CN111847687A - Oil-water separation and recovery equipment for catering industry - Google Patents

Oil-water separation and recovery equipment for catering industry Download PDF

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Publication number
CN111847687A
CN111847687A CN202010531618.6A CN202010531618A CN111847687A CN 111847687 A CN111847687 A CN 111847687A CN 202010531618 A CN202010531618 A CN 202010531618A CN 111847687 A CN111847687 A CN 111847687A
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CN
China
Prior art keywords
oil
tank
water
pipe
siphon
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CN202010531618.6A
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Chinese (zh)
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不公告发明人
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周建萍
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Application filed by 周建萍 filed Critical 周建萍
Priority to CN202010531618.6A priority Critical patent/CN111847687A/en
Priority to CN201910813456.2A priority patent/CN110498476B/en
Publication of CN111847687A publication Critical patent/CN111847687A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D36/00Filter circuits or combinations of filters with other separating devices
    • B01D36/003Filters in combination with devices for the removal of liquids
    • B01D36/008Means to filter or treat the separated liquid
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/40Devices for separating or removing fatty or oily substances or similar floating material

Abstract

The invention discloses oil-water separation and recovery equipment for catering industry, which comprises an oil separation tank, a feeding tank and a discharge tank, wherein the oil separation tank is respectively connected with the feeding tank and the discharge tank through pipelines, and the feeding tank is higher than the oil separation tank and the oil separation tank is higher than the discharge tank in height position. The oil separation tank comprises a tank body, a core pipe and a filter layer, wherein the filter layer is arranged at the lower part in the tank body and divides the tank body into an oil-water cavity and a water inlet cavity, an oil discharge port is arranged on the side surface of the upper part of the oil-water cavity, and an air discharge port is arranged at the top of the oil-water cavity; the core pipe is inserted into the tank body from top to bottom, the lower end of the core pipe is positioned in the water inlet cavity, the top of the core pipe is respectively connected with a downcomer and a siphon pipe, the other end of the downcomer is connected with a feeding tank, the other end of the siphon pipe is connected with a discharge tank, and the highest point of the siphon pipe is lower than the bottom of the feeding tank and higher than an oil discharge port; the oil-water separation and recovery equipment further comprises a vacuum breaking pipe, one end of the vacuum breaking pipe is inserted into the tank body, the other end of the vacuum breaking pipe is connected to the highest point of the siphon pipe after being bent, and the highest point of the vacuum breaking pipe is higher than that of the siphon pipe.

Description

Oil-water separation and recovery equipment for catering industry
Technical Field
The invention relates to the field of environmental protection equipment, in particular to oil-water separation and recovery equipment for catering industry.
Background
Along with social development, hotels and dining halls are increasingly enlarged in scale and increased in quantity, and accordingly, the amount of restaurant sewage is increased. Restaurant sewage cannot be directly discharged to municipal sewage pipelines, although the state does not give a specific industrial discharge standard, the restaurant sewage only uses a third-level standard in integrated sewage discharge standard GB 8978-1996: the discharge amount of animal and vegetable oil in sewage is not higher than 100mg/L for all sewage disposal units.
At present, oil separation tanks are mostly adopted for removing oil from restaurant sewage in the prior art, and the basic principle is that grease in the sewage naturally rises by virtue of buoyancy under certain retention time by utilizing the difference of specific gravities of oil and water, so that the effect of oil-water separation is achieved. However, the traditional oil separation tank has the following obvious disadvantages: the oil-water separation effect is poor; the civil engineering is needed, the operation is troublesome, the occupied area is large, the environmental sanitation is affected (most of the illegal drainage oil is collected from the oil separation tank with irregular design and poor environmental condition), the pipeline is blocked and cleaned inconveniently, and the use and maintenance cost is high.
In the market, oil separators for oil-water separation have appeared, for example, "CN 201621174515.4 oil separator perspective oil discharge device" discloses the basic structure of the oil separator, the oil separator is placed on the ground for use, the setting position is not limited, no civil engineering is available, the oil separator is made of stainless steel, the rust-proof and corrosion-proof performance is good, and the sanitary condition is improved. However, the working principle of the device is not greatly improved compared with an oil separation tank, the device is simple in standing and layering, sewage needs to be pumped by a water pump, residues in original sewage need to be discharged by manually opening a discharge valve of a water inlet cavity, even though some patents mention automatic valves such as an electromagnetic valve used by the discharge valve, the device cannot really detect the residue amount in the water inlet cavity, and the device is 'automatic' and only means that a person operates the valve through a switch or is set to be opened periodically, and the device cannot be opened and closed according to the residue amount in the water inlet cavity due to automation; in addition, the oil separator and the oil-water separation bin of the prior art have some residues, so the device needs to be emptied and the inner space needs to be cleaned by water flow after the device is used for a certain period.
The treatment of restaurant sewage is very important from two aspects of environmental protection and resource utilization, and a more convenient, more energy-saving and better-treatment-effect oil removing device is needed to meet the development requirements of the market.
Disclosure of Invention
The invention aims to provide oil-water separation and recovery equipment for catering industry, which aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the oil-water separating and recovering apparatus for catering industry includes oil separating tank, feeding tank and draining tank, and the oil separating tank is connected via pipeline to the feeding tank and the draining tank.
Oily sewage discharged from a kitchen is led into a feeding box, can be directly connected to a kitchen drain pipe through a pipeline or can be manually poured, the oily sewage is subjected to coarse filtration in the kitchen, some large impurities are removed, only some fine residues are left, the device is used for treating the oily sewage with fine-crushed residues, and as the oil and the water are incompatible, the density of the oil is less than that of the water, therefore, the sewage can be kept still for layering only by providing the sewage to a place and making the sewage flow slowly, the oil separation tank is a standing position for oil-water separation, the oil separation tank is large, the sewage flowing into the oil separation tank from the feeding box flows slowly in the oil separation tank, therefore, the oil floats upwards, the oil liquid is discharged in the overflow mode at the upper part of the oil separation tank, and the water and the residue leave the oil separation tank from the other channel and are discharged to the discharge tank, so that the oil-water separation effect is achieved.
Further, the oil separation tank comprises a tank body, a core pipe and a filter layer, wherein the filter layer is arranged at the lower part in the tank body and divides the tank body into an oil-water cavity at the upper part and a water inlet cavity at the lower part, an oil discharge port is arranged on the side surface of the upper part of the oil-water cavity, and a gas discharge port is arranged at the top of the oil-water cavity and connected with the outside atmosphere; a base is arranged under the tank body,
the core pipe is inserted into the tank body from top to bottom, the lower end of the core pipe penetrates through the filter layer and is positioned in the water inlet cavity, the top of the core pipe is respectively connected with a downcomer and a siphon through a tee joint, the other end of the downcomer is connected with a feeding box, the other end of the siphon is connected with a discharge tank, and the highest point of the siphon is lower than the bottom of the feeding box and higher than an oil;
the oil-water separation and recovery equipment further comprises a vacuum breaking pipe, one end of the vacuum breaking pipe is inserted into the tank body, the other end of the vacuum breaking pipe is connected to the highest point of the siphon pipe after being bent, and the highest point of the vacuum breaking pipe is higher than that of the siphon pipe.
Set up core pipe, filter layer in the oil removal jar respectively to add a siphon and let this device possess siphon back flush slagging-off function:
the original sewage (mixture of oil, water and slag) in the feeding box enters the water inlet cavity through the sewer pipe and the core pipe, the speed of the original sewage is greatly reduced in the water inlet cavity, the separation process is started, because of the existence of the filter layer, residues are restrained in the water inlet cavity, only the oil water reaches the oil water cavity, the oil water separation is further carried out in the oil water cavity, the liquid level (when described later, most of the liquid level uses the oil level and the water level to more accurately determine a target object, the oil level is the upper surface of an oil layer, the water level is the upper surface of a water layer, when the target is inconvenient to determine or refers to the mixture, the mixture is replaced by the liquid level) is slowly raised, the upper layer oil overflows at the oil outlet and is collected, along with the continuous entering of the original sewage, the oil can overflow, the water level in the oil water cavity can be slowly raised, but the water can not be discharged out, an additional drainage channel for the water is required.
The siphon is exactly the escape way of water, and the interior liquid level of profit chamber rises, and the liquid level in the core pipe also can rise naturally, and the liquid level in the core pipe is higher because: resistance exists on a flow passage from the core pipe to the oil discharge port, under the working condition of continuously treating the fluid, the liquid level in the core pipe at the inlet position is higher, and the residue blocked by the filter layer further increases the filtering resistance to ensure that the liquid level in the core pipe is higher; when more oil is discharged from the oil-water cavity and the water level rises to be close to the oil discharge port, the liquid level in the core pipe rises to the siphon pipe and crosses the highest point of the siphon pipe, as long as liquid flows from the siphon pipe to the discharge tank, siphon on the siphon pipe can be established, because the discharge tank is lower than the oil separation tank, the liquid in the oil-water cavity can reversely pass through the filter layer and then is discharged to the discharge tank through the water inlet cavity, the core pipe and the siphon pipe, under the condition that the vacuum in the siphon pipe is not broken, the liquid in the oil separation tank can be continuously sucked away, the filter layer can be washed by the water flowing reversely, the filter layer and residues accumulated in the water inlet cavity are discharged to the discharge tank, because a small amount of oil liquid still exists on the upper layer of the water body in the oil-water cavity when the oil-water cavity is established, the siphon back flushing is disconnected after a period of time by a certain means, the hollow pipe is, the lower end of the hollow breaking pipe is exposed, the top of the oil-water cavity is directly connected with the atmosphere, so that the lower end of the hollow breaking pipe is directly connected with the atmosphere after being exposed, and the other end of the hollow breaking pipe is connected with the highest point of the siphon, so that the siphon state is broken, the reverse flow is stopped, the oil-water separation process of the next period is carried out, most sewage and residues are discharged out of the oil separation tank in the period, and the next period can continue to undertake the slag separation and oil separation operation in a good performance state.
It should be noted that although the original sewage from the feeding tank is also discharged to the discharge tank during siphon flow, the flow rate ratio can be controlled by a certain means, the pipe diameter of the sewer pipe is small or a flow control valve is added on the pipeline, the original sewage flow from the feeding tank to the core pipe is small, so that the oil amount directly discharged to the discharge tank is very small during siphon flow, and the sewage discharge standard can still be met. In addition, the height difference that the highest point of the siphon is higher than the oil discharge port is calculated accurately, which specifically comprises the following steps: the altitude difference is slightly less than the conversion water column of filter layer resistance under the device rated flow, if inconvenient calculation, then should confirm the altitude difference as the experiment when structural design, satisfies following target: the water in the oil-water cavity can not overflow from the oil outlet. The siphon tube can conveniently change the highest point position by using a hose.
Further, if let the water in the oil water intracavity all follow the siphon discharge oil-separating tank, then the high position of siphon and oil drain port needs comparatively accurately, can realize water oil separating and siphon drainage process under ideal condition, but during the in-service use, the effect is not very good because: if the height difference between the highest point of the siphon and the oil outlet is too small, the siphon drainage process is very frequent, because the resistance of the filter layer can be increased to enable the liquid in the core pipe to cross the highest point of the siphon to achieve siphon by only needing a little residue, and if the siphon flow is frequent, the frequency of directly discharging the original sewage discharged from the feeding tank to the discharge tank is high, the oil content of the discharge part is increased, and the excessive discharge is possible; if it is too large, the liquid level in the core tube may not rise enough to cross the highest point of the siphon tube when the original sewage residue content is small, so that siphon cannot be achieved and the water level in the oil-water chamber rises directly out of the oil drain outlet discharge device. In actual use, the content of the residue in the original sewage cannot be accurately determined, so that the design difficulty is high.
The oil-water separation and recovery equipment further comprises a drain pipe, a floating ball switch and an electric valve, one end of the drain pipe is connected to the middle position of the core pipe after being inserted into the tank body from the side face, the other end of the drain pipe is connected to the discharge groove, the highest point of the drain pipe is higher than the filter layer and lower than the oil discharge port, the density of a floating ball of the floating ball switch is between oil and water, the electric valve is installed on the drain pipe, the floating ball switch is electrically connected with the electric valve, the floating ball switch is provided with an upper switch signal position and a lower switch signal position, the upper signal position of the floating ball switch is lower than the oil discharge port, an electric valve opening signal is given when the.
The floater density of float switch is between oil, let the floater suspension on the interface of oil water between the water, the drain pipe, the addition of float switch and motorised valve lets water obtain another discharge passage, when the water level rose in the oil water cavity, the floater of float switch floats, give the motorised valve turn-on signal when reaching the signal location, the water is through the filter layer, the intake antrum, the core pipe, the drain pipe directly discharges outside the oil removal jar, the in-process also can be in the same direction as taking away the residue and washing, the existence of signal location makes the water level in the oil water cavity can not surpass this position on the float switch, the float switch still sets up a lower signal location and is in the oil water cavity in order to reserve some water, prevent that oil water intracavity liquid from discharging more, make fluid also discharged from the drain pipe.
When the content of the residue in the original sewage is small, the liquid level in the core pipe is difficult to reach the highest point of the siphon pipe at a higher position, the drainage pipe is mainly used for carrying out the drainage and slag removal tasks, and the drainage and slag removal tasks are carried out when the water level in the oil-water cavity reaches the signal position on the floating ball switch; when the content of the residue in the original sewage is high, the resistance of the filter layer is increased quickly, and the water level in the oil-water cavity is not increased much or little, a siphon process is established by the siphon, and the siphon takes over the tasks of draining water and discharging slag. The drainage pipe, the floating ball switch and the electric valve are added, so that the highest point of the siphon is no longer required to be accurate or even a compromise balance value cannot be obtained, and the device is more suitable for large-range change of residue content in actual use.
As optimization, the height difference between the bottom end of the hollow pipe and the oil drain port is smaller than or equal to the height difference between the lower signal position of the float switch and the filter layer. The lower signal position of float switch and the difference in height of filter layer represent profit chamber water storage volume, and the difference in height of broken hollow tube bottom and oil drain port represents the liquid volume of the palirrhea process of siphon, and the palirrhea process of siphon has only taken the water in the profit chamber under most conditions, and not oil.
Preferably, the float switch is a side-mounted switch, and the limit position of the up-and-down floating angle of a float of the float switch corresponds to the signal position of the up-and-down switching value of the float switch. Typically float switches have only one switching value position at level, whereas the float switch of the present application is a side mounted switch and establishes the up and down switching value signal position by up and down pitch angle limit positions, i.e.: with two switching value position signals.
Preferably, the discharge tank comprises a water collecting tank and a slag collecting hopper, the slag collecting hopper is made of a filter screen, the slag collecting hopper is placed above the water collecting tank, and one end of the discharge tank, which is connected with the siphon pipe, is discharged to the slag collecting hopper. The slag collecting hopper filters slag and water outside the oil separating tank, the water is directly discharged, and the slag is collected and treated.
As optimization, the filtering precision of the filtering layer is gradually increased from the water inlet cavity to the oil-water cavity. The filtering particle size of the filtering layer is gradually reduced, and the structural resistance of the filtering layer is not too large while the filtering capacity is ensured.
The tank body is cylindrical, the core pipe is positioned on the central shaft of the tank body, the lower surface of the water inlet cavity is in a circular ring shape with a convex middle part, and a half part of the circular ring body with zero inner diameter is cut off. Such setting up makes into water intracavity water inlet less, and the oil in the intracavity liquid of intaking only floats in the core pipe a minute quantity, and most fluid has floated to the profit intracavity, and a guide effect has occasionally in addition the backwash residue, does not have the dead angle, and the residue is all taken away by reverse flow's rivers.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the core pipe and the filter layer are arranged in the oil separation tank, so that the original sewage enters the oil-water cavity after being filtered for oil-water separation, oil overflows from the oil discharge port, the sewage and residues are discharged to the discharge tank through the drain pipe or the siphon pipe, the water and the residues are separated at the discharge tank, the oil-water separation is firstly carried out, the water-residue separation is carried out after the oil on the residues is fully flushed by water, the separated oil, water and residues are positioned outside, the oil separation tank becomes a component which does not need to be operated by people at all, the cleaning period of the oil separation tank is greatly prolonged, and the maintenance cost of the device is saved.
Drawings
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
FIG. 1 is a schematic diagram of the general structure of the present invention;
FIG. 2 is a schematic structural view of the oil-separating tank of the present invention;
FIG. 3 is a schematic perspective view of the present invention;
FIG. 4 is view A of FIG. 1;
FIG. 5 is a schematic flow chart of the oil draining state of the present invention;
FIG. 6 is a schematic flow chart of the slag discharge flushing state according to the present invention;
FIG. 7 is a flow chart illustrating the drainage state of the present invention.
In the figure: 1-oil separation tank, 11-tank body, 110-oil-water cavity, 111-water inlet cavity, 112-oil discharge port, 113-air release port, 12-core pipe, 13-filter layer, 14-base, 2-feeding box, 3-discharge tank, 31-water collecting tank, 32-slag collecting hopper, 41-sewer pipe, 42-water discharge pipe, 43-siphon pipe, 44-vacuum breaking pipe, 51-float switch and 52-electric valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the oil-water separation and recovery equipment for catering industry comprises an oil separation tank 1, a feeding tank 2 and a discharge tank 3, wherein the oil separation tank 1 is respectively connected with the feeding tank 2 and the discharge tank 3 through pipelines, the feeding tank 2 is higher than the oil separation tank 1, and the oil separation tank 1 is higher than the discharge tank 3 in height position.
Oily sewage discharged from a kitchen is led into the feeding box 2, can be directly connected to a kitchen drain pipe through a pipeline or can be manually poured, the oily sewage is subjected to coarse filtration in the kitchen, some large impurities are removed, only some fine residues are left, the device is used for treating the oily sewage with fine-crushed residues, and because the oil and the water are incompatible, the density of the oil is less than that of the water, therefore, the sewage can be kept still and layered only by providing the sewage to a place and making the sewage flow slowly, the oil separation tank 1 is the standing position for oil-water separation, the oil separation tank 1 is larger, the sewage flowing into the oil separation tank 1 from the feeding box 2 flows slowly in the oil separation tank 1, therefore, the oil floats upwards, the oil liquid is discharged in the form of overflow at the upper part of the oil separation tank 1, and the water and the residue leave the oil separation tank 1 from the other channel and are discharged to the discharge tank 3, so that the oil-water separation effect is achieved.
As shown in fig. 1 to 3, the oil-separating tank 1 includes a tank body 11, a core pipe 12 and a filter layer 13, the filter layer 13 is disposed at the lower part in the tank body 11, the filter layer 13 divides the tank body 11 into an oil-water chamber 110 at the upper part and a water inlet chamber 111 at the lower part, an oil discharge port 112 is disposed on the side surface of the upper part of the oil-water chamber 110, and an air discharge port 113 is disposed at the top of the oil-water chamber 110 and connected with the; a base 14 is arranged under the tank body 11,
the core pipe 12 is inserted into the tank body 11 from top to bottom, the lower end of the core pipe 12 penetrates through the filter layer 13 and is positioned in the water inlet cavity 111, the top of the core pipe 12 is respectively connected with a downcomer 41 and a siphon 43 through a tee joint, the other end of the downcomer 41 is connected with the feeding tank 2, the other end of the siphon 43 is connected with the discharge tank 3, and the highest point (H2 in figure 1) of the siphon 43 is lower than the bottom (H1 in figure 1) of the feeding tank 2 and higher than the oil discharge port 112 (H3 in;
the oil-water separation and recovery equipment further comprises an empty breaking pipe 44, one end of the empty breaking pipe 44 is inserted into the tank body 11, the other end of the empty breaking pipe 44 is connected to the highest point (H2 in the figure 1) of the siphon 43 after being bent, and the highest point (H6 in the figure 1) of the empty breaking pipe 44 is higher than the highest point (H2 in the figure 1) of the siphon 43.
The oil separation tank 1 is internally provided with a core pipe 12 and a filter layer 13 respectively, and a siphon 43 is added to ensure that the device has the siphon back-washing deslagging function:
The original sewage (mixture of oil, water and slag) in the feeding tank 2 enters the water inlet cavity 111 through the sewer pipe 41 and the core pipe 12, the speed of the original sewage is greatly reduced in the water inlet cavity 111, the separation process is started, the residue is restrained in the water inlet cavity 111 due to the existence of the filter layer 13, only the oil water reaches the oil water cavity 110, the oil-water separation is further carried out in the oil water cavity 110, the liquid level (hereinafter described, the oil level and the water level are mostly used for determining the target object more accurately, the oil level is the upper surface of the oil layer, the water level is the upper surface of the water layer, when the target is inconvenient to determine or indicate the mixture, the liquid level is replaced by the liquid level) slowly rises, as shown in figure 5, the upper oil overflows at the oil outlet 112 and is collected, the oil can overflow continuously along with the entering of the original sewage, the water level in the oil water cavity 110 can slowly rise, but the water cannot be discharged out, otherwise the device loses its original meaning of oil separation and therefore requires additional drainage channels for the water.
The siphon 43 is the drainage channel for water, the liquid level in the oil-water chamber 110 rises, the liquid level in the core tube 12 naturally also rises, and the liquid level in the core tube 12 is higher because: resistance exists on a flow passage from the core pipe 12 to the oil discharge port 112, under the working condition of continuously treating the fluid, the liquid level in the core pipe 12 at the inlet position is higher, and the filtering resistance is further increased by the residue blocked by the filtering layer 13, so that the liquid level in the core pipe 12 is higher; when more oil is discharged from the oil-water chamber 110 and the water level rises to approach the oil discharge port 112, the liquid level in the core tube 12 will rise to the siphon tube 43 and cross the highest point of the siphon tube 43, as shown in fig. 6, as long as liquid flows from the siphon tube 43 to the discharge tank 3, the siphon on the siphon tube 43 can be established, because the discharge tank 3 is lower than the oil-separating tank 1, the liquid in the oil-water chamber 110 will reversely pass through the filter layer 13 and then be discharged to the discharge tank 3 through the water inlet chamber 111, the core tube 12 and the siphon tube 43, under the condition that the vacuum in the siphon tube 43 is not broken, the liquid in the oil-separating tank 1 will be continuously sucked away, the reversely flowing water will flush the filter layer 13, take away the filter layer 13 and residue accumulated in the water inlet chamber 111 to be discharged to the discharge tank 3, because when the back flushing siphon is established, the upper layer of the water in the oil-water chamber 110 still has a small amount of oil, so the siphon, as shown in fig. 6, when the liquid level in the oil-water chamber 110 drops to a certain degree, the lower end of the blank pipe 44 is exposed, and because the top of the oil-water chamber 110 is directly connected with the atmosphere, the lower end of the blank pipe 44 is directly connected with the atmosphere after being exposed, and the other end of the blank pipe 44 is connected with the highest point of the siphon 43, the siphon state is broken, the reverse flow stops, and the oil-water separation process of the next cycle is performed, wherein most of the sewage and the residue are discharged out of the oil separation tank 1 in the cycle, so that the next cycle can continue to perform the slag and oil separation operation in a good performance state.
It should be noted that although the original sewage from the feeding tank 2 is also discharged to the discharging tank 3 during the siphon flow, the flow rate ratio can be controlled by a certain means, such that the pipe diameter of the sewer pipe 41 is small or a flow control valve is added on the pipeline, such that the original sewage flow from the feeding tank 2 to the core pipe 12 is small, and thus the amount of oil directly discharged to the discharging tank 3 during the siphon flow is very small, and still meets the sewage discharge standard. In addition, the height difference of the highest point (H2) of the siphon 43 higher than the oil discharge port 112 (H3) should be calculated more accurately, specifically: the altitude difference is slightly less than the conversion water column of filter layer resistance under the device rated flow, if inconvenient calculation, then should confirm the altitude difference as the experiment when structural design, satisfies following target: the water in the oil water chamber 110 cannot overflow from the oil drain port 112. The siphon 43 can be conveniently modified in the highest point position using a hose.
As described above, if the water in the oil-water chamber 110 is discharged from the siphon 43 to the oil-separating tank 1, the height positions of the siphon 43 and the oil discharge port 112 need to be accurate, and oil-water separation and siphon water discharge can be realized in an ideal state, but in actual use, the effect is not good because: if the height difference (H2-H3) between the highest point of the siphon tube 43 and the oil outlet 112 is too small, the siphon drainage process is very frequent, because only a little residue is needed to increase the resistance of the filter layer 13 to ensure that the liquid in the core tube 12 crosses the highest point H2 of the siphon tube 43 to achieve siphon, and if the siphon flows frequently, the raw sewage discharged from the feeding box 2 is discharged to the discharge tank 3 more frequently, so that the oil content at the discharge part is increased, and the discharge can exceed the standard; if (H2-H3) is too large, then at low raw sewage residue levels, the liquid level rise in the core tube 12 may not be sufficient to clear the highest point H2 of the siphon tube 43, so that siphoning cannot be achieved and the water level in the fuel water chamber 110 rises directly out of the drain 112. In actual use, the content of the residue in the original sewage cannot be accurately determined, so that the design difficulty is high.
As shown in fig. 1 and 4, the oil-water separation and recovery apparatus further includes a drain pipe 42, a float switch 51 and an electric valve 52, wherein one end of the drain pipe 42 is inserted into the tank 11 from the side and then connected to the middle position of the core pipe 12, the other end of the drain pipe 42 is connected to the drain tank 3, the highest point (H4 in fig. 1) of the drain pipe 42 is higher than the filter layer 13 (H5 in fig. 1) and lower than the drain port 112 (H3 in fig. 1), the float density of the float switch 51 is between oil and water, the electric valve 52 is installed on the drain pipe 42, the float switch 51 is electrically connected to the electric valve 52, the float switch 51 has two upper and lower signal positions, the upper signal position (H8 in fig. 3) of the float switch 51 is lower than the drain port 112 (H3 in fig. 1), the electric valve 52 is turned on when the float switch 51 is in the upper signal position, the lower signal position (H9 in fig. 3), when the float switch 51 sinks to the lower signal position, the closing signal of the electric valve 52 is given.
The density of a floating ball of the float switch 51 is between oil and water, so that the floating ball is suspended on an oil-water interface, the water is discharged from another discharge channel by adding the drain pipe 42, the float switch 51 and the electric valve 52, when the water level in the oil-water cavity 110 rises, the floating ball of the float switch 51 floats upwards, and when the water level reaches an upper signal position, an opening signal of the electric valve 52 is given, as shown in fig. 7, water is directly discharged out of the oil-separating tank 1 through the filter layer 13, the water inlet cavity 111, the core pipe 12 and the drain pipe 42, residues can be washed and taken away along the water in the process, the water level in the oil-water cavity 110 cannot exceed the upper signal position due to the signal position on the float switch 51, the float switch 51 is further provided with a lower signal position, so that a part of water is reserved in the oil-water cavity 110, the liquid in the oil-water cavity 110 is.
When the content of the residue in the original sewage is small, the liquid level in the core pipe 12 is difficult to reach the highest point H2 of the siphon 43 at a higher position, the drainage pipe 42 is mainly used for draining and deslagging, and when the water level in the oil-water cavity 110 reaches the signal position on the float switch 51, the drainage and deslagging are carried out; when the content of the residue in the original sewage is high, the resistance of the filter layer 13 increases quickly, and possibly the water level in the oil-water chamber 110 does not rise much, a siphon process is established by the siphon 43, and the siphon 43 takes on the drainage and slag discharge tasks. The drainage pipe 42, the float switch 51 and the electric valve 52 are added, so that the position of the highest point of the siphon 43 is no longer required to be accurate, even a compromise balance value cannot be obtained, and the device is more suitable for wide range change of residue content in actual use.
In order to increase the oil-water separation effect and prevent oil from being adhered to a filter layer or residues, an ultrasonic vibrator can be additionally arranged in the water inlet cavity 111 to enable surrounding liquid to generate low-amplitude high-frequency oscillation and enable the oil to be separated from the adhered part and float upwards.
As shown in fig. 1 and 4, the height difference between the bottom end of the blank pipe 44 and the oil drain port 112 is less than or equal to the height difference between the lower signal position of the float switch 51 and the filter layer 13. The difference between the lower signal position of the float switch 51 and the height of the filter layer 13 represents the water storage amount of the oil-water cavity 110, and the difference between the bottom end of the hollow breaking pipe 44 and the height of the oil outlet 112 represents the liquid amount of the siphon reverse flow process, so that in most cases, only the water in the oil-water cavity 110 is taken in the siphon reverse flow process, but not the oil.
As shown in fig. 4, the float switch 51 is a side-mounted switch, and the limit position of the float up-and-down floating angle of the float switch 51 corresponds to the up-and-down switching value signal position of the float switch 51. Typically float switch 51 has only one switching value position at level, whereas float switch 51 of the present application is a side mounted switch and establishes the up and down switching value signal position by up and down pitch angle limit positions, namely: the float switch 51 has two switching value position signals, the structure in the float switch 51 is special, the applicant of the float switch 51 does not find a proper model in the market, and the float switch manufacturer is seeking to customize and develop the float switch, so that the target effect is as described above. If the development is unsuccessful, a common reed-tube vertically mounted float level gauge can be used instead.
As shown in fig. 1 and 3, the drain tank 3 includes a water collecting tank 31 and a slag collecting hopper 32, the slag collecting hopper 32 is made of a filter screen, the slag collecting hopper 32 is placed above the water collecting tank 31, and one end of the drain tank 3, which is connected to a drain pipe 42 and a siphon pipe 43, is discharged to the slag collecting hopper 32. The slag collecting hopper 32 filters slag and water outside the oil-separating tank 1, the water is directly discharged, and the slag is collected and treated.
The filtering accuracy of the filter layer 13 is gradually increased from the water inlet chamber 111 to the oil-water chamber 110. The filtering particle size of the filtering layer 13 is gradually reduced, so that the filtering capability is ensured, and the structural resistance of the filtering layer 13 is not too large.
The tank body 11 is cylindrical, the core pipe 12 is positioned on the central shaft of the tank body 11, the lower surface of the water inlet cavity 111 is in a circular ring shape with a convex middle part, and a half part of the circular ring body with zero inner diameter is cut off. Such setting makes the water inlet less in the intake antrum 111, and the oil in the liquid only floats in core pipe 12 to a very small amount in the intake antrum 111, and most fluid has come up to the oily water cavity 110 in, and a guide effect has occasionally in addition the backwash residue, does not have the dead angle, and the residue is all taken away by reverse flow's rivers.
The use principle of the device is shown in the figures 5-7: and (3) during normal oil-water separation: the original sewage enters the water inlet cavity 111 from the sewer pipe 41 and the core pipe 12, the separation process is started, the oil layer floats on the water layer, and the oil layer overflows and is discharged from the oil discharge port 112; when the water level in the oil-water cavity 110 is high, the float switch 51 gives an opening signal to the electric valve 52, water and residues in the oil separation tank 1 are discharged out of the device from the water discharge pipe 42, when the water level in the oil-water cavity 110 drops to a position lower than the signal position of the float switch 51, the electric valve 52 is closed, the normal oil-water separation process is continued, when more residues are filtered out of the filter layer 13 and the resistance of the filter layer 13 is high, the liquid level in the core pipe 12 rises to cross the highest point of the siphon pipe 43, siphon is established, the water and the residues in the oil separation tank 1 are discharged to the discharge groove 3 from the siphon pipe 43, and when the liquid level in the oil-water cavity 110 drops to the bottom end of the hollow breaking pipe 44, the siphon.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (2)

1. The utility model provides an oil-water separation recovery plant for catering industry which characterized in that: the oil-water separation and recovery equipment comprises an oil separation tank (1), a feeding tank (2) and a discharge groove (3), wherein the oil separation tank (1) is respectively connected with the feeding tank (2) and the discharge groove (3) through pipelines, and in the height position, the feeding tank (2) is higher than the oil separation tank (1), and the oil separation tank (1) is higher than the discharge groove (3); the oil separating tank (1) comprises a tank body (11) and a filter layer (13) of a core pipe (12), the filter layer (13) is arranged at the lower part in the tank body (11), the filter layer (13) divides the interior of the tank body (11) into an oil-water cavity (110) positioned at the upper part and a water inlet cavity (111) positioned at the lower part, an oil discharge port (112) is arranged on the side surface of the upper part of the oil-water cavity (110), and a gas discharge port (113) is arranged at the top of the oil-water cavity (110) and is;
The core pipe (12) is inserted into the tank body (11) from top to bottom, the lower end of the core pipe (12) penetrates through the filter layer (13) and is located in the water inlet cavity (111), the top of the core pipe (12) is respectively connected with a downcomer (41) and a siphon (43) through a tee joint, the other end of the downcomer (41) is connected with the feeding tank (2), the other end of the siphon (43) is connected to the discharge tank (3), and the highest point of the siphon (43) is lower than the bottom of the feeding tank (2) and higher than the oil discharge port (112);
the oil-water separation and recovery equipment further comprises an empty breaking pipe (44), one end of the empty breaking pipe (44) is inserted into the tank body (11), the other end of the empty breaking pipe is connected to the highest point of the siphon (43) after being bent, and the highest point of the empty breaking pipe (44) is higher than that of the siphon (43);
the oil-water separation and recovery equipment further comprises a drain pipe (42), a floating ball switch (51) and an electric valve (52), one end of the drain pipe (42) is inserted into the tank body (11) from the side and then is connected to the middle position of the core pipe (12), the other end of the drain pipe (42) is connected to the discharge groove (3), the highest point of the drain pipe (42) is higher than the filter layer (13) and lower than the oil discharge port (112), the floating ball density of the floating ball switch (51) is between oil and water, the electric valve (52) is installed on the drain pipe (42), the floating ball switch (51) is electrically connected with the electric valve (52), the floating ball switch (51) is provided with an upper switch signal position and a lower switch signal position, the upper signal position of the floating ball switch (51) is lower than the highest point (112), the electric valve (52) gives an opening signal when the floating ball switch (51) floats to the upper signal, when the float switch (51) submerges to the descending signal position, an electric valve (52) closing signal is given;
The height difference between the bottom end of the hollow breaking pipe (44) and the oil drain port (112) is less than or equal to the height difference between the lower signal position of the float switch (51) and the filter layer (13);
the float switch (51) is a side-mounted switch, and the limit position of the up-and-down floating angle of a float of the float switch (51) corresponds to the signal position of the up-and-down switching value of the float switch (51).
2. The oil-water separation and recovery equipment for the catering industry as claimed in claim 1, wherein the oil-water separation and recovery equipment comprises: the tank body (11) is cylindrical, the core pipe (12) is positioned on the central shaft of the tank body (11), and the lower surface of the water inlet cavity (111) is in a circular ring shape with a convex middle part.
CN202010531618.6A 2019-08-30 2019-08-30 Oil-water separation and recovery equipment for catering industry Pending CN111847687A (en)

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