JPH0249475Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an oil flow rate regulator that maintains a desired constant flow rate of fuel oil supplied to a liquid combustor such as an kerosene stove, and particularly relates to an improvement of an outflow volume control unit. It is something.

[Conventional technology and its problems]

Conventionally, this type of oil amount regulator shown in FIG. 3 is disclosed in Japanese Utility Model Application Publication No. 108026/1983. This oil amount regulator has a hollow cylindrical guide body 4 having an outlet 3 erected in an oil chamber 2 in which a constant oil level L is maintained, and is movable up and down using the inner wall of the cylindrical guide body 4 as a guide. A flow rate regulating hole 7 extending in the axial direction of the valve lever 5 is bored in the valve rod 5, and the amount of oil flowing out is controlled by the opening area of the flow rate regulating hole 7 facing the oil chamber 2. The fuel oil is supplied to the outlet in a controlled manner. A cap 12 is fitted onto the upper end of the valve rod 5, and is always biased to extend upward between the radially expanding portion of the cap 12 and the upper end of the cylindrical guide body 4. A coil spring 10 is inserted. Further, an adjusting screw 11 is screwed into the lid 14, and its tip abuts against the center of the cap 12.

The oil amount regulator with such a structure has an adjustment screw 11.
is rotated with a screwdriver or the like (not shown) to move the valve rod 5 up and down, thereby changing the opening area of the outflow amount regulating hole 7 facing the oil chamber 2, thereby adjusting the amount of outflowing oil. Note that some models use a cam mechanism instead of the adjusting screw 11 to adjust the oil amount.

In the oil volume regulator configured as above, the flow rate Q is expressed as Q∝A×√2 (g: gravitational acceleration), and the opening area A of the flow rate regulation hole 7 and the center of the flow rate regulation hole 7 It is determined by the height H from to the oil level L. Therefore, if the valve lever 5 is raised by Δh as shown in FIG.
h/2 decreases, and the opening area A increases by ΔA. As a result, the amount of oil spilled is Q∝(A+△A)√2(-△
h/2). As you can see from this formula, the valve is 5.
Although the opening area A and oil head H change in opposite directions with respect to the displacement of , the change in △h/2 is very small compared to the change in △A, Changes in outflow amount become large.

Therefore, the adjustment screw 11 and the cam mechanism are required to have extremely high precision and reliability, which leads to a complicated and large structure, resulting in high costs, and if no measures are taken, vibrations and There were drawbacks such as the valve rod being misaligned due to impact, etc., and the amount of spilled oil easily fluctuating.

[Purpose of invention]

Therefore, the purpose of the present invention is to solve these problems with conventional oil volume regulators, and to create a highly reliable one that has a simple structure, is inexpensive, and does not easily fluctuate the amount of oil spilled due to vibrations, shocks, etc. The purpose of the present invention is to provide an oil amount regulator.

[Means for solving problems]

To achieve this purpose, a small-diameter hollow cylindrical weir is formed inside the valve rod, which has a distance from the inner wall of the valve rod, and which terminates above the flow rate regulating hole and below the oil level in the oil chamber. a large diameter hollow cylindrical part is integrally provided at the lower part of the small diameter hollow cylindrical part,
It is fitted into the inner wall of the valve rod.

[Effect]

According to the present invention, the rate of change in the amount of oil flowing out relative to the change in the vertical position of the valve rod is made gentler by the weir provided on the outflow side of the outflow amount regulating hole.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 denotes an oil amount regulator main body, and a constant oil level is maintained in an internal oil chamber 2 by an inflow valve including an overflow structure and a float (not shown). In addition,
Fuel oil is supplied to the oil chamber 2 by using a level difference or by forcibly pumping it up from an oil tank (not shown) with a pump (not shown).

A hollow cylindrical guide body 4 having an outlet 3 is erected in the oil chamber 2 . A valve lever 5 is disposed inside the cylindrical guide body 4 so as to be movable up and down using the inner wall of the guide body as a guide. The valve rod 5 has a hollow cylindrical shape, and an outflow regulating hole 7 extending in the axial direction of the valve rod 5 is bored in the side surface.

The inside of the valve rod 5 has a gap with the inner wall of the valve rod,
Furthermore, a small-diameter hollow cylindrical portion 131 of the weir 13 is inserted above the outflow regulating hole 7 and ending below the oil level L of the oil chamber 2.

Further, a large diameter hollow cylindrical part 132 is integrally provided at the lower part of the small diameter hollow cylindrical part 131 of the weir 13 and is fitted into the inner wall of the valve rod 2.

Further, a cap 12 is fitted onto the upper end of the valve rod 5, and is always urged to extend upward between the radially expanding portion of the cap 12 and the upper end of the cylindrical guide body 4. A coil spring 10 is inserted. Also, a lid 14 that covers the top surface of the oil chamber 2
An adjusting screw 11 is screwed into the cap, and its tip abuts against the center of the cap 12.

The oil amount regulator of the embodiment having the above configuration moves the valve rod 5 up and down by rotating the adjustment screw 11 with a screwdriver or the like (not shown), thereby changing the opening area of the outflow amount regulating hole 7. The amount of oil flowing out from the hole is controlled.

In addition, the fuel regulated by the outflow control hole 7 is
The fuel passes over the upper end of the hollow cylindrical portion 131 of 3 and is supplied to the combustion section of the combustor through the inside of the weir 13 and further through the outlet 3.

The amount of spilled oil Q supplied to the outlet 3 at this time is expressed as Q∝(A+△A)√2' (g: gravitational acceleration), and the opening area A of the flow rate regulating hole 7 and the weir 1
It is determined by the height H' from the upper end of the small-diameter hollow cylindrical portion 131 of No. 3 to the oil level L. Therefore, if the valve stem 5 is raised by Δh, the height H' from the upper end of the oil head, that is, the small-diameter hollow cylindrical portion 131 to the oil level L, decreases by Δh, and the opening area A increases by ΔA.
As a result, the outflow amount Q∝(A+△A)√2(′−△
h). As can be seen from this equation, the opening area A and the oil head H' change in opposite directions with respect to the displacement of the valve rod 5, but since the change in △h is sufficiently large compared to the change in △A, The change in the outflow amount with respect to the change in the vertical position of 5 becomes small.

By the way, assuming that the oil temperature in the oil chamber 2 is rising due to the influence of the temperature of the combustion section, the viscosity of the fuel oil decreases as the oil temperature rises, increasing the flow velocity of the fuel oil flowing into the outflow regulating hole. However, as this flow rate increases, the flow of fuel oil contracts and the effective opening area of the outflow regulating hole 7 decreases, resulting in a decrease in the viscosity of the oil, which compensates for the increase in the outflow amount. .

On the other hand, when the oil temperature decreases, the effective area of the outflow regulating hole 7 increases as the flow velocity flowing into the outflow regulating hole 7 decreases due to the completely opposite effect to the above.
Corrects the decrease in flow rate due to drop in oil temperature.

Note that this amendment mode is based on the 1986 proposal proposed by the applicant.
The details are shown in the application for utility model registration (2) submitted on March 6, 2017. Incidentally, the change in the outflow amount with respect to temperature in the embodiment has the characteristic shown by the arrow A in FIG. 5, and the change in the outflow amount in the conventional example has the characteristic shown by the arrow B.

[Effect of idea]

As described above, according to the present invention, there is a small-diameter weir inside the valve rod that is spaced from the inner wall of the valve rod and further terminates above the flow rate regulating hole and below the oil level in the oil chamber. Since the hollow cylindrical part is inserted, it is possible to provide a highly reliable oil amount regulator that has a simple and inexpensive structure, and that the amount of spilled oil does not easily fluctuate due to vibrations, shocks, and even temperature changes.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the oil amount regulator of the present invention, Fig. 2 is an exploded perspective view of a similar embodiment, and Fig. 3 is an exploded perspective view of a similar embodiment.
The figure is a sectional view showing a conventional oil amount regulator, FIG. 4 is a sectional view showing an oil amount adjustment part of a conventional oil amount regulator, and FIG.
The figure is a characteristic diagram showing the change in outflow amount with respect to temperature between the embodiment of the present invention and the conventional example. 1... Oil amount regulator body, 2... Oil chamber, 3... Outlet, 4... Cylindrical guide body, 5... Valve rod, 7...
Outflow regulating hole, 10... Coil spring, 11
... Adjustment screw, 12 ... Cap, 13 ... Weir, 131 ... Small diameter hollow cylindrical part of weir, 132
...large-diameter hollow cylindrical part of the weir, 14...lid.

Claims (1)

[Scope of utility model registration request] A hollow cylindrical guide body having an outlet is erected in an oil chamber in which a constant oil level is maintained, and a hollow cylindrical valve rod is arranged to be movable up and down using the inner wall of the cylindrical guide body as a guide. A flow rate regulating hole extending in the axial direction of the valve rod is bored, and fuel oil is supplied to the outlet while adjusting the flow rate of oil by the opening area of the flow rate regulating hole facing the oil chamber. In the oil flow regulator, there is a small diameter weir inside the valve rod, which has a distance from the inner wall of the valve rod, and further terminates above the flow rate regulating hole and below the oil level of the oil chamber. An oil amount regulator characterized in that a hollow cylindrical part is inserted through the valve rod, and a large-diameter hollow cylindrical part is integrally provided at the lower part of the small-diameter hollow cylindrical part, and is fitted into the inner wall of the valve rod. .