Electromagnetic valve assembly for check valve device, check valve system and steam turbine

Abstract

The utility model relates to an electromagnetic valve assembly for a check valve device, a check valve system and a steam turbine. The check valve device comprises an air cylinder, a check valve connected to the driving end of the air cylinder and an air inlet pipe communicating with the air cylinder. The electromagnetic valve assembly comprises an electromagnetic valve and an atomized lubricator, the electromagnetic valve is arranged on the air inlet pipe and used for controlling the air flow and on-off of the air inlet pipe, and the atomized lubricator is arranged on the air inlet pipe and located on the side, away from the air cylinder, of the electromagnetic valve so that air in the air inlet pipe can convey oil mist into the electromagnetic valve and the air cylinder through the atomized lubricator. According to the technical scheme, the electromagnetic valve and mechanical parts in the air cylinder can be lubricated and maintained through the atomized lubricator, the service life is prolonged, the situation that the closing time of the check valve is delayed due to aging of the parts is avoided, and safety and reliability are higher.

Description

Technical Field

[0001] The present disclosure relates to the technical field of steam turbine equipment, and in particular to a solenoid valve assembly for a check valve device, a check valve system and a steam turbine. Background Art

[0002] The check valve of the steam turbine is used to prevent the turbine from overspeeding and water ingress when the turbine is shut down. Normally, the opening or closing of the check valve is achieved by a cylinder. When the cylinder is in working condition, the internal spring is in a compressed state due to the pressure of the air pressure. At this time, the check valve is opened. When the steam turbine is shut down, the gas in the cylinder needs to be discharged so that the spring can return to the stretched state and the check valve is closed.

[0003] If the check valve is closed for too long, steam or water may flow back into the cylinder, causing accidents such as turbine overspeed or water shock, posing a safety hazard.

[0004] In the related art, the cylinder usually includes a piston rod, and the movement of the piston rod drives the valve of the check valve to open or close. However, long-term lifting and lowering of the piston rod can easily cause wear of the rod body, affecting the closing time of the check valve. Utility Model Content

[0005] The purpose of the present disclosure is to provide a solenoid valve assembly for a check valve device, a check valve system and a steam turbine, wherein the solenoid valve assembly can realize functions such as cylinder lubrication to at least partially solve the above technical problems.

[0006] In order to achieve the above object, according to a first aspect of the present disclosure, a solenoid valve assembly for a check valve device is provided, wherein the check valve device comprises a cylinder, a check valve connected to a driving end of the cylinder, and an intake pipe connected to the cylinder, and the solenoid valve assembly comprises:

[0007] a solenoid valve, disposed on the air intake pipe; and

[0008] The oil mist device is arranged in the air intake pipe and is located at a side of the solenoid valve away from the cylinder, so that the gas in the air intake pipe can pass through the oil mist device and deliver oil mist to the solenoid valve and the cylinder.

[0009] Optionally, the solenoid valve assembly further comprises a pressure reducing valve arranged on the air intake pipe, and the pressure reducing valve is located on a side of the oil mist collector away from the solenoid valve.

[0010] Optionally, the solenoid valve assembly includes a filter, which is arranged on the air intake pipe and located on a side of the pressure reducing valve away from the oil mist collector.

[0011] A second aspect of the present disclosure provides a check valve system, comprising a check valve device and a solenoid valve assembly as described in any of the above optional solutions.

[0012] Optionally, the check valve system further comprises an exhaust assembly disposed on the intake pipe between the cylinder and the solenoid valve assembly.

[0013] Optionally, the exhaust assembly includes an exhaust valve having an exhaust port.

[0014] Optionally, the exhaust valve is a one-way air-controlled valve.

[0015] Optionally, the check valve system further comprises a manual valve, which is arranged on the air intake pipe and close to the air intake end of the air intake pipe, so as to control the on-off of the air intake pipe.

[0016] Optionally, the length of the air inlet pipe is less than or equal to 1 m.

[0017] A third aspect of the present disclosure provides a steam turbine, comprising the check valve device described in any of the above optional schemes.

[0018] Through the above technical solution, an oil mist device is arranged on the air intake pipe, so that the gas in the air intake pipe can drive the oil mist sprayed by the oil mist device to enter the solenoid valve and the cylinder to achieve lubrication of the mechanical parts inside the solenoid valve and the cylinder. Therefore, the solenoid valve assembly provided by the present disclosure can lubricate the solenoid valve and the cylinder to extend the service life of the solenoid valve and the cylinder, ensure the normal operation of the solenoid valve body and the cylinder, and avoid the situation where the check valve cannot be closed in time due to aging of parts, etc., which is safer and more reliable.

[0019] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the check valve device provided in the exemplary embodiment of the present disclosure.

[0022] Description of Reference Numerals

[0023] 1. Solenoid valve assembly; 110. Solenoid valve; 120. Oil mist collector; 130. Pressure reducing valve; 140. Filter; 2. Cylinder; 210. Spring; 220. Piston rod; 3. Check valve; 4. Exhaust assembly; 410. Exhaust port; 5. Manual valve; 6. Inlet pipe. DETAILED DESCRIPTION

[0024] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0025] In the present disclosure, unless otherwise specified, "inside and outside" refer to the inside and outside of the corresponding component outline. In addition, when the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise specified.

[0026] according to Figure 1 As shown, in the first aspect of the present disclosure, a solenoid valve assembly for a check valve device is provided. The check valve device may include a cylinder 2, a check valve 3 connected to the driving end of the cylinder 2, and an intake pipe 6 connected to the cylinder 2. It should be noted that, regarding the specific structure of the check valve 3, those skilled in the art may refer to existing relevant literature, and the present disclosure will not repeat them here; the solenoid valve assembly 1 may include a solenoid valve 110 and an oil mist collector 120. The solenoid valve 110 is arranged on the intake pipe 6 to control the gas flow in the intake pipe 6 and the intake pipe 6. The oil mist collector 120 is connected to the air intake pipe 6 and is located on the side of the solenoid valve 110 away from the cylinder 2, so that the gas in the air intake pipe 6 can be transported to the solenoid valve 110 and the cylinder 2 through the oil mist collector 120. The oil mist can lubricate the mechanical parts in the solenoid valve 110 and the cylinder 2 to extend their service life. For example, it can lubricate the piston in the cylinder 2.

[0027] Through the above technical scheme, the provision of the oil mist collector 120 can effectively avoid the problem of prolonged closing time of the check valve 3 due to aging and rusting of the mechanical parts inside the solenoid valve 110 and the cylinder 2, thereby increasing the service life of the solenoid valve 110 and the cylinder 2. At the same time, it reduces the probability of safety accidents such as turbine overspeed or water hammer caused by untimely closing of the check valve 3, thereby effectively improving safety and reliability.

[0028] The number of the solenoid valves 110 can be adaptively adjusted according to actual conditions. For example, there can be two solenoid valves 110 , one of which can control the flow of gas and the other can control the on-off of gas. The present disclosure is not limited thereto.

[0029] In actual work, the gas input by the air inlet pipe 6 is usually a compressed gas source. In order to facilitate the adjustment of the pressure of the compressed gas source, in some practicable ways, for example, reference Figure 1As shown, the solenoid valve assembly 1 may further include a pressure reducing valve 130 disposed on the intake pipe 6. The pressure reducing valve 130 is located on the side of the oil mist collector 120 away from the solenoid valve 110, so that the compressed air source in the intake pipe 6 can be safely delivered to the cylinder 2 after being pressure-regulated by the pressure reducing valve 130, which is more reliable.

[0030] In order to prevent waste materials such as rust from being mixed into the gas inputted from the intake pipe 6, in some practicable ways, for example, referring to Figure 1 As shown, the solenoid valve assembly 1 may further include a filter 140, which is disposed on the intake pipe 6 and is located on the side of the pressure reducing valve 130 away from the oil mist collector 120, so that the gas input from the intake pipe 6 is first filtered by the filter 140, and then passes through the pressure reducing valve 130, the oil mist collector 120, and the solenoid valve 110 in sequence, and finally enters the cylinder 2, so as to prevent waste materials such as rust from clogging or corroding the above-mentioned devices.

[0031] In the related art, when the steam turbine is shut down and the cylinder 2 needs to be exhausted, the compressed gas source in the cylinder 2 chamber needs to return to the solenoid valve 110 and be exhausted through the exhaust port of the solenoid valve 110. The length of the intake pipe 6 is usually 6 meters, which results in an exhaust time of about 7 seconds, making it impossible to close the valve of the check valve 3 in a shorter time.

[0032] To this end, the second aspect of the present disclosure provides a check valve system, including a check valve device, the check valve device including a cylinder 2, a check valve 3 connected to the driving end of the cylinder 2, an intake pipe 6 connected to the cylinder 2, and the solenoid valve assembly 1 of the above-mentioned embodiment, the solenoid valve assembly 1 having all the beneficial effects of the above-mentioned specific embodiments.

[0033] Here is a brief description of the working principle of the check valve device: a spring 210 is arranged inside the cylinder 2, and the spring 210 is connected to the piston rod 220. The end of the piston rod 220 facing away from the spring 210 is connected to the valve of the check valve 3. When the steam turbine is working, the gas in the intake pipe 6 enters the cylinder 2, and the gas compresses the spring 210, and the check valve 3 is in the open state; when the steam turbine is shut down, the solenoid valve 110 receives the system signal to cut off the intake pipe, and the gas in the cylinder 2 cavity is quickly discharged through the exhaust component 4, the spring 210 returns to the stretched state, and the check valve 3 is closed.

[0034] In some practicable embodiments, the check valve device may further include an exhaust assembly 4 disposed between the cylinder 2 and the solenoid valve assembly 1, so that the gas in the cylinder 2 cavity does not need to return to the solenoid valve 110 for exhaust, thereby shortening the exhaust time.

[0035] Of course, in order to further shorten the exhaust time, the length of the intake pipe 6 can be less than or equal to 1m. For example, the length of the intake pipe 6 can be 1m. By shortening the distance, the gas in the cylinder 2 cavity can be discharged faster and the exhaust time can be shortened.

[0036] Optionally, the exhaust assembly 4 may include an exhaust valve having an exhaust port 410. For example, the exhaust valve may be a one-way gas-controlled valve to prevent incomplete gas exhaust due to part of the gas in the cylinder 2 flowing into the solenoid valve assembly 1 when the gas is discharged through the exhaust valve.

[0037] The limitation on the types of exhaust valves in the present disclosure is only for the purpose of the present disclosure. The exhaust valve may also use an ordinary air-controlled valve or a manual valve. The present disclosure does not make specific limitations on this, and those skilled in the art may make adaptive adjustments based on actual needs.

[0038] In order to facilitate the maintenance of the solenoid valve assembly 1, in some practicable ways, for example, referring to Figure 1 As shown, the check valve device can also include a manual valve 5, which is arranged on the air intake pipe 6 and close to the air intake end of the air intake pipe 6 to control the on-off of the air intake pipe 6. When encountering an emergency, the staff can close the air intake pipe 6 through the manual valve 5 and repair the relevant equipment.

[0039] A third aspect of the present disclosure provides a steam turbine, comprising a check valve device of the above embodiment. The check valve device has all the beneficial effects of the above specific embodiments, which will not be described in detail in the present disclosure.

[0040] The following is a comparison of the exhaust time between the specific embodiment of the technical solution of the present disclosure and the specific embodiment of the technical solution of the traditional check valve device:

[0041] Inspection method: Use DQ941D circuit breaker tester to test the closing time of the check valve device disclosed in the present invention and the traditional check valve device, a total of 26 check valve devices.

[0042]

[0043] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, the technical solution of the present disclosure can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present disclosure. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0044] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A solenoid valve assembly for a check valve device, the check valve device comprising a cylinder, a check valve connected to a driving end of the cylinder, and an intake pipe connected to the cylinder, characterized in that: The solenoid valve assembly comprises: a solenoid valve, disposed on the air intake pipe; and The oil mist device is arranged on the intake pipe and is located on the side of the solenoid valve away from the cylinder, so that the gas in the intake pipe can convey oil mist to the solenoid valve and the cylinder through the oil mist device.

2. The solenoid valve assembly for a check valve device according to claim 1, characterized in that: The solenoid valve assembly further comprises a pressure reducing valve arranged on the air intake pipe, wherein the pressure reducing valve is located at a side of the oil mist collector away from the solenoid valve.

3. The solenoid valve assembly for a check valve device according to claim 2, characterized in that: The solenoid valve assembly comprises a filter, which is arranged on the air intake pipe and located at a side of the pressure reducing valve away from the oil mist collector.

4. A check valve system, characterized in that: It comprises a check valve device and a solenoid valve assembly as described in any one of claims 1 to 3.

5. The check valve system according to claim 4, characterized in that: The check valve system further comprises an exhaust assembly disposed on the air intake pipe between the cylinder and the solenoid valve assembly.

6. The check valve system according to claim 5, characterized in that: The exhaust assembly includes an exhaust valve having an exhaust port.

7. The check valve system according to claim 6, characterized in that: The exhaust valve is a one-way air-controlled valve.

8. The check valve system according to claim 4, characterized in that: The check valve system further comprises a manual valve, which is arranged on the air intake pipe and close to the air intake end of the air intake pipe, so as to control the on-off of the air intake pipe.

9. The check valve system according to claim 4, characterized in that: The length of the air intake pipe is less than or equal to 1 m.

10. A steam turbine, characterized in that: A check valve system comprising any one of claims 4 to 9.

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