JP6259542B1 - Air cleaner cooling structure for internal combustion engines - Google Patents

Abstract

A simple air cleaner cooling structure that suppresses the temperature rise of an air cleaner of an internal combustion engine using cold heat of a low-temperature pipe of an air conditioner provided in a vehicle is provided. An air cleaner includes a filter that captures and removes foreign substances in the air passing therethrough, and a metal shape maintaining body that maintains the shape of the filter. The filter is formed in a cylindrical shape, a rectangular tube shape, or a trapezoidal cylindrical shape in a side view by a bellows-like filter element obtained by folding a planar filter element into a bellows shape. The shape maintaining body is attached to both end openings of a cylindrical shape, a rectangular tube shape, or a trapezoidal cylinder shape, and is configured to maintain these cylindrical shapes. One or both of the cylindrical, square, and trapezoidal cylindrical shape maintaining bodies are connected by a flexible metal conductor coated with a thermal insulator on the outer surface of the low-temperature pipe between the compressor and the evaporator of the air conditioner equipped with the vehicle. . [Selection] Figure 6

Description

  The present invention relates to a cooling structure for an air cleaner that purifies combustion air sucked into a combustion chamber of an internal combustion engine.

  A vehicle equipped with an internal combustion engine is equipped with an air cleaner for removing foreign matters such as dust, dust and impurities contained in the air supplied to the combustion chamber of the internal combustion engine in advance and performing a cleaning process. An air cleaner is attached to an engine room of a vehicle, but there are many devices and parts that become hot such as an engine and a compressor in the engine room. The air cleaner receives heat from these high-temperature parts by radiation, convection, etc., and rises in temperature, and raises the temperature of the combustion air passing through the air cleaner. When the temperature of the combustion air rises, the air filling efficiency of the combustion chamber is lowered, and the engine performance is lowered.

  In order to solve these problems, various proposals have been made to suppress the temperature rise of the air cleaner. For example, in Patent Document 1, a clearance pipe is provided outside the intake path that guides combustion air to the internal combustion engine so as to cover the path, and the heat insulation air is allowed to flow in the heat insulation space between the intake path and the cover pipe. An intake device having a configuration has been proposed. However, it is not easy to provide such a cover tube or flow heat insulation air through the heat insulation space.

  Patent Document 2 discloses an intake air temperature adjusting device that lowers intake air temperature by arranging a latent heat storage material at the outlet of an air cleaner. In the case of this technology, the latent heat storage material may increase the intake resistance, and it may be difficult to ensure a sufficient intake amount.

  Patent Document 3 proposes a technique for cooling the air flowing in the intake passage using acoustic energy generated in the intake passage (acoustic energy due to intake pulsation or the like). However, this technology is intended to cool the air passing through the intake passage by interposing the acoustic stack in the middle of the intake passage. There was a problem of acting as a large intake resistance.

Japanese Patent No. 4660958 JP 2010-138755 A JP 2007-270619 A

  The present invention has been made to solve these problems of the prior art, and the problem is to cool the low-temperature piping of an air conditioner equipped in a vehicle with an air cleaner that purifies the air supplied to the combustion chamber of the internal combustion engine. It is intended to provide a simple air cleaner cooling structure for an internal combustion engine that suppresses the temperature rise by using the cooling.

  The invention according to claim 1 for solving the above problem is a cooling structure of an air cleaner that purifies combustion air sucked into a combustion chamber of an internal combustion engine, and the air cleaner removes foreign matter in the passing air. It is composed of a filter to be removed and cleaned, and a metal shape maintaining body that maintains the shape of the filter. The filter is a flat filter element, or a bellows shape obtained by folding a flat filter element into a bellows shape. The filter element is formed in a cylindrical shape, a rectangular tube shape, or a trapezoidal cylinder shape in a trapezoidal shape in side view, and the shape maintaining body is attached to both end openings of the cylindrical, square tube shape, or trapezoidal cylinder filter, These cylindrical shapes are configured to be maintained, and one or both of the cylindrical shape, the rectangular tube shape, and the trapezoidal tube shape maintaining body is an air conditioner provided in a vehicle. The outer surface of the low-temperature pipe connecting the compressor and evaporator is connected with a flexible metal conductor coated with a heat insulator, and the temperature rise of the air cleaner is suppressed by the cold heat of the low-temperature pipe. The air cleaner cooling structure.

  According to such a cooling structure, the cold heat of the low-temperature piping of the air conditioner device is transmitted to the air cleaner via the flexible metal conductor covered with the thermal insulator, and the temperature rise is suppressed. When the temperature increase of the air cleaner is suppressed, the temperature of the combustion air that passes through the air cleaner and is sucked into the combustion chamber also decreases, so that the air filling efficiency of the combustion chamber increases and the engine performance increases. Such a cooling structure is simple and can be easily attached to an existing vehicle later.

The invention according to claim 2 is an air cleaner cooling structure for purifying the combustion air sucked into the combustion chamber of the internal combustion engine, and the air cleaner removes foreign matter in the passing air and cleans it. And a metal shape maintaining body that maintains the shape of the filter. The filter is formed in a hemispherical dome shape by a filter element, and the shape maintaining body has an air inlet in the center. Appearance mushroom composed of a disc, a hemispherical dome-shaped punching metal that covers the outer surface of the hemispherical dome-shaped filter mounted on the disc, and a support frame that supports the hemispherical dome-shaped filter from the inside Mold air cleaner,
The disk of the air cleaner is connected by a flexible metal conductor coated with a heat insulator on the outer surface of a low-temperature pipe connecting a compressor and an evaporator constituting an air conditioner provided in a vehicle. An air cleaner cooling structure characterized in that an increase in temperature is suppressed.

  According to such a cooling structure, the same effect as that of the invention described in claim 1 can be obtained for the mushroom type air cleaner.

  The invention according to claim 3 is a cooling structure for an air cleaner that purifies the combustion air sucked into the combustion chamber of the internal combustion engine, and the air cleaner removes foreign substances in the passing air and cleans it. And an air cleaner box for detachably storing the filter. The filter is configured by attaching a filter element reinforced with a metal net to an opening of a metal frame, and the air cleaner box is The space inside the box is divided into two by the attachment of the filter, and the air sucked into one space passes through the filter and moves to the other space, and passes through the vent pipe connected to the box portion surrounding the space, the combustion chamber The metal frame of the filter is a compressor constituting an air conditioner provided in the vehicle. The outer surface of the low-temperature pipe connecting the vaporizer is connected by a flexible metal conductor coated with a thermal insulator that penetrates the wall of the air cleaner box, and the temperature rise of the filter is suppressed by the cold heat of the low-temperature pipe. Air cleaner cooling structure characterized by

  According to such a cooling structure, the box-type air cleaner has the same effect as that of the first aspect of the invention.

It is an example of the shape of an air cleaner. It is another example of a shape of an air cleaner. It is an example of the cylindrical air cleaner used by attaching to the inside of the cover 5. It is the structure of the vehicle air conditioner. It is a structural example of the cooling structure of the air cleaner 1a. It is a structural example of the other cooling structure of the air cleaner 1a. It is a structural example of the cooling structure of the mushroom type air cleaner 1d. It is the example of the shape which looked at the hemispherical dome-shaped filter 22 from the lower side. It is an example of the shape of the support frame 23b. It is a structural example of the cooling structure of the box-type air cleaner 1e.

  Hereinafter, an embodiment of an air cleaner cooling structure for an internal combustion engine according to the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are examples of the shape of an air cleaner commercially available as an air cleaner for purifying combustion air sucked into a combustion chamber of an internal combustion engine. The air cleaner 1a shown in FIG. 1 has a trapezoidal cylindrical shape in a side view, and the air cleaner 1b shown in FIG. 2 has a cylindrical shape. In addition, a rectangular tube shape is also commercially available. Each of the air cleaners 1a and 1b is of a type that can be mounted in an uncovered state without a cover in the engine room, but there is another type of air cleaner 1c that is used by being mounted inside the cover 5 as shown in FIG. . The figure is a longitudinal sectional view thereof.

  Each of these air cleaners 1a, 1b, and 1c includes a filter 2 that filters and cleans air, and shape maintaining bodies 2a and 2b that maintain their cylindrical shapes as main components. The shape maintaining bodies 3a and 3b are attached to the cylindrical both-end openings and maintain the opening shape of the filter 2. One shape maintaining body 3a is a plate that closes the opening of the air cleaner, but there is a part in which a hole is provided in the center and a filter element is attached to that part.

  As for the other shape maintaining body 3b, a hole is provided in the center in the air cleaners 1a and 1b of FIGS. 1 and 2, and a vent pipe 4 connected to the combustion chamber is connected to the hole. In the air cleaner 1c of FIG. 3 attached in the cover 5, the vent pipe 4 connected to the combustion chamber is connected to the cover 5, and the shape maintaining body 3b closes the opening on the opposite side of the air cleaner 1c from the air-filled side. It has a structure. There are metal and non-metallic materials for the shape maintaining bodies 3a and 3b. In the present invention, the materials are made of metal.

  The cylindrical filter 2 that removes and cleans foreign substances in the passing air is a flat filter element, or a bellows filter element obtained by folding a flat filter element into a bellows shape, a cylindrical shape, a rectangular tube shape, It is formed by folding into a trapezoidal cylindrical shape or the like when viewed from the side. The material of the filter element is paper fiber, urethane foam (sponge), gauze-like cotton cloth impregnated with special oil, or the like. Recently, many stainless steel meshes are used. Also, many of these different types of elements are stacked, for example, a stack of stainless mesh and cotton cloth is used in a bellows shape. Furthermore, as seen in the inside of the cylindrical shape of the air cleaner 1b in FIG. 2, there is also one in which a thin punching metal provided with holes by punching on a stainless steel plate is used for reinforcement.

  In the air cleaners 1a and 1b in FIGS. 1 and 2, the combustion air is sucked in from the outside to the inside of the cylindrical filter 2 as indicated by the arrows in the drawings. In the air cleaner 1c of FIG. 3, the cylindrical filter 2 comes out from the inside as indicated by an arrow. When passing through the filter 2, foreign matters such as dust, dust and impurities are captured by the filter 2 and removed. In the air cleaners 1a and 1b shown in FIGS. 1 and 2, the air cleaned by the filter 2 is guided to the combustion chamber through the vent pipe 4 connected to the shape maintaining body 3b. In the air cleaner 1 c, the air cleaner 1 c is led to the combustion chamber through the vent pipe 4 connected to the cover 5.

  Incidentally, such air cleaners 1a and 1b, a cover 5 for storing the air cleaner 1c, and the like are attached to the engine room of the vehicle. In the engine room, a lot of high temperature devices and parts such as an engine and a compressor are stored. The air cleaner receives heat from these high-temperature parts by radiation, convection, etc., and rises in temperature. Also, the air in the engine room to be sucked receives heat from the surroundings and the temperature is high. For this reason, the temperature of the air which passed the air cleaner becomes high. When the temperature of the combustion air rises, the efficiency of filling the combustion chamber with air decreases and the engine performance deteriorates. It is an object of the present invention to cool an air cleaner that receives heat from the surroundings and lower the temperature of air after passing. The air cleaner is cooled by introducing cold energy (cold energy) from an air conditioner provided in the vehicle to the air cleaner.

  FIG. 4 shows a general configuration of an air conditioner attached to a vehicle. Home air conditioners are used for both heating and cooling, but the vehicle is heated using the heat of the engine. For this reason, the vehicle air conditioner shown in FIG. 4 is used exclusively for cooling. The operation is roughly as follows. The compressor (compressor) 10 compresses the refrigerant (air conditioner gas) and sends it to the condenser 11 in a high-temperature and high-pressure gas state. The condenser 11 is shaped like a radiator and is mainly mounted in front of the radiator. The refrigerant passing through the inside of the condenser 11 is cooled by air or a fan during traveling and liquefaction proceeds. Impurities and excess water are removed from the liquefied refrigerant by the strainer 13 and sent to the expansion valve 14. In the expansion valve 14, the refrigerant liquefied at low temperature and high pressure is ejected from a small hole all at once and becomes a low temperature and low pressure mist. The low-temperature and low-pressure mist refrigerant is sent to the evaporator 15 placed in the room, and cools the air blown by the blower fan 16. The cooled air flows into the car and cools the car. When passing through the evaporator 15, the refrigerant gives cold heat to the air to increase the temperature, and changes to a low-temperature and low-pressure gaseous state. And it returns to the compressor 10 through the piping 17 which connects the evaporator 15 and the compressor 10. The refrigerant circulates in such a passage.

  Considering the temperature of the refrigerant passing through the pipe 17 connecting the evaporator 15 and the compressor 10 in such a cooling cycle, the refrigerant is given a low temperature when it is input to the evaporator 15 by applying cold heat to the air in the immediately preceding evaporator 15. Although the temperature is higher than the state, it is still in a considerably low temperature state. The pipe 17 through which the low-temperature refrigerant passes is cooled by the refrigerant and is in a low-temperature state. In the present invention, the cold heat of the pipe 17 cooled by the low-temperature and low-pressure refrigerant is used for cooling the air cleaner and suppressing temperature rise.

  FIG. 5 is a configuration example of the cooling structure of the air cleaner 1a shown in FIG. The outer surface of the pipe 17 connecting the evaporator 15 and the compressor 10 and one shape maintaining body 3a of the air cleaner 1a are connected by a flexible metal conductor 18 covered with a thermal insulator. The cold heat of the cooled pipe 17 is transmitted to the air cleaner 1a via the flexible metal conductor 18 to cool the metal shape maintaining body 3a. The cold heat that cools the shape maintaining body 3a is also transmitted to the filter 2 and suppresses the temperature rise. When a stainless steel mesh or a punching metal for reinforcement is used for the filter 2, cold heat is easily transmitted.

  The air cleaner 1a side of the flexible metal conductor 18 may be connected to the shape maintaining body 3b on the vent pipe 4 side connected to the engine. Since the temperature of the vent pipe 4 is increased by receiving heat from the surroundings, the vent pipe 4 is preferably connected to the shape maintaining body 3b via a thermal insulator. When two flexible metal conductors 18 are used as shown in FIG. 6 and both of the shape maintaining bodies 3a and 3b are connected to the outer surface of the pipe 17, the effect is further improved. The air cleaners 1a, 1b, and 1c are often attached closer to the front of the vehicle in the engine room. Since the capacitor 10 is also often attached to the front position of the vehicle, the length of the flexible metal conductor 18 that transmits cold heat may be relatively short.

  FIG. 7 shows an embodiment of a cooling structure for an air cleaner 1d called a mushroom type whose appearance is similar to a mushroom. The mushroom type air cleaner 1d includes a metal shape maintaining body 23 and an air purifying filter 22 incorporated therein. The filter 22 is formed by forming a filter element such as paper fiber, foamed urethane (sponge), gauze-like cotton cloth in which a special oil is infiltrated into a hemispherical dome shape. FIG. 8 shows a shape example of the hemispherical dome-shaped filter 22 viewed from the lower surface side.

  As shown in FIG. 9, the shape maintaining body 23 includes a disc 23a having an air inlet at the center, and a support frame 23b attached on the disc 23a to support the hemispherical dome-shaped filter 22 from the inside. The hemispherical dome-shaped punching metal 23c covering the outer surface of the hemispherical dome-shaped filter 22 as shown in FIG. A hemispherical dome-shaped filter 22 is placed on the support frame 23b, and its outer surface is covered with a hemispherical dome-shaped punching metal 23c for protection. Because the whole resembles the shape of a mushroom, it is called a mushroom-type air cleaner.

  The cooling structure of the mushroom type air cleaner 1d is the same as that of the cylindrical air cleaners 1a, 1b, 1c. FIG. 7 shows the cooling structure. The outer surface of the pipe 17 connecting the evaporator 15 and the compressor 10 of the air conditioner shown in FIG. 4 and the disk 23a of the air cleaner 1d are connected by a flexible metal conductor 18 covered with a thermal insulator. Thereby, the cold heat of the cooled pipe 17 is transmitted to the disk 23a through the flexible metal conductor 19, and the metal disk 23a, the support frame 23b, and the hemispherical dome-shaped punching metal 23c are cooled. The hemispherical dome-shaped filter 22 is also cooled by the cold heat. Thereby, the temperature rise of the combustion air which passes the air cleaner 1d is suppressed.

  FIG. 10 shows an embodiment of a cooling structure for a box type air cleaner 1e. This type of air cleaner 1e includes a filter 25 and an air cleaner box 26 in which the filter 25 is detachably accommodated. In FIG. 10, the structure of the air cleaner 1e is shown in a sectional view. This type of air cleaner 1e is often employed in vehicles that take in combustion air from outside the vehicle rather than from inside the engine room where the temperature is high.

  The filter 25 is configured by attaching a filter element to an opening of a metal frame 27 having a rectangular or round cross section. The filter element is reinforced by sandwiching both sides with a metal mesh, or attached to a bellows-like metal mesh. In the air cleaner box 26, the space in the box is divided into two by the attachment of the filter 25, and the air sucked into one space passes through the filter 25 and moves to the other space, and a ventilation pipe connected to the box portion surrounding the space. 4 flows into the combustion chamber.

  The cooling structure of the box-type air cleaner 1e is the same as that of the cylindrical air cleaners 1a, 1b, 1c, and 1d. FIG. 10 shows the cooling structure, and the flexible metal conductor 18 in which the outer surface of the pipe 17 connecting the evaporator 15 and the compressor 10 of the air conditioner shown in FIG. 4 and the metal frame 27 of the filter 25 are covered with a heat insulator. It is configured by connecting with. The flexible metal conductor 18 is punched into the air cleaner box 26 and pulled into the box. As a result, the cold heat of the cooled pipe 17 is transmitted to the metal frame body 27 via the flexible metal conductor 19 to cool the filter 25, and the temperature rise of the combustion air passing through the filter 25 is suppressed.

  The above-described cooling structure of the air cleaner for the internal combustion engine has a simple configuration. It is also easy to retrofit the existing internal combustion engine later. If the temperature of the air cleaner is lowered as much as possible with such a structure, the temperature of the combustion air that passes through the air cleaner and is sucked into the combustion chamber of the internal combustion engine decreases, and the air filling efficiency of the combustion chamber increases. Engine performance will increase.

  In the drawings, 1a, 1b, 1c, 1d and 1e are air cleaners, 2 is a filter, 3a and 3b are shape maintaining bodies, 4 is a vent pipe, 5 is a cover, 10 is a compressor, 15 is an evaporator, 11 is a condenser, 12 Is a condenser fan, 13 is a strainer, 14 is an expansion valve, 17 is piping, 18 is a flexible metal conductor, 19 is a screw, 20 is a metal ring, 22 is a hemispherical dome-shaped filter, 23 is a shape maintaining body, 23a Is a disk, 23b is a support frame, 23c is a hemispherical dome-shaped punching metal, 25 is a filter, 26 is an air cleaner box, and 27 is a metal frame.

Claims (3)

An air cleaner cooling structure for purifying combustion air sucked into a combustion chamber of an internal combustion engine, the air cleaner removing a foreign substance in air passing therethrough and maintaining the shape of the filter It consists of a metal shape maintenance body,
The filter is a flat filter element, or a flat bellows filter element obtained by folding a flat filter element into a bellows shape.
The shape maintaining body is attached to the filter both ends opening of a cylindrical shape, a rectangular tube shape, or a trapezoidal tube shape, and is configured to maintain those cylindrical shapes,
One or both of the cylindrical, square, and trapezoidal cylindrical shape maintaining bodies is a flexible metal whose outer surface of a low-temperature pipe connecting a compressor and an evaporator constituting an air conditioner provided in a vehicle is covered with a thermal insulator. A cooling structure for an air cleaner, characterized in that it is connected by a conductor and configured to suppress the temperature rise of the air cleaner by the cold heat of the low temperature piping. An air cleaner cooling structure for purifying combustion air sucked into a combustion chamber of an internal combustion engine,
The air cleaner is composed of a filter that removes and cleans foreign substances in the passing air, and a metal shape maintaining body that maintains the shape of the filter,
The filter is formed in a hemispherical dome shape by a filter element, and the shape maintaining body is a hemispherical shape that covers a disc having an air inlet in the center and an outer surface of the hemispherical dome filter attached on the disc. A mushroom type air cleaner composed of a dome-shaped punching metal and a support frame that supports the hemispherical dome-shaped filter from the inside.
The disk of the air cleaner is connected by a flexible metal conductor coated with a heat insulator on the outer surface of a low-temperature pipe connecting a compressor and an evaporator constituting an air conditioner provided in a vehicle. A cooling structure for an air cleaner, characterized in that the temperature rise is suppressed. An air cleaner cooling structure for purifying combustion air sucked into a combustion chamber of an internal combustion engine,
The air cleaner is composed of a filter that removes and cleans foreign matter in the passing air, and an air cleaner box that detachably stores the filter,
The filter is configured by attaching a filter element reinforced with a metal net to the opening of a metal frame, and the air cleaner box is divided into two spaces by the attachment of the filter, and the air sucked into one space is It passes through the filter, moves to the other space, and is configured to flow to the combustion chamber through a vent pipe connected to a box portion surrounding the space.
The metal frame of the filter is connected to the outer surface of the low-temperature pipe connecting the compressor and the evaporator constituting the air conditioner provided in the vehicle by a flexible metal conductor covered with a thermal insulator that penetrates the wall of the air cleaner box, A cooling structure for an air cleaner, characterized in that the temperature rise of the filter is suppressed by the cold heat of the low-temperature piping.