JP2000038996A - Pump for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply fill up lubricant to the driving parts of a pump. SOLUTION: This pump for liquid is equipped with a first lubricant pot 1 for storing lubricant. And a second lubricant pot 6 is connected with the first lubricant pot 1 by way of a lubricant feeding pipe 7. The lubricant feeding pipe 7 is provided with a dipping part 71 that is a wedge shaped pipe, at its tip end, and the dipping part 71 is inserted under the upper surface of lubricant in the inside of the first lubricant part 1. When the surface of lubricant comes down to a place lower than the upper part of the dipping part 71, gas (inactive gas) in the inside of the first lubricant pot 1 breaks into the dipping part 71, and concurrently, lubricant in the second lubricant part 6 flows out to the first lubricant pot 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid pump for transporting a liquid, and more particularly to a liquid pump for handling a turbid liquid such as a slurry.

[0002]

2. Description of the Related Art Conventionally, a canned motor pump has been known as a centrifugal pump for transporting a liquid. This canned motor pump has a configuration in which an impeller (impeller) for transporting liquid supply and a driving unit (configuration for rotating the impeller) are both built in a casing. In such a normal canned motor pump, a liquid feed is used as a lubricating liquid for lubricating the driving unit. In addition, the liquid sending means a liquid which is sucked / discharged by a pump and transported. In addition, the casing is a body that forms a passage of the liquid supply in the pump.

In the above-described canned motor pump, when solids such as fine particles are mixed in the liquid feed, the solids are interposed between a motor shaft and a bearing (bearing or the like) in a driving unit. It got into the gap between the motors, causing a failure. For this reason, the canned motor pump as described above cannot handle a highly turbid liquid such as a slurry. Note that a slurry is a turbid liquid in which fine solid particles are dispersed in a liquid.

Therefore, a vertical canned motor pump has been developed and put to practical use for transporting a turbid liquid such as a slurry. This vertical canned motor pump has a configuration in which an impeller is arranged in a casing, while a driving unit is arranged outside the casing. In this vertical canned motor pump, a lubricating liquid different from liquid feeding is used to lubricate the driving unit. As described above, in the configuration of the vertical canned motor pump, since the liquid supply does not directly contact the driving unit, even when the slurry is supplied, the failure of the driving unit due to the solid matter during the liquid supply. It is not triggered.

There are two types of vertical canned motor pumps, one of a type in which the lubricating liquid is disposable, and the other in which the lubricating liquid is reused by circulating the lubricating liquid.

In a vertical canned motor pump of a type in which the lubricating liquid is disposable, a predetermined amount of lubricating liquid is supplied to a drive unit from a lubricating liquid pot provided in the pump. Then, the operator appropriately replenishes the lubricating liquid pot with the lubricating liquid.

In a vertical canned motor pump of the type that reuses the lubricating fluid, the lubricating fluid that lubricates the motor shaft of the driving unit is driven by the power of an auxiliary impeller or the like formed in the circulation system. Collected in a lubricant pot for storage. The lubricating liquid is supplied from the lubricating liquid pot to the drive unit again.

In this type of vertical canned motor pump, the lubricating fluid in the circulation system gradually decreases as the pump is used. The reason will be described below. That is, in the vertical canned motor pump, the impeller is rotated by rotating the motor shaft of the drive unit connected to the impeller in the casing. Therefore, a through hole for passing the motor shaft is formed in the casing. In addition, a mechanical seal is usually formed in the through-hole so that the liquid does not enter the casing.

[0009] However, if the seal at the through-hole is made very tight, the resistance in rotation of the motor shaft increases and the discharge rate of the pump decreases. Therefore, the seal is somewhat loose.

Further, when liquid is mixed into the driving section in the circulating system, the solid particles being supplied cause a failure of the driving section as described above. For this reason, in this vertical canned motor pump, the pressure of the circulating system is set to be equal to or higher than the pressure of the liquid sending in the casing. Therefore, the lubricating fluid in the circulation system gradually leaks from the through hole in the casing.

As described above, in the vertical canned motor pump, it is necessary to periodically replenish the lubricating liquid regardless of whether the lubricating liquid is reused or not. For this reason,
In the vertical canned motor pump, the lubricating liquid pot stores as much lubricating liquid as possible, and a transparent window (liquid level) for monitoring the liquid level in the pot is provided on the side of the lubricating liquid pot. Gauge). Then, the worker uses the liquid level gauge to periodically monitor the amount of the lubricating liquid in the lubricating liquid pot,
By appropriately replenishing the lubricating liquid, a situation in which the lubricating liquid is insufficient and the drive unit breaks down can be avoided.

[0012]

However, a vertical canned motor pump of the type that does not reuse the lubricating liquid is
Due to the large amount of the lubricating liquid used, it was necessary to replenish the lubricating liquid pot very frequently. For this reason, there was a problem that the operating cost increased.

In a vertical canned motor pump of the type that reuses the lubricating liquid, the lubricating liquid pot is a part of the circulation system of the pump. was there. That is, a small amount of liquid is mixed into the circulation system from the through-hole of the casing, and the mechanical seal at this through-hole is usually made of carbon, and is slightly removed due to friction with the motor shaft. It will be sharpened one by one. Therefore, the material of the seal is also mixed into the circulation system. Then, the solid particles and the sealing material in the liquid fed into the circulation system enter the lubricating liquid pot via the lubricating liquid, and cause contamination of the liquid level gauge. For this reason, in a vertical canned motor pump that has been used for a long period of time, an accurate liquid amount in the lubricating liquid pot could not be grasped due to contamination of the liquid level gauge.

In the conventional vertical canned motor pump, the lubricating liquid pot is used to reliably supply the lubricating liquid regardless of whether the lubricating liquid is reused or not. It is provided on the main body. For this reason,
For example, if the pump is installed in a place where it is difficult for workers to enter, such as a place where many pipes and large equipment are installed, there is a problem that it is difficult to monitor the liquid level gauge and to replenish the lubricant. Was.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a liquid capable of easily and reliably replenishing a lubricating liquid for a driving portion of a pump. To provide a pump for use.

[0016]

According to a first aspect of the present invention, there is provided a liquid pump for lubricating a driving unit for rotating an impeller. In a liquid pump using a liquid, a first storage unit for storing a lubricating liquid and supplying a required amount of the lubricating liquid to a driving unit; and a lubricating liquid amount in the first storage unit being equal to or less than a predetermined amount. In this case, the first storage unit is provided with a lubricating fluid replenishing unit for replenishing the lubricating fluid.

In the above configuration, the liquid pump is
It is a pump for transporting liquid. The driving unit is, for example, an induction motor, a motor shaft, or the like, for converting energy supplied from the outside into energy to be given to the liquid. The liquid sending means liquid transported by the liquid pump, that is, liquid sucked and discharged by the liquid pump. The lubricating liquid is used to reduce the friction and heat generation of the driving unit. The lubricating liquid is stored in a first storage unit provided in the liquid pump, and the first storage unit supplies an amount of the lubricating liquid required by the driving unit. .

In the above configuration, the amount of the lubricating fluid in the first storage unit is detected, and when the amount becomes equal to or less than a predetermined amount, the first storage unit is replenished with the lubricating fluid. A lubricating liquid replenishing unit is provided. Therefore,
In the above configuration, the first storage unit always stores a predetermined amount or more of the lubricating liquid. Thus, according to the above configuration, even if the operator does not monitor the amount of the lubricating fluid in the first storage unit or replenish the lubricating fluid, the lubricating fluid for the driving unit does not run short. Therefore, it is possible to reduce the burden on the operator during driving.

According to a second aspect of the present invention, in the liquid pump according to the first aspect, the lubricating liquid replenishing unit includes a second storing unit for storing a lubricating liquid, 2
A lubricating liquid supply unit for supplying a lubricating liquid from the storage unit to the first storage unit, and measuring the amount of the lubricating liquid in the first storage unit, and controlling the lubricating liquid supply unit based on the measurement result. And a liquid amount measuring unit for supplying the lubricating liquid from the second storage unit to the first storage unit.

According to the above arrangement, the lubricating fluid replenishing section includes:
A second storage unit, a liquid amount measurement unit, and a lubricating liquid supply unit are provided. The second reservoir is a reservoir for the lubricating liquid that is different from the first reservoir. The second storage unit may be any storage unit that can store the lubricating liquid, and is installed at a position that is easy for the operator to manage. In addition, the lubricating liquid supply unit is provided from the second storage unit.
For supplying the lubricating liquid to the first storage unit, for example, it may be composed of a pipe for flowing the lubricating liquid and a small pump for the lubricating liquid, and conveys the lubricating liquid by a predetermined amount. For a gondola.

[0021] In the above configuration, the liquid amount measuring section includes:
The amount of lubricating fluid in the first storage is measured. The liquid amount measuring unit controls the lubricating liquid supply unit based on the measurement result, and supplies the lubricating liquid from the second storage unit to the first storage unit. The liquid amount measuring unit can measure the liquid amount of the first storage unit and can perform control for supplying the lubricating liquid to the first storage unit based on the measurement result. For example, a liquid level sensor or the like installed in the first storage unit may be used.

According to the above configuration, the lubricating liquid replenishing section can be simply configured, so that the liquid pump according to the first aspect can be easily realized. Further, when the liquid pump according to the first aspect is configured to circulate and reuse the lubricating liquid, the second storage unit does not enter the circulation system, so that the lubrication in the second storage unit is not performed. The liquid does not get dirty.

Further, in the above configuration, the worker replenishes the second storage section with the lubricating liquid, but the worker does not refill the second storage section.
Can be arranged at a desired position, so that the replenishment of the lubricating fluid is facilitated.

Further, the liquid pump according to claim 3 is
3. The liquid pump according to claim 2, wherein the second storage unit is provided above the first storage unit, and the lubricating liquid supply unit is inserted into the first storage unit. A pipe having a first end and a second end inserted into the lubricating fluid in the second reservoir, wherein the fluid quantity measuring unit comprises a first end in the lubricating fluid supply unit. A wedge-shaped pipe provided at the tip of the section and inserted into the lubricating fluid in the first storage section.

[0025] According to the above configuration, the second storage section is disposed above the first storage section. The lubricating liquid supply unit includes a pipe having both ends inserted into the lubricating liquid in the first and second storage units, and the liquid amount measuring unit includes a wedge-shaped pipe provided at a tip of the lubricating liquid supply unit. It is configured. The wedge-shaped pipe is formed by cutting a cylindrical pipe obliquely with respect to a radial direction and a longitudinal direction. In the above configuration, the wedge-shaped pipe is inserted into the liquid level in the first storage unit, that is, below the liquid level of the lubricating liquid.

Therefore, in the above configuration, when the amount of the lubricating liquid in the first storage section decreases, the upper part of the cut surface of the wedge-shaped pipe comes to be located above the liquid level. Then, from this cut surface, the gas in the first storage unit is
It penetrates the wedge-shaped pipe and the pipe serving as the lubricating liquid supply section, and reaches the second storage section. Then, in accordance with the movement of the gas, the lubricating liquid in the second storage section is supplied to the first storage section via the two pipes. Then, the supply of the lubricating liquid is continued until the upper portion of the cut surface of the wedge-shaped pipe becomes equal to or lower than the liquid level of the lubricating liquid in the first storage section.

As described above, according to the above configuration, the lubricating liquid supply unit and the liquid amount measurement unit according to the second aspect can be realized with a very simple configuration. Therefore,
According to the above configuration, the liquid pump according to claim 2 can be realized very easily and at low cost.

Further, the liquid pump according to claim 4 is
In addition to the liquid pump according to any one of claims 1 to 3, the lubricating fluid supplied to the drive unit from the first storage unit and lubricating the drive unit is stored in the first storage unit again. And a lubricating fluid circulating section for the purpose.

In the above configuration, the liquid pump is provided with the lubricating liquid circulating section for circulating and reusing the lubricating liquid. That is, the lubricating liquid circulating unit is for transporting the lubricating liquid supplied from the first storage unit to the first storage unit again after passing through a processing device such as a heat exchanger. Therefore, in the above configuration, by reusing the lubricating liquid, it is not necessary to constantly inject the lubricating liquid during the operation, so that the operation cost can be reduced.

Further, in the above configuration, the lubricating fluid replenishing section,
Alternatively, the members in the lubricating liquid replenishing section do not form a circulation path for the lubricating liquid. For this reason, the used lubricating liquid does not enter the lubricating liquid replenishing unit, so that the lubricating liquid replenishing unit is not contaminated by the used lubricating liquid.

Further, the liquid pump according to claim 5 is
The liquid pump according to any one of claims 2 to 4, wherein the second storage unit includes a liquid amount display unit for displaying a lubricating liquid amount in the second storage unit. And

According to the above configuration, the second storage unit includes:
A liquid amount display unit for displaying the liquid amount in the second storage unit is provided so that an operator can easily grasp the lubricating liquid amount. The liquid amount display unit may be, for example, a transparent portion formed on a side wall of the second storage unit or a liquid level sensor having a digital display function. Thus, the operator can accurately and easily grasp the liquid amount in the second storage unit.

Further, as described above, the second storage section can be installed at a position desired by the operator.
Therefore, according to the above configuration, even when a configuration other than the second storage unit is installed in a hard-to-access place, the worker can easily grasp the amount of the lubricating liquid. . Further, as described in claim 4, the liquid pump is:
When the lubricating liquid is of a type that is reused, the liquid amount display unit provided in the first storage unit may be contaminated by the used lubricating liquid, and the liquid amount may not be clearly displayed. However, since the used lubricating liquid is not mixed into the second storage section, the liquid amount display section in the second storage section is not contaminated. Therefore, in the above configuration, it is possible to reliably display the amount of the lubricating liquid.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. FIG. 2 is an explanatory diagram schematically showing a configuration of a vertical canned motor pump (hereinafter, referred to as the present pump) which is a liquid pump according to the present embodiment. As shown in this drawing, the present pump includes a first lubricating liquid pot 1, a driving unit 2, a casing unit 4, a heat exchanger 5, a second lubricating liquid pot 6, and a lubricating liquid supply pipe 7.

First, the liquid transfer handled in the present pump will be described. This pump is capable of sucking and discharging various liquids that can be pumped, and is particularly suitable for transporting highly turbid liquids such as slurries. A slurry is a turbid liquid in which fine solid particles are dispersed in a liquid. The pump is capable of sucking and discharging such a liquid feed at a rate of about 130 liters per minute. The total head of this pump is about 47 m.

Next, the structure of the present pump will be described.
The first lubricating liquid pot 1 shown in FIG. 2 is a tank for storing a lubricating liquid for lubricating the driving unit. As the lubricating liquid, it is possible to use a clear liquid that can be mixed in the liquid to be sent. For example, a mother liquor in the liquid sending such as an organic solvent such as water, toluene, xylene, ethylene glycol, and chlorobenzene can be used. Etc. can be used.

The driving unit 2 includes a motor including a stator and a rotor, a rotor shaft, and the like. The driving unit 2 rotates the rotor shaft and an impeller in a casing unit 4 described later by electric power supplied from the outside to suck and discharge liquid supply. It is.

The casing section 4 includes an impeller described later, and constitutes a flow path of a liquid supply in the present pump. Further, the drive unit 2 is provided in the casing unit 4.
Is provided with a through hole described later provided with a mechanical seal. And with this through hole,
The rotor shaft of the drive section 2 is inserted into the casing section 4. In addition, a more detailed configuration of the driving unit 2, the casing unit 4, and the heat exchanger 5 will be described later.

The heat exchanger 5 is connected to the first lubricating liquid pot 1 and the drive unit 2 to lower the temperature of the used lubricating liquid discharged from the drive unit 2 and to reduce the lubricating liquid to the first lubricating liquid. It is to be stored again in the liquid pot 1. As described above, the circulation system of the lubricating liquid in the present pump is constituted by the first lubricating liquid pot 1, the driving unit 2, and the heat exchanger 5.

The second lubricating liquid pot 6, like the first lubricating liquid pot 1, is a tank for storing the lubricating liquid, and is used to make up for the lack of the lubricating liquid in the first lubricating liquid pot 1. . Further, the second lubricating liquid pot 6 is arranged at a position above the first lubricating liquid pot 1 so as to be easily managed by an operator.

Further, as shown in FIG. 2, a lubricating liquid supply pipe 7 is connected to the first lubricating liquid pot 1 and the second lubricating liquid pot 6. The lubricating liquid supply pipe 7 is a pipe for carrying the lubricating liquid from the second lubricating liquid pot 6 to the first lubricating liquid pot 1. More detailed configurations of the first lubricating liquid pot 1, the second lubricating liquid pot 6, and the lubricating liquid supply pipe 7 will be described later.

Next, a more detailed configuration of the drive unit 2, the casing unit 4, and the heat exchanger 5 will be described.
FIG. 3 is an explanatory diagram showing the configurations of the drive unit 2, the casing unit 4, and the heat exchanger 5. As shown in this figure,
The drive unit 2 is provided with a motor including a stator 11 and a rotor 12, rotor shafts 13 and 14, an auxiliary impeller 15, and bearing units 16 and 17.

The stator 11 and the rotor 12 constitute a three-phase cage induction motor. And the stator 11
Are provided with electrodes (not shown), and the motor is driven by driving power supplied from the electrodes. The rotor 12 has rotor shafts 13 at both ends.
, And these rotor shafts 13 and 14 are rotated by rotating with the above-described drive power.

The rotor shaft 13 is a rotor shaft formed at the upper end of the rotor 12 and has an auxiliary impeller 15
Is provided. This auxiliary impeller 15 is
, That is, an impeller formed at a boundary portion with the first lubricating liquid pot 1. And the auxiliary impeller 1
5 rotates the lubricating liquid in the first lubricating liquid pot 1 between the drive unit 2, the heat exchanger 5, and the first lubricating liquid pot 1 by rotating together with the rotor shaft 13. The bearing 16 is a bearing that supports the rotation of the rotor shaft 13. As a material of the bearing portion 16, for example, carbon graphite can be used.

The rotor shaft 14 is a rotor shaft formed at the lower end of the rotor 12 and penetrates a through-hole 23 described later formed in the casing portion 4 to be connected to an impeller 24 described later in the casing portion 4. It is connected. The bearing portion 17 is a bearing that supports the rotation of the rotor shaft 14, and as a material, for example, carbon graphite can be used.

Further, as shown in FIG.
Has pipes 35 and 36, and is connected to the first lubricating liquid pot 1 and the drive unit 2 by the pipes 35 and 36. Then, the heat exchanger 5 indirectly cools the lubricating liquid injected from the pipe 36 with cooling water (not shown),
The liquid is discharged to the first lubricating liquid pot 1 via the pipe 35.

Further, as shown in this figure, a suction part 21, a discharge part 22, a through-hole 23 and a see-through window 25 are formed in the casing part 4, and the impeller 24 is provided inside. . The suction part 21 is a nozzle part formed below the casing part 4 for taking in the liquid supply. Further, the discharge unit 22 is a nozzle portion formed above the casing unit 4 for discharging the liquid supply.

The through-hole 23 is a through-hole formed at the boundary between the casing 4 and the drive section 2 and through which the rotor shaft 14 of the drive section 2 passes as described above. Further, a mechanical seal 31 is provided in the through hole 23. This mechanical seal 31
For example, it is made of carbide carbon or ceramic. Then, the mechanical seal 31 includes the rotor shaft 14 and the through hole 2.
By increasing the degree of close contact with the casing 3, liquid supply or leakage of the lubricating fluid between the drive section 2 and the casing section 4 is blocked.

The see-through window 25 is a transparent window formed on the side surface of the casing unit 4 and displays the state of liquid supply in the casing unit 4. The impeller 24 is an impeller joined to the rotor shaft 14. Then, the impeller 24 rotates together with the rotor shaft 14 so that
The liquid is sucked from the suction part 21 and discharged from the discharge part 22.

Next, the first lubricating liquid pot 1 shown in FIG.
The configuration of the second lubricating liquid pot 6 and the lubricating liquid supply pipe 7 will be described. FIG. 1 shows these first lubricating liquid pots 1 and 2
FIG. 3 is an explanatory diagram showing a configuration of a lubricating liquid pot 6 and a lubricating liquid supply pipe 7. As shown in this figure, the first lubricating liquid pot 1 is provided with a gas pressurizing port 41, a gas pressure reducing valve 42, a lubricating liquid replenishing port 43, a lubricating liquid inlet 44, and a lubricating liquid supply port 45. Further, a level gauge 46 is provided.

The first lubricating liquid pot 1 is filled with a lubricating liquid and an inert gas such as nitrogen gas. Then, a gas pressurizing port 41 and a gas pressure reducing valve 42 shown in FIG.
Are valves and valves for adjusting the inert gas pressure in the first lubricating liquid pot 1 to a predetermined value. The pressure of the inert gas is adjusted to a value such that the pressure in the passage of the lubricating liquid is higher than the pressure in the casing 4.

The lubricating liquid replenishing port 43 is a through hole for replenishing the pot with lubricating liquid, and the lubricating liquid supply pipe 7 is inserted therein. The lubricating liquid inlet 44 is a through hole for collecting the used lubricating liquid cooled by the heat exchanger 5, and has a pipe 35 inserted therein. Also, the lubrication liquid supply port 4
Reference numeral 5 denotes a through hole for supplying a lubricating liquid from the first lubricating liquid pot 1 to the driving unit 2.

The level gauge 46 is provided for the first lubricating liquid pot 1.
It is a window for displaying the amount of the lubricating liquid in the inside. That is,
An operator can check the amount of the lubricating liquid in the first lubricating liquid pot 1 using the level gauge 46.

As shown in FIG. 1, the level gauge 46
Pipes 51 and 52 attached to the side surface of the first lubricating liquid pot 1 so that the inert gas and the lubricating liquid in the first lubricating liquid pot 1 do not leak, and both ends of the pipes 51 and 52 are joined. And a transparent tube 53. Transparent tube 5
Reference numeral 3 denotes a pipe made of a transparent material such as acrylic, glass tube, or plastic, the scale of which is carved on the surface. Then, the lubricating liquid flows through the transparent pipe 5 through the pipes 51 and 52.
3, the liquid level in the transparent tube 53 becomes
The liquid level in the first lubricating liquid pot 1 is the same as the liquid level. Therefore, the worker can detect the liquid level in the first lubricating liquid pot 1 by measuring the liquid level in the transparent tube 53.

As shown in FIG. 1, the second lubricating liquid pot 6 is provided with a lid 8 provided with a handle 81 at an upper portion, and displays the liquid level in the second lubricating liquid pot 6. Level gauge 46a is provided on the side surface. In the lower part of the second lubricating liquid pot 6, a lubricating liquid supply port 6 serving as a through hole for inserting a lubricating liquid supply pipe 7 is provided.
1 is provided. The above-mentioned lid 8 is a metal lid in the second lubricating liquid pot 6. That is, in the second lubricating liquid pot 6, the replenishment of the lubricating liquid is performed with the lid 8 opened. Also, the handle 81 on the lid 8
Is for facilitating opening and closing of the lid 8.

The height of the second lubricating liquid pot 6 is approximately twice the height of the first lubricating liquid pot, and the volume thereof is also approximately double. For this reason, the level gauge 46a is larger than the level gauge 46 provided in the first lubricating liquid pot 1. The level gauge 46a includes pipes 51 and 52 similar to those provided in the first lubricating liquid pot 1, and a transparent pipe 53 longer than the transparent pipe 53 in the level gauge 46.
a. Like the transparent tube 53, the transparent tube 53a is a pipe made of a transparent material such as an acrylic, glass tube, or plastic and has a scale engraved on the surface. Then, the lubricating liquid flows through the transparent pipe 5 through the pipes 51 and 52.
The liquid level in the transparent tube 53a is set to the same height as the liquid level in the second lubricating liquid pot 6 by entering into the 3a. Therefore, the worker can detect the liquid level in the second lubricating liquid pot 6 by measuring the liquid level in the transparent tube 53a.

Further, as shown in FIG.
The upper end has a lubricating liquid supply port 6 of the second lubricating liquid pot 6.
1, the lower end is inserted into the first lubricating liquid pot 1 at the lubricating liquid replenishing port 43 of the first lubricating liquid pot 1 while being inserted into the second lubricating liquid pot 6. I have.

The lubricating liquid supply pipe 7 is fixed by an O-ring (not shown) in the lubricating liquid supply port 61 of the second lubricating liquid pot 6 and the lubricating liquid replenishing port 43 of the first lubricating liquid pot 1. The inert gas in the lubricating liquid pot 1 does not leak to the outside. Further, the inside of the lubricant supply pipe 7 is always filled with the lubricant.

At the end of the lubricating liquid supply pipe 7 inside the first lubricating liquid pot 1, a dip portion (liquid amount measuring portion, wedge-shaped pipe) 71, which is a wedge-shaped pipe, is formed. FIG. 4 is an explanatory diagram showing a configuration of the dip portion 71 in the lubricating liquid supply pipe 7. As shown in the figure, the dip portion 71 is formed by cutting a hollow cylinder obliquely in the radial direction and the length direction, and has a cross section 71a.

Next, the operation of the present pump will be described.
When the operation of this pump is started, the rotor 1 shown in FIG.
2 rotates, and with this rotation, the rotor shaft 13 and the rotor shaft 14 and the auxiliary impeller 15 and the impeller 24 joined to the rotor shafts 13 and 14 rotate.

Then, by the rotation of the impeller 24, the liquid is sucked from the suction part 21 and discharged from the discharge part 22. At this time, the presence / absence of liquid supply in the casing portion 4 and the state of liquid supply are confirmed by the see-through window 25 shown in FIG. Further, the rotation of the auxiliary impeller 15 causes the first
The lubricating liquid in the lubricating liquid pot 1 circulates in a circulation system constituted by the drive unit 2, the heat exchanger 5, and the first lubricating liquid pot 1.

Here, the circulation of the lubricating liquid will be described. The lubricating liquid circulates through the circulation system in the pump by the energy given from the auxiliary impeller 15 in the drive unit 2. That is, when the auxiliary impeller 15 is rotated, the lubricating liquid stored in the first lubricating liquid pot 1 is supplied to the drive unit 2 from the lubricating liquid supply port 45. The lubricating fluid is applied to the rotor shaft 13 and the bearing 16 shown in FIG.
Then, the rotor shaft 14 and the bearing portion 17 are lubricated while passing down between the stator 11 and the rotor 12 while lubricating the rotor.

Then, the lubricating liquid is applied to the mechanical seal 31.
To the part where is formed. Most of the lubricating liquid is blocked by the mechanical seal 31, so that the lubricating liquid does not leak to the casing portion 4 and the piping 36
To the heat exchanger 5. Then, after the lubricating liquid is cooled by the heat exchanger 5, the piping 35 of the heat exchanger 5
And the lubricating liquid inlet 44 of the first lubricating liquid pot 1,
It is stored again in the first lubricating liquid pot 1. Further, a very small part of the lubricating liquid enters the casing part 4 while lubricating the mechanical seal 31 and the rotor shaft 14, and is discharged together with the liquid supply.

Next, the operation of replenishing the lubricant from the second lubricant pot 6 to the first lubricant pot 1 by the lubricant supply pipe 7 will be described. During operation of this pump, when the lubricating liquid is sufficiently stored in the first lubricating liquid pot 1, as shown in FIG. Is down.

When a long-time operation is performed, FIG.
The lubricating liquid in the first lubricating liquid pot 1 decreases because the lubricating liquid leaks little by little from the gap of the mechanical seal 31 shown in FIG. 6, and the lubricating liquid in the first lubricating liquid pot 1 as shown in FIG. The surface is lower than the upper part of the cross section 71a of the dip portion 71. At this time, the cross section 71
The inert gas in the first lubricating liquid pot 1 enters from a.
Then, the inert gas reaches the second lubricating liquid pot 6 via the lubricating liquid supply pipe 7. Further, with the invasion of the inert gas, the lubricating liquid in the second lubricating liquid pot 6 and the lubricating liquid supply pipe 7 flows into the first lubricating liquid pot 1, and the liquid level of the first lubricating liquid pot 1 is reduced. To raise. Then, the lubricating liquid is allowed to flow in until the liquid surface of the lubricating liquid in the first lubricating liquid pot 1 is in a state where the cross section 71a is submerged as shown in FIG.

Further, the operation is performed for a longer time,
When the amount of the lubricating liquid in the lubricating liquid pot 6 has decreased, the operator measures the amount of the lubricating liquid in the second lubricating liquid pot 6 with the level gauge 4.
After confirmation by 6a, the lid 8 of the second lubricating liquid pot 6 is opened, and the lubricating liquid is refilled into the second lubricating liquid pot 6. As described above, since the second lubricating liquid pot 6 is installed at a position that is easy for the operator to manage, the operator can check the amount of the lubricating liquid in the second lubricating liquid pot 6 and perform the second lubricating operation. It is possible to replenish the liquid pot 6 with the lubricating liquid very easily.

As described above, in this pump, the lubricating liquid
The first lubricating liquid pot 1, the drive unit 2 and the heat exchanger 5 are circulated. That is, in the present pump, it is not necessary to constantly inject the lubricating liquid during operation by reusing the lubricating liquid. Therefore, in this pump,
Operating costs can be kept low.

In the present pump, the pressure in the passage of the lubricating liquid is higher than the pressure in the casing 4. Therefore, the mechanical seal 31 and the rotor shaft 1
The amount of liquid sent into the drive unit 2 from the gap with the liquid supply 4 is extremely small. Therefore, since the lubricating liquid is not contaminated by the liquid supply, it is possible to prevent the failure of the drive unit 2.

In this pump, the first lubricating liquid pot 1
When the amount of the lubricating fluid in the inside decreases, the dip portion 71 of the lubricating fluid supply pipe 7 detects this decrease, and the second lubricating fluid pot 6
The lubricating liquid therein is supplied to the first lubricating liquid pot 1 via the lubricating liquid supply pipe 7. Therefore, the first
Even without monitoring the amount of the lubricating liquid and replenishing the lubricating liquid to the lubricating liquid pot 1, it is possible to prevent the failure of the drive unit 2 due to the shortage of the lubricating liquid.

In this pump, the first lubricating liquid pot 1
In order to detect the amount of the lubricating liquid in the above, a dip portion 71 having a simple configuration is used. Therefore, in the present pump, since it is not necessary to use an expensive sensor or the like for detecting the amount of the lubricating liquid, it is possible to suppress the manufacturing cost.

In this pump, the second lubricating liquid pot 6
However, the lubricating liquid used once is not stored in the second lubricating liquid pot 6 because it does not constitute a circulation system in the present pump. Therefore, even if the lubricating fluid in this pump is contaminated with impurities,
This dirt does not affect the second lubricating liquid pot 6. For this reason, in this pump, the level gauge 46a in the second lubricating liquid pot 6 is not contaminated, so that
The amount of the lubricating liquid in the second lubricating liquid pot 6 can always be displayed accurately.

In this pump, the second lubricating liquid pot 6
However, the first lubricating liquid pot 1 can store approximately twice the volume of the lubricating liquid. Therefore, it is not necessary to monitor the amount of the lubricating liquid in the second lubricating liquid pot 6 for a very long time. Therefore, with this pump, it is possible to keep the operating cost very low.

In the above embodiment, the present pump
The lubricating liquid is circulated and reused. However, the liquid pump of the present invention is not limited to this, and may have a configuration in which the lubricating liquid is not circulated, that is, a configuration in which the lubricating liquid is not reused. The liquid pump of the present invention can be applied to any pump provided with a lubricating liquid pot for storing a lubricating liquid.

In this pump, the first lubricating liquid pot 1
Although a level gauge 46 for displaying the amount of the lubricating liquid in the first lubricating liquid pot 1 is provided, the level gauge 46 is not always necessary. This is because the amount of the lubricating liquid in the present pump can be measured by the level gauge 46a in the second lubricating liquid pot 6.

In the above embodiment, the second lubricating liquid pot 6 is assumed to have approximately twice the capacity and the height of the first lubricating liquid pot 1.
The capacity is not limited to this. That is, the second lubricating liquid pot 6 only needs to be able to store a sufficient amount of lubricating liquid, and its height and capacity are not limited. The capacity of the second lubricating liquid pot 6 is preferably at least twice the capacity of the first lubricating liquid pot 1 in that the frequency of monitoring and replenishing the lubricating liquid can be reduced. In addition, the height of the second lubricating liquid pot 6 is preferably at least twice the height of the first lubricating liquid pot 1 in that the fluctuation of the liquid level in the lubricating liquid is easily monitored.

In the above embodiment, the second lubricating liquid pot 6 is provided with the level gauge 46a for monitoring the lubricating liquid. However, the configuration for monitoring the lubricating liquid in the second lubricating liquid pot 6 is not limited to this. That is, a see-through window (side glass) may be provided on the side surface of the second lubricating liquid pot 6. FIGS. 7A and 7B are explanatory views showing a configuration in which the second lubricating liquid pot 6 includes transparent windows 47 instead of the level gauge 46a. As shown in these figures,
The see-through window 47 is made of a tempered glass 91 formed of two gaskets (O
Ring) 92, and these gaskets 9
It is configured by sandwiching 2.92 between two flanges 93 and 94 and tightening the flanges 93 and 94 with bolts (not shown). Then, the lubricating liquid is monitored through the tempered glass 91. With the second lubricating liquid pot 6 having such a configuration, it is possible to reliably prevent the leakage of the lubricating liquid from the configuration for monitoring the lubricating liquid.

In the above embodiment, the first lubricating liquid pot 1 is filled with an inert gas and the gas pressure is applied, but the second lubricating liquid pot 6 is not filled with an inert gas. It has become. This is because the second lubricant pot 6 is sufficiently above the first lubricant pot 1,
This is because it is not necessary to pressurize the inside of the second lubricating liquid pot 6 with an inert gas in order to balance the lubricating liquid between the pots 1 and 6.

However, if necessary, the inside of the second lubricating liquid pot 6 may be pressurized with an inert gas. That is, in the above-described embodiment, the second lubricating liquid pot 6 is provided with the lid portion 8. However, the upper part of the second lubricating liquid pot 6 may have the same configuration as the upper part of the first lubricating liquid pot 1. Good. That is, the second lubricating liquid pot 6 is a closed system (closed system) provided with a gas pressurizing port, a gas depressurizing valve, and a lubricating liquid replenishing port at an upper portion thereof, and an inert gas is sealed therein. If necessary, the pressure of the inert gas in the second lubricating liquid pot 6 may be adjusted.

The lubricating liquid supply pipe 7 and the dip portion 7
The size (inner diameter, length, and the like) of 1 can be appropriately determined depending on the installation position of the second lubricating liquid pot 6, the properties of the lubricating liquid to be used, and the like. That is, it is easy for the operator to monitor the amount of the lubricating liquid in the second lubricating liquid pot 6 and to replenish the lubricating liquid, and to lubricate the first lubricating liquid pot 1 smoothly. Liquid supply pipe 7
Preferably, the size of the dip portion 71 is determined.

[0080]

As described above, the liquid pump according to the first aspect of the present invention is a liquid pump that uses a lubricating liquid different from the liquid supply for lubricating the drive unit that rotates the impeller. A first storage unit for storing the lubricating liquid and supplying a required amount of the lubricating liquid to the driving unit; and, when the amount of the lubricating liquid in the first storage unit becomes equal to or less than a predetermined amount, the first storage unit. And a lubricating fluid replenishing unit for replenishing the lubricating fluid into the first storage unit.

According to the above configuration, the lubricating fluid replenishing unit detects the amount of the lubricating fluid in the first storing unit, and when the amount becomes equal to or less than the predetermined amount, the lubricating fluid replenishing unit stores the lubricating fluid in the first storing unit. Lubricant is replenished. Therefore, in the above configuration,
The first storage section always stores a predetermined amount or more of the lubricating liquid. Thus, according to the above configuration, even if the operator does not monitor the amount of the lubricating fluid in the first storage unit or replenish the lubricating fluid, the lubricating fluid for the driving unit does not run short. Thus, it is possible to reduce the burden on the operator during driving.

In the liquid pump according to a second aspect of the present invention, in the configuration according to the first aspect, the lubricating liquid replenishing unit includes a second storing unit for storing a lubricating liquid, and a second storing unit. 2
A lubricating liquid supply unit for supplying a lubricating liquid from the storage unit to the first storage unit, and measuring the amount of the lubricating liquid in the first storage unit, and controlling the lubricating liquid supply unit based on the measurement result. And a liquid amount measuring unit for supplying the lubricating liquid from the second storage unit to the first storage unit.

In the above configuration, the liquid amount measuring unit measures the amount of the lubricating liquid in the first storage unit. Then, the liquid amount measuring unit controls the lubricating liquid supply unit based on the measurement result to supply the lubricating liquid from the second storage unit to the first storage unit. As described above, according to the above configuration, the lubricating liquid replenishing unit can be simply configured, so that the liquid pump according to the first aspect can be realized in addition to the effect of the first aspect. This has the effect of being easy.

The liquid pump according to claim 3 is
3. The liquid pump according to claim 2, wherein the second storage unit is provided above the first storage unit, and the lubricating liquid supply unit is inserted into the first storage unit. A pipe having a first end and a second end inserted into the lubricating fluid in the second reservoir, wherein the fluid quantity measuring unit comprises a first end in the lubricating fluid supply unit. A wedge-shaped pipe provided at the tip of the section and inserted into the lubricating fluid in the first storage section.

According to the above configuration, the lubricating liquid supply unit and the liquid amount measurement unit according to claim 2 can be realized with a very simple configuration. Therefore, according to the configuration, in addition to the effect of the second aspect, the liquid pump according to the second aspect can be realized very easily and at low cost. .

The liquid pump according to claim 4 is
In addition to the liquid pump according to any one of claims 1 to 3, the lubricating fluid supplied to the drive unit from the first storage unit and lubricating the drive unit is stored in the first storage unit again. And a lubricating liquid circulating section for the purpose.

According to the above configuration, by reusing the lubricating liquid, it is not necessary to constantly inject the lubricating liquid during the operation. Therefore, in addition to the effects of the first to third aspects, there is an effect that the operating cost can be reduced. Further, in the above configuration, since the used lubricating liquid does not enter the lubricating liquid replenishing unit, the lubricating liquid replenishing unit is not contaminated by the used lubricating liquid.

The liquid pump according to claim 5 is
The liquid pump according to any one of claims 2 to 4, wherein the second storage unit includes a liquid amount display unit for displaying a lubricating liquid amount in the second storage unit. . Thereby, in addition to the effects of the second to fourth aspects, there is an effect that the operator can accurately and easily grasp the liquid amount in the second storage unit.

Further, as described above, the second storage section can be installed at a position desired by the operator.
Therefore, according to the above configuration, even when a configuration other than the second storage unit is installed in a hard-to-reach place, the operator can easily grasp the amount of the lubricating liquid. Is also played. In addition, when the liquid pump is of a type that reuses the lubricating liquid, the used lubricating liquid is not mixed into the second storage unit. The liquid amount display section is not contaminated. Therefore, in the above configuration, it is possible to reliably display the amount of the lubricating liquid.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a first lubricating liquid pot, a second lubricating liquid pot, and a lubricating liquid supply pipe in a liquid pump according to one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a liquid pump according to one embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a configuration of a drive unit, a casing unit, and a heat exchanger in the liquid pump shown in FIG.

FIG. 4 is an explanatory view showing a configuration of a dip portion provided at a distal end portion of the lubricating liquid supply pipe shown in FIG.

FIG. 5 is an explanatory view showing a state where the dip portion shown in FIG. 4 is in the lubricating liquid of the first lubricating liquid pot.

6 is an explanatory view showing a state in which a part of the cross section of the dip portion shown in FIG. 4 is outside the lubricating liquid of the first lubricating liquid pot.

7 (a) is a front view showing a configuration in which the second lubricating liquid pot shown in FIG. 2 is provided with a see-through window instead of a level gauge, and FIG. 7 (b) is a front view. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st lubricating liquid pot (1st storage part) 2 drive part 4 casing part 5 heat exchanger (lubricating liquid circulation part) 6 2nd lubricating liquid pot (lubricating liquid replenishment part, 2nd storage part) 7 lubricating liquid Supply pipe (lubricating liquid replenishing unit, lubricating liquid supplying unit, pipe) 8 lid 11 stator 12 rotor 13 rotor shaft 14 rotor shaft 15 auxiliary impeller (lubricating liquid circulating unit) 16 bearing unit 17 bearing unit 24 impeller 35 piping (lubricating liquid) (Circulation part) 36 Piping (lubricating liquid circulation part) 46 Level gauge (liquid amount display part) 47 Viewing window (liquid amount display part) 71 Dip part (lubricant replenishment part, liquid amount measurement part, wedge-shaped pipe) 81 Handle

Claims (5)

[Claims] 1. A liquid pump that uses a lubricating liquid different from the liquid supply for lubricating a driving unit for rotating an impeller, stores the lubricating liquid, and supplies a necessary amount of the lubricating liquid to the driving unit. And a lubricating fluid replenishing unit for replenishing the first storing unit with lubricating fluid when the amount of lubricating fluid in the first storing unit falls below a predetermined amount. A liquid pump characterized by the above-mentioned. 2. The lubricating liquid replenishing unit includes a second storing unit for storing a lubricating liquid, a lubricating liquid supplying unit for supplying a lubricating liquid from the second storing unit to the first storing unit. A liquid amount measuring unit that measures the amount of the lubricating liquid in the first storage unit and controls the lubricating liquid supply unit to supply the lubricating liquid from the second storage unit to the first storage unit based on the measurement result; The liquid pump according to claim 1, further comprising: 3. The second storage section is provided above the first storage section. The lubricating liquid supply section includes a first end inserted into the first storage section, A pipe having a second end inserted into the lubricating liquid in the second storage section, wherein the liquid amount measuring section is provided at a tip of the first end in the lubricating liquid supply section; The liquid pump according to claim 2, comprising a wedge-shaped pipe inserted into the lubricating liquid in the first storage unit. 4. The power supply from the first storage unit to a driving unit,
The liquid pump according to any one of claims 1 to 3, further comprising a lubricating liquid circulating unit for storing the lubricating liquid in which the driving unit is lubricated again in the first storage unit. 5. The liquid storage device according to claim 2, wherein the second storage unit includes a liquid amount display unit for displaying a lubricating liquid amount in the second storage unit. The liquid pump as described.