CN212928879U - Diaphragm type one-way valve - Google Patents

Abstract

The utility model relates to a check valve technical field discloses a diaphragm formula check valve, including going into air cavity I, with going into air cavity I fixed connection's play air cavity I, arrange in and go out air cavity I and go into the diaphragm I between the air cavity I, diaphragm I sets up between going into air cavity inner top face and the outer top face of play air cavity, goes into air cavity inner top face and goes out the outer top face of air cavity and all design the sphere that matches with diaphragm I, the utility model discloses simple structure, the practicality is strong, the industrial production of being convenient for has good reverse seal performance, has effectively prevented waste gas discharge, and product property can be more stable.

Description

Diaphragm type one-way valve

Technical Field

The utility model relates to a check valve technical field, in particular to diaphragm formula check valve for internal combustion engine.

Background

At present, the check valve is widely used in an engine vacuum boosting system, a crankcase ventilation system and a fuel gas evaporation system, and particularly, the crankcase ventilation system is used in a large number. The automobile crankcase ventilation system relates to energy conservation and emission reduction of an automobile engine, and the check valve is a key component of the crankcase ventilation system and ensures that the pressure of the crankcase meets the national standard requirement together with other components of the crankcase ventilation system.

At present, a diaphragm type one-way valve used by an automobile engine is installed in an air supplement pipeline behind an air filter and communicated with the atmosphere and an engine crankcase.

For convenience of understanding, referring to fig. 1, a working principle of a diaphragm type check valve commonly used in the market at present is explained, which mainly comprises an air inlet cavity 1, a diaphragm 2 and an air outlet cavity 3, wherein a plunger 4 is designed inside the air inlet cavity 1, the diaphragm 2 is provided with a diaphragm central through hole 21, the diaphragm central through hole 21 is sleeved in the plunger 4, the check valve senses pressure difference at two ends through the communication between the air inlet cavity 1 and the air outlet cavity 3, and the on-off of the check valve is controlled through the tilting and up-down movement of the edge of the diaphragm 2.

The specific working principle of the diaphragm type one-way valve is as follows:

when the air pressure in the crankcase is lower than the atmospheric pressure, namely the air pressure at the air outlet cavity 3 end of the one-way valve is lower than the air pressure at the air inlet cavity 1 end, the diaphragm 2 is under the action of vacuum negative pressure in the crankcase, the edge of the diaphragm 2 is tilted upwards and moves upwards, the one-way valve is conducted, air enters the crankcase to supplement air, and the pressure in the crankcase is kept balanced;

when atmospheric pressure in the crankcase is higher than atmospheric pressure, the atmospheric pressure that 3 ends in check valve air outlet cavity were higher than the atmospheric pressure of income chamber 1 end promptly, and diaphragm 2 receives the effect of crankcase internal gas pressure, and diaphragm 2 downstream receives the restriction of 4 bottom platforms of plunger, and diaphragm 2 is all around with the interior mesa in the chamber of income chamber 1 in close fitting contact with, will go into the airflow channel cover of air chamber 1, and the check valve ends, prevents that the waste gas in the crankcase from discharging into the atmosphere.

However, in the actual design, due to the influence of the manufacturing process precision of the parts, if the diaphragm central through hole 21 is installed in interference fit with the plunger 4, the diaphragm 2 may deform due to the influence of the stress at the interference fit position, in order to prevent the non-preset deformation of the diaphragm 2 after being sleeved in the plunger 4, generally, when the diaphragm 2 is matched with the plunger 4, a certain gap is designed between the diaphragm 2 and the plunger 4, that is, the diaphragm 2 and the plunger 4 are in clearance fit, and the design of the gap structure can allow the diaphragm 2 to freely move on the plunger 4 within a certain range with low resistance, so as to prevent the diaphragm 2 from deforming.

In the operating condition, as above the design of diaphragm 2 and plunger 4's cooperation structure, when diaphragm 2 received the reverse atmospheric pressure of crankcase, the atmospheric pressure that goes out the 3 ends of air cavity promptly was higher than the atmospheric pressure that goes into the 1 end of air cavity, and gas can scurry out from the centre clearance, leads to the reverse not fine ending of check valve, and reverse leakage volume is difficult to accurate control to cause the waste gas in the crankcase to discharge into in the atmosphere.

In conclusion, how to not only ensure the smoothness of air inlet when the crankcase is under negative pressure, but also effectively ensure the air tightness of the product when the crankcase is under positive pressure, so as to achieve the purpose of preventing waste gas in the crankcase from being discharged into the atmosphere, and the problem needs to be solved by technical personnel in the field at present.

Disclosure of Invention

The utility model aims at providing a diaphragm formula check valve solves the check valve product and seals badly, leads to waste gas to discharge into atmospheric problem.

In order to solve the technical problem, the technical scheme provided by the invention is that the diaphragm type one-way valve comprises a diaphragm I, and an air inlet cavity I and an air outlet cavity I which are matched with the diaphragm I, wherein the air inlet cavity I is fixedly connected with the air outlet cavity I.

The diaphragm I is an integral circular surface, and no through hole is formed in the diaphragm I.

The diaphragm I is arranged between the top end surface in the air inlet cavity and the top end surface outside the air outlet cavity.

The top end surface in the air inlet cavity and the top end surface outside the air outlet cavity are both designed to be spherical surfaces matched with the diaphragm I.

The outer top end face of the air outlet cavity is provided with uniformly distributed through holes, namely the through holes on the top end face of the air outlet cavity.

The diaphragm I is designed to have a structure without a through hole, the risk of gas leakage at the through hole is avoided, the diaphragm I can completely cover the through hole of the gas inlet cavity I, the sealing effect of the spherical design structure matched with the diaphragm I on the top end surface in the gas inlet cavity is obvious, and the reverse sealing performance of a product is less influenced by pressure fluctuation in a crankcase.

When the I end of the air outlet cavity forms vacuum pressure, after the diaphragm I is subjected to the action of suction force, the edge deforms and is separated from the top end of the air inlet cavity to move towards the direction of the air outlet cavity I, and the one-way valve is conducted at the moment.

When the internal pressure of the end I of the air outlet cavity is large, the diaphragm I is subjected to strong air pressure thrust from the inside of the communicating pipeline crankcase of the air outlet cavity I, the diaphragm I is attached to the top end face of the air inlet cavity, the diaphragm I is closed by the through hole channel of the air inlet cavity I, and the check valve is closed at the moment.

Preferably, the outer diameter of the top end face of the air outlet cavity is larger than that of the diaphragm I.

Preferably, the maximum inner diameter of the through hole at the top end face of the air outlet cavity is larger than the outer diameter of the diaphragm I.

And a sealing ring is arranged on the outer side of the air inlet cavity I.

Preferably, the membrane I is made of a soft material, and may be made of a plastic material or a rubber material.

Preferably, the sealing ring is made of rubber material.

Preferably, the number of the through holes on the top end face of the air outlet cavity is at least two, the outer diameter of each through hole is larger than that of the diaphragm I, and air inlet blockage caused by the fact that the diaphragm I completely covers the through holes on the top end face of the air outlet cavity when air pressure is too large is prevented.

Furthermore, the side face of the air outlet cavity I is provided with a hole groove which can be communicated with a through hole on the top end face of the air outlet cavity, and the design of the hole groove ensures that the air inlet flow is smoother.

The technical scheme of the utility model also can further optimize, according to former design scheme principle, make further improvement to the shape of giving vent to anger chamber I, give vent to anger the outer fringe of chamber outer top face and do the design of sinking, make the outer top face central point of chamber of giving vent to anger keep away from its top face outer fringe.

The diaphragm one-way valve provided by the invention has the advantages of simple structure, strong practicability, convenience for industrial production, excellent reverse sealing performance, effective prevention of waste gas discharge and more stable product performance.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a typical diaphragm check valve of the prior art;

FIG. 2 is a schematic view of a diaphragm in the prior art

FIG. 3 is a schematic view of the diaphragm check valve of the present invention;

FIG. 4 is a schematic structural view of the air inlet chamber I of the present invention;

FIG. 5 is the structure schematic diagram of the air outlet cavity I of the present invention

Fig. 6 is another schematic structural diagram of the air outlet cavity I of the present invention;

in the figure: 1. an air inlet cavity; 2. a membrane; 21. a central through hole of the diaphragm; 3. an air outlet cavity; 4. a plunger; 10. an air inlet cavity I; 101. the top end surface of the air inlet cavity; 11. a membrane I; 12. a seal ring; 13. an air outlet cavity I; 131. the top end surface outside the air outlet cavity; 132. a through hole is arranged on the top end surface of the air outlet cavity; 133. and (4) a hole groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to the attached drawings 3-5, the diaphragm type one-way valve comprises a diaphragm I11, an air inlet cavity I10 and an air outlet cavity I13 which are matched with the diaphragm I11, and a sealing ring 12 arranged on the outer side of the air inlet cavity I10, wherein the air inlet cavity I10 is fixedly connected with the air outlet cavity I13, the diaphragm I11 is arranged between a top end face 101 in the air inlet cavity and a top end face 131 outside the air outlet cavity, the top end face 101 in the air inlet cavity and the top end face 131 outside the air outlet cavity are both designed into spherical surfaces matched with the diaphragm I11, and through holes are designed in the air inlet cavity I10 and the air outlet cavity I13.

When the pressure in the crankcase is lower than the atmospheric pressure, namely the air pressure at one side of the air outlet cavity I13 is lower than the air pressure at one side of the air inlet cavity I10, the diaphragm I11 in the cavity is under the action of the vacuum pressure in the crankcase, the diaphragm I11 deforms, the edge of the diaphragm I11 is separated from the top end face 101 in the air inlet cavity, air flows to the air outlet cavity I13 along the edge of the diaphragm I11 through the through hole of the air inlet cavity I10, the check valve is conducted at the moment, and the air enters the crankcase through the through hole of the air inlet cavity I10 and the through hole 132 of the top end.

When the pressure in the crankcase is higher than the atmospheric pressure, namely the air pressure at one side of the air outlet cavity I13 is higher than the air pressure at one side of the air inlet cavity I10, the diaphragm I11 is under the action of the positive pressure in the crankcase, the acting force pushes the diaphragm I11 to be tightly attached to the top end face 101 in the air inlet cavity, the air flow channel of the air inlet cavity I10 is closed, the check valve is stopped, and the waste gas in the crankcase is prevented from being discharged into the atmosphere.

In another embodiment, as shown in fig. 6, the side of the outlet cavity I13 is designed with an aperture groove 133 to ensure smooth airflow, and the size of the aperture groove 133 is determined by the working environment of the product.

The above embodiments are only a part of the preferred embodiments, and are not particularly limited thereto, and on the basis, the specific adjustment can be made according to the actual needs, so as to obtain different embodiments.

Obviously, under the guidance of this idea, those skilled in the art can make several changes to the diaphragm I11 and the outlet cavity I13 in the above embodiments according to different situations, and the size of the inner diameter of the through hole of the inlet air cavity I10 and the shape thereof can be designed according to the shape of the diaphragm I11. The sizes and the shapes of the air outlet cavity I13, the air inlet cavity I10 and the diaphragm I11 can be set according to the actual use environment.

It should be noted that the solution provided by the present invention is not limited to the application in automobiles, but can also be applied to other subjects according to its working principle.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (3)

1. The diaphragm type one-way valve comprises an air inlet cavity I (10), and is characterized by further comprising an air outlet cavity I (13) fixedly connected with the air inlet cavity I (10), and a diaphragm I (11) arranged between the air outlet cavity I (13) and the air inlet cavity I (10), wherein the diaphragm I (11) is arranged between a top end face (101) in the air inlet cavity and a top end face (131) outside the air outlet cavity, the top end face (101) in the air inlet cavity and the top end face (131) outside the air outlet cavity are both designed into spherical surfaces matched with the diaphragm I (11), and at least two through holes are designed in the air outlet cavity I (13).

2. A diaphragm type check valve according to claim 1, characterized in that said diaphragm I (11) material is rubber.

3. A diaphragm type check valve as claimed in claim 1, wherein the side of said outlet cavity I (13) is designed with a hole groove (133).

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