Side-inlet straight-through type premixing fan

Abstract

This utility model discloses a side-inlet direct-flow premixed fan, including a front cover plate, a volute front cover, and a volute rear cover. The front cover plate is installed at the front end of the volute front cover, and the volute rear cover is installed at the rear end of the volute front cover. The front cover plate has multiple evenly distributed air inlets for oxygen and fuel gas to enter. A first premixing chamber is formed between the front cover plate and the volute front cover, and a second premixing chamber is formed between the volute front cover and the volute rear cover. The volute front cover has an air inlet for gas to enter the second premixing chamber from the first premixing chamber, and the volute rear cover has a mixed exhaust port. A motor is installed on the front side of the front cover plate, a motor-driven impeller is installed in the second premixing chamber, and a guide vane is installed in the volute rear cover. The long path for oxygen and fuel gas allows for thorough mixing, resulting in high combustion efficiency. The enclosed motor structure is dustproof and waterproof, extending its service life.

Description

Technical Field

[0001] This utility model belongs to the field of wall-hung boiler fan technology, specifically a side-inlet direct-flow premixed fan. Background Technology

[0002] The invention patent with patent number 201921772575.X discloses a pre-mixed fan, including a fan body that is connected to each other; the fan body is provided with a power chamber and a pre-mixed chamber; the power chamber is provided with a motor; the pre-mixed chamber is provided with motor-driven fan blades; the pre-mixed chamber is provided with a gas inlet and an air inlet; the pre-mixed chamber is provided with a mixed gas outlet.

[0003] The patent disclosure has certain flaws. Gas and air enter the intake chamber separately, then pass through the pre-premixing chamber, and finally exit through the mixed gas outlet. Because the mixed gas outlet is located on one side of the pre-premixing chamber, the gas in this type of fan may leak outwards through the shaft hole. Furthermore, this type of fan has a large radial dimension, occupying more space, and its short mixing path easily leads to uneven mixing of oxygen and gas, incomplete combustion, and resource waste. Summary of the Invention

[0004] This utility model addresses the aforementioned technical problems by providing a side-inlet direct-flow premixed fan, which improves the fan structure, prevents gas leakage, saves space costs, increases the path for oxygen and gas to pass through, allowing them to mix fully and improving combustion efficiency.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a side-inlet direct-flow premixed fan, including a front cover plate, a volute front cover, and a volute rear cover. The front cover plate is installed at the front end of the volute front cover, and the volute rear cover is installed at the rear end of the volute front cover. The front cover plate has a plurality of air inlet holes evenly distributed for oxygen and fuel gas to enter. A first premixing chamber is formed between the front cover plate and the volute front cover, and a second premixing chamber is formed between the volute front cover and the volute rear cover. The volute front cover has an air inlet for gas to enter the second premixing chamber from the first premixing chamber, and the volute rear cover has a mixed exhaust port. A motor is provided on the front side of the front cover plate, a motor-driven impeller is provided in the second premixing chamber, and a guide vane is installed in the volute rear cover.

[0006] To optimize the above technical solution, the present invention also includes the following improved technical solutions.

[0007] A first groove is formed at the contact point between the front end cover of the volute and the air passage plate, and an O-ring is provided in the first groove.

[0008] The aforementioned moving impeller is rotatably mounted on the motor shaft of the motor, and a screw is provided at one end of the motor shaft.

[0009] The aforementioned volute front end cover has a first arc-shaped surface that conforms to the curvature of the impeller blades; a second groove is formed at one end of the first arc-shaped surface extending to the air inlet.

[0010] The aforementioned air guide wheel is embedded in the rear end cover of the volute in a specified direction, and the air guide wheel is fixed to the rear end cover of the volute by screws.

[0011] The rear end of the aforementioned volute front cover is provided with a first mounting portion, and the front end of the aforementioned volute rear cover is provided with a second mounting portion that cooperates with the first mounting portion for installation.

[0012] Compared with existing technologies, this utility model provides a side-inlet direct-flow premixed fan. Oxygen and fuel gas enter the first premixing chamber through the air inlet hole of the front cover plate, then enter the second premixing chamber through the air inlet, and finally pass through the moving impeller and guide vane before being discharged as a mixed gas through the mixing exhaust port. The fan has a small radial dimension, saving space and cost, and its neat appearance facilitates assembly. Oxygen and fuel gas can only pass through the above-mentioned path, reducing the risk of gas leakage. The long path traveled by oxygen and fuel gas allows for thorough mixing, resulting in high combustion efficiency. The motor structure is enclosed, dustproof, and waterproof, extending its service life. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of this embodiment.

[0014] Figure 2 This is a schematic diagram of the exploded structure of this embodiment. Detailed Implementation

[0015] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0016] Figures 1 to 2 The diagram shown is a structural schematic of this utility model.

[0017] The attached figures are labeled as follows: front end cover 1, air inlet 1a, front end cover of volute 2, air inlet 2a, first groove 2b, first arc-shaped surface 2c, second groove 2d, first mounting part 2e, rear end cover of volute 3, mixed exhaust port 3a, second mounting part 3b, first premixing chamber 4, second premixing chamber 5, motor 6, motor shaft 6a, moving impeller 7, and guide vane 8.

[0018] This utility model discloses a side-inlet direct-flow premixed fan, comprising a front cover plate 1, a volute front cover 2, and a volute rear cover 3. The front cover plate 1 is installed at the front end of the volute front cover 2, and the volute rear cover 3 is installed at the rear end of the volute front cover 2. The front cover plate 1 has multiple evenly distributed air inlets 1a for oxygen and fuel gas to enter. A first premixing chamber 4 is formed between the front cover plate 1 and the volute front cover 2, and a second premixing chamber 5 is formed between the volute front cover 2 and the volute rear cover 3. The volute front cover 2 has an air inlet 2a for gas to enter the second premixing chamber 5 from the first premixing chamber 4, and the volute rear cover 3 has a mixed exhaust port 3a. A motor 6 is provided on the front side of the front cover plate 1, a moving impeller 7 driven by the motor 6 is provided in the second premixing chamber 5, and a guide vane 8 is installed in the volute rear cover 3.

[0019] A first groove 2b is formed at the contact point between the front cover 2 of the volute and the air passage plate. An O-ring is provided in the first groove 2b. The O-ring can improve the sealing between the front cover plate 1 and the front cover 2 of the volute.

[0020] The moving impeller 7 is rotatably mounted on the motor shaft 6a of the motor 6. A screw is provided at one end of the motor shaft 6a, which fixes the moving impeller 7 to the motor shaft 6a. The motor 6 drives the moving impeller 7 to rotate, generating negative air pressure at the air inlet 2a, which draws the oxygen and fuel gas in the first premixing chamber 4 into the second premixing chamber 5. The moving impeller 7 can accelerate the mixing of oxygen and fuel gas.

[0021] The front end cover 2 of the volute has a first arc-shaped surface 2c that fits the arc of the fan blades on the impeller 7. The first arc-shaped surface 2c extends to the end of the air inlet 2a and has a second groove 2d. The second groove 2d is used to prevent gas backflow.

[0022] The guide vane 8 is embedded in the rear end cover 3 of the volute in a designated direction, and is fixed to the rear end cover 3 of the volute with screws. The guide vane 8 extends the path of oxygen and fuel gas, making the mixing more thorough and the combustion efficiency of the burner higher.

[0023] The rear end of the front cover 2 of the volute has a first mounting part 2e, and the front end of the rear cover 3 of the volute has a second mounting part 3b that is fitted with the first mounting part 2e. The first mounting part 2e and the second mounting part 3b are engaged and then fixed with screws, making installation convenient and quick.

[0024] When the fan is running, oxygen and gas enter the first premixing chamber 4 through the air inlet 1a of the front cover plate 1. Then, oxygen and gas enter the second premixing chamber 5 through the air inlet 2a. Oxygen and gas pass through the moving impeller 7 and the guide vane 8 in sequence, and finally the mixed gas is discharged from the mixed exhaust port 3a.

[0025] The fan in this embodiment has a small radial dimension, saving space and cost, and its neat appearance facilitates assembly. Oxygen and fuel gas can only pass through the aforementioned path, reducing the risk of fuel gas leakage. The long path traveled by oxygen and fuel gas allows for thorough mixing and high combustion efficiency. The motor 6 has a sealed structure, is dustproof and waterproof, and extends its service life.

[0026] The preferred embodiment of this utility model has been described, and various changes or modifications made by those skilled in the art will not depart from the scope of this utility model.

Claims

1. A side-inlet straight-through premixing fan comprising a front end cover plate (1), a volute front end cover (2) and a volute rear end cover (3), characterized in that: The front cover plate (1) is installed at the front end of the front cover plate (2) of the volute, and the rear cover plate (3) of the volute is installed at the rear end of the front cover plate (2). The front cover plate (1) has a plurality of air inlets (1a) evenly distributed for oxygen and fuel gas to enter. There is a first premixing chamber (4) between the front cover plate (1) and the front cover plate (2) of the volute, and a second premixing chamber (5) between the front cover plate (2) of the volute and the rear cover plate (3) of the volute. The front cover plate (2) of the volute has an air inlet (2a) for gas to enter the second premixing chamber (5) from the first premixing chamber (4). The rear cover plate (3) of the volute has a mixing exhaust port (3a). A motor (6) is provided on the front side of the front cover plate (1). A moving impeller (7) driven by the motor (6) is provided in the second premixing chamber (5). A guide vane (8) is installed in the rear cover plate (3).

2. The straight-through type premixing fan of claim 1, wherein: A first groove (2b) is formed at the contact point between the front end cover (2) of the volute and the air passage plate, and an O-ring is provided in the first groove (2b).

3. The straight-through type premixing fan of claim 2, wherein: The impeller (7) is rotatably mounted on the motor shaft (6a) of the motor (6), and a screw is provided at one end of the motor shaft (6a).

4. The straight-through type premixing fan of claim 3, wherein: The front end cover (2) of the volute is provided with a first arc-shaped surface (2c) that fits the arc of the blade of the impeller (7); a second groove (2d) is provided at one end of the first arc-shaped surface (2c) extending to the air inlet (2a).

5. The side-inlet through-flow type premixing fan according to claim 4, characterized in that: The guide wheel (8) is embedded in the rear end cover (3) of the volute in a specified direction, and the guide wheel (8) is fixed to the rear end cover (3) of the volute by screws.

6. A side-inlet direct-flow premixed fan according to claim 5, characterized in that: The rear end of the front cover (2) of the volute is provided with a first mounting part (2e), and the front end of the rear cover (3) of the volute is provided with a second mounting part (3b) that is fitted to the first mounting part (2e).

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