JP3602492B2 - Water pump for boiler - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a feed pump for a steam motor, which is particularly suitable for a boiler for generating power.
[0002]
[Prior art]
The boiler for power generation uses a high pressure and temperature of steam, and the control of the amount of water supplied to the boiler in response to a change in load uses complicated numerical information related to evaporation and combustion control. It is performed by various control techniques.
Once-through boilers are suitable for small-scale equipment because the starting time is short and the structure is simple. However, unless water equivalent to the required amount of evaporation for the load is accurately controlled and supplied, fluctuations in the amount of evaporation and pressure are large, and the stability of output is low. In addition, problems such as abnormal overheating of the water pipe due to boiler empty heating and the like occur. In order to overcome this, it is necessary to provide a water flow control device similar to that of a large plant, and the water flow control is a barrier to realizing a small-scale steam power plant for consumer use.
[0003]
Further, a pump for pumping water to be supplied to the boiler (a liquefied gas such as chlorofluorocarbon is not limited to water as long as it is a heat engine that is handled in two phases of gas and liquid) is directly connected to an output prime mover. The driven form is said to be the simplest in structure and has high durability. However, in this structure, the amount of supplied water must be controlled according to the magnitude of load and load fluctuation.
If a pump that pumps a fixed amount of water per rotation of the prime mover is directly connected to the prime mover, the amount of supplied water does not correspond when a change in load occurs. Driving is difficult.
That is, when the load suddenly decreases, the rotation speed of the prime mover rises rapidly and the amount of water supplied per unit time also increases, so that the output reduction control at the boiler temperature is not in time and sufficient evaporation If you have the ability As the boiler pressure rises The rotation speed of the prime mover rises for a while and becomes uncontrollable due to the rotation speed exceeding the specified rotation speed, and energy loss occurs due to the operation of the steam safety valve.In the next stage, the boiler temperature decreases and the water supply If the prime mover is rotating at high speed due to inertia even though the evaporation capacity is relatively large and the evaporating capacity is reduced, the pump continues to supply water corresponding to the rotational speed of the prime mover, and the inside of the boiler and prime mover is saturated. The entire system is stopped by being flooded with water.
On the other hand, when the load suddenly increases, only the amount of water corresponding to the number of revolutions of the prime mover is supplied to the boiler. If the boiler rises more than the specified range and adversely affects the prime mover, the output decreases and the rotational speed of the prime mover decreases, and the boiler is in an empty state, which may cause danger. Further, since the required amount of steam is not generated, the amount of supplied water is further reduced due to a further decrease in the rotation speed, and as a result, the output is further reduced, the load cannot be followed, and the motor stops.
[0004]
[Problems to be solved by the invention]
The present invention automatically controls the amount of water supplied to a pump for supplying water to a boiler or the like of a prime mover in accordance with the rotational speed of the prime mover due to a load. The engine output is compensated, and when the rotation speed increases due to low load, the amount of water supply decreases so that the engine output can be reduced, and the above problem is solved without controlling the rotation speed of the water supply pump by a complicated control device. In addition, a predetermined rotation speed and output can be stably taken out.
The present invention has the simplest structure and is effective when the prime mover and the water supply pump are directly connected, but the prime mover and the water supply pump may be driven by different powers without being directly connected.
The `` direct connection '' means that the feedwater pump is connected via the output rotation shaft of the prime mover, the crank, and the speed reducer, and the rotation speed of the feedwater pump is proportional or synchronized with the rotation speed of the prime mover, and the rotation ratio does not change. It is said.
If the motor is not of the direct connection type, the rotation speed of the motor driving the pump is controlled by the rotation speed of the prime mover so that the rotation speed of the pump changes in accordance with the rotation speed of the prime mover. Means for controlling the speed of the pump by changing the speed reduction ratio of the speed reducer interposed therebetween in accordance with the speed of the prime mover may be considered.
[0005]
[Means for Solving the Problems]
The water supply pump for a boiler according to the present invention is provided with a pump plunger having a control piston and a pump piston mounted in a cylinder, and the pump plunger reciprocates to suction and discharge water together with the action of a check valve. In the pump, a spring for moving the pump plunger to the water suction side and an operation member for moving the water to the water discharge side are provided in the cylinder, and the operation member reciprocates in accordance with the rotation of the motor. In addition, the operating member and the pump plunger can be freely separated from each other, and the spring pressure of the spring is such that when the rotation of the motor is slow, the pump plunger moves following the movement of the operating member, and the rotation of the motor Is fast enough to move the pump plunger with a delay to the movement of the operating member.
Inflow path to the inflow chamber to the cylinder , A pressure adjusting valve is additionally provided, and the cylinder has a control piston mounting portion having a large diameter and a pump piston mounting portion having a small diameter.
According to a second aspect of the present invention, a spring is disposed between a flange formed on an upper part of the pump plunger and a step of the cylinder, and the control piston has a receiving plate having a diameter smaller than the inner diameter of the cylinder; A compression ring disposed between the plate and the flange of the pump plunger, the receiving plate is provided with a through hole, and the flange is compressed when the compression ring is in close contact with the flange of the pump plunger. When the cylinder is closed by the ring and the compression ring comes into close contact with the receiving plate, a flow path is formed between the flange and the cylinder, inside the compression ring, and through holes in the receiving plate.
[0006]
FIG. 1 shows the basic principle of the present invention.
A control piston 12 is mounted on an upper portion of the cylinder 2, and the control piston 12 is urged upward by a spring 14, and a portion below the control piston 12 is an inflow chamber 26.
The control piston 12 is forcibly moved downward by an operating member that reciprocates at a speed corresponding to the rotation of the prime mover, and is raised by the force of a spring 14. This spring force is determined in consideration of the pressure of the flowing water and the cycle of the operating member.
[0007]
A pump piston 20 is attached below the control piston 12 via a pump plunger 11, and a portion below the pump piston 20 is a pump chamber.
In the figure, reference numeral 27 denotes a pressure regulating valve, and 28 to 30 denote check valves.
[0008]
[Action]
The flow of water according to the present invention will be described with reference to FIG. 1. When the control piston 12 rises, the pressure in the inflow chamber is reduced, and water flows into the inflow chamber 26. At this time, the pump piston 20 also rises and the pressure in the pump chamber is reduced, so that water flows in through the check valve 29.
When the control piston descends, the pump piston 20 also descends, so that the water in the pump chamber is supplied to the boiler via the check valve 30. The water in the inflow chamber is discharged via a check valve 28.
As described above, when the flow of water for operating the control piston is completely separated from the flow of supplied water, the generation of bubbles and cavitation in the inflow chamber may affect the water supplied to the boiler. There is no. Further, in order to operate the control piston, it is also possible to use a fluid other than water that is unlikely to cause cavitation.
[0009]
In the present invention, the pump plunger is forcibly moved in the water discharge direction according to the movement of the motor. Therefore, the water on the outlet side of the pump piston is discharged to the boiler of the prime mover. On the other hand, the movement of the pump plunger to the suction side follows the spring force and is not restricted by the movement of the operating member corresponding to the rotation of the prime mover. Therefore, when the rotation of the prime mover is slow, the pump plunger moves to its top dead center and sucks a large amount of water, but when the rotation of the prime mover is fast, the pump plunger moves to the top dead center before the pump plunger reaches the top dead center. Moves downward, the pump plunger moves downward without reaching top dead center. Therefore, the amount of water to be sucked is small, and as a result, the amount of water supplied to the boiler of the motor is reduced.
Therefore, when the rotation of the prime mover is fast, the amount of water supply per cycle decreases, and when the rotation is pushed, the amount of water supply per cycle increases, and the supply amount of water per hour is almost independent of the rotation speed of the motor. Be kept constant.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 2 shows a structure in which a plunger of a water supply pump is driven via a connecting rod attached to a crank of a motor. The motor and the water supply pump are integrally formed.
A feed pump 3 having a cylinder 2 is mounted below the steam motor 1. One end of a control connecting rod 7 of a water supply pump is mounted via a pin 5 to a crank 6 to which one end of an output connecting rod 4 of the prime mover 1 is mounted via a pin 5. The other end of the control connecting rod 7 is an enlarged portion 8 having a diameter corresponding to the cylinder. A push rod 9 is disposed below the airtight piston, and an airtight piston 10 for sealing lubricating oil and leaked steam of the prime mover is attached to an upper end of the push rod 9. 8 abuts.
[0011]
A pump plunger 11 is disposed below the push rod 9, and a control piston 12 with a check valve is attached to an upper end thereof. A plunger spring 14 is disposed between the flange 13 formed on the upper part of the pump plunger 11 and the step 2a of the cylinder 2, and urges the pump plunger 11 and the control piston 12 upward. I have. The diameter of the flange 13 is smaller than the inner diameter of the cylinder 2.
[0012]
The control piston 12 includes a receiving plate 15 having a smaller diameter than the inner diameter of the cylinder 2, and a compression ring 16 disposed between the receiving plate 15 and the flange 13 of the pump plunger 11. The receiving plate 15 has a through hole 17. The diameter of the compression ring 16 is slightly smaller than the distance between the receiving plate 15 and the flange 13.
In the above, when the compression ring 16 is in close contact with the flange 13, the cylinder 2 is closed by the flange 13 and the compression ring 16, and when the compression ring 16 is in close contact with the receiving plate 15, between the flange and the cylinder, inside the compression ring, The passage 17 is formed by the through hole 17. That is, the control piston 12 functions as a check valve in cooperation with the flange 13.
[0013]
A receiving plate 18 having a through hole 22 is attached to a lower end of the pump plunger 11, and a compression ring 19 is provided between the receiving plate 18 and a step of the pump plunger 11. The plate 18 and the compression ring 19 constitute a pump piston 20 with a check valve.
The receiving plate 18 has a smaller diameter than the inner diameter of the cylinder 2 and is slightly smaller than the distance between the receiving plate 18 and the step of the pump plunger. The operation of the pump piston 20 as a check valve is the same as that of the control piston 12 described above.
[0014]
The stroke of the control piston 12 is defined by the stroke of the push rod 9, and a stroke adjusting screw 21 is screwed into the cylinder 2 so that the top dead center of the control piston 12 can be arbitrarily adjusted. That is, when the control piston 12 is brought into contact with the lower surface of the stroke adjusting screw 21, the position of the control piston 12 ascended is determined by adjusting the position of the lower surface of the adjusting screw 21.
[0015]
The cylinder 2 has a water inlet 23 at a portion where the plunger spring 14 is disposed, a water inlet 24 with a check valve at a lower end, and an excess water outlet 25 above the control piston 12. The inside of the suction port 23 is an inflow chamber 26.
Reference numeral 27 in the drawing denotes a pressure control valve.
[0016]
Hereinafter, the operation of the pump of this embodiment will be described.
When the output connecting rod 4 of the prime mover 1 operates and the crank 6 rotates, the control connecting rod 7 operates at the same pitch as the output connecting rod 4. When the control connecting rod 7 is lowered, its movement is transmitted to the pump plunger 11 via the airtight piston 10 and the push rod 9, and this is lowered.
When the pump plunger 11 descends, the check ring is closed because the compression ring 19 of the pump piston 20 is located above the water pressure and the water below the pump piston 20 passes through the water supply port 24 to the boiler. Pumped. On the other hand, since the compression ring of the control piston 12 is located above under the water pressure, the check valve is opened, and the water below the control piston flows out through the through hole 17 to above the control piston 12. Is discharged from the surplus water discharge port 25 (see FIG. 3).
[0017]
When the output connecting rod 4 rises, no force of the connecting rod 4 acts on the push rod 9 and the pump plunger 11. Therefore, the pump plunger 11 moves up together with the control piston 12 by the force of the plunger spring 14.
At this time, the compression ring of the control piston 12 is located below and the check valve is closed, and the inflow chamber 26 is depressurized by the rise of the control piston 12, so that water passing through the pressure control valve 27 is sucked. It flows into the inflow chamber 26 through the port 23.
On the other hand, since the check valve of the pump piston 20 is open, the water in the inflow chamber flows below the pump piston 20 via the check valve (see FIG. 4).
[0018]
In the above description, the rising speed of the pump plunger 11 is determined firstly by the repulsive force of the plunger spring 14, and is independent of the rising speed of the output connecting rod 4.
That is, when the rising speed of the output connecting rod 4 is lower than the rising speed of the pump plunger 11, the pump plunger rises at the same speed as the output connecting rod 4, and the pump plunger 11 is regulated by the adjusting screw. Move the largest stroke range in the range.
At this time, the amount of water pushed out by the pump piston 20 per one stroke of the output connecting rod is the maximum.
On the other hand, when the rising speed of the output connecting rod 4 becomes faster than the rising speed of the pump plunger 11, the output connecting rod moves to a lowering step before the pump plunger 11 reaches its top dead center. At this time, since the pump plunger descends without reaching the top dead center, the amount of suction water decreases, and the amount of water pushed out by the pump piston also decreases.
[0019]
Therefore, according to the pump of this embodiment, the water supply amount per one rotation of the prime mover is changed in accordance with the change in the rotation speed of the prime mover while the pump is directly connected to the prime mover, and the proper amount of water is always supplied to the boiler. can do.
[0020]
Also, the rising speed of the pump plunger changes depending on the flow resistance of the water supplied from the suction port.
That is, when the pressure control valve 27 is throttled to add flow resistance to the water, the inflow resistance of the water flowing into the inflow chamber 26 cancels the spring force, and the rise of the pump plunger due to the spring force is reduced. Is done. As a result, the rising height of the plunger remains low, and the amount of sucked water decreases.
As a result, the control connecting rod attached to the prime mover's crank rises to a predetermined top dead center, but the pump plunger 11 rises with a delay from the movement of the control connecting rod due to the limited rising speed. When the delay of the ascending becomes large, the output connecting rod 4 moves to the descending step before the control connecting rod reaches the maximum ascending position regulated by the adjusting screw. Therefore, the stroke of the control connecting rod is reduced, and the stroke of the output connecting rod 4 with respect to one stroke of the output connecting rod 4 is reduced. Water supply will decrease.
[0021]
Said Pressure control "valve 27 As the flow resistance of water is increased by tightening the needle valve, the ascending speed of the pump plunger 11 becomes slower, so that its stroke becomes smaller, and the amount of water supply per stroke of the control connecting rod 4 further decreases.
In addition, due to the phase relationship between the top dead center of the pump plunger 11 and the starting point of the operation of the crank 6 of the prime mover 1, the energy stored in the next rotary motion increases, so that the discharge pressure of the pump increases and the higher pressure increases. It will be suitable as a water supply pump for high-speed engines.
That is, the time during which the pump plunger is operated to supply water during the entire stroke of the crank is a part of the time, and at other times, the output of the prime mover is all the work for the target load of the prime mover.
Therefore, in this device, when the load on the prime mover is reduced and the rotation speed is increased, the movement amount of the pump plunger is reduced, so that the work amount of the pump plunger with respect to the rotational momentum of the crank and, consequently, the work amount of the pump is reduced. Conversely, the amount of one rotation of the motor relative to the work of the pump is relatively increased. For example, it is possible to quickly cope with a case where the load on the prime mover suddenly increases and a large amount of high-pressure water needs to be supplied immediately.
The above Pressure control valve The same operation and effect can be obtained also by providing at the surplus water discharge port and adding flow resistance to the discharged water. In that case, it is preferable to seal the drainage because there is a possibility that the drainage may rise to the airtight piston side and leak.
[0022]
When the pump of this embodiment is used, the pump is directly connected to the prime mover, and therefore does not function as a pump unless the prime mover rotates. Therefore, when the prime mover is started, the prime mover is rotated by another power to operate the pump to supply water. If necessary, supply water with an auxiliary pump.
In the stage where the speed of the prime mover is low at the beginning of rotation, the pump plunger 11 supplies water to the boiler with the maximum stroke defined by the adjusting screw, so that the boiler is supplied with a large amount of water and the boiler is quickly filled. . When the evaporation in the boiler starts, the rotation speed of the prime mover gradually increases to the set rotation speed, and the pump operates by self-driving of the prime mover, so that the rotation of the prime mover by another power and the water supply by the auxiliary pump are unnecessary. .
[0023]
When the prime mover reaches a predetermined rotational speed, the rotational speed of the prime mover matches the stroke of the pump plunger 11 determined by an appropriate flow rate set by the pressure control valve 27 according to the load, and By the action, the amount of water supply per hour is constant, and stable operation is performed.
[0024]
Hereinafter, the automatic control of the water supply amount will be described with reference to FIGS.
5 and 6, the sine waveform shows the locus of movement of the crank of the prime mover and the control connecting rod of the pump, and the straight line shows the locus of movement of the pump plunger of the water supply pump. FIG. 5 shows that the rotation of the prime mover is fast FIG. 6 shows a state (a state in which the cycle is short, such as when the rotation speed increases due to a reduction in load), and FIG. Each of the angles PA is represented by a straight line having the same inclination (the same ascending speed) with respect to the horizontal axis (time t) with respect to the ascending speed of the pump plunger. PSM is the maximum stroke of the pump plunger and is regulated by the adjusting screw.
[0025]
In both figures, the pump plunger starts to rise at an angle PA from the bottom dead center of the sinusoidal waveform. Since its maximum stroke is the sign PSM, the pump plunger can rise to the point of PSM when the movement of the crank is slow enough.
However, it intersects with the miracle of the control connecting rod descending on the way up the pump plunger (point D). That is, after the point D, the pump plunger shifts to the lowering step. Therefore, the actual stroke of the pump plunger is PSH.
Here, when comparing the magnitudes of the PSH of FIG. 5 and the PSL of FIG. 6, the PSH of FIG. 5 showing a high-speed rotation is smaller.
That is, when the rotation period (cycle) is short (see reference numeral TH in FIG. 5) and when it is long (see reference numeral TL in FIG. 6), when the rotation speed is low and the rotation period is long, water is discharged from the water supply pump per rotation. When the amount increases and the rotation speed increases, the amount of water supply per rotation decreases, and as a result, the amount of water supplied to the boiler per unit time is controlled irrespective of the rotation speed of the motor. The Rukoto.
[0026]
For example, when the load that should be a constant load temporarily increases, the rotation speed of the prime mover moves in a decreasing direction, and the rotation cycle becomes longer. Correspondingly, the amount of water supply per cycle increases, and acts as a compensating action so as to increase the output per cycle of the prime mover and restore the rotation speed. Conversely, when the load temporarily decreases, the number of rotations of the prime mover increases and the rotation cycle becomes shorter, so that the amount of water supply per cycle decreases correspondingly, and the output of the prime mover per cycle decreases. The rotation speed is returned to the original speed by reducing the speed and applying a deceleration effect.
[0027]
The function of the water supply pump to the prime mover used for the constant speed constant load control has been described above. However, the output of the prime mover can be adjusted by adjusting the flow rate by the pressure control valve 27. When it is necessary to change the output in a continuous state, it can be used as an output control device.
[0028]
FIG. 7 illustrates the principle of output control based on the flow rate.
Reference numeral V denotes a pressure control valve for adjusting the amount of water flowing into the cylinder 2. The water controlled by the pressure control valve V flows into the cylinder 2 at a constant flow rate. Although the amount of inflow is limited by the plunger spring, the rising position of the pump plunger 11 differs depending on the magnitude of the flow rate.
That is, even if the rotation speed of the prime mover is the same and the rising time (suction time) of the pump plunger 11 is the same, when the flow rate is large, it rises to PSL in the figure, and when the flow rate is small, it rises only to PSH. As a result, a difference occurs in the amount of inflow into the cylinder 2 and a difference also occurs in the amount of water supplied to the boiler.
Therefore, when the inflow from the pressure control valve is increased, the water supply amount per stroke to the boiler is increased, and the output of the prime mover is increased. Conversely, when the inflow from the pressure control valve is decreased, the prime mover is reduced. Will decrease.
[0029]
In the above embodiment, the prime mover and the pump are hermetically sealed by the hermetic piston, but a diaphragm may be used instead of the piston ring.
Further, although the control piston attached to the pump plunger is provided with a check valve in combination with a compression ring, an outlet provided with another check valve from the inflow chamber to the outside may be provided. According to the structure of the embodiment, the structure is extremely simple and the operation is light. The same applies to the pump piston.
[0030]
As the diameter of the cylinder of the feed water pump becomes smaller with respect to the displacement of the steam motor, the degree of decompression in the cylinder when the plunger is pulled up by the force of the pump plunger spring increases, and the plunger spring pulls up the pump plunger. (Spring force / cylinder cross-sectional area = negative magnitude) becomes large.
[0031]
As a result, a state close to a vacuum occurs when water is sucked into the pump cylinder, and when the rotation speed of the prime mover is extremely large (3,000 rpm to 6,000 to 10,000 rpm), the water directly flows into the pump cylinder. Squeezing water on the inflow side is the same as raising the pump head very high from the water surface, cavitation and air bubbles are likely to occur, and water supply becomes unstable due to reduced suction capacity and discharge volume. There is a danger that the engine will stop without water being supplied to the boiler.
[0032]
However, if the area of the control piston is increased and the degree of pressure reduction in the inflow chamber is reduced (return force (spring force) of the control piston / piston area = negative magnitude decreases), the inflow chamber and the pump cylinder Both are less likely to cause instability.
In addition, even when water and the like regenerated by the high-temperature condenser are handled, vaporization and generation of bubbles are prevented.
[0033]
【Example】
FIG. 8 shows an example of an experimental model in which the present invention is used as a water supply pump for a steam motor of a steam power plant. The pump 3 is submerged in a water tank 39.
In addition to the pump, the motor 1 includes a motor 31 linked to the output shaft of the motor by a belt (not shown), and heats a spiral single-tube boiler with an alcohol lamp, a gas burner, or the like to generate power by operating the motor. It can also be used for practical power generators.
In this experimental model, power is supplied to the motor 31 by the changeover switch 32 when heat is applied to the boiler 40 after the water is poured into the water tank 39 (or heat may be used instead of thermal power), and the motor 31 is used as a starter motor. 1, the pump 3 is operated to supply water. At this time, in order to speed up the water supply to the boiler, another water supply pump can be operated to supply water in addition to the water supply by the water supply pump 3 of the present invention.
When the generation of steam in the boiler 40 starts, the steam motor 1 starts rotating by itself.
Subsequently, when the changeover switch 32 is neutralized when the steam motor 1 reaches an appropriate rotation speed, the rotation of the motor 31 stops, and the motor 1 rotates by itself under no load. Next, when the changeover switch 32 is switched to the load side when the rotation becomes sufficiently fast, the motor 31 functions as a generator. At this time, the load on the prime mover instantaneously increases and the rotation decreases.
When the rotation speed of the prime mover decreases, the amount of steam consumed by the prime mover decreases, while the amount of water supplied to the pump per rotation of the prime mover increases. Therefore, the amount of water in the boiler increases and the amount of generated steam also increases, so that the steam pressure increases. As a result, the rotation speed is soon restored, and power generation is continued.
[0034]
In the figure, reference numeral 33 denotes a water supply filter, 34 denotes a filter for draining excess water of a water supply pump, 35 denotes a pressure relief valve, 36 denotes a economizer, 37 denotes a return pipe to a condensate water tank, and 38 denotes an exhaust steam outlet.
Here, the water is supplied from the water supply filter 33, enters the water supply pump 3 via the pressure regulating valve 27, and the excess water returns from the drainage filter 34 to the water tank.
The water of the pump 3 passes through the check valve, passes through the pressure relief valve 35, and flows into the upper part of the economizer 36 through which the exhaust steam of the steam motor passes. To the boiler 40.
[0035]
【The invention's effect】
According to the present invention, the amount of water to be changed by increasing or decreasing the load on the prime mover is automatically supplied to the boiler in the next cycle in response to each rotation cycle of the prime mover, so that feedback control using various sensors is performed. Rather than operating various control devices, it is possible to perform highly reliable water supply control with high responsiveness and a simple structure, as well as rotation control and output control of the prime mover based on the water supply.
Further, according to the present invention, the output of the prime mover (the torque and the number of revolutions of the prime mover) can be controlled by complexly adjusting the stroke of the pump plunger and the flow rate to the cylinder.
[0036]
Also, in addition to the water supply pump, a piston with a larger diameter is provided to adjust the amount of water flowing into the cylinder of the water supply pump, thereby controlling the stroke of the pump piston and reducing the pressure reduction effect of the inflow chamber. In addition, a pump capable of high-speed operation in which cavitation and bubbles are less likely to be generated can be provided.
Further, the present invention enables a plant with an automatic output control function that can operate on its own using only mechanical elements without using other electrical control circuits and the like, for example, a home power generation device using a steam motor.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of the present invention.
FIG. 2 is a sectional view of an embodiment of the present invention.
FIG. 3 is an enlarged cross-sectional view showing the same suction step.
FIG. 4 is an enlarged sectional view showing a water supply step.
FIG. 5 is a diagram showing the relationship between the movement of the crank and the pump plunger.
FIG. 6 is a diagram showing the relationship between the movement of the crank and the pump plunger.
FIG. 7 is a sectional view showing the movement of the pump plunger.
FIG. 8 is a diagram showing an embodiment of the present invention.
[Explanation of symbols]
1 prime mover
2 cylinders
3 pump
4 Output connecting rod
5 pin
6 cranks
7 Control connecting rod
8 Enlargement
9 Push rod
10. Airtight piston
11 Pump plunger
12 Piston for control
13 Flange
14 Spring
15 Receiving plate
16 Compression ring
17 Through-hole
18 Receiving plate
19 Compression ring
20 pump piston
21 Adjustment screw
22 Through-hole
23 Suction port
24 water inlet
25 outlet
26 Inflow chamber
27 Pressure control valve

Claims (2)

A pump in which a control piston and a pump plunger to which a pump piston is attached is mounted in a cylinder. The pump performs suction and discharge of water together with a check valve by reciprocating movement of the pump plunger.
A spring for moving the pump plunger to the water suction side and an operation member for moving the water to the water discharge side are provided in the cylinder, and the operation member reciprocates in accordance with the rotation of the prime mover. At the same time, the actuating member and the pump plunger can be freely attached and detached,
When the rotation of the prime mover is slow, the pump plunger moves following the movement of the operating member, and when the rotation of the prime mover is fast, the pump plunger moves with a delay to the movement of the operating member. Of such a size,
A pressure regulating valve is attached to the inflow path to the inflow chamber to the cylinder,
The cylinder has a control piston mounting portion with a large diameter, and a pump piston mounting portion with a small diameter, a boiler feed pump. A spring is arranged between the flange formed at the top of the pump plunger and the step of the cylinder,
The control piston includes a receiving plate having a diameter smaller than the inner diameter of the cylinder, and a compression ring disposed between the receiving plate and the flange of the pump plunger.
The receiving plate is provided with a through hole,
When the compression ring comes into close contact with the flange of the pump plunger, the cylinder is closed by the flange and the compression ring, and when the compression ring comes into close contact with the receiving plate, between the flange and the cylinder, inside the compression ring, on the receiving plate. The flow path is formed by the through hole of
The feed pump for a boiler according to claim 1.

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