DE1598131A1 - Device for determining the dust content in flowing gases, especially the soot content in exhaust gases from diesel engines - Google Patents

Description

R. no. 8695

August 24, 1966 Wf / Ke

Attachment to

Patent and

Utility model registration

ROBERT BOSCH OMBH, Stuttgart W, Breitscheidstrasse

Device for determining the dust content in flowing Gases, especially the soot content in exhaust gases from diesel engines "__

The invention relates to a device for determining the dust content in flowing gases, especially the soot content in exhaust gases from diesel engines, with a pump, the piston from its interior can be moved into its outer dead center position (outward) and thereby a certain amount of exhaust gas is sucked into the pump chamber through a filter paper, which is drawn by a clamping part that can be moved away from the pump housing into which the AbgnazuführunRSleitung opens, eats tightly.

BATH

Robert Bosch GMBH . R. no. 8695

Stuttgart, August 24, 1966 "Wf / Kq

In a known device of this type (see German patent specification 1 032 005) is the clamping part in the manner of a Schnellvar lock * such as ar is used for bottles, for example, attached to the housing of the pumpa. After loosening the clamping part, a round pilter paper disc inserted into a corresponding recess in the cylinder wall of the pump housing and then the clamping part put on and clamped in place »With a well-known one Execution form is the clamping part by means of a union nut on the Housing attached, after loosening the union nut, a filter disc can be inserted into a laterally exposed slot * Then the union nut is tightened and the filter disc is tightened by the clamping part.

In these known devices, the outward travel of the piston is carried out by a spring force; its return travel must be effected manually with the aid a piston rod protruding from the housing, on which the the spring causing the outward attack engages.

This manual tightening and loosening of the clamping part for the filter disc and moving the piston back by hand is quite cumbersome and time consuming. Handling the known devices is therefore perceived in practical use when many measurements are to be made as laborious and time-consuming.

Der.Erfindung is based on the task of improving the devices of the type described above so that the above-described operation of the clamping part and the piston, which had to be carried out by hand, is possible on its return path automatically or by an assistant, and thereby the handling of the device is facilitated,

A substantial advance in the desired direction is achieved according to the invention in that the clamping or release position of the clamping sleeve depends on the position of the pump piston

BATH ORIGINAL

Robert Bosch GmbH R.-No. _{9 8695}

Stuttgart 8/24/1966 Wf / Ke

An advantageous embodiment of this solution is obtained when the piston is in its inner dead center position by means of the clamping part a transmission member penetrating the wall of the pump housing holds against a spring force in the release position and On his way there shortly after the start of this movement to his own outer dead center position releases the clamping part, and this at the same time assumes its clamping position vmter the action of the spring force. Another step towards the desired goal arises when According to a further development of the invention in a device, the piston of which is moved outwards by a spring force, to the pump cylinder a line for compressed air is connected. which move the piston from its outer to its inner dead center position able «Here it is advantageous to use an arbitrarily actuatable Valve is provided, 'which is connected to the pressure line and preferably attached to the pump housing *

The drawing shows an exemplary embodiment of the subject matter of Invention Show

Fig. 1 is a view of the device, partially in

sehematic representation, Fig. 2 is a section through the pump along line ΙΙ-ΙΪ

in fl. 1,
Flg. 1 shows a section through a control valve

Line III-III in Fig. 4,
4 shows a view of the control valve in the direction of arrow A in FIG.

The pump of a device for determining the soot content in exhaust gases from diesel engines has a cylinder liner 1. A union nut 2 is screwed onto one end of this cylinder liner, a sleeve J covers a cover 4 and this against the front end of the cylinder liner 1 tensioned, in the sleeve 3 a tensioning part 5 is axially displaceable and ßichert against pre-turning by a pin 6, dor in a longitudinal groove 7 on the inside of the

009821/0820

BAD OR1G ¹ N ^AL

-U-

Robert Bosch GmbH 'R.-Nr. 8695

Stuttgart "* 24.8.1966 Wf / Ke

Sleeve 3 engages. A compression spring 8 is clamped between an inner shoulder 3 * di $ r sleeve 5 and a collar 5 * of the clamping part 5, which tries to move the clamping part 5 against the cover 4 zxx and thereby tighten a filter paper strip 9 »

A hose 10 is connected to the axially pierced clamping part, the zvi of a sampling probe 12 leads to the determination the soot content is introduced into the exhaust pipe of the diesel engine to be tested, the cover 4 has an axial threaded hole for receiving a screw 13c- This has a multi-stepped Axi & lbohrung, the narrowest section of which is a throttle point 13 'forms. The opposite face of the screw? client to support the filter paper strip 9.

In the cover 4 there are two pins 14 parallel to the pump axis as close as possible. In the position shown the protruding into the pump cylinder end of these pins lies on one Pump piston I5 and its outer end on the collar 5 * of the clamping part 5 to “The pins 14 hold the clamping part 5 against the force the spring 8 in such a position that the between the tensioning part 5 and the throttle screw of the housing cover 4 inserted filter paper strips is easy to move.

The pump piston I5 is attached to the inner end of a piston rod Io, the outer end of which carries a handle IT. A cap 18, to which a sleeve 19 is attached, is screwed onto the end of the cylinder liner 1 opposite the cover 4. A sleeve 20 is arranged coaxially between this sleeve 19 and the piston rod 16. One end of a helical spring 21 is supported on an inner shoulder 19 ^{1 of} the sleeve 19, the other end of which rests against an outer collar 20 * of the sleeve 20. The sleeve 20 has an inner collar 20 ″ on which one end of a second helical spring 21 'is supported, the other end of which rests against a washer 22 which is fastened to the piston rod by a nut 23. A rubber bellows 24 protects the screw jacks.

009821/0820 bad original

Robert Bosch GmbH R.-No. * 8695

Stuttgart 24.8 a 966 Wf / Ke

springs 21, 21 ' ^s from dirt »One end of the rubber bellows is clamped on the sleeve 19, the other end between the washer 22 and the nut 23. The two helical springs 21, 21 ′ together cause the pump piston 15 to move outwards.

Inside the cap 18 is a release device, not shown housed, which is able to hold the pump piston in the position shown. The device can be activated by pressing a Rubber bellows 25, which is connected to the device by a hose line 26, are brought into their Auslöaelage in which they enables the piston 15 to perform its outward travel under the action of the springs 21, 21 *.

A roll of the pilter paper strip 9 is accommodated in a magazine which is attached to the cylinder liner 1. The strip of pilter paper 9 can be passed from the magazine through a slot 9 'in the pump cylinder and into a transport device 28 are inserted opposite the magazine on the cylinder liner is arranged. The transport device has a rotary knob 29. By turning this knob, the pilter paper strip 9 can be moved on step by step.

An operating valve 351 is attached to the transport device 28. This has a valve housing 32, which has a multi-stepped bore, in its narrowest section 33 RöhrstUck 34 is performed. The pipe section 34 is in a part 35 pressed in, which has a push button 36 at its other end - The part 35 is guided and lies in a cannulated screw 37 in the position shown under the action of a spring 38 with a Collar 35 'on an inner shoulder of screw 37 * the section 39 of the bore leading through the valve housing is connected to the interior of the pipe section 34 by a radial bore 40. from the Bohrungsabsohnitt 39 leads © ine bore 41 to the outside.

BATH ORIGINAL

009821/0820. _6th

Robert Bosch GmbH R. ~ ϊ \ τ. 86Q5

Stuttgart '24, 8, 1966 Wf / Ko

Opposite the screw 37 is in the stepped bore of the valve housing s 32 sin valve support 42 screwed in, the guide a valve member 43 is used, aas in the position shown A valve spring 44 is pressed against a valve seat 45. At A rubber ring 46 is inserted into the valve assembly at the dioht point * The valve member 43 has a conical projection 47, together with it the end of the pipe section 34 forms a second valve which is in the location is open. From the section designated by 48 of the bore leading through the valve housing 32 branches off a bore 49, to which a pipe 50 is connected, Diasa Pipeline leads to a connection piece 51 »that goes into the .im <ere the cylinder liner opens *

From the section designated 53 by the valve housing 32 leading bore branches off a bore 54 into which a connector 55 opens, which carries a piece of pipe 55 *. This client for connecting a compressed air line, not shown.

The device described works as follows: the parts of the device are drawn in the position that they voj? Start a determination of the soot content in the exhaust gas of the diesel engine to be tested. The pump piston is in its inner dead center position. By pressing the rubber bellows ? S , the release device, not shown, accommodated in the cap 18 is actuated, and the springs 21, 21 'move the pump piston to the right, whereby it executes its outward movement.

During the first short section of the outward travel of the pump piston 15, this is followed by the pins 14 and the tensioning part 5 under the action of the compression spring 8 until the tensioning part 5 presses the filter paper strip against the throttle screw 13. From this position the pump piston sucks exhaust gas on its way there through the filter paper 9 into the interior of the cylinder liner 1. The exhaust gas takes its way through the sampling probe 12, the line 10, the axial bore of the clamping part 5 and the throttle screw 13- Die Drosaelstelle 13 ^f determined together with

009821/0820 BAD original

Robert Bosch GmbH R. No. 8695

Stuttgart 8/24/1966 Wf / Ke

the force of the springs 21, 21 * the tent for the outward travel of the pump piston. The kiss in the exhaust is deposited on the filter paper.

J) iö wäbrond the outward path of the pump piston by this air displaced from the cylinder liner flows through the line 50 into the valve housing 32. In this valve housing, the air flows from the bore 49 through the pipe section J ^, which is open at its end, and from there through the bores 40, 39 and 41 to the outside.

Pressing the push button 36 opens the pipe section ? 4 through the cone 4? closed And at the same time the valve member Hj lifted from Bfvinein seat 45. Now compressed air comes out of the ~ mentioned the line via the connection piece 55 and the open valve into the line 50 and thus into the cylinder liner 1 under the in my outer dead center position pump piston I5 and pushes this back to its inner dead center position. In the last part this return path of the pump piston moves the latter the pins 14 and thus also the S ^ .pannteil 5 to the left in the position shown. In the process, the tensioning part releases the filter paper strip 9, and this can either be stepped through the transport device moved on for a new test process or completely removed from the Transport device are pushed out to reduce the soot content of the To determine the amount of exhaust gas. The device is ready for a new test process ready.

In addition to avoiding the deficiencies of the known devices described at the beginning, the device according to the invention has the advantage that stronger return springs 21, 21 ^f can be used than before, which, in cooperation with a narrower throttle, result in the same time for the outward journey, but with the friction of the The pump piston has a smaller influence on the time it takes to travel there than with the known devices *

BATH 009821/0820

Claims (1)

Robert Bosch GmbH R.-No J ό ^ § Stuttgart g 24.8.1966 Wf / Ke Expectations 1 * device for determining the dust content in flowing gases, in particular the soot content in exhaust gases from diesel engines, with a pump, the piston of which can be moved from its inner to its sweet dead center position "1st (outward) and thereby a best Itmnt amount of exhaust gas through a filter paper into the pump room sucks, which can be clamped by a clamping part which can be moved away from the pump housing and into which the exhaust gas feed line opens is characterized in that the clamping or releasing position of the clamping part (5) is dependent on the position of the pump tank piston (15) is. 2 «apparatus according to claim l _g characterized in that the piston (15) in its inner dead center position of the clamping part (5) by means of the wall of the pump housing penetrating transfer member \ 14) against a spring force (8) in dor release position and on its Way After the start of this movement, the clamping part (5) is released up to its outer dead center position and this takes up its clamping position under the action of the spring force (8). J5. Device according to Claim 2, characterized in that the transmission member at least one pin (14) is used, which is in a front wall of the pump housing forming-vr? Housing cover (4) is led. BATH ORIGINAL 009821/0820 Robert Bosch GmbH R. No. 8695 Stuttgart 8/24/1966 Wf / Κβ 4 "Device according to one of the preceding claims with a piston, the outward movement of which is effected by spring force, characterized in that a line (50) for Compressed air is connected, which is able to move the piston (15) from its outer to its inner dead center position, 5 »Device according to claim 4, characterized in that an arbitrarily actuatable valve (31) is provided which is switched into the compressed air line (55 ^f - 50) and is preferably firmly connected to the pump housing, 6. Device according to one of the preceding claims, characterized in that that the filter paper (9) is strip-shaped in the well-known catfish and with the inner dead center position of the piston (15) can be shifted step by step in a manner which is also known per se is. _BATH 009821/0 820