Pressure reducing valve

Abstract

The utility model discloses a pressure reducing valve which comprises a pressure reducing valve body and a sealing shaft, the pressure reducing valve body is provided with a central shaft hole, the sealing shaft is movably connected with the central shaft hole, one side of the pressure reducing valve body is provided with a pressure discharging hole, the pressure discharging hole is communicated with the central shaft hole, the bottom of the central shaft hole is provided with a taper hole, and the sealing shaft is correspondingly provided with a plug. And the plug is matched with the taper hole. The pressure reducing valve is installed on the engine cylinder, when an engine is started, a pressing cap of the pressure reducing valve is pressed down, the sealing shaft drives the plug to descend, the bottom of the center shaft hole is communicated with an engine cylinder combustion chamber, part of mixed gas in the cylinder combustion chamber is discharged through the pressure discharging hole, and pressure in the combustion chamber is reduced. When the engine is started, rebound pressure is reduced, and a machine can be easily started; after the engine is started, combustion gas in the combustion chamber expands to push the sealing shaft to jack upwards, so that contact sealing of the plug and the taper hole is achieved, the compression ratio of the engine is recovered, and normal work of the engine is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of engine equipment, and particularly relates to a pressure reducing valve. BACKGROUND

[0002] A two-stroke engine refers to an engine in which a piston reciprocates once for each rotation of a crankshaft, and its working cycle still includes four processes of intake, compression, work and exhaust.

[0003] The two-stroke engine, in particular, relates to a two-stroke garden tool engine, in the prior art, when the two-stroke garden tool engine is started, especially a large-displacement engine with a large compression ratio, the engine is difficult to start or the cylinder is flooded, and the starting handle is easily detached to injure the user's fingers. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the above technical problems in the prior art, and provides a pressure reducing valve, which is installed on an engine cylinder, when the engine is started, a pressing cap of the pressure reducing valve is pressed down, the sealing shaft drives the plug to descend, the bottom of the central shaft hole is communicated with a combustion chamber of the engine cylinder, a part of mixed gas in the cylinder combustion chamber is discharged through the pressure discharge hole, the pressure in the combustion chamber is reduced, the rebound pressure is reduced when the engine is started, and the machine is easily started; after the engine is combusted, the combustion gas expands to push the sealing shaft upward, the plug is in contact with the tapered hole for sealing, the compression ratio of the engine is restored, and the normal work of the engine is ensured.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A pressure reducing valve comprises a pressure reducing valve body and a sealing shaft, the pressure reducing valve body is provided with a central shaft hole, the sealing shaft is movably connected with the central shaft hole, one side of the pressure reducing valve body is provided with a pressure discharge hole, the pressure discharge hole is communicated with the central shaft hole, the bottom of the central shaft hole is provided with a tapered hole, the sealing shaft is correspondingly provided with a plug, and the plug is matched with the tapered hole. The utility model is installed on the engine cylinder, when the engine is started, the pressing cap of the pressure reducing valve is pressed down, the sealing shaft drives the plug to descend, the bottom of the central shaft hole is communicated with the combustion chamber of the engine cylinder, a part of mixed gas in the cylinder combustion chamber is discharged through the pressure discharge hole, the pressure in the combustion chamber is reduced, the rebound pressure is reduced when the engine is started, and the machine is easily started; after the engine is started, the combustion gas in the combustion chamber expands to push the sealing shaft upward, the plug is in contact with the tapered hole for sealing, the compression ratio of the engine is restored, and the normal work of the engine is ensured.

[0007] Further, the top of the sealing shaft is provided with a pressing cap. The sealing shaft and the pressing cap are integrally formed by injection molding, and the pressing cap is convenient for controlling the movement of the sealing shaft.

[0008] Further, a limiting piece is arranged between the pressure reducing valve body and the sealing shaft, and the limiting piece is used for limiting the sealing shaft.

[0009] Further, the limiting piece comprises a limiting cover, a spring and a steel ball, the top of the pressure reducing valve body is provided with a stage, the outer side wall of the stage is circumferentially provided with mounting holes, the mounting holes are communicated with the central shaft hole, the spring and the steel ball are arranged in the mounting holes, the limiting cover is arranged on the outer side of the stage and seals the mounting holes, one end of the spring is abutted against the inner wall of the limiting cover, the other end of the spring is abutted against the steel ball, the sealing shaft is provided with an arc-shaped groove corresponding to the steel ball, the sealing shaft is provided with a conical section below the arc-shaped groove, and the diameter of the conical section gradually decreases from top to bottom. The limiting cover is arranged in cooperation with the sealing shaft, the spring and the steel ball are limited in the mounting holes, after the engine is started and the sealing shaft is pressed down by pressing the cap, the sealing shaft is lowered, the spring pushes the steel ball, and the steel ball is limited in the arc-shaped groove of the sealing shaft; after the engine is started, the combustion gas in the combustion chamber expands and pushes the sealing shaft upward, so that the sealing shaft pushes the steel ball back into the mounting hole, the plug of the sealing shaft seals the conical hole, the spring pushes the steel ball, and the steel ball is limited on the conical section.

[0010] Further, the outer side wall of the bottom of the pressure reducing valve body is provided with external threads, and the pressure reducing valve body is screwed with the engine cylinder through the external threads. The external threads are arranged for mounting and fixing the pressure reducing valve.

[0011] Further, the outer wall of the pressure reducing valve body is integrally formed with an outer hexagonal nut sleeve, and the outer hexagonal nut sleeve is located above the external threads. The outer hexagonal nut sleeve is arranged to facilitate screwing the pressure reducing valve body onto the engine cylinder, facilitate applying force to the pressure reducing valve body to tighten it on the engine cylinder, and does not damage the structure of the pressure reducing valve body.

[0012] Further, a sealing groove is formed between the outer hexagonal nut sleeve and the external threads, and a sealing piece is arranged in the sealing groove. The sealing piece is arranged to realize the sealing property of the connection between the pressure reducing valve body and the engine cylinder.

[0013] The utility model discloses have the following beneficial effects because of adopting the above technical scheme:

[0014] The utility model discloses install the pressure reducing valve on the engine cylinder, press down the pressing cap of the pressure reducing valve when starting the engine, make the sealing shaft drive the plug to descend, thereby make the bottom of the central shaft hole and the combustion chamber of the engine cylinder communicate, and the mixed gas in the cylinder combustion chamber is discharged partially through the pressure relief hole, makes the pressure in the combustion chamber reduce, reduces the rebound pressure when starting the engine, and the machine is started easily, after the engine starts, the combustion gas in the combustion chamber expands and pushes the sealing shaft upward, thereby realizes the plug and the conical hole contact seal, and the engine compression ratio restores, guarantees the normal work of the engine.

[0015] The limiting component in this utility model includes a limiting cover, a spring, and a steel ball. The top of the pressure reducing valve body has a stepped platform. Mounting holes are distributed circumferentially on the outer wall of the platform, communicating with the central shaft hole. The spring and steel ball are both located within the mounting holes. The limiting cover covers the outer side of the platform and seals the mounting holes. One end of the spring abuts against the inner wall of the limiting cover, and the other end abuts against the steel ball. A sealing shaft has an arc-shaped groove corresponding to the steel ball, and a conical section is located below the arc-shaped groove on the sealing shaft. The diameter of the conical section gradually decreases from top to bottom. The limiting cover, in conjunction with the sealing shaft, limits the spring and steel ball within the mounting holes. When the engine is started and the sealing shaft is pressed down by the pressing cap, the sealing shaft descends, and the spring pushes the steel ball, limiting it within the arc-shaped groove of the sealing shaft. When the engine starts, the combustion gas in the combustion chamber expands, pushing the sealing shaft upwards, causing the sealing shaft to press the steel ball back into the mounting hole. After the plug of the sealing shaft seals the conical hole, the spring pushes the steel ball, limiting it on the conical section. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a pressure reducing valve according to the present invention;

[0018] Figure 2 This is a schematic diagram of the connection between the pressure reducing valve and the engine cylinder in this utility model;

[0019] Figure 3 for Figure 1 The front view;

[0020] Figure 4 for Figure 3 Cross-sectional view;

[0021] Figure 5 This is a cross-sectional view of the plug when it is closed in this utility model.

[0022] In the diagram, 1-pressure reducing valve body; 2-sealing shaft; 3-central shaft hole; 4-pressure discharge hole; 5-conical hole; 6-plug; 7-press cap; 8-limiting element; 9-limiting cover; 10-spring; 11-steel ball; 12-stage; 13-mounting hole; 14-arc groove; 15-conical section; 16-external thread; 17-external hexagonal nut sleeve; 18-sealing groove; 19-seal element; 20-engine cylinder. Detailed Implementation

[0023] like Figures 1 to 5As shown, the utility model relates to a pressure reducing valve, including pressure reducing valve main body 1 and sealing shaft 2, pressure reducing valve main body 1 is equipped with central shaft hole 3, sealing shaft 2 is movably connected with central shaft hole 3, one side of pressure reducing valve main body 1 is equipped with pressure relief hole 4, and pressure relief hole 4 is communicated with central shaft hole 3, and the bottom of central shaft hole 3 is equipped with taper hole 5, and sealing shaft 2 is correspondingly equipped with plug 6, and plug 6 is matched with taper hole 5.

[0024] The top of sealing shaft 2 is equipped with press cap 7. Sealing shaft 2 and press cap 7 are integrally formed by injection molding, and the setting of press cap 7 facilitates the control of the movement of sealing shaft 2.

[0025] Limiting piece 8 is arranged between pressure reducing valve main body 1 and sealing shaft 2, and limiting piece 8 is used for limiting sealing shaft 2. The setting of limiting piece 8 plays a limiting role on the pressed limiting piece 8, thereby improving the stability of the operation of sealing shaft 2.

[0026] Limiting piece 8 includes limiting cover 9, spring 10 and steel ball 11, the top of pressure reducing valve main body 1 is equipped with stage 12, the outer side wall of stage 12 is circumferentially distributed with mounting hole 13, mounting hole 13 is communicated with central shaft hole 3, spring 10 and steel ball 11 are both arranged in mounting hole 13, limiting cover 9 is arranged on the outer side of stage 12 and seals mounting hole 13, one end of spring 10 abuts against the inner wall of limiting cover 9, the other end of spring 10 abuts against steel ball 11, sealing shaft 2 is correspondingly provided with arc-shaped groove 14, sealing shaft 2 is provided with conical section 15 below arc-shaped groove 14, and the diameter of conical section 15 gradually decreases from top to bottom. The setting of limiting cover 9, in cooperation with sealing shaft 2, limits spring 10 and steel ball 11 in mounting hole 13, after starting the engine and pressing sealing shaft 2 through press cap 7, sealing shaft 2 descends, spring 10 pushes steel ball 11, so that steel ball 11 is limited in arc-shaped groove 14 of sealing shaft 2; after the engine is started, the combustion gas in the combustion chamber expands to push sealing shaft 2 upward, so that sealing shaft 2 pushes steel ball 11 back into mounting hole 13, after plug 6 of sealing shaft 2 seals taper hole 5, spring 10 pushes steel ball 11, so that steel ball 11 is limited on conical section 15.

[0027] The outer side wall of the bottom of pressure reducing valve main body 1 is equipped with external thread 16, and pressure reducing valve main body 1 is screwed with engine cylinder 20 through external thread 16. The setting of external thread 16 is used for the installation and fixation of the pressure reducing valve.

[0028] The outer wall of pressure reducing valve main body 1 is integrally formed with external hexagonal nut sleeve 17, and external hexagonal nut sleeve 17 is located above external thread 16. The setting of external hexagonal nut sleeve 17 facilitates the screwing of pressure reducing valve main body 1 to engine cylinder 20, facilitates the application of force to pressure reducing valve main body 1 to screw it on the engine cylinder, and does not damage the structure of pressure reducing valve main body 1.

[0029] A sealing groove 18 is formed between the outer hexagonal nut sleeve 17 and the external thread 16, and a sealing element 19 is arranged in the sealing groove 18. The sealing element 19 is arranged to realize the sealing performance of the connection between the pressure relief valve body 1 and the engine cylinder.

[0030] The utility model discloses a pressure relief valve is installed on the engine cylinder 20, when starting the engine, press down the pressing cap 7 of pressure relief valve, make sealing shaft 2 drive the plug 6 to drop, thereby make the bottom of central shaft hole 3 and engine cylinder 20 combustion chamber intercommunication, and the mixed gas in cylinder combustion chamber is discharged partly through pressure relief hole 4, make the pressure in combustion chamber reduce, and the rebound pressure is reduced when starting the engine, and the machine is started easily.

[0031] The above is only the specific embodiment of the utility model, but the technical features of the utility model are not limited to this. Any simple change, equivalent replacement or modification, etc. made on the basis of the utility model to solve the basically same technical problem and realize the basically same technical effect is covered in the protection scope of the utility model.

Claims

1. A pressure reducing valve comprising a pressure reducing valve body and a sealing shaft, characterized by: The pressure reducing valve body is provided with a central shaft hole, the sealing shaft is movably connected with the central shaft hole, one side of the pressure reducing valve body is provided with a pressure discharge hole, the pressure discharge hole is communicated with the central shaft hole, the bottom of the central shaft hole is provided with a tapered hole, the sealing shaft is correspondingly provided with a plug, and the plug is matched with the tapered hole.

2. A pressure reducing valve according to claim 1, wherein: The top of the sealing shaft is provided with a pressing cap.

3. A pressure reducing valve according to claim 1, wherein: A limiting piece is arranged between the pressure reducing valve body and the sealing shaft, and the limiting piece is used for limiting the sealing shaft.

4. A pressure reducing valve according to claim 3, wherein: The limiting piece comprises a limiting cover, a spring and a steel ball, the top of the pressure reducing valve body is provided with a stage, the outer side wall of the stage is circumferentially provided with a mounting hole, the mounting hole is communicated with the central shaft hole, the spring and the steel ball are arranged in the mounting hole, the limiting cover is arranged outside the stage and seals the mounting hole, one end of the spring abuts against the inner wall of the limiting cover, the other end of the spring abuts against the steel ball, the sealing shaft is provided with an arc-shaped groove corresponding to the steel ball, the sealing shaft is provided with a conical section below the arc-shaped groove, and the diameter of the conical section gradually decreases from top to bottom.

5. The pressure reducing valve according to claim 1, wherein: The outer side wall of the bottom of the pressure reducing valve body is provided with an external thread, and the pressure reducing valve body is screwed with the engine cylinder through the external thread.

6. A pressure reducing valve according to claim 5, wherein: The outer wall of the pressure reducing valve body is integrally formed with an outer hexagonal nut sleeve, and the outer hexagonal nut sleeve is located above the external thread.

7. A pressure reducing valve according to claim 6, wherein: A sealing groove is formed between the outer hexagonal nut sleeve and the external thread, and a sealing piece is arranged in the sealing groove.

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