Integrated double-impeller centrifugal fan

Abstract

The utility model discloses an integrated double-impeller centrifugal fan which comprises a control module and a centrifugal fan shell, the interior of the centrifugal fan shell is divided into two relatively independent air cavities by a partition plate, and an air inlet and an air outlet are formed in the side wall, where each air cavity is located, of the centrifugal fan shell. An impeller is arranged in each air cavity, a variable frequency motor is correspondingly arranged outside each air cavity, and an output shaft of each variable frequency motor is coaxially connected with the impeller in the corresponding air cavity so as to drive the impeller to rotate. A self-cooling fan is sleeved on the variable frequency motor output shaft between the motor shell and the centrifugal fan shell in each variable frequency motor, and the control module is electrically connected with the two variable frequency motors. The utility model has the advantages of various working modes, good heat dissipation effect, compact structure and convenience in maintenance.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field, concretely relates to integrated double-impeller centrifugal fan. BACKGROUND

[0002] Centrifugal fan is an important air supply device, and is widely applied in many industrial production, ventilation and air treatment fields. The traditional centrifugal fan has the following shortcomings:

[0003] (1) The traditional centrifugal fan usually has only one impeller and one air cavity, and the performance parameters such as air volume and air pressure are relatively fixed, so it is difficult to meet the requirements of different air volume and air pressure combinations under some complex working conditions.

[0004] (2) In the use scene of the dryer and other conveying media for hot air, since the centrifugal fan transports hot air, the heat of the hot air is transmitted to the motor output shaft through the centrifugal fan shell, and then transmitted to the motor body through the motor output shaft, so that the temperature of the motor body is easily rapidly increased, affecting the service life and working stability of the motor.

[0005] (3) In the use scene of two fans in cooperation, in order to avoid the air inlet competition and air outlet collision of the two fans, the two fans must be arranged at a distance, which leads to a large increase in system land occupation. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing an integrated double-impeller centrifugal fan with multiple working modes, good heat dissipation effect, compact structure and convenient maintenance.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an integrated double-impeller centrifugal fan, comprising a control module and a centrifugal fan shell, the inside of the centrifugal fan shell is divided into two relatively independent air cavities by a partition plate, an air inlet and an air outlet are arranged on the side wall of the centrifugal fan shell where each air cavity is located, one impeller is arranged in each air cavity, one variable frequency motor is correspondingly arranged outside each air cavity, the output shaft of each variable frequency motor is coaxially connected with the impeller in the corresponding air cavity to drive the impeller to rotate, a self-heat dissipation fan is sleeved on the variable frequency motor output shaft between the motor shell and the centrifugal fan shell in each variable frequency motor, and the control module is electrically connected with the two variable frequency motors.

[0008] Further, the aforementioned integrated double-impeller centrifugal fan, wherein: a thermistor for real-time detection of the motor shell temperature and signal connection with the control module is arranged on each variable frequency motor.

[0009] Further, the integral double-impeller centrifugal fan as claimed in the preceding, wherein: a maintenance door is arranged at each maintenance opening on the side wall of the centrifugal fan shell, and the maintenance door is detachably mounted on the corresponding maintenance opening by bolts.

[0010] Further, the integral double-impeller centrifugal fan as claimed in the preceding, wherein: each variable frequency motor is mounted on the side wall of the centrifugal fan shell by a damping support.

[0011] Further, the integral double-impeller centrifugal fan as claimed in the preceding, wherein: a protective grille is arranged around the outer part of the self-heat dissipation fan corresponding to each variable frequency motor.

[0012] Further, the integral double-impeller centrifugal fan as claimed in the preceding, wherein: the air inlets of the two air chambers are located on the same side, the air outlets of the two air chambers are adjacent and arranged side by side, and a butt flange is arranged on the centrifugal fan shell at the air outlet, which simultaneously connects and communicates the two air outlets.

[0013] Through the implementation of the above technical solutions, the integral double-impeller centrifugal fan has the following advantages:

[0014] (1) The double-air chamber and double-impeller structure are adopted, and the independent variable frequency motor driving is used, so that the running state of the two variable frequency motors can be controlled by the control module, and various working modes such as simultaneous operation of the two motors and operation of a single motor can be realized, thereby meeting the diversified demand for air volume and air pressure under different working conditions. Whether it is precise adjustment of small air volume or output of large air volume, the precise output of different air pressure and air volume can be realized by adjusting the rotating speed and operation combination of the two variable frequency motors, and the applicability of the fan is greatly improved.

[0015] (2) The self-heat dissipation fan on the motor output shaft can actively dissipate heat. When the motor is running, the self-heat dissipation fan rotates with the motor output shaft, timely removes the heat generated by the motor and the heat transferred from the centrifugal fan shell, reduces the temperature of the motor, effectively solves the problem of poor heat dissipation of the motor in the traditional centrifugal fan in a high-temperature environment, improves the stability and reliability of the motor, and prolongs the service life of the motor.

[0016] (3) Since the double-motor independent driving structure is adopted, when a single motor fails, the other motor can continue to maintain the system operation, greatly improves the system reliability, and is suitable for places such as medical treatment and chemical industry where ventilation cannot be interrupted, thereby avoiding production interruption or safety problems caused by fan failure.

[0017] (4) The integral double-impeller centrifugal fan has a more compact overall structure, and the occupied area is significantly reduced compared with the traditional fan with the same function, which is especially suitable for use scenes where two fans are needed to cooperate and the space is limited. The integral double-impeller centrifugal fan improves the space utilization rate, and is convenient for transportation, installation and later maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The structure diagram of the integrated double-impeller centrifugal fan is shown.

[0019] Figure 2 The Figure 1 top view.

[0020] Figure 3 The Figure 1 right view.

[0021] Figure 4 The Figure 3 structure diagram after the protective grating is hidden. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail by combining with the drawings and examples.

[0023] For example, Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the integrated double-impeller centrifugal fan comprises a control module and a centrifugal fan shell 1, the inside of the centrifugal fan shell 1 is divided into two relatively independent and symmetrical air chambers 3 by a partition plate 2, an air inlet 4 and an air outlet 5 are arranged on the side wall of the centrifugal fan shell 1 where each air chamber 3 is located, the air inlets 4 of the two air chambers 3 are located on the same side, the air outlets 5 of the two air chambers 3 are adjacent and side by side, a butt flange 13 that simultaneously connects and communicates the two air outlets 5 is arranged on the centrifugal fan shell 1 at the air outlet 5, an impeller 6 is arranged in each air chamber 3, a variable frequency motor 7 is correspondingly arranged outside each air chamber 3, the output shaft of each variable frequency motor 7 is coaxially connected with the impeller 6 in the corresponding air chamber 3 to drive the impeller 6 to rotate, a self-heat dissipation fan 8 is sleeved on the variable frequency motor output shaft 72 between the motor shell and the centrifugal fan shell 1 of each variable frequency motor 7, the control module is electrically connected with the two variable frequency motors 7, in this embodiment, a thermistor for detecting the temperature of the motor shell in real time and being signal-connected with the control module is arranged on each variable frequency motor 7, the control module collects and analyzes the signal fed back by the thermistor in real time, and an alarm is given when it is analyzed that the current shell temperature of the variable frequency motor exceeds a safety threshold value, a maintenance opening is arranged on the side wall where each air chamber 3 is located, a maintenance door 9 is arranged at each maintenance opening, the maintenance door 9 is detachably installed on the corresponding maintenance opening through bolts 10, the arrangement of the maintenance door 9 facilitates the maintenance and repair of the internal components of the air chamber 3 and improves the maintenance efficiency, a filter screen is arranged at the air inlet 4 of each air chamber 3, the filter screen can filter impurities in the air, prevent the impurities from causing abrasion and damage to the internal components such as the impeller and the motor, reduce the maintenance frequency and cost of the fan, and also ensure the long-term stable operation of the fan, in this embodiment, each variable frequency motor 7 is installed on the side wall of the centrifugal fan shell 1 where the corresponding air chamber 3 is located through a damping support 11, the damping support 11 comprises an elastic damping pad arranged between the motor and the volute, the elastic damping pad can effectively reduce the vibration generated during the operation of the motor and transmitted to the volute, reduce the noise during the operation of the equipment, and improve the stability of the equipment, in this embodiment, a protective grating 12 for protection is arranged around the outside of each self-heat dissipation fan 8 of the variable frequency motor 7.

[0024] During operation, the control module controls the running states of the two variable frequency motors 7 according to actual requirements to realize different working modes, during the operation of the variable frequency motor 7, the self-heat dissipation fan 8 rotates with the motor output shaft 72 to timely take away the heat generated by the variable frequency motor 7 and the heat transmitted from the centrifugal fan shell 1, at the same time, the thermistor on the variable frequency motor 7 detects the temperature of the motor shell in real time and feeds back to the control module in real time, the control module collects and analyzes the signal fed back by the thermistor in real time, and an alarm is given when it is analyzed that the current shell temperature of the variable frequency motor exceeds a safety threshold value.

[0025] The utility model discloses the advantages are:

[0026] (1) The double air chamber and double impeller structure are adopted, and the independent variable frequency motor is driven, the running state of the two variable frequency motors can be controlled through the control module, various working modes such as two motors running simultaneously and single motor running are realized, the diversified demand for air volume and air pressure under different working conditions is met, whether the precise regulation of small air volume or the output of large air volume can realize the precise output of different air pressure and air volume by adjusting the rotating speed and running combination of the two variable frequency motors, the applicability of the fan is greatly improved;

[0027] (2) The self-heat dissipation fan on the motor output shaft can actively dissipate heat, when the motor runs, the self-heat dissipation fan rotates with the motor output shaft, and the heat generated by the motor and the heat transferred from the centrifugal fan shell are taken away in time, the motor temperature is reduced, the problem of poor heat dissipation of the traditional centrifugal fan in high temperature environment is solved, the stability and reliability of the motor are improved, and the service life of the motor is prolonged;

[0028] (3) Since the double motor independent driving structure is adopted, when a single motor fails, the other motor can continue to maintain the system operation, the system reliability is greatly improved, and it is suitable for medical, chemical and other places where ventilation cannot be interrupted, and the production interruption or safety problem caused by fan failure is avoided;

[0029] (4) The overall structure of the integrated double-impeller centrifugal fan is more compact, the occupied area is significantly reduced compared with the traditional similar function fan, especially suitable for the use scene that two fans need to cooperate and the space is limited, the space utilization is improved, and transportation, installation and later maintenance are facilitated.

[0030] The above only describes the preferred embodiments of the utility model, and does not limit the utility model in any other form, and any modification or equivalent change according to the technical essence of the utility model still belongs to the protection range of the utility model.

Claims

1. An integrated double-impeller centrifugal fan, characterized in that: The system includes a control module and a centrifugal fan housing. The interior of the centrifugal fan housing is divided into two relatively independent air chambers by a partition. An air inlet and an air outlet are provided on the side wall of the centrifugal fan housing in each air chamber. An impeller is provided inside each air chamber, and a variable frequency motor is provided on the outside of each air chamber. The output shaft of each variable frequency motor is coaxially connected to the impeller in the corresponding air chamber to drive the impeller to rotate. A self-cooling fan is installed on the output shaft of each variable frequency motor located between the motor housing and the centrifugal fan housing. The control module is electrically connected to the two variable frequency motors.

2. The integrated double-impeller centrifugal fan according to claim 1, characterized in that: Each variable frequency motor is equipped with a thermistor for real-time detection of the motor casing temperature and for connection to the control module signal.

3. The integrated double-impeller centrifugal fan according to claim 1, characterized in that: An inspection port is provided on the side wall of each air chamber, and an inspection door is provided at each inspection port. The inspection door is detachably installed on the corresponding inspection port by bolts.

4. The integrated double-impeller centrifugal fan according to claim 1, characterized in that: Each variable frequency motor is mounted on the side wall of the centrifugal fan casing where the corresponding air chamber is located via a shock-absorbing bracket.

5. The integrated double-impeller centrifugal fan according to claim 1, characterized in that: A protective grille is installed around the outside of the self-cooling fan corresponding to each variable frequency motor.

6. The integrated double-impeller centrifugal fan according to claim 1, characterized in that: The air inlets of the two air chambers are located on the same side, and the air outlets of the two air chambers are adjacent to each other. A connecting flange is provided on the centrifugal fan casing at the air outlet to connect the two air outlets simultaneously.

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