DE202022002657U1 - Conveyor line for a device for manufacturing using the powder bed process - Google Patents

Abstract

Conveyor line (100) for a device for manufacturing using the powder bed process with conveyor line section (110),
- the conveyor line section (110) has a wall (114),
- the wall (114) encloses a volume (190) and communicates an inlet opening (140) with an outlet opening (130),
- the conveyor line section (100) has a longitudinal axis (L) or a neutral axis (L),
- the wall has a pressure line connection (125),
- a pressure sensor (210) is connected in communication with the volume, characterized in that at least one filter (172, 174) is installed between the pressure line connection (125) and the volume (190) and/or the pressure sensor (210) and the volume (190 ) is arranged.

Description

technical field

The invention relates to a conveyor line for a device for manufacturing using the powder bed method. The invention makes it easier to detect potential leaks when connecting tank modules.

State of the art

The so-called powder bed process is an additive manufacturing process in which parts of the top layer of a powder bed are irradiated with an energy source in order to connect the corresponding particles of the powder bed with one another, e.g. by sintering and/or welding and/or melting and/or by triggering a chemical Reaction. After one layer has been blasted, another layer of powder is applied by a powder bed coater. The further layer can then be irradiated again. This sequence is iterated until the workpiece to be manufactured can be removed from the powder bed. Powder management and powder handling play a major role in this process. For this purpose, fresh or processed powder is regularly fed in via powder tanks, powder that has already been used is collected in powder tanks and then fed into a processing plant, etc. Leaks often occur when powder tanks are connected to other system parts, e.g. due to defective or missing sealing rings.

So far, leaks have usually been detected with proximity switches that check the distance between two flanges or other mutually complementary coupling units. However, querying the distance via a proximity switch does not provide any conclusions as to whether the connection is really tight. If, for example, a seal is missing between the flange faces, a sensor will still signal a successful coupling. A possible crack in the flexible part of the connecting cable is also not detected. This can result in powder escaping, and the inert gas atmosphere that often has to be kept in the delivery lines and tanks can also be contaminated with atmospheric oxygen.

Presentation of the invention

The invention is based on the observation that when handling material containers or system parts, airtight (more generally fluid-tight) connections have to be made again and again. If these connections are made improperly or if the components are faulty, materials such as powders or gases can escape or enter. A faulty connection is also referred to as a leak and can result in the conveyed material escaping directly into the environment. Also, atmosphere to be maintained by leakage inside the fitting may be undesirably changed. For example, a pressure level can be changed undesirably, or a substance contained in the outer atmosphere, such as oxygen, can be introduced into a protective gas atmosphere that prevails inside.

Maintaining the atmosphere is of great importance, particularly in systems for additive manufacturing with metal powders in a protective atmosphere, in which, for example, powder layers are selectively fused using a laser or electron beam, since otherwise the quality of the workpiece to be manufactured can be impaired. In addition, the materials to be conveyed can also be toxic to humans, so that unwanted leakage must be prevented.

Proceeding from this, the object of the invention is to automatically check coupling points, system sections or circuits for leaks before process sequences can be started and hazardous substances and/or inert gas are released.

This object is achieved by a delivery line according to claim 1. Advantageous refinements of the invention are specified in the dependent claims.

The delivery line can be designed as a vacuum version or as an overpressure version. The advantage of a vacuum version is that no hazardous substances escape in the event of a leak. In addition, the negative pressure variant can be used to evacuate at least small volumes, such as powder bottles, and thus to remove the atmospheric oxygen from the volume. This eliminates the need to flood a powder bottle with shielding gas and reduces shielding gas consumption. With the overpressure version, the system must be protected against critical overpressure in the event of a fault. This can happen, for example, via a safety valve.

The conveying line can be used to connect lines, in particular to connect lines for the pneumatic conveying of powdered materials. However, it can also be used to connect lines in any other type of conveyance. The lines can be pipes or hoses, for example.

The conveyor line can be used in a device for manufacturing according to the powder bed process and then be part of it. The delivery line preferably has a delivery line section. The conveying line section preferably has a wall which encloses a volume, and preferably an inlet opening and preferably an outlet opening. In normal operation, a fluid can flow through the inlet opening into the delivery line section and flow through the volume to the outlet opening in order to exit from the delivery line section there. The volume is consequently a flow path delimited by the wall, which connects the inlet opening and the outlet opening to one another. The terms inlet opening and outlet opening are only used for illustration purposes, instead one could also use first opening or second opening instead, because ultimately the direction of flow is irrelevant to the present invention.

The conveying line section can, for example, be a pipe, a pipe section or also a hose. The delivery line can be made of a metal, plastic, a mineral material, in particular a (high-performance) ceramic, or another common material.

If the conveying line section is straight, it has a longitudinal axis, otherwise the neutral line serves as a reference. In the following, for the sake of simplicity, reference is made to the longitudinal axis for directional information; of course, in the case of a curved line section, the neutral fiber should be used instead.

The inlet opening (“inlet” for short) and/or the outlet opening (“outlet” for short) can be surrounded by a flange, for example. Alternatively, other coupling elements can be provided and/or the line section can be inserted into a system (e.g. for additive manufacturing) by a welded, adhesive or soldered connection.

The wall preferably also has a pressure connection opening, the so-called pressure connection. The volume can be subjected to negative or positive pressure via the pressure connection opening, e.g. if both the inlet opening and/or the outlet opening are closed with an optional inlet valve (more generally: optional first valve) or outlet valve (more generally: optional second valve).

The pressure sensor is preferably connected in a communicating manner to the volume. An optional controller can thus determine the pressure, at least pressure changes, in the volume by reading the pressure sensor.

At least one filter is particularly preferably arranged between the pressure line connection and the volume and/or the pressure sensor and the volume. This can prevent particles transported by a pumped medium from contaminating and thereby damaging the pressure sensor or an overpressure or underpressure source (e.g. a pump) that can be connected to the pressure power connection.

unter (oder gleich) einem vorgegebenen Schwellwert, so gilt der von den drei Ventilen begrenzte Raum als abgedichtet, d.h. leckagefrei. Überschreitet der Betrag des Druckgradienten den vorgegebenen Schwellwert, dann hat der der von den drei Ventilen begrenzte Raum ein Leck. Vorzugsweise wird nur, wenn der von den drei Ventilen begrenzte Raum als abgedichtet gilt, ein Werkstoff mittels des Fördermediums von der Einlassöffnung durch das Volumen zu der Auslassöffnung transportiert. Die Leckageprüfung wird daher vorzugsweise nach dem Anschluss einer neuen (oder anderen) Komponente an die Förderleitung durchgeführt (Messbetrieb) und erst danach die Förderung aufgenommen (Förderbetrieb oder auch Normalbetrieb). Im Normalbetrieb sind vorzugsweise das Einlassventil (das erste Ventil) und das Auslassventil (das zweite Ventil) geöffnet. Vorzugsweise ist der Druckanschluss mittels des Absperrventils verschlossen.The delivery line makes it possible to check its tightness in a measuring operation by closing the inlet valve and the outlet valve. A pressure that deviates from the ambient pressure is then set in the volume via the pressure connection. An optional shut-off valve, which separates the volume from the pressure source, is preferably now closed. The time profile of the pressure in volume is now recorded by means of the pressure sensor (it is sufficient to carry out a first pressure measurement at time t ₀ and then after a period of time Δt (ie at time t ₁ =t ₀ +Δp) to carry out a further pressure measurement). Is the magnitude of the pressure gradient $\left(\left|\Delta p\left(\Delta t\right)\right|=\left|\frac{\left(p\left(t_0\right)-p\left(t_1\right)\right)}{t_0-t_1}\right|\right)$

below (or equal to) a predetermined threshold value, the space delimited by the three valves is considered to be sealed, ie free of leakage. If the magnitude of the pressure gradient exceeds the predetermined threshold value, then the space delimited by the three valves has a leak. A material is preferably only transported by means of the conveying medium from the inlet opening through the volume to the outlet opening if the space delimited by the three valves is deemed to be sealed. The leak test is therefore preferably carried out after a new (or other) component has been connected to the delivery line (measurement operation) and only then does delivery begin (delivery operation or normal operation). In normal operation, the inlet valve (the first valve) and the outlet valve (the second valve) are preferably open. The pressure connection is preferably closed by means of the shut-off valve.

For example, the pressure sensor can be arranged between the filter and the pressure connection. This version is particularly cheap to manufacture.

A first filter is preferably arranged between the pressure connection and the volume. The filter then delimits the volume, ie it represents a boundary between the pressure connection and the volume. The boundary can be flowed through by the carrier fluid (e.g. a gas, preferably an inert gas), but the particles to be transported by the carrier fluid return from the filter being held. In addition, a second filter can preferably be arranged between the pressure sensor and the volume. In this case, the second filter separates an optional measurement volume from the volume. The measurement volume is preferably otherwise closed and can accommodate the optional pressure sensor. In other words, this means that the optional pressure sensor can preferably be arranged in a measuring volume that is connected to the volume via the at least one filter in a manner that communicates with it.

As already described, the inlet opening is preferably preceded by an inlet valve and/or the outlet opening is preceded by an outlet valve. A shut-off valve is preferably installed upstream of the pressure connection, i.e. the optional shut-off valve is preferably located between the pressure connection and the optional pressure source. These valves can be provided on the system side and are usually so.

The first filter and/or the second filter is particularly preferably a sintered filter. The use of sintered filters is based on the realization that the disadvantages of sintered filters, namely their comparatively (comparatively) high pressure drop, do not play a significant role in the present application, on the one hand because the volumes flowing through the filters are small and on the other hand the leakage control only in comp. must be carried out at long intervals. On the other hand, the filters are mechanically heavily stressed during normal operation by abrasive particles, but sintered filters are well able to cope with these stresses. Complicated pre-separators can therefore be omitted. This reduces the costs as well as the construction volume of the line section.

The at least one filter is preferably exchangeable, e.g. fastened to the wall. The at least one filter can be attached directly or indirectly to the wall. For example, the at least one filter is clamped into the wall, preferably screwed, particularly preferably connected via a bayonet connection. The at least one filter can thus be changed easily and without great effort. In the case of two filters, both filters are preferably at least also attached to the wall.

The at least one filter is preferably arranged in a filter insert; in the case of two filters, both of the filters are preferably arranged in one filter insert each. This greatly simplifies the unfortunately unavoidable filter change.

The at least one filter insert is preferably also attached to the wall in an exchangeable manner. For example, the at least one filter insert is attached to the wall via a screw connection, preferably a clamp connection or particularly preferably a bayonet connection. In the case of two filters, both of the filter inserts are preferably at least also attached to the wall. Thus, the unavoidable filter change can be further simplified.

Particularly preferably, the at least one filter and/or the at least one filter insert can be flush with the wall delimiting the volume. In other words, the set of lines continuing from the wall in the direction of flow over the filter and/or the filter insert can be continuously differentiable at least once, preferably at least twice. In normal operation, this minimizes the abrasion of the filter or the filter insert and consequently minimizes the contamination of the material being conveyed. As a result, when the invention is used in the supply line from a powder tank to a powder bed coater, the quality of the finished workpiece is improved. In addition, the flow resistance of the delivery line is reduced because turbulent flows are avoided. The reduction in turbulence also contributes to a longer service life of the filter.

The pressure sensor and/or the pressure connection is preferably arranged on the clean side of the at least one filter. In the case of two filters, the pressure sensor can be installed on the clean side of the first filter and the pressure connection on the clean side of the second filter. The clean side is the side of the filter that faces away from the conveyed medium, i.e. the side that faces away from the volume (= volume of the conveying line section). The position of the pressure connection and/or the pressure sensor on the clean side of the respective filter prevents unwanted mechanical stress on the pressure sensor and/or the pressure connection from abrasive particles. Complicated pre-separators can therefore be omitted. This reduces the costs as well as the construction volume of the line section.

The pressure sensor is preferably arranged in the first filter insert and/or the pressure connection is arranged on the second filter insert. Alternatively, the pressure sensor and the pressure connection can also be arranged in the first filter insert. By arranging the pressure connection and the pressure sensor in a filter insert, unwanted mechanical stress can also be prevented. In addition, it is possible to easily separate the components from the delivery line, which enables easy maintenance.

At least one sealing element can be arranged between the at least one filter insert and the wall. Between each filter insert and at least one sealing element can be arranged in the conveying line section. The sealing element can be an O-ring. The at least one sealing element can be arranged in a groove in the at least one filter insert and/or the wall. The at least one sealing element prevents the unintentional entry or exit of pollutants, materials such as powders, and gases into the inner volume of the connecting pipe. A first sealing element is preferably arranged between the first filter insert and the wall and/or a second sealing element is arranged between the second filter insert and the wall.

In the context of this application, the term “valve” also includes, as usual, so-called “sliders” since they perform the same function. Preferably, the valves mentioned herein are so-called shut-off valves, i.e. they have an open position in which they allow flow and a closed position in which flow is prevented. Valves preferably have at least one actuator. A controller is preferably designed to control the at least one actuator, so that the controller is designed to adjust the at least one valve from the open position to the closed position and of course also from the closed position to the open position.

Just to avoid misunderstandings: The pressure connection can be connected to the pressure source via a pressure line, for example. The optional shut-off valve is preferably arranged in the pressure line. For example, the pressure source may be a pressure bottle (a pressure reservoir), a pump (e.g., a vacuum pump), or the like.

The volume can be a separable volume. The volume can be separated from the surrounding atmosphere. The pressure sensor and the pressure line can be connected airtight (generally conveying fluid-tight) to the conveying line section. A first gap may be formed between the first valve and the inlet and a second gap may be formed between the second valve and the outlet. The first gap can be sealed by a first seal and the second gap by a second seal. The seals can be clamped between the conveyor line section and the respective valve. The seal can be an O-ring, for example.

character list

• 1 zeigt ein Schaltbild einer Ausführungsform einer Unterdruckanordnung einer Förderleitung.
• 2 zeigt ein Schaltbild einer Ausführungsform einer Überdruckanordnung einer Förderleitung.
• 3 eine Schnittansicht einer Förderleitung.

The invention is described below by way of example, without restricting the general inventive concept, using exemplary embodiments with reference to the drawings.

• 1 shows a circuit diagram of an embodiment of a vacuum arrangement of a delivery line.
• 2 shows a circuit diagram of an embodiment of an overpressure arrangement of a delivery line.
• 3 a sectional view of a delivery line.

In 1 is a circuit diagram of an embodiment of a delivery line 100 with leaks 510, 520 shown. In the embodiment shown, the delivery line is preferably operated with a negative pressure, ie during measurement operation the pressure in the delivery line is lower than the ambient pressure. The delivery line 100 can have a delivery line section 110, a pressure line 200, a pressure sensor 210 and a longitudinal axis or a neutral fiber L (cf. 3 ). The conveyor line section 110 can have an inlet opening 140 (“inlet 140” for short) and an outlet opening 130 (“outlet 130” for short) (see Fig. 1 ). A medium to be conveyed can flow from the inlet 140 to the outlet 140 in a preferential flow direction. The conveyor line section 110 can enclose a volume 190 . The delivery line 100 can have an inlet valve 330 and an outlet valve 310 and a shut-off valve 220 . The inlet valve 330 and the outlet valve 310 can be designed as a gate valve, for example. The inlet valve 330 can be communicatively connected to the inlet 140 of the delivery line section 100 . The outlet valve 310 can correspondingly be connected to the outlet ( 130 ) to communicate with the delivery line section 110 . As shown, the inlet 140 and the inlet valve 330 may be connected to each other via a first flange connection 340, but other line connections are also possible. The outlet 130 and the outlet valve 310 can be connected via a second flange connection 320 . Other types of connection, such as a union nut, quick coupling or a sleeve are also possible.

A first seal 342 can be arranged, preferably clamped, between the delivery line section 110 and the inlet valve 310 . A first gap may be formed between inlet valve 330 and inlet 140 and a second gap may be formed between outlet valve 310 and outlet 130 . The first gap can be sealed by a first seal 342 and the second gap by a second seal 322 . The seals 322, 342 can be clamped between the delivery line section 110 and the respective valve 310, 330. The seals 322, 342 may be one or more O-rings, for example. A second seal 322 can be arranged, preferably clamped, between the delivery line section 110 and the outlet valve 310 .

The conveyor line section 110 has a wall 114. The wall 114 has two lateral openings, in each of which a filter 172, 174 is seated in an exchangeable manner. The first filter 172 separates the volume 190 of the delivery line section 100 (the delivery volume) from a measurement volume, i.e. on the clean side of the filter 172 there is a measurement volume 120, which is also referred to as the measurement line section 120. A pressure sensor 210 attached to or in the measuring volume 120 detects the pressure in the measuring volume 120. The other filter 174 separates the volume 190 from the pressure connection 125, i.e. the pressure connection 125 is on the clean side of the other filter 174.

An optional pressure line 200 connects the pressure port 125 to an optional pressure source 230, in this example a vacuum pump. Optional components such as a fine filter 240, a check valve 250 and a shut-off valve 220 are arranged in the pressure line 200. The order shown is preferred, but is purely exemplary and can be changed. As in the in 1 illustrated embodiment, the pressure line 200 have at least one valve 220. The valve 220 can be a seat valve, for example a shut-off valve. The pressure line 200 can be a pipe or a hose, for example.

If the inlet valve 330 and the outlet valve 310 are closed, but the shut-off valve 220 is opened, then the space between said valves 310, 330, 220 is evacuated, i.e. the volume 190 can be subjected to a negative pressure by the negative pressure source 230. If the shut-off valve 220 is now closed and the pressure in the volume 190 can be measured by the pressure sensor 210 over a defined period of time, a leak can be detected using the pressure gradient. In this case, the production operation should not be started. If the tightness is within the specified requirements and there is therefore no leakage 510, 520, the volume can be released for use, e.g. via a controller (i.e. at least the inlet valve and the outlet valve are opened) and the medium to be pumped can flow through the pumping line 100 flow (normal operation). If the increase in pressure exceeds a limit value, the controller can interrupt the process and signal a leak via a display medium.

In 2 1 is a circuit diagram of another embodiment of a delivery line 100 with leakage. This embodiment is also referred to as an overpressure arrangement because the measuring operation preferably includes the step of applying a higher pressure than the ambient pressure. The positive pressure arrangement differs from the embodiment shown in FIG 1 (the negative pressure arrangement) only by the execution of the pressure line 200. In the positive pressure arrangement, the pressure line 200 preferably has an optional pressure reducer 260, for example a pressure regulator or a pressure control valve. In addition, the pressure line 200 can have an optional flood valve 270 . In the overpressure version, the optional flood valve 270 can form the side of the pressure line 200 that faces away from the delivery line section 110 . The optional pressure reducer 260 can be arranged on the delivery line side of the flood valve 270 . In addition, the pressure line 200 can also have an optional safety valve to protect against a critical overpressure in the event of a fault.

3 12 is a sectional view of one embodiment of a delivery line 100. The delivery line may have a delivery line portion 110, a measurement volume 120 (the measurement line portion 120), and a pressure line port 125. FIG. The conveyor line section 110 can have an inlet opening 140 (“inlet 140” for short), an outlet opening 130 (“outlet 130” for short). The conveyor line section 100 can have a wall 114 with a longitudinal axis L and a lateral surface 124 . The wall 114 can enclose a volume 190 . The inlet opening 140 and/or the outlet opening 130 can be delimited by a flange. In the embodiment after 3 For example, the delivery line 100 may be in the form of a cross having a longitudinal axis L. Of course, the delivery line 100 can also have other shapes. A measuring volume 120 and a pressure line connection 125 can branch off radially, for example, orthogonally to the longitudinal axis, with these preferably being separated from the volume 190 by an optional filter 172, 174 each. A pressure sensor 210 can be arranged at least partially in the measurement volume 120 and a pressure line 200 can be arranged at least partially in the pressure line connection 125 . Consequently, at least one filter 172, 174 can be arranged between the pressure line 200 and the volume 190 and/or between the pressure sensor 120 and the volume 190. At least one filter 172, 174 can be arranged between the pressure line connection 125 and the volume 190 and/or between the measuring volume 120 and the volume 190 (=volume of the conveying line section 110). In the embodiment after 3 a first filter 172 can be arranged between the pressure line 200 and the volume 190 and a second filter 174 can be arranged between the pressure sensor 210 and the volume 190 . The at least one filter 172, 174 is preferably a sintered filter. The first filter 172 and/or the second Filters 174 can also be exchangeably fastened at least to the wall 114 . At least one filter insert 150, 160 can be arranged in the measuring volume 120 or in the pressure line connection 125. in the in 3 In the illustrated embodiment, a first filter insert 150 can be arranged in the measuring volume 120 and a second filter insert 160 can be arranged in the pressure line connection 125 . The at least one filter insert 150, 160 can have a lateral surface 152, 162 and an inner wall 154, 164. In the embodiment after 3 the first filter insert 150 can have a first lateral surface 152 and a first inner wall 154 and the second filter insert 160 can have a second lateral surface 162 and a second inner wall 162 . The first filter cartridge 150 and the second filter cartridge 160 may be interchangeable. The first filter insert 150 and the second filter insert 160 can be screwed into the delivery line 100 . In this case, the filter cartridges 150, 160 and the delivery line have a complementary connection. The first filter insert 150 and the second filter insert 160 can also be connected to the delivery line 100 via a plug connection or bayonet connection. The at least one filter 172, 174 can be connected to the at least one filter insert 150, 160 detachably or preferably permanently (not detachably detachable). The first filter insert 150 can be detachably or permanently (not detachably detachable) connected to a housing delimiting the measurement volume 120 . The second filter insert 160 can be detachably or permanently (not detachably detachable) connected to the pressure line connection 125 . The first filter 172 is preferably welded into the first filter insert 150 and the second filter 162 into the second filter insert 160 . At least one sealing element 182, 184 can be arranged between the at least one filter insert 150, 160 and the conveyor line section 110. A first sealing element 182 is preferably arranged between the first filter insert 150 and the measuring volume 120 and a second sealing element 184 is arranged between the second filter insert 160 and the pressure line connection 125 . The at least one sealing element 182, 184 can be arranged in a groove in the lateral surface 162, 164 of the at least one filter insert 150, 160. The first sealing element 182 can be arranged in a groove in the lateral surface of the first filter insert 152 and the second sealing element 184 can be arranged in a groove in the lateral surface of the second filter insert 154 . The first sealing element and the second sealing element help to separate the volume 190 from the surrounding atmosphere. The pressure sensor 210 can be arranged on the clean side of the first filter 172 in the first filter insert 150 . The pressure line 200 can be arranged on the clean side of the second filter 174 in the second filter insert 160 .

Reference List

100

delivery line

110

conveyor line section

120

Measuring volume / measuring line section

125

pressure line connection

112

Lateral surface of delivery line section

114

Wall conveyor line section

130

outlet port / outlet

140

inlet opening / inlet

150

first filter insert

152

Lateral surface of the first filter insert

154

Inner wall of first filter insert

160

second filter insert

162

Lateral surface of the second filter insert

164

Inner wall of second filter insert

172

first filter

174

second filter

182

first sealing element

184

second sealing element

190

Volume of the conveyor line section

200

pressure line

210

pressure sensor

220

seat valve

230

vacuum generator

240

optional fine filter

250

optional check valve

310

second valve/exhaust valve

320

second flange connection

322

second seal

330

first valve / inlet valve

340

first flange connection

342

first seal

510

first exemplary leak

520

first exemplary leak

L

Long axis/neutral axis

Claims (13)

Conveyor line (100) for a device for manufacturing using the powder bed process with a conveyor line section (110), - the conveyor line section (110) has a wall (114), - the wall (114) encloses a volume (190) and communicates between an inlet opening (140) and an outlet opening (130), - the conveyor line section (100) has a longitudinal axis (L) or a neutral axis (L), - the wall has a pressure line connection (125), - a pressure sensor (210) is connected to the volume so that it communicates, characterized in that at least one filter (172, 174) is connected between the pressure line connection (125) and the volume (190) and/or the pressure sensor ( 210) and the volume (190) is arranged. Delivery line (100) after claim 1 , characterized in that a first filter is arranged between the pressure line connection (125) and the volume (190) and that a second filter is arranged between the pressure sensor (210) and the volume (190). Conveying line (100) according to one of the preceding claims, characterized in that the pressure sensor (210) is arranged in a measuring volume (120) communicating with the volume (190) via the at least one filter (1172, 174). Delivery line (100) according to one of the preceding claims, characterized in that the inlet opening (140) is preceded by an inlet valve (330) and/or the outlet opening (130) is followed by an outlet valve (310) and/or the pressure line connection (125). Shut-off valve (220) is connected upstream. Conveying line (100) according to one of the preceding claims, characterized in that the first filter (172) and/or the second filter (174) is/is a sintered filter. Conveying line (100) according to one of the preceding claims, characterized in that the first filter (172) and/or the second filter (174) are/are exchangeably fastened at least also to the wall (114). Conveying line (100) according to one of the preceding claims, characterized in that the at least one filter (172, 174) is arranged in a filter insert (150, 160). Delivery line (100) according to one of claims 2 until 5 , characterized in that the first filter (172) is arranged in a first filter cartridge (150) and the second filter (174) in a second filter cartridge (160). Conveying line (100) according to one of the preceding claims, characterized in that the first filter insert (150) and/or the second filter insert (160) are fastened at least also to the wall (114) in an exchangeable manner. Delivery line (100) according to one of Claims 7 until 9 , characterized in that the at least one filter (172, 174) and/or the at least one filter insert (150, 160) are flush with the wall (114) delimiting the volume (190). Conveying line (100) according to the preceding claim, characterized in that the group of lines continuing from the wall (114) in the direction of flow via the at least one filter (172, 174) and/or the filter insert (150, 160) can be continuously differentiated at least once . Delivery line (100) according to one of claims 2 until 11 , characterized in that the pressure sensor is arranged on the clean side of the first filter (172) and the pressure line connection (125) on the clean side of the second filter (174). Delivery line (100) according to one of Claims 7 until 12 , characterized in that the pressure sensor is arranged in the first filter insert (150) and/or the pressure line connection (125) on the second filter insert (160).

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