CN2735267Y - Improved air heater - Google Patents

Abstract

The utility model discloses an improved air heater, which relates to an electromechanical product and comprises a motor 1, a main shaft 2, a heat insulation shell 3, a casing 5, an impeller 7 and an auxiliary impeller 4, wherein the main shaft 2 of the motor 1 passes through the heat insulation shell 3 to enter the casing 5, the end part of the main shaft is provided with the impeller 7, and the auxiliary impeller 4 is arranged between the inner wall at the left side of the casing 5 and the left side of the impeller 7; the main shaft temperature control device has the characteristics of simple structure, capability of greatly reducing the temperature of the main shaft and the like, can be widely suitable for various types of drying systems, can be used for producing the air heater, can also be used for transforming the existing air heater, and is an ideal air heater.

Description

An improved hot air blower

technical field

The utility model relates to an electromechanical product, in particular to an improved hot air blower.

Background technique

At present, the hot air blower used in various drying systems generally adopts a centrifugal fan. The main shaft part between the motor and the casing of this kind of fan is covered with a heat-insulating casing, and the high-temperature hot air enters from the other side of the casing. After passing through the impeller, it bulges out from the side. In practice, this kind of fan often has the phenomenon that the temperature of the main shaft is too high and it is easy to damage the bearing at the end of the motor. The main reason is that the hot air entering the casing transfers heat to the main shaft from two channels, and the other is directly conducted by the main shaft and the impeller. The other way is that when the impeller blows out hot air, a small amount of hot air will escape to the end of the motor through the gap between the main shaft and the heat shield, and bring heat to the main shaft and the end of the motor, making the bearing at the end of the motor The temperature often reaches above 130°C, causing the bearing to be damaged. In order to increase the service life of the bearing, some manufacturers have adopted many methods to reduce the temperature of the main shaft. These methods are all around improving the heat dissipation conditions of the heat insulation shell, such as installing circulating water cooling devices in the heat insulation shell, etc.; these The use of the method not only increases the complexity of the structure of the heat blower, improves its production cost, but also reduces the convenience of the use of the heat blower, and simultaneously, its use effect is often difficult to be satisfactory.

Utility model content

In view of the above-mentioned shortcomings of the hot air blower, the technical problem to be solved by the utility model is to provide a hot air blower with a simple structure that can greatly reduce the temperature of the main shaft.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: it is composed of a motor 1, a main shaft 2, a heat-insulating shell 3, a casing 5, an impeller 7 and an auxiliary impeller 4, and the main shaft 2 of the motor 1 passes through the heat-insulating shell 3 enters the casing 5, and the impeller 7 is installed at its end; the auxiliary impeller 4 is installed between the left inner wall of the casing 5 and the left side of the impeller 7.

The auxiliary impeller 4 is a blade fixed on the left side of the impeller 7 .

In the improved hot air blower of the present utility model, the auxiliary impeller 4 is installed between the left inner wall of the casing 5 and the left side of the impeller 7, so that when the motor 1 drives the main shaft 2 and the impeller 7 and the auxiliary impeller 4 to rotate , the impeller 7 blows out the hot air, and the auxiliary impeller 4 draws the cold air at the end of the motor 1 into the casing through the gap between the heat insulation shell 3 and the main shaft 2, and is blown out together with the hot air. When the cold air passes through the gap between the end of the motor 1 and the heat shield 3 and the main shaft 2, it will take away most of the heat on the end of the motor 1 and the main shaft 2, thereby reducing the heat between the end of the motor 1 and the main shaft 2. temperature. Through testing, the hot air blower of the present utility model, when inhaling and blowing out the hot blast of 350～400 ℃, the temperature of its motor 1 end and main shaft 2 can be kept on about 40 ℃. Because the hot air blower of the present utility model just installs an auxiliary impeller 4 additionally, so its structure is simpler.

Description of drawings

Accompanying drawing 1 is the sectional view along A---A axis of the present utility model;

Accompanying drawing 2 is the sectional view along B---B axis of the present utility model.

Detailed ways

Below in conjunction with accompanying drawing, describe the embodiment of the utility model in detail.

The present embodiment comprises motor 1, main shaft 2, heat insulation case 3, casing 5, impeller 7 and auxiliary impeller 4, and auxiliary impeller 4 is contained in the left side of impeller 7 back-to-back (also can be fixed on the left side of impeller 7 The blade replaces the auxiliary impeller 4); the main shaft 2 of the motor 1 passes through the heat insulation shell 3 and enters the casing 5, and the auxiliary impeller 4 and the impeller 7 are installed at its end.

When in use, turn on the power, the motor 1 drives the main shaft 2, the impeller 7 and the auxiliary impeller 4 to rotate, the hot air enters from the hot air inlet 8 on the right side of the casing, blows to the hot air outlet 6 through the impeller 7, and is sent to the drying system. At the same time, the auxiliary impeller 4 draws the cold air at the end of the motor 1 into the casing through the gap between the heat insulation shell 3 and the main shaft 2, and is blown out together with the hot air; During the process, the heat from the end of the motor 1 and the main shaft 2 is naturally taken away, thereby reducing the temperature of the end of the motor 1 and the main shaft 2 .

This improvement of the utility model can not only be applied to the production of hot air blowers, but also can be easily applied to the transformation of existing hot air blowers. During the transformation, it is mainly to use the gap between the left inner wall of the casing of the existing hot air blower and the left side of the impeller, and install the auxiliary impeller in between, and fix it on the main shaft or together with the impeller to form a joint with the impeller. A small fan that blows air in the same direction. If the blade of the auxiliary impeller is directly fixed on the left side of the impeller, the principle is the same as above, and the effect is better.

Claims (2)

1, a kind of modified model air heater comprises motor (1), main shaft (2), heat-insulating housing (3), casing (5) and impeller (7), and the main shaft (2) of motor (1) passes heat-insulating housing (3) and enters in the casing (5), and impeller (7) is installed in its end; It is characterized in that: between the left side of the left side inwall of casing (5) and impeller (7), a sub-propeller (4) is housed also.

2, modified model air heater according to claim 1 is characterized in that: sub-propeller 4 is the blades that are fixed on impeller 7 left surfaces.

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