Small-size induced draft fan

Abstract

The small-size induced draft fan comprises a volute, a wind wheel, a motor, a pressure measuring connector device and a volute cover plate, the volute is provided with an air outlet communicated with a cavity, the volute cover plate is provided with an air inlet communicated with the cavity, the motor is installed outside the top of the volute, and the pressure measuring connector device is installed on the motor. A cavity is formed in the top plate, a shaft hole is formed in the top plate, a rotating shaft of the motor penetrates through the shaft hole and extends into the cavity to be connected with the wind wheel, and the pressure measuring connector device is installed on the top of the volute. The outer static pressure ring sleeves the periphery of the inner static pressure ring, a static pressure detection groove is formed in the middle of the outer static pressure ring, the top plate is provided with a pressure measurement through hole, the pressure measurement through hole is located in the top of the detection groove, and the pressure measurement interface device is installed at the pressure measurement through hole to detect the internal static pressure of the volute. The arrangement of the outer static pressure ring, the inner static pressure ring and the static pressure detection groove facilitates the formation of a high static pressure area in the static pressure detection groove, and improves the static pressure of a pressure tapping port of the pressure measurement through hole.

Description

Technical Field

[0001] This utility model relates to a small-volume induced draft fan. Background Technology

[0002] Our company currently has a Model 90 induced draft fan, the specific structure of which can be found in the patent number: 201910371234.X, patent name: volute assembly of induced draft fan and utility model patent of induced draft fan. It has the following shortcomings: 1. The volute of the existing Model 90 induced draft fan is very large, resulting in a large load volume; 2. It uses an AC motor, which has low efficiency, low speed, and cannot be steplessly speed adjusted; 3. Low static pressure efficiency; 4. Low static pressure at the pressure tap, making it difficult to extract signals. Summary of the Invention

[0003] The purpose of this invention is to provide a small-volume induced draft fan that solves the technical problem of low static pressure at the pressure tapping port of existing induced draft fans, which makes signal extraction difficult.

[0004] A further objective of this invention is to provide a small-volume induced draft fan, which solves the technical problem that existing induced draft fans are large in size, resulting in a large load volume and low efficiency.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A small-volume induced draft fan includes a volute, a impeller, a motor, a pressure measuring interface device, and a volute cover plate. The volute cover plate is installed at the bottom of the volute, forming a cavity in the middle. The volute has an air outlet communicating with the cavity, and the volute cover plate has an air inlet communicating with the cavity. The motor is installed on the outside of the top of the volute. A shaft hole is opened on the top plate of the volute, through which the motor shaft passes and extends into the cavity to connect with the impeller. The pressure measuring interface device is installed on the top of the volute. The key feature is that an inner static pressure ring and an outer static pressure ring are protruding from the outer periphery of the shaft hole and on the top plate. The inner and outer static pressure rings are located inside the cavity. The outer static pressure ring is fitted around the inner static pressure ring, forming a static pressure detection groove in the middle. A pressure measuring through hole is provided on the top plate, located at the top of the detection groove. The pressure measuring interface device is installed at the position of the pressure measuring through hole to detect the internal static pressure of the volute.

[0007] The aforementioned inner static pressure ring is higher than the outer static pressure ring.

[0008] The aforementioned wind turbine includes an upper rotor, a lower rotor, and rotor blades located between the upper and lower rotors. Several negative pressure blades protrude from the top of the upper rotor. The inner tangent diameter of the negative pressure blades is larger than the outer diameter of the inner static pressure ring, and the inner tangent diameter of the negative pressure blades is smaller than the diameter of the outer static pressure ring. The top of the negative pressure blades is higher than the bottom of the inner static pressure ring, and the top of the negative pressure blades is lower than the bottom of the outer static pressure ring, forming a high static pressure zone in the static pressure detection groove.

[0009] The air inlet of the aforementioned volute cover is off-center.

[0010] The edge of the air inlet of the aforementioned volute cover plate protrudes upwards with an annular air guide ring, which is located inside the cavity and extends into the air inlet of the impeller.

[0011] The cross-section of the aforementioned annular air guide ring is arc-shaped.

[0012] The motors mentioned above are brushless DC motors.

[0013] The aforementioned motor includes a motor body and a motor controller, with the motor controller mounted on top of the motor body.

[0014] The aforementioned motor body includes a front cover, a rear cover, a stator assembly, and a rotor assembly. Several mounting feet extend from the edge of the front cover, through which the motor is mounted on the top of the volute.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] 1. The volute of this utility model has an inner static pressure ring and an outer static pressure ring protruding from the outer periphery of the shaft hole and the top plate. The inner and outer static pressure rings are located inside the cavity. The outer static pressure ring is sleeved around the inner static pressure ring and forms a static pressure detection groove in the middle. The top plate is provided with a pressure measuring through hole, which is located at the top of the detection groove. The pressure measuring interface device is installed at the position of the pressure measuring through hole to detect the internal static pressure of the volute. The arrangement of the outer static pressure ring, the inner static pressure ring, and the static pressure detection groove is conducive to forming a high static pressure area in the static pressure detection groove, increasing the static pressure at the pressure tap of the pressure measuring through hole, and making signal extraction easier and more accurate.

[0017] 2. The wind turbine includes an upper disk, a lower disk, and wind turbine blades located between the upper and lower disks. Several negative pressure blades protrude from the top of the upper disk. The inner tangent diameter of the negative pressure blades is larger than the outer diameter of the inner static pressure ring, and the inner tangent diameter of the negative pressure blades is smaller than the diameter of the outer static pressure ring. The top of the negative pressure blades is higher than the bottom of the inner static pressure ring, and the top of the negative pressure blades is lower than the bottom of the outer static pressure ring. This is more conducive to forming a high static pressure zone in the static pressure detection groove, further improving the static pressure at the pressure tap of the pressure measuring through hole.

[0018] 3. Other advantages of this utility model are described in detail in the embodiments section. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention from one angle;

[0020] Figure 2 This is a perspective view of the present invention with the impeller and volute cover plate omitted.

[0021] Figure 3 This is an exploded view of the present invention;

[0022] Figure 4 This is a top view of the present invention;

[0023] Figure 5 for Figure 4 BB cross-sectional view. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] like Figures 1 to 5 As shown, this embodiment provides a small-volume induced draft fan, including a volute 1, an impeller 2, a motor 3, a pressure measuring interface device 4, and a volute cover plate 5. The volute cover plate 5 is installed at the bottom of the volute 1, forming a cavity 10 in the middle. The volute 1 is provided with an air outlet 11 communicating with the cavity 10, and the volute cover plate 5 is provided with an air inlet 51 communicating with the cavity 10. The motor 3 is installed on the outside of the top of the volute 1. A shaft hole 13 is opened on the top plate 12 of the volute 1, and the rotating shaft 30 of the motor 3 passes through the shaft hole 13 and extends into the cavity 10 to connect with the impeller 2. The pressure measuring interface device 4 is installed on the top of the volute 1. The device is characterized in that: an inner static pressure ring 14 and an outer static pressure ring 15 are protruding on the outer periphery of the shaft hole 13 and on the top plate 12. The inner static pressure ring 14 and the outer static pressure ring 15 are located inside the cavity 10. The outer static pressure ring 15 is sleeved on the outer periphery of the inner static pressure ring 14 and forms a static pressure detection groove 16 in the middle. The top plate 12 is provided with a pressure measuring through hole 17, which is located on the top of the detection groove 16. The pressure measuring interface device 4 is installed at the position of the pressure measuring through hole 17 to detect the internal static pressure of the volute 1.

[0026] The volute of this invention has an inner static pressure ring and an outer static pressure ring protruding from the outer periphery of the shaft hole and the top plate. The inner and outer static pressure rings are located inside the cavity. The outer static pressure ring is sleeved around the inner static pressure ring, forming a static pressure detection groove in the middle. The top plate is provided with a pressure measuring through hole, which is located at the top of the detection groove. A pressure measuring interface device is installed at the position of the pressure measuring through hole to detect the internal static pressure of the volute. The arrangement of the outer static pressure ring, the inner static pressure ring, and the static pressure detection groove is conducive to forming a high static pressure zone in the static pressure detection groove, increasing the static pressure at the pressure tap of the pressure measuring through hole, making signal extraction easier and more accurate.

[0027] The inner static pressure ring 14 is higher than the outer static pressure ring 15.

[0028] The aforementioned wind turbine 2 includes an upper rotor 21, a lower rotor 22, and rotor blades 23 located between the upper rotor 21 and the lower rotor 22. Several negative pressure blades 24 protrude from the top of the upper rotor 21. The inner tangent diameter of the negative pressure blades 24 is larger than the outer diameter of the inner static pressure ring 14, and smaller than the diameter of the outer static pressure ring 15. The top tip 241 of the negative pressure blades 24 is higher than the bottom tip of the inner static pressure ring 14, and lower than the bottom tip of the outer static pressure ring 15, forming a high static pressure zone in the static pressure detection groove 16. This makes signal extraction easier.

[0029] The air inlet 51 of the aforementioned volute cover 5 is off-center. This reduces air resistance and improves static pressure efficiency.

[0030] The edge of the air inlet 51 of the aforementioned volute cover plate 5 protrudes upward to form an annular air guide ring 52. The annular air guide ring 52 is located inside the cavity 10 and extends into the air inlet of the impeller 2, reducing air inlet leakage and mixing, thereby reducing wind resistance and improving static pressure efficiency.

[0031] The cross-section of the aforementioned annular air guide ring 52 is arc-shaped, with a simple structure and good air guiding effect.

[0032] The aforementioned motor 3 is a DC brushless motor, which is highly efficient, has a high speed, and can be steplessly speed-regulated.

[0033] The aforementioned motor 3 includes a motor body 3a and a motor controller 3b, with the motor controller 3b mounted on top of the motor body 3a.

[0034] The aforementioned motor body 3a includes a front cover 31, a rear cover 32, a stator assembly 33, and a rotor assembly 34. Several mounting feet 311 extend from the edge of the front cover 31, allowing the motor 3 to be mounted on the top of the volute 1 via these mounting feet 311. The structure is simple and easy to install.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A small-volume induced draft fan, comprising a volute (1), a fan wheel (2), a motor (3), a pressure measuring interface device (4), and a volute cover plate (5), wherein the volute cover plate (5) is installed at the bottom of the volute (1) and forms a cavity (10) in the middle, the volute (1) is provided with an air outlet (11) communicating with the cavity (10), the volute cover plate (5) is provided with an air inlet (51) communicating with the cavity (10), the motor (3) is installed on the outside of the top of the volute (1), a shaft hole (13) is opened on the top plate (12) of the volute (1), the rotating shaft (30) of the motor (3) passes through the shaft hole (13) and extends into the cavity (10) to be connected with the fan wheel (2), and the pressure measuring interface device (4) is installed on the top of the volute (1), characterized in that: An inner static pressure ring (14) and an outer static pressure ring (15) are protruding on the outer periphery of the shaft hole (13) and the top plate (12). The inner static pressure ring (14) and the outer static pressure ring (15) are located inside the cavity (10). The outer static pressure ring (15) is sleeved on the outer periphery of the inner static pressure ring (14) and forms a static pressure detection groove (16) in the middle. The top plate (12) is provided with a pressure measuring through hole (17). The pressure measuring through hole (17) is located at the top of the detection groove (16). The pressure measuring interface device (4) is installed at the position of the pressure measuring through hole (17) to detect the internal static pressure of the volute (1).

2. The small-volume induced draft fan according to claim 1, characterized in that: The inner static pressure ring (14) is higher than the outer static pressure ring (15).

3. A small-volume induced draft fan according to claim 2, characterized in that: The wind turbine (2) includes an upper disk (21), a lower disk (22), and wind turbine blades (23) located between the upper disk (21) and the lower disk (22). Several negative pressure blades (24) protrude from the top of the upper disk (21). The inner tangent diameter of the negative pressure blades (24) is larger than the outer diameter of the inner static pressure ring (14), and the inner tangent diameter of the negative pressure blades (24) is smaller than the diameter of the outer static pressure ring (15). The top end (241) of the negative pressure blades (24) is higher than the bottom end of the inner static pressure ring (14), and the top end (241) of the negative pressure blades (24) is lower than the bottom end of the outer static pressure ring (15), forming a high static pressure zone in the static pressure detection groove (16).

4. A small-volume induced draft fan according to claim 1, 2, or 3, characterized in that: The air inlet (51) of the volute cover (5) is off-center.

5. A small-volume induced draft fan according to claim 4, characterized in that: The edge of the air inlet (51) of the volute cover (5) protrudes upward to form an annular air guide ring (52), which is located inside the cavity (10) and extends into the air inlet of the impeller (2).

6. A small-volume induced draft fan according to claim 5, characterized in that: The cross-section of the annular air guide ring (52) is arc-shaped.

7. A small-volume induced draft fan according to claim 6, characterized in that: The motor (3) is a DC brushless motor.

8. A small-volume induced draft fan according to claim 7, characterized in that: The motor (3) includes a motor body (3a) and a motor controller (3b), with the motor controller (3b) mounted on top of the motor body (3a).

9. A small-volume induced draft fan according to claim 8, characterized in that: The motor body (3a) includes a front cover (31), a rear cover (32), a stator assembly (33) and a rotor assembly (34), wherein the edge of the front cover (31) extends out a number of mounting feet (311), and the motor (3) is mounted on the top of the volute (1) by means of the mounting feet (311).

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