CN202154632U - A central vacuum system with constant and adjustable negative pressure - Google Patents

Abstract

The utility model relates to a central dust collection system with constant and adjustable negative pressure, which comprises a programmable logic controller, a vacuum pump, a dust collection box body, a pressure sensor, a main dust collection pipeline, a back-blowing pipeline, a branch dust collection pipeline and a pipeline; a filtering filter element is nested at the upper end part of the dust collecting box body, the top surface of the filtering filter element is provided with a mounting hole and an air outlet hole, an air back-blowing pipe is arranged in the filtering filter element, one end of a back-blowing pipeline is connected with the air back-blowing pipe, and the other end of the back-blowing pipeline is provided with a pulse back-blowing control valve; the dust collecting box body is provided with a dust inlet hole; one end of the dust collection branch pipeline is connected with the pipe body of the main dust collection pipeline, and the other end of the dust collection branch pipeline is connected with the dust collection terminal; the vacuum pump is connected with the air outlet of the filter element through a pipeline; a second pressure sensor is arranged in the filter element, a third pressure sensor is arranged in the dust collection box body, and the vacuum pump, the second pressure sensor and the third pressure sensor are respectively and electrically connected with the programmable logic controller. The utility model discloses control blowback gas pipe carries out the dust cleaning to filtering the filter core and handles, extension filter core life.

Description

A central vacuum system with constant and adjustable negative pressure

technical field

The utility model relates to a central dust suction system, in particular to a central dust suction system with constant and adjustable negative pressure.

Background technique

The central vacuum system is formed based on the development of a single vacuum cleaner. When people use the vacuum cleaner to clean the work area, they find that the vacuum cleaner has many advantages such as high working efficiency, cleanness, and no secondary pollution. However, for large-scale work areas , the power of a single vacuum cleaner cannot meet the requirements, and moving the vacuum cleaner back and forth is not only labor-intensive, but also constrained by power cords and suction pipes; There are multiple areas in the workshop that need to be vacuumed and cleaned. When vacuuming and cleaning, just connect the vacuum tool to the vacuum pipe and open the valve to vacuum. However, the work efficiency of such a person cleaning operation is relatively low. Later, people improved the dust suction pipeline, increased the power of the dust suction main engine, and increased the exhaust air volume of the main engine; The workshop can complete the cleaning work in a short period of time.

The central vacuum system is mainly used in dust cleaning, dust recycling, waste cleaning, equipment maintenance, and dust removal operations in commercial and residential quarters, large hotels, etc. in the production workshops of industrial enterprises. The current central vacuum system uses one or more high-power vacuum pumps as the main engine for vacuuming. Wind pressure and air volume; on the surface, it can improve the efficiency of the entire vacuuming operation. In fact, this type of central vacuuming system has many defects: the biggest defect is: the working state of the system cannot be adjusted, and it is often high-power The operation consumes a lot of energy; and the central vacuum system does not monitor the working status of its filter element, so that the cleaning action of the filter element is not timely and inaccurate, resulting in a short service life of the filter element and frequent maintenance of the system , to increase the operating cost of the system.

Contents of the invention

The utility model solves the deficiencies of the prior art, and provides a central vacuum system with constant and adjustable negative pressure. Maximum energy-saving operation, while monitoring the working status of the filter element in real time, and cleaning the filter element in time, which can prolong the service life of the filter element, keep the system working stably, and clean the pipeline through the pipeline dust removal control mode Treatment to reduce the accumulation and spread of bacteria.

The technical scheme adopted by the utility model is: a central dust collection system with constant and adjustable negative pressure, which includes a programmable logic controller, a vacuum pump, a dust collection box, a second pressure sensor, a third pressure sensor, and a dust suction main body. Pipeline, dust suction branch pipe, blowback pipe and pipe; the upper end of the dust collection box is nested with a cylindrical filter element, and the top surface of the filter element is provided with installation holes and air outlet holes, and the accommodation inside the filter element The space is provided with an air blowback pipe, and one end of the backflush pipe passes through the installation hole on the top surface of the filter element to connect with the air intake end of the air blowback pipe, and the other end of the backflush pipe is provided with a pulse blowback control valve; the dust box The body has a dust inlet hole, and the dust inlet hole is connected to the dust outlet end of the main dust suction pipe; one end of the dust suction branch pipe is connected to the pipe body of the dust suction main pipe, and the other end of the dust suction branch pipe is connected to the dust suction terminal; The suction port of the vacuum pump is connected with the air outlet of the filter element through a pipeline; the second pressure sensor is arranged inside the filter element, the third pressure sensor is arranged in the dust collection box, and the vacuum pump, the second pressure sensor and the third pressure sensor are respectively It is electrically connected with the programmable logic controller.

As a preference, a vacuum buffer tank is provided between the vacuum pump and the dust collection box, the vacuum buffer tank is provided with an air inlet and an air outlet, the suction port of the vacuum pump is connected to the air outlet through a pipeline, and the air inlet The air port is connected with the air outlet of the filter element through a pipe; the housing of the vacuum buffer tank is provided with an overpressure mechanical protection device.

As a preference, a pressure protection valve is also provided on the housing of the air inlet vacuum buffer tank, the control unit of the pressure protection valve is electrically connected to the programmable logic controller, a temperature sensor is provided at the air outlet of the vacuum pump, and the temperature sensor is connected to the programmable logic controller. The logic controller is electrically connected.

Preferably, a first pressure sensor is provided inside the vacuum buffer tank, and the first pressure sensor is electrically connected to the programmable logic controller.

Preferably, the vacuum pump is a high-pressure blower.

Preferably, the air blowback pipe is flexibly connected with the blowback pipeline.

Preferably, the overpressure mechanical protection device is a pressure relief valve.

Preferably, the central vacuum system with constant and adjustable negative pressure further includes a frequency converter, the control unit of the vacuum pump is electrically connected to the frequency converter, and the signal input terminal of the frequency converter is electrically connected to the programmable logic controller.

Preferably, the central vacuum system with constant and adjustable negative pressure also includes a display screen and an input device, and the display screen and the input device are both electrically connected to a programmable logic controller.

As a preference, the central vacuum system with constant and adjustable negative pressure also includes a touch screen, and the touch screen is electrically connected with the programmable logic controller.

As a preference, the central vacuum system with constant and adjustable negative pressure also includes a cabinet, a DC power supply, an AC power switch and a fan, a partition is provided in the middle of the cabinet, and the partition divides the cabinet into The upper storage space and the lower storage space. The vacuum buffer tank and the vacuum pump are installed in the lower storage space. The programmable logic controller, frequency converter, DC power supply and AC power switch are installed in the upper storage space. The cabinet A fan installation hole is provided, and the fan is fixed on the solid through the installation hole. A temperature sensor is provided inside the cabinet, and the control unit and the temperature sensor of the fan are electrically connected to the programmable logic controller.

Preferably, the programmable logic controller includes a temperature control module, a pressure control module, a pressure difference control module, a current control module and a pressure protection valve drive module.

Preferably, the other end of the blowback pipeline is provided with a compressed air heating box.

Preferably, a dust cleaning control valve is provided on the dust suction main pipeline.

The relative negative pressure mentioned herein refers to the negative pressure relative to one atmospheric pressure.

The beneficial effects obtained by the utility model are: a central vacuum system with constant and adjustable negative pressure, including a programmable logic controller, a vacuum pump, a dust collection box, a second pressure sensor, a third pressure sensor, and a main dust suction pipeline , dust suction branch pipeline, blowback pipeline and pipeline; the upper end of the dust collection box is nested with a cylindrical filter element, the top surface of the filter element is provided with installation holes and air outlet holes, and the accommodation space inside the filter element is An air back blowing pipe is provided, one end of the back blowing pipe passes through the installation hole on the top surface of the filter element and is connected to the inlet end of the air back blowing pipe, and the other end of the back blowing pipe is provided with a pulse back blowing control valve; the dust collection box There is a dust inlet hole, and the dust inlet hole is connected to the dust outlet end of the main dust suction pipe; one end of the dust suction branch pipe is connected to the pipe body of the dust suction main pipe; the other end of the dust suction branch pipe is connected to the dust suction terminal; the vacuum pump The suction port of the filter element is connected with the outlet hole of the filter element through a pipeline; the second pressure sensor is arranged inside the filter element, the third pressure sensor is arranged in the dust collection box, and the vacuum pump, the second pressure sensor and the third pressure sensor are respectively connected with The programmable logic controller is electrically connected. The utility model can realize real unattended operation, and can automatically shut down when there is no vacuum terminal working, so as to realize the maximum energy-saving operation. At the same time, through a special control method, the air blowback pipe is controlled to clean the filter core, To extend the service life of the filter element, the pipeline can also be cleaned through the pipeline dust removal control mode to reduce the accumulation and spread of bacteria.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

The reference signs are:

1—AC power switch 2—Inverter 3—Temperature sensor

4—Fan 5—Vacuum pump 6—Vacuum buffer tank

7—Filter Element 8—Air Blowback Pipe 9—Dust Collection Box

10—Vacuum suction pipe 11—Dust suction terminal 12—Ash cleaning control valve

13—Main suction pipe 14—Third pressure sensor 15—Second pressure sensor

16—Compressed air heating box 17—Pulse blowback control valve 18—Blowback pipeline

19—Pipeline 20—First pressure sensor 21—Programmable logic controller

22—DC Power Supply 23—Touch Screen 24—Pressure Protection Valve

25—pressure relief valve.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example:

As shown in Figure 1, a central vacuum system with constant and adjustable negative pressure includes a programmable logic controller 21, a vacuum pump 5, a dust collection box 9, a second pressure sensor 15, a third pressure sensor 14, and a dust collection system. Main pipeline 13, dust suction branch pipeline 10 and pipeline 19; a cylindrical filter element 7 is nested in the upper end of the dust collection box 9, and the top surface of the filter element 7 has installation holes and air outlet holes, and the filter element 7 The internal accommodation space is provided with an air blowback pipe 8, and one end of the blowback pipe 18 is connected to the air intake end of the air blowback pipe 8 through the installation hole on the top surface of the filter element 7, and the other end of the blowback pipe 18 is provided with a pulse blowback pipe. Blowing control valve 17; said dust collecting box 9 has a dust inlet hole, and the dust inlet hole is connected with the dust outlet end of the dust suction main pipeline 13; one end of the dust suction branch pipeline 10 is connected with the pipe body of the dust suction main pipeline 13 The other end of the dust suction branch pipeline 10 is connected with the dust suction terminal 11; the suction port of the vacuum pump 5 is connected with the air outlet of the filter element 7 through a pipeline 19; the second pressure sensor 15 is arranged inside the filter element 7, and the The third pressure sensor 14 is arranged in the dust collecting box 9 , and the vacuum pump 5 , the second pressure sensor 15 and the third pressure sensor 14 are respectively electrically connected to the programmable logic controller 21 .

When the system is working, the programmable logic controller 21 controls the vacuum pump 5 to extract air from the dust suction main pipeline 13 and the dust suction branch pipeline 10, so that the air pressure in the dust collection box 9, the dust suction main pipeline 13 and the dust suction branch pipeline 10 Maintain a negative pressure state relative to the atmospheric pressure. When the area where a certain dust collection terminal 11 is located needs to be vacuumed, the terminal is opened to carry out dust collection operations; 13 enters the dust collection box 9 and falls in the dust collection area at the lower end of the dust collection box 9; after light dust enters the dust collection box 9, it may adhere to the surface of the filter element 7, and the filter element 7 It can isolate the light sundries, so that the gas entering the vacuum pump 5 does not contain solid impurities, and protects the stable operation of the vacuum pump 5 .

When the system is working normally, the air enters the dust collection box from the dust collection main pipe 13, then enters the filter element 7, and finally is discharged from the vacuum pump 5; as the system works, more and more light dust adheres to the surface of the filter element 7 , when the light dust is more attached, it will affect the dust collection work of the system. At this time, the dust removal treatment of the filter element 7 is required. The utility model performs the dust removal treatment of the filter element 7 in 5 ways, specifically as follows :

1. Pressure difference controls dust removal; when the system is working normally, the airflow inside the system is smooth, and the pressure difference between the second pressure sensor 15 and the third pressure sensor 14 is kept in a low range, such as less than 3KPa, when working for a period of time Finally, a large amount of dust is attached to the surface of the filter element 7, and the air flow is hindered when it enters the inside of the filter element 7 from the dust collection box 9, so that the pressure difference between the second pressure sensor 15 and the third pressure sensor 14 increases. The pressure difference increases to exceed the set value, such as 8KPa. At this time, the programmable logic controller 21 control system carries out the cleaning process of the filter element 7, and the processing steps are as follows: one end of the back-flushing pipeline 18 that is outside the filter element 7 is connected with the filter element 7. The compressed air box is connected, and the compressed air is controlled to enter the inside of the filter element 7 through the back blowing pipeline 18 at a certain time interval. 7 enters the dust collection box 9, and the compressed air blows back the filter element 7, so that the dust attached to the filter element 7 falls into the dust collection box 9; at the same time, the system is always in working condition, when the second pressure sensor 15 When the pressure difference between the third pressure sensor 14 and the third pressure sensor 14 returns to within the set value, the dust cleaning is stopped, and the pulse blowback control valve 17 at the other end of the blowback pipeline 18 is closed. Extend the service life of the system and improve the quality of the system.

2. Current control dust removal; when the system is working normally, the interior of the filter element 7 or the interior of the dust collection box 9 is in a state of relative negative pressure. Maintain the current of the relative negative pressure vacuum pump 5; after the system works, the system automatically detects the operating current of the vacuum pump 5. If the system runs to the set relative negative pressure value, it detects that the current of the vacuum pump 5 is significantly greater than the set current. If it is more than 0.5A than the set current, then the programmable logic controller 21 controls the cleaning action of the filter element 7 until the current value of the vacuum pump 5 is equal to or close to the set value.

3. Frequency control dust removal; after the system is turned on, when the system is working normally, and the dust collection terminal 11 connected to the dust collection branch pipe 10 is not working, the pressure inside the system drops to a certain value, such as inside the filter element 7 or dust collection The pressure in the box 9 is reduced to a certain relative negative pressure, the vacuum pump 5 stops working, the pressure inside the system slowly rises to a certain value, the vacuum pump 5 starts to work again, the pressure inside the system drops to a certain value, and the vacuum pump 5 Stop again, and repeat like this; when the system is normal, the operating frequency of the vacuum pump 5 is stable and maintained within a certain range. If the system automatically detects that the operating frequency of the vacuum pump 5 obviously exceeds this range, such as exceeding the upper limit of this range by 8Hz, then The programmable logic controller 21 controls the cleaning action of the filter element 7 until the operation frequency of the vacuum pump 5 returns to within this range, or near this range.

4. Regularly control dust removal; no matter what state the filter element 7 is in, the programmable logic controller 21 controls the system to remove dust from the filter element 7 regularly.

5. Work process cleaning; the programmable logic controller 21 control system performs a cleaning operation before each startup or shutdown.

Further, a vacuum buffer tank 6 is provided between the vacuum pump 5 and the dust collection box 9, and the vacuum buffer tank 6 is provided with an air inlet and an air outlet, and the suction port of the vacuum pump 5 is connected to the outlet port through a pipeline 19. The gas port is connected, and the air inlet is connected with the air outlet of the filter element 7 through the pipeline 19; the housing of the vacuum buffer tank 6 is provided with an overpressure mechanical protection device, and the overpressure mechanical protection device is a pressure relief valve 25, which releases The pressure valve 25 is mechanically connected with the vacuum buffer tank 6 .

The vacuum buffer tank 6 is arranged between the vacuum pump 5 and the dust collection box 9, which can play the role of protecting the vacuum pump 5; when the instrument of the system fails, such as: the second pressure sensor 15 and the third pressure sensor 14 fail, the pipeline 19 will In the blocked state, the vacuum pump 5 may be in an overpressure operation state, that is, the pressure value at the suction port of the vacuum pump 5 is very low, so that the load of the vacuum pump 5 is relatively large. At this time, the pressure relief valve 25 is automatically opened, and the air passes through the pressure relief The valve 25 enters the vacuum buffer tank 6 and the vacuum pump 5 to protect the vacuum pump 5 from overpressure and overload operation.

Further, the housing of the air inlet vacuum buffer tank 6 is also provided with a pressure protection valve 24, the control unit of the pressure protection valve 24 is electrically connected to the programmable logic controller 21, and the outlet of the vacuum pump 5 is provided with a temperature sensor 3 , the temperature sensor 3 is electrically connected to the programmable logic controller 21 .

When the pressure relief valve 25 is also in trouble, the amount of gas entering the vacuum pump 5 is insufficient, and the vacuum pump 5 is overloaded. At the same time, the outlet air temperature of the vacuum pump 5 is gradually rising. Control the pressure protection valve 24 to open gradually to increase the air intake; when the pressure protection valve 24 is working, there is also a situation, so that the outlet air temperature continues to rise until it exceeds a certain set value, and the programmable logic controller 21 will control the system to shut down , to indicate the need for inspection and maintenance. At the same time, when the system is just starting to run, the pressure protection valve 24 is first opened, and the vacuum pump 5 is started without load to ensure the smooth operation of the vacuum pump 5 .

Further, a first pressure sensor 20 is provided inside the vacuum buffer tank 6 , and the first pressure sensor 20 is electrically connected to a programmable logic controller 21 .

When the system is working normally, the internal pressure of the vacuum buffer tank 6 needs to be maintained within a certain relative negative pressure range. The first pressure sensor 20 detects the pressure of the vacuum buffer tank 6 in real time, and then transmits it to the programmable logic controller 21. After signal processing, The programmable logic controller 21 controls the operation state of the vacuum pump 5 .

When the first pressure sensor 20 detects that the pressure in the vacuum buffer tank 6 suddenly increases, such as increasing to an atmospheric pressure within 0.5 seconds and maintaining it for more than 500ms, the system judges that the vacuum pump 5 has failed, and the programmable logic controller 21 stops the control system run.

Further, the vacuum pump 5 is a high-pressure blower.

Further, the described central vacuum system with constant and adjustable negative pressure also includes a frequency converter 2, the control unit of the vacuum pump 5 is electrically connected to the frequency converter 2, and the signal input terminal of the frequency converter 2 is connected to the programmable logic controller 21 electrical connections.

By setting the frequency converter 2, the high-pressure fan can be controlled to perform corresponding acceleration and deceleration actions, and the vacuum degree of the system can be precisely controlled, so that the system can always maintain a stable vacuum value.

Further, the central vacuum system with constant and adjustable negative pressure also includes a touch screen 23 , which is electrically connected to the programmable logic controller 21 .

Through the touch screen 23, the changes of various parameters of the system can be observed, as well as the status of the system, such as normal, maintenance alarms, etc.; at the same time, the set parameter values can be modified to make the system work in a better state.

As a modification of this embodiment, the touch screen 23 may be replaced by a display screen and an input device, both of which are electrically connected to the programmable logic controller 21 .

Further, the central vacuum system with a constant and adjustable negative pressure also includes a cabinet, a DC power supply 22, an AC power switch 1 and a fan 4, a partition is provided in the middle of the cabinet, and the partition divides the cabinet The body part is divided into an upper accommodation space and a lower accommodation space. The vacuum buffer tank 6 and the high-pressure fan are installed in the lower accommodation space. The programmable logic controller 21, the frequency converter 2, the DC power supply 22 and the AC power switch 1 are installed In the upper accommodating space, the cabinet body is provided with a fan installation hole, and the fan 4 is fixed on the cabinet body through the fan installation hole, and a temperature sensor 3 is arranged inside the cabinet body, and the control unit of the fan 4 and the temperature sensor 3 are connected with the programmable logic The controller 21 is electrically connected.

The device is integrated in a cabinet for easy management. At the same time, the operation mode of the fan can be controlled by a programmable logic controller inside the cabinet, and then the heat dissipation in the cabinet can be adjusted. In this utility model, three groups of cooling fans are set to control the temperature. Control, when the system is turned on, control one group of fans to run normally, when the operating frequency of the inverter is equal to or less than 28Hz, control the second group of fans to run, increase the air convection in the cabinet, and enhance the heat dissipation effect. When the temperature sensor 3 detects that the temperature in the cabinet is higher than 45 degrees, it controls the operation of the third group of fans. The DC power supply 22 is provided so that the system can still maintain the operation in the emergency state of power failure.

Further, the programmable logic controller 21 includes a temperature control module, a pressure control module, a pressure difference control module, a current control module and a pressure protection valve driving module.

Further, the air blowback pipe 8 is flexibly connected with the blowback pipeline 18 .

At different sites, there are fixed, rotating, and lifting connections between the air blowback pipe 8 and the blowback pipe 18, so as to meet the dust removal requirements of filter elements in different occasions and achieve the purpose of dust removal.

Further, the other end of the blowback pipeline 18 is provided with a compressed air heating box 16 .

When the system is performing back blowing to clean the filter element 7, the compressed air is heated by the compressed air heating box 16, which prevents the dust from being condensed on the filter element 7 when the back blowing compressed air is in contact with the dust due to its low temperature, and the cleaning effect is better. good.

Further, a pipeline dust removal control valve 12 is provided on the dust suction main pipeline.

The pipeline dust removal control valve 12 is generally installed at the end of the dust collection main pipeline 13 away from the dust collection box 9, or at the end of the dust collection main pipeline 13. When the system enters the pipeline dust cleaning program, close other valves of the system and open Pipeline soot removal control valve 12 runs vacuum pump 5 at full speed, if there are a plurality of pipeline dust removal control valves 12, each pipeline dust removal control valve 12 is opened in turn; the system works for a period of time.

Compared with the general central vacuum system, this embodiment has the following obvious features:

1. High degree of automation, can be completely unattended;

2. The pressure is stable and constant, and the setting can be adjusted arbitrarily to meet different needs for dust and material suction occasions;

3. Energy-saving operation, the system automatically accelerates or decelerates steplessly to adjust the operating speed according to the number of vacuum terminals working, and when there is no vacuum terminal working, the system will automatically stop to achieve maximum energy saving, and the system is always Detect the operating current of the vacuum pump to prevent the vacuum pump from overloading;

4. Reduce the number of maintenance, the programmable logic controller automatically controls the cleaning of filter elements and pipelines, the system runs stably, has a long life, and saves costs;

5. There is less accumulation of dust and foreign matter in the pipeline, and it is clean and odorless.

The utility model has been described in detail, and those skilled in the art should understand that the technical solution of the utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the utility model.

Claims (10)

1. one kind has the central dust collecting system of constant scalable negative pressure, and it is characterized in that: it comprises programmable logic controller (PLC), vavuum pump, dust box, second pressure sensor, the 3rd pressure sensor, dust suction trunk line, dust suction branch pipe(tube), blowback pipeline and pipeline; The filter core of the nested cartridge type in the upper end of said dust box; The end face of filter core has installing hole and venthole; The inner accommodation space of filter core is provided with the air anti-blowpipe; The installing hole that one end of blowback pipeline passes the filter core end face is connected with the inlet end of air anti-blowpipe, and the other end of blowback pipeline is provided with the pulse backblowing control valve; Said dust box has into dirt hole, enters the dirt hole and is connected with the dirt end that goes out of dust suction trunk line; One end of dust suction branch pipe(tube) is connected with the pipe shaft of dust suction trunk line, and the other end of dust suction branch pipe(tube) is connected with the dust suction terminal; The suction port of vavuum pump is connected with the venthole of filter core through pipeline; Said second pressure sensor is arranged on filter core inside, and the 3rd pressure sensor is arranged in the dust box, and vavuum pump, second pressure sensor and the 3rd pressure sensor are electrically connected with programmable logic controller (PLC) respectively.

2. a kind of central dust collecting system of constant scalable negative pressure that has according to claim 1; It is characterized in that: be provided with vacuum buffer tank between said vavuum pump and the dust box; Said vacuum buffer tank is provided with air inlet and gas outlet; The suction port of vavuum pump is connected with said gas outlet through pipeline, and said air inlet is connected with the venthole of filter core through pipeline; The housing of said vacuum buffer tank is provided with the superpressure Machine guarding.

3. a kind of central dust collecting system of constant scalable negative pressure that has according to claim 2; It is characterized in that: also be provided with pressure protection valve on the said air intake vacuum buffer tank shell; The control module of pressure protection valve is electrically connected with programmable logic controller (PLC); The wind outlet of vavuum pump is provided with temperature sensor, and temperature sensor is electrically connected with programmable logic controller (PLC).

4. according to claim 2 or 3 described a kind of central dust collecting systems of constant scalable negative pressure that have, it is characterized in that: the set inside of vacuum buffer tank has first pressure sensor, and first pressure sensor is electrically connected with programmable logic controller (PLC).

5. a kind of central dust collecting system of constant scalable negative pressure that has according to claim 2, it is characterized in that: said vavuum pump is a high pressure positive blower, and blowback tracheae and blowback pipeline flexibly connect, and the superpressure Machine guarding is a pressure relieving valve.

6. a kind of central dust collecting system of constant scalable negative pressure that has according to claim 2; It is characterized in that: described a kind of central dust collecting system of constant scalable negative pressure that has; Also comprise frequency converter; The control module of vavuum pump is electrically connected with frequency converter, and the signal input part of frequency converter is electrically connected with programmable logic controller (PLC).

7. according to claim 1 or 2 or 3 or 5 or 6 described a kind of central dust collecting systems of constant scalable negative pressure that have, it is characterized in that: the other end of blowback pipeline is provided with the compressed air heating cabinet; The dust suction trunk line is provided with pipeline deashing control valve.

8. a kind of central dust collecting system of constant scalable negative pressure that has according to claim 7 is characterized in that: said a kind of central dust collecting system of constant scalable negative pressure that has, also comprise a touch-screen, and touch-screen is electrically connected with programmable logic controller (PLC).

9. a kind of central dust collecting system of constant scalable negative pressure that has according to claim 6; It is characterized in that: said a kind of central dust collecting system of constant scalable negative pressure that has; Also comprise a cabinet, DC power supply unit, AC power supplies switch and fan, the cabinet middle part is provided with dividing plate, and dividing plate is divided into accommodation space and following accommodation space with cabinet inside; Vacuum buffer tank, vavuum pump are installed on down in the accommodation space; Programmable logic controller (PLC), frequency converter, DC power supply unit and AC power supplies switch are installed in the accommodation space, and cabinet is provided with the fan installing hole, and fan is fixed on the solid through installing hole; Cabinet inside is provided with temperature sensor, and the control module of fan and temperature sensor all are electrically connected with programmable logic controller (PLC).

10. a kind of central dust collecting system of constant scalable negative pressure that has according to claim 1, it is characterized in that: programmable logic controller (PLC) comprises temperature control modules, pressure control module, pressure reduction control module, current control module and pressure protection valve driver module.

Images