A siphon type unpowered decanting device and control method

Abstract

The present invention discloses a siphon type unpowered decanting device and control method, including an electric control system and a water collecting device arranged inside a treatment unit pool body, wherein the lower end of the water collecting device is connected to a jet device through a drainage device, and the upper end of the water collecting device is connected to a siphon destroying device, the water collecting device includes an inner cylinder, the lower end of the inner cylinder is connected to a drainage pipe through a drainage connecting device, a liquid level monitoring device is arranged inside the treatment unit pool body, an outer cylinder is sleeved on the outer side of the inner cylinder, the lower end of the outer cylinder is placed below the lowest liquid level of drainage control, an exhaust port is arranged at the upper end of the outer cylinder, and the exhaust port is connected to an exhaust solenoid valve through a vent pipe passing through an inspection port above the treatment unit pool body. By adjusting the high and low liquid level setting values, the drainage volume is controlled according to the drainage start liquid level and stop liquid level, and the automatic control of the time-series drainage is realized through program control. The water collecting device can isolate the floating scum, floating oil and other debris in the upper clear liquid through the setting of the outer cylinder to ensure the water quality of the outlet water.

Description

Technical Field

[0001] The invention relates to the technical field of sewage discharge treatment, and in particular to a siphon type unpowered decanting device and a control method thereof. Background Art

[0002] In sewage treatment processes, devices for discharging the supernatant of treatment units are often used. For continuously operated processes, a fixed outlet weir is usually used. For batch-type treatment processes such as SBR and CASS, a variable liquid level supernatant discharge device is required. When discharge is required, the clean water on the upper layer of the treatment unit enters the clean liquid discharge device for collection and is discharged through a pipe or a drainage pump. Among the commonly used discharge devices, the decanter is the most widely used.

[0003] The structural characteristics of the decanter result in certain restrictions on its application environment. The driving mechanism of the decanter needs to be installed on the top of the pool wall. The motor and connecting rod drive the water collection tank in the pool to adjust the height according to the control requirements. When the water weir of the water collection tank is lower than the liquid level, the upper clear liquid can flow into the water collection tank for drainage. When the water weir of the water collection tank is higher than the liquid level, the upper clear liquid cannot flow into the water collection tank and the drainage stops. For some similar processes, but the pool structure does not have the ability to install a decanter, such as when the pool body is an underground structure, the pool top is too high from the liquid level, and the pool body size cannot meet the installation space of the decanter, there are certain problems with variable liquid level drainage, which has caused certain obstacles to the application of this process. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a siphon-type unpowered decanting device and a control method to realize variable liquid level drainage of the processing unit, which can isolate floating scum, floating oil and other debris in the upper clear liquid, realize timed drainage through program control, realize automatic control, and realize the function of the entire processing process.

[0005] A siphon type unpowered decanting device comprises an electric control system and a water collecting device arranged inside a treatment unit pool body, wherein the lower end of the water collecting device is connected to a jet device through a drainage device, and the upper end of the water collecting device is connected to a siphon destroying device, and the water collecting device comprises an inner cylinder, the lower end of the inner cylinder is connected to a drainage pipe through a drainage connecting device, a liquid level monitoring device is arranged inside the treatment unit pool body, an outer cylinder is sleeved on the outer side of the inner cylinder, the lower end of the outer cylinder is placed below the minimum liquid level of drainage control, an exhaust port is arranged at the upper end of the outer cylinder, the exhaust port is connected to an exhaust solenoid valve through a vent pipe passing through an inspection port above the treatment unit pool body, and the other end of the exhaust solenoid valve is connected to the jet device.

[0006] Furthermore, the drainage device includes a drainage pump, one end of which is connected to the drainage pipe through a first manual valve, and the other end is connected to the outlet pipe through a check valve and a second manual valve in sequence, the outlet pipe is connected to the jet device, and the free end of the jet device is connected to the drain outlet.

[0007] Furthermore, the free end of the siphon destroying device is connected to the air inlet, and the other end is connected to the ventilation pipe.

[0008] Furthermore, the drainage connection device includes a drainage connection pipe connected to the lower end of the inner tube, and the other end of the drainage connection pipe is provided with a connection flange, and the connection flange is connected to the drainage pipe.

[0009] Furthermore, the inner cylinder and the outer cylinder are arranged inside the processing unit cell body through a fixing bracket.

[0010] Furthermore, the siphon destroying device is a siphon destroying air intake solenoid valve.

[0011] Furthermore, the liquid level monitoring device is a liquid level meter.

[0012] Furthermore, the jet device is an ejector, a negative pressure suction port is provided at the upper end of the ejector, and the negative pressure suction port is connected to the exhaust port through an exhaust solenoid valve.

[0013] Furthermore, the electric control system controls the water collection device, the jet device, the drainage device, the siphon destruction device, and the liquid level monitoring device through a PLC program.

[0014] The present invention also discloses a control method for a siphon type unpowered decanting device, which is applied to the above-mentioned siphon type unpowered decanting device and is characterized in that it comprises the following steps:

[0015] S1. The electronic control system performs self-inspection on the device and starts after passing the self-inspection;

[0016] S2, the liquid level monitoring device detects the liquid level of the tank body and provides a liquid level signal to the electronic control system;

[0017] S3, the electronic control system controls the drainage pump according to the liquid level signal obtained in S2, and the drainage pump starts when the set high liquid level is reached;

[0018] S4. After the drainage pump is started, the jet device generates a suction effect to discharge the air in the water collection device, so that negative pressure is formed in the water collection device to achieve drainage;

[0019] S5. When the water is drained to the set low liquid level, the drainage pump stops, the siphon destruction system starts, and air enters the top of the water collection device to destroy the siphon and block the drainage, and the cycle S2-S5 is repeated.

[0020] The beneficial effects of the present invention are:

[0021] The water collecting device of a siphon type unpowered decanting device of the present invention is a fixed structure, does not need to be driven by a driving device and can achieve drainage with the change of liquid level, thereby realizing variable liquid level drainage of the processing unit; the starting liquid level and stopping liquid level of drainage can be realized by adjusting the set values ​​of high and low liquid levels, thereby realizing the control of drainage volume; drainage can also be completed by setting the drainage time, thereby making the control and operation more flexible; through program control, timed drainage can be realized, automatic control can be realized, and the entire processing process function can be realized; the water collecting device can isolate scum, floating oil and other debris in the upper clear liquid through the setting of the outer cylinder, thereby ensuring that the drainage does not carry the upper scum, floating oil and other substances, thereby ensuring the water quality of the effluent; it can not only replace the decanter for drainage of treatment processes such as SBR and CASS in batch operation, but also can be used for drainage of the supernatant of process units such as intermittently operated oil separators, sedimentation tanks, regulating tanks, biochemical tanks, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a siphon type unpowered decanting device;

[0023] Figure 2 It is a schematic diagram of a siphon type unpowered decanting device reaching a high liquid level state;

[0024] Figure 3 It is a schematic diagram of a siphon type unpowered decanting device reaching a medium liquid level state;

[0025] Figure 4 It is a schematic diagram of a siphon type unpowered decanting device reaching a low liquid level state;

[0026] Figure 5 It is a schematic diagram of a siphon type unpowered decanting device when the liquid level starts to rise after reaching a low level;

[0027] Figure 6 The present invention is a flow chart of a control method of a siphon type unpowered decanting device.

[0028] Among them, 1. jet device; 2. siphon breaking device; 3. inner tube; 4. outer tube; 5. drainage connecting pipe; 6. connecting flange; 7. liquid level monitoring device; 8. exhaust port; 9. vent pipe; 10. exhaust solenoid valve; 11. drainage pump; 12. drainage pipe; 13. first manual valve; 14. check valve; 15. second manual valve; 16. water outlet pipe; 17. treatment unit pool body; 18. inspection port; 19. fixed bracket. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-6 The preferred embodiments of the present invention are described in detail so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0030] A siphon type unpowered decanting device comprises an electric control system and a water collecting device arranged inside a treatment unit pool body 17, wherein the lower end of the water collecting device is connected to a jet device 1 through a drainage device, and the upper end of the water collecting device is connected to a siphon destroying device 2, the water collecting device comprises an inner cylinder 3, the lower end of the inner cylinder 3 is connected to a drainage pipe 12 through a drainage connecting device, a liquid level monitoring device 7 is arranged inside the treatment unit pool body 17, an outer cylinder 4 is sleeved on the outer side of the inner cylinder 3, the lower end of the outer cylinder 4 is placed below the minimum liquid level of drainage control, an exhaust port 8 is arranged at the upper end of the outer cylinder 4, the exhaust port 8 is connected to an exhaust solenoid valve 10 through a vent pipe 9 passing through an inspection port 18 above the treatment unit pool body 17, and the other end of the exhaust solenoid valve 10 is connected to the jet device 1. The drainage device includes a drainage pump 11, one end of which is connected to a drainage pipe 12 through a first manual valve 13, and the other end is connected to a water outlet pipe 16 through a check valve 14 and a second manual valve 15 in sequence, and the water outlet pipe 16 is connected to the jet device 1, and the free end of the jet device 1 is connected to the drain port. The free end of the siphon destruction device 2 is connected to the air inlet, and the other end is connected to the vent pipe 9. The drainage connection device includes a drainage connection pipe 5 connected to the lower end of the inner tube 3, and the other end of the drainage connection pipe 5 is provided with a connection flange 6, and the connection flange 6 is connected to the drainage pipe 12. The inner tube 3 and the outer tube 4 are arranged inside the treatment unit pool body 17 through a fixed bracket 19. The siphon destruction device 2 is a siphon destruction air inlet electromagnetic valve. The liquid level monitoring device 7 is a liquid level gauge. The jet device 1 is an ejector, and a negative pressure suction port is opened at the upper end of the ejector, and the negative pressure suction port is connected to the exhaust port 8 through an exhaust electromagnetic valve 10. The electric control system controls the water collecting device, the jet device 1, the drainage device, the siphon destroying device 2, and the liquid level monitoring device 7 through the PLC program.

[0031] The present invention also provides a control method for a siphon type unpowered decanting device, which is applied to the above-mentioned siphon type unpowered decanting device and is characterized in that it comprises the following steps:

[0032] S1. The electronic control system performs self-inspection on the device and starts after passing the self-inspection;

[0033] S2, the liquid level monitoring device detects the liquid level of the tank body and provides a liquid level signal to the electronic control system;

[0034] S3, the electronic control system controls the drainage pump according to the liquid level signal obtained in S2, and the drainage pump starts when the set high liquid level is reached;

[0035] S4. After the drainage pump is started, the jet device generates a suction effect to discharge the air in the water collection device, so that negative pressure is formed in the water collection device to achieve drainage;

[0036] S5. When the water is drained to the set low liquid level, the drainage pump stops, the siphon destruction system starts, and air enters the top of the water collection device to destroy the siphon and block the drainage, and the cycle S2-S5 is repeated.

[0037] The water collecting device is a fixed structure and does not require a driving device to drive it but can achieve drainage as the liquid level changes. When the water collecting device is exhausted and vacuumized, under the action of atmospheric pressure, the upper clear liquid in the treatment unit pool body 17 enters the water collecting device, that is, between the outer cylinder 4 and the inner cylinder 3, and is discharged to a position below the liquid level through the drainage pipe 12 and discharged through the drainage pump 11, thereby achieving siphoning and drainage effects.

[0038] An ejector is installed on the outlet pipe 16 of the drainage pump 11. A negative pressure suction port is opened at the throat position of the ejector. The suction port is connected to the exhaust port 8 at the top of the water collection device through the vent pipe 9. After the drainage pump 11 is started, the ejector generates a suction effect to discharge the air in the water collection device, so that negative pressure is formed in the water collection device to achieve drainage.

[0039] The drainage process consists of a water collection device, an ejector, a drainage pump 11, a siphon breaking system, a liquid level meter, and an electronic control system. The liquid level monitoring device 7, i.e., the liquid level meter, detects the high and low liquid levels, provides a liquid level signal to the electronic control system, and controls the start and stop of the drainage pump 11 through the PLC program to achieve drainage and stop drainage operations; when the liquid level reaches the set low liquid level, the drainage pump 11 stops, the siphon breaking system, i.e., the siphon breaking air intake solenoid valve starts, and air enters the top of the water collection device to break the siphon, block drainage, and end the drainage cycle. The starting and stopping liquid levels of drainage can be achieved by adjusting the set values ​​of the high and low liquid levels, and the drainage volume can be controlled. The drainage can also be completed by setting the drainage time, and the control and operation are more flexible.

[0040] The water collecting device includes an inner cylinder 3, an outer cylinder 4, and an exhaust port 8. The inner cylinder 3 is the main component for setting the drainage liquid level difference and is a drainage channel, and the lower part is connected by a drainage connecting pipe 5; the outer cylinder 4 is an isolation cover, the lower part of which is submerged below the liquid surface, and the inner cylinder 3 realizes an internal closed space. At the same time, the outer cylinder 4 can isolate impurities such as scum and floating oil on the liquid surface to ensure the water quality of the outlet water.

[0041] The electronic control system is controlled by PLC programming and combined with various functional units to achieve automatic control operation; each operation cycle consists of: when the high liquid level is reached, the drainage pump 11 starts - the exhaust solenoid valve 10 opens, exhaust - the exhaust solenoid valve 10 closes, drainage operation - when the low liquid level is reached, the drainage pump 11 stops - the siphon is destroyed, the intake solenoid valve opens, the intake destroys the siphon - the drainage cycle ends.

[0042] Specifically, Figure 2As shown, just before the treatment unit pool body 17 reaches the high liquid level (starting drainage liquid level), the drainage pump 11 is in a stopped state, the exhaust solenoid valve 10 and the siphon destruction air intake solenoid valve are both in a closed state, and the liquid level meter gives a signal; then, the drainage state is started, at which time the drainage pump 11 is started, the exhaust solenoid valve 10 is opened first, and then closed after 10 seconds (the duration can be adjusted according to the situation), and drainage is carried out, and the siphon destruction air intake solenoid valve is in a closed state; when the drainage reaches the middle liquid level, as shown in FIG. Figure 3 As shown, the drainage pump 11 is in the starting state, the exhaust solenoid valve 10 and the siphon destruction intake solenoid valve are both in the closed state, and when the drainage just reaches the low liquid level (stop drainage liquid level), the liquid level meter gives a signal, such as Figure 4 As shown, at this time, the drainage pump 11 stops running, the exhaust solenoid valve 10 and the siphon destruction air intake solenoid valve are both in a closed state, then the drainage pump 11 stops running, the exhaust solenoid valve 10 is in a closed state, the siphon destruction air intake solenoid valve is opened first, and then closed after 10 seconds (the duration can be adjusted according to the situation), the drainage is completed, and the water level begins to rise after the drainage reaches the low liquid level, as shown in FIG. Figure 5 As shown, the drainage pump 11 is in a stopped state, and the exhaust solenoid valve 10 and the siphon-breaking intake solenoid valve are both in a closed state.

[0043] Any example of the present invention can be used as an independent technical solution or combined with other examples. All patents and publications mentioned in the specification of the present invention indicate that these are public technologies in the field and can be used in the present invention. All patents and publications cited here are also listed in the references, just like each publication is specifically cited separately. The present invention here can be implemented in the absence of any element or elements, one limitation or multiple limitations, and this limitation is not specifically stated here. The terms and expressions used here are descriptive methods, but not limited by them. There is no intention to indicate that these terms and explanations described in this book exclude any equivalent features, but it can be known that any appropriate changes or modifications can be made within the scope of the present invention and the claims. It can be understood that the embodiments described in the present invention are embodiments and features in some embodiments, and any person skilled in the art can make some changes and variations based on the essence of the present invention, and these changes and variations are also considered to belong to the scope of the present invention and the scope limited by the independent claims and the appended claims.

Claims

1. A siphon type unpowered decanting device, characterized in that: The invention comprises an electric control system and a water collecting device arranged inside a treatment unit pool body (17), wherein the lower end of the water collecting device is connected to a jet device (1) via a drainage device, and the upper end of the water collecting device is connected to a siphon destroying device (2), wherein the water collecting device comprises an inner cylinder (3), wherein the lower end of the inner cylinder (3) is connected to a drainage pipe (12) via a drainage connection device, wherein a liquid level monitoring device (7) is arranged inside the treatment unit pool body (17), wherein an outer cylinder (4) is sleeved on the outer side of the inner cylinder (3), wherein the lower end of the outer cylinder (4) is placed below the lowest liquid level of drainage control, and an exhaust port (8) is arranged at the upper end of the outer cylinder (4), wherein the exhaust port (8) is connected to an exhaust solenoid valve (10) via a vent pipe (9) passing through an inspection port (18) above the treatment unit pool body (17), and the other end of the exhaust solenoid valve (10) is connected to the exhaust solenoid valve (10). The end of the drain device (1) is connected to the drain pipe (12) through a first manual valve (13), and the other end of the drain pump (11) is connected to a water outlet pipe (16) through a check valve (14) and a second manual valve (15) in sequence. The water outlet pipe (16) is connected to the drain device (1). The free end of the drain device (1) is connected to a drain outlet. The drain connection device comprises a drain connection pipe (5) connected to the lower end of the inner cylinder (3). The other end of the drain connection pipe (5) is provided with a connection flange (6). The connection flange (6) is connected to the drain pipe (12). The drain device (1) is an ejector. A negative pressure suction port is provided at the upper end of the ejector. The negative pressure suction port is connected to the exhaust port (8) through an exhaust solenoid valve (10).

2. A siphon type unpowered decanting device according to claim 1, characterized in that: The free end of the siphon destroying device (2) is connected to the air inlet, and the other end is connected to the ventilation pipe (9).

3. A siphon type unpowered decanting device according to claim 1, characterized in that: The inner cylinder (3) and the outer cylinder (4) are arranged inside the processing unit cell body (17) via a fixing bracket (19).

4. A siphon type unpowered decanting device according to claim 1, characterized in that: The siphon breaking device (2) is a siphon breaking air intake solenoid valve.

5. A siphon type unpowered decanting device according to claim 1, characterized in that: The liquid level monitoring device (7) is a liquid level meter.

6. A siphon type unpowered decanting device according to claim 1, characterized in that: The electric control system controls the water collection device, the jet device (1), the drainage device, the siphon destroying device (2), and the liquid level monitoring device (7) through a PLC program.

7. A control method for a siphon type unpowered decanting device, applied to the siphon type unpowered decanting device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. The electronic control system performs self-inspection on the device and starts after passing the self-inspection; S2, the liquid level monitoring device detects the liquid level of the tank body and provides a liquid level signal to the electronic control system; S3, the electronic control system controls the drainage pump according to the liquid level signal obtained in S2, and the drainage pump starts when the set high liquid level is reached; S4. After the drainage pump is started, the jet device generates a suction effect to discharge the air in the water collection device, so that negative pressure is formed in the water collection device to achieve drainage; S5. When the water is drained to the set low liquid level, the drainage pump stops, the siphon breaking device starts, and air enters the top of the water collection device to break the siphon and block the drainage, and the cycle S2-S5 is repeated.

Images