JPH0335483Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a heating head of a blower for attaching and detaching electronic components, which is used when attaching and detaching electronic components such as ICs to and from a board.

[Conventional technology and its issues]

The heating head of the conventional blower for installing and removing electronic components is
As shown in Fig. 3, the cylindrical head body a has
A rod-shaped heating element b such as a ceramic heater is provided, and air supplied from the upper part of the head body a is heated while traveling along the outer periphery of the rod-shaped heating element b, and becomes hot air.

However, with the above configuration, the air passing near the outer peripheral surface of the rod-shaped heating element b undergoes sufficient heat exchange and its temperature rises, but the air outside passes through without undergoing heat exchange. As a result, the outlet temperature is averaged and lowered.

Therefore, in order to ensure the necessary blowing temperature, it is necessary to take measures such as increasing the heat generating capacity of the heater or increasing the size of the heating element.

Therefore, the challenge of this invention is to heat a blower for attaching and detaching electronic components that can maintain a high blowing temperature even when using a heating element with the same heat generation capacity as conventional ones by performing heat exchange more efficiently. The aim is to provide a head.

[Means to solve the problem]

In order to solve the above problems, the heating head of this invention is provided with an inner cylinder that forms an inner flow path around the outer periphery of a cylindrical heating element whose upper end is closed, and an outer cylinder that forms an outer flow path around the outer periphery of the inner cylinder. , the upper and lower ends of each of the flow channels are closed, an air supply port is provided in the upper part of the outer cylinder, and a plurality of air inlets are provided around the inner cylinder to guide air from the outer flow path to the inner flow path. The structure is such that an inlet for air from the inner flow path is formed in the upper part of the cylindrical heating element.

[Effect]

The air supplied to the heating head is preheated from the inner cylinder by passing through the outer flow path, and when it enters the inner flow path from the outer flow path, it is distributed over a wide area of the outer circumferential surface of the heating element through multiple distributed air inlets. Heat is exchanged efficiently because it is sprayed over the area.

Furthermore, since the air comes into contact with not only the outer circumferential surface of the cylindrical heating element but also the inner circumferential surface, the heat exchange area increases.

〔Example〕

Examples will be described below with reference to the drawings.

As shown in FIG. 1, the heating head of this blower for attaching and removing electronic components consists of a head body 10 and a ceramic heater 20 loaded therein, and as shown in FIG.
Attach and use.

The head main body 10 is a cylindrical body with a double wall structure having an inner cylinder 11a and an outer cylinder 11b, and the upper end wall 12 has a hole 14 for loading the ceramic heater 20, while the lower end wall 13 has a hole 14 for loading the ceramic heater 20. An outlet 15 is provided.

In addition, an air supply port 16 is provided at the top of the outer cylinder 11b.
An air pump (not shown) is connected to the outer flow path 18 via a silicone hose 41.
Air is pumped into b. Further, a large number of small-diameter air inlet ports 17 are provided at the lower part of the inner cylinder 11a all around the circumference, and the air in the outer flow path 18b is transferred to the inner flow path 17 formed by loading the ceramic heater 20.
lead to a.

The ceramic heater 20 is a cylindrical body with its upper end closed, and air in the inner flow path 18a is guided to the inside of the ceramic heater 20 through two inlets 21 provided at the upper part.

In the heating head constructed as described above, the air sent from the supply port 16 descends through the outer flow path 18b while receiving preheating from the inner cylinder 11a, and is blown into the inner flow path 18a from the air inlet 17. At this time, since the air collides with the outer circumferential surface of the ceramic heater 20, the heat exchange efficiency is high and the heating is done evenly. Then, this air ascends through the inner flow path 18a while receiving heat supply from the ceramic heater 20,
It enters the inside of the ceramic heater 20 through the inlet 21. The air that has entered the ceramic heater 20 is further heated as it descends, and is blown out from the air outlet 15 as hot air.

The blown hot air is distributed and supplied to the leads of the electronic components from a blowing nozzle 30 attached to the tip of the heating head.

〔effect〕

This idea was developed by making the heating element of the heating head cylindrical, forming air flow paths along its outer and inner circumferential surfaces, and blowing the supplied air over a wide range of the outer circumferential surface of the heating element. , the heat exchange efficiency is improved, and the blowing temperature can be increased even if the heating elements have the same heat generation capacity.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view showing the main part of an embodiment of this invention, FIG. 2 is a perspective view showing the whole of the same,
FIG. 3 is a sectional view showing the main parts of a conventional example. 10...Head body, 11a...Inner cylinder, 11b
... Outer cylinder, 12 ... Upper end wall, 13 ... Lower end wall, 1
4... Hole, 15... Air outlet, 16... Supply port, 1
7...Inlet, 18a...Inner channel, 18b...
Outer channel, 20... Ceramic heater, 21...
Inlet.

Claims (1)

[Scope of utility model registration request] An inner cylinder that forms an inner flow path is provided on the outer periphery of the cylindrical heating element whose upper end is closed, an outer cylinder that forms an outer flow path is provided on the outer periphery of the inner cylinder, and the upper and lower ends of each of the flow paths are closed. , an air supply port is provided at the top of the outer cylinder,
A blower for attaching and removing electronic components, in which a plurality of inlets are formed around the inner cylinder to guide air from the outer flow path to the inner flow path, and an inlet for air from the inner flow path is formed above the cylindrical heating element. heating head.