JPS5916116B2 - water supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to simplify the structure by providing a single pressure regulating valve with multiple functions, and at the same time to increase the efficiency of the pump.

When water is supplied to the boiler by a pump, the law stipulates that the water pressure applied to the boiler is one field below.
Conventionally, the piping is as shown in Figure 1.

In Figure 1, 1 is a water tank, 2 is a water tank, 3 is a pressure reducing valve, 4 is a safety valve, and 5 is a boiler.The water that is once stored in the water tank is pumped up and pressurized by the pump 2, and the pressure is reduced to 1ψ by the pressure reducing valve 3. After dropping
It is supplied to the boiler 5 through the safety valve 4.

A Wesco pump or a Tuff-bin jet pump is usually used as the pump 2, but the Wesco pump is originally suitable for obtaining a high head, and its pumping characteristics are not very good below 1 kg/lya.

Also, since the driving sound is large, it cannot be said to be suitable as a pump for boiler water supply.

On the other hand, a turbine jet pump usually has a structure as shown in FIG. 2, in which a portion of water pressurized by an impeller 6 is returned to a jet nozzle 7 to obtain a high head.

However, as a water supply pump to a boiler, such a high head is originally unnecessary, and the reason why a turbine jet pump is used for boiler water supply is because a pressure switch is installed in the discharge side passage via a pressure tank 8. This is to ensure that 9 is activated.

Further, this turbine jet pump is provided with a regulating valve 10 at the discharge port in order to obtain return water to the jet nozzle 7, and since the discharged water flows while pushing this regulating valve open, resistance loss and deficiency are avoided. occurs, reducing efficiency.

The present invention aims to eliminate such drawbacks, and has an opening of a return waterway returning to the jet nozzle of the pump and a valve port of the discharge waterway facing each other in the discharge side passage of a turbine jet pump. A pressure detection means is provided in a pressure detection chamber on the side of the side passage, and a pressure regulating valve operated by the pressure detection means selectively closes the opening and the valve port, whereby the discharge side passage of the pump A single pressure regulating valve regulates the pressure inside the tank and the amount of water returned to the jet nozzle.During normal operation, the pressure regulating valve closes the opening of the return waterway and returns water to the jet nozzle. Since there is no pressure, the efficiency is high, and unlike conventional jet pumps, there is no need to push open the pressure regulating valve with the dynamic pressure of the water flow to obtain return water, so there is less resistance loss, and from this point of view, it also works to improve efficiency. It is something.

An embodiment of the present invention will be described with reference to FIG. 3 and subsequent figures.

In Fig. 3, 11 is a water tank, 12 is a turbine jet pump, 13 is a valve device, 14 is a safety valve, 15 is a boiler,
These are connected in series, and a part of the water from the valve device 13 returns to the turbine jet pump 12, and a pressure tank 16 is provided between the turbine jet pump 12 and the valve device 13. At the same time, a pressure switch 17 is also connected to this 9-pressure tank.

FIG. 4 is a detailed sectional view of the valve device, in which a pressure regulating valve 19 is provided in the discharge side passage 18 of the turbine jet pump 12, and a pressure detection chamber 20 is formed in communication with the discharge side passage downstream of the pressure regulating valve.

A diaphragm 21 as a pressure detection means is stretched on the ceiling of the pressure detection chamber, and on the upper surface of the diaphragm,
Spring 22 for pressing this diaphragm downward
is provided.

The strength of this spring is adjusted by screw A.

On the other hand, a valve stem 23 is installed in the center of the diaphragm 21, and the pressure regulating valve 19 are integrally formed.

Reference numeral 25 denotes a jet return waterway for branching from the discharge side passage 18 and returning a part of the discharged water to the jet nozzle of the turbine jet pump 12, and the opening 2 of the return waterway
6 is opposed to a valve port 27 formed in the middle of the discharge side passage, and these openings 26 and valve port 27 are connected to the pressure regulating valve 19.
It is opened and closed by

28 and 29 are valve seats provided in these openings 27, 30 is a backing provided around the pressure regulating valve 190, and 31 is a guide piece for preventing the pressure regulating valve 19 from swinging left and right when it moves up and down.

The operation will be explained below.

While the pump is operating, the water pressure in the discharge side passage 18 is 1 kg/cr.
When the pressure is less than or equal to i, the pressure regulating valve 19 completely closes the opening 26 of the jet return waterway and fully opens the valve port 27 in the discharge side passage.

When the water pressure in the discharge side passage 1i becomes 1 kg/d or more during operation, the pressure in the pressure detection chamber 20 also rises, the diaphragm 21 bends upward against the spring 22, and the valve stem 23 moves upward. Moving.

As a result, the pressure regulating valve 19 also moves upward and the opening degree of the valve port 27 is reduced, so that the water pressure in the discharge side waterway downstream of the pressure regulating valve 19 decreases, and the flow is returned to the first episode.

On the other hand, when the pressure regulating valve 19 moves upward, the opening 26 of the jet return channel opens, and a part of the water flowing through the discharge side passage 18 returns to the jet nozzle of the turbine jet pump 12 through the jet return channel 25. This pump starts operating as a jet pump.

Even if the opening degree of the valve port 27 is reduced, the pressure detection chamber 20
When the internal pressure increases, the diaphragm 21 bends further upwards, and the adjustment 1 pressure valve 19 completely closes the valve port 27.

In this case, all the water flowing through the discharge passage 18 upstream of the pressure regulating valve 19 returns to the turbine jet pump 12 through the jet return waterway 25, so the jet capacity of this pump increases and the water flowing upstream of the pressure regulating valve 19 The water pressure in the side discharge passage 18 is suddenly increased, the pressure switch 17 is turned off, and the pump 12 is stopped.

As described above, the present invention provides pressure regulation in the discharge side passage of a pump,
Since the amount of water returned to the jet nozzle is adjusted by a single pressure regulating valve, the cost of the apparatus can be reduced.

In addition, when operating as a normal turbine pump, the pressure detection means detects the low pressure in the discharge side passage, and the pressure regulating valve closes the opening of the return waterway to eliminate return water to the jet nozzle. Efficiency can be increased, and when operating as a jet pump, there is no need to push open the regulating valve with the dynamic pressure of the water flow to obtain return water, unlike conventional jet pumps, so resistance loss can be reduced. Efficiency can be improved both during normal operation and when operating as a jet pump.

Further, if the pressure detection means is constituted by a diaphragm provided downstream of the pressure regulating valve, and the valve stem of the pressure regulating valve is attached to this diaphragm, the device can be operated reliably with a simple structure.

In addition, if a pressure switch is connected to the discharge side passage between the turbine jet pump and the opening of the return waterway, and a boiler is connected to the tip of the discharge side passage, when the pressure in the discharge side passage is low, the jet Since there is no water returned to the nozzle, the pump operates as a turbine pump, and the discharge side pressure is less likely to become higher than necessary. Therefore, it is possible to provide a suitable water supply device for a boiler with limited pressure.

Also, when the water intake from the boiler is stopped and the pressure rises, the return waterway is opened and it immediately operates as a jet pump, rapidly increasing the pressure, and the pressure switch operates quickly, so it is just a turbine pump. It is possible to provide a water supply device to a boiler that is safer than when using a boiler.

[Brief explanation of drawings]

Figure 1 is a diagram of a conventional water supply route to a boiler, Figure 2 is a longitudinal cross-sectional side view of a conventional jet pump, Figure 3 is a diagram of a water supply route to a boiler according to the present invention, and Figure 4 is a longitudinal cross-section of a valve device. It is a front view. 12-- Turbine jet pump, 16... Pressure tank, 17... Pressure switch, 18... Discharge side passage, 20... Pressure detection chamber, 21... Pressure detection means, 2
5... Second return waterway, 26... Opening of the second return waterway, 27.
...benchmark.

Claims (1)

[Scope of Claims] 1. The opening of the return waterway returning to the jet nozzle of the pump and the valve port of the discharge side passage are provided in the discharge side passage of the terbisi jet pump so as to face each other, and the pressure on the side of the discharge side passage is A water supply device characterized in that a pressure detection means is provided in the detection chamber, and the opening and the valve port are selectively closed by a pressure regulating valve operated by the pressure detection means. 2. The water supply device according to claim 1, wherein the pressure detection means is constituted by a diaphragm provided downstream of the pressure regulating valve, and a valve stem of the pressure regulating valve is attached to the diaphragm. 3. The water supply device according to claim 1, wherein a pressure switch is connected to the discharge side passage between the turbine jet pump and the opening of the return waterway, and a boiler is connected to the tip of the delivery side passage. .