Electric heating knife with knife seat heat dissipation air duct structure

Abstract

The application discloses an electric heating knife with a knife seat heat dissipation air duct structure, which comprises a machine shell, a handle is formed at the rear of the machine shell, and a knife seat mounting seat for fixedly connecting with the knife seat is arranged at the front end of the machine shell; the knife seat mounting seat comprises upper and lower side walls; upper and lower positioning ribs are arranged on the upper and lower side walls, and spaces for clamping the upper and lower side surfaces of the knife seat are formed between the upper and lower positioning ribs through cooperation of the upper and lower positioning ribs on the machine shell; upper and lower heat dissipation air ducts capable of passing through air are formed between the upper and lower side walls of the knife seat mounting seat and the upper and lower side surfaces of the knife seat, and the upper and lower heat dissipation air ducts form end portion air outlet windows at the end portions of the knife seat mounting seat. Through arrangement of the heat dissipation air duct on the knife seat mounting seat, the heat of the circuit board and the transformer coil can be discharged, more importantly, the high temperature on the knife seat can be discharged to the outside, the machine shell can be avoided from being encrusted, and the service life and experience of the electric heating knife are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of electrothermal knife technology, and particularly relates to an electrothermal knife with a heat dissipation air duct structure for the knife holder. Background Technology

[0002] An electrothermal knife is a handheld tool that uses resistance heating to achieve cutting. Currently, most high-power electrothermal knives on the market have internal cooling fans, primarily for cooling the circuit board to prevent damage to electronic components and for cooling the transformer coil to prevent power reduction due to overheating. Chinese utility model patent CN206042642U discloses an actively cooling handheld electrothermal knife. This knife has a cooling fan located inside the body or on its casing, near the circuit board inside the knife body, to cool the electronic components on the circuit board; a cooling fan is also located inside the casing near the transformer coil to cool it. The casing also has ventilation holes. This patent demonstrates that by incorporating cooling fans and ventilation holes, the electrothermal knife can be cooled, improving its lifespan. However, based on long-term experimental testing and user feedback, new problems have emerged with this electrothermal knife.

[0003] Currently, most electrothermal knives use nylon for their housings, with the blade holder secured by nylon positioning ribs in a closed, enclosed manner. Although the electrothermal knife body has an internal cooling fan, its design, based on actual layout analysis, aims to prevent it from affecting the heat dissipation of the blade holder. Most existing electrothermal knives suffer from a failure to effectively dissipate heat from the blade holder.

[0004] Current technology merely blows the heat from the components on the circuit board and the transformer coils to the outside of the casing, and the tool holder is fixed in a closed manner, isolating it from the heat-generating transformer coils. There are no cooling ducts or exhaust windows at the tool holder, so the heat from the tool holder cannot be directly discharged outside the casing.

[0005] like Figure 1 As shown, the positioning and heat dissipation solutions for the tool holder in the existing technology have defects. When the electrothermal knife machine is working, the temperature on the electrothermal blade is very high, and the temperature transferred to the tool holder is significantly higher than the temperature dissipated by the circuit board and transformer coils during operation. The enclosed positioning method of the tool holder means that the cool air blown out by the cooling fan cannot significantly dissipate heat from the tool holder. The cool air is exhausted to the outside through the ventilation holes on both sides of the transformer coil, which only has a cooling effect on the circuit board and transformer coils. The cooling effect on the very hot tool holder is negligible.

[0006] Analysis revealed that the cutting blade of the electrothermal knife can reach temperatures of approximately 600 degrees Celsius. During prolonged operation, the heat from the blade is transferred to the metal blade holder, which is fixed in place by a nylon housing. The heat distortion temperature of nylon is around 150 degrees Celsius over extended use. Therefore, the housing at the blade holder is prone to scorching under prolonged high temperatures, and in severe cases, the housing may melt, rendering the electrothermal knife unusable. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides an improved electrothermal knife with a heat dissipation channel on the blade holder, which also has a significant heat dissipation effect on the high temperature on the blade holder, thus avoiding the problem of the casing melting and rendering the entire electrothermal knife tool unusable.

[0008] To achieve the above objectives, the technical solution adopted in this invention is as follows: by reducing the temperature of the two blade holders on the working head of the electrothermal knife body, the positioning ribs made of plastic that fixes the blade holders and the plastic parts around the blade holders are prevented from being scorched and melted. Specifically, the cooling air blown out by the built-in cooling fan inside the electrothermal knife body blows the heat from the two hot metal blade holders inside the casing to the outside of the casing.

[0009] Includes a housing, with a handle formed at the rear of the housing and a tool holder mounting base at the front of the housing for fixed connection with the tool holder;

[0010] The tool holder mounting base includes upper and lower side walls, and upper and lower positioning ribs are provided on the upper and lower side walls; through the cooperation of the upper and lower positioning ribs of the housing, a space is formed between the upper and lower positioning ribs to clamp the upper and lower sides of the tool holder.

[0011] The upper and lower side walls of the tool holder mounting base and the upper and lower sides of the tool holder form upper and lower heat dissipation channels that allow air to pass through. The upper and lower heat dissipation channels form end air outlet windows at the ends of the tool holder mounting base.

[0012] By using partial contact positioning with upper and lower positioning ribs, and with a partially elevated blade holder at the front of the machine housing, multiple upper and lower heat dissipation channels are formed to allow hot air to pass through. The heat from the metal blade holder is exhausted to the outside of the machine through the existing cooling fan inside the electric hot knife. This significantly reduces the temperature of the metal blade holder, and also greatly reduces the temperature of the positioning ribs and nearby plastic parts, preventing them from softening, burning, or melting.

[0013] Furthermore, to provide more heat dissipation ducts in the housing section at the tool holder, upper and lower side air outlets are also provided on the upper and lower sides of the tool holder corresponding to the positions of the upper and lower heat dissipation ducts. The cooling fan uses the air outlets at the end of the tool holder and the air outlets on the upper and lower sides of the tool holder to exhaust the heat generated by the circuit board, transformer coils, and the two tool holders through the heat dissipation ducts to the outside of the housing through multiple air outlets.

[0014] Furthermore, the upper and lower positioning ribs include at least two, and the tool holder has a stepped surface, which is engaged on at least one side of the upper and lower positioning ribs to restrict the movement of the tool holder in the front-back direction.

[0015] Furthermore, the left and right sidewalls of the tool holder mounting base are provided with left and right positioning ribs for clamping the left and right sides of the tool holder; between the upper and lower sidewalls, along the extension direction of the left and right positioning ribs, left and right heat dissipation channels are formed, allowing air to pass through. Left and right side air outlet windows are formed on the left and right outer sidewalls of the tool holder mounting base near the outer side of the housing, corresponding to the positions of the left and right heat dissipation channels. The left and right positioning ribs that clamp the left and right sides of the tool holder are positioned by partial contact, forming at least two left and right heat dissipation channels for air to pass through. The left and right heat dissipation channels form left and right side air outlet windows on the left and right sidewalls of the tool holder mounting base, dissipating the heat of the tool holder to the outside and reducing the temperature of the plastic parts of the left and right sidewalls and left and right positioning ribs, preventing them from burning or melting.

[0016] Preferably, when the left and right positioning ribs are simultaneously set opposite each other from the upper and lower side walls, a gap is left between the opposite left and right positioning ribs to allow air to pass through.

[0017] Furthermore, at least two tool holder mounting bases are arranged side by side, with a gap between the adjacent left and right inner sidewalls of the tool holder mounting bases; this forms a central heat dissipation airflow channel, and corresponding to the position of the central heat dissipation airflow channel, upper and lower side air outlet windows are provided on the upper and lower sidewalls of the housing. This design further increases the heat dissipation channel, which is beneficial for dissipating the heat generated by the circuit board and transformer coils to the outside of the housing.

[0018] Furthermore, the inner sidewalls of the two tool holders, which are close to each other, are partially hollowed out, allowing the inner sidewalls of the two tool holders to connect with the central heat dissipation channel. This allows the metal body of the tool holder to come into contact with the air in the central space, dissipating the heat of the metal body into the central heat dissipation channel and then exhausting it to the outside through small upper and lower side air outlets. The hollowed-out positions are located on the inner sidewalls of the two tool holders, or the hollowed-out positions can be located below the positions where the tool holders are clamped. This serves to connect the upper and lower heat dissipation channels with the space formed by the central heat dissipation channel of these two inner sidewalls.

[0019] Furthermore, in order to improve the structural strength of the electric hot knife, reinforcing ribs are provided on the opposing surfaces of the left and right inner sidewalls of the two knife holder mounting bases that are close to each other.

[0020] Furthermore, to reduce the resistance of the airflow from the heat dissipation duct, the sides of the upper and lower positioning ribs are chamfered or rounded. When reinforcing ribs are present, the sides of the upper and lower positioning ribs and / or the reinforcing ribs are chamfered or rounded. When left and right positioning ribs are present, the sides of the upper and lower positioning ribs and / or the left and right positioning ribs and / or the reinforcing ribs are chamfered or rounded.

[0021] Furthermore, an air intake vent is installed at the rear of the housing, and a cooling fan is located inside the housing. The housing also houses the transformer coils and circuit boards, with the cooling fan positioned between the transformer coils and the circuit boards. A cooling duct is only installed at the tool holder mounting location, thus forming a complete air circulation system. This system draws in cool air, removes heat from the circuit boards, blows away heat from the transformer and tool holder, and exhausts hot air, improving operational stability. Comparatively, this technical solution saves costs without compromising heat dissipation.

[0022] Furthermore, the housing of the tool holder positioning seat is made of one of PA6T, PA46, or PA9T. By using high-temperature resistant engineering plastics, the material can more effectively prevent the risk of melting at high temperatures.

[0023] The present invention has the following beneficial effects: By setting multiple heat dissipation air channels on the tool holder mounting position, and various forms of large-area air outlet and air inlet windows, and the reasonable layout of the heat dissipation fan position, the present invention not only dissipates the heat of the circuit board and transformer coil, but more importantly, it can dissipate the high temperature on the tool holder to the outside, which can prevent the casing from condensing and significantly improve the service life and user experience of the electric hot knife. Attached Figure Description

[0024] Figure 1 This is a tool holder structure based on existing technology.

[0025] Figure 2 This is a schematic diagram of the overall structure of the electric hot knife with a heat dissipation air duct structure according to an embodiment of the present invention.

[0026] Figure 3 This is a diagram of the upper and lower heat dissipation air duct structure (lower housing) of an electrothermal knife with a blade holder heat dissipation air duct structure according to an embodiment of the present invention.

[0027] Figure 4 This is a structural diagram of the middle heat dissipation channel (lower housing) of an electrothermal knife with a blade holder heat dissipation channel structure according to an embodiment of the present invention.

[0028] Figure 5 This is a diagram of the left and right heat dissipation air duct structure (lower housing) of an electrothermal knife with a blade holder heat dissipation air duct structure according to an embodiment of the present invention.

[0029] Figure 6 This is a cross-sectional view of the upper and lower heat dissipation channels, upper and lower side and end face air outlet windows of the electric hot knife with a knife holder heat dissipation channel structure according to an embodiment of the present invention.

[0030] Figure 7 This is a cross-sectional view of the middle and left and right heat dissipation channels of an electrothermal knife with a knife holder heat dissipation channel structure according to an embodiment of the present invention.

[0031] Figure 8This is a schematic diagram of the external structure of an electrothermal knife with a heat dissipation air duct structure according to an embodiment of the present invention.

[0032] In the diagram, 1 is the casing, 1-1 is the air inlet window, 2 is the circuit board, 3 is the cooling fan, 4 is the transformer coil, 5 is the tool holder mounting base, 5-1 is the upper and lower cooling air ducts, 5-1-1 is the upper and lower side walls, 5-1-2 is the upper and lower positioning ribs, 5-2 is the left and right cooling air ducts, 5-2-1 is the left and right outer side walls, 5-2-2 is the left and right inner side walls, 5-2-3 is the left and right positioning ribs, 5-3 is the middle cooling air duct, 5-3-1 is the directional reinforcing rib, 5-4 is the end air outlet window, 5-5 is the upper and lower side air outlet windows, 5-6 is the left and right side air outlet windows, 6 is the tool holder, 6-1 is the upper tool holder, and 6-2 is the lower tool holder. Detailed Implementation

[0033] To facilitate understanding by those skilled in the art, the present invention will be further described below in conjunction with embodiments and accompanying drawings.

[0034] like Figure 2 As shown, a technical improvement is made to the existing simple blade holder positioning method of electric hot knife. The rear of the housing 1 is the handle, and the front of the housing 1 is provided with a blade holder mounting base 5 for fixed connection with the blade holder (the housing 1 can be made as a whole, or it can be a housing 1 made separately from components such as the handle and the blade holder mounting base 5). An air duct structure is set at the blade holder 6. The upper and lower positioning ribs 5-1-2 adopt partial contact positioning, and the partially raised blade holder forms two upper and lower heat dissipation air ducts 5-1. The upper and lower heat dissipation air ducts 5-1 form end air outlet windows 5-4 at the end of the blade holder mounting base 5. At the same time, multiple upper and lower side air outlet windows 5-5 are provided on the upper and lower side walls 5-1-1 of the blade holder mounting base 5.

[0035] In addition, the left and right positioning ribs 5-2-3 also adopt partial contact positioning. The left and right positioning ribs 5-2-3 have at least one gap with one upper or lower side wall 5-1-1 of the tool holder mounting base 5, or the left and right positioning ribs 5-2-3 are partially hollowed out, thus partially elevating the tool holder to form four left and right heat dissipation air channels 5-2. The left and right heat dissipation air channels 5-2 are on the left and right sides of the tool holder 6, and left and right side air outlet windows 5-4 are formed on the left and right outer side walls 5-2-1. The side walls of the upper tool holder 6-1 and the lower tool holder 6-2 that are close to each other are the left and right inner side walls 5-2-2. The space between the left and right inner side walls 5-2-2 forms the middle heat dissipation channel 5-3. At least one upper or lower side air outlet window 5-5 is provided on the upper and lower side walls 5-1-1 in this part. The left and right inner side walls 5-2-2 are partially hollowed out, and the two left and right heat dissipation air channels 5-2 that are close to each other on the tool holder 6 are connected to the middle heat dissipation channel 5-3. This allows the metal body of the tool holder 6 to have a larger contact area with the air, reducing the contact area with the plastic part.

[0036] This embodiment uses only one cooling fan 3, which is positioned between the transformer coil 4 and the circuit board 2. Figure 2 As shown, the principle is to absorb the heat from the circuit board 2 while blowing away the heat from the transformer coil. In comparison, this technical solution saves costs without reducing the heat dissipation effect. The existing cooling fan 3 inside the electric hot knife is used to exhaust the heat from the knife holder 6 to the outside of the machine through the upper and lower cooling channels 5-1, left and right cooling channels 5-2, middle cooling channel 5-3, end air outlet 5-4, upper and lower side air outlets 5-5, and left and right side air outlets 5-6. This significantly reduces the temperature of the knife holder 6, and also greatly reduces the temperature of the positioning ribs of the knife holder mounting base 5 and the plastic parts on the nearby side walls, preventing them from softening, burning, or melting.

[0037] An air inlet window 1-1 is provided at the rear of the housing 1, a cooling fan 3 is provided between the transformer coil 4 and the circuit board 2, and multiple heat dissipation ducts and exhaust windows are provided at the tool holder 6. This forms a complete air circulation system that draws in cool air and exhausts hot air, removing heat from the components on the circuit board 2, the transformer coil 4, and the hot tool holder 6, thus improving operational stability. In this embodiment, an air inlet window 1-1 is provided at the rear of the handle housing 1. The area of ​​the window is designed to maximize contact with external air based on the actual shape of the housing, increasing the air intake area and allowing more cool air to be drawn in, which is beneficial for better heat dissipation.

[0038] like Figure 3-8As shown, inside the electric hot knife machine, a cooling fan 3 is installed between the circuit board 2 and the transformer coil 4. An air inlet window 1-1 is installed at the tail of the handle housing 1. On the body of the knife holder mounting base 5, the upper and lower cooling air channels 5-1, the left and right cooling air channels 5-2, the middle cooling air channel 5-3, and the end air outlet window 5-4 are installed at the knife holder 6. Multiple upper and lower side air outlet windows 5-5 are installed on the upper and lower side walls 5-1-1. Left and right side air outlet windows 5-6 are installed on the left and right outer side walls 5-2-1. There are channels on the left and right inner side walls 5-2-2 that communicate with the small upper and lower side air outlet windows 5-5 at the middle cooling channel 5-3. When the electric hot knife is working, the cooling fan 3 is also powered on and operates at the same time. The air at the air inlet window 1-1 is drawn into the machine casing. The cooling fan 3 draws away the heat around the working components on the circuit board 2 and blows air out towards the transformer coil 4, blowing the heat around it towards the knife holder 6. The upper and lower positioning ribs 5-1-2 of the knife holder 6 are open. The upper and lower cooling air channels 5-1 are set here to allow hot air to pass through. The heat is discharged to the external space through the air outlet window 5-4 at the end of the knife holder and the air outlet windows 5-5 on the upper and lower sides of the knife holder. Furthermore, the left and right positioning ribs 5-2-3 of the tool holder 6 are also open. The left and right heat dissipation channels 5-2 set here allow hot air to be exhausted to the outside through the left and right air outlet windows 5-6 set on the left and right outer walls 5-2-1. At the same time, the left and right inner walls 5-2-2 of the two tool holders are close to each other and are partially hollowed out. The hot air in the left and right heat dissipation channels 5-2 here has a channel to be discharged into the space of the middle heat dissipation channel 5-3. The middle heat dissipation channel 5-3 is equipped with small upper and lower side air outlet windows 5-5, and the internal hot air is discharged to the outside. This process can exhaust the heat from the circuit board 2, transformer coil 4 and tool holder 6 together, achieving the effect of cooling the heat-generating parts and improving the service life of the electrothermal knife.

[0039] like Figure 3-8 As shown, the solution in this embodiment is to design an open positioning structure with heat dissipation ducts at the positioning part of the tool holder 6. This avoids the defect of the existing technology where the positioning of the tool holder 6 is closed, and heat cannot be dissipated. Specifically, the tool holder mounting base 5 leaves space for upper and lower heat dissipation ducts 5-1 to be set above and below the two tool holders, and left and right heat dissipation ducts 5-2 to be set to the left and right of the two tool holders. A middle heat dissipation duct 5-3 is set between the adjacent left and right inner sidewalls 5-2-2 of the two tool holders. The positioning ribs of the tool holder 6 are partially positioned, and the inner sidewalls are partially hollowed out to avoid blocking the heat dissipation ducts, increase the contact area between the tool holder 6 and the air, and dissipate more heat to the outside through the heat dissipation ducts 5-1, 5-2 and 5-3. The upper and lower shells of the tool holder mounting base 5 have the same structural design; the illustration only shows the lower shell for ease of understanding.

[0040] The tool holder mounting base 5 includes upper and lower side walls 5-1-1. In this embodiment, two or more upper and lower positioning ribs 5-1-2 are provided on each side wall. The upper and lower sides of the tool holder 6 are fixed by the corresponding upper and lower positioning ribs 5-1-2 of the upper and lower housing 1. A space is formed between the upper and lower positioning ribs 5-1-2 to clamp the upper and lower sides of the tool holder 6. An upper and lower heat dissipation channel 5-1 is formed between the upper and lower side walls 5-1-1 of the tool holder mounting base 5 and the upper and lower sides of the tool holder 6, which can allow air to pass through. The upper and lower heat dissipation channel 5-1 forms an end air outlet window 5-4 at the end of the tool holder mounting base 5. The tool holder 6 includes an upper tool holder 6-1 and a lower tool holder 6-2. The ends of the upper tool holder 6-1 and the lower tool holder 6-2 and the upper and lower housing 1 of the tool holder mounting base 5 form a total of 4 end air outlet windows 5-4. The purpose is to allow cold air to pass through the upper and lower heat dissipation channel 5-1, carry away the heat on the metal body of the tool holder 6, and directly exhaust it to the outside from the end air outlet window 5-4 of the tool holder.

[0041] The tool holder 6 is provided with a stepped surface, which is engaged on at least one side of the upper and lower positioning ribs 5-1-2 to restrict the forward and backward movement of the tool holder.

[0042] On the main body of the tool holder mounting base 5, while setting the upper and lower heat dissipation air ducts 5-1 at the tool holder 6, the setting of the air outlet windows has also been studied. In order to provide sufficient space for heat dissipation vents at the tool holder mounting base 5, upper and lower side air outlet windows 5-5 are also set on the upper and lower side walls 5-1-1 of the main body of the housing 1, corresponding to the upper and lower heat dissipation air ducts 5-1. The prior art has an air outlet window at the transformer coil 4, which is omitted in this embodiment. The purpose is to avoid the cold air blown out by the cooling fan 3 being discharged to the outside too early during the circulation process, which would affect the heat dissipation airflow at the tool holder 6. Furthermore, the upper and lower side air outlet windows 5-5 are set on the upper and lower sides of the tool holder 6, facing the metal body of the tool holder 6, exposing the metal body. The side air outlet windows of the tool holder mounting base 5 at this location facilitate rapid heat dissipation. The purpose is to increase the heat transfer area between the metal body and the outside air, which is beneficial to the cooling effect.

[0043] like Figure 3-4 Two tool holder mounting bases 5 are arranged side-by-side, corresponding to the upper tool holder 6-1 and the lower tool holder 6-2. Multiple left and right cooling ducts 5-2 are provided on the left and right sides of each tool holder. The left and right side walls of the tool holder mounting base 5 are provided with left and right positioning ribs 5-2-3 for securing the left and right sides of the tool holder 6. Left and right cooling ducts 5-2 are formed between the upper and lower side walls 5-1-1 along the extending direction of the left and right positioning ribs 5-2-3, allowing air to pass through. Left and right side air outlet windows 5-6 are formed on the left and right outer side walls 5-2-1 of the tool holder mounting base 5 near the outer side of the housing, corresponding to the positions of the left and right cooling ducts 5-2. The left and right positioning ribs 5-2-3 are arranged opposite to each other from the upper and lower side walls 5-1-1, with gaps between the opposite left and right positioning ribs 5-2-3 to allow air to pass through.

[0044] like Figure 2 , 4 7. A gap is left between the left and right inner sidewalls 5-2-2 of the two tool holder mounting bases 5 that are close to each other, forming a middle heat dissipation channel 5-3. The left and right inner sidewalls 5-2-2 are partially hollowed out to form a channel, which connects the heat in the left and right heat dissipation channels 5-2 at the left and right inner sidewalls 5-2-2 to the middle heat dissipation channel 5-3. At the same time, the upper and lower sidewalls 5-1-1 of the housing 1 at this location are also provided with upper and lower side air outlet windows 5-5. This design further increases the heat dissipation space, which is conducive to dissipating the heat generated by the circuit board 2, transformer coil 4 and tool holder 6 to the outside of the housing 1.

[0045] To improve the structural strength of the electric hot knife, reinforcing ribs 5-3-1 are provided on the opposing surfaces of the intermediate heat dissipation channel 5-3 formed by the left and right inner sidewalls 5-2-2 of the two knife holder mounting bases 5 that are close to each other. To reduce the air resistance at the outlet of the heat dissipation channel, the sides of the upper and lower positioning ribs 5-1-1, the left and right positioning ribs 5-2-3, and the reinforcing ribs 5-3-1 are chamfered. The left and right inner sidewalls 5-2-2 that are close to each other have partial hollowing at the positions corresponding to the knife holder 6, so that the metal body of the knife holder 6 can contact the air between it and the intermediate heat dissipation channel 5-3, and the temperature of the metal body can be discharged to the outside through the upper and lower side air outlet windows 5-5 at this position.

[0046] This embodiment improves the material composition of the tool holder mounting base 5 because the housing 1 contains a high-temperature tool holder 6. Through experimental screening, high-temperature resistant materials such as PA6T, PA46, and PA9T were selected, with long-term temperature resistance exceeding 200℃, meeting the high-temperature resistance requirements and preventing the risk of melting at high temperatures. The aforementioned heat dissipation duct structure design already meets the heat dissipation and cooling requirements; the material improvement is merely a supplementary solution.

[0047] The tool holder mounting base 5 in this embodiment features an improved heat dissipation duct design. Actual testing data demonstrates that, compared to existing technologies operating at near-rated power with a 120W electric hot knife, the temperature of the transistor on circuit board 2 increased by 3°C to 39.7°C, within a reasonable temperature range; the temperature of the transformer coil 4 decreased by 10°C to 54.3°C; the temperature of the internal plastic component near the tool holder 6 decreased by 33°C to 61°C; and the temperature of the metal body of the tool holder 6 decreased by 50°C to 89°C. Experimental data verifies that this technical solution effectively controls the temperature of circuit board 2 within an acceptable range, further reduces the temperature of transformer coil 4, and significantly reduces the high temperature of the tool holder 6, eliminating the risk of casing melting at this location.

[0048] 120W Electric Hot Knife Air Duct Improvement Test Record

[0049] (230V, 50HZ, 0.49A, 112W)

[0050]

[0051] The above embodiments are merely illustrative of the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of this invention.

Claims

1. An electric heating knife with a heat dissipation air duct structure for the blade holder, characterized in that: Includes a housing, with a handle formed at the rear of the housing and a tool holder mounting base at the front of the housing for fixed connection with the tool holder; The tool holder mounting base includes upper and lower side walls; upper and lower positioning ribs are provided on the upper and lower side walls, and through the cooperation of the upper and lower positioning ribs on the housing, a space is formed between the upper and lower positioning ribs to clamp the upper and lower sides of the tool holder. An air duct structure is set at the tool holder, and the upper and lower positioning ribs are positioned by partial contact. The upper and lower side walls of the tool holder mounting base and the upper and lower side surfaces of the tool holder form an upper and lower heat dissipation air duct that can pass through the air. The upper and lower heat dissipation air duct forms an end air outlet window at the end of the tool holder mounting base. Upper and lower side air outlets are provided on the upper and lower side walls of the casing, corresponding to the positions of the upper and lower heat dissipation air ducts. The left and right side walls of the tool holder mounting base are provided with left and right positioning ribs for clamping the left and right sides of the tool holder; the left and right positioning ribs adopt partial contact positioning, and the left and right positioning ribs leave a gap with at least one upper and lower side wall of the tool holder mounting base, or the left and right positioning ribs are partially hollowed out, so that the left and right heat dissipation channels that can pass through the air are formed between the upper and lower side walls along the extension direction of the left and right positioning ribs. The left and right side air outlet windows are formed on the left and right outer side walls of the tool holder mounting base near the outer side of the housing, corresponding to the positions of the left and right heat dissipation channels. At least two tool holder mounting bases are arranged side by side, with a gap between the adjacent left and right inner sidewalls of the tool holder mounting bases to form a central heat dissipation air duct. Corresponding to the position of the central heat dissipation air duct, upper and lower side air outlet windows are provided on the upper and lower sidewalls of the housing.

2. The electric heating knife with a heat dissipation duct structure for the blade holder according to claim 1, characterized in that: The upper and lower positioning ribs include at least two, and the tool holder has a stepped surface. The stepped surface is engaged with at least one side of the upper and lower positioning ribs to restrict the movement of the tool holder in the front-back direction.

3. The electric heating knife with a heat dissipation duct structure for the blade holder according to claim 1, characterized in that: When the left and right positioning ribs are simultaneously installed opposite each other from the upper and lower side walls, a gap is left between the opposite left and right positioning ribs to allow air to pass through.

4. The electric heating knife with a heat dissipation duct structure for the blade holder according to claim 1, characterized in that: The inner sidewalls of the left and right sides of the tool holder mounting base, which are close to each other, are partially hollowed out.

5. The electric heating knife with a heat dissipation duct structure for the blade holder according to claim 1, characterized in that: The opposing surfaces of the left and right inner sidewalls of the tool holder mounting base are provided with reinforcing ribs; the sides of the upper and lower positioning ribs and / or reinforcing ribs are chamfered or rounded.

6. The electric heating knife with a heat dissipation duct structure for the blade holder according to claim 1, characterized in that: An air intake window is provided at the rear of the casing, and a cooling fan is installed inside the casing; the casing also contains a transformer coil and a circuit board; the cooling fan is located between the transformer coil and the circuit board.

7. The electric heating knife with a heat dissipation duct structure for the blade holder according to claim 1, characterized in that: The housing of the tool holder positioning seat is made of one of PA6T, PA46, or PA9T.

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