Respirator with oil baffle cover for fuel injection pump speed regulator

Abstract

The utility model discloses a respirator with an oil baffle cover for a fuel injection pump speed regulator, which relates to the field of respirator structures and comprises a respirator body, a mounting groove coaxially arranged at the top of the respirator body, a vent hole coaxially penetrating through the respirator body and connected with the mounting groove, and a blank cap arranged in the mounting groove. The respirator further comprises an oil blocking cover which is coaxially arranged at the bottom of the respirator body, and the two communicating grooves are symmetrically formed in the two ends of the oil blocking cover and connected with the vent hole. The breather is effectively prevented from leaking oil by improving the structure of the vent hole and adding the oil baffle cover.

Description

Technical Field

[0001] This utility model relates to the field of breather structure, specifically a breather for an injection pump speed regulator with an oil baffle cover. Background Technology

[0002] In fuel injection pump governors, splash lubrication (also known as self-lubrication) is a common lubrication method. In this method, the lubricating oil chamber inside the fuel injection pump governor achieves pressure balance with the atmosphere through a breather to avoid seal failure or component damage caused by air pressure difference.

[0003] A breather typically consists of a breather body, a vent cap, and a dustproof metal mesh. The breather body has a straight vent hole and several small vent holes evenly distributed around its circumference. The vent cap has a vent groove. The vent cap is press-fitted to the breather body, with a layer of dustproof metal mesh in between, allowing the lubricating oil chamber of the fuel injection pump governor to communicate with the atmosphere.

[0004] Under normal circumstances, the respirator with this structure can meet the usage requirements. That is, when the lubricating oil quality and the oil level in the lubricating oil chamber are normal, the lubricating oil will not flow out from the ventilation groove of the respirator, and there will be no oil leakage from the respirator.

[0005] However, when the fuel injection pump is used in a diesel engine with a relatively high speed, the centrifugal force of the flyweight inside the governor increases due to the increased engine speed, leading to an increase in the speed and frequency of lubricating oil splashing. Oil bubbles easily form in the vent hole, and under the action of pressure difference, the oil bubbles move upward and eventually break through the dustproof metal mesh and overflow from the vent groove, causing oil leakage.

[0006] To address the problems existing in the prior art, this utility model provides a breather for a fuel injection pump governor with an oil baffle cap. By improving the structure of the vent hole and adding an oil baffle cap, the breather effectively prevents oil leakage. Utility Model Content

[0007] The purpose of this invention is to provide a breather for an injection pump speed regulator with an oil baffle cover, which can prevent the formation of oil bubbles in the vent hole and prevent oil droplets in the lubricating oil chamber from splashing onto the dustproof metal wire mesh, thereby preventing oil leakage from the breather.

[0008] The above-mentioned optimized structure of this utility model is achieved through the following technical solution: A breather for an injection pump speed governor with an oil baffle cover, comprising a breather body;

[0009] The mounting slot is coaxially disposed on the top of the respirator body;

[0010] A vent hole coaxially passes through the respirator body and is connected to the mounting groove;

[0011] A cap, wherein the cap is disposed within the mounting groove;

[0012] It also includes an oil baffle, which is coaxially disposed at the bottom of the respirator body;

[0013] Two connecting grooves are symmetrically arranged at both ends of the oil baffle and connected to the vent hole.

[0014] In some embodiments, the system further includes a plurality of vent holes, which are arranged in a ring around the outside of the vent hole and penetrate the bottom wall of the mounting groove.

[0015] In some embodiments, the vent hole includes a top hole, which is coaxially disposed at the bottom of the mounting groove;

[0016] A bottom hole is coaxially disposed at the bottom of the top hole and connected to the communicating groove.

[0017] In some embodiments, the diameter of the bottom hole is smaller than the diameter of the top hole.

[0018] In some embodiments, the oil baffle is an inverted flat-topped cone.

[0019] In some embodiments, the cross-section of the connecting groove is rectangular.

[0020] In some embodiments, a dustproof metal mesh is also included, which is disposed in the mounting groove and at the bottom of the cover.

[0021] In summary, this utility model has the following beneficial effects:

[0022] This type of breather for an injection pump speed governor with an oil baffle cap has an oil baffle cap at the bottom of the vent hole. This cap blocks splashed oil droplets in the lubricating oil chamber, preventing them from splashing onto the cap and causing oil leakage. The vent hole is designed as a stepped hole that matches the shape of the breather body, thereby increasing the size of the vent hole and increasing the radius of curvature of the oil bubble in the vent hole. This reduces the stability of the oil bubble and forms a sudden expansion flow channel for the oil bubble in the vent hole. When the oil bubble passes through the sudden expansion section, the velocity of the oil bubble drops sharply and the pressure rises, thereby disrupting the stability of the oil bubble and causing it to rupture. This further prevents the formation of oil bubbles and thus prevents oil leakage from the breather. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This utility model Figure 1 Sectional view along the AA direction.

[0025] In the diagram: 1. Breathing apparatus body; 2. Mounting slot; 3. Vent hole; 31. Top hole; 32. Bottom hole; 4. End cap; 5. Oil baffle cap; 6. Connecting slot; 7. Vent hole; 8. Dustproof metal mesh. Detailed Implementation

[0026] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] refer to Figure 1-2 A breather for an injection pump governor with an oil baffle cap includes a breather body 1, a mounting groove 2, a vent 3, a vent cap 4, an oil baffle cap 5, and two connecting grooves 6. The breather body 1 serves as the basic structure of the breather and can be installed on the injection pump governor to achieve overall installation and support of the breather. The mounting groove 2 is coaxially located at the top of the breather body 1. The vent 3 coaxially penetrates the breather body 1 and is connected to the mounting groove 2. The vent cap 4 is located inside the mounting groove 2 and can be made of nylon material and injection molded. The vent cap 4 has a vent groove that can be connected to the vent 3 to achieve communication between the lubricating oil chamber and the atmosphere. The oil baffle cap 5 is coaxially located at the bottom of the breather body 1. The two connecting grooves 6 are symmetrically located at both ends of the oil baffle cap 5 and are connected to the vent 3. They can block oil droplets splashing in the lubricating oil chamber and prevent oil droplets from splashing onto the vent cap 4, thus preventing oil leakage.

[0028] In some embodiments, the device also includes a plurality of ventilation holes 7, which are arranged in a ring outside the ventilation hole 3. The ventilation holes 7 penetrate the bottom wall of the mounting groove 2 and can cooperate with the ventilation hole 3 to realize a multi-stage ventilation structure and enhance the ventilation effect of the respirator.

[0029] In some embodiments, the vent 3 includes a top hole 31 and a bottom hole 32. The top hole 31 is coaxially disposed at the bottom of the mounting groove 2, and the bottom hole 32 is coaxially disposed at the bottom of the top hole 31 and connected to the connecting groove 6. The dimensions of the top hole 31 and the bottom hole 32 are adapted to the shape of the respirator body 1, thereby increasing the aperture of the vent 3 and reducing the formation of oil bubbles. The diameter of the bottom hole 32 is smaller than the diameter of the top hole 31, which can form a stepped hole structure with a sudden change in aperture, thereby forming a sudden expansion flow channel for oil bubbles, which can prevent the formation of oil bubbles. At the same time, when the oil bubble passes through the sudden expansion section, the velocity of the oil bubble drops sharply and the pressure rises, thereby destroying the stability of the oil bubble, causing it to rupture and fall back into the lubricating oil cavity.

[0030] In some embodiments, the oil baffle 5 may be an inverted flat-topped cone, which allows oil droplets to slide off the inclined surface of the oil baffle 5 when they splash onto it, thus preventing the oil droplets from accumulating on the oil baffle 5.

[0031] In some embodiments, the cross-section of the connecting groove 6 can be rectangular, which can reduce the connection area between the oil baffle 5 and the breather body 1 while ensuring the connection strength between the oil baffle 5 and the breather body 1, thereby reducing the impact of the reduced flow area between the lubricating oil cavity and the vent 3.

[0032] In some embodiments, a dustproof metal mesh 8 is also included. The dustproof metal mesh 8 is disposed in the mounting groove 2 and at the bottom of the cover 4. The dustproof metal mesh 8 can be made of 200-mesh stainless steel mesh, which can block dust and absorb oil mist by utilizing the surface tension of the metal wire, thereby further reducing oil leakage.

[0033] The specific working principle is as follows:

[0034] When oil droplets splash in the governor's lubrication chamber, the oil baffle 5 at the bottom of the vent 3 blocks the droplets, preventing them from entering the vent 3 and impacting the dustproof metal mesh 8, thus avoiding oil leakage. Since the governor's lubrication chamber is connected to the atmosphere, air in the chamber enters the bottom hole 32 through the connecting groove 6 of the oil baffle 5. After being depressurized through the top hole 31 of the stepped expansion section, the oil mist particles it carries condense and fall back due to the reduced velocity. Clean air continues to rise through the dustproof metal mesh 8 and is discharged through the vent groove on the end cap 4, achieving pressure balance.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A breather for an injection pump governor with an oil baffle cap, comprising a breather body (1). Mounting slot (2), which is coaxially disposed on the top of the respirator body (1); Ventilation hole (3), the ventilation hole (3) coaxially passes through the respirator body (1) and is connected to the mounting groove (2); A cover (4) is provided in the mounting groove (2); Its features are: It also includes an oil baffle (5), which is coaxially disposed at the bottom of the respirator body (1); Two connecting grooves (6) are symmetrically arranged at both ends of the oil baffle (5) and connected to the vent (3).

2. A breather for a fuel injection pump speed governor with an oil baffle cap according to claim 1, characterized in that: It also includes multiple ventilation holes (7), which are arranged in a ring outside the ventilation hole (3) and penetrate the bottom wall of the mounting groove (2).

3. A breather for a fuel injection pump speed governor with an oil baffle cap according to claim 1, characterized in that: The vent (3) includes a top hole (31), which is coaxially disposed at the bottom of the mounting groove (2); Bottom hole (32) is coaxially located at the bottom of top hole (31) and connected to the connecting groove (6).

4. A breather for a fuel injection pump speed governor with an oil baffle cap according to claim 3, characterized in that: The diameter of the bottom hole (32) is smaller than the diameter of the top hole (31).

5. A breather for a fuel injection pump speed governor with an oil baffle cap according to claim 1, characterized in that: The oil baffle (5) is an inverted flat-topped cone.

6. A breather for a fuel injection pump speed governor with an oil baffle cap according to claim 1, characterized in that: The cross-section of the connecting groove (6) is rectangular.

7. A breather for a fuel injection pump speed governor with an oil baffle cap according to claim 1, characterized in that: It also includes a dustproof metal mesh (8), which is located in the mounting groove (2) and at the bottom of the cover (4).

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