of the corresponding electric heating tube.

[0012] By adopting the above technical solution, the support ring is fitted to the outer wall of the electric heating tube, and the support ring supports the electric heating tube, reducing the possibility of deformation caused by excessive pressure at the connection between the tube sheet and the electric heating tube.

[0013] Optionally, an abutment ring is connected to the outer ring wall of the electric heating tube, and one side of the abutment ring abuts against one end of the support ring.

[0014] By adopting the above technical solution, the setting of the abutment ring realizes the limitation of the electric heating tube and the relative position between the electric heating tube and the tube sheet, which helps to improve the processing accuracy of the electric heater.

[0015] Optionally, the tube sheet is provided with a plurality of welding rings on the side outside the housing, and the plurality of welding rings correspond one-to-one with the plurality of electric heating tubes, and the inner ring wall of the welding ring is fitted to the outer ring wall of the electric heating tube.

[0016] By adopting the above technical solution, the repair welding ring is set at the joint between the electric heating tube and the tube sheet. When the two are welded together with a welding torch, the repair welding ring melts under high temperature, which increases the welding knot between the electric heating tube and the tube sheet and helps to further improve the welding strength of the two.

[0017] Optionally, the tube sheet has a plurality of mounting ring grooves on the side outside the housing, and the plurality of mounting ring grooves correspond one-to-one with and are connected to the plurality of mounting holes. One side of the repair welding ring is embedded in the mounting ring groove, and the other side of the repair welding ring extends to the outside of the tube sheet.

[0018] By adopting the above technical solution, the installation ring groove facilitates operators in connecting different welding rings to the tube sheet for different welding needs. In addition, the installation ring groove increases the contact area between the welding ring and the tube sheet, which helps to improve the connection strength in subsequent welding processes.

[0019] Optionally, a connecting plate is provided on one side of the tube sheet located inside the housing. The connecting plate has several connection ports. The support rings are connected to the connecting plate, and one end of each of the support rings corresponds to and communicates with the connection ports.

[0020] By adopting the above technical solution, connecting plates with support rings of different diameters can be connected to the tube sheet for electric heating tubes of different diameters, thus expanding the applicability of the device.

[0021] Optionally, the connecting plate has several plug-in arc plates connected circumferentially along its side, and the tube plate has several plug-in arc grooves circumferentially opened along its side. The plug-in arc plates and the plug-in arc grooves correspond one-to-one and are plugged in. The plug-in arc plates are connected to the tube plate through connectors, and the outer arc wall of the plug-in arc plate is flush with the peripheral wall of the tube plate.

[0022] By adopting the above technical solution, the insertion arc plate and the insertion arc groove are interlocked, allowing several support rings to correspond one-to-one with several mounting holes on the tube sheet, facilitating the installation of the connecting plate by the operator. Since the outer arc wall of the insertion arc plate is flush with the outer ring wall of the tube sheet, it facilitates the subsequent connection of the tube sheet to other structures by the operator.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Through the cooperation of the electric heater body and the connector strip, the structural strength of the electric heater is improved and the service life of the electric heater is extended;

[0025] 2. The repair welding ring is placed at the joint between the electric heating tube and the tube sheet. When welding the two together with a welding torch, the repair welding ring melts under high temperature, which increases the welding knot between the electric heating tube and the tube sheet and helps to further improve the welding strength of the two.

[0026] 3. The support ring supports the electric heating element, reducing the possibility of deformation caused by excessive pressure at the connection between the tube sheet and the electric heating element. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the structure of an electric heater based on deep hole wire bonding, as described in this application.

[0028] Figure 2 This is a partial cross-sectional view used in the embodiments of this application to illustrate the internal structure of the shell.

[0029] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0030] Explanation of reference numerals in the attached drawings: 1. Shell; 2. Tube sheet; 21. Mounting hole; 22. Welding ring groove; 23. Mounting ring groove; 24. Insertion arc groove; 3. Electric heating tube; 31. Insertion groove; 4. Insertion strip; 5. Support ring; 6. Connecting plate; 61. Connection port; 62. Insertion arc plate; 63. Connecting bolt; 7. Repair weld ring; 8. Abutment ring; 81. Contact ring groove. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 This application will be further described in detail below. Embodiments of this application provide an electric heater based on deep-hole wire-addition welding, which has the effect of improving the structural strength of the electric heater and extending its service life.

[0032] Reference Figure 1-3 An electric heater based on deep-hole wire-addition welding includes an electric heater body, a connector strip 4, a support ring 5, and a connecting plate 6. The electric heater body includes a shell 1, a tube sheet 2, and electric heating tubes 3. The shell 1 is cylindrical, with one end open. The tube sheet 2 is connected to the inner annular wall of the open end of the shell 1. Several electric heating tubes 3 are arranged parallel to each other within the shell 1, penetrating the tube sheet 2 and perpendicular to it. The tube sheet 2 has several mounting holes 21, each corresponding to and interlocking with a number of electric heating tubes. On the side of the tube sheet 2 outside the shell 1, several welding annular grooves 22 are provided, corresponding to and coaxially arranged with the mounting holes 21. The inner diameter of the welding annular grooves 22 is larger than the inner diameter of the mounting holes 21.

[0033] Reference Figure 3Several connector strips 4 are connected circumferentially on the inner annular wall of the mounting hole 21, and the length direction of the connector strips 4 is parallel to the axial direction of the mounting hole 21. The length of the connector strips 4 is greater than the thickness of the tube sheet 2, and one end of the connector strip 4 is flush with the side of the tube sheet 2 located inside the housing 1. A connector groove 31 is formed on the outer annular wall of the electric heating tube 3 along its length direction, and one end of the connector groove 31 is flush with the end of the electric heating tube 3 located outside the housing 1. Several connector grooves 31 are provided on the electric heating tube 3, and each connector groove 31 corresponds to a number of connector strips 4 and is inserted and engaged.

[0034] Reference Figure 3 The tube sheet 2 has several mounting grooves 23 on one side outside the shell 1. Each mounting groove 23 corresponds to a mounting hole 21 and is coaxially connected. The inner diameter of the mounting groove 23 is larger than the inner diameter of the mounting hole 21, and smaller than the inner diameter of the welding groove 22. A welding repair ring 7 is inserted into the mounting groove 23. One side of the welding repair ring 7 extends to the outside of the tube sheet 2, and the inner ring wall of the welding repair ring 7 is fitted to the outer ring wall of the electric heating tube 3.

[0035] Reference Figure 3 A connecting plate 6 is disposed on the side of the tube sheet 2 located inside the housing 1. The connecting plate 6 has several connection ports 61, each corresponding to an electric heating tube 3. Several support rings 5 ​​are connected to the side of the connecting plate 6 away from the tube sheet 2. Each support ring 5 corresponds to and communicates with one of the connection ports 61. The inner ring wall of the support ring 5 is fitted against the outer ring wall of the corresponding electric heating tube 3. An abutment ring 8 is connected to the outer ring wall of the electric heating tube 3. A contact ring groove 81 is formed on the side of the abutment ring 8 near the support ring 5, and one end of the support ring 5 is embedded in the corresponding contact ring groove 81.

[0036] Reference Figure 2 A plurality of insertable arc plates 62 are connected to the side of the connecting plate 6 facing the tube plate 2. A plurality of insertable arc grooves 24 are formed on the edge of the tube plate 2, and the plurality of insertable arc grooves 24 correspond one-to-one with the plurality of insertable arc plates 62 and are inserted into each other. The outer arc wall of the insertable arc plate 62 is flush with the peripheral wall of the tube plate 2. The insertable arc plate 62 and the tube plate 2 are connected by connecting bolts 63. In this embodiment, the connecting bolts 63 used are countersunk bolts.

[0037] Reference Figure 2-3 Before welding, the connecting plate 6 is first attached to one side of the tube sheet 2. The insertion arc plate 62 and the insertion arc groove 24 are designed so that the several support rings 5 ​​can correspond one-to-one with the several mounting holes 21 on the tube sheet 2, which facilitates the installation of the connecting plate 6 by the operator. Since the outer arc wall of the insertion arc plate 62 is flush with the peripheral wall of the tube sheet 2, there are no protruding structures on the peripheral wall of the tube sheet 2, which facilitates the connection of the tube sheet 2 with other structures in subsequent operations.

[0038] Reference Figure 3 The electric heating tubes 3 are passed one by one through the corresponding mounting holes 21 on the tube sheet 2 until the abutment ring 8 abuts against one end of the support ring 5. The abutment ring 8 limits the insertion depth of the electric heating tubes 3, which helps to improve the processing accuracy of the electric heater. At the same time, several insertion strips 4 are inserted into several insertion slots 31 on the electric heating tubes 3, realizing a stable connection between the electric heating tubes 3 and the tube sheet 2. According to different welding requirements, the corresponding welding ring 7 is sleeved on the electric heating tube 3 and embedded in the mounting ring groove 23.

[0039] Reference Figure 3 During the welding process, a tubular welding torch is fitted onto the corresponding electric heating tube 3, and the torch heats and melts the connection between the electric heating tube 3 and the tube sheet 2. The metal between the welding ring groove 22 and the mounting hole 21 melts, and simultaneously, the repair welding ring 7 embedded in the mounting ring groove 23 also melts. The addition of the repair welding ring 7 increases the area of ​​the welding area, and the addition of the mounting ring groove 23 increases the connection area between the repair welding ring 7 and the tube sheet 2, improving the connection stability between the two. The molten metal seeps into the gap between the mounting hole 21 and the electric heating tube 3, as well as the gap between the connector strip 4 and the connector groove 31, which helps to stabilize the connection during subsequent solidification. Since the length of the connector strip 4 is greater than the thickness of the tube sheet 2, the portion of the connector strip 4 extending out of the tube sheet 2 melts synchronously during the welding process, further improving the connection stability between the electric heating tube 3 and the tube sheet 2. The support ring 5 supports the electric heating tube 3, reducing the possibility of deformation at the connection point between the electric heating tube 3 and the tube sheet 2 under pressure. For electric heating tubes 3 of different diameters, a connecting plate 6 with a corresponding diameter support tube can be replaced and connected to the tube plate 2, thus expanding the applicability of the device.

[0040] The implementation principle of an electric heater based on deep-hole wire-addition welding in this embodiment is as follows: During the welding process, the welding torch heats and melts the connection between the electric heating tube 3 and the tube sheet 2. The metal between the welding ring groove 22 and the mounting hole 21 melts, and at the same time, the repair welding ring 7 embedded in the mounting ring groove 23 also melts. The setting of the repair welding ring 7 increases the area of ​​the welding part and improves the connection stability between the two. The molten metal seeps into the gap between the mounting hole 21 and the electric heating tube 3, as well as the gap between the plug strip 4 and the plug groove 31, which helps to stabilize the connection during subsequent solidification.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electric heater based on deep-hole wire-adding welding, characterized in that: The device includes an electric heater body, which comprises a housing (1), a tube sheet (2), and electric heating tubes (3). One end of the housing (1) is open, and the tube sheet (2) is connected to the open end of the housing (1). Several electric heating tubes (3) are arranged parallel to each other in the housing (1). The electric heating tubes (3) pass through the tube sheet (2) and are perpendicularly connected to it. Several mounting holes (21) are provided on the tube sheet (2) for the electric heating tubes (3) to pass through. Several welding annular grooves are provided on the side of the tube sheet (2) outside the housing (1). (22) The welding ring groove (22) corresponds to and is coaxially arranged with a plurality of mounting holes (21). The inner diameter of the welding ring groove (22) is larger than the inner diameter of the mounting hole (21). A plurality of insertion grooves (31) are provided on the outer ring wall of the electric heating tube (3) along its length direction. A plurality of insertion strips (4) are connected on the inner wall of the mounting hole (21). One end of the insertion groove (31) extends to the end of the electric heating tube (3) located outside the housing (1). A plurality of insertion strips (4) correspond to and are inserted into the plurality of insertion grooves (31).

2. An electric heater based on deep hole wire bonding according to claim 1, characterized in that: The length of the connector strip (4) is greater than the thickness of the tube sheet (2), and one end of the connector strip (4) is flush with the side of the tube sheet (2) located in the inner cavity of the housing (1).

3. An electric heater based on deep hole wire bonding according to claim 1, characterized in that: The tube sheet (2) is connected to a plurality of support rings (5) on one side of the inner cavity of the housing (1). The plurality of support rings (5) correspond one-to-one with the plurality of mounting holes (21) and are connected in a manner. The inner wall of the support ring (5) is fitted to the outer ring wall of the corresponding electric heating tube (3).

4. An electric heater based on deep hole wire bonding according to claim 3, characterized in that: An abutment ring (8) is connected to the outer ring wall of the electric heating tube (3), and one side of the abutment ring (8) abuts against one end of the support ring (5).

5. An electric heater based on deep hole wire bonding according to claim 2, characterized in that: The tube sheet (2) is provided with a plurality of welding rings (7) on one side outside the shell (1). The plurality of welding rings (7) correspond one-to-one with the plurality of electric heating tubes (3). The inner ring wall of the welding ring (7) is fitted to the outer ring wall of the electric heating tube (3).

6. An electric heater based on deep hole wire bonding according to claim 5, characterized in that: The tube sheet (2) has a plurality of mounting ring grooves (23) on one side outside the housing (1). The plurality of mounting ring grooves (23) correspond one-to-one with the plurality of mounting holes (21) and are connected. One side of the repair welding ring (7) is embedded in the mounting ring groove (23), and the other side of the repair welding ring (7) extends to the outside of the tube sheet (2).

7. An electric heater based on deep-hole wire-adding welding according to claim 4, characterized in that: The tube sheet (2) is provided with a connecting plate (6) on one side inside the shell (1). The connecting plate (6) has a plurality of connecting ports (61). The support rings (5) are connected to the connecting plate (6). One end of each of the support rings (5) corresponds to and is connected to the connecting port (61).

8. An electric heater based on deep hole wire bonding according to claim 7, characterized in that: The connecting plate (6) has several plug-in arc plates (62) connected circumferentially on its side, and the tube plate (2) has several plug-in arc grooves (24) opened circumferentially on its side. The plug-in arc plates (62) and the plug-in arc grooves (24) correspond one-to-one and are plugged in. The plug-in arc plates (62) are connected to the tube plate (2) through connectors. The outer arc wall of the plug-in arc plate (62) is flush with the peripheral wall of the tube plate (2).

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