Special high-temperature-resistant stainless steel electric heating tube

Abstract

The utility model relates to the technical field of electric heating tubes, in particular to a special high-temperature-resistant stainless steel electric heating tube, which comprises an outer tube body, an electric heating wire arranged in the outer tube body, a sleeve arranged on the outer tube body, a filling cavity arranged on the outer tube body, a high-temperature-resistant filling layer arranged in the filling cavity, and an anti-oxidation layer arranged on the high-temperature-resistant filling layer. An external thread is arranged on the sleeve, an inserting groove and an open sinking groove are formed in the sleeve, an electric connector and a connector column are arranged in the inserting groove, a locking clamping groove and an electric sleeve groove are formed in the connector column, an inner screw hole is formed in the open sinking groove, a locking screw pin is arranged in the inner screw hole, an inner hexagonal groove is formed in the locking screw pin, an anti-loosening head is arranged on the locking screw pin, and an arc-shaped surface is arranged on the anti-loosening head. The high temperature resistance and oxidation resistance of the outer pipe body on the stainless steel electric heating pipe are improved, and the replaceability between the connector column on the stainless steel electric heating pipe and the electric heating wire is achieved.

Description

Technical Field

[0001] This utility model relates to the field of electric heating tube technology, and in particular to a special high-temperature resistant stainless steel electric heating tube. Background Technology

[0002] Stainless steel electric heating tubes are electrical components that convert electrical energy into heat energy. They are widely used in industrial equipment, household appliances, pharmaceutical machinery, electroplating equipment, cigarette machinery and other fields.

[0003] A stainless steel electric heating element typically consists of an outer stainless steel tube containing a pre-installed heating wire. Positive and negative terminals are located at both ends of the tube, and sleeves with external threads are fitted over these terminals. The positive and negative terminals connect to the two ends of the heating wire within the tube. The heating element is then connected to the positive and negative terminals of an external power source via these terminals to achieve the desired heating effect.

[0004] Currently, existing stainless steel electric heating tubes have relatively weak high-temperature resistance and oxidation resistance in their outer tube body.

[0005] In addition, when installing existing stainless steel electric heating tubes, the sleeve of the stainless steel electric heating tube is usually passed through the preset mounting hole on the mounting plate, and then locked with a nut to the external thread of the sleeve. However, the positive and negative terminals are prone to aging after long-term use, and they are usually directly welded to the two ends of the electric heating wire, so they cannot be replaced. This greatly reduces the replaceability of the positive and negative terminals of the stainless steel electric heating tube to the electric heating wire. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a special high-temperature resistant stainless steel electric heating tube.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] Design a special high-temperature resistant stainless steel electric heating tube, including an outer tube body, an electric heating wire disposed inside the outer tube body, a sleeve disposed on the outer tube body, a filling cavity formed on the outer tube body, a high-temperature resistant filling layer disposed inside the filling cavity, an anti-oxidation layer disposed on the high-temperature resistant filling layer, an external thread provided on the sleeve, a plug groove and an open countersunk groove formed on the sleeve, an electric connector and a connector post disposed in the plug groove, and a locking groove and an electric sleeve groove formed on the connector post;

[0009] The open countersink is provided with an internal threaded hole, and a locking pin is provided in the internal threaded hole. The locking pin is provided with an internal hexagonal groove.

[0010] The locking pin is provided with an anti-loosening head, the anti-loosening head is provided with an arc-shaped surface, and the locking groove is provided with a damping layer.

[0011] Furthermore, the high-temperature resistant filling layer is filled in the filling cavity, and the high-temperature resistant filling layer is boron nitride filling particles.

[0012] Furthermore, the antioxidant layer is uniformly disposed along the outer wall surface of the high-temperature resistant filler layer, and the antioxidant layer is a nickel-molybdenum alloy plate structure.

[0013] Furthermore, the electric sleeve groove is opened at the left end of the connector post and is tightly sleeved with the electric connector, and the left end of the electric connector is fixedly set with the electric heating wire.

[0014] Furthermore, the internal threaded hole is vertically positioned in the open recess and communicates with the insertion slot, and the locking pin is threadedly connected to the internal threaded hole and engages with the locking slot.

[0015] Furthermore, the anti-loosening head is inserted into the locking groove, and the locking pin is not higher than the opening recess.

[0016] Furthermore, the damping layer is uniformly coated along the inner wall of the locking groove, and the locking groove is not connected to the electrical sleeve groove.

[0017] The special high-temperature resistant stainless steel electric heating tube proposed in this utility model has the following advantages:

[0018] 1. This utility model improves the high temperature resistance and oxidation resistance of the outer tube of the stainless steel electric heating tube by opening a filling cavity on the outer tube body, setting a high temperature resistant filling layer in the filling cavity, and then setting an anti-oxidation layer structure on the high temperature resistant filling layer.

[0019] 2. This utility model provides a plug groove with an electrical connector on the sleeve and an open countersunk groove with an internal threaded hole on the sleeve. A locking pin is then placed in the internal threaded hole. At the same time, corresponding electrical sleeve grooves and locking grooves are provided on the connector post. After long-term use, if the connector post ages, the aged connector post can be removed from one end of the electric heating wire inside the sleeve, and then a new connector post can be installed. This achieves the replaceability of the connector post and the electric heating wire on the stainless steel electric heating tube. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model in its uninstalled state.

[0021] Figure 2This is a partial three-dimensional schematic diagram of the overall structure of this utility model in its installed state;

[0022] Figure 3 For the present utility model Figure 1 A three-dimensional schematic diagram of the inner and outer tubes;

[0023] Figure 4 For the present utility model Figure 3 Enlarged cross-sectional view of the middle HH section;

[0024] Figure 5 For the present utility model Figure 1 A three-dimensional schematic diagram of the central joint column;

[0025] Figure 6 For the present utility model Figure 1 A three-dimensional schematic diagram of the central locking pin.

[0026] In the diagram: 1 Outer tube; 11 Heating wire; 2 Sleeve; 21 External thread; 22 Insert groove; 221 Electrical connector; 3 Open countersunk groove; 31 Internal threaded hole; 4 Connector post; 41 Locking groove; 411 Damping layer; 42 Electrical sleeve groove; 5 Locking pin; 51 Internal hexagonal groove; 6 Anti-loosening head; 61 Arc-shaped surface; 7 Filling cavity; 71 High-temperature resistant filling layer; 8 Anti-oxidation layer. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Reference Figure 1-6 A special high-temperature resistant stainless steel electric heating tube includes an outer tube body 1, an electric heating wire 11 disposed inside the outer tube body 1, a sleeve 2 disposed on the outer tube body 1, a filling cavity 7 opened on the outer tube body 1, a high-temperature resistant filling layer 71 disposed inside the filling cavity 7, an anti-oxidation layer 8 disposed on the high-temperature resistant filling layer 71, an external thread 21 disposed on the sleeve 2, a plug groove 22 and an open countersunk groove 3 opened on the sleeve 2, an electric connector 221 and a connector post 4 disposed inside the plug groove 22, and a locking groove 41 and an electric sleeve groove 42 opened on the connector post 4;

[0029] An internal threaded hole 31 is provided on the open countersink 3, and a locking pin 5 is provided in the internal threaded hole 31. The locking pin 5 is provided with an internal hexagonal groove 51.

[0030] The locking pin 5 is provided with an anti-loosening head 6, and the anti-loosening head 6 is provided with an arc-shaped surface 61. The locking groove 41 is provided with a damping layer 411. The outer tube 1, the electric heating wire 11, and the sleeve 2 are the common structures of stainless steel electric heating tubes, which are existing technologies. Some existing structures are not drawn and labeled, so there is no need to elaborate.

[0031] The locking pin 5 is made of hard plastic steel, which is insulated and durable.

[0032] The curved surface 61 improves the smoothness of the locking pin 5 entering the locking slot 41.

[0033] A high-temperature resistant filling layer 71 is filled in the filling cavity 7. The high-temperature resistant filling layer 71 is boron nitride filling particles, which are special filling particle materials with excellent high-temperature resistance, while ensuring the heat transfer effect of electric heating and durability.

[0034] The anti-oxidation layer 8 is uniformly arranged along the outer wall of the high-temperature resistant filling layer 71. The anti-oxidation layer 8 is a nickel-molybdenum alloy plate structure. The nickel-molybdenum alloy plate has a thickness of 80 to 90 micrometers and has excellent anti-oxidation properties and is durable. The nickel-molybdenum alloy plate is uniformly fitted and fixedly wrapped around the outside of the high-temperature resistant filling layer 71, which ensures the heat transfer effect of electric heating, improves the anti-oxidation properties of the outer wall of the outer tube 1, and prevents the high-temperature resistant filling layer 71 from leaking out.

[0035] The electrical sleeve 42 is located at the left end of the connector post 4 and is tightly fitted with the electrical connector 221. The left end of the electrical connector 221 is fixedly welded to the heating wire 11. The electrical connector 221 and the connector post 4 are made of copper. In actual use, the right end of the connector post 4 is clamped by a pre-set connector clamp. The connector clamp is connected to an external power source through a wire. After power is applied, the current is conducted to the connector post 4, the electrical connector 221 and the fixedly welded heating wire 11 through the wire and the connector clamp, and then led out from the connector post 4 at the other end, thus forming a current loop, thereby realizing the electric heating effect of the heating wire 11 (the electric heating principle is existing technology).

[0036] The internal threaded hole 31 is vertically set in the open recess 3 and communicates with the insertion groove 22. The locking pin 5 is threadedly connected to the internal threaded hole 31 and is engaged with the locking groove 41. When the locking pin 5 is removed from the locking groove 41, the locking pin 5 is still in the threaded connection state with the internal threaded hole 31, thus preventing the locking pin 5 from being lost.

[0037] The anti-loosening head 6 is squeezed and inserted into the locking groove 41. The anti-loosening head 6 is made of NBR nitrile rubber, which has high elasticity, wear resistance and durability. When the locking pin 5 is inserted into the locking groove 41, the anti-loosening head 6 itself will squeeze and generate vertical rebound force. This vertical rebound force acts on the locking pin 5, which has the effect of preventing the threads from loosening.

[0038] The locking pin 5 should not be higher than the opening countersunk groove 3 to avoid protrusion and damage from foreign objects.

[0039] The damping layer 411 is uniformly coated along the inner wall of the locking groove 41. The damping layer 411 is a silicone coating with excellent damping friction elasticity. It can make damping friction contact with the outer wall of the locking pin 5, further improving the anti-loosening performance of the locking pin 5.

[0040] The locking slot 41 is not connected to the electrical sleeve slot 42, thus achieving electrical insulation and isolation between the electrical sleeve slot 42 and the electrical connector 221.

[0041] Working method: By opening a filling cavity 7 on the outer tube body 1, setting a high temperature resistant filling layer 71 in the filling cavity 7, and then setting an anti-oxidation layer 8 structure on the high temperature resistant filling layer 71, the overall high temperature resistance and anti-oxidation of the outer tube body 1 of the stainless steel electric heating tube are improved.

[0042] In addition, after prolonged use, the connector post 4 may age and need to be replaced. To replace it, insert an Allen wrench into the Allen socket 51 and turn it counterclockwise. This will cause the locking pin 5 to rotate counterclockwise. Through the thread transmission between the internal thread holes 31, the locking pin 5 will move upwards and exit the locking slot 41. Then, move the connector post 4 to the right and exit the insertion slot 22 to remove the aged connector post 4. Then, take a new connector post 4 and insert it into the insertion slot 22, ensuring that the electrical sleeve slot 42 and the electrical connector 221 are tightly fitted together. Simultaneously, ensure that the locking slot 41 and the locking pin 5 are aligned. Next, turn the Allen wrench clockwise to cause the locking pin 5 to rotate clockwise and engage in the locking slot 41. This allows for the stable installation and replacement of the new connector post 4, achieving replaceability between the connector post 4 and the heating wire 11 on the stainless steel electric heating tube.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A special high-temperature resistant stainless steel electric heating tube, comprising an outer tube body (1), characterized in that: An electric heating wire (11) is provided inside the outer tube (1). A sleeve (2) is provided on the outer tube (1). A filling cavity (7) is provided on the outer tube (1). A high-temperature resistant filling layer (71) is provided inside the filling cavity (7). An anti-oxidation layer (8) is provided on the high-temperature resistant filling layer (71). An external thread (21) is provided on the sleeve (2). A plug groove (22) and an open countersunk groove (3) are provided on the sleeve (2). An electric connector (221) and a connector post (4) are provided inside the plug groove (22). A locking groove (41) and an electric sleeve groove (42) are provided on the connector post (4). The open recess (3) is provided with an internal threaded hole (31), and a locking pin (5) is provided in the internal threaded hole (31). The locking pin (5) is provided with an internal hexagonal groove (51). The locking pin (5) is provided with an anti-loosening head (6), the anti-loosening head (6) is provided with an arc-shaped surface (61), and the locking groove (41) is provided with a damping layer (411).

2. The special high-temperature resistant stainless steel electric heating tube according to claim 1, characterized in that: The high-temperature resistant filling layer (71) is filled in the filling cavity (7), and the high-temperature resistant filling layer (71) is boron nitride filling particles.

3. The special high-temperature resistant stainless steel electric heating tube according to claim 1, characterized in that: The antioxidant layer (8) is uniformly arranged along the outer wall of the high-temperature resistant filler layer (71), and the antioxidant layer (8) is a nickel-molybdenum alloy plate structure.

4. A special high-temperature resistant stainless steel electric heating tube according to claim 1, characterized in that: The electric sleeve groove (42) is opened at the left end of the connector post (4) and is tightly sleeved with the electric connector (221). The left end of the electric connector (221) is fixedly set with the electric heating wire (11).

5. A special high-temperature resistant stainless steel electric heating tube according to claim 1, characterized in that: The internal threaded hole (31) is vertically set in the open recess (3) and communicates with the insertion groove (22). The locking pin (5) is threadedly connected to the internal threaded hole (31) and engages with the locking groove (41).

6. A special high-temperature resistant stainless steel electric heating tube according to claim 1, characterized in that: The anti-loosening head (6) is pressed and inserted into the locking groove (41), and the locking screw (5) is not higher than the opening recess (3).

7. A special high-temperature resistant stainless steel electric heating tube according to claim 1, characterized in that: The damping layer (411) is uniformly coated along the inner wall of the locking groove (41), and the locking groove (41) is not connected to the electrical sleeve groove (42).

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