JP2013036432A - Dew condensation preventive device inside ventilator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of dew condensation water inside a ventilator.SOLUTION: A dew condensation preventive device includes a temperature-raising pit 24 which accommodates a lower section of a ventilator 1, and is provided with a heating wire 26 (a metal resistor) which generates the heat by the conduction, and a temperature-raising cap 25 which covers an upper section of the ventilator 1 and is provided with a heating wire 27 (a metal resistor) which generates the heat by the conduction. The current can be applied to the heating wires 26, 27 of the temperature-raising pit 24 and the temperature-raising cap 25, respectively.

Description

  The present invention relates to an apparatus for preventing dew condensation from occurring inside a ventilator that captures and removes oil from blow-by gas of an engine.

  The blow-by gas that leaks from the combustion chamber into the crankcase during the compression / combustion stroke of the engine may increase the internal pressure of the crankcase and damage the gas seal. Although it is necessary to do this, blow-by gas contains mist-like oil, which can cause air pollution, so the oil is trapped and removed through the ventilator without opening it to the atmosphere, and then returned to the intake system for recycling. I try to burn it.

  As shown in FIG. 4, blow-by gas from the crankcase 4 of the operating engine is introduced into the blow-by gas inlet 3 of the main body 2 constituting the ventilator 1. The blow-by gas introduced into the main body 2 from the inlet 3 swirls in the ring-shaped first chamber 5 and flows into the second chamber 7 from the hole 6. A relatively large drop of oil in the blow-by gas is captured by the metal filter net 8 made of steel mesh while swirling in the two chambers 7, and then from the hole 9 to the upper space 10a of the third chamber 10. It is designed to flow in.

  The blow-by gas that has flowed into the upper space 10a of the third chamber 10 rises through the central passage 12 above the PCV valve 11 (diaphragm valve), flows into the fourth chamber 13, and flows into the fourth chamber 13. The blowby gas flows from the hollow portion of the element 14 toward the space 13a outside the element 14, and oil of relatively small droplets is also captured by the element 14, so that the oil in the space 13a from which the oil has been removed is captured. The blow-by gas is discharged from the blow-by gas outlet 15 and returned to the upstream portion of the turbocharger 16.

  The oil trapped in the element 14 and formed into droplets flows down to the space 13a and is collected in the oil collecting portion 17, and when a predetermined amount or more of oil is accumulated in the oil collecting portion 17, the check valve 18 opens, Is made to flow down to an oil passage 19 a provided in the protruding portion 19.

  Further, the oil trapped by the filter mesh 8 in the second chamber 7 flows down from the hole 9, flows down through the upper part of the diaphragm of the PCV valve 11, and joins the oil captured by the element 14. Thus, it is stored in the oil storage section 20 at the bottom.

  When oil accumulates in the oil reservoir 20 over a predetermined amount, the check valve 21 opens, the oil flows down to the oil outlet 22 and is returned to the crankcase 4 through the oil return passage 23 (drain hose). It is like that.

  As prior art document information related to this type of ventilator, there is Patent Document 1 below.

JP 2007-247552 A

  However, when the high temperature blow-by gas passes through the ventilator 1 when the surface temperature inside the ventilator 1 is lowered, moisture contained in the blow-by gas is condensed, and the condensed water is supplied to the oil reservoir 20 and the like. Therefore, when the main body 2 is cooled by the cold outside air temperature or the blowing of cold air, the water stored in the oil storage unit 20 is frozen and the oil in the oil storage unit 20 cannot be taken out. Or the passage of the blow-by gas in the main body 2 may be blocked to increase the pressure in the crankcase 4 and induce oil leakage.

  For this reason, in Patent Document 1 and the like, a proposal has been made for covering the ventilator 1 with a heat insulating material to prevent freezing of the condensed water that has already occurred. Even so, if the engine was stopped and left for a long time in cold weather, it was inevitable that the condensed water would freeze.

  This invention is made | formed in view of the said situation, and it aims at preventing generation | occurrence | production of the dew condensation water inside a ventilator.

  The present invention is an apparatus for preventing dew condensation from occurring inside a ventilator that introduces blow-by gas of an engine and captures and removes oil from the blow-by gas. The metal resistance accommodates the lower part of the ventilator and generates heat when energized. A temperature rising pit provided with a body, and a temperature rising cap provided with a metal resistor that covers the top of the ventilator and generates heat when energized, and current to each of the metal resistors of the temperature rising pit and the temperature rising cap It is characterized in that it can be applied.

  Thus, the lower part of the ventilator is accommodated in the temperature rising pit, and the upper part of the ventilator is covered with a temperature rising cap, and when a current is applied to each of the metal resistors of the temperature rising pit and the temperature rising cap, Each of the metal resistors generates heat when energized, the temperature rising pit and the temperature rising cap are heated, and the lower and upper portions of the ventilator are heated from the outside to increase the surface temperature inside the ventilator. The temperature difference from the internal ambient temperature is eliminated and the generation of condensed water is prevented.

  Further, in the present invention, it is preferable that the inlet side pipe for introducing the blow-by gas to the ventilator is also provided with a metal resistor that generates heat when energized, and that a current can be applied to the metal resistor. In this case, when a current is applied to the metal resistor of the inlet side piping of the blowby gas, the metal resistor generates heat by energization, the temperature of the inlet side pipe rises, and the temperature of the blowby gas led to the ventilator increases. Further, since the blow-by gas does not easily reach the dew point in the ventilator, the generation of condensed water is further prevented, and at the same time, the generation of condensed water in the inlet side pipe is also prevented.

  Furthermore, in carrying out the present invention more specifically, it is preferable that the temperature rising pit and the temperature rising cap are formed of silicon rubber and a heating wire is embedded as a metal resistor inside the silicon rubber. As an example, a ribbon-like heater containing a heating wire may be wound around the blow-by gas inlet side pipe.

  According to the dew condensation preventing device inside the ventilator of the present invention described above, various excellent effects as described below can be obtained.

  (I) The temperature of the temperature rise pit and the temperature rise cap is raised by energizing the respective metal resistors of the temperature rise pit and the temperature rise cap, thereby warming the lower and upper portions of the ventilator from the outside, thereby increasing the surface temperature inside the ventilator. Therefore, the temperature difference between the surface temperature inside the ventilator and the internal atmosphere temperature can be eliminated to prevent the formation of condensed water inside the ventilator. As a result, the condensed water freezes when it is cold. This makes it possible to avoid the inability to take out oil and blockage of the blow-by gas path.

  (II) Since it can be implemented simply by attaching a temperature rising pit and a temperature rising cap to an existing ventilator later, the generation of condensed water inside the ventilator can be prevented only by making a simple improvement to the existing equipment. .

  (III) In the case where the inlet side pipe that guides the blow-by gas to the ventilator is also provided with a metal resistor that generates heat when energized, and the current can be applied to the metal resistor, the metal resistance of the inlet side pipe By energizing the body, the temperature of the inlet pipe can be raised, thereby increasing the temperature of the blow-by gas guided to the ventilator, so that it is difficult for the blow-by gas to reach the dew point in the ventilator. Generation | occurrence | production prevention can be aimed at and generation | occurrence | production of the dew condensation water in the said entrance side piping can also be prevented.

It is a perspective view which shows an example of the form which implements this invention. It is an external view of the ventilator of FIG. It is a top view which shows the inlet side piping which guides blowby gas to the ventilator of FIG. It is sectional drawing which shows an example of a general ventilator.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 3 show an example of an embodiment for carrying out the present invention, and the portions denoted by the same reference numerals as those in FIG. 4 represent the same items.

  As shown in FIG. 1, the dew condensation prevention device inside the ventilator according to this embodiment includes a temperature rising pit 24 that is attached to the lower part (ventilator body) of the ventilator 1 from below and accommodates the lower part, and the upper part of the ventilator 1 (ventilator cap). ) And the temperature rising pit 24 and the temperature rising cap 25 are formed of silicon rubber, and heating wires 26 and 27 are formed inside the silicon rubber. (Metal resistor that generates heat when energized) is embedded and embedded in a zigzag pattern so as to cover the whole, and an external power source or a built-in battery (not shown) via harnesses 28 and 29 drawn to the outside For example, a current can be applied.

  The appearance of the ventilator 1 to which the temperature raising pit 24 and the temperature raising cap 25 shown in FIG. 1 are mounted is as shown in FIG. 2, and in the case of the example shown here, it can be seen from the front in FIG. The blow-by gas inlet 3 and the blow-by gas outlet 15 projecting from the main body of the ventilator 1 are directed toward the mounting surface A (surface to be mounted on the engine side) toward the opening 30 on one side surface of the temperature rising pit 24 having a bowl shape shown in FIG. 1 is extended to the outside of the temperature raising pit 24 using notches 31 and 32 on other side surfaces adjacent to the opening 30. The temperature raising cap 25 in FIG. 1 is formed so as to form a frustoconical shape so that it can be easily covered from above, and its inner side surface is formed so as to correspond to the shape of the upper part of the ventilator 1.

  Further, as shown in a plan view in FIG. 3, in this embodiment, a ribbon including a heating wire 34 (a metal resistor that generates heat when energized) is also provided around the inlet side pipe 33 that guides the blow-by gas to the ventilator 1. A heater 35 is wound around, and a current can be applied from an external power source or a mounted battery (not shown) via a harness 36 drawn to the outside.

  Thus, the lower portion of the ventilator 1 is accommodated in the temperature raising pit 24 and the upper portion of the ventilator 1 is covered with the temperature raising cap 25 to cover the heating wires 26 of the temperature raising pit 24 and the temperature raising cap 25, respectively. When a current is applied to the power supply 27 via the harnesses 28 and 29, the heating wires 26 and 27 generate heat when energized, and the temperature raising pit 24 and the temperature raising cap 25 rise in temperature, and the lower and upper portions of the ventilator 1 are heated. Is heated from the outside, the surface temperature inside the ventilator 1 rises, the temperature difference between the surface temperature inside the ventilator 1 and the internal atmosphere temperature disappears, and the generation of condensed water is prevented.

  Further, when a current is applied to the heating wire 34 of the inlet side pipe 33 of the blowby gas, the heating wire 34 generates heat by energization, the inlet side pipe 33 is heated, and the temperature of the blowby gas guided to the ventilator 1 is increased. As a result, the blow-by gas does not easily reach the dew point in the ventilator 1, so that the generation of condensed water is further prevented, and at the same time, the generation of condensed water in the inlet side pipe 33 is also prevented.

  Here, energization of the heating wires 26, 27, and 34 of the heating pit 24, the heating cap 25, and the ribbon heater 35 can be performed regardless of whether the engine is started or not. When energization is performed later, it is preferable to use an external power supply. In this way, it is possible to avoid the consumption of the on-board battery.

  As described above, according to the above-described embodiment, the temperature rise pit 24 and the temperature rise cap 25 are heated by energizing the heating wires 26 and 27 of the temperature rise pit 24 and the temperature rise cap 25, respectively. As a result, the lower and upper portions of the ventilator 1 can be warmed from the outside to increase the surface temperature inside the ventilator 1, so that there is no temperature difference between the surface temperature inside the ventilator 1 and the internal atmosphere temperature, and the dew condensation water inside the ventilator 1 Generation | occurrence | production can be prevented and, as a result, obstruction | occlusion of the oil by the dew condensation water freezing at the time of a cold and obstruction | occlusion of the path | route of blow-by gas can be avoided beforehand.

  Moreover, since it can implement only by attaching the temperature rising pit 24 and the temperature rising cap 25 later with respect to the existing ventilator 1, generation | occurrence | production of the dew condensation water within the ventilator 1 is prevented only by giving a simple improvement with respect to the existing equipment. be able to.

  Further, particularly in this embodiment, the inlet side pipe 33 is heated by energizing the heating wire 34 of the ribbon heater 35 wound around the inlet side pipe 33 that guides the blow-by gas, and is thereby led to the ventilator 1. Since the temperature of the blow-by gas can be raised, it is difficult for the blow-by gas to reach the dew point in the ventilator 1, and it is possible to prevent further generation of condensed water, and the condensed water in the inlet side pipe 33. Can also be prevented.

  It should be noted that the dew condensation prevention device inside the ventilator of the present invention is not limited to the above-described embodiment, the temperature rising pit and the temperature rising cap are not limited to the shapes shown in the figure, and the metal resistor is other than the heating wire The heating wire may be affixed to the surface of the temperature rising pit and the temperature raising cap as a metal resistor. Of course, it is possible to embed a heat ray, and other various modifications can be made without departing from the scope of the present invention.

1 Ventilator 24 Heating Pit 25 Heating Cap 26 Heating Wire (Metal Resistor)
27 Heating wire (metal resistor)
33 Inlet piping 34 Heating wire (metal resistor)
35 Ribbon heater

Claims (4)

  An apparatus for preventing condensation from being generated inside a ventilator that introduces engine blow-by gas and captures and removes oil from the blow-by gas, and includes a metal resistor that houses the lower part of the ventilator and generates heat when energized. A temperature rising pit and a temperature rising cap provided with a metal resistor that covers the top of the ventilator and generates heat when energized, and current can be applied to each of the metal resistors of the temperature rising pit and the temperature rising cap. Condensation prevention device inside the ventilator, characterized by being configured as described above.   2. The ventilator according to claim 1, further comprising a metal resistor that generates heat when energized in an inlet side pipe that guides the blow-by gas to the ventilator, so that a current can be applied to the metal resistor. Anti-condensation device.   3. The dew condensation prevention apparatus inside a ventilator according to claim 1, wherein the temperature raising pit and the temperature raising cap are formed of silicon rubber, and a heating wire is embedded in the silicon rubber as a metal resistor.   The dew condensation prevention device inside a ventilator according to claim 1, 2 or 3, wherein a ribbon-like heater containing a heating wire as a metal resistor is wound around the outer periphery of the blow-by gas inlet side piping.

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