JP2004332567A - Magnet pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnet pump wherein the rotating slide of an impeller is stabilized for a long period by preventing the mixture of foreign matters in a fluid enter a bearing of the impeller and permitting small foreign matters, if mixed and enter there once, to be discharged and the bearing of the impeller to be well cooled and lubricated. <P>SOLUTION: The magnet pump comprises a pump housing A, a bulkhead body 5 connected to the pump housing A, the impeller shaft 6 consisting of a large-diameter shaft portion 6a and a small-diameter shaft portion 6b and supported by the bulk head body 5 and the pump housing A, and an impeller rotor B having a large inner diameter portion 9a and a small inner diameter portion 9b consisting of a bearing hole 9 and an impeller vane portion 11 turnably and slidably jounaled to the impeller shaft 6. A cavity fluid sump portion s is formed by the small-diameter shaft portion 6a of the impeller shaft 6 and the large inner diameter portion 9a of the bearing hole 9 of the impeller rotor B. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention can prevent foreign matter in a fluid from being mixed into a bearing of an impeller, and can discharge even fine foreign matter once it has been mixed, thereby improving cooling and lubrication of the bearing of the impeller. The present invention relates to a magnet pump that can stably rotate and rotate an impeller for a long time.
[0002]
[Prior art]
Patent Document 1 (Japanese Patent Application Laid-Open No. 2001-165085) discloses a magnet pump in which a bearing is mounted on a driven rotating body of a magnet pump so as to be movable in an axial direction of a shaft supporting the driven rotating body. This is because the pressure fluid discharged from the impeller is introduced into the gap between the driven rotor and the rear casing, passes through the gap between the shaft and the bearing, circulates to the center of the impeller, and causes the sliding friction between the bearing and the shaft. Cools and lubricates heat. A spiral or spline-shaped flow groove is formed on the inner surface of the bearing so that an appropriate amount of pressure fluid flows.
[0003]
[Patent Document 1]
JP-A-2001-165085
[0004]
[Problems to be solved by the invention]
When a magnet pump is used as a cooling device for an internal combustion engine, the cooling fluid is filled in the cooling passage, so that the problem of the idling operation or the aeration operation, which has been cited as the prior art magnet pump, is solved. However, the cooling liquid circulating in the cooling passage is gradually mixed with foreign substances when used for a long period of time, and when the foreign substances enter the bearing provided between the impeller and the shaft, The sliding surface between the shaft and the bearing is likely to be worn by foreign matter, which may make smooth rotation difficult.
[0005]
Further, in Patent Document 1, since a flow groove is formed on the inner surface of the bearing and the pressure liquid is circulated between the shaft and the bearing, foreign matter in the pressure liquid easily enters the bearing sliding portion together with the pressure liquid. . Since the pressure fluid discharged from the impeller is circulated through the flow groove on the inner surface of the bearing provided between the shaft and the bearing, foreign matter mixed in the bearing easily enters together with the pressure fluid. At this time, not only minute foreign matters but also relatively large foreign matters can easily enter the flow grooves, so that foreign matters easily accumulate in the bearing.
[0006]
For this reason, the rotation of the shaft and the bearing and the sliding in the axial direction are hindered, and the shaft and the bearing are easily worn, which makes it difficult to perform a smooth rotation operation, and may lower the durability of the pump. Wear, particularly caused by large foreign objects, will significantly shorten the life of the pump. An object of the present invention is to prevent foreign matter from entering between the impeller shaft supporting the impeller and the impeller bearing portion as described above, and even if small foreign matter enters, quickly discharge them, and The purpose is to make the structure extremely simple.
[0007]
[Means for Solving the Problems]
The inventor of the present invention has conducted intensive studies to solve the above-mentioned problems. As a result, the present invention has found that the present invention provides a pump housing, a partition, and a large-diameter portion supported by the partition and the pump housing. An impeller shaft comprising a small-diameter portion, an impeller rotatably and slidably supported by the impeller shaft and having a large-diameter portion and a small-diameter portion, and an impeller comprising a blade. Prevents foreign matter from entering between the impeller shaft that supports the impeller and the impeller bearing by using a magnet pump with a gap formed by the small diameter portion of the impeller and the large inner diameter of the impeller bearing. In addition, even if small contaminants enter, these problems are solved by quickly discharging them and making the structure extremely simple.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, as shown in FIG. 1A, the configuration of the present invention includes a pump housing A, a partition 5 and a magnet cup body storage 16. The pump housing A and the magnet cup body housing 16 are joined together by fasteners such as bolts and nuts, and the inner chamber formed by the pump housing A and the magnet cup body housing 16 is formed by a partition wall 5. Be partitioned.
[0009]
As shown in FIG. 2, the pump housing A includes an impeller housing 1, a suction passage 2 and a discharge passage 3. The partition body 5 is joined to the impeller housing portion 1 in a watertight manner, thereby forming a gap for accommodating the impeller rotating body B, and this is an impeller for accommodating the inner magnet portion 7 of the impeller rotating body B. Room. An impeller rotating body B is rotatably housed in the impeller chamber via an impeller shaft 6.
[0010]
As valvular wall 5, as shown in FIG. 2, in which the partition wall side bearing portions 5b are formed in the partition bottom portion 5a ₁ of the cup-shaped portion 5a. Septum side bearing portions 5b, the partition wall bottom portion 5a ₁ and the rising portion of the circumferential shape is formed in the axial end of the impeller shaft 6 is rotatably supported on the partition wall side pivot support 5b. Although not particularly shown, the partition wall-side bearing portions 5b may be one that is formed as a hole-shaped recess in the central position of the partition wall bottom portion 5a _1.
[0011]
The suction passage 2 of the pump housing A is formed with a body-side shaft support 4. The main-body-side supporting portion 4 is configured such that the main-body-side supporting portion 4 and the partition-side-side supporting portion 5b of the partition body 5 are the same inside the pump housing A by joining the partition 5 to the pump housing A. , And both ends in the axial direction are supported such that the axis of the impeller shaft 6 coincides with the axis. The suction passage 2 has an appropriate inclination angle with respect to the axis of the impeller shaft 6 in a properly installed state, that is, the axis formed by the main body side support 4 and the partition wall side support 5b. The inclination is about 75 °.
[0012]
2, the impeller shaft 6 includes a large-diameter shaft portion 6a and a small-diameter shaft portion 6b, and a step 6c is formed between the large-diameter shaft portion 6a and the small-diameter shaft portion 6b. The stepped portion 6c is a substantially flat surface orthogonal to (including substantially orthogonal to) the axial direction of the impeller shaft 6. As shown in FIGS. 1A and 2, the impeller rotating body B includes an inner magnet portion 7 and an impeller blade portion 11, and a bearing portion is provided at the center of rotation of the inner magnet portion 7. 8 are formed.
[0013]
The bearing portion 8 has a bearing hole 9 as shown in FIG. 2, and the bearing hole 9 has a large inner diameter portion 9a and a small inner diameter portion 9b as shown in FIG. The bearing hole 9 of the impeller rotor B is supported by the impeller shaft 6, and the large-diameter portion 9a of the bearing hole 9 is supported by the large-diameter shaft portion 6a of the impeller shaft 6, and the small-diameter portion 9b is supported by the small diameter shaft portion 6b. In the bearing hole 9, a step portion between the large inner diameter portion 9a and the small inner diameter portion 9b is referred to as an inner diameter step portion 9c.
[0014]
When the impeller rotor B is supported by the impeller shaft 6, a gap surrounded by the large-diameter portion 9a, the small-diameter shaft portion 6b, the step portion 6c, and the internal-diameter step 9c is formed. Becomes the fluid reservoir s. The volume of the fluid reservoir s increases and decreases when the impeller rotor B moves along the axial direction of the impeller shaft 6. That is, as shown in FIG. 5 (A), when the impeller rotor B moves in the axial direction toward the outer magnet 15 so that the step 6c and the inner diameter step 9c are separated from each other, the fluid accumulation section The volume of s increases. As shown in FIG. 5B, when the impeller rotating body B moves in the axial direction toward the suction passage 2, the stepped portion 6c and the inner diameter stepped portion 9c move in the direction in which the impeller comes closer to each other. When the rotating body B moves in the axial direction, the volume of the fluid reservoir s decreases.
[0015]
The inner magnet section 7 has an inner magnet 7a mounted on the inner magnet cover section 7b. An impeller blade 11 is continuously formed in the inner magnet cover 7b so as to be adjacent in the axial direction, and the impeller blade 11 rotates together with the rotation of the inner magnet 7. The impeller blade portion 11 has a plurality of blade pieces 11a, 11a,..., And further has an annular portion 12 formed at the tip of the plurality of blade pieces 11a, 11a,. The shape part 13 is formed continuously. The cylindrical portion 13 is attached to the end of the suction passage 2 on the side of the impeller housing 1 in a loosely inserted state.
[0016]
When the impeller rotor B is stopped, the fluid reservoir s is located on the partition body 5 side by the outer magnet 15 and has a volume of an appropriate size. When the impeller rotor B rotates, the impeller rotor B moves toward the suction passage 2 due to the suction negative pressure and contracts as shown in FIGS. Since the impeller rotor B moves in the axial direction of the impeller shaft 6 every time the pump pressure changes due to a pump operation or a change in the number of revolutions, the volume of the fluid reservoir s decreases or increases. The size changes. When the operation of the pump is stopped, it returns to the initial position by the magnetic force of the outer magnet 15, and the volume of the fluid reservoir s increases. Fluid is introduced into the fluid reservoir s from a shaft gap between the bearing hole 9 of the impeller rotor B and the impeller shaft 6.
[0017]
The fluid in the fluid reservoir s cools and lubricates the frictional heat of the rotary sliding portion between the bearing hole 9 of the bearing portion 8 of the impeller rotor B and the impeller shaft 6. Since the impeller rotor B moves in the axial direction in response to a pump pressure change such as a change in pump operation or a change in the number of revolutions, the volume of the fluid reservoir s formed by the bearing hole 9 and the impeller shaft 6 is reduced. By expanding the fluid, the fluid in the fluid reservoir s can be positively discharged and sucked by the operation. The impeller rotating body B is applied with an acting force due to the suction negative pressure and the magnetic force of the outer magnet 15, and a reciprocating force that varies depending on the magnitude of the applied force is applied. In this manner, the water corresponding to the volume change can be replaced in the fluid reservoir s every time the start and stop are performed. Also, during operation, displacement in the thrust direction occurs in accordance with the rotation speed of the pump, and the lubrication of the bearing can be kept good.
[0018]
When the fluid to the fluid reservoir s is introduced from the gap between the bearing hole 9 and the impeller shaft 6, the intrusion of large foreign matter is prevented, and even if minute foreign matter enters, the fluid reservoir s can be removed. When the volume changes, it is driven out of the fluid reservoir s. As described above, the fluid in the fluid reservoir s is exchanged by discharging and suctioning by the axial movement of the impeller rotating body B, and the minute foreign matter that has entered the gap is discharged and deposited. Therefore, the structure is such that foreign matters are not easily accumulated.
[0019]
A stopper 6d is formed on the impeller shaft 6, as shown in FIG. The stopper portion 6d is a portion that comes into contact with the axial end of the bearing portion 8 of the impeller rotor B. Distance k between the axial end portion of the impeller rotating member B in this stopper portion 6d and the initial state is set smaller than the maximum length s ₁ at the maximum volume of the fluid reservoir unit s, the s _{1> k} .
[0020]
When the impeller rotating body B moves in the axial direction and comes into contact with the stopper 6d, the fluid reservoir s maintains the minimum gap between the step 6c and the inner diameter step 9c at all times to secure the minimum gap. can do. Further, it is possible to prevent the displacement of the inner magnet portion 7 on the impeller rotating body B side from becoming large with respect to the position of the outer magnet 15, and to keep the inner magnet portion 7 within a range where the outer magnet 15 and the outer magnet 15 mutually exert magnetic force. Therefore, the impeller rotor B can receive the magnetic force rotation transmission from the outer magnet 15 satisfactorily.
[0021]
Next, an annular portion 12 that covers the tip of the impeller blade portion 11 of the impeller rotating body B is provided. The annular portion 12 is formed at the tip of each of the blade pieces 11a, 11a,. Further, a cylindrical portion 13 is formed from the inner peripheral edge of the annular portion 12. The cylindrical portion 13 is a portion for introducing a fluid from the suction passage 2 to the impeller, and is provided so as to protrude from an opening of the suction passage 2 on the side of the impeller housing 1. The opening is formed in a flare shape.
[0022]
A small gap is formed between the periphery of the opening of the suction passage 2 of the pump housing A and the outer periphery of the annular portion 12 and the inner peripheral edge of the opening of the suction passage 2. Then, fluid is efficiently introduced from the cylindrical portion 13 toward the impeller housing portion 1, and a part of the fluid enters the gap between the bearing hole 9 and the impeller shaft 6 from behind the inner magnet portion 7. Has become. The outer diameter of the cylindrical portion 13 is set so that the gap between the cylindrical portion 13 and the suction passage 2 is constant in the axial direction of the impeller, so that the negative pressure from the impeller housing portion 1 at a positive pressure is reduced. It is possible to suppress the recirculation of the fluid to the suction path 2 of the pressure and prevent the performance from deteriorating.
[0023]
Next, the magnet cup body housing section 16 is connected to the pump housing A by a fixing tool such as a bolt or a nut to constitute a pump together with the pump housing A. An outer magnet 15 is rotatably mounted inside the magnet cup body storage section 16. Specifically, as shown in FIG. 1 (A), the drive shaft 17 is mounted on the magnet cup housing 16 so as to penetrate through the inside and the outside of the magnet cup housing 16 via a bearing. The drive shaft 17 is connected to the outer magnet 15 inside the magnet cup housing 16. Further, the rotational motion is transmitted to the drive shaft 17 outside the magnet cup body housing portion 16 via a pulley or a chain sprocket (not shown).
[0024]
Next, the operation in the embodiment of the present invention will be described. First, in the stopped state, as shown in FIGS. 3A, 3B and 5A, the impeller rotating body B is closer to the partition wall 5 as an initial position. When the impeller rotating body B starts rotating by the rotation transmission of the outer magnet 15, a suction negative pressure is first generated, and as shown in FIGS. 4 (A), (B) and 5 (B), the impeller rotation is started. The body B is moved toward the suction passage 2 along the impeller shaft 6, and the impeller rotating body B moves toward the stopper portion 6d.
[0025]
Then, the end of the bearing portion 8 of the impeller rotating body B near the suction passage 2 contacts the stopper portion 6d, so that the fluid reservoir s has a minimum volume, and is stored in the fluid reservoir s at the maximum volume. The discharged fluid is discharged. Here, the fluid reservoir s has a minimum volume, and since a fluid exists inside the fluid reservoir s, lubrication and cooling of a bearing portion between the impeller rotor B and the impeller shaft 6 are performed. When the rotor is stopped, the impeller rotor B moves to the original outer magnet 15 side (initial position) by the magnetic force of the outer magnet 15, and the volume of the fluid reservoir s becomes maximum, and the fluid is introduced into the fluid reservoir s. Is done. This always moves according to the rotation change due to the balance between the propulsive force applied to the impeller rotor B as a reaction force of the pump protrusion pressure during operation and the restoring force due to the magnetic force of the outer magnet 15.
[0026]
Note that by increasing the axial length of the inner magnet portion 7 with respect to the axial length of the outer magnet 15, the inner magnet portion 7 moves in the axial direction even when the impeller rotating body B moves by the axial movement. The outer magnet 15 does not largely deviate from the fixed outer magnet 15 and exerts a sufficient magnetic force on each other, so that a sufficient rotation of the magnetic force can always be transmitted.
[0027]
【The invention's effect】
The invention of claim 1 comprises a pump housing A, a partition wall 5 connected to the pump housing A, a large-diameter shaft portion 6a and a small-diameter shaft portion 6b, and is supported by the partition wall 5 and the pump housing A. Rotor B having an impeller shaft 6, a large bore 9 a and a small bore 9 b, and a bearing hole 9 rotatably and slidably supported by the impeller shaft 6 and an impeller blade 11. The impeller is constituted by a magnet pump in which a fluid reservoir s is formed in the air gap formed by the small-diameter shaft portion 6b of the impeller shaft 6 and the large-diameter portion 9a of the bearing hole 9 of the impeller rotor B. While introducing fluid between the rotating body B and the impeller shaft 6, the bearing of the impeller is cooled and lubricated, and even if minute foreign matter is mixed in, it can be discharged. Stabilizes rotational sliding It is possible.
[0028]
To describe the above effects in detail, the impeller shaft 6 includes a large-diameter shaft portion 6a and a small-diameter shaft portion 6b, and the bearing portion 9 of the impeller rotor B has a large-diameter portion 9a and a small-diameter portion 9b. I have. When the bearing portion 9 is supported by the impeller shaft 6, a fluid reservoir s having a gap formed by the small-diameter shaft portion 6b and the large-diameter portion 9a is formed. In the fluid reservoir s, the impeller rotor B is movable in both directions along the axial direction of the impeller shaft 6. Each time the impeller rotor B moves in the axial direction, the volume of the fluid reservoir s increases or decreases.
[0029]
Thus, when the pump starts, the impeller rotor B moves toward the suction passage 2 due to the negative pressure of the pump suction, the volume of the fluid reservoir s decreases, and the fluid stored inside the impeller rotor s flows from the fluid reservoir s through the impeller. It is discharged outside the shaft 6. When the pump is stopped, the impeller rotating body B returns to the initial position, that is, the inside of the partition wall 5 due to the magnetic force of the outer magnet 15. At this time, the volume of the fluid reservoir s increases, and the fluid is sucked into the fluid reservoir s. At the next start, the fluid reservoir s can be in a state where the fluid is sufficiently accumulated.
[0030]
According to a second aspect of the present invention, in the first aspect, the impeller shaft 6 is provided with a stopper 6d with which the impeller rotating body B contacts, and the distance k between the end of the bearing hole 9 and the stopper 6d is a maximum. By using a magnet pump that is smaller than the axial length of the fluid reservoir s in the volume state, the fluid reservoir s can always secure a minimum gap, and the fluid reservoir s is kept in operation during operation. It can be in a state where fluid is accumulated.
[0031]
That is, since the distance k between the end of the bearing hole 9 and the stopper 6d is smaller than the axial length of the fluid reservoir s in the maximum capacity state, the distance between the end of the bearing hole 9 and the stopper 6d is small. Even when the impeller is in contact, the fluid can be stored in the fluid reservoir s in a small volume, but the fluid is lubricated and cooled by the fluid when the impeller rotor B is rotating. is there. Further, the inner magnet portion 7 on the impeller rotating body B side does not largely displace from the position of the outer magnet 15, and can be held within a range where the magnetic force can reach each other. Can be kept good.
[0032]
According to a third aspect of the present invention, in the first or second aspect, an annular portion 12 formed at a tip of a blade portion of the impeller and a cylindrical portion 13 formed from an inner periphery of the annular portion 12 are formed. Reference numeral 13 denotes a magnet pump loosely inserted into the suction passage 2 of the pump housing A, so that the impeller having the annular portion 12 and the cylindrical portion 13 moves in the axial direction, and the inner circumference of the opening of the suction passage 2 The cylindrical portion 13 is in a loosely inserted state, and the inner periphery of the opening of the suction passage 2 and the outer periphery of the cylindrical portion 13 are connected. Therefore, the cylindrical portion 13 functions as a suction introduction passage for introducing the fluid from the suction passage 2 into the impeller blade 11. Therefore, the fluid can be efficiently introduced into the impeller, and the pump performance can be improved.
[Brief description of the drawings]
1A is a longitudinal side view of the present invention, FIG. 1B is a longitudinal sectional side view of a main part of the present invention, FIG. 2 is an exploded sectional view of a main member of the present invention, FIG. FIG. 4 (A) is an enlarged view of a main part of FIG. 4 (A). FIG. 4 (A) is a vertical cross-sectional view of the present invention in which the pump is in operation. FIG. 5A is an enlarged vertical sectional side view of a main part in a stopped state, and FIG. 5B is an enlarged vertical sectional side view of a main part in an operating state.
A: Pump housing B: Impeller rotating body 5: Partition body 6: Impeller shaft 6a: Large-diameter shaft 6b: Small-diameter shaft 6d: Stopper 9a: Large-diameter portion 9b: Small-diameter portion s: Fluid reservoir 11: Impeller Blade 12: annular portion 13: cylindrical portion

Claims (3)

A pump housing, a partition connected to the pump housing, an impeller shaft composed of a large-diameter shaft portion and a small-diameter shaft portion and supported by the partition and the pump housing, a large-diameter portion and a small-diameter portion. An impeller rotating body comprising a bearing hole rotatably and slidably supported by the impeller shaft and an impeller blade, and a small-diameter shaft portion of the impeller shaft and a large bearing hole of the impeller rotating body. A magnet pump characterized in that a fluid reservoir of an air gap consisting of an inner diameter portion is formed. 2. The impeller shaft according to claim 1, wherein the impeller shaft has a stopper portion with which the impeller rotating body contacts, and a distance between an end of the bearing hole and the stopper portion is smaller than an axial length of the fluid reservoir in a maximum volume state. A magnet pump characterized by being made. 3. The pump housing according to claim 1, wherein an annular portion is formed at a tip of the impeller blade portion, and a cylindrical portion is formed from an inner peripheral edge of the annular portion toward the suction passage. 3. A magnet pump characterized by being loosely inserted in a suction passage.

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