Valve seat structure of ball valve special for coal ash

Abstract

The utility model discloses a valve seat structure of a ball valve special for coal ash, the ball valve comprises a valve body, a ball body and a valve seat, the valve seat is arranged between the valve body and the ball body, a pre-tightening element is arranged between the valve seat and the valve body, and the valve seat structure comprises a dustproof mechanism and a sealing mechanism; the valve seat is an L-shaped valve seat, the first end face of the L-shaped valve seat is connected with the valve body and is close to the L-shaped valve seat, and the second end face of the L-shaped valve seat is close to the valve body; the dustproof mechanism is arranged on the connecting face of the L-shaped valve seat and the valve body and prevents impurities from invading the pre-tightening element. The sealing mechanism is arranged between the L-shaped valve seat and the valve body and connected with the pre-tightening element, and the sealing mechanism seals the L-shaped valve seat and the valve body. Impurities can be prevented from invading the space of the pre-tightening element, normal work of the pre-tightening element and the sealing structure is guaranteed, the sealing structure effectively prevents media from leaking, the gap design prevents the media from blocking the valve seat, the service life of the valve seat is jointly prolonged, and the maintenance requirement is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to a valve seat structure of a special coal ash ball valve. Background Art

[0002] In the complex production environment of the coal chemical industry, as a key control component, the operation stability of the valve is directly related to the continuity and efficiency of the production line. In the prior art, there are certain defects in the design of the valve seat structure of the valve in the coal chemical device: when the valve is in the working state, the medium (such as coal slurry, pulverized coal or high-temperature and high-pressure gas) may penetrate and fill the space of the elastic element inside the valve seat, which will not only cause the elastic element to gradually lose its original elasticity and sealing performance due to long-term erosion by the medium, but also may directly damage the sealing element, thus causing leakage problems; in addition, the accumulation of the medium inside the valve seat may form solidified deposits, which may cause the valve seat mechanism to jam, seriously affecting the normal opening and closing of the valve, and even completely failing, and the service life is significantly short. These problems cause the valve to only maintain normal operation within 3 to 6 months, and then it needs to enter the shutdown and maintenance stage, and cannot operate stably for a long period. Summary of the Invention

[0003] According to an embodiment of the utility model, a valve seat structure of a special coal ash ball valve is provided. The ball valve includes a valve body, a ball and a valve seat. The valve seat is arranged between the valve body and the ball. A pre-tightening element is arranged between the valve seat and the valve body. The valve seat structure includes: a dust-proof mechanism and a sealing mechanism;

[0004] The valve seat is an L-shaped valve seat. The first end face of the L-shaped valve seat is connected to the valve body and is close to the L-shaped valve seat. The second end face of the L-shaped valve seat is close to the valve body;

[0005] The dust-proof mechanism is arranged on the joint surface between the L-shaped valve seat and the valve body, and the dust-proof mechanism prevents impurities from invading the pre-tightening element;

[0006] The sealing mechanism is arranged between the L-shaped valve seat and the valve body and is connected to the pre-tightening element, and the sealing mechanism seals the L-shaped valve seat and the valve body.

[0007] Further, the dust-proof mechanism includes: a pair of dust-proof rings. The dust-proof rings are arranged on the joint surface between the L-shaped valve seat and the valve body, and the pair of dust-proof rings are respectively located on both sides of the pre-tightening element.

[0008] Further, the pair of dust-proof rings are divided into a first dust-proof ring and a second dust-proof ring. The first dust-proof ring is arranged on the first end face, and the second dust-proof ring is arranged on the inner surface of the L-shaped valve seat. The inner surface of the L-shaped valve seat is parallel to the first end face.

[0009] Further, the sealing mechanism includes: a sealing ring and a pressing ring;

[0010] The sealing ring and the pressing ring are arranged between the valve body and the L-shaped valve seat;

[0011] Both ends of the sealing ring are respectively abutted against the pressure ring and the valve body;

[0012] The pressure ring is connected to the preloading element;

[0013] The preloading element drives the pressure ring to extrude the sealing ring, and the sealing ring expands radially for sealing.

[0014] Furthermore, the sealing ring is a V-shaped sealing ring, the pressure ring is a conical ring, and the conical ring is fitted with the V-shaped sealing ring.

[0015] Furthermore, the preloading element is a disc spring.

[0016] Furthermore, a gap is left between the second end face and the valve body, and the cross-section of the gap is trapezoidal.

[0017] According to the valve seat structure of the special coal ash ball valve according to the embodiment of the present invention, it can prevent impurities from invading the space of the preloading element, ensure the normal operation of the preloading element and the sealing structure, the sealing structure effectively prevents medium leakage, and the design of the gap prevents the medium from blocking and jamming the valve seat, jointly prolonging the service life of the valve seat and reducing the maintenance requirements.

[0018] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further explanation of the claimed technology. Brief Description of the Drawings

[0019] Figure 1 It is a cross-sectional schematic diagram of the valve seat structure of the special coal ash ball valve according to the embodiment of the present invention. Detailed Description of the Embodiments

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the drawings, and the present invention will be further elaborated.

[0021] First, in combination with Figure 1 Describe the valve seat structure of the special coal ash ball valve according to the embodiment of the present invention, which is used in the soot blowing system, slag discharging system, coal slurry and pulverized coal system, etc. in the coal chemical industry, and its application scenarios are very wide.

[0022] As Figure 1 shown, for the valve seat structure of the special coal ash ball valve according to the embodiment of the present invention, the ball valve includes a valve body 1, a ball 2 and a valve seat 3. The valve seat 3 is arranged between the valve body 1 and the ball 2, and a preloading element 6 is provided between the valve seat 3 and the valve body 1. The valve seat structure includes: a dust-proof mechanism and a sealing mechanism.

[0023] Specifically, as Figure 1As shown, in this embodiment, the valve seat 3 is an L-shaped valve seat 3. The first end face 31 of the L-shaped valve seat 3 is connected to the valve body 1 and is close to the L-shaped valve seat 3. The second end face 32 of the L-shaped valve seat 3 is close to the valve body 1. The dust-proof mechanism is arranged on the joint surface between the L-shaped valve seat 3 and the valve body 1, and the dust-proof mechanism prevents impurities from invading the pre-tightening element 6. The sealing mechanism is arranged between the L-shaped valve seat 3 and the valve body 1 and is connected to the pre-tightening element 6. The sealing mechanism seals the L-shaped valve seat 3 and the valve body 1. The pre-tightening element 6 is a disc spring, and the disc spring is used to provide a pre-tightening force. Through the dust-proof mechanism, coal ash, dust, impurities, etc. can be prevented from invading the space of the disc spring and the sealing mechanism, ensuring the normal operation of the disc spring and the sealing mechanism. The sealing mechanism seals the valve seat 3 and the valve body 1 to prevent the medium from leaking through the gap between the valve seat 3 and the valve body 1.

[0024] Furthermore, as Figure 1 shown, in this embodiment, the dust-proof mechanism includes: a pair of dust-proof rings. The dust-proof rings are arranged on the joint surface between the L-shaped valve seat 3 and the valve body 1. The pair of dust-proof rings are respectively located on both sides of the pre-tightening element 6. Specifically, the pair of dust-proof rings are divided into a first dust-proof ring 41 and a second dust-proof ring 42. The first dust-proof ring 41 is arranged on the first end face 31, and the second dust-proof ring 42 is arranged on the inner surface of the L-shaped valve seat 3. The inner surface of the L-shaped valve seat 3 is parallel to the first end face 31. Through the pair of dust-proof rings, comprehensive dust-proofing is achieved to protect the pre-tightening element 6.

[0025] Furthermore, as Figure 1 shown, in this embodiment, the sealing mechanism includes: a sealing ring 51 and a pressing ring 52; the sealing ring 51 and the pressing ring 52 are arranged between the valve body 1 and the L-shaped valve seat 3; both ends of the sealing ring 51 are respectively abutted against the pressing ring 52 and the valve body 1; the pressing ring 52 is connected to the pre-tightening element 6; the pre-tightening element 6 drives the pressing ring 52 to squeeze the sealing ring 51, and the sealing ring 51 expands radially to seal. The sealing ring 51 is a V-shaped sealing ring 51, and the pressing ring 52 is a conical ring. The conical ring is fitted with the V-shaped sealing ring 51. The contact surface between the conical ring and the V-shaped sealing ring 51 is not completely fitted and there is an angular difference to reduce wear and adapt to axial displacement. When the pre-tightening force of the disc spring acts on the conical ring, the conical ring pushes the V-shaped sealing ring 51 towards the valve body 1. At the same time, after the V-shaped sealing ring 51 expands, it fits with the valve body 1 and the L-shaped valve seat 3, thereby preventing the medium from leaking to achieve sealing.

[0026] Furthermore, as Figure 1 shown, in this embodiment, there is a gap t between the second end face 32 and the valve body 1. The cross-section of the gap t is trapezoidal. When the pressure pushes the L-shaped valve seat 3 towards the valve body 1, the apex angle on the L-shaped valve seat 3 can scrape all media, preventing the media from remaining at the gap t. At the same time, the trapezoidal cross-section is not easy for the media to remain. In this way, the L-shaped valve seat 3 can always displace with the pressure, so as to maintain good sealing of the ball seat for a long time and improve the valve life.

[0027] In the initial state, the pre-tightening force of the disc spring acts on the conical ring, and the conical ring pushes the V-shaped sealing ring 51 against the valve body 1. At the same time, after the V-shaped sealing ring 51 expands, it fits with the valve body 1 and the L-shaped valve seat 3, thereby preventing the leakage of the medium to achieve sealing. When the pressure pushes the L-shaped valve seat 3 towards the valve body 1, the apex angle on the L-shaped valve seat 3 can scrape all media, preventing the media from remaining at the gap t. At the same time, the trapezoidal gap t is not easy for the media to remain, so that the L-shaped valve seat 3 can always displace with the pressure, thereby maintaining good sealing of the ball seat for a long time and improving the service life of the valve.

[0028] As described above, with reference to Figure 1 the seat structure of the special coal ash ball valve according to the embodiment of the present utility model has been described, which can prevent impurities from invading the space of the pre-tightening element, ensure the normal operation of the pre-tightening element and the sealing structure, the sealing structure effectively prevents the leakage of the medium, and the design of the gap t prevents the medium from jamming the valve seat, jointly extending the service life of the valve seat and reducing the maintenance requirements.

[0029] It should be noted that in this specification, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "comprising..." do not exclude the existence of additional identical elements in the process, method, article or device including the elements.

[0030] Although the content of the present utility model has been introduced in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present utility model. After those skilled in the art have read the above content, various modifications and alternatives to the present utility model will be obvious. Therefore, the protection scope of the present utility model should be defined by the appended claims.

Claims

1. A special ball valve seat structure for coal ash, the ball valve comprising a valve body, a ball and a seat, the seat being arranged between the valve body and the ball, and a pre-tightening element being provided between the seat and the valve body, characterized in that, The valve seat structure includes: a dust-proof mechanism and a sealing mechanism; The valve seat is an L-shaped valve seat. The first end face of the L-shaped valve seat is connected to the valve body and is close to the L-shaped valve seat, and the second end face of the L-shaped valve seat is close to the valve body; The dust-proof mechanism is arranged on the joint surface between the L-shaped valve seat and the valve body, and the dust-proof mechanism prevents impurities from invading the pre-tightening element; The sealing mechanism is arranged between the L-shaped valve seat and the valve body and is connected to the pre-tightening element, and the sealing mechanism seals the L-shaped valve seat and the valve body.

2. The valve seat structure of the special coal ash ball valve according to claim 1, characterized in that The dust-proof mechanism includes: a pair of dust-proof rings. The dust-proof rings are arranged on the joint surface between the L-shaped valve seat and the valve body, and the pair of dust-proof rings are respectively located on both sides of the pre-tightening element.

3. The seat structure of the special coal ash ball valve according to claim 2, characterized in that, The pair of dust-proof rings are divided into a first dust-proof ring and a second dust-proof ring. The first dust-proof ring is arranged on the first end face, and the second dust-proof ring is arranged on the inner surface of the L-shaped valve seat. The inner surface of the L-shaped valve seat is parallel to the first end face.

4. The valve seat structure of the special coal ash ball valve according to claim 1, characterized in that The sealing mechanism includes: a sealing ring and a pressing ring; The sealing ring and the pressing ring are arranged between the valve body and the L-shaped valve seat; Both ends of the sealing ring are respectively abutted against the pressing ring and the valve body; The pressing ring is connected to the pre-tightening element; The pre-tightening element drives the pressing ring to squeeze the sealing ring, and the sealing ring expands radially for sealing.

5. The valve seat structure of the special coal ash ball valve according to claim 4, characterized in that, The sealing ring is a V-shaped sealing ring, and the pressing ring is a conical ring. The conical ring is fitted with the V-shaped sealing ring.

6. The valve seat structure of the special coal ash ball valve according to claim 1, characterized in that, The pre-tightening element is a disc spring.

7. The valve seat structure of the special coal ash ball valve according to claim 1, characterized in that, A gap is left between the second end face and the valve body, and the cross section of the gap is trapezoidal.

Images