Valve seat with compensation sealing structure and ball valve thereof

Abstract

The utility model provides a valve seat with a compensation sealing structure, which comprises a valve seat body, and the inner wall of one side of the valve seat body close to a valve core is provided with an annular groove which is coaxially arranged; the section of the groove is U-shaped; the side arm, right opposite to the valve element, of the groove is a sealing side arm. The outer side face of the sealing side arm makes contact with the valve element. The grooves are located in the positions close to the outer side faces of the sealing side arms. Due to the fact that the groove is located in the position close to the outer side face of the sealing side arm, the thickness of the sealing side arm is small, and the sealing side arm has elasticity. When the valve seat makes contact with the valve element, the sealing side arm elastically deforms under the combined action of the pressure of the back pressure disc spring (or spring) and auxiliary pressure generated by fluid pressure difference, the outer side face of the sealing side arm makes close contact with the valve element, and the sealing performance of the valve element is better. And when the outer side face of the sealing side arm is abraded due to repeated opening and closing of the valve element, only the deformation amplitude of the sealing side arm is reduced, and the sealing performance can still be kept under the action of elasticity of the sealing side arm.

Description

TECHNICAL FIELD

[0001] The utility model relates to control valve technical field, concretely a valve seat and ball valve with compensating sealing structure. BACKGROUND

[0002] The valve seat is the part that the valve core in the valve and its cooperation surface contact, is used for realizing the closing and adjustment of the valve, provides the support force in the full close position for the valve core, and forms the sealing pair with the valve core. The sealing performance of the valve seat is the key factor that determines the valve leakage. The valve seat sealing surface generally adopts the hard alloy hardening treatment of surfacing or cladding, improves the sealing performance. The valve seat sealing is selected according to the application working condition and medium pressure Non-metallic soft sealing or metal hard sealing. The sealing form of hard sealing valve seat and valve core has line sealing and face sealing, and the contact area of line sealing is small, and the opening and closing torque of the valve is small, and the sealing performance of face sealing is good. In the closing process, the valve seat is close to the valve core under the joint action of the elastic force of back pressure disc spring (or spring) and the medium pressure, realizes the sealing function.

[0003] The currently commonly used valve seat is all solid metal hard sealing, and the sealing surface of the valve seat has no elasticity. After the multiple abrasion of action, the sealing performance will be weakened, thereby affecting the normal use of the valve. CONTENT OF THE UTILITY MODEL

[0004] To solve the technical problems in the background art, the utility model discloses a valve seat with compensating sealing structure and ball valve thereof.

[0005] The utility model provides a valve seat with compensating sealing structure, including valve seat body, the inner wall of valve seat body opposite valve core one side is equipped with the recess that is arranged coaxially, is annular,

[0006] The recess section is U-shaped.

[0007] The side arm of the recess close to the valve core is sealing side arm, and the outer side of the sealing side arm contacts the valve core.

[0008] The recess is located close to the position of the outer side of the sealing side arm.

[0009] Because the recess is located close to the position of the outer side of the sealing side arm, the thickness of the sealing side arm is small, so that the sealing side arm has elasticity. When the valve seat contacts the valve core, the sealing side arm is elastically deformed under the joint action of the pressure of back pressure disc spring (or spring) and the auxiliary pressure generated by the fluid pressure difference, and the outer side of the sealing side arm is in close contact with the valve core, so that the sealing performance is better. Moreover, when the outer side of the sealing side arm is abraded due to the multiple opening and closing of the valve core, the deformation amplitude of the sealing side arm is only reduced, and the sealing performance can still be maintained under the action of elasticity.

[0010] Further, the groove has a circular-arc bottom. In this way, the groove is not prone to stress concentration, is easy to clean, has high structural rigidity, small deformation, and good stability.

[0011] Further, the sealing side arm contact surface of the valve core is designed as a contact surface, and the width of the groove is 1.5-2 times the width of the contact surface. If the width of the groove exceeds 2 times the width of the contact surface, the strength of the valve seat body will be reduced, and meanwhile, the excessively wide groove will cause excessive elastic deformation of the sealing surface when the valve core and the valve seat body are in operation, which is not conducive to sealing. If the width of the groove is less than 1.5 times the width of the contact surface, the elasticity of the outer side wall will be insufficient, and the sealing compensation function will not be achieved.

[0012] If the depth of the groove is too shallow, the elastic deformation amplitude generated thereby is too small, and the sealing compensation function cannot be achieved. If the depth of the groove is too deep, the strength of the valve seat body will be affected. Further improvement is that the depth of the groove is between 0.5-0.7 times the thickness of the valve seat body.

[0013] When the opening of the valve is below 30%, the valve cavity will be subjected to strong fluid scouring, the hardening layer of the inner wall of the valve body will be thinned and ruptured, the valve body will be corroded more severely, and the service life will be reduced. Based on this, further improvement is that the side of the valve seat body away from the valve core is provided with a flow baffle extending towards the shaft center. The flow baffle is provided with a through hole, and the through hole is a regular polygon. In this way, when the opening of the valve is below 30%, the cross-sectional space of the flow channel is reduced, the flow velocity is increased, and the pressure is also increased. The high-speed medium is ejected from the flow channel, passes through the flow baffle, and changes the flow direction and flow velocity of the medium. The medium flows out from the gap between the flow baffle and the valve core, thereby preventing the generation of vortex flow, reducing the damage of the scouring action to the valve body, improving the stability of the valve, and increasing the service life of the valve.

[0014] The utility model also provides a ball valve with the valve seat with the compensation sealing structure. In this way, the sealing performance of the ball valve is better.

[0015] The utility model discloses the beneficial effect is: when the valve seat and the valve core contact, the outer side wall produces elastic deformation under the joint action of the pressure of back pressure disc spring (or spring) and the auxiliary pressure generated by fluid pressure difference, and the outer side wall is in close contact with the valve core, so that the sealing performance is better. Moreover, when the valve core is opened and closed for many times and causes the outer side wall to wear, the outer side wall only reduces the deformation amplitude, and still can keep the sealing performance under the action of elasticity. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further explained in connection with the drawings and examples.

[0017] Figure 1 It is the front view of the ball valve;

[0018] Figure 2 is Figure 1 is an enlarged view of A in the figure;

[0019] Figure 3 is a front sectional view of the valve seat body;

[0020] Figure 4 is a structural schematic view of the valve seat body;

[0021] In the figure: 1, valve seat body; 2, valve core; 3, groove; 4, baffle; 5, back pressure disc spring; 11, sealing part; 12, intermediate part; 13, connecting part; 31, sealing side arm; 32, contact surface; 41, through hole. DETAILED DESCRIPTION

[0022] The utility model will be explained in further detail in combination with the drawings. These drawings are all simplified schematic views, and only schematically show the basic structure of the utility model, so they only show the components related to the utility model.

[0023] Example one:

[0024] As Figures 1-4 shown, the utility model discloses a valve seat with compensating sealing structure, including valve seat body 1 and valve core 2, valve seat body 1 is by the sealing part 11, intermediate part 12 and connecting part 13 of sequentially connected, diameter sequentially increases and constitutes, sealing part 11 is used for connecting valve core 2, realizes sealing;Intermediate part 12 is used for valve seat body 1 installation positioning;Connecting part 13 is used for valve seat body 1 installation fixed.

[0025] The inner wall of sealing part 11 is provided with annular groove 3 arranged coaxially with valve seat body 1;The cross section of groove 3 is U-shaped;The side arm of groove 3 close to valve core 2 is sealing side arm 31. The outer side of sealing side arm 31 is provided with contact surface 32 arranged obliquely and contacted with valve core 2. Groove 3 is located close to the position of the outer side of sealing side arm 31, so that the thickness of sealing side arm 31 is small, which has elasticity and can be deformed.

[0026] The groove bottom of groove 3 is arc transition. By setting like this, stress concentration is not easy to produce at groove 3, which is easy to clean, and has large structural rigidity, small deformation and good stability.

[0027] The width of groove 3 is 1.5-2 times of the width of contact surface 32. The reason for designing like this is that if the width of groove 3 exceeds 2 times of the width of contact surface 32, the strength of valve seat body 1 will be reduced, and the excessively wide groove 3 will make the sealing surface produce excessive elastic deformation when valve core 2 works with valve seat body 1, which is not conducive to sealing;If the width of groove 3 is less than 1.5 times of the width of contact surface 32, the elasticity of outer side wall 31 will be insufficient, and the compensating sealing function cannot be played.

[0028] The depth of the groove 3 is between 0.5-0.7 times the thickness of the sealing part 11. The reason for such design is to avoid the depth of the groove 3 being too shallow, which results in too small elastic deformation range and is difficult to compensate the sealing; and to avoid the depth of the groove 3 being too deep, which affects the strength of the valve seat body 1.

[0029] When the opening of the valve is below 30%, the valve cavity will be damaged by strong fluid scouring, so the inner wall of the connecting part 13 is provided with a baffle 4 extending to the shaft center; the baffle 4 is provided with a through hole 41 for medium flow. The through hole 41 is a regular polygon, and in the embodiment, the through hole 41 is a square. In this way, when the valve is in small opening operation, the medium in the flow passage increases in flow rate and pressure due to the small space in the cross section, and the high-speed medium is ejected from the flow passage, at this time, the medium flows through the baffle 4, the baffle 4 changes the flow direction and flow rate of the medium, and the fluid flows out from the gap between the baffle 4 and the valve core 2, thereby preventing the generation of vortex flow, reducing the damage of scouring effect on the valve body, improving the stability of the valve, and increasing the service life of the valve.

[0030] Compared with the prior art, the beneficial effects of the embodiment are that when the valve seat contacts the valve core 2, the outer side wall 31 is elastically deformed under the combined action of the pressure of the back pressure disc spring 5 and the auxiliary pressure generated by the fluid pressure difference, the sealing side arm 31 is in close contact with the valve core 2, so that the sealing performance is better; and when the valve core 2 is opened and closed for many times to cause the sealing side arm 31 to wear, the sealing side arm 31 only reduces the deformation range, and under the action of elasticity, the sealing performance can still be maintained.

[0031] Embodiment two:

[0032] As Figure 1 described, the utility model discloses a ball valve, including the valve seat with the compensation sealing structure of embodiment one. In this way, the sealing performance of the ball valve is better, and the scouring effect of the medium on the inner wall of the valve body is also reduced, which is not easy to damage.

[0033] Based on the above ideal embodiments according to the utility model, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the contents in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A valve seat with a compensating sealing structure, comprising a valve seat body (1), characterized in that: The inner wall of the valve seat body (1) opposite to the side of the valve core (2) is provided with a groove (3) arranged coaxially with the valve seat body (1) and in a ring shape; The cross section of the groove (3) is in a U shape; The side arm of the groove (3) close to the valve core (2) is a sealing side arm (31); the outer side of the sealing side arm (31) is in contact with the valve core (2); The groove (3) is located close to the outer side of the sealing side arm (31).

2. A valve seat with a compensating seal according to claim 1, characterized in that: The groove (3) is in a circular arc transition.

3. A valve seat having a compensating seal according to claim 2, wherein: The surface of the sealing side arm (31) in contact with the valve core (2) is a contact surface (32); The width of the groove (3) is 1.5-2 times the width of the contact surface (32).

4. A valve seat having a compensating seal according to claim 3, wherein: The depth of the groove (3) is between 0.5-0.7 times the thickness of the valve seat body (1).

5. The valve seat with a compensating seal according to claim 1, wherein: The side of the valve seat body (1) away from the valve core (2) is provided with a baffle (4) extending to the center; the baffle (4) is provided with a through hole (41); the through hole (41) is in a regular polygon shape.

6. A ball valve characterized by: The valve seat with the compensation sealing structure comprises any one of claims 1-5.

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