Jet valve signal pressure action point adjusting device

Abstract

The invention relates to a jet valve signal pressure action point adjusting device which comprises an adjusting device body, a corrugated pipe assembly, an action piece, an elastic connecting structure and a position adjusting structure, the corrugated pipe assembly is fixedly connected to the adjusting device body, a corrugated pipe at the lower end of the corrugated pipe assembly is connected with the action piece, and the action piece acts on a lever of a jet valve through an arc bottom. The other end of the acting sheet is connected with the adjusting device body through an elastic connecting structure; and a position adjusting structure is connected between the adjusting device body and the jet flow valve shell. The device is convenient to adjust the position of a signal pressure acting point, compact in structure, reliable in work and applicable to small marine turbines needing different jet valve signal pressure characteristics.

Description

Technical Field

[0001] The invention relates to a jet valve for a small steam turbine used in a ship, in particular to a device for adjusting the signal pressure action point of the jet valve. Background Art

[0002] Jet valves are still widely used in the field of regulation of small marine steam turbines, especially when boiler pressure and feed pump outlet pressure are used as two signal pressures of the jet valve. When the position of the signal pressure action point is constant, when the output state of the jet valve is the same, there is a linear straight line equation relationship between the two signal pressures received by the jet valve. By changing the position of the signal pressure action point, the slope of the linear straight line equation can be changed, so that it has a wider range of use. Therefore, it is necessary to design a jet valve signal pressure action point adjustment device for use in small steam turbines in the field of marine hydraulic regulation. By adjusting the position of the signal pressure action point on the lever, the slope of the linear equation between the signal pressures can be easily changed, thereby expanding the scope of use of the jet valve and making it easier to set and adjust on site according to actual usage. Summary of the invention

[0003] The present invention proposes a jet valve signal pressure action point adjustment structure, which can conveniently change the signal pressure action point through a device combining an adjustment screw, a stopper, an action sheet and a bellows assembly, and is suitable for small steam turbines in the field of marine hydraulic regulation.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a jet valve signal pressure action point adjustment device, including an adjustment device body, a bellows assembly, an action plate, an elastic connection structure, and a position adjustment structure. The bellows assembly is fixedly connected to the adjustment device body, and the bellows at the lower end of the bellows assembly is connected to the action plate. The action plate acts on the lever of the jet valve through the arc bottom, and the other end of the action plate is connected to the adjustment device body through the elastic connection structure; a position adjustment structure is connected between the adjustment device body and the jet valve housing.

[0005] Further, the bellows assembly is fixed to the adjustment device body by means of bellows assembly mounting bolts.

[0006] Furthermore, the bellows assembly includes a signal pressure pipe joint, a square joint, a push rod and a bellows. The push rod is placed in the square joint and the lower end is connected to the bellows. The signal pressure pipe joint is connected to the square joint. The lower end of the bellows is connected to the action plate through a cylindrical pin and a compensation gasket.

[0007] Furthermore, the signal pressure is connected through the signal pressure pipe joint on the bellows assembly, and acts on the action plate with the arc bottom through the cylindrical pin and the compensation gasket.

[0008] Furthermore, the elastic connection structure includes a spring sheet, a connecting sheet, and a mounting sheet. One end of the connecting sheet is connected to the action sheet through the spring sheet, and the other end is connected to the mounting sheet through the spring sheet. The mounting sheet is fixed to the adjustment device body with mounting bolts.

[0009] Furthermore, the position adjustment structure includes an adjustment screw and a stopper. The stopper is fixed to the jet valve housing with a stopper mounting bolt and is connected to the adjustment device body through an adjustment screw, so as to adjust the position of the bottom of the arc of the action plate on the jet valve lever, thereby changing the signal pressure characteristics.

[0010] Furthermore, the stopper is L-shaped, the bottom plate is provided with a stopper mounting threaded hole, and the right-angle plate is provided with a stopper U-shaped groove. The adjustment screw is clamped in the stopper U-shaped groove of the stopper and rotates.

[0011] The beneficial effects of the present invention are:

[0012] The device of the invention is convenient for adjusting the position of the signal pressure action point, has a compact structure, and is reliable in operation, and can be applied to small marine steam turbines that require different jet valve signal pressure characteristics.

[0013] The present invention can be applied to the occasion of a jet valve with a deflection plate. High-pressure water is sprayed out from a nozzle and flows to two receiving holes through the deflection plate. The receiving holes are connected to two output pipes and can lead to the hydraulic cylinder piston and other devices to be driven respectively. Two signal pressures (such as the pressure of a marine boiler and the outlet pressure of a feedwater pump) act on a lever connected to the deflection plate. Changing the signal pressure can cause the lever to rotate, thereby driving the deflection plate to swing, and then changing the output state of the jet valve. When the position of the signal pressure action point on the lever is constant, under the same output state, the relationship between the signal pressures is a straight line equation relationship, and the slope of the straight line is determined by the position of the signal pressure action point. By adjusting the position of the signal pressure action point on the lever, the slope of the straight line equation between the signal pressures can be conveniently changed, thereby expanding the scope of use of the jet valve and making it easier to set and adjust on site according to actual usage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a device for adjusting the pressure action point of a jet valve signal of the present invention;

[0015] Figure 2 is a schematic diagram of a bellows assembly;

[0016] Figure 3 It is the three-view drawing of the stop structure;

[0017] Among them: (a) is the main view, (b) is the left view, and (c) is the top view;

[0018] Figure 4 It is a schematic diagram of the adjustment screw;

[0019] Figure 5 It is a schematic diagram of the jet valve signal pressure action point adjustment device applied to the deflection plate type jet valve;

[0020] Figure 6 yes Figure 5 AA section view. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, an embodiment of the present invention provides a jet valve signal pressure action point adjustment device, which includes a stopper mounting bolt 1, an adjustment screw 2, a stopper 3, a mounting bolt 4, an adjustment device body 5, a bellows assembly mounting bolt 6, a bellows assembly 7, an O-ring 8, a bellows assembly O-ring 9, a cylindrical pin 10, a compensation gasket 11, an action plate 12, a spring plate 13, a mounting bolt 14, a connecting plate 15, and a mounting plate 16.

[0023] like Figure 2 As shown, the bellows assembly 7 is composed of a signal pressure pipe joint 7-1, a square joint 7-2, a push rod 7-3, an O-ring 8 and a bellows 7-4.

[0024] The bellows assembly 7 is fixed to the adjusting device body 5 by the bellows assembly mounting bolts 6. The action sheet 12 is connected to the connecting sheet 15 and the mounting sheet 16 by the spring sheet 13, and is fixed to the adjusting device body 5 by the mounting bolts 14. The signal pressure is connected through the signal pressure pipe joint 7-1 on the bellows assembly 7, and acts on the action sheet 12 with the arc bottom A through the cylindrical pin 10 and the compensation sheet 11, and the action sheet 12 acts on the lever of the jet valve through the arc bottom A. The cylindrical pin 10 is used to connect the compensation gasket 11 with the bellows 7-4, and the compensation gasket 11 can make the signal pressure transmitted through the bellows 7-4 more uniform. Changing the position of the arc bottom of the action sheet 12 on the lever can change the slope of the linear relationship between the signal pressures, thereby changing the signal pressure characteristics.

[0025] When the device of the invention is used, it is fixed on the housing of the jet valve by four mounting bolts 4, and the stopper 3 is fixed on the housing of the jet valve by the stopper mounting bolts 1.

[0026] like Figure 3 As shown in (a), (b) and (c), the stopper 3 is L-shaped, a stopper mounting threaded hole is provided on the bottom plate, and a stopper U-shaped groove is provided on the right-angle plate. Figure 4 The adjusting screw 2 is shown, and the adjusting screw 2 is stuck in the stopper U-shaped groove of the stopper and rotates.

[0027] Take the application of the device to a deflection plate type jet valve as an example. The jet valve uses water as the working medium. The water supply main 23 provides high-pressure water, which is sprayed out after passing through two nozzles 24. At the same time, there are two receivers 20 corresponding to two output pressures (P1, P2), see Figure 5 , as shown in FIG6. The deflection plate 21 is mounted on the lever 22, and the lever 22 rotates with the rolling bearing 25 as a fulcrum. The two signal pressures act on the lever 22 through the bellows assembly 7 respectively. One of the bellows assemblies 7 is provided by the signal pressure action point adjustment device of the device of the present invention, and the position of the signal pressure acting on the lever 22, that is, the action arm, can be adjusted. During adjustment, if it is necessary to increase the action arm of the signal pressure action point, the mounting bolt 4 can be loosened first, and the adjustment screw 2 can be rotated clockwise. Since the adjustment screw 2 is installed in the U-shaped groove of the stopper 3 without axial displacement, the adjustment device body 5 will move relative to the adjustment screw 2 and approach the stopper 3, thereby increasing the action arm of the signal pressure action point. After adjusting to the appropriate position, the mounting bolt 4 can be tightened again. Conversely, when it is necessary to reduce the action arm of the signal pressure action point, the mounting bolt 4 can be loosened first, and the adjustment screw 2 can be rotated counterclockwise. Similarly, since the adjustment screw has no axial displacement, the adjustment device body 5 will move away from the stopper 3. After reaching the appropriate position, the mounting bolt 4 can be tightened again.

Claims

1. A device for adjusting the pressure action point of a jet valve signal, characterized in that: It includes an adjustment device body, a bellows assembly, an action sheet, an elastic connection structure, and a position adjustment structure. The bellows assembly is fixedly connected to the adjustment device body, the bellows at the lower end of the bellows assembly is connected to the action sheet, the action sheet acts on the lever of the jet valve through the arc bottom, and the other end of the action sheet is connected to the adjustment device body through the elastic connection structure; the position adjustment structure is connected between the adjustment device body and the jet valve housing.

2. The device for adjusting the pressure action point of a jet valve signal according to claim 1, characterized in that: The bellows assembly is fixed to the adjusting device body by bellows assembly mounting bolts.

3. The device for adjusting the signal pressure action point of a jet valve according to claim 1, characterized in that: The bellows assembly includes a signal pressure pipe joint, a square joint, a push rod and a bellows. The push rod is placed in the square joint, and the lower end is connected to the bellows. The signal pressure pipe joint is connected to the square joint, and the lower end of the bellows is connected to the action plate through a cylindrical pin and a compensation gasket.

4. The device for adjusting the pressure action point of a jet valve signal according to claim 3, characterized in that: The signal pressure is connected through the signal pressure pipe joint on the bellows assembly, and acts on the action plate with a circular arc bottom through a cylindrical pin and a compensation gasket.

5. The device for adjusting the signal pressure action point of a jet valve according to claim 1, characterized in that: The elastic connection structure includes a spring sheet, a connecting sheet and a mounting sheet. One end of the connecting sheet is connected to the action sheet through the spring sheet, and the other end is connected to the mounting sheet through the spring sheet. The mounting sheet is fixed to the adjusting device body with mounting bolts.

6. The device for adjusting the signal pressure action point of a jet valve according to claim 1, characterized in that: The position adjustment structure includes an adjusting screw and a stopper. The stopper is fixed to the jet valve housing with a stopper mounting bolt and is connected to the adjustment device body through an adjusting screw. The stopper is used to adjust the position of the arc bottom of the action piece on the jet valve lever, thereby changing the signal pressure characteristics.

7. The device for adjusting the signal pressure action point of a jet valve according to claim 6, characterized in that: The stopper is L-shaped, the bottom plate is provided with a stopper mounting threaded hole, the right angle plate is provided with a stopper U-shaped groove. The adjustment screw is clamped in the stopper U-shaped groove of the stopper and rotates.

Images