Automatic exhaust valve based on electromagnetic control

Abstract

The utility model belongs to the technical field of exhaust design of hydraulic systems, and particularly relates to an automatic exhaust valve based on electromagnetic control, which can be connected with an external electromagnet controller through an electromagnet power supply socket to control power-on and power-off of an annular electromagnet, so that the automatic exhaust valve is conveniently controlled to be in an exhaust state and a closed state; only when the hydraulic system needs to be exhausted, the automatic exhaust valve is controlled to be in the exhaust state, and the situation that when the airplane is in the air state and the hydraulic system does not need to be exhausted, oil leaks, ground maintenance work is affected, and airplane performance is affected can be reliably avoided.

Description

Technical Field

[0001] The present application belongs to the technical field of hydraulic system exhaust design, and specifically relates to an automatic exhaust valve based on electromagnetic control. Background Art

[0002] Aircraft hydraulic systems have clear and strict requirements on the gas content in the oil. If the gas content in the hydraulic system oil exceeds the standard, it will endanger the hydraulic system and cause problems such as insufficient oil suction in the hydraulic pump, cavitation, and reduced volumetric efficiency, resulting in local high pressure and high temperature, and reducing the life of hydraulic accessories and pipelines. For this reason, an automatic exhaust valve will be installed in the hydraulic system to discharge the gas in the oil and reduce the gas content in the oil.

[0003] At present, the automatic exhaust valves used in aircraft hydraulic systems often have the following problems:

[0004] 1) When the gas in the oil is discharged, part of the hydraulic oil will be discharged together;

[0005] 2) When exhaust is not required, there will usually be a certain amount of hydraulic oil leakage.

[0006] With the improvement of aircraft maintenance requirements, the oil leakage of automatic exhaust valve has a great impact on ground maintenance work. In addition, when in the air, the leaked hydraulic oil will adhere to the surface of the aircraft and affect the performance of the aircraft.

[0007] This application is proposed in view of the above-mentioned technical defects. Utility Model Content

[0008] The purpose of the present application is to provide an automatic exhaust valve based on electromagnetic control to overcome or alleviate at least one of the technical deficiencies of the known ones.

[0009] The technical solution of this application is:

[0010] An automatic exhaust valve based on electromagnetic control, comprising an inlet adapter cylinder, an intermediate adapter cylinder, and an outlet adapter cylinder connected in sequence, wherein an adaptive exhaust structure is arranged in a channel formed by the inlet adapter cylinder, the intermediate adapter cylinder, and the outlet adapter cylinder;

[0011] An annular electromagnet is arranged in the inlet end of the inlet adapter tube, and an annular sealing protrusion is arranged in the inlet adapter tube;

[0012] A valve core is arranged in the annular electromagnet, one end of the valve core extends into the annular electromagnet, the end portion has an axial flow hole, the other end portion of the valve core has a valve head, and the side wall of the end has a transverse flow hole connected to the axial flow hole;

[0013] A valve core spring is sleeved around the outer periphery of the valve core, and both ends of the valve core spring abut between the annular electromagnet and the valve head. The valve head abuts against the annular sealing protrusion by elastic force to block the middle hole of the annular sealing protrusion.

[0014] An electromagnet power supply socket is arranged outside the imported adapter tube, which is connected to the annular electromagnet through a line, and is connected to an external electromagnet controller to control the power on and off of the annular electromagnet;

[0015] The adaptive exhaust structure includes a swimming block, an annular support seat at the inlet end, an annular support seat at the outlet end, and a flow head;

[0016] The inlet end annular support seat is pressed against the step structure provided in the outlet end of the inlet adapter tube by the inlet end of the intermediate adapter tube, and is positioned with the inlet end of the intermediate adapter tube by the structure of the annular groove and the annular protrusion;

[0017] The flow head is arranged on a step structure arranged in the inlet end of the outlet adapter cylinder;

[0018] The annular support seat at the outlet end is pressed against the step structure provided at the flow head by the inlet end of the intermediate adapter tube, and is positioned with the outlet end of the intermediate adapter tube by means of an annular groove and an annular protrusion matching structure;

[0019] The swimming block is arranged in the middle transfer tube, and there is an airflow circulation annular gap between the swimming block and the middle transfer tube. A swimming block spring is arranged between the swimming block and the circulation head. The swimming block spring relies on its elastic force to make the swimming block lean against the annular support seat at the inlet end.

[0020] One end of the swimming block facing the outlet end annular support seat has a mounting hole, and the swimming block spring is arranged in the mounting hole;

[0021] The annular support seat at the inlet end and the annular support seat at the outlet end are elastic, and both ends of the swimming block are designed to be annular cutting edges.

[0022] Optionally, in the above-mentioned automatic exhaust valve based on electromagnetic control, the outlet end of the outlet adapter tube is bent 90° to form a pipe joint to connect the exhaust pipeline.

[0023] Optionally, in the above-mentioned automatic exhaust valve based on electromagnetic control, connecting edges are set between the inlet adapter tube, the intermediate adapter tube, and the outlet adapter tube, which are connected by bolts and positioned by a matching structure of annular grooves and annular protrusions.

[0024] Optionally, in the above-mentioned automatic exhaust valve based on electromagnetic control, a mounting edge is provided on the outer wall of the inlet end of the inlet adapter tube, and is connected to the hydraulic system pipeline by bolts;

[0025] The inlet end of the inlet adapter cylinder extends into a mounting hole provided on the hydraulic system pipeline, and an annular sealing groove is arranged on the outer wall of the inner part of the mounting hole, and a sealing ring is installed in the annular sealing groove.

[0026] Optionally, in the above-mentioned automatic exhaust valve based on electromagnetic control, the valve head on the valve core is a conical structure;

[0027] There are multiple transverse flow holes distributed along the circumference of the valve core.

[0028] Optionally, in the above-mentioned automatic exhaust valve based on electromagnetic control, the electromagnet power supply socket is connected to the flight control system through an external electromagnet controller, and when the aircraft is in the power-on and self-inspection stage on the ground, the annular electromagnet is controlled to be energized; when the aircraft is in the air, or when there is no need to vent the hydraulic system, the annular electromagnet is controlled to be de-energized.

[0029] Optionally, in the above-mentioned automatic exhaust valve based on electromagnetic control, the adaptive exhaust structure further includes an inlet end retaining sleeve and an inlet end filter;

[0030] The inlet end retaining sleeve is arranged in the outlet end of the inlet adapter tube, and the inlet end filter screen is pressed onto the annular sealing protrusion;

[0031] The inlet end annular support seat is pressed on a step structure arranged outside the inlet end retaining sleeve.

[0032] Optionally, in the above-mentioned automatic exhaust valve based on electromagnetic control, the adaptive exhaust structure further includes a damping sleeve, which is arranged in the outlet end of the circulation head, with both ends abutting against a step structure arranged in the outlet end of the circulation head and in the inlet end of the outlet adapter tube, and has a damping film therein, and a damping hole on the damping film;

[0033] An annular sealing groove is arranged on the outer wall of the damping sleeve, and a sealing ring is installed in the annular sealing groove;

[0034] The adaptive exhaust structure also includes an outlet end retaining sleeve and an outlet end filter;

[0035] There are two groups of outlet end retaining sleeves and outlet end filter screens. The two outlet end retaining sleeves are arranged in the two ends of the damping sleeve and are pressed tightly against the step structure arranged in the outlet end of the circulation head and the inlet end of the outlet adapter tube, so as to press the two outlet end filter screens against the step structure arranged in the damping sleeve.

[0036] This application has at least the following beneficial technical effects:

[0037] Provided is an automatic exhaust valve based on electromagnetic control, which can be connected to an external electromagnetic controller through an electromagnetic power supply socket to control the power on and off of the annular electromagnetic, and conveniently control the automatic exhaust valve to be in an exhaust state and a closed state. The automatic exhaust valve is controlled to be in an exhaust state only when the hydraulic system needs to be exhausted, and can reliably prevent oil leakage when the aircraft is in the air and when the hydraulic system does not need to be exhausted, thereby affecting ground maintenance work and aircraft performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of an automatic exhaust valve based on electromagnetic control provided in an embodiment of the present application;

[0039] in:

[0040] 1-inlet adapter cylinder; 2-intermediate adapter cylinder; 3-outlet adapter cylinder; 4-annular electromagnet; 5-valve core; 6-valve core spring; 7-electromagnet power supply socket; 8-adaptive exhaust structure; 9-swimming block; 10-inlet end annular support seat; 11-outlet end annular support seat; 12-circulation head; 13-swimming block spring; 14-inlet end retaining sleeve; 15-inlet end filter; 16-damping sleeve; 17-outlet end retaining sleeve; 18-outlet end filter.

[0041] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be construed as limitations on the present application. DETAILED DESCRIPTION

[0042] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be described in further detail in detail and in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design.

[0043] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall have the usual meanings understood by those of ordinary skill in the art to which this application belongs. The words used in the description of this application to indicate orientation are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. The word "include" used in the description of this application indicates that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0044] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installation", "connection" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.

[0045] An automatic exhaust valve based on electromagnetic control, such as Figure 1 As shown, it includes an inlet adapter tube 1, an intermediate adapter tube 2, and an outlet adapter tube 3 which are connected in sequence, and an adaptive exhaust structure 8 is arranged in the channel formed by the inlet adapter tube 1, the intermediate adapter tube 2, and the outlet adapter tube 3.

[0046] The outlet end of the outlet adapter tube 3 can be bent 90 degrees to form a pipe joint for connecting the exhaust pipe.

[0047] Connecting edges may be provided between the inlet adapter tube 1, the intermediate adapter tube 2, and the outlet adapter tube 3, which are connected by bolts and positioned by means of a matching structure of an annular groove and an annular protrusion.

[0048] The inlet end outer wall of the inlet adapter tube 1 can be provided with a mounting edge, and then connected to the hydraulic system pipeline by bolts. The inlet end of the inlet adapter tube 1 extends into the mounting hole opened on the hydraulic system pipeline, and an annular sealing groove is provided on the outer wall of the inner part of the mounting hole, and a sealing ring is installed in the annular sealing groove.

[0049] An annular electromagnet 4 is arranged in the inlet end of the inlet adapter tube 1 , and an annular sealing protrusion is provided in the inlet adapter tube 1 .

[0050] A valve core 5 is arranged in the annular electromagnet 4, one end of the valve core 5 extends into the annular electromagnet 4, the end portion has an axial flow hole, the other end portion of the valve core 5 has a valve head, and the side wall of the end has a transverse flow hole. The valve head can be designed as a conical structure.

[0051] There can be multiple transverse flow holes, which are distributed along the circumference of the valve core 5 and communicated with the axial flow holes.

[0052] A valve core spring 6 is sleeved on the outer periphery of the valve core 5, and both ends of the valve core spring 6 abut between the annular electromagnet 4 and the valve head. The valve head abuts against the annular sealing protrusion by elastic force to block the middle hole of the annular sealing protrusion.

[0053] An electromagnet power supply socket 7 is arranged outside the imported adapter tube 1, which is connected to the annular electromagnet 4 through a line, and is connected to an external electromagnet controller, so as to control the power on and off of the annular electromagnet 4.

[0054] The electromagnet power supply socket 7 can be connected to the flight control system through an external electromagnet controller. When the aircraft is in necessary links such as power-on and self-inspection on the ground, the annular electromagnet 4 is controlled to be energized, so that the valve core 5 overcomes the elastic force of the valve core spring 6 and moves axially, so that the valve head is separated from the annular sealing protrusion, and the blockage of the middle hole of the annular sealing protrusion is released. At this time, the automatic exhaust valve based on electromagnetic control is in the exhaust state, and the gas in the hydraulic system can flow out through the axial flow holes and the transverse flow holes on the valve core 5, and then flow into the channel formed by the inlet adapter tube 1, the middle adapter tube 2, and the outlet adapter tube 3 through the middle hole of the annular sealing protrusion, and be discharged through the adaptive exhaust structure 8, and the adaptive exhaust structure 8 simultaneously intercepts the oil.

[0055] When the aircraft is in the air, or when there is no need to exhaust the hydraulic system, the annular electromagnet 4 can be powered off, so that the valve core 5 moves axially under the elastic force of the valve core spring 6, so that the valve head abuts against the annular sealing protrusion, and the sealing of the middle hole of the annular sealing protrusion is restored. At this time, the automatic exhaust valve based on electromagnetic control is in a closed state, and the gas and oil in the hydraulic system cannot be discharged, thereby reliably avoiding oil leakage, affecting ground maintenance work, and affecting aircraft performance.

[0056] The automatic exhaust valve based on electromagnetic control disclosed in the above embodiment can be connected to the flight control system through the electromagnet power supply socket 7 through the external electromagnet controller, and control the power on and off of the annular electromagnet 4, so as to conveniently control the automatic exhaust valve to be in the exhaust state and the closed state. Only when the hydraulic system needs to be exhausted, the automatic exhaust valve is controlled to be in the exhaust state, which can reliably prevent oil leakage when the aircraft is in the air and when the hydraulic system does not need to be exhausted, thereby affecting ground maintenance work and affecting aircraft performance.

[0057] The adaptive exhaust structure 8 includes a swimming block 9 , an annular support seat at the inlet end 10 , an annular support seat at the outlet end 11 , and a flow head 12 .

[0058] The inlet end annular support seat 10 is pressed against the step structure provided in the outlet end of the inlet adapter tube 1 by the inlet end of the intermediate adapter tube 2, and is positioned with the inlet end of the intermediate adapter tube 2 through the structure of annular groove and annular protrusion.

[0059] The flow head 12 is arranged on a step structure arranged in the inlet end of the outlet adapter cylinder 3 .

[0060] The outlet annular support seat 11 is pressed against the step structure provided on the circulation head 12 by the inlet end of the intermediate adapter tube 2, and is positioned with the outlet end of the intermediate adapter tube 2 by means of an annular groove and an annular protrusion matching structure.

[0061] The swimming block 9 is arranged in the intermediate transfer tube 2, and there is an air flow circulation annular gap between the swimming block 9 and the intermediate transfer tube 2. A swimming block spring 13 is arranged between the swimming block 9 and the circulation head 12. The swimming block spring 13 relies on its elastic force to make the swimming block 9 rest on the annular support seat 10 at the inlet end to maintain sealing.

[0062] When the electromagnetically controlled automatic exhaust valve disclosed in the above-mentioned embodiment is in the exhaust state, the airflow flowing out from the inlet adapter tube 1 enters the intermediate adapter tube 2, which can push the swimming block 9 to overcome the elastic force of the swimming block spring 13 and move axially, so that the swimming block 9 is separated from the annular support seat 10 at the inlet end, and the airflow can then flow out through the airflow circulation annular gap between the swimming block 9 and the intermediate adapter tube 2, and be discharged through the circulation head 12 and the outlet adapter tube 3. After the gas in the oil is exhausted, part of the oil will also enter the intermediate adapter tube 2 through the airflow circulation path. However, since the oil will produce a larger pressure drop and form a larger pressure difference when flowing through the airflow circulation annular gap relative to the airflow, the pressure difference will push the swimming block 9 to overcome the elastic force of the swimming block spring 13 and move further axially until it abuts against the annular support seat 11 at the outlet end, forming a seal, thereby cutting off the outflow of oil and avoiding oil leakage.

[0063] In order to facilitate the installation of the swimming block spring 13, the swimming block 9 may be designed to have a mounting hole at one end facing the outlet end annular support seat 11, and the swimming block spring 13 is arranged in the mounting hole.

[0064] In order to ensure the sealing effect when the swimming block 9 contacts with the annular support seat 10 at the inlet end and the annular support seat 11 at the outlet end, the annular support seat 10 at the inlet end and the annular support seat 11 at the outlet end can be designed to have a certain elasticity, and the two ends of the swimming block 9 are designed to have annular cutting edges. When the swimming block 9 abuts against the annular support seat 10 at the inlet end and the annular support seat 11 at the outlet end, the annular cutting edges can squeeze the annular support seat 10 at the inlet end and the annular support seat 11 at the outlet end to form a depression, thereby achieving a better sealing effect.

[0065] The adaptive exhaust structure 8 further includes an inlet end retaining sleeve 14 and an inlet end filter screen 15 .

[0066] The inlet end retaining sleeve 14 is arranged inside the outlet end of the inlet adapter tube 1, and the inlet end filter screen 15 is pressed on the annular sealing protrusion. The inlet end annular support seat 10 is pressed on the step structure arranged outside the inlet end retaining sleeve 14. The inlet end filter screen 15 allows airflow to pass through, and can partially block the outflow of oil and its impurities, so as to reduce the possibility of oil leakage and avoid clogging of the automatic exhaust valve.

[0067] The adaptive exhaust structure 8 also includes a damping sleeve 16, which is arranged in the outlet end of the circulation head 12, with both ends resting on a step structure arranged in the outlet end of the circulation head 12 and in the inlet end of the outlet adapter tube 3. The damping sleeve 16 has a damping membrane therein, and the damping membrane has damping holes, which can allow airflow to pass through and block oil from flowing out to reduce the possibility of oil leakage.

[0068] An annular sealing groove is provided on the outer wall of the damping sleeve 16, and a sealing ring is installed in the annular sealing groove.

[0069] The adaptive exhaust structure 8 further includes an outlet end retaining sleeve 17 and an outlet end filter screen 18 .

[0070] There are two groups of outlet holding sleeves 17 and outlet filter screens 18. The two outlet holding sleeves 17 are arranged at both ends of the damping sleeve 16, and are pressed against the step structure arranged in the outlet end of the flow head 12 and the inlet end of the outlet adapter tube 3, and the two outlet filter screens 18 are pressed against the step structure arranged in the damping sleeve 16. The two outlet filter screens 18 can allow airflow to pass through, and at the same time can block the oil from flowing out, so as to reduce the possibility of oil leakage.

[0071] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.

Claims

1. An automatic exhaust valve based on electromagnetic control, characterized in that: It comprises an inlet adapter tube (1), an intermediate adapter tube (2), and an outlet adapter tube (3) which are connected in sequence, and an adaptive exhaust structure (8) is arranged in the channel formed by the inlet adapter tube (1), the intermediate adapter tube (2), and the outlet adapter tube (3); An annular electromagnet (4) is arranged inside the inlet end of the inlet adapter tube (1), and an annular sealing protrusion is provided inside the inlet adapter tube (1); A valve core (5) is arranged in the annular electromagnet (4), one end of the valve core (5) extends into the annular electromagnet (4), the end portion of the valve core (5) has an axial flow hole, the other end portion of the valve core (5) has a valve head, and the side wall of the end portion has a transverse flow hole connected to the axial flow hole; A valve core spring (6) is sleeved around the outer periphery of the valve core (5), and both ends of the valve core spring (6) are pressed against between the annular electromagnet (4) and the valve head, and the valve head is pressed against the annular sealing protrusion by elastic force, thereby sealing the middle hole of the annular sealing protrusion; An electromagnet power supply socket (7) is arranged outside the imported adapter tube (1), connected to the annular electromagnet (4) through a line, and connected to an external electromagnet controller to control power on and power off of the annular electromagnet (4); The adaptive exhaust structure (8) comprises a swimming block (9), an inlet end annular support seat (10), an outlet end annular support seat (11), and a flow head (12); The inlet end annular support seat (10) is pressed against the step structure provided in the outlet end of the inlet adapter tube (1) by the inlet end of the intermediate adapter tube (2), and is positioned with the inlet end of the intermediate adapter tube (2) by means of a matching structure of an annular groove and an annular protrusion; The flow head (12) is arranged on a step structure arranged in the inlet end of the outlet adapter cylinder (3); The outlet end annular support seat (11) is pressed against the step structure provided on the circulation head (12) by the inlet end of the intermediate adapter tube (2), and is positioned with the outlet end of the intermediate adapter tube (2) by means of a matching structure of an annular groove and an annular protrusion; The swimming block (9) is arranged in the intermediate transfer tube (2), and an airflow circulation annular gap is formed between the swimming block (9) and the intermediate transfer tube (2). A swimming block spring (13) is arranged between the swimming block (9) and the circulation head (12). The swimming block spring (13) relies on its elastic force to make the swimming block (9) abut against the annular support seat (10) at the inlet end; One end of the swimming block (9) facing the outlet end annular support seat (11) has a mounting hole, and the swimming block spring (13) is arranged in the mounting hole; The inlet end annular support seat (10) and the outlet end annular support seat (11) are elastic, and both ends of the swimming block (9) are designed to have annular cutting edges.

2. The automatic exhaust valve based on electromagnetic control according to claim 1, characterized in that: The outlet end of the outlet adapter tube (3) is bent 90 degrees to form a pipe joint for connecting to an exhaust pipe.

3. The automatic exhaust valve based on electromagnetic control according to claim 1, characterized in that: A connecting edge is provided between the inlet adapter tube (1), the intermediate adapter tube (2), and the outlet adapter tube (3), which are connected by bolts and positioned by means of a matching structure of an annular groove and an annular protrusion.

4. The automatic exhaust valve based on electromagnetic control according to claim 1, characterized in that: The inlet end outer wall of the inlet adapter tube (1) is provided with a mounting edge, which is connected to the hydraulic system pipeline by bolts; The inlet end of the inlet adapter tube (1) extends into a mounting hole provided on the hydraulic system pipeline, and an annular sealing groove is provided on the outer wall of the inner part of the mounting hole, and a sealing ring is installed in the annular sealing groove.

5. The automatic exhaust valve based on electromagnetic control according to claim 1, characterized in that: The valve head on the valve core (5) is a conical structure; There are a plurality of transverse flow holes, which are distributed along the circumference of the valve core (5).

6. The automatic exhaust valve based on electromagnetic control according to claim 1, characterized in that: The electromagnet power supply socket (7) is connected to the flight control system through an external electromagnet controller, and when the aircraft is in the ground power-on and self-checking stage, the annular electromagnet (4) is controlled to be energized; when the aircraft is in the air, or when it is not necessary to exhaust the hydraulic system, the annular electromagnet (4) is controlled to be de-energized.

7. The automatic exhaust valve based on electromagnetic control according to claim 1, characterized in that: The adaptive exhaust structure (8) further includes an inlet end retaining sleeve (14) and an inlet end filter screen (15); The inlet end retaining sleeve (14) is arranged in the outlet end of the inlet adapter tube (1) to press the inlet end filter screen (15) onto the annular sealing protrusion; The inlet end annular support seat (10) is pressed onto a step structure arranged outside the inlet end retaining sleeve (14).

8. The automatic exhaust valve based on electromagnetic control according to claim 7, characterized in that: The adaptive exhaust structure (8) further comprises a damping sleeve (16), the damping sleeve (16) being arranged in the outlet end of the circulation head (12), with two ends abutting against a step structure arranged in the outlet end of the circulation head (12) and in the inlet end of the outlet adapter tube (3), the damping sleeve (16) having a damping film therein, and having a damping hole on the damping film; An annular sealing groove is provided on the outer wall of the damping sleeve (16), and a sealing ring is installed in the annular sealing groove; The adaptive exhaust structure (8) further includes an outlet end retaining sleeve (17) and an outlet end filter screen (18); There are two groups of outlet end retaining sleeves (17) and outlet end filter screens (18). The two outlet end retaining sleeves (17) are arranged at both ends of the damping sleeve (16) and are pressed against a step structure arranged in the outlet end of the flow head (12) and in the inlet end of the outlet adapter cylinder (3), so that the two outlet end filter screens (18) are pressed against the step structure arranged in the damping sleeve (16).

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