JPH0710455U - Air cleaner - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an air cleaner with less airflow resistance, which has a large air inlet portion of the housing to reduce the inflow resistance of the inlet portion and has a large number of parts that can secure a wide spiral flow passage. The purpose is to do. A housing 1 having a tangential air inlet 4 arranged on a side wall adjacent to one end, a dust discharge opening 17 at the other end, and a pair of end walls 2, 3; The filter element 6 housed in the housing and the housing 1 so as to communicate with the inside of the filter element 6.
In the air cleaner having the clean air outlet 5 provided in the above, the outer wall of the introduction portion 4a of the air inlet 1 is curved outward 4b and connected to the housing 1 so that the inflowing air does not come into direct contact with the filter element 1. A baffle plate 13 is provided between the housing 1 and the filter element 6 so as to close the introduction portion 4a of the air inlet 4.
3a is attached to the housing 1, and the terminal end 13b is attached so that the curved portion 4b of the air inlet 4 is located in the vicinity of the connection with the housing 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a centrifugal air cleaner for an internal combustion engine, and more particularly to a technique for reducing the air resistance of the air cleaner.

[0002]

[Prior art]

 Air cleaners used in internal combustion engines for construction machinery, large internal combustion engines, farm trucks, and the like are often centrifugal ones in which a centrifugal first-stage cleaner and a second-stage filter element of a filter medium are combined. The first stage purifier separates large particles of dust from the incoming air by centrifugation and the remaining small particles are removed from the air by a pleated cylindrical filter element on the downstream filter media.

As such an air cleaner, for example, the one disclosed in Japanese Utility Model Publication No. 54-16859 is provided with a dust slope for deflecting the inflowing air from the air inlet of the housing to the downstream side in a spiral vortex, and the inflowing air is swirled. And the centrifugal force separates large particles of dust. In this way, large dust in the inflowing air is separated, the load of dust on the filter element consisting of the second stage filter material is lightened, and the air cleaner lasts longer. However, in reality, there were technical problems described below.

[0004]

[Problems to be solved by the device]

 That is, the first-stage centrifugal purifier causes a swirling motion in the inflowing air to separate the dust, and thus causes a swirling motion in the narrow passage between the housing and the baffle plate, which causes inflow resistance. This causes suction resistance to the internal combustion engine, which causes the output to drop. The filter element is repeatedly cleaned when it reaches a certain ventilation resistance value, and it is replaced when the recovery of the filter element due to cleaning is not sufficient.Therefore, it is advantageous that the width to reach a certain ventilation resistance value is large. . Therefore, the filter life is disadvantageous as the initial ventilation resistance is higher, and there is a problem that the cleaning element must be repeatedly cleaned and replaced at an early stage.

The present invention solves the above problems by curving the outer wall of the inlet portion of the air inlet of the housing outward to increase the air inlet portion to reduce the inflow resistance of the inlet portion. It is an object of the present invention to provide an air cleaner with a small amount of ventilation resistance, which has a large number of parts capable of ensuring a wide spiral flow passage.

[0006]

[Means for Solving the Problems]

 To achieve the above object, the present invention provides a housing having a tangential air inlet disposed on a side wall adjacent to one end, a dust discharge opening at the other end, and a pair of end walls. In an air cleaner having a filter element housed in the housing and a clean air outlet provided in the housing so as to communicate with the inside of the filter element, an outer wall of an inlet portion of the air inlet is outwardly directed. A baffle is attached to the housing to prevent direct contact of the inflowing air with the filter element by bending it to the housing, the baffle having one end closing the inlet of the air inlet and It is characterized in that its end is attached so that the curved portion of the inlet is located in the vicinity of the connection with the housing.

[0007]

[Action]

 According to the above configuration, the outer wall of the inlet portion of the air inlet of the housing is curved outward, the inlet portion of the air is enlarged to reduce the inflow resistance of the inlet portion, and the baffle plate is provided between the housing and the element. The spiral-shaped flow passes over the baffle plate because one end is attached to the housing so that the inlet of the air inlet is closed and the end is located near the curved portion of the air inlet that connects to the housing. A wide swirl flow path can be secured, and a sufficient swirling flow for separating dust can be secured while reducing the separation efficiency without lowering the ventilation resistance, and increasing the filter life by reducing the initial ventilation resistance. You can

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the air cleaner according to the present invention. FIG. 2 is a cross-sectional view of the air cleaner taken along line 2-2. In both figures, 1 is an elongated cylindrical housing having a pair of opposed end walls 2,3. An air inlet 4 arranged tangentially to the cylindrical wall of the housing 1 forms an inlet 4a, the outer wall of the inlet 4a being connected to the housing 1 with a curved portion 4b projecting outward.

An axial air outlet tube 5 is attached to the housing 1 through the center of the end wall 3. The cylindrical pleated filter element 6 is fixed between the upper and lower end plates 6a and 6b by sandwiching a pleated and cylindrically formed filter member 6c and an inner cylinder 6d with a reinforcing hole. The filter element 6 is mounted in the housing 1 by means of a support member 7, a threaded rod 8 and a wing nut 9 against the end wall 3 via a packing 10. The end wall 2 is fastened via a packing 12 to the housing 1 by means of a wing nut 11 screwed into a threaded rod 8.

The housing 1 has a first deflecting piece 13. The first deflecting piece 13 has an introduction portion 4a of the air inlet 4 between the housing 1 and the element 6 so that the inflowing air does not directly contact the filter element 6 so as to surround the outer wall of the filter element 6. One end 13a is attached to the housing 1 so as to be closed, and its end 13b is attached so that the curved portion 4b of the air inlet 4 is located in the vicinity of the connection with the housing 1.

The housing 1 also has a second cylindrical deflecting piece 14. The second cylindrical baffle piece 14 surrounds the other end of the filter element 6 to form an air passage 15, which prevents dust from accumulating on the filter element 6 and has a discharge valve 16. Helps discharge of dust to the discharge pipe 17.

In the above structure, when air containing dust flows into the housing 1 from the air inlet pipe 4, the air inlet 4 forms the introducing portion 4a, and the outer wall of the introducing portion 4a is curved outwardly. Since the portion 4b is provided, the air introduction portion 4a is widened and the inflow resistance into the housing 1 is reduced. The air is located in the vicinity where one end 13a is attached to the housing 1 so that the first deflecting piece 13 closes the introduction portion 4a of the air inlet 4 and the curved portion 4b of the air inlet 4 is connected to the housing 1. As its end 13b is attached, after passing through the baffle plate 13, the air passage flows through the wide annular passage 18 formed between the side wall of the housing 1 and the filter element 6 and forms a spiral vortex. As a result, the passage resistance is reduced and a spiral flow sufficient for dust separation is maintained, and large particles of dust are separated by the centrifugal force while moving toward the other end of the filter element 6.

In the first-stage centrifugal cleaner, large particles of dust are separated by centrifugal force and enter the air passage 15 between the second cylindrical deflecting piece 14 and the housing 1 to pass through the filter element. The flow to 6 is blocked to prevent the accumulation of dust on the filter element 6, and is discharged from the discharge valve 16 of the dust discharge pipe 17 into the atmosphere by the pulsating flow of air.

The small dust that has not been separated by the centrifugal cleaner of the first stage is filtered by the filter element 6 of the filter medium of the second stage, and the purified air is supplied from the air outlet pipe 5 to the internal combustion engine. To be done. When the filter element 6 reaches a certain limit of air resistance due to dust clogging, remove the wing nut 11 from the threaded rod 8, remove the end wall 2 from the housing 1, and then screw in the wing nut 9. Remove from the rod 8 and take out the filter element 6 from the housing 1 for cleaning, put the filter element 6 in the housing 1 and attach it with the wing nut 8, then attach the end wall 2 to the housing 1 with the wing nut 11. Install. In this way, the cleaning is repeated and the filter element 6 is replaced when the restoring force due to the cleaning of the filter element 6 becomes small.

[0015]

As described in detail with reference to the above embodiments, in the air cleaner according to the present invention, when the air containing dust flows into the housing from the air inlet pipe, the air inlet forms an introduction portion. Since the air introduction part is widened because it has a curved part that projects the outer wall of the introduction part to the outside, the inflow resistance to the housing is reduced, and the air is introduced into the introduction part where the first deflection part is the air inlet. One end is attached to the housing to close the housing, and the end is attached so that the curved portion of the air inlet is located near the connection to the housing, so that it passes the baffle plate and the side wall of the housing and the filter element. The wide annular passage formed between the mentments creates a spiral vortex that reduces the flow resistance.

Due to this decrease in ventilation resistance, the output of the internal combustion engine can be increased, and the range of increase in resistance from the initial resistance of the air cleaner to the increase in resistance to a certain limit increases. The first-stage centrifugal cleaner reduces the ventilation resistance without lowering the separation efficiency, so the filter life before cleaning the filter element can be increased and the frequency of repeated cleaning can be reduced. is there.

[Brief description of drawings]

FIG. 1 is a sectional view of an air cleaner according to the present invention.

FIG. 2 is a transverse cross-sectional view of the air cleaner taken along line 2-2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2, 3 End wall 4 Air inlet 4b Curved part 5 Air outlet pipe 6 Filter element 13 Baffle piece (baffle plate) 18 Annular passage

Claims (1)

[Scope of utility model registration request] 1. A housing having a tangential air inlet disposed on a side wall adjacent to one end, a dust discharge opening at the other end, and a pair of end walls, and housed in the housing. In an air cleaner having a filter element and a clean air outlet provided in the housing so as to communicate with the inside of the filter element, an outer wall of an introduction portion of the air inlet is curved outward and connected to the housing, and an inflow is made. A baffle is attached to the housing to prevent air from coming into direct contact with the filter element, the baffle having one end closing the inlet of the air inlet and a bend near the air inlet connecting to the housing. An air cleaner characterized in that its end is mounted so that it is located.