Hydrophobic ball valve structure of supercritical unit

Abstract

The utility model relates to a supercritical unit drain ball valve structure which comprises a valve body, a valve rod and a valve ball, the valve body is integrally manufactured, a valve cavity is formed in the middle of the valve body, and flange holes are formed in the two ends of the valve body respectively. One side of the valve cavity is communicated with one flange hole, and the other side of the valve cavity is communicated with the other flange hole through a water through hole; a valve rod hole is formed in the middle of the upper end of the valve body, and fixing supports are arranged on the two sides of the upper end of the valve body respectively. The valve body is of an integrated die forging structure, the situation that a split valve is prone to leakage is avoided, the valve body is of a floating ball structure, and the ball body is easier to seal under high pressure; medium chromium carbide is sprayed on the ball body and the valve seat, so that the spraying hardness, the binding rate and the porosity are guaranteed, and the sealing reliability is guaranteed; a compensation disc spring is arranged between the valve seat and the positioning pressing ring, so that the valve seat ensures the mounting reliability and the sealing reliability; the thrust ring is arranged on the valve rod to limit the displacement of the valve rod and prevent the valve rod from being separated from the ball body, and safety and reliability are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of drain valves, in particular to a drain ball valve structure for a supercritical unit. Background Art

[0002] Supercritical units have become the main units in my country's current power plants. The parameters of the supercritical unit's steam trap ball valve are relatively high, and the on-site operating conditions are harsh. Not only is the temperature and pressure high, but the pressure difference before and after the valve is also large. Conventional high-pressure valves are prone to leakage and aging of seals. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the utility model provides a supercritical unit drain ball valve with good sealing performance and leakage prevention.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A supercritical unit drain ball valve structure, comprising:

[0006] The valve body is made of one piece, with a valve cavity in the middle of the valve body and flange holes at both ends of the valve body; one side of the valve cavity is connected to one flange hole, and the other side of the valve cavity is connected to another flange hole via a water hole; a valve stem hole is opened in the middle of the upper end of the valve body, and fixing brackets are provided on both sides of the upper end of the valve body;

[0007] A valve stem is inserted into the valve stem hole, and the lower end of the valve stem extends into the valve cavity; a sealing packing is provided between the lower section of the valve stem and the valve body, and a thrust ring is provided between the upper end of the valve stem and the fixed bracket;

[0008] The valve ball is screwed to the lower end of the valve stem, and valve seats are respectively provided on both sides of the valve ball. A limiting boss that can cooperate with the valve seat is provided on one side of the valve cavity, and a positioning pressure ring that can cooperate with the valve seat is provided on the other side of the valve cavity.

[0009] Preferably, a packing gland is provided at the upper end of the valve body, and a packing pressure ring is provided between the packing gland and the sealing packing.

[0010] Preferably, one side of the positioning pressure ring is fixed by a retaining spring, and a passage hole is provided in the positioning pressure ring.

[0011] Preferably, the outer surfaces of the valve body and the valve seat are respectively provided with chromium carbide coatings.

[0012] Preferably, a compensating disc spring is provided between the positioning pressure ring and the valve seat.

[0013] Preferably, the packing gland is connected to the valve body by a connecting piece.

[0014] Preferably, the fixing bracket is provided with a positioning groove capable of cooperating with the thrust ring; and the valve stem is provided with a positioning nut capable of cooperating with the thrust ring.

[0015] Preferably, a valve ball water through hole is provided in the valve ball, and valve seat water through holes corresponding to the valve ball water through hole are respectively provided on the valve seat.

[0016] Preferably, a pressure disc spring is provided between the packing gland and the packing pressure ring.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The valve body of the utility model adopts an integrated die-forged structure, which completely avoids the possibility of medium leakage from the valve and eliminates various safety hazards under high temperature and high pressure; the valve adopts a floating ball structure, and the ball is easier to seal under high pressure; the ball and the valve seat are sprayed with medium chromium carbide to ensure the hardness, bonding rate and porosity of the spraying, and to ensure sealing reliability; a compensating disc spring is provided between the valve seat and the positioning pressure ring to ensure installation reliability and sealing reliability of the valve seat; a thrust ring is provided on the valve stem to limit the displacement of the valve stem and avoid the valve stem and the ball from being disengaged, which is safe and reliable; the valve structure is simple and easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Fig. 1 It is a schematic diagram of the overall structure of the utility model.

[0020] Fig. 2 This is a schematic diagram of the valve body structure of the utility model.

[0021] In the figure: 1. Valve body; 2. Valve cavity; 3. Flange hole; 4. Water hole; 5. Valve stem hole; 6. Fixed bracket; 7. Valve stem; 8. Sealing packing; 9. Thrust ring; 10. Valve seat; 11. Limiting boss; 12. Positioning pressure ring; 13. Packing gland; 14. Packing pressure ring; 15. Retaining spring; 16. Passage hole; 17. Compensating disc spring; 18. Connecting piece; 19. Positioning slot; 20. Positioning nut; 21. Valve ball; 22. Valve ball water hole; 23. Valve seat water hole; 24. Pressure disc spring. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0023] This embodiment provides a supercritical unit drain ball valve structure, including a valve body 1, a valve stem 7 and a valve ball 21. The valve body 1 is provided with a valve stem 7, and the lower end of the valve stem 7 is provided with a valve ball 21.

[0024] like Figs. 1-2As shown, the valve body 1 is made in one piece, a valve cavity 2 is opened in the middle of the valve body 1, and flange holes 3 are opened at both ends of the valve body 1; the valve body 1 adopts an integral forging die structure, and the valve body 1 has no sealing parts (except the packing) communicating with the outside, completely blocking the possibility of leakage of the valve;

[0025] One side of the valve cavity 2 is connected to a flange hole 3, and the other side of the valve cavity 2 is connected to another flange hole 3 via a water hole 4. A valve stem hole 5 is opened in the middle of the upper end of the valve body 1, and fixing brackets 6 are respectively provided on both sides of the upper end of the valve body 1.

[0026] The valve stem 7 is inserted into the valve stem hole 5, and the lower end of the valve stem 7 extends into the valve cavity 2; a sealing packing 8 is provided between the lower section of the valve stem 7 and the valve body 1. Except for the sealing packing 8, the valve as a whole has no other sealing parts;

[0027] A thrust ring 9 is provided between the upper end of the valve stem 7 and the fixed bracket 6 to prevent the valve stem 7 from flying out under high pressure to avoid danger;

[0028] The valve ball 21 is screwed to the lower end of the valve stem 7, and the valve ball 21 is used to control the on and off of the valve; valve seats 10 are respectively provided on both sides of the valve ball 21, and a limiting boss 11 that can cooperate with the valve seat 10 is provided on one side of the valve cavity 2, and a positioning pressure ring 12 that can cooperate with the valve seat 10 is provided on the other side of the valve cavity 2. The positioning pressure ring 12 and the limiting boss 11 enable the two valve seats 10 to fix the axial position of the valve ball 21 to prevent the valve ball 21 from shaking left and right.

[0029] Furthermore, a packing gland 13 is provided at the upper end of the valve body 1 , and a packing pressing ring 14 is provided between the packing gland 13 and the sealing packing 8 . The packing gland 13 and the packing pressing ring 14 press the sealing packing 8 tightly between the valve stem 7 and the valve body 1 .

[0030] Furthermore, one side of the positioning pressing ring 12 is fixed by a retaining spring 15 , and a passage hole 16 is provided in the positioning pressing ring 12 , and the passage hole 16 is communicated with the water through hole 23 of the valve seat.

[0031] Furthermore, the outer surfaces of the valve body 1 and the valve seat 10 are respectively provided with chromium carbide coatings.

[0032] Furthermore, a compensating disc spring 17 is provided between the positioning pressing ring 12 and the valve seat 10 , and the compensating disc spring 17 ensures the installation reliability and sealing reliability of the valve seat.

[0033] Furthermore, the packing gland 13 is connected to the valve body 1 by a connecting piece 18 , and the connecting piece 18 is a bolt.

[0034] Further, the fixed support 6 is provided with a positioning clamping groove 19 capable of cooperating with the thrust ring 9; the valve rod 7 is provided with a positioning nut 20 capable of cooperating with the thrust ring 9.

[0035] Further, the valve ball 21 is provided with a valve ball water passing hole 22, the valve seat 10 is provided with a valve seat water passing hole 23 corresponding to the valve ball water passing hole 22 respectively, the valve rod 7 is capable of driving the valve ball 21 to rotate, when the valve ball water passing hole 22 is communicated with the two valve seat water passing holes 23, the valve is opened, and vice versa, the valve is closed.

[0036] Further, the packing gland 13 and the packing ring 14 are provided with a pressure disc spring 24, the pressure disc spring 24 is used for compensating the gap after the packing wears and burns at high temperature, and ensures the sealing reliability of the packing.

[0037] Working principle: in use, the valve ball 21 is fixed in the valve cavity 2 through the valve seat 10, the valve ball 21 is screwed on the lower end of the valve rod 7, when the valve rod 7 rotates, the valve ball 21 is driven to rotate, so as to realize the on-off function of the valve; the upper end of the valve rod 7 and the fixed support 6 are provided with the thrust ring 9, the thrust ring 9 prevents the valve rod 7 from flying out under high pressure, and avoids danger; the lower section of the valve rod 7 and the valve body 1 are provided with the sealing packing 8, the sealing packing 8 can avoid the medium from leaking between the valve body 1 and the valve rod 7; in addition to the sealing packing 8, the whole valve has no other sealing element; the positioning compression ring 12 and the valve seat 10 are provided with the compensation disc spring 17, the compensation disc spring 17 ensures the installation reliability and the sealing reliability of the valve seat 10.

[0038] It can be understood that the above implementation is only an exemplary embodiment for illustrating the principle of the utility model, and the utility model is not limited to this. For ordinary skilled persons in the art, various modifications and improvements can be made without departing from the spirit and essence of the utility model, and these modifications and improvements are also regarded as the protection scope of the utility model.

Claims

1. A supercritical unit drain ball valve structure, characterized by comprising: A valve body (1), wherein the valve body (1) is integrally formed, a valve cavity (2) is provided in the middle of the valve body (1), and flange holes (3) are provided at both ends of the valve body (1); one side of the valve cavity (2) is connected to one flange hole (3), and the other side of the valve cavity (2) is connected to the other flange hole (3) via a water hole (4); a valve stem hole (5) is provided in the middle of the upper end of the valve body (1), and fixing brackets (6) are provided on both sides of the upper end of the valve body (1); A valve stem (7), wherein the valve stem (7) is inserted into the valve stem hole (5), and the lower end of the valve stem (7) extends into the valve cavity (2); a sealing packing (8) is provided between the lower section of the valve stem (7) and the valve body (1), and a thrust ring (9) is provided between the upper end of the valve stem (7) and the fixed bracket (6); A valve ball (21) is screwed to the lower end of the valve stem (7), and valve seats (10) are respectively provided on both sides of the valve ball (21). A limiting boss (11) capable of cooperating with the valve seat (10) is provided on one side of the valve cavity (2), and a positioning pressure ring (12) capable of cooperating with the valve seat (10) is provided on the other side of the valve cavity (2).

2. A supercritical unit drain ball valve structure according to claim 1, characterized in that: A packing gland (13) is provided at the upper end of the valve body (1), and a packing pressure ring (14) is provided between the packing gland (13) and the sealing packing (8).

3. The supercritical unit drain ball valve structure according to claim 1 is characterized in that: One side of the positioning pressing ring (12) is fixed by a clamping spring (15), and a passage hole (16) is provided in the positioning pressing ring (12).

4. A supercritical unit drain ball valve structure according to claim 1, characterized in that: The outer surfaces of the valve body (1) and the valve seat (10) are respectively provided with chromium carbide coatings.

5. The supercritical unit drain ball valve structure according to claim 1 is characterized in that: A compensating disc spring (17) is provided between the positioning pressing ring (12) and the valve seat (10).

6. A supercritical unit drain ball valve structure according to claim 2, characterized in that: The packing gland (13) is connected to the valve body (1) via a connecting piece (18).

7. The supercritical unit drain ball valve structure according to claim 1 is characterized in that: The fixed bracket (6) is provided with a positioning groove (19) capable of cooperating with the thrust ring (9); and the valve stem (7) is provided with a positioning nut (20) capable of cooperating with the thrust ring (9).

8. The supercritical unit drain ball valve structure according to claim 1 is characterized in that: A valve ball water passage hole (22) is provided in the valve ball (21), and valve seat water passage holes (23) corresponding to the valve ball water passage holes (22) are respectively provided on the valve seat (10).

9. The supercritical unit drain ball valve structure according to claim 2, characterized in that: A pressure disc spring (24) is provided between the packing gland (13) and the packing pressure ring (14).

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