JPH0942187A - Priming device for feed water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a priming device for a feed water pump not to need a steam separator. SOLUTION: An air-assist part 20 for drawing outside air is provided in some part from a rotary vane pump 1 to its discharge port 9. The air assist part 20 is formed of small outside air drawing holes provided on the suction side of the rotary vane pump 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a priming device for a water supply pump that drives a rotary vane pump using a self-lubricating vane to prime the water supply pump.

[0002]

2. Description of the Related Art When using a feed water pump such as a centrifugal pump or a turbine pump used for a pumping pump, a fire pump, etc., it is necessary to first perform so-called "priming" using a priming device.

The priming using the priming device is performed by degassing the inside of the water supply pump by the suction action of the rotary vane pump and sucking up the water. Therefore, water may flow into the rotary vane pump, and the vane of the rotary vane pump may be broken due to water compression due to rotation of the rotary vane pump, liquid hammer phenomenon, or the like.

This phenomenon will be described with reference to the rotary vane pump 1 shown in FIGS. The rotary vane pump 1 has a structure in which a rotor 3 is eccentrically and rotatably provided in a pump case 2, and vanes 5 are slidably incorporated in respective grooves 4 radially provided in the rotor 3. . A pipe 6 connected to the inside of the water feed pump is connected to the suction side of the rotary vane pump 1, and a discharge pipe 7 is connected to the discharge side.

Such a rotary vane pump 1 is
When the rotary vane pump 1 is driven by an engine (not shown), the inside of the water supply pump (not shown) is deaerated by the suction action due to the volume change of the space surrounded by the vane 5, the rotor 3, and the pump case 2 accompanying the rotation of the rotor 3 Water will be sucked up into the pump.

In such a rotary vane pump 1, 100 parts of water is stored in the rotary vane pump 1 due to the resistance of the diaphragm type water shutoff valve, check valve, strainer, etc. connected to the discharge passage from the water feed pump to the rotary vane pump 1. %, The vane 5 of FIG.
A vacuum space is formed in the expansion chamber 8 formed by the rotor 3 and the pump case 2. Therefore, as shown in FIG. 10 (B), at the moment when the rotor 3 rotates and the discharge port 9 communicates with the expansion chamber 8, the water in the discharge port 9 and the discharge pipe 7 instantly flows backward to expand the expansion chamber 8. Then, the vane 5 may be broken due to the impact of the water compressed by the rotation of the rotor 3 and the liquid hammer phenomenon.

For this reason, the material forming the rotary vane pump 1, including the vane 5, needs to be strong, and is mainly a metal material. Therefore, lubricating oil was required.

However, in the rotary vane pump 1 using the lubricating oil, the water mixed with the oil is discharged at the time of priming, which causes a problem of polluting the environment.

Therefore, a priming device using a rotary vane pump 1 incorporating a vane 5 having a self-lubricating property such as a carbon material has been proposed. Rotary vane pump 1 using vanes 5 having such self-lubricating property
, The vane 5 has a self-lubricating property, so that the lubricating oil is unnecessary.

However, in the priming device in which the vane 5 is made of a weak material such as a carbon material having self-lubricating property, the rotary vane pump 1 is used.
If water enters the inside of the vane, the vane 5 may be destroyed due to compression of the water, a liquid hammer phenomenon, or the like. Therefore, it is necessary to add a protection means for the vane 5.

FIG. 11 shows the structure of a priming device for a conventional water supply pump of this type to which a protection means for the self-lubricating vane 5 is added.

The water supply pump 10 discharges the water supplied from the water suction port 11 through the discharge port 13 of the discharge valve 12.

A priming device 14 for priming such a water supply pump 10 has a structure mainly composed of a rotary vane pump 1. The rotary vane pump 1 is connected to a discharge passage 15 of a water supply pump 10 by a pipe 6. A strainer 16 and a steam separator 17 having a float valve 30 that closes the discharge side passage when water flows in are connected in the middle of the pipe 6, and the pipe 6 is connected to a water supply pump 10 via a check valve 18. It is connected to the discharge passage 15. The discharge passage 15 is opened by negative pressure due to suction of the rotary vane pump 1 at the time of priming, closed when the rotary vane pump 1 is stopped, and water flows to the rotary vane pump 1 side when the water suction port 11 has a positive pressure. A diaphragm type water shutoff valve 19 for preventing the above is provided.

In such a priming device 14, a steam / water separator 17 is provided in the middle of the pipe 6, and even if the priming water enters the pipe 6, it is separated by the steam / water separator 17 and is fed to the rotary vane pump 1. The water does not flow into the vane 5, so that the vane 5 can be prevented from being broken due to water compression or a liquid hammer phenomenon.

[0015]

However, FIG.
Since the priming device 14 of the water supply pump having the structure shown in FIG. 1 requires the steam / water separator 17, it becomes a large-scale device, and there is a problem that the steam / water separator 17 and the like disturb the complete priming operation. there were.

An object of the present invention is to provide a priming device for a water feed pump which does not require a steam separator.

[0017]

DISCLOSURE OF THE INVENTION The present invention is directed to a priming device for a water supply pump which drives a rotary vane pump using a self-lubricating vane to discharge the air in the water supply pump to the outside to prime the water supply pump. Are targeted for improvement.

In the priming device for a water supply pump according to the present invention, an air assist portion for sucking outside air is provided at any portion from the suction side of the rotary vane pump to the discharge port of the rotary vane pump. And

In the present invention, the suction side of the rotary vane pump refers to the portion from the outlet of the discharge passage of the water feed pump to the inlet of the rotary vane pump.

As described above, when an air assist portion for sucking the outside air is provided at any portion from the suction side of the rotary vane pump to the discharge port of the rotary vane pump, a certain amount of air is supplied from the air assist portion. Since the priming water enters the expansion chamber, the negative pressure in the expansion chamber decreases. Therefore, when the discharge port of the rotary vane pump communicates with the expansion chamber, the amount and speed of water flowing back from the discharge port into the expansion chamber can be suppressed. Further, since there is air in the expansion chamber, it is possible to reduce the impact force of water applied to the vane due to the damper effect of the air, and thus it is possible to prevent the self-lubricating vane from being destroyed.

Therefore, in the priming device of the water supply pump having such a structure, the steam separator is not required even if the rotary vane pump using the self-lubricating vane is used.
A complete priming operation can be performed, the device can be downsized, and the cost can be reduced. Further, if the destruction of the self-lubricating vane can be prevented, the thickness of the vane can be reduced, and therefore, the rotary vane pump can be downsized.

Further, the priming device for the water supply pump according to the present invention is characterized in that the rotary vane pump is provided with an air assist portion for sucking the outside air on the suction side. When the air assist portion for sucking the outside air is provided on the suction side of the rotary vane pump in this way, a certain amount of air enters the expansion chamber of the rotary vane pump, so that the priming water enters the expansion chamber. At this time, the negative pressure in the expansion chamber drops. Therefore, when the discharge port of the rotary vane pump communicates with the expansion chamber, the amount and speed of water flowing back from the discharge port into the expansion chamber can be suppressed. Further, since there is air in the expansion chamber, it is possible to reduce the impact force of water applied to the vane due to the damper effect of the air, and thus it is possible to prevent the self-lubricating vane from being destroyed.

Therefore, in the priming device of the water supply pump having such a structure, the steam separator is not required even if the rotary vane pump using the self-lubricating vane is used.
A complete priming operation can be performed, the device can be downsized, and the cost can be reduced. Further, if the destruction of the self-lubricating vane can be prevented, the thickness of the vane can be reduced, and therefore, the rotary vane pump can be downsized. Further, providing the air assist portion on the suction side of the rotary vane pump has an advantage that the present invention can be carried out without processing the rotary vane pump.

In this case, the air assist portion can be structured so as to have a small hole for outside air suction provided on the suction side of the rotary vane pump.

Particularly, according to the air assist portion formed of the small hole for sucking the outside air, the air assist portion can be easily provided at low cost.

Further, the air assist portion closes the small hole for sucking the outside air provided on the suction side of the rotary vane pump and the small hole for sucking the outside air at the time of exhaust from the water supply pump, and sucks the outside air by the water when the priming is completed. It can be formed by a valve that opens an eyelet.

As described above, when a valve for closing the outside air suction small hole at the time of exhausting from the water supply pump and opening the outside air suction small hole by the water at the time of completion of priming is provided, only in the rotary vane pump. The outside air can be inhaled. Therefore, when only the air is sucked into the rotary vane pump, the valve does not open and there is no air leakage, so that the degree of vacuum in the rotary vane pump can be prevented from lowering.

Further, the priming device for the water supply pump according to the present invention is characterized in that the exhaust port of the rotary vane pump is provided with an air assist portion for sucking the outside air.

As described above, when the exhaust port of the rotary vane pump is provided with the air assist portion for sucking the outside air, the priming water enters the expansion chamber of the rotary vane pump, and when the exhaust port communicates with the expansion chamber by the rotation of the rotor, Since a certain amount of air enters the expansion chamber from the assist portion, the negative pressure in the expansion chamber decreases. Therefore, when the discharge port of the rotary vane pump communicates with the expansion chamber, the amount and speed of water flowing back from the discharge port into the expansion chamber can be suppressed. Further, since there is air in the expansion chamber, the impact force of water applied to the vane can be reduced by the damper effect of the air. Therefore, the destruction of the self-lubricating vane can be prevented.

Therefore, even in the priming device of the water supply pump having such a structure, even if the rotary vane pump using the self-lubricating vane is used, the steam separator is not necessary.

In particular, when an air assist portion is provided in the exhaust port of the rotary vane pump, air enters the rotary vane pump only when the exhaust port communicates with the expansion chamber, and therefore the degree of vacuum of the rotary vane pump is high. There is an advantage that the decrease of

In this case, the air assist portion can be structured to have a small hole for sucking outside air provided in the discharge port of the rotary vane pump.

Particularly, according to the air assist portion formed of the small holes for sucking the outside air, the air assist portion can be easily provided at low cost.

Further, the air assist portion has a small hole for sucking outside air provided in the discharge port of the rotary vane pump, and sucks outside air only by blocking discharge of water from the small hole for sucking outside air. It can be formed by a check valve for controlling the small hole.

In this way, if a check valve is provided to control the outside air suction small hole so as to prevent the discharge of water from the outside air suction small hole and only suck the outside air, the outside air suction small hole is provided at the time of priming. It is possible to prevent water from being discharged from the holes.

Further, the priming device for the water supply pump according to the present invention is characterized in that the pump casing in front of the discharge port of the rotary vane pump is provided with an air assist portion for sucking the outside air.

When the air assist portion is provided in the pump casing in front of the discharge port of the rotary vane pump in this way, a certain amount of air from the air assist portion enters the expansion chamber of the rotary vane pump, so that priming water enters the expansion chamber. When entering, the negative pressure in the expansion chamber drops. Therefore, when the discharge port of the rotary vane pump communicates with the expansion chamber, the amount and speed of water flowing back from the discharge port into the expansion chamber can be suppressed. Further, since there is air in the expansion chamber, it is possible to reduce the impact force of water applied to the vane due to the damper effect of the air, and thus it is possible to prevent the self-lubricating vane from being destroyed.

Therefore, in the priming device of the water supply pump having such a structure, the steam separator is not required even if the rotary vane pump using the self-lubricating vane is used.
A complete priming operation can be performed, the device can be downsized, and the cost can be reduced. Further, if the destruction of the self-lubricating vane can be prevented, the thickness of the vane can be reduced, and therefore, the rotary vane pump can be downsized. Further, providing the air assist portion in the pump casing in front of the discharge port of the rotary vane pump has an advantage that the present invention can be carried out by processing a single rotary vane pump.

In this case, the air assist section may be structured to have a small hole for sucking outside air provided in the pump casing in front of the discharge port of the rotary vane pump.

Particularly, according to the air assist portion formed of the small holes for sucking the outside air, the air assist portion can be formed by processing the rotary vane pump alone, and the air assist portion can be easily provided at low cost.

[0041]

FIG. 1 shows a first example of an embodiment of a priming device 14 of a water supply pump according to the present invention. In addition, in the portion corresponding to FIG. 11 described above,
The same reference numerals are given.

The priming apparatus 14 of this embodiment is characterized in that an air assist section 20 for sucking the outside air is provided on the suction side of the rotary vane pump 1 using the self-lubricating vane 5 made of carbon or the like. In this case, the air assist unit 20 is formed by a small hole 21 for intake of outside air provided in the pipe 6 on the intake side of the rotary vane pump 1.

Next, the operation of the priming device 14 will be described in detail with reference to FIGS.

When the rotary vane pump 1 is driven to perform the priming operation, only the air is sucked and discharged from the water supply pump 10 at first, but eventually the water 22 is also sucked as shown in FIG. 2 (A). become. At this time, the air 2 which is the outside air is discharged from the outside air suction small hole 21 provided in the pipe 6.
A certain amount of 3 also enters the expansion chamber 8 in the rotary vane pump 1. Therefore, the negative pressure in the expansion chamber 8 is reduced.

Therefore, as shown in FIG.
Is rotated and the discharge port 9 of the rotary vane pump 1 is rotated.
When it communicates with the expansion chamber 8, water 2 is discharged from the discharge port 9.
The amount and speed of 2 flowing back into the expansion chamber 8 can be suppressed. Further, since the expansion chamber 8 has the air 23, the impact force of water applied to the self-lubricating vane 5 can be reduced by the damper effect of the air 23. Therefore, the self-lubricating vane 5 can be prevented from being broken.

Therefore, in the priming device 14 of the water supply pump having such a structure, even if the rotary vane pump 1 using the self-lubricating vane 5 is used, the steam separator is not necessary.

Particularly, according to the air assist portion 20 including the small hole 21 for sucking outside air as in this example, the air assist portion 20 can be easily provided at low cost.

In the case of this example, since there is a small hole 21 for sucking in the outside air on the suction side of the rotary vane pump 1, the degree of vacuum is lowered in the rotary vane pump 1 due to air leakage. For this reason, the outside air suction small hole 21 has a hole diameter that minimizes the decrease in the degree of vacuum. The diameter of the small hole 21 for inhaling the outside air depends on the exhaust capacity of the rotary vane pump 1.
When the exhaust capacity is large, it is set to a large value, and when the exhaust capacity is small, it is set to a small value. The amount of air sucked into the small hole 21 for sucking outside air can be adjusted by adjusting the diameter of the small hole 21 and the length of the small hole 21.

Next, in the conventional example in which the air assist portion 20 for sucking the outside air is not provided on the suction side of the rotary vane pump 1, and in the rotary vane pump 1 in which the air assist portion 20 is provided as in this example, water is absorbed. The results of a comparative experiment of the pressure of the discharge port 9 when it flows in will be described.

FIGS. 3 (A) and 3 (B) show the pressure of the exhaust port 9 in the conventional example without the air assist portion 20 when the rotational speed of the rotary vane pump 1 is 1000 rpm, and in the present example with the air assist portion 20. The result of the comparative experiment of is shown.

FIG. 3A shows the pressure at the discharge port 9 of the rotary vane pump 1 in the conventional example without the air assist section 20, and FIG. 3B shows the discharge of the rotary vane pump 1 in this example with the air assist section 20. The pressure at port 9 is shown.

As is apparent from the figure, according to this example with the air assist portion 20, the pressure of the discharge port 9 is clearly lower than that of the conventional example without the air assist portion 20.

FIGS. 4 (A) and 4 (B) show the pressure of the discharge port 9 in the conventional example without the air assist portion 20 when the rotational speed of the rotary vane pump 1 is 2800 rpm, and in the present example with the air assist portion 20. The result of the comparative experiment of is shown.

FIG. 4A shows the pressure at the discharge port 9 of the rotary vane pump 1 in the conventional example without the air assist section 20, and FIG. 4B shows the discharge of the rotary vane pump 1 in this example with the air assist section 20. The pressure at port 9 is shown.

Also in this case, as is apparent from the figure, according to this example with the air assist portion 20, the pressure of the discharge port 9 is obviously lower than that of the conventional example without the air assist portion 20.

FIGS. 5A and 5B show a second example of the embodiment of the priming device 14 of the water supply pump according to the present invention. The parts corresponding to those in FIG. 1 described above are denoted by the same reference numerals.

In the priming device 14 of this example, the air assist portion 20 for sucking the outside air is provided on the suction side of the rotary vane pump 1 using the self-lubricating vane 5 made of carbon or the like. It is similar to the one example. The air assist unit 20 of this example includes a small hole 21 for intake of outside air provided on the intake side of the rotary vane pump 1.
And a reed valve 24 that closes the small hole for intake of outside air 21 when exhausted from the water supply pump 10 and opens the small hole for intake of outside air 21 by the flow of water 22 when priming is completed.

In such a priming device 14, as shown in FIG.
As shown in (A), the rotary vane pump 1 supplies air 2
When 2 is sucked in, the reed valve 24 closes the small hole 21 for sucking in outside air, and does not suck in air. Therefore, when the rotary vane pump 1 exhausts the water supply pump 10, the reed valve 24 does not open and air does not leak, so that the vacuum degree in the rotary vane pump 1 can be prevented from lowering.

Upon completion of priming, as shown in FIG. 5 (B), the reed valve 24 is collapsed by the flow of water 22 to open the small hole 21 for sucking the outside air, and the air 23 as the outside air enters the rotary vane pump 1. Be inhaled. Therefore, the negative pressure in the expansion chamber 8 is reduced. Therefore, when the rotor 3 rotates and the discharge port 9 of the rotary vane pump 1 communicates with the expansion chamber 8, the amount and speed of the water 22 flowing back from the discharge port 9 to the expansion chamber 8 can be suppressed. Further, since the expansion chamber 8 has the air 23, the impact force of water applied to the self-lubricating vane 5 can be reduced by the damper effect of the air 23. Therefore, the self-lubricating vane 5 can be prevented from being broken.

FIG. 6 shows a third example of the embodiment of the priming device 14 of the water supply pump according to the present invention. The parts corresponding to those in FIG. 1 described above are denoted by the same reference numerals.

The priming device 14 of this embodiment is characterized in that the exhaust port 9 of the rotary vane pump 1 using the self-lubricating vane 5 made of carbon or the like is provided with the air assist portion 20 for sucking the outside air. To do.
In this case, the air assist unit 20 includes the small hole 2 for sucking the outside air provided in the discharge port 9 of the rotary vane pump 1.
1.

As described above, the air assist portion 21 for sucking the outside air into the discharge port 9 of the rotary vane pump 1.
When the rotary vane pump 1 is provided,
When the discharge port 9 communicates with the expansion chamber 8 due to the rotation of the rotor 3 as shown in FIG. 7, a certain amount of air 23 from the outside air intake small hole 21 of the air assist portion 20
Enters the expansion chamber 8, the negative pressure in the expansion chamber 8 decreases.
Therefore, when the discharge port 9 of the rotary vane pump 1 communicates with the expansion chamber 8, water 22 is discharged from the discharge port 9 through the discharge port 9.
It is possible to suppress the amount and speed of the reverse flow of the gas into the expansion chamber 8. Also,
Since there is air in the expansion chamber 8, the impact force of water applied to the self-lubricating vane 5 can be reduced by the damper effect of the air 23. Therefore, the self-lubricating vane 5 can be prevented from being broken.

Therefore, even in the priming device 14 of the water supply pump having such a structure, even if the rotary vane pump 1 using the self-lubricating vane 5 is used, the steam separator is not necessary.

According to the air assist portion 20 including the small hole 21 for sucking outside air as in this example, the air assist portion 20 can be easily provided at low cost.

In particular, when the air assist portion 20 is provided in the exhaust port 9 of the rotary vane pump 1, the air 23 enters the rotary vane pump 1 only when the exhaust port 9 communicates with the expansion chamber 8. There is an advantage that the degree of vacuum of the rotary vane pump 1 is small.

FIG. 8 shows a fourth example of the embodiment of the priming device 14 of the water supply pump according to the present invention. The parts corresponding to those in FIG. 1 described above are denoted by the same reference numerals.

In the priming device 14 of this example, the air assist portion 20 for sucking the outside air is provided at the discharge port 9 of the rotary vane pump 1 using the self-lubricating vane 5 made of carbon or the like, as described above. This is similar to the third example. The air assist unit 20 of the present invention blocks the outside air suction small hole 21 provided in the discharge port 9 of the rotary vane pump 1 and the discharge of the water 22 from the outside air suction small hole 21 and only sucks the outside air. Thus, it is formed by the check valve 25 for controlling the small hole 21 for sucking the outside air. The check valve 25 includes a valve box 26 surrounding the small hole 21 for inhaling the outside air, and a valve hole 27 opened at an end of the valve box 26.
It is composed of a ball valve body 28 that closes the valve hole 27 in the valve box 26, and a spring 29 that urges the ball valve body 28 so as to press it against the valve hole 27.

In such a priming device 14, when the priming water 22 enters the expansion chamber 8 of the rotary vane pump 1 and the discharge port 9 communicates with the expansion chamber 8 by the rotation of the rotor 3 as shown in FIG. Due to the negative pressure in the chamber 8, the ball valve element 28 of the air assist section 20 is spring 29.
And the check valve 25 is opened away from the valve hole 27 to open the check valve 25, a certain amount of air 23 enters the expansion chamber 8 from the small hole 21 for sucking the outside air, and the negative pressure of the expansion chamber 8 decreases. . Therefore, when the discharge port 9 of the rotary vane pump 1 communicates with the expansion chamber 8, the amount and speed of the water 22 flowing back from the discharge port 9 into the expansion chamber 8 can be suppressed. Further, since there is air in the expansion chamber 8, the impact force of water applied to the self-lubricating vane 5 can be reduced by the damper effect of the air 23. Therefore, the self-lubricating vane 5 can be prevented from being broken.

Further, the check valve 25 can prevent the water 22 from being discharged from the small hole 21 for inhaling the outside air at the time of priming.

FIG. 9 shows a fifth example of the embodiment of the priming device 14 of the water supply pump according to the present invention. The parts corresponding to those in FIG. 1 described above are denoted by the same reference numerals.

In the priming device 14 of this example, an air assist portion 20 for sucking outside air is provided in the pump casing 2 in front of the discharge port 9 of the rotary vane pump 1 using the self-lubricating vane 5 made of carbon or the like. It is characterized by In this case, the air assist unit 20
Is formed by a small hole 21 for sucking outside air provided in the pump casing 2 in front of the discharge port 9 of the rotary vane pump 1.

Next, the operation of the priming device 14 will be described in detail.

When the rotary vane pump 1 is driven and the priming operation is performed, only the air is sucked and discharged from the water supply pump 10 at first, but eventually the water 22 is also sucked. At this time, a certain amount of air 23, which is the outside air, enters the expansion chamber 8 in the rotary vane pump 1 together with the outside air suction small hole 21 provided in the pump casing 2 in front of the discharge port 9. Therefore, the negative pressure in the expansion chamber 8 is reduced.

Therefore, when the rotor 3 rotates and the discharge port 9 of the rotary vane pump 1 communicates with the expansion chamber 8, the amount and speed of the water 22 flowing back from the discharge port 9 into the expansion chamber 8 can be suppressed. . In addition, the air 2 in the expansion chamber 8
3, the impact force of water applied to the self-lubricating vane 5 can be reduced by the damper effect of the air 23. Therefore, the self-lubricating vane 5 can be prevented from being broken.

Therefore, in the priming device 14 of the water supply pump having such a structure, even if the rotary vane pump 1 using the self-lubricating vane 5 is used, the steam separator is not required, and the size of the device can be reduced. Therefore, the cost can be reduced. Further, if the destruction of the self-lubricating vane 5 can be prevented, the thickness of the vane 5 can be reduced, and thus the rotary vane pump 1 can be downsized. Further, when the air assist portion 20 is provided in the pump casing 2 in front of the discharge port 9 of the rotary vane pump 1, there is an advantage that the present invention can be carried out by processing a single rotary vane pump.

Particularly, according to the air assist portion 20 including the small hole 21 for sucking the outside air as in this example, the air assist portion 20 can be formed by processing the rotary vane pump alone, and the air assist portion 20 can be easily and inexpensively manufactured. Can be provided.

The self-lubricating vane 5 is not limited to carbon, but may be resin such as polyimide.

[0078]

In the priming device for the water feed pump according to the present invention, the air assist portion for sucking the outside air is provided at any portion from the suction side of the rotary vane pump to the discharge port of the rotary vane pump.
Since a certain amount of air from the air assist section enters the expansion chamber of the rotary vane pump, when priming water enters the expansion chamber, the negative pressure of the expansion chamber decreases, so that the discharge port of the rotary vane pump expands. The amount and speed of water flowing back from the discharge port into the expansion chamber can be suppressed when communicating with the. Further, since there is air in the expansion chamber, it is possible to reduce the impact force of water applied to the vane due to the damper effect of the air, and thus it is possible to prevent the self-lubricating vane from being destroyed.

Therefore, in the priming device for the water supply pump having such a structure, the steam separator is not required even if the rotary vane pump using the self-lubricating vane is used.
A complete priming operation can be performed, the device can be downsized, and the cost can be reduced. Further, if the destruction of the self-lubricating vane can be prevented, the thickness of the vane can be reduced, and therefore, the rotary vane pump can be downsized.

Further, in the priming device for the water supply pump according to the present invention, since the air assist portion for sucking the outside air is provided on the suction side of the rotary vane pump, when the priming water enters the expansion chamber of the rotary vane pump, Since a certain amount of air from the air assist portion enters the expansion chamber, the negative pressure in the expansion chamber decreases, and when the discharge port of the rotary vane pump communicates with the expansion chamber, water is discharged from the discharge port into the expansion chamber. It is possible to suppress the amount and speed of backflow to the. Further, according to this priming device, since there is air in the expansion chamber, it is possible to reduce the impact force of water applied to the vane due to the damper effect of the air, and thus it is possible to prevent the self-lubricating vane from being destroyed.

Therefore, in the priming device for the water supply pump having such a structure, the steam separator is not required even if the rotary vane pump using the self-lubricating vane is used.
A complete priming operation can be performed, the device can be downsized, and the cost can be reduced. Further, if the destruction of the self-lubricating vane can be prevented, the thickness of the vane can be reduced, and therefore, the rotary vane pump can be downsized.

In this case, if the air assist portion is formed by the small hole for outside air suction provided on the suction side of the rotary vane pump, the air assist portion can be easily provided at low cost.

Further, the air assist section closes the small hole for sucking the outside air provided on the suction side of the rotary vane pump and the small hole for sucking the outside air at the time of exhaust from the water supply pump, and sucks the outside air by the water when the priming is completed. If it is formed by a valve that opens a small hole, the presence of the valve allows outside air to be sucked into the rotary vane pump only when necessary. Therefore, when only the air is sucked into the rotary vane pump, the valve does not open and there is no air leakage, so that the degree of vacuum in the rotary vane pump can be prevented from lowering.

Further, in the priming apparatus for the water supply pump according to the present invention, since the air assist portion for sucking the outside air is provided at the discharge port of the rotary vane pump, the priming water enters the expansion chamber of the rotary vane pump and the rotor When the discharge port communicates with the expansion chamber due to rotation, a certain amount of air enters the expansion chamber, so that the negative pressure in the expansion chamber decreases, which causes the discharge port of the rotary vane pump to communicate with the expansion chamber. When doing so, the amount and speed of water flowing back from the discharge port into the expansion chamber can be suppressed. Further, according to this priming device, since there is air in the expansion chamber, it is possible to reduce the impact force of water applied to the vane due to the damper effect of the air, and thus it is possible to prevent the self-lubricating vane from being destroyed.

Therefore, even in the priming device of the water supply pump having such a structure, even if the rotary vane pump using the self-lubricating vane is used, the steam separator is not required,
A complete priming operation can be performed, the device can be downsized, and the cost can be reduced.

In particular, if the exhaust port of the rotary vane pump is provided with an air assist portion, air enters the rotary vane pump only when the exhaust port communicates with the expansion chamber, and therefore, the rotary vane pump. There is an advantage that the degree of vacuum is less reduced.

In this case, if the air assist portion is formed by a small hole for sucking outside air provided in the discharge port of the rotary vane pump, the air assist portion can be easily provided at low cost.

Further, the air assist portion has a small hole for sucking outside air provided in the discharge port of the rotary vane pump, and the outside air sucking hole prevents the discharge of water and only sucks the outside air. If the check valve is formed by a check valve that controls the suction small hole, the presence of the check valve can prevent water from being discharged from the outside air suction small hole at the time of priming.

Further, in the priming device for the water feed pump according to the present invention, the pump casing in front of the discharge port of the rotary vane pump is provided with the air assist portion for sucking the outside air. Enter the expansion chamber of the rotary vane pump, the negative pressure of the expansion chamber decreases when priming water enters the expansion chamber, and when the discharge port of the rotary vane pump communicates with the expansion chamber, the discharge port Therefore, it is possible to suppress the amount and speed of water flowing back into the expansion chamber. Further, since there is air in the expansion chamber, it is possible to reduce the impact force of water applied to the vane due to the damper effect of the air, and thus it is possible to prevent the self-lubricating vane from being destroyed.

Therefore, in the priming device for the water supply pump having such a structure, the steam separator is not required even if the rotary vane pump using the self-lubricating vane is used.
A complete priming operation can be performed, the device can be downsized, and the cost can be reduced. Further, if the destruction of the self-lubricating vane can be prevented, the thickness of the vane can be reduced, and therefore, the rotary vane pump can be downsized. Further, providing the air assist portion in the pump casing in front of the discharge port of the rotary vane pump has an advantage that the present invention can be carried out by processing a single rotary vane pump.

Particularly, according to the air assist portion formed of the small holes for sucking the outside air, the air assist portion can be formed by processing the rotary vane pump alone, and the air assist portion can be easily provided at low cost.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first example of an embodiment of a priming device for a water supply pump according to the present invention.

2A and 2B are operation explanatory views of the priming device shown in FIG.

3 (A) and 3 (B) show the results of a comparative experiment of the pressure of the discharge port in the case of the conventional example without the air assist part and the case of this example with the air assist part when the rotation speed of the rotary vane pump is 1000 rpm. FIG.

FIGS. 4 (A) and 4 (B) show the results of a comparative experiment of the pressure of the discharge port in the case of the conventional example without the air assist portion and the case of the present example with the air assist portion when the rotation speed of the rotary vane pump is 2800 rpm. FIG.

5 (A) and 5 (B) are vertical cross-sectional views showing the operation in the second example of the embodiment of the priming device for the water feed pump according to the present invention.

FIG. 6 is a vertical cross-sectional view showing a third example of an embodiment of the priming device for a water supply pump according to the present invention.

FIG. 7 is a vertical sectional view showing the operation of the priming device shown in FIG.

FIG. 8 is a vertical cross-sectional view showing a fourth example of an embodiment of the priming device for a water supply pump according to the present invention.

FIG. 9 is a vertical cross-sectional view showing a fifth example of an embodiment of the priming device for a water supply pump according to the present invention.

10 (A) and (B) are operation explanatory views of a rotary vane pump in a conventional priming device.

FIG. 11 is a vertical sectional side view of a main part of a priming device of a conventional water supply pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary vane pump 2 pump case 3 rotor 4 groove 5 vane 6 piping 7 discharge pipe 8 expansion chamber 9 discharge port 10 water supply pump 11 water intake 12 discharge valve 13 discharge port 14 priming device 15 discharge passage 16 strainer 17 steam separator 18 reverse Stop valve 19 Diaphragm type water stop valve 20 Air assist part 21 Small hole for outside air suction 22 Water 23 Air 24 Reed valve 25 Check valve 26 Valve box 27 Valve hole 28 Ball valve body 29 Spring 30 Float valve

Claims (9)

[Claims] 1. A priming device for a water supply pump, which drives a rotary vane pump using a self-lubricating vane to discharge the air in the water supply pump to the outside to prime the water supply pump. A suction side of the rotary vane pump. An priming device for a water feed pump, characterized in that an air assist portion for sucking outside air is provided at any part from the exhaust port to the exhaust port of the rotary vane pump. 2. A priming device of a water supply pump, which drives a rotary vane pump using a self-lubricating vane to discharge air in the water supply pump to the outside to prime the water supply pump, wherein a suction side of the rotary vane pump. 1. A priming device for a water supply pump, characterized in that an air assist unit for sucking outside air is provided in the. 3. The priming device for a water supply pump according to claim 2, wherein the air assist portion has a structure including a small hole for outside air suction provided on the suction side of the rotary vane pump. . 4. The air assist section closes the small hole for outside air suction provided on the suction side of the rotary vane pump and the small hole for outside air suction at the time of exhaust from the water supply pump, so that the water after completion of priming 3. A valve that opens the small hole for sucking outside air.
The water pump priming device described in. 5. A priming device for a water supply pump, which drives a rotary vane pump using a self-lubricating vane to discharge air in the water supply pump to the outside to prime the water supply pump, wherein a discharge port of the rotary vane pump. 1. A priming device for a water supply pump, characterized in that an air assist unit for sucking outside air is provided in the. 6. The structure according to claim 5, wherein the air assist portion has a small hole for sucking outside air provided in a discharge port of the rotary vane pump.
The water pump priming device described in. 7. The air assist portion is provided with a small hole for outside air suction provided in a discharge port of the rotary vane pump, and prevents the discharge of water from the small hole for outside air suction to suck only outside air. The priming device for a water supply pump according to claim 5, wherein the priming device is formed by a check valve that controls the small hole for sucking outside air. 8. A priming device for a water supply pump, which drives a rotary vane pump using a self-lubricating vane to discharge the air in the water supply pump to the outside to prime the water supply pump, the discharge port of the rotary vane pump. A priming device for a water supply pump, characterized in that an air assist portion for sucking outside air is provided in a pump casing before the pump casing. 9. The priming device for a water supply pump according to claim 2, wherein the air assist portion has a structure provided with a small hole for sucking outside air provided in the pump casing.