JP6629052B2 - underwater pump - Google Patents

Description

  The present invention relates to a submersible pump, and more particularly, to a submersible pump submerged in a liquid for sucking up liquid such as well water, for example, a submersible pump for deep wells.

  In a submersible pump such as a submersible pump for deep wells, when the pump is stopped, water in a pumping pipe connected to the pump unit may drop at a stretch. The water that has fallen may vigorously penetrate into the pump unit from the discharge port of the pump unit and damage the pump parts. In order to prevent breakage, a check valve having a valve element and a valve element guide is built in the vicinity of the discharge port of the pump section. Japanese Utility Model Application Laid-Open No. 62-117363 discloses a check valve in which a valve moves inside a cylindrical valve guide while being guided by the valve guide.

  Since the deep well submersible pump is often used for pumping drinking water and the like, the material of the liquid contact portion that comes into contact with the liquid is made of corrosion-resistant stainless steel. Further, since relatively small-sized submersible pumps for deep wells have a large number of products sold, press-molded parts are often used for the purpose of suppressing production costs by mass production. Therefore, the valve element and the valve element guide that guides the vertical movement of the valve element are often manufactured by press-molding a stainless steel plate.

  In such a background, at the contact portion between the valve element guide and the valve element, when one of the valve element guide and the valve element has a press punching fracture surface, the other part punches and fractures the one part. Sliding with the edge of the cross section. For this reason, there was a problem that the other of the valve body and the valve body guide was worn and damaged.

  Further, in the case where the valve guide is divided into a plurality of parts in the direction of rotation of the rotating shaft of the submersible pump (that is, in the circumferential direction), there is the following problem. That is, the valve body guide is assembled to the pump casing on its outer periphery, but it is necessary to individually fix each of the plurality of parts to the pump casing by welding or the like. Fixing by welding or the like is costly and is not suitable for the purpose of suppressing production costs by mass production.

62-117363

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a submersible pump in which a contact surface between a valve body and a valve body guide is suppressed from being worn.
Another object of the present invention is to provide a low-priced submersible pump that suppresses pump manufacturing costs.

In order to solve the above problems, in a first embodiment, a valve guide for guiding a valve element of a check valve used in a submersible pump in an axial direction of the submersible pump, wherein the valve element guide includes the valve A plurality of guide portions for guiding the valve body in the axial direction of the submersible pump in contact with a body, and a plurality of mounting portions for mounting the valve body guide to the submersible pump; In a contact portion with the valve body, a cross section of the guide portion perpendicular to the axial direction of the submersible pump projects and curves in a direction toward the valve body, and the plurality of guide portions and the plurality of mounting portions are integrally formed. Has been adopted.

  With such a configuration, the contact part between the valve element guide and the valve element has a curved shape (i.e., a round shape) for the guide part of the check valve (that is, the valve element guide) built in the submersible pump. ). According to the present embodiment, the wear of the valve body due to the vertical movement or the lateral movement of the valve body during the operation of the pump and at the time of starting / stopping the pump is suppressed as compared with the case where the press-punching fracture surface of the valve body guide comes into contact with the valve body. can do.

  Further, since the plurality of guide portions and the plurality of mounting portions are integrated, the valve body guide can be formed as an integral part. In addition, since the cross section of the guide portion perpendicular to the axial direction of the submersible pump projects in the direction toward the valve body and is curved, the curved portion is pushed by a tool or the like in the axial direction of the submersible pump, and the outer shape of the valve body guide is formed. The dimensions can be temporarily reduced. The outer dimensions of the valve guide are made larger than the inner diameter of the pump casing, and when the valve guide is fitted into the casing, the outer dimensions of the valve guide are temporarily reduced, and the valve guide is inserted into the casing. Can be fitted. After the fitting, the valve body guide can be fixed to the casing by the elasticity of the valve body guide.

  That is, by being an integral part and having a curved portion, the valve body guide can be assembled to the casing without using welding or the like. As a result, it is easy to assemble the valve body guide to the pump casing, and as a result, the cost for manufacturing the pump can be reduced, and an inexpensive pump can be provided.

The second embodiment adopts a configuration in which the mounting portions are arranged on both sides of each of the guide portions in the rotation direction of the rotary shaft of the submersible pump.
With such a configuration, one guide portion can be held by two mounting portions from both sides thereof. The two mounting portions are mounted on the casing, and the two mounting portions are securely held by the casing. Since the two mounting portions are securely held, as a result, the guide portion is securely held. Since the guide portion is securely held, the valve body can be securely held at the correct position, and the valve body can be reliably guided during a long-term pump operation.

  In a third mode, the valve body guide has a limiting portion that contacts the valve body to limit the axial movement of the submersible pump of the valve body. In the contact portion, a configuration is adopted in which a cross section of the restriction portion in the rotation direction of the rotary shaft of the submersible pump projects and curves in a direction toward the valve body.

  By adopting such a configuration, the shape of the contact portion between the valve guide and the valve can be curved for the valve guide of the check valve incorporated in the submersible pump. According to the present embodiment, the wear of the valve body due to the vertical movement or the lateral movement of the valve body during the operation of the pump and at the time of starting / stopping the pump is suppressed as compared with the case where the press-punching fracture surface of the valve body guide comes into contact with the valve body. can do.

  In addition, the said valve body guide can employ | adopt the structure which has three or more said guide parts. In addition, the valve body guide may have a configuration including three or more of the restriction portions. In these cases, since the valve element guide and the valve element come into contact with each other at three or more locations, the valve element guide can stably guide the valve element.

In a fourth embodiment, a valve element guide for restricting the axial movement of the submersible pump of a valve element of a check valve used in a submersible pump, wherein the valve element guide is in contact with the valve element A restricting portion for restricting the axial movement of the submersible pump of the valve body, and an attaching portion for attaching the valve body guide to the submersible pump; a contact portion of the restricting portion with the valve body , The cross section of the restriction portion in the rotation direction of the rotary shaft of the submersible pump projects and curves in a direction toward the valve body. According to this embodiment, the same effect as in the third embodiment can be obtained in a valve body guide that is not integrated.

  In the fifth embodiment, a configuration is adopted in which a plurality of the restriction portions and a plurality of attachment portions are provided, and the plurality of restriction portions and the plurality of attachment portions are integrated.

  In a sixth aspect, the valve element guide according to any one of the first to fifth aspects, the valve element used in combination with the valve element guide, an impeller, the valve element guide, and the valve element And an intermediate casing for accommodating the impeller, a suction casing for sucking the liquid, and a pump section having a discharge casing for sending the liquid.

  In the seventh embodiment, a submersible pump including the pump unit according to the sixth embodiment and a motor unit that drives the impeller is employed. In an eighth mode, a submersible pump according to the seventh mode, comprising: a pipe connected to the discharge casing, through which a liquid delivered by the discharge casing flows; and a control unit for controlling the motor unit. It has a configuration called a unit.

It is a whole block diagram of the submersible pump unit for deep wells. It is the whole pump section of the submersible pump for deep wells. FIG. 3 is a diagram showing a partial cross-sectional view of an intermediate casing 114a which is a part of the intermediate casing 114 of FIG. FIG. 4 shows the check valve 126 in the present embodiment, and is an enlarged view of a portion A in FIG. FIG. 5 is a view of the valve body guide 122 shown in FIG. 4 as viewed from above in FIG. FIG. 6 is a perspective view of the valve body 120. FIG. 6 is a perspective view of FIG. 4 as viewed obliquely from above. FIG. 7 is a perspective view of the valve body guide 122 shown in FIGS. FIG. 6 is a six-side view of the valve body guide 122. FIG. 9 is a perspective view of the valve body guide 122 shown in FIG. 8C as viewed obliquely from above in the G direction in FIG. It is a perspective view when the valve body 120 and the valve body guide 122 were assembled. It is a figure showing the curved shape of limiting part 122c. It is a perspective view of valve element 220 of a comparative example. It is the perspective view which looked at the valve element guide 222 of the comparative example from diagonally upward. FIG. 14 is a perspective view of the valve body guide 222 viewed obliquely from below, opposite to FIG. 13. It is a perspective view when the valve element 220 and the valve element guide 222 were assembled.

Hereinafter, a submersible pump according to an embodiment of the present invention will be described with reference to the accompanying drawings, taking a submersible pump for deep wells as an example.
An overall outline of a deep well submersible pump unit according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. The present invention is characterized by the check valve of the submersible pump, and the components of the submersible pump and the components of the submersible pump unit other than the check valve are common to the prior art. In the following description, well water will be described in detail, but the object to be handled is not limited to well water, and can be any kind of liquid.

  A submersible pump unit using a submersible pump for deep wells will be described based on FIG. FIG. 1 is a diagram illustrating a case where the deep well submersible pump 107 is installed in a well, in which the ground is represented as a cross section. Well water 103 exists at a predetermined water level in the well. In the well water 103, a deep well submersible pump 107 is installed so as to be entirely submerged. The submersible pump 107 for a deep well has a submersible motor (motor unit) 101 attached to the lower part, and a pump body (pump unit) 102 attached to the upper side of the submersible motor 101. A suction casing 108 for sucking the well water 103 is provided on the underwater motor 101 side. On the opposite side of the suction casing 108, a discharge casing 109 for supplying well water pressurized by an impeller (not shown) is provided.

  A discharge pipe 104 is connected to the discharge casing 109, and the discharge pipe 104 through which the water discharged from the discharge casing 109 flows extends to the ground. A predetermined control device (control unit) 105 is provided in the middle of the discharge pipe 104 on the ground. The control device 105 is provided with a pressure tank branched from the discharge pipe 104, a pressure sensor for detecting the pressure in the discharge pipe 104, and a control unit (all not shown) for controlling start and stop of water supply. A terminal 106 is provided downstream of the control device 105, and well water is drained from the terminal 106.

  Next, a detailed configuration of the pump body 102 will be described with reference to FIG. The lower part of the suction casing 108 is a suction port 110. On the other hand, the upper end of the discharge casing 109 is a discharge port 111. Between the suction casing 108 and the discharge casing 109, an intermediate casing 114 and an upper casing 116 are provided in this order from below, and a belt-shaped tightening band 124 is further provided outside the intermediate casing 114 and the upper casing 116. In the case of this drawing, there are eight intermediate casings 114 (eight stages) as shown.

  The suction casing 108 will be described. The suction casing 108 is provided at a lower end of the pump body 102 and is connected to the underwater motor 101. A suction port 110 is formed in the suction casing 108, and water is sucked through the suction port 110.

  The inside of the intermediate casing 114 is shown in FIG. FIG. 3 is a partial cross-sectional view of the intermediate casing 114a which is a part of the intermediate casing 114 of FIG. In FIG. 3, the left side of the center axis L of the pump shows the outer surface of the pump, and the right side of the center axis L shows the inside of the pump. An impeller 113 and a diffuser 117 are arranged inside the intermediate casing 114, and the impeller 113 is fixed to a pump shaft 112 that transmits a driving force of the submersible motor 101. For this reason, the impeller 113 rotates with the rotation of the pump shaft 112. The example of FIG. 2 is a multi-stage pump, and a plurality of sets (eight sets) of the impeller 113 and the diffuser 117 are provided. The pump shaft 112 is rotatably supported by a bearing (not shown) installed in the intermediate casing 114.

  The intermediate casing 114 accommodates the impeller 113 and the diffuser 117 and pressurizes well water. In other words, the impeller 113 rotates along with the rotation of the pump shaft 112, thereby imparting radial energy outward velocity energy to the well water. The well water to which the velocity energy has been given is pressurized by the diffuser 117 and supplied to the impeller 113 at the next stage. The intermediate casing 114, together with the impeller 113 and the diffuser 117, forms a pressurized passage for well water. Note that the pump body 102 according to the present embodiment is a multi-stage pump, and a plurality of sets of the impeller 113 and the diffuser 117 are provided. Since one intermediate casing 114 of the present embodiment is provided for each pair of the impeller 113 and the diffuser 117, a number of intermediate casings 114 corresponding to the number of stages are connected side by side along the central axis L. I have.

  The suction casing 108 and the discharge casing 109 are fastened by a fastening band 124. Further, inside the upper casing 116, a valve body 120 of a check valve, a check valve seat 121 in contact with the valve body 120, and a valve body guide 122 are provided. In the deep well submersible pump after the operation is stopped, the weight of the well water in the discharge pipe 104 is applied from above the valve body 120, and the check valve is closed. This prevents well water from flowing back downward from the valve body 120. On the other hand, when the operation of the deep well submersible pump is resumed, the well water pressurized by the impeller 113 presses the valve body 120 from below, so that the check valve is opened.

  Before describing the structure of the check valve in the present embodiment, the structure of the check valve 226 of the comparative example will be described with reference to FIGS. In the comparative example, the valve element guide has a press punching fracture surface, and the valve element slides with the edge of the punching fracture surface of the valve element guide. For this reason, there was a problem that the valve body was worn and damaged.

  FIG. 12 is a perspective view showing a valve body 220 of the comparative example. The valve body 220 is a metal member, and floats from the check valve seat 121 by being pressed from below to allow well water and air to flow upward. FIG. 13 is a perspective view of the valve body guide 222 of the comparative example viewed obliquely from above. FIG. 14 is a perspective view of the valve body guide 222 viewed obliquely from below, opposite to FIG. That is, FIG. 14 shows the lower surface of the valve body guide 222. Further, FIG. 15 shows a perspective view when the valve element 220 and the valve element guide 222 are assembled. FIG. 15 is a perspective view of the valve body guide 222 as viewed obliquely from above. That is, FIG. 15 shows the upper surface when the valve element 220 and the valve element guide 222 are assembled.

  The valve body guide 222 will be described with reference to FIGS. The valve body guide 222 guides the valve body 220 of the check valve in the axial direction of the shaft 112 of the submersible pump. To this end, the valve body guide 222 includes a plurality of (six) guide portions 222a that contact the valve body 220 and guide the valve body 220 in the axial direction L of the shaft 112 of the submersible pump, and the valve body guide 222 includes And a plurality of (three) mounting portions 222b for mounting the mounting portions 222b. The portion of the guide portion 222a in contact with the valve body 220 is a punched-out cross section of the valve body guide 220. The valve element 220 slides on the edge of the cut-out section of the valve element guide 222 and is worn.

  The valve body guide 222 has six restricting portions 222c that contact the valve body 220 and restrict the axial movement of the submersible pump of the valve body 220. The contact portion of the restricting portion 222c with the valve body 220 is a punch-out section of the valve body guide 220. The valve element 220 slides on the edge of the punched-out section of the valve element guide 222 and is worn.

  Next, FIGS. 4 and 5 show the check valve 126 in the present embodiment. FIG. 4 is an enlarged view of a portion A in FIG. FIG. 5 is a view of the valve body guide 122 shown in FIG. 4 as viewed from above in FIG. FIG. 4 is an AOA sectional view of FIG. Inside the upper casing 116, a valve body 120 and a check valve seat 121 abutting on the valve body 120 are provided. The valve element 120 has a substantially circular planar shape, and has a trapezoidal central portion and a substantially L-shaped outer peripheral portion in longitudinal section. A circular dotted line 120a in FIG. 5 indicates an outer peripheral portion of the valve body 120 when the valve body 120 and the valve body guide 122 are combined. In addition, in FIG. 4, the valve body guide 122 is shown by hatching.

The check valve 126 is fixed to the upper casing 116 by the elastic force of the valve body guide 122 itself as described later. On the other hand, the check valve seat 121 is a ring-shaped member having a substantially S-shaped cross section. The outermost peripheral portion of the check valve seat 121 is fitted to the inner surface of the upper casing 116, and the check valve seat 121 is supported by the upper casing 116. The movement of the valve body 120 is restricted in the vertical and horizontal directions by the valve body guide 122 and the check valve seat 121. That is, the upward and lateral movements of the valve element 120 are restricted by the valve element guide 122, and the downward and lateral movements of the valve element 120 are restricted by the check valve seat 121. Here, the lateral direction is a direction perpendicular to the axial direction of the rotation axis of the pump.

  FIG. 6 is a perspective view of the valve body 120. FIG. 6 is a perspective view of FIG. 4 as viewed obliquely from above. The valve body 120 is made of a metal member or a metal member coated with rubber, and floats from the check valve seat 121 by pressing from below to allow well water or air to flow upward. . The valve element 120 shown in FIG. 6 is formed by covering a metal member with rubber.

  FIG. 7 is a perspective view of the valve body guide 122 shown in FIGS. FIG. 8 shows six views of the valve body guide 122. FIG. 8A is the same as FIG. 5 and shows the valve body guide 122 shown in FIG. 4 as viewed from above in FIG. FIG. 8C is a view of the valve body guide 122 shown in FIG. 4 as viewed from below in FIG. 8 (b), 8 (d), 8 (e) and 8 (f) respectively show the valve body guide 122 shown in FIG. 8 (c) and B, D and E in FIG. 8 (c). , F. FIG. FIG. 8G is a perspective view of the valve body guide 122 shown in FIG. 8C as viewed obliquely from above in the G direction in FIG. 8C. That is, FIG. 8G shows the lower surface of the valve body guide 122.

  FIG. 7 is a perspective view of the valve body guide 122 shown in FIG. 8A as viewed obliquely from above in the H direction in FIG. 8A. That is, FIG. 7 shows the upper surface of the valve body guide 122. FIG. 9 is a perspective view of the valve body guide 122 shown in FIG. 8C as viewed obliquely from above in the G direction in FIG. 8C, as in FIG. 8G. It is the figure seen from the even higher position. That is, FIG. 9 shows the lower surface of the valve body guide 122.

  Further, FIG. 10 shows a perspective view when the valve body 120 and the valve body guide 122 are assembled. FIG. 10 is a perspective view of the valve body guide 122 shown in FIG. 8A as viewed obliquely from above in the direction H in FIG. 8A. That is, FIG. 10 shows the upper surface when the valve body 120 and the valve body guide 122 are assembled.

  The valve body guide 122 will be described with reference to FIGS. The valve guide 122 guides the valve 120 of the check valve 126 used in the submersible pump in the axial direction of the shaft 112 of the submersible pump. For this purpose, the valve body guide 122 includes a plurality of (three) guide portions 122a that come into contact with the valve body 120 and guide the valve body 120 in the axial direction of the shaft 112 of the submersible pump, and the valve body guide 122 for the submersible pump. And a plurality of (six) attachment portions 122b for attachment.

  At the contact portion of the guide portion 122a with the valve body 120, the cross section of the guide portion 122a perpendicular to the axial direction of the submersible pump projects and curves in the direction toward the valve body 120. The plurality of guide portions 122a and the plurality of mounting portions 122b are integrated. In the rotation direction of the rotary shaft 112 of the submersible pump, mounting portions 122b are arranged on both sides of each of the guide portions 122a.

  Since the cross section of the guide portion 122a perpendicular to the axial direction of the submersible pump protrudes in the direction toward the valve body 120 and is curved, the curved portion is pushed in the axial direction of the submersible pump by a tool or the like, and the valve body guide 122a is pressed. Can be temporarily reduced. The outer dimension L1 of the valve guide 122 is made larger than the inner diameter of the pump casing 116, and when the valve guide 122 is fitted into the casing 116, the outer dimension L1 of the valve guide 122 is temporarily reduced. The valve body guide 122 can be fitted into the casing 116. After the fitting, the valve body guide can be fixed to the casing 116 by the elasticity of the valve body guide 122.

That is, by being an integral part and having a curved portion, the valve body guide 122 can be assembled to the casing 116 without using welding or the like. As a result, assembling of the valve body guide 122 to the pump casing 116 is facilitated, and as a result, the pump manufacturing cost is suppressed, and an inexpensive pump can be provided. The outer dimension L1 shown in FIG. 5 indicates a length from the axis O of the rotary shaft 112 of the pump to the outer periphery of the valve body guide 122.

  The valve body guide 122 has six restricting portions 122c that contact the valve body 120 and restrict the axial movement of the submersible pump of the valve body 120. At a contact portion of the restricting portion 122c with the valve body 120, a cross section of the restricting portion 122c in the rotation direction of the rotary shaft 112 of the submersible pump projects and curves in a direction toward the valve body 120. FIG. 11 is an enlarged view of a contact portion 122d of the restricting portion 122c with the valve body 120. FIG. 11 is a cross-sectional view of the restricting portion 122c in the rotation direction of the rotary shaft 112 of the submersible pump. This sectional view is also a sectional view of the restricting portion 122c in a direction parallel to the axial direction of the rotary shaft 112 of the submersible pump.

  FIG. 11A is a cross-sectional view taken along a line II of FIG. In FIG. 11A, the limiting portion 122c forms a curved portion 122d in a part of the limiting portion 122c by bending a stainless steel plate. The curved portion 122d is the contact portion 122d. FIG. 11B shows the shape of the limiting portion 122c in another embodiment. In FIG. 11B, a bending portion 122d is formed in a part of the restriction portion 122c by bending a stainless steel plate, and the bending portion 122d is a contact portion 122d.

  The distance H1 between the top of the guide portion 122a and the top of the curved portion 122d in FIG. 8E is the movable range of the valve body 120 in the pump axis direction. That is, the distance H1 is determined based on how much the valve body 120 needs to be moved in the pump axial direction. As shown in FIG. 8E, the top 122e of the mounting portion 122b is lower than the top 122f of the guide 122a. The reasons are cost savings due to material savings and weight savings.

  The valve body guide 122 can be manufactured as follows. The valve body guide 122 is manufactured from a thin and long plate material of stainless steel. The thickness of the plate material is the same as the thickness T1 shown in FIG. 8A, and the width of the plate material is the same as the height H2 shown in FIG. 8F. One flat plate having a developed shape of the guide portion 122a, the mounting portion 122b, and the restriction portion 122c is formed from the plate material by press punching. A flat plate is bent and bent, and both ends in the longitudinal direction of the plate are welded to each other. Finally, a bending or bending process is performed to form the restriction portion 122c.

  Although the above-described valve element guide is integrated, the valve element guide may not be integrated, that is, the valve element guide without the portion 122g in FIG. 8A may be used. At this time, the valve element guide that restricts the axial movement of the submersible pump of the valve element 120 includes a restricting portion 122c that contacts the valve element 120 and restricts the axial movement of the valve element in the submersible pump; And a mounting portion 122b for mounting the body guide to the submersible pump. At the contact part 122d of the restriction part 122c with the valve body 120, the cross section of the restriction part 122c in the rotation direction of the rotation shaft of the submersible pump projects and curves in the direction toward the valve body. By using three or more valve body guides, the movement of the valve body 120 can be restricted. Further, the valve body guide can guide the valve body 120 in the axial direction by the guide portion 122a having the above-described shape. Also in this valve body guide, since the contact portion with the valve body 120 is curved, there is an advantage that the wear of the valve body 120 can be reduced. When not integrated, when attaching the valve body guide to the casing, a method such as welding is required.

DESCRIPTION OF SYMBOLS 101 Submersible motor 102 Pump main body 107 Submersible pump for deep wells 120 Valve body 122 Valve body guide 122a Guide part 122b Mounting part 122c Restriction part 126 Check valve

Claims (8)

A valve guide for guiding the valve element of the check valve used in the submersible pump in the axial direction of the submersible pump, wherein the valve element guide is
A plurality of guide portions that contact the valve body and guide the valve body in the axial direction of the submersible pump,
A plurality of mounting portions for mounting the valve body guide to the submersible pump,
In a contact portion of the guide portion with the valve body, a cross section of the guide portion perpendicular to the axial direction of the submersible pump projects and curves in a direction toward the valve body,
A valve body guide in which the plurality of guide portions and the plurality of mounting portions are integrated.   The valve body guide according to claim 1, wherein the mounting portions are arranged on both sides of each of the guide portions in a rotation direction of a rotation shaft of the submersible pump. The valve body guide is
The valve element has a restricting portion that restricts axial movement of the submersible pump in contact with the valve element,
3. The section according to claim 1, wherein a cross section of the restricting portion in a rotation direction of a rotating shaft of the submersible pump projects and curves in a direction toward the valve body at a contact portion of the restricting portion with the valve body. Valve body guide. A valve guide of a check valve used in a submersible pump, which restricts axial movement of the submersible pump, wherein the valve guide is
A restrictor that contacts the valve body and restricts axial movement of the submersible pump of the valve body,
A mounting portion for mounting the valve body guide to the submersible pump,
A valve guide wherein a cross section of the restriction in a rotation direction of a rotation shaft of the submersible pump protrudes in a direction toward the valve at a contact portion of the restriction with the valve. Having a plurality of the limiting portions and a plurality of mounting portions,
The valve body guide according to claim 4, wherein the plurality of restriction portions and the plurality of attachment portions are integrated. A valve body guide according to any one of claims 1 to 5,
The valve element used in combination with the valve element guide,
An impeller,
An intermediate casing that houses the valve body guide, the valve body, and the impeller;
A suction casing for sucking liquid;
A pump unit having a discharge casing for delivering a liquid; A pump unit according to claim 6,
A submersible pump having a motor unit for driving the impeller. A submersible pump according to claim 7,
A pipe connected to the discharge casing, through which liquid discharged by the discharge casing flows;
A submersible pump unit having a control unit for controlling the motor unit.

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