Paper pulp negative pressure buffering water return system

Abstract

The utility model relates to a paper pulp negative pressure buffering water return system which comprises a gas-liquid separation tank, and a pulp barrel on paper pulp manufacturing equipment is communicated with the gas-liquid separation tank. The vacuum pump is used for controlling negative pressure fluctuation in the buffer tank, the gas-liquid separation tank is communicated with the buffer tank, the buffer tank is communicated with the vacuum pump, and the vacuum pump is electrically connected with the control module; the control module controls the vacuum pump to work according to the negative pressure fluctuation of the gas-liquid separation tank so as to keep the negative pressure of the gas-liquid separation tank stable through the negative pressure fluctuation of the buffer tank. The water return system stabilizes negative pressure fluctuation generated during water drainage of the gas-liquid separation tank, and then internal pressure is kept stable.

Description

Technical Field

[0001] The utility model relates to a paper pulp water return system, in particular to a paper pulp negative pressure buffer water return system. Background Art

[0002] Pulp is the raw material for making products such as paper trays. Existing paper tray production equipment separates the slurry from the water in the pulp during the production process. In order to rationally recycle and utilize the water, it is often necessary to recycle and reuse the water through a return water system. The gas-liquid separation tank used to collect water in the return water system is generally closed. The existing gas-liquid separation tank will affect the vacuum degree when draining, thereby affecting the drainage effect.

[0003] Therefore, the existing return water system needs to be further improved. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and to provide a pulp negative pressure buffer return system, which stabilizes the negative pressure fluctuations generated when the gas-liquid separation tank is drained, thereby maintaining internal pressure stability.

[0005] The purpose of this utility model is achieved in this way:

[0006] A pulp negative pressure buffer return water system includes a gas-liquid separation tank, a pulp barrel on a pulp making device is connected to the gas-liquid separation tank; it also includes a buffer tank and a vacuum pump for controlling negative pressure fluctuations in the buffer tank, the gas-liquid separation tank is connected to the buffer tank, the buffer tank is connected to the vacuum pump, and the vacuum pump is electrically connected to a control module; the control module controls the operation of the vacuum pump according to the negative pressure fluctuations of the gas-liquid separation tank, so as to maintain the negative pressure of the gas-liquid separation tank stable through the negative pressure fluctuations of the buffer tank.

[0007] As a specific solution, the gas-liquid separation tank is connected to a first drainage waterway, and an electric-controlled drainage valve for controlling the on-off of the waterway is provided on the first drainage waterway, and the electric-controlled drainage valve is electrically connected to the control module.

[0008] As another specific solution, the gas-liquid separation tank is provided with a first water level sensor for detecting the lowest water level and a second water level sensor for detecting the highest water level. The first water level sensor and the second water level sensor are electrically connected to the control module respectively, and feed back detection signals to the control module; when the first water level sensor detects the lowest water level, the electronically controlled drain valve is closed; when the second water level sensor detects the highest water level, the electronically controlled drain valve is opened to drain.

[0009] As another specific solution, a first pressure sensor for detecting the pressure inside the tank is provided on the gas-liquid separation tank. The first pressure sensor is electrically connected to the control module and feeds back a detection signal to the control module. When the pressure value detected by the first pressure sensor reaches a first set value, the vacuum pump stops working; when the pressure value detected by the first pressure sensor reaches a second set value, the vacuum pump starts working.

[0010] As another specific solution, the buffer tank is connected to a second drainage waterway, and a manual drainage valve for controlling the on-off of the waterway is provided on the second drainage waterway.

[0011] As another specific solution, the buffer tank is provided with a second pressure sensor for detecting the pressure inside the tank. The second pressure sensor is electrically connected to the control module and feeds back a detection signal to the control module. When the pressure value detected by the second pressure sensor reaches a first set value, the vacuum pump stops working; when the pressure value detected by the second pressure sensor reaches a second set value, the vacuum pump starts working.

[0012] As another specific solution, the slurry barrel is connected to the gas-liquid separation tank through a pumping pipe, one end of the pumping pipe extends into the inner cavity of the slurry barrel and extends to near the bottom of the inner cavity, and the other end of the pumping pipe extends into the gas-liquid separation tank.

[0013] As another specific scheme, the gas-liquid separation tank is connected to the buffer tank through a first exhaust pipe, one end of the first exhaust pipe extends into the gas-liquid separation tank, and the other end of the first exhaust pipe extends into the buffer tank; the buffer tank is connected to the vacuum pump through a second exhaust pipe, one end of the second exhaust pipe extends into the buffer tank, and the other end of the second exhaust pipe is connected to the air inlet end of the vacuum pump.

[0014] As another specific solution, the inner cavity of the buffer tank is vacuum treated.

[0015] The beneficial effects of the utility model are as follows:

[0016] The gas-liquid separator tank is connected to the buffer tank and vacuum pump in sequence. When the vacuum pump is operating, negative pressure is generated in the buffer tank and the gas-liquid separator tank respectively. The pulp and water are separated through the forming mold in the pulp making equipment. The water is then pumped into the gas-liquid separator tank to further separate the residual pulp in the water. When the gas-liquid separator tank is drained, the negative pressure in the gas-liquid separator tank fluctuates. At this time, the vacuum pump supplements the negative pressure in the buffer tank, and the buffer tank further supplements the negative pressure in the gas-liquid separator tank, keeping the return water system stable. It can be seen that this return water system can stabilize the negative pressure fluctuations generated when the gas-liquid separator tank is drained, thereby maintaining a stable internal pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] See also Figure 1 The pulp negative pressure buffer return water system involved in this embodiment includes a gas-liquid separation tank 3, a buffer tank 6, and a vacuum pump 14 for controlling the negative pressure fluctuation in the buffer tank 6; the pulp barrel 1 on the pulp making equipment A is connected to the gas-liquid separation tank 3, the gas-liquid separation tank 3 is connected to the buffer tank 6, the buffer tank 6 is connected to the vacuum pump 14, and the vacuum pump 14 is electrically connected to the control module 7; the control module 7 controls the operation of the vacuum pump 14 according to the negative pressure fluctuation of the gas-liquid separation tank 3, so as to keep the negative pressure of the gas-liquid separation tank 3 stable through the negative pressure fluctuation of the buffer tank 6.

[0020] The gas-liquid separator tank 3 is connected in sequence to the buffer tank 6 and the vacuum pump 14. When the vacuum pump 14 is operating, negative pressure is generated in the internal cavities of the buffer tank 6 and the gas-liquid separator tank 3, respectively. The slurry and water are separated through the forming mold in the pulp making equipment A. The water is then drawn into the gas-liquid separator tank 3 to further separate the residual slurry from the water. When the gas-liquid separator tank 3 is drained, the negative pressure in the internal cavity of the gas-liquid separator tank 3 fluctuates. At this time, the vacuum pump 14 supplements the negative pressure in the buffer tank 6, and the buffer tank 6 further supplements the negative pressure in the gas-liquid separator tank 3, maintaining a stable return water system. This shows that the present return water system can stabilize the negative pressure fluctuations generated when the gas-liquid separator tank 3 is drained, thereby maintaining a stable internal pressure.

[0021] Furthermore, a first drainage waterway is connected to the bottom of the gas-liquid separation tank 3, and an electric-controlled drain valve 2 is provided on the first drainage waterway for controlling the on-off of the waterway. The electric-controlled drain valve 2 is electrically connected to the control module 7, and the control module controls the operation of the electric-controlled drain valve 2, thereby controlling the drainage of the gas-liquid separation tank 3.

[0022] Furthermore, the gas-liquid separation tank 3 is provided with a first water level sensor 4 for detecting the lowest water level, and a second water level sensor 10 for detecting the highest water level. The first water level sensor 4 and the second water level sensor 10 are respectively electrically connected to the control module 7 and provide feedback of detection signals to the control module 7. When the first water level sensor 4 detects the lowest water level, the control module 7 controls the electronically controlled drain valve 2 to close; when the second water level sensor 10 detects the highest water level, the control module 7 controls the electronically controlled drain valve 2 to open for drainage. In this embodiment, a connecting pipe is provided on the outer wall of the gas-liquid separation tank 3. Due to the principle of connecting pipes, the water level in the connecting pipe is consistent with the water level in the inner cavity of the gas-liquid separation tank 3. The first water level sensor 4 and the second water level sensor 10 are respectively installed on the connecting pipe.

[0023] Furthermore, a first pressure sensor 9 for detecting the pressure inside the tank is provided on the gas-liquid separation tank 3. The first pressure sensor 9 is electrically connected to the control module 7 and feeds back a detection signal to the control module 7. When the pressure value detected by the first pressure sensor 9 reaches a first set value, the vacuum pump 14 stops working. When the pressure value detected by the first pressure sensor 9 reaches a second set value, the vacuum pump 14 starts working. The first set value and the second set value can be set according to actual needs.

[0024] Furthermore, the bottom of the buffer tank 6 is connected to a second drainage waterway, and a manual drain valve 5 is provided on the second drainage waterway for controlling the on-off of the waterway; during the water pumping process, some liquid may enter the buffer tank 6. In order to ensure the normal operation of the buffer tank 6, it is necessary to drain the water through the manual drain valve 5; of course, in addition to the manual drain valve 5, drainage can also be carried out through an electric drain valve, which is electrically connected to the control module and the operation is controlled by the control module.

[0025] Furthermore, the buffer tank 6 is provided with a second pressure sensor 12 for detecting the pressure inside the tank. The second pressure sensor 12 is electrically connected to the control module 7 and feeds back a detection signal to the control module 7. When the pressure value detected by the second pressure sensor 12 reaches a first set value, the vacuum pump 14 stops working; when the pressure value detected by the second pressure sensor 12 reaches a second set value, the vacuum pump 14 starts working.

[0026] Furthermore, the slurry barrel 1 is connected to the gas-liquid separation tank 3 through a pumping pipe 8 , one end of the pumping pipe 8 extends into the inner cavity of the slurry barrel 1 and extends to near the bottom of the inner cavity, and the other end of the pumping pipe 8 extends into the gas-liquid separation tank 3 .

[0027] Furthermore, the gas-liquid separation tank 3 is connected to the buffer tank 6 through a first exhaust pipe 11, one end of the first exhaust pipe 11 extends into the gas-liquid separation tank 3, and the other end of the first exhaust pipe 11 extends into the buffer tank 6; the buffer tank 6 is connected to the vacuum pump 14 through a second exhaust pipe 13, one end of the second exhaust pipe 13 extends into the buffer tank 6, and the other end of the second exhaust pipe 13 is connected to the air inlet end of the vacuum pump 14.

[0028] Furthermore, the inner cavity of the buffer tank 6 is vacuum treated.

[0029] The above is a preferred embodiment of the present invention, which illustrates and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A paper pulp negative pressure buffer return water system, comprising a gas-liquid separation tank (3), wherein a pulp barrel (1) on a paper pulp making device (A) is connected to the gas-liquid separation tank (3); characterized in that: The invention also includes a buffer tank (6) and a vacuum pump (14) for controlling the negative pressure fluctuation in the buffer tank (6); the gas-liquid separation tank (3) is connected to the buffer tank (6), the buffer tank (6) is connected to the vacuum pump (14), and the vacuum pump (14) is electrically connected to the control module (7); the control module (7) controls the operation of the vacuum pump (14) according to the negative pressure fluctuation of the gas-liquid separation tank (3), so as to maintain the negative pressure of the gas-liquid separation tank (3) stable through the negative pressure fluctuation of the buffer tank (6).

2. The pulp negative pressure buffering return water system according to claim 1, characterized in that: The gas-liquid separation tank (3) is connected to a first drainage waterway, and an electric-controlled drainage valve (2) for controlling the on-off of the waterway is provided on the first drainage waterway. The electric-controlled drainage valve (2) is electrically connected to the control module (7).

3. The pulp negative pressure buffering return water system according to claim 2, characterized in that: The gas-liquid separation tank (3) is provided with a first water level sensor (4) for detecting the lowest water level and a second water level sensor (10) for detecting the highest water level. The first water level sensor (4) and the second water level sensor (10) are electrically connected to the control module (7) respectively and feed back detection signals to the control module (7). When the first water level sensor (4) detects the lowest water level, the electrically controlled drain valve (2) is closed; when the second water level sensor (10) detects the highest water level, the electrically controlled drain valve (2) is opened for drainage.

4. The pulp negative pressure buffering water return system according to claim 1, characterized in that: A first pressure sensor (9) for detecting the pressure inside the gas-liquid separation tank (3) is provided. The first pressure sensor (9) is electrically connected to the control module (7) and feeds back a detection signal to the control module (7). When the pressure value detected by the first pressure sensor (9) reaches a first set value, the vacuum pump (14) stops working; when the pressure value detected by the first pressure sensor (9) reaches a second set value, the vacuum pump (14) starts working.

5. The pulp negative pressure buffering return water system according to claim 1, characterized in that: The buffer tank (6) is connected to a second drainage waterway, and a manual drainage valve (5) is provided on the second drainage waterway for controlling the on-off of the waterway.

6. The pulp negative pressure buffering return water system according to claim 1, characterized in that: The buffer tank (6) is provided with a second pressure sensor (12) for detecting the pressure inside the tank. The second pressure sensor (12) is electrically connected to the control module (7) and feeds back a detection signal to the control module (7). When the pressure value detected by the second pressure sensor (12) reaches a first set value, the vacuum pump (14) stops working; when the pressure value detected by the second pressure sensor (12) reaches a second set value, the vacuum pump (14) starts working.

7. The pulp negative pressure buffering return water system according to claim 1, characterized in that: The slurry barrel (1) is connected to the gas-liquid separation tank (3) through a pumping pipe (8), one end of the pumping pipe (8) extends into the inner cavity of the slurry barrel (1) and extends to near the bottom of the inner cavity, and the other end of the pumping pipe (8) extends into the gas-liquid separation tank (3).

8. The pulp negative pressure buffering water return system according to claim 1, characterized in that: The gas-liquid separation tank (3) is connected to the buffer tank (6) via a first exhaust pipe (11), one end of the first exhaust pipe (11) extends into the gas-liquid separation tank (3), and the other end of the first exhaust pipe (11) extends into the buffer tank (6); the buffer tank (6) is connected to the vacuum pump (14) via a second exhaust pipe (13), one end of the second exhaust pipe (13) extends into the buffer tank (6), and the other end of the second exhaust pipe (13) is connected to the air inlet end of the vacuum pump (14).

9. The pulp negative pressure buffering water return system according to any one of claims 1 to 8, characterized in that: Vacuum treatment of the inner cavity of the buffer tank.

Images