CN218094561U

CN218094561U - Novel cartridge valve and cartridge valve type speed regulating system

Info

Publication number: CN218094561U
Application number: CN202222334875.8U
Authority: CN
Inventors: 周峰峰; 吴定平; 王庆书; 周伍; 杨琪; 孙晓璞
Original assignee: China Yangtze Power Co Ltd
Current assignee: China Yangtze Power Co Ltd
Priority date: 2022-09-02
Filing date: 2022-09-02
Publication date: 2022-12-20
Anticipated expiration: 2032-09-02

Abstract

The utility model provides a novel cartridge valve and cartridge valve formula speed governing system, includes case, bush, apron, adjusting screw, the gliding installation of case is in the bush, and the end opening part at the bush is installed to the apron, and the apron is in the same place through the bolt of symmetry and the basis of bush, and adjusting screw installs the middle part at the apron, be equipped with control circuit in the apron, the bush is equipped with main oil circuit import and main oil circuit export, lets in pressure oil in the control circuit and makes the case remove to the switching of control main oil circuit import and main oil circuit export, gliding installation of apron has the valve piece, and the valve piece passes through the connecting rod to be connected with the case, the area of valve piece round end face is greater than the area of case round end face. By additionally arranging the valve block with larger area, the main oil path inlet and the main oil path outlet of the cartridge valve can be sealed only by smaller control oil path pressure.

Description

Novel cartridge valve and cartridge valve type speed regulating system

Technical Field

The utility model relates to a hydraulic turbine speed control system technical field especially relates to a novel cartridge valve and cartridge valve formula speed control system.

Background

The water turbine speed regulating system is an important component device of the water turbine generator set, and is matched with a computer monitoring system to complete the tasks of starting, stopping, increasing and decreasing loads, emergency stopping and the like of the water turbine generator set, and the speed regulating system with a main pressure distributing valve and an accident pressure distributing valve which are all cartridge valve type is successfully applied to the water turbine generator sets of 150MW and 170MW in sequence.

The cartridge valve type accident distribution valve adopts 4 cartridge valves as oil flow channels and respectively controls an oil supply pipe (accident oil source) of the accident distribution valve, an oil return pipe of the accident distribution valve, an opening oil pipe of a main distribution valve and a closing oil pipe of the main distribution valve. According to the oil consumption of the guide vane servomotor of the unit, 4 cartridge valves with the same specification are generally selected, so that the performance requirements of the speed regulating system are met, and the field layout is facilitated.

According to different power station designs, if under the condition that two units share 1 accident oil tank, 1 unit main oil source pressure leads to accident distributing valve (4 cartridge valves constitute accident distributing valve) can not normally act when low oil pressure pilot valve action critical point or pilot valve card are in the intermediate position, its 4 cartridge valves probably are in the open mode simultaneously, under the effect of accident oil source, the cartridge valve of main distributing valve is opened unusually, will cause accident oil source to a large amount of oil scurrings of this unit, finally lead to this unit turbine oil to leak and another unit low oil pressure accident to shut down.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the problem of exist among the above-mentioned background art is solved, a novel cartridge valve is provided, through addding the bigger valve block of area, only need littleer control oil circuit pressure just can seal the cartridge valve.

The utility model discloses another technical problem who solves is: the cartridge valve type speed regulating system adopting the novel cartridge valve is provided, and the potential safety hazard of misoperation of an accident pressure distributing valve is eliminated by changing the pressure area of a control oil way of the cartridge valve.

In order to realize the technical characteristics, the purpose of the utility model is realized as follows: the utility model provides a novel cartridge valve, includes case, bush, apron, adjusting screw, the gliding installation of case is in the bush, and the end opening part at the bush is installed to the apron, and adjusting screw installs the middle part at the apron, be equipped with control circuit in the apron, the bush is equipped with main oil circuit import and main oil circuit export, lets in pressure oil in the control circuit and makes the case remove to the switching of control main oil circuit import and main oil circuit export, gliding installation has the valve piece in the apron, and the valve piece passes through the connecting rod and is connected with the case, the area of valve piece round end face is greater than the area of case round end face.

A threaded hole is formed in the valve core, and an external thread is arranged at one end of the connecting rod and connected with the threaded hole of the valve core; the valve block is provided with a circular protruding part, the other end of the connecting rod is inserted into the protruding part, and the pin penetrates into the protruding part and the connecting rod in the radial direction.

The adjusting screw rod is slidably mounted on the cover plate, one end, close to the valve core, of the adjusting screw rod is connected with the valve block, the end, far away from the valve core, of the adjusting screw rod is provided with an adjusting ring, the spring is sleeved on the adjusting screw rod, and two ends of the spring are respectively abutted to the adjusting ring and the cover plate.

The adjusting screw rod is in threaded connection with the valve block and is in threaded connection with the adjusting ring.

The outside cover of spring and adjustable ring is equipped with the safety cover, and safety cover one end opening, the open end and the cover connection of safety cover.

A cartridge valve type speed regulating system comprises two novel cartridge valves, two conventional cartridge valves and a pilot valve; the two novel cartridge valves are in a normally open state, one of the two novel cartridge valves is connected to an oil path of a main distributing valve open cavity and a guide vane open cavity, and the other of the two novel cartridge valves is connected to an oil path of a main distributing valve closed cavity and a guide vane closed cavity; the two conventional cartridge valves are in a normally closed state, one of the two conventional cartridge valves is connected to an emergency oil source and a guide vane closed cavity oil path, and the other conventional cartridge valve is connected to an emergency pressure distribution valve oil return pipe and a guide vane open cavity oil path; and control oil paths of the two conventional cartridge valves and the two novel cartridge valves are connected and controlled with the pilot valve.

The utility model discloses there is following beneficial effect:

1. by additionally arranging the valve block with larger area, the area of the control cavity of the cartridge valve is increased, and compared with the conventional cartridge valve, the cartridge valve can be closed only by smaller pressure of the control cavity.

2. The oil delivery volume of the novel cartridge valve is unchanged, and the impact effect of pilot valve pressure reduction on a system caused by larger oil delivery volume is reduced.

3. The valve core and the valve block move leftwards through the elasticity of the spring, so that the cartridge valve keeps the inlet and the outlet of the main oil path in a normally open state when the cartridge valve is in an oil pressure-free state.

4. By rotating the adjusting ring, the pressure of the spring is adjusted.

5. The plug-in valve type speed regulating system can avoid the possible problems in the low oil pressure accident shutdown of the plug-in valve type speed regulating system unit, eliminate the potential safety hazard of the false operation of the plug-in valve type accident pressure distributing valve and improve the reliability of the unit safety barrier of the low oil pressure accident shutdown. The structure is simple and practical, and the unit which is installed can be directly improved without secondary piping and other characteristics.

6. Under the prerequisite that does not change original main equipment, can directly change conventional cartridge valve for the novel cartridge valve of increase control chamber area, two kinds of cartridge valves mutually support, have improved the reliability of accident distributing valve action.

Drawings

FIG. 1 is a schematic cross-sectional view of a conventional cartridge valve of the prior art.

Fig. 2 is the schematic sectional structure diagram of the novel cartridge valve of the present invention.

Fig. 3 is a schematic diagram of the structure of the cartridge valve type speed control system of the present invention.

In the figure: the valve core 1, the bush 2, the apron 3, adjusting screw 4, the valve piece 5, connecting rod 6, pin 7, safety cover 8, spring 9, adjustable ring 10, conventional cartridge valve 20, novel cartridge valve 30, pilot valve 40.

Detailed Description

The following describes embodiments of the present invention with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 1, the conventional cartridge valve comprises a valve core 1, a bushing 2, a cover plate 3 and an adjusting screw rod 4, wherein the valve core 1 is slidably mounted in the bushing 2, the cover plate 3 is mounted at an opening at the end of the bushing 2, the adjusting screw rod 4 is mounted in the middle of the cover plate 3, a control oil path is arranged in the cover plate 3, the bushing 2 is provided with a main oil path inlet and a main oil path outlet, and pressure oil is introduced into the control oil path to move the valve core 1, so that the opening and closing of the main oil path inlet and the main oil path outlet are controlled. The maximum opening of the valve core 1 is adjusted by rotating and adjusting the stroke of the adjusting screw rod 4, so that the maximum oil flow is adjusted.

Referring to fig. 2, a novel cartridge valve comprises a valve core 1, a bushing 2, a cover plate 3 and an adjusting screw rod 4, wherein the valve core 1 is slidably installed in the bushing 2, the cover plate 3 is installed at an end opening of the bushing 2, the cover plate 3 is combined with a foundation of the bushing 2 through symmetrical bolts, the adjusting screw rod 4 is installed at the middle of the cover plate 3, a control oil path is arranged in the cover plate 3, the bushing 2 is provided with a main oil path inlet and a main oil path outlet, pressure oil is introduced into the control oil path to move the valve core 1, so that the opening and closing of the main oil path inlet and the main oil path outlet are controlled, a valve block 5 is slidably installed in the cover plate 3, the valve block 5 is connected with the valve core 1 through a connecting rod 6, and the area of the round end face of the valve block 5 is larger than the area of the round end face of the valve core 1. By additionally arranging the valve block 5 with larger area, the main oil path inlet and the main oil path outlet of the cartridge valve can be sealed only by smaller control oil path pressure.

Referring to fig. 2, specifically, a threaded hole is formed in the valve core 1, and an external thread is formed at one end of the connecting rod 6 and connected with the threaded hole of the valve core 1; the valve block 5 is provided with a circular protruding part, the other end of the connecting rod 6 is inserted into the protruding part, and the pin 7 radially penetrates into the protruding part and the connecting rod 6, so that the valve core 1 and the valve block 5 are linked.

Referring to fig. 2, the adjusting screw 4 is slidably mounted on the cover plate 3, one end of the adjusting screw 4 close to the valve core 1 is connected with the valve block 5, one end far away from the valve core 1 is provided with an adjusting ring 10, the spring 9 is sleeved on the adjusting screw 4, and two ends of the spring 9 are respectively abutted to the adjusting ring 10 and the cover plate 3. Through setting up spring 9, specifically, spring 9 has the pressure spring, through the elasticity of spring 9, makes case 1 and valve block 5 remove to the left, makes the cartridge valve when there is not the oil pressure state, keeps main oil circuit import and main oil circuit export in normally open state.

Specifically, the adjusting screw rod 4 is in threaded connection with the valve block 5, and the adjusting screw rod 4 is in threaded connection with the adjusting ring 10. By rotating the adjusting ring 10, the pressure of the spring 9 is adjusted.

In order to protect the adjusting screw rod 4 and prevent the adjusting screw rod 4 from being deformed due to accidental collision and dust from polluting the adjusting screw rod 4, a protective cover 8 is sleeved outside the spring 9 and the adjusting ring 10, one end of the protective cover 8 is opened, and the opened end of the protective cover 8 is connected with the cover plate 3 to form a closed structure. The protective cap 8 is connected to the cover plate 3 by means of a screw thread.

Referring to fig. 3, a cartridge valve type speed control system comprises two novel cartridge valves 30 and two conventional cartridge valves 20, and a pilot valve 40; the two novel cartridge valves 30 are in a normally open state, one of the two novel cartridge valves is connected to an oil path of a main distributing valve open cavity and a guide vane open cavity, and the other one of the two novel cartridge valves is connected to an oil path of a main distributing valve closed cavity and a guide vane closed cavity; the two conventional cartridge valves 20 are in a normally closed state, one of the two conventional cartridge valves is connected to an emergency oil source and a guide vane closed cavity oil path, and the other conventional cartridge valve is connected to an emergency distributing valve oil return pipe and a guide vane open cavity oil path; the control circuit of the two conventional cartridges 20 and the two novel cartridges 30 are connected to the pilot valve 40 for control. The potential safety hazard of misoperation of the accident pressure distribution valve is eliminated by changing the pressure area of the cartridge valve control oil way.

The utility model discloses a working process and principle:

referring to fig. 3, when the unit main oil source is shut down due to a low oil pressure accident, a signal is transmitted to the pilot valve 40, and because a primary control valve (such as a low oil pressure control valve) on the pilot valve 40 does not completely act in place, does not act for a long time or has other faults, the pilot valve 40 does not completely act, at this time, the pressure of the control cavity of the two conventional cartridge valves 20 is reduced to some extent but not zero, and the pressure of the control cavity of the novel cartridge valve 30 is increased to some extent but not to full pressure.

At the moment, if the four cartridge valves of the accident pressure distribution valve adopt the conventional cartridge valves. At this time, a conventional cartridge valve 20 (a conventional cartridge valve connecting the emergency oil source and the guide vane closed cavity) for sealing the emergency oil source is opened, pressure oil can enter an oil pipe of the guide vane closed cavity and can also form an opening acting force for the cartridge valve connecting the main distributing valve closed cavity and the guide vane closed cavity, if the cartridge valve is opened at this time, the emergency oil source can enter a main distributing valve of the speed regulator through the cartridge valve, and due to the reduction of the pressure of the main oil source, the cartridge valve of the main distributing valve can be opened in the same way, so that a large amount of the emergency oil source flows into a pressure oil tank and an oil return tank of the main oil source, oil diffusion and oil leakage of the unit are finally caused, and the low-oil-pressure emergency stop of another unit sharing the same emergency oil source is realized.

However, when the cartridge valve connecting the main distributing valve closing cavity and the guide vane closing cavity adopts the novel cartridge valve 30 with the increased control cavity area, even if the control cavity pressure is not full pressure, the valve block area is far larger than the action area of an accident oil source, the accident oil source can not abnormally open the novel cartridge valve 30, but only enters the guide vane closing cavity oil pipe and slowly closes the guide vane, and therefore a series of consequences caused by abnormal opening of a conventional cartridge valve can be avoided.

Claims

1. The utility model provides a novel cartridge valve, includes case (1), bush (2), apron (3), adjusting screw (4), the gliding installation of case (1) is in bush (2), and the tip opening part at bush (2) is installed in apron (3), and the middle part at apron (3) is installed in adjusting screw (4), be equipped with control oil circuit in apron (3), bush (2) are equipped with main oil circuit import and main oil circuit export, let in pressure oil in the control oil circuit and make case (1) remove to the switching of control main oil circuit import and main oil circuit export, its characterized in that: the valve is characterized in that a valve block (5) is arranged in the cover plate (3) in a sliding mode, the valve block (5) is connected with the valve core (1) through a connecting rod (6), and the area of the round end face of the valve block (5) is larger than that of the round end face of the valve core (1).

2. The novel cartridge valve of claim 1, wherein: a threaded hole is formed in the valve core (1), and an external thread is arranged at one end of the connecting rod (6) and connected with the threaded hole of the valve core (1); the valve block (5) is provided with a circular protruding part, the other end of the connecting rod (6) is inserted into the protruding part, and the pin (7) radially penetrates into the protruding part and the connecting rod (6).

3. The novel cartridge valve of claim 1, wherein: adjusting screw (4) gliding installation is on apron (3), and adjusting screw (4) are connected with valve block (5) by the one end of case (1), and the one end of keeping away from case (1) is installed adjustable ring (10), and spring (9) suit is on adjusting screw (4), and spring (9) both ends lean on with adjustable ring (10) and apron (3) respectively and lean on.

4. The novel cartridge valve of claim 3, wherein: the adjusting screw rod (4) is in threaded connection with the valve block (5), and the adjusting screw rod (4) is in threaded connection with the adjusting ring (10).

5. The novel cartridge valve of claim 3, wherein: the outside cover of spring (9) and adjustable ring (10) is equipped with safety cover (8), and safety cover (8) one end opening, the open end and the apron (3) of safety cover (8) are connected.

6. A cartridge valve type speed regulating system is characterized in that: comprising two novel cartridges (30) of any of claims 1-5 and two conventional cartridges (20), and one pilot valve (40); the two novel cartridge valves (30) are in a normally open state, one of the two novel cartridge valves is connected to an oil path of a main distributing valve open cavity and a guide vane open cavity, and the other one of the two novel cartridge valves is connected to an oil path of a main distributing valve close cavity and a guide vane close cavity; the two conventional cartridge valves (20) are in a normally closed state, one of the two conventional cartridge valves is connected to an emergency oil source and a guide vane closed cavity oil path, and the other conventional cartridge valve is connected to an emergency distributing valve oil return pipe and a guide vane open cavity oil path; the control oil paths of the two conventional cartridge valves (20) and the two novel cartridge valves (30) are connected with and controlled by the pilot valve (40).