CN204200736U - A kind of spool-type valves - Google Patents

Abstract

A spool type reversing valve, comprising a valve body, a valve core capable of moving axially in the valve body, and driving end caps and positioning end caps arranged at both ends of the valve body; The shoulder provided on the spool covers the undercutting groove; a triangular through groove is provided in the axial direction of the spool; an annular groove is provided on one end face of the spool; A blind hole is provided at the center of the other end, and a spring is built in the blind hole; a flow limiting hole perpendicular to the axis is provided on the wall of the blind hole; a flow hole is also provided perpendicular to the axis on the valve core ; The bore diameter of the through hole is the same as that of the main oil port on the valve body. The utility model changes the flow state of the liquid by setting the ring groove, avoids the generation of vortex and pressure wave, reduces the noise of the fluid, and improves the service performance and service life of the valve; by setting the axial triangular groove, the vibration at the valve core is reduced .

Description

A spool valve

technical field

The utility model belongs to the field of hydraulic control valves, and relates to a reversing valve, in particular to a spool type reversing valve which uses the relative sliding of a valve core relative to a valve body to realize the on-off of an oil circuit or change the direction of liquid flow.

Background technique

The spool type reversing valve relies on the spool to slide axially in the valve cavity, changing the working position to make the inlet and outlet of the valve connected or disconnected, thereby changing the flow direction of a certain part of the fluid in the circuit. Generally, the spool valve consists of a valve core and a valve body. There is a cylindrical hole in the middle of the valve body, and the cylindrical valve core can slide axially in the hole. There are annular undercut grooves in the valve body hole, and each undercut groove communicates with the corresponding main oil port opened on the bottom surface of the valve body. There are also several annular grooves on the valve core, and the shoulders between the annular grooves of the valve core will When the groove is covered, the oil passage through the groove is cut off. When the shoulder does not cover the undercut groove, this passage can communicate with other passages. Because the spool can move axially in the valve body hole, some passages can be connected and other oil passages can be closed by virtue of the spool being in different positions in the valve hole.

When the reversing valve is reversing quickly, the pressure of the oil circuit will rise sharply, so that shock pressure noise will be generated; if the acceleration a generated by the actuator is large (a>0.3g) due to sudden reversing, shock pressure will be generated vibration noise. At the same time, due to the design of the undercut groove on the valve body and the annular groove on the valve core, the fluid flow in any channel will cause the pressure loss of the fluid, which is especially obvious in the application of high-speed and large-flow fluid.

Therefore, how to reduce the shock pressure noise, and reduce the pressure loss and driving force intensity is what those skilled in the art should study.

Contents of the invention

In order to overcome the deficiencies in the prior art, the utility model provides a spool type reversing valve with small pressure loss and driving force intensity, and the valve can effectively reduce the noise caused by hydraulic shock.

The utility model is realized through the following technical solutions: a slide valve type reversing valve, comprising a valve body, a valve core capable of axially moving in the valve body, and driving end caps and positioning end caps arranged at both ends of the valve body; There is an annular undercut groove in the valve body, and the shoulder provided on the valve core covers the undercut groove; a triangular through groove is opened in the axial direction of the valve core; There is an annular groove; a blind hole is provided at the center of the other end of the valve core, and a spring is built in the blind hole; a flow limiting hole perpendicular to the axis is provided on the wall of the blind hole; the valve core A flow hole is also arranged on the top perpendicular to the axis; the hole diameter of the flow hole is the same as that of the main oil port on the valve body.

In the above scheme, the relevant content is explained as follows:

1. In the above scheme, the diameter of the flow limiting hole is half of the diameter of the flow hole;

2. In the above solution, a keyway is further provided on the wall of the blind hole, and a guide key matching the keyway is extended on the positioning end cover. The guide key on the positioning end cover and the keyway on the valve core are both eccentric structures, which can effectively prevent the misassembly of the valve core;

3. In the above solution, the valve body is fixed with the driving end cap and the positioning end cap respectively via screws;

4. In the above solution, an O-ring is provided between the valve body and the driving end cap and the positioning end cap respectively;

5. In the above solution, the positioning end cover is provided with a spring positioning hole with the same center line and the same diameter as the blind hole on the valve core;

6. In the above scheme, the undercutting groove communicates with the main oil ports (P, A, B, T) on the bottom surface of the valve body, and the apertures of the main oil ports (P, A, B, T) are all the same;

7. In the above solution, the diameter of the largest part of the axial triangular channel is 1/4 of the diameter of the valve core, and the groove width of the annular groove is 1/8 of the diameter of the valve core.

Compared with the prior art, the beneficial effects of the utility model are:

1. The utility model changes the flow state of the liquid by setting the ring groove, avoids the generation of vortex and pressure wave, reduces the noise of the fluid, improves the service performance and service life of the valve; vibration;

2. In the utility model, a keyway and a flow hole with the same diameter as the main oil port of the valve body are provided on the valve core, and a guide key matched with the keyway is provided on the positioning end cover. When switching between, under the first working condition, ensure that the flow hole in the spool coincides with the center line of the main oil port of the valve body to form a through hole to realize the extremely small pressure loss transmission of the reversing valve; A restrictor hole with half the diameter of the main oil port is set on the upper part. In the state of working condition 2, the flow through the valve body is guaranteed to be reduced without affecting the use condition, and the reverse hydraulic pressure relative to the driving force is reduced. When changing from condition 2 to condition 1, the driving force can be effectively reduced.

Description of drawings

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

Fig. 2 is the end view of one end of the valve core in the utility model.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figure 1 and Figure 2, a spool type reversing valve includes a valve body 1 made of ductile iron, a valve core 2 that can move axially in the valve body, and the valve core 2 is made of high-alloy structural steel. It has good wear resistance, linear expansion coefficient and small deformation. In order to improve the strength of the valve core, the surface of the material must reach a certain hardness (generally required to be greater than 58HRC); and the driving end set at both ends of the valve body 1 Cover 3 and positioning end cap 4; the valve body 1 is provided with an annular undercutting groove 5, and the shoulder 6 provided on the valve core 2 covers the undercutting groove 5; the number of undercutting grooves 5 and the shoulder The number of 6 is directly related to the function, performance, volume and process of the valve.

A triangular channel 7 is opened in the axial direction of the valve core 3; an annular groove 8 is opened on one end surface of the valve core 3; a blind hole 9 is provided at the center of the other end of the valve core 2 , the blind hole 9 is provided with a spring 10; the wall of the blind hole 9 is provided with a restrictor hole 11 perpendicular to the axis; the valve core 2 is also provided with a flow hole 12 perpendicular to the axis; The aperture of the flow hole 12 is the same as that of the main oil port on the valve body.

The diameter of the restricting hole 11 is half of the diameter of the flow hole 12 .

A keyway 13 is also provided on the wall of the blind hole 9 , and a guide key 14 matching the keyway 13 is extended on the positioning end cover 4 . Both the guide key 14 on the positioning end cover 4 and the keyway 13 on the valve core 2 are eccentric structures, which can effectively prevent the incorrect assembly of the valve core.

The valve body 1 is respectively fixed with the driving end cover 3 and the positioning end cover 4 via screws.

An O-ring sealing ring (not shown in the figure) is provided between the valve body 1 and the driving end cover 3 and the positioning end cover 4 respectively.

The positioning end cover 4 is provided with a spring positioning hole 41 having the same centerline and diameter as the blind hole 9 on the valve core 2 .

The undercut groove 3 communicates with the main oil ports (P, A, B, T) on the bottom surface of the valve body 1, and the main oil ports (P, A, B, T) have the same aperture.

The diameter of the largest part of the axial triangular channel 7 is 1/4 of the diameter of the valve core 2 , and the groove width of the annular groove 8 is 1/8 of the diameter of the valve core 2 .

The utility model changes the flow state of the liquid by setting the ring groove, avoids the generation of vortex and pressure wave, reduces the noise of the fluid, and improves the service performance and service life of the valve; by setting the axial triangular groove, the vibration at the valve core is reduced . By setting a keyway on the valve core and a flow hole with the same diameter as the main oil port of the valve body, and a guide key matching the keyway on the positioning end cover, when switching between working conditions 1 and 2 , in working condition 1, ensure that the flow hole in the spool coincides with the center line of the main oil port of the valve body to form a through hole to realize the extremely small pressure loss transmission of the reversing valve; and set a diameter on the spool The restrictor hole in half of the main oil port, in the state of working condition 2, ensures that the flow through the valve body is reduced without affecting the use condition, and the reverse hydraulic pressure relative to the driving force is reduced. From working condition 2 to working condition During the conversion of Case 1, the size of the driving force can be effectively reduced.

The utility model described above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model shall be Included within the protection scope of the present utility model.

Claims (7)

1. A spool type directional control valve, comprising a valve body, a valve core that can move axially in the valve body, and driving end caps and positioning end caps arranged at both ends of the valve body; an annular sinking groove is arranged in the valve body , the shoulder provided on the valve core covers the undercut groove; it is characterized in that: a triangular through groove is provided in the axial direction of the valve core; an annular groove is provided on one end surface of the valve core; A blind hole is provided at the center of the other end of the valve core, and a spring is built in the blind hole; a restrictor hole perpendicular to the axis is provided on the wall of the blind hole; A flow hole is also provided; the hole diameter of the flow hole is the same as that of the main oil port on the valve body. 2. A spool type reversing valve according to claim 1, characterized in that: the diameter of the restricting hole is half of the diameter of the flow hole. 3. A spool type reversing valve according to claim 1, wherein a keyway is provided on the wall of the blind hole, and a keyway matching the keyway is extended on the positioning end cover. Navigation keys. 4 . The spool type reversing valve according to claim 1 , wherein the valve body is integrally fixed with the driving end cover and the positioning end cover via screws. 5 . 5 . The spool type reversing valve according to claim 1 , wherein O-rings are respectively provided between the valve body and the driving end cap and the positioning end cap. 5 . 6 . The spool type reversing valve according to claim 1 , wherein a spring positioning hole with the same center line and the same diameter as the blind hole on the valve core is provided on the positioning end cover. 6 . 7. A spool type reversing valve according to claim 1, characterized in that: the undercut groove communicates with the main oil port (P, A, B, T) on the bottom surface of the valve body, and the main port The ports (P, A, B, T) have the same bore diameter.