Liquid surface floating oil collection device and collection method thereof

Abstract

The present invention proposes a liquid surface floating oil collection device and a collection method thereof, belonging to the technical field of oil-water separation in the catering industry. The device comprises a floating collector, a connecting pipe, a sleeve, a water pump buffer box, a water pump, and a water collection tank. The floating collector is an inverted conical hollow sealing structure, the upper end of which is connected to the sleeve, the upper end of which is fixed to the top of the water collection tank, the connecting pipe connects the floating collector with the water pump buffer box, the floating collector floats freely up and down according to the working liquid level, a water pump is placed in the water pump buffer box, and the water pump buffer box is fixed in the water collection tank. The present invention solves the problem of a high oil content in the wastewater in the wastewater lifting box after an increase in wastewater discharge in existing finished catering oil-water separators, realizes the collection of floating oil on the liquid surface, and reduces the oil content in the wastewater. At the same time, it also solves the problem that when the floating collection device connected to the water pump fluctuates in the liquid level, the collector floats due to the water in the connecting pipe being emptied, and the wastewater cannot flow into the water pump, causing the water pump to run idle and form an air plug.

Description

Technical Field

[0001] The invention belongs to the technical field of oil-water separation in catering, and in particular relates to a liquid surface floating oil collection device and a collection method thereof. Background Art

[0002] The wastewater discharged by catering businesses during their operations must be equipped with oil-water separators according to the specifications and standards. The oil-water separators are selected based on their drainage capacity. However, due to the limitation of installation space and the consideration of reducing investment, smaller oil-water separators are often selected. Especially for the renovation of existing catering businesses, the oil-water separators are installed in the basement. The wastewater after oil removal needs to be lifted and discharged. This phenomenon is more obvious. The existing catering oil-water separators are usually divided into solid-liquid separation boxes, oil-water separation boxes and wastewater collection boxes or wastewater lifting boxes according to the standard requirements. The waste grease in the wastewater is limited by the effective volume of the oil-water separation box and cannot be fully removed, that is, it flows into the wastewater discharge box or the wastewater lifting box. After the wastewater is allowed to stand in the wastewater discharge box or the wastewater lifting box, the grease in the wastewater floats on the liquid surface, resulting in a floating oil layer on the liquid surface. If the waste grease is discharged together with the wastewater, the oil content of the wastewater discharged by the catering business will not meet the standard. Another situation is that when the lifting pump is working, it can only extract the wastewater below the liquid surface, and the grease floating on the liquid surface cannot be extracted. The grease accumulates over a long period of time, which can easily cause the liquid level control system to malfunction, or ferment to produce odor and pollute the air between equipment. Summary of the Invention

[0003] In order to solve the problems of the above-mentioned background technology, a device capable of collecting floating oil on the liquid surface is required, which can be applicable to both stable liquid surfaces and liquid surfaces that float up and down. The present invention aims to provide a liquid surface floating oil collection device and a collection method thereof.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a liquid surface floating oil collection device and a collection method thereof, comprising a floating collector, a connecting pipe, a sleeve, a water pump buffer box, a water pump and a water collecting tank, wherein the floating collector is an inverted conical hollow sealing structure, the upper end of which is connected to the sleeve, the upper end of the sleeve is fixed to the top of the water collecting tank, the connecting pipe connects the floating collector with the water pump buffer box, the floating collector can float freely up and down according to the working liquid level, a water pump is placed in the water pump buffer box, and the water pump buffer box is fixed in the water collecting tank.

[0005] Furthermore, the floating collector is a frustum-shaped sealed body with the cone bottom at the top and the cone top at the bottom. A raised water baffle is provided around the cone bottom, and the upper edge of the water baffle is lower than the working liquid level of the water collecting tank. A number of channels are provided on the surface of the cone. The upper ports of the channels are connected to the water collecting trough formed by the water baffle and the upper part of the floating collector, and the lower ports of the channels converge to the connecting port. The sum of the flow cross-sections of all channels is 1 to 4 times the flow cross-section of the connecting pipe. The connecting port is connected to the upper port of the connecting pipe. A guide rod is provided on the upper part of the floating collector, and the guide rod is placed in the sleeve and can move up and down.

[0006] Furthermore, the upper edge of the water baffle of the floating collector is lower than the working liquid level of the water collecting tank, and is 1 to 30 mm below the working liquid level.

[0007] Furthermore, the connecting pipe connected to the connection port of the floating collector has a flow cross-section of 100 to 5000 mm 2 .

[0008] Furthermore, the guide rod is nested and connected with the sleeve, the guide rod is fixedly connected to the bottom center of the floating collector cone, the upper end of the sleeve is fastened to the fixing part on the water collecting tank, and the upward and downward movement of the guide rod and the sleeve does not exceed the change range of the working liquid level.

[0009] Furthermore, the start-up of the water pump can be set according to different working liquid levels, and the stop of the water pump can be set according to the rise of the working liquid level or the running time.

[0010] A method for collecting floating oil using a liquid surface floating oil collection device specifically comprises the following steps:

[0011] The outer tube of the guide rod is fixedly connected to the center of the bottom of the frustum of the floating collector, and the other end of the guide rod is tightly connected to the fixing part on the water collecting tank. When the liquid level of the water collecting tank is impacted by the incoming water or the liquid level fluctuates due to the operation of the water pump, the guide rod has the function of damping and shock absorption, so that the floating collector floats above the liquid level of the water collecting tank, and the upper edge of the water inlet baffle is 1 to 30 mm lower than the working liquid level.

[0012] Before the water pump is started, because the floating collector is connected to the water pump buffer tank through a connecting pipe, the liquid level in the water pump buffer tank is consistent with the working liquid level in the water collecting tank. When the working liquid level in the water collecting tank reaches the set water pump start position, the water pump starts. At this time, the working liquid level in the water pump buffer tank drops, forming a potential difference with the working liquid level in the water collecting tank, so that the liquid in the water collecting tank can flow into the floating collector. The floating collector is blocked by a water baffle 1 to 30 mm below the working liquid level, so that the floating oil in the water collecting tank flows into the water collecting tank on the upper part of the floating collector, and flows into the water pump buffer tank through the channel through the connecting pipe, and is discharged through the discharge pipe by the running water pump. When the working liquid level in the water collecting tank reaches the set water pump stop position or reaches the set running time, the water pump stops, and the liquid surface floating oil collection device completes this round of working cycle. At this time, the liquid level in the water pump buffer tank is restored to be consistent with the working liquid level in the water collecting tank.

[0013] Compared with the prior art, the device and method for collecting oil floating on a liquid surface of the present invention have the following advantages:

[0014] The present invention solves the problem of high oil content in wastewater in the wastewater lifting box of the existing finished catering oil-water separator after the wastewater discharge volume increases, realizes the collection of floating oil on the liquid surface, and reduces the oil content of the wastewater. At the same time, it also solves the problem that when the liquid level fluctuates, the floating collection device connected to the water pump floats up after the water in the connecting pipe is emptied, and the wastewater cannot flow into the water pump, causing the water pump to run idle and forming an air plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 This is a structural layout diagram of a liquid surface oil collection device according to the present invention;

[0017] Figure 2 A top view of a floating collector embodiment 1 of a liquid surface oil collection device according to the present invention;

[0018] Figure 3 This is a cross-sectional view taken along line AA of a floating collector embodiment 1 of a liquid surface oil collection device according to the present invention;

[0019] Figure 4 A top view of a floating collector embodiment 2 of a liquid surface oil collection device according to the present invention;

[0020] Figure 5 This is a BB cross-sectional view of Example 2 of a floating collector of a liquid surface floating oil collection device described in the present invention.

[0021] In the figure: water collecting tank 1, connecting pipe 2, floating collector 3, water baffle 31, channel 32, connecting port 33, conduit 34, sleeve 4, water pump buffer box 5, discharge pipe 6, water pump 7, working liquid level 8. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0023] 1. Specific implementation method 1, see Figure 1-5 This embodiment describes a device for collecting floating oil on a liquid surface and a method for collecting the same, comprising a floating collector 3, a connecting pipe 2, a sleeve 4, a water pump buffer box 5, a water pump 7, and a water collecting tank 1. The connecting pipe 2 connects the floating collector 3 with the water pump buffer box 5. The floating collector 3 can float freely up and down according to the working liquid level 8. The water pump buffer box 5 contains the water pump 7, which is fixed in the water collecting tank 1. The floating collector 3 is an inverted conical sealing structure, with the cone bottom at the top and the cone top at the bottom. The cone bottom is surrounded by a raised water retaining wall. Plate 31, the upper edge of the water baffle 31 is lower than the working liquid level 8 of the water collecting tank 1, and a plurality of channels 32 are provided in the surface of the cone. The upper end of the channel 32 is connected to the water collecting tank formed by the water baffle 31 and the upper part of the floating collector 3, and the lower end of the channel 32 is collected at the connecting port 33. The sum of the flow cross-sections of all channels 32 is 1 to 4 times the flow cross-section of the connecting pipe 2. The connecting port 33 is connected to the upper end of the connecting pipe 2. A guide rod 34 is provided on the upper part of the floating collector 3, and the guide rod 34 is placed in the sleeve 4 and can move up and down.

[0024] The upper edge of the floating collector 3 is lower than the working liquid level 8 of the water collecting tank 1 and is located 1 to 30 mm below the working liquid level 8 .

[0025] The connecting pipe 2 connected to the connection port 33 has a flow cross section of 100 to 5000 mm 2 .

[0026] The guide rod 34 is nested and connected with the sleeve 4. The guide rod 34 is fixedly connected to the center of the bottom of the cone of the floating collector 3. The upper end of the sleeve 4 is fastened to the fixing part on the water collecting tank 1. The range of up and down movement of the guide rod 34 and the sleeve 4 does not exceed the range of change of the working liquid level 8.

[0027] The start of the water pump 7 can be set according to different working liquid levels 8, and the stop of the water pump 7 can be set according to the rise of the working liquid level 8 or the running time.

[0028] The floating collector 3 can be a truncated cone, as shown in the specific schematic diagram. Figure 2 and Figure 3 As shown, there are 8 channels 32 in a symmetrical radial design. The floating collector 3 can also be a quadrangular prism frustum. The specific schematic diagram is as follows: Figure 3 and Figure 4 As shown, four channels 32 are symmetrically arranged in a radial shape.

[0029] Collection method using the above-mentioned liquid surface oil collection device:

[0030] Before the water pump 7 is started, because the floating collector 3 is connected to the water pump buffer tank 5 through the connecting pipe 2, the liquid level in the water pump buffer tank 5 is consistent with the working liquid level 8 in the water collecting tank 1. When the working liquid level 8 in the water collecting tank 1 reaches the set water pump 7 start position, the water pump 7 is started. At this time, the working liquid level in the water pump buffer tank 5 drops, forming a potential difference with the working liquid level 8 in the water collecting tank 1, so that the liquid in the water collecting tank 1 can flow into the floating collector 3. The floating collector 3 is blocked by the water baffle 31 1 to 30 mm below the working liquid level 8, so that the floating oil in the water collecting tank 1 flows into the water collecting tank above the floating collector 3, and flows into the water pump buffer tank 5 through the channel 32 through the connecting pipe 2, and is discharged by the running water pump 7 through the discharge pipe 6. When the working liquid level 8 in the water collecting tank 1 reaches the set water pump 7 stop position or reaches the set running time, the water pump 7 stops, and the liquid surface floating oil collection device completes this round of working cycle. At this time, the liquid level in the water pump buffer tank 5 is restored to be consistent with the liquid level 9 in the water collecting tank 1.

[0031] The innovative core technologies of this invention are:

[0032] 1. The interior of the cone is a cavity that acts as a floating body. The water inlet of the floating collector 3 is formed by the water retaining plates 31 and the channels 32 around it. A number of channels 32 are provided on the surface of the cone. The upper ends of the channels 32 are connected to the water collecting tank formed by the water retaining plates 31 and the upper part of the floating collector 3. The lower ends of the channels 32 converge into the connecting port 33. The sum of the flow cross-sections of all channels 32 is 1 to 4 times the flow cross-section of the connecting pipe 2. The upper edge of the floating collector 3 is lower than the working liquid level 8 of the water collecting tank 1, and is 1 to 30 mm below the working liquid level 8.

[0033] 2. The guide rod 34 is nested and connected with the sleeve 4. The guide rod 34 is fixedly connected to the center of the bottom of the cone of the floating collector 3. The upper end of the sleeve 4 is fastened to the fixing part on the water collecting tank 1. The range of up and down movement of the guide rod 34 and the sleeve 4 does not exceed the range of change of the working liquid level 8.

[0034] Introduction to the R&D process:

[0035] In order to solve the problem of floating oil in the wastewater discharge chamber or the wastewater lifting chamber in the technical background, an oil floating collector is adopted. The existing liquid surface floating oil collection technology mostly belongs to the petrochemical industry, smelting, and the collection of debris on the surface of rivers, seas and lakes. It is suitable for collecting mineral oils or debris and garbage floating on the water surface. The floating oil on the surface of catering wastewater is mostly a mixture of animal and plant edible oils and small food residues. It is easy to rot and form a plate and is easy to adhere, and is not suitable for the existing liquid surface floating oil collection technology.

[0036] For example, the collection method of a turntable, crawler and scraper requires that the water temperature in the wastewater collection box be no less than 20 degrees Celsius, and an electric heating device needs to be installed, which increases energy consumption; for example, the use of a gear oil pump may cause oil pump failure due to fine residues or condensed oil in the grease; for example, the patent application document with patent application number CN202220584753.1 discloses a floating object collection device for a fishery pond, wherein a floating collector floats on the surface of the fish pond, a submersible pump is installed at the bottom of the fish pond, and the floating collector is connected to the submersible pump through a hose; the buoy of the floating collector is fixed at equal angles on the top peripheral wall of the shell cover, the siphon disc is installed on the top of the shell cover, the filter screen is mounted in the shell cover, and a gap is left between the filter screen and the peripheral wall of the shell cover, and a pipe joint is provided at the bottom of the shell cover, which is connected to the hose. In this patent, the floating collector is directly connected to the submersible pump and is used in water bodies with larger water surfaces, such as ponds, fish ponds, etc., but is not suitable for water tanks with smaller volumes. After the water pump is started, the water in the connecting hose is directly discharged by the water pump, and the buoyancy of the floating collector increases, floating to the surface, causing the water pump to be unable to pump water and forming an air entrapment (air plug) phenomenon.

[0037] During the research and development, solution 1 was first designed. A container for collecting floating oil is set in the water collection tank, and a submersible pump is installed in the container to extract the oil-containing wastewater. The submersible pump extracts the oil and water that enter the container from the container. When the liquid level of the water collection tank 1 is higher than the container, the oil pump must discharge all the water exceeding the container before the floating oil can flow into the container and be discharged by the oil pump. This also has the problem of low working efficiency. A liquid level measuring device is added to the water collection tank 1 to control the start of the oil pump in the container. When the liquid level of the water collection tank 1 is slightly higher than the container, the pump is started to allow the floating oil on the liquid surface to enter the container. The disadvantage is that the opening of the container is slightly large, and the amount of water flowing into the container is greater than the displacement of the pump. When the oil pump is working, it can only discharge the wastewater that has entered the container, while the floating oil still floats on the liquid surface in the container, failing to meet the design requirement of discharging the floating oil and wastewater together.

[0038] On this basis, the present invention further improves the water inlet of the container, expands the area of the container's inlet, and makes the contact surface of the floating oil on the liquid surface of the water collecting tank 1 flowing into the container's drain port larger, thereby increasing the instantaneous inflow of the floating oil. At the same time, the flow cross-section of the channel connecting the container's water inlet and the container cavity is reduced, so that the water flow of the floating oil and wastewater falling into the container is more concentrated, and the floating oil in the container is more easily discharged by the oil pump under the disturbance of the water flow. The disadvantage of this solution is that after the wastewater in the water collecting tank 1 is discharged, when its liquid level is lower than the height of the container, the grease floating on the liquid surface in the water collecting tank 1 cannot enter the container, resulting in low work efficiency. It can be seen that the acquisition of the limiting parameters of this application is non-obvious and is not a conventional technical means that can be easily thought of by those skilled in the art.

[0039] Solution 2. A floating oil collection device has been designed before. Like the solution of patent application number CN202220584753.1, the floating oil collection device is connected to the oil pump through a hose. This can solve the problem that the floating oil collection device cannot work normally when the liquid level in the water collection tank changes. However, when the oil pump is started, the water in the hose is instantly pumped out, the flow cross-section of the hose is reduced, and the water in the oil collection device cannot enter the water pump; the hose connecting the floating oil collection device and the water pump is improved and connected with a plastic hose. When the water pump is started, the water in the hose is instantly pumped out, and the water in the water collection tank flows into the hose through the water inlet of the collection device. Because the water flow speed is slow and cannot meet the displacement of the water pump, air is filled in the hose to form buoyancy to make the collection device float to the surface of the water, and floating oil and wastewater cannot enter the water pump, forming an air plug phenomenon in the impeller chamber of the water pump.

[0040] When the water pump 7 of the present invention is started to extract water from the water pump buffer box 5, after the water level in the water pump buffer box 5 drops, water will be replenished by the floating collector 3. The upper edge of the floating collector 3 is lower than the working liquid level 8 of the water collecting tank 1, and is 1 to 30 mm below the working liquid level 8. During this process, the connecting pipe 2 between the floating collector 3 and the water pump buffer box 5 is still full of water, and the floating collector 3 will not float up due to the reduction of the water amount in the connecting pipe 2, thereby solving the problem of air blockage in the water pump caused by the floating collector 3 floating up and the lack of water in the connecting pipe 2.

[0041] The present invention utilizes the Archimedes principle, and a water pump buffer box 5 is provided outside the oil pump. The floating oil collector 3 is designed to be an inverted cone. The interior of the cone is a cavity that acts as a floating body. The cone bottom is arranged at the top and the top is arranged at the bottom. The upper port of the channel 32 is connected to the water collection tank formed by the water baffle 31 and the upper part of the floating collector 3. The lower port of the channel 32 is collected at the connecting port 33, and the connecting port 33 is connected to the upper port of the connecting pipe 2. The sum of the flow cross-sections of all channels 32 is 1 to 4 times the flow cross-section of the connecting pipe 2. The connecting pipe 2 connected to the connecting port 33 has a flow cross-section of 100 to 5000 mm. 2A guide rod 34 is provided on the upper portion of the floating collector 3. The guide rod 34 is placed in the casing 4 and can move up and down. The solution of the present invention is formed through experimental prototype verification.

[0042] The embodiments of the present invention disclosed above are intended only to illustrate the present invention. The embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A liquid surface oil collection device, characterized in that: The invention comprises a floating collector (3), a connecting pipe (2), a sleeve (4), a water pump buffer box (5), a water pump (7) and a water collecting box (1), wherein the floating collector (3) is an inverted cone-shaped hollow sealing structure, the upper end of which is connected to the sleeve (4), the upper end of the sleeve (4) is fixed to the top of the water collecting box (1), the connecting pipe (2) connects the floating collector (3) with the water pump buffer box (5), the floating collector (3) can float freely up and down according to the working liquid level (8), the water pump (7) is placed in the water pump buffer box (5), and the water pump buffer box (5) is fixed in the water collecting box (1); The floating collector (3) has a cone bottom at the top and a cone top at the bottom. A raised water baffle (31) is provided around the cone bottom. The upper edge of the water baffle (31) is lower than the working liquid level (8) of the water collecting tank (1). A plurality of channels (32) are provided on the surface of the cone. The upper ends of the channels (32) are connected to the water collecting tank formed by the water baffle (31) and the upper part of the floating collector (3). The lower ends of the channels (32) converge to a connecting port (33). The connecting port (33) is connected to the upper end of the connecting pipe (2). A guide rod (34) is provided on the upper part of the floating collector (3). The guide rod (34) is placed in the sleeve (4) and can move up and down. The flow cross section of the connecting pipe (2) is 100 to 5000 mm 2 ; The guide rod (34) is connected to the sleeve (4) in a nested and fitting manner, the guide rod (34) is fixedly connected to the center of the bottom of the cone of the floating collector (3), and the range of the upward and downward movement of the guide rod (34) and the sleeve (4) does not exceed the range of change of the working liquid level (8); The sum of the flow cross-sections of all channels (32) is 1 to 4 times the flow cross-section of the connecting pipe (2).

2. The liquid surface oil collecting device according to claim 1, characterized in that: The upper edge of the floating collector (3) is lower than the working liquid level (8) of the water collecting tank (1), and is 1 to 30 mm below the working liquid level (8).

3. The liquid surface oil collecting device according to any one of claims 1-2, characterized in that: The water pump (7) is started according to different working liquid levels (8) settings, and the water pump (7) is stopped according to the rise of the working liquid level (8) or the running time.

4. A method for collecting floating oil using the liquid surface floating oil collection device according to claim 3, characterized in that: The specific steps include: Before the water pump (7) is started, the liquid level in the water pump buffer box (5) is consistent with the working liquid level (8) in the water collecting tank (1) because the floating collector (3) is connected to the water pump buffer box (5) through the connecting pipe (2). When the working liquid level (8) in the water collecting tank (1) reaches the set water pump (7) start position, the water pump (7) is started. At this time, the working liquid level in the water pump buffer box (5) drops, forming a potential difference with the working liquid level (8) in the water collecting tank (1), so that the liquid in the water collecting tank (1) can flow into the floating collector (3), while the floating collector (3) is below the working liquid level (8). The 1-30 mm water baffle (31) blocks the floating oil in the water collecting tank (1) and flows into the water collecting tank on the upper part of the floating collector (3), and flows into the water pump buffer tank (5) through the channel (32) and the connecting pipe (2), and is discharged by the running water pump (7) through the discharge pipe (6). When the working liquid level (8) in the water collecting tank (1) reaches the set stop position of the water pump (7) or reaches the set running time, the water pump (7) stops, and the liquid surface floating oil collection device completes this round of working cycle. At this time, the liquid level in the water pump buffer tank (5) is restored to be consistent with the working liquid level (8) in the water collecting tank (1).

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