JP2507914B2 - Underwater vehicle propulsion device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion device for underwater vehicles.

[0002]

2. Description of the Related Art A conventional device will be described with reference to FIG. The combustor 1 is a welded product composed of a SUS monotube and front and rear flanges, and lithium (Li) is cast inside. Sulfur hexafluoride (SF ₆ ) is injected into the interior of the combustor 1 via the SF ₆ control valve 9 and reacts with Li to generate heat.

The feed water discharged from the feed water pump 4 is sent to the combustor 1 via the feed water flow meter 10, flows in the monotube of the combustor 1, and is heated by the reaction heat of Li and SF _6. Generates steam. The generated steam works on the turbine 2 to drive the propeller 14 of the underwater vehicle. The exhaust gas from the turbine 2 is condensed in the condenser 3 and then sent to the combustor 1 by the water supply pump 4 again. The above is the basic cycle.

Next, as the control system of this propulsion device, SF
It is divided into ₆ systems and water supply systems. The SF ₆ system control system calculates the opening degree command to the SF ₆ control valve 9 after the controller 6 calculates from the instruction value of the steam thermometer 11 that detects the temperature of the steam generated by the combustor 1 and the rotation speed of the turbine 2. Give SF
₆ Adjust the flow rate to control the calorific value inside the combustor 1 to an appropriate value.

In the control system of the water supply system, the controller 6 calculates from the instruction value of the water supply flow meter 10 and the rotation speed of the turbine 2, and then gives an opening command to the water control valve 5 to return the amount of water supplied, that is, the water supply. The amount of water supplied from the pump 4 returns to the upstream side of the water supply pump 4 via the water control valve 5 and is adjusted.

By adjusting the amount of return water, the combustor 1
Control is performed so that the amount of water supplied to the turbine is adjusted and finally the rotational speed of the turbine 2 is kept constant. Significantly turbine 2
When it is necessary to decelerate the rotation speed of, by injecting the return water from the water control valve 5 into the steam line at the inlet of the turbine 2 via the solenoid valve 7 and the spray nozzle 8,
The steam temperature is lowered to the moist steam range to decelerate.

[0007]

In the above-mentioned conventional apparatus, the combustion state of the combustor 1 is transiently improved, and the rotation of the turbine 2 due to the generation of a large amount of steam rapidly exceeds the rated rotation speed. There is no function to prevent rising overruns. That is, in this type of device, normally the turbine 2
A steam control valve is installed at the inlet of the turbine to prevent a rapid increase in turbine speed exceeding the rated speed by closing the steam control valve to prevent damage to the turbine rotor due to excessive rotation. There is. However, it is difficult to apply the steam control valve to this underwater vehicle due to space limitations.

The present invention eliminates the above-mentioned drawbacks found in the conventional apparatus, and has a structure that surely avoids turbine overrun, and does not thereby impair the stability of ordinary speed control. It is an object to provide a propulsion device for mid-water vehicles.

[0009]

In order to solve the above-mentioned problems, according to the present invention, as shown in the embodiment of FIG. 1, a part of the discharge water of the conventional water supply pump 4 is supplied to the same water supply pump 4.
In addition to the water supply from the inlet side of the turbine and the passage supplied by switching to the inlet steam line of the turbine, a spray line for guiding the discharge water of the water supply pump 4 to the inlet steam line of the turbine 2 is provided. The solenoid valve 12 that is opened when the number of rotations exceeds a predetermined value is interposed.

This solenoid valve is configured to be opened according to a command from the control device when the number of revolutions of the turbine sharply rises above the rated number of revolutions to spray the feed water to the steam line at the turbine inlet.

[0011]

In the above structure, in the high speed operation state, the valve of the water control valve 5 on the control valve 7 side shown in FIG.
The valve on the side is opened / closed to control the amount of return water of the feed water, thereby controlling the speed. Further, in the low speed operation state, the speed control is performed by closing the valve of the water control valve 5 on the side of the condenser 3 and opening / closing the valve of the control valve 7 on the side to inject into the steam line.
Therefore, in the switching between the high-speed operating state and the low-speed operating state using only the water control valve 5, if the turbine 2 overruns, the switching from the high-speed operating state to the low-speed operating state will shift stepwise. The continuity of control is interrupted, and the flow rate of water supplied to the combustor 1 fluctuates greatly. However, in the propulsion device according to the present invention, the amount of steam generated increases due to the change in the combustion state in the combustor 1, and the turbine 2
If the number of revolutions of the water rapidly rises above a predetermined value such as the rated number of revolutions and reaches an overrun state, before the switching operation from the high speed operating state to the low speed operating state by the water control valve 5, the electromagnetic control is performed. The valve 12 is opened, the discharge water of the feed water pump 4 is guided to the inlet line of the turbine 2 through the above spray line different from the water control valve 5 side, and the feed water guided to this inlet steam line is sprayed. By decelerating the turbine, damage to the turbine rotor can be prevented, and there is no inconvenience that the feed water flow rate to the combustor 1 side fluctuates greatly at this time.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the device according to the present invention will be specifically described below with reference to FIG. In FIG. 1, the same parts as those in the conventional apparatus shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted.
In the apparatus according to the embodiment of the present invention shown in FIG. 1, a spray line is newly provided between the discharge side of the feed water pump 4 and the inlet steam line of the turbine 2, and the solenoid valve 12 is provided in this spray line.
Is intervening. The spray line is connected to the inlet steam line via a spray nozzle 13.

This solenoid valve 12 is opened by a command from the controller 6 before the turbine rotor is damaged when the rotational speed of the turbine 2 exceeds the rated rotational speed and suddenly rises to the steam line at the inlet of the turbine 2. Spray the water supply.

The spray nozzle 13 is provided for adjusting the amount of spray water supplied to the steam line. Combustor 1
During normal operation of 1, the opening of the SF ₆ control valve 9 and the water control valve 5 is adjusted by a command from the controller 6 so that the propeller 14 has a constant rotation speed.

As described with reference to the apparatus of FIG. 2, the conventional apparatus is configured to inject into the inlet steam line of the turbine 2 via the solenoid valve 7 and the spray nozzle 8 to prevent overrun of the turbine 2. As a method for avoiding this, it is possible to use this conventional feed water spray line, but in this case, since the feed water flow rate flowing into the combustor 1 largely changes before and after spraying, continuous control is difficult.

By adopting a spray line for preventing overrun, which is different from the water supply control system having the water control valve 5 according to the present invention, the flow rate of the water supply does not greatly change before and after the water supply spray operation. Therefore, it is possible to prevent overrun of the turbine and realize stable control before and after the water supply spray operation.

[0017]

According to the present invention, in addition to the water supply spray line in the conventional water supply control system, an overrun prevention water supply spray line for guiding water supply from the discharge side of the water supply pump to the inlet steam line of the turbine by the spray nozzle is provided. As a result, the operation can be continued without significantly disturbing the stability of the normal rotation speed control.

As a result, when the combustion state of the combustor is transiently improved, the amount of steam generated increases, and the turbine speed rapidly rises above the rated speed and overruns,
It is possible to reliably prevent damage to the turbine rotor by opening the electromagnetic valve of the feed water spray line and temporarily injecting spray water to the turbine inlet steam line in response to a command from the controller to reduce the turbine rotation speed.

[Brief description of drawings]

FIG. 1 is a system diagram of a propulsion device according to a first embodiment of the present invention.

FIG. 2 is a system diagram of a conventional propulsion device.

[Explanation of symbols]

1 ... Combustor, 2 ... Turbine, 3 ... Condenser, 4 ... Water supply pump, 5 ... Water control valve, 6 ... Controller, 7 ... Solenoid valve, 8
... spray nozzle, 9 ... SF ₆ control valve, 10 ... feed water flow meter, 11 ... steam thermometer, 12 ... solenoid valve, 13 ... spray nozzle, 14 ... propeller.

Claims (1)

(57) [Claims] 1. A combustor that receives an oxidant supply and generates heat to generate steam, a turbine that is driven by the steam from the combustor to drive a propeller to rotate, and a condensate that condenses steam discharged from the turbine. Unit, a water supply pump for supplying water from the condenser to the combustor, and a part of discharge water of the water supply pump
The inlet side of the feed pump and the inlet steam line of the turbine.
In a propulsion device for an underwater vehicle, which has a water control valve for switching and supplying the same to a part of the discharge water of the water supply pump.
On the inlet side of the feed pump and on the inlet steam line of the turbine
A spray line that guides the discharge water of the water feed pump to the inlet steam line of the turbine, and a spray line that is interposed in the spray line and opens when the rotational speed of the turbine exceeds a predetermined value, separately from the water supplied from the passage for switching and supplying. An underwater vehicle propulsion device having an electromagnetic valve that is operated.