Regulating valve sealing structure

Abstract

The utility model relates to a regulating valve sealing structure which comprises a valve body, a valve core, a balance cylinder and a metal ring, a valve cavity is arranged in the valve body, a valve cover is arranged at the upper end of the valve body, a valve rod is arranged in the valve cover, and the lower end of the valve rod extends into the valve cavity; a valve seat is arranged at the lower end of the valve body; the valve element is installed at the lower end of the valve rod through threaded connection, a gland is arranged at the upper end of the valve element, and a balance sealing ring is arranged between the valve element and the pressing rod. The balance cylinder is installed between the valve deck and the valve seat through a sleeve. A first through hole capable of being matched with the valve element is formed in the balance cylinder. A second through hole corresponding to the through hole is formed in the sleeve; and the metal rings are respectively sleeved on the gland and the upper section of the valve core. By changing the position of the balance sealing ring and matching with the particle scraping effect of the metal ring, the balance sealing ring can be prevented from being damaged by particles in a medium in the assembling and using processes, the sealing effect is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of regulating valves and relates to a sealing structure of a regulating valve. Background Art

[0002] The balancing seal ring is an important component in the regulating valve. It is usually installed between the sleeve and the balance rod. It has high requirements for the purity of the applied medium. However, due to the complex on-site working conditions, there are often impurities such as tiny particles in the medium, which causes impurities to exist between the valve core and the sleeve. The up and down movement of the valve core will cause the impurities to rub against the balancing seal ring, causing the balancing seal ring to increase wear or even damage, thereby reducing the valve leakage level and affecting the service life and performance of the valve. In addition, during installation, the balancing seal ring is in the middle position and cannot be seen when the valve core is installed downward, which may cause the balancing seal ring to be damaged during installation. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the utility model provides a regulating valve sealing structure.

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

[0005] A regulating valve sealing structure, comprising:

[0006] A valve body is provided with a valve cavity, a valve cover is provided at the upper end of the valve body, a valve stem is provided in the valve cover, and the lower end of the valve stem extends into the valve cavity; a valve seat is provided at the lower end of the valve body;

[0007] The valve core is installed on the lower end of the valve stem by threaded connection, a pressure cover is provided on the upper end of the valve core, and a balancing sealing ring is provided between the valve core and the pressure rod;

[0008] The balancing cylinder is installed between the valve cover and the valve seat by means of a sleeve; a first through hole is provided inside the balancing cylinder to match the valve core; a second through hole is provided in the sleeve to correspond to the through hole;

[0009] The metal rings are respectively fitted on the gland and the upper section of the valve core.

[0010] Preferably, a sealing boss is provided under the valve cover, and the upper ends of the valve body and the balancing cylinder are respectively provided with a first groove and a second groove that can cooperate with the sealing boss; a first sealing ring and a second sealing ring are respectively provided between the sealing boss and the first groove and the second groove.

[0011] Preferably, a mounting boss is provided on the outer side of the lower end of the gland, a mounting groove capable of cooperating with the mounting boss is provided on the upper end of the valve core, and the balancing sealing ring is press-fitted between the press-fitting boss and the mounting groove.

[0012] Preferably, a third sealing ring is provided between the valve seat and the valve body.

[0013] Preferably, the gland is connected to the valve core via a connector.

[0014] Preferably, a positioning washer is provided between the balancing cylinder and the sleeve, a positioning boss is provided at the upper end of the positioning washer, and a positioning slot capable of cooperating with the positioning boss is provided at the lower end of the balancing cylinder.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The utility model changes the position of the balancing sealing ring and cooperates with the metal ring to scrape off particles, so that the balancing sealing ring can avoid being damaged by particles in the medium during assembly and use, thereby improving the sealing effect and extending the service life; the utility model has a simple structure, and the metal ring can scrape off impurities on the inner wall of the balancing rod during the up and down movement of the valve core, and can also protect the flatness of the inner hole of the balancing cylinder; the overall structure is simple, and the visibility of the assembly process is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 This is a structural diagram of the balancing cylinder of the present utility model.

[0019] Figure 3 for Figure 1 A in the enlarged view.

[0020] Figure 4 for Figure 1 Enlarged view of point B in .

[0021] Figure 5 This is a schematic diagram of the sleeve structure of the present utility model.

[0022] In the figure: 1. valve body; 2. valve chamber; 3. valve cover; 4. valve stem; 5. valve seat; 6. pressure cover; 7. balancing sealing ring; 8. balancing cylinder; 9. sleeve; 10. first through hole; 11. second through hole; 12. metal ring; 13. sealing boss; 14. first groove; 15. second groove; 16. first sealing ring; 17. second sealing ring; 18. mounting boss; 19. mounting groove; 20. third sealing ring; 21. connecting piece; 22. positioning washer; 23. positioning boss; 24. valve core; 25. positioning slot. DETAILED DESCRIPTION

[0023] 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.

[0024] This embodiment provides a regulating valve sealing structure, comprising: a valve body 1, a valve core 24, a balancing cylinder 8, and a metal ring 12. The balancing cylinder 8 is provided in the valve body 1 and can cooperate with the valve core 24.

[0025] like Figure 1-Figure 5 As shown, a valve cavity 2 is defined in the valve body 1, and the valve cavity 2 provides installation space for components in the valve; a valve cover 3 is provided at the upper end of the valve body 1, a valve stem 4 is provided in the valve cover 3, and the lower end of the valve stem 4 extends into the valve cavity 2; a valve seat 5 is provided at the lower end of the valve body 1;

[0026] The valve core 24 is installed on the lower end of the valve stem 4 by means of a threaded connection. A gland 6 is provided on the upper end of the valve core 24. A balancing sealing ring 7 is provided between the valve core 24 and the stem.

[0027] The balancing cylinder 8 is installed between the valve cover 3 and the valve seat 5 using the sleeve 9. The balancing cylinder 8 has a first through hole 10 that can cooperate with the valve core 24. The sleeve 9 has a second through hole 11 corresponding to the through hole. The valve core 24 can move up and down in the first through hole 10 and the second through hole 11. The balancing sealing ring 7 ensures the sealing of the valve core 24.

[0028] The metal rings 12 are respectively mounted on the upper sections of the gland 6 and the valve core 24. The two metal rings 12 are located above and below the balancing seal ring 7. During the movement of the valve core 24, the metal rings 12 can scrape off the particulate impurities on the inner wall of the balancing cylinder 8 to protect the balancing seal ring 7 from damage.

[0029] Furthermore, a sealing boss 13 is provided under the valve cover 3, and the upper ends of the valve body 1 and the balancing cylinder 8 are respectively provided with a first groove 14 and a second groove 15 that can cooperate with the sealing boss 13; a first sealing ring 16 and a second sealing ring 17 are respectively provided between the sealing boss 13 and the first groove 14 and the second groove 15, and the first sealing ring 16 and the second sealing ring 17 prevent leakage between the valve cover 3 and the valve body 1 of the balancing cylinder 8.

[0030] Furthermore, a mounting boss 18 is provided on the outer side of the lower end of the pressure cover 6, and a mounting groove 19 that can cooperate with the mounting boss 18 is provided on the upper end of the valve core 24, and the balancing sealing ring 7 is pressed between the pressing boss and the mounting groove 19; the balancing sealing ring 7 is installed between the valve core 24 and the pressure cover 6, rather than being installed on the inner wall of the balancing cylinder 8, so the balancing sealing ring 7 will not be damaged during assembly.

[0031] Furthermore, a third sealing ring 20 is provided between the valve seat 5 and the valve body 1 , and the third sealing ring 20 prevents leakage between the valve seat 5 and the valve body 1 .

[0032] Furthermore, the gland 6 is connected to the valve core 24 by a connecting piece 21 , and the connecting piece 21 is a connecting bolt for easy assembly.

[0033] Furthermore, a positioning washer 22 is provided between the balancing cylinder 8 and the sleeve 9, a positioning boss 23 is provided at the upper end of the positioning washer 22, and a positioning slot 25 that can cooperate with the positioning boss 23 is provided at the lower end of the balancing cylinder 8; the positioning slot 25 and the positioning boss 23 facilitate assembly and fixation between the balancing cylinder 8 and the positioning washer 22.

[0034] Working principle: The utility model installs the balancing sealing ring 7 between the pressure cover 6 and the valve core 24, rather than on the inner wall of the balancing cylinder 8, thereby avoiding the possibility of damaging the balancing sealing ring 7 when the valve core 24 and the balancing cylinder 8 are assembled; and metal rings 12 are respectively installed on the valve core 24 and the pressure cover 6 on the upper and lower sides of the balancing sealing ring 7. During the movement of the valve core, the metal ring 12 can scrape off the particles on the inner wall of the balancing cylinder, thereby avoiding the possibility of particles in the medium damaging the metal sealing ring 7 and improving the service life of the valve.

[0035] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A regulating valve sealing structure, characterized by comprising: A valve body (1), wherein a valve cavity (2) is formed in the valve body (1), a valve cover (3) is provided at the upper end of the valve body (1), a valve stem (4) is provided in the valve cover (3), and the lower end of the valve stem (4) extends into the valve cavity (2); a valve seat (5) is provided at the lower end of the valve body (1); A valve core (24), the valve core (24) is mounted on the lower end of the valve stem (4) by means of a threaded connection, a gland (6) is provided at the upper end of the valve core (24), and a balancing sealing ring (7) is provided between the valve core (24) and the gland (6); A balancing cylinder (8) is installed between the valve cover (3) and the valve seat (5) by means of a sleeve (9); a first through hole (10) capable of cooperating with the valve core (24) is provided inside the balancing cylinder (8); and a second through hole (11) corresponding to the through hole is provided inside the sleeve (9); The metal ring (12) is respectively mounted on the gland (6) and the upper portion of the valve core (24).

2. A regulating valve sealing structure according to claim 1, characterized in that: A sealing boss (13) is provided below the valve cover (3); a first groove (14) and a second groove (15) are provided at the upper ends of the valve body (1) and the balancing cylinder (8), respectively, and are capable of cooperating with the sealing boss (13); a first sealing ring (16) and a second sealing ring (17) are provided between the sealing boss (13) and the first groove (14) and the second groove (15), respectively.

3. The regulating valve sealing structure according to claim 1, wherein: A mounting boss (18) is provided on the outer side of the lower end of the pressure cover (6), a mounting groove (19) capable of matching with the mounting boss (18) is provided on the upper end of the valve core (24), and the balancing seal ring (7) is press-fitted between the press-fitting boss and the mounting groove (19).

4. The regulating valve sealing structure according to claim 1, wherein: A third sealing ring (20) is provided between the valve seat (5) and the valve body (1).

5. The regulating valve sealing structure according to claim 1, wherein: The gland (6) is connected to the valve core (24) via a connecting piece (21).

6. The regulating valve sealing structure according to claim 1, characterized in that: A positioning washer (22) is provided between the balancing cylinder (8) and the sleeve (9), a positioning boss (23) is provided at the upper end of the positioning washer (22), and a positioning slot (25) capable of cooperating with the positioning boss (23) is provided at the lower end of the balancing cylinder (8).

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