CN201059240Y - A kind of overspeed protection device for hydroelectric generating set - Google Patents

Abstract

The utility model relates to an overspeed protection device for a water turbine generating set. The utility model belongs to the technical field of water turbines. The overspeed protection device of the hydro-generator set includes a valve body and a valve core. The valve body is equipped with a valve core; Pressure oil chamber and oil return chamber; when the hydro-generator set is in normal operation, the spool is connected to the main distribution opening chamber of the governor and the opening chamber of the servomotor, the closing chamber of the governor and the closing chamber of the servomotor, and the pressure oil chamber of the accident pressure distribution valve is cut off. Oil return chamber; when the hydro-generator set runs at overspeed, the spool moves to cut off the main distribution opening chamber of the governor and the closing chamber of the governor, and connects the pressure oil chamber of the emergency pressure distribution valve with the servomotor closing chamber, and the accident pressure distribution chamber. The oil return chamber of the valve is open to the servomotor. The utility model has the advantages of high degree of integration, small size, light weight, convenient installation, good stability, and avoids oil leakage or oil leakage caused by improper installation.

Description

A kind of overspeed protection device for hydroelectric generating set

technical field

The utility model belongs to the technical field of water turbines, in particular to an overspeed protection device for a water turbine generating set.

Background technique

At present, the commonly used overspeed protection devices for hydro-generator sets are composed of discrete components, see Figure 4. It is mainly composed of two-position four-way solenoid valve 1, 2DP, oil valve 1, 2SYF, adjustable oil valve 3, 4SYF, etc. The specific operating principle is as follows: The closing cavity is connected with the switching cavity of the servomotor through the oil valves 1SYF and 2SYF to adjust the guide vane servomotor. The control of the oil valves 1SYF and 2SYF is controlled by the electromagnetic pressure distribution valve 1DP. When the unit is over-speeded and the governor fails, a signal is sent to de-energize the electromagnetic pressure distribution valve 1DP, and the oil valves 1SYF and 2SYF are cut off; the electromagnetic pressure distribution valve 2DP is electrified, and the control oil valves 3SYF and 4SYF are opened, and the oil pressure device The pressure oil is connected to the closed cavity of the servomotor through the oil valve 3SYF, and the open cavity of the servomotor is connected to the oil discharge through the oil valve 4SYF. The oil valves 3SYF and 4SYF are designed as adjustable oil valves. The adjustment is within the allowable range. The disadvantage of this solution is that the installation is complicated, especially for inexperienced installation teams, it is easy to cause improper installation and oil leakage. At the same time, due to the large number of various valves, once a valve fails, the entire system will be paralyzed. .

Contents of the invention

The utility model provides an overspeed protection device for a hydroelectric generating set in order to solve the technical problems existing in the known technology.

The purpose of the utility model is to provide an integrated hydroelectric generating set overspeed protection device with high degree of integration, small volume, light weight, convenient installation and good stability.

The utility model takes the following technical solutions:

The overspeed protection device of the hydro-generator set is a two-position six-way reversing valve, which is characterized in that: the valve core in the valve body is reversing under the action of differential pressure; Closing cavity, servomotor opening cavity, closing cavity, emergency pressure distribution valve pressure oil cavity, oil return cavity connected oil port; The opening and closing cavities of the distribution are respectively connected with the opening and closing cavities of the servomotor, and the adjustment of the operating conditions of the unit is realized through the main operation servomotor of the governor. When the governor fails and the speed of the unit is too high, the spool moves downward under the action of differential pressure, which will cut off the control circuit of the governor. The open cavity of the device is connected to the oil return. The water guiding mechanism of the hydraulic turbine is closed under the operation of the servomotor, thereby realizing the shutdown of the hydraulic turbine generator set.

The utility model can also adopt the following technical measures:

The characteristics of the overspeed protection device of the hydroelectric generating set are that the spool is movable, and the spool is a concentric cylinder structure with different diameters.

The above-mentioned overspeed protection device for hydro-generator sets is characterized in that: the two ends of the valve core have different sections, and the two ends are respectively connected to pressure oil through oil pipes, and one end of the oil pipe is connected to a two-position three-way solenoid valve; the two-position three-way solenoid valve is in the Under the control of the overspeed protection signal, the switch cuts off the pressure oil, and the oil pipe is connected back to the oil pipe to make the valve core move under the action of differential pressure.

The characteristics of the overspeed protection device of the hydroelectric generator set are: the valve core is movable, and the valve core is a cylindrical structure with grooves or oil holes.

The utility model has advantages and positive effects:

Compared with the existing overspeed protection device for hydroelectric generating sets, the utility model has the characteristics of high integration degree, small volume and light weight. Compared with the overspeed protection composed of traditional discrete components, the biggest advantage is that it is easy to install, has good stability, and avoids oil leakage or oil leakage caused by improper installation.

Description of drawings

Fig. 1 is the utility model sectional structure schematic diagram;

Fig. 2 is a schematic diagram of the left view structure of Fig. 1;

Fig. 3 is a working principle diagram of the utility model;

Fig. 4 is a schematic diagram of the overspeed protection structure of a hydraulic turbine in the prior art.

In the figure, 1-oil pipe, 2-oil pipe, 3-spool, 4-solenoid valve, 5-valve body.

Detailed ways

In order to further understand the content, characteristics and effects of the present utility model, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Refer to accompanying drawing 1, Fig. 2, Fig. 3 and Fig. 4.

The overspeed protection device of the hydroelectric generating set includes a valve body and a valve core, and the valve body 5 is provided with a valve core 3 . The spool 3 is a movable concentric cylindrical structure with different diameters. The two ends of the spool 3 have different cross-sections, and the two ends are respectively connected to the pressure oil through the oil pipe 1 and the oil pipe 2, and one end of the oil pipe 2 is connected to the two-position three-way solenoid valve 4; the two-position three-way solenoid valve 4 is reversed under the control of the overspeed protection signal Cut off the pressure oil, connect the oil pipe 2 back to the oil pipe, and make the valve core 3 move under the action of differential pressure. The valve body is provided with the turbine governor main matching opening chamber B, closing chamber D, servomotor opening chamber A, closing chamber C, emergency pressure distribution valve pressure oil chamber P, and oil return chamber O; when the turbine is in normal operation, the spool 3 is in the upper position , the spool 3 is connected to the governor main distribution opening chamber B and the servomotor opening chamber A, the governor closing chamber D and the servomotor closing chamber C, and cuts off the emergency pressure distribution valve pressure oil chamber P and the oil return chamber O; when the speed is adjusted When the speed of the unit is too high due to a malfunction of the generator, the spool 3 is in the lower position, and the spool 3 cuts off the main distribution opening chamber B of the governor and the closing chamber D of the governor, and connects the pressure oil chamber P of the accident pressure distribution valve with the closing chamber of the servomotor C. Emergency pressure distribution valve oil return chamber O and servomotor opening chamber A. The water guiding mechanism of the water turbine realizes the protection of the water turbine generator set under the operation of the servomotor.

The structure of this embodiment and its working process:

The overspeed protection device of the hydro-generator set is an automatic component integrating the electromagnetic pressure distribution valve, oil valve and emergency pressure distribution valve. Its working principle is shown in Figure 1, Figure 2, and Figure 3: At this time, pipe 1 and pipe 2 are both connected to pressure oil, and valve core 3 is in the upper position under the action of differential pressure. The opening cavity of the servomotor is connected with the valve closing cavity, that is, the B cavity is connected with the A cavity, and the D cavity is connected with the C cavity. When the speed governor fails, the speed of the unit is too high, and the speed governor cannot complete the operation of closing the water guide mechanism through the servomotor, the two-position three-way solenoid valve at the front end of the pipe 2 receives the over-speed protection signal, and the two-position three-way valve Reversing, cut off the pressure oil, pipe 2 is connected back to the oil, the valve core 3 moves downward under the action of differential pressure, the valve body realizes reversing, cuts off the control circuit of the governor, at this time, P cavity and C cavity are connected, Chamber A is connected to chamber O, and the emergency pressure distribution valve connects the pressure oil of the oil system with the closing chamber of the servomotor, and the opening chamber of the servomotor connects the oil back, and the water guiding mechanism of the turbine is closed under the operation of the servomotor, thereby realizing Shutdown of hydroelectric generating units.

Claims (4)

1. A hydroelectric generating set overspeed protection device, comprising a valve body and a spool, the valve body has a spool, and is characterized in that: the valve body (5) is provided with a spool (3); The main chamber of the gearbox is opened (B) and closed (D), the servomotor is opened (A) and closed (C), the pressure oil chamber (P) and the oil return chamber (O) of the emergency pressure distribution valve; when the turbine is in normal operation , the spool (3) is connected to the governor main distribution opening chamber (B) and the servomotor opening chamber (A), the governor closing chamber (D) and the servomotor closing chamber (C), and cuts off the emergency pressure distribution valve pressure oil chamber ( P) and the oil return chamber (O); when the hydro-generator set is running at an overspeed, the spool (3) will cut off the main distribution opening chamber (B) of the governor and the closing chamber (D) of the governor after the movement of the hydro-generator set to connect the accident The pressure oil cavity (P) of the pressure distribution valve and the closed cavity (C) of the servomotor, the oil return cavity (O) of the emergency pressure distribution valve and the open cavity (A) of the servomotor. 2. The overspeed protection device for hydro-generator set according to claim 1, characterized in that: the spool (3) is movable, and the spool (3) is a concentric cylinder structure with different diameters. 3. The overspeed protection device for hydro-generator set according to claim 2, characterized in that: the two ends of the spool (3) have different cross-sections, and the two ends are respectively connected to pressure oil through oil pipes (1, 2), and one end of the oil pipe ( 2) Connect to the two-position three-way solenoid valve; the two-position three-way solenoid valve switches direction and cuts off the pressure oil under the control of the overspeed protection signal, and the oil pipe (2) is connected back to the oil pipe to make the valve core (3) move under the action of differential pressure. 4. The overspeed protection device for hydro-generator set according to claim 1, characterized in that: the spool (3) is movable, and the spool (3) is a cylindrical structure with grooves or oil holes.

Images