RU54130U1 - PULSE-SAFETY DEVICE - Google Patents

Abstract

The proposed utility model relates to mechanical engineering, in particular to valve manufacturing, and may find application in nuclear energy and other industries. What is new in the utility model is that in the pulse safety device, the pulse valve position sensor is mounted under the pulse valve electromagnet, moreover, its lever is directly connected to the pulse valve stem, the housing of the pulse valve position sensor is structurally designed as a supporting part and contains a flange onto which installed solenoid valve pulse. As an achievement of the technical result, it should be indicated that the device achieves a reduction in repair time and an improvement in operating conditions.

Description

The proposed utility model relates to mechanical engineering, in particular to valve manufacturing, and may find application in nuclear energy and other industries.

The subject of this review is pulse-safety devices (ISD) with an additional control line (DLU) designed to protect the primary circuit of nuclear power plants with VVER-type reactor installations (RPs) by automatically relieving the pressure of the working medium from the pressure compensator (CD) to a bubbler in violation of normal conditions work during design basis accidents and the implementation of the “feed and bleed” procedure in the conditions of beyond design basis accidents. IPU is a block design consisting of a main valve (GK) with a piston actuator, two pulse (IR) and one shut-off (OK) valves with electromagnetic actuators, a control valve and an additional control line supplied in

as a separate unit connected to the IPU CC by a pipeline. The DLU is designed to control the ISP in the conditions of a beyond design basis accident in order to mitigate its consequences by forcibly opening the ISP GC and lowering the pressure in the primary circuit to below 0.98 MPa. Thus, the DLU ensures the implementation of the procedure "feed and bleed" no international standards. In addition, an additional control line can be used for routine checks of the operation of the ISP when the reactor is stopped

Among devices of this kind, the valve described in A.S. is known. USSR No. 1672065, MKI F 16 K 1/46. It contains a housing with a saddle and a locking member with a shank, on which a sealing assembly is installed with a radial clearance ensuring its free movement, and an annular protrusion with channels communicating the under-valve and under-valve cavities when the locking member is open is mounted on the shank of the locking member of the coaxial sealing assembly while the total passage section of the channels is equal to the conditional passage of the valve.

A device is known by A.S. USSR No. 1624225, F 16 K 17/02. The safety valve with a bellows seal contains a housing with an outlet and inlet nozzles, a spring-loaded stem with a shut-off element, and a cap in which the piston is located. If there is a working pressure in the inlet pipe and back pressure in the outlet pipe in

cavities under the action of back pressure creates a force on the piston. It acts on the stem down through the spring and compensates for the buoyancy force along the bellows and up the stem.

The pulse-safety device UV 50024-100 produced by the industry is also known. It is the closest in technical essence to the proposed utility model and is taken as a prototype. This device contains a main valve, pulse valves and a tuning valve with installed position sensors GK, IK, OK, consisting of a lever with a magnet and a signaling device with contacts, a shut-off valve, an additional control line. This device provides operation in the conditions of protection of the primary circuit of an NPP by automatically depressurizing the working medium. However, in designs of this type, the position sensor of the pulse valve was located on an electromagnet. This required laborious operations to reconfigure the pulse valve position sensor in the event of an electromagnet replacement or repair work. This increased the repair time in the hermetic zone of the switchgear and complicated the operating conditions of the equipment.

Thus, in this device, a technical result is not achieved, expressed in reducing repair time and improving operating conditions. The specified technical result is achieved by the fact that in a known device containing GK, IR and tuning valve (KN) with

installed by the GK position sensor, an IR position sensor, consisting of a lever with a magnet and a signaling device with contacts, a shut-off valve, an additional control line, an IR position sensor installed under the IR electromagnet, and its lever is directly connected to the IR rod, and the housing of the IR position sensor contains a flange on which an IR electromagnet is mounted. This design provides reliable information about the position of the IR locking element and allows quick replacement of electromagnets.

In the search process for sources of scientific, technical and patent information, no devices of a similar purpose were found that possess the claimed combination of features with the indicated positive effect. Thus, the proposed utility model, according to the applicant, is a technical solution to the problem, which is new and industrially applicable.

Figure 1 shows a General view of the device according to the proposed utility model.

Figure 2 shows the device position sensor pulse valve.

Pulse safety device (see figure 1) consists of a GK 1 connected to two IR 2, one of which is connected to the valve 3

settings. The sensor 4 of the position of IR 2 is connected to the rod of IR 2 and the electromagnet 7, the contacts of the sensor 4 are opened in accordance with the position of the rod. The sensor 5 is located on the GC 1 and is made using contacts and a lever. Sensor 6 is similar to the GK 5 sensor and is mounted on an OK electromagnet. The electromagnet 7 is installed on the position sensor 4 IR 2 and serves to trigger the GC 1 from the control panel. Electromagnet 8 is installed on the GC 1 and is designed to turn off the IK 2 when it fails, followed by landing of the GC spool in emergency situations. DLU 9 consists of a shut-off valve with an electromagnetic actuator (KEMZ) and a shut-off valve with an electric actuator (KZEP). A sensor 17 is installed on the KEMZ electromagnet, which is similar in design and purpose to sensor 6. DLU 9 is connected to the GC 1 and is designed to control the device in cases of beyond design basis accidents. A feature of the work in the composition of nuclear power plants is the location of the devices involved in their composition in the sealed zone of the RU, access to which is limited in time. In previous designs of this type, the sensor 4 IR 2 was located on the electromagnet 7. This required laborious operations to reconfigure the position sensor 4 in the event of replacement of the electromagnet 7 or repair work. In the proposed utility model, the sensor 4 is located under the electromagnet 7. In this regard, if it is necessary to replace or repair the electromagnet 7, there is no need to reconfigure the sensor 4, which reduces the repair time and

facilitates the operating conditions of equipment. Figure 2 shows the composition of the position sensor IR 2. There rod 10 IR 2 through the lever 11 of the sensor 4 is connected to the magnet 12 of the lever. The following is a signaling device 13 with a connector on which magnetically controlled contacts are mounted 14. A position sensor is located in the housing 15, on which a flange 16 of the solenoid 7 of IR 2 is fixed.

The device operates as follows. The medium with a working pressure Рр is supplied from the protected system to the inlet nozzle ГК and to the inlet nozzle of valve 3 for construction sites, through which the medium enters the pulse valve 2. Through the throttle openings of the spool and piston gaps ГК 1 and СК 2, the medium also enters the control cavity, providing the required sealing force in the shutter of ГК 1. The sealing force in the shutter of IK 2 is achieved due to the installation force of the spring (not shown in Fig.) and the holding force of the electromagnet 7. Normal (standard) operation of the IAP is assumed from the electron bends 4. In the mode of normal operating conditions of the switchgear (at the working pressure of the medium in the protected system), the ISU is in standby mode, in which:

- GK 1 is closed by the pressure of the medium;

- OK open, electromagnet (EM) 8 OK de-energized;

- both IR 2 are closed, a holding current flows in the closing winding of the EM 7 IR 2, providing additional force to press the spool of IR 2 to the saddle, the EM opening winding is de-energized;

- KH 3 is open, the working medium passes through the valve;

- KEMZ DLU is closed by means of medium pressure and spring, the opening winding of the EM is de-energized;

- KZEP is closed.

The design of the IPA provides triggering from EM 7 IR 2 at a pressure of at least 0.8 Rp and holding the IR in the open state to a pressure of 0.65 Pp. When the pressure in the system increases to the setpoint for opening the IR, the closing winding of the EM 7 is turned off by the control system and the opening winding of the EM 7 is turned on. The IR 2 opens, relieves the medium from the supra-piston cavity of GC 1. GC 1 opens and relieves the pressure in the system to the closing pressure. Wherein:

- the shut-off valve with an electromagnetic actuator (KEMZ) is closed;

- The shut-off valve with electric actuator (KZEP) is closed. After reducing the pressure in the system until the closing pressure is set, the opening winding of the EM 7 is turned off by the control system of the ISU and the closing winding of the EM 7 is turned on. The closing EM of the IK 2. IK 2 is closed, the medium fills the control cavity (nadporshnevaya) through the throttle holes and piston gaps 1 and it closes. When the pressure in the system decreases to the set value for closing OK (if the IR is not closed), the control system switches on the closing EM. The OK valve disconnects IK 2 from the supra-piston cavity ГК 1 and the pressure of the medium ГК 1 closes (if it was previously opened). When de-energizing EM OK, valve OK

disconnects and connects IR 2 to the supra-piston cavity of PS 1, which brings the ISP into a state of readiness for work.

Protection of the equipment of the primary circuit of the NPP from “cold re-pressuring” is ensured by the control of PS 1 ISP from an additional control line by opening and closing KEMZ and KZEP. When the power unit is operating at power, the system must be disconnected from the “cold re-pressuring” (KEMZ and KZEP valves are closed, open windings of EM KEMZ are de-energized). The system of protection against "cold re-pressing" in standby mode is switched on automatically during the period of heating or cooling of the power unit at a primary coolant temperature of less than (100 + 5) ° С. The system shuts down automatically during the warm-up period of the power unit when the specified temperature of the primary coolant is reached. KEMZ opens by supplying current to the EM opening winding, and closes when the EM is de-energized, by means of a spring. De-energizing the control system of the IPA and electromagnets 7 IR 2 IPU does not lead to the operation of the IPU. The IPA does not lose working capacity, since in this case the IR operates as a direct-acting safety valve. The presence in the design of the valve IPU 3 settings allows you to trigger the valve from an external pressure source without increasing the pressure in the system. The setting valve provides the ability to: check the settings of IR 2 and the operation of the ISP with a vapor pressure in the pressure compensator> 0.7 Rp from

extraneous pressure source; checking the settings of IR 2 from an external source of air or nitrogen pressure in the absence of pressure in the pressure compensator; washing, if necessary, the internal cavities of the IPA with distillate after staying in the IPA of the coolant with a high concentration of boron.

The design of the IPA provides the ability to adjust the response pressure within ± 7% of the operating pressure.

The sensor 4 of the position of IR 2 signals the position of the locking elements of the IR 2. The sensor 5 position of the HA signals the position of the locking element of the HA 1. The sensor 6 of the position OK signals the position of the locking element of OK. When the electromagnet is on, OK GK 1 is closed, the OK position sensor 6 signals that the IR 2 is disconnected from the GK 1. The KEMZ position 17 sensor signals the position of the KEMZ shut-off element.

As an example of a specific implementation, it should be said that this device is intended for use in nuclear power plants. The IPU remains operational at a heating and cooling rate of 150 ° C per hour. When voltage is applied to the electromagnets OK to close, and IR to open, the boost winding is turned on. After the signal on the movement of the locking elements, the holding winding is connected and the magnets are switched from the boost mode to the hold mode. In the event of a malfunction of the position signaling devices, the magnet switches from the boost mode to the hold mode by means of a relay

time after 5 sec. The IPA is equipped with a lever for checking the IR settings and checking the operability of the IPU with reduced environmental parameters in the pressure compensator.

Thus, as can be seen from the above, it is the presented set of essential features of the proposed utility model that allows you to get the claimed positive result, expressed in reducing repair time and improving operating conditions. In known devices for a similar purpose, the achievement of the specified technical result is not observed.

Claims (1)

A pulse safety device comprising a main valve, a shut-off valve, pulse valves, one of which is equipped with a tuning valve, an additional control line and position sensors of the main, shut-off, pulse valves and an electromagnetic valve position sensor of the additional control line, consisting of a lever with a magnet signaling device with contacts, characterized in that the position sensor of the pulse valve is installed under the electromagnet of the pulse valve, moreover, its lever directly with knitted with the stem of the pulse valve, and the housing contains a flange on which the pulse valve electromagnet is mounted.