Grease injection structure of forged steel fixed ball valve

Abstract

The utility model relates to the technical field of ball valves, in particular to a grease injection structure of a forged steel fixed ball valve, which comprises a main valve body, a ball body and a valve seat component, a first grease injection channel is arranged in the main valve body, a second grease injection channel is arranged in the valve seat component, and the first grease injection channel is communicated with the second grease injection channel; the second grease injection channel comprises an infusion section and a sealing section, an opening of the infusion section faces the sealing face of the ball body, an opening of the sealing section is communicated with the containing cavity channel, sealing rubber is arranged in the sealing section, the sealing rubber can slide in the sealing section under the pressure effect of a medium, and baffle rings are further arranged at the two ends of the sealing section. The baffle ring is used for limiting the sealing rubber to only slide in the sealing section, and the first grease injection channel communicates with the infusion section. Compared with a traditional operation mode that sealing grease is supplemented after shutdown, continuity of pipeline production operation can be guaranteed, the interval time of grease injection maintenance is remarkably prolonged, and the working intensity of operators is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a grease injection structure of a forged steel fixed ball valve. Background Art

[0002] When a ball valve leaks, sealing by grease injection is a common emergency or auxiliary maintenance method, especially suitable for working conditions of high pressure, high temperature or corrosive media. The principle is to inject special sealing grease into the sealing area between the valve seat and the ball through a high-pressure grease injection gun, and use the grease to fill the tiny gaps or worn parts of the sealing surface to form a temporary or auxiliary sealing layer, thereby reducing or eliminating leakage.

[0003] However, under long-term operation, the sealing grease injected into the ball valve sealing surface will gradually be lost due to factors such as continuous flow erosion of the medium and chemical corrosion, resulting in a decrease in sealing performance and re-initiating leakage problems. The traditional solution requires manual replenishment of sealing grease with a high-pressure grease injection gun after shutdown, which affects production continuity and has a cumbersome operation process.

[0004] Therefore, how to achieve continuous replenishment of sealing grease on the sealing surface of the ball valve without stopping the machine is a technical problem that needs to be solved urgently in the prior art. Utility Model Content

[0005] The utility model aims to provide a grease injection structure for a forged steel fixed ball valve to solve the problem in the prior art of realizing continuous replenishment of sealing grease on the sealing surface of a ball valve without stopping the machine.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A grease injection structure of a forged steel fixed ball valve, comprising a main valve body, a ball and a valve seat component, wherein a through accommodating cavity is arranged inside the main valve body, the ball and the valve seat component are installed in the accommodating cavity, the valve seat component is arranged corresponding to the upstream side and the downstream side of the ball respectively, the valve seat component is used to fit the sealing surface of the ball so that the two form a sealing fit, the ball is also connected to a valve stem component, and the valve stem component is used to control the rotation of the ball,

[0008] A first grease injection channel is also provided inside the main valve body, and a second grease injection channel is provided inside the valve seat component, and the first grease injection channel is communicated with the second grease injection channel; the second grease injection channel includes an infusion section and a sealing section, the opening of the infusion section faces the sealing surface of the sphere, the opening of the sealing section is communicated with the accommodating cavity, a sealing rubber is provided inside the sealing section, and the sealing rubber can slide inside the sealing section under the pressure of the medium, and retaining rings are also provided at both ends of the sealing section, and the retaining rings are used to limit the sealing rubber to slide only inside the sealing section, and the first grease injection channel is communicated with the infusion section.

[0009] Preferably, the inner diameter of the infusion section is smaller than the inner diameter of the sealing section.

[0010] Preferably, the central axis of the second grease injection channel is arranged parallel to the central axis of the accommodating cavity.

[0011] Preferably, a region of the accommodating cavity corresponding to the opening of the sealing section is configured as a bevel structure, and the bevel structure is used to increase the area of ​​the opening of the sealing section exposed in the accommodating cavity.

[0012] Preferably, the infusion section includes a main channel section and a receiving channel section, the receiving channel section is arranged between the sealing section and the main channel section, the inner diameter of the receiving channel section matches the inner diameter of the sealing section, and the first grease injection channel is connected to the receiving channel section.

[0013] Preferably, the retaining ring is provided with a through hole, and the through hole is used for the sealing grease to pass through.

[0014] Preferably, the end opening of the infusion section is configured as a trumpet-mouth structure.

[0015] Preferably, the inner wall of the bell-mouth structure at the end of the infusion section is a rough surface structure.

[0016] Preferably, a check valve is provided at the end of the first grease injection channel, and the check valve is used to prevent the sealing grease from overflowing.

[0017] Preferably, the valve seat component can slide along the central axis of the accommodating cavity; a spring is arranged between the main valve body and the valve seat component, and the spring is used to apply a thrust force toward the ball to the valve seat component.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0019] 1. The grease injection structure of a forged steel fixed ball valve described in the utility model is arranged such that the opening of the sealing section is connected to the accommodating cavity. Under the action of the medium pressure, the sealing rubber in the sealing section can slowly slide toward one side of the injection section. During this process, the sealing grease in the second grease injection channel can be continuously pushed and injected to the sealing surface of the ball body, thereby realizing the dynamic replenishment of the sealing grease on the sealing surface of the ball valve, thereby reducing the risk of leakage during the operation of the ball valve; and, compared with the traditional operation mode of replenishing the sealing grease after shutdown, the adoption of this structural setting can ensure the continuity of the production and operation of the pipeline, and also significantly prolong the interval time of grease injection maintenance, thereby reducing the workload of the operators;

[0020] 2. The utility model describes a grease injection structure for a forged steel fixed ball valve, wherein the infusion section includes a main channel section and a receiving channel section, wherein the receiving channel section is arranged between the sealing section and the main channel section, wherein the inner diameter of the receiving channel section matches the inner diameter of the sealing section, and the first grease injection channel is connected to the receiving channel section. With this structural arrangement, on the one hand, the receiving channel section can guide the sealing grease injected by the first grease injection channel, so that it can enter the sealing section more steadily and smoothly; on the other hand, in the initial section where the pressure of the sealing grease is used to push the sealing rubber to move away from the infusion section, the force pushing the sealing rubber is derived from the pressure of the sealing grease in the receiving channel section, which increases the pressure area applied to the sealing rubber, thereby further improving the smoothness of the movement of the sealing rubber;

[0021] 3. In the grease injection structure of a forged steel fixed ball valve described in the utility model, the end opening of the infusion section is set as a bell-mouth structure. With this structural setting, the sealing grease can be more fully accumulated on the sealing surface of the ball, thereby improving the sealing effect. Furthermore, the inner wall of the bell-mouth structure at the end of the infusion section is a rough surface structure. With this structural setting, the adhesion between the sealing grease and the inner wall of the bell-mouth at the end of the infusion section can be increased, making it more difficult for the sealing grease to be washed away by the flow of the medium, further improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic cross-sectional structure diagram of a grease injection structure of a forged steel trunnion mounted ball valve;

[0023] Figure 2 yes Figure 1 Schematic diagram of the structure of A.

[0024] Markings in the figure: 1-main valve body, 2-ball, 3-valve seat component, 4-accommodating cavity, 5-valve stem component, 6-first grease injection channel, 7-second grease injection channel, 8-blocking ring, 9-infusion section, 10-sealing section, 11-sealing rubber, 12-main channel section, 13-receiving channel section, 14-spring, 15-check valve. DETAILED DESCRIPTION

[0025] The utility model is described in detail below in conjunction with the accompanying drawings.

[0026] To make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments.

[0027] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the present invention to be protected, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "upper", "lower", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] Example 1: Figure 1 and Figure 2As shown in the figure, a grease injection structure of a forged steel fixed ball valve according to the present utility model includes a main valve body 1, a ball 2 and a valve seat component 3. A through accommodation cavity 4 is provided inside the main valve body 1. The ball 2 and the valve seat component 3 are installed in the accommodation cavity 4. The valve seat component 3 is respectively arranged corresponding to the upstream side and the downstream side of the ball 2. The valve seat component 3 is used to fit the sealing surface of the ball 2 so that the two form a sealing fit. A valve stem component 5 is also connected to the ball 2. The valve stem component 5 is used to control the rotation of the ball 2.

[0032] A first grease injection channel 6 is further provided inside the main valve body 1. A second grease injection channel 7 is provided inside the valve seat component 3. The first grease injection channel 6 is communicated with the second grease injection channel 7. The second grease injection channel 7 includes an infusion section 9 and a sealing section 10. The opening of the infusion section 9 faces the sealing surface of the ball 2. The opening of the sealing section 10 is communicated with the accommodation cavity 4. A sealing rubber 11 is arranged inside the sealing section 10. Under the pressure of the medium, the sealing rubber 11 can slide inside the sealing section 10. Retaining rings 8 are further arranged at both ends of the sealing section 10. The retaining rings 8 are used to limit the sealing rubber 11 to only slide inside the sealing section 10. The first grease injection channel 6 is communicated with the infusion section 9.

[0033] By adopting the grease injection structure of a forged steel fixed ball valve according to the present utility model, the opening of the sealing section 10 is communicated with the accommodation cavity 4. Under the action of the medium pressure, the sealing rubber 11 inside the sealing section 10 can slowly slide towards the side of the infusion section 9. During this process, the sealing grease inside the second grease injection channel 7 can be continuously injected to the sealing surface of the ball 2. In this way, the dynamic replenishment of the sealing grease on the sealing surface of the ball valve is realized, thereby reducing the risk of leakage during the operation of the ball valve. Moreover, by adopting this structural arrangement, compared with the traditional operation method of replenishing the sealing grease after shutdown, the continuity of pipeline production operation can be ensured, the interval time of grease injection maintenance is significantly extended, and the working intensity of the operator is reduced.

[0034] Specifically, in this embodiment, when no sealing grease is injected into the second grease injection channel 7, the sealing rubber 11 will be pushed towards the side of the infusion section 9 under the action of the medium pressure and will be in close contact with the retaining ring 8. During the operation of injecting the sealing grease, the infusion section 9 is first filled with the sealing grease. At this time, due to the blockage of the ball 2, the resistance of the sealing grease flowing towards the side of the infusion section 9 is greater than the resistance of flowing towards the side of the sealing section 10. The sealing grease gradually fills the sealing section 10 and pushes the sealing rubber 11 to slide in the direction away from the infusion section 9 until the sealing rubber 11 abuts against the retaining ring 8, completing the injection operation of the sealing grease.

[0035] As a preferred embodiment, on the basis of the above-mentioned manner, further, the inner diameter of the infusion section 9 is smaller than the inner diameter of the sealing section 10. With this structural setting, after the sealing grease fills the infusion section 9, it needs to overcome greater resistance when continuing to flow to the side of the infusion section 9, so that the sealing grease can be more effectively guided to flow to the sealing section 10. In this way, the sealing rubber 11 can be pushed more smoothly and slide in the direction away from the infusion section 9, which significantly improves the practicality of the utility model in actual application.

[0036] As a preferred embodiment, on the basis of the above-mentioned manner, further, the central axis of the second grease injection channel 7 is arranged parallel to the central axis of the accommodating cavity 4. With this structural arrangement, the pressure of the flowing medium in the accommodating cavity 4 can act vertically on the sealing rubber 11, so that the sealing rubber 11 can slide more steadily and smoothly in the sealing section 10, thereby improving the uniformity and stability of the sealing grease being pushed into the sealing surface of the ball 2. In addition, with this structural arrangement, it is also possible to effectively suppress the formation of a turbulent flow state when the medium flows through the opening of the sealing section 10, thereby improving the stability of the ball valve operation and extending its service life.

[0037] As a preferred embodiment, based on the above manner, further, the area of ​​the accommodating cavity 4 corresponding to the opening of the sealing section 10 is set as a bevel structure, and the bevel structure is used to increase the area of ​​the opening of the sealing section 10 exposed in the accommodating cavity 4. With this structural setting, when the medium flows through the opening of the sealing section 10, it can more effectively and directly impact the sealing rubber 11, so that the sealing rubber 11 can slide more smoothly in the sealing section 10.

[0038] As a preferred embodiment, on the basis of the above method, further, the infusion section 9 includes a main channel section 12 and a receiving channel section 13, the receiving channel section 13 is arranged between the sealing section 10 and the main channel section 12, the inner diameter of the receiving channel section 13 matches the inner diameter of the sealing section 10, and the first grease injection channel 6 is connected to the receiving channel section 13.

[0039] With this structural arrangement, on the one hand, the receiving channel section 13 can guide the sealing grease injected by the first grease injection channel 6, so that it can enter the sealing section 10 more steadily and smoothly; on the other hand, in the initial section where the pressure of the sealing grease is used to push the sealing rubber 11 to move away from the infusion section 9, the force pushing the sealing rubber 11 is derived from the pressure of the sealing grease in the receiving channel section 13. In this way, the pressure area applied to the sealing rubber 11 is increased, thereby further improving the smoothness of the movement of the sealing rubber 11.

[0040] As a preferred embodiment, on the basis of the above method, further, through holes are provided on the retaining ring 8, and the through holes are used for the sealing grease to pass through. With this structural arrangement, the smoothness of the flow of the sealing grease in the sealing section 10 can be improved.

[0041] Example 2: As Figure 1 and Figure 2 shown, for the grease injection structure of a forged steel fixed ball valve described in the present invention, on the basis of the above method, further, the end opening of the infusion section 9 is arranged in a flared structure. With this structural arrangement, the sealing grease can be more fully accumulated on the sealing surface of the ball 2, thereby improving the sealing effect.

[0042] As a preferred embodiment, on the basis of the above method, further, the inner wall of the flared structure at the end of the infusion section 9 is a rough surface structure. With this structural arrangement, the adhesion between the sealing grease and the inner wall of the flared end of the infusion section 9 can be increased, making it more difficult for the sealing grease to be washed away by the flow of the medium, and further improving the sealing effect.

[0043] As a preferred embodiment, on the basis of the above method, further, a check valve 15 is provided at the end of the first grease injection channel 6, and the check valve 15 is used to prevent the sealing grease from overflowing. With this structural arrangement, the practicality of the present invention in actual use is further improved.

[0044] Example 3: As Figure 2 shown, for the grease injection structure of a forged steel fixed ball valve described in the present invention, as a preferred embodiment, on the basis of the above method, further, the valve seat component 3 can slide along the central axis of the accommodation channel 4; a spring 14 is provided between the main valve body 1 and the valve seat component 3, and the spring 14 is used to apply a top thrust force to the valve seat component 3 in the direction towards the ball 2.

[0045] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grease injection structure for a forged steel fixed ball valve, characterized in that: It includes a main valve body, a ball and a valve seat component. The main valve body is provided with a through accommodating cavity. The ball and the valve seat component are installed in the accommodating cavity. The valve seat component is respectively provided corresponding to the upstream side and the downstream side of the ball. The valve seat component is used to fit the sealing surface of the ball so that the two form a sealing fit. The ball is also connected to a valve stem component, and the valve stem component is used to control the rotation of the ball. A first grease injection channel is also provided inside the main valve body, and a second grease injection channel is provided inside the valve seat component, and the first grease injection channel is communicated with the second grease injection channel; the second grease injection channel includes an infusion section and a sealing section, the opening of the infusion section faces the sealing surface of the sphere, the opening of the sealing section is communicated with the accommodating cavity, a sealing rubber is provided inside the sealing section, and the sealing rubber can slide inside the sealing section under the pressure of the medium, and retaining rings are also provided at both ends of the sealing section, and the retaining rings are used to limit the sealing rubber to slide only inside the sealing section, and the first grease injection channel is communicated with the infusion section.

2. The grease injection structure of the forged steel trunnion mounted ball valve according to claim 1, characterized in that: The inner diameter of the infusion section is smaller than the inner diameter of the sealing section.

3. The grease injection structure of the forged steel trunnion mounted ball valve according to claim 2, characterized in that: The central axis of the second grease injection channel is arranged parallel to the central axis of the accommodating cavity.

4. The grease injection structure of the forged steel trunnion mounted ball valve according to claim 3, characterized in that: The area of ​​the accommodating cavity corresponding to the opening of the sealing section is configured as a bevel structure, and the bevel structure is used to increase the area of ​​the opening of the sealing section exposed in the accommodating cavity.

5. The grease injection structure of the forged steel trunnion mounted ball valve according to claim 4, characterized in that: The infusion section includes a main channel section and a receiving channel section, the receiving channel section is arranged between the sealing section and the main channel section, the inner diameter of the receiving channel section matches the inner diameter of the sealing section, and the first grease injection channel is connected to the receiving channel section.

6. The grease injection structure of the forged steel trunnion mounted ball valve according to any one of claims 1 to 5, characterized in that: The retaining ring is provided with a through hole, and the through hole is used for the sealing grease to pass through.

7. The grease injection structure of the forged steel trunnion mounted ball valve according to claim 6, characterized in that: The end opening of the infusion section is configured as a trumpet structure.

8. The grease injection structure of the forged steel trunnion mounted ball valve according to claim 7, characterized in that: The inner wall of the bell-mouth structure at the end of the infusion section is a rough surface structure.

9. The grease injection structure of the forged steel trunnion mounted ball valve according to claim 8, characterized in that: A check valve is provided at the end of the first grease injection channel, and the check valve is used to prevent the sealing grease from overflowing.

10. The grease injection structure of the forged steel trunnion mounted ball valve according to claim 1, characterized in that: The valve seat component can slide along the central axis of the accommodating cavity; a spring is arranged between the main valve body and the valve seat component, and the spring is used to apply a thrust force toward the ball to the valve seat component.

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