JP2022172785A - horizontal shaft pump - Google Patents

Abstract

To shorten the duration of an air-water mixing operation state in a horizontal shaft pump.SOLUTION: A horizontal shaft pump 1 comprises a pump casing 2, a motor 10 arranged on the downstream side of a suction port 3 in an internal space 17 of the pump casing 2, and an impeller 18 arranged on the upstream side where the suction port 3 is located in the internal space 17. The impeller 18 is constituted so as to discharge flowing water sucked from the suction port 3, toward a discharge port 4 through the internal space 17. The pump casing 2 is provided with an exhaust part 20 communicating with the internal space 17 for exhausting air accumulated in the internal space 17 to the outside. The exhaust part 20 is arranged on the downstream side of the position of the impeller 18.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to horizontal shaft pumps.

2. Description of the Related Art Conventionally, as a full-speed, full-water-level horizontal shaft pump that can be installed in a running water channel or a water tank, there has been proposed a horizontal shaft pump as disclosed in Patent Document 1, for example.

Specifically, Patent Document 1 discloses a pump casing having a suction port and a discharge port, a motor and a rotating shaft arranged in the pump casing, and a motor and a rotating shaft arranged on the suction port side in the pump casing and fixed to the rotating shaft. and an impeller that is rotatable by driving a motor in a state in which the horizontal shaft pump is provided.

JP 2006-029107 A

By the way, in a full-speed, full-water level horizontal shaft pump as in Patent Document 1, when the impeller is not sufficiently immersed in running water in the pump casing, when the operating water level reaches such that the horizontal shaft pump sucks air, the blades As the vehicle rotates, it enters an operating state in which both running water and air are simultaneously sucked through the suction port of the pump casing (that is, an air-water mixed operating state).

In the horizontal shaft pump, for example, when the water level inside the pump casing is falling, the impeller may not be sufficiently submerged in water inside the pump casing. In such a state, the impeller draws in air together with the running water, and so-called air stagnation tends to occur in the pump casing. This air pool reduces the drainage capacity of the horizontal shaft pump. As a result, the horizontal shaft pump continues the air-water mixing operation until the water level reaches the standby operation state after the draining capacity is exhausted.

On the other hand, for example, when the water level in the pump casing rises from the standby operation state, the operation state is shifted to the normal operation state after passing through the air-water mixed operation state. However, when the water level in the pump casing rises, most of the impeller in the pump casing is submerged in water, and the air that has accumulated in the space behind the impeller in the pump casing is discharged. Unless the air is exhausted to the outside from the outlet, it does not normally transition to the normal operating state. As a result, the horizontal shaft pump continues the air-water mixed operation state.

Here, for example, in rainwater drainage pump stations where horizontal shaft pumps are applied, it is common to use the horizontal shaft pumps for a long period of time, and it is required to keep the horizontal shaft pumps usable for a long period of time. However, with a conventional full-speed, full-water level horizontal shaft pump, if the duration of the air-water mixed operation increases, the vibration generated in the air-water mixed operation will damage the bearings, increase the vibration of the shaft, Part loosening may occur. That is, in the horizontal shaft pump, it is not preferable that the air-water mixed operation state continues for a long period of time. For this reason, the conventional horizontal shaft pump needs to be improved to shorten the duration of the air-water mixed operation state as much as possible.

The present disclosure has been made in view of the above points, and an object thereof is to shorten the duration of the air-water mixing operation state in the horizontal shaft pump.

To achieve the above objectives, the first disclosure is a horizontal shaft pump that can be installed in a running water channel or a water tank, and has an upstream suction port and a downstream discharge port. a pump casing provided with an internal space for communicating a suction port and a discharge port; a motor disposed downstream of the suction port in the internal space; and a motor disposed upstream of the suction port in the internal space, and an impeller rotatable by being driven by a motor. The impeller is configured to allow running water sucked from the suction port to pass through the internal space and be discharged toward the discharge port. The pump casing is provided with at least one exhaust part communicating with the internal space to discharge the air accumulated in the internal space to the outside, and the exhaust part is located downstream of the position of the impeller. are placed.

In the first disclosure, at least one exhaust communicates with the interior space of the pump casing and is arranged downstream of the position of the impeller in the pump casing. With this configuration, for example, when the water level in the internal space is falling, the air accumulated in the internal space of the pump casing is quickly exhausted from the exhaust section toward the outside by the internal pressure of the internal space. By continuing this exhaust, the exhaust portion located downstream of the impeller position eliminates air accumulation in the internal space, making it easier to maintain a state in which the internal space is filled with running water. As a result, the running water in the internal space is discharged from the discharge port until the water level reaches a low level. That is, the drainage capacity of the horizontal shaft pump is maintained. As a result, the duration of the air-water mixed operation state is shortened, and the transition to the standby operation state occurs early.

In addition, in the first disclosure, in the standby operation state, the running water in the internal space is not discharged from the discharge port, but the air accumulated in the internal space is discharged to the outside from the exhaust part. By continuing this exhaust, the internal space located behind the impeller is kept filled with running water.

Furthermore, in the first disclosure, even when the water level in the internal space is rising, the air accumulated in the internal space is quickly exhausted from the exhaust section toward the outside by the internal pressure of the internal space. By continuing this evacuation, the running water in the internal space is filled up to a water level at which the impeller is fully immersed in the running water. Then, when the impeller is sufficiently submerged in the running water in the internal space, the running water in the internal space is immediately discharged from the discharge port. As a result, the continuation time of the air-water mixed operating state is shortened, and the normal operating state can be transitioned to at an early stage.

As described above, in the first disclosure, the air accumulated in the internal space is discharged from the exhaust portion toward the outside, so that the duration of the air-water mixed operation state can be shortened. As a result, it is possible to keep the horizontal shaft pump usable for a long period of time, for example in a rainwater pumping station.

In a second disclosure, in the first disclosure, the impeller is arranged so that its center of rotation coincides with the axis of the pump casing, and the exhaust part is located above the center of rotation of the impeller in the pump casing. are placed in

In this second disclosure, the air accumulated in the internal space is exhausted to the outside from the exhaust portion positioned above the rotation center of the impeller in the pump casing. Thereby, for example, when the water level in the internal space is rising, it is possible to position the water level in the internal space above the center of rotation of the impeller. That is, the impeller can be sufficiently submerged in running water in the internal space. As a result, the continuation time of the air-water mixed operating state is shortened, and the normal operating state can be transitioned to at an early stage.

In a third disclosure, in the second disclosure, the exhaust section is arranged above the water level in the internal space when most of the impeller is submerged in the running water in the internal space.

In this third disclosure, the air accumulated in the internal space is exhausted to the outside from the exhaust part located above the water level in the internal space when most of the impeller is submerged in the running water in the internal space. This makes it easier to keep most of the impeller submerged in the running water in the interior space, for example, when the water level in the interior space is rising. As a result, the continuation time of the air-water mixed operating state is shortened, and the normal operating state can be transitioned to at an early stage.

A fourth disclosure is any one of the first to third disclosures, further comprising a motor casing arranged in the internal space and formed to surround the entire circumference of the motor. The motor is provided with a shaft that is rotatable by being driven by the motor. The motor is arranged so that the rotation center of the shaft coincides with the axis of the pump casing. The exhaust part is arranged above the water level in the internal space when the motor casing is submerged in the running water in the internal space to a position corresponding to the rotation center of the shaft.

In this fourth disclosure, when the motor casing is immersed in the running water in the internal space to a position corresponding to the rotation center of the shaft, the air accumulated in the internal space is discharged from the exhaust part located above the water level in the internal space. exhausted to the outside. This ensures that at least half of the motor casing is submerged in the running water in the interior space, for example when the water level in the interior space is rising. As a result, the heat emitted from the motor can be received by the running water in the internal space.

According to a fifth disclosure, in the fourth disclosure, the exhaust portion is arranged above the water level in the interior space when most of the motor casing is submerged in running water in the interior space.

In the fifth disclosure, the air accumulated in the internal space is exhausted to the outside from the exhaust part located above the water level in the internal space when most of the motor casing is submerged in the running water in the internal space. This makes it possible, for example when the water level in the interior space is rising, to have a large part of the motor casing submerged in the running water of the interior space. As a result, the heat emitted from the motor can be received by the running water in the internal space.

In a sixth disclosure, in any one of the first to fifth disclosures, the exhaust portion is configured by at least one through-hole passing through the pump casing.

According to the sixth disclosure, the simple configuration such as the through-hole allows the air accumulated in the internal space of the pump casing to be properly discharged to the outside.

A seventh disclosure is according to any one of the first to fifth disclosures, wherein the exhaust section is configured by a pipe section that communicates with the internal space and extends horizontally from the outer peripheral surface of the pump casing.

In this seventh disclosure, the air accumulated in the internal space of the pump casing can be discharged from the pipe portion to the outside according to the conditions of the water channel or water tank in which the horizontal shaft pump is installed, by a simple configuration of the pipe portion extending in the horizontal direction. The air can be exhausted while being guided horizontally toward the

In an eighth disclosure, in any one of the first to fifth disclosures, the exhaust portion includes at least one through hole that penetrates the pump casing, and a substantially L-shaped exhaust portion that communicates with the through hole and is fixed to the pump casing. a shaped elbow member.

In the eighth disclosure, the simple configuration of the through hole and the elbow member allows the air accumulated in the internal space of the pump casing to be discharged while being guided outward from the through hole and the elbow member in a predetermined direction. can.

In a ninth disclosure, in the eighth disclosure, the elbow member is configured such that one end is fixed to the outer peripheral surface of the pump casing and the other end opens upward.

In this ninth disclosure, an elbow member whose other end is open upward allows the air accumulated in the internal space of the pump casing to flow through the through hole and the elbow depending on the condition of the water channel or water tank in which the horizontal shaft pump is installed. It is possible to appropriately exhaust the air while guiding it upward from the member toward the outside.

In a tenth disclosure based on the eighth disclosure, the elbow member is configured such that one end is fixed to the outer peripheral surface of the pump casing and the other end opens downward.

In this tenth disclosure, the elbow member having the other end opened downward allows the air accumulated in the internal space of the pump casing to flow through the through hole and the elbow depending on the condition of the water channel or water tank in which the horizontal shaft pump is installed. It is possible to appropriately exhaust the air while guiding it downward from the member toward the outside.

As described above, according to the present disclosure, it is possible to shorten the duration of the air-water mixing operation state in the horizontal shaft pump.

1 is an overall perspective view of a horizontal shaft pump according to an embodiment of the present disclosure; FIG. FIG. 2 is a sectional view taken along line II--II of FIG. FIG. 3 is a side view of the horizontal shaft pump illustrating how the water level in the internal space is dropping. FIG. 4 is a view equivalent to FIG. 3 exemplifying the water level in the internal space in the standby operation state. FIG. 5 is a view corresponding to FIG. 3 exemplifying how the water level in the internal space rises. FIG. 6 is a sectional view taken along line VI-VI of FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 5. FIG. FIG. 8 is a view equivalent to FIG. 7 showing Modification 1 of the embodiment of the present disclosure. FIG. 9 is a view equivalent to FIG. 7 showing Modification 2 of the embodiment of the present disclosure. FIG. 10 is a view equivalent to FIG. 7 showing Modification 3 of the embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail based on the drawings. The following description of the embodiments is merely exemplary in nature and is not intended to limit the present disclosure, its applications or uses.

(horizontal shaft pump)
FIG. 1 shows an overall horizontal shaft pump 1 according to an embodiment of the present disclosure. The horizontal shaft pump 1 is a full-speed, full-water level submersible pump that can be installed in a running water channel or a water tank. The horizontal shaft pump 1 is configured, for example, as part of a pump gate system (not shown) provided in the middle of a drainage route connecting a waterway and a river. Note that the above-mentioned "full speed and full water level" means that the engine can be operated at the rated rotation speed at all water levels except the water level at which it will run dry.

The horizontal shaft pump 1 is constructed so that the axis A illustrated in FIGS. 1 to 5 extends in a direction intersecting the vertical direction. In the following description, the side on which the suction port 3 (to be described later) is located may be referred to as the upstream side of the horizontal shaft pump 1 , while the side on which the discharge port 4 (to be described later) is located may be referred to as the downstream side of the horizontal shaft pump 1 . .

(rectifier)
As shown in FIGS. 1 to 5, the horizontal shaft pump 1 is provided with a current plate 7 . The straightening plate 7 is attached to the suction port 3 of the pump casing 2 which will be described later. The rectifying plate 7 is a member for guiding the low-level running water to the suction port 3 and is configured to cover both the left and right sides and the upper side of the suction port 3 . The rectifying plate 7 may be formed by machining (such as press working) using a single flat plate material, or may be formed by joining or assembling a plurality of flat plate materials.

(fixed drainage pipe)
As shown in FIGS. 1-5, the horizontal shaft pump 1 is provided with a fixed drain pipe 8 . The fixed drain pipe 8 is attached to the discharge port 4 of the pump casing 2, which will be described later. The fixed drain pipe 8 is configured as part of a communication pipe that horizontally penetrates a gate door (not shown). By connecting the horizontal shaft pump 1 to the fixed drainage pipe 8, a drainage facility in which the gate door (not shown) and the horizontal shaft pump 1 are integrated is formed. The fixed drain pipe 8 is configured such that a portion (flange portion) facing the discharge port 4 engages with an engaging member 6 described later.

(pump casing)
As shown in FIGS. 1-5, the horizontal shaft pump 1 has a pump casing 2 . The pump casing 2 has a substantially cylindrical shape (see FIGS. 6 and 7). The pump casing 2 extends along the direction in which the axis A extends.

The pump casing 2 of this embodiment is composed of first to fourth casing portions 2a to 2d. The first to fourth casing parts 2a to 2d are arranged in order from the first casing part 2a to the fourth casing part 2d from the upstream side to the downstream side.

The pump casing 2 has a suction port 3 and a discharge port 4 . Specifically, the suction port 3 is configured as an opening located on the left side of the paper surface of FIG. 2 of the first casing portion 2a. The discharge port 4 is configured as an opening located on the right side of the paper surface of FIG. 2 of the fourth casing portion 2d.

An underwater cable 5 for supplying electric power to a motor 10, which will be described later, is connected to the upper portion of the third casing portion 2c. Further, an engaging member 6 for attaching a fixed drain pipe 8, which will be described later, to the discharge port 4 side of the pump casing 2 (fourth casing portion 2d) is provided in the upper portion of the fourth casing portion 2d near the discharge port 4. ing.

(motor and shaft)
As shown in FIG. 2 , the horizontal shaft pump 1 has a motor 10 and a shaft 11 . The motor 10 and shaft 11 are housed inside a motor casing 12 which will be described later. The motor 10 is arranged downstream of the suction port 3 in an internal space 17 (described later) of the pump casing 2 . The shaft 11 is configured to be rotatable by being driven by the motor 10 . The motor 10 is arranged such that the rotation center of the shaft 11 coincides with the position of the axis A in the pump casing 2 .

(motor casing)
The horizontal shaft pump 1 has a motor casing 12 . The motor casing 12 is arranged downstream of the suction port 3 in an internal space 17 (described later) of the pump casing 2 . The motor casing 12 has a substantially cylindrical shape configured to surround the entire circumference of the motor 10 . The longitudinal direction of the motor casing 12 extends along the extending direction of the axis A. As shown in FIG. The motor casing 12 is configured to be supported by the third casing portion 2c (see FIG. 2).

(first and second bearings)
The horizontal shaft pump 1 has a first bearing 13 and a second bearing 14 for rotatably supporting the shaft 11 . The first bearing 13 is attached to an intermediate portion of the shaft 11 near the end located on the upstream side. The first bearing 13 is composed of, for example, two bearings. The second bearing 14 is attached to the end of the shaft 11 located downstream of the motor 10 . The second bearing 14 is composed of, for example, one bearing.

(First and second bearing support parts)
The horizontal shaft pump 1 includes a first bearing support portion 15 for supporting the first bearing 13 and a second bearing support portion 16 for supporting the second bearing 14 . The first bearing support portion 15 is configured to surround the outer peripheral surface of the first bearing 13 from the outside. The second bearing support portion 16 is configured to surround the outer peripheral surface of the second bearing 14 from the outside.

In this embodiment, the first bearing support portion 15 is configured as a separate member from the motor casing 12 and is attached to the upstream end of the motor casing 12 . On the other hand, the second bearing support portion 16 is configured as a part of the motor casing 12 and formed integrally with the downstream end portion of the motor casing 12 .

(internal space)
As shown in FIG. 2, the pump casing 2 is provided with an internal space 17 . The internal space 17 communicates with the suction port 3 and the discharge port 4 . As shown in FIG. 7 , around the motor casing 12 , an internal space 17 is configured as a substantially annular space in cross section located between the inner peripheral surface of the pump casing 2 and the outer peripheral surface of the motor casing 12 . there is With this configuration, the running water in the internal space 17 receives the heat generated in the motor 10 through the motor casing 12 .

(impeller)
As shown in FIGS. 2-6, the horizontal shaft pump 1 has an impeller 18 . The impeller 18 is arranged upstream of the suction port 3 in the internal space 17 of the pump casing 2 . Specifically, the impeller 18 is attached to the end of the shaft 11 located upstream of the motor 10 . The impeller 18 is attached to the upstream end of the first bearing support portion 15 .

The impeller 18 is arranged so that its center of rotation coincides with the position of the axis A. As shown in FIG. The impeller 18 is rotatable together with the rotation of the shaft 11 by being driven by the motor 10 . The impeller 18 is configured to pressurize the running water sucked from the suction port 3 and discharge the running water toward the discharge port 4 through the internal space 17 . In the schematic longitudinal sectional view shown in FIG. 6, illustration of the motor 10, the shaft 11, and the motor casing 12 is omitted in order to emphasize the configuration of the impeller 18. As shown in FIG.

In the internal space 17 , the closer the impeller 18 is located (the side where the suction port 3 is located), the more likely it is to be affected by the pressurization of the flowing water and air by the impeller 18 . That is, in the internal space 17, the internal pressure of the internal space 17 tends to be higher on the upstream side (the side where the suction port 3 is located) than on the downstream side (the side where the discharge port 4 is located).

(Exhaust part)
As a characteristic configuration of the present disclosure, as shown in FIGS. 1 to 7, the pump casing 2 is provided with an exhaust section 20 for discharging air accumulated in the internal space 17 to the outside. The exhaust part 20 is arranged downstream of the position of the impeller 18 .

As shown in FIGS. 1 to 5, in the embodiment of the present disclosure, the exhaust section 20 consists of two through holes 21, 21 provided in the pump casing 2. As shown in FIGS. As shown in FIGS. 6 and 7, the through holes 21, 21 are formed on the left and right side portions of the third casing portion 2c when viewed in vertical cross section. Each through hole 21 extends horizontally through the third casing portion 2c. Each through hole 21 communicates with the internal space 17 . The through-holes 21, 21 are line-symmetrical (left-right symmetrical) with respect to the vertical center line of the third casing portion 2c in a vertical cross-sectional view.

As shown in FIGS. 1 to 5, each through hole 21 has a substantially circular shape. The diameter of each through hole 21 is preferably about 30 mm. As a result, the air accumulated in the internal space 17 can be easily exhausted to the outside, and a decrease in pump efficiency can be suppressed. On the other hand, if the diameter of each through-hole 21 exceeds 30 mm, the pump efficiency of the horizontal shaft pump may decrease.

As shown in FIG. 6, the through holes 21, 21 (exhaust portion 20) are preferably arranged above the center of rotation of the impeller 18 in the third casing portion 2c (pump casing 2). More preferably, the through-holes 21, 21 (exhaust part 20) are located at the water level of the internal space 17 (for example, WL1 shown in FIGS. 5 and 6) when most of the impeller 18 is submerged in the running water of the internal space 17 ) above. Note that the above-mentioned "when most of the impeller 18 is immersed in the running water of the internal space 17" specifically refers to a state in which 80% or more of the impeller 18 is immersed in the running water of the internal space 17. shall be

As shown in FIG. 7, the through-holes 21, 21 (exhaust portion 20) are formed when the third casing portion 2c (motor casing 12) is submerged in the running water of the internal space 17 up to a position corresponding to the rotation center of the shaft 11. , preferably above the water level in the interior space 17 . More preferably, the through-holes 21, 21 (exhaust part 20) are set at the water level of the internal space 17 (for example, Fig. 5 and WL1) shown in FIG. Note that the above-mentioned "when most of the motor casing 12 is submerged in the running water of the internal space 17" specifically refers to a state in which 80% or more of the motor casing 12 is submerged in the running water of the internal space 17. shall be

[Action and effect of the embodiment]
In the horizontal shaft pump 1 , the exhaust section 20 communicates with the internal space 17 of the pump casing 2 and is arranged downstream of the position of the impeller 18 in the pump casing 2 . According to this configuration, as illustrated in FIG. 3, when the water level in the internal space 17 drops from WL1 to WL2, the air accumulated in the internal space 17 of the pump casing 2 is exhausted by the internal pressure of the internal space 17. It is quickly exhausted from the portion 20 to the outside (see arrow E shown in FIG. 3). By continuing this exhaustion, air accumulation in the internal space 17 is eliminated by the exhaust part 20 located downstream of the position of the impeller 18, and the state in which the internal space 17 is filled with water can be easily maintained. As a result, the running water in the internal space 17 is discharged from the discharge port 4 until the water level reaches a low level (see arrow D shown in FIG. 3). That is, the drainage capacity of the horizontal shaft pump 1 is maintained. As a result, the duration of the air-water mixed operation state is shortened, and the transition to the standby operation state occurs early.

Further, as illustrated in FIG. 4 , in the standby operation state, the running water in the internal space 17 is not discharged from the discharge port 4 , but the air accumulated in the internal space 17 is discharged to the outside through the exhaust portion 20 . By continuing this exhaust, the internal space 17 located behind the impeller 18 is maintained in a state filled with running water (for example, the water level WL2) to the extent that it can quickly shift to a normal operation state when the water level rises. be done.

Furthermore, as illustrated in FIG. 5, even when the water level in the internal space 17 rises from WL2 to WL1, the air accumulated in the internal space 17 is released from the exhaust section 20 to the outside due to the internal pressure of the internal space 17. (see arrow E shown in FIG. 5). By continuing this evacuation, the running water in the internal space 17 is filled up to the water level WL2 at which the impeller 18 is sufficiently submerged in the running water. Then, when the impeller 18 is fully submerged in the running water in the internal space 17, the running water in the internal space 17 is immediately discharged from the discharge port 4 (see arrow D shown in FIG. 5). As a result, the continuation time of the air-water mixed operating state is shortened, and the normal operating state can be transitioned to at an early stage.

As described above, in the horizontal shaft pump 1 according to the embodiment of the present disclosure, the air accumulated in the internal space 17 is exhausted from the exhaust unit 20 to the outside, thereby shortening the duration of the air-water mixed operation state. be able to. As a result, the horizontal shaft pump 1 can be kept usable for a long period of time, for example, at a rainwater pumping station.

Further, the exhaust part 20 is preferably arranged above the center of rotation of the impeller 18 in the pump casing 2 . That is, the air accumulated in the internal space 17 is exhausted to the outside from the exhaust portion 20 positioned above the rotation center of the impeller 18 . Thereby, for example, when the water level in the internal space 17 is rising, the water level in the internal space 17 can be positioned above the center of rotation of the impeller 18 . That is, the impeller 18 can be sufficiently submerged in running water in the internal space 17 . As a result, the continuation time of the air-water mixed operating state is shortened, and the normal operating state can be transitioned to at an early stage.

Furthermore, the exhaust part 20 is positioned above the water level of the internal space 17 (for example, WL1 shown in FIGS. 5 and 6) when most of the impeller 18 is submerged in the running water of the internal space 17. more preferred. That is, the air accumulated in the internal space 17 is discharged outside from the exhaust part 20 positioned above the water level of the internal space 17 when most of the impeller 18 is submerged in the running water of the internal space 17. - 特許庁Thereby, for example, when the water level in the internal space 17 is rising, it becomes easy to maintain a state in which most of the impeller 18 is submerged in the running water in the internal space 17 . As a result, the continuation time of the air-water mixed operating state is shortened, and the normal operating state can be transitioned to at an early stage.

Moreover, the exhaust part 20 is preferably arranged above the water level in the internal space 17 when the motor casing 12 is submerged in the running water in the internal space 17 to a position corresponding to the rotation center of the shaft 11 . That is, the air accumulated in the internal space 17 is removed from the exhaust section 20 located above the water level in the internal space 17 when the motor casing 12 is submerged in the running water in the internal space 17 up to a position corresponding to the rotation center of the shaft 11 . exhausted to the outside. This allows at least half of the motor casing 12 to be submerged in the running water in the interior space 17, for example when the water level in the interior space 17 is rising. As a result, the heat generated from the motor 10 can be received by the running water in the internal space 17 . By filling the internal space 17 with running water, a mechanical seal (not shown) is lubricated.

Furthermore, it is more preferable that the exhaust part 20 is arranged above the water level of the internal space 17 when most of the motor casing 12 is submerged in the running water of the internal space 17 . In this way, the air accumulated in the internal space 17 is discharged outside from the exhaust part 20 located above the water level in the internal space 17 when most of the motor casing 12 is submerged in the running water in the internal space 17. exhausted. This allows most of the motor casing 12 to be submerged in the running water in the interior space 17, for example, when the water level in the interior space 17 is rising. As a result, the heat generated from the motor 10 can be received by the running water in the internal space 17 .

Further, in the embodiment of the present disclosure, the exhaust section 20 is configured by through holes 21 , 21 passing through the pump casing 2 . With such a simple configuration of the through holes 21, 21, the air accumulated in the internal space 17 of the pump casing 2 can be properly exhausted to the outside.

[Modification 1 of Embodiment]
In the above-described embodiment, the exhaust part 20 has two through holes 21, 21, but the configuration is not limited to this. For example, the exhaust portion 20 may be configured as a pipe portion that communicates with the internal space 17 and extends horizontally from the outer peripheral surface of the pump casing 2 .

Specifically, in Modified Example 1 shown in FIG. 8 , the exhaust portion 20 has a single casting hole 22 (pipe portion) formed integrally with the pump casing 2 . The cast-out hole 22 is formed in the side portion (the side portion located on the right side of the paper surface of FIG. 8) of the third casing portion 2c when viewed in longitudinal section. Moreover, the casting hole 22 is formed in a substantially cylindrical shape extending in the horizontal direction. In this modification, the air accumulated in the internal space 17 is removed by casting according to the condition of the water channel or water tank in which the horizontal shaft pump 1 is installed, due to the simple configuration of the cast-out hole 22 (pipe portion extending in the horizontal direction). It is possible to exhaust the air while guiding it in the horizontal direction toward the outside from the vent hole 22 (pipe portion).

Note that the pipe portion is not limited to the cast hole 22 shown in FIG. For example, in place of the cast-out hole 22, a straight pipe member (not shown), which is not shown, is communicated with the through hole 21 described in the above embodiment, and is horizontally displaced from the outer peripheral surface of the pump casing 2. It is good also as the form fixed to this outer peripheral surface so that it may extend. A plurality of casting holes 22 may be provided.

[Modification 2 of Embodiment]
Further, as in Modification 2 shown in FIG. 9, the outer periphery of the pump casing 2 is connected in a state in which a substantially L-shaped elbow member 23 is communicated with one through hole 21 similar to that described in the above embodiment. It may be fixed to a surface. Specifically, the elbow member 23 of this modified example is configured such that one end portion 23a is fixed to the outer peripheral surface of the pump casing 2 by, for example, welding, while the other end portion 23b opens upward. .

In this modification, the simple configuration of the through hole 21 and the elbow member 23 guides the air accumulated in the internal space 17 of the pump casing 2 from the through hole 21 and the elbow member 23 to the outside in a predetermined direction. can be exhausted. In particular, in this modification, the elbow member 23 whose other end 23b opens upward allows the air accumulated in the internal space 17 to flow through the through hole 21 depending on the condition of the water channel or water tank in which the horizontal shaft pump 1 is installed. And the air can be properly exhausted while being guided upward from the elbow member 23 toward the outside. A plurality of through holes 21 and elbow members 23 may be provided.

[Modification 3 of Embodiment]
Furthermore, as a further modification of Modification 2, the elbow member 23 may be configured as in Modification 3 shown in FIG. Specifically, the elbow member 23 of this modified example is configured such that one end portion 23a is fixed to the outer peripheral surface of the pump casing 2, while the other end portion 23b opens downward. With such a configuration, in this modification, the air accumulated in the internal space 17 is guided downward from the through hole 21 and the elbow member 23 to the outside according to the condition of the water channel or water tank in which the horizontal shaft pump 1 is installed. can be properly vented. It should be noted that a plurality of through-holes 21 and elbow members 23 may be provided in the same manner as in Modification 2 above.

[Other embodiments]
In the above-described embodiment, the exhaust part 20 has two through-holes 21, 21, but the configuration is not limited to this. That is, the exhaust part 20 may be configured with only one through hole 21 . That is, as long as the pump casing 2 is provided with at least one through-hole 21, the above effects of the exhaust section 20 described in the above embodiment can be obtained.

Moreover, although the form which provided the through-holes 21 and 21 (exhaust part 20) in the 3rd casing part 2c was shown in the said embodiment, it is not restricted to this form. That is, if at least one through-hole 21 is provided in any one of the second to fourth casing portions 2b to 2d, the above effects can be obtained.

Also, the exhaust part 20 may be configured with three or more through holes 21 . In this case, the plurality of through-holes 21 may be spaced apart from each other along the longitudinal direction of the pump casing 2 (extending direction of the axis A). By doing so, the air accumulated in the internal space 17 can be efficiently exhausted by the plurality of through holes 21 .

Moreover, although each through-hole 21 showed the form penetrated horizontally with respect to the 3rd casing part 2c in the said embodiment, it is not restricted to this form. For example, each through-hole 21 may be formed to penetrate in the thickness direction of the third casing portion 2c (the radial direction of the pump casing 2).

Further, in the above-described embodiment, the through hole 21 has a substantially circular opening, but the present invention is not limited to this form. For example, the opening of the through hole 21 may be formed in a polygonal shape such as a triangular shape or a square shape.

By the way, as described in the above embodiment, in the internal space 17, the internal pressure of the internal space 17 is higher on the upstream side (the side where the suction port 3 is located) than on the downstream side (the side where the discharge port 4 is located). tend to be higher. In view of this, in order to increase the exhaust capacity of the through hole 21 (exhaust portion 20), the through hole 21 may be arranged in the vicinity of the downstream side where the impeller 18 is located (for example, the first casing portion 2b). good.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the present disclosure.

INDUSTRIAL APPLICABILITY The present disclosure can be industrially applied as a full-speed, full-water level horizontal shaft pump that can be installed, for example, in a running water channel or a water tank.

1: Horizontal shaft pump 2: Pump casing 3: Suction port 4: Discharge port 5: Submersible cable 7: Current plate 10: Motor 11: Shaft 12: Motor casing 17: Internal space 18: Impeller 20: Exhaust part 21: Penetration Hole 22: casting hole 23: elbow member

Claims (10)

A horizontal shaft pump that can be installed in a running water channel or a water tank,
a pump casing having a suction port located upstream and a discharge port located downstream, and provided with an internal space for communicating the suction port and the discharge port;
a motor arranged downstream of the suction port in the internal space;
an impeller disposed upstream of the suction port in the internal space and rotatable by driving the motor;
The impeller is configured to discharge flowing water sucked from the suction port through the internal space toward the discharge port,
The pump casing is provided with at least one exhaust section that communicates with the internal space and discharges air accumulated in the internal space to the outside,
The horizontal shaft pump, wherein the exhaust section is arranged downstream of the position of the impeller. A horizontal shaft pump according to claim 1, wherein
The impeller is arranged so that its center of rotation coincides with the axis of the pump casing,
The horizontal shaft pump, wherein the exhaust section is arranged above the center of rotation of the impeller in the pump casing. A horizontal shaft pump according to claim 2, wherein
The horizontal shaft pump, wherein the exhaust part is arranged above the water level in the internal space when most of the impeller is submerged in the running water in the internal space. In the horizontal shaft pump according to any one of claims 1 to 3,
further comprising a motor casing disposed in the internal space and formed to surround the entire circumference of the motor;
The motor is provided with a shaft rotatable by driving the motor,
The motor is arranged such that the rotation center of the shaft coincides with the axis of the pump casing,
The horizontal shaft pump, wherein the exhaust section is arranged above a water level in the internal space when the motor casing is submerged in flowing water in the internal space to a position corresponding to the center of rotation of the shaft. A horizontal shaft pump according to claim 4,
The horizontal shaft pump, wherein the exhaust section is arranged above a water level in the internal space when most of the motor casing is submerged in running water in the internal space. In the horizontal shaft pump according to any one of claims 1 to 5,
The horizontal shaft pump, wherein the exhaust section is configured by at least one through hole passing through the pump casing. In the horizontal shaft pump according to any one of claims 1 to 5,
The horizontal shaft pump, wherein the exhaust section communicates with the internal space and is configured by a pipe section extending horizontally from an outer peripheral surface of the pump casing. In the horizontal shaft pump according to any one of claims 1 to 5,
The exhaust part
at least one through-hole extending through the pump casing;
a substantially L-shaped elbow member that communicates with the through hole and is fixed to the pump casing. A horizontal shaft pump according to claim 8,
The horizontal shaft pump, wherein one end of the elbow member is fixed to the outer peripheral surface of the pump casing and the other end is open upward. A horizontal shaft pump according to claim 8,
The horizontal shaft pump, wherein one end of the elbow member is fixed to the outer peripheral surface of the pump casing and the other end is open downward.

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