CN216788494U - Electromagnetic valve group of steam turbine protection system - Google Patents

Abstract

The utility model relates to an electromagnetic valve bank of a steam turbine protection system, in particular to an OPC and AST electromagnetic valve bank, aiming at overcoming the problem that the AST electromagnetic valve can cause unit tripping if misoperation occurs when the existing steam turbine protection system is subjected to ASP test, and the electromagnetic valve bank comprises the OPC electromagnetic valve bank and a corresponding OPC unloading valve bank as well as the AST electromagnetic valve bank and a corresponding AST unloading valve bank; an oil drainage port of the first AST unloading valve and an oil drainage port of the third AST unloading valve are communicated with a DV non-pressure oil return pipeline through a first test stop valve; and an oil drainage port of the second AST unloading valve and an oil drainage port of the fourth AST unloading valve are communicated with the DV non-pressure oil return pipeline through a second test stop valve.

Description

Solenoid valve group of steam turbine protection system

Technical Field

The utility model relates to an OPC and AST electromagnetic valve bank.

Background

The existing steam turbine protection system adopts a centralized structure, wherein AST electromagnetic valves are usually electrified and are arranged in a logical relation of 'two or one and', OPC electromagnetic valves are usually uncharged and are arranged in an 'OR' logical relation. When ASP test is carried out, the unit can jump if AST electromagnetic valve is in misoperation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that when an existing steam turbine protection system is subjected to ASP (active power analysis) tests, if AST electromagnetic valves are in misoperation, unit tripping can be caused, and provides an electromagnetic valve bank of the steam turbine protection system.

The utility model relates to an electromagnetic valve bank of a steam turbine protection system, which comprises an OPC electromagnetic valve bank, a corresponding OPC unloading valve bank, an AST electromagnetic valve bank and a corresponding AST unloading valve bank;

the OPC electromagnetic valve group comprises a first OPC electromagnetic valve and a second OPC electromagnetic valve, and the OPC unloading valve group comprises a first OPC unloading valve and a second OPC unloading valve; a working oil port of the first OPC electromagnetic valve is communicated with a control oil port of the first OPC unloading valve, and a second OPC electromagnetic valve is communicated with a control oil port of the second OPC unloading valve;

the AST electromagnetic valve bank comprises a first AST electromagnetic valve, a second AST electromagnetic valve, a third AST electromagnetic valve and a fourth AST electromagnetic valve, and the AST unloading valve bank comprises a first AST unloading valve, a second AST unloading valve, a third AST unloading valve and a fourth AST unloading valve; a working oil port of the first AST electromagnetic valve is communicated with a control oil port of the first AST unloading valve, a working oil port of the second AST electromagnetic valve is communicated with a control oil port of the second AST unloading valve, a working oil port of the third AST electromagnetic valve is communicated with a control oil port of the third AST unloading valve, and a working oil port of the fourth AST electromagnetic valve is communicated with a control oil port of the fourth AST unloading valve;

the OPC oil pipeline is respectively communicated with an oil inlet of the first OPC unloading valve and an oil inlet of the second OPC unloading valve; the OPC pilot oil pipeline is respectively communicated with oil inlets of the first OPC electromagnetic valve and the second OPC electromagnetic valve;

the AST oil pipeline is respectively communicated with an oil inlet of the first AST unloading valve, an oil inlet of the second AST unloading valve, an oil inlet of the third AST unloading valve and an oil inlet of the fourth AST unloading valve;

the first AST pilot oil pipeline is respectively communicated with an oil inlet of the first AST electromagnetic valve and an oil inlet of the third AST electromagnetic valve;

the second AST pilot oil pipeline is respectively communicated with an oil inlet of the second AST electromagnetic valve and an oil inlet of the fourth AST electromagnetic valve;

an oil drainage port of the first AST unloading valve and an oil drainage port of the third AST unloading valve are communicated with a DV non-pressure oil return pipeline through a first test stop valve; and an oil drainage port of the second AST unloading valve and an oil drainage port of the fourth AST unloading valve are communicated with the DV non-pressure oil return pipeline through a second test stop valve.

The utility model has the beneficial effects that:

the utility model relates to a novel OPC/AST electromagnetic valve bank, which is improved on the structure of the traditional OPC/AST electromagnetic valve, two test stop valves are added, and the stop valves are adopted to seal related oil paths when ASP tests are carried out so as to avoid the electromagnetic valve from being mistakenly tripped.

Drawings

Fig. 1 is a schematic diagram of a pipeline structure of an electromagnetic valve group of a steam turbine protection system according to the present invention;

FIG. 2 is a schematic front view of a frame and an integrated block housing of a solenoid valve assembly of a steam turbine protection system according to the present invention;

fig. 3 is a schematic top view of a frame and an integrated block housing of a solenoid valve assembly of a steam turbine protection system according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

The utility model is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

In a first specific embodiment, an electromagnetic valve bank of a steam turbine protection system in this embodiment includes an OPC electromagnetic valve bank and a corresponding OPC unloading valve bank, and an AST electromagnetic valve bank and a corresponding AST unloading valve bank;

the OPC electromagnetic valve bank comprises a first OPC electromagnetic valve 1-1 and a second OPC electromagnetic valve 2-1, and the OPC unloading valve bank comprises a first OPC unloading valve 1-2 and a second OPC unloading valve 2-2; a working oil port of the first OPC electromagnetic valve 1-1 is communicated with a control oil port of the first OPC unloading valve 1-2, and the second OPC electromagnetic valve 2-1 is communicated with a control oil port of the second OPC unloading valve 2-2;

the AST electromagnetic valve bank comprises a first AST electromagnetic valve 3-1, a second AST electromagnetic valve 4-1, a third AST electromagnetic valve 5-1 and a fourth AST electromagnetic valve 6-1, and the AST unloading valve bank comprises a first AST unloading valve 3-2, a second AST unloading valve 4-2, a third AST unloading valve 5-2 and a fourth AST unloading valve 6-2; a working oil port of the first AST electromagnetic valve 3-1 is communicated with a control oil port of the first AST unloading valve 3-2, a working oil port of the second AST electromagnetic valve 4-1 is communicated with a control oil port of the second AST unloading valve 4-2, a working oil port of the third AST electromagnetic valve 5-1 is communicated with a control oil port of the third AST unloading valve 5-2, and a working oil port of the fourth AST electromagnetic valve 6-1 is communicated with a control oil port of the fourth AST unloading valve 6-2;

the OPC oil pipeline 7 is respectively communicated with an oil inlet of the first OPC unloading valve 1-2 and an oil inlet of the second OPC unloading valve 2-2; the OPC pilot oil pipeline 8 is respectively communicated with oil inlets of the first OPC electromagnetic valve 1-1 and the second OPC electromagnetic valve 2-1, so that the first OPC electromagnetic valve 1-1 and the second OPC electromagnetic valve 2-1 are arranged in an OR logical relationship;

the AST oil pipeline 9 is respectively communicated with an oil inlet of the first AST unloading valve 3-2, an oil inlet of the second AST unloading valve 4-2, an oil inlet of the third AST unloading valve 5-2 and an oil inlet of the fourth AST unloading valve 6-2;

the first AST pilot oil pipeline 10 is respectively communicated with an oil inlet of the first AST electromagnetic valve 3-1 and an oil inlet of the third AST electromagnetic valve 5-1, so that the first AST electromagnetic valve 3-1 and the third AST electromagnetic valve 5-1 are arranged in an OR logical relationship;

the second AST pilot oil pipeline 11 is respectively communicated with an oil inlet of the second AST electromagnetic valve 4-1 and an oil inlet of the fourth AST electromagnetic valve 6-1, so that the second AST electromagnetic valve 4-1 and the fourth AST electromagnetic valve 6-1 are arranged in an OR logical relationship; the first AST electromagnetic valve 3-1 and the third AST electromagnetic valve 5-1, and the second AST electromagnetic valve 4-1 and the fourth AST electromagnetic valve 6-1 are arranged in a logical relation;

an oil drainage port of the first AST unloading valve 3-2 and an oil drainage port of the third AST unloading valve 5-2 are communicated with a DV non-pressure oil return pipeline through a first test stop valve 30; and an oil drainage port of the second AST unloading valve 4-2 and an oil drainage port of the fourth AST unloading valve 6-2 are communicated with a DV non-pressure oil return pipeline 32 through a second test stop valve 31.

Further, the device also comprises a pressure switch and a pressure gauge;

the pressure switches include an OPC pressure switch 12, an AST pressure switch 13, and an ASP pressure switch 14;

the pressure gauges comprise an OPC pressure gauge 15, an AST pressure gauge 16 and an ASP pressure gauge 17;

the OPC pressure switch 12 and the OPC pressure gauge 15 are both connected to the OPC oil pipeline 7 through pipelines;

the AST pressure switch 13 and the AST pressure gauge 16 are both connected to the AST oil pipeline 9 through pipelines;

the ASP pressure switch 14 and the ASP pressure gauge 17 are connected to an AST oil pipeline 9 between the first AST unloading valve 3-2, the third AST unloading valve 5-2, the second AST unloading valve 4-2 and the fourth AST unloading valve 6-2 through pipelines.

Further, an OPC oil supplementing pipeline 18 is also included;

one end of an OPC oil supplementing pipeline 18 is communicated with an oil tank of the turbine protection device system, and the other end of the OPC oil supplementing pipeline is communicated with the OPC oil pipeline 7 through a pipeline.

Further, an AST oil supplementing pipeline 19 is also included;

one end of the AST oil supplementing pipeline 19 is communicated with an oil tank of the steam turbine protection device system, and the other end of the AST oil supplementing pipeline is communicated with the AST oil pipeline 9 through a pipeline.

Further, a frame 20 and an integrated block housing 21 are included;

the pressure switch and the pressure gauge are both fixed above the frame 20;

the integrated block shell 21 is fixed below the frame 20;

the OPC unloading valve bank and the AST unloading valve bank are integrally installed inside the manifold block shell 21, and the OPC electromagnetic valve bank and the AST electromagnetic valve bank are fixed on the outer side wall of the manifold block shell 21.

Further, the device also comprises a cartridge valve pipe joint component;

the cartridge valve pipe joint assembly comprises an AST oil inlet joint 22, an OPC oil inlet joint 23, a DV pressureless oil return joint 24, a first HP high-pressure oil inlet joint 25, a second HP high-pressure oil inlet joint 26, a third HP high-pressure oil inlet joint 27, a fourth HP high-pressure oil inlet joint 28 and a fifth HP high-pressure oil inlet joint 29;

the AST oil inlet joint 22, the OPC oil inlet joint 23, the DV non-pressure oil return joint 24, the first HP high-pressure oil inlet joint 25, the second HP high-pressure oil inlet joint 26, the third HP high-pressure oil inlet joint 27 and the fourth HP high-pressure oil inlet joint 28 are arranged on the side wall of the integrated block shell 21 and are respectively communicated with corresponding pipelines inside the integrated block shell 21;

the AST oil pipeline 9 enters the inside of the integrated block shell 21 through an AST oil inlet joint 22;

the OPC oil pipeline 7 enters the inside of the manifold block shell 21 through an OPC oil inlet joint 23;

the DV non-pressure oil return pipeline 32 enters the inside of the integrated block shell 21 through the DV non-pressure oil return joint 24;

the first AST pilot oil conduit 10 is integrated inside the block housing 21 through a first HP high pressure oil inlet joint 25;

the second AST pilot oil pipe 11 is integrated inside the block housing 21 through the second HP high-pressure oil-in joint 26;

the OPC pilot oil pipeline 8 is integrated inside the block shell 21 through a third HP high-pressure oil inlet joint 27;

the OPC oil replenishment line 18 is integrated inside the block housing 21 through a fourth HP high pressure oil feed connection 28;

the AST oil replenishment line 19 is integrated into the interior of the manifold housing 21 through a fifth HP high pressure oil feed connection 29.

Specifically, two test stop valves are added on the basis of the original structure, the AST function is realized by an independent electromagnetic valve group, wherein the number of AST electromagnetic valves is four, the coils are always electrified and are arranged in an 'two or one and' logical relation, the number of OPC electromagnetic valves is two, the coils are always electrified and are arranged in an 'OR' logical relation. When the corresponding electromagnetic valve acts, the pilot oil on the upper cavity of the unloading valve in the actuating mechanism is discharged, and the function of quickly closing the corresponding actuating mechanism is realized. When the AST electromagnetic valve acts, the OPC oil pipeline releases pressure through the one-way valve and acts therewith. When ASP test is carried out, the first test stop valve 30/the second test stop valve 31 are closed and opened in sequence, and relevant oil paths are closed.

The specific working mode is as follows:

when the unit is overspeed, the OPC electromagnetic valve receives a control signal and is electrified to be opened, so that pressure oil in the upper cavity of the OPC unloading valve is connected with the DV non-pressure oil return pipeline 32 through the OPC electromagnetic valve, the OPC unloading valve is opened, the OPC oil enters the DV non-pressure oil return pipeline 32 through the OPC unloading valve at the moment and flows back to an oil tank, the pressure of the OPC oil is unloaded, the adjusting valve is closed, and due to the existence of the one-way valve 33, the AST oil pressure is not released, and the main valve is not closed.

When the steam turbine trips, the AST electromagnetic valve receives a control signal and is powered off, pressure oil in the upper cavity of the AST unloading valve is connected with the DV non-pressure oil return pipeline 32 through the AST electromagnetic valve, the AST unloading valve is opened, the AST oil enters the DV non-pressure oil return pipeline 32 through the AST unloading valve and flows back to an oil tank, the pressure of the AST oil is removed, the main door is closed, OPC oil flows to the AST oil pipeline 9 through the one-way valve 33 and flows back to the oil tank together with the AST oil, the OPC oil pressure is discharged, and the adjusting door is closed.

When ASP test is carried out, the first test stop valve 30 is closed, and the channels of the second AST electromagnetic valve 4-1 and the fourth AST electromagnetic valve 6-1 are tested; after the first test stop valve 30 is closed, the AST oil circuit is cut off, at the moment, the second AST electromagnetic valve 4-1/the fourth AST electromagnetic valve 6-1 are opened, the ASP oil pressure is reduced to 0, and the pressure of the AST main pipe is not moved.

Closing the second test stop valve 31, and testing channels of the first AST electromagnetic valve 3-1 and the third AST electromagnetic valve 5-1; after the second test stop valve 31 is closed, the AST oil circuit is cut off, at the moment, the first AST electromagnetic valve 3-1/the third AST electromagnetic valve 5-1 are opened, the ASP oil pressure is increased to the normal oil pressure of the system, and the pressure of the AST main pipe is not moved.

Although the utility model herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims (6)

1. An electromagnetic valve bank of a steam turbine protection system is characterized by comprising an OPC electromagnetic valve bank, a corresponding OPC unloading valve bank, an AST electromagnetic valve bank and a corresponding AST unloading valve bank;

the OPC electromagnetic valve bank comprises a first OPC electromagnetic valve (1-1) and a second OPC electromagnetic valve (2-1), and the OPC unloading valve bank comprises a first OPC unloading valve (1-2) and a second OPC unloading valve (2-2); a working oil port of the first OPC electromagnetic valve (1-1) is communicated with a control oil port of the first OPC unloading valve (1-2), and the second OPC electromagnetic valve (2-1) is communicated with a control oil port of the second OPC unloading valve (2-2);

the AST electromagnetic valve bank comprises a first AST electromagnetic valve (3-1), a second AST electromagnetic valve (4-1), a third AST electromagnetic valve (5-1) and a fourth AST electromagnetic valve (6-1), and the AST unloading valve bank comprises a first AST unloading valve (3-2), a second AST unloading valve (4-2), a third AST unloading valve (5-2) and a fourth AST unloading valve (6-2); a working oil port of the first AST electromagnetic valve (3-1) is communicated with a control oil port of the first AST unloading valve (3-2), a working oil port of the second AST electromagnetic valve (4-1) is communicated with a control oil port of the second AST unloading valve (4-2), a working oil port of the third AST electromagnetic valve (5-1) is communicated with a control oil port of the third AST unloading valve (5-2), and a working oil port of the fourth AST electromagnetic valve (6-1) is communicated with a control oil port of the fourth AST unloading valve (6-2);

the OPC oil pipeline (7) is respectively communicated with an oil inlet of the first OPC unloading valve (1-2) and an oil inlet of the second OPC unloading valve (2-2); the OPC pilot oil pipeline (8) is respectively communicated with oil inlets of the first OPC electromagnetic valve (1-1) and the second OPC electromagnetic valve (2-1);

the AST oil pipeline (9) is respectively communicated with an oil inlet of the first AST unloading valve (3-2), an oil inlet of the second AST unloading valve (4-2), an oil inlet of the third AST unloading valve (5-2) and an oil inlet of the fourth AST unloading valve (6-2);

the first AST pilot oil pipeline (10) is respectively communicated with an oil inlet of the first AST electromagnetic valve (3-1) and an oil inlet of the third AST electromagnetic valve (5-1);

the second AST pilot oil pipeline (11) is respectively communicated with an oil inlet of a second AST electromagnetic valve (4-1) and an oil inlet of a fourth AST electromagnetic valve (6-1);

an oil drainage port of the first AST unloading valve (3-2) and an oil drainage port of the third AST unloading valve (5-2) are communicated with a DV non-pressure oil return pipeline through a first test stop valve (30); an oil drainage port of the second AST unloading valve (4-2) and an oil drainage port of the fourth AST unloading valve (6-2) are communicated with a DV non-pressure oil return pipeline (32) through a second test stop valve (31).

2. The solenoid valve group of a steam turbine protection system according to claim 1, further comprising a pressure switch and a pressure gauge;

the pressure switches comprise an OPC pressure switch (12), an AST pressure switch (13) and an ASP pressure switch (14);

the pressure gauges comprise an OPC pressure gauge (15), an AST pressure gauge (16) and an ASP pressure gauge (17);

the OPC pressure switch (12) and the OPC pressure gauge (15) are both connected into the OPC oil pipeline (7) through pipelines;

the AST pressure switch (13) and the AST pressure gauge (16) are both connected to the AST oil pipeline (9) through pipelines;

the ASP pressure switch (14) and the ASP pressure gauge (17) are connected to an AST oil pipeline (9) between the first AST unloading valve (3-2), the third AST unloading valve (5-2) and the second AST unloading valve (4-2) and the fourth AST unloading valve (6-2) through pipelines.

3. Solenoid valve group of a turbine protection system according to claim 1, characterized in that it further comprises an OPC oil supply line (18);

one end of an OPC oil supplementing pipeline (18) is communicated with an oil tank of a turbine protection device system, and the other end of the OPC oil supplementing pipeline is communicated with an OPC oil pipeline (7) through a pipeline.

4. The solenoid valve group of a turbine protection system according to claim 1, further comprising an AST oil supply line (19);

one end of the AST oil supplementing pipeline (19) is communicated with an oil tank of the steam turbine protection device system, and the other end of the AST oil supplementing pipeline is communicated with the AST oil pipeline (9) through a pipeline.

5. Valve group of solenoid valves of a turbine protection system according to claims 1, 2, 3 or 4, characterized by the fact that it comprises a frame (20) and an integrated block casing (21);

the pressure switch and the pressure gauge are both fixed above the frame (20);

the integrated block shell (21) is fixed below the frame (20);

the OPC unloading valve bank and the AST unloading valve bank are integrally installed inside the integrated block shell (21), and the OPC electromagnetic valve bank and the AST electromagnetic valve bank are fixed on the outer side wall of the integrated block shell (21).

6. The solenoid valve block of a turbine protection system of claim 5, further comprising a cartridge valve coupling assembly;

the cartridge valve pipe joint assembly comprises an AST oil inlet joint (22), an OPC oil inlet joint (23), a DV non-pressure oil return joint (24), a first HP high-pressure oil inlet joint (25), a second HP high-pressure oil inlet joint (26), a third HP high-pressure oil inlet joint (27), a fourth HP high-pressure oil inlet joint (28) and a fifth HP high-pressure oil inlet joint (29);

the AST oil inlet joint (22), the OPC oil inlet joint (23), the DV non-pressure oil return joint (24), the first HP high-pressure oil inlet joint (25), the second HP high-pressure oil inlet joint (26), the third HP high-pressure oil inlet joint (27) and the fourth HP high-pressure oil inlet joint (28) are all arranged on the side wall of the integrated block shell (21) and are respectively communicated with corresponding pipelines inside the integrated block shell (21);

the AST oil pipeline (9) enters the inside of the integrated block shell (21) through an AST oil inlet joint (22);

the OPC oil pipeline (7) enters the inside of the integrated block shell (21) through an OPC oil inlet joint (23);

the DV non-pressure oil return pipeline (32) enters the inside of the integrated block shell (21) through a DV non-pressure oil return joint (24);

the first AST pilot oil pipeline (10) is integrated inside the integrated block shell (21) through a first HP high-pressure oil inlet joint (25);

the second AST pilot oil pipeline (11) is integrated inside the block shell (21) through a second HP high-pressure oil inlet joint (26);

the OPC pilot oil pipeline (8) is integrated inside the block shell (21) through a third HP high-pressure oil inlet joint (27);

an OPC oil supplementing pipeline (18) is integrated in the shell (21) through a fourth HP high-pressure oil inlet joint (28);

and the AST oil supplementing pipeline (19) is integrated inside the integrated shell (21) through a fifth HP high-pressure oil inlet joint (29).

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