CN204663609U - Have closedly can rush sodium chamber rush sodium valve - Google Patents

Abstract

The utility model discloses a kind of have closedly can rush sodium chamber rush sodium valve, comprise valve head and valve stem, described valve stem is inner to be axially arranged with cylindrical stem along it and to rush sodium chamber and this bar portion rushes upper end, sodium chamber extends to valve stem outer end and to be communicated with valve stem and valve stem outer end is fixedly connected with valve plug screw by screw thread outward, described bar portion is rushed sodium chamber and is sealed by this valve plug screw, it can process easily and rush sodium chamber in valve, meanwhile, can conveniently supplement again when sodium metal occurs to leak.

Description

Sodium flushing valve with closable sodium flushing cavity

technical field

The utility model relates to the field of engine parts, in particular to a sodium flushing valve with a closeable sodium flushing chamber.

Background technique

In the past, the gasoline engine exhaust valve was made of solid exhaust valve, the head of the exhaust valve was made of high temperature resistant austenite material, the rod was made of martensite material, and then processed by welding, surface treatment and other processes. Exhaust valves of this structure and process can only be used on naturally aspirated gasoline engines whose exhaust temperature does not exceed 750°C. In a supercharged engine, due to the use of compressed air intake technology (specifically turbocharging, supercharging and dual supercharging), the combustion explosion pressure in the cylinder is higher than that of natural suction, and the temperature in the cylinder is also higher than that of natural gas. When the intake is high, the temperature of the exhaust valve rises accordingly. Therefore, the temperature at the exhaust valve often exceeds the allowable temperature of the material of the exhaust valve, thereby reducing the service life of the exhaust valve and reducing the heat dissipation performance. In order to solve this problem, people drill a hole in the valve stem of the exhaust valve to form a cavity. The melting point of metal sodium is 7.81°C. Under the premise of a reasonable hollow cavity volume, when the valve is working, the temperature rises rapidly. Metal sodium changes from solid to liquid at high temperature, and moves up and down in the hollow cavity to continuously scour the valve face and valve stem, effectively transfer the heat load at the end of the valve face to the valve stem, and then cool the exhaust valve through the water passage in the cylinder head , which improves the heat dissipation of the exhaust valve and effectively reduces the heat load on the valve surface. In addition, the specific gravity of metal sodium is small, the overall mass of the valve becomes smaller, and the stiffness of the valve becomes stronger. Under the same conditions, the deformation of the valve is less Small; however, there is a problem with the exhaust valve of the existing hollow sodium-filled structure: the processing of the sodium flushing cavity is relatively difficult, and at the same time, if the metal sodium of the sodium flushing leaks, it is difficult to replenish.

Therefore, in order to solve the above problems, a sodium flushing valve with a closeable sodium flushing cavity that can be conveniently processed and easily replenished can be conveniently supplemented when sodium metal leaks.

Utility model content

In view of this, the purpose of this utility model is to overcome the defects in the prior art, to provide a kind of sodium flushing chamber that can be easily processed out of the valve, and at the same time, when the metal sodium leaks, it can be conveniently replenished and has a sealable cavity. The flushing sodium valve of the flushing sodium chamber.

The sodium flushing valve with a closeable sodium flushing cavity of the utility model includes a valve head and a valve stem. The interior of the valve stem is provided with a cylindrical rod portion flushing cavity along its axial direction, and the upper end of the stem portion flushing sodium cavity extends To the outer end of the valve stem and communicate with the outside of the valve stem, and the outer end of the valve stem is fixedly connected with a valve plug through threads, and the flushing cavity of the rod part is sealed by the valve plug;

Further, the valve head is provided with a head flushing chamber coaxially connected with the rod portion flushing chamber, and the head flushing chamber is a tapered cavity, and the inner diameter of the head flushing chamber gradually increases from top to bottom. Increased, the sodium flushing cavity of the rod and the sodium flushing cavity of the head are filled with sodium;

Further, the surface of the valve stem is provided with a chrome-plated layer; the valve head is provided with a ring groove along its circumference; the ring groove is covered with a surfacing layer and the surface of the surfacing layer is a conical surface;

Further, the contact surface between the ring groove and the surfacing layer is an arc surface;

Further, the valve stem includes a shaft I fixedly connected to the valve head in the axial direction and a shaft II coaxially connected to the shaft I, the shaft I is a rotary body whose radius gradually decreases from bottom to top, and the shaft Ⅱ is a cylinder whose radius is smaller than the minimum radius of shaft Ⅰ;

Further, the bottom surface of the valve head is provided with a circular groove coaxial with the valve head;

Further, the length of the valve guide that cooperates with the sodium flushing valve with a closable sodium flushing cavity is S ₁ , and the stroke of the sodium flushing valve with a closable sodium flushing cavity relative to the valve guide is S ₂ , the said The axial length of the chrome-plated layer on the surface of the valve stem is S ₁ +S ₂ ;

Further, the valve plug is provided with a lock clip groove along the circumference, and the diameter of the lock clip groove is smaller than the inner diameter of the valve lock clip.

The beneficial effects of the utility model are: the utility model has a sodium flushing valve with a closeable sodium flushing chamber, the sodium flushing chamber in the valve is sealed by the valve bolt, and the valve bolt can be easily disassembled, the rod of this structure The inner flushing sodium cavity is easier to process, and on the other hand, it is also easy to fill with metallic sodium, and it is also convenient to replenish metallic sodium when the metallic sodium leaks.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is the structural representation of the utility model;

FIG. 2 is a partial enlarged view of A in FIG. 1 .

Detailed ways

Fig. 1 is a structural schematic diagram of the present utility model, and Fig. 2 is a partially enlarged view of A in Fig. 1, as shown in the figure, the sodium flushing valve with a closeable sodium flushing chamber in this embodiment includes a valve head 3 and A valve stem, the interior of the valve stem is provided with a cylindrical stem flushing chamber along its axial direction, and the upper end of the stem flushing chamber extends to the outer end of the valve stem and communicates with the outside of the valve stem, and the outer end of the valve stem is fixed by threads It is connected with a valve screw plug, and the sodium flushing chamber of the rod part is sealed by the valve screw plug, and the sodium flushing chamber in the valve is sealed by the valve bolt, and the valve bolt can be easily disassembled. The rod flushing chamber of this structure It is easier to process, and on the other hand, it is also easy to fill metal sodium, and it is also convenient to replenish metal sodium when metal sodium leaks.

In this embodiment, the valve head 3 is provided with a head flushing chamber coaxially connected with the rod portion flushing chamber, and the head flushing chamber is a tapered cavity, and the inner diameter of the head flushing chamber is determined by It gradually increases from top to bottom, and the sodium flushing cavity of the rod part and the sodium flushing cavity of the head are filled with sodium. The heat exchange area between the cavity and the valve head 3 is large, which can enhance the heat exchange rate between the metal sodium in the cavity and the valve head 3; on the other hand, the sodium cavity at the head can reduce the distance between the center of the end face of the valve head 3 and the cavity , so as to improve the heat dissipation in the central area of the end face of the valve head 3, so that the overall heat dissipation of the valve is uniform. On the other hand, since the structural strength of the valve stem will be reduced after the sodium flushing cavity is installed, the chrome-plated layer on the surface of the valve stem can make up for the mechanical strength of the valve stem and improve its heat resistance at the same time.

In this embodiment, the surface of the valve stem is provided with a chrome-plated layer 6; the valve head 3 is provided with a ring groove along its circumference; the ring groove is covered with a surfacing layer 2 and the surface of the surfacing layer is a cone surface. After the sodium cavity is flushed, the structural strength of the valve stem will be reduced, and the chrome-plated layer on the surface of the valve stem can compensate for the mechanical strength of the valve stem and improve its heat resistance; in addition, the surfacing layer 2 provided around the valve head 3, The surfacing layer 2 cooperates with the valve seat ring, which can effectively improve the wear of the valve head 3 .

In this embodiment, the contact surface between the ring groove 8 and the overlay layer 2 is an arc surface, which can increase the contact area between the overlay layer 2 and the valve head 3, and ensure that the overlay layer 2 and the valve head 3 Connect firmly.

In this embodiment, the valve stem includes a shaft I4 fixedly connected to the valve head 3 in the axial direction and a shaft II5 coaxially connected to the shaft I4, and the shaft I4 is a rotation whose radius gradually decreases from bottom to top. The shaft II5 is a cylinder with a radius smaller than the minimum radius of the shaft I4. The "lower end" mentioned in this article refers to the end facing the valve head 3, and the opposite end is the "upper end". The shaft I4 refers to the valve head 3 and the shaft. The transition section between Ⅱ5, this smooth transition can avoid the stress concentration of the valve stem, and at the same time, because the shaft I4 is working, its temperature gradually decreases from bottom to top, and the shaft I4 with this structure can make it dissipate heat uniform.

In this embodiment, the bottom surface of the valve head 3 is provided with a circular groove 1 coaxial with the valve head 3. This circular groove 1 is used as a part of the combustion chamber of the engine. By adjusting the size of the circular groove 1, the engine can be adjusted within a certain range. compression ratio.

In this embodiment, the length of the valve guide that cooperates with the sodium flushing valve with a closable sodium flushing chamber is S ₁ , and the stroke of the sodium flushing valve with a closeable sodium flushing chamber moving relative to the valve guide is S ₂ , the axial length of the chrome-plated layer on the surface of the valve stem is S ₁ +S ₂ , as shown in Figure 1, the dot-dash line frame area is the chrome-plated layer 6, and the chrome-plated layer 6 is used for sliding fit with the valve guide to reduce wear , in order to improve the utilization rate of the chrome-plated layer 6 and save costs, the axial length of the chrome-plated layer 6 used in this embodiment is the sum of the length of the valve guide and the valve stroke, so as to ensure that the valve stem is in contact with the valve guide during reciprocating motion. The surfaces are all covered with chrome-plated layer 6, thereby enhancing its wear resistance.

In this embodiment, the valve plug is provided with a lock clip groove 7 along the circumference, and the diameter of the lock clip groove 7 is smaller than the inner diameter of the valve lock clip, so as to ensure a reliable connection between the valve stem and the valve.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (8)

1. A sodium flushing valve with a closeable sodium flushing cavity, comprising a valve head and a valve stem, is characterized in that: the inside of the valve stem is provided with a cylindrical rod flushing sodium chamber along its axial direction and the stem flushes The upper end of the sodium chamber extends to the outer end of the valve stem and communicates with the outside of the valve stem, and the outer end of the valve stem is fixedly connected with a valve plug through threads, and the sodium chamber at the rod part is sealed by the valve plug. 2. The sodium flushing valve with a closable sodium flushing cavity according to claim 1, characterized in that: the valve head is provided with a head flushing sodium cavity coaxially connected with the rod portion sodium flushing cavity and the head The sodium flushing cavity at the part is a tapered cavity, and the inner diameter of the sodium flushing cavity at the head gradually increases from top to bottom, and the sodium flushing cavity at the rod part and the sodium flushing cavity at the head are filled with sodium. 3. The sodium flushing valve with a closeable sodium flushing chamber according to claim 2, characterized in that: the surface of the valve stem is provided with a chrome-plated layer; the valve head is provided with an annular groove along its circumference; the annular groove The inside is covered with a surfacing layer and the surface of the surfacing layer is a conical surface. 4. The sodium flushing valve with a closable sodium flushing cavity according to claim 3, characterized in that: the contact surface between the ring groove and the surfacing layer is a circular arc surface. 5. The sodium flushing valve with a closable sodium flushing cavity according to claim 4, characterized in that: the valve stem includes a shaft I fixedly connected to the valve head in the axial direction and coaxially connected with the shaft I The shaft II; the shaft I is a rotating body whose radius gradually decreases from bottom to top; the shaft II is a cylinder with a radius smaller than the minimum radius of the shaft I. 6. The sodium flushing valve with a closeable sodium flushing cavity according to claim 5, characterized in that: the bottom surface of the valve head is provided with a circular groove coaxial with the valve head. 7. The sodium flushing valve with a closable sodium flushing cavity according to claim 6, characterized in that: the length of the valve guide that cooperates with the sodium flushing valve with a closable sodium flushing cavity is S ₁ , which has The movement stroke of the sodium flushing valve of the closable sodium flushing cavity relative to the valve guide is S ₂ , and the axial length of the chrome-plated layer on the surface of the valve stem is S ₁ +S ₂ . 8. The sodium flushing valve with a closable sodium flushing cavity according to claim 7, characterized in that: said valve screw plug is provided with a lock clip groove along the circumferential direction, and the diameter of the lock clip groove is smaller than the inner diameter of the valve lock clip.