JP2005220808A - Blowby-gas treatment device in internal combustion engine for air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blowby gas treatment device appropriate for an internal combustion engine for an air conditioner in which blowby gas can be efficiently heated, necessity for maintenance check is reduced, and start and stop are automatically controlled. <P>SOLUTION: A cylindrical case 19 is provided around the outside periphery 181 of a muffler 18. The cylindrical case 19 comprises a cylindrical wall 191 and a top-end wall 192 and a bottom-end wall 193. The cylindrical case 19 covers around the outside periphery 181 of the muffler 18, and the inside of the cylindrical case 19 constitutes an oil-separation space 20. One end of a hose 21 is connected to a head cover 12, and the other end of the hose 21 is connected to the lower part of the cylindrical wall 191 of the cylindrical case 19. One end of the hose 22 is connected to the top-end wall 192 of the cylindrical case 19, and the other end of the hose 22 is connected to an intake pipe 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a blow-by gas processing apparatus in an internal combustion engine for an air conditioning apparatus in which blow-by gas generated in the internal combustion engine is caused to flow into an intake system and an air conditioning apparatus is driven by operation of the internal combustion engine.

  Patent Documents 1 and 2 disclose means for heating blow-by gas in order to prevent generation of sludge due to a reaction between an additive in engine oil contained in blow-by gas and moisture in blow-by gas. In the blow-by gas reduction device disclosed in Patent Document 1, the lubricant oil is separated from the blow-by gas in the engine head cover, and the blow-by gas sent from the engine head cover to the intake passage is heated by the heat of the exhaust gas.

  In the oil separator disclosed in Patent Document 2, an oil separator chamber is independently formed in the casing of the exhaust silencer, and the oil separator element is accommodated in the oil separator chamber. The blow-by gas passing through the oil separator element is heated by the heat transmitted from the exhaust silencer.

In the blow-by gas processing apparatus disclosed in Patent Document 3, a blow-by gas reduction chamber is provided in an air cleaner, and a muffler is disposed in the vicinity of the air cleaner. The reduction chamber is heated by the residual heat of the muffler.
Japanese Utility Model Publication 4-49617 JP-A-8-14605 JP 11-36841 A

  However, in the apparatus disclosed in Patent Document 3, merely placing the muffler in the vicinity of the reduction chamber of the air cleaner makes it difficult to transfer the remaining heat of the muffler to the reduction chamber in the air cleaner, and the reduction chamber cannot be effectively heated.

  In the apparatus disclosed in Patent Document 1, exhaust gas is guided around the intake path, and the blow-by gas in the intake path is heated by the heat of the exhaust gas guided around the intake path. Therefore, the apparatus disclosed in Patent Document 3 is disclosed. The blow-by gas can be heated more effectively.

  However, since the volume of the breather chamber disposed in the engine head cover is limited by the size or shape of the engine head cover itself, the ability to separate lubricating oil from blow-by gas is also limited. In general, an internal combustion engine for an air conditioner is required to have a longer operation time per operation and a longer inspection / maintenance interval than an internal combustion engine for an automobile. Even if the lubricating oil mixed in the blow-by gas does not become a problem in an internal combustion engine for automobiles, the internal combustion engine for an air conditioner gradually deposits and adheres to the intake valve of the engine over a long operating time. There is a risk of poor compression due to poor sealing performance of the intake valve during the compression stroke.

  The apparatus disclosed in Patent Document 2 does not cause the problem as in Patent Document 1, but it is necessary to inspect and maintain the oil separator element. In addition, since a bulky oil separator element (filter) is used, it is necessary to enlarge a dedicated space for disposing the oil separator element.

  INDUSTRIAL APPLICABILITY The present invention is a blow-by gas processing device that can effectively heat blow-by gas and requires little maintenance, and is suitable for an internal combustion engine for an air conditioning device that is automatically controlled to start and stop. An object is to provide a blow-by gas processing apparatus.

  To this end, the present invention is directed to a blow-by gas processing device in an internal combustion engine for an air conditioner that flows blow-by gas generated in the internal combustion engine into an intake system and drives the air conditioner by operation of the internal combustion engine. In the present invention, a blow-by gas flow path for flowing blow-by gas generated in the internal combustion engine to an intake system, an exhaust flow path for discharging exhaust gas generated in the internal combustion engine, and a muffler that is a part of the exhaust flow path An oil separation space that is part of the blow-by gas flow path and is in contact with the outer surface of the muffler, and an oil reflux flow for taking out the oil separated from the blow-by gas in the oil separation space from the oil separation space The blow-by gas processing apparatus provided with the path was comprised.

  Since the oil separation space is brought into contact with the outer surface of the muffler, the blow-by gas can be effectively heated by the heat of the exhaust gas. If the oil taken out to the oil recirculation flow path is not returned to the intake valve side of the engine, the lubricating oil is less deposited and adheres to the intake valve of the engine, and engine compression failure is prevented. Since oil separation is performed in the oil separation space without using a filter, inspection and maintenance that considers clogging of the filter with oil is unnecessary.

  According to a second aspect of the present invention, in the first aspect, the muffler is formed in a cylindrical shape, and the oil separation space is configured by an outer peripheral surface of the cylindrical muffler and a cylindrical case that covers the outer peripheral surface.

The configuration in which the outer peripheral surface of the muffler is covered with the cylindrical case is effective in increasing the heating efficiency in the oil separation space and ensuring a sufficient volume for oil separation.
According to a third aspect of the present invention, in the second aspect, an oil pan is disposed immediately below the engine cylinder, the oil recirculation flow path is connected to the bottom of the oil separation space, and separated from the blow-by gas in the oil separation space. The oil thus obtained was refluxed to the oil pan via the oil reflux channel.

  The oil separated from the blow-by gas in the oil separation space is returned to the oil pan via the oil recirculation flow path, so that the lubricating oil is less deposited and adheres to the engine intake valve, and the engine compression is reduced. Defects are prevented.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the blow-by gas passage upstream of the oil separation space is connected to a lower portion of the oil separation space, and the oil separation space The downstream blowby gas passage is connected to the upper portion of the oil separation space, and the oil return passage is connected to the oil separation space at a position lower than the connection position of the upstream blowby gas passage to the oil separation space. did.

  The blow-by gas that has flowed into the oil separation space from the blow-by gas passage is directed upward, and the oil separated from the blow-by gas falls downward due to the gravity action.

  INDUSTRIAL APPLICABILITY The present invention is a blow-by gas processing device that can effectively heat blow-by gas and requires little maintenance, and is suitable for an internal combustion engine for an air conditioning device that is automatically controlled to start and stop. There is an excellent effect that a blow-by gas processing apparatus can be provided.

A first embodiment embodying the present invention will be described below with reference to FIGS. 1 (a) and 1 (b).
FIG. 1A shows an internal combustion engine 10 that is a drive source of an air conditioning device 26, a so-called gas heat pump. A head cover 12 is attached to a cylinder head 11 connected to an engine cylinder block 101 containing a plurality of pistons (not shown). An oil pan 24 is attached to the lower part of the engine cylinder block 101. An intake pipe 13 is connected to the cylinder head 11, and an air cleaner 14 is connected to the intake pipe 13. A fuel supply pipe 15 for supplying fuel is connected to the intake pipe 13 serving as an intake system. The fuel used is LP gas or city gas, and the output shaft of the internal combustion engine 10 drives the compressor 25.

  An exhaust pipe 16 is connected to the cylinder head 11. A heat exchanger 17 and a cylindrical muffler 18 are interposed in the middle of the exhaust pipe 16 serving as an exhaust passage. A cylindrical case 19 is attached to the outer peripheral surface 181 of the muffler 18 serving as an exhaust passage. The cylindrical case 19 includes a cylindrical wall 191, an upper end wall 192, and a lower end wall 193. The cylindrical case 19 surrounds and covers the outer peripheral surface 181 of the muffler 18, and the inside of the cylindrical case 19 is an oil separation space 20. The oil separation space 20 includes an outer peripheral surface 181 of the muffler 18 and a cylindrical case 19 that covers the outer peripheral surface 181.

  One end of a hose 21 is connected to the head cover 12. The other end of the hose 21 is connected to the lower part of the cylindrical wall 191 of the cylindrical case 19. One end of the hose 22 is connected to the upper end wall 192 of the cylindrical case 19, and the other end of the hose 22 is connected to the intake pipe 13. The hose 21 connected to the lower part of the oil separation space 20 is a blow-by gas flow path upstream of the oil separation space 20, and the hose 22 connected to the upper part of the oil separation space 20 is downstream of the oil separation space 20. This is a blowby gas flow path.

  One end of a reflux pipe 23 serving as an oil reflux channel is connected to the lower end wall 193 of the cylindrical case 19, and the other end of the reflux pipe 23 is connected to an oil pan 24. The muffler 18 is above the oil pan 24, and the connection portion between the return pipe 23 and the lower end wall 193 is above the connection portion between the return pipe 23 and the oil pan 24. The connecting portion between the hose 21 and the cylindrical wall 191 is above the connecting portion between the reflux pipe 23 and the lower end wall 193, and the connecting portion between the hose 22 and the upper end wall 192 is a connection between the hose 21 and the cylindrical wall 191. It is above the part.

  When the engine is operating, blow-by gas is generated in the cylinder head 11. This blow-by gas flows into the oil separation space 20 in the cylindrical case 19 via the head cover 12 and the hose 21. The mist-like lubricating oil contained in the blow-by gas flowing into the wide oil separation space 20 from the hose 21 having a small passage cross-sectional area is separated in the oil separation space 20. The separated lubricating oil falls on the lower end wall 193 due to gravity and returns to the oil pan 24 through the reflux pipe 23. The blow-by gas in the oil separation space 20 flows out into the intake pipe 13 via the hose 22. The blow-by gas that has flowed into the intake pipe 13 is sent to the engine together with the intake air flowing through the intake pipe 13 and recombusted.

  The exhaust gas is discharged to the atmosphere via the exhaust pipe 16, the heat exchanger 17, and the muffler 18. The heat exchanger 17 heats water for heating the refrigerant flowing in the air conditioner 26 by the heat of the exhaust gas.

In the first embodiment, the following effects can be obtained.
(1-1) The outer peripheral surface 181 of the muffler 18 is a part of the wall surface forming the oil separation space 20, and the oil separation space 20 is in contact with the outer surface of the muffler 18. Therefore, the blow-by gas in the oil separation space 20 can be effectively heated by the heat of the exhaust gas that passes through the muffler 18. As a result, it is possible to prevent the generation of sludge due to the reaction between the additive in the lubricating oil contained in the blow-by gas and the moisture in the blow-by gas.

  (1-2) By utilizing the outer periphery of the muffler 18, it is possible to secure a large volume for lubricating oil separation as compared with the case where the cylinder head is used. As a result, it is possible to increase the lubricating oil separation capability, and it is possible to reduce the lubricating oil flowing to the intake side. As a result, the lubricating oil is reduced to adhere to the intake valve of the engine, and the engine compression failure is prevented. That is, it is suitable for an internal combustion engine for an air conditioner in which the operation time per operation is long and the inspection / maintenance interval is set to be long.

  (1-3) Since oil is separated in the oil separation space 20 without using a filter, it is not necessary to perform inspection and maintenance in consideration of clogging of the filter with oil. That is, in the blow-by gas processing apparatus of this embodiment, there is little necessity for maintenance inspection.

  (1-4) Since the connection location between the hose 21 upstream of the oil separation space 20 and the oil separation space 20 is higher than the connection location between the oil separation space 20 and the reflux pipe 23, it falls on the lower end wall 193. The lubricated oil does not flow into the hose 21 side. That is, the lubricating oil separated in the oil separation space 20 is prevented from returning to the head cover 12 side via the hose 21, and the lubricating oil separated in the oil separation space 20 does not return to the intake valve side. Ensure reflux to pan 24.

Next, each embodiment of FIG.2, FIG3 and FIG.4 is demonstrated. In each embodiment, the same reference numerals are used for the same components as those in the first embodiment.
A cylindrical case 19 </ b> A in the second embodiment of FIG. 2 covers the outer peripheral surface 181 and the upper end surface 182 of the muffler 18. That is, the oil separation space 20 </ b> A in the cylindrical case 19 </ b> A is in contact with the outer peripheral surface 181 and the upper end surface 182 of the muffler 18. In the second embodiment, the efficiency of heating the blow-by gas by the heat of the exhaust gas is further higher than in the case of the first embodiment.

  The cylindrical case 19B in the third embodiment of FIG. 3 covers only a part of the outer peripheral surface 181 of the muffler 18. In the third embodiment, the efficiency of heating the blow-by gas by the heat of the exhaust gas is lower than in the case of the first embodiment, but the same effects as in the case of the first embodiment are obtained except for this. .

  In the fourth embodiment of FIG. 4, a partition plate 27 is provided in the cylindrical case 19. The partition plate 27 is provided with a plurality of flow holes 271. The passage sectional area in the flow hole 271 is smaller than the passage sectional area in the hose 21. The partition plate 27 partitions the oil separation spaces 20 </ b> C and 20 </ b> D in the cylindrical case 19 above the connection portion between the hose 21 and the cylindrical wall 191 of the cylindrical case 19. The blow-by gas that has flowed into the oil separation space 20C from the hose 21 flows out to the hose 22 via the flow hole 271 and the oil separation space 20D.

  The blow-by gas that has flowed into the oil separation space 20C is separated from the oil in the oil separation space 20C, and the blow-by gas that has flowed into the oil separation space 20D through the flow holes 271 is separated from the oil. The lubricating oil separated in the oil separation space 20D passes through the flow hole 271 and falls to the oil separation space 20C side.

  Also in the fourth embodiment, the same effect as in the first embodiment can be obtained.

1 shows a first embodiment, (a) is a side sectional view. (B) is the sectional view on the AA line of (a). The principal part side sectional view showing a 2nd embodiment. The principal part sectional side view which shows 3rd Embodiment. The principal part sectional side view which shows 4th Embodiment.

Explanation of symbols

  10: Internal combustion engine. 13 ... Intake pipe as intake system. 16: Exhaust pipe that serves as an exhaust passage. 18 ... Muffler. 181 ... An outer peripheral surface which is an outer surface of the muffler. 19, 19A, 19B ... cylindrical case. 20, 20A, 20C, 20D ... oil separation space. 21 A hose that is an upstream blow-by gas passage. 22 A hose that is a blow-by gas passage downstream. 23: A reflux pipe as an oil reflux channel. 24 ... Oil pan. 26: Air conditioning device.

Claims (4)

In a blow-by gas processing apparatus in an internal combustion engine for an air conditioner that flows blow-by gas generated in the internal combustion engine into an intake system and drives an air conditioner by operation of the internal combustion engine.
A blow-by gas flow path for flowing blow-by gas generated in the internal combustion engine to the intake system;
An exhaust passage for exhausting exhaust gas generated in the internal combustion engine;
A muffler to be a part of the exhaust flow path;
An oil separation space that is part of the blow-by gas flow path and is in contact with the outer surface of the muffler;
The blow-by gas processing apparatus in the internal combustion engine for air conditioners provided with the oil recirculation flow path for taking out the oil isolate | separated from blow-by gas in the said oil separation space from the said oil separation space.   The air according to claim 1, wherein the muffler is formed in a cylindrical shape, and the oil separation space includes an outer peripheral surface of the cylindrical muffler and a cylindrical case that covers the outer peripheral surface. A blow-by gas processing device in an internal combustion engine for an adjusting device.   An oil pan is disposed directly under the engine cylinder, the oil return passage is connected to the bottom of the oil separation space, and the oil separated from the blow-by gas in the oil separation space passes through the oil return passage. The blow-by gas processing apparatus in the internal combustion engine for an air conditioning apparatus according to any one of claims 1 and 2, wherein the oil pan is returned to the oil pan.   Connecting the blow-by gas flow path upstream of the oil separation space to a lower portion of the oil separation space, connecting the blow-by gas flow path downstream of the oil separation space to an upper portion of the oil separation space, and The internal combustion engine for an air conditioning apparatus according to any one of claims 1 to 3, wherein the oil recirculation flow path is connected to the oil separation space at a lower position than a connection portion of the upstream blow-by gas flow path with respect to the separation space. Blow-by gas processing equipment in an engine.

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