Flow adjustable pre-filter

Abstract

The utility model discloses a prefilter of adjustable flow, which comprises a filter housing, an exhaust nozzle is arranged at the bottom of the filter housing, an open top is arranged at the top of the filter housing, a plug is arranged in the open top, an air inlet nozzle is arranged on the plug and connected with the inside of the filter housing, a tray is arranged in the filter housing and close to the bottom, a plurality of supporting ribs are connected between the tray and the filter housing, a cylindrical air filter element is vertically arranged on the tray, a retaining ring is arranged on the top of the air filter element and surrounds the upper end air port of the air filter element, the upper end of the retaining ring is connected with the plug, and the retaining ring also surrounds the air inlet nozzle; a throttle valve block is filled in the retaining ring and tightly contacts the inner wall of the retaining ring, the throttle valve block moves axially relative to the retaining ring, a plurality of throttle holes are arranged on the edge of the throttle valve block and penetrate the throttle valve block along the axial direction, an elastic member is arranged between the throttle valve block and the air filter element, and an adjusting screw is threadedly connected on the plug. The prefilter has the characteristics of adjustable flow and convenient adjustment.

Description

Technical Field

[0001] This utility model relates to the field of filtration equipment technology, and more specifically, it relates to a pre-filter with adjustable flow rate. 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 outputs can vary by up to 40%), requiring fixed-flow pre-filters to be custom-made, which prolongs the development cycle and increases production costs. Therefore, this invention proposes a pre-filter with adjustable flow rate. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pre-filter with adjustable flow rate, which has the characteristics of adjustable flow rate and convenient adjustment.

[0008] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows: The utility model relates to a pre-filter with adjustable flow rate, 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 inlet and the air filter are arranged on the same axis. A throttling valve block with its outer wall tightly attached to the inner wall of the baffle ring is filled inside the baffle ring. The throttling valve block moves axially relative to the baffle ring. Throttling holes that pass through the axial direction are distributed around the edge of the throttling valve block. An elastic element is provided between the throttling valve block and the air filter. An adjusting screw with its end abutting against the throttling valve block is threaded onto the plug.

[0010] The present invention is further configured such that: the end of the throttle valve block facing away from the air filter element has a guide cone that extends into the air inlet.

[0011] The present invention is further configured such that the elastic element is a rectangular spring.

[0012] The present invention is further configured such that the adjusting screw is arranged around the periphery of the air inlet.

[0013] The present invention is further configured such that: the end of the throttle valve block facing the air filter element has an elastic element positioning groove.

[0014] 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.

[0015] The present invention is further configured such that a sealing ring is provided on the retaining ring and the air filter element.

[0016] The present invention is further configured such that the edge of the tray has a positioning guard.

[0017] 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.

[0018] In summary, this utility model has the following beneficial effects:

[0019] 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.

[0020] 2. Dynamically allocating the filtration load reduces main filter contamination, extending the replacement cycle in dusty environments and reducing consumable costs and downtime losses.

[0021] 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

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a partial structural schematic diagram of the present invention;

[0024] Figure 3 This is a schematic diagram illustrating the structure of the throttle valve block in this utility model;

[0025] Figure 4 yes Figure 3 A structural diagram from another perspective. Detailed Implementation

[0026] 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.

[0027] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0028] Example 1

[0029] See Figures 1 to 4 As shown, the pre-filter with adjustable flow rate 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.

[0030] The air intake 5 and the air filter 8 are arranged on the same axis. The baffle ring 9 is filled with a throttle valve block 10 whose outer wall is close to the inner wall of the baffle ring. The throttle valve block 10 moves axially relative to the baffle ring 9. The edge of the throttle valve block 10 is surrounded by throttle holes 11 that pass through along the axial direction. An elastic element 12 is provided between the throttle valve block 9 and the air filter 8. The elastic element 12 is a rectangular spring. The plug 4 is threaded with an adjusting screw 13 whose end abuts against the throttle valve block. The adjusting screw 13 is arranged around the periphery of the air intake.

[0031] Furthermore, the end of the throttle valve block 10 facing the air filter element has an elastic element positioning groove 15.

[0032] Furthermore, the opening 3 is provided with a lower mounting plate 16 connected to the filter housing, and the plug 4 is provided with an upper mounting plate 17 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 18 passing through the bolt holes and nuts 19 threaded onto the bolts 18.

[0033] Furthermore, a sealing ring 20 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 turning the adjusting screw 13 downward, the throttle valve block 9 is pressed downward, and the elastic element 12 deforms and compresses, reducing the distance between the throttle valve block 10 and the air filter element 8, thereby reducing the flow rate and achieving the effect of reducing flow and speed. By turning the adjusting screw 13 upward, the elastic element 12 deforms and resets, pressing the throttle valve block 9 upward, increasing the distance between the throttle valve block 10 and the air filter element 8, thereby increasing the flow rate and achieving the effect of increasing flow and speed.

[0036] The elastic element positioning groove 15 is used to position the elastic element 12 during installation.

[0037] The sealing ring 20 enhances the sealing performance between the retaining ring 9 and the air filter element 8.

[0038] Example 2

[0039] See Figures 1 to 4 As shown, the flow-adjustable pre-filter involved in this embodiment is further configured, based on embodiment 1, with the throttle valve block 10 having a guide cone 14 extending into the air inlet at one end facing away from the air filter element.

[0040] In this embodiment, the guide cone 14 is used to guide the incoming air.

[0041] Example 3

[0042] See Figures 1 to 4 As shown, the flow-adjustable pre-filter involved in this embodiment is further configured, based on embodiment 1, with the edge of the tray 6 having a positioning stop 21.

[0043] In this embodiment, the positioning baffle 21 is used as a peripheral barrier to enable the air filter 8, which is placed vertically on the tray 6, to be quickly positioned.

[0044] The pre-filter with adjustable flow rate 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 flow-adjustable prefilter comprising a filter housing in a rotary structure, the bottom of the filter housing having an exhaust nozzle, 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 inlet and the air filter are arranged on the same axis. A throttling valve block with its outer wall tightly attached to the inner wall of the baffle ring is filled inside the baffle ring. The throttling valve block moves axially relative to the baffle ring. Throttling holes that pass through the axial direction are distributed around the edge of the throttling valve block. An elastic element is provided between the throttling valve block and the air filter. An adjusting screw with its end abutting against the throttling valve block is threaded onto the plug.

2. The flow-regulatable prefilter of claim 1, wherein: The end of the throttle valve block facing away from the air filter has a guide cone that extends into the air intake.

3. The flow-regulatable prefilter according to claim 1 or 2, characterized in that: The elastic element is a rectangular spring.

4. The flow-regulatable prefilter of claim 3, wherein: The adjusting screws are arranged around the periphery of the air intake.

5. The flow-regulatable prefilter of claim 4, wherein: The end of the throttle valve block facing the air filter has an elastic positioning groove.

6. The flow-regulatable prefilter of claim 1, wherein: 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.

7. The flow-regulatable prefilter of claim 1, wherein: A sealing ring is provided on the retaining ring and the air filter element.

8. The flow-regulatable prefilter of claim 1, wherein: The edge of the tray has a positioning guard.

9. The flow-regulatable prefilter of claim 1, wherein: The supporting ribs are arranged in a ring array with equal intervals around the axis of the filter housing.

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