Circuit control system applied to air filter backflush device and device using same

Abstract

The application discloses a circuit control system applied to an air filtering backflush device and an air filtering backflush device. The air filtering backflush device comprises a first air filtering unit, a gas storage tank and a release valve. A ventilation end of the first cylinder is provided with a first gas outlet, the gas storage tank is communicated with the first containing space through the first gas outlet, and the release valve is used for being provided with a valve state to open / close a pipeline from the gas storage tank to the first gas outlet. The circuit control system comprises a first flow sensor communicated with the first gas outlet, a first pressure sensor arranged in the gas storage tank, a regulating valve arranged between the gas storage tank and a main gas pipe and a controller in communication connection with the first flow sensor, the first pressure sensor and the regulating valve. Thus, the controller can detect dirtiness of a filter core by using the first flow sensor to start self-cleaning, and control the gas pressure of the gas storage tank to be in a range according to feedback of the first pressure sensor, so that good protection of the filter core is considered, the service life of the filter core is prolonged, and the product competitiveness is improved.

Description

Technical Field

[0001] This disclosure relates to the field of air filtration technology for engineering equipment, and more particularly to a circuit control system and device for use in air filtration backflushing devices. Background Technology

[0002] The air filters of engineering equipment mainly adopt a combination of intake duct centrifugal filtration (or pre-filtration of mixed air) and two-stage dry filtration technology. The filters are maintained to ensure normal operation by regularly replacing the old air filters or periodically removing the old air filters and cleaning them with compressed air. This ensures the cleanliness of the air intake system of the engine and the normal operation of air-using equipment and the engine.

[0003] In current air filtration devices, some adopt a multi-stage air filter unit structure, while others use high-pressure airflow to achieve self-cleaning of the air filter unit. However, these solutions are designed primarily with the air filtration effect in mind, while ignoring the fact that the air filter unit may be made of relatively fragile materials, such as paper. Inappropriate airflow may damage the filter unit; that is, there is a lack of protective measures. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this disclosure is to provide a circuit control system and an apparatus for use in an air filter backflushing device, thereby solving the problems in the related art.

[0005] This disclosure provides a circuit control system for an air filter backflushing device, which supplies air filtration for engines used in engineering equipment. The air filter backflushing device includes: a first air filter unit, an air tank, and a release valve. The first air filter unit includes a first cylinder. The first cylinder includes: a first closed end and a first venting end opposite to each other, and a first accommodating space between the first closed end and the first venting end. The first cylinder contains an annular first filter element with its two ends respectively abutting the first closed end and the first venting end. The venting end of the first cylinder has a first air outlet located within the annulus of the first filter element. The air tank is connected to the first accommodating space via the first air outlet. The air pressure inside the air tank is higher than the air pressure in the first accommodating space. The release valve is configured to be in a valve state to open / close the pipeline from the air tank to the first air outlet, releasing air when the pipeline is open. The dust removal airflow originates from the gas storage tank, passes through the first outlet, and reaches the first filter element. The circuit control system includes: a first flow sensor, configured to be connected to the first outlet, for detecting the airflow rate at the first outlet and outputting a first flow signal; wherein the gas storage tank is connected to the main gas tank of the engineering equipment via a pipeline equipped with a regulating valve to obtain replenished gas; a first pressure sensor, located in the gas storage tank, for detecting the gas pressure in the gas storage tank and outputting a pressure signal; a controller, communicatively connected to the first flow sensor and a release valve, for controlling the release valve to open in response to the gas flow rate corresponding to the flow signal being lower than a first preset flow threshold, thereby forming the dust removal airflow; the controller is also communicatively connected to the first pressure sensor and the regulating valve, for setting the opening of the regulating valve according to the pressure signal from the first pressure sensor, thereby adjusting the gas pressure output from the main gas tank to the gas storage tank, so that the gas pressure in the gas storage tank is within a preset pressure range.

[0006] In the first aspect of the embodiment, the gas storage tank pipeline is connected to an air pump; the circuit control system includes: a pressure switch, disposed in the gas storage tank, for detecting the gas pressure of the gas storage tank, and generating different switching signals when the gas pressure of the gas storage tank is outside a preset pressure range, so as to trigger the air pump to run or stop, and the air pump replenishes the gas storage tank when it runs.

[0007] In the first aspect of the embodiment, the gas storage tank pipeline is connected to an air pump; the controller is communicatively connected to the first pressure sensor, the pressure switch and the air pump, and is used to independently or collaboratively control the opening of the regulating valve and the operation of the air pump according to the pressure signal of the first pressure sensor and / or the switching signal of the pressure switch, so as to keep the gas pressure of the gas storage tank within a preset pressure range.

[0008] In a first aspect embodiment, controlling the opening of the regulating valve and the operation of the air pump independently or collaboratively based on the pressure signal from the first pressure sensor and / or the switching signal from the pressure switch, so as to keep the gas pressure in the gas storage tank within a preset pressure range, includes at least one of the following: 1) In response to the current gas pressure represented by the first pressure signal being lower than a preset lower pressure threshold, the controller obtains a comparison result of the pressure difference value between the current gas pressure and the preset lower pressure threshold with a preset pressure difference threshold; when the comparison result indicates that the pressure difference value between the current gas pressure and the preset lower pressure threshold is higher than the preset pressure difference threshold, the opening of the regulating valve is first set. 1) The gas pressure in the storage tank is raised to an intermediate pressure value close to the preset lower threshold, and then the gas pressure in the storage tank is raised to the preset pressure range by the operation of the air pump; 2) The controller adjusts the gas pressure in the storage tank based on the switch signal, prior to adjusting the gas pressure in the storage tank based on the pressure signal; 3) In response to the current gas pressure represented by the first pressure signal being higher than the preset upper threshold, the controller stops the air pump and closes the regulating valve; 4) For the controller, the pressure switch and the first pressure sensor are mutually primary and backup, and the air pump, the main gas tank, and the regulating valve are mutually primary and backup facilities for replenishing gas in the storage tank.

[0009] In a first aspect embodiment, the air filter backflushing device includes: a second air filter unit, including a second cylinder; the second cylinder includes: a second closed end and a second venting end opposite to each other, and a second accommodating space between the second closed end and the second venting end; an air inlet is provided on the side wall of the second cylinder, which is connected to the first accommodating space via the first air outlet; an annular second filter element is provided in the second accommodating space, with its two ends respectively abutting against the second closed end and the second venting end; the venting end of the second cylinder is provided with a second air outlet for connecting to an engine; the second air outlet is located within the annulus of the second filter element.

[0010] In an embodiment of the first aspect, the circuit control system includes: a second flow sensor configured to be connected to the second air outlet and communicatively connected to the controller, for detecting the airflow rate of the air outlet of the second air filter unit and outputting a second flow signal; the controller is further configured to control the release valve to open in response to the first flow signal being lower than a first preset airflow rate threshold and / or the airflow rate corresponding to the second flow signal being lower than a second preset airflow rate threshold, so as to form the dust removal airflow.

[0011] In an embodiment of the first aspect, the circuit control system includes: a second pressure sensor configured to be connected to the air inlet and communicatively linked to the controller, for detecting the air inlet pressure of the second air filter unit and outputting a second pressure signal; the controller is further configured to independently or collaboratively control the opening of the regulating valve and the operation of the air pump in response to the first flow signal being lower than a first preset airflow flow threshold and / or the airflow corresponding to the second flow signal being lower than a second preset airflow flow threshold, so that the gas pressure of the air tank is within a preset pressure range.

[0012] This disclosure provides a second aspect of an air filter backflushing device for supplying air filtration for engines used in engineering equipment. The air filter backflushing device includes: a first air filter unit, a second air filter unit, an air tank, and a release valve. The first air filter unit includes a first cylindrical body. The first cylindrical body includes: a first closed end and a first venting end opposite to each other, and a first accommodating space between the first closed end and the first venting end. The first cylindrical body contains an annular first filter element with its two ends respectively abutting the first closed end and the first venting end. The venting end of the first cylindrical body has a first air outlet located within the annulus of the first filter element. The air tank is connected to the first accommodating space via the first air outlet. The air pressure inside the air tank is higher than the air pressure in the first accommodating space. The release valve is used for… A second air filtration unit includes a second cylinder; the second cylinder includes: a second closed end and a second venting end opposite to each other, and a second receiving space between the second closed end and the second venting end; an air inlet on the side wall of the second cylinder that is connected to the first receiving space via the first air outlet in a straight line; an annular second filter element with its two ends respectively abutting the second closed end and the second venting end in the second receiving space; a second air outlet on the venting end of the second cylinder for connecting to the engine; the second air outlet being located within the annulus of the second filter element; and a circuit control system as described in any one of the first aspects.

[0013] In a second aspect embodiment, the first air outlet is provided with a sleeve assembly; the sleeve assembly includes: an inner tube, which connects the first air outlet and the air inlet, and has a port for outputting filtered airflow; an outer tube, which is fitted over the inner tube and its end away from the first cylinder is airtightly connected to the inner tube; an airflow channel with a jet nozzle communicating with a first accommodating space is formed between the outer tube and the inner tube, the jet nozzle being formed between the other end of the outer tube near the first cylinder and the inner tube, and the outer tube being connected to a pipeline for transmitting dust removal airflow to the first filter element in the first cylinder, so as to allow the dust removal airflow to flow into the airflow channel.

[0014] In a second embodiment, the edge of the inner tube near one end of the first cylinder is inclined toward the first filter element so that the jet nozzle faces toward the first filter element.

[0015] As described above, this disclosure provides a circuit control system and application apparatus for an air filter backflushing device. The apparatus includes: a first air filtration unit, an air tank, and a release valve; a first air outlet is provided at the air inlet of the first cylinder; the air tank is connected to the first accommodating space via the first air outlet; the release valve is used to be set to open / close the pipeline from the air tank to the first air outlet; the circuit control system includes: a first flow sensor connected to the first air outlet, a first pressure sensor disposed in the air tank, a regulating valve disposed between the air tank and the main air pipe, and a controller communicatively connected thereto. Thus, the controller can use the first flow sensor to detect filter element fouling to initiate self-cleaning, and control the gas pressure of the air tank within a range based on feedback from the first pressure sensor, thus providing good protection for the filter element, increasing filter element life, and enhancing product competitiveness. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of an air filter backflushing device according to an embodiment of the present disclosure is shown.

[0017] Figure 2 This is a longitudinal cross-sectional view of an air filter backflushing device according to an embodiment of the present disclosure.

[0018] Figure 3 This is a longitudinal cross-sectional view of an air filter backflushing device according to one embodiment of the present disclosure.

[0019] Figure 4 A schematic diagram of the electronic control system of an air filter backflushing device in one embodiment of this disclosure is shown.

[0020] Figure 5 A schematic diagram of the electronic control system of an air filter backflushing device according to another embodiment of this disclosure is shown.

[0021] Figure 6 exhibit Figure 5 A flowchart illustrating one air replenishment control method of the controller in this embodiment.

[0022] Figure 7 A schematic diagram of the electronic control system of an air filter backflushing device according to another embodiment of this disclosure is shown.

[0023] Figure 8 A schematic diagram of the electronic control system of an air filter backflushing device according to another embodiment of this disclosure is shown. Detailed Implementation

[0024] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the information disclosed herein. This disclosure can also be implemented or applied through other different specific embodiments, and various details in this disclosure can be modified or changed according to different viewpoints and application modules without departing from the spirit of this disclosure. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this disclosure can be combined with each other.

[0025] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings, so that those skilled in the art to which this disclosure pertains can readily implement it. This disclosure may be embodied in many different forms and is not limited to the embodiments described herein.

[0026] In this disclosure, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic represented in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in any one or a group of embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples represented in this disclosure, as well as the features of those different embodiments or examples.

[0027] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this disclosure, "a set" means two or more, unless otherwise explicitly specified.

[0028] For the purpose of clarity, devices unrelated to the description are omitted, and the same or similar components throughout the specification are given the same reference numerals.

[0029] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0030] While the terms first, second, etc., are used in some examples herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, step, operation, element, module, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, modules, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0031] The technical terms used herein are for reference only to specific embodiments and are not intended to limit the scope of this disclosure. The singular form used herein includes the plural form unless the statement explicitly indicates otherwise. The word "comprising" as used in this specification means to specify a particular characteristic, region, integer, step, operation, element, and / or component, and does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0032] Although not explicitly defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with the relevant technical literature and the message of the present disclosure, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0033] Typically, equipment with engines has an air filter backflushing device installed before the engine intake to prevent dust from entering the engine and affecting its operation. Construction equipment, such as off-highway mining trucks and excavators, also requires air filters for their engines.

[0034] In current air filtration devices, some adopt a multi-stage air filter unit structure, while others use high-pressure airflow to achieve self-cleaning of the air filter unit. However, these solutions are mainly designed with the air filtration effect in mind, while ignoring the fact that the air filter unit may be made of relatively fragile materials, such as paper. Inappropriate airflow may damage the filter unit, i.e., there is a lack of protective measures.

[0035] Therefore, the embodiments of this disclosure can provide a circuit control system for an air filter backflushing device, which dynamically controls the airflow pressure-related equipment in the air filter backflushing device to avoid damage caused by unsuitable airflow pressure in the device, such as damage to the filter element.

[0036] The air filter backwash device will be described exemplarily below.

[0037] like Figure 1 The diagram shown illustrates the structure of an air filter backflushing device according to an embodiment of this disclosure.

[0038] exist Figure 1 The air filtration device shown includes a first air filtration unit 100a, a second air filtration unit 100b, an air storage tank 103, and a release valve 104.

[0039] The first air filter unit 100a includes a first cylindrical body 101a. See also... Figure 2 As shown, the first cylindrical body 101a includes: a first closed end 111a (shown as the upper end in the figure) and a first venting end 113a (shown as the lower end in the figure), and a first receiving space 112a between the first closed end 111a and the first venting end 113a. As an example, the first closed end 111a of the first cylindrical body 101a is sealed by a removable first end cap 102a to form a closure. The first venting end 113a is provided with a first air outlet 1131a. As an example, the first cylindrical body 101a may have a set of first air inlet holes 114a circumferentially provided on the end face of the venting end (see reference). Figure 2 ), and a set of second air inlet holes 115a can be provided circumferentially along the side wall of the first cylinder 101a.

[0040] You can refer to them together. Figure 2 and Figure 3As shown, a first filter element 116a is provided inside the first cylindrical body 101a. The first filter element 116a can be annular, for example, circular, and coaxially arranged with the first cylindrical body 101a. The two ends of the first filter element 116a are respectively abutted against the first closed end 111a and the first venting end 113a in the first cylindrical body 101a, and the first air outlet 1131a is located inside the ring of the first filter element 116a. The first filter element 116a can be divided into a pre-filtration region 1121a outside the ring and a post-filtration region 1122a inside the ring in the first accommodating space 112a of the first cylindrical body 101a. The first filter element 116a and the first air outlet 1131a of the first cylindrical body 101a are inside the ring of the first filter element 116a and can be coaxially arranged with the first filter element 116a and the first cylindrical body 101a, sharing the same first central axis. Of course, in other embodiments, the first air outlet 1131a may not be coaxially arranged with the first filter element 116a and the first cylinder 101a, and its own central axis may be the first central axis. For example, the first air inlet hole 114a is located between the sidewalls of the first filter element 116a and the first cylinder 101a.

[0041] The second air filter unit 100b is connected as the downstream stage of the first air filter unit 100a. The second air filter unit 100b may have a similar structure to the first air filter unit 100a, but the second air filter unit 100b does not need to be provided with the first air inlet 114a and the second air inlet 115a.

[0042] Specifically, the second air filter unit includes a second cylinder 101b. The second cylinder 101b includes: a second closed end 111b and a second venting end 113b, and a second receiving space 112b between the second closed end 111b and the second venting end 113b. As an example, the second closed end 111b of the second cylinder 101b is closed by a second end cap 102b. An air inlet communicating with the first air outlet 1131a is provided on the side wall of the second cylinder 101b. The second venting end 113b is provided with a second air outlet 1131b for communicating with the engine. Figure 3 As exemplified, a second filter element 116b may be disposed in the accommodating space 112b, with its two ends respectively abutting against the second closed end 111b and the second venting end 113b. Exemplarily, the second filter element 116b is coaxially disposed with the second cylinder 101b. The second air outlet 1131b is located within the ring of the second filter element, i.e., within the filtered area.

[0043] For example, the first air filter unit 100a and the second air filter unit 100b may have the same size structure, and the second filter element 116b and the first filter element 116a may be the same, which can serve as a backup for the first filter element 116a to improve the reliability of the air filtration device.

[0044] like Figure 3 As indicated by the middle arrow, the airflow entering the first cylinder 101a passes through the first filter element 116a, flows downward from the first outlet 1131a into the inlet 110b of the second cylinder 101b, passes through the second filter element 116b, and flows out of the second cylinder 101b from the second outlet 1131b. The air enters the engine after undergoing two stages of filtration, providing clean air.

[0045] It should be noted that although two-stage air filtration units 100a and 100b are provided in this embodiment, the second air filtration unit 100b is not necessary and can be selected according to needs, and is not limited to the illustration.

[0046] In the optional examples, you can refer to Figure 2 As shown, the air inlet 110b and the first air outlet 1131a are connected by a straight pipe, exemplified by a sleeve assembly 108, which extends in a straight line. The first central axis Y, which coincides with the first air outlet 110b and the first air outlet 1131a, intersects with the center O of the second cylinder (i.e., the two central axes intersect), ensuring that the first air filter unit 100a and the second air filter unit 100b are centrally connected radially in the second air filter unit 100b. Figure 2 As illustrated, the first air filter unit 100a can be vertically positioned, with its central axis collinear with the central axis of the first air outlet 1131a. The second air filter unit 100b can be horizontally positioned, with its central axis perpendicular to and intersecting the central axis of the first air outlet 1131a, the central axis of the first air outlet 1131a passing through the center of the second air filter unit 100b. In this structure, the air exiting the first air outlet 1131a enters the second cylinder 101b radially in a centered manner. Compared to the eccentric connection method where the first air outlet 1131a deviates from the central axis of the second cylinder 101b, this avoids swirling airflow, prevents energy loss of the airflow, and ensures sufficient intake flow.

[0047] The gas storage tank 103 is connected to the first accommodating space 112a via the first gas outlet 1131a. The gas pressure inside the gas storage tank 103 is higher than the gas pressure in the first accommodating space 112a. In some embodiments, the gas storage tank 103 stores gas at a pressure of 8 kg to 10 kg.

[0048] The release valve 104 is configured to open / close the pipeline from the gas storage tank 103 to the first air outlet 1131a, so as to release the dust removal airflow from the gas storage tank 103 through the first air outlet 1131a to the first filter element 116a when the pipeline is open. As an example, the release valve 104 may be a pulse solenoid valve.

[0049] Please refer to them together. Figure 5 As shown, Figure 5 This diagram illustrates a module schematic of the electronic control system of an air filtration device according to an embodiment of the present disclosure. The controller 105 is communicatively connected to and sets the valve state of the release valve 104. As an example, the controller 105 can trigger the release valve 104 to open the pipeline each time via a pulse signal. In some embodiments, the controller 105 can be implemented based on an MCU, SoC, CPU, or FPGA, etc.

[0050] Specifically, such as Figure 2 The diagram illustrates the self-cleaning function of the first air filter unit 100a. When self-cleaning is required, the controller 105 sends a pulse signal to the release valve 104, setting the valve state of the release valve 104 to open the pipeline from the air tank 103 to the first air outlet 1131a. High-pressure gas from the air tank 103 rushes into the first cylinder 101a from the first air outlet 1131a, acting as a dust-removing airflow to reach the filtered area 1122a. Since external air enters from the first air inlet 114a and the second air inlet 115a and passes through the first filter element 116a from the pre-filtration area 1121a to the filtered area 1122a, dust is retained on the surface of the first filter element 116a in the pre-filtration area 1121a, as shown by the arrows in the diagram. This dust-removing airflow causes the dust adhering to the first filter element 116a to fall off and be discharged from the first air inlet 114a and the second air inlet 115a near the lower end. Thus, the first air filter unit 100a achieves self-cleaning.

[0051] The amount of dust accumulation on the filter element affects the airflow rate; more dust results in a lower airflow rate. Therefore, as an example, please refer to... Figure 4As shown, a first flow sensor 107 can be installed and communicatively connected to the controller 105. When the detected airflow rate is lower than a certain preset threshold, indicating that the dust accumulation on the first filter element 116a has reached a condition requiring the initiation of a self-cleaning action, the controller 105 can output the pulse signal to perform the self-cleaning action. In some embodiments, the first air outlet 1131a can be connected to a transfer pipe, the two ends of which are respectively connected to the first receiving space 112a inside the first cylinder 101a and the next-stage device (such as the second cylinder 101b, or directly connected to the engine in other embodiments). The air tank 103 can be piped to the side wall of the transfer pipe, and the first flow sensor 107 can be installed inside the transfer pipe.

[0052] exist Figure 2 In this embodiment, the adapter pipe can be implemented as a sleeve assembly 108, disposed at the first air outlet 1131a. Optionally, the sleeve assembly 108 can be in airtight contact with the first air outlet 1131a. The sleeve assembly 108 includes an inner tube 181 and an outer tube 182. The inner tube 181 is connected to the first air outlet 1131a and has a port for outputting filtered airflow, i.e., the lower end opening in the figure, which can be connected to the air inlet 110b of the second cylinder 101b. Exemplarily, the first flow sensor 107 can be disposed in the inner tube 181. The outer tube 182 is fitted over the inner tube 181, and its end away from the first cylinder 101a is airtightly connected to the inner tube 181. An airflow channel 183 with a jet nozzle 1831 communicating with the first receiving space 112a is formed between the outer tube 182 and the inner tube 181. The jet nozzle 1831 is formed by the other end of the outer tube 182 and the inner tube 181. The airflow channel 183 provides dust removal airflow to the first filter element 116a inside the first cylinder 101a. As an example, the outer tube 182 may be provided with a vent to communicate with the air tank 103. The edge of the inner tube 181 near the inside of the first cylinder 101a (i.e., the upper end in the figure) is inclined outward to guide the dust removal airflow ejected from the jet nozzle 1831 to impact the inner surface of the first filter element 116a, realizing a "ring-shaped horn jet nozzle" structure, which helps to improve the cleaning effect on the first filter element 116a.

[0053] Additionally, for example, such as Figure 1 and Figure 2As shown, the gas storage tank 103 can be installed vertically. The release valve 104 can be located at the upper end of the gas storage tank 103, and a drain valve 133 is provided at the bottom of the gas storage tank 103. The advantage of placing the release valve 104 at the upper end of the gas storage tank 103 is that the gas storage tank 103 may contain both gas and liquefied liquid. When spraying dust removal airflow, it is necessary to spray gas and avoid liquid spraying out into the first filter element 116a (generally non-washable paper) and causing damage. Therefore, by releasing gas at the upper end of the gas storage tank 103 through the release valve 104 and releasing liquid at the bottom through the drain valve 133, the liquid level can be effectively controlled to be at a low position, and it will not enter the first air outlet 1131a along with the gas.

[0054] As an example, for example Figure 1 As shown, in some engineering equipment equipped with a main gas tank 200, such as off-highway mining trucks, gas can be supplied to the gas storage tank 103 through the main gas tank. Specifically, the gas storage tank 103 can be connected to the main gas tank 200 via a pipeline equipped with a regulating valve 201. The gas storage tank 103 can be equipped with a first pressure sensor 134 for detecting a first pressure signal of the gas pressure in the gas storage tank 103. See also... Figure 5 As shown, the controller 105 is communicatively connected to the first pressure sensor 134 and the regulating valve 201. It receives the first pressure signal and sets the opening of the regulating valve 201 according to the first pressure signal. For example, by adjusting the opening of the regulating valve 201, the pressure of the high-pressure gas output from the main gas tank 200 to the gas storage tank 103 can be adjusted. For instance, if the gas pressure inside the gas storage tank 103 is higher than a preset threshold, the opening of the regulating valve 201 can be increased to reduce the pipeline gas pressure; conversely, if the gas pressure inside the gas storage tank 103 is too low, the opening of the regulating valve 201 can be decreased to increase the gas pressure.

[0055] It is understandable that when the release valve 104 used in the air tank 103 is a solenoid valve with only two states of open / close, the regulating valve 301 needs to be set with a suitable pipeline pressure to avoid the problem of excessive or insufficient air pressure in the air tank 103. Excessive air pressure may spray out dust removal airflow that exceeds the air pressure that the first filter element 116a can withstand, thereby damaging the first filter element 116a and shortening its lifespan.

[0056] In some embodiments, besides the main gas tank 300 and regulating valve 301 as a method of replenishing gas to the gas storage tank 103, other gas replenishment facilities may be provided. For example... Figure 1As shown, the bottom of the gas storage tank 103 can be connected to the air pump 300, which is used to pump air into the gas storage tank 103 from bottom to top. Since the release valve 104, as described in the previous embodiment, releases air into the gas storage tank 103 at the top and cooperates with the drain valve 133 to control the liquid level in the gas storage tank 103, the liquid will not be pumped into the first air outlet 1131a under the action of the air pump. Figure 1 The air pump 300 is exemplary covered by a protective cover.

[0057] In addition, the gas storage tank 103 is equipped with a pressure switch 132 triggered when the gas storage tank 103 reaches a preset gas pressure. See also... Figure 5 As shown, the pressure switch 132 is communicatively connected to the air pump 300. Exemplarily, the air pump 300 can generate a switching signal when the pressure switch 132 reaches a lower or upper threshold, respectively, and transmit the switching signal to the air pump 300 to activate it. For example, when the air pressure in the gas tank 103 reaches the lower threshold, the pressure switch 132 generates a first switching signal, which triggers the air pump 300 to start pumping air into the gas tank 103. When the air pressure in the gas tank 103 reaches the upper threshold, the pressure switch 132 generates a second switching signal, which triggers the air pump 132 to stop pumping air. The threshold range formed by the lower and upper thresholds can be, for example, 8 kg to 10 kg pressure as in the previous embodiment. Therefore, in this example, the pressure switch 132 and the air pump 300 can be connected to form a control loop, and the air pump 300 can be triggered to either start or stop operating without the involvement of the controller 105.

[0058] In some other embodiments, the controller 105 is communicatively connected to the first pressure sensor 134, the pressure switch 132, and the air pump 300, and is used to independently or collaboratively control the opening degree of the regulating valve 201 and the operation of the air pump 300 based on the pressure signal of the first pressure sensor 134 and / or the switching signal of the pressure switch 132, so that the gas pressure of the gas storage tank 103 is within a preset pressure range.

[0059] As an example, the controller 105 may independently or collaboratively control the opening degree of the regulating valve 201 and the operation mode of the air pump 300, and may include at least one of the following.

[0060] In one example, see reference Figure 6 As shown, the display Figure 5 A flowchart illustrating one air replenishment control method of the controller in this embodiment.

[0061] exist Figure 6 The process includes:

[0062] Step S601: In response to the current gas pressure represented by the first pressure signal being lower than a preset lower gas pressure threshold, the controller obtains a comparison result between the pressure difference value of the current gas pressure and the preset lower gas pressure threshold and a preset pressure difference threshold.

[0063] Step S602: When the comparison result indicates that the pressure difference value of the preset lower limit threshold is higher than the preset pressure difference threshold, first set the opening of the regulating valve to raise the air pressure of the gas storage tank to an intermediate air pressure value close to the preset lower limit threshold, and then raise the air pressure of the gas storage tank to the preset air pressure range by running the air pump.

[0064] In this example, when the controller 105 detects through the first pressure sensor 134 that the current pressure of the air tank 103 is insufficient and the distance from the preset lower threshold is also large, it can control the opening of the regulating valve to quickly replenish air from the main air tank 200. However, the main air tank 200 is engineering equipment and is used by engineering equipment, so there is a risk of insufficient air pressure, which may result in insufficient air replenishment to the air tank 103. Therefore, the main air tank 200 can be used to replenish the air tank 103 to an intermediate air pressure value first. This can be achieved through empirical settings, measurement settings, etc., and then the air pump 300 can be used to pump the air tank 103 to the preset air pressure range, balancing air replenishment efficiency and risk avoidance.

[0065] In some embodiments, for the controller 105, the pressure switch 132 and the first pressure sensor 134 are mutually primary and backup, and the air pump 300, the main air tank 200, and the regulating valve 201 are mutually primary and backup facilities for replenishing air to the air storage tank 103. Specifically, since both the pressure switch 132 and the first pressure sensor 134 detect the pressure of the air storage tank 103, they can be mutually primary and backup; that is, if one fails, the controller 105 can obtain a pressure signal through the other. The air pump 300, the main air tank 200, and the regulating valve 201 are mutually primary and backup facilities for replenishing air to the air storage tank 103. If one fails, for example, if the regulating valve 201 cannot be opened after being closed or the air pump 300 is damaged, the controller 105 can control the other air replenishment facility to replenish air to the air storage tank 103.

[0066] In another example, the controller 105 adjusts the gas pressure of the gas tank 103 based on the switch signal, prioritizing adjustment based on the pressure signal. Specifically, the pressure switch 132 and the first pressure sensor 134 can be mutually primary and backup, but the pressure switch 132 takes precedence over the first pressure sensor 134. Since the pressure switch 132 itself can output two switch signals (below a preset lower threshold or above a preset upper threshold) to determine whether the gas pressure of the gas tank 103 is outside the preset pressure range, for the controller 105, the two switch signals can serve as a backup reminder for gas replenishment, and the amount of data exchanged is small. In a certain operating mode, such as a low-load operating mode, the controller 105 can also control the gas pressure of the gas tank 103 only in response to the switch signal of the pressure switch 132, without responding to the first pressure signal of the first pressure sensor 134.

[0067] In one example, in response to the current gas pressure indicated by the first pressure signal being higher than a preset upper limit threshold, the controller 105 stops the air pump 300 and closes the regulating valve 201. Specifically, when excessively high gas pressure is detected, the controller 105 may stop the gas replenishment operation of each gas replenishment facility.

[0068] like Figure 7 The diagram shown illustrates the circuit structure of the circuit control system in another embodiment of this disclosure.

[0069] exist Figure 7 The circuit control system described herein may include a second flow sensor 109, configured to be connected to the second air outlet and communicatively connected to the controller 105, for detecting the airflow rate of the air outlet of the second air filter unit 100b and outputting a second flow signal; the controller 105 is further configured to control the release valve 104 to open in response to the first flow signal being lower than a first preset airflow rate threshold and / or the airflow rate corresponding to the second flow signal being lower than a second preset airflow rate threshold, so as to form the dust removal airflow. For example, when the first flow sensor 107 fails, the second flow sensor 109 can serve as a backup for the first flow sensor 107. Furthermore, by using two flow signals for comprehensive judgment (e.g., both flow signals indicate that the airflow rate is too low), a more accurate judgment result on the turbidity of the first filter element 116a can be obtained, avoiding misjudgment.

[0070] like Figure 8 The diagram shown illustrates the circuit structure of the circuit control system in another embodiment of this disclosure.

[0071] exist Figure 8The circuit control system further includes a second pressure sensor 135 and an opening / closing actuator 136. The second pressure sensor 135 is configured to be connected to the air inlet and is used to detect the intake pressure of the second air filter unit 100b and output a second pressure signal. The opening / closing actuator 136 is controllably used to open and close the air inlet 110b. The controller 105 is communicatively connected to the second pressure sensor 135 and the opening / closing actuator 136, and is used to control the actuator 136 to close the air inlet 110b in response to the pressure represented by the second pressure signal being higher than a preset pressure threshold. For example, the opening / closing actuator 136 can be implemented as a motor-driven door opening / closing mechanism.

[0072] Figure 8 The solution in this embodiment can promptly seal the air inlet 110b when an excessively high-pressure airflow arrives, thus protecting the second filter element 116b in the second air filter unit 100b from damage by the incoming excessively high-pressure airflow. The excessively high-pressure airflow may originate from external airflow to the air filter backflushing device, or it may originate from a brief, impacting airflow from the main air tank 200, air storage tank 103, first receiving space 112a, inner tube 181, and then into the air inlet 110b after the release valve 201 fails.

[0073] It should be noted that, Figures 4-7 The solutions in the electronic control system can be arranged and combined, for example, including... Figure 7 The second flow sensor 109 in the middle includes Figure 8 The second pressure sensor 135 and the opening / closing actuator 136, etc., are not limited to those shown in the figure. The dashed boxes around the circuit components in the figure indicate that they are optional.

[0074] In summary, this disclosure provides a circuit control system and application apparatus for an air filter backflushing device. The apparatus includes: a first air filtration unit, an air tank, and a release valve; a first air outlet is provided at the air inlet of the first cylinder; the air tank is connected to the first accommodating space via the first air outlet; the release valve is used to be set to open / close the pipeline from the air tank to the first air outlet; the circuit control system includes: a first flow sensor connected to the first air outlet, a first pressure sensor disposed in the air tank, a regulating valve disposed between the air tank and the main air pipe, and a controller communicatively connected to them. Thus, the controller can use the first flow sensor to detect filter element fouling to initiate self-cleaning, and control the gas pressure of the air tank within a range based on feedback from the first pressure sensor, thus providing good protection for the filter element, increasing filter element life, and enhancing product competitiveness.

[0075] The above embodiments are merely illustrative of the principles and effects of this disclosure and are not intended to limit this disclosure. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this disclosure. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this disclosure should still be covered by the claims of this disclosure.

Claims

1. A circuit control system for an air filter backflushing device, characterized in that, The air filter backflushing device supplies air filtration for the engines used in engineering equipment; The air filter backwash device includes: a first air filter unit, an air tank and a release valve; A first air filtration unit includes a first cylinder; the first cylinder includes: a first closed end and a first venting end opposite to each other, and a first receiving space between the first closed end and the first venting end; the first cylinder is provided with an annular first filter element whose two ends respectively abut against the first closed end and the first venting end; the venting end of the first cylinder is provided with a first air outlet, and the first air outlet is located inside the annulus of the first filter element. A gas storage tank is connected to the first accommodating space via the first gas outlet; wherein the gas pressure inside the gas storage tank is higher than the gas pressure in the first accommodating space; A release valve is used to be set to open / close the pipeline from the gas storage tank to the first outlet, so as to release the dust removal airflow from the gas storage tank through the first outlet to the first filter element when the pipeline is open. The circuit control system includes: A first flow sensor is configured to be connected to the first air outlet, used to detect the airflow rate at the first air outlet and output a first flow signal; wherein, the air storage tank is connected to the main air tank of the engineering equipment via a pipeline equipped with a regulating valve to obtain replenished air; A first pressure sensor is installed in the gas storage tank to detect the gas pressure in the gas storage tank and output a pressure signal. The controller is communicatively connected to the first flow sensor and the release valve, and is used to control the release valve to open in response to the gas flow corresponding to the flow signal being lower than a first preset flow threshold, so as to form the dust removal airflow; the controller is also communicatively connected to the first pressure sensor and the regulating valve, and is used to set the opening of the regulating valve according to the pressure signal of the first pressure sensor, so as to adjust the gas pressure output from the main gas tank to the gas storage tank, so that the gas pressure in the gas storage tank is within a preset pressure range; The release valve is located at the upper end of the gas storage tank, and a drain valve is provided at the bottom of the gas storage tank; the bottom pipeline of the gas storage tank is connected to an air pump, which is used to pump air into the gas storage tank from bottom to top; the circuit control system includes: A pressure switch is installed in the gas storage tank to detect the gas pressure in the gas storage tank and generate different switching signals when the gas pressure in the gas storage tank is outside the preset pressure range, so as to trigger the air pump to run or stop. When the air pump runs, it replenishes the gas in the gas storage tank.

2. The circuit control system according to claim 1, characterized in that, The controller is communicatively connected to the first pressure sensor, the pressure switch, and the air pump. It is used to independently or collaboratively control the opening of the regulating valve and the operation of the air pump based on the pressure signal from the first pressure sensor and / or the switching signal from the pressure switch, so that the gas pressure in the gas storage tank is within a preset pressure range.

3. The circuit control system according to claim 2, characterized in that, The step of independently or collaboratively controlling the opening of the regulating valve and the operation of the air pump based on the pressure signal from the first pressure sensor and / or the switching signal from the pressure switch, so as to keep the gas pressure in the air tank within a preset pressure range, includes at least one of the following: In response to the fact that the current gas pressure represented by the first pressure signal is lower than a preset lower gas pressure threshold, the controller obtains a comparison result of the pressure difference value between the current gas pressure and the preset lower gas pressure threshold and a preset pressure difference threshold. When the comparison result indicates that the pressure difference value of the preset lower limit threshold is higher than the preset pressure difference threshold, the opening of the regulating valve is first set to raise the air pressure of the gas storage tank to an intermediate air pressure value close to the preset lower limit threshold, and then the air pump is used to raise the air pressure of the gas storage tank to the preset air pressure range. The controller adjusts the gas pressure of the gas storage tank based on the switch signal, which takes priority over adjusting the gas pressure of the gas storage tank based on the pressure signal; When the current gas pressure indicated by the first pressure signal is higher than a preset upper limit threshold, the controller stops the air pump and closes the regulating valve. For the controller, the pressure switch and the first pressure sensor are mutually primary and backup, and the air pump, main air tank and regulating valve are mutually primary and backup facilities for replenishing air to the storage tank.

4. The circuit control system according to claim 1, characterized in that, The air filter backflushing device includes: a second air filter unit, including a second cylinder; the second cylinder includes: a second closed end and a second venting end opposite to each other, and a second accommodating space between the second closed end and the second venting end; an air inlet is provided on the side wall of the second cylinder, which is connected to the first accommodating space via the first air outlet; an annular second filter element is provided in the second accommodating space, with its two ends respectively abutting against the second closed end and the second venting end; the venting end of the second cylinder is provided with a second air outlet for connecting to the engine; the second air outlet is located inside the annulus of the second filter element.

5. The circuit control system according to claim 4, characterized in that, include: The second flow sensor is configured to be connected to the second air outlet and communicatively connected to the controller, for detecting the airflow rate of the air outlet of the second air filter unit and outputting a second flow signal; the controller is further configured to control the release valve to open in response to the first flow signal being lower than a first preset airflow rate threshold and / or the airflow rate corresponding to the second flow signal being lower than a second preset airflow rate threshold, so as to form the dust removal airflow.

6. The circuit control system according to claim 4, characterized in that, include: The second pressure sensor is configured to be connected to the air inlet and communicatively connected to the controller, for detecting the air inlet pressure of the second air filter unit and outputting a second pressure signal; the controller is also configured to independently or collaboratively control the opening of the regulating valve and the operation of the air pump in response to the first flow signal being lower than a first preset airflow flow threshold and / or the airflow corresponding to the second flow signal being lower than a second preset airflow flow threshold, so that the gas pressure of the air tank is within a preset pressure range.

7. An air filter backwashing device, characterized in that, An air filter is supplied to the engine used in engineering equipment; the air filter backflushing device includes: a first air filter unit, a second air filter unit, an air tank, and a release valve; A first air filtration unit includes a first cylinder; the first cylinder includes: a first closed end and a first venting end opposite to each other, and a first receiving space between the first closed end and the first venting end; the first cylinder is provided with an annular first filter element whose two ends respectively abut against the first closed end and the first venting end; the venting end of the first cylinder is provided with a first air outlet, and the first air outlet is located inside the annulus of the first filter element. A gas storage tank is connected to the first accommodating space via the first gas outlet; wherein the gas pressure inside the gas storage tank is higher than the gas pressure in the first accommodating space; A release valve is used to be set to open / close the pipeline from the gas storage tank to the first outlet, so as to release the dust removal airflow from the gas storage tank through the first outlet to the first filter element when the pipeline is open. A second air filtration unit includes a second cylindrical body; the second cylindrical body includes: a second closed end and a second venting end opposite to each other, and a second receiving space between the second closed end and the second venting end; an air inlet is provided on the side wall of the second cylindrical body, which is connected to the first receiving space via a straight line through the first air outlet; an annular second filter element is provided in the second receiving space, with its two ends respectively abutting against the second closed end and the second venting end; the venting end of the second cylindrical body is provided with a second air outlet for connecting to an engine; the second air outlet is located within the annulus of the second filter element; and... The circuit control system as described in any one of claims 1 to 6.

8. The air filter backwashing device according to claim 7, characterized in that, The first air outlet is provided with a sleeve assembly; the sleeve assembly includes: The inner tube connects the first air outlet and the air inlet, and is provided with a port for outputting the filtered airflow. An outer tube is fitted over the inner tube, with its end away from the first cylinder being airtightly connected to the inner tube; an airflow channel with a jet nozzle communicating with a first accommodating space is formed between the outer tube and the inner tube, the jet nozzle being formed between the other end of the outer tube near the first cylinder and the inner tube, and the outer tube being connected to a pipeline for transmitting dust removal airflow to the first filter element in the first cylinder, so as to allow the dust removal airflow to enter the airflow channel.

9. The air filter backwashing device according to claim 8, characterized in that, The edge of the inner tube near one end of the first cylinder is inclined toward the first filter element so that the air nozzle faces the first filter element.

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