Multifunctional purge valve special for nuclear power station diesel engine

Abstract

A multifunctional purge valve special for a nuclear power station diesel engine comprises a valve body with the cross section of a T-shaped structure, a valve element body moving up and down is installed in the valve body in a matched mode, three channels are formed in the valve body, and openings of the channels include an inlet A, an outlet B and a bypass opening C; the top faces of the valve element body and the valve body are provided with valve decks in a matched mode at the same time, and air inlet channels are formed in the middles of the valve decks. A groove is formed in the middle of the upper portion of the valve body, a sliding rail is installed on the inner wall face of the groove, a protruding structure matched with the sliding rail is arranged on the upper portion of the valve element body, a vent hole is further formed in the protruding structure, the vent hole is communicated with the inner space of the groove, and meanwhile the vent hole is communicated with the air inlet channel. The air channel is communicated with the vent hole; the bottom of the valve element body is connected with the valve body through the reset spring, the efficient blowing function can be effectively achieved, meanwhile, the good sealing performance and operation convenience are achieved, and use is flexible and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of purge valves, in particular to a multifunctional purge valve dedicated to diesel engines in nuclear power plants. Background Art

[0002] In the field of nuclear power, diesel engines, as an important backup power source, need to be able to start and stop quickly and accurately in emergency situations to ensure the safety of nuclear power plants and the general public. The diesel engine emergency shutdown system in the prior art often uses electrical control to cut off the fuel supply, but in some extreme cases, the electrical system may fail or be untimely, and the emergency shutdown protection of the diesel engine cannot be effectively achieved, causing fatal damage to the diesel engine. For example, if the diesel engine is speeding, it will cause significant economic losses. Utility Model Content

[0003] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a multifunctional purge valve dedicated to nuclear power plant diesel engines, which can effectively realize an efficient purge function while having good sealing performance and operational convenience, and is flexible and convenient to use.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A multifunctional purge valve for nuclear power plant diesel engines, comprising a valve body with a "T"-shaped cross section, a valve core body that moves up and down is installed in cooperation with the inside of the valve body, the valve core body is connected to a driving structure, a horizontal hole is opened in the middle of the valve core body, three channels are arranged inside the valve body, each channel opening is an inlet A, an outlet B and a bypass port C, the inlet A and the outlet B are located at the same horizontal position and are aligned with the horizontal hole at the same time; a valve cover is installed in cooperation with the top surface of the valve core body and the valve body, and an air intake hole is arranged in the middle of the valve cover , and an air inlet channel is formed, and the air inlet is a Q interface; a groove is arranged in the middle of the upper part of the valve body, a slide rail is installed on the inner wall of the groove, a protrusion structure cooperating with the slide rail is arranged on the upper part of the valve core body, and a vent is also arranged at the protrusion structure, the vent is connected with the internal space of the groove, and the vent is also connected with the air inlet channel, an air path channel is arranged in the middle of the upper part of the valve core body, the air path channel is connected with the vent, and a balancing hole is arranged on the valve core body below the air path channel; the bottom of the valve core body is connected with the valve body through a reset spring.

[0006] As a further improvement of the above technical solution:

[0007] The driving structure is pneumatic or manual.

[0008] The valve cover is sealed and locked with the valve body by fastening nuts, bolts and O-rings.

[0009] The diameter of the balancing hole is 2mm-5mm.

[0010] The diameters of the inlet A, outlet B and the communicating hole are the same.

[0011] The top surface of the valve core body is provided with a spherical surface, and the bottom surface of the valve cover is provided with a concave structure corresponding to the spherical surface, and the spherical surface and the concave structure cooperate with each other.

[0012] A screw plug is arranged on the upper part of the gas passage.

[0013] The beneficial effects of the utility model are as follows:

[0014] The utility model has a compact and reasonable structure and is easy to operate. It directly cuts off the fuel supply of the diesel engine by physical means and uses compressed air to purge the residual fuel in the diesel engine pipeline, thus realizing a quick and reliable shutdown of the diesel engine. In the event of failure of the electrical protection system or other emergency situations, the device can effectively protect the diesel engine from damage and improve the safety and reliability of nuclear power diesel engines.

[0015] The utility model also has the following advantages:

[0016] (1) The design of the gas path of the utility model can facilitate the connection of the gas path and ensure smooth air flow.

[0017] (2) The design of the slide rail of the utility model allows the valve core body to move up and down stably.

[0018] (3) The spherical design of the utility model can ensure a reliable connection between the valve core body and the valve cover and form a spherical seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 for Figure 1 A partial enlarged view of section D in the middle.

[0021] Figure 3 It is a schematic diagram of fluid flow of the utility model.

[0022] Among them: 1. Fastening nut; 2. Valve cover; 3. Bolt; 4. O-ring; 5. Screw plug; 6. Valve body; 7. Valve core body; 8. Return spring; 9. Air channel; 10. Balance hole; 11. Slide rail; 12. Spherical surface. DETAILED DESCRIPTION

[0023] The specific implementation of the utility model is described below in conjunction with the accompanying drawings.

[0024] like Figure 1-Figure 3As shown, the multifunctional purge valve for nuclear power plant diesel engines of this embodiment includes a valve body 6 with a "T"-shaped cross-section, a valve core body 7 that moves up and down is installed in the interior of the valve body 6, the valve core body 7 is connected to the driving structure, a horizontal hole is opened in the middle of the valve core body 7, three channels are arranged inside the valve body 6, and each channel opening is an inlet A, an outlet B and a bypass port C, respectively, the inlet A and the outlet B are located at the same horizontal position and are aligned with the horizontal hole at the same time; the valve core body 7 and the top surface of the valve body 6 are simultaneously installed with a valve cover 2, and the middle of the valve cover 2 is provided with an air intake hole , and form an air inlet channel, the air inlet is a Q interface; a groove is provided in the middle position of the upper part of the valve body 6, and a slide rail 11 is installed on the inner wall surface of the groove, and a convex structure cooperating with the slide rail 11 is provided on the upper part of the valve core body 7, and a vent is also provided at the convex structure, the vent is connected with the internal space of the groove, and the vent is also connected with the air inlet channel, an air path channel 9 is provided in the middle of the upper part of the valve core body 7, the air path channel 9 is connected with the vent, and a balancing hole 10 is provided on the valve core body 7 below the air path channel 9; the bottom of the valve core body 7 is connected to the valve body 6 through a reset spring 8.

[0025] The driving structure adopts pneumatic or manual.

[0026] The valve cover 2 is sealed and locked with the valve body 6 by fastening nuts 1, bolts 3 and O-rings 4.

[0027] The diameter of the balancing hole 10 is 2 mm-5 mm.

[0028] The diameters of the inlet A, outlet B and the communication hole are the same.

[0029] The top surface of the valve core body 7 is provided with a spherical surface 12 , and the bottom surface of the valve cover 2 is provided with a concave structure corresponding to the spherical surface 12 , and the spherical surface 12 and the concave structure cooperate with each other.

[0030] A screw plug 5 is provided on the upper portion of the gas passage 9 .

[0031] The balancing hole 10 of the utility model can quickly discharge the remaining air on the compressed air channel side and quickly reset the valve core during the recovery stage.

[0032] When inlet A and outlet B are connected, the main channel is connected and works, inlet A is connected to the diesel engine oil inlet, and outlet B is connected to the external oil supply pipe.

[0033] The driving structure adopts pneumatic or manual, which can be suitable for different application scenarios.

[0034] The design of the reset spring 8 allows automatic recovery after each purge without requiring any extra reset action.

[0035] In normal working mode, the valve core body 7 accurately conducts the main circuit channel to ensure the normal delivery of the fluid;

[0036] In abnormal operating mode, the valve enters the purge mode; compressed air enters from the Q interface, and under the action of the pressure difference between the fuel and the compressed air, the valve core body 7 is pushed to move, so that the inlet A is connected with the bypass port C, ensuring that the fuel in the inlet channel can be discharged through the bypass channel, so that the fuel in the inlet channel will not be suffocated and the pressure will not increase sharply, damaging the diesel engine drive fuel pump; at the same time, effective purging of the outlet B is achieved, and the air entering from the Q port will purge the fuel of the diesel engine fuel supply system back to the fuel tank, quickly determining the fuel supply from a fundamental physical level, and ensuring the safe shutdown of the diesel engine.

[0037] Specifically caused by Figure 3 As shown, the three-way purge valve described in the utility model is used in special diesel engine fuel system occasions and is fixed on the diesel engine body. The inlet A is connected to the external fuel system interface, the outlet B is connected to the diesel engine body fuel system supply inlet, and the bypass C port is connected to the diesel engine fuel outlet, and the air interface Q is connected to the compressed air of the quick on-off solenoid valve.

[0038] The unique design of the utility model combines innovation and practicality, and can achieve precise airflow control and efficient purge function.

[0039] The utility model is cleverly laid out so that the valve can flexibly guide the direction of the airflow when working. The purge valve has a simple structure and very high reliability. It can still operate stably in harsh working environments to ensure the smooth progress of the production process. Its solid structure and excellent performance provide a solid guarantee for the reliable operation of nuclear power diesel engines.

[0040] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the protection scope of the utility model.

Claims

1. A multifunctional purge valve for nuclear power plant diesel engines, characterized by: The invention comprises a valve body (6) with a "T"-shaped cross section, a valve core body (7) which moves up and down is installed in cooperation with the inside of the valve body (6), the valve core body (7) is connected to a driving structure, a horizontal hole is opened in the middle of the valve core body (7), three channels are arranged in the inside of the valve body (6), and the openings of each channel are an inlet A, an outlet B and a bypass port C, respectively, the inlet A and the outlet B are located at the same horizontal position and are aligned with the horizontal hole at the same time; a valve cover (2) is installed in cooperation with the top surface of the valve core body (7) and the valve body (6), an air intake hole is arranged in the middle of the valve cover (2), and an air intake channel is formed, and the air intake port is connected to Q A groove is provided in the middle of the upper part of the valve body (6), and a slide rail (11) is installed on the inner wall surface of the groove. A protrusion structure cooperating with the slide rail (11) is provided on the upper part of the valve core body (7), and a vent is also provided at the protrusion structure. The vent is connected to the inner space of the groove, and the vent is also connected to the air inlet channel. An air passage (9) is provided in the middle of the upper part of the valve core body (7), and the air passage (9) is connected to the vent. A balancing hole (10) is provided on the valve core body (7) below the air passage (9); the bottom of the valve core body (7) is connected to the valve body (6) via a reset spring (8).

2. A multifunctional purge valve for nuclear power plant diesel engines as claimed in claim 1, characterized in that: The driving structure is pneumatic or manual.

3. A multifunctional purge valve for nuclear power plant diesel engines as claimed in claim 1, characterized in that: The valve cover (2) is sealed and locked with the valve body (6) by means of a fastening nut (1), a bolt (3) and an O-ring (4).

4. A multifunctional purge valve for nuclear power plant diesel engines as claimed in claim 1, characterized in that: The diameter of the balancing hole (10) is 2 mm-5 mm.

5. A multifunctional purge valve for nuclear power plant diesel engines as claimed in claim 1, characterized in that: The diameters of the inlet A, outlet B and the communicating hole are the same.

6. A multifunctional purge valve for nuclear power plant diesel engines as claimed in claim 1, characterized in that: The top surface of the valve core body (7) is provided with a spherical surface (12), and the bottom surface of the valve cover (2) is provided with a concave structure corresponding to the spherical surface (12), and the spherical surface (12) and the concave structure cooperate with each other.

7. A multifunctional purge valve for nuclear power plant diesel engines as claimed in claim 1, characterized in that: A screw plug (5) is provided on the upper portion of the gas passage (9).

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