Multi-host parallel sequential cut-in type high-flow fan

Abstract

The invention relates to the technical field of air supply, in particular to a multi-host parallel sequential cut-in type high-flow fan which comprises a plurality of fan hosts, pressing shells are arranged on the two sides of the fan hosts, and the first end of a first air outlet pipe is fixedly installed at an air outlet of each pressing shell; the second end of the first air outlet pipe is fixedly connected with a second air outlet pipe, the end of the second air outlet pipe is fixedly connected with the first end of a check valve, the second end of the check valve is fixedly connected with the first end of a third air outlet pipe, and the second end of the third air outlet pipe is fixedly connected with a fourth air outlet pipe. The method can be suitable for the working condition under the small-power and small-flow condition and can also be suitable for the large-flow working condition under the high-power condition of a plurality of fan hosts, and the situation that the flow is increased to exceed the optimal running efficiency of the fan is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of air supply, and in particular to a multi-host parallel sequential cut-in type large flow fan. Background Art

[0002] At present, air suspension centrifugal blowers operate with a single fan, mostly with a single pressure end fan, with a relatively high pressure of up to 100Kpa or more, but a small flow rate, or some with a double pressure end with a relatively large flow rate of up to 400 cubic meters or more, but a relatively narrow high-efficiency zone, where the efficiency of the whole machine can reach more than 70%. If high pressure or large flow rate is reached, the fan efficiency will be reduced to 60% or even lower. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a multi-host parallel sequential cut-in large flow fan, which is specifically implemented through the following technical solutions: A multi-host parallel sequential cut-in large-flow fan includes several fan hosts, compression shells are provided on both sides of the fan host, the first end of the first air outlet pipe is fixedly installed on the air outlet of each compression shell, the second end of the first air outlet pipe is fixedly connected to the second air outlet pipe, the end of the second air outlet pipe is fixedly connected to the first end of the check valve, the second end of the check valve is fixedly connected to the first end of the third air outlet pipe, the second end of the third air outlet pipe is connected to the fourth air outlet pipe, the frequency converter of the fan host is electrically connected to the PLC, and the PLC is also electrically connected to the display; a vent valve is provided on the side wall of the second air outlet pipe, the vent valve is electrically connected to the PLC, and the PLC controls the opening and closing of the vent valve to eliminate surge of the fan host.

[0004] The diameter of the second end of the third air outlet pipe is greater than the diameter of the first end of the third air outlet pipe, and the diameter of the second end of the third air outlet pipe is equal to the diameter of the fourth air outlet pipe.

[0005] The motor housing of the fan main unit is provided with a motor cooling air inlet and a motor cooling air outlet.

[0006] The vent valve is fixedly connected to the fifth air outlet pipe.

[0007] The motor cooling air outlet is fixedly connected to the fifth air outlet pipe.

[0008] The fifth air outlet pipe is fixed on the top plate through a flange.

[0009] It also includes a box body, wherein a partition is provided inside the box body, and the partition divides the inside of the box body into a plurality of installation rooms, and the plurality of fan hosts are respectively installed in the corresponding installation rooms.

[0010] One end of the box body is provided with a plurality of air inlet windows, which correspond to a plurality of installation chambers respectively. The installation chambers are provided with air inlet filters matched with the air inlet windows.

[0011] The compression shell air outlet is connected to the first air outlet pipe using a stainless steel pipe connector.

[0012] The present invention has the following beneficial technical effects: 1. It can be applied to working conditions with low power and low flow. Under the condition of constant pressure, the optimum efficiency point can be used in the minimum flow range of a single fan host. It can also adapt to high flow conditions with multiple fan hosts at high power without exceeding the optimum efficiency of the fan operation due to increased flow.

[0013] 2. It can realize production, production increase and production reduction; in occasions where the air volume changes greatly, the flow rate can be adjusted by adjusting the number of main units of the fan host according to demand, without the need to re-plan due to the narrow flow range of conventional fans, or to install additional equipment suitable for the change in production capacity.

[0014] 3. When the fan host flow reaches 500 m³ and the power reaches 300KW or even higher, the motor requirements will be higher, the motor heat dissipation will be more difficult and the cost will be higher, the volume will be larger, and the technical requirements will be higher. Multiple hosts in parallel can achieve high-power and high-flow conditions, thereby solving these problems, reducing costs, and reducing the difficulty of R&D, processing and production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 Schematic diagram of the internal structure of the box; Figure 3 This is a schematic diagram of the operation principle of the present invention; Figure 4 This is a schematic diagram of parallel connection of fan hosts; Figure 5 It is the control principle diagram of the present invention; Figure 6 This is the power diagram of two 75kw double-pressure end fans in parallel; Figure 7 This is the efficiency diagram of two 75kw double-pressure end fans in parallel; Figure 8 This is the power diagram of a single 150kw double-pressure end fan in parallel; Fig. 9 This is the parallel efficiency diagram of a single 150kw double-pressure end fan; Fig.10 The control circuit of the present invention Figure 1 ; Fig.11 The control circuit of the present invention Figure 2 ; 1- fan main unit, 2- compression shell, 3- first air outlet pipe, 4- second air outlet pipe, 5- check valve, 6- third air outlet pipe, 7- fourth air outlet pipe, 8- vent valve connection port, 9- motor cooling air outlet, 10- box body, 11- air inlet window, 12- top plate, 13- fifth air outlet pipe, 14- air inlet filter, 15- partition, 16- controller, 17- air outlet end assembly, 18- vent valve. DETAILED DESCRIPTION

[0016] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0017] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be direct installation or indirect installation; "fixed installation" and "fixed connection" can be conventional connection means in the field such as welding, riveting, interference fit, one-piece molding, etc. unless otherwise specified. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0018] As attached Figure 1 To Attachment Fig.11 As shown, the present invention provides a multi-host parallel sequential cut-in large-flow fan, including a fan host 1 with two double pressure ends, the two fan hosts 1 have the same specifications, each fan host 1 includes a motor and a compression shell 2 installed on both sides of the motor, and the air outlet of each compression shell 2 is fixedly installed with a first end of a first air outlet pipe 3, the second end of the first air outlet pipe 3 is fixedly connected to the second air outlet pipe 4, and the second air outlet pipe 4 and the two first air outlet pipes 3 form a Y-shaped structure.

[0019] The diameter of the second air outlet pipe 4 is greater than the diameter of the first air outlet pipe 3 .

[0020] The end of the second air outlet pipe 4 is fixedly connected to the first end of the check valve 5 via a flange, the second end of the check valve 5 is fixedly connected to the first end of the third air outlet pipe 6 , and the second end of the third air outlet pipe 6 is fixedly connected to the fourth air outlet pipe 7 .

[0021] The third air outlet pipe 6 is trumpet-shaped as a whole, that is, the diameter of the second end of the third air outlet pipe 6 is greater than the diameter of the first end of the third air outlet pipe 6 , and the diameter of the second end of the third air outlet pipe 6 is equal to the diameter of the fourth air outlet pipe 7 .

[0022] A vent valve connection port 8 is provided on the side wall of the second air outlet pipe 4 for installing a vent valve 18 .

[0023] The motor is an air-cooled motor, and a motor cooling air inlet and a motor cooling air outlet 9 are provided on its casing.

[0024] The two fan main units 1 and the check valve 5 are electrically connected to the controller 16 respectively, and the controller 16 is preferably a PLC control system.

[0025] An air outlet end assembly 17 is installed at the end of the fourth air outlet pipe 7. The air outlet end assembly 17 includes a muffler, a bellows compensator, and a butterfly valve which are connected in sequence.

[0026] The box body 10 is also included, and supporting feet are installed at the bottom of the box body 10.

[0027] A top plate 12 is installed on the top of the box body 10 , and an air intake window 11 is provided at one end of the box body 10 .

[0028] A partition 15 is provided inside the box body 10 , and the partition 15 divides the inside of the box body 10 into a first installation room and a second installation room. The two fan main units 1 are respectively installed inside the first installation room and the second installation room.

[0029] The check valve 5 is mounted on the top plate 12 via a flange and is located outside the box body 10 .

[0030] There are two air inlet windows 11, which correspond to the first installation chamber and the second installation chamber respectively. Air inlet filters 14 are provided at positions corresponding to the air inlet windows 11 in the first installation chamber and the second installation chamber.

[0031] Specifically, the fan host 1 is installed in the corresponding installation room in the box body 10 and fixed by bolts; the air outlet of the compression shell 2 of the fan host 1 is connected to the first air outlet pipe 3 using a stainless steel pipe connector; the stud bolts of the check valve 5 are clamped between the box body 10 and the third air outlet pipe 6.

[0032] The fan main unit 1 in this embodiment is equipped with two compressors. The pressure ends of the compression casings 2 of the two compressors of the single fan main unit 1 are connected in parallel through a second air outlet pipe 4, and the two second air outlet pipes 4 are connected in parallel through a fourth air outlet pipe 7. In this way, two, three or even more fan main units 1 can be connected in parallel.

[0033] Due to the presence of the box body 10, the overall structure of the present invention is more concise and compact.

[0034] The operation of this embodiment is that the air is filtered by the air intake filter after passing through the air intake window 11, and then the fan main unit 1 absorbs the air filtered by the air intake filter into the fan main unit 1, and after compression, the check valve 5 is pushed open through the respective second air outlet pipes 4, and the compressed gas of the fan main unit 1 is discharged after being gathered in the fourth air outlet pipe 7. In addition, the vent valve connection port 8 is connected to the vent valve 18 and is gathered together with the motor cooling air outlet 9 to the fifth air outlet pipe 13 for discharge, and is discharged through the fifth air outlet pipe 13 during exhaust. The vent valve 18 is used to prevent surging. The fifth air outlet pipe 13 is fixed to the top plate 12 by a flange. The vent valve 18 is used to relieve the pressure of the pipeline when starting and stopping the machine, prevent surging, and protect the bearings from wear.

[0035] The two pressure ends of a single fan main unit 1 are connected in parallel through a second air outlet pipe 4, and the two second air outlet pipes 4 are connected in parallel through a fourth air outlet pipe 7. In this way, two, three or even more fan main units 1 can be connected in parallel.

[0036] The whole system is controlled by PLC. Each fan host 1 can work alone, or two, three or even more can work together. The control device sends a control signal command, and the fan host 1 receives the signal to start or stop. The fan flow can be adjusted at any time by adjusting the speed.

[0037] As attached Figure 6 and attached Figure 7 As shown, in this embodiment, two 75KW double-compression end fans are connected in parallel, with a rated point of 40KPa and 80m³. When the 75KW single fan host 1 is running, the operating MAP flow range is 30m³ to 80m³, and the operating efficiency (compressor efficiency) can reach 85%-80%. The operating rated points of the two fan hosts 1 are close to 40KPa and 160m³, which is equivalent to the flow rate of the two fans at a constant pressure, and the flow range of the two fans in parallel is 30m³ to 160m³. The minimum flow point here is the minimum flow of a single fan.

[0038] As attached Figure 8 and attached Fig. 9 As shown, for a single 150KW double-pressure end fan, the rated point is 40KPa, 160m³. The flow range of this 150KW single fan is only 60m³ to 160m³, and the operating efficiency is 85%-80%.

[0039] A plurality of fan hosts 1 connected in parallel can achieve a wider range of flow usage span. Moreover, no matter how many fan hosts 1 are connected in parallel, the pressure range is the pressure range of a single fan host 1.

[0040] The motors in the fan main unit 1 in this embodiment are all variable frequency motors.

[0041] Circuit connection as attached Figure 8As shown, the PLC is electrically connected to the frequency converter of the fan host 1, and collects the frequency converter data. At the same time, the PLC is also electrically connected to the vent valve 18 and the screen display, so that the relevant data is displayed on the screen, and the motor speed and power are controlled by changing the frequency converter data.

[0042] In this example, two fan hosts 1 are used, each of which corresponds to a vent valve 18, which is briefly referred to as the attached figure for convenience of description. Figure 7 Vent valve one and vent valve two.

[0043] Attached Figure 7 In the PLC, the control module 1 controls the start and stop and emergency stop of the motor in the fan host 1, displays the operation stop through the indicator light, and collects information and data of each part through the flow, pressure transmitter and temperature sensor and presents it on the touch screen display, adjusts the flow and pressure according to the demand, and controls the opening and closing of L1, L2, and L3 to control the corresponding vent valve 18 (i.e., the attached Figure 7 The vent valve 1 in the air outlet valve 1 (K3, K3') can relieve pressure to prevent surge or open and close L1', L2', L3' to control another vent valve 18 (i.e., the attached Figure 7 The two blowers can be started and operated by controlling the opening and closing of L1'', L2'', and L3'' to relieve pressure and prevent surge through the vent valves 18 (K5, K5') in the next year.

[0044] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-host parallel sequential cut-in large flow fan, characterized by: The invention comprises a plurality of fan main units (1), wherein compression shells (2) are provided on both sides of the fan main unit (1), the first end of a first air outlet pipe (3) is fixedly mounted on the air outlet of each compression shell (2), the second end of the first air outlet pipe (3) is fixedly connected to a second air outlet pipe (4), the end of the second air outlet pipe (4) is fixedly connected to a first end of a check valve (5), the second end of the check valve (5) is fixedly connected to a first end of a third air outlet pipe (6), the second end of the third air outlet pipe (6) is connected to a fourth air outlet pipe (7), the frequency converter of the fan main unit (1) is electrically connected to a PLC, and the PLC is also electrically connected to a display screen; a vent valve (18) is provided on the side wall of the second air outlet pipe (4), the vent valve (18) is electrically connected to the PLC, and the PLC controls the opening and closing of the vent valve (18) to eliminate surge of the fan main unit (1).

2. The multi-host parallel sequential cut-in large flow fan according to claim 1 is characterized in that: The diameter of the second end of the third air outlet pipe (6) is greater than the diameter of the first end of the third air outlet pipe (6), and the diameter of the second end of the third air outlet pipe (6) is equal to the diameter of the fourth air outlet pipe (7).

3. The multi-host parallel sequential cut-in large flow fan according to claim 1 is characterized in that: The motor housing of the fan main unit (1) is provided with a motor cooling air inlet and a motor cooling air outlet (9).

4. The multi-host parallel sequential cut-in large flow fan according to claim 3 is characterized in that: The vent valve (18) is fixedly connected to the fifth air outlet pipe (13).

5. The multi-host parallel sequential cut-in large flow fan according to claim 4 is characterized in that: The motor cooling air outlet (9) is fixedly connected to the fifth air outlet pipe (13).

6. The multi-host parallel sequential cut-in large flow fan according to claim 4 or 5, characterized in that: The fifth air outlet pipe (13) is fixed on the top plate (12) via a flange.

7. The multi-host parallel sequential cut-in large flow fan according to claim 1 is characterized in that: It also comprises a box body (10), wherein a partition (15) is provided inside the box body (10), wherein the partition (15) divides the inside of the box body (10) into a plurality of installation rooms, and the plurality of fan main units (1) are respectively installed in corresponding installation rooms.

8. The multi-host parallel sequential cut-in large flow fan according to claim 7 is characterized in that: One end of the box body (10) is provided with a plurality of air intake windows (11), which respectively correspond to a plurality of installation chambers, and the installation chambers are provided with air intake filters (14) matching the air intake windows (11).

9. The multi-host parallel sequential cut-in large flow fan according to claim 1 is characterized in that: The air outlet of the compression shell (2) is connected to the first air outlet pipe (3) using a stainless steel pipe connector.

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