Variable flow prefilter

Abstract

This utility model discloses a variable flow pre-filter, including a filter housing. The bottom of the filter housing has an exhaust port, and the top of the filter housing has an opening. A plug is installed inside the opening, and an air inlet is installed on the plug, with one end connected to the interior of the filter housing and the other end connected to the outside. A tray is located near the bottom inside the filter housing, and several support ribs connect the tray to the filter housing. A cylindrical air filter element is vertically placed on the tray. A retaining ring is pressed onto the top of the air filter element, surrounding its upper air inlet. The upper end of the retaining ring is connected to the plug and also surrounds the air inlet. The air inlet and the air filter element are coaxially aligned. The retaining ring is eccentrically positioned on the plug, and a cylindrical throttling valve block is filled inside the retaining ring. The throttling valve block has an axially penetrating throttling hole, eccentrically positioned on the throttling valve block. This pre-filter features a novel structure and adjustable flow rate.

Description

Technical Field

[0001] This utility model relates to the field of filtration equipment technology, and more specifically, it relates to a variable flow pre-filter. Background Technology

[0002] In fields such as air filtration and engine intake air purification, pre-filters serve as front-end filtration devices, and their performance directly affects system efficiency, energy consumption, and service life. Traditional pre-filters often employ a fixed flow design, maintaining a constant media flow rate through mechanical structures or single parameter settings. However, this approach has significant limitations in practical applications.

[0003] First, it has poor adaptability to operating conditions. The separation efficiency of the pre-filter is strongly correlated with the flow rate, and a fixed flow rate cannot match dynamically changing pollutant concentrations or equipment loads. For example, at low loads, the airflow velocity is insufficient, making it difficult to effectively separate large particulate pollutants; in highly polluted environments, filtration cannot be enhanced, leading to increased penetration.

[0004] Secondly, there is significant energy redundancy. To cover extreme operating conditions, traditional pre-filters need to be designed for maximum flow rate, and still maintain high flow rate operation in normal clean environments or low-load scenarios, resulting in 15%-30% waste of power or media, which does not meet energy-saving requirements.

[0005] Third, maintenance costs are high. Because the filtration load cannot be dynamically adjusted, the fixed flow design is prone to overload and clogging of the main filter element when the pollutant concentration fluctuates. Especially in dusty environments, the replacement cycle of the main filter element may be shortened to less than 30 days, increasing consumable costs and downtime losses.

[0006] Fourth, it lacks versatility. Different devices have significantly different flow rate requirements (e.g., the intake air volume of engines with different power can vary by up to 40%), requiring fixed flow rate pre-filters to be custom-made, which prolongs the research and development cycle and increases production costs. Therefore, this utility model proposes a variable flow rate pre-filter. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a variable flow pre-filter with a novel structure and adjustable flow rate.

[0008] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows: The utility model relates to a variable flow pre-filter, including a filter housing with a rotary structure, an exhaust port at the bottom of the filter housing, an opening at the top of the filter housing, a plug inside the opening, an air inlet on the plug having one end connected to the interior of the filter housing and the other end connected to the outside, a tray near the bottom inside the filter housing, several support ribs connecting the tray and the filter housing, a cylindrical air filter element vertically placed on the tray, a retaining ring pressing on the top of the air filter element surrounding its upper air inlet, the upper end of the retaining ring being connected to the plug, and the retaining ring also surrounding the air inlet;

[0009] The air intake nozzle and the air filter are arranged on the same axis. The retaining ring is eccentrically arranged on the plug. A cylindrical throttle valve block is filled in the retaining ring. The throttle valve block has a throttle hole that runs through the axial direction. The throttle hole is eccentrically arranged on the throttle valve block.

[0010] The present invention is further configured such that: the inner wall of the retaining ring is provided with a plurality of circumferential limiting protrusions extending along the axial direction, the included angle between two adjacent circumferential limiting protrusions is equal, the outer wall of the throttle valve block is provided with circumferential limiting grooves extending along the axial direction and matching the circumferential limiting protrusions one by one, and the circumferential limiting protrusions are slidably connected in the circumferential limiting grooves.

[0011] The present invention is further configured such that: a lower mounting plate connected to the filter housing is provided outside the opening, and an upper mounting plate matching the lower mounting plate is provided on the plug, and bolt holes are provided that pass through the lower mounting plate and the upper mounting plate simultaneously from the top and bottom, with bolts passing through the bolt holes and nuts threaded onto the bolts.

[0012] The present invention is further configured such that: a gasket is provided between the throttle valve block and the air filter element, and the cross-section of the gasket is the same shape and size as the cross-section of the throttle valve block.

[0013] The present invention is further configured such that a sealing ring is provided on the retaining ring and the air filter element.

[0014] The present invention is further configured such that the edge of the tray has a positioning guard.

[0015] The present invention is further configured such that the supporting ribs are distributed in a ring array with equal intervals around the axis of the filter housing.

[0016] The present invention is further configured such that: a plurality of rotating blades are provided on the outside of the air inlet, which are arranged in a ring array at equal intervals around its axis, and the rotating blades are also connected to the plug.

[0017] In summary, this utility model has the following beneficial effects:

[0018] 1. Adjust flow rate as needed. Automatically reduce flow rate to save energy in normal scenarios, and only activate high flow rate under extreme conditions to avoid energy waste throughout the day.

[0019] 2. Dynamically allocating the filtration load reduces main filter contamination, extending the replacement cycle in dusty environments and reducing consumable costs and downtime losses.

[0020] 3. Modular design adapts to different traffic requirements, eliminating the need for individual customization, shortening the R&D cycle and reducing production costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a partial structural schematic diagram of the present invention;

[0023] Figure 3 This is a schematic diagram illustrating the structure of the throttle valve block in this utility model;

[0024] Figure 4 yes Figure 3 A structural diagram from another perspective. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of this utility model, and not for limiting the patent claims of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

[0026] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0027] Example 1

[0028] See Figures 1 to 4As shown, the variable flow pre-filter involved in this embodiment includes a filter housing 1 with a rotary structure. The bottom of the filter housing 1 has an exhaust port 2, and the top of the filter housing 1 has an opening 3. A plug 4 is provided in the opening 3. An air inlet 5 is provided on the plug 4, with one end connected to the inside of the filter housing and the other end connected to the outside. A tray 6 is provided near the bottom inside the filter housing 1. Several support ribs 7 are connected between the tray 6 and the filter housing 1. A cylindrical air filter element 8 is vertically placed on the tray 6. A retaining ring 9 is pressed on the top of the air filter element 8, surrounding the upper air inlet. The upper end of the retaining ring 9 is connected to the plug, and the retaining ring 9 also surrounds the air inlet 5.

[0029] The air inlet 5 and the air filter 8 are arranged on the same axis. The retaining ring 9 is eccentrically arranged on the plug 4. The retaining ring 9 is filled with a cylindrical throttle valve block 10. The throttle valve block 10 has a throttle hole 11 that runs through along the axial direction. The throttle hole 11 is eccentrically arranged on the throttle valve block 10.

[0030] Furthermore, the inner wall of the retaining ring 9 is provided with a plurality of circumferential limiting protrusions 20 extending along the axial direction, and the included angle between two adjacent circumferential limiting protrusions 20 is equal. The outer wall of the throttle valve block 10 is provided with circumferential limiting grooves 12 extending along the axial direction and matching the circumferential limiting protrusions one by one. The circumferential limiting protrusions 20 are slidably connected in the circumferential limiting grooves 12.

[0031] Furthermore, the opening 3 is provided with a lower mounting plate 13 connected to the filter housing 1, and the plug 4 is provided with an upper mounting plate 14 that matches the lower mounting plate. It also includes bolt holes that pass through the lower mounting plate and the upper mounting plate simultaneously, with bolts 15 passing through the bolt holes and nuts 16 threaded onto the bolts 15.

[0032] Furthermore, a gasket (not shown) is provided between the throttle valve block 10 and the air filter element 8. The cross-section of the gasket has the same shape and size as the cross-section of the throttle valve block 10.

[0033] Furthermore, a sealing ring 17 is provided on the retaining ring 9 and the air filter element 8.

[0034] Furthermore, the support ribs 7 are arranged in a ring array with equal intervals around the axis of the filter housing 1.

[0035] In this embodiment, by adjusting the throttle valve blocks 10 with different circumferential installation positions within the retaining ring 9, different pre-filter combinations with different interception flow rates can be created to achieve on-demand assembly functionality and strong versatility.

[0036] The gap between the throttle valve block 10 and the air filter element 8 is filled by the setting of a gasket.

[0037] The sealing performance between the retaining ring 9 and the air filter element 8 is enhanced by the setting of the sealing ring 17.

[0038] Example 2

[0039] See Figures 1 to 4 As shown, the variable flow pre-filter involved in this embodiment is further configured, based on embodiment 1, with the edge of the tray 6 having a positioning stop 18.

[0040] In this embodiment, the positioning baffle 18 is used as a peripheral barrier to enable the air filter 8, which is placed vertically on the tray 6, to be quickly positioned.

[0041] Example 3

[0042] See Figures 1 to 4 As shown, the variable flow pre-filter involved in this embodiment is further configured based on embodiment 1, wherein the air inlet 5 is provided with a plurality of rotating blades 19 arranged in a ring array at equal intervals around its axis, and the rotating blades 19 are also connected to the plug 4.

[0043] In this embodiment, a lever 11 is provided to connect the air inlet 5 and the plug 4, which is used to enhance the connection strength between the air inlet 5 and the plug 4.

[0044] The variable flow pre-filter involved in this utility model can adjust the flow rate as needed. It automatically reduces the flow rate to save energy in normal scenarios and only activates the high flow rate under extreme conditions to avoid energy waste throughout the day. It dynamically distributes the filtration load to reduce the contamination of the main filter element and can extend the replacement cycle in dusty environments, thereby reducing consumable costs and downtime losses. Furthermore, its modular design adapts to different flow rate requirements, eliminating the need for individual customization, shortening the R&D cycle and reducing production costs. Overall, it has complete functions and strong practicality.

[0045] Unless otherwise specified, in this utility model, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the actual orientation or positional relationship shown. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the embodiments and according to the specific circumstances.

[0046] Unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A variable flow pre-filter, comprising a filter housing in a rotary structure, the bottom of the filter housing having an exhaust port, characterized in that: The top of the filter housing has an opening, and a plug is provided inside the opening. The plug has an air inlet with one end connected to the inside of the filter housing and the other end connected to the outside. The filter housing has a tray near the bottom, and several support ribs connect the tray and the filter housing. A cylindrical air filter element is vertically placed on the tray. A retaining ring is pressed on the top of the air filter element, surrounding the upper air inlet. The upper end of the retaining ring is connected to the plug, and the retaining ring also surrounds the air inlet. The air intake nozzle and the air filter are arranged on the same axis. The retaining ring is eccentrically arranged on the plug. A cylindrical throttle valve block is filled in the retaining ring. The throttle valve block has a throttle hole that runs through the axial direction. The throttle hole is eccentrically arranged on the throttle valve block.

2. The variable flow pre-filter according to claim 1, characterized in that: The inner wall of the retaining ring is provided with a plurality of circumferential limiting protrusions extending along the axial direction, and the included angle between two adjacent circumferential limiting protrusions is equal. The outer wall of the throttle valve block is provided with circumferential limiting grooves extending along the axial direction and matching the circumferential limiting protrusions one by one. The circumferential limiting protrusions are slidably connected in the circumferential limiting grooves.

3. The variable flow pre-filter according to claim 1 or 2, characterized in that: The opening is provided with a lower mounting plate connected to the filter housing. The plug is provided with an upper mounting plate that matches the lower mounting plate. It also includes bolt holes that pass through both the lower and upper mounting plates. Bolts are inserted into the bolt holes, and nuts are threaded onto the bolts.

4. The variable flow pre-filter according to claim 3, characterized in that: A gasket is provided between the throttle valve block and the air filter element. The cross-section of the gasket has the same shape and size as the cross-section of the throttle valve block.

5. The variable flow pre-filter according to claim 1, characterized in that: A sealing ring is provided on the retaining ring and the air filter element.

6. The variable flow pre-filter according to claim 1, characterized in that: The edge of the tray has a positioning guard.

7. The variable flow pre-filter according to claim 1, characterized in that: The supporting ribs are arranged in a ring array with equal intervals around the axis of the filter housing.

8. The variable flow pre-filter according to claim 1, characterized in that: The air inlet is provided with several rotating blades arranged in a ring array at equal intervals around its axis, and the rotating blades are also connected to the plug.

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