Suction device with throttle valve and method for cleaning a filter in such a suction device

Description

[0001] The present invention relates to a vacuum device comprising a dirt collection container, a filter, and a vacuum motor. During vacuuming operation, the vacuum device generates a suction flow by means of the vacuum motor, which flows from the dirt collection container through the filter towards the vacuum motor. The vacuum device is configured to clean the filter during continuous vacuuming operation by generating a backwash flow R from a clean side of the filter towards a dirty side of the filter. The vacuum device includes a throttle valve, the throttle valve being located on a dirty side of the filter and configured to throttle the suction flow S, thereby increasing the backwash flow R.In a second aspect, the invention relates to a method for cleaning a filter in a vacuum cleaner, wherein filter cleaning is carried out during continuous vacuuming operation of the vacuum cleaner by generating a backwash flow from a clean side of the filter towards a dirty side of the filter, wherein throttling of the suction flow by a throttle valve leads to an increase in the backwash flow. The throttle valve can advantageously be used to adjust the cross-section of a flow channel in the vacuum cleaner and / or the pressure on a dirty side of a filter of the vacuum cleaner. Background of the invention:

[0002] In the field of industrial vacuum cleaners, devices are known that can vacuum up both liquid and solid materials. Such vacuum cleaners are commonly referred to as wet / dry vacuums. The solid materials can include, for example, dust, drilling dust, or demolition debris. The liquid material can be cooling or rinsing water, which, together with the solid material, can form a sludge-like mass. A vacuum cleaner is typically used in conjunction with a machine tool that generates dust or drilling dust. The dust-generating process performed by the machine tool is preferably referred to as the "application" within the meaning of the invention.

[0003] Furthermore, in the field of industrial vacuum cleaners, there are devices known that can only vacuum solid materials. Both types of vacuum cleaners typically have a dirt collection container, a filter, a motor, and a turbine, with the turbine being driven by the motor. The airflow generated by the turbine's rotation draws in the solid and / or liquid material. The vacuum cleaner is conveniently equipped with a suction hose to which a nozzle or power tool can be attached. The dirt collection container serves to hold the vacuumed material until it is emptied. The dirt collection container may, in particular, have a suction opening for connecting a suction hose. The filter is designed to separate or isolate the material present in the airflow.This separation of airflow and the material being vacuumed is preferably referred to as "filtering" or "filtration" within the meaning of the invention. The filter is typically arranged between the dirt collection container and the motor. Within the meaning of the invention, the side of the filter facing the dirt collection container is referred to as the first side or the dirty side of the filter, while the side of the filter facing the vacuum motor is referred to as the second side or the clean side of the filter. During vacuuming operation, the airflow typically flows from the dirt collection container towards the vacuum motor, i.e., from the dirty side of the filter towards the clean side.

[0004] The material sucked up by the vacuum cleaner either accumulates in the dirt collection container or becomes trapped in the vacuum cleaner's filter. An accumulation of material in the filter area can lead to the formation of a solid filter cake, which can significantly increase the flow resistance caused by the filter. This flow resistance slows down or restricts the suction airflow used to draw in the material, and can thus adversely reduce the vacuum cleaner's suction power. To avoid such an undesirable reduction in suction power, vacuum cleaner filters are cleaned regularly. This cleaning of a vacuum cleaner filter is referred to as "filter cleaning" within the meaning of the invention.

[0005] Various methods for filter cleaning have been proposed in the prior art. For example, backflushing solutions are known in which the direction of the airflow is reversed. This causes the airflow to flow briefly from the clean side of the filter towards its dirty side. To enable this reversal of the flow direction, the pressure in the suction device on the clean side of the filter is increased, preferably to a level higher than the pressure level on the dirty side of the filter. The efficiency of the filter cleaning depends in particular on the pressure difference between the dirty side and the clean side of the filter. A small pressure difference between the dirty and clean sides of the filter in the suction device can lead to low filter cleaning efficiency, so that the filter may not be cleaned optimally.This can negatively lead to a permanently reduced suction power of the vacuum cleaner, causing vacuuming tasks to take longer and requiring more personnel. Furthermore, the intervals at which the vacuum cleaner's filter needs to be replaced to guarantee or maintain a certain level of suction power may be shortened.

[0006] For example, DE 690 23 165 T2 discloses a remote control device for extraction or ventilation systems comprising a chamber, a driven extraction blower and at least one pipeline.

[0007] EP 3 827 724 A1 discloses an extraction system comprising a central extraction system, a plurality of suction points fluidically connected to the extraction system, each with a throttle valve at each suction point and with a means for manually adjusting the throttle valve.

[0008] DE 20 2021 001444 U1 describes a vacuum cleaner with a pipe extension that can be used as a collection tube for capturing, observing, studying and releasing insects.

[0009] DE 10 2015 108 559 A1 discloses a backwashable air filter, in particular for a vacuum cleaner, with a filter element separating a clean air chamber from a vacuuming chamber, wherein the vacuum cleaner can be operated in filter mode or in backwash mode.

[0010] US 2017 151 524 A1 describes a system and a procedure for backflushing a vacuum cleaner filter.

[0011] The object underlying the present invention is to overcome the above-described shortcomings and disadvantages of the prior art and to provide a suction device and a method for filter cleaning with which the efficiency of filter cleaning can be improved and optimized.

[0012] The problem is solved by the subject matter of the independent claims. Advantageous embodiments relating to the subject matter of the independent claims are found in the dependent claims. Description of the invention:

[0013] According to the invention, a vacuum device is provided comprising a dirt collection container, a filter, and a vacuum motor. During vacuuming operation, the vacuum motor generates a suction flow that flows from the dirt collection container through the filter towards the vacuum motor. The vacuum device is configured to clean the filter during continuous vacuuming operation by generating a backwash flow R from a clean side of the filter towards a dirty side. The vacuum device includes a throttle valve, which is located on a dirty side of the filter and is configured to throttle the suction flow S, thereby increasing the backwash flow R. It is particularly preferred, according to the invention, that the throttle valve is arranged within the suction flow.This allows the suction flow to be adjusted and regulated, in particular throttled, through the throttle valve. For the purposes of the invention, the throttle valve is preferably also referred to as a "throttle," with the terms preferably being used synonymously.

[0014] The suction device can comprise a suction head in an upper section and a dust collection container in a lower section. An inlet opening can be provided in the lower section of the suction device, particularly in the area of ​​the dust collection container. A suction hose can be connected to this inlet opening, and the suction flow S is drawn into the suction device through this hose. A machine tool, which generates dust during operation, can be positioned at the front of the suction hose. This dust can be extracted by the proposed suction device through the suction hose. The rear end of the suction hose can open into the dust collection container of the suction device through the inlet opening, allowing the extracted dust-air mixture to be drawn into the dust collection container.The filter of the vacuum unit is preferably oriented with its dirty side facing the dust collection container, while the clean side of the filter preferably faces the upper part of the vacuum unit and may be oriented towards the vacuum motor. The throttle valve is preferably located on the dirty side of the filter and positioned within the suction flow. Advantageously, the provision of the throttle valve on the dirty side of the vacuum unit's filter enables dynamic control and regulation of the filter cleaning process, whereby the filter cleaning process can be optimized by the throttle valve, particularly with regard to its duration, quality, and timing. In particular, the use of a throttle valve in the flow path through the vacuum unit allows for a particularly demand-oriented cleaning of the filter, in that the filter cleaning can be adapted to different applications and connected machine tools.This can be achieved, for example, by defining design points that can be controlled depending on the application or connected machine tool. In particular, the pressure conditions in the suction unit can be adjusted by the throttle valve to ensure particularly efficient filter cleaning.

[0015] In accordance with the invention, it is preferred that the cleaning process of the vacuum cleaner is carried out by backflushing the filter. Ambient air is admitted into the vacuum cleaner on the clean side of the filter, causing the pressure in the vacuum cleaner, particularly on the clean side of the filter, to rise, preferably abruptly. The admission of ambient air on the clean side of the filter can preferably be effected by valves that close or open a further inlet opening. Due to the preferably abrupt increase in pressure caused by the incoming ambient air, the pressure on the clean side of the vacuum cleaner briefly becomes higher than the pressure in the dust collection container, i.e., on the dirty side of the filter. In this way, a backflush flow is advantageously created through the filter, with the backflush flow flowing from the clean side towards the dirty side of the filter and thereby cleaning the filter.The backflushing can be maintained, in particular, until similar pressure conditions prevail on the clean side of the filter and in the dust collection container, i.e., until the pressures have equalized. It is preferred, according to the invention, that the ambient air entering the vacuum unit through the opening of the valve acts directly on the filter and generates the backflushing flow. However, it may also be preferred, according to the invention, that the incoming ambient air acts indirectly on the filter in such a way that pistons or diaphragms transfer the incoming airflow to the filter, so that the filter itself does not come into contact with the incoming, unfiltered ambient air. Pistons or diaphragms can generate and push an air cushion, whereby this air cushion can generate a backflushing flow that then flows through the filter from the clean side towards the dirty side, thereby cleaning the filter.

[0016] This cleaning process can be supported by the provision of a throttle valve, which restricts the suction flow. The throttle valve is preferably arranged in the suction flow upstream of the dust collection container and is designed to control, and in particular increase, the negative pressure in the dust collection container shortly before or during filter cleaning. In the context of the invention, the phrase "increase in negative pressure" preferably means that the pressure in the dust collection container decreases (further). Therefore, an increase in negative pressure, as defined in the invention, can preferably also be referred to as a pressure drop. By increasing the negative pressure, the pressure difference between the clean side of the filter on the one hand and the dust collection container on the other can advantageously increase, thus generating a particularly strong backwash flow through the filter of the vacuum cleaner.

[0017] The throttle valve is designed to throttle the suction flow. The term "throttle" is used within the meaning of the invention to mean "continuous switching." It is preferred within the meaning of the invention that the throttle valve is essentially continuously switchable. This preferably means, within the meaning of the invention, that the throttle can be not only fully open (100% opening) or fully closed (0% opening), but preferably also any intermediate stage, i.e., preferably stepless opening degrees between 0 and 100%. The throttle can preferably not only switch binary between the settings "open" and "closed," but also assume intermediate stages to allow, for example, opening degrees of the suction device's inlet opening of 15%, 20%, 25%, 33.3%, 43.6%, 50%, 67%, 75%, etc.The present invention differs from solutions in which the suction flow is completely interrupted by the ability of the throttle valve not only to completely interrupt or allow unrestricted passage of the suction flow, but also to throttle it in the sense of a "continuous switching".

[0018] The throttle valve or its degree of opening can preferably be controlled by a central control unit of the suction device, wherein this central control unit of the suction device is preferably designed to control the entire cleaning process.

[0019] It is preferred, according to the invention, that the throttle valve can be manually actuated or that it can be electrically activated. It is particularly preferred, according to the invention, that the entire cleaning process can be initiated manually, i.e., started, for example, by an operation of the vacuum cleaner. Preferably, this manual start of the cleaning process can also actuate the throttle valve, resulting in a brief reduction of the suction flow. With such global control of the cleaning process by a central control unit, the throttle can be opened or closed during the cleaning process, thus eliminating the need for separate actuation of the throttle valve. The control of the cleaning process can preferably be carried out by the central control unit of the vacuum cleaner.When the throttle is operated manually, a user of the suction device manually closes the throttle valve, so that the suction flow into the suction device can be temporarily reduced.

[0020] Typical throttling times can range from 10 to 150 ms. Of course, other throttling times are also possible, for example up to 200 or 300 ms, as well as all intermediate values.

[0021] The dirty side of the filter is preferably the side that becomes clogged with dirt and dust during operation of the vacuum cleaner. The dirty side preferably faces the dirt collection container and the inlet opening of the vacuum cleaner. Preferably, the filter of the vacuum cleaner is located in a flow channel or flow path that runs from the inlet opening, through the dirt collection container, through the filter, and towards the vacuum cleaner's motor. During operation, the suction flow generated by the vacuum motor flows through this flow channel or flow path. The vacuum motor may include a turbine or a compressor. By increasing the negative pressure on the dirty side of the filter, the pressure differential between the dirty and clean sides of the filter can advantageously be increased, thereby improving the efficiency of the filter cleaning process.The greater pressure differential between the dirty and clean sides of the filter advantageously allows for a stronger backwash flow through the filter, enabling more thorough and efficient cleaning. A further advantage of incorporating a throttle in the flow channel of a vacuum cleaner is that filter cleaning can occur while the vacuum cleaner continues to operate. This allows for particularly efficient operation of the proposed vacuum cleaner, enabling vacuuming tasks to be completed quickly and with minimal personnel. In particular, it eliminates unwanted work interruptions that would otherwise be necessary for filter cleaning.

[0022] The cleaning of the vacuum cleaner's filter can be further improved by using an electrically activated and, in particular, controllable throttle valve instead of a manually operated one. The manually operated throttle valve can impair suction performance during operation if the suction flow is interrupted for too long. If the suction flow is weakened for too long, the negative pressure in the dust container during operation can drop too drastically, making it difficult and costly to restore the negative pressure after filter cleaning is complete. The electrically activated throttle valve, on the other hand, can be regulated and / or controlled with high dynamics, allowing the amount of incoming suction flow through the at least one inlet opening into the vacuum cleaner to be adjusted as needed.In particular, the pressure on the dirty side of the suction device's filter can be adjusted by providing an adjustable, preferably electrically actuated, throttle valve. Furthermore, the cross-section of the flow channel between the inlet opening and the suction motor can be adjusted with particular precision and according to requirements using an electrically actuated throttle. The advantages of the invention and the associated adjustability of the filter cleaning efficiency lie in the fact that the quality of the filter cleaning is, for example, independent of the suction hose used or its diameter. Tests have shown that the filter cleaning efficiency achieved with the invention is also independent of the application or the machine tool in which the proposed suction device with throttle valve is used.In other words, the quality of the filter cleaning advantageously does not depend on the connected machine tool or the dust-generating work ("application") performed with it, but rather the quality of the filter cleaning can be adjusted using the throttle valve. This advantage is particularly pronounced when an electrically activated, and therefore controllable and adjustable, throttle valve is used in the suction operation.

[0023] In particular, the throttle allows the pressure drop in the dust collection container of the vacuum cleaner to be adjusted. Advantageously, the throttle optimally resolves the conflicting objectives during vacuuming operation, where a significant pressure drop is desirable for efficient filter cleaning, but can also impair the suction power of the vacuum cleaner. An electrically activated throttle, in particular, enables very finely adjustable regulation and / or control of the suction flow and / or pressure drop, allowing the pressure or pressure drop on the dirty side of the filter to be set to ensure optimal filter cleaning. Tests have also shown that the throttle allows for particularly precise timing of the filter cleaning process.In other words, filter cleaning can be optimally scheduled during the operation of the vacuum cleaner, ensuring both optimal filter cleaning and minimal disruption to the vacuum cleaner's operation.

[0024] It is preferred, according to the invention, that the throttle is arranged in the region of the at least one inlet opening in the area of ​​the dirt collection container, whereby the suction flow can enter the vacuuming device through the inlet opening. The inlet opening can, for example, be an opening for the suction hose. By providing the throttle valve in the region of the inlet opening of the vacuuming device, the invention differs from solutions in which valves or throttle valves are arranged in other areas of a vacuuming device or the suction hose. Preferably, in the context of the present invention, the throttle is located in the transition area between the suction hose and the vacuuming device. The invention is based on the idea that the throttle is arranged in the suction flow and on the dirt side of the filter of the vacuuming device so that the suction flow can be throttled, i.e., preferably continuously adjusted, by means of the throttle.

[0025] The throttle valve can preferably also be arranged between the at least one inlet opening and the filter, so that it is located, in particular, on the dirty side of the filter of the suction device. By providing the throttle in the suction flow on the dirty side of the filter, the throttle valve can be used, in particular, to adjust the pressure or pressure drop on this dirty side of the filter and thus optimize the efficiency of the filter cleaning by setting an optimal pressure differential between the dirty and clean sides of the filter.

[0026] Setting the optimal pressure differential can be achieved, in particular, by configuring the throttle valve to adjust the cross-section of a flow channel in the suction device. Preferably, the throttle valve can be configured to adjust the cross-section of the flow channel within a range between 0 and 100%. In other words, the throttle valve can not only switch between the positions "open" (essentially 100% opening of the inlet and essentially 100% opening of the flow channel) and "closed" (essentially 0% opening of the inlet and essentially 0% opening of the flow channel), but also allows for fine adjustment of intermediate opening degrees. This enables particularly precise and preferably stepless regulation and adjustment of the suction flow, pressure, or pressure drop.This is made possible by the pressure difference between the dirty and clean sides of the filter. For example, the throttle valve can be opened by 17%, 20%, 25%, 33.3%, 46.4%, or any other percentage value between 0 and 100%.

[0027] It is preferred, according to the invention, that the throttle valve is configured to set a pressure on the dirty side of the vacuum cleaner's filter. In particular, the negative pressure on the dirty side of the filter can be increased by briefly throttling the suction flow before and / or during filter cleaning. This preferably means, according to the invention, that the absolute pressure on the dirty side of the filter drops or is reduced briefly. By throttling the suction flow, the pressure on the dirty side of the vacuum cleaner's filter can advantageously be controlled or regulated. In particular, the pressure on the dirty side of the vacuum cleaner's filter can be influenced by varying or changing the flow rate through the at least one inlet opening.

[0028] In a second aspect, the invention relates to a method for cleaning a filter in a proposed vacuum cleaner. The terms, definitions, and technical advantages introduced for the vacuum cleaner preferably apply analogously to the filter cleaning method. The filter cleaning method is characterized by the following process steps: a) Operation of the suction device in suction mode, b) Performing filter cleaning during continued suction operation by generating a backwash flow from a clean side of the filter towards a dirty side of the filter, c) Throttle of a suction flow by a throttle valve to increase the backwash flow.

[0029] A significant advantage of the invention is that filter cleaning can be carried out while the vacuuming operation of the device continues. In particular, simultaneous cleaning of the at least one filter of the vacuuming device is possible during continued operation. This allows for particularly quick and uninterrupted operation of the proposed vacuuming device.

[0030] It is preferred according to the invention that the throttle valve is manually operated or electrically activated. Furthermore, the cross-section of a flow channel in the suction device can be adjusted by the throttle valve within a range between 0 and 100%. This advantageously also makes it possible to adjust the pressure on a dirty side of a filter of the suction device by means of the throttle valve.

[0031] Advantageously, the proposed method enables dynamic control and regulation of the filter cleaning process, with the throttle optimizing the filter cleaning, particularly with regard to its duration, quality, and timing. In particular, the invention allows for highly customized filter cleaning, enabling the filter cleaning process to be adapted to different applications and connected machine tools.

[0032] Further advantages arise from the following description of the figures. The figures, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0033] In the figures, identical and similar components are numbered with the same reference symbols. They show: Fig. 1 View of a preferred embodiment of a suction device in suction operation. Fig. 2 View of a preferred embodiment of a suction device during filter cleaning. Examples of implementation and description of figures:

[0034] Figure 1Figure 1 shows a preferred embodiment of a suction device 1 in suction operation. The suction device 1 comprises a dirt collection container 2, a filter 3, and a suction motor 4. The suction motor 4 can include a turbine 5, which is driven by the suction motor 4 to generate a suction flow S. Technically, the turbine 5 acts as a compressor, drawing in air to generate the suction flow S. The suction flow S is used to vacuum up dust, dirt, or a liquid mixture of water and dirt. The suction flow S flows within the suction device 1 in a flow channel or flow path, which is also designated by the reference numeral S. The suction device 1 has an inlet opening 9, and the suction flow S or flow path S preferably forms between the inlet opening 9 and the suction motor 4 or the turbine 5.The inlet opening 9 is preferably located in the dirt collection container 2 of the vacuum cleaner 1. A filter 3 is arranged between the inlet opening 9 and the vacuum motor 4. This filter 3 is designed to filter dirt and dust from the suction flow S to prevent contamination of the vacuum motor 4. The filter 3 has a dirty side 7, which preferably faces the dirt collection container 2, and a clean side 8, which faces the vacuum motor 4 and the vacuum cleaner head. For the purposes of this invention, the term "dirty side 7" refers not only to the corresponding side of the filter 3, but preferably also to the area of ​​the flow path S between the filter 3 and the inlet opening 9. The phrases "on the dirty side" and "between the filter 3 and the inlet opening 9" are preferably to be understood synonymously for the purposes of this invention.During operation of the vacuuming device 1, the suction flow S flows from the dirty side 7 towards the clean side 8 through the filter 3, whereby dust and dirt are filtered out of the suction flow S as they pass through the filter 3. This direction of the suction flow S from the dirty side 7 towards the clean side 8 is described in . Fig. 1 represented by the arrows marked with the reference symbol S.

[0035] The filter 3 can become clogged or blocked with a filter cake during operation of the vacuum cleaner 1, which can reduce the suction power of the vacuum cleaner 1. In this case, it is necessary to perform a so-called filter cleaning, i.e., cleaning of the filter 3 of the vacuum cleaner 1. In the context of the present invention, this filter cleaning is carried out by backflushing, i.e., a brief reversal of the direction of the suction flow S. During this backflushing, the filter 3 is flushed with a backflushing flow R, which flows from the clean side 8 of the filter 3 towards its dirty side 7. The backflushing flow R is Fig. 2The backwash flow R can be generated by opening a further inlet opening 11 of the suction device 1, wherein this further inlet opening 11 is preferably located in the upper region of the suction device 1 or in the head of the suction device 1 ("suction device head"). The further inlet opening 11 can, for example, be opened or closed by a valve (not shown). When the valve is opened, ambient air 10 can flow into the suction device 1 through the further inlet opening 11 and act directly or indirectly on the filter 3.

[0036] The suction device 1 has a throttle valve 6, which is preferably arranged in the area of ​​the inlet opening 9 in the dirt collection container 2 of the suction device 1. The throttle valve 6 is particularly located in the suction flow S. The throttle valve 6 can be used to fully or partially open or close the at least one inlet opening 9 of the suction device 1. In particular, the inlet opening 9 of the suction device 1 can be opened or closed continuously, so that the suction flow S can preferably be continuously adjusted, and in particular throttled, by the throttle valve 6.

[0037] During operation of the vacuuming device 1, a negative pressure is created inside the device. This negative pressure is responsible for generating the suction flow S, which allows dust, dirt, and drilling sludge to be drawn into the vacuuming device 1. For this purpose, the vacuuming device 1 can be connected to a suction hose (not shown), which preferably enters the vacuuming device 1 in the area of ​​the inlet opening 9. To clean the filter 3, a pressure differential must be created between the dirty side 7 and the clean side 8 of the filter 3 to generate a backwash flow R. Specifically, the pressure on the clean side 8 of the filter 3 is increased and the pressure on the dirty side 7 of the filter 3 is reduced, so that the backwash flow R can flow from the clean side 8 towards the dirty side 7 of the filter 3.According to the invention, the pressure reduction on the dirty side 7 of the filter 3 is achieved in particular by reducing the cross-section of the suction flow S through the at least one inlet opening 9 in the dirt collection container 2 of the vacuum device 1, thus throttling the suction flow S itself. The throttle valve 6 is used in particular for throttling the suction flow S, and the throttle valve 6 can preferably be operated manually or electrically. Particularly preferred in the context of the present invention is an electrically activatable throttle valve that is adjustable or controllable in such a way that the flow rate of suction flow S through the inlet opening 9 can be regulated by the throttle valve 6. This allows the pressure drop on the dirty side 7 of the filter 3 of the vacuum device 1 to be adjusted, as well as the pressure differential between the dirty side 7 and the clean side 8 of the filter 3, and the resulting quality of the filter cleaning.The throttle valve 6 is specifically designed to control a cross-sectional area Q (see . Fig. 1 ) of the suction channel S to be adjusted.

[0038] The suction device 1 can have a central control unit 12 with which the cleaning process of the at least one filter 3 of the suction device 1 can be controlled. In addition, the suction device 1 can have a further inlet opening 11 through which ambient air 10 can flow into the suction device 1. This allows a backwash flow R to be generated for cleaning the at least one filter 3 of the suction device 1. Reference symbol list

[0039] 1. Vacuum cleaner 2. Dirt collection container 3. Filter 4. Vacuum motor 5. Turbine 6. Throttle valve 7. Dirty side 8. Clean side 9. Inlet opening 10. Ambient air 11. Inlet opening in vacuum cleaner head 12. Central control unit S. Suction flow / flow channel Q. Cross-section

Claims

1. Suction device (1) having a dirt collection container (2), a filter (3) and a suction motor (4), wherein a suction flow S is generated by means of the suction motor (4) in a suction mode of the suction device (1), said suction flow S flowing from the dirt collection container (2) through the filter (3) in the direction of the suction motor (4), wherein the suction device (1) is designed to carry out dedusting of the filter (3) while the suction mode of the suction device (1) is in progress, by a backflushing flow R being generated from a clean side (8) of the filter (3) in the direction of a dirty side (7) of the filter (3), characterized in that the suction device (1) comprises a throttle valve (6) which is provided on a dirty side (7) of the filter (3) and is designed to throttle the suction flow S such that the backflushing flow R is intensified by the throttling of the suction flow S.

2. Suction device (1) according to Claim 1, characterized in that the throttle valve (6) is actuable manually or is activatable electrically.

3. Suction device (1) according to either of the preceding claims, characterized in that the throttle valve (6) is arranged between an inlet opening (9) of the suction device (1) and the filter (3).

4. Suction device (1) according to one of the preceding claims, characterized in that the throttle valve (6) is arranged in a region of the inlet opening (9) of the suction device (1).

5. Suction device (1) according to one of the preceding claims, characterized in that the throttle valve (6) is arranged in the suction flow S.

6. Suction device (1) according to one of the preceding claims, characterized in that the throttle valve (6) is designed to adjust a cross section Q of the suction flow S in the suction device (1).

7. Suction device (1) according to Claim 6, characterized in that the throttle valve (6) is designed to adjust the cross section Q of the suction flow S in a range between 0 and 100%.

8. Suction device (1) according to one of the preceding claims, characterized in that the throttle valve (6) is designed to adjust a pressure on a dirty side (7) of the filter (3) of the suction device (1).

9. Suction device (1) according to one of the preceding claims, characterized in that the suction device (1) has a central control unit (12) for controlling dedusting of the filter (3).

10. Method for dedusting a filter (3) in a suction device (1) according to one of the preceding claims, characterized by the following method steps: a) operating the suction device (1) in a suction mode, b) carrying out dedusting of the filter (3) while the suction mode is in progress, by a backflushing flow R being generated from a clean side (8) of the filter (3) in the direction of a dirty side (7) of the filter (3), c) throttling a suction flow S by a throttle valve (6) to intensify the backflushing flow R.

11. Method for dedusting a filter (3) according to Claim 10, characterized in that the throttle valve (6) is actuated manually or the throttle valve (6) is activated electrically.

12. Method for dedusting a filter (3) according to either of Claims 10 and 11, characterized in that a cross section Q of a suction flow S in the suction device (1) is adjusted by the throttle valve (6) in a range between 0 and 100%.

13. Method for dedusting a filter (3) according to one of Claims 10 to 12, characterized in that a pressure on the dirty side (7) of a filter (3) of the suction device (1) is adjusted by the throttle valve (6).