Power station water inlet valve operating mechanism with two-stage closing function

Abstract

The utility model relates to the technical field of power station valves, and discloses a power station water inlet valve operating mechanism with a two-stage closing function, which comprises a valve body, a crank is rotatably connected to the side surface of the valve body, a heavy hammer is fixedly connected to the end part of the crank, and a servomotor is hinged to the outer side of the crank. The bottom of the servomotor is movably connected with a support, and a pin shaft is connected to the inner side of the support in an inserted mode and used for fixing the servomotor. The water inlet valve of the hydropower station can be closed fast in front and slow in back, water flow can be effectively and fast adjusted and cut off, water hammer pressure of a pipeline is reduced, and hydraulic oscillation is relieved; through the two-stage closing function of the water inlet valve and linkage closing of the guide vane, the requirement for adjusting and guaranteeing parameter limiting values can be met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of power station valve, concretely is the water inlet valve operating mechanism of power station with two stage closing function. BACKGROUND

[0002] In the hydropower station, the valve is an important fluid control equipment, which is used for adjusting and cutting off the flow of medium. In medium and high head pumped storage power station, in order to meet the requirement of limiting value of regulating guarantee parameter, the water inlet valve two-stage and guide vane linkage closing law is adopted, that is, through the use of water inlet valve, it is quickly closed to 70% to 80% first, and then slowly closed and combined with the slow closing of guide vane, so as to reduce the hydraulic impact and water hammer.

[0003] The water inlet valve operating mechanism of medium and high head pumped storage power station usually adopts double force amplifier, and the valve is closed through hydraulic drive force amplifier. At present, the following problems exist:

[0004] 1. The existing water inlet valve operating mechanism of power station usually adopts linear closing law; in medium and high head pumped storage power station, this closing mode will cause large water hammer pressure and water hammer in waterway pipeline, which will cause harm to the pipeline.

[0005] 2. The two-stage speed regulation function of the existing hydraulic system is usually realized through the speed regulation valve on the independent oil way integration block. There is a pipeline between the oil way integration block and the force amplifier, wherein the moving part is connected by high-pressure rubber pipe or rotary joint; when the rubber pipe bursts or the pipeline joint is accidentally disconnected, the water inlet valve will lose speed and close, which will cause harm to the power station unit. INVENTION CONTENTS

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme: the water inlet valve operating mechanism of power station with two-stage closing function, comprising a valve body, the side surface of the valve body is rotationally connected with a crank, the end of the crank is fixedly connected with a weight, the outer side of the crank is hingedly connected with a force amplifier, the bottom of the force amplifier is movably connected with a support, the inner side of the support is inserted with a pin shaft, which is used for fixing the force amplifier.

[0007] Preferably, the force amplifier comprises an upper ear ring, an upper end cover, a piston rod, a cylinder body, a piston, a buffer rod, a lower end cover and a rotary joint, the top of the support is supported with the lower end cover, the top of the lower end cover is fixedly connected with the cylinder body, the top of the cylinder body is fixedly connected with the upper end cover, the top of the lower end cover is fixedly connected with the buffer rod in the cylinder body, the inner wall of the cylinder body is slidably connected with the piston rod at the top of the buffer rod, the top of the piston rod is fixedly connected with the upper ear ring, the bottom of the piston rod is fixedly connected with the piston, and the inner side of the lower end cover is movably connected with the rotary joint through the pipeline.

[0008] Preferably, the inner side of the lower end cover is fixedly connected with a throttle plate, and the inner side of the lower end cover is fixedly connected with a one-way valve at the corresponding position of the throttle plate.

[0009] Preferably, the piston is tightly attached to the inner wall of the cylinder body, the buffer rod is located at the inner side of the piston rod, and the piston rod can slide along the buffer rod.

[0010] Preferably, the inner side of the cylinder body is communicated with the rod cavity oil port through a pipeline, and the rotary joint is communicated with the rodless cavity oil port.

[0011] Compared with the prior art, the utility model has the beneficial effects that:

[0012] 1. The utility model can realize fast closing in front and slow closing in back of the water inlet valve of a hydropower station, can effectively and quickly adjust and cut off water flow, reduce pipeline water hammer pressure and reduce hydraulic shock; through the two-stage closing function of the water inlet valve and the closing linkage of the guide vane, the requirement of regulating and guaranteeing parameter limit value can be met.

[0013] 2. The utility model, the two-stage closing function is built in the operating mechanism servomotor, when the rubber tube bursts or the pipeline joint is accidentally disconnected, the water inlet valve will not stall and close.

[0014] 3. The utility model, the hydraulic system speed regulation control is simple, and the manufacturing and maintenance cost is reduced. DRAWINGS

[0015] The drawings are used to provide further understanding of the utility model, and constitute a part of the specification, are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0016] Figure 1 It is the side view structural schematic drawing of the operating mechanism of the water inlet valve of the hydropower station with the two-stage closing function of the utility model;

[0017] Figure 2 It is the front view structural schematic drawing of the operating mechanism of the water inlet valve of the hydropower station with the two-stage closing function of the utility model;

[0018] Figure 3 It is the servomotor structural schematic drawing of the utility model;

[0019] Figure 4 It is the sectional structure schematic drawing of servomotor A-A of the utility model.

[0020] In the figure: 101-relay; 102-crank; 103-weight; 104-valve body; 201-upper earring; 202-upper end cover; 203-piston rod; 204-cylinder body; 205-piston; 206-buffer rod; 207-lower end cover; 208-rotating joint; 209-pin; 210-support; 211-throttle plate; 212-check valve. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] Example, by Figures 1-4 The utility model discloses an operating mechanism for a water inlet valve of a power station with a two-stage closing function, comprising a valve body 104, a crank 102 rotatably connected to the side of the valve body 104, a weight 103 fixedly connected to the end of the crank 102, a servomotor 101 hingedly connected to the outer side of the crank 102, a support 210 movably connected to the bottom of the servomotor 101, a pin 209 inserted into the inner side of the support 210 for fixing the servomotor 101;

[0023] The relay 101 includes an upper earring 201, an upper end cover 202, a piston rod 203, a cylinder body 204, a piston 205, a buffer rod 206, a lower end cover 207 and a rotary joint 208. The top of the support 210 supports the lower end cover 207, the top of the lower end cover 207 is fixedly connected to the cylinder body 204, the top of the cylinder body 204 is fixedly connected to the upper end cover 202, the top of the lower end cover 207 is located in the cylinder body 204 and is fixedly connected to the buffer rod 206, the inner wall of the cylinder body 204 is located at the top of the buffer rod 206 and is slidably connected to the piston rod 203, the top of the piston rod 203 is fixedly connected to the upper earring 201, the bottom of the piston rod 203 is fixedly connected to the piston 205, and the inner side of the lower end cover 207 is movably connected to the rotary joint 208 through a pipe.

[0024] Specifically, a throttle plate 211 is fixedly connected to the inner side of the lower end cover 207, and a one-way valve 212 is fixedly connected to the inner side of the lower end cover 207 at a position corresponding to the throttle plate 211;

[0025] Specifically, the piston 205 is tightly fitted to the inner wall of the cylinder 204, the buffer rod 206 is located inside the piston rod 203, and the piston rod 203 can slide along the buffer rod 206;

[0026] Specifically, the inner side of the cylinder body 204 is communicated with the oil port of the rod chamber through a pipeline, and the rotary joint 208 is communicated with the oil port of the rodless chamber.

[0027] Working principle: During operation, double servomotors and double hammer mechanisms are symmetrically arranged on both sides of a large valve. The servomotor 101 is driven hydraulically to realize valve movement.

[0028] When a valve opening command is issued, the hydraulic system pressure oil is controlled to enter the rodless chamber of the relay 101, and the piston rod 203 pushes the crank to rotate 90 degrees, so that the valve is fully opened.

[0029] When the valve closing command is issued, the rodless cavity of the control relay 101 is connected to the return oil circuit of the hydraulic system. Since the crank is connected to a heavy hammer, the relay piston rod retracts and the valve closes.

[0030] During the valve closing process, there are two stages of speed regulation. Figure 2 As shown, in the first stage: the piston rod 203 of the relay retracts and moves downward, and the buffer rod 206 does not enter the inner hole of the piston rod 203. The hydraulic oil in the rodless chamber of the relay 101 can flow out simultaneously from the dual-channel oil circuits of the rotary joint 208 and the throttle plate 211. The oil circuit has a large diameter and low pressure loss, allowing the water inlet valve to close quickly. In the second stage: the buffer rod 206 enters the inner hole of the piston rod 203, and the hydraulic oil in the rodless chamber of the relay 101 is divided into two independent oil chambers. The hydraulic oil in one oil chamber flows out from the rotary joint 208; the hydraulic oil in the buffer chamber of the other oil chamber flows out from the oil port of the throttle plate 211. The throttle plate 211 regulates the oil circuit flow rate, allowing the water inlet valve to close slowly.

[0031] During valve opening and closing, servo support 201 undergoes a small rotational motion along pin 209. Connected via rotary joint 208, this solves the problem of high-flow oil circuit connectivity. Weight 103 is symmetrically arranged around the valve body 104, employing a rigid connection. Furthermore, servo 101 utilizes the same structural and interface dimensions, enhancing synchronization during valve closing.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power plant intake valve operating mechanism having a two-stage closing function, comprising a valve body (104), characterized in that: The side of the valve body (104) is rotationally connected with a crank (102), the end of the crank (102) is fixedly connected with a weight (103), the outer side of the crank (102) is hingedly connected with a booster (101), the bottom of the booster (101) is movably connected with a support (210), the inner side of the support (210) is inserted with a pin shaft (209) for fixing the booster (101).

2. The power plant intake valve operating mechanism having a two-stage closing function according to claim 1, characterized by: The booster (101) comprises an upper ear ring (201), an upper end cover (202), a piston rod (203), a cylinder body (204), a piston (205), a buffer rod (206), a lower end cover (207) and a rotary joint (208), the top of the support (210) supports the lower end cover (207), the top of the lower end cover (207) is fixedly connected with the cylinder body (204), the top of the cylinder body (204) is fixedly connected with the upper end cover (202), the top of the lower end cover (207) is fixedly connected with the buffer rod (206) in the cylinder body (204), the inner wall of the cylinder body (204) is slidingly connected with the piston rod (203) at the top of the buffer rod (206), the top of the piston rod (203) is fixedly connected with the upper ear ring (201), the bottom of the piston rod (203) is fixedly connected with the piston (205), and the inner side of the lower end cover (207) is movably connected with the rotary joint (208) through a pipeline.

3. The power plant intake valve operating mechanism having a two-stage closing function according to claim 2, characterized by: The inner side of the lower end cover (207) is fixedly connected with a throttle plate (211), and the inner side of the lower end cover (207) is fixedly connected with a one-way valve (212) at the corresponding position of the throttle plate (211).

4. The power plant intake valve operating mechanism having a two-stage closing function according to claim 2, characterized by: The piston (205) is tightly attached to the inner wall of the cylinder body (204), the buffer rod (206) is located at the inner side of the piston rod (203), and the piston rod (203) can slide along the buffer rod (206).

5. The power plant intake valve operating mechanism having a two-stage closing function according to claim 2, characterized by: The inner side of the cylinder body (204) is communicated with the rod cavity oil port through a pipeline, and the rotary joint (208) is communicated with the rodless cavity oil port.

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