Dosing metering pump for sewage pretreatment device

Abstract

The utility model discloses a dosing metering device, belongs to the technical field of sewage treatment devices, and particularly relates to a dosing metering pump for a sewage pretreatment device, which comprises a pump body, a driving component, a base, a first metering component, a second metering component and a feeding component, the interior of the pump body is in a cavity shape, the pump body is fixedly installed on the base, the first metering assembly and the second metering assembly are installed at the two ends of the pump body respectively and connected with the driving assembly, and the feeding assemblies are installed on the first metering assembly and the second metering assembly respectively. According to the dosing pump, the piston reciprocates in the cylinder body, liquid with a fixed volume is discharged in each stroke, the dosing amount in unit time can be very accurately controlled by accurately controlling the stroke length and / or stroke frequency, and the metering accuracy of the dosing pump is usually within + / -1% and is far higher than that of other types of dosing pumps.

Description

Technical Field

[0001] This utility model discloses a dosing metering device, belonging to the technical field of sewage treatment devices, specifically relating to a dosing metering pump for sewage pretreatment devices. Background Technology

[0002] Wastewater treatment is the process of purifying wastewater through physical, chemical, or biological technologies to meet discharge or reuse standards. Its role encompasses multiple dimensions, including environmental protection, resource utilization, health protection, and economic development. It can remove harmful substances from wastewater, reduce damage to the natural environment, and protect and restore aquatic ecosystems.

[0003] Traditional wastewater treatment equipment includes chemical dosing devices. Many chemical processes in wastewater treatment (such as neutralization, flocculation, sedimentation, disinfection, phosphorus removal, and nutrient removal) require precise control of the dosage of chemicals. Insufficient dosage will lead to substandard treatment results (such as turbid effluent, incomplete disinfection, and excessive phosphorus levels), while excessive dosage not only wastes expensive chemicals and increases operating costs, but may also cause secondary pollution (such as abnormal effluent pH, excessive sludge production, and residual toxic byproducts), and may even interfere with subsequent biological treatment processes. Utility Model Content

[0004] Purpose of the utility model: To provide a dosing metering pump for a wastewater pretreatment device to solve the aforementioned problems.

[0005] Technical solution: A dosing metering pump for a wastewater pretreatment device, the dosing metering pump comprising: a pump body, a drive assembly, a base, a first metering assembly, a second metering assembly, and a feed assembly;

[0006] The pump body has a cavity-like interior and is fixedly mounted on the base. The first metering component and the second metering component are respectively mounted on both ends of the pump body and connected to the drive component. The feeding component is respectively mounted on the first metering component and the second metering component.

[0007] The drive assembly includes: a motor, a coupling, a bearing, and a worm gear;

[0008] The first metering assembly includes: a first worm gear, a first crankshaft, a first crosshead, a first piston rod, a first piston, a first connecting housing, and a first cylinder block;

[0009] The second metering assembly includes: a second worm gear, a second crankshaft, a second crosshead, a second piston rod, a second piston, a second connecting housing, and a second cylinder block;

[0010] The feeding assembly includes: a feeding shell, a valve body, a valve cover, and a spring.

[0011] In a further embodiment, the motor is fixedly mounted on the top of the pump body, the bearing seat is located at the bottom of the pump body, one end of the worm gear is rotatably mounted in the bearing seat through a roller bearing, and the other end is connected to the motor shaft through the coupling.

[0012] In a further embodiment, one end of the first connecting shell is fixedly connected to one end of the pump body and the other end is fixedly connected to one end of the first cylinder body. The first worm gear is rotatably mounted on one side of the pump body via a rotating shaft and meshes with the worm. The first crankshaft is sleeved on the first worm gear and its end is fixedly connected to the first crosshead. The first crosshead is slidably mounted at the connection between the first connecting shell and the pump body. One end of the first piston rod is connected to the first crosshead. The first piston is connected to the other end of the first piston rod and slidably mounted in the first cylinder body. The first piston rod is connected to one end cap of the first cylinder body via a bushing.

[0013] In a further embodiment, one end of the second connecting shell is fixedly connected to the other end of the pump body, and the other end is fixedly connected to one end of the second cylinder body. The second worm gear is rotatably mounted on the other side of the pump body via a rotating shaft and meshes with the worm. The second crankshaft is sleeved on the second worm gear and its end is fixedly connected to the second crosshead. The second crosshead is slidably mounted at the connection between the second connecting shell and the pump body. One end of the second piston rod is connected to the second crosshead. The second piston is connected to the other end of the second piston rod and is slidably mounted in the second cylinder body.

[0014] In a further embodiment, the feeding assembly is respectively installed at the top and bottom of the first cylinder and the second cylinder of the first metering assembly and the second metering assembly;

[0015] The feed housing of the feeding assembly is fixedly installed on the top or bottom of the cylinder and connected to the inside of the cylinder. The valve body and the valve cover are located inside the feed housing. The valve cover is located on the upper part of the valve body. The spring is sleeved on the valve body and supports the valve cover.

[0016] Beneficial effects: The pump body of this invention uses a piston reciprocating within a cylinder to discharge a fixed volume of liquid per stroke (displacement). By precisely controlling the stroke length (typically steplessly adjustable within the range of 0%-100%) and / or the stroke frequency (rotation speed), the dosage (flow rate) per unit time can be controlled very accurately, with a metering accuracy typically within ±1%, far exceeding other types of dosing pumps; thus, the effects of this invention are as follows:

[0017] Precise metering: Delivering chemical agents with extremely high precision and repeatability.

[0018] Dosing as needed: The dosage is dynamically adjusted based on process requirements (set values) and real-time operating conditions (flow rate, water quality online monitoring feedback).

[0019] Guarantee the effect: Ensure that each chemical treatment unit (neutralization, flocculation, phosphorus removal, disinfection, denitrification, etc.) achieves the expected treatment effect, so that the final effluent can stably meet the discharge standards.

[0020] Optimize costs: Minimize the waste of chemical agents and reduce operating costs.

[0021] Safe and reliable: Safely transports various chemicals, ensuring stable operation of processes. Attached Figure Description

[0022] Figure 1 This is an isometric drawing of this utility model.

[0023] Figure 2 This is the front view of this utility model.

[0024] Figure 3 This is a cross-sectional view of the present invention.

[0025] Figure 4 This is a schematic diagram of the feeding assembly of this utility model.

[0026] Reference numerals: Pump body 1, Drive assembly 2, Base 3, First metering assembly 4, Second metering assembly 5, Feed assembly 6, Motor 20, Coupling 21, Shaft seat 22, Worm 23, First worm gear 40, First crankshaft 41, First crosshead 42, First piston rod 43, First piston 44, First connecting housing 45, First cylinder 46, Second worm gear 50, Second crankshaft 51, Second crosshead 52, Second piston rod 53, Second piston 54, Second connecting housing 55, Second cylinder 56, Feed housing 60, Valve body 61, Valve cover 62, Spring 63. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] A dosing metering pump for a wastewater pretreatment device includes: a pump body 1, a drive assembly 2, a base 3, a first metering assembly 4, a second metering assembly 5, and a feed assembly 6.

[0031] In one embodiment, such as Figures 1 to 2 As shown, the pump body 1 has a cavity-like interior and is fixedly mounted on the base 3. The first metering component 4 and the second metering component 5 are respectively mounted on both ends of the pump body 1 and connected to the drive component 2. The feeding component 6 is respectively mounted on the first metering component 4 and the second metering component 5.

[0032] The drive assembly 2 includes: a motor 20, a coupling 21, a bearing 22, and a worm gear 23;

[0033] The first metering component 4 includes: a first worm gear 40, a first crankshaft 41, a first crosshead 42, a first piston rod 43, a first piston 44, a first connecting shell 45, and a first cylinder 46;

[0034] The second metering component 5 includes: a second worm gear 50, a second crankshaft 51, a second crosshead 52, a second piston rod 53, a second piston 54, a second connecting shell 55, and a second cylinder 56;

[0035] The feeding assembly 6 includes: a feeding shell 60, a valve body 61, a valve cover 62, and a spring 63.

[0036] In one embodiment, such as Figures 1 to 3 As shown, the motor 20 is fixedly installed on the top of the pump body 1, the bearing seat 22 is located at the bottom of the pump body 1, one end of the worm gear 23 is rotatably installed in the bearing seat 22 through a roller bearing, and the other end is connected to the rotating shaft of the motor 20 through the coupling 21.

[0037] In one embodiment, such as Figures 1 to 3 As shown, one end of the first connecting shell 45 is fixedly connected to one end of the pump body 1, and the other end is fixedly connected to one end of the first cylinder 46. The first worm gear 40 is rotatably mounted inside the pump body 1 via a rotating shaft and meshes with the worm 23. The first crankshaft 41 is sleeved on the first worm gear 40, and its end is fixedly connected to the first crosshead 42. The first crosshead 42 is slidably mounted at the connection between the first connecting shell 45 and the pump body 1. One end of the first piston rod 43 is connected to the first crosshead 42. The first piston 44 is connected to the other end of the first piston rod 43 and slidably mounted inside the first cylinder 46. The first piston rod 43 is connected to one end cap of the first cylinder 46 via a bushing.

[0038] In one embodiment, such as Figures 1 to 3 As shown, one end of the second connecting shell 55 is fixedly connected to the other end of the pump body 1, and the other end is fixedly connected to one end of the second cylinder 56. The second worm gear 50 is rotatably mounted inside the pump body 1 on the other side via a rotating shaft and meshes with the worm 23. The second crankshaft 51 is sleeved on the second worm gear 50, and its end is fixedly connected to the second crosshead 52. The second crosshead 52 is slidably mounted at the connection between the second connecting shell 55 and the pump body 1. One end of the second piston rod 53 is connected to the second crosshead 52, and the second piston 54 is connected to the other end of the second piston rod 53 and slidably mounted inside the second cylinder 56.

[0039] In one embodiment, such as Figure 4 As shown, the feeding assembly 6 is respectively installed on the top and bottom of the first cylinder 46 and the second cylinder 56 of the first metering assembly 4 and the second metering assembly 5;

[0040] The feed housing 60 of the feed assembly 6 is fixedly installed on the top or bottom of the cylinder and connected to the inside of the cylinder. The valve body 61 and the valve cover 62 are located inside the feed housing 60. The valve cover 62 is located on the upper part of the valve body 61. The spring 63 is sleeved on the valve body 61 and supports the valve cover 62.

[0041] Working principle: When this utility model is in operation, the motor 20 in the drive assembly 2 first rotates, which drives the worm gear 23 to rotate through the coupling 21. As the worm gear 23 rotates, it meshes with the first worm wheel 40 and the second worm wheel 50 of the first metering assembly 4 and the second metering assembly 5, causing them to rotate. This, in turn, drives the first crankshaft 41 and the second crankshaft 51 to rotate, which in turn drives the first crosshead 42 and the second crosshead 52 to rotate, which in turn drives the first piston rod 43 and the second piston rod 53 to rotate, which in turn drives the first piston 44 and the second piston 5. 4. The pistons 44 and 54 move within the first cylinder 46 and the second cylinder 56 respectively. As the pistons 44 and 54 move, they cooperate with the feeding assembly 6 to form a switch. When the pistons are closed with the connecting shell, the connecting shell is poisoned, thus preventing the addition of medicine. When the pistons are not closed with the connecting shell, the medicine enters through the opening at the top of the connecting shell. At the same time, the pressure increases, causing the valve cover 62 to be pressed down by the spring 63, which causes the valve body 61 to move upward, thus connecting the connecting shell with the cylinder. The medicine then enters the cylinder and flows out from the feeding assembly 6 at the bottom.

[0042] Therefore, this utility model can be applied to the following situations:

[0043] pH adjustment / neutralization:

[0044] The pH value of the influent may be too high (alkaline) or too low (acidic), exceeding the suitable range for biological treatment or subsequent processes, requiring the addition of acid (such as sulfuric acid or hydrochloric acid) or alkali (such as sodium hydroxide or lime milk) for neutralization.

[0045] The metering pump precisely adjusts the dosage of acid or alkali based on the signal feedback from the online pH meter, stabilizing the pH value of the wastewater within the target range (usually 6.5-8.5) to ensure the activity of the biological community and the effectiveness of the chemical treatment process.

[0046] Chemical flocculation / coagulation:

[0047] In primary treatment (before sedimentation) or advanced treatment (such as chemical phosphorus removal, enhanced sedimentation), flocculants (such as PAC polyaluminum chloride, PFS polyferric sulfate) and / or coagulants (such as PAM polyacrylamide) are added to destabilize and aggregate fine suspended particles and colloidal substances in the water that are difficult to settle, forming larger flocs, which are then removed by subsequent sedimentation or flotation.

[0048] Precise control of flocculant / coagulant dosage is crucial. Insufficient dosage results in poor flocculation and high effluent turbidity; excessive dosage is not only wasteful but may also lead to sludge bulking or increase the difficulty of sludge treatment. Metering pumps ensure optimal dosage for best flocculation results and economic benefits.

[0049] Chemical phosphorus removal:

[0050] When biological phosphorus removal cannot meet the strict effluent phosphorus discharge standards, it is necessary to add metal salts (such as aluminum salt PAC, iron salt PFS / FeCl3) or lime to remove phosphates by forming insoluble precipitates.

[0051] Based on the influent phosphorus load and the set removal target, the metering pump precisely adds phosphorus removal agents to ensure that the total phosphorus concentration in the effluent meets the standard, while avoiding agent waste.

[0052] disinfect:

[0053] In the final stage of wastewater treatment, disinfectants (such as sodium hypochlorite, chlorine dioxide, ozone solution, etc.) need to be added to kill pathogenic microorganisms (bacteria, viruses, etc.) in the water and ensure that the effluent meets hygiene standards.

[0054] The metering pump precisely controls the amount of disinfectant added based on the outflow rate (proportional dosage) and the set target value for residual chlorine (or other disinfectant residue). This ensures sufficient disinfection effectiveness while preventing excessive addition that could produce toxic byproducts (such as trihalomethanes) or harm to the organisms in the receiving water body.

[0055] Adding nutrients:

[0056] In some industrial wastewater or domestic sewage with extremely low nutrient levels, it may be necessary to supplement nitrogen (such as urea or ammonia) or phosphorus (such as phosphate) nutrients in order to maintain the growth of microorganisms in the biological treatment system.

[0057] Metering pumps precisely add nutrients according to the needs of the biological treatment system, avoiding insufficient nutrients affecting treatment efficiency or excessive nutrients causing effluent to exceed standards.

[0058] Carbon source addition (denitrification):

[0059] In the denitrification stage of biological nitrogen removal processes (such as AO, A2O), sufficient organic carbon sources are required for denitrifying bacteria to reduce nitrates to nitrogen gas. When the influent carbon-to-nitrogen ratio is insufficient, additional carbon sources (such as methanol, sodium acetate, glucose, etc.) need to be added.

[0060] The metering pump precisely controls the amount of carbon source added based on the influent nitrate concentration, flow rate, and set denitrification efficiency requirements. Precise dosing ensures sufficient denitrification (total nitrogen meets the standard) while minimizing the cost of expensive carbon sources and avoiding excessive addition that could lead to increased effluent COD or sludge production.

[0061] This invention can adapt to changes in flow rate and complex operating conditions:

[0062] Wide flow rate adjustment range: The treatment capacity (influent flow rate) of wastewater treatment plants often fluctuates (e.g., diurnal variations, rainy season). Crankshaft piston pumps can linearly adjust the flow rate within a wide range (e.g., 10:1 or higher) by adjusting the stroke length or motor speed (frequency converter control), conveniently adjusting the dosage proportionally to changes in treatment capacity.

[0063] High pressure resistance: It can generate high discharge pressure to overcome back pressure at the dosing point (such as injection pressure pipelines, deep into the bottom of the water tank) and pipeline resistance.

[0064] Adaptable to different media: By selecting appropriate pump head materials (such as stainless steel, PVDF, PTFE lining) and sealing methods (such as packing seal, mechanical seal), it can safely and reliably transport various corrosive (acids, alkalis, sodium hypochlorite), viscous (polymer flocculant solutions), or chemical agents containing fine particles (such as lime milk) commonly used in sewage treatment.

[0065] This invention can ensure safe and reliable operation:

[0066] Leakage prevention: Good design and sealing can effectively prevent the leakage of toxic, harmful or corrosive chemicals, protecting operator safety and the environment.

[0067] Stable and reliable: The structure is relatively robust, and with proper maintenance, it can operate stably for a long time, ensuring the continuity of the dosing process.

[0068] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A dosing metering pump for a wastewater pretreatment device, characterized in that, The dosing metering pump includes: a pump body, a drive assembly, a base, a first metering assembly, a second metering assembly, and a feeding assembly; The pump body has a cavity-like interior and is fixedly mounted on the base. The first metering component and the second metering component are respectively mounted on both ends of the pump body and connected to the drive component. The feeding component is respectively mounted on the first metering component and the second metering component. The drive assembly includes: a motor, a coupling, a bearing, and a worm gear; The first metering assembly includes: a first worm gear, a first crankshaft, a first crosshead, a first piston rod, a first piston, a first connecting housing, and a first cylinder block; The second metering assembly includes: a second worm gear, a second crankshaft, a second crosshead, a second piston rod, a second piston, a second connecting housing, and a second cylinder block; The feeding assembly includes: a feeding shell, a valve body, a valve cover, and a spring.

2. The dosing metering pump for a wastewater pretreatment device according to claim 1, characterized in that, The motor is fixedly installed on the top of the pump body, the bearing seat is located at the bottom of the pump body, one end of the worm gear is rotatably installed in the bearing seat through a roller bearing, and the other end is connected to the motor shaft through the coupling.

3. The dosing metering pump for a wastewater pretreatment device according to claim 1, characterized in that, One end of the first connecting shell is fixedly connected to one end of the pump body, and the other end is fixedly connected to one end of the first cylinder body. The first worm gear is rotatably mounted on one side of the pump body via a rotating shaft and meshes with the worm. The first crankshaft is sleeved on the first worm gear, and its end is fixedly connected to the first crosshead. The first crosshead is slidably mounted at the connection between the first connecting shell and the pump body. One end of the first piston rod is connected to the first crosshead. The first piston is connected to the other end of the first piston rod and slidably mounted in the first cylinder body. The first piston rod is connected to one end cap of the first cylinder body via a bushing.

4. The dosing metering pump for a wastewater pretreatment device according to claim 1, characterized in that, One end of the second connecting shell is fixedly connected to the other end of the pump body, and the other end is fixedly connected to one end of the second cylinder body. The second worm gear is rotatably mounted on the other side of the pump body via a rotating shaft and meshes with the worm. The second crankshaft is sleeved on the second worm gear, and its end is fixedly connected to the second crosshead. The second crosshead is slidably mounted at the connection between the second connecting shell and the pump body. One end of the second piston rod is connected to the second crosshead, and the second piston is connected to the other end of the second piston rod and slidably mounted in the second cylinder body.

5. A dosing metering pump for a wastewater pretreatment device according to claim 1, characterized in that, The feeding assembly is respectively installed on the top and bottom of the first cylinder and the second cylinder of the first metering assembly and the second metering assembly; The feed housing of the feeding assembly is fixedly installed on the top or bottom of the cylinder and connected to the inside of the cylinder. The valve body and the valve cover are located inside the feed housing. The valve cover is located on the upper part of the valve body. The spring is sleeved on the valve body and supports the valve cover.

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