Throttling device with self-sealing function for pumped storage power station servomotor

Abstract

The utility model discloses a throttling device with a self-sealing function for a pumped storage power station servomotor, which comprises a throttling valve body, a corner flow channel and a valve needle mounting hole channel are arranged in the throttling valve body, a regulating valve needle which is in throttling fit with the corner flow channel is mounted in the valve needle mounting hole channel, and the regulating valve needle is connected with the corner flow channel. A sealing assembly is arranged at the position, close to the throttling point at the front end, of the adjusting valve needle. The sealing assembly comprises a sealing installation column, an inner groove is formed in the sealing installation column, a sliding sealing ring is arranged in the inner groove, the sliding sealing ring is tightly attached to the inner wall of the valve needle installation hole channel, and an elastic sealing ring is further arranged between the sliding sealing ring and the inner groove. The throttling device can be automatically suitable for different working pressures, it is ensured that the throttling device can keep good sealing performance under various working conditions, and the liquid leakage phenomenon is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of throttle devices for servomotors, in particular to a throttle device for a pumped-storage power station servomotor with a self-sealing function, which is mainly used for regulating the flow rate and ensuring the sealing performance during the operation of the servomotor. Background Technique

[0002] In a pumped-storage power station, the throttle device is a key equipment of the servomotor water turbine unit. The traditional throttle device usually does not have a self-sealing function (see the attached Figure 4 ) without a self-sealing component. Therefore, when regulating the flow rate, there will be external leakage or even pressure-bearing operation, and such a structure makes on-site regulation not very convenient. Therefore, improvement is needed to improve the sealing performance and operability.

[0003] At the same time, the thrust collar of the existing throttle device is directly locked on the outer surface of the valve body (see the attached Figure 4 ) without a counterbore installation structure, with slightly poor stability and a relatively large exposed height, which to a certain extent affects the assembly of the entire valve body. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is: in order to overcome the deficiencies in the prior art, an improved throttle device for a pumped-storage power station servomotor with a self-sealing function is provided.

[0005] The technical solution adopted by the utility model to solve its technical problem is: a throttle device for a pumped-storage power station servomotor with a self-sealing function, including a throttle valve body, a corner flow channel and a valve needle installation channel are arranged in the throttle valve body, a regulating valve needle that realizes throttling cooperation with the corner flow channel is installed in the valve needle installation channel, and a sealing component is arranged on the regulating valve needle near the front throttle point;

[0006] The sealing component includes a sealing installation column, an inner groove is opened on the sealing installation column, a sliding sealing ring is arranged in the inner groove, the sliding sealing ring is close to the inner wall of the valve needle installation channel, and an elastic sealing ring is also arranged between the sliding sealing ring and the inner groove;

[0007] By adopting the above technical solution, the elastic sealing ring and the sliding sealing ring can automatically adapt to different working pressures, ensure that the throttle device can maintain good sealing performance under various working conditions, and reduce the liquid leakage phenomenon.

[0008] The end of the sliding sealing ring in contact with the inner wall of the valve needle installation channel is set as a double-bevel convex structure, and the sliding sealing ring is made of PTFE (polytetrafluoroethylene) material with a low friction coefficient, which is beneficial to better realize sliding sealing;

[0009] Further, the sliding seal ring of the present utility model is connected to the elastic sealing ring through a radial interference fit, ensuring that the elastic sealing ring can also make the sliding seal ring closely adhere to the inner wall of the channel by its own elastic force under a low-pressure environment.

[0010] Further, a thrust sleeve is provided at the rear end of the regulating valve needle of the present utility model, and the thrust sleeve is connected by a thread in the sunken mounting hole at the rear end of the valve needle mounting hole;

[0011] By adopting the above technical solution, the thrust sleeve and the throttle valve body are connected by a thread, which reduces the difficulty of processing and manufacturing, and at the same time reduces the requirement for the concentricity between the regulating valve needle and the throttle valve body. Moreover, the fit of the sunken mounting hole reduces the exposed height of the thrust sleeve and also makes the connection more stable.

[0012] Further, the thrust sleeve and the regulating valve needle of the present utility model are also locked by a locking nut.

[0013] The beneficial effects of the present utility model are as follows: By adding a sealing component including a sliding seal ring and a sealing ring on the regulating valve needle, and through the cooperation between the two and its structural characteristics, the device maintains a good sealing function during the process of buffering the flow rate, and can maintain the sealing effect both in the high-pressure and low-pressure states. At the same time, the sunken threaded mounting structure of the thrust sleeve makes the installation of the valve needle more stable and reduces the exposed height of the thrust sleeve, which is very practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 is a structural schematic diagram of the present utility model;

[0016] Figure 2 is a structural schematic diagram of the sealing component in the present utility model;

[0017] Figure 3 is a structural schematic diagram showing the sliding seal ring cooperating with the elastic sealing ring under the hydraulic state in the present utility model;

[0018] Figure 4 is a structural schematic diagram of a throttling device in the prior art.

[0019] Reference numerals in the figure: 1. Throttle valve body, 2. Corner flow channel, 3. Valve needle installation hole channel, 4. Regulating valve needle, 5. Sealing installation column, 6. Sliding sealing ring, 7. Elastic sealing ring, 8. Double-bevel convex structure, 9. Thrust sleeve, 10. Sinking installation hole, 11. Locking nut. Detailed implementation mode

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] As Figures 1 to 3 shown, a throttling device for a pumped storage power station servomotor with a self-sealing function includes a throttle valve body 1. A corner flow channel 2 and a valve needle installation hole channel 3 are provided inside the throttle valve body 1. A regulating valve needle 4 that is in throttling cooperation with the corner flow channel 2 is installed in the valve needle installation hole channel 3. A sealing assembly is provided on the regulating valve needle 4 near the front throttle point.

[0022] The sealing assembly includes a sealing installation column 5. An inner groove is provided on the sealing installation column 5. A sliding sealing ring 6 is provided in the inner groove. The sliding sealing ring 6 is in close contact with the inner wall of the valve needle installation hole channel 3. An elastic sealing ring 7 is also provided between the sliding sealing ring 6 and the inner groove.

[0023] The end of the sliding sealing ring 6 in contact with the inner wall of the valve needle installation hole channel 3 is provided with a double-bevel convex structure 8.

[0024] Among them, the sliding sealing ring 6 and the elastic sealing ring 7 are connected by radial interference fit to ensure that the elastic sealing ring can also make the sliding sealing ring closely adhere to the inner wall of the channel through its own elastic force in a low-pressure environment.

[0025] A thrust sleeve 9 is provided at the rear end of the regulating valve needle 4. The thrust sleeve 9 is threadedly connected in a sinking installation hole 10 at the rear end of the valve needle installation hole channel 3. The thrust sleeve 9 and the regulating valve needle 4 are also locked by a locking nut 11.

[0026] Working principle: The sliding sealing ring and the elastic sealing ring cooperate to form a new sealing assembly. When the liquid flows unidirectionally into the inner groove of the sealing installation column, one side of the sliding sealing ring and the elastic sealing ring is subjected to hydraulic pressure, forcing the elastic sealing ring to undergo elastic deformation and giving the sliding sealing ring a force to push outwards. Finally, the sliding sealing ring and the inner wall of the installation channel are more closely adhered to achieve a self-sealing effect.

[0027] Meanwhile, in a low-pressure environment, since the sliding seal ring and the elastic sealing ring are connected by a radial interference fit, the sliding seal ring can also be closely attached to the inner wall of the channel by its own elastic force.

[0028] The throttling device of the utility model can automatically adapt to different working pressures, ensuring that the throttling device can maintain good sealing performance under various working conditions and reducing the phenomenon of liquid leakage.

Claims

1. A throttling device for a pumped storage power station relay with a self-sealing function, characterized in that: The invention comprises a throttle valve body (1), wherein the throttle valve body (1) is provided with a corner flow channel (2) and a valve needle mounting hole (3), wherein the valve needle mounting hole (3) is provided with a regulating valve needle (4) for achieving throttling cooperation with the corner flow channel (2), and a sealing component is provided on the regulating valve needle (4) at a position close to the front throttling point; The sealing assembly comprises a sealing installation column (5), an inner groove is formed on the sealing installation column (5), a sliding sealing ring (6) is arranged in the inner groove, the sliding sealing ring (6) is closely attached to the inner wall of the valve needle installation channel (3), and an elastic sealing ring (7) is also arranged between the sliding sealing ring (6) and the inner groove; The end of the sliding sealing ring (6) that contacts the inner wall of the valve needle mounting channel (3) is provided with a double-bevel convex structure (8).

2. A throttling device for a pumped storage power station servomotor with a self-sealing function as claimed in claim 1, characterized in that: The sliding sealing ring (6) and the elastic sealing ring (7) are connected via radial interference fit.

3. A throttling device for a pumped storage power station servomotor with a self-sealing function as claimed in claim 1, characterized in that: A thrust sleeve (9) is provided at the rear end of the regulating valve needle (4), and the thrust sleeve (9) is threadedly connected to a sinking installation hole (10) at the rear end of the valve needle installation channel (3).

4. A throttling device for a pumped storage power station servomotor with a self-sealing function as claimed in claim 3, characterized in that: The thrust sleeve (9) and the regulating valve needle (4) are also locked via a locking nut (11).

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