JPH04111A - Flow rate adjusting valve in combustion amount variable device - Google Patents

Abstract

PURPOSE:To cause the variation of returned oil amount proportional to a pressure to be also proportional to an applied pressure and perform an accurate combustion control by a method wherein a relation between the applied current of a solenoid and a pressure at a flowing-in side of a valve seat is kept in a proportional relation by applying a spherical valve member. CONSTITUTION:A flow rate adjusting flow passage 43 is formed at an upper part of a valve casing 40, a valve member advancing or retracting mechanism K is disposed below it. A valve advancing or retracting rod 47 is provided with an air discharging longitudinal groove 69. As a device is operated, kerosene flows into the air flowing-out longitudinal groove 69 and the air is flowed out completely from a pressure atomization nozzle N through a return oil pipe R and a going oil pipe S together with kerosene because of its buoyancy. Accordingly, a switch at in operating part is operated in response to a required thermal load of the device to send a control signal, and then a desired current is applied to a solenoid 51 through a flow rate adjusting valve driving circuit under an operation of a control device. A valve advancing or retracting rod 47 and a spherical valve 45 supported by the rod 47 are integrally advanced or retracted so as to perform an accurate flow rate adjustment and thus an accurate combustion control can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a flow rate regulating valve for a variable combustion rate device used in domestic oil water heaters and the like.

(B) Prior Art Conventionally, as shown in FIG. 7, as one form of this type of oil combustion device, kerosene is guided from a kerosene tank 70 to an outgoing oil pipe 71 through a strainer 71a by a throat difference.
Pressurized by pump 72 and return type pressure spray nozzle 73
There is a configuration in which the kerosene is supplied to the kerosene and sprayed from the tip of the nozzle 73, and a part of the kerosene passes through the return oil pipe 74 and is returned to the upstream side of the pump 72 of the outgoing oil pipe 71 via the flow rate adjustment valve 75.

With this configuration, this oil combustion device has a return oil pipe 7.
By changing the valve opening degree of the flow rate adjustment valve 75 provided at 4 and adjusting the amount of return oil, the amount of spray can be controlled over a wide range and the amount of combustion can be changed.

That is, the kerosene supply amount Qa supplied from the pump 72 to the return type pressure spray nozzle 73 is equal to the spray amount Q8 from the return type pressure spray nozzle 73, the return oil pipe 74, and the outgoing oil pipe 71.
Since the amount of return oil that returns to the upstream side of The spray amount Q can be adjusted.

Conventionally, the above-described flow rate adjustment valve 75 has a flow rate adjustment flow path formed in the valve casing, in which the - side opening is connected to the upstream side of the return oil pipe, and the other side opening is connected to the downstream side of the return oil pipe. A valve seat is provided in the middle of the flow rate adjustment flow path, and a needle-shaped valve body is brought into contact with the valve seat so as to be able to freely come and go, so that the flow rate adjustment flow path can be opened and closed. , a valve body advancing/retracting lever driven by a solenoid is provided, and by making the current applied to the solenoid variable, the amount of movement of the valve body advancing/retracting lever can be finely adjusted.

Then, by changing the voltage applied to the solenoid, the valve body advancing/retracting rod and the needle-like valve body attached to its tip move forward and backward toward the valve seat, adjusting the opening of the valve seat, and adjusting the valve seat opening on the inflow side of the valve seat. By changing the pressure P2, the return oil amount Q is changed, and the spray amount Q is
,of! l1wi can be done.

In addition, in FIG. 7, 76 is a check valve provided in the middle of the return oil pipe 74.

(c) Problems to be Solved by the Invention However, such oil combustion devices still have the following problems to be solved.

That is, in the above configuration, since the valve body is formed by a needle-like valve body, the applied current and the pressure P2 on the inflow side of the valve seat are
It is not possible to secure a proportional relationship between the parties.

Therefore, the change in the return oil amount QIl, which is proportional to the pressure P2, also becomes unstable, making it impossible to perform accurate combustion control.

An object of the present invention is to provide a novel combustion amount variable device that can solve the above-mentioned problems.

(d) Means for Solving the Problems The present invention supplies kerosene pressurized by a pump to a return type pressure spray nozzle through a forward oil pipe, and also provides a flow rate adjustment valve in the middle of the return oil pipe. By controlling
In the combustion amount variable device that can change the combustion amount by increasing or decreasing the amount of spray from the nozzle, a flow rate adjustment flow path is formed in the upper part of the valve casing, a valve seat is provided in the middle of the flow rate adjustment flow path, A spherical valve body is movably brought into contact with and separated from the valve seat to freely open and close the flow rate adjustment flow path, and a valve body advancing/retracting rod driven by a solenoid is disposed below the spherical valve body.
By making the applied current to the solenoid variable,
This invention relates to a flow rate regulating valve in a combustion amount variable device, which is capable of finely adjusting the amount of movement of a valve body advancement/retraction rod, and further includes a longitudinal groove for air outflow provided on the circumferential surface of the valve body advancement/retraction rod.

(E) Actions and Effects With the above-described configuration, the present invention provides the following actions and effects.

■Since a spherical valve body is used as the valve body, a proportional relationship can be ensured between the applied current and the pressure on the inflow side of the valve seat.
The return oil amount, which is proportional to the pressure, also changes in exact proportion to the applied current, making it possible to perform accurate combustion control.

■In addition, a flow rate adjustment flow path is provided in the upper part of the valve casing, and a vertical groove for air outflow is provided on the surface of the valve body advancement/retraction rod located below the flow path, so that air remains in the valve body advancement/retraction mechanism including the solenoid. The air can be effectively floated, mixed into the kerosene, and then discharged from the return type pressure spray nozzle.

Therefore, it is possible to eliminate inaccuracies in flow rate adjustment caused by air inclusion before the start of operation or at the time of restarting operation after maintenance of the flow rate adjustment valve, and more accurate combustion control can be performed.

(f) Examples The present invention will now be explained in detail based on examples shown in the accompanying drawings.

FIG. 1 conceptually shows the overall configuration of an oil-powered water heater B incorporating a combustion amount variable device A according to the present invention.

First, to explain the configuration of the variable combustion amount device A, in FIG. 1, T is an oil storage tank filled with kerosene;
From the same oil storage tank T, through the filter F1, the outgoing oil pipe S
The kerosene that has flowed into and fallen inside is pressurized by the pump P and is supplied to the return type pressure spray nozzle N.

As shown in FIG. 2, the return type pressure spray nozzle N has a jet flow path 10 and a return flow path 1 formed therein.
A portion of the kerosene supplied to the return type pressure spray nozzle N through the outgoing oil pipe S is atomized and jetted out from the tip nozzle opening 12, and the remainder of the kerosene passes through the return flow path 11 to the return oil pipe R, which will be described later. It will be refluxed to

That is, in FIG. 1, the return oil pipe R is provided in parallel with the outgoing oil pipe S.

The return oil pipe R has one end connected to the return passage 11 of the return type pressure spray nozzle N, and the other end connected to the upstream side of the pump P of the outgoing oil pipe S. , forming a circulation flow path C.

Moreover, a flow rate adjustment valve FC, a filter F2, and a check valve G are installed in series in the middle of the return oil pipe R.

Then, by controlling the flow rate adjustment valve FC, the amount of return oil can be adjusted to tA, the amount of spray from the return type pressure spray nozzle N can be increased or decreased, and the amount of combustion can be changed.

Furthermore, a check valve G provided midway through the outgoing oil pipe S prevents kerosene from flowing back into the return type pressure spray nozzle N through the return oil pipe R when the electromagnetically operated pump P is stopped.

Furthermore, the filter F2 can remove fine impurities contained in the kerosene flowing into the flow rate regulating valve FC, and ensure reliable operation of the flow rate regulating valve FC.

In addition, in FIG. 1, QT is the amount of kerosene supplied from the pump P to the return type pressure spray nozzle N, Q is the amount of spray from the return type pressure spray nozzle N, and Q is the amount of kerosene that passes through the return oil pipe R. This is the amount of oil returned.

Next, the configuration of the petroleum-type hot water heater@B will be explained with reference to FIG.
0 is connected to a fan 22 via a duct 21 at its rear.

Further, a damper 23 is disposed within the duct 21 to adjust the amount of combustion air supplied.

A heat exchanger 24 is disposed below the gun type burner 20, and the water supply side of the heat exchanger 24 is connected to a water supply pipe 25, and a water flow sensor 26 is connected to the water supply pipe 25.
and a water temperature sensor 27 are attached.

On the other hand, a flow rate regulating valve 29 and a hot water temperature sensor 30 are attached to a hot water supply pipe 28 connected to the hot water supply side of the heat exchanger 24 .

Further, a bath pipe 31 can be branched from the hot water supply pipe 28, and in this case, a bath water amount sensor 32 and a shutoff valve 33 are installed.

The present invention provides the combustion amount variable device A having the above configuration or the same combustion amount variable device A! In the petroleum water heater B equipped with the variable device A,
As shown in Fig. 1 and Fig. 3, inside the flow rate regulating valve FC,
It is characterized in that the terminal end of the return oil pipe R is disposed at a location where the terminal end of the return oil pipe R is connected to the upstream side of the outgoing oil pipe S.

That is, in FIG. 3, a valve casing 40 is composed of two divided bodies 40a and 40b and forms a long cylindrical body.
is provided with a communication channel 43a horizontally penetrating the upper part of the divided body 40a.

One side opening 43b of this communication channel 43a is connected to the first opening 43b.
As shown in the figure, it connects to the upstream side of the outgoing oil pipe S.
The other side opening 43c communicates with the downstream side of the outgoing oil pipe S.

On the other hand, a nipple 43d is attached to the upper surface of the valve casing 40 as shown in FIG.
The return oil flow path 43e provided in d is connected to the middle of the communication flow path 43a via a valve seat 44, which will be described later, to form a flow rate adjustment flow path 43 consisting of an L-shaped bent flow path. There is.

One side opening 42 of the flow rate adjustment flow path 43 is connected to the upstream side of the return oil pipe R, that is, to the return type pressure spray nozzle N side.

Further, a valve seat 44 is provided in the middle of the flow rate adjustment channel 43, and an example of the valve seat 44 includes a spherical valve body 45.
The valve seat 44 is arranged so as to be able to come into contact with and separate from the valve seat 44.

In this way, as described above with reference to FIGS. 1 and 3, in this embodiment, the flow rate control valve FC is installed at the point where the terminal end of the return oil pipe R is connected to the upstream side of the outgoing oil pipe S. In addition, the flow rate adjustment valve FC includes a communication passage 43a that connects the upstream side and the downstream side of the outgoing oil pipe S, and a flow rate adjustment passage 43 that connects the terminal end of the return oil pipe R to the middle of the communication passage 43a. has been established.

Therefore, the outgoing oil pipe S, the return oil pipe R, and the flow rate regulating valve FC can be connected all at once at the installation location of the flow rate regulating valve FC without using any connecting fittings such as a cheese, making piping work extremely easy and inexpensive. can be done.

Further, in this embodiment, a valve body driving mechanism K is provided at the side of the spherical valve body 45 facing the valve seat 44, that is, at the bottom of the valve casing 40. It has a configuration.

The spherical valve body 45 is fitted into a circular groove 48 provided at the tip of a valve body movement rod 47 that moves back and forth on the axis of the valve casing 40 described above.

On the other hand, the base end portion of the valve body advancing/retracting rod 47 is disposed within the other side divided body 40b of the valve casing 40, and
The solenoid 51 is configured by winding a coil 50 around the solenoid 51. The solenoid 51 is arranged so as to be movable forward and backward within a long hole 52 formed in a guide sleeve 46 provided at the center.

Then, by applying a current to the solenoid 51, the valve body advancing/retracting rod 47 is moved forward and backward along the axis, and the spherical valve body 45 fitted into the tip of the valve body advancing/retracting rod 47 is moved toward and away from the valve seat 44. Therefore, the amount of return oil flowing through the return oil pipe R can be adjusted.

Furthermore, as shown in FIGS. 3 and 4, the valve body advancement/retraction rod 4
7 is provided with air outflow vertical grooves 69 having a sufficient width W and depth D on both sides thereof.

The air outflow vertical groove 69 can effectively prevent air from staying inside the valve body advancing/retracting mechanism, as will be described later.

Further, as shown in FIG. 3, the flow rate adjustment valve FC has a forward/retractive force adjusting mechanism 6 for adjusting the advancing/retracting force of the valve body advancing/retracting rod 47.
0.

The advance/retreat force adjustment mechanism 60 includes a cylindrical nut 61 provided on the rear end surface of the valve casing 40, a screw punch 62 is screwed onto the nut 61, and the tip of the screw punch 62 is inserted into the guide sleeve 4.
6, and inside the cylindrical nut 61, the spring receiver formed at the upper end of the screw punch 62 is connected to the plate 63, and the spring receiver formed at the lower end of the valve rod 47 is connected to the plug 64. A spring 65 is interposed therebetween, and the rear end 61a of the cylindrical nut 61 is fixedly connected to the bottom plate of the other divided body 40b of the valve casing 40 by caulking.

With this configuration, by rotating the screw punch 62 by a desired means, it moves forward and backward in the axial direction of the valve casing 40, and by moving forward and backward, the forward and backward force of the valve body movement rod 47, that is,
The force separating the spherical valve body 45 from the valve seat 44 can be adjusted.

Next, the operation of the flow rate regulating valve FC having the above configuration will be explained with reference to FIGS. 5 and 6.

First, at the start of operation of the oil combustion equipment or the flow rate adjustment valve F
At the time of restarting operation after maintenance of C, air will remain in the air outflow vertical groove 69 formed in the valve body advancing/retracting mechanism.

However, in the present invention, as described above, the valve casing 4
0, a flow rate adjustment channel 43 is formed in the upper part of the oil combustion equipment, and a valve body advancing/retracting mechanism K is disposed in the lower part thereof, and the valve body advancing/retracting rod 47 is provided with an air outflow vertical groove 69, so that the operation of the oil combustion equipment is improved. Upon restart, the kerosene flows into the air outflow vertical groove 69, and the air moves upward due to its buoyancy, and together with the kerosene, it completely flows out from the return type pressure spray nozzle N through the return oil pipe R and the outgoing oil pipe S. be able to.

Therefore, the flow rate adjustment valve FC can accurately and precisely adjust the flow rate of kerosene in the manner described below, and can perform accurate combustion control.

That is, according to the required heat load of water heater B, a control signal is sent to the control device by operating a switch on an operation section (not shown).
The control device applies a desired current to the solenoid 51 through the flow rate adjustment valve drive circuit, moves the valve body advancement/retraction rod 47 and the spherical valve body 45 supported thereto integrally, and accurately adjusts the flow rate. It is possible to perform accurate combustion control.

In addition, in this embodiment, since the spherical valve body 45 is used as the valve body, as shown in FIG. The correlation with P2 can be changed approximately linearly.

On the other hand, the secondary side pressure P2, the return oil amount Q that passes through the return oil pipe R and returns to the upstream side of the outgoing oil pipe S, and the spray amount Q from the return type pressure spray nozzle 53, (kerosene supply amount QT - oil amount Q ,)
There is a linear correlation shown in FIG.

Therefore, in this embodiment, by finely adjusting the applied current (2), the return oil amount Q5, that is, the spray amount QN, can be linearly and accurately changed, and combustion control can be performed accurately.

Further, as described above, in this embodiment, the valve body advancement/retraction rod 47
has an automatic centering function, so the valve seat 44 and the spherical valve body 45
Since the distance from the spherical valve body 45, that is, the valve opening degree, can be accurately controlled, more accurate combustion control can be performed in conjunction with the effect of the spherical valve body 45 described above.

[Brief explanation of drawings]

The first part is a conceptual configuration diagram of an oil-powered water heater equipped with a combustion rate variable device equipped with a flow rate regulating valve according to the present invention, and the second part is
The figure is a cross-sectional side view of the return type pressure spray nozzle, Figure 3 is a cross-sectional front view of the flow rate regulating valve, Figure 4 is a cross-sectional view taken along the line 1-1 in Figure 3, and Figure 5 is the relationship between the applied current and the flow rate regulating valve. A graph showing the correlation between the secondary side pressure, Fig. 6 is a graph showing the correlation between the secondary side pressure of the flow rate adjustment valve, the return oil amount and the spray amount, and Fig. 7
The figure is a conceptual configuration explanatory diagram of a conventional combustion amount variable device. In the diagram, A: Combustion amount variable device B: Petroleum water heater C: Circulation flow path FCC original flow rate adjustment valve: Check valve N: Return type pressure spray nozzle S: Outgoing oil pipe P: Pump R: Return oil pipe T: Oil storage Tank 40: Valve casing 41 One side opening 42: Other side opening 43: Flow rate adjustment flow path 43a: Communication flow path 44: Valve seat 45: Spherical valve body 47: Valve body movement rod 51: Solenoid 69: Vertical for air outflow groove

Claims (1)

[Claims] 1. Kerosene pressurized by a pump (P) is supplied to a return type pressure spray nozzle (N) through an outgoing oil pipe (S), and a flow rate adjustment valve ( A combustion amount variable device that can change the combustion amount by increasing or decreasing the amount of spray from the nozzle (N) by controlling the flow rate adjustment valve (F), which includes: a valve casing (40); A flow rate adjustment flow path (43) is formed in the upper part, and a valve seat (44) is formed in the middle of the flow rate adjustment flow path (43).
A spherical valve body (45) is provided in the valve seat (44) so as to be able to freely come into contact with and separate from the valve seat (44) to freely open and close the flow rate adjustment channel (43), and a solenoid is provided below the spherical valve body (45). (51) is provided, and a vertical groove (69) for air outflow is provided on the side of the valve body advancement/retraction lever (47).
A flow rate adjustment valve in a combustion amount variable device, characterized in that it is provided with a combustion amount variable device.