阅读说明：本技术 一种双级膨胀呼吸器 (Two-stage expansion respirator ) 是由 薛松 刘山宝 裴越 于 2019-12-27 设计创作，主要内容包括：本发明涉及一种双级膨胀呼吸器,包括呼吸器下层的第一级过滤稳压室、呼吸器中层的第二级膨胀稳压室和呼吸器上层的出气管,第一级过滤稳压室、第二级膨胀稳压室和出气管相互连通；所述第一级过滤稳压室为空心立柱结构,第一级过滤稳压室的底端设置金属丝球,在金属丝球周围立柱两侧对立面上分别开设进气口；所述第二级膨胀稳压室为扁平方盒子结构,第二级膨胀稳压室内设置迷宫结构；本发明克服缸盖罩里面的空间限制,将高度增加到扁平结构的两倍以上,使废气里的油雾充分沉淀,加之一系列的过滤、迷宫等技术,结果实现了废气里油气的有效分离,顺利排出较干净的废气。(The invention relates to a two-stage expansion respirator, which comprises a first-stage filtering pressure stabilizing chamber at the lower layer of the respirator, a second-stage expansion pressure stabilizing chamber at the middle layer of the respirator and an air outlet pipe at the upper layer of the respirator, wherein the first-stage filtering pressure stabilizing chamber, the second-stage expansion pressure stabilizing chamber and the air outlet pipe are communicated with each other; the first-stage filtering pressure stabilizing chamber is of a hollow upright post structure, a metal wire ball is arranged at the bottom end of the first-stage filtering pressure stabilizing chamber, and air inlets are respectively formed on opposite surfaces of two sides of the upright post around the metal wire ball; the second-stage expansion pressure stabilizing chamber is of a flat square box structure, and a labyrinth structure is arranged in the second-stage expansion pressure stabilizing chamber; the invention overcomes the space limitation in the cylinder cover, increases the height to more than twice of a flat structure, fully deposits the oil mist in the waste gas, and combines with a series of technologies such as filtration, maze and the like, thereby realizing the effective separation of oil gas in the waste gas and smoothly discharging cleaner waste gas.)

1. A double-stage expansion respirator is characterized by comprising a first-stage filtering pressure stabilizing chamber (1) at the lower layer of the respirator, a second-stage expansion pressure stabilizing chamber (2) at the middle layer of the respirator and an air outlet pipe (3) at the upper layer of the respirator, wherein the first-stage filtering pressure stabilizing chamber (1), the second-stage expansion pressure stabilizing chamber (2) and the air outlet pipe (3) are communicated with each other; the first-stage filtering pressure stabilizing chamber (1) is of a hollow upright post structure, a metal wire ball (6) is arranged at the bottom end of the first-stage filtering pressure stabilizing chamber (1), and air inlets (4) are respectively formed in opposite surfaces of two sides of an upright post around the metal wire ball (6); the second-stage expansion pressure stabilizing chamber (2) is of a flat square box structure, and a labyrinth structure (5) is arranged in the second-stage expansion pressure stabilizing chamber (2); the height from the bottom end of the first-stage filtering pressure stabilizing chamber (1) to the bottom end of the second-stage expansion pressure stabilizing chamber (2) is H1, the height from the bottom end of the second-stage expansion pressure stabilizing chamber (2) to the top end of the second-stage expansion pressure stabilizing chamber (2) is H2, the height from the bottom end of the second-stage expansion pressure stabilizing chamber (2) to the middle part of a pipe orifice of the air outlet pipe (3) is H3, and H1 is greater than H2 or H3.

2. The dual-stage expansion respirator of claim 1, wherein the H1 is 53-57mm, the H2 is 23-27mm, and the H3 is 28-32 mm.

3. The dual-stage expansion respirator of claim 1, wherein the diameter of the inlet port (4) is smaller than the orifice diameter of the outlet tube (3).

4. The dual-stage expansion respirator of claim 3, wherein the diameter of the inlet port (4) is 5-7mm and the orifice diameter of the outlet tube (3) is 12-15 mm.

5. The dual stage expansion respirator of claim 1, wherein the height from the bottom end face of the first stage filtering plenum (1) to the air inlet (4) is 1-2 mm.

6. The dual-stage expansion respirator of claim 1, wherein the combined height of H1, H2, and H3 is greater than 100 mm.

Technical Field

The invention relates to a two-stage expansion respirator, and belongs to the technical field of internal combustion engines.

Background

The waste gas in the crankcase of the internal combustion engine cannot be completely eradicated and can only be discharged outwards. Traditionally, respirators or parts called gas-oil separators are used to physically treat these exhaust gases to separate oil mist and impurities and then discharge the separated gases to the atmosphere. With the continuous improvement of the strengthening degree of the internal combustion engine, although the manufacturing technology is also improved, the exhaust gas generation source of piston air leakage still exists, meanwhile, the requirement of people on the engine is higher and higher, and the national regulation is stricter. This places even greater demands on the respirators currently in use. In general, the higher the strengthening degree of the engine, the higher the rotating speed and the power per liter, the larger the air leakage of the piston is; the larger the medium-speed and low-speed torques are, the larger the piston air leakage is. Rather, engines are currently being developed for strengthening.

The current market has a double-respirator combination mode, wherein the main respirator still keeps the original product unchanged, mature and stable; the newly added auxiliary respirator is arranged on the cylinder cover without exception. The shapes of the auxiliary respirators are different or flat, the auxiliary respirators are arranged on the inner wall of the cylinder head cover, and the working principle is a series of oil-gas separation measures such as a metal wire ball, a labyrinth and a siphon pipe; or the oil filler is arranged on the oil filler cover and is simply filtered by the metal wire ball, so that the structure is simple and low in cost; or arranged at the front end of the main respirator; or used alone. However, the effect is not ideal no matter what structure and layout: the breather outlet drips oil, complaints from users, or complicated structures are costly.

This is mainly due to the special high oil content of the exhaust gas in the cylinder head cover, and the insufficient vertical height and insufficient settling space of these assisted respirators, the oil mist of oil droplets in the exhaust gas can not be fully precipitated and settled, but is quickly discharged out of the body along with the exhaust gas.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a two-stage expansion respirator, which overcomes the space limitation in a cylinder cover, increases the height to be more than twice of a flat structure, fully deposits oil mist in exhaust gas, and adopts a series of technologies such as filtering, labyrinth and the like, so that the effective separation of oil and gas in the exhaust gas is realized, and cleaner exhaust gas is smoothly discharged.

According to the technical scheme provided by the invention: a double-stage expansion respirator comprises a first-stage filtering pressure stabilizing chamber at the lower layer of the respirator, a second-stage expansion pressure stabilizing chamber at the middle layer of the respirator and an air outlet pipe at the upper layer of the respirator, wherein the first-stage filtering pressure stabilizing chamber, the second-stage expansion pressure stabilizing chamber and the air outlet pipe are communicated with each other; the first-stage filtering pressure stabilizing chamber is of a hollow upright post structure, a metal wire ball is arranged at the bottom end of the first-stage filtering pressure stabilizing chamber, and air inlets are respectively formed on opposite surfaces of two sides of the upright post around the metal wire ball; the second-stage expansion pressure stabilizing chamber is of a flat square box structure, and a labyrinth structure is arranged in the second-stage expansion pressure stabilizing chamber; the height from the bottom end of the first-stage filtering pressure stabilizing chamber to the bottom end of the second-stage expansion pressure stabilizing chamber is H1, the height from the bottom end of the second-stage expansion pressure stabilizing chamber to the top end of the second-stage expansion pressure stabilizing chamber is H2, the height from the bottom end of the second-stage expansion pressure stabilizing chamber to the middle part of a pipe orifice of the air outlet pipe is H3, and H1 is greater than H2 or H3.

Further, the H1 is 53-57mm, the H2 is 23-27mm, and the H3 is 28-32 mm.

Further, the diameter of the air inlet is smaller than the diameter of the opening of the air outlet pipe.

Furthermore, the diameter of the air inlet is 5-7mm, and the diameter of the orifice of the air outlet pipe is 12-15 mm.

Furthermore, the height from the end surface of the bottom end of the first-stage filtering pressure stabilizing chamber to the air inlet is 1-2 mm.

Further, the total height of the H1, H2, and H3 is greater than 100 mm.

Compared with the prior art, the invention has the following advantages:

the invention changes the research direction of the existing product. The existing product is continuously researched, tested and excavated in the aspect of flat structure, the structure is more and more complex, the cost is correspondingly improved, and the obtained effect is not ideal. The invention increases the height by more than one time, and is added with a series of technical measures such as filtration, opposite impact collision, expansion and pressure stabilization, precipitation and agglomeration and the like, so that the achieved effect is relatively ideal.

The invention has simple structure, the first stage filtering pressure stabilizing chamber and the second stage expansion pressure stabilizing chamber of the main body part are injection molding parts, the parts are easy to manufacture, the installation is convenient, and the cost is lower.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Description of reference numerals: 1-first stage filtering pressure stabilizing chamber, 2-second stage expansion pressure stabilizing chamber, 3-air outlet pipe, 4-air inlet, 5-labyrinth structure, 6-metal wire ball, H1-height from bottom end of first stage filtering pressure stabilizing chamber 1 to bottom end of second stage expansion pressure stabilizing chamber 2, H2-height from bottom end of second stage expansion pressure stabilizing chamber 2 to top end of second stage expansion pressure stabilizing chamber 2, H3-height from bottom end of second stage expansion pressure stabilizing chamber 2 to middle of pipe orifice of air outlet pipe 3.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1, a two-stage expansion respirator comprises a first-stage filtering pressure stabilizing chamber 1 at the lower layer of the respirator, a second-stage expansion pressure stabilizing chamber 2 at the middle layer of the respirator and an air outlet pipe 3 at the upper layer of the respirator, wherein the first-stage filtering pressure stabilizing chamber 1, the second-stage expansion pressure stabilizing chamber 2 and the air outlet pipe 3 are communicated with each other; the first-stage filtering pressure stabilizing chamber 1 is a hollow upright post, is erected in a limited space surrounded by a rocker arm seat and a valve spring, and belongs to the lower part of a respirator structure. The bottom end of the first-stage filtering pressure stabilizing chamber 1 is provided with a metal wire ball 6, two opposite surfaces of a stand column around the metal wire ball 6 are respectively provided with an air inlet 4, and the diameter of the air inlet 4 is smaller so as to limit the air inflow. When an engine runs, waste gas in a cylinder head cover is mixed with lubricating oil sprayed from a rocker arm to form oil mist with high oil content and certain pressure, the oil mist enters a first-stage filtering pressure stabilizing chamber 1 from two air inlets 4 at the lower end of a hollow upright post in opposite directions, the two gases are filtered, collided, expanded, reduced in speed, precipitated and the like in the first-stage filtering pressure stabilizing chamber through metal wire balls 6, oil drops fall back and flow back freely, waste gas continues to flow upwards, and at the moment, the oil content in the waste gas is greatly reduced.

The second-stage expansion pressure stabilizing chamber 2 is of a flat square box structure, and a labyrinth structure 5 is arranged in the second-stage expansion pressure stabilizing chamber 2; the second stage expansion pressure stabilizing chamber 2 is positioned above the rocker arm and the valve spring, is fixed in a nameplate cavity in the cylinder cover, belongs to the middle part of a respirator structure, has larger volume and limited height H2, and is internally provided with a labyrinth structure 5. When the waste gas enters the chamber, the waste gas expands rapidly, the flow speed is reduced rapidly again, the waste gas flows through the labyrinth structure 5, oil and gas are further separated, oil drops precipitate and flow back, and the waste gas enters the gas outlet pipe 3.

The air outlet pipe 3 is arranged on the cylinder cover and is communicated with the second-stage expansion pressure stabilizing chamber 2 in an inserted mode and belongs to the upper layer part of the respirator structure, the aperture of the air outlet pipe 3 is much larger than the apertures of the two air inlets 4, so that the flow speed of an air outlet of the air outlet pipe 3 is much smaller than that of the air inlets 4, and micro oil drops are prevented from being discharged outwards quickly along with waste gas. Meanwhile, the air outlet pipe has a certain height H3, and tiny oil drops are precipitated and oil-gas separated for the last time.

After passing through the three-layer structure of the respirator, the exhaust gas has low oil content and impurities and is discharged into the atmosphere.

The height from the bottom end of the first-stage filtering pressure stabilizing chamber 1 to the bottom end of the second-stage expansion pressure stabilizing chamber 2 is H1, the height from the bottom end of the second-stage expansion pressure stabilizing chamber 2 to the top end of the second-stage expansion pressure stabilizing chamber 2 is H2, the height from the bottom end of the second-stage expansion pressure stabilizing chamber 2 to the middle part of a pipe orifice of the air outlet pipe 3 is H3, and H1 is greater than H2 or H3.

The thickness of the material is 53-57mm for H1, 23-27mm for H2 and 28-32mm for H3.

The diameter of the air inlet 4 is smaller than that of the orifice of the air outlet pipe 3; the diameter of the air inlet 4 is 5-7mm, and the diameter of the orifice of the air outlet pipe 3 is 12-15 mm.

The height between the end surface of the bottom end of the first-stage filtering pressure stabilizing chamber 1 and the air inlet 4 is 1-2 mm.

The total height of the H1, H2 and H3 is greater than 100 mm.

The working principle is as follows: the oil-gas separation is mainly researched on the oil mist precipitation mechanism, and a first-stage filtering pressure stabilizing chamber with the height of H1 is additionally designed, so that the total height of the respirator reaches H1+ H2+ H3 which is more than or equal to 100mm, and the requirements of oil mist precipitation backflow and oil-gas separation are basically met. This is the result obtained on a large number of experimental bases, with the current product having only a height of H2+ H3 and making directional changes to the work done on the second stage expansion plenum 2.

The design of the first stage filtration plenum 1 is not easy and is severely limited by the size of the space inside the head cover. For this purpose, the first-stage filtration plenum 1 is designed as an irregularly-shaped cuboid column. The column is kept with necessary clearance from the surrounding parts, is integrated with the lower body of the second-stage expansion pressure stabilizing chamber 2 by injection molding, and is fixed on the upper cover of the second-stage expansion pressure stabilizing chamber 2 by four bolts.

The second stage expansion pressure stabilizing chamber is flat hollow cuboid with height H2, has larger expansion pressure stabilizing chamber, contains labyrinth structure 5, consists of upper cover and lower body, and is fixed by four bolts.

The inner diameter of the outlet pipe 3 is far larger than the diameters of the two air inlets, and the height H3 is larger. The design aims to ensure that the pressure of the outlet of the air outlet pipe 3 is close to the atmospheric pressure, and the flow rate is far lower than that of the air inlet 4. The air outlet pipe 3 is welded on the cylinder cover, is inserted with the upper cover of the second-stage expansion pressure stabilizing chamber and is sealed by an O-shaped ring.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.