Slide valve type emergency distributing valve damping plug structure with reset spring
By introducing a return spring and damping ring structure into the slide valve accident pressure distribution valve, the problem of operational impact and return difficulties is solved, and better buffering effect and stability of valve core position is achieved.
Patent Information
- Application Number
- CN202420216563.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-29
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-01-29
AI Technical Summary
The existing slip valve accident pressure distribution valve has a large impact during overspeed protection, which is difficult to return and is prone to mismoving due to oil flow impact, resulting in equipment and pipeline vibration and unstable valve core position.
Design a slide valve accident pressure-distribution valve damping plug structure with return spring, including a damping ring, throttle plug and return spring. The return spring is fixed in the cavity of the damping ring, protrudes from the end surface of the valve core, and is damped through The T-shaped cylindrical structure and step-like end of the ring are secured to the valve body and end cap to provide additional spring force support and cushioning.
It effectively reduces vibrations of equipment and pipelines, promotes the re-returning action of the valve core, avoids erroneous movement, and ensures the stability of the valve core in the re-returning position.
Smart Images
Figure CN222209131U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of a damping plug of a pressure distribution valve, in particular to a damping plug structure of a slide valve type emergency pressure distribution valve with a reset spring. Background Art
[0002] The slide valve type emergency pressure regulating valve is generally a two-position six-way reversing valve, which is used in the overspeed protection system of the turbine generator set in the hydropower station. When the unit speed is too high and the governor fails to close the water guiding mechanism, the emergency pressure regulating valve control valve receives the overspeed protection signal and operates. The pressure oil acts on the valve core of the emergency pressure regulating valve to make it operate, cut off the governor, and the pressure oil in the oil system directly operates the relay of the water guiding mechanism to close the water guiding mechanism in an emergency.
[0003] like Figure 1 As shown in the figure, when the valve core moves, the original damping plug of the conventional emergency pressure-matching valve only buffers the impact of the valve core movement by throttling the oil. The actual buffering effect is general, and the vibration of the equipment and pipelines is still large. After the control valve of the emergency pressure-matching valve is restored, the valve core of the emergency pressure-matching valve only relies on the pressure difference formed between the valve discs to return, and the situation of difficulty in restoration often occurs. Moreover, in the actual operation process, the situation of malfunction of the valve core of the emergency pressure-matching valve due to the impact of oil flow also occurs from time to time. Utility Model Content
[0004] In view of the deficiencies in the prior art, the utility model provides a slide valve type emergency pressure regulating valve damping plug structure with a return spring. In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:
[0005] A sliding valve type emergency pressure regulating valve damping plug structure with a return spring is installed in the valve body and located at one end of the valve core, including a damping ring, a throttle plug and a return spring. The throttle plug body is provided with a throttle hole. The throttle plug is fixedly installed on the top of the damping ring and connects the two ends of the damping ring. A cylindrical cavity is opened on the damping ring. The return spring is fixedly arranged in the cavity. The other end of the return spring protrudes from the side of the damping ring and abuts against the end face of the valve core.
[0006] Furthermore, the damping ring is a T-shaped cylindrical structure, and the damping ring is fixedly clamped between the valve body and the end cover.
[0007] Furthermore, the end of the damping ring is a stepped structure, and the end surface of the valve core is provided with a concave cavity matching the damping ring.
[0008] Furthermore, a backing plate is fixedly connected to the end of the return spring, and the backing plate is flush with the end surface of the valve core.
[0009] Compared with the prior art, the utility model has the following beneficial effects:
[0010] 1) By adding a reset spring in the design, when the valve core of the emergency pressure regulating valve moves, the resistance of the spring is increased, so that the valve core has a better buffering effect and reduces the vibration of the equipment and pipelines;
[0011] 2) When the accident pressure regulating valve returns to the working condition, the return spring adds a return spring force to the valve core, which helps the valve core to return to the action;
[0012] 3) Due to the presence of the return spring, it can resist the force generated by the impact of oil flow, avoid malfunction of the valve core of the accident pressure regulating valve during operation, and better maintain it in the return position. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments:
[0014] Figure 1 This is a schematic diagram of the damping plug structure of the original pressure distribution valve;
[0015] Figure 2 This is a schematic diagram of the assembly structure of the damping plug of the utility model.
[0016] In the above drawings: valve body 1, valve core 2, damping ring 3, throttle plug 4, original damping plug 5, return spring 6, concave cavity 7, gasket 8, cavity 9. DETAILED DESCRIPTION
[0017] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0018] like Figure 2 As shown, the embodiment of the utility model proposes a sliding valve type emergency pressure regulating valve damping plug structure with a return spring, which is installed in the valve body 1 and located at one end of the valve core 2, including a damping ring 3, a throttle plug 4 and a return spring 6. The throttle plug 4 body is provided with a throttle hole. The throttle plug 4 is fixedly installed on the top of the damping ring 3 and connects the two ends of the damping ring 3. A cylindrical cavity 9 is opened on the damping ring 3. The return spring 6 is fixedly arranged in the cavity 9. The other end of the return spring 6 protrudes from the side of the damping ring 3 and rests on the end face of the valve core 2.
[0019] The working process is as follows:
[0020] Emergency pressure relief valve core action condition: Figure 2In the process, the oil source cavity on the right side of the emergency pressure distribution valve passes through the pressure oil, causing the valve core 2 of the emergency pressure distribution valve to move to the left. At this time, the throttle plug 4 plays the role of oil throttling, and the return spring 6 increases due to the valve core 2 moving to the left and being compressed, generating an increased spring force to the right. Under the throttling effect and the spring force, the action of the valve core 2 is buffered, reducing the vibration of the equipment and pipelines. At the same time, through reasonable design, the effect of the oil source liquid pressure on the right side is significantly greater than the spring force, ensuring that the normal accident action of the valve core 2 of the emergency pressure distribution valve is not affected after adding the return spring.
[0021] The working condition of the valve core of the emergency pressure regulating valve is as follows: the valve core 2 is a three-valve disc structure, and the valve disc size increases from left to right, so the rightward restoring liquid pressure is formed, and the reset spring 6 is in a compressed state at this time, and there is a rightward spring force acting on the valve core 2. Under the joint action of the restoring liquid pressure and the spring force, it is easier for the valve core 2 to return to the right position.
[0022] Normal operating conditions: During normal operation, the emergency pressure regulating valve, as the oil channel from the switch chamber of the main pressure regulating valve to the switch chamber of the guide vane servo, forms a rightward hydraulic pressure under the pressure of the switch chamber by relying on the difference in valve disc area to maintain the normal return position of the valve core 2, because after the damping ring 3 with the return spring 6 is installed, the valve core 2 has an initial rightward return spring force. This is equivalent to the valve core 2 being better maintained at the right return position under the combined action of the operating hydraulic pressure and the spring force.
[0023] In order to facilitate the positioning of the damping ring 3, as shown in FIG. Figure 2 As shown, the damping ring 3 is a T-shaped cylindrical structure, and the damping ring 3 is fixedly clamped between the valve body 1 and the end cover.
[0024] In order to hydraulically buffer the valve core 2 after the valve core 2 moves to the left, as shown in FIG. Figure 2 As shown, the end of the damping ring 3 is a stepped structure, and the end surface of the valve core 2 is provided with a concave cavity 7 that matches the damping ring 3. When the valve core 2 moves to the left, it partially retracts into the concave cavity 7 to form a relatively closed oil cavity, and the oil is mainly discharged through the throttle plug 4, which plays a better hydraulic buffering role.
[0025] In order to reduce the damage to the valve core and make the damping ring move more smoothly, such as Figure 2 As shown, a backing plate 8 is fixedly connected to the end of the return spring 6 , and the backing plate 8 is flush with the end surface of the valve core 2 .
[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A damping plug structure of a slide valve type emergency pressure regulating valve with a return spring, which is installed in the valve body and located at one end of the valve core. It is characterized in that It includes a damping ring, a throttle plug and a return spring. The throttle plug body is provided with a throttle hole. The throttle plug is fixedly installed on the top of the damping ring and connects the two ends of the damping ring. A cylindrical cavity is opened on the damping ring. The return spring is fixedly arranged in the cavity. The other end of the return spring protrudes from the side of the damping ring and abuts against the end face of the valve core.
2. A damping plug structure of a sliding valve type emergency pressure regulating valve with a return spring as claimed in claim 1, Features: The damping ring is a T-shaped cylindrical structure, and the damping ring is fixedly clamped between the valve body and the end cover.
3. A damping plug structure of a sliding valve type emergency pressure regulating valve with a return spring as claimed in claim 2, Features: The end of the damping ring is a stepped structure, and the end surface of the valve core is provided with a concave cavity matched with the damping ring.
4. A damping plug structure of a sliding valve type emergency pressure regulating valve with a return spring as claimed in claim 1, Features: The end of the return spring is fixedly connected with a pad, and the pad is flush with the end surface of the valve core.