Control device for emergency cut-off valve

Abstract

The utility model provides a control device of an emergency cut-off valve. The control device of the emergency cut-off valve comprises a first electromagnetic valve YV1, a bypass valve V3, a three-way valve V4 and a control air cylinder V5. The first electromagnetic valve YV1 is arranged on a first control branch, one end of the first control branch is connected with a control air source through an air inlet pipe, and the other end of the first control branch is connected with the first end of the three-way valve V4 through a pipeline. The bypass valve V3 is arranged on a third control branch, one end of the third control branch is connected with a control air source through an air inlet pipe, and the other end of the third control branch is connected with the second end of the three-way valve V4 through a pipeline. The third end of the three-way valve V4 is connected with a control cylinder V5 through a pipeline; the control air cylinder V5 is used for being connected with the emergency cut-off valve V6. Furthermore, the control device of the emergency cut-off valve further comprises a second electromagnetic valve YV2, and the second electromagnetic valve YV2 is arranged on a second control branch. According to the utility model, dual-redundancy control is realized, and the operation safety of a unit is greatly improved.

Description

Technical Field

[0001] The utility model relates to control equipment of a gas generator set, in particular to a control device for an emergency shut-off valve. Background Art

[0002] Gas-fired generator sets generate electricity by burning natural gas, which makes them cleaner and more environmentally friendly than coal-fired generators. Gas-fired generator sets require a natural gas supply, which must be maintained during normal operation. However, the natural gas supply must be promptly cut off when the generator requires maintenance or emergency shutdown.

[0003] In addition, in order for the unit to operate normally, the gas supply pressure of the supplied natural gas must also be guaranteed, otherwise the unit may trip and cause an unplanned shutdown. Not only will the life of the unit be shortened, but restarting the unit will also increase the burden on the company and reduce the economic benefits of the unit. Summary of the Invention

[0004] In response to the shortcomings of the prior art, the present invention provides a control device for an emergency shut-off valve that can supply or cut off natural gas to a unit and implements dual redundant control, greatly improving the operational safety of the unit. To achieve the above technical objectives, the present invention adopts the following technical solutions:

[0005] The embodiment of the utility model provides a control device for an emergency shut-off valve, comprising a first solenoid valve YV1, a bypass valve V3, a three-way valve V4, and a control cylinder V5;

[0006] The first solenoid valve YV1 is arranged on the first control branch, one end of the first control branch is connected to the control air source through the air inlet pipe, and the other end is connected to the first end of the three-way valve V4 through a pipeline;

[0007] The bypass valve V3 is arranged on the third control branch, one end of the third control branch is connected to the control air source through the air inlet pipe, and the other end is connected to the second end of the three-way valve V4 through a pipeline;

[0008] The third end of the three-way valve V4 is connected to the control cylinder V5 through a pipeline;

[0009] The control cylinder V5 is used to connect to the emergency shut-off valve V6.

[0010] Furthermore, the control device of the emergency shut-off valve also includes a second solenoid valve YV2, which is arranged on a second control branch. One end of the second control branch is connected to the control air source through an air intake pipe, and the other end is connected to the first end of the three-way valve V4 through a pipeline.

[0011] Furthermore, a first isolation ball valve V1 is provided on the side of the first solenoid valve YV1 facing the control air source on the first control branch, and a second isolation ball valve V2 is provided on the side of the second solenoid valve YV2 facing the control air source on the second control branch.

[0012] Furthermore, the first isolation ball valve V1 and the second isolation ball valve V2 are both manual valves.

[0013] Furthermore, the bypass valve V3 is a manual valve.

[0014] The beneficial effects of the technical solution provided by the embodiment of the present invention are as follows: the present invention adopts dual solenoid valves to realize dual redundant control, so that the gas supply pressure of the unit is stable, and the tripping of the unit due to insufficient or cut-off natural gas supply pressure can be avoided, which not only ensures the safe operation of the unit, but also ensures the economic benefits of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the control device in an embodiment of the present utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] like Figure 1 As shown, a control device for an emergency shut-off valve proposed in an embodiment of the present utility model includes a first solenoid valve YV1, a bypass valve V3, a three-way valve V4, and a control cylinder V5;

[0018] The first solenoid valve YV1 is arranged on the first control branch, one end of the first control branch is connected to the control air source through the air inlet pipe, and the other end is connected to the first end of the three-way valve V4 through a pipeline;

[0019] The bypass valve V3 is arranged on the third control branch, one end of the third control branch is connected to the control air source through the air inlet pipe, and the other end is connected to the second end of the three-way valve V4 through a pipeline;

[0020] The third end of the three-way valve V4 is connected to the control cylinder V5 through a pipeline;

[0021] The control cylinder V5 is used to connect the emergency shut-off valve V6;

[0022] The emergency shut-off valve V6 is installed on the gas supply main pipe; the bypass valve V3 is a manual valve. When automatic control is required, the bypass valve V3 is closed and controlled by the first solenoid valve YV1. When the first solenoid valve YV1 is turned on, the pressurized gas from the control gas source passes through the first solenoid valve YV1 and the first and third ends of the three-way valve V4 and enters the control cylinder V5. The control cylinder V5 is activated to turn on the emergency shut-off valve V6, and natural gas is delivered to the unit through the gas supply main pipe. The unit operates normally. When an abnormality occurs, an alarm is triggered, and the upper controller will de-energize and close the first solenoid valve YV1. The control cylinder V5 loses pressurized gas, and the emergency shut-off valve V6 is immediately closed.

[0023] When manual control is required, the first solenoid valve YV1 is closed and the bypass valve V3 is manually opened. The pressurized gas from the control gas source passes through the bypass valve V3 and the second and third ends of the three-way valve V4 and enters the control cylinder V5. The control cylinder V5 is activated to open the emergency shut-off valve V6. When an abnormality occurs, the bypass valve V3 needs to be manually cut off, thereby depriving the control cylinder V5 of pressurized gas and immediately closing the emergency shut-off valve V6.

[0024] After a long period of automatic control operation, the first solenoid valve YV1 may malfunction or have insufficient magnetic attraction, causing the control cylinder V5 to not operate properly. This can lead to insufficient or even cut-off natural gas supply pressure to the unit, causing the unit to trip. This situation is improved in the following preferred embodiment.

[0025] In one embodiment, the control device of the emergency shut-off valve further includes a second solenoid valve YV2, which is arranged on a second control branch. One end of the second control branch is connected to a control air source through an air inlet pipe, and the other end is connected to a first end of the three-way valve V4 through a pipeline.

[0026] The control principle of the second solenoid valve YV2 is the same as that of the first solenoid valve YV1. Through dual-redundant control of dual solenoid valves, when the unit is running, the first solenoid valve YV1 and the second solenoid valve YV2 are both energized and connected, which can fully ensure that the control cylinder V5 safely and reliably controls the emergency shut-off valve V6 to be connected, greatly improving the safety of unit operation.

[0027] In order to achieve alternating maintenance of the first solenoid valve YV1 and the second solenoid valve YV2, a first isolation ball valve V1 is provided on the side of the first solenoid valve YV1 facing the control air source on the first control branch, and a second isolation ball valve V2 is provided on the side of the second solenoid valve YV2 facing the control air source on the second control branch.

[0028] The first isolation ball valve V1 and the second isolation ball valve V2 are both manual valves; when any one of the first solenoid valve YV1 and the second solenoid valve YV2 needs to be repaired or replaced, the corresponding isolation ball valve can be cut off, and the pressure gas of the control gas source will not flow into the corresponding solenoid valve.

[0029] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit 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 control device for an emergency shut-off valve, characterized in that: It includes the first solenoid valve YV1, the bypass valve V3, the three-way valve V4, and the control cylinder V5; The first solenoid valve YV1 is arranged on the first control branch, one end of the first control branch is connected to the control air source through the air inlet pipe, and the other end is connected to the first end of the three-way valve V4 through a pipeline; The bypass valve V3 is arranged on the third control branch, one end of the third control branch is connected to the control air source through the air inlet pipe, and the other end is connected to the second end of the three-way valve V4 through a pipeline; The third end of the three-way valve V4 is connected to the control cylinder V5 through a pipeline; The control cylinder V5 is used to connect to the emergency shut-off valve V6.

2. The control device for the emergency shut-off valve according to claim 1, characterized in that: The control device of the emergency shut-off valve also includes a second solenoid valve YV2, which is arranged on a second control branch. One end of the second control branch is connected to the control air source through an air inlet pipe, and the other end is connected to the first end of the three-way valve V4 through a pipeline.

3. The control device for the emergency shut-off valve according to claim 2, characterized in that: A first isolation ball valve V1 is provided on the side of the first solenoid valve YV1 facing the control air source on the first control branch, and a second isolation ball valve V2 is provided on the side of the second solenoid valve YV2 facing the control air source on the second control branch.

4. The control device for the emergency shut-off valve according to claim 3, wherein: The first isolation ball valve V1 and the second isolation ball valve V2 are both manual valves.

5. The control device for the emergency shutoff valve according to any one of claims 1 to 4, characterized in that: The bypass valve V3 is a manual valve.

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