WO2008023515A1

WO2008023515A1 - Self-suction pump

Info

Publication number: WO2008023515A1
Application number: PCT/JP2007/064256
Authority: WO
Inventors: Yasumasa Kurihara
Original assignee: Iwaki Co., Ltd.
Priority date: 2006-08-23
Filing date: 2007-07-19
Publication date: 2008-02-28
Also published as: TW200829797A; JP2008050958A

Abstract

A self-suction pump capable of stably discharging fluid to be transferred even if the fluid becomes a mixture of gas and liquid. A liner ring (50), which is in rubbing contact with an impeller (29) when it moves to the front side during its rotation, is provided at a circular plate section (26b), at a position on the rear side of its innermost step. In a cover member (37) of the impeller (29) provided at a position facing a front partition wall (26), a center portion (37a) of a circular plate has an opening having substantially the same size as an opening of the circular tube section (26a) of the front partition wall (26). The edge (37a) of the opening of the circular plate is formed in a ring shape so as to project to the front partition wall (26) side. A backflow prevention projection (37a) is inserted inside the liner ring (50) of the front partition wall (26) with a predetermined gap provided between the projection (37a) and the liner ring (50). A mouth ring (51), which comes into rubbing contact with the liner ring (50) when the impeller (29) moves to the front side, is provided on the cover member (37), at a position facing the liner (50).

Description

Specification

Self-priming pump

Technical field

The present invention relates to a self-priming pump that includes a tank chamber that stores priming water and that has an impeller that is rotationally driven in the tank chamber.

Background art

[0002] Conventionally, a self-priming pump that transfers a transfer fluid to a predetermined place by sucking the transfer fluid from the suction port and discharging it to the discharge port has been known. In such a self-priming pump, priming water is introduced into the tank chamber at the start of operation, and by rotating the impeller disposed in the tank chamber, the gas remaining in the tank is discharged from the discharge port together with the priming water, A self-priming operation is performed in which only the transfer fluid is filled in the tank.

[0003] As this type of self-priming pump, for example, the one described in Patent Document 1 is known. This self-priming pump has an inner diameter of a mouth part of a partition plate that partitions the first casing and the second casing made of synthetic resin, and an outer diameter of an impeller (impeller) into which the tip is inserted. It is intended to improve pumping performance and pump efficiency by reducing the gap and restricting the transfer fluid that flows backward from the pump chamber to the suction side through the gap.

Patent Document 1: JP 2005-48675

Disclosure of the invention

Problems to be solved by the invention

[0004] However, the above-described self-priming pump has a drawback in that it is difficult to manage the inner diameter of the mouse portion and the outer diameter of the impeller.

[0005] The present invention has been made in view of these points, and an object of the present invention is to provide a self-priming pump capable of improving the efficiency of the pump by restricting the backflow of the fluid transferred to the suction side. Means to solve the problem

[0006] A self-priming pump according to the present invention includes a casing having a suction port and a discharge port for a transfer fluid, and the inside of the casing is partitioned to form a pump chamber and communicate with the suction port. A front partition that forms an inlet on the front side of the pump chamber, and is rotatably accommodated coaxially with the inlet in the pump chamber, and the transfer fluid is placed in a portion facing the inlet of the front partition. An impeller that is formed with an opening for introduction and discharges the transfer fluid introduced from the opening from the outer periphery, a support member that supports the impeller rotatably and slidably in the direction of the rotation axis, and the impeller A rotational drive means for rotationally driving, and at least one of the inlet of the front partition and the opening of the impeller, projecting in a direction parallel to the rotation axis, and the inlet of the front partition and the opening of the impeller; And a backflow-preventing protrusion that covers at least one of the inner and outer peripheral side gaps in the direction of the rotation axis between them.

The invention's effect

[0007] According to the previous invention, when the impeller held rotatably and slidable on the support member rotates and starts the self-priming operation, no axial thrust is generated in the impeller during the initial suction operation. For this reason, an annular gap is formed between the inlet of the front partition and the opening of the impeller, and the liquid in the pump chamber attempts to flow back to the inlet side where the degree of vacuum is increased through this gap. However, since at least one of the inlet of the front partition wall and the opening of the impeller is formed with a backflow preventing protrusion that covers the annular gap from at least one of the inner peripheral side and the outer peripheral side in a non-contact manner. However, the labyrinth structure is applied to the fluid that flows backward, limiting the backflow. As a result, the pump can be started quickly by preventing a reduction in the degree of vacuum on the inlet side. After the pump is started, axial thrust is generated in the impeller, and the annular gap between the front partition inlet and the impeller opening is closed, and backflow of fluid in this portion is prevented. As a result, the pump efficiency can be maximized.

Brief Description of Drawings

FIG. 1 is a cross-sectional view of a self-priming pump according to a first embodiment.

FIG. 2 is an enlarged cross-sectional view of FIG.

FIG. 3 is an enlarged cross-sectional view of a self-priming pump according to a second embodiment.

FIG. 4 is an enlarged sectional view of a self-priming pump according to a third embodiment.

FIG. 5 is an enlarged cross-sectional view of a self-priming pump according to a fourth embodiment. FIG. 6 is an enlarged cross-sectional view of a self-priming pump according to a fifth embodiment.

Explanation of symbols

[0009] 1 ... Casing

2. Pump body

3 ... 1st casing 4 ... 2nd casing

5 ··· Partition plate

9- 1st pump chamber

20 ··· Second pump chamber

29 ... Impeller

50..Liner ring

51..Mouse ring

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0011] (First embodiment)

FIG. 1 is a cross-sectional view showing the overall configuration of the self-priming pump according to the first embodiment of the present invention. The self-priming magnet pump includes a casing 1 and a pump body 2 mounted on the rear side of the casing 1. Hereinafter, the self-priming magnet pump is simply referred to as “pump”.

The casing 1 is partitioned by a partition wall 5 into a first casing 3 on the front side and a second casing 4 on the rear side. A suction port 3a projects from the front end of the first casing 3 toward the front side. A flange 6 is provided at the tip of the suction port 3a. The suction port 3a extends vertically from the lower part of the pump to the upper part of the first casing 3, and has a tip end of the suction pipe 7 bent at approximately 90 degrees toward the suction port 3a at the height of the suction port 3a. It is connected. A flange 7a is formed at the tip of the suction pipe 7, and the flange 7a of the suction pipe 7 and the flange 6 of the suction pipe 3a are fastened by screws or the like not shown through an O-ring 8. ing. On the upper surface of the first casing 3, a liquid supply hole 3 b for introducing a liquid as priming water into the first tank chamber 9 is formed. The liquid supply hole 3b is fitted with a valve 11 via an O-ring 10. The hole 3b can be opened and closed.

[0013] The first tank chamber 9 has three chambers extending in the vertical direction in a direction orthogonal to the drawing sheet, and only the middle suction chamber 9A is shown in the drawing. The chambers on both sides (not shown) communicate with each other via a communication chamber 9B defined by the upper partition plate 12, and communicate with the suction chamber 9A at the upper end. As a result, the liquid used as priming water is accumulated in the three chambers, ensuring a sufficient amount necessary for starting the pump, and the movement of the liquid in the suction chamber 9B becomes dominant during the pump operation. The upper partition plate 12 is formed with a hole 12 a penetrating in the vertical direction at a position in contact with the partition plate 5. As a result, the upper suction chamber 9A and the chambers on both sides thereof communicate with each other even at the end. A lower tank chamber 9C is provided below the connection chamber 9B via a lower partition plate 13. In addition, a drainage port 3c that protrudes to the outside is formed at a position in contact with the bottom surface of the lower tank chamber 9C. By opening the valve 14 fitted to the drainage port 3c, the drainage port 3c force, Can be drained.

[0014] The partition plate 5 that partitions the first casing 3 and the second casing 4 has an upper partition plate at the lower end.

A circular suction hole 5a in contact with 12 is provided. At the lower side of the suction hole 5a of the partition plate 5, there is formed a hole 5b for connecting the lower tank chamber 9C and the second casing 4 near the bottom. As a result, when the drain port 3c provided in the lower tank chamber 9C is opened, the transfer fluid accumulated near the bottom surface in the second casing 4 can be discharged through the drain hole 3c.

The second casing 4 is configured to include a second tank chamber 20 that accommodates a transfer fluid and a part of the pump body 2 therein. The internal space of the second tank chamber 20 is divided into a lower tank chamber 20B that generates a vortex by the partition plate 21 and the like, and a discharge chamber 20A that communicates with the lower tank chamber 20B!

[0016] A projecting port 4a projecting upward is formed at the upper end of the second casing 4, and a flange 22 is provided at the tip of the outlet 4a. The discharge port 4a is connected to the rear end portion of the discharge pipe 23 extending upward from the upper end of the pump. A flange 23a is formed at the rear end of the discharge pipe 23. The flange 23a of the discharge pipe 23 and the flange 22 of the discharge port 4a are connected to each other with screws or the like (not shown) via an O-ring 24. It is connected by.

[0017] Below the second casing 4, an opening 4b is formed on the side surface on the rear side, and the opening 4b The pump chamber portion of the pump body 2 is installed in the lower tank chamber 20B.

FIG. 2 is an enlarged cross-sectional view of the pump body 2 in FIG. The pump body 2 includes a front partition wall 26 that divides the interior of the second casing 4 and forms a pump chamber 28 therein, and a cylindrical space that communicates with the pump chamber 28 and projects from the rear side opening 4b to the rear side. A bottomed cylindrical rear partition wall 27 made of a non-magnetic material such as a resin, a support shaft 39 protruding from the rear bottom surface of the rear partition wall 27 to the front side, and a cylindrical shape on the support shaft 39 A cylindrical driven rotor 30 that is coaxially supported so as to be rotatable and slidable via a bearing 40, and is coaxially and integrally mounted on the front side of the driven rotor 30 and rotates in the pump chamber 28. An impeller 29, a drive rotator 33 that is magnetically coupled to the driven rotator 30 via the rear partition wall 27 and rotationally drives the driven rotator 30, a motor 34 that rotationally drives the drive rotator 33, and a drive rotator 33 A cylindrical drive body casing 31 covering the outside of the Is constructed! /,

[0019] The front partition wall 26 is connected to a suction hole 5a formed on the partition plate 5 on the front side, and a cylindrical portion 26a whose base end side is an introduction port 26c for the fluid to be transferred to the pump chamber 28, and a base of the cylindrical portion 26a And a disk portion 26b that expands from the end side and forms the front side wall portion of the pump chamber 28. A liner ring 50 is attached to the inlet 26c of the front partition wall 26. Holes 26d and 26e for communicating the lower tank chamber 20B of the second casing 4 and the pump chamber 28 are formed below the disc portion 26b of the front partition wall 26. The disc part 26b of the front partition wall 26 is fitted with a ring-shaped partition wall 4d protruding toward the inside of the second casing 4 along the opening 4b formed on the rear side surface of the second casing 4. In combination, a pump chamber 28 is formed. A step 4c is formed at the edge of the opening 4b of the second casing 4, and the rear edge 27a of the rear partition 27 is fitted to the step 4c via an O-ring 25, thereby providing a rear partition. The inside of 27 is sealed.

[0020] The driven rotator 30 includes a cylindrical rotator 30a and a driven magnet 41 embedded on the outer peripheral side of the cylindrical rotator 30a. An impeller 29 is attached to the front end of the driven rotor 30. The impeller 29 includes a circular plate 35, a plurality of blades 36 formed on the front side of the circular plate 35, and an annular cover joined so as to sandwich the plurality of blades 36 in pairs with the circular plate 35. Member 37. In the center of the cover member 37 there is an opening 3 7a is formed, and a mouth ring 51 is attached to the periphery of the opening 37a so as to face the liner ring 50 of the front partition wall 26.

On the other hand, on the base end side of the central axis of the disc 35, a thrust bearing 38 that is in pinpoint contact with the distal end portion of the support shaft 39 is provided! A predetermined annular gap is formed between the liner ring 50 and the mouth ring 51 in a state where the thrust bearing 38 is in contact with the front end surface of the support shaft 39. As a result, when the impeller 29 moves to the front side along the support shaft 39, the mouse ring 51 comes into sliding contact with the liner ring 50, and when the impeller 29 moves to the rear side along the support shaft, The thrust bearing 38 comes into pinpoint contact with the tip surface of the support shaft 39. The opening 37a of the impeller 29 is formed with a ring-shaped backflow prevention protrusion 37b that protrudes to the front side and covers the annular gap between the liner ring 50 and the mouth ring 51 from the inner peripheral side without contact. Yes.

The drive rotator 33 includes a cylindrical rotator 33a and a drive magnet 42 embedded on the inner peripheral side thereof. A rotating shaft of the motor 34 is fixed to the rear side surface of the driving rotating body 33. The drive magnet 42 is magnetically coupled to the driven magnet 41 via the rear partition wall 27 and rotationally drives the driven magnet 41 by the rotational driving force from the motor 34.

Next, the operation of the pump configured as described above will be described.

[0024] First, prior to the self-priming operation, a transfer fluid serving as priming water is introduced from the liquid supply hole 3b of the first casing 3, and the suction fluid 7, the first casing 3, and the second casing 4 are filled with the transfer fluid. . At this time, the liquid level of the transfer fluid in the first casing 3 is equal to the height of the lowest point of the suction port 3a and is filled with gas.

Next, when the drive rotator 33 is rotationally driven by the motor 34, the impeller 29 is rotationally driven via the driven rotator 30 and the self-priming operation is started. As a result, the transfer fluid and residual gas in the first tank chamber 9 are sucked into the opening 37a of the impeller 29 and discharged from the outer peripheral side of the impeller 29 by the centrifugal force of the impeller 29, whereby the second tank chamber 20 Transferred to

The transfer fluid and gas thus transferred from the first tank chamber 9 to the second tank chamber 20 repeat gas-liquid separation on the liquid surface of the second tank chamber 20, and the separated gas is discharged from the discharge port. It is discharged from 4a to the discharge side. During the initial suction operation when the self-priming operation is started, the impeller Since no directional force or radial thrust is generated on the front side of 29, but on the contrary, directional force or axial thrust is generated on the rear side, the impeller 29 moves back to the position where the thrust bearing 38 contacts the tip surface of the support shaft 38. The largest annular gap is formed between the inlet of the front partition and the opening of the impeller. As a result, the liquid containing some bubbles in the pump chamber 28 tries to flow back to the inlet 26c side where the degree of vacuum is increased through the annular gap.

[0027] However, since a backflow preventing projection 37b is formed at the tip of the impeller 29 so as to cover the annular gap from the inner peripheral side in a non-contact manner, the projection 37b is free from labyrinth against the fluid to flow back. As a result, the backflow is limited.

[0028] Thereby, a rapid pump start is realized by preventing a decrease in the degree of vacuum on the inlet 26c side. After the pump is started, the impeller 29 generates a forward thrust and a reverse axial thrust, the impeller 29 slides forward, and the liner ring 50 and the mouth ring 51 come into contact with each other. The annular gap between them is closed. Therefore, the back flow of the fluid in this part is prevented. As a result, the pump efficiency can be maximized.

[0029] Table 1 shows the self-priming operation time of the conventional pump and the pump according to the first embodiment of the present invention when the suction height is 4 m. Thus, compared to the conventional pump, the pump according to the first embodiment of the present invention has a labyrinth structure, so that it is 13.40% in the first test, and 20.45% in the second and third tests. The suction operation time has been shortened.

[0030] [Table 1]

[0031] (Second Embodiment)

FIG. 3 is an enlarged sectional view of the self-priming pump according to the second embodiment of the present invention. Since the configuration other than the shape of the impeller is the same as that of the first embodiment, description thereof is omitted.

In the first embodiment, the annular gap between the front partition wall 26 and the impeller 29 is covered from the inner peripheral side. Only the backflow prevention projection 37b is formed, but in the second embodiment, the backflow prevention projection 37Ab that covers the annular gap from the inner peripheral side and the backflow prevention valve 37Ac that covers the outer peripheral side are provided. It is provided on the impeller 29 side.

[0033] A ring-shaped first backflow prevention protrusion 37Ab protruding toward the front partition wall 26 is formed at the edge of the opening 37Aa of the cover member 37A of the impeller 29A. A ring-shaped backflow prevention protrusion 29Ab protruding toward the front partition wall 26 is formed through the mouth ring 51 lowered to the front. That is, the backflow prevention protrusions 29Ab and 29Ac are formed in a double manner through the mouth ring 51. In the gap between the first backflow prevention projection 29Aa and the second backflow prevention projection 29Ab, a liner ring 50 protruding from the mating front partition wall 26 is disposed via a predetermined gap. The annular clearance between the backflow preventing protrusions 29Ab and 29Ac and the liner ring 50 is formed in a multi-stage crank shape.

[0034] In this way, by forming the double backflow prevention protrusion on the impeller 29A side, the labyrinth structure of the gap between the front partition wall 26 and the impeller 29A can be further complicated, The backflow of the gas impeller 29A staying in the annular gap to the suction side can be more effectively prevented.

(Third embodiment)

FIG. 4 is an enlarged cross-sectional view of a self-priming pump according to the third embodiment of the present invention. In addition, since it is the same structure as 1st Embodiment except the shape of a front partition and an impeller, the description is abbreviate | omitted.

[0035] In the third embodiment, the backflow prevention protrusion that is integrally formed on the impeller 29 side in the first embodiment is arranged on the front partition wall 26B side.

[0036] The front partition wall 26B includes a cylindrical portion 26Ba and a multi-stage disk portion 26Bb that is connected to the opening end and has a diameter that increases toward the rear side. On the inner diameter of the disc portion 26Bb, a ring-shaped backflow preventing projection 26Bc protruding to the rear side is formed. The backflow prevention protrusion 26Bc is arranged so as to be inserted into the inner peripheral side of the mouth ring 51 provided on the other impeller 29B through a predetermined gap. The impeller 29B is provided with a backflow prevention protrusion.

[0037] As described above, even if the backflow prevention protrusion 26Bc is provided on the front partition wall 26B side, A light effect can be obtained.

(Fourth embodiment)

FIG. 5 is an enlarged cross-sectional view of a self-priming pump according to the fourth embodiment of the present invention. In the third embodiment, the force in which only the backflow prevention projection 26Bc that covers the annular gap between the front partition wall 26B and the impeller 29B from the inner peripheral side is formed is formed in the front partition wall 29C in the fourth embodiment. A backflow prevention projection 26Cc covering the inner periphery of the annular gap between the front partition wall 26B and the impeller 29B and a backflow prevention projection 29Cd covering the outer periphery are provided.

[0038] The front partition wall 26C includes a cylindrical portion 26Ca and a multi-stage disk portion 26Cb that is connected to the opening end and has a diameter that increases toward the rear side. A ring-shaped first backflow prevention protrusion 26Cc protruding to the rear side is formed on the inner diameter of the disk part 26Cb, and a liner ring 50 is interposed on the outer periphery of the first backflow prevention protrusion 26Cc. A ring-shaped second backflow prevention protrusion 26Cd is formed to protrude rearward. Between the first backflow prevention projection 26Cc and the second backflow prevention projection 26Cd protruding to the rear side, a mouth ring 50 protruding from the other impeller 29 is interposed. Therefore, a multi-stage labyrinth structure is formed between the first backflow prevention protrusion 26Cc, the second backflow prevention protrusion 26Cd, and the mouth ring 50.

[0039] As described above, the effect of the present invention can be achieved even if a plurality of backflow preventing protrusions are provided on the front partition wall side.

(Fifth embodiment)

FIG. 6 is an enlarged cross-sectional view of a self-priming pump according to a fifth embodiment of the present invention. Since the configuration is the same as that of the first embodiment except for the shape of the front partition wall, description thereof is omitted.

[0040] In the first embodiment, the backflow prevention protrusion 29b is formed on the impeller 29 side, but in the fifth embodiment, in addition to the backflow prevention protrusion 29a provided on the impeller 29 side, Further, a backflow preventing projection 26Dc is formed on the front partition wall 26D side. Since the configuration of the impeller 29 is the same as that of the first embodiment, the description thereof is omitted.

[0041] The front partition wall 26D includes a cylindrical portion 26Da and a plurality of stages of disk portions 26Db connected to the rear side of the cylindrical portion 26Da. A liner ring 50 is provided on the inner diameter of the disk portion 26Db. On the outer periphery of the liner ring 50, a ring-shaped backflow prevention protrusion 26Dc protruding to the rear side is formed. Thus, even if the back flow preventing protrusions are provided on both sides of the front partition wall 26D and the impeller 29, the effect of the present invention can be obtained.

[0042] The number of backflow prevention protrusions provided in the above embodiment is not limited to one or two, but any number of backflow prevention protrusions may be provided on the front partition wall side or impeller side. It can be formed in at least one.

[0043] Further, the backflow preventing protrusion may be configured to be attached with another member that is not necessarily formed integrally with the front partition wall and the impeller. Further, the shape of the backflow prevention protrusion is not necessarily required to be formed in a ring shape, so long as it forms a labyrinth structure in the annular gap between the front partition wall and the impeller. Also good.

Further, in the above embodiment, a pump having a structure in which the driven rotator 30 rotates with respect to the support shaft 39 is applied to the pump having a rotating shaft that integrally rotates with the force driven rotator to which the present invention is applied. Is also applicable.

Claims

The scope of the claims

[1] a casing having a suction port and a discharge port for the transfer fluid;

A front partition wall that forms a pump chamber by partitioning the inside of the casing and that forms an introduction port communicating with the suction port on the front side of the pump chamber;

The pump chamber is rotatably accommodated coaxially with the introduction port, and an opening for introducing the transfer fluid is formed in a portion facing the introduction port of the front partition wall. The opening is introduced from the opening. An impeller for discharging the transferred fluid from the outer periphery;

A support member that supports the impeller rotatably and slidably in the direction of the rotation axis, and a rotation driving means that rotationally drives the impeller;

At least one of the inlet of the front partition and the opening of the impeller protrudes in a direction parallel to the rotation axis, and an annular clearance in the direction of the rotation axis is provided between the introduction of the front partition and the opening of the impeller. A backflow-preventing protrusion that covers non-contact from at least one of the inner and outer peripheral sides;

A self-priming pump characterized by comprising:

[2] The front partition has a liner ring at the introduction port,

The impeller has a mouth ring that is slidable in contact with the liner ring at the opening, and the backflow preventing protrusion has an annular gap between the liner ring and the mouth ring at least one of an inner peripheral side and an outer peripheral side. Is something that covers

The self-priming pump according to claim 1.

[3] A bottomed cylindrical rear partition wall that forms a cylindrical space communicating with the pump chamber on the rear side of the casing,

The support member includes a support shaft that protrudes from the rear bottom surface of the rear partition wall to the front side,

The rotation driving means is a driven rotating body provided integrally with the impeller and disposed in an annular space between the rear partition wall and the support shaft, and is rotatably supported by the support shaft, on the outer peripheral side of the rear partition wall A drive rotator disposed and magnetically coupled to the driven rotator; and a motor for rotationally driving the drive rotator. The self-priming pump according to claim 1 or 2, wherein

The casing is divided into a first tank chamber on the front side that can store priming water and a second tank chamber on the rear side,

The first tank chamber communicates with an inlet of the transfer fluid at an upper portion thereof and communicates with an inlet of the front partition at a lower portion thereof.

The second tank chamber communicates with the pump chamber and communicates with the transfer fluid discharge port at an upper portion thereof.

The self-priming pump according to any one of claims 1 to 3, wherein the self-priming pump is one.