Sheath type conduction oil electric heater

Abstract

The utility model relates to a sheath type conduction oil electric heater comprising a heating pipe, and one end of the heating pipe is fixedly provided with a connector lug; a sheath is further arranged outside the heating pipe, a connecting flange is arranged at the end, close to the connector lug, of the sheath, and the connector lug is connected with the connecting flange. An oil outlet is formed in the bottom of the connecting flange, a valve is arranged on the oil outlet, a buffer cavity is formed in the top of the connecting flange, an oil injection port is formed in the top of the buffer cavity, and a breather valve is further arranged on the oil injection port; the beneficial effects of the utility model are that through the arrangement of the buffer cavity, the volume of the heat-conducting oil increased after expansion in the heating process can be effectively accommodated, thereby reducing the internal pressure of the sheath, preventing the sheath from being broken or deformed due to overlarge pressure, and improving the safety performance of equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of heaters, in particular to a sheathed thermal oil electric heater. Background Art

[0002] Sheathed electric heaters are a common type of electric heating equipment, widely used in industrial and household fields. Its basic structure includes an electric heating tube surrounded by a sheath, which is usually made of metal material to provide mechanical protection and heat transfer; in the traditional sheathed electric heater design, in order to improve the heat transfer efficiency and extend the practical life of the heating tube, the sheath is usually filled with thermal oil. Thermal oil has better thermal conductivity than air, so it can transfer heat from the heating tube to the sheath faster, and then from the sheath to the external medium; however, this design has certain limitations. The thermal oil will expand during the heating process, which may lead to several problems. First, the expansion of the thermal oil may increase the pressure in the sheath, thereby threatening the structural integrity of the sheath. Long-term high pressure may cause the sheath to deform or rupture, which not only affects the service life of the heater, but also may cause safety hazards. Utility Model Content

[0003] In order to overcome the above-mentioned deficiencies of the existing problems, the utility model provides a sheathed thermal oil electric heater, which effectively solves the problem caused by the expansion of the thermal oil.

[0004] The technical solution adopted by the utility model to solve its technical problems is a sheathed thermal oil electric heater, comprising a heating tube, one end of which is fixedly provided with a terminal head; a sheath is further provided on the outside of the heating tube, and an end of the sheath close to the terminal head is provided with a connecting flange, and the terminal head is connected to the connecting flange; an oil outlet is provided at the bottom of the connecting flange, a valve is provided on the oil outlet, and a buffer chamber for accommodating the expansion of the thermal oil is also provided at the top of the connecting flange, an oil filling port is provided at the top of the buffer chamber, and a breathing valve is also provided on the oil filling port.

[0005] Preferably, the terminal head includes a terminal block arranged at one end of the heating tube, the terminal block is further provided with a protective shell for protecting the terminal block, and the protective shell is further provided with a protective cover.

[0006] Preferably, the heating tube is further provided with a clamp.

[0007] The beneficial effect of the present invention is that, through the setting of the buffer chamber, the volume of the heat transfer oil increased after expansion during the heating process can be effectively accommodated, thereby reducing the pressure inside the sheath, avoiding the sheath from rupture or deformation due to excessive pressure, and improving the safety performance of the equipment; the setting of the oil outlet and the oil filling port allows the operator to easily discharge the old heat transfer oil and inject new heat transfer oil without disassembling the entire heater or performing complicated operations; the setting of the protective shell of the terminal head can effectively protect the terminal board and ensure the stable operation of the heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0009] Figure 1 It is a structural diagram of the present utility model.

[0010] In the figure, 1. heating tube; 2. terminal head; 21. terminal board; 22. protective shell; 23. protective cover; 3. sheath; 4. connecting flange; 5. oil outlet; 51. valve; 6. buffer chamber; 7. oil filling port; 8. breathing valve; 9. clamp. DETAILED DESCRIPTION

[0011] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0012] Any feature disclosed in this specification (including any appended claims, abstract, and drawings), unless otherwise stated, may be replaced by other equivalent or similar features. In other words, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0013] A sheathed thermal oil electric heater, comprising a heating tube 1, one end of which is fixedly provided with a terminal head 2; a sheath 3 is further provided on the outside of the heating tube 1, which is used to provide certain protection for the heating tube 1, preventing the heating tube 1 from direct contact with some flammable liquids, and is used to transfer heat; a connecting flange 4 is provided on one end of the sheath 3 close to the terminal head 2, the connecting flange 4 and the sheath 3 are an integral structure, and the terminal head 2 is connected to the connecting flange 4; an oil outlet 5 is provided at the bottom of the connecting flange 4, and a valve 51 is provided on the oil outlet 5, and the oil outlet 5 is provided at the connecting flange 4. At the bottom, the heat transfer oil can be discharged by opening the valve 51; the top of the connecting flange 4 is also provided with a buffer chamber 6 for accommodating the expansion of the heat transfer oil, which can effectively accommodate the expansion of the heat transfer oil during the heating process, thereby reducing the pressure inside the jacket 3 and avoiding the jacket 3 from being broken or deformed due to excessive pressure. The top of the buffer chamber 6 is provided with an oil filling port 7, and the heat transfer oil can be added through the oil filling port 7. The oil filling port 7 is also provided with a breathing valve 8, which allows the gas in the jacket 3 to escape when the heat transfer oil expands, and enter when the heat transfer oil contracts, thereby maintaining the pressure balance inside and outside the jacket 3.

[0014] The terminal head 2 includes a terminal block 21 arranged at one end of the heating tube 1. A protective shell 22 is also provided on the terminal block 21 to protect the terminal block 21 from the influence of the external environment; a protective cover 23 is also provided on the protective shell 22. The protective cover 23 is easy to disassemble, making the inspection and maintenance of the terminal block more convenient.

[0015] The heating tube 1 is also provided with a clamp 9, which is used to fix the heating tube 1 to prevent it from deforming during the heating process or due to other reasons. This fixing effect ensures that the heating tube can be stably placed in the sheath 3.

[0016] During practical use, the heat transfer oil is injected into the sheath 3 through the oil filling port 7; during the heating process, when the heating tube 1 starts to work, the heat transfer oil is heated and the temperature rises. Since the volume of the heat transfer oil expands with the increase in temperature, the internal pressure of the sheath 3 increases. When the heat transfer oil expands, the excess heat transfer oil will flow into the buffer cavity 6, thereby reducing the pressure on the sheath 3.

[0017] This design is ingenious. The buffer chamber 6 can effectively accommodate the increased volume of the heat transfer oil after expansion during the heating process, thereby reducing the pressure inside the sheath 3, avoiding the sheath 3 from rupture or deformation due to excessive pressure, and improving the safety performance of the equipment; the setting of the oil outlet 5 and the oil filling port 7 allows the operator to easily drain the old heat transfer oil and inject new heat transfer oil without disassembling the entire heater or performing complicated operations; the setting of the protective shell 22 can effectively protect the terminal block 21, prevent electrical connection failures caused by external factors such as moisture, dust, etc., and ensure the stable operation of the heater.

[0018] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A sheathed thermal oil electric heater, characterized by: The invention comprises a heating tube (1), wherein a terminal head (2) is fixedly provided at one end of the heating tube (1); a sheath (3) is further provided on the outside of the heating tube (1); a connecting flange (4) is provided at one end of the sheath (3) close to the terminal head (2); the terminal head (2) is connected to the connecting flange (4); an oil outlet (5) is provided at the bottom of the connecting flange (4); a valve (51) is provided on the oil outlet (5); a buffer chamber (6) for accommodating the expansion of the heat transfer oil is further provided at the top of the connecting flange (4); an oil filling port (7) is provided at the top of the buffer chamber (6); a breathing valve (8) is further provided on the oil filling port (7).

2. The sheathed thermal oil electric heater according to claim 1, characterized in that: The terminal head (2) comprises a terminal block (21) arranged at one end of the heating tube (1); a protective shell (22) for protecting the terminal block (21) is further provided on the terminal block (21); and a protective cover (23) is further provided on the protective shell (22).

3. The sheathed thermal oil electric heater according to claim 1, characterized in that: The heating tube (1) is also provided with a clamp (9).

Images