Hot air gun

Abstract

The utility model relates to the technical field of electronic product tin removing tools, in particular to a heat gun which comprises an air nozzle, an air pipe and a heating assembly. The air outlet end of the air pipe is detachably connected to the air inlet end of the air nozzle, the air inlet end of the air nozzle is provided with a tubular part extending into a pipe cavity of the air pipe, a pipe cavity of the tubular part is communicated with an air channel of the air nozzle, and the outer side wall of the tubular part, the inner side wall of the air pipe and the air nozzle define a heat insulation cavity with an opening facing the air inlet end of the air pipe. The heat insulation cavity plays a heat insulation role, the heating assembly is arranged in a pipe cavity of the tubular part, when ventilation is conducted to the air inlet end of the air pipe, cold air introduced into the air pipe enters the tubular part and flows into the heat insulation cavity at the same time, the cold air entering the tubular part is divided into two parts, one part is heated by the heating assembly to form hot air, and the hot air flows out of the air nozzle; cold air flows into the heat insulation cavity so that the temperature of the heat insulation cavity can be reduced, and the situation that the temperature of the air pipe is too high is further avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic product tin removal tools, in particular to a hot air gun. Background Art

[0002] During the repair process of electronic products, a hot air gun is needed to heat the soldering points, melt the soldering points and then remove the electronic components. In order to avoid scalding hands by the air duct, existing hot air guns often set a vacuum insulation structure in the wall of the air duct. The vacuum insulation structure has a complex structure and high processing cost, resulting in a high processing cost for the hot air gun. Utility Model Content

[0003] The technical problem to be solved by the utility model is that: currently, the air duct of the hot air gun adopts a vacuum heat insulation structure, which leads to a high processing cost of the hot air gun.

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a hot air gun, comprising a nozzle, an air duct and a heating component; the air outlet end of the air duct is connected to the air inlet end of the nozzle, the air inlet end of the nozzle is provided with a tubular portion extending into the tube cavity of the air duct, the tube cavity of the tubular portion is connected to the air duct of the nozzle, the outer wall of the tubular portion, the inner wall of the air duct and the air nozzle enclose a heat-insulating cavity opening toward the air inlet end of the air duct; the heating component is arranged in the tube cavity of the tubular portion.

[0005] As a preferred solution, the air inlet end of the air nozzle and the air outlet end of the air duct are interference fitted.

[0006] As a preferred embodiment, the heating component includes a heating element and a supporting element, one end of the supporting element is fixed in the air duct, the other end of the supporting element extends into the tubular portion, the heating element is connected to the supporting element located in the tubular portion, and the heating element is spaced apart from the tube wall of the tubular portion.

[0007] As a preferred solution, a temperature sensor is provided in the air duct of the air nozzle.

[0008] As a preferred solution, the support member includes a conductive wire and a heat-insulating tube fixedly sleeved on the outside of the conductive wire, the heating element is connected to the outside of the heat-insulating tube, and the conductive wire is fixed in the air duct.

[0009] As a preferred solution, one end of the conductive wire toward the air nozzle extends into the air duct of the air nozzle and is fixedly connected to the temperature sensor.

[0010] As a preferred embodiment, the heating element is a coil spring-shaped heating wire, the thermal insulation tube is inserted into the heating element, the outer wall of the thermal insulation tube is spaced apart from the inner wall of the heating element, and connecting arms are provided at both ends of the heating element, and each connecting arm is respectively connected to the two ends of the thermal insulation tube.

[0011] As a preferred solution, the thermal insulation tube is a ceramic tube.

[0012] As a preferred solution, the air inlet end of the air duct is connected with an adapter, a ventilation cavity connected to the tube cavity of the air duct is provided in the adapter, one end of the conductive wire away from the air nozzle is fixedly connected to the adapter, and the conductive wire and the heating element are both electrically connected to the adapter;

[0013] The hot air gun also includes a joint seat, which is provided with a mounting hole, the adapter is detachably inserted into the mounting hole, and the ventilation cavity is connected to the mounting hole, and the joint seat is provided with an air supply device connected to the mounting hole.

[0014] As a preferred solution, one end of the adapter away from the air duct is connected to a hood, and the hood is provided with a ventilation hole connected to the ventilation cavity.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model of the hot air gun comprises a nozzle, an air duct and a heating component; the air outlet end of the air duct is connected to the air inlet end of the nozzle, the air inlet end of the nozzle is provided with a tubular portion extending into the tube cavity of the air duct, the tube cavity of the tubular portion is connected with the air duct of the nozzle, the outer wall of the tubular portion, the inner wall of the air duct and the nozzle form an insulating cavity with an opening facing the air inlet end of the air duct; the insulating cavity plays a role of heat insulation, and the heating component is arranged in the tube cavity of the tubular portion, when the air inlet end of the air duct is ventilated, the cold air entering the air duct enters the tubular portion and flows into the insulating cavity at the same time, the cold air entering the tubular portion is divided into two parts, one part is heated by the heating component to form hot air, and the hot air flows out from the nozzle; the other part flows into the insulating cavity from the opening of the insulating cavity, and the cold air flowing into the insulating cavity can reduce the temperature of the insulating cavity, further avoiding the excessive temperature of the air duct. The utility model of the hot air gun does not need to set a vacuum insulation structure in the air duct, the air duct structure is simple, and the processing cost of the hot air gun is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a side view of the hot air gun of the utility model when the joint seat is not installed;

[0018] Figure 2 for Figure 1 Middle AA section view;

[0019] Figure 3It is an exploded view of the hot air gun of the utility model when the joint seat is not installed;

[0020] Figure 4 A side view of the hot air gun of the utility model when installing the connector seat;

[0021] In the figure, 1. air nozzle, 11. tubular part, 12. thermal insulation chamber, 2. air duct, 3. heating component, 31. heating element, 32. supporting member, 321. conductive wire, 322. thermal insulation tube, 4. temperature sensor, 5. adapter, 6. connector seat, 7. hood. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. It should be understood that the terms "first", "second", etc. are used in the present utility model to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present utility model, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0024] like Figures 1 to 4As shown, the hot air gun of the utility model comprises an air nozzle 1, an air duct 2 and a heating component 3; the air outlet end of the air duct 2 is connected to the air inlet end of the air nozzle 1, the air inlet end of the air nozzle 1 is provided with a tubular portion 11 extending into the tube cavity of the air duct 2, the tube cavity of the tubular portion 11 is connected to the air duct of the air nozzle 1, the outer wall of the tubular portion 11, the inner wall of the air duct 2 and the air nozzle 1 enclose a heat-insulating cavity 12 with an opening facing the air inlet end of the air duct 2; the heating component 3 is arranged in the tube cavity of the tubular portion 11. The heat-insulating cavity 12 plays a role of heat insulation, and the heating component 3 is arranged in the cavity of the tubular portion 11. When the air inlet end of the air duct 2 is ventilated, the cold air entering the air duct 2 enters the tubular portion 11 and flows into the heat-insulating cavity 12. The cold air entering the tubular portion 11 is divided into two parts. One part is heated by the heating component 3 to form hot air, and the hot air flows out from the air nozzle 1; the other part flows into the heat-insulating cavity 12 from the opening of the heat-insulating cavity 12. The cold air flowing into the heat-insulating cavity 12 can reduce the temperature of the heat-insulating cavity 12, further avoiding the over-high temperature of the air duct 2. The hot air gun of the utility model does not need to set a vacuum insulation structure in the air duct 2. The air duct 2 has a simple structure, which reduces the processing cost of the hot air gun.

[0025] Specifically, the tubular portion 11 is integrally arranged on the inner side of the air inlet end of the air nozzle 1, the inner diameter of the air duct 2 is larger than the outer diameter of the tubular portion 11, the length of the tubular portion 11 is smaller than the length of the air duct 2, and there are various ways to connect the air nozzle 1 and the air duct 2. In this embodiment, the air inlet end of the air nozzle 1 and the air outlet end of the air duct 2 are interference fitted, that is, the air outlet end of the air duct 2 is interference sleeved on the outer side of the air nozzle 1. In other embodiments of the utility model, an external thread can be provided at the air inlet end of the air nozzle 1, and an internal thread can be provided at the air outlet end of the air duct 2, and the internal thread is screwed with the external thread; the end of the air duct 2 can also be bonded to the end of the air nozzle 1.

[0026] In this embodiment, the heating assembly 3 includes a heating element 31 and a support element 32, one end of the support element 32 is fixed in the air duct 2, the other end of the support element 32 extends into the tubular portion 11, the heating element 31 is connected to the support element 32 located in the tubular portion 11, and the heating element 31 is arranged at intervals from the tube wall of the tubular portion 11. Specifically, the heating element 31 is suspended between the support element 32 and the tubular portion 11, thereby increasing the contact area between the air flowing into the tubular portion 11 and the heating element, and ensuring the heating efficiency.

[0027] In order to facilitate the control of the air outlet temperature of the air nozzle 1 , in this embodiment, a temperature sensor 4 is provided in the air duct of the air nozzle 1 .

[0028] In order to ensure the compact structure of the hot air gun of this embodiment, in this embodiment, the support member 32 includes a conductive wire 321 and a heat-insulating tube 322 fixedly sleeved on the outside of the conductive wire 321, the heating element 31 is connected to the outside of the heat-insulating tube 322, the conductive wire 321 is fixed in the air duct 2, the conductive wire 321 extends into the air duct of the air duct 1 toward one end of the air nozzle 1, and the temperature sensor 4 is fixed at the end of the conductive wire 321 located in the air duct of the air nozzle 1, and the conductive wire 321 is electrically connected to the temperature sensor 4. The conductive wire 321 not only plays the role of energizing the temperature sensor 4, but also plays the role of connecting the heat-insulating sleeve and the temperature sensor 4; the hot air gun of this embodiment does not need to set an additional support structure in the air duct 2 to support the heat-insulating tube 322, nor does it need to set a connection structure in the air nozzle 1 for connecting the temperature sensor 4, thereby ensuring the compact structure of the hot air gun. Among them, the conductive wire 321 can be directly made of thicker copper wire or aluminum wire.

[0029] Furthermore, in order to ensure the heating efficiency of the heating element 31 to the air, in this embodiment, the heating element 31 is a coil spring-shaped heating wire, the heat-insulating tube 322 is inserted into the heating element 31, the outer wall of the heat-insulating tube 322 is arranged at intervals from the inner wall of the heating element 31, and connecting arms are provided at both ends of the heating element 31, and each connecting arm is respectively connected to the two ends of the heat-insulating tube 322. Specifically, the main structure of the heating element 31 is similar to that of a coil tension spring, and the two ends of the heating element 31 are connected to the two ends of the heat-insulating tube 322 through connecting arms, so that the main part of the heating element 31 is suspended and arranged between the tubular portion 11 and the conductive wire 321.

[0030] In this embodiment, the heat-insulating tube 322 is a ceramic tube. In other embodiments of the present invention, the heat-insulating tube 322 may be a polymer tube.

[0031] During the use of the hot air gun, the operator needs to select a hot air gun with a suitable size of the nozzle 1 according to the actual operation conditions. In this embodiment, the air inlet end of the air duct 2 is connected with an adapter 5, and the end of the conductive wire 321 away from the nozzle 1 is fixed to the adapter 5. In this embodiment, the conductive wire 321 is relatively thick, and the conductive wire 321 plays the role of connecting the temperature sensor 4 and the heat-insulating sleeve. The conductive wire 321 and the heating element 31 are both electrically connected to the adapter 5;

[0032] The hot air gun also includes a joint seat 6, which is provided with a mounting hole, and the adapter 5 is detachably inserted in the mounting hole, and the ventilation cavity is connected to the mounting hole, and the joint seat 6 is provided with an air supply device connected to the mounting hole. Specifically, in this embodiment, the air nozzle 1, the air duct 2, the heating element 31 and the adapter 5 form an air nozzle 1 assembly, and different air nozzle 1 assemblies have air nozzles 1 of different sizes and heating elements of different powers; the joint seat 6 is a universal component, and when in use, the hot air gun can be adapted to different working conditions by replacing the air nozzle 1 assembly. In this embodiment, the setting method of the joint seat 6 and the adapter 5 is similar to the connection method of the light bulb and the lamp holder, except that the adapter 5 is provided with a ventilation hole, and the joint seat 6 is provided with a mounting hole, and the mounting hole can also be used for cold air to pass through.

[0033] Among them, the end of the adapter 5 away from the air duct 2 is connected to the hood 7, and the hood 7 is provided with a ventilation hole connected to the ventilation cavity. The cold air generated by the air supply device enters the ventilation cavity through the ventilation hole and then flows into the air duct 2 and the tubular part 11.

[0034] In summary, the hot air gun of the utility model comprises a nozzle 1, an air duct 2 and a heating component 3; the air outlet end of the air duct 2 is connected to the air inlet end of the nozzle 1, the air inlet end of the nozzle 1 is provided with a tubular portion 11 extending into the tube cavity of the air duct 2, the tube cavity of the tubular portion 11 is connected to the air duct of the nozzle 1, the outer wall of the tubular portion 11, the inner wall of the air duct 2 and the nozzle 1 enclose a heat-insulating cavity 12 with an opening toward the air inlet end of the air duct 2; the heat-insulating cavity 12 plays a role of heat insulation, and the heating component 3 is provided with a heat-insulating cavity 12, and the heating component 3 is provided with a heat-insulating cavity 12. Component 3 is arranged in the tube cavity of tubular portion 11. When ventilation is conducted to the air inlet end of air duct 2, the cold air entering into air duct 2 enters tubular portion 11 and flows into heat insulation cavity 12. The cold air entering tubular portion 11 is divided into two parts. One part is heated by heating component 3 to form hot air, and the hot air flows out from air nozzle 1. The other part flows into heat insulation cavity 12 from the opening of heat insulation cavity 12. The cold air flowing into heat insulation cavity 12 can reduce the temperature of heat insulation cavity 12, and further avoid the temperature of air duct 2 being too high. The hot air gun of the utility model does not need to set vacuum insulation structure in air duct 2. The air duct 2 has a simple structure, and the processing cost of the hot air gun is reduced.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A hot air gun, characterized in that: The invention comprises an air nozzle (1), an air duct (2) and a heating component (3); the air outlet end of the air duct (2) is connected to the air inlet end of the air nozzle (1); the air inlet end of the air nozzle (1) is provided with a tubular portion (11) extending into the tube cavity of the air duct (2); the tube cavity of the tubular portion (11) is connected to the air duct of the air nozzle (1); the outer wall of the tubular portion (11), the inner wall of the air duct (2) and the air nozzle (1) enclose a heat-insulating cavity (12) whose opening faces the air inlet end of the air duct (2); and the heating component (3) is arranged in the tube cavity of the tubular portion (11).

2. The hot air gun according to claim 1, characterized in that: The air inlet end of the air nozzle (1) and the air outlet end of the air duct (2) are interference fitted.

3. The hot air gun according to claim 1, characterized in that: The heating component (3) comprises a heating element (31) and a supporting element (32); one end of the supporting element (32) is fixed in the air duct (2); the other end of the supporting element (32) extends into the tubular portion (11); the heating element (31) is connected to the supporting element (32) located in the tubular portion (11); and the heating element (31) is spaced apart from the tube wall of the tubular portion (11).

4. The hot air gun according to claim 3, characterized in that: A temperature sensor (4) is provided in the air duct of the air nozzle (1).

5. The hot air gun according to claim 4, characterized in that: The support member (32) comprises a conductive wire (321) and a heat-insulating tube (322) fixedly sleeved on the outside of the conductive wire (321); the heating element (31) is connected to the outside of the heat-insulating tube (322); and the conductive wire (321) is fixed in the air duct (2).

6. The hot air gun according to claim 5, characterized in that: One end of the conductive wire (321) facing the air nozzle (1) extends into the air duct of the air nozzle (1) and is fixedly connected to the temperature sensor (4).

7. The hot air gun according to claim 5, characterized in that: The heating element (31) is a coil spring-shaped heating wire, the heat-insulating tube (322) is inserted into the heating element (31), the outer wall of the heat-insulating tube (322) is spaced apart from the inner wall of the heating element (31), and connecting arms are provided at both ends of the heating element (31), and each connecting arm is respectively connected to the two ends of the heat-insulating tube (322).

8. The hot air gun according to claim 5, characterized in that: The heat-insulating tube (322) is a ceramic tube.

9. The hot air gun according to claim 5, characterized in that: The air inlet end of the air duct (2) is connected to an adapter (5), a ventilation cavity connected to the tube cavity of the air duct (2) is provided in the adapter (5), one end of the conductive wire (321) away from the air nozzle (1) is fixedly connected to the adapter (5), and the conductive wire (321) and the heating element (31) are both electrically connected to the adapter (5); The hot air gun further comprises a joint seat (6), wherein the joint seat (6) is provided with a mounting hole, wherein the adapter (5) is detachably inserted into the mounting hole, and wherein the ventilation cavity is connected to the mounting hole, and wherein the joint seat (6) is provided with an air supply device connected to the mounting hole.

10. The hot air gun according to claim 9, characterized in that: One end of the adapter (5) away from the air duct (2) is connected to a hood (7), and the hood (7) is provided with a ventilation hole communicating with the ventilation cavity.

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