CN111847686B - Oil-water separation and recovery equipment for catering industry - Google Patents

Abstract

The invention discloses an oil-water separation and recovery equipment for catering industry, comprising an oil separator tank, a feed box and a discharge tank. The oil separator tank is connected with the feed box and the discharge tank respectively through pipelines. Above the grease trap, the grease trap is above the drain tank. The oil separation tank includes a tank body, a core tube and a filter layer. A filter layer is arranged in the lower part of the tank body. The filter layer separates the tank body into an oil-water cavity and a water inlet cavity. ;The core tube is inserted into the tank from top to bottom, the lower end of the core tube is located in the water inlet cavity, the top of the core tube is connected to the downpipe and the siphon respectively, the other end of the downpipe is connected to the feed box, the other end of the siphon is connected to the discharge tank, and the The highest point is lower than the bottom of the feed tank and higher than the oil discharge port; the oil-water separation and recovery equipment also includes a broken pipe, one end of the broken pipe is inserted into the tank, the other end is bent and connected to the highest point of the siphon, and the highest point of the broken pipe is higher than the highest point of the siphon.

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 an oil-water separation and recovery equipment for catering industry.

Background technique

With the development of society, the scale and number of hotels, hotels and canteens are increasing day by day, and the amount of catering sewage generated is increasing. Catering sewage cannot be directly discharged to municipal sewage pipelines. Although the country has not yet given specific industry discharge standards, it only uses the third-level standard in the "Comprehensive Sewage Discharge Standard" GB8978-1996: all sewage units, animal and vegetable oils in sewage. The emission should not be higher than 100mg/L.

At present, traditionally, oil separators are used for degreasing of catering sewage. The basic principle is to use the different proportions of oil and water. Under a certain residence time, the grease in the sewage rises naturally with the help of buoyancy, so as to achieve the effect of oil-water separation. . However, traditional grease traps have the following obvious shortcomings: Poor oil-water separation effect; civil construction is required, which is not only troublesome, but also occupies land and affects environmental sanitation (most of the waste oil is collected from some grease traps with irregular design and poor environmental conditions) ), the pipeline blockage is inconvenient to clean up, and the use and maintenance costs are high.

On the market, oil separators have begun to appear for oil-water separation. For example, "CN201621174515.4 An oil separator see-through oil discharge device" discloses the basic structure of the oil separator. The oil separator is placed on the ground for use, and the setting position is different. Restricted, without civil construction, made of stainless steel, with good rust and corrosion resistance, and improved sanitary conditions. However, its working principle is not much improved compared to the grease trap. It is a simple static stratification. The sewage needs to be pumped by a water pump. The residue in the original sewage needs to be discharged manually by opening the discharge valve of the water inlet chamber. Some patents mention automatic valves such as solenoid valves used in discharge valves, but they cannot truly detect the amount of residue in the water inlet chamber. The "automatic" either only means that people operate the valve through a switch, or it is set to open regularly. , its automation cannot be opened and closed according to the amount of residue in the water inlet chamber; in addition, the existing oil separator and oil-water separation bin will also have some residues entering, so after a certain period of use, the device needs to be emptied and cleaned with water flow interior space.

The treatment of catering sewage is very important in terms of environmental protection and resource utilization. A more convenient, more energy-saving and better treatment effect is needed to meet the development needs of the market.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an oil-water separation and recovery equipment for the catering industry to solve the problems in the prior art.

To achieve the above object, the present invention provides the following technical solutions:

An oil-water separation and recovery equipment for catering industry, comprising an oil separator, a feed box, and a discharge tank. The oil separator is respectively connected with the feed box and the discharge tank through pipelines. At a height position, the feed box is higher than the oil separator. tank, the grease trap is higher than the drain tank.

The oily sewage discharged from the kitchen is introduced into the feed box, which can be directly connected to the kitchen drain by a pipe, or it can be dumped manually. The oily sewage has undergone rough filtration in the kitchen to remove some large debris. , only some relatively small residues are left. This device is used to treat oily sewage with finely divided residues. Since oil and water are incompatible, and the density of oil is lower than that of water, it only needs to provide a place for sewage to flow slowly. The oil trap is the static position for oil and water separation. The oil trap is large, and the sewage flowing into the oil trap from the feed box flows slowly in the oil trap, so the oil floats up and is in the oil trap. The upper part of the oil trap discharges the oil in the form of overflow, while the water and residues leave the oil trap from another channel and are discharged to the discharge tank to achieve the effect of oil-water separation.

Further, the oil separation tank includes a tank body, a core tube, and a filter layer. The lower part of the tank body is provided with a filter layer. The filter layer separates the tank body into an oil-water cavity located at the upper part and a water inlet cavity located at the lower part. The upper side of the oil-water cavity is provided with a drain. The oil port and the top of the oil-water cavity are provided with a vent to connect to the outside atmosphere; a base is provided under the tank body,

The core tube is inserted into the tank from top to bottom, the lower end of the core tube is located in the water inlet cavity through the filter layer, the top of the core tube is connected to the water pipe and the siphon pipe respectively through the tee, the other end of the water pipe is connected to the feed box, and the other end of the siphon pipe is connected to the Discharge slot, the highest point of the siphon is lower than the bottom of the feed box and higher than the oil discharge port;

The oil-water separation and recovery equipment also includes a broken tube. One end of the broken tube is inserted into the tank, and the other end is bent and connected to the highest point of the siphon. The highest point of the broken tube is higher than the highest point of the siphon.

The core tube and filter layer are respectively set in the oil separator, and a siphon tube is added to make the device have the function of siphon backwashing and slag removal:

The raw sewage (mixture of oil, water and slag) in the feed box enters the water inlet cavity through the sewer pipe and the core pipe. The speed of the raw sewage is greatly reduced in the water inlet cavity, and the separation process begins. Due to the existence of the filter layer, the residue will be Constrained in the water inlet cavity, only oil and water reach the oil-water cavity, and further oil-water separation is carried out in the oil-water cavity. The upper surface, the water level is the upper surface of the water layer. When the target is inconvenient to determine or refer to the mixture, it is replaced by the liquid level) and slowly rises. The upper oil overflows at the oil outlet and is collected. Continuously entering, the oil can overflow, and the water level in the oil-water cavity will gradually rise, but the water cannot be discharged from the oil outlet to the outside of the device, otherwise the device will lose the original meaning of oil separation, so it is necessary to let the water have another the discharge channel.

The siphon is the discharge channel of the water. When the liquid level in the oil-water cavity rises, the liquid level in the core tube will naturally rise, and the liquid level in the core tube will be higher, because: there is resistance on the flow channel from the core tube to the oil discharge port, and in the continuous Under the condition that the fluid is treated in an undisturbed manner, the liquid level in the core tube at the inlet position is relatively high, and the residue blocked by the filter layer further increases the filtration resistance and makes the liquid level in the core tube higher; when more oil is discharged from the oil-water cavity, the water level When it rises close to the oil discharge port, the liquid level in the core pipe will rise to the siphon pipe and cross the highest point of the siphon pipe. As long as there is liquid flowing from the siphon pipe to the discharge groove, the siphon on the siphon pipe can be established, because the position of the discharge groove is lower than the isolation groove. oil tank, so the liquid in the oil-water cavity will pass through the filter layer in reverse, and then be discharged to the discharge tank through the water inlet cavity, core tube and siphon tube. In the state where the vacuum in the siphon tube is not destroyed, the oil in the oil trap will be removed. The liquid is continuously sucked away, and the water flowing in the reverse direction will wash the filter layer, take away the filter layer and the residue accumulated in the water inlet cavity and discharge it to the discharge tank, because when the siphon is established, there is still a small amount of oil in the upper layer of the water body in the oil-water cavity. Therefore, the siphon backwash should be disconnected after a period of time by certain means, and the empty pipe should undertake this task. When the liquid level in the oil-water cavity drops to a certain level, the lower end of the broken empty pipe will be exposed because the top of the oil-water cavity is exposed It is directly connected to the atmosphere, so the lower end of the broken empty pipe is also directly connected to the atmosphere after being exposed, and the other end of the broken empty pipe is connected to the highest point of the siphon, so the siphon state is destroyed at this time, the reverse flow is stopped, and the next cycle of oil-water separation process, In this cycle, most of the sewage and residues have been discharged from the oil separator, so the next cycle can continue to undertake slag and oil separation operations with excellent performance.

It should be noted that although the raw sewage from the feed tank will also be discharged to the discharge tank during the siphon flow, the flow ratio can be controlled by certain means, making the diameter of the sewer pipe smaller or adding flow control to the pipeline. valve, so that the original sewage flow from the feed box to the core pipe is small, then the amount of oil directly discharged to the discharge tank is very small during the siphon flow, which can still meet the sewage discharge standard. In addition, the height difference between the highest point of the siphon pipe and the oil discharge port should be calculated more accurately, specifically: the height difference is slightly smaller than the converted water column of the filter layer resistance under the rated flow of the device. The height difference was determined experimentally to meet the following objectives: the water in the oil-water cavity cannot overflow from the oil discharge port. The siphon uses a hose for easy top point position changes.

Further, if the water in the oil-water cavity is discharged from the siphon pipe to the grease trap, the height position of the siphon pipe and the oil discharge port needs to be more accurate. In an ideal state, the oil-water separation and siphon drainage process can be realized, but in actual use, the effect is It is not very good, because: if the height difference between the highest point of the siphon tube and the oil discharge port is too small, the siphon drainage process will be very frequent, because only a little residue is needed to increase the resistance of the filter layer to make the inner tube of the core tube. The liquid crosses the highest point of the siphon pipe to achieve siphoning. If the siphon flow is frequent, the frequency of the raw sewage discharged from the feed box will be directly discharged to the discharge tank, which increases the oil content at the discharge place, and may discharge excessively; When the content of sewage residue is small, the liquid level in the core tube may not be high enough to cross the highest point of the siphon tube, so the siphon cannot be achieved, and the water level in the oil-water cavity directly rises to the outside of the oil discharge port. In actual use, the residue content of the original sewage cannot be accurately determined, so the design is difficult.

The oil-water separation and recovery equipment also includes a drain pipe, a float switch and an electric valve. One end of the drain pipe is inserted into the tank from the side and connected to the middle of the core pipe, and the other end of the drain pipe is connected to the drain tank. The highest point of the drain pipe is higher than the filter layer, Below the oil discharge port, the float density of the float switch is between oil and water, the electric valve is installed on the drain pipe, the float switch is electrically connected with the electric valve, the float switch has two switch signal positions up and down, and the float The upper signal position of the ball switch is lower than the oil discharge port, and the electric valve opening signal is given when the float switch floats to the upper signal position. The lower signal position of the float switch is higher than the highest point of the drain pipe, and the float switch dives to the lower signal position. When the electric valve closes signal is given.

The density of the float ball of the float switch is between oil and water, so that the float ball is suspended on the oil-water interface. The addition of the drain pipe, the float switch and the electric valve allows the water to obtain another discharge channel, and the water level in the oil-water cavity rises. When the float switch floats up, the electric valve opening signal is given when it reaches the upper signal position, and the water body is directly discharged out of the oil trap through the filter layer, water inlet cavity, core pipe, and drain pipe, and the residues will also be discharged in the process. Rinse and take it away. The existence of the signal position on the float switch makes it impossible for the water level in the oil-water cavity to exceed this position. The float switch also sets a lower signal position to keep a part of the water in the oil-water cavity and prevent the oil-water cavity from entering the oil-water cavity. There is a lot of liquid discharge, so that the oil is also discharged from the drain pipe.

When the residue content in the original sewage is small, it is difficult for the liquid level in the core pipe to reach the highest point of the siphon pipe at a higher position, and the drainage pipe is mainly responsible for the task of drainage and slag discharge. ; When the residue content in the original sewage is large, the resistance of the filter layer increases rapidly, and the water level in the oil-water cavity may not rise much, the siphon will establish the siphon process, and the siphon will undertake the task of drainage and slag discharge. The addition of drain pipe, float switch and electric valve makes the position setting of the highest point of the siphon no longer need to be so accurate or even impossible to obtain a compromise balance value, which is more suitable for the wide range of residue content in actual use.

As an optimization, the height difference between the bottom end of the hollow pipe and the oil discharge port is less than or equal to the height difference between the lower signal position of the float switch and the filter layer. The height difference between the lower signal position of the float switch and the filter layer represents the water storage volume in the oil-water cavity, and the height difference between the bottom end of the empty pipe and the oil discharge port represents the liquid volume in the siphon backflow process. In most cases, the siphon backflow process only takes Water from the oil-water chamber was used instead of oil.

As an optimization, the float switch is a side-mounted switch, and the upper and lower floating angle limit positions of the float switch correspond to the upper and lower switch signal positions of the float switch. Generally, the float switch has only one switch position at the level, while the float switch of the present application is a side-mounted switch and establishes the upper and lower switch signal positions through the upper and lower pitch angle limit positions, that is, with two switch position signals.

As an optimization, the discharge tank includes a water collection tank and a slag collection hopper. The slag collection hopper is made of a filter screen. The slag collection hopper is placed above the collection tank. The slag collecting hopper performs slag and water filtration outside the oil trap, the water is directly discharged, and the residue is collected and processed.

As an optimization, as an optimization, the filtration accuracy of the filter layer gradually increases from the water inlet cavity to the oil-water cavity. The filtration particle size of the filtration layer is gradually reduced to ensure the filtration capacity while the structural resistance of the filtration layer itself is not too large.

The tank body is cylindrical, the core tube is located on the central axis of the tank body, and the bottom surface of the water inlet cavity is a circular ring with a raised middle, similar to a circular body with a zero inner diameter cut in half. This setting makes the water inlet in the water inlet cavity smaller, and only a very small amount of oil in the liquid in the water inlet cavity floats in the core tube, and most of the oil floats into the oil-water cavity. A guiding effect, there is no dead angle, and the residue is carried away by the reverse flow of water.

Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a core tube and a filter layer in the oil separation tank, so that the original sewage enters the oil-water cavity for oil-water separation after being filtered once, and the oil is discharged from the oil discharge port. Overflow, while the sewage and residue are discharged to the discharge tank through the drain pipe or siphon. The water and the residue are separated at the discharge tank, and the oil-water separation is carried out first to ensure that the water fully washes away the oil on the residue, and then the water and residue are separated and separated. The oil, water and residue are all located outside, and the oil trap becomes a component that does not require human operation at all, and the cleaning cycle of the oil trap is greatly extended, saving the cost of device maintenance.

Description of drawings

In order to make the content of the present invention easier to understand clearly, the present invention will be described in further detail below according to specific embodiments and in conjunction with the accompanying drawings.

1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is the structural representation of the oil trap of the present invention;

Fig. 3 is the three-dimensional outline schematic diagram of the present invention;

Fig. 4 is view A in Fig. 1;

Fig. 5 is the flow chart of the oil discharge state of the present invention;

Fig. 6 is the schematic flow chart of the slag discharge flushing state of the present invention;

FIG. 7 is a schematic flow chart of the drainage state of the present invention.

In the picture: 1-oil trap, 11-tank, 110-oil-water cavity, 111-water inlet cavity, 112-oil outlet, 113-air outlet, 12-core tube, 13-filter layer, 14-base, 2-feeding box, 3-discharge tank, 31-water collection tank, 32-slag collection hopper, 41-downwater pipe, 42-drain pipe, 43-siphon pipe, 44-empty pipe, 51-float switch, 52- Electric valve.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figure 1, an oil-water separation and recovery equipment for the catering industry includes an oil separator tank 1, a feed tank 2, and a discharge tank 3. The oil separator tank 1 is connected to the feed tank 2 and the discharge tank 3 through pipelines, respectively. In the height position, the feed box 2 is higher than the oil trap 1, and the oil trap 1 is higher than the discharge tank 3.

The oily sewage discharged from the kitchen is introduced into the feed tank 2, which can be directly connected to the kitchen drain by a pipe, or it can be dumped manually. The oily sewage has been subjected to rough filtration in the kitchen to remove some large debris Only some relatively fine residues are left. This device is used to treat oily sewage with finely divided residues. Since oil and water are incompatible, and the density of oil is lower than that of water, it only needs to provide a place for sewage to flow slowly. The oil trap 1 is the static position for oil-water separation, the oil trap 1 is larger, and the sewage flowing into the oil trap 1 from the feed box 2 flows slowly in the oil trap 1 , so the oil floats up, and the oil is discharged in the form of overflow in the upper part of the oil trap 1, while the water and residues leave the oil trap 1 from another channel and are discharged to the discharge tank 3 to achieve the oil-water separation effect.

As shown in FIGS. 1 to 3 , the oil separation tank 1 includes a tank body 11 , a core tube 12 and a filter layer 13 . A filter layer 13 is arranged in the lower part of the tank body 11 , and the filter layer 13 divides the tank body 11 into an oil-water cavity located at the upper part. 110 and the water inlet cavity 111 located at the lower part, the oil-water cavity 110 is provided with an oil discharge port 112 on the upper side, and a vent 113 is provided on the top of the oil-water cavity 110 to connect to the outside atmosphere; the tank body 11 is provided with a base 14,

The core tube 12 is inserted into the tank body 11 from top to bottom. The lower end of the core tube 12 passes through the filter layer 13 and is located in the water inlet cavity 111. The top of the core tube 12 is connected to the downpipe 41 and the siphon 43 respectively through a tee, and the other end of the downpipe 41 is connected. Connect the feed box 2, the other end of the siphon 43 is connected to the discharge tank 3, the highest point of the siphon 43 (H2 in Figure 1) is lower than the bottom of the feed box 2 (H1 in Figure 1), higher than the oil discharge port 112 (Figure 1 ) in H3);

The oil-water separation and recovery equipment also includes a hollow pipe 44. One end of the hollow pipe 44 is inserted into the tank body 11, and the other end is bent and connected to the highest point of the siphon pipe 43 (H2 in FIG. 1). The highest point of the hollow pipe 44 (Figure 1 Middle H6) is higher than the highest point of siphon 43 (H2 in Figure 1).

A core tube 12 and a filter layer 13 are respectively set in the oil separator 1, and a siphon tube 43 is added to make the device have the function of siphon backwash and slag removal:

The raw sewage (mixture of oil, water and slag) in the feeding box 2 enters the water inlet chamber 111 through the downpipe 41 and the core tube 12. The speed of the raw sewage is greatly reduced in the water inlet chamber 111, and the separation process begins. In the presence of 13, the residue will be restrained in the water inlet chamber 111, and only the oil and water will reach the oil and water chamber 110, and the oil and water will be further separated in the oil and water chamber 110. To determine the target object, the oil level is the upper surface of the oil layer, and the water level is the upper surface of the water layer. When the target is inconvenient to determine or refers to the mixture, it is replaced by the liquid level) and slowly rises. As shown in Figure 5, the upper oil is draining. The oil port 112 overflows and is collected. With the continuous entry of the original sewage, the oil can overflow, and the water level in the oil-water chamber 110 will gradually rise, but the water cannot be discharged from the oil outlet 112 to the outside of the device. , otherwise the device loses the original meaning of oil separation, so it is necessary to allow water to have another discharge channel.

The siphon 43 is the water discharge channel, the liquid level in the oil-water cavity 110 rises, the liquid level in the core tube 12 will naturally rise, and the liquid level in the core tube 12 is higher, because: from the core tube 12 to the oil outlet 112 There is resistance on the flow channel. Under the condition of continuous processing of fluid, the liquid level in the core tube 12 at the inlet position is relatively high, and the residue blocked by the filter layer 13 further increases the filtration resistance, making the liquid level in the core tube 12 higher. higher; when more oil is discharged in the oil-water cavity 110 and the water level rises close to the oil discharge port 112, the liquid level in the core tube 12 will rise to the siphon 43 and cross the highest point of the siphon 43, as shown in Figure 6, as long as there is The liquid flows from the siphon pipe 43 to the discharge tank 3, then the siphon on the siphon pipe 43 can be established. Because the position of the discharge tank 3 is lower than the oil trap 1, the liquid in the oil-water cavity 110 will pass through the filter layer 13 in the reverse direction, and then pass through the filter layer 13. The water inlet cavity 111, the core tube 12, and the siphon tube 43 are discharged to the discharge tank 3. Under the condition that the vacuum in the siphon tube 43 is not destroyed, the liquid in the oil trap 1 will be continuously sucked away, and the water flowing in the reverse direction will be washed away The filter layer 13 takes away the filter layer 13 and the residue accumulated in the water inlet chamber 111 and discharges it to the discharge tank 3, because when the siphon is established, there is still a small amount of oil in the upper layer of the water body in the oil-water chamber 110, so it should be released by certain means. The siphon backwash is disconnected after a period of time, and the empty pipe 44 undertakes this task. As shown in FIG. 6, when the liquid level in the oil-water cavity 110 drops to a certain level, the lower end of the empty pipe 44 is exposed, because the oil and water The top of the cavity 110 is directly connected to the atmosphere, so the lower end of the broken hollow pipe 44 is also directly connected to the atmosphere after being exposed, and the other end of the broken hollow pipe 44 is connected to the highest point of the siphon pipe 43, so the siphon state is destroyed at this time, the reverse flow is stopped, and the next During the cycle of oil-water separation, most of the sewage and residues have been discharged from the oil separator 1, so the next cycle can continue to undertake the slag separation and oil separation operations with excellent performance.

It should be noted that although the raw sewage from the feed tank 2 will also be discharged to the discharge tank 3 during the siphon flow, the flow ratio can be controlled by certain means, so that the diameter of the sewer pipe 41 is smaller or the pipe The flow control valve is added to make the original sewage flow from the feed tank 2 to the core pipe 12 small, then during the siphon flow, the amount of oil directly discharged to the discharge tank 3 is very small, which can still meet the sewage discharge standard. In addition, the height difference between the highest point (H2) of the siphon pipe 43 and the oil discharge port 112 (H3) should be calculated more accurately. Specifically, the height difference is slightly smaller than the converted water column of the filter layer resistance under the rated flow of the device. If it is inconvenient to calculate , then an experiment should be done to determine the height difference during structural design, to meet the following objectives: the water in the oil-water cavity 110 cannot overflow from the oil discharge port 112 . Siphon 43 The highest point position can be easily changed using a hose.

According to the above, if all the water in the oil-water cavity 110 is discharged from the siphon pipe 43 to the oil trap 1, the height positions of the siphon pipe 43 and the oil discharge port 112 need to be more precise, and the oil-water separation and siphon drainage process can be realized under ideal conditions. However, in actual use, the effect is not very good, because: if the height difference (H2-H3) between the highest point of the siphon pipe 43 and the oil discharge port 112 is too small, the siphon drainage process will be very frequent, because only a little residue is needed. The resistance of the filter layer 13 can be increased so that the liquid in the core tube 12 can cross the highest point H2 of the siphon tube 43 to achieve siphoning. If the siphon flow is frequent, the raw sewage discharged from the feed box 2 is directly discharged to the discharge tank 3. , which increases the oil content at the discharge place, and the discharge may exceed the standard; if (H2-H3) is too large, then when the original sewage residue content is small, the liquid level in the core pipe 12 may not be enough to cross the highest point H2 of the siphon pipe 43, Therefore, the siphon cannot be achieved, and the water level in the oil-water chamber 110 is directly raised to the oil discharge port 112 to be discharged out of the device. In actual use, the residue content of the original sewage cannot be accurately determined, so the design is difficult.

As shown in Figures 1 and 4, the oil-water separation and recovery equipment also includes a drain pipe 42, a float 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 connected to the middle position of the core pipe 12. The other side of the drain pipe 42 is One end is connected to the drain tank 3. The highest point of the drain pipe 42 (H4 in Figure 1) is higher than the filter layer 13 (H5 in Figure 1) and lower than the oil discharge port 112 (H3 in Figure 1). The float switch 51 The density of the floating ball 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 switch signal positions, up and down. The upper signal position (H8 in Fig. 3) is lower than the oil discharge port 112 (H3 in Fig. 1), when the float switch 51 floats up to the upper signal position, the electric valve 52 is turned on, and the lower signal position of the float switch 51 ( H9 in FIG. 3 ) is higher than the highest point of the drain pipe 42 (H4 in FIG. 4 ), when the float switch 51 descends to the lower signal position, the electric valve 52 closes signal is given.

The density of the float ball of the float switch 51 is between oil and water, so that the float ball is suspended on the interface of oil and water. When the water level in 110 rises, the float ball of the float switch 51 floats up, and when it reaches the upper signal position, the electric valve 52 is given an opening signal. As shown in Figure 7, the water body passes through the filter layer 13, the water inlet cavity 111, the core tube 12, The drain pipe 42 is directly discharged out of the oil trap 1, and the residue is also washed and taken away in the process. The existence of the signal position on the float switch 51 makes it impossible for the water level in the oil-water chamber 110 to exceed this position. The float switch 51 A lower signal position is also set in order to keep a part of the water body in the oil-water cavity 110 to prevent the liquid in the oil-water cavity 110 from being discharged too much, so that the oil is also discharged from the drain pipe 42 .

When the residue content in the original sewage is small, it is difficult for the liquid level in the core pipe 12 to reach the highest point H2 of the siphon pipe 43 at a higher position. When the signal position is on, the water is drained and the slag is discharged; when the residue content in the original sewage is large, the resistance of the filter layer 13 increases rapidly, and the water level in the oil-water cavity 110 may not rise much, the siphon 43 will establish the siphon process. At this time, the siphon 43 Undertake the task of drainage and slag removal. The addition of the drain pipe 42, the float switch 51 and the electric valve 52 makes the position setting of the highest point of the siphon pipe 43 no longer required to be so accurate or even impossible to obtain a compromise balance value, which is more suitable for the large-scale variation of the residue content in actual use.

In order to increase the oil-water separation effect and prevent the oil from sticking to the filter layer or residue, an ultrasonic vibrator can be added in the water inlet chamber 111 to make the surrounding liquid oscillate at low amplitude and high frequency, so that the oil can be separated from the adhesion and float up. .

As shown in FIGS. 1 and 4 , the height difference between the bottom end of the hollow pipe 44 and the oil discharge 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 height difference between the lower signal position of the float switch 51 and the filter layer 13 represents the amount of water stored in the oil-water cavity 110, and the height difference between the bottom end of the empty pipe 44 and the oil discharge port 112 represents the liquid volume in the siphon reverse flow process. In most cases, the siphon The backflow process only uses the water in the oil-water chamber 110 instead of the oil.

As shown in FIG. 4 , the float switch 51 is a side-mounted switch, and the upper and lower floating angle limit positions of the float switch 51 correspond to the upper and lower switching signal positions of the float switch 51 . Generally, the float switch 51 has only one switch position at the level, while the float switch 51 of the present application is a side-mounted switch and establishes the upper and lower switch signal positions through the upper and lower pitch angle limit positions, that is, with two switch positions Signal, the structure of the float switch 51 is special, the applicant of this type of float switch 51 has not found a suitable model in the market, and is seeking custom development by the float switch manufacturer, and the target effect is as described above. If the development is unsuccessful, the common reed switch type vertically mounted float level gauge can be used instead.

As shown in Figures 1 and 3, the discharge tank 3 includes a water collection tank 31 and a slag collection hopper 32. The slag collection hopper 32 is made of a filter screen. The slag collection hopper 32 is placed above the water collection tank 31. The drain pipe 42 and the siphon pipe 43 are connected to discharge One end of the tank 3 is discharged to the slag collecting hopper 32 . The slag collecting hopper 32 performs slag and water filtration outside the grease trap 1, the water is directly discharged, and the slag is collected and processed.

The filtration precision of the filter layer 13 gradually increases from the water inlet cavity 111 to the oil-water cavity 110 . The filtration particle size of the filter layer 13 is gradually reduced, so as to ensure the filtration capacity, and at the same time, the structural resistance of the filter layer 13 itself will not be too large.

The tank body 11 is cylindrical, the core tube 12 is located on the central axis of the tank body 11, and the bottom surface of the water inlet cavity 111 is a circular ring with a middle convex, similar to a circular body with a zero inner diameter cut in half. This arrangement makes the water inlet in the water inlet chamber 111 smaller, and the oil in the liquid in the water inlet chamber 111 only floats in a very small amount in the core tube 12, and most of the oil floats into the oil-water chamber 110. There is a guiding effect when flushing the residue, there is no dead angle, and the residue is taken away by the reverse flow of water.

The operating principle of this device is shown in Figures 5-7: during normal oil-water separation: the original sewage enters the water inlet chamber 111 from the downpipe 41 and the core pipe 12, and the separation process begins. The oil layer floats on the water layer and overflows from the oil discharge port 112. Discharge; when the water level in the oil-water cavity 110 is high, the float switch 51 gives a signal to open the electric valve 52, the water and residue in the oil-separating tank 1 are discharged from the drain pipe 42, and the water level in the oil-water cavity 110 drops to the floating ball When the switch 51 is at the lower signal position, the electric valve 52 is closed, and the normal oil-water separation process continues. When the filter layer 13 has more residue filtered and the resistance of the filter layer 13 is relatively large, the liquid level in the core tube 12 rises and crosses the At the highest point of the siphon pipe 43, the siphon is established, the water and residue in the oil trap 1 are discharged from the siphon pipe 43 to the discharge tank 3, and when the liquid level in the oil-water cavity 110 drops to the bottom end of the hollow pipe 44, the siphon is broken, and the normal operation continues. Oil-water separation process.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (1)

1. An oil-water separation and recovery equipment for catering industry, characterized in that: the oil-water separation and recovery equipment comprises an oil-separating tank (1), a feeding box (2), a discharge tank (3), and the oil-separating tank (1) ) are respectively connected to the feed box (2) and the discharge tank (3) through pipelines. At the height position, the feed box (2) is higher than the oil trap (1), and the oil trap (1) is higher than the oil trap (1). A discharge tank (3); the oil separation tank (1) includes a tank body (11), a core tube (12), and a filter layer (13), and a filter layer (13) is arranged in the lower part of the tank body (11) to filter The layer (13) divides the tank body (11) into an oil-water cavity (110) located in the upper part and a water inlet cavity (111) located in the lower part, and the oil-water cavity (110) is provided with an oil discharge port (112), A vent (113) is provided on the top of the oil-water cavity (110) to connect to the outside atmosphere; The core tube (12) is inserted into the tank body (11) from top to bottom, the lower end of the core tube (12) passes through the filter layer (13) and is located in the water inlet cavity (111), and the top of the core tube (12) passes through The tee is connected to the water pipe (41) and the siphon pipe (43) respectively, the other end of the water pipe (41) is connected to the feed box (2), the other end of the siphon pipe (43) is connected to the discharge tank (3), the The highest point of the siphon pipe (43) is lower than the bottom of the feed box (2) and higher than the oil discharge port (112); The oil-water separation and recovery equipment further includes a hollow pipe (44), one end of the hollow pipe (44) is inserted into the tank body (11), and the other end is bent and connected to the highest point of the siphon (43), and the hollow pipe (44) is connected to the highest point of the siphon (43). The highest point of 44) is higher than the highest point of siphon (43); The oil-water separation and recovery equipment further includes a drain pipe (42), a float 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 connected to the core pipe (12). ) in the middle position, the other end of the drain pipe (42) is connected to the drain groove (3), the highest point of the drain pipe (42) is higher than the filter layer (13) and lower than the oil drain port (112), the float switch (51) ), the density of the floating ball is between oil and water, the electric valve (52) is installed on the drain pipe (42), the float switch (51) is electrically connected with the electric valve (52), and the float switch ( 51) There are two switch signal positions up and down. The upper signal position of the float switch (51) is lower than the oil discharge port (112). When the float switch (51) floats to the upper signal position, the electric valve (52) opening signal is given. The lower signal position of the float switch (51) is higher than the highest point of the drain pipe (42), and the electric valve (52) closing signal is given when the float switch (51) dives to the lower signal position; The discharge tank (3) includes a water collection tank (31) and a slag collection hopper (32), the slag collection hopper (32) is made of a filter screen, and the slag collection hopper (32) is placed above the water collection tank (31), The drain pipe (42) and the siphon pipe (43) are connected to one end of the discharge tank (3) and are discharged to the slag collecting hopper (32); The filtering precision of the filtering layer (13) gradually increases from the water inlet chamber (111) to the oil-water chamber (110).

Images