Oil smoke purification device for heat treatment of pit type carburizing furnace

Abstract

The utility model discloses a well type carburizing furnace heat treatment oil smoke purification device which comprises a smoke exhaust pipe, a spraying mechanism, a dust removal mechanism, an air filtering mechanism and a water tank, one side of the water tank is communicated with the spraying mechanism, the other side of the water tank is communicated with an oil-water separator, one side of the oil-water separator is provided with an oil discharge pipe, and the other side of the oil-water separator is provided with a water return pipe; a silt removing mechanism is arranged in the water tank, and a collecting box is arranged on the outer side of the water tank. The spraying mechanism and the dust removing mechanism are arranged, oil particles and water in air are directly filtered out, and then the air is purified and discharged through the air filtering mechanism; the water tank is arranged to settle impurities in water, the oil particle layer floats at the upper end of the water surface, the settled impurities are cleaned into the collecting tank by the silt removing mechanism, the oil particle layer is pumped out by the oil-water separator for treatment and then is recycled respectively, water and oil are recycled, operation is convenient, the whole treatment process is in an oil-water mixed state, and flammability is avoided. And safety and stability can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment processing, in particular to an oil fume purification device for heat treatment of a pit type carburizing furnace. Background Art

[0002] During the heat treatment process, especially during quenching or tempering, quenching oil or tempering oil is usually used for instant cooling correspondingly. If the oil fume generated by this temperature difference is directly discharged without proper treatment, it will pollute the environment. These oil gases contain substances harmful to the human body. If directly discharged into the atmosphere, it will have long-term effects on the environment and human health; in addition, the oil gas treatment equipment also needs to prevent oil gas leakage to avoid safety accidents such as fires or explosions. Content of the Utility Model

[0003] Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the utility model is to provide an oil fume purification device for heat treatment of a pit type carburizing furnace that can fully separate oil gas and oil-water, and ensure the safety of the separation process.

[0004] To solve the above technical problem, a technical solution adopted by the utility model is to provide an oil fume purification device for heat treatment of a pit type carburizing furnace, including an exhaust pipe communicated with the furnace cover of the carburizing furnace, a spraying mechanism and a dust removal mechanism sequentially communicated with the outlet end of the exhaust pipe. An air filter mechanism is communicated on one side of the dust removal mechanism, and a water tank is communicated on the other side. One side of the water tank is communicated with the spraying mechanism, and the other side is communicated with an oil-water separator. An oil discharge pipe communicated with the oil inlet of the carburizing furnace is arranged on one side of the oil-water separator, and a water return pipe communicated with the water tank is arranged on the other side; a silt removal mechanism is arranged in the water tank, and a collection box is arranged outside the water tank corresponding to the discharge end of the silt removal mechanism.

[0005] With the above structure, the oil fume generated by heat treatment is mixed with water by the spraying mechanism through the exhaust pipe, and then enters the dust removal mechanism in an oil-water state, directly filtering out the oil particles and moisture in the air. The filtered air is further filtered and purified for desulfurization and denitrification by the air filter mechanism, and finally discharged into the atmosphere. The moisture remaining in the spraying mechanism will also carry oil fume debris and flow back to the water tank, where the debris precipitates; the oil particles and moisture filtered out by the dust removal mechanism enter the water tank, and the oil particle layer floats on the upper end of the water surface. The precipitated debris is regularly cleaned to the collection box by the silt removal mechanism, and the oil particle layer is pumped out by the oil-water separator for oil-water separation treatment. The separated water flows back to the water tank through the water return pipe, and the separated oil flows back to the oil inlet of the carburizing furnace through the oil discharge pipe to achieve the purpose of recycling the cooling oil.

[0006] In order to quickly discharge the oil fume and form a jet-like flow to quickly enter the dust removal mechanism, and at the same time be able to spray water mist to quickly mix with the oil fume air. As a preference, the spraying mechanism includes a gas cylinder communicated with the exhaust pipe, a conical cover arranged in the gas cylinder, a water inlet pipe sleeved with a nozzle and communicated with one side of the gas cylinder, and an exhaust pipe communicated with the gas cylinder. An air outlet hole is provided at the small-diameter end of the conical cover, and the central axis of the air outlet hole and the central axis of the water inlet pipe are on the same horizontal plane and perpendicular to each other; a return pipe is communicated with the gas cylinder, and the water outlet end of the return pipe is communicated with the water tank.

[0007] In order to facilitate quick exhaust and drainage and reduce residues. As a preference, the dust removal mechanism includes a funnel cylinder communicated with the exhaust pipe. A plurality of first filter nets are arranged side by side in the axial direction corresponding to the air outlet end of the exhaust pipe in the funnel cylinder. A exhaust pipe with a built-in fan is communicated with the upper end of the funnel cylinder. A water outlet pipe communicated with the water tank is provided at the bottom of the funnel cylinder.

[0008] In order to facilitate blood stasis drainage and simplify the installation structure at the same time. As a preference, the water inlet end of the water inlet pipe extends into the water tank. The side plate on one side of the water tank is obliquely arranged with a narrower lower part and a wider upper part. There is a transition inclined section between the side plate and the inner bottom of the water tank; the silt removal mechanism includes a linear motor fixed on the outside of the water tank. The output end of the linear motor is provided with a connecting rod horizontally penetrating into the water tank. A push plate is hinged at the penetrating end of the connecting rod. The lower end surface of the push plate is in close contact with the bottom of the water tank; a collection box fixed on the outer wall of the carburizing furnace is provided on the outside of the side plate.

[0009] In order to facilitate quickly supplying water to the water inlet pipe to meet the use requirement of spraying water in a mist shape and facilitate controlling the water consumption at the same time. As a preference, a high-pressure pump and a regulating valve are sequentially communicated with the water inlet pipe along the water outlet direction.

[0010] In order to facilitate oil-water separation and facilitate separation and output, and simplify the structure at the same time. As a preference, an oil-water separator is provided on one side of the upper part of the water tank. The oil-water separator includes a water pump communicated with the upper part of the water tank and a water storage bucket communicated with the water outlet end of the water pump. A partition is vertically arranged in the water storage bucket. The partition divides the inside of the water storage bucket into a left water chamber and a right water chamber. A propeller connected to the output end of a power motor is arranged at the bottom of the left water chamber. There is a gap between the lower end surface of the partition and the inner bottom of the water storage bucket. A silica gel adsorption net is provided at the gap. An activated carbon filter net is also fixed on one side of the silica gel adsorption net. The left water chamber is communicated with an oil discharge pipe. The right water chamber is communicated with a return pipe. The water outlet end of the return pipe is communicated with the water tank.

[0011] In order to timely replenish water to meet the water use requirements, preferably, a liquid level sensor is further provided on one side of the water tank, a water replenishing pipe is communicated and provided on the other side of the water tank, a switching valve is communicated and provided on the water replenishing pipe, and the liquid level sensor, the high-pressure pump, the regulating valve, the blower, the regulating valve and the water extraction pump are all connected to the PLC controller.

[0012] In order to further purify the gas after dust removal, preferably, the air filter mechanism includes a filter cylinder communicated with the exhaust pipe, a second filter screen and a third filter screen which are arranged in a crosswise and staggered manner in the filter cylinder, and an air outlet pipe communicated with the filter cylinder. A quartz sand layer is provided on the second filter screen, and a ceramic fiber layer is provided on the third filter screen.

[0013] Beneficial effects: The utility model is provided with a spraying mechanism and a dust removal mechanism to directly filter out oil particles and moisture in the air, and then the air is purified and discharged by the air filter mechanism; a water tank is provided to precipitate sundries in the water, and the oil particle layer floats on the upper end of the water surface. The precipitated sundries are cleaned into the collection box by the silt removal mechanism, and the oil particle layer is extracted and processed by the oil-water separator, and then recycled respectively to realize the recycling of water and oil. The operation is convenient. The whole treatment process is in an oil-water mixed state, not flammable, and can ensure safety and stability. Brief Description of the Drawings

[0014] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0015] Figure 1 It is a structural schematic diagram of the present utility model.

[0016] The meanings of the reference numerals in the drawings are as follows:

[0017] Furnace lid - 1; Smoke exhaust pipe - 10; Air cylinder - 2; Conical cover - 20; Water pipe - 21; High-pressure pump - 211; Regulating valve - 212; Exhaust pipe - 22; Nozzle - 23; Air outlet hole - 24; Return pipe - 25;

[0018] Funnel cylinder - 3; First filter screen - 31; Blower - 32; Exhaust pipe - 33; Water outlet pipe - 34.

[0019] Water tank - 4; Linear motor - 40; Connecting rod - 41; Push plate - 42; Side plate - 43; Transition inclined section - 44; Water replenishing pipe - 45; Switching valve - 46;

[0020] Filter cylinder - 5; Second filter screen - 51; Third filter screen - 52; Air outlet pipe - 53;

[0021] Water storage bucket - 6; water pump - 60; oil drain pipe - 61; water return pipe - 62; propeller - 63; power motor - 64; partition - 65; silica gel adsorption net - 66; activated carbon filter - 67; collection box - 7; liquid level sensor - 8. Detailed implementation manner

[0022] As Figure 1 shown, the utility model includes a smoke exhaust pipe 10 communicated with the furnace cover 1 of the carburizing furnace, a spraying mechanism and a dust removal mechanism which are sequentially communicated with the air outlet end of the smoke exhaust pipe 10. An air filter mechanism is communicated and arranged on one side of the dust removal mechanism, and a water tank 4 is communicated and arranged on the other side. One side of the water tank 4 is communicated with the spraying mechanism, and the other side is communicated with an oil-water separator. An oil drain pipe 61 communicated with the oil inlet of the carburizing furnace is arranged on one side of the oil-water separator, and a water return pipe 62 communicated with the water tank 4 is arranged on the other side; a silt removal mechanism is arranged in the water tank 4, and a collection box 7 is arranged outside the water tank 4 corresponding to the discharging end of the silt removal mechanism.

[0023] Specifically, the spraying mechanism includes an air cylinder 2 communicated with the smoke exhaust pipe 10, a conical cover 20 arranged in the air cylinder 2, a water inlet pipe 21 sleeved with a nozzle 23 and communicated and arranged on one side of the air cylinder 2, and an exhaust pipe 22 communicated with the air cylinder 2. A high-pressure pump 211 and a regulating valve 212 are sequentially communicated and arranged on the water inlet pipe 21 along the water outlet direction; an air outlet hole 24 is arranged at the small-diameter end of the conical cover 20, and the central axis of the air outlet hole 24 and the central axis of the water inlet pipe 21 are on the same horizontal plane and perpendicular to each other; a return pipe 25 is communicated and arranged on the air cylinder 2, and the water outlet end of the return pipe 25 is communicated with the water tank 4.

[0024] The dust removal mechanism includes a funnel cylinder 3 communicated with the exhaust pipe 22. A plurality of first filter nets 31 are arranged side by side in the funnel cylinder 3 along the axial direction of the air outlet end of the exhaust pipe 22. An exhaust pipe 33 with a fan 32 built in is communicated and arranged at the upper end of the funnel cylinder 3, and a water outlet pipe 34 communicated with the water tank 4 is arranged at the bottom of the funnel cylinder 3.

[0025] The water inlet end of the water inlet pipe 21 extends into the water tank 4. The side plate 43 on one side of the water tank 4 is obliquely arranged with a narrow lower part and a wide upper part, and a transition inclined section 44 is arranged between the side plate 43 and the inner bottom of the water tank 4; the silt removal mechanism includes a linear motor 40 fixed on the outside of the water tank 4. The output end of the linear motor 40 is provided with a connecting rod 41 horizontally penetrating into the water tank 4. A push plate 42 is hinged at the penetrating end of the connecting rod 41, and the lower end surface of the push plate 42 is in close contact with the bottom of the water tank 4; a collection box 7 fixed on the outer wall of the carburizing furnace is arranged on the outside of the side plate 43.

[0026] On one side of the upper part of the water tank 4, an oil-water separator is provided. The oil-water separator includes a water pump 60 communicated with the upper part of the water tank 4 and a water storage bucket 6 communicated with the water outlet end of the water pump 60. A partition plate 65 is vertically arranged in the water storage bucket 6. The partition plate 65 divides the inside of the water storage bucket 6 into a left water chamber and a right water chamber. At the bottom of the left water chamber, a propeller 63 connected to the output end of a power motor 64 is arranged. There is a gap between the lower end face of the partition plate 65 and the inner bottom of the water storage bucket 6. A silica gel adsorption net 66 is arranged at this gap. An activated carbon filter net 67 is also fixedly arranged on one side of the silica gel adsorption net 66. The left water chamber is communicated with an oil discharge pipe 61, and the right water chamber is communicated with a water return pipe 62. The water outlet end of the water return pipe 62 is communicated with the water tank 4.

[0027] On one side of the water tank 4, a liquid level sensor 8 is also provided. On the other side of the water tank 4, a water supply pipe 45 is communicated. A switch valve 46 is communicated on the water supply pipe 45. The liquid level sensor 8, a high-pressure pump 211, a regulating valve 212, a blower 32, the switch valve 46, and the water pump 60 are all connected to a PLC controller (not marked).

[0028] The air filter mechanism includes a filter cylinder 5 communicated with an exhaust pipe 33, a second filter net 51 and a third filter net 52 arranged in a crosswise and staggered manner in the filter cylinder 5, and an air outlet pipe 53 communicated with the filter cylinder 5. A quartz sand layer is arranged on the second filter net 51, and a ceramic fiber layer is arranged on the third filter net 52.

[0029] The working principle of the present utility model is as follows:

[0030] As Figure 1 shown, first, turn on the blower 32 to start exhausting the gas in the funnel cylinder 3 and the air cylinder 2 which are communicated, and thereby enable the oil fume in the carburizing furnace to enter the air cylinder 2 through the exhaust pipe 10. Affected by the conical cover 20, the oil fume entering the air cylinder 2 is discharged at the position of the air outlet hole 24. Since the air outlet hole 24 is located at the small-diameter end of the conical cover 20, the gas velocity of the gas discharged from the air outlet hole 24 is accelerated and in a jet shape. At this time, water discharged from the position of the water inlet pipe 21 and pumped out from the water tank 4 by the high-pressure pump 211 forms a water mist under the action of the nozzle 23. In addition, the central axis of the air outlet hole 24 and the central axis of the water inlet pipe 21 are on the same horizontal plane and perpendicular to each other, that is, the oil fume is fully mixed with the water mist at the same time of spraying. The mixed oil fume gas is quickly discharged into the funnel cylinder 3 under the action of the blower 32, and the water remaining after spraying in the air cylinder 2 drips with large-particle impurities in the oil fume. After collection, it flows into the water tank 4 through the return pipe 25, and the large-particle impurities precipitate and accumulate to form oil contaminants.

[0031] The oil fume gas entering the funnel cylinder 3 is filtered by six first filter meshes 31 in the gas flow direction, directly filtering out the oil particles and moisture in the air. The filtered air enters the filter cylinder 5 through the fan 32. Inside the filter cylinder 5, the second filter mesh 51 and the third filter mesh 52 arranged in a cross-misaligned manner continuously filter the discharged gas, not only increasing the filtering position and the filtering contact area, but also delaying the gas retention time. At the same time, a quartz sand layer is provided on the second filter mesh 51 to achieve the purpose of desulfurization treatment, and a ceramic fiber layer is provided on the third filter mesh 52 to achieve the purpose of denitrification treatment. After such treatment, the gas is discharged into the atmosphere through the air outlet pipe 53.

[0032] The oil particles and moisture filtered out in the funnel cylinder 3 are collected in the funnel cylinder 3 and flow into the water tank 4 through the water outlet pipe 34, causing the oil particles to float on the upper end of the water surface. When the oil contaminants accumulate to a certain thickness, the linear motor 40 is started to drive the connecting rod 41 and the push plate 42 to move horizontally synchronously. Since the lower end surface of the push plate 42 is in close contact with the bottom of the water tank 4, it can push the precipitated oil contaminants to move. Among them, since the connecting rod 41 and the push plate 42 are hinged, and there is a transition inclined section 44 between the side plate 43 and the inner bottom of the water tank 4, the push plate 42 can push the oil contaminants to move out of the water tank 4 along the inclined side plate 43 and fall into the collection box 7 for collection.

[0033] Meanwhile, the oil particle layer floating on the water surface in the water tank 4 is pumped into the water storage bucket 6 by the water pump 60. At this time, the power motor 64 needs to be started to drive the propeller 63 to rotate, driving the generation of a spiral rotation in the left water chamber. Since there is a gap between the lower end surface of the partition plate 65 and the inner bottom of the water storage bucket 6, a silica gel adsorption net 66 is provided at this gap, and an activated carbon filter net 67 is fixedly provided on one side of the silica gel adsorption net 66, which can quickly adsorb the oil particle substances in the water, that is, perform two-layer full filtration on the water entering the right water chamber. The filtered oil particle substances are retained in the left water chamber and rotate upward along with the spiral water flow, thereby keeping the oil particle layer always floating on the water surface. Since the upper end of the pipe orifice of the return water pipe 62 and the lower end of the pipe orifice of the oil discharge pipe 61 are on the same horizontal plane, when it accumulates to a certain water level, the oil particle layer floating in the left water chamber flows back to the oil inlet of the carburizing furnace through the oil discharge pipe 61 to achieve the purpose of recycling the cooling oil; similarly, the water in the right water chamber flows back to the water tank 4 through the return water pipe 62 to make up for the water use, saving the water use cost and keeping the water level in the water storage bucket 6 stable, and preventing the water from flowing out through the oil discharge pipe 61. For the convenience of observation, it is advisable to set an observation window (not marked) on one side of the water storage bucket 6 corresponding to the left water chamber.

[0034] It should be noted that a liquid level sensor 8 is provided on one side of the water tank 4. When the water level in the water tank 4 is insufficient, the liquid level sensor 8 will send a signal to the PLC controller, and then the PLC controller will issue an instruction to open the switch valve 46 to directly fill the water tank 4 with water from the water supply pipe 45. At the same time, the PLC controller will also issue instructions to the blower 32, the high-pressure pump 211, and the regulating valve 212 to reduce the water output sprayed from the water inlet pipe 21 while reducing the rotational speed of the blower 32, so that the water tank 4 can be filled with water as soon as possible. Together with the water return volume of the water return pipe 62 and the return pipe 25, after the water level reaches the use height and remains stable, the PLC controller will issue instructions to the blower 32, the high-pressure pump 211, and the regulating valve 212 to restore to the normal use parameter state.

[0035] During the entire use process, the oil particles in the oil fume air are always mixed with water and are not easily heated and burned in the heat treatment environment. Even if there is external leakage during the flow process, the mixed water is not easily burned. The oil separated by the oil-water separator is directly returned to the oil inlet position of the carburizing furnace through the oil discharge pipe 61. The entire process is carried out in a closed pipe. Without contacting the outside air, the heat treatment environment cannot ignite the returned oil during the return time period, ensuring the safety of collecting the returned oil.

Claims

1. A pit-type carburizing furnace heat treatment oil fume purification device, characterized in that: The invention comprises a smoke exhaust pipe (10) connected to a furnace cover (1) of a carburizing furnace, a spray mechanism and a dust removal mechanism which are sequentially connected to the gas outlet end of the smoke exhaust pipe (10); an air filter mechanism is connected to one side of the dust removal mechanism, and a water tank (4) is connected to the other side; one side of the water tank (4) is connected to the spray mechanism, and the other side is connected to an oil-water separator; one side of the oil-water separator is provided with an oil drain pipe (61) connected to the oil inlet of the carburizing furnace, and the other side is provided with a water return pipe (62) connected to the water tank (4); a silt removal mechanism is provided in the water tank (4), and a collection box (7) is provided on the outside of the water tank (4) at a position corresponding to the discharge end of the silt removal mechanism.

2. A pit type carburizing furnace heat treatment oil fume purification device as claimed in claim 1, characterized in that: The spray mechanism comprises an air cylinder (2) connected to a smoke exhaust pipe (10), a conical cover (20) arranged in the air cylinder (2), a water inlet pipe (21) provided with a nozzle (23) and connected to one side of the air cylinder (2), and an exhaust pipe (22) connected to the air cylinder (2); an air outlet hole (24) is provided at the small-diameter end of the conical cover (20); the central axis of the air outlet hole (24) and the central axis of the water inlet pipe (21) are on the same horizontal plane and are perpendicular to each other; a return pipe (25) is connected to the air cylinder (2); the water outlet end of the return pipe (25) is connected to a water tank (4).

3. A pit type carburizing furnace heat treatment oil fume purification device as claimed in claim 2, characterized in that: The dust removal mechanism comprises a funnel barrel (3) connected to an exhaust pipe (22), a plurality of first filter screens (31) are arranged side by side in the axial direction of the exhaust pipe (22) in the funnel barrel (3), an exhaust pipe (33) with a built-in fan (32) is connected to the upper end of the funnel barrel (3), and a water outlet pipe (34) connected to a water tank (4) is provided at the bottom of the funnel barrel (3).

4. A pit type carburizing furnace heat treatment oil fume purification device as claimed in claim 2, characterized in that: The water inlet end of the water inlet pipe (21) extends into the water tank (4); the side plate (43) on one side of the water tank (4) is obliquely arranged to be narrow at the bottom and wide at the top; a transition oblique section (44) is arranged between the side plate (43) and the inner bottom of the water tank (4); the desilting mechanism comprises a linear motor (40) fixedly arranged on the outside of the water tank (4); the output end of the linear motor (40) is provided with a connecting rod (41) horizontally inserted into the water tank (4); a push plate (42) is hingedly arranged at the insertion end of the connecting rod (41), and the lower end surface of the push plate (42) is in contact with the bottom of the water tank (4); a collecting box (7) fixedly arranged on the outer side wall of the carburizing furnace is arranged on the outer side of the side plate (43).

5. A pit type carburizing furnace heat treatment oil fume purification device as claimed in claim 4, characterized in that: A high-pressure pump (211) and a regulating valve (212) are sequentially connected on the water inlet pipe (21) along the water outlet direction.

6. A pit-type carburizing furnace heat treatment oil fume purification device as claimed in claim 5, characterized in that: An oil-water separator is provided on one side of the upper part of the water tank (4), and the oil-water separator comprises a water pump (60) connected to the upper part of the water tank (4) and a water storage barrel (6) connected to the water outlet of the water pump (60). A partition (65) is vertically provided in the water storage barrel (6), and the partition (65) divides the water storage barrel (6) into a left water chamber and a right water chamber. A propeller (63) connected to the output end of the power motor (64) is provided at the bottom of the left water chamber. A gap is provided between the lower end surface of the partition (65) and the inner bottom of the water storage barrel (6). A silica gel adsorption net (66) is provided at the gap. An activated carbon filter net (67) is also fixed on one side of the silica gel adsorption net (66). The left water chamber is connected to the oil discharge pipe (61), and the right water chamber is connected to the return water pipe (62). The water outlet of the return water pipe (62) is connected to the water tank (4).

7. A pit-type carburizing furnace heat treatment oil fume purification device as claimed in claim 6, characterized in that: A liquid level sensor (8) is also provided on one side of the water tank (4), and a water supply pipe (45) is connected to the other side of the water tank (4), and a switch valve (46) is connected to the water supply pipe (45). The liquid level sensor (8), the high-pressure pump (211), the regulating valve (212), the fan (32), the switch valve (46) and the water pump (60) are all connected to a PLC controller.

8. A pit type carburizing furnace heat treatment oil fume purification device as claimed in claim 4, characterized in that: The air filter mechanism comprises a filter cartridge (5) connected to an exhaust pipe (33), a second filter screen (51) and a third filter screen (52) arranged in a staggered manner in the filter cartridge (5), and an air outlet pipe (53) connected to the filter cartridge (5), a quartz sand layer being provided on the second filter screen (51), and a ceramic fiber layer being provided on the third filter screen (52).

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