Diesel engine crank case ventilation device with residual oil discharge function

Abstract

The invention belongs to the technical field of diesel engine crank cases, and particularly relates to a diesel engine crank case ventilation device with residual oil drainage, which comprises an oil extraction machine body, an exhaust pipe is fixedly connected to the side wall of the bottom of the oil extraction machine body, a connecting hose is connected to the end part of the exhaust pipe, and a conveying pipe is fixedly connected to the end part of the connecting hose. The side wall of the conveying pipe is fixedly connected with a backflow preventing assembly, leakage of smoke at the connecting position of the exhaust pipe, the connecting hose and the conveying pipe can be avoided through the arrangement of the sealing assembly, whether liquefied residual oil is discharged or not is controlled through the first residual oil leakage preventing valve, and the situation that the residual oil flows back into the connecting hose and the exhaust pipe can be reduced through the arrangement of the backflow preventing assembly; liquefied residual oil discharged by the first residual oil leakage prevention valve and the backflow prevention assembly can be collected through the collection assembly, smoke discharged by the air cap can be filtered and purified through the purification grasping device, environmental pollution is reduced, and the influence of residual oil backflow of the diesel engine crank case ventilation device on the effect is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engine crankcases, in particular to a diesel engine crankcase venting device with residual oil discharge. Background Art

[0002] The crankcase is an important component of a diesel engine. It is usually located at the bottom of the diesel engine and is mainly used to support and protect moving parts such as the crankshaft and connecting rod. Lubricating oil is also stored in the crankcase to lubricate and cool these moving parts to ensure the normal operation of the diesel engine.

[0003] The diesel engine crankcase breather, also known as the crankcase ventilation device, is mainly used to adjust the pressure in the crankcase to prevent the pressure in the crankcase from being too high, and at the same time discharge the exhaust gas in the crankcase to avoid damage to the engine by the exhaust gas.

[0004] After long-term use, it is found that the diesel engine needs to discharge oil smoke during operation, and there will be vaporized residual oil in the oil smoke. After the residual oil comes into contact with the exhaust pipe, since the temperature of the exhaust pipe is lower than the operating temperature of the diesel engine, the vaporized residual oil will liquefy due to the cold. The liquefied residual oil will flow back into the diesel engine along the exhaust pipe, thus affecting the use of the diesel engine.

[0005] To this end, the present invention provides a diesel engine crankcase venting device with residual oil discharge. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is: the diesel engine crankcase ventilation device with residual oil discharge described in the present invention comprises an oil production machine body, an exhaust pipe is fixedly connected to the bottom side wall of the oil production machine body, a connecting hose is connected to the end of the exhaust pipe, a delivery pipe is fixedly installed on the end of the connecting hose, a backflow prevention component is fixedly connected to the side wall of the delivery pipe, a sealing component is fixedly connected to the side wall of the connecting hose, the end of the delivery pipe is connected to a first oil and gas pipeline, an air cap is installed on the top of the first oil and gas pipeline, a purification component is fixedly connected to the bottom of the air cap, a first residual oil anti-leakage valve is fixedly connected to the bottom of the first residual oil anti-leakage valve, a collecting component is provided along the bottom of the first residual oil anti-leakage valve, and through the above structure, the exhaust pipe The setting can convey the smoke exhausted from the oil production machine body to the inside of the connecting hose, the setting of the sealing component can prevent the smoke from leaking at the connection between the exhaust pipe, the connecting hose and the delivery pipe, the setting of the air cap can liquefy the smoke entering the first oil and gas pipeline, the first residual oil anti-leakage valve is used to control whether the liquefied residual oil is discharged, the setting of the anti-backflow component can reduce the residual oil from flowing back into the connecting hose and the exhaust pipe, the setting of the collecting component can collect the liquefied residual oil discharged by the first residual oil anti-leakage valve and the anti-backflow component, and the setting of the purification grip can filter and purify the smoke exhausted by the air cap, thereby reducing environmental pollution and reducing the influence of the residual oil reflux of the diesel engine crankcase ventilation device.

[0008] Preferably, the anti-backflow assembly includes a second oil and gas pipeline, which is evenly distributed on the side wall of the delivery pipe, and a second residual oil anti-leakage valve is fixedly connected to the end of each second oil and gas pipeline. Through the above structure, the second oil and gas pipeline and the second residual oil anti-leakage valve can guide the oil entering the interior of the delivery pipe to prevent the liquefied residual oil from flowing back into the connecting hose and the exhaust pipe and affecting the operation of the oil production machine body, further enhancing the anti-backflow effect of the liquefied residual oil of the diesel engine crank case ventilation device.

[0009] Preferably, the collecting assembly includes a collecting box, a cover plate is fixedly connected to the top of the collecting box, a docking ring is fixedly connected to the top of the cover plate, and a plurality of docking rings are provided, and the inner ring diameter of the docking ring is the same as the outer ring diameter of the discharge end of the first residual oil anti-leakage valve and the second residual oil anti-leakage valve. Through the above structure, the setting of the cover plate and the docking ring can dock the discharge ends of the first residual oil anti-leakage valve and the second residual oil anti-leakage valve, thereby reducing the leakage of liquefied residual discharge. The liquefied residual oil discharged from the first residual oil anti-leakage valve and the second residual oil anti-leakage valve can be collected through the collecting box, thereby further enhancing the liquefied residual oil collection effect of the diesel engine crankcase ventilation device.

[0010] Preferably, the purification component includes a mounting ring, an activated carbon layer is installed on the inner wall of the mounting ring, and the activated carbon layer is evenly distributed on the inner wall of the mounting ring. Through the above structure, the arrangement of the mounting ring and the activated carbon layer can filter and purify the gas discharged from the air cap, reduce environmental pollution, and further enhance the exhaust gas purification effect of the diesel engine crankcase breather device.

[0011] Preferably, the outer wall of the collecting box is fixed with a fixing plate, and the fixing plate is evenly distributed on the outer wall of the collecting box. A hydraulic rod is fixed with the top of the fixing plate, and a support plate is fixed with the end of the hydraulic rod, and an anti-skid component is fixed with the bottom of the support plate. Through the above structure, the arrangement of the hydraulic rod and the support plate can adjust the height of the collecting box, and the pulley installed at the bottom of the collecting box can be empty to prevent the pulley from being displaced when subjected to external force, so as to prevent the leakage of liquefied residual oil discharged from the first residual oil anti-leakage valve and the second residual oil anti-leakage valve, thereby further enhancing the collection stabilization effect of the diesel engine crankcase ventilation device.

[0012] Preferably, the sealing assembly includes a sealing gasket, which is fixedly connected to both ends of the connecting hose. Through the above structure, the setting of the sealing gasket can seal the pipes connected to the two ends of the connecting hose, reduce smoke leakage, and further enhance the smoke conveying sealing effect of the diesel engine crankcase ventilation device.

[0013] Preferably, the anti-skid component includes an anti-skid pad, which is evenly distributed on the bottom of the support plate. Through the above structure, the provision of the anti-skid pad can increase the friction resistance between the bottom of the support plate and the ground, reduce the slipping of the support plate due to the smooth ground when supporting, and further enhance the support and anti-skid effect of the diesel engine crankcase ventilation device.

[0014] Preferably, the side wall of the collection box is opened and closed with a through hole, and a metering plate is installed on the inner wall of the through hole. The metering plate is made of transparent material. Through the above structure, the setting of the metering plate can observe the collection situation inside the collection box, further enhancing the collection and observation effect of the diesel engine crankcase ventilation device.

[0015] The beneficial effects of the present invention are as follows: 1. The diesel engine crankcase ventilation device with residual oil discharge described in the present invention can transport the smoke exhausted from the oil production machine body to the inside of the connecting hose through the setting of the exhaust pipe, and can prevent the smoke from leaking at the connection between the exhaust pipe, the connecting hose and the delivery pipe through the setting of the sealing component, and can liquefy the smoke entering the first oil and gas pipeline through the setting of the air cap, and control whether the liquefied residual oil is discharged through the first residual oil anti-leakage valve, and can reduce the reflux of residual oil to the inside of the connecting hose and the exhaust pipe through the setting of the anti-backflow component, and can collect the liquefied residual oil discharged by the first residual oil anti-leakage valve and the anti-backflow component through the setting of the collecting component, and can filter and purify the smoke discharged by the air cap through the setting of the purification grip, so as to reduce environmental pollution and reduce the influence of the residual oil reflux of the diesel engine crankcase ventilation device.

[0016] 2. The diesel engine crankcase ventilation device with residual oil discharge described in the present invention can guide the oil entering the interior of the delivery pipe through the arrangement of the second oil and gas pipeline and the second residual oil anti-leakage valve, thereby preventing the liquefied residual oil from flowing back into the connecting hose and the exhaust pipe and affecting the operation of the oil production machine body, thereby further enhancing the liquefied residual oil anti-reflux effect of the diesel engine crankcase ventilation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a stereogram of the present invention; Figure 2 It is a side view of the present invention; Figure 3 Schematic diagram of the structure of the activated carbon layer in the present invention; Figure 4 It is a schematic diagram of the docking ring structure in the present invention; Figure 5 It is a schematic diagram of the structure of the anti-skid pad in the present invention.

[0018] Description of reference numerals: 1. Oil production machine body; 11. Exhaust pipe; 12. Connecting hose; 13. Delivery pipe; 14. First oil and gas pipeline; 15. Air cap; 16. First residual oil anti-leakage valve; 2. Second oil and gas pipeline; 21. Second residual oil anti-leakage valve; 3. Collection box; 31. Cover plate; 32. Docking ring; 4. Mounting ring; 41. Activated carbon layer; 5. Fixing plate; 51. Hydraulic rod; 52. Support plate; 6. Sealing pad; 7. Anti-slip pad; 8. Metering plate. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0020] like Figures 1 to 4As shown, the diesel engine crankcase ventilation device with residual oil discharge of the embodiment of the present invention comprises an oil production machine body 1, an exhaust pipe 11 is fixedly connected to the bottom side wall of the oil production machine body 1, the end of the exhaust pipe 11 is connected to a connecting hose 12, the end of the connecting hose 12 is fixedly installed with a delivery pipe 13, the side wall of the delivery pipe 13 is fixedly connected to an anti-backflow component, the side wall of the connecting hose 12 is fixedly connected to a sealing component, the end of the delivery pipe 13 is connected to a first oil and gas pipeline 14, an air cap 15 is installed at the top of the first oil and gas pipeline 14, the bottom of the air cap 15 is fixedly connected to a purification component, and the first A first residual oil anti-leakage valve 16 is fixedly connected to the bottom of the oil and gas pipeline 14, and a collecting component is arranged along the bottom of the first residual oil anti-leakage valve 16. When working, the oil smoke inside the oil extraction machine body 1 can be discharged and guided through the exhaust pipe 11, and the oil smoke can be transported to the first oil and gas pipeline 14 through the connecting hose 12 and the delivery pipe 13. The smoke leakage can be reduced by the sealing component, and the oil smoke is liquefied through the air cap 15. The liquefied residual oil can be guided through the first oil and gas pipeline 14, and the residual oil is discharged or not through the first residual oil anti-leakage valve 16. The backflow prevention component can reduce the residual oil from flowing back into the connecting hose 12 and the exhaust pipe 11. The residual oil discharged from the first residual oil anti-leakage valve 16 and the backflow prevention component can be collected by setting the collecting component. The gas discharged from the air cap 15 can be purified by the purification component. The smoke discharged from the oil extraction machine body 1 can be transported to the connecting hose 12 by setting the exhaust pipe 11. The smoke can be prevented from leaking at the connection of the exhaust pipe 11, the connecting hose 12 and the delivery pipe 13 by setting the sealing component. The setting can liquefy the flue gas entering the first oil and gas pipeline 14, and the first residual oil anti-leakage valve 16 is used to control whether the liquefied residual oil is discharged. The setting of the anti-reflux component can reduce the reflux of residual oil into the connecting hose 12 and the exhaust pipe 11, and the setting of the collecting component can collect the liquefied residual oil discharged by the first residual oil anti-leakage valve 16 and the anti-reflux component. The setting of the purification grip can filter and purify the flue gas discharged by the air cap 15, thereby reducing environmental pollution and reducing the influence of the reflux of residual oil on the diesel engine crankcase ventilation device.

[0021] like Figures 1 to 4As shown, the anti-backflow component includes a second oil and gas pipeline 2, and the second oil and gas pipeline 2 is evenly distributed on the side wall of the delivery pipe 13. A second residual oil anti-leakage valve 21 is fixedly connected to the end of each second oil and gas pipeline 2. During operation, the liquefied residual oil flowing into the interior of the delivery pipe 13 can be guided by the second oil and gas pipeline 2, and the discharge of the liquefied residual oil in the second oil and gas pipeline 2 can be controlled by the second residual oil anti-leakage valve 21. The liquefied residual oil is collected by the collecting component to reduce the reflux of the liquefied residual oil into the connecting hose 12 and the exhaust pipe 11, which affects the operation of the oil production machine body 1. The second oil and gas pipeline 2 and the second residual oil anti-leakage valve 21 can be set to guide the oil entering the interior of the delivery pipe 13 to avoid the reflux of the liquefied residual oil into the connecting hose 12 and the exhaust pipe 11, which affects the operation of the oil production machine body 1, and further enhance the anti-backflow effect of the liquefied residual oil of the diesel engine crankcase ventilation device.

[0022] like Figures 1 to 4 As shown, the collecting assembly includes a collecting box 3, a cover plate 31 is fixedly connected to the top of the collecting box 3, a docking ring 32 is fixedly connected to the top of the cover plate 31, a plurality of docking rings 32 are provided, and the inner diameter of the docking ring 32 is the same as the outer diameter of the discharge end of the first residual oil anti-leakage valve 16 and the second residual oil anti-leakage valve 21. When working, the liquefied residual oil discharged by the first residual oil anti-leakage valve 16 and the second residual oil anti-leakage valve 21 can be collected through the collecting box 3, and the first residual oil anti-leakage valve 16 can be cleaned by the arrangement of the cover plate 31 and the docking ring 32. It is docked with the output end of the second residual oil anti-leakage valve 21, and the collecting box 3 is sealed to prevent the leakage of the liquefied residual oil smell. The first residual oil anti-leakage valve 16 and the second residual oil anti-leakage valve 21 discharge ends can be docked through the setting of the cover plate 31 and the docking ring 32 to reduce the leakage of liquefied residual discharge. The liquefied residual oil discharged from the first residual oil anti-leakage valve 16 and the second residual oil anti-leakage valve 21 can be collected through the collecting box 3, further enhancing the liquefied residual oil collection effect of the diesel engine crankcase ventilation device.

[0023] like Figures 1 to 4 As shown, the purification component includes a mounting ring 4, and an activated carbon layer 41 is installed on the inner wall of the mounting ring 4. The activated carbon layer 41 is evenly distributed on the inner wall of the mounting ring 4. When working, the gas discharged from the air cap 15 can be filtered and purified through the activated carbon layer 41 evenly distributed on the inner side of the mounting ring 4, thereby reducing the environmental pollution of the gas discharged from the air cap 15. Through the arrangement of the mounting ring 4 and the activated carbon layer 41, the gas discharged from the air cap 15 can be filtered and purified, thereby reducing environmental pollution, thereby further enhancing the exhaust gas purification effect of the diesel engine crankcase breather device.

[0024] like Figures 1 to 5As shown, a fixing plate 5 is fixedly connected to the outer wall of the collecting box 3, and the fixing plates 5 are evenly distributed on the outer wall of the collecting box 3. A hydraulic rod 51 is fixedly connected to the top of the fixing plate 5, and a support plate 52 is fixedly connected to the end of the hydraulic rod 51. An anti-skid component is fixedly connected to the bottom of the support plate 52. During operation, the collecting box 3 can be emptied by using the support plate 52 through the hydraulic rod 51 and the docking ring 32 can be docked with the discharge ends of the first residual oil anti-leakage valve 16 and the second residual oil anti-leakage valve 21, thereby reducing the pulley installed at the bottom of the collecting box 3 from being subjected to external forces when collecting liquefied residual oil, resulting in movement and deviation of the collecting box 3. The height of the collecting box 3 can be adjusted by setting the hydraulic rod 51 and the support plate 52, and the pulley installed at the bottom of the collecting box 3 can be emptied to avoid displacement of the pulley when subjected to external forces, thereby preventing the liquefied residual oil discharged from the first residual oil anti-leakage valve 16 and the second residual oil anti-leakage valve 21 from leaking, thereby further enhancing the collection and stabilization effect of the diesel engine crankcase ventilation device.

[0025] like Figure 1 to Figure 2 As shown, the sealing assembly includes a sealing gasket 6, which is fixedly connected to both ends of the connecting hose 12. When working, it can reduce the leakage of smoke when the pipeline connected at both ends of the delivery pipe 13 is transporting smoke, which affects the subsequent residual oil release process. Through the setting of the sealing gasket 6, the pipeline connected at both ends of the connecting hose 12 can be sealed to reduce smoke leakage, further enhancing the smoke transportation sealing effect of the diesel engine crankcase ventilation device.

[0026] like Figures 1 to 5 As shown, the anti-skid component includes an anti-skid pad 7, which is evenly distributed on the bottom of the support plate 52. When working, the anti-skid pad 7 evenly distributed on the bottom of the support plate 52 can increase the friction between the bottom of the support plate 52 and the ground, thereby avoiding slipping when the support plate 52 is supported. The provision of the anti-skid pad 7 can increase the friction resistance between the bottom of the support plate 52 and the ground, thereby reducing the slipping of the support plate 52 due to the smooth ground when the support plate 52 is supported, thereby further enhancing the support and anti-skid effect of the diesel engine crankcase ventilation device.

[0027] like Figures 1 to 4 As shown, the side wall of the collecting box 3 is opened and closed with a through hole, and the inner wall of the through hole is installed with a metering plate 8, which is made of transparent material. When working, the collection situation of the liquefied residual oil inside the collecting box 3 can be observed intuitively through the capacity scale engraved on the side wall of the metering plate 8. The collection situation inside the collecting box 3 can be observed through the setting of the metering plate 8, which further enhances the collection and observation effect of the diesel engine crankcase ventilation device.

[0028] During operation, the oil smoke inside the oil extraction machine body 1 can be discharged and guided through the exhaust pipe 11, the oil smoke can be transported to the first oil and gas pipeline 14 through the connecting hose 12 and the delivery pipe 13, the smoke leakage can be reduced through the sealing component, the oil smoke is liquefied through the air cap 15, the liquefied residual oil can be guided through the first oil and gas pipeline 14, the first residual oil anti-leakage valve 16 is used to control whether the residual oil is discharged, the backflow prevention component can reduce the residual oil from flowing back to the connecting hose 12 and the exhaust pipe 11, and the first residual oil anti-leakage valve 16 can be set to prevent the residual oil from flowing back to the connecting hose 12 and the exhaust pipe 11. 6 and the residual oil discharged from the anti-backflow assembly, the gas discharged from the air cap 15 can be purified by the purification assembly, the liquefied residual oil flowing into the inside of the delivery pipe 13 can be guided by the second oil and gas pipeline 2, the discharge of the liquefied residual oil in the second oil and gas pipeline 2 can be controlled by the second residual oil anti-leakage valve 21, and the liquefied residual oil in the second oil and gas pipeline 2 can be collected by the collecting assembly to reduce the liquefied residual oil from flowing back into the connecting hose 12 and the exhaust pipe 11, which affects the operation of the oil production machine body 1, and the first residual oil anti-leakage valve 16 and the second residual oil anti-leakage valve 21 can be controlled by the collecting box 3. The discharged liquefied residual oil is collected, and the output ends of the first residual oil anti-leakage valve 16 and the second residual oil anti-leakage valve 21 can be docked by setting the cover plate 31 and the docking ring 32, and the collecting box 3 is capped to prevent the liquefied residual oil smell from leaking out. The activated carbon layer 41 evenly distributed on the inner side of the mounting ring 4 can filter and purify the gas discharged from the air cap 15 to reduce the environmental pollution of the gas discharged from the air cap 15. The collecting box 3 can be emptied by using the support plate 52 through the hydraulic rod 51 and the docking ring 32 can be connected to the first residual oil anti-leakage valve 16 and the second residual oil anti-leakage valve 2 1 The discharge end is butted against each other to reduce the external force on the pulley installed at the bottom of the collecting box 3 when collecting the liquefied residual oil, which may cause the collecting box 3 to move and deviate. At the same time, it can reduce the leakage of the pipes that are butted against each other at both ends of the conveying pipe 13 when conveying smoke, which may affect the subsequent residual oil discharge process. The anti-skid pads 7 evenly distributed at the bottom of the supporting plate 52 can increase the friction between the bottom of the supporting plate 52 and the ground, avoiding the support plate 52 from slipping when supporting. The capacity scale is engraved on the side wall of the metering plate 8, so that the collection of the liquefied residual oil inside the collecting box 3 can be intuitively observed.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A diesel engine crankcase venting device with residual oil discharge, comprising an oil extraction machine body (1), characterized in that: An exhaust pipe (11) is fixedly connected to the side wall at the bottom of the oil extraction machine body (1), the end of the exhaust pipe (11) is connected to a connecting hose (12), the end of the connecting hose (12) is fixedly installed with a delivery pipe (13), the side wall of the delivery pipe (13) is fixedly connected to an anti-backflow component, the side wall of the connecting hose (12) is fixedly connected to a sealing component, the end of the delivery pipe (13) is connected to a first oil and gas pipeline (14), the top of the first oil and gas pipeline (14) is installed with an air cap (15), the bottom of the air cap (15) is fixedly connected to a purification component, the bottom of the first oil and gas pipeline (14) is fixedly connected to a first residual oil anti-leakage valve (16), and a collection component is provided along the bottom of the first residual oil anti-leakage valve (16).

2. The diesel engine crankcase venting device with residual oil discharge according to claim 1, characterized in that: The backflow prevention assembly comprises second oil and gas pipelines (2), the second oil and gas pipelines (2) being evenly distributed on the side wall of the delivery pipe (13), and a second residual oil anti-leakage valve (21) being fixedly connected to the end of each second oil and gas pipeline (2).

3. The diesel engine crankcase venting device with residual oil discharge according to claim 1, characterized in that: The collecting assembly comprises a collecting box (3), a cover plate (31) being fixedly connected to the top of the collecting box (3), a docking ring (32) being fixedly connected to the top of the cover plate (31), a plurality of docking rings (32) being provided, and an inner ring diameter of the docking ring (32) being the same as an outer ring diameter of a discharge end of a first residual oil anti-leakage valve (16) and a second residual oil anti-leakage valve (21).

4. The diesel engine crankcase venting device with residual oil discharge according to claim 1, characterized in that: The purification component comprises a mounting ring (4), an activated carbon layer (41) being mounted on the inner side wall of the mounting ring (4), and the activated carbon layer (41) being evenly distributed on the inner side wall of the mounting ring (4).

5. The diesel engine crankcase venting device with residual oil discharge according to claim 3, characterized in that: The outer wall of the collection box (3) is fixedly connected to a fixing plate (5), the fixing plates (5) are evenly distributed on the outer wall of the collection box (3), the top of the fixing plate (5) is fixedly connected to a hydraulic rod (51), the end of the hydraulic rod (51) is fixedly connected to a support plate (52), and the bottom of the support plate (52) is fixedly connected to an anti-skid component.

6. The diesel engine crankcase venting device with residual oil discharge according to claim 1, characterized in that: The sealing assembly comprises a sealing gasket (6), and the sealing gasket (6) is fixedly connected to both ends of the connecting hose (12).

7. The diesel engine crankcase venting device with residual oil discharge according to claim 5, characterized in that: The anti-skid assembly comprises an anti-skid pad (7), and the anti-skid pad (7) is evenly distributed on the bottom of the support plate (52).

8. The diesel engine crankcase venting device with residual oil discharge according to claim 3, characterized in that: The side wall of the collection box (3) is provided with a through hole, and a metering plate (8) is installed on the inner side wall of the through hole. The metering plate (8) is made of a transparent material.

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