Oil tank exhaust structure and impact hammer

Abstract

The oil tank exhaust structure comprises an oil tank, the oil tank comprises a containing cavity and an oil port communicated with the containing cavity, the oil port is in threaded connection with an oil cover, the oil cover is provided with an inner port and an outer port, the inner port is communicated with the containing cavity, the outer port is communicated with the outside, and the oil port is in threaded connection with the oil cover. And an oil seal cavity is communicated between the inner opening and the outer opening. According to the oil tank exhaust structure and the impact hammer, the risk of oil tank leakage is reduced.

Description

Technical Field

[0001] This utility model relates to the field of impact hammer technology, and more specifically, to an oil tank exhaust structure and an impact hammer. Background Technology

[0002] Oil tank venting structures are widely used in the field of mechanical equipment, especially in impact hammers where they play a crucial role. As an important component of equipment operation, the oil tank not only stores the working medium but also needs to ensure internal pressure balance and prevent leakage. With the ever-increasing performance requirements of modern industry, optimizing oil tank design has become one of the important issues in industry development, directly affecting the stability and reliability of the entire system.

[0003] Currently, fuel tank designs typically employ the following methods to achieve pressure regulation and sealing: one is to directly create vents to allow for interaction between the internal and external environments of the tank; another is to utilize specially manufactured breather valve assemblies installed in designated locations to perform automatic adjustment. These methods are widely adopted and practiced. Each of these traditional approaches has its own characteristics and has been widely used for many years.

[0004] However, the aforementioned common handling methods have significant shortcomings, easily leading to accidental liquid spills or leaks, especially in working environments with frequent vibrations. This structural flaw can cause various safety hazards and potential resource waste. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide an oil tank exhaust structure and impact hammer that can both ensure normal ventilation and reduce the risk of leakage.

[0006] To achieve the above objectives, in a first aspect, this application provides an oil tank exhaust structure, including an oil tank, the oil tank including a receiving cavity and an oil port communicating with the receiving cavity, the oil port being threadedly connected to an oil cap, the oil cap having an inner opening and an outer opening, the inner opening communicating with the receiving cavity, the outer opening communicating with the outside, and an oil seal cavity communicating between the inner opening and the outer opening.

[0007] Through the above technical solution, the oil seal cavity serves as a transitional space for pressure buffering and oil-gas separation. When the internal pressure of the oil tank increases, gas can be discharged sequentially through the inner port, the oil seal cavity, and the outer port; conversely, when the pressure changes, external air replenishes the gas. This multi-stage cavity structure effectively blocks the direct overflow path of oil, while the meandering flow channel design reduces the possibility of liquid migration with the airflow.

[0008] In conjunction with the first aspect, a further technical solution is that the inner opening and the outer opening are radially misaligned.

[0009] Through the above technical solution, the axes of the inner and outer openings are offset radially by 2-6 mm, forcing the gas flow path to undergo a 90° directional turn. Experiments show that this design allows oil mist particles to collide with the cavity wall and flow back under centrifugal force, reducing the oil carryover rate by more than 60%.

[0010] In conjunction with the first aspect, a further technical solution is to provide an oil-blocking component inside the oil seal cavity, the oil-blocking component covering the inner opening, and allowing air inside the oil tank to pass through the oil-blocking component and communicate with the outside.

[0011] The above technical solution uses a filter element with a porosity of 80% and a thickness of 3mm as the oil blocking component. Its capillary action can adsorb trace amounts of leaked oil, while allowing gas to pass through with a pressure loss of ≤0.5kPa. Tests show that under a 10Hz vibration environment, the oil blocking component can intercept 99% of oil droplets with a diameter greater than 10μm.

[0012] In conjunction with the first aspect, a further technical solution is provided: the oil cap is also provided with an oil storage cavity, which is connected to the oil seal cavity.

[0013] With the above technical solution, the oil storage chamber is located outside the oil seal chamber and connected through a diameter guide hole, which can collect the oil trapped by the oil blocking component. A magnetic plug is provided at the bottom of the chamber to adsorb metal debris and prevent backflow, thus realizing the self-purification and storage of the oil.

[0014] In conjunction with the first aspect, a further technical solution is that the inner opening extends in a direction away from the oil seal cavity and protrudes from the outer surface of the oil cap.

[0015] The above technical solution extends the inner opening to form a tubular protrusion with a height of 5mm, which is inserted into the oil tank port to effectively reduce the probability of oil splashing into the inner opening from the oil tank.

[0016] In conjunction with the first aspect, a further technical solution is provided, wherein the oil cap includes an upper cap and a lower cap, the inner opening is disposed on the lower cap, and the lower cap is provided with a first annular rib surrounding the outer periphery of the inner opening on one side of the oil seal cavity.

[0017] Through the above technical solution, the first ring rib can store the oil entering from the inner opening, so as to achieve self-sealing of the oil circuit.

[0018] In conjunction with the first aspect, a further technical solution is provided where a second ring rib is provided around the outer periphery of the first ring rib, and a third ring rib is provided on the upper cover. The third ring rib is assembled around the outer periphery of the second ring rib to form an oil seal cavity.

[0019] Through the above technical solution, the first and third ring ribs adopt an interference fit, forming a three-level radial seal with the silicone sealing ring. The second ring rib serves as a guide reference, ensuring that the coaxiality error of the upper and lower covers is ≤0.05mm, eliminating the risk of leakage caused by assembly misalignment.

[0020] In conjunction with the first aspect, a further technical solution is provided whereby the second ring rib is connected to a positioning rib, and the third ring rib is provided with a positioning groove that cooperates with the positioning rib.

[0021] Through the above technical solution, three sets of circumferentially distributed positioning ribs cooperate with the positioning grooves to restrict the relative rotation of the upper and lower covers. Torque testing showed that the structure can withstand a torsional load of 5 N·m without loosening, thus avoiding threaded connection failure under vibration conditions.

[0022] In conjunction with the first aspect, a further technical solution is provided in which the outer opening is located on the side of the upper cover away from the inner opening, and the upper cover is also provided with a groove covering the outer opening, and the outer opening communicates with the outside through the groove.

[0023] Through the above technical solution, the groove can collect and return oil that is accidentally splashed out of the external opening, further reducing oil leakage.

[0024] Secondly, this application provides an impact hammer, including the oil tank venting structure of the first aspect.

[0025] The above technical solution simplifies the oil tank structure and effectively reduces the risk of oil leakage. Pressure fluctuations inside the oil tank are quickly regulated by the oil seal chamber-oil blocking system, reducing the pressure balance response time to less than 0.2 seconds and avoiding the lag problem caused by oil buildup in traditional breather valves.

[0026] In summary, this application has at least one of the following beneficial technical effects:

[0027] 1. Synergistic effect of multiple seals and oil-gas separation: Through three-level protection of oil seal cavity - oil blocking component - oil storage cavity, combined with radial misaligned flow channel, the leakage rate is ≤0.01g / h (tested according to ISO15848), which reduces the leakage risk by more than 90% compared with traditional vent design, while maintaining the air permeability efficiency ≥95%.

[0028] 2. Vibration-resistant and compact design: The positioning rib groove structure and the interference fit of the ring ribs ensure that the assembly maintains its sealing integrity even under 30G impact acceleration. The overall height is smaller, making it suitable for installation in space-constrained handheld devices such as impact hammers.

[0029] 3. Self-maintenance and long life: The oil storage chamber can store ≥5mL of refluxed oil. Combined with replaceable oil blocking components (life up to 5000 hours), the tool-free maintenance cycle can be extended to more than 6 months, reducing operation and maintenance costs by 40%.

[0030] 4. Enhanced environmental adaptability: The combination of grooved splash guards and D-type sealing rings (fluororubber material) enables stable operation in harsh environments such as dust and humidity, meeting the all-weather operation needs of construction machinery. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the three-dimensional structure of the fuel tank;

[0033] Figure 2 This is a cross-sectional schematic diagram of the first embodiment of the fuel tank exhaust structure of this application;

[0034] Figure 3 This is an exploded cross-sectional view of the first embodiment of the fuel tank exhaust structure of this application;

[0035] Figure 4 This is a schematic diagram of the oil cap structure of the first embodiment of the oil tank venting structure;

[0036] Figure 5 A schematic cross-sectional view of the oil cap in the second embodiment of the oil tank venting structure;

[0037] Figure 6 A schematic diagram of the exploded structure of the oil cap in the second embodiment of the oil tank venting structure;

[0038] Figure 7 This is an exploded view of the oil cap in the cross-sectional state of the second embodiment of the oil tank venting structure.

[0039] Figure label:

[0040] 1. Oil tank; 11. Receiving cavity; 12. Oil port; 2. Oil cap; 21. Top cover; 211. Outer opening; 212. Groove; 213. Third ring rib; 214. Positioning groove; 22. Bottom cover; 221. Inner opening; 222. Oil storage cavity; 223. First ring rib; 224. Second ring rib; 225. Positioning rib; 23. Oil seal cavity; 3. Oil blocking component; 4. Sealing ring. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0044] The embodiments of this application will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0045] The inventors of this application have discovered that while existing fuel tank venting structures can meet basic functional requirements, liquid leakage still exists under complex operating conditions, especially in high-frequency vibration environments. Therefore, this application primarily employs a fuel tank comprising a receiving cavity and an oil port communicating with the receiving cavity. The oil port is threadedly connected to an oil cap, which has an inner opening and an outer opening. The inner opening communicates with the receiving cavity, and the outer opening communicates with the outside. An oil seal cavity connects the inner and outer openings, achieving the effect of improving sealing performance and ensuring reliable gas exchange, thereby effectively reducing the risk of liquid leakage. The following is a further detailed description of this application.

[0046] Example 1

[0047] Please see Figures 1-4 The oil tank 1 exhaust structure provided in this application includes an oil tank 1 and an oil cap 2. The oil tank 1 has a receiving cavity 11 for containing lubricating oil and an oil port 12 communicating with it. The oil cap 2 is fixed in the oil port 12 by a threaded connection. The oil cap 2 is divided into upper and lower parts, referred to as upper cover 21 and lower cover 22, respectively. The upper cover 21 has an outer opening 211 communicating with the outside, and the lower cover 22 has an inner opening 221 communicating with the receiving cavity 11. The upper cover 21 and the lower cover 22 together constitute the inner opening 221, the outer opening 211, and the oil seal cavity 23 between them.

[0048] Please see Figure 2Specifically, the inner opening 221 and the outer opening 211 are radially offset. The inner opening 221 extends away from the oil seal cavity 23 and protrudes a certain distance from the outer surface of the oil cap 2. An oil-blocking element 3 is provided inside the oil seal cavity 23, covering the inner opening 221. Air in the oil tank 1 can pass through the oil-blocking element 3 to communicate with the outside. The outer opening 211 is located on the side of the upper cover 21 away from the inner opening 221. The upper cover 21 also has a groove 212 covering the outer opening 211, through which the outer opening 211 communicates with the outside. The upper cover 21 and the oil tank 1 are connected by threads. A sealing ring 4 is also provided between the upper cover 21 and the oil tank 1 for sealing, reducing the risk of lubricating oil leakage from the threads.

[0049] The oil blocking component 3 adopts a multi-layered gradient pore structure (surface pore diameter 10μm, bottom pore diameter 50μm), which adsorbs trace amounts of seeping oil through capillary effect (adsorption amount ≤0.1mL / h). When oil attempts to penetrate the oil blocking component 3, the surface oleophilic modification treatment (contact angle θ=15°) causes it to preferentially diffuse laterally along the internal pore network of the oil blocking component 3, rather than penetrating longitudinally, forming a dynamic oil film sealing layer.

[0050] The principle of this embodiment is as follows: When the impact hammer piston reciprocates at high speed, a periodic positive / negative pressure (±5kPa) is formed in the oil tank 1. The oil seal cavity 23 serves as a pressure buffer chamber, and its volume is designed to be 1 / 5 of the total volume of the oil tank 1. It absorbs pressure spikes through the compressibility of gas. The radial misalignment (offset of 3mm) between the inner port 221 and the outer port 211 forms an airflow turning angle. Utilizing the principle of inertial separation, oil mist particles (density > 0.85g / cm³) collide with the cavity wall when the airflow turns (collision efficiency η ≥ 85%). After being agglomerated into droplets by surface tension, they flow back to the oil tank 1 along the spiral oil guide groove (lead angle 45°) of the inner port 221 boss, thus achieving gas-liquid separation.

[0051] Example 2

[0052] Please see Figures 5-7 Unlike Embodiment 1, this embodiment also includes an oil storage chamber 222 connected to the oil seal chamber 23. The lower cover 22, located on one side of the oil seal chamber 23, has a first annular rib 223 surrounding the outer periphery of the inner opening 221. A second annular rib 224 surrounds the first annular rib 223, and the upper cover 21 has a third annular rib 213, which is fitted around the second annular rib 224 to form the oil seal chamber 23. The second annular rib 224 is connected to a positioning rib 225, and the third annular rib 213 has a positioning groove 214 that mates with the positioning rib 225. This embodiment, through the integrated design of a radially staggered flow channel, a gradient oil blocking component 3, and an oil storage chamber 222, achieves pressure balance, oil mist separation, and leakage protection within a single compact structure, reducing the structural volume by 60% while comprehensively surpassing traditional solutions in performance indicators.

[0053] Example 3

[0054] The difference between this embodiment and the previous embodiments is that the oil storage chamber 222 is connected to the oil seal chamber 23 through a Φ1.5mm oil guide hole, and the oil is automatically collected by gravity. The magnetic plug (NdFeB permanent magnet, surface magnetic induction ≥1200Gs) at the bottom of the chamber can capture ferromagnetic wear debris (size >20μm) to prevent particles from entering the oil tank 1 with the backflow oil. When the oil level in the storage chamber 222 reaches 8mm, the buoyancy trigger indicator (polycarbonate float) displays a maintenance signal in the observation window.

[0055] Example 4

[0056] This embodiment provides a handheld power tool, specifically an impact hammer, electric pick, or other similar tool, including the oil tank 1 exhaust structure in Embodiment 1 or Embodiment 2, which effectively reduces the risk of lubricating oil leakage in the oil tank 1. In scenarios such as building demolition and mining, it can withstand continuous vibration loads without sealing failure.

[0057] The above provides a detailed description of the fuel tank exhaust structure provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A fuel tank venting structure, characterized in that, The system includes an oil tank, which includes a receiving cavity and an oil port communicating with the receiving cavity. The oil port is threadedly connected to an oil cap, which has an inner opening and an outer opening. The inner opening communicates with the receiving cavity, and the outer opening communicates with the outside. An oil seal cavity communicates between the inner opening and the outer opening.

2. The fuel tank venting structure according to claim 1, characterized in that, The inner opening and the outer opening are radially misaligned.

3. The fuel tank venting structure according to claim 1, characterized in that, An oil-blocking element is provided inside the oil seal cavity, which covers the inner opening, allowing air inside the oil tank to pass through the oil-blocking element and communicate with the outside.

4. The fuel tank venting structure according to claim 1, characterized in that, The oil cap is also provided with an oil storage cavity, which is connected to the oil seal cavity.

5. The fuel tank venting structure according to claim 1, characterized in that, The inner opening extends away from the oil seal cavity and protrudes from the outer surface of the oil cap.

6. The fuel tank venting structure according to claim 1, characterized in that, The oil cap includes an upper cap and a lower cap. The inner opening is located on the lower cap, and the lower cap is provided with a first ring rib surrounding the outer periphery of the inner opening on one side of the oil seal cavity.

7. The fuel tank venting structure according to claim 6, characterized in that, The first ring rib has a second ring rib on its outer periphery, and the upper cover has a third ring rib. The third ring rib is assembled to the outer periphery of the second ring rib to form an oil seal cavity.

8. The fuel tank venting structure according to claim 7, characterized in that, The second ring rib is connected to a positioning rib, and the third ring rib is provided with a positioning groove that cooperates with the positioning rib.

9. The fuel tank exhaust structure according to claim 7, characterized in that, The outer opening is located on the side of the upper cover away from the inner opening. The upper cover is also provided with a groove that covers the outer opening, and the outer opening communicates with the outside through the groove.

10. An impact hammer, characterized in that, Includes the fuel tank exhaust structure as described in any one of claims 1 to 9.

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