JPS5981411A - Liquid feeding device - Google Patents

Abstract

PURPOSE:To make the sprayed quantity of a liquid variable by a structure wherein an orifice is provided midway in a liquid passage led from a pressurizing source to a nozzle and a bypass circuit is also provided midway in a liquid passage led from the orifice to the nozzle. CONSTITUTION:Let P1 denote the pressure in a liquid passage led from an electromagnetic pump 3 to an orifice 9 and P2 that from the orifice 9 to a nozzle 4. However, if no orifice 9 exists, the pressures P1 and P2 equal to each other or the sprayed flow rate Qa is obtained at a pressure Pa. When the orifice 9 is then provided, the delivery pressure P1 of the electromagnetic pump 3 is nearly equal to Pa constantly, while the pressure P2 lowers down to Pb because of the decrease of pressure due to the resistance developed at the orifice 9 and the sprayed flow rate at this time also lowers down to Qb. When a valve 8 in a bypass circuit 7 is open under the conditions as mentioned above, the pressure P2 is further reduced to Pc and the sprayed flow rate also reduced to Qc. After all, the flow rate sprayed from the nozzle 4 is variable within the range from Qb to Qc.

Description

[Detailed description of the invention] Technical field This invention uses a liquid that is pressurized by a pressurization source.

The present invention relates to a liquid supply device that supplies liquid by ejecting it from a nozzle.

Although there are various types of prior art liquid supply devices, the following description will be directed to a liquid fuel supply device that supplies liquid fuel to a boiler or the like as an example. FIG. 1 is a diagram showing a liquid circuit of a conventional liquid fuel supply device. In the figure, liquid fuel is stored in a fuel tank 1. Impurities are removed from this liquid fuel by an oil strainer 2, and the liquid fuel is sucked into an electromagnetic pump 3, which is a source of pressure increase. The liquid fuel is pressurized to a constant pressure (7kof/cm2) by this electromagnetic pump 3,
The spray is ejected from the gun nozzle 4 and supplied to a boiler or the like. The amount n of liquid fuel injected from the gun nozzle 4 is determined by the nozzle used and is constant. Therefore, liquid fuel r
The combustion type according to 1 is variable (it is always a single point combustion.

The second nozzle that can make the combustion temperature variable is
There are those shown in the figure.

The nozzle 5 shown in FIG. 2 has a bypass 6,
Therefore, by adjusting the flow rate of the fuel from the bypass 6, which returns to the free tank 1 through the bypass circuit 7, to the valve 8, the spray depth of the liquid fuel from the nozzle 5 can be adjusted. Although such bypass nozzles 5 are used for industrial purposes, they are not very common and are expensive (common gun nozzles as shown in Fig. 1 cost about 450 yen 7/1 piece, whereas the ones shown in Fig. 2 The bypass nozzle shown in is about 3,000 yen/piece). Also, most of the nozzle 4 shown in Figure 1 and the nozzle 5 shown in Figure 2 are imported products, but the bypass nozzle 5 in particular is not in stock due to low demand and is made to order. However, due to issues such as the number of lofts and delivery time, we decided to adopt [4 piles].

Purpose This invention was made to eliminate the above-mentioned drawbacks, and its main purpose is to make the amount of liquid sprayed from the nozzle variable using a general gun nozzle as shown in Fig. 1. An object of the present invention is to provide a liquid supply device that can perform the following steps.

In summary, the present invention is a liquid supply device in which an orifice is provided in the middle of the liquid path from the pressure boost source to the nozzle, and a bypass circuit is further provided in the middle of the liquid path from the orifice to the nozzle.

The above objects and other objects and features of the present invention will become more apparent from the following detailed description with reference to the drawings.

Embodiment Before describing a preferred embodiment according to the present invention, first, the disadvantages of a liquid supply device in which only a bypass circuit is provided in the middle of the liquid path from the pressure boost source to the nozzle will be explained. FIG. 3 is a diagram showing a liquid circuit of such a liquid supply device. In the figure, an electromagnetic pump 3 which is a boost source
The liquid fuel, which has been pressurized to a constant pressure P, is sprayed from the gun nozzle 4 and supplied to a boiler or the like. A bypass circuit 7 is provided in the middle of the liquid path from the electromagnetic pump 3 to the gun nozzle 4.

By adjusting the flow port of the liquid fuel through the bypass circuit 7 with the valve 8, the amount of injection n from the gun nozzle 4 can be made variable. Due to its characteristics, the electromagnetic pump 3 must always maintain a constant pressure. However, in the circuit shown, if it is desired to change the amount of liquid fuel sprayed from the nozzle 4, the liquid fuel is returned to the bypass circuit 7, and the pressure P in the liquid path from the electromagnetic pump 3 to the gun nozzle 4, must be reduced. This places a high load on the electromagnetic pump 3, resulting in problems such as noise generation and shortened service life.

The liquid supply device according to the present invention solves this problem.A FIG. 4 shows a liquid circuit according to an embodiment of the present invention. As shown in the figure, in the liquid supply device according to the present invention, an orifice 9 is provided in the middle of the liquid path from the electromagnetic pump 3, which is a pressure increase source, to the nozzle 4.

Furthermore, a bypass circuit 7 is provided in the middle of the liquid path from the orifice 9 to the nozzle 4. A valve 8 is preferably arranged in this bypass circuit 7.

Now, let the pressure of the liquid path from the electromagnetic pump 3 to the orifice 9 be Pl, and the pressure of the liquid path from the orifice 9 to the nozzle 4 be P2. FIG. 5 shows the relationship between the pressure P2 in the path from the orifice 9 to the nozzle 4 and the spray flow rate from the nozzle 4. Referring to FIGS. 4 and 5, if the orifice 9 does not exist, P, -P2 will be obtained, and a spray flow flQa will be obtained at a pressure pa. When the orifice 9 is provided as shown in FIG. 4, the discharge pressure P1 of the electromagnetic pump 3 is almost constant at pa, but the pressure P2 decreases due to the resistance of the orifice 9 and becomes pb in FIG. Become. The spray flow rate at that time is Qb. Here, as the valve 8 of the bypass circuit 7 is checked, the pressure of P2 decreases accordingly and finally becomes the pressure pc, and a spray flow mQC is obtained. That is, by adjusting the flow rate of the liquid fuel flowing through the bypass circuit 7, the Ill1rA flow range from the nozzle 4 can be varied within a range between Qb and Qc. In this way, by opening the valve 8 and increasing the flow rate of liquid fuel flowing into the bypass circuit 7, the pressure P2 in the liquid path from the orifice 9 to the nozzle 4 decreases, and the spray flow rate from the nozzle 4 decreases. I will do it. On the other hand, regardless of this drop in pressure P2, the discharge pressure P from the electromagnetic pump 3.

Due to the presence of the orifice 9, the pressure drop is small. Therefore, since the electromagnetic pump 3 can maintain a substantially constant pressure, the spray flow rate can be made variable without placing a high load on the electromagnetic pump 3.

As mentioned above, in order to obtain a suitable variable range of spray flow rate, it is desirable that the diameter of the orifice 9 be equal to or slightly larger than the diameter of the nozzle 4. This is because if the diameter of the orifice 9 is too large, the pressure P1 will also drop as the pressure P2 drops, which will have an adverse effect on the electromagnetic pump 3. Furthermore, if the diameter of the orifice 9 is too small, a specified amount of spray flow cannot be obtained from the nozzle 4. However, in this case, the problem can be solved by using a nozzle of one rank higher, that is, a nozzle with a larger diameter. In order to clarify this, in FIG. 5, a curve X shows the flow rate characteristic when a nozzle one rank higher is used.

As shown in the figure, when using a nozzle one rank higher,
For example, when the pressure of P2 is pb, the spray flow rate increases from Qb to Qa.

Although it may be redundant, in order to more fully clarify the liquid supply device according to the present invention described above, a more specific explanation will be given using FIG. 6.

In the figure, the oil level of fuel stored in a reservoir tank 1 is kept constant by an oil leveler 10. This oil leveler 10 also serves as a receiving tray for liquid fuel returned through the bypass circuit 7.

Fuel in the oil leveler 10 is sucked up by the electromagnetic pump 3 and raised to a set pressure. The pressurized liquid fuel then reaches the orifice case 11. A filter 12 is disposed within the orifice case 11, and this filter 12 blocks out dust contained in the liquid fuel in the electromagnetic pump and in the piping. Further, an orifice 9 is arranged in the orifice case 11 , and the fuel that has passed through the orifice 9 is sprayed from the nozzle 4 via a nozzle adapter 13 . On the other hand, a bypass circuit 7 is provided in the middle of the liquid path from the orifice 9 to the nozzle 4. This bypass circuit 7 is preferably provided with a flow control valve 14 . Therefore, if this flow control valve 14 is in a closed state, no fuel returns to the bypass circuit 7, and the spray flow rate from the nozzle 4 becomes maximum. As the flow rate control valve 14 is opened, the flow rate returned to the bypass circuit 7 increases, and vRum from the nozzle 4 decreases accordingly. In this way, the flow rate of the spray from the nozzle 4 can be varied without adversely affecting the electromagnetic pump 3.

FIG. 7 is a sectional view showing one embodiment of the orifice case 11 used in the liquid supply device according to the present invention.

The illustrated orifice case 11 is attached to the outlet of the electromagnetic pump 3. Impurities are removed from the liquid fuel discharged from the electromagnetic pump 3 by a filter 12. The liquid fuel that has passed through the filter 12 passes through the orifice 9 and is branched into two directions. One direction 15 is the liquid path leading to the nozzle, and the other direction 16 is the liquid path leading to the bypass circuit. Various O-rings 17 are further arranged in the orifice case 11 to prevent oil leakage. Further, an air vent hole 18 is provided for venting the air inside the orifice case 11. If the orifice case 11 having such a configuration is directly attached to the outlet end of the electromagnetic pump 3, it will be very advantageous in terms of workability of piping work, ease of piping repair, and ease of replacing the orifice case.

In the embodiments described above, the valve provided in the bypass circuit is not limited to a flow rate control valve, but may be an on-off valve that simply opens and opens. In this case, the amount of spray from the nozzle will be adjusted in two stages. In addition, as a preferred embodiment, a liquid fuel supply device that supplies liquid fuel to a boiler or the like has been described, but the present invention is not limited to such applications, and can also be applied to a liquid fuel supply device that supplies liquid by jetting it from a nozzle. can be widely used.

Effects As described above, according to the present invention, the liquid supply device is provided with an orifice in the middle of the liquid path from the pressure boost source to the nozzle, and further provided with a bypass circuit in the middle of the liquid path from the orifice to the nozzle. The spray flow rate from the nozzle can be made variable while the discharge pressure from the pressurized source is kept substantially constant. Therefore, since a high load is not applied to the boost source, it is possible to eliminate noise from the boost source and shorten the life of the boost source. Further, since the present invention has a very simple circuit construction, the spray flow rate from the nozzle can be made variable using a general gun nozzle that is inexpensive and easily available.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a liquid circuit of a conventional liquid supply device. FIG. 2 is a diagram showing the liquid circuit of the same conventional liquid supply device, but shows an example in which a bypass nozzle is used as the nozzle. FIG. 3 is a liquid circuit diagram used in advance to explain the liquid supply device according to the invention, and the drawbacks occurring in this liquid circuit are eliminated by the liquid supply device according to the invention. FIG. 4 is a diagram showing a liquid circuit of a liquid supply device according to the present invention. FIG. 5 is a graph used to explain that the amount of spray from the nozzle is variable according to the present invention, and shows the relationship between the flow rate of spray from the nozzle and the pressure in the liquid path from the orifice to the nozzle. It shows. FIG. 6 is a diagram showing an embodiment of a liquid circuit according to the present invention. FIG. 7 is a cross-sectional view of a preferred embodiment of an orifice case having an orifice. In the figure, 3 is an electromagnetic pump, 4 and 5 are nozzles, and 7 is an electromagnetic pump.
1 is a bypass circuit, 8 is a valve, 9 is an orifice, 11 is an orifice case, 12 is a filter, and 14 is a flow control valve. (2 idiots) Figure 3 Circulation 4 Centurion 50 Acceptance P2

Claims (6)

[Claims] (1) In a liquid supply device that jets and supplies liquid pressurized by a pressurization source from a nozzle, an orifice is provided in the middle of the liquid path from the elevating and FE source to the nozzle, and further from the orifice to the nozzle. A liquid supply device that has a bypass circuit in the middle of the liquid path. (2) The liquid supply f+a device according to claim 1, wherein the bypass circuit is provided with a valve. (3) The liquid supply device according to claim 2, wherein the valve is a flow control valve. (4) The liquid supply device according to any one of claims 1 to 3, wherein the diameter of the orifice is equal to or slightly larger than the diameter of the nozzle. (5) The liquid supply device according to any one of claims 1 to 4, wherein a filter is provided in the liquid path from the pressurization source to the orifice. (6) The liquid supply device according to any one of claims 1 to 5, wherein the pressure increase source is an electromagnetic pump.