Negative-pressure vacuum high-speed centrifugal fan

Abstract

The utility model relates to the field of fans, in particular to a negative-pressure vacuum high-speed centrifugal fan which comprises a fan body, an impeller, an air outlet connecting block, a base and a sealing connecting assembly. One end of the fan body is provided with the air outlet connecting block used for discharging air flow, the end, away from the air outlet connecting block, of the fan body is provided with the impeller used for forming negative pressure, the bottom end of the fan body is provided with the base used for providing stable supporting, and one side of the impeller is provided with the sealing connecting assembly providing high sealing performance. The sealing assembly comprises a sealing connecting pipe, one end of the sealing connecting pipe is provided with an air inlet in a penetrating mode, the surface of the air inlet is provided with an airflow guiding arc, the end, located on the outer side of the air inlet, of the sealing connecting pipe is sleeved with a sealing ring, and the airflow guiding arc of the air inlet optimizes an air inlet path, reduces turbulent flow and is matched with the sealing ring to strictly limit air leakage in the initial air inlet stage. The sealing ring between the air outlet connecting block and the fan body is tightly attached, the pressure bearing capacity is high, and high-pressure seepage is completely eradicated.

Description

Technical Field

[0001] This utility model relates to the field of fans, and in particular to a negative pressure vacuum high-speed centrifugal fan. Background Technology

[0002] A negative pressure vacuum high-speed centrifugal fan is a device that uses the rotation of an impeller to generate centrifugal force, creating negative pressure to draw in gas, and then discharges the gas after the impeller accelerates and pressurizes it. It has a wide range of applications in ventilation, pneumatic conveying, and many other fields.

[0003] Most existing negative pressure vacuum high-speed centrifugal blowers use pipeline connections, which leads to a certain degree of gas leakage. This may not only affect the stability of the negative pressure generated by the blower, but also hinder the improvement of its overall working efficiency. The airtightness of the outlet connection also has room for improvement. Under pressure, a small amount of gas may leak out from the connection. In some applications with high pressure control requirements, this may cause pressure fluctuations to exceed the expected range, thereby indirectly affecting the subsequent processes connected to it and failing to ensure that the accuracy and stability of gas delivery reach the optimal state.

[0004] Therefore, to address the issues of existing negative pressure vacuum high-speed centrifugal fans, which are mostly connected by pipes, allowing gas to easily escape and affecting negative pressure stability and working efficiency, and having poor outlet connection sealing, resulting in a small amount of gas leakage under high pressure, causing unexpected pressure fluctuations in demanding scenarios, interfering with subsequent processes, and affecting the accuracy and stability of gas delivery, a new negative pressure vacuum high-speed centrifugal fan can be designed. This fan uses a sealed connection component, an airflow guiding arc at the inlet to optimize the air intake path and reduce turbulence, and a sealing ring to strictly limit gas leakage in the initial stage of air intake. Utility Model Content

[0005] To overcome the problems of existing negative pressure vacuum high-speed centrifugal fans that are mostly connected by pipes, which makes it easy for gas to escape, affecting the stability of negative pressure and working efficiency, and the poor sealing of the gas outlet connection, which causes a small amount of gas to seep out under high pressure, resulting in unexpected pressure fluctuations in high-requirement scenarios, interfering with subsequent processes, and affecting the accuracy and stability of gas delivery.

[0006] The technical solution of this utility model is as follows: a negative pressure vacuum high-speed centrifugal fan, comprising a fan body, an impeller, an air outlet connection block, a base, and a sealing connection assembly; an air outlet connection block for discharging airflow is installed at one end of the fan body, an impeller for generating negative pressure is installed at the end of the fan body away from the air outlet connection block, a base for providing stable support is installed at the bottom of the fan body, and a sealing connection assembly for providing high sealing performance is installed on one side of the impeller. The sealing assembly includes a sealing connection pipe, an air inlet is opened through one end of the sealing connection pipe, an airflow guiding arc is opened on the surface of the air inlet, and a sealing ring is sleeved on one end of the sealing connection pipe outside the air inlet.

[0007] Preferably, when the fan starts, the impeller begins to rotate at high speed. The rotation of the impeller will generate a negative pressure environment in the fan body. The negative pressure causes the outside air to be drawn into the fan through the sealed connection component under the action of the pressure difference. The drawn-in air gains kinetic energy under the action of the impeller. The blades of the impeller rotate at high speed, pushing the air to rotate and accelerate. According to the momentum theorem, the force exerted by the impeller on the air changes the momentum of the air, thereby accelerating the air. The pressurized air is discharged through the air outlet connection block at one end of the fan body.

[0008] Preferably, a fastening ring is fitted around the outside of the sealing connection pipe. The fastening ring has multiple sets of threaded fastening holes that are circumferentially opened, and fastening screws are installed in each of the threaded fastening holes.

[0009] Preferably, a hub is fitted on the outside of the sealing connection pipe on one side of the fastening ring, and a pressure relief screw is installed through the outside of the hub.

[0010] Preferably, an information sign is mounted on the outside of the impeller, and a mounting slot for mounting the information sign is provided on the outside of the impeller.

[0011] Preferably, the top of the air outlet connection block is connected to an air outlet pipe, and a sealing ring is fitted at the connection between the air outlet connection block and the fan body.

[0012] As a preferred embodiment, the fan body has multiple sets of threaded holes on its outer ring, and fixing plates are installed on both sides of the base. Two sets of symmetrical fixing holes are opened through the top of the fixing plates near one edge.

[0013] Preferably, the top of the base has a mounting groove, and two sets of support plates are symmetrically installed in the mounting groove. The support plates are L-shaped.

[0014] The beneficial effects of this invention are as follows: Traditional blowers are prone to gas leakage due to pipe connections, affecting negative pressure stability and efficiency. This device uses a sealed connection component, and the airflow guiding arc at the air inlet optimizes the air intake path, reducing turbulence. Combined with a sealing ring, gas leakage is strictly limited at the initial stage of air intake. For example, in chemical raw material pneumatic conveying systems, traditional blowers cause raw material escaping and insufficient conveying pressure due to air intake leakage, affecting production continuity and product quality. This device can ensure stable negative pressure, accurately control the amount and speed of raw material conveying, and improve production efficiency. Existing blowers have poorly sealed air outlet connections, and gas seepage under high pressure causes pressure fluctuations, interfering with subsequent processes. The sealing ring between the air outlet connection block and the blower body of this device fits tightly, has strong pressure resistance, and prevents high-pressure seepage. In the aeration system of sewage treatment plants, pressure fluctuations in traditional equipment cause unstable aeration volume and poor microbial treatment effect. Attached Figure Description

[0015] Figure 1The diagram shown is a schematic representation of the overall structure of a negative pressure vacuum high-speed centrifugal fan according to this utility model.

[0016] Figure 2 The diagram shown is a schematic representation of the impeller structure of a negative pressure vacuum high-speed centrifugal fan according to this utility model.

[0017] Figure 3 The diagram shown is a schematic representation of the base structure of a negative pressure vacuum high-speed centrifugal fan according to this utility model.

[0018] Figure 4 The diagram shown is a partial structural schematic of the sealing component of a negative pressure vacuum high-speed centrifugal fan according to this utility model.

[0019] Explanation of reference numerals in the attached drawings: 1. Fan body; 2. Impeller; 3. Air outlet connection block; 101. Threaded hole; 4. Base; 201. Information board; 301. Air outlet pipe; 302. Sealing ring; 401. Support plate; 402. Fixing hole; 403. Fixing plate; 501. Air inlet; 502. Sealing ring; 503. Fastening ring; 504. Hub; 505. Sealing connection pipe. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Please see Figures 1-4 This utility model provides an embodiment: a negative pressure vacuum high-speed centrifugal fan, including a fan body 1, an impeller 2, an air outlet connection block 3, a base 4, and a sealing connection assembly; an air outlet connection block 3 for discharging airflow is installed at one end of the fan body 1, an impeller 2 for generating negative pressure is installed at the end of the fan body 1 away from the air outlet connection block 3, a base 4 for providing stable support is installed at the bottom of the fan body 1, and a sealing connection assembly for providing high sealing performance is installed on one side of the impeller 2. The sealing assembly includes a sealing connection pipe 505, an air inlet 501 is opened through one end of the sealing connection pipe 505, and an airflow guide is formed on the surface of the air inlet 501. The guide arc and sealing connection pipe 505 are fitted with a sealing ring 502 on one end outside the air inlet 501. When the fan starts, the impeller 2 starts to rotate at high speed. The rotation of the impeller 2 will generate a negative pressure environment in the fan body 1. The negative pressure causes the external air to be drawn into the fan through the sealing connection component under the action of the pressure difference. The drawn-in air gains kinetic energy under the action of the impeller 2. The blades of the impeller 2 rotate at high speed, pushing the air to rotate and accelerate. According to the momentum theorem, the force exerted by the impeller 2 on the air changes the momentum of the air, thereby accelerating the air. The pressurized air is discharged through the air outlet connection block 3 at one end of the fan body 1.

[0022] Please see Figures 2-3In this embodiment, a fastening ring 503 is fitted around the sealing connecting pipe 505. The fastening ring 503 has multiple sets of threaded fastening holes circumferentially extending through it, each containing a fastening screw. The fastening ring 503 tightly wraps around the sealing connecting pipe 505. After the multiple sets of fastening screws are screwed into the threaded fastening holes, uniform radial pressure is applied to the sealing connecting pipe 505, effectively preventing displacement or loosening of the sealing connecting pipe 505 during fan operation due to vibration, airflow impact, or other factors. A hub 504 is fitted around the sealing connecting pipe 505 on one side of the fastening ring 503. The 504 has a pressure relief screw installed through it. When the internal pressure of the fan rises abnormally, such as due to pipe blockage or sudden changes in operating conditions causing poor airflow, the internal pressure may exceed the normal range. At this time, the excessive pressure can be released by loosening the pressure relief screw, which prevents the pressure from accumulating and damaging the impeller 2, sealing connection pipe 505 and other internal components of the fan. This prevents the impeller 2 from deforming due to excessive pressure and the seals from failing due to excessive pressure, effectively extending the service life of the fan components, reducing equipment maintenance costs and downtime, and ensuring the stable operation of the fan.

[0023] Please see Figures 3-4 In this embodiment, an information plate 201 is installed on the outside of the impeller 2. The impeller 2 has an installation slot for installing the information plate 201. The information plate 201 can record key information of the impeller 2, such as model, specifications, production date, batch, speed range, material, and maintenance cycle. When the fan needs to be maintained, repaired, or parts replaced, the maintenance personnel can quickly and intuitively obtain the relevant parameters of the impeller 2 through the information plate 201 without having to consult a large number of equipment documents or drawings. The top of the air outlet connection block 3 is connected to the air outlet pipe 301. A sealing ring 302 is fitted at the connection between the air outlet connection block 3 and the fan body 1. The air outlet pipe 301 provides a clear and smooth exhaust channel for the air after being pressurized by the fan. Its structural design matches the air outlet characteristics of the fan, which can effectively reduce the turbulence and energy loss of the airflow, so that the gas can be delivered to the designated location at a higher pressure and a stable flow rate, meeting the strict requirements of gas flow and pressure in various application scenarios such as pneumatic conveying in industrial production and directional exhaust in ventilation systems.

[0024] Please see Figures 3-4In this embodiment, the fan body 1 has multiple sets of threaded holes 101 circumferentially formed on its exterior. Fixing plates 403 are installed on both sides of the base 4. Two sets of symmetrical fixing holes 402 are formed through the top of the fixing plate 403 near one edge. The fixing plate 403 and its fixing holes 402 provide a stable installation foundation for the fan. When the fan is installed on the ground, equipment platform, or other supporting structure, bolts and other connecting parts are used to engage with the fixing holes 402, allowing the fan to be tightly connected to the mounting surface. This effectively resists the vibration, impact, and torque generated during fan operation, preventing displacement, shaking, or tilting of the fan. The top of the base 4 has an installation groove, in which two sets of support plates 401 are symmetrically installed. The support plates 401 are L-shaped, and their unique shape provides excellent support. One end is fixed in the installation groove, forming a stable connection with the base 4, while the other end extends upwards, providing reliable support for the fan body 1.

[0025] During operation, before starting the negative pressure vacuum high-speed centrifugal fan, the entire device is stably placed on the base 4. Two sets of L-shaped support plates 401, symmetrically installed in the mounting groove at the top of the base 4, support the fan body 1, ensuring it is in a suitable installation position. Simultaneously, the fixing holes 402 on the fixing plates 403 on both sides of the base 4, in conjunction with external fixing structures, use bolts and other connecting parts to firmly fix the entire fan, preventing displacement during subsequent operation. Air entering the sealed connecting pipe 505 continues to flow towards the impeller 2. Under the centrifugal force generated by the high-speed rotation of the impeller 2, the air is accelerated by the impeller 2 and thrown into the internal space of the fan body 1, that is, moving from the center to the edge of the impeller 2. During this process, the kinetic energy of the air is greatly enhanced, and as the air continues to flow in the special structures such as the volute inside the fan body 1, its kinetic energy is gradually converted into pressure energy, causing the air pressure to continuously increase. The fastening ring 503 fitted outside the sealed connecting pipe 505 and the fastening rings installed on it... The fastening screws play a crucial role, applying a stable tightening force to the sealing connection pipe 505. This ensures that the sealing connection pipe 505 remains firmly in its position even under conditions such as high-speed airflow and impeller 2 vibration, maintaining the structural integrity of the entire air intake channel and guaranteeing normal air delivery. The hub 504, located on one side of the fastening ring 503 outside the sealing connection pipe 505, serves as an auxiliary support. Furthermore, the pressure relief screw installed through it remains closed during normal operation. When the pressure inside the fan becomes too high due to certain abnormalities, some pressure can be released by loosening the pressure relief screw, preventing damage to the fan components due to excessive pressure. The pressurized air flows to the air outlet connection block 3 at one end of the fan body 1. The air outlet pipe 301 connected to the top of the air outlet connection block 3 provides a channel for the pressurized air to be discharged, allowing the air to be delivered to the required location in a predetermined direction, such as the exhaust port in a ventilation system or the material conveying pipeline in a pneumatic conveying system.

[0026] Through the above steps, when the fan starts, the impeller 2 begins to rotate at high speed. The rotation of the impeller 2 will generate a negative pressure environment inside the fan body 1. The negative pressure causes the external air to be drawn into the fan through the sealed connection assembly under the action of the pressure difference. The drawn-in air gains kinetic energy under the action of the impeller 2. The blades of the impeller 2 rotate at high speed, pushing the air to rotate and accelerate. According to the momentum theorem, the force exerted by the impeller 2 on the air changes the momentum of the air, thereby accelerating the air. The pressurized air is discharged through the air outlet connection block 3 at one end of the fan body 1.

Claims

1. A negative pressure vacuum high-speed centrifugal fan, comprising a fan body (1); characterized in that: It also includes an impeller (2), an exhaust connection block (3), a base (4), and a sealing connection assembly; an exhaust connection block (3) for exhausting airflow is installed at one end of the fan body (1), an impeller (2) for forming negative pressure is installed at the end of the fan body (1) away from the exhaust connection block (3), a base (4) for providing stable support is installed at the bottom of the fan body (1), and a sealing connection assembly for providing high sealing performance is installed on one side of the impeller (2). The sealing assembly includes a sealing connection pipe (505), an air inlet (501) is opened through one end of the sealing connection pipe (505), an airflow guiding arc is opened on the surface of the air inlet (501), and a sealing ring (502) is sleeved on the outside of the air inlet (501) at one end of the sealing connection pipe (505).

2. The negative pressure vacuum high-speed centrifugal fan according to claim 1, characterized in that: A fastening ring (503) is fitted on the outside of the sealing connection pipe (505). The fastening ring (503) has multiple sets of threaded fastening holes through it, and fastening screws are installed in each of the threaded fastening holes.

3. The negative pressure vacuum high-speed centrifugal fan according to claim 1, characterized in that: A hub (504) is fitted on the outside of the sealing connection pipe (505) on one side of the fastening ring (503), and a pressure relief screw is installed through the outside of the hub (504).

4. The negative pressure vacuum high-speed centrifugal fan according to claim 1, characterized in that: An information sign (201) is installed on the outside of the impeller (2), and an installation slot for installing the information sign (201) is provided on the outside of the impeller (2).

5. A negative pressure vacuum high-speed centrifugal fan according to claim 1, characterized in that: The top of the air outlet connecting block (3) is connected to an air outlet pipe (301), and a sealing ring (302) is fitted at the connection between the air outlet connecting block (3) and the fan body (1).

6. A negative pressure vacuum high-speed centrifugal fan according to claim 1, characterized in that: The fan body (1) has multiple sets of threaded holes (101) on its outer ring. The base (4) has fixing plates (403) installed on both sides. The top of the fixing plate (403) has two sets of symmetrical fixing holes (402) through it near one edge.

7. A negative pressure vacuum high-speed centrifugal fan according to claim 1, characterized in that: The base (4) has an installation groove at the top, and two sets of support plates (401) are symmetrically installed in the installation groove. The support plates (401) are L-shaped.

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